| 1 | /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu> |
| 2 | * Patrick Schaaf <bof@bof.de> |
| 3 | * Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | */ |
| 9 | |
| 10 | /* Kernel module for IP set management */ |
| 11 | |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/moduleparam.h> |
| 15 | #include <linux/ip.h> |
| 16 | #include <linux/skbuff.h> |
| 17 | #include <linux/spinlock.h> |
| 18 | #include <linux/rculist.h> |
| 19 | #include <net/netlink.h> |
| 20 | #include <net/net_namespace.h> |
| 21 | #include <net/netns/generic.h> |
| 22 | |
| 23 | #include <linux/netfilter.h> |
| 24 | #include <linux/netfilter/x_tables.h> |
| 25 | #include <linux/netfilter/nfnetlink.h> |
| 26 | #include <linux/netfilter/ipset/ip_set.h> |
| 27 | |
| 28 | static LIST_HEAD(ip_set_type_list); /* all registered set types */ |
| 29 | static DEFINE_MUTEX(ip_set_type_mutex); /* protects ip_set_type_list */ |
| 30 | static DEFINE_RWLOCK(ip_set_ref_lock); /* protects the set refs */ |
| 31 | |
| 32 | struct ip_set_net { |
| 33 | struct ip_set * __rcu *ip_set_list; /* all individual sets */ |
| 34 | ip_set_id_t ip_set_max; /* max number of sets */ |
| 35 | bool is_deleted; /* deleted by ip_set_net_exit */ |
| 36 | bool is_destroyed; /* all sets are destroyed */ |
| 37 | }; |
| 38 | |
| 39 | static int ip_set_net_id __read_mostly; |
| 40 | |
| 41 | static inline struct ip_set_net *ip_set_pernet(struct net *net) |
| 42 | { |
| 43 | return net_generic(net, ip_set_net_id); |
| 44 | } |
| 45 | |
| 46 | #define IP_SET_INC 64 |
| 47 | #define STRNCMP(a, b) (strncmp(a, b, IPSET_MAXNAMELEN) == 0) |
| 48 | |
| 49 | static unsigned int max_sets; |
| 50 | |
| 51 | module_param(max_sets, int, 0600); |
| 52 | MODULE_PARM_DESC(max_sets, "maximal number of sets"); |
| 53 | MODULE_LICENSE("GPL"); |
| 54 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); |
| 55 | MODULE_DESCRIPTION("core IP set support"); |
| 56 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_IPSET); |
| 57 | |
| 58 | /* When the nfnl mutex is held: */ |
| 59 | #define ip_set_dereference(p) \ |
| 60 | rcu_dereference_protected(p, 1) |
| 61 | #define ip_set(inst, id) \ |
| 62 | ip_set_dereference((inst)->ip_set_list)[id] |
| 63 | |
| 64 | /* The set types are implemented in modules and registered set types |
| 65 | * can be found in ip_set_type_list. Adding/deleting types is |
| 66 | * serialized by ip_set_type_mutex. |
| 67 | */ |
| 68 | |
| 69 | static inline void |
| 70 | ip_set_type_lock(void) |
| 71 | { |
| 72 | mutex_lock(&ip_set_type_mutex); |
| 73 | } |
| 74 | |
| 75 | static inline void |
| 76 | ip_set_type_unlock(void) |
| 77 | { |
| 78 | mutex_unlock(&ip_set_type_mutex); |
| 79 | } |
| 80 | |
| 81 | /* Register and deregister settype */ |
| 82 | |
| 83 | static struct ip_set_type * |
| 84 | find_set_type(const char *name, u8 family, u8 revision) |
| 85 | { |
| 86 | struct ip_set_type *type; |
| 87 | |
| 88 | list_for_each_entry_rcu(type, &ip_set_type_list, list) |
| 89 | if (STRNCMP(type->name, name) && |
| 90 | (type->family == family || |
| 91 | type->family == NFPROTO_UNSPEC) && |
| 92 | revision >= type->revision_min && |
| 93 | revision <= type->revision_max) |
| 94 | return type; |
| 95 | return NULL; |
| 96 | } |
| 97 | |
| 98 | /* Unlock, try to load a set type module and lock again */ |
| 99 | static bool |
| 100 | load_settype(const char *name) |
| 101 | { |
| 102 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
| 103 | pr_debug("try to load ip_set_%s\n", name); |
| 104 | if (request_module("ip_set_%s", name) < 0) { |
| 105 | pr_warn("Can't find ip_set type %s\n", name); |
| 106 | nfnl_lock(NFNL_SUBSYS_IPSET); |
| 107 | return false; |
| 108 | } |
| 109 | nfnl_lock(NFNL_SUBSYS_IPSET); |
| 110 | return true; |
| 111 | } |
| 112 | |
| 113 | /* Find a set type and reference it */ |
| 114 | #define find_set_type_get(name, family, revision, found) \ |
| 115 | __find_set_type_get(name, family, revision, found, false) |
| 116 | |
| 117 | static int |
| 118 | __find_set_type_get(const char *name, u8 family, u8 revision, |
| 119 | struct ip_set_type **found, bool retry) |
| 120 | { |
| 121 | struct ip_set_type *type; |
| 122 | int err; |
| 123 | |
| 124 | if (retry && !load_settype(name)) |
| 125 | return -IPSET_ERR_FIND_TYPE; |
| 126 | |
| 127 | rcu_read_lock(); |
| 128 | *found = find_set_type(name, family, revision); |
| 129 | if (*found) { |
| 130 | err = !try_module_get((*found)->me) ? -EFAULT : 0; |
| 131 | goto unlock; |
| 132 | } |
| 133 | /* Make sure the type is already loaded |
| 134 | * but we don't support the revision |
| 135 | */ |
| 136 | list_for_each_entry_rcu(type, &ip_set_type_list, list) |
| 137 | if (STRNCMP(type->name, name)) { |
| 138 | err = -IPSET_ERR_FIND_TYPE; |
| 139 | goto unlock; |
| 140 | } |
| 141 | rcu_read_unlock(); |
| 142 | |
| 143 | return retry ? -IPSET_ERR_FIND_TYPE : |
| 144 | __find_set_type_get(name, family, revision, found, true); |
| 145 | |
| 146 | unlock: |
| 147 | rcu_read_unlock(); |
| 148 | return err; |
| 149 | } |
| 150 | |
| 151 | /* Find a given set type by name and family. |
| 152 | * If we succeeded, the supported minimal and maximum revisions are |
| 153 | * filled out. |
| 154 | */ |
| 155 | #define find_set_type_minmax(name, family, min, max) \ |
| 156 | __find_set_type_minmax(name, family, min, max, false) |
| 157 | |
| 158 | static int |
| 159 | __find_set_type_minmax(const char *name, u8 family, u8 *min, u8 *max, |
| 160 | bool retry) |
| 161 | { |
| 162 | struct ip_set_type *type; |
| 163 | bool found = false; |
| 164 | |
| 165 | if (retry && !load_settype(name)) |
| 166 | return -IPSET_ERR_FIND_TYPE; |
| 167 | |
| 168 | *min = 255; *max = 0; |
| 169 | rcu_read_lock(); |
| 170 | list_for_each_entry_rcu(type, &ip_set_type_list, list) |
| 171 | if (STRNCMP(type->name, name) && |
| 172 | (type->family == family || |
| 173 | type->family == NFPROTO_UNSPEC)) { |
| 174 | found = true; |
| 175 | if (type->revision_min < *min) |
| 176 | *min = type->revision_min; |
| 177 | if (type->revision_max > *max) |
| 178 | *max = type->revision_max; |
| 179 | } |
| 180 | rcu_read_unlock(); |
| 181 | if (found) |
| 182 | return 0; |
| 183 | |
| 184 | return retry ? -IPSET_ERR_FIND_TYPE : |
| 185 | __find_set_type_minmax(name, family, min, max, true); |
| 186 | } |
| 187 | |
| 188 | #define family_name(f) ((f) == NFPROTO_IPV4 ? "inet" : \ |
| 189 | (f) == NFPROTO_IPV6 ? "inet6" : "any") |
| 190 | |
| 191 | /* Register a set type structure. The type is identified by |
| 192 | * the unique triple of name, family and revision. |
| 193 | */ |
| 194 | int |
| 195 | ip_set_type_register(struct ip_set_type *type) |
| 196 | { |
| 197 | int ret = 0; |
| 198 | |
| 199 | if (type->protocol != IPSET_PROTOCOL) { |
| 200 | pr_warn("ip_set type %s, family %s, revision %u:%u uses wrong protocol version %u (want %u)\n", |
| 201 | type->name, family_name(type->family), |
| 202 | type->revision_min, type->revision_max, |
| 203 | type->protocol, IPSET_PROTOCOL); |
| 204 | return -EINVAL; |
| 205 | } |
| 206 | |
| 207 | ip_set_type_lock(); |
| 208 | if (find_set_type(type->name, type->family, type->revision_min)) { |
| 209 | /* Duplicate! */ |
| 210 | pr_warn("ip_set type %s, family %s with revision min %u already registered!\n", |
| 211 | type->name, family_name(type->family), |
| 212 | type->revision_min); |
| 213 | ip_set_type_unlock(); |
| 214 | return -EINVAL; |
| 215 | } |
| 216 | list_add_rcu(&type->list, &ip_set_type_list); |
| 217 | pr_debug("type %s, family %s, revision %u:%u registered.\n", |
| 218 | type->name, family_name(type->family), |
| 219 | type->revision_min, type->revision_max); |
| 220 | ip_set_type_unlock(); |
| 221 | |
| 222 | return ret; |
| 223 | } |
| 224 | EXPORT_SYMBOL_GPL(ip_set_type_register); |
| 225 | |
| 226 | /* Unregister a set type. There's a small race with ip_set_create */ |
| 227 | void |
| 228 | ip_set_type_unregister(struct ip_set_type *type) |
| 229 | { |
| 230 | ip_set_type_lock(); |
| 231 | if (!find_set_type(type->name, type->family, type->revision_min)) { |
| 232 | pr_warn("ip_set type %s, family %s with revision min %u not registered\n", |
| 233 | type->name, family_name(type->family), |
| 234 | type->revision_min); |
| 235 | ip_set_type_unlock(); |
| 236 | return; |
| 237 | } |
| 238 | list_del_rcu(&type->list); |
| 239 | pr_debug("type %s, family %s with revision min %u unregistered.\n", |
| 240 | type->name, family_name(type->family), type->revision_min); |
| 241 | ip_set_type_unlock(); |
| 242 | |
| 243 | synchronize_rcu(); |
| 244 | } |
| 245 | EXPORT_SYMBOL_GPL(ip_set_type_unregister); |
| 246 | |
| 247 | /* Utility functions */ |
| 248 | void * |
| 249 | ip_set_alloc(size_t size) |
| 250 | { |
| 251 | void *members = NULL; |
| 252 | |
| 253 | if (size < KMALLOC_MAX_SIZE) |
| 254 | members = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); |
| 255 | |
| 256 | if (members) { |
| 257 | pr_debug("%p: allocated with kmalloc\n", members); |
| 258 | return members; |
| 259 | } |
| 260 | |
| 261 | members = vzalloc(size); |
| 262 | if (!members) |
| 263 | return NULL; |
