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23bf99538c
Change interface between netinet and ip_fw to be more general, and thus hopefully also support other ip filtering implementations.
134 lines
4.1 KiB
C
134 lines
4.1 KiB
C
/*
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* Copyright (c) 1993 Daniel Boulet
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* Copyright (c) 1994 Ugen J.S.Antsilevich
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*
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* Redistribution and use in source forms, with and without modification,
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* are permitted provided that this entire comment appears intact.
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*
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* Redistribution in binary form may occur without any restrictions.
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* Obviously, it would be nice if you gave credit where credit is due
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* but requiring it would be too onerous.
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*
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* This software is provided ``AS IS'' without any warranties of any kind.
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*
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* $Id: ip_fw.h,v 1.17 1996/02/24 13:38:27 phk Exp $
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*/
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/*
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* Format of an IP firewall descriptor
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*
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* fw_src, fw_dst, fw_smsk, fw_dmsk are always stored in network byte order.
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* fw_flg and fw_n*p are stored in host byte order (of course).
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* Port numbers are stored in HOST byte order.
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*/
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#ifndef _IP_FW_H
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#define _IP_FW_H
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struct ip_fw {
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u_long fw_pcnt,fw_bcnt; /* Packet and byte counters */
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struct in_addr fw_src, fw_dst; /* Source and destination IP addr */
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struct in_addr fw_smsk, fw_dmsk; /* Mask for src and dest IP addr */
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union {
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struct in_addr fu_via_ip;
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struct {
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#define FW_IFNLEN 6 /* To keep structure on 2^x boundary */
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char fu_via_name[FW_IFNLEN];
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short fu_via_unit;
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} fu_via_if;
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} fu_via_un;
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#define fw_via_ip fu_via_un.fu_via_ip
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#define fw_via_name fu_via_un.fu_via_if.fu_via_name
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#define fw_via_unit fu_via_un.fu_via_if.fu_via_unit
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u_short fw_number;
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u_short fw_flg; /* Flags word */
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u_short fw_nsp, fw_ndp; /* N'of src ports and # of dst ports */
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/* in ports array (dst ports follow */
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/* src ports; max of 10 ports in all; */
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/* count of 0 means match all ports) */
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#define IP_FW_MAX_PORTS 10 /* A reasonable maximum */
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u_short fw_pts[IP_FW_MAX_PORTS]; /* Array of port numbers to match */
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u_char fw_ipopt,fw_ipnopt; /* IP options set/unset */
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u_char fw_tcpf,fw_tcpnf; /* TCP flags sen/unset */
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};
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struct ip_fw_chain {
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LIST_ENTRY(ip_fw_chain) chain;
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struct ip_fw *rule;
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};
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/*
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* Values for "flags" field .
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*/
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#define IP_FW_F_ALL 0x000 /* This is a universal packet rule */
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#define IP_FW_F_TCP 0x001 /* This is a TCP packet rule */
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#define IP_FW_F_UDP 0x002 /* This is a UDP packet rule */
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#define IP_FW_F_ICMP 0x003 /* This is a ICMP packet rule */
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#define IP_FW_F_KIND 0x003 /* Mask to isolate rule kind */
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#define IP_FW_F_IN 0x004 /* Inbound */
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#define IP_FW_F_OUT 0x008 /* Outboun */
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#define IP_FW_F_ACCEPT 0x010 /* This is an accept rule */
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#define IP_FW_F_COUNT 0x020 /* This is an accept rule */
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#define IP_FW_F_PRN 0x040 /* Print if this rule matches */
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#define IP_FW_F_ICMPRPL 0x080 /* Send back icmp unreachable packet */
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#define IP_FW_F_SRNG 0x100 /* The first two src ports are a min *
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* and max range (stored in host byte *
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* order). */
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#define IP_FW_F_DRNG 0x200 /* The first two dst ports are a min *
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* and max range (stored in host byte *
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* order). */
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#define IP_FW_F_IFNAME 0x400 /* Use interface name/unit (not IP) */
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#define IP_FW_F_FRAG 0x800 /* Fragment */
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#define IP_FW_F_MASK 0xFFF /* All possible flag bits mask */
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/*
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* Definitions for IP option names.
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*/
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#define IP_FW_IPOPT_LSRR 0x01
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#define IP_FW_IPOPT_SSRR 0x02
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#define IP_FW_IPOPT_RR 0x04
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#define IP_FW_IPOPT_TS 0x08
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/*
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* Definitions for TCP flags.
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*/
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#define IP_FW_TCPF_FIN TH_FIN
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#define IP_FW_TCPF_SYN TH_SYN
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#define IP_FW_TCPF_RST TH_RST
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#define IP_FW_TCPF_PSH TH_PUSH
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#define IP_FW_TCPF_ACK TH_ACK
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#define IP_FW_TCPF_URG TH_URG
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#define IP_FW_TCPF_ESTAB 0x40
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/*
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* New IP firewall options for [gs]etsockopt at the RAW IP level.
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*/
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#define IP_FW_BASE_CTL 50
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#define IP_FW_ADD (IP_FW_BASE_CTL+0)
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#define IP_FW_DEL (IP_FW_BASE_CTL+1)
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#define IP_FW_FLUSH (IP_FW_BASE_CTL+2)
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#define IP_FW_ZERO (IP_FW_BASE_CTL+3)
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#define IP_FW_GET (IP_FW_BASE_CTL+4)
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/*
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* Main firewall chains definitions and global var's definitions.
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*/
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#ifdef KERNEL
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/*
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* Function definitions.
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*/
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void ip_fw_init(void);
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#endif /* KERNEL */
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#endif /* _IP_FW_H */
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