Jozsef Kadlecsik | d956798 | 2011-02-01 15:56:00 +0100 | [diff] [blame] | 1 | /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu> |
| 2 | * Patrick Schaaf <bof@bof.de> |
| 3 | * Martin Josefsson <gandalf@wlug.westbo.se> |
| 4 | * Copyright (C) 2003-2011 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | /* Kernel module which implements the set match and SET target |
| 12 | * for netfilter/iptables. */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/skbuff.h> |
| 16 | #include <linux/version.h> |
| 17 | |
| 18 | #include <linux/netfilter/x_tables.h> |
| 19 | #include <linux/netfilter/xt_set.h> |
| 20 | |
| 21 | MODULE_LICENSE("GPL"); |
| 22 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); |
| 23 | MODULE_DESCRIPTION("Xtables: IP set match and target module"); |
| 24 | MODULE_ALIAS("xt_SET"); |
| 25 | MODULE_ALIAS("ipt_set"); |
| 26 | MODULE_ALIAS("ip6t_set"); |
| 27 | MODULE_ALIAS("ipt_SET"); |
| 28 | MODULE_ALIAS("ip6t_SET"); |
| 29 | |
| 30 | static inline int |
| 31 | match_set(ip_set_id_t index, const struct sk_buff *skb, |
| 32 | u8 pf, u8 dim, u8 flags, int inv) |
| 33 | { |
| 34 | if (ip_set_test(index, skb, pf, dim, flags)) |
| 35 | inv = !inv; |
| 36 | return inv; |
| 37 | } |
| 38 | |
| 39 | /* Revision 0 interface: backward compatible with netfilter/iptables */ |
| 40 | |
| 41 | static bool |
| 42 | set_match_v0(const struct sk_buff *skb, struct xt_action_param *par) |
| 43 | { |
| 44 | const struct xt_set_info_match_v0 *info = par->matchinfo; |
| 45 | |
| 46 | return match_set(info->match_set.index, skb, par->family, |
| 47 | info->match_set.u.compat.dim, |
| 48 | info->match_set.u.compat.flags, |
| 49 | info->match_set.u.compat.flags & IPSET_INV_MATCH); |
| 50 | } |
| 51 | |
| 52 | static void |
| 53 | compat_flags(struct xt_set_info_v0 *info) |
| 54 | { |
| 55 | u_int8_t i; |
| 56 | |
| 57 | /* Fill out compatibility data according to enum ip_set_kopt */ |
| 58 | info->u.compat.dim = IPSET_DIM_ZERO; |
| 59 | if (info->u.flags[0] & IPSET_MATCH_INV) |
| 60 | info->u.compat.flags |= IPSET_INV_MATCH; |
| 61 | for (i = 0; i < IPSET_DIM_MAX-1 && info->u.flags[i]; i++) { |
| 62 | info->u.compat.dim++; |
| 63 | if (info->u.flags[i] & IPSET_SRC) |
| 64 | info->u.compat.flags |= (1<<info->u.compat.dim); |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | static int |
| 69 | set_match_v0_checkentry(const struct xt_mtchk_param *par) |
| 70 | { |
| 71 | struct xt_set_info_match_v0 *info = par->matchinfo; |
| 72 | ip_set_id_t index; |
| 73 | |
| 74 | index = ip_set_nfnl_get_byindex(info->match_set.index); |
| 75 | |
| 76 | if (index == IPSET_INVALID_ID) { |
| 77 | pr_warning("Cannot find set indentified by id %u to match\n", |
| 78 | info->match_set.index); |
| 79 | return -ENOENT; |
| 80 | } |
| 81 | if (info->match_set.u.flags[IPSET_DIM_MAX-1] != 0) { |
| 82 | pr_warning("Protocol error: set match dimension " |
| 83 | "is over the limit!\n"); |
Jozsef Kadlecsik | eafbd3f | 2011-04-13 13:45:57 +0200 | [diff] [blame^] | 84 | ip_set_nfnl_put(info->match_set.index); |
Jozsef Kadlecsik | d956798 | 2011-02-01 15:56:00 +0100 | [diff] [blame] | 85 | return -ERANGE; |
| 86 | } |
| 87 | |
| 88 | /* Fill out compatibility data */ |
| 89 | compat_flags(&info->match_set); |
| 90 | |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | static void |
| 95 | set_match_v0_destroy(const struct xt_mtdtor_param *par) |
| 96 | { |
| 97 | struct xt_set_info_match_v0 *info = par->matchinfo; |
| 98 | |
