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