1356 lines
36 KiB
C
1356 lines
36 KiB
C
/* $OpenBSD: nd6_nbr.c,v 1.151 2023/07/30 12:52:03 krw Exp $ */
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/* $KAME: nd6_nbr.c,v 1.61 2001/02/10 16:06:14 jinmei Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/ioctl.h>
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#include <sys/syslog.h>
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#include <sys/queue.h>
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#include <sys/timeout.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/if_dl.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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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 <netinet6/nd6.h>
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#include <netinet/icmp6.h>
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#include "carp.h"
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#if NCARP > 0
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#include <netinet/ip_carp.h>
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#endif
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static TAILQ_HEAD(, dadq) dadq =
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TAILQ_HEAD_INITIALIZER(dadq); /* list of addresses to run DAD on */
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struct dadq {
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TAILQ_ENTRY(dadq) dad_list;
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struct ifaddr *dad_ifa;
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int dad_count; /* max NS to send */
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int dad_ns_tcount; /* # of trials to send NS */
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int dad_ns_ocount; /* NS sent so far */
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int dad_ns_icount;
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int dad_na_icount;
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struct timeout dad_timer_ch;
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};
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struct dadq *nd6_dad_find(struct ifaddr *);
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void nd6_dad_destroy(struct dadq *);
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void nd6_dad_starttimer(struct dadq *);
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void nd6_dad_stoptimer(struct dadq *);
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void nd6_dad_timer(void *);
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void nd6_dad_ns_output(struct dadq *, struct ifaddr *);
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void nd6_dad_ns_input(struct ifaddr *);
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void nd6_dad_duplicated(struct dadq *);
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int nd6_isneighbor(const struct ifnet *, const struct in6_addr *);
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static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */
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/*
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* Input an Neighbor Solicitation Message.
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*
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* Based on RFC 2461
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* Based on RFC 2462 (duplicated address detection)
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*/
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void
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nd6_ns_input(struct mbuf *m, int off, int icmp6len)
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{
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struct ifnet *ifp;
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struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
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struct nd_neighbor_solicit *nd_ns;
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struct in6_addr saddr6 = ip6->ip6_src;
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struct in6_addr daddr6 = ip6->ip6_dst;
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struct in6_addr taddr6;
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struct in6_addr myaddr6;
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char *lladdr = NULL;
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struct ifaddr *ifa = NULL;
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int lladdrlen = 0;
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int anycast = 0, proxy = 0, tentative = 0;
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int router = ip6_forwarding;
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int tlladdr;
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struct nd_opts ndopts;
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struct sockaddr_dl *proxydl = NULL;
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char addr[INET6_ADDRSTRLEN], addr0[INET6_ADDRSTRLEN];
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ifp = if_get(m->m_pkthdr.ph_ifidx);
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if (ifp == NULL)
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goto freeit;
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IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
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if (nd_ns == NULL) {
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icmp6stat_inc(icp6s_tooshort);
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if_put(ifp);
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return;
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}
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ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */
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taddr6 = nd_ns->nd_ns_target;
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if (ip6->ip6_hlim != 255) {
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nd6log((LOG_ERR,
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"nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
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ip6->ip6_hlim,
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inet_ntop(AF_INET6, &ip6->ip6_src, addr, sizeof(addr)),
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inet_ntop(AF_INET6, &ip6->ip6_dst, addr0, sizeof(addr0)),
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ifp->if_xname));
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goto bad;
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}
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if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
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/* dst has to be solicited node multicast address. */
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/* don't check ifindex portion */
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if (daddr6.s6_addr16[0] == __IPV6_ADDR_INT16_MLL &&
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daddr6.s6_addr32[1] == 0 &&
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daddr6.s6_addr32[2] == __IPV6_ADDR_INT32_ONE &&
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daddr6.s6_addr8[12] == 0xff) {
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; /*good*/
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} else {
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nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
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"(wrong ip6 dst)\n"));
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goto bad;
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}
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} else {
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/*
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* Make sure the source address is from a neighbor's address.
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*/
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if (!nd6_isneighbor(ifp, &saddr6)) {
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nd6log((LOG_INFO, "nd6_ns_input: "
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"NS packet from non-neighbor\n"));
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goto bad;
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}
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}
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if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
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nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
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goto bad;
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}
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if (IN6_IS_SCOPE_EMBED(&taddr6))
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taddr6.s6_addr16[1] = htons(ifp->if_index);
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icmp6len -= sizeof(*nd_ns);
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if (nd6_options(nd_ns + 1, icmp6len, &ndopts) < 0) {
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nd6log((LOG_INFO,
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"nd6_ns_input: invalid ND option, ignored\n"));
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/* nd6_options have incremented stats */
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goto freeit;
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}
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if (ndopts.nd_opts_src_lladdr) {
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lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
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lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
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}
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if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
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nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
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"(link-layer address option)\n"));
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goto bad;
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}
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/*
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* Attaching target link-layer address to the NA?
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* (RFC 2461 7.2.4)
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*
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* NS IP dst is unicast/anycast MUST NOT add
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* NS IP dst is solicited-node multicast MUST add
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*
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* In implementation, we add target link-layer address by default.
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* We do not add one in MUST NOT cases.
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*/
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#if 0 /* too much! */
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ifa = &in6ifa_ifpwithaddr(ifp, &daddr6)->ia_ifa;
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if (ifa && (ifatoia6(ifa)->ia6_flags & IN6_IFF_ANYCAST))
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tlladdr = 0;
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else
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#endif
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if (!IN6_IS_ADDR_MULTICAST(&daddr6))
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tlladdr = 0;
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else
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tlladdr = 1;
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/*
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* Target address (taddr6) must be either:
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* (1) Valid unicast/anycast address for my receiving interface,
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* (2) Unicast address for which I'm offering proxy service, or
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* (3) "tentative" address on which DAD is being performed.
