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[PATCH] node-aware skb allocation
[linux-2.6-block.git] / net / ipv6 / af_inet6.c
CommitLineData
1da177e4
LT		 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 * $Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $
11 *
12 * Fixes:
13 * piggy, Karl Knutson : Socket protocol table
14 * Hideaki YOSHIFUJI : sin6_scope_id support
15 * Arnaldo Melo : check proc_net_create return, cleanups
16 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version
20 * 2 of the License, or (at your option) any later version.
21 */
22
23
24#include <linux/module.h>
4fc268d2 25#include <linux/capability.h>
1da177e4
LT		 26#include <linux/errno.h>
27#include <linux/types.h>
28#include <linux/socket.h>
29#include <linux/in.h>
30#include <linux/kernel.h>
1da177e4
LT		 31#include <linux/sched.h>
32#include <linux/timer.h>
33#include <linux/string.h>
34#include <linux/sockios.h>
35#include <linux/net.h>
36#include <linux/fcntl.h>
37#include <linux/mm.h>
38#include <linux/interrupt.h>
39#include <linux/proc_fs.h>
40#include <linux/stat.h>
41#include <linux/init.h>
42
43#include <linux/inet.h>
44#include <linux/netdevice.h>
45#include <linux/icmpv6.h>
46#include <linux/smp_lock.h>
2cc7d573 47#include <linux/netfilter_ipv6.h>
1da177e4
LT		 48
49#include <net/ip.h>
50#include <net/ipv6.h>
51#include <net/udp.h>
ba4e58ec 52#include <net/udplite.h>
1da177e4
LT		 53#include <net/tcp.h>
54#include <net/ipip.h>
55#include <net/protocol.h>
56#include <net/inet_common.h>
57#include <net/transp_v6.h>
58#include <net/ip6_route.h>
59#include <net/addrconf.h>
60#ifdef CONFIG_IPV6_TUNNEL
61#include <net/ip6_tunnel.h>
62#endif
2c8d7ca0
NT		 63#ifdef CONFIG_IPV6_MIP6
64#include <net/mip6.h>
65#endif
1da177e4
LT		 66
67#include <asm/uaccess.h>
68#include <asm/system.h>
69
70MODULE_AUTHOR("Cast of dozens");
71MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
72MODULE_LICENSE("GPL");
73
ab32ea5d 74int sysctl_ipv6_bindv6only __read_mostly;
1da177e4 75
1da177e4
LT		 76/* The inetsw table contains everything that inet_create needs to
77 * build a new socket.
78 */
79static struct list_head inetsw6[SOCK_MAX];
80static DEFINE_SPINLOCK(inetsw6_lock);
81
1da177e4
LT		 82static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
83{
84 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
85
86 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
87}
88
89static int inet6_create(struct socket *sock, int protocol)
90{
91 struct inet_sock *inet;
92 struct ipv6_pinfo *np;
93 struct sock *sk;
94 struct list_head *p;
95 struct inet_protosw *answer;
96 struct proto *answer_prot;
97 unsigned char answer_flags;
98 char answer_no_check;
af1afe86
YH		 99 int try_loading_module = 0;
100 int err;
1da177e4
LT		 101
102 /* Look for the requested type/protocol pair. */
103 answer = NULL;
af1afe86
YH		 104lookup_protocol:
105 err = -ESOCKTNOSUPPORT;
1da177e4
LT		 106 rcu_read_lock();
107 list_for_each_rcu(p, &inetsw6[sock->type]) {
108 answer = list_entry(p, struct inet_protosw, list);
109
110 /* Check the non-wild match. */
111 if (protocol == answer->protocol) {
112 if (protocol != IPPROTO_IP)
113 break;
