path: root/sys/net/pfvar.h

/*	$OpenBSD: pfvar.h,v 1.61 2002/01/11 20:13:11 mickey Exp $ */

/*
 * Copyright (c) 2001 Daniel Hartmeier
 * 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.
 *
 */

#ifndef _NET_PFVAR_H_
#define _NET_PFVAR_H_

#include <sys/types.h>
#include <sys/queue.h>

enum	{ PF_IN=0, PF_OUT=1 };
enum	{ PF_PASS=0, PF_DROP=1, PF_SCRUB=2 };
enum	{ PF_OP_IRG=1, PF_OP_EQ=2, PF_OP_NE=3, PF_OP_LT=4,
	  PF_OP_LE=5, PF_OP_GT=6, PF_OP_GE=7, PF_OP_XRG=8 };
enum	{ PF_DEBUG_NONE=0, PF_DEBUG_URGENT=1, PF_DEBUG_MISC=2 };
enum	{ PF_CHANGE_ADD_HEAD=1, PF_CHANGE_ADD_TAIL=2,
	  PF_CHANGE_ADD_BEFORE=3, PF_CHANGE_ADD_AFTER=4,
	  PF_CHANGE_REMOVE=5 };
enum	{ PFTM_TCP_FIRST_PACKET=0, PFTM_TCP_OPENING=1, PFTM_TCP_ESTABLISHED=2,
	  PFTM_TCP_CLOSING=3, PFTM_TCP_FIN_WAIT=4, PFTM_TCP_CLOSED=5,
	  PFTM_UDP_FIRST_PACKET=6, PFTM_UDP_SINGLE=7, PFTM_UDP_MULTIPLE=8,
	  PFTM_ICMP_FIRST_PACKET=9, PFTM_ICMP_ERROR_REPLY=10,
	  PFTM_OTHER_FIRST_PACKET=11, PFTM_OTHER_SINGLE=12,
	  PFTM_OTHER_MULTIPLE=13, PFTM_FRAG=14, PFTM_INTERVAL=15, PFTM_MAX=16 };
enum	{ PF_FASTROUTE=1, PF_ROUTETO=2, PF_DUPTO=3 };

struct pf_addr {
	union {
		struct in_addr 		v4;
		struct in6_addr 	v6;
		u_int8_t		addr8[16];
		u_int16_t		addr16[8];
		u_int32_t		addr32[4];
	} pfa;		    /* 128-bit address */
#define v4	pfa.v4
#define v6	pfa.v6
#define addr8	pfa.addr8
#define addr16	pfa.addr16
#define addr32	pfa.addr32
};

/*
 * Address manipulation macros
 */

#ifdef _KERNEL

#ifdef INET
#ifndef INET6
#define PF_INET_ONLY
#endif /* ! INET6 */
#endif /* INET */

#ifdef INET6
#ifndef INET
#define PF_INET6_ONLY
#endif /* ! INET */
#endif /* INET6 */

#ifdef INET
#ifdef INET6
#define PF_INET_INET6
#endif /* INET6 */
#endif /* INET */

#else

#define PF_INET_INET6

#endif /* _KERNEL */

/* Both IPv4 and IPv6 */
#ifdef PF_INET_INET6

#define PF_AEQ(a, b, c) \
	((c == AF_INET && (a)->addr32[0] == (b)->addr32[0]) || \
	(c == AF_INET6 && (a)->addr32[0] == (b)->addr32[0] && \
	(a)->addr32[1] == (b)->addr32[1] && \
	(a)->addr32[2] == (b)->addr32[2] && \
	(a)->addr32[3] == (b)->addr32[3])) \

#define PF_ANEQ(a, b, c) \
	((c == AF_INET && (a)->addr32[0] != (b)->addr32[0]) || \
	(c == AF_INET6 && ((a)->addr32[0] != (b)->addr32[0] || \
	(a)->addr32[1] != (b)->addr32[1] || \
	(a)->addr32[2] != (b)->addr32[2] || \
	(a)->addr32[3] != (b)->addr32[3]))) \

#define PF_AZERO(a, c) \
	((c == AF_INET && !(a)->addr32[0]) || \
	(c == AF_INET6 && !(a)->addr32[0] && \
	!(a)->addr32[1] && !(a)->addr32[2] && \
	!(a)->addr32[3] )) \

