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NetBSD/sys/dist/pf/net/pf.c

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/* $NetBSD: pf.c,v 1.36 2007/03/04 06:02:58 christos Exp $ */
/* $OpenBSD: pf.c,v 1.487 2005/04/22 09:53:18 dhartmei Exp $ */
/*
* Copyright (c) 2001 Daniel Hartmeier
* Copyright (c) 2002,2003 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"
#ifdef __OpenBSD__
#include "pfsync.h"
#else
#define NPFSYNC 0
#endif
#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>
#ifdef __NetBSD__
#include <sys/endian.h>
#endif
#include <net/if.h>
#include <net/if_types.h>
#include <net/bpf.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcp_seq.h>
#include <netinet/udp.h>
#include <netinet/ip_icmp.h>
#include <netinet/in_pcb.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/udp_var.h>
#include <netinet/icmp_var.h>
#ifdef __OpenBSD__
#include <netinet/if_ether.h>
#else
#include <net/if_ether.h>
#endif
#ifdef __OpenBSD__
#include <dev/rndvar.h>
#else
#include <sys/rnd.h>
#endif
#include <net/pfvar.h>
#include <net/if_pflog.h>
#if NPFSYNC > 0
#include <net/if_pfsync.h>
#endif /* NPFSYNC > 0 */
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#ifdef __NetBSD__
#include <netinet6/in6_pcb.h>
#endif
#include <netinet/icmp6.h>
#include <netinet6/nd6.h>
#endif /* INET6 */
#define DPFPRINTF(n, x) if (pf_status.debug >= (n)) printf x
/*
* Global variables
*/
struct pf_anchor_global pf_anchors;
struct pf_ruleset pf_main_ruleset;
struct pf_altqqueue pf_altqs[2];
struct pf_palist pf_pabuf;
struct pf_altqqueue *pf_altqs_active;
struct pf_altqqueue *pf_altqs_inactive;
struct pf_status pf_status;
u_int32_t ticket_altqs_active;
u_int32_t ticket_altqs_inactive;
int altqs_inactive_open;
u_int32_t ticket_pabuf;
#ifdef __OpenBSD__
struct timeout pf_expire_to; /* expire timeout */
#else
struct callout pf_expire_to; /* expire timeout */
#endif
struct pf_anchor_stackframe {
struct pf_ruleset *rs;
struct pf_rule *r;
struct pf_anchor_node *parent;
struct pf_anchor *child;
} pf_anchor_stack[64];
struct pool pf_src_tree_pl, pf_rule_pl;
struct pool pf_state_pl, pf_altq_pl, pf_pooladdr_pl;
void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
void pf_init_threshold(struct pf_threshold *, u_int32_t,
u_int32_t);
void pf_add_threshold(struct pf_threshold *);
int pf_check_threshold(struct pf_threshold *);
void pf_change_ap(struct pf_addr *, u_int16_t *,
u_int16_t *, u_int16_t *, struct pf_addr *,
u_int16_t, u_int8_t, sa_family_t);
#ifdef INET6
void pf_change_a6(struct pf_addr *, u_int16_t *,
struct pf_addr *, u_int8_t);
#endif /* INET6 */
void pf_change_icmp(struct pf_addr *, u_int16_t *,
struct pf_addr *, struct pf_addr *, u_int16_t,
u_int16_t *, u_int16_t *, u_int16_t *,
u_int16_t *, u_int8_t, sa_family_t);
void pf_send_tcp(const struct pf_rule *, sa_family_t,
const struct pf_addr *, const struct pf_addr *,
u_int16_t, u_int16_t, u_int32_t, u_int32_t,
u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
u_int16_t, struct ether_header *, struct ifnet *);
void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
sa_family_t, struct pf_rule *);
struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *,
int, int, struct pfi_kif *,
struct pf_addr *, u_int16_t, struct pf_addr *,
u_int16_t, int);
struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *,
int, int, struct pfi_kif *, struct pf_src_node **,
struct pf_addr *, u_int16_t,
struct pf_addr *, u_int16_t,
struct pf_addr *, u_int16_t *);
int pf_test_tcp(struct pf_rule **, struct pf_state **,
int, struct pfi_kif *, struct mbuf *, int,
void *, struct pf_pdesc *, struct pf_rule **,
struct pf_ruleset **, struct ifqueue *);
int pf_test_udp(struct pf_rule **, struct pf_state **,
int, struct pfi_kif *, struct mbuf *, int,
void *, struct pf_pdesc *, struct pf_rule **,
struct pf_ruleset **, struct ifqueue *);
int pf_test_icmp(struct pf_rule **, struct pf_state **,
int, struct pfi_kif *, struct mbuf *, int,
void *, struct pf_pdesc *, struct pf_rule **,
struct pf_ruleset **, struct ifqueue *);
int pf_test_other(struct pf_rule **, struct pf_state **,
int, struct pfi_kif *, struct mbuf *, int, void *,
struct pf_pdesc *, struct pf_rule **,
struct pf_ruleset **, struct ifqueue *);
int pf_test_fragment(struct pf_rule **, int,
struct pfi_kif *, struct mbuf *, void *,
struct pf_pdesc *, struct pf_rule **,
struct pf_ruleset **);
int pf_test_state_tcp(struct pf_state **, int,
struct pfi_kif *, struct mbuf *, int,
void *, struct pf_pdesc *, u_short *);
int pf_test_state_udp(struct pf_state **, int,
struct pfi_kif *, struct mbuf *, int,
void *, struct pf_pdesc *);
int pf_test_state_icmp(struct pf_state **, int,
struct pfi_kif *, struct mbuf *, int,
void *, struct pf_pdesc *, u_short *);
int pf_test_state_other(struct pf_state **, int,
struct pfi_kif *, struct pf_pdesc *);
struct pf_tag *pf_get_tag(struct mbuf *);
int pf_match_tag(struct mbuf *, struct pf_rule *,
struct pf_tag **, int *);
void pf_hash(const struct pf_addr *, struct pf_addr *,
struct pf_poolhashkey *, sa_family_t);
int pf_map_addr(u_int8_t, struct pf_rule *,
const struct pf_addr *, struct pf_addr *,
struct pf_addr *, struct pf_src_node **);
int pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *,
struct pf_addr *, struct pf_addr *, u_int16_t,
struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t,
struct pf_src_node **);
void pf_route(struct mbuf **, struct pf_rule *, int,
struct ifnet *, struct pf_state *);
void pf_route6(struct mbuf **, struct pf_rule *, int,
struct ifnet *, struct pf_state *);
int pf_socket_lookup(uid_t *, gid_t *,
int, struct pf_pdesc *);
u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t,
sa_family_t);
u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t,
sa_family_t);
u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t,
u_int16_t);
void pf_set_rt_ifp(struct pf_state *,
struct pf_addr *);
int pf_check_proto_cksum(struct mbuf *, int, int,
u_int8_t, sa_family_t);
int pf_addr_wrap_neq(struct pf_addr_wrap *,
struct pf_addr_wrap *);
static int pf_add_mbuf_tag(struct mbuf *, u_int);
struct pf_state *pf_find_state_recurse(struct pfi_kif *,
struct pf_state *, u_int8_t);
int pf_src_connlimit(struct pf_state **);
int pf_check_congestion(struct ifqueue *);
struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = {
{ &pf_state_pl, PFSTATE_HIWAT },
{ &pf_src_tree_pl, PFSNODE_HIWAT },
{ &pf_frent_pl, PFFRAG_FRENT_HIWAT }
};
#define STATE_LOOKUP() \
do { \
if (direction == PF_IN) \
*state = pf_find_state_recurse( \
kif, &key, PF_EXT_GWY); \
else \
*state = pf_find_state_recurse( \
kif, &key, PF_LAN_EXT); \
if (*state == NULL || (*state)->timeout == PFTM_PURGE) \
return (PF_DROP); \
if (direction == PF_OUT && \
(((*state)->rule.ptr->rt == PF_ROUTETO && \
(*state)->rule.ptr->direction == PF_OUT) || \
((*state)->rule.ptr->rt == PF_REPLYTO && \
(*state)->rule.ptr->direction == PF_IN)) && \
(*state)->rt_kif != NULL && \
(*state)->rt_kif != kif) \
return (PF_PASS); \
} while (0)
#define STATE_TRANSLATE(s) \
(s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \
((s)->af == AF_INET6 && \
((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \
(s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \
(s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \
(s)->lan.port != (s)->gwy.port
#define BOUND_IFACE(r, k) (((r)->rule_flag & PFRULE_IFBOUND) ? (k) : \
((r)->rule_flag & PFRULE_GRBOUND) ? (k)->pfik_parent : \
(k)->pfik_parent->pfik_parent)
#define STATE_INC_COUNTERS(s) \
do { \
s->rule.ptr->states++; \
if (s->anchor.ptr != NULL) \
s->anchor.ptr->states++; \
if (s->nat_rule.ptr != NULL) \
s->nat_rule.ptr->states++; \
} while (0)
#define STATE_DEC_COUNTERS(s) \
do { \
if (s->nat_rule.ptr != NULL) \
s->nat_rule.ptr->states--; \
if (s->anchor.ptr != NULL) \
s->anchor.ptr->states--; \
s->rule.ptr->states--; \
} while (0)
static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
static __inline int pf_state_compare_lan_ext(struct pf_state *,
struct pf_state *);
static __inline int pf_state_compare_ext_gwy(struct pf_state *,
struct pf_state *);
static __inline int pf_state_compare_id(struct pf_state *,
struct pf_state *);
static __inline int pf_anchor_compare(struct pf_anchor *, struct pf_anchor *);
struct pf_src_tree tree_src_tracking;
struct pf_state_tree_id tree_id;
struct pf_state_queue state_updates;
RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
RB_GENERATE(pf_state_tree_lan_ext, pf_state,
u.s.entry_lan_ext, pf_state_compare_lan_ext);
RB_GENERATE(pf_state_tree_ext_gwy, pf_state,
u.s.entry_ext_gwy, pf_state_compare_ext_gwy);
RB_GENERATE(pf_state_tree_id, pf_state,
u.s.entry_id, pf_state_compare_id);
RB_GENERATE(pf_anchor_global, pf_anchor, entry_global, pf_anchor_compare);
RB_GENERATE(pf_anchor_node, pf_anchor, entry_node, pf_anchor_compare);
static __inline int
pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
{
int diff;
if (a->rule.ptr > b->rule.ptr)
return (1);
if (a->rule.ptr < b->rule.ptr)
return (-1);
if ((diff = a->af - b->af) != 0)
return (diff);
switch (a->af) {
#ifdef INET
case AF_INET:
if (a->addr.addr32[0] > b->addr.addr32[0])
return (1);
if (a->addr.addr32[0] < b->addr.addr32[0])
return (-1);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
if (a->addr.addr32[3] > b->addr.addr32[3])
return (1);
if (a->addr.addr32[3] < b->addr.addr32[3])
return (-1);
if (a->addr.addr32[2] > b->addr.addr32[2])
return (1);
if (a->addr.addr32[2] < b->addr.addr32[2])
return (-1);
if (a->addr.addr32[1] > b->addr.addr32[1])
return (1);
if (a->addr.addr32[1] < b->addr.addr32[1])
return (-1);
if (a->addr.addr32[0] > b->addr.addr32[0])
return (1);
if (a->addr.addr32[0] < b->addr.addr32[0])
return (-1);
break;
#endif /* INET6 */
}
return (0);
}
static __inline int
pf_state_compare_lan_ext(struct pf_state *a, struct pf_state *b)
{
int diff;
if ((diff = a->proto - b->proto) != 0)
return (diff);
if ((diff = a->af - b->af) != 0)
return (diff);
switch (a->af) {
#ifdef INET
case AF_INET:
if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
return (1);
if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
return (-1);
if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
return (1);
if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
return (-1);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3])
return (1);
if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3])
return (-1);
if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
return (1);
if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
return (-1);
if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2])
return (1);
if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2])
return (-1);
if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
return (1);
if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
return (-1);
if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1])
return (1);
if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1])
return (-1);
if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
return (1);
if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
return (-1);
if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
return (1);
if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
return (-1);
if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
return (1);
if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
return (-1);
break;
#endif /* INET6 */
}
if ((diff = a->lan.port - b->lan.port) != 0)
return (diff);
if ((diff = a->ext.port - b->ext.port) != 0)
return (diff);
return (0);
}
static __inline int
pf_state_compare_ext_gwy(struct pf_state *a, struct pf_state *b)
{
int diff;
if ((diff = a->proto - b->proto) != 0)
return (diff);
if ((diff = a->af - b->af) != 0)
return (diff);
switch (a->af) {
#ifdef INET
case AF_INET:
if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
return (1);
if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
return (-1);
if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
return (1);
if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
return (-1);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
return (1);
if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
return (-1);
if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3])
return (1);
if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3])
return (-1);
if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
return (1);
if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
return (-1);
if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2])
return (1);
if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2])
return (-1);
if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
return (1);
if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
return (-1);
if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1])
return (1);
if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1])
return (-1);
if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
return (1);
if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
return (-1);
if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
return (1);
if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
return (-1);
break;
#endif /* INET6 */
}
if ((diff = a->ext.port - b->ext.port) != 0)
return (diff);
if ((diff = a->gwy.port - b->gwy.port) != 0)
return (diff);
return (0);
}
static __inline int
pf_state_compare_id(struct pf_state *a, 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);
}
static __inline int
pf_anchor_compare(struct pf_anchor *a, struct pf_anchor *b)
{
int c = strcmp(a->path, b->path);
return (c ? (c < 0 ? -1 : 1) : 0);
}
#ifdef INET6
void
pf_addrcpy(struct pf_addr *dst, const struct pf_addr *src, sa_family_t af)
{
switch (af) {
#ifdef INET
case AF_INET:
dst->addr32[0] = src->addr32[0];
break;
#endif /* INET */
case AF_INET6:
dst->addr32[0] = src->addr32[0];
dst->addr32[1] = src->addr32[1];
dst->addr32[2] = src->addr32[2];
dst->addr32[3] = src->addr32[3];
break;
}
}
#endif /* INET6 */
struct pf_state *
pf_find_state_byid(struct pf_state *key)
{
pf_status.fcounters[FCNT_STATE_SEARCH]++;
return (RB_FIND(pf_state_tree_id, &tree_id, key));
}
struct pf_state *
pf_find_state_recurse(struct pfi_kif *kif, struct pf_state *key, u_int8_t tree)
{
struct pf_state *s;
pf_status.fcounters[FCNT_STATE_SEARCH]++;
switch (tree) {
case PF_LAN_EXT:
for (; kif != NULL; kif = kif->pfik_parent) {
s = RB_FIND(pf_state_tree_lan_ext,
&kif->pfik_lan_ext, key);
if (s != NULL)
return (s);
}
return (NULL);
case PF_EXT_GWY:
for (; kif != NULL; kif = kif->pfik_parent) {
s = RB_FIND(pf_state_tree_ext_gwy,
&kif->pfik_ext_gwy, key);
if (s != NULL)
return (s);
}
return (NULL);
default:
panic("pf_find_state_recurse");
}
}
struct pf_state *
pf_find_state_all(struct pf_state *key, u_int8_t tree, int *more)
{
struct pf_state *s, *ss = NULL;
struct pfi_kif *kif;
pf_status.fcounters[FCNT_STATE_SEARCH]++;
switch (tree) {
case PF_LAN_EXT:
TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) {
s = RB_FIND(pf_state_tree_lan_ext,
&kif->pfik_lan_ext, key);
if (s == NULL)
continue;
if (more == NULL)
return (s);
ss = s;
(*more)++;
}
return (ss);
case PF_EXT_GWY:
TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) {
s = RB_FIND(pf_state_tree_ext_gwy,
&kif->pfik_ext_gwy, key);
if (s == NULL)
continue;
if (more == NULL)
return (s);
ss = s;
(*more)++;
}
return (ss);
default:
panic("pf_find_state_all");
}
}
void
pf_init_threshold(struct pf_threshold *threshold,
u_int32_t limit, u_int32_t seconds)
{
threshold->limit = limit * PF_THRESHOLD_MULT;
threshold->seconds = seconds;
threshold->count = 0;
threshold->last = time_second;
}
void
pf_add_threshold(struct pf_threshold *threshold)
{
u_int32_t t = time_second, diff = t - threshold->last;
if (diff >= threshold->seconds)
threshold->count = 0;
else
threshold->count -= threshold->count * diff /
threshold->seconds;
threshold->count += PF_THRESHOLD_MULT;
threshold->last = t;
}
int
pf_check_threshold(struct pf_threshold *threshold)
{
return (threshold->count > threshold->limit);
}
int
pf_src_connlimit(struct pf_state **state)
{
struct pf_state *s;
int bad = 0;
(*state)->src_node->conn++;
pf_add_threshold(&(*state)->src_node->conn_rate);
if ((*state)->rule.ptr->max_src_conn &&
(*state)->rule.ptr->max_src_conn <
(*state)->src_node->conn) {
pf_status.lcounters[LCNT_SRCCONN]++;
bad++;
}
if ((*state)->rule.ptr->max_src_conn_rate.limit &&
pf_check_threshold(&(*state)->src_node->conn_rate)) {
pf_status.lcounters[LCNT_SRCCONNRATE]++;
bad++;
}
if (!bad)
return (0);
if ((*state)->rule.ptr->overload_tbl) {
struct pfr_addr p;
u_int32_t killed = 0;
pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
if (pf_status.debug >= PF_DEBUG_MISC) {
printf("pf_src_connlimit: blocking address ");
pf_print_host(&(*state)->src_node->addr, 0,
(*state)->af);
}
bzero(&p, sizeof(p));
p.pfra_af = (*state)->af;
switch ((*state)->af) {
#ifdef INET
case AF_INET:
p.pfra_net = 32;
p.pfra_ip4addr = (*state)->src_node->addr.v4;
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
p.pfra_net = 128;
p.pfra_ip6addr = (*state)->src_node->addr.v6;
break;
#endif /* INET6 */
}
pfr_insert_kentry((*state)->rule.ptr->overload_tbl,
&p, time_second);
/* kill existing states if that's required. */
if ((*state)->rule.ptr->flush) {
pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;
RB_FOREACH(s, pf_state_tree_id, &tree_id) {
/*
* Kill states from this source. (Only those
* from the same rule if PF_FLUSH_GLOBAL is not
* set)
*/
if (s->af == (*state)->af &&
(((*state)->direction == PF_OUT &&
PF_AEQ(&(*state)->src_node->addr,
&s->lan.addr, s->af)) ||
((*state)->direction == PF_IN &&
PF_AEQ(&(*state)->src_node->addr,
&s->ext.addr, s->af))) &&
((*state)->rule.ptr->flush &
PF_FLUSH_GLOBAL ||
(*state)->rule.ptr == s->rule.ptr)) {
s->timeout = PFTM_PURGE;
s->src.state = s->dst.state =
TCPS_CLOSED;
killed++;
}
}
if (pf_status.debug >= PF_DEBUG_MISC)
printf(", %u states killed", killed);
}
if (pf_status.debug >= PF_DEBUG_MISC)
printf("\n");
}
/* kill this state */
(*state)->timeout = PFTM_PURGE;
(*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
return (1);
}
int
pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
struct pf_addr *src, sa_family_t af)
{
struct pf_src_node k;
if (*sn == NULL) {
k.af = af;
PF_ACPY(&k.addr, src, af);
if (rule->rule_flag & PFRULE_RULESRCTRACK ||
