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defconfig: exynos9610: Re-add dropped Wi-Fi AP options lost
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / net / sctp / ipv6.c
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1/* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2002, 2004
3 * Copyright (c) 2001 Nokia, Inc.
4 * Copyright (c) 2001 La Monte H.P. Yarroll
5 * Copyright (c) 2002-2003 Intel Corp.
6 *
7 * This file is part of the SCTP kernel implementation
8 *
9 * SCTP over IPv6.
10 *
11 * This SCTP implementation is free software;
12 * you can redistribute it and/or modify it under the terms of
13 * the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 * This SCTP implementation is distributed in the hope that it
18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
19 * ************************
20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
21 * See the GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with GNU CC; see the file COPYING. If not, see
25 * <http://www.gnu.org/licenses/>.
26 *
27 * Please send any bug reports or fixes you make to the
28 * email address(es):
29 * lksctp developers <linux-sctp@vger.kernel.org>
30 *
31 * Written or modified by:
32 * Le Yanqun <yanqun.le@nokia.com>
33 * Hui Huang <hui.huang@nokia.com>
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Sridhar Samudrala <sri@us.ibm.com>
36 * Jon Grimm <jgrimm@us.ibm.com>
37 * Ardelle Fan <ardelle.fan@intel.com>
38 *
39 * Based on:
40 * linux/net/ipv6/tcp_ipv6.c
41 */
42
43#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
44
45#include <linux/module.h>
46#include <linux/errno.h>
47#include <linux/types.h>
48#include <linux/socket.h>
49#include <linux/sockios.h>
50#include <linux/net.h>
51#include <linux/in.h>
52#include <linux/in6.h>
53#include <linux/netdevice.h>
54#include <linux/init.h>
55#include <linux/ipsec.h>
56#include <linux/slab.h>
57
58#include <linux/ipv6.h>
59#include <linux/icmpv6.h>
60#include <linux/random.h>
61#include <linux/seq_file.h>
62
63#include <net/protocol.h>
64#include <net/ndisc.h>
65#include <net/ip.h>
66#include <net/ipv6.h>
67#include <net/transp_v6.h>
68#include <net/addrconf.h>
69#include <net/ip6_route.h>
70#include <net/inet_common.h>
71#include <net/inet_ecn.h>
72#include <net/sctp/sctp.h>
73
74#include <linux/uaccess.h>
75
76static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
77 union sctp_addr *s2);
78static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
79 __be16 port);
80static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
81 const union sctp_addr *addr2);
82
83/* Event handler for inet6 address addition/deletion events.
84 * The sctp_local_addr_list needs to be protocted by a spin lock since
85 * multiple notifiers (say IPv4 and IPv6) may be running at the same
86 * time and thus corrupt the list.
87 * The reader side is protected with RCU.
88 */
89static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
90 void *ptr)
91{
92 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
93 struct sctp_sockaddr_entry *addr = NULL;
94 struct sctp_sockaddr_entry *temp;
95 struct net *net = dev_net(ifa->idev->dev);
96 int found = 0;
97
98 switch (ev) {
99 case NETDEV_UP:
100 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
101 if (addr) {
102 addr->a.v6.sin6_family = AF_INET6;
103 addr->a.v6.sin6_addr = ifa->addr;
104 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
105 addr->valid = 1;
106 spin_lock_bh(&net->sctp.local_addr_lock);
107 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
108 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
109 spin_unlock_bh(&net->sctp.local_addr_lock);
110 }
111 break;
112 case NETDEV_DOWN:
113 spin_lock_bh(&net->sctp.local_addr_lock);
114 list_for_each_entry_safe(addr, temp,
115 &net->sctp.local_addr_list, list) {
116 if (addr->a.sa.sa_family == AF_INET6 &&
117 ipv6_addr_equal(&addr->a.v6.sin6_addr,
118 &ifa->addr)) {
119 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
120 found = 1;
121 addr->valid = 0;
122 list_del_rcu(&addr->list);
123 break;
124 }
125 }
126 spin_unlock_bh(&net->sctp.local_addr_lock);
127 if (found)
128 kfree_rcu(addr, rcu);
129 break;
130 }
131
132 return NOTIFY_DONE;
133}
134
135static struct notifier_block sctp_inet6addr_notifier = {
136 .notifier_call = sctp_inet6addr_event,
137};
138
139/* ICMP error handler. */
140static void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
141 u8 type, u8 code, int offset, __be32 info)
142{
143 struct inet6_dev *idev;
144 struct sock *sk;
145 struct sctp_association *asoc;
146 struct sctp_transport *transport;
147 struct ipv6_pinfo *np;
148 __u16 saveip, savesctp;
149 int err;
150 struct net *net = dev_net(skb->dev);
151
152 idev = in6_dev_get(skb->dev);
153
154 /* Fix up skb to look at the embedded net header. */
155 saveip = skb->network_header;
156 savesctp = skb->transport_header;
157 skb_reset_network_header(skb);
158 skb_set_transport_header(skb, offset);
159 sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
160 /* Put back, the original pointers. */
161 skb->network_header = saveip;
162 skb->transport_header = savesctp;
163 if (!sk) {
164 __ICMP6_INC_STATS(net, idev, ICMP6_MIB_INERRORS);
165 goto out;
166 }
167
168 /* Warning: The sock lock is held. Remember to call
169 * sctp_err_finish!