| 264 | pr_debug("%p: allocated with vmalloc\n", members); |
| 265 | |
| 266 | return members; |
| 267 | } |
| 268 | EXPORT_SYMBOL_GPL(ip_set_alloc); |
| 269 | |
| 270 | void |
| 271 | ip_set_free(void *members) |
| 272 | { |
| 273 | pr_debug("%p: free with %s\n", members, |
| 274 | is_vmalloc_addr(members) ? "vfree" : "kfree"); |
| 275 | kvfree(members); |
| 276 | } |
| 277 | EXPORT_SYMBOL_GPL(ip_set_free); |
| 278 | |
| 279 | static inline bool |
| 280 | flag_nested(const struct nlattr *nla) |
| 281 | { |
| 282 | return nla->nla_type & NLA_F_NESTED; |
| 283 | } |
| 284 | |
| 285 | static const struct nla_policy ipaddr_policy[IPSET_ATTR_IPADDR_MAX + 1] = { |
| 286 | [IPSET_ATTR_IPADDR_IPV4] = { .type = NLA_U32 }, |
| 287 | [IPSET_ATTR_IPADDR_IPV6] = { .type = NLA_BINARY, |
| 288 | .len = sizeof(struct in6_addr) }, |
| 289 | }; |
| 290 | |
| 291 | int |
| 292 | ip_set_get_ipaddr4(struct nlattr *nla, __be32 *ipaddr) |
| 293 | { |
| 294 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX + 1]; |
| 295 | |
| 296 | if (unlikely(!flag_nested(nla))) |
| 297 | return -IPSET_ERR_PROTOCOL; |
| 298 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy)) |
| 299 | return -IPSET_ERR_PROTOCOL; |
| 300 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV4))) |
| 301 | return -IPSET_ERR_PROTOCOL; |
| 302 | |
| 303 | *ipaddr = nla_get_be32(tb[IPSET_ATTR_IPADDR_IPV4]); |
| 304 | return 0; |
| 305 | } |
| 306 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr4); |
| 307 | |
| 308 | int |
| 309 | ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr) |
| 310 | { |
| 311 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX + 1]; |
| 312 | |
| 313 | if (unlikely(!flag_nested(nla))) |
| 314 | return -IPSET_ERR_PROTOCOL; |
| 315 | |
| 316 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy)) |
| 317 | return -IPSET_ERR_PROTOCOL; |
| 318 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV6))) |
| 319 | return -IPSET_ERR_PROTOCOL; |
| 320 | |
| 321 | memcpy(ipaddr, nla_data(tb[IPSET_ATTR_IPADDR_IPV6]), |
| 322 | sizeof(struct in6_addr)); |
| 323 | return 0; |
| 324 | } |
| 325 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr6); |
| 326 | |
| 327 | typedef void (*destroyer)(void *); |
| 328 | /* ipset data extension types, in size order */ |
| 329 | |
| 330 | const struct ip_set_ext_type ip_set_extensions[] = { |
| 331 | [IPSET_EXT_ID_COUNTER] = { |
| 332 | .type = IPSET_EXT_COUNTER, |
| 333 | .flag = IPSET_FLAG_WITH_COUNTERS, |
| 334 | .len = sizeof(struct ip_set_counter), |
| 335 | .align = __alignof__(struct ip_set_counter), |
| 336 | }, |
| 337 | [IPSET_EXT_ID_TIMEOUT] = { |
| 338 | .type = IPSET_EXT_TIMEOUT, |
| 339 | .len = sizeof(unsigned long), |
| 340 | .align = __alignof__(unsigned long), |
| 341 | }, |
| 342 | [IPSET_EXT_ID_SKBINFO] = { |
| 343 | .type = IPSET_EXT_SKBINFO, |
| 344 | .flag = IPSET_FLAG_WITH_SKBINFO, |
| 345 | .len = sizeof(struct ip_set_skbinfo), |
| 346 | .align = __alignof__(struct ip_set_skbinfo), |
| 347 | }, |
| 348 | [IPSET_EXT_ID_COMMENT] = { |
| 349 | .type = IPSET_EXT_COMMENT | IPSET_EXT_DESTROY, |
| 350 | .flag = IPSET_FLAG_WITH_COMMENT, |
| 351 | .len = sizeof(struct ip_set_comment), |
| 352 | .align = __alignof__(struct ip_set_comment), |
| 353 | .destroy = (destroyer) ip_set_comment_free, |
| 354 | }, |
| 355 | }; |
| 356 | EXPORT_SYMBOL_GPL(ip_set_extensions); |
| 357 | |
| 358 | static inline bool |
| 359 | add_extension(enum ip_set_ext_id id, u32 flags, struct nlattr *tb[]) |
| 360 | { |
| 361 | return ip_set_extensions[id].flag ? |
| 362 | (flags & ip_set_extensions[id].flag) : |
| 363 | !!tb[IPSET_ATTR_TIMEOUT]; |
| 364 | } |
| 365 | |
| 366 | size_t |
| 367 | ip_set_elem_len(struct ip_set *set, struct nlattr *tb[], size_t len, |
| 368 | size_t align) |
| 369 | { |
| 370 | enum ip_set_ext_id id; |
| 371 | u32 cadt_flags = 0; |
| 372 | |
| 373 | if (tb[IPSET_ATTR_CADT_FLAGS]) |
| 374 | cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); |
| 375 | if (cadt_flags & IPSET_FLAG_WITH_FORCEADD) |
| 376 | set->flags |= IPSET_CREATE_FLAG_FORCEADD; |
| 377 | if (!align) |
| 378 | align = 1; |
| 379 | for (id = 0; id < IPSET_EXT_ID_MAX; id++) { |
| 380 | if (!add_extension(id, cadt_flags, tb)) |
| 381 | continue; |
| 382 | len = ALIGN(len, ip_set_extensions[id].align); |
| 383 | set->offset[id] = len; |
| 384 | set->extensions |= ip_set_extensions[id].type; |
| 385 | len += ip_set_extensions[id].len; |
| 386 | } |
| 387 | return ALIGN(len, align); |
| 388 | } |
| 389 | EXPORT_SYMBOL_GPL(ip_set_elem_len); |
| 390 | |
| 391 | int |
| 392 | ip_set_get_extensions(struct ip_set *set, struct nlattr *tb[], |
| 393 | struct ip_set_ext *ext) |
| 394 | { |
| 395 | u64 fullmark; |
| 396 | |
| 397 | if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || |
| 398 | !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || |
| 399 | !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) || |
| 400 | !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) || |
| 401 | !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) || |
| 402 | !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE))) |
| 403 | return -IPSET_ERR_PROTOCOL; |
| 404 | |
| 405 | if (tb[IPSET_ATTR_TIMEOUT]) { |
| 406 | if (!SET_WITH_TIMEOUT(set)) |
| 407 | return -IPSET_ERR_TIMEOUT; |
| 408 | ext->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); |
| 409 | } |
| 410 | if (tb[IPSET_ATTR_BYTES] || tb[IPSET_ATTR_PACKETS]) { |
| 411 | if (!SET_WITH_COUNTER(set)) |
| 412 | return -IPSET_ERR_COUNTER; |
| 413 | if (tb[IPSET_ATTR_BYTES]) |
| 414 | ext->bytes = be64_to_cpu(nla_get_be64( |
| 415 | tb[IPSET_ATTR_BYTES])); |
| 416 | if (tb[IPSET_ATTR_PACKETS]) |
| 417 | ext->packets = be64_to_cpu(nla_get_be64( |
| 418 | tb[IPSET_ATTR_PACKETS])); |
| 419 | } |
| 420 | if (tb[IPSET_ATTR_COMMENT]) { |
| 421 | if (!SET_WITH_COMMENT(set)) |
| 422 | return -IPSET_ERR_COMMENT; |
| 423 | ext->comment = ip_set_comment_uget(tb[IPSET_ATTR_COMMENT]); |
| 424 | } |
| 425 | if (tb[IPSET_ATTR_SKBMARK]) { |
| 426 | if (!SET_WITH_SKBINFO(set)) |
| 427 | return -IPSET_ERR_SKBINFO; |
| 428 | fullmark = be64_to_cpu(nla_get_be64(tb[IPSET_ATTR_SKBMARK])); |
| 429 | ext->skbmark = fullmark >> 32; |
| 430 | ext->skbmarkmask = fullmark & 0xffffffff; |
| 431 | } |
| 432 | if (tb[IPSET_ATTR_SKBPRIO]) { |
| 433 | if (!SET_WITH_SKBINFO(set)) |
| 434 | return -IPSET_ERR_SKBINFO; |
| 435 | ext->skbprio = be32_to_cpu(nla_get_be32( |
| 436 | tb[IPSET_ATTR_SKBPRIO])); |
| 437 | } |
| 438 | if (tb[IPSET_ATTR_SKBQUEUE]) { |
| 439 | if (!SET_WITH_SKBINFO(set)) |
| 440 | return -IPSET_ERR_SKBINFO; |
| 441 | ext->skbqueue = be16_to_cpu(nla_get_be16( |
| 442 | tb[IPSET_ATTR_SKBQUEUE])); |
| 443 | } |
| 444 | return 0; |
| 445 | } |
| 446 | EXPORT_SYMBOL_GPL(ip_set_get_extensions); |
| 447 | |
| 448 | int |
| 449 | ip_set_put_extensions(struct sk_buff *skb, const struct ip_set *set, |
| 450 | const void *e, bool active) |
| 451 | { |
| 452 | if (SET_WITH_TIMEOUT(set)) { |
| 453 | unsigned long *timeout = ext_timeout(e, set); |
| 454 | |
| 455 | if (nla_put_net32(skb, IPSET_ATTR_TIMEOUT, |
| 456 | htonl(active ? ip_set_timeout_get(timeout) |
| 457 | : *timeout))) |
| 458 | return -EMSGSIZE; |
| 459 | } |
| 460 | if (SET_WITH_COUNTER(set) && |
| 461 | ip_set_put_counter(skb, ext_counter(e, set))) |
| 462 | return -EMSGSIZE; |
| 463 | if (SET_WITH_COMMENT(set) && |
| 464 | ip_set_put_comment(skb, ext_comment(e, set))) |
| 465 | return -EMSGSIZE; |
| 466 | if (SET_WITH_SKBINFO(set) && |
| 467 | ip_set_put_skbinfo(skb, ext_skbinfo(e, set))) |
| 468 | return -EMSGSIZE; |
| 469 | return 0; |
| 470 | } |
| 471 | EXPORT_SYMBOL_GPL(ip_set_put_extensions); |
| 472 | |
| 473 | /* Creating/destroying/renaming/swapping affect the existence and |
| 474 | * the properties of a set. All of these can be executed from userspace |
| 475 | * only and serialized by the nfnl mutex indirectly from nfnetlink. |
| 476 | * |
| 477 | * Sets are identified by their index in ip_set_list and the index |
| 478 | * is used by the external references (set/SET netfilter modules). |
| 479 | * |
| 480 | * The set behind an index may change by swapping only, from userspace. |
| 481 | */ |
| 482 | |
| 483 | static inline void |
| 484 | __ip_set_get(struct ip_set *set) |
| 485 | { |
| 486 | write_lock_bh(&ip_set_ref_lock); |
| 487 | set->ref++; |
| 488 | write_unlock_bh(&ip_set_ref_lock); |
| 489 | } |
| 490 | |
| 491 | static inline void |
| 492 | __ip_set_put(struct ip_set *set) |
| 493 | { |
| 494 | write_lock_bh(&ip_set_ref_lock); |
| 495 | BUG_ON(set->ref == 0); |
| 496 | set->ref--; |
| 497 | write_unlock_bh(&ip_set_ref_lock); |
| 498 | } |
| 499 | |
| 500 | /* Add, del and test set entries from kernel. |
| 501 | * |
| 502 | * The set behind the index must exist and must be referenced |
| 503 | * so it can't be destroyed (or changed) under our foot. |
| 504 | */ |
| 505 | |
| 506 | static inline struct ip_set * |
| 507 | ip_set_rcu_get(struct net *net, ip_set_id_t index) |
| 508 | { |
| 509 | struct ip_set *set; |
| 510 | struct ip_set_net *inst = ip_set_pernet(net); |
| 511 | |
| 512 | rcu_read_lock(); |
| 513 | /* ip_set_list itself needs to be protected */ |
