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[mirror_ubuntu-jammy-kernel.git] / net / ipv6 / af_inet6.c
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
40 #include <linux/inet.h>
41 #include <linux/netdevice.h>
42 #include <linux/icmpv6.h>
43 #include <linux/netfilter_ipv6.h>
44
45 #include <net/ip.h>
46 #include <net/ipv6.h>
47 #include <net/udp.h>
48 #include <net/udplite.h>
49 #include <net/tcp.h>
50 #include <net/ipip.h>
51 #include <net/protocol.h>
52 #include <net/inet_common.h>
53 #include <net/route.h>
54 #include <net/transp_v6.h>
55 #include <net/ip6_route.h>
56 #include <net/addrconf.h>
57 #ifdef CONFIG_IPV6_TUNNEL
58 #include <net/ip6_tunnel.h>
59 #endif
60
61 #include <asm/uaccess.h>
62 #include <asm/system.h>
63 #include <linux/mroute6.h>
64
65 MODULE_AUTHOR("Cast of dozens");
66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
67 MODULE_LICENSE("GPL");
68
69 /* The inetsw6 table contains everything that inet6_create needs to
70 * build a new socket.
71 */
72 static struct list_head inetsw6[SOCK_MAX];
73 static DEFINE_SPINLOCK(inetsw6_lock);
74
75 struct ipv6_params ipv6_defaults = {
76 .disable_ipv6 = 0,
77 .autoconf = 1,
78 };
79
80 static int disable_ipv6_mod = 0;
81
82 module_param_named(disable, disable_ipv6_mod, int, 0444);
83 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
84
85 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
86 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
87
88 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
89 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
90
91 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
92 {
93 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
94
95 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
96 }
97
98 static int inet6_create(struct net *net, struct socket *sock, int protocol)
99 {
100 struct inet_sock *inet;
101 struct ipv6_pinfo *np;
102 struct sock *sk;
103 struct inet_protosw *answer;
104 struct proto *answer_prot;
105 unsigned char answer_flags;
106 char answer_no_check;
107 int try_loading_module = 0;
108 int err;
109
110 if (sock->type != SOCK_RAW &&
111 sock->type != SOCK_DGRAM &&
112 !inet_ehash_secret)
113 build_ehash_secret();
114
115 /* Look for the requested type/protocol pair. */
116 lookup_protocol:
117 err = -ESOCKTNOSUPPORT;
118 rcu_read_lock();
119 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
120
121 err = 0;
122 /* Check the non-wild match. */
123 if (protocol == answer->protocol) {
124 if (protocol != IPPROTO_IP)
125 break;
126 } else {
127 /* Check for the two wild cases. */
128 if (IPPROTO_IP == protocol) {
129 protocol = answer->protocol;
130 break;
131 }
132 if (IPPROTO_IP == answer->protocol)
133 break;
134 }
135 err = -EPROTONOSUPPORT;
136 }
137
138 if (err) {
139 if (try_loading_module < 2) {
140 rcu_read_unlock();
141 /*
142 * Be more specific, e.g. net-pf-10-proto-132-type-1
143 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
144 */
145 if (++try_loading_module == 1)
146 request_module("net-pf-%d-proto-%d-type-%d",
147 PF_INET6, protocol, sock->type);
148 /*
149 * Fall back to generic, e.g. net-pf-10-proto-132
150 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
151 */
152 else
153 request_module("net-pf-%d-proto-%d",
154 PF_INET6, protocol);
155 goto lookup_protocol;
156 } else
157 goto out_rcu_unlock;
158 }
159
160 err = -EPERM;
161 if (sock->type == SOCK_RAW && !capable(CAP_NET_RAW))
162 goto out_rcu_unlock;
163
164 sock->ops = answer->ops;
165 answer_prot = answer->prot;
166 answer_no_check = answer->no_check;
167 answer_flags = answer->flags;
168 rcu_read_unlock();
169
170 WARN_ON(answer_prot->slab == NULL);
171
172 err = -ENOBUFS;
173 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
174 if (sk == NULL)
175 goto out;
176
177 sock_init_data(sock, sk);
178
179 err = 0;
180 sk->sk_no_check = answer_no_check;
181 if (INET_PROTOSW_REUSE & answer_flags)
182 sk->sk_reuse = 1;
183
184 inet = inet_sk(sk);
185 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
186
187 if (SOCK_RAW == sock->type) {
188 inet->inet_num = protocol;
189 if (IPPROTO_RAW == protocol)
190 inet->hdrincl = 1;
191 }
192
193 sk->sk_destruct = inet_sock_destruct;
194 sk->sk_family = PF_INET6;
195 sk->sk_protocol = protocol;
196
197 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
198
199 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
200 np->hop_limit = -1;
201 np->mcast_hops = -1;
202 np->mc_loop = 1;
203 np->pmtudisc = IPV6_PMTUDISC_WANT;
204 np->ipv6only = net->ipv6.sysctl.bindv6only;
205
206 /* Init the ipv4 part of the socket since we can have sockets
207 * using v6 API for ipv4.
