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tcp: mitigate scheduling jitter in EDT pacing model
[linux/fpc-iii.git] / net / ipv6 / af_inet6.c
blobe9c8cfdf4b4c7a64be9a68b81a304365a836d2c6
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->mc_all = 1;
213 np->pmtudisc = IPV6_PMTUDISC_WANT;
214 np->repflow = net->ipv6.sysctl.flowlabel_reflect;
215 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
216
217 /* Init the ipv4 part of the socket since we can have sockets
218 * using v6 API for ipv4.
219 */
220 inet->uc_ttl = -1;
221
222 inet->mc_loop = 1;
223 inet->mc_ttl = 1;
224 inet->mc_index = 0;
225 inet->mc_list = NULL;
226 inet->rcv_tos = 0;
227
228 if (net->ipv4.sysctl_ip_no_pmtu_disc)
229 inet->pmtudisc = IP_PMTUDISC_DONT;
230 else
231 inet->pmtudisc = IP_PMTUDISC_WANT;
232 /*
233 * Increment only the relevant sk_prot->socks debug field, this changes
234 * the previous behaviour of incrementing both the equivalent to
235 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
236 *
237 * This allows better debug granularity as we'll know exactly how many
238 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
239 * transport protocol socks. -acme
240 */
241 sk_refcnt_debug_inc(sk);
242
243 if (inet->inet_num) {
244 /* It assumes that any protocol which allows
245 * the user to assign a number at socket
246 * creation time automatically shares.
247 */
248 inet->inet_sport = htons(inet->inet_num);
249 err = sk->sk_prot->hash(sk);
250 if (err) {
251 sk_common_release(sk);
252 goto out;
253 }
254 }
255 if (sk->sk_prot->init) {
256 err = sk->sk_prot->init(sk);
257 if (err) {
258 sk_common_release(sk);
259 goto out;
260 }
261 }
262
263 if (!kern) {
264 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
265 if (err) {
266 sk_common_release(sk);
267 goto out;
268 }
269 }
270 out:
271 return err;
272 out_rcu_unlock:
273 rcu_read_unlock();
274 goto out;
275 }
276
277 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
278 bool force_bind_address_no_port, bool with_lock)
279 {
280 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
281 struct inet_sock *inet = inet_sk(sk);
282 struct ipv6_pinfo *np = inet6_sk(sk);
283 struct net *net = sock_net(sk);
284 __be32 v4addr = 0;
285 unsigned short snum;
286 bool saved_ipv6only;
287 int addr_type = 0;
288 int err = 0;
289
290 if (addr->sin6_family != AF_INET6)
291 return -EAFNOSUPPORT;
292
293 addr_type = ipv6_addr_type(&addr->sin6_addr);
294 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
295 return -EINVAL;
296
297 snum = ntohs(addr->sin6_port);
298 if (snum && snum < inet_prot_sock(net) &&
299 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
300 return -EACCES;
301
302 if (with_lock)
303 lock_sock(sk);
304
305 /* Check these errors (active socket, double bind). */
306 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
307 err = -EINVAL;
308 goto out;
309 }
310
311 /* Check if the address belongs to the host. */
312 if (addr_type == IPV6_ADDR_MAPPED) {
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 /* Reproduce AF_INET checks to make the bindings consistent */
324 v4addr = addr->sin6_addr.s6_addr32[3];
325 chk_addr_ret = inet_addr_type(net, v4addr);
326 if (!inet_can_nonlocal_bind(net, inet) &&
327 v4addr != htonl(INADDR_ANY) &&
328 chk_addr_ret != RTN_LOCAL &&
329 chk_addr_ret != RTN_MULTICAST &&
330 chk_addr_ret != RTN_BROADCAST) {
331 err = -EADDRNOTAVAIL;
332 goto out;
333 }
334 } else {
335 if (addr_type != IPV6_ADDR_ANY) {
336 struct net_device *dev = NULL;
337
338 rcu_read_lock();
339 if (__ipv6_addr_needs_scope_id(addr_type)) {
340 if (addr_len >= sizeof(struct sockaddr_in6) &&
341 addr->sin6_scope_id) {
342 /* Override any existing binding, if another one
343 * is supplied by user.
