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 25static LIST_HEAD(ip_set_type_list); /* all registered set types */ 26static DEFINE_MUTEX(ip_set_type_mutex); /* protects ip_set_type_list */ 27static DEFINE_RWLOCK(ip_set_ref_lock); /* protects the set refs */ 28 29struct 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 36static unsigned int ip_set_net_id __read_mostly; 37 38static 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 46static unsigned int max_sets; 47 48module_param(max_sets, int, 0600); 49MODULE_PARM_DESC(max_sets, "maximal number of sets"); 50MODULE_LICENSE("GPL"); 51MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>"); 52MODULE_DESCRIPTION("core IP set support"); 53MODULE_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#define ip_set_dereference_nfnl(p) \ 65 rcu_dereference_check(p, lockdep_nfnl_is_held(NFNL_SUBSYS_IPSET)) 66 67/* The set types are implemented in modules and registered set types 68 * can be found in ip_set_type_list. Adding/deleting types is 69 * serialized by ip_set_type_mutex. 70 */ 71 72static void 73ip_set_type_lock(void) 74{ 75 mutex_lock(&ip_set_type_mutex); 76} 77 78static void 79ip_set_type_unlock(void) 80{ 81 mutex_unlock(&ip_set_type_mutex); 82} 83 84/* Register and deregister settype */ 85 86static struct ip_set_type * 87find_set_type(const char *name, u8 family, u8 revision) 88{ 89 struct ip_set_type *type; 90 91 list_for_each_entry_rcu(type, &ip_set_type_list, list, 92 lockdep_is_held(&ip_set_type_mutex)) 93 if (STRNCMP(type->name, name) && 94 (type->family == family || 95 type->family == NFPROTO_UNSPEC) && 96 revision >= type->revision_min && 97 revision <= type->revision_max) 98 return type; 99 return NULL; 100} 101 102/* Unlock, try to load a set type module and lock again */ 103static bool 104load_settype(const char *name) 105{ 106 nfnl_unlock(NFNL_SUBSYS_IPSET); 107 pr_debug("try to load ip_set_%s\n", name); 108 if (request_module("ip_set_%s", name) < 0) { 109 pr_warn("Can't find ip_set type %s\n", name); 110 nfnl_lock(NFNL_SUBSYS_IPSET); 111 return false; 112 } 113 nfnl_lock(NFNL_SUBSYS_IPSET); 114 return true; 115} 116 117/* Find a set type and reference it */ 118#define find_set_type_get(name, family, revision, found) \ 119 __find_set_type_get(name, family, revision, found, false) 120 121static int 122__find_set_type_get(const char *name, u8 family, u8 revision, 123 struct ip_set_type **found, bool retry) 124{ 125 struct ip_set_type *type; 126 int err; 127 128 if (retry && !load_settype(name)) 129 return -IPSET_ERR_FIND_TYPE; 130 131 rcu_read_lock(); 132 *found = find_set_type(name, family, revision); 133 if (*found) { 134 err = !try_module_get((*found)->me) ? -EFAULT : 0; 135 goto unlock; 136 } 137 /* Make sure the type is already loaded 138 * but we don't support the revision 139 */ 140 list_for_each_entry_rcu(type, &ip_set_type_list, list) 141 if (STRNCMP(type->name, name)) { 142 err = -IPSET_ERR_FIND_TYPE; 143 goto unlock; 144 } 145 rcu_read_unlock(); 146 147 return retry ? -IPSET_ERR_FIND_TYPE : 148 __find_set_type_get(name, family, revision, found, true); 149 150unlock: 151 rcu_read_unlock(); 152 return err; 153} 154 155/* Find a given set type by name and family. 156 * If we succeeded, the supported minimal and maximum revisions are 157 * filled out. 158 */ 159#define find_set_type_minmax(name, family, min, max) \ 160 __find_set_type_minmax(name, family, min, max, false) 161 162static int 163__find_set_type_minmax(const char *name, u8 family, u8 *min, u8 *max, 164 bool retry) 165{ 166 struct ip_set_type *type; 167 bool found = false; 168 169 if (retry && !load_settype(name)) 170 return -IPSET_ERR_FIND_TYPE; 171 172 *min = 255; *max = 0; 173 rcu_read_lock(); 174 list_for_each_entry_rcu(type, &ip_set_type_list, list) 175 if (STRNCMP(type->name, name) && 176 (type->family == family || 177 type->family == NFPROTO_UNSPEC)) { 178 found = true; 179 if (type->revision_min < *min) 180 *min = type->revision_min; 181 if (type->revision_max > *max) 182 *max = type->revision_max; 183 } 184 rcu_read_unlock(); 185 if (found) 186 return 0; 187 188 return retry ? -IPSET_ERR_FIND_TYPE : 189 __find_set_type_minmax(name, family, min, max, true); 190} 191 192#define family_name(f) ((f) == NFPROTO_IPV4 ? "inet" : \ 193 (f) == NFPROTO_IPV6 ? "inet6" : "any") 194 195/* Register a set type structure. The type is identified by 196 * the unique triple of name, family and revision. 197 */ 198int 199ip_set_type_register(struct ip_set_type *type) 200{ 201 int ret = 0; 202 203 if (type->protocol != IPSET_PROTOCOL) { 204 pr_warn("ip_set type %s, family %s, revision %u:%u uses wrong protocol version %u (want %u)\n", 205 type->name, family_name(type->family), 206 type->revision_min, type->revision_max, 207 type->protocol, IPSET_PROTOCOL); 208 return -EINVAL; 209 } 210 211 ip_set_type_lock(); 212 if (find_set_type(type->name, type->family, type->revision_min)) { 213 /* Duplicate! */ 214 pr_warn("ip_set type %s, family %s with revision min %u already registered!\n", 215 type->name, family_name(type->family), 216 type->revision_min); 217 ip_set_type_unlock(); 218 return -EINVAL; 219 } 220 list_add_rcu(&type->list, &ip_set_type_list); 221 pr_debug("type %s, family %s, revision %u:%u registered.\n", 222 type->name, family_name(type->family), 223 type->revision_min, type->revision_max); 224 ip_set_type_unlock(); 225 226 return ret; 227} 228EXPORT_SYMBOL_GPL(ip_set_type_register); 229 230/* Unregister a set type. There's a small race with ip_set_create */ 231void 232ip_set_type_unregister(struct ip_set_type *type) 233{ 234 ip_set_type_lock(); 235 if (!find_set_type(type->name, type->family, type->revision_min)) { 236 pr_warn("ip_set type %s, family %s with revision min %u not registered\n", 237 type->name, family_name(type->family), 238 type->revision_min); 239 ip_set_type_unlock(); 240 return; 241 } 242 list_del_rcu(&type->list); 243 pr_debug("type %s, family %s with revision min %u unregistered.\n", 244 type->name, family_name(type->family), type->revision_min); 245 ip_set_type_unlock(); 246 247 synchronize_rcu(); 248} 249EXPORT_SYMBOL_GPL(ip_set_type_unregister); 250 251/* Utility functions */ 252void * 253ip_set_alloc(size_t size) 254{ 255 return kvzalloc(size, GFP_KERNEL_ACCOUNT); 256} 257EXPORT_SYMBOL_GPL(ip_set_alloc); 258 259void 260ip_set_free(void *members) 261{ 262 pr_debug("%p: free with %s\n", members, 263 is_vmalloc_addr(members) ? "vfree" : "kfree"); 264 kvfree(members); 265} 266EXPORT_SYMBOL_GPL(ip_set_free); 267 268static bool 269flag_nested(const struct nlattr *nla) 270{ 271 return nla->nla_type & NLA_F_NESTED; 272} 273 274static const struct nla_policy ipaddr_policy[IPSET_ATTR_IPADDR_MAX + 1] = { 275 [IPSET_ATTR_IPADDR_IPV4] = { .type = NLA_U32 }, 276 [IPSET_ATTR_IPADDR_IPV6] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)), 277}; 278 279int 280ip_set_get_ipaddr4(struct nlattr *nla, __be32 *ipaddr) 281{ 282 struct nlattr *tb[IPSET_ATTR_IPADDR_MAX + 1]; 283 284 if (unlikely(!flag_nested(nla))) 285 return -IPSET_ERR_PROTOCOL; 286 if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, 287 ipaddr_policy, NULL)) 288 return -IPSET_ERR_PROTOCOL; 289 if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV4))) 290 return -IPSET_ERR_PROTOCOL; 291 292 *ipaddr = nla_get_be32(tb[IPSET_ATTR_IPADDR_IPV4]); 293 return 0; 294} 295EXPORT_SYMBOL_GPL(ip_set_get_ipaddr4); 296 297int 298ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr) 299{ 300 struct nlattr *tb[IPSET_ATTR_IPADDR_MAX + 1]; 301 302 if (unlikely(!flag_nested(nla))) 303 return -IPSET_ERR_PROTOCOL; 304 305 if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla, 306 ipaddr_policy, NULL)) 307 return -IPSET_ERR_PROTOCOL; 308 if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV6))) 309 return -IPSET_ERR_PROTOCOL; 310 311 memcpy(ipaddr, nla_data(tb[IPSET_ATTR_IPADDR_IPV6]), 312 sizeof(struct in6_addr)); 313 return 0; 314} 315EXPORT_SYMBOL_GPL(ip_set_get_ipaddr6); 316 317static u32 318ip_set_timeout_get(const unsigned long *timeout) 319{ 320 u32 t; 321 322 if (*timeout == IPSET_ELEM_PERMANENT) 323 return 0; 324 325 t = jiffies_to_msecs(*timeout - jiffies) / MSEC_PER_SEC; 326 /* Zero value in userspace means no timeout */ 327 return t == 0 ? 