Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * 25-Jul-1998 Major changes to allow for ip chain table |
| 3 | * |
| 4 | * 3-Jan-2000 Named tables to allow packet selection for different uses. |
| 5 | */ |
| 6 | |
| 7 | /* |
| 8 | * Format of an IP firewall descriptor |
| 9 | * |
| 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. |
| 13 | */ |
| 14 | |
| 15 | #ifndef _IPTABLES_H |
| 16 | #define _IPTABLES_H |
| 17 | |
| 18 | #ifdef __KERNEL__ |
| 19 | #include <linux/if.h> |
| 20 | #include <linux/types.h> |
| 21 | #include <linux/in.h> |
| 22 | #include <linux/ip.h> |
| 23 | #include <linux/skbuff.h> |
| 24 | #endif |
| 25 | #include <linux/compiler.h> |
| 26 | #include <linux/netfilter_ipv4.h> |
| 27 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 28 | #include <linux/netfilter/x_tables.h> |
| 29 | |
| 30 | #define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN |
| 31 | #define IPT_TABLE_MAXNAMELEN XT_FUNCTION_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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | /* Yes, Virginia, you have to zero the padding. */ |
| 38 | struct ipt_ip { |
| 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]; |
| 45 | |
| 46 | /* Protocol, 0 = ANY */ |
| 47 | u_int16_t proto; |
| 48 | |
| 49 | /* Flags word */ |
| 50 | u_int8_t flags; |
| 51 | /* Inverse flags */ |
| 52 | u_int8_t invflags; |
| 53 | }; |
| 54 | |
Dmitry Mishin | 1e30a01 | 2006-03-22 13:56:56 -0800 | [diff] [blame] | 55 | #define ipt_entry_match xt_entry_match |
| 56 | #define ipt_entry_target xt_entry_target |
| 57 | #define ipt_standard_target xt_standard_target |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 59 | #define ipt_counters xt_counters |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
| 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 */ |
Patrick McHardy | 0546534 | 2005-08-21 23:31:43 -0700 | [diff] [blame] | 63 | #define IPT_F_GOTO 0x02 /* Set if jump is a goto */ |
| 64 | #define IPT_F_MASK 0x03 /* All possible flag bits mask. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
| 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. */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 73 | #define IPT_INV_PROTO XT_INV_PROTO |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | #define IPT_INV_MASK 0x7F /* All possible flag bits mask. */ |
| 75 | |
| 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 */ |
| 79 | struct ipt_entry |
| 80 | { |
| 81 | struct ipt_ip ip; |
| 82 | |
| 83 | /* Mark with fields that we care about. */ |
| 84 | unsigned int nfcache; |
| 85 | |
| 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; |
| 90 | |
| 91 | /* Back pointer */ |
| 92 | unsigned int comefrom; |
| 93 | |
| 94 | /* Packet and byte counters. */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 95 | struct xt_counters counters; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
| 97 | /* The matches (if any), then the target. */ |
| 98 | unsigned char elems[0]; |
| 99 | }; |
| 100 | |
| 101 | /* |
| 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. */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 105 | #define IPT_BASE_CTL XT_BASE_CTL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 107 | #define IPT_SO_SET_REPLACE XT_SO_SET_REPLACE |
| 108 | #define IPT_SO_SET_ADD_COUNTERS XT_SO_SET_ADD_COUNTERS |
| 109 | #define IPT_SO_SET_MAX XT_SO_SET_MAX |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 111 | #define IPT_SO_GET_INFO XT_SO_GET_INFO |
| 112 | #define IPT_SO_GET_ENTRIES XT_SO_GET_ENTRIES |
| 113 | #define IPT_SO_GET_REVISION_MATCH XT_SO_GET_REVISION_MATCH |
| 114 | #define IPT_SO_GET_REVISION_TARGET XT_SO_GET_REVISION_TARGET |
| 115 | #define IPT_SO_GET_MAX XT_SO_GET_REVISION_TARGET |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 117 | #define IPT_CONTINUE XT_CONTINUE |
| 118 | #define IPT_RETURN XT_RETURN |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 120 | #include <linux/netfilter/xt_tcpudp.h> |
| 121 | #define ipt_udp xt_udp |