170 */
171
172 switch (type) {
173 case ICMPV6_PKT_TOOBIG:
174 if (ip6_sk_accept_pmtu(sk))
175 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
176 goto out_unlock;
177 case ICMPV6_PARAMPROB:
178 if (ICMPV6_UNK_NEXTHDR == code) {
179 sctp_icmp_proto_unreachable(sk, asoc, transport);
180 goto out_unlock;
181 }
182 break;
183 case NDISC_REDIRECT:
184 sctp_icmp_redirect(sk, transport, skb);
185 goto out_unlock;
186 default:
187 break;
188 }
189
190 np = inet6_sk(sk);
191 icmpv6_err_convert(type, code, &err);
192 if (!sock_owned_by_user(sk) && np->recverr) {
193 sk->sk_err = err;
194 sk->sk_error_report(sk);
195 } else { /* Only an error on timeout */
196 sk->sk_err_soft = err;
197 }
198
199out_unlock:
200 sctp_err_finish(sk, transport);
201out:
202 if (likely(idev != NULL))
203 in6_dev_put(idev);
204}
205
206static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
207{
208 struct sock *sk = skb->sk;
209 struct ipv6_pinfo *np = inet6_sk(sk);
210 struct flowi6 *fl6 = &transport->fl.u.ip6;
211 int res;
212
213 pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
214 skb->len, &fl6->saddr, &fl6->daddr);
215
216 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
217
218 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
219 skb->ignore_df = 1;
220
221 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
222
223 rcu_read_lock();
224 res = ip6_xmit(sk, skb, fl6, sk->sk_mark, rcu_dereference(np->opt),
225 np->tclass);
226 rcu_read_unlock();
227 return res;
228}
229
230/* Returns the dst cache entry for the given source and destination ip
231 * addresses.
232 */
233static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
234 struct flowi *fl, struct sock *sk)
235{
236 struct sctp_association *asoc = t->asoc;
237 struct dst_entry *dst = NULL;
238 struct flowi6 *fl6 = &fl->u.ip6;
239 struct sctp_bind_addr *bp;
240 struct ipv6_pinfo *np = inet6_sk(sk);
241 struct sctp_sockaddr_entry *laddr;
242 union sctp_addr *daddr = &t->ipaddr;
243 union sctp_addr dst_saddr;
244 struct in6_addr *final_p, final;
245 enum sctp_scope scope;
246 __u8 matchlen = 0;
247
248 memset(fl6, 0, sizeof(struct flowi6));
249 fl6->daddr = daddr->v6.sin6_addr;
250 fl6->fl6_dport = daddr->v6.sin6_port;
251 fl6->flowi6_proto = IPPROTO_SCTP;
252 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
253 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
254 else if (asoc)
255 fl6->flowi6_oif = asoc->base.sk->sk_bound_dev_if;
256
257 pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
258
259 if (asoc)
260 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
261
262 if (saddr) {
263 fl6->saddr = saddr->v6.sin6_addr;
264 fl6->fl6_sport = saddr->v6.sin6_port;
265
266 pr_debug("src=%pI6 - ", &fl6->saddr);
267 }
268
269 rcu_read_lock();
270 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
271 rcu_read_unlock();
272
273 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
274 if (!asoc || saddr)
275 goto out;
276
277 bp = &asoc->base.bind_addr;
278 scope = sctp_scope(daddr);
279 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
280 * to see if we can use it.
281 */
282 if (!IS_ERR(dst)) {
283 /* Walk through the bind address list and look for a bind
284 * address that matches the source address of the returned dst.
