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 unsigned 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)(struct ip_set *, 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->skbinfo.skbmark = fullmark >> 32; 430 ext->skbinfo.skbmarkmask = fullmark & 0xffffffff; 431 } 432 if (tb[IPSET_ATTR_SKBPRIO]) { 433 if (!SET_WITH_SKBINFO(set)) 434 return -IPSET_ERR_SKBINFO; 435 ext->skbinfo.skbprio = 436 be32_to_cpu(nla_get_be32(tb[IPSET_ATTR_SKBPRIO])); 437 } 438 if (tb[IPSET_ATTR_SKBQUEUE]) { 439 if (!SET_WITH_SKBINFO(set)) 440 return -IPSET_ERR_SKBINFO; 441 ext->skbinfo.skbqueue = 442 be16_to_cpu(nla_get_be16(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 /* set->ref can be swapped out by ip_set_swap, netlink events (like dump) need 501 * a separate reference counter 502 */ 503 static inline void 504 __ip_set_get_netlink(struct ip_set *set) 505 { 506 write_lock_bh(&ip_set_ref_lock); 507 set->ref_netlink++; 508 write_unlock_bh(&ip_set_ref_lock); 509 } 510 511 static inline void 512 __ip_set_put_netlink(struct ip_set *set) 513 { 514 write_lock_bh(&ip_set_ref_lock); 515 BUG_ON(set->ref_netlink == 0); 516 set->ref_netlink--; 517 write_unlock_bh(&ip_set_ref_lock); 518 } 519 520 /* Add, del and test set entries from kernel. 521 * 522 * The set behind the index must exist and must be referenced 523 * so it can't be destroyed (or changed) under our foot. 524 */ 525 526 static inline struct ip_set * 527 ip_set_rcu_get(struct net *net, ip_set_id_t index) 528 { 529 struct ip_set *set; 530 struct ip_set_net *inst = ip_set_pernet(net); 531 532 rcu_read_lock(); 533 /* ip_set_list itself needs to be protected */ 534 set = rcu_dereference(inst->ip_set_list)[index]; 535 rcu_read_unlock(); 536 537 return set; 538 } 539 540 int 541 ip_set_test(ip_set_id_t index, const struct sk_buff *skb, 542 const struct xt_action_param *par, struct ip_set_adt_opt *opt) 543 { 544 struct ip_set *set = ip_set_rcu_get(xt_net(par), index); 545 int ret = 0; 546 547 BUG_ON(!set); 548 pr_debug("set %s, index %u\n", set->name, index); 549 550 if (opt->dim < set->type->dimension || 551 !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) 552 return 0; 553 554 rcu_read_lock_bh(); 555 ret = set->variant->kadt(set, skb, par, IPSET_TEST, opt); 556 rcu_read_unlock_bh(); 557 558 if (ret == -EAGAIN) { 559 /* Type requests element to be completed */ 560 pr_debug("element must be completed, ADD is triggered\n"); 561 spin_lock_bh(&set->lock); 562 set->variant->kadt(set, skb, par, IPSET_ADD, opt); 563 spin_unlock_bh(&set->lock); 564 ret = 1; 565 } else { 566 /* --return-nomatch: invert matched element */ 567 if ((opt->cmdflags & IPSET_FLAG_RETURN_NOMATCH) && 568 (set->type->features & IPSET_TYPE_NOMATCH) && 569 (ret > 0 || ret == -ENOTEMPTY)) 570 ret = -ret; 571 } 572 573 /* Convert error codes to nomatch */ 574 return (ret < 0 ? 0 : ret); 575 } 576 EXPORT_SYMBOL_GPL(ip_set_test); 577 578 int 579 ip_set_add(ip_set_id_t index, const struct sk_buff *skb, 580 const struct xt_action_param *par, struct ip_set_adt_opt *opt) 581 { 582 struct ip_set *set = ip_set_rcu_get(xt_net(par), index); 583 int ret; 584 585 BUG_ON(!set); 586 pr_debug("set %s, index %u\n", set->name, index); 587 588 if (opt->dim < set->type->dimension || 589 !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) 590 return -IPSET_ERR_TYPE_MISMATCH; 591 592 spin_lock_bh(&set->lock); 593 ret = set->variant->kadt(set, skb, par, IPSET_ADD, opt); 594 spin_unlock_bh(&set->lock); 595 596 return ret; 597 } 598 EXPORT_SYMBOL_GPL(ip_set_add); 599 600 int 601 ip_set_del(ip_set_id_t index, const struct sk_buff *skb, 602 const struct xt_action_param *par, struct ip_set_adt_opt *opt) 603 { 604 struct ip_set *set = ip_set_rcu_get(xt_net(par), index); 605 int ret = 0; 606 607 BUG_ON(!set); 608 pr_debug("set %s, index %u\n", set->name, index); 609 610 if (opt->dim < set->type->dimension || 611 !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) 612 return -IPSET_ERR_TYPE_MISMATCH; 613 614 spin_lock_bh(&set->lock); 615 ret = set->variant->kadt(set, skb, par, IPSET_DEL, opt); 616 spin_unlock_bh(&set->lock); 617 618 return ret; 619 } 620 EXPORT_SYMBOL_GPL(ip_set_del); 621 622 /* Find set by name, reference it once. The reference makes sure the 623 * thing pointed to, does not go away under our feet. 624 * 625 */ 626 ip_set_id_t 627 ip_set_get_byname(struct net *net, const char *name, struct ip_set **set) 628 { 629 ip_set_id_t i, index = IPSET_INVALID_ID; 630 struct ip_set *s; 631 struct ip_set_net *inst = ip_set_pernet(net); 632 633 rcu_read_lock(); 634 for (i = 0; i < inst->ip_set_max; i++) { 635 s = rcu_dereference(inst->ip_set_list)[i]; 636 if (s && STRNCMP(s->name, name)) { 637 __ip_set_get(s); 638 index = i; 639 *set = s; 640 break; 641 } 642 } 643 rcu_read_unlock(); 644 645 return index; 646 } 647 EXPORT_SYMBOL_GPL(ip_set_get_byname); 648 649 /* If the given set pointer points to a valid set, decrement 650 * reference count by 1. The caller shall not assume the index 651 * to be valid, after calling this function. 652 * 653 */ 654 655 static inline void 656 __ip_set_put_byindex(struct ip_set_net *inst, ip_set_id_t index) 657 { 658 struct ip_set *set; 659 660 rcu_read_lock(); 661 set = rcu_dereference(inst->ip_set_list)[index]; 662 if (set) 663 __ip_set_put(set); 664 rcu_read_unlock(); 665 } 666 667 void 668 ip_set_put_byindex(struct net *net, ip_set_id_t index) 669 { 670 struct ip_set_net *inst = ip_set_pernet(net); 671 672 __ip_set_put_byindex(inst, index); 673 } 674 EXPORT_SYMBOL_GPL(ip_set_put_byindex); 675 676 /* Get the name of a set behind a set index. 677 * We assume the set is referenced, so it does exist and 678 * can't be destroyed. The set cannot be renamed due to 679 * the referencing either. 