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usb: dwc3: pci: Enable extcon driver for Intel Merrifield
[linux/fpc-iii.git] / net / ipv6 / af_inet6.c
blob5c2351deedc8f4de7cc2f1632dcc5c4c8f52e9e8
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/ping.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 #include <net/ndisc.h>
60 #ifdef CONFIG_IPV6_TUNNEL
61 #include <net/ip6_tunnel.h>
62 #endif
63 #include <net/calipso.h>
64 #include <net/seg6.h>
65
66 #include <linux/uaccess.h>
67 #include <linux/mroute6.h>
68
69 #include "ip6_offload.h"
70
71 MODULE_AUTHOR("Cast of dozens");
72 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
73 MODULE_LICENSE("GPL");
74
75 /* The inetsw6 table contains everything that inet6_create needs to
76 * build a new socket.
77 */
78 static struct list_head inetsw6[SOCK_MAX];
79 static DEFINE_SPINLOCK(inetsw6_lock);
80
81 struct ipv6_params ipv6_defaults = {
82 .disable_ipv6 = 0,
83 .autoconf = 1,
84 };
85
86 static int disable_ipv6_mod;
87
88 module_param_named(disable, disable_ipv6_mod, int, 0444);
89 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
90
91 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
92 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
93
94 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
95 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
96
97 bool ipv6_mod_enabled(void)
98 {
99 return disable_ipv6_mod == 0;
100 }
101 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
102
103 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
104 {
105 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
106
107 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
108 }
109
110 static int inet6_create(struct net *net, struct socket *sock, int protocol,
111 int kern)
112 {
113 struct inet_sock *inet;
114 struct ipv6_pinfo *np;
115 struct sock *sk;
116 struct inet_protosw *answer;
117 struct proto *answer_prot;
118 unsigned char answer_flags;
119 int try_loading_module = 0;
120 int err;
121
122 if (protocol < 0 || protocol >= IPPROTO_MAX)
123 return -EINVAL;
124
125 /* Look for the requested type/protocol pair. */
126 lookup_protocol:
127 err = -ESOCKTNOSUPPORT;
128 rcu_read_lock();
129 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
130
131 err = 0;
132 /* Check the non-wild match. */
133 if (protocol == answer->protocol) {
134 if (protocol != IPPROTO_IP)
135 break;
136 } else {
137 /* Check for the two wild cases. */
138 if (IPPROTO_IP == protocol) {
139 protocol = answer->protocol;
140 break;
141 }
142 if (IPPROTO_IP == answer->protocol)
143 break;
144 }
145 err = -EPROTONOSUPPORT;
146 }
147
148 if (err) {
149 if (try_loading_module < 2) {
150 rcu_read_unlock();
151 /*
152 * Be more specific, e.g. net-pf-10-proto-132-type-1
153 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
154 */
155 if (++try_loading_module == 1)
156 request_module("net-pf-%d-proto-%d-type-%d",
157 PF_INET6, protocol, sock->type);
158 /*
159 * Fall back to generic, e.g. net-pf-10-proto-132
160 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
161 */
162 else
163 request_module("net-pf-%d-proto-%d",
164 PF_INET6, protocol);
165 goto lookup_protocol;
166 } else
167 goto out_rcu_unlock;
168 }
169
170 err = -EPERM;
171 if (sock->type == SOCK_RAW && !kern &&
172 !ns_capable(net->user_ns, CAP_NET_RAW))
173 goto out_rcu_unlock;
174
175 sock->ops = answer->ops;
176 answer_prot = answer->prot;
177 answer_flags = answer->flags;
178 rcu_read_unlock();
179
180 WARN_ON(!answer_prot->slab);
181
182 err = -ENOBUFS;
183 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
184 if (!sk)
185 goto out;
186
187 sock_init_data(sock, sk);
188
189 err = 0;
190 if (INET_PROTOSW_REUSE & answer_flags)
191 sk->sk_reuse = SK_CAN_REUSE;
192
193 inet = inet_sk(sk);
194 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
195
196 if (SOCK_RAW == sock->type) {
197 inet->inet_num = protocol;
198 if (IPPROTO_RAW == protocol)
199 inet->hdrincl = 1;
200 }
201
202 sk->sk_destruct = inet_sock_destruct;
203 sk->sk_family = PF_INET6;
204 sk->sk_protocol = protocol;
205
206 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
207
208 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
209 np->hop_limit = -1;
210 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
211 np->mc_loop = 1;
212 np->pmtudisc = IPV6_PMTUDISC_WANT;
213 np->repflow = net->ipv6.sysctl.flowlabel_reflect;
214 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
215
216 /* Init the ipv4 part of the socket since we can have sockets
217 * using v6 API for ipv4.