1 : t; 328} 329 330static char * 331ip_set_comment_uget(struct nlattr *tb) 332{ 333 return nla_data(tb); 334} 335 336/* Called from uadd only, protected by the set spinlock. 337 * The kadt functions don't use the comment extensions in any way. 338 */ 339void 340ip_set_init_comment(struct ip_set *set, struct ip_set_comment *comment, 341 const struct ip_set_ext *ext) 342{ 343 struct ip_set_comment_rcu *c = rcu_dereference_protected(comment->c, 1); 344 size_t len = ext->comment ? strlen(ext->comment) : 0; 345 346 if (unlikely(c)) { 347 set->ext_size -= sizeof(*c) + strlen(c->str) + 1; 348 kfree_rcu(c, rcu); 349 rcu_assign_pointer(comment->c, NULL); 350 } 351 if (!len) 352 return; 353 if (unlikely(len > IPSET_MAX_COMMENT_SIZE)) 354 len = IPSET_MAX_COMMENT_SIZE; 355 c = kmalloc(sizeof(*c) + len + 1, GFP_ATOMIC); 356 if (unlikely(!c)) 357 return; 358 strscpy(c->str, ext->comment, len + 1); 359 set->ext_size += sizeof(*c) + strlen(c->str) + 1; 360 rcu_assign_pointer(comment->c, c); 361} 362EXPORT_SYMBOL_GPL(ip_set_init_comment); 363 364/* Used only when dumping a set, protected by rcu_read_lock() */ 365static int 366ip_set_put_comment(struct sk_buff *skb, const struct ip_set_comment *comment) 367{ 368 struct ip_set_comment_rcu *c = rcu_dereference(comment->c); 369 370 if (!c) 371 return 0; 372 return nla_put_string(skb, IPSET_ATTR_COMMENT, c->str); 373} 374 375/* Called from uadd/udel, flush or the garbage collectors protected 376 * by the set spinlock. 377 * Called when the set is destroyed and when there can't be any user 378 * of the set data anymore. 379 */ 380static void 381ip_set_comment_free(struct ip_set *set, void *ptr) 382{ 383 struct ip_set_comment *comment = ptr; 384 struct ip_set_comment_rcu *c; 385 386 c = rcu_dereference_protected(comment->c, 1); 387 if (unlikely(!c)) 388 return; 389 set->ext_size -= sizeof(*c) + strlen(c->str) + 1; 390 kfree_rcu(c, rcu); 391 rcu_assign_pointer(comment->c, NULL); 392} 393 394typedef void (*destroyer)(struct ip_set *, void *); 395/* ipset data extension types, in size order */ 396 397const struct ip_set_ext_type ip_set_extensions[] = { 398 [IPSET_EXT_ID_COUNTER] = { 399 .type = IPSET_EXT_COUNTER, 400 .flag = IPSET_FLAG_WITH_COUNTERS, 401 .len = sizeof(struct ip_set_counter), 402 .align = __alignof__(struct ip_set_counter), 403 }, 404 [IPSET_EXT_ID_TIMEOUT] = { 405 .type = IPSET_EXT_TIMEOUT, 406 .len = sizeof(unsigned long), 407 .align = __alignof__(unsigned long), 408 }, 409 [IPSET_EXT_ID_SKBINFO] = { 410 .type = IPSET_EXT_SKBINFO, 411 .flag = IPSET_FLAG_WITH_SKBINFO, 412 .len = sizeof(struct ip_set_skbinfo), 413 .align = __alignof__(struct ip_set_skbinfo), 414 }, 415 [IPSET_EXT_ID_COMMENT] = { 416 .type = IPSET_EXT_COMMENT | IPSET_EXT_DESTROY, 417 .flag = IPSET_FLAG_WITH_COMMENT, 418 .len = sizeof(struct ip_set_comment), 419 .align = __alignof__(struct ip_set_comment), 420 .destroy = ip_set_comment_free, 421 }, 422}; 423EXPORT_SYMBOL_GPL(ip_set_extensions); 424 425static bool 426add_extension(enum ip_set_ext_id id, u32 flags, struct nlattr *tb[]) 427{ 428 return ip_set_extensions[id].flag ? 429 (flags & ip_set_extensions[id].flag) : 430 !!tb[IPSET_ATTR_TIMEOUT]; 431} 432 433size_t 434ip_set_elem_len(struct ip_set *set, struct nlattr *tb[], size_t len, 435 size_t align) 436{ 437 enum ip_set_ext_id id; 438 u32 cadt_flags = 0; 439 440 if (tb[IPSET_ATTR_CADT_FLAGS]) 441 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); 442 if (cadt_flags & IPSET_FLAG_WITH_FORCEADD) 443 set->flags |= IPSET_CREATE_FLAG_FORCEADD; 444 if (!align) 445 align = 1; 446 for (id = 0; id < IPSET_EXT_ID_MAX; id++) { 447 if (!add_extension(id, cadt_flags, tb)) 448 continue; 449 if (align < ip_set_extensions[id].align) 450 align = ip_set_extensions[id].align; 451 len = ALIGN(len, ip_set_extensions[id].align); 452 set->offset[id] = len; 453 set->extensions |= ip_set_extensions[id].type; 454 len += ip_set_extensions[id].len; 455 } 456 return ALIGN(len, align); 457} 458EXPORT_SYMBOL_GPL(ip_set_elem_len); 459 460int 461ip_set_get_extensions(struct ip_set *set, struct nlattr *tb[], 462 struct ip_set_ext *ext) 463{ 464 u64 fullmark; 465 466 if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || 467 !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || 468 !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) || 469 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) || 470 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) || 471 !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE))) 472 return -IPSET_ERR_PROTOCOL; 473 474 if (tb[IPSET_ATTR_TIMEOUT]) { 475 if (!SET_WITH_TIMEOUT(set)) 476 return -IPSET_ERR_TIMEOUT; 477 ext->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); 478 } 479 if (tb[IPSET_ATTR_BYTES] || tb[IPSET_ATTR_PACKETS]) { 480 if (!SET_WITH_COUNTER(set)) 481 return -IPSET_ERR_COUNTER; 482 if (tb[IPSET_ATTR_BYTES]) 483 ext->bytes = be64_to_cpu(nla_get_be64( 484 tb[IPSET_ATTR_BYTES])); 485 if (tb[IPSET_ATTR_PACKETS]) 486 ext->packets = be64_to_cpu(nla_get_be64( 487 tb[IPSET_ATTR_PACKETS])); 488 } 489 if (tb[IPSET_ATTR_COMMENT]) { 490 if (!SET_WITH_COMMENT(set)) 491 return -IPSET_ERR_COMMENT; 492 ext->comment = ip_set_comment_uget(tb[IPSET_ATTR_COMMENT]); 493 } 494 if (tb[IPSET_ATTR_SKBMARK]) { 495 if (!SET_WITH_SKBINFO(set)) 496 return -IPSET_ERR_SKBINFO; 497 fullmark = be64_to_cpu(nla_get_be64(tb[IPSET_ATTR_SKBMARK])); 498 ext->skbinfo.skbmark = fullmark >> 32; 499 ext->skbinfo.skbmarkmask = fullmark & 0xffffffff; 500 } 501 if (tb[IPSET_ATTR_SKBPRIO]) { 502 if (!SET_WITH_SKBINFO(set)) 503 return -IPSET_ERR_SKBINFO; 504 ext->skbinfo.skbprio = 505 be32_to_cpu(nla_get_be32(tb[IPSET_ATTR_SKBPRIO])); 506 } 507 if (tb[IPSET_ATTR_SKBQUEUE]) { 508 if (!SET_WITH_SKBINFO(set)) 509 return -IPSET_ERR_SKBINFO; 510 ext->skbinfo.skbqueue = 511 be16_to_cpu(nla_get_be16(tb[IPSET_ATTR_SKBQUEUE])); 512 } 513 return 0; 514} 515EXPORT_SYMBOL_GPL(ip_set_get_extensions); 516 517static u64 518ip_set_get_bytes(const struct ip_set_counter *counter) 519{ 520 return (u64)atomic64_read(&(counter)->bytes); 521} 522 523static u64 524ip_set_get_packets(const struct ip_set_counter *counter) 525{ 526 return (u64)atomic64_read(&(counter)->packets); 527} 528 529static bool 530ip_set_put_counter(struct sk_buff *skb, const struct ip_set_counter *counter) 531{ 532 return nla_put_net64(skb, IPSET_ATTR_BYTES, 533 cpu_to_be64(ip_set_get_bytes(counter)), 534 IPSET_ATTR_PAD) || 535 nla_put_net64(skb, IPSET_ATTR_PACKETS, 536 cpu_to_be64(ip_set_get_packets(counter)), 537 IPSET_ATTR_PAD); 538} 539 540static bool 541ip_set_put_skbinfo(struct sk_buff *skb, const struct ip_set_skbinfo *skbinfo) 542{ 543 /* Send nonzero parameters only */ 544 return ((skbinfo->skbmark || skbinfo->skbmarkmask) && 545 nla_put_net64(skb, IPSET_ATTR_SKBMARK, 546 cpu_to_be64((u64)skbinfo->skbmark << 32 | 547 skbinfo->skbmarkmask), 548 IPSET_ATTR_PAD)) || 549 (skbinfo->skbprio && 550 nla_put_net32(skb, IPSET_ATTR_SKBPRIO, 551 cpu_to_be32(skbinfo->skbprio))) || 552 (skbinfo->skbqueue && 553 nla_put_net16(skb, IPSET_ATTR_SKBQUEUE, 554 cpu_to_be16(skbinfo->skbqueue))); 555} 556 557int 558ip_set_put_extensions(struct sk_buff *skb, const struct ip_set *set, 559 const void *e, bool active) 560{ 561 if (SET_WITH_TIMEOUT(set)) { 