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Linux/net/sctp/ipv6.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /* SCTP kernel implementation
  3  * (C) Copyright IBM Corp. 2002, 2004
  4  * Copyright (c) 2001 Nokia, Inc.
  5  * Copyright (c) 2001 La Monte H.P. Yarroll
  6  * Copyright (c) 2002-2003 Intel Corp.
  7  *
  8  * This file is part of the SCTP kernel implementation
  9  *
 10  * SCTP over IPv6.
 11  *
 12  * Please send any bug reports or fixes you make to the
 13  * email address(es):
 14  *    lksctp developers <linux-sctp@vger.kernel.org>
 15  *
 16  * Written or modified by:
 17  *    Le Yanqun             <yanqun.le@nokia.com>
 18  *    Hui Huang             <hui.huang@nokia.com>
 19  *    La Monte H.P. Yarroll <piggy@acm.org>
 20  *    Sridhar Samudrala     <sri@us.ibm.com>
 21  *    Jon Grimm             <jgrimm@us.ibm.com>
 22  *    Ardelle Fan           <ardelle.fan@intel.com>
 23  *
 24  * Based on:
 25  *      linux/net/ipv6/tcp_ipv6.c
 26  */
 27 
 28 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 29 
 30 #include <linux/module.h>
 31 #include <linux/errno.h>
 32 #include <linux/types.h>
 33 #include <linux/socket.h>
 34 #include <linux/sockios.h>
 35 #include <linux/net.h>
 36 #include <linux/in.h>
 37 #include <linux/in6.h>
 38 #include <linux/netdevice.h>
 39 #include <linux/init.h>
 40 #include <linux/ipsec.h>
 41 #include <linux/slab.h>
 42 
 43 #include <linux/ipv6.h>
 44 #include <linux/icmpv6.h>
 45 #include <linux/random.h>
 46 #include <linux/seq_file.h>
 47 
 48 #include <net/protocol.h>
 49 #include <net/ndisc.h>
 50 #include <net/ip.h>
 51 #include <net/ipv6.h>
 52 #include <net/transp_v6.h>
 53 #include <net/addrconf.h>
 54 #include <net/ip6_route.h>
 55 #include <net/inet_common.h>
 56 #include <net/inet_ecn.h>
 57 #include <net/sctp/sctp.h>
 58 #include <net/udp_tunnel.h>
 59 
 60 #include <linux/uaccess.h>
 61 
 62 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
 63                                          union sctp_addr *s2);
 64 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
 65                               __be16 port);
 66 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
 67                             const union sctp_addr *addr2);
 68 
 69 /* Event handler for inet6 address addition/deletion events.
 70  * The sctp_local_addr_list needs to be protocted by a spin lock since
 71  * multiple notifiers (say IPv4 and IPv6) may be running at the same
 72  * time and thus corrupt the list.
 73  * The reader side is protected with RCU.
 74  */
 75 static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
 76                                 void *ptr)
 77 {
 78         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
 79         struct sctp_sockaddr_entry *addr = NULL;
 80         struct sctp_sockaddr_entry *temp;
 81         struct net *net = dev_net(ifa->idev->dev);
 82         int found = 0;
 83 
 84         switch (ev) {
 85         case NETDEV_UP:
 86                 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
 87                 if (addr) {
 88                         addr->a.v6.sin6_family = AF_INET6;
 89                         addr->a.v6.sin6_addr = ifa->addr;
 90                         addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
 91                         addr->valid = 1;
 92                         spin_lock_bh(&net->sctp.local_addr_lock);
 93                         list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
 94                         sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
 95                         spin_unlock_bh(&net->sctp.local_addr_lock);
 96                 }
 97                 break;
 98         case NETDEV_DOWN:
 99                 spin_lock_bh(&net->sctp.local_addr_lock);
100                 list_for_each_entry_safe(addr, temp,
101                                         &net->sctp.local_addr_list, list) {
102                         if (addr->a.sa.sa_family == AF_INET6 &&
103                                         ipv6_addr_equal(&addr->a.v6.sin6_addr,
104                                                 &ifa->addr)) {
105                                 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
106                                 found = 1;
107                                 addr->valid = 0;
108                                 list_del_rcu(&addr->list);
109                                 break;
110                         }
111                 }
112                 spin_unlock_bh(&net->sctp.local_addr_lock);
113                 if (found)
114                         kfree_rcu(addr, rcu);
115                 break;
116         }
117 
118         return NOTIFY_DONE;
119 }
120 
121 static struct notifier_block sctp_inet6addr_notifier = {
122         .notifier_call = sctp_inet6addr_event,
123 };
124 
125 /* ICMP error handler. */
126 static int sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
127                         u8 type, u8 code, int offset, __be32 info)
128 {
129         struct inet6_dev *idev;
130         struct sock *sk;
131         struct sctp_association *asoc;
132         struct sctp_transport *transport;
133         struct ipv6_pinfo *np;
134         __u16 saveip, savesctp;
135         int err, ret = 0;
136         struct net *net = dev_net(skb->dev);
137 
138         idev = in6_dev_get(skb->dev);
139 
140         /* Fix up skb to look at the embedded net header. */
141         saveip   = skb->network_header;
142         savesctp = skb->transport_header;
143         skb_reset_network_header(skb);
144         skb_set_transport_header(skb, offset);
145         sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
146         /* Put back, the original pointers. */
147         skb->network_header   = saveip;
148         skb->transport_header = savesctp;
149         if (!sk) {
150                 __ICMP6_INC_STATS(net, idev, ICMP6_MIB_INERRORS);
151                 ret = -ENOENT;
152                 goto out;
153         }
154 
155         /* Warning:  The sock lock is held.  Remember to call
156          * sctp_err_finish!
