Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1 | /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu> |
| 2 | * Patrick Schaaf <bof@bof.de> |
| 3 | * Copyright (C) 2003-2011 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/netlink.h> |
| 19 | #include <linux/rculist.h> |
| 20 | #include <linux/version.h> |
| 21 | #include <net/netlink.h> |
| 22 | |
| 23 | #include <linux/netfilter.h> |
| 24 | #include <linux/netfilter/nfnetlink.h> |
| 25 | #include <linux/netfilter/ipset/ip_set.h> |
| 26 | |
| 27 | static LIST_HEAD(ip_set_type_list); /* all registered set types */ |
| 28 | static DEFINE_MUTEX(ip_set_type_mutex); /* protects ip_set_type_list */ |
| 29 | |
| 30 | static struct ip_set **ip_set_list; /* all individual sets */ |
| 31 | static ip_set_id_t ip_set_max = CONFIG_IP_SET_MAX; /* max number of sets */ |
| 32 | |
| 33 | #define STREQ(a, b) (strncmp(a, b, IPSET_MAXNAMELEN) == 0) |
| 34 | |
| 35 | static unsigned int max_sets; |
| 36 | |
| 37 | module_param(max_sets, int, 0600); |
| 38 | MODULE_PARM_DESC(max_sets, "maximal number of sets"); |
| 39 | MODULE_LICENSE("GPL"); |
| 40 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); |
| 41 | MODULE_DESCRIPTION("core IP set support"); |
| 42 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_IPSET); |
| 43 | |
| 44 | /* |
| 45 | * The set types are implemented in modules and registered set types |
| 46 | * can be found in ip_set_type_list. Adding/deleting types is |
| 47 | * serialized by ip_set_type_mutex. |
| 48 | */ |
| 49 | |
| 50 | static inline void |
| 51 | ip_set_type_lock(void) |
| 52 | { |
| 53 | mutex_lock(&ip_set_type_mutex); |
| 54 | } |
| 55 | |
| 56 | static inline void |
| 57 | ip_set_type_unlock(void) |
| 58 | { |
| 59 | mutex_unlock(&ip_set_type_mutex); |
| 60 | } |
| 61 | |
| 62 | /* Register and deregister settype */ |
| 63 | |
| 64 | static struct ip_set_type * |
| 65 | find_set_type(const char *name, u8 family, u8 revision) |
| 66 | { |
| 67 | struct ip_set_type *type; |
| 68 | |
| 69 | list_for_each_entry_rcu(type, &ip_set_type_list, list) |
| 70 | if (STREQ(type->name, name) && |
| 71 | (type->family == family || type->family == AF_UNSPEC) && |
| 72 | type->revision == revision) |
| 73 | return type; |
| 74 | return NULL; |
| 75 | } |
| 76 | |
| 77 | /* Unlock, try to load a set type module and lock again */ |
| 78 | static int |
| 79 | try_to_load_type(const char *name) |
| 80 | { |
| 81 | nfnl_unlock(); |
| 82 | pr_debug("try to load ip_set_%s\n", name); |
| 83 | if (request_module("ip_set_%s", name) < 0) { |
| 84 | pr_warning("Can't find ip_set type %s\n", name); |
| 85 | nfnl_lock(); |
| 86 | return -IPSET_ERR_FIND_TYPE; |
| 87 | } |
| 88 | nfnl_lock(); |
| 89 | return -EAGAIN; |
| 90 | } |
| 91 | |
| 92 | /* Find a set type and reference it */ |
| 93 | static int |
| 94 | find_set_type_get(const char *name, u8 family, u8 revision, |
| 95 | struct ip_set_type **found) |
| 96 | { |
Jozsef Kadlecsik | 5c1aba4 | 2011-03-20 15:35:01 +0100 | [diff] [blame^] | 97 | struct ip_set_type *type; |
| 98 | int err; |
| 99 | |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 100 | rcu_read_lock(); |
| 101 | *found = find_set_type(name, family, revision); |
| 102 | if (*found) { |
Jozsef Kadlecsik | 5c1aba4 | 2011-03-20 15:35:01 +0100 | [diff] [blame^] | 103 | err = !try_module_get((*found)->me) ? -EFAULT : 0; |
| 104 | goto unlock; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 105 | } |
Jozsef Kadlecsik | 5c1aba4 | 2011-03-20 15:35:01 +0100 | [diff] [blame^] | 106 | /* Make sure the type is loaded but we don't support the revision */ |
| 107 | list_for_each_entry_rcu(type, &ip_set_type_list, list) |
| 108 | if (STREQ(type->name, name)) { |
| 109 | err = -IPSET_ERR_FIND_TYPE; |
| 110 | goto unlock; |
| 111 | } |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 112 | rcu_read_unlock(); |
| 113 | |
| 114 | return try_to_load_type(name); |
Jozsef Kadlecsik | 5c1aba4 | 2011-03-20 15:35:01 +0100 | [diff] [blame^] | 115 | |
| 116 | unlock: |
| 117 | rcu_read_unlock(); |
| 118 | return err; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | /* Find a given set type by name and family. |
| 122 | * If we succeeded, the supported minimal and maximum revisions are |
| 123 | * filled out. |
| 124 | */ |
| 125 | static int |
| 126 | find_set_type_minmax(const char *name, u8 family, u8 *min, u8 *max) |
| 127 | { |
| 128 | struct ip_set_type *type; |
| 129 | bool found = false; |
| 130 | |
Jozsef Kadlecsik | 5c1aba4 | 2011-03-20 15:35:01 +0100 | [diff] [blame^] | 131 | *min = 255; *max = 0; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 132 | rcu_read_lock(); |
| 133 | list_for_each_entry_rcu(type, &ip_set_type_list, list) |
| 134 | if (STREQ(type->name, name) && |
| 135 | (type->family == family || type->family == AF_UNSPEC)) { |
| 136 | found = true; |
| 137 | if (type->revision < *min) |
| 138 | *min = type->revision; |
Jozsef Kadlecsik | 5c1aba4 | 2011-03-20 15:35:01 +0100 | [diff] [blame^] | 139 | if (type->revision > *max) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 140 | *max = type->revision; |
| 141 | } |
| 142 | rcu_read_unlock(); |
| 143 | if (found) |
| 144 | return 0; |
| 145 | |
| 146 | return try_to_load_type(name); |
| 147 | } |
| 148 | |
| 149 | #define family_name(f) ((f) == AF_INET ? "inet" : \ |
| 150 | (f) == AF_INET6 ? "inet6" : "any") |
| 151 | |
| 152 | /* Register a set type structure. The type is identified by |
| 153 | * the unique triple of name, family and revision. |
| 154 | */ |
| 155 | int |
| 156 | ip_set_type_register(struct ip_set_type *type) |
| 157 | { |
| 158 | int ret = 0; |
| 159 | |
| 160 | if (type->protocol != IPSET_PROTOCOL) { |
| 161 | pr_warning("ip_set type %s, family %s, revision %u uses " |
| 162 | "wrong protocol version %u (want %u)\n", |
| 163 | type->name, family_name(type->family), |
| 164 | type->revision, type->protocol, IPSET_PROTOCOL); |
| 165 | return -EINVAL; |
| 166 | } |
| 167 | |
| 168 | ip_set_type_lock(); |
| 169 | if (find_set_type(type->name, type->family, type->revision)) { |
| 170 | /* Duplicate! */ |
| 171 | pr_warning("ip_set type %s, family %s, revision %u " |
| 172 | "already registered!\n", type->name, |
| 173 | family_name(type->family), type->revision); |
| 174 | ret = -EINVAL; |
| 175 | goto unlock; |
| 176 | } |
| 177 | list_add_rcu(&type->list, &ip_set_type_list); |
| 178 | pr_debug("type %s, family %s, revision %u registered.\n", |
| 179 | type->name, family_name(type->family), type->revision); |
| 180 | unlock: |
| 181 | ip_set_type_unlock(); |
| 182 | return ret; |
| 183 | } |
| 184 | EXPORT_SYMBOL_GPL(ip_set_type_register); |
| 185 | |
| 186 | /* Unregister a set type. There's a small race with ip_set_create */ |
| 187 | void |
| 188 | ip_set_type_unregister(struct ip_set_type *type) |
| 189 | { |
| 190 | ip_set_type_lock(); |
| 191 | if (!find_set_type(type->name, type->family, type->revision)) { |
| 192 | pr_warning("ip_set type %s, family %s, revision %u " |
| 193 | "not registered\n", type->name, |
| 194 | family_name(type->family), type->revision); |
| 195 | goto unlock; |
| 196 | } |
| 197 | list_del_rcu(&type->list); |
| 198 | pr_debug("type %s, family %s, revision %u unregistered.\n", |
| 199 | type->name, family_name(type->family), type->revision); |
| 200 | unlock: |
| 201 | ip_set_type_unlock(); |
| 202 | |
| 203 | synchronize_rcu(); |
| 204 | } |
| 205 | EXPORT_SYMBOL_GPL(ip_set_type_unregister); |
| 206 | |
