1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu> 3 * Patrick Schaaf <bof@bof.de> 4 * Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org> 5 */ 6 7 /* Kernel module for IP set management */ 8 9 #include <linux/init.h> 10 #include <linux/module.h> 11 #include <linux/moduleparam.h> 12 #include <linux/ip.h> 13 #include <linux/skbuff.h> 14 #include <linux/spinlock.h> 15 #include <linux/rculist.h> 16 #include <net/netlink.h> 17 #include <net/net_namespace.h> 18 #include <net/netns/generic.h> 19 20 #include <linux/netfilter.h> 21 #include <linux/netfilter/x_tables.h> 22 #include <linux/netfilter/nfnetlink.h> 23 #include <linux/netfilter/ipset/ip_set.h> 24 25 static LIST_HEAD(ip_set_type_list); /* all registered set types */ 26 static DEFINE_MUTEX(ip_set_type_mutex); /* protects ip_set_type_list */ 27 static DEFINE_RWLOCK(ip_set_ref_lock); /* protects the set refs */ 28 29 struct ip_set_net { 30 struct ip_set * __rcu *ip_set_list; /* all individual sets */ 31 ip_set_id_t ip_set_max; /* max number of sets */ 32 bool is_deleted; /* deleted by ip_set_net_exit */ 33 bool is_destroyed; /* all sets are destroyed */ 34 }; 35 36 static unsigned int ip_set_net_id __read_mostly; 37 38 static struct ip_set_net *ip_set_pernet(struct net *net) 39 { 40 return net_generic(net, ip_set_net_id); 41 } 42 43 #define IP_SET_INC 64 44 #define STRNCMP(a, b) (strncmp(a, b, IPSET_MAXNAMELEN) == 0) 45 46 static unsigned int max_sets; 47 48 module_param(max_sets, int, 0600); 49 MODULE_PARM_DESC(max_sets, "maximal number of sets"); 50 MODULE_LICENSE("GPL"); 51 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>"); 52 MODULE_DESCRIPTION("core IP set support"); 53 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_IPSET); 54 55 /* When the nfnl mutex or ip_set_ref_lock is held: */ 56 #define ip_set_dereference(p) \ 57 rcu_dereference_protected(p, \ 58 lockdep_nfnl_is_held(NFNL_SUBSYS_IPSET) || \ 59 lockdep_is_held(&ip_set_ref_lock)) 60 #define ip_set(inst, id) \ 61 ip_set_dereference((inst)->ip_set_list)[id] 62 #define ip_set_ref_netlink(inst,id) \ 63 rcu_dereference_raw((inst)->ip_set_list)[id] 64 65 /* The set types are implemented in modules and registered set types 66 * can be found in ip_set_type_list. Adding/deleting types is 67 * serialized by ip_set_type_mutex. 68 */ 69 70 static void 71 ip_set_type_lock(void) 72 { 73 mutex_lock(&ip_set_type_mutex); 74 } 75 76 static void 77 ip_set_type_unlock(void) 78 { 79 mutex_unlock(&ip_set_type_mutex); 80 } 81 82 /* Register and deregister settype */ 83 84 static struct ip_set_type * 85 find_set_type(const char *name, u8 family, u8 revision) 86 { 87 struct ip_set_type *type; 88 89 list_for_each_entry_rcu(type, &ip_set_type_list, list, 90 lockdep_is_held(&ip_set_type_mutex)) 91 if (STRNCMP(type->name, name) && 92 (type->family == family || 93 type->family == NFPROTO_UNSPEC) && 94 revision >= type->revision_min && 95 revision <= type->revision_max) 96 return type; 97 return NULL; 98 } 99 100 /* Unlock, try to load a set type module and lock again */ 101 static bool 102 load_settype(const char *name) 103 { 104 nfnl_unlock(NFNL_SUBSYS_IPSET); 105 pr_debug("try to load ip_set_%s\n", name); 106 if (request_module("ip_set_%s", name) < 0) { 107 pr_warn("Can't find ip_set type %s\n", name); 108 nfnl_lock(NFNL_SUBSYS_IPSET); 109 return false; 110 } 111 nfnl_lock(NFNL_SUBSYS_IPSET); 112 return true; 113 } 114 115 /* Find a set type and reference it */ 116 #define find_set_type_get(name, family, revision, found) \ 117 __find_set_type_get(name, family, revision, found, false) 118 119 static int 120 __find_set_type_get(const char *name, u8 family, u8 revision, 121 struct ip_set_type **found, bool retry) 122 { 123 struct ip_set_type *type; 124 int err; 125 126 if (retry && !load_settype(name)) 127 return -IPSET_ERR_FIND_TYPE; 128 129 rcu_read_lock(); 130 *found = find_set_type(name, family, revision); 131 if (*found) { 132 err = !try_module_get((*found)->me) ? -EFAULT : 0; 133 goto unlock; 134 } 135 /* Make sure the type is already loaded 136 * but we don't support the revision 137 */ 138 list_for_each_entry_rcu(type, &ip_set_type_list, list) 139 if (STRNCMP(type->name, name)) { 140 err = -IPSET_ERR_FIND_TYPE; 141 goto unlock; 142 } 143 rcu_read_unlock(); 144 145 return retry ? -IPSET_ERR_FIND_TYPE : 146 __find_set_type_get(name, family, revision, found, true); 147 148 unlock: 149 rcu_read_unlock(); 150 return err; 151 } 152 153 /* Find a given set type by name and family. 154 * If we succeeded, the supported minimal and maximum revisions are 155 * filled out. 156 */ 157 #define find_set_type_minmax(name, family, min, max) \ 158 __find_set_type_minmax(name, family, min, max, false) 159 160 static int 161 __find_set_type_minmax(const char *name, u8 family, u8 *min, u8 *max, 162 bool retry) 163 { 164 struct ip_set_type *type; 165 bool found = false; 166 167 if (retry && !load_settype(name)) 168 return -IPSET_ERR_FIND_TYPE; 169 170 *min = 255; *max = 0; 171 rcu_read_lock(); 172 list_for_each_entry_rcu(type, &ip_set_type_list, list) 173 if (STRNCMP(type->name, name) && 174 (type->family == family || 175 type->family == NFPROTO_UNSPEC)) { 176 found = true; 177 if (type->revision_min < *min) 178 *min = type->revision_min; 179 if (type->revision_max > *max) 180 *max = type->revision_max; 181 } 182 rcu_read_unlock(); 183 if (found) 184 return 0; 185 186 return retry ? -IPSET_ERR_FIND_TYPE : 187 __find_set_type_minmax(name, family, min, max, true); 188 } 189 190 #define family_name(f) ((f) == NFPROTO_IPV4 ? "inet" : \ 191 (f) == NFPROTO_IPV6 ? "inet6" : "any") 192 193 /* Register a set type structure. The type is identified by 194 * the unique triple of name, family and revision. 195 */ 196 int 197 ip_set_type_register(struct ip_set_type *type) 198 { 199 int ret = 0; 200 201 if (type->protocol != IPSET_PROTOCOL) { 202 pr_warn("ip_set type %s, family %s, revision %u:%u uses wrong protocol version %u (want %u)\n", 203 type->name, family_name(type->family), 204 type->revision_min, type->revision_max, 205 type->protocol, IPSET_PROTOCOL); 206 return -EINVAL; 207 } 208 209 ip_set_type_lock(); 210 if (find_set_type(type->name, type->family, type->revision_min)) { 211 /* Duplicate! */ 212 pr_warn("ip_set type %s, family %s with revision min %u already registered!\n", 213 type->name, family_name(type->family), 214 type->revision_min); 215 ip_set_type_unlock(); 216 return -EINVAL; 217 } 218 list_add_rcu(&type->list, &ip_set_type_list); 219 pr_debug("type %s, family %s, revision %u:%u registered.\n", 220 type->name, family_name(type->family), 221 type->revision_min, type->revision_max); 222 ip_set_type_unlock(); 223 224 return ret; 225 } 226 EXPORT_SYMBOL_GPL(ip_set_type_register); 227 228 /* Unregister a set type. There's a small race with ip_set_create */ 229 void 230 ip_set_type_unregister(struct ip_set_type *type) 231 { 232 ip_set_type_lock(); 233 if (!find_set_type(type->name, type->family, type->revision_min)) { 234 pr_warn("ip_set type %s, family %s with revision min %u not registered\n", 235 type->name, family_name(type->family), 236 type->revision_min); 237 ip_set_type_unlock(); 238 return; 239 } 240 list_del_rcu(&type->list); 241 pr_debug("type %s, family %s with revision min %u unregistered.\n", 242 type->name, family_name(type->family), type->revision_min); 243 ip_set_type_unlock(); 244 245 synchronize_rcu(); 246 } 247 EXPORT_SYMBOL_GPL(ip_set_type_unregister); 248 249 /* Utility functions */ 250 void * 251 ip_set_alloc(size_t size) 252 { 253 return kvzalloc(size, GFP_KERNEL_ACCOUNT); 254 } 255 EXPORT_SYMBOL_GPL(ip_set_alloc); 256 257 void 258 ip_set_free(void *members) 259 { 260 pr_debug("%p: free with %s\n", members, 261 is_vmalloc_addr(members) ? "vfree" : "kfree"); 262 kvfree(members); 263 } 264 EXPORT_SYMBOL_GPL(ip_set_free); 265 266 static bool 267 flag_nested(const struct nlattr *nla) 268 { 269 return nla->nla_type & NLA_F_NESTED; 270 } 271 272 static const struct nla_policy ipaddr_policy[IPSET_ATTR_IPADDR_MAX + 1] = { 273 [IPSET_ATTR_IPADDR_IPV4] = { .type = NLA_U32 }, 274 [IPSET_ATTR_IPADDR_IPV6] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)), 275 }; 276 277 int 278 ip_set_get_ipaddr4(struct nlattr *nla, __be32 *ipaddr) 279 { 280 struct nlattr *tb[IPSET_ATTR_IPADDR_MAX + 1]; 281 282 if (unlikely(!flag_nested(nla))) 283 return -IPSET_ERR_PROTOCOL; 284 if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, 285 ipaddr_policy, NULL)) 286 return -IPSET_ERR_PROTOCOL; 287 if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV4))) 288 return -IPSET_ERR_PROTOCOL; 289 290 *ipaddr = nla_get_be32(tb[IPSET_ATTR_IPADDR_IPV4]); 291 return 0; 292 } 293 EXPORT_SYMBOL_GPL(ip_set_get_ipaddr4); 294 295 int 296 ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr) 297 { 298 struct nlattr *tb[IPSET_ATTR_IPADDR_MAX + 1]; 299 300 if (unlikely(!flag_nested(nla))) 301 return -IPSET_ERR_PROTOCOL; 302 303 if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, 304 ipaddr_policy, NULL)) 305 return -IPSET_ERR_PROTOCOL; 306 if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV6))) 307 return -IPSET_ERR_PROTOCOL; 308 309 memcpy(ipaddr, nla_data(tb[IPSET_ATTR_IPADDR_IPV6]), 310 sizeof(struct in6_addr)); 311 return 0; 312 } 313 EXPORT_SYMBOL_GPL(ip_set_get_ipaddr6); 314 315 static u32 316 ip_set_timeout_get(const unsigned long *timeout) 317 { 318 u32 t; 319 320 if (*timeout == IPSET_ELEM_PERMANENT) 321 return 0; 322 323 t = jiffies_to_msecs(*timeout - jiffies) / MSEC_PER_SEC; 324 /* Zero value in userspace means no timeout */ 325 return t == 0 ? 