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TOMOYO Linux Cross Reference
Linux/net/ipv6/af_inet6.c

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  1 /*
  2  *      PF_INET6 socket protocol family
  3  *      Linux INET6 implementation
  4  *
  5  *      Authors:
  6  *      Pedro Roque             <roque@di.fc.ul.pt>
  7  *
  8  *      Adapted from linux/net/ipv4/af_inet.c
  9  *
 10  *      Fixes:
 11  *      piggy, Karl Knutson     :       Socket protocol table
 12  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
 13  *      Arnaldo Melo            :       check proc_net_create return, cleanups
 14  *
 15  *      This program is free software; you can redistribute it and/or
 16  *      modify it under the terms of the GNU General Public License
 17  *      as published by the Free Software Foundation; either version
 18  *      2 of the License, or (at your option) any later version.
 19  */
 20 
 21 #define pr_fmt(fmt) "IPv6: " fmt
 22 
 23 #include <linux/module.h>
 24 #include <linux/capability.h>
 25 #include <linux/errno.h>
 26 #include <linux/types.h>
 27 #include <linux/socket.h>
 28 #include <linux/in.h>
 29 #include <linux/kernel.h>
 30 #include <linux/timer.h>
 31 #include <linux/string.h>
 32 #include <linux/sockios.h>
 33 #include <linux/net.h>
 34 #include <linux/fcntl.h>
 35 #include <linux/mm.h>
 36 #include <linux/interrupt.h>
 37 #include <linux/proc_fs.h>
 38 #include <linux/stat.h>
 39 #include <linux/init.h>
 40 #include <linux/slab.h>
 41 
 42 #include <linux/inet.h>
 43 #include <linux/netdevice.h>
 44 #include <linux/icmpv6.h>
 45 #include <linux/netfilter_ipv6.h>
 46 
 47 #include <net/ip.h>
 48 #include <net/ipv6.h>
 49 #include <net/udp.h>
 50 #include <net/udplite.h>
 51 #include <net/tcp.h>
 52 #include <net/ipip.h>
 53 #include <net/protocol.h>
 54 #include <net/inet_common.h>
 55 #include <net/route.h>
 56 #include <net/transp_v6.h>
 57 #include <net/ip6_route.h>
 58 #include <net/addrconf.h>
 59 #ifdef CONFIG_IPV6_TUNNEL
 60 #include <net/ip6_tunnel.h>
 61 #endif
 62 
 63 #include <asm/uaccess.h>
 64 #include <linux/mroute6.h>
 65 
 66 MODULE_AUTHOR("Cast of dozens");
 67 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
 68 MODULE_LICENSE("GPL");
 69 
 70 /* The inetsw6 table contains everything that inet6_create needs to
 71  * build a new socket.
 72  */
 73 static struct list_head inetsw6[SOCK_MAX];
 74 static DEFINE_SPINLOCK(inetsw6_lock);
 75 
 76 struct ipv6_params ipv6_defaults = {
 77         .disable_ipv6 = 0,
 78         .autoconf = 1,
 79 };
 80 
 81 static int disable_ipv6_mod;
 82 
 83 module_param_named(disable, disable_ipv6_mod, int, 0444);
 84 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
 85 
 86 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
 87 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
 88 
 89 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
 90 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
 91 
 92 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 93 {
 94         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
 95 
 96         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 97 }
 98 
 99 static int inet6_create(struct net *net, struct socket *sock, int protocol,
100                         int kern)
101 {
102         struct inet_sock *inet;
103         struct ipv6_pinfo *np;
104         struct sock *sk;
105         struct inet_protosw *answer;
106         struct proto *answer_prot;
107         unsigned char answer_flags;
108         char answer_no_check;
109         int try_loading_module = 0;
110         int err;
111 
112         if (sock->type != SOCK_RAW &&
113             sock->type != SOCK_DGRAM &&
114             !inet_ehash_secret)
115                 build_ehash_secret();
116 
117         /* Look for the requested type/protocol pair. */
118 lookup_protocol:
119         err = -ESOCKTNOSUPPORT;
120         rcu_read_lock();
121         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
122 
123                 err = 0;
124                 /* Check the non-wild match. */
125                 if (protocol == answer->protocol) {
126                         if (protocol != IPPROTO_IP)
127                                 break;
128                 } else {
129                         /* Check for the two wild cases. */
130                         if (IPPROTO_IP == protocol) {
131                                 protocol = answer->protocol;
132                                 break;
133                         }
134                         if (IPPROTO_IP == answer->protocol)
135                                 break;
136                 }
137                 err = -EPROTONOSUPPORT;
138         }
139 
140         if (err) {
141                 if (try_loading_module < 2) {
142                         rcu_read_unlock();
143                         /*
144                          * Be more specific, e.g. net-pf-10-proto-132-type-1
145                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
146                          */
147                         if (++try_loading_module == 1)
148                                 request_module("net-pf-%d-proto-%d-type-%d",
149                                                 PF_INET6, protocol, sock->type);
150                         /*
151                          * Fall back to generic, e.g. net-pf-10-proto-132
152                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
153                          */
154                         else
155                                 request_module("net-pf-%d-proto-%d",
156                                                 PF_INET6, protocol);
157                         goto lookup_protocol;
158                 } else
159                         goto out_rcu_unlock;
160         }
161 
162         err = -EPERM;
163         if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
164                 goto out_rcu_unlock;
165 
166         sock->ops = answer->ops;
167         answer_prot = answer->prot;
168         answer_no_check = answer->no_check;
169         answer_flags = answer->flags;
170         rcu_read_unlock();
171 
172         WARN_ON(answer_prot->slab == NULL);
173 
174         err = -ENOBUFS;
175         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
176         if (sk == NULL)
177                 goto out;
178 
179         sock_init_data(sock, sk);
180 
181         err = 0;
182         sk->sk_no_check = answer_no_check;
183         if (INET_PROTOSW_REUSE & answer_flags)
184                 sk->sk_reuse = SK_CAN_REUSE;
185 
186         inet = inet_sk(sk);
187         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
188 
189         if (SOCK_RAW == sock->type) {
190                 inet->inet_num = protocol;
191                 if (IPPROTO_RAW == protocol)
192                         inet->hdrincl = 1;
193         }
194 
195         sk->sk_destruct         = inet_sock_destruct;
196         sk->sk_family           = PF_INET6;
197         sk->sk_protocol         = protocol;
198 
199         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
200 
201         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
202         np->hop_limit   = -1;
203         np->mcast_hops  = IPV6_DEFAULT_MCASTHOPS;
204         np->mc_loop     = 1;
205         np->pmtudisc    = IPV6_PMTUDISC_WANT;
206         np->ipv6only    = net->ipv6.sysctl.bindv6only;
207 
208         /* Init the ipv4 part of the socket since we can have sockets
209          * using v6 API for ipv4.
