1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* SCTP kernel implementation 3 * (C) Copyright IBM Corp. 2001, 2004 4 * Copyright (c) 1999-2000 Cisco, Inc. 5 * Copyright (c) 1999-2001 Motorola, Inc. 6 * Copyright (c) 2001 Intel Corp. 7 * Copyright (c) 2001 Nokia, Inc. 8 * Copyright (c) 2001 La Monte H.P. Yarroll 9 * 10 * This file is part of the SCTP kernel implementation 11 * 12 * Initialization/cleanup for SCTP protocol support. 13 * 14 * Please send any bug reports or fixes you make to the 15 * email address(es): 16 * lksctp developers <linux-sctp@vger.kernel.org> 17 * 18 * Written or modified by: 19 * La Monte H.P. Yarroll <piggy@acm.org> 20 * Karl Knutson <karl@athena.chicago.il.us> 21 * Jon Grimm <jgrimm@us.ibm.com> 22 * Sridhar Samudrala <sri@us.ibm.com> 23 * Daisy Chang <daisyc@us.ibm.com> 24 * Ardelle Fan <ardelle.fan@intel.com> 25 */ 26 27 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 28 29 #include <linux/module.h> 30 #include <linux/init.h> 31 #include <linux/netdevice.h> 32 #include <linux/inetdevice.h> 33 #include <linux/seq_file.h> 34 #include <linux/memblock.h> 35 #include <linux/highmem.h> 36 #include <linux/slab.h> 37 #include <net/net_namespace.h> 38 #include <net/protocol.h> 39 #include <net/ip.h> 40 #include <net/ipv6.h> 41 #include <net/route.h> 42 #include <net/sctp/sctp.h> 43 #include <net/addrconf.h> 44 #include <net/inet_common.h> 45 #include <net/inet_ecn.h> 46 #include <net/udp_tunnel.h> 47 #include <net/inet_dscp.h> 48 49 #define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024) 50 51 /* Global data structures. */ 52 struct sctp_globals sctp_globals __read_mostly; 53 54 struct idr sctp_assocs_id; 55 DEFINE_SPINLOCK(sctp_assocs_id_lock); 56 57 static struct sctp_pf *sctp_pf_inet6_specific; 58 static struct sctp_pf *sctp_pf_inet_specific; 59 static struct sctp_af *sctp_af_v4_specific; 60 static struct sctp_af *sctp_af_v6_specific; 61 62 struct kmem_cache *sctp_chunk_cachep __read_mostly; 63 struct kmem_cache *sctp_bucket_cachep __read_mostly; 64 65 long sysctl_sctp_mem[3]; 66 int sysctl_sctp_rmem[3]; 67 int sysctl_sctp_wmem[3]; 68 69 /* Private helper to extract ipv4 address and stash them in 70 * the protocol structure. 71 */ 72 static void sctp_v4_copy_addrlist(struct list_head *addrlist, 73 struct net_device *dev) 74 { 75 struct in_device *in_dev; 76 struct in_ifaddr *ifa; 77 struct sctp_sockaddr_entry *addr; 78 79 rcu_read_lock(); 80 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { 81 rcu_read_unlock(); 82 return; 83 } 84 85 in_dev_for_each_ifa_rcu(ifa, in_dev) { 86 /* Add the address to the local list. */ 87 addr = kzalloc(sizeof(*addr), GFP_ATOMIC); 88 if (addr) { 89 addr->a.v4.sin_family = AF_INET; 90 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 91 addr->valid = 1; 92 INIT_LIST_HEAD(&addr->list); 93 list_add_tail(&addr->list, addrlist); 94 } 95 } 96 97 rcu_read_unlock(); 98 } 99 100 /* Extract our IP addresses from the system and stash them in the 101 * protocol structure. 102 */ 103 static void sctp_get_local_addr_list(struct net *net) 104 { 105 struct net_device *dev; 106 struct list_head *pos; 107 struct sctp_af *af; 108 109 rcu_read_lock(); 110 for_each_netdev_rcu(net, dev) { 111 list_for_each(pos, &sctp_address_families) { 112 af = list_entry(pos, struct sctp_af, list); 113 af->copy_addrlist(&net->sctp.local_addr_list, dev); 114 } 115 } 116 rcu_read_unlock(); 117 } 118 119 /* Free the existing local addresses. */ 120 static void sctp_free_local_addr_list(struct net *net) 121 { 122 struct sctp_sockaddr_entry *addr; 123 struct list_head *pos, *temp; 124 125 list_for_each_safe(pos, temp, &net->sctp.local_addr_list) { 126 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 127 list_del(pos); 128 kfree(addr); 129 } 130 } 131 132 /* Copy the local addresses which are valid for 'scope' into 'bp'. */ 133 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp, 134 enum sctp_scope scope, gfp_t gfp, int copy_flags) 135 { 136 struct sctp_sockaddr_entry *addr; 137 union sctp_addr laddr; 138 int error = 0; 139 140 rcu_read_lock(); 141 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) { 142 if (!addr->valid) 143 continue; 144 if (!sctp_in_scope(net, &addr->a, scope)) 145 continue; 146 147 /* Now that the address is in scope, check to see if 148 * the address type is really supported by the local 149 * sock as well as the remote peer. 150 */ 151 if (addr->a.sa.sa_family == AF_INET && 152 (!(copy_flags & SCTP_ADDR4_ALLOWED) || 153 !(copy_flags & SCTP_ADDR4_PEERSUPP))) 154 continue; 155 if (addr->a.sa.sa_family == AF_INET6 && 156 (!(copy_flags & SCTP_ADDR6_ALLOWED) || 157 !(copy_flags & SCTP_ADDR6_PEERSUPP))) 158 continue; 159 160 laddr = addr->a; 161 /* also works for setting ipv6 address port */ 162 laddr.v4.sin_port = htons(bp->port); 163 if (sctp_bind_addr_state(bp, &laddr) != -1) 164 continue; 165 166 error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a), 167 SCTP_ADDR_SRC, GFP_ATOMIC); 168 if (error) 169 break; 170 } 171 172 rcu_read_unlock(); 173 return error; 174 } 175 176 /* Copy over any ip options */ 177 static void sctp_v4_copy_ip_options(struct sock *sk, struct sock *newsk) 178 { 179 struct inet_sock *newinet, *inet = inet_sk(sk); 180 struct ip_options_rcu *inet_opt, *newopt = NULL; 181 182 newinet = inet_sk(newsk); 183 184 rcu_read_lock(); 185 inet_opt = rcu_dereference(inet->inet_opt); 186 if (inet_opt) { 187 newopt = sock_kmalloc(newsk, sizeof(*inet_opt) + 188 inet_opt->opt.optlen, GFP_ATOMIC); 189 if (newopt) 190 memcpy(newopt, inet_opt, sizeof(*inet_opt) + 191 inet_opt->opt.optlen); 192 else 193 pr_err("%s: Failed to copy ip options\n", __func__); 194 } 195 RCU_INIT_POINTER(newinet->inet_opt, newopt); 196 rcu_read_unlock(); 197 } 198 199 /* Account for the IP options */ 200 static int sctp_v4_ip_options_len(struct sock *sk) 201 { 202 struct inet_sock *inet = inet_sk(sk); 203 struct ip_options_rcu *inet_opt; 204 int len = 0; 205 206 rcu_read_lock(); 207 inet_opt = rcu_dereference(inet->inet_opt); 208 if (inet_opt) 209 len = inet_opt->opt.optlen; 210 211 rcu_read_unlock(); 212 return len; 213 } 214 215 /* Initialize a sctp_addr from in incoming skb. */ 216 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, 217 int is_saddr) 218 { 219 /* Always called on head skb, so this is safe */ 220 struct sctphdr *sh = sctp_hdr(skb); 221 struct sockaddr_in *sa = &addr->v4; 222 223 addr->v4.sin_family = AF_INET; 224 225 if (is_saddr) { 226 sa->sin_port = sh->source; 227 sa->sin_addr.s_addr = ip_hdr(skb)->saddr; 228 } else { 229 sa->sin_port = sh->dest; 230 sa->sin_addr.s_addr = ip_hdr(skb)->daddr; 231 } 232 memset(sa->sin_zero, 0, sizeof(sa->sin_zero)); 233 } 234 235 /* Initialize an sctp_addr from a socket. */ 236 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) 237 { 238 addr->v4.sin_family = AF_INET; 239 addr->v4.sin_port = 0; 240 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr; 241 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero)); 242 } 243 244 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 245 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 246 { 247 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr; 248 } 249 250 /* Initialize sk->sk_daddr from sctp_addr. */ 251 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 252 { 253 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr; 254 } 255 256 /* Initialize a sctp_addr from an address parameter. */ 257 static bool sctp_v4_from_addr_param(union sctp_addr *addr, 258 union sctp_addr_param *param, 259 __be16 port, int iif) 260 { 261 if (ntohs(param->v4.param_hdr.length) < sizeof(struct sctp_ipv4addr_param)) 262 return false; 263 264 addr->v4.sin_family = AF_INET; 265 addr->v4.sin_port = port; 266 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; 267 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero)); 268 269 return true; 270 } 271 272 /* Initialize an address parameter from a sctp_addr and return the length 273 * of the address parameter. 274 */ 275 static int sctp_v4_to_addr_param(const union sctp_addr *addr, 276 union sctp_addr_param *param) 277 { 278 int length = sizeof(struct sctp_ipv4addr_param); 279 280 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; 281 param->v4.param_hdr.length = htons(length); 282 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; 283 284 return length; 285 } 286 287 /* Initialize a sctp_addr from a dst_entry. */ 288 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4, 289 __be16 port) 290 { 291 saddr->v4.sin_family = AF_INET; 292 saddr->v4.sin_port = port; 293 saddr->v4.sin_addr.s_addr = fl4->saddr; 294 memset(saddr->v4.sin_zero, 0, sizeof(saddr->v4.sin_zero)); 295 } 296 297 /* Compare two addresses exactly. */ 298 static int sctp_v4_cmp_addr(const union sctp_addr *addr1, 299 const union sctp_addr *addr2) 300 { 301 if (addr1->sa.sa_family != addr2->sa.sa_family) 302 return 0; 303 if (addr1->v4.sin_port != addr2->v4.sin_port) 304 return 0; 305 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) 306 return 0; 307 308 return 1; 309 } 310 311 /* Initialize addr struct to INADDR_ANY. */ 312 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) 313 { 314 addr->v4.sin_family = AF_INET; 315 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); 316 addr->v4.sin_port = port; 317 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero)); 318 } 319 320 /* Is this a wildcard address? */ 321 static int sctp_v4_is_any(const union sctp_addr *addr) 322 { 323 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; 324 } 325 326 /* This function checks if the address is a valid address to be used for 327 * SCTP binding. 328 * 329 * Output: 330 * Return 0 - If the address is a non-unicast or an illegal address. 331 * Return 1 - If the address is a unicast. 332 */ 333 static int sctp_v4_addr_valid(union sctp_addr *addr, 334 struct sctp_sock *sp, 335 const struct sk_buff *skb) 336 { 337 /* IPv4 addresses not allowed */ 338 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 339 return 0; 340 341 /* Is this a non-unicast address or a unusable SCTP address? */ 342 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) 343 return 0; 344 345 /* Is this a broadcast address? */ 346 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST) 347 return 0; 348 349 return 1; 350 } 351 352 /* Should this be available for binding? */ 353 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) 354 { 355 struct sock *sk = &sp->inet.sk; 356 struct net *net = sock_net(sk); 357 int tb_id = RT_TABLE_LOCAL; 358 int ret; 359 360 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ?: tb_id; 361 ret = inet_addr_type_table(net, addr->v4.sin_addr.s_addr, tb_id); 362 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && 363 ret != RTN_LOCAL && 364 !inet_test_bit(FREEBIND, sk) && 365 !READ_ONCE(net->ipv4.sysctl_ip_nonlocal_bind)) 366 return 0; 367 368 if (ipv6_only_sock(sctp_opt2sk(sp))) 369 return 0; 370 371 return 1; 372 } 373 374 /* Checking the loopback, private and other address scopes as defined in 375 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 376 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. 377 * 378 * Level 0 - unusable SCTP addresses 379 * Level 1 - loopback address 380 * Level 2 - link-local addresses 381 * Level 3 - private addresses. 382 * Level 4 - global addresses 383 * For INIT and INIT-ACK address list, let L be the level of 384 * requested destination address, sender and receiver 385 * SHOULD include all of its addresses with level greater 386 * than or equal to L. 387 * 388 * IPv4 scoping can be controlled through sysctl option 389 * net.sctp.addr_scope_policy 390 */ 391 static enum sctp_scope sctp_v4_scope(union sctp_addr *addr) 392 { 393 enum sctp_scope retval; 394 395 /* Check for unusable SCTP addresses. */ 396 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { 397 retval = SCTP_SCOPE_UNUSABLE; 398 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { 399 retval = SCTP_SCOPE_LOOPBACK; 400 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { 401 retval = SCTP_SCOPE_LINK; 402 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || 403 ipv4_is_private_172(addr->v4.sin_addr.s_addr) || 404 ipv4_is_private_192(addr->v4.sin_addr.s_addr) || 405 ipv4_is_test_198(addr->v4.sin_addr.s_addr)) { 406 retval = SCTP_SCOPE_PRIVATE; 407 } else { 408 retval = SCTP_SCOPE_GLOBAL; 409 } 410 411 return retval; 412 } 413 414 /* Returns a valid dst cache entry for the given source and destination ip 415 * addresses. If an association is passed, trys to get a dst entry with a 416 * source address that matches an address in the bind address list. 417 */ 418 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr, 419 struct flowi *fl, struct sock *sk) 420 { 421 struct sctp_association *asoc = t->asoc; 422 struct rtable *rt; 423 struct flowi _fl; 424 struct flowi4 *fl4 = &_fl.u.ip4; 425 struct sctp_bind_addr *bp; 426 struct sctp_sockaddr_entry *laddr; 427 struct dst_entry *dst = NULL; 428 union sctp_addr *daddr = &t->ipaddr; 429 union