157          */
158 
159         switch (type) {
160         case ICMPV6_PKT_TOOBIG:
161                 if (ip6_sk_accept_pmtu(sk))
162                         sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
163                 goto out_unlock;
164         case ICMPV6_PARAMPROB:
165                 if (ICMPV6_UNK_NEXTHDR == code) {
166                         sctp_icmp_proto_unreachable(sk, asoc, transport);
167                         goto out_unlock;
168                 }
169                 break;
170         case NDISC_REDIRECT:
171                 sctp_icmp_redirect(sk, transport, skb);
172                 goto out_unlock;
173         default:
174                 break;
175         }
176 
177         np = inet6_sk(sk);
178         icmpv6_err_convert(type, code, &err);
179         if (!sock_owned_by_user(sk) && np->recverr) {
180                 sk->sk_err = err;
181                 sk->sk_error_report(sk);
182         } else {  /* Only an error on timeout */
183                 sk->sk_err_soft = err;
184         }
185 
186 out_unlock:
187         sctp_err_finish(sk, transport);
188 out:
189         if (likely(idev != NULL))
190                 in6_dev_put(idev);
191 
192         return ret;
193 }
194 
195 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *t)
196 {
197         struct dst_entry *dst = dst_clone(t->dst);
198         struct flowi6 *fl6 = &t->fl.u.ip6;
199         struct sock *sk = skb->sk;
200         struct ipv6_pinfo *np = inet6_sk(sk);
201         __u8 tclass = np->tclass;
202         __be32 label;
203 
204         pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
205                  skb->len, &fl6->saddr, &fl6->daddr);
206 
207         if (t->dscp & SCTP_DSCP_SET_MASK)
208                 tclass = t->dscp & SCTP_DSCP_VAL_MASK;
209 
210         if (INET_ECN_is_capable(tclass))
211                 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
212 
213         if (!(t->param_flags & SPP_PMTUD_ENABLE))
214                 skb->ignore_df = 1;
215 
216         SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
217 
218         if (!t->encap_port || !sctp_sk(sk)->udp_port) {
219                 int res;
220 
221                 skb_dst_set(skb, dst);
222                 rcu_read_lock();
223                 res = ip6_xmit(sk, skb, fl6, sk->sk_mark,
224                                rcu_dereference(np->opt),
225                                tclass, sk->sk_priority);
226                 rcu_read_unlock();
227                 return res;
228         }
229 
230         if (skb_is_gso(skb))
231                 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM;
232 
233         skb->encapsulation = 1;
234         skb_reset_inner_mac_header(skb);
235         skb_reset_inner_transport_header(skb);
236         skb_set_inner_ipproto(skb, IPPROTO_SCTP);
237         label = ip6_make_flowlabel(sock_net(sk), skb, fl6->flowlabel, true, fl6);
238 
239         return udp_tunnel6_xmit_skb(dst, sk, skb, NULL, &fl6->saddr,
240                                     &fl6->daddr, tclass, ip6_dst_hoplimit(dst),
241                                     label, sctp_sk(sk)->udp_port, t->encap_port, false);
242 }
243 
244 /* Returns the dst cache entry for the given source and destination ip
245  * addresses.
246  */
247 static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
248                             struct flowi *fl, struct sock *sk)
249 {
250         struct sctp_association *asoc = t->asoc;
251         struct dst_entry *dst = NULL;
252         struct flowi _fl;
253         struct flowi6 *fl6 = &_fl.u.ip6;
254         struct sctp_bind_addr *bp;
255         struct ipv6_pinfo *np = inet6_sk(sk);
256         struct sctp_sockaddr_entry *laddr;
257         union sctp_addr *daddr = &t->ipaddr;
258         union sctp_addr dst_saddr;
259         struct in6_addr *final_p, final;
260         enum sctp_scope scope;
261         __u8 matchlen = 0;
262 
263         memset(&_fl, 0, sizeof(_fl));
264         fl6->daddr = daddr->v6.sin6_addr;
265         fl6->fl6_dport = daddr->v6.sin6_port;
266         fl6->flowi6_proto = IPPROTO_SCTP;
267         if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
268                 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
269         else if (asoc)
270                 fl6->flowi6_oif = asoc->base.sk->sk_bound_dev_if;
271         if (t->flowlabel & SCTP_FLOWLABEL_SET_MASK)
272                 fl6->flowlabel = htonl(t->flowlabel & SCTP_FLOWLABEL_VAL_MASK);
273 
274         if (np->sndflow && (fl6->flowlabel & IPV6_FLOWLABEL_MASK)) {
275                 struct ip6_flowlabel *flowlabel;
276 
277                 flowlabel = fl6_sock_lookup(sk, fl6->flowlabel);
278                 if (IS_ERR(flowlabel))
279                         goto out;
280                 fl6_sock_release(flowlabel);
281         }
282 
283         pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
284 
285         if (asoc)
286                 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
287 
288         if (saddr) {
289                 fl6->saddr = saddr->v6.sin6_addr;
290                 if (!fl6->fl6_sport)
291                         fl6->fl6_sport = saddr->v6.sin6_port;
292 
293                 pr_debug("src=%pI6 - ", &fl6->saddr);
294         }
295 
296         rcu_read_lock();
297         final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
298         rcu_read_unlock();
299 
300         dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p);
301         if (!asoc || saddr) {
302                 t->dst = dst;
303                 memcpy(fl, &_fl, sizeof(_fl));
304                 goto out;
305         }
306 
307         bp = &asoc->base.bind_addr;
308         scope = sctp_scope(daddr);
309         /* ip6_dst_lookup has filled in the fl6->saddr for us.  Check
310          * to see if we can use it.