562 unsigned long *timeout = ext_timeout(e, set); 563 564 if (nla_put_net32(skb, IPSET_ATTR_TIMEOUT, 565 htonl(active ? ip_set_timeout_get(timeout) 566 : *timeout))) 567 return -EMSGSIZE; 568 } 569 if (SET_WITH_COUNTER(set) && 570 ip_set_put_counter(skb, ext_counter(e, set))) 571 return -EMSGSIZE; 572 if (SET_WITH_COMMENT(set) && 573 ip_set_put_comment(skb, ext_comment(e, set))) 574 return -EMSGSIZE; 575 if (SET_WITH_SKBINFO(set) && 576 ip_set_put_skbinfo(skb, ext_skbinfo(e, set))) 577 return -EMSGSIZE; 578 return 0; 579} 580EXPORT_SYMBOL_GPL(ip_set_put_extensions); 581 582static bool 583ip_set_match_counter(u64 counter, u64 match, u8 op) 584{ 585 switch (op) { 586 case IPSET_COUNTER_NONE: 587 return true; 588 case IPSET_COUNTER_EQ: 589 return counter == match; 590 case IPSET_COUNTER_NE: 591 return counter != match; 592 case IPSET_COUNTER_LT: 593 return counter < match; 594 case IPSET_COUNTER_GT: 595 return counter > match; 596 } 597 return false; 598} 599 600static void 601ip_set_add_bytes(u64 bytes, struct ip_set_counter *counter) 602{ 603 atomic64_add((long long)bytes, &(counter)->bytes); 604} 605 606static void 607ip_set_add_packets(u64 packets, struct ip_set_counter *counter) 608{ 609 atomic64_add((long long)packets, &(counter)->packets); 610} 611 612static void 613ip_set_update_counter(struct ip_set_counter *counter, 614 const struct ip_set_ext *ext, u32 flags) 615{ 616 if (ext->packets != ULLONG_MAX && 617 !(flags & IPSET_FLAG_SKIP_COUNTER_UPDATE)) { 618 ip_set_add_bytes(ext->bytes, counter); 619 ip_set_add_packets(ext->packets, counter); 620 } 621} 622 623static void 624ip_set_get_skbinfo(struct ip_set_skbinfo *skbinfo, 625 const struct ip_set_ext *ext, 626 struct ip_set_ext *mext, u32 flags) 627{ 628 mext->skbinfo = *skbinfo; 629} 630 631bool 632ip_set_match_extensions(struct ip_set *set, const struct ip_set_ext *ext, 633 struct ip_set_ext *mext, u32 flags, void *data) 634{ 635 if (SET_WITH_TIMEOUT(set) && 636 ip_set_timeout_expired(ext_timeout(data, set))) 637 return false; 638 if (SET_WITH_COUNTER(set)) { 639 struct ip_set_counter *counter = ext_counter(data, set); 640 641 ip_set_update_counter(counter, ext, flags); 642 643 if (flags & IPSET_FLAG_MATCH_COUNTERS && 644 !(ip_set_match_counter(ip_set_get_packets(counter), 645 mext->packets, mext->packets_op) && 646 ip_set_match_counter(ip_set_get_bytes(counter), 647 mext->bytes, mext->bytes_op))) 648 return false; 649 } 650 if (SET_WITH_SKBINFO(set)) 651 ip_set_get_skbinfo(ext_skbinfo(data, set), 652 ext, mext, flags); 653 return true; 654} 655EXPORT_SYMBOL_GPL(ip_set_match_extensions); 656 657/* Creating/destroying/renaming/swapping affect the existence and 658 * the properties of a set. All of these can be executed from userspace 659 * only and serialized by the nfnl mutex indirectly from nfnetlink. 660 * 661 * Sets are identified by their index in ip_set_list and the index 662 * is used by the external references (set/SET netfilter modules). 663 * 664 * The set behind an index may change by swapping only, from userspace. 665 */ 666 667static void 668__ip_set_get(struct ip_set *set) 669{ 670 write_lock_bh(&ip_set_ref_lock); 671 set->ref++; 672 write_unlock_bh(&ip_set_ref_lock); 673} 674 675static void 676__ip_set_put(struct ip_set *set) 677{ 678 write_lock_bh(&ip_set_ref_lock); 679 BUG_ON(set->ref == 0); 680 set->ref--; 681 write_unlock_bh(&ip_set_ref_lock); 682} 683 684/* set->ref can be swapped out by ip_set_swap, netlink events (like dump) need 685 * a separate reference counter 686 */ 687static void 688__ip_set_get_netlink(struct ip_set *set) 689{ 690 write_lock_bh(&ip_set_ref_lock); 691 set->ref_netlink++; 692 write_unlock_bh(&ip_set_ref_lock); 693} 694 695static void 696__ip_set_put_netlink(struct ip_set *set) 697{ 698 write_lock_bh(&ip_set_ref_lock); 699 BUG_ON(set->ref_netlink == 0); 700 set->ref_netlink--; 701 write_unlock_bh(&ip_set_ref_lock); 702} 703 704/* Add, del and test set entries from kernel. 705 * 706 * The set behind the index must exist and must be referenced 707 * so it can't be destroyed (or changed) under our foot. 708 */ 709 710static struct ip_set * 711ip_set_rcu_get(struct net *net, ip_set_id_t index) 712{ 713 struct ip_set_net *inst = ip_set_pernet(net); 714 715 /* ip_set_list and the set pointer need to be protected */ 716 return ip_set_dereference_nfnl(inst->ip_set_list)[index]; 717} 718 719static inline void 720ip_set_lock(struct ip_set *set) 721{ 722 if (!set->variant->region_lock) 723 spin_lock_bh(&set->lock); 724} 725 726static inline void 727ip_set_unlock(struct ip_set *set) 728{ 729 if (!set->variant->region_lock) 730 spin_unlock_bh(&set->lock); 731} 732 733int 734ip_set_test(ip_set_id_t index, const struct sk_buff *skb, 735 const struct xt_action_param *par, struct ip_set_adt_opt *opt) 736{ 737 struct ip_set *set = ip_set_rcu_get(xt_net(par), index); 738 int ret = 0; 739 740 BUG_ON(!set); 741 pr_debug("set %s, index %u\n", set->name, index); 742 743 if (opt->dim < set->type->dimension || 744 !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) 745 return 0; 746 747 ret = set->variant->kadt(set, skb, par, IPSET_TEST, opt); 748 749 if (ret == -EAGAIN) { 750 /* Type requests element to be completed */ 751 pr_debug("element must be completed, ADD is triggered\n"); 752 ip_set_lock(set); 753 set->variant->kadt(set, skb, par, IPSET_ADD, opt); 754 ip_set_unlock(set); 755 ret = 1; 756 } else { 757 /* --return-nomatch: invert matched element */ 758 if ((opt->cmdflags & IPSET_FLAG_RETURN_NOMATCH) && 759 (set->type->features & IPSET_TYPE_NOMATCH) && 760 (ret > 0 || ret == -ENOTEMPTY)) 761 ret = -ret; 762 } 763 764 /* Convert error codes to nomatch */ 765 return (ret < 0 ? 0 : ret); 766} 767EXPORT_SYMBOL_GPL(ip_set_test); 768 769int 770ip_set_add(ip_set_id_t index, const struct sk_buff *skb, 771 const struct xt_action_param *par, struct ip_set_adt_opt *opt) 772{ 773 struct ip_set *set = ip_set_rcu_get(xt_net(par), index); 774 int ret; 775 776 BUG_ON(!set); 777 pr_debug("set %s, index %u\n", set->name, index); 778 779 if (opt->dim < set->type->dimension || 780 !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) 781 return -IPSET_ERR_TYPE_MISMATCH; 782 783 ip_set_lock(set); 784 ret = set->variant->kadt(set, skb, par, IPSET_ADD, opt); 785 ip_set_unlock(set); 786 787 return ret; 788} 789EXPORT_SYMBOL_GPL(ip_set_add); 790 791int 792ip_set_del(ip_set_id_t index, const struct sk_buff *skb, 793 const struct xt_action_param *par, struct ip_set_adt_opt *opt) 794{ 795 struct ip_set *set = ip_set_rcu_get(xt_net(par), index); 796 int ret = 0; 797 798 BUG_ON(!set); 799 pr_debug("set %s, index %u\n", set->name, index); 800 801 if (opt->dim < set->type->dimension || 802 !(opt->family == set->family || set->family == NFPROTO_UNSPEC)) 803 return -IPSET_ERR_TYPE_MISMATCH; 804 805 ip_set_lock(set); 806 ret = set->variant->kadt(set, skb, par, IPSET_DEL, opt); 807 ip_set_unlock(set); 808 809 return ret; 810} 811EXPORT_SYMBOL_GPL(ip_set_del); 812 813/* Find set by name, reference it once. The reference makes sure the 814 * thing pointed to, does not go away under our feet. 815 * 816 */ 817ip_set_id_t 818ip_set_get_byname(struct net *net, const char *name, struct ip_set **set) 819{ 820 ip_set_id_t i, index = IPSET_INVALID_ID; 821 struct ip_set *s; 822 struct ip_set_net *inst = ip_set_pernet(net); 823 824 rcu_read_lock(); 825 for (i = 0; i < inst->ip_set_max; i++) { 826 s = rcu_dereference(inst->ip_set_list)[i]; 827 if (s && STRNCMP(s->name, name)) { 828 __ip_set_get(s); 829 index = i; 830 *set = s; 831 break; 832 } 833 } 834 rcu_read_unlock(); 835 836 return index; 837} 838EXPORT_SYMBOL_GPL(ip_set_get_byname); 839 840/* If the given set pointer points to a valid set, decrement 841 * reference count by 1. The caller shall not assume the index 842 * to be valid, after calling this function. 