210          */
211         inet->uc_ttl    = -1;
212 
213         inet->mc_loop   = 1;
214         inet->mc_ttl    = 1;
215         inet->mc_index  = 0;
216         inet->mc_list   = NULL;
217         inet->rcv_tos   = 0;
218 
219         if (ipv4_config.no_pmtu_disc)
220                 inet->pmtudisc = IP_PMTUDISC_DONT;
221         else
222                 inet->pmtudisc = IP_PMTUDISC_WANT;
223         /*
224          * Increment only the relevant sk_prot->socks debug field, this changes
225          * the previous behaviour of incrementing both the equivalent to
226          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
227          *
228          * This allows better debug granularity as we'll know exactly how many
229          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
230          * transport protocol socks. -acme
231          */
232         sk_refcnt_debug_inc(sk);
233 
234         if (inet->inet_num) {
235                 /* It assumes that any protocol which allows
236                  * the user to assign a number at socket
237                  * creation time automatically shares.
238                  */
239                 inet->inet_sport = htons(inet->inet_num);
240                 sk->sk_prot->hash(sk);
241         }
242         if (sk->sk_prot->init) {
243                 err = sk->sk_prot->init(sk);
244                 if (err) {
245                         sk_common_release(sk);
246                         goto out;
247                 }
248         }
249 out:
250         return err;
251 out_rcu_unlock:
252         rcu_read_unlock();
253         goto out;
254 }
255 
256 
257 /* bind for INET6 API */
258 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
259 {
260         struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
261         struct sock *sk = sock->sk;
262         struct inet_sock *inet = inet_sk(sk);
263         struct ipv6_pinfo *np = inet6_sk(sk);
264         struct net *net = sock_net(sk);
265         __be32 v4addr = 0;
266         unsigned short snum;
267         int addr_type = 0;
268         int err = 0;
269 
270         /* If the socket has its own bind function then use it. */
271         if (sk->sk_prot->bind)
272                 return sk->sk_prot->bind(sk, uaddr, addr_len);
273 
274         if (addr_len < SIN6_LEN_RFC2133)
275                 return -EINVAL;
276 
277         if (addr->sin6_family != AF_INET6)
278                 return -EAFNOSUPPORT;
279 
280         addr_type = ipv6_addr_type(&addr->sin6_addr);
281         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
282                 return -EINVAL;
283 
284         snum = ntohs(addr->sin6_port);
285         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
286                 return -EACCES;
287 
288         lock_sock(sk);
289 
290         /* Check these errors (active socket, double bind). */
291         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
292                 err = -EINVAL;
293                 goto out;
294         }
295 
296         /* Check if the address belongs to the host. */
297         if (addr_type == IPV6_ADDR_MAPPED) {
298                 int chk_addr_ret;
299 
300                 /* Binding to v4-mapped address on a v6-only socket
301                  * makes no sense
302                  */
303                 if (np->ipv6only) {
304                         err = -EINVAL;
305                         goto out;
306                 }
307 
308                 /* Reproduce AF_INET checks to make the bindings consistent */
309                 v4addr = addr->sin6_addr.s6_addr32[3];
310                 chk_addr_ret = inet_addr_type(net, v4addr);
311                 if (!sysctl_ip_nonlocal_bind &&
312                     !(inet->freebind || inet->transparent) &&
313                     v4addr != htonl(INADDR_ANY) &&
314                     chk_addr_ret != RTN_LOCAL &&
315                     chk_addr_ret != RTN_MULTICAST &&
316                     chk_addr_ret != RTN_BROADCAST) {
317                         err = -EADDRNOTAVAIL;
318                         goto out;
319                 }
320         } else {
321                 if (addr_type != IPV6_ADDR_ANY) {
322                         struct net_device *dev = NULL;
323 
324                         rcu_read_lock();
325                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
326                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
327                                     addr->sin6_scope_id) {
328                                         /* Override any existing binding, if another one
329                                          * is supplied by user.