311          */
312         if (!IS_ERR(dst)) {
313                 /* Walk through the bind address list and look for a bind
314                  * address that matches the source address of the returned dst.
315                  */
316                 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
317                 rcu_read_lock();
318                 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
319                         if (!laddr->valid || laddr->state == SCTP_ADDR_DEL ||
320                             (laddr->state != SCTP_ADDR_SRC &&
321                              !asoc->src_out_of_asoc_ok))
322                                 continue;
323 
324                         /* Do not compare against v4 addrs */
325                         if ((laddr->a.sa.sa_family == AF_INET6) &&
326                             (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
327                                 rcu_read_unlock();
328                                 t->dst = dst;
329                                 memcpy(fl, &_fl, sizeof(_fl));
330                                 goto out;
331                         }
332                 }
333                 rcu_read_unlock();
334                 /* None of the bound addresses match the source address of the
335                  * dst. So release it.
336                  */
337                 dst_release(dst);
338                 dst = NULL;
339         }
340 
341         /* Walk through the bind address list and try to get the
342          * best source address for a given destination.
343          */
344         rcu_read_lock();
345         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
346                 struct dst_entry *bdst;
347                 __u8 bmatchlen;
348 
349                 if (!laddr->valid ||
350                     laddr->state != SCTP_ADDR_SRC ||
351                     laddr->a.sa.sa_family != AF_INET6 ||
352                     scope > sctp_scope(&laddr->a))
353                         continue;
354 
355                 fl6->saddr = laddr->a.v6.sin6_addr;
356                 fl6->fl6_sport = laddr->a.v6.sin6_port;
357                 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
358                 bdst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p);
359 
360                 if (IS_ERR(bdst))
361                         continue;
362 
363                 if (ipv6_chk_addr(dev_net(bdst->dev),
364                                   &laddr->a.v6.sin6_addr, bdst->dev, 1)) {
365                         if (!IS_ERR_OR_NULL(dst))
366                                 dst_release(dst);
367                         dst = bdst;
368                         t->dst = dst;
369                         memcpy(fl, &_fl, sizeof(_fl));
370                         break;
371                 }
372 
373                 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
374                 if (matchlen > bmatchlen) {
375                         dst_release(bdst);
376                         continue;
377                 }
378 
379                 if (!IS_ERR_OR_NULL(dst))
380                         dst_release(dst);
381                 dst = bdst;
382                 matchlen = bmatchlen;
383                 t->dst = dst;
384                 memcpy(fl, &_fl, sizeof(_fl));
385         }
386         rcu_read_unlock();
387 
388 out:
389         if (!IS_ERR_OR_NULL(dst)) {
390                 struct rt6_info *rt;
391 
392                 rt = (struct rt6_info *)dst;
393                 t->dst_cookie = rt6_get_cookie(rt);
394                 pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
395                          &rt->rt6i_dst.addr, rt->rt6i_dst.plen,
396                          &fl->u.ip6.saddr);
397         } else {
398                 t->dst = NULL;
399                 pr_debug("no route\n");
400         }
401 }
402 
403 /* Returns the number of consecutive initial bits that match in the 2 ipv6
404  * addresses.
405  */
406 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
407                                          union sctp_addr *s2)
408 {
409         return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
410 }
411 
412 /* Fills in the source address(saddr) based on the destination address(daddr)
413  * and asoc's bind address list.