1 : t; 326 } 327 328 static char * 329 ip_set_comment_uget(struct nlattr *tb) 330 { 331 return nla_data(tb); 332 } 333 334 /* Called from uadd only, protected by the set spinlock. 335 * The kadt functions don't use the comment extensions in any way. 336 */ 337 void 338 ip_set_init_comment(struct ip_set *set, struct ip_set_comment *comment, 339 const struct ip_set_ext *ext) 340 { 341 struct ip_set_comment_rcu *c = rcu_dereference_protected(comment->c, 1); 342 size_t len = ext->comment ? strlen(ext->comment) : 0; 343 344 if (unlikely(c)) { 345 set->ext_size -= sizeof(*c) + strlen(c->str) + 1; 346 kfree_rcu(c, rcu); 347 rcu_assign_pointer(comment->c, NULL); 348 } 349 if (!len) 350 return; 351 if (unlikely(len > IPSET_MAX_COMMENT_SIZE)) 352 len = IPSET_MAX_COMMENT_SIZE; 353 c = kmalloc(sizeof(*c) + len + 1, GFP_ATOMIC); 354 if (unlikely(!c)) 355 return; 356 strlcpy(c->str, ext->comment, len + 1); 357 set->ext_size += sizeof(*c) + strlen(c->str) + 1; 358 rcu_assign_pointer(comment->c, c); 359 } 360 EXPORT_SYMBOL_GPL(ip_set_init_comment); 361 362 /* Used only when dumping a set, protected by rcu_read_lock() */ 363 static int 364 ip_set_put_comment(struct sk_buff *skb, const struct ip_set_comment *comment) 365 { 366 struct ip_set_comment_rcu *c = rcu_dereference(comment->c); 367 368 if (!c) 369 return 0; 370 return nla_put_string(skb, IPSET_ATTR_COMMENT, c->str); 371 } 372 373 /* Called from uadd/udel, flush or the garbage collectors protected 374 * by the set spinlock. 375 * Called when the set is destroyed and when there can't be any user 376 * of the set data anymore. 377 */ 378 static void 379 ip_set_comment_free(struct ip_set *set, void *ptr) 380 { 381 struct ip_set_comment *comment = ptr; 382 struct ip_set_comment_rcu *c; 383 384 c = rcu_dereference_protected(comment->c, 1); 385 if (unlikely(!c)) 386 return; 387 set->ext_size -= sizeof(*c) + strlen(c->str) + 1; 388 kfree_rcu(c, rcu); 389 rcu_assign_pointer(comment->c, NULL); 390 } 391 392 typedef void (*destroyer)(struct ip_set *, void *); 393 /* ipset data extension types, in size order */ 394 395 const struct ip_set_ext_type ip_set_extensions[] = { 396 [IPSET_EXT_ID_COUNTER] = { 397 .type = IPSET_EXT_COUNTER, 398 .flag = IPSET_FLAG_WITH_COUNTERS, 399 .len = sizeof(struct ip_set_counter), 400 .align = __alignof__(struct ip_set_counter), 401 }, 402 [IPSET_EXT_ID_TIMEOUT] = { 403 .type = IPSET_EXT_TIMEOUT, 404 .len = sizeof(unsigned long), 405 .align = __alignof__(unsigned long), 406 }, 407 [IPSET_EXT_ID_SKBINFO] = { 408 .type = IPSET_EXT_SKBINFO, 409 .flag = IPSET_FLAG_WITH_SKBINFO, 410 .len = sizeof(struct ip_set_skbinfo), 411 .align = __alignof__(struct ip_set_skbinfo), 412 }, 413 [IPSET_EXT_ID_COMMENT] = { 414 .type = IPSET_EXT_COMMENT | IPSET_EXT_DESTROY, 415 .flag = IPSET_FLAG_WITH_COMMENT, 416 .len = sizeof(struct ip_set_comment), 417 .align = __alignof__(struct ip_set_comment), 418 .destroy = ip_set_comment_free, 419 }, 420 }; 421 EXPORT_SYMBOL_GPL(ip_set_extensions); 422 423 static bool 424 add_extension(enum ip_set_ext_id id, u32 flags, struct nlattr *tb[]) 425 { 426 return ip_set_extensions[id].flag ? 427 (flags & ip_set_extensions[id].flag) : 428 !!tb[IPSET_ATTR_TIMEOUT]; 429 } 430 431 size_t 432 ip_set_elem_len(struct ip_set *set, struct nlattr *tb[], size_t len, 433 size_t align) 434 { 435 enum ip_set_ext_id id; 436 u32 cadt_flags = 0; 437 438 if (tb[IPSET_ATTR_CADT_FLAGS]) 439 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 440 if (cadt_flags & IPSET_FLAG_WITH_FORCEADD) 441 set->flags |= IPSET_CREATE_FLAG_FORCEADD; 442 if (!align) 443 align = 1; 444 for (id = 0; id < IPSET_EXT_ID_MAX; id++) { 445 if (!add_extension(id, cadt_flags, tb)) 446 continue; 447 if (align < ip_set_extensions[id].align) 448 align = ip_set_extensions[id].align; 449 len = ALIGN(len, ip_set_extensions[id].align); 450 set->offset[id] = len; 451 set->extensions |= ip_set_extensions[id].type; 452 len += ip_set_extensions[id].len; 453 } 454 return ALIGN(len, align); 455 } 456 EXPORT_SYMBOL_GPL(ip_set_elem_len); 457 458 int 459 ip_set_get_extensions(struct ip_set *set, struct nlattr *tb[], 460 struct ip_set_ext *ext) 461 { 462 u64 fullmark; 463 464 if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || 465 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || 466 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) || 467 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) || 468 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) || 469 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE))) 470 return -IPSET_ERR_PROTOCOL; 471 472 if (tb[IPSET_ATTR_TIMEOUT]) { 473 if (!SET_WITH_TIMEOUT(set)) 474 return -IPSET_ERR_TIMEOUT; 475 ext->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); 476 } 477 if (tb[IPSET_ATTR_BYTES] || tb[IPSET_ATTR_PACKETS]) { 478 if (!SET_WITH_COUNTER(set)) 479 return -IPSET_ERR_COUNTER; 480 if (tb[IPSET_ATTR_BYTES]) 481 ext->bytes = be64_to_cpu(nla_get_be64( 482 tb[IPSET_ATTR_BYTES])); 483 if (tb[IPSET_ATTR_PACKETS]) 484 ext->packets = be64_to_cpu(nla_get_be64( 485 tb[IPSET_ATTR_PACKETS])); 486 } 487 if (tb[IPSET_ATTR_COMMENT]) { 488 if (!SET_WITH_COMMENT(set)) 489 return -IPSET_ERR_COMMENT; 490 ext->comment = ip_set_comment_uget(tb[IPSET_ATTR_COMMENT]); 491 } 492 if (tb[IPSET_ATTR_SKBMARK]) { 493 if (!SET_WITH_SKBINFO(set)) 494 return -IPSET_ERR_SKBINFO; 495 fullmark = be64_to_cpu(nla_get_be64(tb[IPSET_ATTR_SKBMARK])); 496 ext->skbinfo.skbmark = fullmark >> 32; 497 ext->skbinfo.skbmarkmask = fullmark & 0xffffffff; 498 } 499 if (tb[IPSET_ATTR_SKBPRIO]) { 500 if (!SET_WITH_SKBINFO(set)) 501 return -IPSET_ERR_SKBINFO; 502 ext->skbinfo.skbprio = 503 be32_to_cpu(nla_get_be32(tb[IPSET_ATTR_SKBPRIO])); 504 } 505 if (tb[IPSET_ATTR_SKBQUEUE]) { 506 if (!SET_WITH_SKBINFO(set)) 507 return -IPSET_ERR_SKBINFO; 508 ext->skbinfo.skbqueue = 509 be16_to_cpu(nla_get_be16(tb[IPSET_ATTR_SKBQUEUE])); 510 } 511 return 0; 512 } 513 EXPORT_SYMBOL_GPL(ip_set_get_extensions); 514 515 static u64 516 ip_set_get_bytes(const struct ip_set_counter *counter) 517 { 518 return (u64)atomic64_read(&(counter)->bytes); 519 } 520 521 static u64 522 ip_set_get_packets(const struct ip_set_counter *counter) 523 { 524 return (u64)atomic64_read(&(counter)->packets); 525 } 526 527 static bool 528 ip_set_put_counter(struct sk_buff *skb, const struct ip_set_counter *counter) 529 { 530 return nla_put_net64(skb, IPSET_ATTR_BYTES, 531 cpu_to_be64(ip_set_get_bytes(counter)), 532 IPSET_ATTR_PAD) || 533 nla_put_net64(skb, IPSET_ATTR_PACKETS, 534 cpu_to_be64(ip_set_get_packets(counter)), 535 IPSET_ATTR_PAD); 536 } 537 538 static bool 539 ip_set_put_skbinfo(struct sk_buff *skb, const struct ip_set_skbinfo *skbinfo) 540 { 541 /* Send nonzero parameters only */ 542 return ((skbinfo->skbmark || skbinfo->skbmarkmask) && 543 nla_put_net64(skb, IPSET_ATTR_SKBMARK, 544 cpu_to_be64((u64)skbinfo->skbmark << 32 | 545 skbinfo->skbmarkmask), 546 IPSET_ATTR_PAD)) || 547 (skbinfo->skbprio && 548 nla_put_net32(skb, IPSET_ATTR_SKBPRIO, 549 cpu_to_be32(skbinfo->skbprio))) || 550 (skbinfo->skbqueue && 551 nla_put_net16(skb, IPSET_ATTR_SKBQUEUE, 552 cpu_to_be16(skbinfo->skbqueue))); 553 } 554 555 int 556 ip_set_put_extensions(struct sk_buff *skb, const struct ip_set *set, 557 const void *e, bool active) 558 { 559 if (SET_WITH_TIMEOUT(set)) { 560 unsigned long *timeout = ext_timeout(e, set); 561 562 if (nla_put_net32(skb, IPSET_ATTR_TIMEOUT, 563 htonl(active ? ip_set_timeout_get(timeout) 564 : *timeout))) 565 return -EMSGSIZE; 566 } 567 if (SET_WITH_COUNTER(set) && 568 ip_set_put_counter(skb, ext_counter(e, set))) 569 return -EMSGSIZE; 570 if (SET_WITH_COMMENT(set) && 571 ip_set_put_comment(skb, ext_comment(e, set))) 572 return -EMSGSIZE; 573 if (SET_WITH_SKBINFO(set) && 574 ip_set_put_skbinfo(skb, ext_skbinfo(e, set))) 575 return -EMSGSIZE; 576 return 0; 577 } 578 EXPORT_SYMBOL_GPL(ip_set_put_extensions); 579 580 static bool 581 ip_set_match_counter(u64 counter, u64 match, u8 op) 582 { 583 switch (op) { 584 case IPSET_COUNTER_NONE: 585 return true; 586 case IPSET_COUNTER_EQ: 587 return counter == match; 588 case IPSET_COUNTER_NE: 589 return counter != match; 590 case IPSET_COUNTER_LT: 591 return counter < match; 592 case IPSET_COUNTER_GT: 593 return counter > match; 594 } 595 return false; 596 } 597 598 static void 599 ip_set_add_bytes(u64 bytes, struct ip_set_counter *counter) 600 { 601 atomic64_add((long long)bytes, &(counter)->bytes); 602 } 603 604 static void 605 ip_set_add_packets(u64 packets, struct ip_set_counter *counter) 606 { 607 atomic64_add((long long)packets, &(counter)->packets); 608 } 609 610 static void 611 ip_set_update_counter(struct ip_set_counter *counter, 612 const struct ip_set_ext *ext, u32 flags) 613 { 614 if (ext->packets != ULLONG_MAX && 615 !