| 207 | /* Utility functions */ |
| 208 | void * |
| 209 | ip_set_alloc(size_t size) |
| 210 | { |
| 211 | void *members = NULL; |
| 212 | |
| 213 | if (size < KMALLOC_MAX_SIZE) |
| 214 | members = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); |
| 215 | |
| 216 | if (members) { |
| 217 | pr_debug("%p: allocated with kmalloc\n", members); |
| 218 | return members; |
| 219 | } |
| 220 | |
| 221 | members = vzalloc(size); |
| 222 | if (!members) |
| 223 | return NULL; |
| 224 | pr_debug("%p: allocated with vmalloc\n", members); |
| 225 | |
| 226 | return members; |
| 227 | } |
| 228 | EXPORT_SYMBOL_GPL(ip_set_alloc); |
| 229 | |
| 230 | void |
| 231 | ip_set_free(void *members) |
| 232 | { |
| 233 | pr_debug("%p: free with %s\n", members, |
| 234 | is_vmalloc_addr(members) ? "vfree" : "kfree"); |
| 235 | if (is_vmalloc_addr(members)) |
| 236 | vfree(members); |
| 237 | else |
| 238 | kfree(members); |
| 239 | } |
| 240 | EXPORT_SYMBOL_GPL(ip_set_free); |
| 241 | |
| 242 | static inline bool |
| 243 | flag_nested(const struct nlattr *nla) |
| 244 | { |
| 245 | return nla->nla_type & NLA_F_NESTED; |
| 246 | } |
| 247 | |
| 248 | static const struct nla_policy ipaddr_policy[IPSET_ATTR_IPADDR_MAX + 1] = { |
| 249 | [IPSET_ATTR_IPADDR_IPV4] = { .type = NLA_U32 }, |
| 250 | [IPSET_ATTR_IPADDR_IPV6] = { .type = NLA_BINARY, |
| 251 | .len = sizeof(struct in6_addr) }, |
| 252 | }; |
| 253 | |
| 254 | int |
| 255 | ip_set_get_ipaddr4(struct nlattr *nla, __be32 *ipaddr) |
| 256 | { |
| 257 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX+1]; |
| 258 | |
| 259 | if (unlikely(!flag_nested(nla))) |
| 260 | return -IPSET_ERR_PROTOCOL; |
Patrick McHardy | 8da560c | 2011-02-01 16:27:25 +0100 | [diff] [blame] | 261 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 262 | return -IPSET_ERR_PROTOCOL; |
| 263 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV4))) |
| 264 | return -IPSET_ERR_PROTOCOL; |
| 265 | |
| 266 | *ipaddr = nla_get_be32(tb[IPSET_ATTR_IPADDR_IPV4]); |
| 267 | return 0; |
| 268 | } |
| 269 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr4); |
| 270 | |
| 271 | int |
| 272 | ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr) |
| 273 | { |
| 274 | struct nlattr *tb[IPSET_ATTR_IPADDR_MAX+1]; |
| 275 | |
| 276 | if (unlikely(!flag_nested(nla))) |
| 277 | return -IPSET_ERR_PROTOCOL; |
| 278 | |
Patrick McHardy | 8da560c | 2011-02-01 16:27:25 +0100 | [diff] [blame] | 279 | if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 280 | return -IPSET_ERR_PROTOCOL; |
| 281 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV6))) |
| 282 | return -IPSET_ERR_PROTOCOL; |
| 283 | |
| 284 | memcpy(ipaddr, nla_data(tb[IPSET_ATTR_IPADDR_IPV6]), |
| 285 | sizeof(struct in6_addr)); |
| 286 | return 0; |
| 287 | } |
| 288 | EXPORT_SYMBOL_GPL(ip_set_get_ipaddr6); |
| 289 | |
| 290 | /* |
| 291 | * Creating/destroying/renaming/swapping affect the existence and |
| 292 | * the properties of a set. All of these can be executed from userspace |
| 293 | * only and serialized by the nfnl mutex indirectly from nfnetlink. |
| 294 | * |
| 295 | * Sets are identified by their index in ip_set_list and the index |
| 296 | * is used by the external references (set/SET netfilter modules). |
| 297 | * |
| 298 | * The set behind an index may change by swapping only, from userspace. |
| 299 | */ |
| 300 | |
| 301 | static inline void |
| 302 | __ip_set_get(ip_set_id_t index) |
| 303 | { |
| 304 | atomic_inc(&ip_set_list[index]->ref); |
| 305 | } |
| 306 | |
| 307 | static inline void |
| 308 | __ip_set_put(ip_set_id_t index) |
| 309 | { |
| 310 | atomic_dec(&ip_set_list[index]->ref); |
| 311 | } |
| 312 | |
| 313 | /* |
| 314 | * Add, del and test set entries from kernel. |
| 315 | * |
| 316 | * The set behind the index must exist and must be referenced |
| 317 | * so it can't be destroyed (or changed) under our foot. |
| 318 | */ |
| 319 | |
| 320 | int |
| 321 | ip_set_test(ip_set_id_t index, const struct sk_buff *skb, |
| 322 | u8 family, u8 dim, u8 flags) |
| 323 | { |
| 324 | struct ip_set *set = ip_set_list[index]; |
| 325 | int ret = 0; |
| 326 | |
| 327 | BUG_ON(set == NULL || atomic_read(&set->ref) == 0); |
| 328 | pr_debug("set %s, index %u\n", set->name, index); |
| 329 | |
| 330 | if (dim < set->type->dimension || |
| 331 | !(family == set->family || set->family == AF_UNSPEC)) |
| 332 | return 0; |
| 333 | |
| 334 | read_lock_bh(&set->lock); |
| 335 | ret = set->variant->kadt(set, skb, IPSET_TEST, family, dim, flags); |
| 336 | read_unlock_bh(&set->lock); |
| 337 | |
| 338 | if (ret == -EAGAIN) { |
| 339 | /* Type requests element to be completed */ |
| 340 | pr_debug("element must be competed, ADD is triggered\n"); |
| 341 | write_lock_bh(&set->lock); |
| 342 | set->variant->kadt(set, skb, IPSET_ADD, family, dim, flags); |
| 343 | write_unlock_bh(&set->lock); |
| 344 | ret = 1; |
| 345 | } |
| 346 | |
| 347 | /* Convert error codes to nomatch */ |
| 348 | return (ret < 0 ? 0 : ret); |
| 349 | } |
| 350 | EXPORT_SYMBOL_GPL(ip_set_test); |
| 351 | |
| 352 | int |
| 353 | ip_set_add(ip_set_id_t index, const struct sk_buff *skb, |
| 354 | u8 family, u8 dim, u8 flags) |
| 355 | { |
| 356 | struct ip_set *set = ip_set_list[index]; |
| 357 | int ret; |
| 358 | |
| 359 | BUG_ON(set == NULL || atomic_read(&set->ref) == 0); |
| 360 | pr_debug("set %s, index %u\n", set->name, index); |
| 361 | |
| 362 | if (dim < set->type->dimension || |
| 363 | !(family == set->family || set->family == AF_UNSPEC)) |
| 364 | return 0; |
| 365 | |
| 366 | write_lock_bh(&set->lock); |
| 367 | ret = set->variant->kadt(set, skb, IPSET_ADD, family, dim, flags); |
| 368 | write_unlock_bh(&set->lock); |
| 369 | |
| 370 | return ret; |
| 371 | } |
| 372 | EXPORT_SYMBOL_GPL(ip_set_add); |
| 373 | |
| 374 | int |
| 375 | ip_set_del(ip_set_id_t index, const struct sk_buff *skb, |
| 376 | u8 family, u8 dim, u8 flags) |
| 377 | { |
| 378 | struct ip_set *set = ip_set_list[index]; |
| 379 | int ret = 0; |
| 380 | |
| 381 | BUG_ON(set == NULL || atomic_read(&set->ref) == 0); |
| 382 | pr_debug("set %s, index %u\n", set->name, index); |
| 383 | |
| 384 | if (dim < set->type->dimension || |
| 385 | !(family == set->family || set->family == AF_UNSPEC)) |
| 386 | return 0; |
| 387 | |
| 388 | write_lock_bh(&set->lock); |
| 389 | ret = set->variant->kadt(set, skb, IPSET_DEL, family, dim, flags); |
| 390 | write_unlock_bh(&set->lock); |
| 391 | |
| 392 | return ret; |
| 393 | } |
| 394 | EXPORT_SYMBOL_GPL(ip_set_del); |
| 395 | |
| 396 | /* |
| 397 | * Find set by name, reference it once. The reference makes sure the |
| 398 | * thing pointed to, does not go away under our feet. |
| 399 | * |
| 400 | * The nfnl mutex must already be activated. |
| 401 | */ |
| 402 | ip_set_id_t |
| 403 | ip_set_get_byname(const char *name, struct ip_set **set) |
| 404 | { |
| 405 | ip_set_id_t i, index = IPSET_INVALID_ID; |
| 406 | struct ip_set *s; |
| 407 | |
| 408 | for (i = 0; i < ip_set_max; i++) { |
| 409 | s = ip_set_list[i]; |
| 410 | if (s != NULL && STREQ(s->name, name)) { |
| 411 | __ip_set_get(i); |
| 412 | index = i; |
| 413 | *set = s; |
| 414 | } |
| 415 | } |
| 416 | |
| 417 | return index; |
| 418 | } |
| 419 | EXPORT_SYMBOL_GPL(ip_set_get_byname); |
| 420 | |
| 421 | /* |
| 422 | * If the given set pointer points to a valid set, decrement |
| 423 | * reference count by 1. The caller shall not assume the index |
