147 lines
4.7 KiB
C
147 lines
4.7 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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/*
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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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struct ip_fw *fw_next; /* Next firewall on chain */
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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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/*
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* This union keeps all "via" information.
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* If ever fu_via_ip is 0,or IP_FW_F_IFNAME set and
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* fu_via_name[0] is 0 - match any packet.
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*/
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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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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_long fw_pcnt,fw_bcnt; /* Packet and byte counters */
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};
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/*
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* Definitions to make expressions
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* for "via" stuff shorter.
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*/
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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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/*
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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 firewall*/
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#define IP_FW_F_TCP 0x001 /* This is a TCP packet firewall */
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#define IP_FW_F_UDP 0x002 /* This is a UDP packet firewall */
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#define IP_FW_F_ICMP 0x003 /* This is a ICMP packet firewall */
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#define IP_FW_F_KIND 0x003 /* Mask to isolate firewall kind */
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#define IP_FW_F_ACCEPT 0x004 /* This is an accept firewall (as *
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* opposed to a deny firewall)*
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* */
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#define IP_FW_F_SRNG 0x008 /* 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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* */
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#define IP_FW_F_DRNG 0x010 /* 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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* (ports[0] <= port <= ports[1]) *
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* */
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#define IP_FW_F_PRN 0x020 /* In verbose mode print this firewall*/
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#define IP_FW_F_BIDIR 0x040 /* For accounting-count two way */
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#define IP_FW_F_TCPSYN 0x080 /* For tcp packets-check SYN only */
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#define IP_FW_F_ICMPRPL 0x100 /* Send back icmp unreachable packet */
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#define IP_FW_F_IFNAME 0x200 /* Use interface name/unit (not IP) */
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#define IP_FW_F_MASK 0x3FF /* All possible flag bits mask */
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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 53
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#define IP_FW_ADD (IP_FW_BASE_CTL)
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#define IP_FW_DEL (IP_FW_BASE_CTL+4)
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#define IP_FW_FLUSH (IP_FW_BASE_CTL+6)
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#define IP_FW_POLICY (IP_FW_BASE_CTL+7)
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#define IP_ACCT_ADD (IP_FW_BASE_CTL+10)
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#define IP_ACCT_DEL (IP_FW_BASE_CTL+11)
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#define IP_ACCT_FLUSH (IP_FW_BASE_CTL+12)
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#define IP_ACCT_ZERO (IP_FW_BASE_CTL+13)
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#define IP_ACCT_CLR (IP_FW_BASE_CTL+14)
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/*
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* Policy flags...
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*/
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#define IP_FW_P_DENY 0x01
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#define IP_FW_P_ICMP 0x02
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#define IP_FW_P_MASK 0x03
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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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* Variables/chain.
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*/
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extern struct ip_fw *ip_fw_chain;
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extern u_short ip_fw_policy;
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extern struct ip_fw *ip_acct_chain;
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/*
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* Function pointers.
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*/
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extern int (*ip_fw_chk_ptr)(struct ip *,struct ifnet *,struct ip_fw *);
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extern int (*ip_fw_ctl_ptr)(int,struct mbuf *);
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extern void (*ip_acct_cnt_ptr)(struct ip *,struct ifnet *,struct ip_fw *,int);
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extern int (*ip_acct_ctl_ptr)(int,struct mbuf *);
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/*
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* Function definitions.
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*/
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int ip_fw_chk(struct ip *,struct ifnet *,struct ip_fw *);
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int ip_fw_ctl(int,struct mbuf *);
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void ip_acct_cnt(struct ip *,struct ifnet *,struct ip_fw *,int);
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int ip_acct_ctl(int,struct mbuf *);
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#endif /* KERNEL */
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#endif /* _IP_FW_H */
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