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 return nfnl_msg_put(skb, portid, seq, 967 nfnl_msg_type(NFNL_SUBSYS_IPSET, cmd), flags, 968 NFPROTO_IPV4, NFNETLINK_V0, 0); 969 } 970 971 /* Create a set */ 972 973 static const struct nla_policy ip_set_create_policy[IPSET_ATTR_CMD_MAX + 1] = { 974 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 975 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 976 .len = IPSET_MAXNAMELEN - 1 }, 977 [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, 978 .len = IPSET_MAXNAMELEN - 1}, 979 [IPSET_ATTR_REVISION] = { .type = NLA_U8 }, 980 [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, 981 [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, 982 }; 983 984 static struct ip_set * 985 find_set_and_id(struct ip_set_net *inst, const char *name, ip_set_id_t *id) 986 { 987 struct ip_set *set = NULL; 988 ip_set_id_t i; 989 990 *id = IPSET_INVALID_ID; 991 for (i = 0; i < inst->ip_set_max; i++) { 992 set = ip_set(inst, i); 993 if (set && STRNCMP(set->name, name)) { 994 *id = i; 995 break; 996 } 997 } 998 return (*id == IPSET_INVALID_ID ? NULL : set); 999 } 1000 1001 static inline struct ip_set * 1002 find_set(struct ip_set_net *inst, const char *name) 1003 { 1004 ip_set_id_t id; 1005 1006 return find_set_and_id(inst, name, &id); 1007 } 1008 1009 static int 1010 find_free_id(struct ip_set_net *inst, const char *name, ip_set_id_t *index, 1011 struct ip_set **set) 1012 { 1013 struct ip_set *s; 1014 ip_set_id_t i; 1015 1016 *index = IPSET_INVALID_ID; 1017 for (i = 0; i < inst->ip_set_max; i++) { 1018 s = ip_set(inst, i); 1019 if (!s) { 1020 if (*index == IPSET_INVALID_ID) 1021 *index = i; 1022 } else if (STRNCMP(name, s->name)) { 1023 /* Name clash */ 1024 *set = s; 1025 return -EEXIST; 1026 } 1027 } 1028 if (*index == IPSET_INVALID_ID) 1029 /* No free slot remained */ 1030 return -IPSET_ERR_MAX_SETS; 1031 return 0; 1032 } 1033 1034 static int ip_set_none(struct sk_buff *skb, const struct nfnl_info *info, 1035 const struct nlattr * const attr[]) 1036 { 1037 return -EOPNOTSUPP; 1038 } 1039 1040 static int ip_set_create(struct sk_buff *skb, const struct nfnl_info *info, 1041 const struct nlattr * const attr[]) 1042 { 1043 struct ip_set_net *inst = ip_set_pernet(info->net); 1044 struct ip_set *set, *clash = NULL; 1045 ip_set_id_t index = IPSET_INVALID_ID; 1046 struct nlattr *tb[IPSET_ATTR_CREATE_MAX + 1] = {}; 1047 const char *name, *typename; 1048 u8 family, revision; 1049 u32 flags = flag_exist(info->nlh); 1050 int ret = 0; 1051 1052 if (unlikely(protocol_min_failed(attr) || 1053 !attr[IPSET_ATTR_SETNAME] || 1054 !attr[IPSET_ATTR_TYPENAME] || 1055 !attr[IPSET_ATTR_REVISION] || 1056 !attr[IPSET_ATTR_FAMILY] || 1057 (attr[IPSET_ATTR_DATA] && 1058 !flag_nested(attr[IPSET_ATTR_DATA])))) 1059 return -IPSET_ERR_PROTOCOL; 1060 1061 name = nla_data(attr[IPSET_ATTR_SETNAME]); 1062 typename = nla_data(attr[IPSET_ATTR_TYPENAME]); 1063 family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); 1064 revision = nla_get_u8(attr[IPSET_ATTR_REVISION]); 1065 pr_debug("setname: %s, typename: %s, family: %s, revision: %u\n", 1066 name, typename, family_name(family), revision); 1067 1068 /* First, and without any locks, allocate and initialize 1069 * a normal base set structure. 1070 */ 1071 set = kzalloc(sizeof(*set), GFP_KERNEL); 1072 if (!set) 1073 return -ENOMEM; 1074 spin_lock_init(&set->lock); 1075 strlcpy(set->name, name, IPSET_MAXNAMELEN); 1076 set->family = family; 1077 set->revision = revision; 1078 1079 /* Next, check that we know the type, and take 1080 * a reference on the type, to make sure it stays available 1081 * while constructing our new set. 1082 * 1083 * After referencing the type, we try to create the type 1084 * specific part of the set without holding any locks. 1085 */ 1086 ret = find_set_type_get(typename, family, revision, &set->type); 1087 if (ret) 1088 goto out; 1089 1090 /* Without holding any locks, create private part. */ 1091 if (attr[IPSET_ATTR_DATA] && 1092 nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA], 1093 set->type->create_policy, NULL)) { 1094 ret = -IPSET_ERR_PROTOCOL; 1095 goto put_out; 1096 } 1097 /* Set create flags depending on the type revision */ 1098 set->flags |= set->type->create_flags[revision]; 1099 1100 ret = set->type->create(info->net, set, tb, flags); 1101 if (ret != 0) 1102 goto put_out; 1103 1104 /* BTW, ret==0 here. */ 1105 1106 /* Here, we have a valid, constructed set and we are protected 1107 * by the nfnl mutex. Find the first free index in ip_set_list 1108 * and check clashing. 1109 */ 1110 ret = find_free_id(inst, set->name, &index, &clash); 1111 if (ret == -EEXIST) { 1112 /* If this is the same set and requested, ignore error */ 1113 if ((flags & IPSET_FLAG_EXIST) && 1114 STRNCMP(set->type->name, clash->type->name) && 1115 set->type->family == clash->type->family && 1116 set->type->revision_min == clash->type->revision_min && 1117 set->type->revision_max == clash->type->revision_max && 1118 set->variant->same_set(set, clash)) 1119 ret = 0; 1120 goto cleanup; 1121 } else if (ret == -IPSET_ERR_MAX_SETS) { 1122 struct ip_set **list, **tmp; 1123 ip_set_id_t i = inst->ip_set_max + IP_SET_INC; 1124 1125 if (i < inst->ip_set_max || i == IPSET_INVALID_ID) 1126 /* Wraparound */ 1127 goto cleanup; 1128 1129 list = kvcalloc(i, sizeof(struct ip_set *), GFP_KERNEL); 1130 if (!list) 1131 goto cleanup; 1132 /* nfnl mutex is held, both lists are valid */ 1133 tmp = ip_set_dereference(inst->ip_set_list); 1134 memcpy(list, tmp, sizeof(struct ip_set *) * inst->ip_set_max); 1135 rcu_assign_pointer(inst->ip_set_list, list); 1136 /* Make sure all current packets have passed through */ 1137 synchronize_net(); 1138 /* Use new list */ 1139 index = inst->ip_set_max; 1140 inst->ip_set_max = i; 1141 kvfree(tmp); 1142 ret = 0; 1143 } else if (ret) { 1144 goto cleanup; 1145 } 1146 1147 /* Finally! Add our shiny new set to the list, and be done. */ 1148 pr_debug("create: '%s' created with index %u!