8342 lines
212 KiB
C
8342 lines
212 KiB
C
/* $OpenBSD: pf.c,v 1.1196 2024/05/14 08:26:13 jsg Exp $ */
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/*
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* Copyright (c) 2001 Daniel Hartmeier
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* Copyright (c) 2002 - 2013 Henning Brauer <henning@openbsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* Effort sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F30602-01-2-0537.
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*
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*/
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#include "bpfilter.h"
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#include "carp.h"
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#include "pflog.h"
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#include "pfsync.h"
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#include "pflow.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/filio.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/kernel.h>
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#include <sys/time.h>
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#include <sys/pool.h>
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#include <sys/proc.h>
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#include <sys/rwlock.h>
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#include <sys/syslog.h>
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#include <crypto/sha2.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_types.h>
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#include <net/route.h>
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#include <net/toeplitz.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/in_pcb.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/icmp_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_seq.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#include <netinet/tcp_fsm.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include <netinet/ip_divert.h>
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#ifdef INET6
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#include <netinet6/in6_var.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet/icmp6.h>
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#include <netinet6/nd6.h>
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#include <netinet6/ip6_divert.h>
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#endif /* INET6 */
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#include <net/pfvar.h>
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#include <net/pfvar_priv.h>
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#if NPFLOG > 0
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#include <net/if_pflog.h>
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#endif /* NPFLOG > 0 */
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#if NPFLOW > 0
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#include <net/if_pflow.h>
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#endif /* NPFLOW > 0 */
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#if NPFSYNC > 0
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#include <net/if_pfsync.h>
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#endif /* NPFSYNC > 0 */
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/*
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* Global variables
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*/
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struct pf_state_tree pf_statetbl;
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struct pf_queuehead pf_queues[2];
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struct pf_queuehead *pf_queues_active;
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struct pf_queuehead *pf_queues_inactive;
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struct pf_status pf_status;
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struct mutex pf_inp_mtx = MUTEX_INITIALIZER(IPL_SOFTNET);
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int pf_hdr_limit = 20; /* arbitrary limit, tune in ddb */
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SHA2_CTX pf_tcp_secret_ctx;
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u_char pf_tcp_secret[16];
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int pf_tcp_secret_init;
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int pf_tcp_iss_off;
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enum pf_test_status {
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PF_TEST_FAIL = -1,
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PF_TEST_OK,
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PF_TEST_QUICK
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};
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struct pf_test_ctx {
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struct pf_pdesc *pd;
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struct pf_rule_actions act;
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u_int8_t icmpcode;
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u_int8_t icmptype;
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int icmp_dir;
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int state_icmp;
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int tag;
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u_short reason;
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struct pf_rule_item *ri;
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struct pf_src_node *sns[PF_SN_MAX];
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struct pf_rule_slist rules;
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struct pf_rule *nr;
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struct pf_rule **rm;
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struct pf_rule *a;
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struct pf_rule **am;
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struct pf_ruleset **rsm;
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struct pf_ruleset *arsm;
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struct pf_ruleset *aruleset;
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struct tcphdr *th;
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};
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struct pool pf_src_tree_pl, pf_rule_pl, pf_queue_pl;
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struct pool pf_state_pl, pf_state_key_pl, pf_state_item_pl;
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struct pool pf_rule_item_pl, pf_sn_item_pl, pf_pktdelay_pl;
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void pf_add_threshold(struct pf_threshold *);
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int pf_check_threshold(struct pf_threshold *);
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int pf_check_tcp_cksum(struct mbuf *, int, int,
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sa_family_t);
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__inline void pf_cksum_fixup(u_int16_t *, u_int16_t, u_int16_t,
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u_int8_t);
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void pf_cksum_fixup_a(u_int16_t *, const struct pf_addr *,
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const struct pf_addr *, sa_family_t, u_int8_t);
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int pf_modulate_sack(struct pf_pdesc *,
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struct pf_state_peer *);
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int pf_icmp_mapping(struct pf_pdesc *, u_int8_t, int *,
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u_int16_t *, u_int16_t *);
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int pf_change_icmp_af(struct mbuf *, int,
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struct pf_pdesc *, struct pf_pdesc *,
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struct pf_addr *, struct pf_addr *, sa_family_t,
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sa_family_t);
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int pf_translate_a(struct pf_pdesc *, struct pf_addr *,
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struct pf_addr *);
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void pf_translate_icmp(struct pf_pdesc *, struct pf_addr *,
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u_int16_t *, struct pf_addr *, struct pf_addr *,
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u_int16_t);
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int pf_translate_icmp_af(struct pf_pdesc*, int, void *);
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void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, int,
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sa_family_t, struct pf_rule *, u_int);
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void pf_detach_state(struct pf_state *);
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struct pf_state_key *pf_state_key_attach(struct pf_state_key *,
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struct pf_state *, int);
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void pf_state_key_detach(struct pf_state *, int);
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u_int32_t pf_tcp_iss(struct pf_pdesc *);
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void pf_rule_to_actions(struct pf_rule *,
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struct pf_rule_actions *);
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int pf_test_rule(struct pf_pdesc *, struct pf_rule **,
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struct pf_state **, struct pf_rule **,
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struct pf_ruleset **, u_short *);
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static __inline int pf_create_state(struct pf_pdesc *, struct pf_rule *,
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struct pf_rule *, struct pf_rule *,
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struct pf_state_key **, struct pf_state_key **,
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int *, struct pf_state **, int,
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struct pf_rule_slist *, struct pf_rule_actions *,
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struct pf_src_node **);
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static __inline int pf_state_key_addr_setup(struct pf_pdesc *, void *,
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int, struct pf_addr *, int, struct pf_addr *,
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int, int);
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int pf_state_key_setup(struct pf_pdesc *, struct
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pf_state_key **, struct pf_state_key **, int);
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int pf_tcp_track_full(struct pf_pdesc *,
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struct pf_state **, u_short *, int *, int);
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int pf_tcp_track_sloppy(struct pf_pdesc *,
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struct pf_state **, u_short *);
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static __inline int pf_synproxy(struct pf_pdesc *, struct pf_state **,
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u_short *);
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int pf_test_state(struct pf_pdesc *, struct pf_state **,
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u_short *);
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int pf_icmp_state_lookup(struct pf_pdesc *,
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struct pf_state_key_cmp *, struct pf_state **,
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u_int16_t, u_int16_t, int, int *, int, int);
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int pf_test_state_icmp(struct pf_pdesc *,
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struct pf_state **, u_short *);
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u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, int,
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u_int16_t);
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static __inline int pf_set_rt_ifp(struct pf_state *, struct pf_addr *,
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sa_family_t, struct pf_src_node **);
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struct pf_divert *pf_get_divert(struct mbuf *);
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int pf_walk_option(struct pf_pdesc *, struct ip *,
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int, int, u_short *);
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int pf_walk_header(struct pf_pdesc *, struct ip *,
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u_short *);
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int pf_walk_option6(struct pf_pdesc *, struct ip6_hdr *,
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int, int, u_short *);
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int pf_walk_header6(struct pf_pdesc *, struct ip6_hdr *,
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u_short *);
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void pf_print_state_parts(struct pf_state *,
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struct pf_state_key *, struct pf_state_key *);
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int pf_addr_wrap_neq(struct pf_addr_wrap *,
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struct pf_addr_wrap *);
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int pf_compare_state_keys(struct pf_state_key *,
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struct pf_state_key *, struct pfi_kif *, u_int);
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u_int16_t pf_pkt_hash(sa_family_t, uint8_t,
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const struct pf_addr *, const struct pf_addr *,
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uint16_t, uint16_t);
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int pf_find_state(struct pf_pdesc *,
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struct pf_state_key_cmp *, struct pf_state **);
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int pf_src_connlimit(struct pf_state **);
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int pf_match_rcvif(struct mbuf *, struct pf_rule *);
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enum pf_test_status pf_match_rule(struct pf_test_ctx *,
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struct pf_ruleset *);
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void pf_counters_inc(int, struct pf_pdesc *,
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struct pf_state *, struct pf_rule *,
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struct pf_rule *);
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int pf_state_insert(struct pfi_kif *,
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struct pf_state_key **, struct pf_state_key **,
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struct pf_state *);
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int pf_state_key_isvalid(struct pf_state_key *);
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struct pf_state_key *pf_state_key_ref(struct pf_state_key *);
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void pf_state_key_unref(struct pf_state_key *);
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void pf_state_key_link_reverse(struct pf_state_key *,
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struct pf_state_key *);
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void pf_state_key_unlink_reverse(struct pf_state_key *);
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void pf_state_key_link_inpcb(struct pf_state_key *,
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struct inpcb *);
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void pf_state_key_unlink_inpcb(struct pf_state_key *);
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void pf_pktenqueue_delayed(void *);
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int32_t pf_state_expires(const struct pf_state *, uint8_t);
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#if NPFLOG > 0
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void pf_log_matches(struct pf_pdesc *, struct pf_rule *,
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struct pf_rule *, struct pf_ruleset *,
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struct pf_rule_slist *);
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#endif /* NPFLOG > 0 */
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extern struct pool pfr_ktable_pl;
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extern struct pool pfr_kentry_pl;
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struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = {
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{ &pf_state_pl, PFSTATE_HIWAT, PFSTATE_HIWAT },
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{ &pf_src_tree_pl, PFSNODE_HIWAT, PFSNODE_HIWAT },
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{ &pf_frent_pl, PFFRAG_FRENT_HIWAT, PFFRAG_FRENT_HIWAT },
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{ &pfr_ktable_pl, PFR_KTABLE_HIWAT, PFR_KTABLE_HIWAT },
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{ &pfr_kentry_pl, PFR_KENTRY_HIWAT, PFR_KENTRY_HIWAT },
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{ &pf_pktdelay_pl, PF_PKTDELAY_MAXPKTS, PF_PKTDELAY_MAXPKTS },
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{ &pf_anchor_pl, PF_ANCHOR_HIWAT, PF_ANCHOR_HIWAT }
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};
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#define BOUND_IFACE(r, k) \
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((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all
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#define STATE_INC_COUNTERS(s) \
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do { \
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struct pf_rule_item *mrm; \
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s->rule.ptr->states_cur++; \
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s->rule.ptr->states_tot++; \
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if (s->anchor.ptr != NULL) { \
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s->anchor.ptr->states_cur++; \
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s->anchor.ptr->states_tot++; \
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} \
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SLIST_FOREACH(mrm, &s->match_rules, entry) \
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mrm->r->states_cur++; \
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} while (0)
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static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
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static inline int pf_state_compare_key(const struct pf_state_key *,
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const struct pf_state_key *);
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static inline int pf_state_compare_id(const struct pf_state *,
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const struct pf_state *);
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#ifdef INET6
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static __inline void pf_cksum_uncover(u_int16_t *, u_int16_t, u_int8_t);
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static __inline void pf_cksum_cover(u_int16_t *, u_int16_t, u_int8_t);
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#endif /* INET6 */
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static __inline void pf_set_protostate(struct pf_state *, int, u_int8_t);
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struct pf_src_tree tree_src_tracking;
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struct pf_state_tree_id tree_id;
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struct pf_state_list pf_state_list = PF_STATE_LIST_INITIALIZER(pf_state_list);
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RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
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RBT_GENERATE(pf_state_tree, pf_state_key, sk_entry, pf_state_compare_key);
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RBT_GENERATE(pf_state_tree_id, pf_state, entry_id, pf_state_compare_id);
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int
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pf_addr_compare(const struct pf_addr *a, const struct pf_addr *b,
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sa_family_t af)
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{
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switch (af) {
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case AF_INET:
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if (a->addr32[0] > b->addr32[0])
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return (1);
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if (a->addr32[0] < b->addr32[0])
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return (-1);
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break;
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#ifdef INET6
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case AF_INET6:
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if (a->addr32[3] > b->addr32[3])
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return (1);
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if (a->addr32[3] < b->addr32[3])
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return (-1);
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if (a->addr32[2] > b->addr32[2])
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return (1);
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if (a->addr32[2] < b->addr32[2])
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return (-1);
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if (a->addr32[1] > b->addr32[1])
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return (1);
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if (a->addr32[1] < b->addr32[1])
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return (-1);
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if (a->addr32[0] > b->addr32[0])
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return (1);
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if (a->addr32[0] < b->addr32[0])
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return (-1);
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break;
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#endif /* INET6 */
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}
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return (0);
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}
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static __inline int
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pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
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{
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int diff;
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if (a->rule.ptr > b->rule.ptr)
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return (1);
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if (a->rule.ptr < b->rule.ptr)
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return (-1);
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if ((diff = a->type - b->type) != 0)
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return (diff);
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if ((diff = a->af - b->af) != 0)
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return (diff);
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if ((diff = pf_addr_compare(&a->addr, &b->addr, a->af)) != 0)
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return (diff);
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return (0);
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}
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static __inline void
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pf_set_protostate(struct pf_state *st, int which, u_int8_t newstate)
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{
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if (which == PF_PEER_DST || which == PF_PEER_BOTH)
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st->dst.state = newstate;
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if (which == PF_PEER_DST)
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return;
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if (st->src.state == newstate)
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return;
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if (st->creatorid == pf_status.hostid &&
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st->key[PF_SK_STACK]->proto == IPPROTO_TCP &&
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!(TCPS_HAVEESTABLISHED(st->src.state) ||
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st->src.state == TCPS_CLOSED) &&
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(TCPS_HAVEESTABLISHED(newstate) || newstate == TCPS_CLOSED))
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pf_status.states_halfopen--;
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st->src.state = newstate;
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}
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void
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pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
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{
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switch (af) {
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case AF_INET:
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dst->addr32[0] = src->addr32[0];
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break;
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#ifdef INET6
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case AF_INET6:
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dst->addr32[0] = src->addr32[0];
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dst->addr32[1] = src->addr32[1];
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dst->addr32[2] = src->addr32[2];
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dst->addr32[3] = src->addr32[3];
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break;
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#endif /* INET6 */
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default:
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unhandled_af(af);
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}
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}
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void
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pf_init_threshold(struct pf_threshold *threshold,
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u_int32_t limit, u_int32_t seconds)
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{
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threshold->limit = limit * PF_THRESHOLD_MULT;
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threshold->seconds = seconds;
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threshold->count = 0;
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threshold->last = getuptime();
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}
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void
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pf_add_threshold(struct pf_threshold *threshold)
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{
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u_int32_t t = getuptime(), diff = t - threshold->last;
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if (diff >= threshold->seconds)
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threshold->count = 0;
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else
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threshold->count -= threshold->count * diff /
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threshold->seconds;
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threshold->count += PF_THRESHOLD_MULT;
|
|
threshold->last = t;
|
|
}
|
|
|
|
int
|
|
pf_check_threshold(struct pf_threshold *threshold)
|
|
{
|
|
return (threshold->count > threshold->limit);
|
|
}
|
|
|
|
void
|
|
pf_state_list_insert(struct pf_state_list *pfs, struct pf_state *st)
|
|
{
|
|
/*
|
|
* we can always put states on the end of the list.
|
|
*
|
|
* things reading the list should take a read lock, then
|
|
* the mutex, get the head and tail pointers, release the
|
|
* mutex, and then they can iterate between the head and tail.
|
|
*/
|
|
|
|
pf_state_ref(st); /* get a ref for the list */
|
|
|
|
mtx_enter(&pfs->pfs_mtx);
|
|
TAILQ_INSERT_TAIL(&pfs->pfs_list, st, entry_list);
|
|
mtx_leave(&pfs->pfs_mtx);
|
|
}
|
|
|
|
void
|
|
pf_state_list_remove(struct pf_state_list *pfs, struct pf_state *st)
|
|
{
|
|
/* states can only be removed when the write lock is held */
|
|
rw_assert_wrlock(&pfs->pfs_rwl);
|
|
|
|
mtx_enter(&pfs->pfs_mtx);
|
|
TAILQ_REMOVE(&pfs->pfs_list, st, entry_list);
|
|
mtx_leave(&pfs->pfs_mtx);
|
|
|
|
pf_state_unref(st); /* list no longer references the state */
|
|
}
|
|
|
|
void
|
|
pf_update_state_timeout(struct pf_state *st, int to)
|
|
{
|
|
mtx_enter(&st->mtx);
|
|
if (st->timeout != PFTM_UNLINKED)
|
|
st->timeout = to;
|
|
mtx_leave(&st->mtx);
|
|
}
|
|
|
|
int
|
|
pf_src_connlimit(struct pf_state **stp)
|
|
{
|
|
int bad = 0;
|
|
struct pf_src_node *sn;
|
|
|
|
if ((sn = pf_get_src_node((*stp), PF_SN_NONE)) == NULL)
|
|
return (0);
|
|
|
|
sn->conn++;
|
|
(*stp)->src.tcp_est = 1;
|
|
pf_add_threshold(&sn->conn_rate);
|
|
|
|
if ((*stp)->rule.ptr->max_src_conn &&
|
|
(*stp)->rule.ptr->max_src_conn < sn->conn) {
|
|
pf_status.lcounters[LCNT_SRCCONN]++;
|
|
bad++;
|
|
}
|
|
|
|
if ((*stp)->rule.ptr->max_src_conn_rate.limit &&
|
|
pf_check_threshold(&sn->conn_rate)) {
|
|
pf_status.lcounters[LCNT_SRCCONNRATE]++;
|
|
bad++;
|
|
}
|
|
|
|
if (!bad)
|
|
return (0);
|
|
|
|
if ((*stp)->rule.ptr->overload_tbl) {
|
|
struct pfr_addr p;
|
|
u_int32_t killed = 0;
|
|
|
|
pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
|
|
if (pf_status.debug >= LOG_NOTICE) {
|
|
log(LOG_NOTICE,
|
|
"pf: pf_src_connlimit: blocking address ");
|
|
pf_print_host(&sn->addr, 0,
|
|
(*stp)->key[PF_SK_WIRE]->af);
|
|
}
|
|
|
|
memset(&p, 0, sizeof(p));
|
|
p.pfra_af = (*stp)->key[PF_SK_WIRE]->af;
|
|
switch ((*stp)->key[PF_SK_WIRE]->af) {
|
|
case AF_INET:
|
|
p.pfra_net = 32;
|
|
p.pfra_ip4addr = sn->addr.v4;
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
p.pfra_net = 128;
|
|
p.pfra_ip6addr = sn->addr.v6;
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
|
|
pfr_insert_kentry((*stp)->rule.ptr->overload_tbl,
|
|
&p, gettime());
|
|
|
|
/* kill existing states if that's required. */
|
|
if ((*stp)->rule.ptr->flush) {
|
|
struct pf_state_key *sk;
|
|
struct pf_state *st;
|
|
|
|
pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;
|
|
RBT_FOREACH(st, pf_state_tree_id, &tree_id) {
|
|
sk = st->key[PF_SK_WIRE];
|
|
/*
|
|
* Kill states from this source. (Only those
|
|
* from the same rule if PF_FLUSH_GLOBAL is not
|
|
* set)
|
|
*/
|
|
if (sk->af ==
|
|
(*stp)->key[PF_SK_WIRE]->af &&
|
|
(((*stp)->direction == PF_OUT &&
|
|
PF_AEQ(&sn->addr, &sk->addr[1], sk->af)) ||
|
|
((*stp)->direction == PF_IN &&
|
|
PF_AEQ(&sn->addr, &sk->addr[0], sk->af))) &&
|
|
((*stp)->rule.ptr->flush &
|
|
PF_FLUSH_GLOBAL ||
|
|
(*stp)->rule.ptr == st->rule.ptr)) {
|
|
pf_update_state_timeout(st, PFTM_PURGE);
|
|
pf_set_protostate(st, PF_PEER_BOTH,
|
|
TCPS_CLOSED);
|
|
killed++;
|
|
}
|
|
}
|
|
if (pf_status.debug >= LOG_NOTICE)
|
|
addlog(", %u states killed", killed);
|
|
}
|
|
if (pf_status.debug >= LOG_NOTICE)
|
|
addlog("\n");
|
|
}
|
|
|
|
/* kill this state */
|
|
pf_update_state_timeout(*stp, PFTM_PURGE);
|
|
pf_set_protostate(*stp, PF_PEER_BOTH, TCPS_CLOSED);
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
|
|
enum pf_sn_types type, sa_family_t af, struct pf_addr *src,
|
|
struct pf_addr *raddr, struct pfi_kif *kif)
|
|
{
|
|
struct pf_src_node k;
|
|
|
|
if (*sn == NULL) {
|
|
k.af = af;
|
|
k.type = type;
|
|
pf_addrcpy(&k.addr, src, af);
|
|
k.rule.ptr = rule;
|
|
pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
|
|
*sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
|
|
}
|
|
if (*sn == NULL) {
|
|
if (!rule->max_src_nodes ||
|
|
rule->src_nodes < rule->max_src_nodes)
|
|
(*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT | PR_ZERO);
|
|
else
|
|
pf_status.lcounters[LCNT_SRCNODES]++;
|
|
if ((*sn) == NULL)
|
|
return (-1);
|
|
|
|
pf_init_threshold(&(*sn)->conn_rate,
|
|
rule->max_src_conn_rate.limit,
|
|
rule->max_src_conn_rate.seconds);
|
|
|
|
(*sn)->type = type;
|
|
(*sn)->af = af;
|
|
(*sn)->rule.ptr = rule;
|
|
pf_addrcpy(&(*sn)->addr, src, af);
|
|
if (raddr)
|
|
pf_addrcpy(&(*sn)->raddr, raddr, af);
|
|
if (RB_INSERT(pf_src_tree,
|
|
&tree_src_tracking, *sn) != NULL) {
|
|
if (pf_status.debug >= LOG_NOTICE) {
|
|
log(LOG_NOTICE,
|
|
"pf: src_tree insert failed: ");
|
|
pf_print_host(&(*sn)->addr, 0, af);
|
|
addlog("\n");
|
|
}
|
|
pool_put(&pf_src_tree_pl, *sn);
|
|
return (-1);
|
|
}
|
|
(*sn)->creation = getuptime();
|
|
(*sn)->rule.ptr->src_nodes++;
|
|
if (kif != NULL) {
|
|
(*sn)->kif = kif;
|
|
pfi_kif_ref(kif, PFI_KIF_REF_SRCNODE);
|
|
}
|
|
pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
|
|
pf_status.src_nodes++;
|
|
} else {
|
|
if (rule->max_src_states &&
|
|
(*sn)->states >= rule->max_src_states) {
|
|
pf_status.lcounters[LCNT_SRCSTATES]++;
|
|
return (-1);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
pf_remove_src_node(struct pf_src_node *sn)
|
|
{
|
|
if (sn->states > 0 || sn->expire > getuptime())
|
|
return;
|
|
|
|
sn->rule.ptr->src_nodes--;
|
|
if (sn->rule.ptr->states_cur == 0 &&
|
|
sn->rule.ptr->src_nodes == 0)
|
|
pf_rm_rule(NULL, sn->rule.ptr);
|
|
RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
|
|
pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
|
|
pf_status.src_nodes--;
|
|
pfi_kif_unref(sn->kif, PFI_KIF_REF_SRCNODE);
|
|
pool_put(&pf_src_tree_pl, sn);
|
|
}
|
|
|
|
struct pf_src_node *
|
|
pf_get_src_node(struct pf_state *st, enum pf_sn_types type)
|
|
{
|
|
struct pf_sn_item *sni;
|
|
|
|
SLIST_FOREACH(sni, &st->src_nodes, next)
|
|
if (sni->sn->type == type)
|
|
return (sni->sn);
|
|
return (NULL);
|
|
}
|
|
|
|
void
|
|
pf_state_rm_src_node(struct pf_state *st, struct pf_src_node *sn)
|
|
{
|
|
struct pf_sn_item *sni, *snin, *snip = NULL;
|
|
|
|
for (sni = SLIST_FIRST(&st->src_nodes); sni; sni = snin) {
|
|
snin = SLIST_NEXT(sni, next);
|
|
if (sni->sn == sn) {
|
|
if (snip)
|
|
SLIST_REMOVE_AFTER(snip, next);
|
|
else
|
|
SLIST_REMOVE_HEAD(&st->src_nodes, next);
|
|
pool_put(&pf_sn_item_pl, sni);
|
|
sni = NULL;
|
|
sn->states--;
|
|
}
|
|
if (sni != NULL)
|
|
snip = sni;
|
|
}
|
|
}
|
|
|
|
/* state table stuff */
|
|
|
|
static inline int
|
|
pf_state_compare_key(const struct pf_state_key *a,
|
|
const struct pf_state_key *b)
|
|
{
|
|
int diff;
|
|
|
|
if ((diff = a->hash - b->hash) != 0)
|
|
return (diff);
|
|
if ((diff = a->proto - b->proto) != 0)
|
|
return (diff);
|
|
if ((diff = a->af - b->af) != 0)
|
|
return (diff);
|
|
if ((diff = pf_addr_compare(&a->addr[0], &b->addr[0], a->af)) != 0)
|
|
return (diff);
|
|
if ((diff = pf_addr_compare(&a->addr[1], &b->addr[1], a->af)) != 0)
|
|
return (diff);
|
|
if ((diff = a->port[0] - b->port[0]) != 0)
|
|
return (diff);
|
|
if ((diff = a->port[1] - b->port[1]) != 0)
|
|
return (diff);
|
|
if ((diff = a->rdomain - b->rdomain) != 0)
|
|
return (diff);
|
|
return (0);
|
|
}
|
|
|
|
static inline int
|
|
pf_state_compare_id(const struct pf_state *a, const struct pf_state *b)
|
|
{
|
|
if (a->id > b->id)
|
|
return (1);
|
|
if (a->id < b->id)
|
|
return (-1);
|
|
if (a->creatorid > b->creatorid)
|
|
return (1);
|
|
if (a->creatorid < b->creatorid)
|
|
return (-1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* on failure, pf_state_key_attach() releases the pf_state_key
|
|
* reference and returns NULL.
|
|
*/
|
|
struct pf_state_key *
|
|
pf_state_key_attach(struct pf_state_key *sk, struct pf_state *st, int idx)
|
|
{
|
|
struct pf_state_item *si;
|
|
struct pf_state_key *cur;
|
|
struct pf_state *oldst = NULL;
|
|
|
|
PF_ASSERT_LOCKED();
|
|
|
|
KASSERT(st->key[idx] == NULL);
|
|
sk->sk_removed = 0;
|
|
cur = RBT_INSERT(pf_state_tree, &pf_statetbl, sk);
|
|
if (cur != NULL) {
|
|
sk->sk_removed = 1;
|
|
/* key exists. check for same kif, if none, add to key */
|
|
TAILQ_FOREACH(si, &cur->sk_states, si_entry) {
|
|
struct pf_state *sist = si->si_st;
|
|
if (sist->kif == st->kif &&
|
|
((sist->key[PF_SK_WIRE]->af == sk->af &&
|
|
sist->direction == st->direction) ||
|
|
(sist->key[PF_SK_WIRE]->af !=
|
|
sist->key[PF_SK_STACK]->af &&
|
|
sk->af == sist->key[PF_SK_STACK]->af &&
|
|
sist->direction != st->direction))) {
|
|
int reuse = 0;
|
|
|
|
if (sk->proto == IPPROTO_TCP &&
|
|
sist->src.state >= TCPS_FIN_WAIT_2 &&
|
|
sist->dst.state >= TCPS_FIN_WAIT_2)
|
|
reuse = 1;
|
|
if (pf_status.debug >= LOG_NOTICE) {
|
|
log(LOG_NOTICE,
|
|
"pf: %s key attach %s on %s: ",
|
|
(idx == PF_SK_WIRE) ?
|
|
"wire" : "stack",
|
|
reuse ? "reuse" : "failed",
|
|
st->kif->pfik_name);
|
|
pf_print_state_parts(st,
|
|
(idx == PF_SK_WIRE) ? sk : NULL,
|
|
(idx == PF_SK_STACK) ? sk : NULL);
|
|
addlog(", existing: ");
|
|
pf_print_state_parts(sist,
|
|
(idx == PF_SK_WIRE) ? sk : NULL,
|
|
(idx == PF_SK_STACK) ? sk : NULL);
|
|
addlog("\n");
|
|
}
|
|
if (reuse) {
|
|
pf_set_protostate(sist, PF_PEER_BOTH,
|
|
TCPS_CLOSED);
|
|
/* remove late or sks can go away */
|
|
oldst = sist;
|
|
} else {
|
|
pf_state_key_unref(sk);
|
|
return (NULL); /* collision! */
|
|
}
|
|
}
|
|
}
|
|
|
|
/* reuse the existing state key */
|
|
pf_state_key_unref(sk);
|
|
sk = cur;
|
|
}
|
|
|
|
if ((si = pool_get(&pf_state_item_pl, PR_NOWAIT)) == NULL) {
|
|
if (TAILQ_EMPTY(&sk->sk_states)) {
|
|
KASSERT(cur == NULL);
|
|
RBT_REMOVE(pf_state_tree, &pf_statetbl, sk);
|
|
sk->sk_removed = 1;
|
|
pf_state_key_unref(sk);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
st->key[idx] = pf_state_key_ref(sk); /* give a ref to state */
|
|
si->si_st = pf_state_ref(st);
|
|
|
|
/* list is sorted, if-bound states before floating */
|
|
if (st->kif == pfi_all)
|
|
TAILQ_INSERT_TAIL(&sk->sk_states, si, si_entry);
|
|
else
|
|
TAILQ_INSERT_HEAD(&sk->sk_states, si, si_entry);
|
|
|
|
if (oldst)
|
|
pf_remove_state(oldst);
|
|
|
|
/* caller owns the pf_state ref, which owns a pf_state_key ref now */
|
|
return (sk);
|
|
}
|
|
|
|
void
|
|
pf_detach_state(struct pf_state *st)
|
|
{
|
|
KASSERT(st->key[PF_SK_WIRE] != NULL);
|
|
pf_state_key_detach(st, PF_SK_WIRE);
|
|
|
|
KASSERT(st->key[PF_SK_STACK] != NULL);
|
|
if (st->key[PF_SK_STACK] != st->key[PF_SK_WIRE])
|
|
pf_state_key_detach(st, PF_SK_STACK);
|
|
}
|
|
|
|
void
|
|
pf_state_key_detach(struct pf_state *st, int idx)
|
|
{
|
|
struct pf_state_item *si;
|
|
struct pf_state_key *sk;
|
|
|
|
PF_ASSERT_LOCKED();
|
|
|
|
sk = st->key[idx];
|
|
if (sk == NULL)
|
|
return;
|
|
|
|
TAILQ_FOREACH(si, &sk->sk_states, si_entry) {
|
|
if (si->si_st == st)
|
|
break;
|
|
}
|
|
if (si == NULL)
|
|
return;
|
|
|
|
TAILQ_REMOVE(&sk->sk_states, si, si_entry);
|
|
pool_put(&pf_state_item_pl, si);
|
|
|
|
if (TAILQ_EMPTY(&sk->sk_states)) {
|
|
RBT_REMOVE(pf_state_tree, &pf_statetbl, sk);
|
|
sk->sk_removed = 1;
|
|
pf_state_key_unlink_reverse(sk);
|
|
pf_state_key_unlink_inpcb(sk);
|
|
pf_state_key_unref(sk);
|
|
}
|
|
|
|
pf_state_unref(st);
|
|
}
|
|
|
|
struct pf_state_key *
|
|
pf_alloc_state_key(int pool_flags)
|
|
{
|
|
struct pf_state_key *sk;
|
|
|
|
if ((sk = pool_get(&pf_state_key_pl, pool_flags)) == NULL)
|
|
return (NULL);
|
|
|
|
PF_REF_INIT(sk->sk_refcnt);
|
|
TAILQ_INIT(&sk->sk_states);
|
|
sk->sk_removed = 1;
|
|
|
|
return (sk);
|
|
}
|
|
|
|
static __inline int
|
|
pf_state_key_addr_setup(struct pf_pdesc *pd, void *arg, int sidx,
|
|
struct pf_addr *saddr, int didx, struct pf_addr *daddr, int af, int multi)
|
|
{
|
|
struct pf_state_key_cmp *key = arg;
|
|
#ifdef INET6
|
|
struct pf_addr *target;
|
|
|
|
if (af == AF_INET || pd->proto != IPPROTO_ICMPV6)
|
|
goto copy;
|
|
|
|
switch (pd->hdr.icmp6.icmp6_type) {
|
|
case ND_NEIGHBOR_SOLICIT:
|
|
if (multi)
|
|
return (-1);
|
|
target = (struct pf_addr *)&pd->hdr.nd_ns.nd_ns_target;
|
|
daddr = target;
|
|
break;
|
|
case ND_NEIGHBOR_ADVERT:
|
|
if (multi)
|
|
return (-1);
|
|
target = (struct pf_addr *)&pd->hdr.nd_ns.nd_ns_target;
|
|
saddr = target;
|
|
if (IN6_IS_ADDR_MULTICAST(&pd->dst->v6)) {
|
|
key->addr[didx].addr32[0] = 0;
|
|
key->addr[didx].addr32[1] = 0;
|
|
key->addr[didx].addr32[2] = 0;
|
|
key->addr[didx].addr32[3] = 0;
|
|
daddr = NULL; /* overwritten */
|
|
}
|
|
break;
|
|
default:
|
|
if (multi) {
|
|
key->addr[sidx].addr32[0] = __IPV6_ADDR_INT32_MLL;
|
|
key->addr[sidx].addr32[1] = 0;
|
|
key->addr[sidx].addr32[2] = 0;
|
|
key->addr[sidx].addr32[3] = __IPV6_ADDR_INT32_ONE;
|
|
saddr = NULL; /* overwritten */
|
|
}
|
|
}
|
|
copy:
|
|
#endif /* INET6 */
|
|
if (saddr)
|
|
pf_addrcpy(&key->addr[sidx], saddr, af);
|
|
if (daddr)
|
|
pf_addrcpy(&key->addr[didx], daddr, af);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
pf_state_key_setup(struct pf_pdesc *pd, struct pf_state_key **skw,
|
|
struct pf_state_key **sks, int rtableid)
|
|
{
|
|
/* if returning error we MUST pool_put state keys ourselves */
|
|
struct pf_state_key *sk1, *sk2;
|
|
u_int wrdom = pd->rdomain;
|
|
int afto = pd->af != pd->naf;
|
|
|
|
if ((sk1 = pf_alloc_state_key(PR_NOWAIT | PR_ZERO)) == NULL)
|
|
return (ENOMEM);
|
|
|
|
pf_state_key_addr_setup(pd, sk1, pd->sidx, pd->src, pd->didx, pd->dst,
|
|
pd->af, 0);
|
|
sk1->port[pd->sidx] = pd->osport;
|
|
sk1->port[pd->didx] = pd->odport;
|
|
sk1->proto = pd->proto;
|
|
sk1->af = pd->af;
|
|
sk1->rdomain = pd->rdomain;
|
|
sk1->hash = pf_pkt_hash(sk1->af, sk1->proto,
|
|
&sk1->addr[0], &sk1->addr[1], sk1->port[0], sk1->port[1]);
|
|
if (rtableid >= 0)
|
|
wrdom = rtable_l2(rtableid);
|
|
|
|
if (PF_ANEQ(&pd->nsaddr, pd->src, pd->af) ||
|
|
PF_ANEQ(&pd->ndaddr, pd->dst, pd->af) ||
|
|
pd->nsport != pd->osport || pd->ndport != pd->odport ||
|
|
wrdom != pd->rdomain || afto) { /* NAT/NAT64 */
|
|
if ((sk2 = pf_alloc_state_key(PR_NOWAIT | PR_ZERO)) == NULL) {
|
|
pf_state_key_unref(sk1);
|
|
return (ENOMEM);
|
|
}
|
|
pf_state_key_addr_setup(pd, sk2, afto ? pd->didx : pd->sidx,
|
|
&pd->nsaddr, afto ? pd->sidx : pd->didx, &pd->ndaddr,
|
|
pd->naf, 0);
|
|
sk2->port[afto ? pd->didx : pd->sidx] = pd->nsport;
|
|
sk2->port[afto ? pd->sidx : pd->didx] = pd->ndport;
|
|
if (afto) {
|
|
switch (pd->proto) {
|
|
case IPPROTO_ICMP:
|
|
sk2->proto = IPPROTO_ICMPV6;
|
|
break;
|
|
case IPPROTO_ICMPV6:
|
|
sk2->proto = IPPROTO_ICMP;
|
|
break;
|
|
default:
|
|
sk2->proto = pd->proto;
|
|
}
|
|
} else
|
|
sk2->proto = pd->proto;
|
|
sk2->af = pd->naf;
|
|
sk2->rdomain = wrdom;
|
|
sk2->hash = pf_pkt_hash(sk2->af, sk2->proto,
|
|
&sk2->addr[0], &sk2->addr[1], sk2->port[0], sk2->port[1]);
|
|
} else
|
|
sk2 = pf_state_key_ref(sk1);
|
|
|
|
if (pd->dir == PF_IN) {
|
|
*skw = sk1;
|
|
*sks = sk2;
|
|
} else {
|
|
*sks = sk1;
|
|
*skw = sk2;
|
|
}
|
|
|
|
if (pf_status.debug >= LOG_DEBUG) {
|
|
log(LOG_DEBUG, "pf: key setup: ");
|
|
pf_print_state_parts(NULL, *skw, *sks);
|
|
addlog("\n");
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* pf_state_insert() does the following:
|
|
* - links the pf_state up with pf_state_key(s).
|
|
* - inserts the pf_state_keys into pf_state_tree.
|
|
* - inserts the pf_state into the into pf_state_tree_id.
|
|
* - tells pfsync about the state.
|
|
*
|
|
* pf_state_insert() owns the references to the pf_state_key structs
|
|
* it is given. on failure to insert, these references are released.
|
|
* on success, the caller owns a pf_state reference that allows it
|
|
* to access the state keys.
