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191c6e1310
freebsd/sys/contrib/pf/net/if_pfsync.c
John Baldwin 0dea849ae9 Various bpf(4) related fixes to catch places up to the new bpf(4) 
semantics.
- Stop testing bpf pointers for NULL.  In some cases use
  bpf_peers_present() and then call the function directly inside the
  conditional block instead of the macro.
- For places where the entire conditional block is the macro, remove the
  test and make the macro unconditional.
- Use BPF_MTAP() in if_pfsync on FreeBSD instead of an expanded version of
  the old semantics.

Reviewed by:	csjp (older version)
2006-12-29 13:59:50 +00:00

1921 lines
45 KiB
C
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/* $FreeBSD$ */
/* $OpenBSD: if_pfsync.c,v 1.46 2005/02/20 15:58:38 mcbride Exp $ */
/*
* Copyright (c) 2002 Michael Shalayeff
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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 AUTHOR ``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 AUTHOR OR HIS RELATIVES 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 MIND, 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.
*/
#ifdef __FreeBSD__
#include "opt_inet.h"
#include "opt_inet6.h"
#endif
#ifndef __FreeBSD__
#include "bpfilter.h"
#include "pfsync.h"
#elif __FreeBSD__ >= 5
#include "opt_bpf.h"
#include "opt_pf.h"
#ifdef DEV_BPF
#define NBPFILTER DEV_BPF
#else
#define NBPFILTER 0
#endif
#ifdef DEV_PFSYNC
#define NPFSYNC DEV_PFSYNC
#else
#define NPFSYNC 0
#endif
#endif
#include <sys/param.h>
#ifdef __FreeBSD__
#include <sys/priv.h>
#endif
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/kernel.h>
#ifdef __FreeBSD__
#include <sys/endian.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/sockio.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/sysctl.h>
#else
#include <sys/ioctl.h>
#include <sys/timeout.h>
#endif
#include <net/if.h>
#if defined(__FreeBSD__)
#include <net/if_clone.h>
#endif
#include <net/if_types.h>
#include <net/route.h>
#include <net/bpf.h>
#include <netinet/tcp.h>
#include <netinet/tcp_seq.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#endif
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/nd6.h>
#endif /* INET6 */
#ifdef __FreeBSD__
#include "opt_carp.h"
#ifdef DEV_CARP
#define NCARP 1
#else
#define NCARP 0
#endif
#else
#include "carp.h"
#endif
#if NCARP > 0
extern int carp_suppress_preempt;
#endif
#include <net/pfvar.h>
#include <net/if_pfsync.h>
#ifdef __FreeBSD__
#define PFSYNCNAME "pfsync"
#endif
#define PFSYNC_MINMTU \
(sizeof(struct pfsync_header) + sizeof(struct pf_state))
#ifdef PFSYNCDEBUG
#define DPRINTF(x) do { if (pfsyncdebug) printf x ; } while (0)
int pfsyncdebug;
#else
#define DPRINTF(x)
#endif
#ifndef __FreeBSD__
struct pfsync_softc pfsyncif;
#endif
struct pfsyncstats pfsyncstats;
#ifdef __FreeBSD__
SYSCTL_DECL(_net_inet_pfsync);
SYSCTL_STRUCT(_net_inet_pfsync, 0, stats, CTLFLAG_RW,
&pfsyncstats, pfsyncstats,
"PFSYNC statistics (struct pfsyncstats, net/if_pfsync.h)");
/*
* Locking notes:
* Whenever we really touch/look at the state table we have to hold the
* PF_LOCK. Functions that do just the interface handling, grab the per
* softc lock instead.
*
*/
static void pfsync_clone_destroy(struct ifnet *);
static int pfsync_clone_create(struct if_clone *, int, caddr_t params);
static void pfsync_senddef(void *);
#else
void pfsyncattach(int);
#endif
void pfsync_setmtu(struct pfsync_softc *, int);
int pfsync_insert_net_state(struct pfsync_state *);
int pfsyncoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
int pfsyncioctl(struct ifnet *, u_long, caddr_t);
void pfsyncstart(struct ifnet *);
struct mbuf *pfsync_get_mbuf(struct pfsync_softc *, u_int8_t, void **);
int pfsync_request_update(struct pfsync_state_upd *, struct in_addr *);
int pfsync_sendout(struct pfsync_softc *);
void pfsync_timeout(void *);
void pfsync_send_bus(struct pfsync_softc *, u_int8_t);
void pfsync_bulk_update(void *);
void pfsync_bulkfail(void *);
int pfsync_sync_ok;
#ifndef __FreeBSD__
extern int ifqmaxlen;
extern struct timeval time;
extern struct timeval mono_time;
extern int hz;
#endif
#ifdef __FreeBSD__
static MALLOC_DEFINE(M_PFSYNC, PFSYNCNAME, "Packet Filter State Sync. Interface");
static LIST_HEAD(pfsync_list, pfsync_softc) pfsync_list;
#define SCP2IFP(sc) ((sc)->sc_ifp)
IFC_SIMPLE_DECLARE(pfsync, 1);
static void
pfsync_clone_destroy(struct ifnet *ifp)
{
struct pfsync_softc *sc;
sc = ifp->if_softc;
callout_stop(&sc->sc_tmo);
callout_stop(&sc->sc_bulk_tmo);
callout_stop(&sc->sc_bulkfail_tmo);
callout_stop(&sc->sc_send_tmo);
#if NBPFILTER > 0
bpfdetach(ifp);
#endif
if_detach(ifp);
if_free(ifp);
LIST_REMOVE(sc, sc_next);
free(sc->sc_imo.imo_membership, M_PFSYNC);
free(sc, M_PFSYNC);
}
static int
#ifdef __FreeBSD__
pfsync_clone_create(struct if_clone *ifc, int unit, caddr_t params)
#else
pfsync_clone_create(struct if_clone *ifc, int unit)
