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
ipv6_mod_enabled(void)97 bool ipv6_mod_enabled(void)
98 {
99 return disable_ipv6_mod == 0;
100 }
101 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
102
inet6_sk_generic(struct sock * sk)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
inet6_create(struct net * net,struct socket * sock,int protocol,int kern)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
__inet6_bind(struct sock * sk,struct sockaddr * uaddr,int addr_len,bool force_bind_address_no_port,bool with_lock)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 int chk_addr_ret;
313
314 /* Binding to v4-mapped address on a v6-only socket
315 * makes no sense
316 */
317 if (sk->sk_ipv6only) {
318 err = -EINVAL;
319 goto out;
320 }
321
322 /* Reproduce AF_INET checks to make the bindings consistent */
323 v4addr = addr->sin6_addr.s6_addr32[3];
324 chk_addr_ret = inet_addr_type(net, v4addr);
325 if (!inet_can_nonlocal_bind(net, inet) &&
326 v4addr != htonl(INADDR_ANY) &&
327 chk_addr_ret != RTN_LOCAL &&
328 chk_addr_ret != RTN_MULTICAST &&
329 chk_addr_ret != RTN_BROADCAST) {
330 err = -EADDRNOTAVAIL;
331 goto out;
332 }
333 } else {
334 if (addr_type != IPV6_ADDR_ANY) {
335 struct net_device *dev = NULL;
336
337 rcu_read_lock();
338 if (__ipv6_addr_needs_scope_id(addr_type)) {
339 if (addr_len >= sizeof(struct sockaddr_in6) &&
340 addr->sin6_scope_id) {
341 /* Override any existing binding, if another one
342 * is supplied by user.
343 */
344 sk->sk_bound_dev_if = addr->sin6_scope_id;
345 }
346
347 /* Binding to link-local address requires an interface */
348 if (!sk->sk_bound_dev_if) {
349 err = -EINVAL;
350 goto out_unlock;
351 }
352 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
353 if (!dev) {
354 err = -ENODEV;
355 goto out_unlock;
356 }
357 }
358
359 /* ipv4 addr of the socket is invalid. Only the
360 * unspecified and mapped address have a v4 equivalent.
361 */
362 v4addr = LOOPBACK4_IPV6;
363 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
364 if (!ipv6_can_nonlocal_bind(net, inet) &&
365 !ipv6_chk_addr(net, &addr->sin6_addr,
366 dev, 0)) {
367 err = -EADDRNOTAVAIL;
368 goto out_unlock;
369 }
370 }
371 rcu_read_unlock();
372 }
373 }
374
375 inet->inet_rcv_saddr = v4addr;
376 inet->inet_saddr = v4addr;
377
378 sk->sk_v6_rcv_saddr = addr->sin6_addr;
379
380 if (!(addr_type & IPV6_ADDR_MULTICAST))
381 np->saddr = addr->sin6_addr;
382
383 saved_ipv6only = sk->sk_ipv6only;
384 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
385 sk->sk_ipv6only = 1;
386
387 /* Make sure we are allowed to bind here. */
388 if (snum || !(inet->bind_address_no_port ||
389 force_bind_address_no_port)) {
390 if (sk->sk_prot->get_port(sk, snum)) {
391 sk->sk_ipv6only = saved_ipv6only;
392 inet_reset_saddr(sk);
393 err = -EADDRINUSE;
394 goto out;
395 }
396 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
397 if (err) {
398 sk->sk_ipv6only = saved_ipv6only;
399 inet_reset_saddr(sk);
400 goto out;
401 }
402 }
403
404 if (addr_type != IPV6_ADDR_ANY)
405 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
406 if (snum)
407 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
408 inet->inet_sport = htons(inet->inet_num);
409 inet->inet_dport = 0;
410 inet->inet_daddr = 0;
411 out:
412 if (with_lock)
413 release_sock(sk);
414 return err;
415 out_unlock:
416 rcu_read_unlock();
417 goto out;
418 }
419
420 /* bind for INET6 API */
inet6_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)421 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
422 {
423 struct sock *sk = sock->sk;
424 int err = 0;
425
426 /* If the socket has its own bind function then use it. */
427 if (sk->sk_prot->bind)
428 return sk->sk_prot->bind(sk, uaddr, addr_len);
429
430 if (addr_len < SIN6_LEN_RFC2133)
431 return -EINVAL;
432
433 /* BPF prog is run before any checks are done so that if the prog
434 * changes context in a wrong way it will be caught.