330                                          */
331                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
332                                 }
333 
334                                 /* Binding to link-local address requires an interface */
335                                 if (!sk->sk_bound_dev_if) {
336                                         err = -EINVAL;
337                                         goto out_unlock;
338                                 }
339                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
340                                 if (!dev) {
341                                         err = -ENODEV;
342                                         goto out_unlock;
343                                 }
344                         }
345 
346                         /* ipv4 addr of the socket is invalid.  Only the
347                          * unspecified and mapped address have a v4 equivalent.
348                          */
349                         v4addr = LOOPBACK4_IPV6;
350                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
351                                 if (!(inet->freebind || inet->transparent) &&
352                                     !ipv6_chk_addr(net, &addr->sin6_addr,
353                                                    dev, 0)) {
354                                         err = -EADDRNOTAVAIL;
355                                         goto out_unlock;
356                                 }
357                         }
358                         rcu_read_unlock();
359                 }
360         }
361 
362         inet->inet_rcv_saddr = v4addr;
363         inet->inet_saddr = v4addr;
364 
365         np->rcv_saddr = addr->sin6_addr;
366 
367         if (!(addr_type & IPV6_ADDR_MULTICAST))
368                 np->saddr = addr->sin6_addr;
369 
370         /* Make sure we are allowed to bind here. */
371         if (sk->sk_prot->get_port(sk, snum)) {
372                 inet_reset_saddr(sk);
373                 err = -EADDRINUSE;
374                 goto out;
375         }
376 
377         if (addr_type != IPV6_ADDR_ANY) {
378                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
379                 if (addr_type != IPV6_ADDR_MAPPED)
380                         np->ipv6only = 1;
381         }
382         if (snum)
383                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
384         inet->inet_sport = htons(inet->inet_num);
385         inet->inet_dport = 0;
386         inet->inet_daddr = 0;
387 out:
388         release_sock(sk);
389         return err;
390 out_unlock:
391         rcu_read_unlock();
392         goto out;
393 }
394 EXPORT_SYMBOL(inet6_bind);
395 
396 int inet6_release(struct socket *sock)
397 {
398         struct sock *sk = sock->sk;
399 
400         if (sk == NULL)
401                 return -EINVAL;
402 
403         /* Free mc lists */
404         ipv6_sock_mc_close(sk);
405 
406         /* Free ac lists */
407         ipv6_sock_ac_close(sk);
408 
409         return inet_release(sock);
410 }
411 EXPORT_SYMBOL(inet6_release);
412 
413 void inet6_destroy_sock(struct sock *sk)
414 {
415         struct ipv6_pinfo *np = inet6_sk(sk);
416         struct sk_buff *skb;
417         struct ipv6_txoptions *opt;
418 
419         /* Release rx options */
420 
421         skb = xchg(&np->pktoptions, NULL);
422         if (skb != NULL)
423                 kfree_skb(skb);
424 
425         skb = xchg(&np->rxpmtu, NULL);
426         if (skb != NULL)
427                 kfree_skb(skb);
428 
429         /* Free flowlabels */
430         fl6_free_socklist(sk);
431 
432         /* Free tx options */
433 
434         opt = xchg(&np->opt, NULL);
435         if (opt != NULL)
436                 sock_kfree_s(sk, opt, opt->tot_len);
437 }
438 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
439 
440 /*
441  *      This does both peername and sockname.
442  */
443 
444 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
445                  int *uaddr_len, int peer)
446 {
447         struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
448         struct sock *sk = sock->sk;
449         struct inet_sock *inet = inet_sk(sk);
450         struct ipv6_pinfo *np = inet6_sk(sk);
451 
452         sin->sin6_family = AF_INET6;
453         sin->sin6_flowinfo = 0;
454         sin->sin6_scope_id = 0;
455         if (peer) {
456                 if (!inet->inet_dport)
457                         return -ENOTCONN;
458                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
459                     peer == 1)
460                         return -ENOTCONN;
461                 sin->sin6_port = inet->inet_dport;
462                 sin->sin6_addr = np->daddr;
463                 if (np->sndflow)
464                         sin->sin6_flowinfo = np->flow_label;
465         } else {
466                 if (ipv6_addr_any(&np->rcv_saddr))
467                         sin->sin6_addr = np->saddr;
468                 else
469                         sin->sin6_addr = np->rcv_saddr;
470 
471                 sin->sin6_port = inet->inet_sport;
472         }
473         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
474                 sin->sin6_scope_id = sk->sk_bound_dev_if;
475         *uaddr_len = sizeof(*sin);
476         return 0;
477 }
478 EXPORT_SYMBOL(inet6_getname);
479 
480 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
481 {
482         struct sock *sk = sock->sk;
483         struct net *net = sock_net(sk);
484 