414  */
415 static void sctp_v6_get_saddr(struct sctp_sock *sk,
416                               struct sctp_transport *t,
417                               struct flowi *fl)
418 {
419         struct flowi6 *fl6 = &fl->u.ip6;
420         union sctp_addr *saddr = &t->saddr;
421 
422         pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
423 
424         if (t->dst) {
425                 saddr->v6.sin6_family = AF_INET6;
426                 saddr->v6.sin6_addr = fl6->saddr;
427         }
428 }
429 
430 /* Make a copy of all potential local addresses. */
431 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
432                                   struct net_device *dev)
433 {
434         struct inet6_dev *in6_dev;
435         struct inet6_ifaddr *ifp;
436         struct sctp_sockaddr_entry *addr;
437 
438         rcu_read_lock();
439         if ((in6_dev = __in6_dev_get(dev)) == NULL) {
440                 rcu_read_unlock();
441                 return;
442         }
443 
444         read_lock_bh(&in6_dev->lock);
445         list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
446                 /* Add the address to the local list.  */
447                 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
448                 if (addr) {
449                         addr->a.v6.sin6_family = AF_INET6;
450                         addr->a.v6.sin6_addr = ifp->addr;
451                         addr->a.v6.sin6_scope_id = dev->ifindex;
452                         addr->valid = 1;
453                         INIT_LIST_HEAD(&addr->list);
454                         list_add_tail(&addr->list, addrlist);
455                 }
456         }
457 
458         read_unlock_bh(&in6_dev->lock);
459         rcu_read_unlock();
460 }
461 
462 /* Copy over any ip options */
463 static void sctp_v6_copy_ip_options(struct sock *sk, struct sock *newsk)
464 {
465         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
466         struct ipv6_txoptions *opt;
467 
468         newnp = inet6_sk(newsk);
469 
470         rcu_read_lock();
471         opt = rcu_dereference(np->opt);
472         if (opt) {
473                 opt = ipv6_dup_options(newsk, opt);
474                 if (!opt)
475                         pr_err("%s: Failed to copy ip options\n", __func__);
476         }
477         RCU_INIT_POINTER(newnp->opt, opt);
478         rcu_read_unlock();
479 }
480 
481 /* Account for the IP options */
482 static int sctp_v6_ip_options_len(struct sock *sk)
483 {
484         struct ipv6_pinfo *np = inet6_sk(sk);
485         struct ipv6_txoptions *opt;
486         int len = 0;
487 
488         rcu_read_lock();
489         opt = rcu_dereference(np->opt);
490         if (opt)
491                 len = opt->opt_flen + opt->opt_nflen;
492 
493         rcu_read_unlock();
494         return len;
495 }
496 
497 /* Initialize a sockaddr_storage from in incoming skb. */
498 static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
499                              int is_saddr)
500 {
501         /* Always called on head skb, so this is safe */
502         struct sctphdr *sh = sctp_hdr(skb);
503         struct sockaddr_in6 *sa = &addr->v6;
504 
505         addr->v6.sin6_family = AF_INET6;
506         addr->v6.sin6_flowinfo = 0; /* FIXME */
507         addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
508 
509         if (is_saddr) {
510                 sa->sin6_port = sh->source;
511                 sa->sin6_addr = ipv6_hdr(skb)->saddr;
512         } else {
513                 sa->sin6_port = sh->dest;
514                 sa->sin6_addr = ipv6_hdr(skb)->daddr;
515         }
516 }
517 
518 /* Initialize an sctp_addr from a socket. */
519 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
520 {
521         addr->v6.sin6_family = AF_INET6;
522         addr->v6.sin6_port = 0;
523         addr->v6.sin6_addr = sk->sk_v6_rcv_saddr;
524 }
525 
526 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
527 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
528 {
529         if (addr->sa.sa_family == AF_INET) {
530                 sk->sk_v6_rcv_saddr.s6_addr32[0] = 0;
531                 sk->sk_v6_rcv_saddr.s6_addr32[1] = 0;
532                 sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
533                 sk->sk_v6_rcv_saddr.s6_addr32[3] =
534                         addr->v4.sin_addr.s_addr;
535         } else {
536                 sk->sk_v6_rcv_saddr = addr->v6.sin6_addr;
537         }
538 }
539 
540 /* Initialize sk->sk_daddr from sctp_addr. */
541 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
542 {
543         if (addr->sa.sa_family == AF_INET) {
544                 sk->sk_v6_daddr.s6_addr32[0] = 0;
545                 sk->sk_v6_daddr.s6_addr32[1] = 0;
546                 sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff);
547                 sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
548         } else {
549                 sk->sk_v6_daddr = addr->v6.sin6_addr;
550         }
551 }
552 
553 /* Initialize a sctp_addr from an address parameter. */
554 static void sctp_v6_from_addr_param(union sctp_addr *addr,
555                                     union sctp_addr_param *param,
556                                     __be16 port, int iif)
557 {
558         addr->v6.sin6_family = AF_INET6;
559         addr->v6.sin6_port = port;
560         addr->v6.sin6_flowinfo = 0; /* BUG */
561         addr->v6.sin6_addr = param->v6.addr;
562         addr->v6.sin6_scope_id = iif;
563 }
564 
565 /* Initialize an address parameter from a sctp_addr and return the length
566  * of the address parameter.
