1 #ifndef _IPFWADM_CORE_H
2 #define _IPFWADM_CORE_H
3 /* Minor modifications to fit on compatibility framework:
4 Rusty.Russell@rustcorp.com.au
8 * IP firewalling code. This is taken from 4.4BSD. Please note the
9 * copyright message below. As per the GPL it must be maintained
10 * and the licenses thus do not conflict. While this port is subject
11 * to the GPL I also place my modifications under the original
12 * license in recognition of the original copyright.
14 * Ported from BSD to Linux,
15 * Alan Cox 22/Nov/1994.
16 * Merged and included the FreeBSD-Current changes at Ugen's request
17 * (but hey it's a lot cleaner now). Ugen would prefer in some ways
18 * we waited for his final product but since Linux 1.2.0 is about to
19 * appear it's not practical - Read: It works, it's not clean but please
20 * don't consider it to be his standard of finished work.
24 * Pauline Middelink : Added masquerading.
25 * Jos Vos : Separate input and output firewall
26 * chains, new "insert" and "append"
27 * commands to replace "add" commands,
28 * add ICMP header to struct ip_fwpkt.
29 * Jos Vos : Add support for matching device names.
30 * Willy Konynenberg : Add transparent proxying support.
31 * Jos Vos : Add options for input/output accounting.
33 * All the real work was done by .....
37 * Copyright (c) 1993 Daniel Boulet
38 * Copyright (c) 1994 Ugen J.S.Antsilevich
40 * Redistribution and use in source forms, with and without modification,
41 * are permitted provided that this entire comment appears intact.
43 * Redistribution in binary form may occur without any restrictions.
44 * Obviously, it would be nice if you gave credit where credit is due
45 * but requiring it would be too onerous.
47 * This software is provided ``AS IS'' without any warranties of any kind.
51 * Format of an IP firewall descriptor
53 * src, dst, src_mask, dst_mask are always stored in network byte order.
54 * flags and num_*_ports are stored in host byte order (of course).
55 * Port numbers are stored in HOST byte order.
59 #include <linux/icmp.h>
62 #include <linux/tcp.h>
63 #include <linux/udp.h>
68 struct ip_fw *fw_next; /* Next firewall on chain */
69 struct in_addr fw_src, fw_dst; /* Source and destination IP addr */
70 struct in_addr fw_smsk, fw_dmsk; /* Mask for src and dest IP addr */
71 struct in_addr fw_via; /* IP address of interface "via" */
72 struct net_device *fw_viadev; /* device of interface "via" */
73 __u16 fw_flg; /* Flags word */
74 __u16 fw_nsp, fw_ndp; /* N'of src ports and # of dst ports */
75 /* in ports array (dst ports follow */
76 /* src ports; max of 10 ports in all; */
77 /* count of 0 means match all ports) */
78 #define IP_FW_MAX_PORTS 10 /* A reasonable maximum */
79 __u16 fw_pts[IP_FW_MAX_PORTS]; /* Array of port numbers to match */
80 unsigned long fw_pcnt,fw_bcnt; /* Packet and byte counters */
81 __u8 fw_tosand, fw_tosxor; /* Revised packet priority */
82 char fw_vianame[IFNAMSIZ]; /* name of interface "via" */
86 * Values for "flags" field .
89 #define IP_FW_F_ALL 0x0000 /* This is a universal packet firewall*/
90 #define IP_FW_F_TCP 0x0001 /* This is a TCP packet firewall */
91 #define IP_FW_F_UDP 0x0002 /* This is a UDP packet firewall */
92 #define IP_FW_F_ICMP 0x0003 /* This is a ICMP packet firewall */
93 #define IP_FW_F_KIND 0x0003 /* Mask to isolate firewall kind */
94 #define IP_FW_F_ACCEPT 0x0004 /* This is an accept firewall (as *
95 * opposed to a deny firewall)*
97 #define IP_FW_F_SRNG 0x0008 /* The first two src ports are a min *
98 * and max range (stored in host byte *
101 #define IP_FW_F_DRNG 0x0010 /* The first two dst ports are a min *
102 * and max range (stored in host byte *
104 * (ports[0] <= port <= ports[1]) *
106 #define IP_FW_F_PRN 0x0020 /* In verbose mode print this firewall*/
107 #define IP_FW_F_BIDIR 0x0040 /* For bidirectional firewalls */
108 #define IP_FW_F_TCPSYN 0x0080 /* For tcp packets-check SYN only */
109 #define IP_FW_F_ICMPRPL 0x0100 /* Send back icmp unreachable packet */
110 #define IP_FW_F_MASQ 0x0200 /* Masquerading */
111 #define IP_FW_F_TCPACK 0x0400 /* For tcp-packets match if ACK is set*/
112 #define IP_FW_F_REDIR 0x0800 /* Redirect to local port fw_pts[n] */
113 #define IP_FW_F_ACCTIN 0x1000 /* Account incoming packets only. */
114 #define IP_FW_F_ACCTOUT 0x2000 /* Account outgoing packets only. */
116 #define IP_FW_F_MASK 0x3FFF /* All possible flag bits mask */
119 * New IP firewall options for [gs]etsockopt at the RAW IP level.