680 * 681 */ 682 const char * 683 ip_set_name_byindex(struct net *net, ip_set_id_t index) 684 { 685 const struct ip_set *set = ip_set_rcu_get(net, index); 686 687 BUG_ON(!set); 688 BUG_ON(set->ref == 0); 689 690 /* Referenced, so it's safe */ 691 return set->name; 692 } 693 EXPORT_SYMBOL_GPL(ip_set_name_byindex); 694 695 /* Routines to call by external subsystems, which do not 696 * call nfnl_lock for us. 697 */ 698 699 /* Find set by index, reference it once. The reference makes sure the 700 * thing pointed to, does not go away under our feet. 701 * 702 * The nfnl mutex is used in the function. 703 */ 704 ip_set_id_t 705 ip_set_nfnl_get_byindex(struct net *net, ip_set_id_t index) 706 { 707 struct ip_set *set; 708 struct ip_set_net *inst = ip_set_pernet(net); 709 710 if (index >= inst->ip_set_max) 711 return IPSET_INVALID_ID; 712 713 nfnl_lock(NFNL_SUBSYS_IPSET); 714 set = ip_set(inst, index); 715 if (set) 716 __ip_set_get(set); 717 else 718 index = IPSET_INVALID_ID; 719 nfnl_unlock(NFNL_SUBSYS_IPSET); 720 721 return index; 722 } 723 EXPORT_SYMBOL_GPL(ip_set_nfnl_get_byindex); 724 725 /* If the given set pointer points to a valid set, decrement 726 * reference count by 1. The caller shall not assume the index 727 * to be valid, after calling this function. 728 * 729 * The nfnl mutex is used in the function. 730 */ 731 void 732 ip_set_nfnl_put(struct net *net, ip_set_id_t index) 733 { 734 struct ip_set *set; 735 struct ip_set_net *inst = ip_set_pernet(net); 736 737 nfnl_lock(NFNL_SUBSYS_IPSET); 738 if (!inst->is_deleted) { /* already deleted from ip_set_net_exit() */ 739 set = ip_set(inst, index); 740 if (set) 741 __ip_set_put(set); 742 } 743 nfnl_unlock(NFNL_SUBSYS_IPSET); 744 } 745 EXPORT_SYMBOL_GPL(ip_set_nfnl_put); 746 747 /* Communication protocol with userspace over netlink. 748 * 749 * The commands are serialized by the nfnl mutex. 750 */ 751 752 static inline bool 753 protocol_failed(const struct nlattr * const tb[]) 754 { 755 return !tb[IPSET_ATTR_PROTOCOL] || 756 nla_get_u8(tb[IPSET_ATTR_PROTOCOL]) != IPSET_PROTOCOL; 757 } 758 759 static inline u32 760 flag_exist(const struct nlmsghdr *nlh) 761 { 762 return nlh->nlmsg_flags & NLM_F_EXCL ? 0 : IPSET_FLAG_EXIST; 763 } 764 765 static struct nlmsghdr * 766 start_msg(struct sk_buff *skb, u32 portid, u32 seq, unsigned int flags, 767 enum ipset_cmd cmd) 768 { 769 struct nlmsghdr *nlh; 770 struct nfgenmsg *nfmsg; 771 772 nlh = nlmsg_put(skb, portid, seq, cmd | (NFNL_SUBSYS_IPSET << 8), 773 sizeof(*nfmsg), flags); 774 if (!nlh) 775 return NULL; 776 777 nfmsg = nlmsg_data(nlh); 778 nfmsg->nfgen_family = NFPROTO_IPV4; 779 nfmsg->version = NFNETLINK_V0; 780 nfmsg->res_id = 0; 781 782 return nlh; 783 } 784 785 /* Create a set */ 786 787 static const struct nla_policy ip_set_create_policy[IPSET_ATTR_CMD_MAX + 1] = { 788 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 789 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 790 .len = IPSET_MAXNAMELEN - 1 }, 791 [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, 792 .len = IPSET_MAXNAMELEN - 1}, 793 [IPSET_ATTR_REVISION] = { .type = NLA_U8 }, 794 [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, 795 [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, 796 }; 797 798 static struct ip_set * 799 find_set_and_id(struct ip_set_net *inst, const char *name, ip_set_id_t *id) 800 { 801 struct ip_set *set = NULL; 802 ip_set_id_t i; 803 804 *id = IPSET_INVALID_ID; 805 for (i = 0; i < inst->ip_set_max; i++) { 806 set = ip_set(inst, i); 807 if (set && STRNCMP(set->name, name)) { 808 *id = i; 809 break; 810 } 811 } 812 return (*id == IPSET_INVALID_ID ? NULL : set); 813 } 814 815 static inline struct ip_set * 816 find_set(struct ip_set_net *inst, const char *name) 817 { 818 ip_set_id_t id; 819 820 return find_set_and_id(inst, name, &id); 821 } 822 823 static int 824 find_free_id(struct ip_set_net *inst, const char *name, ip_set_id_t *index, 825 struct ip_set **set) 826 { 827 struct ip_set *s; 828 ip_set_id_t i; 829 830 *index = IPSET_INVALID_ID; 831 for (i = 0; i < inst->ip_set_max; i++) { 832 s = ip_set(inst, i); 833 if (!s) { 834 if (*index == IPSET_INVALID_ID) 835 *index = i; 836 } else if (STRNCMP(name, s->name)) { 837 /* Name clash */ 838 *set = s; 839 return -EEXIST; 840 } 841 } 842 if (*index == IPSET_INVALID_ID) 843 /* No free slot remained */ 844 return -IPSET_ERR_MAX_SETS; 845 return 0; 846 } 847 848 static int ip_set_none(struct net *net, struct sock *ctnl, struct sk_buff *skb, 849 const struct nlmsghdr *nlh, 850 const struct nlattr * const attr[]) 851 { 852 return -EOPNOTSUPP; 853 } 854 855 static int ip_set_create(struct net *net, struct sock *ctnl, 856 struct sk_buff *skb, const struct nlmsghdr *nlh, 857 const struct nlattr * const attr[]) 858 { 859 struct ip_set_net *inst = ip_set_pernet(net); 860 struct ip_set *set, *clash = NULL; 861 ip_set_id_t index = IPSET_INVALID_ID; 862 struct nlattr *tb[IPSET_ATTR_CREATE_MAX + 1] = {}; 863 const char *name, *typename; 864 u8 family, revision; 865 u32 flags = flag_exist(nlh); 866 int ret = 0; 867 868 if (unlikely(protocol_failed(attr) || 869 !attr[IPSET_ATTR_SETNAME] || 870 !attr[IPSET_ATTR_TYPENAME] || 871 !attr[IPSET_ATTR_REVISION] || 872 !attr[IPSET_ATTR_FAMILY] || 873 (attr[IPSET_ATTR_DATA] && 874 !flag_nested(attr[IPSET_ATTR_DATA])))) 875 return -IPSET_ERR_PROTOCOL; 876 877 name = nla_data(attr[IPSET_ATTR_SETNAME]); 878 typename = nla_data(attr[IPSET_ATTR_TYPENAME]); 879 family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); 880 revision = nla_get_u8(attr[IPSET_ATTR_REVISION]); 881 pr_debug("setname: %s, typename: %s, family: %s, revision: %u\n", 882 name, typename, family_name(family), revision); 883 884 /* First, and without any locks, allocate and initialize 885 * a normal base set structure. 