1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * Generic INET transport hashtables 8 * 9 * Authors: Lotsa people, from code originally in tcp 10 */ 11 12#include <linux/module.h> 13#include <linux/random.h> 14#include <linux/sched.h> 15#include <linux/slab.h> 16#include <linux/wait.h> 17#include <linux/vmalloc.h> 18#include <linux/memblock.h> 19 20#include <net/addrconf.h> 21#include <net/inet_connection_sock.h> 22#include <net/inet_hashtables.h> 23#if IS_ENABLED(CONFIG_IPV6) 24#include <net/inet6_hashtables.h> 25#endif 26#include <net/secure_seq.h> 27#include <net/hotdata.h> 28#include <net/ip.h> 29#include <net/tcp.h> 30#include <net/sock_reuseport.h> 31 32u32 inet_ehashfn(const struct net *net, const __be32 laddr, 33 const __u16 lport, const __be32 faddr, 34 const __be16 fport) 35{ 36 net_get_random_once(&inet_ehash_secret, sizeof(inet_ehash_secret)); 37 38 return __inet_ehashfn(laddr, lport, faddr, fport, 39 inet_ehash_secret + net_hash_mix(net)); 40} 41EXPORT_SYMBOL_GPL(inet_ehashfn); 42 43/* This function handles inet_sock, but also timewait and request sockets 44 * for IPv4/IPv6. 45 */ 46static u32 sk_ehashfn(const struct sock *sk) 47{ 48#if IS_ENABLED(CONFIG_IPV6) 49 if (sk->sk_family == AF_INET6 && 50 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) 51 return inet6_ehashfn(sock_net(sk), 52 &sk->sk_v6_rcv_saddr, sk->sk_num, 53 &sk->sk_v6_daddr, sk->sk_dport); 54#endif 55 return inet_ehashfn(sock_net(sk), 56 sk->sk_rcv_saddr, sk->sk_num, 57 sk->sk_daddr, sk->sk_dport); 58} 59 60/* 61 * Allocate and initialize a new local port bind bucket. 62 * The bindhash mutex for snum's hash chain must be held here. 63 */ 64struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep, 65 struct net *net, 66 struct inet_bind_hashbucket *head, 67 const unsigned short snum, 68 int l3mdev) 69{ 70 struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC); 71 72 if (tb) { 73 write_pnet(&tb->ib_net, net); 74 tb->l3mdev = l3mdev; 75 tb->port = snum; 76 tb->fastreuse = 0; 77 tb->fastreuseport = 0; 78 INIT_HLIST_HEAD(&tb->bhash2); 79 hlist_add_head(&tb->node, &head->chain); 80 } 81 return tb; 82} 83 84/* 85 * Caller must hold hashbucket lock for this tb with local BH disabled 86 */ 87void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb) 88{ 89 if (hlist_empty(&tb->bhash2)) { 90 __hlist_del(&tb->node); 91 kmem_cache_free(cachep, tb); 92 } 93} 94 95bool inet_bind_bucket_match(const struct inet_bind_bucket *tb, const struct net *net, 96 unsigned short port, int l3mdev) 97{ 98 return net_eq(ib_net(tb), net) && tb->port == port && 99 tb->l3mdev == l3mdev; 100} 101 102static void inet_bind2_bucket_init(struct inet_bind2_bucket *tb2, 103 struct net *net, 104 struct inet_bind_hashbucket *head, 105 struct inet_bind_bucket *tb, 106 const struct sock *sk) 107{ 108 write_pnet(&tb2->ib_net, net); 109 tb2->l3mdev = tb->l3mdev; 110 tb2->port = tb->port; 111#if IS_ENABLED(CONFIG_IPV6) 112 BUILD_BUG_ON(USHRT_MAX < (IPV6_ADDR_ANY | IPV6_ADDR_MAPPED)); 113 if (sk->sk_family == AF_INET6) { 114 tb2->addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr); 115 tb2->v6_rcv_saddr = sk->sk_v6_rcv_saddr; 116 } else { 117 tb2->addr_type = IPV6_ADDR_MAPPED; 118 ipv6_addr_set_v4mapped(sk->sk_rcv_saddr, &tb2->v6_rcv_saddr); 119 } 120#else 121 tb2->rcv_saddr = sk->sk_rcv_saddr; 122#endif 123 INIT_HLIST_HEAD(&tb2->owners); 124 hlist_add_head(&tb2->node, &head->chain); 125 hlist_add_head(&tb2->bhash_node, &tb->bhash2); 126} 127 128struct inet_bind2_bucket *inet_bind2_bucket_create(struct kmem_cache *cachep, 129 struct net *net, 130 struct inet_bind_hashbucket *head, 131 struct inet_bind_bucket *tb, 132 const struct sock *sk) 133{ 134 struct inet_bind2_bucket *tb2 = kmem_cache_alloc(cachep, GFP_ATOMIC); 135 136 if (tb2) 137 inet_bind2_bucket_init(tb2, net, head, tb, sk); 138 139 return tb2; 140} 141 142/* Caller must hold hashbucket lock for this tb with local BH disabled */ 143void inet_bind2_bucket_destroy(struct kmem_cache *cachep, struct inet_bind2_bucket *tb) 144{ 145 if (hlist_empty(&tb->owners)) { 146 __hlist_del(&tb->node); 147 __hlist_del(&tb->bhash_node); 148 kmem_cache_free(cachep, tb); 149 } 150} 151 152static bool inet_bind2_bucket_addr_match(const struct inet_bind2_bucket *tb2, 153 const struct sock *sk) 154{ 155#if IS_ENABLED(CONFIG_IPV6) 156 if (sk->sk_family == AF_INET6) 157 return ipv6_addr_equal(&tb2->v6_rcv_saddr, &sk->sk_v6_rcv_saddr); 158 159 if (tb2->addr_type != IPV6_ADDR_MAPPED) 160 return false; 161#endif 162 return tb2->rcv_saddr == sk->sk_rcv_saddr; 163} 164 165void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb, 166 struct inet_bind2_bucket *tb2, unsigned short port) 167{ 168 inet_sk(sk)->inet_num = port; 169 