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1/*
2 * PF_INET6 socket protocol family
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Adapted from linux/net/ipv4/af_inet.c
9 *
10 * Fixes:
11 * piggy, Karl Knutson : Socket protocol table
12 * Hideaki YOSHIFUJI : sin6_scope_id support
13 * Arnaldo Melo : check proc_net_create return, cleanups
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 */
20
21
22#include <linux/module.h>
23#include <linux/capability.h>
24#include <linux/errno.h>
25#include <linux/types.h>
26#include <linux/socket.h>
27#include <linux/in.h>
28#include <linux/kernel.h>
29#include <linux/timer.h>
30#include <linux/string.h>
31#include <linux/sockios.h>
32#include <linux/net.h>
33#include <linux/fcntl.h>
34#include <linux/mm.h>
35#include <linux/interrupt.h>
36#include <linux/proc_fs.h>
37#include <linux/stat.h>
38#include <linux/init.h>
39#include <linux/slab.h>
40
41#include <linux/inet.h>
42#include <linux/netdevice.h>
43#include <linux/icmpv6.h>
44#include <linux/netfilter_ipv6.h>
45
46#include <net/ip.h>
47#include <net/ipv6.h>
48#include <net/udp.h>
49#include <net/udplite.h>
50#include <net/tcp.h>
51#include <net/ipip.h>
52#include <net/protocol.h>
53#include <net/inet_common.h>
54#include <net/route.h>
55#include <net/transp_v6.h>
56#include <net/ip6_route.h>
57#include <net/addrconf.h>
58#ifdef CONFIG_IPV6_TUNNEL
59#include <net/ip6_tunnel.h>
60#endif
61
62#include <asm/uaccess.h>
63#include <asm/system.h>
64#include <linux/mroute6.h>
65
66MODULE_AUTHOR("Cast of dozens");
67MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
68MODULE_LICENSE("GPL");
69
70/* The inetsw6 table contains everything that inet6_create needs to
71 * build a new socket.
72 */
73static struct list_head inetsw6[SOCK_MAX];
74static DEFINE_SPINLOCK(inetsw6_lock);
75
76struct ipv6_params ipv6_defaults = {
77 .disable_ipv6 = 0,
78 .autoconf = 1,
79};
80
81static int disable_ipv6_mod = 0;
82
83module_param_named(disable, disable_ipv6_mod, int, 0444);
84MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
85
86module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
87MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
88
89module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
90MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
91
92static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
93{
94 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
95
96 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
97}
98
99static int inet6_create(struct net *net, struct socket *sock, int protocol,
100 int kern)
101{
102 struct inet_sock *inet;
103 struct ipv6_pinfo *np;
104 struct sock *sk;
105 struct inet_protosw *answer;
106 struct proto *answer_prot;
107 unsigned char answer_flags;
108 char answer_no_check;
109 int try_loading_module = 0;
110 int err;
111
112 if (sock->type != SOCK_RAW &&
113 sock->type != SOCK_DGRAM &&
114 !inet_ehash_secret)
115 build_ehash_secret();
116
117 /* Look for the requested type/protocol pair. */
118lookup_protocol:
119 err = -ESOCKTNOSUPPORT;
120 rcu_read_lock();
121 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
122
123 err = 0;
124 /* Check the non-wild match. */
125 if (protocol == answer->protocol) {
126 if (protocol != IPPROTO_IP)
127 break;
128 } else {
129 /* Check for the two wild cases. */
130 if (IPPROTO_IP == protocol) {
131 protocol = answer->protocol;
132 break;
133 }
134 if (IPPROTO_IP == answer->protocol)
135 break;
136 }
137 err = -EPROTONOSUPPORT;
138 }
139
140 if (err) {
141 if (try_loading_module < 2) {
142 rcu_read_unlock();
143 /*
144 * Be more specific, e.g. net-pf-10-proto-132-type-1
145 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
146 */
147 if (++try_loading_module == 1)
148 request_module("net-pf-%d-proto-%d-type-%d",
149 PF_INET6, protocol, sock->type);
150 /*
151 * Fall back to generic, e.g. net-pf-10-proto-132
152 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
153 */
154 else
155 request_module("net-pf-%d-proto-%d",
156 PF_INET6, protocol);
157 goto lookup_protocol;
158 } else
159 goto out_rcu_unlock;
160 }
161
162 err = -EPERM;
163 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
164 goto out_rcu_unlock;
165
166 sock->ops = answer->ops;
167 answer_prot = answer->prot;
168 answer_no_check = answer->no_check;
169 answer_flags = answer->flags;
170 rcu_read_unlock();
171
172 WARN_ON(answer_prot->slab == NULL);
173
174 err = -ENOBUFS;
175 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
176 if (sk == NULL)
177 goto out;
178
179 sock_init_data(sock, sk);
180
181 err = 0;
182 sk->sk_no_check = answer_no_check;
183 if (INET_PROTOSW_REUSE & answer_flags)
184 sk->sk_reuse = 1;
185
186 inet = inet_sk(sk);
187 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
188
189 if (SOCK_RAW == sock->type) {
190 inet->inet_num = protocol;
191 if (IPPROTO_RAW == protocol)
192 inet->hdrincl = 1;
193 }
194
195 sk->sk_destruct = inet_sock_destruct;
196 sk->sk_family = PF_INET6;
197 sk->sk_protocol = protocol;
198
199 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
200
201 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
202 np->hop_limit = -1;
203 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
204 np->mc_loop = 1;
205 np->pmtudisc = IPV6_PMTUDISC_WANT;
206 np->ipv6only = net->ipv6.sysctl.bindv6only;
207
208 /* Init the ipv4 part of the socket since we can have sockets
209 * using v6 API for ipv4.
210 */
211 inet->uc_ttl = -1;
212
213 inet->mc_loop = 1;
214 inet->mc_ttl = 1;
215 inet->mc_index = 0;
216 inet->mc_list = NULL;
217
218 if (ipv4_config.no_pmtu_disc)
219 inet->pmtudisc = IP_PMTUDISC_DONT;
220 else
221 inet->pmtudisc = IP_PMTUDISC_WANT;
222 /*
223 * Increment only the relevant sk_prot->socks debug field, this changes
224 * the previous behaviour of incrementing both the equivalent to
225 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
226 *
227 * This allows better debug granularity as we'll know exactly how many
228 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
229 * transport protocol socks. -acme
230 */
231 sk_refcnt_debug_inc(sk);
232
233 if (inet->inet_num) {
234 /* It assumes that any protocol which allows
235 * the user to assign a number at socket
236 * creation time automatically shares.
237 */
238 inet->inet_sport = htons(inet->inet_num);
239 sk->sk_prot->hash(sk);
240 }
241 if (sk->sk_prot->init) {
242 err = sk->sk_prot->init(sk);
243 if (err) {
244 sk_common_release(sk);
245 goto out;
246 }
247 }
248out:
249 return err;
250out_rcu_unlock:
251 rcu_read_unlock();
252 goto out;
253}
254
255
256/* bind for INET6 API */
257int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
258{
259 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
260 struct sock *sk = sock->sk;
261 struct inet_sock *inet = inet_sk(sk);
262 struct ipv6_pinfo *np = inet6_sk(sk);
263 struct net *net = sock_net(sk);
264 __be32 v4addr = 0;
265 unsigned short snum;
266 int addr_type = 0;
267 int err = 0;
268
269 /* If the socket has its own bind function then use it. */
270 if (sk->sk_prot->bind)
271 return sk->sk_prot->bind(sk, uaddr, addr_len);
272
273 if (addr_len < SIN6_LEN_RFC2133)
274 return -EINVAL;
275
276 if (addr->sin6_family != AF_INET6)
277 return -EAFNOSUPPORT;
278
279 addr_type = ipv6_addr_type(&addr->sin6_addr);
280 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
281 return -EINVAL;
282
283 snum = ntohs(addr->sin6_port);
284 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
285 return -EACCES;
286
287 lock_sock(sk);
288
289 /* Check these errors (active socket, double bind). */
290 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
291 err = -EINVAL;
292 goto out;
293 }
294
295 /* Check if the address belongs to the host. */
296 if (addr_type == IPV6_ADDR_MAPPED) {
297 int chk_addr_ret;
298
299 /* Binding to v4-mapped address on a v6-only socket
300 * makes no sense
301 */
302 if (np->ipv6only) {
303 err = -EINVAL;
304 goto out;
305 }
306
307 /* Reproduce AF_INET checks to make the bindings consistent */
308 v4addr = addr->sin6_addr.s6_addr32[3];
309 chk_addr_ret = inet_addr_type(net, v4addr);
310 if (!sysctl_ip_nonlocal_bind &&
311 !(inet->freebind || inet->transparent) &&
312 v4addr != htonl(INADDR_ANY) &&
313 chk_addr_ret != RTN_LOCAL &&
314 chk_addr_ret != RTN_MULTICAST &&
315 chk_addr_ret != RTN_BROADCAST) {
316 err = -EADDRNOTAVAIL;
317 goto out;
318 }
319 } else {
320 if (addr_type != IPV6_ADDR_ANY) {
321 struct net_device *dev = NULL;
322
323 rcu_read_lock();
324 if (addr_type & IPV6_ADDR_LINKLOCAL) {
325 if (addr_len >= sizeof(struct sockaddr_in6) &&
326 addr->sin6_scope_id) {
327 /* Override any existing binding, if another one
328 * is supplied by user.
329 */
330 sk->sk_bound_dev_if = addr->sin6_scope_id;
331 }
332
333 /* Binding to link-local address requires an interface */
334 if (!sk->sk_bound_dev_if) {
335 err = -EINVAL;
336 goto out_unlock;
337 }
338 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
339 if (!dev) {
340 err = -ENODEV;
341 goto out_unlock;
342 }
343 }
344
345 /* ipv4 addr of the socket is invalid. Only the
346 * unspecified and mapped address have a v4 equivalent.