285 */
286 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
287 rcu_read_lock();
288 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
289 if (!laddr->valid || laddr->state == SCTP_ADDR_DEL ||
290 (laddr->state != SCTP_ADDR_SRC &&
291 !asoc->src_out_of_asoc_ok))
292 continue;
293
294 /* Do not compare against v4 addrs */
295 if ((laddr->a.sa.sa_family == AF_INET6) &&
296 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
297 rcu_read_unlock();
298 goto out;
299 }
300 }
301 rcu_read_unlock();
302 /* None of the bound addresses match the source address of the
303 * dst. So release it.
304 */
305 dst_release(dst);
306 dst = NULL;
307 }
308
309 /* Walk through the bind address list and try to get the
310 * best source address for a given destination.
311 */
312 rcu_read_lock();
313 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
314 struct dst_entry *bdst;
315 __u8 bmatchlen;
316
317 if (!laddr->valid ||
318 laddr->state != SCTP_ADDR_SRC ||
319 laddr->a.sa.sa_family != AF_INET6 ||
320 scope > sctp_scope(&laddr->a))
321 continue;
322
323 fl6->saddr = laddr->a.v6.sin6_addr;
324 fl6->fl6_sport = laddr->a.v6.sin6_port;
325 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
326 bdst = ip6_dst_lookup_flow(sk, fl6, final_p);
327
328 if (IS_ERR(bdst))
329 continue;
330
331 if (ipv6_chk_addr(dev_net(bdst->dev),
332 &laddr->a.v6.sin6_addr, bdst->dev, 1)) {
333 if (!IS_ERR_OR_NULL(dst))
334 dst_release(dst);
335 dst = bdst;
336 break;
337 }
338
339 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
340 if (matchlen > bmatchlen) {
341 dst_release(bdst);
342 continue;
343 }
344
345 if (!IS_ERR_OR_NULL(dst))
346 dst_release(dst);
347 dst = bdst;
348 matchlen = bmatchlen;
349 }
350 rcu_read_unlock();
351
352out:
353 if (!IS_ERR_OR_NULL(dst)) {
354 struct rt6_info *rt;
355
356 rt = (struct rt6_info *)dst;
357 t->dst = dst;
358 t->dst_cookie = rt6_get_cookie(rt);
359 pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
360 &rt->rt6i_dst.addr, rt->rt6i_dst.plen,
361 &fl6->saddr);
362 } else {
363 t->dst = NULL;
364
365 pr_debug("no route\n");
366 }
367}
368
369/* Returns the number of consecutive initial bits that match in the 2 ipv6
370 * addresses.
371 */
372static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
373 union sctp_addr *s2)
374{
375 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
376}
377
378/* Fills in the source address(saddr) based on the destination address(daddr)
379 * and asoc's bind address list.
380 */
381static void sctp_v6_get_saddr(struct sctp_sock *sk,
382 struct sctp_transport *t,
383 struct flowi *fl)
384{
385 struct flowi6 *fl6 = &fl->u.ip6;
386 union sctp_addr *saddr = &t->saddr;
387
388 pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
389
390 if (t->dst) {
391 saddr->v6.sin6_family = AF_INET6;
392 saddr->v6.sin6_addr = fl6->saddr;
393 }
394}
395
396/* Make a copy of all potential local addresses. */
397static void sctp_v6_copy_addrlist(struct list_head *addrlist,
398 struct net_device *dev)
399{
400 struct inet6_dev *in6_dev;
401 struct inet6_ifaddr *ifp;
402 struct sctp_sockaddr_entry *addr;
403
404 rcu_read_lock();
405 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
406 rcu_read_unlock();
407 return;
408 }
409
410 read_lock_bh(&in6_dev->lock);
411 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
412 /* Add the address to the local list. */
413 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
414 if (addr) {
415 addr->a.v6.sin6_family = AF_INET6;
416 addr->a.v6.sin6_addr = ifp->addr;
417 addr->a.v6.sin6_scope_id = dev->ifindex;
418 addr->valid = 1;
419 INIT_LIST_HEAD(&addr->list);
420 list_add_tail(&addr->list, addrlist);
421 }
422 }
423
424 read_unlock_bh(&in6_dev->lock);
425 rcu_read_unlock();
426}
427
428/* Initialize a sockaddr_storage from in incoming skb. */
429static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
