/*	$OpenBSD: pfvar.h,v 1.36 2001/07/19 00:07:36 krw 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 };

struct pf_rule_addr {
	u_int32_t	addr;
	u_int32_t	mask;
	u_int16_t	port[2];
	u_int8_t	not;
	u_int8_t	port_op;
};

struct pf_rule {
	char		 ifname[IFNAMSIZ];
	struct ifnet	*ifp;
	struct pf_rule_addr src;
	struct pf_rule_addr dst;
	TAILQ_ENTRY(pf_rule)	entries;

	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;

	u_int8_t	 keep_state;
	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 */
};

#define	PFRULE_RETURNRST	0x01
#define	PFRULE_NODF		0x02

struct pf_state_host {
	u_int32_t	addr;
	u_int16_t	port;
};

struct pf_state_peer {
	u_int32_t	seqlo;		/* Max sequence number sent 	*/
	u_int32_t	seqhi;		/* Max the other end ACKd + win	*/
	u_int16_t	max_win;
	u_int8_t	state;
};

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	 proto;
	u_int8_t	 direction;
	u_int8_t	 log;
};

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

struct pf_natlook {
	u_int32_t	saddr;
	u_int32_t	daddr;
	u_int32_t	rsaddr;
	u_int32_t	rdaddr;
	u_int16_t	sport;
	u_int16_t	dport;
	u_int16_t	rsport;
	u_int16_t	rdport;
	u_int8_t	proto;
	u_int8_t	direction;
};
	

struct pf_nat {
	char		 ifname[IFNAMSIZ];
	struct ifnet	*ifp;
	TAILQ_ENTRY(pf_nat)	entries;
	u_int32_t	 saddr;
	u_int32_t	 smask;
	u_int32_t	 daddr;
	u_int32_t	 dmask;
	u_int32_t	 raddr;
	u_int8_t	 proto;
	u_int8_t	 snot;
	u_int8_t	 dnot;
	u_int8_t	 ifnot;
};

struct pf_rdr {
	char		 ifname[IFNAMSIZ];
	struct ifnet	*ifp;
	TAILQ_ENTRY(pf_rdr)	entries;
	u_int32_t	 saddr;
	u_int32_t	 smask;
	u_int32_t	 daddr;
	u_int32_t	 dmask;
	u_int32_t	 raddr;
	u_int16_t	 dport;
	u_int16_t	 dport2;
	u_int16_t	 rport;
	u_int8_t	 proto;
	u_int8_t	 snot;
	u_int8_t	 dnot;
	u_int8_t	 ifnot;
	u_int8_t	 opts;
};

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

TAILQ_HEAD(pf_rulequeue, pf_rule);

/* 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][3];
	u_int64_t	bcounters[2];
	u_int32_t	running;
	u_int32_t	states;
	u_int32_t	since;
};

/*
 * ioctl parameter structures
 */

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

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

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

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

struct pfioc_if {
	char		 ifname[IFNAMSIZ];
};

/*
 * 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 pf_natlook)

#ifdef _KERNEL

int	pf_test(int, struct ifnet *, struct mbuf **);

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 mbuf *, int, u_short, u_short, struct pf_rule *);
int	pf_match_addr(u_int8_t, u_int32_t, u_int32_t, u_int32_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;
extern int pf_debug;
#endif /* _KERNEL */

#endif /* _NET_PFVAR_H_ */