843 * 844 */ 845 846static void 847__ip_set_put_byindex(struct ip_set_net *inst, ip_set_id_t index) 848{ 849 struct ip_set *set; 850 851 rcu_read_lock(); 852 set = rcu_dereference(inst->ip_set_list)[index]; 853 if (set) 854 __ip_set_put(set); 855 rcu_read_unlock(); 856} 857 858void 859ip_set_put_byindex(struct net *net, ip_set_id_t index) 860{ 861 struct ip_set_net *inst = ip_set_pernet(net); 862 863 __ip_set_put_byindex(inst, index); 864} 865EXPORT_SYMBOL_GPL(ip_set_put_byindex); 866 867/* Get the name of a set behind a set index. 868 * Set itself is protected by RCU, but its name isn't: to protect against 869 * renaming, grab ip_set_ref_lock as reader (see ip_set_rename()) and copy the 870 * name. 871 */ 872void 873ip_set_name_byindex(struct net *net, ip_set_id_t index, char *name) 874{ 875 struct ip_set *set = ip_set_rcu_get(net, index); 876 877 BUG_ON(!set); 878 879 read_lock_bh(&ip_set_ref_lock); 880 strscpy_pad(name, set->name, IPSET_MAXNAMELEN); 881 read_unlock_bh(&ip_set_ref_lock); 882} 883EXPORT_SYMBOL_GPL(ip_set_name_byindex); 884 885/* Routines to call by external subsystems, which do not 886 * call nfnl_lock for us. 887 */ 888 889/* Find set by index, reference it once. The reference makes sure the 890 * thing pointed to, does not go away under our feet. 891 * 892 * The nfnl mutex is used in the function. 893 */ 894ip_set_id_t 895ip_set_nfnl_get_byindex(struct net *net, ip_set_id_t index) 896{ 897 struct ip_set *set; 898 struct ip_set_net *inst = ip_set_pernet(net); 899 900 if (index >= inst->ip_set_max) 901 return IPSET_INVALID_ID; 902 903 nfnl_lock(NFNL_SUBSYS_IPSET); 904 set = ip_set(inst, index); 905 if (set) 906 __ip_set_get(set); 907 else 908 index = IPSET_INVALID_ID; 909 nfnl_unlock(NFNL_SUBSYS_IPSET); 910 911 return index; 912} 913EXPORT_SYMBOL_GPL(ip_set_nfnl_get_byindex); 914 915/* If the given set pointer points to a valid set, decrement 916 * reference count by 1. The caller shall not assume the index 917 * to be valid, after calling this function. 918 * 919 * The nfnl mutex is used in the function. 920 */ 921void 922ip_set_nfnl_put(struct net *net, ip_set_id_t index) 923{ 924 struct ip_set *set; 925 struct ip_set_net *inst = ip_set_pernet(net); 926 927 nfnl_lock(NFNL_SUBSYS_IPSET); 928 if (!inst->is_deleted) { /* already deleted from ip_set_net_exit() */ 929 set = ip_set(inst, index); 930 if (set) 931 __ip_set_put(set); 932 } 933 nfnl_unlock(NFNL_SUBSYS_IPSET); 934} 935EXPORT_SYMBOL_GPL(ip_set_nfnl_put); 936 937/* Communication protocol with userspace over netlink. 938 * 939 * The commands are serialized by the nfnl mutex. 940 */ 941 942static inline u8 protocol(const struct nlattr * const tb[]) 943{ 944 return nla_get_u8(tb[IPSET_ATTR_PROTOCOL]); 945} 946 947static inline bool 948protocol_failed(const struct nlattr * const tb[]) 949{ 950 return !tb[IPSET_ATTR_PROTOCOL] || protocol(tb) != IPSET_PROTOCOL; 951} 952 953static inline bool 954protocol_min_failed(const struct nlattr * const tb[]) 955{ 956 return !tb[IPSET_ATTR_PROTOCOL] || protocol(tb) < IPSET_PROTOCOL_MIN; 957} 958 959static inline u32 960flag_exist(const struct nlmsghdr *nlh) 961{ 962 return nlh->nlmsg_flags & NLM_F_EXCL ? 0 : IPSET_FLAG_EXIST; 963} 964 965static struct nlmsghdr * 966start_msg(struct sk_buff *skb, u32 portid, u32 seq, unsigned int flags, 967 enum ipset_cmd cmd) 968{ 969 return nfnl_msg_put(skb, portid, seq, 970 nfnl_msg_type(NFNL_SUBSYS_IPSET, cmd), flags, 971 NFPROTO_IPV4, NFNETLINK_V0, 0); 972} 973 974/* Create a set */ 975 976static const struct nla_policy ip_set_create_policy[IPSET_ATTR_CMD_MAX + 1] = { 977 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 978 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 979 .len = IPSET_MAXNAMELEN - 1 }, 980 [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, 981 .len = IPSET_MAXNAMELEN - 1}, 982 [IPSET_ATTR_REVISION] = { .type = NLA_U8 }, 983 [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, 984 [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, 985}; 986 987static struct ip_set * 988find_set_and_id(struct ip_set_net *inst, const char *name, ip_set_id_t *id) 989{ 990 struct ip_set *set = NULL; 991 ip_set_id_t i; 992 993 *id = IPSET_INVALID_ID; 994 for (i = 0; i < inst->ip_set_max; i++) { 995 set = ip_set(inst, i); 996 if (set && STRNCMP(set->name, name)) { 997 *id = i; 998 break; 999 } 1000 } 1001 return (*id == IPSET_INVALID_ID ? NULL : set); 1002} 1003 1004static inline struct ip_set * 1005find_set(struct ip_set_net *inst, const char *name) 1006{ 1007 ip_set_id_t id; 1008 1009 return find_set_and_id(inst, name, &id); 1010} 1011 1012static int 1013find_free_id(struct ip_set_net *inst, const char *name, ip_set_id_t *index, 1014 struct ip_set **set) 1015{ 1016 struct ip_set *s; 1017 ip_set_id_t i; 1018 1019 *index = IPSET_INVALID_ID; 1020 for (i = 0; i < inst->ip_set_max; i++) { 1021 s = ip_set(inst, i); 1022 if (!s) { 1023 if (*index == IPSET_INVALID_ID) 1024 *index = i; 1025 } else if (STRNCMP(name, s->name)) { 1026 /* Name clash */ 1027 *set = s; 1028 return -EEXIST; 1029 } 1030 } 1031 if (*index == IPSET_INVALID_ID) 1032 /* No free slot remained */ 1033 return -IPSET_ERR_MAX_SETS; 1034 return 0; 1035} 1036 1037static int ip_set_none(struct sk_buff *skb, const struct nfnl_info *info, 1038 const struct nlattr * const attr[]) 1039{ 1040 return -EOPNOTSUPP; 1041} 1042 1043static int ip_set_create(struct sk_buff *skb, const struct nfnl_info *info, 1044 const struct nlattr * const attr[]) 1045{ 1046 struct ip_set_net *inst = ip_set_pernet(info->net); 1047 struct ip_set *set, *clash = NULL; 1048 ip_set_id_t index = IPSET_INVALID_ID; 1049 struct nlattr *tb[IPSET_ATTR_CREATE_MAX + 1] = {}; 1050 const char *name, *typename; 1051 u8 family, revision; 1052 u32 flags = flag_exist(info->nlh); 1053 int ret = 0; 1054 1055 if (unlikely(protocol_min_failed(attr) || 1056 !attr[IPSET_ATTR_SETNAME] || 1057 !attr[IPSET_ATTR_TYPENAME] || 1058 !attr[IPSET_ATTR_REVISION] || 1059 !attr[IPSET_ATTR_FAMILY] || 1060 (attr[IPSET_ATTR_DATA] && 1061 !flag_nested(attr[IPSET_ATTR_DATA])))) 1062 return -IPSET_ERR_PROTOCOL; 1063 1064 name = nla_data(attr[IPSET_ATTR_SETNAME]); 1065 typename = nla_data(attr[IPSET_ATTR_TYPENAME]); 1066 family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); 1067 revision = nla_get_u8(attr[IPSET_ATTR_REVISION]); 1068 pr_debug("setname: %s, typename: %s, family: %s, revision: %u\n", 1069 name, typename, family_name(family), revision); 1070 1071 /* First, and without any locks, allocate and initialize 1072 * a normal base set structure. 1073 */ 1074 set = kzalloc(sizeof(*set), GFP_KERNEL); 1075 if (!set) 1076 return -ENOMEM; 1077 spin_lock_init(&set->lock); 1078 strscpy(set->name, name, IPSET_MAXNAMELEN); 1079 set->family = family; 1080 set->revision = revision; 1081 1082 /* Next, check that we know the type, and take 1083 * a reference on the type, to make sure it stays available 1084 * while constructing our new set. 1085 * 1086 * After referencing the type, we try to create the type 1087 * specific part of the set without holding any locks. 1088 */ 1089 ret = find_set_type_get(typename, family, revision, &set->type); 1090 if (ret) 1091 goto out; 1092 1093 /* Without holding any locks, create private part. */ 1094 if (attr[IPSET_ATTR_DATA] && 1095 nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA], 1096 set->type->create_policy, NULL)) { 1097 ret = -IPSET_ERR_PROTOCOL; 1098 goto put_out; 1099 } 1100 /* Set create flags depending on the type revision */ 1101 set->flags |= set->type->create_flags[revision]; 1102 1103 ret = set->type->create(info->net, set, tb, flags); 1104 if (ret != 0) 1105 goto put_out; 1106 1107 /* BTW, ret==0 here. */ 1108 1109 /* Here, we have a valid, constructed set and we are protected 1110 * by the nfnl mutex. Find the first free index in ip_set_list 1111 * and check clashing. 