net/sctp/protocol.c

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