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| /*!\file netinet/ip_fw.h |
| * IP firewall definitions. |
| */ |
| |
| /* |
| * 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. |
| * |
| * $Id: ip_fw.h,v 1.23.2.1 1997/01/29 13:15:43 adam Exp $ |
| */ |
| |
| /* |
| * 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 __NETINET_IP_FW_H |
| #define __NETINET_IP_FW_H |
| |
| struct ip_fw { |
| u_long fw_pcnt,fw_bcnt; /* Packet and byte counters */ |
| 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 */ |
| union { |
| struct in_addr fu_via_ip; /* Specified by IP address */ |
| struct { /* Specified by interface name */ |
| #define FW_IFNLEN 6 /* To keep structure on 2^x boundary */ |
| char fu_via_name[FW_IFNLEN]; |
| short fu_via_unit; |
| } fu_via_if; |
| } fu_via_un; |
| #define fw_via_ip fu_via_un.fu_via_ip |
| #define fw_via_name fu_via_un.fu_via_if.fu_via_name |
| #define fw_via_unit fu_via_un.fu_via_if.fu_via_unit |
| u_short fw_number; |
| 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_char fw_ipopt,fw_ipnopt; /* IP options set/unset */ |
| u_char fw_tcpf,fw_tcpnf; /* TCP flags set/unset */ |
| #define IP_FW_ICMPTYPES_DIM (256 / (sizeof(unsigned) * 8)) |
| unsigned fw_icmptypes[IP_FW_ICMPTYPES_DIM]; /* ICMP types bitmap */ |
| long timestamp; /* timestamp (tv_sec) of last match */ |
| u_short fw_divert_port; /* Divert port (options IPDIVERT) */ |
| u_char fw_prot; /* IP protocol */ |
| }; |
| |
| struct ip_fw_chain { |
| LIST_ENTRY(ip_fw_chain) chain; |
| struct ip_fw *rule; |
| }; |
| |
| /* |
| * Values for "flags" field . |
| */ |
| #define IP_FW_F_INVSRC 0x0001 /* Invert sense of src check */ |
| #define IP_FW_F_INVDST 0x0002 /* Invert sense of dst check */ |
| #define IP_FW_F_IN 0x0004 /* Inbound */ |
| #define IP_FW_F_OUT 0x0008 /* Outbound */ |
| |
| #define IP_FW_F_COMMAND 0x0030 /* Mask for type of chain entry: */ |
| #define IP_FW_F_ACCEPT 0x0010 /* This is an accept rule */ |
| #define IP_FW_F_COUNT 0x0020 /* This is a count rule */ |
| #define IP_FW_F_DIVERT 0x0030 /* This is a divert rule */ |
| #define IP_FW_F_DENY 0x0000 /* This is a deny rule */ |
| |
| #define IP_FW_F_PRN 0x0040 /* Print if this rule matches */ |
| #define IP_FW_F_ICMPRPL 0x0080 /* Send back icmp unreachable packet */ |
| |
| #define IP_FW_F_SRNG 0x0100 /* The first two src ports are a min * |
| * and max range (stored in host byte * |
| * order). */ |
| |
| #define IP_FW_F_DRNG 0x0200 /* The first two dst ports are a min * |
| * and max range (stored in host byte * |
| * order). */ |
| |
| #define IP_FW_F_IFNAME 0x0400 /* Use interface name/unit (not IP) */ |
| |
| #define IP_FW_F_FRAG 0x0800 /* Fragment */ |
| |
| #define IP_FW_F_ICMPBIT 0x1000 /* ICMP type bitmap is valid */ |
| |
| #define IP_FW_F_IFUWILD 0x2000 /* Match all interface units */ |
| |
| #define IP_FW_F_MASK 0x3FFF /* All possible flag bits mask */ |
| |
| /* |
| * Definitions for IP option names. |
| */ |
| #define IP_FW_IPOPT_LSRR 0x01 |
| #define IP_FW_IPOPT_SSRR 0x02 |
| #define IP_FW_IPOPT_RR 0x04 |
| #define IP_FW_IPOPT_TS 0x08 |
| |
| /* |
| * Definitions for TCP flags. |
| */ |
| #define IP_FW_TCPF_FIN TH_FIN |
| #define IP_FW_TCPF_SYN TH_SYN |
| #define IP_FW_TCPF_RST TH_RST |
| #define IP_FW_TCPF_PSH TH_PUSH |
| #define IP_FW_TCPF_ACK TH_ACK |
| #define IP_FW_TCPF_URG TH_URG |
| #define IP_FW_TCPF_ESTAB 0x40 |
| |
| #endif |