208 */
209 inet->uc_ttl = -1;
210
211 inet->mc_loop = 1;
212 inet->mc_ttl = 1;
213 inet->mc_index = 0;
214 inet->mc_list = NULL;
215
216 if (ipv4_config.no_pmtu_disc)
217 inet->pmtudisc = IP_PMTUDISC_DONT;
218 else
219 inet->pmtudisc = IP_PMTUDISC_WANT;
220 /*
221 * Increment only the relevant sk_prot->socks debug field, this changes
222 * the previous behaviour of incrementing both the equivalent to
223 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
224 *
225 * This allows better debug granularity as we'll know exactly how many
226 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
227 * transport protocol socks. -acme
228 */
229 sk_refcnt_debug_inc(sk);
230
231 if (inet->inet_num) {
232 /* It assumes that any protocol which allows
233 * the user to assign a number at socket
234 * creation time automatically shares.
235 */
236 inet->inet_sport = htons(inet->inet_num);
237 sk->sk_prot->hash(sk);
238 }
239 if (sk->sk_prot->init) {
240 err = sk->sk_prot->init(sk);
241 if (err) {
242 sk_common_release(sk);
243 goto out;
244 }
245 }
246 out:
247 return err;
248 out_rcu_unlock:
249 rcu_read_unlock();
250 goto out;
251 }
252
253
254 /* bind for INET6 API */
255 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
256 {
257 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
258 struct sock *sk = sock->sk;
259 struct inet_sock *inet = inet_sk(sk);
260 struct ipv6_pinfo *np = inet6_sk(sk);
261 struct net *net = sock_net(sk);
262 __be32 v4addr = 0;
263 unsigned short snum;
264 int addr_type = 0;
265 int err = 0;
266
267 /* If the socket has its own bind function then use it. */
268 if (sk->sk_prot->bind)
269 return sk->sk_prot->bind(sk, uaddr, addr_len);
270
271 if (addr_len < SIN6_LEN_RFC2133)
272 return -EINVAL;
273 addr_type = ipv6_addr_type(&addr->sin6_addr);
274 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
275 return -EINVAL;
276
277 snum = ntohs(addr->sin6_port);
278 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
279 return -EACCES;
280
281 lock_sock(sk);
282
283 /* Check these errors (active socket, double bind). */
284 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
285 err = -EINVAL;
286 goto out;
287 }
288
289 /* Check if the address belongs to the host. */
290 if (addr_type == IPV6_ADDR_MAPPED) {
291 int chk_addr_ret;
292
293 /* Binding to v4-mapped address on a v6-only socket
294 * makes no sense
295 */
296 if (np->ipv6only) {
297 err = -EINVAL;
298 goto out;
299 }
300
301 /* Reproduce AF_INET checks to make the bindings consitant */
302 v4addr = addr->sin6_addr.s6_addr32[3];
303 chk_addr_ret = inet_addr_type(net, v4addr);
304 if (!sysctl_ip_nonlocal_bind &&
305 !(inet->freebind || inet->transparent) &&
306 v4addr != htonl(INADDR_ANY) &&
307 chk_addr_ret != RTN_LOCAL &&
308 chk_addr_ret != RTN_MULTICAST &&
309 chk_addr_ret != RTN_BROADCAST) {
310 err = -EADDRNOTAVAIL;
311 goto out;
312 }
313 } else {
314 if (addr_type != IPV6_ADDR_ANY) {
315 struct net_device *dev = NULL;
316
317 rcu_read_lock();
318 if (addr_type & IPV6_ADDR_LINKLOCAL) {
319 if (addr_len >= sizeof(struct sockaddr_in6) &&
320 addr->sin6_scope_id) {
321 /* Override any existing binding, if another one
322 * is supplied by user.
323 */
324 sk->sk_bound_dev_if = addr->sin6_scope_id;
325 }
326
327 /* Binding to link-local address requires an interface */
328 if (!sk->sk_bound_dev_if) {
329 err = -EINVAL;
330 goto out_unlock;
331 }
332 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
333 if (!dev) {
334 err = -ENODEV;
335 goto out_unlock;
336 }
337 }
338
339 /* ipv4 addr of the socket is invalid. Only the
340 * unspecified and mapped address have a v4 equivalent.
