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bus: mhi: core: Fix some error return code
[linux/fpc-iii.git] / net / ipv6 / af_inet6.c
blob345baa0a754f4bbb6d8967489fa1e6bc207e3aef
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * PF_INET6 socket protocol family
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Adapted from linux/net/ipv4/af_inet.c
10 *
11 * Fixes:
12 * piggy, Karl Knutson : Socket protocol table
13 * Hideaki YOSHIFUJI : sin6_scope_id support
14 * Arnaldo Melo : check proc_net_create return, cleanups
15 */
16
17 #define pr_fmt(fmt) "IPv6: " fmt
18
19 #include <linux/module.h>
20 #include <linux/capability.h>
21 #include <linux/errno.h>
22 #include <linux/types.h>
23 #include <linux/socket.h>
24 #include <linux/in.h>
25 #include <linux/kernel.h>
26 #include <linux/timer.h>
27 #include <linux/string.h>
28 #include <linux/sockios.h>
29 #include <linux/net.h>
30 #include <linux/fcntl.h>
31 #include <linux/mm.h>
32 #include <linux/interrupt.h>
33 #include <linux/proc_fs.h>
34 #include <linux/stat.h>
35 #include <linux/init.h>
36 #include <linux/slab.h>
37
38 #include <linux/inet.h>
39 #include <linux/netdevice.h>
40 #include <linux/icmpv6.h>
41 #include <linux/netfilter_ipv6.h>
42
43 #include <net/ip.h>
44 #include <net/ipv6.h>
45 #include <net/udp.h>
46 #include <net/udplite.h>
47 #include <net/tcp.h>
48 #include <net/ping.h>
49 #include <net/protocol.h>
50 #include <net/inet_common.h>
51 #include <net/route.h>
52 #include <net/transp_v6.h>
53 #include <net/ip6_route.h>
54 #include <net/addrconf.h>
55 #include <net/ipv6_stubs.h>
56 #include <net/ndisc.h>
57 #ifdef CONFIG_IPV6_TUNNEL
58 #include <net/ip6_tunnel.h>
59 #endif
60 #include <net/calipso.h>
61 #include <net/seg6.h>
62 #include <net/rpl.h>
63
64 #include <linux/uaccess.h>
65 #include <linux/mroute6.h>
66
67 #include "ip6_offload.h"
68
69 MODULE_AUTHOR("Cast of dozens");
70 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
71 MODULE_LICENSE("GPL");
72
73 /* The inetsw6 table contains everything that inet6_create needs to
74 * build a new socket.
75 */
76 static struct list_head inetsw6[SOCK_MAX];
77 static DEFINE_SPINLOCK(inetsw6_lock);
78
79 struct ipv6_params ipv6_defaults = {
80 .disable_ipv6 = 0,
81 .autoconf = 1,
82 };
83
84 static int disable_ipv6_mod;
85
86 module_param_named(disable, disable_ipv6_mod, int, 0444);
87 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
88
89 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
90 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
91
92 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
93 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
94
95 bool ipv6_mod_enabled(void)
96 {
97 return disable_ipv6_mod == 0;
98 }
99 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
100
101 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
102 {
103 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
104
105 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
106 }
107
108 static int inet6_create(struct net *net, struct socket *sock, int protocol,
109 int kern)
110 {
111 struct inet_sock *inet;
112 struct ipv6_pinfo *np;
113 struct sock *sk;
114 struct inet_protosw *answer;
115 struct proto *answer_prot;
116 unsigned char answer_flags;
117 int try_loading_module = 0;
118 int err;
119
120 if (protocol < 0 || protocol >= IPPROTO_MAX)
121 return -EINVAL;
122
123 /* Look for the requested type/protocol pair. */
124 lookup_protocol:
125 err = -ESOCKTNOSUPPORT;
126 rcu_read_lock();
127 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
128
129 err = 0;
130 /* Check the non-wild match. */
131 if (protocol == answer->protocol) {
132 if (protocol != IPPROTO_IP)
133 break;
134 } else {
135 /* Check for the two wild cases. */
136 if (IPPROTO_IP == protocol) {
137 protocol = answer->protocol;
138 break;
139 }
140 if (IPPROTO_IP == answer->protocol)
141 break;
142 }
143 err = -EPROTONOSUPPORT;
144 }
145
146 if (err) {
147 if (try_loading_module < 2) {
148 rcu_read_unlock();
149 /*
150 * Be more specific, e.g. net-pf-10-proto-132-type-1
151 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
152 */
153 if (++try_loading_module == 1)
154 request_module("net-pf-%d-proto-%d-type-%d",
155 PF_INET6, protocol, sock->type);
156 /*
157 * Fall back to generic, e.g. net-pf-10-proto-132
158 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
159 */
160 else
161 request_module("net-pf-%d-proto-%d",
162 PF_INET6, protocol);
163 goto lookup_protocol;
164 } else
165 goto out_rcu_unlock;
166 }
167
168 err = -EPERM;
169 if (sock->type == SOCK_RAW && !kern &&
170 !ns_capable(net->user_ns, CAP_NET_RAW))
171 goto out_rcu_unlock;
172
173 sock->ops = answer->ops;
