| #ifndef _IPFWADM_CORE_H |
| #define _IPFWADM_CORE_H |
| /* Minor modifications to fit on compatibility framework: |
| Rusty.Russell@rustcorp.com.au |
| */ |
| |
| /* |
| * IP firewalling code. This is taken from 4.4BSD. Please note the |
| * copyright message below. As per the GPL it must be maintained |
| * and the licenses thus do not conflict. While this port is subject |
| * to the GPL I also place my modifications under the original |
| * license in recognition of the original copyright. |
| * |
| * Ported from BSD to Linux, |
| * Alan Cox 22/Nov/1994. |
| * Merged and included the FreeBSD-Current changes at Ugen's request |
| * (but hey it's a lot cleaner now). Ugen would prefer in some ways |
| * we waited for his final product but since Linux 1.2.0 is about to |
| * appear it's not practical - Read: It works, it's not clean but please |
| * don't consider it to be his standard of finished work. |
| * Alan. |
| * |
| * Fixes: |
| * Pauline Middelink : Added masquerading. |
| * Jos Vos : Separate input and output firewall |
| * chains, new "insert" and "append" |
| * commands to replace "add" commands, |
| * add ICMP header to struct ip_fwpkt. |
| * Jos Vos : Add support for matching device names. |
| * Willy Konynenberg : Add transparent proxying support. |
| * Jos Vos : Add options for input/output accounting. |
| * |
| * All the real work was done by ..... |
| */ |
| |
| /* |
| * 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. |
| */ |
| |
| #ifdef __KERNEL__ |
| #include <linux/icmp.h> |
| #include <linux/in.h> |
| #include <linux/ip.h> |
| #include <linux/tcp.h> |
| #include <linux/udp.h> |
| #endif |
| |
| 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" */ |
| struct net_device *fw_viadev; /* device of interface "via" */ |
| __u16 fw_flg; /* Flags word */ |
| __u16 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 */ |
| __u16 fw_pts[IP_FW_MAX_PORTS]; /* Array of port numbers to match */ |
| unsigned long fw_pcnt,fw_bcnt; /* Packet and byte counters */ |
| __u8 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_MASQ 5 |
| |
| #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)) |
| |
| #define IP_FW_MASQ_INSERT (IP_FW_INSERT | (IP_FW_MASQ << IP_FW_SHIFT)) |
| #define IP_FW_MASQ_ADD (IP_FW_APPEND | (IP_FW_MASQ << IP_FW_SHIFT)) |
| #define IP_FW_MASQ_DEL (IP_FW_DELETE | (IP_FW_MASQ << IP_FW_SHIFT)) |
| #define IP_FW_MASQ_FLUSH (IP_FW_FLUSH | (IP_FW_MASQ << IP_FW_SHIFT)) |
| |
| #define IP_FW_MASQ_INSERT (IP_FW_INSERT | (IP_FW_MASQ << IP_FW_SHIFT)) |
| #define IP_FW_MASQ_ADD (IP_FW_APPEND | (IP_FW_MASQ << IP_FW_SHIFT)) |
| #define IP_FW_MASQ_DEL (IP_FW_DELETE | (IP_FW_MASQ << IP_FW_SHIFT)) |
| #define IP_FW_MASQ_FLUSH (IP_FW_FLUSH | (IP_FW_MASQ << 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 */ |
| }; |
| |
| #define IP_FW_MASQCTL_MAX 256 |
| #define IP_MASQ_MOD_NMAX 32 |
| |
| struct ip_fw_masqctl |
| { |
| int mctl_action; |
| union { |
| struct { |
| char name[IP_MASQ_MOD_NMAX]; |
| char data[1]; |
| } mod; |
| } u; |
| }; |
| |
| /* |
| * timeouts for ip masquerading |
| */ |
| |
| struct ip_fw_masq; |
| |
| /* |
| * Main firewall chains definitions and global var's definitions. |
| */ |
| |
| #ifdef __KERNEL__ |
| |
| /* Modes used in the ip_fw_chk() routine. */ |
| #define IP_FW_MODE_FW 0x00 /* kernel firewall check */ |
| #define IP_FW_MODE_ACCT_IN 0x01 /* accounting (incoming) */ |
| #define IP_FW_MODE_ACCT_OUT 0x02 /* accounting (outgoing) */ |
| #define IP_FW_MODE_CHK 0x04 /* check requested by user */ |
| |
| #include <linux/config.h> |
| #ifdef CONFIG_IP_FIREWALL |
| extern struct ip_fw *ip_fw_in_chain; |
| extern struct ip_fw *ip_fw_out_chain; |
| extern struct ip_fw *ip_fw_fwd_chain; |
| extern int ip_fw_in_policy; |
| extern int ip_fw_out_policy; |
| extern int ip_fw_fwd_policy; |
| extern int ip_fw_ctl(int, void *, int); |
| #endif |
| #ifdef CONFIG_IP_ACCT |
| extern struct ip_fw *ip_acct_chain; |
| extern int ip_acct_ctl(int, void *, int); |
| #endif |
| #ifdef CONFIG_IP_MASQUERADE |
| extern int ip_masq_ctl(int, void *, int); |
| #endif |
| #ifdef CONFIG_IP_MASQUERADE |
| extern int ip_masq_ctl(int, void *, int); |
| #endif |
| |
| extern int ip_fw_masq_timeouts(void *user, int len); |
| |
| extern int ip_fw_chk(struct iphdr *, struct net_device *, __u16 *, |
| struct ip_fw *, int, int); |
| #endif /* KERNEL */ |
| #endif /* _IP_FW_H */ |