| 424 | * to be valid, after calling this function. |
| 425 | * |
| 426 | * The nfnl mutex must already be activated. |
| 427 | */ |
| 428 | void |
| 429 | ip_set_put_byindex(ip_set_id_t index) |
| 430 | { |
| 431 | if (ip_set_list[index] != NULL) { |
| 432 | BUG_ON(atomic_read(&ip_set_list[index]->ref) == 0); |
| 433 | __ip_set_put(index); |
| 434 | } |
| 435 | } |
| 436 | EXPORT_SYMBOL_GPL(ip_set_put_byindex); |
| 437 | |
| 438 | /* |
| 439 | * Get the name of a set behind a set index. |
| 440 | * We assume the set is referenced, so it does exist and |
| 441 | * can't be destroyed. The set cannot be renamed due to |
| 442 | * the referencing either. |
| 443 | * |
| 444 | * The nfnl mutex must already be activated. |
| 445 | */ |
| 446 | const char * |
| 447 | ip_set_name_byindex(ip_set_id_t index) |
| 448 | { |
| 449 | const struct ip_set *set = ip_set_list[index]; |
| 450 | |
| 451 | BUG_ON(set == NULL); |
| 452 | BUG_ON(atomic_read(&set->ref) == 0); |
| 453 | |
| 454 | /* Referenced, so it's safe */ |
| 455 | return set->name; |
| 456 | } |
| 457 | EXPORT_SYMBOL_GPL(ip_set_name_byindex); |
| 458 | |
| 459 | /* |
| 460 | * Routines to call by external subsystems, which do not |
| 461 | * call nfnl_lock for us. |
| 462 | */ |
| 463 | |
| 464 | /* |
| 465 | * Find set by name, reference it once. The reference makes sure the |
| 466 | * thing pointed to, does not go away under our feet. |
| 467 | * |
| 468 | * The nfnl mutex is used in the function. |
| 469 | */ |
| 470 | ip_set_id_t |
| 471 | ip_set_nfnl_get(const char *name) |
| 472 | { |
| 473 | struct ip_set *s; |
| 474 | ip_set_id_t index; |
| 475 | |
| 476 | nfnl_lock(); |
| 477 | index = ip_set_get_byname(name, &s); |
| 478 | nfnl_unlock(); |
| 479 | |
| 480 | return index; |
| 481 | } |
| 482 | EXPORT_SYMBOL_GPL(ip_set_nfnl_get); |
| 483 | |
| 484 | /* |
| 485 | * Find set by index, reference it once. The reference makes sure the |
| 486 | * thing pointed to, does not go away under our feet. |
| 487 | * |
| 488 | * The nfnl mutex is used in the function. |
| 489 | */ |
| 490 | ip_set_id_t |
| 491 | ip_set_nfnl_get_byindex(ip_set_id_t index) |
| 492 | { |
| 493 | if (index > ip_set_max) |
| 494 | return IPSET_INVALID_ID; |
| 495 | |
| 496 | nfnl_lock(); |
| 497 | if (ip_set_list[index]) |
| 498 | __ip_set_get(index); |
| 499 | else |
| 500 | index = IPSET_INVALID_ID; |
| 501 | nfnl_unlock(); |
| 502 | |
| 503 | return index; |
| 504 | } |
| 505 | EXPORT_SYMBOL_GPL(ip_set_nfnl_get_byindex); |
| 506 | |
| 507 | /* |
| 508 | * If the given set pointer points to a valid set, decrement |
| 509 | * reference count by 1. The caller shall not assume the index |
| 510 | * to be valid, after calling this function. |
| 511 | * |
| 512 | * The nfnl mutex is used in the function. |
| 513 | */ |
| 514 | void |
| 515 | ip_set_nfnl_put(ip_set_id_t index) |
| 516 | { |
| 517 | nfnl_lock(); |
| 518 | if (ip_set_list[index] != NULL) { |
| 519 | BUG_ON(atomic_read(&ip_set_list[index]->ref) == 0); |
| 520 | __ip_set_put(index); |
| 521 | } |
| 522 | nfnl_unlock(); |
| 523 | } |
| 524 | EXPORT_SYMBOL_GPL(ip_set_nfnl_put); |
| 525 | |
| 526 | /* |
| 527 | * Communication protocol with userspace over netlink. |
| 528 | * |
| 529 | * We already locked by nfnl_lock. |
| 530 | */ |
| 531 | |
| 532 | static inline bool |
| 533 | protocol_failed(const struct nlattr * const tb[]) |
| 534 | { |
| 535 | return !tb[IPSET_ATTR_PROTOCOL] || |
| 536 | nla_get_u8(tb[IPSET_ATTR_PROTOCOL]) != IPSET_PROTOCOL; |
| 537 | } |
| 538 | |
| 539 | static inline u32 |
| 540 | flag_exist(const struct nlmsghdr *nlh) |
| 541 | { |
| 542 | return nlh->nlmsg_flags & NLM_F_EXCL ? 0 : IPSET_FLAG_EXIST; |
| 543 | } |
| 544 | |
| 545 | static struct nlmsghdr * |
| 546 | start_msg(struct sk_buff *skb, u32 pid, u32 seq, unsigned int flags, |
| 547 | enum ipset_cmd cmd) |
| 548 | { |
| 549 | struct nlmsghdr *nlh; |
| 550 | struct nfgenmsg *nfmsg; |
| 551 | |
| 552 | nlh = nlmsg_put(skb, pid, seq, cmd | (NFNL_SUBSYS_IPSET << 8), |
| 553 | sizeof(*nfmsg), flags); |
| 554 | if (nlh == NULL) |
| 555 | return NULL; |
| 556 | |
| 557 | nfmsg = nlmsg_data(nlh); |
| 558 | nfmsg->nfgen_family = AF_INET; |
| 559 | nfmsg->version = NFNETLINK_V0; |
| 560 | nfmsg->res_id = 0; |
| 561 | |
| 562 | return nlh; |
| 563 | } |
| 564 | |
| 565 | /* Create a set */ |
| 566 | |
| 567 | static const struct nla_policy ip_set_create_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 568 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 569 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, |
| 570 | .len = IPSET_MAXNAMELEN - 1 }, |
| 571 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, |
| 572 | .len = IPSET_MAXNAMELEN - 1}, |
| 573 | [IPSET_ATTR_REVISION] = { .type = NLA_U8 }, |
| 574 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, |
| 575 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, |
| 576 | }; |
| 577 | |
| 578 | static ip_set_id_t |
| 579 | find_set_id(const char *name) |
| 580 | { |
| 581 | ip_set_id_t i, index = IPSET_INVALID_ID; |
| 582 | const struct ip_set *set; |
| 583 | |
| 584 | for (i = 0; index == IPSET_INVALID_ID && i < ip_set_max; i++) { |
| 585 | set = ip_set_list[i]; |
| 586 | if (set != NULL && STREQ(set->name, name)) |
| 587 | index = i; |
| 588 | } |
| 589 | return index; |
| 590 | } |
| 591 | |
| 592 | static inline struct ip_set * |
| 593 | find_set(const char *name) |
| 594 | { |
| 595 | ip_set_id_t index = find_set_id(name); |
| 596 | |
| 597 | return index == IPSET_INVALID_ID ? NULL : ip_set_list[index]; |
| 598 | } |
| 599 | |
| 600 | static int |
| 601 | find_free_id(const char *name, ip_set_id_t *index, struct ip_set **set) |
| 602 | { |
| 603 | ip_set_id_t i; |
| 604 | |
| 605 | *index = IPSET_INVALID_ID; |
| 606 | for (i = 0; i < ip_set_max; i++) { |
| 607 | if (ip_set_list[i] == NULL) { |
| 608 | if (*index == IPSET_INVALID_ID) |
| 609 | *index = i; |
| 610 | } else if (STREQ(name, ip_set_list[i]->name)) { |
| 611 | /* Name clash */ |
| 612 | *set = ip_set_list[i]; |
| 613 | return -EEXIST; |
| 614 | } |
| 615 | } |
| 616 | if (*index == IPSET_INVALID_ID) |
| 617 | /* No free slot remained */ |
| 618 | return -IPSET_ERR_MAX_SETS; |
| 619 | return 0; |
| 620 | } |
| 621 | |
| 622 | static int |
| 623 | ip_set_create(struct sock *ctnl, struct sk_buff *skb, |
| 624 | const struct nlmsghdr *nlh, |
| 625 | const struct nlattr * const attr[]) |
| 626 | { |
Shan Wei | 9846ada | 2011-03-08 15:37:27 +0100 | [diff] [blame] | 627 | struct ip_set *set, *clash = NULL; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 628 | ip_set_id_t index = IPSET_INVALID_ID; |
| 629 | struct nlattr *tb[IPSET_ATTR_CREATE_MAX+1] = {}; |
| 630 | const char *name, *typename; |
| 631 | u8 family, revision; |
| 632 | u32 flags = flag_exist(nlh); |
| 633 | int ret = 0; |
| 634 | |
| 635 | if (unlikely(protocol_failed(attr) || |
| 636 | attr[IPSET_ATTR_SETNAME] == NULL || |
| 637 | attr[IPSET_ATTR_TYPENAME] == NULL || |
| 638 | attr[IPSET_ATTR_REVISION] == NULL || |
| 639 | attr[IPSET_ATTR_FAMILY] == NULL || |
| 640 | (attr[IPSET_ATTR_DATA] != NULL && |
| 641 | !flag_nested(attr[IPSET_ATTR_DATA])))) |
| 642 | return -IPSET_ERR_PROTOCOL; |
| 643 | |
| 644 | name = nla_data(attr[IPSET_ATTR_SETNAME]); |
| 645 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); |
| 646 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); |
| 647 | revision = nla_get_u8(attr[IPSET_ATTR_REVISION]); |