|
|
*/
|
|
|
|
int
|
|
pf_state_insert(struct pfi_kif *kif, struct pf_state_key **skwp,
|
|
struct pf_state_key **sksp, struct pf_state *st)
|
|
{
|
|
struct pf_state_key *skw = *skwp;
|
|
struct pf_state_key *sks = *sksp;
|
|
int same = (skw == sks);
|
|
|
|
PF_ASSERT_LOCKED();
|
|
|
|
st->kif = kif;
|
|
PF_STATE_ENTER_WRITE();
|
|
|
|
skw = pf_state_key_attach(skw, st, PF_SK_WIRE);
|
|
if (skw == NULL) {
|
|
pf_state_key_unref(sks);
|
|
PF_STATE_EXIT_WRITE();
|
|
return (-1);
|
|
}
|
|
|
|
if (same) {
|
|
/* pf_state_key_attach might have swapped skw */
|
|
pf_state_key_unref(sks);
|
|
st->key[PF_SK_STACK] = sks = pf_state_key_ref(skw);
|
|
} else if (pf_state_key_attach(sks, st, PF_SK_STACK) == NULL) {
|
|
pf_state_key_detach(st, PF_SK_WIRE);
|
|
PF_STATE_EXIT_WRITE();
|
|
return (-1);
|
|
}
|
|
|
|
if (st->id == 0 && st->creatorid == 0) {
|
|
st->id = htobe64(pf_status.stateid++);
|
|
st->creatorid = pf_status.hostid;
|
|
}
|
|
if (RBT_INSERT(pf_state_tree_id, &tree_id, st) != NULL) {
|
|
if (pf_status.debug >= LOG_NOTICE) {
|
|
log(LOG_NOTICE, "pf: state insert failed: "
|
|
"id: %016llx creatorid: %08x",
|
|
betoh64(st->id), ntohl(st->creatorid));
|
|
addlog("\n");
|
|
}
|
|
pf_detach_state(st);
|
|
PF_STATE_EXIT_WRITE();
|
|
return (-1);
|
|
}
|
|
pf_state_list_insert(&pf_state_list, st);
|
|
pf_status.fcounters[FCNT_STATE_INSERT]++;
|
|
pf_status.states++;
|
|
pfi_kif_ref(kif, PFI_KIF_REF_STATE);
|
|
PF_STATE_EXIT_WRITE();
|
|
|
|
#if NPFSYNC > 0
|
|
pfsync_insert_state(st);
|
|
#endif /* NPFSYNC > 0 */
|
|
|
|
*skwp = skw;
|
|
*sksp = sks;
|
|
|
|
return (0);
|
|
}
|
|
|
|
struct pf_state *
|
|
pf_find_state_byid(struct pf_state_cmp *key)
|
|
{
|
|
pf_status.fcounters[FCNT_STATE_SEARCH]++;
|
|
|
|
return (RBT_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key));
|
|
}
|
|
|
|
int
|
|
pf_compare_state_keys(struct pf_state_key *a, struct pf_state_key *b,
|
|
struct pfi_kif *kif, u_int dir)
|
|
{
|
|
/* a (from hdr) and b (new) must be exact opposites of each other */
|
|
if (a->af == b->af && a->proto == b->proto &&
|
|
PF_AEQ(&a->addr[0], &b->addr[1], a->af) &&
|
|
PF_AEQ(&a->addr[1], &b->addr[0], a->af) &&
|
|
a->port[0] == b->port[1] &&
|
|
a->port[1] == b->port[0] && a->rdomain == b->rdomain)
|
|
return (0);
|
|
else {
|
|
/* mismatch. must not happen. */
|
|
if (pf_status.debug >= LOG_ERR) {
|
|
log(LOG_ERR,
|
|
"pf: state key linking mismatch! dir=%s, "
|
|
"if=%s, stored af=%u, a0: ",
|
|
dir == PF_OUT ? "OUT" : "IN",
|
|
kif->pfik_name, a->af);
|
|
pf_print_host(&a->addr[0], a->port[0], a->af);
|
|
addlog(", a1: ");
|
|
pf_print_host(&a->addr[1], a->port[1], a->af);
|
|
addlog(", proto=%u", a->proto);
|
|
addlog(", found af=%u, a0: ", b->af);
|
|
pf_print_host(&b->addr[0], b->port[0], b->af);
|
|
addlog(", a1: ");
|
|
pf_print_host(&b->addr[1], b->port[1], b->af);
|
|
addlog(", proto=%u", b->proto);
|
|
addlog("\n");
|
|
}
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
int
|
|
pf_find_state(struct pf_pdesc *pd, struct pf_state_key_cmp *key,
|
|
struct pf_state **stp)
|
|
{
|
|
struct pf_state_key *sk, *pkt_sk;
|
|
struct pf_state_item *si;
|
|
struct pf_state *st = NULL;
|
|
|
|
pf_status.fcounters[FCNT_STATE_SEARCH]++;
|
|
if (pf_status.debug >= LOG_DEBUG) {
|
|
log(LOG_DEBUG, "pf: key search, %s on %s: ",
|
|
pd->dir == PF_OUT ? "out" : "in", pd->kif->pfik_name);
|
|
pf_print_state_parts(NULL, (struct pf_state_key *)key, NULL);
|
|
addlog("\n");
|
|
}
|
|
|
|
pkt_sk = NULL;
|
|
sk = NULL;
|
|
if (pd->dir == PF_OUT) {
|
|
/* first if block deals with outbound forwarded packet */
|
|
pkt_sk = pd->m->m_pkthdr.pf.statekey;
|
|
|
|
if (!pf_state_key_isvalid(pkt_sk)) {
|
|
pf_mbuf_unlink_state_key(pd->m);
|
|
pkt_sk = NULL;
|
|
}
|
|
|
|
if (pkt_sk && pf_state_key_isvalid(pkt_sk->sk_reverse))
|
|
sk = pkt_sk->sk_reverse;
|
|
|
|
if (pkt_sk == NULL) {
|
|
struct inpcb *inp = pd->m->m_pkthdr.pf.inp;
|
|
|
|
/* here we deal with local outbound packet */
|
|
if (inp != NULL) {
|
|
struct pf_state_key *inp_sk;
|
|
|
|
mtx_enter(&pf_inp_mtx);
|
|
inp_sk = inp->inp_pf_sk;
|
|
if (pf_state_key_isvalid(inp_sk)) {
|
|
sk = inp_sk;
|
|
mtx_leave(&pf_inp_mtx);
|
|
} else if (inp_sk != NULL) {
|
|
KASSERT(inp_sk->sk_inp == inp);
|
|
inp_sk->sk_inp = NULL;
|
|
inp->inp_pf_sk = NULL;
|
|
mtx_leave(&pf_inp_mtx);
|
|
|
|
pf_state_key_unref(inp_sk);
|
|
in_pcbunref(inp);
|
|
} else
|
|
mtx_leave(&pf_inp_mtx);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (sk == NULL) {
|
|
if ((sk = RBT_FIND(pf_state_tree, &pf_statetbl,
|
|
(struct pf_state_key *)key)) == NULL)
|
|
return (PF_DROP);
|
|
if (pd->dir == PF_OUT && pkt_sk &&
|
|
pf_compare_state_keys(pkt_sk, sk, pd->kif, pd->dir) == 0)
|
|
pf_state_key_link_reverse(sk, pkt_sk);
|
|
else if (pd->dir == PF_OUT)
|
|
pf_state_key_link_inpcb(sk, pd->m->m_pkthdr.pf.inp);
|
|
}
|
|
|
|
/* remove firewall data from outbound packet */
|
|
if (pd->dir == PF_OUT)
|
|
pf_pkt_addr_changed(pd->m);
|
|
|
|
/* list is sorted, if-bound states before floating ones */
|
|
TAILQ_FOREACH(si, &sk->sk_states, si_entry) {
|
|
struct pf_state *sist = si->si_st;
|
|
if (sist->timeout != PFTM_PURGE &&
|
|
(sist->kif == pfi_all || sist->kif == pd->kif) &&
|
|
((sist->key[PF_SK_WIRE]->af == sist->key[PF_SK_STACK]->af &&
|
|
sk == (pd->dir == PF_IN ? sist->key[PF_SK_WIRE] :
|
|
sist->key[PF_SK_STACK])) ||
|
|
(sist->key[PF_SK_WIRE]->af != sist->key[PF_SK_STACK]->af
|
|
&& pd->dir == PF_IN && (sk == sist->key[PF_SK_STACK] ||
|
|
sk == sist->key[PF_SK_WIRE])))) {
|
|
st = sist;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (st == NULL)
|
|
return (PF_DROP);
|
|
if (ISSET(st->state_flags, PFSTATE_INP_UNLINKED))
|
|
return (PF_DROP);
|
|
|
|
if (st->rule.ptr->pktrate.limit && pd->dir == st->direction) {
|
|
pf_add_threshold(&st->rule.ptr->pktrate);
|
|
if (pf_check_threshold(&st->rule.ptr->pktrate))
|
|
return (PF_DROP);
|
|
}
|
|
|
|
*stp = st;
|
|
|
|
return (PF_MATCH);
|
|
}
|
|
|
|
struct pf_state *
|
|
pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
|
|
{
|
|
struct pf_state_key *sk;
|
|
struct pf_state_item *si, *ret = NULL;
|
|
|
|
pf_status.fcounters[FCNT_STATE_SEARCH]++;
|
|
|
|
sk = RBT_FIND(pf_state_tree, &pf_statetbl, (struct pf_state_key *)key);
|
|
|
|
if (sk != NULL) {
|
|
TAILQ_FOREACH(si, &sk->sk_states, si_entry) {
|
|
struct pf_state *sist = si->si_st;
|
|
if (dir == PF_INOUT ||
|
|
(sk == (dir == PF_IN ? sist->key[PF_SK_WIRE] :
|
|
sist->key[PF_SK_STACK]))) {
|
|
if (more == NULL)
|
|
return (sist);
|
|
|
|
if (ret)
|
|
(*more)++;
|
|
else
|
|
ret = si;
|
|
}
|
|
}
|
|
}
|
|
return (ret ? ret->si_st : NULL);
|
|
}
|
|
|
|
void
|
|
pf_state_peer_hton(const struct pf_state_peer *s, struct pfsync_state_peer *d)
|
|
{
|
|
d->seqlo = htonl(s->seqlo);
|
|
d->seqhi = htonl(s->seqhi);
|
|
d->seqdiff = htonl(s->seqdiff);
|
|
d->max_win = htons(s->max_win);
|
|
d->mss = htons(s->mss);
|
|
d->state = s->state;
|
|
d->wscale = s->wscale;
|
|
if (s->scrub) {
|
|
d->scrub.pfss_flags =
|
|
htons(s->scrub->pfss_flags & PFSS_TIMESTAMP);
|
|
d->scrub.pfss_ttl = (s)->scrub->pfss_ttl;
|
|
d->scrub.pfss_ts_mod = htonl((s)->scrub->pfss_ts_mod);
|
|
d->scrub.scrub_flag = PFSYNC_SCRUB_FLAG_VALID;
|
|
}
|
|
}
|
|
|
|
void
|
|
pf_state_peer_ntoh(const struct pfsync_state_peer *s, struct pf_state_peer *d)
|
|
{
|
|
d->seqlo = ntohl(s->seqlo);
|
|
d->seqhi = ntohl(s->seqhi);
|
|
d->seqdiff = ntohl(s->seqdiff);
|
|
d->max_win = ntohs(s->max_win);
|
|
d->mss = ntohs(s->mss);
|
|
d->state = s->state;
|
|
d->wscale = s->wscale;
|
|
if (s->scrub.scrub_flag == PFSYNC_SCRUB_FLAG_VALID &&
|
|
d->scrub != NULL) {
|
|
d->scrub->pfss_flags =
|
|
ntohs(s->scrub.pfss_flags) & PFSS_TIMESTAMP;
|
|
d->scrub->pfss_ttl = s->scrub.pfss_ttl;
|
|
d->scrub->pfss_ts_mod = ntohl(s->scrub.pfss_ts_mod);
|
|
}
|
|
}
|
|
|
|
void
|
|
pf_state_export(struct pfsync_state *sp, struct pf_state *st)
|
|
{
|
|
int32_t expire;
|
|
|
|
memset(sp, 0, sizeof(struct pfsync_state));
|
|
|
|
/* copy from state key */
|
|
sp->key[PF_SK_WIRE].addr[0] = st->key[PF_SK_WIRE]->addr[0];
|
|
sp->key[PF_SK_WIRE].addr[1] = st->key[PF_SK_WIRE]->addr[1];
|
|
sp->key[PF_SK_WIRE].port[0] = st->key[PF_SK_WIRE]->port[0];
|
|
sp->key[PF_SK_WIRE].port[1] = st->key[PF_SK_WIRE]->port[1];
|
|
sp->key[PF_SK_WIRE].rdomain = htons(st->key[PF_SK_WIRE]->rdomain);
|
|
sp->key[PF_SK_WIRE].af = st->key[PF_SK_WIRE]->af;
|
|
sp->key[PF_SK_STACK].addr[0] = st->key[PF_SK_STACK]->addr[0];
|
|
sp->key[PF_SK_STACK].addr[1] = st->key[PF_SK_STACK]->addr[1];
|
|
sp->key[PF_SK_STACK].port[0] = st->key[PF_SK_STACK]->port[0];
|
|
sp->key[PF_SK_STACK].port[1] = st->key[PF_SK_STACK]->port[1];
|
|
sp->key[PF_SK_STACK].rdomain = htons(st->key[PF_SK_STACK]->rdomain);
|
|
sp->key[PF_SK_STACK].af = st->key[PF_SK_STACK]->af;
|
|
sp->rtableid[PF_SK_WIRE] = htonl(st->rtableid[PF_SK_WIRE]);
|
|
sp->rtableid[PF_SK_STACK] = htonl(st->rtableid[PF_SK_STACK]);
|
|
sp->proto = st->key[PF_SK_WIRE]->proto;
|
|
sp->af = st->key[PF_SK_WIRE]->af;
|
|
|
|
/* copy from state */
|
|
strlcpy(sp->ifname, st->kif->pfik_name, sizeof(sp->ifname));
|
|
sp->rt = st->rt;
|
|
sp->rt_addr = st->rt_addr;
|
|
sp->creation = htonl(getuptime() - st->creation);
|
|
expire = pf_state_expires(st, st->timeout);
|
|
if (expire <= getuptime())
|
|
sp->expire = htonl(0);
|
|
else
|
|
sp->expire = htonl(expire - getuptime());
|
|
|
|
sp->direction = st->direction;
|
|
#if NPFLOG > 0
|
|
sp->log = st->log;
|
|
#endif /* NPFLOG > 0 */
|
|
sp->timeout = st->timeout;
|
|
sp->state_flags = htons(st->state_flags);
|
|
if (READ_ONCE(st->sync_defer) != NULL)
|
|
sp->state_flags |= htons(PFSTATE_ACK);
|
|
if (!SLIST_EMPTY(&st->src_nodes))
|
|
sp->sync_flags |= PFSYNC_FLAG_SRCNODE;
|
|
|
|
sp->id = st->id;
|
|
sp->creatorid = st->creatorid;
|
|
pf_state_peer_hton(&st->src, &sp->src);
|
|
pf_state_peer_hton(&st->dst, &sp->dst);
|
|
|
|
if (st->rule.ptr == NULL)
|
|
sp->rule = htonl(-1);
|
|
else
|
|
sp->rule = htonl(st->rule.ptr->nr);
|
|
if (st->anchor.ptr == NULL)
|
|
sp->anchor = htonl(-1);
|
|
else
|
|
sp->anchor = htonl(st->anchor.ptr->nr);
|
|
sp->nat_rule = htonl(-1); /* left for compat, nat_rule is gone */
|
|
|
|
pf_state_counter_hton(st->packets[0], sp->packets[0]);
|
|
pf_state_counter_hton(st->packets[1], sp->packets[1]);
|
|
pf_state_counter_hton(st->bytes[0], sp->bytes[0]);
|
|
pf_state_counter_hton(st->bytes[1], sp->bytes[1]);
|
|
|
|
sp->max_mss = htons(st->max_mss);
|
|
sp->min_ttl = st->min_ttl;
|
|
sp->set_tos = st->set_tos;
|
|
sp->set_prio[0] = st->set_prio[0];
|
|
sp->set_prio[1] = st->set_prio[1];
|
|
}
|
|
|
|
int
|
|
pf_state_alloc_scrub_memory(const struct pfsync_state_peer *s,
|
|
struct pf_state_peer *d)
|
|
{
|
|
if (s->scrub.scrub_flag && d->scrub == NULL)
|
|
return (pf_normalize_tcp_alloc(d));
|
|
|
|
return (0);
|
|
}
|
|
|
|
#if NPFSYNC > 0
|
|
int
|
|
pf_state_import(const struct pfsync_state *sp, int flags)
|
|
{
|
|
struct pf_state *st = NULL;
|
|
struct pf_state_key *skw = NULL, *sks = NULL;
|
|
struct pf_rule *r = NULL;
|
|
struct pfi_kif *kif;
|
|
int pool_flags;
|
|
int error = ENOMEM;
|
|
int n = 0;
|
|
|
|
PF_ASSERT_LOCKED();
|
|
|
|
if (sp->creatorid == 0) {
|
|
DPFPRINTF(LOG_NOTICE, "%s: invalid creator id: %08x", __func__,
|
|
ntohl(sp->creatorid));
|
|
return (EINVAL);
|
|
}
|
|
|
|
if ((kif = pfi_kif_get(sp->ifname, NULL)) == NULL) {
|
|
DPFPRINTF(LOG_NOTICE, "%s: unknown interface: %s", __func__,
|
|
sp->ifname);
|
|
if (flags & PFSYNC_SI_IOCTL)
|
|
return (EINVAL);
|
|
return (0); /* skip this state */
|
|
}
|
|
|
|
if (sp->af == 0)
|
|
return (0); /* skip this state */
|
|
|
|
/*
|
|
* If the ruleset checksums match or the state is coming from the ioctl,
|
|
* it's safe to associate the state with the rule of that number.
|
|
*/
|
|
if (sp->rule != htonl(-1) && sp->anchor == htonl(-1) &&
|
|
(flags & (PFSYNC_SI_IOCTL | PFSYNC_SI_CKSUM)) &&
|
|
ntohl(sp->rule) < pf_main_ruleset.rules.active.rcount) {
|
|
TAILQ_FOREACH(r, pf_main_ruleset.rules.active.ptr, entries)
|
|
if (ntohl(sp->rule) == n++)
|
|
break;
|
|
} else
|
|
r = &pf_default_rule;
|
|
|
|
if ((r->max_states && r->states_cur >= r->max_states))
|
|
goto cleanup;
|
|
|
|
if (flags & PFSYNC_SI_IOCTL)
|
|
pool_flags = PR_WAITOK | PR_LIMITFAIL | PR_ZERO;
|
|
else
|
|
pool_flags = PR_NOWAIT | PR_LIMITFAIL | PR_ZERO;
|
|
|
|
if ((st = pool_get(&pf_state_pl, pool_flags)) == NULL)
|
|
goto cleanup;
|
|
|
|
if ((skw = pf_alloc_state_key(pool_flags)) == NULL)
|
|
goto cleanup;
|
|
|
|
if ((sp->key[PF_SK_WIRE].af &&
|
|
(sp->key[PF_SK_WIRE].af != sp->key[PF_SK_STACK].af)) ||
|
|
PF_ANEQ(&sp->key[PF_SK_WIRE].addr[0],
|
|
&sp->key[PF_SK_STACK].addr[0], sp->af) ||
|
|
PF_ANEQ(&sp->key[PF_SK_WIRE].addr[1],
|
|
&sp->key[PF_SK_STACK].addr[1], sp->af) ||
|
|
sp->key[PF_SK_WIRE].port[0] != sp->key[PF_SK_STACK].port[0] ||
|
|
sp->key[PF_SK_WIRE].port[1] != sp->key[PF_SK_STACK].port[1] ||
|
|
sp->key[PF_SK_WIRE].rdomain != sp->key[PF_SK_STACK].rdomain) {
|
|
if ((sks = pf_alloc_state_key(pool_flags)) == NULL)
|
|
goto cleanup;
|
|
} else
|
|
sks = pf_state_key_ref(skw);
|
|
|
|
/* allocate memory for scrub info */
|
|
if (pf_state_alloc_scrub_memory(&sp->src, &st->src) ||
|
|
pf_state_alloc_scrub_memory(&sp->dst, &st->dst))
|
|
goto cleanup;
|
|
|
|
/* copy to state key(s) */
|
|
skw->addr[0] = sp->key[PF_SK_WIRE].addr[0];
|
|
skw->addr[1] = sp->key[PF_SK_WIRE].addr[1];
|
|
skw->port[0] = sp->key[PF_SK_WIRE].port[0];
|
|
skw->port[1] = sp->key[PF_SK_WIRE].port[1];
|
|
skw->rdomain = ntohs(sp->key[PF_SK_WIRE].rdomain);
|
|
skw->proto = sp->proto;
|
|
if (!(skw->af = sp->key[PF_SK_WIRE].af))
|
|
skw->af = sp->af;
|
|
skw->hash = pf_pkt_hash(skw->af, skw->proto,
|
|
&skw->addr[0], &skw->addr[1], skw->port[0], skw->port[1]);
|
|
|
|
if (sks != skw) {
|
|
sks->addr[0] = sp->key[PF_SK_STACK].addr[0];
|
|
sks->addr[1] = sp->key[PF_SK_STACK].addr[1];
|
|
sks->port[0] = sp->key[PF_SK_STACK].port[0];
|
|
sks->port[1] = sp->key[PF_SK_STACK].port[1];
|
|
sks->rdomain = ntohs(sp->key[PF_SK_STACK].rdomain);
|
|
if (!(sks->af = sp->key[PF_SK_STACK].af))
|
|
sks->af = sp->af;
|
|
if (sks->af != skw->af) {
|
|
switch (sp->proto) {
|
|
case IPPROTO_ICMP:
|
|
sks->proto = IPPROTO_ICMPV6;
|
|
break;
|
|
case IPPROTO_ICMPV6:
|
|
sks->proto = IPPROTO_ICMP;
|
|
break;
|
|
default:
|
|
sks->proto = sp->proto;
|
|
}
|
|
} else
|
|
sks->proto = sp->proto;
|
|
|
|
if (((sks->af != AF_INET) && (sks->af != AF_INET6)) ||
|
|
((skw->af != AF_INET) && (skw->af != AF_INET6))) {
|
|
error = EINVAL;
|
|
goto cleanup;
|
|
}
|
|
|
|
sks->hash = pf_pkt_hash(sks->af, sks->proto,
|
|
&sks->addr[0], &sks->addr[1], sks->port[0], sks->port[1]);
|
|
|
|
} else if ((sks->af != AF_INET) && (sks->af != AF_INET6)) {
|
|
error = EINVAL;
|
|
goto cleanup;
|
|
}
|
|
st->rtableid[PF_SK_WIRE] = ntohl(sp->rtableid[PF_SK_WIRE]);
|
|
st->rtableid[PF_SK_STACK] = ntohl(sp->rtableid[PF_SK_STACK]);
|
|
|
|
/* copy to state */
|
|
st->rt_addr = sp->rt_addr;
|
|
st->rt = sp->rt;
|
|
st->creation = getuptime() - ntohl(sp->creation);
|
|
st->expire = getuptime();
|
|
if (ntohl(sp->expire)) {
|
|
u_int32_t timeout;
|
|
|
|
timeout = r->timeout[sp->timeout];
|
|
if (!timeout)
|
|
timeout = pf_default_rule.timeout[sp->timeout];
|
|
|
|
/* sp->expire may have been adaptively scaled by export. */
|
|
st->expire -= timeout - ntohl(sp->expire);
|
|
}
|
|
|
|
st->direction = sp->direction;
|
|
st->log = sp->log;
|
|
st->timeout = sp->timeout;
|
|
st->state_flags = ntohs(sp->state_flags);
|
|
st->max_mss = ntohs(sp->max_mss);
|
|
st->min_ttl = sp->min_ttl;
|
|
st->set_tos = sp->set_tos;
|
|
st->set_prio[0] = sp->set_prio[0];
|
|
st->set_prio[1] = sp->set_prio[1];
|
|
|
|
st->id = sp->id;
|
|
st->creatorid = sp->creatorid;
|
|
pf_state_peer_ntoh(&sp->src, &st->src);
|
|
pf_state_peer_ntoh(&sp->dst, &st->dst);
|
|
|
|
st->rule.ptr = r;
|
|
st->anchor.ptr = NULL;
|
|
|
|
PF_REF_INIT(st->refcnt);
|
|
mtx_init(&st->mtx, IPL_NET);
|
|
|
|
/* XXX when we have anchors, use STATE_INC_COUNTERS */
|
|
r->states_cur++;
|
|
r->states_tot++;
|
|
|
|
st->sync_state = PFSYNC_S_NONE;
|
|
st->pfsync_time = getuptime();
|
|
#if NPFSYNC > 0
|
|
pfsync_init_state(st, skw, sks, flags);
|
|
#endif
|
|
|
|
if (pf_state_insert(kif, &skw, &sks, st) != 0) {
|
|
/* XXX when we have anchors, use STATE_DEC_COUNTERS */
|
|
r->states_cur--;
|
|
error = EEXIST;
|
|
goto cleanup_state;
|
|
}
|
|
|
|
return (0);
|
|
|
|
cleanup:
|
|
if (skw != NULL)
|
|
pf_state_key_unref(skw);
|
|
if (sks != NULL)
|
|
pf_state_key_unref(sks);
|
|
|
|
cleanup_state: /* pf_state_insert frees the state keys */
|
|
if (st) {
|
|
if (st->dst.scrub)
|
|
pool_put(&pf_state_scrub_pl, st->dst.scrub);
|
|
if (st->src.scrub)
|
|
pool_put(&pf_state_scrub_pl, st->src.scrub);
|
|
pool_put(&pf_state_pl, st);
|
|
}
|
|
return (error);
|
|
}
|
|
#endif /* NPFSYNC > 0 */
|
|
|
|
/* END state table stuff */
|
|
|
|
void pf_purge_states(void *);
|
|
struct task pf_purge_states_task =
|
|
TASK_INITIALIZER(pf_purge_states, NULL);
|
|
|
|
void pf_purge_states_tick(void *);
|
|
struct timeout pf_purge_states_to =
|
|
TIMEOUT_INITIALIZER(pf_purge_states_tick, NULL);
|
|
|
|
unsigned int pf_purge_expired_states(unsigned int, unsigned int);
|
|
|
|
/*
|
|
* how many states to scan this interval.
|
|
*
|
|
* this is set when the timeout fires, and reduced by the task. the
|
|
* task will reschedule itself until the limit is reduced to zero,
|
|
* and then it adds the timeout again.
|
|
*/
|
|
unsigned int pf_purge_states_limit;
|
|
|
|
/*
|
|
* limit how many states are processed with locks held per run of
|
|
* the state purge task.
|
|
*/
|
|
unsigned int pf_purge_states_collect = 64;
|
|
|
|
void
|
|
pf_purge_states_tick(void *null)
|
|
{
|
|
unsigned int limit = pf_status.states;
|
|
unsigned int interval = pf_default_rule.timeout[PFTM_INTERVAL];
|
|
|
|
if (limit == 0) {
|
|
timeout_add_sec(&pf_purge_states_to, 1);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* process a fraction of the state table every second
|
|
*/
|
|
|
|
if (interval > 1)
|
|
limit /= interval;
|
|
|
|
pf_purge_states_limit = limit;
|
|
task_add(systqmp, &pf_purge_states_task);
|
|
}
|
|
|
|
void
|
|
pf_purge_states(void *null)
|
|
{
|
|
unsigned int limit;
|
|
unsigned int scanned;
|
|
|
|
limit = pf_purge_states_limit;
|
|
if (limit < pf_purge_states_collect)
|
|
limit = pf_purge_states_collect;
|
|
|
|
scanned = pf_purge_expired_states(limit, pf_purge_states_collect);
|
|
if (scanned >= pf_purge_states_limit) {
|
|
/* we've run out of states to scan this "interval" */
|
|
timeout_add_sec(&pf_purge_states_to, 1);
|
|
return;
|
|
}
|
|
|
|
pf_purge_states_limit -= scanned;
|
|
task_add(systqmp, &pf_purge_states_task);
|
|
}
|
|
|
|
void pf_purge_tick(void *);
|
|
struct timeout pf_purge_to =
|
|
TIMEOUT_INITIALIZER(pf_purge_tick, NULL);
|
|
|
|
void pf_purge(void *);
|
|
struct task pf_purge_task =
|
|
TASK_INITIALIZER(pf_purge, NULL);
|
|
|
|
void
|
|
pf_purge_tick(void *null)
|
|
{
|
|
task_add(systqmp, &pf_purge_task);
|
|
}
|
|
|
|
void
|
|
pf_purge(void *null)
|
|
{
|
|
unsigned int interval = max(1, pf_default_rule.timeout[PFTM_INTERVAL]);
|
|
|
|
PF_LOCK();
|
|
|
|
pf_purge_expired_src_nodes();
|
|
|
|
PF_UNLOCK();
|
|
|
|
/*
|
|
* Fragments don't require PF_LOCK(), they use their own lock.
|
|
*/
|
|
pf_purge_expired_fragments();
|
|
|
|
/* interpret the interval as idle time between runs */
|
|
timeout_add_sec(&pf_purge_to, interval);
|
|
}
|
|
|
|
int32_t
|
|
pf_state_expires(const struct pf_state *st, uint8_t stimeout)
|
|
{
|
|
u_int32_t timeout;
|
|
u_int32_t start;
|
|
u_int32_t end;
|
|
u_int32_t states;
|
|
|
|
/*
|
|
* pf_state_expires is used by the state purge task to
|
|
* decide if a state is a candidate for cleanup, and by the
|
|
* pfsync state export code to populate an expiry time.
|
|
*
|
|
* this function may be called by the state purge task while
|
|
* the state is being modified. avoid inconsistent reads of
|
|
* state->timeout by having the caller do the read (and any
|
|
* checks it needs to do on the same variable) and then pass
|
|
* their view of the timeout in here for this function to use.
|
|
* the only consequence of using a stale timeout value is
|
|
* that the state won't be a candidate for purging until the
|
|
* next pass of the purge task.
|
|
*/
|
|
|
|
/* handle all PFTM_* >= PFTM_MAX here */
|
|
if (stimeout >= PFTM_MAX)
|
|
return (0);
|
|
|
|
KASSERT(stimeout < PFTM_MAX);
|
|
|
|
timeout = st->rule.ptr->timeout[stimeout];
|
|
if (!timeout)
|
|
timeout = pf_default_rule.timeout[stimeout];
|
|
|
|
start = st->rule.ptr->timeout[PFTM_ADAPTIVE_START];
|
|
if (start) {
|
|
end = st->rule.ptr->timeout[PFTM_ADAPTIVE_END];
|
|
states = st->rule.ptr->states_cur;
|
|
} else {
|
|
start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
|
|
end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
|
|
states = pf_status.states;
|
|
}
|
|
if (end && states > start && start < end) {
|
|
if (states >= end)
|
|
return (0);
|
|
|
|
timeout = (u_int64_t)timeout * (end - states) / (end - start);
|
|
}
|
|
|
|
return (st->expire + timeout);
|
|
}
|
|
|
|
void
|
|
pf_purge_expired_src_nodes(void)
|
|
{
|
|
struct pf_src_node *cur, *next;
|
|
|
|
PF_ASSERT_LOCKED();
|
|
|
|
RB_FOREACH_SAFE(cur, pf_src_tree, &tree_src_tracking, next) {
|
|
if (cur->states == 0 && cur->expire <= getuptime()) {
|
|
pf_remove_src_node(cur);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
pf_src_tree_remove_state(struct pf_state *st)
|
|
{
|
|
u_int32_t timeout;
|
|
struct pf_sn_item *sni;
|
|
|
|
while ((sni = SLIST_FIRST(&st->src_nodes)) != NULL) {
|
|
SLIST_REMOVE_HEAD(&st->src_nodes, next);
|
|
if (st->src.tcp_est)
|
|
--sni->sn->conn;
|
|
if (--sni->sn->states == 0) {
|
|
timeout = st->rule.ptr->timeout[PFTM_SRC_NODE];
|
|
if (!timeout)
|
|
timeout =
|
|
pf_default_rule.timeout[PFTM_SRC_NODE];
|
|
sni->sn->expire = getuptime() + timeout;
|
|
}
|
|
pool_put(&pf_sn_item_pl, sni);
|
|
}
|
|
}
|
|
|
|
void
|
|
pf_remove_state(struct pf_state *st)
|
|
{
|
|
PF_ASSERT_LOCKED();
|
|
|
|
mtx_enter(&st->mtx);
|
|
if (st->timeout == PFTM_UNLINKED) {
|
|
mtx_leave(&st->mtx);
|
|
return;
|
|
}
|
|
st->timeout = PFTM_UNLINKED;
|
|
mtx_leave(&st->mtx);
|
|
|
|
/* handle load balancing related tasks */
|
|
pf_postprocess_addr(st);
|
|
|
|
if (st->src.state == PF_TCPS_PROXY_DST) {
|
|
pf_send_tcp(st->rule.ptr, st->key[PF_SK_WIRE]->af,
|
|
&st->key[PF_SK_WIRE]->addr[1],
|
|
&st->key[PF_SK_WIRE]->addr[0],
|
|
st->key[PF_SK_WIRE]->port[1],
|
|
st->key[PF_SK_WIRE]->port[0],
|
|
st->src.seqhi, st->src.seqlo + 1,
|
|
TH_RST|TH_ACK, 0, 0, 0, 1, st->tag,
|
|
st->key[PF_SK_WIRE]->rdomain);
|
|
}
|
|
if (st->key[PF_SK_STACK]->proto == IPPROTO_TCP)
|
|
pf_set_protostate(st, PF_PEER_BOTH, TCPS_CLOSED);
|
|
|
|
RBT_REMOVE(pf_state_tree_id, &tree_id, st);
|
|
#if NPFLOW > 0
|
|
if (st->state_flags & PFSTATE_PFLOW)
|
|
export_pflow(st);
|
|
#endif /* NPFLOW > 0 */
|
|
#if NPFSYNC > 0
|
|
pfsync_delete_state(st);
|
|
#endif /* NPFSYNC > 0 */
|
|
pf_src_tree_remove_state(st);
|
|
pf_detach_state(st);
|
|
}
|
|
|
|
void
|
|
pf_remove_divert_state(struct inpcb *inp)
|
|
{
|
|
struct pf_state_key *sk;
|
|
struct pf_state_item *si;
|
|
|
|
PF_ASSERT_UNLOCKED();
|
|
|
|
if (READ_ONCE(inp->inp_pf_sk) == NULL)
|
|
return;
|
|
|
|
mtx_enter(&pf_inp_mtx);
|
|
sk = pf_state_key_ref(inp->inp_pf_sk);
|
|
mtx_leave(&pf_inp_mtx);
|
|
if (sk == NULL)
|
|
return;
|
|
|
|
PF_LOCK();
|
|
PF_STATE_ENTER_WRITE();
|
|
TAILQ_FOREACH(si, &sk->sk_states, si_entry) {
|
|
struct pf_state *sist = si->si_st;
|
|
if (sk == sist->key[PF_SK_STACK] && sist->rule.ptr &&
|
|
(sist->rule.ptr->divert.type == PF_DIVERT_TO ||
|
|
sist->rule.ptr->divert.type == PF_DIVERT_REPLY)) {
|
|
if (sist->key[PF_SK_STACK]->proto == IPPROTO_TCP &&
|
|
sist->key[PF_SK_WIRE] != sist->key[PF_SK_STACK]) {
|
|
/*
|
|
* If the local address is translated, keep
|
|
* the state for "tcp.closed" seconds to
|
|
* prevent its source port from being reused.
|
|
*/
|
|
if (sist->src.state < TCPS_FIN_WAIT_2 ||
|
|
sist->dst.state < TCPS_FIN_WAIT_2) {
|
|
pf_set_protostate(sist, PF_PEER_BOTH,
|
|
TCPS_TIME_WAIT);
|
|
pf_update_state_timeout(sist,
|
|
PFTM_TCP_CLOSED);
|
|
sist->expire = getuptime();
|
|
}
|
|
sist->state_flags |= PFSTATE_INP_UNLINKED;
|
|
} else
|
|
pf_remove_state(sist);
|
|
break;
|
|
}
|
|
}
|
|
PF_STATE_EXIT_WRITE();
|
|
PF_UNLOCK();
|
|
|
|
pf_state_key_unref(sk);
|
|
}
|
|
|
|
void
|
|
pf_free_state(struct pf_state *st)
|
|
{
|
|
struct pf_rule_item *ri;
|
|
|
|
PF_ASSERT_LOCKED();
|
|
|
|
#if NPFSYNC > 0
|
|
if (pfsync_state_in_use(st))
|
|
return;
|
|
#endif /* NPFSYNC > 0 */
|
|
|
|
KASSERT(st->timeout == PFTM_UNLINKED);
|
|
if (--st->rule.ptr->states_cur == 0 &&
|
|
st->rule.ptr->src_nodes == 0)
|
|
pf_rm_rule(NULL, st->rule.ptr);
|
|
if (st->anchor.ptr != NULL)
|
|
if (--st->anchor.ptr->states_cur == 0)
|
|
pf_rm_rule(NULL, st->anchor.ptr);
|
|
while ((ri = SLIST_FIRST(&st->match_rules))) {
|
|
SLIST_REMOVE_HEAD(&st->match_rules, entry);
|
|
if (--ri->r->states_cur == 0 &&
|
|
ri->r->src_nodes == 0)
|
|
pf_rm_rule(NULL, ri->r);
|
|
pool_put(&pf_rule_item_pl, ri);
|
|
}
|
|
pf_normalize_tcp_cleanup(st);
|
|
pfi_kif_unref(st->kif, PFI_KIF_REF_STATE);
|
|
pf_state_list_remove(&pf_state_list, st);
|
|
if (st->tag)
|
|
pf_tag_unref(st->tag);
|
|
pf_state_unref(st);
|
|
pf_status.fcounters[FCNT_STATE_REMOVALS]++;
|
|
pf_status.states--;
|
|
}
|
|
|
|
unsigned int
|
|
pf_purge_expired_states(const unsigned int limit, const unsigned int collect)
|
|
{
|
|
/*
|
|
* this task/thread/context/whatever is the only thing that
|
|
* removes states from the pf_state_list, so the cur reference
|
|
* it holds between calls is guaranteed to still be in the
|
|
* list.
|
|
*/
|
|
static struct pf_state *cur = NULL;
|
|
|
|
struct pf_state *head, *tail;
|
|
struct pf_state *st;
|
|
SLIST_HEAD(pf_state_gcl, pf_state) gcl = SLIST_HEAD_INITIALIZER(gcl);
|
|
time_t now;
|
|
unsigned int scanned;
|
|
unsigned int collected = 0;
|
|
|
|
PF_ASSERT_UNLOCKED();
|
|
|
|
rw_enter_read(&pf_state_list.pfs_rwl);
|
|
|
|
mtx_enter(&pf_state_list.pfs_mtx);
|
|
head = TAILQ_FIRST(&pf_state_list.pfs_list);
|
|
tail = TAILQ_LAST(&pf_state_list.pfs_list, pf_state_queue);
|
|
mtx_leave(&pf_state_list.pfs_mtx);
|
|
|
|
if (head == NULL) {
|
|
/* the list is empty */
|
|
rw_exit_read(&pf_state_list.pfs_rwl);
|
|
return (limit);
|
|
}
|
|
|
|
/* (re)start at the front of the list */
|
|
if (cur == NULL)
|
|
cur = head;
|
|
|
|
now = getuptime();
|
|
|
|
for (scanned = 0; scanned < limit; scanned++) {
|
|
uint8_t stimeout = cur->timeout;
|
|
unsigned int limited = 0;
|
|
|
|
if ((stimeout == PFTM_UNLINKED) ||
|
|
(pf_state_expires(cur, stimeout) <= now)) {
|
|
st = pf_state_ref(cur);
|
|
SLIST_INSERT_HEAD(&gcl, st, gc_list);
|
|
|
|
if (++collected >= collect)
|
|
limited = 1;
|
|
}
|
|
|
|
/* don't iterate past the end of our view of the list */
|
|
if (cur == tail) {
|
|
cur = NULL;
|
|
break;
|
|
}
|
|
|
|
cur = TAILQ_NEXT(cur, entry_list);
|
|
|
|
/* don't spend too much time here. */
|
|
if (ISSET(READ_ONCE(curcpu()->ci_schedstate.spc_schedflags),
|
|
SPCF_SHOULDYIELD) || limited)
|
|
break;
|
|
}
|
|
|
|
rw_exit_read(&pf_state_list.pfs_rwl);
|
|
|
|
if (SLIST_EMPTY(&gcl))
|
|
return (scanned);
|
|
|
|
rw_enter_write(&pf_state_list.pfs_rwl);
|
|
PF_LOCK();
|
|
PF_STATE_ENTER_WRITE();
|
|
SLIST_FOREACH(st, &gcl, gc_list) {
|
|
if (st->timeout != PFTM_UNLINKED)
|
|
pf_remove_state(st);
|
|
|
|
pf_free_state(st);
|
|
}
|
|
PF_STATE_EXIT_WRITE();
|
|
PF_UNLOCK();
|
|
rw_exit_write(&pf_state_list.pfs_rwl);
|
|
|
|
while ((st = SLIST_FIRST(&gcl)) != NULL) {
|
|
SLIST_REMOVE_HEAD(&gcl, gc_list);
|
|
pf_state_unref(st);
|
|
}
|
|
|
|
return (scanned);
|
|
}
|
|
|
|
int
|
|
pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw, int wait)
|
|
{
|
|
if (aw->type != PF_ADDR_TABLE)
|
|
return (0);
|
|
if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname, wait)) == NULL)
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
pf_tbladdr_remove(struct pf_addr_wrap *aw)
|
|
{
|
|
if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
|
|
return;
|
|
pfr_detach_table(aw->p.tbl);
|
|
aw->p.tbl = NULL;
|
|
}
|
|
|
|
void
|
|
pf_tbladdr_copyout(struct pf_addr_wrap *aw)
|
|
{
|
|
struct pfr_ktable *kt = aw->p.tbl;
|
|
|
|
if (aw->type != PF_ADDR_TABLE || kt == NULL)
|
|
return;
|
|
if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
|
|
kt = kt->pfrkt_root;
|
|
aw->p.tbl = NULL;
|
|
aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
|
|
kt->pfrkt_cnt : -1;
|
|
}
|
|
|
|
void
|
|
pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
|
|
{
|
|
switch (af) {
|
|
case AF_INET: {
|
|
u_int32_t a = ntohl(addr->addr32[0]);
|
|
addlog("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
|
|
(a>>8)&255, a&255);
|
|
if (p) {
|
|
p = ntohs(p);
|
|
addlog(":%u", p);
|
|
}
|
|
break;
|
|
}
|
|
#ifdef INET6
|
|
case AF_INET6: {
|
|
u_int16_t b;
|
|
u_int8_t i, curstart, curend, maxstart, maxend;
|
|
curstart = curend = maxstart = maxend = 255;
|
|
for (i = 0; i < 8; i++) {
|
|
if (!addr->addr16[i]) {
|
|
if (curstart == 255)
|
|
curstart = i;
|
|
curend = i;
|
|
} else {
|
|
if ((curend - curstart) >
|
|
(maxend - maxstart)) {
|
|
maxstart = curstart;
|
|
maxend = curend;
|
|
}
|
|
curstart = curend = 255;
|
|
}
|
|
}
|
|
if ((curend - curstart) >
|
|
(maxend - maxstart)) {
|
|
maxstart = curstart;
|
|
maxend = curend;
|
|
}
|
|
for (i = 0; i < 8; i++) {
|
|
if (i >= maxstart && i <= maxend) {
|
|
if (i == 0)
|
|
addlog(":");
|
|
if (i == maxend)
|
|
addlog(":");
|
|
} else {
|
|
b = ntohs(addr->addr16[i]);
|
|
addlog("%x", b);
|
|
if (i < 7)
|
|
addlog(":");
|
|
}
|
|
}
|
|
if (p) {
|
|
p = ntohs(p);
|
|
addlog("[%u]", p);
|
|
}
|
|
break;
|
|
}
|
|
#endif /* INET6 */
|
|
}
|
|
}
|
|
|
|
void
|
|
pf_print_state(struct pf_state *st)
|
|
{
|
|
pf_print_state_parts(st, NULL, NULL);
|
|
}
|
|
|
|
void
|
|
pf_print_state_parts(struct pf_state *st,
|
|
struct pf_state_key *skwp, struct pf_state_key *sksp)
|
|
{
|
|
struct pf_state_key *skw, *sks;
|
|
u_int8_t proto, dir;
|
|
|
|
/* Do our best to fill these, but they're skipped if NULL */
|
|
skw = skwp ? skwp : (st ? st->key[PF_SK_WIRE] : NULL);
|
|
sks = sksp ? sksp : (st ? st->key[PF_SK_STACK] : NULL);
|
|
proto = skw ? skw->proto : (sks ? sks->proto : 0);
|
|
dir = st ? st->direction : 0;
|
|
|
|
switch (proto) {
|
|
case IPPROTO_IPV4:
|
|
addlog("IPv4");
|
|
break;
|
|
case IPPROTO_IPV6:
|
|
addlog("IPv6");
|
|
break;
|
|
case IPPROTO_TCP:
|
|
addlog("TCP");
|
|
break;
|
|
case IPPROTO_UDP:
|
|
addlog("UDP");
|
|
break;
|
|
case IPPROTO_ICMP:
|
|
addlog("ICMP");
|
|
break;
|
|
case IPPROTO_ICMPV6:
|
|
addlog("ICMPv6");
|
|
break;
|
|
default:
|
|
addlog("%u", proto);
|
|
break;
|
|
}
|
|
switch (dir) {
|
|
case PF_IN:
|
|
addlog(" in");
|
|
break;
|
|
case PF_OUT:
|
|
addlog(" out");
|
|
break;
|
|
}
|
|
if (skw) {
|
|
addlog(" wire: (%d) ", skw->rdomain);
|
|
pf_print_host(&skw->addr[0], skw->port[0], skw->af);
|
|
addlog(" ");
|
|
pf_print_host(&skw->addr[1], skw->port[1], skw->af);
|
|
}
|
|
if (sks) {
|
|
addlog(" stack: (%d) ", sks->rdomain);
|
|
if (sks != skw) {
|
|
pf_print_host(&sks->addr[0], sks->port[0], sks->af);
|
|
addlog(" ");
|
|
pf_print_host(&sks->addr[1], sks->port[1], sks->af);
|
|
} else
|
|
addlog("-");
|
|
}
|
|
if (st) {
|
|
if (proto == IPPROTO_TCP) {
|
|
addlog(" [lo=%u high=%u win=%u modulator=%u",
|
|
st->src.seqlo, st->src.seqhi,
|
|
st->src.max_win, st->src.seqdiff);
|
|
if (st->src.wscale && st->dst.wscale)
|
|
addlog(" wscale=%u",
|
|
st->src.wscale & PF_WSCALE_MASK);
|
|
addlog("]");
|
|
addlog(" [lo=%u high=%u win=%u modulator=%u",
|
|
st->dst.seqlo, st->dst.seqhi,
|
|
st->dst.max_win, st->dst.seqdiff);
|
|
if (st->src.wscale && st->dst.wscale)
|
|
addlog(" wscale=%u",
|
|
st->dst.wscale & PF_WSCALE_MASK);
|
|
addlog("]");
|
|
}
|
|
addlog(" %u:%u", st->src.state, st->dst.state);
|
|
if (st->rule.ptr)
|
|
addlog(" @%d", st->rule.ptr->nr);
|
|
}
|
|
}
|
|
|
|
void
|
|
pf_print_flags(u_int8_t f)
|
|
{
|
|
if (f)
|
|
addlog(" ");
|
|
if (f & TH_FIN)
|
|
addlog("F");
|
|
if (f & TH_SYN)
|
|
addlog("S");
|
|
if (f & TH_RST)
|
|
addlog("R");
|
|
if (f & TH_PUSH)
|
|
addlog("P");
|
|
if (f & TH_ACK)
|
|
addlog("A");
|
|
if (f & TH_URG)
|
|
addlog("U");
|
|
if (f & TH_ECE)
|
|
addlog("E");
|
|
if (f & TH_CWR)
|
|
addlog("W");
|
|
}
|
|
|
|
#define PF_SET_SKIP_STEPS(i) \
|
|
do { \
|
|
while (head[i] != cur) { \
|
|
head[i]->skip[i].ptr = cur; \
|
|
head[i] = TAILQ_NEXT(head[i], entries); \
|
|
} \
|
|
} while (0)
|
|
|
|
void
|
|
pf_calc_skip_steps(struct pf_rulequeue *rules)
|
|
{
|
|
struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
|
|
int i;
|
|
|
|
cur = TAILQ_FIRST(rules);
|
|
prev = cur;
|
|
for (i = 0; i < PF_SKIP_COUNT; ++i)
|
|
head[i] = cur;
|
|
while (cur != NULL) {
|
|
if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
|
|
PF_SET_SKIP_STEPS(PF_SKIP_IFP);
|
|
if (cur->direction != prev->direction)
|
|
PF_SET_SKIP_STEPS(PF_SKIP_DIR);
|
|
if (cur->onrdomain != prev->onrdomain ||
|
|
cur->ifnot != prev->ifnot)
|
|
PF_SET_SKIP_STEPS(PF_SKIP_RDOM);
|
|
if (cur->af != prev->af)
|
|
PF_SET_SKIP_STEPS(PF_SKIP_AF);
|
|
if (cur->proto != prev->proto)
|
|
PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
|
|
if (cur->src.neg != prev->src.neg ||
|
|
pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
|
|
PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
|
|
if (cur->dst.neg != prev->dst.neg ||
|
|
pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
|
|
PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
|
|
if (cur->src.port[0] != prev->src.port[0] ||
|
|
cur->src.port[1] != prev->src.port[1] ||
|
|
cur->src.port_op != prev->src.port_op)
|
|
PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
|
|
if (cur->dst.port[0] != prev->dst.port[0] ||
|
|
cur->dst.port[1] != prev->dst.port[1] ||
|
|
cur->dst.port_op != prev->dst.port_op)
|
|
PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
|
|
|
|
prev = cur;
|
|
cur = TAILQ_NEXT(cur, entries);
|
|
}
|
|
for (i = 0; i < PF_SKIP_COUNT; ++i)
|
|
PF_SET_SKIP_STEPS(i);
|
|
}
|
|
|
|
int
|
|
pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
|
|
{
|
|
if (aw1->type != aw2->type)
|
|
return (1);
|
|
switch (aw1->type) {
|
|
case PF_ADDR_ADDRMASK:
|
|
case PF_ADDR_RANGE:
|
|
if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6))
|
|
return (1);
|
|
if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6))
|
|
return (1);
|
|
return (0);
|
|
case PF_ADDR_DYNIFTL:
|
|
return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
|
|
case PF_ADDR_NONE:
|
|
case PF_ADDR_NOROUTE:
|
|
case PF_ADDR_URPFFAILED:
|
|
return (0);
|
|
case PF_ADDR_TABLE:
|
|
return (aw1->p.tbl != aw2->p.tbl);
|
|
case PF_ADDR_RTLABEL:
|
|
return (aw1->v.rtlabel != aw2->v.rtlabel);
|
|
default:
|
|
addlog("invalid address type: %d\n", aw1->type);
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
/* This algorithm computes 'a + b - c' in ones-complement using a trick to
|
|
* emulate at most one ones-complement subtraction. This thereby limits net
|
|
* carries/borrows to at most one, eliminating a reduction step and saving one
|
|
* each of +, >>, & and ~.