\n", set->name, index); 1149 ip_set(inst, index) = set; 1150 1151 return ret; 1152 1153 cleanup: 1154 set->variant->destroy(set); 1155 put_out: 1156 module_put(set->type->me); 1157 out: 1158 kfree(set); 1159 return ret; 1160 } 1161 1162 /* Destroy sets */ 1163 1164 static const struct nla_policy 1165 ip_set_setname_policy[IPSET_ATTR_CMD_MAX + 1] = { 1166 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1167 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 1168 .len = IPSET_MAXNAMELEN - 1 }, 1169 }; 1170 1171 static void 1172 ip_set_destroy_set(struct ip_set *set) 1173 { 1174 pr_debug("set: %s\n", set->name); 1175 1176 /* Must call it without holding any lock */ 1177 set->variant->destroy(set); 1178 module_put(set->type->me); 1179 kfree(set); 1180 } 1181 1182 static int ip_set_destroy(struct sk_buff *skb, const struct nfnl_info *info, 1183 const struct nlattr * const attr[]) 1184 { 1185 struct ip_set_net *inst = ip_set_pernet(info->net); 1186 struct ip_set *s; 1187 ip_set_id_t i; 1188 int ret = 0; 1189 1190 if (unlikely(protocol_min_failed(attr))) 1191 return -IPSET_ERR_PROTOCOL; 1192 1193 /* Must wait for flush to be really finished in list:set */ 1194 rcu_barrier(); 1195 1196 /* Commands are serialized and references are 1197 * protected by the ip_set_ref_lock. 1198 * External systems (i.e. xt_set) must call 1199 * ip_set_put|get_nfnl_* functions, that way we 1200 * can safely check references here. 1201 * 1202 * list:set timer can only decrement the reference 1203 * counter, so if it's already zero, we can proceed 1204 * without holding the lock. 1205 */ 1206 read_lock_bh(&ip_set_ref_lock); 1207 if (!attr[IPSET_ATTR_SETNAME]) { 1208 for (i = 0; i < inst->ip_set_max; i++) { 1209 s = ip_set(inst, i); 1210 if (s && (s->ref || s->ref_netlink)) { 1211 ret = -IPSET_ERR_BUSY; 1212 goto out; 1213 } 1214 } 1215 inst->is_destroyed = true; 1216 read_unlock_bh(&ip_set_ref_lock); 1217 for (i = 0; i < inst->ip_set_max; i++) { 1218 s = ip_set(inst, i); 1219 if (s) { 1220 ip_set(inst, i) = NULL; 1221 ip_set_destroy_set(s); 1222 } 1223 } 1224 /* Modified by ip_set_destroy() only, which is serialized */ 1225 inst->is_destroyed = false; 1226 } else { 1227 u32 flags = flag_exist(info->nlh); 1228 s = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), 1229 &i); 1230 if (!s) { 1231 if (!(flags & IPSET_FLAG_EXIST)) 1232 ret = -ENOENT; 1233 goto out; 1234 } else if (s->ref || s->ref_netlink) { 1235 ret = -IPSET_ERR_BUSY; 1236 goto out; 1237 } 1238 ip_set(inst, i) = NULL; 1239 read_unlock_bh(&ip_set_ref_lock); 1240 1241 ip_set_destroy_set(s); 1242 } 1243 return 0; 1244 out: 1245 read_unlock_bh(&ip_set_ref_lock); 1246 return ret; 1247 } 1248 1249 /* Flush sets */ 1250 1251 static void 1252 ip_set_flush_set(struct ip_set *set) 1253 { 1254 pr_debug("set: %s\n", set->name); 1255 1256 ip_set_lock(set); 1257 set->variant->flush(set); 1258 ip_set_unlock(set); 1259 } 1260 1261 static int ip_set_flush(struct sk_buff *skb, const struct nfnl_info *info, 1262 const struct nlattr * const attr[]) 1263 { 1264 struct ip_set_net *inst = ip_set_pernet(info->net); 1265 struct ip_set *s; 1266 ip_set_id_t i; 1267 1268 if (unlikely(protocol_min_failed(attr))) 1269 return -IPSET_ERR_PROTOCOL; 1270 1271 if (!attr[IPSET_ATTR_SETNAME]) { 1272 for (i = 0; i < inst->ip_set_max; i++) { 1273 s = ip_set(inst, i); 1274 if (s) 1275 ip_set_flush_set(s); 1276 } 1277 } else { 1278 s = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1279 if (!s) 1280 return -ENOENT; 1281 1282 ip_set_flush_set(s); 1283 } 1284 1285 return 0; 1286 } 1287 1288 /* Rename a set */ 1289 1290 static const struct nla_policy 1291 ip_set_setname2_policy[IPSET_ATTR_CMD_MAX + 1] = { 1292 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1293 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 1294 .len = IPSET_MAXNAMELEN - 1 }, 1295 [IPSET_ATTR_SETNAME2] = { .type = NLA_NUL_STRING, 1296 .len = IPSET_MAXNAMELEN - 1 }, 1297 }; 1298 1299 static int ip_set_rename(struct sk_buff *skb, const struct nfnl_info *info, 1300 const struct nlattr * const attr[]) 1301 { 1302 struct ip_set_net *inst = ip_set_pernet(info->net); 1303 struct ip_set *set, *s; 1304 const char *name2; 1305 ip_set_id_t i; 1306 int ret = 0; 1307 1308 if (unlikely(protocol_min_failed(attr) || 1309 !attr[IPSET_ATTR_SETNAME] || 1310 !attr[IPSET_ATTR_SETNAME2])) 1311 return -IPSET_ERR_PROTOCOL; 1312 1313 set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1314 if (!set) 1315 return -ENOENT; 1316 1317 write_lock_bh(&ip_set_ref_lock); 1318 if (set->ref != 0 || set->ref_netlink != 0) { 1319 ret = -IPSET_ERR_REFERENCED; 1320 goto out; 1321 } 1322 1323 name2 = nla_data(attr[IPSET_ATTR_SETNAME2]); 1324 for (i = 0; i < inst->ip_set_max; i++) { 1325 s = ip_set(inst, i); 1326 if (s && STRNCMP(s->name, name2)) { 1327 ret = -IPSET_ERR_EXIST_SETNAME2; 1328 goto out; 1329 } 1330 } 1331 strncpy(set->name, name2, IPSET_MAXNAMELEN); 1332 1333 out: 1334 write_unlock_bh(&ip_set_ref_lock); 1335 return ret; 1336 } 1337 1338 /* Swap two sets so that name/index points to the other. 