rule->rpool.opts & PF_POOL_STICKYADDR)
k.rule.ptr = rule;
else
k.rule.ptr = NULL;
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);
else
pf_status.lcounters[LCNT_SRCNODES]++;
if ((*sn) == NULL)
return (-1);
bzero(*sn, sizeof(struct pf_src_node));
pf_init_threshold(&(*sn)->conn_rate,
rule->max_src_conn_rate.limit,
rule->max_src_conn_rate.seconds);
(*sn)->af = af;
if (rule->rule_flag & PFRULE_RULESRCTRACK ||
rule->rpool.opts & PF_POOL_STICKYADDR)
(*sn)->rule.ptr = rule;
else
(*sn)->rule.ptr = NULL;
PF_ACPY(&(*sn)->addr, src, af);
if (RB_INSERT(pf_src_tree,
&tree_src_tracking, *sn) != NULL) {
if (pf_status.debug >= PF_DEBUG_MISC) {
printf("pf: src_tree insert failed: ");
pf_print_host(&(*sn)->addr, 0, af);
printf("\n");
}
pool_put(&pf_src_tree_pl, *sn);
return (-1);
}
(*sn)->creation = time_second;
(*sn)->ruletype = rule->action;
if ((*sn)->rule.ptr != NULL)
(*sn)->rule.ptr->src_nodes++;
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);
}
int
pf_insert_state(struct pfi_kif *kif, struct pf_state *state)
{
/* Thou MUST NOT insert multiple duplicate keys */
state->u.s.kif = kif;
if (RB_INSERT(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state)) {
if (pf_status.debug >= PF_DEBUG_MISC) {
printf("pf: state insert failed: tree_lan_ext");
printf(" lan: ");
pf_print_host(&state->lan.addr, state->lan.port,
state->af);
printf(" gwy: ");
pf_print_host(&state->gwy.addr, state->gwy.port,
state->af);
printf(" ext: ");
pf_print_host(&state->ext.addr, state->ext.port,
state->af);
if (state->sync_flags & PFSTATE_FROMSYNC)
printf(" (from sync)");
printf("\n");
}
return (-1);
}
if (RB_INSERT(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state)) {
if (pf_status.debug >= PF_DEBUG_MISC) {
printf("pf: state insert failed: tree_ext_gwy");
printf(" lan: ");
pf_print_host(&state->lan.addr, state->lan.port,
state->af);
printf(" gwy: ");
pf_print_host(&state->gwy.addr, state->gwy.port,
state->af);
printf(" ext: ");
pf_print_host(&state->ext.addr, state->ext.port,
state->af);
if (state->sync_flags & PFSTATE_FROMSYNC)
printf(" (from sync)");
printf("\n");
}
RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state);
return (-1);
}
if (state->id == 0 && state->creatorid == 0) {
state->id = htobe64(pf_status.stateid++);
state->creatorid = pf_status.hostid;
}
if (RB_INSERT(pf_state_tree_id, &tree_id, state) != NULL) {
if (pf_status.debug >= PF_DEBUG_MISC) {
#ifdef __OpenBSD__
printf("pf: state insert failed: "
"id: %016llx creatorid: %08x",
betoh64(state->id), ntohl(state->creatorid));
#else
printf("pf: state insert failed: "
"id: %016" PRIx64 " creatorid: %08x",
be64toh(state->id), ntohl(state->creatorid));
#endif
if (state->sync_flags & PFSTATE_FROMSYNC)
printf(" (from sync)");
printf("\n");
}
RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state);
RB_REMOVE(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state);
return (-1);
}
TAILQ_INSERT_HEAD(&state_updates, state, u.s.entry_updates);
pf_status.fcounters[FCNT_STATE_INSERT]++;
pf_status.states++;
pfi_attach_state(kif);
#if NPFSYNC
pfsync_insert_state(state);
#endif
return (0);
}
void
pf_purge_timeout(void *arg)
{
#ifdef __OpenBSD__
struct timeout *to = arg;
#else
struct callout *to = arg;
#endif
int s;
s = splsoftnet();
pf_purge_expired_states();
pf_purge_expired_fragments();
pf_purge_expired_src_nodes();
splx(s);
#ifdef __OpenBSD__
timeout_add(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz);
#else
callout_schedule(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz);
#endif
}
u_int32_t
pf_state_expires(const struct pf_state *state)
{
u_int32_t timeout;
u_int32_t start;
u_int32_t end;
u_int32_t states;
/* handle all PFTM_* > PFTM_MAX here */
if (state->timeout == PFTM_PURGE)
return (time_second);
if (state->timeout == PFTM_UNTIL_PACKET)
return (0);
KASSERT(state->timeout < PFTM_MAX);
timeout = state->rule.ptr->timeout[state->timeout];
if (!timeout)
timeout = pf_default_rule.timeout[state->timeout];
start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
if (start) {
end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
states = state->rule.ptr->states;
} 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 (state->expire + timeout * (end - states) /
(end - start));
else
return (time_second);
}
return (state->expire + timeout);
}
void
pf_purge_expired_src_nodes(void)
{
struct pf_src_node *cur, *next;
for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
if (cur->states <= 0 && cur->expire <= time_second) {
if (cur->rule.ptr != NULL) {
cur->rule.ptr->src_nodes--;
if (cur->rule.ptr->states <= 0 &&
cur->rule.ptr->max_src_nodes <= 0)
pf_rm_rule(NULL, cur->rule.ptr);
}
RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
pf_status.src_nodes--;
pool_put(&pf_src_tree_pl, cur);
}
}
}
void
pf_src_tree_remove_state(struct pf_state *s)
{
u_int32_t timeout;
if (s->src_node != NULL) {
if (s->proto == IPPROTO_TCP) {
if (s->src.state == PF_TCPS_PROXY_DST ||
s->timeout >= PFTM_TCP_ESTABLISHED)
--s->src_node->conn;
}
if (--s->src_node->states <= 0) {
timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
if (!timeout)
timeout =
pf_default_rule.timeout[PFTM_SRC_NODE];
s->src_node->expire = time_second + timeout;
}
}
if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
if (--s->nat_src_node->states <= 0) {
timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
if (!timeout)
timeout =
pf_default_rule.timeout[PFTM_SRC_NODE];
s->nat_src_node->expire = time_second + timeout;
}
}
s->src_node = s->nat_src_node = NULL;
}
void
pf_purge_expired_state(struct pf_state *cur)
{
if (cur->src.state == PF_TCPS_PROXY_DST)
pf_send_tcp(cur->rule.ptr, cur->af,
&cur->ext.addr, &cur->lan.addr,
cur->ext.port, cur->lan.port,
cur->src.seqhi, cur->src.seqlo + 1,
TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL);
RB_REMOVE(pf_state_tree_ext_gwy,
&cur->u.s.kif->pfik_ext_gwy, cur);
RB_REMOVE(pf_state_tree_lan_ext,
&cur->u.s.kif->pfik_lan_ext, cur);
RB_REMOVE(pf_state_tree_id, &tree_id, cur);
#if NPFSYNC
pfsync_delete_state(cur);
#endif
pf_src_tree_remove_state(cur);
if (--cur->rule.ptr->states <= 0 &&
cur->rule.ptr->src_nodes <= 0)
pf_rm_rule(NULL, cur->rule.ptr);
if (cur->nat_rule.ptr != NULL)
if (--cur->nat_rule.ptr->states <= 0 &&
cur->nat_rule.ptr->src_nodes <= 0)
pf_rm_rule(NULL, cur->nat_rule.ptr);
if (cur->anchor.ptr != NULL)
if (--cur->anchor.ptr->states <= 0)
pf_rm_rule(NULL, cur->anchor.ptr);
pf_normalize_tcp_cleanup(cur);
pfi_detach_state(cur->u.s.kif);
TAILQ_REMOVE(&state_updates, cur, u.s.entry_updates);
if (cur->tag)
pf_tag_unref(cur->tag);
pool_put(&pf_state_pl, cur);
pf_status.fcounters[FCNT_STATE_REMOVALS]++;
pf_status.states--;
}
void
pf_purge_expired_states(void)
{
struct pf_state *cur, *next;
for (cur = RB_MIN(pf_state_tree_id, &tree_id);
cur; cur = next) {
next = RB_NEXT(pf_state_tree_id, &tree_id, cur);
if (pf_state_expires(cur) <= time_second)
pf_purge_expired_state(cur);
}
}
int
pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
{
if (aw->type != PF_ADDR_TABLE)
return (0);
if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == 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) {
#ifdef INET
case AF_INET: {
u_int32_t a = ntohl(addr->addr32[0]);
printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
(a>>8)&255, a&255);
if (p) {
p = ntohs(p);
printf(":%u", p);
}
break;
}
#endif /* INET */
#ifdef INET6
case AF_INET6: {
u_int16_t b;
u_int8_t i, curstart = 255, curend = 0,
maxstart = 255, maxend = 255;
for (i = 0; i < 8; i++) {
if (!addr->addr16[i]) {
if (curstart == 255)
curstart = i;
else
curend = i;
} else {
if (curstart != 255) {
if ((curend - curstart) >
(maxend - maxstart)) {
maxstart = curstart;
maxend = curend;
}
curstart = 255;
}
}
}
for (i = 0; i < 8; i++) {
if (i >= maxstart && i <= maxend) {
if (maxstart == 0) {
if (i < 2)
printf(":");
} else if (maxend != 7) {
if (i == maxstart)
printf(":");
} else {
if (i == maxend)
printf(":");
}
} else {
b = ntohs(addr->addr16[i]);
printf("%x", b);
if (i < 7)
printf(":");
}
}
if (p) {
p = ntohs(p);
printf("[%u]", p);
}
break;
}
#endif /* INET6 */
}
}
void
pf_print_state(struct pf_state *s)
{
switch (s->proto) {
case IPPROTO_TCP:
printf("TCP ");
break;
case IPPROTO_UDP:
printf("UDP ");
break;
case IPPROTO_ICMP:
printf("ICMP ");
break;
case IPPROTO_ICMPV6:
printf("ICMPV6 ");
break;
default:
printf("%u ", s->proto);
break;
}
pf_print_host(&s->lan.addr, s->lan.port, s->af);
printf(" ");
pf_print_host(&s->gwy.addr, s->gwy.port, s->af);
printf(" ");
pf_print_host(&s->ext.addr, s->ext.port, s->af);
printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo,
s->src.seqhi, s->src.max_win, s->src.seqdiff);
if (s->src.wscale && s->dst.wscale)
printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK);
printf("]");
printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo,
s->dst.seqhi, s->dst.max_win, s->dst.seqdiff);
if (s->src.wscale && s->dst.wscale)
printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK);
printf("]");
printf(" %u:%u", s->src.state, s->dst.state);
}
void
pf_print_flags(u_int8_t f)
{
if (f)
printf(" ");
if (f & TH_FIN)
printf("F");
if (f & TH_SYN)
printf("S");
if (f & TH_RST)
printf("R");
if (f & TH_PUSH)
printf("P");
if (f & TH_ACK)
printf("A");
if (f & TH_URG)
printf("U");
if (f & TH_ECE)
printf("E");
if (f & TH_CWR)
printf("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->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->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.neg != prev->dst.neg ||
pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
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:
if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
return (1);
if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
return (1);
return (0);
case PF_ADDR_DYNIFTL:
return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
case PF_ADDR_NOROUTE:
return (0);
case PF_ADDR_TABLE:
return (aw1->p.tbl != aw2->p.tbl);
default:
printf("invalid address type: %d\n", aw1->type);
return (1);
}
}
u_int16_t
pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
{
u_int32_t l;
if (udp && !cksum)
return (0x0000);
l = cksum + old - new;
l = (l >> 16) + (l & 65535);
l = l & 65535;
if (udp && !l)
return (0xFFFF);
return (l);
}
void
pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
{
struct pf_addr ao;
u_int16_t po = *p;
PF_ACPY(&ao, a, af);
PF_ACPY(a, an, af);
*p = pn;
switch (af) {
#ifdef INET
case AF_INET:
*ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
ao.addr16[0], an->addr16[0], 0),
ao.addr16[1], an->addr16[1], 0);
*p = pn;
*pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
ao.addr16[0], an->addr16[0], u),
ao.addr16[1], an->addr16[1], u),
po, pn, u);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
*pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
ao.addr16[0], an->addr16[0], u),
ao.addr16[1], an->addr16[1], u),
ao.addr16[2], an->addr16[2], u),
ao.addr16[3], an->addr16[3], u),
ao.addr16[4], an->addr16[4], u),
ao.addr16[5], an->addr16[5], u),
ao.addr16[6], an->addr16[6], u),
ao.addr16[7], an->addr16[7], u),
po, pn, u);
break;
#endif /* INET6 */
}
}
/* Changes a u_int32_t. Uses a void *so there are no align restrictions */
void
pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
{
u_int32_t ao;
memcpy(&ao, a, sizeof(ao));
memcpy(a, &an, sizeof(u_int32_t));
*c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
ao % 65536, an % 65536, u);
}
#ifdef INET6
void
pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
{
struct pf_addr ao;
PF_ACPY(&ao, a, AF_INET6);
PF_ACPY(a, an, AF_INET6);
*c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(*c,
ao.addr16[0], an->addr16[0], u),
ao.addr16[1], an->addr16[1], u),
ao.addr16[2], an->addr16[2], u),
ao.addr16[3], an->addr16[3], u),
ao.addr16[4], an->addr16[4], u),
ao.addr16[5], an->addr16[5], u),
ao.addr16[6], an->addr16[6], u),
ao.addr16[7], an->addr16[7], u);
}
#endif /* INET6 */
void
pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
{
struct pf_addr oia, ooa;
PF_ACPY(&oia, ia, af);
PF_ACPY(&ooa, oa, af);
/* Change inner protocol port, fix inner protocol checksum. */
if (ip != NULL) {
u_int16_t oip = *ip;
u_int32_t opc = 0;
if (pc != NULL)
opc = *pc;
*ip = np;
if (pc != NULL)
*pc = pf_cksum_fixup(*pc, oip, *ip, u);
*ic = pf_cksum_fixup(*ic, oip, *ip, 0);
if (pc != NULL)
*ic = pf_cksum_fixup(*ic, opc, *pc, 0);
}
/* Change inner ip address, fix inner ip and icmp checksums. */
PF_ACPY(ia, na, af);
switch (af) {
#ifdef INET
case AF_INET: {
u_int32_t oh2c = *h2c;
*h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
oia.addr16[0], ia->addr16[0], 0),
oia.addr16[1], ia->addr16[1], 0);
*ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
oia.addr16[0], ia->addr16[0], 0),
oia.addr16[1], ia->addr16[1], 0);
*ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
break;
}
#endif /* INET */
#ifdef INET6
case AF_INET6:
*ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(*ic,
oia.addr16[0], ia->addr16[0], u),
oia.addr16[1], ia->addr16[1], u),
oia.addr16[2], ia->addr16[2], u),
oia.addr16[3], ia->addr16[3], u),
oia.addr16[4], ia->addr16[4], u),
oia.addr16[5], ia->addr16[5], u),
oia.addr16[6], ia->addr16[6], u),
oia.addr16[7], ia->addr16[7], u);
break;
#endif /* INET6 */
}
/* Change outer ip address, fix outer ip or icmpv6 checksum. */
PF_ACPY(oa, na, af);
switch (af) {
#ifdef INET
case AF_INET:
*hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
ooa.addr16[0], oa->addr16[0], 0),
ooa.addr16[1], oa->addr16[1], 0);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
*ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
pf_cksum_fixup(pf_cksum_fixup(*ic,
ooa.addr16[0], oa->addr16[0], u),
ooa.addr16[1], oa->addr16[1], u),
ooa.addr16[2], oa->addr16[2], u),
ooa.addr16[3], oa->addr16[3], u),
ooa.addr16[4], oa->addr16[4], u),
ooa.addr16[5], oa->addr16[5], u),
ooa.addr16[6], oa->addr16[6], u),
ooa.addr16[7], oa->addr16[7], u);
break;
#endif /* INET6 */
}
}
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, struct ether_header *eh, struct ifnet *ifp)
{
struct mbuf *m;
int len, tlen;
#ifdef INET
struct ip *h = NULL;
#endif /* INET */
#ifdef INET6
struct ip6_hdr *h6 = NULL;
#endif /* INET6 */
struct tcphdr *th;
char *opt;
/* maximum segment size tcp option */
tlen = sizeof(struct tcphdr);
if (mss)
tlen += 4;
switch (af) {
#ifdef INET
case AF_INET:
len = sizeof(struct ip) + tlen;
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
len = sizeof(struct ip6_hdr) + tlen;
break;
#endif /* INET6 */
default:
return;
}
/* create outgoing mbuf */
m = m_gethdr(M_DONTWAIT, MT_HEADER);
if (m == NULL)
return;
if (tag) {
struct m_tag *mtag;
mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT);
if (mtag == NULL) {
m_freem(m);
return;
}
m_tag_prepend(m, mtag);
}
if (rtag)
if (pf_tag_packet(m, NULL, rtag)) {
m_freem(m);
return;
}
#ifdef ALTQ
if (r != NULL && r->qid) {
struct m_tag *mtag;
struct altq_tag *atag;
mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT);
if (mtag != NULL) {
atag = (struct altq_tag *)(mtag + 1);
atag->qid = r->qid;
/* add hints for ecn */
atag->af = af;
atag->hdr = mtod(m, struct ip *);
m_tag_prepend(m, mtag);
}
}
#endif /* ALTQ */
m->m_data += max_linkhdr;
m->m_pkthdr.len = m->m_len = len;
m->m_pkthdr.rcvif = NULL;
bzero(m->m_data, len);
switch (af) {
#ifdef INET
case AF_INET:
h = mtod(m, struct ip *);
/* IP header fields included in the TCP checksum */
h->ip_p = IPPROTO_TCP;
h->ip_len = htons(tlen);
h->ip_src.s_addr = saddr->v4.s_addr;
h->ip_dst.s_addr = daddr->v4.s_addr;
th = (struct tcphdr *)((char *)h + sizeof(struct ip));
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
h6 = mtod(m, struct ip6_hdr *);
/* IP header fields included in the TCP checksum */
h6->ip6_nxt = IPPROTO_TCP;
h6->ip6_plen = htons(tlen);
memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
th = (struct tcphdr *)((char *)h6 + sizeof(struct ip6_hdr));
break;
#endif /* INET6 */
default:
m_freem(m);
return;
}
/* 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);
if (mss) {
opt = (char *)(th + 1);
opt[0] = TCPOPT_MAXSEG;
opt[1] = 4;
HTONS(mss);
bcopy((void *)&mss, (void *)(opt + 2), 2);
}
switch (af) {
#ifdef INET
case AF_INET:
/* TCP checksum */
th->th_sum = in_cksum(m, len);
/* Finish the IP header */
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;
if (eh == NULL) {
ip_output(m, (void *)NULL, (void *)NULL, 0,
(void *)NULL, (void *)NULL);
} else {
#ifdef __OpenBSD__
struct route ro;
struct rtentry rt;
struct ether_header *e = (void *)ro.ro_dst.sa_data;
if (ifp == NULL) {
m_freem(m);
return;
}
rt.rt_ifp = ifp;
ro.ro_rt = &rt;
ro.ro_dst.sa_len = sizeof(ro.ro_dst);
ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT;
bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN);
bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN);
e->ether_type = eh->ether_type;
ip_output(m, (void *)NULL, &ro, IP_ROUTETOETHER,
(void *)NULL, (void *)NULL);
#else
/*
* on netbsd, pf_test and pf_test6 are always called
* with eh == NULL.
*/
panic("pf_send_tcp: eh != NULL");
#endif
}
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
/* TCP checksum */
th->th_sum = in6_cksum(m, IPPROTO_TCP,
sizeof(struct ip6_hdr), tlen);
h6->ip6_vfc |= IPV6_VERSION;
h6->ip6_hlim = IPV6_DEFHLIM;
#ifdef __OpenBSD__
ip6_output(m, NULL, NULL, 0, NULL, NULL);
#else
ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
#endif
break;
#endif /* INET6 */
}
}
void
pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
struct pf_rule *r)
{
struct m_tag *mtag;
struct mbuf *m0;
mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT);
if (mtag == NULL)
return;
m0 = m_copy(m, 0, M_COPYALL);
if (m0 == NULL) {
m_tag_free(mtag);
return;
}
m_tag_prepend(m0, mtag);
#ifdef ALTQ
if (r->qid) {
struct altq_tag *atag;
mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT);
if (mtag != NULL) {
atag = (struct altq_tag *)(mtag + 1);
atag->qid = r->qid;
/* add hints for ecn */
atag->af = af;
atag->hdr = mtod(m0, struct ip *);
m_tag_prepend(m0, mtag);
}
}
#endif /* ALTQ */
switch (af) {
#ifdef INET
case AF_INET:
icmp_error(m0, type, code, 0, 0);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
icmp6_error(m0, type, code, 0);
break;
#endif /* INET6 */
}
}
/*
* Return 1 if the addresses a and b match (with mask m), otherwise return 0.
* If n is 0, they match if they are equal. If n is != 0, they match if they
* are different.
