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/* $OpenBSD: pf_lb.c,v 1.74 2023/05/10 22:42:51 sashan Exp $ */
/*
* Copyright (c) 2001 Daniel Hartmeier
* Copyright (c) 2002 - 2008 Henning Brauer
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Effort sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F30602-01-2-0537.
*
*/
#include "bpfilter.h"
#include "pflog.h"
#include "pfsync.h"
#include "pflow.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/filio.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/kernel.h>
#include <sys/time.h>
#include <sys/pool.h>
#include <sys/rwlock.h>
#include <sys/syslog.h>
#include <sys/stdint.h>
#include <crypto/siphash.h>
#include <net/if.h>
#include <net/bpf.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
#include <netinet/ip_icmp.h>
#include <netinet/icmp_var.h>
#include <netinet/tcp.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/if_ether.h>
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#endif /* INET6 */
#include <net/pfvar.h>
#include <net/pfvar_priv.h>
#if NPFLOG > 0
#include <net/if_pflog.h>
#endif /* NPFLOG > 0 */
#if NPFLOW > 0
#include <net/if_pflow.h>
#endif /* NPFLOW > 0 */
#if NPFSYNC > 0
#include <net/if_pfsync.h>
#endif /* NPFSYNC > 0 */
u_int64_t pf_hash(struct pf_addr *, struct pf_addr *,
struct pf_poolhashkey *, sa_family_t);
int pf_get_sport(struct pf_pdesc *, struct pf_rule *,
struct pf_addr *, u_int16_t *, u_int16_t,
u_int16_t, struct pf_src_node **);
int pf_map_addr_states_increase(sa_family_t,
struct pf_pool *, struct pf_addr *);
int pf_get_transaddr_af(struct pf_rule *,
struct pf_pdesc *, struct pf_src_node **);
int pf_map_addr_sticky(sa_family_t, struct pf_rule *,
struct pf_addr *, struct pf_addr *,
struct pf_src_node **, struct pf_pool *,
enum pf_sn_types);
u_int64_t
pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
struct pf_poolhashkey *key, sa_family_t af)
{
uint64_t res = 0;
#ifdef INET6
union {
uint64_t hash64;
uint32_t hash32[2];
} h;
#endif /* INET6 */
switch (af) {
case AF_INET:
res = SipHash24((SIPHASH_KEY *)key,
&inaddr->addr32[0], sizeof(inaddr->addr32[0]));
hash->addr32[0] = res;
break;
#ifdef INET6
case AF_INET6:
res = SipHash24((SIPHASH_KEY *)key, &inaddr->addr32[0],
4 * sizeof(inaddr->addr32[0]));
h.hash64 = res;
hash->addr32[0] = h.hash32[0];
hash->addr32[1] = h.hash32[1];
/*
* siphash isn't big enough, but flipping it around is
* good enough here.
*/
hash->addr32[2] = ~h.hash32[1];
hash->addr32[3] = ~h.hash32[0];
break;
#endif /* INET6 */
default:
unhandled_af(af);
}
return (res);
}
int
pf_get_sport(struct pf_pdesc *pd, struct pf_rule *r,
struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
struct pf_src_node **sn)
{
struct pf_state_key_cmp key;
struct pf_addr init_addr;
u_int16_t cut;