1112 */ 1113 ret = find_free_id(inst, set->name, &index, &clash); 1114 if (ret == -EEXIST) { 1115 /* If this is the same set and requested, ignore error */ 1116 if ((flags & IPSET_FLAG_EXIST) && 1117 STRNCMP(set->type->name, clash->type->name) && 1118 set->type->family == clash->type->family && 1119 set->type->revision_min == clash->type->revision_min && 1120 set->type->revision_max == clash->type->revision_max && 1121 set->variant->same_set(set, clash)) 1122 ret = 0; 1123 goto cleanup; 1124 } else if (ret == -IPSET_ERR_MAX_SETS) { 1125 struct ip_set **list, **tmp; 1126 ip_set_id_t i = inst->ip_set_max + IP_SET_INC; 1127 1128 if (i < inst->ip_set_max || i == IPSET_INVALID_ID) 1129 /* Wraparound */ 1130 goto cleanup; 1131 1132 list = kvcalloc(i, sizeof(struct ip_set *), GFP_KERNEL); 1133 if (!list) 1134 goto cleanup; 1135 /* nfnl mutex is held, both lists are valid */ 1136 tmp = ip_set_dereference(inst->ip_set_list); 1137 memcpy(list, tmp, sizeof(struct ip_set *) * inst->ip_set_max); 1138 rcu_assign_pointer(inst->ip_set_list, list); 1139 /* Make sure all current packets have passed through */ 1140 synchronize_net(); 1141 /* Use new list */ 1142 index = inst->ip_set_max; 1143 inst->ip_set_max = i; 1144 kvfree(tmp); 1145 ret = 0; 1146 } else if (ret) { 1147 goto cleanup; 1148 } 1149 1150 /* Finally! Add our shiny new set to the list, and be done. */ 1151 pr_debug("create: '%s' created with index %u!\n", set->name, index); 1152 ip_set(inst, index) = set; 1153 1154 return ret; 1155 1156cleanup: 1157 set->variant->cancel_gc(set); 1158 set->variant->destroy(set); 1159put_out: 1160 module_put(set->type->me); 1161out: 1162 kfree(set); 1163 return ret; 1164} 1165 1166/* Destroy sets */ 1167 1168static const struct nla_policy 1169ip_set_setname_policy[IPSET_ATTR_CMD_MAX + 1] = { 1170 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1171 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 1172 .len = IPSET_MAXNAMELEN - 1 }, 1173}; 1174 1175static void 1176ip_set_destroy_set(struct ip_set *set) 1177{ 1178 pr_debug("set: %s\n", set->name); 1179 1180 /* Must call it without holding any lock */ 1181 set->variant->destroy(set); 1182 module_put(set->type->me); 1183 kfree(set); 1184} 1185 1186static void 1187ip_set_destroy_set_rcu(struct rcu_head *head) 1188{ 1189 struct ip_set *set = container_of(head, struct ip_set, rcu); 1190 1191 ip_set_destroy_set(set); 1192} 1193 1194static int ip_set_destroy(struct sk_buff *skb, const struct nfnl_info *info, 1195 const struct nlattr * const attr[]) 1196{ 1197 struct ip_set_net *inst = ip_set_pernet(info->net); 1198 struct ip_set *s; 1199 ip_set_id_t i; 1200 int ret = 0; 1201 1202 if (unlikely(protocol_min_failed(attr))) 1203 return -IPSET_ERR_PROTOCOL; 1204 1205 1206 /* Commands are serialized and references are 1207 * protected by the ip_set_ref_lock. 1208 * External systems (i.e. xt_set) must call 1209 * ip_set_put|get_nfnl_* functions, that way we 1210 * can safely check references here. 1211 * 1212 * list:set timer can only decrement the reference 1213 * counter, so if it's already zero, we can proceed 1214 * without holding the lock. 1215 */ 1216 if (!attr[IPSET_ATTR_SETNAME]) { 1217 /* Must wait for flush to be really finished in list:set */ 1218 rcu_barrier(); 1219 read_lock_bh(&ip_set_ref_lock); 1220 for (i = 0; i < inst->ip_set_max; i++) { 1221 s = ip_set(inst, i); 1222 if (s && (s->ref || s->ref_netlink)) { 1223 ret = -IPSET_ERR_BUSY; 1224 goto out; 1225 } 1226 } 1227 inst->is_destroyed = true; 1228 read_unlock_bh(&ip_set_ref_lock); 1229 for (i = 0; i < inst->ip_set_max; i++) { 1230 s = ip_set(inst, i); 1231 if (s) { 1232 ip_set(inst, i) = NULL; 1233 /* Must cancel garbage collectors */ 1234 s->variant->cancel_gc(s); 1235 ip_set_destroy_set(s); 1236 } 1237 } 1238 /* Modified by ip_set_destroy() only, which is serialized */ 1239 inst->is_destroyed = false; 1240 } else { 1241 u32 flags = flag_exist(info->nlh); 1242 u16 features = 0; 1243 1244 read_lock_bh(&ip_set_ref_lock); 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 features = s->type->features; 1256 ip_set(inst, i) = NULL; 1257 read_unlock_bh(&ip_set_ref_lock); 1258 if (features & IPSET_TYPE_NAME) { 1259 /* Must wait for flush to be really finished */ 1260 rcu_barrier(); 1261 } 1262 /* Must cancel garbage collectors */ 1263 s->variant->cancel_gc(s); 1264 call_rcu(&s->rcu, ip_set_destroy_set_rcu); 1265 } 1266 return 0; 1267out: 1268 read_unlock_bh(&ip_set_ref_lock); 1269 return ret; 1270} 1271 1272/* Flush sets */ 1273 1274static void 1275ip_set_flush_set(struct ip_set *set) 1276{ 1277 pr_debug("set: %s\n", set->name); 1278 1279 ip_set_lock(set); 1280 set->variant->flush(set); 1281 ip_set_unlock(set); 1282} 1283 1284static int ip_set_flush(struct sk_buff *skb, const struct nfnl_info *info, 1285 const struct nlattr * const attr[]) 1286{ 1287 struct ip_set_net *inst = ip_set_pernet(info->net); 1288 struct ip_set *s; 1289 ip_set_id_t i; 1290 1291 if (unlikely(protocol_min_failed(attr))) 1292 return -IPSET_ERR_PROTOCOL; 1293 1294 if (!attr[IPSET_ATTR_SETNAME]) { 1295 for (i = 0; i < inst->ip_set_max; i++) { 1296 s = ip_set(inst, i); 1297 if (s) 1298 ip_set_flush_set(s); 1299 } 1300 } else { 1301 s = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1302 if (!s) 1303 return -ENOENT; 1304 1305 ip_set_flush_set(s); 1306 } 1307 1308 return 0; 1309} 1310 1311/* Rename a set */ 1312 1313static const struct nla_policy 1314ip_set_setname2_policy[IPSET_ATTR_CMD_MAX + 1] = { 1315 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1316 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 1317 .len = IPSET_MAXNAMELEN - 1 }, 1318 [IPSET_ATTR_SETNAME2] = { .type = NLA_NUL_STRING, 1319 .len = IPSET_MAXNAMELEN - 1 }, 1320}; 1321 1322static int ip_set_rename(struct sk_buff *skb, const struct nfnl_info *info, 1323 const struct nlattr * const attr[]) 1324{ 1325 struct ip_set_net *inst = ip_set_pernet(info->net); 1326 struct ip_set *set, *s; 1327 const char *name2; 1328 ip_set_id_t i; 1329 int ret = 0; 1330 1331 if (unlikely(protocol_min_failed(attr) || 1332 !attr[IPSET_ATTR_SETNAME] || 1333 !attr[IPSET_ATTR_SETNAME2])) 1334 return -IPSET_ERR_PROTOCOL; 1335 1336 set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1337 if (!set) 1338 return -ENOENT; 1339 1340 write_lock_bh(&ip_set_ref_lock); 1341 if (set->ref != 0 || set->ref_netlink != 0) { 1342 ret = -IPSET_ERR_REFERENCED; 1343 goto out; 1344 } 1345 1346 name2 = nla_data(attr[IPSET_ATTR_SETNAME2]); 1347 for (i = 0; i < inst->ip_set_max; i++) { 1348 s = ip_set(inst, i); 1349 if (s && STRNCMP(s->name, name2)) { 1350 ret = -IPSET_ERR_EXIST_SETNAME2; 1351 goto out; 1352 } 1353 } 1354 strscpy_pad(set->name, name2, IPSET_MAXNAMELEN); 1355 1356out: 1357 write_unlock_bh(&ip_set_ref_lock); 1358 return ret; 1359} 1360 1361/* Swap two sets so that name/index points to the other. 1362 * References and set names are also swapped. 