(flags & IPSET_FLAG_SKIP_COUNTER_UPDATE)) { 616 ip_set_add_bytes(ext->bytes, counter); 617 ip_set_add_packets(ext->packets, counter); 618 } 619 } 620 621 static void 622 ip_set_get_skbinfo(struct ip_set_skbinfo *skbinfo, 623 const struct ip_set_ext *ext, 624 struct ip_set_ext *mext, u32 flags) 625 { 626 mext->skbinfo = *skbinfo; 627 } 628 629 bool 630 ip_set_match_extensions(struct ip_set *set, const struct ip_set_ext *ext, 631 struct ip_set_ext *mext, u32 flags, void *data) 632 { 633 if (SET_WITH_TIMEOUT(set) && 634 ip_set_timeout_expired(ext_timeout(data, set))) 635 return false; 636 if (SET_WITH_COUNTER(set)) { 637 struct ip_set_counter *counter = ext_counter(data, set); 638 639 ip_set_update_counter(counter, ext, flags); 640 641 if (flags & IPSET_FLAG_MATCH_COUNTERS && 642 !(ip_set_match_counter(ip_set_get_packets(counter), 643 mext->packets, mext->packets_op) && 644 ip_set_match_counter(ip_set_get_bytes(counter), 645 mext->bytes, mext->bytes_op))) 646 return false; 647 } 648 if (SET_WITH_SKBINFO(set)) 649 ip_set_get_skbinfo(ext_skbinfo(data, set), 650 ext, mext, flags); 651 return true; 652 } 653 EXPORT_SYMBOL_GPL(ip_set_match_extensions); 654 655 /* Creating/destroying/renaming/swapping affect the existence and 656 * the properties of a set. All of these can be executed from userspace 657 * only and serialized by the nfnl mutex indirectly from nfnetlink. 658 * 659 * Sets are identified by their index in ip_set_list and the index 660 * is used by the external references (set/SET netfilter modules). 661 * 662 * The set behind an index may change by swapping only, from userspace. 663 */ 664 665 static void 666 __ip_set_get(struct ip_set *set) 667 { 668 write_lock_bh(&ip_set_ref_lock); 669 set->ref++; 670 write_unlock_bh(&ip_set_ref_lock); 671 } 672 673 static void 674 __ip_set_put(struct ip_set *set) 675 { 676 write_lock_bh(&ip_set_ref_lock); 677 BUG_ON(set->ref == 0); 678 set->ref--; 679 write_unlock_bh(&ip_set_ref_lock); 680 } 681 682 /* set->ref can be swapped out by ip_set_swap, netlink events (like dump) need 683 * a separate reference counter 684 */ 685 static void 686 __ip_set_put_netlink(struct ip_set *set) 687 { 688 write_lock_bh(&ip_set_ref_lock); 689 BUG_ON(set->ref_netlink == 0); 690 set->ref_netlink--; 691 write_unlock_bh(&ip_set_ref_lock); 692 } 693 694 /* Add, del and test set entries from kernel. 695 * 696 * The set behind the index must exist and must be referenced 697 * so it can't be destroyed (or changed) under our foot. 698 */ 699 700 static struct ip_set * 701 ip_set_rcu_get(struct net *net, ip_set_id_t index) 702 { 703 struct ip_set *set; 704 struct ip_set_net *inst = ip_set_pernet(net); 705 706 rcu_read_lock(); 707 /* ip_set_list itself needs to be protected */ 708 set = rcu_dereference(inst->ip_set_list)[index]; 709 rcu_read_unlock(); 710 711 return set; 712 } 713 714 static inline void 715 ip_set_lock(struct ip_set *set) 716 { 717 if (!set->variant->region_lock) 718 spin_lock_bh(&set->lock); 719 } 720 721 static inline void 722 ip_set_unlock(struct ip_set *set) 723 { 724 if (!set->variant->region_lock) 725 spin_unlock_bh(&set->lock); 726 } 727 728 int 729 ip_set_test(ip_set_id_t index, const struct sk_buff *skb, 730 const struct xt_action_param *par, struct ip_set_adt_opt *opt) 731 { 732 struct ip_set *set = ip_set_rcu_get(xt_net(par), index); 733 int ret = 0; 734 735 BUG_ON(!set); 736 pr_debug("set %s, index %u\n", set->name, index); 737 738 if (opt->dim < set->type->dimension || 739 !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) 740 return 0; 741 742 rcu_read_lock_bh(); 743 ret = set->variant->kadt(set, skb, par, IPSET_TEST, opt); 744 rcu_read_unlock_bh(); 745 746 if (ret == -EAGAIN) { 747 /* Type requests element to be completed */ 748 pr_debug("element must be completed, ADD is triggered\n"); 749 ip_set_lock(set); 750 set->variant->kadt(set, skb, par, IPSET_ADD, opt); 751 ip_set_unlock(set); 752 ret = 1; 753 } else { 754 /* --return-nomatch: invert matched element */ 755 if ((opt->cmdflags & IPSET_FLAG_RETURN_NOMATCH) && 756 (set->type->features & IPSET_TYPE_NOMATCH) && 757 (ret > 0 || ret == -ENOTEMPTY)) 758 ret = -ret; 759 } 760 761 /* Convert error codes to nomatch */ 762 return (ret < 0 ? 0 : ret); 763 } 764 EXPORT_SYMBOL_GPL(ip_set_test); 765 766 int 767 ip_set_add(ip_set_id_t index, const struct sk_buff *skb, 768 const struct xt_action_param *par, struct ip_set_adt_opt *opt) 769 { 770 struct ip_set *set = ip_set_rcu_get(xt_net(par), index); 771 int ret; 772 773 BUG_ON(!set); 774 pr_debug("set %s, index %u\n", set->name, index); 775 776 if (opt->dim < set->type->dimension || 777 !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) 778 return -IPSET_ERR_TYPE_MISMATCH; 779 780 ip_set_lock(set); 781 ret = set->variant->kadt(set, skb, par, IPSET_ADD, opt); 782 ip_set_unlock(set); 783 784 return ret; 785 } 786 EXPORT_SYMBOL_GPL(ip_set_add); 787 788 int 789 ip_set_del(ip_set_id_t index, const struct sk_buff *skb, 790 const struct xt_action_param *par, struct ip_set_adt_opt *opt) 791 { 792 struct ip_set *set = ip_set_rcu_get(xt_net(par), index); 793 int ret = 0; 794 795 BUG_ON(!set); 796 pr_debug("set %s, index %u\n", set->name, index); 797 798 if (opt->dim < set->type->dimension || 799 !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) 800 return -IPSET_ERR_TYPE_MISMATCH; 801 802 ip_set_lock(set); 803 ret = set->variant->kadt(set, skb, par, IPSET_DEL, opt); 804 ip_set_unlock(set); 805 806 return ret; 807 } 808 EXPORT_SYMBOL_GPL(ip_set_del); 809 810 /* Find set by name, reference it once. The reference makes sure the 811 * thing pointed to, does not go away under our feet. 812 * 813 */ 814 ip_set_id_t 815 ip_set_get_byname(struct net *net, const char *name, struct ip_set **set) 816 { 817 ip_set_id_t i, index = IPSET_INVALID_ID; 818 struct ip_set *s; 819 struct ip_set_net *inst = ip_set_pernet(net); 820 821 rcu_read_lock(); 822 for (i = 0; i < inst->ip_set_max; i++) { 823 s = rcu_dereference(inst->ip_set_list)[i]; 824 if (s && STRNCMP(s->name, name)) { 825 __ip_set_get(s); 826 index = i; 827 *set = s; 828 break; 829 } 830 } 831 rcu_read_unlock(); 832 833 return index; 834 } 835 EXPORT_SYMBOL_GPL(ip_set_get_byname); 836 837 /* If the given set pointer points to a valid set, decrement 838 * reference count by 1. The caller shall not assume the index 839 * to be valid, after calling this function. 840 * 841 */ 842 843 static void 844 __ip_set_put_byindex(struct ip_set_net *inst, ip_set_id_t index) 845 { 846 struct ip_set *set; 847 848 rcu_read_lock(); 849 set = rcu_dereference(inst->ip_set_list)[index]; 850 if (set) 851 __ip_set_put(set); 852 rcu_read_unlock(); 853 } 854 855 void 856 ip_set_put_byindex(struct net *net, ip_set_id_t index) 857 { 858 struct ip_set_net *inst = ip_set_pernet(net); 859 860 __ip_set_put_byindex(inst, index); 861 } 862 EXPORT_SYMBOL_GPL(ip_set_put_byindex); 863 864 /* Get the name of a set behind a set index. 865 * Set itself is protected by RCU, but its name isn't: to protect against 866 * renaming, grab ip_set_ref_lock as reader (see ip_set_rename()) and copy the 867 * name. 868 */ 869 void 870 ip_set_name_byindex(struct net *net, ip_set_id_t index, char *name) 871 { 872 struct ip_set *set = ip_set_rcu_get(net, index); 873 874 BUG_ON(!set); 875 876 read_lock_bh(&ip_set_ref_lock); 877 strncpy(name, set->name, IPSET_MAXNAMELEN); 878 read_unlock_bh(&ip_set_ref_lock); 879 } 880 EXPORT_SYMBOL_GPL(ip_set_name_byindex); 881 882 /* Routines to call by external subsystems, which do not 883 * call nfnl_lock for us. 884 */ 885 886 /* Find set by index, reference it once. The reference makes sure the 887 * thing pointed to, does not go away under our feet. 888 * 889 * The nfnl mutex is used in the function. 890 */ 891 ip_set_id_t 892 ip_set_nfnl_get_byindex(struct net *net, ip_set_id_t index) 893 { 894 struct ip_set *set; 895 struct ip_set_net *inst = ip_set_pernet(net); 896 897 if (index >= inst->ip_set_max) 898 return IPSET_INVALID_ID; 899 900 nfnl_lock(NFNL_SUBSYS_IPSET); 901 set = ip_set(inst, index); 902 if (set) 903 __ip_set_get(set); 904 else 905 index = IPSET_INVALID_ID; 906 nfnl_unlock(NFNL_SUBSYS_IPSET); 907 908 return index; 909 } 910 EXPORT_SYMBOL_GPL(ip_set_nfnl_get_byindex); 911 912 /* If the given set pointer points to a valid set, decrement 913 * reference count by 1. The caller shall not assume the index 914 * to be valid, after calling this function. 915 * 916 * The nfnl mutex is used in the function. 