sctp_addr dst_saddr; 430 u8 tos = READ_ONCE(inet_sk(sk)->tos); 431 432 if (t->dscp & SCTP_DSCP_SET_MASK) 433 tos = t->dscp & SCTP_DSCP_VAL_MASK; 434 memset(&_fl, 0x0, sizeof(_fl)); 435 fl4->daddr = daddr->v4.sin_addr.s_addr; 436 fl4->fl4_dport = daddr->v4.sin_port; 437 fl4->flowi4_proto = IPPROTO_SCTP; 438 if (asoc) { 439 fl4->flowi4_tos = tos & INET_DSCP_MASK; 440 fl4->flowi4_scope = ip_sock_rt_scope(asoc->base.sk); 441 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if; 442 fl4->fl4_sport = htons(asoc->base.bind_addr.port); 443 } 444 if (saddr) { 445 fl4->saddr = saddr->v4.sin_addr.s_addr; 446 if (!fl4->fl4_sport) 447 fl4->fl4_sport = saddr->v4.sin_port; 448 } 449 450 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr, 451 &fl4->saddr); 452 453 rt = ip_route_output_key(sock_net(sk), fl4); 454 if (!IS_ERR(rt)) { 455 dst = &rt->dst; 456 t->dst = dst; 457 memcpy(fl, &_fl, sizeof(_fl)); 458 } 459 460 /* If there is no association or if a source address is passed, no 461 * more validation is required. 462 */ 463 if (!asoc || saddr) 464 goto out; 465 466 bp = &asoc->base.bind_addr; 467 468 if (dst) { 469 /* Walk through the bind address list and look for a bind 470 * address that matches the source address of the returned dst. 471 */ 472 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port)); 473 rcu_read_lock(); 474 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 475 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) || 476 (laddr->state != SCTP_ADDR_SRC && 477 !asoc->src_out_of_asoc_ok)) 478 continue; 479 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) 480 goto out_unlock; 481 } 482 rcu_read_unlock(); 483 484 /* None of the bound addresses match the source address of the 485 * dst. So release it. 486 */ 487 dst_release(dst); 488 dst = NULL; 489 } 490 491 /* Walk through the bind address list and try to get a dst that 492 * matches a bind address as the source address. 493 */ 494 rcu_read_lock(); 495 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 496 struct net_device *odev; 497 498 if (!laddr->valid) 499 continue; 500 if (laddr->state != SCTP_ADDR_SRC || 501 AF_INET != laddr->a.sa.sa_family) 502 continue; 503 504 fl4->fl4_sport = laddr->a.v4.sin_port; 505 flowi4_update_output(fl4, asoc->base.sk->sk_bound_dev_if, 506 daddr->v4.sin_addr.s_addr, 507 laddr->a.v4.sin_addr.s_addr); 508 509 rt = ip_route_output_key(sock_net(sk), fl4); 510 if (IS_ERR(rt)) 511 continue; 512 513 /* Ensure the src address belongs to the output 514 * interface. 515 */ 516 odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr, 517 false); 518 if (!odev || odev->ifindex != fl4->flowi4_oif) { 519 if (!dst) { 520 dst = &rt->dst; 521 t->dst = dst; 522 memcpy(fl, &_fl, sizeof(_fl)); 523 } else { 524 dst_release(&rt->dst); 525 } 526 continue; 527 } 528 529 dst_release(dst); 530 dst = &rt->dst; 531 t->dst = dst; 532 memcpy(fl, &_fl, sizeof(_fl)); 533 break; 534 } 535 536 out_unlock: 537 rcu_read_unlock(); 538 out: 539 if (dst) { 540 pr_debug("rt_dst:%pI4, rt_src:%pI4\n", 541 &fl->u.ip4.daddr, &fl->u.ip4.saddr); 542 } else { 543 t->dst = NULL; 544 pr_debug("no route\n"); 545 } 546 } 547 548 /* For v4, the source address is cached in the route entry(dst). So no need 549 * to cache it separately and hence this is an empty routine. 550 */ 551 static void sctp_v4_get_saddr(struct sctp_sock *sk, 552 struct sctp_transport *t, 553 struct flowi *fl) 554 { 555 union sctp_addr *saddr = &t->saddr; 556 struct rtable *rt = dst_rtable(t->dst); 557 558 if (rt) { 559 saddr->v4.sin_family = AF_INET; 560 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr; 561 } 562 } 563 564 /* What interface did this skb arrive on? */ 565 static int sctp_v4_skb_iif(const struct sk_buff *skb) 566 { 567 return inet_iif(skb); 568 } 569 570 static int sctp_v4_skb_sdif(const struct sk_buff *skb) 571 { 572 return inet_sdif(skb); 573 } 574 575 /* Was this packet marked by Explicit Congestion Notification? */ 576 static int sctp_v4_is_ce(const struct sk_buff *skb) 577 { 578 return INET_ECN_is_ce(ip_hdr(skb)->tos); 579 } 580 581 /* Create and initialize a new sk for the socket returned by accept(). */ 582 static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 583 struct sctp_association *asoc, 584 bool kern) 585 { 586 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, 587 sk->sk_prot, kern); 588 struct inet_sock *newinet; 589 590 if (!newsk) 591 goto out; 592 593 sock_init_data(NULL, newsk); 594 595 sctp_copy_sock(newsk, sk, asoc); 596 sock_reset_flag(newsk, SOCK_ZAPPED); 597 598 sctp_v4_copy_ip_options(sk, newsk); 599 600 newinet = inet_sk(newsk); 601 602 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; 603 604 if (newsk->sk_prot->init(newsk)) { 605 sk_common_release(newsk); 606 newsk = NULL; 607 } 608 609 out: 610 return newsk; 611 } 612 613 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr) 614 { 615 /* No address mapping for V4 sockets */ 616 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero)); 617 return sizeof(struct sockaddr_in); 618 } 619 620 /* Dump the v4 addr to the seq file. */ 621 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 622 { 623 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); 624 } 625 626 static void sctp_v4_ecn_capable(struct sock *sk) 627 { 628 INET_ECN_xmit(sk); 629 } 630 631 static void sctp_addr_wq_timeout_handler(struct timer_list *t) 632 { 633 struct net *net = from_timer(net, t, sctp.addr_wq_timer); 634 struct sctp_sockaddr_entry *addrw, *temp; 635 struct sctp_sock *sp; 636 637 spin_lock_bh(&net->sctp.addr_wq_lock); 638 639 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { 640 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at " 641 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa, 642 addrw->state, addrw); 643 644 #if IS_ENABLED(CONFIG_IPV6) 645 /* Now we send an ASCONF for each association */ 646 /* Note. we currently don't handle link local IPv6 addressees */ 647 if (addrw->a.sa.sa_family == AF_INET6) { 648 struct in6_addr *in6; 649 650 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) & 651 IPV6_ADDR_LINKLOCAL) 652 goto free_next; 653 654 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr; 655 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 && 656 addrw->state == SCTP_ADDR_NEW) { 657 unsigned long timeo_val; 658 659 pr_debug("%s: this is on DAD, trying %d sec " 660 "later\n", __func__, 661 SCTP_ADDRESS_TICK_DELAY); 662 663 timeo_val = jiffies; 664 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); 665 