218 */
219 inet->uc_ttl = -1;
220
221 inet->mc_loop = 1;
222 inet->mc_ttl = 1;
223 inet->mc_index = 0;
224 inet->mc_list = NULL;
225 inet->rcv_tos = 0;
226
227 if (net->ipv4.sysctl_ip_no_pmtu_disc)
228 inet->pmtudisc = IP_PMTUDISC_DONT;
229 else
230 inet->pmtudisc = IP_PMTUDISC_WANT;
231 /*
232 * Increment only the relevant sk_prot->socks debug field, this changes
233 * the previous behaviour of incrementing both the equivalent to
234 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
235 *
236 * This allows better debug granularity as we'll know exactly how many
237 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
238 * transport protocol socks. -acme
239 */
240 sk_refcnt_debug_inc(sk);
241
242 if (inet->inet_num) {
243 /* It assumes that any protocol which allows
244 * the user to assign a number at socket
245 * creation time automatically shares.
246 */
247 inet->inet_sport = htons(inet->inet_num);
248 err = sk->sk_prot->hash(sk);
249 if (err) {
250 sk_common_release(sk);
251 goto out;
252 }
253 }
254 if (sk->sk_prot->init) {
255 err = sk->sk_prot->init(sk);
256 if (err) {
257 sk_common_release(sk);
258 goto out;
259 }
260 }
261
262 if (!kern) {
263 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
264 if (err) {
265 sk_common_release(sk);
266 goto out;
267 }
268 }
269 out:
270 return err;
271 out_rcu_unlock:
272 rcu_read_unlock();
273 goto out;
274 }
275
276 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
277 bool force_bind_address_no_port, bool with_lock)
278 {
279 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
280 struct inet_sock *inet = inet_sk(sk);
281 struct ipv6_pinfo *np = inet6_sk(sk);
282 struct net *net = sock_net(sk);
283 __be32 v4addr = 0;
284 unsigned short snum;
285 bool saved_ipv6only;
286 int addr_type = 0;
287 int err = 0;
288
289 if (addr->sin6_family != AF_INET6)
290 return -EAFNOSUPPORT;
291
292 addr_type = ipv6_addr_type(&addr->sin6_addr);
293 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
294 return -EINVAL;
295
296 snum = ntohs(addr->sin6_port);
297 if (snum && snum < inet_prot_sock(net) &&
298 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
299 return -EACCES;
300
301 if (with_lock)
302 lock_sock(sk);
303
304 /* Check these errors (active socket, double bind). */
305 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
306 err = -EINVAL;
307 goto out;
308 }
309
310 /* Check if the address belongs to the host. */
311 if (addr_type == IPV6_ADDR_MAPPED) {
312 struct net_device *dev = NULL;
313 int chk_addr_ret;
314
315 /* Binding to v4-mapped address on a v6-only socket
316 * makes no sense
317 */
318 if (sk->sk_ipv6only) {
319 err = -EINVAL;
320 goto out;
321 }
322
323 rcu_read_lock();
324 if (sk->sk_bound_dev_if) {
325 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
326 if (!dev) {
327 err = -ENODEV;
328 goto out_unlock;
329 }
330 }
331
332 /* Reproduce AF_INET checks to make the bindings consistent */
333 v4addr = addr->sin6_addr.s6_addr32[3];
334 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
335 rcu_read_unlock();
336
337 if (!inet_can_nonlocal_bind(net, inet) &&
338 v4addr != htonl(INADDR_ANY) &&
339 chk_addr_ret != RTN_LOCAL &&
340 chk_addr_ret != RTN_MULTICAST &&
341 chk_addr_ret != RTN_BROADCAST) {
342 err = -EADDRNOTAVAIL;
343 goto out;
344 }
345 } else {
346 if (addr_type != IPV6_ADDR_ANY) {
347 struct net_device *dev = NULL;
348
349 rcu_read_lock();
350 if (__ipv6_addr_needs_scope_id(addr_type)) {
351 if (addr_len >= sizeof(struct sockaddr_in6) &&
352 addr->sin6_scope_id) {
353 /* Override any existing binding, if another one
354 * is supplied by user.