114 } else {
115 /* Check for the two wild cases. */
116 if (IPPROTO_IP == protocol) {
117 protocol = answer->protocol;
118 break;
119 }
120 if (IPPROTO_IP == answer->protocol)
121 break;
122 }
af1afe86 123 err = -EPROTONOSUPPORT;
1da177e4
LT		 124 answer = NULL;
125 }
126
af1afe86
YH		 127 if (!answer) {
128 if (try_loading_module < 2) {
129 rcu_read_unlock();
130 /*
131 * Be more specific, e.g. net-pf-10-proto-132-type-1
132 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
133 */
134 if (++try_loading_module == 1)
135 request_module("net-pf-%d-proto-%d-type-%d",
136 PF_INET6, protocol, sock->type);
137 /*
138 * Fall back to generic, e.g. net-pf-10-proto-132
139 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
140 */
141 else
142 request_module("net-pf-%d-proto-%d",
143 PF_INET6, protocol);
144 goto lookup_protocol;
145 } else
146 goto out_rcu_unlock;
147 }
148
149 err = -EPERM;
1da177e4
LT		 150 if (answer->capability > 0 && !capable(answer->capability))
151 goto out_rcu_unlock;
1da177e4
LT		 152
153 sock->ops = answer->ops;
1da177e4
LT		 154 answer_prot = answer->prot;
155 answer_no_check = answer->no_check;
156 answer_flags = answer->flags;
157 rcu_read_unlock();
158
159 BUG_TRAP(answer_prot->slab != NULL);
160
af1afe86 161 err = -ENOBUFS;
1da177e4
LT		 162 sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
163 if (sk == NULL)
164 goto out;
165
166 sock_init_data(sock, sk);
167
af1afe86 168 err = 0;
1da177e4
LT		 169 sk->sk_no_check = answer_no_check;
170 if (INET_PROTOSW_REUSE & answer_flags)
171 sk->sk_reuse = 1;
172
173 inet = inet_sk(sk);
d83d8461 174 inet->is_icsk = INET_PROTOSW_ICSK & answer_flags;
1da177e4
LT		 175
176 if (SOCK_RAW == sock->type) {
177 inet->num = protocol;
178 if (IPPROTO_RAW == protocol)
179 inet->hdrincl = 1;
180 }
181
e6848976 182 sk->sk_destruct = inet_sock_destruct;
1da177e4
LT		 183 sk->sk_family = PF_INET6;
184 sk->sk_protocol = protocol;
185
186 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
187
188 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
189 np->hop_limit = -1;
190 np->mcast_hops = -1;
191 np->mc_loop = 1;
192 np->pmtudisc = IPV6_PMTUDISC_WANT;
193 np->ipv6only = sysctl_ipv6_bindv6only;
194
195 /* Init the ipv4 part of the socket since we can have sockets
196 * using v6 API for ipv4.
197 */
198 inet->uc_ttl = -1;
199
200 inet->mc_loop = 1;
201 inet->mc_ttl = 1;
202 inet->mc_index = 0;
203 inet->mc_list = NULL;
204
205 if (ipv4_config.no_pmtu_disc)
206 inet->pmtudisc = IP_PMTUDISC_DONT;
207 else
208 inet->pmtudisc = IP_PMTUDISC_WANT;
e6848976
ACM		 209 /*
210 * Increment only the relevant sk_prot->socks debug field, this changes
211 * the previous behaviour of incrementing both the equivalent to
212 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
213 *
214 * This allows better debug granularity as we'll know exactly how many
215 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
216 * transport protocol socks. -acme
217 */
218 sk_refcnt_debug_inc(sk);
1da177e4 219
1da177e4
LT		 220 if (inet->num) {
221 /* It assumes that any protocol which allows
222 * the user to assign a number at socket
223 * creation time automatically shares.
