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 * $Id: ip_fw.h,v 1.13 1995/07/23 05:36:30 davidg Exp $ 15 */ 16 17 /* 18 * Format of an IP firewall descriptor 19 * 20 * fw_src, fw_dst, fw_smsk, fw_dmsk are always stored in network byte order. 21 * fw_flg and fw_n*p are stored in host byte order (of course). 22 * Port numbers are stored in HOST byte order. 23 */ 24 #ifndef _IP_FW_H 25 #define _IP_FW_H 26 27 struct ip_fw { 28 struct ip_fw *fw_next; /* Next firewall on chain */ 29 struct in_addr fw_src, fw_dst; /* Source and destination IP addr */ 30 struct in_addr fw_smsk, fw_dmsk; /* Mask for src and dest IP addr */ 31 /* 32 * This union keeps all "via" information. 33 * If ever fu_via_ip is 0,or IP_FW_F_IFNAME set and 34 * fu_via_name[0] is 0 - match any packet. 35 */ 36 union { 37 struct in_addr fu_via_ip; 38 struct { 39 #define FW_IFNLEN 6 /* To keep structure on 2^x boundary */ 40 char fu_via_name[FW_IFNLEN]; 41 short fu_via_unit; 42 } fu_via_if; 43 } fu_via_un; 44 u_short fw_flg; /* Flags word */ 45 u_short fw_nsp, fw_ndp; /* N'of src ports and # of dst ports */ 46 /* in ports array (dst ports follow */ 47 /* src ports; max of 10 ports in all; */ 48 /* count of 0 means match all ports) */ 49 #define IP_FW_MAX_PORTS 10 /* A reasonable maximum */ 50 u_short fw_pts[IP_FW_MAX_PORTS]; /* Array of port numbers to match */ 51 u_long fw_pcnt,fw_bcnt; /* Packet and byte counters */ 52 u_char fw_ipopt,fw_ipnopt; /* IP options set/unset */ 53 u_char fw_tcpf,fw_tcpnf; /* TCP flags sen/unset */ 54 }; 55 56 57 /* 58 * Definitions to make expressions 59 * for "via" stuff shorter. 60 */ 61 #define fw_via_ip fu_via_un.fu_via_ip 62 #define fw_via_name fu_via_un.fu_via_if.fu_via_name 63 #define fw_via_unit fu_via_un.fu_via_if.fu_via_unit 64 65 /* 66 * Values for "flags" field . 67 */ 68 69 #define IP_FW_F_ALL 0x000 /* This is a universal packet firewall*/ 70 #define IP_FW_F_TCP 0x001 /* This is a TCP packet firewall */ 71 #define IP_FW_F_UDP 0x002 /* This is a UDP packet firewall */ 72 #define IP_FW_F_ICMP 0x003 /* This is a ICMP packet firewall */ 73 #define IP_FW_F_KIND 0x003 /* Mask to isolate firewall kind */ 74 #define IP_FW_F_ACCEPT 0x004 /* This is an accept firewall (as * 75 * opposed to a deny firewall)* 76 * */ 77 #define IP_FW_F_SRNG 0x008 /* The first two src ports are a min * 78 * and max range (stored in host byte * 79 * order). * 80 * */ 81 #define IP_FW_F_DRNG 0x010 /* The first two dst ports are a min * 82 * and max range (stored in host byte * 83 * order). * 84 * (ports[0] <= port <= ports[1]) * 85 * */ 86 #define IP_FW_F_PRN 0x020 /* In verbose mode print this firewall*/ 87 #define IP_FW_F_BIDIR 0x040 /* For accounting-count two way */ 88 #define IP_FW_F_ICMPRPL 0x100 /* Send back icmp unreachable packet */ 89 #define IP_FW_F_IFNAME 0x200 /* Use interface name/unit (not IP) */ 90 #define IP_FW_F_MASK 0x3FF /* All possible flag bits mask */ 91 92 /* 93 * Definitions for IP option names. 94 */ 95 #define IP_FW_IPOPT_LSRR 0x01 96 #define IP_FW_IPOPT_SSRR 0x02 97 #define IP_FW_IPOPT_RR 0x04 98 #define IP_FW_IPOPT_TS 0x08 99 100 /* 101 * Definitions for TCP flags. 102 */ 103 #define IP_FW_TCPF_FIN TH_FIN 104 #define IP_FW_TCPF_SYN TH_SYN 105 #define IP_FW_TCPF_RST TH_RST 106 #define IP_FW_TCPF_PUSH TH_PUSH 107 #define IP_FW_TCPF_ACK TH_ACK 108 #define IP_FW_TCPF_URG TH_URG 109 110 /* 111 * New IP firewall options for [gs]etsockopt at the RAW IP level. 112 */ 113 #define IP_FW_BASE_CTL 53 114 115 #define IP_FW_ADD (IP_FW_BASE_CTL) 116 #define IP_FW_DEL (IP_FW_BASE_CTL+4) 117 #define IP_FW_FLUSH (IP_FW_BASE_CTL+6) 118 #define IP_FW_POLICY (IP_FW_BASE_CTL+7) 119 120 #define IP_ACCT_ADD (IP_FW_BASE_CTL+10) 121 #define IP_ACCT_DEL (IP_FW_BASE_CTL+11) 122 #define IP_ACCT_FLUSH (IP_FW_BASE_CTL+12) 123 #define IP_ACCT_ZERO (IP_FW_BASE_CTL+13) 124 #define IP_ACCT_CLR (IP_FW_BASE_CTL+14) 125 126 /* 127 * Policy flags... 128 */ 129 #define IP_FW_P_DENY 0x01 130 #define IP_FW_P_ICMP 0x02 131 #define IP_FW_P_MBIPO 0x04 132 #define IP_FW_P_MASK 0x07 133 134 135 /* 136 * Main firewall chains definitions and global var's definitions. 137 */ 138 #ifdef KERNEL 139 140 /* 141 * Variables/chain. 142 */ 143 extern struct ip_fw *ip_fw_chain; 144 extern u_short ip_fw_policy; 145 146 extern struct ip_fw *ip_acct_chain; 147 148 /* 149 * Function pointers. 150 */ 151 extern int (*ip_fw_chk_ptr)(struct mbuf *, struct ip *,struct ifnet *,struct ip_fw *); 152 extern int (*ip_fw_ctl_ptr)(int,struct mbuf *); 153 154 extern void (*ip_acct_cnt_ptr)(struct ip *,struct ifnet *,struct ip_fw *,int); 155 extern int (*ip_acct_ctl_ptr)(int,struct mbuf *); 156 157 /* 158 * Function definitions. 159 */ 160 int ip_fw_chk(struct mbuf *, struct ip *,struct ifnet *,struct ip_fw *); 161 int ip_fw_ctl(int,struct mbuf *); 162 163 void ip_acct_cnt(struct ip *,struct ifnet *,struct ip_fw *,int); 164 int ip_acct_ctl(int,struct mbuf *); 165 166 #endif /* KERNEL */ 167 168 #endif /* _IP_FW_H */ 169