int dir = (pd->dir == PF_IN) ? PF_OUT : PF_IN;
int sidx = pd->sidx;
int didx = pd->didx;
memset(&init_addr, 0, sizeof(init_addr));
if (pf_map_addr(pd->naf, r, &pd->nsaddr, naddr, &init_addr, sn, &r->nat,
PF_SN_NAT))
return (1);
if (pd->proto == IPPROTO_ICMP) {
if (pd->ndport == htons(ICMP_ECHO)) {
low = 1;
high = 65535;
} else
return (0); /* Don't try to modify non-echo ICMP */
}
#ifdef INET6
if (pd->proto == IPPROTO_ICMPV6) {
if (pd->ndport == htons(ICMP6_ECHO_REQUEST)) {
low = 1;
high = 65535;
} else
return (0); /* Don't try to modify non-echo ICMP */
}
#endif /* INET6 */
do {
key.af = pd->naf;
key.proto = pd->proto;
key.rdomain = pd->rdomain;
pf_addrcpy(&key.addr[didx], &pd->ndaddr, key.af);
pf_addrcpy(&key.addr[sidx], naddr, key.af);
key.port[didx] = pd->ndport;
/*
* port search; start random, step;
* similar 2 portloop in in_pcbbind
*/
if (!(pd->proto == IPPROTO_TCP || pd->proto == IPPROTO_UDP ||
pd->proto == IPPROTO_ICMP || pd->proto == IPPROTO_ICMPV6)) {
/* XXX bug: icmp states dont use the id on both
* XXX sides (traceroute -I through nat) */
key.port[sidx] = pd->nsport;
key.hash = pf_pkt_hash(key.af, key.proto, &key.addr[0],
&key.addr[1], key.port[0], key.port[1]);
if (pf_find_state_all(&key, dir, NULL) == NULL) {
*nport = pd->nsport;
return (0);
}
} else if (low == 0 && high == 0) {
key.port[sidx] = pd->nsport;
key.hash = pf_pkt_hash(key.af, key.proto, &key.addr[0],
&key.addr[1], key.port[0], key.port[1]);
if (pf_find_state_all(&key, dir, NULL) == NULL) {
*nport = pd->nsport;
return (0);
}
} else if (low == high) {
key.port[sidx] = htons(low);
key.hash = pf_pkt_hash(key.af, key.proto, &key.addr[0],
&key.addr[1], key.port[0], key.port[1]);
if (pf_find_state_all(&key, dir, NULL) == NULL) {
*nport = htons(low);
return (0);
}
} else {
u_int32_t tmp;
if (low > high) {
tmp = low;
low = high;
high = tmp;
}
/* low < high */
cut = arc4random_uniform(1 + high - low) + low;
/* low <= cut <= high */
for (tmp = cut; tmp <= high && tmp <= 0xffff; ++tmp) {
key.port[sidx] = htons(tmp);
key.hash = pf_pkt_hash(key.af, key.proto,
&key.addr[0], &key.addr[1], key.port[0],
key.port[1]);
if (pf_find_state_all(&key, dir, NULL) ==
NULL && !in_baddynamic(tmp, pd->proto)) {
*nport = htons(tmp);
return (0);
}
}
tmp = cut;
for (tmp -= 1; tmp >= low && tmp <= 0xffff; --tmp) {
key.port[sidx] = htons(tmp);
key.hash = pf_pkt_hash(key.af, key.proto,
&key.addr[0], &key.addr[1], key.port[0],
key.port[1]);
if (pf_find_state_all(&key, dir, NULL) ==
NULL && !in_baddynamic(tmp, pd->proto)) {
*nport = htons(tmp);
return (0);
}
}
}
switch (r->nat.opts & PF_POOL_TYPEMASK) {
case PF_POOL_RANDOM:
case PF_POOL_ROUNDROBIN:
case PF_POOL_LEASTSTATES:
/*
* pick a different source address since we're out
* of free port choices for the current one.
