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/* $OpenBSD: if_pfsync.h,v 1.7 2003/12/28 17:18:58 mcbride Exp $ */
/*
* Copyright (c) 2001 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.
*/
#ifndef _NET_IF_PFSYNC_H_
#define _NET_IF_PFSYNC_H_
struct pfsync_state_scrub {
u_int16_t pfss_flags;
u_int8_t pfss_ttl; /* stashed TTL */
u_int8_t scrub_flag;
u_int32_t pfss_ts_mod; /* timestamp modulation */
} __packed;
struct pfsync_state_host {
struct pf_addr addr;
u_int16_t port;
u_int16_t pad[3];
} __packed;
struct pfsync_state_peer {
struct pfsync_state_scrub scrub; /* state is scrubbed */
u_int32_t seqlo; /* Max sequence number sent */
u_int32_t seqhi; /* Max the other end ACKd + win */
u_int32_t seqdiff; /* Sequence number modulator */
u_int16_t max_win; /* largest window (pre scaling) */
u_int16_t mss; /* Maximum segment size option */
u_int8_t state; /* active state level */
u_int8_t wscale; /* window scaling factor */
u_int8_t scrub_flag;
u_int8_t pad[5];
} __packed;
struct pfsync_state {
u_int64_t id;
struct pfsync_state_host lan;
struct pfsync_state_host gwy;
struct pfsync_state_host ext;
struct pfsync_state_peer src;
struct pfsync_state_peer dst;
struct pf_addr rt_addr;
u_int32_t rule;
u_int32_t anchor;
u_int32_t nat_rule;
u_int32_t creation;
u_int32_t expire;
u_int32_t packets[2];
u_int32_t bytes[2];
u_int32_t creatorid;
sa_family_t af;
u_int8_t proto;
u_int8_t direction;
u_int8_t log;
u_int8_t allow_opts;
u_int8_t timeout;
u_int8_t sync_flags;
u_int8_t updates;
} __packed;
struct pfsync_state_upd {
u_int64_t id;
struct pfsync_state_peer src;
struct pfsync_state_peer dst;
u_int32_t creatorid;
u_int32_t expire;
u_int8_t updates;
u_int8_t pad[7];
} __packed;
struct pfsync_state_del {
u_int64_t id;
u_int32_t creatorid;
struct {
u_int8_t state;
} src;
struct {
u_int8_t state;
} dst;
u_int8_t pad[2];
} __packed;
struct pfsync_state_upd_req {
u_int64_t id;
u_int32_t creatorid;
u_int32_t pad;
} __packed;
struct pfsync_state_clr {
u_int32_t creatorid;
u_int32_t pad;
} __packed;
#ifdef _KERNEL
union sc_statep {
struct pfsync_state *s;
struct pfsync_state_upd *u;
struct pfsync_state_del *d;
struct pfsync_state_clr *c;
struct pfsync_state_upd_req *r;
};
struct pfsync_softc {
struct ifnet sc_if;
struct ifnet *sc_sync_ifp;
struct ip_moptions sc_imo;
struct timeout sc_tmo;
struct in_addr sc_sendaddr;
struct mbuf *sc_mbuf; /* current cummulative mbuf */
struct mbuf *sc_mbuf_net; /* current cummulative mbuf */
union sc_statep sc_statep;
union sc_statep sc_statep_net;
int sc_maxcount; /* number of states in mtu */
int sc_maxupdates; /* number of updates/state */
};
#endif
struct pfsync_header {
u_int8_t version;
#define PFSYNC_VERSION 1
u_int8_t af;
u_int8_t action;
#define PFSYNC_ACT_CLR 0 /* clear all states */
#define PFSYNC_ACT_INS 1 /* insert state */
#define PFSYNC_ACT_UPD 2 /* update state */
#define PFSYNC_ACT_DEL 3 /* delete state */
#define PFSYNC_ACT_UPD_C 4 /* "compressed" state update */
#define PFSYNC_ACT_DEL_C 5 /* "compressed" state delete */
#define PFSYNC_ACT_INS_F 6 /* insert fragment */