| 648 | pr_debug("setname: %s, typename: %s, family: %s, revision: %u\n", |
| 649 | name, typename, family_name(family), revision); |
| 650 | |
| 651 | /* |
| 652 | * First, and without any locks, allocate and initialize |
| 653 | * a normal base set structure. |
| 654 | */ |
| 655 | set = kzalloc(sizeof(struct ip_set), GFP_KERNEL); |
| 656 | if (!set) |
| 657 | return -ENOMEM; |
| 658 | rwlock_init(&set->lock); |
| 659 | strlcpy(set->name, name, IPSET_MAXNAMELEN); |
| 660 | atomic_set(&set->ref, 0); |
| 661 | set->family = family; |
| 662 | |
| 663 | /* |
| 664 | * Next, check that we know the type, and take |
| 665 | * a reference on the type, to make sure it stays available |
| 666 | * while constructing our new set. |
| 667 | * |
| 668 | * After referencing the type, we try to create the type |
| 669 | * specific part of the set without holding any locks. |
| 670 | */ |
| 671 | ret = find_set_type_get(typename, family, revision, &(set->type)); |
| 672 | if (ret) |
| 673 | goto out; |
| 674 | |
| 675 | /* |
| 676 | * Without holding any locks, create private part. |
| 677 | */ |
| 678 | if (attr[IPSET_ATTR_DATA] && |
Patrick McHardy | 8da560c | 2011-02-01 16:27:25 +0100 | [diff] [blame] | 679 | nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA], |
| 680 | set->type->create_policy)) { |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 681 | ret = -IPSET_ERR_PROTOCOL; |
| 682 | goto put_out; |
| 683 | } |
| 684 | |
| 685 | ret = set->type->create(set, tb, flags); |
| 686 | if (ret != 0) |
| 687 | goto put_out; |
| 688 | |
| 689 | /* BTW, ret==0 here. */ |
| 690 | |
| 691 | /* |
| 692 | * Here, we have a valid, constructed set and we are protected |
| 693 | * by nfnl_lock. Find the first free index in ip_set_list and |
| 694 | * check clashing. |
| 695 | */ |
| 696 | if ((ret = find_free_id(set->name, &index, &clash)) != 0) { |
| 697 | /* If this is the same set and requested, ignore error */ |
| 698 | if (ret == -EEXIST && |
| 699 | (flags & IPSET_FLAG_EXIST) && |
| 700 | STREQ(set->type->name, clash->type->name) && |
| 701 | set->type->family == clash->type->family && |
| 702 | set->type->revision == clash->type->revision && |
| 703 | set->variant->same_set(set, clash)) |
| 704 | ret = 0; |
| 705 | goto cleanup; |
| 706 | } |
| 707 | |
| 708 | /* |
| 709 | * Finally! Add our shiny new set to the list, and be done. |
| 710 | */ |
| 711 | pr_debug("create: '%s' created with index %u!\n", set->name, index); |
| 712 | ip_set_list[index] = set; |
| 713 | |
| 714 | return ret; |
| 715 | |
| 716 | cleanup: |
| 717 | set->variant->destroy(set); |
| 718 | put_out: |
| 719 | module_put(set->type->me); |
| 720 | out: |
| 721 | kfree(set); |
| 722 | return ret; |
| 723 | } |
| 724 | |
| 725 | /* Destroy sets */ |
| 726 | |
| 727 | static const struct nla_policy |
| 728 | ip_set_setname_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 729 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 730 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, |
| 731 | .len = IPSET_MAXNAMELEN - 1 }, |
| 732 | }; |
| 733 | |
| 734 | static void |
| 735 | ip_set_destroy_set(ip_set_id_t index) |
| 736 | { |
| 737 | struct ip_set *set = ip_set_list[index]; |
| 738 | |
| 739 | pr_debug("set: %s\n", set->name); |
| 740 | ip_set_list[index] = NULL; |
| 741 | |
| 742 | /* Must call it without holding any lock */ |
| 743 | set->variant->destroy(set); |
| 744 | module_put(set->type->me); |
| 745 | kfree(set); |
| 746 | } |
| 747 | |
| 748 | static int |
| 749 | ip_set_destroy(struct sock *ctnl, struct sk_buff *skb, |
| 750 | const struct nlmsghdr *nlh, |
| 751 | const struct nlattr * const attr[]) |
| 752 | { |
| 753 | ip_set_id_t i; |
| 754 | |
| 755 | if (unlikely(protocol_failed(attr))) |
| 756 | return -IPSET_ERR_PROTOCOL; |
| 757 | |
| 758 | /* References are protected by the nfnl mutex */ |
| 759 | if (!attr[IPSET_ATTR_SETNAME]) { |
| 760 | for (i = 0; i < ip_set_max; i++) { |
| 761 | if (ip_set_list[i] != NULL && |
| 762 | (atomic_read(&ip_set_list[i]->ref))) |
| 763 | return -IPSET_ERR_BUSY; |
| 764 | } |
| 765 | for (i = 0; i < ip_set_max; i++) { |
| 766 | if (ip_set_list[i] != NULL) |
| 767 | ip_set_destroy_set(i); |
| 768 | } |
| 769 | } else { |
| 770 | i = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME])); |
| 771 | if (i == IPSET_INVALID_ID) |
| 772 | return -ENOENT; |
| 773 | else if (atomic_read(&ip_set_list[i]->ref)) |
| 774 | return -IPSET_ERR_BUSY; |
| 775 | |
| 776 | ip_set_destroy_set(i); |
| 777 | } |
| 778 | return 0; |
| 779 | } |
| 780 | |
| 781 | /* Flush sets */ |
| 782 | |
| 783 | static void |
| 784 | ip_set_flush_set(struct ip_set *set) |
| 785 | { |
| 786 | pr_debug("set: %s\n", set->name); |
| 787 | |
| 788 | write_lock_bh(&set->lock); |
| 789 | set->variant->flush(set); |
| 790 | write_unlock_bh(&set->lock); |
| 791 | } |
| 792 | |
| 793 | static int |
| 794 | ip_set_flush(struct sock *ctnl, struct sk_buff *skb, |
| 795 | const struct nlmsghdr *nlh, |
| 796 | const struct nlattr * const attr[]) |
| 797 | { |
| 798 | ip_set_id_t i; |
| 799 | |
| 800 | if (unlikely(protocol_failed(attr))) |
| 801 | return -EPROTO; |
| 802 | |
| 803 | if (!attr[IPSET_ATTR_SETNAME]) { |
| 804 | for (i = 0; i < ip_set_max; i++) |
| 805 | if (ip_set_list[i] != NULL) |
| 806 | ip_set_flush_set(ip_set_list[i]); |
| 807 | } else { |
| 808 | i = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME])); |
| 809 | if (i == IPSET_INVALID_ID) |
| 810 | return -ENOENT; |
| 811 | |
| 812 | ip_set_flush_set(ip_set_list[i]); |
| 813 | } |
| 814 | |
| 815 | return 0; |
| 816 | } |
| 817 | |
| 818 | /* Rename a set */ |
| 819 | |
| 820 | static const struct nla_policy |
| 821 | ip_set_setname2_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 822 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 823 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, |
| 824 | .len = IPSET_MAXNAMELEN - 1 }, |
| 825 | [IPSET_ATTR_SETNAME2] = { .type = NLA_NUL_STRING, |
| 826 | .len = IPSET_MAXNAMELEN - 1 }, |
| 827 | }; |
| 828 | |
| 829 | static int |
| 830 | ip_set_rename(struct sock *ctnl, struct sk_buff *skb, |
| 831 | const struct nlmsghdr *nlh, |
| 832 | const struct nlattr * const attr[]) |
| 833 | { |
| 834 | struct ip_set *set; |
| 835 | const char *name2; |
| 836 | ip_set_id_t i; |
| 837 | |
| 838 | if (unlikely(protocol_failed(attr) || |
| 839 | attr[IPSET_ATTR_SETNAME] == NULL || |
| 840 | attr[IPSET_ATTR_SETNAME2] == NULL)) |
| 841 | return -IPSET_ERR_PROTOCOL; |
| 842 | |
| 843 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); |
| 844 | if (set == NULL) |
| 845 | return -ENOENT; |
| 846 | if (atomic_read(&set->ref) != 0) |
| 847 | return -IPSET_ERR_REFERENCED; |
| 848 | |
| 849 | name2 = nla_data(attr[IPSET_ATTR_SETNAME2]); |
| 850 | for (i = 0; i < ip_set_max; i++) { |
| 851 | if (ip_set_list[i] != NULL && |
| 852 | STREQ(ip_set_list[i]->name, name2)) |
| 853 | return -IPSET_ERR_EXIST_SETNAME2; |
| 854 | } |
| 855 | strncpy(set->name, name2, IPSET_MAXNAMELEN); |
| 856 | |
| 857 | return 0; |
| 858 | } |
| 859 | |
| 860 | /* Swap two sets so that name/index points to the other. |
| 861 | * References and set names are also swapped. |
| 862 | * |
| 863 | * We are protected by the nfnl mutex and references are |
| 864 | * manipulated only by holding the mutex. The kernel interfaces |
| 865 | * do not hold the mutex but the pointer settings are atomic |
| 866 | * so the ip_set_list always contains valid pointers to the sets. |
| 867 | */ |