886 */ 887 set = kzalloc(sizeof(*set), GFP_KERNEL); 888 if (!set) 889 return -ENOMEM; 890 spin_lock_init(&set->lock); 891 strlcpy(set->name, name, IPSET_MAXNAMELEN); 892 set->family = family; 893 set->revision = revision; 894 895 /* Next, check that we know the type, and take 896 * a reference on the type, to make sure it stays available 897 * while constructing our new set. 898 * 899 * After referencing the type, we try to create the type 900 * specific part of the set without holding any locks. 901 */ 902 ret = find_set_type_get(typename, family, revision, &set->type); 903 if (ret) 904 goto out; 905 906 /* Without holding any locks, create private part. */ 907 if (attr[IPSET_ATTR_DATA] && 908 nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA], 909 set->type->create_policy)) { 910 ret = -IPSET_ERR_PROTOCOL; 911 goto put_out; 912 } 913 914 ret = set->type->create(net, set, tb, flags); 915 if (ret != 0) 916 goto put_out; 917 918 /* BTW, ret==0 here. */ 919 920 /* Here, we have a valid, constructed set and we are protected 921 * by the nfnl mutex. Find the first free index in ip_set_list 922 * and check clashing. 923 */ 924 ret = find_free_id(inst, set->name, &index, &clash); 925 if (ret == -EEXIST) { 926 /* If this is the same set and requested, ignore error */ 927 if ((flags & IPSET_FLAG_EXIST) && 928 STRNCMP(set->type->name, clash->type->name) && 929 set->type->family == clash->type->family && 930 set->type->revision_min == clash->type->revision_min && 931 set->type->revision_max == clash->type->revision_max && 932 set->variant->same_set(set, clash)) 933 ret = 0; 934 goto cleanup; 935 } else if (ret == -IPSET_ERR_MAX_SETS) { 936 struct ip_set **list, **tmp; 937 ip_set_id_t i = inst->ip_set_max + IP_SET_INC; 938 939 if (i < inst->ip_set_max || i == IPSET_INVALID_ID) 940 /* Wraparound */ 941 goto cleanup; 942 943 list = kcalloc(i, sizeof(struct ip_set *), GFP_KERNEL); 944 if (!list) 945 goto cleanup; 946 /* nfnl mutex is held, both lists are valid */ 947 tmp = ip_set_dereference(inst->ip_set_list); 948 memcpy(list, tmp, sizeof(struct ip_set *) * inst->ip_set_max); 949 rcu_assign_pointer(inst->ip_set_list, list); 950 /* Make sure all current packets have passed through */ 951 synchronize_net(); 952 /* Use new list */ 953 index = inst->ip_set_max; 954 inst->ip_set_max = i; 955 kfree(tmp); 956 ret = 0; 957 } else if (ret) { 958 goto cleanup; 959 } 960 961 /* Finally! Add our shiny new set to the list, and be done. */ 962 pr_debug("create: '%s' created with index %u!\n", set->name, index); 963 ip_set(inst, index) = set; 964 965 return ret; 966 967 cleanup: 968 set->variant->destroy(set); 969 put_out: 970 module_put(set->type->me); 971 out: 972 kfree(set); 973 return ret; 974 } 975 976 /* Destroy sets */ 977 978 static const struct nla_policy 979 ip_set_setname_policy[IPSET_ATTR_CMD_MAX + 1] = { 980 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 981 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 982 .len = IPSET_MAXNAMELEN - 1 }, 983 }; 984 985 static void 986 ip_set_destroy_set(struct ip_set *set) 987 { 988 pr_debug("set: %s\n", set->name); 989 990 /* Must call it without holding any lock */ 991 set->variant->destroy(set); 992 module_put(set->type->me); 993 kfree(set); 994 } 995 996 static int ip_set_destroy(struct net *net, struct sock *ctnl, 997 struct sk_buff *skb, const struct nlmsghdr *nlh, 998 const struct nlattr * const attr[]) 999 { 1000 struct ip_set_net *inst = ip_set_pernet(net); 1001 struct ip_set *s; 1002 ip_set_id_t i; 1003 int ret = 0; 1004 1005 if (unlikely(protocol_failed(attr))) 1006 return -IPSET_ERR_PROTOCOL; 1007 1008 /* Must wait for flush to be really finished in list:set */ 1009 rcu_barrier(); 1010 1011 /* Commands are serialized and references are 1012 * protected by the ip_set_ref_lock. 1013 * External systems (i.e. xt_set) must call 1014 * ip_set_put|get_nfnl_* functions, that way we 1015 * can safely check references here. 1016 * 1017 * list:set timer can only decrement the reference 1018 * counter, so if it's already zero, we can proceed 1019 * without holding the lock. 1020 */ 1021 read_lock_bh(&ip_set_ref_lock); 1022 if (!attr[IPSET_ATTR_SETNAME]) { 1023 for (i = 0; i < inst->ip_set_max; i++) { 1024 s = ip_set(inst, i); 1025 if (s && (s->ref || s->ref_netlink)) { 1026 ret = -IPSET_ERR_BUSY; 1027 goto out; 1028 } 1029 } 1030 inst->is_destroyed = true; 1031 read_unlock_bh(&ip_set_ref_lock); 1032 for (i = 0; i < inst->ip_set_max; i++) { 1033 s = ip_set(inst, i); 1034 if (s) { 1035 ip_set(inst, i) = NULL; 1036 ip_set_destroy_set(s); 1037 } 1038 } 1039 /* Modified by ip_set_destroy() only, which is serialized */ 1040 inst->is_destroyed = false; 1041 } else { 1042 s = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), 1043 &i); 1044 if (!s) { 1045 ret = -ENOENT; 1046 goto out; 1047 } else if (s->ref || s->ref_netlink) { 1048 ret = -IPSET_ERR_BUSY; 1049 goto out; 1050 } 1051 ip_set(inst, i) = NULL; 1052 read_unlock_bh(&ip_set_ref_lock); 1053 1054 ip_set_destroy_set(s); 1055 } 1056 return 0; 1057 out: 1058 read_unlock_bh(&ip_set_ref_lock); 1059 return ret; 1060 } 1061 1062 /* Flush sets */ 1063 1064 static void 1065 ip_set_flush_set(struct ip_set *set) 1066 { 1067 pr_debug("set: %s\n", set->name); 1068 1069 spin_lock_bh(&set->lock); 1070 set->variant->flush(set); 1071 spin_unlock_bh(&set->lock); 1072 } 1073 1074 static int ip_set_flush(struct net *net, struct sock *ctnl, struct sk_buff *skb, 1075 const struct nlmsghdr *nlh, 1076 const struct nlattr * const attr[]) 1077 { 1078 struct ip_set_net *inst = ip_set_pernet(net); 1079 struct ip_set *s; 1080 ip_set_id_t i; 1081 1082 if (unlikely(protocol_failed(attr))) 1083 return -IPSET_ERR_PROTOCOL; 1084 1085 if (!attr[IPSET_ATTR_SETNAME]) { 1086 for (i = 0; i < inst->ip_set_max; i++) { 1087 s = ip_set(inst, i); 1088 if (s) 1089 ip_set_flush_set(s); 1090 } 1091 } else { 1092 s = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1093 if (!s) 1094 return -ENOENT; 1095 1096 ip_set_flush_set(s); 1097 } 1098 1099 return 0; 1100 } 1101 1102 /* Rename a set */ 1103 1104 static const struct