|
|
*
|
|
* def. x mod y = x - (x//y)*y for integer x,y
|
|
* def. sum = x mod 2^16
|
|
* def. accumulator = (x >> 16) mod 2^16
|
|
*
|
|
* The trick works as follows: subtracting exactly one u_int16_t from the
|
|
* u_int32_t x incurs at most one underflow, wrapping its upper 16-bits, the
|
|
* accumulator, to 2^16 - 1. Adding this to the 16-bit sum preserves the
|
|
* ones-complement borrow:
|
|
*
|
|
* (sum + accumulator) mod 2^16
|
|
* = { assume underflow: accumulator := 2^16 - 1 }
|
|
* (sum + 2^16 - 1) mod 2^16
|
|
* = { mod }
|
|
* (sum - 1) mod 2^16
|
|
*
|
|
* Although this breaks for sum = 0, giving 0xffff, which is ones-complement's
|
|
* other zero, not -1, that cannot occur: the 16-bit sum cannot be underflown
|
|
* to zero as that requires subtraction of at least 2^16, which exceeds a
|
|
* single u_int16_t's range.
|
|
*
|
|
* We use the following theorem to derive the implementation:
|
|
*
|
|
* th. (x + (y mod z)) mod z = (x + y) mod z (0)
|
|
* proof.
|
|
* (x + (y mod z)) mod z
|
|
* = { def mod }
|
|
* (x + y - (y//z)*z) mod z
|
|
* = { (a + b*c) mod c = a mod c }
|
|
* (x + y) mod z [end of proof]
|
|
*
|
|
* ... and thereby obtain:
|
|
*
|
|
* (sum + accumulator) mod 2^16
|
|
* = { def. accumulator, def. sum }
|
|
* (x mod 2^16 + (x >> 16) mod 2^16) mod 2^16
|
|
* = { (0), twice }
|
|
* (x + (x >> 16)) mod 2^16
|
|
* = { x mod 2^n = x & (2^n - 1) }
|
|
* (x + (x >> 16)) & 0xffff
|
|
*
|
|
* Note: this serves also as a reduction step for at most one add (as the
|
|
* trailing mod 2^16 prevents further reductions by destroying carries).
|
|
*/
|
|
__inline void
|
|
pf_cksum_fixup(u_int16_t *cksum, u_int16_t was, u_int16_t now,
|
|
u_int8_t proto)
|
|
{
|
|
u_int32_t x;
|
|
const int udp = proto == IPPROTO_UDP;
|
|
|
|
x = *cksum + was - now;
|
|
x = (x + (x >> 16)) & 0xffff;
|
|
|
|
/* optimise: eliminate a branch when not udp */
|
|
if (udp && *cksum == 0x0000)
|
|
return;
|
|
if (udp && x == 0x0000)
|
|
x = 0xffff;
|
|
|
|
*cksum = (u_int16_t)(x);
|
|
}
|
|
|
|
#ifdef INET6
|
|
/* pre: coverage(cksum) is superset of coverage(covered_cksum) */
|
|
static __inline void
|
|
pf_cksum_uncover(u_int16_t *cksum, u_int16_t covered_cksum, u_int8_t proto)
|
|
{
|
|
pf_cksum_fixup(cksum, ~covered_cksum, 0x0, proto);
|
|
}
|
|
|
|
/* pre: disjoint(coverage(cksum), coverage(uncovered_cksum)) */
|
|
static __inline void
|
|
pf_cksum_cover(u_int16_t *cksum, u_int16_t uncovered_cksum, u_int8_t proto)
|
|
{
|
|
pf_cksum_fixup(cksum, 0x0, ~uncovered_cksum, proto);
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
/* pre: *a is 16-bit aligned within its packet
|
|
*
|
|
* This algorithm emulates 16-bit ones-complement sums on a twos-complement
|
|
* machine by conserving ones-complement's otherwise discarded carries in the
|
|
* upper bits of x. These accumulated carries when added to the lower 16-bits
|
|
* over at least zero 'reduction' steps then complete the ones-complement sum.
|
|
*
|
|
* def. sum = x mod 2^16
|
|
* def. accumulator = (x >> 16)
|
|
*
|
|
* At most two reduction steps
|
|
*
|
|
* x := sum + accumulator
|
|
* = { def sum, def accumulator }
|
|
* x := x mod 2^16 + (x >> 16)
|
|
* = { x mod 2^n = x & (2^n - 1) }
|
|
* x := (x & 0xffff) + (x >> 16)
|
|
*
|
|
* are necessary to incorporate the accumulated carries (at most one per add)
|
|
* i.e. to reduce x < 2^16 from at most 16 carries in the upper 16 bits.
|
|
*
|
|
* The function is also invariant over the endian of the host. Why?
|
|
*
|
|
* Define the unary transpose operator ~ on a bitstring in python slice
|
|
* notation as lambda m: m[P:] + m[:P] , for some constant pivot P.
|
|
*
|
|
* th. ~ distributes over ones-complement addition, denoted by +_1, i.e.
|
|
*
|
|
* ~m +_1 ~n = ~(m +_1 n) (for all bitstrings m,n of equal length)
|
|
*
|
|
* proof. Regard the bitstrings in m +_1 n as split at P, forming at most two
|
|
* 'half-adds'. Under ones-complement addition, each half-add carries to the
|
|
* other, so the sum of each half-add is unaffected by their relative
|
|
* order. Therefore:
|
|
*
|
|
* ~m +_1 ~n
|
|
* = { half-adds invariant under transposition }
|
|
* ~s
|
|
* = { substitute }
|
|
* ~(m +_1 n) [end of proof]
|
|
*
|
|
* th. Summing two in-memory ones-complement 16-bit variables m,n on a machine
|
|
* with the converse endian does not alter the result.
|
|
*
|
|
* proof.
|
|
* { converse machine endian: load/store transposes, P := 8 }
|
|
* ~(~m +_1 ~n)
|
|
* = { ~ over +_1 }
|
|
* ~~m +_1 ~~n
|
|
* = { ~ is an involution }
|
|
* m +_1 n [end of proof]
|
|
*
|
|
*/
|
|
#define NEG(x) ((u_int16_t)~(x))
|
|
void
|
|
pf_cksum_fixup_a(u_int16_t *cksum, const struct pf_addr *a,
|
|
const struct pf_addr *an, sa_family_t af, u_int8_t proto)
|
|
{
|
|
u_int32_t x;
|
|
const u_int16_t *n = an->addr16;
|
|
const u_int16_t *o = a->addr16;
|
|
const int udp = proto == IPPROTO_UDP;
|
|
|
|
switch (af) {
|
|
case AF_INET:
|
|
x = *cksum + o[0] + NEG(n[0]) + o[1] + NEG(n[1]);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
x = *cksum + o[0] + NEG(n[0]) + o[1] + NEG(n[1]) +\
|
|
o[2] + NEG(n[2]) + o[3] + NEG(n[3]) +\
|
|
o[4] + NEG(n[4]) + o[5] + NEG(n[5]) +\
|
|
o[6] + NEG(n[6]) + o[7] + NEG(n[7]);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
unhandled_af(af);
|
|
}
|
|
|
|
x = (x & 0xffff) + (x >> 16);
|
|
x = (x & 0xffff) + (x >> 16);
|
|
|
|
/* optimise: eliminate a branch when not udp */
|
|
if (udp && *cksum == 0x0000)
|
|
return;
|
|
if (udp && x == 0x0000)
|
|
x = 0xffff;
|
|
|
|
*cksum = (u_int16_t)(x);
|
|
}
|
|
|
|
int
|
|
pf_patch_8(struct pf_pdesc *pd, u_int8_t *f, u_int8_t v, bool hi)
|
|
{
|
|
int rewrite = 0;
|
|
|
|
if (*f != v) {
|
|
u_int16_t old = htons(hi ? (*f << 8) : *f);
|
|
u_int16_t new = htons(hi ? ( v << 8) : v);
|
|
|
|
pf_cksum_fixup(pd->pcksum, old, new, pd->proto);
|
|
*f = v;
|
|
rewrite = 1;
|
|
}
|
|
|
|
return (rewrite);
|
|
}
|
|
|
|
/* pre: *f is 16-bit aligned within its packet */
|
|
int
|
|
pf_patch_16(struct pf_pdesc *pd, u_int16_t *f, u_int16_t v)
|
|
{
|
|
int rewrite = 0;
|
|
|
|
if (*f != v) {
|
|
pf_cksum_fixup(pd->pcksum, *f, v, pd->proto);
|
|
*f = v;
|
|
rewrite = 1;
|
|
}
|
|
|
|
return (rewrite);
|
|
}
|
|
|
|
int
|
|
pf_patch_16_unaligned(struct pf_pdesc *pd, void *f, u_int16_t v, bool hi)
|
|
{
|
|
int rewrite = 0;
|
|
u_int8_t *fb = (u_int8_t*)f;
|
|
u_int8_t *vb = (u_int8_t*)&v;
|
|
|
|
if (hi && ALIGNED_POINTER(f, u_int16_t)) {
|
|
return (pf_patch_16(pd, f, v)); /* optimise */
|
|
}
|
|
|
|
rewrite += pf_patch_8(pd, fb++, *vb++, hi);
|
|
rewrite += pf_patch_8(pd, fb++, *vb++,!hi);
|
|
|
|
return (rewrite);
|
|
}
|
|
|
|
/* pre: *f is 16-bit aligned within its packet */
|
|
/* pre: pd->proto != IPPROTO_UDP */
|
|
int
|
|
pf_patch_32(struct pf_pdesc *pd, u_int32_t *f, u_int32_t v)
|
|
{
|
|
int rewrite = 0;
|
|
u_int16_t *pc = pd->pcksum;
|
|
u_int8_t proto = pd->proto;
|
|
|
|
/* optimise: inline udp fixup code is unused; let compiler scrub it */
|
|
if (proto == IPPROTO_UDP)
|
|
panic("%s: udp", __func__);
|
|
|
|
/* optimise: skip *f != v guard; true for all use-cases */
|
|
pf_cksum_fixup(pc, *f / (1 << 16), v / (1 << 16), proto);
|
|
pf_cksum_fixup(pc, *f % (1 << 16), v % (1 << 16), proto);
|
|
|
|
*f = v;
|
|
rewrite = 1;
|
|
|
|
return (rewrite);
|
|
}
|
|
|
|
int
|
|
pf_patch_32_unaligned(struct pf_pdesc *pd, void *f, u_int32_t v, bool hi)
|
|
{
|
|
int rewrite = 0;
|
|
u_int8_t *fb = (u_int8_t*)f;
|
|
u_int8_t *vb = (u_int8_t*)&v;
|
|
|
|
if (hi && ALIGNED_POINTER(f, u_int32_t)) {
|
|
return (pf_patch_32(pd, f, v)); /* optimise */
|
|
}
|
|
|
|
rewrite += pf_patch_8(pd, fb++, *vb++, hi);
|
|
rewrite += pf_patch_8(pd, fb++, *vb++,!hi);
|
|
rewrite += pf_patch_8(pd, fb++, *vb++, hi);
|
|
rewrite += pf_patch_8(pd, fb++, *vb++,!hi);
|
|
|
|
return (rewrite);
|
|
}
|
|
|
|
int
|
|
pf_icmp_mapping(struct pf_pdesc *pd, u_int8_t type, int *icmp_dir,
|
|
u_int16_t *virtual_id, u_int16_t *virtual_type)
|
|
{
|
|
/*
|
|
* ICMP types marked with PF_OUT are typically responses to
|
|
* PF_IN, and will match states in the opposite direction.
|
|
* PF_IN ICMP types need to match a state with that type.
|
|
*/
|
|
*icmp_dir = PF_OUT;
|
|
|
|
/* Queries (and responses) */
|
|
switch (pd->af) {
|
|
case AF_INET:
|
|
switch (type) {
|
|
case ICMP_ECHO:
|
|
*icmp_dir = PF_IN;
|
|
/* FALLTHROUGH */
|
|
case ICMP_ECHOREPLY:
|
|
*virtual_type = ICMP_ECHO;
|
|
*virtual_id = pd->hdr.icmp.icmp_id;
|
|
break;
|
|
|
|
case ICMP_TSTAMP:
|
|
*icmp_dir = PF_IN;
|
|
/* FALLTHROUGH */
|
|
case ICMP_TSTAMPREPLY:
|
|
*virtual_type = ICMP_TSTAMP;
|
|
*virtual_id = pd->hdr.icmp.icmp_id;
|
|
break;
|
|
|
|
case ICMP_IREQ:
|
|
*icmp_dir = PF_IN;
|
|
/* FALLTHROUGH */
|
|
case ICMP_IREQREPLY:
|
|
*virtual_type = ICMP_IREQ;
|
|
*virtual_id = pd->hdr.icmp.icmp_id;
|
|
break;
|
|
|
|
case ICMP_MASKREQ:
|
|
*icmp_dir = PF_IN;
|
|
/* FALLTHROUGH */
|
|
case ICMP_MASKREPLY:
|
|
*virtual_type = ICMP_MASKREQ;
|
|
*virtual_id = pd->hdr.icmp.icmp_id;
|
|
break;
|
|
|
|
case ICMP_IPV6_WHEREAREYOU:
|
|
*icmp_dir = PF_IN;
|
|
/* FALLTHROUGH */
|
|
case ICMP_IPV6_IAMHERE:
|
|
*virtual_type = ICMP_IPV6_WHEREAREYOU;
|
|
*virtual_id = 0; /* Nothing sane to match on! */
|
|
break;
|
|
|
|
case ICMP_MOBILE_REGREQUEST:
|
|
*icmp_dir = PF_IN;
|
|
/* FALLTHROUGH */
|
|
case ICMP_MOBILE_REGREPLY:
|
|
*virtual_type = ICMP_MOBILE_REGREQUEST;
|
|
*virtual_id = 0; /* Nothing sane to match on! */
|
|
break;
|
|
|
|
case ICMP_ROUTERSOLICIT:
|
|
*icmp_dir = PF_IN;
|
|
/* FALLTHROUGH */
|
|
case ICMP_ROUTERADVERT:
|
|
*virtual_type = ICMP_ROUTERSOLICIT;
|
|
*virtual_id = 0; /* Nothing sane to match on! */
|
|
break;
|
|
|
|
/* These ICMP types map to other connections */
|
|
case ICMP_UNREACH:
|
|
case ICMP_SOURCEQUENCH:
|
|
case ICMP_REDIRECT:
|
|
case ICMP_TIMXCEED:
|
|
case ICMP_PARAMPROB:
|
|
/* These will not be used, but set them anyway */
|
|
*icmp_dir = PF_IN;
|
|
*virtual_type = htons(type);
|
|
*virtual_id = 0;
|
|
return (1); /* These types match to another state */
|
|
|
|
/*
|
|
* All remaining ICMP types get their own states,
|
|
* and will only match in one direction.
|
|
*/
|
|
default:
|
|
*icmp_dir = PF_IN;
|
|
*virtual_type = type;
|
|
*virtual_id = 0;
|
|
break;
|
|
}
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
switch (type) {
|
|
case ICMP6_ECHO_REQUEST:
|
|
*icmp_dir = PF_IN;
|
|
/* FALLTHROUGH */
|
|
case ICMP6_ECHO_REPLY:
|
|
*virtual_type = ICMP6_ECHO_REQUEST;
|
|
*virtual_id = pd->hdr.icmp6.icmp6_id;
|
|
break;
|
|
|
|
case MLD_LISTENER_QUERY:
|
|
case MLD_LISTENER_REPORT: {
|
|
struct mld_hdr *mld = &pd->hdr.mld;
|
|
u_int32_t h;
|
|
|
|
/*
|
|
* Listener Report can be sent by clients
|
|
* without an associated Listener Query.
|
|
* In addition to that, when Report is sent as a
|
|
* reply to a Query its source and destination
|
|
* address are different.
|
|
*/
|
|
*icmp_dir = PF_IN;
|
|
*virtual_type = MLD_LISTENER_QUERY;
|
|
/* generate fake id for these messages */
|
|
h = mld->mld_addr.s6_addr32[0] ^
|
|
mld->mld_addr.s6_addr32[1] ^
|
|
mld->mld_addr.s6_addr32[2] ^
|
|
mld->mld_addr.s6_addr32[3];
|
|
*virtual_id = (h >> 16) ^ (h & 0xffff);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* ICMP6_FQDN and ICMP6_NI query/reply are the same type as
|
|
* ICMP6_WRU
|
|
*/
|
|
case ICMP6_WRUREQUEST:
|
|
*icmp_dir = PF_IN;
|
|
/* FALLTHROUGH */
|
|
case ICMP6_WRUREPLY:
|
|
*virtual_type = ICMP6_WRUREQUEST;
|
|
*virtual_id = 0; /* Nothing sane to match on! */
|
|
break;
|
|
|
|
case MLD_MTRACE:
|
|
*icmp_dir = PF_IN;
|
|
/* FALLTHROUGH */
|
|
case MLD_MTRACE_RESP:
|
|
*virtual_type = MLD_MTRACE;
|
|
*virtual_id = 0; /* Nothing sane to match on! */
|
|
break;
|
|
|
|
case ND_NEIGHBOR_SOLICIT:
|
|
*icmp_dir = PF_IN;
|
|
/* FALLTHROUGH */
|
|
case ND_NEIGHBOR_ADVERT: {
|
|
struct nd_neighbor_solicit *nd = &pd->hdr.nd_ns;
|
|
u_int32_t h;
|
|
|
|
*virtual_type = ND_NEIGHBOR_SOLICIT;
|
|
/* generate fake id for these messages */
|
|
h = nd->nd_ns_target.s6_addr32[0] ^
|
|
nd->nd_ns_target.s6_addr32[1] ^
|
|
nd->nd_ns_target.s6_addr32[2] ^
|
|
nd->nd_ns_target.s6_addr32[3];
|
|
*virtual_id = (h >> 16) ^ (h & 0xffff);
|
|
/*
|
|
* the extra work here deals with 'keep state' option
|
|
* at pass rule for unsolicited advertisement. By
|
|
* returning 1 (state_icmp = 1) we override 'keep
|
|
* state' to 'no state' so we don't create state for
|
|
* unsolicited advertisements. No one expects answer to
|
|
* unsolicited advertisements so we should be good.
|
|
*/
|
|
if (type == ND_NEIGHBOR_ADVERT) {
|
|
*virtual_type = htons(*virtual_type);
|
|
return (1);
|
|
}
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* These ICMP types map to other connections.
|
|
* ND_REDIRECT can't be in this list because the triggering
|
|
* packet header is optional.
|
|
*/
|
|
case ICMP6_DST_UNREACH:
|
|
case ICMP6_PACKET_TOO_BIG:
|
|
case ICMP6_TIME_EXCEEDED:
|
|
case ICMP6_PARAM_PROB:
|
|
/* These will not be used, but set them anyway */
|
|
*icmp_dir = PF_IN;
|
|
*virtual_type = htons(type);
|
|
*virtual_id = 0;
|
|
return (1); /* These types match to another state */
|
|
/*
|
|
* All remaining ICMP6 types get their own states,
|
|
* and will only match in one direction.
|
|
*/
|
|
default:
|
|
*icmp_dir = PF_IN;
|
|
*virtual_type = type;
|
|
*virtual_id = 0;
|
|
break;
|
|
}
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
*virtual_type = htons(*virtual_type);
|
|
return (0); /* These types match to their own state */
|
|
}
|
|
|
|
void
|
|
pf_translate_icmp(struct pf_pdesc *pd, struct pf_addr *qa, u_int16_t *qp,
|
|
struct pf_addr *oa, struct pf_addr *na, u_int16_t np)
|
|
{
|
|
/* note: doesn't trouble to fixup quoted checksums, if any */
|
|
|
|
/* change quoted protocol port */
|
|
if (qp != NULL)
|
|
pf_patch_16(pd, qp, np);
|
|
|
|
/* change quoted ip address */
|
|
pf_cksum_fixup_a(pd->pcksum, qa, na, pd->af, pd->proto);
|
|
pf_addrcpy(qa, na, pd->af);
|
|
|
|
/* change network-header's ip address */
|
|
if (oa)
|
|
pf_translate_a(pd, oa, na);
|
|
}
|
|
|
|
/* pre: *a is 16-bit aligned within its packet */
|
|
/* *a is a network header src/dst address */
|
|
int
|
|
pf_translate_a(struct pf_pdesc *pd, struct pf_addr *a, struct pf_addr *an)
|
|
{
|
|
int rewrite = 0;
|
|
|
|
/* warning: !PF_ANEQ != PF_AEQ */
|
|
if (!PF_ANEQ(a, an, pd->af))
|
|
return (0);
|
|
|
|
/* fixup transport pseudo-header, if any */
|
|
switch (pd->proto) {
|
|
case IPPROTO_TCP: /* FALLTHROUGH */
|
|
case IPPROTO_UDP: /* FALLTHROUGH */
|
|
case IPPROTO_ICMPV6:
|
|
pf_cksum_fixup_a(pd->pcksum, a, an, pd->af, pd->proto);
|
|
break;
|
|
default:
|
|
break; /* assume no pseudo-header */
|
|
}
|
|
|
|
pf_addrcpy(a, an, pd->af);
|
|
rewrite = 1;
|
|
|
|
return (rewrite);
|
|
}
|
|
|
|
#ifdef INET6
|
|
/* pf_translate_af() may change pd->m, adjust local copies after calling */
|
|
int
|
|
pf_translate_af(struct pf_pdesc *pd)
|
|
{
|
|
static const struct pf_addr zero;
|
|
struct ip *ip4;
|
|
struct ip6_hdr *ip6;
|
|
int copyback = 0;
|
|
u_int hlen, ohlen, dlen;
|
|
u_int16_t *pc;
|
|
u_int8_t af_proto, naf_proto;
|
|
|
|
hlen = (pd->naf == AF_INET) ? sizeof(*ip4) : sizeof(*ip6);
|
|
ohlen = pd->off;
|
|
dlen = pd->tot_len - pd->off;
|
|
pc = pd->pcksum;
|
|
|
|
af_proto = naf_proto = pd->proto;
|
|
if (naf_proto == IPPROTO_ICMP)
|
|
af_proto = IPPROTO_ICMPV6;
|
|
if (naf_proto == IPPROTO_ICMPV6)
|
|
af_proto = IPPROTO_ICMP;
|
|
|
|
/* uncover stale pseudo-header */
|
|
switch (af_proto) {
|
|
case IPPROTO_ICMPV6:
|
|
/* optimise: unchanged for TCP/UDP */
|
|
pf_cksum_fixup(pc, htons(af_proto), 0x0, af_proto);
|
|
pf_cksum_fixup(pc, htons(dlen), 0x0, af_proto);
|
|
/* FALLTHROUGH */
|
|
case IPPROTO_UDP: /* FALLTHROUGH */
|
|
case IPPROTO_TCP:
|
|
pf_cksum_fixup_a(pc, pd->src, &zero, pd->af, af_proto);
|
|
pf_cksum_fixup_a(pc, pd->dst, &zero, pd->af, af_proto);
|
|
copyback = 1;
|
|
break;
|
|
default:
|
|
break; /* assume no pseudo-header */
|
|
}
|
|
|
|
/* replace the network header */
|
|
m_adj(pd->m, pd->off);
|
|
pd->src = NULL;
|
|
pd->dst = NULL;
|
|
|
|
if ((M_PREPEND(pd->m, hlen, M_DONTWAIT)) == NULL) {
|
|
pd->m = NULL;
|
|
return (-1);
|
|
}
|
|
|
|
pd->off = hlen;
|
|
pd->tot_len += hlen - ohlen;
|
|
|
|
switch (pd->naf) {
|
|
case AF_INET:
|
|
ip4 = mtod(pd->m, struct ip *);
|
|
memset(ip4, 0, hlen);
|
|
ip4->ip_v = IPVERSION;
|
|
ip4->ip_hl = hlen >> 2;
|
|
ip4->ip_tos = pd->tos;
|
|
ip4->ip_len = htons(hlen + dlen);
|
|
ip4->ip_id = htons(ip_randomid());
|
|
ip4->ip_off = htons(IP_DF);
|
|
ip4->ip_ttl = pd->ttl;
|
|
ip4->ip_p = pd->proto;
|
|
ip4->ip_src = pd->nsaddr.v4;
|
|
ip4->ip_dst = pd->ndaddr.v4;
|
|
break;
|
|
case AF_INET6:
|
|
ip6 = mtod(pd->m, struct ip6_hdr *);
|
|
memset(ip6, 0, hlen);
|
|
ip6->ip6_vfc = IPV6_VERSION;
|
|
ip6->ip6_flow |= htonl((u_int32_t)pd->tos << 20);
|
|
ip6->ip6_plen = htons(dlen);
|
|
ip6->ip6_nxt = pd->proto;
|
|
if (!pd->ttl || pd->ttl > IPV6_DEFHLIM)
|
|
ip6->ip6_hlim = IPV6_DEFHLIM;
|
|
else
|
|
ip6->ip6_hlim = pd->ttl;
|
|
ip6->ip6_src = pd->nsaddr.v6;
|
|
ip6->ip6_dst = pd->ndaddr.v6;
|
|
break;
|
|
default:
|
|
unhandled_af(pd->naf);
|
|
}
|
|
|
|
/* UDP over IPv6 must be checksummed per rfc2460 p27 */
|
|
if (naf_proto == IPPROTO_UDP && *pc == 0x0000 &&
|
|
pd->naf == AF_INET6) {
|
|
pd->m->m_pkthdr.csum_flags |= M_UDP_CSUM_OUT;
|
|
}
|
|
|
|
/* cover fresh pseudo-header */
|
|
switch (naf_proto) {
|
|
case IPPROTO_ICMPV6:
|
|
/* optimise: unchanged for TCP/UDP */
|
|
pf_cksum_fixup(pc, 0x0, htons(naf_proto), naf_proto);
|
|
pf_cksum_fixup(pc, 0x0, htons(dlen), naf_proto);
|
|
/* FALLTHROUGH */
|
|
case IPPROTO_UDP: /* FALLTHROUGH */
|
|
case IPPROTO_TCP:
|
|
pf_cksum_fixup_a(pc, &zero, &pd->nsaddr, pd->naf, naf_proto);
|
|
pf_cksum_fixup_a(pc, &zero, &pd->ndaddr, pd->naf, naf_proto);
|
|
copyback = 1;
|
|
break;
|
|
default:
|
|
break; /* assume no pseudo-header */
|
|
}
|
|
|
|
/* flush pd->pcksum */
|
|
if (copyback)
|
|
m_copyback(pd->m, pd->off, pd->hdrlen, &pd->hdr, M_NOWAIT);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
pf_change_icmp_af(struct mbuf *m, int ipoff2, struct pf_pdesc *pd,
|
|
struct pf_pdesc *pd2, struct pf_addr *src, struct pf_addr *dst,
|
|
sa_family_t af, sa_family_t naf)
|
|
{
|
|
struct mbuf *n = NULL;
|
|
struct ip *ip4;
|
|
struct ip6_hdr *ip6;
|
|
u_int hlen, ohlen, dlen;
|
|
int d;
|
|
|
|
if (af == naf || (af != AF_INET && af != AF_INET6) ||
|
|
(naf != AF_INET && naf != AF_INET6))
|
|
return (-1);
|
|
|
|
/* split the mbuf chain on the quoted ip/ip6 header boundary */
|
|
if ((n = m_split(m, ipoff2, M_DONTWAIT)) == NULL)
|
|
return (-1);
|
|
|
|
/* new quoted header */
|
|
hlen = naf == AF_INET ? sizeof(*ip4) : sizeof(*ip6);
|
|
/* old quoted header */
|
|
ohlen = pd2->off - ipoff2;
|
|
|
|
/* trim old quoted header */
|
|
pf_cksum_uncover(pd->pcksum, in_cksum(n, ohlen), pd->proto);
|
|
m_adj(n, ohlen);
|
|
|
|
/* prepend a new, translated, quoted header */
|
|
if ((M_PREPEND(n, hlen, M_DONTWAIT)) == NULL)
|
|
return (-1);
|
|
|
|
switch (naf) {
|
|
case AF_INET:
|
|
ip4 = mtod(n, struct ip *);
|
|
memset(ip4, 0, sizeof(*ip4));
|
|
ip4->ip_v = IPVERSION;
|
|
ip4->ip_hl = sizeof(*ip4) >> 2;
|
|
ip4->ip_len = htons(sizeof(*ip4) + pd2->tot_len - ohlen);
|
|
ip4->ip_id = htons(ip_randomid());
|
|
ip4->ip_off = htons(IP_DF);
|
|
ip4->ip_ttl = pd2->ttl;
|
|
if (pd2->proto == IPPROTO_ICMPV6)
|
|
ip4->ip_p = IPPROTO_ICMP;
|
|
else
|
|
ip4->ip_p = pd2->proto;
|
|
ip4->ip_src = src->v4;
|
|
ip4->ip_dst = dst->v4;
|
|
in_hdr_cksum_out(n, NULL);
|
|
break;
|
|
case AF_INET6:
|
|
ip6 = mtod(n, struct ip6_hdr *);
|
|
memset(ip6, 0, sizeof(*ip6));
|
|
ip6->ip6_vfc = IPV6_VERSION;
|
|
ip6->ip6_plen = htons(pd2->tot_len - ohlen);
|
|
if (pd2->proto == IPPROTO_ICMP)
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
|
else
|
|
ip6->ip6_nxt = pd2->proto;
|
|
if (!pd2->ttl || pd2->ttl > IPV6_DEFHLIM)
|
|
ip6->ip6_hlim = IPV6_DEFHLIM;
|
|
else
|
|
ip6->ip6_hlim = pd2->ttl;
|
|
ip6->ip6_src = src->v6;
|
|
ip6->ip6_dst = dst->v6;
|
|
break;
|
|
}
|
|
|
|
/* cover new quoted header */
|
|
/* optimise: any new AF_INET header of ours sums to zero */
|
|
if (naf != AF_INET) {
|
|
pf_cksum_cover(pd->pcksum, in_cksum(n, hlen), pd->proto);
|
|
}
|
|
|
|
/* reattach modified quoted packet to outer header */
|
|
{
|
|
int nlen = n->m_pkthdr.len;
|
|
m_cat(m, n);
|
|
m->m_pkthdr.len += nlen;
|
|
}
|
|
|
|
/* account for altered length */
|
|
d = hlen - ohlen;
|
|
|
|
if (pd->proto == IPPROTO_ICMPV6) {
|
|
/* fixup pseudo-header */
|
|
dlen = pd->tot_len - pd->off;
|
|
pf_cksum_fixup(pd->pcksum,
|
|
htons(dlen), htons(dlen + d), pd->proto);
|
|
}
|
|
|
|
pd->tot_len += d;
|
|
pd2->tot_len += d;
|
|
pd2->off += d;
|
|
|
|
/* note: not bothering to update network headers as
|
|
these due for rewrite by pf_translate_af() */
|
|
|
|
return (0);
|
|
}
|
|
|
|
|
|
#define PTR_IP(field) (offsetof(struct ip, field))
|
|
#define PTR_IP6(field) (offsetof(struct ip6_hdr, field))
|
|
|
|
int
|
|
pf_translate_icmp_af(struct pf_pdesc *pd, int af, void *arg)
|
|
{
|
|
struct icmp *icmp4;
|
|
struct icmp6_hdr *icmp6;
|
|
u_int32_t mtu;
|
|
int32_t ptr = -1;
|
|
u_int8_t type;
|
|
u_int8_t code;
|
|
|
|
switch (af) {
|
|
case AF_INET:
|
|
icmp6 = arg;
|
|
type = icmp6->icmp6_type;
|
|
code = icmp6->icmp6_code;
|
|
mtu = ntohl(icmp6->icmp6_mtu);
|
|
|
|
switch (type) {
|
|
case ICMP6_ECHO_REQUEST:
|
|
type = ICMP_ECHO;
|
|
break;
|
|
case ICMP6_ECHO_REPLY:
|
|
type = ICMP_ECHOREPLY;
|
|
break;
|
|
case ICMP6_DST_UNREACH:
|
|
type = ICMP_UNREACH;
|
|
switch (code) {
|
|
case ICMP6_DST_UNREACH_NOROUTE:
|
|
case ICMP6_DST_UNREACH_BEYONDSCOPE:
|
|
case ICMP6_DST_UNREACH_ADDR:
|
|
code = ICMP_UNREACH_HOST;
|
|
break;
|
|
case ICMP6_DST_UNREACH_ADMIN:
|
|
code = ICMP_UNREACH_HOST_PROHIB;
|
|
break;
|
|
case ICMP6_DST_UNREACH_NOPORT:
|
|
code = ICMP_UNREACH_PORT;
|
|
break;
|
|
default:
|
|
return (-1);
|
|
}
|
|
break;
|
|
case ICMP6_PACKET_TOO_BIG:
|
|
type = ICMP_UNREACH;
|
|
code = ICMP_UNREACH_NEEDFRAG;
|
|
mtu -= 20;
|
|
break;
|
|
case ICMP6_TIME_EXCEEDED:
|
|
type = ICMP_TIMXCEED;
|
|
break;
|
|
case ICMP6_PARAM_PROB:
|
|
switch (code) {
|
|
case ICMP6_PARAMPROB_HEADER:
|
|
type = ICMP_PARAMPROB;
|
|
code = ICMP_PARAMPROB_ERRATPTR;
|
|
ptr = ntohl(icmp6->icmp6_pptr);
|
|
|
|
if (ptr == PTR_IP6(ip6_vfc))
|
|
; /* preserve */
|
|
else if (ptr == PTR_IP6(ip6_vfc) + 1)
|
|
ptr = PTR_IP(ip_tos);
|
|
else if (ptr == PTR_IP6(ip6_plen) ||
|
|
ptr == PTR_IP6(ip6_plen) + 1)
|
|
ptr = PTR_IP(ip_len);
|
|
else if (ptr == PTR_IP6(ip6_nxt))
|
|
ptr = PTR_IP(ip_p);
|
|
else if (ptr == PTR_IP6(ip6_hlim))
|
|
ptr = PTR_IP(ip_ttl);
|
|
else if (ptr >= PTR_IP6(ip6_src) &&
|
|
ptr < PTR_IP6(ip6_dst))
|
|
ptr = PTR_IP(ip_src);
|
|
else if (ptr >= PTR_IP6(ip6_dst) &&
|
|
ptr < sizeof(struct ip6_hdr))
|
|
ptr = PTR_IP(ip_dst);
|
|
else {
|
|
return (-1);
|
|
}
|
|
break;
|
|
case ICMP6_PARAMPROB_NEXTHEADER:
|
|
type = ICMP_UNREACH;
|
|
code = ICMP_UNREACH_PROTOCOL;
|
|
break;
|
|
default:
|
|
return (-1);
|
|
}
|
|
break;
|
|
default:
|
|
return (-1);
|
|
}
|
|
|
|
pf_patch_8(pd, &icmp6->icmp6_type, type, PF_HI);
|
|
pf_patch_8(pd, &icmp6->icmp6_code, code, PF_LO);
|
|
|
|
/* aligns well with a icmpv4 nextmtu */
|
|
pf_patch_32(pd, &icmp6->icmp6_mtu, htonl(mtu));
|
|
|
|
/* icmpv4 pptr is a one most significant byte */
|
|
if (ptr >= 0)
|
|
pf_patch_32(pd, &icmp6->icmp6_pptr, htonl(ptr << 24));
|
|
break;
|
|
case AF_INET6:
|
|
icmp4 = arg;
|
|
type = icmp4->icmp_type;
|
|
code = icmp4->icmp_code;
|
|
mtu = ntohs(icmp4->icmp_nextmtu);
|
|
|
|
switch (type) {
|
|
case ICMP_ECHO:
|
|
type = ICMP6_ECHO_REQUEST;
|
|
break;
|
|
case ICMP_ECHOREPLY:
|
|
type = ICMP6_ECHO_REPLY;
|
|
break;
|
|
case ICMP_UNREACH:
|
|
type = ICMP6_DST_UNREACH;
|
|
switch (code) {
|
|
case ICMP_UNREACH_NET:
|
|
case ICMP_UNREACH_HOST:
|
|
case ICMP_UNREACH_NET_UNKNOWN:
|
|
case ICMP_UNREACH_HOST_UNKNOWN:
|
|
case ICMP_UNREACH_ISOLATED:
|
|
case ICMP_UNREACH_TOSNET:
|
|
case ICMP_UNREACH_TOSHOST:
|
|
code = ICMP6_DST_UNREACH_NOROUTE;
|
|
break;
|
|
case ICMP_UNREACH_PORT:
|
|
code = ICMP6_DST_UNREACH_NOPORT;
|
|
break;
|
|
case ICMP_UNREACH_NET_PROHIB:
|
|
case ICMP_UNREACH_HOST_PROHIB:
|
|
case ICMP_UNREACH_FILTER_PROHIB:
|
|
case ICMP_UNREACH_PRECEDENCE_CUTOFF:
|
|
code = ICMP6_DST_UNREACH_ADMIN;
|
|
break;
|
|
case ICMP_UNREACH_PROTOCOL:
|
|
type = ICMP6_PARAM_PROB;
|
|
code = ICMP6_PARAMPROB_NEXTHEADER;
|
|
ptr = offsetof(struct ip6_hdr, ip6_nxt);
|
|
break;
|
|
case ICMP_UNREACH_NEEDFRAG:
|
|
type = ICMP6_PACKET_TOO_BIG;
|
|
code = 0;
|
|
mtu += 20;
|
|
break;
|
|
default:
|
|
return (-1);
|
|
}
|
|
break;
|
|
case ICMP_TIMXCEED:
|
|
type = ICMP6_TIME_EXCEEDED;
|
|
break;
|
|
case ICMP_PARAMPROB:
|
|
type = ICMP6_PARAM_PROB;
|
|
switch (code) {
|
|
case ICMP_PARAMPROB_ERRATPTR:
|
|
code = ICMP6_PARAMPROB_HEADER;
|
|
break;
|
|
case ICMP_PARAMPROB_LENGTH:
|
|
code = ICMP6_PARAMPROB_HEADER;
|
|
break;
|
|
default:
|
|
return (-1);
|
|
}
|
|
|
|
ptr = icmp4->icmp_pptr;
|
|
if (ptr == 0 || ptr == PTR_IP(ip_tos))
|
|
; /* preserve */
|
|
else if (ptr == PTR_IP(ip_len) ||
|
|
ptr == PTR_IP(ip_len) + 1)
|
|
ptr = PTR_IP6(ip6_plen);
|
|
else if (ptr == PTR_IP(ip_ttl))
|
|
ptr = PTR_IP6(ip6_hlim);
|
|
else if (ptr == PTR_IP(ip_p))
|
|
ptr = PTR_IP6(ip6_nxt);
|
|
else if (ptr >= PTR_IP(ip_src) &&
|
|
ptr < PTR_IP(ip_dst))
|
|
ptr = PTR_IP6(ip6_src);
|
|
else if (ptr >= PTR_IP(ip_dst) &&
|
|
ptr < sizeof(struct ip))
|
|
ptr = PTR_IP6(ip6_dst);
|
|
else {
|
|
return (-1);
|
|
}
|
|
break;
|
|
default:
|
|
return (-1);
|
|
}
|
|
|
|
pf_patch_8(pd, &icmp4->icmp_type, type, PF_HI);
|
|
pf_patch_8(pd, &icmp4->icmp_code, code, PF_LO);
|
|
pf_patch_16(pd, &icmp4->icmp_nextmtu, htons(mtu));
|
|
if (ptr >= 0)
|
|
pf_patch_32(pd, &icmp4->icmp_void, htonl(ptr));
|
|
break;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
/*
|
|
* Need to modulate the sequence numbers in the TCP SACK option
|
|
* (credits to Krzysztof Pfaff for report and patch)
|
|
*/
|
|
int
|
|
pf_modulate_sack(struct pf_pdesc *pd, struct pf_state_peer *dst)
|
|
{
|
|
struct sackblk sack;
|
|
int copyback = 0, i;
|
|
int olen, optsoff;
|
|
u_int8_t opts[MAX_TCPOPTLEN], *opt, *eoh;
|
|
|
|
olen = (pd->hdr.tcp.th_off << 2) - sizeof(struct tcphdr);
|
|
optsoff = pd->off + sizeof(struct tcphdr);
|
|
#define TCPOLEN_MINSACK (TCPOLEN_SACK + 2)
|
|
if (olen < TCPOLEN_MINSACK ||
|
|
!pf_pull_hdr(pd->m, optsoff, opts, olen, NULL, pd->af))
|
|
return (0);
|
|
|
|
eoh = opts + olen;
|
|
opt = opts;
|
|
while ((opt = pf_find_tcpopt(opt, opts, olen,
|
|
TCPOPT_SACK, TCPOLEN_MINSACK)) != NULL)
|
|
{
|
|
size_t safelen = MIN(opt[1], (eoh - opt));
|
|
for (i = 2; i + TCPOLEN_SACK <= safelen; i += TCPOLEN_SACK) {
|
|
size_t startoff = (opt + i) - opts;
|
|
memcpy(&sack, &opt[i], sizeof(sack));
|
|
pf_patch_32_unaligned(pd, &sack.start,
|
|
htonl(ntohl(sack.start) - dst->seqdiff),
|
|
PF_ALGNMNT(startoff));
|
|
pf_patch_32_unaligned(pd, &sack.end,
|
|
htonl(ntohl(sack.end) - dst->seqdiff),
|
|
PF_ALGNMNT(startoff + sizeof(sack.start)));
|
|
memcpy(&opt[i], &sack, sizeof(sack));
|
|
}
|
|
copyback = 1;
|
|
opt += opt[1];
|
|
}
|
|
|
|
if (copyback)
|
|
m_copyback(pd->m, optsoff, olen, opts, M_NOWAIT);
|
|
return (copyback);
|
|
}
|
|
|
|
struct mbuf *
|
|
pf_build_tcp(const struct pf_rule *r, sa_family_t af,
|
|
const struct pf_addr *saddr, const struct pf_addr *daddr,
|
|
u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
|
|
u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
|
|
u_int16_t rtag, u_int sack, u_int rdom)
|
|
{
|
|
struct mbuf *m;
|
|
int len, tlen;
|
|
struct ip *h;
|
|
#ifdef INET6
|
|
struct ip6_hdr *h6;
|
|
#endif /* INET6 */
|
|
struct tcphdr *th;
|
|
char *opt;
|
|
|
|
/* maximum segment size tcp option */
|
|
tlen = sizeof(struct tcphdr);
|
|
if (mss)
|
|
tlen += 4;
|
|
if (sack)
|
|
tlen += 2;
|
|
|
|
switch (af) {
|
|
case AF_INET:
|
|
len = sizeof(struct ip) + tlen;
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
len = sizeof(struct ip6_hdr) + tlen;
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
unhandled_af(af);
|
|
}
|
|
|
|
/* create outgoing mbuf */
|
|
m = m_gethdr(M_DONTWAIT, MT_HEADER);
|
|
if (m == NULL)
|
|
return (NULL);
|
|
if (tag)
|
|
m->m_pkthdr.pf.flags |= PF_TAG_GENERATED;
|
|
m->m_pkthdr.pf.tag = rtag;
|
|
m->m_pkthdr.ph_rtableid = rdom;
|
|
if (r && (r->scrub_flags & PFSTATE_SETPRIO))
|
|
m->m_pkthdr.pf.prio = r->set_prio[0];
|
|
if (r && r->qid)
|
|
m->m_pkthdr.pf.qid = r->qid;
|
|
m->m_data += max_linkhdr;
|
|
m->m_pkthdr.len = m->m_len = len;
|
|
m->m_pkthdr.ph_ifidx = 0;
|
|
m->m_pkthdr.csum_flags |= M_TCP_CSUM_OUT;
|
|
memset(m->m_data, 0, len);
|
|
switch (af) {
|
|
case AF_INET:
|
|
h = mtod(m, struct ip *);
|
|
h->ip_p = IPPROTO_TCP;
|
|
h->ip_len = htons(tlen);
|
|
h->ip_v = 4;
|
|
h->ip_hl = sizeof(*h) >> 2;
|
|
h->ip_tos = IPTOS_LOWDELAY;
|
|
h->ip_len = htons(len);
|
|
h->ip_off = htons(ip_mtudisc ? IP_DF : 0);
|
|
h->ip_ttl = ttl ? ttl : ip_defttl;
|
|
h->ip_sum = 0;
|
|
h->ip_src.s_addr = saddr->v4.s_addr;
|
|
h->ip_dst.s_addr = daddr->v4.s_addr;
|
|
|
|
th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
h6 = mtod(m, struct ip6_hdr *);
|
|
h6->ip6_nxt = IPPROTO_TCP;
|
|
h6->ip6_plen = htons(tlen);
|
|
h6->ip6_vfc |= IPV6_VERSION;
|
|
h6->ip6_hlim = IPV6_DEFHLIM;
|
|
memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
|
|
memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
|
|
|
|
th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
unhandled_af(af);
|
|
}
|
|
|
|
/* TCP header */
|
|
th->th_sport = sport;
|
|
th->th_dport = dport;
|
|
th->th_seq = htonl(seq);
|
|
th->th_ack = htonl(ack);
|
|
th->th_off = tlen >> 2;
|
|
th->th_flags = flags;
|
|
th->th_win = htons(win);
|
|
|
|
opt = (char *)(th + 1);
|
|
if (mss) {
|
|
opt[0] = TCPOPT_MAXSEG;
|
|
opt[1] = 4;
|
|
mss = htons(mss);
|
|
memcpy((opt + 2), &mss, 2);
|
|
opt += 4;
|
|
}
|
|
if (sack) {
|
|
opt[0] = TCPOPT_SACK_PERMITTED;
|
|
opt[1] = 2;
|
|
opt += 2;
|
|
}
|
|
|
|
return (m);
|
|
}
|
|
|
|
void
|
|
pf_send_tcp(const struct pf_rule *r, sa_family_t af,
|
|
const struct pf_addr *saddr, const struct pf_addr *daddr,
|
|
u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
|
|
u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
|
|
u_int16_t rtag, u_int rdom)
|
|
{
|
|
struct mbuf *m;
|
|
|
|
if ((m = pf_build_tcp(r, af, saddr, daddr, sport, dport, seq, ack,
|
|
flags, win, mss, ttl, tag, rtag, 0, rdom)) == NULL)
|
|
return;
|
|
|
|
switch (af) {
|
|
case AF_INET:
|
|
ip_send(m);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
ip6_send(m);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
}
|
|
|
|
static void
|
|
pf_send_challenge_ack(struct pf_pdesc *pd, struct pf_state *st,
|
|
struct pf_state_peer *src, struct pf_state_peer *dst)
|
|
{
|
|
/*
|
|
* We are sending challenge ACK as a response to SYN packet, which
|
|
* matches existing state (modulo TCP window check). Therefore packet
|
|
* must be sent on behalf of destination.