| 514 | set = rcu_dereference(inst->ip_set_list)[index]; |
| 515 | rcu_read_unlock(); |
| 516 | |
| 517 | return set; |
| 518 | } |
| 519 | |
| 520 | int |
| 521 | ip_set_test(ip_set_id_t index, const struct sk_buff *skb, |
| 522 | const struct xt_action_param *par, struct ip_set_adt_opt *opt) |
| 523 | { |
| 524 | struct ip_set *set = ip_set_rcu_get(par->net, index); |
| 525 | int ret = 0; |
| 526 | |
| 527 | BUG_ON(!set); |
| 528 | pr_debug("set %s, index %u\n", set->name, index); |
| 529 | |
| 530 | if (opt->dim < set->type->dimension || |
| 531 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
| 532 | return 0; |
| 533 | |
| 534 | rcu_read_lock_bh(); |
| 535 | ret = set->variant->kadt(set, skb, par, IPSET_TEST, opt); |
| 536 | rcu_read_unlock_bh(); |
| 537 | |
| 538 | if (ret == -EAGAIN) { |
| 539 | /* Type requests element to be completed */ |
| 540 | pr_debug("element must be completed, ADD is triggered\n"); |
| 541 | spin_lock_bh(&set->lock); |
| 542 | set->variant->kadt(set, skb, par, IPSET_ADD, opt); |
| 543 | spin_unlock_bh(&set->lock); |
| 544 | ret = 1; |
| 545 | } else { |
| 546 | /* --return-nomatch: invert matched element */ |
| 547 | if ((opt->cmdflags & IPSET_FLAG_RETURN_NOMATCH) && |
| 548 | (set->type->features & IPSET_TYPE_NOMATCH) && |
| 549 | (ret > 0 || ret == -ENOTEMPTY)) |
| 550 | ret = -ret; |
| 551 | } |
| 552 | |
| 553 | /* Convert error codes to nomatch */ |
| 554 | return (ret < 0 ? 0 : ret); |
| 555 | } |
| 556 | EXPORT_SYMBOL_GPL(ip_set_test); |
| 557 | |
| 558 | int |
| 559 | ip_set_add(ip_set_id_t index, const struct sk_buff *skb, |
| 560 | const struct xt_action_param *par, struct ip_set_adt_opt *opt) |
| 561 | { |
| 562 | struct ip_set *set = ip_set_rcu_get(par->net, index); |
| 563 | int ret; |
| 564 | |
| 565 | BUG_ON(!set); |
| 566 | pr_debug("set %s, index %u\n", set->name, index); |
| 567 | |
| 568 | if (opt->dim < set->type->dimension || |
| 569 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
| 570 | return -IPSET_ERR_TYPE_MISMATCH; |
| 571 | |
| 572 | spin_lock_bh(&set->lock); |
| 573 | ret = set->variant->kadt(set, skb, par, IPSET_ADD, opt); |
| 574 | spin_unlock_bh(&set->lock); |
| 575 | |
| 576 | return ret; |
| 577 | } |
| 578 | EXPORT_SYMBOL_GPL(ip_set_add); |
| 579 | |
| 580 | int |
| 581 | ip_set_del(ip_set_id_t index, const struct sk_buff *skb, |
| 582 | const struct xt_action_param *par, struct ip_set_adt_opt *opt) |
| 583 | { |
| 584 | struct ip_set *set = ip_set_rcu_get(par->net, index); |
| 585 | int ret = 0; |
| 586 | |
| 587 | BUG_ON(!set); |
| 588 | pr_debug("set %s, index %u\n", set->name, index); |
| 589 | |
| 590 | if (opt->dim < set->type->dimension || |
| 591 | !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) |
| 592 | return -IPSET_ERR_TYPE_MISMATCH; |
| 593 | |
| 594 | spin_lock_bh(&set->lock); |
| 595 | ret = set->variant->kadt(set, skb, par, IPSET_DEL, opt); |
| 596 | spin_unlock_bh(&set->lock); |
| 597 | |
| 598 | return ret; |
| 599 | } |
| 600 | EXPORT_SYMBOL_GPL(ip_set_del); |
| 601 | |
| 602 | /* Find set by name, reference it once. The reference makes sure the |
| 603 | * thing pointed to, does not go away under our feet. |
| 604 | * |
| 605 | */ |
| 606 | ip_set_id_t |
| 607 | ip_set_get_byname(struct net *net, const char *name, struct ip_set **set) |
| 608 | { |
| 609 | ip_set_id_t i, index = IPSET_INVALID_ID; |
| 610 | struct ip_set *s; |
| 611 | struct ip_set_net *inst = ip_set_pernet(net); |
| 612 | |
| 613 | rcu_read_lock(); |
| 614 | for (i = 0; i < inst->ip_set_max; i++) { |
| 615 | s = rcu_dereference(inst->ip_set_list)[i]; |
| 616 | if (s && STRNCMP(s->name, name)) { |
| 617 | __ip_set_get(s); |
| 618 | index = i; |
| 619 | *set = s; |
| 620 | break; |
| 621 | } |
| 622 | } |
| 623 | rcu_read_unlock(); |
| 624 | |
| 625 | return index; |
| 626 | } |
| 627 | EXPORT_SYMBOL_GPL(ip_set_get_byname); |
| 628 | |
| 629 | /* If the given set pointer points to a valid set, decrement |
| 630 | * reference count by 1. The caller shall not assume the index |
| 631 | * to be valid, after calling this function. |
| 632 | * |
| 633 | */ |
| 634 | |
| 635 | static inline void |
| 636 | __ip_set_put_byindex(struct ip_set_net *inst, ip_set_id_t index) |
| 637 | { |
| 638 | struct ip_set *set; |
| 639 | |
| 640 | rcu_read_lock(); |
| 641 | set = rcu_dereference(inst->ip_set_list)[index]; |
| 642 | if (set) |
| 643 | __ip_set_put(set); |
| 644 | rcu_read_unlock(); |
| 645 | } |
| 646 | |
| 647 | void |
| 648 | ip_set_put_byindex(struct net *net, ip_set_id_t index) |
| 649 | { |
| 650 | struct ip_set_net *inst = ip_set_pernet(net); |
| 651 | |
| 652 | __ip_set_put_byindex(inst, index); |
| 653 | } |
| 654 | EXPORT_SYMBOL_GPL(ip_set_put_byindex); |
| 655 | |
| 656 | /* Get the name of a set behind a set index. |
| 657 | * We assume the set is referenced, so it does exist and |
| 658 | * can't be destroyed. The set cannot be renamed due to |
| 659 | * the referencing either. |
| 660 | * |
| 661 | */ |
| 662 | const char * |
| 663 | ip_set_name_byindex(struct net *net, ip_set_id_t index) |
| 664 | { |
| 665 | const struct ip_set *set = ip_set_rcu_get(net, index); |
| 666 | |
| 667 | BUG_ON(!set); |
| 668 | BUG_ON(set->ref == 0); |
| 669 | |
| 670 | /* Referenced, so it's safe */ |
| 671 | return set->name; |
| 672 | } |
| 673 | EXPORT_SYMBOL_GPL(ip_set_name_byindex); |
| 674 | |
| 675 | /* Routines to call by external subsystems, which do not |
| 676 | * call nfnl_lock for us. |
| 677 | */ |
| 678 | |
| 679 | /* Find set by index, reference it once. The reference makes sure the |
| 680 | * thing pointed to, does not go away under our feet. |
| 681 | * |
| 682 | * The nfnl mutex is used in the function. |
| 683 | */ |
| 684 | ip_set_id_t |
| 685 | ip_set_nfnl_get_byindex(struct net *net, ip_set_id_t index) |
| 686 | { |
| 687 | struct ip_set *set; |
| 688 | struct ip_set_net *inst = ip_set_pernet(net); |
| 689 | |
| 690 | if (index >= inst->ip_set_max) |
| 691 | return IPSET_INVALID_ID; |
| 692 | |
| 693 | nfnl_lock(NFNL_SUBSYS_IPSET); |
| 694 | set = ip_set(inst, index); |
| 695 | if (set) |
| 696 | __ip_set_get(set); |
| 697 | else |
| 698 | index = IPSET_INVALID_ID; |
| 699 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
| 700 | |
| 701 | return index; |
| 702 | } |
| 703 | EXPORT_SYMBOL_GPL(ip_set_nfnl_get_byindex); |
| 704 | |
| 705 | /* If the given set pointer points to a valid set, decrement |
| 706 | * reference count by 1. The caller shall not assume the index |
| 707 | * to be valid, after calling this function. |
| 708 | * |
| 709 | * The nfnl mutex is used in the function. |
| 710 | */ |
| 711 | void |
| 712 | ip_set_nfnl_put(struct net *net, ip_set_id_t index) |
| 713 | { |
| 714 | struct ip_set *set; |
| 715 | struct ip_set_net *inst = ip_set_pernet(net); |
| 716 | |
| 717 | nfnl_lock(NFNL_SUBSYS_IPSET); |
| 718 | if (!inst->is_deleted) { /* already deleted from ip_set_net_exit() */ |
| 719 | set = ip_set(inst, index); |
| 720 | if (set) |
| 721 | __ip_set_put(set); |
| 722 | } |
| 723 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
| 724 | } |
| 725 | EXPORT_SYMBOL_GPL(ip_set_nfnl_put); |
| 726 | |
| 727 | /* Communication protocol with userspace over netlink. |
| 728 | * |
| 729 | * The commands are serialized by the nfnl mutex. |
| 730 | */ |
| 731 | |
| 732 | static inline bool |
| 733 | protocol_failed(const struct nlattr * const tb[]) |
| 734 | { |
| 735 | return !tb[IPSET_ATTR_PROTOCOL] || |
| 736 | nla_get_u8(tb[IPSET_ATTR_PROTOCOL]) != IPSET_PROTOCOL; |
| 737 | } |
| 738 | |
| 739 | static inline u32 |
| 740 | flag_exist(const struct nlmsghdr *nlh) |
| 741 | { |
| 742 | return nlh->nlmsg_flags & NLM_F_EXCL ? 0 : IPSET_FLAG_EXIST; |
| 743 | } |
| 744 | |
| 745 | static struct nlmsghdr * |
| 746 | start_msg(struct sk_buff *skb, u32 portid, u32 seq, unsigned int flags, |
| 747 | enum ipset_cmd cmd) |
| 748 | { |
| 749 | struct nlmsghdr *nlh; |
| 750 | struct nfgenmsg *nfmsg; |
| 751 | |
| 752 | nlh = nlmsg_put(skb, portid, seq, cmd | (NFNL_SUBSYS_IPSET << 8), |
| 753 | sizeof(*nfmsg), flags); |
| 754 | if (!nlh) |
| 755 | return NULL; |
| 756 | |
| 757 | nfmsg = nlmsg_data(nlh); |
| 758 | nfmsg->nfgen_family = NFPROTO_IPV4; |
| 759 | nfmsg->version = NFNETLINK_V0; |
| 760 | nfmsg->res_id = 0; |
| 761 | |
| 762 | return nlh; |
| 763 | } |
| 764 | |
| 765 | /* Create a set */ |
| 766 | |
| 767 | static const struct nla_policy ip_set_create_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 768 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 769 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, |
| 770 | .len = IPSET_MAXNAMELEN - 1 }, |
| 771 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, |
| 772 | .len = IPSET_MAXNAMELEN - 1}, |
| 773 | [IPSET_ATTR_REVISION] = { .type = NLA_U8 }, |
| 774 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, |
| 775 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, |
| 776 | }; |
| 777 | |
| 778 | static struct ip_set * |
| 779 | find_set_and_id(struct ip_set_net *inst, const char *name, ip_set_id_t *id) |
| 780 | { |
| 781 | struct ip_set *set = NULL; |