| 99 | ip_set_nfnl_put(info->match_set.index); |
| 100 | } |
| 101 | |
| 102 | static unsigned int |
| 103 | set_target_v0(struct sk_buff *skb, const struct xt_action_param *par) |
| 104 | { |
| 105 | const struct xt_set_info_target_v0 *info = par->targinfo; |
| 106 | |
| 107 | if (info->add_set.index != IPSET_INVALID_ID) |
| 108 | ip_set_add(info->add_set.index, skb, par->family, |
| 109 | info->add_set.u.compat.dim, |
| 110 | info->add_set.u.compat.flags); |
| 111 | if (info->del_set.index != IPSET_INVALID_ID) |
| 112 | ip_set_del(info->del_set.index, skb, par->family, |
| 113 | info->del_set.u.compat.dim, |
| 114 | info->del_set.u.compat.flags); |
| 115 | |
| 116 | return XT_CONTINUE; |
| 117 | } |
| 118 | |
| 119 | static int |
| 120 | set_target_v0_checkentry(const struct xt_tgchk_param *par) |
| 121 | { |
| 122 | struct xt_set_info_target_v0 *info = par->targinfo; |
| 123 | ip_set_id_t index; |
| 124 | |
| 125 | if (info->add_set.index != IPSET_INVALID_ID) { |
| 126 | index = ip_set_nfnl_get_byindex(info->add_set.index); |
| 127 | if (index == IPSET_INVALID_ID) { |
| 128 | pr_warning("Cannot find add_set index %u as target\n", |
| 129 | info->add_set.index); |
| 130 | return -ENOENT; |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | if (info->del_set.index != IPSET_INVALID_ID) { |
| 135 | index = ip_set_nfnl_get_byindex(info->del_set.index); |
| 136 | if (index == IPSET_INVALID_ID) { |
| 137 | pr_warning("Cannot find del_set index %u as target\n", |
| 138 | info->del_set.index); |
Jozsef Kadlecsik | eafbd3f | 2011-04-13 13:45:57 +0200 | [diff] [blame^] | 139 | if (info->add_set.index != IPSET_INVALID_ID) |
| 140 | ip_set_nfnl_put(info->add_set.index); |
Jozsef Kadlecsik | d956798 | 2011-02-01 15:56:00 +0100 | [diff] [blame] | 141 | return -ENOENT; |
| 142 | } |
| 143 | } |
| 144 | if (info->add_set.u.flags[IPSET_DIM_MAX-1] != 0 || |
| 145 | info->del_set.u.flags[IPSET_DIM_MAX-1] != 0) { |
| 146 | pr_warning("Protocol error: SET target dimension " |
| 147 | "is over the limit!\n"); |
Jozsef Kadlecsik | eafbd3f | 2011-04-13 13:45:57 +0200 | [diff] [blame^] | 148 | if (info->add_set.index != IPSET_INVALID_ID) |
| 149 | ip_set_nfnl_put(info->add_set.index); |
| 150 | if (info->del_set.index != IPSET_INVALID_ID) |
| 151 | ip_set_nfnl_put(info->del_set.index); |
Jozsef Kadlecsik | d956798 | 2011-02-01 15:56:00 +0100 | [diff] [blame] | 152 | return -ERANGE; |
| 153 | } |
| 154 | |
| 155 | /* Fill out compatibility data */ |
| 156 | compat_flags(&info->add_set); |
| 157 | compat_flags(&info->del_set); |
| 158 | |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | static void |
| 163 | set_target_v0_destroy(const struct xt_tgdtor_param *par) |
| 164 | { |
| 165 | const struct xt_set_info_target_v0 *info = par->targinfo; |
| 166 | |
| 167 | if (info->add_set.index != IPSET_INVALID_ID) |
| 168 | ip_set_nfnl_put(info->add_set.index); |
| 169 | if (info->del_set.index != IPSET_INVALID_ID) |
| 170 | ip_set_nfnl_put(info->del_set.index); |
| 171 | } |
| 172 | |
| 173 | /* Revision 1: current interface to netfilter/iptables */ |
| 174 | |
| 175 | static bool |
| 176 | set_match(const struct sk_buff *skb, struct xt_action_param *par) |
| 177 | { |
| 178 | const struct xt_set_info_match *info = par->matchinfo; |
| 179 | |
| 180 | return match_set(info->match_set.index, skb, par->family, |
| 181 | info->match_set.dim, |
| 182 | info->match_set.flags, |
| 183 | info->match_set.flags & IPSET_INV_MATCH); |
| 184 | } |
| 185 | |