430 int is_saddr)
431{
432 /* Always called on head skb, so this is safe */
433 struct sctphdr *sh = sctp_hdr(skb);
434 struct sockaddr_in6 *sa = &addr->v6;
435
436 addr->v6.sin6_family = AF_INET6;
437 addr->v6.sin6_flowinfo = 0; /* FIXME */
438 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
439
440 if (is_saddr) {
441 sa->sin6_port = sh->source;
442 sa->sin6_addr = ipv6_hdr(skb)->saddr;
443 } else {
444 sa->sin6_port = sh->dest;
445 sa->sin6_addr = ipv6_hdr(skb)->daddr;
446 }
447}
448
449/* Initialize an sctp_addr from a socket. */
450static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
451{
452 addr->v6.sin6_family = AF_INET6;
453 addr->v6.sin6_port = 0;
454 addr->v6.sin6_addr = sk->sk_v6_rcv_saddr;
455}
456
457/* Initialize sk->sk_rcv_saddr from sctp_addr. */
458static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
459{
460 if (addr->sa.sa_family == AF_INET) {
461 sk->sk_v6_rcv_saddr.s6_addr32[0] = 0;
462 sk->sk_v6_rcv_saddr.s6_addr32[1] = 0;
463 sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
464 sk->sk_v6_rcv_saddr.s6_addr32[3] =
465 addr->v4.sin_addr.s_addr;
466 } else {
467 sk->sk_v6_rcv_saddr = addr->v6.sin6_addr;
468 }
469}
470
471/* Initialize sk->sk_daddr from sctp_addr. */
472static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
473{
474 if (addr->sa.sa_family == AF_INET) {
475 sk->sk_v6_daddr.s6_addr32[0] = 0;
476 sk->sk_v6_daddr.s6_addr32[1] = 0;
477 sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff);
478 sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
479 } else {
480 sk->sk_v6_daddr = addr->v6.sin6_addr;
481 }
482}
483
484/* Initialize a sctp_addr from an address parameter. */
485static void sctp_v6_from_addr_param(union sctp_addr *addr,
486 union sctp_addr_param *param,
487 __be16 port, int iif)
488{
489 addr->v6.sin6_family = AF_INET6;
490 addr->v6.sin6_port = port;
491 addr->v6.sin6_flowinfo = 0; /* BUG */
492 addr->v6.sin6_addr = param->v6.addr;
493 addr->v6.sin6_scope_id = iif;
494}
495
496/* Initialize an address parameter from a sctp_addr and return the length
497 * of the address parameter.
498 */
499static int sctp_v6_to_addr_param(const union sctp_addr *addr,
500 union sctp_addr_param *param)
501{
502 int length = sizeof(struct sctp_ipv6addr_param);
503
504 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
505 param->v6.param_hdr.length = htons(length);
506 param->v6.addr = addr->v6.sin6_addr;
507
508 return length;
509}
510
511/* Initialize a sctp_addr from struct in6_addr. */
512static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
513 __be16 port)
514{
515 addr->sa.sa_family = AF_INET6;
516 addr->v6.sin6_port = port;
517 addr->v6.sin6_flowinfo = 0;
518 addr->v6.sin6_addr = *saddr;
519 addr->v6.sin6_scope_id = 0;
520}
521
522static int __sctp_v6_cmp_addr(const union sctp_addr *addr1,
523 const union sctp_addr *addr2)
524{
525 if (addr1->sa.sa_family != addr2->sa.sa_family) {
526 if (addr1->sa.sa_family == AF_INET &&
527 addr2->sa.sa_family == AF_INET6 &&
528 ipv6_addr_v4mapped(&addr2->v6.sin6_addr) &&
529 addr2->v6.sin6_addr.s6_addr32[3] ==
530 addr1->v4.sin_addr.s_addr)
531 return 1;
532
533 if (addr2->sa.sa_family == AF_INET &&
534 addr1->sa.sa_family == AF_INET6 &&
535 ipv6_addr_v4mapped(&addr1->v6.sin6_addr) &&
536 addr1->v6.sin6_addr.s6_addr32[3] ==
537 addr2->v4.sin_addr.s_addr)
538 return 1;
539
540 return 0;
541 }
542
543 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
544 return 0;
545
546 /* If this is a linklocal address, compare the scope_id. */
547 if ((ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) &&
548 addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
549 addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)
550 return 0;
551
552 return 1;
553}
554
555/* Compare addresses exactly.
556 * v4-mapped-v6 is also in consideration.