344 */
345 sk->sk_bound_dev_if = addr->sin6_scope_id;
346 }
347
348 /* Binding to link-local address requires an interface */
349 if (!sk->sk_bound_dev_if) {
350 err = -EINVAL;
351 goto out_unlock;
352 }
353 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
354 if (!dev) {
355 err = -ENODEV;
356 goto out_unlock;
357 }
358 }
359
360 /* ipv4 addr of the socket is invalid. Only the
361 * unspecified and mapped address have a v4 equivalent.
362 */
363 v4addr = LOOPBACK4_IPV6;
364 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
365 if (!ipv6_can_nonlocal_bind(net, inet) &&
366 !ipv6_chk_addr(net, &addr->sin6_addr,
367 dev, 0)) {
368 err = -EADDRNOTAVAIL;
369 goto out_unlock;
370 }
371 }
372 rcu_read_unlock();
373 }
374 }
375
376 inet->inet_rcv_saddr = v4addr;
377 inet->inet_saddr = v4addr;
378
379 sk->sk_v6_rcv_saddr = addr->sin6_addr;
380
381 if (!(addr_type & IPV6_ADDR_MULTICAST))
382 np->saddr = addr->sin6_addr;
383
384 saved_ipv6only = sk->sk_ipv6only;
385 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
386 sk->sk_ipv6only = 1;
387
388 /* Make sure we are allowed to bind here. */
389 if (snum || !(inet->bind_address_no_port ||
390 force_bind_address_no_port)) {
391 if (sk->sk_prot->get_port(sk, snum)) {
392 sk->sk_ipv6only = saved_ipv6only;
393 inet_reset_saddr(sk);
394 err = -EADDRINUSE;
395 goto out;
396 }
397 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
398 if (err) {
399 sk->sk_ipv6only = saved_ipv6only;
400 inet_reset_saddr(sk);
401 goto out;
402 }
403 }
404
405 if (addr_type != IPV6_ADDR_ANY)
406 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
407 if (snum)
408 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
409 inet->inet_sport = htons(inet->inet_num);
410 inet->inet_dport = 0;
411 inet->inet_daddr = 0;
412 out:
413 if (with_lock)
414 release_sock(sk);
415 return err;
416 out_unlock:
417 rcu_read_unlock();
418 goto out;
419 }
420
421 /* bind for INET6 API */
422 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
423 {
424 struct sock *sk = sock->sk;
425 int err = 0;
426
427 /* If the socket has its own bind function then use it. */
428 if (sk->sk_prot->bind)
429 return sk->sk_prot->bind(sk, uaddr, addr_len);
430
431 if (addr_len < SIN6_LEN_RFC2133)
432 return -EINVAL;
433
434 /* BPF prog is run before any checks are done so that if the prog
435 * changes context in a wrong way it will be caught.
436 */
437 err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr);
438 if (err)
439 return err;
440
441 return __inet6_bind(sk, uaddr, addr_len, false, true);
442 }
443 EXPORT_SYMBOL(inet6_bind);
444
445 int inet6_release(struct socket *sock)
446 {
447 struct sock *sk = sock->sk;
448
449 if (!sk)
450 return -EINVAL;
451
452 /* Free mc lists */
453 ipv6_sock_mc_close(sk);
454
455 /* Free ac lists */
456 ipv6_sock_ac_close(sk);
457
458 return inet_release(sock);
459 }
460 EXPORT_SYMBOL(inet6_release);
461
462 void inet6_destroy_sock(struct sock *sk)
463 {
464 struct ipv6_pinfo *np = inet6_sk(sk);
465 struct sk_buff *skb;
466 struct ipv6_txoptions *opt;
467
468 /* Release rx options */
469
470 skb = xchg(&np->pktoptions, NULL);
471 kfree_skb(skb);
472
473 skb = xchg(&np->rxpmtu, NULL);
474 kfree_skb(skb);
475
476 /* Free flowlabels */
477 fl6_free_socklist(sk);
478
479 /* Free tx options */
480
481 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
482 if (opt) {
483 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
484 txopt_put(opt);
485 }
486 }
487 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
488
489 /*
490 * This does both peername and sockname.