341 */
342 v4addr = LOOPBACK4_IPV6;
343 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
344 if (!ipv6_chk_addr(net, &addr->sin6_addr,
345 dev, 0)) {
346 err = -EADDRNOTAVAIL;
347 goto out_unlock;
348 }
349 }
350 rcu_read_unlock();
351 }
352 }
353
354 inet->inet_rcv_saddr = v4addr;
355 inet->inet_saddr = v4addr;
356
357 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
358
359 if (!(addr_type & IPV6_ADDR_MULTICAST))
360 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
361
362 /* Make sure we are allowed to bind here. */
363 if (sk->sk_prot->get_port(sk, snum)) {
364 inet_reset_saddr(sk);
365 err = -EADDRINUSE;
366 goto out;
367 }
368
369 if (addr_type != IPV6_ADDR_ANY) {
370 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
371 if (addr_type != IPV6_ADDR_MAPPED)
372 np->ipv6only = 1;
373 }
374 if (snum)
375 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
376 inet->inet_sport = htons(inet->inet_num);
377 inet->inet_dport = 0;
378 inet->inet_daddr = 0;
379 out:
380 release_sock(sk);
381 return err;
382 out_unlock:
383 rcu_read_unlock();
384 goto out;
385 }
386
387 EXPORT_SYMBOL(inet6_bind);
388
389 int inet6_release(struct socket *sock)
390 {
391 struct sock *sk = sock->sk;
392
393 if (sk == NULL)
394 return -EINVAL;
395
396 /* Free mc lists */
397 ipv6_sock_mc_close(sk);
398
399 /* Free ac lists */
400 ipv6_sock_ac_close(sk);
401
402 return inet_release(sock);
403 }
404
405 EXPORT_SYMBOL(inet6_release);
406
407 void inet6_destroy_sock(struct sock *sk)
408 {
409 struct ipv6_pinfo *np = inet6_sk(sk);
410 struct sk_buff *skb;
411 struct ipv6_txoptions *opt;
412
413 /* Release rx options */
414
415 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
416 kfree_skb(skb);
417
418 /* Free flowlabels */
419 fl6_free_socklist(sk);
420
421 /* Free tx options */
422
423 if ((opt = xchg(&np->opt, NULL)) != NULL)
424 sock_kfree_s(sk, opt, opt->tot_len);
425 }
426
427 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
428
429 /*
430 * This does both peername and sockname.
431 */
432
433 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
434 int *uaddr_len, int peer)
435 {
436 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
437 struct sock *sk = sock->sk;
438 struct inet_sock *inet = inet_sk(sk);
439 struct ipv6_pinfo *np = inet6_sk(sk);
440
441 sin->sin6_family = AF_INET6;
442 sin->sin6_flowinfo = 0;
443 sin->sin6_scope_id = 0;
444 if (peer) {
445 if (!inet->inet_dport)
446 return -ENOTCONN;
447 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
448 peer == 1)
449 return -ENOTCONN;
450 sin->sin6_port = inet->inet_dport;
451 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
452 if (np->sndflow)
453 sin->sin6_flowinfo = np->flow_label;
454 } else {
455 if (ipv6_addr_any(&np->rcv_saddr))
456 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
457 else
458 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
459
460 sin->sin6_port = inet->inet_sport;
461 }
462 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
463 sin->sin6_scope_id = sk->sk_bound_dev_if;
464 *uaddr_len = sizeof(*sin);
465 return(0);
466 }
467
468 EXPORT_SYMBOL(inet6_getname);
469
470 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
471 {
472 struct sock *sk = sock->sk;
473 struct net *net = sock_net(sk);
474
475 switch(cmd)
476 {
477 case SIOCGSTAMP:
478 return sock_get_timestamp(sk, (struct timeval __user *)arg);
479
480 case SIOCGSTAMPNS:
481 return sock_get_timestampns(sk, (struct timespec __user *)arg);
482
483 case SIOCADDRT:
484 case SIOCDELRT:
485
486 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
487
488 case SIOCSIFADDR:
489 return addrconf_add_ifaddr(net, (void __user *) arg);
490 case SIOCDIFADDR:
491 return addrconf_del_ifaddr(net, (void __user *) arg);
492 case SIOCSIFDSTADDR:
493 return addrconf_set_dstaddr(net, (void __user *) arg);
494 default:
495 if (!sk->sk_prot->ioctl)
496 return -ENOIOCTLCMD;
497 return sk->sk_prot->ioctl(sk, cmd, arg);
498 }
499 /*NOTREACHED*/
500 return(0);
501 }
502
503 EXPORT_SYMBOL(inet6_ioctl);
504