1339 * References and set names are also swapped. 1340 * 1341 * The commands are serialized by the nfnl mutex and references are 1342 * protected by the ip_set_ref_lock. The kernel interfaces 1343 * do not hold the mutex but the pointer settings are atomic 1344 * so the ip_set_list always contains valid pointers to the sets. 1345 */ 1346 1347 static int ip_set_swap(struct sk_buff *skb, const struct nfnl_info *info, 1348 const struct nlattr * const attr[]) 1349 { 1350 struct ip_set_net *inst = ip_set_pernet(info->net); 1351 struct ip_set *from, *to; 1352 ip_set_id_t from_id, to_id; 1353 char from_name[IPSET_MAXNAMELEN]; 1354 1355 if (unlikely(protocol_min_failed(attr) || 1356 !attr[IPSET_ATTR_SETNAME] || 1357 !attr[IPSET_ATTR_SETNAME2])) 1358 return -IPSET_ERR_PROTOCOL; 1359 1360 from = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), 1361 &from_id); 1362 if (!from) 1363 return -ENOENT; 1364 1365 to = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME2]), 1366 &to_id); 1367 if (!to) 1368 return -IPSET_ERR_EXIST_SETNAME2; 1369 1370 /* Features must not change. 1371 * Not an artifical restriction anymore, as we must prevent 1372 * possible loops created by swapping in setlist type of sets. 1373 */ 1374 if (!(from->type->features == to->type->features && 1375 from->family == to->family)) 1376 return -IPSET_ERR_TYPE_MISMATCH; 1377 1378 write_lock_bh(&ip_set_ref_lock); 1379 1380 if (from->ref_netlink || to->ref_netlink) { 1381 write_unlock_bh(&ip_set_ref_lock); 1382 return -EBUSY; 1383 } 1384 1385 strncpy(from_name, from->name, IPSET_MAXNAMELEN); 1386 strncpy(from->name, to->name, IPSET_MAXNAMELEN); 1387 strncpy(to->name, from_name, IPSET_MAXNAMELEN); 1388 1389 swap(from->ref, to->ref); 1390 ip_set(inst, from_id) = to; 1391 ip_set(inst, to_id) = from; 1392 write_unlock_bh(&ip_set_ref_lock); 1393 1394 return 0; 1395 } 1396 1397 /* List/save set data */ 1398 1399 #define DUMP_INIT 0 1400 #define DUMP_ALL 1 1401 #define DUMP_ONE 2 1402 #define DUMP_LAST 3 1403 1404 #define DUMP_TYPE(arg) (((u32)(arg)) & 0x0000FFFF) 1405 #define DUMP_FLAGS(arg) (((u32)(arg)) >> 16) 1406 1407 int 1408 ip_set_put_flags(struct sk_buff *skb, struct ip_set *set) 1409 { 1410 u32 cadt_flags = 0; 1411 1412 if (SET_WITH_TIMEOUT(set)) 1413 if (unlikely(nla_put_net32(skb, IPSET_ATTR_TIMEOUT, 1414 htonl(set->timeout)))) 1415 return -EMSGSIZE; 1416 if (SET_WITH_COUNTER(set)) 1417 cadt_flags |= IPSET_FLAG_WITH_COUNTERS; 1418 if (SET_WITH_COMMENT(set)) 1419 cadt_flags |= IPSET_FLAG_WITH_COMMENT; 1420 if (SET_WITH_SKBINFO(set)) 1421 cadt_flags |= IPSET_FLAG_WITH_SKBINFO; 1422 if (SET_WITH_FORCEADD(set)) 1423 cadt_flags |= IPSET_FLAG_WITH_FORCEADD; 1424 1425 if (!cadt_flags) 1426 return 0; 1427 return nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(cadt_flags)); 1428 } 1429 EXPORT_SYMBOL_GPL(ip_set_put_flags); 1430 1431 static int 1432 ip_set_dump_done(struct netlink_callback *cb) 1433 { 1434 if (cb->args[IPSET_CB_ARG0]) { 1435 struct ip_set_net *inst = 1436 (struct ip_set_net *)cb->args[IPSET_CB_NET]; 1437 ip_set_id_t index = (ip_set_id_t)cb->args[IPSET_CB_INDEX]; 1438 struct ip_set *set = ip_set_ref_netlink(inst, index); 1439 1440 if (set->variant->uref) 1441 set->variant->uref(set, cb, false); 1442 pr_debug("release set %s\n", set->name); 1443 __ip_set_put_netlink(set); 1444 } 1445 return 0; 1446 } 1447 1448 static inline void 1449 dump_attrs(struct nlmsghdr *nlh) 1450 { 1451 const struct nlattr *attr; 1452 int rem; 1453 1454 pr_debug("dump nlmsg\n"); 1455 nlmsg_for_each_attr(attr, nlh, sizeof(struct nfgenmsg), rem) { 1456 pr_debug("type: %u, len %u\n", nla_type(attr), attr->nla_len); 1457 } 1458 } 1459 1460 static const struct nla_policy 1461 ip_set_dump_policy[IPSET_ATTR_CMD_MAX + 1] = { 1462 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1463 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 1464 .len = IPSET_MAXNAMELEN - 1 }, 1465 [IPSET_ATTR_FLAGS] = { .type = NLA_U32 }, 1466 }; 1467 1468 static int 1469 ip_set_dump_start(struct netlink_callback *cb) 1470 { 1471 struct nlmsghdr *nlh = nlmsg_hdr(cb->skb); 1472 int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); 1473 struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1]; 1474 struct nlattr *attr = (void *)nlh + min_len; 1475 struct sk_buff *skb = cb->skb; 1476 struct ip_set_net *inst = ip_set_pernet(sock_net(skb->sk)); 1477 u32 dump_type; 1478 int ret; 1479 1480 ret = nla_parse(cda, IPSET_ATTR_CMD_MAX, attr, 1481 nlh->nlmsg_len - min_len, 1482 ip_set_dump_policy, NULL); 1483 if (ret) 1484 goto error; 1485 1486 cb->args[IPSET_CB_PROTO] = nla_get_u8(cda[IPSET_ATTR_PROTOCOL]); 1487 if (cda[IPSET_ATTR_SETNAME]) { 1488 ip_set_id_t index; 1489 struct ip_set *set; 1490 1491 set = find_set_and_id(inst, nla_data(cda[IPSET_ATTR_SETNAME]), 1492 &index); 1493 if (!set) { 1494 ret = -ENOENT; 1495 goto error; 1496 } 1497 dump_type = DUMP_ONE; 1498 cb->args[IPSET_CB_INDEX] = index; 