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78 lines
2.8 KiB
C
78 lines
2.8 KiB
C
/*
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* Copyright (c) 1993 Daniel Boulet
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* Copyright (c) 1994 Ugen J.S.Antsilevich
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*
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* Redistribution and use in source forms, with and without modification,
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* are permitted provided that this entire comment appears intact.
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*
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* Redistribution in binary form may occur without any restrictions.
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* Obviously, it would be nice if you gave credit where credit is due
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* but requiring it would be too onerous.
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*
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* This software is provided ``AS IS'' without any warranties of any kind.
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*/
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/*
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* Format of an IP firewall descriptor
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*
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* src, dst, src_mask, dst_mask are always stored in network byte order.
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* flags and num_*_ports are stored in host byte order (of course).
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* Port numbers are stored in HOST byte order.
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*/
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struct ip_firewall {
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struct ip_firewall *next; /* Next firewall on chain */
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struct in_addr src, dst; /* Source and destination IP addr */
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struct in_addr src_mask, dst_mask; /* Mask for src and dest IP addr */
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u_short flags;
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#define IP_FIREWALL_UNIVERSAL 0 /* This is a universal packet firewall*/
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#define IP_FIREWALL_TCP 1 /* This is a TCP packet firewall */
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#define IP_FIREWALL_UDP 2 /* This is a UDP packet firewall */
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#define IP_FIREWALL_ICMP 3 /* This is a ICMP packet firewall */
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#define IP_FIREWALL_KIND 3 /* Mask to isolate firewall kind */
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#define IP_FIREWALL_ACCEPT 4 /* This is an accept firewall (as */
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/* opposed to a deny firewall) */
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#define IP_FIREWALL_SRC_RANGE 8 /* The first two src ports are a min
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* and max range (stored in host byte
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* order).
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*/
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#define IP_FIREWALL_DST_RANGE 16 /* The first two dst ports are a min
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* and max range (stored in host byte
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* order).
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* (ports[0] <= port <= ports[1])
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*/
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#define IP_FIREWALL_FLAG_BITS 0x1f /* All possible flag bits */
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u_short num_src_ports, num_dst_ports;/* # of src ports and # of dst ports */
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/* in ports array (dst ports follow */
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/* src ports; max of 10 ports in all; */
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/* count of 0 means match all ports) */
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#define IP_FIREWALL_MAX_PORTS 10 /* A reasonable maximum */
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u_short ports[IP_FIREWALL_MAX_PORTS]; /* Array of port numbers to match */
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};
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/*
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* New IP firewall options for [gs]etsockopt at the RAW IP level.
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*/
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#define IP_FW_BASE_CTL 53
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#define IP_FW_ADD_BLK (IP_FW_BASE_CTL)
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#define IP_FW_ADD_FWD (IP_FW_BASE_CTL+1)
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#define IP_FW_CHK_BLK (IP_FW_BASE_CTL+2)
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#define IP_FW_CHK_FWD (IP_FW_BASE_CTL+3)
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#define IP_FW_DEL_BLK (IP_FW_BASE_CTL+4)
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#define IP_FW_DEL_FWD (IP_FW_BASE_CTL+5)
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#define IP_FW_FLUSH (IP_FW_BASE_CTL+6)
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#define IP_FW_POLICY (IP_FW_BASE_CTL+7)
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extern struct ip_firewall *ip_fw_blk_chain;
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extern struct ip_firewall *ip_fw_fwd_chain;
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extern int ip_fw_policy;
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#ifdef IPFIREWALL_VERBOSE
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#define ip_firewall_check ip_firewall_check_print
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#else
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#define ip_firewall_check ip_firewall_check_noprint
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#endif
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