505 const struct proto_ops inet6_stream_ops = {
506 .family = PF_INET6,
507 .owner = THIS_MODULE,
508 .release = inet6_release,
509 .bind = inet6_bind,
510 .connect = inet_stream_connect, /* ok */
511 .socketpair = sock_no_socketpair, /* a do nothing */
512 .accept = inet_accept, /* ok */
513 .getname = inet6_getname,
514 .poll = tcp_poll, /* ok */
515 .ioctl = inet6_ioctl, /* must change */
516 .listen = inet_listen, /* ok */
517 .shutdown = inet_shutdown, /* ok */
518 .setsockopt = sock_common_setsockopt, /* ok */
519 .getsockopt = sock_common_getsockopt, /* ok */
520 .sendmsg = tcp_sendmsg, /* ok */
521 .recvmsg = sock_common_recvmsg, /* ok */
522 .mmap = sock_no_mmap,
523 .sendpage = tcp_sendpage,
524 .splice_read = tcp_splice_read,
525 #ifdef CONFIG_COMPAT
526 .compat_setsockopt = compat_sock_common_setsockopt,
527 .compat_getsockopt = compat_sock_common_getsockopt,
528 #endif
529 };
530
531 const struct proto_ops inet6_dgram_ops = {
532 .family = PF_INET6,
533 .owner = THIS_MODULE,
534 .release = inet6_release,
535 .bind = inet6_bind,
536 .connect = inet_dgram_connect, /* ok */
537 .socketpair = sock_no_socketpair, /* a do nothing */
538 .accept = sock_no_accept, /* a do nothing */
539 .getname = inet6_getname,
540 .poll = udp_poll, /* ok */
541 .ioctl = inet6_ioctl, /* must change */
542 .listen = sock_no_listen, /* ok */
543 .shutdown = inet_shutdown, /* ok */
544 .setsockopt = sock_common_setsockopt, /* ok */
545 .getsockopt = sock_common_getsockopt, /* ok */
546 .sendmsg = inet_sendmsg, /* ok */
547 .recvmsg = sock_common_recvmsg, /* ok */
548 .mmap = sock_no_mmap,
549 .sendpage = sock_no_sendpage,
550 #ifdef CONFIG_COMPAT
551 .compat_setsockopt = compat_sock_common_setsockopt,
552 .compat_getsockopt = compat_sock_common_getsockopt,
553 #endif
554 };
555
556 static const struct net_proto_family inet6_family_ops = {
557 .family = PF_INET6,
558 .create = inet6_create,
559 .owner = THIS_MODULE,
560 };
561
562 int inet6_register_protosw(struct inet_protosw *p)
563 {
564 struct list_head *lh;
565 struct inet_protosw *answer;
566 struct list_head *last_perm;
567 int protocol = p->protocol;
568 int ret;
569
570 spin_lock_bh(&inetsw6_lock);
571
572 ret = -EINVAL;
573 if (p->type >= SOCK_MAX)
574 goto out_illegal;
575
576 /* If we are trying to override a permanent protocol, bail. */
577 answer = NULL;
578 ret = -EPERM;
579 last_perm = &inetsw6[p->type];
580 list_for_each(lh, &inetsw6[p->type]) {
581 answer = list_entry(lh, struct inet_protosw, list);
582
583 /* Check only the non-wild match. */
584 if (INET_PROTOSW_PERMANENT & answer->flags) {
585 if (protocol == answer->protocol)
586 break;
587 last_perm = lh;
588 }
589
590 answer = NULL;
591 }
592 if (answer)
593 goto out_permanent;
594
595 /* Add the new entry after the last permanent entry if any, so that
596 * the new entry does not override a permanent entry when matched with
597 * a wild-card protocol. But it is allowed to override any existing
598 * non-permanent entry. This means that when we remove this entry, the
599 * system automatically returns to the old behavior.
600 */
601 list_add_rcu(&p->list, last_perm);
602 ret = 0;
603 out:
604 spin_unlock_bh(&inetsw6_lock);
605 return ret;
606
607 out_permanent:
608 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
609 protocol);
610 goto out;
611
612 out_illegal:
613 printk(KERN_ERR
614 "Ignoring attempt to register invalid socket type %d.\n",
615 p->type);
616 goto out;
617 }
618
619 EXPORT_SYMBOL(inet6_register_protosw);
620
621 void
622 inet6_unregister_protosw(struct inet_protosw *p)
623 {
624 if (INET_PROTOSW_PERMANENT & p->flags) {
625 printk(KERN_ERR
626 "Attempt to unregister permanent protocol %d.\n",
627 p->protocol);
628 } else {
629 spin_lock_bh(&inetsw6_lock);
630 list_del_rcu(&p->list);
631 spin_unlock_bh(&inetsw6_lock);
632
633 synchronize_net();
634 }
635 }
636
637 EXPORT_SYMBOL(inet6_unregister_protosw);
638
639 int inet6_sk_rebuild_header(struct sock *sk)
640 {
641 int err;
642 struct dst_entry *dst;
643 struct ipv6_pinfo *np = inet6_sk(sk);