1499 } else { 1500 dump_type = DUMP_ALL; 1501 } 1502 1503 if (cda[IPSET_ATTR_FLAGS]) { 1504 u32 f = ip_set_get_h32(cda[IPSET_ATTR_FLAGS]); 1505 1506 dump_type |= (f << 16); 1507 } 1508 cb->args[IPSET_CB_NET] = (unsigned long)inst; 1509 cb->args[IPSET_CB_DUMP] = dump_type; 1510 1511 return 0; 1512 1513 error: 1514 /* We have to create and send the error message manually :-( */ 1515 if (nlh->nlmsg_flags & NLM_F_ACK) { 1516 netlink_ack(cb->skb, nlh, ret, NULL); 1517 } 1518 return ret; 1519 } 1520 1521 static int 1522 ip_set_dump_do(struct sk_buff *skb, struct netlink_callback *cb) 1523 { 1524 ip_set_id_t index = IPSET_INVALID_ID, max; 1525 struct ip_set *set = NULL; 1526 struct nlmsghdr *nlh = NULL; 1527 unsigned int flags = NETLINK_CB(cb->skb).portid ? NLM_F_MULTI : 0; 1528 struct ip_set_net *inst = ip_set_pernet(sock_net(skb->sk)); 1529 u32 dump_type, dump_flags; 1530 bool is_destroyed; 1531 int ret = 0; 1532 1533 if (!cb->args[IPSET_CB_DUMP]) 1534 return -EINVAL; 1535 1536 if (cb->args[IPSET_CB_INDEX] >= inst->ip_set_max) 1537 goto out; 1538 1539 dump_type = DUMP_TYPE(cb->args[IPSET_CB_DUMP]); 1540 dump_flags = DUMP_FLAGS(cb->args[IPSET_CB_DUMP]); 1541 max = dump_type == DUMP_ONE ? cb->args[IPSET_CB_INDEX] + 1 1542 : inst->ip_set_max; 1543 dump_last: 1544 pr_debug("dump type, flag: %u %u index: %ld\n", 1545 dump_type, dump_flags, cb->args[IPSET_CB_INDEX]); 1546 for (; cb->args[IPSET_CB_INDEX] < max; cb->args[IPSET_CB_INDEX]++) { 1547 index = (ip_set_id_t)cb->args[IPSET_CB_INDEX]; 1548 write_lock_bh(&ip_set_ref_lock); 1549 set = ip_set(inst, index); 1550 is_destroyed = inst->is_destroyed; 1551 if (!set || is_destroyed) { 1552 write_unlock_bh(&ip_set_ref_lock); 1553 if (dump_type == DUMP_ONE) { 1554 ret = -ENOENT; 1555 goto out; 1556 } 1557 if (is_destroyed) { 1558 /* All sets are just being destroyed */ 1559 ret = 0; 1560 goto out; 1561 } 1562 continue; 1563 } 1564 /* When dumping all sets, we must dump "sorted" 1565 * so that lists (unions of sets) are dumped last. 1566 */ 1567 if (dump_type != DUMP_ONE && 1568 ((dump_type == DUMP_ALL) == 1569 !!(set->type->features & IPSET_DUMP_LAST))) { 1570 write_unlock_bh(&ip_set_ref_lock); 1571 continue; 1572 } 1573 pr_debug("List set: %s\n", set->name); 1574 if (!cb->args[IPSET_CB_ARG0]) { 1575 /* Start listing: make sure set won't be destroyed */ 1576 pr_debug("reference set\n"); 1577 set->ref_netlink++; 1578 } 1579 write_unlock_bh(&ip_set_ref_lock); 1580 nlh = start_msg(skb, NETLINK_CB(cb->skb).portid, 1581 cb->nlh->nlmsg_seq, flags, 1582 IPSET_CMD_LIST); 1583 if (!nlh) { 1584 ret = -EMSGSIZE; 1585 goto release_refcount; 1586 } 1587 if (nla_put_u8(skb, IPSET_ATTR_PROTOCOL, 1588 cb->args[IPSET_CB_PROTO]) || 1589 nla_put_string(skb, IPSET_ATTR_SETNAME, set->name)) 1590 goto nla_put_failure; 1591 if (dump_flags & IPSET_FLAG_LIST_SETNAME) 1592 goto next_set; 1593 switch (cb->args[IPSET_CB_ARG0]) { 1594 case 0: 1595 /* Core header data */ 1596 if (nla_put_string(skb, IPSET_ATTR_TYPENAME, 1597 set->type->name) || 1598 nla_put_u8(skb, IPSET_ATTR_FAMILY, 1599 set->family) || 1600 nla_put_u8(skb, IPSET_ATTR_REVISION, 1601 set->revision)) 1602 goto nla_put_failure; 1603 if (cb->args[IPSET_CB_PROTO] > IPSET_PROTOCOL_MIN && 1604 nla_put_net16(skb, IPSET_ATTR_INDEX, htons(index))) 1605 goto nla_put_failure; 1606 ret = set->variant->head(set, skb); 1607 if (ret < 0) 1608 goto release_refcount; 1609 if (dump_flags & IPSET_FLAG_LIST_HEADER) 1610 goto next_set; 1611 if (set->variant->uref) 1612 set->variant->uref(set, cb, true); 1613 fallthrough; 1614 default: 1615 ret = set->variant->list(set, skb, cb); 1616 if (!cb->args[IPSET_CB_ARG0]) 1617 /* Set is done, proceed with next one */ 1618 goto next_set; 1619 goto release_refcount; 1620 } 1621 } 1622 /* If we dump all sets, continue with dumping last ones */ 1623 if (dump_type == DUMP_ALL) { 1624 dump_type = DUMP_LAST; 1625 cb->args[IPSET_CB_DUMP] = dump_type | (dump_flags << 16); 1626 cb->args[IPSET_CB_INDEX] = 0; 1627 if (set && set->variant->uref) 1628 set->variant->uref(set, cb, false); 1629 goto dump_last; 1630 } 1631 goto out; 1632 1633 nla_put_failure: 1634 ret = -EFAULT; 1635 next_set: 1636 if (dump_type == DUMP_ONE) 1637 cb->args[IPSET_CB_INDEX] = IPSET_INVALID_ID; 1638 else 1639 cb->args[IPSET_CB_INDEX]++; 1640 release_refcount: 1641 /* If there was an error or set is done, release set */ 1642 if (ret || !cb->args[IPSET_CB_ARG0]) { 1643 set = ip_set_ref_netlink(inst, index); 1644 if (set->variant->uref) 1645 set->variant->uref(set, cb, false); 1646 pr_debug("release set %s\n", set->name); 1647 __ip_set_put_netlink(set); 1648 cb->args[IPSET_CB_ARG0] = 0; 1649 } 1650 out: 1651 if (nlh) { 1652 nlmsg_end(skb, nlh); 1653 pr_debug("nlmsg_len: %u\n", nlh->nlmsg_len); 1654 dump_attrs(nlh); 1655 } 1656 1657 return ret < 0 ? ret : skb->len; 1658 } 1659 1660 static int ip_set_dump(struct sk_buff *skb, const struct nfnl_info *info, 1661 const struct nlattr * const attr[]) 1662 { 1663 if (unlikely(protocol_min_failed(attr))) 1664 return -IPSET_ERR_PROTOCOL; 1665 1666 { 1667 struct netlink_dump_control c = { 1668 .start = ip_set_dump_start, 1669 .dump = ip_set_dump_do, 1670 .done = ip_set_dump_done, 1671 }; 1672 return netlink_dump_start(info->sk, skb, info->nlh, &c); 1673 } 1674 } 1675 1676 /* Add, del and test */ 1677 1678 static const struct