nla_policy 1105 ip_set_setname2_policy[IPSET_ATTR_CMD_MAX + 1] = { 1106 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1107 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 1108 .len = IPSET_MAXNAMELEN - 1 }, 1109 [IPSET_ATTR_SETNAME2] = { .type = NLA_NUL_STRING, 1110 .len = IPSET_MAXNAMELEN - 1 }, 1111 }; 1112 1113 static int ip_set_rename(struct net *net, struct sock *ctnl, 1114 struct sk_buff *skb, const struct nlmsghdr *nlh, 1115 const struct nlattr * const attr[]) 1116 { 1117 struct ip_set_net *inst = ip_set_pernet(net); 1118 struct ip_set *set, *s; 1119 const char *name2; 1120 ip_set_id_t i; 1121 int ret = 0; 1122 1123 if (unlikely(protocol_failed(attr) || 1124 !attr[IPSET_ATTR_SETNAME] || 1125 !attr[IPSET_ATTR_SETNAME2])) 1126 return -IPSET_ERR_PROTOCOL; 1127 1128 set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1129 if (!set) 1130 return -ENOENT; 1131 1132 read_lock_bh(&ip_set_ref_lock); 1133 if (set->ref != 0) { 1134 ret = -IPSET_ERR_REFERENCED; 1135 goto out; 1136 } 1137 1138 name2 = nla_data(attr[IPSET_ATTR_SETNAME2]); 1139 for (i = 0; i < inst->ip_set_max; i++) { 1140 s = ip_set(inst, i); 1141 if (s && STRNCMP(s->name, name2)) { 1142 ret = -IPSET_ERR_EXIST_SETNAME2; 1143 goto out; 1144 } 1145 } 1146 strncpy(set->name, name2, IPSET_MAXNAMELEN); 1147 1148 out: 1149 read_unlock_bh(&ip_set_ref_lock); 1150 return ret; 1151 } 1152 1153 /* Swap two sets so that name/index points to the other. 1154 * References and set names are also swapped. 1155 * 1156 * The commands are serialized by the nfnl mutex and references are 1157 * protected by the ip_set_ref_lock. The kernel interfaces 1158 * do not hold the mutex but the pointer settings are atomic 1159 * so the ip_set_list always contains valid pointers to the sets. 1160 */ 1161 1162 static int ip_set_swap(struct net *net, struct sock *ctnl, struct sk_buff *skb, 1163 const struct nlmsghdr *nlh, 1164 const struct nlattr * const attr[]) 1165 { 1166 struct ip_set_net *inst = ip_set_pernet(net); 1167 struct ip_set *from, *to; 1168 ip_set_id_t from_id, to_id; 1169 char from_name[IPSET_MAXNAMELEN]; 1170 1171 if (unlikely(protocol_failed(attr) || 1172 !attr[IPSET_ATTR_SETNAME] || 1173 !attr[IPSET_ATTR_SETNAME2])) 1174 return -IPSET_ERR_PROTOCOL; 1175 1176 from = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), 1177 &from_id); 1178 if (!from) 1179 return -ENOENT; 1180 1181 to = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME2]), 1182 &to_id); 1183 if (!to) 1184 return -IPSET_ERR_EXIST_SETNAME2; 1185 1186 /* Features must not change. 1187 * Not an artifical restriction anymore, as we must prevent 1188 * possible loops created by swapping in setlist type of sets. 1189 */ 1190 if (!(from->type->features == to->type->features && 1191 from->family == to->family)) 1192 return -IPSET_ERR_TYPE_MISMATCH; 1193 1194 if (from->ref_netlink || to->ref_netlink) 1195 return -EBUSY; 1196 1197 strncpy(from_name, from->name, IPSET_MAXNAMELEN); 1198 strncpy(from->name, to->name, IPSET_MAXNAMELEN); 1199 strncpy(to->name, from_name, IPSET_MAXNAMELEN); 1200 1201 write_lock_bh(&ip_set_ref_lock); 1202 swap(from->ref, to->ref); 1203 ip_set(inst, from_id) = to; 1204 ip_set(inst, to_id) = from; 1205 write_unlock_bh(&ip_set_ref_lock); 1206 1207 return 0; 1208 } 1209 1210 /* List/save set data */ 1211 1212 #define DUMP_INIT 0 1213 #define DUMP_ALL 1 1214 #define DUMP_ONE 2 1215 #define DUMP_LAST 3 1216 1217 #define DUMP_TYPE(arg) (((u32)(arg)) & 0x0000FFFF) 1218 #define DUMP_FLAGS(arg) (((u32)(arg)) >> 16) 1219 1220 static int 1221 ip_set_dump_done(struct netlink_callback *cb) 1222 { 1223 if (cb->args[IPSET_CB_ARG0]) { 1224 struct ip_set_net *inst = 1225 (struct ip_set_net *)cb->args[IPSET_CB_NET]; 1226 ip_set_id_t index = (ip_set_id_t)cb->args[IPSET_CB_INDEX]; 1227 struct ip_set *set = ip_set(inst, index); 1228 1229 if (set->variant->uref) 1230 set->variant->uref(set, cb, false); 1231 pr_debug("release set %s\n", set->name); 1232 __ip_set_put_netlink(set); 1233 } 1234 return 0; 1235 } 1236 1237 static inline void 1238 dump_attrs(struct nlmsghdr *nlh) 1239 { 1240 const struct nlattr *attr; 1241 int rem; 1242 1243 pr_debug("dump nlmsg\n"); 1244 nlmsg_for_each_attr(attr, nlh, sizeof(struct nfgenmsg), rem) { 1245 pr_debug("type: %u, len %u\n", nla_type(attr), attr->nla_len); 1246 } 1247 } 1248 1249 static int 1250 dump_init(struct netlink_callback *cb, struct ip_set_net *inst) 1251 { 1252 struct nlmsghdr *nlh = nlmsg_hdr(cb->skb); 1253 int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); 1254 struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1]; 1255 struct nlattr *attr = (void *)nlh + min_len; 1256 u32 dump_type; 1257 ip_set_id_t index; 1258 1259 /* Second pass, so parser can't fail */ 1260 nla_parse(cda, IPSET_ATTR_CMD_MAX, 1261 attr, nlh->nlmsg_len - min_len, ip_set_setname_policy); 1262 1263 if (cda[IPSET_ATTR_SETNAME]) { 1264 struct ip_set *set; 1265 1266 set = find_set_and_id(inst, nla_data(cda[IPSET_ATTR_SETNAME]), 1267 &index); 1268 if (!set) 1269 return -ENOENT; 1270 1271 dump_type = DUMP_ONE; 1272 cb->args[IPSET_CB_INDEX] = index; 1273 } else { 1274 dump_type = DUMP_ALL; 1275 } 1276 1277 if (cda[IPSET_ATTR_FLAGS]) { 1278 u32 f = ip_set_get_h32(cda[IPSET_ATTR_FLAGS]); 1279 1280 dump_type |= (f << 16); 1281 } 1282 cb->args[IPSET_CB_NET] = (unsigned long)inst; 1283 cb->args[IPSET_CB_DUMP] = dump_type; 1284 1285 return 0; 1286 } 1287 1288 static int 1289 ip_set_dump_start(struct sk_buff *skb, struct netlink_callback *cb) 1290 { 1291 ip_set_id_t index = IPSET_INVALID_ID, max; 1292 struct ip_set *set = NULL; 1293 struct nlmsghdr *nlh = NULL; 1294 unsigned int flags = NETLINK_CB(cb->skb).portid ? NLM_F_MULTI : 0; 1295 struct ip_set_net *inst = ip_set_pernet(sock_net(skb->sk)); 1296 u32 dump_type, dump_flags; 1297 bool is_destroyed; 1298 int ret = 0; 1299 1300 if (!cb->args[IPSET_CB_DUMP]) { 