#endif
{
struct pfsync_softc *sc;
struct ifnet *ifp;
MALLOC(sc, struct pfsync_softc *, sizeof(*sc), M_PFSYNC,
M_WAITOK|M_ZERO);
ifp = sc->sc_ifp = if_alloc(IFT_PFSYNC);
if (ifp == NULL) {
free(sc, M_PFSYNC);
return (ENOSPC);
}
pfsync_sync_ok = 1;
sc->sc_mbuf = NULL;
sc->sc_mbuf_net = NULL;
sc->sc_statep.s = NULL;
sc->sc_statep_net.s = NULL;
sc->sc_maxupdates = 128;
sc->sc_sync_peer.s_addr = htonl(INADDR_PFSYNC_GROUP);
sc->sc_sendaddr.s_addr = htonl(INADDR_PFSYNC_GROUP);
sc->sc_ureq_received = 0;
sc->sc_ureq_sent = 0;
sc->sc_imo.imo_membership = (struct in_multi **)malloc(
(sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_PFSYNC,
M_WAITOK);
sc->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS;
ifp = SCP2IFP(sc);
if_initname(ifp, ifc->ifc_name, unit);
ifp->if_ioctl = pfsyncioctl;
ifp->if_output = pfsyncoutput;
ifp->if_start = pfsyncstart;
ifp->if_snd.ifq_maxlen = ifqmaxlen;
ifp->if_hdrlen = PFSYNC_HDRLEN;
ifp->if_baudrate = IF_Mbps(100);
ifp->if_softc = sc;
pfsync_setmtu(sc, MCLBYTES);
callout_init(&sc->sc_tmo, NET_CALLOUT_MPSAFE);
callout_init(&sc->sc_bulk_tmo, NET_CALLOUT_MPSAFE);
callout_init(&sc->sc_bulkfail_tmo, NET_CALLOUT_MPSAFE);
callout_init(&sc->sc_send_tmo, NET_CALLOUT_MPSAFE);
sc->sc_ifq.ifq_maxlen = ifqmaxlen;
mtx_init(&sc->sc_ifq.ifq_mtx, ifp->if_xname, "pfsync send queue",
MTX_DEF);
if_attach(ifp);
LIST_INSERT_HEAD(&pfsync_list, sc, sc_next);
#if NBPFILTER > 0
bpfattach(ifp, DLT_PFSYNC, PFSYNC_HDRLEN);
#endif
return (0);
}
#else /* !__FreeBSD__ */
void
pfsyncattach(int npfsync)
{
struct ifnet *ifp;
pfsync_sync_ok = 1;
bzero(&pfsyncif, sizeof(pfsyncif));
pfsyncif.sc_mbuf = NULL;
pfsyncif.sc_mbuf_net = NULL;
pfsyncif.sc_statep.s = NULL;
pfsyncif.sc_statep_net.s = NULL;
pfsyncif.sc_maxupdates = 128;
pfsyncif.sc_sync_peer.s_addr = INADDR_PFSYNC_GROUP;
pfsyncif.sc_sendaddr.s_addr = INADDR_PFSYNC_GROUP;
pfsyncif.sc_ureq_received = 0;
pfsyncif.sc_ureq_sent = 0;
ifp = &pfsyncif.sc_if;
strlcpy(ifp->if_xname, "pfsync0", sizeof ifp->if_xname);
ifp->if_softc = &pfsyncif;
ifp->if_ioctl = pfsyncioctl;
ifp->if_output = pfsyncoutput;
ifp->if_start = pfsyncstart;
ifp->if_type = IFT_PFSYNC;
ifp->if_snd.ifq_maxlen = ifqmaxlen;
ifp->if_hdrlen = PFSYNC_HDRLEN;
pfsync_setmtu(&pfsyncif, MCLBYTES);
timeout_set(&pfsyncif.sc_tmo, pfsync_timeout, &pfsyncif);
timeout_set(&pfsyncif.sc_bulk_tmo, pfsync_bulk_update, &pfsyncif);
timeout_set(&pfsyncif.sc_bulkfail_tmo, pfsync_bulkfail, &pfsyncif);
if_attach(ifp);
if_alloc_sadl(ifp);
#if NBPFILTER > 0
bpfattach(&pfsyncif.sc_if.if_bpf, ifp, DLT_PFSYNC, PFSYNC_HDRLEN);
#endif
}
#endif
/*
* Start output on the pfsync interface.
*/
void
pfsyncstart(struct ifnet *ifp)
{
#ifdef __FreeBSD__
IF_LOCK(&ifp->if_snd);
_IF_DROP(&ifp->if_snd);
_IF_DRAIN(&ifp->if_snd);
IF_UNLOCK(&ifp->if_snd);
#else
struct mbuf *m;
int s;
for (;;) {
s = splimp();
IF_DROP(&ifp->if_snd);
IF_DEQUEUE(&ifp->if_snd, m);
splx(s);
if (m == NULL)
return;
else
m_freem(m);
}
#endif
}
int
pfsync_insert_net_state(struct pfsync_state *sp)
{
struct pf_state *st = NULL;
struct pf_rule *r = NULL;
struct pfi_kif *kif;
#ifdef __FreeBSD__
PF_ASSERT(MA_OWNED);
#endif
if (sp->creatorid == 0 && pf_status.debug >= PF_DEBUG_MISC) {
printf("pfsync_insert_net_state: invalid creator id:"
" %08x\n", ntohl(sp->creatorid));
return (EINVAL);
}
kif = pfi_lookup_create(sp->ifname);
if (kif == NULL) {
if (pf_status.debug >= PF_DEBUG_MISC)
printf("pfsync_insert_net_state: "
"unknown interface: %s\n", sp->ifname);
/* skip this state */
return (0);
}
/*
* Just use the default rule until we have infrastructure to find the
* best matching rule.
*/
r = &pf_default_rule;
if (!r->max_states || r->states < r->max_states)
st = pool_get(&pf_state_pl, PR_NOWAIT);
if (st == NULL) {
pfi_maybe_destroy(kif);
return (ENOMEM);
}
bzero(st, sizeof(*st));
st->rule.ptr = r;
/* XXX get pointers to nat_rule and anchor */
/* XXX when we have nat_rule/anchors, use STATE_INC_COUNTERS */
r->states++;
/* fill in the rest of the state entry */
pf_state_host_ntoh(&sp->lan, &st->lan);
pf_state_host_ntoh(&sp->gwy, &st->gwy);
pf_state_host_ntoh(&sp->ext, &st->ext);
pf_state_peer_ntoh(&sp->src, &st->src);
pf_state_peer_ntoh(&sp->dst, &st->dst);
bcopy(&sp->rt_addr, &st->rt_addr, sizeof(st->rt_addr));
st->creation = time_second - ntohl(sp->creation);
st->expire = ntohl(sp->expire) + time_second;
st->af = sp->af;
st->proto = sp->proto;
st->direction = sp->direction;
st->log = sp->log;
st->timeout = sp->timeout;
st->allow_opts = sp->allow_opts;
bcopy(sp->id, &st->id, sizeof(st->id));
st->creatorid = sp->creatorid;
st->sync_flags = PFSTATE_FROMSYNC;
if (pf_insert_state(kif, st)) {
pfi_maybe_destroy(kif);
/* XXX when we have nat_rule/anchors, use STATE_DEC_COUNTERS */
r->states--;
pool_put(&pf_state_pl, st);
return (EINVAL);
}
return (0);
}
void
#ifdef __FreeBSD__
pfsync_input(struct mbuf *m, __unused int off)
#else
pfsync_input(struct mbuf *m, ...)