174 answer_prot = answer->prot;
175 answer_flags = answer->flags;
176 rcu_read_unlock();
177
178 WARN_ON(!answer_prot->slab);
179
180 err = -ENOBUFS;
181 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
182 if (!sk)
183 goto out;
184
185 sock_init_data(sock, sk);
186
187 err = 0;
188 if (INET_PROTOSW_REUSE & answer_flags)
189 sk->sk_reuse = SK_CAN_REUSE;
190
191 inet = inet_sk(sk);
192 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
193
194 if (SOCK_RAW == sock->type) {
195 inet->inet_num = protocol;
196 if (IPPROTO_RAW == protocol)
197 inet->hdrincl = 1;
198 }
199
200 sk->sk_destruct = inet_sock_destruct;
201 sk->sk_family = PF_INET6;
202 sk->sk_protocol = protocol;
203
204 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
205
206 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
207 np->hop_limit = -1;
208 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
209 np->mc_loop = 1;
210 np->mc_all = 1;
211 np->pmtudisc = IPV6_PMTUDISC_WANT;
212 np->repflow = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
213 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
214
215 /* Init the ipv4 part of the socket since we can have sockets
216 * using v6 API for ipv4.
217 */
218 inet->uc_ttl = -1;
219
220 inet->mc_loop = 1;
221 inet->mc_ttl = 1;
222 inet->mc_index = 0;
223 inet->mc_list = NULL;
224 inet->rcv_tos = 0;
225
226 if (net->ipv4.sysctl_ip_no_pmtu_disc)
227 inet->pmtudisc = IP_PMTUDISC_DONT;
228 else
229 inet->pmtudisc = IP_PMTUDISC_WANT;
230 /*
231 * Increment only the relevant sk_prot->socks debug field, this changes
232 * the previous behaviour of incrementing both the equivalent to
233 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
234 *
235 * This allows better debug granularity as we'll know exactly how many
236 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
237 * transport protocol socks. -acme
238 */
239 sk_refcnt_debug_inc(sk);
240
241 if (inet->inet_num) {
242 /* It assumes that any protocol which allows
243 * the user to assign a number at socket
244 * creation time automatically shares.
245 */
246 inet->inet_sport = htons(inet->inet_num);
247 err = sk->sk_prot->hash(sk);
248 if (err) {
249 sk_common_release(sk);
250 goto out;
251 }
252 }
253 if (sk->sk_prot->init) {
254 err = sk->sk_prot->init(sk);
255 if (err) {
256 sk_common_release(sk);
257 goto out;
258 }
259 }
260
261 if (!kern) {
262 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
263 if (err) {
264 sk_common_release(sk);
265 goto out;
266 }
267 }
268 out:
269 return err;
270 out_rcu_unlock:
271 rcu_read_unlock();
272 goto out;
273 }
274
275 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
276 bool force_bind_address_no_port, bool with_lock)
277 {
278 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
279 struct inet_sock *inet = inet_sk(sk);
280 struct ipv6_pinfo *np = inet6_sk(sk);
281 struct net *net = sock_net(sk);
282 __be32 v4addr = 0;
283 unsigned short snum;
284 bool saved_ipv6only;
285 int addr_type = 0;
286 int err = 0;
287
288 if (addr->sin6_family != AF_INET6)
289 return -EAFNOSUPPORT;
290
291 addr_type = ipv6_addr_type(&addr->sin6_addr);
292 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
293 return -EINVAL;
294
295 snum = ntohs(addr->sin6_port);
296 if (snum && inet_port_requires_bind_service(net, snum) &&
297 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
298 return -EACCES;
299
300 if (with_lock)
301 lock_sock(sk);
302
303 /* Check these errors (active socket, double bind). */
304 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
305 err = -EINVAL;
306 goto out;
307 }
308
309 /* Check if the address belongs to the host. */
310 if (addr_type == IPV6_ADDR_MAPPED) {
311 struct net_device *dev = NULL;
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 rcu_read_lock();
323 if (sk->sk_bound_dev_if) {
324 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
325 if (!dev) {
326 err = -ENODEV;
327 goto out_unlock;
328 }
329 }
330
331 /* Reproduce AF_INET checks to make the bindings consistent */
332 v4addr = addr->sin6_addr.s6_addr32[3];
333 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
334 rcu_read_unlock();
335
336 if (!inet_can_nonlocal_bind(net, inet) &&
337 v4addr != htonl(INADDR_ANY) &&
338 chk_addr_ret != RTN_LOCAL &&
339 chk_addr_ret != RTN_MULTICAST &&
340 chk_addr_ret != RTN_BROADCAST) {
341 err = -EADDRNOTAVAIL;
342 goto out;
343 }
344 } else {
345 if (addr_type != IPV6_ADDR_ANY) {
346 struct net_device *dev = NULL;
347
348 rcu_read_lock();
349 if (__ipv6_addr_needs_scope_id(addr_type)) {
350 if (addr_len >= sizeof(struct sockaddr_in6) &&
351 addr->sin6_scope_id) {
352 /* Override any existing binding, if another one
353 * is supplied by user.