224 */
e69a4adc 225 inet->sport = htons(inet->num);
1da177e4
LT		 226 sk->sk_prot->hash(sk);
227 }
228 if (sk->sk_prot->init) {
af1afe86
YH		 229 err = sk->sk_prot->init(sk);
230 if (err) {
1da177e4
LT		 231 sk_common_release(sk);
232 goto out;
233 }
234 }
235out:
af1afe86 236 return err;
1da177e4
LT		 237out_rcu_unlock:
238 rcu_read_unlock();
239 goto out;
240}
241
242
243/* bind for INET6 API */
244int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
245{
246 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
247 struct sock *sk = sock->sk;
248 struct inet_sock *inet = inet_sk(sk);
249 struct ipv6_pinfo *np = inet6_sk(sk);
fd683222 250 __be32 v4addr = 0;
1da177e4
LT		 251 unsigned short snum;
252 int addr_type = 0;
253 int err = 0;
254
255 /* If the socket has its own bind function then use it. */
256 if (sk->sk_prot->bind)
257 return sk->sk_prot->bind(sk, uaddr, addr_len);
258
259 if (addr_len < SIN6_LEN_RFC2133)
260 return -EINVAL;
261 addr_type = ipv6_addr_type(&addr->sin6_addr);
262 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
263 return -EINVAL;
264
265 snum = ntohs(addr->sin6_port);
266 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
267 return -EACCES;
268
269 lock_sock(sk);
270
271 /* Check these errors (active socket, double bind). */
272 if (sk->sk_state != TCP_CLOSE || inet->num) {
273 err = -EINVAL;
274 goto out;
275 }
276
277 /* Check if the address belongs to the host. */
278 if (addr_type == IPV6_ADDR_MAPPED) {
279 v4addr = addr->sin6_addr.s6_addr32[3];
280 if (inet_addr_type(v4addr) != RTN_LOCAL) {
281 err = -EADDRNOTAVAIL;
282 goto out;
283 }
284 } else {
285 if (addr_type != IPV6_ADDR_ANY) {
286 struct net_device *dev = NULL;
287
288 if (addr_type & IPV6_ADDR_LINKLOCAL) {
289 if (addr_len >= sizeof(struct sockaddr_in6) &&
290 addr->sin6_scope_id) {
291 /* Override any existing binding, if another one
292 * is supplied by user.
293 */
294 sk->sk_bound_dev_if = addr->sin6_scope_id;
295 }
296
297 /* Binding to link-local address requires an interface */
298 if (!sk->sk_bound_dev_if) {
299 err = -EINVAL;
300 goto out;
301 }
302 dev = dev_get_by_index(sk->sk_bound_dev_if);
303 if (!dev) {
304 err = -ENODEV;
305 goto out;
306 }
307 }
308
309 /* ipv4 addr of the socket is invalid. Only the
310 * unspecified and mapped address have a v4 equivalent.
311 */
312 v4addr = LOOPBACK4_IPV6;
313 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
314 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
315 if (dev)
316 dev_put(dev);
317 err = -EADDRNOTAVAIL;
318 goto out;
319 }
320 }
321 if (dev)
322 dev_put(dev);
323 }
324 }
325
326 inet->rcv_saddr = v4addr;
327 inet->saddr = v4addr;
328
329 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
330
331 if (!(addr_type & IPV6_ADDR_MULTICAST))
332 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
333
334 /* Make sure we are allowed to bind here. */
335 if (sk->sk_prot->get_port(sk, snum)) {
336 inet_reset_saddr(sk);
337 err = -EADDRINUSE;
338 goto out;
339 }
340
341 if (addr_type != IPV6_ADDR_ANY)
342 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
343 if (snum)
344 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
e69a4adc 345 inet->sport = htons(inet->num);
1da177e4
LT		 346 inet->dport = 0;
347 inet->daddr = 0;
348out:
349 release_sock(sk);
350 return err;
351}
352
353int inet6_release(struct socket *sock)
354{
355 struct sock *sk = sock->sk;
356
357 if (sk == NULL)
358 return -EINVAL;
359
360 /* Free mc lists */
361 ipv6_sock_mc_close(sk);
362
363 /* Free ac lists */
364 ipv6_sock_ac_close(sk);
365
366 return inet_release(sock);
367}
368
369int inet6_destroy_sock(struct sock *sk)
370{
371 struct ipv6_pinfo *np = inet6_sk(sk);
372 struct sk_buff *skb;
373 struct ipv6_txoptions *opt;
374
1da177e4
LT		 375 /* Release rx options */
376
377 if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
378 kfree_skb(skb);
379
380 /* Free flowlabels */
381 fl6_free_socklist(sk);
382
383 /* Free tx options */
384
385 if ((opt = xchg(&np->opt, NULL)) != NULL)
386 sock_kfree_s(sk, opt, opt->tot_len);
387
388 return 0;
389}
390
3cf3dc6c
ACM		 391EXPORT_SYMBOL_GPL(inet6_destroy_sock);
392
1da177e4
LT		 393/*
394 * This does both peername and sockname.