| 782 | ip_set_id_t i; |
| 783 | |
| 784 | *id = IPSET_INVALID_ID; |
| 785 | for (i = 0; i < inst->ip_set_max; i++) { |
| 786 | set = ip_set(inst, i); |
| 787 | if (set && STRNCMP(set->name, name)) { |
| 788 | *id = i; |
| 789 | break; |
| 790 | } |
| 791 | } |
| 792 | return (*id == IPSET_INVALID_ID ? NULL : set); |
| 793 | } |
| 794 | |
| 795 | static inline struct ip_set * |
| 796 | find_set(struct ip_set_net *inst, const char *name) |
| 797 | { |
| 798 | ip_set_id_t id; |
| 799 | |
| 800 | return find_set_and_id(inst, name, &id); |
| 801 | } |
| 802 | |
| 803 | static int |
| 804 | find_free_id(struct ip_set_net *inst, const char *name, ip_set_id_t *index, |
| 805 | struct ip_set **set) |
| 806 | { |
| 807 | struct ip_set *s; |
| 808 | ip_set_id_t i; |
| 809 | |
| 810 | *index = IPSET_INVALID_ID; |
| 811 | for (i = 0; i < inst->ip_set_max; i++) { |
| 812 | s = ip_set(inst, i); |
| 813 | if (!s) { |
| 814 | if (*index == IPSET_INVALID_ID) |
| 815 | *index = i; |
| 816 | } else if (STRNCMP(name, s->name)) { |
| 817 | /* Name clash */ |
| 818 | *set = s; |
| 819 | return -EEXIST; |
| 820 | } |
| 821 | } |
| 822 | if (*index == IPSET_INVALID_ID) |
| 823 | /* No free slot remained */ |
| 824 | return -IPSET_ERR_MAX_SETS; |
| 825 | return 0; |
| 826 | } |
| 827 | |
| 828 | static int |
| 829 | ip_set_none(struct sock *ctnl, struct sk_buff *skb, |
| 830 | const struct nlmsghdr *nlh, |
| 831 | const struct nlattr * const attr[]) |
| 832 | { |
| 833 | return -EOPNOTSUPP; |
| 834 | } |
| 835 | |
| 836 | static int |
| 837 | ip_set_create(struct sock *ctnl, struct sk_buff *skb, |
| 838 | const struct nlmsghdr *nlh, |
| 839 | const struct nlattr * const attr[]) |
| 840 | { |
| 841 | struct net *net = sock_net(ctnl); |
| 842 | struct ip_set_net *inst = ip_set_pernet(net); |
| 843 | struct ip_set *set, *clash = NULL; |
| 844 | ip_set_id_t index = IPSET_INVALID_ID; |
| 845 | struct nlattr *tb[IPSET_ATTR_CREATE_MAX + 1] = {}; |
| 846 | const char *name, *typename; |
| 847 | u8 family, revision; |
| 848 | u32 flags = flag_exist(nlh); |
| 849 | int ret = 0; |
| 850 | |
| 851 | if (unlikely(protocol_failed(attr) || |
| 852 | !attr[IPSET_ATTR_SETNAME] || |
| 853 | !attr[IPSET_ATTR_TYPENAME] || |
| 854 | !attr[IPSET_ATTR_REVISION] || |
| 855 | !attr[IPSET_ATTR_FAMILY] || |
| 856 | (attr[IPSET_ATTR_DATA] && |
| 857 | !flag_nested(attr[IPSET_ATTR_DATA])))) |
| 858 | return -IPSET_ERR_PROTOCOL; |
| 859 | |
| 860 | name = nla_data(attr[IPSET_ATTR_SETNAME]); |
| 861 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); |
| 862 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); |
| 863 | revision = nla_get_u8(attr[IPSET_ATTR_REVISION]); |
| 864 | pr_debug("setname: %s, typename: %s, family: %s, revision: %u\n", |
| 865 | name, typename, family_name(family), revision); |
| 866 | |
| 867 | /* First, and without any locks, allocate and initialize |
| 868 | * a normal base set structure. |
| 869 | */ |
| 870 | set = kzalloc(sizeof(*set), GFP_KERNEL); |
| 871 | if (!set) |
| 872 | return -ENOMEM; |
| 873 | spin_lock_init(&set->lock); |
| 874 | strlcpy(set->name, name, IPSET_MAXNAMELEN); |
| 875 | set->family = family; |
| 876 | set->revision = revision; |
| 877 | |
| 878 | /* Next, check that we know the type, and take |
| 879 | * a reference on the type, to make sure it stays available |
| 880 | * while constructing our new set. |
| 881 | * |
| 882 | * After referencing the type, we try to create the type |
| 883 | * specific part of the set without holding any locks. |
| 884 | */ |
| 885 | ret = find_set_type_get(typename, family, revision, &set->type); |
| 886 | if (ret) |
| 887 | goto out; |
| 888 | |
| 889 | /* Without holding any locks, create private part. */ |
| 890 | if (attr[IPSET_ATTR_DATA] && |
| 891 | nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA], |
| 892 | set->type->create_policy)) { |
| 893 | ret = -IPSET_ERR_PROTOCOL; |
| 894 | goto put_out; |
| 895 | } |
| 896 | |
| 897 | ret = set->type->create(net, set, tb, flags); |
| 898 | if (ret != 0) |
| 899 | goto put_out; |
| 900 | |
| 901 | /* BTW, ret==0 here. */ |
| 902 | |
| 903 | /* Here, we have a valid, constructed set and we are protected |
| 904 | * by the nfnl mutex. Find the first free index in ip_set_list |
| 905 | * and check clashing. |
| 906 | */ |
| 907 | ret = find_free_id(inst, set->name, &index, &clash); |
| 908 | if (ret == -EEXIST) { |
| 909 | /* If this is the same set and requested, ignore error */ |
| 910 | if ((flags & IPSET_FLAG_EXIST) && |
| 911 | STRNCMP(set->type->name, clash->type->name) && |
| 912 | set->type->family == clash->type->family && |
| 913 | set->type->revision_min == clash->type->revision_min && |
| 914 | set->type->revision_max == clash->type->revision_max && |
| 915 | set->variant->same_set(set, clash)) |
| 916 | ret = 0; |
| 917 | goto cleanup; |
| 918 | } else if (ret == -IPSET_ERR_MAX_SETS) { |
| 919 | struct ip_set **list, **tmp; |
| 920 | ip_set_id_t i = inst->ip_set_max + IP_SET_INC; |
| 921 | |
| 922 | if (i < inst->ip_set_max || i == IPSET_INVALID_ID) |
| 923 | /* Wraparound */ |
| 924 | goto cleanup; |
| 925 | |
| 926 | list = kcalloc(i, sizeof(struct ip_set *), GFP_KERNEL); |
| 927 | if (!list) |
| 928 | goto cleanup; |
| 929 | /* nfnl mutex is held, both lists are valid */ |
| 930 | tmp = ip_set_dereference(inst->ip_set_list); |
| 931 | memcpy(list, tmp, sizeof(struct ip_set *) * inst->ip_set_max); |
| 932 | rcu_assign_pointer(inst->ip_set_list, list); |
| 933 | /* Make sure all current packets have passed through */ |
| 934 | synchronize_net(); |
| 935 | /* Use new list */ |
| 936 | index = inst->ip_set_max; |
| 937 | inst->ip_set_max = i; |
| 938 | kfree(tmp); |
| 939 | ret = 0; |
| 940 | } else if (ret) { |
| 941 | goto cleanup; |
| 942 | } |
| 943 | |
| 944 | /* Finally! Add our shiny new set to the list, and be done. */ |
| 945 | pr_debug("create: '%s' created with index %u!\n", set->name, index); |
| 946 | ip_set(inst, index) = set; |
| 947 | |
| 948 | return ret; |
| 949 | |
| 950 | cleanup: |
| 951 | set->variant->destroy(set); |
| 952 | put_out: |
| 953 | module_put(set->type->me); |
| 954 | out: |
| 955 | kfree(set); |
| 956 | return ret; |
| 957 | } |
| 958 | |
| 959 | /* Destroy sets */ |
| 960 | |
| 961 | static const struct nla_policy |
| 962 | ip_set_setname_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 963 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 964 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, |
| 965 | .len = IPSET_MAXNAMELEN - 1 }, |
| 966 | }; |
| 967 | |
| 968 | static void |
| 969 | ip_set_destroy_set(struct ip_set *set) |
| 970 | { |
| 971 | pr_debug("set: %s\n", set->name); |
| 972 | |
| 973 | /* Must call it without holding any lock */ |
| 974 | set->variant->destroy(set); |
| 975 | module_put(set->type->me); |
| 976 | kfree(set); |
| 977 | } |
| 978 | |
| 979 | static int |
| 980 | ip_set_destroy(struct sock *ctnl, struct sk_buff *skb, |
| 981 | const struct nlmsghdr *nlh, |
| 982 | const struct nlattr * const attr[]) |
| 983 | { |
| 984 | struct ip_set_net *inst = ip_set_pernet(sock_net(ctnl)); |
| 985 | struct ip_set *s; |
| 986 | ip_set_id_t i; |
| 987 | int ret = 0; |
| 988 | |
| 989 | if (unlikely(protocol_failed(attr))) |
| 990 | return -IPSET_ERR_PROTOCOL; |
| 991 | |
| 992 | /* Commands are serialized and references are |
| 993 | * protected by the ip_set_ref_lock. |
| 994 | * External systems (i.e. xt_set) must call |
| 995 | * ip_set_put|get_nfnl_* functions, that way we |
| 996 | * can safely check references here. |
| 997 | * |
| 998 | * list:set timer can only decrement the reference |
| 999 | * counter, so if it's already zero, we can proceed |
| 1000 | * without holding the lock. |
| 1001 | */ |
| 1002 | read_lock_bh(&ip_set_ref_lock); |
| 1003 | if (!attr[IPSET_ATTR_SETNAME]) { |
| 1004 | for (i = 0; i < inst->ip_set_max; i++) { |
| 1005 | s = ip_set(inst, i); |
| 1006 | if (s && s->ref) { |
| 1007 | ret = -IPSET_ERR_BUSY; |
| 1008 | goto out; |
| 1009 | } |
| 1010 | } |
| 1011 | inst->is_destroyed = true; |
| 1012 | read_unlock_bh(&ip_set_ref_lock); |
| 1013 | for (i = 0; i < inst->ip_set_max; i++) { |
| 1014 | s = ip_set(inst, i); |
| 1015 | if (s) { |
| 1016 | ip_set(inst, i) = NULL; |
| 1017 | ip_set_destroy_set(s); |
| 1018 | } |
| 1019 | } |
| 1020 | /* Modified by ip_set_destroy() only, which is serialized */ |
| 1021 | inst->is_destroyed = false; |
| 1022 | } else { |
| 1023 | s = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), |
| 1024 | &i); |
| 1025 | if (!s) { |
| 1026 | ret = -ENOENT; |
| 1027 | goto out; |
| 1028 | } else if (s->ref) { |
| 1029 | ret = -IPSET_ERR_BUSY; |
| 1030 | goto out; |
| 1031 | } |
| 1032 | ip_set(inst, i) = NULL; |
| 1033 | read_unlock_bh(&ip_set_ref_lock); |
| 1034 | |
| 1035 | ip_set_destroy_set(s); |
| 1036 | } |
| 1037 | return 0; |
| 1038 | out: |
| 1039 | read_unlock_bh(&ip_set_ref_lock); |
| 1040 | return ret; |
| 1041 | } |
| 1042 | |
| 1043 | /* Flush sets */ |
| 1044 | |
| 1045 | static void |
| 1046 | ip_set_flush_set(struct ip_set *set) |
| 1047 | { |
| 1048 | pr_debug("set: %s\n", set->name); |
| 1049 | |