485         switch (cmd) {
486         case SIOCGSTAMP:
487                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
488 
489         case SIOCGSTAMPNS:
490                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
491 
492         case SIOCADDRT:
493         case SIOCDELRT:
494 
495                 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
496 
497         case SIOCSIFADDR:
498                 return addrconf_add_ifaddr(net, (void __user *) arg);
499         case SIOCDIFADDR:
500                 return addrconf_del_ifaddr(net, (void __user *) arg);
501         case SIOCSIFDSTADDR:
502                 return addrconf_set_dstaddr(net, (void __user *) arg);
503         default:
504                 if (!sk->sk_prot->ioctl)
505                         return -ENOIOCTLCMD;
506                 return sk->sk_prot->ioctl(sk, cmd, arg);
507         }
508         /*NOTREACHED*/
509         return 0;
510 }
511 EXPORT_SYMBOL(inet6_ioctl);
512 
513 const struct proto_ops inet6_stream_ops = {
514         .family            = PF_INET6,
515         .owner             = THIS_MODULE,
516         .release           = inet6_release,
517         .bind              = inet6_bind,
518         .connect           = inet_stream_connect,       /* ok           */
519         .socketpair        = sock_no_socketpair,        /* a do nothing */
520         .accept            = inet_accept,               /* ok           */
521         .getname           = inet6_getname,
522         .poll              = tcp_poll,                  /* ok           */
523         .ioctl             = inet6_ioctl,               /* must change  */
524         .listen            = inet_listen,               /* ok           */
525         .shutdown          = inet_shutdown,             /* ok           */
526         .setsockopt        = sock_common_setsockopt,    /* ok           */
527         .getsockopt        = sock_common_getsockopt,    /* ok           */
528         .sendmsg           = inet_sendmsg,              /* ok           */
529         .recvmsg           = inet_recvmsg,              /* ok           */
530         .mmap              = sock_no_mmap,
531         .sendpage          = inet_sendpage,
532         .splice_read       = tcp_splice_read,
533 #ifdef CONFIG_COMPAT
534         .compat_setsockopt = compat_sock_common_setsockopt,
535         .compat_getsockopt = compat_sock_common_getsockopt,
536 #endif
537 };
538 
539 const struct proto_ops inet6_dgram_ops = {
540         .family            = PF_INET6,
541         .owner             = THIS_MODULE,
542         .release           = inet6_release,
543         .bind              = inet6_bind,
544         .connect           = inet_dgram_connect,        /* ok           */
545         .socketpair        = sock_no_socketpair,        /* a do nothing */
546         .accept            = sock_no_accept,            /* a do nothing */
547         .getname           = inet6_getname,
548         .poll              = udp_poll,                  /* ok           */
549         .ioctl             = inet6_ioctl,               /* must change  */
550         .listen            = sock_no_listen,            /* ok           */
551         .shutdown          = inet_shutdown,             /* ok           */
552         .setsockopt        = sock_common_setsockopt,    /* ok           */
553         .getsockopt        = sock_common_getsockopt,    /* ok           */
554         .sendmsg           = inet_sendmsg,              /* ok           */
555         .recvmsg           = inet_recvmsg,              /* ok           */
556         .mmap              = sock_no_mmap,
557         .sendpage          = sock_no_sendpage,
558 #ifdef CONFIG_COMPAT
559         .compat_setsockopt = compat_sock_common_setsockopt,
560         .compat_getsockopt = compat_sock_common_getsockopt,
561 #endif
562 };
563 
564 static const struct net_proto_family inet6_family_ops = {
565         .family = PF_INET6,
566         .create = inet6_create,
567         .owner  = THIS_MODULE,
568 };
569 
570 int inet6_register_protosw(struct inet_protosw *p)
571 {
572         struct list_head *lh;
573         struct inet_protosw *answer;
574         struct list_head *last_perm;
575         int protocol = p->protocol;
576         int ret;
577 
578         spin_lock_bh(&inetsw6_lock);
579 
580         ret = -EINVAL;
581         if (p->type >= SOCK_MAX)
582                 goto out_illegal;
583 
584         /* If we are trying to override a permanent protocol, bail. */
585         answer = NULL;
586         ret = -EPERM;
587         last_perm = &inetsw6[p->type];
588         list_for_each(lh, &inetsw6[p->type]) {
589                 answer = list_entry(lh, struct inet_protosw, list);
590 
591                 /* Check only the non-wild match. */
592                 if (INET_PROTOSW_PERMANENT & answer->flags) {
593                         if (protocol == answer->protocol)
594                                 break;
595                         last_perm = lh;
596                 }
597 
598                 answer = NULL;
599         }
600         if (answer)
601                 goto out_permanent;
602 
603         /* Add the new entry after the last permanent entry if any, so that
604          * the new entry does not override a permanent entry when matched with
605          * a wild-card protocol. But it is allowed to override any existing
606          * non-permanent entry.  This means that when we remove this entry, the
607          * system automatically returns to the old behavior.