| 868 | |
| 869 | static int |
| 870 | ip_set_swap(struct sock *ctnl, struct sk_buff *skb, |
| 871 | const struct nlmsghdr *nlh, |
| 872 | const struct nlattr * const attr[]) |
| 873 | { |
| 874 | struct ip_set *from, *to; |
| 875 | ip_set_id_t from_id, to_id; |
| 876 | char from_name[IPSET_MAXNAMELEN]; |
| 877 | u32 from_ref; |
| 878 | |
| 879 | if (unlikely(protocol_failed(attr) || |
| 880 | attr[IPSET_ATTR_SETNAME] == NULL || |
| 881 | attr[IPSET_ATTR_SETNAME2] == NULL)) |
| 882 | return -IPSET_ERR_PROTOCOL; |
| 883 | |
| 884 | from_id = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME])); |
| 885 | if (from_id == IPSET_INVALID_ID) |
| 886 | return -ENOENT; |
| 887 | |
| 888 | to_id = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME2])); |
| 889 | if (to_id == IPSET_INVALID_ID) |
| 890 | return -IPSET_ERR_EXIST_SETNAME2; |
| 891 | |
| 892 | from = ip_set_list[from_id]; |
| 893 | to = ip_set_list[to_id]; |
| 894 | |
| 895 | /* Features must not change. |
| 896 | * Not an artifical restriction anymore, as we must prevent |
| 897 | * possible loops created by swapping in setlist type of sets. */ |
| 898 | if (!(from->type->features == to->type->features && |
| 899 | from->type->family == to->type->family)) |
| 900 | return -IPSET_ERR_TYPE_MISMATCH; |
| 901 | |
| 902 | /* No magic here: ref munging protected by the nfnl_lock */ |
| 903 | strncpy(from_name, from->name, IPSET_MAXNAMELEN); |
| 904 | from_ref = atomic_read(&from->ref); |
| 905 | |
| 906 | strncpy(from->name, to->name, IPSET_MAXNAMELEN); |
| 907 | atomic_set(&from->ref, atomic_read(&to->ref)); |
| 908 | strncpy(to->name, from_name, IPSET_MAXNAMELEN); |
| 909 | atomic_set(&to->ref, from_ref); |
| 910 | |
| 911 | ip_set_list[from_id] = to; |
| 912 | ip_set_list[to_id] = from; |
| 913 | |
| 914 | return 0; |
| 915 | } |
| 916 | |
| 917 | /* List/save set data */ |
| 918 | |
| 919 | #define DUMP_INIT 0L |
| 920 | #define DUMP_ALL 1L |
| 921 | #define DUMP_ONE 2L |
| 922 | #define DUMP_LAST 3L |
| 923 | |
| 924 | static int |
| 925 | ip_set_dump_done(struct netlink_callback *cb) |
| 926 | { |
| 927 | if (cb->args[2]) { |
| 928 | pr_debug("release set %s\n", ip_set_list[cb->args[1]]->name); |
| 929 | __ip_set_put((ip_set_id_t) cb->args[1]); |
| 930 | } |
| 931 | return 0; |
| 932 | } |
| 933 | |
| 934 | static inline void |
| 935 | dump_attrs(struct nlmsghdr *nlh) |
| 936 | { |
| 937 | const struct nlattr *attr; |
| 938 | int rem; |
| 939 | |
| 940 | pr_debug("dump nlmsg\n"); |
| 941 | nlmsg_for_each_attr(attr, nlh, sizeof(struct nfgenmsg), rem) { |
| 942 | pr_debug("type: %u, len %u\n", nla_type(attr), attr->nla_len); |
| 943 | } |
| 944 | } |
| 945 | |
| 946 | static int |
| 947 | dump_init(struct netlink_callback *cb) |
| 948 | { |
| 949 | struct nlmsghdr *nlh = nlmsg_hdr(cb->skb); |
| 950 | int min_len = NLMSG_SPACE(sizeof(struct nfgenmsg)); |
| 951 | struct nlattr *cda[IPSET_ATTR_CMD_MAX+1]; |
| 952 | struct nlattr *attr = (void *)nlh + min_len; |
| 953 | ip_set_id_t index; |
| 954 | |
| 955 | /* Second pass, so parser can't fail */ |
| 956 | nla_parse(cda, IPSET_ATTR_CMD_MAX, |
| 957 | attr, nlh->nlmsg_len - min_len, ip_set_setname_policy); |
| 958 | |
| 959 | /* cb->args[0] : dump single set/all sets |
| 960 | * [1] : set index |
| 961 | * [..]: type specific |
| 962 | */ |
| 963 | |
| 964 | if (!cda[IPSET_ATTR_SETNAME]) { |
| 965 | cb->args[0] = DUMP_ALL; |
| 966 | return 0; |
| 967 | } |
| 968 | |
| 969 | index = find_set_id(nla_data(cda[IPSET_ATTR_SETNAME])); |
| 970 | if (index == IPSET_INVALID_ID) |
| 971 | return -ENOENT; |
| 972 | |
| 973 | cb->args[0] = DUMP_ONE; |
| 974 | cb->args[1] = index; |
| 975 | return 0; |
| 976 | } |
| 977 | |
| 978 | static int |
| 979 | ip_set_dump_start(struct sk_buff *skb, struct netlink_callback *cb) |
| 980 | { |
| 981 | ip_set_id_t index = IPSET_INVALID_ID, max; |
| 982 | struct ip_set *set = NULL; |
| 983 | struct nlmsghdr *nlh = NULL; |
| 984 | unsigned int flags = NETLINK_CB(cb->skb).pid ? NLM_F_MULTI : 0; |
| 985 | int ret = 0; |
| 986 | |
| 987 | if (cb->args[0] == DUMP_INIT) { |
| 988 | ret = dump_init(cb); |
| 989 | if (ret < 0) { |
| 990 | nlh = nlmsg_hdr(cb->skb); |
| 991 | /* We have to create and send the error message |
| 992 | * manually :-( */ |
| 993 | if (nlh->nlmsg_flags & NLM_F_ACK) |
| 994 | netlink_ack(cb->skb, nlh, ret); |
| 995 | return ret; |
| 996 | } |
| 997 | } |
| 998 | |
| 999 | if (cb->args[1] >= ip_set_max) |
| 1000 | goto out; |
| 1001 | |
| 1002 | pr_debug("args[0]: %ld args[1]: %ld\n", cb->args[0], cb->args[1]); |
| 1003 | max = cb->args[0] == DUMP_ONE ? cb->args[1] + 1 : ip_set_max; |
| 1004 | for (; cb->args[1] < max; cb->args[1]++) { |
| 1005 | index = (ip_set_id_t) cb->args[1]; |
| 1006 | set = ip_set_list[index]; |
| 1007 | if (set == NULL) { |
| 1008 | if (cb->args[0] == DUMP_ONE) { |
| 1009 | ret = -ENOENT; |
| 1010 | goto out; |
| 1011 | } |
| 1012 | continue; |
| 1013 | } |
| 1014 | /* When dumping all sets, we must dump "sorted" |
| 1015 | * so that lists (unions of sets) are dumped last. |
| 1016 | */ |
| 1017 | if (cb->args[0] != DUMP_ONE && |
| 1018 | !((cb->args[0] == DUMP_ALL) ^ |
| 1019 | (set->type->features & IPSET_DUMP_LAST))) |
| 1020 | continue; |
| 1021 | pr_debug("List set: %s\n", set->name); |
| 1022 | if (!cb->args[2]) { |
| 1023 | /* Start listing: make sure set won't be destroyed */ |
| 1024 | pr_debug("reference set\n"); |
| 1025 | __ip_set_get(index); |
| 1026 | } |
| 1027 | nlh = start_msg(skb, NETLINK_CB(cb->skb).pid, |
| 1028 | cb->nlh->nlmsg_seq, flags, |
| 1029 | IPSET_CMD_LIST); |
| 1030 | if (!nlh) { |
| 1031 | ret = -EMSGSIZE; |
| 1032 | goto release_refcount; |
| 1033 | } |
| 1034 | NLA_PUT_U8(skb, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL); |
| 1035 | NLA_PUT_STRING(skb, IPSET_ATTR_SETNAME, set->name); |
| 1036 | switch (cb->args[2]) { |
| 1037 | case 0: |
| 1038 | /* Core header data */ |
| 1039 | NLA_PUT_STRING(skb, IPSET_ATTR_TYPENAME, |
| 1040 | set->type->name); |
| 1041 | NLA_PUT_U8(skb, IPSET_ATTR_FAMILY, |
| 1042 | set->family); |
| 1043 | NLA_PUT_U8(skb, IPSET_ATTR_REVISION, |
| 1044 | set->type->revision); |
| 1045 | ret = set->variant->head(set, skb); |
| 1046 | if (ret < 0) |
| 1047 | goto release_refcount; |
| 1048 | /* Fall through and add elements */ |
| 1049 | default: |
| 1050 | read_lock_bh(&set->lock); |
| 1051 | ret = set->variant->list(set, skb, cb); |
| 1052 | read_unlock_bh(&set->lock); |
| 1053 | if (!cb->args[2]) { |
| 1054 | /* Set is done, proceed with next one */ |
| 1055 | if (cb->args[0] == DUMP_ONE) |
| 1056 | cb->args[1] = IPSET_INVALID_ID; |
| 1057 | else |
| 1058 | cb->args[1]++; |
| 1059 | } |
| 1060 | goto release_refcount; |
| 1061 | } |
| 1062 | } |
| 1063 | goto out; |
| 1064 | |
| 1065 | nla_put_failure: |
| 1066 | ret = -EFAULT; |
| 1067 | release_refcount: |
| 1068 | /* If there was an error or set is done, release set */ |
| 1069 | if (ret || !cb->args[2]) { |
| 1070 | pr_debug("release set %s\n", ip_set_list[index]->name); |
| 1071 | __ip_set_put(index); |
| 1072 | } |
| 1073 | |
| 1074 | /* If we dump all sets, continue with dumping last ones */ |
| 1075 | if (cb->args[0] == DUMP_ALL && cb->args[1] >= max && !cb->args[2]) |
| 1076 | cb->args[0] = DUMP_LAST; |
| 1077 | |
| 1078 | out: |
| 1079 | if (nlh) { |
| 1080 | nlmsg_end(skb, nlh); |
| 1081 | pr_debug("nlmsg_len: %u\n", nlh->nlmsg_len); |
| 1082 | dump_attrs(nlh); |
| 1083 | } |
| 1084 | |