644
645 dst = __sk_dst_check(sk, np->dst_cookie);
646
647 if (dst == NULL) {
648 struct inet_sock *inet = inet_sk(sk);
649 struct in6_addr *final_p = NULL, final;
650 struct flowi fl;
651
652 memset(&fl, 0, sizeof(fl));
653 fl.proto = sk->sk_protocol;
654 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
655 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
656 fl.fl6_flowlabel = np->flow_label;
657 fl.oif = sk->sk_bound_dev_if;
658 fl.mark = sk->sk_mark;
659 fl.fl_ip_dport = inet->inet_dport;
660 fl.fl_ip_sport = inet->inet_sport;
661 security_sk_classify_flow(sk, &fl);
662
663 if (np->opt && np->opt->srcrt) {
664 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
665 ipv6_addr_copy(&final, &fl.fl6_dst);
666 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
667 final_p = &final;
668 }
669
670 err = ip6_dst_lookup(sk, &dst, &fl);
671 if (err) {
672 sk->sk_route_caps = 0;
673 return err;
674 }
675 if (final_p)
676 ipv6_addr_copy(&fl.fl6_dst, final_p);
677
678 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
679 sk->sk_err_soft = -err;
680 return err;
681 }
682
683 __ip6_dst_store(sk, dst, NULL, NULL);
684 }
685
686 return 0;
687 }
688
689 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
690
691 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
692 {
693 struct ipv6_pinfo *np = inet6_sk(sk);
694 struct inet6_skb_parm *opt = IP6CB(skb);
695
696 if (np->rxopt.all) {
697 if ((opt->hop && (np->rxopt.bits.hopopts ||
698 np->rxopt.bits.ohopopts)) ||
699 ((IPV6_FLOWINFO_MASK &
700 *(__be32 *)skb_network_header(skb)) &&
701 np->rxopt.bits.rxflow) ||
702 (opt->srcrt && (np->rxopt.bits.srcrt ||
703 np->rxopt.bits.osrcrt)) ||
704 ((opt->dst1 || opt->dst0) &&
705 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
706 return 1;
707 }
708 return 0;
709 }
710
711 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
712
713 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
714 {
715 const struct inet6_protocol *ops = NULL;
716
717 for (;;) {
718 struct ipv6_opt_hdr *opth;
719 int len;
720
721 if (proto != NEXTHDR_HOP) {
722 ops = rcu_dereference(inet6_protos[proto]);
723
724 if (unlikely(!ops))
725 break;
726
727 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
728 break;
729 }
730
731 if (unlikely(!pskb_may_pull(skb, 8)))
732 break;
733
734 opth = (void *)skb->data;
735 len = ipv6_optlen(opth);
736
737 if (unlikely(!pskb_may_pull(skb, len)))
738 break;
739
740 proto = opth->nexthdr;
741 __skb_pull(skb, len);
742 }
743
744 return proto;
745 }
746
747 static int ipv6_gso_send_check(struct sk_buff *skb)
748 {
749 struct ipv6hdr *ipv6h;
750 const struct inet6_protocol *ops;
751 int err = -EINVAL;
752
753 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
754 goto out;
755
756 ipv6h = ipv6_hdr(skb);
757 __skb_pull(skb, sizeof(*ipv6h));
758 err = -EPROTONOSUPPORT;
759
760 rcu_read_lock();
761 ops = rcu_dereference(inet6_protos[
762 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
763
764 if (likely(ops && ops->gso_send_check)) {
765 skb_reset_transport_header(skb);
766 err = ops->gso_send_check(skb);
767 }
768 rcu_read_unlock();
769
770 out:
771 return err;
772 }
773
774 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
775 {
776 struct sk_buff *segs = ERR_PTR(-EINVAL);
777 struct ipv6hdr *ipv6h;
778 const struct inet6_protocol *ops;
779 int proto;
780 struct frag_hdr *fptr;
781 unsigned int unfrag_ip6hlen;
782 u8 *prevhdr;
783 int offset = 0;
784
785 if (!(features & NETIF_F_V6_CSUM))
786 features &= ~NETIF_F_SG;
787
788 if (unlikely(skb_shinfo(skb)->gso_type &
789 ~(SKB_GSO_UDP |
790 SKB_GSO_DODGY |
791 SKB_GSO_TCP_ECN |
792 SKB_GSO_TCPV6 |
793 0)))
794 goto out;
795
796 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
797 goto out;
798
799 ipv6h = ipv6_hdr(skb);
800 __skb_pull(skb, sizeof(*ipv6h));
801 segs = ERR_PTR(-EPROTONOSUPPORT);
802
803 proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
804 rcu_read_lock();
805 ops = rcu_dereference(inet6_protos[proto]);
806 if (likely(ops && ops->gso_segment)) {