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*/
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/* (1) and (3) check. */
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ifa = &in6ifa_ifpwithaddr(ifp, &taddr6)->ia_ifa;
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#if NCARP > 0
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if (ifp->if_type == IFT_CARP && ifa && !carp_iamatch(ifp))
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ifa = NULL;
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#endif
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/* (2) check. */
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if (!ifa) {
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struct rtentry *rt;
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struct sockaddr_in6 tsin6;
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bzero(&tsin6, sizeof tsin6);
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tsin6.sin6_len = sizeof(struct sockaddr_in6);
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tsin6.sin6_family = AF_INET6;
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tsin6.sin6_addr = taddr6;
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rt = rtalloc(sin6tosa(&tsin6), 0, m->m_pkthdr.ph_rtableid);
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if (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 &&
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rt->rt_gateway->sa_family == AF_LINK) {
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/*
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* proxy NDP for single entry
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*/
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ifa = &in6ifa_ifpforlinklocal(ifp, IN6_IFF_TENTATIVE|
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IN6_IFF_DUPLICATED|IN6_IFF_ANYCAST)->ia_ifa;
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if (ifa) {
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proxy = 1;
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proxydl = satosdl(rt->rt_gateway);
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router = 0; /* XXX */
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}
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}
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if (rt)
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rtfree(rt);
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}
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if (!ifa) {
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/*
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* We've got an NS packet, and we don't have that address
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* assigned for us. We MUST silently ignore it.
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* See RFC2461 7.2.3.
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*/
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goto freeit;
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}
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myaddr6 = *IFA_IN6(ifa);
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anycast = ifatoia6(ifa)->ia6_flags & IN6_IFF_ANYCAST;
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tentative = ifatoia6(ifa)->ia6_flags & IN6_IFF_TENTATIVE;
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if (ifatoia6(ifa)->ia6_flags & IN6_IFF_DUPLICATED)
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goto freeit;
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if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
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nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
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"(if %d, NS packet %d)\n",
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inet_ntop(AF_INET6, &taddr6, addr, sizeof(addr)),
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ifp->if_addrlen, lladdrlen - 2));
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goto bad;
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}
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if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
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log(LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
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inet_ntop(AF_INET6, &saddr6, addr, sizeof(addr)));
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goto freeit;
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}
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/*
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* We have neighbor solicitation packet, with target address equals to
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* one of my tentative address.
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*
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* src addr how to process?
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* --- ---
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* multicast of course, invalid (rejected in ip6_input)
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* unicast somebody is doing address resolution -> ignore
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* unspec dup address detection
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*
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* The processing is defined in RFC 2462.
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*/
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if (tentative) {
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/*
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* If source address is unspecified address, it is for
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* duplicated address detection.
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*
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* If not, the packet is for address resolution;
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* silently ignore it.
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*/
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if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
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nd6_dad_ns_input(ifa);
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goto freeit;
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}
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/*
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* If the source address is unspecified address, entries must not
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* be created or updated.
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* It looks that sender is performing DAD. Output NA toward
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* all-node multicast address, to tell the sender that I'm using
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* the address.
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* S bit ("solicited") must be zero.
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*/
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if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
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saddr6 = in6addr_linklocal_allnodes;
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saddr6.s6_addr16[1] = htons(ifp->if_index);
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nd6_na_output(ifp, &saddr6, &taddr6,
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((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
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(router ? ND_NA_FLAG_ROUTER : 0),
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tlladdr, sdltosa(proxydl));
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goto freeit;
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}
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nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT,
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0);
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nd6_na_output(ifp, &saddr6, &taddr6,
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((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
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(router ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED,
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tlladdr, sdltosa(proxydl));
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freeit:
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m_freem(m);
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if_put(ifp);
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return;
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bad:
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nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
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inet_ntop(AF_INET6, &saddr6, addr, sizeof(addr))));
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nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
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inet_ntop(AF_INET6, &daddr6, addr, sizeof(addr))));
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nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
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inet_ntop(AF_INET6, &taddr6, addr, sizeof(addr))));
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icmp6stat_inc(icp6s_badns);
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m_freem(m);
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if_put(ifp);
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}
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/*
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* Output an Neighbor Solicitation Message. Caller specifies:
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* - ICMP6 header source IP6 address
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* - ND6 header target IP6 address
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* - ND6 header source datalink address
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*
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* Based on RFC 2461
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* Based on RFC 2462 (duplicated address detection)
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*
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* ln - for source address determination
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* dad - duplicated address detection
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*/
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void
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nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6,
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const struct in6_addr *taddr6, const struct in6_addr *saddr6, int dad)
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{
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struct mbuf *m;
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struct ip6_hdr *ip6;
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struct nd_neighbor_solicit *nd_ns;
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struct sockaddr_in6 src_sa, dst_sa;
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struct ip6_moptions im6o;
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int icmp6len;
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int maxlen;
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caddr_t mac;
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if (IN6_IS_ADDR_MULTICAST(taddr6))
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return;
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/* estimate the size of message */
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maxlen = sizeof(*ip6) + sizeof(*nd_ns);
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maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
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#ifdef DIAGNOSTIC
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if (max_linkhdr + maxlen >= MCLBYTES) {
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printf("%s: max_linkhdr + maxlen >= MCLBYTES (%d + %d > %d)\n",
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__func__, max_linkhdr, maxlen, MCLBYTES);
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panic("%s: insufficient MCLBYTES", __func__);
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/* NOTREACHED */
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}
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#endif
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MGETHDR(m, M_DONTWAIT, MT_DATA);
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if (m && max_linkhdr + maxlen >= MHLEN) {
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MCLGET(m, M_DONTWAIT);
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if ((m->m_flags & M_EXT) == 0) {
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m_free(m);
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m = NULL;
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}
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}
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if (m == NULL)
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return;
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m->m_pkthdr.ph_ifidx = 0;
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m->m_pkthdr.ph_rtableid = ifp->if_rdomain;
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if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
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m->m_flags |= M_MCAST;
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im6o.im6o_ifidx = ifp->if_index;
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im6o.im6o_hlim = 255;
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im6o.im6o_loop = 0;
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}
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icmp6len = sizeof(*nd_ns);
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m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
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m_align(m, maxlen);
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|
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/* fill neighbor solicitation packet */
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ip6 = mtod(m, struct ip6_hdr *);
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ip6->ip6_flow = 0;
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ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
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ip6->ip6_vfc |= IPV6_VERSION;
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/* ip6->ip6_plen will be set later */
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ip6->ip6_nxt = IPPROTO_ICMPV6;
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ip6->ip6_hlim = 255;
|
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/* determine the source and destination addresses */
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bzero(&src_sa, sizeof(src_sa));
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bzero(&dst_sa, sizeof(dst_sa));
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src_sa.sin6_family = dst_sa.sin6_family = AF_INET6;
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src_sa.sin6_len = dst_sa.sin6_len = sizeof(struct sockaddr_in6);
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if (daddr6 != NULL)
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dst_sa.sin6_addr = *daddr6;
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else {
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dst_sa.sin6_addr.s6_addr16[0] = __IPV6_ADDR_INT16_MLL;
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dst_sa.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
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dst_sa.sin6_addr.s6_addr32[1] = 0;
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dst_sa.sin6_addr.s6_addr32[2] = __IPV6_ADDR_INT32_ONE;
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dst_sa.sin6_addr.s6_addr32[3] = taddr6->s6_addr32[3];
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dst_sa.sin6_addr.s6_addr8[12] = 0xff;
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}
|
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ip6->ip6_dst = dst_sa.sin6_addr;
|
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if (!dad) {
|
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/*
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|
* RFC2461 7.2.2:
|
|
* "If the source address of the packet prompting the
|
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* solicitation is the same as one of the addresses assigned
|
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* to the outgoing interface, that address SHOULD be placed
|
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* in the IP Source Address of the outgoing solicitation.