354 */
355 sk->sk_bound_dev_if = addr->sin6_scope_id;
356 }
357
358 /* Binding to link-local address requires an interface */
359 if (!sk->sk_bound_dev_if) {
360 err = -EINVAL;
361 goto out_unlock;
362 }
363 }
364
365 if (sk->sk_bound_dev_if) {
366 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
367 if (!dev) {
368 err = -ENODEV;
369 goto out_unlock;
370 }
371 }
372
373 /* ipv4 addr of the socket is invalid. Only the
374 * unspecified and mapped address have a v4 equivalent.
375 */
376 v4addr = LOOPBACK4_IPV6;
377 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
378 if (!ipv6_can_nonlocal_bind(net, inet) &&
379 !ipv6_chk_addr(net, &addr->sin6_addr,
380 dev, 0)) {
381 err = -EADDRNOTAVAIL;
382 goto out_unlock;
383 }
384 }
385 rcu_read_unlock();
386 }
387 }
388
389 inet->inet_rcv_saddr = v4addr;
390 inet->inet_saddr = v4addr;
391
392 sk->sk_v6_rcv_saddr = addr->sin6_addr;
393
394 if (!(addr_type & IPV6_ADDR_MULTICAST))
395 np->saddr = addr->sin6_addr;
396
397 saved_ipv6only = sk->sk_ipv6only;
398 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
399 sk->sk_ipv6only = 1;
400
401 /* Make sure we are allowed to bind here. */
402 if (snum || !(inet->bind_address_no_port ||
403 force_bind_address_no_port)) {
404 if (sk->sk_prot->get_port(sk, snum)) {
405 sk->sk_ipv6only = saved_ipv6only;
406 inet_reset_saddr(sk);
407 err = -EADDRINUSE;
408 goto out;
409 }
410 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
411 if (err) {
412 sk->sk_ipv6only = saved_ipv6only;
413 inet_reset_saddr(sk);
414 goto out;
415 }
416 }
417
418 if (addr_type != IPV6_ADDR_ANY)
419 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
420 if (snum)
421 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
422 inet->inet_sport = htons(inet->inet_num);
423 inet->inet_dport = 0;
424 inet->inet_daddr = 0;
425 out:
426 if (with_lock)
427 release_sock(sk);
428 return err;
429 out_unlock:
430 rcu_read_unlock();
431 goto out;
432 }
433
434 /* bind for INET6 API */
435 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
436 {
437 struct sock *sk = sock->sk;
438 int err = 0;
439
440 /* If the socket has its own bind function then use it. */
441 if (sk->sk_prot->bind)
442 return sk->sk_prot->bind(sk, uaddr, addr_len);
443
444 if (addr_len < SIN6_LEN_RFC2133)
445 return -EINVAL;
446
447 /* BPF prog is run before any checks are done so that if the prog
448 * changes context in a wrong way it will be caught.
449 */
450 err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr);
451 if (err)
452 return err;
453
454 return __inet6_bind(sk, uaddr, addr_len, false, true);
455 }
456 EXPORT_SYMBOL(inet6_bind);
457
458 int inet6_release(struct socket *sock)
459 {
460 struct sock *sk = sock->sk;
461
462 if (!sk)
463 return -EINVAL;
464
465 /* Free mc lists */
466 ipv6_sock_mc_close(sk);
467
468 /* Free ac lists */
469 ipv6_sock_ac_close(sk);
470
471 return inet_release(sock);
472 }
473 EXPORT_SYMBOL(inet6_release);
474
475 void inet6_destroy_sock(struct sock *sk)
476 {
477 struct ipv6_pinfo *np = inet6_sk(sk);
478 struct sk_buff *skb;
479 struct ipv6_txoptions *opt;
480
481 /* Release rx options */
482
483 skb = xchg(&np->pktoptions, NULL);
484 kfree_skb(skb);
485
486 skb = xchg(&np->rxpmtu, NULL);
487 kfree_skb(skb);
488
489 /* Free flowlabels */
490 fl6_free_socklist(sk);
491
492 /* Free tx options */
493
494 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
495 if (opt) {
496 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
497 txopt_put(opt);
498 }
499 }
500 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
501
502 /*
503 * This does both peername and sockname.
