/* Copyright (C) 1991, 92, 93, 95, 96, 97 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* This header file was taken from linux (2.1.26) sources and modified * to work under GNU LIBC 2.0. */ /* * 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. */ /* * Format of an IP firewall descriptor * * src, dst, src_mask, dst_mask are always stored in network byte order. * flags and num_*_ports are stored in host byte order (of course). * Port numbers are stored in HOST byte order. */ #ifndef _NETINET_FW_H #define _NETINET_FW_H #include #include #include #include #include #include #include #include __BEGIN_DECLS struct ip_fw { struct ip_fw *fw_next; /* Next firewall on chain */ 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 */ struct in_addr fw_via; /* IP address of interface "via" */ void *fw_viadev; /* device of interface "via" */ u_int16_t fw_flg; /* Flags word */ u_int16_t 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_int16_t fw_pts[IP_FW_MAX_PORTS]; /* Array of port numbers to match */ u_int32_t fw_pcnt, fw_bcnt; /* Packet and byte counters */ u_int8_t fw_tosand, fw_tosxor; /* Revised packet priority */ char fw_vianame[IFNAMSIZ]; /* name of interface "via" */ }; /* * Values for "flags" field . */ #define IP_FW_F_ALL 0x0000 /* This is a universal packet firewall*/ #define IP_FW_F_TCP 0x0001 /* This is a TCP packet firewall */ #define IP_FW_F_UDP 0x0002 /* This is a UDP packet firewall */ #define IP_FW_F_ICMP 0x0003 /* This is a ICMP packet firewall */ #define IP_FW_F_KIND 0x0003 /* Mask to isolate firewall kind */ #define IP_FW_F_ACCEPT 0x0004 /* This is an accept firewall (as * * opposed to a deny firewall)* * */ #define IP_FW_F_SRNG 0x0008 /* The first two src ports are a min * * and max range (stored in host byte * * order). * * */ #define IP_FW_F_DRNG 0x0010 /* The first two dst ports are a min * * and max range (stored in host byte * * order). * * (ports[0] <= port <= ports[1]) * * */ #define IP_FW_F_PRN 0x0020 /* In verbose mode print this firewall*/ #define IP_FW_F_BIDIR 0x0040 /* For bidirectional firewalls */ #define IP_FW_F_TCPSYN 0x0080 /* For tcp packets-check SYN only */ #define IP_FW_F_ICMPRPL 0x0100 /* Send back icmp unreachable packet */ #define IP_FW_F_MASQ 0x0200 /* Masquerading */ #define IP_FW_F_TCPACK 0x0400 /* For tcp-packets match if ACK is set*/ #define IP_FW_F_REDIR 0x0800 /* Redirect to local port fw_pts[n] */ #define IP_FW_F_ACCTIN 0x1000 /* Account incoming packets only. */ #define IP_FW_F_ACCTOUT 0x2000 /* Account outgoing packets only. */ #define IP_FW_F_MASK 0x3FFF /* All possible flag bits mask */ /* * New IP firewall options for [gs]etsockopt at the RAW IP level. * Unlike BSD Linux inherits IP options so you don't have to use * a raw socket for this. Instead we check rights in the calls. */ #define IP_FW_BASE_CTL 64 /* base for firewall socket options */ #define IP_FW_COMMAND 0x00FF /* mask for command without chain */ #define IP_FW_TYPE 0x0300 /* mask for type (chain) */ #define IP_FW_SHIFT 8 /* shift count for type (chain) */ #define IP_FW_FWD 0 #define IP_FW_IN 1 #define IP_FW_OUT 2 #define IP_FW_ACCT 3 #define IP_FW_CHAINS 4 /* total number of ip_fw chains */ #define IP_FW_INSERT (IP_FW_BASE_CTL) #define IP_FW_APPEND (IP_FW_BASE_CTL+1) #define IP_FW_DELETE (IP_FW_BASE_CTL+2) #define IP_FW_FLUSH (IP_FW_BASE_CTL+3) #define IP_FW_ZERO (IP_FW_BASE_CTL+4) #define IP_FW_POLICY (IP_FW_BASE_CTL+5) #define IP_FW_CHECK (IP_FW_BASE_CTL+6) #define IP_FW_MASQ_TIMEOUTS (IP_FW_BASE_CTL+7) #define IP_FW_INSERT_FWD (IP_FW_INSERT | (IP_FW_FWD << IP_FW_SHIFT)) #define IP_FW_APPEND_FWD (IP_FW_APPEND | (IP_FW_FWD << IP_FW_SHIFT)) #define IP_FW_DELETE_FWD (IP_FW_DELETE | (IP_FW_FWD << IP_FW_SHIFT)) #define IP_FW_FLUSH_FWD (IP_FW_FLUSH | (IP_FW_FWD << IP_FW_SHIFT)) #define IP_FW_ZERO_FWD (IP_FW_ZERO | (IP_FW_FWD << IP_FW_SHIFT)) #define IP_FW_POLICY_FWD (IP_FW_POLICY | (IP_FW_FWD << IP_FW_SHIFT)) #define IP_FW_CHECK_FWD (IP_FW_CHECK | (IP_FW_FWD << IP_FW_SHIFT)) #define IP_FW_INSERT_IN (IP_FW_INSERT | (IP_FW_IN << IP_FW_SHIFT)) #define IP_FW_APPEND_IN (IP_FW_APPEND | (IP_FW_IN << IP_FW_SHIFT)) #define IP_FW_DELETE_IN (IP_FW_DELETE | (IP_FW_IN << IP_FW_SHIFT)) #define IP_FW_FLUSH_IN (IP_FW_FLUSH | (IP_FW_IN << IP_FW_SHIFT)) #define IP_FW_ZERO_IN (IP_FW_ZERO | (IP_FW_IN << IP_FW_SHIFT)) #define IP_FW_POLICY_IN (IP_FW_POLICY | (IP_FW_IN << IP_FW_SHIFT)) #define IP_FW_CHECK_IN (IP_FW_CHECK | (IP_FW_IN << IP_FW_SHIFT)) #define IP_FW_INSERT_OUT (IP_FW_INSERT | (IP_FW_OUT << IP_FW_SHIFT)) #define IP_FW_APPEND_OUT (IP_FW_APPEND | (IP_FW_OUT << IP_FW_SHIFT)) #define IP_FW_DELETE_OUT (IP_FW_DELETE | (IP_FW_OUT << IP_FW_SHIFT)) #define IP_FW_FLUSH_OUT (IP_FW_FLUSH | (IP_FW_OUT << IP_FW_SHIFT)) #define IP_FW_ZERO_OUT (IP_FW_ZERO | (IP_FW_OUT << IP_FW_SHIFT)) #define IP_FW_POLICY_OUT (IP_FW_POLICY | (IP_FW_OUT << IP_FW_SHIFT)) #define IP_FW_CHECK_OUT (IP_FW_CHECK | (IP_FW_OUT << IP_FW_SHIFT)) #define IP_ACCT_INSERT (IP_FW_INSERT | (IP_FW_ACCT << IP_FW_SHIFT)) #define IP_ACCT_APPEND (IP_FW_APPEND | (IP_FW_ACCT << IP_FW_SHIFT)) #define IP_ACCT_DELETE (IP_FW_DELETE | (IP_FW_ACCT << IP_FW_SHIFT)) #define IP_ACCT_FLUSH (IP_FW_FLUSH | (IP_FW_ACCT << IP_FW_SHIFT)) #define IP_ACCT_ZERO (IP_FW_ZERO | (IP_FW_ACCT << IP_FW_SHIFT)) struct ip_fwpkt { struct iphdr fwp_iph; /* IP header */ union { struct tcphdr fwp_tcph; /* TCP header or */ struct udphdr fwp_udph; /* UDP header */ struct icmphdr fwp_icmph; /* ICMP header */ } fwp_protoh; struct in_addr fwp_via; /* interface address */ char fwp_vianame[IFNAMSIZ]; /* interface name */ }; /* * timeouts for ip masquerading */ struct ip_fw_masq; __END_DECLS #endif /* _NETINET_IP_FW_H */