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* Otherwise, any one of the addresses assigned to the
|
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* interface should be used."
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*
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* We use the source address for the prompting packet
|
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* (saddr6), if:
|
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* - saddr6 is given from the caller (by giving "ln"), and
|
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* - saddr6 belongs to the outgoing interface and
|
|
* - if taddr is link local saddr6 must be link local as well
|
|
* Otherwise, we perform the source address selection as usual.
|
|
*/
|
|
if (saddr6 != NULL)
|
|
src_sa.sin6_addr = *saddr6;
|
|
|
|
if (!IN6_IS_ADDR_LINKLOCAL(taddr6) ||
|
|
IN6_IS_ADDR_UNSPECIFIED(&src_sa.sin6_addr) ||
|
|
IN6_IS_ADDR_LINKLOCAL(&src_sa.sin6_addr) ||
|
|
!in6ifa_ifpwithaddr(ifp, &src_sa.sin6_addr)) {
|
|
struct rtentry *rt;
|
|
|
|
rt = rtalloc(sin6tosa(&dst_sa), RT_RESOLVE,
|
|
m->m_pkthdr.ph_rtableid);
|
|
if (!rtisvalid(rt)) {
|
|
char addr[INET6_ADDRSTRLEN];
|
|
|
|
nd6log((LOG_DEBUG,
|
|
"%s: source can't be determined: dst=%s\n",
|
|
__func__, inet_ntop(AF_INET6,
|
|
&dst_sa.sin6_addr, addr, sizeof(addr))));
|
|
rtfree(rt);
|
|
goto bad;
|
|
}
|
|
src_sa.sin6_addr =
|
|
ifatoia6(rt->rt_ifa)->ia_addr.sin6_addr;
|
|
rtfree(rt);
|
|
}
|
|
} else {
|
|
/*
|
|
* Source address for DAD packet must always be IPv6
|
|
* unspecified address. (0::0)
|
|
* We actually don't have to 0-clear the address (we did it
|
|
* above), but we do so here explicitly to make the intention
|
|
* clearer.
|
|
*/
|
|
bzero(&src_sa.sin6_addr, sizeof(src_sa.sin6_addr));
|
|
}
|
|
ip6->ip6_src = src_sa.sin6_addr;
|
|
nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
|
|
nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
|
|
nd_ns->nd_ns_code = 0;
|
|
nd_ns->nd_ns_reserved = 0;
|
|
nd_ns->nd_ns_target = *taddr6;
|
|
|
|
if (IN6_IS_SCOPE_EMBED(&nd_ns->nd_ns_target))
|
|
nd_ns->nd_ns_target.s6_addr16[1] = 0;
|
|
|
|
/*
|
|
* Add source link-layer address option.
|
|
*
|
|
* spec implementation
|
|
* --- ---
|
|
* DAD packet MUST NOT do not add the option
|
|
* there's no link layer address:
|
|
* impossible do not add the option
|
|
* there's link layer address:
|
|
* Multicast NS MUST add one add the option
|
|
* Unicast NS SHOULD add one add the option
|
|
*/
|
|
if (!dad && (mac = nd6_ifptomac(ifp))) {
|
|
int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
|
|
struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
|
|
/* 8 byte alignments... */
|
|
optlen = (optlen + 7) & ~7;
|
|
|
|
m->m_pkthdr.len += optlen;
|
|
m->m_len += optlen;
|
|
icmp6len += optlen;
|
|
bzero((caddr_t)nd_opt, optlen);
|
|
nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
|
|
nd_opt->nd_opt_len = optlen >> 3;
|
|
bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
|
|
}
|
|
|
|
ip6->ip6_plen = htons((u_short)icmp6len);
|
|
nd_ns->nd_ns_cksum = 0;
|
|
m->m_pkthdr.csum_flags |= M_ICMP_CSUM_OUT;
|
|
|
|
ip6_output(m, NULL, NULL, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL);
|
|
icmp6stat_inc(icp6s_outhist + ND_NEIGHBOR_SOLICIT);
|
|
return;
|
|
|
|
bad:
|
|
m_freem(m);
|
|
}
|
|
|
|
/*
|
|
* Neighbor advertisement input handling.
