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