491 */
492
493 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
494 int peer)
495 {
496 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
497 struct sock *sk = sock->sk;
498 struct inet_sock *inet = inet_sk(sk);
499 struct ipv6_pinfo *np = inet6_sk(sk);
500
501 sin->sin6_family = AF_INET6;
502 sin->sin6_flowinfo = 0;
503 sin->sin6_scope_id = 0;
504 if (peer) {
505 if (!inet->inet_dport)
506 return -ENOTCONN;
507 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
508 peer == 1)
509 return -ENOTCONN;
510 sin->sin6_port = inet->inet_dport;
511 sin->sin6_addr = sk->sk_v6_daddr;
512 if (np->sndflow)
513 sin->sin6_flowinfo = np->flow_label;
514 } else {
515 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
516 sin->sin6_addr = np->saddr;
517 else
518 sin->sin6_addr = sk->sk_v6_rcv_saddr;
519
520 sin->sin6_port = inet->inet_sport;
521 }
522 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
523 sk->sk_bound_dev_if);
524 return sizeof(*sin);
525 }
526 EXPORT_SYMBOL(inet6_getname);
527
528 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
529 {
530 struct sock *sk = sock->sk;
531 struct net *net = sock_net(sk);
532
533 switch (cmd) {
534 case SIOCGSTAMP:
535 return sock_get_timestamp(sk, (struct timeval __user *)arg);
536
537 case SIOCGSTAMPNS:
538 return sock_get_timestampns(sk, (struct timespec __user *)arg);
539
540 case SIOCADDRT:
541 case SIOCDELRT:
542
543 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
544
545 case SIOCSIFADDR:
546 return addrconf_add_ifaddr(net, (void __user *) arg);
547 case SIOCDIFADDR:
548 return addrconf_del_ifaddr(net, (void __user *) arg);
549 case SIOCSIFDSTADDR:
550 return addrconf_set_dstaddr(net, (void __user *) arg);
551 default:
552 if (!sk->sk_prot->ioctl)
553 return -ENOIOCTLCMD;
554 return sk->sk_prot->ioctl(sk, cmd, arg);
555 }
556 /*NOTREACHED*/
557 return 0;
558 }
559 EXPORT_SYMBOL(inet6_ioctl);
560
561 const struct proto_ops inet6_stream_ops = {
562 .family = PF_INET6,
563 .owner = THIS_MODULE,
564 .release = inet6_release,
565 .bind = inet6_bind,
566 .connect = inet_stream_connect, /* ok */
567 .socketpair = sock_no_socketpair, /* a do nothing */
568 .accept = inet_accept, /* ok */
569 .getname = inet6_getname,
570 .poll = tcp_poll, /* ok */
571 .ioctl = inet6_ioctl, /* must change */
572 .listen = inet_listen, /* ok */
573 .shutdown = inet_shutdown, /* ok */
574 .setsockopt = sock_common_setsockopt, /* ok */
575 .getsockopt = sock_common_getsockopt, /* ok */
576 .sendmsg = inet_sendmsg, /* ok */
577 .recvmsg = inet_recvmsg, /* ok */
578 #ifdef CONFIG_MMU
579 .mmap = tcp_mmap,
580 #endif
581 .sendpage = inet_sendpage,
582 .sendmsg_locked = tcp_sendmsg_locked,
583 .sendpage_locked = tcp_sendpage_locked,
584 .splice_read = tcp_splice_read,
585 .read_sock = tcp_read_sock,
586 .peek_len = tcp_peek_len,
587 #ifdef CONFIG_COMPAT
588 .compat_setsockopt = compat_sock_common_setsockopt,
589 .compat_getsockopt = compat_sock_common_getsockopt,
590 #endif
591 .set_rcvlowat = tcp_set_rcvlowat,
592 };
593
594 const struct proto_ops inet6_dgram_ops = {
595 .family = PF_INET6,
596 .owner = THIS_MODULE,
597 .release = inet6_release,
598 .bind = inet6_bind,
599 .connect = inet_dgram_connect, /* ok */
600 .socketpair = sock_no_socketpair, /* a do nothing */
601 .accept = sock_no_accept, /* a do nothing */
602 .getname = inet6_getname,
603 .poll = udp_poll, /* ok */
604 .ioctl = inet6_ioctl, /* must change */
605 .listen = sock_no_listen, /* ok */