|
|
*
|
|
* Based on RFC 2461
|
|
* Based on RFC 2462 (duplicated address detection)
|
|
*
|
|
* the following items are not implemented yet:
|
|
* - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
|
|
* - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
|
|
*/
|
|
void
|
|
nd6_na_input(struct mbuf *m, int off, int icmp6len)
|
|
{
|
|
struct ifnet *ifp;
|
|
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
|
|
struct nd_neighbor_advert *nd_na;
|
|
struct in6_addr daddr6 = ip6->ip6_dst;
|
|
struct in6_addr taddr6;
|
|
int flags;
|
|
int is_router;
|
|
int is_solicited;
|
|
int is_override;
|
|
char *lladdr = NULL;
|
|
int lladdrlen = 0;
|
|
struct ifaddr *ifa;
|
|
struct in6_ifaddr *ifa6;
|
|
struct llinfo_nd6 *ln;
|
|
struct rtentry *rt = NULL;
|
|
struct sockaddr_dl *sdl;
|
|
struct nd_opts ndopts;
|
|
char addr[INET6_ADDRSTRLEN], addr0[INET6_ADDRSTRLEN];
|
|
|
|
NET_ASSERT_LOCKED_EXCLUSIVE();
|
|
|
|
ifp = if_get(m->m_pkthdr.ph_ifidx);
|
|
if (ifp == NULL)
|
|
goto freeit;
|
|
|
|
if (ip6->ip6_hlim != 255) {
|
|
nd6log((LOG_ERR,
|
|
"nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
|
|
ip6->ip6_hlim,
|
|
inet_ntop(AF_INET6, &ip6->ip6_src, addr, sizeof(addr)),
|
|
inet_ntop(AF_INET6, &ip6->ip6_dst, addr0, sizeof(addr0)),
|
|
ifp->if_xname));
|
|
goto bad;
|
|
}
|
|
|
|
IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
|
|
if (nd_na == NULL) {
|
|
icmp6stat_inc(icp6s_tooshort);
|
|
if_put(ifp);
|
|
return;
|
|
}
|
|
taddr6 = nd_na->nd_na_target;
|
|
flags = nd_na->nd_na_flags_reserved;
|
|
is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
|
|
is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
|
|
is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
|
|
|
|
if (IN6_IS_SCOPE_EMBED(&taddr6))
|
|
taddr6.s6_addr16[1] = htons(ifp->if_index);
|
|
|
|
if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
|
|
nd6log((LOG_ERR,
|
|
"nd6_na_input: invalid target address %s\n",
|
|
inet_ntop(AF_INET6, &taddr6, addr, sizeof(addr))));
|
|
goto bad;
|
|
}
|
|
if (is_solicited && IN6_IS_ADDR_MULTICAST(&daddr6)) {
|
|
nd6log((LOG_ERR,
|
|
"nd6_na_input: a solicited adv is multicasted\n"));
|
|
goto bad;
|
|
}
|
|
|
|
icmp6len -= sizeof(*nd_na);
|
|
if (nd6_options(nd_na + 1, icmp6len, &ndopts) < 0) {
|
|
nd6log((LOG_INFO,
|
|
"nd6_na_input: invalid ND option, ignored\n"));
|
|
/* nd6_options have incremented stats */
|
|
goto freeit;
|
|
}
|
|
|
|
if (IN6_IS_ADDR_MULTICAST(&daddr6) && !ndopts.nd_opts_tgt_lladdr) {
|
|
nd6log((LOG_INFO,
|
|
"nd6_na_input: multicast adv without TLLA\n"));
|
|
goto bad;
|
|
}
|
|
|
|
if (ndopts.nd_opts_tgt_lladdr) {
|
|
lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
|
|
lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
|
|
}
|
|
|
|
ifa6 = in6ifa_ifpwithaddr(ifp, &taddr6);
|
|
ifa = ifa6 ? &ifa6->ia_ifa : NULL;
|
|
|
|
/*
|
|
* Target address matches one of my interface address.
|
|
*
|
|
* If my address is tentative, this means that there's somebody
|
|
* already using the same address as mine. This indicates DAD failure.
|
|
* This is defined in RFC 2462.
|
|
*
|
|
* Otherwise, process as defined in RFC 2461.
|
|
*/
|
|
if (ifa && (ifatoia6(ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
|
|
struct dadq *dp;
|
|
|
|
dp = nd6_dad_find(ifa);
|
|
if (dp) {
|
|
dp->dad_na_icount++;
|
|
|
|
/* remove the address. */
|
|
nd6_dad_duplicated(dp);
|
|
}
|
|
goto freeit;
|
|
}
|
|
|
|
if (ifa) {
|
|
#if NCARP > 0
|
|
/*
|
|
* Ignore NAs silently for carp addresses if we're not
|
|
* the CARP master.
|
|
*/
|
|
if (ifp->if_type == IFT_CARP && !carp_iamatch(ifp))
|
|
goto freeit;
|
|
#endif
|
|
log(LOG_ERR,
|
|
"nd6_na_input: duplicate IP6 address %s\n",
|
|
inet_ntop(AF_INET6, &taddr6, addr, sizeof(addr)));
|
|
goto freeit;
|
|
}
|
|
|
|
if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
|
|
nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
|
|
"(if %d, NA packet %d)\n",
|
|
inet_ntop(AF_INET6, &taddr6, addr, sizeof(addr)),
|
|
ifp->if_addrlen, lladdrlen - 2));
|
|
goto bad;
|
|
}
|
|
|
|
/* Check if we already have this neighbor in our cache. */
|
|
rt = nd6_lookup(&taddr6, 0, ifp, ifp->if_rdomain);
|
|
|
|
/*
|
|
* If we are a router, we may create new stale cache entries upon
|
|
* receiving Unsolicited Neighbor Advertisements.
|
|
*/
|
|
if (rt == NULL && ip6_forwarding == 1) {
|
|
rt = nd6_lookup(&taddr6, 1, ifp, ifp->if_rdomain);
|
|
if (rt == NULL || lladdr == NULL ||
|
|
((sdl = satosdl(rt->rt_gateway)) == NULL))
|
|
goto freeit;
|
|
|
|
ln = (struct llinfo_nd6 *)rt->rt_llinfo;
|
|
sdl->sdl_alen = ifp->if_addrlen;
|
|
bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
|
|
|
|
/*
|
|
* RFC9131 6.1.1
|
|
*
|
|
* Routers SHOULD create a new entry for the target address
|
|
* with the reachability state set to STALE.
|
|
*/
|
|
ln->ln_state = ND6_LLINFO_STALE;
|
|
nd6_llinfo_settimer(ln, nd6_gctimer);
|
|
|
|
goto freeit;
|
|
}
|
|
|
|
/*
|
|
* Host:
|
|
* If no neighbor cache entry is found, NA SHOULD silently be
|
|
* discarded.
|
|
*/
|
|
if ((rt == NULL) ||
|
|
((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) ||
|
|
((sdl = satosdl(rt->rt_gateway)) == NULL))
|
|
goto freeit;
|
|
|
|
if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
|
|
/*
|
|
* If the link-layer has address, and no lladdr option came,
|
|
* discard the packet.
|
|
*/
|
|
if (ifp->if_addrlen && !lladdr)
|
|
goto freeit;
|
|
|
|
/*
|
|
* Record link-layer address, and update the state.