120 * Unlike BSD Linux inherits IP options so you don't have to use
121 * a raw socket for this. Instead we check rights in the calls.
124 #define IP_FW_BASE_CTL 64 /* base for firewall socket options */
126 #define IP_FW_COMMAND 0x00FF /* mask for command without chain */
127 #define IP_FW_TYPE 0x0300 /* mask for type (chain) */
128 #define IP_FW_SHIFT 8 /* shift count for type (chain) */
134 #define IP_FW_CHAINS 4 /* total number of ip_fw chains */
137 #define IP_FW_INSERT (IP_FW_BASE_CTL)
138 #define IP_FW_APPEND (IP_FW_BASE_CTL+1)
139 #define IP_FW_DELETE (IP_FW_BASE_CTL+2)
140 #define IP_FW_FLUSH (IP_FW_BASE_CTL+3)
141 #define IP_FW_ZERO (IP_FW_BASE_CTL+4)
142 #define IP_FW_POLICY (IP_FW_BASE_CTL+5)
143 #define IP_FW_CHECK (IP_FW_BASE_CTL+6)
144 #define IP_FW_MASQ_TIMEOUTS (IP_FW_BASE_CTL+7)
146 #define IP_FW_INSERT_FWD (IP_FW_INSERT | (IP_FW_FWD << IP_FW_SHIFT))
147 #define IP_FW_APPEND_FWD (IP_FW_APPEND | (IP_FW_FWD << IP_FW_SHIFT))
148 #define IP_FW_DELETE_FWD (IP_FW_DELETE | (IP_FW_FWD << IP_FW_SHIFT))
149 #define IP_FW_FLUSH_FWD (IP_FW_FLUSH | (IP_FW_FWD << IP_FW_SHIFT))
150 #define IP_FW_ZERO_FWD (IP_FW_ZERO | (IP_FW_FWD << IP_FW_SHIFT))
151 #define IP_FW_POLICY_FWD (IP_FW_POLICY | (IP_FW_FWD << IP_FW_SHIFT))
152 #define IP_FW_CHECK_FWD (IP_FW_CHECK | (IP_FW_FWD << IP_FW_SHIFT))
154 #define IP_FW_INSERT_IN (IP_FW_INSERT | (IP_FW_IN << IP_FW_SHIFT))
155 #define IP_FW_APPEND_IN (IP_FW_APPEND | (IP_FW_IN << IP_FW_SHIFT))
156 #define IP_FW_DELETE_IN (IP_FW_DELETE | (IP_FW_IN << IP_FW_SHIFT))
157 #define IP_FW_FLUSH_IN (IP_FW_FLUSH | (IP_FW_IN << IP_FW_SHIFT))
158 #define IP_FW_ZERO_IN (IP_FW_ZERO | (IP_FW_IN << IP_FW_SHIFT))
159 #define IP_FW_POLICY_IN (IP_FW_POLICY | (IP_FW_IN << IP_FW_SHIFT))
160 #define IP_FW_CHECK_IN (IP_FW_CHECK | (IP_FW_IN << IP_FW_SHIFT))
162 #define IP_FW_INSERT_OUT (IP_FW_INSERT | (IP_FW_OUT << IP_FW_SHIFT))
163 #define IP_FW_APPEND_OUT (IP_FW_APPEND | (IP_FW_OUT << IP_FW_SHIFT))
164 #define IP_FW_DELETE_OUT (IP_FW_DELETE | (IP_FW_OUT << IP_FW_SHIFT))
165 #define IP_FW_FLUSH_OUT (IP_FW_FLUSH | (IP_FW_OUT << IP_FW_SHIFT))
166 #define IP_FW_ZERO_OUT (IP_FW_ZERO | (IP_FW_OUT << IP_FW_SHIFT))
167 #define IP_FW_POLICY_OUT (IP_FW_POLICY | (IP_FW_OUT << IP_FW_SHIFT))
168 #define IP_FW_CHECK_OUT (IP_FW_CHECK | (IP_FW_OUT << IP_FW_SHIFT))
170 #define IP_ACCT_INSERT (IP_FW_INSERT | (IP_FW_ACCT << IP_FW_SHIFT))