*/
if (pf_map_addr(pd->naf, r, &pd->nsaddr, naddr,
&init_addr, sn, &r->nat, PF_SN_NAT))
return (1);
break;
case PF_POOL_NONE:
case PF_POOL_SRCHASH:
case PF_POOL_BITMASK:
default:
return (1);
}
} while (! PF_AEQ(&init_addr, naddr, pd->naf) );
return (1); /* none available */
}
int
pf_map_addr_sticky(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
struct pf_addr *naddr, struct pf_src_node **sns, struct pf_pool *rpool,
enum pf_sn_types type)
{
struct pf_addr *raddr, *rmask, *cached;
struct pf_state *s;
struct pf_src_node k;
int valid;
k.af = af;
k.type = type;
pf_addrcpy(&k.addr, saddr, af);
k.rule.ptr = r;
pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
sns[type] = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
if (sns[type] == NULL)
return (-1);
/* check if the cached entry is still valid */
cached = &(sns[type])->raddr;
valid = 0;
if (PF_AZERO(cached, af)) {
valid = 1;
} else if (rpool->addr.type == PF_ADDR_DYNIFTL) {
if (pfr_kentry_byaddr(rpool->addr.p.dyn->pfid_kt, cached,
af, 0))
valid = 1;
} else if (rpool->addr.type == PF_ADDR_TABLE) {
if (pfr_kentry_byaddr(rpool->addr.p.tbl, cached, af, 0))
valid = 1;
} else if (rpool->addr.type != PF_ADDR_NOROUTE) {
raddr = &rpool->addr.v.a.addr;
rmask = &rpool->addr.v.a.mask;
valid = pf_match_addr(0, raddr, rmask, cached, af);
}
if (!valid) {
if (pf_status.debug >= LOG_DEBUG) {
log(LOG_DEBUG, "pf: pf_map_addr: "
"stale src tracking (%u) ", type);
pf_print_host(&k.addr, 0, af);
addlog(" to ");
pf_print_host(cached, 0, af);
addlog("\n");
}
if (sns[type]->states != 0) {
/* XXX expensive */
RBT_FOREACH(s, pf_state_tree_id, &tree_id)
pf_state_rm_src_node(s, sns[type]);
}
sns[type]->expire = 1;
pf_remove_src_node(sns[type]);
sns[type] = NULL;
return (-1);
}
if (!PF_AZERO(cached, af)) {
pf_addrcpy(naddr, cached, af);
if ((rpool->opts & PF_POOL_TYPEMASK) == PF_POOL_LEASTSTATES &&
pf_map_addr_states_increase(af, rpool, cached) == -1)
return (-1);
}
if (pf_status.debug >= LOG_DEBUG) {
log(LOG_DEBUG, "pf: pf_map_addr: "
"src tracking (%u) maps ", type);
pf_print_host(&k.addr, 0, af);
addlog(" to ");
pf_print_host(naddr, 0, af);
addlog("\n");
}
if (sns[type]->kif != NULL)
rpool->kif = sns[type]->kif;
return (0);
}
uint32_t
pf_rand_addr(uint32_t mask)
{
uint32_t addr;
mask = ~ntohl(mask);
addr = arc4random_uniform(mask + 1);
return (htonl(addr));
}
int
pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sns,
struct pf_pool *rpool, enum pf_sn_types type)
{
struct pf_addr hash;
struct pf_addr faddr;
struct pf_addr *raddr = &rpool->addr.v.a.addr;
struct pf_addr *rmask = &rpool->addr.v.a.mask;
struct pfr_ktable *kt;
struct pfi_kif *kif;
u_int64_t states;
u_int16_t weight;
u_int64_t load;
u_int64_t cload;
u_int64_t hashidx;
int cnt;
if (sns[type] == NULL && rpool->opts & PF_POOL_STICKYADDR &&
(rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE &&
pf_map_addr_sticky(af, r, saddr, naddr, sns, rpool, type) == 0)
return (0);
if (rpool->addr.type == PF_ADDR_NOROUTE)
return (1);
if (rpool->addr.type == PF_ADDR_DYNIFTL) {
switch (af) {
case AF_INET:
if (rpool->addr.p.dyn->pfid_acnt4 < 1 &&
!PF_POOL_DYNTYPE(rpool->opts))
return (1);