nla_policy ip_set_adt_policy[IPSET_ATTR_CMD_MAX + 1] = { 1679 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1680 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 1681 .len = IPSET_MAXNAMELEN - 1 }, 1682 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 1683 [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, 1684 [IPSET_ATTR_ADT] = { .type = NLA_NESTED }, 1685 }; 1686 1687 static int 1688 call_ad(struct net *net, struct sock *ctnl, struct sk_buff *skb, 1689 struct ip_set *set, struct nlattr *tb[], enum ipset_adt adt, 1690 u32 flags, bool use_lineno) 1691 { 1692 int ret; 1693 u32 lineno = 0; 1694 bool eexist = flags & IPSET_FLAG_EXIST, retried = false; 1695 1696 do { 1697 ip_set_lock(set); 1698 ret = set->variant->uadt(set, tb, adt, &lineno, flags, retried); 1699 ip_set_unlock(set); 1700 retried = true; 1701 } while (ret == -EAGAIN && 1702 set->variant->resize && 1703 (ret = set->variant->resize(set, retried)) == 0); 1704 1705 if (!ret || (ret == -IPSET_ERR_EXIST && eexist)) 1706 return 0; 1707 if (lineno && use_lineno) { 1708 /* Error in restore/batch mode: send back lineno */ 1709 struct nlmsghdr *rep, *nlh = nlmsg_hdr(skb); 1710 struct sk_buff *skb2; 1711 struct nlmsgerr *errmsg; 1712 size_t payload = min(SIZE_MAX, 1713 sizeof(*errmsg) + nlmsg_len(nlh)); 1714 int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); 1715 struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1]; 1716 struct nlattr *cmdattr; 1717 u32 *errline; 1718 1719 skb2 = nlmsg_new(payload, GFP_KERNEL); 1720 if (!skb2) 1721 return -ENOMEM; 1722 rep = __nlmsg_put(skb2, NETLINK_CB(skb).portid, 1723 nlh->nlmsg_seq, NLMSG_ERROR, payload, 0); 1724 errmsg = nlmsg_data(rep); 1725 errmsg->error = ret; 1726 memcpy(&errmsg->msg, nlh, nlh->nlmsg_len); 1727 cmdattr = (void *)&errmsg->msg + min_len; 1728 1729 ret = nla_parse(cda, IPSET_ATTR_CMD_MAX, cmdattr, 1730 nlh->nlmsg_len - min_len, ip_set_adt_policy, 1731 NULL); 1732 1733 if (ret) { 1734 nlmsg_free(skb2); 1735 return ret; 1736 } 1737 errline = nla_data(cda[IPSET_ATTR_LINENO]); 1738 1739 *errline = lineno; 1740 1741 nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 1742 /* Signal netlink not to send its ACK/errmsg. */ 1743 return -EINTR; 1744 } 1745 1746 return ret; 1747 } 1748 1749 static int ip_set_ad(struct net *net, struct sock *ctnl, 1750 struct sk_buff *skb, 1751 enum ipset_adt adt, 1752 const struct nlmsghdr *nlh, 1753 const struct nlattr * const attr[], 1754 struct netlink_ext_ack *extack) 1755 { 1756 struct ip_set_net *inst = ip_set_pernet(net); 1757 struct ip_set *set; 1758 struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; 1759 const struct nlattr *nla; 1760 u32 flags = flag_exist(nlh); 1761 bool use_lineno; 1762 int ret = 0; 1763 1764 if (unlikely(protocol_min_failed(attr) || 1765 !attr[IPSET_ATTR_SETNAME] || 1766 !((attr[IPSET_ATTR_DATA] != NULL) ^ 1767 (attr[IPSET_ATTR_ADT] != NULL)) || 1768 (attr[IPSET_ATTR_DATA] && 1769 !flag_nested(attr[IPSET_ATTR_DATA])) || 1770 (attr[IPSET_ATTR_ADT] && 1771 (!flag_nested(attr[IPSET_ATTR_ADT]) || 1772 !attr[IPSET_ATTR_LINENO])))) 1773 return -IPSET_ERR_PROTOCOL; 1774 1775 set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1776 if (!set) 1777 return -ENOENT; 1778 1779 use_lineno = !!attr[IPSET_ATTR_LINENO]; 1780 if (attr[IPSET_ATTR_DATA]) { 1781 if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, 1782 attr[IPSET_ATTR_DATA], 1783 set->type->adt_policy, NULL)) 1784 return -IPSET_ERR_PROTOCOL; 1785 ret = call_ad(net, ctnl, skb, set, tb, adt, flags, 1786 use_lineno); 1787 } else { 1788 int nla_rem; 1789 1790 nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { 1791 if (nla_type(nla) != IPSET_ATTR_DATA || 1792 !flag_nested(nla) || 1793 nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, 1794 set->type->adt_policy, NULL)) 1795 return -IPSET_ERR_PROTOCOL; 1796 ret = call_ad(net, ctnl, skb, set, tb, adt, 1797 flags, use_lineno); 1798 if (ret < 0) 1799 return ret; 1800 } 1801 } 1802 return ret; 1803 } 1804 1805 static int ip_set_uadd(struct sk_buff *skb, const struct nfnl_info *info, 1806 const struct nlattr * const attr[]) 1807 { 1808 return ip_set_ad(info->net, info->sk, skb, 1809 IPSET_ADD, info->nlh, attr, info->extack); 1810 } 1811 1812 static int ip_set_udel(struct sk_buff *skb, const struct nfnl_info *info, 1813 const struct nlattr * const attr[]) 1814 { 1815 return ip_set_ad(info->net, info->sk, skb, 1816 IPSET_DEL, info->nlh, attr, info->extack); 1817 } 1818 1819 static int ip_set_utest(struct sk_buff *skb, const struct nfnl_info *info, 1820 const struct nlattr * const attr[]) 1821 { 1822 struct ip_set_net *inst = ip_set_pernet(info->net); 1823 struct ip_set *set; 1824 struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; 1825 int ret = 0; 1826 u32 lineno; 1827 1828 if (unlikely(protocol_min_failed(attr) || 1829 !attr[IPSET_ATTR_SETNAME] || 1830 !attr[IPSET_ATTR_DATA] || 1831 !flag_nested(attr[IPSET_ATTR_DATA]))) 1832 return -IPSET_ERR_PROTOCOL; 1833 1834 set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1835 if (!set) 1836 return -ENOENT; 1837 1838 if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA], 1839 set->type->adt_policy, NULL)) 1840 return -IPSET_ERR_PROTOCOL; 1841 1842 rcu_read_lock_bh(); 1843 ret = set->variant->uadt(set, tb, IPSET_TEST, &lineno, 0, 0); 1844 rcu_read_unlock_bh(); 1845 /* Userspace can't trigger element to be re-added */ 1846 if (ret == -EAGAIN) 1847 ret = 1; 1848 1849 return ret > 0 ? 