|
|
*
|
|
* We expect sender to remain either silent, or send RST packet
|
|
* so both, firewall and remote peer, can purge dead state from
|
|
* memory.
|
|
*/
|
|
pf_send_tcp(st->rule.ptr, pd->af, pd->dst, pd->src,
|
|
pd->hdr.tcp.th_dport, pd->hdr.tcp.th_sport, dst->seqlo,
|
|
src->seqlo, TH_ACK, 0, 0, st->rule.ptr->return_ttl, 1, 0,
|
|
pd->rdomain);
|
|
}
|
|
|
|
void
|
|
pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, int param,
|
|
sa_family_t af, struct pf_rule *r, u_int rdomain)
|
|
{
|
|
struct mbuf *m0;
|
|
|
|
if ((m0 = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL)
|
|
return;
|
|
|
|
m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED;
|
|
m0->m_pkthdr.ph_rtableid = rdomain;
|
|
if (r && (r->scrub_flags & PFSTATE_SETPRIO))
|
|
m0->m_pkthdr.pf.prio = r->set_prio[0];
|
|
if (r && r->qid)
|
|
m0->m_pkthdr.pf.qid = r->qid;
|
|
|
|
switch (af) {
|
|
case AF_INET:
|
|
icmp_error(m0, type, code, 0, param);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
icmp6_error(m0, type, code, param);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return ((n = 0) == (a = b [with mask m]))
|
|
* Note: n != 0 => returns (a != b [with mask m])
|
|
*/
|
|
int
|
|
pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
|
|
struct pf_addr *b, sa_family_t af)
|
|
{
|
|
switch (af) {
|
|
case AF_INET:
|
|
if ((a->addr32[0] & m->addr32[0]) ==
|
|
(b->addr32[0] & m->addr32[0]))
|
|
return (n == 0);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (((a->addr32[0] & m->addr32[0]) ==
|
|
(b->addr32[0] & m->addr32[0])) &&
|
|
((a->addr32[1] & m->addr32[1]) ==
|
|
(b->addr32[1] & m->addr32[1])) &&
|
|
((a->addr32[2] & m->addr32[2]) ==
|
|
(b->addr32[2] & m->addr32[2])) &&
|
|
((a->addr32[3] & m->addr32[3]) ==
|
|
(b->addr32[3] & m->addr32[3])))
|
|
return (n == 0);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
|
|
return (n != 0);
|
|
}
|
|
|
|
/*
|
|
* Return 1 if b <= a <= e, otherwise return 0.
|
|
*/
|
|
int
|
|
pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
|
|
struct pf_addr *a, sa_family_t af)
|
|
{
|
|
switch (af) {
|
|
case AF_INET:
|
|
if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) ||
|
|
(ntohl(a->addr32[0]) > ntohl(e->addr32[0])))
|
|
return (0);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6: {
|
|
int i;
|
|
|
|
/* check a >= b */
|
|
for (i = 0; i < 4; ++i)
|
|
if (ntohl(a->addr32[i]) > ntohl(b->addr32[i]))
|
|
break;
|
|
else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i]))
|
|
return (0);
|
|
/* check a <= e */
|
|
for (i = 0; i < 4; ++i)
|
|
if (ntohl(a->addr32[i]) < ntohl(e->addr32[i]))
|
|
break;
|
|
else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i]))
|
|
return (0);
|
|
break;
|
|
}
|
|
#endif /* INET6 */
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
|
|
{
|
|
switch (op) {
|
|
case PF_OP_IRG:
|
|
return ((p > a1) && (p < a2));
|
|
case PF_OP_XRG:
|
|
return ((p < a1) || (p > a2));
|
|
case PF_OP_RRG:
|
|
return ((p >= a1) && (p <= a2));
|
|
case PF_OP_EQ:
|
|
return (p == a1);
|
|
case PF_OP_NE:
|
|
return (p != a1);
|
|
case PF_OP_LT:
|
|
return (p < a1);
|
|
case PF_OP_LE:
|
|
return (p <= a1);
|
|
case PF_OP_GT:
|
|
return (p > a1);
|
|
case PF_OP_GE:
|
|
return (p >= a1);
|
|
}
|
|
return (0); /* never reached */
|
|
}
|
|
|
|
int
|
|
pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
|
|
{
|
|
return (pf_match(op, ntohs(a1), ntohs(a2), ntohs(p)));
|
|
}
|
|
|
|
int
|
|
pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
|
|
{
|
|
if (u == -1 && op != PF_OP_EQ && op != PF_OP_NE)
|
|
return (0);
|
|
return (pf_match(op, a1, a2, u));
|
|
}
|
|
|
|
int
|
|
pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
|
|
{
|
|
if (g == -1 && op != PF_OP_EQ && op != PF_OP_NE)
|
|
return (0);
|
|
return (pf_match(op, a1, a2, g));
|
|
}
|
|
|
|
int
|
|
pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag)
|
|
{
|
|
if (*tag == -1)
|
|
*tag = m->m_pkthdr.pf.tag;
|
|
|
|
return ((!r->match_tag_not && r->match_tag == *tag) ||
|
|
(r->match_tag_not && r->match_tag != *tag));
|
|
}
|
|
|
|
int
|
|
pf_match_rcvif(struct mbuf *m, struct pf_rule *r)
|
|
{
|
|
struct ifnet *ifp;
|
|
#if NCARP > 0
|
|
struct ifnet *ifp0;
|
|
#endif
|
|
struct pfi_kif *kif;
|
|
|
|
ifp = if_get(m->m_pkthdr.ph_ifidx);
|
|
if (ifp == NULL)
|
|
return (0);
|
|
|
|
#if NCARP > 0
|
|
if (ifp->if_type == IFT_CARP &&
|
|
(ifp0 = if_get(ifp->if_carpdevidx)) != NULL) {
|
|
kif = (struct pfi_kif *)ifp0->if_pf_kif;
|
|
if_put(ifp0);
|
|
} else
|
|
#endif /* NCARP */
|
|
kif = (struct pfi_kif *)ifp->if_pf_kif;
|
|
|
|
if_put(ifp);
|
|
|
|
if (kif == NULL) {
|
|
DPFPRINTF(LOG_ERR,
|
|
"%s: kif == NULL, @%d via %s", __func__,
|
|
r->nr, r->rcv_ifname);
|
|
return (0);
|
|
}
|
|
|
|
return (pfi_kif_match(r->rcv_kif, kif));
|
|
}
|
|
|
|
void
|
|
pf_tag_packet(struct mbuf *m, int tag, int rtableid)
|
|
{
|
|
if (tag > 0)
|
|
m->m_pkthdr.pf.tag = tag;
|
|
if (rtableid >= 0)
|
|
m->m_pkthdr.ph_rtableid = (u_int)rtableid;
|
|
}
|
|
|
|
void
|
|
pf_anchor_stack_init(void)
|
|
{
|
|
struct pf_anchor_stackframe *stack;
|
|
|
|
stack = (struct pf_anchor_stackframe *)cpumem_enter(pf_anchor_stack);
|
|
stack[PF_ANCHOR_STACK_MAX].sf_stack_top = &stack[0];
|
|
cpumem_leave(pf_anchor_stack, stack);
|
|
}
|
|
|
|
int
|
|
pf_anchor_stack_is_full(struct pf_anchor_stackframe *sf)
|
|
{
|
|
struct pf_anchor_stackframe *stack;
|
|
int rv;
|
|
|
|
stack = (struct pf_anchor_stackframe *)cpumem_enter(pf_anchor_stack);
|
|
rv = (sf == &stack[PF_ANCHOR_STACK_MAX]);
|
|
cpumem_leave(pf_anchor_stack, stack);
|
|
|
|
return (rv);
|
|
}
|
|
|
|
int
|
|
pf_anchor_stack_is_empty(struct pf_anchor_stackframe *sf)
|
|
{
|
|
struct pf_anchor_stackframe *stack;
|
|
int rv;
|
|
|
|
stack = (struct pf_anchor_stackframe *)cpumem_enter(pf_anchor_stack);
|
|
rv = (sf == &stack[0]);
|
|
cpumem_leave(pf_anchor_stack, stack);
|
|
|
|
return (rv);
|
|
}
|
|
|
|
struct pf_anchor_stackframe *
|
|
pf_anchor_stack_top(void)
|
|
{
|
|
struct pf_anchor_stackframe *stack;
|
|
struct pf_anchor_stackframe *top_sf;
|
|
|
|
stack = (struct pf_anchor_stackframe *)cpumem_enter(pf_anchor_stack);
|
|
top_sf = stack[PF_ANCHOR_STACK_MAX].sf_stack_top;
|
|
cpumem_leave(pf_anchor_stack, stack);
|
|
|
|
return (top_sf);
|
|
}
|
|
|
|
int
|
|
pf_anchor_stack_push(struct pf_ruleset *rs, struct pf_rule *r,
|
|
struct pf_anchor *child, int jump_target)
|
|
{
|
|
struct pf_anchor_stackframe *stack;
|
|
struct pf_anchor_stackframe *top_sf = pf_anchor_stack_top();
|
|
|
|
top_sf++;
|
|
if (pf_anchor_stack_is_full(top_sf))
|
|
return (-1);
|
|
|
|
top_sf->sf_rs = rs;
|
|
top_sf->sf_r = r;
|
|
top_sf->sf_child = child;
|
|
top_sf->sf_jump_target = jump_target;
|
|
|
|
stack = (struct pf_anchor_stackframe *)cpumem_enter(pf_anchor_stack);
|
|
|
|
if ((top_sf <= &stack[0]) || (top_sf >= &stack[PF_ANCHOR_STACK_MAX]))
|
|
panic("%s: top frame outside of anchor stack range", __func__);
|
|
|
|
stack[PF_ANCHOR_STACK_MAX].sf_stack_top = top_sf;
|
|
cpumem_leave(pf_anchor_stack, stack);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
pf_anchor_stack_pop(struct pf_ruleset **rs, struct pf_rule **r,
|
|
struct pf_anchor **child, int *jump_target)
|
|
{
|
|
struct pf_anchor_stackframe *top_sf = pf_anchor_stack_top();
|
|
struct pf_anchor_stackframe *stack;
|
|
int on_top;
|
|
|
|
stack = (struct pf_anchor_stackframe *)cpumem_enter(pf_anchor_stack);
|
|
if (pf_anchor_stack_is_empty(top_sf)) {
|
|
on_top = -1;
|
|
} else {
|
|
if ((top_sf <= &stack[0]) ||
|
|
(top_sf >= &stack[PF_ANCHOR_STACK_MAX]))
|
|
panic("%s: top frame outside of anchor stack range",
|
|
__func__);
|
|
|
|
*rs = top_sf->sf_rs;
|
|
*r = top_sf->sf_r;
|
|
*child = top_sf->sf_child;
|
|
*jump_target = top_sf->sf_jump_target;
|
|
top_sf--;
|
|
stack[PF_ANCHOR_STACK_MAX].sf_stack_top = top_sf;
|
|
on_top = 0;
|
|
}
|
|
cpumem_leave(pf_anchor_stack, stack);
|
|
|
|
return (on_top);
|
|
}
|
|
|
|
void
|
|
pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
|
|
struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
|
|
{
|
|
switch (af) {
|
|
case AF_INET:
|
|
naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
|
|
((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
|
|
((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
|
|
naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
|
|
((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
|
|
naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
|
|
((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
|
|
naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
|
|
((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
unhandled_af(af);
|
|
}
|
|
}
|
|
|
|
void
|
|
pf_addr_inc(struct pf_addr *addr, sa_family_t af)
|
|
{
|
|
switch (af) {
|
|
case AF_INET:
|
|
addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (addr->addr32[3] == 0xffffffff) {
|
|
addr->addr32[3] = 0;
|
|
if (addr->addr32[2] == 0xffffffff) {
|
|
addr->addr32[2] = 0;
|
|
if (addr->addr32[1] == 0xffffffff) {
|
|
addr->addr32[1] = 0;
|
|
addr->addr32[0] =
|
|
htonl(ntohl(addr->addr32[0]) + 1);
|
|
} else
|
|
addr->addr32[1] =
|
|
htonl(ntohl(addr->addr32[1]) + 1);
|
|
} else
|
|
addr->addr32[2] =
|
|
htonl(ntohl(addr->addr32[2]) + 1);
|
|
} else
|
|
addr->addr32[3] =
|
|
htonl(ntohl(addr->addr32[3]) + 1);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
unhandled_af(af);
|
|
}
|
|
}
|
|
|
|
int
|
|
pf_socket_lookup(struct pf_pdesc *pd)
|
|
{
|
|
struct pf_addr *saddr, *daddr;
|
|
u_int16_t sport, dport;
|
|
struct inpcbtable *table;
|
|
struct inpcb *inp;
|
|
|
|
pd->lookup.uid = -1;
|
|
pd->lookup.gid = -1;
|
|
pd->lookup.pid = NO_PID;
|
|
switch (pd->virtual_proto) {
|
|
case IPPROTO_TCP:
|
|
sport = pd->hdr.tcp.th_sport;
|
|
dport = pd->hdr.tcp.th_dport;
|
|
PF_ASSERT_LOCKED();
|
|
NET_ASSERT_LOCKED();
|
|
table = &tcbtable;
|
|
break;
|
|
case IPPROTO_UDP:
|
|
sport = pd->hdr.udp.uh_sport;
|
|
dport = pd->hdr.udp.uh_dport;
|
|
PF_ASSERT_LOCKED();
|
|
NET_ASSERT_LOCKED();
|
|
table = &udbtable;
|
|
break;
|
|
default:
|
|
return (-1);
|
|
}
|
|
if (pd->dir == PF_IN) {
|
|
saddr = pd->src;
|
|
daddr = pd->dst;
|
|
} else {
|
|
u_int16_t p;
|
|
|
|
p = sport;
|
|
sport = dport;
|
|
dport = p;
|
|
saddr = pd->dst;
|
|
daddr = pd->src;
|
|
}
|
|
switch (pd->af) {
|
|
case AF_INET:
|
|
/*
|
|
* Fails when rtable is changed while evaluating the ruleset
|
|
* The socket looked up will not match the one hit in the end.
|
|
*/
|
|
inp = in_pcblookup(table, saddr->v4, sport, daddr->v4, dport,
|
|
pd->rdomain);
|
|
if (inp == NULL) {
|
|
inp = in_pcblookup_listen(table, daddr->v4, dport,
|
|
NULL, pd->rdomain);
|
|
if (inp == NULL)
|
|
return (-1);
|
|
}
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (pd->virtual_proto == IPPROTO_UDP)
|
|
table = &udb6table;
|
|
if (pd->virtual_proto == IPPROTO_TCP)
|
|
table = &tcb6table;
|
|
inp = in6_pcblookup(table, &saddr->v6, sport, &daddr->v6,
|
|
dport, pd->rdomain);
|
|
if (inp == NULL) {
|
|
inp = in6_pcblookup_listen(table, &daddr->v6, dport,
|
|
NULL, pd->rdomain);
|
|
if (inp == NULL)
|
|
return (-1);
|
|
}
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
unhandled_af(pd->af);
|
|
}
|
|
pd->lookup.uid = inp->inp_socket->so_euid;
|
|
pd->lookup.gid = inp->inp_socket->so_egid;
|
|
pd->lookup.pid = inp->inp_socket->so_cpid;
|
|
in_pcbunref(inp);
|
|
return (1);
|
|
}
|
|
|
|
/* post: r => (r[0] == type /\ r[1] >= min_typelen >= 2 "validity"
|
|
* /\ (eoh - r) >= min_typelen >= 2 "safety" )
|
|
*
|
|
* warning: r + r[1] may exceed opts bounds for r[1] > min_typelen
|
|
*/
|
|
u_int8_t*
|
|
pf_find_tcpopt(u_int8_t *opt, u_int8_t *opts, size_t hlen, u_int8_t type,
|
|
u_int8_t min_typelen)
|
|
{
|
|
u_int8_t *eoh = opts + hlen;
|
|
|
|
if (min_typelen < 2)
|
|
return (NULL);
|
|
|
|
while ((eoh - opt) >= min_typelen) {
|
|
switch (*opt) {
|
|
case TCPOPT_EOL:
|
|
/* FALLTHROUGH - Workaround the failure of some
|
|
systems to NOP-pad their bzero'd option buffers,
|
|
producing spurious EOLs */
|
|
case TCPOPT_NOP:
|
|
opt++;
|
|
continue;
|
|
default:
|
|
if (opt[0] == type &&
|
|
opt[1] >= min_typelen)
|
|
return (opt);
|
|
}
|
|
|
|
opt += MAX(opt[1], 2); /* evade infinite loops */
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
u_int8_t
|
|
pf_get_wscale(struct pf_pdesc *pd)
|
|
{
|
|
int olen;
|
|
u_int8_t opts[MAX_TCPOPTLEN], *opt;
|
|
u_int8_t wscale = 0;
|
|
|
|
olen = (pd->hdr.tcp.th_off << 2) - sizeof(struct tcphdr);
|
|
if (olen < TCPOLEN_WINDOW || !pf_pull_hdr(pd->m,
|
|
pd->off + sizeof(struct tcphdr), opts, olen, NULL, pd->af))
|
|
return (0);
|
|
|
|
opt = opts;
|
|
while ((opt = pf_find_tcpopt(opt, opts, olen,
|
|
TCPOPT_WINDOW, TCPOLEN_WINDOW)) != NULL) {
|
|
wscale = opt[2];
|
|
wscale = MIN(wscale, TCP_MAX_WINSHIFT);
|
|
wscale |= PF_WSCALE_FLAG;
|
|
|
|
opt += opt[1];
|
|
}
|
|
|
|
return (wscale);
|
|
}
|
|
|
|
u_int16_t
|
|
pf_get_mss(struct pf_pdesc *pd)
|
|
{
|
|
int olen;
|
|
u_int8_t opts[MAX_TCPOPTLEN], *opt;
|
|
u_int16_t mss = tcp_mssdflt;
|
|
|
|
olen = (pd->hdr.tcp.th_off << 2) - sizeof(struct tcphdr);
|
|
if (olen < TCPOLEN_MAXSEG || !pf_pull_hdr(pd->m,
|
|
pd->off + sizeof(struct tcphdr), opts, olen, NULL, pd->af))
|
|
return (0);
|
|
|
|
opt = opts;
|
|
while ((opt = pf_find_tcpopt(opt, opts, olen,
|
|
TCPOPT_MAXSEG, TCPOLEN_MAXSEG)) != NULL) {
|
|
memcpy(&mss, (opt + 2), 2);
|
|
mss = ntohs(mss);
|
|
|
|
opt += opt[1];
|
|
}
|
|
return (mss);
|
|
}
|
|
|
|
u_int16_t
|
|
pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer)
|
|
{
|
|
struct ifnet *ifp;
|
|
struct sockaddr_in *dst;
|
|
#ifdef INET6
|
|
struct sockaddr_in6 *dst6;
|
|
#endif /* INET6 */
|
|
struct rtentry *rt = NULL;
|
|
struct sockaddr_storage ss;
|
|
int hlen;
|
|
u_int16_t mss = tcp_mssdflt;
|
|
|
|
memset(&ss, 0, sizeof(ss));
|
|
|
|
switch (af) {
|
|
case AF_INET:
|
|
hlen = sizeof(struct ip);
|
|
dst = (struct sockaddr_in *)&ss;
|
|
dst->sin_family = AF_INET;
|
|
dst->sin_len = sizeof(*dst);
|
|
dst->sin_addr = addr->v4;
|
|
rt = rtalloc(sintosa(dst), 0, rtableid);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
hlen = sizeof(struct ip6_hdr);
|
|
dst6 = (struct sockaddr_in6 *)&ss;
|
|
dst6->sin6_family = AF_INET6;
|
|
dst6->sin6_len = sizeof(*dst6);
|
|
dst6->sin6_addr = addr->v6;
|
|
rt = rtalloc(sin6tosa(dst6), 0, rtableid);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
|
|
if (rt != NULL && (ifp = if_get(rt->rt_ifidx)) != NULL) {
|
|
mss = ifp->if_mtu - hlen - sizeof(struct tcphdr);
|
|
mss = max(tcp_mssdflt, mss);
|
|
if_put(ifp);
|
|
}
|
|
rtfree(rt);
|
|
mss = min(mss, offer);
|
|
mss = max(mss, 64); /* sanity - at least max opt space */
|
|
return (mss);
|
|
}
|
|
|
|
static __inline int
|
|
pf_set_rt_ifp(struct pf_state *st, struct pf_addr *saddr, sa_family_t af,
|
|
struct pf_src_node **sns)
|
|
{
|
|
struct pf_rule *r = st->rule.ptr;
|
|
int rv;
|
|
|
|
if (!r->rt)
|
|
return (0);
|
|
|
|
rv = pf_map_addr(af, r, saddr, &st->rt_addr, NULL, sns,
|
|
&r->route, PF_SN_ROUTE);
|
|
if (rv == 0)
|
|
st->rt = r->rt;
|
|
|
|
return (rv);
|
|
}
|
|
|
|
u_int32_t
|
|
pf_tcp_iss(struct pf_pdesc *pd)
|
|
{
|
|
SHA2_CTX ctx;
|
|
union {
|
|
uint8_t bytes[SHA512_DIGEST_LENGTH];
|
|
uint32_t words[1];
|
|
} digest;
|
|
|
|
if (pf_tcp_secret_init == 0) {
|
|
arc4random_buf(pf_tcp_secret, sizeof(pf_tcp_secret));
|
|
SHA512Init(&pf_tcp_secret_ctx);
|
|
SHA512Update(&pf_tcp_secret_ctx, pf_tcp_secret,
|
|
sizeof(pf_tcp_secret));
|
|
pf_tcp_secret_init = 1;
|
|
}
|
|
ctx = pf_tcp_secret_ctx;
|
|
|
|
SHA512Update(&ctx, &pd->rdomain, sizeof(pd->rdomain));
|
|
SHA512Update(&ctx, &pd->hdr.tcp.th_sport, sizeof(u_short));
|
|
SHA512Update(&ctx, &pd->hdr.tcp.th_dport, sizeof(u_short));
|
|
switch (pd->af) {
|
|
case AF_INET:
|
|
SHA512Update(&ctx, &pd->src->v4, sizeof(struct in_addr));
|
|
SHA512Update(&ctx, &pd->dst->v4, sizeof(struct in_addr));
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
SHA512Update(&ctx, &pd->src->v6, sizeof(struct in6_addr));
|
|
SHA512Update(&ctx, &pd->dst->v6, sizeof(struct in6_addr));
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
SHA512Final(digest.bytes, &ctx);
|
|
pf_tcp_iss_off += 4096;
|
|
return (digest.words[0] + READ_ONCE(tcp_iss) + pf_tcp_iss_off);
|
|
}
|
|
|
|
void
|
|
pf_rule_to_actions(struct pf_rule *r, struct pf_rule_actions *a)
|
|
{
|
|
if (r->qid)
|
|
a->qid = r->qid;
|
|
if (r->pqid)
|
|
a->pqid = r->pqid;
|
|
if (r->rtableid >= 0)
|
|
a->rtableid = r->rtableid;
|
|
#if NPFLOG > 0
|
|
a->log |= r->log;
|
|
#endif /* NPFLOG > 0 */
|
|
if (r->scrub_flags & PFSTATE_SETTOS)
|
|
a->set_tos = r->set_tos;
|
|
if (r->min_ttl)
|
|
a->min_ttl = r->min_ttl;
|
|
if (r->max_mss)
|
|
a->max_mss = r->max_mss;
|
|
a->flags |= (r->scrub_flags & (PFSTATE_NODF|PFSTATE_RANDOMID|
|
|
PFSTATE_SETTOS|PFSTATE_SCRUB_TCP|PFSTATE_SETPRIO));
|
|
if (r->scrub_flags & PFSTATE_SETPRIO) {
|
|
a->set_prio[0] = r->set_prio[0];
|
|
a->set_prio[1] = r->set_prio[1];
|
|
}
|
|
if (r->rule_flag & PFRULE_SETDELAY)
|
|
a->delay = r->delay;
|
|
}
|
|
|
|
#define PF_TEST_ATTRIB(t, a) \
|
|
if (t) { \
|
|
r = a; \
|
|
continue; \
|
|
} else do { \
|
|
} while (0)
|
|
|
|
enum pf_test_status
|
|
pf_match_rule(struct pf_test_ctx *ctx, struct pf_ruleset *ruleset)
|
|
{
|
|
struct pf_rule *r;
|
|
struct pf_anchor *child = NULL;
|
|
int target;
|
|
|
|
pf_anchor_stack_init();
|
|
enter_ruleset:
|
|
r = TAILQ_FIRST(ruleset->rules.active.ptr);
|
|
while (r != NULL) {
|
|
PF_TEST_ATTRIB(r->rule_flag & PFRULE_EXPIRED,
|
|
TAILQ_NEXT(r, entries));
|
|
r->evaluations++;
|
|
PF_TEST_ATTRIB(
|
|
(pfi_kif_match(r->kif, ctx->pd->kif) == r->ifnot),
|
|
r->skip[PF_SKIP_IFP].ptr);
|
|
PF_TEST_ATTRIB((r->direction && r->direction != ctx->pd->dir),
|
|
r->skip[PF_SKIP_DIR].ptr);
|
|
PF_TEST_ATTRIB((r->onrdomain >= 0 &&
|
|
(r->onrdomain == ctx->pd->rdomain) == r->ifnot),
|
|
r->skip[PF_SKIP_RDOM].ptr);
|
|
PF_TEST_ATTRIB((r->af && r->af != ctx->pd->af),
|
|
r->skip[PF_SKIP_AF].ptr);
|
|
PF_TEST_ATTRIB((r->proto && r->proto != ctx->pd->proto),
|
|
r->skip[PF_SKIP_PROTO].ptr);
|
|
PF_TEST_ATTRIB((PF_MISMATCHAW(&r->src.addr, &ctx->pd->nsaddr,
|
|
ctx->pd->naf, r->src.neg, ctx->pd->kif,
|
|
ctx->act.rtableid)),
|
|
r->skip[PF_SKIP_SRC_ADDR].ptr);
|
|
PF_TEST_ATTRIB((PF_MISMATCHAW(&r->dst.addr, &ctx->pd->ndaddr,
|
|
ctx->pd->af, r->dst.neg, NULL, ctx->act.rtableid)),
|
|
r->skip[PF_SKIP_DST_ADDR].ptr);
|
|
|
|
switch (ctx->pd->virtual_proto) {
|
|
case PF_VPROTO_FRAGMENT:
|
|
/* tcp/udp only. port_op always 0 in other cases */
|
|
PF_TEST_ATTRIB((r->src.port_op || r->dst.port_op),
|
|
TAILQ_NEXT(r, entries));
|
|
PF_TEST_ATTRIB((ctx->pd->proto == IPPROTO_TCP &&
|
|
r->flagset),
|
|
TAILQ_NEXT(r, entries));
|
|
/* icmp only. type/code always 0 in other cases */
|
|
PF_TEST_ATTRIB((r->type || r->code),
|
|
TAILQ_NEXT(r, entries));
|
|
/* tcp/udp only. {uid|gid}.op always 0 in other cases */
|
|
PF_TEST_ATTRIB((r->gid.op || r->uid.op),
|
|
TAILQ_NEXT(r, entries));
|
|
break;
|
|
|
|
case IPPROTO_TCP:
|
|
PF_TEST_ATTRIB(((r->flagset & ctx->th->th_flags) !=
|
|
r->flags),
|
|
TAILQ_NEXT(r, entries));
|
|
PF_TEST_ATTRIB((r->os_fingerprint != PF_OSFP_ANY &&
|
|
!pf_osfp_match(pf_osfp_fingerprint(ctx->pd),
|
|
r->os_fingerprint)),
|
|
TAILQ_NEXT(r, entries));
|
|
/* FALLTHROUGH */
|
|
|
|
case IPPROTO_UDP:
|
|
/* tcp/udp only. port_op always 0 in other cases */
|
|
PF_TEST_ATTRIB((r->src.port_op &&
|
|
!pf_match_port(r->src.port_op, r->src.port[0],
|
|
r->src.port[1], ctx->pd->nsport)),
|
|
r->skip[PF_SKIP_SRC_PORT].ptr);
|
|
PF_TEST_ATTRIB((r->dst.port_op &&
|
|
!pf_match_port(r->dst.port_op, r->dst.port[0],
|
|
r->dst.port[1], ctx->pd->ndport)),
|
|
r->skip[PF_SKIP_DST_PORT].ptr);
|
|
/* tcp/udp only. uid.op always 0 in other cases */
|
|
PF_TEST_ATTRIB((r->uid.op && (ctx->pd->lookup.done ||
|
|
(ctx->pd->lookup.done =
|
|
pf_socket_lookup(ctx->pd), 1)) &&
|
|
!pf_match_uid(r->uid.op, r->uid.uid[0],
|
|
r->uid.uid[1], ctx->pd->lookup.uid)),
|
|
TAILQ_NEXT(r, entries));
|
|
/* tcp/udp only. gid.op always 0 in other cases */
|
|
PF_TEST_ATTRIB((r->gid.op && (ctx->pd->lookup.done ||
|
|
(ctx->pd->lookup.done =
|
|
pf_socket_lookup(ctx->pd), 1)) &&
|
|
!pf_match_gid(r->gid.op, r->gid.gid[0],
|
|
r->gid.gid[1], ctx->pd->lookup.gid)),
|
|
TAILQ_NEXT(r, entries));
|
|
break;
|
|
|
|
case IPPROTO_ICMP:
|
|
/* icmp only. type always 0 in other cases */
|
|
PF_TEST_ATTRIB((r->type &&
|
|
r->type != ctx->icmptype + 1),
|
|
TAILQ_NEXT(r, entries));
|
|
/* icmp only. type always 0 in other cases */
|
|
PF_TEST_ATTRIB((r->code &&
|
|
r->code != ctx->icmpcode + 1),
|
|
TAILQ_NEXT(r, entries));
|
|
/* icmp only. don't create states on replies */
|
|
PF_TEST_ATTRIB((r->keep_state && !ctx->state_icmp &&
|
|
(r->rule_flag & PFRULE_STATESLOPPY) == 0 &&
|
|
ctx->icmp_dir != PF_IN),
|
|
TAILQ_NEXT(r, entries));
|
|
break;
|
|
|
|
case IPPROTO_ICMPV6:
|
|
/* icmp only. type always 0 in other cases */
|
|
PF_TEST_ATTRIB((r->type &&
|
|
r->type != ctx->icmptype + 1),
|
|
TAILQ_NEXT(r, entries));
|
|
/* icmp only. type always 0 in other cases */
|
|
PF_TEST_ATTRIB((r->code &&
|
|
r->code != ctx->icmpcode + 1),
|
|
TAILQ_NEXT(r, entries));
|
|
/* icmp only. don't create states on replies */
|
|
PF_TEST_ATTRIB((r->keep_state && !ctx->state_icmp &&
|
|
(r->rule_flag & PFRULE_STATESLOPPY) == 0 &&
|
|
ctx->icmp_dir != PF_IN &&
|
|
ctx->icmptype != ND_NEIGHBOR_ADVERT),
|
|
TAILQ_NEXT(r, entries));
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
PF_TEST_ATTRIB((r->rule_flag & PFRULE_FRAGMENT &&
|
|
ctx->pd->virtual_proto != PF_VPROTO_FRAGMENT),
|
|
TAILQ_NEXT(r, entries));
|
|
PF_TEST_ATTRIB((r->tos && !(r->tos == ctx->pd->tos)),
|
|
TAILQ_NEXT(r, entries));
|
|
PF_TEST_ATTRIB((r->prob &&
|
|
r->prob <= arc4random_uniform(UINT_MAX - 1) + 1),
|
|
TAILQ_NEXT(r, entries));
|
|
PF_TEST_ATTRIB((r->match_tag &&
|
|
!pf_match_tag(ctx->pd->m, r, &ctx->tag)),
|
|
TAILQ_NEXT(r, entries));
|
|
PF_TEST_ATTRIB((r->rcv_kif && pf_match_rcvif(ctx->pd->m, r) ==
|
|
r->rcvifnot),
|
|
TAILQ_NEXT(r, entries));
|
|
PF_TEST_ATTRIB((r->prio &&
|
|
(r->prio == PF_PRIO_ZERO ? 0 : r->prio) !=
|
|
ctx->pd->m->m_pkthdr.pf.prio),
|
|
TAILQ_NEXT(r, entries));
|
|
|
|
/* must be last! */
|
|
if (r->pktrate.limit) {
|
|
pf_add_threshold(&r->pktrate);
|
|
PF_TEST_ATTRIB((pf_check_threshold(&r->pktrate)),
|
|
TAILQ_NEXT(r, entries));
|
|
}
|
|
|
|
/* FALLTHROUGH */
|
|
if (r->tag)
|
|
ctx->tag = r->tag;
|
|
if (r->anchor == NULL) {
|
|
|
|
if (r->rule_flag & PFRULE_ONCE) {
|
|
u_int32_t rule_flag;
|
|
|
|
rule_flag = r->rule_flag;
|
|
if (((rule_flag & PFRULE_EXPIRED) == 0) &&
|
|
atomic_cas_uint(&r->rule_flag, rule_flag,
|
|
rule_flag | PFRULE_EXPIRED) == rule_flag) {
|
|
r->exptime = gettime();
|
|
} else {
|
|
r = TAILQ_NEXT(r, entries);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (r->action == PF_MATCH) {
|
|
if ((ctx->ri = pool_get(&pf_rule_item_pl,
|
|
PR_NOWAIT)) == NULL) {
|
|
REASON_SET(&ctx->reason, PFRES_MEMORY);
|
|
return (PF_TEST_FAIL);
|
|
}
|
|
ctx->ri->r = r;
|
|
/* order is irrelevant */
|
|
SLIST_INSERT_HEAD(&ctx->rules, ctx->ri, entry);
|
|
ctx->ri = NULL;
|
|
pf_rule_to_actions(r, &ctx->act);
|
|
if (r->rule_flag & PFRULE_AFTO)
|
|
ctx->pd->naf = r->naf;
|
|
if (pf_get_transaddr(r, ctx->pd, ctx->sns,
|
|
&ctx->nr) == -1) {
|
|
REASON_SET(&ctx->reason,
|
|
PFRES_TRANSLATE);
|
|
return (PF_TEST_FAIL);
|
|
}
|
|
#if NPFLOG > 0
|
|
if (r->log) {
|
|
REASON_SET(&ctx->reason, PFRES_MATCH);
|
|
pflog_packet(ctx->pd, ctx->reason, r,
|
|
ctx->a, ruleset, NULL);
|
|
}
|
|
#endif /* NPFLOG > 0 */
|
|
} else {
|
|
/*
|
|
* found matching r
|
|
*/
|
|
*ctx->rm = r;
|
|
/*
|
|
* anchor, with ruleset, where r belongs to
|
|
*/
|
|
*ctx->am = ctx->a;
|
|
/*
|
|
* ruleset where r belongs to
|
|
*/
|
|
*ctx->rsm = ruleset;
|
|
/*
|
|
* ruleset, where anchor belongs to.