557 */
558static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
559 const union sctp_addr *addr2)
560{
561 return __sctp_v6_cmp_addr(addr1, addr2) &&
562 addr1->v6.sin6_port == addr2->v6.sin6_port;
563}
564
565/* Initialize addr struct to INADDR_ANY. */
566static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
567{
568 memset(addr, 0x00, sizeof(union sctp_addr));
569 addr->v6.sin6_family = AF_INET6;
570 addr->v6.sin6_port = port;
571}
572
573/* Is this a wildcard address? */
574static int sctp_v6_is_any(const union sctp_addr *addr)
575{
576 return ipv6_addr_any(&addr->v6.sin6_addr);
577}
578
579/* Should this be available for binding? */
580static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
581{
582 int type;
583 struct net *net = sock_net(&sp->inet.sk);
584 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
585
586 type = ipv6_addr_type(in6);
587 if (IPV6_ADDR_ANY == type)
588 return 1;
589 if (type == IPV6_ADDR_MAPPED) {
590 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
591 return 0;
592 sctp_v6_map_v4(addr);
593 return sctp_get_af_specific(AF_INET)->available(addr, sp);
594 }
595 if (!(type & IPV6_ADDR_UNICAST))
596 return 0;
597
598 return sp->inet.freebind || net->ipv6.sysctl.ip_nonlocal_bind ||
599 ipv6_chk_addr(net, in6, NULL, 0);
600}
601
602/* This function checks if the address is a valid address to be used for
603 * SCTP.
604 *
605 * Output:
606 * Return 0 - If the address is a non-unicast or an illegal address.
607 * Return 1 - If the address is a unicast.
608 */
609static int sctp_v6_addr_valid(union sctp_addr *addr,
610 struct sctp_sock *sp,
611 const struct sk_buff *skb)
612{
613 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
614
615 /* Support v4-mapped-v6 address. */
616 if (ret == IPV6_ADDR_MAPPED) {
617 /* Note: This routine is used in input, so v4-mapped-v6
618 * are disallowed here when there is no sctp_sock.
619 */
620 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
621 return 0;
622 sctp_v6_map_v4(addr);
623 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
624 }
625
626 /* Is this a non-unicast address */
627 if (!(ret & IPV6_ADDR_UNICAST))
628 return 0;
629
630 return 1;
631}
632
633/* What is the scope of 'addr'? */
634static enum sctp_scope sctp_v6_scope(union sctp_addr *addr)
635{
636 enum sctp_scope retval;
637 int v6scope;
638
639 /* The IPv6 scope is really a set of bit fields.
640 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
641 */
642
643 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
644 switch (v6scope) {
645 case IFA_HOST:
646 retval = SCTP_SCOPE_LOOPBACK;
647 break;
648 case IFA_LINK:
649 retval = SCTP_SCOPE_LINK;
650 break;
651 case IFA_SITE:
652 retval = SCTP_SCOPE_PRIVATE;
653 break;
654 default:
655 retval = SCTP_SCOPE_GLOBAL;
656 break;
657 }
658
659 return retval;
660}
661
662/* Create and initialize a new sk for the socket to be returned by accept(). */
663static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
664 struct sctp_association *asoc,
665 bool kern)
666{
667 struct sock *newsk;
668 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
669 struct sctp6_sock *newsctp6sk;
670 struct ipv6_txoptions *opt;
671
672 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, kern);
673 if (!newsk)
674 goto out;
675
676 sock_init_data(NULL, newsk);
677
678 sctp_copy_sock(newsk, sk, asoc);
679 sock_reset_flag(sk, SOCK_ZAPPED);
680
681 newsctp6sk = (struct sctp6_sock *)newsk;
682 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
683
684 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
685
686 newnp = inet6_sk(newsk);
687
688 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
689 newnp->ipv6_mc_list = NULL;
690 newnp->ipv6_ac_list = NULL;
691 newnp->ipv6_fl_list = NULL;
692
693 rcu_read_lock();
694 opt = rcu_dereference(np->opt);
695 if (opt)
696 opt = ipv6_dup_options(newsk, opt);
697 RCU_INIT_POINTER(newnp->opt, opt);
698 rcu_read_unlock();
699
700 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
701 * and getpeername().
