ip_fw.h revision 5085 
118140Spst/*
218140Spst * Copyright (c) 1993 Daniel Boulet
318140Spst * Copyright (c) 1994 Ugen J.S.Antsilevich
418140Spst *
518140Spst * Redistribution and use in source forms, with and without modification,
618140Spst * are permitted provided that this entire comment appears intact.
718140Spst *
818140Spst * Redistribution in binary form may occur without any restrictions.
918140Spst * Obviously, it would be nice if you gave credit where credit is due
1018140Spst * but requiring it would be too onerous.
1118140Spst *
1218140Spst * This software is provided ``AS IS'' without any warranties of any kind.
1318140Spst */
1418140Spst
1518140Spst/*
1618140Spst * Format of an IP firewall descriptor
1718140Spst *
1818140Spst * src, dst, src_mask, dst_mask are always stored in network byte order.
1918140Spst * flags and num_*_ports are stored in host byte order (of course).
2018140Spst * Port numbers are stored in HOST byte order.
2118140Spst */
2218140Spst#ifndef _IP_FW_H
2318140Spst#define _IP_FW_H
2418140Spst
2518140Spststruct ip_fw {
2618140Spst    struct ip_fw *next;			/* Next firewall on chain */
2718140Spst    struct in_addr src, dst;		/* Source and destination IP addr */
2818140Spst    struct in_addr src_mask, dst_mask;	/* Mask for src and dest IP addr */
2918140Spst    struct in_addr via;			/* IP addr of interface "via" */
3018140Spst    u_short flags;			/* Flags word */
3118140Spst    u_short n_src_p, n_dst_p;           /* # of src ports and # of dst ports */
3218140Spst    					/* in ports array (dst ports follow */
3318140Spst    					/* src ports; max of 10 ports in all; */
3418140Spst    					/* count of 0 means match all ports) */
3518140Spst#define IP_FW_MAX_PORTS	10      	/* A reasonable maximum */
3618140Spst    u_short ports[IP_FW_MAX_PORTS];     /* Array of port numbers to match */
3718140Spst    u_long p_cnt,b_cnt;			/* Packet and byte counters */
3818140Spst};
3918140Spst
4018140Spst/*
4118140Spst * Values for "flags" field .
4218140Spst */
4318140Spst
4418140Spst#define IP_FW_F_ALL	0x000	/* This is a universal packet firewall*/
4518140Spst#define IP_FW_F_TCP	0x001	/* This is a TCP packet firewall      */
4618140Spst#define IP_FW_F_UDP	0x002	/* This is a UDP packet firewall      */
4718140Spst#define IP_FW_F_ICMP	0x003	/* This is a ICMP packet firewall     */
4818140Spst#define IP_FW_F_KIND	0x003	/* Mask to isolate firewall kind      */
49#define IP_FW_F_ACCEPT	0x004	/* This is an accept firewall (as     *
50				 *         opposed to a deny firewall)*
51				 *                                    */
52#define IP_FW_F_SRNG	0x008	/* The first two src ports are a min  *
53				 * and max range (stored in host byte *
54				 * order).                            *
55				 *                                    */
56#define IP_FW_F_DRNG	0x010	/* The first two dst ports are a min  *
57				 * and max range (stored in host byte *
58				 * order).                            *
59				 * (ports[0] <= port <= ports[1])     *
60				 *                                    */
61#define IP_FW_F_PRN	0x020	/* In verbose mode print this firewall*/
62#define IP_FW_F_BIDIR	0x040	/* For accounting-count two way       */
63#define IP_FW_F_TCPSYN	0x080	/* For tcp packets-check SYN only     */
64#define IP_FW_F_ICMPRPL	0x100	/* Send back icmp unreachable packet  */
65#define IP_FW_F_MASK	0x1FF	/* All possible flag bits mask        */
66
67/*
68 * New IP firewall options for [gs]etsockopt at the RAW IP level.
69 */
70#define IP_FW_BASE_CTL	53
71
72#define IP_FW_ADD_BLK (IP_FW_BASE_CTL)
73#define IP_FW_ADD_FWD (IP_FW_BASE_CTL+1)
74#define IP_FW_DEL_BLK (IP_FW_BASE_CTL+4)
75#define IP_FW_DEL_FWD (IP_FW_BASE_CTL+5)
76#define IP_FW_FLUSH   (IP_FW_BASE_CTL+6)
77#define IP_FW_POLICY  (IP_FW_BASE_CTL+7)
78
79#define IP_ACCT_ADD   (IP_FW_BASE_CTL+10)
80#define IP_ACCT_DEL   (IP_FW_BASE_CTL+11)
81#define IP_ACCT_FLUSH (IP_FW_BASE_CTL+12)
82#define IP_ACCT_ZERO  (IP_FW_BASE_CTL+13)
83
84/*
85 * Policy flags...
86 */
87#define IP_FW_P_DENY		0x01
88#define IP_FW_P_ICMP		0x02
89#define IP_FW_P_MASK		0x03
90
91
92/*
93 * Main firewall chains definitions and global var's definitions.
94 */
95#ifdef KERNEL
96#ifdef IPFIREWALL
97extern struct ip_fw *ip_fw_blk_chain;
98extern struct ip_fw *ip_fw_fwd_chain;
99extern u_short ip_fw_policy;
100#endif
101#ifdef IPACCT
102extern struct ip_fw *ip_acct_chain;
103#endif
104#endif /* KERNEL */
105
106#endif /* _IP_FW_H */
107