606 .shutdown = inet_shutdown, /* ok */
607 .setsockopt = sock_common_setsockopt, /* ok */
608 .getsockopt = sock_common_getsockopt, /* ok */
609 .sendmsg = inet_sendmsg, /* ok */
610 .recvmsg = inet_recvmsg, /* ok */
611 .mmap = sock_no_mmap,
612 .sendpage = sock_no_sendpage,
613 .set_peek_off = sk_set_peek_off,
614 #ifdef CONFIG_COMPAT
615 .compat_setsockopt = compat_sock_common_setsockopt,
616 .compat_getsockopt = compat_sock_common_getsockopt,
617 #endif
618 };
619
620 static const struct net_proto_family inet6_family_ops = {
621 .family = PF_INET6,
622 .create = inet6_create,
623 .owner = THIS_MODULE,
624 };
625
626 int inet6_register_protosw(struct inet_protosw *p)
627 {
628 struct list_head *lh;
629 struct inet_protosw *answer;
630 struct list_head *last_perm;
631 int protocol = p->protocol;
632 int ret;
633
634 spin_lock_bh(&inetsw6_lock);
635
636 ret = -EINVAL;
637 if (p->type >= SOCK_MAX)
638 goto out_illegal;
639
640 /* If we are trying to override a permanent protocol, bail. */
641 answer = NULL;
642 ret = -EPERM;
643 last_perm = &inetsw6[p->type];
644 list_for_each(lh, &inetsw6[p->type]) {
645 answer = list_entry(lh, struct inet_protosw, list);
646
647 /* Check only the non-wild match. */
648 if (INET_PROTOSW_PERMANENT & answer->flags) {
649 if (protocol == answer->protocol)
650 break;
651 last_perm = lh;
652 }
653
654 answer = NULL;
655 }
656 if (answer)
657 goto out_permanent;
658
659 /* Add the new entry after the last permanent entry if any, so that
660 * the new entry does not override a permanent entry when matched with
661 * a wild-card protocol. But it is allowed to override any existing
662 * non-permanent entry. This means that when we remove this entry, the
663 * system automatically returns to the old behavior.
664 */
665 list_add_rcu(&p->list, last_perm);
666 ret = 0;
667 out:
668 spin_unlock_bh(&inetsw6_lock);
669 return ret;
670
671 out_permanent:
672 pr_err("Attempt to override permanent protocol %d\n", protocol);
673 goto out;
674
675 out_illegal:
676 pr_err("Ignoring attempt to register invalid socket type %d\n",
677 p->type);
678 goto out;
679 }
680 EXPORT_SYMBOL(inet6_register_protosw);
681
682 void
683 inet6_unregister_protosw(struct inet_protosw *p)
684 {
685 if (INET_PROTOSW_PERMANENT & p->flags) {
686 pr_err("Attempt to unregister permanent protocol %d\n",
687 p->protocol);
688 } else {
689 spin_lock_bh(&inetsw6_lock);
690 list_del_rcu(&p->list);
691 spin_unlock_bh(&inetsw6_lock);
692
693 synchronize_net();
694 }
695 }
696 EXPORT_SYMBOL(inet6_unregister_protosw);
697
698 int inet6_sk_rebuild_header(struct sock *sk)
699 {
700 struct ipv6_pinfo *np = inet6_sk(sk);
701 struct dst_entry *dst;
702
703 dst = __sk_dst_check(sk, np->dst_cookie);
704
705 if (!dst) {
706 struct inet_sock *inet = inet_sk(sk);
707 struct in6_addr *final_p, final;
708 struct flowi6 fl6;
709
710 memset(&fl6, 0, sizeof(fl6));
711 fl6.flowi6_proto = sk->sk_protocol;
712 fl6.daddr = sk->sk_v6_daddr;
713 fl6.saddr = np->saddr;
714 fl6.flowlabel = np->flow_label;
715 fl6.flowi6_oif = sk->sk_bound_dev_if;
716 fl6.flowi6_mark = sk->sk_mark;
717 fl6.fl6_dport = inet->inet_dport;
718 fl6.fl6_sport = inet->inet_sport;
719 fl6.flowi6_uid = sk->sk_uid;
720 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
721
722 rcu_read_lock();
723 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
724 &final);
725 rcu_read_unlock();
726
727 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
728 if (IS_ERR(dst)) {
729 sk->sk_route_caps = 0;