raddr = &rpool->addr.p.dyn->pfid_addr4;
rmask = &rpool->addr.p.dyn->pfid_mask4;
break;
#ifdef INET6
case AF_INET6:
if (rpool->addr.p.dyn->pfid_acnt6 < 1 &&
!PF_POOL_DYNTYPE(rpool->opts))
return (1);
raddr = &rpool->addr.p.dyn->pfid_addr6;
rmask = &rpool->addr.p.dyn->pfid_mask6;
break;
#endif /* INET6 */
default:
unhandled_af(af);
}
} else if (rpool->addr.type == PF_ADDR_TABLE) {
if (!PF_POOL_DYNTYPE(rpool->opts))
return (1); /* unsupported */
} else {
raddr = &rpool->addr.v.a.addr;
rmask = &rpool->addr.v.a.mask;
}
switch (rpool->opts & PF_POOL_TYPEMASK) {
case PF_POOL_NONE:
pf_addrcpy(naddr, raddr, af);
break;
case PF_POOL_BITMASK:
pf_poolmask(naddr, raddr, rmask, saddr, af);
break;
case PF_POOL_RANDOM:
if (rpool->addr.type == PF_ADDR_TABLE ||
rpool->addr.type == PF_ADDR_DYNIFTL) {
if (rpool->addr.type == PF_ADDR_TABLE)
kt = rpool->addr.p.tbl;
else
kt = rpool->addr.p.dyn->pfid_kt;
kt = pfr_ktable_select_active(kt);
if (kt == NULL)
return (1);
cnt = kt->pfrkt_cnt;
if (cnt == 0)
rpool->tblidx = 0;
else
rpool->tblidx = (int)arc4random_uniform(cnt);
memset(&rpool->counter, 0, sizeof(rpool->counter));
if (pfr_pool_get(rpool, &raddr, &rmask, af))
return (1);
pf_addrcpy(naddr, &rpool->counter, af);
} else if (init_addr != NULL && PF_AZERO(init_addr, af)) {
switch (af) {
case AF_INET:
rpool->counter.addr32[0] = pf_rand_addr(
rmask->addr32[0]);
break;
#ifdef INET6
case AF_INET6:
if (rmask->addr32[3] != 0xffffffff)
rpool->counter.addr32[3] = pf_rand_addr(
rmask->addr32[3]);
else
break;
if (rmask->addr32[2] != 0xffffffff)
rpool->counter.addr32[2] = pf_rand_addr(
rmask->addr32[2]);
else
break;
if (rmask->addr32[1] != 0xffffffff)
rpool->counter.addr32[1] = pf_rand_addr(
rmask->addr32[1]);
else
break;
if (rmask->addr32[0] != 0xffffffff)
rpool->counter.addr32[0] = pf_rand_addr(
rmask->addr32[0]);
break;
#endif /* INET6 */
default:
unhandled_af(af);
}
pf_poolmask(naddr, raddr, rmask, &rpool->counter, af);
pf_addrcpy(init_addr, naddr, af);
} else {
pf_addr_inc(&rpool->counter, af);
pf_poolmask(naddr, raddr, rmask, &rpool->counter, af);
}
break;
case PF_POOL_SRCHASH:
hashidx = pf_hash(saddr, &hash, &rpool->key, af);
if (rpool->addr.type == PF_ADDR_TABLE ||
rpool->addr.type == PF_ADDR_DYNIFTL) {
if (rpool->addr.type == PF_ADDR_TABLE)
kt = rpool->addr.p.tbl;
else
kt = rpool->addr.p.dyn->pfid_kt;
kt = pfr_ktable_select_active(kt);
if (kt == NULL)
return (1);
cnt = kt->pfrkt_cnt;
if (cnt == 0)
rpool->tblidx = 0;
else
rpool->tblidx = (int)(hashidx % cnt);
memset(&rpool->counter, 0, sizeof(rpool->counter));
if (pfr_pool_get(rpool, &raddr, &rmask, af))
return (1);
pf_addrcpy(naddr, &rpool->counter, af);
} else {
pf_poolmask(naddr, raddr, rmask, &hash, af);
}
break;
case PF_POOL_ROUNDROBIN:
if (rpool->addr.type == PF_ADDR_TABLE ||
rpool->addr.type == PF_ADDR_DYNIFTL) {
if (pfr_pool_get(rpool, &raddr, &rmask, af)) {
/*
* reset counter in case its value
* has been removed from the pool.
*/
memset(&rpool->counter, 0,
sizeof(rpool->counter));
if (pfr_pool_get(rpool, &raddr, &rmask, af))
return (1);
}
} else if (PF_AZERO(&rpool->counter, af)) {
/*
* fall back to POOL_NONE if there is a single host
* address in pool.