*/
int
pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
struct pf_addr *b, sa_family_t af)
{
int match = 0;
switch (af) {
#ifdef INET
case AF_INET:
if ((a->addr32[0] & m->addr32[0]) ==
(b->addr32[0] & m->addr32[0]))
match++;
break;
#endif /* INET */
#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])))
match++;
break;
#endif /* INET6 */
}
if (match) {
if (n)
return (0);
else
return (1);
} else {
if (n)
return (1);
else
return (0);
}
}
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)
{
NTOHS(a1);
NTOHS(a2);
NTOHS(p);
return (pf_match(op, a1, a2, p));
}
int
pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
{
if (u == UID_MAX && 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 == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
return (0);
return (pf_match(op, a1, a2, g));
}
struct pf_tag *
pf_get_tag(struct mbuf *m)
{
struct m_tag *mtag;
if ((mtag = m_tag_find(m, PACKET_TAG_PF_TAG, NULL)) != NULL)
return ((struct pf_tag *)(mtag + 1));
else
return (NULL);
}
int
pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_tag **pftag, int *tag)
{
if (*tag == -1) { /* find mbuf tag */
*pftag = pf_get_tag(m);
if (*pftag != NULL)
*tag = (*pftag)->tag;
else
*tag = 0;
}
return ((!r->match_tag_not && r->match_tag == *tag) ||
(r->match_tag_not && r->match_tag != *tag));
}
int
pf_tag_packet(struct mbuf *m, struct pf_tag *pftag, int tag)
{
struct m_tag *mtag;
if (tag <= 0)
return (0);
if (pftag == NULL) {
mtag = m_tag_get(PACKET_TAG_PF_TAG, sizeof(*pftag), M_NOWAIT);
if (mtag == NULL)
return (1);
((struct pf_tag *)(mtag + 1))->tag = tag;
m_tag_prepend(m, mtag);
} else
pftag->tag = tag;
return (0);
}
static void
pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n,
struct pf_rule **r, struct pf_rule **a)
{
struct pf_anchor_stackframe *f;
if (*depth >= sizeof(pf_anchor_stack) /
sizeof(pf_anchor_stack[0])) {
printf("pf_step_into_anchor: stack overflow\n");
*r = TAILQ_NEXT(*r, entries);
return;
} else if (*depth == 0 && a != NULL)
*a = *r;
f = pf_anchor_stack + (*depth)++;
f->rs = *rs;
f->r = *r;
if ((*r)->anchor_wildcard) {
f->parent = &(*r)->anchor->children;
if ((f->child = RB_MIN(pf_anchor_node, f->parent)) ==
NULL) {
*r = NULL;
return;
}
*rs = &f->child->ruleset;
} else {
f->parent = NULL;
f->child = NULL;
*rs = &(*r)->anchor->ruleset;
}
*r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
}
static void
pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n,
struct pf_rule **r, struct pf_rule **a)
{
struct pf_anchor_stackframe *f;
do {
if (*depth <= 0)
break;
f = pf_anchor_stack + *depth - 1;
if (f->parent != NULL && f->child != NULL) {
f->child = RB_NEXT(pf_anchor_node, f->parent, f->child);
if (f->child != NULL) {
*rs = &f->child->ruleset;
*r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
if (*r == NULL)
continue;
else
break;
}
}
(*depth)--;
if (*depth == 0 && a != NULL)
*a = NULL;
*rs = f->rs;
*r = TAILQ_NEXT(f->r, entries);
} while (*r == NULL);
}
#ifdef INET6
void
pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
struct pf_addr *rmask, const struct pf_addr *saddr, sa_family_t af)
{
switch (af) {
#ifdef INET
case AF_INET:
naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
break;
#endif /* INET */
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;
}
}
void
pf_addr_inc(struct pf_addr *addr, sa_family_t af)
{
switch (af) {
#ifdef INET
case AF_INET:
addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
break;
#endif /* INET */
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 */
#define mix(a,b,c) \
do { \
a -= b; a -= c; a ^= (c >> 13); \
b -= c; b -= a; b ^= (a << 8); \
c -= a; c -= b; c ^= (b >> 13); \
a -= b; a -= c; a ^= (c >> 12); \
b -= c; b -= a; b ^= (a << 16); \
c -= a; c -= b; c ^= (b >> 5); \
a -= b; a -= c; a ^= (c >> 3); \
b -= c; b -= a; b ^= (a << 10); \
c -= a; c -= b; c ^= (b >> 15); \
} while (0)
/*
* hash function based on bridge_hash in if_bridge.c
*/
void
pf_hash(const struct pf_addr *inaddr, struct pf_addr *hash,
struct pf_poolhashkey *key, sa_family_t af)
{
u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
switch (af) {
#ifdef INET
case AF_INET:
a += inaddr->addr32[0];
b += key->key32[1];
mix(a, b, c);
hash->addr32[0] = c + key->key32[2];
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
a += inaddr->addr32[0];
b += inaddr->addr32[2];
mix(a, b, c);
hash->addr32[0] = c;
a += inaddr->addr32[1];
b += inaddr->addr32[3];
c += key->key32[1];
mix(a, b, c);
hash->addr32[1] = c;
a += inaddr->addr32[2];
b += inaddr->addr32[1];
c += key->key32[2];
mix(a, b, c);
hash->addr32[2] = c;
a += inaddr->addr32[3];
b += inaddr->addr32[0];
c += key->key32[3];
mix(a, b, c);
hash->addr32[3] = c;
break;
#endif /* INET6 */
}
}
int
pf_map_addr(sa_family_t af, struct pf_rule *r, const struct pf_addr *saddr,
struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
{
unsigned char hash[16];
struct pf_pool *rpool = &r->rpool;
struct pf_addr *raddr = &rpool->cur->addr.v.a.addr;
struct pf_addr *rmask = &rpool->cur->addr.v.a.mask;
struct pf_pooladdr *acur = rpool->cur;
struct pf_src_node k;
if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
(r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
k.af = af;
PF_ACPY(&k.addr, saddr, af);
if (r->rule_flag & PFRULE_RULESRCTRACK ||
r->rpool.opts & PF_POOL_STICKYADDR)
k.rule.ptr = r;
else
k.rule.ptr = NULL;
pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
*sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
PF_ACPY(naddr, &(*sn)->raddr, af);
if (pf_status.debug >= PF_DEBUG_MISC) {
printf("pf_map_addr: src tracking maps ");
pf_print_host(&k.addr, 0, af);
printf(" to ");
pf_print_host(naddr, 0, af);
printf("\n");
}
return (0);
}
}
if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
return (1);
if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
switch (af) {
#ifdef INET
case AF_INET:
if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
(rpool->opts & PF_POOL_TYPEMASK) !=
PF_POOL_ROUNDROBIN)
return (1);
raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
(rpool->opts & PF_POOL_TYPEMASK) !=
PF_POOL_ROUNDROBIN)
return (1);
raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
break;
#endif /* INET6 */
}
} else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
return (1); /* unsupported */
} else {
raddr = &rpool->cur->addr.v.a.addr;
rmask = &rpool->cur->addr.v.a.mask;
}
switch (rpool->opts & PF_POOL_TYPEMASK) {
case PF_POOL_NONE:
PF_ACPY(naddr, raddr, af);
break;
case PF_POOL_BITMASK:
PF_POOLMASK(naddr, raddr, rmask, saddr, af);
break;
case PF_POOL_RANDOM:
if (init_addr != NULL && PF_AZERO(init_addr, af)) {
switch (af) {
#ifdef INET
case AF_INET:
rpool->counter.addr32[0] = htonl(arc4random());
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
if (rmask->addr32[3] != 0xffffffff)
rpool->counter.addr32[3] =
htonl(arc4random());
else
break;
if (rmask->addr32[2] != 0xffffffff)
rpool->counter.addr32[2] =
htonl(arc4random());
else
break;
if (rmask->addr32[1] != 0xffffffff)
rpool->counter.addr32[1] =
htonl(arc4random());
else
break;
if (rmask->addr32[0] != 0xffffffff)
rpool->counter.addr32[0] =
htonl(arc4random());
break;
#endif /* INET6 */
}
PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
PF_ACPY(init_addr, naddr, af);
} else {
PF_AINC(&rpool->counter, af);
PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
}
break;
case PF_POOL_SRCHASH:
pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
break;
case PF_POOL_ROUNDROBIN:
if (rpool->cur->addr.type == PF_ADDR_TABLE) {
if (!pfr_pool_get(rpool->cur->addr.p.tbl,
&rpool->tblidx, &rpool->counter,
&raddr, &rmask, af))
goto get_addr;
} else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
&rpool->tblidx, &rpool->counter,
&raddr, &rmask, af))
goto get_addr;
} else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
goto get_addr;
try_next:
if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
rpool->cur = TAILQ_FIRST(&rpool->list);
if (rpool->cur->addr.type == PF_ADDR_TABLE) {
rpool->tblidx = -1;
if (pfr_pool_get(rpool->cur->addr.p.tbl,
&rpool->tblidx, &rpool->counter,
&raddr, &rmask, af)) {
/* table contains no address of type 'af' */
if (rpool->cur != acur)
goto try_next;
return (1);
}
} else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
rpool->tblidx = -1;
if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
&rpool->tblidx, &rpool->counter,
&raddr, &rmask, af)) {
/* table contains no address of type 'af' */
if (rpool->cur != acur)
goto try_next;
return (1);
}
} else {
raddr = &rpool->cur->addr.v.a.addr;
rmask = &rpool->cur->addr.v.a.mask;
PF_ACPY(&rpool->counter, raddr, af);
}
get_addr:
PF_ACPY(naddr, &rpool->counter, af);
if (init_addr != NULL && PF_AZERO(init_addr, af))
PF_ACPY(init_addr, naddr, af);
PF_AINC(&rpool->counter, af);
break;
}
if (*sn != NULL)
PF_ACPY(&(*sn)->raddr, naddr, af);
if (pf_status.debug >= PF_DEBUG_MISC &&
(rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
printf("pf_map_addr: selected address ");
pf_print_host(naddr, 0, af);
printf("\n");
}
return (0);
}
int
pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
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;
struct pf_addr init_addr;
u_int16_t cut;
bzero(&init_addr, sizeof(init_addr));
if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
return (1);
do {
key.af = af;
key.proto = proto;
PF_ACPY(&key.ext.addr, daddr, key.af);
PF_ACPY(&key.gwy.addr, naddr, key.af);
key.ext.port = dport;
/*
* port search; start random, step;
* similar 2 portloop in in_pcbbind
*/
if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP)) {
key.gwy.port = dport;
if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL)
return (0);
} else if (low == 0 && high == 0) {
key.gwy.port = *nport;
if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL)
return (0);
} else if (low == high) {
key.gwy.port = htons(low);
if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) {
*nport = htons(low);
return (0);
}
} else {
u_int16_t tmp;
if (low > high) {
tmp = low;
low = high;
high = tmp;
}
/* low < high */
cut = htonl(arc4random()) % (1 + high - low) + low;
/* low <= cut <= high */
for (tmp = cut; tmp <= high; ++(tmp)) {
key.gwy.port = htons(tmp);
if (pf_find_state_all(&key, PF_EXT_GWY, NULL) ==
NULL) {
*nport = htons(tmp);
return (0);
}
}
for (tmp = cut - 1; tmp >= low; --(tmp)) {
key.gwy.port = htons(tmp);
if (pf_find_state_all(&key, PF_EXT_GWY, NULL) ==
NULL) {
*nport = htons(tmp);
return (0);
}
}
}
switch (r->rpool.opts & PF_POOL_TYPEMASK) {
case PF_POOL_RANDOM:
case PF_POOL_ROUNDROBIN:
if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
return (1);
break;
case PF_POOL_NONE:
case PF_POOL_SRCHASH:
case PF_POOL_BITMASK:
default:
return (1);
}
} while (! PF_AEQ(&init_addr, naddr, af) );
return (1); /* none available */
}
struct pf_rule *
pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
struct pf_addr *daddr, u_int16_t dport, int rs_num)
{
struct pf_rule *r, *rm = NULL;
struct pf_ruleset *ruleset = NULL;
struct pf_tag *pftag = NULL;
int tag = -1;
int asd = 0;
r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
while (r && rm == NULL) {
struct pf_rule_addr *src = NULL, *dst = NULL;
struct pf_addr_wrap *xdst = NULL;
if (r->action == PF_BINAT && direction == PF_IN) {
src = &r->dst;
if (r->rpool.cur != NULL)
xdst = &r->rpool.cur->addr;
} else {
src = &r->src;
dst = &r->dst;
}
r->evaluations++;
if (r->kif != NULL &&
(r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
r = r->skip[PF_SKIP_IFP].ptr;
else if (r->direction && r->direction != direction)
r = r->skip[PF_SKIP_DIR].ptr;
else if (r->af && r->af != pd->af)
r = r->skip[PF_SKIP_AF].ptr;
else if (r->proto && r->proto != pd->proto)
r = r->skip[PF_SKIP_PROTO].ptr;
else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, src->neg))
r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
PF_SKIP_DST_ADDR].ptr;
else if (src->port_op && !pf_match_port(src->port_op,
src->port[0], src->port[1], sport))
r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
PF_SKIP_DST_PORT].ptr;
else if (dst != NULL &&
PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg))
r = r->skip[PF_SKIP_DST_ADDR].ptr;
else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 0))
r = TAILQ_NEXT(r, entries);
else if (dst != NULL && dst->port_op &&
!pf_match_port(dst->port_op, dst->port[0],
dst->port[1], dport))
r = r->skip[PF_SKIP_DST_PORT].ptr;
else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag))
r = TAILQ_NEXT(r, entries);
else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
off, pd->hdr.tcp), r->os_fingerprint)))
r = TAILQ_NEXT(r, entries);
else {
if (r->tag)
tag = r->tag;
if (r->anchor == NULL) {
rm = r;
} else
pf_step_into_anchor(&asd, &ruleset, rs_num, &r, NULL);
}
if (r == NULL)
pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, NULL);
}
if (pf_tag_packet(m, pftag, tag))
return (NULL);
if (rm != NULL && (rm->action == PF_NONAT ||
rm->action == PF_NORDR || rm->action == PF_NOBINAT))
return (NULL);
return (rm);
}
struct pf_rule *
pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
struct pfi_kif *kif, struct pf_src_node **sn,
struct pf_addr *saddr, u_int16_t sport,
struct pf_addr *daddr, u_int16_t dport,
struct pf_addr *naddr, u_int16_t *nport)
{
struct pf_rule *r = NULL;
if (direction == PF_OUT) {
r = pf_match_translation(pd, m, off, direction, kif, saddr,
sport, daddr, dport, PF_RULESET_BINAT);
if (r == NULL)
r = pf_match_translation(pd, m, off, direction, kif,
saddr, sport, daddr, dport, PF_RULESET_NAT);
} else {
r = pf_match_translation(pd, m, off, direction, kif, saddr,
sport, daddr, dport, PF_RULESET_RDR);
if (r == NULL)
r = pf_match_translation(pd, m, off, direction, kif,
saddr, sport, daddr, dport, PF_RULESET_BINAT);
}
if (r != NULL) {
switch (r->action) {
case PF_NONAT:
case PF_NOBINAT:
case PF_NORDR:
return (NULL);
case PF_NAT:
if (pf_get_sport(pd->af, pd->proto, r, saddr,
daddr, dport, naddr, nport, r->rpool.proxy_port[0],
r->rpool.proxy_port[1], sn)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: NAT proxy port allocation "
"(%u-%u) failed\n",
r->rpool.proxy_port[0],
r->rpool.proxy_port[1]));
return (NULL);
}
break;
case PF_BINAT:
switch (direction) {
case PF_OUT:
if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
switch (pd->af) {
#ifdef INET
case AF_INET:
if (r->rpool.cur->addr.p.dyn->
pfid_acnt4 < 1)
return (NULL);
PF_POOLMASK(naddr,
&r->rpool.cur->addr.p.dyn->
pfid_addr4,
&r->rpool.cur->addr.p.dyn->
pfid_mask4,
saddr, AF_INET);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
if (r->rpool.cur->addr.p.dyn->
pfid_acnt6 < 1)
return (NULL);
PF_POOLMASK(naddr,
&r->rpool.cur->addr.p.dyn->
pfid_addr6,
&r->rpool.cur->addr.p.dyn->
pfid_mask6,
saddr, AF_INET6);
break;
#endif /* INET6 */
}
} else
PF_POOLMASK(naddr,
&r->rpool.cur->addr.v.a.addr,
&r->rpool.cur->addr.v.a.mask,
saddr, pd->af);
break;
case PF_IN:
if (r->src.addr.type == PF_ADDR_DYNIFTL) {
switch (pd->af) {
#ifdef INET
case AF_INET:
if (r->src.addr.p.dyn->
pfid_acnt4 < 1)
return (NULL);
PF_POOLMASK(naddr,
&r->src.addr.p.dyn->
pfid_addr4,
&r->src.addr.p.dyn->
pfid_mask4,
daddr, AF_INET);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
if (r->src.addr.p.dyn->
pfid_acnt6 < 1)
return (NULL);
PF_POOLMASK(naddr,
&r->src.addr.p.dyn->
pfid_addr6,
&r->src.addr.p.dyn->
pfid_mask6,
daddr, AF_INET6);
break;
#endif /* INET6 */
}
} else
PF_POOLMASK(naddr,
&r->src.addr.v.a.addr,
&r->src.addr.v.a.mask, daddr,
pd->af);
break;
}
break;
case PF_RDR: {
if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
return (NULL);
if (r->rpool.proxy_port[1]) {
u_int32_t tmp_nport;
tmp_nport = ((ntohs(dport) -
ntohs(r->dst.port[0])) %
(r->rpool.proxy_port[1] -
r->rpool.proxy_port[0] + 1)) +
r->rpool.proxy_port[0];
/* wrap around if necessary */
if (tmp_nport > 65535)
tmp_nport -= 65535;
*nport = htons((u_int16_t)tmp_nport);
} else if (r->rpool.proxy_port[0])
*nport = htons(r->rpool.proxy_port[0]);
break;
}
default:
return (NULL);
}
}
return (r);
}
int
pf_socket_lookup(uid_t *uid, gid_t *gid, int direction, struct pf_pdesc *pd)
{
struct pf_addr *saddr, *daddr;
