treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 104
[sfrench/cifs-2.6.git] / 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");