567  */
568 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
569                                  union sctp_addr_param *param)
570 {
571         int length = sizeof(struct sctp_ipv6addr_param);
572 
573         param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
574         param->v6.param_hdr.length = htons(length);
575         param->v6.addr = addr->v6.sin6_addr;
576 
577         return length;
578 }
579 
580 /* Initialize a sctp_addr from struct in6_addr. */
581 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
582                               __be16 port)
583 {
584         addr->sa.sa_family = AF_INET6;
585         addr->v6.sin6_port = port;
586         addr->v6.sin6_flowinfo = 0;
587         addr->v6.sin6_addr = *saddr;
588         addr->v6.sin6_scope_id = 0;
589 }
590 
591 static int __sctp_v6_cmp_addr(const union sctp_addr *addr1,
592                               const union sctp_addr *addr2)
593 {
594         if (addr1->sa.sa_family != addr2->sa.sa_family) {
595                 if (addr1->sa.sa_family == AF_INET &&
596                     addr2->sa.sa_family == AF_INET6 &&
597                     ipv6_addr_v4mapped(&addr2->v6.sin6_addr) &&
598                     addr2->v6.sin6_addr.s6_addr32[3] ==
599                     addr1->v4.sin_addr.s_addr)
600                         return 1;
601 
602                 if (addr2->sa.sa_family == AF_INET &&
603                     addr1->sa.sa_family == AF_INET6 &&
604                     ipv6_addr_v4mapped(&addr1->v6.sin6_addr) &&
605                     addr1->v6.sin6_addr.s6_addr32[3] ==
606                     addr2->v4.sin_addr.s_addr)
607                         return 1;
608 
609                 return 0;
610         }
611 
612         if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
613                 return 0;
614 
615         /* If this is a linklocal address, compare the scope_id. */
616         if ((ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) &&
617             addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
618             addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)
619                 return 0;
620 
621         return 1;
622 }
623 
624 /* Compare addresses exactly.
625  * v4-mapped-v6 is also in consideration.
626  */
627 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
628                             const union sctp_addr *addr2)
629 {
630         return __sctp_v6_cmp_addr(addr1, addr2) &&
631                addr1->v6.sin6_port == addr2->v6.sin6_port;
632 }
633 
634 /* Initialize addr struct to INADDR_ANY. */
635 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
636 {
637         memset(addr, 0x00, sizeof(union sctp_addr));
638         addr->v6.sin6_family = AF_INET6;
639         addr->v6.sin6_port = port;
640 }
641 
642 /* Is this a wildcard address? */
643 static int sctp_v6_is_any(const union sctp_addr *addr)
644 {
645         return ipv6_addr_any(&addr->v6.sin6_addr);
646 }
647 
648 /* Should this be available for binding?   */
649 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
650 {
651         int type;
652         struct net *net = sock_net(&sp->inet.sk);
653         const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
654 
655         type = ipv6_addr_type(in6);
656         if (IPV6_ADDR_ANY == type)
657                 return 1;
658         if (type == IPV6_ADDR_MAPPED) {
659                 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
660                         return 0;
661                 sctp_v6_map_v4(addr);
662                 return sctp_get_af_specific(AF_INET)->available(addr, sp);
663         }
664         if (!(type & IPV6_ADDR_UNICAST))
665                 return 0;
666 
667         return ipv6_can_nonlocal_bind(net, &sp->inet) ||
668                ipv6_chk_addr(net, in6, NULL, 0);
669 }
670 
671 /* This function checks if the address is a valid address to be used for
672  * SCTP.
673  *
674  * Output:
675  * Return 0 - If the address is a non-unicast or an illegal address.
676  * Return 1 - If the address is a unicast.
677  */
678 static int sctp_v6_addr_valid(union sctp_addr *addr,
679                               struct sctp_sock *sp,
680                               const struct sk_buff *skb)
681 {
682         int ret = ipv6_addr_type(&addr->v6.sin6_addr);
683 
684         /* Support v4-mapped-v6 address. */
685         if (ret == IPV6_ADDR_MAPPED) {
686                 /* Note: This routine is used in input, so v4-mapped-v6
687                  * are disallowed here when there is no sctp_sock.
688                  */
689                 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
690                         return 0;
691                 sctp_v6_map_v4(addr);
692                 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
693         }
694 
695         /* Is this a non-unicast address */
696         if (!(ret & IPV6_ADDR_UNICAST))
697                 return 0;
698 
699         return 1;
700 }
701 
702 /* What is the scope of 'addr'?  */
703 static enum sctp_scope sctp_v6_scope(union sctp_addr *addr)
704 {
705         enum sctp_scope retval;
706         int v6scope;
707 
708         /* The IPv6 scope is really a set of bit fields.
709          * See IFA_* in <net/if_inet6.h>.  Map to a generic SCTP scope.
710          */
711 
712         v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
713         switch (v6scope) {
714         case IFA_HOST:
715                 retval = SCTP_SCOPE_LOOPBACK;
716                 break;
717         case IFA_LINK:
718                 retval = SCTP_SCOPE_LINK;
719                 break;
720         case IFA_SITE:
721                 retval = SCTP_SCOPE_PRIVATE;
722                 break;
723         default:
724                 retval = SCTP_SCOPE_GLOBAL;
725                 break;
726         }
727 
728         return retval;
729 }
730 
731 /* Create and initialize a new sk for the socket to be returned by accept(). */
732 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
733                                              struct sctp_association *asoc,
734                                              bool kern)
735 {
736         struct sock *newsk;
737         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
738         struct sctp6_sock *newsctp6sk;
739 
740         newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, kern);
741         if (!newsk)
742                 goto out;
743 
744         sock_init_data(NULL, newsk);
745 
746         sctp_copy_sock(newsk, sk, asoc);
747         sock_reset_flag(sk, SOCK_ZAPPED);
748 
749         newsctp6sk = (struct sctp6_sock *)newsk;
750         inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
751 
752         sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
753 
754         newnp = inet6_sk(newsk);
755 
756         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
757         newnp->ipv6_mc_list = NULL;
758         newnp->ipv6_ac_list = NULL;
759         newnp->ipv6_fl_list = NULL;
760 
761         sctp_v6_copy_ip_options(sk, newsk);
762 
763         /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
764          * and getpeername().