| 1050 | spin_lock_bh(&set->lock); |
| 1051 | set->variant->flush(set); |
| 1052 | spin_unlock_bh(&set->lock); |
| 1053 | } |
| 1054 | |
| 1055 | static int |
| 1056 | ip_set_flush(struct sock *ctnl, struct sk_buff *skb, |
| 1057 | const struct nlmsghdr *nlh, |
| 1058 | const struct nlattr * const attr[]) |
| 1059 | { |
| 1060 | struct ip_set_net *inst = ip_set_pernet(sock_net(ctnl)); |
| 1061 | struct ip_set *s; |
| 1062 | ip_set_id_t i; |
| 1063 | |
| 1064 | if (unlikely(protocol_failed(attr))) |
| 1065 | return -IPSET_ERR_PROTOCOL; |
| 1066 | |
| 1067 | if (!attr[IPSET_ATTR_SETNAME]) { |
| 1068 | for (i = 0; i < inst->ip_set_max; i++) { |
| 1069 | s = ip_set(inst, i); |
| 1070 | if (s) |
| 1071 | ip_set_flush_set(s); |
| 1072 | } |
| 1073 | } else { |
| 1074 | s = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
| 1075 | if (!s) |
| 1076 | return -ENOENT; |
| 1077 | |
| 1078 | ip_set_flush_set(s); |
| 1079 | } |
| 1080 | |
| 1081 | return 0; |
| 1082 | } |
| 1083 | |
| 1084 | /* Rename a set */ |
| 1085 | |
| 1086 | static const struct nla_policy |
| 1087 | ip_set_setname2_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 1088 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 1089 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, |
| 1090 | .len = IPSET_MAXNAMELEN - 1 }, |
| 1091 | [IPSET_ATTR_SETNAME2] = { .type = NLA_NUL_STRING, |
| 1092 | .len = IPSET_MAXNAMELEN - 1 }, |
| 1093 | }; |
| 1094 | |
| 1095 | static int |
| 1096 | ip_set_rename(struct sock *ctnl, struct sk_buff *skb, |
| 1097 | const struct nlmsghdr *nlh, |
| 1098 | const struct nlattr * const attr[]) |
| 1099 | { |
| 1100 | struct ip_set_net *inst = ip_set_pernet(sock_net(ctnl)); |
| 1101 | struct ip_set *set, *s; |
| 1102 | const char *name2; |
| 1103 | ip_set_id_t i; |
| 1104 | int ret = 0; |
| 1105 | |
| 1106 | if (unlikely(protocol_failed(attr) || |
| 1107 | !attr[IPSET_ATTR_SETNAME] || |
| 1108 | !attr[IPSET_ATTR_SETNAME2])) |
| 1109 | return -IPSET_ERR_PROTOCOL; |
| 1110 | |
| 1111 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
| 1112 | if (!set) |
| 1113 | return -ENOENT; |
| 1114 | |
| 1115 | read_lock_bh(&ip_set_ref_lock); |
| 1116 | if (set->ref != 0) { |
| 1117 | ret = -IPSET_ERR_REFERENCED; |
| 1118 | goto out; |
| 1119 | } |
| 1120 | |
| 1121 | name2 = nla_data(attr[IPSET_ATTR_SETNAME2]); |
| 1122 | for (i = 0; i < inst->ip_set_max; i++) { |
| 1123 | s = ip_set(inst, i); |
| 1124 | if (s && STRNCMP(s->name, name2)) { |
| 1125 | ret = -IPSET_ERR_EXIST_SETNAME2; |
| 1126 | goto out; |
| 1127 | } |
| 1128 | } |
| 1129 | strncpy(set->name, name2, IPSET_MAXNAMELEN); |
| 1130 | |
| 1131 | out: |
| 1132 | read_unlock_bh(&ip_set_ref_lock); |
| 1133 | return ret; |
| 1134 | } |
| 1135 | |
| 1136 | /* Swap two sets so that name/index points to the other. |
| 1137 | * References and set names are also swapped. |
| 1138 | * |
| 1139 | * The commands are serialized by the nfnl mutex and references are |
| 1140 | * protected by the ip_set_ref_lock. The kernel interfaces |
| 1141 | * do not hold the mutex but the pointer settings are atomic |
| 1142 | * so the ip_set_list always contains valid pointers to the sets. |
| 1143 | */ |
| 1144 | |
| 1145 | static int |
| 1146 | ip_set_swap(struct sock *ctnl, struct sk_buff *skb, |
| 1147 | const struct nlmsghdr *nlh, |
| 1148 | const struct nlattr * const attr[]) |
| 1149 | { |
| 1150 | struct ip_set_net *inst = ip_set_pernet(sock_net(ctnl)); |
| 1151 | struct ip_set *from, *to; |
| 1152 | ip_set_id_t from_id, to_id; |
| 1153 | char from_name[IPSET_MAXNAMELEN]; |
| 1154 | |
| 1155 | if (unlikely(protocol_failed(attr) || |
| 1156 | !attr[IPSET_ATTR_SETNAME] || |
| 1157 | !attr[IPSET_ATTR_SETNAME2])) |
| 1158 | return -IPSET_ERR_PROTOCOL; |
| 1159 | |
| 1160 | from = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), |
| 1161 | &from_id); |
| 1162 | if (!from) |
| 1163 | return -ENOENT; |
| 1164 | |
| 1165 | to = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME2]), |
| 1166 | &to_id); |
| 1167 | if (!to) |
| 1168 | return -IPSET_ERR_EXIST_SETNAME2; |
| 1169 | |
| 1170 | /* Features must not change. |
| 1171 | * Not an artifical restriction anymore, as we must prevent |
| 1172 | * possible loops created by swapping in setlist type of sets. |
| 1173 | */ |
| 1174 | if (!(from->type->features == to->type->features && |
| 1175 | from->family == to->family)) |
| 1176 | return -IPSET_ERR_TYPE_MISMATCH; |
| 1177 | |
| 1178 | strncpy(from_name, from->name, IPSET_MAXNAMELEN); |
| 1179 | strncpy(from->name, to->name, IPSET_MAXNAMELEN); |
| 1180 | strncpy(to->name, from_name, IPSET_MAXNAMELEN); |
| 1181 | |
| 1182 | write_lock_bh(&ip_set_ref_lock); |
| 1183 | swap(from->ref, to->ref); |
| 1184 | ip_set(inst, from_id) = to; |
| 1185 | ip_set(inst, to_id) = from; |
| 1186 | write_unlock_bh(&ip_set_ref_lock); |
| 1187 | |
| 1188 | return 0; |
| 1189 | } |
| 1190 | |
| 1191 | /* List/save set data */ |
| 1192 | |
| 1193 | #define DUMP_INIT 0 |
| 1194 | #define DUMP_ALL 1 |
| 1195 | #define DUMP_ONE 2 |
| 1196 | #define DUMP_LAST 3 |
| 1197 | |
| 1198 | #define DUMP_TYPE(arg) (((u32)(arg)) & 0x0000FFFF) |
| 1199 | #define DUMP_FLAGS(arg) (((u32)(arg)) >> 16) |
| 1200 | |
| 1201 | static int |
| 1202 | ip_set_dump_done(struct netlink_callback *cb) |
| 1203 | { |
| 1204 | if (cb->args[IPSET_CB_ARG0]) { |
| 1205 | struct ip_set_net *inst = |
| 1206 | (struct ip_set_net *)cb->args[IPSET_CB_NET]; |
| 1207 | ip_set_id_t index = (ip_set_id_t)cb->args[IPSET_CB_INDEX]; |
| 1208 | struct ip_set *set = ip_set(inst, index); |
| 1209 | |
| 1210 | if (set->variant->uref) |
| 1211 | set->variant->uref(set, cb, false); |
| 1212 | pr_debug("release set %s\n", set->name); |
| 1213 | __ip_set_put_byindex(inst, index); |
| 1214 | } |
| 1215 | return 0; |
| 1216 | } |
| 1217 | |
| 1218 | static inline void |
| 1219 | dump_attrs(struct nlmsghdr *nlh) |
| 1220 | { |
| 1221 | const struct nlattr *attr; |
| 1222 | int rem; |
| 1223 | |
| 1224 | pr_debug("dump nlmsg\n"); |
| 1225 | nlmsg_for_each_attr(attr, nlh, sizeof(struct nfgenmsg), rem) { |
| 1226 | pr_debug("type: %u, len %u\n", nla_type(attr), attr->nla_len); |
| 1227 | } |
| 1228 | } |
| 1229 | |
| 1230 | static int |
| 1231 | dump_init(struct netlink_callback *cb, struct ip_set_net *inst) |
| 1232 | { |
| 1233 | struct nlmsghdr *nlh = nlmsg_hdr(cb->skb); |
| 1234 | int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); |
| 1235 | struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1]; |
| 1236 | struct nlattr *attr = (void *)nlh + min_len; |
| 1237 | u32 dump_type; |
| 1238 | ip_set_id_t index; |
| 1239 | |
| 1240 | /* Second pass, so parser can't fail */ |
| 1241 | nla_parse(cda, IPSET_ATTR_CMD_MAX, |
| 1242 | attr, nlh->nlmsg_len - min_len, ip_set_setname_policy); |
| 1243 | |
| 1244 | if (cda[IPSET_ATTR_SETNAME]) { |
| 1245 | struct ip_set *set; |
| 1246 | |
| 1247 | set = find_set_and_id(inst, nla_data(cda[IPSET_ATTR_SETNAME]), |
| 1248 | &index); |
| 1249 | if (!set) |
| 1250 | return -ENOENT; |
| 1251 | |
| 1252 | dump_type = DUMP_ONE; |
| 1253 | cb->args[IPSET_CB_INDEX] = index; |
| 1254 | } else { |
| 1255 | dump_type = DUMP_ALL; |
| 1256 | } |
| 1257 | |
| 1258 | if (cda[IPSET_ATTR_FLAGS]) { |
| 1259 | u32 f = ip_set_get_h32(cda[IPSET_ATTR_FLAGS]); |
| 1260 | |
| 1261 | dump_type |= (f << 16); |
| 1262 | } |
| 1263 | cb->args[IPSET_CB_NET] = (unsigned long)inst; |
| 1264 | cb->args[IPSET_CB_DUMP] = dump_type; |
| 1265 | |
| 1266 | return 0; |
| 1267 | } |
| 1268 | |
| 1269 | static int |
| 1270 | ip_set_dump_start(struct sk_buff *skb, struct netlink_callback *cb) |
| 1271 | { |
| 1272 | ip_set_id_t index = IPSET_INVALID_ID, max; |
| 1273 | struct ip_set *set = NULL; |
| 1274 | struct nlmsghdr *nlh = NULL; |
| 1275 | unsigned int flags = NETLINK_CB(cb->skb).portid ? NLM_F_MULTI : 0; |
| 1276 | struct ip_set_net *inst = ip_set_pernet(sock_net(skb->sk)); |
| 1277 | u32 dump_type, dump_flags; |
| 1278 | bool is_destroyed; |
| 1279 | int ret = 0; |
| 1280 | |
| 1281 | if (!cb->args[IPSET_CB_DUMP]) { |
| 1282 | ret = dump_init(cb, inst); |
| 1283 | if (ret < 0) { |
| 1284 | nlh = nlmsg_hdr(cb->skb); |
| 1285 | /* We have to create and send the error message |
| 1286 | * manually :-( |
| 1287 | */ |
| 1288 | if (nlh->nlmsg_flags & NLM_F_ACK) |
| 1289 | netlink_ack(cb->skb, nlh, ret); |
| 1290 | return ret; |
| 1291 | } |
| 1292 | } |
| 1293 | |
| 1294 | if (cb->args[IPSET_CB_INDEX] >= inst->ip_set_max) |
| 1295 | goto out; |
| 1296 | |
| 1297 | dump_type = DUMP_TYPE(cb->args[IPSET_CB_DUMP]); |
| 1298 | dump_flags = DUMP_FLAGS(cb->args[IPSET_CB_DUMP]); |
| 1299 | max = dump_type == DUMP_ONE ? cb->args[IPSET_CB_INDEX] + 1 |
| 1300 | : inst->ip_set_max; |
| 1301 | dump_last: |
| 1302 | pr_debug("dump type, flag: %u %u index: %ld\n", |
| 1303 | dump_type, dump_flags, cb->args[IPSET_CB_INDEX]); |
| 1304 | for (; cb->args[IPSET_CB_INDEX] < max; cb->args[IPSET_CB_INDEX]++) { |
| 1305 | index = (ip_set_id_t)cb->args[IPSET_CB_INDEX]; |
| 1306 | write_lock_bh(&ip_set_ref_lock); |
| 1307 | set = ip_set(inst, index); |
| 1308 | is_destroyed = inst->is_destroyed; |
| 1309 | if (!set || is_destroyed) { |