1301 ret = dump_init(cb, inst); 1302 if (ret < 0) { 1303 nlh = nlmsg_hdr(cb->skb); 1304 /* We have to create and send the error message 1305 * manually :-( 1306 */ 1307 if (nlh->nlmsg_flags & NLM_F_ACK) 1308 netlink_ack(cb->skb, nlh, ret); 1309 return ret; 1310 } 1311 } 1312 1313 if (cb->args[IPSET_CB_INDEX] >= inst->ip_set_max) 1314 goto out; 1315 1316 dump_type = DUMP_TYPE(cb->args[IPSET_CB_DUMP]); 1317 dump_flags = DUMP_FLAGS(cb->args[IPSET_CB_DUMP]); 1318 max = dump_type == DUMP_ONE ? cb->args[IPSET_CB_INDEX] + 1 1319 : inst->ip_set_max; 1320 dump_last: 1321 pr_debug("dump type, flag: %u %u index: %ld\n", 1322 dump_type, dump_flags, cb->args[IPSET_CB_INDEX]); 1323 for (; cb->args[IPSET_CB_INDEX] < max; cb->args[IPSET_CB_INDEX]++) { 1324 index = (ip_set_id_t)cb->args[IPSET_CB_INDEX]; 1325 write_lock_bh(&ip_set_ref_lock); 1326 set = ip_set(inst, index); 1327 is_destroyed = inst->is_destroyed; 1328 if (!set || is_destroyed) { 1329 write_unlock_bh(&ip_set_ref_lock); 1330 if (dump_type == DUMP_ONE) { 1331 ret = -ENOENT; 1332 goto out; 1333 } 1334 if (is_destroyed) { 1335 /* All sets are just being destroyed */ 1336 ret = 0; 1337 goto out; 1338 } 1339 continue; 1340 } 1341 /* When dumping all sets, we must dump "sorted" 1342 * so that lists (unions of sets) are dumped last. 1343 */ 1344 if (dump_type != DUMP_ONE && 1345 ((dump_type == DUMP_ALL) == 1346 !!(set->type->features & IPSET_DUMP_LAST))) { 1347 write_unlock_bh(&ip_set_ref_lock); 1348 continue; 1349 } 1350 pr_debug("List set: %s\n", set->name); 1351 if (!cb->args[IPSET_CB_ARG0]) { 1352 /* Start listing: make sure set won't be destroyed */ 1353 pr_debug("reference set\n"); 1354 set->ref_netlink++; 1355 } 1356 write_unlock_bh(&ip_set_ref_lock); 1357 nlh = start_msg(skb, NETLINK_CB(cb->skb).portid, 1358 cb->nlh->nlmsg_seq, flags, 1359 IPSET_CMD_LIST); 1360 if (!nlh) { 1361 ret = -EMSGSIZE; 1362 goto release_refcount; 1363 } 1364 if (nla_put_u8(skb, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || 1365 nla_put_string(skb, IPSET_ATTR_SETNAME, set->name)) 1366 goto nla_put_failure; 1367 if (dump_flags & IPSET_FLAG_LIST_SETNAME) 1368 goto next_set; 1369 switch (cb->args[IPSET_CB_ARG0]) { 1370 case 0: 1371 /* Core header data */ 1372 if (nla_put_string(skb, IPSET_ATTR_TYPENAME, 1373 set->type->name) || 1374 nla_put_u8(skb, IPSET_ATTR_FAMILY, 1375 set->family) || 1376 nla_put_u8(skb, IPSET_ATTR_REVISION, 1377 set->revision)) 1378 goto nla_put_failure; 1379 ret = set->variant->head(set, skb); 1380 if (ret < 0) 1381 goto release_refcount; 1382 if (dump_flags & IPSET_FLAG_LIST_HEADER) 1383 goto next_set; 1384 if (set->variant->uref) 1385 set->variant->uref(set, cb, true); 1386 /* Fall through and add elements */ 1387 default: 1388 rcu_read_lock_bh(); 1389 ret = set->variant->list(set, skb, cb); 1390 rcu_read_unlock_bh(); 1391 if (!cb->args[IPSET_CB_ARG0]) 1392 /* Set is done, proceed with next one */ 1393 goto next_set; 1394 goto release_refcount; 1395 } 1396 } 1397 /* If we dump all sets, continue with dumping last ones */ 1398 if (dump_type == DUMP_ALL) { 1399 dump_type = DUMP_LAST; 1400 cb->args[IPSET_CB_DUMP] = dump_type | (dump_flags << 16); 1401 cb->args[IPSET_CB_INDEX] = 0; 1402 if (set && set->variant->uref) 1403 set->variant->uref(set, cb, false); 1404 goto dump_last; 1405 } 1406 goto out; 1407 1408 nla_put_failure: 1409 ret = -EFAULT; 1410 next_set: 1411 if (dump_type == DUMP_ONE) 1412 cb->args[IPSET_CB_INDEX] = IPSET_INVALID_ID; 1413 else 1414 cb->args[IPSET_CB_INDEX]++; 1415 release_refcount: 1416 /* If there was an error or set is done, release set */ 1417 if (ret || !cb->args[IPSET_CB_ARG0]) { 1418 set = ip_set(inst, index); 1419 if (set->variant->uref) 1420 set->variant->uref(set, cb, false); 1421 pr_debug("release set %s\n", set->name); 1422 __ip_set_put_netlink(set); 1423 cb->args[IPSET_CB_ARG0] = 0; 1424 } 1425 out: 1426 if (nlh) { 1427 nlmsg_end(skb, nlh); 1428 pr_debug("nlmsg_len: %u\n", nlh->nlmsg_len); 1429 dump_attrs(nlh); 1430 } 1431 1432 return ret < 0 ? ret : skb->len; 1433 } 1434 1435 static int ip_set_dump(struct net *net, struct sock *ctnl, struct sk_buff *skb, 1436 const struct nlmsghdr *nlh, 1437 const struct nlattr * const attr[]) 1438 { 1439 if (unlikely(protocol_failed(attr))) 1440 return -IPSET_ERR_PROTOCOL; 1441 1442 { 1443 struct netlink_dump_control c = { 1444 .dump = ip_set_dump_start, 1445 .done = ip_set_dump_done, 1446 }; 1447 return netlink_dump_start(ctnl, skb, nlh, &c); 1448 } 1449 } 1450 1451 /* Add, del and test */ 1452 1453 static const struct nla_policy ip_set_adt_policy[IPSET_ATTR_CMD_MAX + 1] = { 1454 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1455 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 1456 .len = IPSET_MAXNAMELEN - 1 }, 1457 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 1458 [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, 1459 [IPSET_ATTR_ADT] = { .type = NLA_NESTED }, 1460 }; 1461 1462 static int 1463 call_ad(struct sock *ctnl, struct sk_buff *skb, struct ip_set *set, 1464 struct nlattr *tb[], enum ipset_adt adt, 1465 u32 flags, bool use_lineno) 1466 { 1467 int ret; 1468 u32 lineno = 0; 1469 bool eexist = flags & IPSET_FLAG_EXIST, retried = false; 1470 1471 do { 1472 spin_lock_bh(&set->lock); 1473 ret = set->variant->uadt(set, tb, adt, &lineno, flags, retried); 1474 spin_unlock_bh(&set->lock); 1475 retried = true; 1476 } while (ret == -EAGAIN && 1477 set->variant->resize && 1478 (ret = set->variant->resize(set, retried)) == 0); 1479 1480 if (!ret || (ret == -IPSET_ERR_EXIST && eexist)) 1481 return 0; 1482 if (lineno && use_lineno) { 1483 /* Error in restore/batch mode: send back lineno */ 1484 struct nlmsghdr *rep, *nlh = nlmsg_hdr(skb); 1485 struct sk_buff *skb2; 1486 struct nlmsgerr *errmsg; 1487 size_t payload = min(SIZE_MAX, 1488 sizeof(*errmsg) + nlmsg_len(nlh)); 1489 int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); 