#define PF_MATCHA(n, a, m, b, f) \
	pf_match_addr(n, a, m, b, f)

#define PF_ACPY(a, b, f) \
	pf_addrcpy(a, b, f)

#else

/* Just IPv6 */
#ifdef PF_INET6_ONLY

#define PF_AEQ(a, b, c) \
	((a)->addr32[0] == (b)->addr32[0] && \
	(a)->addr32[1] == (b)->addr32[1] && \
	(a)->addr32[2] == (b)->addr32[2] && \
	(a)->addr32[3] == (b)->addr32[3]) \

#define PF_ANEQ(a, b, c) \
	((a)->addr32[0] != (b)->addr32[0] || \
	(a)->addr32[1] != (b)->addr32[1] || \
	(a)->addr32[2] != (b)->addr32[2] || \
	(a)->addr32[3] != (b)->addr32[3]) \

#define PF_AZERO(a, c) \
	(!(a)->addr32[0] && \
	!(a)->addr32[1] && \
	!(a)->addr32[2] && \
	!(a)->addr32[3] ) \

#define PF_MATCHA(n, a, m, b, f) \
	pf_match_addr(n, a, m, b, f)

#define PF_ACPY(a, b, f) \
	pf_addrcpy(a, b, f)

#else

/* Just IPv4 */
#ifdef PF_INET_ONLY

#define PF_AEQ(a, b, c) \
	((a)->addr32[0] == (b)->addr32[0])

#define PF_ANEQ(a, b, c) \
	((a)->addr32[0] != (b)->addr32[0])

#define PF_AZERO(a, c) \
	(!(a)->addr32[0])

#define PF_MATCHA(n, a, m, b, f) \
	pf_match_addr(n, a, m, b, f)

#define PF_ACPY(a, b, f) \
	(a)->v4.s_addr = (b)->v4.s_addr


#endif /* PF_INET_ONLY */
#endif /* PF_INET6_ONLY */
#endif /* PF_INET_INET6 */

struct pf_rule_addr {
	struct pf_addr	addr;
	struct pf_addr	mask;
	u_int16_t	port[2];
	u_int8_t	not;
	u_int8_t	port_op;
};

struct pf_rule {
	char		 ifname[IFNAMSIZ];
	char		 rt_ifname[IFNAMSIZ];
#define PF_RULE_LABEL_SIZE	32
	char		 label[PF_RULE_LABEL_SIZE];
	struct ifnet	*ifp;
	struct ifnet	*rt_ifp;
	struct pf_rule_addr src;
	struct pf_rule_addr dst;
	struct pf_addr	 rt_addr;

#define PF_SKIP_IFP		0
#define PF_SKIP_AF		1
#define PF_SKIP_PROTO		2
#define PF_SKIP_SRC_ADDR	3
#define PF_SKIP_SRC_PORT	4
#define PF_SKIP_DST_ADDR	5
#define PF_SKIP_DST_PORT	6
#define PF_SKIP_COUNT		7
	struct pf_rule	*skip[PF_SKIP_COUNT];
	TAILQ_ENTRY(pf_rule)	entries;

	u_int64_t	 evaluations;
	u_int64_t	 packets;
	u_int64_t	 bytes;

	u_int16_t	 nr;
	u_int16_t	 return_icmp;

	u_int8_t	 action;
	u_int8_t	 direction;
	u_int8_t	 log;
	u_int8_t	 quick;

#define PF_STATE_NORMAL		0x1
#define PF_STATE_MODULATE	0x2
	u_int8_t	 keep_state;
	u_int8_t	 af;
	u_int8_t	 proto;
	u_int8_t	 type;
	u_int8_t	 code;

	u_int8_t	 flags;
	u_int8_t	 flagset;

	u_int8_t	 rule_flag;
	u_int8_t	 min_ttl;	/* minimum ttl for packet normalize */
	u_int8_t	 allow_opts;
	u_int8_t	 rt;
};