inet_csk(sk)->icsk_bind_hash = tb; 170 inet_csk(sk)->icsk_bind2_hash = tb2; 171 sk_add_bind_node(sk, &tb2->owners); 172} 173 174/* 175 * Get rid of any references to a local port held by the given sock. 176 */ 177static void __inet_put_port(struct sock *sk) 178{ 179 struct inet_hashinfo *hashinfo = tcp_or_dccp_get_hashinfo(sk); 180 struct inet_bind_hashbucket *head, *head2; 181 struct net *net = sock_net(sk); 182 struct inet_bind_bucket *tb; 183 int bhash; 184 185 bhash = inet_bhashfn(net, inet_sk(sk)->inet_num, hashinfo->bhash_size); 186 head = &hashinfo->bhash[bhash]; 187 head2 = inet_bhashfn_portaddr(hashinfo, sk, net, inet_sk(sk)->inet_num); 188 189 spin_lock(&head->lock); 190 tb = inet_csk(sk)->icsk_bind_hash; 191 inet_csk(sk)->icsk_bind_hash = NULL; 192 inet_sk(sk)->inet_num = 0; 193 194 spin_lock(&head2->lock); 195 if (inet_csk(sk)->icsk_bind2_hash) { 196 struct inet_bind2_bucket *tb2 = inet_csk(sk)->icsk_bind2_hash; 197 198 __sk_del_bind_node(sk); 199 inet_csk(sk)->icsk_bind2_hash = NULL; 200 inet_bind2_bucket_destroy(hashinfo->bind2_bucket_cachep, tb2); 201 } 202 spin_unlock(&head2->lock); 203 204 inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb); 205 spin_unlock(&head->lock); 206} 207 208void inet_put_port(struct sock *sk) 209{ 210 local_bh_disable(); 211 __inet_put_port(sk); 212 local_bh_enable(); 213} 214EXPORT_SYMBOL(inet_put_port); 215 216int __inet_inherit_port(const struct sock *sk, struct sock *child) 217{ 218 struct inet_hashinfo *table = tcp_or_dccp_get_hashinfo(sk); 219 unsigned short port = inet_sk(child)->inet_num; 220 struct inet_bind_hashbucket *head, *head2; 221 bool created_inet_bind_bucket = false; 222 struct net *net = sock_net(sk); 223 bool update_fastreuse = false; 224 struct inet_bind2_bucket *tb2; 225 struct inet_bind_bucket *tb; 226 int bhash, l3mdev; 227 228 bhash = inet_bhashfn(net, port, table->bhash_size); 229 head = &table->bhash[bhash]; 230 head2 = inet_bhashfn_portaddr(table, child, net, port); 231 232 spin_lock(&head->lock); 233 spin_lock(&head2->lock); 234 tb = inet_csk(sk)->icsk_bind_hash; 235 tb2 = inet_csk(sk)->icsk_bind2_hash; 236 if (unlikely(!tb || !tb2)) { 237 spin_unlock(&head2->lock); 238 spin_unlock(&head->lock); 239 return -ENOENT; 240 } 241 if (tb->port != port) { 242 l3mdev = inet_sk_bound_l3mdev(sk); 243 244 /* NOTE: using tproxy and redirecting skbs to a proxy 245 * on a different listener port breaks the assumption 246 * that the listener socket's icsk_bind_hash is the same 247 * as that of the child socket. We have to look up or 248 * create a new bind bucket for the child here. */ 249 inet_bind_bucket_for_each(tb, &head->chain) { 250 if (inet_bind_bucket_match(tb, net, port, l3mdev)) 251 break; 252 } 253 if (!tb) { 254 tb = inet_bind_bucket_create(table->bind_bucket_cachep, 255 net, head, port, l3mdev); 256 if (!tb) { 257 spin_unlock(&head2->lock); 258 spin_unlock(&head->lock); 259 return -ENOMEM; 260 } 261 created_inet_bind_bucket = true; 262 } 263 update_fastreuse = true; 264 265 goto bhash2_find; 266 } else if (!inet_bind2_bucket_addr_match(tb2, child)) { 267 l3mdev = inet_sk_bound_l3mdev(sk); 268 269bhash2_find: 270 tb2 = inet_bind2_bucket_find(head2, net, port, l3mdev, child); 271 if (!tb2) { 272 tb2 = inet_bind2_bucket_create(table->bind2_bucket_cachep, 273 net, head2, tb, child); 274 if (!tb2) 275 goto error; 276 } 277 } 278 if (update_fastreuse) 279 inet_csk_update_fastreuse(tb, child); 280 inet_bind_hash(child, tb, tb2, port); 281 spin_unlock(&head2->lock); 282 spin_unlock(&head->lock); 283 284 return 0; 285 286error: 287 if (created_inet_bind_bucket) 288 inet_bind_bucket_destroy(table->bind_bucket_cachep, tb); 289 spin_unlock(&head2->lock); 290 spin_unlock(&head->lock); 291 return -ENOMEM; 292} 293EXPORT_SYMBOL_GPL(__inet_inherit_port); 294 295static struct inet_listen_hashbucket * 296inet_lhash2_bucket_sk(struct inet_hashinfo *h, struct sock *sk) 297{ 298 u32 hash; 299 300#if IS_ENABLED(CONFIG_IPV6) 301 if (sk->sk_family == AF_INET6) 302 hash = ipv6_portaddr_hash(sock_net(sk), 303 &sk->sk_v6_rcv_saddr, 304 inet_sk(sk)->inet_num); 305 else 306#endif 307 hash = ipv4_portaddr_hash(sock_net(sk), 308 inet_sk(sk)->inet_rcv_saddr, 309 inet_sk(sk)->inet_num); 310 return inet_lhash2_bucket(h, hash); 311} 312 313static inline int compute_score(struct sock *sk, struct net *net, 314 const unsigned short hnum, const __be32 daddr, 315 const int dif, const int sdif) 316{ 317 int score = -1; 318 319 if (net_eq(sock_net(sk), net) && sk->sk_num == hnum && 320 !ipv6_only_sock(sk)) { 321 if (sk->sk_rcv_saddr != daddr) 322 return -1; 323 324 if (!inet_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif)) 325 return -1; 326 score = sk->sk_bound_dev_if ? 