702 */
703 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
704
705 newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
706
707 sk_refcnt_debug_inc(newsk);
708
709 if (newsk->sk_prot->init(newsk)) {
710 sk_common_release(newsk);
711 newsk = NULL;
712 }
713
714out:
715 return newsk;
716}
717
718/* Format a sockaddr for return to user space. This makes sure the return is
719 * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
720 */
721static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
722{
723 if (sp->v4mapped) {
724 if (addr->sa.sa_family == AF_INET)
725 sctp_v4_map_v6(addr);
726 } else {
727 if (addr->sa.sa_family == AF_INET6 &&
728 ipv6_addr_v4mapped(&addr->v6.sin6_addr))
729 sctp_v6_map_v4(addr);
730 }
731
732 if (addr->sa.sa_family == AF_INET) {
733 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
734 return sizeof(struct sockaddr_in);
735 }
736 return sizeof(struct sockaddr_in6);
737}
738
739/* Where did this skb come from? */
740static int sctp_v6_skb_iif(const struct sk_buff *skb)
741{
742 return IP6CB(skb)->iif;
743}
744
745/* Was this packet marked by Explicit Congestion Notification? */
746static int sctp_v6_is_ce(const struct sk_buff *skb)
747{
748 return *((__u32 *)(ipv6_hdr(skb))) & (__force __u32)htonl(1 << 20);
749}
750
751/* Dump the v6 addr to the seq file. */
752static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
753{
754 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
755}
756
757static void sctp_v6_ecn_capable(struct sock *sk)
758{
759 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
760}
761
762/* Initialize a PF_INET msgname from a ulpevent. */
763static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
764 char *msgname, int *addrlen)
765{
766 union sctp_addr *addr;
767 struct sctp_association *asoc;
768 union sctp_addr *paddr;
769
770 if (!msgname)
771 return;
772
773 addr = (union sctp_addr *)msgname;
774 asoc = event->asoc;
775 paddr = &asoc->peer.primary_addr;
776
777 if (paddr->sa.sa_family == AF_INET) {
778 addr->v4.sin_family = AF_INET;
779 addr->v4.sin_port = htons(asoc->peer.port);
780 addr->v4.sin_addr = paddr->v4.sin_addr;
781 } else {
782 addr->v6.sin6_family = AF_INET6;
783 addr->v6.sin6_flowinfo = 0;
784 if (ipv6_addr_type(&paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
785 addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id;
786 else
787 addr->v6.sin6_scope_id = 0;
788 addr->v6.sin6_port = htons(asoc->peer.port);
789 addr->v6.sin6_addr = paddr->v6.sin6_addr;
790 }
791
792 *addrlen = sctp_v6_addr_to_user(sctp_sk(asoc->base.sk), addr);
793}
794
795/* Initialize a msg_name from an inbound skb. */
796static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
797 int *addr_len)
798{
799 union sctp_addr *addr;
800 struct sctphdr *sh;
801
802 if (!msgname)
803 return;
804
805 addr = (union sctp_addr *)msgname;
806 sh = sctp_hdr(skb);
807
808 if (ip_hdr(skb)->version == 4) {
809 addr->v4.sin_family = AF_INET;
810 addr->v4.sin_port = sh->source;
811 addr->v4.sin_addr.s_addr = ip_hdr(skb)->saddr;
812 } else {
813 addr->v6.sin6_family = AF_INET6;
814 addr->v6.sin6_flowinfo = 0;
815 addr->v6.sin6_port = sh->source;
816 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
817 if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
818 addr->v6.sin6_scope_id = sctp_v6_skb_iif(skb);
819 else
820 addr->v6.sin6_scope_id = 0;
821 }
822
823 *addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr);
824}
825
826/* Do we support this AF? */
827static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
828{
829 switch (family) {
830 case AF_INET6:
831 return 1;
832 /* v4-mapped-v6 addresses */
833 case AF_INET:
834 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
835 return 1;
836 default:
837 return 0;
838 }
839}
840
841/* Address matching with wildcards allowed. This extra level
842 * of indirection lets us choose whether a PF_INET6 should
843 * disallow any v4 addresses if we so choose.
844 */
845static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
846 const union sctp_addr *addr2,
847 struct sctp_sock *opt)
848{
849 struct sock *sk = sctp_opt2sk(opt);
850 struct sctp_af *af1, *af2;
851
852 af1 = sctp_get_af_specific(addr1->sa.sa_family);
853 af2 = sctp_get_af_specific(addr2->sa.sa_family);
854
855 if (!af1 || !af2)
856 return 0;
857
858 /* If the socket is IPv6 only, v4 addrs will not match */
859 if (__ipv6_only_sock(sk) && af1 != af2)
860 return 0;
861
862 /* Today, wildcard AF_INET/AF_INET6. */
863 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
864 return 1;
865
866 if (addr1->sa.sa_family == AF_INET && addr2->sa.sa_family == AF_INET)
867 return addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr;
868
869 return __sctp_v6_cmp_addr(addr1, addr2);
870}
871
872/* Verify that the provided sockaddr looks bindable. Common verification,
873 * has already been taken care of.