0 : -IPSET_ERR_EXIST; 1850 } 1851 1852 /* Get headed data of a set */ 1853 1854 static int ip_set_header(struct sk_buff *skb, const struct nfnl_info *info, 1855 const struct nlattr * const attr[]) 1856 { 1857 struct ip_set_net *inst = ip_set_pernet(info->net); 1858 const struct ip_set *set; 1859 struct sk_buff *skb2; 1860 struct nlmsghdr *nlh2; 1861 1862 if (unlikely(protocol_min_failed(attr) || 1863 !attr[IPSET_ATTR_SETNAME])) 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 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1871 if (!skb2) 1872 return -ENOMEM; 1873 1874 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, info->nlh->nlmsg_seq, 0, 1875 IPSET_CMD_HEADER); 1876 if (!nlh2) 1877 goto nlmsg_failure; 1878 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) || 1879 nla_put_string(skb2, IPSET_ATTR_SETNAME, set->name) || 1880 nla_put_string(skb2, IPSET_ATTR_TYPENAME, set->type->name) || 1881 nla_put_u8(skb2, IPSET_ATTR_FAMILY, set->family) || 1882 nla_put_u8(skb2, IPSET_ATTR_REVISION, set->revision)) 1883 goto nla_put_failure; 1884 nlmsg_end(skb2, nlh2); 1885 1886 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid); 1887 1888 nla_put_failure: 1889 nlmsg_cancel(skb2, nlh2); 1890 nlmsg_failure: 1891 kfree_skb(skb2); 1892 return -EMSGSIZE; 1893 } 1894 1895 /* Get type data */ 1896 1897 static const struct nla_policy ip_set_type_policy[IPSET_ATTR_CMD_MAX + 1] = { 1898 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1899 [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, 1900 .len = IPSET_MAXNAMELEN - 1 }, 1901 [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, 1902 }; 1903 1904 static int ip_set_type(struct sk_buff *skb, const struct nfnl_info *info, 1905 const struct nlattr * const attr[]) 1906 { 1907 struct sk_buff *skb2; 1908 struct nlmsghdr *nlh2; 1909 u8 family, min, max; 1910 const char *typename; 1911 int ret = 0; 1912 1913 if (unlikely(protocol_min_failed(attr) || 1914 !attr[IPSET_ATTR_TYPENAME] || 1915 !attr[IPSET_ATTR_FAMILY])) 1916 return -IPSET_ERR_PROTOCOL; 1917 1918 family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); 1919 typename = nla_data(attr[IPSET_ATTR_TYPENAME]); 1920 ret = find_set_type_minmax(typename, family, &min, &max); 1921 if (ret) 1922 return ret; 1923 1924 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1925 if (!skb2) 1926 return -ENOMEM; 1927 1928 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, info->nlh->nlmsg_seq, 0, 1929 IPSET_CMD_TYPE); 1930 if (!nlh2) 1931 goto nlmsg_failure; 1932 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) || 1933 nla_put_string(skb2, IPSET_ATTR_TYPENAME, typename) || 1934 nla_put_u8(skb2, IPSET_ATTR_FAMILY, family) || 1935 nla_put_u8(skb2, IPSET_ATTR_REVISION, max) || 1936 nla_put_u8(skb2, IPSET_ATTR_REVISION_MIN, min)) 1937 goto nla_put_failure; 1938 nlmsg_end(skb2, nlh2); 1939 1940 pr_debug("Send TYPE, nlmsg_len: %u\n", nlh2->nlmsg_len); 1941 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid); 1942 1943 nla_put_failure: 1944 nlmsg_cancel(skb2, nlh2); 1945 nlmsg_failure: 1946 kfree_skb(skb2); 1947 return -EMSGSIZE; 1948 } 1949 1950 /* Get protocol version */ 1951 1952 static const struct nla_policy 1953 ip_set_protocol_policy[IPSET_ATTR_CMD_MAX + 1] = { 1954 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1955 }; 1956 1957 static int ip_set_protocol(struct sk_buff *skb, const struct nfnl_info *info, 1958 const struct nlattr * const attr[]) 1959 { 1960 struct sk_buff *skb2; 1961 struct nlmsghdr *nlh2; 1962 1963 if (unlikely(!attr[IPSET_ATTR_PROTOCOL])) 1964 return -IPSET_ERR_PROTOCOL; 1965 1966 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1967 if (!skb2) 1968 return -ENOMEM; 1969 1970 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, info->nlh->nlmsg_seq, 0, 1971 IPSET_CMD_PROTOCOL); 1972 if (!nlh2) 1973 goto nlmsg_failure; 1974 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL)) 1975 goto nla_put_failure; 1976 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL_MIN, IPSET_PROTOCOL_MIN)) 1977 goto nla_put_failure; 1978 nlmsg_end(skb2, nlh2); 1979 1980 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid); 1981 1982 nla_put_failure: 1983 nlmsg_cancel(skb2, nlh2); 1984 nlmsg_failure: 1985 kfree_skb(skb2); 1986 return -EMSGSIZE; 1987 } 1988 1989 /* Get set by name or index, from userspace */ 1990 1991 static int ip_set_byname(struct sk_buff *skb, const struct nfnl_info *info, 1992 const struct nlattr * const attr[]) 1993 { 1994 struct ip_set_net *inst = ip_set_pernet(info->net); 1995 struct sk_buff *skb2; 1996 struct nlmsghdr *nlh2; 1997 ip_set_id_t id = IPSET_INVALID_ID; 1998 const struct ip_set *set; 1999 2000 if (unlikely(protocol_failed(attr) || 2001 !attr[IPSET_ATTR_SETNAME])) 2002 return -IPSET_ERR_PROTOCOL; 2003 2004 set = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), &id); 2005 if (id == IPSET_INVALID_ID) 2006 return -ENOENT; 2007 2008 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2009 if (!skb2) 2010 return -ENOMEM; 2011 2012 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, info->nlh->nlmsg_seq, 0, 2013 IPSET_CMD_GET_BYNAME); 2014 if (!nlh2) 2015 goto nlmsg_failure; 2016 