mod_timer(&net->sctp.addr_wq_timer, timeo_val); 666 break; 667 } 668 } 669 #endif 670 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) { 671 struct sock *sk; 672 673 sk = sctp_opt2sk(sp); 674 /* ignore bound-specific endpoints */ 675 if (!sctp_is_ep_boundall(sk)) 676 continue; 677 bh_lock_sock(sk); 678 if (sctp_asconf_mgmt(sp, addrw) < 0) 679 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__); 680 bh_unlock_sock(sk); 681 } 682 #if IS_ENABLED(CONFIG_IPV6) 683 free_next: 684 #endif 685 list_del(&addrw->list); 686 kfree(addrw); 687 } 688 spin_unlock_bh(&net->sctp.addr_wq_lock); 689 } 690 691 static void sctp_free_addr_wq(struct net *net) 692 { 693 struct sctp_sockaddr_entry *addrw; 694 struct sctp_sockaddr_entry *temp; 695 696 spin_lock_bh(&net->sctp.addr_wq_lock); 697 del_timer(&net->sctp.addr_wq_timer); 698 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { 699 list_del(&addrw->list); 700 kfree(addrw); 701 } 702 spin_unlock_bh(&net->sctp.addr_wq_lock); 703 } 704 705 /* lookup the entry for the same address in the addr_waitq 706 * sctp_addr_wq MUST be locked 707 */ 708 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net, 709 struct sctp_sockaddr_entry *addr) 710 { 711 struct sctp_sockaddr_entry *addrw; 712 713 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) { 714 if (addrw->a.sa.sa_family != addr->a.sa.sa_family) 715 continue; 716 if (addrw->a.sa.sa_family == AF_INET) { 717 if (addrw->a.v4.sin_addr.s_addr == 718 addr->a.v4.sin_addr.s_addr) 719 return addrw; 720 } else if (addrw->a.sa.sa_family == AF_INET6) { 721 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr, 722 &addr->a.v6.sin6_addr)) 723 return addrw; 724 } 725 } 726 return NULL; 727 } 728 729 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd) 730 { 731 struct sctp_sockaddr_entry *addrw; 732 unsigned long timeo_val; 733 734 /* first, we check if an opposite message already exist in the queue. 735 * If we found such message, it is removed. 736 * This operation is a bit stupid, but the DHCP client attaches the 737 * new address after a couple of addition and deletion of that address 738 */ 739 740 spin_lock_bh(&net->sctp.addr_wq_lock); 741 742 /* Avoid searching the queue or modifying it if there are no consumers, 743 * as it can lead to performance degradation if addresses are modified 744 * en-masse. 745 * 746 * If the queue already contains some events, update it anyway to avoid 747 * ugly races between new sessions and new address events. 748 */ 749 if (list_empty(&net->sctp.auto_asconf_splist) && 750 list_empty(&net->sctp.addr_waitq)) { 751 spin_unlock_bh(&net->sctp.addr_wq_lock); 752 return; 753 } 754 755 /* Offsets existing events in addr_wq */ 756 addrw = sctp_addr_wq_lookup(net, addr); 757 if (addrw) { 758 if (addrw->state != cmd) { 759 pr_debug("%s: offsets existing entry for %d, addr:%pISc " 760 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa, 761 &net->sctp.addr_waitq); 762 763 list_del(&addrw->list); 764 kfree(addrw); 765 } 766 spin_unlock_bh(&net->sctp.addr_wq_lock); 767 return; 768 } 769 770 /* OK, we have to add the new address to the wait queue */ 771 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 772 if (addrw == NULL) { 773 spin_unlock_bh(&net->sctp.addr_wq_lock); 774 return; 775 } 776 addrw->state = cmd; 777 list_add_tail(&addrw->list, &net->sctp.addr_waitq); 778 779 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n", 780 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq); 781 782 if (!timer_pending(&net->sctp.addr_wq_timer)) { 783 timeo_val = jiffies; 784 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); 785 mod_timer(&net->sctp.addr_wq_timer, timeo_val); 786 } 787 spin_unlock_bh(&net->sctp.addr_wq_lock); 788 } 789 790 /* Event handler for inet address addition/deletion events. 791 * The sctp_local_addr_list needs to be protocted by a spin lock since 792 * multiple notifiers (say IPv4 and IPv6) may be running at the same 793 * time and thus corrupt the list. 794 * The reader side is protected with RCU. 795 */ 796 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, 797 void *ptr) 798 { 799 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 800 struct sctp_sockaddr_entry *addr = NULL; 801 struct sctp_sockaddr_entry *temp; 802 struct net *net = dev_net(ifa->ifa_dev->dev); 803 int found = 0; 804 805 switch (ev) { 806 case NETDEV_UP: 807 addr = kzalloc(sizeof(*addr), GFP_ATOMIC); 808 if (addr) { 809 addr->a.v4.sin_family = AF_INET; 810 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 811 addr->valid = 1; 812 spin_lock_bh(&net->sctp.local_addr_lock); 813 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list); 814 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW); 815 spin_unlock_bh(&net->sctp.local_addr_lock); 816 } 817 break; 818 case NETDEV_DOWN: 819 spin_lock_bh(&net->sctp.local_addr_lock); 820 list_for_each_entry_safe(addr, temp, 821 &net->sctp.local_addr_list, list) { 822 if (addr->a.sa.sa_family == AF_INET && 823 addr->a.v4.sin_addr.s_addr == 824 ifa->ifa_local) { 825 found = 1; 826 addr->valid = 0; 827 list_del_rcu(&addr->list); 828 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL); 829 break; 830 } 831 } 832 spin_unlock_bh(&net->sctp.local_addr_lock); 833 if (found) 834 kfree_rcu(addr, rcu); 835 break; 836 } 837 838 return NOTIFY_DONE; 839 } 840 841 /* 842 * Initialize the control inode/socket with a control endpoint data 843 * structure. This endpoint is reserved exclusively for the OOTB processing. 844 */ 845 static int sctp_ctl_sock_init(struct net *net) 846 { 847 int err; 848 sa_family_t family = PF_INET; 849 850 if (sctp_get_pf_specific(PF_INET6)) 851 family = PF_INET6; 852 853 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family, 854 SOCK_SEQPACKET, IPPROTO_SCTP, net); 855 856 /* If IPv6 socket could not be created, try the IPv4 socket */ 857 if (err < 0 && family == PF_INET6) 858 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET, 859 SOCK_SEQPACKET, IPPROTO_SCTP, 860 net); 861 862 if (err < 0) { 863 pr_err("Failed to create the SCTP control socket\n"); 864 return err; 865 } 866 return 0; 867 } 868 869 static int sctp_udp_rcv(struct sock *sk, struct sk_buff *skb) 870 { 871 SCTP_INPUT_CB(skb)->encap_port = udp_hdr(skb)->source; 872 873 skb_set_transport_header(skb, sizeof(struct udphdr)); 874 sctp_rcv(skb); 875 return 0; 876 } 877 878 int sctp_udp_sock_start(struct net *net) 879 { 880 struct udp_tunnel_sock_cfg tuncfg = {NULL}; 881 struct udp_port_cfg udp_conf = {0}; 882 struct socket *sock; 