874 */
875static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
876{
877 struct sctp_af *af;
878
879 /* ASSERT: address family has already been verified. */
880 if (addr->sa.sa_family != AF_INET6)
881 af = sctp_get_af_specific(addr->sa.sa_family);
882 else {
883 int type = ipv6_addr_type(&addr->v6.sin6_addr);
884 struct net_device *dev;
885
886 if (type & IPV6_ADDR_LINKLOCAL) {
887 struct net *net;
888 if (!addr->v6.sin6_scope_id)
889 return 0;
890 net = sock_net(&opt->inet.sk);
891 rcu_read_lock();
892 dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
893 if (!dev || !(opt->inet.freebind ||
894 net->ipv6.sysctl.ip_nonlocal_bind ||
895 ipv6_chk_addr(net, &addr->v6.sin6_addr,
896 dev, 0))) {
897 rcu_read_unlock();
898 return 0;
899 }
900 rcu_read_unlock();
901 }
902
903 af = opt->pf->af;
904 }
905 return af->available(addr, opt);
906}
907
908/* Verify that the provided sockaddr looks sendable. Common verification,
909 * has already been taken care of.
910 */
911static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
912{
913 struct sctp_af *af = NULL;
914
915 /* ASSERT: address family has already been verified. */
916 if (addr->sa.sa_family != AF_INET6)
917 af = sctp_get_af_specific(addr->sa.sa_family);
918 else {
919 int type = ipv6_addr_type(&addr->v6.sin6_addr);
920 struct net_device *dev;
921
922 if (type & IPV6_ADDR_LINKLOCAL) {
923 if (!addr->v6.sin6_scope_id)
924 return 0;
925 rcu_read_lock();
926 dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
927 addr->v6.sin6_scope_id);
928 rcu_read_unlock();
929 if (!dev)
930 return 0;
931 }
932 af = opt->pf->af;
933 }
934
935 return af != NULL;
936}
937
938/* Fill in Supported Address Type information for INIT and INIT-ACK
939 * chunks. Note: In the future, we may want to look at sock options
940 * to determine whether a PF_INET6 socket really wants to have IPV4
941 * addresses.
942 * Returns number of addresses supported.
943 */
944static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
945 __be16 *types)
946{
947 types[0] = SCTP_PARAM_IPV6_ADDRESS;
948 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
949 types[1] = SCTP_PARAM_IPV4_ADDRESS;
950 return 2;
951 }
952 return 1;
953}
954
955/* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
956static int sctp_getname(struct socket *sock, struct sockaddr *uaddr,
957 int *uaddr_len, int peer)
958{
959 int rc;
960
961 rc = inet6_getname(sock, uaddr, uaddr_len, peer);
962
963 if (rc != 0)
964 return rc;
965
966 *uaddr_len = sctp_v6_addr_to_user(sctp_sk(sock->sk),
967 (union sctp_addr *)uaddr);
968
969 return rc;
970}
971
972static const struct proto_ops inet6_seqpacket_ops = {
973 .family = PF_INET6,
974 .owner = THIS_MODULE,
975 .release = inet6_release,
976 .bind = inet6_bind,
977 .connect = inet_dgram_connect,
978 .socketpair = sock_no_socketpair,
979 .accept = inet_accept,
980 .getname = sctp_getname,
981 .poll = sctp_poll,
982 .ioctl = inet6_ioctl,
983 .listen = sctp_inet_listen,
984 .shutdown = inet_shutdown,
985 .setsockopt = sock_common_setsockopt,
986 .getsockopt = sock_common_getsockopt,
987 .sendmsg = inet_sendmsg,
988 .recvmsg = inet_recvmsg,
989 .mmap = sock_no_mmap,
990#ifdef CONFIG_COMPAT
991 .compat_setsockopt = compat_sock_common_setsockopt,
992 .compat_getsockopt = compat_sock_common_getsockopt,
993#endif
994};
995
996static struct inet_protosw sctpv6_seqpacket_protosw = {
997 .type = SOCK_SEQPACKET,
998 .protocol = IPPROTO_SCTP,
999 .prot = &sctpv6_prot,
1000 .ops = &inet6_seqpacket_ops,
1001 .flags = SCTP_PROTOSW_FLAG
1002};
1003static struct inet_protosw sctpv6_stream_protosw = {
1004 .type = SOCK_STREAM,