|
|
*/
|
|
sdl->sdl_alen = ifp->if_addrlen;
|
|
bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
|
|
if (is_solicited) {
|
|
ln->ln_state = ND6_LLINFO_REACHABLE;
|
|
ln->ln_byhint = 0;
|
|
/* Notify userland that a new ND entry is reachable. */
|
|
rtm_send(rt, RTM_RESOLVE, 0, ifp->if_rdomain);
|
|
if (!ND6_LLINFO_PERMANENT(ln)) {
|
|
nd6_llinfo_settimer(ln,
|
|
ifp->if_nd->reachable);
|
|
}
|
|
} else {
|
|
ln->ln_state = ND6_LLINFO_STALE;
|
|
nd6_llinfo_settimer(ln, nd6_gctimer);
|
|
}
|
|
if ((ln->ln_router = is_router) != 0) {
|
|
/*
|
|
* This means a router's state has changed from
|
|
* non-reachable to probably reachable, and might
|
|
* affect the status of associated prefixes..
|
|
*/
|
|
if ((rt->rt_flags & RTF_LLINFO) == 0)
|
|
goto freeit; /* ln is gone */
|
|
}
|
|
} else {
|
|
int llchange;
|
|
|
|
/*
|
|
* Check if the link-layer address has changed or not.
|
|
*/
|
|
if (!lladdr)
|
|
llchange = 0;
|
|
else {
|
|
if (sdl->sdl_alen) {
|
|
if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen))
|
|
llchange = 1;
|
|
else
|
|
llchange = 0;
|
|
} else
|
|
llchange = 1;
|
|
}
|
|
|
|
/*
|
|
* This is VERY complex. Look at it with care.
|
|
*
|
|
* override solicit lladdr llchange action
|
|
* (L: record lladdr)
|
|
*
|
|
* 0 0 n -- (2c)
|
|
* 0 0 y n (2b) L
|
|
* 0 0 y y (1) REACHABLE->STALE
|
|
* 0 1 n -- (2c) *->REACHABLE
|
|
* 0 1 y n (2b) L *->REACHABLE
|
|
* 0 1 y y (1) REACHABLE->STALE
|
|
* 1 0 n -- (2a)
|
|
* 1 0 y n (2a) L
|
|
* 1 0 y y (2a) L *->STALE
|
|
* 1 1 n -- (2a) *->REACHABLE
|
|
* 1 1 y n (2a) L *->REACHABLE
|
|
* 1 1 y y (2a) L *->REACHABLE
|
|
*/
|
|
if (!is_override && (lladdr && llchange)) { /* (1) */
|
|
/*
|
|
* If state is REACHABLE, make it STALE.
|
|
* no other updates should be done.
|
|
*/
|
|
if (ln->ln_state == ND6_LLINFO_REACHABLE) {
|
|
ln->ln_state = ND6_LLINFO_STALE;
|
|
nd6_llinfo_settimer(ln, nd6_gctimer);
|
|
}
|
|
goto freeit;
|
|
} else if (is_override /* (2a) */
|
|
|| (!is_override && (lladdr && !llchange)) /* (2b) */
|
|
|| !lladdr) { /* (2c) */
|
|
/*
|
|
* Update link-local address, if any.
|
|
*/
|
|
if (llchange) {
|
|
log(LOG_INFO, "ndp info overwritten for %s "
|
|
"by %s on %s\n",
|
|
inet_ntop(AF_INET6, &taddr6,
|
|
addr, sizeof(addr)),
|
|
ether_sprintf(lladdr), ifp->if_xname);
|
|
}
|
|
if (lladdr) {
|
|
sdl->sdl_alen = ifp->if_addrlen;
|
|
bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
|
|
}
|
|
|
|
/*
|
|
* If solicited, make the state REACHABLE.
|
|
* If not solicited and the link-layer address was
|
|
* changed, make it STALE.
|
|
*/
|
|
if (is_solicited) {
|
|
ln->ln_state = ND6_LLINFO_REACHABLE;
|
|
ln->ln_byhint = 0;
|
|
if (!ND6_LLINFO_PERMANENT(ln)) {
|
|
nd6_llinfo_settimer(ln,
|
|
ifp->if_nd->reachable);
|
|
}
|
|
} else {
|
|
if (lladdr && llchange) {
|
|
ln->ln_state = ND6_LLINFO_STALE;
|
|
nd6_llinfo_settimer(ln, nd6_gctimer);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (ln->ln_router && !is_router) {
|
|
if (!ip6_forwarding) {
|
|
/*
|
|
* The neighbor may be used
|
|
* as a next hop for some destinations
|
|
* (e.g. redirect case). So we must
|
|
* call rt6_flush explicitly.
|
|
*/
|
|
rt6_flush(&ip6->ip6_src, ifp);
|
|
}
|
|
}
|
|
ln->ln_router = is_router;
|
|
}
|
|
rt->rt_flags &= ~RTF_REJECT;
|
|
ln->ln_asked = 0;
|
|
if_output_mq(ifp, &ln->ln_mq, &ln_hold_total, rt_key(rt), rt);
|
|
|
|
freeit:
|
|
rtfree(rt);
|
|
m_freem(m);
|
|
if_put(ifp);
|
|
return;
|
|
|
|
bad:
|
|
icmp6stat_inc(icp6s_badna);
|
|
m_freem(m);
|
|
if_put(ifp);
|
|
}
|
|
|
|
/*
|
|
* Neighbor advertisement output handling.