#define	PFRULE_RETURNRST	0x01
#define	PFRULE_NODF		0x02

struct pf_state_host {
	struct pf_addr	addr;
	u_int16_t	port;
	u_int16_t	pad;
};

struct pf_state_peer {
	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;
	u_int8_t	state;
	u_int8_t	pad;
};

struct pf_state {
	TAILQ_ENTRY(pf_state)	entries;
	struct pf_state_host lan;
	struct pf_state_host gwy;
	struct pf_state_host ext;
	struct pf_state_peer src;
	struct pf_state_peer dst;
	struct pf_rule	*rule;
	u_int32_t	 creation;
	u_int32_t	 expire;
	u_int32_t	 packets;
	u_int32_t	 bytes;
	u_int8_t	 af;
	u_int8_t	 proto;
	u_int8_t	 direction;
	u_int8_t	 log;
	u_int8_t	 allow_opts;
};

#define		MATCH_TUPLE(h,r,d,i,a) \
		( \
		  (r->direction == d) && \
		  (r->ifp == NULL || r->ifp == i) && \
		  (!r->proto || r->proto == h->ip_p) && \
		  (!r->src.mask.addr32[0] || \
		   pf_match_addr(r->src.not, &(r)->src.addr, \
		   &(r)->src.mask, (struct pf_addr *)&h->ip_src.s_addr, a)) && \
		  (!r->dst.mask.addr32[0] || \
		   pf_match_addr(r->dst.not, &(r)->dst.addr, \
		   &(r)->dst.mask, (struct pf_addr *)&h->ip_dst.s_addr, a)) \
		)

struct pf_nat {
	char		 ifname[IFNAMSIZ];
	struct ifnet	*ifp;
	TAILQ_ENTRY(pf_nat)	entries;
	struct pf_addr	 saddr;
	struct pf_addr	 smask;
	struct pf_addr	 daddr;
	struct pf_addr	 dmask;
	struct pf_addr	 raddr;
	u_int8_t	 af;
	u_int8_t	 proto;
	u_int8_t	 snot;
	u_int8_t	 dnot;
	u_int8_t	 ifnot;
	u_int8_t	 no;
};

struct pf_binat {
	char		 ifname[IFNAMSIZ];
	struct ifnet	*ifp;
	TAILQ_ENTRY(pf_binat)	entries;
	struct pf_addr	 saddr;
	struct pf_addr	 daddr;
	struct pf_addr	 dmask;
	struct pf_addr	 raddr;
	u_int8_t	 af;
	u_int8_t	 proto;
	u_int8_t	 dnot;
	u_int8_t	 no;
};

struct pf_rdr {
	char		 ifname[IFNAMSIZ];
	struct ifnet	*ifp;
	TAILQ_ENTRY(pf_rdr)	entries;
	struct pf_addr	 saddr;
	struct pf_addr	 smask;
	struct pf_addr	 daddr;
	struct pf_addr	 dmask;
	struct pf_addr	 raddr;
	u_int16_t	 dport;
	u_int16_t	 dport2;
	u_int16_t	 rport;
	u_int8_t	 af;
	u_int8_t	 proto;
	u_int8_t	 snot;
	u_int8_t	 dnot;
	u_int8_t	 ifnot;
	u_int8_t	 opts;
	u_int8_t	 no;
};

struct pf_tree_key {
	struct pf_addr	 addr[2];
	u_int16_t	 port[2];
	u_int8_t	 proto;
	u_int8_t	 af;
};

TAILQ_HEAD(pf_rulequeue, pf_rule);

struct pf_pdesc {
	struct pf_addr	*src;
	struct pf_addr	*dst;
	u_int16_t	*ip_sum;
	u_int64_t	 tot_len; 	/* Make Mickey money */
	u_int32_t	 p_len; 	/* total length of payload */

	u_int16_t	 flags;		/* Let SCRUB trigger behavior in
					 * state code. Easier than tags */
	u_int8_t	 af;
	u_int8_t	 proto;
	union {
		struct tcphdr		*tcp;
		struct udphdr		*udp;
		struct icmp		*icmp;
#ifdef INET6
		struct icmp6_hdr	*icmp6;
#endif /* INET6 */
		void			*any;
	} hdr;
};

/* flags for RDR options */
#define PF_DPORT_RANGE	0x01		/* Dest port uses range */
#define PF_RPORT_RANGE	0x02		/* RDR'ed port uses range */