2 : 1; 327 328 if (sk->sk_family == PF_INET) 329 score++; 330 if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id()) 331 score++; 332 } 333 return score; 334} 335 336/** 337 * inet_lookup_reuseport() - execute reuseport logic on AF_INET socket if necessary. 338 * @net: network namespace. 339 * @sk: AF_INET socket, must be in TCP_LISTEN state for TCP or TCP_CLOSE for UDP. 340 * @skb: context for a potential SK_REUSEPORT program. 341 * @doff: header offset. 342 * @saddr: source address. 343 * @sport: source port. 344 * @daddr: destination address. 345 * @hnum: destination port in host byte order. 346 * @ehashfn: hash function used to generate the fallback hash. 347 * 348 * Return: NULL if sk doesn't have SO_REUSEPORT set, otherwise a pointer to 349 * the selected sock or an error. 350 */ 351struct sock *inet_lookup_reuseport(struct net *net, struct sock *sk, 352 struct sk_buff *skb, int doff, 353 __be32 saddr, __be16 sport, 354 __be32 daddr, unsigned short hnum, 355 inet_ehashfn_t *ehashfn) 356{ 357 struct sock *reuse_sk = NULL; 358 u32 phash; 359 360 if (sk->sk_reuseport) { 361 phash = INDIRECT_CALL_2(ehashfn, udp_ehashfn, inet_ehashfn, 362 net, daddr, hnum, saddr, sport); 363 reuse_sk = reuseport_select_sock(sk, phash, skb, doff); 364 } 365 return reuse_sk; 366} 367EXPORT_SYMBOL_GPL(inet_lookup_reuseport); 368 369/* 370 * Here are some nice properties to exploit here. The BSD API 371 * does not allow a listening sock to specify the remote port nor the 372 * remote address for the connection. So always assume those are both 373 * wildcarded during the search since they can never be otherwise. 374 */ 375 376/* called with rcu_read_lock() : No refcount taken on the socket */ 377static struct sock *inet_lhash2_lookup(struct net *net, 378 struct inet_listen_hashbucket *ilb2, 379 struct sk_buff *skb, int doff, 380 const __be32 saddr, __be16 sport, 381 const __be32 daddr, const unsigned short hnum, 382 const int dif, const int sdif) 383{ 384 struct sock *sk, *result = NULL; 385 struct hlist_nulls_node *node; 386 int score, hiscore = 0; 387 388 sk_nulls_for_each_rcu(sk, node, &ilb2->nulls_head) { 389 score = compute_score(sk, net, hnum, daddr, dif, sdif); 390 if (score > hiscore) { 391 result = inet_lookup_reuseport(net, sk, skb, doff, 392 saddr, sport, daddr, hnum, inet_ehashfn); 393 if (result) 394 return result; 395 396 result = sk; 397 hiscore = score; 398 } 399 } 400 401 return result; 402} 403 404struct sock *inet_lookup_run_sk_lookup(struct net *net, 405 int protocol, 406 struct sk_buff *skb, int doff, 407 __be32 saddr, __be16 sport, 408 __be32 daddr, u16 hnum, const int dif, 409 inet_ehashfn_t *ehashfn) 410{ 411 struct sock *sk, *reuse_sk; 412 bool no_reuseport; 413 414 no_reuseport = bpf_sk_lookup_run_v4(net, protocol, saddr, sport, 415 daddr, hnum, dif, &sk); 416 if (no_reuseport || IS_ERR_OR_NULL(sk)) 417 return sk; 418 419 reuse_sk = inet_lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum, 420 ehashfn); 421 if (reuse_sk) 422 sk = reuse_sk; 423 return sk; 424} 425 426struct sock *__inet_lookup_listener(struct net *net, 427 struct inet_hashinfo *hashinfo, 428 struct sk_buff *skb, int doff, 429 const __be32 saddr, __be16 sport, 430 const __be32 daddr, const unsigned short hnum, 431 const int dif, const int sdif) 432{ 433 struct inet_listen_hashbucket *ilb2; 434 struct sock *result = NULL; 435 unsigned int hash2; 436 437 /* Lookup redirect from BPF */ 438 if (static_branch_unlikely(&bpf_sk_lookup_enabled) && 439 hashinfo == net->ipv4.tcp_death_row.hashinfo) { 440 result = inet_lookup_run_sk_lookup(net, IPPROTO_TCP, skb, doff, 441 saddr, sport, daddr, hnum, dif, 442 inet_ehashfn); 443 if (result) 444 goto done; 445 } 446 447 hash2 = ipv4_portaddr_hash(net, daddr, hnum); 448 ilb2 = inet_lhash2_bucket(hashinfo, hash2); 449 450 result = inet_lhash2_lookup(net, ilb2, skb, doff, 451 saddr, sport, daddr, hnum, 452 dif, sdif); 453 if (result) 454 goto done; 455 456 /* Lookup lhash2 with INADDR_ANY */ 457 hash2 = ipv4_portaddr_hash(net, htonl(INADDR_ANY), hnum); 458 ilb2 = inet_lhash2_bucket(hashinfo, hash2); 459 460 result = inet_lhash2_lookup(net, ilb2, skb, doff, 461 saddr, sport, htonl(INADDR_ANY), hnum, 462 dif, sdif); 463done: 464 if (IS_ERR(result)) 465 return NULL; 466 return result; 467} 468EXPORT_SYMBOL_GPL(__inet_lookup_listener); 469 470/* All sockets share common refcount, but have different destructors */ 471void sock_gen_put(struct sock *sk) 472{ 473 if (!refcount_dec_and_test(&sk->sk_refcnt)) 474 return; 475 476 if (sk->sk_state == TCP_TIME_WAIT) 477 inet_twsk_free(inet_twsk(sk)); 478 else if (sk->sk_state == TCP_NEW_SYN_RECV) 479 reqsk_free(inet_reqsk(sk)); 480 else 481 sk_free(sk); 482} 483EXPORT_SYMBOL_GPL(sock_gen_put); 484 485void sock_edemux(struct sk_buff *skb) 486{ 487 sock_gen_put(skb->sk); 488} 489EXPORT_SYMBOL(sock_edemux); 490 491struct sock *__inet_lookup_established(struct net *net, 492 struct inet_hashinfo *hashinfo, 493 const __be32 saddr, const __be16 sport, 494 const __be32 daddr, const u16 hnum, 495 const int dif, const int sdif) 496{ 497 INET_ADDR_COOKIE(acookie, saddr, daddr); 498 const __portpair ports = INET_COMBINED_PORTS(sport, hnum); 499 struct sock *sk; 500 const struct hlist_nulls_node *node; 501 /* Optimize here for direct hit, only listening connections can 502 * have wildcards anyways. 