435 */
436 err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr);
437 if (err)
438 return err;
439
440 return __inet6_bind(sk, uaddr, addr_len, false, true);
441 }
442 EXPORT_SYMBOL(inet6_bind);
443
inet6_release(struct socket * sock)444 int inet6_release(struct socket *sock)
445 {
446 struct sock *sk = sock->sk;
447
448 if (!sk)
449 return -EINVAL;
450
451 /* Free mc lists */
452 ipv6_sock_mc_close(sk);
453
454 /* Free ac lists */
455 ipv6_sock_ac_close(sk);
456
457 return inet_release(sock);
458 }
459 EXPORT_SYMBOL(inet6_release);
460
inet6_destroy_sock(struct sock * sk)461 void inet6_destroy_sock(struct sock *sk)
462 {
463 struct ipv6_pinfo *np = inet6_sk(sk);
464 struct sk_buff *skb;
465 struct ipv6_txoptions *opt;
466
467 /* Release rx options */
468
469 skb = xchg(&np->pktoptions, NULL);
470 if (skb)
471 kfree_skb(skb);
472
473 skb = xchg(&np->rxpmtu, NULL);
474 if (skb)
475 kfree_skb(skb);
476
477 /* Free flowlabels */
478 fl6_free_socklist(sk);
479
480 /* Free tx options */
481
482 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
483 if (opt) {
484 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
485 txopt_put(opt);
486 }
487 }
488 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
489
490 /*
491 * This does both peername and sockname.
492 */
493
inet6_getname(struct socket * sock,struct sockaddr * uaddr,int peer)494 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
495 int peer)
496 {
497 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
498 struct sock *sk = sock->sk;
499 struct inet_sock *inet = inet_sk(sk);
500 struct ipv6_pinfo *np = inet6_sk(sk);
501
502 sin->sin6_family = AF_INET6;
503 sin->sin6_flowinfo = 0;
504 sin->sin6_scope_id = 0;
505 if (peer) {
506 if (!inet->inet_dport)
507 return -ENOTCONN;
508 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
509 peer == 1)
510 return -ENOTCONN;
511 sin->sin6_port = inet->inet_dport;
512 sin->sin6_addr = sk->sk_v6_daddr;
513 if (np->sndflow)
514 sin->sin6_flowinfo = np->flow_label;
515 } else {
516 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
517 sin->sin6_addr = np->saddr;
518 else
519 sin->sin6_addr = sk->sk_v6_rcv_saddr;
520
521 sin->sin6_port = inet->inet_sport;
522 }
523 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
524 sk->sk_bound_dev_if);
525 return sizeof(*sin);
526 }
527 EXPORT_SYMBOL(inet6_getname);
528
inet6_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)529 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
530 {
531 struct sock *sk = sock->sk;
532 struct net *net = sock_net(sk);
533
534 switch (cmd) {
535 case SIOCGSTAMP:
536 return sock_get_timestamp(sk, (struct timeval __user *)arg);
537
538 case SIOCGSTAMPNS:
539 return sock_get_timestampns(sk, (struct timespec __user *)arg);
540
541 case SIOCADDRT:
542 case SIOCDELRT:
543
544 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
545
546 case SIOCSIFADDR:
547 return addrconf_add_ifaddr(net, (void __user *) arg);
548 case SIOCDIFADDR:
549 return addrconf_del_ifaddr(net, (void __user *) arg);
550 case SIOCSIFDSTADDR:
551 return addrconf_set_dstaddr(net, (void __user *) arg);
552 default:
553 if (!sk->sk_prot->ioctl)
554 return -ENOIOCTLCMD;
555 return sk->sk_prot->ioctl(sk, cmd, arg);
556 }
557 /*NOTREACHED*/
558 return 0;
559 }
560 EXPORT_SYMBOL(inet6_ioctl);
561
562 const struct proto_ops inet6_stream_ops = {