608          */
609         list_add_rcu(&p->list, last_perm);
610         ret = 0;
611 out:
612         spin_unlock_bh(&inetsw6_lock);
613         return ret;
614 
615 out_permanent:
616         pr_err("Attempt to override permanent protocol %d\n", protocol);
617         goto out;
618 
619 out_illegal:
620         pr_err("Ignoring attempt to register invalid socket type %d\n",
621                p->type);
622         goto out;
623 }
624 EXPORT_SYMBOL(inet6_register_protosw);
625 
626 void
627 inet6_unregister_protosw(struct inet_protosw *p)
628 {
629         if (INET_PROTOSW_PERMANENT & p->flags) {
630                 pr_err("Attempt to unregister permanent protocol %d\n",
631                        p->protocol);
632         } else {
633                 spin_lock_bh(&inetsw6_lock);
634                 list_del_rcu(&p->list);
635                 spin_unlock_bh(&inetsw6_lock);
636 
637                 synchronize_net();
638         }
639 }
640 EXPORT_SYMBOL(inet6_unregister_protosw);
641 
642 int inet6_sk_rebuild_header(struct sock *sk)
643 {
644         struct ipv6_pinfo *np = inet6_sk(sk);
645         struct dst_entry *dst;
646 
647         dst = __sk_dst_check(sk, np->dst_cookie);
648 
649         if (dst == NULL) {
650                 struct inet_sock *inet = inet_sk(sk);
651                 struct in6_addr *final_p, final;
652                 struct flowi6 fl6;
653 
654                 memset(&fl6, 0, sizeof(fl6));
655                 fl6.flowi6_proto = sk->sk_protocol;
656                 fl6.daddr = np->daddr;
657                 fl6.saddr = np->saddr;
658                 fl6.flowlabel = np->flow_label;
659                 fl6.flowi6_oif = sk->sk_bound_dev_if;
660                 fl6.flowi6_mark = sk->sk_mark;
661                 fl6.fl6_dport = inet->inet_dport;
662                 fl6.fl6_sport = inet->inet_sport;
663                 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
664 
665                 final_p = fl6_update_dst(&fl6, np->opt, &final);
666 
667                 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
668                 if (IS_ERR(dst)) {
669                         sk->sk_route_caps = 0;
670                         sk->sk_err_soft = -PTR_ERR(dst);
671                         return PTR_ERR(dst);
672                 }
673 
674                 __ip6_dst_store(sk, dst, NULL, NULL);
675         }
676 
677         return 0;
678 }
679 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
680 
681 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb)
682 {
683         const struct ipv6_pinfo *np = inet6_sk(sk);
684         const struct inet6_skb_parm *opt = IP6CB(skb);
685 
686         if (np->rxopt.all) {
687                 if ((opt->hop && (np->rxopt.bits.hopopts ||
688                                   np->rxopt.bits.ohopopts)) ||
689                     ((IPV6_FLOWINFO_MASK &
690                       *(__be32 *)skb_network_header(skb)) &&
691                      np->rxopt.bits.rxflow) ||
692                     (opt->srcrt && (np->rxopt.bits.srcrt ||
693                      np->rxopt.bits.osrcrt)) ||
694                     ((opt->dst1 || opt->dst0) &&
695                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
696                         return true;
697         }
698         return false;
699 }
700 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
701 
702 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
703 {
704         const struct inet6_protocol *ops = NULL;
705 
706         for (;;) {
707                 struct ipv6_opt_hdr *opth;
708                 int len;
709 
710                 if (proto != NEXTHDR_HOP) {
711                         ops = rcu_dereference(inet6_protos[proto]);
712 
713                         if (unlikely(!ops))
714                                 break;
715 
716                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
717                                 break;
718                 }
719 
720                 if (unlikely(!pskb_may_pull(skb, 8)))
721                         break;
722 
723                 opth = (void *)skb->data;
724                 len = ipv6_optlen(opth);
725 
726                 if (unlikely(!pskb_may_pull(skb, len)))
727                         break;
728 
729                 proto = opth->nexthdr;
730                 __skb_pull(skb, len);
731         }
732 
733         return proto;
734 }
735 
736 static int ipv6_gso_send_check(struct sk_buff *skb)
737 {
738         const struct ipv6hdr *ipv6h;
739         const struct inet6_protocol *ops;
740         int err = -EINVAL;
741 
742         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
743                 goto out;
744 
745         ipv6h = ipv6_hdr(skb);
746         __skb_pull(skb, sizeof(*ipv6h));
747         err = -EPROTONOSUPPORT;
748 
749         rcu_read_lock();
750         ops = rcu_dereference(inet6_protos[
751                 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
752 
753         if (likely(ops && ops->gso_send_check)) {
754                 skb_reset_transport_header(skb);
755                 err = ops->gso_send_check(skb);
756         }
757         rcu_read_unlock();
758 
759 out:
760         return err;
761 }
762 
763 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
764         netdev_features_t features)
765 {
766         struct sk_buff *segs = ERR_PTR(-EINVAL);
767         struct ipv6hdr *ipv6h;
768         const struct inet6_protocol *ops;
769         int proto;
770         struct frag_hdr *fptr;
771         unsigned int unfrag_ip6hlen;
772         u8 *prevhdr;
773         int offset = 0;
774 
775         if (!(features & NETIF_F_V6_CSUM))
776                 features &= ~NETIF_F_SG;
777 
778         if (unlikely(skb_shinfo(skb)->gso_type &
779                      ~(SKB_GSO_UDP |