917 */ 918 void 919 ip_set_nfnl_put(struct net *net, ip_set_id_t index) 920 { 921 struct ip_set *set; 922 struct ip_set_net *inst = ip_set_pernet(net); 923 924 nfnl_lock(NFNL_SUBSYS_IPSET); 925 if (!inst->is_deleted) { /* already deleted from ip_set_net_exit() */ 926 set = ip_set(inst, index); 927 if (set) 928 __ip_set_put(set); 929 } 930 nfnl_unlock(NFNL_SUBSYS_IPSET); 931 } 932 EXPORT_SYMBOL_GPL(ip_set_nfnl_put); 933 934 /* Communication protocol with userspace over netlink. 935 * 936 * The commands are serialized by the nfnl mutex. 937 */ 938 939 static inline u8 protocol(const struct nlattr * const tb[]) 940 { 941 return nla_get_u8(tb[IPSET_ATTR_PROTOCOL]); 942 } 943 944 static inline bool 945 protocol_failed(const struct nlattr * const tb[]) 946 { 947 return !tb[IPSET_ATTR_PROTOCOL] || protocol(tb) != IPSET_PROTOCOL; 948 } 949 950 static inline bool 951 protocol_min_failed(const struct nlattr * const tb[]) 952 { 953 return !tb[IPSET_ATTR_PROTOCOL] || protocol(tb) < IPSET_PROTOCOL_MIN; 954 } 955 956 static inline u32 957 flag_exist(const struct nlmsghdr *nlh) 958 { 959 return nlh->nlmsg_flags & NLM_F_EXCL ? 0 : IPSET_FLAG_EXIST; 960 } 961 962 static struct nlmsghdr * 963 start_msg(struct sk_buff *skb, u32 portid, u32 seq, unsigned int flags, 964 enum ipset_cmd cmd) 965 { 966 struct nlmsghdr *nlh; 967 struct nfgenmsg *nfmsg; 968 969 nlh = nlmsg_put(skb, portid, seq, nfnl_msg_type(NFNL_SUBSYS_IPSET, cmd), 970 sizeof(*nfmsg), flags); 971 if (!nlh) 972 return NULL; 973 974 nfmsg = nlmsg_data(nlh); 975 nfmsg->nfgen_family = NFPROTO_IPV4; 976 nfmsg->version = NFNETLINK_V0; 977 nfmsg->res_id = 0; 978 979 return nlh; 980 } 981 982 /* Create a set */ 983 984 static const struct nla_policy ip_set_create_policy[IPSET_ATTR_CMD_MAX + 1] = { 985 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 986 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 987 .len = IPSET_MAXNAMELEN - 1 }, 988 [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, 989 .len = IPSET_MAXNAMELEN - 1}, 990 [IPSET_ATTR_REVISION] = { .type = NLA_U8 }, 991 [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, 992 [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, 993 }; 994 995 static struct ip_set * 996 find_set_and_id(struct ip_set_net *inst, const char *name, ip_set_id_t *id) 997 { 998 struct ip_set *set = NULL; 999 ip_set_id_t i; 1000 1001 *id = IPSET_INVALID_ID; 1002 for (i = 0; i < inst->ip_set_max; i++) { 1003 set = ip_set(inst, i); 1004 if (set && STRNCMP(set->name, name)) { 1005 *id = i; 1006 break; 1007 } 1008 } 1009 return (*id == IPSET_INVALID_ID ? NULL : set); 1010 } 1011 1012 static inline struct ip_set * 1013 find_set(struct ip_set_net *inst, const char *name) 1014 { 1015 ip_set_id_t id; 1016 1017 return find_set_and_id(inst, name, &id); 1018 } 1019 1020 static int 1021 find_free_id(struct ip_set_net *inst, const char *name, ip_set_id_t *index, 1022 struct ip_set **set) 1023 { 1024 struct ip_set *s; 1025 ip_set_id_t i; 1026 1027 *index = IPSET_INVALID_ID; 1028 for (i = 0; i < inst->ip_set_max; i++) { 1029 s = ip_set(inst, i); 1030 if (!s) { 1031 if (*index == IPSET_INVALID_ID) 1032 *index = i; 1033 } else if (STRNCMP(name, s->name)) { 1034 /* Name clash */ 1035 *set = s; 1036 return -EEXIST; 1037 } 1038 } 1039 if (*index == IPSET_INVALID_ID) 1040 /* No free slot remained */ 1041 return -IPSET_ERR_MAX_SETS; 1042 return 0; 1043 } 1044 1045 static int ip_set_none(struct net *net, struct sock *ctnl, struct sk_buff *skb, 1046 const struct nlmsghdr *nlh, 1047 const struct nlattr * const attr[], 1048 struct netlink_ext_ack *extack) 1049 { 1050 return -EOPNOTSUPP; 1051 } 1052 1053 static int ip_set_create(struct net *net, struct sock *ctnl, 1054 struct sk_buff *skb, const struct nlmsghdr *nlh, 1055 const struct nlattr * const attr[], 1056 struct netlink_ext_ack *extack) 1057 { 1058 struct ip_set_net *inst = ip_set_pernet(net); 1059 struct ip_set *set, *clash = NULL; 1060 ip_set_id_t index = IPSET_INVALID_ID; 1061 struct nlattr *tb[IPSET_ATTR_CREATE_MAX + 1] = {}; 1062 const char *name, *typename; 1063 u8 family, revision; 1064 u32 flags = flag_exist(nlh); 1065 int ret = 0; 1066 1067 if (unlikely(protocol_min_failed(attr) || 1068 !attr[IPSET_ATTR_SETNAME] || 1069 !attr[IPSET_ATTR_TYPENAME] || 1070 !attr[IPSET_ATTR_REVISION] || 1071 !attr[IPSET_ATTR_FAMILY] || 1072 (attr[IPSET_ATTR_DATA] && 1073 !flag_nested(attr[IPSET_ATTR_DATA])))) 1074 return -IPSET_ERR_PROTOCOL; 1075 1076 name = nla_data(attr[IPSET_ATTR_SETNAME]); 1077 typename = nla_data(attr[IPSET_ATTR_TYPENAME]); 1078 family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); 1079 revision = nla_get_u8(attr[IPSET_ATTR_REVISION]); 1080 pr_debug("setname: %s, typename: %s, family: %s, revision: %u\n", 1081 name, typename, family_name(family), revision); 1082 1083 /* First, and without any locks, allocate and initialize 1084 * a normal base set structure. 1085 */ 1086 set = kzalloc(sizeof(*set), GFP_KERNEL); 1087 if (!set) 1088 return -ENOMEM; 1089 spin_lock_init(&set->lock); 1090 strlcpy(set->name, name, IPSET_MAXNAMELEN); 1091 set->family = family; 1092 set->revision = revision; 1093 1094 /* Next, check that we know the type, and take 1095 * a reference on the type, to make sure it stays available 1096 * while constructing our new set. 1097 * 1098 * After referencing the type, we try to create the type 1099 * specific part of the set without holding any locks. 1100 */ 1101 ret = find_set_type_get(typename, family, revision, &set->type); 1102 if (ret) 1103 goto out; 1104 1105 /* Without holding any locks, create private part. */ 1106 if (attr[IPSET_ATTR_DATA] && 1107 nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA], 1108 set->type->create_policy, NULL)) { 1109 ret = -IPSET_ERR_PROTOCOL; 1110 goto put_out; 1111 } 1112 /* Set create flags depending on the type revision */ 1113 set->flags |= set->type->create_flags[revision]; 1114 1115 ret = set->type->create(net, set, tb, flags); 1116 if (ret != 0) 1117 goto put_out; 1118 1119 /* BTW, ret==0 here. */ 1120 1121 /* Here, we have a valid, constructed set and we are protected 1122 * by the nfnl mutex. Find the first free index in ip_set_list 1123 * and check clashing. 1124 */ 1125 ret = find_free_id(inst, set->name, &index, &clash); 1126 if (ret == -EEXIST) { 1127 /* If this is the same set and requested, ignore error */ 1128 if ((flags & IPSET_FLAG_EXIST) && 1129 STRNCMP(set->type->name, clash->type->name) && 1130 set->type->family == clash->type->family && 1131 set->type->revision_min == clash->type->revision_min && 1132 set->type->revision_max == clash->type->revision_max && 1133 set->variant->same_set(set, clash)) 1134 ret = 0; 1135 goto cleanup; 1136 } else if (ret == -IPSET_ERR_MAX_SETS) { 1137 struct ip_set **list, **tmp; 1138 ip_set_id_t i = inst->ip_set_max + IP_SET_INC; 1139 1140 if (i < inst->ip_set_max || i == IPSET_INVALID_ID) 1141 /* Wraparound */ 1142 goto cleanup; 1143 1144 list = kvcalloc(i, sizeof(struct ip_set *), GFP_KERNEL); 1145 if (!list) 1146 goto cleanup; 1147 /* nfnl mutex is held, both lists are valid */ 1148 tmp = ip_set_dereference(inst->ip_set_list); 1149 memcpy(list, tmp, sizeof(struct ip_set *) * inst->ip_set_max); 1150 rcu_assign_pointer(inst->ip_set_list, list); 1151 /* Make sure all current packets have passed through */ 1152 synchronize_net(); 1153 /* Use new list */ 1154 index = inst->ip_set_max; 1155 inst->ip_set_max = i; 1156 kvfree(tmp); 1157 ret = 0; 1158 } else if (ret) { 1159 goto cleanup; 1160 } 1161 1162 /* Finally! Add our shiny new set to the list, and be done. */ 1163 pr_debug("create: '%s' created with index %u!\n", set->name, index); 1164 ip_set(inst, index) = set; 1165 1166 return ret; 1167 1168 cleanup: 1169 set->variant->destroy(set); 1170 put_out: 1171 module_put(set->type->me); 1172 out: 1173 kfree(set); 1174 return ret; 1175 } 1176 1177 /* Destroy sets */ 1178 1179 static const struct nla_policy 1180 ip_set_setname_policy[IPSET_ATTR_CMD_MAX + 1] = { 1181 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1182 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 1183 .len = IPSET_MAXNAMELEN - 1 }, 1184 }; 1185 1186 static void 1187 ip_set_destroy_set(struct ip_set *set) 1188 { 1189 pr_debug("set: %s\n", set->name); 1190 1191 /* Must call it without holding any lock */ 1192 set->variant->destroy(set); 1193 module_put(set->type->me); 1194 kfree(set); 1195 } 1196 1197 static int ip_set_destroy(struct net *net, struct sock *ctnl, 1198 struct sk_buff *skb, const struct nlmsghdr *nlh, 1199 const struct nlattr * const attr[], 1200 struct netlink_ext_ack *extack) 1201 { 1202 struct ip_set_net *inst = ip_set_pernet(net); 1203 struct ip_set *s; 1204 ip_set_id_t i; 1205 int ret = 0; 1206 1207 if (unlikely(protocol_min_failed(attr))) 1208 return -IPSET_ERR_PROTOCOL; 1209 1210 /* Must wait for flush to be really finished in list:set */ 1211 rcu_barrier(); 1212 1213 /* Commands are serialized and references are 1214 * protected by the ip_set_ref_lock. 1215 * External systems (i.e. xt_set) must call 1216 * ip_set_put|get_nfnl_* functions, that way we 1217 * can safely check references here. 1218 * 1219 * list:set timer can only decrement the reference 1220 * counter, so if it's already zero, we can proceed 1221 * without holding the lock. 1222 */ 1223 read_lock_bh(&ip_set_ref_lock); 1224 if (!attr[IPSET_ATTR_SETNAME]) { 1225 for (i = 0; i < inst->ip_set_max; i++) { 1226 s = ip_set(inst, i); 1227 if (s && (s->ref || s->ref_netlink)) { 1228 ret = -IPSET_ERR_BUSY; 1229 goto out; 1230 } 1231 } 1232 inst->is_destroyed = true; 1233 read_unlock_bh(&ip_set_ref_lock); 1234 for (i = 0; i < inst->ip_set_max; i++) { 1235 s = ip_set(inst, i); 1236 if (s) { 1237 ip_set(inst, i) = NULL; 1238 ip_set_destroy_set(s); 1239 } 1240 } 1241 /* Modified by ip_set_destroy() only, which is serialized */ 1242 inst->is_destroyed = false; 1243 } else { 1244 u32 flags = flag_exist(nlh); 1245 s = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), 1246 &i); 1247 if (!s) { 1248 if (!