|
|
*/
|
|
ctx->arsm = ctx->aruleset;
|
|
}
|
|
|
|
#if NPFLOG > 0
|
|
if (ctx->act.log & PF_LOG_MATCHES)
|
|
pf_log_matches(ctx->pd, r, ctx->a, ruleset,
|
|
&ctx->rules);
|
|
#endif /* NPFLOG > 0 */
|
|
|
|
if (r->quick)
|
|
return (PF_TEST_QUICK);
|
|
} else {
|
|
ctx->a = r;
|
|
ctx->aruleset = &r->anchor->ruleset;
|
|
if (r->anchor_wildcard) {
|
|
RB_FOREACH(child, pf_anchor_node,
|
|
&r->anchor->children) {
|
|
if (pf_anchor_stack_push(ruleset, r,
|
|
child, PF_NEXT_CHILD) != 0)
|
|
return (PF_TEST_FAIL);
|
|
|
|
ruleset = &child->ruleset;
|
|
goto enter_ruleset;
|
|
next_child:
|
|
continue; /* with RB_FOREACH() */
|
|
}
|
|
} else {
|
|
if (pf_anchor_stack_push(ruleset, r, child,
|
|
PF_NEXT_RULE) != 0)
|
|
return (PF_TEST_FAIL);
|
|
|
|
ruleset = &r->anchor->ruleset;
|
|
child = NULL;
|
|
goto enter_ruleset;
|
|
next_rule:
|
|
;
|
|
}
|
|
}
|
|
r = TAILQ_NEXT(r, entries);
|
|
}
|
|
|
|
if (pf_anchor_stack_pop(&ruleset, &r, &child, &target) == 0) {
|
|
/* stop if any rule matched within quick anchors. */
|
|
if (r->quick == PF_TEST_QUICK && *ctx->am == r)
|
|
return (PF_TEST_QUICK);
|
|
|
|
switch (target) {
|
|
case PF_NEXT_CHILD:
|
|
goto next_child;
|
|
case PF_NEXT_RULE:
|
|
goto next_rule;
|
|
default:
|
|
panic("%s: unknown jump target", __func__);
|
|
}
|
|
}
|
|
|
|
return (PF_TEST_OK);
|
|
}
|
|
|
|
int
|
|
pf_test_rule(struct pf_pdesc *pd, struct pf_rule **rm, struct pf_state **sm,
|
|
struct pf_rule **am, struct pf_ruleset **rsm, u_short *reason)
|
|
{
|
|
struct pf_rule *r = NULL;
|
|
struct pf_rule *a = NULL;
|
|
struct pf_ruleset *ruleset = NULL;
|
|
struct pf_state_key *skw = NULL, *sks = NULL;
|
|
int rewrite = 0;
|
|
u_int16_t virtual_type, virtual_id;
|
|
int action = PF_DROP;
|
|
struct pf_test_ctx ctx;
|
|
int rv;
|
|
|
|
PF_ASSERT_LOCKED();
|
|
|
|
memset(&ctx, 0, sizeof(ctx));
|
|
ctx.pd = pd;
|
|
ctx.rm = rm;
|
|
ctx.am = am;
|
|
ctx.rsm = rsm;
|
|
ctx.th = &pd->hdr.tcp;
|
|
ctx.act.rtableid = pd->rdomain;
|
|
ctx.tag = -1;
|
|
SLIST_INIT(&ctx.rules);
|
|
|
|
if (pd->dir == PF_IN && if_congested()) {
|
|
REASON_SET(&ctx.reason, PFRES_CONGEST);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
switch (pd->virtual_proto) {
|
|
case IPPROTO_ICMP:
|
|
ctx.icmptype = pd->hdr.icmp.icmp_type;
|
|
ctx.icmpcode = pd->hdr.icmp.icmp_code;
|
|
ctx.state_icmp = pf_icmp_mapping(pd, ctx.icmptype,
|
|
&ctx.icmp_dir, &virtual_id, &virtual_type);
|
|
if (ctx.icmp_dir == PF_IN) {
|
|
pd->osport = pd->nsport = virtual_id;
|
|
pd->odport = pd->ndport = virtual_type;
|
|
} else {
|
|
pd->osport = pd->nsport = virtual_type;
|
|
pd->odport = pd->ndport = virtual_id;
|
|
}
|
|
break;
|
|
#ifdef INET6
|
|
case IPPROTO_ICMPV6:
|
|
ctx.icmptype = pd->hdr.icmp6.icmp6_type;
|
|
ctx.icmpcode = pd->hdr.icmp6.icmp6_code;
|
|
ctx.state_icmp = pf_icmp_mapping(pd, ctx.icmptype,
|
|
&ctx.icmp_dir, &virtual_id, &virtual_type);
|
|
if (ctx.icmp_dir == PF_IN) {
|
|
pd->osport = pd->nsport = virtual_id;
|
|
pd->odport = pd->ndport = virtual_type;
|
|
} else {
|
|
pd->osport = pd->nsport = virtual_type;
|
|
pd->odport = pd->ndport = virtual_id;
|
|
}
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
|
|
ruleset = &pf_main_ruleset;
|
|
rv = pf_match_rule(&ctx, ruleset);
|
|
if (rv == PF_TEST_FAIL) {
|
|
/*
|
|
* Reason has been set in pf_match_rule() already.
|
|
*/
|
|
goto cleanup;
|
|
}
|
|
|
|
r = *ctx.rm; /* matching rule */
|
|
a = *ctx.am; /* rule that defines an anchor containing 'r' */
|
|
ruleset = *ctx.rsm;/* ruleset of the anchor defined by the rule 'a' */
|
|
ctx.aruleset = ctx.arsm;/* ruleset of the 'a' rule itself */
|
|
|
|
/* apply actions for last matching pass/block rule */
|
|
pf_rule_to_actions(r, &ctx.act);
|
|
if (r->rule_flag & PFRULE_AFTO)
|
|
pd->naf = r->naf;
|
|
if (pf_get_transaddr(r, pd, ctx.sns, &ctx.nr) == -1) {
|
|
REASON_SET(&ctx.reason, PFRES_TRANSLATE);
|
|
goto cleanup;
|
|
}
|
|
REASON_SET(&ctx.reason, PFRES_MATCH);
|
|
|
|
#if NPFLOG > 0
|
|
if (r->log)
|
|
pflog_packet(pd, ctx.reason, r, a, ruleset, NULL);
|
|
if (ctx.act.log & PF_LOG_MATCHES)
|
|
pf_log_matches(pd, r, a, ruleset, &ctx.rules);
|
|
#endif /* NPFLOG > 0 */
|
|
|
|
if (pd->virtual_proto != PF_VPROTO_FRAGMENT &&
|
|
(r->action == PF_DROP) &&
|
|
((r->rule_flag & PFRULE_RETURNRST) ||
|
|
(r->rule_flag & PFRULE_RETURNICMP) ||
|
|
(r->rule_flag & PFRULE_RETURN))) {
|
|
if (pd->proto == IPPROTO_TCP &&
|
|
((r->rule_flag & PFRULE_RETURNRST) ||
|
|
(r->rule_flag & PFRULE_RETURN)) &&
|
|
!(ctx.th->th_flags & TH_RST)) {
|
|
u_int32_t ack =
|
|
ntohl(ctx.th->th_seq) + pd->p_len;
|
|
|
|
if (pf_check_tcp_cksum(pd->m, pd->off,
|
|
pd->tot_len - pd->off, pd->af))
|
|
REASON_SET(&ctx.reason, PFRES_PROTCKSUM);
|
|
else {
|
|
if (ctx.th->th_flags & TH_SYN)
|
|
ack++;
|
|
if (ctx.th->th_flags & TH_FIN)
|
|
ack++;
|
|
pf_send_tcp(r, pd->af, pd->dst,
|
|
pd->src, ctx.th->th_dport,
|
|
ctx.th->th_sport, ntohl(ctx.th->th_ack),
|
|
ack, TH_RST|TH_ACK, 0, 0, r->return_ttl,
|
|
1, 0, pd->rdomain);
|
|
}
|
|
} else if ((pd->proto != IPPROTO_ICMP ||
|
|
ICMP_INFOTYPE(ctx.icmptype)) && pd->af == AF_INET &&
|
|
r->return_icmp)
|
|
pf_send_icmp(pd->m, r->return_icmp >> 8,
|
|
r->return_icmp & 255, 0, pd->af, r, pd->rdomain);
|
|
else if ((pd->proto != IPPROTO_ICMPV6 ||
|
|
(ctx.icmptype >= ICMP6_ECHO_REQUEST &&
|
|
ctx.icmptype != ND_REDIRECT)) && pd->af == AF_INET6 &&
|
|
r->return_icmp6)
|
|
pf_send_icmp(pd->m, r->return_icmp6 >> 8,
|
|
r->return_icmp6 & 255, 0, pd->af, r, pd->rdomain);
|
|
}
|
|
|
|
if (r->action == PF_DROP)
|
|
goto cleanup;
|
|
|
|
pf_tag_packet(pd->m, ctx.tag, ctx.act.rtableid);
|
|
if (ctx.act.rtableid >= 0 &&
|
|
rtable_l2(ctx.act.rtableid) != pd->rdomain)
|
|
pd->destchg = 1;
|
|
|
|
if (r->action == PF_PASS && pd->badopts != 0 && ! r->allow_opts) {
|
|
REASON_SET(&ctx.reason, PFRES_IPOPTIONS);
|
|
#if NPFLOG > 0
|
|
pd->pflog |= PF_LOG_FORCE;
|
|
#endif /* NPFLOG > 0 */
|
|
DPFPRINTF(LOG_NOTICE, "dropping packet with "
|
|
"ip/ipv6 options in pf_test_rule()");
|
|
goto cleanup;
|
|
}
|
|
|
|
if (pd->virtual_proto != PF_VPROTO_FRAGMENT
|
|
&& !ctx.state_icmp && r->keep_state) {
|
|
|
|
if (r->rule_flag & PFRULE_SRCTRACK &&
|
|
pf_insert_src_node(&ctx.sns[PF_SN_NONE], r, PF_SN_NONE,
|
|
pd->af, pd->src, NULL, NULL) != 0) {
|
|
REASON_SET(&ctx.reason, PFRES_SRCLIMIT);
|
|
goto cleanup;
|
|
}
|
|
|
|
if (r->max_states && (r->states_cur >= r->max_states)) {
|
|
pf_status.lcounters[LCNT_STATES]++;
|
|
REASON_SET(&ctx.reason, PFRES_MAXSTATES);
|
|
goto cleanup;
|
|
}
|
|
|
|
action = pf_create_state(pd, r, a, ctx.nr, &skw, &sks,
|
|
&rewrite, sm, ctx.tag, &ctx.rules, &ctx.act, ctx.sns);
|
|
|
|
if (action != PF_PASS)
|
|
goto cleanup;
|
|
if (sks != skw) {
|
|
struct pf_state_key *sk;
|
|
|
|
if (pd->dir == PF_IN)
|
|
sk = sks;
|
|
else
|
|
sk = skw;
|
|
rewrite += pf_translate(pd,
|
|
&sk->addr[pd->af == pd->naf ? pd->sidx : pd->didx],
|
|
sk->port[pd->af == pd->naf ? pd->sidx : pd->didx],
|
|
&sk->addr[pd->af == pd->naf ? pd->didx : pd->sidx],
|
|
sk->port[pd->af == pd->naf ? pd->didx : pd->sidx],
|
|
virtual_type, ctx.icmp_dir);
|
|
}
|
|
|
|
#ifdef INET6
|
|
if (rewrite && skw->af != sks->af)
|
|
action = PF_AFRT;
|
|
#endif /* INET6 */
|
|
|
|
} else {
|
|
action = PF_PASS;
|
|
|
|
while ((ctx.ri = SLIST_FIRST(&ctx.rules))) {
|
|
SLIST_REMOVE_HEAD(&ctx.rules, entry);
|
|
pool_put(&pf_rule_item_pl, ctx.ri);
|
|
}
|
|
}
|
|
|
|
/* copy back packet headers if needed */
|
|
if (rewrite && pd->hdrlen) {
|
|
m_copyback(pd->m, pd->off, pd->hdrlen, &pd->hdr, M_NOWAIT);
|
|
}
|
|
|
|
#if NPFSYNC > 0
|
|
if (*sm != NULL && !ISSET((*sm)->state_flags, PFSTATE_NOSYNC) &&
|
|
pd->dir == PF_OUT && pfsync_is_up()) {
|
|
/*
|
|
* We want the state created, but we dont
|
|
* want to send this in case a partner
|
|
* firewall has to know about it to allow
|
|
* replies through it.
|
|
*/
|
|
if (pfsync_defer(*sm, pd->m))
|
|
return (PF_DEFER);
|
|
}
|
|
#endif /* NPFSYNC > 0 */
|
|
|
|
return (action);
|
|
|
|
cleanup:
|
|
while ((ctx.ri = SLIST_FIRST(&ctx.rules))) {
|
|
SLIST_REMOVE_HEAD(&ctx.rules, entry);
|
|
pool_put(&pf_rule_item_pl, ctx.ri);
|
|
}
|
|
|
|
return (action);
|
|
}
|
|
|
|
static __inline int
|
|
pf_create_state(struct pf_pdesc *pd, struct pf_rule *r, struct pf_rule *a,
|
|
struct pf_rule *nr, struct pf_state_key **skw, struct pf_state_key **sks,
|
|
int *rewrite, struct pf_state **sm, int tag, struct pf_rule_slist *rules,
|
|
struct pf_rule_actions *act, struct pf_src_node *sns[PF_SN_MAX])
|
|
{
|
|
struct pf_state *st = NULL;
|
|
struct tcphdr *th = &pd->hdr.tcp;
|
|
u_int16_t mss = tcp_mssdflt;
|
|
u_short reason;
|
|
u_int i;
|
|
|
|
st = pool_get(&pf_state_pl, PR_NOWAIT | PR_ZERO);
|
|
if (st == NULL) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
goto csfailed;
|
|
}
|
|
st->rule.ptr = r;
|
|
st->anchor.ptr = a;
|
|
st->natrule.ptr = nr;
|
|
if (r->allow_opts)
|
|
st->state_flags |= PFSTATE_ALLOWOPTS;
|
|
if (r->rule_flag & PFRULE_STATESLOPPY)
|
|
st->state_flags |= PFSTATE_SLOPPY;
|
|
if (r->rule_flag & PFRULE_PFLOW)
|
|
st->state_flags |= PFSTATE_PFLOW;
|
|
if (r->rule_flag & PFRULE_NOSYNC)
|
|
st->state_flags |= PFSTATE_NOSYNC;
|
|
#if NPFLOG > 0
|
|
st->log = act->log & PF_LOG_ALL;
|
|
#endif /* NPFLOG > 0 */
|
|
st->qid = act->qid;
|
|
st->pqid = act->pqid;
|
|
st->rtableid[pd->didx] = act->rtableid;
|
|
st->rtableid[pd->sidx] = -1; /* return traffic is routed normally */
|
|
st->min_ttl = act->min_ttl;
|
|
st->set_tos = act->set_tos;
|
|
st->max_mss = act->max_mss;
|
|
st->state_flags |= act->flags;
|
|
#if NPFSYNC > 0
|
|
st->sync_state = PFSYNC_S_NONE;
|
|
#endif /* NPFSYNC > 0 */
|
|
st->set_prio[0] = act->set_prio[0];
|
|
st->set_prio[1] = act->set_prio[1];
|
|
st->delay = act->delay;
|
|
SLIST_INIT(&st->src_nodes);
|
|
|
|
/*
|
|
* must initialize refcnt, before pf_state_insert() gets called.
|
|
* pf_state_inserts() grabs reference for pfsync!
|
|
*/
|
|
PF_REF_INIT(st->refcnt);
|
|
mtx_init(&st->mtx, IPL_NET);
|
|
|
|
switch (pd->proto) {
|
|
case IPPROTO_TCP:
|
|
st->src.seqlo = ntohl(th->th_seq);
|
|
st->src.seqhi = st->src.seqlo + pd->p_len + 1;
|
|
if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
|
|
r->keep_state == PF_STATE_MODULATE) {
|
|
/* Generate sequence number modulator */
|
|
st->src.seqdiff = pf_tcp_iss(pd) - st->src.seqlo;
|
|
if (st->src.seqdiff == 0)
|
|
st->src.seqdiff = 1;
|
|
pf_patch_32(pd, &th->th_seq,
|
|
htonl(st->src.seqlo + st->src.seqdiff));
|
|
*rewrite = 1;
|
|
} else
|
|
st->src.seqdiff = 0;
|
|
if (th->th_flags & TH_SYN) {
|
|
st->src.seqhi++;
|
|
st->src.wscale = pf_get_wscale(pd);
|
|
}
|
|
st->src.max_win = MAX(ntohs(th->th_win), 1);
|
|
if (st->src.wscale & PF_WSCALE_MASK) {
|
|
/* Remove scale factor from initial window */
|
|
int win = st->src.max_win;
|
|
win += 1 << (st->src.wscale & PF_WSCALE_MASK);
|
|
st->src.max_win = (win - 1) >>
|
|
(st->src.wscale & PF_WSCALE_MASK);
|
|
}
|
|
if (th->th_flags & TH_FIN)
|
|
st->src.seqhi++;
|
|
st->dst.seqhi = 1;
|
|
st->dst.max_win = 1;
|
|
pf_set_protostate(st, PF_PEER_SRC, TCPS_SYN_SENT);
|
|
pf_set_protostate(st, PF_PEER_DST, TCPS_CLOSED);
|
|
st->timeout = PFTM_TCP_FIRST_PACKET;
|
|
pf_status.states_halfopen++;
|
|
break;
|
|
case IPPROTO_UDP:
|
|
pf_set_protostate(st, PF_PEER_SRC, PFUDPS_SINGLE);
|
|
pf_set_protostate(st, PF_PEER_DST, PFUDPS_NO_TRAFFIC);
|
|
st->timeout = PFTM_UDP_FIRST_PACKET;
|
|
break;
|
|
case IPPROTO_ICMP:
|
|
#ifdef INET6
|
|
case IPPROTO_ICMPV6:
|
|
#endif /* INET6 */
|
|
st->timeout = PFTM_ICMP_FIRST_PACKET;
|
|
break;
|
|
default:
|
|
pf_set_protostate(st, PF_PEER_SRC, PFOTHERS_SINGLE);
|
|
pf_set_protostate(st, PF_PEER_DST, PFOTHERS_NO_TRAFFIC);
|
|
st->timeout = PFTM_OTHER_FIRST_PACKET;
|
|
}
|
|
|
|
st->creation = getuptime();
|
|
st->expire = getuptime();
|
|
|
|
if (pd->proto == IPPROTO_TCP) {
|
|
if (st->state_flags & PFSTATE_SCRUB_TCP &&
|
|
pf_normalize_tcp_init(pd, &st->src)) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
goto csfailed;
|
|
}
|
|
if (st->state_flags & PFSTATE_SCRUB_TCP && st->src.scrub &&
|
|
pf_normalize_tcp_stateful(pd, &reason, st,
|
|
&st->src, &st->dst, rewrite)) {
|
|
/* This really shouldn't happen!!! */
|
|
DPFPRINTF(LOG_ERR,
|
|
"%s: tcp normalize failed on first pkt", __func__);
|
|
goto csfailed;
|
|
}
|
|
}
|
|
st->direction = pd->dir;
|
|
|
|
if (pf_state_key_setup(pd, skw, sks, act->rtableid)) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
goto csfailed;
|
|
}
|
|
|
|
if (pf_set_rt_ifp(st, pd->src, (*skw)->af, sns) != 0) {
|
|
REASON_SET(&reason, PFRES_NOROUTE);
|
|
goto csfailed;
|
|
}
|
|
|
|
for (i = 0; i < PF_SN_MAX; i++)
|
|
if (sns[i] != NULL) {
|
|
struct pf_sn_item *sni;
|
|
|
|
sni = pool_get(&pf_sn_item_pl, PR_NOWAIT);
|
|
if (sni == NULL) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
goto csfailed;
|
|
}
|
|
sni->sn = sns[i];
|
|
SLIST_INSERT_HEAD(&st->src_nodes, sni, next);
|
|
sni->sn->states++;
|
|
}
|
|
|
|
#if NPFSYNC > 0
|
|
pfsync_init_state(st, *skw, *sks, 0);
|
|
#endif
|
|
|
|
if (pf_state_insert(BOUND_IFACE(r, pd->kif), skw, sks, st)) {
|
|
*sks = *skw = NULL;
|
|
REASON_SET(&reason, PFRES_STATEINS);
|
|
goto csfailed;
|
|
} else
|
|
*sm = st;
|
|
|
|
/*
|
|
* Make state responsible for rules it binds here.
|
|
*/
|
|
memcpy(&st->match_rules, rules, sizeof(st->match_rules));
|
|
memset(rules, 0, sizeof(*rules));
|
|
STATE_INC_COUNTERS(st);
|
|
|
|
if (tag > 0) {
|
|
pf_tag_ref(tag);
|
|
st->tag = tag;
|
|
}
|
|
if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
|
|
TH_SYN && r->keep_state == PF_STATE_SYNPROXY && pd->dir == PF_IN) {
|
|
int rtid = pd->rdomain;
|
|
if (act->rtableid >= 0)
|
|
rtid = act->rtableid;
|
|
pf_set_protostate(st, PF_PEER_SRC, PF_TCPS_PROXY_SRC);
|
|
st->src.seqhi = arc4random();
|
|
/* Find mss option */
|
|
mss = pf_get_mss(pd);
|
|
mss = pf_calc_mss(pd->src, pd->af, rtid, mss);
|
|
mss = pf_calc_mss(pd->dst, pd->af, rtid, mss);
|
|
st->src.mss = mss;
|
|
pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport,
|
|
th->th_sport, st->src.seqhi, ntohl(th->th_seq) + 1,
|
|
TH_SYN|TH_ACK, 0, st->src.mss, 0, 1, 0, pd->rdomain);
|
|
REASON_SET(&reason, PFRES_SYNPROXY);
|
|
return (PF_SYNPROXY_DROP);
|
|
}
|
|
|
|
return (PF_PASS);
|
|
|
|
csfailed:
|
|
if (st) {
|
|
pf_normalize_tcp_cleanup(st); /* safe even w/o init */
|
|
pf_src_tree_remove_state(st);
|
|
pool_put(&pf_state_pl, st);
|
|
}
|
|
|
|
for (i = 0; i < PF_SN_MAX; i++)
|
|
if (sns[i] != NULL)
|
|
pf_remove_src_node(sns[i]);
|
|
|
|
return (PF_DROP);
|
|
}
|
|
|
|
int
|
|
pf_translate(struct pf_pdesc *pd, struct pf_addr *saddr, u_int16_t sport,
|
|
struct pf_addr *daddr, u_int16_t dport, u_int16_t virtual_type,
|
|
int icmp_dir)
|
|
{
|
|
int rewrite = 0;
|
|
int afto = pd->af != pd->naf;
|
|
|
|
if (afto || PF_ANEQ(daddr, pd->dst, pd->af))
|
|
pd->destchg = 1;
|
|
|
|
switch (pd->proto) {
|
|
case IPPROTO_TCP: /* FALLTHROUGH */
|
|
case IPPROTO_UDP:
|
|
rewrite += pf_patch_16(pd, pd->sport, sport);
|
|
rewrite += pf_patch_16(pd, pd->dport, dport);
|
|
break;
|
|
|
|
case IPPROTO_ICMP:
|
|
if (pd->af != AF_INET)
|
|
return (0);
|
|
|
|
#ifdef INET6
|
|
if (afto) {
|
|
if (pf_translate_icmp_af(pd, AF_INET6, &pd->hdr.icmp))
|
|
return (0);
|
|
pd->proto = IPPROTO_ICMPV6;
|
|
rewrite = 1;
|
|
}
|
|
#endif /* INET6 */
|
|
if (virtual_type == htons(ICMP_ECHO)) {
|
|
u_int16_t icmpid = (icmp_dir == PF_IN) ? sport : dport;
|
|
rewrite += pf_patch_16(pd,
|
|
&pd->hdr.icmp.icmp_id, icmpid);
|
|
}
|
|
break;
|
|
|
|
#ifdef INET6
|
|
case IPPROTO_ICMPV6:
|
|
if (pd->af != AF_INET6)
|
|
return (0);
|
|
|
|
if (afto) {
|
|
if (pf_translate_icmp_af(pd, AF_INET, &pd->hdr.icmp6))
|
|
return (0);
|
|
pd->proto = IPPROTO_ICMP;
|
|
rewrite = 1;
|
|
}
|
|
if (virtual_type == htons(ICMP6_ECHO_REQUEST)) {
|
|
u_int16_t icmpid = (icmp_dir == PF_IN) ? sport : dport;
|
|
rewrite += pf_patch_16(pd,
|
|
&pd->hdr.icmp6.icmp6_id, icmpid);
|
|
}
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
|
|
if (!afto) {
|
|
rewrite += pf_translate_a(pd, pd->src, saddr);
|
|
rewrite += pf_translate_a(pd, pd->dst, daddr);
|
|
}
|
|
|
|
return (rewrite);
|
|
}
|
|
|
|
int
|
|
pf_tcp_track_full(struct pf_pdesc *pd, struct pf_state **stp, u_short *reason,
|
|
int *copyback, int reverse)
|
|
{
|
|
struct tcphdr *th = &pd->hdr.tcp;
|
|
struct pf_state_peer *src, *dst;
|
|
u_int16_t win = ntohs(th->th_win);
|
|
u_int32_t ack, end, data_end, seq, orig_seq;
|
|
u_int8_t sws, dws, psrc, pdst;
|
|
int ackskew;
|
|
|
|
if ((pd->dir == (*stp)->direction && !reverse) ||
|
|
(pd->dir != (*stp)->direction && reverse)) {
|
|
src = &(*stp)->src;
|
|
dst = &(*stp)->dst;
|
|
psrc = PF_PEER_SRC;
|
|
pdst = PF_PEER_DST;
|
|
} else {
|
|
src = &(*stp)->dst;
|
|
dst = &(*stp)->src;
|
|
psrc = PF_PEER_DST;
|
|
pdst = PF_PEER_SRC;
|
|
}
|
|
|
|
if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
|
|
sws = src->wscale & PF_WSCALE_MASK;
|
|
dws = dst->wscale & PF_WSCALE_MASK;
|
|
} else
|
|
sws = dws = 0;
|
|
|
|
/*
|
|
* Sequence tracking algorithm from Guido van Rooij's paper:
|
|
* http://www.madison-gurkha.com/publications/tcp_filtering/
|
|
* tcp_filtering.ps
|
|
*/
|
|
|
|
orig_seq = seq = ntohl(th->th_seq);
|
|
if (src->seqlo == 0) {
|
|
/* First packet from this end. Set its state */
|
|
|
|
if (((*stp)->state_flags & PFSTATE_SCRUB_TCP || dst->scrub) &&
|
|
src->scrub == NULL) {
|
|
if (pf_normalize_tcp_init(pd, src)) {
|
|
REASON_SET(reason, PFRES_MEMORY);
|
|
return (PF_DROP);
|
|
}
|
|
}
|
|
|
|
/* Deferred generation of sequence number modulator */
|
|
if (dst->seqdiff && !src->seqdiff) {
|
|
/* use random iss for the TCP server */
|
|
while ((src->seqdiff = arc4random() - seq) == 0)
|
|
continue;
|
|
ack = ntohl(th->th_ack) - dst->seqdiff;
|
|
pf_patch_32(pd, &th->th_seq, htonl(seq + src->seqdiff));
|
|
pf_patch_32(pd, &th->th_ack, htonl(ack));
|
|
*copyback = 1;
|
|
} else {
|
|
ack = ntohl(th->th_ack);
|
|
}
|
|
|
|
end = seq + pd->p_len;
|
|
if (th->th_flags & TH_SYN) {
|
|
end++;
|
|
if (dst->wscale & PF_WSCALE_FLAG) {
|
|
src->wscale = pf_get_wscale(pd);
|
|
if (src->wscale & PF_WSCALE_FLAG) {
|
|
/* Remove scale factor from initial
|
|
* window */
|
|
sws = src->wscale & PF_WSCALE_MASK;
|
|
win = ((u_int32_t)win + (1 << sws) - 1)
|
|
>> sws;
|
|
dws = dst->wscale & PF_WSCALE_MASK;
|
|
} else {
|
|
/* fixup other window */
|
|
dst->max_win = MIN(TCP_MAXWIN,
|
|
(u_int32_t)dst->max_win <<
|
|
(dst->wscale & PF_WSCALE_MASK));
|
|
/* in case of a retrans SYN|ACK */
|
|
dst->wscale = 0;
|
|
}
|
|
}
|
|
}
|
|
data_end = end;
|
|
if (th->th_flags & TH_FIN)
|
|
end++;
|
|
|
|
src->seqlo = seq;
|
|
if (src->state < TCPS_SYN_SENT)
|
|
pf_set_protostate(*stp, psrc, TCPS_SYN_SENT);
|
|
|
|
/*
|
|
* May need to slide the window (seqhi may have been set by
|
|
* the crappy stack check or if we picked up the connection
|
|
* after establishment)
|
|
*/
|
|
if (src->seqhi == 1 ||
|
|
SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
|
|
src->seqhi = end + MAX(1, dst->max_win << dws);
|
|
if (win > src->max_win)
|
|
src->max_win = win;
|
|
|
|
} else {
|
|
ack = ntohl(th->th_ack) - dst->seqdiff;
|
|
if (src->seqdiff) {
|
|
/* Modulate sequence numbers */
|
|
pf_patch_32(pd, &th->th_seq, htonl(seq + src->seqdiff));
|
|
pf_patch_32(pd, &th->th_ack, htonl(ack));
|
|
*copyback = 1;
|
|
}
|
|
end = seq + pd->p_len;
|
|
if (th->th_flags & TH_SYN)
|
|
end++;
|
|
data_end = end;
|
|
if (th->th_flags & TH_FIN)
|
|
end++;
|
|
}
|
|
|
|
if ((th->th_flags & TH_ACK) == 0) {
|
|
/* Let it pass through the ack skew check */
|
|
ack = dst->seqlo;
|
|
} else if ((ack == 0 &&
|
|
(th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
|
|
/* broken tcp stacks do not set ack */
|
|
(dst->state < TCPS_SYN_SENT)) {
|
|
/*
|
|
* Many stacks (ours included) will set the ACK number in an
|
|
* FIN|ACK if the SYN times out -- no sequence to ACK.
|
|
*/
|
|
ack = dst->seqlo;
|
|
}
|
|
|
|
if (seq == end) {
|
|
/* Ease sequencing restrictions on no data packets */
|
|
seq = src->seqlo;
|
|
data_end = end = seq;
|
|
}
|
|
|
|
ackskew = dst->seqlo - ack;
|
|
|
|
|
|
/*
|
|
* Need to demodulate the sequence numbers in any TCP SACK options
|
|
* (Selective ACK). We could optionally validate the SACK values
|
|
* against the current ACK window, either forwards or backwards, but
|
|
* I'm not confident that SACK has been implemented properly
|
|
* everywhere. It wouldn't surprise me if several stacks accidently
|
|
* SACK too far backwards of previously ACKed data. There really aren't
|
|
* any security implications of bad SACKing unless the target stack
|
|
* doesn't validate the option length correctly. Someone trying to
|
|
* spoof into a TCP connection won't bother blindly sending SACK
|
|
* options anyway.
|
|
*/
|
|
if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
|
|
if (pf_modulate_sack(pd, dst))
|
|
*copyback = 1;
|
|
}
|
|
|
|
|
|
#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */
|
|
if (SEQ_GEQ(src->seqhi, data_end) &&
|
|
/* Last octet inside other's window space */
|
|
SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
|
|
/* Retrans: not more than one window back */
|
|
(ackskew >= -MAXACKWINDOW) &&
|
|
/* Acking not more than one reassembled fragment backwards */
|
|
(ackskew <= (MAXACKWINDOW << sws)) &&
|
|
/* Acking not more than one window forward */
|
|
((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
|
|
(orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo))) {
|
|
/* Require an exact/+1 sequence match on resets when possible */
|
|
|
|
if (dst->scrub || src->scrub) {
|
|
if (pf_normalize_tcp_stateful(pd, reason, *stp, src,
|
|
dst, copyback))
|
|
return (PF_DROP);
|
|
}
|
|
|
|
/* update max window */
|
|
if (src->max_win < win)
|
|
src->max_win = win;
|
|
/* synchronize sequencing */
|
|
if (SEQ_GT(end, src->seqlo))
|
|
src->seqlo = end;
|
|
/* slide the window of what the other end can send */
|
|
if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
|
|
dst->seqhi = ack + MAX((win << sws), 1);
|
|
|
|
/* update states */
|
|
if (th->th_flags & TH_SYN)
|
|
if (src->state < TCPS_SYN_SENT)
|
|
pf_set_protostate(*stp, psrc, TCPS_SYN_SENT);
|
|
if (th->th_flags & TH_FIN)
|
|
if (src->state < TCPS_CLOSING)
|
|
pf_set_protostate(*stp, psrc, TCPS_CLOSING);
|
|
if (th->th_flags & TH_ACK) {
|
|
if (dst->state == TCPS_SYN_SENT) {
|
|
pf_set_protostate(*stp, pdst,
|
|
TCPS_ESTABLISHED);
|
|
if (src->state == TCPS_ESTABLISHED &&
|
|
!SLIST_EMPTY(&(*stp)->src_nodes) &&
|
|
pf_src_connlimit(stp)) {
|
|
REASON_SET(reason, PFRES_SRCLIMIT);
|
|
return (PF_DROP);
|
|
}
|
|
} else if (dst->state == TCPS_CLOSING)
|
|
pf_set_protostate(*stp, pdst,
|
|
TCPS_FIN_WAIT_2);
|
|
}
|
|
if (th->th_flags & TH_RST)
|
|
pf_set_protostate(*stp, PF_PEER_BOTH, TCPS_TIME_WAIT);
|
|
|
|
/* update expire time */
|
|
(*stp)->expire = getuptime();
|
|
if (src->state >= TCPS_FIN_WAIT_2 &&
|
|
dst->state >= TCPS_FIN_WAIT_2)
|
|
pf_update_state_timeout(*stp, PFTM_TCP_CLOSED);
|
|
else if (src->state >= TCPS_CLOSING &&
|
|
dst->state >= TCPS_CLOSING)
|
|
pf_update_state_timeout(*stp, PFTM_TCP_FIN_WAIT);
|
|
else if (src->state < TCPS_ESTABLISHED ||
|
|
dst->state < TCPS_ESTABLISHED)
|
|
pf_update_state_timeout(*stp, PFTM_TCP_OPENING);
|
|
else if (src->state >= TCPS_CLOSING ||
|
|
dst->state >= TCPS_CLOSING)
|
|
pf_update_state_timeout(*stp, PFTM_TCP_CLOSING);
|
|
else
|
|
pf_update_state_timeout(*stp, PFTM_TCP_ESTABLISHED);
|
|
|
|
/* Fall through to PASS packet */
|
|
} else if ((dst->state < TCPS_SYN_SENT ||
|
|
dst->state >= TCPS_FIN_WAIT_2 ||
|
|
src->state >= TCPS_FIN_WAIT_2) &&
|
|
SEQ_GEQ(src->seqhi + MAXACKWINDOW, data_end) &&
|
|
/* Within a window forward of the originating packet */
|
|
SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
|
|
/* Within a window backward of the originating packet */
|
|
|
|
/*
|
|
* This currently handles three situations:
|
|
* 1) Stupid stacks will shotgun SYNs before their peer
|
|
* replies.
|
|
* 2) When PF catches an already established stream (the
|
|
* firewall rebooted, the state table was flushed, routes
|
|
* changed...)
|
|
* 3) Packets get funky immediately after the connection
|
|
* closes (this should catch Solaris spurious ACK|FINs
|
|
* that web servers like to spew after a close)
|
|
*
|
|
* This must be a little more careful than the above code
|
|
* since packet floods will also be caught here. We don't
|
|
* update the TTL here to mitigate the damage of a packet
|
|
* flood and so the same code can handle awkward establishment
|
|
* and a loosened connection close.
|
|
* In the establishment case, a correct peer response will
|
|
* validate the connection, go through the normal state code
|
|
* and keep updating the state TTL.
|
|
*/
|
|
|
|
if (pf_status.debug >= LOG_NOTICE) {
|
|
log(LOG_NOTICE, "pf: loose state match: ");
|
|
pf_print_state(*stp);
|
|
pf_print_flags(th->th_flags);
|
|
addlog(" seq=%u (%u) ack=%u len=%u ackskew=%d "
|
|
"pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack,
|
|
pd->p_len, ackskew, (*stp)->packets[0],
|
|
(*stp)->packets[1],
|
|
pd->dir == PF_IN ? "in" : "out",
|
|
pd->dir == (*stp)->direction ? "fwd" : "rev");
|
|
}
|
|
|
|
if (dst->scrub || src->scrub) {
|
|
if (pf_normalize_tcp_stateful(pd, reason, *stp, src,
|
|
dst, copyback))
|
|
return (PF_DROP);
|
|
}
|
|
|
|
/* update max window */
|
|
if (src->max_win < win)
|
|
src->max_win = win;
|
|
/* synchronize sequencing */
|
|
if (SEQ_GT(end, src->seqlo))
|
|
src->seqlo = end;
|
|
/* slide the window of what the other end can send */
|
|
if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
|
|
dst->seqhi = ack + MAX((win << sws), 1);
|
|
|
|
/*
|
|
* Cannot set dst->seqhi here since this could be a shotgunned
|
|
* SYN and not an already established connection.
|
|
*/
|
|
if (th->th_flags & TH_FIN)
|
|
if (src->state < TCPS_CLOSING)
|
|
pf_set_protostate(*stp, psrc, TCPS_CLOSING);
|
|
if (th->th_flags & TH_RST)
|
|
pf_set_protostate(*stp, PF_PEER_BOTH, TCPS_TIME_WAIT);
|
|
|
|
/* Fall through to PASS packet */
|
|
} else {
|
|
if ((*stp)->dst.state == TCPS_SYN_SENT &&
|
|
(*stp)->src.state == TCPS_SYN_SENT) {
|
|
/* Send RST for state mismatches during handshake */
|
|
if (!(th->th_flags & TH_RST))
|
|
pf_send_tcp((*stp)->rule.ptr, pd->af,
|
|
pd->dst, pd->src, th->th_dport,
|
|
th->th_sport, ntohl(th->th_ack), 0,
|
|
TH_RST, 0, 0,
|
|
(*stp)->rule.ptr->return_ttl, 1, 0,
|
|
pd->rdomain);
|
|
src->seqlo = 0;
|
|
src->seqhi = 1;
|
|
src->max_win = 1;
|
|
} else if (pf_status.debug >= LOG_NOTICE) {
|
|
log(LOG_NOTICE, "pf: BAD state: ");
|
|
pf_print_state(*stp);
|
|
pf_print_flags(th->th_flags);
|
|
addlog(" seq=%u (%u) ack=%u len=%u ackskew=%d "
|
|
"pkts=%llu:%llu dir=%s,%s\n",
|
|
seq, orig_seq, ack, pd->p_len, ackskew,
|
|
(*stp)->packets[0], (*stp)->packets[1],
|
|
pd->dir == PF_IN ? "in" : "out",
|
|
pd->dir == (*stp)->direction ? "fwd" : "rev");
|
|
addlog("pf: State failure on: %c %c %c %c | %c %c\n",
|
|
SEQ_GEQ(src->seqhi, data_end) ? ' ' : '1',
|
|
SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
|
|
' ': '2',
|
|
(ackskew >= -MAXACKWINDOW) ? ' ' : '3',
|
|
(ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
|
|
SEQ_GEQ(src->seqhi + MAXACKWINDOW, data_end) ?
|
|
' ' :'5',
|
|
SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
|
|
}
|
|
REASON_SET(reason, PFRES_BADSTATE);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
return (PF_PASS);
|
|
}
|
|
|
|
int
|
|
pf_tcp_track_sloppy(struct pf_pdesc *pd, struct pf_state **stp,
|
|
u_short *reason)
|
|
{
|
|
struct tcphdr *th = &pd->hdr.tcp;
|
|
struct pf_state_peer *src, *dst;
|
|
u_int8_t psrc, pdst;
|
|
|
|
if (pd->dir == (*stp)->direction) {
|
|
src = &(*stp)->src;
|
|
dst = &(*stp)->dst;
|
|
psrc = PF_PEER_SRC;
|
|
pdst = PF_PEER_DST;
|
|
} else {
|
|
src = &(*stp)->dst;
|
|
dst = &(*stp)->src;
|
|
psrc = PF_PEER_DST;
|
|
pdst = PF_PEER_SRC;
|
|
}
|
|
|
|
if (th->th_flags & TH_SYN)
|
|
if (src->state < TCPS_SYN_SENT)
|
|
pf_set_protostate(*stp, psrc, TCPS_SYN_SENT);
|
|
if (th->th_flags & TH_FIN)
|
|
if (src->state < TCPS_CLOSING)
|
|
pf_set_protostate(*stp, psrc, TCPS_CLOSING);
|
|
if (th->th_flags & TH_ACK) {
|
|
if (dst->state == TCPS_SYN_SENT) {
|
|
pf_set_protostate(*stp, pdst, TCPS_ESTABLISHED);
|
|
if (src->state == TCPS_ESTABLISHED &&
|
|
!SLIST_EMPTY(&(*stp)->src_nodes) &&
|
|
pf_src_connlimit(stp)) {
|
|
REASON_SET(reason, PFRES_SRCLIMIT);
|
|
return (PF_DROP);
|
|
}
|
|
} else if (dst->state == TCPS_CLOSING) {
|
|
pf_set_protostate(*stp, pdst, TCPS_FIN_WAIT_2);
|
|
} else if (src->state == TCPS_SYN_SENT &&
|
|
dst->state < TCPS_SYN_SENT) {
|
|
/*
|
|
* Handle a special sloppy case where we only see one
|
|
* half of the connection. If there is a ACK after
|
|
* the initial SYN without ever seeing a packet from
|
|
* the destination, set the connection to established.
|
|
*/
|
|
pf_set_protostate(*stp, PF_PEER_BOTH,
|
|
TCPS_ESTABLISHED);
|
|
if (!SLIST_EMPTY(&(*stp)->src_nodes) &&
|
|
pf_src_connlimit(stp)) {
|
|
REASON_SET(reason, PFRES_SRCLIMIT);
|
|
return (PF_DROP);
|
|
}
|
|
} else if (src->state == TCPS_CLOSING &&
|
|
dst->state == TCPS_ESTABLISHED &&
|
|
dst->seqlo == 0) {
|
|
/*
|
|
* Handle the closing of half connections where we
|
|
* don't see the full bidirectional FIN/ACK+ACK
|
|
* handshake.
