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 * fw_src, fw_dst, fw_smsk, fw_dmsk are always stored in network byte order. 19 * fw_flg and fw_n*p 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 25 struct ip_fw { 26 struct ip_fw *fw_next; /* Next firewall on chain */ 27 struct in_addr fw_src, fw_dst; /* Source and destination IP addr */ 28 struct in_addr fw_smsk, fw_dmsk; /* Mask for src and dest IP addr */ 29 struct in_addr fw_via; /* IP addr of interface "via" */ 30 u_short fw_flg; /* Flags word */ 31 u_short fw_nsp, fw_ndp; /* N'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 fw_pts[IP_FW_MAX_PORTS]; /* Array of port numbers to match */ 37 u_long fw_pcnt,fw_bcnt; /* 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 (IP_FW_BASE_CTL) 73 #define IP_FW_DEL (IP_FW_BASE_CTL+4) 74 #define IP_FW_FLUSH (IP_FW_BASE_CTL+6) 75 #define IP_FW_POLICY (IP_FW_BASE_CTL+7) 76 77 #define IP_ACCT_ADD (IP_FW_BASE_CTL+10) 78 #define IP_ACCT_DEL (IP_FW_BASE_CTL+11) 79 #define IP_ACCT_FLUSH (IP_FW_BASE_CTL+12) 80 #define IP_ACCT_ZERO (IP_FW_BASE_CTL+13) 81 #define IP_ACCT_CLR (IP_FW_BASE_CTL+14) 82 83 /* 84 * Policy flags... 85 */ 86 #define IP_FW_P_DENY 0x01 87 #define IP_FW_P_ICMP 0x02 88 #define IP_FW_P_MASK 0x03 89 90 91 /* 92 * Main firewall chains definitions and global var's definitions. 93 */ 94 #ifdef KERNEL 95 96 /* 97 * Variables/chain. 98 */ 99 extern struct ip_fw *ip_fw_chain; 100 extern u_short ip_fw_policy; 101 102 extern struct ip_fw *ip_acct_chain; 103 104 /* 105 * Function pointers. 106 */ 107 extern int (*ip_fw_chk_ptr)(struct ip *,struct ifnet *,struct ip_fw *); 108 extern int (*ip_fw_ctl_ptr)(int,struct mbuf *); 109 110 extern void (*ip_acct_cnt_ptr)(struct ip *,struct ifnet *,struct ip_fw *,int); 111 extern int (*ip_acct_ctl_ptr)(int,struct mbuf *); 112 113 /* 114 * Function definitions. 115 */ 116 int ip_fw_chk(struct ip *,struct ifnet *,struct ip_fw *); 117 int ip_fw_ctl(int,struct mbuf *); 118 119 void ip_acct_cnt(struct ip *,struct ifnet *,struct ip_fw *,int); 120 int ip_acct_ctl(int,struct mbuf *); 121 122 #endif /* KERNEL */ 123 124 #endif /* _IP_FW_H */ 125