883 int err; 884 885 udp_conf.family = AF_INET; 886 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 887 udp_conf.local_udp_port = htons(net->sctp.udp_port); 888 err = udp_sock_create(net, &udp_conf, &sock); 889 if (err) { 890 pr_err("Failed to create the SCTP UDP tunneling v4 sock\n"); 891 return err; 892 } 893 894 tuncfg.encap_type = 1; 895 tuncfg.encap_rcv = sctp_udp_rcv; 896 tuncfg.encap_err_lookup = sctp_udp_v4_err; 897 setup_udp_tunnel_sock(net, sock, &tuncfg); 898 net->sctp.udp4_sock = sock->sk; 899 900 #if IS_ENABLED(CONFIG_IPV6) 901 memset(&udp_conf, 0, sizeof(udp_conf)); 902 903 udp_conf.family = AF_INET6; 904 udp_conf.local_ip6 = in6addr_any; 905 udp_conf.local_udp_port = htons(net->sctp.udp_port); 906 udp_conf.use_udp6_rx_checksums = true; 907 udp_conf.ipv6_v6only = true; 908 err = udp_sock_create(net, &udp_conf, &sock); 909 if (err) { 910 pr_err("Failed to create the SCTP UDP tunneling v6 sock\n"); 911 udp_tunnel_sock_release(net->sctp.udp4_sock->sk_socket); 912 net->sctp.udp4_sock = NULL; 913 return err; 914 } 915 916 tuncfg.encap_type = 1; 917 tuncfg.encap_rcv = sctp_udp_rcv; 918 tuncfg.encap_err_lookup = sctp_udp_v6_err; 919 setup_udp_tunnel_sock(net, sock, &tuncfg); 920 net->sctp.udp6_sock = sock->sk; 921 #endif 922 923 return 0; 924 } 925 926 void sctp_udp_sock_stop(struct net *net) 927 { 928 if (net->sctp.udp4_sock) { 929 udp_tunnel_sock_release(net->sctp.udp4_sock->sk_socket); 930 net->sctp.udp4_sock = NULL; 931 } 932 if (net->sctp.udp6_sock) { 933 udp_tunnel_sock_release(net->sctp.udp6_sock->sk_socket); 934 net->sctp.udp6_sock = NULL; 935 } 936 } 937 938 /* Register address family specific functions. */ 939 int sctp_register_af(struct sctp_af *af) 940 { 941 switch (af->sa_family) { 942 case AF_INET: 943 if (sctp_af_v4_specific) 944 return 0; 945 sctp_af_v4_specific = af; 946 break; 947 case AF_INET6: 948 if (sctp_af_v6_specific) 949 return 0; 950 sctp_af_v6_specific = af; 951 break; 952 default: 953 return 0; 954 } 955 956 INIT_LIST_HEAD(&af->list); 957 list_add_tail(&af->list, &sctp_address_families); 958 return 1; 959 } 960 961 /* Get the table of functions for manipulating a particular address 962 * family. 963 */ 964 struct sctp_af *sctp_get_af_specific(sa_family_t family) 965 { 966 switch (family) { 967 case AF_INET: 968 return sctp_af_v4_specific; 969 case AF_INET6: 970 return sctp_af_v6_specific; 971 default: 972 return NULL; 973 } 974 } 975 976 /* Common code to initialize a AF_INET msg_name. */ 977 static void sctp_inet_msgname(char *msgname, int *addr_len) 978 { 979 struct sockaddr_in *sin; 980 981 sin = (struct sockaddr_in *)msgname; 982 *addr_len = sizeof(struct sockaddr_in); 983 sin->sin_family = AF_INET; 984 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 985 } 986 987 /* Copy the primary address of the peer primary address as the msg_name. */ 988 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, 989 int *addr_len) 990 { 991 struct sockaddr_in *sin, *sinfrom; 992 993 if (msgname) { 994 struct sctp_association *asoc; 995 996 asoc = event->asoc; 997 sctp_inet_msgname(msgname, addr_len); 998 sin = (struct sockaddr_in *)msgname; 999 sinfrom = &asoc->peer.primary_addr.v4; 1000 sin->sin_port = htons(asoc->peer.port); 1001 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; 1002 } 1003 } 1004 1005 /* Initialize and copy out a msgname from an inbound skb. */ 1006 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 1007 { 1008 if (msgname) { 1009 struct sctphdr *sh = sctp_hdr(skb); 1010 struct sockaddr_in *sin = (struct sockaddr_in *)msgname; 1011 1012 sctp_inet_msgname(msgname, len); 1013 sin->sin_port = sh->source; 1014 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 1015 } 1016 } 1017 1018 /* Do we support this AF? */ 1019 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 1020 { 1021 /* PF_INET only supports AF_INET addresses. */ 1022 return AF_INET == family; 1023 } 1024 1025 /* Address matching with wildcards allowed. */ 1026 static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 1027 const union sctp_addr *addr2, 1028 struct sctp_sock *opt) 1029 { 1030 /* PF_INET only supports AF_INET addresses. */ 1031 if (addr1->sa.sa_family != addr2->sa.sa_family) 1032 return 0; 1033 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || 1034 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) 1035 return 1; 1036 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 1037 return 1; 1038 1039 return 0; 1040 } 1041 1042 /* Verify that provided sockaddr looks bindable. Common verification has 1043 * already been taken care of. 1044 */ 1045 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 1046 { 1047 return sctp_v4_available(addr, opt); 1048 } 1049 1050 /* Verify that sockaddr looks sendable. Common verification has already 1051 * been taken care of. 1052 */ 1053 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 1054 { 1055 return 1; 1056 } 1057 1058 /* Fill in Supported Address Type information for INIT and INIT-ACK 1059 * chunks. Returns number of addresses supported. 1060 */ 1061 static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 1062 __be16 *types) 1063 { 1064 types[0] = SCTP_PARAM_IPV4_ADDRESS; 1065 return 1; 1066 } 1067 1068 /* Wrapper routine that calls the ip transmit routine. */ 1069 static inline int sctp_v4_xmit(struct sk_buff *skb, struct sctp_transport *t) 1070 { 1071 struct dst_entry *dst = dst_clone(t->dst); 1072 struct flowi4 *fl4 = &t->fl.u.ip4; 1073 struct sock *sk = skb->sk; 1074 struct inet_sock *inet = inet_sk(sk); 1075 __u8 dscp = READ_ONCE(inet->tos); 1076 __be16 df = 0; 1077 1078 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb, 1079 skb->len, &fl4->saddr, &fl4->daddr); 1080 1081 if (t->dscp & SCTP_DSCP_SET_MASK) 1082 dscp = t->dscp & SCTP_DSCP_VAL_MASK; 1083 1084 inet->pmtudisc = t->param_flags & SPP_PMTUD_ENABLE ? IP_PMTUDISC_DO 1085 : IP_PMTUDISC_DONT; 1086 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS); 1087 1088 if (!t->encap_port || !sctp_sk(sk)->udp_port) { 1089 skb_dst_set(skb, dst); 1090 return __ip_queue_xmit(sk, skb, &t->fl, dscp); 1091 } 1092 1093 if (skb_is_gso(skb)) 1094 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM; 1095 1096 if (ip_dont_fragment(sk, dst) && !skb->ignore_df) 1097 df = htons(IP_DF); 1098 1099 skb->encapsulation = 1; 1100 skb_reset_inner_mac_header(skb); 1101 skb_reset_inner_transport_header(skb); 1102 skb_set_inner_ipproto(skb, IPPROTO_SCTP); 1103 udp_tunnel_xmit_skb(dst_rtable(dst), sk, skb, fl4->saddr, 1104 