#endif
{
struct ip *ip = mtod(m, struct ip *);
struct pfsync_header *ph;
#ifdef __FreeBSD__
struct pfsync_softc *sc = LIST_FIRST(&pfsync_list);
#else
struct pfsync_softc *sc = &pfsyncif;
#endif
struct pf_state *st, key;
struct pfsync_state *sp;
struct pfsync_state_upd *up;
struct pfsync_state_del *dp;
struct pfsync_state_clr *cp;
struct pfsync_state_upd_req *rup;
struct pfsync_state_bus *bus;
struct in_addr src;
struct mbuf *mp;
int iplen, action, error, i, s, count, offp, sfail, stale = 0;
pfsyncstats.pfsyncs_ipackets++;
/* verify that we have a sync interface configured */
if (!sc->sc_sync_ifp || !pf_status.running) /* XXX PF_LOCK? */
goto done;
/* verify that the packet came in on the right interface */
if (sc->sc_sync_ifp != m->m_pkthdr.rcvif) {
pfsyncstats.pfsyncs_badif++;
goto done;
}
/* verify that the IP TTL is 255. */
if (ip->ip_ttl != PFSYNC_DFLTTL) {
pfsyncstats.pfsyncs_badttl++;
goto done;
}
iplen = ip->ip_hl << 2;
if (m->m_pkthdr.len < iplen + sizeof(*ph)) {
pfsyncstats.pfsyncs_hdrops++;
goto done;
}
if (iplen + sizeof(*ph) > m->m_len) {
if ((m = m_pullup(m, iplen + sizeof(*ph))) == NULL) {
pfsyncstats.pfsyncs_hdrops++;
goto done;
}
ip = mtod(m, struct ip *);
}
ph = (struct pfsync_header *)((char *)ip + iplen);
/* verify the version */
if (ph->version != PFSYNC_VERSION) {
pfsyncstats.pfsyncs_badver++;
goto done;
}
action = ph->action;
count = ph->count;
/* make sure it's a valid action code */
if (action >= PFSYNC_ACT_MAX) {
pfsyncstats.pfsyncs_badact++;
goto done;
}
/* Cheaper to grab this now than having to mess with mbufs later */
src = ip->ip_src;
switch (action) {
case PFSYNC_ACT_CLR: {
struct pf_state *nexts;
struct pfi_kif *kif;
u_int32_t creatorid;
if ((mp = m_pulldown(m, iplen + sizeof(*ph),
sizeof(*cp), &offp)) == NULL) {
pfsyncstats.pfsyncs_badlen++;
return;
}
cp = (struct pfsync_state_clr *)(mp->m_data + offp);
creatorid = cp->creatorid;
s = splsoftnet();
#ifdef __FreeBSD__
PF_LOCK();
#endif
if (cp->ifname[0] == '\0') {
for (st = RB_MIN(pf_state_tree_id, &tree_id);
st; st = nexts) {
nexts = RB_NEXT(pf_state_tree_id, &tree_id, st);
if (st->creatorid == creatorid) {
st->timeout = PFTM_PURGE;
pf_purge_expired_state(st);
}
}
} else {
kif = pfi_lookup_if(cp->ifname);
if (kif == NULL) {
if (pf_status.debug >= PF_DEBUG_MISC)
printf("pfsync_input: PFSYNC_ACT_CLR "
"bad interface: %s\n", cp->ifname);
splx(s);
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
goto done;
}
for (st = RB_MIN(pf_state_tree_lan_ext,
&kif->pfik_lan_ext); st; st = nexts) {
nexts = RB_NEXT(pf_state_tree_lan_ext,
&kif->pfik_lan_ext, st);
if (st->creatorid == creatorid) {
st->timeout = PFTM_PURGE;
pf_purge_expired_state(st);
}
}
}
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
splx(s);
break;
}
case PFSYNC_ACT_INS:
if ((mp = m_pulldown(m, iplen + sizeof(*ph),
count * sizeof(*sp), &offp)) == NULL) {
pfsyncstats.pfsyncs_badlen++;
return;
}
s = splsoftnet();
#ifdef __FreeBSD__
PF_LOCK();
#endif
for (i = 0, sp = (struct pfsync_state *)(mp->m_data + offp);
i < count; i++, sp++) {
/* check for invalid values */
if (sp->timeout >= PFTM_MAX ||
sp->src.state > PF_TCPS_PROXY_DST ||
sp->dst.state > PF_TCPS_PROXY_DST ||
sp->direction > PF_OUT ||
(sp->af != AF_INET && sp->af != AF_INET6)) {
if (pf_status.debug >= PF_DEBUG_MISC)
printf("pfsync_insert: PFSYNC_ACT_INS: "
"invalid value\n");
pfsyncstats.pfsyncs_badstate++;
continue;
}
if ((error = pfsync_insert_net_state(sp))) {
if (error == ENOMEM) {
splx(s);
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
goto done;
}
continue;
}
}
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
splx(s);
break;
case PFSYNC_ACT_UPD:
if ((mp = m_pulldown(m, iplen + sizeof(*ph),
count * sizeof(*sp), &offp)) == NULL) {
pfsyncstats.pfsyncs_badlen++;
return;
}
s = splsoftnet();
#ifdef __FreeBSD__
PF_LOCK();
#endif
for (i = 0, sp = (struct pfsync_state *)(mp->m_data + offp);
i < count; i++, sp++) {
int flags = PFSYNC_FLAG_STALE;
/* check for invalid values */
if (sp->timeout >= PFTM_MAX ||
sp->src.state > PF_TCPS_PROXY_DST ||
sp->dst.state > PF_TCPS_PROXY_DST) {
if (pf_status.debug >= PF_DEBUG_MISC)
printf("pfsync_insert: PFSYNC_ACT_UPD: "
"invalid value\n");
pfsyncstats.pfsyncs_badstate++;
continue;
}
bcopy(sp->id, &key.id, sizeof(key.id));
key.creatorid = sp->creatorid;
st = pf_find_state_byid(&key);
if (st == NULL) {
/* insert the update */
if (pfsync_insert_net_state(sp))
pfsyncstats.pfsyncs_badstate++;
continue;
}
sfail = 0;
if (st->proto == IPPROTO_TCP) {
/*
* The state should never go backwards except
* for syn-proxy states. Neither should the
* sequence window slide backwards.
*/
if (st->src.state > sp->src.state &&
(st->src.state < PF_TCPS_PROXY_SRC ||
sp->src.state >= PF_TCPS_PROXY_SRC))
sfail = 1;
else if (SEQ_GT(st->src.seqlo,
ntohl(sp->src.seqlo)))
sfail = 3;
else if (st->dst.state > sp->dst.state) {
/* There might still be useful
* information about the src state here,
* so import that part of the update,
* then "fail" so we send the updated
* state back to the peer who is missing
* our what we know. */
pf_state_peer_ntoh(&sp->src, &st->src);
/* XXX do anything with timeouts? */
sfail = 7;
flags = 0;
} else if (st->dst.state >= TCPS_SYN_SENT &&
SEQ_GT(st->dst.seqlo, ntohl(sp->dst.seqlo)))
sfail = 4;
} else {
/*
* Non-TCP protocol state machine always go
* forwards
*/
if (st->src.state > sp->src.state)
sfail = 5;
else if ( st->dst.state > sp->dst.state)
sfail = 6;
}
if (sfail) {
if (pf_status.debug >= PF_DEBUG_MISC)
printf("pfsync: %s stale update "
"(%d) id: %016llx "
"creatorid: %08x\n",
(sfail < 7 ? "ignoring"
: "partial"), sfail,
#ifdef __FreeBSD__
(unsigned long long)be64toh(st->id),
#else
betoh64(st->id),
#endif
ntohl(st->creatorid));
pfsyncstats.pfsyncs_badstate++;
if (!(sp->sync_flags & PFSTATE_STALE)) {
/* we have a better state, send it */
if (sc->sc_mbuf != NULL && !stale)
pfsync_sendout(sc);
stale++;
if (!st->sync_flags)
pfsync_pack_state(
PFSYNC_ACT_UPD, st, flags);
}
continue;
}
pf_state_peer_ntoh(&sp->src, &st->src);
pf_state_peer_ntoh(&sp->dst, &st->dst);
st->expire = ntohl(sp->expire) + time_second;
st->timeout = sp->timeout;
}
if (stale && sc->sc_mbuf != NULL)
pfsync_sendout(sc);
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
splx(s);
break;
/*
* It's not strictly necessary for us to support the "uncompressed"
* delete action, but it's relatively simple and maintains consistency.