| 122 | #define ipt_tcp xt_tcp |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 124 | #define IPT_TCP_INV_SRCPT XT_TCP_INV_SRCPT |
| 125 | #define IPT_TCP_INV_DSTPT XT_TCP_INV_DSTPT |
| 126 | #define IPT_TCP_INV_FLAGS XT_TCP_INV_FLAGS |
| 127 | #define IPT_TCP_INV_OPTION XT_TCP_INV_OPTION |
| 128 | #define IPT_TCP_INV_MASK XT_TCP_INV_MASK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 130 | #define IPT_UDP_INV_SRCPT XT_UDP_INV_SRCPT |
| 131 | #define IPT_UDP_INV_DSTPT XT_UDP_INV_DSTPT |
| 132 | #define IPT_UDP_INV_MASK XT_UDP_INV_MASK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
| 134 | /* ICMP matching stuff */ |
| 135 | struct ipt_icmp |
| 136 | { |
| 137 | u_int8_t type; /* type to match */ |
| 138 | u_int8_t code[2]; /* range of code */ |
| 139 | u_int8_t invflags; /* Inverse flags */ |
| 140 | }; |
| 141 | |
| 142 | /* Values for "inv" field for struct ipt_icmp. */ |
| 143 | #define IPT_ICMP_INV 0x01 /* Invert the sense of type/code test */ |
| 144 | |
| 145 | /* The argument to IPT_SO_GET_INFO */ |
| 146 | struct ipt_getinfo |
| 147 | { |
| 148 | /* Which table: caller fills this in. */ |
| 149 | char name[IPT_TABLE_MAXNAMELEN]; |
| 150 | |
| 151 | /* Kernel fills these in. */ |
| 152 | /* Which hook entry points are valid: bitmask */ |
| 153 | unsigned int valid_hooks; |
| 154 | |
| 155 | /* Hook entry points: one per netfilter hook. */ |
| 156 | unsigned int hook_entry[NF_IP_NUMHOOKS]; |
| 157 | |
| 158 | /* Underflow points. */ |
| 159 | unsigned int underflow[NF_IP_NUMHOOKS]; |
| 160 | |
| 161 | /* Number of entries */ |
| 162 | unsigned int num_entries; |
| 163 | |
| 164 | /* Size of entries. */ |
| 165 | unsigned int size; |
| 166 | }; |
| 167 | |
| 168 | /* The argument to IPT_SO_SET_REPLACE. */ |
| 169 | struct ipt_replace |
| 170 | { |
| 171 | /* Which table. */ |
| 172 | char name[IPT_TABLE_MAXNAMELEN]; |
| 173 | |
| 174 | /* Which hook entry points are valid: bitmask. You can't |
| 175 | change this. */ |
| 176 | unsigned int valid_hooks; |
| 177 | |
| 178 | /* Number of entries */ |
| 179 | unsigned int num_entries; |
| 180 | |
| 181 | /* Total size of new entries */ |
| 182 | unsigned int size; |
| 183 | |
| 184 | /* Hook entry points. */ |
| 185 | unsigned int hook_entry[NF_IP_NUMHOOKS]; |
| 186 | |
| 187 | /* Underflow points. */ |
| 188 | unsigned int underflow[NF_IP_NUMHOOKS]; |
| 189 | |
| 190 | /* Information about old entries: */ |
| 191 | /* Number of counters (must be equal to current number of entries). */ |
| 192 | unsigned int num_counters; |
| 193 | /* The old entries' counters. */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 194 | struct xt_counters __user *counters; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | |
| 196 | /* The entries (hang off end: not really an array). */ |
| 197 | struct ipt_entry entries[0]; |
| 198 | }; |
| 199 | |
| 200 | /* The argument to IPT_SO_ADD_COUNTERS. */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 201 | #define ipt_counters_info xt_counters_info |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
| 203 | /* The argument to IPT_SO_GET_ENTRIES. */ |
| 204 | struct ipt_get_entries |
| 205 | { |
| 206 | /* Which table: user fills this in. */ |
| 207 | char name[IPT_TABLE_MAXNAMELEN]; |
| 208 | |
| 209 | /* User fills this in: total entry size. */ |
| 210 | unsigned int size; |
| 211 | |
| 212 | /* The entries. */ |
| 213 | struct ipt_entry entrytable[0]; |
| 214 | }; |
| 215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | /* Standard return verdict, or do jump. */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 217 | #define IPT_STANDARD_TARGET XT_STANDARD_TARGET |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | /* Error verdict. */ |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 219 | #define IPT_ERROR_TARGET XT_ERROR_TARGET |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | |
| 221 | /* Helper functions */ |
| 222 | static __inline__ struct ipt_entry_target * |
| 223 | ipt_get_target(struct ipt_entry *e) |
| 224 | { |
| 225 | return (void *)e + e->target_offset; |
| 226 | } |
| 227 | |