355 */
356 sk->sk_bound_dev_if = addr->sin6_scope_id;
357 }
358
359 /* Binding to link-local address requires an interface */
360 if (!sk->sk_bound_dev_if) {
361 err = -EINVAL;
362 goto out_unlock;
363 }
364 }
365
366 if (sk->sk_bound_dev_if) {
367 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
368 if (!dev) {
369 err = -ENODEV;
370 goto out_unlock;
371 }
372 }
373
374 /* ipv4 addr of the socket is invalid. Only the
375 * unspecified and mapped address have a v4 equivalent.
376 */
377 v4addr = LOOPBACK4_IPV6;
378 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
379 if (!ipv6_can_nonlocal_bind(net, inet) &&
380 !ipv6_chk_addr(net, &addr->sin6_addr,
381 dev, 0)) {
382 err = -EADDRNOTAVAIL;
383 goto out_unlock;
384 }
385 }
386 rcu_read_unlock();
387 }
388 }
389
390 inet->inet_rcv_saddr = v4addr;
391 inet->inet_saddr = v4addr;
392
393 sk->sk_v6_rcv_saddr = addr->sin6_addr;
394
395 if (!(addr_type & IPV6_ADDR_MULTICAST))
396 np->saddr = addr->sin6_addr;
397
398 saved_ipv6only = sk->sk_ipv6only;
399 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
400 sk->sk_ipv6only = 1;
401
402 /* Make sure we are allowed to bind here. */
403 if (snum || !(inet->bind_address_no_port ||
404 force_bind_address_no_port)) {
405 if (sk->sk_prot->get_port(sk, snum)) {
406 sk->sk_ipv6only = saved_ipv6only;
407 inet_reset_saddr(sk);
408 err = -EADDRINUSE;
409 goto out;
410 }
411 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
412 if (err) {
413 sk->sk_ipv6only = saved_ipv6only;
414 inet_reset_saddr(sk);
415 goto out;
416 }
417 }
418
419 if (addr_type != IPV6_ADDR_ANY)
420 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
421 if (snum)
422 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
423 inet->inet_sport = htons(inet->inet_num);
424 inet->inet_dport = 0;
425 inet->inet_daddr = 0;
426 out:
427 if (with_lock)
428 release_sock(sk);
429 return err;
430 out_unlock:
431 rcu_read_unlock();
432 goto out;
433 }
434
435 /* bind for INET6 API */
436 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
437 {
438 struct sock *sk = sock->sk;
439 int err = 0;
440
441 /* If the socket has its own bind function then use it. */
442 if (sk->sk_prot->bind)
443 return sk->sk_prot->bind(sk, uaddr, addr_len);
444
445 if (addr_len < SIN6_LEN_RFC2133)
446 return -EINVAL;
447
448 /* BPF prog is run before any checks are done so that if the prog
449 * changes context in a wrong way it will be caught.
450 */
451 err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr);
452 if (err)
453 return err;
454
455 return __inet6_bind(sk, uaddr, addr_len, false, true);
456 }
457 EXPORT_SYMBOL(inet6_bind);
458
459 int inet6_release(struct socket *sock)
460 {
461 struct sock *sk = sock->sk;
462
463 if (!sk)
464 return -EINVAL;
465
466 /* Free mc lists */
467 ipv6_sock_mc_close(sk);
468
469 /* Free ac lists */
470 ipv6_sock_ac_close(sk);
471
472 return inet_release(sock);
473 }
474 EXPORT_SYMBOL(inet6_release);
475
476 void inet6_destroy_sock(struct sock *sk)
477 {
478 struct ipv6_pinfo *np = inet6_sk(sk);
479 struct sk_buff *skb;
480 struct ipv6_txoptions *opt;
481
482 /* Release rx options */
483
484 skb = xchg(&np->pktoptions, NULL);
485 if (skb)
486 kfree_skb(skb);
487
488 skb = xchg(&np->rxpmtu, NULL);
489 if (skb)
490 kfree_skb(skb);
491
492 /* Free flowlabels */
493 fl6_free_socklist(sk);
494
495 /* Free tx options */
496
497 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
498 if (opt) {
499 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
500 txopt_put(opt);
501 }
502 }
503 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
504
505 /*
506 * This does both peername and sockname.