*/
if (af == AF_INET &&
rmask->addr32[0] == INADDR_BROADCAST) {
pf_addrcpy(naddr, raddr, af);
break;
}
#ifdef INET6
if (af == AF_INET6 &&
IN6_ARE_ADDR_EQUAL(&rmask->v6, &in6mask128)) {
pf_addrcpy(naddr, raddr, af);
break;
}
#endif
} else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
return (1);
/* iterate over table if it contains entries which are weighted */
if ((rpool->addr.type == PF_ADDR_TABLE &&
rpool->addr.p.tbl->pfrkt_refcntcost > 0) ||
(rpool->addr.type == PF_ADDR_DYNIFTL &&
rpool->addr.p.dyn->pfid_kt->pfrkt_refcntcost > 0)) {
do {
if (rpool->addr.type == PF_ADDR_TABLE ||
rpool->addr.type == PF_ADDR_DYNIFTL) {
if (pfr_pool_get(rpool,
&raddr, &rmask, af))
return (1);
} else {
log(LOG_ERR, "pf: pf_map_addr: "
"weighted RR failure");
return (1);
}
if (rpool->weight >= rpool->curweight)
break;
pf_addr_inc(&rpool->counter, af);
} while (1);
weight = rpool->weight;
}
pf_poolmask(naddr, raddr, rmask, &rpool->counter, af);
if (init_addr != NULL && PF_AZERO(init_addr, af))
pf_addrcpy(init_addr, &rpool->counter, af);
pf_addr_inc(&rpool->counter, af);
break;
case PF_POOL_LEASTSTATES:
/* retrieve an address first */
if (rpool->addr.type == PF_ADDR_TABLE ||
rpool->addr.type == PF_ADDR_DYNIFTL) {
if (pfr_pool_get(rpool, &raddr, &rmask, af)) {
/* see PF_POOL_ROUNDROBIN */
memset(&rpool->counter, 0,
sizeof(rpool->counter));
if (pfr_pool_get(rpool, &raddr, &rmask, af))
return (1);
}
} else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
return (1);
states = rpool->states;
weight = rpool->weight;
kif = rpool->kif;
if ((rpool->addr.type == PF_ADDR_TABLE &&
rpool->addr.p.tbl->pfrkt_refcntcost > 0) ||
(rpool->addr.type == PF_ADDR_DYNIFTL &&
rpool->addr.p.dyn->pfid_kt->pfrkt_refcntcost > 0))
load = ((UINT16_MAX * rpool->states) / rpool->weight);
else
load = states;
pf_addrcpy(&faddr, &rpool->counter, af);
pf_addrcpy(naddr, &rpool->counter, af);
if (init_addr != NULL && PF_AZERO(init_addr, af))
pf_addrcpy(init_addr, naddr, af);
/*
* iterate *once* over whole table and find destination with
* least connection
*/
do {
pf_addr_inc(&rpool->counter, af);
if (rpool->addr.type == PF_ADDR_TABLE ||
rpool->addr.type == PF_ADDR_DYNIFTL) {
if (pfr_pool_get(rpool, &raddr, &rmask, af))
return (1);
} else if (pf_match_addr(0, raddr, rmask,
&rpool->counter, af))
return (1);
if ((rpool->addr.type == PF_ADDR_TABLE &&
rpool->addr.p.tbl->pfrkt_refcntcost > 0) ||
(rpool->addr.type == PF_ADDR_DYNIFTL &&
rpool->addr.p.dyn->pfid_kt->pfrkt_refcntcost > 0))
cload = ((UINT16_MAX * rpool->states)
/ rpool->weight);
else
cload = rpool->states;
/* find lc minimum */
if (cload < load) {
states = rpool->states;
weight = rpool->weight;
kif = rpool->kif;
load = cload;
pf_addrcpy(naddr, &rpool->counter, af);
if (init_addr != NULL &&
PF_AZERO(init_addr, af))
pf_addrcpy(init_addr, naddr, af);
}
