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 * $FreeBSD$ 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 u_long fw_pcnt,fw_bcnt; /* Packet and byte counters */ 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 union { 32 struct in_addr fu_via_ip; /* Specified by IP address */ 33 struct { /* Specified by interface name */ 34 #define FW_IFNLEN 6 /* To keep structure on 2^x boundary */ 35 char fu_via_name[FW_IFNLEN]; 36 short fu_via_unit; 37 } fu_via_if; 38 } fu_via_un; 39 #define fw_via_ip fu_via_un.fu_via_ip 40 #define fw_via_name fu_via_un.fu_via_if.fu_via_name 41 #define fw_via_unit fu_via_un.fu_via_if.fu_via_unit 42 u_short fw_number; 43 u_short fw_flg; /* Flags word */ 44 u_short fw_nsp, fw_ndp; /* N'of src ports and # of dst ports */ 45 /* in ports array (dst ports follow */ 46 /* src ports; max of 10 ports in all; */ 47 /* count of 0 means match all ports) */ 48 #define IP_FW_MAX_PORTS 10 /* A reasonable maximum */ 49 u_short fw_pts[IP_FW_MAX_PORTS]; /* Array of port numbers to match */ 50 u_char fw_ipopt,fw_ipnopt; /* IP options set/unset */ 51 u_char fw_tcpf,fw_tcpnf; /* TCP flags set/unset */ 52 #define IP_FW_ICMPTYPES_DIM (256 / (sizeof(unsigned) * 8)) 53 unsigned fw_icmptypes[IP_FW_ICMPTYPES_DIM]; /* ICMP types bitmap */ 54 long timestamp; /* timestamp (tv_sec) of last match */ 55 u_short fw_divert_port; /* Divert port (options IPDIVERT) */ 56 u_char fw_prot; /* IP protocol */ 57 }; 58 59 struct ip_fw_chain { 60 LIST_ENTRY(ip_fw_chain) chain; 61 struct ip_fw *rule; 62 }; 63 64 /* 65 * Values for "flags" field . 66 */ 67 #define IP_FW_F_INVSRC 0x0001 /* Invert sense of src check */ 68 #define IP_FW_F_INVDST 0x0002 /* Invert sense of dst check */ 69 #define IP_FW_F_IN 0x0004 /* Inbound */ 70 #define IP_FW_F_OUT 0x0008 /* Outbound */ 71 72 #define IP_FW_F_COMMAND 0x0030 /* Mask for type of chain entry: */ 73 #define IP_FW_F_ACCEPT 0x0010 /* This is an accept rule */ 74 #define IP_FW_F_COUNT 0x0020 /* This is a count rule */ 75 #define IP_FW_F_DIVERT 0x0030 /* This is a divert rule */ 76 #define IP_FW_F_DENY 0x0000 /* This is a deny rule */ 77 78 #define IP_FW_F_PRN 0x0040 /* Print if this rule matches */ 79 #define IP_FW_F_ICMPRPL 0x0080 /* Send back icmp unreachable packet */ 80 81 #define IP_FW_F_SRNG 0x0100 /* The first two src ports are a min * 82 * and max range (stored in host byte * 83 * order). */ 84 85 #define IP_FW_F_DRNG 0x0200 /* The first two dst ports are a min * 86 * and max range (stored in host byte * 87 * order). */ 88 89 #define IP_FW_F_IFNAME 0x0400 /* Use interface name/unit (not IP) */ 90 91 #define IP_FW_F_FRAG 0x0800 /* Fragment */ 92 93 #define IP_FW_F_ICMPBIT 0x1000 /* ICMP type bitmap is valid */ 94 95 #define IP_FW_F_IFUWILD 0x2000 /* Match all interface units */ 96 97 #define IP_FW_F_MASK 0x3FFF /* All possible flag bits mask */ 98 99 /* 100 * Definitions for IP option names. 101 */ 102 #define IP_FW_IPOPT_LSRR 0x01 103 #define IP_FW_IPOPT_SSRR 0x02 104 #define IP_FW_IPOPT_RR 0x04 105 #define IP_FW_IPOPT_TS 0x08 106 107 /* 108 * Definitions for TCP flags. 109 */ 110 #define IP_FW_TCPF_FIN TH_FIN 111 #define IP_FW_TCPF_SYN TH_SYN 112 #define IP_FW_TCPF_RST TH_RST 113 #define IP_FW_TCPF_PSH TH_PUSH 114 #define IP_FW_TCPF_ACK TH_ACK 115 #define IP_FW_TCPF_URG TH_URG 116 #define IP_FW_TCPF_ESTAB 0x40 117 118 /* 119 * Main firewall chains definitions and global var's definitions. 120 */ 121 #ifdef KERNEL 122 123 /* 124 * Function definitions. 125 */ 126 void ip_fw_init(void); 127 128 #endif /* KERNEL */ 129 130 #endif /* _IP_FW_H */ 131