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/*
* Copyright (c) 1993 Daniel Boulet
* Copyright (c) 1994 Ugen J.S.Antsilevich
*
* Redistribution and use in source forms, with and without modification,
* are permitted provided that this entire comment appears intact.
*
* Redistribution in binary form may occur without any restrictions.
* Obviously, it would be nice if you gave credit where credit is due
* but requiring it would be too onerous.
*
* This software is provided ``AS IS'' without any warranties of any kind.
*/
/*
* Format of an IP firewall descriptor
*
* fw_src, fw_dst, fw_smsk, fw_dmsk are always stored in network byte order.
* fw_flg and fw_n*p are stored in host byte order (of course).
* Port numbers are stored in HOST byte order.
*/
#ifndef _IP_FW_H
#define _IP_FW_H
struct ip_fw {
struct ip_fw *fw_next; /* Next firewall on chain */
struct in_addr fw_src, fw_dst; /* Source and destination IP addr */
struct in_addr fw_smsk, fw_dmsk; /* Mask for src and dest IP addr */
struct in_addr fw_via; /* IP addr of interface "via" */
u_short fw_flg; /* Flags word */
u_short fw_nsp, fw_ndp; /* N'of src ports and # of dst ports */
/* in ports array (dst ports follow */
/* src ports; max of 10 ports in all; */
/* count of 0 means match all ports) */
#define IP_FW_MAX_PORTS 10 /* A reasonable maximum */
u_short fw_pts[IP_FW_MAX_PORTS]; /* Array of port numbers to match */
u_long fw_pcnt,fw_bcnt; /* Packet and byte counters */
};
/*
* Values for "flags" field .
*/
#define IP_FW_F_ALL 0x000 /* This is a universal packet firewall*/
#define IP_FW_F_TCP 0x001 /* This is a TCP packet firewall */
#define IP_FW_F_UDP 0x002 /* This is a UDP packet firewall */
#define IP_FW_F_ICMP 0x003 /* This is a ICMP packet firewall */
#define IP_FW_F_KIND 0x003 /* Mask to isolate firewall kind */
#define IP_FW_F_ACCEPT 0x004 /* This is an accept firewall (as *
* opposed to a deny firewall)*
* */
#define IP_FW_F_SRNG 0x008 /* The first two src ports are a min *
* and max range (stored in host byte *
* order). *
* */
#define IP_FW_F_DRNG 0x010 /* The first two dst ports are a min *
* and max range (stored in host byte *
* order). *
* (ports[0] <= port <= ports[1]) *
* */
#define IP_FW_F_PRN 0x020 /* In verbose mode print this firewall*/
#define IP_FW_F_BIDIR 0x040 /* For accounting-count two way */
#define IP_FW_F_TCPSYN 0x080 /* For tcp packets-check SYN only */
#define IP_FW_F_ICMPRPL 0x100 /* Send back icmp unreachable packet */
#define IP_FW_F_MASK 0x1FF /* All possible flag bits mask */
/*
* New IP firewall options for [gs]etsockopt at the RAW IP level.
*/
#define IP_FW_BASE_CTL 53
#define IP_FW_ADD_BLK (IP_FW_BASE_CTL)
#define IP_FW_ADD_FWD (IP_FW_BASE_CTL+1)
#define IP_FW_DEL_BLK (IP_FW_BASE_CTL+4)
#define IP_FW_DEL_FWD (IP_FW_BASE_CTL+5)
#define IP_FW_FLUSH (IP_FW_BASE_CTL+6)
#define IP_FW_POLICY (IP_FW_BASE_CTL+7)
#define IP_ACCT_ADD (IP_FW_BASE_CTL+10)
#define IP_ACCT_DEL (IP_FW_BASE_CTL+11)
#define IP_ACCT_FLUSH (IP_FW_BASE_CTL+12)
#define IP_ACCT_ZERO (IP_FW_BASE_CTL+13)
#define IP_ACCT_CLR (IP_FW_BASE_CTL+14)
/*
* Policy flags...
*/
#define IP_FW_P_DENY 0x01
#define IP_FW_P_ICMP 0x02
#define IP_FW_P_MASK 0x03
/*
* Main firewall chains definitions and global var's definitions.
*/
#ifdef KERNEL
#ifdef IPFIREWALL
extern struct ip_fw *ip_fw_blk_chain;
extern struct ip_fw *ip_fw_fwd_chain;
extern u_short ip_fw_policy;
#endif
#ifdef IPACCT
extern struct ip_fw *ip_acct_chain;
#endif
#endif /* KERNEL */
#endif /* _IP_FW_H */
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