504 */
505
506 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
507 int peer)
508 {
509 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
510 struct sock *sk = sock->sk;
511 struct inet_sock *inet = inet_sk(sk);
512 struct ipv6_pinfo *np = inet6_sk(sk);
513
514 sin->sin6_family = AF_INET6;
515 sin->sin6_flowinfo = 0;
516 sin->sin6_scope_id = 0;
517 if (peer) {
518 if (!inet->inet_dport)
519 return -ENOTCONN;
520 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
521 peer == 1)
522 return -ENOTCONN;
523 sin->sin6_port = inet->inet_dport;
524 sin->sin6_addr = sk->sk_v6_daddr;
525 if (np->sndflow)
526 sin->sin6_flowinfo = np->flow_label;
527 } else {
528 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
529 sin->sin6_addr = np->saddr;
530 else
531 sin->sin6_addr = sk->sk_v6_rcv_saddr;
532
533 sin->sin6_port = inet->inet_sport;
534 }
535 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
536 sk->sk_bound_dev_if);
537 return sizeof(*sin);
538 }
539 EXPORT_SYMBOL(inet6_getname);
540
541 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
542 {
543 struct sock *sk = sock->sk;
544 struct net *net = sock_net(sk);
545
546 switch (cmd) {
547 case SIOCADDRT:
548 case SIOCDELRT:
549
550 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
551
552 case SIOCSIFADDR:
553 return addrconf_add_ifaddr(net, (void __user *) arg);
554 case SIOCDIFADDR:
555 return addrconf_del_ifaddr(net, (void __user *) arg);
556 case SIOCSIFDSTADDR:
557 return addrconf_set_dstaddr(net, (void __user *) arg);
558 default:
559 if (!sk->sk_prot->ioctl)
560 return -ENOIOCTLCMD;
561 return sk->sk_prot->ioctl(sk, cmd, arg);
562 }
563 /*NOTREACHED*/
564 return 0;
565 }
566 EXPORT_SYMBOL(inet6_ioctl);
567
568 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
569 size_t));
570 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
571 {
572 struct sock *sk = sock->sk;
573
574 if (unlikely(inet_send_prepare(sk)))
575 return -EAGAIN;
576
577 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
578 sk, msg, size);
579 }
580
581 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
582 size_t, int, int, int *));
583 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
584 int flags)
585 {
586 struct sock *sk = sock->sk;
587 int addr_len = 0;
588 int err;
589
590 if (likely(!(flags & MSG_ERRQUEUE)))
591 sock_rps_record_flow(sk);
592
593 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
594 sk, msg, size, flags & MSG_DONTWAIT,
595 flags & ~MSG_DONTWAIT, &addr_len);
596 if (err >= 0)
597 msg->msg_namelen = addr_len;
598 return err;
599 }
600
601 const struct proto_ops inet6_stream_ops = {
602 .family = PF_INET6,
603 .owner = THIS_MODULE,
604 .release = inet6_release,
605 .bind = inet6_bind,
606 .connect = inet_stream_connect, /* ok */
607 .socketpair = sock_no_socketpair, /* a do nothing */
608 .accept = inet_accept, /* ok */
609 .getname = inet6_getname,
610 .poll = tcp_poll, /* ok */
611 .ioctl = inet6_ioctl, /* must change */
612 .gettstamp = sock_gettstamp,
613 .listen = inet_listen, /* ok */
614 .shutdown = inet_shutdown, /* ok */
615 .setsockopt = sock_common_setsockopt, /* ok */
616 .getsockopt = sock_common_getsockopt, /* ok */
617 .sendmsg = inet6_sendmsg, /* retpoline's sake */
618 .recvmsg = inet6_recvmsg, /* retpoline's sake */
619 #ifdef CONFIG_MMU
620 .mmap = tcp_mmap,
621 #endif
622 .sendpage = inet_sendpage,
623 .sendmsg_locked = tcp_sendmsg_locked,
624 .sendpage_locked = tcp_sendpage_locked,
625 .splice_read = tcp_splice_read,
626 .read_sock = tcp_read_sock,
627 .peek_len = tcp_peek_len,
628 #ifdef CONFIG_COMPAT
629 .compat_setsockopt = compat_sock_common_setsockopt,