347 */
348 v4addr = LOOPBACK4_IPV6;
349 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
350 if (!inet->transparent &&
351 !ipv6_chk_addr(net, &addr->sin6_addr,
352 dev, 0)) {
353 err = -EADDRNOTAVAIL;
354 goto out_unlock;
355 }
356 }
357 rcu_read_unlock();
358 }
359 }
360
361 inet->inet_rcv_saddr = v4addr;
362 inet->inet_saddr = v4addr;
363
364 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
365
366 if (!(addr_type & IPV6_ADDR_MULTICAST))
367 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
368
369 /* Make sure we are allowed to bind here. */
370 if (sk->sk_prot->get_port(sk, snum)) {
371 inet_reset_saddr(sk);
372 err = -EADDRINUSE;
373 goto out;
374 }
375
376 if (addr_type != IPV6_ADDR_ANY) {
377 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
378 if (addr_type != IPV6_ADDR_MAPPED)
379 np->ipv6only = 1;
380 }
381 if (snum)
382 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
383 inet->inet_sport = htons(inet->inet_num);
384 inet->inet_dport = 0;
385 inet->inet_daddr = 0;
386out:
387 release_sock(sk);
388 return err;
389out_unlock:
390 rcu_read_unlock();
391 goto out;
392}
393
394EXPORT_SYMBOL(inet6_bind);
395
396int inet6_release(struct socket *sock)
397{
398 struct sock *sk = sock->sk;
399
400 if (sk == NULL)
401 return -EINVAL;
402
403 /* Free mc lists */
404 ipv6_sock_mc_close(sk);
405
406 /* Free ac lists */
407 ipv6_sock_ac_close(sk);
408
409 return inet_release(sock);
410}
411
412EXPORT_SYMBOL(inet6_release);
413
414void inet6_destroy_sock(struct sock *sk)
415{
416 struct ipv6_pinfo *np = inet6_sk(sk);
417 struct sk_buff *skb;
418 struct ipv6_txoptions *opt;
419
420 /* Release rx options */
421
422 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
423 kfree_skb(skb);
424
425 if ((skb = xchg(&np->rxpmtu, NULL)) != NULL)
426 kfree_skb(skb);
427
428 /* Free flowlabels */
429 fl6_free_socklist(sk);
430
431 /* Free tx options */
432
433 if ((opt = xchg(&np->opt, NULL)) != NULL)
434 sock_kfree_s(sk, opt, opt->tot_len);
435}
436
437EXPORT_SYMBOL_GPL(inet6_destroy_sock);
438
439/*
440 * This does both peername and sockname.
441 */
442
443int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
444 int *uaddr_len, int peer)
445{
446 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
447 struct sock *sk = sock->sk;
448 struct inet_sock *inet = inet_sk(sk);
449 struct ipv6_pinfo *np = inet6_sk(sk);
450
451 sin->sin6_family = AF_INET6;
452 sin->sin6_flowinfo = 0;
453 sin->sin6_scope_id = 0;
454 if (peer) {
455 if (!inet->inet_dport)
456 return -ENOTCONN;
457 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
458 peer == 1)
459 return -ENOTCONN;
460 sin->sin6_port = inet->inet_dport;
461 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
462 if (np->sndflow)
463 sin->sin6_flowinfo = np->flow_label;
464 } else {
465 if (ipv6_addr_any(&np->rcv_saddr))
466 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
467 else
468 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
469
470 sin->sin6_port = inet->inet_sport;
471 }
472 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
473 sin->sin6_scope_id = sk->sk_bound_dev_if;
474 *uaddr_len = sizeof(*sin);
475 return 0;
476}
477
478EXPORT_SYMBOL(inet6_getname);
479
480int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
481{
482 struct sock *sk = sock->sk;
483 struct net *net = sock_net(sk);
484
485 switch(cmd)
486 {
487 case SIOCGSTAMP:
488 return sock_get_timestamp(sk, (struct timeval __user *)arg);
489
490 case SIOCGSTAMPNS:
491 return sock_get_timestampns(sk, (struct timespec __user *)arg);
492
493 case SIOCADDRT:
494 case SIOCDELRT:
495
496 return ipv6_route_ioctl(net, cmd, (void __user *)arg);
497
498 case SIOCSIFADDR:
499 return addrconf_add_ifaddr(net, (void __user *) arg);
500 case SIOCDIFADDR:
501 return addrconf_del_ifaddr(net, (void __user *) arg);
502 case SIOCSIFDSTADDR:
503 return addrconf_set_dstaddr(net, (void __user *) arg);
504 default:
505 if (!sk->sk_prot->ioctl)
506 return -ENOIOCTLCMD;
507 return sk->sk_prot->ioctl(sk, cmd, arg);
508 }
509 /*NOTREACHED*/
510 return 0;
511}
512
513EXPORT_SYMBOL(inet6_ioctl);
514
515const struct proto_ops inet6_stream_ops = {
516 .family = PF_INET6,
517 .owner = THIS_MODULE,
518 .release = inet6_release,
519 .bind = inet6_bind,
520 .connect = inet_stream_connect, /* ok */
521 .socketpair = sock_no_socketpair, /* a do nothing */
522 .accept = inet_accept, /* ok */
523 .getname = inet6_getname,
524 .poll = tcp_poll, /* ok */
525 .ioctl = inet6_ioctl, /* must change */
526 .listen = inet_listen, /* ok */
527 .shutdown = inet_shutdown, /* ok */
528 .setsockopt = sock_common_setsockopt, /* ok */
529 .getsockopt = sock_common_getsockopt, /* ok */
530 .sendmsg = inet_sendmsg, /* ok */
531 .recvmsg = inet_recvmsg, /* ok */
532 .mmap = sock_no_mmap,
533 .sendpage = inet_sendpage,
534 .splice_read = tcp_splice_read,
535#ifdef CONFIG_COMPAT
536 .compat_setsockopt = compat_sock_common_setsockopt,
537 .compat_getsockopt = compat_sock_common_getsockopt,
538#endif
539};
540
541const struct proto_ops inet6_dgram_ops = {
542 .family = PF_INET6,
543 .owner = THIS_MODULE,
544 .release = inet6_release,
545 .bind = inet6_bind,
546 .connect = inet_dgram_connect, /* ok */
547 .socketpair = sock_no_socketpair, /* a do nothing */
548 .accept = sock_no_accept, /* a do nothing */
549 .getname = inet6_getname,
550 .poll = udp_poll, /* ok */
551 .ioctl = inet6_ioctl, /* must change */
552 .listen = sock_no_listen, /* ok */
553 .shutdown = inet_shutdown, /* ok */
554 .setsockopt = sock_common_setsockopt, /* ok */
555 .getsockopt = sock_common_getsockopt, /* ok */
556 .sendmsg = inet_sendmsg, /* ok */
557 .recvmsg = inet_recvmsg, /* ok */
558 .mmap = sock_no_mmap,
559 .sendpage = sock_no_sendpage,
560#ifdef CONFIG_COMPAT
561 .compat_setsockopt = compat_sock_common_setsockopt,
562 .compat_getsockopt = compat_sock_common_getsockopt,
563#endif
564};
565
566static const struct net_proto_family inet6_family_ops = {
567 .family = PF_INET6,
568 .create = inet6_create,
569 .owner = THIS_MODULE,
570};
571
572int inet6_register_protosw(struct inet_protosw *p)
573{
574 struct list_head *lh;
575 struct inet_protosw *answer;
576 struct list_head *last_perm;
577 int protocol = p->protocol;
578 int ret;
579
580 spin_lock_bh(&inetsw6_lock);
581
582 ret = -EINVAL;
583 if (p->type >= SOCK_MAX)
584 goto out_illegal;
585
586 /* If we are trying to override a permanent protocol, bail. */
587 answer = NULL;
588 ret = -EPERM;
589 last_perm = &inetsw6[p->type];
590 list_for_each(lh, &inetsw6[p->type]) {
591 answer = list_entry(lh, struct inet_protosw, list);
592
593 /* Check only the non-wild match. */
594 if (INET_PROTOSW_PERMANENT & answer->flags) {
595 if (protocol == answer->protocol)
596 break;
597 last_perm = lh;
598 }
599
600 answer = NULL;
601 }
602 if (answer)
603 goto out_permanent;
604
605 /* Add the new entry after the last permanent entry if any, so that
606 * the new entry does not override a permanent entry when matched with
607 * a wild-card protocol. But it is allowed to override any existing
608 * non-permanent entry. This means that when we remove this entry, the
609 * system automatically returns to the old behavior.