/* Reasons code for passing/dropping a packet */
#define PFRES_MATCH	0		/* Explicit match of a rule */
#define PFRES_BADOFF	1		/* Bad offset for pull_hdr */
#define PFRES_FRAG	2		/* Dropping following fragment */
#define PFRES_SHORT	3		/* Dropping short packet */
#define PFRES_NORM	4		/* Dropping by normalizer */
#define PFRES_MEMORY	5		/* Dropped due to lacking mem */
#define PFRES_MAX	6		/* total+1 */

#define PFRES_NAMES { \
	"match", \
	"bad-offset", \
	"fragment", \
	"short", \
	"normalize", \
	"memory", \
	NULL \
}

#define FCNT_STATE_SEARCH	0
#define FCNT_STATE_INSERT	1
#define FCNT_STATE_REMOVALS	2
#define FCNT_MAX		3

#define FCNT_NAMES { \
	"state searches", \
	"state inserts", \
	"state removals", \
	NULL \
}

#define ACTION_SET(a, x) \
	do { \
		if ((a) != NULL) \
			*(a) = (x); \
	} while (0)

#define REASON_SET(a, x) \
	do { \
		if ((a) != NULL) \
			*(a) = (x); \
		if (x < PFRES_MAX) \
			pf_status.counters[x]++; \
	} while (0)

struct pf_status {
	u_int64_t	counters[PFRES_MAX];
	u_int64_t	fcounters[FCNT_MAX];
	u_int64_t	pcounters[2][2][3];
	u_int64_t	bcounters[2][2];
	u_int32_t	running;
	u_int32_t	states;
	u_int32_t	since;
	u_int32_t	debug;
};

/*
 * ioctl parameter structures
 */

struct pfioc_rule {
	u_int32_t	 ticket;
	u_int32_t	 nr;
	struct pf_rule	 rule;
};

struct pfioc_changerule {
	u_int32_t	 action;
	struct pf_rule	 oldrule;
	struct pf_rule	 newrule;
};

struct pfioc_nat {
	u_int32_t	 ticket;
	u_int32_t	 nr;
	struct pf_nat	 nat;
};

struct pfioc_changenat {
	u_int32_t	 action;
	struct pf_nat	 oldnat;
	struct pf_nat	 newnat;
};

struct pfioc_natlook {
	struct pf_addr	 saddr;
	struct pf_addr	 daddr;
	struct pf_addr	 rsaddr;
	struct pf_addr	 rdaddr;
	u_int16_t	 sport;
	u_int16_t	 dport;
	u_int16_t	 rsport;
	u_int16_t	 rdport;
	u_int8_t	 af;
	u_int8_t	 proto;
	u_int8_t	 direction;
};

struct pfioc_binat {
	u_int32_t	 ticket;
	u_int32_t	 nr;
	struct pf_binat	 binat;
};

struct pfioc_changebinat {
	u_int32_t	action;
	struct pf_binat	oldbinat;
	struct pf_binat	newbinat;
};

struct pfioc_rdr {
	u_int32_t	 ticket;
	u_int32_t	 nr;
	struct pf_rdr	 rdr;
};

struct pfioc_changerdr {
	u_int32_t	 action;
	struct pf_rdr	 oldrdr;
	struct pf_rdr	 newrdr;
};

struct pfioc_state {
	u_int32_t	 nr;
	struct pf_state	 state;
};

struct pfioc_states {
	int	ps_len;
	union {
		caddr_t psu_buf;
		struct pf_state *psu_states;
	} ps_u;
#define ps_buf		ps_u.psu_buf
#define ps_states	ps_u.psu_states
};

struct pfioc_if {
	char		 ifname[IFNAMSIZ];
};

struct pfioc_tm {
	int		 timeout;
	int		 seconds;
};