1005 .protocol = IPPROTO_SCTP,
1006 .prot = &sctpv6_prot,
1007 .ops = &inet6_seqpacket_ops,
1008 .flags = SCTP_PROTOSW_FLAG,
1009};
1010
1011static int sctp6_rcv(struct sk_buff *skb)
1012{
1013 return sctp_rcv(skb) ? -1 : 0;
1014}
1015
1016static const struct inet6_protocol sctpv6_protocol = {
1017 .handler = sctp6_rcv,
1018 .err_handler = sctp_v6_err,
1019 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1020};
1021
1022static struct sctp_af sctp_af_inet6 = {
1023 .sa_family = AF_INET6,
1024 .sctp_xmit = sctp_v6_xmit,
1025 .setsockopt = ipv6_setsockopt,
1026 .getsockopt = ipv6_getsockopt,
1027 .get_dst = sctp_v6_get_dst,
1028 .get_saddr = sctp_v6_get_saddr,
1029 .copy_addrlist = sctp_v6_copy_addrlist,
1030 .from_skb = sctp_v6_from_skb,
1031 .from_sk = sctp_v6_from_sk,
1032 .from_addr_param = sctp_v6_from_addr_param,
1033 .to_addr_param = sctp_v6_to_addr_param,
1034 .cmp_addr = sctp_v6_cmp_addr,
1035 .scope = sctp_v6_scope,
1036 .addr_valid = sctp_v6_addr_valid,
1037 .inaddr_any = sctp_v6_inaddr_any,
1038 .is_any = sctp_v6_is_any,
1039 .available = sctp_v6_available,
1040 .skb_iif = sctp_v6_skb_iif,
1041 .is_ce = sctp_v6_is_ce,
1042 .seq_dump_addr = sctp_v6_seq_dump_addr,
1043 .ecn_capable = sctp_v6_ecn_capable,
1044 .net_header_len = sizeof(struct ipv6hdr),
1045 .sockaddr_len = sizeof(struct sockaddr_in6),
1046#ifdef CONFIG_COMPAT
1047 .compat_setsockopt = compat_ipv6_setsockopt,
1048 .compat_getsockopt = compat_ipv6_getsockopt,
1049#endif
1050};
1051
1052static struct sctp_pf sctp_pf_inet6 = {
1053 .event_msgname = sctp_inet6_event_msgname,
1054 .skb_msgname = sctp_inet6_skb_msgname,
1055 .af_supported = sctp_inet6_af_supported,
1056 .cmp_addr = sctp_inet6_cmp_addr,
1057 .bind_verify = sctp_inet6_bind_verify,
1058 .send_verify = sctp_inet6_send_verify,
1059 .supported_addrs = sctp_inet6_supported_addrs,
1060 .create_accept_sk = sctp_v6_create_accept_sk,
1061 .addr_to_user = sctp_v6_addr_to_user,
1062 .to_sk_saddr = sctp_v6_to_sk_saddr,
1063 .to_sk_daddr = sctp_v6_to_sk_daddr,
1064 .af = &sctp_af_inet6,
1065};
1066
1067/* Initialize IPv6 support and register with socket layer. */
1068void sctp_v6_pf_init(void)
1069{
1070 /* Register the SCTP specific PF_INET6 functions. */
1071 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1072
1073 /* Register the SCTP specific AF_INET6 functions. */
1074 sctp_register_af(&sctp_af_inet6);
1075}
1076
1077void sctp_v6_pf_exit(void)
1078{
1079 list_del(&sctp_af_inet6.list);
1080}
1081
1082/* Initialize IPv6 support and register with socket layer. */
1083int sctp_v6_protosw_init(void)
1084{
1085 int rc;
1086
1087 rc = proto_register(&sctpv6_prot, 1);
1088 if (rc)
1089 return rc;
1090
1091 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1092 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1093 inet6_register_protosw(&sctpv6_stream_protosw);
1094
1095 return 0;
1096}
1097
1098void sctp_v6_protosw_exit(void)
1099{
1100 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1101 inet6_unregister_protosw(&sctpv6_stream_protosw);
1102 proto_unregister(&sctpv6_prot);
1103}
1104
1105
1106/* Register with inet6 layer. */
1107int sctp_v6_add_protocol(void)
1108{
1109 /* Register notifier for inet6 address additions/deletions. */
1110 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1111
1112 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1113 return -EAGAIN;
1114
1115 return 0;
1116}
1117
1118/* Unregister with inet6 layer. */
1119void sctp_v6_del_protocol(void)
1120{
1121 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1122 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1123}