#define PFSYNC_ACT_DEL_F 7 /* delete fragments */
#define PFSYNC_ACT_UREQ 8 /* request "uncompressed" state */
#define PFSYNC_ACT_MAX 9
u_int8_t count;
} __packed;
#define PFSYNC_HDRLEN sizeof(struct pfsync_header)
#define PFSYNC_ACTIONS \
"CLR ST", "INS ST", "UPD ST", "DEL ST", \
"UPD ST COMP", "DEL ST COMP", "INS FR", "DEL FR", "UPD REQ"
#define PFSYNC_DFLTTL 255
struct pfsyncstats {
u_long pfsyncs_ipackets; /* total input packets, IPv4 */
u_long pfsyncs_ipackets6; /* total input packets, IPv6 */
u_long pfsyncs_badif; /* not the right interface */
u_long pfsyncs_badttl; /* TTL is not PFSYNC_DFLTTL */
u_long pfsyncs_hdrops; /* packets shorter than header */
u_long pfsyncs_badver; /* bad (incl unsupp) version */
u_long pfsyncs_badact; /* bad action */
u_long pfsyncs_badlen; /* data length does not match */
u_long pfsyncs_badauth; /* bad authentication */
u_long pfsyncs_badstate; /* insert/lookup failed */
u_long pfsyncs_opackets; /* total output packets, IPv4 */
u_long pfsyncs_opackets6; /* total output packets, IPv6 */
u_long pfsyncs_onomem; /* no memory for an mbuf for a send */
u_long pfsyncs_oerrors; /* ip output error */
};
/*
* Configuration structure for SIOCSETPFSYNC SIOCGETPFSYNC
*/
struct pfsyncreq {
char pfsyncr_syncif[IFNAMSIZ];
int pfsyncr_maxupdates;
int pfsyncr_authlevel;
};
#define SIOCSETPFSYNC _IOW('i', 247, struct ifreq)
#define SIOCGETPFSYNC _IOWR('i', 248, struct ifreq)
#define pf_state_peer_hton(s,d) do { \
(d)->seqlo = htonl((s)->seqlo); \
(d)->seqhi = htonl((s)->seqhi); \
(d)->seqdiff = htonl((s)->seqdiff); \
(d)->max_win = htons((s)->max_win); \
(d)->mss = htons((s)->mss); \
(d)->state = (s)->state; \
(d)->wscale = (s)->wscale; \
} while (0)
#define pf_state_peer_ntoh(s,d) do { \
(d)->seqlo = ntohl((s)->seqlo); \
(d)->seqhi = ntohl((s)->seqhi); \
(d)->seqdiff = ntohl((s)->seqdiff); \
(d)->max_win = ntohs((s)->max_win); \
(d)->mss = ntohs((s)->mss); \
(d)->state = (s)->state; \
(d)->wscale = (s)->wscale; \
} while (0)
#define pf_state_host_hton(s,d) do { \
bcopy(&(s)->addr, &(d)->addr, sizeof((d)->addr)); \
(d)->port = htons((s)->port); \
} while (0)
#define pf_state_host_ntoh(s,d) do { \
bcopy(&(s)->addr, &(d)->addr, sizeof((d)->addr)); \
(d)->port = ntohs((s)->port); \
} while (0)
#ifdef _KERNEL
void pfsync_input(struct mbuf *, ...);
int pfsync_clear_states(u_int32_t);
int pfsync_pack_state(u_int8_t, struct pf_state *, int);
#define pfsync_insert_state(st) do { \
if (st->rule.ptr->rule_flag & PFRULE_NOSYNC) \
st->sync_flags |= PFSTATE_NOSYNC; \
else if (!st->sync_flags) \
pfsync_pack_state(PFSYNC_ACT_INS, (st), 1); \
st->sync_flags &= ~PFSTATE_FROMSYNC; \
} while (0)
#define pfsync_update_state(st) do { \
if (!st->sync_flags) \
pfsync_pack_state(PFSYNC_ACT_UPD, (st), 1); \
st->sync_flags &= ~PFSTATE_FROMSYNC; \
} while (0)
#define pfsync_delete_state(st) do { \
if (!st->sync_flags) \
pfsync_pack_state(PFSYNC_ACT_DEL, (st), 1); \
st->sync_flags &= ~PFSTATE_FROMSYNC; \
} while (0)
#endif
#endif /* _NET_IF_PFSYNC_H_ */
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