630 .compat_getsockopt = compat_sock_common_getsockopt,
631 #endif
632 .set_rcvlowat = tcp_set_rcvlowat,
633 };
634
635 const struct proto_ops inet6_dgram_ops = {
636 .family = PF_INET6,
637 .owner = THIS_MODULE,
638 .release = inet6_release,
639 .bind = inet6_bind,
640 .connect = inet_dgram_connect, /* ok */
641 .socketpair = sock_no_socketpair, /* a do nothing */
642 .accept = sock_no_accept, /* a do nothing */
643 .getname = inet6_getname,
644 .poll = udp_poll, /* ok */
645 .ioctl = inet6_ioctl, /* must change */
646 .gettstamp = sock_gettstamp,
647 .listen = sock_no_listen, /* ok */
648 .shutdown = inet_shutdown, /* ok */
649 .setsockopt = sock_common_setsockopt, /* ok */
650 .getsockopt = sock_common_getsockopt, /* ok */
651 .sendmsg = inet6_sendmsg, /* retpoline's sake */
652 .recvmsg = inet6_recvmsg, /* retpoline's sake */
653 .mmap = sock_no_mmap,
654 .sendpage = sock_no_sendpage,
655 .set_peek_off = sk_set_peek_off,
656 #ifdef CONFIG_COMPAT
657 .compat_setsockopt = compat_sock_common_setsockopt,
658 .compat_getsockopt = compat_sock_common_getsockopt,
659 #endif
660 };
661
662 static const struct net_proto_family inet6_family_ops = {
663 .family = PF_INET6,
664 .create = inet6_create,
665 .owner = THIS_MODULE,
666 };
667
668 int inet6_register_protosw(struct inet_protosw *p)
669 {
670 struct list_head *lh;
671 struct inet_protosw *answer;
672 struct list_head *last_perm;
673 int protocol = p->protocol;
674 int ret;
675
676 spin_lock_bh(&inetsw6_lock);
677
678 ret = -EINVAL;
679 if (p->type >= SOCK_MAX)
680 goto out_illegal;
681
682 /* If we are trying to override a permanent protocol, bail. */
683 answer = NULL;
684 ret = -EPERM;
685 last_perm = &inetsw6[p->type];
686 list_for_each(lh, &inetsw6[p->type]) {
687 answer = list_entry(lh, struct inet_protosw, list);
688
689 /* Check only the non-wild match. */
690 if (INET_PROTOSW_PERMANENT & answer->flags) {
691 if (protocol == answer->protocol)
692 break;
693 last_perm = lh;
694 }
695
696 answer = NULL;
697 }
698 if (answer)
699 goto out_permanent;
700
701 /* Add the new entry after the last permanent entry if any, so that
702 * the new entry does not override a permanent entry when matched with
703 * a wild-card protocol. But it is allowed to override any existing
704 * non-permanent entry. This means that when we remove this entry, the
705 * system automatically returns to the old behavior.
706 */
707 list_add_rcu(&p->list, last_perm);
708 ret = 0;
709 out:
710 spin_unlock_bh(&inetsw6_lock);
711 return ret;
712
713 out_permanent:
714 pr_err("Attempt to override permanent protocol %d\n", protocol);
715 goto out;
716
717 out_illegal:
718 pr_err("Ignoring attempt to register invalid socket type %d\n",
719 p->type);
720 goto out;
721 }
722 EXPORT_SYMBOL(inet6_register_protosw);
723
724 void
725 inet6_unregister_protosw(struct inet_protosw *p)
726 {
727 if (INET_PROTOSW_PERMANENT & p->flags) {
728 pr_err("Attempt to unregister permanent protocol %d\n",
729 p->protocol);
730 } else {
731 spin_lock_bh(&inetsw6_lock);
732 list_del_rcu(&p->list);
733 spin_unlock_bh(&inetsw6_lock);
734
735 synchronize_net();
736 }
737 }
738 EXPORT_SYMBOL(inet6_unregister_protosw);
739
740 int inet6_sk_rebuild_header(struct sock *sk)
741 {
742 struct ipv6_pinfo *np = inet6_sk(sk);
743 struct dst_entry *dst;
744
745 dst = __sk_dst_check(sk, np->dst_cookie);
746
747 if (!dst) {
748 struct inet_sock *inet = inet_sk(sk);
749 struct in6_addr *final_p, final;
750 struct flowi6 fl6;
751
752 memset(&fl6, 0, sizeof(fl6));
753 fl6.flowi6_proto = sk->sk_protocol;
754 fl6.daddr = sk->sk_v6_daddr;
755 fl6.saddr = np->saddr;
756 fl6.flowlabel = np->flow_label;