395 */
396
397int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
398 int *uaddr_len, int peer)
399{
400 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
401 struct sock *sk = sock->sk;
402 struct inet_sock *inet = inet_sk(sk);
403 struct ipv6_pinfo *np = inet6_sk(sk);
404
405 sin->sin6_family = AF_INET6;
406 sin->sin6_flowinfo = 0;
407 sin->sin6_scope_id = 0;
408 if (peer) {
409 if (!inet->dport)
410 return -ENOTCONN;
411 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
412 peer == 1)
413 return -ENOTCONN;
414 sin->sin6_port = inet->dport;
415 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
416 if (np->sndflow)
417 sin->sin6_flowinfo = np->flow_label;
418 } else {
419 if (ipv6_addr_any(&np->rcv_saddr))
420 ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
421 else
422 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
423
424 sin->sin6_port = inet->sport;
425 }
426 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
427 sin->sin6_scope_id = sk->sk_bound_dev_if;
428 *uaddr_len = sizeof(*sin);
429 return(0);
430}
431
432int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
433{
434 struct sock *sk = sock->sk;
1da177e4
LT		 435
436 switch(cmd)
437 {
438 case SIOCGSTAMP:
439 return sock_get_timestamp(sk, (struct timeval __user *)arg);
440
441 case SIOCADDRT:
442 case SIOCDELRT:
443
444 return(ipv6_route_ioctl(cmd,(void __user *)arg));
445
446 case SIOCSIFADDR:
447 return addrconf_add_ifaddr((void __user *) arg);
448 case SIOCDIFADDR:
449 return addrconf_del_ifaddr((void __user *) arg);
450 case SIOCSIFDSTADDR:
451 return addrconf_set_dstaddr((void __user *) arg);
452 default:
b5e5fa5e
CH		 453 if (!sk->sk_prot->ioctl)
454 return -ENOIOCTLCMD;
455 return sk->sk_prot->ioctl(sk, cmd, arg);
1da177e4
LT		 456 }
457 /*NOTREACHED*/
458 return(0);
459}
460
90ddc4f0 461const struct proto_ops inet6_stream_ops = {
543d9cfe
ACM		 462 .family = PF_INET6,
463 .owner = THIS_MODULE,
464 .release = inet6_release,
465 .bind = inet6_bind,
466 .connect = inet_stream_connect, /* ok */
467 .socketpair = sock_no_socketpair, /* a do nothing */
468 .accept = inet_accept, /* ok */
469 .getname = inet6_getname,
470 .poll = tcp_poll, /* ok */
471 .ioctl = inet6_ioctl, /* must change */
472 .listen = inet_listen, /* ok */
473 .shutdown = inet_shutdown, /* ok */
474 .setsockopt = sock_common_setsockopt, /* ok */
475 .getsockopt = sock_common_getsockopt, /* ok */
476 .sendmsg = inet_sendmsg, /* ok */
477 .recvmsg = sock_common_recvmsg, /* ok */
478 .mmap = sock_no_mmap,
479 .sendpage = tcp_sendpage,
3fdadf7d 480#ifdef CONFIG_COMPAT
543d9cfe
ACM		 481 .compat_setsockopt = compat_sock_common_setsockopt,
482 .compat_getsockopt = compat_sock_common_getsockopt,
3fdadf7d 483#endif
1da177e4
LT		 484};
485
90ddc4f0 486const struct proto_ops inet6_dgram_ops = {
543d9cfe
ACM		 487 .family = PF_INET6,
488 .owner = THIS_MODULE,
489 .release = inet6_release,
490 .bind = inet6_bind,
491 .connect = inet_dgram_connect, /* ok */
492 .socketpair = sock_no_socketpair, /* a do nothing */
493 .accept = sock_no_accept, /* a do nothing */
494 .getname = inet6_getname,
495 .poll = udp_poll, /* ok */