507 */
508
509 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
510 int peer)
511 {
512 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
513 struct sock *sk = sock->sk;
514 struct inet_sock *inet = inet_sk(sk);
515 struct ipv6_pinfo *np = inet6_sk(sk);
516
517 sin->sin6_family = AF_INET6;
518 sin->sin6_flowinfo = 0;
519 sin->sin6_scope_id = 0;
520 if (peer) {
521 if (!inet->inet_dport)
522 return -ENOTCONN;
523 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
524 peer == 1)
525 return -ENOTCONN;
526 sin->sin6_port = inet->inet_dport;
527 sin->sin6_addr = sk->sk_v6_daddr;
528 if (np->sndflow)
529 sin->sin6_flowinfo = np->flow_label;
530 } else {
531 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
532 sin->sin6_addr = np->saddr;
533 else
534 sin->sin6_addr = sk->sk_v6_rcv_saddr;
535
536 sin->sin6_port = inet->inet_sport;
537 }
538 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
539 sk->sk_bound_dev_if);
540 return sizeof(*sin);
541 }
542 EXPORT_SYMBOL(inet6_getname);
543
544 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
545 {
546 struct sock *sk = sock->sk;
547 struct net *net = sock_net(sk);
548
549 switch (cmd) {
550 case SIOCGSTAMP:
551 return sock_get_timestamp(sk, (struct timeval __user *)arg);
552
553 case SIOCGSTAMPNS:
554 return sock_get_timestampns(sk, (struct timespec __user *)arg);
555
556 case SIOCADDRT:
557 case SIOCDELRT:
558
559 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
560
561 case SIOCSIFADDR:
562 return addrconf_add_ifaddr(net, (void __user *) arg);
563 case SIOCDIFADDR:
564 return addrconf_del_ifaddr(net, (void __user *) arg);
565 case SIOCSIFDSTADDR:
566 return addrconf_set_dstaddr(net, (void __user *) arg);
567 default:
568 if (!sk->sk_prot->ioctl)
569 return -ENOIOCTLCMD;
570 return sk->sk_prot->ioctl(sk, cmd, arg);
571 }
572 /*NOTREACHED*/
573 return 0;
574 }
575 EXPORT_SYMBOL(inet6_ioctl);
576
577 const struct proto_ops inet6_stream_ops = {
578 .family = PF_INET6,
579 .owner = THIS_MODULE,
580 .release = inet6_release,
581 .bind = inet6_bind,
582 .connect = inet_stream_connect, /* ok */
583 .socketpair = sock_no_socketpair, /* a do nothing */
584 .accept = inet_accept, /* ok */
585 .getname = inet6_getname,
586 .poll = tcp_poll, /* ok */
587 .ioctl = inet6_ioctl, /* must change */
588 .listen = inet_listen, /* ok */
589 .shutdown = inet_shutdown, /* ok */
590 .setsockopt = sock_common_setsockopt, /* ok */
591 .getsockopt = sock_common_getsockopt, /* ok */
592 .sendmsg = inet_sendmsg, /* ok */
593 .recvmsg = inet_recvmsg, /* ok */
594 #ifdef CONFIG_MMU
595 .mmap = tcp_mmap,
596 #endif
597 .sendpage = inet_sendpage,
598 .sendmsg_locked = tcp_sendmsg_locked,
599 .sendpage_locked = tcp_sendpage_locked,
600 .splice_read = tcp_splice_read,
601 .read_sock = tcp_read_sock,
602 .peek_len = tcp_peek_len,
603 #ifdef CONFIG_COMPAT
604 .compat_setsockopt = compat_sock_common_setsockopt,
605 .compat_getsockopt = compat_sock_common_getsockopt,
606 #endif
607 .set_rcvlowat = tcp_set_rcvlowat,
608 };
609
610 const struct proto_ops inet6_dgram_ops = {
611 .family = PF_INET6,
612 .owner = THIS_MODULE,
613 .release = inet6_release,
614 .bind = inet6_bind,
615 .connect = inet_dgram_connect, /* ok */
616 .socketpair = sock_no_socketpair, /* a do nothing */
617 .accept = sock_no_accept, /* a do nothing */
618 .getname = inet6_getname,
619 .poll = udp_poll, /* ok */
620 .ioctl = inet6_ioctl, /* must change */
621 .listen = sock_no_listen, /* ok */
622 .shutdown = inet_shutdown, /* ok */