*/
case PFSYNC_ACT_DEL:
if ((mp = m_pulldown(m, iplen + sizeof(*ph),
count * sizeof(*sp), &offp)) == NULL) {
pfsyncstats.pfsyncs_badlen++;
return;
}
s = splsoftnet();
#ifdef __FreeBSD__
PF_LOCK();
#endif
for (i = 0, sp = (struct pfsync_state *)(mp->m_data + offp);
i < count; i++, sp++) {
bcopy(sp->id, &key.id, sizeof(key.id));
key.creatorid = sp->creatorid;
st = pf_find_state_byid(&key);
if (st == NULL) {
pfsyncstats.pfsyncs_badstate++;
continue;
}
st->timeout = PFTM_PURGE;
st->sync_flags |= PFSTATE_FROMSYNC;
pf_purge_expired_state(st);
}
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
splx(s);
break;
case PFSYNC_ACT_UPD_C: {
int update_requested = 0;
if ((mp = m_pulldown(m, iplen + sizeof(*ph),
count * sizeof(*up), &offp)) == NULL) {
pfsyncstats.pfsyncs_badlen++;
return;
}
s = splsoftnet();
#ifdef __FreeBSD__
PF_LOCK();
#endif
for (i = 0, up = (struct pfsync_state_upd *)(mp->m_data + offp);
i < count; i++, up++) {
/* check for invalid values */
if (up->timeout >= PFTM_MAX ||
up->src.state > PF_TCPS_PROXY_DST ||
up->dst.state > PF_TCPS_PROXY_DST) {
if (pf_status.debug >= PF_DEBUG_MISC)
printf("pfsync_insert: "
"PFSYNC_ACT_UPD_C: "
"invalid value\n");
pfsyncstats.pfsyncs_badstate++;
continue;
}
bcopy(up->id, &key.id, sizeof(key.id));
key.creatorid = up->creatorid;
st = pf_find_state_byid(&key);
if (st == NULL) {
/* We don't have this state. Ask for it. */
error = pfsync_request_update(up, &src);
if (error == ENOMEM) {
splx(s);
goto done;
}
update_requested = 1;
pfsyncstats.pfsyncs_badstate++;
continue;
}
sfail = 0;
if (st->proto == IPPROTO_TCP) {
/*
* The state should never go backwards except
* for syn-proxy states. Neither should the
* sequence window slide backwards.
*/
if (st->src.state > up->src.state &&
(st->src.state < PF_TCPS_PROXY_SRC ||
up->src.state >= PF_TCPS_PROXY_SRC))
sfail = 1;
else if (st->dst.state > up->dst.state)
sfail = 2;
else if (SEQ_GT(st->src.seqlo,
ntohl(up->src.seqlo)))
sfail = 3;
else if (st->dst.state >= TCPS_SYN_SENT &&
SEQ_GT(st->dst.seqlo, ntohl(up->dst.seqlo)))
sfail = 4;
} else {
/*
* Non-TCP protocol state machine always go
* forwards
*/
if (st->src.state > up->src.state)
sfail = 5;
else if (st->dst.state > up->dst.state)
sfail = 6;
}
if (sfail) {
if (pf_status.debug >= PF_DEBUG_MISC)
printf("pfsync: ignoring stale update "
"(%d) id: %016llx "
"creatorid: %08x\n", sfail,
#ifdef __FreeBSD__
(unsigned long long)be64toh(st->id),
#else
betoh64(st->id),
#endif
ntohl(st->creatorid));
pfsyncstats.pfsyncs_badstate++;
/* we have a better state, send it out */
if ((!stale || update_requested) &&
sc->sc_mbuf != NULL) {
pfsync_sendout(sc);
update_requested = 0;
}
stale++;
if (!st->sync_flags)
pfsync_pack_state(PFSYNC_ACT_UPD, st,
PFSYNC_FLAG_STALE);
continue;
}
pf_state_peer_ntoh(&up->src, &st->src);
pf_state_peer_ntoh(&up->dst, &st->dst);
st->expire = ntohl(up->expire) + time_second;
st->timeout = up->timeout;
}
if ((update_requested || stale) && sc->sc_mbuf)
pfsync_sendout(sc);
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
splx(s);
break;
}
case PFSYNC_ACT_DEL_C:
if ((mp = m_pulldown(m, iplen + sizeof(*ph),
count * sizeof(*dp), &offp)) == NULL) {
pfsyncstats.pfsyncs_badlen++;
return;
}
s = splsoftnet();
#ifdef __FreeBSD__
PF_LOCK();
#endif
for (i = 0, dp = (struct pfsync_state_del *)(mp->m_data + offp);
i < count; i++, dp++) {
bcopy(dp->id, &key.id, sizeof(key.id));
key.creatorid = dp->creatorid;
st = pf_find_state_byid(&key);
if (st == NULL) {
pfsyncstats.pfsyncs_badstate++;
continue;
}
st->timeout = PFTM_PURGE;
st->sync_flags |= PFSTATE_FROMSYNC;
pf_purge_expired_state(st);
}
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
splx(s);
break;
case PFSYNC_ACT_INS_F:
case PFSYNC_ACT_DEL_F:
/* not implemented */
break;
case PFSYNC_ACT_UREQ:
if ((mp = m_pulldown(m, iplen + sizeof(*ph),
count * sizeof(*rup), &offp)) == NULL) {
pfsyncstats.pfsyncs_badlen++;
return;
}
s = splsoftnet();
#ifdef __FreeBSD__
PF_LOCK();
#endif
if (sc->sc_mbuf != NULL)
pfsync_sendout(sc);
for (i = 0,
rup = (struct pfsync_state_upd_req *)(mp->m_data + offp);
i < count; i++, rup++) {
bcopy(rup->id, &key.id, sizeof(key.id));
key.creatorid = rup->creatorid;
if (key.id == 0 && key.creatorid == 0) {
sc->sc_ureq_received = time_uptime;
if (pf_status.debug >= PF_DEBUG_MISC)
printf("pfsync: received "
"bulk update request\n");
pfsync_send_bus(sc, PFSYNC_BUS_START);
#ifdef __FreeBSD__
callout_reset(&sc->sc_bulk_tmo, 1 * hz,
pfsync_bulk_update,
LIST_FIRST(&pfsync_list));
#else
timeout_add(&sc->sc_bulk_tmo, 1 * hz);
#endif
} else {
st = pf_find_state_byid(&key);
if (st == NULL) {
pfsyncstats.pfsyncs_badstate++;
continue;
}
if (!st->sync_flags)
pfsync_pack_state(PFSYNC_ACT_UPD,
st, 0);
}
}
if (sc->sc_mbuf != NULL)
pfsync_sendout(sc);
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
splx(s);
break;
case PFSYNC_ACT_BUS:
/* If we're not waiting for a bulk update, who cares. */
if (sc->sc_ureq_sent == 0)
break;
if ((mp = m_pulldown(m, iplen + sizeof(*ph),