610 */
611 list_add_rcu(&p->list, last_perm);
612 ret = 0;
613out:
614 spin_unlock_bh(&inetsw6_lock);
615 return ret;
616
617out_permanent:
618 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
619 protocol);
620 goto out;
621
622out_illegal:
623 printk(KERN_ERR
624 "Ignoring attempt to register invalid socket type %d.\n",
625 p->type);
626 goto out;
627}
628
629EXPORT_SYMBOL(inet6_register_protosw);
630
631void
632inet6_unregister_protosw(struct inet_protosw *p)
633{
634 if (INET_PROTOSW_PERMANENT & p->flags) {
635 printk(KERN_ERR
636 "Attempt to unregister permanent protocol %d.\n",
637 p->protocol);
638 } else {
639 spin_lock_bh(&inetsw6_lock);
640 list_del_rcu(&p->list);
641 spin_unlock_bh(&inetsw6_lock);
642
643 synchronize_net();
644 }
645}
646
647EXPORT_SYMBOL(inet6_unregister_protosw);
648
649int inet6_sk_rebuild_header(struct sock *sk)
650{
651 struct ipv6_pinfo *np = inet6_sk(sk);
652 struct dst_entry *dst;
653
654 dst = __sk_dst_check(sk, np->dst_cookie);
655
656 if (dst == NULL) {
657 struct inet_sock *inet = inet_sk(sk);
658 struct in6_addr *final_p, final;
659 struct flowi6 fl6;
660
661 memset(&fl6, 0, sizeof(fl6));
662 fl6.flowi6_proto = sk->sk_protocol;
663 ipv6_addr_copy(&fl6.daddr, &np->daddr);
664 ipv6_addr_copy(&fl6.saddr, &np->saddr);
665 fl6.flowlabel = np->flow_label;
666 fl6.flowi6_oif = sk->sk_bound_dev_if;
667 fl6.flowi6_mark = sk->sk_mark;
668 fl6.fl6_dport = inet->inet_dport;
669 fl6.fl6_sport = inet->inet_sport;
670 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
671
672 final_p = fl6_update_dst(&fl6, np->opt, &final);
673
674 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
675 if (IS_ERR(dst)) {
676 sk->sk_route_caps = 0;
677 sk->sk_err_soft = -PTR_ERR(dst);
678 return PTR_ERR(dst);
679 }
680
681 __ip6_dst_store(sk, dst, NULL, NULL);
682 }
683
684 return 0;
685}
686
687EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
688
689int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
690{
691 struct ipv6_pinfo *np = inet6_sk(sk);
692 struct inet6_skb_parm *opt = IP6CB(skb);
693
694 if (np->rxopt.all) {
695 if ((opt->hop && (np->rxopt.bits.hopopts ||
696 np->rxopt.bits.ohopopts)) ||
697 ((IPV6_FLOWINFO_MASK &
698 *(__be32 *)skb_network_header(skb)) &&
699 np->rxopt.bits.rxflow) ||
700 (opt->srcrt && (np->rxopt.bits.srcrt ||
701 np->rxopt.bits.osrcrt)) ||
702 ((opt->dst1 || opt->dst0) &&
703 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
704 return 1;
705 }
706 return 0;
707}
708
709EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
710
711static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
712{
713 const struct inet6_protocol *ops = NULL;
714
715 for (;;) {
716 struct ipv6_opt_hdr *opth;
717 int len;
718
719 if (proto != NEXTHDR_HOP) {
720 ops = rcu_dereference(inet6_protos[proto]);
721
722 if (unlikely(!ops))
723 break;
724
725 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
726 break;
727 }
728
729 if (unlikely(!pskb_may_pull(skb, 8)))
730 break;
731
732 opth = (void *)skb->data;
733 len = ipv6_optlen(opth);
734
735 if (unlikely(!pskb_may_pull(skb, len)))
736 break;
737
738 proto = opth->nexthdr;
739 __skb_pull(skb, len);
740 }
741
742 return proto;
743}
744
745static int ipv6_gso_send_check(struct sk_buff *skb)
746{
747 const struct ipv6hdr *ipv6h;
748 const struct inet6_protocol *ops;
749 int err = -EINVAL;
750
751 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
752 goto out;
753
754 ipv6h = ipv6_hdr(skb);
755 __skb_pull(skb, sizeof(*ipv6h));
756 err = -EPROTONOSUPPORT;
757
758 rcu_read_lock();
759 ops = rcu_dereference(inet6_protos[
760 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
761
762 if (likely(ops && ops->gso_send_check)) {
763 skb_reset_transport_header(skb);
764 err = ops->gso_send_check(skb);
765 }
766 rcu_read_unlock();
767
768out:
769 return err;
770}
771
772static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, u32 features)
773{
774 struct sk_buff *segs = ERR_PTR(-EINVAL);
775 struct ipv6hdr *ipv6h;
776 const struct inet6_protocol *ops;
777 int proto;
778 struct frag_hdr *fptr;
779 unsigned int unfrag_ip6hlen;
780 u8 *prevhdr;
781 int offset = 0;
782
783 if (!(features & NETIF_F_V6_CSUM))
784 features &= ~NETIF_F_SG;
785
786 if (unlikely(skb_shinfo(skb)->gso_type &
787 ~(SKB_GSO_UDP |
788 SKB_GSO_DODGY |
789 SKB_GSO_TCP_ECN |
790 SKB_GSO_TCPV6 |
791 0)))
792 goto out;
793
794 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
795 goto out;
796
797 ipv6h = ipv6_hdr(skb);
798 __skb_pull(skb, sizeof(*ipv6h));
799 segs = ERR_PTR(-EPROTONOSUPPORT);
800
801 proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
802 rcu_read_lock();
803 ops = rcu_dereference(inet6_protos[proto]);
804 if (likely(ops && ops->gso_segment)) {
805 skb_reset_transport_header(skb);
806 segs = ops->gso_segment(skb, features);
807 }
808 rcu_read_unlock();
809
810 if (IS_ERR(segs))
811 goto out;
812
813 for (skb = segs; skb; skb = skb->next) {
814 ipv6h = ipv6_hdr(skb);
815 ipv6h->payload_len = htons(skb->len - skb->mac_len -
816 sizeof(*ipv6h));
817 if (proto == IPPROTO_UDP) {
818 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
819 fptr = (struct frag_hdr *)(skb_network_header(skb) +
820 unfrag_ip6hlen);
821 fptr->frag_off = htons(offset);
822 if (skb->next != NULL)
823 fptr->frag_off |= htons(IP6_MF);
824 offset += (ntohs(ipv6h->payload_len) -
825 sizeof(struct frag_hdr));
826 }
827 }
828
829out:
830 return segs;
831}
832
833struct ipv6_gro_cb {
834 struct napi_gro_cb napi;
835 int proto;
836};
837
838#define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
839
840static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
841 struct sk_buff *skb)
842{
843 const struct inet6_protocol *ops;
844 struct sk_buff **pp = NULL;
845 struct sk_buff *p;
846 struct ipv6hdr *iph;
847 unsigned int nlen;
848 unsigned int hlen;
849 unsigned int off;
850 int flush = 1;
851 int proto;
852 __wsum csum;
853
854 off = skb_gro_offset(skb);
855 hlen = off + sizeof(*iph);
856 iph = skb_gro_header_fast(skb, off);
857 if (skb_gro_header_hard(skb, hlen)) {
858 iph = skb_gro_header_slow(skb, hlen, off);
859 if (unlikely(!iph))
860 goto out;
861 }
862
863 skb_gro_pull(skb, sizeof(*iph));
864 skb_set_transport_header(skb, skb_gro_offset(skb));
865
866 flush += ntohs(iph->payload_len) != skb_gro_len(skb);
867
868 rcu_read_lock();
869 proto = iph->nexthdr;
870 ops = rcu_dereference(inet6_protos[proto]);
871 if (!ops || !ops->gro_receive) {
872 __pskb_pull(skb, skb_gro_offset(skb));
873 proto = ipv6_gso_pull_exthdrs(skb, proto);
874 skb_gro_pull(skb, -skb_transport_offset(skb));
875 skb_reset_transport_header(skb);
876 __skb_push(skb, skb_gro_offset(skb));
877
878 ops = rcu_dereference(inet6_protos[proto]);
879 if (!ops || !ops->gro_receive)
880 goto out_unlock;
881
882 iph = ipv6_hdr(skb);
883 }
884
885 IPV6_GRO_CB(skb)->proto = proto;
886
887 flush--;
888 nlen = skb_network_header_len(skb);
889
890 for (p = *head; p; p = p->next) {
891 struct ipv6hdr *iph2;
892
893 if (!NAPI_GRO_CB(p)->same_flow)
894 continue;
895
896 iph2 = ipv6_hdr(p);
897
898 /* All fields must match except length. */
899 if (nlen != skb_network_header_len(p) ||
900 memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
901 memcmp(&iph->nexthdr, &iph2->nexthdr,
902 nlen - offsetof(struct ipv6hdr, nexthdr))) {
903 NAPI_GRO_CB(p)->same_flow = 0;
904 continue;
905 }
906
907 NAPI_GRO_CB(p)->flush |= flush;
908 }
909
910 NAPI_GRO_CB(skb)->flush |= flush;
911
912 csum = skb->csum;
913 skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
914
915 pp = ops->gro_receive(head, skb);
916
917 skb->csum = csum;
918
919out_unlock:
920 rcu_read_unlock();
921
922out:
923 NAPI_GRO_CB(skb)->flush |= flush;
924
925 return pp;
926}
927
928static int ipv6_gro_complete(struct sk_buff *skb)
929{
930 const struct inet6_protocol *ops;
931 struct ipv6hdr *iph = ipv6_hdr(skb);
932 int err = -ENOSYS;
933
934 iph->payload_len = htons(skb->len - skb_network_offset(skb) -
935 sizeof(*iph));
936
937 rcu_read_lock();
938 ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
939 if (WARN_ON(!ops || !ops->gro_complete))
940 goto out_unlock;
941
942 err = ops->gro_complete(skb);
943
944out_unlock:
945 rcu_read_unlock();
946
947 return err;
948}
949
950static struct packet_type ipv6_packet_type __read_mostly = {
951 .type = cpu_to_be16(ETH_P_IPV6),
952 .func = ipv6_rcv,
953 .gso_send_check = ipv6_gso_send_check,
954 .gso_segment = ipv6_gso_segment,
955 .gro_receive = ipv6_gro_receive,
956 .gro_complete = ipv6_gro_complete,
957};
958
959static int __init ipv6_packet_init(void)
960{
961 dev_add_pack(&ipv6_packet_type);
962 return 0;
963}
964
965static void ipv6_packet_cleanup(void)
966{
967 dev_remove_pack(&ipv6_packet_type);
968}
969
970static int __net_init ipv6_init_mibs(struct net *net)
971{
972 if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
973 sizeof(struct udp_mib),
974 __alignof__(struct udp_mib)) < 0)
975 return -ENOMEM;