757 fl6.flowi6_oif = sk->sk_bound_dev_if;
758 fl6.flowi6_mark = sk->sk_mark;
759 fl6.fl6_dport = inet->inet_dport;
760 fl6.fl6_sport = inet->inet_sport;
761 fl6.flowi6_uid = sk->sk_uid;
762 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
763
764 rcu_read_lock();
765 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
766 &final);
767 rcu_read_unlock();
768
769 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
770 if (IS_ERR(dst)) {
771 sk->sk_route_caps = 0;
772 sk->sk_err_soft = -PTR_ERR(dst);
773 return PTR_ERR(dst);
774 }
775
776 ip6_dst_store(sk, dst, NULL, NULL);
777 }
778
779 return 0;
780 }
781 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
782
783 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
784 const struct inet6_skb_parm *opt)
785 {
786 const struct ipv6_pinfo *np = inet6_sk(sk);
787
788 if (np->rxopt.all) {
789 if (((opt->flags & IP6SKB_HOPBYHOP) &&
790 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
791 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
792 np->rxopt.bits.rxflow) ||
793 (opt->srcrt && (np->rxopt.bits.srcrt ||
794 np->rxopt.bits.osrcrt)) ||
795 ((opt->dst1 || opt->dst0) &&
796 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
797 return true;
798 }
799 return false;
800 }
801 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
802
803 static struct packet_type ipv6_packet_type __read_mostly = {
804 .type = cpu_to_be16(ETH_P_IPV6),
805 .func = ipv6_rcv,
806 .list_func = ipv6_list_rcv,
807 };
808
809 static int __init ipv6_packet_init(void)
810 {
811 dev_add_pack(&ipv6_packet_type);
812 return 0;
813 }
814
815 static void ipv6_packet_cleanup(void)
816 {
817 dev_remove_pack(&ipv6_packet_type);
818 }
819
820 static int __net_init ipv6_init_mibs(struct net *net)
821 {
822 int i;
823
824 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
825 if (!net->mib.udp_stats_in6)
826 return -ENOMEM;
827 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
828 if (!net->mib.udplite_stats_in6)
829 goto err_udplite_mib;
830 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
831 if (!net->mib.ipv6_statistics)
832 goto err_ip_mib;
833
834 for_each_possible_cpu(i) {
835 struct ipstats_mib *af_inet6_stats;
836 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
837 u64_stats_init(&af_inet6_stats->syncp);
838 }
839
840
841 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
842 if (!net->mib.icmpv6_statistics)
843 goto err_icmp_mib;
844 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
845 GFP_KERNEL);
846 if (!net->mib.icmpv6msg_statistics)
847 goto err_icmpmsg_mib;
848 return 0;
849
850 err_icmpmsg_mib:
851 free_percpu(net->mib.icmpv6_statistics);
852 err_icmp_mib:
853 free_percpu(net->mib.ipv6_statistics);
854 err_ip_mib:
855 free_percpu(net->mib.udplite_stats_in6);
856 err_udplite_mib:
857 free_percpu(net->mib.udp_stats_in6);
858 return -ENOMEM;
859 }
860
861 static void ipv6_cleanup_mibs(struct net *net)
862 {
863 free_percpu(net->mib.udp_stats_in6);
864 free_percpu(net->mib.udplite_stats_in6);
865 free_percpu(net->mib.ipv6_statistics);
866 free_percpu(net->mib.icmpv6_statistics);
867 kfree(net->mib.icmpv6msg_statistics);
868 }
869
870 static int __net_init inet6_net_init(struct net *net)
871 {
872 int err = 0;
873
874 net->ipv6.sysctl.bindv6only = 0;
875 net->ipv6.sysctl.icmpv6_time = 1*HZ;
876 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
877 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
878 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
879
880 /* By default, rate limit error messages.
881 * Except for pmtu discovery, it would break it.
882 * proc_do_large_bitmap needs pointer to the bitmap.