563 .family = PF_INET6,
564 .owner = THIS_MODULE,
565 .release = inet6_release,
566 .bind = inet6_bind,
567 .connect = inet_stream_connect, /* ok */
568 .socketpair = sock_no_socketpair, /* a do nothing */
569 .accept = inet_accept, /* ok */
570 .getname = inet6_getname,
571 .poll = tcp_poll, /* ok */
572 .ioctl = inet6_ioctl, /* must change */
573 .listen = inet_listen, /* ok */
574 .shutdown = inet_shutdown, /* ok */
575 .setsockopt = sock_common_setsockopt, /* ok */
576 .getsockopt = sock_common_getsockopt, /* ok */
577 .sendmsg = inet_sendmsg, /* ok */
578 .recvmsg = inet_recvmsg, /* ok */
579 #ifdef CONFIG_MMU
580 .mmap = tcp_mmap,
581 #endif
582 .sendpage = inet_sendpage,
583 .sendmsg_locked = tcp_sendmsg_locked,
584 .sendpage_locked = tcp_sendpage_locked,
585 .splice_read = tcp_splice_read,
586 .read_sock = tcp_read_sock,
587 .peek_len = tcp_peek_len,
588 #ifdef CONFIG_COMPAT
589 .compat_setsockopt = compat_sock_common_setsockopt,
590 .compat_getsockopt = compat_sock_common_getsockopt,
591 #endif
592 .set_rcvlowat = tcp_set_rcvlowat,
593 };
594
595 const struct proto_ops inet6_dgram_ops = {
596 .family = PF_INET6,
597 .owner = THIS_MODULE,
598 .release = inet6_release,
599 .bind = inet6_bind,
600 .connect = inet_dgram_connect, /* ok */
601 .socketpair = sock_no_socketpair, /* a do nothing */
602 .accept = sock_no_accept, /* a do nothing */
603 .getname = inet6_getname,
604 .poll = udp_poll, /* ok */
605 .ioctl = inet6_ioctl, /* must change */
606 .listen = sock_no_listen, /* ok */
607 .shutdown = inet_shutdown, /* ok */
608 .setsockopt = sock_common_setsockopt, /* ok */
609 .getsockopt = sock_common_getsockopt, /* ok */
610 .sendmsg = inet_sendmsg, /* ok */
611 .recvmsg = inet_recvmsg, /* ok */
612 .mmap = sock_no_mmap,
613 .sendpage = sock_no_sendpage,
614 .set_peek_off = sk_set_peek_off,
615 #ifdef CONFIG_COMPAT
616 .compat_setsockopt = compat_sock_common_setsockopt,
617 .compat_getsockopt = compat_sock_common_getsockopt,
618 #endif
619 };
620
621 static const struct net_proto_family inet6_family_ops = {
622 .family = PF_INET6,
623 .create = inet6_create,
624 .owner = THIS_MODULE,
625 };
626
inet6_register_protosw(struct inet_protosw * p)627 int inet6_register_protosw(struct inet_protosw *p)
628 {
629 struct list_head *lh;
630 struct inet_protosw *answer;
631 struct list_head *last_perm;
632 int protocol = p->protocol;
633 int ret;
634
635 spin_lock_bh(&inetsw6_lock);
636
637 ret = -EINVAL;
638 if (p->type >= SOCK_MAX)
639 goto out_illegal;
640
641 /* If we are trying to override a permanent protocol, bail. */
642 answer = NULL;
643 ret = -EPERM;
644 last_perm = &inetsw6[p->type];
645 list_for_each(lh, &inetsw6[p->type]) {
646 answer = list_entry(lh, struct inet_protosw, list);
647
648 /* Check only the non-wild match. */
649 if (INET_PROTOSW_PERMANENT & answer->flags) {
650 if (protocol == answer->protocol)
651 break;
652 last_perm = lh;
653 }
654
655 answer = NULL;
656 }
657 if (answer)
658 goto out_permanent;
659
660 /* Add the new entry after the last permanent entry if any, so that
661 * the new entry does not override a permanent entry when matched with
662 * a wild-card protocol. But it is allowed to override any existing
663 * non-permanent entry. This means that when we remove this entry, the
664 * system automatically returns to the old behavior.