sizeof(*bus), &offp)) == NULL) {
pfsyncstats.pfsyncs_badlen++;
return;
}
bus = (struct pfsync_state_bus *)(mp->m_data + offp);
switch (bus->status) {
case PFSYNC_BUS_START:
#ifdef __FreeBSD__
callout_reset(&sc->sc_bulkfail_tmo,
pf_pool_limits[PF_LIMIT_STATES].limit /
(PFSYNC_BULKPACKETS * sc->sc_maxcount),
pfsync_bulkfail, LIST_FIRST(&pfsync_list));
#else
timeout_add(&sc->sc_bulkfail_tmo,
pf_pool_limits[PF_LIMIT_STATES].limit /
(PFSYNC_BULKPACKETS * sc->sc_maxcount));
#endif
if (pf_status.debug >= PF_DEBUG_MISC)
printf("pfsync: received bulk "
"update start\n");
break;
case PFSYNC_BUS_END:
if (time_uptime - ntohl(bus->endtime) >=
sc->sc_ureq_sent) {
/* that's it, we're happy */
sc->sc_ureq_sent = 0;
sc->sc_bulk_tries = 0;
#ifdef __FreeBSD__
callout_stop(&sc->sc_bulkfail_tmo);
#else
timeout_del(&sc->sc_bulkfail_tmo);
#endif
#if NCARP > 0 /* XXX_IMPORT */
if (!pfsync_sync_ok)
carp_suppress_preempt--;
#endif
pfsync_sync_ok = 1;
if (pf_status.debug >= PF_DEBUG_MISC)
printf("pfsync: received valid "
"bulk update end\n");
} else {
if (pf_status.debug >= PF_DEBUG_MISC)
printf("pfsync: received invalid "
"bulk update end: bad timestamp\n");
}
break;
}
break;
}
done:
if (m)
m_freem(m);
}
int
pfsyncoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
struct rtentry *rt)
{
m_freem(m);
return (0);
}
/* ARGSUSED */
int
pfsyncioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
#ifndef __FreeBSD__
struct proc *p = curproc;
#endif
struct pfsync_softc *sc = ifp->if_softc;
struct ifreq *ifr = (struct ifreq *)data;
struct ip_moptions *imo = &sc->sc_imo;
struct pfsyncreq pfsyncr;
struct ifnet *sifp;
int s, error;
switch (cmd) {
case SIOCSIFADDR:
case SIOCAIFADDR:
case SIOCSIFDSTADDR:
case SIOCSIFFLAGS:
#ifdef __FreeBSD__
if (ifp->if_flags & IFF_UP)
ifp->if_drv_flags |= IFF_DRV_RUNNING;
else
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
#else
if (ifp->if_flags & IFF_UP)
ifp->if_flags |= IFF_RUNNING;
else
ifp->if_flags &= ~IFF_RUNNING;
#endif
break;
case SIOCSIFMTU:
if (ifr->ifr_mtu < PFSYNC_MINMTU)
return (EINVAL);
if (ifr->ifr_mtu > MCLBYTES)
ifr->ifr_mtu = MCLBYTES;
s = splnet();
#ifdef __FreeBSD__
PF_LOCK();
#endif
if (ifr->ifr_mtu < ifp->if_mtu) {
pfsync_sendout(sc);
}
pfsync_setmtu(sc, ifr->ifr_mtu);
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
splx(s);
break;
case SIOCGETPFSYNC:
#ifdef __FreeBSD__
/* XXX: read unlocked */
#endif
bzero(&pfsyncr, sizeof(pfsyncr));
if (sc->sc_sync_ifp)
strlcpy(pfsyncr.pfsyncr_syncdev,
sc->sc_sync_ifp->if_xname, IFNAMSIZ);
pfsyncr.pfsyncr_syncpeer = sc->sc_sync_peer;
pfsyncr.pfsyncr_maxupdates = sc->sc_maxupdates;
if ((error = copyout(&pfsyncr, ifr->ifr_data, sizeof(pfsyncr))))
return (error);
break;
case SIOCSETPFSYNC:
#ifdef __FreeBSD__
if ((error = priv_check(curthread, PRIV_NETINET_PF)) != 0)
#else
if ((error = suser(p, p->p_acflag)) != 0)
#endif
return (error);
if ((error = copyin(ifr->ifr_data, &pfsyncr, sizeof(pfsyncr))))
return (error);
if (pfsyncr.pfsyncr_syncpeer.s_addr == 0)
#ifdef __FreeBSD__
sc->sc_sync_peer.s_addr = htonl(INADDR_PFSYNC_GROUP);
#else
sc->sc_sync_peer.s_addr = INADDR_PFSYNC_GROUP;
#endif
else
sc->sc_sync_peer.s_addr =
pfsyncr.pfsyncr_syncpeer.s_addr;
if (pfsyncr.pfsyncr_maxupdates > 255)
return (EINVAL);
#ifdef __FreeBSD__
callout_drain(&sc->sc_send_tmo);
PF_LOCK();
#endif
sc->sc_maxupdates = pfsyncr.pfsyncr_maxupdates;
if (pfsyncr.pfsyncr_syncdev[0] == 0) {
sc->sc_sync_ifp = NULL;
if (sc->sc_mbuf_net != NULL) {
/* Don't keep stale pfsync packets around. */
s = splnet();
m_freem(sc->sc_mbuf_net);
sc->sc_mbuf_net = NULL;
sc->sc_statep_net.s = NULL;
splx(s);
}
if (imo->imo_num_memberships > 0) {
in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
imo->imo_multicast_ifp = NULL;
}
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
break;
}
if ((sifp = ifunit(pfsyncr.pfsyncr_syncdev)) == NULL) {
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
return (EINVAL);
}
s = splnet();
#ifdef __FreeBSD__
if (sifp->if_mtu < SCP2IFP(sc)->if_mtu ||
#else
if (sifp->if_mtu < sc->sc_if.if_mtu ||
#endif
(sc->sc_sync_ifp != NULL &&
sifp->if_mtu < sc->sc_sync_ifp->if_mtu) ||
sifp->if_mtu < MCLBYTES - sizeof(struct ip))
pfsync_sendout(sc);
sc->sc_sync_ifp = sifp;
#ifdef __FreeBSD__
pfsync_setmtu(sc, SCP2IFP(sc)->if_mtu);
#else
pfsync_setmtu(sc, sc->sc_if.if_mtu);
#endif
if (imo->imo_num_memberships > 0) {
in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
imo->imo_multicast_ifp = NULL;
}
if (sc->sc_sync_ifp &&
#ifdef __FreeBSD__
sc->sc_sync_peer.s_addr == htonl(INADDR_PFSYNC_GROUP)) {
#else
sc->sc_sync_peer.s_addr == INADDR_PFSYNC_GROUP) {
#endif
struct in_addr addr;
if (!(sc->sc_sync_ifp->if_flags & IFF_MULTICAST)) {
sc->sc_sync_ifp = NULL;
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
splx(s);
return (EADDRNOTAVAIL);
}
#ifdef __FreeBSD__
PF_UNLOCK(); /* addmulti mallocs w/ WAITOK */
addr.s_addr = htonl(INADDR_PFSYNC_GROUP);
#else
addr.s_addr = INADDR_PFSYNC_GROUP;
#endif