1363 * 1364 * The commands are serialized by the nfnl mutex and references are 1365 * protected by the ip_set_ref_lock. The kernel interfaces 1366 * do not hold the mutex but the pointer settings are atomic 1367 * so the ip_set_list always contains valid pointers to the sets. 1368 */ 1369 1370static int ip_set_swap(struct sk_buff *skb, const struct nfnl_info *info, 1371 const struct nlattr * const attr[]) 1372{ 1373 struct ip_set_net *inst = ip_set_pernet(info->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 strscpy_pad(from_name, from->name, IPSET_MAXNAMELEN); 1409 strscpy_pad(from->name, to->name, IPSET_MAXNAMELEN); 1410 strscpy_pad(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 1430int 1431ip_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} 1452EXPORT_SYMBOL_GPL(ip_set_put_flags); 1453 1454static int 1455ip_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 1471static inline void 1472dump_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 1483static const struct nla_policy 1484ip_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 1491static int 1492ip_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 1536error: 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 1544static int 1545ip_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; 1566dump_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 1656nla_put_failure: 1657 ret = -EFAULT; 1658next_set: 1659 if (dump_type == DUMP_ONE) 1660 cb->args[IPSET_CB_INDEX] = IPSET_INVALID_ID; 1661 else 1662 cb->args[IPSET_CB_INDEX]++; 1663release_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 } 1673out: 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 1683static int ip_set_dump(struct sk_buff *skb, const struct nfnl_info *info, 1684 const struct nlattr * const attr[]) 1685{ 1686 if (unlikely(protocol_min_failed(attr))) 1687 return -IPSET_ERR_PROTOCOL; 1688 1689 { 1690 struct netlink_dump_control c = { 1691 .start = ip_set_dump_start, 1692 .dump = ip_set_dump_do, 1693 .done = ip_set_dump_done, 1694 }; 1695 return netlink_dump_start(info->sk, skb, info->nlh, &c); 1696 } 1697} 1698 1699/* Add, del and test */ 1700 1701static const struct nla_policy ip_set_adt_policy[IPSET_ATTR_CMD_MAX + 1] = { 1702 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1703 [IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING, 1704 .len = IPSET_MAXNAMELEN - 1 }, 1705 [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, 1706 [IPSET_ATTR_DATA] = { .type = NLA_NESTED }, 1707 [IPSET_ATTR_ADT] = { .type = NLA_NESTED }, 1708}; 1709 1710static int 1711call_ad(struct net *net, struct sock *ctnl, struct sk_buff *skb, 1712 struct ip_set *set, struct nlattr *tb[], enum ipset_adt adt, 1713 u32 flags, bool use_lineno) 1714{ 1715 int ret; 1716 u32 lineno = 0; 1717 bool eexist = flags & IPSET_FLAG_EXIST, retried = false; 1718 1719 do { 1720 if (retried) { 1721 __ip_set_get_netlink(set); 1722 nfnl_unlock(NFNL_SUBSYS_IPSET); 1723 cond_resched(); 1724 nfnl_lock(NFNL_SUBSYS_IPSET); 1725 __ip_set_put_netlink(set); 1726 } 1727 1728 ip_set_lock(set); 1729 ret = set->variant->uadt(set, tb, adt, &lineno, flags, retried); 1730 ip_set_unlock(set); 1731 retried = true; 1732 } while (ret == -ERANGE || 1733 (ret == -EAGAIN && 1734 set->variant->resize && 1735 (ret = set->variant->resize(set, retried)) == 0)); 1736 1737 if (!ret || (ret == -IPSET_ERR_EXIST && eexist)) 1738 return 0; 1739 if (lineno && use_lineno) { 1740 /* Error in restore/batch mode: send back lineno */ 1741 struct nlmsghdr *rep, *nlh = nlmsg_hdr(skb); 1742 struct sk_buff *skb2; 1743 struct nlmsgerr *errmsg; 1744 size_t payload = min(SIZE_MAX, 1745 sizeof(*errmsg) + nlmsg_len(nlh)); 1746 int min_len = nlmsg_total_size(sizeof(struct nfgenmsg)); 1747 struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1]; 1748 struct nlattr *cmdattr; 1749 u32 *errline; 1750 1751 skb2 = nlmsg_new(payload, GFP_KERNEL); 1752 if (!skb2) 1753 return -ENOMEM; 1754 rep = nlmsg_put(skb2, NETLINK_CB(skb).portid, 1755 nlh->nlmsg_seq, NLMSG_ERROR, payload, 0); 1756 errmsg = nlmsg_data(rep); 1757 errmsg->error = ret; 1758 unsafe_memcpy(&errmsg->msg, nlh, nlh->nlmsg_len, 1759 /* Bounds checked by the skb layer. */); 1760 1761 cmdattr = (void *)&errmsg->msg + min_len; 1762 1763 ret = nla_parse(cda, IPSET_ATTR_CMD_MAX, cmdattr, 1764 nlh->nlmsg_len - min_len, ip_set_adt_policy, 1765 NULL); 1766 1767 if (ret) { 1768 nlmsg_free(skb2); 1769 return ret; 1770 } 1771 errline = nla_data(cda[IPSET_ATTR_LINENO]); 1772 1773 *errline = lineno; 1774 1775 nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 1776 /* Signal netlink not to send its ACK/errmsg. */ 1777 return -EINTR; 1778 } 1779 1780 return ret; 1781} 1782 1783static int ip_set_ad(struct net *net, struct sock *ctnl, 1784 struct sk_buff *skb, 1785 enum ipset_adt adt, 1786 const struct nlmsghdr *nlh, 1787 const struct nlattr * const attr[], 1788 struct netlink_ext_ack *extack) 1789{ 1790 struct ip_set_net *inst = ip_set_pernet(net); 1791 struct ip_set *set; 1792 struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; 1793 const struct nlattr *nla; 1794 u32 flags = flag_exist(nlh); 1795 bool use_lineno; 1796 int ret = 0; 1797 1798 if (unlikely(protocol_min_failed(attr) || 1799 !attr[IPSET_ATTR_SETNAME] || 1800 !((attr[IPSET_ATTR_DATA] != NULL) ^ 1801 (attr[IPSET_ATTR_ADT] != NULL)) || 1802 (attr[IPSET_ATTR_DATA] && 1803 !flag_nested(attr[IPSET_ATTR_DATA])) || 1804 (attr[IPSET_ATTR_ADT] && 1805 (!flag_nested(attr[IPSET_ATTR_ADT]) || 1806 !attr[IPSET_ATTR_LINENO])))) 1807 return -IPSET_ERR_PROTOCOL; 1808 1809 set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1810 if (!set) 1811 return -ENOENT; 1812 1813 use_lineno = !!attr[IPSET_ATTR_LINENO]; 1814 if (attr[IPSET_ATTR_DATA]) { 1815 if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, 1816 attr[IPSET_ATTR_DATA], 1817 set->type->adt_policy, NULL)) 1818 return -IPSET_ERR_PROTOCOL; 1819 ret = call_ad(net, ctnl, skb, set, tb, adt, flags, 1820 use_lineno); 1821 } else { 1822 int nla_rem; 1823 1824 nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) { 1825 if (nla_type(nla) != IPSET_ATTR_DATA || 1826 !flag_nested(nla) || 1827 nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla, 1828 set->type->adt_policy, NULL)) 1829 return -IPSET_ERR_PROTOCOL; 1830 ret = call_ad(net, ctnl, skb, set, tb, adt, 1831 flags, use_lineno); 1832 if (ret < 0) 1833 return ret; 1834 } 1835 } 1836 return ret; 1837} 1838 1839static int ip_set_uadd(struct sk_buff *skb, const struct nfnl_info *info, 1840 const struct nlattr * const attr[]) 1841{ 1842 return ip_set_ad(info->net, info->sk, skb, 1843 IPSET_ADD, info->nlh, attr, info->extack); 1844} 1845 1846static int ip_set_udel(struct sk_buff *skb, const struct nfnl_info *info, 1847 const struct nlattr * const attr[]) 1848{ 1849 return ip_set_ad(info->net, info->sk, skb, 1850 IPSET_DEL, info->nlh, attr, info->extack); 1851} 1852 1853static int ip_set_utest(struct sk_buff *skb, const struct nfnl_info *info, 1854 const struct nlattr * const attr[]) 1855{ 1856 struct ip_set_net *inst = ip_set_pernet(info->net); 1857 struct ip_set *set; 1858 struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {}; 1859 int ret = 0; 1860 u32 lineno; 1861 1862 if (unlikely(protocol_min_failed(attr) || 1863 !attr[IPSET_ATTR_SETNAME] || 1864 !attr[IPSET_ATTR_DATA] || 1865 !flag_nested(attr[IPSET_ATTR_DATA]))) 1866 return -IPSET_ERR_PROTOCOL; 1867 1868 set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1869 if (!set) 1870 return -ENOENT; 1871 1872 if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA], 1873 set->type->adt_policy, NULL)) 1874 return -IPSET_ERR_PROTOCOL; 1875 1876 rcu_read_lock_bh(); 1877 ret = set->variant->uadt(set, tb, IPSET_TEST, &lineno, 0, 0); 1878 rcu_read_unlock_bh(); 1879 /* Userspace can't trigger element to be re-added */ 1880 if (ret == -EAGAIN) 1881 ret = 1; 1882 1883 return ret > 0 ? 