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/*
* 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 1.22 1996/08/13 19:43:41 pst 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 _IP_FW_H
#define _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_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
/*
* Main firewall chains definitions and global var's definitions.
*/
#ifdef KERNEL
/*
* Function definitions.
*/
void ip_fw_init(void);
#endif /* KERNEL */
#endif /* _IP_FW_H */
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