623 .setsockopt = sock_common_setsockopt, /* ok */
624 .getsockopt = sock_common_getsockopt, /* ok */
625 .sendmsg = inet_sendmsg, /* ok */
626 .recvmsg = inet_recvmsg, /* ok */
627 .mmap = sock_no_mmap,
628 .sendpage = sock_no_sendpage,
629 .set_peek_off = sk_set_peek_off,
630 #ifdef CONFIG_COMPAT
631 .compat_setsockopt = compat_sock_common_setsockopt,
632 .compat_getsockopt = compat_sock_common_getsockopt,
633 #endif
634 };
635
636 static const struct net_proto_family inet6_family_ops = {
637 .family = PF_INET6,
638 .create = inet6_create,
639 .owner = THIS_MODULE,
640 };
641
642 int inet6_register_protosw(struct inet_protosw *p)
643 {
644 struct list_head *lh;
645 struct inet_protosw *answer;
646 struct list_head *last_perm;
647 int protocol = p->protocol;
648 int ret;
649
650 spin_lock_bh(&inetsw6_lock);
651
652 ret = -EINVAL;
653 if (p->type >= SOCK_MAX)
654 goto out_illegal;
655
656 /* If we are trying to override a permanent protocol, bail. */
657 answer = NULL;
658 ret = -EPERM;
659 last_perm = &inetsw6[p->type];
660 list_for_each(lh, &inetsw6[p->type]) {
661 answer = list_entry(lh, struct inet_protosw, list);
662
663 /* Check only the non-wild match. */
664 if (INET_PROTOSW_PERMANENT & answer->flags) {
665 if (protocol == answer->protocol)
666 break;
667 last_perm = lh;
668 }
669
670 answer = NULL;
671 }
672 if (answer)
673 goto out_permanent;
674
675 /* Add the new entry after the last permanent entry if any, so that
676 * the new entry does not override a permanent entry when matched with
677 * a wild-card protocol. But it is allowed to override any existing
678 * non-permanent entry. This means that when we remove this entry, the
679 * system automatically returns to the old behavior.
680 */
681 list_add_rcu(&p->list, last_perm);
682 ret = 0;
683 out:
684 spin_unlock_bh(&inetsw6_lock);
685 return ret;
686
687 out_permanent:
688 pr_err("Attempt to override permanent protocol %d\n", protocol);
689 goto out;
690
691 out_illegal:
692 pr_err("Ignoring attempt to register invalid socket type %d\n",
693 p->type);
694 goto out;
695 }
696 EXPORT_SYMBOL(inet6_register_protosw);
697
698 void
699 inet6_unregister_protosw(struct inet_protosw *p)
700 {
701 if (INET_PROTOSW_PERMANENT & p->flags) {
702 pr_err("Attempt to unregister permanent protocol %d\n",
703 p->protocol);
704 } else {
705 spin_lock_bh(&inetsw6_lock);
706 list_del_rcu(&p->list);
707 spin_unlock_bh(&inetsw6_lock);
708
709 synchronize_net();
710 }
711 }
712 EXPORT_SYMBOL(inet6_unregister_protosw);
713
714 int inet6_sk_rebuild_header(struct sock *sk)
715 {
716 struct ipv6_pinfo *np = inet6_sk(sk);
717 struct dst_entry *dst;
718
719 dst = __sk_dst_check(sk, np->dst_cookie);
720
721 if (!dst) {
722 struct inet_sock *inet = inet_sk(sk);
723 struct in6_addr *final_p, final;
724 struct flowi6 fl6;
725
726 memset(&fl6, 0, sizeof(fl6));
727 fl6.flowi6_proto = sk->sk_protocol;
728 fl6.daddr = sk->sk_v6_daddr;
729 fl6.saddr = np->saddr;
730 fl6.flowlabel = np->flow_label;
731 fl6.flowi6_oif = sk->sk_bound_dev_if;
732 fl6.flowi6_mark = sk->sk_mark;
733 fl6.fl6_dport = inet->inet_dport;
734 fl6.fl6_sport = inet->inet_sport;
735 fl6.flowi6_uid = sk->sk_uid;
736 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
737
738 rcu_read_lock();
739 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
740 &final);
741 rcu_read_unlock();
742
743 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
744 if (IS_ERR(dst)) {
745 sk->sk_route_caps = 0;