665 */
666 list_add_rcu(&p->list, last_perm);
667 ret = 0;
668 out:
669 spin_unlock_bh(&inetsw6_lock);
670 return ret;
671
672 out_permanent:
673 pr_err("Attempt to override permanent protocol %d\n", protocol);
674 goto out;
675
676 out_illegal:
677 pr_err("Ignoring attempt to register invalid socket type %d\n",
678 p->type);
679 goto out;
680 }
681 EXPORT_SYMBOL(inet6_register_protosw);
682
683 void
inet6_unregister_protosw(struct inet_protosw * p)684 inet6_unregister_protosw(struct inet_protosw *p)
685 {
686 if (INET_PROTOSW_PERMANENT & p->flags) {
687 pr_err("Attempt to unregister permanent protocol %d\n",
688 p->protocol);
689 } else {
690 spin_lock_bh(&inetsw6_lock);
691 list_del_rcu(&p->list);
692 spin_unlock_bh(&inetsw6_lock);
693
694 synchronize_net();
695 }
696 }
697 EXPORT_SYMBOL(inet6_unregister_protosw);
698
inet6_sk_rebuild_header(struct sock * sk)699 int inet6_sk_rebuild_header(struct sock *sk)
700 {
701 struct ipv6_pinfo *np = inet6_sk(sk);
702 struct dst_entry *dst;
703
704 dst = __sk_dst_check(sk, np->dst_cookie);
705
706 if (!dst) {
707 struct inet_sock *inet = inet_sk(sk);
708 struct in6_addr *final_p, final;
709 struct flowi6 fl6;
710
711 memset(&fl6, 0, sizeof(fl6));
712 fl6.flowi6_proto = sk->sk_protocol;
713 fl6.daddr = sk->sk_v6_daddr;
714 fl6.saddr = np->saddr;
715 fl6.flowlabel = np->flow_label;
716 fl6.flowi6_oif = sk->sk_bound_dev_if;
717 fl6.flowi6_mark = sk->sk_mark;
718 fl6.fl6_dport = inet->inet_dport;
719 fl6.fl6_sport = inet->inet_sport;
720 fl6.flowi6_uid = sk->sk_uid;
721 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
722
723 rcu_read_lock();
724 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
725 &final);
726 rcu_read_unlock();
727
728 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
729 if (IS_ERR(dst)) {
730 sk->sk_route_caps = 0;
731 sk->sk_err_soft = -PTR_ERR(dst);
732 return PTR_ERR(dst);
733 }
734
735 ip6_dst_store(sk, dst, NULL, NULL);
736 }
737
738 return 0;
739 }
740 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
741
ipv6_opt_accepted(const struct sock * sk,const struct sk_buff * skb,const struct inet6_skb_parm * opt)742 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
743 const struct inet6_skb_parm *opt)
744 {
745 const struct ipv6_pinfo *np = inet6_sk(sk);
746
747 if (np->rxopt.all) {
748 if (((opt->flags & IP6SKB_HOPBYHOP) &&
749 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
750 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
751 np->rxopt.bits.rxflow) ||
752 (opt->srcrt && (np->rxopt.bits.srcrt ||
753 np->rxopt.bits.osrcrt)) ||
754 ((opt->dst1 || opt->dst0) &&
755 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
756 return true;
757 }
758 return false;
759 }
760 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
761
762 static struct packet_type ipv6_packet_type __read_mostly = {
763 .type = cpu_to_be16(ETH_P_IPV6),
764 .func = ipv6_rcv,
765 .list_func = ipv6_list_rcv,
766 };
767
ipv6_packet_init(void)768 static int __init ipv6_packet_init(void)
769 {
770 dev_add_pack(&ipv6_packet_type);
771 return 0;
772 }
773
ipv6_packet_cleanup(void)774 static void ipv6_packet_cleanup(void)