(flags & IPSET_FLAG_EXIST)) 1249 ret = -ENOENT; 1250 goto out; 1251 } else if (s->ref || s->ref_netlink) { 1252 ret = -IPSET_ERR_BUSY; 1253 goto out; 1254 } 1255 ip_set(inst, i) = NULL; 1256 read_unlock_bh(&ip_set_ref_lock); 1257 1258 ip_set_destroy_set(s); 1259 } 1260 return 0; 1261 out: 1262 read_unlock_bh(&ip_set_ref_lock); 1263 return ret; 1264 } 1265 1266 /* Flush sets */ 1267 1268 static void 1269 ip_set_flush_set(struct ip_set *set) 1270 { 1271 pr_debug("set: %s\n", set->name); 1272 1273 ip_set_lock(set); 1274 set->variant->flush(set); 1275 ip_set_unlock(set); 1276 } 1277 1278 static int ip_set_flush(struct net *net, struct sock *ctnl, struct sk_buff *skb, 1279 const struct nlmsghdr *nlh, 1280 const struct nlattr * const attr[], 1281 struct netlink_ext_ack *extack) 1282 { 1283 struct ip_set_net *inst = ip_set_pernet(net); 1284 struct ip_set *s; 1285 ip_set_id_t i; 1286 1287 if (unlikely(protocol_min_failed(attr))) 1288 return -IPSET_ERR_PROTOCOL; 1289 1290 if (!attr[IPSET_ATTR_SETNAME]) { 1291 for (i = 0; i < inst->ip_set_max; i++) { 1292 s = ip_set(inst, i); 1293 if (s) 1294 ip_set_flush_set(s); 1295 } 1296 } else { 1297 s = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1298 if (!s) 1299 return -ENOENT; 1300 1301 ip_set_flush_set(s); 1302 } 1303 1304 return 0; 1305 } 1306 1307 /* Rename a set */ 1308 1309 static const struct nla_policy 1310 ip_set_setname2_policy[IPSET_ATTR_CMD_MAX + 1] = { 1311 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1312 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 1313 .len = IPSET_MAXNAMELEN - 1 }, 1314 [IPSET_ATTR_SETNAME2] = { .type = NLA_NUL_STRING, 1315 .len = IPSET_MAXNAMELEN - 1 }, 1316 }; 1317 1318 static int ip_set_rename(struct net *net, struct sock *ctnl, 1319 struct sk_buff *skb, const struct nlmsghdr *nlh, 1320 const struct nlattr * const attr[], 1321 struct netlink_ext_ack *extack) 1322 { 1323 struct ip_set_net *inst = ip_set_pernet(net); 1324 struct ip_set *set, *s; 1325 const char *name2; 1326 ip_set_id_t i; 1327 int ret = 0; 1328 1329 if (unlikely(protocol_min_failed(attr) || 1330 !attr[IPSET_ATTR_SETNAME] || 1331 !attr[IPSET_ATTR_SETNAME2])) 1332 return -IPSET_ERR_PROTOCOL; 1333 1334 set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1335 if (!set) 1336 return -ENOENT; 1337 1338 write_lock_bh(&ip_set_ref_lock); 1339 if (set->ref != 0 || set->ref_netlink != 0) { 1340 ret = -IPSET_ERR_REFERENCED; 1341 goto out; 1342 } 1343 1344 name2 = nla_data(attr[IPSET_ATTR_SETNAME2]); 1345 for (i = 0; i < inst->ip_set_max; i++) { 1346 s = ip_set(inst, i); 1347 if (s && STRNCMP(s->name, name2)) { 1348 ret = -IPSET_ERR_EXIST_SETNAME2; 1349 goto out; 1350 } 1351 } 1352 strncpy(set->name, name2, IPSET_MAXNAMELEN); 1353 1354 out: 1355 write_unlock_bh(&ip_set_ref_lock); 1356 return ret; 1357 } 1358 1359 /* Swap two sets so that name/index points to the other. 1360 * References and set names are also swapped. 1361 * 1362 * The commands are serialized by the nfnl mutex and references are 1363 * protected by the ip_set_ref_lock. The kernel interfaces 1364 * do not hold the mutex but the pointer settings are atomic 1365 * so the ip_set_list always contains valid pointers to the sets. 1366 */ 1367 1368 static int ip_set_swap(struct net *net, struct sock *ctnl, struct sk_buff *skb, 1369 const struct nlmsghdr *nlh, 1370 const struct nlattr * const attr[], 1371 struct netlink_ext_ack *extack) 1372 { 1373 struct ip_set_net *inst = ip_set_pernet(net); 1374 struct ip_set *from, *to; 1375 ip_set_id_t from_id, to_id; 1376 char from_name[IPSET_MAXNAMELEN]; 1377 1378 if (unlikely(protocol_min_failed(attr) || 1379 !attr[IPSET_ATTR_SETNAME] || 1380 !attr[IPSET_ATTR_SETNAME2])) 1381 return -IPSET_ERR_PROTOCOL; 1382 1383 from = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), 1384 &from_id); 1385 if (!from) 1386 return -ENOENT; 1387 1388 to = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME2]), 1389 &to_id); 1390 if (!to) 1391 return -IPSET_ERR_EXIST_SETNAME2; 1392 1393 /* Features must not change. 1394 * Not an artifical restriction anymore, as we must prevent 1395 * possible loops created by swapping in setlist type of sets. 1396 */ 1397 if (!(from->type->features == to->type->features && 1398 from->family == to->family)) 1399 return -IPSET_ERR_TYPE_MISMATCH; 1400 1401 write_lock_bh(&ip_set_ref_lock); 1402 1403 if (from->ref_netlink || to->ref_netlink) { 1404 write_unlock_bh(&ip_set_ref_lock); 1405 return -EBUSY; 1406 } 1407 1408 strncpy(from_name, from->name, IPSET_MAXNAMELEN); 1409 strncpy(from->name, to->name, IPSET_MAXNAMELEN); 1410 strncpy(to->name, from_name, IPSET_MAXNAMELEN); 1411 1412 swap(from->ref, to->ref); 1413 ip_set(inst, from_id) = to; 1414 ip_set(inst, to_id) = from; 1415 write_unlock_bh(&ip_set_ref_lock); 1416 1417 return 0; 1418 } 1419 1420 /* List/save set data */ 1421 1422 #define DUMP_INIT 0 1423 #define DUMP_ALL 1 1424 #define DUMP_ONE 2 1425 #define DUMP_LAST 3 1426 1427 #define DUMP_TYPE(arg) (((u32)(arg)) & 0x0000FFFF) 1428 #define DUMP_FLAGS(arg) (((u32)(arg)) >> 16) 1429 1430 int 1431 ip_set_put_flags(struct sk_buff *skb, struct ip_set *set) 1432 { 1433 u32 cadt_flags = 0; 1434 1435 if (SET_WITH_TIMEOUT(set)) 1436 if (unlikely(nla_put_net32(skb, IPSET_ATTR_TIMEOUT, 1437 htonl(set->timeout)))) 1438 return -EMSGSIZE; 1439 if (SET_WITH_COUNTER(set)) 1440 cadt_flags |= IPSET_FLAG_WITH_COUNTERS; 1441 if (SET_WITH_COMMENT(set)) 1442 cadt_flags |= IPSET_FLAG_WITH_COMMENT; 1443 if (SET_WITH_SKBINFO(set)) 1444 cadt_flags |= IPSET_FLAG_WITH_SKBINFO; 1445 if (SET_WITH_FORCEADD(set)) 1446 cadt_flags |= IPSET_FLAG_WITH_FORCEADD; 1447 1448 if (!cadt_flags) 1449 return 0; 1450 return nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(cadt_flags)); 1451 } 1452 EXPORT_SYMBOL_GPL(ip_set_put_flags); 1453 1454 static int 1455 ip_set_dump_done(struct netlink_callback *cb) 1456 { 1457 if (cb->args[IPSET_CB_ARG0]) { 1458 struct ip_set_net *inst = 1459 (struct ip_set_net *)cb->args[IPSET_CB_NET]; 1460 ip_set_id_t index = (ip_set_id_t)cb->args[IPSET_CB_INDEX]; 1461 struct ip_set *set = ip_set_ref_netlink(inst, index); 1462 1463 if (set->variant->uref) 1464 set->variant->uref(set, cb, false); 1465 pr_debug("release set %s\n", set->name); 1466 __ip_set_put_netlink(set); 1467 } 1468 return 0; 1469 } 1470 1471 static inline void 1472 dump_attrs(struct nlmsghdr *nlh) 1473 { 1474 const struct nlattr *attr; 1475 int rem; 1476 1477 pr_debug("dump nlmsg\n"); 1478 nlmsg_for_each_attr(attr, nlh, sizeof(struct nfgenmsg), rem) { 1479 pr_debug("type: %u, len %u\n", nla_type(attr), attr->nla_len); 1480 } 1481 } 1482 1483 static const struct nla_policy 1484 ip_set_dump_policy[IPSET_ATTR_CMD_MAX + 1] = { 1485 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1486 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 1487 .len = IPSET_MAXNAMELEN - 1 }, 1488 [IPSET_ATTR_FLAGS] = { .type = NLA_U32 }, 1489 }; 1490 1491 static int 1492 ip_set_dump_start(struct netlink_callback *cb) 1493 { 1494 struct nlmsghdr *nlh = nlmsg_hdr(cb->skb); 1495 int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); 1496 struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1]; 1497 struct nlattr *attr = (void *)nlh + min_len; 1498 struct sk_buff *skb = cb->skb; 1499 struct ip_set_net *inst = ip_set_pernet(sock_net(skb->sk)); 1500 u32 dump_type; 1501 int ret; 1502 1503 ret = nla_parse(cda, IPSET_ATTR_CMD_MAX, attr, 1504 nlh->nlmsg_len - min_len, 1505 ip_set_dump_policy, NULL); 1506 if (ret) 1507 goto error; 1508 1509 cb->args[IPSET_CB_PROTO] = nla_get_u8(cda[IPSET_ATTR_PROTOCOL]); 1510 if (cda[IPSET_ATTR_SETNAME]) { 1511 ip_set_id_t index; 1512 struct ip_set *set; 1513 1514 set = find_set_and_id(inst, nla_data(cda[IPSET_ATTR_SETNAME]), 1515 &index); 1516 if (!set) { 1517 ret = -ENOENT; 1518 goto error; 1519 } 1520 dump_type = DUMP_ONE; 1521 cb->args[IPSET_CB_INDEX] = index; 1522 } else { 1523 dump_type = DUMP_ALL; 1524 } 1525 1526 if (cda[IPSET_ATTR_FLAGS]) { 1527 u32 f = ip_set_get_h32(cda[IPSET_ATTR_FLAGS]); 1528 1529 dump_type |= (f << 16); 1530 } 1531 