2 * 25-Jul-1998 Major changes to allow for ip chain table
4 * 3-Jan-2000 Named tables to allow packet selection for different uses.
8 * Format of an IP firewall descriptor
10 * src, dst, src_mask, dst_mask are always stored in network byte order.
11 * flags are stored in host byte order (of course).
12 * Port numbers are stored in HOST byte order.
20 #include <linux/types.h>
23 #include <linux/skbuff.h>
25 #include <linux/compiler.h>
26 #include <linux/netfilter_ipv4.h>
28 #include <linux/netfilter/x_tables.h>
30 #define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
31 #define IPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
32 #define ipt_match xt_match
33 #define ipt_target xt_target
34 #define ipt_table xt_table
35 #define ipt_get_revision xt_get_revision
37 /* Yes, Virginia, you have to zero the padding. */
39 /* Source and destination IP addr */
40 struct in_addr src, dst;
41 /* Mask for src and dest IP addr */
42 struct in_addr smsk, dmsk;
43 char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
44 unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
46 /* Protocol, 0 = ANY */
55 #define ipt_entry_match xt_entry_match
56 #define ipt_entry_target xt_entry_target
57 #define ipt_standard_target xt_standard_target
59 #define ipt_counters xt_counters
61 /* Values for "flag" field in struct ipt_ip (general ip structure). */
62 #define IPT_F_FRAG 0x01 /* Set if rule is a fragment rule */
63 #define IPT_F_GOTO 0x02 /* Set if jump is a goto */
64 #define IPT_F_MASK 0x03 /* All possible flag bits mask. */
66 /* Values for "inv" field in struct ipt_ip. */
67 #define IPT_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
68 #define IPT_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */
69 #define IPT_INV_TOS 0x04 /* Invert the sense of TOS. */
70 #define IPT_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */
71 #define IPT_INV_DSTIP 0x10 /* Invert the sense of DST OP. */
72 #define IPT_INV_FRAG 0x20 /* Invert the sense of FRAG. */
73 #define IPT_INV_PROTO XT_INV_PROTO
74 #define IPT_INV_MASK 0x7F /* All possible flag bits mask. */
76 /* This structure defines each of the firewall rules. Consists of 3
77 parts which are 1) general IP header stuff 2) match specific
78 stuff 3) the target to perform if the rule matches */
83 /* Mark with fields that we care about. */
86 /* Size of ipt_entry + matches */
87 u_int16_t target_offset;
88 /* Size of ipt_entry + matches + target */
89 u_int16_t next_offset;
92 unsigned int comefrom;
94 /* Packet and byte counters. */
95 struct xt_counters counters;
97 /* The matches (if any), then the target. */
98 unsigned char elems[0];
102 * New IP firewall options for [gs]etsockopt at the RAW IP level.
103 * Unlike BSD Linux inherits IP options so you don't have to use a raw
104 * socket for this. Instead we check rights in the calls.
106 * ATTENTION: check linux/in.h before adding new number here.
108 #define IPT_BASE_CTL 64
110 #define IPT_SO_SET_REPLACE (IPT_BASE_CTL)
111 #define IPT_SO_SET_ADD_COUNTERS (IPT_BASE_CTL + 1)
112 #define IPT_SO_SET_MAX IPT_SO_SET_ADD_COUNTERS
114 #define IPT_SO_GET_INFO (IPT_BASE_CTL)
115 #define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1)
116 #define IPT_SO_GET_REVISION_MATCH (IPT_BASE_CTL + 2)
117 #define IPT_SO_GET_REVISION_TARGET (IPT_BASE_CTL + 3)
118 #define IPT_SO_GET_MAX IPT_SO_GET_REVISION_TARGET
120 #define IPT_CONTINUE XT_CONTINUE
121 #define IPT_RETURN XT_RETURN
123 #include <linux/netfilter/xt_tcpudp.h>
124 #define ipt_udp xt_udp
125 #define ipt_tcp xt_tcp
127 #define IPT_TCP_INV_SRCPT XT_TCP_INV_SRCPT
128 #define IPT_TCP_INV_DSTPT XT_TCP_INV_DSTPT
129 #define IPT_TCP_INV_FLAGS XT_TCP_INV_FLAGS
130 #define IPT_TCP_INV_OPTION XT_TCP_INV_OPTION
131 #define IPT_TCP_INV_MASK XT_TCP_INV_MASK
133 #define IPT_UDP_INV_SRCPT XT_UDP_INV_SRCPT
134 #define IPT_UDP_INV_DSTPT XT_UDP_INV_DSTPT
135 #define IPT_UDP_INV_MASK XT_UDP_INV_MASK
137 /* ICMP matching stuff */
140 u_int8_t type; /* type to match */
141 u_int8_t code[2]; /* range of code */
142 u_int8_t invflags; /* Inverse flags */
145 /* Values for "inv" field for struct ipt_icmp. */
146 #define IPT_ICMP_INV 0x01 /* Invert the sense of type/code test */