u_int16_t sport, dport;
struct inpcbtable *tb;
struct inpcb *inp = NULL;
#if defined(__NetBSD__) && defined(INET6)
struct in6pcb *in6p = NULL;
#endif
*uid = UID_MAX;
*gid = GID_MAX;
switch (pd->proto) {
case IPPROTO_TCP:
sport = pd->hdr.tcp->th_sport;
dport = pd->hdr.tcp->th_dport;
tb = &tcbtable;
break;
case IPPROTO_UDP:
sport = pd->hdr.udp->uh_sport;
dport = pd->hdr.udp->uh_dport;
tb = &udbtable;
break;
default:
return (0);
}
if (direction == 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) {
#ifdef INET
case AF_INET:
#ifdef __OpenBSD__
inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport);
if (inp == NULL) {
inp = in_pcblookup_listen(tb, daddr->v4, dport, 0);
if (inp == NULL)
return (0);
}
#else
inp = in_pcblookup_connect(tb, saddr->v4, sport, daddr->v4,
dport);
if (inp == NULL) {
inp = in_pcblookup_bind(tb, daddr->v4, dport);
if (inp == NULL)
return (0);
}
#endif
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
#ifdef __OpenBSD__
inp = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6,
dport);
if (inp == NULL) {
inp = in6_pcblookup_listen(tb, &daddr->v6, dport, 0);
if (inp == NULL)
return (0);
}
#else
in6p = in6_pcblookup_connect(tb, &saddr->v6, sport, &daddr->v6,
dport, 0);
if (in6p == NULL) {
in6p = in6_pcblookup_bind(tb, &daddr->v6, dport, 0);
if (in6p == NULL)
return (0);
}
#endif
break;
#endif /* INET6 */
default:
return (0);
}
#ifdef __OpenBSD__
*uid = inp->inp_socket->so_euid;
*gid = inp->inp_socket->so_egid;
#else
switch (pd->af) {
case AF_INET:
*uid = inp->inp_socket->so_uidinfo->ui_uid;
/* XXX gid */
break;
#ifdef INET6
case AF_INET6:
*uid = in6p->in6p_socket->so_uidinfo->ui_uid;
/* XXX gid */
break;
#endif
}
#endif
return (1);
}
u_int8_t
pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
{
int hlen;
u_int8_t hdr[60];
u_int8_t *opt, optlen;
u_int8_t wscale = 0;
hlen = th_off << 2; /* hlen <= sizeof(hdr) */
if (hlen <= sizeof(struct tcphdr))
return (0);
if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
return (0);
opt = hdr + sizeof(struct tcphdr);
hlen -= sizeof(struct tcphdr);
while (hlen >= 3) {
switch (*opt) {
case TCPOPT_EOL:
case TCPOPT_NOP:
++opt;
--hlen;
break;
case TCPOPT_WINDOW:
wscale = opt[2];
if (wscale > TCP_MAX_WINSHIFT)
wscale = TCP_MAX_WINSHIFT;
wscale |= PF_WSCALE_FLAG;
/* FALLTHROUGH */
default:
optlen = opt[1];
if (optlen < 2)
optlen = 2;
hlen -= optlen;
opt += optlen;
break;
}
}
return (wscale);
}
u_int16_t
pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
{
int hlen;
u_int8_t hdr[60];
u_int8_t *opt, optlen;
u_int16_t mss = tcp_mssdflt;
hlen = th_off << 2; /* hlen <= sizeof(hdr) */
if (hlen <= sizeof(struct tcphdr))
return (0);
if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
return (0);
opt = hdr + sizeof(struct tcphdr);
hlen -= sizeof(struct tcphdr);
while (hlen >= TCPOLEN_MAXSEG) {
switch (*opt) {
case TCPOPT_EOL:
case TCPOPT_NOP:
++opt;
--hlen;
break;
case TCPOPT_MAXSEG:
bcopy((void *)(opt + 2), (void *)&mss, 2);
NTOHS(mss);
/* FALLTHROUGH */
default:
optlen = opt[1];
if (optlen < 2)
optlen = 2;
hlen -= optlen;
opt += optlen;
break;
}
}
return (mss);
}
u_int16_t
pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
{
struct route *rop = NULL;
#ifdef INET
struct sockaddr_in *dst;
struct route ro;
#endif /* INET */
#ifdef INET6
struct sockaddr_in6 *dst6;
struct route_in6 ro6;
#endif /* INET6 */
int hlen;
u_int16_t mss = tcp_mssdflt;
hlen = 0; /* XXXGCC - -Wunitialized m68k */
switch (af) {
#ifdef INET
case AF_INET:
hlen = sizeof(struct ip);
bzero(&ro, sizeof(ro));
dst = (struct sockaddr_in *)&ro.ro_dst;
dst->sin_family = AF_INET;
dst->sin_len = sizeof(*dst);
dst->sin_addr = addr->v4;
rop = &ro;
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
hlen = sizeof(struct ip6_hdr);
bzero(&ro6, sizeof(ro6));
dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
dst6->sin6_family = AF_INET6;
dst6->sin6_len = sizeof(*dst6);
dst6->sin6_addr = addr->v6;
rop = (struct route *)&ro6;
break;
#endif /* INET6 */
}
#ifdef __OpenBSD__
rtalloc_noclone(rop, NO_CLONING);
#else
rtcache_init_noclone(rop);
#endif
if (rop->ro_rt != NULL) {
mss = rop->ro_rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
mss = max(tcp_mssdflt, mss);
}
rtcache_free(rop);
mss = min(mss, offer);
mss = max(mss, 64); /* sanity - at least max opt space */
return (mss);
}
void
pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
{
struct pf_rule *r = s->rule.ptr;
s->rt_kif = NULL;
if (!r->rt || r->rt == PF_FASTROUTE)
return;
switch (s->af) {
#ifdef INET
case AF_INET:
pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
&s->nat_src_node);
s->rt_kif = r->rpool.cur->kif;
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
&s->nat_src_node);
s->rt_kif = r->rpool.cur->kif;
break;
#endif /* INET6 */
}
}
int
pf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction,
struct pfi_kif *kif, struct mbuf *m, int off, void *h,
struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
struct ifqueue *ifq)
{
struct pf_rule *nr = NULL;
struct pf_addr *saddr = pd->src, *daddr = pd->dst;
struct tcphdr *th = pd->hdr.tcp;
u_int16_t bport, nport = 0;
sa_family_t af = pd->af;
int lookup = -1;
uid_t uid = 0; /* XXX: GCC */
gid_t gid = 0; /* XXX: GCC */
struct pf_rule *r, *a = NULL;
struct pf_ruleset *ruleset = NULL;
struct pf_src_node *nsn = NULL;
u_short reason;
int rewrite = 0;
struct pf_tag *pftag = NULL;
int tag = -1;
u_int16_t mss = tcp_mssdflt;
int asd = 0;
if (pf_check_congestion(ifq)) {
REASON_SET(&reason, PFRES_CONGEST);
return (PF_DROP);
}
r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
if (direction == PF_OUT) {
bport = nport = th->th_sport;
/* check outgoing packet for BINAT/NAT */
if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
saddr, th->th_sport, daddr, th->th_dport,
&pd->naddr, &nport)) != NULL) {
PF_ACPY(&pd->baddr, saddr, af);
pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
&th->th_sum, &pd->naddr, nport, 0, af);
rewrite++;
if (nr->natpass)
r = NULL;
pd->nat_rule = nr;
}
} else {
bport = nport = th->th_dport;
/* check incoming packet for BINAT/RDR */
if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
saddr, th->th_sport, daddr, th->th_dport,
&pd->naddr, &nport)) != NULL) {
PF_ACPY(&pd->baddr, daddr, af);
pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
&th->th_sum, &pd->naddr, nport, 0, af);
rewrite++;
if (nr->natpass)
r = NULL;
pd->nat_rule = nr;
}
}
while (r != NULL) {
r->evaluations++;
if (r->kif != NULL &&
(r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
r = r->skip[PF_SKIP_IFP].ptr;
else if (r->direction && r->direction != direction)
r = r->skip[PF_SKIP_DIR].ptr;
else if (r->af && r->af != af)
r = r->skip[PF_SKIP_AF].ptr;
else if (r->proto && r->proto != IPPROTO_TCP)
r = r->skip[PF_SKIP_PROTO].ptr;
else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg))
r = r->skip[PF_SKIP_SRC_ADDR].ptr;
else if (r->src.port_op && !pf_match_port(r->src.port_op,
r->src.port[0], r->src.port[1], th->th_sport))
r = r->skip[PF_SKIP_SRC_PORT].ptr;
else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg))
r = r->skip[PF_SKIP_DST_ADDR].ptr;
else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
r->dst.port[0], r->dst.port[1], th->th_dport))
r = r->skip[PF_SKIP_DST_PORT].ptr;
else if (r->tos && !(r->tos & pd->tos))
r = TAILQ_NEXT(r, entries);
else if (r->rule_flag & PFRULE_FRAGMENT)
r = TAILQ_NEXT(r, entries);
else if ((r->flagset & th->th_flags) != r->flags)
r = TAILQ_NEXT(r, entries);
else if (r->uid.op && (lookup != -1 || (lookup =
pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
!pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
uid))
r = TAILQ_NEXT(r, entries);
else if (r->gid.op && (lookup != -1 || (lookup =
pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
!pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
gid))
r = TAILQ_NEXT(r, entries);
else if (r->prob && r->prob <= arc4random())
r = TAILQ_NEXT(r, entries);
else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag))
r = TAILQ_NEXT(r, entries);
else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match(
pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint))
r = TAILQ_NEXT(r, entries);
else {
if (r->tag)
tag = r->tag;
if (r->anchor == NULL) {
*rm = r;
*am = a;
*rsm = ruleset;
if ((*rm)->quick)
break;
r = TAILQ_NEXT(r, entries);
} else
pf_step_into_anchor(&asd, &ruleset,
PF_RULESET_FILTER, &r, &a);
}
if (r == NULL)
pf_step_out_of_anchor(&asd, &ruleset,
PF_RULESET_FILTER, &r, &a);
}
r = *rm;
a = *am;
ruleset = *rsm;
REASON_SET(&reason, PFRES_MATCH);
if (r->log) {
if (rewrite)
m_copyback(m, off, sizeof(*th), th);
PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
}
if ((r->action == PF_DROP) &&
((r->rule_flag & PFRULE_RETURNRST) ||
(r->rule_flag & PFRULE_RETURNICMP) ||
(r->rule_flag & PFRULE_RETURN))) {
/* undo NAT changes, if they have taken place */
if (nr != NULL) {
if (direction == PF_OUT) {
pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
&th->th_sum, &pd->baddr, bport, 0, af);
rewrite++;
} else {
pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
&th->th_sum, &pd->baddr, bport, 0, af);
rewrite++;
}
}
if (((r->rule_flag & PFRULE_RETURNRST) ||
(r->rule_flag & PFRULE_RETURN)) &&
!(th->th_flags & TH_RST)) {
u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
if (th->th_flags & TH_SYN)
ack++;
if (th->th_flags & TH_FIN)
ack++;
pf_send_tcp(r, af, pd->dst,
pd->src, th->th_dport, th->th_sport,
ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp);
} else if ((af == AF_INET) && r->return_icmp)
pf_send_icmp(m, r->return_icmp >> 8,
r->return_icmp & 255, af, r);
else if ((af == AF_INET6) && r->return_icmp6)
pf_send_icmp(m, r->return_icmp6 >> 8,
r->return_icmp6 & 255, af, r);
}
if (r->action == PF_DROP)
return (PF_DROP);
if (pf_tag_packet(m, pftag, tag)) {
REASON_SET(&reason, PFRES_MEMORY);
return (PF_DROP);
}
if (r->keep_state || nr != NULL ||
(pd->flags & PFDESC_TCP_NORM)) {
/* create new state */
u_int16_t len;
struct pf_state *s = NULL;
struct pf_src_node *sn = NULL;
len = pd->tot_len - off - (th->th_off << 2);
/* check maximums */
if (r->max_states && (r->states >= r->max_states)) {
pf_status.lcounters[LCNT_STATES]++;
REASON_SET(&reason, PFRES_MAXSTATES);
goto cleanup;
}
/* src node for flter rule */
if ((r->rule_flag & PFRULE_SRCTRACK ||
r->rpool.opts & PF_POOL_STICKYADDR) &&
pf_insert_src_node(&sn, r, saddr, af) != 0) {
REASON_SET(&reason, PFRES_SRCLIMIT);
goto cleanup;
}
/* src node for translation rule */
if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
((direction == PF_OUT &&
pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
(pf_insert_src_node(&nsn, nr, saddr, af) != 0))) {
REASON_SET(&reason, PFRES_SRCLIMIT);
goto cleanup;
}
s = pool_get(&pf_state_pl, PR_NOWAIT);
if (s == NULL) {
REASON_SET(&reason, PFRES_MEMORY);
cleanup:
if (sn != NULL && sn->states == 0 && sn->expire == 0) {
RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
pf_status.src_nodes--;
pool_put(&pf_src_tree_pl, sn);
}
if (nsn != sn && nsn != NULL && nsn->states == 0 &&
nsn->expire == 0) {
RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
pf_status.src_nodes--;
pool_put(&pf_src_tree_pl, nsn);
}
return (PF_DROP);
}
bzero(s, sizeof(*s));
s->rule.ptr = r;
s->nat_rule.ptr = nr;
s->anchor.ptr = a;
STATE_INC_COUNTERS(s);
s->allow_opts = r->allow_opts;
s->log = r->log & 2;
s->proto = IPPROTO_TCP;
s->direction = direction;
s->af = af;
if (direction == PF_OUT) {
PF_ACPY(&s->gwy.addr, saddr, af);
s->gwy.port = th->th_sport; /* sport */
PF_ACPY(&s->ext.addr, daddr, af);
s->ext.port = th->th_dport;
if (nr != NULL) {
PF_ACPY(&s->lan.addr, &pd->baddr, af);
s->lan.port = bport;
} else {
PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
s->lan.port = s->gwy.port;
}
} else {
PF_ACPY(&s->lan.addr, daddr, af);
s->lan.port = th->th_dport;
PF_ACPY(&s->ext.addr, saddr, af);
s->ext.port = th->th_sport;
if (nr != NULL) {
PF_ACPY(&s->gwy.addr, &pd->baddr, af);
s->gwy.port = bport;
} else {
PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
s->gwy.port = s->lan.port;
}
}
s->src.seqlo = ntohl(th->th_seq);
s->src.seqhi = s->src.seqlo + len + 1;
if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
r->keep_state == PF_STATE_MODULATE) {
/* Generate sequence number modulator */
while ((s->src.seqdiff = htonl(arc4random())) == 0)
;
pf_change_a(&th->th_seq, &th->th_sum,
htonl(s->src.seqlo + s->src.seqdiff), 0);
rewrite = 1;
} else
s->src.seqdiff = 0;
s->src.max_win = MAX(ntohs(th->th_win), 1);
if (th->th_flags & TH_SYN) {
s->src.seqhi++;
s->src.wscale = pf_get_wscale(m, off, th->th_off, af);
} else if (s->src.wscale & PF_WSCALE_MASK) {
/* Remove scale factor from initial window */
u_int win = s->src.max_win;
win += 1 << (s->src.wscale & PF_WSCALE_MASK);
s->src.max_win = (win - 1) >>
(s->src.wscale & PF_WSCALE_MASK);
}
if (th->th_flags & TH_FIN)
s->src.seqhi++;
s->dst.seqhi = 1;
s->dst.max_win = 1;
s->src.state = TCPS_SYN_SENT;
s->dst.state = TCPS_CLOSED;
s->creation = time_second;
s->expire = time_second;
s->timeout = PFTM_TCP_FIRST_PACKET;
pf_set_rt_ifp(s, saddr);
if (sn != NULL) {
s->src_node = sn;
s->src_node->states++;
}
if (nsn != NULL) {
PF_ACPY(&nsn->raddr, &pd->naddr, af);
s->nat_src_node = nsn;
s->nat_src_node->states++;
}
if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
off, pd, th, &s->src, &s->dst)) {
REASON_SET(&reason, PFRES_MEMORY);
pf_src_tree_remove_state(s);
STATE_DEC_COUNTERS(s);
pool_put(&pf_state_pl, s);
return (PF_DROP);
}
if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
&s->src, &s->dst, &rewrite)) {
/* This really shouldn't happen!!! */
DPFPRINTF(PF_DEBUG_URGENT,
("pf_normalize_tcp_stateful failed on first pkt"));
pf_normalize_tcp_cleanup(s);
pf_src_tree_remove_state(s);
STATE_DEC_COUNTERS(s);
pool_put(&pf_state_pl, s);
return (PF_DROP);
}
if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
pf_normalize_tcp_cleanup(s);
REASON_SET(&reason, PFRES_STATEINS);
pf_src_tree_remove_state(s);
STATE_DEC_COUNTERS(s);
pool_put(&pf_state_pl, s);
return (PF_DROP);
} else
*sm = s;
if (tag > 0) {
pf_tag_ref(tag);
s->tag = tag;
}
if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
r->keep_state == PF_STATE_SYNPROXY) {
s->src.state = PF_TCPS_PROXY_SRC;
if (nr != NULL) {
if (direction == PF_OUT) {
pf_change_ap(saddr, &th->th_sport,
pd->ip_sum, &th->th_sum, &pd->baddr,
bport, 0, af);
} else {
pf_change_ap(daddr, &th->th_dport,
pd->ip_sum, &th->th_sum, &pd->baddr,
bport, 0, af);
}
}
s->src.seqhi = htonl(arc4random());
/* Find mss option */
mss = pf_get_mss(m, off, th->th_off, af);
mss = pf_calc_mss(saddr, af, mss);
mss = pf_calc_mss(daddr, af, mss);
s->src.mss = mss;
pf_send_tcp(r, af, daddr, saddr, th->th_dport,
th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL);
REASON_SET(&reason, PFRES_SYNPROXY);
return (PF_SYNPROXY_DROP);
}
}
/* copy back packet headers if we performed NAT operations */
if (rewrite)
m_copyback(m, off, sizeof(*th), th);
return (PF_PASS);
}
int
pf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction,
struct pfi_kif *kif, struct mbuf *m, int off, void *h,
struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
struct ifqueue *ifq)
{
struct pf_rule *nr = NULL;
struct pf_addr *saddr = pd->src, *daddr = pd->dst;
struct udphdr *uh = pd->hdr.udp;
u_int16_t bport, nport = 0;
sa_family_t af = pd->af;
int lookup = -1;
uid_t uid = 0; /* XXX: GCC */
gid_t gid = 0; /* XXX: GCC */
struct pf_rule *r, *a = NULL;
struct pf_ruleset *ruleset = NULL;
struct pf_src_node *nsn = NULL;
u_short reason;
int rewrite = 0;
struct pf_tag *pftag = NULL;
int tag = -1;
int asd = 0;
if (pf_check_congestion(ifq)) {
REASON_SET(&reason, PFRES_CONGEST);
return (PF_DROP);
}
r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
if (direction == PF_OUT) {
bport = nport = uh->uh_sport;
/* check outgoing packet for BINAT/NAT */
if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
saddr, uh->uh_sport, daddr, uh->uh_dport,
&pd->naddr, &nport)) != NULL) {
PF_ACPY(&pd->baddr, saddr, af);
pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