976 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
977 sizeof(struct udp_mib),
978 __alignof__(struct udp_mib)) < 0)
979 goto err_udplite_mib;
980 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
981 sizeof(struct ipstats_mib),
982 __alignof__(struct ipstats_mib)) < 0)
983 goto err_ip_mib;
984 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
985 sizeof(struct icmpv6_mib),
986 __alignof__(struct icmpv6_mib)) < 0)
987 goto err_icmp_mib;
988 if (snmp_mib_init((void __percpu **)net->mib.icmpv6msg_statistics,
989 sizeof(struct icmpv6msg_mib),
990 __alignof__(struct icmpv6msg_mib)) < 0)
991 goto err_icmpmsg_mib;
992 return 0;
993
994err_icmpmsg_mib:
995 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
996err_icmp_mib:
997 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
998err_ip_mib:
999 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1000err_udplite_mib:
1001 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1002 return -ENOMEM;
1003}
1004
1005static void ipv6_cleanup_mibs(struct net *net)
1006{
1007 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1008 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1009 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
1010 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
1011 snmp_mib_free((void __percpu **)net->mib.icmpv6msg_statistics);
1012}
1013
1014static int __net_init inet6_net_init(struct net *net)
1015{
1016 int err = 0;
1017
1018 net->ipv6.sysctl.bindv6only = 0;
1019 net->ipv6.sysctl.icmpv6_time = 1*HZ;
1020
1021 err = ipv6_init_mibs(net);
1022 if (err)
1023 return err;
1024#ifdef CONFIG_PROC_FS
1025 err = udp6_proc_init(net);
1026 if (err)
1027 goto out;
1028 err = tcp6_proc_init(net);
1029 if (err)
1030 goto proc_tcp6_fail;
1031 err = ac6_proc_init(net);
1032 if (err)
1033 goto proc_ac6_fail;
1034#endif
1035 return err;
1036
1037#ifdef CONFIG_PROC_FS
1038proc_ac6_fail:
1039 tcp6_proc_exit(net);
1040proc_tcp6_fail:
1041 udp6_proc_exit(net);
1042out:
1043 ipv6_cleanup_mibs(net);
1044 return err;
1045#endif
1046}
1047
1048static void __net_exit inet6_net_exit(struct net *net)
1049{
1050#ifdef CONFIG_PROC_FS
1051 udp6_proc_exit(net);
1052 tcp6_proc_exit(net);
1053 ac6_proc_exit(net);
1054#endif
1055 ipv6_cleanup_mibs(net);
1056}
1057
1058static struct pernet_operations inet6_net_ops = {
1059 .init = inet6_net_init,
1060 .exit = inet6_net_exit,
1061};
1062
1063static int __init inet6_init(void)
1064{
1065 struct sk_buff *dummy_skb;
1066 struct list_head *r;
1067 int err = 0;
1068
1069 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1070
1071 /* Register the socket-side information for inet6_create. */
1072 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1073 INIT_LIST_HEAD(r);
1074
1075 if (disable_ipv6_mod) {
1076 printk(KERN_INFO
1077 "IPv6: Loaded, but administratively disabled, "
1078 "reboot required to enable\n");
1079 goto out;
1080 }
1081
1082 err = proto_register(&tcpv6_prot, 1);
1083 if (err)
1084 goto out;
1085
1086 err = proto_register(&udpv6_prot, 1);
1087 if (err)
1088 goto out_unregister_tcp_proto;
1089
1090 err = proto_register(&udplitev6_prot, 1);
1091 if (err)
1092 goto out_unregister_udp_proto;
1093
1094 err = proto_register(&rawv6_prot, 1);
1095 if (err)
1096 goto out_unregister_udplite_proto;
1097
1098
1099 /* We MUST register RAW sockets before we create the ICMP6,
1100 * IGMP6, or NDISC control sockets.
1101 */
1102 err = rawv6_init();
1103 if (err)
1104 goto out_unregister_raw_proto;
1105
1106 /* Register the family here so that the init calls below will
1107 * be able to create sockets. (?? is this dangerous ??)
1108 */
1109 err = sock_register(&inet6_family_ops);
1110 if (err)
1111 goto out_sock_register_fail;
1112
1113#ifdef CONFIG_SYSCTL
1114 err = ipv6_static_sysctl_register();
1115 if (err)
1116 goto static_sysctl_fail;
1117#endif
1118 /*
1119 * ipngwg API draft makes clear that the correct semantics
1120 * for TCP and UDP is to consider one TCP and UDP instance
1121 * in a host available by both INET and INET6 APIs and
1122 * able to communicate via both network protocols.
1123 */
1124
1125 err = register_pernet_subsys(&inet6_net_ops);
1126 if (err)
1127 goto register_pernet_fail;
1128 err = icmpv6_init();
1129 if (err)
1130 goto icmp_fail;
1131 err = ip6_mr_init();
1132 if (err)
1133 goto ipmr_fail;
1134 err = ndisc_init();
1135 if (err)
1136 goto ndisc_fail;
1137 err = igmp6_init();
1138 if (err)
1139 goto igmp_fail;
1140 err = ipv6_netfilter_init();
1141 if (err)
1142 goto netfilter_fail;
1143 /* Create /proc/foo6 entries. */
1144#ifdef CONFIG_PROC_FS
1145 err = -ENOMEM;
1146 if (raw6_proc_init())
1147 goto proc_raw6_fail;
1148 if (udplite6_proc_init())
1149 goto proc_udplite6_fail;
1150 if (ipv6_misc_proc_init())
1151 goto proc_misc6_fail;
1152 if (if6_proc_init())
1153 goto proc_if6_fail;
1154#endif
1155 err = ip6_route_init();
1156 if (err)
1157 goto ip6_route_fail;
1158 err = ip6_flowlabel_init();
1159 if (err)
1160 goto ip6_flowlabel_fail;
1161 err = addrconf_init();
1162 if (err)
1163 goto addrconf_fail;
1164
1165 /* Init v6 extension headers. */
1166 err = ipv6_exthdrs_init();
1167 if (err)
1168 goto ipv6_exthdrs_fail;
1169
1170 err = ipv6_frag_init();
1171 if (err)
1172 goto ipv6_frag_fail;
1173
1174 /* Init v6 transport protocols. */
1175 err = udpv6_init();
1176 if (err)
1177 goto udpv6_fail;
1178
1179 err = udplitev6_init();
1180 if (err)
1181 goto udplitev6_fail;
1182
1183 err = tcpv6_init();
1184 if (err)
1185 goto tcpv6_fail;
1186
1187 err = ipv6_packet_init();
1188 if (err)
1189 goto ipv6_packet_fail;
1190
1191#ifdef CONFIG_SYSCTL
1192 err = ipv6_sysctl_register();
1193 if (err)
1194 goto sysctl_fail;
1195#endif
1196out:
1197 return err;
1198
1199#ifdef CONFIG_SYSCTL
1200sysctl_fail:
1201 ipv6_packet_cleanup();
1202#endif
1203ipv6_packet_fail:
1204 tcpv6_exit();
1205tcpv6_fail:
1206 udplitev6_exit();
1207udplitev6_fail:
1208 udpv6_exit();
1209udpv6_fail:
1210 ipv6_frag_exit();
1211ipv6_frag_fail:
1212 ipv6_exthdrs_exit();
1213ipv6_exthdrs_fail:
1214 addrconf_cleanup();
1215addrconf_fail:
1216 ip6_flowlabel_cleanup();
1217ip6_flowlabel_fail:
1218 ip6_route_cleanup();
1219ip6_route_fail:
1220#ifdef CONFIG_PROC_FS
1221 if6_proc_exit();
1222proc_if6_fail:
1223 ipv6_misc_proc_exit();
1224proc_misc6_fail:
1225 udplite6_proc_exit();
1226proc_udplite6_fail:
1227 raw6_proc_exit();
1228proc_raw6_fail:
1229#endif
1230 ipv6_netfilter_fini();
1231netfilter_fail:
1232 igmp6_cleanup();
1233igmp_fail:
1234 ndisc_cleanup();
1235ndisc_fail:
1236 ip6_mr_cleanup();
1237ipmr_fail:
1238 icmpv6_cleanup();
1239icmp_fail:
1240 unregister_pernet_subsys(&inet6_net_ops);
1241register_pernet_fail:
1242#ifdef CONFIG_SYSCTL
1243 ipv6_static_sysctl_unregister();
1244static_sysctl_fail:
1245#endif
1246 sock_unregister(PF_INET6);
1247 rtnl_unregister_all(PF_INET6);
1248out_sock_register_fail:
1249 rawv6_exit();
1250out_unregister_raw_proto:
1251 proto_unregister(&rawv6_prot);
1252out_unregister_udplite_proto:
1253 proto_unregister(&udplitev6_prot);
1254out_unregister_udp_proto:
1255 proto_unregister(&udpv6_prot);
1256out_unregister_tcp_proto:
1257 proto_unregister(&tcpv6_prot);
1258 goto out;
1259}
1260module_init(inet6_init);
1261
1262static void __exit inet6_exit(void)
1263{
1264 if (disable_ipv6_mod)
1265 return;
1266
1267 /* First of all disallow new sockets creation. */
1268 sock_unregister(PF_INET6);
1269 /* Disallow any further netlink messages */
1270 rtnl_unregister_all(PF_INET6);
1271
1272#ifdef CONFIG_SYSCTL
1273 ipv6_sysctl_unregister();
1274#endif
1275 udpv6_exit();
1276 udplitev6_exit();
1277 tcpv6_exit();
1278
1279 /* Cleanup code parts. */
1280 ipv6_packet_cleanup();
1281 ipv6_frag_exit();
1282 ipv6_exthdrs_exit();
1283 addrconf_cleanup();
1284 ip6_flowlabel_cleanup();
1285 ip6_route_cleanup();
1286#ifdef CONFIG_PROC_FS
1287
1288 /* Cleanup code parts. */
1289 if6_proc_exit();
1290 ipv6_misc_proc_exit();
1291 udplite6_proc_exit();
1292 raw6_proc_exit();
1293#endif
1294 ipv6_netfilter_fini();
1295 igmp6_cleanup();
1296 ndisc_cleanup();
1297 ip6_mr_cleanup();
1298 icmpv6_cleanup();
1299 rawv6_exit();
1300
1301 unregister_pernet_subsys(&inet6_net_ops);
1302#ifdef CONFIG_SYSCTL
1303 ipv6_static_sysctl_unregister();
1304#endif
1305 proto_unregister(&rawv6_prot);
1306 proto_unregister(&udplitev6_prot);
1307 proto_unregister(&udpv6_prot);
1308 proto_unregister(&tcpv6_prot);
1309
1310 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1311}
1312module_exit(inet6_exit);
1313
1314MODULE_ALIAS_NETPROTO(PF_INET6);
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#include <net/compat.h>
64#include <net/xfrm.h>
65#include <net/ioam6.h>
66#include <net/rawv6.h>
67
68#include <linux/uaccess.h>
69#include <linux/mroute6.h>
70
71#include "ip6_offload.h"
72
73MODULE_AUTHOR("Cast of dozens");
74MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
75MODULE_LICENSE("GPL");
76
77/* The inetsw6 table contains everything that inet6_create needs to
78 * build a new socket.