765          */
766         sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
767 
768         newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
769 
770         sk_refcnt_debug_inc(newsk);
771 
772         if (newsk->sk_prot->init(newsk)) {
773                 sk_common_release(newsk);
774                 newsk = NULL;
775         }
776 
777 out:
778         return newsk;
779 }
780 
781 /* Format a sockaddr for return to user space. This makes sure the return is
782  * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
783  */
784 static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
785 {
786         if (sp->v4mapped) {
787                 if (addr->sa.sa_family == AF_INET)
788                         sctp_v4_map_v6(addr);
789         } else {
790                 if (addr->sa.sa_family == AF_INET6 &&
791                     ipv6_addr_v4mapped(&addr->v6.sin6_addr))
792                         sctp_v6_map_v4(addr);
793         }
794 
795         if (addr->sa.sa_family == AF_INET) {
796                 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
797                 return sizeof(struct sockaddr_in);
798         }
799         return sizeof(struct sockaddr_in6);
800 }
801 
802 /* Where did this skb come from?  */
803 static int sctp_v6_skb_iif(const struct sk_buff *skb)
804 {
805         return IP6CB(skb)->iif;
806 }
807 
808 /* Was this packet marked by Explicit Congestion Notification? */
809 static int sctp_v6_is_ce(const struct sk_buff *skb)
810 {
811         return *((__u32 *)(ipv6_hdr(skb))) & (__force __u32)htonl(1 << 20);
812 }
813 
814 /* Dump the v6 addr to the seq file. */
815 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
816 {
817         seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
818 }
819 
820 static void sctp_v6_ecn_capable(struct sock *sk)
821 {
822         inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
823 }
824 
825 /* Initialize a PF_INET msgname from a ulpevent. */
826 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
827                                      char *msgname, int *addrlen)
828 {
829         union sctp_addr *addr;
830         struct sctp_association *asoc;
831         union sctp_addr *paddr;
832 
833         if (!msgname)
834                 return;
835 
836         addr = (union sctp_addr *)msgname;
837         asoc = event->asoc;
838         paddr = &asoc->peer.primary_addr;
839 
840         if (paddr->sa.sa_family == AF_INET) {
841                 addr->v4.sin_family = AF_INET;
842                 addr->v4.sin_port = htons(asoc->peer.port);
843                 addr->v4.sin_addr = paddr->v4.sin_addr;
844         } else {
845                 addr->v6.sin6_family = AF_INET6;
846                 addr->v6.sin6_flowinfo = 0;
847                 if (ipv6_addr_type(&paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
848                         addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id;
849                 else
850                         addr->v6.sin6_scope_id = 0;
851                 addr->v6.sin6_port = htons(asoc->peer.port);
852                 addr->v6.sin6_addr = paddr->v6.sin6_addr;
853         }
854 
855         *addrlen = sctp_v6_addr_to_user(sctp_sk(asoc->base.sk), addr);
856 }
857 
858 /* Initialize a msg_name from an inbound skb. */
859 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
860                                    int *addr_len)
861 {
862         union sctp_addr *addr;
863         struct sctphdr *sh;
864 
865         if (!msgname)
866                 return;
867 
868         addr = (union sctp_addr *)msgname;
869         sh = sctp_hdr(skb);
870 
871         if (ip_hdr(skb)->version == 4) {
872                 addr->v4.sin_family = AF_INET;
873                 addr->v4.sin_port = sh->source;
874                 addr->v4.sin_addr.s_addr = ip_hdr(skb)->saddr;
875         } else {
876                 addr->v6.sin6_family = AF_INET6;
877                 addr->v6.sin6_flowinfo = 0;
878                 addr->v6.sin6_port = sh->source;
879                 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
880                 if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
881                         addr->v6.sin6_scope_id = sctp_v6_skb_iif(skb);
882                 else
883                         addr->v6.sin6_scope_id = 0;
884         }
885 
886         *addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr);
887 }
888 
889 /* Do we support this AF? */
890 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
891 {
892         switch (family) {
893         case AF_INET6:
894                 return 1;
895         /* v4-mapped-v6 addresses */
896         case AF_INET:
897                 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
898                         return 1;
899                 fallthrough;
900         default:
901                 return 0;
902         }
903 }
904 
905 /* Address matching with wildcards allowed.  This extra level
906  * of indirection lets us choose whether a PF_INET6 should
907  * disallow any v4 addresses if we so choose.
