ip_fw.h revision 4849 
1/*
2 * Copyright (c) 1993 Daniel Boulet
3 * Copyright (c) 1994 Ugen J.S.Antsilevich
4 *
5 * Redistribution and use in source forms, with and without modification,
6 * are permitted provided that this entire comment appears intact.
7 *
8 * Redistribution in binary form may occur without any restrictions.
9 * Obviously, it would be nice if you gave credit where credit is due
10 * but requiring it would be too onerous.
11 *
12 * This software is provided ``AS IS'' without any warranties of any kind.
13 */
14
15/*
16 * Format of an IP firewall descriptor
17 *
18 * src, dst, src_mask, dst_mask are always stored in network byte order.
19 * flags and num_*_ports are stored in host byte order (of course).
20 * Port numbers are stored in HOST byte order.
21 */
22#ifndef _IP_FW_H
23#define _IP_FW_H
24
25struct ip_fw {
26    struct ip_fw *next;			/* Next firewall on chain */
27    struct in_addr src, dst;		/* Source and destination IP addr */
28    struct in_addr src_mask, dst_mask;	/* Mask for src and dest IP addr */
29    u_short flags;			/* Flags word */
30    u_short n_src_p, n_dst_p;           /* # of src ports and # of dst ports */
31    					/* in ports array (dst ports follow */
32    					/* src ports; max of 10 ports in all; */
33    					/* count of 0 means match all ports) */
34#define IP_FW_MAX_PORTS	10      	/* A reasonable maximum */
35    u_short ports[IP_FW_MAX_PORTS];     /* Array of port numbers to match */
36    u_long p_cnt,b_cnt;			/* Packet and byte counters */
37};
38
39/*
40 * Values for "flags" field .
41 */
42
43#define IP_FW_F_ALL	0x000	/* This is a universal packet firewall*/
44#define IP_FW_F_TCP	0x001	/* This is a TCP packet firewall      */
45#define IP_FW_F_UDP	0x002	/* This is a UDP packet firewall      */
46#define IP_FW_F_ICMP	0x003	/* This is a ICMP packet firewall     */
47#define IP_FW_F_KIND	0x003	/* Mask to isolate firewall kind      */
48#define IP_FW_F_ACCEPT	0x004	/* This is an accept firewall (as     *
49				 *         opposed to a deny firewall)*
50				 *                                    */
51#define IP_FW_F_SRNG	0x008	/* The first two src ports are a min  *
52				 * and max range (stored in host byte *
53				 * order).                            *
54				 *                                    */
55#define IP_FW_F_DRNG	0x010	/* The first two dst ports are a min  *
56				 * and max range (stored in host byte *
57				 * order).                            *
58				 * (ports[0] <= port <= ports[1])     *
59				 *                                    */
60#define IP_FW_F_PRN	0x020	/* In verbose mode print this firewall*/
61#define IP_FW_F_BIDIR	0x040	/* For accounting-count two way       */
62#define IP_FW_F_TCPSYN	0x080	/* For tcp packets-check SYN only     */
63#define IP_FW_F_ICMPRPL	0x100	/* Send back icmp unreachable packet  */
64#define IP_FW_F_MASK	0x1FF	/* All possible flag bits mask        */
65
66/*
67 * New IP firewall options for [gs]etsockopt at the RAW IP level.
68 */
69#define IP_FW_BASE_CTL	53
70
71#define IP_FW_ADD_BLK (IP_FW_BASE_CTL)
72#define IP_FW_ADD_FWD (IP_FW_BASE_CTL+1)
73#define IP_FW_CHK_BLK (IP_FW_BASE_CTL+2)
74#define IP_FW_CHK_FWD (IP_FW_BASE_CTL+3)
75#define IP_FW_DEL_BLK (IP_FW_BASE_CTL+4)
76#define IP_FW_DEL_FWD (IP_FW_BASE_CTL+5)
77#define IP_FW_FLUSH   (IP_FW_BASE_CTL+6)
78#define IP_FW_POLICY  (IP_FW_BASE_CTL+7)
79
80#define IP_ACCT_ADD   (IP_FW_BASE_CTL+10)
81#define IP_ACCT_DEL   (IP_FW_BASE_CTL+11)
82#define IP_ACCT_FLUSH (IP_FW_BASE_CTL+12)
83#define IP_ACCT_ZERO  (IP_FW_BASE_CTL+13)
84
85/*
86 * Policy flags...
87 */
88#define IP_FW_P_DENY		0x01
89#define IP_FW_P_ICMP		0x02
90#define IP_FW_P_MASK		0x03
91
92
93/*
94 * Main firewall chains definitions and global var's definitions.
95 */
96#ifdef KERNEL
97#ifdef IPFIREWALL
98extern struct ip_fw *ip_fw_blk_chain;
99extern struct ip_fw *ip_fw_fwd_chain;
100extern u_short ip_fw_policy;
101#endif
102#ifdef IPACCT
103extern struct ip_fw *ip_acct_chain;
104#endif
105#endif /* KERNEL */
106
107#endif /* _IP_FW_H */
108