79 */
80static struct list_head inetsw6[SOCK_MAX];
81static DEFINE_SPINLOCK(inetsw6_lock);
82
83struct ipv6_params ipv6_defaults = {
84 .disable_ipv6 = 0,
85 .autoconf = 1,
86};
87
88static int disable_ipv6_mod;
89
90module_param_named(disable, disable_ipv6_mod, int, 0444);
91MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
92
93module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
94MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
95
96module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
97MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
98
99bool ipv6_mod_enabled(void)
100{
101 return disable_ipv6_mod == 0;
102}
103EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
104
105static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
106{
107 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
108
109 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
110}
111
112void inet6_sock_destruct(struct sock *sk)
113{
114 inet6_cleanup_sock(sk);
115 inet_sock_destruct(sk);
116}
117EXPORT_SYMBOL_GPL(inet6_sock_destruct);
118
119static int inet6_create(struct net *net, struct socket *sock, int protocol,
120 int kern)
121{
122 struct inet_sock *inet;
123 struct ipv6_pinfo *np;
124 struct sock *sk;
125 struct inet_protosw *answer;
126 struct proto *answer_prot;
127 unsigned char answer_flags;
128 int try_loading_module = 0;
129 int err;
130
131 if (protocol < 0 || protocol >= IPPROTO_MAX)
132 return -EINVAL;
133
134 /* Look for the requested type/protocol pair. */
135lookup_protocol:
136 err = -ESOCKTNOSUPPORT;
137 rcu_read_lock();
138 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
139
140 err = 0;
141 /* Check the non-wild match. */
142 if (protocol == answer->protocol) {
143 if (protocol != IPPROTO_IP)
144 break;
145 } else {
146 /* Check for the two wild cases. */
147 if (IPPROTO_IP == protocol) {
148 protocol = answer->protocol;
149 break;
150 }
151 if (IPPROTO_IP == answer->protocol)
152 break;
153 }
154 err = -EPROTONOSUPPORT;
155 }
156
157 if (err) {
158 if (try_loading_module < 2) {
159 rcu_read_unlock();
160 /*
161 * Be more specific, e.g. net-pf-10-proto-132-type-1
162 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
163 */
164 if (++try_loading_module == 1)
165 request_module("net-pf-%d-proto-%d-type-%d",
166 PF_INET6, protocol, sock->type);
167 /*
168 * Fall back to generic, e.g. net-pf-10-proto-132
169 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
170 */
171 else
172 request_module("net-pf-%d-proto-%d",
173 PF_INET6, protocol);
174 goto lookup_protocol;
175 } else
176 goto out_rcu_unlock;
177 }
178
179 err = -EPERM;
180 if (sock->type == SOCK_RAW && !kern &&
181 !ns_capable(net->user_ns, CAP_NET_RAW))
182 goto out_rcu_unlock;
183
184 sock->ops = answer->ops;
185 answer_prot = answer->prot;
186 answer_flags = answer->flags;
187 rcu_read_unlock();
188
189 WARN_ON(!answer_prot->slab);
190
191 err = -ENOBUFS;
192 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
193 if (!sk)
194 goto out;
195
196 sock_init_data(sock, sk);
197
198 err = 0;
199 if (INET_PROTOSW_REUSE & answer_flags)
200 sk->sk_reuse = SK_CAN_REUSE;
201
202 inet = inet_sk(sk);
203 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
204
205 if (SOCK_RAW == sock->type) {
206 inet->inet_num = protocol;
207 if (IPPROTO_RAW == protocol)
208 inet->hdrincl = 1;
209 }
210
211 sk->sk_destruct = inet6_sock_destruct;
212 sk->sk_family = PF_INET6;
213 sk->sk_protocol = protocol;
214
215 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
216
217 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
218 np->hop_limit = -1;
219 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
220 np->mc_loop = 1;
221 np->mc_all = 1;
222 np->pmtudisc = IPV6_PMTUDISC_WANT;
223 np->repflow = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
224 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
225 sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
226
227 /* Init the ipv4 part of the socket since we can have sockets
228 * using v6 API for ipv4.
229 */
230 inet->uc_ttl = -1;
231
232 inet->mc_loop = 1;
233 inet->mc_ttl = 1;
234 inet->mc_index = 0;
235 RCU_INIT_POINTER(inet->mc_list, NULL);
236 inet->rcv_tos = 0;
237
238 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
239 inet->pmtudisc = IP_PMTUDISC_DONT;
240 else
241 inet->pmtudisc = IP_PMTUDISC_WANT;
242 /*
243 * Increment only the relevant sk_prot->socks debug field, this changes
244 * the previous behaviour of incrementing both the equivalent to
245 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
246 *
247 * This allows better debug granularity as we'll know exactly how many
248 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
249 * transport protocol socks. -acme
250 */
251 sk_refcnt_debug_inc(sk);
252
253 if (inet->inet_num) {
254 /* It assumes that any protocol which allows
255 * the user to assign a number at socket
256 * creation time automatically shares.
257 */
258 inet->inet_sport = htons(inet->inet_num);
259 err = sk->sk_prot->hash(sk);
260 if (err) {
261 sk_common_release(sk);
262 goto out;
263 }
264 }
265 if (sk->sk_prot->init) {
266 err = sk->sk_prot->init(sk);
267 if (err) {
268 sk_common_release(sk);
269 goto out;
270 }
271 }
272
273 if (!kern) {
274 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
275 if (err) {
276 sk_common_release(sk);
277 goto out;
278 }
279 }
280out:
281 return err;
282out_rcu_unlock:
283 rcu_read_unlock();
284 goto out;
285}
286
287static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
288 u32 flags)
289{
290 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
291 struct inet_sock *inet = inet_sk(sk);
292 struct ipv6_pinfo *np = inet6_sk(sk);
293 struct net *net = sock_net(sk);
294 __be32 v4addr = 0;
295 unsigned short snum;
296 bool saved_ipv6only;
297 int addr_type = 0;
298 int err = 0;
299
300 if (addr->sin6_family != AF_INET6)
301 return -EAFNOSUPPORT;
302
303 addr_type = ipv6_addr_type(&addr->sin6_addr);
304 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
305 return -EINVAL;
306
307 snum = ntohs(addr->sin6_port);
308 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
309 snum && inet_port_requires_bind_service(net, snum) &&
310 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
311 return -EACCES;
312
313 if (flags & BIND_WITH_LOCK)
314 lock_sock(sk);
315
316 /* Check these errors (active socket, double bind). */
317 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
318 err = -EINVAL;
319 goto out;
320 }
321
322 /* Check if the address belongs to the host. */
323 if (addr_type == IPV6_ADDR_MAPPED) {
324 struct net_device *dev = NULL;
325 int chk_addr_ret;
326
327 /* Binding to v4-mapped address on a v6-only socket
328 * makes no sense
329 */
330 if (ipv6_only_sock(sk)) {
331 err = -EINVAL;
332 goto out;
333 }
334
335 rcu_read_lock();
336 if (sk->sk_bound_dev_if) {
337 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
338 if (!dev) {
339 err = -ENODEV;
340 goto out_unlock;
341 }
342 }
343
344 /* Reproduce AF_INET checks to make the bindings consistent */
345 v4addr = addr->sin6_addr.s6_addr32[3];
346 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
347 rcu_read_unlock();
348
349 if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
350 chk_addr_ret)) {
351 err = -EADDRNOTAVAIL;
352 goto out;
353 }
354 } else {
355 if (addr_type != IPV6_ADDR_ANY) {
356 struct net_device *dev = NULL;
357
358 rcu_read_lock();
359 if (__ipv6_addr_needs_scope_id(addr_type)) {
360 if (addr_len >= sizeof(struct sockaddr_in6) &&
361 addr->sin6_scope_id) {
362 /* Override any existing binding, if another one
363 * is supplied by user.
364 */
365 sk->sk_bound_dev_if = addr->sin6_scope_id;
366 }
367
368 /* Binding to link-local address requires an interface */
369 if (!sk->sk_bound_dev_if) {
370 err = -EINVAL;
371 goto out_unlock;
372 }
373 }
374
375 if (sk->sk_bound_dev_if) {
376 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
377 if (!dev) {
378 err = -ENODEV;
379 goto out_unlock;
380 }
381 }
382
383 /* ipv4 addr of the socket is invalid. Only the
384 * unspecified and mapped address have a v4 equivalent.