807 skb_reset_transport_header(skb);
808 segs = ops->gso_segment(skb, features);
809 }
810 rcu_read_unlock();
811
812 if (unlikely(IS_ERR(segs)))
813 goto out;
814
815 for (skb = segs; skb; skb = skb->next) {
816 ipv6h = ipv6_hdr(skb);
817 ipv6h->payload_len = htons(skb->len - skb->mac_len -
818 sizeof(*ipv6h));
819 if (proto == IPPROTO_UDP) {
820 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
821 fptr = (struct frag_hdr *)(skb_network_header(skb) +
822 unfrag_ip6hlen);
823 fptr->frag_off = htons(offset);
824 if (skb->next != NULL)
825 fptr->frag_off |= htons(IP6_MF);
826 offset += (ntohs(ipv6h->payload_len) -
827 sizeof(struct frag_hdr));
828 }
829 }
830
831 out:
832 return segs;
833 }
834
835 struct ipv6_gro_cb {
836 struct napi_gro_cb napi;
837 int proto;
838 };
839
840 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
841
842 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
843 struct sk_buff *skb)
844 {
845 const struct inet6_protocol *ops;
846 struct sk_buff **pp = NULL;
847 struct sk_buff *p;
848 struct ipv6hdr *iph;
849 unsigned int nlen;
850 unsigned int hlen;
851 unsigned int off;
852 int flush = 1;
853 int proto;
854 __wsum csum;
855
856 off = skb_gro_offset(skb);
857 hlen = off + sizeof(*iph);
858 iph = skb_gro_header_fast(skb, off);
859 if (skb_gro_header_hard(skb, hlen)) {
860 iph = skb_gro_header_slow(skb, hlen, off);
861 if (unlikely(!iph))
862 goto out;
863 }
864
865 skb_gro_pull(skb, sizeof(*iph));
866 skb_set_transport_header(skb, skb_gro_offset(skb));
867
868 flush += ntohs(iph->payload_len) != skb_gro_len(skb);
869
870 rcu_read_lock();
871 proto = iph->nexthdr;
872 ops = rcu_dereference(inet6_protos[proto]);
873 if (!ops || !ops->gro_receive) {
874 __pskb_pull(skb, skb_gro_offset(skb));
875 proto = ipv6_gso_pull_exthdrs(skb, proto);
876 skb_gro_pull(skb, -skb_transport_offset(skb));
877 skb_reset_transport_header(skb);
878 __skb_push(skb, skb_gro_offset(skb));
879
880 if (!ops || !ops->gro_receive)
881 goto out_unlock;
882
883 iph = ipv6_hdr(skb);
884 }
885
886 IPV6_GRO_CB(skb)->proto = proto;
887
888 flush--;
889 nlen = skb_network_header_len(skb);
890
891 for (p = *head; p; p = p->next) {
892 struct ipv6hdr *iph2;
893
894 if (!NAPI_GRO_CB(p)->same_flow)
895 continue;
896
897 iph2 = ipv6_hdr(p);
898
899 /* All fields must match except length. */
900 if (nlen != skb_network_header_len(p) ||
901 memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
902 memcmp(&iph->nexthdr, &iph2->nexthdr,
903 nlen - offsetof(struct ipv6hdr, nexthdr))) {
904 NAPI_GRO_CB(p)->same_flow = 0;
905 continue;
906 }
907
908 NAPI_GRO_CB(p)->flush |= flush;
909 }
910
911 NAPI_GRO_CB(skb)->flush |= flush;
912
913 csum = skb->csum;
914 skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
915
916 pp = ops->gro_receive(head, skb);
917
918 skb->csum = csum;
919
920 out_unlock:
921 rcu_read_unlock();
922
923 out:
924 NAPI_GRO_CB(skb)->flush |= flush;
925
926 return pp;
927 }
928
929 static int ipv6_gro_complete(struct sk_buff *skb)
930 {
931 const struct inet6_protocol *ops;
932 struct ipv6hdr *iph = ipv6_hdr(skb);
933 int err = -ENOSYS;
934
935 iph->payload_len = htons(skb->len - skb_network_offset(skb) -
936 sizeof(*iph));
937
938 rcu_read_lock();
939 ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
940 if (WARN_ON(!ops || !ops->gro_complete))
941 goto out_unlock;
942
943 err = ops->gro_complete(skb);
944
945 out_unlock:
946 rcu_read_unlock();
947
948 return err;
949 }
950
951 static struct packet_type ipv6_packet_type __read_mostly = {
952 .type = cpu_to_be16(ETH_P_IPV6),
953 .func = ipv6_rcv,
954 .gso_send_check = ipv6_gso_send_check,
955 .gso_segment = ipv6_gso_segment,
956 .gro_receive = ipv6_gro_receive,
957 .gro_complete = ipv6_gro_complete,
958 };
959
960 static int __init ipv6_packet_init(void)
961 {
962 dev_add_pack(&ipv6_packet_type);
963 return 0;
964 }
965
966 static void ipv6_packet_cleanup(void)
967 {
968 dev_remove_pack(&ipv6_packet_type);
969 }
970
971 static int __net_init ipv6_init_mibs(struct net *net)
972 {