} while (pf_match_addr(1, &faddr, rmask, &rpool->counter, af) &&
(states > 0));
if (pf_map_addr_states_increase(af, rpool, naddr) == -1)
return (1);
/* revert the kif which was set by pfr_pool_get() */
rpool->kif = kif;
break;
}
if (rpool->opts & PF_POOL_STICKYADDR) {
if (sns[type] != NULL) {
pf_remove_src_node(sns[type]);
sns[type] = NULL;
}
if (pf_insert_src_node(&sns[type], r, type, af, saddr, naddr,
rpool->kif))
return (1);
}
if (pf_status.debug >= LOG_INFO &&
(rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
log(LOG_INFO, "pf: pf_map_addr: selected address ");
pf_print_host(naddr, 0, af);
if ((rpool->opts & PF_POOL_TYPEMASK) ==
PF_POOL_LEASTSTATES)
addlog(" with state count %llu", states);
if ((rpool->addr.type == PF_ADDR_TABLE &&
rpool->addr.p.tbl->pfrkt_refcntcost > 0) ||
(rpool->addr.type == PF_ADDR_DYNIFTL &&
rpool->addr.p.dyn->pfid_kt->pfrkt_refcntcost > 0))
addlog(" with weight %u", weight);
addlog("\n");
}
return (0);
}
int
pf_map_addr_states_increase(sa_family_t af, struct pf_pool *rpool,
struct pf_addr *naddr)
{
if (rpool->addr.type == PF_ADDR_TABLE) {
if (pfr_states_increase(rpool->addr.p.tbl,
naddr, af) == -1) {
if (pf_status.debug >= LOG_DEBUG) {
log(LOG_DEBUG,
"pf: pf_map_addr_states_increase: "
"selected address ");
pf_print_host(naddr, 0, af);
addlog(". Failed to increase count!\n");
}
return (-1);
}
} else if (rpool->addr.type == PF_ADDR_DYNIFTL) {
if (pfr_states_increase(rpool->addr.p.dyn->pfid_kt,
naddr, af) == -1) {
if (pf_status.debug >= LOG_DEBUG) {
log(LOG_DEBUG,
"pf: pf_map_addr_states_increase: "
"selected address ");
pf_print_host(naddr, 0, af);
addlog(". Failed to increase count!\n");
}
return (-1);
}
}
return (0);
}
int
pf_get_transaddr(struct pf_rule *r, struct pf_pdesc *pd,
struct pf_src_node **sns, struct pf_rule **nr)
{
struct pf_addr naddr;
u_int16_t nport;
#ifdef INET6
if (pd->af != pd->naf)
return (pf_get_transaddr_af(r, pd, sns));
#endif /* INET6 */
if (r->nat.addr.type != PF_ADDR_NONE) {
/* XXX is this right? what if rtable is changed at the same
* XXX time? where do I need to figure out the sport? */
nport = 0;
if (pf_get_sport(pd, r, &naddr, &nport,
r->nat.proxy_port[0], r->nat.proxy_port[1], sns)) {
DPFPRINTF(LOG_NOTICE,
"pf: NAT proxy port allocation (%u-%u) failed",
r->nat.proxy_port[0],
r->nat.proxy_port[1]);
return (-1);
}
*nr = r;
pf_addrcpy(&pd->nsaddr, &naddr, pd->af);
pd->nsport = nport;
}
if (r->rdr.addr.type != PF_ADDR_NONE) {
if (pf_map_addr(pd->af, r, &pd->nsaddr, &naddr, NULL, sns,
&r->rdr, PF_SN_RDR))
return (-1);
if ((r->rdr.opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK)
pf_poolmask(&naddr, &naddr, &r->rdr.addr.v.a.mask,
&pd->ndaddr, pd->af);
nport = 0;
if (r->rdr.proxy_port[1]) {
u_int32_t tmp_nport;
u_int16_t div;
div = r->rdr.proxy_port[1] - r->rdr.proxy_port[0] + 1;
div = (div == 0) ? 1 : div;