746 sk->sk_err_soft = -PTR_ERR(dst);
747 return PTR_ERR(dst);
748 }
749
750 ip6_dst_store(sk, dst, NULL, NULL);
751 }
752
753 return 0;
754 }
755 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
756
757 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
758 const struct inet6_skb_parm *opt)
759 {
760 const struct ipv6_pinfo *np = inet6_sk(sk);
761
762 if (np->rxopt.all) {
763 if (((opt->flags & IP6SKB_HOPBYHOP) &&
764 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
765 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
766 np->rxopt.bits.rxflow) ||
767 (opt->srcrt && (np->rxopt.bits.srcrt ||
768 np->rxopt.bits.osrcrt)) ||
769 ((opt->dst1 || opt->dst0) &&
770 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
771 return true;
772 }
773 return false;
774 }
775 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
776
777 static struct packet_type ipv6_packet_type __read_mostly = {
778 .type = cpu_to_be16(ETH_P_IPV6),
779 .func = ipv6_rcv,
780 .list_func = ipv6_list_rcv,
781 };
782
783 static int __init ipv6_packet_init(void)
784 {
785 dev_add_pack(&ipv6_packet_type);
786 return 0;
787 }
788
789 static void ipv6_packet_cleanup(void)
790 {
791 dev_remove_pack(&ipv6_packet_type);
792 }
793
794 static int __net_init ipv6_init_mibs(struct net *net)
795 {
796 int i;
797
798 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
799 if (!net->mib.udp_stats_in6)
800 return -ENOMEM;
801 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
802 if (!net->mib.udplite_stats_in6)
803 goto err_udplite_mib;
804 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
805 if (!net->mib.ipv6_statistics)
806 goto err_ip_mib;
807
808 for_each_possible_cpu(i) {
809 struct ipstats_mib *af_inet6_stats;
810 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
811 u64_stats_init(&af_inet6_stats->syncp);
812 }
813
814
815 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
816 if (!net->mib.icmpv6_statistics)
817 goto err_icmp_mib;
818 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
819 GFP_KERNEL);
820 if (!net->mib.icmpv6msg_statistics)
821 goto err_icmpmsg_mib;
822 return 0;
823
824 err_icmpmsg_mib:
825 free_percpu(net->mib.icmpv6_statistics);
826 err_icmp_mib:
827 free_percpu(net->mib.ipv6_statistics);
828 err_ip_mib:
829 free_percpu(net->mib.udplite_stats_in6);
830 err_udplite_mib:
831 free_percpu(net->mib.udp_stats_in6);
832 return -ENOMEM;
833 }
834
835 static void ipv6_cleanup_mibs(struct net *net)
836 {
837 free_percpu(net->mib.udp_stats_in6);
838 free_percpu(net->mib.udplite_stats_in6);
839 free_percpu(net->mib.ipv6_statistics);
840 free_percpu(net->mib.icmpv6_statistics);
841 kfree(net->mib.icmpv6msg_statistics);
842 }
843
844 static int __net_init inet6_net_init(struct net *net)
845 {
846 int err = 0;
847
848 net->ipv6.sysctl.bindv6only = 0;
849 net->ipv6.sysctl.icmpv6_time = 1*HZ;
850 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
851 net->ipv6.sysctl.flowlabel_consistency = 1;
852 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
853 net->ipv6.sysctl.idgen_retries = 3;
854 net->ipv6.sysctl.idgen_delay = 1 * HZ;
855 net->ipv6.sysctl.flowlabel_state_ranges = 0;
856 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
857 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
858 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
859 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
860 atomic_set(&net->ipv6.fib6_sernum, 1);
861
862 err = ipv6_init_mibs(net);
863 if (err)
864 return err;
865 #ifdef CONFIG_PROC_FS