973 if (snmp_mib_init((void **)net->mib.udp_stats_in6,
974 sizeof (struct udp_mib)) < 0)
975 return -ENOMEM;
976 if (snmp_mib_init((void **)net->mib.udplite_stats_in6,
977 sizeof (struct udp_mib)) < 0)
978 goto err_udplite_mib;
979 if (snmp_mib_init((void **)net->mib.ipv6_statistics,
980 sizeof(struct ipstats_mib)) < 0)
981 goto err_ip_mib;
982 if (snmp_mib_init((void **)net->mib.icmpv6_statistics,
983 sizeof(struct icmpv6_mib)) < 0)
984 goto err_icmp_mib;
985 if (snmp_mib_init((void **)net->mib.icmpv6msg_statistics,
986 sizeof(struct icmpv6msg_mib)) < 0)
987 goto err_icmpmsg_mib;
988 return 0;
989
990 err_icmpmsg_mib:
991 snmp_mib_free((void **)net->mib.icmpv6_statistics);
992 err_icmp_mib:
993 snmp_mib_free((void **)net->mib.ipv6_statistics);
994 err_ip_mib:
995 snmp_mib_free((void **)net->mib.udplite_stats_in6);
996 err_udplite_mib:
997 snmp_mib_free((void **)net->mib.udp_stats_in6);
998 return -ENOMEM;
999 }
1000
1001 static void __net_exit ipv6_cleanup_mibs(struct net *net)
1002 {
1003 snmp_mib_free((void **)net->mib.udp_stats_in6);
1004 snmp_mib_free((void **)net->mib.udplite_stats_in6);
1005 snmp_mib_free((void **)net->mib.ipv6_statistics);
1006 snmp_mib_free((void **)net->mib.icmpv6_statistics);
1007 snmp_mib_free((void **)net->mib.icmpv6msg_statistics);
1008 }
1009
1010 static int __net_init inet6_net_init(struct net *net)
1011 {
1012 int err = 0;
1013
1014 net->ipv6.sysctl.bindv6only = 0;
1015 net->ipv6.sysctl.icmpv6_time = 1*HZ;
1016
1017 err = ipv6_init_mibs(net);
1018 if (err)
1019 return err;
1020 #ifdef CONFIG_PROC_FS
1021 err = udp6_proc_init(net);
1022 if (err)
1023 goto out;
1024 err = tcp6_proc_init(net);
1025 if (err)
1026 goto proc_tcp6_fail;
1027 err = ac6_proc_init(net);
1028 if (err)
1029 goto proc_ac6_fail;
1030 #endif
1031 return err;
1032
1033 #ifdef CONFIG_PROC_FS
1034 proc_ac6_fail:
1035 tcp6_proc_exit(net);
1036 proc_tcp6_fail:
1037 udp6_proc_exit(net);
1038 out:
1039 ipv6_cleanup_mibs(net);
1040 return err;
1041 #endif
1042 }
1043
1044 static void inet6_net_exit(struct net *net)
1045 {
1046 #ifdef CONFIG_PROC_FS
1047 udp6_proc_exit(net);
1048 tcp6_proc_exit(net);
1049 ac6_proc_exit(net);
1050 #endif
1051 ipv6_cleanup_mibs(net);
1052 }
1053
1054 static struct pernet_operations inet6_net_ops = {
1055 .init = inet6_net_init,
1056 .exit = inet6_net_exit,
1057 };
1058
1059 static int __init inet6_init(void)
1060 {
1061 struct sk_buff *dummy_skb;
1062 struct list_head *r;
1063 int err = 0;
1064
1065 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1066
1067 /* Register the socket-side information for inet6_create. */
1068 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1069 INIT_LIST_HEAD(r);
1070
1071 if (disable_ipv6_mod) {
1072 printk(KERN_INFO
1073 "IPv6: Loaded, but administratively disabled, "
1074 "reboot required to enable\n");
1075 goto out;
1076 }
1077
1078 err = proto_register(&tcpv6_prot, 1);
1079 if (err)
1080 goto out;
1081
1082 err = proto_register(&udpv6_prot, 1);
1083 if (err)
1084 goto out_unregister_tcp_proto;
1085
1086 err = proto_register(&udplitev6_prot, 1);
1087 if (err)
1088 goto out_unregister_udp_proto;
1089
1090 err = proto_register(&rawv6_prot, 1);
1091 if (err)
1092 goto out_unregister_udplite_proto;
1093
1094
1095 /* We MUST register RAW sockets before we create the ICMP6,
1096 * IGMP6, or NDISC control sockets.
1097 */
1098 err = rawv6_init();
1099 if (err)
1100 goto out_unregister_raw_proto;
1101
1102 /* Register the family here so that the init calls below will
1103 * be able to create sockets. (?? is this dangerous ??)
1104 */
1105 err = sock_register(&inet6_family_ops);
1106 if (err)
1107 goto out_sock_register_fail;
1108
1109 #ifdef CONFIG_SYSCTL
1110 err = ipv6_static_sysctl_register();
1111 if (err)
1112 goto static_sysctl_fail;
1113 #endif
1114 /*
1115 * ipngwg API draft makes clear that the correct semantics
1116 * for TCP and UDP is to consider one TCP and UDP instance
1117 * in a host availiable by both INET and INET6 APIs and
1118 * able to communicate via both network protocols.