/*
 * ioctl operations
 */

#define DIOCSTART	_IO  ('D',  1)
#define DIOCSTOP	_IO  ('D',  2)
#define DIOCBEGINRULES	_IOWR('D',  3, u_int32_t)
#define DIOCADDRULE	_IOWR('D',  4, struct pfioc_rule) 
#define DIOCCOMMITRULES	_IOWR('D',  5, u_int32_t)
#define DIOCGETRULES	_IOWR('D',  6, struct pfioc_rule)
#define DIOCGETRULE	_IOWR('D',  7, struct pfioc_rule) 
#define DIOCBEGINNATS	_IOWR('D',  8, u_int32_t)
#define DIOCADDNAT	_IOWR('D',  9, struct pfioc_nat) 
#define DIOCCOMMITNATS	_IOWR('D', 10, u_int32_t)
#define DIOCGETNATS	_IOWR('D', 11, struct pfioc_nat)
#define DIOCGETNAT	_IOWR('D', 12, struct pfioc_nat) 
#define DIOCBEGINRDRS	_IOWR('D', 13, u_int32_t)
#define DIOCADDRDR	_IOWR('D', 14, struct pfioc_rdr) 
#define DIOCCOMMITRDRS	_IOWR('D', 15, u_int32_t)
#define DIOCGETRDRS	_IOWR('D', 16, struct pfioc_rdr)
#define DIOCGETRDR	_IOWR('D', 17, struct pfioc_rdr) 
#define DIOCCLRSTATES	_IO  ('D', 18)
#define DIOCGETSTATE	_IOWR('D', 19, struct pfioc_state)
#define DIOCSETSTATUSIF _IOWR('D', 20, struct pfioc_if)
#define DIOCGETSTATUS	_IOWR('D', 21, struct pf_status)
#define DIOCCLRSTATUS	_IO  ('D', 22)
#define DIOCNATLOOK	_IOWR('D', 23, struct pfioc_natlook)
#define DIOCSETDEBUG	_IOWR('D', 24, u_int32_t)
#define DIOCGETSTATES	_IOWR('D', 25, struct pfioc_states)
#define DIOCCHANGERULE	_IOWR('D', 26, struct pfioc_changerule)
#define DIOCCHANGENAT	_IOWR('D', 27, struct pfioc_changenat)
#define DIOCCHANGERDR	_IOWR('D', 28, struct pfioc_changerdr)
#define DIOCSETTIMEOUT	_IOWR('D', 29, struct pfioc_tm)
#define DIOCGETTIMEOUT	_IOWR('D', 30, struct pfioc_tm)
#define DIOCBEGINBINATS	_IOWR('D', 31, u_int32_t)
#define DIOCADDBINAT	_IOWR('D', 32, struct pfioc_binat)
#define DIOCCOMMITBINATS _IOWR('D', 33, u_int32_t)
#define DIOCGETBINATS	_IOWR('D', 34, struct pfioc_binat)
#define DIOCGETBINAT	_IOWR('D', 35, struct pfioc_binat)
#define DIOCCHANGEBINAT	_IOWR('D', 36, struct pfioc_changebinat)
#define DIOCADDSTATE	_IOWR('D', 37, struct pfioc_state)
#define DIOCCLRRULECTRS	_IO  ('D', 38)

#ifdef _KERNEL

#ifdef INET
int	pf_test(int, struct ifnet *, struct mbuf **);
#endif /* INET */

#ifdef INET6
int	pf_test6(int, struct ifnet *, struct mbuf **);
#endif /* INET */

struct pf_tree_node;
struct pf_state
	*pf_find_state(struct pf_tree_node *, struct pf_tree_key *);
int	pf_tree_insert(struct pf_tree_node **, struct pf_tree_node *,
	    struct pf_tree_key *, struct pf_state *);
int	pf_tree_remove(struct pf_tree_node **, struct pf_tree_node *,
	    struct pf_tree_key *);

int	pflog_packet(struct ifnet *, struct mbuf *, int, u_short, u_short,
	    struct pf_rule *);
int	pf_match_addr(u_int8_t, struct pf_addr *, struct pf_addr *,
	    struct pf_addr *, int);
int	pf_match_port(u_int8_t, u_int16_t, u_int16_t, u_int16_t);

void	pf_normalize_init(void);
int	pf_normalize_ip(struct mbuf **, int, struct ifnet *, u_short *);
void	pf_purge_expired_fragments(void);

extern struct pf_rulequeue *pf_rules_active;
extern struct pf_status pf_status;
#endif /* _KERNEL */

#endif /* _NET_PFVAR_H_ */