730 sk->sk_err_soft = -PTR_ERR(dst);
731 return PTR_ERR(dst);
732 }
733
734 ip6_dst_store(sk, dst, NULL, NULL);
735 }
736
737 return 0;
738 }
739 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
740
741 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
742 const struct inet6_skb_parm *opt)
743 {
744 const struct ipv6_pinfo *np = inet6_sk(sk);
745
746 if (np->rxopt.all) {
747 if (((opt->flags & IP6SKB_HOPBYHOP) &&
748 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
749 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
750 np->rxopt.bits.rxflow) ||
751 (opt->srcrt && (np->rxopt.bits.srcrt ||
752 np->rxopt.bits.osrcrt)) ||
753 ((opt->dst1 || opt->dst0) &&
754 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
755 return true;
756 }
757 return false;
758 }
759 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
760
761 static struct packet_type ipv6_packet_type __read_mostly = {
762 .type = cpu_to_be16(ETH_P_IPV6),
763 .func = ipv6_rcv,
764 .list_func = ipv6_list_rcv,
765 };
766
767 static int __init ipv6_packet_init(void)
768 {
769 dev_add_pack(&ipv6_packet_type);
770 return 0;
771 }
772
773 static void ipv6_packet_cleanup(void)
774 {
775 dev_remove_pack(&ipv6_packet_type);
776 }
777
778 static int __net_init ipv6_init_mibs(struct net *net)
779 {
780 int i;
781
782 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
783 if (!net->mib.udp_stats_in6)
784 return -ENOMEM;
785 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
786 if (!net->mib.udplite_stats_in6)
787 goto err_udplite_mib;
788 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
789 if (!net->mib.ipv6_statistics)
790 goto err_ip_mib;
791
792 for_each_possible_cpu(i) {
793 struct ipstats_mib *af_inet6_stats;
794 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
795 u64_stats_init(&af_inet6_stats->syncp);
796 }
797
798
799 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
800 if (!net->mib.icmpv6_statistics)
801 goto err_icmp_mib;
802 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
803 GFP_KERNEL);
804 if (!net->mib.icmpv6msg_statistics)
805 goto err_icmpmsg_mib;
806 return 0;
807
808 err_icmpmsg_mib:
809 free_percpu(net->mib.icmpv6_statistics);
810 err_icmp_mib:
811 free_percpu(net->mib.ipv6_statistics);
812 err_ip_mib:
813 free_percpu(net->mib.udplite_stats_in6);
814 err_udplite_mib:
815 free_percpu(net->mib.udp_stats_in6);
816 return -ENOMEM;
817 }
818
819 static void ipv6_cleanup_mibs(struct net *net)
820 {
821 free_percpu(net->mib.udp_stats_in6);
822 free_percpu(net->mib.udplite_stats_in6);
823 free_percpu(net->mib.ipv6_statistics);
824 free_percpu(net->mib.icmpv6_statistics);
825 kfree(net->mib.icmpv6msg_statistics);
826 }
827
828 static int __net_init inet6_net_init(struct net *net)
829 {
830 int err = 0;
831
832 net->ipv6.sysctl.bindv6only = 0;
833 net->ipv6.sysctl.icmpv6_time = 1*HZ;
834 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
835 net->ipv6.sysctl.flowlabel_consistency = 1;
836 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
837 net->ipv6.sysctl.idgen_retries = 3;
838 net->ipv6.sysctl.idgen_delay = 1 * HZ;
839 net->ipv6.sysctl.flowlabel_state_ranges = 0;
840 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
841 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
842 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
843 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
844 atomic_set(&net->ipv6.fib6_sernum, 1);
845
846 err = ipv6_init_mibs(net);
847 if (err)
848 return err;