cb->args[IPSET_CB_NET] = (unsigned long)inst; 1532 cb->args[IPSET_CB_DUMP] = dump_type; 1533 1534 return 0; 1535 1536 error: 1537 /* We have to create and send the error message manually :-( */ 1538 if (nlh->nlmsg_flags & NLM_F_ACK) { 1539 netlink_ack(cb->skb, nlh, ret, NULL); 1540 } 1541 return ret; 1542 } 1543 1544 static int 1545 ip_set_dump_do(struct sk_buff *skb, struct netlink_callback *cb) 1546 { 1547 ip_set_id_t index = IPSET_INVALID_ID, max; 1548 struct ip_set *set = NULL; 1549 struct nlmsghdr *nlh = NULL; 1550 unsigned int flags = NETLINK_CB(cb->skb).portid ? NLM_F_MULTI : 0; 1551 struct ip_set_net *inst = ip_set_pernet(sock_net(skb->sk)); 1552 u32 dump_type, dump_flags; 1553 bool is_destroyed; 1554 int ret = 0; 1555 1556 if (!cb->args[IPSET_CB_DUMP]) 1557 return -EINVAL; 1558 1559 if (cb->args[IPSET_CB_INDEX] >= inst->ip_set_max) 1560 goto out; 1561 1562 dump_type = DUMP_TYPE(cb->args[IPSET_CB_DUMP]); 1563 dump_flags = DUMP_FLAGS(cb->args[IPSET_CB_DUMP]); 1564 max = dump_type == DUMP_ONE ? cb->args[IPSET_CB_INDEX] + 1 1565 : inst->ip_set_max; 1566 dump_last: 1567 pr_debug("dump type, flag: %u %u index: %ld\n", 1568 dump_type, dump_flags, cb->args[IPSET_CB_INDEX]); 1569 for (; cb->args[IPSET_CB_INDEX] < max; cb->args[IPSET_CB_INDEX]++) { 1570 index = (ip_set_id_t)cb->args[IPSET_CB_INDEX]; 1571 write_lock_bh(&ip_set_ref_lock); 1572 set = ip_set(inst, index); 1573 is_destroyed = inst->is_destroyed; 1574 if (!set || is_destroyed) { 1575 write_unlock_bh(&ip_set_ref_lock); 1576 if (dump_type == DUMP_ONE) { 1577 ret = -ENOENT; 1578 goto out; 1579 } 1580 if (is_destroyed) { 1581 /* All sets are just being destroyed */ 1582 ret = 0; 1583 goto out; 1584 } 1585 continue; 1586 } 1587 /* When dumping all sets, we must dump "sorted" 1588 * so that lists (unions of sets) are dumped last. 1589 */ 1590 if (dump_type != DUMP_ONE && 1591 ((dump_type == DUMP_ALL) == 1592 !!(set->type->features & IPSET_DUMP_LAST))) { 1593 write_unlock_bh(&ip_set_ref_lock); 1594 continue; 1595 } 1596 pr_debug("List set: %s\n", set->name); 1597 if (!cb->args[IPSET_CB_ARG0]) { 1598 /* Start listing: make sure set won't be destroyed */ 1599 pr_debug("reference set\n"); 1600 set->ref_netlink++; 1601 } 1602 write_unlock_bh(&ip_set_ref_lock); 1603 nlh = start_msg(skb, NETLINK_CB(cb->skb).portid, 1604 cb->nlh->nlmsg_seq, flags, 1605 IPSET_CMD_LIST); 1606 if (!nlh) { 1607 ret = -EMSGSIZE; 1608 goto release_refcount; 1609 } 1610 if (nla_put_u8(skb, IPSET_ATTR_PROTOCOL, 1611 cb->args[IPSET_CB_PROTO]) || 1612 nla_put_string(skb, IPSET_ATTR_SETNAME, set->name)) 1613 goto nla_put_failure; 1614 if (dump_flags & IPSET_FLAG_LIST_SETNAME) 1615 goto next_set; 1616 switch (cb->args[IPSET_CB_ARG0]) { 1617 case 0: 1618 /* Core header data */ 1619 if (nla_put_string(skb, IPSET_ATTR_TYPENAME, 1620 set->type->name) || 1621 nla_put_u8(skb, IPSET_ATTR_FAMILY, 1622 set->family) || 1623 nla_put_u8(skb, IPSET_ATTR_REVISION, 1624 set->revision)) 1625 goto nla_put_failure; 1626 if (cb->args[IPSET_CB_PROTO] > IPSET_PROTOCOL_MIN && 1627 nla_put_net16(skb, IPSET_ATTR_INDEX, htons(index))) 1628 goto nla_put_failure; 1629 ret = set->variant->head(set, skb); 1630 if (ret < 0) 1631 goto release_refcount; 1632 if (dump_flags & IPSET_FLAG_LIST_HEADER) 1633 goto next_set; 1634 if (set->variant->uref) 1635 set->variant->uref(set, cb, true); 1636 fallthrough; 1637 default: 1638 ret = set->variant->list(set, skb, cb); 1639 if (!cb->args[IPSET_CB_ARG0]) 1640 /* Set is done, proceed with next one */ 1641 goto next_set; 1642 goto release_refcount; 1643 } 1644 } 1645 /* If we dump all sets, continue with dumping last ones */ 1646 if (dump_type == DUMP_ALL) { 1647 dump_type = DUMP_LAST; 1648 cb->args[IPSET_CB_DUMP] = dump_type | (dump_flags << 16); 1649 cb->args[IPSET_CB_INDEX] = 0; 1650 if (set && set->variant->uref) 1651 set->variant->uref(set, cb, false); 1652 goto dump_last; 1653 } 1654 goto out; 1655 1656 nla_put_failure: 1657 ret = -EFAULT; 1658 next_set: 1659 if (dump_type == DUMP_ONE) 1660 cb->args[IPSET_CB_INDEX] = IPSET_INVALID_ID; 1661 else 1662 cb->args[IPSET_CB_INDEX]++; 1663 release_refcount: 1664 /* If there was an error or set is done, release set */ 1665 if (ret || !cb->args[IPSET_CB_ARG0]) { 1666 set = ip_set_ref_netlink(inst, index); 1667 if (set->variant->uref) 1668 set->variant->uref(set, cb, false); 1669 pr_debug("release set %s\n", set->name); 1670 __ip_set_put_netlink(set); 1671 cb->args[IPSET_CB_ARG0] = 0; 1672 } 1673 out: 1674 if (nlh) { 1675 nlmsg_end(skb, nlh); 1676 pr_debug("nlmsg_len: %u\n", nlh->nlmsg_len); 1677 dump_attrs(nlh); 1678 } 1679 1680 return ret < 0 ? ret : skb->len; 1681 } 1682 1683 static int ip_set_dump(struct net *net, struct sock *ctnl, struct sk_buff *skb, 1684 const struct nlmsghdr *nlh, 1685 const struct nlattr * const attr[], 1686 struct netlink_ext_ack *extack) 1687 { 1688 if (unlikely(protocol_min_failed(attr))) 1689 return -IPSET_ERR_PROTOCOL; 1690 1691 { 1692 struct netlink_dump_control c = { 1693 .start = ip_set_dump_start, 1694 .dump = ip_set_dump_do, 1695 .done = ip_set_dump_done, 1696 }; 1697 return netlink_dump_start(ctnl, skb, nlh, &c); 1698 } 1699 } 1700 1701 /* Add, del and test */ 1702 1703 static const struct nla_policy ip_set_adt_policy[IPSET_ATTR_CMD_MAX + 1] = { 1704 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1705 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 1706 .len = IPSET_MAXNAMELEN - 1 }, 1707 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 1708 [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, 1709 [IPSET_ATTR_ADT] = { .type = NLA_NESTED }, 1710 }; 1711 1712 static int 1713 call_ad(struct sock *ctnl, struct sk_buff *skb, struct ip_set *set, 1714 struct nlattr *tb[], enum ipset_adt adt, 1715 u32 flags, bool use_lineno) 1716 { 1717 int ret; 1718 u32 lineno = 0; 1719 bool eexist = flags & IPSET_FLAG_EXIST, retried = false; 1720 1721 do { 1722 ip_set_lock(set); 1723 ret = set->variant->uadt(set, tb, adt, &lineno, flags, retried); 1724 ip_set_unlock(set); 1725 retried = true; 1726 } while (ret == -EAGAIN && 1727 set->variant->resize && 1728 (ret = set->variant->resize(set, retried)) == 0); 1729 1730 if (!ret || (ret == -IPSET_ERR_EXIST && eexist)) 1731 return 0; 1732 if (lineno && use_lineno) { 1733 /* Error in restore/batch mode: send back lineno */ 1734 struct nlmsghdr *rep, *nlh = nlmsg_hdr(skb); 1735 struct sk_buff *skb2; 1736 struct nlmsgerr *errmsg; 1737 size_t payload = min(SIZE_MAX, 1738 sizeof(*errmsg) + nlmsg_len(nlh)); 1739 int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); 1740 struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1]; 1741 struct nlattr *cmdattr; 1742 u32 *errline; 1743 1744 skb2 = nlmsg_new(payload, GFP_KERNEL); 1745 if (!skb2) 1746 return -ENOMEM; 1747 rep = __nlmsg_put(skb2, NETLINK_CB(skb).portid, 1748 nlh->nlmsg_seq, NLMSG_ERROR, payload, 0); 1749 errmsg = nlmsg_data(rep); 1750 errmsg->error = ret; 1751 memcpy(&errmsg->msg, nlh, nlh->nlmsg_len); 1752 cmdattr = (void *)&errmsg->msg + min_len; 1753 1754 ret = nla_parse(cda, IPSET_ATTR_CMD_MAX, cmdattr, 1755 nlh->nlmsg_len - min_len, ip_set_adt_policy, 1756 NULL); 1757 1758 if (ret) { 1759 nlmsg_free(skb2); 1760 return ret; 1761 } 1762 errline = nla_data(cda[IPSET_ATTR_LINENO]); 1763 1764 *errline = lineno; 1765 1766 netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, 1767 MSG_DONTWAIT); 1768 /* Signal netlink not to send its ACK/errmsg. */ 1769 return -EINTR; 1770 } 1771 1772 return ret; 1773 } 1774 1775 static int ip_set_ad(struct net *net, struct sock *ctnl, 1776 struct sk_buff *skb, 1777 enum ipset_adt adt, 1778 const struct nlmsghdr *nlh, 1779 const struct nlattr * const attr[], 1780 struct netlink_ext_ack *extack) 1781 { 1782 struct ip_set_net *inst = ip_set_pernet(net); 1783 struct ip_set *set; 1784 struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; 1785 const struct nlattr *nla; 1786 u32 flags = flag_exist(nlh); 1787 bool use_lineno; 1788 int ret = 0; 1789 1790 if (unlikely(protocol_min_failed(attr) || 1791 !attr[IPSET_ATTR_SETNAME] || 1792 !