ip_fw.h revision 5085 
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    struct in_addr via;			/* IP addr of interface "via" */
30    u_short flags;			/* Flags word */
31    u_short n_src_p, n_dst_p;           /* # of src ports and # of dst ports */
32    					/* in ports array (dst ports follow */
33    					/* src ports; max of 10 ports in all; */
34    					/* count of 0 means match all ports) */
35#define IP_FW_MAX_PORTS	10      	/* A reasonable maximum */
36    u_short ports[IP_FW_MAX_PORTS];     /* Array of port numbers to match */
37    u_long p_cnt,b_cnt;			/* Packet and byte counters */
38};
39
40/*
41 * Values for "flags" field .
42 */
43
44#define IP_FW_F_ALL	0x000	/* This is a universal packet firewall*/
45#define IP_FW_F_TCP	0x001	/* This is a TCP packet firewall      */
46#define IP_FW_F_UDP	0x002	/* This is a UDP packet firewall      */
47#define IP_FW_F_ICMP	0x003	/* This is a ICMP packet firewall     */
48#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