171 #define IP_ACCT_APPEND (IP_FW_APPEND | (IP_FW_ACCT << IP_FW_SHIFT))
172 #define IP_ACCT_DELETE (IP_FW_DELETE | (IP_FW_ACCT << IP_FW_SHIFT))
173 #define IP_ACCT_FLUSH (IP_FW_FLUSH | (IP_FW_ACCT << IP_FW_SHIFT))
174 #define IP_ACCT_ZERO (IP_FW_ZERO | (IP_FW_ACCT << IP_FW_SHIFT))
176 #define IP_FW_MASQ_INSERT (IP_FW_INSERT | (IP_FW_MASQ << IP_FW_SHIFT))
177 #define IP_FW_MASQ_ADD (IP_FW_APPEND | (IP_FW_MASQ << IP_FW_SHIFT))
178 #define IP_FW_MASQ_DEL (IP_FW_DELETE | (IP_FW_MASQ << IP_FW_SHIFT))
179 #define IP_FW_MASQ_FLUSH (IP_FW_FLUSH | (IP_FW_MASQ << IP_FW_SHIFT))
181 #define IP_FW_MASQ_INSERT (IP_FW_INSERT | (IP_FW_MASQ << IP_FW_SHIFT))
182 #define IP_FW_MASQ_ADD (IP_FW_APPEND | (IP_FW_MASQ << IP_FW_SHIFT))
183 #define IP_FW_MASQ_DEL (IP_FW_DELETE | (IP_FW_MASQ << IP_FW_SHIFT))
184 #define IP_FW_MASQ_FLUSH (IP_FW_FLUSH | (IP_FW_MASQ << IP_FW_SHIFT))
188 struct iphdr fwp_iph; /* IP header */
190 struct tcphdr fwp_tcph; /* TCP header or */
191 struct udphdr fwp_udph; /* UDP header */
192 struct icmphdr fwp_icmph; /* ICMP header */
194 struct in_addr fwp_via; /* interface address */
195 char fwp_vianame[IFNAMSIZ]; /* interface name */
198 #define IP_FW_MASQCTL_MAX 256
199 #define IP_MASQ_MOD_NMAX 32
206 char name[IP_MASQ_MOD_NMAX];
213 * timeouts for ip masquerading
219 * Main firewall chains definitions and global var's definitions.
224 /* Modes used in the ip_fw_chk() routine. */
225 #define IP_FW_MODE_FW 0x00 /* kernel firewall check */
226 #define IP_FW_MODE_ACCT_IN 0x01 /* accounting (incoming) */
227 #define IP_FW_MODE_ACCT_OUT 0x02 /* accounting (outgoing) */
228 #define IP_FW_MODE_CHK 0x04 /* check requested by user */
230 #include <linux/config.h>
231 #ifdef CONFIG_IP_FIREWALL
232 extern struct ip_fw *ip_fw_in_chain;
233 extern struct ip_fw *ip_fw_out_chain;
234 extern struct ip_fw *ip_fw_fwd_chain;
235 extern int ip_fw_in_policy;
236 extern int ip_fw_out_policy;
237 extern int ip_fw_fwd_policy;
238 extern int ip_fw_ctl(int, void *, int);
240 #ifdef CONFIG_IP_ACCT
241 extern struct ip_fw *ip_acct_chain;
242 extern int ip_acct_ctl(int, void *, int);
244 #ifdef CONFIG_IP_MASQUERADE
245 extern int ip_masq_ctl(int, void *, int);
247 #ifdef CONFIG_IP_MASQUERADE
248 extern int ip_masq_ctl(int, void *, int);
251 extern int ip_fw_masq_timeouts(void *user, int len);
253 extern int ip_fw_chk(struct sk_buff **, struct net_device *, __u16 *,
254 struct ip_fw *, int, int);
256 #endif /* _IP_FW_H */