866 err = udp6_proc_init(net);
867 if (err)
868 goto out;
869 err = tcp6_proc_init(net);
870 if (err)
871 goto proc_tcp6_fail;
872 err = ac6_proc_init(net);
873 if (err)
874 goto proc_ac6_fail;
875 #endif
876 return err;
877
878 #ifdef CONFIG_PROC_FS
879 proc_ac6_fail:
880 tcp6_proc_exit(net);
881 proc_tcp6_fail:
882 udp6_proc_exit(net);
883 out:
884 ipv6_cleanup_mibs(net);
885 return err;
886 #endif
887 }
888
889 static void __net_exit inet6_net_exit(struct net *net)
890 {
891 #ifdef CONFIG_PROC_FS
892 udp6_proc_exit(net);
893 tcp6_proc_exit(net);
894 ac6_proc_exit(net);
895 #endif
896 ipv6_cleanup_mibs(net);
897 }
898
899 static struct pernet_operations inet6_net_ops = {
900 .init = inet6_net_init,
901 .exit = inet6_net_exit,
902 };
903
904 static const struct ipv6_stub ipv6_stub_impl = {
905 .ipv6_sock_mc_join = ipv6_sock_mc_join,
906 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
907 .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
908 .fib6_get_table = fib6_get_table,
909 .fib6_table_lookup = fib6_table_lookup,
910 .fib6_lookup = fib6_lookup,
911 .fib6_multipath_select = fib6_multipath_select,
912 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
913 .udpv6_encap_enable = udpv6_encap_enable,
914 .ndisc_send_na = ndisc_send_na,
915 .nd_tbl = &nd_tbl,
916 };
917
918 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
919 .inet6_bind = __inet6_bind,
920 };
921
922 static int __init inet6_init(void)
923 {
924 struct list_head *r;
925 int err = 0;
926
927 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
928
929 /* Register the socket-side information for inet6_create. */
930 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
931 INIT_LIST_HEAD(r);
932
933 if (disable_ipv6_mod) {
934 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
935 goto out;
936 }
937
938 err = proto_register(&tcpv6_prot, 1);
939 if (err)
940 goto out;
941
942 err = proto_register(&udpv6_prot, 1);
943 if (err)
944 goto out_unregister_tcp_proto;
945
946 err = proto_register(&udplitev6_prot, 1);
947 if (err)
948 goto out_unregister_udp_proto;
949
950 err = proto_register(&rawv6_prot, 1);
951 if (err)
952 goto out_unregister_udplite_proto;
953
954 err = proto_register(&pingv6_prot, 1);
955 if (err)
956 goto out_unregister_raw_proto;
957
958 /* We MUST register RAW sockets before we create the ICMP6,
959 * IGMP6, or NDISC control sockets.
960 */
961 err = rawv6_init();
962 if (err)
963 goto out_unregister_ping_proto;
964
965 /* Register the family here so that the init calls below will
966 * be able to create sockets. (?? is this dangerous ??)
967 */
968 err = sock_register(&inet6_family_ops);
969 if (err)
970 goto out_sock_register_fail;
971
972 /*
973 * ipngwg API draft makes clear that the correct semantics
974 * for TCP and UDP is to consider one TCP and UDP instance
975 * in a host available by both INET and INET6 APIs and
976 * able to communicate via both network protocols.
977 */
978
979 err = register_pernet_subsys(&inet6_net_ops);
980 if (err)
981 goto register_pernet_fail;
982 err = ip6_mr_init();
983 if (err)
984 goto ipmr_fail;
985 err = icmpv6_init();
986 if (err)
987 goto icmp_fail;
988 err = ndisc_init();
989 if (err)
990 goto ndisc_fail;
991 err = igmp6_init();
992 if (err)
993 goto igmp_fail;
994
995 err = ipv6_netfilter_init();
996 if (err)
997 goto netfilter_fail;
998 /* Create /proc/foo6 entries. */
999 #ifdef CONFIG_PROC_FS
1000 err = -ENOMEM;
1001 if (raw6_proc_init())
1002 goto proc_raw6_fail;