((attr[IPSET_ATTR_DATA] != NULL) ^ 1793 (attr[IPSET_ATTR_ADT] != NULL)) || 1794 (attr[IPSET_ATTR_DATA] && 1795 !flag_nested(attr[IPSET_ATTR_DATA])) || 1796 (attr[IPSET_ATTR_ADT] && 1797 (!flag_nested(attr[IPSET_ATTR_ADT]) || 1798 !attr[IPSET_ATTR_LINENO])))) 1799 return -IPSET_ERR_PROTOCOL; 1800 1801 set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1802 if (!set) 1803 return -ENOENT; 1804 1805 use_lineno = !!attr[IPSET_ATTR_LINENO]; 1806 if (attr[IPSET_ATTR_DATA]) { 1807 if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, 1808 attr[IPSET_ATTR_DATA], 1809 set->type->adt_policy, NULL)) 1810 return -IPSET_ERR_PROTOCOL; 1811 ret = call_ad(ctnl, skb, set, tb, adt, flags, 1812 use_lineno); 1813 } else { 1814 int nla_rem; 1815 1816 nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { 1817 if (nla_type(nla) != IPSET_ATTR_DATA || 1818 !flag_nested(nla) || 1819 nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, 1820 set->type->adt_policy, NULL)) 1821 return -IPSET_ERR_PROTOCOL; 1822 ret = call_ad(ctnl, skb, set, tb, adt, 1823 flags, use_lineno); 1824 if (ret < 0) 1825 return ret; 1826 } 1827 } 1828 return ret; 1829 } 1830 1831 static int ip_set_uadd(struct net *net, struct sock *ctnl, 1832 struct sk_buff *skb, const struct nlmsghdr *nlh, 1833 const struct nlattr * const attr[], 1834 struct netlink_ext_ack *extack) 1835 { 1836 return ip_set_ad(net, ctnl, skb, 1837 IPSET_ADD, nlh, attr, extack); 1838 } 1839 1840 static int ip_set_udel(struct net *net, struct sock *ctnl, 1841 struct sk_buff *skb, const struct nlmsghdr *nlh, 1842 const struct nlattr * const attr[], 1843 struct netlink_ext_ack *extack) 1844 { 1845 return ip_set_ad(net, ctnl, skb, 1846 IPSET_DEL, nlh, attr, extack); 1847 } 1848 1849 static int ip_set_utest(struct net *net, struct sock *ctnl, struct sk_buff *skb, 1850 const struct nlmsghdr *nlh, 1851 const struct nlattr * const attr[], 1852 struct netlink_ext_ack *extack) 1853 { 1854 struct ip_set_net *inst = ip_set_pernet(net); 1855 struct ip_set *set; 1856 struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; 1857 int ret = 0; 1858 u32 lineno; 1859 1860 if (unlikely(protocol_min_failed(attr) || 1861 !attr[IPSET_ATTR_SETNAME] || 1862 !attr[IPSET_ATTR_DATA] || 1863 !flag_nested(attr[IPSET_ATTR_DATA]))) 1864 return -IPSET_ERR_PROTOCOL; 1865 1866 set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1867 if (!set) 1868 return -ENOENT; 1869 1870 if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA], 1871 set->type->adt_policy, NULL)) 1872 return -IPSET_ERR_PROTOCOL; 1873 1874 rcu_read_lock_bh(); 1875 ret = set->variant->uadt(set, tb, IPSET_TEST, &lineno, 0, 0); 1876 rcu_read_unlock_bh(); 1877 /* Userspace can't trigger element to be re-added */ 1878 if (ret == -EAGAIN) 1879 ret = 1; 1880 1881 return ret > 0 ? 0 : -IPSET_ERR_EXIST; 1882 } 1883 1884 /* Get headed data of a set */ 1885 1886 static int ip_set_header(struct net *net, struct sock *ctnl, 1887 struct sk_buff *skb, const struct nlmsghdr *nlh, 1888 const struct nlattr * const attr[], 1889 struct netlink_ext_ack *extack) 1890 { 1891 struct ip_set_net *inst = ip_set_pernet(net); 1892 const struct ip_set *set; 1893 struct sk_buff *skb2; 1894 struct nlmsghdr *nlh2; 1895 int ret = 0; 1896 1897 if (unlikely(protocol_min_failed(attr) || 1898 !attr[IPSET_ATTR_SETNAME])) 1899 return -IPSET_ERR_PROTOCOL; 1900 1901 set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1902 if (!set) 1903 return -ENOENT; 1904 1905 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1906 if (!skb2) 1907 return -ENOMEM; 1908 1909 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 1910 IPSET_CMD_HEADER); 1911 if (!nlh2) 1912 goto nlmsg_failure; 1913 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) || 1914 nla_put_string(skb2, IPSET_ATTR_SETNAME, set->name) || 1915 nla_put_string(skb2, IPSET_ATTR_TYPENAME, set->type->name) || 1916 nla_put_u8(skb2, IPSET_ATTR_FAMILY, set->family) || 1917 nla_put_u8(skb2, IPSET_ATTR_REVISION, set->revision)) 1918 goto nla_put_failure; 1919 nlmsg_end(skb2, nlh2); 1920 1921 ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); 1922 if (ret < 0) 1923 return ret; 1924 1925 return 0; 1926 1927 nla_put_failure: 1928 nlmsg_cancel(skb2, nlh2); 1929 nlmsg_failure: 1930 kfree_skb(skb2); 1931 return -EMSGSIZE; 1932 } 1933 1934 /* Get type data */ 1935 1936 static const struct nla_policy ip_set_type_policy[IPSET_ATTR_CMD_MAX + 1] = { 1937 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1938 [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, 1939 .len = IPSET_MAXNAMELEN - 1 }, 1940 [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, 1941 }; 1942 1943 static int ip_set_type(struct net *net, struct sock *ctnl, struct sk_buff *skb, 1944 const struct nlmsghdr *nlh, 1945 const struct nlattr * const attr[], 1946 struct netlink_ext_ack *extack) 1947 { 1948 struct sk_buff *skb2; 1949 struct nlmsghdr *nlh2; 1950 u8 family, min, max; 1951 const char *typename; 1952 int ret = 0; 1953 1954 if (unlikely(protocol_min_failed(attr) || 1955 !attr[IPSET_ATTR_TYPENAME] || 1956 !attr[IPSET_ATTR_FAMILY])) 1957 return -IPSET_ERR_PROTOCOL; 1958 1959 family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); 1960 typename = nla_data(attr[IPSET_ATTR_TYPENAME]); 1961 ret = find_set_type_minmax(typename, family, &min, &max); 1962 if (ret) 1963 return ret; 1964 1965 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1966 if (!skb2) 1967 return -ENOMEM; 1968 1969 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 1970 IPSET_CMD_TYPE); 1971 if (!nlh2) 1972 goto nlmsg_failure; 1973 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) || 1974 nla_put_string(skb2, IPSET_ATTR_TYPENAME, typename) || 1975 nla_put_u8(skb2, IPSET_ATTR_FAMILY, family) || 1976 nla_put_u8(skb2, IPSET_ATTR_REVISION, max) || 1977 nla_put_u8(skb2, IPSET_ATTR_REVISION_MIN, min)) 1978 goto nla_put_failure; 1979 nlmsg_end(skb2, nlh2); 1980 1981 pr_debug("Send TYPE, nlmsg_len: %u\n", nlh2->nlmsg_len); 1982 ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); 1983 if (ret < 0) 1984 return ret; 1985 1986 return 0; 1987 1988 nla_put_failure: 1989 nlmsg_cancel(skb2, nlh2); 1990 nlmsg_failure: 1991 kfree_skb(skb2); 1992 return -EMSGSIZE; 1993 } 1994 1995 /* Get protocol version */ 1996 1997 static const struct nla_policy 1998 ip_set_protocol_policy[IPSET_ATTR_CMD_MAX + 1] = { 1999 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 2000 }; 2001 2002 static int ip_set_protocol(struct net *net, struct sock *ctnl, 2003 struct sk_buff *skb, const struct nlmsghdr *nlh, 2004 const struct nlattr * const attr[], 2005 struct netlink_ext_ack *extack) 2006 { 2007 struct sk_buff *skb2; 2008 struct nlmsghdr *nlh2; 2009 int ret = 0; 2010 2011 if (unlikely(!attr[IPSET_ATTR_PROTOCOL])) 2012 return -IPSET_ERR_PROTOCOL; 2013 2014 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2015 if (!skb2) 2016 return -ENOMEM; 2017 2018 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 2019 IPSET_CMD_PROTOCOL); 2020 if (!nlh2) 2021 goto nlmsg_failure; 2022 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL)) 2023 goto nla_put_failure; 2024 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL_MIN, IPSET_PROTOCOL_MIN)) 2025 goto nla_put_failure; 2026 nlmsg_end(skb2, nlh2); 2027 2028 ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); 2029 if (ret < 0) 2030 return ret; 2031 2032 return 0; 2033 2034 nla_put_failure: 2035 nlmsg_cancel(skb2, nlh2); 2036 nlmsg_failure: 2037 kfree_skb(skb2); 2038 return -EMSGSIZE; 2039 } 2040 2041 /* Get set by name or index, from userspace */ 2042 2043 static int ip_set_byname(struct net *net, struct sock *ctnl, 2044 struct sk_buff *skb, const struct nlmsghdr *nlh, 2045 const struct nlattr * const attr[], 2046 struct netlink_ext_ack *extack) 2047 { 2048 struct ip_set_net *inst = ip_set_pernet(net); 2049 struct sk_buff *skb2; 2050 struct nlmsghdr *nlh2; 2051 ip_set_id_t id = IPSET_INVALID_ID; 2052 const struct ip_set *set; 2053 int ret = 0; 2054 2055 if (unlikely(protocol_failed(attr) || 2056 !attr[IPSET_ATTR_SETNAME])) 2057 return -IPSET_ERR_PROTOCOL; 2058 2059 set = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), &id); 2060 if (id == IPSET_INVALID_ID) 2061 return -ENOENT; 2062 2063 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2064 if (!skb2) 2065 return -ENOMEM; 2066 2067 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 2068 IPSET_CMD_GET_BYNAME); 2069 if (!nlh2) 2070 goto nlmsg_failure; 2071 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) || 2072 nla_put_u8(skb2, IPSET_ATTR_FAMILY, set->family) || 2073 nla_put_net16(skb2, IPSET_ATTR_INDEX, htons(id))) 2074 goto nla_put_failure; 2075 nlmsg_end(skb2, nlh2); 2076 2077 ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); 2078 if (ret < 0) 2079 return ret; 2080 2081 return 0; 2082 2083 nla_put_failure: 2084 nlmsg_cancel(skb2, nlh2); 2085 nlmsg_failure: 2086 kfree_skb(skb2); 2087 return -EMSGSIZE; 2088 } 2089 2090 static const struct nla_policy ip_set_index_policy[IPSET_ATTR_CMD_MAX + 1] = { 2091 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 2092 [IPSET_ATTR_INDEX] = { .type = NLA_U16 }, 2093 }; 2094 2095 static int ip_set_byindex(struct net *net, struct sock *ctnl, 2096 struct sk_buff *skb, const struct nlmsghdr *nlh, 2097 const struct nlattr * const attr[], 2098 struct netlink_ext_ack *extack) 2099 { 2100 struct ip_set_net *inst = ip_set_pernet(net); 2101 struct sk_buff *skb2; 2102 struct nlmsghdr *nlh2; 2103 ip_set_id_t id = IPSET_INVALID_ID; 2104 const struct ip_set *set; 2105 int ret = 0; 2106 2107 if (unlikely(protocol_failed(attr) || 2108 !attr[IPSET_ATTR_INDEX])) 2109 return -IPSET_ERR_PROTOCOL; 2110 2111 id = ip_set_get_h16(attr[IPSET_ATTR_INDEX]); 2112 if (id >= inst->ip_set_max) 2113 return -ENOENT; 2114 set = ip_set(inst, id); 2115 if (set == NULL) 2116 return -ENOENT; 2117 2118 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2119 