| 1310 | write_unlock_bh(&ip_set_ref_lock); |
| 1311 | if (dump_type == DUMP_ONE) { |
| 1312 | ret = -ENOENT; |
| 1313 | goto out; |
| 1314 | } |
| 1315 | if (is_destroyed) { |
| 1316 | /* All sets are just being destroyed */ |
| 1317 | ret = 0; |
| 1318 | goto out; |
| 1319 | } |
| 1320 | continue; |
| 1321 | } |
| 1322 | /* When dumping all sets, we must dump "sorted" |
| 1323 | * so that lists (unions of sets) are dumped last. |
| 1324 | */ |
| 1325 | if (dump_type != DUMP_ONE && |
| 1326 | ((dump_type == DUMP_ALL) == |
| 1327 | !!(set->type->features & IPSET_DUMP_LAST))) { |
| 1328 | write_unlock_bh(&ip_set_ref_lock); |
| 1329 | continue; |
| 1330 | } |
| 1331 | pr_debug("List set: %s\n", set->name); |
| 1332 | if (!cb->args[IPSET_CB_ARG0]) { |
| 1333 | /* Start listing: make sure set won't be destroyed */ |
| 1334 | pr_debug("reference set\n"); |
| 1335 | set->ref++; |
| 1336 | } |
| 1337 | write_unlock_bh(&ip_set_ref_lock); |
| 1338 | nlh = start_msg(skb, NETLINK_CB(cb->skb).portid, |
| 1339 | cb->nlh->nlmsg_seq, flags, |
| 1340 | IPSET_CMD_LIST); |
| 1341 | if (!nlh) { |
| 1342 | ret = -EMSGSIZE; |
| 1343 | goto release_refcount; |
| 1344 | } |
| 1345 | if (nla_put_u8(skb, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || |
| 1346 | nla_put_string(skb, IPSET_ATTR_SETNAME, set->name)) |
| 1347 | goto nla_put_failure; |
| 1348 | if (dump_flags & IPSET_FLAG_LIST_SETNAME) |
| 1349 | goto next_set; |
| 1350 | switch (cb->args[IPSET_CB_ARG0]) { |
| 1351 | case 0: |
| 1352 | /* Core header data */ |
| 1353 | if (nla_put_string(skb, IPSET_ATTR_TYPENAME, |
| 1354 | set->type->name) || |
| 1355 | nla_put_u8(skb, IPSET_ATTR_FAMILY, |
| 1356 | set->family) || |
| 1357 | nla_put_u8(skb, IPSET_ATTR_REVISION, |
| 1358 | set->revision)) |
| 1359 | goto nla_put_failure; |
| 1360 | ret = set->variant->head(set, skb); |
| 1361 | if (ret < 0) |
| 1362 | goto release_refcount; |
| 1363 | if (dump_flags & IPSET_FLAG_LIST_HEADER) |
| 1364 | goto next_set; |
| 1365 | if (set->variant->uref) |
| 1366 | set->variant->uref(set, cb, true); |
| 1367 | /* Fall through and add elements */ |
| 1368 | default: |
| 1369 | rcu_read_lock_bh(); |
| 1370 | ret = set->variant->list(set, skb, cb); |
| 1371 | rcu_read_unlock_bh(); |
| 1372 | if (!cb->args[IPSET_CB_ARG0]) |
| 1373 | /* Set is done, proceed with next one */ |
| 1374 | goto next_set; |
| 1375 | goto release_refcount; |
| 1376 | } |
| 1377 | } |
| 1378 | /* If we dump all sets, continue with dumping last ones */ |
| 1379 | if (dump_type == DUMP_ALL) { |
| 1380 | dump_type = DUMP_LAST; |
| 1381 | cb->args[IPSET_CB_DUMP] = dump_type | (dump_flags << 16); |
| 1382 | cb->args[IPSET_CB_INDEX] = 0; |
| 1383 | if (set && set->variant->uref) |
| 1384 | set->variant->uref(set, cb, false); |
| 1385 | goto dump_last; |
| 1386 | } |
| 1387 | goto out; |
| 1388 | |
| 1389 | nla_put_failure: |
| 1390 | ret = -EFAULT; |
| 1391 | next_set: |
| 1392 | if (dump_type == DUMP_ONE) |
| 1393 | cb->args[IPSET_CB_INDEX] = IPSET_INVALID_ID; |
| 1394 | else |
| 1395 | cb->args[IPSET_CB_INDEX]++; |
| 1396 | release_refcount: |
| 1397 | /* If there was an error or set is done, release set */ |
| 1398 | if (ret || !cb->args[IPSET_CB_ARG0]) { |
| 1399 | set = ip_set(inst, index); |
| 1400 | if (set->variant->uref) |
| 1401 | set->variant->uref(set, cb, false); |
| 1402 | pr_debug("release set %s\n", set->name); |
| 1403 | __ip_set_put_byindex(inst, index); |
| 1404 | cb->args[IPSET_CB_ARG0] = 0; |
| 1405 | } |
| 1406 | out: |
| 1407 | if (nlh) { |
| 1408 | nlmsg_end(skb, nlh); |
| 1409 | pr_debug("nlmsg_len: %u\n", nlh->nlmsg_len); |
| 1410 | dump_attrs(nlh); |
| 1411 | } |
| 1412 | |
| 1413 | return ret < 0 ? ret : skb->len; |
| 1414 | } |
| 1415 | |
| 1416 | static int |
| 1417 | ip_set_dump(struct sock *ctnl, struct sk_buff *skb, |
| 1418 | const struct nlmsghdr *nlh, |
| 1419 | const struct nlattr * const attr[]) |
| 1420 | { |
| 1421 | if (unlikely(protocol_failed(attr))) |
| 1422 | return -IPSET_ERR_PROTOCOL; |
| 1423 | |
| 1424 | { |
| 1425 | struct netlink_dump_control c = { |
| 1426 | .dump = ip_set_dump_start, |
| 1427 | .done = ip_set_dump_done, |
| 1428 | }; |
| 1429 | return netlink_dump_start(ctnl, skb, nlh, &c); |
| 1430 | } |
| 1431 | } |
| 1432 | |
| 1433 | /* Add, del and test */ |
| 1434 | |
| 1435 | static const struct nla_policy ip_set_adt_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 1436 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 1437 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, |
| 1438 | .len = IPSET_MAXNAMELEN - 1 }, |
| 1439 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, |
| 1440 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, |
| 1441 | [IPSET_ATTR_ADT] = { .type = NLA_NESTED }, |
| 1442 | }; |
| 1443 | |
| 1444 | static int |
| 1445 | call_ad(struct sock *ctnl, struct sk_buff *skb, struct ip_set *set, |
| 1446 | struct nlattr *tb[], enum ipset_adt adt, |
| 1447 | u32 flags, bool use_lineno) |
| 1448 | { |
| 1449 | int ret; |
| 1450 | u32 lineno = 0; |
| 1451 | bool eexist = flags & IPSET_FLAG_EXIST, retried = false; |
| 1452 | |
| 1453 | do { |
| 1454 | spin_lock_bh(&set->lock); |
| 1455 | ret = set->variant->uadt(set, tb, adt, &lineno, flags, retried); |
| 1456 | spin_unlock_bh(&set->lock); |
| 1457 | retried = true; |
| 1458 | } while (ret == -EAGAIN && |
| 1459 | set->variant->resize && |
| 1460 | (ret = set->variant->resize(set, retried)) == 0); |
| 1461 | |
| 1462 | if (!ret || (ret == -IPSET_ERR_EXIST && eexist)) |
| 1463 | return 0; |
| 1464 | if (lineno && use_lineno) { |
| 1465 | /* Error in restore/batch mode: send back lineno */ |
| 1466 | struct nlmsghdr *rep, *nlh = nlmsg_hdr(skb); |
| 1467 | struct sk_buff *skb2; |
| 1468 | struct nlmsgerr *errmsg; |
| 1469 | size_t payload = min(SIZE_MAX, |
| 1470 | sizeof(*errmsg) + nlmsg_len(nlh)); |
| 1471 | int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); |
| 1472 | struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1]; |
| 1473 | struct nlattr *cmdattr; |
| 1474 | u32 *errline; |
| 1475 | |
| 1476 | skb2 = nlmsg_new(payload, GFP_KERNEL); |
| 1477 | if (!skb2) |
| 1478 | return -ENOMEM; |
| 1479 | rep = __nlmsg_put(skb2, NETLINK_CB(skb).portid, |
| 1480 | nlh->nlmsg_seq, NLMSG_ERROR, payload, 0); |
| 1481 | errmsg = nlmsg_data(rep); |
| 1482 | errmsg->error = ret; |
| 1483 | memcpy(&errmsg->msg, nlh, nlh->nlmsg_len); |
| 1484 | cmdattr = (void *)&errmsg->msg + min_len; |
| 1485 | |
| 1486 | nla_parse(cda, IPSET_ATTR_CMD_MAX, |
| 1487 | cmdattr, nlh->nlmsg_len - min_len, |
| 1488 | ip_set_adt_policy); |
| 1489 | |
| 1490 | errline = nla_data(cda[IPSET_ATTR_LINENO]); |
| 1491 | |
| 1492 | *errline = lineno; |
| 1493 | |
| 1494 | netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, |
| 1495 | MSG_DONTWAIT); |
| 1496 | /* Signal netlink not to send its ACK/errmsg. */ |
| 1497 | return -EINTR; |
| 1498 | } |
| 1499 | |
| 1500 | return ret; |
| 1501 | } |
| 1502 | |
| 1503 | static int |
| 1504 | ip_set_uadd(struct sock *ctnl, struct sk_buff *skb, |
| 1505 | const struct nlmsghdr *nlh, |
| 1506 | const struct nlattr * const attr[]) |
| 1507 | { |
| 1508 | struct ip_set_net *inst = ip_set_pernet(sock_net(ctnl)); |
| 1509 | struct ip_set *set; |
| 1510 | struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; |
| 1511 | const struct nlattr *nla; |
| 1512 | u32 flags = flag_exist(nlh); |
| 1513 | bool use_lineno; |
| 1514 | int ret = 0; |
| 1515 | |
| 1516 | if (unlikely(protocol_failed(attr) || |
| 1517 | !attr[IPSET_ATTR_SETNAME] || |
| 1518 | !((attr[IPSET_ATTR_DATA] != NULL) ^ |
| 1519 | (attr[IPSET_ATTR_ADT] != NULL)) || |
| 1520 | (attr[IPSET_ATTR_DATA] && |
| 1521 | !flag_nested(attr[IPSET_ATTR_DATA])) || |
| 1522 | (attr[IPSET_ATTR_ADT] && |
| 1523 | (!flag_nested(attr[IPSET_ATTR_ADT]) || |
| 1524 | !attr[IPSET_ATTR_LINENO])))) |
| 1525 | return -IPSET_ERR_PROTOCOL; |
| 1526 | |
| 1527 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
| 1528 | if (!set) |
| 1529 | return -ENOENT; |
| 1530 | |
| 1531 | use_lineno = !!attr[IPSET_ATTR_LINENO]; |
| 1532 | if (attr[IPSET_ATTR_DATA]) { |
| 1533 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, |
| 1534 | attr[IPSET_ATTR_DATA], |
| 1535 | set->type->adt_policy)) |
| 1536 | return -IPSET_ERR_PROTOCOL; |
| 1537 | ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, flags, |
| 1538 | use_lineno); |
| 1539 | } else { |
| 1540 | int nla_rem; |
| 1541 | |
| 1542 | nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { |
| 1543 | memset(tb, 0, sizeof(tb)); |
| 1544 | if (nla_type(nla) != IPSET_ATTR_DATA || |
| 1545 | !flag_nested(nla) || |
| 1546 | nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, |
| 1547 | set->type->adt_policy)) |
| 1548 | return -IPSET_ERR_PROTOCOL; |
| 1549 | ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, |
| 1550 | flags, use_lineno); |
| 1551 | if (ret < 0) |
| 1552 | return ret; |
| 1553 | } |
| 1554 | } |
| 1555 | return ret; |
| 1556 | } |
| 1557 | |
| 1558 | static int |
| 1559 | ip_set_udel(struct sock *ctnl, struct sk_buff *skb, |
| 1560 | const struct nlmsghdr *nlh, |