503 */ 504 unsigned int hash = inet_ehashfn(net, daddr, hnum, saddr, sport); 505 unsigned int slot = hash & hashinfo->ehash_mask; 506 struct inet_ehash_bucket *head = &hashinfo->ehash[slot]; 507 508begin: 509 sk_nulls_for_each_rcu(sk, node, &head->chain) { 510 if (sk->sk_hash != hash) 511 continue; 512 if (likely(inet_match(net, sk, acookie, ports, dif, sdif))) { 513 if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt))) 514 goto out; 515 if (unlikely(!inet_match(net, sk, acookie, 516 ports, dif, sdif))) { 517 sock_gen_put(sk); 518 goto begin; 519 } 520 goto found; 521 } 522 } 523 /* 524 * if the nulls value we got at the end of this lookup is 525 * not the expected one, we must restart lookup. 526 * We probably met an item that was moved to another chain. 527 */ 528 if (get_nulls_value(node) != slot) 529 goto begin; 530out: 531 sk = NULL; 532found: 533 return sk; 534} 535EXPORT_SYMBOL_GPL(__inet_lookup_established); 536 537/* called with local bh disabled */ 538static int __inet_check_established(struct inet_timewait_death_row *death_row, 539 struct sock *sk, __u16 lport, 540 struct inet_timewait_sock **twp) 541{ 542 struct inet_hashinfo *hinfo = death_row->hashinfo; 543 struct inet_sock *inet = inet_sk(sk); 544 __be32 daddr = inet->inet_rcv_saddr; 545 __be32 saddr = inet->inet_daddr; 546 int dif = sk->sk_bound_dev_if; 547 struct net *net = sock_net(sk); 548 int sdif = l3mdev_master_ifindex_by_index(net, dif); 549 INET_ADDR_COOKIE(acookie, saddr, daddr); 550 const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport); 551 unsigned int hash = inet_ehashfn(net, daddr, lport, 552 saddr, inet->inet_dport); 553 struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); 554 spinlock_t *lock = inet_ehash_lockp(hinfo, hash); 555 struct sock *sk2; 556 const struct hlist_nulls_node *node; 557 struct inet_timewait_sock *tw = NULL; 558 559 spin_lock(lock); 560 561 sk_nulls_for_each(sk2, node, &head->chain) { 562 if (sk2->sk_hash != hash) 563 continue; 564 565 if (likely(inet_match(net, sk2, acookie, ports, dif, sdif))) { 566 if (sk2->sk_state == TCP_TIME_WAIT) { 567 tw = inet_twsk(sk2); 568 if (twsk_unique(sk, sk2, twp)) 569 break; 570 } 571 goto not_unique; 572 } 573 } 574 575 /* Must record num and sport now. Otherwise we will see 576 * in hash table socket with a funny identity. 577 */ 578 inet->inet_num = lport; 579 inet->inet_sport = htons(lport); 580 sk->sk_hash = hash; 581 WARN_ON(!sk_unhashed(sk)); 582 __sk_nulls_add_node_rcu(sk, &head->chain); 583 if (tw) { 584 sk_nulls_del_node_init_rcu((struct sock *)tw); 585 __NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED); 586 } 587 spin_unlock(lock); 588 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 589 590 if (twp) { 591 *twp = tw; 592 } else if (tw) { 593 /* Silly. Should hash-dance instead... */ 594 inet_twsk_deschedule_put(tw); 595 } 596 return 0; 597 598not_unique: 599 spin_unlock(lock); 600 return -EADDRNOTAVAIL; 601} 602 603static u64 inet_sk_port_offset(const struct sock *sk) 604{ 605 const struct inet_sock *inet = inet_sk(sk); 606 607 return secure_ipv4_port_ephemeral(inet->inet_rcv_saddr, 608 inet->inet_daddr, 609 inet->inet_dport); 610} 611 612/* Searches for an exsiting socket in the ehash bucket list. 613 * Returns true if found, false otherwise. 614 */ 615static bool inet_ehash_lookup_by_sk(struct sock *sk, 616 struct hlist_nulls_head *list) 617{ 618 const __portpair ports = INET_COMBINED_PORTS(sk->sk_dport, sk->sk_num); 619 const int sdif = sk->sk_bound_dev_if; 620 const int dif = sk->sk_bound_dev_if; 621 const struct hlist_nulls_node *node; 622 struct net *net = sock_net(sk); 623 struct sock *esk; 624 625 INET_ADDR_COOKIE(acookie, sk->sk_daddr, sk->sk_rcv_saddr); 626 627 sk_nulls_for_each_rcu(esk, node, list) { 628 if (esk->sk_hash != sk->sk_hash) 629 continue; 630 if (sk->sk_family == AF_INET) { 631 if (unlikely(inet_match(net, esk, acookie, 632 ports, dif, sdif))) { 633 return true; 634 } 635 } 636#if IS_ENABLED(CONFIG_IPV6) 637 else if (sk->sk_family == AF_INET6) { 638 if (unlikely(inet6_match(net, esk, 639 &sk->sk_v6_daddr, 640 &sk->sk_v6_rcv_saddr, 641 