| 1085 | return ret < 0 ? ret : skb->len; |
| 1086 | } |
| 1087 | |
| 1088 | static int |
| 1089 | ip_set_dump(struct sock *ctnl, struct sk_buff *skb, |
| 1090 | const struct nlmsghdr *nlh, |
| 1091 | const struct nlattr * const attr[]) |
| 1092 | { |
| 1093 | if (unlikely(protocol_failed(attr))) |
| 1094 | return -IPSET_ERR_PROTOCOL; |
| 1095 | |
| 1096 | return netlink_dump_start(ctnl, skb, nlh, |
| 1097 | ip_set_dump_start, |
| 1098 | ip_set_dump_done); |
| 1099 | } |
| 1100 | |
| 1101 | /* Add, del and test */ |
| 1102 | |
| 1103 | static const struct nla_policy ip_set_adt_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 1104 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 1105 | [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, |
| 1106 | .len = IPSET_MAXNAMELEN - 1 }, |
| 1107 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, |
| 1108 | [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, |
| 1109 | [IPSET_ATTR_ADT] = { .type = NLA_NESTED }, |
| 1110 | }; |
| 1111 | |
| 1112 | static int |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1113 | call_ad(struct sock *ctnl, struct sk_buff *skb, struct ip_set *set, |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1114 | struct nlattr *tb[], enum ipset_adt adt, |
| 1115 | u32 flags, bool use_lineno) |
| 1116 | { |
| 1117 | int ret, retried = 0; |
| 1118 | u32 lineno = 0; |
| 1119 | bool eexist = flags & IPSET_FLAG_EXIST; |
| 1120 | |
| 1121 | do { |
| 1122 | write_lock_bh(&set->lock); |
| 1123 | ret = set->variant->uadt(set, tb, adt, &lineno, flags); |
| 1124 | write_unlock_bh(&set->lock); |
| 1125 | } while (ret == -EAGAIN && |
| 1126 | set->variant->resize && |
| 1127 | (ret = set->variant->resize(set, retried++)) == 0); |
| 1128 | |
| 1129 | if (!ret || (ret == -IPSET_ERR_EXIST && eexist)) |
| 1130 | return 0; |
| 1131 | if (lineno && use_lineno) { |
| 1132 | /* Error in restore/batch mode: send back lineno */ |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1133 | struct nlmsghdr *rep, *nlh = nlmsg_hdr(skb); |
| 1134 | struct sk_buff *skb2; |
| 1135 | struct nlmsgerr *errmsg; |
| 1136 | size_t payload = sizeof(*errmsg) + nlmsg_len(nlh); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1137 | int min_len = NLMSG_SPACE(sizeof(struct nfgenmsg)); |
| 1138 | struct nlattr *cda[IPSET_ATTR_CMD_MAX+1]; |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1139 | struct nlattr *cmdattr; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1140 | u32 *errline; |
| 1141 | |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1142 | skb2 = nlmsg_new(payload, GFP_KERNEL); |
| 1143 | if (skb2 == NULL) |
| 1144 | return -ENOMEM; |
| 1145 | rep = __nlmsg_put(skb2, NETLINK_CB(skb).pid, |
| 1146 | nlh->nlmsg_seq, NLMSG_ERROR, payload, 0); |
| 1147 | errmsg = nlmsg_data(rep); |
| 1148 | errmsg->error = ret; |
| 1149 | memcpy(&errmsg->msg, nlh, nlh->nlmsg_len); |
| 1150 | cmdattr = (void *)&errmsg->msg + min_len; |
| 1151 | |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1152 | nla_parse(cda, IPSET_ATTR_CMD_MAX, |
| 1153 | cmdattr, nlh->nlmsg_len - min_len, |
| 1154 | ip_set_adt_policy); |
| 1155 | |
| 1156 | errline = nla_data(cda[IPSET_ATTR_LINENO]); |
| 1157 | |
| 1158 | *errline = lineno; |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1159 | |
| 1160 | netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); |
| 1161 | /* Signal netlink not to send its ACK/errmsg. */ |
| 1162 | return -EINTR; |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1163 | } |
| 1164 | |
| 1165 | return ret; |
| 1166 | } |
| 1167 | |
| 1168 | static int |
| 1169 | ip_set_uadd(struct sock *ctnl, struct sk_buff *skb, |
| 1170 | const struct nlmsghdr *nlh, |
| 1171 | const struct nlattr * const attr[]) |
| 1172 | { |
| 1173 | struct ip_set *set; |
| 1174 | struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {}; |
| 1175 | const struct nlattr *nla; |
| 1176 | u32 flags = flag_exist(nlh); |
| 1177 | bool use_lineno; |
| 1178 | int ret = 0; |
| 1179 | |
| 1180 | if (unlikely(protocol_failed(attr) || |
| 1181 | attr[IPSET_ATTR_SETNAME] == NULL || |
| 1182 | !((attr[IPSET_ATTR_DATA] != NULL) ^ |
| 1183 | (attr[IPSET_ATTR_ADT] != NULL)) || |
| 1184 | (attr[IPSET_ATTR_DATA] != NULL && |
| 1185 | !flag_nested(attr[IPSET_ATTR_DATA])) || |
| 1186 | (attr[IPSET_ATTR_ADT] != NULL && |
| 1187 | (!flag_nested(attr[IPSET_ATTR_ADT]) || |
| 1188 | attr[IPSET_ATTR_LINENO] == NULL)))) |
| 1189 | return -IPSET_ERR_PROTOCOL; |
| 1190 | |
| 1191 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); |
| 1192 | if (set == NULL) |
| 1193 | return -ENOENT; |
| 1194 | |
| 1195 | use_lineno = !!attr[IPSET_ATTR_LINENO]; |
| 1196 | if (attr[IPSET_ATTR_DATA]) { |
Patrick McHardy | 8da560c | 2011-02-01 16:27:25 +0100 | [diff] [blame] | 1197 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, |
| 1198 | attr[IPSET_ATTR_DATA], |
| 1199 | set->type->adt_policy)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1200 | return -IPSET_ERR_PROTOCOL; |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1201 | ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, flags, |
| 1202 | use_lineno); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1203 | } else { |
| 1204 | int nla_rem; |
| 1205 | |
| 1206 | nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { |
| 1207 | memset(tb, 0, sizeof(tb)); |
| 1208 | if (nla_type(nla) != IPSET_ATTR_DATA || |
| 1209 | !flag_nested(nla) || |
Patrick McHardy | 8da560c | 2011-02-01 16:27:25 +0100 | [diff] [blame] | 1210 | nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, |
| 1211 | set->type->adt_policy)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1212 | return -IPSET_ERR_PROTOCOL; |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1213 | ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1214 | flags, use_lineno); |
| 1215 | if (ret < 0) |
| 1216 | return ret; |
| 1217 | } |
| 1218 | } |
| 1219 | return ret; |
| 1220 | } |
| 1221 | |
| 1222 | static int |
| 1223 | ip_set_udel(struct sock *ctnl, struct sk_buff *skb, |
| 1224 | const struct nlmsghdr *nlh, |
| 1225 | const struct nlattr * const attr[]) |
| 1226 | { |
| 1227 | struct ip_set *set; |
| 1228 | struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {}; |
| 1229 | const struct nlattr *nla; |
| 1230 | u32 flags = flag_exist(nlh); |
| 1231 | bool use_lineno; |
| 1232 | int ret = 0; |
| 1233 | |
| 1234 | if (unlikely(protocol_failed(attr) || |
| 1235 | attr[IPSET_ATTR_SETNAME] == NULL || |
| 1236 | !((attr[IPSET_ATTR_DATA] != NULL) ^ |
| 1237 | (attr[IPSET_ATTR_ADT] != NULL)) || |
| 1238 | (attr[IPSET_ATTR_DATA] != NULL && |
| 1239 | !flag_nested(attr[IPSET_ATTR_DATA])) || |
| 1240 | (attr[IPSET_ATTR_ADT] != NULL && |
| 1241 | (!flag_nested(attr[IPSET_ATTR_ADT]) || |
| 1242 | attr[IPSET_ATTR_LINENO] == NULL)))) |
| 1243 | return -IPSET_ERR_PROTOCOL; |
| 1244 | |
| 1245 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); |
| 1246 | if (set == NULL) |
| 1247 | return -ENOENT; |
| 1248 | |
| 1249 | use_lineno = !!attr[IPSET_ATTR_LINENO]; |
| 1250 | if (attr[IPSET_ATTR_DATA]) { |
Patrick McHardy | 8da560c | 2011-02-01 16:27:25 +0100 | [diff] [blame] | 1251 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, |
| 1252 | attr[IPSET_ATTR_DATA], |
| 1253 | set->type->adt_policy)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1254 | return -IPSET_ERR_PROTOCOL; |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1255 | ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, flags, |