496 .ioctl = inet6_ioctl, /* must change */
497 .listen = sock_no_listen, /* ok */
498 .shutdown = inet_shutdown, /* ok */
499 .setsockopt = sock_common_setsockopt, /* ok */
500 .getsockopt = sock_common_getsockopt, /* ok */
501 .sendmsg = inet_sendmsg, /* ok */
502 .recvmsg = sock_common_recvmsg, /* ok */
503 .mmap = sock_no_mmap,
504 .sendpage = sock_no_sendpage,
3fdadf7d 505#ifdef CONFIG_COMPAT
543d9cfe
ACM		 506 .compat_setsockopt = compat_sock_common_setsockopt,
507 .compat_getsockopt = compat_sock_common_getsockopt,
3fdadf7d 508#endif
1da177e4
LT		 509};
510
511static struct net_proto_family inet6_family_ops = {
512 .family = PF_INET6,
513 .create = inet6_create,
514 .owner = THIS_MODULE,
515};
516
1da177e4 517/* Same as inet6_dgram_ops, sans udp_poll. */
90ddc4f0 518static const struct proto_ops inet6_sockraw_ops = {
543d9cfe
ACM		 519 .family = PF_INET6,
520 .owner = THIS_MODULE,
521 .release = inet6_release,
522 .bind = inet6_bind,
523 .connect = inet_dgram_connect, /* ok */
524 .socketpair = sock_no_socketpair, /* a do nothing */
525 .accept = sock_no_accept, /* a do nothing */
526 .getname = inet6_getname,
527 .poll = datagram_poll, /* ok */
528 .ioctl = inet6_ioctl, /* must change */
529 .listen = sock_no_listen, /* ok */
530 .shutdown = inet_shutdown, /* ok */
531 .setsockopt = sock_common_setsockopt, /* ok */
532 .getsockopt = sock_common_getsockopt, /* ok */
533 .sendmsg = inet_sendmsg, /* ok */
534 .recvmsg = sock_common_recvmsg, /* ok */
535 .mmap = sock_no_mmap,
536 .sendpage = sock_no_sendpage,
3fdadf7d 537#ifdef CONFIG_COMPAT
543d9cfe
ACM		 538 .compat_setsockopt = compat_sock_common_setsockopt,
539 .compat_getsockopt = compat_sock_common_getsockopt,
3fdadf7d 540#endif
1da177e4
LT		 541};
542
543static struct inet_protosw rawv6_protosw = {
544 .type = SOCK_RAW,
545 .protocol = IPPROTO_IP, /* wild card */
546 .prot = &rawv6_prot,
547 .ops = &inet6_sockraw_ops,
548 .capability = CAP_NET_RAW,
549 .no_check = UDP_CSUM_DEFAULT,
550 .flags = INET_PROTOSW_REUSE,
551};
552
553void
554inet6_register_protosw(struct inet_protosw *p)
555{
556 struct list_head *lh;
557 struct inet_protosw *answer;
558 int protocol = p->protocol;
559 struct list_head *last_perm;
560
561 spin_lock_bh(&inetsw6_lock);
562
563 if (p->type >= SOCK_MAX)
564 goto out_illegal;
565
566 /* If we are trying to override a permanent protocol, bail. */
567 answer = NULL;
568 last_perm = &inetsw6[p->type];
569 list_for_each(lh, &inetsw6[p->type]) {
570 answer = list_entry(lh, struct inet_protosw, list);
571
572 /* Check only the non-wild match. */
573 if (INET_PROTOSW_PERMANENT & answer->flags) {
574 if (protocol == answer->protocol)
575 break;
576 last_perm = lh;
577 }
578
579 answer = NULL;
580 }
581 if (answer)
582 goto out_permanent;
583
584 /* Add the new entry after the last permanent entry if any, so that
585 * the new entry does not override a permanent entry when matched with
586 * a wild-card protocol. But it is allowed to override any existing
587 * non-permanent entry. This means that when we remove this entry, the
588 * system automatically returns to the old behavior.