385 */
386 v4addr = LOOPBACK4_IPV6;
387 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
388 if (!ipv6_can_nonlocal_bind(net, inet) &&
389 !ipv6_chk_addr(net, &addr->sin6_addr,
390 dev, 0)) {
391 err = -EADDRNOTAVAIL;
392 goto out_unlock;
393 }
394 }
395 rcu_read_unlock();
396 }
397 }
398
399 inet->inet_rcv_saddr = v4addr;
400 inet->inet_saddr = v4addr;
401
402 sk->sk_v6_rcv_saddr = addr->sin6_addr;
403
404 if (!(addr_type & IPV6_ADDR_MULTICAST))
405 np->saddr = addr->sin6_addr;
406
407 saved_ipv6only = sk->sk_ipv6only;
408 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
409 sk->sk_ipv6only = 1;
410
411 /* Make sure we are allowed to bind here. */
412 if (snum || !(inet->bind_address_no_port ||
413 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
414 err = sk->sk_prot->get_port(sk, snum);
415 if (err) {
416 sk->sk_ipv6only = saved_ipv6only;
417 inet_reset_saddr(sk);
418 goto out;
419 }
420 if (!(flags & BIND_FROM_BPF)) {
421 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
422 if (err) {
423 sk->sk_ipv6only = saved_ipv6only;
424 inet_reset_saddr(sk);
425 if (sk->sk_prot->put_port)
426 sk->sk_prot->put_port(sk);
427 goto out;
428 }
429 }
430 }
431
432 if (addr_type != IPV6_ADDR_ANY)
433 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
434 if (snum)
435 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
436 inet->inet_sport = htons(inet->inet_num);
437 inet->inet_dport = 0;
438 inet->inet_daddr = 0;
439out:
440 if (flags & BIND_WITH_LOCK)
441 release_sock(sk);
442 return err;
443out_unlock:
444 rcu_read_unlock();
445 goto out;
446}
447
448/* bind for INET6 API */
449int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
450{
451 struct sock *sk = sock->sk;
452 u32 flags = BIND_WITH_LOCK;
453 const struct proto *prot;
454 int err = 0;
455
456 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
457 prot = READ_ONCE(sk->sk_prot);
458 /* If the socket has its own bind function then use it. */
459 if (prot->bind)
460 return prot->bind(sk, uaddr, addr_len);
461
462 if (addr_len < SIN6_LEN_RFC2133)
463 return -EINVAL;
464
465 /* BPF prog is run before any checks are done so that if the prog
466 * changes context in a wrong way it will be caught.
467 */
468 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr,
469 CGROUP_INET6_BIND, &flags);
470 if (err)
471 return err;
472
473 return __inet6_bind(sk, uaddr, addr_len, flags);
474}
475EXPORT_SYMBOL(inet6_bind);
476
477int inet6_release(struct socket *sock)
478{
479 struct sock *sk = sock->sk;
480
481 if (!sk)
482 return -EINVAL;
483
484 /* Free mc lists */
485 ipv6_sock_mc_close(sk);
486
487 /* Free ac lists */
488 ipv6_sock_ac_close(sk);
489
490 return inet_release(sock);
491}
492EXPORT_SYMBOL(inet6_release);
493
494void inet6_cleanup_sock(struct sock *sk)
495{
496 struct ipv6_pinfo *np = inet6_sk(sk);
497 struct sk_buff *skb;
498 struct ipv6_txoptions *opt;
499
500 /* Release rx options */
501
502 skb = xchg(&np->pktoptions, NULL);
503 kfree_skb(skb);
504
505 skb = xchg(&np->rxpmtu, NULL);
506 kfree_skb(skb);
507
508 /* Free flowlabels */
509 fl6_free_socklist(sk);
510
511 /* Free tx options */
512
513 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
514 if (opt) {
515 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
516 txopt_put(opt);
517 }
518}
519EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
520
521/*
522 * This does both peername and sockname.
523 */
524int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
525 int peer)
526{
527 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
528 struct sock *sk = sock->sk;
529 struct inet_sock *inet = inet_sk(sk);
530 struct ipv6_pinfo *np = inet6_sk(sk);
531
532 sin->sin6_family = AF_INET6;
533 sin->sin6_flowinfo = 0;
534 sin->sin6_scope_id = 0;
535 lock_sock(sk);
536 if (peer) {
537 if (!inet->inet_dport ||
538 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
539 peer == 1)) {
540 release_sock(sk);
541 return -ENOTCONN;
542 }
543 sin->sin6_port = inet->inet_dport;
544 sin->sin6_addr = sk->sk_v6_daddr;
545 if (np->sndflow)
546 sin->sin6_flowinfo = np->flow_label;
547 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
548 CGROUP_INET6_GETPEERNAME);
549 } else {
550 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
551 sin->sin6_addr = np->saddr;
552 else
553 sin->sin6_addr = sk->sk_v6_rcv_saddr;
554 sin->sin6_port = inet->inet_sport;
555 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
556 CGROUP_INET6_GETSOCKNAME);
557 }
558 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
559 sk->sk_bound_dev_if);
560 release_sock(sk);
561 return sizeof(*sin);
562}
563EXPORT_SYMBOL(inet6_getname);
564
565int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
566{
567 void __user *argp = (void __user *)arg;
568 struct sock *sk = sock->sk;
569 struct net *net = sock_net(sk);
570 const struct proto *prot;
571
572 switch (cmd) {
573 case SIOCADDRT:
574 case SIOCDELRT: {
575 struct in6_rtmsg rtmsg;
576
577 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
578 return -EFAULT;
579 return ipv6_route_ioctl(net, cmd, &rtmsg);
580 }
581 case SIOCSIFADDR:
582 return addrconf_add_ifaddr(net, argp);
583 case SIOCDIFADDR:
584 return addrconf_del_ifaddr(net, argp);
585 case SIOCSIFDSTADDR:
586 return addrconf_set_dstaddr(net, argp);
587 default:
588 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
589 prot = READ_ONCE(sk->sk_prot);
590 if (!prot->ioctl)
591 return -ENOIOCTLCMD;
592 return prot->ioctl(sk, cmd, arg);
593 }
594 /*NOTREACHED*/
595 return 0;
596}
597EXPORT_SYMBOL(inet6_ioctl);
598
599#ifdef CONFIG_COMPAT
600struct compat_in6_rtmsg {
601 struct in6_addr rtmsg_dst;
602 struct in6_addr rtmsg_src;
603 struct in6_addr rtmsg_gateway;
604 u32 rtmsg_type;
605 u16 rtmsg_dst_len;
606 u16 rtmsg_src_len;
607 u32 rtmsg_metric;
608 u32 rtmsg_info;
609 u32 rtmsg_flags;
610 s32 rtmsg_ifindex;
611};
612
613static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
614 struct compat_in6_rtmsg __user *ur)
615{
616 struct in6_rtmsg rt;
617
618 if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
619 3 * sizeof(struct in6_addr)) ||
620 get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
621 get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
622 get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
623 get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
624 get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
625 get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
626 get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
627 return -EFAULT;
628
629
630 return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
631}
632
633int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
634{
635 void __user *argp = compat_ptr(arg);
636 struct sock *sk = sock->sk;
637
638 switch (cmd) {
639 case SIOCADDRT:
640 case SIOCDELRT:
641 return inet6_compat_routing_ioctl(sk, cmd, argp);
642 default:
643 return -ENOIOCTLCMD;
644 }
645}
646EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
647#endif /* CONFIG_COMPAT */
648
649INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
650 size_t));
651int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
652{
653 struct sock *sk = sock->sk;
654 const struct proto *prot;
655
656 if (unlikely(inet_send_prepare(sk)))
657 return -EAGAIN;
658
659 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
660 prot = READ_ONCE(sk->sk_prot);
661 return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
662 sk, msg, size);
663}
664
665INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
666 size_t, int, int *));
667int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
668 int flags)
669{
670 struct sock *sk = sock->sk;
671 const struct proto *prot;
672 int addr_len = 0;
673 int err;
674
675 if (likely(!(flags & MSG_ERRQUEUE)))
676 sock_rps_record_flow(sk);
677
678 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
679 prot = READ_ONCE(sk->sk_prot);
680 err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
681 sk, msg, size, flags, &addr_len);
682 if (err >= 0)
683 msg->msg_namelen = addr_len;
684 return err;
685}
686
687const struct proto_ops inet6_stream_ops = {
688 .family = PF_INET6,
689 .owner = THIS_MODULE,
690 .release = inet6_release,
691 .bind = inet6_bind,
692 .connect = inet_stream_connect, /* ok */
693 .socketpair = sock_no_socketpair, /* a do nothing */
694 .accept = inet_accept, /* ok */
695 .getname = inet6_getname,
696 .poll = tcp_poll, /* ok */
697 .ioctl = inet6_ioctl, /* must change */
698 .gettstamp = sock_gettstamp,
699 .listen = inet_listen, /* ok */
700 .shutdown = inet_shutdown, /* ok */
701 .setsockopt = sock_common_setsockopt, /* ok */
702 .getsockopt = sock_common_getsockopt, /* ok */
703 .sendmsg = inet6_sendmsg, /* retpoline's sake */
704 .recvmsg = inet6_recvmsg, /* retpoline's sake */
705#ifdef CONFIG_MMU
706 .mmap = tcp_mmap,
707#endif
708 .sendpage = inet_sendpage,
709 .sendmsg_locked = tcp_sendmsg_locked,
710 .sendpage_locked = tcp_sendpage_locked,
711 .splice_read = tcp_splice_read,
712 .read_sock = tcp_read_sock,
713 .read_skb = tcp_read_skb,
714 .peek_len = tcp_peek_len,
715#ifdef CONFIG_COMPAT
716 .compat_ioctl = inet6_compat_ioctl,
717#endif
718 .set_rcvlowat = tcp_set_rcvlowat,
719};
720
721const struct proto_ops inet6_dgram_ops = {
722 .family = PF_INET6,
723 .owner = THIS_MODULE,
724 .release = inet6_release,
725 .bind = inet6_bind,
726 .connect = inet_dgram_connect, /* ok */
727 .socketpair = sock_no_socketpair, /* a do nothing */
728 .accept = sock_no_accept, /* a do nothing */
729 .getname = inet6_getname,
730 .poll = udp_poll, /* ok */
731 .ioctl = inet6_ioctl, /* must change */
732 .gettstamp = sock_gettstamp,
733 .listen = sock_no_listen, /* ok */
734 .shutdown = inet_shutdown, /* ok */
735 .setsockopt = sock_common_setsockopt, /* ok */
736 .getsockopt = sock_common_getsockopt, /* ok */
737 .sendmsg = inet6_sendmsg, /* retpoline's sake */
738 .recvmsg = inet6_recvmsg, /* retpoline's sake */
739 .read_skb = udp_read_skb,
740 .mmap = sock_no_mmap,
741 .sendpage = sock_no_sendpage,
742 .set_peek_off = sk_set_peek_off,
743#ifdef CONFIG_COMPAT
744 .compat_ioctl = inet6_compat_ioctl,
745#endif
746};
747
748static const struct net_proto_family inet6_family_ops = {
749 .family = PF_INET6,
750 .create = inet6_create,
751 .owner = THIS_MODULE,
752};
753
754int inet6_register_protosw(struct inet_protosw *p)
755{
756 struct list_head *lh;
757 struct inet_protosw *answer;
758 struct list_head *last_perm;
759 int protocol = p->protocol;
760 int ret;
761
762 spin_lock_bh(&inetsw6_lock);
763
764 ret = -EINVAL;
765 if (p->type >= SOCK_MAX)
766 goto out_illegal;
767
768 /* If we are trying to override a permanent protocol, bail. */
769 answer = NULL;
770 ret = -EPERM;
771 last_perm = &inetsw6[p->type];
772 list_for_each(lh, &inetsw6[p->type]) {
773 answer = list_entry(lh, struct inet_protosw, list);
774
775 /* Check only the non-wild match. */
776 if (INET_PROTOSW_PERMANENT & answer->flags) {
777 if (protocol == answer->protocol)
778 break;
779 last_perm = lh;
780 }
781
782 answer = NULL;
783 }
784 if (answer)
785 goto out_permanent;
786
787 /* Add the new entry after the last permanent entry if any, so that
788 * the new entry does not override a permanent entry when matched with
789 * a wild-card protocol. But it is allowed to override any existing
790 * non-permanent entry. This means that when we remove this entry, the
791 * system automatically returns to the old behavior.