if (!skb2) 2120 return -ENOMEM; 2121 2122 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 2123 IPSET_CMD_GET_BYINDEX); 2124 if (!nlh2) 2125 goto nlmsg_failure; 2126 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) || 2127 nla_put_string(skb2, IPSET_ATTR_SETNAME, set->name)) 2128 goto nla_put_failure; 2129 nlmsg_end(skb2, nlh2); 2130 2131 ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT); 2132 if (ret < 0) 2133 return ret; 2134 2135 return 0; 2136 2137 nla_put_failure: 2138 nlmsg_cancel(skb2, nlh2); 2139 nlmsg_failure: 2140 kfree_skb(skb2); 2141 return -EMSGSIZE; 2142 } 2143 2144 static const struct nfnl_callback ip_set_netlink_subsys_cb[IPSET_MSG_MAX] = { 2145 [IPSET_CMD_NONE] = { 2146 .call = ip_set_none, 2147 .attr_count = IPSET_ATTR_CMD_MAX, 2148 }, 2149 [IPSET_CMD_CREATE] = { 2150 .call = ip_set_create, 2151 .attr_count = IPSET_ATTR_CMD_MAX, 2152 .policy = ip_set_create_policy, 2153 }, 2154 [IPSET_CMD_DESTROY] = { 2155 .call = ip_set_destroy, 2156 .attr_count = IPSET_ATTR_CMD_MAX, 2157 .policy = ip_set_setname_policy, 2158 }, 2159 [IPSET_CMD_FLUSH] = { 2160 .call = ip_set_flush, 2161 .attr_count = IPSET_ATTR_CMD_MAX, 2162 .policy = ip_set_setname_policy, 2163 }, 2164 [IPSET_CMD_RENAME] = { 2165 .call = ip_set_rename, 2166 .attr_count = IPSET_ATTR_CMD_MAX, 2167 .policy = ip_set_setname2_policy, 2168 }, 2169 [IPSET_CMD_SWAP] = { 2170 .call = ip_set_swap, 2171 .attr_count = IPSET_ATTR_CMD_MAX, 2172 .policy = ip_set_setname2_policy, 2173 }, 2174 [IPSET_CMD_LIST] = { 2175 .call = ip_set_dump, 2176 .attr_count = IPSET_ATTR_CMD_MAX, 2177 .policy = ip_set_dump_policy, 2178 }, 2179 [IPSET_CMD_SAVE] = { 2180 .call = ip_set_dump, 2181 .attr_count = IPSET_ATTR_CMD_MAX, 2182 .policy = ip_set_setname_policy, 2183 }, 2184 [IPSET_CMD_ADD] = { 2185 .call = ip_set_uadd, 2186 .attr_count = IPSET_ATTR_CMD_MAX, 2187 .policy = ip_set_adt_policy, 2188 }, 2189 [IPSET_CMD_DEL] = { 2190 .call = ip_set_udel, 2191 .attr_count = IPSET_ATTR_CMD_MAX, 2192 .policy = ip_set_adt_policy, 2193 }, 2194 [IPSET_CMD_TEST] = { 2195 .call = ip_set_utest, 2196 .attr_count = IPSET_ATTR_CMD_MAX, 2197 .policy = ip_set_adt_policy, 2198 }, 2199 [IPSET_CMD_HEADER] = { 2200 .call = ip_set_header, 2201 .attr_count = IPSET_ATTR_CMD_MAX, 2202 .policy = ip_set_setname_policy, 2203 }, 2204 [IPSET_CMD_TYPE] = { 2205 .call = ip_set_type, 2206 .attr_count = IPSET_ATTR_CMD_MAX, 2207 .policy = ip_set_type_policy, 2208 }, 2209 [IPSET_CMD_PROTOCOL] = { 2210 .call = ip_set_protocol, 2211 .attr_count = IPSET_ATTR_CMD_MAX, 2212 .policy = ip_set_protocol_policy, 2213 }, 2214 [IPSET_CMD_GET_BYNAME] = { 2215 .call = ip_set_byname, 2216 .attr_count = IPSET_ATTR_CMD_MAX, 2217 .policy = ip_set_setname_policy, 2218 }, 2219 [IPSET_CMD_GET_BYINDEX] = { 2220 .call = ip_set_byindex, 2221 .attr_count = IPSET_ATTR_CMD_MAX, 2222 .policy = ip_set_index_policy, 2223 }, 2224 }; 2225 2226 static struct nfnetlink_subsystem ip_set_netlink_subsys __read_mostly = { 2227 .name = "ip_set", 2228 .subsys_id = NFNL_SUBSYS_IPSET, 2229 .cb_count = IPSET_MSG_MAX, 2230 .cb = ip_set_netlink_subsys_cb, 2231 }; 2232 2233 /* Interface to iptables/ip6tables */ 2234 2235 static int 2236 ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len) 2237 { 2238 unsigned int *op; 2239 void *data; 2240 int copylen = *len, ret = 0; 2241 struct net *net = sock_net(sk); 2242 struct ip_set_net *inst = ip_set_pernet(net); 2243 2244 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2245 return -EPERM; 2246 if (optval != SO_IP_SET) 2247 return -EBADF; 2248 if (*len < sizeof(unsigned int)) 2249 return -EINVAL; 2250 2251 data = vmalloc(*len); 2252 if (!data) 2253 return -ENOMEM; 2254 if (copy_from_user(data, user, *len) != 0) { 2255 ret = -EFAULT; 2256 goto done; 2257 } 2258 op = data; 2259 2260 if (*op < IP_SET_OP_VERSION) { 2261 /* Check the version at the beginning of operations */ 2262 struct ip_set_req_version *req_version = data; 2263 2264 if (*len < sizeof(struct ip_set_req_version)) { 2265 ret = -EINVAL; 2266 goto done; 2267 } 2268 2269 if (req_version->version < IPSET_PROTOCOL_MIN) { 2270 ret = -EPROTO; 2271 goto done; 2272 } 2273 } 2274 2275 switch (*op) { 2276 case IP_SET_OP_VERSION: { 2277 struct ip_set_req_version *req_version = data; 2278 2279 if (*len != sizeof(struct ip_set_req_version)) { 2280 ret = -EINVAL; 2281 goto done; 2282 } 2283 2284 req_version->version = IPSET_PROTOCOL; 2285 if (copy_to_user(user, req_version, 2286 sizeof(struct ip_set_req_version))) 2287 ret = -EFAULT; 2288 goto done; 2289 } 2290 case IP_SET_OP_GET_BYNAME: { 2291 struct ip_set_req_get_set *req_get = data; 2292 ip_set_id_t id; 2293 2294 if (*len != sizeof(struct ip_set_req_get_set)) { 2295 ret = -EINVAL; 2296 goto done; 2297 } 2298 req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; 2299 nfnl_lock(NFNL_SUBSYS_IPSET); 2300 find_set_and_id(inst, req_get->set.name, &id); 2301 req_get->set.index = id; 2302 nfnl_unlock(NFNL_SUBSYS_IPSET); 2303 goto copy; 2304 } 2305 case IP_SET_OP_GET_FNAME: { 2306 struct ip_set_req_get_set_family *req_get = data; 2307 ip_set_id_t id; 2308 2309 if (*len != sizeof(struct ip_set_req_get_set_family)) { 2310 ret = -EINVAL; 2311 goto done; 2312 } 2313 req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; 2314 nfnl_lock(NFNL_SUBSYS_IPSET); 2315 find_set_and_id(inst, req_get->set.name, &id); 2316 req_get->set.index = id; 2317 if (id != IPSET_INVALID_ID) 2318 req_get->family = ip_set(inst, id)->family; 2319 nfnl_unlock(NFNL_SUBSYS_IPSET); 2320 goto copy; 2321 } 2322 case IP_SET_OP_GET_BYINDEX: { 2323 struct ip_set_req_get_set *req_get = data; 2324 struct ip_set *set; 2325 2326 if (*len != sizeof(struct ip_set_req_get_set) || 2327 req_get->set.index >= inst->ip_set_max) { 2328 ret = -EINVAL; 2329 goto done; 2330 } 2331 nfnl_lock(NFNL_SUBSYS_IPSET); 2332 set = ip_set(inst, req_get->set.index); 2333 ret = strscpy(req_get->set.name, set ? set->name : "", 2334 IPSET_MAXNAMELEN); 2335 nfnl_unlock(NFNL_SUBSYS_IPSET); 2336 if (ret < 0) 2337 goto done; 2338 goto copy; 2339 } 2340 default: 2341 ret = -EBADMSG; 2342 goto done; 2343 } /* end of switch(op) */ 2344 2345 copy: 2346 if (copy_to_user(user, data, copylen)) 2347 ret = -EFAULT; 2348 2349 done: 2350 vfree(data); 2351 if (ret > 0) 2352 ret = 0; 2353 return ret; 2354 } 2355 2356 static struct nf_sockopt_ops so_set __read_mostly = { 2357 .pf = PF_INET, 2358 .get_optmin = SO_IP_SET, 2359 .get_optmax = SO_IP_SET + 1, 2360 .get = ip_set_sockfn_get, 2361 .owner = THIS_MODULE, 2362 }; 2363 2364 static int __net_init 2365 ip_set_net_init(struct net *net) 2366 { 2367 struct ip_set_net *inst = ip_set_pernet(net); 2368 struct ip_set **list; 2369 2370 inst->ip_set_max = max_sets ? max_sets : CONFIG_IP_SET_MAX; 2371 if (inst->ip_set_max >= IPSET_INVALID_ID) 2372 inst->ip_set_max = IPSET_INVALID_ID - 1; 2373 2374 list = kvcalloc(inst->ip_set_max, sizeof(struct ip_set *), GFP_KERNEL); 2375 if (!list) 2376 return -ENOMEM; 2377 inst->is_deleted = false; 2378 inst->is_destroyed = false; 2379 rcu_assign_pointer(inst->ip_set_list, list); 2380 return 0; 2381 } 2382 2383 static void __net_exit 2384 ip_set_net_exit(struct net *net) 2385 { 2386 struct ip_set_net *inst = ip_set_pernet(net); 2387 2388 struct ip_set *set = NULL; 2389 ip_set_id_t i; 2390 2391 inst->is_deleted = true; /* flag for ip_set_nfnl_put */ 2392 2393 nfnl_lock(NFNL_SUBSYS_IPSET); 2394 for (i = 0; i < inst->ip_set_max; i++) { 2395 set = ip_set(inst, i); 2396 if (set) { 2397 ip_set(inst, i) = NULL; 2398 ip_set_destroy_set(set); 2399 } 2400 } 2401 nfnl_unlock(NFNL_SUBSYS_IPSET); 2402 kvfree(rcu_dereference_protected(inst->ip_set_list, 1)); 2403 } 2404 2405 static struct pernet_operations ip_set_net_ops = { 2406 .init = ip_set_net_init, 2407 .exit = ip_set_net_exit, 2408 .id = &ip_set_net_id, 2409 .size = sizeof(struct ip_set_net), 2410 }; 2411 2412 static int __init 2413 ip_set_init(void) 2414 { 2415 int ret = register_pernet_subsys(&ip_set_net_ops); 2416 2417 if (ret) { 2418 pr_err("ip_set: cannot register pernet_subsys.\n"); 2419 return ret; 2420 } 2421 2422 ret = nfnetlink_subsys_register(&ip_set_netlink_subsys); 2423 if (ret != 0) { 2424 pr_err("ip_set: cannot register with nfnetlink.\n"); 2425 unregister_pernet_subsys(&ip_set_net_ops); 2426 return ret; 2427 } 2428 2429 ret = nf_register_sockopt(&so_set); 2430 if (ret != 0) { 2431 pr_err("SO_SET registry failed: %d\n", ret); 2432 nfnetlink_subsys_unregister(&ip_set_netlink_subsys); 2433 unregister_pernet_subsys(&ip_set_net_ops); 2434 return ret; 2435 } 2436 2437 return 0; 2438 } 2439 2440 static void __exit 2441 ip_set_fini(void) 2442 { 2443 nf_unregister_sockopt(&so_set); 2444 nfnetlink_subsys_unregister(&ip_set_netlink_subsys); 2445 2446 unregister_pernet_subsys(&ip_set_net_ops); 2447 pr_debug("these are the famous last words\n"); 2448 } 2449 2450 module_init(ip_set_init); 2451 module_exit(ip_set_fini); 2452 2453 MODULE_DESCRIPTION("ip_set: protocol " __stringify(IPSET_PROTOCOL)); 2454