|
|
*
|
|
* Based on RFC 2461
|
|
*
|
|
* the following items are not implemented yet:
|
|
* - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
|
|
* - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
|
|
*
|
|
* tlladdr - 1 if include target link-layer address
|
|
* sdl0 - sockaddr_dl (= proxy NA) or NULL
|
|
*/
|
|
void
|
|
nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6,
|
|
const struct in6_addr *taddr6, u_long flags, int tlladdr,
|
|
struct sockaddr *sdl0)
|
|
{
|
|
struct mbuf *m;
|
|
struct rtentry *rt = NULL;
|
|
struct ip6_hdr *ip6;
|
|
struct nd_neighbor_advert *nd_na;
|
|
struct ip6_moptions im6o;
|
|
struct sockaddr_in6 dst_sa;
|
|
int icmp6len, maxlen;
|
|
caddr_t mac = NULL;
|
|
|
|
#if NCARP > 0
|
|
/* Do not send NAs for carp addresses if we're not the CARP master. */
|
|
if (ifp->if_type == IFT_CARP && !carp_iamatch(ifp))
|
|
return;
|
|
#endif
|
|
|
|
/* estimate the size of message */
|
|
maxlen = sizeof(*ip6) + sizeof(*nd_na);
|
|
maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
|
|
#ifdef DIAGNOSTIC
|
|
if (max_linkhdr + maxlen >= MCLBYTES) {
|
|
printf("%s: max_linkhdr + maxlen >= MCLBYTES (%d + %d > %d)\n",
|
|
__func__, max_linkhdr, maxlen, MCLBYTES);
|
|
panic("%s: insufficient MCLBYTES", __func__);
|
|
/* NOTREACHED */
|
|
}
|
|
#endif
|
|
|
|
MGETHDR(m, M_DONTWAIT, MT_DATA);
|
|
if (m && max_linkhdr + maxlen >= MHLEN) {
|
|
MCLGET(m, M_DONTWAIT);
|
|
if ((m->m_flags & M_EXT) == 0) {
|
|
m_free(m);
|
|
m = NULL;
|
|
}
|
|
}
|
|
if (m == NULL)
|
|
return;
|
|
m->m_pkthdr.ph_rtableid = ifp->if_rdomain;
|
|
|
|
if (IN6_IS_ADDR_MULTICAST(daddr6)) {
|
|
m->m_flags |= M_MCAST;
|
|
im6o.im6o_ifidx = ifp->if_index;
|
|
im6o.im6o_hlim = 255;
|
|
im6o.im6o_loop = 0;
|
|
}
|
|
|
|
icmp6len = sizeof(*nd_na);
|
|
m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
|
|
m_align(m, maxlen);
|
|
|
|
/* fill neighbor advertisement packet */
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_flow = 0;
|
|
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
|
|
ip6->ip6_vfc |= IPV6_VERSION;
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
|
ip6->ip6_hlim = 255;
|
|
bzero(&dst_sa, sizeof(dst_sa));
|
|
dst_sa.sin6_len = sizeof(struct sockaddr_in6);
|
|
dst_sa.sin6_family = AF_INET6;
|
|
dst_sa.sin6_addr = *daddr6;
|
|
if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) {
|
|
/* reply to DAD */
|
|
dst_sa.sin6_addr.s6_addr16[0] = __IPV6_ADDR_INT16_MLL;
|
|
dst_sa.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
|
|
dst_sa.sin6_addr.s6_addr32[1] = 0;
|
|
dst_sa.sin6_addr.s6_addr32[2] = 0;
|
|
dst_sa.sin6_addr.s6_addr32[3] = __IPV6_ADDR_INT32_ONE;
|
|
|
|
flags &= ~ND_NA_FLAG_SOLICITED;
|
|
}
|
|
ip6->ip6_dst = dst_sa.sin6_addr;
|
|
|
|
/*
|
|
* Select a source whose scope is the same as that of the dest.
|
|
*/
|
|
rt = rtalloc(sin6tosa(&dst_sa), RT_RESOLVE, ifp->if_rdomain);
|
|
if (!rtisvalid(rt)) {
|
|
char addr[INET6_ADDRSTRLEN];
|
|
|
|
nd6log((LOG_DEBUG, "%s: source can't be determined: dst=%s\n",
|
|
__func__, inet_ntop(AF_INET6, &dst_sa.sin6_addr, addr,
|
|
sizeof(addr))));
|
|
rtfree(rt);
|
|
goto bad;
|
|
}
|
|
ip6->ip6_src = ifatoia6(rt->rt_ifa)->ia_addr.sin6_addr;
|
|
rtfree(rt);
|
|
nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
|
|
nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
|
|
nd_na->nd_na_code = 0;
|
|
nd_na->nd_na_target = *taddr6;
|
|
if (IN6_IS_SCOPE_EMBED(&nd_na->nd_na_target))
|
|
nd_na->nd_na_target.s6_addr16[1] = 0;
|
|
|
|
/*
|
|
* "tlladdr" indicates NS's condition for adding tlladdr or not.
|
|
* see nd6_ns_input() for details.
|
|
* Basically, if NS packet is sent to unicast/anycast addr,
|
|
* target lladdr option SHOULD NOT be included.
|
|
*/
|
|
if (tlladdr) {
|
|
/*
|
|
* sdl0 != NULL indicates proxy NA. If we do proxy, use
|
|
* lladdr in sdl0. If we are not proxying (sending NA for
|
|
* my address) use lladdr configured for the interface.
|
|
*/
|
|
if (sdl0 == NULL) {
|
|
mac = nd6_ifptomac(ifp);
|
|
} else if (sdl0->sa_family == AF_LINK) {
|
|
struct sockaddr_dl *sdl;
|
|
sdl = satosdl(sdl0);
|
|
if (sdl->sdl_alen == ifp->if_addrlen)
|
|
mac = LLADDR(sdl);
|
|
}
|
|
}
|
|
if (tlladdr && mac) {
|
|
int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
|
|
struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
|
|
|
|
/* roundup to 8 bytes alignment! */
|
|
optlen = (optlen + 7) & ~7;
|
|
|
|
m->m_pkthdr.len += optlen;
|
|
m->m_len += optlen;
|
|
icmp6len += optlen;
|
|
bzero((caddr_t)nd_opt, optlen);
|
|
nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
|
|
nd_opt->nd_opt_len = optlen >> 3;
|
|
bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
|
|
} else
|
|
flags &= ~ND_NA_FLAG_OVERRIDE;
|
|
|
|
ip6->ip6_plen = htons((u_short)icmp6len);
|
|
nd_na->nd_na_flags_reserved = flags;
|
|
nd_na->nd_na_cksum = 0;
|
|
m->m_pkthdr.csum_flags |= M_ICMP_CSUM_OUT;
|
|
|
|
ip6_output(m, NULL, NULL, 0, &im6o, NULL);
|
|
icmp6stat_inc(icp6s_outhist + ND_NEIGHBOR_ADVERT);
|
|
return;
|
|
|
|
bad:
|
|
m_freem(m);
|
|
}
|
|
|
|
caddr_t
|
|
nd6_ifptomac(struct ifnet *ifp)
|
|
{
|
|
switch (ifp->if_type) {
|
|
case IFT_ETHER:
|
|
case IFT_IEEE1394:
|
|
case IFT_PROPVIRTUAL:
|
|
case IFT_CARP:
|
|
case IFT_IEEE80211:
|
|
return ((caddr_t)(ifp + 1));
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
struct dadq *
|
|
nd6_dad_find(struct ifaddr *ifa)
|
|
{
|
|
struct dadq *dp;
|
|
|
|
TAILQ_FOREACH(dp, &dadq, dad_list) {
|
|
if (dp->dad_ifa == ifa)
|
|
return dp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
nd6_dad_destroy(struct dadq *dp)
|
|
{
|
|
TAILQ_REMOVE(&dadq, dp, dad_list);
|
|
ifafree(dp->dad_ifa);
|
|
free(dp, M_IP6NDP, sizeof(*dp));
|
|
ip6_dad_pending--;
|
|
}
|
|
|
|
void
|
|
nd6_dad_starttimer(struct dadq *dp)
|
|
{
|
|
timeout_set_proc(&dp->dad_timer_ch, nd6_dad_timer, dp->dad_ifa);
|
|
timeout_add_msec(&dp->dad_timer_ch, RETRANS_TIMER);
|
|
}
|
|
|
|
void
|
|
nd6_dad_stoptimer(struct dadq *dp)
|
|
{
|
|
timeout_del(&dp->dad_timer_ch);
|
|
}
|
|
|
|
/*
|
|
* Start Duplicated Address Detection (DAD) for specified interface address.