792 */
793 list_add_rcu(&p->list, last_perm);
794 ret = 0;
795out:
796 spin_unlock_bh(&inetsw6_lock);
797 return ret;
798
799out_permanent:
800 pr_err("Attempt to override permanent protocol %d\n", protocol);
801 goto out;
802
803out_illegal:
804 pr_err("Ignoring attempt to register invalid socket type %d\n",
805 p->type);
806 goto out;
807}
808EXPORT_SYMBOL(inet6_register_protosw);
809
810void
811inet6_unregister_protosw(struct inet_protosw *p)
812{
813 if (INET_PROTOSW_PERMANENT & p->flags) {
814 pr_err("Attempt to unregister permanent protocol %d\n",
815 p->protocol);
816 } else {
817 spin_lock_bh(&inetsw6_lock);
818 list_del_rcu(&p->list);
819 spin_unlock_bh(&inetsw6_lock);
820
821 synchronize_net();
822 }
823}
824EXPORT_SYMBOL(inet6_unregister_protosw);
825
826int inet6_sk_rebuild_header(struct sock *sk)
827{
828 struct ipv6_pinfo *np = inet6_sk(sk);
829 struct dst_entry *dst;
830
831 dst = __sk_dst_check(sk, np->dst_cookie);
832
833 if (!dst) {
834 struct inet_sock *inet = inet_sk(sk);
835 struct in6_addr *final_p, final;
836 struct flowi6 fl6;
837
838 memset(&fl6, 0, sizeof(fl6));
839 fl6.flowi6_proto = sk->sk_protocol;
840 fl6.daddr = sk->sk_v6_daddr;
841 fl6.saddr = np->saddr;
842 fl6.flowlabel = np->flow_label;
843 fl6.flowi6_oif = sk->sk_bound_dev_if;
844 fl6.flowi6_mark = sk->sk_mark;
845 fl6.fl6_dport = inet->inet_dport;
846 fl6.fl6_sport = inet->inet_sport;
847 fl6.flowi6_uid = sk->sk_uid;
848 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
849
850 rcu_read_lock();
851 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
852 &final);
853 rcu_read_unlock();
854
855 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
856 if (IS_ERR(dst)) {
857 sk->sk_route_caps = 0;
858 sk->sk_err_soft = -PTR_ERR(dst);
859 return PTR_ERR(dst);
860 }
861
862 ip6_dst_store(sk, dst, NULL, NULL);
863 }
864
865 return 0;
866}
867EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
868
869bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
870 const struct inet6_skb_parm *opt)
871{
872 const struct ipv6_pinfo *np = inet6_sk(sk);
873
874 if (np->rxopt.all) {
875 if (((opt->flags & IP6SKB_HOPBYHOP) &&
876 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
877 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
878 np->rxopt.bits.rxflow) ||
879 (opt->srcrt && (np->rxopt.bits.srcrt ||
880 np->rxopt.bits.osrcrt)) ||
881 ((opt->dst1 || opt->dst0) &&
882 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
883 return true;
884 }
885 return false;
886}
887EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
888
889static struct packet_type ipv6_packet_type __read_mostly = {
890 .type = cpu_to_be16(ETH_P_IPV6),
891 .func = ipv6_rcv,
892 .list_func = ipv6_list_rcv,
893};
894
895static int __init ipv6_packet_init(void)
896{
897 dev_add_pack(&ipv6_packet_type);
898 return 0;
899}
900
901static void ipv6_packet_cleanup(void)
902{
903 dev_remove_pack(&ipv6_packet_type);
904}
905
906static int __net_init ipv6_init_mibs(struct net *net)
907{
908 int i;
909
910 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
911 if (!net->mib.udp_stats_in6)
912 return -ENOMEM;
913 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
914 if (!net->mib.udplite_stats_in6)
915 goto err_udplite_mib;
916 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
917 if (!net->mib.ipv6_statistics)
918 goto err_ip_mib;
919
920 for_each_possible_cpu(i) {
921 struct ipstats_mib *af_inet6_stats;
922 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
923 u64_stats_init(&af_inet6_stats->syncp);
924 }
925
926
927 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
928 if (!net->mib.icmpv6_statistics)
929 goto err_icmp_mib;
930 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
931 GFP_KERNEL);
932 if (!net->mib.icmpv6msg_statistics)
933 goto err_icmpmsg_mib;
934 return 0;
935
936err_icmpmsg_mib:
937 free_percpu(net->mib.icmpv6_statistics);
938err_icmp_mib:
939 free_percpu(net->mib.ipv6_statistics);
940err_ip_mib:
941 free_percpu(net->mib.udplite_stats_in6);
942err_udplite_mib:
943 free_percpu(net->mib.udp_stats_in6);
944 return -ENOMEM;
945}
946
947static void ipv6_cleanup_mibs(struct net *net)
948{
949 free_percpu(net->mib.udp_stats_in6);
950 free_percpu(net->mib.udplite_stats_in6);
951 free_percpu(net->mib.ipv6_statistics);
952 free_percpu(net->mib.icmpv6_statistics);
953 kfree(net->mib.icmpv6msg_statistics);
954}
955
956static int __net_init inet6_net_init(struct net *net)
957{
958 int err = 0;
959
960 net->ipv6.sysctl.bindv6only = 0;
961 net->ipv6.sysctl.icmpv6_time = 1*HZ;
962 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
963 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
964 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
965
966 /* By default, rate limit error messages.
967 * Except for pmtu discovery, it would break it.
968 * proc_do_large_bitmap needs pointer to the bitmap.