775 {
776 dev_remove_pack(&ipv6_packet_type);
777 }
778
ipv6_init_mibs(struct net * net)779 static int __net_init ipv6_init_mibs(struct net *net)
780 {
781 int i;
782
783 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
784 if (!net->mib.udp_stats_in6)
785 return -ENOMEM;
786 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
787 if (!net->mib.udplite_stats_in6)
788 goto err_udplite_mib;
789 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
790 if (!net->mib.ipv6_statistics)
791 goto err_ip_mib;
792
793 for_each_possible_cpu(i) {
794 struct ipstats_mib *af_inet6_stats;
795 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
796 u64_stats_init(&af_inet6_stats->syncp);
797 }
798
799
800 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
801 if (!net->mib.icmpv6_statistics)
802 goto err_icmp_mib;
803 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
804 GFP_KERNEL);
805 if (!net->mib.icmpv6msg_statistics)
806 goto err_icmpmsg_mib;
807 return 0;
808
809 err_icmpmsg_mib:
810 free_percpu(net->mib.icmpv6_statistics);
811 err_icmp_mib:
812 free_percpu(net->mib.ipv6_statistics);
813 err_ip_mib:
814 free_percpu(net->mib.udplite_stats_in6);
815 err_udplite_mib:
816 free_percpu(net->mib.udp_stats_in6);
817 return -ENOMEM;
818 }
819
ipv6_cleanup_mibs(struct net * net)820 static void ipv6_cleanup_mibs(struct net *net)
821 {
822 free_percpu(net->mib.udp_stats_in6);
823 free_percpu(net->mib.udplite_stats_in6);
824 free_percpu(net->mib.ipv6_statistics);
825 free_percpu(net->mib.icmpv6_statistics);
826 kfree(net->mib.icmpv6msg_statistics);
827 }
828
inet6_net_init(struct net * net)829 static int __net_init inet6_net_init(struct net *net)
830 {
831 int err = 0;
832
833 net->ipv6.sysctl.bindv6only = 0;
834 net->ipv6.sysctl.icmpv6_time = 1*HZ;
835 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
836 net->ipv6.sysctl.flowlabel_consistency = 1;
837 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
838 net->ipv6.sysctl.idgen_retries = 3;
839 net->ipv6.sysctl.idgen_delay = 1 * HZ;
840 net->ipv6.sysctl.flowlabel_state_ranges = 0;
841 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
842 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
843 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
844 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
845 atomic_set(&net->ipv6.fib6_sernum, 1);
846
847 err = ipv6_init_mibs(net);
848 if (err)
849 return err;
850 #ifdef CONFIG_PROC_FS
851 err = udp6_proc_init(net);
852 if (err)
853 goto out;
854 err = tcp6_proc_init(net);
855 if (err)
856 goto proc_tcp6_fail;
857 err = ac6_proc_init(net);
858 if (err)
859 goto proc_ac6_fail;
860 #endif
861 return err;
862
863 #ifdef CONFIG_PROC_FS
864 proc_ac6_fail:
865 tcp6_proc_exit(net);
866 proc_tcp6_fail:
867 udp6_proc_exit(net);
868 out:
869 ipv6_cleanup_mibs(net);
870 return err;
871 #endif
872 }
873
inet6_net_exit(struct net * net)874 static void __net_exit inet6_net_exit(struct net *net)
875 {
876 #ifdef CONFIG_PROC_FS
877 udp6_proc_exit(net);
878 tcp6_proc_exit(net);
879 ac6_proc_exit(net);
880 #endif
881 ipv6_cleanup_mibs(net);
882 }
883