if ((imo->imo_membership[0] =
in_addmulti(&addr, sc->sc_sync_ifp)) == NULL) {
sc->sc_sync_ifp = NULL;
splx(s);
return (ENOBUFS);
}
imo->imo_num_memberships++;
imo->imo_multicast_ifp = sc->sc_sync_ifp;
imo->imo_multicast_ttl = PFSYNC_DFLTTL;
imo->imo_multicast_loop = 0;
#ifdef __FreeBSD__
PF_LOCK();
#endif
}
if (sc->sc_sync_ifp ||
#ifdef __FreeBSD__
sc->sc_sendaddr.s_addr != htonl(INADDR_PFSYNC_GROUP)) {
#else
sc->sc_sendaddr.s_addr != INADDR_PFSYNC_GROUP) {
#endif
/* Request a full state table update. */
sc->sc_ureq_sent = time_uptime;
#if NCARP > 0
if (pfsync_sync_ok)
carp_suppress_preempt++;
#endif
pfsync_sync_ok = 0;
if (pf_status.debug >= PF_DEBUG_MISC)
printf("pfsync: requesting bulk update\n");
#ifdef __FreeBSD__
callout_reset(&sc->sc_bulkfail_tmo, 5 * hz,
pfsync_bulkfail, LIST_FIRST(&pfsync_list));
#else
timeout_add(&sc->sc_bulkfail_tmo, 5 * hz);
#endif
error = pfsync_request_update(NULL, NULL);
if (error == ENOMEM) {
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
splx(s);
return (ENOMEM);
}
pfsync_sendout(sc);
}
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
splx(s);
break;
default:
return (ENOTTY);
}
return (0);
}
void
pfsync_setmtu(struct pfsync_softc *sc, int mtu_req)
{
int mtu;
if (sc->sc_sync_ifp && sc->sc_sync_ifp->if_mtu < mtu_req)
mtu = sc->sc_sync_ifp->if_mtu;
else
mtu = mtu_req;
sc->sc_maxcount = (mtu - sizeof(struct pfsync_header)) /
sizeof(struct pfsync_state);
if (sc->sc_maxcount > 254)
sc->sc_maxcount = 254;
#ifdef __FreeBSD__
SCP2IFP(sc)->if_mtu = sizeof(struct pfsync_header) +
sc->sc_maxcount * sizeof(struct pfsync_state);
#else
sc->sc_if.if_mtu = sizeof(struct pfsync_header) +
sc->sc_maxcount * sizeof(struct pfsync_state);
#endif
}
struct mbuf *
pfsync_get_mbuf(struct pfsync_softc *sc, u_int8_t action, void **sp)
{
struct pfsync_header *h;
struct mbuf *m;
int len;
#ifdef __FreeBSD__
PF_ASSERT(MA_OWNED);
#endif
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL) {
#ifdef __FreeBSD__
SCP2IFP(sc)->if_oerrors++;
#else
sc->sc_if.if_oerrors++;
#endif
return (NULL);
}
switch (action) {
case PFSYNC_ACT_CLR:
len = sizeof(struct pfsync_header) +
sizeof(struct pfsync_state_clr);
break;
case PFSYNC_ACT_UPD_C:
len = (sc->sc_maxcount * sizeof(struct pfsync_state_upd)) +
sizeof(struct pfsync_header);
break;
case PFSYNC_ACT_DEL_C:
len = (sc->sc_maxcount * sizeof(struct pfsync_state_del)) +
sizeof(struct pfsync_header);
break;
case PFSYNC_ACT_UREQ:
len = (sc->sc_maxcount * sizeof(struct pfsync_state_upd_req)) +
sizeof(struct pfsync_header);
break;
case PFSYNC_ACT_BUS:
len = sizeof(struct pfsync_header) +
sizeof(struct pfsync_state_bus);
break;
default:
len = (sc->sc_maxcount * sizeof(struct pfsync_state)) +
sizeof(struct pfsync_header);
break;
}
if (len > MHLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_free(m);
#ifdef __FreeBSD__
SCP2IFP(sc)->if_oerrors++;
#else
sc->sc_if.if_oerrors++;
#endif
return (NULL);
}
m->m_data += (MCLBYTES - len) &~ (sizeof(long) - 1);
} else
MH_ALIGN(m, len);
m->m_pkthdr.rcvif = NULL;
m->m_pkthdr.len = m->m_len = sizeof(struct pfsync_header);
h = mtod(m, struct pfsync_header *);
h->version = PFSYNC_VERSION;
h->af = 0;
h->count = 0;
h->action = action;
*sp = (void *)((char *)h + PFSYNC_HDRLEN);
#ifdef __FreeBSD__
callout_reset(&sc->sc_tmo, hz, pfsync_timeout,
LIST_FIRST(&pfsync_list));
#else
timeout_add(&sc->sc_tmo, hz);
#endif
return (m);
}
int
pfsync_pack_state(u_int8_t action, struct pf_state *st, int flags)
{
#ifdef __FreeBSD__
struct ifnet *ifp = SCP2IFP(LIST_FIRST(&pfsync_list));
#else
struct ifnet *ifp = &pfsyncif.sc_if;
#endif
struct pfsync_softc *sc = ifp->if_softc;
struct pfsync_header *h, *h_net;
struct pfsync_state *sp = NULL;
struct pfsync_state_upd *up = NULL;
struct pfsync_state_del *dp = NULL;
struct pf_rule *r;
u_long secs;
int s, ret = 0;
u_int8_t i = 255, newaction = 0;
#ifdef __FreeBSD__
PF_ASSERT(MA_OWNED);
#endif
/*
* If a packet falls in the forest and there's nobody around to
* hear, does it make a sound?
*/
if (ifp->if_bpf == NULL && sc->sc_sync_ifp == NULL &&
#ifdef __FreeBSD__
sc->sc_sync_peer.s_addr == htonl(INADDR_PFSYNC_GROUP)) {
#else
sc->sc_sync_peer.s_addr == INADDR_PFSYNC_GROUP) {
#endif
/* Don't leave any stale pfsync packets hanging around. */
if (sc->sc_mbuf != NULL) {
m_freem(sc->sc_mbuf);
sc->sc_mbuf = NULL;
sc->sc_statep.s = NULL;
}
return (0);
}
if (action >= PFSYNC_ACT_MAX)
return (EINVAL);
s = splnet();
if (sc->sc_mbuf == NULL) {
if ((sc->sc_mbuf = pfsync_get_mbuf(sc, action,
(void *)&sc->sc_statep.s)) == NULL) {
splx(s);
return (ENOMEM);
}
h = mtod(sc->sc_mbuf, struct pfsync_header *);
} else {
h = mtod(sc->sc_mbuf, struct pfsync_header *);
if (h->action != action) {
pfsync_sendout(sc);
if ((sc->sc_mbuf = pfsync_get_mbuf(sc, action,
(void *)&sc->sc_statep.s)) == NULL) {
splx(s);
return (ENOMEM);
}
h = mtod(sc->sc_mbuf, struct pfsync_header *);
} else {
/*
* If it's an update, look in the packet to see if
* we already have an update for the state.