969 */
970 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
971 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
972 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
973
974 net->ipv6.sysctl.flowlabel_consistency = 1;
975 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
976 net->ipv6.sysctl.idgen_retries = 3;
977 net->ipv6.sysctl.idgen_delay = 1 * HZ;
978 net->ipv6.sysctl.flowlabel_state_ranges = 0;
979 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
980 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
981 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
982 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
983 net->ipv6.sysctl.fib_notify_on_flag_change = 0;
984 atomic_set(&net->ipv6.fib6_sernum, 1);
985
986 net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID;
987 net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE;
988
989 err = ipv6_init_mibs(net);
990 if (err)
991 return err;
992#ifdef CONFIG_PROC_FS
993 err = udp6_proc_init(net);
994 if (err)
995 goto out;
996 err = tcp6_proc_init(net);
997 if (err)
998 goto proc_tcp6_fail;
999 err = ac6_proc_init(net);
1000 if (err)
1001 goto proc_ac6_fail;
1002#endif
1003 return err;
1004
1005#ifdef CONFIG_PROC_FS
1006proc_ac6_fail:
1007 tcp6_proc_exit(net);
1008proc_tcp6_fail:
1009 udp6_proc_exit(net);
1010out:
1011 ipv6_cleanup_mibs(net);
1012 return err;
1013#endif
1014}
1015
1016static void __net_exit inet6_net_exit(struct net *net)
1017{
1018#ifdef CONFIG_PROC_FS
1019 udp6_proc_exit(net);
1020 tcp6_proc_exit(net);
1021 ac6_proc_exit(net);
1022#endif
1023 ipv6_cleanup_mibs(net);
1024}
1025
1026static struct pernet_operations inet6_net_ops = {
1027 .init = inet6_net_init,
1028 .exit = inet6_net_exit,
1029};
1030
1031static int ipv6_route_input(struct sk_buff *skb)
1032{
1033 ip6_route_input(skb);
1034 return skb_dst(skb)->error;
1035}
1036
1037static const struct ipv6_stub ipv6_stub_impl = {
1038 .ipv6_sock_mc_join = ipv6_sock_mc_join,
1039 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1040 .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1041 .ipv6_route_input = ipv6_route_input,
1042 .fib6_get_table = fib6_get_table,
1043 .fib6_table_lookup = fib6_table_lookup,
1044 .fib6_lookup = fib6_lookup,
1045 .fib6_select_path = fib6_select_path,
1046 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1047 .fib6_nh_init = fib6_nh_init,
1048 .fib6_nh_release = fib6_nh_release,
1049 .fib6_nh_release_dsts = fib6_nh_release_dsts,
1050 .fib6_update_sernum = fib6_update_sernum_stub,
1051 .fib6_rt_update = fib6_rt_update,
1052 .ip6_del_rt = ip6_del_rt,
1053 .udpv6_encap_enable = udpv6_encap_enable,
1054 .ndisc_send_na = ndisc_send_na,
1055#if IS_ENABLED(CONFIG_XFRM)
1056 .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1057 .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1058 .xfrm6_rcv_encap = xfrm6_rcv_encap,
1059#endif
1060 .nd_tbl = &nd_tbl,
1061 .ipv6_fragment = ip6_fragment,
1062 .ipv6_dev_find = ipv6_dev_find,
1063};
1064
1065static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1066 .inet6_bind = __inet6_bind,
1067 .udp6_lib_lookup = __udp6_lib_lookup,
1068 .ipv6_setsockopt = do_ipv6_setsockopt,
1069 .ipv6_getsockopt = do_ipv6_getsockopt,
1070};
1071
1072static int __init inet6_init(void)
1073{
1074 struct list_head *r;
1075 int err = 0;
1076
1077 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1078
1079 /* Register the socket-side information for inet6_create. */
1080 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1081 INIT_LIST_HEAD(r);
1082
1083 raw_hashinfo_init(&raw_v6_hashinfo);
1084
1085 if (disable_ipv6_mod) {
1086 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1087 goto out;
1088 }
1089
1090 err = proto_register(&tcpv6_prot, 1);
1091 if (err)
1092 goto out;
1093
1094 err = proto_register(&udpv6_prot, 1);
1095 if (err)
1096 goto out_unregister_tcp_proto;
1097
1098 err = proto_register(&udplitev6_prot, 1);
1099 if (err)
1100 goto out_unregister_udp_proto;
1101
1102 err = proto_register(&rawv6_prot, 1);
1103 if (err)
1104 goto out_unregister_udplite_proto;
1105
1106 err = proto_register(&pingv6_prot, 1);
1107 if (err)
1108 goto out_unregister_raw_proto;
1109
1110 /* We MUST register RAW sockets before we create the ICMP6,
1111 * IGMP6, or NDISC control sockets.
1112 */
1113 err = rawv6_init();
1114 if (err)
1115 goto out_unregister_ping_proto;
1116
1117 /* Register the family here so that the init calls below will
1118 * be able to create sockets. (?? is this dangerous ??)
1119 */
1120 err = sock_register(&inet6_family_ops);
1121 if (err)
1122 goto out_sock_register_fail;
1123
1124 /*
1125 * ipngwg API draft makes clear that the correct semantics
1126 * for TCP and UDP is to consider one TCP and UDP instance
1127 * in a host available by both INET and INET6 APIs and
1128 * able to communicate via both network protocols.
1129 */
1130
1131 err = register_pernet_subsys(&inet6_net_ops);
1132 if (err)
1133 goto register_pernet_fail;
1134 err = ip6_mr_init();
1135 if (err)
1136 goto ipmr_fail;
1137 err = icmpv6_init();
1138 if (err)
1139 goto icmp_fail;
1140 err = ndisc_init();
1141 if (err)
1142 goto ndisc_fail;
1143 err = igmp6_init();
1144 if (err)
1145 goto igmp_fail;
1146
1147 err = ipv6_netfilter_init();
1148 if (err)
1149 goto netfilter_fail;
1150 /* Create /proc/foo6 entries. */
1151#ifdef CONFIG_PROC_FS
1152 err = -ENOMEM;
1153 if (raw6_proc_init())
1154 goto proc_raw6_fail;
1155 if (udplite6_proc_init())
1156 goto proc_udplite6_fail;
1157 if (ipv6_misc_proc_init())
1158 goto proc_misc6_fail;
1159 if (if6_proc_init())
1160 goto proc_if6_fail;
1161#endif
1162 err = ip6_route_init();
1163 if (err)
1164 goto ip6_route_fail;
1165 err = ndisc_late_init();
1166 if (err)
1167 goto ndisc_late_fail;
1168 err = ip6_flowlabel_init();
1169 if (err)
1170 goto ip6_flowlabel_fail;
1171 err = ipv6_anycast_init();
1172 if (err)
1173 goto ipv6_anycast_fail;
1174 err = addrconf_init();
1175 if (err)
1176 goto addrconf_fail;
1177
1178 /* Init v6 extension headers. */
1179 err = ipv6_exthdrs_init();
1180 if (err)
1181 goto ipv6_exthdrs_fail;
1182
1183 err = ipv6_frag_init();
1184 if (err)
1185 goto ipv6_frag_fail;
1186
1187 /* Init v6 transport protocols. */
1188 err = udpv6_init();
1189 if (err)
1190 goto udpv6_fail;
1191
1192 err = udplitev6_init();
1193 if (err)
1194 goto udplitev6_fail;
1195
1196 err = udpv6_offload_init();
1197 if (err)
1198 goto udpv6_offload_fail;
1199
1200 err = tcpv6_init();
1201 if (err)
1202 goto tcpv6_fail;
1203
1204 err = ipv6_packet_init();
1205 if (err)
1206 goto ipv6_packet_fail;
1207
1208 err = pingv6_init();
1209 if (err)
1210 goto pingv6_fail;
1211
1212 err = calipso_init();
1213 if (err)
1214 goto calipso_fail;
1215
1216 err = seg6_init();
1217 if (err)
1218 goto seg6_fail;
1219
1220 err = rpl_init();
1221 if (err)
1222 goto rpl_fail;
1223
1224 err = ioam6_init();
1225 if (err)
1226 goto ioam6_fail;
1227
1228 err = igmp6_late_init();
1229 if (err)
1230 goto igmp6_late_err;
1231
1232#ifdef CONFIG_SYSCTL
1233 err = ipv6_sysctl_register();
1234 if (err)
1235 goto sysctl_fail;
1236#endif
1237
1238 /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1239 wmb();
1240 ipv6_stub = &ipv6_stub_impl;
1241 ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1242out:
1243 return err;
1244
1245#ifdef CONFIG_SYSCTL
1246sysctl_fail:
1247 igmp6_late_cleanup();
1248#endif
1249igmp6_late_err:
1250 ioam6_exit();
1251ioam6_fail:
1252 rpl_exit();
1253rpl_fail:
1254 seg6_exit();
1255seg6_fail:
1256 calipso_exit();
1257calipso_fail:
1258 pingv6_exit();
1259pingv6_fail:
1260 ipv6_packet_cleanup();
1261ipv6_packet_fail:
1262 tcpv6_exit();
1263tcpv6_fail:
1264 udpv6_offload_exit();
1265udpv6_offload_fail:
1266 udplitev6_exit();
1267udplitev6_fail:
1268 udpv6_exit();
1269udpv6_fail:
1270 ipv6_frag_exit();
1271ipv6_frag_fail:
1272 ipv6_exthdrs_exit();
1273ipv6_exthdrs_fail:
1274 addrconf_cleanup();
1275addrconf_fail:
1276 ipv6_anycast_cleanup();
1277ipv6_anycast_fail:
1278 ip6_flowlabel_cleanup();
1279ip6_flowlabel_fail:
1280 ndisc_late_cleanup();
1281ndisc_late_fail:
1282 ip6_route_cleanup();
1283ip6_route_fail:
1284#ifdef CONFIG_PROC_FS
1285 if6_proc_exit();
1286proc_if6_fail:
1287 ipv6_misc_proc_exit();
1288proc_misc6_fail:
1289 udplite6_proc_exit();
1290proc_udplite6_fail:
1291 raw6_proc_exit();
1292proc_raw6_fail:
1293#endif
1294 ipv6_netfilter_fini();
1295netfilter_fail:
1296 igmp6_cleanup();
1297igmp_fail:
1298 ndisc_cleanup();
1299ndisc_fail:
1300 icmpv6_cleanup();
1301icmp_fail:
1302 ip6_mr_cleanup();
1303ipmr_fail:
1304 unregister_pernet_subsys(&inet6_net_ops);
1305register_pernet_fail:
1306 sock_unregister(PF_INET6);
1307 rtnl_unregister_all(PF_INET6);
1308out_sock_register_fail:
1309 rawv6_exit();
1310out_unregister_ping_proto:
1311 proto_unregister(&pingv6_prot);
1312out_unregister_raw_proto:
1313 proto_unregister(&rawv6_prot);
1314out_unregister_udplite_proto:
1315 proto_unregister(&udplitev6_prot);
1316out_unregister_udp_proto:
1317 proto_unregister(&udpv6_prot);
1318out_unregister_tcp_proto:
1319 proto_unregister(&tcpv6_prot);
1320 goto out;
1321}
1322module_init(inet6_init);
1323
1324MODULE_ALIAS_NETPROTO(PF_INET6);