1490 struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1]; 1491 struct nlattr *cmdattr; 1492 u32 *errline; 1493 1494 skb2 = nlmsg_new(payload, GFP_KERNEL); 1495 if (!skb2) 1496 return -ENOMEM; 1497 rep = __nlmsg_put(skb2, NETLINK_CB(skb).portid, 1498 nlh->nlmsg_seq, NLMSG_ERROR, payload, 0); 1499 errmsg = nlmsg_data(rep); 1500 errmsg->error = ret; 1501 memcpy(&errmsg->msg, nlh, nlh->nlmsg_len); 1502 cmdattr = (void *)&errmsg->msg + min_len; 1503 1504 nla_parse(cda, IPSET_ATTR_CMD_MAX, 1505 cmdattr, nlh->nlmsg_len - min_len, 1506 ip_set_adt_policy); 1507 1508 errline = nla_data(cda[IPSET_ATTR_LINENO]); 1509 1510 *errline = lineno; 1511 1512 netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, 1513 MSG_DONTWAIT); 1514 /* Signal netlink not to send its ACK/errmsg. */ 1515 return -EINTR; 1516 } 1517 1518 return ret; 1519 } 1520 1521 static int ip_set_uadd(struct net *net, struct sock *ctnl, struct sk_buff *skb, 1522 const struct nlmsghdr *nlh, 1523 const struct nlattr * const attr[]) 1524 { 1525 struct ip_set_net *inst = ip_set_pernet(net); 1526 struct ip_set *set; 1527 struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; 1528 const struct nlattr *nla; 1529 u32 flags = flag_exist(nlh); 1530 bool use_lineno; 1531 int ret = 0; 1532 1533 if (unlikely(protocol_failed(attr) || 1534 !attr[IPSET_ATTR_SETNAME] || 1535 !((attr[IPSET_ATTR_DATA] != NULL) ^ 1536 (attr[IPSET_ATTR_ADT] != NULL)) || 1537 (attr[IPSET_ATTR_DATA] && 1538 !flag_nested(attr[IPSET_ATTR_DATA])) || 1539 (attr[IPSET_ATTR_ADT] && 1540 (!flag_nested(attr[IPSET_ATTR_ADT]) || 1541 !attr[IPSET_ATTR_LINENO])))) 1542 return -IPSET_ERR_PROTOCOL; 1543 1544 set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1545 if (!set) 1546 return -ENOENT; 1547 1548 use_lineno = !!attr[IPSET_ATTR_LINENO]; 1549 if (attr[IPSET_ATTR_DATA]) { 1550 if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, 1551 attr[IPSET_ATTR_DATA], 1552 set->type->adt_policy)) 1553 return -IPSET_ERR_PROTOCOL; 1554 ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, flags, 1555 use_lineno); 1556 } else { 1557 int nla_rem; 1558 1559 nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { 1560 memset(tb, 0, sizeof(tb)); 1561 if (nla_type(nla) != IPSET_ATTR_DATA || 1562 !flag_nested(nla) || 1563 nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, 1564 set->type->adt_policy)) 1565 return -IPSET_ERR_PROTOCOL; 1566 ret = call_ad(ctnl, skb, set, tb, IPSET_ADD, 1567 flags, use_lineno); 1568 if (ret < 0) 1569 return ret; 1570 } 1571 } 1572 return ret; 1573 } 1574 1575 static int ip_set_udel(struct net *net, struct sock *ctnl, struct sk_buff *skb, 1576 const struct nlmsghdr *nlh, 1577 const struct nlattr * const attr[]) 1578 { 1579 struct ip_set_net *inst = ip_set_pernet(net); 1580 struct ip_set *set; 1581 struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; 1582 const struct nlattr *nla; 1583 u32 flags = flag_exist(nlh); 1584 bool use_lineno; 1585 int ret = 0; 1586 1587 if (unlikely(protocol_failed(attr) || 1588 !attr[IPSET_ATTR_SETNAME] || 1589 !((attr[IPSET_ATTR_DATA] != NULL) ^ 1590 (attr[IPSET_ATTR_ADT] != NULL)) || 1591 (attr[IPSET_ATTR_DATA] && 1592 !flag_nested(attr[IPSET_ATTR_DATA])) || 1593 (attr[IPSET_ATTR_ADT] && 1594 (!flag_nested(attr[IPSET_ATTR_ADT]) || 1595 !attr[IPSET_ATTR_LINENO])))) 1596 return -IPSET_ERR_PROTOCOL; 1597 1598 set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1599 if (!set) 1600 return -ENOENT; 1601 1602 use_lineno = !!attr[IPSET_ATTR_LINENO]; 1603 if (attr[IPSET_ATTR_DATA]) { 1604 if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, 1605 attr[IPSET_ATTR_DATA], 1606 set->type->adt_policy)) 1607 return -IPSET_ERR_PROTOCOL; 1608 ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, flags, 1609 use_lineno); 1610 } else { 1611 int nla_rem; 1612 1613 nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { 1614 memset(tb, 0, sizeof(*tb)); 1615 if (nla_type(nla) != IPSET_ATTR_DATA || 1616 !flag_nested(nla) || 1617 nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, 1618 set->type->adt_policy)) 1619 return -IPSET_ERR_PROTOCOL; 1620 ret = call_ad(ctnl, skb, set, tb, IPSET_DEL, 1621 flags, use_lineno); 1622 if (ret < 0) 1623 return ret; 1624 } 1625 } 1626 return ret; 1627 } 1628 1629 static int ip_set_utest(struct net *net, struct sock *ctnl, struct sk_buff *skb, 1630 const struct nlmsghdr *nlh, 1631 const struct nlattr * const attr[]) 1632 { 1633 struct ip_set_net *inst = ip_set_pernet(net); 1634 struct ip_set *set; 1635 struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; 1636 int ret = 0; 1637 1638 if (unlikely(protocol_failed(attr) || 1639 !attr[IPSET_ATTR_SETNAME] || 1640 !attr[IPSET_ATTR_DATA] || 1641 !flag_nested(attr[IPSET_ATTR_DATA]))) 1642 return -IPSET_ERR_PROTOCOL; 1643 1644 set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1645 if (!set) 1646 return -ENOENT; 1647 1648 if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA], 1649 set->type->adt_policy)) 1650 return -IPSET_ERR_PROTOCOL; 1651 1652 rcu_read_lock_bh(); 1653 ret = set->variant->uadt(set, tb, IPSET_TEST, NULL, 0, 0); 1654 rcu_read_unlock_bh(); 1655 /* Userspace can't trigger element to be re-added */ 1656 if (ret == -EAGAIN) 1657 ret = 1; 1658 1659 return ret > 0 ? 