| 1561 | const struct nlattr * const attr[]) |
| 1562 | { |
| 1563 | struct ip_set_net *inst = ip_set_pernet(sock_net(ctnl)); |
| 1564 | struct ip_set *set; |
| 1565 | struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; |
| 1566 | const struct nlattr *nla; |
| 1567 | u32 flags = flag_exist(nlh); |
| 1568 | bool use_lineno; |
| 1569 | int ret = 0; |
| 1570 | |
| 1571 | if (unlikely(protocol_failed(attr) || |
| 1572 | !attr[IPSET_ATTR_SETNAME] || |
| 1573 | !((attr[IPSET_ATTR_DATA] != NULL) ^ |
| 1574 | (attr[IPSET_ATTR_ADT] != NULL)) || |
| 1575 | (attr[IPSET_ATTR_DATA] && |
| 1576 | !flag_nested(attr[IPSET_ATTR_DATA])) || |
| 1577 | (attr[IPSET_ATTR_ADT] && |
| 1578 | (!flag_nested(attr[IPSET_ATTR_ADT]) || |
| 1579 | !attr[IPSET_ATTR_LINENO])))) |
| 1580 | return -IPSET_ERR_PROTOCOL; |
| 1581 | |
| 1582 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
| 1583 | if (!set) |
| 1584 | return -ENOENT; |
| 1585 | |
| 1586 | use_lineno = !!attr[IPSET_ATTR_LINENO]; |
| 1587 | if (attr[IPSET_ATTR_DATA]) { |
| 1588 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, |
| 1589 | attr[IPSET_ATTR_DATA], |
| 1590 | set->type->adt_policy)) |
| 1591 | return -IPSET_ERR_PROTOCOL; |
| 1592 | ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, flags, |
| 1593 | use_lineno); |
| 1594 | } else { |
| 1595 | int nla_rem; |
| 1596 | |
| 1597 | nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { |
| 1598 | memset(tb, 0, sizeof(*tb)); |
| 1599 | if (nla_type(nla) != IPSET_ATTR_DATA || |
| 1600 | !flag_nested(nla) || |
| 1601 | nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, |
| 1602 | set->type->adt_policy)) |
| 1603 | return -IPSET_ERR_PROTOCOL; |
| 1604 | ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, |
| 1605 | flags, use_lineno); |
| 1606 | if (ret < 0) |
| 1607 | return ret; |
| 1608 | } |
| 1609 | } |
| 1610 | return ret; |
| 1611 | } |
| 1612 | |
| 1613 | static int |
| 1614 | ip_set_utest(struct sock *ctnl, struct sk_buff *skb, |
| 1615 | const struct nlmsghdr *nlh, |
| 1616 | const struct nlattr * const attr[]) |
| 1617 | { |
| 1618 | struct ip_set_net *inst = ip_set_pernet(sock_net(ctnl)); |
| 1619 | struct ip_set *set; |
| 1620 | struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; |
| 1621 | int ret = 0; |
| 1622 | |
| 1623 | if (unlikely(protocol_failed(attr) || |
| 1624 | !attr[IPSET_ATTR_SETNAME] || |
| 1625 | !attr[IPSET_ATTR_DATA] || |
| 1626 | !flag_nested(attr[IPSET_ATTR_DATA]))) |
| 1627 | return -IPSET_ERR_PROTOCOL; |
| 1628 | |
| 1629 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
| 1630 | if (!set) |
| 1631 | return -ENOENT; |
| 1632 | |
| 1633 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA], |
| 1634 | set->type->adt_policy)) |
| 1635 | return -IPSET_ERR_PROTOCOL; |
| 1636 | |
| 1637 | rcu_read_lock_bh(); |
| 1638 | ret = set->variant->uadt(set, tb, IPSET_TEST, NULL, 0, 0); |
| 1639 | rcu_read_unlock_bh(); |
| 1640 | /* Userspace can't trigger element to be re-added */ |
| 1641 | if (ret == -EAGAIN) |
| 1642 | ret = 1; |
| 1643 | |
| 1644 | return ret > 0 ? 0 : -IPSET_ERR_EXIST; |
| 1645 | } |
| 1646 | |
| 1647 | /* Get headed data of a set */ |
| 1648 | |
| 1649 | static int |
| 1650 | ip_set_header(struct sock *ctnl, struct sk_buff *skb, |
| 1651 | const struct nlmsghdr *nlh, |
| 1652 | const struct nlattr * const attr[]) |
| 1653 | { |
| 1654 | struct ip_set_net *inst = ip_set_pernet(sock_net(ctnl)); |
| 1655 | const struct ip_set *set; |
| 1656 | struct sk_buff *skb2; |
| 1657 | struct nlmsghdr *nlh2; |
| 1658 | int ret = 0; |
| 1659 | |
| 1660 | if (unlikely(protocol_failed(attr) || |
| 1661 | !attr[IPSET_ATTR_SETNAME])) |
| 1662 | return -IPSET_ERR_PROTOCOL; |
| 1663 | |
| 1664 | set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); |
| 1665 | if (!set) |
| 1666 | return -ENOENT; |
| 1667 | |
| 1668 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 1669 | if (!skb2) |
| 1670 | return -ENOMEM; |
| 1671 | |
| 1672 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
| 1673 | IPSET_CMD_HEADER); |
| 1674 | if (!nlh2) |
| 1675 | goto nlmsg_failure; |
| 1676 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || |
| 1677 | nla_put_string(skb2, IPSET_ATTR_SETNAME, set->name) || |
| 1678 | nla_put_string(skb2, IPSET_ATTR_TYPENAME, set->type->name) || |
| 1679 | nla_put_u8(skb2, IPSET_ATTR_FAMILY, set->family) || |
| 1680 | nla_put_u8(skb2, IPSET_ATTR_REVISION, set->revision)) |
| 1681 | goto nla_put_failure; |
| 1682 | nlmsg_end(skb2, nlh2); |
| 1683 | |
| 1684 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
| 1685 | if (ret < 0) |
| 1686 | return ret; |
| 1687 | |
| 1688 | return 0; |
| 1689 | |
| 1690 | nla_put_failure: |
| 1691 | nlmsg_cancel(skb2, nlh2); |
| 1692 | nlmsg_failure: |
| 1693 | kfree_skb(skb2); |
| 1694 | return -EMSGSIZE; |
| 1695 | } |
| 1696 | |
| 1697 | /* Get type data */ |
| 1698 | |
| 1699 | static const struct nla_policy ip_set_type_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 1700 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 1701 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, |
| 1702 | .len = IPSET_MAXNAMELEN - 1 }, |
| 1703 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, |
| 1704 | }; |
| 1705 | |
| 1706 | static int |
| 1707 | ip_set_type(struct sock *ctnl, struct sk_buff *skb, |
| 1708 | const struct nlmsghdr *nlh, |
| 1709 | const struct nlattr * const attr[]) |
| 1710 | { |
| 1711 | struct sk_buff *skb2; |
| 1712 | struct nlmsghdr *nlh2; |
| 1713 | u8 family, min, max; |
| 1714 | const char *typename; |
| 1715 | int ret = 0; |
| 1716 | |
| 1717 | if (unlikely(protocol_failed(attr) || |
| 1718 | !attr[IPSET_ATTR_TYPENAME] || |
| 1719 | !attr[IPSET_ATTR_FAMILY])) |
| 1720 | return -IPSET_ERR_PROTOCOL; |
| 1721 | |
| 1722 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); |
| 1723 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); |
| 1724 | ret = find_set_type_minmax(typename, family, &min, &max); |
| 1725 | if (ret) |
| 1726 | return ret; |
| 1727 | |
| 1728 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 1729 | if (!skb2) |
| 1730 | return -ENOMEM; |
| 1731 | |
| 1732 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
| 1733 | IPSET_CMD_TYPE); |
| 1734 | if (!nlh2) |
| 1735 | goto nlmsg_failure; |
| 1736 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || |
| 1737 | nla_put_string(skb2, IPSET_ATTR_TYPENAME, typename) || |
| 1738 | nla_put_u8(skb2, IPSET_ATTR_FAMILY, family) || |
| 1739 | nla_put_u8(skb2, IPSET_ATTR_REVISION, max) || |
| 1740 | nla_put_u8(skb2, IPSET_ATTR_REVISION_MIN, min)) |
| 1741 | goto nla_put_failure; |
| 1742 | nlmsg_end(skb2, nlh2); |
| 1743 | |
| 1744 | pr_debug("Send TYPE, nlmsg_len: %u\n", nlh2->nlmsg_len); |
| 1745 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
| 1746 | if (ret < 0) |
| 1747 | return ret; |
| 1748 | |
| 1749 | return 0; |
| 1750 | |
| 1751 | nla_put_failure: |
| 1752 | nlmsg_cancel(skb2, nlh2); |
| 1753 | nlmsg_failure: |
| 1754 | kfree_skb(skb2); |
| 1755 | return -EMSGSIZE; |
| 1756 | } |
| 1757 | |
| 1758 | /* Get protocol version */ |
| 1759 | |
| 1760 | static const struct nla_policy |
| 1761 | ip_set_protocol_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 1762 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 1763 | }; |
| 1764 | |
| 1765 | static int |
| 1766 | ip_set_protocol(struct sock *ctnl, struct sk_buff *skb, |
| 1767 | const struct nlmsghdr *nlh, |
| 1768 | const struct nlattr * const attr[]) |
| 1769 | { |
| 1770 | struct sk_buff *skb2; |
| 1771 | struct nlmsghdr *nlh2; |
| 1772 | int ret = 0; |
| 1773 | |
| 1774 | if (unlikely(!attr[IPSET_ATTR_PROTOCOL])) |
| 1775 | return -IPSET_ERR_PROTOCOL; |
| 1776 | |
| 1777 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 1778 | if (!skb2) |
| 1779 | return -ENOMEM; |
| 1780 | |
| 1781 | nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
| 1782 | IPSET_CMD_PROTOCOL); |
| 1783 | if (!nlh2) |
| 1784 | goto nlmsg_failure; |
| 1785 | if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL)) |
| 1786 | goto nla_put_failure; |
| 1787 | nlmsg_end(skb2, nlh2); |
| 1788 | |
| 1789 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); |
| 1790 | if (ret < 0) |
| 1791 | return ret; |
| 1792 | |
| 1793 | return 0; |
| 1794 | |
| 1795 | nla_put_failure: |
| 1796 | nlmsg_cancel(skb2, nlh2); |
| 1797 | nlmsg_failure: |
| 1798 | kfree_skb(skb2); |
| 1799 | return -EMSGSIZE; |
| 1800 | } |
| 1801 | |
| 1802 | static const struct nfnl_callback ip_set_netlink_subsys_cb[IPSET_MSG_MAX] = { |
| 1803 | [IPSET_CMD_NONE] = { |
| 1804 | .call = ip_set_none, |
| 1805 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1806 | }, |
| 1807 | [IPSET_CMD_CREATE] = { |
| 1808 | .call = ip_set_create, |
| 1809 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1810 | .policy = ip_set_create_policy, |
| 1811 | }, |
| 1812 | [IPSET_CMD_DESTROY] = { |
| 1813 | .call = ip_set_destroy, |
| 1814 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1815 | .policy = ip_set_setname_policy, |
| 1816 | }, |
| 1817 | [IPSET_CMD_FLUSH] = { |
| 1818 | .call = ip_set_flush, |