fl4->daddr, dscp, ip4_dst_hoplimit(dst), df, 1105 sctp_sk(sk)->udp_port, t->encap_port, false, false); 1106 return 0; 1107 } 1108 1109 static struct sctp_af sctp_af_inet; 1110 1111 static struct sctp_pf sctp_pf_inet = { 1112 .event_msgname = sctp_inet_event_msgname, 1113 .skb_msgname = sctp_inet_skb_msgname, 1114 .af_supported = sctp_inet_af_supported, 1115 .cmp_addr = sctp_inet_cmp_addr, 1116 .bind_verify = sctp_inet_bind_verify, 1117 .send_verify = sctp_inet_send_verify, 1118 .supported_addrs = sctp_inet_supported_addrs, 1119 .create_accept_sk = sctp_v4_create_accept_sk, 1120 .addr_to_user = sctp_v4_addr_to_user, 1121 .to_sk_saddr = sctp_v4_to_sk_saddr, 1122 .to_sk_daddr = sctp_v4_to_sk_daddr, 1123 .copy_ip_options = sctp_v4_copy_ip_options, 1124 .af = &sctp_af_inet 1125 }; 1126 1127 /* Notifier for inetaddr addition/deletion events. */ 1128 static struct notifier_block sctp_inetaddr_notifier = { 1129 .notifier_call = sctp_inetaddr_event, 1130 }; 1131 1132 /* Socket operations. */ 1133 static const struct proto_ops inet_seqpacket_ops = { 1134 .family = PF_INET, 1135 .owner = THIS_MODULE, 1136 .release = inet_release, /* Needs to be wrapped... */ 1137 .bind = inet_bind, 1138 .connect = sctp_inet_connect, 1139 .socketpair = sock_no_socketpair, 1140 .accept = inet_accept, 1141 .getname = inet_getname, /* Semantics are different. */ 1142 .poll = sctp_poll, 1143 .ioctl = inet_ioctl, 1144 .gettstamp = sock_gettstamp, 1145 .listen = sctp_inet_listen, 1146 .shutdown = inet_shutdown, /* Looks harmless. */ 1147 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 1148 .getsockopt = sock_common_getsockopt, 1149 .sendmsg = inet_sendmsg, 1150 .recvmsg = inet_recvmsg, 1151 .mmap = sock_no_mmap, 1152 }; 1153 1154 /* Registration with AF_INET family. */ 1155 static struct inet_protosw sctp_seqpacket_protosw = { 1156 .type = SOCK_SEQPACKET, 1157 .protocol = IPPROTO_SCTP, 1158 .prot = &sctp_prot, 1159 .ops = &inet_seqpacket_ops, 1160 .flags = SCTP_PROTOSW_FLAG 1161 }; 1162 static struct inet_protosw sctp_stream_protosw = { 1163 .type = SOCK_STREAM, 1164 .protocol = IPPROTO_SCTP, 1165 .prot = &sctp_prot, 1166 .ops = &inet_seqpacket_ops, 1167 .flags = SCTP_PROTOSW_FLAG 1168 }; 1169 1170 static int sctp4_rcv(struct sk_buff *skb) 1171 { 1172 SCTP_INPUT_CB(skb)->encap_port = 0; 1173 return sctp_rcv(skb); 1174 } 1175 1176 /* Register with IP layer. */ 1177 static const struct net_protocol sctp_protocol = { 1178 .handler = sctp4_rcv, 1179 .err_handler = sctp_v4_err, 1180 .no_policy = 1, 1181 .icmp_strict_tag_validation = 1, 1182 }; 1183 1184 /* IPv4 address related functions. */ 1185 static struct sctp_af sctp_af_inet = { 1186 .sa_family = AF_INET, 1187 .sctp_xmit = sctp_v4_xmit, 1188 .setsockopt = ip_setsockopt, 1189 .getsockopt = ip_getsockopt, 1190 .get_dst = sctp_v4_get_dst, 1191 .get_saddr = sctp_v4_get_saddr, 1192 .copy_addrlist = sctp_v4_copy_addrlist, 1193 .from_skb = sctp_v4_from_skb, 1194 .from_sk = sctp_v4_from_sk, 1195 .from_addr_param = sctp_v4_from_addr_param, 1196 .to_addr_param = sctp_v4_to_addr_param, 1197 .cmp_addr = sctp_v4_cmp_addr, 1198 .addr_valid = sctp_v4_addr_valid, 1199 .inaddr_any = sctp_v4_inaddr_any, 1200 .is_any = sctp_v4_is_any, 1201 .available = sctp_v4_available, 1202 .scope = sctp_v4_scope, 1203 .skb_iif = sctp_v4_skb_iif, 1204 .skb_sdif = sctp_v4_skb_sdif, 1205 .is_ce = sctp_v4_is_ce, 1206 .seq_dump_addr = sctp_v4_seq_dump_addr, 1207 .ecn_capable = sctp_v4_ecn_capable, 1208 .net_header_len = sizeof(struct iphdr), 1209 .sockaddr_len = sizeof(struct sockaddr_in), 1210 .ip_options_len = sctp_v4_ip_options_len, 1211 }; 1212 1213 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) 1214 { 1215 switch (family) { 1216 case PF_INET: 1217 return sctp_pf_inet_specific; 1218 case PF_INET6: 1219 return sctp_pf_inet6_specific; 1220 default: 1221 return NULL; 1222 } 1223 } 1224 1225 /* Register the PF specific function table. */ 1226 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 1227 { 1228 switch (family) { 1229 case PF_INET: 1230 if (sctp_pf_inet_specific) 1231 return 0; 1232 sctp_pf_inet_specific = pf; 1233 break; 1234 case PF_INET6: 1235 if (sctp_pf_inet6_specific) 1236 return 0; 1237 sctp_pf_inet6_specific = pf; 1238 break; 1239 default: 1240 return 0; 1241 } 1242 return 1; 1243 } 1244 1245 static inline int init_sctp_mibs(struct net *net) 1246 { 1247 net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib); 1248 if (!net->sctp.sctp_statistics) 1249 return -ENOMEM; 1250 return 0; 1251 } 1252 1253 static inline void cleanup_sctp_mibs(struct net *net) 1254 { 1255 free_percpu(net->sctp.sctp_statistics); 1256 } 1257 1258 static void sctp_v4_pf_init(void) 1259 { 1260 /* Initialize the SCTP specific PF functions. */ 1261 sctp_register_pf(&sctp_pf_inet, PF_INET); 1262 sctp_register_af(&sctp_af_inet); 1263 } 1264 1265 static void sctp_v4_pf_exit(void) 1266 { 1267 list_del(&sctp_af_inet.list); 1268 } 1269 1270 static int sctp_v4_protosw_init(void) 1271 { 1272 int rc; 1273 1274 rc = proto_register(&sctp_prot, 1); 1275 if (rc) 1276 return rc; 1277 1278 /* Register SCTP(UDP and TCP style) with socket layer. */ 1279 inet_register_protosw(&sctp_seqpacket_protosw); 1280 inet_register_protosw(&sctp_stream_protosw); 1281 1282 return 0; 1283 } 1284 1285 static void sctp_v4_protosw_exit(void) 1286 { 1287 inet_unregister_protosw(&sctp_stream_protosw); 1288 inet_unregister_protosw(&sctp_seqpacket_protosw); 1289 proto_unregister(&sctp_prot); 1290 } 1291 1292 static int sctp_v4_add_protocol(void) 1293 { 1294 /* Register notifier for inet address additions/deletions. */ 1295 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1296 1297 /* Register SCTP with inet layer. */ 1298 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) 1299 return -EAGAIN; 1300 1301 return 0; 1302 } 1303 1304 static void sctp_v4_del_protocol(void) 1305 { 1306 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1307 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1308 } 1309 1310 static int __net_init sctp_defaults_init(struct net *net) 1311 { 1312 int status; 1313 1314 /* 1315 * 14. Suggested SCTP Protocol Parameter Values 1316 */ 1317 /* The following protocol parameters are RECOMMENDED: */ 1318 /* RTO.Initial - 3 seconds */ 1319 net->sctp.rto_initial = SCTP_RTO_INITIAL; 1320 /* RTO.Min - 1 second */ 1321 net->sctp.rto_min = SCTP_RTO_MIN; 1322 /* RTO.Max - 60 seconds */ 1323 net->sctp.rto_max = SCTP_RTO_MAX; 1324 /* RTO.Alpha - 1/8 */ 1325 net->sctp.rto_alpha = SCTP_RTO_ALPHA; 1326 /* RTO.Beta - 1/4 */ 1327 