1119 */
1120
1121 err = register_pernet_subsys(&inet6_net_ops);
1122 if (err)
1123 goto register_pernet_fail;
1124 err = icmpv6_init();
1125 if (err)
1126 goto icmp_fail;
1127 err = ip6_mr_init();
1128 if (err)
1129 goto ipmr_fail;
1130 err = ndisc_init();
1131 if (err)
1132 goto ndisc_fail;
1133 err = igmp6_init();
1134 if (err)
1135 goto igmp_fail;
1136 err = ipv6_netfilter_init();
1137 if (err)
1138 goto netfilter_fail;
1139 /* Create /proc/foo6 entries. */
1140 #ifdef CONFIG_PROC_FS
1141 err = -ENOMEM;
1142 if (raw6_proc_init())
1143 goto proc_raw6_fail;
1144 if (udplite6_proc_init())
1145 goto proc_udplite6_fail;
1146 if (ipv6_misc_proc_init())
1147 goto proc_misc6_fail;
1148 if (if6_proc_init())
1149 goto proc_if6_fail;
1150 #endif
1151 err = ip6_route_init();
1152 if (err)
1153 goto ip6_route_fail;
1154 err = ip6_flowlabel_init();
1155 if (err)
1156 goto ip6_flowlabel_fail;
1157 err = addrconf_init();
1158 if (err)
1159 goto addrconf_fail;
1160
1161 /* Init v6 extension headers. */
1162 err = ipv6_exthdrs_init();
1163 if (err)
1164 goto ipv6_exthdrs_fail;
1165
1166 err = ipv6_frag_init();
1167 if (err)
1168 goto ipv6_frag_fail;
1169
1170 /* Init v6 transport protocols. */
1171 err = udpv6_init();
1172 if (err)
1173 goto udpv6_fail;
1174
1175 err = udplitev6_init();
1176 if (err)
1177 goto udplitev6_fail;
1178
1179 err = tcpv6_init();
1180 if (err)
1181 goto tcpv6_fail;
1182
1183 err = ipv6_packet_init();
1184 if (err)
1185 goto ipv6_packet_fail;
1186
1187 #ifdef CONFIG_SYSCTL
1188 err = ipv6_sysctl_register();
1189 if (err)
1190 goto sysctl_fail;
1191 #endif
1192 out:
1193 return err;
1194
1195 #ifdef CONFIG_SYSCTL
1196 sysctl_fail:
1197 ipv6_packet_cleanup();
1198 #endif
1199 ipv6_packet_fail:
1200 tcpv6_exit();
1201 tcpv6_fail:
1202 udplitev6_exit();
1203 udplitev6_fail:
1204 udpv6_exit();
1205 udpv6_fail:
1206 ipv6_frag_exit();
1207 ipv6_frag_fail:
1208 ipv6_exthdrs_exit();
1209 ipv6_exthdrs_fail:
1210 addrconf_cleanup();
1211 addrconf_fail:
1212 ip6_flowlabel_cleanup();
1213 ip6_flowlabel_fail:
1214 ip6_route_cleanup();
1215 ip6_route_fail:
1216 #ifdef CONFIG_PROC_FS
1217 if6_proc_exit();
1218 proc_if6_fail:
1219 ipv6_misc_proc_exit();
1220 proc_misc6_fail:
1221 udplite6_proc_exit();
1222 proc_udplite6_fail:
1223 raw6_proc_exit();
1224 proc_raw6_fail:
1225 #endif
1226 ipv6_netfilter_fini();
1227 netfilter_fail:
1228 igmp6_cleanup();
1229 igmp_fail:
1230 ndisc_cleanup();
1231 ndisc_fail:
1232 ip6_mr_cleanup();
1233 ipmr_fail:
1234 icmpv6_cleanup();
1235 icmp_fail:
1236 unregister_pernet_subsys(&inet6_net_ops);
1237 register_pernet_fail:
1238 #ifdef CONFIG_SYSCTL
1239 ipv6_static_sysctl_unregister();
1240 static_sysctl_fail:
1241 #endif
1242 sock_unregister(PF_INET6);
1243 rtnl_unregister_all(PF_INET6);
1244 out_sock_register_fail:
1245 rawv6_exit();
1246 out_unregister_raw_proto:
1247 proto_unregister(&rawv6_prot);
1248 out_unregister_udplite_proto:
1249 proto_unregister(&udplitev6_prot);
1250 out_unregister_udp_proto:
1251 proto_unregister(&udpv6_prot);
1252 out_unregister_tcp_proto:
1253 proto_unregister(&tcpv6_prot);
1254 goto out;
1255 }
1256 module_init(inet6_init);
1257
1258 static void __exit inet6_exit(void)
1259 {
1260 if (disable_ipv6_mod)
1261 return;
1262
1263 /* First of all disallow new sockets creation. */
1264 sock_unregister(PF_INET6);
1265 /* Disallow any further netlink messages */
1266 rtnl_unregister_all(PF_INET6);
1267
1268 #ifdef CONFIG_SYSCTL
1269 ipv6_sysctl_unregister();
1270 #endif
1271 udpv6_exit();
1272 udplitev6_exit();
1273 tcpv6_exit();
1274
1275 /* Cleanup code parts. */
1276 ipv6_packet_cleanup();
1277 ipv6_frag_exit();
1278 ipv6_exthdrs_exit();
1279 addrconf_cleanup();
1280 ip6_flowlabel_cleanup();
1281 ip6_route_cleanup();
1282 #ifdef CONFIG_PROC_FS
1283
1284 /* Cleanup code parts. */
1285 if6_proc_exit();
1286 ipv6_misc_proc_exit();
1287 udplite6_proc_exit();
1288 raw6_proc_exit();
1289 #endif
1290 ipv6_netfilter_fini();
1291 igmp6_cleanup();
1292 ndisc_cleanup();
1293 ip6_mr_cleanup();
1294 icmpv6_cleanup();
1295 rawv6_exit();
1296
1297 unregister_pernet_subsys(&inet6_net_ops);
1298 #ifdef CONFIG_SYSCTL
1299 ipv6_static_sysctl_unregister();
1300 #endif
1301 proto_unregister(&rawv6_prot);
1302 proto_unregister(&udplitev6_prot);
1303 proto_unregister(&udpv6_prot);
1304 proto_unregister(&tcpv6_prot);
1305
1306 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1307 }
1308 module_exit(inet6_exit);
1309
1310 MODULE_ALIAS_NETPROTO(PF_INET6);
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