|
|
*/
|
|
pf_set_protostate(*stp, pdst, TCPS_CLOSING);
|
|
}
|
|
}
|
|
if (th->th_flags & TH_RST)
|
|
pf_set_protostate(*stp, PF_PEER_BOTH, TCPS_TIME_WAIT);
|
|
|
|
/* update expire time */
|
|
(*stp)->expire = getuptime();
|
|
if (src->state >= TCPS_FIN_WAIT_2 &&
|
|
dst->state >= TCPS_FIN_WAIT_2)
|
|
pf_update_state_timeout(*stp, PFTM_TCP_CLOSED);
|
|
else if (src->state >= TCPS_CLOSING &&
|
|
dst->state >= TCPS_CLOSING)
|
|
pf_update_state_timeout(*stp, PFTM_TCP_FIN_WAIT);
|
|
else if (src->state < TCPS_ESTABLISHED ||
|
|
dst->state < TCPS_ESTABLISHED)
|
|
pf_update_state_timeout(*stp, PFTM_TCP_OPENING);
|
|
else if (src->state >= TCPS_CLOSING ||
|
|
dst->state >= TCPS_CLOSING)
|
|
pf_update_state_timeout(*stp, PFTM_TCP_CLOSING);
|
|
else
|
|
pf_update_state_timeout(*stp, PFTM_TCP_ESTABLISHED);
|
|
|
|
return (PF_PASS);
|
|
}
|
|
|
|
static __inline int
|
|
pf_synproxy(struct pf_pdesc *pd, struct pf_state **stp, u_short *reason)
|
|
{
|
|
struct pf_state_key *sk = (*stp)->key[pd->didx];
|
|
|
|
if ((*stp)->src.state == PF_TCPS_PROXY_SRC) {
|
|
struct tcphdr *th = &pd->hdr.tcp;
|
|
|
|
if (pd->dir != (*stp)->direction) {
|
|
REASON_SET(reason, PFRES_SYNPROXY);
|
|
return (PF_SYNPROXY_DROP);
|
|
}
|
|
if (th->th_flags & TH_SYN) {
|
|
if (ntohl(th->th_seq) != (*stp)->src.seqlo) {
|
|
REASON_SET(reason, PFRES_SYNPROXY);
|
|
return (PF_DROP);
|
|
}
|
|
pf_send_tcp((*stp)->rule.ptr, pd->af, pd->dst,
|
|
pd->src, th->th_dport, th->th_sport,
|
|
(*stp)->src.seqhi, ntohl(th->th_seq) + 1,
|
|
TH_SYN|TH_ACK, 0, (*stp)->src.mss, 0, 1,
|
|
0, pd->rdomain);
|
|
REASON_SET(reason, PFRES_SYNPROXY);
|
|
return (PF_SYNPROXY_DROP);
|
|
} else if ((th->th_flags & (TH_ACK|TH_RST|TH_FIN)) != TH_ACK ||
|
|
(ntohl(th->th_ack) != (*stp)->src.seqhi + 1) ||
|
|
(ntohl(th->th_seq) != (*stp)->src.seqlo + 1)) {
|
|
REASON_SET(reason, PFRES_SYNPROXY);
|
|
return (PF_DROP);
|
|
} else if (!SLIST_EMPTY(&(*stp)->src_nodes) &&
|
|
pf_src_connlimit(stp)) {
|
|
REASON_SET(reason, PFRES_SRCLIMIT);
|
|
return (PF_DROP);
|
|
} else
|
|
pf_set_protostate(*stp, PF_PEER_SRC,
|
|
PF_TCPS_PROXY_DST);
|
|
}
|
|
if ((*stp)->src.state == PF_TCPS_PROXY_DST) {
|
|
struct tcphdr *th = &pd->hdr.tcp;
|
|
|
|
if (pd->dir == (*stp)->direction) {
|
|
if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
|
|
(ntohl(th->th_ack) != (*stp)->src.seqhi + 1) ||
|
|
(ntohl(th->th_seq) != (*stp)->src.seqlo + 1)) {
|
|
REASON_SET(reason, PFRES_SYNPROXY);
|
|
return (PF_DROP);
|
|
}
|
|
(*stp)->src.max_win = MAX(ntohs(th->th_win), 1);
|
|
if ((*stp)->dst.seqhi == 1)
|
|
(*stp)->dst.seqhi = arc4random();
|
|
pf_send_tcp((*stp)->rule.ptr, pd->af,
|
|
&sk->addr[pd->sidx], &sk->addr[pd->didx],
|
|
sk->port[pd->sidx], sk->port[pd->didx],
|
|
(*stp)->dst.seqhi, 0, TH_SYN, 0,
|
|
(*stp)->src.mss, 0, 0, (*stp)->tag,
|
|
sk->rdomain);
|
|
REASON_SET(reason, PFRES_SYNPROXY);
|
|
return (PF_SYNPROXY_DROP);
|
|
} else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
|
|
(TH_SYN|TH_ACK)) ||
|
|
(ntohl(th->th_ack) != (*stp)->dst.seqhi + 1)) {
|
|
REASON_SET(reason, PFRES_SYNPROXY);
|
|
return (PF_DROP);
|
|
} else {
|
|
(*stp)->dst.max_win = MAX(ntohs(th->th_win), 1);
|
|
(*stp)->dst.seqlo = ntohl(th->th_seq);
|
|
pf_send_tcp((*stp)->rule.ptr, pd->af, pd->dst,
|
|
pd->src, th->th_dport, th->th_sport,
|
|
ntohl(th->th_ack), ntohl(th->th_seq) + 1,
|
|
TH_ACK, (*stp)->src.max_win, 0, 0, 0,
|
|
(*stp)->tag, pd->rdomain);
|
|
pf_send_tcp((*stp)->rule.ptr, pd->af,
|
|
&sk->addr[pd->sidx], &sk->addr[pd->didx],
|
|
sk->port[pd->sidx], sk->port[pd->didx],
|
|
(*stp)->src.seqhi + 1, (*stp)->src.seqlo + 1,
|
|
TH_ACK, (*stp)->dst.max_win, 0, 0, 1,
|
|
0, sk->rdomain);
|
|
(*stp)->src.seqdiff = (*stp)->dst.seqhi -
|
|
(*stp)->src.seqlo;
|
|
(*stp)->dst.seqdiff = (*stp)->src.seqhi -
|
|
(*stp)->dst.seqlo;
|
|
(*stp)->src.seqhi = (*stp)->src.seqlo +
|
|
(*stp)->dst.max_win;
|
|
(*stp)->dst.seqhi = (*stp)->dst.seqlo +
|
|
(*stp)->src.max_win;
|
|
(*stp)->src.wscale = (*stp)->dst.wscale = 0;
|
|
pf_set_protostate(*stp, PF_PEER_BOTH,
|
|
TCPS_ESTABLISHED);
|
|
REASON_SET(reason, PFRES_SYNPROXY);
|
|
return (PF_SYNPROXY_DROP);
|
|
}
|
|
}
|
|
return (PF_PASS);
|
|
}
|
|
|
|
int
|
|
pf_test_state(struct pf_pdesc *pd, struct pf_state **stp, u_short *reason)
|
|
{
|
|
int copyback = 0;
|
|
struct pf_state_peer *src, *dst;
|
|
int action;
|
|
struct inpcb *inp = pd->m->m_pkthdr.pf.inp;
|
|
u_int8_t psrc, pdst;
|
|
|
|
action = PF_PASS;
|
|
if (pd->dir == (*stp)->direction) {
|
|
src = &(*stp)->src;
|
|
dst = &(*stp)->dst;
|
|
psrc = PF_PEER_SRC;
|
|
pdst = PF_PEER_DST;
|
|
} else {
|
|
src = &(*stp)->dst;
|
|
dst = &(*stp)->src;
|
|
psrc = PF_PEER_DST;
|
|
pdst = PF_PEER_SRC;
|
|
}
|
|
|
|
switch (pd->virtual_proto) {
|
|
case IPPROTO_TCP:
|
|
if ((action = pf_synproxy(pd, stp, reason)) != PF_PASS)
|
|
return (action);
|
|
if ((pd->hdr.tcp.th_flags & (TH_SYN|TH_ACK)) == TH_SYN) {
|
|
|
|
if (dst->state >= TCPS_FIN_WAIT_2 &&
|
|
src->state >= TCPS_FIN_WAIT_2) {
|
|
if (pf_status.debug >= LOG_NOTICE) {
|
|
log(LOG_NOTICE, "pf: state reuse ");
|
|
pf_print_state(*stp);
|
|
pf_print_flags(pd->hdr.tcp.th_flags);
|
|
addlog("\n");
|
|
}
|
|
/* XXX make sure it's the same direction ?? */
|
|
pf_update_state_timeout(*stp, PFTM_PURGE);
|
|
pf_state_unref(*stp);
|
|
*stp = NULL;
|
|
pf_mbuf_link_inpcb(pd->m, inp);
|
|
return (PF_DROP);
|
|
} else if (dst->state >= TCPS_ESTABLISHED &&
|
|
src->state >= TCPS_ESTABLISHED) {
|
|
/*
|
|
* SYN matches existing state???
|
|
* Typically happens when sender boots up after
|
|
* sudden panic. Certain protocols (NFSv3) are
|
|
* always using same port numbers. Challenge
|
|
* ACK enables all parties (firewall and peers)
|
|
* to get in sync again.
|
|
*/
|
|
pf_send_challenge_ack(pd, *stp, src, dst);
|
|
return (PF_DROP);
|
|
}
|
|
}
|
|
|
|
if ((*stp)->state_flags & PFSTATE_SLOPPY) {
|
|
if (pf_tcp_track_sloppy(pd, stp, reason) == PF_DROP)
|
|
return (PF_DROP);
|
|
} else {
|
|
if (pf_tcp_track_full(pd, stp, reason, ©back,
|
|
PF_REVERSED_KEY((*stp)->key, pd->af)) == PF_DROP)
|
|
return (PF_DROP);
|
|
}
|
|
break;
|
|
case IPPROTO_UDP:
|
|
/* update states */
|
|
if (src->state < PFUDPS_SINGLE)
|
|
pf_set_protostate(*stp, psrc, PFUDPS_SINGLE);
|
|
if (dst->state == PFUDPS_SINGLE)
|
|
pf_set_protostate(*stp, pdst, PFUDPS_MULTIPLE);
|
|
|
|
/* update expire time */
|
|
(*stp)->expire = getuptime();
|
|
if (src->state == PFUDPS_MULTIPLE &&
|
|
dst->state == PFUDPS_MULTIPLE)
|
|
pf_update_state_timeout(*stp, PFTM_UDP_MULTIPLE);
|
|
else
|
|
pf_update_state_timeout(*stp, PFTM_UDP_SINGLE);
|
|
break;
|
|
default:
|
|
/* update states */
|
|
if (src->state < PFOTHERS_SINGLE)
|
|
pf_set_protostate(*stp, psrc, PFOTHERS_SINGLE);
|
|
if (dst->state == PFOTHERS_SINGLE)
|
|
pf_set_protostate(*stp, pdst, PFOTHERS_MULTIPLE);
|
|
|
|
/* update expire time */
|
|
(*stp)->expire = getuptime();
|
|
if (src->state == PFOTHERS_MULTIPLE &&
|
|
dst->state == PFOTHERS_MULTIPLE)
|
|
pf_update_state_timeout(*stp, PFTM_OTHER_MULTIPLE);
|
|
else
|
|
pf_update_state_timeout(*stp, PFTM_OTHER_SINGLE);
|
|
break;
|
|
}
|
|
|
|
/* translate source/destination address, if necessary */
|
|
if ((*stp)->key[PF_SK_WIRE] != (*stp)->key[PF_SK_STACK]) {
|
|
struct pf_state_key *nk;
|
|
int afto, sidx, didx;
|
|
|
|
if (PF_REVERSED_KEY((*stp)->key, pd->af))
|
|
nk = (*stp)->key[pd->sidx];
|
|
else
|
|
nk = (*stp)->key[pd->didx];
|
|
|
|
afto = pd->af != nk->af;
|
|
sidx = afto ? pd->didx : pd->sidx;
|
|
didx = afto ? pd->sidx : pd->didx;
|
|
|
|
#ifdef INET6
|
|
if (afto) {
|
|
pf_addrcpy(&pd->nsaddr, &nk->addr[sidx], nk->af);
|
|
pf_addrcpy(&pd->ndaddr, &nk->addr[didx], nk->af);
|
|
pd->naf = nk->af;
|
|
action = PF_AFRT;
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
if (!afto)
|
|
pf_translate_a(pd, pd->src, &nk->addr[sidx]);
|
|
|
|
if (pd->sport != NULL)
|
|
pf_patch_16(pd, pd->sport, nk->port[sidx]);
|
|
|
|
if (afto || PF_ANEQ(pd->dst, &nk->addr[didx], pd->af) ||
|
|
pd->rdomain != nk->rdomain)
|
|
pd->destchg = 1;
|
|
|
|
if (!afto)
|
|
pf_translate_a(pd, pd->dst, &nk->addr[didx]);
|
|
|
|
if (pd->dport != NULL)
|
|
pf_patch_16(pd, pd->dport, nk->port[didx]);
|
|
|
|
pd->m->m_pkthdr.ph_rtableid = nk->rdomain;
|
|
copyback = 1;
|
|
}
|
|
|
|
if (copyback && pd->hdrlen > 0) {
|
|
m_copyback(pd->m, pd->off, pd->hdrlen, &pd->hdr, M_NOWAIT);
|
|
}
|
|
|
|
return (action);
|
|
}
|
|
|
|
int
|
|
pf_icmp_state_lookup(struct pf_pdesc *pd, struct pf_state_key_cmp *key,
|
|
struct pf_state **stp, u_int16_t icmpid, u_int16_t type,
|
|
int icmp_dir, int *iidx, int multi, int inner)
|
|
{
|
|
int direction, action;
|
|
|
|
key->af = pd->af;
|
|
key->proto = pd->proto;
|
|
key->rdomain = pd->rdomain;
|
|
if (icmp_dir == PF_IN) {
|
|
*iidx = pd->sidx;
|
|
key->port[pd->sidx] = icmpid;
|
|
key->port[pd->didx] = type;
|
|
} else {
|
|
*iidx = pd->didx;
|
|
key->port[pd->sidx] = type;
|
|
key->port[pd->didx] = icmpid;
|
|
}
|
|
|
|
if (pf_state_key_addr_setup(pd, key, pd->sidx, pd->src, pd->didx,
|
|
pd->dst, pd->af, multi))
|
|
return (PF_DROP);
|
|
|
|
key->hash = pf_pkt_hash(key->af, key->proto,
|
|
&key->addr[0], &key->addr[1], 0, 0);
|
|
|
|
action = pf_find_state(pd, key, stp);
|
|
if (action != PF_MATCH)
|
|
return (action);
|
|
|
|
if ((*stp)->state_flags & PFSTATE_SLOPPY)
|
|
return (-1);
|
|
|
|
/* Is this ICMP message flowing in right direction? */
|
|
if ((*stp)->key[PF_SK_WIRE]->af != (*stp)->key[PF_SK_STACK]->af)
|
|
direction = (pd->af == (*stp)->key[PF_SK_WIRE]->af) ?
|
|
PF_IN : PF_OUT;
|
|
else
|
|
direction = (*stp)->direction;
|
|
if ((((!inner && direction == pd->dir) ||
|
|
(inner && direction != pd->dir)) ?
|
|
PF_IN : PF_OUT) != icmp_dir) {
|
|
if (pf_status.debug >= LOG_NOTICE) {
|
|
log(LOG_NOTICE,
|
|
"pf: icmp type %d in wrong direction (%d): ",
|
|
ntohs(type), icmp_dir);
|
|
pf_print_state(*stp);
|
|
addlog("\n");
|
|
}
|
|
return (PF_DROP);
|
|
}
|
|
return (-1);
|
|
}
|
|
|
|
int
|
|
pf_test_state_icmp(struct pf_pdesc *pd, struct pf_state **stp,
|
|
u_short *reason)
|
|
{
|
|
u_int16_t virtual_id, virtual_type;
|
|
u_int8_t icmptype, icmpcode;
|
|
int icmp_dir, iidx, ret, copyback = 0;
|
|
|
|
struct pf_state_key_cmp key;
|
|
|
|
switch (pd->proto) {
|
|
case IPPROTO_ICMP:
|
|
icmptype = pd->hdr.icmp.icmp_type;
|
|
icmpcode = pd->hdr.icmp.icmp_code;
|
|
break;
|
|
#ifdef INET6
|
|
case IPPROTO_ICMPV6:
|
|
icmptype = pd->hdr.icmp6.icmp6_type;
|
|
icmpcode = pd->hdr.icmp6.icmp6_code;
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
panic("unhandled proto %d", pd->proto);
|
|
}
|
|
|
|
if (pf_icmp_mapping(pd, icmptype, &icmp_dir, &virtual_id,
|
|
&virtual_type) == 0) {
|
|
/*
|
|
* ICMP query/reply message not related to a TCP/UDP packet.
|
|
* Search for an ICMP state.
|
|
*/
|
|
ret = pf_icmp_state_lookup(pd, &key, stp,
|
|
virtual_id, virtual_type, icmp_dir, &iidx,
|
|
0, 0);
|
|
/* IPv6? try matching a multicast address */
|
|
if (ret == PF_DROP && pd->af == AF_INET6 && icmp_dir == PF_OUT)
|
|
ret = pf_icmp_state_lookup(pd, &key, stp, virtual_id,
|
|
virtual_type, icmp_dir, &iidx, 1, 0);
|
|
if (ret >= 0)
|
|
return (ret);
|
|
|
|
(*stp)->expire = getuptime();
|
|
pf_update_state_timeout(*stp, PFTM_ICMP_ERROR_REPLY);
|
|
|
|
/* translate source/destination address, if necessary */
|
|
if ((*stp)->key[PF_SK_WIRE] != (*stp)->key[PF_SK_STACK]) {
|
|
struct pf_state_key *nk;
|
|
int afto, sidx, didx;
|
|
|
|
if (PF_REVERSED_KEY((*stp)->key, pd->af))
|
|
nk = (*stp)->key[pd->sidx];
|
|
else
|
|
nk = (*stp)->key[pd->didx];
|
|
|
|
afto = pd->af != nk->af;
|
|
sidx = afto ? pd->didx : pd->sidx;
|
|
didx = afto ? pd->sidx : pd->didx;
|
|
iidx = afto ? !iidx : iidx;
|
|
#ifdef INET6
|
|
if (afto) {
|
|
pf_addrcpy(&pd->nsaddr, &nk->addr[sidx],
|
|
nk->af);
|
|
pf_addrcpy(&pd->ndaddr, &nk->addr[didx],
|
|
nk->af);
|
|
pd->naf = nk->af;
|
|
}
|
|
#endif /* INET6 */
|
|
if (!afto) {
|
|
pf_translate_a(pd, pd->src, &nk->addr[sidx]);
|
|
pf_translate_a(pd, pd->dst, &nk->addr[didx]);
|
|
}
|
|
|
|
if (pd->rdomain != nk->rdomain)
|
|
pd->destchg = 1;
|
|
if (!afto && PF_ANEQ(pd->dst,
|
|
&nk->addr[didx], pd->af))
|
|
pd->destchg = 1;
|
|
pd->m->m_pkthdr.ph_rtableid = nk->rdomain;
|
|
|
|
switch (pd->af) {
|
|
case AF_INET:
|
|
#ifdef INET6
|
|
if (afto) {
|
|
if (pf_translate_icmp_af(pd, AF_INET6,
|
|
&pd->hdr.icmp))
|
|
return (PF_DROP);
|
|
pd->proto = IPPROTO_ICMPV6;
|
|
}
|
|
#endif /* INET6 */
|
|
pf_patch_16(pd,
|
|
&pd->hdr.icmp.icmp_id, nk->port[iidx]);
|
|
|
|
m_copyback(pd->m, pd->off, ICMP_MINLEN,
|
|
&pd->hdr.icmp, M_NOWAIT);
|
|
copyback = 1;
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (afto) {
|
|
if (pf_translate_icmp_af(pd, AF_INET,
|
|
&pd->hdr.icmp6))
|
|
return (PF_DROP);
|
|
pd->proto = IPPROTO_ICMP;
|
|
}
|
|
|
|
pf_patch_16(pd,
|
|
&pd->hdr.icmp6.icmp6_id, nk->port[iidx]);
|
|
|
|
m_copyback(pd->m, pd->off,
|
|
sizeof(struct icmp6_hdr), &pd->hdr.icmp6,
|
|
M_NOWAIT);
|
|
copyback = 1;
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
#ifdef INET6
|
|
if (afto)
|
|
return (PF_AFRT);
|
|
#endif /* INET6 */
|
|
}
|
|
} else {
|
|
/*
|
|
* ICMP error message in response to a TCP/UDP packet.
|
|
* Extract the inner TCP/UDP header and search for that state.
|
|
*/
|
|
struct pf_pdesc pd2;
|
|
struct ip h2;
|
|
#ifdef INET6
|
|
struct ip6_hdr h2_6;
|
|
#endif /* INET6 */
|
|
int ipoff2;
|
|
|
|
/* Initialize pd2 fields valid for both packets with pd. */
|
|
memset(&pd2, 0, sizeof(pd2));
|
|
pd2.af = pd->af;
|
|
pd2.dir = pd->dir;
|
|
pd2.kif = pd->kif;
|
|
pd2.m = pd->m;
|
|
pd2.rdomain = pd->rdomain;
|
|
/* Payload packet is from the opposite direction. */
|
|
pd2.sidx = (pd2.dir == PF_IN) ? 1 : 0;
|
|
pd2.didx = (pd2.dir == PF_IN) ? 0 : 1;
|
|
switch (pd->af) {
|
|
case AF_INET:
|
|
/* offset of h2 in mbuf chain */
|
|
ipoff2 = pd->off + ICMP_MINLEN;
|
|
|
|
if (!pf_pull_hdr(pd2.m, ipoff2, &h2, sizeof(h2),
|
|
reason, pd2.af)) {
|
|
DPFPRINTF(LOG_NOTICE,
|
|
"ICMP error message too short (ip)");
|
|
return (PF_DROP);
|
|
}
|
|
/*
|
|
* ICMP error messages don't refer to non-first
|
|
* fragments
|
|
*/
|
|
if (h2.ip_off & htons(IP_OFFMASK)) {
|
|
REASON_SET(reason, PFRES_FRAG);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
/* offset of protocol header that follows h2 */
|
|
pd2.off = ipoff2;
|
|
if (pf_walk_header(&pd2, &h2, reason) != PF_PASS)
|
|
return (PF_DROP);
|
|
|
|
pd2.tot_len = ntohs(h2.ip_len);
|
|
pd2.src = (struct pf_addr *)&h2.ip_src;
|
|
pd2.dst = (struct pf_addr *)&h2.ip_dst;
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
ipoff2 = pd->off + sizeof(struct icmp6_hdr);
|
|
|
|
if (!pf_pull_hdr(pd2.m, ipoff2, &h2_6, sizeof(h2_6),
|
|
reason, pd2.af)) {
|
|
DPFPRINTF(LOG_NOTICE,
|
|
"ICMP error message too short (ip6)");
|
|
return (PF_DROP);
|
|
}
|
|
|
|
pd2.off = ipoff2;
|
|
if (pf_walk_header6(&pd2, &h2_6, reason) != PF_PASS)
|
|
return (PF_DROP);
|
|
|
|
pd2.tot_len = ntohs(h2_6.ip6_plen) +
|
|
sizeof(struct ip6_hdr);
|
|
pd2.src = (struct pf_addr *)&h2_6.ip6_src;
|
|
pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
unhandled_af(pd->af);
|
|
}
|
|
|
|
if (PF_ANEQ(pd->dst, pd2.src, pd->af)) {
|
|
if (pf_status.debug >= LOG_NOTICE) {
|
|
log(LOG_NOTICE,
|
|
"pf: BAD ICMP %d:%d outer dst: ",
|
|
icmptype, icmpcode);
|
|
pf_print_host(pd->src, 0, pd->af);
|
|
addlog(" -> ");
|
|
pf_print_host(pd->dst, 0, pd->af);
|
|
addlog(" inner src: ");
|
|
pf_print_host(pd2.src, 0, pd2.af);
|
|
addlog(" -> ");
|
|
pf_print_host(pd2.dst, 0, pd2.af);
|
|
addlog("\n");
|
|
}
|
|
REASON_SET(reason, PFRES_BADSTATE);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
switch (pd2.proto) {
|
|
case IPPROTO_TCP: {
|
|
struct tcphdr *th = &pd2.hdr.tcp;
|
|
u_int32_t seq;
|
|
struct pf_state_peer *src, *dst;
|
|
u_int8_t dws;
|
|
int action;
|
|
|
|
/*
|
|
* Only the first 8 bytes of the TCP header can be
|
|
* expected. Don't access any TCP header fields after
|
|
* th_seq, an ackskew test is not possible.
|
|
*/
|
|
if (!pf_pull_hdr(pd2.m, pd2.off, th, 8, reason,
|
|
pd2.af)) {
|
|
DPFPRINTF(LOG_NOTICE,
|
|
"ICMP error message too short (tcp)");
|
|
return (PF_DROP);
|
|
}
|
|
|
|
key.af = pd2.af;
|
|
key.proto = IPPROTO_TCP;
|
|
key.rdomain = pd2.rdomain;
|
|
pf_addrcpy(&key.addr[pd2.sidx], pd2.src, key.af);
|
|
pf_addrcpy(&key.addr[pd2.didx], pd2.dst, key.af);
|
|
key.port[pd2.sidx] = th->th_sport;
|
|
key.port[pd2.didx] = th->th_dport;
|
|
key.hash = pf_pkt_hash(pd2.af, pd2.proto,
|
|
pd2.src, pd2.dst, th->th_sport, th->th_dport);
|
|
|
|
action = pf_find_state(&pd2, &key, stp);
|
|
if (action != PF_MATCH)
|
|
return (action);
|
|
|
|
if (pd2.dir == (*stp)->direction) {
|
|
if (PF_REVERSED_KEY((*stp)->key, pd->af)) {
|
|
src = &(*stp)->src;
|
|
dst = &(*stp)->dst;
|
|
} else {
|
|
src = &(*stp)->dst;
|
|
dst = &(*stp)->src;
|
|
}
|
|
} else {
|
|
if (PF_REVERSED_KEY((*stp)->key, pd->af)) {
|
|
src = &(*stp)->dst;
|
|
dst = &(*stp)->src;
|
|
} else {
|
|
src = &(*stp)->src;
|
|
dst = &(*stp)->dst;
|
|
}
|
|
}
|
|
|
|
if (src->wscale && dst->wscale)
|
|
dws = dst->wscale & PF_WSCALE_MASK;
|
|
else
|
|
dws = 0;
|
|
|
|
/* Demodulate sequence number */
|
|
seq = ntohl(th->th_seq) - src->seqdiff;
|
|
if (src->seqdiff) {
|
|
pf_patch_32(pd, &th->th_seq, htonl(seq));
|
|
copyback = 1;
|
|
}
|
|
|
|
if (!((*stp)->state_flags & PFSTATE_SLOPPY) &&
|
|
(!SEQ_GEQ(src->seqhi, seq) || !SEQ_GEQ(seq,
|
|
src->seqlo - (dst->max_win << dws)))) {
|
|
if (pf_status.debug >= LOG_NOTICE) {
|
|
log(LOG_NOTICE,
|
|
"pf: BAD ICMP %d:%d ",
|
|
icmptype, icmpcode);
|
|
pf_print_host(pd->src, 0, pd->af);
|
|
addlog(" -> ");
|
|
pf_print_host(pd->dst, 0, pd->af);
|
|
addlog(" state: ");
|
|
pf_print_state(*stp);
|
|
addlog(" seq=%u\n", seq);
|
|
}
|
|
REASON_SET(reason, PFRES_BADSTATE);
|
|
return (PF_DROP);
|
|
} else {
|
|
if (pf_status.debug >= LOG_DEBUG) {
|
|
log(LOG_DEBUG,
|
|
"pf: OK ICMP %d:%d ",
|
|
icmptype, icmpcode);
|
|
pf_print_host(pd->src, 0, pd->af);
|
|
addlog(" -> ");
|
|
pf_print_host(pd->dst, 0, pd->af);
|
|
addlog(" state: ");
|
|
pf_print_state(*stp);
|
|
addlog(" seq=%u\n", seq);
|
|
}
|
|
}
|
|
|
|
/* translate source/destination address, if necessary */
|
|
if ((*stp)->key[PF_SK_WIRE] !=
|
|
(*stp)->key[PF_SK_STACK]) {
|
|
struct pf_state_key *nk;
|
|
int afto, sidx, didx;
|
|
|
|
if (PF_REVERSED_KEY((*stp)->key, pd->af))
|
|
nk = (*stp)->key[pd->sidx];
|
|
else
|
|
nk = (*stp)->key[pd->didx];
|
|
|
|
afto = pd->af != nk->af;
|
|
sidx = afto ? pd2.didx : pd2.sidx;
|
|
didx = afto ? pd2.sidx : pd2.didx;
|
|
|
|
#ifdef INET6
|
|
if (afto) {
|
|
if (pf_translate_icmp_af(pd, nk->af,
|
|
&pd->hdr.icmp))
|
|
return (PF_DROP);
|
|
m_copyback(pd->m, pd->off,
|
|
sizeof(struct icmp6_hdr),
|
|
&pd->hdr.icmp6, M_NOWAIT);
|
|
if (pf_change_icmp_af(pd->m, ipoff2,
|
|
pd, &pd2, &nk->addr[sidx],
|
|
&nk->addr[didx], pd->af, nk->af))
|
|
return (PF_DROP);
|
|
if (nk->af == AF_INET)
|
|
pd->proto = IPPROTO_ICMP;
|
|
else
|
|
pd->proto = IPPROTO_ICMPV6;
|
|
pd->m->m_pkthdr.ph_rtableid =
|
|
nk->rdomain;
|
|
pd->destchg = 1;
|
|
pf_addrcpy(&pd->nsaddr,
|
|
&nk->addr[pd2.sidx], nk->af);
|
|
pf_addrcpy(&pd->ndaddr,
|
|
&nk->addr[pd2.didx], nk->af);
|
|
pd->naf = nk->af;
|
|
|
|
pf_patch_16(pd,
|
|
&th->th_sport, nk->port[sidx]);
|
|
pf_patch_16(pd,
|
|
&th->th_dport, nk->port[didx]);
|
|
|
|
m_copyback(pd2.m, pd2.off, 8, th,
|
|
M_NOWAIT);
|
|
return (PF_AFRT);
|
|
}
|
|
#endif /* INET6 */
|
|
if (PF_ANEQ(pd2.src,
|
|
&nk->addr[pd2.sidx], pd2.af) ||
|
|
nk->port[pd2.sidx] != th->th_sport)
|
|
pf_translate_icmp(pd, pd2.src,
|
|
&th->th_sport, pd->dst,
|
|
&nk->addr[pd2.sidx],
|
|
nk->port[pd2.sidx]);
|
|
|
|
if (PF_ANEQ(pd2.dst, &nk->addr[pd2.didx],
|
|
pd2.af) || pd2.rdomain != nk->rdomain)
|
|
pd->destchg = 1;
|
|
pd->m->m_pkthdr.ph_rtableid = nk->rdomain;
|
|
|
|
if (PF_ANEQ(pd2.dst,
|
|
&nk->addr[pd2.didx], pd2.af) ||
|
|
nk->port[pd2.didx] != th->th_dport)
|
|
pf_translate_icmp(pd, pd2.dst,
|
|
&th->th_dport, pd->src,
|
|
&nk->addr[pd2.didx],
|
|
nk->port[pd2.didx]);
|
|
copyback = 1;
|
|
}
|
|
|
|
if (copyback) {
|
|
switch (pd2.af) {
|
|
case AF_INET:
|
|
m_copyback(pd->m, pd->off, ICMP_MINLEN,
|
|
&pd->hdr.icmp, M_NOWAIT);
|
|
m_copyback(pd2.m, ipoff2, sizeof(h2),
|
|
&h2, M_NOWAIT);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
m_copyback(pd->m, pd->off,
|
|
sizeof(struct icmp6_hdr),
|
|
&pd->hdr.icmp6, M_NOWAIT);
|
|
m_copyback(pd2.m, ipoff2, sizeof(h2_6),
|
|
&h2_6, M_NOWAIT);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
m_copyback(pd2.m, pd2.off, 8, th, M_NOWAIT);
|
|
}
|
|
break;
|
|
}
|
|
case IPPROTO_UDP: {
|
|
struct udphdr *uh = &pd2.hdr.udp;
|
|
int action;
|
|
|
|
if (!pf_pull_hdr(pd2.m, pd2.off, uh, sizeof(*uh),
|
|
reason, pd2.af)) {
|
|
DPFPRINTF(LOG_NOTICE,
|
|
"ICMP error message too short (udp)");
|
|
return (PF_DROP);
|
|
}
|
|
|
|
key.af = pd2.af;
|
|
key.proto = IPPROTO_UDP;
|
|
key.rdomain = pd2.rdomain;
|
|
pf_addrcpy(&key.addr[pd2.sidx], pd2.src, key.af);
|
|
pf_addrcpy(&key.addr[pd2.didx], pd2.dst, key.af);
|
|
key.port[pd2.sidx] = uh->uh_sport;
|
|
key.port[pd2.didx] = uh->uh_dport;
|
|
key.hash = pf_pkt_hash(pd2.af, pd2.proto,
|
|
pd2.src, pd2.dst, uh->uh_sport, uh->uh_dport);
|
|
|
|
action = pf_find_state(&pd2, &key, stp);
|
|
if (action != PF_MATCH)
|
|
return (action);
|
|
|
|
/* translate source/destination address, if necessary */
|
|
if ((*stp)->key[PF_SK_WIRE] !=
|
|
(*stp)->key[PF_SK_STACK]) {
|
|
struct pf_state_key *nk;
|
|
int afto, sidx, didx;
|
|
|
|
if (PF_REVERSED_KEY((*stp)->key, pd->af))
|
|
nk = (*stp)->key[pd->sidx];
|
|
else
|
|
nk = (*stp)->key[pd->didx];
|
|
|
|
afto = pd->af != nk->af;
|
|
sidx = afto ? pd2.didx : pd2.sidx;
|
|
didx = afto ? pd2.sidx : pd2.didx;
|
|
|
|
#ifdef INET6
|
|
if (afto) {
|
|
if (pf_translate_icmp_af(pd, nk->af,
|
|
&pd->hdr.icmp))
|
|
return (PF_DROP);
|
|
m_copyback(pd->m, pd->off,
|
|
sizeof(struct icmp6_hdr),
|
|
&pd->hdr.icmp6, M_NOWAIT);
|
|
if (pf_change_icmp_af(pd->m, ipoff2,
|
|
pd, &pd2, &nk->addr[sidx],
|
|
&nk->addr[didx], pd->af, nk->af))
|
|
return (PF_DROP);
|
|
if (nk->af == AF_INET)
|
|
pd->proto = IPPROTO_ICMP;
|
|
else
|
|
pd->proto = IPPROTO_ICMPV6;
|
|
pd->m->m_pkthdr.ph_rtableid =
|
|
nk->rdomain;
|
|
pd->destchg = 1;
|
|
pf_addrcpy(&pd->nsaddr,
|
|
&nk->addr[pd2.sidx], nk->af);
|
|
pf_addrcpy(&pd->ndaddr,
|
|
&nk->addr[pd2.didx], nk->af);
|
|
pd->naf = nk->af;
|
|
|
|
pf_patch_16(pd,
|
|
&uh->uh_sport, nk->port[sidx]);
|
|
pf_patch_16(pd,
|
|
&uh->uh_dport, nk->port[didx]);
|
|
|
|
m_copyback(pd2.m, pd2.off, sizeof(*uh),
|
|
uh, M_NOWAIT);
|
|
return (PF_AFRT);
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
if (PF_ANEQ(pd2.src,
|
|
&nk->addr[pd2.sidx], pd2.af) ||
|
|
nk->port[pd2.sidx] != uh->uh_sport)
|
|
pf_translate_icmp(pd, pd2.src,
|
|
&uh->uh_sport, pd->dst,
|
|
&nk->addr[pd2.sidx],
|
|
nk->port[pd2.sidx]);
|
|
|
|
if (PF_ANEQ(pd2.dst, &nk->addr[pd2.didx],
|
|
pd2.af) || pd2.rdomain != nk->rdomain)
|
|
pd->destchg = 1;
|
|
pd->m->m_pkthdr.ph_rtableid = nk->rdomain;
|
|
|
|
if (PF_ANEQ(pd2.dst,
|
|
&nk->addr[pd2.didx], pd2.af) ||
|
|
nk->port[pd2.didx] != uh->uh_dport)
|
|
pf_translate_icmp(pd, pd2.dst,
|
|
&uh->uh_dport, pd->src,
|
|
&nk->addr[pd2.didx],
|
|
nk->port[pd2.didx]);
|
|
|
|
switch (pd2.af) {
|
|
case AF_INET:
|
|
m_copyback(pd->m, pd->off, ICMP_MINLEN,
|
|
&pd->hdr.icmp, M_NOWAIT);
|
|
m_copyback(pd2.m, ipoff2, sizeof(h2),
|
|
&h2, M_NOWAIT);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
m_copyback(pd->m, pd->off,
|
|
sizeof(struct icmp6_hdr),
|
|
&pd->hdr.icmp6, M_NOWAIT);
|
|
m_copyback(pd2.m, ipoff2, sizeof(h2_6),
|
|
&h2_6, M_NOWAIT);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
/* Avoid recomputing quoted UDP checksum.
|
|
* note: udp6 0 csum invalid per rfc2460 p27.
|
|
* but presumed nothing cares in this context */
|
|
pf_patch_16(pd, &uh->uh_sum, 0);
|
|
m_copyback(pd2.m, pd2.off, sizeof(*uh), uh,
|
|
M_NOWAIT);
|
|
copyback = 1;
|
|
}
|
|
break;
|
|
}
|
|
case IPPROTO_ICMP: {
|
|
struct icmp *iih = &pd2.hdr.icmp;
|
|
|
|
if (pd2.af != AF_INET) {
|
|
REASON_SET(reason, PFRES_NORM);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
if (!pf_pull_hdr(pd2.m, pd2.off, iih, ICMP_MINLEN,
|
|
reason, pd2.af)) {
|
|
DPFPRINTF(LOG_NOTICE,
|
|
"ICMP error message too short (icmp)");
|
|
return (PF_DROP);
|
|
}
|
|
|
|
pf_icmp_mapping(&pd2, iih->icmp_type,
|
|
&icmp_dir, &virtual_id, &virtual_type);
|
|
|
|
ret = pf_icmp_state_lookup(&pd2, &key, stp,
|
|
virtual_id, virtual_type, icmp_dir, &iidx, 0, 1);
|
|
if (ret >= 0)
|
|
return (ret);
|
|
|
|
/* translate source/destination address, if necessary */
|
|
if ((*stp)->key[PF_SK_WIRE] !=
|
|
(*stp)->key[PF_SK_STACK]) {
|
|
struct pf_state_key *nk;
|
|
int afto, sidx, didx;
|
|
|
|
if (PF_REVERSED_KEY((*stp)->key, pd->af))
|
|
nk = (*stp)->key[pd->sidx];
|
|
else
|
|
nk = (*stp)->key[pd->didx];
|
|
|
|
afto = pd->af != nk->af;
|
|
sidx = afto ? pd2.didx : pd2.sidx;
|
|
didx = afto ? pd2.sidx : pd2.didx;
|
|
iidx = afto ? !iidx : iidx;
|
|
|
|
#ifdef INET6
|
|
if (afto) {
|
|
if (nk->af != AF_INET6)
|
|
return (PF_DROP);
|
|
if (pf_translate_icmp_af(pd, nk->af,
|
|
&pd->hdr.icmp))
|
|
return (PF_DROP);
|
|
m_copyback(pd->m, pd->off,
|
|
sizeof(struct icmp6_hdr),
|
|
&pd->hdr.icmp6, M_NOWAIT);
|
|
if (pf_change_icmp_af(pd->m, ipoff2,
|
|
pd, &pd2, &nk->addr[sidx],
|
|
&nk->addr[didx], pd->af, nk->af))
|
|
return (PF_DROP);
|
|
pd->proto = IPPROTO_ICMPV6;
|
|
if (pf_translate_icmp_af(pd,
|
|
nk->af, iih))
|
|
return (PF_DROP);
|
|
if (virtual_type == htons(ICMP_ECHO))
|
|
pf_patch_16(pd, &iih->icmp_id,
|
|
nk->port[iidx]);
|
|
m_copyback(pd2.m, pd2.off, ICMP_MINLEN,
|
|
iih, M_NOWAIT);
|
|
pd->m->m_pkthdr.ph_rtableid =
|
|
nk->rdomain;
|
|
pd->destchg = 1;
|
|
pf_addrcpy(&pd->nsaddr,
|
|
&nk->addr[pd2.sidx], nk->af);
|
|
pf_addrcpy(&pd->ndaddr,
|
|
&nk->addr[pd2.didx], nk->af);
|
|
pd->naf = nk->af;
|
|
return (PF_AFRT);
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
if (PF_ANEQ(pd2.src,
|
|
&nk->addr[pd2.sidx], pd2.af) ||
|
|
(virtual_type == htons(ICMP_ECHO) &&
|
|
nk->port[iidx] != iih->icmp_id))
|
|
pf_translate_icmp(pd, pd2.src,
|
|
(virtual_type == htons(ICMP_ECHO)) ?
|
|
&iih->icmp_id : NULL,
|
|
pd->dst, &nk->addr[pd2.sidx],
|
|
(virtual_type == htons(ICMP_ECHO)) ?