| 1819 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1820 | .policy = ip_set_setname_policy, |
| 1821 | }, |
| 1822 | [IPSET_CMD_RENAME] = { |
| 1823 | .call = ip_set_rename, |
| 1824 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1825 | .policy = ip_set_setname2_policy, |
| 1826 | }, |
| 1827 | [IPSET_CMD_SWAP] = { |
| 1828 | .call = ip_set_swap, |
| 1829 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1830 | .policy = ip_set_setname2_policy, |
| 1831 | }, |
| 1832 | [IPSET_CMD_LIST] = { |
| 1833 | .call = ip_set_dump, |
| 1834 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1835 | .policy = ip_set_setname_policy, |
| 1836 | }, |
| 1837 | [IPSET_CMD_SAVE] = { |
| 1838 | .call = ip_set_dump, |
| 1839 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1840 | .policy = ip_set_setname_policy, |
| 1841 | }, |
| 1842 | [IPSET_CMD_ADD] = { |
| 1843 | .call = ip_set_uadd, |
| 1844 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1845 | .policy = ip_set_adt_policy, |
| 1846 | }, |
| 1847 | [IPSET_CMD_DEL] = { |
| 1848 | .call = ip_set_udel, |
| 1849 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1850 | .policy = ip_set_adt_policy, |
| 1851 | }, |
| 1852 | [IPSET_CMD_TEST] = { |
| 1853 | .call = ip_set_utest, |
| 1854 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1855 | .policy = ip_set_adt_policy, |
| 1856 | }, |
| 1857 | [IPSET_CMD_HEADER] = { |
| 1858 | .call = ip_set_header, |
| 1859 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1860 | .policy = ip_set_setname_policy, |
| 1861 | }, |
| 1862 | [IPSET_CMD_TYPE] = { |
| 1863 | .call = ip_set_type, |
| 1864 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1865 | .policy = ip_set_type_policy, |
| 1866 | }, |
| 1867 | [IPSET_CMD_PROTOCOL] = { |
| 1868 | .call = ip_set_protocol, |
| 1869 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1870 | .policy = ip_set_protocol_policy, |
| 1871 | }, |
| 1872 | }; |
| 1873 | |
| 1874 | static struct nfnetlink_subsystem ip_set_netlink_subsys __read_mostly = { |
| 1875 | .name = "ip_set", |
| 1876 | .subsys_id = NFNL_SUBSYS_IPSET, |
| 1877 | .cb_count = IPSET_MSG_MAX, |
| 1878 | .cb = ip_set_netlink_subsys_cb, |
| 1879 | }; |
| 1880 | |
| 1881 | /* Interface to iptables/ip6tables */ |
| 1882 | |
| 1883 | static int |
| 1884 | ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len) |
| 1885 | { |
| 1886 | unsigned int *op; |
| 1887 | void *data; |
| 1888 | int copylen = *len, ret = 0; |
| 1889 | struct net *net = sock_net(sk); |
| 1890 | struct ip_set_net *inst = ip_set_pernet(net); |
| 1891 | |
| 1892 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| 1893 | return -EPERM; |
| 1894 | if (optval != SO_IP_SET) |
| 1895 | return -EBADF; |
| 1896 | if (*len < sizeof(unsigned int)) |
| 1897 | return -EINVAL; |
| 1898 | |
| 1899 | data = vmalloc(*len); |
| 1900 | if (!data) |
| 1901 | return -ENOMEM; |
| 1902 | if (copy_from_user(data, user, *len) != 0) { |
| 1903 | ret = -EFAULT; |
| 1904 | goto done; |
| 1905 | } |
| 1906 | op = (unsigned int *)data; |
| 1907 | |
| 1908 | if (*op < IP_SET_OP_VERSION) { |
| 1909 | /* Check the version at the beginning of operations */ |
| 1910 | struct ip_set_req_version *req_version = data; |
| 1911 | |
| 1912 | if (*len < sizeof(struct ip_set_req_version)) { |
| 1913 | ret = -EINVAL; |
| 1914 | goto done; |
| 1915 | } |
| 1916 | |
| 1917 | if (req_version->version != IPSET_PROTOCOL) { |
| 1918 | ret = -EPROTO; |
| 1919 | goto done; |
| 1920 | } |
| 1921 | } |
| 1922 | |
| 1923 | switch (*op) { |
| 1924 | case IP_SET_OP_VERSION: { |
| 1925 | struct ip_set_req_version *req_version = data; |
| 1926 | |
| 1927 | if (*len != sizeof(struct ip_set_req_version)) { |
| 1928 | ret = -EINVAL; |
| 1929 | goto done; |
| 1930 | } |
| 1931 | |
| 1932 | req_version->version = IPSET_PROTOCOL; |
| 1933 | ret = copy_to_user(user, req_version, |
| 1934 | sizeof(struct ip_set_req_version)); |
| 1935 | goto done; |
| 1936 | } |
| 1937 | case IP_SET_OP_GET_BYNAME: { |
| 1938 | struct ip_set_req_get_set *req_get = data; |
| 1939 | ip_set_id_t id; |
| 1940 | |
| 1941 | if (*len != sizeof(struct ip_set_req_get_set)) { |
| 1942 | ret = -EINVAL; |
| 1943 | goto done; |
| 1944 | } |
| 1945 | req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; |
| 1946 | nfnl_lock(NFNL_SUBSYS_IPSET); |
| 1947 | find_set_and_id(inst, req_get->set.name, &id); |
| 1948 | req_get->set.index = id; |
| 1949 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
| 1950 | goto copy; |
| 1951 | } |
| 1952 | case IP_SET_OP_GET_FNAME: { |
| 1953 | struct ip_set_req_get_set_family *req_get = data; |
| 1954 | ip_set_id_t id; |
| 1955 | |
| 1956 | if (*len != sizeof(struct ip_set_req_get_set_family)) { |
| 1957 | ret = -EINVAL; |
| 1958 | goto done; |
| 1959 | } |
| 1960 | req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; |
| 1961 | nfnl_lock(NFNL_SUBSYS_IPSET); |
| 1962 | find_set_and_id(inst, req_get->set.name, &id); |
| 1963 | req_get->set.index = id; |
| 1964 | if (id != IPSET_INVALID_ID) |
| 1965 | req_get->family = ip_set(inst, id)->family; |
| 1966 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
| 1967 | goto copy; |
| 1968 | } |
| 1969 | case IP_SET_OP_GET_BYINDEX: { |
| 1970 | struct ip_set_req_get_set *req_get = data; |
| 1971 | struct ip_set *set; |
| 1972 | |
| 1973 | if (*len != sizeof(struct ip_set_req_get_set) || |
| 1974 | req_get->set.index >= inst->ip_set_max) { |
| 1975 | ret = -EINVAL; |
| 1976 | goto done; |
| 1977 | } |
| 1978 | nfnl_lock(NFNL_SUBSYS_IPSET); |
| 1979 | set = ip_set(inst, req_get->set.index); |
| 1980 | strncpy(req_get->set.name, set ? set->name : "", |
| 1981 | IPSET_MAXNAMELEN); |
| 1982 | nfnl_unlock(NFNL_SUBSYS_IPSET); |
| 1983 | goto copy; |
| 1984 | } |
| 1985 | default: |
| 1986 | ret = -EBADMSG; |
| 1987 | goto done; |
| 1988 | } /* end of switch(op) */ |
| 1989 | |
| 1990 | copy: |
| 1991 | ret = copy_to_user(user, data, copylen); |
| 1992 | |
| 1993 | done: |
| 1994 | vfree(data); |
| 1995 | if (ret > 0) |
| 1996 | ret = 0; |
| 1997 | return ret; |
| 1998 | } |
| 1999 | |
| 2000 | static struct nf_sockopt_ops so_set __read_mostly = { |
| 2001 | .pf = PF_INET, |
| 2002 | .get_optmin = SO_IP_SET, |
| 2003 | .get_optmax = SO_IP_SET + 1, |
| 2004 | .get = &ip_set_sockfn_get, |
| 2005 | .owner = THIS_MODULE, |
| 2006 | }; |
| 2007 | |
| 2008 | static int __net_init |
| 2009 | ip_set_net_init(struct net *net) |
| 2010 | { |
| 2011 | struct ip_set_net *inst = ip_set_pernet(net); |
| 2012 | struct ip_set **list; |
| 2013 | |
| 2014 | inst->ip_set_max = max_sets ? max_sets : CONFIG_IP_SET_MAX; |
| 2015 | if (inst->ip_set_max >= IPSET_INVALID_ID) |
| 2016 | inst->ip_set_max = IPSET_INVALID_ID - 1; |
| 2017 | |
| 2018 | list = kcalloc(inst->ip_set_max, sizeof(struct ip_set *), GFP_KERNEL); |
| 2019 | if (!list) |
| 2020 | return -ENOMEM; |
| 2021 | inst->is_deleted = false; |
| 2022 | inst->is_destroyed = false; |
| 2023 | rcu_assign_pointer(inst->ip_set_list, list); |
| 2024 | return 0; |
| 2025 | } |
| 2026 | |
| 2027 | static void __net_exit |
| 2028 | ip_set_net_exit(struct net *net) |
| 2029 | { |
| 2030 | struct ip_set_net *inst = ip_set_pernet(net); |
| 2031 | |
| 2032 | struct ip_set *set = NULL; |
| 2033 | ip_set_id_t i; |
| 2034 | |
| 2035 | inst->is_deleted = true; /* flag for ip_set_nfnl_put */ |
| 2036 | |
| 2037 | for (i = 0; i < inst->ip_set_max; i++) { |
| 2038 | set = ip_set(inst, i); |
| 2039 | if (set) { |
| 2040 | ip_set(inst, i) = NULL; |
| 2041 | ip_set_destroy_set(set); |
| 2042 | } |
| 2043 | } |
| 2044 | kfree(rcu_dereference_protected(inst->ip_set_list, 1)); |
| 2045 | } |
| 2046 | |
| 2047 | static struct pernet_operations ip_set_net_ops = { |
| 2048 | .init = ip_set_net_init, |
| 2049 | .exit = ip_set_net_exit, |
| 2050 | .id = &ip_set_net_id, |
| 2051 | .size = sizeof(struct ip_set_net) |
| 2052 | }; |
| 2053 | |
| 2054 | static int __init |
| 2055 | ip_set_init(void) |
| 2056 | { |
| 2057 | int ret = nfnetlink_subsys_register(&ip_set_netlink_subsys); |
| 2058 | |
| 2059 | if (ret != 0) { |
| 2060 | pr_err("ip_set: cannot register with nfnetlink.\n"); |
| 2061 | return ret; |
| 2062 | } |
| 2063 | ret = nf_register_sockopt(&so_set); |
| 2064 | if (ret != 0) { |
| 2065 | pr_err("SO_SET registry failed: %d\n", ret); |
| 2066 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); |
| 2067 | return ret; |
| 2068 | } |
| 2069 | ret = register_pernet_subsys(&ip_set_net_ops); |
| 2070 | if (ret) { |
| 2071 | pr_err("ip_set: cannot register pernet_subsys.\n"); |
| 2072 | nf_unregister_sockopt(&so_set); |
| 2073 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); |
| 2074 | return ret; |
| 2075 | } |
| 2076 | pr_info("ip_set: protocol %u\n", IPSET_PROTOCOL); |
| 2077 | return 0; |
| 2078 | } |
| 2079 | |
| 2080 | static void __exit |
| 2081 | ip_set_fini(void) |
| 2082 | { |
| 2083 | unregister_pernet_subsys(&ip_set_net_ops); |
| 2084 | nf_unregister_sockopt(&so_set); |
| 2085 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); |
| 2086 | pr_debug("these are the famous last words\n"); |
| 2087 | } |
| 2088 | |
| 2089 | module_init(ip_set_init); |
| 2090 | module_exit(ip_set_fini); |