ports, dif, sdif))) { 642 return true; 643 } 644 } 645#endif 646 } 647 return false; 648} 649 650/* Insert a socket into ehash, and eventually remove another one 651 * (The another one can be a SYN_RECV or TIMEWAIT) 652 * If an existing socket already exists, socket sk is not inserted, 653 * and sets found_dup_sk parameter to true. 654 */ 655bool inet_ehash_insert(struct sock *sk, struct sock *osk, bool *found_dup_sk) 656{ 657 struct inet_hashinfo *hashinfo = tcp_or_dccp_get_hashinfo(sk); 658 struct inet_ehash_bucket *head; 659 struct hlist_nulls_head *list; 660 spinlock_t *lock; 661 bool ret = true; 662 663 WARN_ON_ONCE(!sk_unhashed(sk)); 664 665 sk->sk_hash = sk_ehashfn(sk); 666 head = inet_ehash_bucket(hashinfo, sk->sk_hash); 667 list = &head->chain; 668 lock = inet_ehash_lockp(hashinfo, sk->sk_hash); 669 670 spin_lock(lock); 671 if (osk) { 672 WARN_ON_ONCE(sk->sk_hash != osk->sk_hash); 673 ret = sk_nulls_del_node_init_rcu(osk); 674 } else if (found_dup_sk) { 675 *found_dup_sk = inet_ehash_lookup_by_sk(sk, list); 676 if (*found_dup_sk) 677 ret = false; 678 } 679 680 if (ret) 681 __sk_nulls_add_node_rcu(sk, list); 682 683 spin_unlock(lock); 684 685 return ret; 686} 687 688bool inet_ehash_nolisten(struct sock *sk, struct sock *osk, bool *found_dup_sk) 689{ 690 bool ok = inet_ehash_insert(sk, osk, found_dup_sk); 691 692 if (ok) { 693 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 694 } else { 695 this_cpu_inc(*sk->sk_prot->orphan_count); 696 inet_sk_set_state(sk, TCP_CLOSE); 697 sock_set_flag(sk, SOCK_DEAD); 698 inet_csk_destroy_sock(sk); 699 } 700 return ok; 701} 702EXPORT_SYMBOL_GPL(inet_ehash_nolisten); 703 704static int inet_reuseport_add_sock(struct sock *sk, 705 struct inet_listen_hashbucket *ilb) 706{ 707 struct inet_bind_bucket *tb = inet_csk(sk)->icsk_bind_hash; 708 const struct hlist_nulls_node *node; 709 struct sock *sk2; 710 kuid_t uid = sock_i_uid(sk); 711 712 sk_nulls_for_each_rcu(sk2, node, &ilb->nulls_head) { 713 if (sk2 != sk && 714 sk2->sk_family == sk->sk_family && 715 ipv6_only_sock(sk2) == ipv6_only_sock(sk) && 716 sk2->sk_bound_dev_if == sk->sk_bound_dev_if && 717 inet_csk(sk2)->icsk_bind_hash == tb && 718 sk2->sk_reuseport && uid_eq(uid, sock_i_uid(sk2)) && 719 inet_rcv_saddr_equal(sk, sk2, false)) 720 return reuseport_add_sock(sk, sk2, 721 inet_rcv_saddr_any(sk)); 722 } 723 724 return reuseport_alloc(sk, inet_rcv_saddr_any(sk)); 725} 726 727int __inet_hash(struct sock *sk, struct sock *osk) 728{ 729 struct inet_hashinfo *hashinfo = tcp_or_dccp_get_hashinfo(sk); 730 struct inet_listen_hashbucket *ilb2; 731 int err = 0; 732 733 if (sk->sk_state != TCP_LISTEN) { 734 local_bh_disable(); 735 inet_ehash_nolisten(sk, osk, NULL); 736 local_bh_enable(); 737 return 0; 738 } 739 WARN_ON(!sk_unhashed(sk)); 740 ilb2 = inet_lhash2_bucket_sk(hashinfo, sk); 741 742 spin_lock(&ilb2->lock); 743 if (sk->sk_reuseport) { 744 err = inet_reuseport_add_sock(sk, ilb2); 745 if (err) 746 goto unlock; 747 } 748 sock_set_flag(sk, SOCK_RCU_FREE); 749 if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport && 750 sk->sk_family == AF_INET6) 751 __sk_nulls_add_node_tail_rcu(sk, &ilb2->nulls_head); 752 else 753 __sk_nulls_add_node_rcu(sk, &ilb2->nulls_head); 754 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 755unlock: 756 spin_unlock(&ilb2->lock); 757 758 return err; 759} 760EXPORT_SYMBOL(__inet_hash); 761 762int inet_hash(struct sock *sk) 763{ 764 int err = 0; 765 766 if (sk->sk_state != TCP_CLOSE) 767 err = __inet_hash(sk, NULL); 768 769 return err; 770} 771EXPORT_SYMBOL_GPL(inet_hash); 772 773void inet_unhash(struct sock *sk) 774{ 775 struct inet_hashinfo *hashinfo = tcp_or_dccp_get_hashinfo(sk); 776 777 if (sk_unhashed(sk)) 778 return; 779 780 if (sk->sk_state == TCP_LISTEN) { 781 struct inet_listen_hashbucket *ilb2; 782 783 ilb2 = inet_lhash2_bucket_sk(hashinfo, sk); 784 /* Don't disable bottom halves while acquiring the lock to 785 * avoid circular locking dependency on PREEMPT_RT. 786 */ 787 spin_lock(&ilb2->lock); 788 if (sk_unhashed(sk)) { 789 spin_unlock(&ilb2->lock); 790 return; 791 } 792 793 if (rcu_access_pointer(sk->sk_reuseport_cb)) 794 reuseport_stop_listen_sock(sk); 795 796 __sk_nulls_del_node_init_rcu(sk); 797 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 798 spin_unlock(&ilb2->lock); 799 } else { 800 spinlock_t *lock = inet_ehash_lockp(hashinfo, sk->sk_hash); 801 802 spin_lock_bh(lock); 803 if (sk_unhashed(sk)) { 804 spin_unlock_bh(lock); 805 return; 806 } 807 __sk_nulls_del_node_init_rcu(sk); 808 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 809 spin_unlock_bh(lock); 810 } 811} 812EXPORT_SYMBOL_GPL(inet_unhash); 813 814static bool inet_bind2_bucket_match(const struct inet_bind2_bucket *tb, 815 const struct net *net, unsigned short port, 816 int l3mdev, const struct sock *sk) 817{ 818 if (!net_eq(ib2_net(tb), net) || tb->port != port || 819 tb->l3mdev != l3mdev) 820 return false; 821 822 return inet_bind2_bucket_addr_match(tb, sk); 823} 824 825bool inet_bind2_bucket_match_addr_any(const struct inet_bind2_bucket *tb, const struct net *net, 826 unsigned short port, int l3mdev, const struct sock *sk) 827{ 828 if (!net_eq(ib2_net(tb), net) || tb->port != port || 829 tb->l3mdev != l3mdev) 830 return false; 831 832#if IS_ENABLED(CONFIG_IPV6) 833 if (tb->addr_type == IPV6_ADDR_ANY) 834 return true; 835 836 if (tb->addr_type != IPV6_ADDR_MAPPED) 837 return false; 838 839 if (sk->sk_family == AF_INET6 && 840 !ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) 841 return false; 842#endif 843 return tb->rcv_saddr == 0; 844} 845 846/* The socket's bhash2 hashbucket spinlock must be held when this is called */ 847struct inet_bind2_bucket * 848inet_bind2_bucket_find(const struct inet_bind_hashbucket *head, const struct net *net, 849 unsigned short port, int l3mdev, const struct sock *sk) 850{ 851 struct inet_bind2_bucket *bhash2 = NULL; 852 853 inet_bind_bucket_for_each(bhash2, &head->chain) 854 if (inet_bind2_bucket_match(bhash2, net, port, l3mdev, sk)) 855 break; 856 857 return bhash2; 858} 859 860struct inet_bind_hashbucket * 861inet_bhash2_addr_any_hashbucket(const struct sock *sk, const struct net *net, int port) 862{ 863 struct inet_hashinfo *hinfo = tcp_or_dccp_get_hashinfo(sk); 864 u32 hash; 865 866#if IS_ENABLED(CONFIG_IPV6) 867 if (sk->sk_family == AF_INET6) 868 hash = ipv6_portaddr_hash(net, &in6addr_any, port); 869 else 870#endif 871 hash = ipv4_portaddr_hash(net, 0, port); 872 873 return &hinfo->bhash2[hash & (hinfo->bhash_size - 1)]; 874} 875 876static void inet_update_saddr(struct sock *sk, void *saddr, int family) 877{ 878 if (family == AF_INET) { 879 inet_sk(sk)->inet_saddr = *(__be32 *)saddr; 880 sk_rcv_saddr_set(sk, inet_sk(sk)->inet_saddr); 881 } 882#if IS_ENABLED(CONFIG_IPV6) 883 else { 884 sk->sk_v6_rcv_saddr = *(struct in6_addr *)saddr; 885 } 886#endif 887} 888 889static int __inet_bhash2_update_saddr(struct sock *sk, void *saddr, int family, bool reset) 890{ 891 struct inet_hashinfo *hinfo = tcp_or_dccp_get_hashinfo(sk); 892 struct inet_bind_hashbucket *head, *head2; 893 struct inet_bind2_bucket *tb2, *new_tb2; 894 int l3mdev = inet_sk_bound_l3mdev(sk); 895 int port = inet_sk(sk)->inet_num; 896 struct net *net = sock_net(sk); 897 int bhash; 898 899 if (!inet_csk(sk)->icsk_bind2_hash) { 900 /* Not bind()ed before. */ 901 if (reset) 902 inet_reset_saddr(sk); 903 else 904 inet_update_saddr(sk, saddr, family); 905 906 return 0; 907 } 908 909 /* Allocate a bind2 bucket ahead of time to avoid permanently putting 910 * the bhash2 table in an inconsistent state if a new tb2 bucket 911 * allocation fails. 912 */ 913 new_tb2 = kmem_cache_alloc(hinfo->bind2_bucket_cachep, GFP_ATOMIC); 914 if (!new_tb2) { 915 if (reset) { 916 /* The (INADDR_ANY, port) bucket might have already 917 * been freed, then we cannot fixup icsk_bind2_hash, 918 * so we give up and unlink sk from bhash/bhash2 not 919 * to leave inconsistency in bhash2. 920 */ 921 inet_put_port(sk); 922 inet_reset_saddr(sk); 923 } 924 925 return -ENOMEM; 926 } 927 928 bhash = inet_bhashfn(net, port, hinfo->bhash_size); 929 head = &hinfo->bhash[bhash]; 930 head2 = inet_bhashfn_portaddr(hinfo, sk, net, port); 931 932 /* If we change saddr locklessly, another thread 933 * iterating over bhash might see corrupted address. 934 */ 935 spin_lock_bh(&head->lock); 936 937 spin_lock(&head2->lock); 938 __sk_del_bind_node(sk); 939 inet_bind2_bucket_destroy(hinfo->bind2_bucket_cachep, inet_csk(sk)->icsk_bind2_hash); 940 spin_unlock(&head2->lock); 941 942 if (reset) 943 inet_reset_saddr(sk); 944 else 945 inet_update_saddr(sk, saddr, family); 946 947 head2 = inet_bhashfn_portaddr(hinfo, sk, net, port); 948 949 spin_lock(&head2->lock); 950 tb2 = inet_bind2_bucket_find(head2, net, port, l3mdev, sk); 951 if (!tb2) { 952 tb2 = new_tb2; 953 inet_bind2_bucket_init(tb2, net, head2, inet_csk(sk)->icsk_bind_hash, sk); 954 } 955 inet_csk(sk)->icsk_bind2_hash = tb2; 956 sk_add_bind_node(sk, &tb2->owners); 957 spin_unlock(&head2->lock); 958 959 spin_unlock_bh(&head->lock); 960 961 if (tb2 != new_tb2) 962 kmem_cache_free(hinfo->bind2_bucket_cachep, new_tb2); 963 964 return 0; 965} 966 967int inet_bhash2_update_saddr(struct sock *sk, void *saddr, int family) 968{ 969 return __inet_bhash2_update_saddr(sk, saddr, family, false); 970} 971EXPORT_SYMBOL_GPL(inet_bhash2_update_saddr); 972 973void inet_bhash2_reset_saddr(struct sock *sk) 974{ 975 if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) 976 __inet_bhash2_update_saddr(sk, NULL, 0, true); 977} 978EXPORT_SYMBOL_GPL(inet_bhash2_reset_saddr); 979 980/* RFC 6056 3.3.4. Algorithm 4: Double-Hash Port Selection Algorithm 981 * Note that we use 32bit integers (vs RFC 'short integers') 982 * because 2^16 is not a multiple of num_ephemeral and this 983 * property might be used by clever attacker. 