|
|
nk->port[iidx] : 0);
|
|
|
|
if (PF_ANEQ(pd2.dst, &nk->addr[pd2.didx],
|
|
pd2.af) || pd2.rdomain != nk->rdomain)
|
|
pd->destchg = 1;
|
|
pd->m->m_pkthdr.ph_rtableid = nk->rdomain;
|
|
|
|
if (PF_ANEQ(pd2.dst,
|
|
&nk->addr[pd2.didx], pd2.af))
|
|
pf_translate_icmp(pd, pd2.dst, NULL,
|
|
pd->src, &nk->addr[pd2.didx], 0);
|
|
|
|
m_copyback(pd->m, pd->off, ICMP_MINLEN,
|
|
&pd->hdr.icmp, M_NOWAIT);
|
|
m_copyback(pd2.m, ipoff2, sizeof(h2), &h2,
|
|
M_NOWAIT);
|
|
m_copyback(pd2.m, pd2.off, ICMP_MINLEN, iih,
|
|
M_NOWAIT);
|
|
copyback = 1;
|
|
}
|
|
break;
|
|
}
|
|
#ifdef INET6
|
|
case IPPROTO_ICMPV6: {
|
|
struct icmp6_hdr *iih = &pd2.hdr.icmp6;
|
|
|
|
if (pd2.af != AF_INET6) {
|
|
REASON_SET(reason, PFRES_NORM);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
if (!pf_pull_hdr(pd2.m, pd2.off, iih,
|
|
sizeof(struct icmp6_hdr), reason, pd2.af)) {
|
|
DPFPRINTF(LOG_NOTICE,
|
|
"ICMP error message too short (icmp6)");
|
|
return (PF_DROP);
|
|
}
|
|
|
|
pf_icmp_mapping(&pd2, iih->icmp6_type,
|
|
&icmp_dir, &virtual_id, &virtual_type);
|
|
ret = pf_icmp_state_lookup(&pd2, &key, stp,
|
|
virtual_id, virtual_type, icmp_dir, &iidx, 0, 1);
|
|
/* IPv6? try matching a multicast address */
|
|
if (ret == PF_DROP && pd2.af == AF_INET6 &&
|
|
icmp_dir == PF_OUT)
|
|
ret = pf_icmp_state_lookup(&pd2, &key, stp,
|
|
virtual_id, virtual_type, icmp_dir, &iidx,
|
|
1, 1);
|
|
if (ret >= 0)
|
|
return (ret);
|
|
|
|
/* translate source/destination address, if necessary */
|
|
if ((*stp)->key[PF_SK_WIRE] !=
|
|
(*stp)->key[PF_SK_STACK]) {
|
|
struct pf_state_key *nk;
|
|
int afto, sidx, didx;
|
|
|
|
if (PF_REVERSED_KEY((*stp)->key, pd->af))
|
|
nk = (*stp)->key[pd->sidx];
|
|
else
|
|
nk = (*stp)->key[pd->didx];
|
|
|
|
afto = pd->af != nk->af;
|
|
sidx = afto ? pd2.didx : pd2.sidx;
|
|
didx = afto ? pd2.sidx : pd2.didx;
|
|
iidx = afto ? !iidx : iidx;
|
|
|
|
if (afto) {
|
|
if (nk->af != AF_INET)
|
|
return (PF_DROP);
|
|
if (pf_translate_icmp_af(pd, nk->af,
|
|
&pd->hdr.icmp))
|
|
return (PF_DROP);
|
|
m_copyback(pd->m, pd->off,
|
|
sizeof(struct icmp6_hdr),
|
|
&pd->hdr.icmp6, M_NOWAIT);
|
|
if (pf_change_icmp_af(pd->m, ipoff2,
|
|
pd, &pd2, &nk->addr[sidx],
|
|
&nk->addr[didx], pd->af, nk->af))
|
|
return (PF_DROP);
|
|
pd->proto = IPPROTO_ICMP;
|
|
if (pf_translate_icmp_af(pd,
|
|
nk->af, iih))
|
|
return (PF_DROP);
|
|
if (virtual_type ==
|
|
htons(ICMP6_ECHO_REQUEST))
|
|
pf_patch_16(pd, &iih->icmp6_id,
|
|
nk->port[iidx]);
|
|
m_copyback(pd2.m, pd2.off,
|
|
sizeof(struct icmp6_hdr), iih,
|
|
M_NOWAIT);
|
|
pd->m->m_pkthdr.ph_rtableid =
|
|
nk->rdomain;
|
|
pd->destchg = 1;
|
|
pf_addrcpy(&pd->nsaddr,
|
|
&nk->addr[pd2.sidx], nk->af);
|
|
pf_addrcpy(&pd->ndaddr,
|
|
&nk->addr[pd2.didx], nk->af);
|
|
pd->naf = nk->af;
|
|
return (PF_AFRT);
|
|
}
|
|
|
|
if (PF_ANEQ(pd2.src,
|
|
&nk->addr[pd2.sidx], pd2.af) ||
|
|
((virtual_type ==
|
|
htons(ICMP6_ECHO_REQUEST)) &&
|
|
nk->port[pd2.sidx] != iih->icmp6_id))
|
|
pf_translate_icmp(pd, pd2.src,
|
|
(virtual_type ==
|
|
htons(ICMP6_ECHO_REQUEST))
|
|
? &iih->icmp6_id : NULL,
|
|
pd->dst, &nk->addr[pd2.sidx],
|
|
(virtual_type ==
|
|
htons(ICMP6_ECHO_REQUEST))
|
|
? nk->port[iidx] : 0);
|
|
|
|
if (PF_ANEQ(pd2.dst, &nk->addr[pd2.didx],
|
|
pd2.af) || pd2.rdomain != nk->rdomain)
|
|
pd->destchg = 1;
|
|
pd->m->m_pkthdr.ph_rtableid = nk->rdomain;
|
|
|
|
if (PF_ANEQ(pd2.dst,
|
|
&nk->addr[pd2.didx], pd2.af))
|
|
pf_translate_icmp(pd, pd2.dst, NULL,
|
|
pd->src, &nk->addr[pd2.didx], 0);
|
|
|
|
m_copyback(pd->m, pd->off,
|
|
sizeof(struct icmp6_hdr), &pd->hdr.icmp6,
|
|
M_NOWAIT);
|
|
m_copyback(pd2.m, ipoff2, sizeof(h2_6), &h2_6,
|
|
M_NOWAIT);
|
|
m_copyback(pd2.m, pd2.off,
|
|
sizeof(struct icmp6_hdr), iih, M_NOWAIT);
|
|
copyback = 1;
|
|
}
|
|
break;
|
|
}
|
|
#endif /* INET6 */
|
|
default: {
|
|
int action;
|
|
|
|
key.af = pd2.af;
|
|
key.proto = pd2.proto;
|
|
key.rdomain = pd2.rdomain;
|
|
pf_addrcpy(&key.addr[pd2.sidx], pd2.src, key.af);
|
|
pf_addrcpy(&key.addr[pd2.didx], pd2.dst, key.af);
|
|
key.port[0] = key.port[1] = 0;
|
|
key.hash = pf_pkt_hash(pd2.af, pd2.proto,
|
|
pd2.src, pd2.dst, 0, 0);
|
|
|
|
action = pf_find_state(&pd2, &key, stp);
|
|
if (action != PF_MATCH)
|
|
return (action);
|
|
|
|
/* translate source/destination address, if necessary */
|
|
if ((*stp)->key[PF_SK_WIRE] !=
|
|
(*stp)->key[PF_SK_STACK]) {
|
|
struct pf_state_key *nk =
|
|
(*stp)->key[pd->didx];
|
|
|
|
if (PF_ANEQ(pd2.src,
|
|
&nk->addr[pd2.sidx], pd2.af))
|
|
pf_translate_icmp(pd, pd2.src, NULL,
|
|
pd->dst, &nk->addr[pd2.sidx], 0);
|
|
|
|
if (PF_ANEQ(pd2.dst, &nk->addr[pd2.didx],
|
|
pd2.af) || pd2.rdomain != nk->rdomain)
|
|
pd->destchg = 1;
|
|
pd->m->m_pkthdr.ph_rtableid = nk->rdomain;
|
|
|
|
if (PF_ANEQ(pd2.dst,
|
|
&nk->addr[pd2.didx], pd2.af))
|
|
pf_translate_icmp(pd, pd2.dst, NULL,
|
|
pd->src, &nk->addr[pd2.didx], 0);
|
|
|
|
switch (pd2.af) {
|
|
case AF_INET:
|
|
m_copyback(pd->m, pd->off, ICMP_MINLEN,
|
|
&pd->hdr.icmp, M_NOWAIT);
|
|
m_copyback(pd2.m, ipoff2, sizeof(h2),
|
|
&h2, M_NOWAIT);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
m_copyback(pd->m, pd->off,
|
|
sizeof(struct icmp6_hdr),
|
|
&pd->hdr.icmp6, M_NOWAIT);
|
|
m_copyback(pd2.m, ipoff2, sizeof(h2_6),
|
|
&h2_6, M_NOWAIT);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
copyback = 1;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (copyback) {
|
|
m_copyback(pd->m, pd->off, pd->hdrlen, &pd->hdr, M_NOWAIT);
|
|
}
|
|
|
|
return (PF_PASS);
|
|
}
|
|
|
|
/*
|
|
* ipoff and off are measured from the start of the mbuf chain.
|
|
* h must be at "ipoff" on the mbuf chain.
|
|
*/
|
|
void *
|
|
pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
|
|
u_short *reasonp, sa_family_t af)
|
|
{
|
|
int iplen = 0;
|
|
|
|
switch (af) {
|
|
case AF_INET: {
|
|
struct ip *h = mtod(m, struct ip *);
|
|
u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3;
|
|
|
|
if (fragoff) {
|
|
REASON_SET(reasonp, PFRES_FRAG);
|
|
return (NULL);
|
|
}
|
|
iplen = ntohs(h->ip_len);
|
|
break;
|
|
}
|
|
#ifdef INET6
|
|
case AF_INET6: {
|
|
struct ip6_hdr *h = mtod(m, struct ip6_hdr *);
|
|
|
|
iplen = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
|
|
break;
|
|
}
|
|
#endif /* INET6 */
|
|
}
|
|
if (m->m_pkthdr.len < off + len || iplen < off + len) {
|
|
REASON_SET(reasonp, PFRES_SHORT);
|
|
return (NULL);
|
|
}
|
|
m_copydata(m, off, len, p);
|
|
return (p);
|
|
}
|
|
|
|
int
|
|
pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
|
|
int rtableid)
|
|
{
|
|
struct sockaddr_storage ss;
|
|
struct sockaddr_in *dst;
|
|
int ret = 1;
|
|
int check_mpath;
|
|
#ifdef INET6
|
|
struct sockaddr_in6 *dst6;
|
|
#endif /* INET6 */
|
|
struct rtentry *rt = NULL;
|
|
|
|
check_mpath = 0;
|
|
memset(&ss, 0, sizeof(ss));
|
|
switch (af) {
|
|
case AF_INET:
|
|
dst = (struct sockaddr_in *)&ss;
|
|
dst->sin_family = AF_INET;
|
|
dst->sin_len = sizeof(*dst);
|
|
dst->sin_addr = addr->v4;
|
|
if (ipmultipath)
|
|
check_mpath = 1;
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
/*
|
|
* Skip check for addresses with embedded interface scope,
|
|
* as they would always match anyway.
|
|
*/
|
|
if (IN6_IS_SCOPE_EMBED(&addr->v6))
|
|
goto out;
|
|
dst6 = (struct sockaddr_in6 *)&ss;
|
|
dst6->sin6_family = AF_INET6;
|
|
dst6->sin6_len = sizeof(*dst6);
|
|
dst6->sin6_addr = addr->v6;
|
|
if (ip6_multipath)
|
|
check_mpath = 1;
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
|
|
/* Skip checks for ipsec interfaces */
|
|
if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
|
|
goto out;
|
|
|
|
rt = rtalloc(sstosa(&ss), 0, rtableid);
|
|
if (rt != NULL) {
|
|
/* No interface given, this is a no-route check */
|
|
if (kif == NULL)
|
|
goto out;
|
|
|
|
if (kif->pfik_ifp == NULL) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
/* Perform uRPF check if passed input interface */
|
|
ret = 0;
|
|
do {
|
|
if (rt->rt_ifidx == kif->pfik_ifp->if_index) {
|
|
ret = 1;
|
|
#if NCARP > 0
|
|
} else {
|
|
struct ifnet *ifp;
|
|
|
|
ifp = if_get(rt->rt_ifidx);
|
|
if (ifp != NULL && ifp->if_type == IFT_CARP &&
|
|
ifp->if_carpdevidx ==
|
|
kif->pfik_ifp->if_index)
|
|
ret = 1;
|
|
if_put(ifp);
|
|
#endif /* NCARP */
|
|
}
|
|
|
|
rt = rtable_iterate(rt);
|
|
} while (check_mpath == 1 && rt != NULL && ret == 0);
|
|
} else
|
|
ret = 0;
|
|
out:
|
|
rtfree(rt);
|
|
return (ret);
|
|
}
|
|
|
|
int
|
|
pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw,
|
|
int rtableid)
|
|
{
|
|
struct sockaddr_storage ss;
|
|
struct sockaddr_in *dst;
|
|
#ifdef INET6
|
|
struct sockaddr_in6 *dst6;
|
|
#endif /* INET6 */
|
|
struct rtentry *rt;
|
|
int ret = 0;
|
|
|
|
memset(&ss, 0, sizeof(ss));
|
|
switch (af) {
|
|
case AF_INET:
|
|
dst = (struct sockaddr_in *)&ss;
|
|
dst->sin_family = AF_INET;
|
|
dst->sin_len = sizeof(*dst);
|
|
dst->sin_addr = addr->v4;
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
dst6 = (struct sockaddr_in6 *)&ss;
|
|
dst6->sin6_family = AF_INET6;
|
|
dst6->sin6_len = sizeof(*dst6);
|
|
dst6->sin6_addr = addr->v6;
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
|
|
rt = rtalloc(sstosa(&ss), RT_RESOLVE, rtableid);
|
|
if (rt != NULL) {
|
|
if (rt->rt_labelid == aw->v.rtlabel)
|
|
ret = 1;
|
|
rtfree(rt);
|
|
}
|
|
|
|
return (ret);
|
|
}
|
|
|
|
/* pf_route() may change pd->m, adjust local copies after calling */
|
|
void
|
|
pf_route(struct pf_pdesc *pd, struct pf_state *st)
|
|
{
|
|
struct mbuf *m0;
|
|
struct mbuf_list ml;
|
|
struct sockaddr_in *dst, sin;
|
|
struct rtentry *rt = NULL;
|
|
struct ip *ip;
|
|
struct ifnet *ifp = NULL;
|
|
unsigned int rtableid;
|
|
|
|
if (pd->m->m_pkthdr.pf.routed++ > 3) {
|
|
m_freem(pd->m);
|
|
pd->m = NULL;
|
|
return;
|
|
}
|
|
|
|
if (st->rt == PF_DUPTO) {
|
|
if ((m0 = m_dup_pkt(pd->m, max_linkhdr, M_NOWAIT)) == NULL)
|
|
return;
|
|
} else {
|
|
if ((st->rt == PF_REPLYTO) == (st->direction == pd->dir))
|
|
return;
|
|
m0 = pd->m;
|
|
pd->m = NULL;
|
|
}
|
|
|
|
if (m0->m_len < sizeof(struct ip)) {
|
|
DPFPRINTF(LOG_ERR,
|
|
"%s: m0->m_len < sizeof(struct ip)", __func__);
|
|
goto bad;
|
|
}
|
|
|
|
ip = mtod(m0, struct ip *);
|
|
|
|
if (pd->dir == PF_IN) {
|
|
if (ip->ip_ttl <= IPTTLDEC) {
|
|
if (st->rt != PF_DUPTO) {
|
|
pf_send_icmp(m0, ICMP_TIMXCEED,
|
|
ICMP_TIMXCEED_INTRANS, 0,
|
|
pd->af, st->rule.ptr, pd->rdomain);
|
|
}
|
|
goto bad;
|
|
}
|
|
ip->ip_ttl -= IPTTLDEC;
|
|
}
|
|
|
|
memset(&sin, 0, sizeof(sin));
|
|
dst = &sin;
|
|
dst->sin_family = AF_INET;
|
|
dst->sin_len = sizeof(*dst);
|
|
dst->sin_addr = st->rt_addr.v4;
|
|
rtableid = m0->m_pkthdr.ph_rtableid;
|
|
|
|
rt = rtalloc_mpath(sintosa(dst), &ip->ip_src.s_addr, rtableid);
|
|
if (!rtisvalid(rt)) {
|
|
if (st->rt != PF_DUPTO) {
|
|
pf_send_icmp(m0, ICMP_UNREACH, ICMP_UNREACH_HOST,
|
|
0, pd->af, st->rule.ptr, pd->rdomain);
|
|
}
|
|
ipstat_inc(ips_noroute);
|
|
goto bad;
|
|
}
|
|
|
|
ifp = if_get(rt->rt_ifidx);
|
|
if (ifp == NULL)
|
|
goto bad;
|
|
|
|
/* A locally generated packet may have invalid source address. */
|
|
if ((ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET &&
|
|
(ifp->if_flags & IFF_LOOPBACK) == 0)
|
|
ip->ip_src = ifatoia(rt->rt_ifa)->ia_addr.sin_addr;
|
|
|
|
if (st->rt != PF_DUPTO && pd->dir == PF_IN) {
|
|
if (pf_test(AF_INET, PF_OUT, ifp, &m0) != PF_PASS)
|
|
goto bad;
|
|
else if (m0 == NULL)
|
|
goto done;
|
|
if (m0->m_len < sizeof(struct ip)) {
|
|
DPFPRINTF(LOG_ERR,
|
|
"%s: m0->m_len < sizeof(struct ip)", __func__);
|
|
goto bad;
|
|
}
|
|
ip = mtod(m0, struct ip *);
|
|
}
|
|
|
|
if (if_output_tso(ifp, &m0, sintosa(dst), rt, ifp->if_mtu) ||
|
|
m0 == NULL)
|
|
goto done;
|
|
|
|
/*
|
|
* Too large for interface; fragment if possible.
|
|
* Must be able to put at least 8 bytes per fragment.
|
|
*/
|
|
if (ip->ip_off & htons(IP_DF)) {
|
|
ipstat_inc(ips_cantfrag);
|
|
if (st->rt != PF_DUPTO)
|
|
pf_send_icmp(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG,
|
|
ifp->if_mtu, pd->af, st->rule.ptr, pd->rdomain);
|
|
goto bad;
|
|
}
|
|
|
|
if (ip_fragment(m0, &ml, ifp, ifp->if_mtu) ||
|
|
if_output_ml(ifp, &ml, sintosa(dst), rt))
|
|
goto done;
|
|
ipstat_inc(ips_fragmented);
|
|
|
|
done:
|
|
if_put(ifp);
|
|
rtfree(rt);
|
|
return;
|
|
|
|
bad:
|
|
m_freem(m0);
|
|
goto done;
|
|
}
|
|
|
|
#ifdef INET6
|
|
/* pf_route6() may change pd->m, adjust local copies after calling */
|
|
void
|
|
pf_route6(struct pf_pdesc *pd, struct pf_state *st)
|
|
{
|
|
struct mbuf *m0;
|
|
struct sockaddr_in6 *dst, sin6;
|
|
struct rtentry *rt = NULL;
|
|
struct ip6_hdr *ip6;
|
|
struct ifnet *ifp = NULL;
|
|
struct m_tag *mtag;
|
|
unsigned int rtableid;
|
|
|
|
if (pd->m->m_pkthdr.pf.routed++ > 3) {
|
|
m_freem(pd->m);
|
|
pd->m = NULL;
|
|
return;
|
|
}
|
|
|
|
if (st->rt == PF_DUPTO) {
|
|
if ((m0 = m_dup_pkt(pd->m, max_linkhdr, M_NOWAIT)) == NULL)
|
|
return;
|
|
} else {
|
|
if ((st->rt == PF_REPLYTO) == (st->direction == pd->dir))
|
|
return;
|
|
m0 = pd->m;
|
|
pd->m = NULL;
|
|
}
|
|
|
|
if (m0->m_len < sizeof(struct ip6_hdr)) {
|
|
DPFPRINTF(LOG_ERR,
|
|
"%s: m0->m_len < sizeof(struct ip6_hdr)", __func__);
|
|
goto bad;
|
|
}
|
|
ip6 = mtod(m0, struct ip6_hdr *);
|
|
|
|
if (pd->dir == PF_IN) {
|
|
if (ip6->ip6_hlim <= IPV6_HLIMDEC) {
|
|
if (st->rt != PF_DUPTO) {
|
|
pf_send_icmp(m0, ICMP6_TIME_EXCEEDED,
|
|
ICMP6_TIME_EXCEED_TRANSIT, 0,
|
|
pd->af, st->rule.ptr, pd->rdomain);
|
|
}
|
|
goto bad;
|
|
}
|
|
ip6->ip6_hlim -= IPV6_HLIMDEC;
|
|
}
|
|
|
|
memset(&sin6, 0, sizeof(sin6));
|
|
dst = &sin6;
|
|
dst->sin6_family = AF_INET6;
|
|
dst->sin6_len = sizeof(*dst);
|
|
dst->sin6_addr = st->rt_addr.v6;
|
|
rtableid = m0->m_pkthdr.ph_rtableid;
|
|
|
|
rt = rtalloc_mpath(sin6tosa(dst), &ip6->ip6_src.s6_addr32[0],
|
|
rtableid);
|
|
if (!rtisvalid(rt)) {
|
|
if (st->rt != PF_DUPTO) {
|
|
pf_send_icmp(m0, ICMP6_DST_UNREACH,
|
|
ICMP6_DST_UNREACH_NOROUTE, 0,
|
|
pd->af, st->rule.ptr, pd->rdomain);
|
|
}
|
|
ip6stat_inc(ip6s_noroute);
|
|
goto bad;
|
|
}
|
|
|
|
ifp = if_get(rt->rt_ifidx);
|
|
if (ifp == NULL)
|
|
goto bad;
|
|
|
|
/* A locally generated packet may have invalid source address. */
|
|
if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
|
|
(ifp->if_flags & IFF_LOOPBACK) == 0)
|
|
ip6->ip6_src = ifatoia6(rt->rt_ifa)->ia_addr.sin6_addr;
|
|
|
|
if (st->rt != PF_DUPTO && pd->dir == PF_IN) {
|
|
if (pf_test(AF_INET6, PF_OUT, ifp, &m0) != PF_PASS)
|
|
goto bad;
|
|
else if (m0 == NULL)
|
|
goto done;
|
|
if (m0->m_len < sizeof(struct ip6_hdr)) {
|
|
DPFPRINTF(LOG_ERR,
|
|
"%s: m0->m_len < sizeof(struct ip6_hdr)", __func__);
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If packet has been reassembled by PF earlier, we have to
|
|
* use pf_refragment6() here to turn it back to fragments.
|
|
*/
|
|
if ((mtag = m_tag_find(m0, PACKET_TAG_PF_REASSEMBLED, NULL))) {
|
|
(void) pf_refragment6(&m0, mtag, dst, ifp, rt);
|
|
goto done;
|
|
}
|
|
|
|
if (if_output_tso(ifp, &m0, sin6tosa(dst), rt, ifp->if_mtu) ||
|
|
m0 == NULL)
|
|
goto done;
|
|
|
|
ip6stat_inc(ip6s_cantfrag);
|
|
if (st->rt != PF_DUPTO)
|
|
pf_send_icmp(m0, ICMP6_PACKET_TOO_BIG, 0,
|
|
ifp->if_mtu, pd->af, st->rule.ptr, pd->rdomain);
|
|
goto bad;
|
|
|
|
done:
|
|
if_put(ifp);
|
|
rtfree(rt);
|
|
return;
|
|
|
|
bad:
|
|
m_freem(m0);
|
|
goto done;
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
/*
|
|
* check TCP checksum and set mbuf flag
|
|
* off is the offset where the protocol header starts
|
|
* len is the total length of protocol header plus payload
|
|
* returns 0 when the checksum is valid, otherwise returns 1.
|
|
* if the _OUT flag is set the checksum isn't done yet, consider these ok
|
|
*/
|
|
int
|
|
pf_check_tcp_cksum(struct mbuf *m, int off, int len, sa_family_t af)
|
|
{
|
|
u_int16_t sum;
|
|
|
|
if (m->m_pkthdr.csum_flags &
|
|
(M_TCP_CSUM_IN_OK | M_TCP_CSUM_OUT)) {
|
|
return (0);
|
|
}
|
|
if (m->m_pkthdr.csum_flags & M_TCP_CSUM_IN_BAD ||
|
|
off < sizeof(struct ip) ||
|
|
m->m_pkthdr.len < off + len) {
|
|
return (1);
|
|
}
|
|
|
|
/* need to do it in software */
|
|
tcpstat_inc(tcps_inswcsum);
|
|
|
|
switch (af) {
|
|
case AF_INET:
|
|
if (m->m_len < sizeof(struct ip))
|
|
return (1);
|
|
|
|
sum = in4_cksum(m, IPPROTO_TCP, off, len);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (m->m_len < sizeof(struct ip6_hdr))
|
|
return (1);
|
|
|
|
sum = in6_cksum(m, IPPROTO_TCP, off, len);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
unhandled_af(af);
|
|
}
|
|
if (sum) {
|
|
tcpstat_inc(tcps_rcvbadsum);
|
|
m->m_pkthdr.csum_flags |= M_TCP_CSUM_IN_BAD;
|
|
return (1);
|
|
}
|
|
|
|
m->m_pkthdr.csum_flags |= M_TCP_CSUM_IN_OK;
|
|
return (0);
|
|
}
|
|
|
|
struct pf_divert *
|
|
pf_find_divert(struct mbuf *m)
|
|
{
|
|
struct m_tag *mtag;
|
|
|
|
if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL)
|
|
return (NULL);
|
|
|
|
return ((struct pf_divert *)(mtag + 1));
|
|
}
|
|
|
|
struct pf_divert *
|
|
pf_get_divert(struct mbuf *m)
|
|
{
|
|
struct m_tag *mtag;
|
|
|
|
if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) {
|
|
mtag = m_tag_get(PACKET_TAG_PF_DIVERT, sizeof(struct pf_divert),
|
|
M_NOWAIT);
|
|
if (mtag == NULL)
|
|
return (NULL);
|
|
memset(mtag + 1, 0, sizeof(struct pf_divert));
|
|
m_tag_prepend(m, mtag);
|
|
}
|
|
|
|
return ((struct pf_divert *)(mtag + 1));
|
|
}
|
|
|
|
int
|
|
pf_walk_option(struct pf_pdesc *pd, struct ip *h, int off, int end,
|
|
u_short *reason)
|
|
{
|
|
uint8_t type, length, opts[15 * 4 - sizeof(struct ip)];
|
|
|
|
/* IP header in payload of ICMP packet may be too short */
|
|
if (pd->m->m_pkthdr.len < end) {
|
|
DPFPRINTF(LOG_NOTICE, "IP option too short");
|
|
REASON_SET(reason, PFRES_SHORT);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
KASSERT(end - off <= sizeof(opts));
|
|
m_copydata(pd->m, off, end - off, opts);
|
|
end -= off;
|
|
off = 0;
|
|
|
|
while (off < end) {
|
|
type = opts[off];
|
|
if (type == IPOPT_EOL)
|
|
break;
|
|
if (type == IPOPT_NOP) {
|
|
off++;
|
|
continue;
|
|
}
|
|
if (off + 2 > end) {
|
|
DPFPRINTF(LOG_NOTICE, "IP length opt");
|
|
REASON_SET(reason, PFRES_IPOPTIONS);
|
|
return (PF_DROP);
|
|
}
|
|
length = opts[off + 1];
|
|
if (length < 2) {
|
|
DPFPRINTF(LOG_NOTICE, "IP short opt");
|
|
REASON_SET(reason, PFRES_IPOPTIONS);
|
|
return (PF_DROP);
|
|
}
|
|
if (off + length > end) {
|
|
DPFPRINTF(LOG_NOTICE, "IP long opt");
|
|
REASON_SET(reason, PFRES_IPOPTIONS);
|
|
return (PF_DROP);
|
|
}
|
|
switch (type) {
|
|
case IPOPT_RA:
|
|
SET(pd->badopts, PF_OPT_ROUTER_ALERT);
|
|
break;
|
|
default:
|
|
SET(pd->badopts, PF_OPT_OTHER);
|
|
break;
|
|
}
|
|
off += length;
|
|
}
|
|
|
|
return (PF_PASS);
|
|
}
|
|
|
|
int
|
|
pf_walk_header(struct pf_pdesc *pd, struct ip *h, u_short *reason)
|
|
{
|
|
struct ip6_ext ext;
|
|
u_int32_t hlen, end;
|
|
int hdr_cnt;
|
|
|
|
hlen = h->ip_hl << 2;
|
|
if (hlen < sizeof(struct ip) || hlen > ntohs(h->ip_len)) {
|
|
REASON_SET(reason, PFRES_SHORT);
|
|
return (PF_DROP);
|
|
}
|
|
if (hlen != sizeof(struct ip)) {
|
|
if (pf_walk_option(pd, h, pd->off + sizeof(struct ip),
|
|
pd->off + hlen, reason) != PF_PASS)
|
|
return (PF_DROP);
|
|
/* header options which contain only padding is fishy */
|
|
if (pd->badopts == 0)
|
|
SET(pd->badopts, PF_OPT_OTHER);
|
|
}
|
|
end = pd->off + ntohs(h->ip_len);
|
|
pd->off += hlen;
|
|
pd->proto = h->ip_p;
|
|
/* IGMP packets have router alert options, allow them */
|
|
if (pd->proto == IPPROTO_IGMP) {
|
|
/*
|
|
* According to RFC 1112 ttl must be set to 1 in all IGMP
|
|
* packets sent to 224.0.0.1
|
|
*/
|
|
if ((h->ip_ttl != 1) &&
|
|
(h->ip_dst.s_addr == INADDR_ALLHOSTS_GROUP)) {
|
|
DPFPRINTF(LOG_NOTICE, "Invalid IGMP");
|
|
REASON_SET(reason, PFRES_IPOPTIONS);
|
|
return (PF_DROP);
|
|
}
|
|
CLR(pd->badopts, PF_OPT_ROUTER_ALERT);
|
|
}
|
|
/* stop walking over non initial fragments */
|
|
if ((h->ip_off & htons(IP_OFFMASK)) != 0)
|
|
return (PF_PASS);
|
|
|
|
for (hdr_cnt = 0; hdr_cnt < pf_hdr_limit; hdr_cnt++) {
|
|
switch (pd->proto) {
|
|
case IPPROTO_AH:
|
|
/* fragments may be short */
|
|
if ((h->ip_off & htons(IP_MF | IP_OFFMASK)) != 0 &&
|
|
end < pd->off + sizeof(ext))
|
|
return (PF_PASS);
|
|
if (!pf_pull_hdr(pd->m, pd->off, &ext, sizeof(ext),
|
|
reason, AF_INET)) {
|
|
DPFPRINTF(LOG_NOTICE, "IP short exthdr");
|
|
return (PF_DROP);
|
|
}
|
|
pd->off += (ext.ip6e_len + 2) * 4;
|
|
pd->proto = ext.ip6e_nxt;
|
|
break;
|
|
default:
|
|
return (PF_PASS);
|
|
}
|
|
}
|
|
DPFPRINTF(LOG_NOTICE, "IPv4 nested authentication header limit");
|
|
REASON_SET(reason, PFRES_IPOPTIONS);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
#ifdef INET6
|
|
int
|
|
pf_walk_option6(struct pf_pdesc *pd, struct ip6_hdr *h, int off, int end,
|
|
u_short *reason)
|
|
{
|
|
struct ip6_opt opt;
|
|
struct ip6_opt_jumbo jumbo;
|
|
|
|
while (off < end) {
|
|
if (!pf_pull_hdr(pd->m, off, &opt.ip6o_type,
|
|
sizeof(opt.ip6o_type), reason, AF_INET6)) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 short opt type");
|
|
return (PF_DROP);
|
|
}
|
|
if (opt.ip6o_type == IP6OPT_PAD1) {
|
|
off++;
|
|
continue;
|
|
}
|
|
if (!pf_pull_hdr(pd->m, off, &opt, sizeof(opt),
|
|
reason, AF_INET6)) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 short opt");
|
|
return (PF_DROP);
|
|
}
|
|
if (off + sizeof(opt) + opt.ip6o_len > end) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 long opt");
|
|
REASON_SET(reason, PFRES_IPOPTIONS);
|
|
return (PF_DROP);
|
|
}
|
|
switch (opt.ip6o_type) {
|
|
case IP6OPT_PADN:
|
|
break;
|
|
case IP6OPT_JUMBO:
|
|
SET(pd->badopts, PF_OPT_JUMBO);
|
|
if (pd->jumbolen != 0) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 multiple jumbo");
|
|
REASON_SET(reason, PFRES_IPOPTIONS);
|
|
return (PF_DROP);
|
|
}
|
|
if (ntohs(h->ip6_plen) != 0) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 bad jumbo plen");
|
|
REASON_SET(reason, PFRES_IPOPTIONS);
|
|
return (PF_DROP);
|
|
}
|
|
if (!pf_pull_hdr(pd->m, off, &jumbo, sizeof(jumbo),
|
|
reason, AF_INET6)) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 short jumbo");
|
|
return (PF_DROP);
|
|
}
|
|
memcpy(&pd->jumbolen, jumbo.ip6oj_jumbo_len,
|
|
sizeof(pd->jumbolen));
|
|
pd->jumbolen = ntohl(pd->jumbolen);
|
|
if (pd->jumbolen < IPV6_MAXPACKET) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 short jumbolen");
|
|
REASON_SET(reason, PFRES_IPOPTIONS);
|
|
return (PF_DROP);
|
|
}
|
|
break;
|
|
case IP6OPT_ROUTER_ALERT:
|
|
SET(pd->badopts, PF_OPT_ROUTER_ALERT);
|
|
break;
|
|
default:
|
|
SET(pd->badopts, PF_OPT_OTHER);
|
|
break;
|
|
}
|
|
off += sizeof(opt) + opt.ip6o_len;
|
|
}
|
|
|
|
return (PF_PASS);
|
|
}
|
|
|
|
int
|
|
pf_walk_header6(struct pf_pdesc *pd, struct ip6_hdr *h, u_short *reason)
|
|
{
|
|
struct ip6_frag frag;
|
|
struct ip6_ext ext;
|
|
struct icmp6_hdr icmp6;
|
|
struct ip6_rthdr rthdr;
|
|
u_int32_t end;
|
|
int hdr_cnt, fraghdr_cnt = 0, rthdr_cnt = 0;
|
|
|
|
pd->off += sizeof(struct ip6_hdr);
|
|
end = pd->off + ntohs(h->ip6_plen);
|
|
pd->fragoff = pd->extoff = pd->jumbolen = 0;
|
|
pd->proto = h->ip6_nxt;
|
|
|
|
for (hdr_cnt = 0; hdr_cnt < pf_hdr_limit; hdr_cnt++) {
|
|
switch (pd->proto) {
|
|
case IPPROTO_ROUTING:
|
|
case IPPROTO_DSTOPTS:
|
|
SET(pd->badopts, PF_OPT_OTHER);
|
|
break;
|
|
case IPPROTO_HOPOPTS:
|
|
if (!pf_pull_hdr(pd->m, pd->off, &ext, sizeof(ext),
|
|
reason, AF_INET6)) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 short exthdr");
|
|
return (PF_DROP);
|
|
}
|
|
if (pf_walk_option6(pd, h, pd->off + sizeof(ext),
|
|
pd->off + (ext.ip6e_len + 1) * 8, reason)
|
|
!= PF_PASS)
|
|
return (PF_DROP);
|
|
/* option header which contains only padding is fishy */
|
|
if (pd->badopts == 0)
|
|
SET(pd->badopts, PF_OPT_OTHER);
|
|
break;
|
|
}
|
|
switch (pd->proto) {
|
|
case IPPROTO_FRAGMENT:
|
|
if (fraghdr_cnt++) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 multiple fragment");
|
|
REASON_SET(reason, PFRES_FRAG);
|
|
return (PF_DROP);
|
|
}
|
|
/* jumbo payload packets cannot be fragmented */
|
|
if (pd->jumbolen != 0) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 fragmented jumbo");
|
|
REASON_SET(reason, PFRES_FRAG);
|
|
return (PF_DROP);
|
|
}
|
|
if (!pf_pull_hdr(pd->m, pd->off, &frag, sizeof(frag),
|
|
reason, AF_INET6)) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 short fragment");
|
|
return (PF_DROP);
|
|
}
|
|
/* stop walking over non initial fragments */
|
|
if (ntohs((frag.ip6f_offlg & IP6F_OFF_MASK)) != 0) {
|
|
pd->fragoff = pd->off;
|
|
return (PF_PASS);
|
|
}
|
|
/* RFC6946: reassemble only non atomic fragments */
|
|
if (frag.ip6f_offlg & IP6F_MORE_FRAG)
|
|
pd->fragoff = pd->off;
|
|
pd->off += sizeof(frag);
|
|
pd->proto = frag.ip6f_nxt;
|
|
break;
|
|
case IPPROTO_ROUTING:
|
|
if (rthdr_cnt++) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 multiple rthdr");
|
|
REASON_SET(reason, PFRES_IPOPTIONS);
|
|
return (PF_DROP);
|
|
}
|
|
/* fragments may be short */
|
|
if (pd->fragoff != 0 && end < pd->off + sizeof(rthdr)) {
|
|
pd->off = pd->fragoff;
|
|
pd->proto = IPPROTO_FRAGMENT;
|
|
return (PF_PASS);
|
|
}
|
|
if (!pf_pull_hdr(pd->m, pd->off, &rthdr, sizeof(rthdr),
|
|
reason, AF_INET6)) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 short rthdr");
|
|
return (PF_DROP);
|
|
}
|
|
if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 rthdr0");
|
|
REASON_SET(reason, PFRES_IPOPTIONS);
|
|
return (PF_DROP);
|
|
}
|
|
/* FALLTHROUGH */
|
|
case IPPROTO_HOPOPTS:
|
|
/* RFC2460 4.1: Hop-by-Hop only after IPv6 header */
|
|
if (pd->proto == IPPROTO_HOPOPTS && hdr_cnt > 0) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 hopopts not first");
|
|
REASON_SET(reason, PFRES_IPOPTIONS);
|
|
return (PF_DROP);
|
|
}
|
|
/* FALLTHROUGH */
|
|
case IPPROTO_AH:
|
|
case IPPROTO_DSTOPTS:
|
|
/* fragments may be short */
|
|
if (pd->fragoff != 0 && end < pd->off + sizeof(ext)) {
|
|
pd->off = pd->fragoff;
|
|
pd->proto = IPPROTO_FRAGMENT;
|
|
return (PF_PASS);
|
|
}
|
|
if (!pf_pull_hdr(pd->m, pd->off, &ext, sizeof(ext),
|
|
reason, AF_INET6)) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 short exthdr");
|
|
return (PF_DROP);
|
|
}
|
|
/* reassembly needs the ext header before the frag */
|
|
if (pd->fragoff == 0)
|
|
pd->extoff = pd->off;
|
|
if (pd->proto == IPPROTO_HOPOPTS && pd->fragoff == 0 &&
|
|
ntohs(h->ip6_plen) == 0 && pd->jumbolen != 0) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 missing jumbo");
|
|
REASON_SET(reason, PFRES_IPOPTIONS);
|
|
return (PF_DROP);
|
|
}
|
|
if (pd->proto == IPPROTO_AH)
|
|
pd->off += (ext.ip6e_len + 2) * 4;
|
|
else
|
|
pd->off += (ext.ip6e_len + 1) * 8;
|
|
pd->proto = ext.ip6e_nxt;
|
|
break;
|
|
case IPPROTO_ICMPV6:
|
|
/* fragments may be short, ignore inner header then */
|
|
if (pd->fragoff != 0 && end < pd->off + sizeof(icmp6)) {
|
|
pd->off = pd->fragoff;
|
|
pd->proto = IPPROTO_FRAGMENT;
|
|
return (PF_PASS);
|
|
}
|
|
if (!pf_pull_hdr(pd->m, pd->off, &icmp6, sizeof(icmp6),
|
|
reason, AF_INET6)) {
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 short icmp6hdr");
|
|
return (PF_DROP);
|
|
}
|
|
/* ICMP multicast packets have router alert options */
|
|
switch (icmp6.icmp6_type) {
|
|
case MLD_LISTENER_QUERY:
|
|
case MLD_LISTENER_REPORT:
|
|
case MLD_LISTENER_DONE:
|
|
case MLDV2_LISTENER_REPORT:
|
|
/*
|
|
* According to RFC 2710 all MLD messages are
|
|
* sent with hop-limit (ttl) set to 1, and link
|
|
* local source address. If either one is
|
|
* missing then MLD message is invalid and
|
|
* should be discarded.
|
|
*/
|
|
if ((h->ip6_hlim != 1) ||
|
|
!IN6_IS_ADDR_LINKLOCAL(&h->ip6_src)) {
|
|
DPFPRINTF(LOG_NOTICE, "Invalid MLD");
|
|
REASON_SET(reason, PFRES_IPOPTIONS);
|
|
return (PF_DROP);
|
|
}
|
|
CLR(pd->badopts, PF_OPT_ROUTER_ALERT);
|
|
break;
|
|
}
|
|
return (PF_PASS);
|
|
case IPPROTO_TCP:
|
|
case IPPROTO_UDP:
|
|
/* fragments may be short, ignore inner header then */
|
|
if (pd->fragoff != 0 && end < pd->off +
|
|
(pd->proto == IPPROTO_TCP ? sizeof(struct tcphdr) :
|
|
pd->proto == IPPROTO_UDP ? sizeof(struct udphdr) :
|
|
sizeof(struct icmp6_hdr))) {
|
|
pd->off = pd->fragoff;
|
|
pd->proto = IPPROTO_FRAGMENT;
|
|
}
|
|
/* FALLTHROUGH */
|
|
default:
|
|
return (PF_PASS);
|
|
}
|
|
}
|
|
DPFPRINTF(LOG_NOTICE, "IPv6 nested extension header limit");
|
|
REASON_SET(reason, PFRES_IPOPTIONS);
|
|
return (PF_DROP);
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
u_int16_t
|
|
pf_pkt_hash(sa_family_t af, uint8_t proto,
|
|
const struct pf_addr *src, const struct pf_addr *dst,
|
|
uint16_t sport, uint16_t dport)
|
|
{
|
|
uint32_t hash;
|
|
|
|
hash = src->addr32[0] ^ dst->addr32[0];
|
|
#ifdef INET6
|
|
if (af == AF_INET6) {
|
|
hash ^= src->addr32[1] ^ dst->addr32[1];
|
|
hash ^= src->addr32[2] ^ dst->addr32[2];
|
|
hash ^= src->addr32[3] ^ dst->addr32[3];
|
|
}
|
|
#endif
|
|
|
|
switch (proto) {
|
|
case IPPROTO_TCP:
|
|
case IPPROTO_UDP:
|
|
hash ^= sport ^ dport;
|
|
break;
|
|
}
|
|
|
|
return stoeplitz_n32(hash);
|
|
}
|
|
|
|
int
|
|
pf_setup_pdesc(struct pf_pdesc *pd, sa_family_t af, int dir,
|
|
struct pfi_kif *kif, struct mbuf *m, u_short *reason)
|
|
{
|
|
memset(pd, 0, sizeof(*pd));
|
|
pd->dir = dir;
|
|
pd->kif = kif; /* kif is NULL when called by pflog */
|
|
pd->m = m;
|
|
pd->sidx = (dir == PF_IN) ? 0 : 1;
|
|
pd->didx = (dir == PF_IN) ? 1 : 0;
|
|
pd->af = pd->naf = af;
|
|
pd->rdomain = rtable_l2(pd->m->m_pkthdr.ph_rtableid);
|
|
|
|
switch (pd->af) {
|
|
case AF_INET: {
|
|
struct ip *h;
|
|
|
|
/* Check for illegal packets */
|
|
if (pd->m->m_pkthdr.len < (int)sizeof(struct ip)) {
|
|
REASON_SET(reason, PFRES_SHORT);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
h = mtod(pd->m, struct ip *);
|
|
if (pd->m->m_pkthdr.len < ntohs(h->ip_len)) {
|
|
REASON_SET(reason, PFRES_SHORT);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
if (pf_walk_header(pd, h, reason) != PF_PASS)
|
|
return (PF_DROP);
|
|
|
|
pd->src = (struct pf_addr *)&h->ip_src;
|
|
pd->dst = (struct pf_addr *)&h->ip_dst;
|
|
pd->tot_len = ntohs(h->ip_len);
|
|
pd->tos = h->ip_tos & ~IPTOS_ECN_MASK;
|
|
pd->ttl = h->ip_ttl;
|
|
pd->virtual_proto = (h->ip_off & htons(IP_MF | IP_OFFMASK)) ?