884 static struct pernet_operations inet6_net_ops = {
885 .init = inet6_net_init,
886 .exit = inet6_net_exit,
887 };
888
889 static const struct ipv6_stub ipv6_stub_impl = {
890 .ipv6_sock_mc_join = ipv6_sock_mc_join,
891 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
892 .ipv6_dst_lookup = ip6_dst_lookup,
893 .fib6_get_table = fib6_get_table,
894 .fib6_table_lookup = fib6_table_lookup,
895 .fib6_lookup = fib6_lookup,
896 .fib6_multipath_select = fib6_multipath_select,
897 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
898 .udpv6_encap_enable = udpv6_encap_enable,
899 .ndisc_send_na = ndisc_send_na,
900 .nd_tbl = &nd_tbl,
901 };
902
903 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
904 .inet6_bind = __inet6_bind,
905 };
906
inet6_init(void)907 static int __init inet6_init(void)
908 {
909 struct list_head *r;
910 int err = 0;
911
912 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
913
914 /* Register the socket-side information for inet6_create. */
915 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
916 INIT_LIST_HEAD(r);
917
918 if (disable_ipv6_mod) {
919 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
920 goto out;
921 }
922
923 err = proto_register(&tcpv6_prot, 1);
924 if (err)
925 goto out;
926
927 err = proto_register(&udpv6_prot, 1);
928 if (err)
929 goto out_unregister_tcp_proto;
930
931 err = proto_register(&udplitev6_prot, 1);
932 if (err)
933 goto out_unregister_udp_proto;
934
935 err = proto_register(&rawv6_prot, 1);
936 if (err)
937 goto out_unregister_udplite_proto;
938
939 err = proto_register(&pingv6_prot, 1);
940 if (err)
941 goto out_unregister_raw_proto;
942
943 /* We MUST register RAW sockets before we create the ICMP6,
944 * IGMP6, or NDISC control sockets.
945 */
946 err = rawv6_init();
947 if (err)
948 goto out_unregister_ping_proto;
949
950 /* Register the family here so that the init calls below will
951 * be able to create sockets. (?? is this dangerous ??)
952 */
953 err = sock_register(&inet6_family_ops);
954 if (err)
955 goto out_sock_register_fail;
956
957 /*
958 * ipngwg API draft makes clear that the correct semantics
959 * for TCP and UDP is to consider one TCP and UDP instance
960 * in a host available by both INET and INET6 APIs and
961 * able to communicate via both network protocols.
962 */
963
964 err = register_pernet_subsys(&inet6_net_ops);
965 if (err)
966 goto register_pernet_fail;
967 err = ip6_mr_init();
968 if (err)
969 goto ipmr_fail;
970 err = icmpv6_init();
971 if (err)
972 goto icmp_fail;
973 err = ndisc_init();
974 if (err)
975 goto ndisc_fail;
976 err = igmp6_init();
977 if (err)
978 goto igmp_fail;
979
980 err = ipv6_netfilter_init();
981 if (err)
982 goto netfilter_fail;
983 /* Create /proc/foo6 entries. */
984 #ifdef CONFIG_PROC_FS
985 err = -ENOMEM;
986 if (raw6_proc_init())
987 goto proc_raw6_fail;
988 if (udplite6_proc_init())
989 goto proc_udplite6_fail;
990 if (ipv6_misc_proc_init())
991 goto proc_misc6_fail;
992 if (if6_proc_init())
993 goto proc_if6_fail;
994 #endif
995 err = ip6_route_init();
996 if (err)
997 goto ip6_route_fail;
998 err = ndisc_late_init();
999 if (err)
1000 goto ndisc_late_fail;