&uh->uh_sum, &pd->naddr, nport, 1, af);
rewrite++;
if (nr->natpass)
r = NULL;
pd->nat_rule = nr;
}
} else {
bport = nport = uh->uh_dport;
/* check incoming packet for BINAT/RDR */
if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr,
&nport)) != NULL) {
PF_ACPY(&pd->baddr, daddr, af);
pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
&uh->uh_sum, &pd->naddr, nport, 1, af);
rewrite++;
if (nr->natpass)
r = NULL;
pd->nat_rule = nr;
}
}
while (r != NULL) {
r->evaluations++;
if (r->kif != NULL &&
(r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
r = r->skip[PF_SKIP_IFP].ptr;
else if (r->direction && r->direction != direction)
r = r->skip[PF_SKIP_DIR].ptr;
else if (r->af && r->af != af)
r = r->skip[PF_SKIP_AF].ptr;
else if (r->proto && r->proto != IPPROTO_UDP)
r = r->skip[PF_SKIP_PROTO].ptr;
else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg))
r = r->skip[PF_SKIP_SRC_ADDR].ptr;
else if (r->src.port_op && !pf_match_port(r->src.port_op,
r->src.port[0], r->src.port[1], uh->uh_sport))
r = r->skip[PF_SKIP_SRC_PORT].ptr;
else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg))
r = r->skip[PF_SKIP_DST_ADDR].ptr;
else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
r->dst.port[0], r->dst.port[1], uh->uh_dport))
r = r->skip[PF_SKIP_DST_PORT].ptr;
else if (r->tos && !(r->tos & pd->tos))
r = TAILQ_NEXT(r, entries);
else if (r->rule_flag & PFRULE_FRAGMENT)
r = TAILQ_NEXT(r, entries);
else if (r->uid.op && (lookup != -1 || (lookup =
pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
!pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
uid))
r = TAILQ_NEXT(r, entries);
else if (r->gid.op && (lookup != -1 || (lookup =
pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
!pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
gid))
r = TAILQ_NEXT(r, entries);
else if (r->prob && r->prob <= arc4random())
r = TAILQ_NEXT(r, entries);
else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag))
r = TAILQ_NEXT(r, entries);
else if (r->os_fingerprint != PF_OSFP_ANY)
r = TAILQ_NEXT(r, entries);
else {
if (r->tag)
tag = r->tag;
if (r->anchor == NULL) {
*rm = r;
*am = a;
*rsm = ruleset;
if ((*rm)->quick)
break;
r = TAILQ_NEXT(r, entries);
} else
pf_step_into_anchor(&asd, &ruleset,
PF_RULESET_FILTER, &r, &a);
}
if (r == NULL)
pf_step_out_of_anchor(&asd, &ruleset,
PF_RULESET_FILTER, &r, &a);
}
r = *rm;
a = *am;
ruleset = *rsm;
REASON_SET(&reason, PFRES_MATCH);
if (r->log) {
if (rewrite)
m_copyback(m, off, sizeof(*uh), uh);
PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
}
if ((r->action == PF_DROP) &&
((r->rule_flag & PFRULE_RETURNICMP) ||
(r->rule_flag & PFRULE_RETURN))) {
/* undo NAT changes, if they have taken place */
if (nr != NULL) {
if (direction == PF_OUT) {
pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
&uh->uh_sum, &pd->baddr, bport, 1, af);
rewrite++;
} else {
pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
&uh->uh_sum, &pd->baddr, bport, 1, af);
rewrite++;
}
}
if ((af == AF_INET) && r->return_icmp)
pf_send_icmp(m, r->return_icmp >> 8,
r->return_icmp & 255, af, r);
else if ((af == AF_INET6) && r->return_icmp6)
pf_send_icmp(m, r->return_icmp6 >> 8,
r->return_icmp6 & 255, af, r);
}
if (r->action == PF_DROP)
return (PF_DROP);
if (pf_tag_packet(m, pftag, tag)) {
REASON_SET(&reason, PFRES_MEMORY);
return (PF_DROP);
}
if (r->keep_state || nr != NULL) {
/* create new state */
struct pf_state *s = NULL;
struct pf_src_node *sn = NULL;
/* check maximums */
if (r->max_states && (r->states >= r->max_states)) {
pf_status.lcounters[LCNT_STATES]++;
REASON_SET(&reason, PFRES_MAXSTATES);
goto cleanup;
}
/* src node for flter rule */
if ((r->rule_flag & PFRULE_SRCTRACK ||
r->rpool.opts & PF_POOL_STICKYADDR) &&
pf_insert_src_node(&sn, r, saddr, af) != 0) {
REASON_SET(&reason, PFRES_SRCLIMIT);
goto cleanup;
}
/* src node for translation rule */
if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
((direction == PF_OUT &&
pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
(pf_insert_src_node(&nsn, nr, saddr, af) != 0))) {
REASON_SET(&reason, PFRES_SRCLIMIT);
goto cleanup;
}
s = pool_get(&pf_state_pl, PR_NOWAIT);
if (s == NULL) {
REASON_SET(&reason, PFRES_MEMORY);
cleanup:
if (sn != NULL && sn->states == 0 && sn->expire == 0) {
RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
pf_status.src_nodes--;
pool_put(&pf_src_tree_pl, sn);
}
if (nsn != sn && nsn != NULL && nsn->states == 0 &&
nsn->expire == 0) {
RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
pf_status.src_nodes--;
pool_put(&pf_src_tree_pl, nsn);
}
return (PF_DROP);
}
bzero(s, sizeof(*s));
s->rule.ptr = r;
s->nat_rule.ptr = nr;
s->anchor.ptr = a;
STATE_INC_COUNTERS(s);
s->allow_opts = r->allow_opts;
s->log = r->log & 2;
s->proto = IPPROTO_UDP;
s->direction = direction;
s->af = af;
if (direction == PF_OUT) {
PF_ACPY(&s->gwy.addr, saddr, af);
s->gwy.port = uh->uh_sport;
PF_ACPY(&s->ext.addr, daddr, af);
s->ext.port = uh->uh_dport;
if (nr != NULL) {
PF_ACPY(&s->lan.addr, &pd->baddr, af);
s->lan.port = bport;
} else {
PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
s->lan.port = s->gwy.port;
}
} else {
PF_ACPY(&s->lan.addr, daddr, af);
s->lan.port = uh->uh_dport;
PF_ACPY(&s->ext.addr, saddr, af);
s->ext.port = uh->uh_sport;
if (nr != NULL) {
PF_ACPY(&s->gwy.addr, &pd->baddr, af);
s->gwy.port = bport;
} else {
PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
s->gwy.port = s->lan.port;
}
}
s->src.state = PFUDPS_SINGLE;
s->dst.state = PFUDPS_NO_TRAFFIC;
s->creation = time_second;
s->expire = time_second;
s->timeout = PFTM_UDP_FIRST_PACKET;
pf_set_rt_ifp(s, saddr);
if (sn != NULL) {
s->src_node = sn;
s->src_node->states++;
}
if (nsn != NULL) {
PF_ACPY(&nsn->raddr, &pd->naddr, af);
s->nat_src_node = nsn;
s->nat_src_node->states++;
}
if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
REASON_SET(&reason, PFRES_STATEINS);
pf_src_tree_remove_state(s);
STATE_DEC_COUNTERS(s);
pool_put(&pf_state_pl, s);
return (PF_DROP);
} else
*sm = s;
if (tag > 0) {
pf_tag_ref(tag);
s->tag = tag;
}
}
/* copy back packet headers if we performed NAT operations */
if (rewrite)
m_copyback(m, off, sizeof(*uh), uh);
return (PF_PASS);
}
int
pf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction,
struct pfi_kif *kif, struct mbuf *m, int off, void *h,
struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
struct ifqueue *ifq)
{
struct pf_rule *nr = NULL;
struct pf_addr *saddr = pd->src, *daddr = pd->dst;
struct pf_rule *r, *a = NULL;
struct pf_ruleset *ruleset = NULL;
struct pf_src_node *nsn = NULL;
u_short reason;
u_int16_t icmpid = 0;
sa_family_t af = pd->af;
u_int8_t icmptype = 0, icmpcode = 0;
int state_icmp = 0;
struct pf_tag *pftag = NULL;
int tag = -1;
#ifdef INET6
int rewrite = 0;
#endif /* INET6 */
int asd = 0;
if (pf_check_congestion(ifq)) {
REASON_SET(&reason, PFRES_CONGEST);
return (PF_DROP);
}
switch (pd->proto) {
#ifdef INET
case IPPROTO_ICMP:
icmptype = pd->hdr.icmp->icmp_type;
icmpcode = pd->hdr.icmp->icmp_code;
icmpid = pd->hdr.icmp->icmp_id;
if (icmptype == ICMP_UNREACH ||
icmptype == ICMP_SOURCEQUENCH ||
icmptype == ICMP_REDIRECT ||
icmptype == ICMP_TIMXCEED ||
icmptype == ICMP_PARAMPROB)
state_icmp++;
break;
#endif /* INET */
#ifdef INET6
case IPPROTO_ICMPV6:
icmptype = pd->hdr.icmp6->icmp6_type;
icmpcode = pd->hdr.icmp6->icmp6_code;
icmpid = pd->hdr.icmp6->icmp6_id;
if (icmptype == ICMP6_DST_UNREACH ||
icmptype == ICMP6_PACKET_TOO_BIG ||
icmptype == ICMP6_TIME_EXCEEDED ||
icmptype == ICMP6_PARAM_PROB)
state_icmp++;
break;
#endif /* INET6 */
}
r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
if (direction == PF_OUT) {
/* check outgoing packet for BINAT/NAT */
if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
saddr, icmpid, daddr, icmpid, &pd->naddr, NULL)) != NULL) {
PF_ACPY(&pd->baddr, saddr, af);
switch (af) {
#ifdef INET
case AF_INET:
pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
pd->naddr.v4.s_addr, 0);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
&pd->naddr, 0);
rewrite++;
break;
#endif /* INET6 */
}
if (nr->natpass)
r = NULL;
pd->nat_rule = nr;
}
} else {
/* check incoming packet for BINAT/RDR */
if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
saddr, icmpid, daddr, icmpid, &pd->naddr, NULL)) != NULL) {
PF_ACPY(&pd->baddr, daddr, af);
switch (af) {
#ifdef INET
case AF_INET:
pf_change_a(&daddr->v4.s_addr,
pd->ip_sum, pd->naddr.v4.s_addr, 0);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
&pd->naddr, 0);
rewrite++;
break;
#endif /* INET6 */
}
if (nr->natpass)
r = NULL;
pd->nat_rule = nr;
}
}
while (r != NULL) {
r->evaluations++;
if (r->kif != NULL &&
(r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
r = r->skip[PF_SKIP_IFP].ptr;
else if (r->direction && r->direction != direction)
r = r->skip[PF_SKIP_DIR].ptr;
else if (r->af && r->af != af)
r = r->skip[PF_SKIP_AF].ptr;
else if (r->proto && r->proto != pd->proto)
r = r->skip[PF_SKIP_PROTO].ptr;
else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg))
r = r->skip[PF_SKIP_SRC_ADDR].ptr;
else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg))
r = r->skip[PF_SKIP_DST_ADDR].ptr;
else if (r->type && r->type != icmptype + 1)
r = TAILQ_NEXT(r, entries);
else if (r->code && r->code != icmpcode + 1)
r = TAILQ_NEXT(r, entries);
else if (r->tos && !(r->tos & pd->tos))
r = TAILQ_NEXT(r, entries);
else if (r->rule_flag & PFRULE_FRAGMENT)
r = TAILQ_NEXT(r, entries);
else if (r->prob && r->prob <= arc4random())
r = TAILQ_NEXT(r, entries);
else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag))
r = TAILQ_NEXT(r, entries);
else if (r->os_fingerprint != PF_OSFP_ANY)
r = TAILQ_NEXT(r, entries);
else {
if (r->tag)
tag = r->tag;
if (r->anchor == NULL) {
*rm = r;
*am = a;
*rsm = ruleset;
if ((*rm)->quick)
break;
r = TAILQ_NEXT(r, entries);
} else
pf_step_into_anchor(&asd, &ruleset,
PF_RULESET_FILTER, &r, &a);
}
if (r == NULL)
pf_step_out_of_anchor(&asd, &ruleset,
PF_RULESET_FILTER, &r, &a);
}
r = *rm;
a = *am;
ruleset = *rsm;
REASON_SET(&reason, PFRES_MATCH);
if (r->log) {
#ifdef INET6
if (rewrite)
m_copyback(m, off, sizeof(struct icmp6_hdr),
pd->hdr.icmp6);
#endif /* INET6 */
PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
}
if (r->action != PF_PASS)
return (PF_DROP);
if (pf_tag_packet(m, pftag, tag)) {
REASON_SET(&reason, PFRES_MEMORY);
return (PF_DROP);
}
if (!state_icmp && (r->keep_state || nr != NULL)) {
/* create new state */
struct pf_state *s = NULL;
struct pf_src_node *sn = NULL;
/* check maximums */
if (r->max_states && (r->states >= r->max_states)) {
pf_status.lcounters[LCNT_STATES]++;
REASON_SET(&reason, PFRES_MAXSTATES);
goto cleanup;
}
/* src node for flter rule */
if ((r->rule_flag & PFRULE_SRCTRACK ||
r->rpool.opts & PF_POOL_STICKYADDR) &&
pf_insert_src_node(&sn, r, saddr, af) != 0) {
REASON_SET(&reason, PFRES_SRCLIMIT);
goto cleanup;
}
/* src node for translation rule */
if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
((direction == PF_OUT &&
pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
(pf_insert_src_node(&nsn, nr, saddr, af) != 0))) {
REASON_SET(&reason, PFRES_SRCLIMIT);
goto cleanup;
}
s = pool_get(&pf_state_pl, PR_NOWAIT);
if (s == NULL) {
REASON_SET(&reason, PFRES_MEMORY);
cleanup:
if (sn != NULL && sn->states == 0 && sn->expire == 0) {
RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
pf_status.src_nodes--;
pool_put(&pf_src_tree_pl, sn);
}
if (nsn != sn && nsn != NULL && nsn->states == 0 &&
nsn->expire == 0) {
RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
pf_status.src_nodes--;
pool_put(&pf_src_tree_pl, nsn);
}
return (PF_DROP);
}
bzero(s, sizeof(*s));
s->rule.ptr = r;
s->nat_rule.ptr = nr;
s->anchor.ptr = a;
STATE_INC_COUNTERS(s);
s->allow_opts = r->allow_opts;
s->log = r->log & 2;
s->proto = pd->proto;
s->direction = direction;
s->af = af;
if (direction == PF_OUT) {
PF_ACPY(&s->gwy.addr, saddr, af);
s->gwy.port = icmpid;
PF_ACPY(&s->ext.addr, daddr, af);
s->ext.port = icmpid;
if (nr != NULL)
PF_ACPY(&s->lan.addr, &pd->baddr, af);
else
PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
s->lan.port = icmpid;
} else {
PF_ACPY(&s->lan.addr, daddr, af);
s->lan.port = icmpid;
PF_ACPY(&s->ext.addr, saddr, af);
s->ext.port = icmpid;
if (nr != NULL)
PF_ACPY(&s->gwy.addr, &pd->baddr, af);
else
PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
s->gwy.port = icmpid;
}
s->creation = time_second;
s->expire = time_second;
s->timeout = PFTM_ICMP_FIRST_PACKET;
pf_set_rt_ifp(s, saddr);
if (sn != NULL) {
s->src_node = sn;
s->src_node->states++;
}
if (nsn != NULL) {
PF_ACPY(&nsn->raddr, &pd->naddr, af);
s->nat_src_node = nsn;
s->nat_src_node->states++;
}
if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
REASON_SET(&reason, PFRES_STATEINS);
pf_src_tree_remove_state(s);
STATE_DEC_COUNTERS(s);
pool_put(&pf_state_pl, s);
return (PF_DROP);
} else
*sm = s;
if (tag > 0) {
pf_tag_ref(tag);
s->tag = tag;
}
}
#ifdef INET6
/* copy back packet headers if we performed IPv6 NAT operations */
if (rewrite)
m_copyback(m, off, sizeof(struct icmp6_hdr),
pd->hdr.icmp6);
#endif /* INET6 */
return (PF_PASS);
}
int
pf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction,
struct pfi_kif *kif, struct mbuf *m, int off, void *h,
struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
struct ifqueue *ifq)
{
struct pf_rule *nr = NULL;
struct pf_rule *r, *a = NULL;
struct pf_ruleset *ruleset = NULL;
struct pf_src_node *nsn = NULL;
struct pf_addr *saddr = pd->src, *daddr = pd->dst;
sa_family_t af = pd->af;
u_short reason;
struct pf_tag *pftag = NULL;
int tag = -1;
int asd = 0;
if (pf_check_congestion(ifq)) {
REASON_SET(&reason, PFRES_CONGEST);
return (PF_DROP);
}
r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
if (direction == PF_OUT) {
/* check outgoing packet for BINAT/NAT */
if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
PF_ACPY(&pd->baddr, saddr, af);
switch (af) {
#ifdef INET
case AF_INET:
pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
pd->naddr.v4.s_addr, 0);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
PF_ACPY(saddr, &pd->naddr, af);
break;
#endif /* INET6 */
}
if (nr->natpass)
r = NULL;
pd->nat_rule = nr;
}
} else {
/* check incoming packet for BINAT/RDR */
if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
PF_ACPY(&pd->baddr, daddr, af);
switch (af) {
#ifdef INET
case AF_INET:
pf_change_a(&daddr->v4.s_addr,
pd->ip_sum, pd->naddr.v4.s_addr, 0);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
PF_ACPY(daddr, &pd->naddr, af);
break;
#endif /* INET6 */
}
if (nr->natpass)
r = NULL;
pd->nat_rule = nr;
}
}
while (r != NULL) {
r->evaluations++;
if (r->kif != NULL &&
(r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
r = r->skip[PF_SKIP_IFP].ptr;
else if (r->direction && r->direction != direction)
r = r->skip[PF_SKIP_DIR].ptr;
else if (r->af && r->af != af)
r = r->skip[PF_SKIP_AF].ptr;
else if (r->proto && r->proto != pd->proto)
r = r->skip[PF_SKIP_PROTO].ptr;
else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.neg))
r = r->skip[PF_SKIP_SRC_ADDR].ptr;
else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.neg))
r = r->skip[PF_SKIP_DST_ADDR].ptr;
else if (r->tos && !(r->tos & pd->tos))
r = TAILQ_NEXT(r, entries);
else if (r->rule_flag & PFRULE_FRAGMENT)
r = TAILQ_NEXT(r, entries);
else if (r->prob && r->prob <= arc4random())
r = TAILQ_NEXT(r, entries);
else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag))
r = TAILQ_NEXT(r, entries);
else if (r->os_fingerprint != PF_OSFP_ANY)
r = TAILQ_NEXT(r, entries);
else {
if (r->tag)
tag = r->tag;
if (r->anchor == NULL) {
*rm = r;
*am = a;
*rsm = ruleset;
if ((*rm)->quick)
break;
r = TAILQ_NEXT(r, entries);
} else
pf_step_into_anchor(&asd, &ruleset,
PF_RULESET_FILTER, &r, &a);
}
if (r == NULL)
pf_step_out_of_anchor(&asd, &ruleset,
PF_RULESET_FILTER, &r, &a);
}
r = *rm;
a = *am;
ruleset = *rsm;
REASON_SET(&reason, PFRES_MATCH);
if (r->log)
PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
if ((r->action == PF_DROP) &&
((r->rule_flag & PFRULE_RETURNICMP) ||
(r->rule_flag & PFRULE_RETURN))) {