0 : -IPSET_ERR_EXIST; 1884} 1885 1886/* Get headed data of a set */ 1887 1888static int ip_set_header(struct sk_buff *skb, const struct nfnl_info *info, 1889 const struct nlattr * const attr[]) 1890{ 1891 struct ip_set_net *inst = ip_set_pernet(info->net); 1892 const struct ip_set *set; 1893 struct sk_buff *skb2; 1894 struct nlmsghdr *nlh2; 1895 1896 if (unlikely(protocol_min_failed(attr) || 1897 !attr[IPSET_ATTR_SETNAME])) 1898 return -IPSET_ERR_PROTOCOL; 1899 1900 set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME])); 1901 if (!set) 1902 return -ENOENT; 1903 1904 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1905 if (!skb2) 1906 return -ENOMEM; 1907 1908 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, info->nlh->nlmsg_seq, 0, 1909 IPSET_CMD_HEADER); 1910 if (!nlh2) 1911 goto nlmsg_failure; 1912 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) || 1913 nla_put_string(skb2, IPSET_ATTR_SETNAME, set->name) || 1914 nla_put_string(skb2, IPSET_ATTR_TYPENAME, set->type->name) || 1915 nla_put_u8(skb2, IPSET_ATTR_FAMILY, set->family) || 1916 nla_put_u8(skb2, IPSET_ATTR_REVISION, set->revision)) 1917 goto nla_put_failure; 1918 nlmsg_end(skb2, nlh2); 1919 1920 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid); 1921 1922nla_put_failure: 1923 nlmsg_cancel(skb2, nlh2); 1924nlmsg_failure: 1925 kfree_skb(skb2); 1926 return -EMSGSIZE; 1927} 1928 1929/* Get type data */ 1930 1931static const struct nla_policy ip_set_type_policy[IPSET_ATTR_CMD_MAX + 1] = { 1932 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1933 [IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING, 1934 .len = IPSET_MAXNAMELEN - 1 }, 1935 [IPSET_ATTR_FAMILY] = { .type = NLA_U8 }, 1936}; 1937 1938static int ip_set_type(struct sk_buff *skb, const struct nfnl_info *info, 1939 const struct nlattr * const attr[]) 1940{ 1941 struct sk_buff *skb2; 1942 struct nlmsghdr *nlh2; 1943 u8 family, min, max; 1944 const char *typename; 1945 int ret = 0; 1946 1947 if (unlikely(protocol_min_failed(attr) || 1948 !attr[IPSET_ATTR_TYPENAME] || 1949 !attr[IPSET_ATTR_FAMILY])) 1950 return -IPSET_ERR_PROTOCOL; 1951 1952 family = nla_get_u8(attr[IPSET_ATTR_FAMILY]); 1953 typename = nla_data(attr[IPSET_ATTR_TYPENAME]); 1954 ret = find_set_type_minmax(typename, family, &min, &max); 1955 if (ret) 1956 return ret; 1957 1958 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1959 if (!skb2) 1960 return -ENOMEM; 1961 1962 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, info->nlh->nlmsg_seq, 0, 1963 IPSET_CMD_TYPE); 1964 if (!nlh2) 1965 goto nlmsg_failure; 1966 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) || 1967 nla_put_string(skb2, IPSET_ATTR_TYPENAME, typename) || 1968 nla_put_u8(skb2, IPSET_ATTR_FAMILY, family) || 1969 nla_put_u8(skb2, IPSET_ATTR_REVISION, max) || 1970 nla_put_u8(skb2, IPSET_ATTR_REVISION_MIN, min)) 1971 goto nla_put_failure; 1972 nlmsg_end(skb2, nlh2); 1973 1974 pr_debug("Send TYPE, nlmsg_len: %u\n", nlh2->nlmsg_len); 1975 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid); 1976 1977nla_put_failure: 1978 nlmsg_cancel(skb2, nlh2); 1979nlmsg_failure: 1980 kfree_skb(skb2); 1981 return -EMSGSIZE; 1982} 1983 1984/* Get protocol version */ 1985 1986static const struct nla_policy 1987ip_set_protocol_policy[IPSET_ATTR_CMD_MAX + 1] = { 1988 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 1989}; 1990 1991static int ip_set_protocol(struct sk_buff *skb, const struct nfnl_info *info, 1992 const struct nlattr * const attr[]) 1993{ 1994 struct sk_buff *skb2; 1995 struct nlmsghdr *nlh2; 1996 1997 if (unlikely(!attr[IPSET_ATTR_PROTOCOL])) 1998 return -IPSET_ERR_PROTOCOL; 1999 2000 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2001 if (!skb2) 2002 return -ENOMEM; 2003 2004 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, info->nlh->nlmsg_seq, 0, 2005 IPSET_CMD_PROTOCOL); 2006 if (!nlh2) 2007 goto nlmsg_failure; 2008 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL)) 2009 goto nla_put_failure; 2010 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL_MIN, IPSET_PROTOCOL_MIN)) 2011 goto nla_put_failure; 2012 nlmsg_end(skb2, nlh2); 2013 2014 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid); 2015 2016nla_put_failure: 2017 nlmsg_cancel(skb2, nlh2); 2018nlmsg_failure: 2019 kfree_skb(skb2); 2020 return -EMSGSIZE; 2021} 2022 2023/* Get set by name or index, from userspace */ 2024 2025static int ip_set_byname(struct sk_buff *skb, const struct nfnl_info *info, 2026 const struct nlattr * const attr[]) 2027{ 2028 struct ip_set_net *inst = ip_set_pernet(info->net); 2029 struct sk_buff *skb2; 2030 struct nlmsghdr *nlh2; 2031 ip_set_id_t id = IPSET_INVALID_ID; 2032 const struct ip_set *set; 2033 2034 if (unlikely(protocol_failed(attr) || 2035 !attr[IPSET_ATTR_SETNAME])) 2036 return -IPSET_ERR_PROTOCOL; 2037 2038 set = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), &id); 2039 if (id == IPSET_INVALID_ID) 2040 return -ENOENT; 2041 2042 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2043 if (!skb2) 2044 return -ENOMEM; 2045 2046 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, info->nlh->nlmsg_seq, 0, 2047 IPSET_CMD_GET_BYNAME); 2048 if (!nlh2) 2049 goto nlmsg_failure; 2050 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) || 2051 nla_put_u8(skb2, IPSET_ATTR_FAMILY, set->family) || 2052 nla_put_net16(skb2, IPSET_ATTR_INDEX, htons(id))) 2053 goto nla_put_failure; 2054 nlmsg_end(skb2, nlh2); 2055 2056 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid); 2057 2058nla_put_failure: 2059 nlmsg_cancel(skb2, nlh2); 2060nlmsg_failure: 2061 kfree_skb(skb2); 2062 return -EMSGSIZE; 2063} 2064 2065static const struct nla_policy ip_set_index_policy[IPSET_ATTR_CMD_MAX + 1] = { 2066 [IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 }, 2067 [IPSET_ATTR_INDEX] = { .type = NLA_U16 }, 2068}; 2069 2070static int ip_set_byindex(struct sk_buff *skb, const struct nfnl_info *info, 2071 const struct nlattr * const attr[]) 2072{ 2073 struct ip_set_net *inst = ip_set_pernet(info->net); 2074 struct sk_buff *skb2; 2075 struct nlmsghdr *nlh2; 2076 ip_set_id_t id = IPSET_INVALID_ID; 2077 const struct ip_set *set; 2078 2079 if (unlikely(protocol_failed(attr) || 2080 !attr[IPSET_ATTR_INDEX])) 2081 return -IPSET_ERR_PROTOCOL; 2082 2083 id = ip_set_get_h16(attr[IPSET_ATTR_INDEX]); 2084 if (id >= inst->ip_set_max) 2085 return -ENOENT; 2086 set = ip_set(inst, id); 2087 if (set == NULL) 2088 return -ENOENT; 2089 2090 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 2091 if (!skb2) 2092 return -ENOMEM; 2093 2094 nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, info->nlh->nlmsg_seq, 0, 2095 IPSET_CMD_GET_BYINDEX); 2096 if (!nlh2) 2097 goto nlmsg_failure; 2098 if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) || 2099 nla_put_string(skb2, IPSET_ATTR_SETNAME, set->name)) 2100 goto nla_put_failure; 2101 nlmsg_end(skb2, nlh2); 2102 2103 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid); 2104 2105nla_put_failure: 2106 nlmsg_cancel(skb2, nlh2); 2107nlmsg_failure: 2108 kfree_skb(skb2); 2109 return -EMSGSIZE; 2110} 2111 2112static const struct nfnl_callback ip_set_netlink_subsys_cb[IPSET_MSG_MAX] = { 2113 [IPSET_CMD_NONE] = { 2114 .call = ip_set_none, 2115 .type = NFNL_CB_MUTEX, 2116 .attr_count = IPSET_ATTR_CMD_MAX, 2117 }, 2118 [IPSET_CMD_CREATE] = { 2119 .call = ip_set_create, 2120 .type = NFNL_CB_MUTEX, 2121 .attr_count = IPSET_ATTR_CMD_MAX, 2122 .policy = ip_set_create_policy, 2123 }, 2124 [IPSET_CMD_DESTROY] = { 2125 .call = ip_set_destroy, 2126 .type = NFNL_CB_MUTEX, 2127 .attr_count = IPSET_ATTR_CMD_MAX, 2128 .policy = ip_set_setname_policy, 2129 }, 2130 [IPSET_CMD_FLUSH] = { 2131 .call = ip_set_flush, 2132 .type = NFNL_CB_MUTEX, 2133 .attr_count = IPSET_ATTR_CMD_MAX, 2134 .policy = ip_set_setname_policy, 2135 }, 2136 [IPSET_CMD_RENAME] = { 2137 .call = ip_set_rename, 2138 .type = NFNL_CB_MUTEX, 2139 .attr_count = IPSET_ATTR_CMD_MAX, 2140 .policy = ip_set_setname2_policy, 2141 }, 2142 [IPSET_CMD_SWAP] = { 2143 .call = ip_set_swap, 2144 .type = NFNL_CB_MUTEX, 2145 .attr_count = IPSET_ATTR_CMD_MAX, 2146 .policy = ip_set_setname2_policy, 2147 }, 2148 [IPSET_CMD_LIST] = { 2149 .call = ip_set_dump, 2150 .type = NFNL_CB_MUTEX, 