780                        SKB_GSO_DODGY |
781                        SKB_GSO_TCP_ECN |
782                        SKB_GSO_TCPV6 |
783                        0)))
784                 goto out;
785 
786         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
787                 goto out;
788 
789         ipv6h = ipv6_hdr(skb);
790         __skb_pull(skb, sizeof(*ipv6h));
791         segs = ERR_PTR(-EPROTONOSUPPORT);
792 
793         proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
794         rcu_read_lock();
795         ops = rcu_dereference(inet6_protos[proto]);
796         if (likely(ops && ops->gso_segment)) {
797                 skb_reset_transport_header(skb);
798                 segs = ops->gso_segment(skb, features);
799         }
800         rcu_read_unlock();
801 
802         if (IS_ERR(segs))
803                 goto out;
804 
805         for (skb = segs; skb; skb = skb->next) {
806                 ipv6h = ipv6_hdr(skb);
807                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
808                                            sizeof(*ipv6h));
809                 if (proto == IPPROTO_UDP) {
810                         unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
811                         fptr = (struct frag_hdr *)(skb_network_header(skb) +
812                                 unfrag_ip6hlen);
813                         fptr->frag_off = htons(offset);
814                         if (skb->next != NULL)
815                                 fptr->frag_off |= htons(IP6_MF);
816                         offset += (ntohs(ipv6h->payload_len) -
817                                    sizeof(struct frag_hdr));
818                 }
819         }
820 
821 out:
822         return segs;
823 }
824 
825 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
826                                          struct sk_buff *skb)
827 {
828         const struct inet6_protocol *ops;
829         struct sk_buff **pp = NULL;
830         struct sk_buff *p;
831         struct ipv6hdr *iph;
832         unsigned int nlen;
833         unsigned int hlen;
834         unsigned int off;
835         int flush = 1;
836         int proto;
837         __wsum csum;
838 
839         off = skb_gro_offset(skb);
840         hlen = off + sizeof(*iph);
841         iph = skb_gro_header_fast(skb, off);
842         if (skb_gro_header_hard(skb, hlen)) {
843                 iph = skb_gro_header_slow(skb, hlen, off);
844                 if (unlikely(!iph))
845                         goto out;
846         }
847 
848         skb_gro_pull(skb, sizeof(*iph));
849         skb_set_transport_header(skb, skb_gro_offset(skb));
850 
851         flush += ntohs(iph->payload_len) != skb_gro_len(skb);
852 
853         rcu_read_lock();
854         proto = iph->nexthdr;
855         ops = rcu_dereference(inet6_protos[proto]);
856         if (!ops || !ops->gro_receive) {
857                 __pskb_pull(skb, skb_gro_offset(skb));
858                 proto = ipv6_gso_pull_exthdrs(skb, proto);
859                 skb_gro_pull(skb, -skb_transport_offset(skb));
860                 skb_reset_transport_header(skb);
861                 __skb_push(skb, skb_gro_offset(skb));
862 
863                 ops = rcu_dereference(inet6_protos[proto]);
864                 if (!ops || !ops->gro_receive)
865                         goto out_unlock;
866 
867                 iph = ipv6_hdr(skb);
868         }
869 
870         NAPI_GRO_CB(skb)->proto = proto;
871 
872         flush--;
873         nlen = skb_network_header_len(skb);
874 
875         for (p = *head; p; p = p->next) {
876                 const struct ipv6hdr *iph2;
877                 __be32 first_word; /* <Version:4><Traffic_Class:8><Flow_Label:20> */
878 
879                 if (!NAPI_GRO_CB(p)->same_flow)
880                         continue;
881 
882                 iph2 = ipv6_hdr(p);
883                 first_word = *(__be32 *)iph ^ *(__be32 *)iph2 ;
884 
885                 /* All fields must match except length and Traffic Class. */
886                 if (nlen != skb_network_header_len(p) ||
887                     (first_word & htonl(0xF00FFFFF)) ||
888                     memcmp(&iph->nexthdr, &iph2->nexthdr,
889                            nlen - offsetof(struct ipv6hdr, nexthdr))) {
890                         NAPI_GRO_CB(p)->same_flow = 0;
891                         continue;
892                 }
893                 /* flush if Traffic Class fields are different */
894                 NAPI_GRO_CB(p)->flush |= !!(first_word & htonl(0x0FF00000));
895                 NAPI_GRO_CB(p)->flush |= flush;
896         }
897 
898         NAPI_GRO_CB(skb)->flush |= flush;
899 
900         csum = skb->csum;
901         skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
902 
903         pp = ops->gro_receive(head, skb);
904 
905         skb->csum = csum;
906 
907 out_unlock:
908         rcu_read_unlock();
909 
910 out:
911         NAPI_GRO_CB(skb)->flush |= flush;
912 
913         return pp;
914 }
915 
916 static int ipv6_gro_complete(struct sk_buff *skb)
917 {
918         const struct inet6_protocol *ops;
919         struct ipv6hdr *iph = ipv6_hdr(skb);
920         int err = -ENOSYS;
921 
922         iph->payload_len = htons(skb->len - skb_network_offset(skb) -
923                                  sizeof(*iph));
924 
925         rcu_read_lock();
926         ops = rcu_dereference(inet6_protos[NAPI_GRO_CB(skb)->proto]);
927         if (WARN_ON(!ops || !ops->gro_complete))
928                 goto out_unlock;
929 
930         err = ops->gro_complete(skb);
931 
932 out_unlock:
933         rcu_read_unlock();
934 
935         return err;
936 }
937 
938 static struct packet_type ipv6_packet_type __read_mostly = {
939         .type = cpu_to_be16(ETH_P_IPV6),