struct pf_addr *a = NULL;
if (nr != NULL) {
if (direction == PF_OUT)
a = saddr;
else
a = daddr;
}
if (a != NULL) {
switch (af) {
#ifdef INET
case AF_INET:
pf_change_a(&a->v4.s_addr, pd->ip_sum,
pd->baddr.v4.s_addr, 0);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
PF_ACPY(a, &pd->baddr, af);
break;
#endif /* INET6 */
}
}
if ((af == AF_INET) && r->return_icmp)
pf_send_icmp(m, r->return_icmp >> 8,
r->return_icmp & 255, af, r);
else if ((af == AF_INET6) && r->return_icmp6)
pf_send_icmp(m, r->return_icmp6 >> 8,
r->return_icmp6 & 255, af, r);
}
if (r->action != PF_PASS)
return (PF_DROP);
if (pf_tag_packet(m, pftag, tag)) {
REASON_SET(&reason, PFRES_MEMORY);
return (PF_DROP);
}
if (r->keep_state || nr != NULL) {
/* create new state */
struct pf_state *s = NULL;
struct pf_src_node *sn = NULL;
/* check maximums */
if (r->max_states && (r->states >= r->max_states)) {
pf_status.lcounters[LCNT_STATES]++;
REASON_SET(&reason, PFRES_MAXSTATES);
goto cleanup;
}
/* src node for flter rule */
if ((r->rule_flag & PFRULE_SRCTRACK ||
r->rpool.opts & PF_POOL_STICKYADDR) &&
pf_insert_src_node(&sn, r, saddr, af) != 0) {
REASON_SET(&reason, PFRES_SRCLIMIT);
goto cleanup;
}
/* src node for translation rule */
if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
((direction == PF_OUT &&
pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
(pf_insert_src_node(&nsn, nr, saddr, af) != 0))) {
REASON_SET(&reason, PFRES_SRCLIMIT);
goto cleanup;
}
s = pool_get(&pf_state_pl, PR_NOWAIT);
if (s == NULL) {
REASON_SET(&reason, PFRES_MEMORY);
cleanup:
if (sn != NULL && sn->states == 0 && sn->expire == 0) {
RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
pf_status.src_nodes--;
pool_put(&pf_src_tree_pl, sn);
}
if (nsn != sn && nsn != NULL && nsn->states == 0 &&
nsn->expire == 0) {
RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
pf_status.src_nodes--;
pool_put(&pf_src_tree_pl, nsn);
}
return (PF_DROP);
}
bzero(s, sizeof(*s));
s->rule.ptr = r;
s->nat_rule.ptr = nr;
s->anchor.ptr = a;
STATE_INC_COUNTERS(s);
s->allow_opts = r->allow_opts;
s->log = r->log & 2;
s->proto = pd->proto;
s->direction = direction;
s->af = af;
if (direction == PF_OUT) {
PF_ACPY(&s->gwy.addr, saddr, af);
PF_ACPY(&s->ext.addr, daddr, af);
if (nr != NULL)
PF_ACPY(&s->lan.addr, &pd->baddr, af);
else
PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
} else {
PF_ACPY(&s->lan.addr, daddr, af);
PF_ACPY(&s->ext.addr, saddr, af);
if (nr != NULL)
PF_ACPY(&s->gwy.addr, &pd->baddr, af);
else
PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
}
s->src.state = PFOTHERS_SINGLE;
s->dst.state = PFOTHERS_NO_TRAFFIC;
s->creation = time_second;
s->expire = time_second;
s->timeout = PFTM_OTHER_FIRST_PACKET;
pf_set_rt_ifp(s, saddr);
if (sn != NULL) {
s->src_node = sn;
s->src_node->states++;
}
if (nsn != NULL) {
PF_ACPY(&nsn->raddr, &pd->naddr, af);
s->nat_src_node = nsn;
s->nat_src_node->states++;
}
if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
REASON_SET(&reason, PFRES_STATEINS);
pf_src_tree_remove_state(s);
STATE_DEC_COUNTERS(s);
pool_put(&pf_state_pl, s);
return (PF_DROP);
} else
*sm = s;
if (tag > 0) {
pf_tag_ref(tag);
s->tag = tag;
}
}
return (PF_PASS);
}
int
pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
struct pf_ruleset **rsm)
{
struct pf_rule *r, *a = NULL;
struct pf_ruleset *ruleset = NULL;
sa_family_t af = pd->af;
u_short reason;
struct pf_tag *pftag = NULL;
int tag = -1;
int asd = 0;
r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
while (r != NULL) {
r->evaluations++;
if (r->kif != NULL &&
(r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
r = r->skip[PF_SKIP_IFP].ptr;
else if (r->direction && r->direction != direction)
r = r->skip[PF_SKIP_DIR].ptr;
else if (r->af && r->af != af)
r = r->skip[PF_SKIP_AF].ptr;
else if (r->proto && r->proto != pd->proto)
r = r->skip[PF_SKIP_PROTO].ptr;
else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.neg))
r = r->skip[PF_SKIP_SRC_ADDR].ptr;
else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.neg))
r = r->skip[PF_SKIP_DST_ADDR].ptr;
else if (r->tos && !(r->tos & pd->tos))
r = TAILQ_NEXT(r, entries);
else if (r->src.port_op || r->dst.port_op ||
r->flagset || r->type || r->code ||
r->os_fingerprint != PF_OSFP_ANY)
r = TAILQ_NEXT(r, entries);
else if (r->prob && r->prob <= arc4random())
r = TAILQ_NEXT(r, entries);
else if (r->match_tag && !pf_match_tag(m, r, &pftag, &tag))
r = TAILQ_NEXT(r, entries);
else {
if (r->anchor == NULL) {
*rm = r;
*am = a;
*rsm = ruleset;
if ((*rm)->quick)
break;
r = TAILQ_NEXT(r, entries);
} else
pf_step_into_anchor(&asd, &ruleset,
PF_RULESET_FILTER, &r, &a);
}
if (r == NULL)
pf_step_out_of_anchor(&asd, &ruleset,
PF_RULESET_FILTER, &r, &a);
}
r = *rm;
a = *am;
ruleset = *rsm;
REASON_SET(&reason, PFRES_MATCH);
if (r->log)
PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
if (r->action != PF_PASS)
return (PF_DROP);
if (pf_tag_packet(m, pftag, tag)) {
REASON_SET(&reason, PFRES_MEMORY);
return (PF_DROP);
}
return (PF_PASS);
}
int
pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
u_short *reason)
{
struct pf_state key;
struct tcphdr *th = pd->hdr.tcp;
u_int16_t win = ntohs(th->th_win);
u_int32_t ack, end, seq, orig_seq;
u_int8_t sws, dws;
int ackskew;
int copyback = 0;
struct pf_state_peer *src, *dst;
key.af = pd->af;
key.proto = IPPROTO_TCP;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd->src, key.af);
PF_ACPY(&key.gwy.addr, pd->dst, key.af);
key.ext.port = th->th_sport;
key.gwy.port = th->th_dport;
} else {
PF_ACPY(&key.lan.addr, pd->src, key.af);
PF_ACPY(&key.ext.addr, pd->dst, key.af);
key.lan.port = th->th_sport;
key.ext.port = th->th_dport;
}
STATE_LOOKUP();
if (direction == (*state)->direction) {
src = &(*state)->src;
dst = &(*state)->dst;
} else {
src = &(*state)->dst;
dst = &(*state)->src;
}
if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
if (direction != (*state)->direction) {
REASON_SET(reason, PFRES_SYNPROXY);
return (PF_SYNPROXY_DROP);
}
if (th->th_flags & TH_SYN) {
if (ntohl(th->th_seq) != (*state)->src.seqlo) {
REASON_SET(reason, PFRES_SYNPROXY);
return (PF_DROP);
}
pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
pd->src, th->th_dport, th->th_sport,
(*state)->src.seqhi, ntohl(th->th_seq) + 1,
TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1,
0, NULL, NULL);
REASON_SET(reason, PFRES_SYNPROXY);
return (PF_SYNPROXY_DROP);
} else if (!(th->th_flags & TH_ACK) ||
(ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
(ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
REASON_SET(reason, PFRES_SYNPROXY);
return (PF_DROP);
} else if ((*state)->src_node != NULL &&
pf_src_connlimit(state)) {
REASON_SET(reason, PFRES_SRCLIMIT);
return (PF_DROP);
} else
(*state)->src.state = PF_TCPS_PROXY_DST;
}
if ((*state)->src.state == PF_TCPS_PROXY_DST) {
struct pf_state_host *src, *dst;
if (direction == PF_OUT) {
src = &(*state)->gwy;
dst = &(*state)->ext;
} else {
src = &(*state)->ext;
dst = &(*state)->lan;
}
if (direction == (*state)->direction) {
if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
(ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
(ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
REASON_SET(reason, PFRES_SYNPROXY);
return (PF_DROP);
}
(*state)->src.max_win = MAX(ntohs(th->th_win), 1);
if ((*state)->dst.seqhi == 1)
(*state)->dst.seqhi = htonl(arc4random());
pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
&dst->addr, src->port, dst->port,
(*state)->dst.seqhi, 0, TH_SYN, 0,
(*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL);
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) != (*state)->dst.seqhi + 1)) {
REASON_SET(reason, PFRES_SYNPROXY);
return (PF_DROP);
} else {
(*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
(*state)->dst.seqlo = ntohl(th->th_seq);
pf_send_tcp((*state)->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, (*state)->src.max_win, 0, 0, 0,
(*state)->tag, NULL, NULL);
pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
&dst->addr, src->port, dst->port,
(*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
TH_ACK, (*state)->dst.max_win, 0, 0, 1,
0, NULL, NULL);
(*state)->src.seqdiff = (*state)->dst.seqhi -
(*state)->src.seqlo;
(*state)->dst.seqdiff = (*state)->src.seqhi -
(*state)->dst.seqlo;
(*state)->src.seqhi = (*state)->src.seqlo +
(*state)->dst.max_win;
(*state)->dst.seqhi = (*state)->dst.seqlo +
(*state)->src.max_win;
(*state)->src.wscale = (*state)->dst.wscale = 0;
(*state)->src.state = (*state)->dst.state =
TCPS_ESTABLISHED;
REASON_SET(reason, PFRES_SYNPROXY);
return (PF_SYNPROXY_DROP);
}
}
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 ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
src->scrub == NULL) {
if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
REASON_SET(reason, PFRES_MEMORY);
return (PF_DROP);
}
}
/* Deferred generation of sequence number modulator */
if (dst->seqdiff && !src->seqdiff) {
while ((src->seqdiff = htonl(arc4random())) == 0)
;
ack = ntohl(th->th_ack) - dst->seqdiff;
pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
src->seqdiff), 0);
pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
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(m, off, th->th_off,
pd->af);
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 <<= dst->wscale &
PF_WSCALE_MASK;
/* in case of a retrans SYN|ACK */
dst->wscale = 0;
}
}
}
if (th->th_flags & TH_FIN)
end++;
src->seqlo = seq;
if (src->state < TCPS_SYN_SENT)
src->state = 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_change_a(&th->th_seq, &th->th_sum, htonl(seq +
src->seqdiff), 0);
pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
copyback = 1;
}
end = seq + pd->p_len;
if (th->th_flags & TH_SYN)
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;
end = seq;
}
ackskew = dst->seqlo - ack;
#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */
if (SEQ_GEQ(src->seqhi, 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 ||
(pd->flags & PFDESC_IP_REAS) == 0)) {
/* Require an exact sequence match on resets when possible */
if (dst->scrub || src->scrub) {
if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
*state, 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)
src->state = TCPS_SYN_SENT;
if (th->th_flags & TH_FIN)
if (src->state < TCPS_CLOSING)
src->state = TCPS_CLOSING;
if (th->th_flags & TH_ACK) {
if (dst->state == TCPS_SYN_SENT) {
dst->state = TCPS_ESTABLISHED;
if (src->state == TCPS_ESTABLISHED &&
(*state)->src_node != NULL &&
pf_src_connlimit(state)) {
REASON_SET(reason, PFRES_SRCLIMIT);
return (PF_DROP);
}
} else if (dst->state == TCPS_CLOSING)
dst->state = TCPS_FIN_WAIT_2;
}
if (th->th_flags & TH_RST)
src->state = dst->state = TCPS_TIME_WAIT;
/* update expire time */
(*state)->expire = time_second;
if (src->state >= TCPS_FIN_WAIT_2 &&
dst->state >= TCPS_FIN_WAIT_2)
(*state)->timeout = PFTM_TCP_CLOSED;
else if (src->state >= TCPS_FIN_WAIT_2 ||
dst->state >= TCPS_FIN_WAIT_2)
(*state)->timeout = PFTM_TCP_FIN_WAIT;
else if (src->state < TCPS_ESTABLISHED ||
dst->state < TCPS_ESTABLISHED)
(*state)->timeout = PFTM_TCP_OPENING;
else if (src->state >= TCPS_CLOSING ||
dst->state >= TCPS_CLOSING)
(*state)->timeout = PFTM_TCP_CLOSING;
else
(*state)->timeout = 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, 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 >= PF_DEBUG_MISC) {
printf("pf: loose state match: ");
pf_print_state(*state);
pf_print_flags(th->th_flags);
printf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d\n",
seq, ack, pd->p_len, ackskew,
(*state)->packets[0], (*state)->packets[1]);
}
if (dst->scrub || src->scrub) {
if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
*state, 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)
src->state = TCPS_CLOSING;
if (th->th_flags & TH_RST)
src->state = dst->state = TCPS_TIME_WAIT;
/* Fall through to PASS packet */
} else {
if ((*state)->dst.state == TCPS_SYN_SENT &&
(*state)->src.state == TCPS_SYN_SENT) {
/* Send RST for state mismatches during handshake */
if (!(th->th_flags & TH_RST))
pf_send_tcp((*state)->rule.ptr, pd->af,
pd->dst, pd->src, th->th_dport,
th->th_sport, ntohl(th->th_ack), 0,
TH_RST, 0, 0,
(*state)->rule.ptr->return_ttl, 1, 0,
pd->eh, kif->pfik_ifp);
src->seqlo = 0;
src->seqhi = 1;
src->max_win = 1;
} else if (pf_status.debug >= PF_DEBUG_MISC) {
printf("pf: BAD state: ");
pf_print_state(*state);
pf_print_flags(th->th_flags);
printf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d "
"dir=%s,%s\n", seq, ack, pd->p_len, ackskew,
(*state)->packets[0], (*state)->packets[1],
direction == PF_IN ? "in" : "out",
direction == (*state)->direction ? "fwd" : "rev");
printf("pf: State failure on: %c %c %c %c | %c %c\n",
SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
' ': '2',
(ackskew >= -MAXACKWINDOW) ? ' ' : '3',
(ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
}
REASON_SET(reason, PFRES_BADSTATE);
return (PF_DROP);
}
/* Any packets which have gotten here are to be passed */
/* translate source/destination address, if necessary */
if (STATE_TRANSLATE(*state)) {
if (direction == PF_OUT)
pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
&th->th_sum, &(*state)->gwy.addr,
(*state)->gwy.port, 0, pd->af);
else
pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
&th->th_sum, &(*state)->lan.addr,
(*state)->lan.port, 0, pd->af);
m_copyback(m, off, sizeof(*th), th);
} else if (copyback) {
/* Copyback sequence modulation or stateful scrub changes */
m_copyback(m, off, sizeof(*th), th);
}
return (PF_PASS);
}
int
pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
{
struct pf_state_peer *src, *dst;
struct pf_state key;
struct udphdr *uh = pd->hdr.udp;
key.af = pd->af;
key.proto = IPPROTO_UDP;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd->src, key.af);
PF_ACPY(&key.gwy.addr, pd->dst, key.af);
key.ext.port = uh->uh_sport;
key.gwy.port = uh->uh_dport;
} else {
PF_ACPY(&key.lan.addr, pd->src, key.af);
PF_ACPY(&key.ext.addr, pd->dst, key.af);
key.lan.port = uh->uh_sport;
key.ext.port = uh->uh_dport;
}
STATE_LOOKUP();
if (direction == (*state)->direction) {
src = &(*state)->src;
dst = &(*state)->dst;
} else {
src = &(*state)->dst;
dst = &(*state)->src;
}
/* update states */
if (src->state < PFUDPS_SINGLE)
src->state = PFUDPS_SINGLE;
if (dst->state == PFUDPS_SINGLE)
dst->state = PFUDPS_MULTIPLE;
/* update expire time */
(*state)->expire = time_second;
if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
(*state)->timeout = PFTM_UDP_MULTIPLE;
else
(*state)->timeout = PFTM_UDP_SINGLE;
/* translate source/destination address, if necessary */
if (STATE_TRANSLATE(*state)) {
if (direction == PF_OUT)
pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
&uh->uh_sum, &(*state)->gwy.addr,
(*state)->gwy.port, 1, pd->af);
else
pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
&uh->uh_sum, &(*state)->lan.addr,
(*state)->lan.port, 1, pd->af);
m_copyback(m, off, sizeof(*uh), uh);
}
return (PF_PASS);
}
int
pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
u_short *reason)
{
struct pf_addr *saddr = pd->src, *daddr = pd->dst;
u_int16_t icmpid = 0, *icmpsum;
u_int8_t icmptype;
int state_icmp = 0;
icmpsum = NULL; /* XXXGCC -Wunitialized m68k */
icmptype = 0; /* XXXGCC -Wunitialized m68k */
switch (pd->proto) {
#ifdef INET
case IPPROTO_ICMP:
icmptype = pd->hdr.icmp->icmp_type;
icmpid = pd->hdr.icmp->icmp_id;
icmpsum = &pd->hdr.icmp->icmp_cksum;
if (icmptype == ICMP_UNREACH ||
icmptype == ICMP_SOURCEQUENCH ||
icmptype == ICMP_REDIRECT ||
icmptype == ICMP_TIMXCEED ||
icmptype == ICMP_PARAMPROB)
state_icmp++;
break;
#endif /* INET */
#ifdef INET6
case IPPROTO_ICMPV6:
icmptype = pd->hdr.icmp6->icmp6_type;
icmpid = pd->hdr.icmp6->icmp6_id;
icmpsum = &pd->hdr.icmp6->icmp6_cksum;
if (icmptype == ICMP6_DST_UNREACH ||
icmptype == ICMP6_PACKET_TOO_BIG ||
icmptype == ICMP6_TIME_EXCEEDED ||
icmptype == ICMP6_PARAM_PROB)
state_icmp++;
break;
#endif /* INET6 */
}
if (!state_icmp) {
/*
* ICMP query/reply message not related to a TCP/UDP packet.
* Search for an ICMP state.