tmp_nport = ((ntohs(pd->ndport) - ntohs(r->dst.port[0])) % div) +
r->rdr.proxy_port[0];
/* wrap around if necessary */
if (tmp_nport > 65535)
tmp_nport -= 65535;
nport = htons((u_int16_t)tmp_nport);
} else if (r->rdr.proxy_port[0])
nport = htons(r->rdr.proxy_port[0]);
*nr = r;
pf_addrcpy(&pd->ndaddr, &naddr, pd->af);
if (nport)
pd->ndport = nport;
}
return (0);
}
#ifdef INET6
int
pf_get_transaddr_af(struct pf_rule *r, struct pf_pdesc *pd,
struct pf_src_node **sns)
{
struct pf_addr ndaddr, nsaddr, naddr;
u_int16_t nport;
int prefixlen = 96;
if (pf_status.debug >= LOG_INFO) {
log(LOG_INFO, "pf: af-to %s %s, ",
pd->naf == AF_INET ? "inet" : "inet6",
r->rdr.addr.type == PF_ADDR_NONE ? "nat" : "rdr");
pf_print_host(&pd->nsaddr, pd->nsport, pd->af);
addlog(" -> ");
pf_print_host(&pd->ndaddr, pd->ndport, pd->af);
addlog("\n");
}
if (r->nat.addr.type == PF_ADDR_NONE)
panic("pf_get_transaddr_af: no nat pool for source address");
/* get source address and port */
nport = 0;
if (pf_get_sport(pd, r, &nsaddr, &nport,
r->nat.proxy_port[0], r->nat.proxy_port[1], sns)) {
DPFPRINTF(LOG_NOTICE,
"pf: af-to NAT proxy port allocation (%u-%u) failed",
r->nat.proxy_port[0],
r->nat.proxy_port[1]);
return (-1);
}
pd->nsport = nport;
if (pd->proto == IPPROTO_ICMPV6 && pd->naf == AF_INET) {
if (pd->dir == PF_IN) {
pd->ndport = ntohs(pd->ndport);
if (pd->ndport == ICMP6_ECHO_REQUEST)
pd->ndport = ICMP_ECHO;
else if (pd->ndport == ICMP6_ECHO_REPLY)
pd->ndport = ICMP_ECHOREPLY;
pd->ndport = htons(pd->ndport);
} else {
pd->nsport = ntohs(pd->nsport);
if (pd->nsport == ICMP6_ECHO_REQUEST)
pd->nsport = ICMP_ECHO;
else if (pd->nsport == ICMP6_ECHO_REPLY)
pd->nsport = ICMP_ECHOREPLY;
pd->nsport = htons(pd->nsport);
}
} else if (pd->proto == IPPROTO_ICMP && pd->naf == AF_INET6) {
if (pd->dir == PF_IN) {
pd->ndport = ntohs(pd->ndport);
if (pd->ndport == ICMP_ECHO)
pd->ndport = ICMP6_ECHO_REQUEST;
else if (pd->ndport == ICMP_ECHOREPLY)
pd->ndport = ICMP6_ECHO_REPLY;
pd->ndport = htons(pd->ndport);
} else {
pd->nsport = ntohs(pd->nsport);
if (pd->nsport == ICMP_ECHO)
pd->nsport = ICMP6_ECHO_REQUEST;
else if (pd->nsport == ICMP_ECHOREPLY)
pd->nsport = ICMP6_ECHO_REPLY;
pd->nsport = htons(pd->nsport);
}
}
/* get the destination address and port */
if (r->rdr.addr.type != PF_ADDR_NONE) {
if (pf_map_addr(pd->naf, r, &nsaddr, &naddr, NULL, sns,
&r->rdr, PF_SN_RDR))
return (-1);
if (r->rdr.proxy_port[0])
pd->ndport = htons(r->rdr.proxy_port[0]);
if (pd->naf == AF_INET) {
/* The prefix is the IPv4 rdr address */
prefixlen = in_mask2len((struct in_addr *)
&r->rdr.addr.v.a.mask);
inet_nat46(pd->naf, &pd->ndaddr,
&ndaddr, &naddr, prefixlen);
} else {
/* The prefix is the IPv6 rdr address */
prefixlen =
in6_mask2len((struct in6_addr *)
&r->rdr.addr.v.a.mask, NULL);
inet_nat64(pd->naf, &pd->ndaddr,