984 * 985 * RFC claims using TABLE_LENGTH=10 buckets gives an improvement, though 986 * attacks were since demonstrated, thus we use 65536 by default instead 987 * to really give more isolation and privacy, at the expense of 256kB 988 * of kernel memory. 989 */ 990#define INET_TABLE_PERTURB_SIZE (1 << CONFIG_INET_TABLE_PERTURB_ORDER) 991static u32 *table_perturb; 992 993int __inet_hash_connect(struct inet_timewait_death_row *death_row, 994 struct sock *sk, u64 port_offset, 995 int (*check_established)(struct inet_timewait_death_row *, 996 struct sock *, __u16, struct inet_timewait_sock **)) 997{ 998 struct inet_hashinfo *hinfo = death_row->hashinfo; 999 struct inet_bind_hashbucket *head, *head2; 1000 struct inet_timewait_sock *tw = NULL; 1001 int port = inet_sk(sk)->inet_num; 1002 struct net *net = sock_net(sk); 1003 struct inet_bind2_bucket *tb2; 1004 struct inet_bind_bucket *tb; 1005 bool tb_created = false; 1006 u32 remaining, offset; 1007 int ret, i, low, high; 1008 bool local_ports; 1009 int step, l3mdev; 1010 u32 index; 1011 1012 if (port) { 1013 local_bh_disable(); 1014 ret = check_established(death_row, sk, port, NULL); 1015 local_bh_enable(); 1016 return ret; 1017 } 1018 1019 l3mdev = inet_sk_bound_l3mdev(sk); 1020 1021 local_ports = inet_sk_get_local_port_range(sk, &low, &high); 1022 step = local_ports ? 1 : 2; 1023 1024 high++; /* [32768, 60999] -> [32768, 61000[ */ 1025 remaining = high - low; 1026 if (!local_ports && remaining > 1) 1027 remaining &= ~1U; 1028 1029 get_random_sleepable_once(table_perturb, 1030 INET_TABLE_PERTURB_SIZE * sizeof(*table_perturb)); 1031 index = port_offset & (INET_TABLE_PERTURB_SIZE - 1); 1032 1033 offset = READ_ONCE(table_perturb[index]) + (port_offset >> 32); 1034 offset %= remaining; 1035 1036 /* In first pass we try ports of @low parity. 1037 * inet_csk_get_port() does the opposite choice. 1038 */ 1039 if (!local_ports) 1040 offset &= ~1U; 1041other_parity_scan: 1042 port = low + offset; 1043 for (i = 0; i < remaining; i += step, port += step) { 1044 if (unlikely(port >= high)) 1045 port -= remaining; 1046 if (inet_is_local_reserved_port(net, port)) 1047 continue; 1048 head = &hinfo->bhash[inet_bhashfn(net, port, 1049 hinfo->bhash_size)]; 1050 spin_lock_bh(&head->lock); 1051 1052 /* Does not bother with rcv_saddr checks, because 1053 * the established check is already unique enough. 1054 */ 1055 inet_bind_bucket_for_each(tb, &head->chain) { 1056 if (inet_bind_bucket_match(tb, net, port, l3mdev)) { 1057 if (tb->fastreuse >= 0 || 1058 tb->fastreuseport >= 0) 1059 goto next_port; 1060 WARN_ON(hlist_empty(&tb->bhash2)); 1061 if (!check_established(death_row, sk, 1062 port, &tw)) 1063 goto ok; 1064 goto next_port; 1065 } 1066 } 1067 1068 tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep, 1069 net, head, port, l3mdev); 1070 if (!tb) { 1071 spin_unlock_bh(&head->lock); 1072 return -ENOMEM; 1073 } 1074 tb_created = true; 1075 tb->fastreuse = -1; 1076 tb->fastreuseport = -1; 1077 goto ok; 1078next_port: 1079 spin_unlock_bh(&head->lock); 1080 cond_resched(); 1081 } 1082 1083 if (!local_ports) { 1084 offset++; 1085 if ((offset & 1) && remaining > 1) 1086 goto other_parity_scan; 1087 } 1088 return -EADDRNOTAVAIL; 1089 1090ok: 1091 /* Find the corresponding tb2 bucket since we need to 1092 * add the socket to the bhash2 table as well 1093 */ 1094 head2 = inet_bhashfn_portaddr(hinfo, sk, net, port); 1095 spin_lock(&head2->lock); 1096 1097 tb2 = inet_bind2_bucket_find(head2, net, port, l3mdev, sk); 1098 if (!tb2) { 1099 tb2 = inet_bind2_bucket_create(hinfo->bind2_bucket_cachep, net, 1100 head2, tb, sk); 1101 if (!tb2) 1102 goto error; 1103 } 1104 1105 /* Here we want to add a little bit of randomness to the next source 1106 * port that will be chosen. We use a max() with a random here so that 1107 * on low contention the randomness is maximal and on high contention 1108 * it may be inexistent. 