148 /* The argument to IPT_SO_GET_INFO */
151 /* Which table: caller fills this in. */
152 char name[IPT_TABLE_MAXNAMELEN];
154 /* Kernel fills these in. */
155 /* Which hook entry points are valid: bitmask */
156 unsigned int valid_hooks;
158 /* Hook entry points: one per netfilter hook. */
159 unsigned int hook_entry[NF_IP_NUMHOOKS];
161 /* Underflow points. */
162 unsigned int underflow[NF_IP_NUMHOOKS];
164 /* Number of entries */
165 unsigned int num_entries;
167 /* Size of entries. */
171 /* The argument to IPT_SO_SET_REPLACE. */
175 char name[IPT_TABLE_MAXNAMELEN];
177 /* Which hook entry points are valid: bitmask. You can't
179 unsigned int valid_hooks;
181 /* Number of entries */
182 unsigned int num_entries;
184 /* Total size of new entries */
187 /* Hook entry points. */
188 unsigned int hook_entry[NF_IP_NUMHOOKS];
190 /* Underflow points. */
191 unsigned int underflow[NF_IP_NUMHOOKS];
193 /* Information about old entries: */
194 /* Number of counters (must be equal to current number of entries). */
195 unsigned int num_counters;
196 /* The old entries' counters. */
197 struct xt_counters __user *counters;
199 /* The entries (hang off end: not really an array). */
200 struct ipt_entry entries[0];
203 /* The argument to IPT_SO_ADD_COUNTERS. */
204 #define ipt_counters_info xt_counters_info
206 /* The argument to IPT_SO_GET_ENTRIES. */
207 struct ipt_get_entries
209 /* Which table: user fills this in. */
210 char name[IPT_TABLE_MAXNAMELEN];
212 /* User fills this in: total entry size. */
216 struct ipt_entry entrytable[0];
219 /* Standard return verdict, or do jump. */
220 #define IPT_STANDARD_TARGET XT_STANDARD_TARGET
222 #define IPT_ERROR_TARGET XT_ERROR_TARGET
224 /* Helper functions */
225 static __inline__ struct ipt_entry_target *
226 ipt_get_target(struct ipt_entry *e)
228 return (void *)e + e->target_offset;
231 /* fn returns 0 to continue iteration */
232 #define IPT_MATCH_ITERATE(e, fn, args...) \
236 struct ipt_entry_match *__match; \
238 for (__i = sizeof(struct ipt_entry); \
239 __i < (e)->target_offset; \
240 __i += __match->u.match_size) { \
241 __match = (void *)(e) + __i; \
243 __ret = fn(__match , ## args); \
250 /* fn returns 0 to continue iteration */
251 #define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
255 struct ipt_entry *__entry; \
257 for (__i = 0; __i < (size); __i += __entry->next_offset) { \
258 __entry = (void *)(entries) + __i; \
260 __ret = fn(__entry , ## args); \
268 * Main firewall chains definitions and global var's definitions.
272 #include <linux/init.h>
273 extern void ipt_init(void) __init;
275 extern int ipt_register_table(struct xt_table *table,
276 const struct ipt_replace *repl);
277 extern void ipt_unregister_table(struct xt_table *table);
279 /* Standard entry. */
282 struct ipt_entry entry;
283 struct ipt_standard_target target;
286 struct ipt_error_target
288 struct ipt_entry_target target;
289 char errorname[IPT_FUNCTION_MAXNAMELEN];
294 struct ipt_entry entry;
295 struct ipt_error_target target;
298 #define IPT_ENTRY_INIT(__size) \
300 .target_offset = sizeof(struct ipt_entry), \
301 .next_offset = (__size), \
304 #define IPT_STANDARD_INIT(__verdict) \
306 .entry = IPT_ENTRY_INIT(sizeof(struct ipt_standard)), \
307 .target = XT_TARGET_INIT(IPT_STANDARD_TARGET, \
308 sizeof(struct xt_standard_target)), \
309 .target.verdict = -(__verdict) - 1, \
312 #define IPT_ERROR_INIT \
314 .entry = IPT_ENTRY_INIT(sizeof(struct ipt_error)), \
315 .target = XT_TARGET_INIT(IPT_ERROR_TARGET, \
316 sizeof(struct ipt_error_target)), \
317 .target.errorname = "ERROR", \
320 extern unsigned int ipt_do_table(struct sk_buff **pskb,
322 const struct net_device *in,
323 const struct net_device *out,
324 struct xt_table *table);
326 #define IPT_ALIGN(s) XT_ALIGN(s)
329 #include <net/compat.h>
331 struct compat_ipt_entry
334 compat_uint_t nfcache;
335 u_int16_t target_offset;
336 u_int16_t next_offset;
337 compat_uint_t comefrom;
338 struct compat_xt_counters counters;
339 unsigned char elems[0];
342 #define COMPAT_IPT_ALIGN(s) COMPAT_XT_ALIGN(s)
344 #endif /* CONFIG_COMPAT */
345 #endif /*__KERNEL__*/
346 #endif /* _IPTABLES_H */