|
|
*/
|
|
void
|
|
nd6_dad_start(struct ifaddr *ifa)
|
|
{
|
|
struct in6_ifaddr *ia6 = ifatoia6(ifa);
|
|
struct dadq *dp;
|
|
char addr[INET6_ADDRSTRLEN];
|
|
|
|
NET_ASSERT_LOCKED();
|
|
|
|
/*
|
|
* If we don't need DAD, don't do it.
|
|
* There are several cases:
|
|
* - DAD is disabled (ip6_dad_count == 0)
|
|
* - the interface address is anycast
|
|
*/
|
|
KASSERT(ia6->ia6_flags & IN6_IFF_TENTATIVE);
|
|
if ((ia6->ia6_flags & IN6_IFF_ANYCAST) || (!ip6_dad_count)) {
|
|
ia6->ia6_flags &= ~IN6_IFF_TENTATIVE;
|
|
|
|
rtm_addr(RTM_CHGADDRATTR, ifa);
|
|
|
|
return;
|
|
}
|
|
|
|
/* DAD already in progress */
|
|
if (nd6_dad_find(ifa) != NULL)
|
|
return;
|
|
|
|
dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
|
|
if (dp == NULL) {
|
|
log(LOG_ERR, "%s: memory allocation failed for %s(%s)\n",
|
|
__func__, inet_ntop(AF_INET6, &ia6->ia_addr.sin6_addr,
|
|
addr, sizeof(addr)),
|
|
ifa->ifa_ifp ? ifa->ifa_ifp->if_xname : "???");
|
|
return;
|
|
}
|
|
|
|
TAILQ_INSERT_TAIL(&dadq, dp, dad_list);
|
|
ip6_dad_pending++;
|
|
|
|
nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", ifa->ifa_ifp->if_xname,
|
|
inet_ntop(AF_INET6, &ia6->ia_addr.sin6_addr, addr, sizeof(addr))));
|
|
|
|
/*
|
|
* Send NS packet for DAD, ip6_dad_count times.
|
|
* Note that we must delay the first transmission, if this is the
|
|
* first packet to be sent from the interface after interface
|
|
* (re)initialization.
|
|
*/
|
|
dp->dad_ifa = ifaref(ifa);
|
|
dp->dad_count = ip6_dad_count;
|
|
dp->dad_ns_icount = dp->dad_na_icount = 0;
|
|
dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
|
|
nd6_dad_ns_output(dp, ifa);
|
|
nd6_dad_starttimer(dp);
|
|
}
|
|
|
|
/*
|
|
* terminate DAD unconditionally. used for address removals.
|
|
*/
|
|
void
|
|
nd6_dad_stop(struct ifaddr *ifa)
|
|
{
|
|
struct dadq *dp;
|
|
|
|
dp = nd6_dad_find(ifa);
|
|
if (!dp) {
|
|
/* DAD wasn't started yet */
|
|
return;
|
|
}
|
|
|
|
nd6_dad_stoptimer(dp);
|
|
nd6_dad_destroy(dp);
|
|
}
|
|
|
|
void
|
|
nd6_dad_timer(void *xifa)
|
|
{
|
|
struct ifaddr *ifa;
|
|
struct in6_ifaddr *ia6;
|
|
struct in6_addr daddr6, taddr6;
|
|
struct ifnet *ifp;
|
|
struct dadq *dp;
|
|
char addr[INET6_ADDRSTRLEN];
|
|
|
|
NET_LOCK();
|
|
|
|
/* Sanity check */
|
|
if (xifa == NULL) {
|
|
log(LOG_ERR, "%s: called with null parameter\n", __func__);
|
|
goto done;
|
|
}
|
|
ifa = xifa;
|
|
ia6 = ifatoia6(ifa);
|
|
taddr6 = ia6->ia_addr.sin6_addr;
|
|
ifp = ifa->ifa_ifp;
|
|
dp = nd6_dad_find(ifa);
|
|
if (dp == NULL) {
|
|
log(LOG_ERR, "%s: DAD structure not found\n", __func__);
|
|
goto done;
|
|
}
|
|
if (ia6->ia6_flags & IN6_IFF_DUPLICATED) {
|
|
log(LOG_ERR, "%s: called with duplicated address %s(%s)\n",
|
|
__func__, inet_ntop(AF_INET6, &ia6->ia_addr.sin6_addr,
|
|
addr, sizeof(addr)),
|
|
ifa->ifa_ifp ? ifa->ifa_ifp->if_xname : "???");
|
|
goto done;
|
|
}
|
|
if ((ia6->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
|
|
log(LOG_ERR, "%s: called with non-tentative address %s(%s)\n",
|
|
__func__, inet_ntop(AF_INET6, &ia6->ia_addr.sin6_addr,
|
|
addr, sizeof(addr)),
|
|
ifa->ifa_ifp ? ifa->ifa_ifp->if_xname : "???");
|
|
goto done;
|
|
}
|
|
|
|
/* timeouted with IFF_{RUNNING,UP} check */
|
|
if (dp->dad_ns_tcount > dad_maxtry) {
|
|
nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n",
|
|
ifa->ifa_ifp->if_xname));
|
|
|
|
nd6_dad_destroy(dp);
|
|
goto done;
|
|
}
|
|
|
|
/* Need more checks? */
|
|
if (dp->dad_ns_ocount < dp->dad_count) {
|
|
/*
|
|
* We have more NS to go. Send NS packet for DAD.