net->sctp.rto_beta = SCTP_RTO_BETA; 1328 1329 /* Valid.Cookie.Life - 60 seconds */ 1330 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1331 1332 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1333 net->sctp.cookie_preserve_enable = 1; 1334 1335 /* Default sctp sockets to use md5 as their hmac alg */ 1336 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5) 1337 net->sctp.sctp_hmac_alg = "md5"; 1338 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1) 1339 net->sctp.sctp_hmac_alg = "sha1"; 1340 #else 1341 net->sctp.sctp_hmac_alg = NULL; 1342 #endif 1343 1344 /* Max.Burst - 4 */ 1345 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST; 1346 1347 /* Disable of Primary Path Switchover by default */ 1348 net->sctp.ps_retrans = SCTP_PS_RETRANS_MAX; 1349 1350 /* Enable pf state by default */ 1351 net->sctp.pf_enable = 1; 1352 1353 /* Ignore pf exposure feature by default */ 1354 net->sctp.pf_expose = SCTP_PF_EXPOSE_UNSET; 1355 1356 /* Association.Max.Retrans - 10 attempts 1357 * Path.Max.Retrans - 5 attempts (per destination address) 1358 * Max.Init.Retransmits - 8 attempts 1359 */ 1360 net->sctp.max_retrans_association = 10; 1361 net->sctp.max_retrans_path = 5; 1362 net->sctp.max_retrans_init = 8; 1363 1364 /* Sendbuffer growth - do per-socket accounting */ 1365 net->sctp.sndbuf_policy = 0; 1366 1367 /* Rcvbuffer growth - do per-socket accounting */ 1368 net->sctp.rcvbuf_policy = 0; 1369 1370 /* HB.interval - 30 seconds */ 1371 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1372 1373 /* delayed SACK timeout */ 1374 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1375 1376 /* Disable ADDIP by default. */ 1377 net->sctp.addip_enable = 0; 1378 net->sctp.addip_noauth = 0; 1379 net->sctp.default_auto_asconf = 0; 1380 1381 /* Enable PR-SCTP by default. */ 1382 net->sctp.prsctp_enable = 1; 1383 1384 /* Disable RECONF by default. */ 1385 net->sctp.reconf_enable = 0; 1386 1387 /* Disable AUTH by default. */ 1388 net->sctp.auth_enable = 0; 1389 1390 /* Enable ECN by default. */ 1391 net->sctp.ecn_enable = 1; 1392 1393 /* Set UDP tunneling listening port to 0 by default */ 1394 net->sctp.udp_port = 0; 1395 1396 /* Set remote encap port to 0 by default */ 1397 net->sctp.encap_port = 0; 1398 1399 /* Set SCOPE policy to enabled */ 1400 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE; 1401 1402 /* Set the default rwnd update threshold */ 1403 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; 1404 1405 /* Initialize maximum autoclose timeout. */ 1406 net->sctp.max_autoclose = INT_MAX / HZ; 1407 1408 #ifdef CONFIG_NET_L3_MASTER_DEV 1409 net->sctp.l3mdev_accept = 1; 1410 #endif 1411 1412 status = sctp_sysctl_net_register(net); 1413 if (status) 1414 goto err_sysctl_register; 1415 1416 /* Allocate and initialise sctp mibs. */ 1417 status = init_sctp_mibs(net); 1418 if (status) 1419 goto err_init_mibs; 1420 1421 #ifdef CONFIG_PROC_FS 1422 /* Initialize proc fs directory. */ 1423 status = sctp_proc_init(net); 1424 if (status) 1425 goto err_init_proc; 1426 #endif 1427 1428 sctp_dbg_objcnt_init(net); 1429 1430 /* Initialize the local address list. */ 1431 INIT_LIST_HEAD(&net->sctp.local_addr_list); 1432 spin_lock_init(&net->sctp.local_addr_lock); 1433 sctp_get_local_addr_list(net); 1434 1435 /* Initialize the address event list */ 1436 INIT_LIST_HEAD(&net->sctp.addr_waitq); 1437 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist); 1438 spin_lock_init(&net->sctp.addr_wq_lock); 1439 net->sctp.addr_wq_timer.expires = 0; 1440 timer_setup(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, 0); 1441 1442 return 0; 1443 1444 #ifdef CONFIG_PROC_FS 1445 err_init_proc: 1446 cleanup_sctp_mibs(net); 1447 #endif 1448 err_init_mibs: 1449 sctp_sysctl_net_unregister(net); 1450 err_sysctl_register: 1451 return status; 1452 } 1453 1454 static void __net_exit sctp_defaults_exit(struct net *net) 1455 { 1456 /* Free the local address list */ 1457 sctp_free_addr_wq(net); 1458 sctp_free_local_addr_list(net); 1459 1460 #ifdef CONFIG_PROC_FS 1461 remove_proc_subtree("sctp", net->proc_net); 1462 net->sctp.proc_net_sctp = NULL; 1463 #endif 1464 cleanup_sctp_mibs(net); 1465 sctp_sysctl_net_unregister(net); 1466 } 1467 1468 static struct pernet_operations sctp_defaults_ops = { 1469 .init = sctp_defaults_init, 1470 .exit = sctp_defaults_exit, 1471 }; 1472 1473 static int __net_init sctp_ctrlsock_init(struct net *net) 1474 { 1475 int status; 1476 1477 /* Initialize the control inode/socket for handling OOTB packets. */ 1478 status = sctp_ctl_sock_init(net); 1479 if (status) 1480 pr_err("Failed to initialize the SCTP control sock\n"); 1481 1482 return status; 1483 } 1484 1485 static void __net_exit sctp_ctrlsock_exit(struct net *net) 1486 { 1487 /* Free the control endpoint. */ 1488 inet_ctl_sock_destroy(net->sctp.ctl_sock); 1489 } 1490 1491 static struct pernet_operations sctp_ctrlsock_ops = { 1492 .init = sctp_ctrlsock_init, 1493 .exit = sctp_ctrlsock_exit, 1494 }; 1495 1496 /* Initialize the universe into something sensible. */ 1497 static __init int sctp_init(void) 1498 { 1499 unsigned long nr_pages = totalram_pages(); 1500 unsigned long limit; 1501 unsigned long goal; 1502 int max_entry_order; 1503 int num_entries; 1504 int max_share; 1505 int status; 1506 int order; 1507 int i; 1508 1509 sock_skb_cb_check_size(sizeof(struct sctp_ulpevent)); 1510 1511 /* Allocate bind_bucket and chunk caches. */ 1512 status = -ENOBUFS; 1513 sctp_bucket_cachep = KMEM_CACHE(sctp_bind_bucket, SLAB_HWCACHE_ALIGN); 1514 if (!sctp_bucket_cachep) 1515 goto out; 1516 1517 sctp_chunk_cachep = KMEM_CACHE(sctp_chunk, SLAB_HWCACHE_ALIGN); 1518 if (!sctp_chunk_cachep) 1519 goto err_chunk_cachep; 1520 1521 status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL); 1522 if (status) 1523 goto err_percpu_counter_init; 1524 1525 /* Implementation specific variables. */ 1526 1527 /* Initialize default stream count setup information. */ 1528 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1529 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1530 1531 /* Initialize handle used for association ids. */ 1532 idr_init(&sctp_assocs_id); 1533 1534 limit = nr_free_buffer_pages() / 8; 1535 limit = max(limit, 128UL); 1536 sysctl_sctp_mem[0] = limit / 4 * 3; 1537 sysctl_sctp_mem[1] = limit; 1538 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; 1539 1540 /* Set per-socket limits to no more than 1/128 the pressure threshold*/ 1541 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); 1542 max_share = min(4UL*1024*1024, limit); 1543 1544 sysctl_sctp_rmem[0] = PAGE_SIZE; /* give each asoc 1 page min */ 1545 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1); 1546 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); 1547 1548 sysctl_sctp_wmem[0] = PAGE_SIZE; 1549 sysctl_sctp_wmem[1] = 16*1024; 1550 sysctl_sctp_wmem[2] = max(64*1024, max_share); 1551 1552 /* Size and allocate the association hash table. 