1003 if (udplite6_proc_init())
1004 goto proc_udplite6_fail;
1005 if (ipv6_misc_proc_init())
1006 goto proc_misc6_fail;
1007 if (if6_proc_init())
1008 goto proc_if6_fail;
1009 #endif
1010 err = ip6_route_init();
1011 if (err)
1012 goto ip6_route_fail;
1013 err = ndisc_late_init();
1014 if (err)
1015 goto ndisc_late_fail;
1016 err = ip6_flowlabel_init();
1017 if (err)
1018 goto ip6_flowlabel_fail;
1019 err = addrconf_init();
1020 if (err)
1021 goto addrconf_fail;
1022
1023 /* Init v6 extension headers. */
1024 err = ipv6_exthdrs_init();
1025 if (err)
1026 goto ipv6_exthdrs_fail;
1027
1028 err = ipv6_frag_init();
1029 if (err)
1030 goto ipv6_frag_fail;
1031
1032 /* Init v6 transport protocols. */
1033 err = udpv6_init();
1034 if (err)
1035 goto udpv6_fail;
1036
1037 err = udplitev6_init();
1038 if (err)
1039 goto udplitev6_fail;
1040
1041 err = udpv6_offload_init();
1042 if (err)
1043 goto udpv6_offload_fail;
1044
1045 err = tcpv6_init();
1046 if (err)
1047 goto tcpv6_fail;
1048
1049 err = ipv6_packet_init();
1050 if (err)
1051 goto ipv6_packet_fail;
1052
1053 err = pingv6_init();
1054 if (err)
1055 goto pingv6_fail;
1056
1057 err = calipso_init();
1058 if (err)
1059 goto calipso_fail;
1060
1061 err = seg6_init();
1062 if (err)
1063 goto seg6_fail;
1064
1065 err = igmp6_late_init();
1066 if (err)
1067 goto igmp6_late_err;
1068
1069 #ifdef CONFIG_SYSCTL
1070 err = ipv6_sysctl_register();
1071 if (err)
1072 goto sysctl_fail;
1073 #endif
1074
1075 /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1076 wmb();
1077 ipv6_stub = &ipv6_stub_impl;
1078 ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1079 out:
1080 return err;
1081
1082 #ifdef CONFIG_SYSCTL
1083 sysctl_fail:
1084 igmp6_late_cleanup();
1085 #endif
1086 igmp6_late_err:
1087 seg6_exit();
1088 seg6_fail:
1089 calipso_exit();
1090 calipso_fail:
1091 pingv6_exit();
1092 pingv6_fail:
1093 ipv6_packet_cleanup();
1094 ipv6_packet_fail:
1095 tcpv6_exit();
1096 tcpv6_fail:
1097 udpv6_offload_exit();
1098 udpv6_offload_fail:
1099 udplitev6_exit();
1100 udplitev6_fail:
1101 udpv6_exit();
1102 udpv6_fail:
1103 ipv6_frag_exit();
1104 ipv6_frag_fail:
1105 ipv6_exthdrs_exit();
1106 ipv6_exthdrs_fail:
1107 addrconf_cleanup();
1108 addrconf_fail:
1109 ip6_flowlabel_cleanup();
1110 ip6_flowlabel_fail:
1111 ndisc_late_cleanup();
1112 ndisc_late_fail:
1113 ip6_route_cleanup();
1114 ip6_route_fail:
1115 #ifdef CONFIG_PROC_FS
1116 if6_proc_exit();
1117 proc_if6_fail:
1118 ipv6_misc_proc_exit();
1119 proc_misc6_fail:
1120 udplite6_proc_exit();
1121 proc_udplite6_fail:
1122 raw6_proc_exit();
1123 proc_raw6_fail:
1124 #endif
1125 ipv6_netfilter_fini();
1126 netfilter_fail:
1127 igmp6_cleanup();
1128 igmp_fail:
1129 ndisc_cleanup();
1130 ndisc_fail:
1131 icmpv6_cleanup();
1132 icmp_fail:
1133 ip6_mr_cleanup();
1134 ipmr_fail:
1135 unregister_pernet_subsys(&inet6_net_ops);
1136 register_pernet_fail:
1137 sock_unregister(PF_INET6);
1138 rtnl_unregister_all(PF_INET6);
1139 out_sock_register_fail:
1140 rawv6_exit();
1141 out_unregister_ping_proto:
1142 proto_unregister(&pingv6_prot);
1143 out_unregister_raw_proto:
1144 proto_unregister(&rawv6_prot);
1145 out_unregister_udplite_proto:
1146 proto_unregister(&udplitev6_prot);
1147 out_unregister_udp_proto:
1148 proto_unregister(&udpv6_prot);
1149 out_unregister_tcp_proto:
1150 proto_unregister(&tcpv6_prot);
1151 goto out;
1152 }
1153 module_init(inet6_init);
1154
1155 MODULE_ALIAS_NETPROTO(PF_INET6);
Linux with added FPC-III support