0 : -IPSET_ERR_EXIST; 1660 } 1661 1662 /* Get headed data of a set */ 1663 1664 static int ip_set_header(struct net *net, struct sock *ctnl, 1665 struct sk_buff *skb, const struct nlmsghdr *nlh, 1666 const struct nlattr * const attr[]) 1667 { 1668 struct ip_set_net *inst = ip_set_pernet(net); 1669 const struct ip_set *set; 1670 struct sk_buff *skb2; 1671 struct nlmsghdr *nlh2; 1672 int ret = 0; 1673 1674 if (unlikely(protocol_failed(attr) || 1675 !attr[IPSET_ATTR_SETNAME])) 1676 return -IPSET_ERR_PROTOCOL; 1677 1678 set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1679 if (!set) 1680 return -ENOENT; 1681 1682 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1683 if (!skb2) 1684 return -ENOMEM; 1685 1686 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 1687 IPSET_CMD_HEADER); 1688 if (!nlh2) 1689 goto nlmsg_failure; 1690 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || 1691 nla_put_string(skb2, IPSET_ATTR_SETNAME, set->name) || 1692 nla_put_string(skb2, IPSET_ATTR_TYPENAME, set->type->name) || 1693 nla_put_u8(skb2, IPSET_ATTR_FAMILY, set->family) || 1694 nla_put_u8(skb2, IPSET_ATTR_REVISION, set->revision)) 1695 goto nla_put_failure; 1696 nlmsg_end(skb2, nlh2); 1697 1698 ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); 1699 if (ret < 0) 1700 return ret; 1701 1702 return 0; 1703 1704 nla_put_failure: 1705 nlmsg_cancel(skb2, nlh2); 1706 nlmsg_failure: 1707 kfree_skb(skb2); 1708 return -EMSGSIZE; 1709 } 1710 1711 /* Get type data */ 1712 1713 static const struct nla_policy ip_set_type_policy[IPSET_ATTR_CMD_MAX + 1] = { 1714 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1715 [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, 1716 .len = IPSET_MAXNAMELEN - 1 }, 1717 [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, 1718 }; 1719 1720 static int ip_set_type(struct net *net, struct sock *ctnl, struct sk_buff *skb, 1721 const struct nlmsghdr *nlh, 1722 const struct nlattr * const attr[]) 1723 { 1724 struct sk_buff *skb2; 1725 struct nlmsghdr *nlh2; 1726 u8 family, min, max; 1727 const char *typename; 1728 int ret = 0; 1729 1730 if (unlikely(protocol_failed(attr) || 1731 !attr[IPSET_ATTR_TYPENAME] || 1732 !attr[IPSET_ATTR_FAMILY])) 1733 return -IPSET_ERR_PROTOCOL; 1734 1735 family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); 1736 typename = nla_data(attr[IPSET_ATTR_TYPENAME]); 1737 ret = find_set_type_minmax(typename, family, &min, &max); 1738 if (ret) 1739 return ret; 1740 1741 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1742 if (!skb2) 1743 return -ENOMEM; 1744 1745 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 1746 IPSET_CMD_TYPE); 1747 if (!nlh2) 1748 goto nlmsg_failure; 1749 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL) || 1750 nla_put_string(skb2, IPSET_ATTR_TYPENAME, typename) || 1751 nla_put_u8(skb2, IPSET_ATTR_FAMILY, family) || 1752 nla_put_u8(skb2, IPSET_ATTR_REVISION, max) || 1753 nla_put_u8(skb2, IPSET_ATTR_REVISION_MIN, min)) 1754 goto nla_put_failure; 1755 nlmsg_end(skb2, nlh2); 1756 1757 pr_debug("Send TYPE, nlmsg_len: %u\n", nlh2->nlmsg_len); 1758 ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); 1759 if (ret < 0) 1760 return ret; 1761 1762 return 0; 1763 1764 nla_put_failure: 1765 nlmsg_cancel(skb2, nlh2); 1766 nlmsg_failure: 1767 kfree_skb(skb2); 1768 return -EMSGSIZE; 1769 } 1770 1771 /* Get protocol version */ 1772 1773 static const struct nla_policy 1774 ip_set_protocol_policy[IPSET_ATTR_CMD_MAX + 1] = { 1775 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1776 }; 1777 1778 static int ip_set_protocol(struct net *net, struct sock *ctnl, 1779 struct sk_buff *skb, const struct nlmsghdr *nlh, 1780 const struct nlattr * const attr[]) 1781 { 1782 struct sk_buff *skb2; 1783 struct nlmsghdr *nlh2; 1784 int ret = 0; 1785 1786 if (unlikely(!attr[IPSET_ATTR_PROTOCOL])) 1787 return -IPSET_ERR_PROTOCOL; 1788 1789 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1790 if (!skb2) 1791 return -ENOMEM; 1792 1793 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 1794 IPSET_CMD_PROTOCOL); 1795 if (!nlh2) 1796 goto nlmsg_failure; 1797 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL)) 1798 goto nla_put_failure; 1799 nlmsg_end(skb2, nlh2); 1800 1801 ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); 1802 if (ret < 0) 1803 return ret; 1804 1805 return 0; 1806 1807 nla_put_failure: 1808 nlmsg_cancel(skb2, nlh2); 1809 nlmsg_failure: 1810 kfree_skb(skb2); 1811 return -EMSGSIZE; 1812 } 1813 1814 static const struct nfnl_callback ip_set_netlink_subsys_cb[IPSET_MSG_MAX] = { 1815 [IPSET_CMD_NONE] = { 1816 .call = ip_set_none, 1817 .attr_count = IPSET_ATTR_CMD_MAX, 1818 }, 1819 [IPSET_CMD_CREATE] = { 1820 .call = ip_set_create, 1821 .attr_count = IPSET_ATTR_CMD_MAX, 1822 .policy = ip_set_create_policy, 1823 }, 1824 [IPSET_CMD_DESTROY] = { 1825 .call = ip_set_destroy, 1826 .attr_count = IPSET_ATTR_CMD_MAX, 1827 .policy = ip_set_setname_policy, 1828 }, 1829 [IPSET_CMD_FLUSH] = { 1830 .call = ip_set_flush, 1831 .attr_count = IPSET_ATTR_CMD_MAX, 1832 .policy = ip_set_setname_policy, 1833 }, 1834 [IPSET_CMD_RENAME] = { 1835 .call = ip_set_rename, 1836 .attr_count = IPSET_ATTR_CMD_MAX, 1837 .policy = ip_set_setname2_policy, 1838 }, 1839 [IPSET_CMD_SWAP] = { 1840 .call = ip_set_swap, 1841 .attr_count = IPSET_ATTR_CMD_MAX, 1842 .policy = ip_set_setname2_policy, 1843 }, 1844 [IPSET_CMD_LIST] = { 1845 .call = ip_set_dump, 1846 .attr_count = IPSET_ATTR_CMD_MAX, 1847 .policy = ip_set_setname_policy, 1848 }, 1849 [IPSET_CMD_SAVE] = { 1850 .call = ip_set_dump, 1851 .attr_count = IPSET_ATTR_CMD_MAX, 1852 .policy = ip_set_setname_policy, 1853 }, 1854 [IPSET_CMD_ADD] = { 1855 .call = ip_set_uadd, 1856 .attr_count = IPSET_ATTR_CMD_MAX, 1857 .policy = ip_set_adt_policy, 1858 }, 1859 [IPSET_CMD_DEL] = { 1860 .call = ip_set_udel, 1861 .attr_count = IPSET_ATTR_CMD_MAX, 1862 .policy = ip_set_adt_policy, 1863 }, 1864 [IPSET_CMD_TEST] = { 1865 .call = ip_set_utest, 1866 .attr_count = IPSET_ATTR_CMD_MAX, 1867 .policy = ip_set_adt_policy, 1868 }, 1869 [IPSET_CMD_HEADER] = { 1870 .call = ip_set_header, 1871 .attr_count = IPSET_ATTR_CMD_MAX, 1872 .policy = ip_set_setname_policy, 1873 }, 1874 [IPSET_CMD_TYPE] = { 1875 .call = ip_set_type, 1876 .attr_count = IPSET_ATTR_CMD_MAX, 1877 .policy = ip_set_type_policy, 1878 }, 1879 [IPSET_CMD_PROTOCOL] = { 1880 .call = ip_set_protocol, 1881 .attr_count = IPSET_ATTR_CMD_MAX, 1882 .policy = ip_set_protocol_policy, 1883 }, 1884 }; 1885 1886 static