908  */
909 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
910                                const union sctp_addr *addr2,
911                                struct sctp_sock *opt)
912 {
913         struct sock *sk = sctp_opt2sk(opt);
914         struct sctp_af *af1, *af2;
915 
916         af1 = sctp_get_af_specific(addr1->sa.sa_family);
917         af2 = sctp_get_af_specific(addr2->sa.sa_family);
918 
919         if (!af1 || !af2)
920                 return 0;
921 
922         /* If the socket is IPv6 only, v4 addrs will not match */
923         if (__ipv6_only_sock(sk) && af1 != af2)
924                 return 0;
925 
926         /* Today, wildcard AF_INET/AF_INET6. */
927         if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
928                 return 1;
929 
930         if (addr1->sa.sa_family == AF_INET && addr2->sa.sa_family == AF_INET)
931                 return addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr;
932 
933         return __sctp_v6_cmp_addr(addr1, addr2);
934 }
935 
936 /* Verify that the provided sockaddr looks bindable.   Common verification,
937  * has already been taken care of.
938  */
939 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
940 {
941         struct sctp_af *af;
942 
943         /* ASSERT: address family has already been verified. */
944         if (addr->sa.sa_family != AF_INET6)
945                 af = sctp_get_af_specific(addr->sa.sa_family);
946         else {
947                 int type = ipv6_addr_type(&addr->v6.sin6_addr);
948                 struct net_device *dev;
949 
950                 if (type & IPV6_ADDR_LINKLOCAL) {
951                         struct net *net;
952                         if (!addr->v6.sin6_scope_id)
953                                 return 0;
954                         net = sock_net(&opt->inet.sk);
955                         rcu_read_lock();
956                         dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
957                         if (!dev || !(ipv6_can_nonlocal_bind(net, &opt->inet) ||
958                                       ipv6_chk_addr(net, &addr->v6.sin6_addr,
959                                                     dev, 0))) {
960                                 rcu_read_unlock();
961                                 return 0;
962                         }
963                         rcu_read_unlock();
964                 }
965 
966                 af = opt->pf->af;
967         }
968         return af->available(addr, opt);
969 }
970 
971 /* Verify that the provided sockaddr looks sendable.   Common verification,
972  * has already been taken care of.
973  */
974 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
975 {
976         struct sctp_af *af = NULL;
977 
978         /* ASSERT: address family has already been verified. */
979         if (addr->sa.sa_family != AF_INET6)
980                 af = sctp_get_af_specific(addr->sa.sa_family);
981         else {
982                 int type = ipv6_addr_type(&addr->v6.sin6_addr);
983                 struct net_device *dev;
984 
985                 if (type & IPV6_ADDR_LINKLOCAL) {
986                         if (!addr->v6.sin6_scope_id)
987                                 return 0;
988                         rcu_read_lock();
989                         dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
990                                                    addr->v6.sin6_scope_id);
991                         rcu_read_unlock();
992                         if (!dev)
993                                 return 0;
994                 }
995                 af = opt->pf->af;
996         }
997 
998         return af != NULL;
999 }
1000 
1001 /* Fill in Supported Address Type information for INIT and INIT-ACK
1002  * chunks.   Note: In the future, we may want to look at sock options
1003  * to determine whether a PF_INET6 socket really wants to have IPV4
1004  * addresses.
1005  * Returns number of addresses supported.
1006  */
1007 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
1008                                       __be16 *types)
1009 {
1010         types[0] = SCTP_PARAM_IPV6_ADDRESS;
1011         if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
1012                 types[1] = SCTP_PARAM_IPV4_ADDRESS;
1013                 return 2;
1014         }
1015         return 1;
1016 }
1017 
1018 /* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
1019 static int sctp_getname(struct socket *sock, struct sockaddr *uaddr,
1020                         int peer)
1021 {
1022         int rc;
1023 
1024         rc = inet6_getname(sock, uaddr, peer);
1025 
1026         if (rc < 0)
1027                 return rc;
1028 
1029         rc = sctp_v6_addr_to_user(sctp_sk(sock->sk),
1030                                           (union sctp_addr *)uaddr);
1031 
1032         return rc;
1033 }
1034 
1035 static const struct proto_ops inet6_seqpacket_ops = {
1036         .family            = PF_INET6,
1037         .owner             = THIS_MODULE,
1038         .release           = inet6_release,
1039         .bind              = inet6_bind,
1040         .connect           = sctp_inet_connect,
1041         .socketpair        = sock_no_socketpair,
1042         .accept            = inet_accept,
1043         .getname           = sctp_getname,
1044         .poll              = sctp_poll,
1045         .ioctl             = inet6_ioctl,
1046         .gettstamp         = sock_gettstamp,