|
|
PF_VPROTO_FRAGMENT : pd->proto;
|
|
|
|
break;
|
|
}
|
|
#ifdef INET6
|
|
case AF_INET6: {
|
|
struct ip6_hdr *h;
|
|
|
|
/* Check for illegal packets */
|
|
if (pd->m->m_pkthdr.len < (int)sizeof(struct ip6_hdr)) {
|
|
REASON_SET(reason, PFRES_SHORT);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
h = mtod(pd->m, struct ip6_hdr *);
|
|
if (pd->m->m_pkthdr.len <
|
|
sizeof(struct ip6_hdr) + ntohs(h->ip6_plen)) {
|
|
REASON_SET(reason, PFRES_SHORT);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
if (pf_walk_header6(pd, h, reason) != PF_PASS)
|
|
return (PF_DROP);
|
|
|
|
#if 1
|
|
/*
|
|
* we do not support jumbogram yet. if we keep going, zero
|
|
* ip6_plen will do something bad, so drop the packet for now.
|
|
*/
|
|
if (pd->jumbolen != 0) {
|
|
REASON_SET(reason, PFRES_NORM);
|
|
return (PF_DROP);
|
|
}
|
|
#endif /* 1 */
|
|
|
|
pd->src = (struct pf_addr *)&h->ip6_src;
|
|
pd->dst = (struct pf_addr *)&h->ip6_dst;
|
|
pd->tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
|
|
pd->tos = (ntohl(h->ip6_flow) & 0x0fc00000) >> 20;
|
|
pd->ttl = h->ip6_hlim;
|
|
pd->virtual_proto = (pd->fragoff != 0) ?
|
|
PF_VPROTO_FRAGMENT : pd->proto;
|
|
|
|
break;
|
|
}
|
|
#endif /* INET6 */
|
|
default:
|
|
panic("pf_setup_pdesc called with illegal af %u", pd->af);
|
|
|
|
}
|
|
|
|
pf_addrcpy(&pd->nsaddr, pd->src, pd->af);
|
|
pf_addrcpy(&pd->ndaddr, pd->dst, pd->af);
|
|
|
|
switch (pd->virtual_proto) {
|
|
case IPPROTO_TCP: {
|
|
struct tcphdr *th = &pd->hdr.tcp;
|
|
|
|
if (!pf_pull_hdr(pd->m, pd->off, th, sizeof(*th),
|
|
reason, pd->af))
|
|
return (PF_DROP);
|
|
pd->hdrlen = sizeof(*th);
|
|
if (th->th_dport == 0 ||
|
|
pd->off + (th->th_off << 2) > pd->tot_len ||
|
|
(th->th_off << 2) < sizeof(struct tcphdr)) {
|
|
REASON_SET(reason, PFRES_SHORT);
|
|
return (PF_DROP);
|
|
}
|
|
pd->p_len = pd->tot_len - pd->off - (th->th_off << 2);
|
|
pd->sport = &th->th_sport;
|
|
pd->dport = &th->th_dport;
|
|
pd->pcksum = &th->th_sum;
|
|
break;
|
|
}
|
|
case IPPROTO_UDP: {
|
|
struct udphdr *uh = &pd->hdr.udp;
|
|
|
|
if (!pf_pull_hdr(pd->m, pd->off, uh, sizeof(*uh),
|
|
reason, pd->af))
|
|
return (PF_DROP);
|
|
pd->hdrlen = sizeof(*uh);
|
|
if (uh->uh_dport == 0 ||
|
|
pd->off + ntohs(uh->uh_ulen) > pd->tot_len ||
|
|
ntohs(uh->uh_ulen) < sizeof(struct udphdr)) {
|
|
REASON_SET(reason, PFRES_SHORT);
|
|
return (PF_DROP);
|
|
}
|
|
pd->sport = &uh->uh_sport;
|
|
pd->dport = &uh->uh_dport;
|
|
pd->pcksum = &uh->uh_sum;
|
|
break;
|
|
}
|
|
case IPPROTO_ICMP: {
|
|
if (!pf_pull_hdr(pd->m, pd->off, &pd->hdr.icmp, ICMP_MINLEN,
|
|
reason, pd->af))
|
|
return (PF_DROP);
|
|
pd->hdrlen = ICMP_MINLEN;
|
|
if (pd->off + pd->hdrlen > pd->tot_len) {
|
|
REASON_SET(reason, PFRES_SHORT);
|
|
return (PF_DROP);
|
|
}
|
|
pd->pcksum = &pd->hdr.icmp.icmp_cksum;
|
|
break;
|
|
}
|
|
#ifdef INET6
|
|
case IPPROTO_ICMPV6: {
|
|
size_t icmp_hlen = sizeof(struct icmp6_hdr);
|
|
|
|
if (!pf_pull_hdr(pd->m, pd->off, &pd->hdr.icmp6, icmp_hlen,
|
|
reason, pd->af))
|
|
return (PF_DROP);
|
|
/* ICMP headers we look further into to match state */
|
|
switch (pd->hdr.icmp6.icmp6_type) {
|
|
case MLD_LISTENER_QUERY:
|
|
case MLD_LISTENER_REPORT:
|
|
icmp_hlen = sizeof(struct mld_hdr);
|
|
break;
|
|
case ND_NEIGHBOR_SOLICIT:
|
|
case ND_NEIGHBOR_ADVERT:
|
|
icmp_hlen = sizeof(struct nd_neighbor_solicit);
|
|
/* FALLTHROUGH */
|
|
case ND_ROUTER_SOLICIT:
|
|
case ND_ROUTER_ADVERT:
|
|
case ND_REDIRECT:
|
|
if (pd->ttl != 255) {
|
|
REASON_SET(reason, PFRES_NORM);
|
|
return (PF_DROP);
|
|
}
|
|
break;
|
|
}
|
|
if (icmp_hlen > sizeof(struct icmp6_hdr) &&
|
|
!pf_pull_hdr(pd->m, pd->off, &pd->hdr.icmp6, icmp_hlen,
|
|
reason, pd->af))
|
|
return (PF_DROP);
|
|
pd->hdrlen = icmp_hlen;
|
|
if (pd->off + pd->hdrlen > pd->tot_len) {
|
|
REASON_SET(reason, PFRES_SHORT);
|
|
return (PF_DROP);
|
|
}
|
|
pd->pcksum = &pd->hdr.icmp6.icmp6_cksum;
|
|
break;
|
|
}
|
|
#endif /* INET6 */
|
|
}
|
|
|
|
if (pd->sport)
|
|
pd->osport = pd->nsport = *pd->sport;
|
|
if (pd->dport)
|
|
pd->odport = pd->ndport = *pd->dport;
|
|
|
|
pd->hash = pf_pkt_hash(pd->af, pd->proto,
|
|
pd->src, pd->dst, pd->osport, pd->odport);
|
|
|
|
return (PF_PASS);
|
|
}
|
|
|
|
void
|
|
pf_counters_inc(int action, struct pf_pdesc *pd, struct pf_state *st,
|
|
struct pf_rule *r, struct pf_rule *a)
|
|
{
|
|
int dirndx;
|
|
pd->kif->pfik_bytes[pd->af == AF_INET6][pd->dir == PF_OUT]
|
|
[action != PF_PASS] += pd->tot_len;
|
|
pd->kif->pfik_packets[pd->af == AF_INET6][pd->dir == PF_OUT]
|
|
[action != PF_PASS]++;
|
|
|
|
if (action == PF_PASS || action == PF_AFRT || r->action == PF_DROP) {
|
|
dirndx = (pd->dir == PF_OUT);
|
|
r->packets[dirndx]++;
|
|
r->bytes[dirndx] += pd->tot_len;
|
|
if (a != NULL) {
|
|
a->packets[dirndx]++;
|
|
a->bytes[dirndx] += pd->tot_len;
|
|
}
|
|
if (st != NULL) {
|
|
struct pf_rule_item *ri;
|
|
struct pf_sn_item *sni;
|
|
|
|
SLIST_FOREACH(sni, &st->src_nodes, next) {
|
|
sni->sn->packets[dirndx]++;
|
|
sni->sn->bytes[dirndx] += pd->tot_len;
|
|
}
|
|
dirndx = (pd->dir == st->direction) ? 0 : 1;
|
|
st->packets[dirndx]++;
|
|
st->bytes[dirndx] += pd->tot_len;
|
|
|
|
SLIST_FOREACH(ri, &st->match_rules, entry) {
|
|
ri->r->packets[dirndx]++;
|
|
ri->r->bytes[dirndx] += pd->tot_len;
|
|
|
|
if (ri->r->src.addr.type == PF_ADDR_TABLE)
|
|
pfr_update_stats(ri->r->src.addr.p.tbl,
|
|
&st->key[(st->direction == PF_IN)]->
|
|
addr[(st->direction == PF_OUT)],
|
|
pd, ri->r->action, ri->r->src.neg);
|
|
if (ri->r->dst.addr.type == PF_ADDR_TABLE)
|
|
pfr_update_stats(ri->r->dst.addr.p.tbl,
|
|
&st->key[(st->direction == PF_IN)]->
|
|
addr[(st->direction == PF_IN)],
|
|
pd, ri->r->action, ri->r->dst.neg);
|
|
}
|
|
}
|
|
if (r->src.addr.type == PF_ADDR_TABLE)
|
|
pfr_update_stats(r->src.addr.p.tbl,
|
|
(st == NULL) ? pd->src :
|
|
&st->key[(st->direction == PF_IN)]->
|
|
addr[(st->direction == PF_OUT)],
|
|
pd, r->action, r->src.neg);
|
|
if (r->dst.addr.type == PF_ADDR_TABLE)
|
|
pfr_update_stats(r->dst.addr.p.tbl,
|
|
(st == NULL) ? pd->dst :
|
|
&st->key[(st->direction == PF_IN)]->
|
|
addr[(st->direction == PF_IN)],
|
|
pd, r->action, r->dst.neg);
|
|
}
|
|
}
|
|
|
|
int
|
|
pf_test(sa_family_t af, int fwdir, struct ifnet *ifp, struct mbuf **m0)
|
|
{
|
|
#if NCARP > 0
|
|
struct ifnet *ifp0;
|
|
#endif
|
|
struct pfi_kif *kif;
|
|
u_short action, reason = 0;
|
|
struct pf_rule *a = NULL, *r = &pf_default_rule;
|
|
struct pf_state *st = NULL;
|
|
struct pf_state_key_cmp key;
|
|
struct pf_ruleset *ruleset = NULL;
|
|
struct pf_pdesc pd;
|
|
int dir = (fwdir == PF_FWD) ? PF_OUT : fwdir;
|
|
u_int32_t qid, pqid = 0;
|
|
int have_pf_lock = 0;
|
|
|
|
if (!pf_status.running)
|
|
return (PF_PASS);
|
|
|
|
#if NCARP > 0
|
|
if (ifp->if_type == IFT_CARP &&
|
|
(ifp0 = if_get(ifp->if_carpdevidx)) != NULL) {
|
|
kif = (struct pfi_kif *)ifp0->if_pf_kif;
|
|
if_put(ifp0);
|
|
} else
|
|
#endif /* NCARP */
|
|
kif = (struct pfi_kif *)ifp->if_pf_kif;
|
|
|
|
if (kif == NULL) {
|
|
DPFPRINTF(LOG_ERR,
|
|
"%s: kif == NULL, if_xname %s", __func__, ifp->if_xname);
|
|
return (PF_DROP);
|
|
}
|
|
if (kif->pfik_flags & PFI_IFLAG_SKIP)
|
|
return (PF_PASS);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (((*m0)->m_flags & M_PKTHDR) == 0)
|
|
panic("non-M_PKTHDR is passed to pf_test");
|
|
#endif /* DIAGNOSTIC */
|
|
|
|
if ((*m0)->m_pkthdr.pf.flags & PF_TAG_GENERATED)
|
|
return (PF_PASS);
|
|
|
|
if ((*m0)->m_pkthdr.pf.flags & PF_TAG_DIVERTED_PACKET) {
|
|
(*m0)->m_pkthdr.pf.flags &= ~PF_TAG_DIVERTED_PACKET;
|
|
return (PF_PASS);
|
|
}
|
|
|
|
if ((*m0)->m_pkthdr.pf.flags & PF_TAG_REFRAGMENTED) {
|
|
(*m0)->m_pkthdr.pf.flags &= ~PF_TAG_REFRAGMENTED;
|
|
return (PF_PASS);
|
|
}
|
|
|
|
action = pf_setup_pdesc(&pd, af, dir, kif, *m0, &reason);
|
|
if (action != PF_PASS) {
|
|
#if NPFLOG > 0
|
|
pd.pflog |= PF_LOG_FORCE;
|
|
#endif /* NPFLOG > 0 */
|
|
goto done;
|
|
}
|
|
|
|
/* packet normalization and reassembly */
|
|
switch (pd.af) {
|
|
case AF_INET:
|
|
action = pf_normalize_ip(&pd, &reason);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
action = pf_normalize_ip6(&pd, &reason);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
*m0 = pd.m;
|
|
/* if packet sits in reassembly queue, return without error */
|
|
if (pd.m == NULL)
|
|
return PF_PASS;
|
|
|
|
if (action != PF_PASS) {
|
|
#if NPFLOG > 0
|
|
pd.pflog |= PF_LOG_FORCE;
|
|
#endif /* NPFLOG > 0 */
|
|
goto done;
|
|
}
|
|
|
|
/* if packet has been reassembled, update packet description */
|
|
if (pf_status.reass && pd.virtual_proto == PF_VPROTO_FRAGMENT) {
|
|
action = pf_setup_pdesc(&pd, af, dir, kif, pd.m, &reason);
|
|
if (action != PF_PASS) {
|
|
#if NPFLOG > 0
|
|
pd.pflog |= PF_LOG_FORCE;
|
|
#endif /* NPFLOG > 0 */
|
|
goto done;
|
|
}
|
|
}
|
|
pd.m->m_pkthdr.pf.flags |= PF_TAG_PROCESSED;
|
|
|
|
/*
|
|
* Avoid pcb-lookups from the forwarding path. They should never
|
|
* match and would cause MP locking problems.
|
|
*/
|
|
if (fwdir == PF_FWD) {
|
|
pd.lookup.done = -1;
|
|
pd.lookup.uid = -1;
|
|
pd.lookup.gid = -1;
|
|
pd.lookup.pid = NO_PID;
|
|
}
|
|
|
|
switch (pd.virtual_proto) {
|
|
|
|
case PF_VPROTO_FRAGMENT: {
|
|
/*
|
|
* handle fragments that aren't reassembled by
|
|
* normalization
|
|
*/
|
|
PF_LOCK();
|
|
have_pf_lock = 1;
|
|
action = pf_test_rule(&pd, &r, &st, &a, &ruleset, &reason);
|
|
st = pf_state_ref(st);
|
|
if (action != PF_PASS)
|
|
REASON_SET(&reason, PFRES_FRAG);
|
|
break;
|
|
}
|
|
|
|
case IPPROTO_ICMP: {
|
|
if (pd.af != AF_INET) {
|
|
action = PF_DROP;
|
|
REASON_SET(&reason, PFRES_NORM);
|
|
DPFPRINTF(LOG_NOTICE,
|
|
"dropping IPv6 packet with ICMPv4 payload");
|
|
break;
|
|
}
|
|
PF_STATE_ENTER_READ();
|
|
action = pf_test_state_icmp(&pd, &st, &reason);
|
|
st = pf_state_ref(st);
|
|
PF_STATE_EXIT_READ();
|
|
if (action == PF_PASS || action == PF_AFRT) {
|
|
#if NPFSYNC > 0
|
|
pfsync_update_state(st);
|
|
#endif /* NPFSYNC > 0 */
|
|
r = st->rule.ptr;
|
|
a = st->anchor.ptr;
|
|
#if NPFLOG > 0
|
|
pd.pflog |= st->log;
|
|
#endif /* NPFLOG > 0 */
|
|
} else if (st == NULL) {
|
|
PF_LOCK();
|
|
have_pf_lock = 1;
|
|
action = pf_test_rule(&pd, &r, &st, &a, &ruleset,
|
|
&reason);
|
|
st = pf_state_ref(st);
|
|
}
|
|
break;
|
|
}
|
|
|
|
#ifdef INET6
|
|
case IPPROTO_ICMPV6: {
|
|
if (pd.af != AF_INET6) {
|
|
action = PF_DROP;
|
|
REASON_SET(&reason, PFRES_NORM);
|
|
DPFPRINTF(LOG_NOTICE,
|
|
"dropping IPv4 packet with ICMPv6 payload");
|
|
break;
|
|
}
|
|
PF_STATE_ENTER_READ();
|
|
action = pf_test_state_icmp(&pd, &st, &reason);
|
|
st = pf_state_ref(st);
|
|
PF_STATE_EXIT_READ();
|
|
if (action == PF_PASS || action == PF_AFRT) {
|
|
#if NPFSYNC > 0
|
|
pfsync_update_state(st);
|
|
#endif /* NPFSYNC > 0 */
|
|
r = st->rule.ptr;
|
|
a = st->anchor.ptr;
|
|
#if NPFLOG > 0
|
|
pd.pflog |= st->log;
|
|
#endif /* NPFLOG > 0 */
|
|
} else if (st == NULL) {
|
|
PF_LOCK();
|
|
have_pf_lock = 1;
|
|
action = pf_test_rule(&pd, &r, &st, &a, &ruleset,
|
|
&reason);
|
|
st = pf_state_ref(st);
|
|
}
|
|
break;
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
default:
|
|
if (pd.virtual_proto == IPPROTO_TCP) {
|
|
if (pd.dir == PF_IN && (pd.hdr.tcp.th_flags &
|
|
(TH_SYN|TH_ACK)) == TH_SYN &&
|
|
pf_synflood_check(&pd)) {
|
|
PF_LOCK();
|
|
have_pf_lock = 1;
|
|
pf_syncookie_send(&pd);
|
|
action = PF_DROP;
|
|
break;
|
|
}
|
|
if ((pd.hdr.tcp.th_flags & TH_ACK) && pd.p_len == 0)
|
|
pqid = 1;
|
|
action = pf_normalize_tcp(&pd);
|
|
if (action == PF_DROP)
|
|
break;
|
|
}
|
|
|
|
key.af = pd.af;
|
|
key.proto = pd.virtual_proto;
|
|
key.rdomain = pd.rdomain;
|
|
pf_addrcpy(&key.addr[pd.sidx], pd.src, key.af);
|
|
pf_addrcpy(&key.addr[pd.didx], pd.dst, key.af);
|
|
key.port[pd.sidx] = pd.osport;
|
|
key.port[pd.didx] = pd.odport;
|
|
key.hash = pd.hash;
|
|
|
|
PF_STATE_ENTER_READ();
|
|
action = pf_find_state(&pd, &key, &st);
|
|
st = pf_state_ref(st);
|
|
PF_STATE_EXIT_READ();
|
|
|
|
/* check for syncookies if tcp ack and no active state */
|
|
if (pd.dir == PF_IN && pd.virtual_proto == IPPROTO_TCP &&
|
|
(st == NULL || (st->src.state >= TCPS_FIN_WAIT_2 &&
|
|
st->dst.state >= TCPS_FIN_WAIT_2)) &&
|
|
(pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_ACK &&
|
|
pf_syncookie_validate(&pd)) {
|
|
struct mbuf *msyn = pf_syncookie_recreate_syn(&pd);
|
|
if (msyn) {
|
|
action = pf_test(af, fwdir, ifp, &msyn);
|
|
m_freem(msyn);
|
|
if (action == PF_PASS || action == PF_AFRT) {
|
|
PF_STATE_ENTER_READ();
|
|
pf_state_unref(st);
|
|
action = pf_find_state(&pd, &key, &st);
|
|
st = pf_state_ref(st);
|
|
PF_STATE_EXIT_READ();
|
|
if (st == NULL)
|
|
return (PF_DROP);
|
|
st->src.seqhi = st->dst.seqhi =
|
|
ntohl(pd.hdr.tcp.th_ack) - 1;
|
|
st->src.seqlo =
|
|
ntohl(pd.hdr.tcp.th_seq) - 1;
|
|
pf_set_protostate(st, PF_PEER_SRC,
|
|
PF_TCPS_PROXY_DST);
|
|
}
|
|
} else
|
|
action = PF_DROP;
|
|
}
|
|
|
|
if (action == PF_MATCH)
|
|
action = pf_test_state(&pd, &st, &reason);
|
|
|
|
if (action == PF_PASS || action == PF_AFRT) {
|
|
#if NPFSYNC > 0
|
|
pfsync_update_state(st);
|
|
#endif /* NPFSYNC > 0 */
|
|
r = st->rule.ptr;
|
|
a = st->anchor.ptr;
|
|
#if NPFLOG > 0
|
|
pd.pflog |= st->log;
|
|
#endif /* NPFLOG > 0 */
|
|
} else if (st == NULL) {
|
|
PF_LOCK();
|
|
have_pf_lock = 1;
|
|
action = pf_test_rule(&pd, &r, &st, &a, &ruleset,
|
|
&reason);
|
|
st = pf_state_ref(st);
|
|
}
|
|
|
|
if (pd.virtual_proto == IPPROTO_TCP) {
|
|
if (st) {
|
|
if (st->max_mss)
|
|
pf_normalize_mss(&pd, st->max_mss);
|
|
} else if (r->max_mss)
|
|
pf_normalize_mss(&pd, r->max_mss);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
if (have_pf_lock != 0)
|
|
PF_UNLOCK();
|
|
|
|
/*
|
|
* At the moment, we rely on NET_LOCK() to prevent removal of items
|
|
* we've collected above ('r', 'anchor' and 'ruleset'). They'll have
|
|
* to be refcounted when NET_LOCK() is gone.
|
|
*/
|
|
|
|
done:
|
|
if (action != PF_DROP) {
|
|
if (st) {
|
|
/* The non-state case is handled in pf_test_rule() */
|
|
if (action == PF_PASS && pd.badopts != 0 &&
|
|
!(st->state_flags & PFSTATE_ALLOWOPTS)) {
|
|
action = PF_DROP;
|
|
REASON_SET(&reason, PFRES_IPOPTIONS);
|
|
#if NPFLOG > 0
|
|
pd.pflog |= PF_LOG_FORCE;
|
|
#endif /* NPFLOG > 0 */
|
|
DPFPRINTF(LOG_NOTICE, "dropping packet with "
|
|
"ip/ipv6 options in pf_test()");
|
|
}
|
|
|
|
pf_scrub(pd.m, st->state_flags, pd.af, st->min_ttl,
|
|
st->set_tos);
|
|
pf_tag_packet(pd.m, st->tag, st->rtableid[pd.didx]);
|
|
if (pqid || (pd.tos & IPTOS_LOWDELAY)) {
|
|
qid = st->pqid;
|
|
if (st->state_flags & PFSTATE_SETPRIO) {
|
|
pd.m->m_pkthdr.pf.prio =
|
|
st->set_prio[1];
|
|
}
|
|
} else {
|
|
qid = st->qid;
|
|
if (st->state_flags & PFSTATE_SETPRIO) {
|
|
pd.m->m_pkthdr.pf.prio =
|
|
st->set_prio[0];
|
|
}
|
|
}
|
|
pd.m->m_pkthdr.pf.delay = st->delay;
|
|
} else {
|
|
pf_scrub(pd.m, r->scrub_flags, pd.af, r->min_ttl,
|
|
r->set_tos);
|
|
if (pqid || (pd.tos & IPTOS_LOWDELAY)) {
|
|
qid = r->pqid;
|
|
if (r->scrub_flags & PFSTATE_SETPRIO)
|
|
pd.m->m_pkthdr.pf.prio = r->set_prio[1];
|
|
} else {
|
|
qid = r->qid;
|
|
if (r->scrub_flags & PFSTATE_SETPRIO)
|
|
pd.m->m_pkthdr.pf.prio = r->set_prio[0];
|
|
}
|
|
pd.m->m_pkthdr.pf.delay = r->delay;
|
|
}
|
|
}
|
|
|
|
if (action == PF_PASS && qid)
|
|
pd.m->m_pkthdr.pf.qid = qid;
|
|
if (pd.dir == PF_IN && st && st->key[PF_SK_STACK])
|
|
pf_mbuf_link_state_key(pd.m, st->key[PF_SK_STACK]);
|
|
if (pd.dir == PF_OUT && st && st->key[PF_SK_STACK])
|
|
pf_state_key_link_inpcb(st->key[PF_SK_STACK],
|
|
pd.m->m_pkthdr.pf.inp);
|
|
|
|
if (st != NULL && !ISSET(pd.m->m_pkthdr.csum_flags, M_FLOWID)) {
|
|
pd.m->m_pkthdr.ph_flowid = st->key[PF_SK_WIRE]->hash;
|
|
SET(pd.m->m_pkthdr.csum_flags, M_FLOWID);
|
|
}
|
|
|
|
/*
|
|
* connections redirected to loopback should not match sockets
|
|
* bound specifically to loopback due to security implications,
|
|
* see in_pcblookup_listen().
|
|
*/
|
|
if (pd.destchg)
|
|
if ((pd.af == AF_INET && (ntohl(pd.dst->v4.s_addr) >>
|
|
IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) ||
|
|
(pd.af == AF_INET6 && IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)))
|
|
pd.m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
|
|
/* We need to redo the route lookup on outgoing routes. */
|
|
if (pd.destchg && pd.dir == PF_OUT)
|
|
pd.m->m_pkthdr.pf.flags |= PF_TAG_REROUTE;
|
|
|
|
if (pd.dir == PF_IN && action == PF_PASS &&
|
|
(r->divert.type == PF_DIVERT_TO ||
|
|
r->divert.type == PF_DIVERT_REPLY)) {
|
|
struct pf_divert *divert;
|
|
|
|
if ((divert = pf_get_divert(pd.m))) {
|
|
pd.m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED;
|
|
divert->addr = r->divert.addr;
|
|
divert->port = r->divert.port;
|
|
divert->rdomain = pd.rdomain;
|
|
divert->type = r->divert.type;
|
|
}
|
|
}
|
|
|
|
if (action == PF_PASS && r->divert.type == PF_DIVERT_PACKET)
|
|
action = PF_DIVERT;
|
|
|
|
#if NPFLOG > 0
|
|
if (pd.pflog) {
|
|
struct pf_rule_item *ri;
|
|
|
|
if (pd.pflog & PF_LOG_FORCE || r->log & PF_LOG_ALL)
|
|
pflog_packet(&pd, reason, r, a, ruleset, NULL);
|
|
if (st) {
|
|
SLIST_FOREACH(ri, &st->match_rules, entry)
|
|
if (ri->r->log & PF_LOG_ALL)
|
|
pflog_packet(&pd, reason, ri->r, a,
|
|
ruleset, NULL);
|
|
}
|
|
}
|
|
#endif /* NPFLOG > 0 */
|
|
|
|
pf_counters_inc(action, &pd, st, r, a);
|
|
|
|
switch (action) {
|
|
case PF_SYNPROXY_DROP:
|
|
m_freem(pd.m);
|
|
/* FALLTHROUGH */
|
|
case PF_DEFER:
|
|
pd.m = NULL;
|
|
action = PF_PASS;
|
|
break;
|
|
case PF_DIVERT:
|
|
switch (pd.af) {
|
|
case AF_INET:
|
|
divert_packet(pd.m, pd.dir, r->divert.port);
|
|
pd.m = NULL;
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
divert6_packet(pd.m, pd.dir, r->divert.port);
|
|
pd.m = NULL;
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
action = PF_PASS;
|
|
break;
|
|
#ifdef INET6
|
|
case PF_AFRT:
|
|
if (pf_translate_af(&pd)) {
|
|
action = PF_DROP;
|
|
break;
|
|
}
|
|
pd.m->m_pkthdr.pf.flags |= PF_TAG_GENERATED;
|
|
switch (pd.naf) {
|
|
case AF_INET:
|
|
if (pd.dir == PF_IN) {
|
|
if (ipforwarding == 0) {
|
|
ipstat_inc(ips_cantforward);
|
|
action = PF_DROP;
|
|
break;
|
|
}
|
|
ip_forward(pd.m, ifp, NULL, 1);
|
|
} else
|
|
ip_output(pd.m, NULL, NULL, 0, NULL, NULL, 0);
|
|
break;
|
|
case AF_INET6:
|
|
if (pd.dir == PF_IN) {
|
|
if (ip6_forwarding == 0) {
|
|
ip6stat_inc(ip6s_cantforward);
|
|
action = PF_DROP;
|
|
break;
|
|
}
|
|
ip6_forward(pd.m, NULL, 1);
|
|
} else
|
|
ip6_output(pd.m, NULL, NULL, 0, NULL, NULL);
|
|
break;
|
|
}
|
|
if (action != PF_DROP) {
|
|
pd.m = NULL;
|
|
action = PF_PASS;
|
|
}
|
|
break;
|
|
#endif /* INET6 */
|
|
case PF_DROP:
|
|
m_freem(pd.m);
|
|
pd.m = NULL;
|
|
break;
|
|
default:
|
|
if (st && st->rt) {
|
|
switch (pd.af) {
|
|
case AF_INET:
|
|
pf_route(&pd, st);
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
pf_route6(&pd, st);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
#ifdef INET6
|
|
/* if reassembled packet passed, create new fragments */
|
|
if (pf_status.reass && action == PF_PASS && pd.m && fwdir == PF_FWD &&
|
|
pd.af == AF_INET6) {
|
|
struct m_tag *mtag;
|
|
|
|
if ((mtag = m_tag_find(pd.m, PACKET_TAG_PF_REASSEMBLED, NULL)))
|
|
action = pf_refragment6(&pd.m, mtag, NULL, NULL, NULL);
|
|
}
|
|
#endif /* INET6 */
|
|
if (st && action != PF_DROP) {
|
|
if (!st->if_index_in && dir == PF_IN)
|
|
st->if_index_in = ifp->if_index;
|
|
else if (!st->if_index_out && dir == PF_OUT)
|
|
st->if_index_out = ifp->if_index;
|
|
}
|
|
|
|
*m0 = pd.m;
|
|
|
|
pf_state_unref(st);
|
|
|
|
return (action);
|
|
}
|
|
|
|
int
|
|
pf_ouraddr(struct mbuf *m)
|
|
{
|
|
struct pf_state_key *sk;
|
|
|
|
if (m->m_pkthdr.pf.flags & PF_TAG_DIVERTED)
|
|
return (1);
|
|
|
|
sk = m->m_pkthdr.pf.statekey;
|
|
if (sk != NULL) {
|
|
if (READ_ONCE(sk->sk_inp) != NULL)
|
|
return (1);
|
|
}
|
|
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* must be called whenever any addressing information such as
|
|
* address, port, protocol has changed
|
|
*/
|
|
void
|
|
pf_pkt_addr_changed(struct mbuf *m)
|
|
{
|
|
pf_mbuf_unlink_state_key(m);
|
|
pf_mbuf_unlink_inpcb(m);
|
|
}
|
|
|
|
struct inpcb *
|
|
pf_inp_lookup(struct mbuf *m)
|
|
{
|
|
struct inpcb *inp = NULL;
|
|
struct pf_state_key *sk = m->m_pkthdr.pf.statekey;
|
|
|
|
if (!pf_state_key_isvalid(sk))
|
|
pf_mbuf_unlink_state_key(m);
|
|
else if (READ_ONCE(sk->sk_inp) != NULL) {
|
|
mtx_enter(&pf_inp_mtx);
|
|
inp = in_pcbref(sk->sk_inp);
|
|
mtx_leave(&pf_inp_mtx);
|
|
}
|
|
|
|
return (inp);
|
|
}
|
|
|
|
void
|
|
pf_inp_link(struct mbuf *m, struct inpcb *inp)
|
|
{
|
|
struct pf_state_key *sk = m->m_pkthdr.pf.statekey;
|
|
|
|
if (!pf_state_key_isvalid(sk)) {
|
|
pf_mbuf_unlink_state_key(m);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* we don't need to grab PF-lock here. At worst case we link inp to
|
|
* state, which might be just being marked as deleted by another
|
|
* thread.
|
|
*/
|
|
pf_state_key_link_inpcb(sk, inp);
|
|
|
|
/* The statekey has finished finding the inp, it is no longer needed. */
|
|
pf_mbuf_unlink_state_key(m);
|
|
}
|
|
|
|
void
|
|
pf_inp_unlink(struct inpcb *inp)
|
|
{
|
|
struct pf_state_key *sk;
|
|
|
|
if (READ_ONCE(inp->inp_pf_sk) == NULL)
|
|
return;
|
|
|
|
mtx_enter(&pf_inp_mtx);
|
|
sk = inp->inp_pf_sk;
|
|
if (sk == NULL) {
|
|
mtx_leave(&pf_inp_mtx);
|
|
return;
|
|
}
|
|
KASSERT(sk->sk_inp == inp);
|
|
sk->sk_inp = NULL;
|
|
inp->inp_pf_sk = NULL;
|
|
mtx_leave(&pf_inp_mtx);
|
|
|
|
pf_state_key_unref(sk);
|
|
in_pcbunref(inp);
|
|
}
|
|
|
|
void
|
|
pf_state_key_link_reverse(struct pf_state_key *sk, struct pf_state_key *skrev)
|
|
{
|
|
struct pf_state_key *old_reverse;
|
|
|
|
old_reverse = atomic_cas_ptr(&sk->sk_reverse, NULL, skrev);
|
|
if (old_reverse != NULL)
|
|
KASSERT(old_reverse == skrev);
|
|
else {
|
|
pf_state_key_ref(skrev);
|
|
|
|
/*
|
|
* NOTE: if sk == skrev, then KASSERT() below holds true, we
|
|
* still want to grab a reference in such case, because
|
|
* pf_state_key_unlink_reverse() does not check whether keys
|
|
* are identical or not.
|
|
*/
|
|
old_reverse = atomic_cas_ptr(&skrev->sk_reverse, NULL, sk);
|
|
if (old_reverse != NULL)
|
|
KASSERT(old_reverse == sk);
|
|
|
|
pf_state_key_ref(sk);
|
|
}
|
|
}
|
|
|
|
#if NPFLOG > 0
|
|
void
|
|
pf_log_matches(struct pf_pdesc *pd, struct pf_rule *rm, struct pf_rule *am,
|
|
struct pf_ruleset *ruleset, struct pf_rule_slist *matchrules)
|
|
{
|
|
struct pf_rule_item *ri;
|
|
|
|
/* if this is the log(matches) rule, packet has been logged already */
|
|
if (rm->log & PF_LOG_MATCHES)
|
|
return;
|
|
|
|
SLIST_FOREACH(ri, matchrules, entry)
|
|
if (ri->r->log & PF_LOG_MATCHES)
|
|
pflog_packet(pd, PFRES_MATCH, rm, am, ruleset, ri->r);
|
|
}
|
|
#endif /* NPFLOG > 0 */
|
|
|
|
struct pf_state_key *
|
|
pf_state_key_ref(struct pf_state_key *sk)
|
|
{
|
|
if (sk != NULL)
|
|
PF_REF_TAKE(sk->sk_refcnt);
|
|
|
|
return (sk);
|
|
}
|
|
|
|
void
|
|
pf_state_key_unref(struct pf_state_key *sk)
|
|
{
|
|
if (PF_REF_RELE(sk->sk_refcnt)) {
|
|
/* state key must be removed from tree */
|
|
KASSERT(!pf_state_key_isvalid(sk));
|
|
/* state key must be unlinked from reverse key */
|
|
KASSERT(sk->sk_reverse == NULL);
|
|
/* state key must be unlinked from socket */
|
|
KASSERT(sk->sk_inp == NULL);
|
|
pool_put(&pf_state_key_pl, sk);
|
|
}
|
|
}
|
|
|
|
int
|
|
pf_state_key_isvalid(struct pf_state_key *sk)
|
|
{
|
|
return ((sk != NULL) && (sk->sk_removed == 0));
|
|
}
|
|
|
|
void
|
|
pf_mbuf_link_state_key(struct mbuf *m, struct pf_state_key *sk)
|
|
{
|
|
KASSERT(m->m_pkthdr.pf.statekey == NULL);
|
|
m->m_pkthdr.pf.statekey = pf_state_key_ref(sk);
|
|
}
|
|
|
|
void
|
|
pf_mbuf_unlink_state_key(struct mbuf *m)
|
|
{
|
|
struct pf_state_key *sk = m->m_pkthdr.pf.statekey;
|
|
|
|
if (sk != NULL) {
|
|
m->m_pkthdr.pf.statekey = NULL;
|
|
pf_state_key_unref(sk);
|
|
}
|
|
}
|
|
|
|
void
|
|
pf_mbuf_link_inpcb(struct mbuf *m, struct inpcb *inp)
|
|
{
|
|
KASSERT(m->m_pkthdr.pf.inp == NULL);
|
|
m->m_pkthdr.pf.inp = in_pcbref(inp);
|
|
}
|
|
|
|
void
|
|
pf_mbuf_unlink_inpcb(struct mbuf *m)
|
|
{
|
|
struct inpcb *inp = m->m_pkthdr.pf.inp;
|
|
|
|
if (inp != NULL) {
|
|
m->m_pkthdr.pf.inp = NULL;
|
|
in_pcbunref(inp);
|
|
}
|
|
}
|
|
|
|
void
|
|
pf_state_key_link_inpcb(struct pf_state_key *sk, struct inpcb *inp)
|
|
{
|
|
if (inp == NULL || READ_ONCE(sk->sk_inp) != NULL)
|
|
return;
|
|
|
|
mtx_enter(&pf_inp_mtx);
|
|
if (inp->inp_pf_sk != NULL || sk->sk_inp != NULL) {
|
|
mtx_leave(&pf_inp_mtx);
|
|
return;
|
|
}
|
|
sk->sk_inp = in_pcbref(inp);
|
|
inp->inp_pf_sk = pf_state_key_ref(sk);
|
|
mtx_leave(&pf_inp_mtx);
|
|
}
|
|
|
|
void
|
|
pf_state_key_unlink_inpcb(struct pf_state_key *sk)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
if (READ_ONCE(sk->sk_inp) == NULL)
|
|
return;
|
|
|
|
mtx_enter(&pf_inp_mtx);
|
|
inp = sk->sk_inp;
|
|
if (inp == NULL) {
|
|
mtx_leave(&pf_inp_mtx);
|
|
return;
|
|
}
|
|
KASSERT(inp->inp_pf_sk == sk);
|
|
sk->sk_inp = NULL;
|
|
inp->inp_pf_sk = NULL;
|
|
mtx_leave(&pf_inp_mtx);
|
|
|
|
pf_state_key_unref(sk);
|
|
in_pcbunref(inp);
|
|
}
|
|
|
|
void
|
|
pf_state_key_unlink_reverse(struct pf_state_key *sk)
|
|
{
|
|
struct pf_state_key *skrev = sk->sk_reverse;
|
|
|
|
/* Note that sk and skrev may be equal, then we unref twice. */
|
|
if (skrev != NULL) {
|
|
KASSERT(skrev->sk_reverse == sk);
|
|
sk->sk_reverse = NULL;
|
|
skrev->sk_reverse = NULL;
|
|
pf_state_key_unref(skrev);
|
|
pf_state_key_unref(sk);
|
|
}
|
|
}
|
|
|
|
struct pf_state *
|
|
pf_state_ref(struct pf_state *st)
|
|
{
|
|
if (st != NULL)
|
|
PF_REF_TAKE(st->refcnt);
|
|
return (st);
|
|
}
|
|
|
|
void
|
|
pf_state_unref(struct pf_state *st)
|
|
{
|
|
if ((st != NULL) && PF_REF_RELE(st->refcnt)) {
|
|
/* never inserted or removed */
|
|
#if NPFSYNC > 0
|
|
KASSERT((TAILQ_NEXT(st, sync_list) == NULL) ||
|
|
((TAILQ_NEXT(st, sync_list) == _Q_INVALID) &&
|
|
(st->sync_state >= PFSYNC_S_NONE)));
|
|
#endif /* NPFSYNC */
|
|
KASSERT((TAILQ_NEXT(st, entry_list) == NULL) ||
|
|
(TAILQ_NEXT(st, entry_list) == _Q_INVALID));
|
|
|
|
pf_state_key_unref(st->key[PF_SK_WIRE]);
|
|
pf_state_key_unref(st->key[PF_SK_STACK]);
|
|
|
|
pool_put(&pf_state_pl, st);
|
|
}
|
|
}
|
|
|
|
int
|
|
pf_delay_pkt(struct mbuf *m, u_int ifidx)
|
|
{
|
|
struct pf_pktdelay *pdy;
|
|
|
|
if ((pdy = pool_get(&pf_pktdelay_pl, PR_NOWAIT)) == NULL) {
|
|
m_freem(m);
|
|
return (ENOBUFS);
|
|
}
|
|
pdy->ifidx = ifidx;
|
|
pdy->m = m;
|
|
timeout_set(&pdy->to, pf_pktenqueue_delayed, pdy);
|
|
timeout_add_msec(&pdy->to, m->m_pkthdr.pf.delay);
|
|
m->m_pkthdr.pf.delay = 0;
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
pf_pktenqueue_delayed(void *arg)
|
|
{
|
|
struct pf_pktdelay *pdy = arg;
|
|
struct ifnet *ifp;
|
|
|
|
ifp = if_get(pdy->ifidx);
|
|
if (ifp != NULL) {
|
|
if_enqueue(ifp, pdy->m);
|
|
if_put(ifp);
|
|
} else
|
|
m_freem(pdy->m);
|
|
|
|
pool_put(&pf_pktdelay_pl, pdy);
|
|
}
|