| 228 | /* fn returns 0 to continue iteration */ |
| 229 | #define IPT_MATCH_ITERATE(e, fn, args...) \ |
| 230 | ({ \ |
| 231 | unsigned int __i; \ |
| 232 | int __ret = 0; \ |
| 233 | struct ipt_entry_match *__match; \ |
| 234 | \ |
| 235 | for (__i = sizeof(struct ipt_entry); \ |
| 236 | __i < (e)->target_offset; \ |
| 237 | __i += __match->u.match_size) { \ |
| 238 | __match = (void *)(e) + __i; \ |
| 239 | \ |
| 240 | __ret = fn(__match , ## args); \ |
| 241 | if (__ret != 0) \ |
| 242 | break; \ |
| 243 | } \ |
| 244 | __ret; \ |
| 245 | }) |
| 246 | |
| 247 | /* fn returns 0 to continue iteration */ |
| 248 | #define IPT_ENTRY_ITERATE(entries, size, fn, args...) \ |
| 249 | ({ \ |
| 250 | unsigned int __i; \ |
| 251 | int __ret = 0; \ |
| 252 | struct ipt_entry *__entry; \ |
| 253 | \ |
| 254 | for (__i = 0; __i < (size); __i += __entry->next_offset) { \ |
| 255 | __entry = (void *)(entries) + __i; \ |
| 256 | \ |
| 257 | __ret = fn(__entry , ## args); \ |
| 258 | if (__ret != 0) \ |
| 259 | break; \ |
| 260 | } \ |
| 261 | __ret; \ |
| 262 | }) |
| 263 | |
| 264 | /* |
| 265 | * Main firewall chains definitions and global var's definitions. |
| 266 | */ |
| 267 | #ifdef __KERNEL__ |
| 268 | |
| 269 | #include <linux/init.h> |
| 270 | extern void ipt_init(void) __init; |
| 271 | |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 272 | #define ipt_register_target(tgt) \ |
| 273 | ({ (tgt)->family = AF_INET; \ |
| 274 | xt_register_target(tgt); }) |
| 275 | #define ipt_unregister_target(tgt) xt_unregister_target(tgt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | |
Pablo Neira Ayuso | a45049c | 2006-03-22 13:55:40 -0800 | [diff] [blame] | 277 | #define ipt_register_match(mtch) \ |
| 278 | ({ (mtch)->family = AF_INET; \ |
| 279 | xt_register_match(mtch); }) |
| 280 | #define ipt_unregister_match(mtch) xt_unregister_match(mtch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 282 | //#define ipt_register_table(tbl, repl) xt_register_table(AF_INET, tbl, repl) |
| 283 | //#define ipt_unregister_table(tbl) xt_unregister_table(AF_INET, tbl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 285 | extern int ipt_register_table(struct ipt_table *table, |
| 286 | const struct ipt_replace *repl); |
| 287 | extern void ipt_unregister_table(struct ipt_table *table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
| 289 | /* net/sched/ipt.c: Gimme access to your targets! Gets target->me. */ |
| 290 | extern struct ipt_target *ipt_find_target(const char *name, u8 revision); |
| 291 | |
| 292 | /* Standard entry. */ |
| 293 | struct ipt_standard |
| 294 | { |
| 295 | struct ipt_entry entry; |
| 296 | struct ipt_standard_target target; |
| 297 | }; |
| 298 | |
| 299 | struct ipt_error_target |
| 300 | { |
| 301 | struct ipt_entry_target target; |
| 302 | char errorname[IPT_FUNCTION_MAXNAMELEN]; |
| 303 | }; |
| 304 | |
| 305 | struct ipt_error |
| 306 | { |
| 307 | struct ipt_entry entry; |
| 308 | struct ipt_error_target target; |
| 309 | }; |
| 310 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | extern unsigned int ipt_do_table(struct sk_buff **pskb, |
| 312 | unsigned int hook, |
| 313 | const struct net_device *in, |
| 314 | const struct net_device *out, |
| 315 | struct ipt_table *table, |
| 316 | void *userdata); |
| 317 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 318 | #define IPT_ALIGN(s) XT_ALIGN(s) |
Dmitry Mishin | 2722971 | 2006-04-01 02:25:19 -0800 | [diff] [blame] | 319 | |
| 320 | #ifdef CONFIG_COMPAT |
| 321 | #include <net/compat.h> |
| 322 | |
| 323 | struct compat_ipt_entry |
| 324 | { |
| 325 | struct ipt_ip ip; |
| 326 | compat_uint_t nfcache; |
| 327 | u_int16_t target_offset; |
| 328 | u_int16_t next_offset; |
| 329 | compat_uint_t comefrom; |
| 330 | struct compat_xt_counters counters; |
| 331 | unsigned char elems[0]; |
| 332 | }; |
| 333 | |
| 334 | #define COMPAT_IPT_ALIGN(s) COMPAT_XT_ALIGN(s) |
| 335 | |
| 336 | #endif /* CONFIG_COMPAT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | #endif /*__KERNEL__*/ |
| 338 | #endif /* _IPTABLES_H */ |