849 #ifdef CONFIG_PROC_FS
850 err = udp6_proc_init(net);
851 if (err)
852 goto out;
853 err = tcp6_proc_init(net);
854 if (err)
855 goto proc_tcp6_fail;
856 err = ac6_proc_init(net);
857 if (err)
858 goto proc_ac6_fail;
859 #endif
860 return err;
861
862 #ifdef CONFIG_PROC_FS
863 proc_ac6_fail:
864 tcp6_proc_exit(net);
865 proc_tcp6_fail:
866 udp6_proc_exit(net);
867 out:
868 ipv6_cleanup_mibs(net);
869 return err;
870 #endif
871 }
872
873 static void __net_exit inet6_net_exit(struct net *net)
874 {
875 #ifdef CONFIG_PROC_FS
876 udp6_proc_exit(net);
877 tcp6_proc_exit(net);
878 ac6_proc_exit(net);
879 #endif
880 ipv6_cleanup_mibs(net);
881 }
882
883 static struct pernet_operations inet6_net_ops = {
884 .init = inet6_net_init,
885 .exit = inet6_net_exit,
886 };
887
888 static const struct ipv6_stub ipv6_stub_impl = {
889 .ipv6_sock_mc_join = ipv6_sock_mc_join,
890 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
891 .ipv6_dst_lookup = ip6_dst_lookup,
892 .fib6_get_table = fib6_get_table,
893 .fib6_table_lookup = fib6_table_lookup,
894 .fib6_lookup = fib6_lookup,
895 .fib6_multipath_select = fib6_multipath_select,
896 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
897 .udpv6_encap_enable = udpv6_encap_enable,
898 .ndisc_send_na = ndisc_send_na,
899 .nd_tbl = &nd_tbl,
900 };
901
902 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
903 .inet6_bind = __inet6_bind,
904 };
905
906 static int __init inet6_init(void)
907 {
908 struct list_head *r;
909 int err = 0;
910
911 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
912
913 /* Register the socket-side information for inet6_create. */
914 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
915 INIT_LIST_HEAD(r);
916
917 if (disable_ipv6_mod) {
918 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
919 goto out;
920 }
921
922 err = proto_register(&tcpv6_prot, 1);
923 if (err)
924 goto out;
925
926 err = proto_register(&udpv6_prot, 1);
927 if (err)
928 goto out_unregister_tcp_proto;
929
930 err = proto_register(&udplitev6_prot, 1);
931 if (err)
932 goto out_unregister_udp_proto;
933
934 err = proto_register(&rawv6_prot, 1);
935 if (err)
936 goto out_unregister_udplite_proto;
937
938 err = proto_register(&pingv6_prot, 1);
939 if (err)
940 goto out_unregister_raw_proto;
941
942 /* We MUST register RAW sockets before we create the ICMP6,
943 * IGMP6, or NDISC control sockets.
944 */
945 err = rawv6_init();
946 if (err)
947 goto out_unregister_ping_proto;
948
949 /* Register the family here so that the init calls below will
950 * be able to create sockets. (?? is this dangerous ??)
951 */
952 err = sock_register(&inet6_family_ops);
953 if (err)
954 goto out_sock_register_fail;
955
956 /*
957 * ipngwg API draft makes clear that the correct semantics
958 * for TCP and UDP is to consider one TCP and UDP instance
959 * in a host available by both INET and INET6 APIs and
960 * able to communicate via both network protocols.
961 */
962
963 err = register_pernet_subsys(&inet6_net_ops);
964 if (err)
965 goto register_pernet_fail;
966 err = ip6_mr_init();
967 if (err)
968 goto ipmr_fail;
969 err = icmpv6_init();
970 if (err)
971 goto icmp_fail;
972 err = ndisc_init();
973 if (err)
974 goto ndisc_fail;
975 err = igmp6_init();
976 if (err)
977 goto igmp_fail;
978
979 err = ipv6_netfilter_init();
980 if (err)
981 goto netfilter_fail;
982 /* Create /proc/foo6 entries. */
983 #ifdef CONFIG_PROC_FS
984 err = -ENOMEM;
985 if (raw6_proc_init())
986 goto proc_raw6_fail;