|
|
*/
|
|
nd6_dad_ns_output(dp, ifa);
|
|
nd6_dad_starttimer(dp);
|
|
} else {
|
|
/*
|
|
* We have transmitted sufficient number of DAD packets.
|
|
*/
|
|
if (dp->dad_na_icount || dp->dad_ns_icount) {
|
|
/* dp will be freed in nd6_dad_duplicated() */
|
|
nd6_dad_duplicated(dp);
|
|
} else {
|
|
/*
|
|
* We are done with DAD. No NA came, no NS came.
|
|
*/
|
|
ia6->ia6_flags &= ~IN6_IFF_TENTATIVE;
|
|
|
|
rtm_addr(RTM_CHGADDRATTR, ifa);
|
|
|
|
nd6log((LOG_DEBUG,
|
|
"%s: DAD complete for %s - no duplicates found\n",
|
|
ifa->ifa_ifp->if_xname,
|
|
inet_ntop(AF_INET6, &ia6->ia_addr.sin6_addr,
|
|
addr, sizeof(addr))));
|
|
|
|
daddr6 = in6addr_linklocal_allrouters;
|
|
daddr6.s6_addr16[1] = htons(ifp->if_index);
|
|
/* RFC9131 - inform routers about our new address */
|
|
nd6_na_output(ifp, &daddr6, &taddr6, 0, 1, NULL);
|
|
|
|
nd6_dad_destroy(dp);
|
|
}
|
|
}
|
|
|
|
done:
|
|
NET_UNLOCK();
|
|
}
|
|
|
|
void
|
|
nd6_dad_duplicated(struct dadq *dp)
|
|
{
|
|
struct in6_ifaddr *ia6 = ifatoia6(dp->dad_ifa);
|
|
char addr[INET6_ADDRSTRLEN];
|
|
|
|
log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
|
|
"NS in/out=%d/%d, NA in=%d\n",
|
|
ia6->ia_ifp->if_xname,
|
|
inet_ntop(AF_INET6, &ia6->ia_addr.sin6_addr, addr, sizeof(addr)),
|
|
dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount);
|
|
|
|
ia6->ia6_flags &= ~IN6_IFF_TENTATIVE;
|
|
ia6->ia6_flags |= IN6_IFF_DUPLICATED;
|
|
|
|
/* We are done with DAD, with duplicated address found. (failure) */
|
|
nd6_dad_stoptimer(dp);
|
|
|
|
log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
|
|
ia6->ia_ifp->if_xname,
|
|
inet_ntop(AF_INET6, &ia6->ia_addr.sin6_addr, addr, sizeof(addr)));
|
|
log(LOG_ERR, "%s: manual intervention required\n",
|
|
ia6->ia_ifp->if_xname);
|
|
|
|
rtm_addr(RTM_CHGADDRATTR, dp->dad_ifa);
|
|
|
|
nd6_dad_destroy(dp);
|
|
}
|
|
|
|
void
|
|
nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa)
|
|
{
|
|
struct in6_ifaddr *ia6 = ifatoia6(ifa);
|
|
struct ifnet *ifp = ifa->ifa_ifp;
|
|
|
|
dp->dad_ns_tcount++;
|
|
if ((ifp->if_flags & IFF_UP) == 0) {
|
|
#if 0
|
|
printf("%s: interface down?\n", ifp->if_xname);
|
|
#endif
|
|
return;
|
|
}
|
|
if ((ifp->if_flags & IFF_RUNNING) == 0) {
|
|
#if 0
|
|
printf("%s: interface not running?\n", ifp->if_xname);
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
dp->dad_ns_ocount++;
|
|
nd6_ns_output(ifp, NULL, &ia6->ia_addr.sin6_addr, NULL, 1);
|
|
}
|
|
|
|
void
|
|
nd6_dad_ns_input(struct ifaddr *ifa)
|
|
{
|
|
struct dadq *dp;
|
|
|
|
if (!ifa)
|
|
panic("%s: ifa == NULL", __func__);
|
|
|
|
dp = nd6_dad_find(ifa);
|
|
if (dp == NULL) {
|
|
log(LOG_ERR, "%s: DAD structure not found\n", __func__);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* if I'm yet to start DAD, someone else started using this address
|
|
* first. I have a duplicate and you win.
|
|
*/
|
|
/* XXX more checks for loopback situation - see nd6_dad_timer too */
|
|
if (dp->dad_ns_ocount == 0) {
|
|
/* dp will be freed in nd6_dad_duplicated() */
|
|
nd6_dad_duplicated(dp);
|
|
} else {
|
|
/*
|
|
* not sure if I got a duplicate.
|
|
* increment ns count and see what happens.
|
|
*/
|
|
dp->dad_ns_icount++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check whether ``addr'' is a neighbor address connected to ``ifp''.
|
|
*/
|
|
int
|
|
nd6_isneighbor(const struct ifnet *ifp, const struct in6_addr *addr)
|
|
{
|
|
struct rtentry *rt;
|
|
struct sockaddr_in6 sin6;
|
|
unsigned int tableid = ifp->if_rdomain;
|
|
int rv = 0;
|
|
|
|
memset(&sin6, 0, sizeof(sin6));
|
|
sin6.sin6_len = sizeof(struct sockaddr_in6);
|
|
sin6.sin6_family = AF_INET6;
|
|
sin6.sin6_addr = *addr;
|
|
rt = rtalloc(sin6tosa(&sin6), 0, tableid);
|
|
|
|
if (rtisvalid(rt) && ISSET(rt->rt_flags, RTF_CLONING|RTF_CLONED))
|
|
rv = if_isconnected(ifp, rt->rt_ifidx);
|
|
|
|
rtfree(rt);
|
|
return (rv);
|
|
}
|