940         .func = ipv6_rcv,
941         .gso_send_check = ipv6_gso_send_check,
942         .gso_segment = ipv6_gso_segment,
943         .gro_receive = ipv6_gro_receive,
944         .gro_complete = ipv6_gro_complete,
945 };
946 
947 static int __init ipv6_packet_init(void)
948 {
949         dev_add_pack(&ipv6_packet_type);
950         return 0;
951 }
952 
953 static void ipv6_packet_cleanup(void)
954 {
955         dev_remove_pack(&ipv6_packet_type);
956 }
957 
958 static int __net_init ipv6_init_mibs(struct net *net)
959 {
960         if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
961                           sizeof(struct udp_mib),
962                           __alignof__(struct udp_mib)) < 0)
963                 return -ENOMEM;
964         if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
965                           sizeof(struct udp_mib),
966                           __alignof__(struct udp_mib)) < 0)
967                 goto err_udplite_mib;
968         if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
969                           sizeof(struct ipstats_mib),
970                           __alignof__(struct ipstats_mib)) < 0)
971                 goto err_ip_mib;
972         if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
973                           sizeof(struct icmpv6_mib),
974                           __alignof__(struct icmpv6_mib)) < 0)
975                 goto err_icmp_mib;
976         net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
977                                                 GFP_KERNEL);
978         if (!net->mib.icmpv6msg_statistics)
979                 goto err_icmpmsg_mib;
980         return 0;
981 
982 err_icmpmsg_mib:
983         snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
984 err_icmp_mib:
985         snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
986 err_ip_mib:
987         snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
988 err_udplite_mib:
989         snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
990         return -ENOMEM;
991 }
992 
993 static void ipv6_cleanup_mibs(struct net *net)
994 {
995         snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
996         snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
997         snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
998         snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
999         kfree(net->mib.icmpv6msg_statistics);
1000 }
1001 
1002 static int __net_init inet6_net_init(struct net *net)
1003 {
1004         int err = 0;
1005 
1006         net->ipv6.sysctl.bindv6only = 0;
1007         net->ipv6.sysctl.icmpv6_time = 1*HZ;
1008 
1009         err = ipv6_init_mibs(net);
1010         if (err)
1011                 return err;
1012 #ifdef CONFIG_PROC_FS
1013         err = udp6_proc_init(net);
1014         if (err)
1015                 goto out;
1016         err = tcp6_proc_init(net);
1017         if (err)
1018                 goto proc_tcp6_fail;
1019         err = ac6_proc_init(net);
1020         if (err)
1021                 goto proc_ac6_fail;
1022 #endif
1023         return err;
1024 
1025 #ifdef CONFIG_PROC_FS
1026 proc_ac6_fail:
1027         tcp6_proc_exit(net);
1028 proc_tcp6_fail:
1029         udp6_proc_exit(net);
1030 out:
1031         ipv6_cleanup_mibs(net);
1032         return err;
1033 #endif
1034 }
1035 
1036 static void __net_exit inet6_net_exit(struct net *net)
1037 {
1038 #ifdef CONFIG_PROC_FS
1039         udp6_proc_exit(net);
1040         tcp6_proc_exit(net);
1041         ac6_proc_exit(net);
1042 #endif
1043         ipv6_cleanup_mibs(net);
1044 }
1045 
1046 static struct pernet_operations inet6_net_ops = {
1047         .init = inet6_net_init,
1048         .exit = inet6_net_exit,
1049 };
1050 
1051 static int __init inet6_init(void)
1052 {
1053         struct sk_buff *dummy_skb;
1054         struct list_head *r;
1055         int err = 0;
1056 
1057         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1058 
1059         /* Register the socket-side information for inet6_create.  */
1060         for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1061                 INIT_LIST_HEAD(r);
1062 
1063         if (disable_ipv6_mod) {
1064                 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1065                 goto out;
1066         }
1067 
1068         err = proto_register(&tcpv6_prot, 1);
1069         if (err)
1070                 goto out;
1071 
1072         err = proto_register(&udpv6_prot, 1);
1073         if (err)
1074                 goto out_unregister_tcp_proto;
1075 
1076         err = proto_register(&udplitev6_prot, 1);
1077         if (err)
1078                 goto out_unregister_udp_proto;
1079 
1080         err = proto_register(&rawv6_prot, 1);
1081         if (err)
1082                 goto out_unregister_udplite_proto;
1083 
1084 
1085         /* We MUST register RAW sockets before we create the ICMP6,
1086          * IGMP6, or NDISC control sockets.
1087          */
1088         err = rawv6_init();
1089         if (err)
1090                 goto out_unregister_raw_proto;
1091 
1092         /* Register the family here so that the init calls below will
1093          * be able to create sockets. (?? is this dangerous ??)
1094          */
1095         err = sock_register(&inet6_family_ops);
1096         if (err)
1097                 goto out_sock_register_fail;
1098 
1099         tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;
1100 
1101         /*
1102          *      ipngwg API draft makes clear that the correct semantics
1103          *      for TCP and UDP is to consider one TCP and UDP instance
1104          *      in a host available by both INET and INET6 APIs and
1105          *      able to communicate via both network protocols.