987 if (udplite6_proc_init())
988 goto proc_udplite6_fail;
989 if (ipv6_misc_proc_init())
990 goto proc_misc6_fail;
991 if (if6_proc_init())
992 goto proc_if6_fail;
993 #endif
994 err = ip6_route_init();
995 if (err)
996 goto ip6_route_fail;
997 err = ndisc_late_init();
998 if (err)
999 goto ndisc_late_fail;
1000 err = ip6_flowlabel_init();
1001 if (err)
1002 goto ip6_flowlabel_fail;
1003 err = addrconf_init();
1004 if (err)
1005 goto addrconf_fail;
1006
1007 /* Init v6 extension headers. */
1008 err = ipv6_exthdrs_init();
1009 if (err)
1010 goto ipv6_exthdrs_fail;
1011
1012 err = ipv6_frag_init();
1013 if (err)
1014 goto ipv6_frag_fail;
1015
1016 /* Init v6 transport protocols. */
1017 err = udpv6_init();
1018 if (err)
1019 goto udpv6_fail;
1020
1021 err = udplitev6_init();
1022 if (err)
1023 goto udplitev6_fail;
1024
1025 err = udpv6_offload_init();
1026 if (err)
1027 goto udpv6_offload_fail;
1028
1029 err = tcpv6_init();
1030 if (err)
1031 goto tcpv6_fail;
1032
1033 err = ipv6_packet_init();
1034 if (err)
1035 goto ipv6_packet_fail;
1036
1037 err = pingv6_init();
1038 if (err)
1039 goto pingv6_fail;
1040
1041 err = calipso_init();
1042 if (err)
1043 goto calipso_fail;
1044
1045 err = seg6_init();
1046 if (err)
1047 goto seg6_fail;
1048
1049 err = igmp6_late_init();
1050 if (err)
1051 goto igmp6_late_err;
1052
1053 #ifdef CONFIG_SYSCTL
1054 err = ipv6_sysctl_register();
1055 if (err)
1056 goto sysctl_fail;
1057 #endif
1058
1059 /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1060 wmb();
1061 ipv6_stub = &ipv6_stub_impl;
1062 ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1063 out:
1064 return err;
1065
1066 #ifdef CONFIG_SYSCTL
1067 sysctl_fail:
1068 igmp6_late_cleanup();
1069 #endif
1070 igmp6_late_err:
1071 seg6_exit();
1072 seg6_fail:
1073 calipso_exit();
1074 calipso_fail:
1075 pingv6_exit();
1076 pingv6_fail:
1077 ipv6_packet_cleanup();
1078 ipv6_packet_fail:
1079 tcpv6_exit();
1080 tcpv6_fail:
1081 udpv6_offload_exit();
1082 udpv6_offload_fail:
1083 udplitev6_exit();
1084 udplitev6_fail:
1085 udpv6_exit();
1086 udpv6_fail:
1087 ipv6_frag_exit();
1088 ipv6_frag_fail:
1089 ipv6_exthdrs_exit();
1090 ipv6_exthdrs_fail:
1091 addrconf_cleanup();
1092 addrconf_fail:
1093 ip6_flowlabel_cleanup();
1094 ip6_flowlabel_fail:
1095 ndisc_late_cleanup();
1096 ndisc_late_fail:
1097 ip6_route_cleanup();
1098 ip6_route_fail:
1099 #ifdef CONFIG_PROC_FS
1100 if6_proc_exit();
1101 proc_if6_fail:
1102 ipv6_misc_proc_exit();
1103 proc_misc6_fail:
1104 udplite6_proc_exit();
1105 proc_udplite6_fail:
1106 raw6_proc_exit();
1107 proc_raw6_fail:
1108 #endif
1109 ipv6_netfilter_fini();
1110 netfilter_fail:
1111 igmp6_cleanup();
1112 igmp_fail:
1113 ndisc_cleanup();
1114 ndisc_fail:
1115 icmpv6_cleanup();
1116 icmp_fail:
1117 ip6_mr_cleanup();
1118 ipmr_fail:
1119 unregister_pernet_subsys(&inet6_net_ops);
1120 register_pernet_fail:
1121 sock_unregister(PF_INET6);
1122 rtnl_unregister_all(PF_INET6);
1123 out_sock_register_fail:
1124 rawv6_exit();
1125 out_unregister_ping_proto:
1126 proto_unregister(&pingv6_prot);
1127 out_unregister_raw_proto:
1128 proto_unregister(&rawv6_prot);
1129 out_unregister_udplite_proto:
1130 proto_unregister(&udplitev6_prot);
1131 out_unregister_udp_proto:
1132 proto_unregister(&udpv6_prot);
1133 out_unregister_tcp_proto:
1134 proto_unregister(&tcpv6_prot);
1135 goto out;
1136 }
1137 module_init(inet6_init);
1138
1139 MODULE_ALIAS_NETPROTO(PF_INET6);
Linux with added FPC-III support