*/
if (action == PFSYNC_ACT_UPD && sc->sc_maxupdates) {
struct pfsync_state *usp =
(void *)((char *)h + PFSYNC_HDRLEN);
for (i = 0; i < h->count; i++) {
if (!memcmp(usp->id, &st->id,
PFSYNC_ID_LEN) &&
usp->creatorid == st->creatorid) {
sp = usp;
sp->updates++;
break;
}
usp++;
}
}
}
}
secs = time_second;
st->pfsync_time = time_uptime;
TAILQ_REMOVE(&state_updates, st, u.s.entry_updates);
TAILQ_INSERT_TAIL(&state_updates, st, u.s.entry_updates);
if (sp == NULL) {
/* not a "duplicate" update */
i = 255;
sp = sc->sc_statep.s++;
sc->sc_mbuf->m_pkthdr.len =
sc->sc_mbuf->m_len += sizeof(struct pfsync_state);
h->count++;
bzero(sp, sizeof(*sp));
bcopy(&st->id, sp->id, sizeof(sp->id));
sp->creatorid = st->creatorid;
strlcpy(sp->ifname, st->u.s.kif->pfik_name, sizeof(sp->ifname));
pf_state_host_hton(&st->lan, &sp->lan);
pf_state_host_hton(&st->gwy, &sp->gwy);
pf_state_host_hton(&st->ext, &sp->ext);
bcopy(&st->rt_addr, &sp->rt_addr, sizeof(sp->rt_addr));
sp->creation = htonl(secs - st->creation);
sp->packets[0] = htonl(st->packets[0]);
sp->packets[1] = htonl(st->packets[1]);
sp->bytes[0] = htonl(st->bytes[0]);
sp->bytes[1] = htonl(st->bytes[1]);
if ((r = st->rule.ptr) == NULL)
sp->rule = htonl(-1);
else
sp->rule = htonl(r->nr);
if ((r = st->anchor.ptr) == NULL)
sp->anchor = htonl(-1);
else
sp->anchor = htonl(r->nr);
sp->af = st->af;
sp->proto = st->proto;
sp->direction = st->direction;
sp->log = st->log;
sp->allow_opts = st->allow_opts;
sp->timeout = st->timeout;
if (flags & PFSYNC_FLAG_STALE)
sp->sync_flags |= PFSTATE_STALE;
}
pf_state_peer_hton(&st->src, &sp->src);
pf_state_peer_hton(&st->dst, &sp->dst);
if (st->expire <= secs)
sp->expire = htonl(0);
else
sp->expire = htonl(st->expire - secs);
/* do we need to build "compressed" actions for network transfer? */
if (sc->sc_sync_ifp && flags & PFSYNC_FLAG_COMPRESS) {
switch (action) {
case PFSYNC_ACT_UPD:
newaction = PFSYNC_ACT_UPD_C;
break;
case PFSYNC_ACT_DEL:
newaction = PFSYNC_ACT_DEL_C;
break;
default:
/* by default we just send the uncompressed states */
break;
}
}
if (newaction) {
if (sc->sc_mbuf_net == NULL) {
if ((sc->sc_mbuf_net = pfsync_get_mbuf(sc, newaction,
(void *)&sc->sc_statep_net.s)) == NULL) {
splx(s);
return (ENOMEM);
}
}
h_net = mtod(sc->sc_mbuf_net, struct pfsync_header *);
switch (newaction) {
case PFSYNC_ACT_UPD_C:
if (i != 255) {
up = (void *)((char *)h_net +
PFSYNC_HDRLEN + (i * sizeof(*up)));
up->updates++;
} else {
h_net->count++;
sc->sc_mbuf_net->m_pkthdr.len =
sc->sc_mbuf_net->m_len += sizeof(*up);
up = sc->sc_statep_net.u++;
bzero(up, sizeof(*up));
bcopy(&st->id, up->id, sizeof(up->id));
up->creatorid = st->creatorid;
}
up->timeout = st->timeout;
up->expire = sp->expire;
up->src = sp->src;
up->dst = sp->dst;
break;
case PFSYNC_ACT_DEL_C:
sc->sc_mbuf_net->m_pkthdr.len =
sc->sc_mbuf_net->m_len += sizeof(*dp);
dp = sc->sc_statep_net.d++;
h_net->count++;
bzero(dp, sizeof(*dp));
bcopy(&st->id, dp->id, sizeof(dp->id));
dp->creatorid = st->creatorid;
break;
}
}
if (h->count == sc->sc_maxcount ||
(sc->sc_maxupdates && (sp->updates >= sc->sc_maxupdates)))
ret = pfsync_sendout(sc);
splx(s);
return (ret);
}
/* This must be called in splnet() */
int
pfsync_request_update(struct pfsync_state_upd *up, struct in_addr *src)
{
#ifdef __FreeBSD__
struct ifnet *ifp = SCP2IFP(LIST_FIRST(&pfsync_list));
#else
struct ifnet *ifp = &pfsyncif.sc_if;
#endif
struct pfsync_header *h;
struct pfsync_softc *sc = ifp->if_softc;
struct pfsync_state_upd_req *rup;
int ret = 0;
#ifdef __FreeBSD__
PF_ASSERT(MA_OWNED);
#endif
if (sc->sc_mbuf == NULL) {
if ((sc->sc_mbuf = pfsync_get_mbuf(sc, PFSYNC_ACT_UREQ,
(void *)&sc->sc_statep.s)) == NULL)
return (ENOMEM);
h = mtod(sc->sc_mbuf, struct pfsync_header *);
} else {
h = mtod(sc->sc_mbuf, struct pfsync_header *);
if (h->action != PFSYNC_ACT_UREQ) {
pfsync_sendout(sc);
if ((sc->sc_mbuf = pfsync_get_mbuf(sc, PFSYNC_ACT_UREQ,
(void *)&sc->sc_statep.s)) == NULL)
return (ENOMEM);
h = mtod(sc->sc_mbuf, struct pfsync_header *);
}
}
if (src != NULL)
sc->sc_sendaddr = *src;
sc->sc_mbuf->m_pkthdr.len = sc->sc_mbuf->m_len += sizeof(*rup);
h->count++;
rup = sc->sc_statep.r++;
bzero(rup, sizeof(*rup));
if (up != NULL) {
bcopy(up->id, rup->id, sizeof(rup->id));
rup->creatorid = up->creatorid;
}
if (h->count == sc->sc_maxcount)
ret = pfsync_sendout(sc);
return (ret);
}
int
pfsync_clear_states(u_int32_t creatorid, char *ifname)
{
#ifdef __FreeBSD__
struct ifnet *ifp = SCP2IFP(LIST_FIRST(&pfsync_list));
#else
struct ifnet *ifp = &pfsyncif.sc_if;
#endif
struct pfsync_softc *sc = ifp->if_softc;
struct pfsync_state_clr *cp;
int s, ret;
s = splnet();
#ifdef __FreeBSD__
PF_ASSERT(MA_OWNED);
#endif
if (sc->sc_mbuf != NULL)
pfsync_sendout(sc);
if ((sc->sc_mbuf = pfsync_get_mbuf(sc, PFSYNC_ACT_CLR,
(void *)&sc->sc_statep.c)) == NULL) {
splx(s);
return (ENOMEM);
}
sc->sc_mbuf->m_pkthdr.len = sc->sc_mbuf->m_len += sizeof(*cp);
cp = sc->sc_statep.c;
cp->creatorid = creatorid;
if (ifname != NULL)
strlcpy(cp->ifname, ifname, IFNAMSIZ);
ret = (pfsync_sendout(sc));
splx(s);
return (ret);
}
void
pfsync_timeout(void *v)
{
struct pfsync_softc *sc = v;
int s;
s = splnet();
#ifdef __FreeBSD__
PF_LOCK();
#endif
pfsync_sendout(sc);
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
splx(s);
}
/* This must be called in splnet() */
void
pfsync_send_bus(struct pfsync_softc *sc, u_int8_t status)
{
struct pfsync_state_bus *bus;
#ifdef __FreeBSD__
PF_ASSERT(MA_OWNED);
#endif
if (sc->sc_mbuf != NULL)
pfsync_sendout(sc);
if (pfsync_sync_ok &&
(sc->sc_mbuf = pfsync_get_mbuf(sc, PFSYNC_ACT_BUS,
(void *)&sc->sc_statep.b)) != NULL) {
sc->sc_mbuf->m_pkthdr.len = sc->sc_mbuf->m_len += sizeof(*bus);
bus = sc->sc_statep.b;
bus->creatorid = pf_status.hostid;
bus->status = status;
bus->endtime = htonl(time_uptime - sc->sc_ureq_received);
pfsync_sendout(sc);
}
}
void
pfsync_bulk_update(void *v)
{
struct pfsync_softc *sc = v;
int s, i = 0;
struct pf_state *state;
#ifdef __FreeBSD__
PF_LOCK();
#endif
s = splnet();
if (sc->sc_mbuf != NULL)
pfsync_sendout(sc);
/*
* Grab at most PFSYNC_BULKPACKETS worth of states which have not
* been sent since the latest request was made.