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) || 2017 nla_put_u8(skb2, IPSET_ATTR_FAMILY, set->family) || 2018 nla_put_net16(skb2, IPSET_ATTR_INDEX, htons(id))) 2019 goto nla_put_failure; 2020 nlmsg_end(skb2, nlh2); 2021 2022 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid); 2023 2024 nla_put_failure: 2025 nlmsg_cancel(skb2, nlh2); 2026 nlmsg_failure: 2027 kfree_skb(skb2); 2028 return -EMSGSIZE; 2029 } 2030 2031 static const struct nla_policy ip_set_index_policy[IPSET_ATTR_CMD_MAX + 1] = { 2032 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 2033 [IPSET_ATTR_INDEX] = { .type = NLA_U16 }, 2034 }; 2035 2036 static int ip_set_byindex(struct sk_buff *skb, const struct nfnl_info *info, 2037 const struct nlattr * const attr[]) 2038 { 2039 struct ip_set_net *inst = ip_set_pernet(info->net); 2040 struct sk_buff *skb2; 2041 struct nlmsghdr *nlh2; 2042 ip_set_id_t id = IPSET_INVALID_ID; 2043 const struct ip_set *set; 2044 2045 if (unlikely(protocol_failed(attr) || 2046 !attr[IPSET_ATTR_INDEX])) 2047 return -IPSET_ERR_PROTOCOL; 2048 2049 id = ip_set_get_h16(attr[IPSET_ATTR_INDEX]); 2050 if (id >= inst->ip_set_max) 2051 return -ENOENT; 2052 set = ip_set(inst, id); 2053 if (set == NULL) 2054 return -ENOENT; 2055 2056 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2057 if (!skb2) 2058 return -ENOMEM; 2059 2060 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, info->nlh->nlmsg_seq, 0, 2061 IPSET_CMD_GET_BYINDEX); 2062 if (!nlh2) 2063 goto nlmsg_failure; 2064 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) || 2065 nla_put_string(skb2, IPSET_ATTR_SETNAME, set->name)) 2066 goto nla_put_failure; 2067 nlmsg_end(skb2, nlh2); 2068 2069 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid); 2070 2071 nla_put_failure: 2072 nlmsg_cancel(skb2, nlh2); 2073 nlmsg_failure: 2074 kfree_skb(skb2); 2075 return -EMSGSIZE; 2076 } 2077 2078 static const struct nfnl_callback ip_set_netlink_subsys_cb[IPSET_MSG_MAX] = { 2079 [IPSET_CMD_NONE] = { 2080 .call = ip_set_none, 2081 .type = NFNL_CB_MUTEX, 2082 .attr_count = IPSET_ATTR_CMD_MAX, 2083 }, 2084 [IPSET_CMD_CREATE] = { 2085 .call = ip_set_create, 2086 .type = NFNL_CB_MUTEX, 2087 .attr_count = IPSET_ATTR_CMD_MAX, 2088 .policy = ip_set_create_policy, 2089 }, 2090 [IPSET_CMD_DESTROY] = { 2091 .call = ip_set_destroy, 2092 .type = NFNL_CB_MUTEX, 2093 .attr_count = IPSET_ATTR_CMD_MAX, 2094 .policy = ip_set_setname_policy, 2095 }, 2096 [IPSET_CMD_FLUSH] = { 2097 .call = ip_set_flush, 2098 .type = NFNL_CB_MUTEX, 2099 .attr_count = IPSET_ATTR_CMD_MAX, 2100 .policy = ip_set_setname_policy, 2101 }, 2102 [IPSET_CMD_RENAME] = { 2103 .call = ip_set_rename, 2104 .type = NFNL_CB_MUTEX, 2105 .attr_count = IPSET_ATTR_CMD_MAX, 2106 .policy = ip_set_setname2_policy, 2107 }, 2108 [IPSET_CMD_SWAP] = { 2109 .call = ip_set_swap, 2110 .type = NFNL_CB_MUTEX, 2111 .attr_count = IPSET_ATTR_CMD_MAX, 2112 .policy = ip_set_setname2_policy, 2113 }, 2114 [IPSET_CMD_LIST] = { 2115 .call = ip_set_dump, 2116 .type = NFNL_CB_MUTEX, 2117 .attr_count = IPSET_ATTR_CMD_MAX, 2118 .policy = ip_set_dump_policy, 2119 }, 2120 [IPSET_CMD_SAVE] = { 2121 .call = ip_set_dump, 2122 .type = NFNL_CB_MUTEX, 2123 .attr_count = IPSET_ATTR_CMD_MAX, 2124 .policy = ip_set_setname_policy, 2125 }, 2126 [IPSET_CMD_ADD] = { 2127 .call = ip_set_uadd, 2128 .type = NFNL_CB_MUTEX, 2129 .attr_count = IPSET_ATTR_CMD_MAX, 2130 .policy = ip_set_adt_policy, 2131 }, 2132 [IPSET_CMD_DEL] = { 2133 .call = ip_set_udel, 2134 .type = NFNL_CB_MUTEX, 2135 .attr_count = IPSET_ATTR_CMD_MAX, 2136 .policy = ip_set_adt_policy, 2137 }, 2138 [IPSET_CMD_TEST] = { 2139 .call = ip_set_utest, 2140 .type = NFNL_CB_MUTEX, 2141 .attr_count = IPSET_ATTR_CMD_MAX, 2142 .policy = ip_set_adt_policy, 2143 }, 2144 [IPSET_CMD_HEADER] = { 2145 .call = ip_set_header, 2146 .type = NFNL_CB_MUTEX, 2147 .attr_count = IPSET_ATTR_CMD_MAX, 2148 .policy = ip_set_setname_policy, 2149 }, 2150 [IPSET_CMD_TYPE] = { 2151 .call = ip_set_type, 2152 .type = NFNL_CB_MUTEX, 2153 .attr_count = IPSET_ATTR_CMD_MAX, 2154 .policy = ip_set_type_policy, 2155 }, 2156 [IPSET_CMD_PROTOCOL] = { 2157 .call = ip_set_protocol, 2158 .type = NFNL_CB_MUTEX, 2159 .attr_count = IPSET_ATTR_CMD_MAX, 2160 .policy = ip_set_protocol_policy, 2161 }, 2162 [IPSET_CMD_GET_BYNAME] = { 2163 .call = ip_set_byname, 2164 .type = NFNL_CB_MUTEX, 2165 .attr_count = IPSET_ATTR_CMD_MAX, 2166 .policy = ip_set_setname_policy, 2167 }, 2168 [IPSET_CMD_GET_BYINDEX] = { 2169 .call = ip_set_byindex, 2170 .type = NFNL_CB_MUTEX, 2171 .attr_count = IPSET_ATTR_CMD_MAX, 2172 .policy = ip_set_index_policy, 2173 }, 2174 }; 2175 2176 static struct nfnetlink_subsystem ip_set_netlink_subsys __read_mostly = { 2177 .name = "ip_set", 2178 .subsys_id = NFNL_SUBSYS_IPSET, 2179 .cb_count = IPSET_MSG_MAX, 2180 .cb = ip_set_netlink_subsys_cb, 2181 }; 2182 2183 /* Interface to iptables/ip6tables */ 2184 2185 static int 2186 ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len) 2187 { 2188 unsigned int *op; 2189 void *data; 2190 int copylen = *len, ret = 0; 2191 struct net *net = sock_net(sk); 2192 struct ip_set_net *inst = ip_set_pernet(net); 2193 2194 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2195 return -EPERM; 2196 if (optval != SO_IP_SET) 2197 return -EBADF; 2198 if (*len < sizeof(unsigned int)) 2199 return -EINVAL; 2200 2201 data = vmalloc(*len); 