*/
struct pf_state key;
key.af = pd->af;
key.proto = pd->proto;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd->src, key.af);
PF_ACPY(&key.gwy.addr, pd->dst, key.af);
key.ext.port = icmpid;
key.gwy.port = icmpid;
} else {
PF_ACPY(&key.lan.addr, pd->src, key.af);
PF_ACPY(&key.ext.addr, pd->dst, key.af);
key.lan.port = icmpid;
key.ext.port = icmpid;
}
STATE_LOOKUP();
(*state)->expire = time_second;
(*state)->timeout = PFTM_ICMP_ERROR_REPLY;
/* translate source/destination address, if necessary */
if (PF_ANEQ(&(*state)->lan.addr, &(*state)->gwy.addr, pd->af)) {
if (direction == PF_OUT) {
switch (pd->af) {
#ifdef INET
case AF_INET:
pf_change_a(&saddr->v4.s_addr,
pd->ip_sum,
(*state)->gwy.addr.v4.s_addr, 0);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
pf_change_a6(saddr,
&pd->hdr.icmp6->icmp6_cksum,
&(*state)->gwy.addr, 0);
m_copyback(m, off,
sizeof(struct icmp6_hdr),
pd->hdr.icmp6);
break;
#endif /* INET6 */
}
} else {
switch (pd->af) {
#ifdef INET
case AF_INET:
pf_change_a(&daddr->v4.s_addr,
pd->ip_sum,
(*state)->lan.addr.v4.s_addr, 0);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
pf_change_a6(daddr,
&pd->hdr.icmp6->icmp6_cksum,
&(*state)->lan.addr, 0);
m_copyback(m, off,
sizeof(struct icmp6_hdr),
pd->hdr.icmp6);
break;
#endif /* INET6 */
}
}
}
return (PF_PASS);
} 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;
#ifdef INET
struct ip h2;
#endif /* INET */
#ifdef INET6
struct ip6_hdr h2_6;
int terminal = 0;
#endif /* INET6 */
int ipoff2 = 0;
int off2 = 0;
memset(&pd2, 0, sizeof pd2); /* XXX gcc */
pd2.af = pd->af;
switch (pd->af) {
#ifdef INET
case AF_INET:
/* offset of h2 in mbuf chain */
ipoff2 = off + ICMP_MINLEN;
if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
NULL, reason, pd2.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: ICMP error message too short "
"(ip)\n"));
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 */
off2 = ipoff2 + (h2.ip_hl << 2);
pd2.proto = h2.ip_p;
pd2.src = (struct pf_addr *)&h2.ip_src;
pd2.dst = (struct pf_addr *)&h2.ip_dst;
pd2.ip_sum = &h2.ip_sum;
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
ipoff2 = off + sizeof(struct icmp6_hdr);
if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
NULL, reason, pd2.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: ICMP error message too short "
"(ip6)\n"));
return (PF_DROP);
}
pd2.proto = h2_6.ip6_nxt;
pd2.src = (struct pf_addr *)&h2_6.ip6_src;
pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
pd2.ip_sum = NULL;
off2 = ipoff2 + sizeof(h2_6);
do {
switch (pd2.proto) {
case IPPROTO_FRAGMENT:
/*
* ICMPv6 error messages for
* non-first fragments
*/
REASON_SET(reason, PFRES_FRAG);
return (PF_DROP);
case IPPROTO_AH:
case IPPROTO_HOPOPTS:
case IPPROTO_ROUTING:
case IPPROTO_DSTOPTS: {
/* get next header and header length */
struct ip6_ext opt6;
if (!pf_pull_hdr(m, off2, &opt6,
sizeof(opt6), NULL, reason,
pd2.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: ICMPv6 short opt\n"));
return (PF_DROP);
}
if (pd2.proto == IPPROTO_AH)
off2 += (opt6.ip6e_len + 2) * 4;
else
off2 += (opt6.ip6e_len + 1) * 8;
pd2.proto = opt6.ip6e_nxt;
/* goto the next header */
break;
}
default:
terminal++;
break;
}
} while (!terminal);
break;
#endif /* INET6 */
}
switch (pd2.proto) {
case IPPROTO_TCP: {
struct tcphdr th;
u_int32_t seq;
struct pf_state key;
struct pf_state_peer *src, *dst;
u_int8_t dws;
int copyback = 0;
/*
* 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(m, off2, &th, 8, NULL, reason,
pd2.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: ICMP error message too short "
"(tcp)\n"));
return (PF_DROP);
}
key.af = pd2.af;
key.proto = IPPROTO_TCP;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd2.dst, key.af);
PF_ACPY(&key.gwy.addr, pd2.src, key.af);
key.ext.port = th.th_dport;
key.gwy.port = th.th_sport;
} else {
PF_ACPY(&key.lan.addr, pd2.dst, key.af);
PF_ACPY(&key.ext.addr, pd2.src, key.af);
key.lan.port = th.th_dport;
key.ext.port = th.th_sport;
}
STATE_LOOKUP();
if (direction == (*state)->direction) {
src = &(*state)->dst;
dst = &(*state)->src;
} else {
src = &(*state)->src;
dst = &(*state)->dst;
}
if (src->wscale && dst->wscale &&
!(th.th_flags & TH_SYN))
dws = dst->wscale & PF_WSCALE_MASK;
else
dws = 0;
/* Demodulate sequence number */
seq = ntohl(th.th_seq) - src->seqdiff;
if (src->seqdiff) {
pf_change_a(&th.th_seq, icmpsum,
htonl(seq), 0);
copyback = 1;
}
if (!SEQ_GEQ(src->seqhi, seq) ||
!SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) {
if (pf_status.debug >= PF_DEBUG_MISC) {
printf("pf: BAD ICMP %d:%d ",
icmptype, pd->hdr.icmp->icmp_code);
pf_print_host(pd->src, 0, pd->af);
printf(" -> ");
pf_print_host(pd->dst, 0, pd->af);
printf(" state: ");
pf_print_state(*state);
printf(" seq=%u\n", seq);
}
REASON_SET(reason, PFRES_BADSTATE);
return (PF_DROP);
}
if (STATE_TRANSLATE(*state)) {
if (direction == PF_IN) {
pf_change_icmp(pd2.src, &th.th_sport,
daddr, &(*state)->lan.addr,
(*state)->lan.port, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, pd2.af);
} else {
pf_change_icmp(pd2.dst, &th.th_dport,
saddr, &(*state)->gwy.addr,
(*state)->gwy.port, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, pd2.af);
}
copyback = 1;
}
if (copyback) {
switch (pd2.af) {
#ifdef INET
case AF_INET:
m_copyback(m, off, ICMP_MINLEN,
pd->hdr.icmp);
m_copyback(m, ipoff2, sizeof(h2),
&h2);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
m_copyback(m, off,
sizeof(struct icmp6_hdr),
pd->hdr.icmp6);
m_copyback(m, ipoff2, sizeof(h2_6),
&h2_6);
break;
#endif /* INET6 */
}
m_copyback(m, off2, 8, &th);
}
return (PF_PASS);
break;
}
case IPPROTO_UDP: {
struct udphdr uh;
struct pf_state key;
if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
NULL, reason, pd2.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: ICMP error message too short "
"(udp)\n"));
return (PF_DROP);
}
key.af = pd2.af;
key.proto = IPPROTO_UDP;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd2.dst, key.af);
PF_ACPY(&key.gwy.addr, pd2.src, key.af);
key.ext.port = uh.uh_dport;
key.gwy.port = uh.uh_sport;
} else {
PF_ACPY(&key.lan.addr, pd2.dst, key.af);
PF_ACPY(&key.ext.addr, pd2.src, key.af);
key.lan.port = uh.uh_dport;
key.ext.port = uh.uh_sport;
}
STATE_LOOKUP();
if (STATE_TRANSLATE(*state)) {
if (direction == PF_IN) {
pf_change_icmp(pd2.src, &uh.uh_sport,
daddr, &(*state)->lan.addr,
(*state)->lan.port, &uh.uh_sum,
pd2.ip_sum, icmpsum,
pd->ip_sum, 1, pd2.af);
} else {
pf_change_icmp(pd2.dst, &uh.uh_dport,
saddr, &(*state)->gwy.addr,
(*state)->gwy.port, &uh.uh_sum,
pd2.ip_sum, icmpsum,
pd->ip_sum, 1, pd2.af);
}
switch (pd2.af) {
#ifdef INET
case AF_INET:
m_copyback(m, off, ICMP_MINLEN,
pd->hdr.icmp);
m_copyback(m, ipoff2, sizeof(h2), &h2);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
m_copyback(m, off,
sizeof(struct icmp6_hdr),
pd->hdr.icmp6);
m_copyback(m, ipoff2, sizeof(h2_6),
&h2_6);
break;
#endif /* INET6 */
}
m_copyback(m, off2, sizeof(uh), &uh);
}
return (PF_PASS);
break;
}
#ifdef INET
case IPPROTO_ICMP: {
struct icmp iih;
struct pf_state key;
if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
NULL, reason, pd2.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: ICMP error message too short i"
"(icmp)\n"));
return (PF_DROP);
}
key.af = pd2.af;
key.proto = IPPROTO_ICMP;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd2.dst, key.af);
PF_ACPY(&key.gwy.addr, pd2.src, key.af);
key.ext.port = iih.icmp_id;
key.gwy.port = iih.icmp_id;
} else {
PF_ACPY(&key.lan.addr, pd2.dst, key.af);
PF_ACPY(&key.ext.addr, pd2.src, key.af);
key.lan.port = iih.icmp_id;
key.ext.port = iih.icmp_id;
}
STATE_LOOKUP();
if (STATE_TRANSLATE(*state)) {
if (direction == PF_IN) {
pf_change_icmp(pd2.src, &iih.icmp_id,
daddr, &(*state)->lan.addr,
(*state)->lan.port, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, AF_INET);
} else {
pf_change_icmp(pd2.dst, &iih.icmp_id,
saddr, &(*state)->gwy.addr,
(*state)->gwy.port, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, AF_INET);
}
m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp);
m_copyback(m, ipoff2, sizeof(h2), &h2);
m_copyback(m, off2, ICMP_MINLEN, &iih);
}
return (PF_PASS);
break;
}
#endif /* INET */
#ifdef INET6
case IPPROTO_ICMPV6: {
struct icmp6_hdr iih;
struct pf_state key;
if (!pf_pull_hdr(m, off2, &iih,
sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: ICMP error message too short "
"(icmp6)\n"));
return (PF_DROP);
}
key.af = pd2.af;
key.proto = IPPROTO_ICMPV6;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd2.dst, key.af);
PF_ACPY(&key.gwy.addr, pd2.src, key.af);
key.ext.port = iih.icmp6_id;
key.gwy.port = iih.icmp6_id;
} else {
PF_ACPY(&key.lan.addr, pd2.dst, key.af);
PF_ACPY(&key.ext.addr, pd2.src, key.af);
key.lan.port = iih.icmp6_id;
key.ext.port = iih.icmp6_id;
}
STATE_LOOKUP();
if (STATE_TRANSLATE(*state)) {
if (direction == PF_IN) {
pf_change_icmp(pd2.src, &iih.icmp6_id,
daddr, &(*state)->lan.addr,
(*state)->lan.port, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, AF_INET6);
} else {
pf_change_icmp(pd2.dst, &iih.icmp6_id,
saddr, &(*state)->gwy.addr,
(*state)->gwy.port, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, AF_INET6);
}
m_copyback(m, off, sizeof(struct icmp6_hdr),
pd->hdr.icmp6);
m_copyback(m, ipoff2, sizeof(h2_6), &h2_6);
m_copyback(m, off2, sizeof(struct icmp6_hdr),
&iih);
}
return (PF_PASS);
break;
}
#endif /* INET6 */
default: {
struct pf_state key;
key.af = pd2.af;
key.proto = pd2.proto;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd2.dst, key.af);
PF_ACPY(&key.gwy.addr, pd2.src, key.af);
key.ext.port = 0;
key.gwy.port = 0;
} else {
PF_ACPY(&key.lan.addr, pd2.dst, key.af);
PF_ACPY(&key.ext.addr, pd2.src, key.af);
key.lan.port = 0;
key.ext.port = 0;
}
STATE_LOOKUP();
if (STATE_TRANSLATE(*state)) {
if (direction == PF_IN) {
pf_change_icmp(pd2.src, NULL,
daddr, &(*state)->lan.addr,
0, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, pd2.af);
} else {
pf_change_icmp(pd2.dst, NULL,
saddr, &(*state)->gwy.addr,
0, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, pd2.af);
}
switch (pd2.af) {
#ifdef INET
case AF_INET:
m_copyback(m, off, ICMP_MINLEN,
pd->hdr.icmp);
m_copyback(m, ipoff2, sizeof(h2), &h2);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
m_copyback(m, off,
sizeof(struct icmp6_hdr),
pd->hdr.icmp6);
m_copyback(m, ipoff2, sizeof(h2_6),
&h2_6);
break;
#endif /* INET6 */
}
}
return (PF_PASS);
break;
}
}
}
}
int
pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
struct pf_pdesc *pd)
{
struct pf_state_peer *src, *dst;
struct pf_state key;
key.af = pd->af;
key.proto = pd->proto;
if (direction == PF_IN) {
PF_ACPY(&key.ext.addr, pd->src, key.af);
PF_ACPY(&key.gwy.addr, pd->dst, key.af);
key.ext.port = 0;
key.gwy.port = 0;
} else {
PF_ACPY(&key.lan.addr, pd->src, key.af);
PF_ACPY(&key.ext.addr, pd->dst, key.af);
key.lan.port = 0;
key.ext.port = 0;
}
STATE_LOOKUP();
if (direction == (*state)->direction) {
src = &(*state)->src;
dst = &(*state)->dst;
} else {
src = &(*state)->dst;
dst = &(*state)->src;
}
/* update states */
if (src->state < PFOTHERS_SINGLE)
src->state = PFOTHERS_SINGLE;
if (dst->state == PFOTHERS_SINGLE)
dst->state = PFOTHERS_MULTIPLE;
/* update expire time */
(*state)->expire = time_second;
if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
(*state)->timeout = PFTM_OTHER_MULTIPLE;
else
(*state)->timeout = PFTM_OTHER_SINGLE;
/* translate source/destination address, if necessary */
if (STATE_TRANSLATE(*state)) {
if (direction == PF_OUT)
switch (pd->af) {
#ifdef INET
case AF_INET:
pf_change_a(&pd->src->v4.s_addr,
pd->ip_sum, (*state)->gwy.addr.v4.s_addr,
0);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af);
break;
#endif /* INET6 */
}
else
switch (pd->af) {
#ifdef INET
case AF_INET:
pf_change_a(&pd->dst->v4.s_addr,
pd->ip_sum, (*state)->lan.addr.v4.s_addr,
0);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af);
break;
#endif /* INET6 */
}
}
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 *actionp, u_short *reasonp, sa_family_t af)
{
switch (af) {
#ifdef INET
case AF_INET: {
struct ip *h = mtod(m, struct ip *);
u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3;
if (fragoff) {
if (fragoff >= len)
ACTION_SET(actionp, PF_PASS);
else {
ACTION_SET(actionp, PF_DROP);
REASON_SET(reasonp, PFRES_FRAG);
}
return (NULL);
}
if (m->m_pkthdr.len < off + len ||
ntohs(h->ip_len) < off + len) {
ACTION_SET(actionp, PF_DROP);
REASON_SET(reasonp, PFRES_SHORT);
return (NULL);
}
break;
}
#endif /* INET */
#ifdef INET6
case AF_INET6: {
struct ip6_hdr *h = mtod(m, struct ip6_hdr *);
if (m->m_pkthdr.len < off + len ||
(ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
(unsigned)(off + len)) {
ACTION_SET(actionp, PF_DROP);
REASON_SET(reasonp, PFRES_SHORT);
return (NULL);
}
break;
}
#endif /* INET6 */
}
m_copydata(m, off, len, p);
return (p);
}
int
pf_routable(struct pf_addr *addr, sa_family_t af)
{
struct sockaddr_in *dst;
#ifdef INET6
struct sockaddr_in6 *dst6;
struct route_in6 ro;
#else
struct route ro;
#endif
bzero(&ro, sizeof(ro));
switch (af) {
case AF_INET:
dst = satosin(&ro.ro_dst);
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 *)&ro.ro_dst;
dst6->sin6_family = AF_INET6;
dst6->sin6_len = sizeof(*dst6);
dst6->sin6_addr = addr->v6;
break;
#endif /* INET6 */
default:
return (0);
}
#ifdef __OpenBSD__
rtalloc_noclone((struct route *)&ro, NO_CLONING);
if (ro.ro_rt != NULL) {
RTFREE(ro.ro_rt);
return (1);
}
#else
rtcache_init((struct route *)&ro);
if (ro.ro_rt != NULL) {
rtcache_free((struct route *)&ro);
return (1);
}
#endif
return (0);
}
int
pf_rtlabel_match(struct pf_addr *addr, sa_family_t af,
struct pf_addr_wrap *aw)
{
#if 0
struct sockaddr_in *dst;
#ifdef INET6
struct sockaddr_in6 *dst6;
struct route_in6 ro;
#else
struct route ro;
#endif
int ret = 0;
bzero(&ro, sizeof(ro));
switch (af) {
case AF_INET:
dst = satosin(&ro.ro_dst);
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 *)&ro.ro_dst;
dst6->sin6_family = AF_INET6;
dst6->sin6_len = sizeof(*dst6);
dst6->sin6_addr = addr->v6;
break;
#endif /* INET6 */
default:
return (0);
}
#ifdef __OpenBSD__
rtalloc_noclone((struct route *)&ro, NO_CLONING);
#else
rtcache_init((struct route *)&ro);
#endif
#ifdef __OpenBSD__
if (ro.ro_rt != NULL) {
if (ro.ro_rt->rt_labelid == aw->v.rtlabel)
ret = 1;
RTFREE(ro.ro_rt);
}
#else
rtcache_free((struct route *)&ro);
#endif
return (ret);
#else
return 0;
#endif
}
#ifdef INET
void
pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
struct pf_state *s)
{
struct mbuf *m0, *m1;
struct m_tag *mtag;
struct route iproute;
struct route *ro = NULL;
struct sockaddr_in *dst;
struct ip *ip;
struct ifnet *ifp = NULL;
struct pf_addr naddr;
struct pf_src_node *sn = NULL;
int error = 0;
if (m == NULL || *m == NULL || r == NULL ||
(dir != PF_IN && dir != PF_OUT) || oifp == NULL)
panic("pf_route: invalid parameters");
if ((mtag = m_tag_find(*m, PACKET_TAG_PF_ROUTED, NULL)) == NULL) {
if ((mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 1, M_NOWAIT)) ==
NULL) {
m0 = *m;
*m = NULL;
goto bad;
}
*(char *)(mtag + 1) = 1;
m_tag_prepend(*m, mtag);
} else {
if (*(char *)(mtag + 1) > 3) {
m0 = *m;
*m = NULL;
goto bad;
}
(*(char *)(mtag + 1))++;
}
if (r->rt == PF_DUPTO) {
if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL)
return;
} else {
if ((r->rt == PF_REPLYTO) == (r->direction == dir))
return;
m0 = *m;
}
if (m0->m_len < sizeof(struct ip)) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_route: m0->m_len < sizeof(struct ip)\n"));
goto bad;
}
ip = mtod(m0, struct ip *);
ro = &iproute;
bzero((void *)ro, sizeof(*ro));
dst = satosin(&ro->ro_dst);
dst->sin_family = AF_INET;
dst->sin_len = sizeof(*dst);
dst->sin_addr = ip->ip_dst;
if (r->rt == PF_FASTROUTE) {
rtcache_init(ro);
if (ro->ro_rt == NULL) {
ipstat.ips_noroute++;
goto bad;
}
ifp = ro->ro_rt->rt_ifp;
ro->ro_rt->rt_use++;
if (ro->ro_rt->rt_flags & RTF_GATEWAY)
dst = satosin(ro->ro_rt->rt_gateway);
} else {
if (TAILQ_EMPTY(&r->rpool.list)) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_route: TAILQ_EMPTY(&r->rpool.list)\n"));
goto bad;
}
if (s == NULL) {
pf_map_addr(AF_INET, r,
(const struct pf_addr *)&ip->ip_src,
&naddr, NULL, &sn);
if (!PF_AZERO(&naddr, AF_INET))
dst->sin_addr.s_addr = naddr.v4.s_addr;
ifp = r->rpool.cur->kif ?
r->rpool.cur->kif->pfik_ifp : NULL;
} else {
if (!PF_AZERO(&s->rt_addr, AF_INET))
dst->sin_addr.s_addr =
s->rt_addr.v4.s_addr;
ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
}
}
if (ifp == NULL)
goto bad;
if (oifp != ifp) {
if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS)
goto bad;
else if (m0 == NULL)
goto done;
if (m0->m_len < sizeof(struct ip)) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_route: m0->m_len < sizeof(struct ip)\n"));
goto bad;
}
ip = mtod(m0, struct ip *);
}
/* Copied from ip_output. */
#ifdef IPSEC
/*
* If deferred crypto processing is needed, check that the
* interface supports it.
*/
if ((mtag = m_tag_find(m0, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL))
!= NULL && (ifp->if_capabilities & IFCAP_IPSEC) == 0) {
/* Notify IPsec to do its own crypto. */
ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1));
goto bad;
}
#endif /* IPSEC */
/* Catch routing changes wrt. hardware checksumming for TCP or UDP. */
#ifdef __OpenBSD__
if (m0->m_pkthdr.csum & M_TCPV4_CSUM_OUT) {
if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) ||
ifp->if_bridge != NULL) {
in_delayed_cksum(m0);
m0->m_pkthdr.csum &= ~M_TCPV4_CSUM_OUT; /* Clear */
}
} else if (m0->m_pkthdr.csum & M_UDPV4_CSUM_OUT) {
if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) ||
ifp->if_bridge != NULL) {
in_delayed_cksum(m0);
m0->m_pkthdr.csum &= ~M_UDPV4_CSUM_OUT; /* Clear */
}
}
#else
if (m0->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) {
in_delayed_cksum(m0);
m0->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4);
}
#endif
if (ntohs(ip->ip_len) <= ifp->if_mtu) {
#ifdef __OpenBSD__
if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) &&
ifp->if_bridge == NULL) {
m0->m_pkthdr.csum |= M_IPV4_CSUM_OUT;
ipstat.ips_outhwcsum++;
} else {
ip->ip_sum = 0;
ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
}
#else
ip->ip_sum = 0;
ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
m0->m_pkthdr.csum_flags &= ~M_CSUM_IPv4;
#endif
#ifdef __OpenBSD__
/* Update relevant hardware checksum stats for TCP/UDP */
if (m0->m_pkthdr.csum & M_TCPV4_CSUM_OUT)
tcpstat.tcps_outhwcsum++;
else if (m0->m_pkthdr.csum & M_UDPV4_CSUM_OUT)
udpstat.udps_outhwcsum++;
#endif
error = (*ifp->if_output)(ifp, m0, sintosa(dst), 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.ips_cantfrag++;
if (r->rt != PF_DUPTO) {
icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
ifp->if_mtu);
goto done;
} else
goto bad;
}
m1 = m0;
error = ip_fragment(m0, ifp, ifp->if_mtu);
if (error) {
m0 = NULL;
goto bad;
}
for (m0 = m1; m0; m0 = m1) {
m1 = m0->m_nextpkt;
m0->m_nextpkt = 0;
if (error == 0)
error = (*ifp->if_output)(ifp, m0, sintosa(dst),
NULL);
else
m_freem(m0);
}
if (error == 0)
ipstat.ips_fragmented++;
done:
if (r->rt != PF_DUPTO)
*m = NULL;
if (ro == &iproute)
rtcache_free(ro);
return;
bad:
m_freem(m0);
goto done;
}
#endif /* INET */
#ifdef INET6
void
pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
struct pf_state *s)
{
struct mbuf *m0;
struct m_tag *mtag;
struct sockaddr_in6 dst;
struct ip6_hdr *ip6;
struct ifnet *ifp = NULL;
struct pf_addr naddr;
struct pf_src_node *sn = NULL;
int error = 0;
if (m == NULL || *m == NULL || r == NULL ||
(dir != PF_IN && dir != PF_OUT) || oifp == NULL)
panic("pf_route6: invalid parameters");
if ((mtag = m_tag_find(*m, PACKET_TAG_PF_ROUTED, NULL)) == NULL) {
if ((mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 1, M_NOWAIT)) ==
NULL) {
m0 = *m;
*m = NULL;
goto bad;
}
*(char *)(mtag + 1) = 1;
m_tag_prepend(*m, mtag);
} else {
if (*(char *)(mtag + 1) > 3) {
m0 = *m;
*m = NULL;
goto bad;
}
(*(char *)(mtag + 1))++;
}
if (r->rt == PF_DUPTO) {
if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL)
return;
} else {
if ((r->rt == PF_REPLYTO) == (r->direction == dir))
return;
m0 = *m;
}
if (m0->m_len < sizeof(struct ip6_hdr)) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
goto bad;
}
ip6 = mtod(m0, struct ip6_hdr *);
dst.sin6_family = AF_INET6;
dst.sin6_len = sizeof(dst);
dst.sin6_addr = ip6->ip6_dst;
/* Cheat. */
if (r->rt == PF_FASTROUTE) {
mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT);
if (mtag == NULL)
goto bad;
m_tag_prepend(m0, mtag);
#ifdef __OpenBSD__
ip6_output(m0, NULL, NULL, 0, NULL, NULL);
#else
ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
#endif
return;
}
if (TAILQ_EMPTY(&r->rpool.list)) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n"));
goto bad;
}
if (s == NULL) {
pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
&naddr, NULL, &sn);
if (!PF_AZERO(&naddr, AF_INET6))
PF_ACPY((struct pf_addr *)&dst.sin6_addr,
&naddr, AF_INET6);
ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
} else {
if (!PF_AZERO(&s->rt_addr, AF_INET6))
PF_ACPY((struct pf_addr *)&dst.sin6_addr,
&s->rt_addr, AF_INET6);
ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
}
if (ifp == NULL)
goto bad;
if (oifp != ifp) {
if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS)
goto bad;
else if (m0 == NULL)
goto done;
if (m0->m_len < sizeof(struct ip6_hdr)) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
goto bad;
}
ip6 = mtod(m0, struct ip6_hdr *);
}
/*
* If the packet is too large for the outgoing interface,
* send back an icmp6 error.