1047         .listen            = sctp_inet_listen,
1048         .shutdown          = inet_shutdown,
1049         .setsockopt        = sock_common_setsockopt,
1050         .getsockopt        = sock_common_getsockopt,
1051         .sendmsg           = inet_sendmsg,
1052         .recvmsg           = inet_recvmsg,
1053         .mmap              = sock_no_mmap,
1054 #ifdef CONFIG_COMPAT
1055         .compat_ioctl      = inet6_compat_ioctl,
1056 #endif
1057 };
1058 
1059 static struct inet_protosw sctpv6_seqpacket_protosw = {
1060         .type          = SOCK_SEQPACKET,
1061         .protocol      = IPPROTO_SCTP,
1062         .prot          = &sctpv6_prot,
1063         .ops           = &inet6_seqpacket_ops,
1064         .flags         = SCTP_PROTOSW_FLAG
1065 };
1066 static struct inet_protosw sctpv6_stream_protosw = {
1067         .type          = SOCK_STREAM,
1068         .protocol      = IPPROTO_SCTP,
1069         .prot          = &sctpv6_prot,
1070         .ops           = &inet6_seqpacket_ops,
1071         .flags         = SCTP_PROTOSW_FLAG,
1072 };
1073 
1074 static int sctp6_rcv(struct sk_buff *skb)
1075 {
1076         SCTP_INPUT_CB(skb)->encap_port = 0;
1077         return sctp_rcv(skb) ? -1 : 0;
1078 }
1079 
1080 static const struct inet6_protocol sctpv6_protocol = {
1081         .handler      = sctp6_rcv,
1082         .err_handler  = sctp_v6_err,
1083         .flags        = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1084 };
1085 
1086 static struct sctp_af sctp_af_inet6 = {
1087         .sa_family         = AF_INET6,
1088         .sctp_xmit         = sctp_v6_xmit,
1089         .setsockopt        = ipv6_setsockopt,
1090         .getsockopt        = ipv6_getsockopt,
1091         .get_dst           = sctp_v6_get_dst,
1092         .get_saddr         = sctp_v6_get_saddr,
1093         .copy_addrlist     = sctp_v6_copy_addrlist,
1094         .from_skb          = sctp_v6_from_skb,
1095         .from_sk           = sctp_v6_from_sk,
1096         .from_addr_param   = sctp_v6_from_addr_param,
1097         .to_addr_param     = sctp_v6_to_addr_param,
1098         .cmp_addr          = sctp_v6_cmp_addr,
1099         .scope             = sctp_v6_scope,
1100         .addr_valid        = sctp_v6_addr_valid,
1101         .inaddr_any        = sctp_v6_inaddr_any,
1102         .is_any            = sctp_v6_is_any,
1103         .available         = sctp_v6_available,
1104         .skb_iif           = sctp_v6_skb_iif,
1105         .is_ce             = sctp_v6_is_ce,
1106         .seq_dump_addr     = sctp_v6_seq_dump_addr,
1107         .ecn_capable       = sctp_v6_ecn_capable,
1108         .net_header_len    = sizeof(struct ipv6hdr),
1109         .sockaddr_len      = sizeof(struct sockaddr_in6),
1110         .ip_options_len    = sctp_v6_ip_options_len,
1111 };
1112 
1113 static struct sctp_pf sctp_pf_inet6 = {
1114         .event_msgname = sctp_inet6_event_msgname,
1115         .skb_msgname   = sctp_inet6_skb_msgname,
1116         .af_supported  = sctp_inet6_af_supported,
1117         .cmp_addr      = sctp_inet6_cmp_addr,
1118         .bind_verify   = sctp_inet6_bind_verify,
1119         .send_verify   = sctp_inet6_send_verify,
1120         .supported_addrs = sctp_inet6_supported_addrs,
1121         .create_accept_sk = sctp_v6_create_accept_sk,
1122         .addr_to_user  = sctp_v6_addr_to_user,
1123         .to_sk_saddr   = sctp_v6_to_sk_saddr,
1124         .to_sk_daddr   = sctp_v6_to_sk_daddr,
1125         .copy_ip_options = sctp_v6_copy_ip_options,
1126         .af            = &sctp_af_inet6,
1127 };
1128 
1129 /* Initialize IPv6 support and register with socket layer.  */
1130 void sctp_v6_pf_init(void)
1131 {
1132         /* Register the SCTP specific PF_INET6 functions. */
1133         sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1134 
1135         /* Register the SCTP specific AF_INET6 functions. */
1136         sctp_register_af(&sctp_af_inet6);
1137 }
1138 
1139 void sctp_v6_pf_exit(void)
1140 {
1141         list_del(&sctp_af_inet6.list);
1142 }
1143 
1144 /* Initialize IPv6 support and register with socket layer.  */
1145 int sctp_v6_protosw_init(void)
1146 {
1147         int rc;
1148 
1149         rc = proto_register(&sctpv6_prot, 1);
1150         if (rc)
1151                 return rc;
1152 
1153         /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1154         inet6_register_protosw(&sctpv6_seqpacket_protosw);
1155         inet6_register_protosw(&sctpv6_stream_protosw);
1156 
1157         return 0;
1158 }
1159 
1160 void sctp_v6_protosw_exit(void)
1161 {
1162         inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1163         inet6_unregister_protosw(&sctpv6_stream_protosw);
1164         proto_unregister(&sctpv6_prot);
1165 }
1166 
1167 
1168 /* Register with inet6 layer. */
1169 int sctp_v6_add_protocol(void)
1170 {
1171         /* Register notifier for inet6 address additions/deletions. */
1172         register_inet6addr_notifier(&sctp_inet6addr_notifier);
1173 
1174         if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1175                 return -EAGAIN;
1176 
1177         return 0;
1178 }
1179 
1180 /* Unregister with inet6 layer. */
1181 void sctp_v6_del_protocol(void)
1182 {
1183         inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1184         unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1185 }
1186 

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