1001 err = ip6_flowlabel_init();
1002 if (err)
1003 goto ip6_flowlabel_fail;
1004 err = addrconf_init();
1005 if (err)
1006 goto addrconf_fail;
1007
1008 /* Init v6 extension headers. */
1009 err = ipv6_exthdrs_init();
1010 if (err)
1011 goto ipv6_exthdrs_fail;
1012
1013 err = ipv6_frag_init();
1014 if (err)
1015 goto ipv6_frag_fail;
1016
1017 /* Init v6 transport protocols. */
1018 err = udpv6_init();
1019 if (err)
1020 goto udpv6_fail;
1021
1022 err = udplitev6_init();
1023 if (err)
1024 goto udplitev6_fail;
1025
1026 err = udpv6_offload_init();
1027 if (err)
1028 goto udpv6_offload_fail;
1029
1030 err = tcpv6_init();
1031 if (err)
1032 goto tcpv6_fail;
1033
1034 err = ipv6_packet_init();
1035 if (err)
1036 goto ipv6_packet_fail;
1037
1038 err = pingv6_init();
1039 if (err)
1040 goto pingv6_fail;
1041
1042 err = calipso_init();
1043 if (err)
1044 goto calipso_fail;
1045
1046 err = seg6_init();
1047 if (err)
1048 goto seg6_fail;
1049
1050 err = igmp6_late_init();
1051 if (err)
1052 goto igmp6_late_err;
1053
1054 #ifdef CONFIG_SYSCTL
1055 err = ipv6_sysctl_register();
1056 if (err)
1057 goto sysctl_fail;
1058 #endif
1059
1060 /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1061 wmb();
1062 ipv6_stub = &ipv6_stub_impl;
1063 ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1064 out:
1065 return err;
1066
1067 #ifdef CONFIG_SYSCTL
1068 sysctl_fail:
1069 igmp6_late_cleanup();
1070 #endif
1071 igmp6_late_err:
1072 seg6_exit();
1073 seg6_fail:
1074 calipso_exit();
1075 calipso_fail:
1076 pingv6_exit();
1077 pingv6_fail:
1078 ipv6_packet_cleanup();
1079 ipv6_packet_fail:
1080 tcpv6_exit();
1081 tcpv6_fail:
1082 udpv6_offload_exit();
1083 udpv6_offload_fail:
1084 udplitev6_exit();
1085 udplitev6_fail:
1086 udpv6_exit();
1087 udpv6_fail:
1088 ipv6_frag_exit();
1089 ipv6_frag_fail:
1090 ipv6_exthdrs_exit();
1091 ipv6_exthdrs_fail:
1092 addrconf_cleanup();
1093 addrconf_fail:
1094 ip6_flowlabel_cleanup();
1095 ip6_flowlabel_fail:
1096 ndisc_late_cleanup();
1097 ndisc_late_fail:
1098 ip6_route_cleanup();
1099 ip6_route_fail:
1100 #ifdef CONFIG_PROC_FS
1101 if6_proc_exit();
1102 proc_if6_fail:
1103 ipv6_misc_proc_exit();
1104 proc_misc6_fail:
1105 udplite6_proc_exit();
1106 proc_udplite6_fail:
1107 raw6_proc_exit();
1108 proc_raw6_fail:
1109 #endif
1110 ipv6_netfilter_fini();
1111 netfilter_fail:
1112 igmp6_cleanup();
1113 igmp_fail:
1114 ndisc_cleanup();
1115 ndisc_fail:
1116 icmpv6_cleanup();
1117 icmp_fail:
1118 ip6_mr_cleanup();
1119 ipmr_fail:
1120 unregister_pernet_subsys(&inet6_net_ops);
1121 register_pernet_fail:
1122 sock_unregister(PF_INET6);
1123 rtnl_unregister_all(PF_INET6);
1124 out_sock_register_fail:
1125 rawv6_exit();
1126 out_unregister_ping_proto:
1127 proto_unregister(&pingv6_prot);
1128 out_unregister_raw_proto:
1129 proto_unregister(&rawv6_prot);
1130 out_unregister_udplite_proto:
1131 proto_unregister(&udplitev6_prot);
1132 out_unregister_udp_proto:
1133 proto_unregister(&udpv6_prot);
1134 out_unregister_tcp_proto:
1135 proto_unregister(&tcpv6_prot);
1136 goto out;
1137 }
1138 module_init(inet6_init);
1139
1140 MODULE_ALIAS_NETPROTO(PF_INET6);
1141