2202 if (!data) 2203 return -ENOMEM; 2204 if (copy_from_user(data, user, *len) != 0) { 2205 ret = -EFAULT; 2206 goto done; 2207 } 2208 op = data; 2209 2210 if (*op < IP_SET_OP_VERSION) { 2211 /* Check the version at the beginning of operations */ 2212 struct ip_set_req_version *req_version = data; 2213 2214 if (*len < sizeof(struct ip_set_req_version)) { 2215 ret = -EINVAL; 2216 goto done; 2217 } 2218 2219 if (req_version->version < IPSET_PROTOCOL_MIN) { 2220 ret = -EPROTO; 2221 goto done; 2222 } 2223 } 2224 2225 switch (*op) { 2226 case IP_SET_OP_VERSION: { 2227 struct ip_set_req_version *req_version = data; 2228 2229 if (*len != sizeof(struct ip_set_req_version)) { 2230 ret = -EINVAL; 2231 goto done; 2232 } 2233 2234 req_version->version = IPSET_PROTOCOL; 2235 if (copy_to_user(user, req_version, 2236 sizeof(struct ip_set_req_version))) 2237 ret = -EFAULT; 2238 goto done; 2239 } 2240 case IP_SET_OP_GET_BYNAME: { 2241 struct ip_set_req_get_set *req_get = data; 2242 ip_set_id_t id; 2243 2244 if (*len != sizeof(struct ip_set_req_get_set)) { 2245 ret = -EINVAL; 2246 goto done; 2247 } 2248 req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; 2249 nfnl_lock(NFNL_SUBSYS_IPSET); 2250 find_set_and_id(inst, req_get->set.name, &id); 2251 req_get->set.index = id; 2252 nfnl_unlock(NFNL_SUBSYS_IPSET); 2253 goto copy; 2254 } 2255 case IP_SET_OP_GET_FNAME: { 2256 struct ip_set_req_get_set_family *req_get = data; 2257 ip_set_id_t id; 2258 2259 if (*len != sizeof(struct ip_set_req_get_set_family)) { 2260 ret = -EINVAL; 2261 goto done; 2262 } 2263 req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; 2264 nfnl_lock(NFNL_SUBSYS_IPSET); 2265 find_set_and_id(inst, req_get->set.name, &id); 2266 req_get->set.index = id; 2267 if (id != IPSET_INVALID_ID) 2268 req_get->family = ip_set(inst, id)->family; 2269 nfnl_unlock(NFNL_SUBSYS_IPSET); 2270 goto copy; 2271 } 2272 case IP_SET_OP_GET_BYINDEX: { 2273 struct ip_set_req_get_set *req_get = data; 2274 struct ip_set *set; 2275 2276 if (*len != sizeof(struct ip_set_req_get_set) || 2277 req_get->set.index >= inst->ip_set_max) { 2278 ret = -EINVAL; 2279 goto done; 2280 } 2281 nfnl_lock(NFNL_SUBSYS_IPSET); 2282 set = ip_set(inst, req_get->set.index); 2283 ret = strscpy(req_get->set.name, set ? set->name : "", 2284 IPSET_MAXNAMELEN); 2285 nfnl_unlock(NFNL_SUBSYS_IPSET); 2286 if (ret < 0) 2287 goto done; 2288 goto copy; 2289 } 2290 default: 2291 ret = -EBADMSG; 2292 goto done; 2293 } /* end of switch(op) */ 2294 2295 copy: 2296 if (copy_to_user(user, data, copylen)) 2297 ret = -EFAULT; 2298 2299 done: 2300 vfree(data); 2301 if (ret > 0) 2302 ret = 0; 2303 return ret; 2304 } 2305 2306 static struct nf_sockopt_ops so_set __read_mostly = { 2307 .pf = PF_INET, 2308 .get_optmin = SO_IP_SET, 2309 .get_optmax = SO_IP_SET + 1, 2310 .get = ip_set_sockfn_get, 2311 .owner = THIS_MODULE, 2312 }; 2313 2314 static int __net_init 2315 ip_set_net_init(struct net *net) 2316 { 2317 struct ip_set_net *inst = ip_set_pernet(net); 2318 struct ip_set **list; 2319 2320 inst->ip_set_max = max_sets ? max_sets : CONFIG_IP_SET_MAX; 2321 if (inst->ip_set_max >= IPSET_INVALID_ID) 2322 inst->ip_set_max = IPSET_INVALID_ID - 1; 2323 2324 list = kvcalloc(inst->ip_set_max, sizeof(struct ip_set *), GFP_KERNEL); 2325 if (!list) 2326 return -ENOMEM; 2327 inst->is_deleted = false; 2328 inst->is_destroyed = false; 2329 rcu_assign_pointer(inst->ip_set_list, list); 2330 return 0; 2331 } 2332 2333 static void __net_exit 2334 ip_set_net_exit(struct net *net) 2335 { 2336 struct ip_set_net *inst = ip_set_pernet(net); 2337 2338 struct ip_set *set = NULL; 2339 ip_set_id_t i; 2340 2341 inst->is_deleted = true; /* flag for ip_set_nfnl_put */ 2342 2343 nfnl_lock(NFNL_SUBSYS_IPSET); 2344 for (i = 0; i < inst->ip_set_max; i++) { 2345 set = ip_set(inst, i); 2346 if (set) { 2347 ip_set(inst, i) = NULL; 2348 ip_set_destroy_set(set); 2349 } 2350 } 2351 nfnl_unlock(NFNL_SUBSYS_IPSET); 2352 kvfree(rcu_dereference_protected(inst->ip_set_list, 1)); 2353 } 2354 2355 static struct pernet_operations ip_set_net_ops = { 2356 .init = ip_set_net_init, 2357 .exit = ip_set_net_exit, 2358 .id = &ip_set_net_id, 2359 .size = sizeof(struct ip_set_net), 2360 }; 2361 2362 static int __init 2363 ip_set_init(void) 2364 { 2365 int ret = register_pernet_subsys(&ip_set_net_ops); 2366 2367 if (ret) { 2368 pr_err("ip_set: cannot register pernet_subsys.\n"); 2369 return ret; 2370 } 2371 2372 ret = nfnetlink_subsys_register(&ip_set_netlink_subsys); 2373 if (ret != 0) { 2374 pr_err("ip_set: cannot register with nfnetlink.\n"); 2375 unregister_pernet_subsys(&ip_set_net_ops); 2376 return ret; 2377 } 2378 2379 ret = nf_register_sockopt(&so_set); 2380 if (ret != 0) { 2381 pr_err("SO_SET registry failed: %d\n", ret); 2382 nfnetlink_subsys_unregister(&ip_set_netlink_subsys); 2383 unregister_pernet_subsys(&ip_set_net_ops); 2384 return ret; 2385 } 2386 2387 return 0; 2388 } 2389 2390 static void __exit 2391 ip_set_fini(void) 2392 { 2393 nf_unregister_sockopt(&so_set); 2394 nfnetlink_subsys_unregister(&ip_set_netlink_subsys); 2395 2396 unregister_pernet_subsys(&ip_set_net_ops); 2397 pr_debug("these are the famous last words\n"); 2398 } 2399 2400 module_init(ip_set_init); 2401 module_exit(ip_set_fini); 2402 2403 MODULE_DESCRIPTION("ip_set: protocol " __stringify(IPSET_PROTOCOL)); 2404