883 */
884 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
885 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
886 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
887
888 net->ipv6.sysctl.flowlabel_consistency = 1;
889 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
890 net->ipv6.sysctl.idgen_retries = 3;
891 net->ipv6.sysctl.idgen_delay = 1 * HZ;
892 net->ipv6.sysctl.flowlabel_state_ranges = 0;
893 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
894 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
895 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
896 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
897 atomic_set(&net->ipv6.fib6_sernum, 1);
898
899 err = ipv6_init_mibs(net);
900 if (err)
901 return err;
902 #ifdef CONFIG_PROC_FS
903 err = udp6_proc_init(net);
904 if (err)
905 goto out;
906 err = tcp6_proc_init(net);
907 if (err)
908 goto proc_tcp6_fail;
909 err = ac6_proc_init(net);
910 if (err)
911 goto proc_ac6_fail;
912 #endif
913 return err;
914
915 #ifdef CONFIG_PROC_FS
916 proc_ac6_fail:
917 tcp6_proc_exit(net);
918 proc_tcp6_fail:
919 udp6_proc_exit(net);
920 out:
921 ipv6_cleanup_mibs(net);
922 return err;
923 #endif
924 }
925
926 static void __net_exit inet6_net_exit(struct net *net)
927 {
928 #ifdef CONFIG_PROC_FS
929 udp6_proc_exit(net);
930 tcp6_proc_exit(net);
931 ac6_proc_exit(net);
932 #endif
933 ipv6_cleanup_mibs(net);
934 }
935
936 static struct pernet_operations inet6_net_ops = {
937 .init = inet6_net_init,
938 .exit = inet6_net_exit,
939 };
940
941 static int ipv6_route_input(struct sk_buff *skb)
942 {
943 ip6_route_input(skb);
944 return skb_dst(skb)->error;
945 }
946
947 static const struct ipv6_stub ipv6_stub_impl = {
948 .ipv6_sock_mc_join = ipv6_sock_mc_join,
949 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
950 .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
951 .ipv6_route_input = ipv6_route_input,
952 .fib6_get_table = fib6_get_table,
953 .fib6_table_lookup = fib6_table_lookup,
954 .fib6_lookup = fib6_lookup,
955 .fib6_select_path = fib6_select_path,
956 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
957 .fib6_nh_init = fib6_nh_init,
958 .fib6_nh_release = fib6_nh_release,
959 .fib6_update_sernum = fib6_update_sernum_stub,
960 .fib6_rt_update = fib6_rt_update,
961 .ip6_del_rt = ip6_del_rt,
962 .udpv6_encap_enable = udpv6_encap_enable,
963 .ndisc_send_na = ndisc_send_na,
964 .nd_tbl = &nd_tbl,
965 };
966
967 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
968 .inet6_bind = __inet6_bind,
969 .udp6_lib_lookup = __udp6_lib_lookup,
970 };
971
972 static int __init inet6_init(void)
973 {
974 struct list_head *r;
975 int err = 0;
976
977 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
978
979 /* Register the socket-side information for inet6_create. */
980 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
981 INIT_LIST_HEAD(r);
982
983 if (disable_ipv6_mod) {
984 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
985 goto out;
986 }
987
988 err = proto_register(&tcpv6_prot, 1);
989 if (err)
990 goto out;
991
992 err = proto_register(&udpv6_prot, 1);
993 if (err)
994 goto out_unregister_tcp_proto;
995
996 err = proto_register(&udplitev6_prot, 1);
997 if (err)
998 goto out_unregister_udp_proto;
999
1000 err = proto_register(&rawv6_prot, 1);
1001 if (err)
1002 goto out_unregister_udplite_proto;
1003
1004 err = proto_register(&pingv6_prot, 1);
1005 if (err)
1006 goto out_unregister_raw_proto;
1007
1008 /* We MUST register RAW sockets before we create the ICMP6,
1009 * IGMP6, or NDISC control sockets.
1010 */
1011 err = rawv6_init();
1012 if (err)
1013 goto out_unregister_ping_proto;
1014
1015 /* Register the family here so that the init calls below will
1016 * be able to create sockets. (?? is this dangerous ??)
1017 */
1018 err = sock_register(&inet6_family_ops);
1019 if (err)
1020 goto out_sock_register_fail;
1021
1022 /*
1023 * ipngwg API draft makes clear that the correct semantics
1024 * for TCP and UDP is to consider one TCP and UDP instance
1025 * in a host available by both INET and INET6 APIs and
1026 * able to communicate via both network protocols.