| 186 | static int |
| 187 | set_match_checkentry(const struct xt_mtchk_param *par) |
| 188 | { |
| 189 | struct xt_set_info_match *info = par->matchinfo; |
| 190 | ip_set_id_t index; |
| 191 | |
| 192 | index = ip_set_nfnl_get_byindex(info->match_set.index); |
| 193 | |
| 194 | if (index == IPSET_INVALID_ID) { |
| 195 | pr_warning("Cannot find set indentified by id %u to match\n", |
| 196 | info->match_set.index); |
| 197 | return -ENOENT; |
| 198 | } |
| 199 | if (info->match_set.dim > IPSET_DIM_MAX) { |
| 200 | pr_warning("Protocol error: set match dimension " |
| 201 | "is over the limit!\n"); |
Jozsef Kadlecsik | eafbd3f | 2011-04-13 13:45:57 +0200 | [diff] [blame^] | 202 | ip_set_nfnl_put(info->match_set.index); |
Jozsef Kadlecsik | d956798 | 2011-02-01 15:56:00 +0100 | [diff] [blame] | 203 | return -ERANGE; |
| 204 | } |
| 205 | |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | static void |
| 210 | set_match_destroy(const struct xt_mtdtor_param *par) |
| 211 | { |
| 212 | struct xt_set_info_match *info = par->matchinfo; |
| 213 | |
| 214 | ip_set_nfnl_put(info->match_set.index); |
| 215 | } |
| 216 | |
| 217 | static unsigned int |
| 218 | set_target(struct sk_buff *skb, const struct xt_action_param *par) |
| 219 | { |
| 220 | const struct xt_set_info_target *info = par->targinfo; |
| 221 | |
| 222 | if (info->add_set.index != IPSET_INVALID_ID) |
| 223 | ip_set_add(info->add_set.index, |
| 224 | skb, par->family, |
| 225 | info->add_set.dim, |
| 226 | info->add_set.flags); |
| 227 | if (info->del_set.index != IPSET_INVALID_ID) |
| 228 | ip_set_del(info->del_set.index, |
| 229 | skb, par->family, |
Jozsef Kadlecsik | eafbd3f | 2011-04-13 13:45:57 +0200 | [diff] [blame^] | 230 | info->del_set.dim, |
Jozsef Kadlecsik | d956798 | 2011-02-01 15:56:00 +0100 | [diff] [blame] | 231 | info->del_set.flags); |
| 232 | |
| 233 | return XT_CONTINUE; |
| 234 | } |
| 235 | |
| 236 | static int |
| 237 | set_target_checkentry(const struct xt_tgchk_param *par) |
| 238 | { |
| 239 | const struct xt_set_info_target *info = par->targinfo; |
| 240 | ip_set_id_t index; |
| 241 | |
| 242 | if (info->add_set.index != IPSET_INVALID_ID) { |
| 243 | index = ip_set_nfnl_get_byindex(info->add_set.index); |
| 244 | if (index == IPSET_INVALID_ID) { |
| 245 | pr_warning("Cannot find add_set index %u as target\n", |
| 246 | info->add_set.index); |
| 247 | return -ENOENT; |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | if (info->del_set.index != IPSET_INVALID_ID) { |
| 252 | index = ip_set_nfnl_get_byindex(info->del_set.index); |
| 253 | if (index == IPSET_INVALID_ID) { |
| 254 | pr_warning("Cannot find del_set index %u as target\n", |
| 255 | info->del_set.index); |
Jozsef Kadlecsik | eafbd3f | 2011-04-13 13:45:57 +0200 | [diff] [blame^] | 256 | if (info->add_set.index != IPSET_INVALID_ID) |
| 257 | ip_set_nfnl_put(info->add_set.index); |
Jozsef Kadlecsik | d956798 | 2011-02-01 15:56:00 +0100 | [diff] [blame] | 258 | return -ENOENT; |
| 259 | } |
| 260 | } |
| 261 | if (info->add_set.dim > IPSET_DIM_MAX || |
Jozsef Kadlecsik | eafbd3f | 2011-04-13 13:45:57 +0200 | [diff] [blame^] | 262 | info->del_set.dim > IPSET_DIM_MAX) { |
Jozsef Kadlecsik | d956798 | 2011-02-01 15:56:00 +0100 | [diff] [blame] | 263 | pr_warning("Protocol error: SET target dimension " |
| 264 | "is over the limit!\n"); |
Jozsef Kadlecsik | eafbd3f | 2011-04-13 13:45:57 +0200 | [diff] [blame^] | 265 | if (info->add_set.index != IPSET_INVALID_ID) |