*/
while ((state = TAILQ_FIRST(&state_updates)) != NULL &&
++i < (sc->sc_maxcount * PFSYNC_BULKPACKETS)) {
if (state->pfsync_time > sc->sc_ureq_received) {
/* we're done */
pfsync_send_bus(sc, PFSYNC_BUS_END);
sc->sc_ureq_received = 0;
#ifdef __FreeBSD__
callout_stop(&sc->sc_bulk_tmo);
#else
timeout_del(&sc->sc_bulk_tmo);
#endif
if (pf_status.debug >= PF_DEBUG_MISC)
printf("pfsync: bulk update complete\n");
break;
} else {
/* send an update and move to end of list */
if (!state->sync_flags)
pfsync_pack_state(PFSYNC_ACT_UPD, state, 0);
state->pfsync_time = time_uptime;
TAILQ_REMOVE(&state_updates, state, u.s.entry_updates);
TAILQ_INSERT_TAIL(&state_updates, state,
u.s.entry_updates);
/* look again for more in a bit */
#ifdef __FreeBSD__
callout_reset(&sc->sc_bulk_tmo, 1, pfsync_timeout,
LIST_FIRST(&pfsync_list));
#else
timeout_add(&sc->sc_bulk_tmo, 1);
#endif
}
}
if (sc->sc_mbuf != NULL)
pfsync_sendout(sc);
splx(s);
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
}
void
pfsync_bulkfail(void *v)
{
struct pfsync_softc *sc = v;
int s, error;
#ifdef __FreeBSD__
PF_LOCK();
#endif
if (sc->sc_bulk_tries++ < PFSYNC_MAX_BULKTRIES) {
/* Try again in a bit */
#ifdef __FreeBSD__
callout_reset(&sc->sc_bulkfail_tmo, 5 * hz, pfsync_bulkfail,
LIST_FIRST(&pfsync_list));
#else
timeout_add(&sc->sc_bulkfail_tmo, 5 * hz);
#endif
s = splnet();
error = pfsync_request_update(NULL, NULL);
if (error == ENOMEM) {
if (pf_status.debug >= PF_DEBUG_MISC)
printf("pfsync: cannot allocate mbufs for "
"bulk update\n");
} else
pfsync_sendout(sc);
splx(s);
} else {
/* Pretend like the transfer was ok */
sc->sc_ureq_sent = 0;
sc->sc_bulk_tries = 0;
#if NCARP > 0
if (!pfsync_sync_ok)
carp_suppress_preempt--;
#endif
pfsync_sync_ok = 1;
if (pf_status.debug >= PF_DEBUG_MISC)
printf("pfsync: failed to receive "
"bulk update status\n");
#ifdef __FreeBSD__
callout_stop(&sc->sc_bulkfail_tmo);
#else
timeout_del(&sc->sc_bulkfail_tmo);
#endif
}
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
}
/* This must be called in splnet() */
int
pfsync_sendout(sc)
struct pfsync_softc *sc;
{
#if NBPFILTER > 0
# ifdef __FreeBSD__
struct ifnet *ifp = SCP2IFP(sc);
# else
struct ifnet *ifp = &sc->if_sc;
# endif
#endif
struct mbuf *m;
#ifdef __FreeBSD__
PF_ASSERT(MA_OWNED);
callout_stop(&sc->sc_tmo);
#else
timeout_del(&sc->sc_tmo);
#endif
if (sc->sc_mbuf == NULL)
return (0);
m = sc->sc_mbuf;
sc->sc_mbuf = NULL;
sc->sc_statep.s = NULL;
#ifdef __FreeBSD__
KASSERT(m != NULL, ("pfsync_sendout: null mbuf"));
#endif
#if NBPFILTER > 0
#ifdef __FreeBSD__
BPF_MTAP(ifp, m);
#else
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m);
#endif
#endif
if (sc->sc_mbuf_net) {
m_freem(m);
m = sc->sc_mbuf_net;
sc->sc_mbuf_net = NULL;
sc->sc_statep_net.s = NULL;
}
#ifdef __FreeBSD__
if (sc->sc_sync_ifp ||
sc->sc_sync_peer.s_addr != htonl(INADDR_PFSYNC_GROUP)) {
#else
if (sc->sc_sync_ifp ||sc->sc_sync_peer.s_addr != INADDR_PFSYNC_GROUP) {
#endif
struct ip *ip;
struct sockaddr sa;
M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
if (m == NULL) {
pfsyncstats.pfsyncs_onomem++;
return (0);
}
ip = mtod(m, struct ip *);
ip->ip_v = IPVERSION;
ip->ip_hl = sizeof(*ip) >> 2;
ip->ip_tos = IPTOS_LOWDELAY;
#ifdef __FreeBSD__
ip->ip_len = m->m_pkthdr.len;
#else
ip->ip_len = htons(m->m_pkthdr.len);
#endif
ip->ip_id = htons(ip_randomid());
#ifdef __FreeBSD__
ip->ip_off = IP_DF;
#else
ip->ip_off = htons(IP_DF);
#endif
ip->ip_ttl = PFSYNC_DFLTTL;
ip->ip_p = IPPROTO_PFSYNC;
ip->ip_sum = 0;
bzero(&sa, sizeof(sa));
ip->ip_src.s_addr = INADDR_ANY;
#ifdef __FreeBSD__
if (sc->sc_sendaddr.s_addr == htonl(INADDR_PFSYNC_GROUP))
#else
if (sc->sc_sendaddr.s_addr == INADDR_PFSYNC_GROUP)
#endif
m->m_flags |= M_MCAST;
ip->ip_dst = sc->sc_sendaddr;
sc->sc_sendaddr.s_addr = sc->sc_sync_peer.s_addr;
pfsyncstats.pfsyncs_opackets++;
#ifdef __FreeBSD__
if (!IF_HANDOFF(&sc->sc_ifq, m, NULL))
pfsyncstats.pfsyncs_oerrors++;
callout_reset(&sc->sc_send_tmo, 1, pfsync_senddef, sc);
#else
if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL))
pfsyncstats.pfsyncs_oerrors++;
#endif
} else
m_freem(m);
return (0);
}
#ifdef __FreeBSD__
static void
pfsync_senddef(void *arg)
{
struct pfsync_softc *sc = (struct pfsync_softc *)arg;
struct mbuf *m;
for(;;) {
IF_DEQUEUE(&sc->sc_ifq, m);
if (m == NULL)
break;
if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL))
pfsyncstats.pfsyncs_oerrors++;
}
}
static int
pfsync_modevent(module_t mod, int type, void *data)
{
int error = 0;
switch (type) {
case MOD_LOAD:
LIST_INIT(&pfsync_list);
if_clone_attach(&pfsync_cloner);
break;
case MOD_UNLOAD:
if_clone_detach(&pfsync_cloner);
break;
default:
error = EINVAL;
break;
}
return error;
}
static moduledata_t pfsync_mod = {
"pfsync",
pfsync_modevent,
0
};
#define PFSYNC_MODVER 1
DECLARE_MODULE(pfsync, pfsync_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
MODULE_VERSION(pfsync, PFSYNC_MODVER);
#endif /* __FreeBSD__ */
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