&ndaddr, &naddr, prefixlen);
}
} else {
if (pd->naf == AF_INET) {
/* The prefix is the IPv6 dst address */
prefixlen =
in6_mask2len((struct in6_addr *)
&r->dst.addr.v.a.mask, NULL);
if (prefixlen < 32)
prefixlen = 96;
inet_nat64(pd->naf, &pd->ndaddr,
&ndaddr, &pd->ndaddr, prefixlen);
} else {
/*
* The prefix is the IPv6 nat address
* (that was stored in pd->nsaddr)
*/
prefixlen = in6_mask2len((struct in6_addr *)
&r->nat.addr.v.a.mask, NULL);
if (prefixlen > 96)
prefixlen = 96;
inet_nat64(pd->naf, &pd->ndaddr,
&ndaddr, &nsaddr, prefixlen);
}
}
pf_addrcpy(&pd->nsaddr, &nsaddr, pd->naf);
pf_addrcpy(&pd->ndaddr, &ndaddr, pd->naf);
if (pf_status.debug >= LOG_INFO) {
log(LOG_INFO, "pf: af-to %s %s done, prefixlen %d, ",
pd->naf == AF_INET ? "inet" : "inet6",
r->rdr.addr.type == PF_ADDR_NONE ? "nat" : "rdr",
prefixlen);
pf_print_host(&pd->nsaddr, pd->nsport, pd->naf);
addlog(" -> ");
pf_print_host(&pd->ndaddr, pd->ndport, pd->naf);
addlog("\n");
}
return (0);
}
#endif /* INET6 */
int
pf_postprocess_addr(struct pf_state *cur)
{
struct pf_rule *nr;
struct pf_state_key *sks;
struct pf_pool rpool;
struct pf_addr lookup_addr;
int slbcount = -1;
nr = cur->natrule.ptr;
if (nr == NULL)
return (0);
/* decrease counter */
sks = cur->key[PF_SK_STACK];
/* check for outgoing or ingoing balancing */
if (nr->rt == PF_ROUTETO)
lookup_addr = cur->rt_addr;
else if (sks != NULL)
lookup_addr = sks->addr[1];
else {
if (pf_status.debug >= LOG_DEBUG) {
log(LOG_DEBUG, "pf: %s: unable to obtain address",
__func__);
}
return (1);
}
/* check for appropriate pool */
if (nr->rdr.addr.type != PF_ADDR_NONE)
rpool = nr->rdr;
else if (nr->nat.addr.type != PF_ADDR_NONE)
rpool = nr->nat;
else if (nr->route.addr.type != PF_ADDR_NONE)
rpool = nr->route;
else
return (0);
if (((rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_LEASTSTATES))
return (0);
if (rpool.addr.type == PF_ADDR_TABLE) {
if ((slbcount = pfr_states_decrease(
rpool.addr.p.tbl,
&lookup_addr, sks->af)) == -1) {
if (pf_status.debug >= LOG_DEBUG) {
log(LOG_DEBUG, "pf: %s: selected address ",
__func__);
pf_print_host(&lookup_addr,
sks->port[0], sks->af);
addlog(". Failed to "
"decrease count!\n");
}
return (1);
}
} else if (rpool.addr.type == PF_ADDR_DYNIFTL) {
if ((slbcount = pfr_states_decrease(
rpool.addr.p.dyn->pfid_kt,
&lookup_addr, sks->af)) == -1) {
if (pf_status.debug >= LOG_DEBUG) {
log(LOG_DEBUG, "pf: %s: selected address ",
__func__);
pf_print_host(&lookup_addr,
sks->port[0], sks->af);
addlog(". Failed to "
"decrease count!\n");
}
return (1);
}
}
if (slbcount > -1) {
if (pf_status.debug >= LOG_INFO) {
log(LOG_INFO, "pf: %s: selected address ", __func__);
pf_print_host(&lookup_addr, sks->port[0],
sks->af);
addlog(" decreased state count to %u\n",
slbcount);
}
}
return (0);
}
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