| 266 | ip_set_nfnl_put(info->add_set.index); |
| 267 | if (info->del_set.index != IPSET_INVALID_ID) |
| 268 | ip_set_nfnl_put(info->del_set.index); |
Jozsef Kadlecsik | d956798 | 2011-02-01 15:56:00 +0100 | [diff] [blame] | 269 | return -ERANGE; |
| 270 | } |
| 271 | |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | static void |
| 276 | set_target_destroy(const struct xt_tgdtor_param *par) |
| 277 | { |
| 278 | const struct xt_set_info_target *info = par->targinfo; |
| 279 | |
| 280 | if (info->add_set.index != IPSET_INVALID_ID) |
| 281 | ip_set_nfnl_put(info->add_set.index); |
| 282 | if (info->del_set.index != IPSET_INVALID_ID) |
| 283 | ip_set_nfnl_put(info->del_set.index); |
| 284 | } |
| 285 | |
| 286 | static struct xt_match set_matches[] __read_mostly = { |
| 287 | { |
| 288 | .name = "set", |
| 289 | .family = NFPROTO_IPV4, |
| 290 | .revision = 0, |
| 291 | .match = set_match_v0, |
| 292 | .matchsize = sizeof(struct xt_set_info_match_v0), |
| 293 | .checkentry = set_match_v0_checkentry, |
| 294 | .destroy = set_match_v0_destroy, |
| 295 | .me = THIS_MODULE |
| 296 | }, |
| 297 | { |
| 298 | .name = "set", |
| 299 | .family = NFPROTO_IPV4, |
| 300 | .revision = 1, |
| 301 | .match = set_match, |
| 302 | .matchsize = sizeof(struct xt_set_info_match), |
| 303 | .checkentry = set_match_checkentry, |
| 304 | .destroy = set_match_destroy, |
| 305 | .me = THIS_MODULE |
| 306 | }, |
| 307 | { |
| 308 | .name = "set", |
| 309 | .family = NFPROTO_IPV6, |
| 310 | .revision = 1, |
| 311 | .match = set_match, |
| 312 | .matchsize = sizeof(struct xt_set_info_match), |
| 313 | .checkentry = set_match_checkentry, |
| 314 | .destroy = set_match_destroy, |
| 315 | .me = THIS_MODULE |
| 316 | }, |
| 317 | }; |
| 318 | |
| 319 | static struct xt_target set_targets[] __read_mostly = { |
| 320 | { |
| 321 | .name = "SET", |
| 322 | .revision = 0, |
| 323 | .family = NFPROTO_IPV4, |
| 324 | .target = set_target_v0, |
| 325 | .targetsize = sizeof(struct xt_set_info_target_v0), |
| 326 | .checkentry = set_target_v0_checkentry, |
| 327 | .destroy = set_target_v0_destroy, |
| 328 | .me = THIS_MODULE |
| 329 | }, |
| 330 | { |
| 331 | .name = "SET", |
| 332 | .revision = 1, |
| 333 | .family = NFPROTO_IPV4, |
| 334 | .target = set_target, |
| 335 | .targetsize = sizeof(struct xt_set_info_target), |
| 336 | .checkentry = set_target_checkentry, |
| 337 | .destroy = set_target_destroy, |
| 338 | .me = THIS_MODULE |
| 339 | }, |
| 340 | { |
| 341 | .name = "SET", |
| 342 | .revision = 1, |
| 343 | .family = NFPROTO_IPV6, |
| 344 | .target = set_target, |
| 345 | .targetsize = sizeof(struct xt_set_info_target), |
| 346 | .checkentry = set_target_checkentry, |
| 347 | .destroy = set_target_destroy, |
| 348 | .me = THIS_MODULE |
| 349 | }, |
| 350 | }; |
| 351 | |
| 352 | static int __init xt_set_init(void) |
| 353 | { |
| 354 | int ret = xt_register_matches(set_matches, ARRAY_SIZE(set_matches)); |
| 355 | |
| 356 | if (!ret) { |
| 357 | ret = xt_register_targets(set_targets, |
| 358 | ARRAY_SIZE(set_targets)); |
| 359 | if (ret) |
| 360 | xt_unregister_matches(set_matches, |
| 361 | ARRAY_SIZE(set_matches)); |
| 362 | } |
| 363 | return ret; |
| 364 | } |
| 365 | |
| 366 | static void __exit xt_set_fini(void) |
| 367 | { |
| 368 | xt_unregister_matches(set_matches, ARRAY_SIZE(set_matches)); |
| 369 | xt_unregister_targets(set_targets, ARRAY_SIZE(set_targets)); |
| 370 | } |
| 371 | |
| 372 | module_init(xt_set_init); |
| 373 | module_exit(xt_set_fini); |