| 1256 | use_lineno); |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1257 | } else { |
| 1258 | int nla_rem; |
| 1259 | |
| 1260 | nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { |
| 1261 | memset(tb, 0, sizeof(*tb)); |
| 1262 | if (nla_type(nla) != IPSET_ATTR_DATA || |
| 1263 | !flag_nested(nla) || |
Patrick McHardy | 8da560c | 2011-02-01 16:27:25 +0100 | [diff] [blame] | 1264 | nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, |
| 1265 | set->type->adt_policy)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1266 | return -IPSET_ERR_PROTOCOL; |
Jozsef Kadlecsik | 5f52bc3 | 2011-02-02 23:56:00 +0100 | [diff] [blame] | 1267 | ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1268 | flags, use_lineno); |
| 1269 | if (ret < 0) |
| 1270 | return ret; |
| 1271 | } |
| 1272 | } |
| 1273 | return ret; |
| 1274 | } |
| 1275 | |
| 1276 | static int |
| 1277 | ip_set_utest(struct sock *ctnl, struct sk_buff *skb, |
| 1278 | const struct nlmsghdr *nlh, |
| 1279 | const struct nlattr * const attr[]) |
| 1280 | { |
| 1281 | struct ip_set *set; |
| 1282 | struct nlattr *tb[IPSET_ATTR_ADT_MAX+1] = {}; |
| 1283 | int ret = 0; |
| 1284 | |
| 1285 | if (unlikely(protocol_failed(attr) || |
| 1286 | attr[IPSET_ATTR_SETNAME] == NULL || |
| 1287 | attr[IPSET_ATTR_DATA] == NULL || |
| 1288 | !flag_nested(attr[IPSET_ATTR_DATA]))) |
| 1289 | return -IPSET_ERR_PROTOCOL; |
| 1290 | |
| 1291 | set = find_set(nla_data(attr[IPSET_ATTR_SETNAME])); |
| 1292 | if (set == NULL) |
| 1293 | return -ENOENT; |
| 1294 | |
Patrick McHardy | 8da560c | 2011-02-01 16:27:25 +0100 | [diff] [blame] | 1295 | if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA], |
| 1296 | set->type->adt_policy)) |
Jozsef Kadlecsik | a7b4f98 | 2011-02-01 15:28:35 +0100 | [diff] [blame] | 1297 | return -IPSET_ERR_PROTOCOL; |
| 1298 | |
| 1299 | read_lock_bh(&set->lock); |
| 1300 | ret = set->variant->uadt(set, tb, IPSET_TEST, NULL, 0); |
| 1301 | read_unlock_bh(&set->lock); |
| 1302 | /* Userspace can't trigger element to be re-added */ |
| 1303 | if (ret == -EAGAIN) |
| 1304 | ret = 1; |
| 1305 | |
| 1306 | return ret < 0 ? ret : ret > 0 ? 0 : -IPSET_ERR_EXIST; |
| 1307 | } |
| 1308 | |
| 1309 | /* Get headed data of a set */ |
| 1310 | |
| 1311 | static int |
| 1312 | ip_set_header(struct sock *ctnl, struct sk_buff *skb, |
| 1313 | const struct nlmsghdr *nlh, |
| 1314 | const struct nlattr * const attr[]) |
| 1315 | { |
| 1316 | const struct ip_set *set; |
| 1317 | struct sk_buff *skb2; |
| 1318 | struct nlmsghdr *nlh2; |
| 1319 | ip_set_id_t index; |
| 1320 | int ret = 0; |
| 1321 | |
| 1322 | if (unlikely(protocol_failed(attr) || |
| 1323 | attr[IPSET_ATTR_SETNAME] == NULL)) |
| 1324 | return -IPSET_ERR_PROTOCOL; |
| 1325 | |
| 1326 | index = find_set_id(nla_data(attr[IPSET_ATTR_SETNAME])); |
| 1327 | if (index == IPSET_INVALID_ID) |
| 1328 | return -ENOENT; |
| 1329 | set = ip_set_list[index]; |
| 1330 | |
| 1331 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 1332 | if (skb2 == NULL) |
| 1333 | return -ENOMEM; |
| 1334 | |
| 1335 | nlh2 = start_msg(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, |
| 1336 | IPSET_CMD_HEADER); |
| 1337 | if (!nlh2) |
| 1338 | goto nlmsg_failure; |
| 1339 | NLA_PUT_U8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL); |
| 1340 | NLA_PUT_STRING(skb2, IPSET_ATTR_SETNAME, set->name); |
| 1341 | NLA_PUT_STRING(skb2, IPSET_ATTR_TYPENAME, set->type->name); |
| 1342 | NLA_PUT_U8(skb2, IPSET_ATTR_FAMILY, set->family); |
| 1343 | NLA_PUT_U8(skb2, IPSET_ATTR_REVISION, set->type->revision); |
| 1344 | nlmsg_end(skb2, nlh2); |
| 1345 | |
| 1346 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); |
| 1347 | if (ret < 0) |
| 1348 | return ret; |
| 1349 | |
| 1350 | return 0; |
| 1351 | |
| 1352 | nla_put_failure: |
| 1353 | nlmsg_cancel(skb2, nlh2); |
| 1354 | nlmsg_failure: |
| 1355 | kfree_skb(skb2); |
| 1356 | return -EMSGSIZE; |
| 1357 | } |
| 1358 | |
| 1359 | /* Get type data */ |
| 1360 | |
| 1361 | static const struct nla_policy ip_set_type_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 1362 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 1363 | [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, |
| 1364 | .len = IPSET_MAXNAMELEN - 1 }, |
| 1365 | [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, |
| 1366 | }; |
| 1367 | |
| 1368 | static int |
| 1369 | ip_set_type(struct sock *ctnl, struct sk_buff *skb, |
| 1370 | const struct nlmsghdr *nlh, |
| 1371 | const struct nlattr * const attr[]) |
| 1372 | { |
| 1373 | struct sk_buff *skb2; |
| 1374 | struct nlmsghdr *nlh2; |
| 1375 | u8 family, min, max; |
| 1376 | const char *typename; |
| 1377 | int ret = 0; |
| 1378 | |
| 1379 | if (unlikely(protocol_failed(attr) || |
| 1380 | attr[IPSET_ATTR_TYPENAME] == NULL || |
| 1381 | attr[IPSET_ATTR_FAMILY] == NULL)) |
| 1382 | return -IPSET_ERR_PROTOCOL; |
| 1383 | |
| 1384 | family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); |
| 1385 | typename = nla_data(attr[IPSET_ATTR_TYPENAME]); |
| 1386 | ret = find_set_type_minmax(typename, family, &min, &max); |
| 1387 | if (ret) |
| 1388 | return ret; |
| 1389 | |
| 1390 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 1391 | if (skb2 == NULL) |
| 1392 | return -ENOMEM; |
| 1393 | |
| 1394 | nlh2 = start_msg(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, |
| 1395 | IPSET_CMD_TYPE); |
| 1396 | if (!nlh2) |
| 1397 | goto nlmsg_failure; |
| 1398 | NLA_PUT_U8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL); |
| 1399 | NLA_PUT_STRING(skb2, IPSET_ATTR_TYPENAME, typename); |
| 1400 | NLA_PUT_U8(skb2, IPSET_ATTR_FAMILY, family); |
| 1401 | NLA_PUT_U8(skb2, IPSET_ATTR_REVISION, max); |
| 1402 | NLA_PUT_U8(skb2, IPSET_ATTR_REVISION_MIN, min); |
| 1403 | nlmsg_end(skb2, nlh2); |
| 1404 | |
| 1405 | pr_debug("Send TYPE, nlmsg_len: %u\n", nlh2->nlmsg_len); |
| 1406 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); |
| 1407 | if (ret < 0) |
| 1408 | return ret; |
| 1409 | |
| 1410 | return 0; |
| 1411 | |
| 1412 | nla_put_failure: |
| 1413 | nlmsg_cancel(skb2, nlh2); |
| 1414 | nlmsg_failure: |
| 1415 | kfree_skb(skb2); |
| 1416 | return -EMSGSIZE; |
| 1417 | } |
| 1418 | |
| 1419 | /* Get protocol version */ |
| 1420 | |
| 1421 | static const struct nla_policy |
| 1422 | ip_set_protocol_policy[IPSET_ATTR_CMD_MAX + 1] = { |
| 1423 | [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, |
| 1424 | }; |
| 1425 | |
| 1426 | static int |
| 1427 | ip_set_protocol(struct sock *ctnl, struct sk_buff *skb, |
| 1428 | const struct nlmsghdr *nlh, |
| 1429 | const struct nlattr * const attr[]) |
| 1430 | { |
| 1431 | struct sk_buff *skb2; |
| 1432 | struct nlmsghdr *nlh2; |
| 1433 | int ret = 0; |
| 1434 | |
| 1435 | if (unlikely(attr[IPSET_ATTR_PROTOCOL] == NULL)) |
| 1436 | return -IPSET_ERR_PROTOCOL; |
| 1437 | |
| 1438 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 1439 | if (skb2 == NULL) |
| 1440 | return -ENOMEM; |
| 1441 | |
| 1442 | nlh2 = start_msg(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, |
| 1443 | IPSET_CMD_PROTOCOL); |
| 1444 | if (!nlh2) |
| 1445 | goto nlmsg_failure; |
| 1446 | NLA_PUT_U8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL); |
| 1447 | nlmsg_end(skb2, nlh2); |
| 1448 | |
| 1449 | ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); |
| 1450 | if (ret < 0) |
| 1451 | return ret; |
| 1452 | |
| 1453 | return 0; |
| 1454 | |