1553 * The methodology is similar to that of the tcp hash tables. 1554 * Though not identical. Start by getting a goal size 1555 */ 1556 if (nr_pages >= (128 * 1024)) 1557 goal = nr_pages >> (22 - PAGE_SHIFT); 1558 else 1559 goal = nr_pages >> (24 - PAGE_SHIFT); 1560 1561 /* Then compute the page order for said goal */ 1562 order = get_order(goal); 1563 1564 /* Now compute the required page order for the maximum sized table we 1565 * want to create 1566 */ 1567 max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES * 1568 sizeof(struct sctp_bind_hashbucket)); 1569 1570 /* Limit the page order by that maximum hash table size */ 1571 order = min(order, max_entry_order); 1572 1573 /* Allocate and initialize the endpoint hash table. */ 1574 sctp_ep_hashsize = 64; 1575 sctp_ep_hashtable = 1576 kmalloc_array(64, sizeof(struct sctp_hashbucket), GFP_KERNEL); 1577 if (!sctp_ep_hashtable) { 1578 pr_err("Failed endpoint_hash alloc\n"); 1579 status = -ENOMEM; 1580 goto err_ehash_alloc; 1581 } 1582 for (i = 0; i < sctp_ep_hashsize; i++) { 1583 rwlock_init(&sctp_ep_hashtable[i].lock); 1584 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); 1585 } 1586 1587 /* Allocate and initialize the SCTP port hash table. 1588 * Note that order is initalized to start at the max sized 1589 * table we want to support. If we can't get that many pages 1590 * reduce the order and try again 1591 */ 1592 do { 1593 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1594 __get_free_pages(GFP_KERNEL | __GFP_NOWARN, order); 1595 } while (!sctp_port_hashtable && --order > 0); 1596 1597 if (!sctp_port_hashtable) { 1598 pr_err("Failed bind hash alloc\n"); 1599 status = -ENOMEM; 1600 goto err_bhash_alloc; 1601 } 1602 1603 /* Now compute the number of entries that will fit in the 1604 * port hash space we allocated 1605 */ 1606 num_entries = (1UL << order) * PAGE_SIZE / 1607 sizeof(struct sctp_bind_hashbucket); 1608 1609 /* And finish by rounding it down to the nearest power of two. 1610 * This wastes some memory of course, but it's needed because 1611 * the hash function operates based on the assumption that 1612 * the number of entries is a power of two. 1613 */ 1614 sctp_port_hashsize = rounddown_pow_of_two(num_entries); 1615 1616 for (i = 0; i < sctp_port_hashsize; i++) { 1617 spin_lock_init(&sctp_port_hashtable[i].lock); 1618 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); 1619 } 1620 1621 status = sctp_transport_hashtable_init(); 1622 if (status) 1623 goto err_thash_alloc; 1624 1625 pr_info("Hash tables configured (bind %d/%d)\n", sctp_port_hashsize, 1626 num_entries); 1627 1628 sctp_sysctl_register(); 1629 1630 INIT_LIST_HEAD(&sctp_address_families); 1631 sctp_v4_pf_init(); 1632 sctp_v6_pf_init(); 1633 sctp_sched_ops_init(); 1634 1635 status = register_pernet_subsys(&sctp_defaults_ops); 1636 if (status) 1637 goto err_register_defaults; 1638 1639 status = sctp_v4_protosw_init(); 1640 if (status) 1641 goto err_protosw_init; 1642 1643 status = sctp_v6_protosw_init(); 1644 if (status) 1645 goto err_v6_protosw_init; 1646 1647 status = register_pernet_subsys(&sctp_ctrlsock_ops); 1648 if (status) 1649 goto err_register_ctrlsock; 1650 1651 status = sctp_v4_add_protocol(); 1652 if (status) 1653 goto err_add_protocol; 1654 1655 /* Register SCTP with inet6 layer. */ 1656 status = sctp_v6_add_protocol(); 1657 if (status) 1658 goto err_v6_add_protocol; 1659 1660 if (sctp_offload_init() < 0) 1661 pr_crit("%s: Cannot add SCTP protocol offload\n", __func__); 1662 1663 out: 1664 return status; 1665 err_v6_add_protocol: 1666 sctp_v4_del_protocol(); 1667 err_add_protocol: 1668 unregister_pernet_subsys(&sctp_ctrlsock_ops); 1669 err_register_ctrlsock: 1670 sctp_v6_protosw_exit(); 1671 err_v6_protosw_init: 1672 sctp_v4_protosw_exit(); 1673 err_protosw_init: 1674 unregister_pernet_subsys(&sctp_defaults_ops); 1675 err_register_defaults: 1676 sctp_v4_pf_exit(); 1677 sctp_v6_pf_exit(); 1678 sctp_sysctl_unregister(); 1679 free_pages((unsigned long)sctp_port_hashtable, 1680 get_order(sctp_port_hashsize * 1681 sizeof(struct sctp_bind_hashbucket))); 1682 err_bhash_alloc: 1683 sctp_transport_hashtable_destroy(); 1684 err_thash_alloc: 1685 kfree(sctp_ep_hashtable); 1686 err_ehash_alloc: 1687 percpu_counter_destroy(&sctp_sockets_allocated); 1688 err_percpu_counter_init: 1689 kmem_cache_destroy(sctp_chunk_cachep); 1690 err_chunk_cachep: 1691 kmem_cache_destroy(sctp_bucket_cachep); 1692 goto out; 1693 } 1694 1695 /* Exit handler for the SCTP protocol. */ 1696 static __exit void sctp_exit(void) 1697 { 1698 /* BUG. This should probably do something useful like clean 1699 * up all the remaining associations and all that memory. 1700 */ 1701 1702 /* Unregister with inet6/inet layers. */ 1703 sctp_v6_del_protocol(); 1704 sctp_v4_del_protocol(); 1705 1706 unregister_pernet_subsys(&sctp_ctrlsock_ops); 1707 1708 /* Free protosw registrations */ 1709 sctp_v6_protosw_exit(); 1710 sctp_v4_protosw_exit(); 1711 1712 unregister_pernet_subsys(&sctp_defaults_ops); 1713 1714 /* Unregister with socket layer. */ 1715 sctp_v6_pf_exit(); 1716 sctp_v4_pf_exit(); 1717 1718 sctp_sysctl_unregister(); 1719 1720 free_pages((unsigned long)sctp_port_hashtable, 1721 get_order(sctp_port_hashsize * 1722 sizeof(struct sctp_bind_hashbucket))); 1723 kfree(sctp_ep_hashtable); 1724 sctp_transport_hashtable_destroy(); 1725 1726 percpu_counter_destroy(&sctp_sockets_allocated); 1727 1728 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1729 1730 kmem_cache_destroy(sctp_chunk_cachep); 1731 kmem_cache_destroy(sctp_bucket_cachep); 1732 } 1733 1734 module_init(sctp_init); 1735 module_exit(sctp_exit); 1736 1737 /* 1738 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1739 */ 1740 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1741 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1742 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>"); 1743 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1744 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); 1745 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); 1746 MODULE_LICENSE("GPL"); 1747