struct nfnetlink_subsystem ip_set_netlink_subsys __read_mostly = { 1887 .name = "ip_set", 1888 .subsys_id = NFNL_SUBSYS_IPSET, 1889 .cb_count = IPSET_MSG_MAX, 1890 .cb = ip_set_netlink_subsys_cb, 1891 }; 1892 1893 /* Interface to iptables/ip6tables */ 1894 1895 static int 1896 ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len) 1897 { 1898 unsigned int *op; 1899 void *data; 1900 int copylen = *len, ret = 0; 1901 struct net *net = sock_net(sk); 1902 struct ip_set_net *inst = ip_set_pernet(net); 1903 1904 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1905 return -EPERM; 1906 if (optval != SO_IP_SET) 1907 return -EBADF; 1908 if (*len < sizeof(unsigned int)) 1909 return -EINVAL; 1910 1911 data = vmalloc(*len); 1912 if (!data) 1913 return -ENOMEM; 1914 if (copy_from_user(data, user, *len) != 0) { 1915 ret = -EFAULT; 1916 goto done; 1917 } 1918 op = (unsigned int *)data; 1919 1920 if (*op < IP_SET_OP_VERSION) { 1921 /* Check the version at the beginning of operations */ 1922 struct ip_set_req_version *req_version = data; 1923 1924 if (*len < sizeof(struct ip_set_req_version)) { 1925 ret = -EINVAL; 1926 goto done; 1927 } 1928 1929 if (req_version->version != IPSET_PROTOCOL) { 1930 ret = -EPROTO; 1931 goto done; 1932 } 1933 } 1934 1935 switch (*op) { 1936 case IP_SET_OP_VERSION: { 1937 struct ip_set_req_version *req_version = data; 1938 1939 if (*len != sizeof(struct ip_set_req_version)) { 1940 ret = -EINVAL; 1941 goto done; 1942 } 1943 1944 req_version->version = IPSET_PROTOCOL; 1945 ret = copy_to_user(user, req_version, 1946 sizeof(struct ip_set_req_version)); 1947 goto done; 1948 } 1949 case IP_SET_OP_GET_BYNAME: { 1950 struct ip_set_req_get_set *req_get = data; 1951 ip_set_id_t id; 1952 1953 if (*len != sizeof(struct ip_set_req_get_set)) { 1954 ret = -EINVAL; 1955 goto done; 1956 } 1957 req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; 1958 nfnl_lock(NFNL_SUBSYS_IPSET); 1959 find_set_and_id(inst, req_get->set.name, &id); 1960 req_get->set.index = id; 1961 nfnl_unlock(NFNL_SUBSYS_IPSET); 1962 goto copy; 1963 } 1964 case IP_SET_OP_GET_FNAME: { 1965 struct ip_set_req_get_set_family *req_get = data; 1966 ip_set_id_t id; 1967 1968 if (*len != sizeof(struct ip_set_req_get_set_family)) { 1969 ret = -EINVAL; 1970 goto done; 1971 } 1972 req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; 1973 nfnl_lock(NFNL_SUBSYS_IPSET); 1974 find_set_and_id(inst, req_get->set.name, &id); 1975 req_get->set.index = id; 1976 if (id != IPSET_INVALID_ID) 1977 req_get->family = ip_set(inst, id)->family; 1978 nfnl_unlock(NFNL_SUBSYS_IPSET); 1979 goto copy; 1980 } 1981 case IP_SET_OP_GET_BYINDEX: { 1982 struct ip_set_req_get_set *req_get = data; 1983 struct ip_set *set; 1984 1985 if (*len != sizeof(struct ip_set_req_get_set) || 1986 req_get->set.index >= inst->ip_set_max) { 1987 ret = -EINVAL; 1988 goto done; 1989 } 1990 nfnl_lock(NFNL_SUBSYS_IPSET); 1991 set = ip_set(inst, req_get->set.index); 1992 strncpy(req_get->set.name, set ? set->name : "", 1993 IPSET_MAXNAMELEN); 1994 nfnl_unlock(NFNL_SUBSYS_IPSET); 1995 goto copy; 1996 } 1997 default: 1998 ret = -EBADMSG; 1999 goto done; 2000 } /* end of switch(op) */ 2001 2002 copy: 2003 ret = copy_to_user(user, data, copylen); 2004 2005 done: 2006 vfree(data); 2007 if (ret > 0) 2008 ret = 0; 2009 return ret; 2010 } 2011 2012 static struct nf_sockopt_ops so_set __read_mostly = { 2013 .pf = PF_INET, 2014 .get_optmin = SO_IP_SET, 2015 .get_optmax = SO_IP_SET + 1, 2016 .get = &ip_set_sockfn_get, 2017 .owner = THIS_MODULE, 2018 }; 2019 2020 static int __net_init 2021 ip_set_net_init(struct net *net) 2022 { 2023 struct ip_set_net *inst = ip_set_pernet(net); 2024 struct ip_set **list; 2025 2026 inst->ip_set_max = max_sets ? max_sets : CONFIG_IP_SET_MAX; 2027 if (inst->ip_set_max >= IPSET_INVALID_ID) 2028 inst->ip_set_max = IPSET_INVALID_ID - 1; 2029 2030 list = kcalloc(inst->ip_set_max, sizeof(struct ip_set *), GFP_KERNEL); 2031 if (!list) 2032 return -ENOMEM; 2033 inst->is_deleted = false; 2034 inst->is_destroyed = false; 2035 rcu_assign_pointer(inst->ip_set_list, list); 2036 return 0; 2037 } 2038 2039 static void __net_exit 2040 ip_set_net_exit(struct net *net) 2041 { 2042 struct ip_set_net *inst = ip_set_pernet(net); 2043 2044 struct ip_set *set = NULL; 2045 ip_set_id_t i; 2046 2047 inst->is_deleted = true; /* flag for ip_set_nfnl_put */ 2048 2049 for (i = 0; i < inst->ip_set_max; i++) { 2050 set = ip_set(inst, i); 2051 if (set) { 2052 ip_set(inst, i) = NULL; 2053 ip_set_destroy_set(set); 2054 } 2055 } 2056 kfree(rcu_dereference_protected(inst->ip_set_list, 1)); 2057 } 2058 2059 static struct pernet_operations ip_set_net_ops = { 2060 .init = ip_set_net_init, 2061 .exit = ip_set_net_exit, 2062 .id = &ip_set_net_id, 2063 .size = sizeof(struct ip_set_net) 2064 }; 2065 2066 static int __init 2067 ip_set_init(void) 2068 { 2069 int ret = nfnetlink_subsys_register(&ip_set_netlink_subsys); 2070 2071 if (ret != 0) { 2072 pr_err("ip_set: cannot register with nfnetlink.\n"); 2073 return ret; 2074 } 2075 ret = nf_register_sockopt(&so_set); 2076 if (ret != 0) { 2077 pr_err("SO_SET registry failed: %d\n", ret); 2078 nfnetlink_subsys_unregister(&ip_set_netlink_subsys); 2079 return ret; 2080 } 2081 ret = register_pernet_subsys(&ip_set_net_ops); 2082 if (ret) { 2083 pr_err("ip_set: cannot register pernet_subsys.\n"); 2084 nf_unregister_sockopt(&so_set); 2085 nfnetlink_subsys_unregister(&ip_set_netlink_subsys); 2086 return ret; 2087 } 2088 pr_info("ip_set: protocol %u\n", IPSET_PROTOCOL); 2089 return 0; 2090 } 2091 2092 static void __exit 2093 ip_set_fini(void) 2094 { 2095 unregister_pernet_subsys(&ip_set_net_ops); 2096 nf_unregister_sockopt(&so_set); 2097 nfnetlink_subsys_unregister(&ip_set_netlink_subsys); 2098 pr_debug("these are the famous last words\n"); 2099 } 2100 2101 module_init(ip_set_init); 2102 module_exit(ip_set_fini); 2103