1106          */
1107 
1108         err = register_pernet_subsys(&inet6_net_ops);
1109         if (err)
1110                 goto register_pernet_fail;
1111         err = icmpv6_init();
1112         if (err)
1113                 goto icmp_fail;
1114         err = ip6_mr_init();
1115         if (err)
1116                 goto ipmr_fail;
1117         err = ndisc_init();
1118         if (err)
1119                 goto ndisc_fail;
1120         err = igmp6_init();
1121         if (err)
1122                 goto igmp_fail;
1123         err = ipv6_netfilter_init();
1124         if (err)
1125                 goto netfilter_fail;
1126         /* Create /proc/foo6 entries. */
1127 #ifdef CONFIG_PROC_FS
1128         err = -ENOMEM;
1129         if (raw6_proc_init())
1130                 goto proc_raw6_fail;
1131         if (udplite6_proc_init())
1132                 goto proc_udplite6_fail;
1133         if (ipv6_misc_proc_init())
1134                 goto proc_misc6_fail;
1135         if (if6_proc_init())
1136                 goto proc_if6_fail;
1137 #endif
1138         err = ip6_route_init();
1139         if (err)
1140                 goto ip6_route_fail;
1141         err = ip6_flowlabel_init();
1142         if (err)
1143                 goto ip6_flowlabel_fail;
1144         err = addrconf_init();
1145         if (err)
1146                 goto addrconf_fail;
1147 
1148         /* Init v6 extension headers. */
1149         err = ipv6_exthdrs_init();
1150         if (err)
1151                 goto ipv6_exthdrs_fail;
1152 
1153         err = ipv6_frag_init();
1154         if (err)
1155                 goto ipv6_frag_fail;
1156 
1157         /* Init v6 transport protocols. */
1158         err = udpv6_init();
1159         if (err)
1160                 goto udpv6_fail;
1161 
1162         err = udplitev6_init();
1163         if (err)
1164                 goto udplitev6_fail;
1165 
1166         err = tcpv6_init();
1167         if (err)
1168                 goto tcpv6_fail;
1169 
1170         err = ipv6_packet_init();
1171         if (err)
1172                 goto ipv6_packet_fail;
1173 
1174 #ifdef CONFIG_SYSCTL
1175         err = ipv6_sysctl_register();
1176         if (err)
1177                 goto sysctl_fail;
1178 #endif
1179 out:
1180         return err;
1181 
1182 #ifdef CONFIG_SYSCTL
1183 sysctl_fail:
1184         ipv6_packet_cleanup();
1185 #endif
1186 ipv6_packet_fail:
1187         tcpv6_exit();
1188 tcpv6_fail:
1189         udplitev6_exit();
1190 udplitev6_fail:
1191         udpv6_exit();
1192 udpv6_fail:
1193         ipv6_frag_exit();
1194 ipv6_frag_fail:
1195         ipv6_exthdrs_exit();
1196 ipv6_exthdrs_fail:
1197         addrconf_cleanup();
1198 addrconf_fail:
1199         ip6_flowlabel_cleanup();
1200 ip6_flowlabel_fail:
1201         ip6_route_cleanup();
1202 ip6_route_fail:
1203 #ifdef CONFIG_PROC_FS
1204         if6_proc_exit();
1205 proc_if6_fail:
1206         ipv6_misc_proc_exit();
1207 proc_misc6_fail:
1208         udplite6_proc_exit();
1209 proc_udplite6_fail:
1210         raw6_proc_exit();
1211 proc_raw6_fail:
1212 #endif
1213         ipv6_netfilter_fini();
1214 netfilter_fail:
1215         igmp6_cleanup();
1216 igmp_fail:
1217         ndisc_cleanup();
1218 ndisc_fail:
1219         ip6_mr_cleanup();
1220 ipmr_fail:
1221         icmpv6_cleanup();
1222 icmp_fail:
1223         unregister_pernet_subsys(&inet6_net_ops);
1224 register_pernet_fail:
1225         sock_unregister(PF_INET6);
1226         rtnl_unregister_all(PF_INET6);
1227 out_sock_register_fail:
1228         rawv6_exit();
1229 out_unregister_raw_proto:
1230         proto_unregister(&rawv6_prot);
1231 out_unregister_udplite_proto:
1232         proto_unregister(&udplitev6_prot);
1233 out_unregister_udp_proto:
1234         proto_unregister(&udpv6_prot);
1235 out_unregister_tcp_proto:
1236         proto_unregister(&tcpv6_prot);
1237         goto out;
1238 }
1239 module_init(inet6_init);
1240 
1241 static void __exit inet6_exit(void)
1242 {
1243         if (disable_ipv6_mod)
1244                 return;
1245 
1246         /* First of all disallow new sockets creation. */
1247         sock_unregister(PF_INET6);
1248         /* Disallow any further netlink messages */
1249         rtnl_unregister_all(PF_INET6);
1250 
1251         udpv6_exit();
1252         udplitev6_exit();
1253         tcpv6_exit();
1254 
1255         /* Cleanup code parts. */
1256         ipv6_packet_cleanup();
1257         ipv6_frag_exit();
1258         ipv6_exthdrs_exit();
1259         addrconf_cleanup();
1260         ip6_flowlabel_cleanup();
1261         ip6_route_cleanup();
1262 #ifdef CONFIG_PROC_FS
1263 
1264         /* Cleanup code parts. */
1265         if6_proc_exit();
1266         ipv6_misc_proc_exit();
1267         udplite6_proc_exit();
1268         raw6_proc_exit();
1269 #endif
1270         ipv6_netfilter_fini();
1271         igmp6_cleanup();
1272         ndisc_cleanup();
1273         ip6_mr_cleanup();
1274         icmpv6_cleanup();
1275         rawv6_exit();
1276 
1277         unregister_pernet_subsys(&inet6_net_ops);
1278         proto_unregister(&rawv6_prot);
1279         proto_unregister(&udplitev6_prot);
1280         proto_unregister(&udpv6_prot);
1281         proto_unregister(&tcpv6_prot);
1282 
1283         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1284 }
1285 module_exit(inet6_exit);
1286 
1287 MODULE_ALIAS_NETPROTO(PF_INET6);
1288 

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