1027 */
1028
1029 err = register_pernet_subsys(&inet6_net_ops);
1030 if (err)
1031 goto register_pernet_fail;
1032 err = ip6_mr_init();
1033 if (err)
1034 goto ipmr_fail;
1035 err = icmpv6_init();
1036 if (err)
1037 goto icmp_fail;
1038 err = ndisc_init();
1039 if (err)
1040 goto ndisc_fail;
1041 err = igmp6_init();
1042 if (err)
1043 goto igmp_fail;
1044
1045 err = ipv6_netfilter_init();
1046 if (err)
1047 goto netfilter_fail;
1048 /* Create /proc/foo6 entries. */
1049 #ifdef CONFIG_PROC_FS
1050 err = -ENOMEM;
1051 if (raw6_proc_init())
1052 goto proc_raw6_fail;
1053 if (udplite6_proc_init())
1054 goto proc_udplite6_fail;
1055 if (ipv6_misc_proc_init())
1056 goto proc_misc6_fail;
1057 if (if6_proc_init())
1058 goto proc_if6_fail;
1059 #endif
1060 err = ip6_route_init();
1061 if (err)
1062 goto ip6_route_fail;
1063 err = ndisc_late_init();
1064 if (err)
1065 goto ndisc_late_fail;
1066 err = ip6_flowlabel_init();
1067 if (err)
1068 goto ip6_flowlabel_fail;
1069 err = ipv6_anycast_init();
1070 if (err)
1071 goto ipv6_anycast_fail;
1072 err = addrconf_init();
1073 if (err)
1074 goto addrconf_fail;
1075
1076 /* Init v6 extension headers. */
1077 err = ipv6_exthdrs_init();
1078 if (err)
1079 goto ipv6_exthdrs_fail;
1080
1081 err = ipv6_frag_init();
1082 if (err)
1083 goto ipv6_frag_fail;
1084
1085 /* Init v6 transport protocols. */
1086 err = udpv6_init();
1087 if (err)
1088 goto udpv6_fail;
1089
1090 err = udplitev6_init();
1091 if (err)
1092 goto udplitev6_fail;
1093
1094 err = udpv6_offload_init();
1095 if (err)
1096 goto udpv6_offload_fail;
1097
1098 err = tcpv6_init();
1099 if (err)
1100 goto tcpv6_fail;
1101
1102 err = ipv6_packet_init();
1103 if (err)
1104 goto ipv6_packet_fail;
1105
1106 err = pingv6_init();
1107 if (err)
1108 goto pingv6_fail;
1109
1110 err = calipso_init();
1111 if (err)
1112 goto calipso_fail;
1113
1114 err = seg6_init();
1115 if (err)
1116 goto seg6_fail;
1117
1118 err = rpl_init();
1119 if (err)
1120 goto rpl_fail;
1121
1122 err = igmp6_late_init();
1123 if (err)
1124 goto igmp6_late_err;
1125
1126 #ifdef CONFIG_SYSCTL
1127 err = ipv6_sysctl_register();
1128 if (err)
1129 goto sysctl_fail;
1130 #endif
1131
1132 /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1133 wmb();
1134 ipv6_stub = &ipv6_stub_impl;
1135 ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1136 out:
1137 return err;
1138
1139 #ifdef CONFIG_SYSCTL
1140 sysctl_fail:
1141 igmp6_late_cleanup();
1142 #endif
1143 igmp6_late_err:
1144 rpl_exit();
1145 rpl_fail:
1146 seg6_exit();
1147 seg6_fail:
1148 calipso_exit();
1149 calipso_fail:
1150 pingv6_exit();
1151 pingv6_fail:
1152 ipv6_packet_cleanup();
1153 ipv6_packet_fail:
1154 tcpv6_exit();
1155 tcpv6_fail:
1156 udpv6_offload_exit();
1157 udpv6_offload_fail:
1158 udplitev6_exit();
1159 udplitev6_fail:
1160 udpv6_exit();
1161 udpv6_fail:
1162 ipv6_frag_exit();
1163 ipv6_frag_fail:
1164 ipv6_exthdrs_exit();
1165 ipv6_exthdrs_fail:
1166 addrconf_cleanup();
1167 addrconf_fail:
1168 ipv6_anycast_cleanup();
1169 ipv6_anycast_fail:
1170 ip6_flowlabel_cleanup();
1171 ip6_flowlabel_fail:
1172 ndisc_late_cleanup();
1173 ndisc_late_fail:
1174 ip6_route_cleanup();
1175 ip6_route_fail:
1176 #ifdef CONFIG_PROC_FS
1177 if6_proc_exit();
1178 proc_if6_fail:
1179 ipv6_misc_proc_exit();
1180 proc_misc6_fail:
1181 udplite6_proc_exit();
1182 proc_udplite6_fail:
1183 raw6_proc_exit();
1184 proc_raw6_fail:
1185 #endif
1186 ipv6_netfilter_fini();
1187 netfilter_fail:
1188 igmp6_cleanup();
1189 igmp_fail:
1190 ndisc_cleanup();
1191 ndisc_fail:
1192 icmpv6_cleanup();
1193 icmp_fail:
1194 ip6_mr_cleanup();
1195 ipmr_fail:
1196 unregister_pernet_subsys(&inet6_net_ops);
1197 register_pernet_fail:
1198 sock_unregister(PF_INET6);
1199 rtnl_unregister_all(PF_INET6);
1200 out_sock_register_fail:
1201 rawv6_exit();
1202 out_unregister_ping_proto:
1203 proto_unregister(&pingv6_prot);
1204 out_unregister_raw_proto:
1205 proto_unregister(&rawv6_prot);
1206 out_unregister_udplite_proto:
1207 proto_unregister(&udplitev6_prot);
1208 out_unregister_udp_proto:
1209 proto_unregister(&udpv6_prot);
1210 out_unregister_tcp_proto:
1211 proto_unregister(&tcpv6_prot);
1212 goto out;
1213 }
1214 module_init(inet6_init);
1215
1216 MODULE_ALIAS_NETPROTO(PF_INET6);
Linux with added FPC-III support