1109 */ 1110 i = max_t(int, i, get_random_u32_below(8) * step); 1111 WRITE_ONCE(table_perturb[index], READ_ONCE(table_perturb[index]) + i + step); 1112 1113 /* Head lock still held and bh's disabled */ 1114 inet_bind_hash(sk, tb, tb2, port); 1115 1116 if (sk_unhashed(sk)) { 1117 inet_sk(sk)->inet_sport = htons(port); 1118 inet_ehash_nolisten(sk, (struct sock *)tw, NULL); 1119 } 1120 if (tw) 1121 inet_twsk_bind_unhash(tw, hinfo); 1122 1123 spin_unlock(&head2->lock); 1124 spin_unlock(&head->lock); 1125 1126 if (tw) 1127 inet_twsk_deschedule_put(tw); 1128 local_bh_enable(); 1129 return 0; 1130 1131error: 1132 if (sk_hashed(sk)) { 1133 spinlock_t *lock = inet_ehash_lockp(hinfo, sk->sk_hash); 1134 1135 sock_prot_inuse_add(net, sk->sk_prot, -1); 1136 1137 spin_lock(lock); 1138 __sk_nulls_del_node_init_rcu(sk); 1139 spin_unlock(lock); 1140 1141 sk->sk_hash = 0; 1142 inet_sk(sk)->inet_sport = 0; 1143 inet_sk(sk)->inet_num = 0; 1144 1145 if (tw) 1146 inet_twsk_bind_unhash(tw, hinfo); 1147 } 1148 1149 spin_unlock(&head2->lock); 1150 if (tb_created) 1151 inet_bind_bucket_destroy(hinfo->bind_bucket_cachep, tb); 1152 spin_unlock(&head->lock); 1153 1154 if (tw) 1155 inet_twsk_deschedule_put(tw); 1156 1157 local_bh_enable(); 1158 1159 return -ENOMEM; 1160} 1161 1162/* 1163 * Bind a port for a connect operation and hash it. 1164 */ 1165int inet_hash_connect(struct inet_timewait_death_row *death_row, 1166 struct sock *sk) 1167{ 1168 u64 port_offset = 0; 1169 1170 if (!inet_sk(sk)->inet_num) 1171 port_offset = inet_sk_port_offset(sk); 1172 return __inet_hash_connect(death_row, sk, port_offset, 1173 __inet_check_established); 1174} 1175EXPORT_SYMBOL_GPL(inet_hash_connect); 1176 1177static void init_hashinfo_lhash2(struct inet_hashinfo *h) 1178{ 1179 int i; 1180 1181 for (i = 0; i <= h->lhash2_mask; i++) { 1182 spin_lock_init(&h->lhash2[i].lock); 1183 INIT_HLIST_NULLS_HEAD(&h->lhash2[i].nulls_head, 1184 i + LISTENING_NULLS_BASE); 1185 } 1186} 1187 1188void __init inet_hashinfo2_init(struct inet_hashinfo *h, const char *name, 1189 unsigned long numentries, int scale, 1190 unsigned long low_limit, 1191 unsigned long high_limit) 1192{ 1193 h->lhash2 = alloc_large_system_hash(name, 1194 sizeof(*h->lhash2), 1195 numentries, 1196 scale, 1197 0, 1198 NULL, 1199 &h->lhash2_mask, 1200 low_limit, 1201 high_limit); 1202 init_hashinfo_lhash2(h); 1203 1204 /* this one is used for source ports of outgoing connections */ 1205 table_perturb = alloc_large_system_hash("Table-perturb", 1206 sizeof(*table_perturb), 1207 INET_TABLE_PERTURB_SIZE, 1208 0, 0, NULL, NULL, 1209 INET_TABLE_PERTURB_SIZE, 1210 INET_TABLE_PERTURB_SIZE); 1211} 1212 1213int inet_hashinfo2_init_mod(struct inet_hashinfo *h) 1214{ 1215 h->lhash2 = kmalloc_array(INET_LHTABLE_SIZE, sizeof(*h->lhash2), GFP_KERNEL); 1216 if (!h->lhash2) 1217 return -ENOMEM; 1218 1219 h->lhash2_mask = INET_LHTABLE_SIZE - 1; 1220 /* INET_LHTABLE_SIZE must be a power of 2 */ 1221 BUG_ON(INET_LHTABLE_SIZE & h->lhash2_mask); 1222 1223 init_hashinfo_lhash2(h); 1224 return 0; 1225} 1226EXPORT_SYMBOL_GPL(inet_hashinfo2_init_mod); 1227 1228int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo) 1229{ 1230 unsigned int locksz = sizeof(spinlock_t); 1231 unsigned int i, nblocks = 1; 1232 1233 if (locksz != 0) { 1234 /* allocate 2 cache lines or at least one spinlock per cpu */ 1235 nblocks = max(2U * L1_CACHE_BYTES / locksz, 1U); 1236 nblocks = roundup_pow_of_two(nblocks * num_possible_cpus()); 1237 1238 /* no more locks than number of hash buckets */ 1239 nblocks = min(nblocks, hashinfo->ehash_mask + 1); 1240 1241 hashinfo->ehash_locks = kvmalloc_array(nblocks, locksz, GFP_KERNEL); 1242 if (!hashinfo->ehash_locks) 1243 return -ENOMEM; 1244 1245 for (i = 0; i < nblocks; i++) 1246 spin_lock_init(&hashinfo->ehash_locks[i]); 1247 } 1248 hashinfo->ehash_locks_mask = nblocks - 1; 1249 return 0; 1250} 1251EXPORT_SYMBOL_GPL(inet_ehash_locks_alloc); 1252 1253struct inet_hashinfo *inet_pernet_hashinfo_alloc(struct inet_hashinfo *hashinfo, 1254 unsigned int ehash_entries) 1255{ 1256 struct inet_hashinfo *new_hashinfo; 1257 int i; 1258 1259 new_hashinfo = kmemdup(hashinfo, sizeof(*hashinfo), GFP_KERNEL); 1260 if (!new_hashinfo) 1261 goto err; 1262 1263 new_hashinfo->ehash = vmalloc_huge(ehash_entries * sizeof(struct inet_ehash_bucket), 1264 GFP_KERNEL_ACCOUNT); 1265 if (!new_hashinfo->ehash) 1266 goto free_hashinfo; 1267 1268 new_hashinfo->ehash_mask = ehash_entries - 1; 1269 1270 if (inet_ehash_locks_alloc(new_hashinfo)) 1271 goto free_ehash; 1272 1273 for (i = 0; i < ehash_entries; i++) 1274 INIT_HLIST_NULLS_HEAD(&new_hashinfo->ehash[i].chain, i); 1275 1276 new_hashinfo->pernet = true; 1277 1278 return new_hashinfo; 1279 1280free_ehash: 1281 vfree(new_hashinfo->ehash); 1282free_hashinfo: 1283 kfree(new_hashinfo); 1284err: 1285 return NULL; 1286} 1287EXPORT_SYMBOL_GPL(inet_pernet_hashinfo_alloc); 1288 1289void inet_pernet_hashinfo_free(struct inet_hashinfo *hashinfo) 1290{ 1291 if (!hashinfo->pernet) 1292 return; 1293 1294 inet_ehash_locks_free(hashinfo); 1295 vfree(hashinfo->ehash); 1296 kfree(hashinfo); 1297} 1298EXPORT_SYMBOL_GPL(inet_pernet_hashinfo_free); 1299