2151 .attr_count = IPSET_ATTR_CMD_MAX, 2152 .policy = ip_set_dump_policy, 2153 }, 2154 [IPSET_CMD_SAVE] = { 2155 .call = ip_set_dump, 2156 .type = NFNL_CB_MUTEX, 2157 .attr_count = IPSET_ATTR_CMD_MAX, 2158 .policy = ip_set_setname_policy, 2159 }, 2160 [IPSET_CMD_ADD] = { 2161 .call = ip_set_uadd, 2162 .type = NFNL_CB_MUTEX, 2163 .attr_count = IPSET_ATTR_CMD_MAX, 2164 .policy = ip_set_adt_policy, 2165 }, 2166 [IPSET_CMD_DEL] = { 2167 .call = ip_set_udel, 2168 .type = NFNL_CB_MUTEX, 2169 .attr_count = IPSET_ATTR_CMD_MAX, 2170 .policy = ip_set_adt_policy, 2171 }, 2172 [IPSET_CMD_TEST] = { 2173 .call = ip_set_utest, 2174 .type = NFNL_CB_MUTEX, 2175 .attr_count = IPSET_ATTR_CMD_MAX, 2176 .policy = ip_set_adt_policy, 2177 }, 2178 [IPSET_CMD_HEADER] = { 2179 .call = ip_set_header, 2180 .type = NFNL_CB_MUTEX, 2181 .attr_count = IPSET_ATTR_CMD_MAX, 2182 .policy = ip_set_setname_policy, 2183 }, 2184 [IPSET_CMD_TYPE] = { 2185 .call = ip_set_type, 2186 .type = NFNL_CB_MUTEX, 2187 .attr_count = IPSET_ATTR_CMD_MAX, 2188 .policy = ip_set_type_policy, 2189 }, 2190 [IPSET_CMD_PROTOCOL] = { 2191 .call = ip_set_protocol, 2192 .type = NFNL_CB_MUTEX, 2193 .attr_count = IPSET_ATTR_CMD_MAX, 2194 .policy = ip_set_protocol_policy, 2195 }, 2196 [IPSET_CMD_GET_BYNAME] = { 2197 .call = ip_set_byname, 2198 .type = NFNL_CB_MUTEX, 2199 .attr_count = IPSET_ATTR_CMD_MAX, 2200 .policy = ip_set_setname_policy, 2201 }, 2202 [IPSET_CMD_GET_BYINDEX] = { 2203 .call = ip_set_byindex, 2204 .type = NFNL_CB_MUTEX, 2205 .attr_count = IPSET_ATTR_CMD_MAX, 2206 .policy = ip_set_index_policy, 2207 }, 2208}; 2209 2210static struct nfnetlink_subsystem ip_set_netlink_subsys __read_mostly = { 2211 .name = "ip_set", 2212 .subsys_id = NFNL_SUBSYS_IPSET, 2213 .cb_count = IPSET_MSG_MAX, 2214 .cb = ip_set_netlink_subsys_cb, 2215}; 2216 2217/* Interface to iptables/ip6tables */ 2218 2219static int 2220ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len) 2221{ 2222 unsigned int *op; 2223 void *data; 2224 int copylen = *len, ret = 0; 2225 struct net *net = sock_net(sk); 2226 struct ip_set_net *inst = ip_set_pernet(net); 2227 2228 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2229 return -EPERM; 2230 if (optval != SO_IP_SET) 2231 return -EBADF; 2232 if (*len < sizeof(unsigned int)) 2233 return -EINVAL; 2234 2235 data = vmalloc(*len); 2236 if (!data) 2237 return -ENOMEM; 2238 if (copy_from_user(data, user, *len) != 0) { 2239 ret = -EFAULT; 2240 goto done; 2241 } 2242 op = data; 2243 2244 if (*op < IP_SET_OP_VERSION) { 2245 /* Check the version at the beginning of operations */ 2246 struct ip_set_req_version *req_version = data; 2247 2248 if (*len < sizeof(struct ip_set_req_version)) { 2249 ret = -EINVAL; 2250 goto done; 2251 } 2252 2253 if (req_version->version < IPSET_PROTOCOL_MIN) { 2254 ret = -EPROTO; 2255 goto done; 2256 } 2257 } 2258 2259 switch (*op) { 2260 case IP_SET_OP_VERSION: { 2261 struct ip_set_req_version *req_version = data; 2262 2263 if (*len != sizeof(struct ip_set_req_version)) { 2264 ret = -EINVAL; 2265 goto done; 2266 } 2267 2268 req_version->version = IPSET_PROTOCOL; 2269 if (copy_to_user(user, req_version, 2270 sizeof(struct ip_set_req_version))) 2271 ret = -EFAULT; 2272 goto done; 2273 } 2274 case IP_SET_OP_GET_BYNAME: { 2275 struct ip_set_req_get_set *req_get = data; 2276 ip_set_id_t id; 2277 2278 if (*len != sizeof(struct ip_set_req_get_set)) { 2279 ret = -EINVAL; 2280 goto done; 2281 } 2282 req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; 2283 nfnl_lock(NFNL_SUBSYS_IPSET); 2284 find_set_and_id(inst, req_get->set.name, &id); 2285 req_get->set.index = id; 2286 nfnl_unlock(NFNL_SUBSYS_IPSET); 2287 goto copy; 2288 } 2289 case IP_SET_OP_GET_FNAME: { 2290 struct ip_set_req_get_set_family *req_get = data; 2291 ip_set_id_t id; 2292 2293 if (*len != sizeof(struct ip_set_req_get_set_family)) { 2294 ret = -EINVAL; 2295 goto done; 2296 } 2297 req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0'; 2298 nfnl_lock(NFNL_SUBSYS_IPSET); 2299 find_set_and_id(inst, req_get->set.name, &id); 2300 req_get->set.index = id; 2301 if (id != IPSET_INVALID_ID) 2302 req_get->family = ip_set(inst, id)->family; 2303 nfnl_unlock(NFNL_SUBSYS_IPSET); 2304 goto copy; 2305 } 2306 case IP_SET_OP_GET_BYINDEX: { 2307 struct ip_set_req_get_set *req_get = data; 2308 struct ip_set *set; 2309 2310 if (*len != sizeof(struct ip_set_req_get_set) || 2311 req_get->set.index >= inst->ip_set_max) { 2312 ret = -EINVAL; 2313 goto done; 2314 } 2315 nfnl_lock(NFNL_SUBSYS_IPSET); 2316 set = ip_set(inst, req_get->set.index); 2317 ret = strscpy(req_get->set.name, set ? set->name : "", 2318 IPSET_MAXNAMELEN); 2319 nfnl_unlock(NFNL_SUBSYS_IPSET); 2320 if (ret < 0) 2321 goto done; 2322 goto copy; 2323 } 2324 default: 2325 ret = -EBADMSG; 2326 goto done; 2327 } /* end of switch(op) */ 2328 2329copy: 2330 if (copy_to_user(user, data, copylen)) 2331 ret = -EFAULT; 2332 2333done: 2334 vfree(data); 2335 if (ret > 0) 2336 ret = 0; 2337 return ret; 2338} 2339 2340static struct nf_sockopt_ops so_set __read_mostly = { 2341 .pf = PF_INET, 2342 .get_optmin = SO_IP_SET, 2343 .get_optmax = SO_IP_SET + 1, 2344 .get = ip_set_sockfn_get, 2345 .owner = THIS_MODULE, 2346}; 2347 2348static int __net_init 2349ip_set_net_init(struct net *net) 2350{ 2351 struct ip_set_net *inst = ip_set_pernet(net); 2352 struct ip_set **list; 2353 2354 inst->ip_set_max = max_sets ? max_sets : CONFIG_IP_SET_MAX; 2355 if (inst->ip_set_max >= IPSET_INVALID_ID) 2356 inst->ip_set_max = IPSET_INVALID_ID - 1; 2357 2358 list = kvcalloc(inst->ip_set_max, sizeof(struct ip_set *), GFP_KERNEL); 2359 if (!list) 2360 return -ENOMEM; 2361 inst->is_deleted = false; 2362 inst->is_destroyed = false; 2363 rcu_assign_pointer(inst->ip_set_list, list); 2364 return 0; 2365} 2366 2367static void __net_exit 2368ip_set_net_exit(struct net *net) 2369{ 2370 struct ip_set_net *inst = ip_set_pernet(net); 2371 2372 struct ip_set *set = NULL; 2373 ip_set_id_t i; 2374 2375 inst->is_deleted = true; /* flag for ip_set_nfnl_put */ 2376 2377 nfnl_lock(NFNL_SUBSYS_IPSET); 2378 for (i = 0; i < inst->ip_set_max; i++) { 2379 set = ip_set(inst, i); 2380 if (set) { 2381 ip_set(inst, i) = NULL; 2382 set->variant->cancel_gc(set); 2383 ip_set_destroy_set(set); 2384 } 2385 } 2386 nfnl_unlock(NFNL_SUBSYS_IPSET); 2387 kvfree(rcu_dereference_protected(inst->ip_set_list, 1)); 2388} 2389 2390static struct pernet_operations ip_set_net_ops = { 2391 .init = ip_set_net_init, 2392 .exit = ip_set_net_exit, 2393 .id = &ip_set_net_id, 2394 .size = sizeof(struct ip_set_net), 2395}; 2396 2397static int __init 2398ip_set_init(void) 2399{ 2400 int ret = register_pernet_subsys(&ip_set_net_ops); 2401 2402 if (ret) { 2403 pr_err("ip_set: cannot register pernet_subsys.\n"); 2404 return ret; 2405 } 2406 2407 ret = nfnetlink_subsys_register(&ip_set_netlink_subsys); 2408 if (ret != 0) { 2409 pr_err("ip_set: cannot register with nfnetlink.\n"); 2410 unregister_pernet_subsys(&ip_set_net_ops); 2411 return ret; 2412 } 2413 2414 ret = nf_register_sockopt(&so_set); 2415 if (ret != 0) { 2416 pr_err("SO_SET registry failed: %d\n", ret); 2417 nfnetlink_subsys_unregister(&ip_set_netlink_subsys); 2418 unregister_pernet_subsys(&ip_set_net_ops); 2419 return ret; 2420 } 2421 2422 return 0; 2423} 2424 2425static void __exit 2426ip_set_fini(void) 2427{ 2428 nf_unregister_sockopt(&so_set); 2429 nfnetlink_subsys_unregister(&ip_set_netlink_subsys); 2430 unregister_pernet_subsys(&ip_set_net_ops); 2431 2432 /* Wait for call_rcu() in destroy */ 2433 rcu_barrier(); 2434 2435 pr_debug("these are the famous last words\n"); 2436} 2437 2438module_init(ip_set_init); 2439module_exit(ip_set_fini); 2440 2441MODULE_DESCRIPTION("ip_set: protocol " __stringify(IPSET_PROTOCOL)); 2442