| 1455 | nla_put_failure: |
| 1456 | nlmsg_cancel(skb2, nlh2); |
| 1457 | nlmsg_failure: |
| 1458 | kfree_skb(skb2); |
| 1459 | return -EMSGSIZE; |
| 1460 | } |
| 1461 | |
| 1462 | static const struct nfnl_callback ip_set_netlink_subsys_cb[IPSET_MSG_MAX] = { |
| 1463 | [IPSET_CMD_CREATE] = { |
| 1464 | .call = ip_set_create, |
| 1465 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1466 | .policy = ip_set_create_policy, |
| 1467 | }, |
| 1468 | [IPSET_CMD_DESTROY] = { |
| 1469 | .call = ip_set_destroy, |
| 1470 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1471 | .policy = ip_set_setname_policy, |
| 1472 | }, |
| 1473 | [IPSET_CMD_FLUSH] = { |
| 1474 | .call = ip_set_flush, |
| 1475 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1476 | .policy = ip_set_setname_policy, |
| 1477 | }, |
| 1478 | [IPSET_CMD_RENAME] = { |
| 1479 | .call = ip_set_rename, |
| 1480 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1481 | .policy = ip_set_setname2_policy, |
| 1482 | }, |
| 1483 | [IPSET_CMD_SWAP] = { |
| 1484 | .call = ip_set_swap, |
| 1485 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1486 | .policy = ip_set_setname2_policy, |
| 1487 | }, |
| 1488 | [IPSET_CMD_LIST] = { |
| 1489 | .call = ip_set_dump, |
| 1490 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1491 | .policy = ip_set_setname_policy, |
| 1492 | }, |
| 1493 | [IPSET_CMD_SAVE] = { |
| 1494 | .call = ip_set_dump, |
| 1495 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1496 | .policy = ip_set_setname_policy, |
| 1497 | }, |
| 1498 | [IPSET_CMD_ADD] = { |
| 1499 | .call = ip_set_uadd, |
| 1500 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1501 | .policy = ip_set_adt_policy, |
| 1502 | }, |
| 1503 | [IPSET_CMD_DEL] = { |
| 1504 | .call = ip_set_udel, |
| 1505 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1506 | .policy = ip_set_adt_policy, |
| 1507 | }, |
| 1508 | [IPSET_CMD_TEST] = { |
| 1509 | .call = ip_set_utest, |
| 1510 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1511 | .policy = ip_set_adt_policy, |
| 1512 | }, |
| 1513 | [IPSET_CMD_HEADER] = { |
| 1514 | .call = ip_set_header, |
| 1515 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1516 | .policy = ip_set_setname_policy, |
| 1517 | }, |
| 1518 | [IPSET_CMD_TYPE] = { |
| 1519 | .call = ip_set_type, |
| 1520 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1521 | .policy = ip_set_type_policy, |
| 1522 | }, |
| 1523 | [IPSET_CMD_PROTOCOL] = { |
| 1524 | .call = ip_set_protocol, |
| 1525 | .attr_count = IPSET_ATTR_CMD_MAX, |
| 1526 | .policy = ip_set_protocol_policy, |
| 1527 | }, |
| 1528 | }; |
| 1529 | |
| 1530 | static struct nfnetlink_subsystem ip_set_netlink_subsys __read_mostly = { |
| 1531 | .name = "ip_set", |
| 1532 | .subsys_id = NFNL_SUBSYS_IPSET, |
| 1533 | .cb_count = IPSET_MSG_MAX, |
| 1534 | .cb = ip_set_netlink_subsys_cb, |
| 1535 | }; |
| 1536 | |
| 1537 | /* Interface to iptables/ip6tables */ |
| 1538 | |
| 1539 | static int |
| 1540 | ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len) |
| 1541 | { |
| 1542 | unsigned *op; |
| 1543 | void *data; |
| 1544 | int copylen = *len, ret = 0; |
| 1545 | |
| 1546 | if (!capable(CAP_NET_ADMIN)) |
| 1547 | return -EPERM; |
| 1548 | if (optval != SO_IP_SET) |
| 1549 | return -EBADF; |
| 1550 | if (*len < sizeof(unsigned)) |
| 1551 | return -EINVAL; |
| 1552 | |
| 1553 | data = vmalloc(*len); |
| 1554 | if (!data) |
| 1555 | return -ENOMEM; |
| 1556 | if (copy_from_user(data, user, *len) != 0) { |
| 1557 | ret = -EFAULT; |
| 1558 | goto done; |
| 1559 | } |
| 1560 | op = (unsigned *) data; |
| 1561 | |
| 1562 | if (*op < IP_SET_OP_VERSION) { |
| 1563 | /* Check the version at the beginning of operations */ |
| 1564 | struct ip_set_req_version *req_version = data; |
| 1565 | if (req_version->version != IPSET_PROTOCOL) { |
| 1566 | ret = -EPROTO; |
| 1567 | goto done; |
| 1568 | } |
| 1569 | } |
| 1570 | |
| 1571 | switch (*op) { |
| 1572 | case IP_SET_OP_VERSION: { |
| 1573 | struct ip_set_req_version *req_version = data; |
| 1574 | |
| 1575 | if (*len != sizeof(struct ip_set_req_version)) { |
| 1576 | ret = -EINVAL; |
| 1577 | goto done; |
| 1578 | } |
| 1579 | |
| 1580 | req_version->version = IPSET_PROTOCOL; |
| 1581 | ret = copy_to_user(user, req_version, |
| 1582 | sizeof(struct ip_set_req_version)); |
| 1583 | goto done; |
| 1584 | } |
| 1585 | case IP_SET_OP_GET_BYNAME: { |
| 1586 | struct ip_set_req_get_set *req_get = data; |
| 1587 | |
| 1588 | if (*len != sizeof(struct ip_set_req_get_set)) { |
| 1589 | ret = -EINVAL; |
| 1590 | goto done; |
| 1591 | } |
| 1592 | req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; |
| 1593 | nfnl_lock(); |
| 1594 | req_get->set.index = find_set_id(req_get->set.name); |
| 1595 | nfnl_unlock(); |
| 1596 | goto copy; |
| 1597 | } |
| 1598 | case IP_SET_OP_GET_BYINDEX: { |
| 1599 | struct ip_set_req_get_set *req_get = data; |
| 1600 | |
| 1601 | if (*len != sizeof(struct ip_set_req_get_set) || |
| 1602 | req_get->set.index >= ip_set_max) { |
| 1603 | ret = -EINVAL; |
| 1604 | goto done; |
| 1605 | } |
| 1606 | nfnl_lock(); |
| 1607 | strncpy(req_get->set.name, |
| 1608 | ip_set_list[req_get->set.index] |
| 1609 | ? ip_set_list[req_get->set.index]->name : "", |
| 1610 | IPSET_MAXNAMELEN); |
| 1611 | nfnl_unlock(); |
| 1612 | goto copy; |
| 1613 | } |
| 1614 | default: |
| 1615 | ret = -EBADMSG; |
| 1616 | goto done; |
| 1617 | } /* end of switch(op) */ |
| 1618 | |
| 1619 | copy: |
| 1620 | ret = copy_to_user(user, data, copylen); |
| 1621 | |
| 1622 | done: |
| 1623 | vfree(data); |
| 1624 | if (ret > 0) |
| 1625 | ret = 0; |
| 1626 | return ret; |
| 1627 | } |
| 1628 | |
| 1629 | static struct nf_sockopt_ops so_set __read_mostly = { |
| 1630 | .pf = PF_INET, |
| 1631 | .get_optmin = SO_IP_SET, |
| 1632 | .get_optmax = SO_IP_SET + 1, |
| 1633 | .get = &ip_set_sockfn_get, |
| 1634 | .owner = THIS_MODULE, |
| 1635 | }; |
| 1636 | |
| 1637 | static int __init |
| 1638 | ip_set_init(void) |
| 1639 | { |
| 1640 | int ret; |
| 1641 | |
| 1642 | if (max_sets) |
| 1643 | ip_set_max = max_sets; |
| 1644 | if (ip_set_max >= IPSET_INVALID_ID) |
| 1645 | ip_set_max = IPSET_INVALID_ID - 1; |
| 1646 | |
| 1647 | ip_set_list = kzalloc(sizeof(struct ip_set *) * ip_set_max, |
| 1648 | GFP_KERNEL); |
| 1649 | if (!ip_set_list) { |
| 1650 | pr_err("ip_set: Unable to create ip_set_list\n"); |
| 1651 | return -ENOMEM; |
| 1652 | } |
| 1653 | |
| 1654 | ret = nfnetlink_subsys_register(&ip_set_netlink_subsys); |
| 1655 | if (ret != 0) { |
| 1656 | pr_err("ip_set: cannot register with nfnetlink.\n"); |
| 1657 | kfree(ip_set_list); |
| 1658 | return ret; |
| 1659 | } |
| 1660 | ret = nf_register_sockopt(&so_set); |
| 1661 | if (ret != 0) { |
| 1662 | pr_err("SO_SET registry failed: %d\n", ret); |
| 1663 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); |
| 1664 | kfree(ip_set_list); |
| 1665 | return ret; |
| 1666 | } |
| 1667 | |
| 1668 | pr_notice("ip_set: protocol %u\n", IPSET_PROTOCOL); |
| 1669 | return 0; |
| 1670 | } |
| 1671 | |
| 1672 | static void __exit |
| 1673 | ip_set_fini(void) |
| 1674 | { |
| 1675 | /* There can't be any existing set */ |
| 1676 | nf_unregister_sockopt(&so_set); |
| 1677 | nfnetlink_subsys_unregister(&ip_set_netlink_subsys); |
| 1678 | kfree(ip_set_list); |
| 1679 | pr_debug("these are the famous last words\n"); |
| 1680 | } |
| 1681 | |
| 1682 | module_init(ip_set_init); |
| 1683 | module_exit(ip_set_fini); |