*/
if (IN6_IS_ADDR_LINKLOCAL(&dst.sin6_addr))
dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
error = nd6_output(ifp, ifp, m0, &dst, NULL);
} else {
in6_ifstat_inc(ifp, ifs6_in_toobig);
if (r->rt != PF_DUPTO)
icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
else
goto bad;
}
done:
if (r->rt != PF_DUPTO)
*m = NULL;
return;
bad:
m_freem(m0);
goto done;
}
#endif /* INET6 */
/*
* check protocol (tcp/udp/icmp/icmp6) 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.
*/
int
pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
sa_family_t af)
{
#ifdef __OpenBSD__
u_int16_t flag_ok, flag_bad;
#endif
u_int16_t sum;
#ifdef __OpenBSD__
switch (p) {
case IPPROTO_TCP:
flag_ok = M_TCP_CSUM_IN_OK;
flag_bad = M_TCP_CSUM_IN_BAD;
break;
case IPPROTO_UDP:
flag_ok = M_UDP_CSUM_IN_OK;
flag_bad = M_UDP_CSUM_IN_BAD;
break;
case IPPROTO_ICMP:
#ifdef INET6
case IPPROTO_ICMPV6:
#endif /* INET6 */
flag_ok = flag_bad = 0;
break;
default:
return (1);
}
if (m->m_pkthdr.csum & flag_ok)
return (0);
if (m->m_pkthdr.csum & flag_bad)
return (1);
#endif
if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
return (1);
if (m->m_pkthdr.len < off + len)
return (1);
#ifdef __NetBSD__
switch (p) {
case IPPROTO_TCP: {
struct tcphdr th; /* XXX */
int thlen;
m_copydata(m, off, sizeof(th), &th); /* XXX */
thlen = th.th_off << 2;
return tcp_input_checksum(af, m, &th, off,
thlen, len - thlen) != 0;
}
case IPPROTO_UDP: {
struct udphdr uh; /* XXX */
m_copydata(m, off, sizeof(uh), &uh); /* XXX */
return udp_input_checksum(af, m, &uh, off, len) != 0;
}
break;
}
#endif /* __NetBSD__ */
switch (af) {
#ifdef INET
case AF_INET:
if (p == IPPROTO_ICMP) {
if (m->m_len < off)
return (1);
m->m_data += off;
m->m_len -= off;
sum = in_cksum(m, len);
m->m_data -= off;
m->m_len += off;
} else {
if (m->m_len < sizeof(struct ip))
return (1);
sum = in4_cksum(m, p, off, len);
}
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
if (m->m_len < sizeof(struct ip6_hdr))
return (1);
sum = in6_cksum(m, p, off, len);
break;
#endif /* INET6 */
default:
return (1);
}
if (sum) {
#ifdef __OpenBSD__
m->m_pkthdr.csum |= flag_bad;
#endif
switch (p) {
case IPPROTO_TCP:
tcpstat.tcps_rcvbadsum++;
break;
case IPPROTO_UDP:
udpstat.udps_badsum++;
break;
case IPPROTO_ICMP:
icmpstat.icps_checksum++;
break;
#ifdef INET6
case IPPROTO_ICMPV6:
icmp6stat.icp6s_checksum++;
break;
#endif /* INET6 */
}
return (1);
}
#ifdef __OpenBSD__
m->m_pkthdr.csum |= flag_ok;
#endif
return (0);
}
static int
pf_add_mbuf_tag(struct mbuf *m, u_int tag)
{
struct m_tag *mtag;
if (m_tag_find(m, tag, NULL) != NULL)
return (0);
mtag = m_tag_get(tag, 0, M_NOWAIT);
if (mtag == NULL)
return (1);
m_tag_prepend(m, mtag);
return (0);
}
#ifdef INET
int
pf_test(int dir, struct ifnet *ifp, struct mbuf **m0,
struct ether_header *eh)
{
struct pfi_kif *kif;
u_short action, reason = 0, log = 0;
struct mbuf *m = *m0;
struct ip *h = NULL;
struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr;
struct pf_state *s = NULL;
struct pf_ruleset *ruleset = NULL;
struct pf_pdesc pd;
int off, dirndx, pqid = 0;
if (!pf_status.running ||
(m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL))
return (PF_PASS);
#if NCARP > 0
if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
ifp = ifp->if_carpdev;
#endif
kif = pfi_index2kif[ifp->if_index];
if (kif == NULL) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
return (PF_DROP);
}
if (kif->pfik_flags & PFI_IFLAG_SKIP)
return (PF_PASS);
#ifdef DIAGNOSTIC
if ((m->m_flags & M_PKTHDR) == 0)
panic("non-M_PKTHDR is passed to pf_test");
#endif /* DIAGNOSTIC */
memset(&pd, 0, sizeof(pd));
if (m->m_pkthdr.len < (int)sizeof(*h)) {
action = PF_DROP;
REASON_SET(&reason, PFRES_SHORT);
log = 1;
goto done;
}
/* We do IP header normalization and packet reassembly here */
if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
action = PF_DROP;
goto done;
}
m = *m0;
h = mtod(m, struct ip *);
off = h->ip_hl << 2;
if (off < (int)sizeof(*h)) {
action = PF_DROP;
REASON_SET(&reason, PFRES_SHORT);
log = 1;
goto done;
}
pd.src = (struct pf_addr *)&h->ip_src;
pd.dst = (struct pf_addr *)&h->ip_dst;
PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET);
pd.ip_sum = &h->ip_sum;
pd.proto = h->ip_p;
pd.af = AF_INET;
pd.tos = h->ip_tos;
pd.tot_len = ntohs(h->ip_len);
pd.eh = eh;
/* handle fragments that didn't get reassembled by normalization */
if (h->ip_off & htons(IP_MF | IP_OFFMASK)) {
action = pf_test_fragment(&r, dir, kif, m, h,
&pd, &a, &ruleset);
goto done;
}
switch (h->ip_p) {
case IPPROTO_TCP: {
struct tcphdr th;
pd.hdr.tcp = &th;
if (!pf_pull_hdr(m, off, &th, sizeof(th),
&action, &reason, AF_INET)) {
log = action != PF_PASS;
goto done;
}
if (dir == PF_IN && pf_check_proto_cksum(m, off,
ntohs(h->ip_len) - off, IPPROTO_TCP, AF_INET)) {
action = PF_DROP;
goto done;
}
pd.p_len = pd.tot_len - off - (th.th_off << 2);
if ((th.th_flags & TH_ACK) && pd.p_len == 0)
pqid = 1;
action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
if (action == PF_DROP)
goto done;
action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
&reason);
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif /* NPFSYNC */
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_tcp(&r, &s, dir, kif,
m, off, h, &pd, &a, &ruleset, &ipintrq);
break;
}
case IPPROTO_UDP: {
struct udphdr uh;
pd.hdr.udp = &uh;
if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
&action, &reason, AF_INET)) {
log = action != PF_PASS;
goto done;
}
if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
off, ntohs(h->ip_len) - off, IPPROTO_UDP, AF_INET)) {
action = PF_DROP;
goto done;
}
if (uh.uh_dport == 0 ||
ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
action = PF_DROP;
goto done;
}
action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif /* NPFSYNC */
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_udp(&r, &s, dir, kif,
m, off, h, &pd, &a, &ruleset, &ipintrq);
break;
}
case IPPROTO_ICMP: {
struct icmp ih;
pd.hdr.icmp = &ih;
if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
&action, &reason, AF_INET)) {
log = action != PF_PASS;
goto done;
}
if (dir == PF_IN && pf_check_proto_cksum(m, off,
ntohs(h->ip_len) - off, IPPROTO_ICMP, AF_INET)) {
action = PF_DROP;
goto done;
}
action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
&reason);
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif /* NPFSYNC */
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_icmp(&r, &s, dir, kif,
m, off, h, &pd, &a, &ruleset, &ipintrq);
break;
}
default:
action = pf_test_state_other(&s, dir, kif, &pd);
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif /* NPFSYNC */
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_other(&r, &s, dir, kif, m, off, h,
&pd, &a, &ruleset, &ipintrq);
break;
}
done:
if (action == PF_PASS && h->ip_hl > 5 &&
!((s && s->allow_opts) || r->allow_opts)) {
action = PF_DROP;
REASON_SET(&reason, PFRES_IPOPTIONS);
log = 1;
DPFPRINTF(PF_DEBUG_MISC,
("pf: dropping packet with ip options\n"));
}
if (s && s->tag)
pf_tag_packet(m, pf_get_tag(m), s->tag);
#ifdef ALTQ
if (action == PF_PASS && r->qid) {
struct m_tag *mtag;
struct altq_tag *atag;
mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT);
if (mtag != NULL) {
atag = (struct altq_tag *)(mtag + 1);
if (pqid || pd.tos == IPTOS_LOWDELAY)
atag->qid = r->pqid;
else
atag->qid = r->qid;
/* add hints for ecn */
atag->af = AF_INET;
atag->hdr = h;
m_tag_prepend(m, mtag);
}
}
#endif /* ALTQ */
/*
* connections redirected to loopback should not match sockets
* bound specifically to loopback due to security implications,
* see tcp_input() and in_pcblookup_listen().
*/
if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
(s->nat_rule.ptr->action == PF_RDR ||
s->nat_rule.ptr->action == PF_BINAT) &&
(ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET &&
pf_add_mbuf_tag(m, PACKET_TAG_PF_TRANSLATE_LOCALHOST)) {
action = PF_DROP;
REASON_SET(&reason, PFRES_MEMORY);
}
if (log)
PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, r, a, ruleset);
kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
if (action == PF_PASS || r->action == PF_DROP) {
r->packets++;
r->bytes += pd.tot_len;
if (a != NULL) {
a->packets++;
a->bytes += pd.tot_len;
}
if (s != NULL) {
dirndx = (dir == s->direction) ? 0 : 1;
s->packets[dirndx]++;
s->bytes[dirndx] += pd.tot_len;
if (s->nat_rule.ptr != NULL) {
s->nat_rule.ptr->packets++;
s->nat_rule.ptr->bytes += pd.tot_len;
}
if (s->src_node != NULL) {
s->src_node->packets++;
s->src_node->bytes += pd.tot_len;
}
if (s->nat_src_node != NULL) {
s->nat_src_node->packets++;
s->nat_src_node->bytes += pd.tot_len;
}
}
tr = r;
nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
if (nr != NULL) {
struct pf_addr *x;
/*
* XXX: we need to make sure that the addresses
* passed to pfr_update_stats() are the same than
* the addresses used during matching (pfr_match)
*/
if (r == &pf_default_rule) {
tr = nr;
x = (s == NULL || s->direction == dir) ?
&pd.baddr : &pd.naddr;
} else
x = (s == NULL || s->direction == dir) ?
&pd.naddr : &pd.baddr;
if (x == &pd.baddr || s == NULL) {
/* we need to change the address */
if (dir == PF_OUT)
pd.src = x;
else
pd.dst = x;
}
}
if (tr->src.addr.type == PF_ADDR_TABLE)
pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
s->direction == dir) ? pd.src : pd.dst, pd.af,
pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
tr->src.neg);
if (tr->dst.addr.type == PF_ADDR_TABLE)
pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
s->direction == dir) ? pd.dst : pd.src, pd.af,
pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
tr->dst.neg);
}
if (action == PF_SYNPROXY_DROP) {
m_freem(*m0);
*m0 = NULL;
action = PF_PASS;
} else if (r->rt)
/* pf_route can free the mbuf causing *m0 to become NULL */
pf_route(m0, r, dir, ifp, s);
return (action);
}
#endif /* INET */
#ifdef INET6
int
pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0,
struct ether_header *eh)
{
struct pfi_kif *kif;
u_short action, reason = 0, log = 0;
struct mbuf *m = *m0;
struct ip6_hdr *h = NULL;
struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr;
struct pf_state *s = NULL;
struct pf_ruleset *ruleset = NULL;
struct pf_pdesc pd;
int off, terminal = 0, dirndx;
if (!pf_status.running ||
(m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL))
return (PF_PASS);
#if NCARP > 0
if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
ifp = ifp->if_carpdev;
#endif
kif = pfi_index2kif[ifp->if_index];
if (kif == NULL) {
DPFPRINTF(PF_DEBUG_URGENT,
("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
return (PF_DROP);
}
if (kif->pfik_flags & PFI_IFLAG_SKIP)
return (PF_PASS);
#ifdef DIAGNOSTIC
if ((m->m_flags & M_PKTHDR) == 0)
panic("non-M_PKTHDR is passed to pf_test6");
#endif /* DIAGNOSTIC */
memset(&pd, 0, sizeof(pd));
if (m->m_pkthdr.len < (int)sizeof(*h)) {
action = PF_DROP;
REASON_SET(&reason, PFRES_SHORT);
log = 1;
goto done;
}
/* We do IP header normalization and packet reassembly here */
if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
action = PF_DROP;
goto done;
}
m = *m0;
h = mtod(m, struct ip6_hdr *);
pd.src = (struct pf_addr *)&h->ip6_src;
pd.dst = (struct pf_addr *)&h->ip6_dst;
PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6);
pd.ip_sum = NULL;
pd.af = AF_INET6;
pd.tos = 0;
pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
pd.eh = eh;
off = ((char *)h - m->m_data) + sizeof(struct ip6_hdr);
pd.proto = h->ip6_nxt;
do {
switch (pd.proto) {
case IPPROTO_FRAGMENT:
action = pf_test_fragment(&r, dir, kif, m, h,
&pd, &a, &ruleset);
if (action == PF_DROP)
REASON_SET(&reason, PFRES_FRAG);
goto done;
case IPPROTO_AH:
case IPPROTO_HOPOPTS:
case IPPROTO_ROUTING:
case IPPROTO_DSTOPTS: {
/* get next header and header length */
struct ip6_ext opt6;
if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
NULL, &reason, pd.af)) {
DPFPRINTF(PF_DEBUG_MISC,
("pf: IPv6 short opt\n"));
action = PF_DROP;
log = 1;
goto done;
}
if (pd.proto == IPPROTO_AH)
off += (opt6.ip6e_len + 2) * 4;
else
off += (opt6.ip6e_len + 1) * 8;
pd.proto = opt6.ip6e_nxt;
/* goto the next header */
break;
}
default:
terminal++;
break;
}
} while (!terminal);
switch (pd.proto) {
case IPPROTO_TCP: {
struct tcphdr th;
pd.hdr.tcp = &th;
if (!pf_pull_hdr(m, off, &th, sizeof(th),
&action, &reason, AF_INET6)) {
log = action != PF_PASS;
goto done;
}
if (dir == PF_IN && pf_check_proto_cksum(m, off,
ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)),
IPPROTO_TCP, AF_INET6)) {
action = PF_DROP;
REASON_SET(&reason, PFRES_PROTCKSUM);
goto done;
}
pd.p_len = pd.tot_len - off - (th.th_off << 2);
action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
if (action == PF_DROP)
goto done;
action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
&reason);
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif /* NPFSYNC */
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_tcp(&r, &s, dir, kif,
m, off, h, &pd, &a, &ruleset, &ip6intrq);
break;
}
case IPPROTO_UDP: {
struct udphdr uh;
pd.hdr.udp = &uh;
if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
&action, &reason, AF_INET6)) {
log = action != PF_PASS;
goto done;
}
if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
off, ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)),
IPPROTO_UDP, AF_INET6)) {
action = PF_DROP;
REASON_SET(&reason, PFRES_PROTCKSUM);
goto done;
}
if (uh.uh_dport == 0 ||
ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
action = PF_DROP;
goto done;
}
action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif /* NPFSYNC */
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_udp(&r, &s, dir, kif,
m, off, h, &pd, &a, &ruleset, &ip6intrq);
break;
}
case IPPROTO_ICMPV6: {
struct icmp6_hdr ih;
pd.hdr.icmp6 = &ih;
if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
&action, &reason, AF_INET6)) {
log = action != PF_PASS;
goto done;
}
if (dir == PF_IN && pf_check_proto_cksum(m, off,
ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)),
IPPROTO_ICMPV6, AF_INET6)) {
action = PF_DROP;
REASON_SET(&reason, PFRES_PROTCKSUM);
goto done;
}
action = pf_test_state_icmp(&s, dir, kif,
m, off, h, &pd, &reason);
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif /* NPFSYNC */
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_icmp(&r, &s, dir, kif,
m, off, h, &pd, &a, &ruleset, &ip6intrq);
break;
}
default:
action = pf_test_state_other(&s, dir, kif, &pd);
if (action == PF_PASS) {
#if NPFSYNC
pfsync_update_state(s);
#endif /* NPFSYNC */
r = s->rule.ptr;
a = s->anchor.ptr;
log = s->log;
} else if (s == NULL)
action = pf_test_other(&r, &s, dir, kif, m, off, h,
&pd, &a, &ruleset, &ip6intrq);
break;
}
done:
/* XXX handle IPv6 options, if not allowed. not implemented. */
if (s && s->tag)
pf_tag_packet(m, pf_get_tag(m), s->tag);
#ifdef ALTQ
if (action == PF_PASS && r->qid) {
struct m_tag *mtag;
struct altq_tag *atag;
mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT);
if (mtag != NULL) {
atag = (struct altq_tag *)(mtag + 1);
if (pd.tos == IPTOS_LOWDELAY)
atag->qid = r->pqid;
else
atag->qid = r->qid;
/* add hints for ecn */
atag->af = AF_INET6;
atag->hdr = h;
m_tag_prepend(m, mtag);
}
}
#endif /* ALTQ */
if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
(s->nat_rule.ptr->action == PF_RDR ||
s->nat_rule.ptr->action == PF_BINAT) &&
IN6_IS_ADDR_LOOPBACK(&pd.dst->v6) &&
pf_add_mbuf_tag(m, PACKET_TAG_PF_TRANSLATE_LOCALHOST)) {
action = PF_DROP;
REASON_SET(&reason, PFRES_MEMORY);
}
if (log)
PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, r, a, ruleset);
kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
if (action == PF_PASS || r->action == PF_DROP) {
r->packets++;
r->bytes += pd.tot_len;
if (a != NULL) {
a->packets++;
a->bytes += pd.tot_len;
}
if (s != NULL) {
dirndx = (dir == s->direction) ? 0 : 1;
s->packets[dirndx]++;
s->bytes[dirndx] += pd.tot_len;
if (s->nat_rule.ptr != NULL) {
s->nat_rule.ptr->packets++;
s->nat_rule.ptr->bytes += pd.tot_len;
}
if (s->src_node != NULL) {
s->src_node->packets++;
s->src_node->bytes += pd.tot_len;
}
if (s->nat_src_node != NULL) {
s->nat_src_node->packets++;
s->nat_src_node->bytes += pd.tot_len;
}
}
tr = r;
nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
if (nr != NULL) {
struct pf_addr *x;
/*
* XXX: we need to make sure that the addresses
* passed to pfr_update_stats() are the same than
* the addresses used during matching (pfr_match)
*/
if (r == &pf_default_rule) {
tr = nr;
x = (s == NULL || s->direction == dir) ?
&pd.baddr : &pd.naddr;
} else {
x = (s == NULL || s->direction == dir) ?
&pd.naddr : &pd.baddr;
}
if (x == &pd.baddr || s == NULL) {
if (dir == PF_OUT)
pd.src = x;
else
pd.dst = x;
}
}
if (tr->src.addr.type == PF_ADDR_TABLE)
pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
s->direction == dir) ? pd.src : pd.dst, pd.af,
pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
tr->src.neg);
if (tr->dst.addr.type == PF_ADDR_TABLE)
pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
s->direction == dir) ? pd.dst : pd.src, pd.af,
pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
tr->dst.neg);
}
if (action == PF_SYNPROXY_DROP) {
m_freem(*m0);
*m0 = NULL;
action = PF_PASS;
} else if (r->rt)
/* pf_route6 can free the mbuf causing *m0 to become NULL */
pf_route6(m0, r, dir, ifp, s);
return (action);
}
#endif /* INET6 */
int
pf_check_congestion(struct ifqueue *ifq)
{
#ifdef __OpenBSD__
if (ifq->ifq_congestion)
return (1);
else
return (0);
#else
return 0;
#endif
}
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