589 */
590 list_add_rcu(&p->list, last_perm);
591out:
592 spin_unlock_bh(&inetsw6_lock);
593 return;
594
595out_permanent:
596 printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
597 protocol);
598 goto out;
599
600out_illegal:
601 printk(KERN_ERR
602 "Ignoring attempt to register invalid socket type %d.\n",
603 p->type);
604 goto out;
605}
606
607void
608inet6_unregister_protosw(struct inet_protosw *p)
609{
610 if (INET_PROTOSW_PERMANENT & p->flags) {
611 printk(KERN_ERR
612 "Attempt to unregister permanent protocol %d.\n",
613 p->protocol);
614 } else {
615 spin_lock_bh(&inetsw6_lock);
616 list_del_rcu(&p->list);
617 spin_unlock_bh(&inetsw6_lock);
618
619 synchronize_net();
620 }
621}
622
b9750ce1
ACM		 623int inet6_sk_rebuild_header(struct sock *sk)
624{
625 int err;
626 struct dst_entry *dst;
627 struct ipv6_pinfo *np = inet6_sk(sk);
628
629 dst = __sk_dst_check(sk, np->dst_cookie);
630
631 if (dst == NULL) {
632 struct inet_sock *inet = inet_sk(sk);
633 struct in6_addr *final_p = NULL, final;
634 struct flowi fl;
635
636 memset(&fl, 0, sizeof(fl));
637 fl.proto = sk->sk_protocol;
638 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
639 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
640 fl.fl6_flowlabel = np->flow_label;
641 fl.oif = sk->sk_bound_dev_if;
642 fl.fl_ip_dport = inet->dport;
643 fl.fl_ip_sport = inet->sport;
beb8d13b 644 security_sk_classify_flow(sk, &fl);
b9750ce1
ACM		 645
646 if (np->opt && np->opt->srcrt) {
647 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
648 ipv6_addr_copy(&final, &fl.fl6_dst);
649 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
650 final_p = &final;
651 }
652
653 err = ip6_dst_lookup(sk, &dst, &fl);
654 if (err) {
655 sk->sk_route_caps = 0;
656 return err;
657 }
658 if (final_p)
659 ipv6_addr_copy(&fl.fl6_dst, final_p);
660
661 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
662 sk->sk_err_soft = -err;
663 return err;
664 }
665
8e1ef0a9 666 __ip6_dst_store(sk, dst, NULL, NULL);
b9750ce1
ACM		 667 }
668
669 return 0;
670}
671
672EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
673
399c07de
ACM		 674int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
675{
676 struct ipv6_pinfo *np = inet6_sk(sk);
677 struct inet6_skb_parm *opt = IP6CB(skb);
678
679 if (np->rxopt.all) {
680 if ((opt->hop && (np->rxopt.bits.hopopts ||
681 np->rxopt.bits.ohopopts)) ||
90bcaf7b 682 ((IPV6_FLOWINFO_MASK & *(__be32*)skb->nh.raw) &&
399c07de
ACM		 683 np->rxopt.bits.rxflow) ||
684 (opt->srcrt && (np->rxopt.bits.srcrt ||
685 np->rxopt.bits.osrcrt)) ||
686 ((opt->dst1 || opt->dst0) &&
687 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
688 return 1;
689 }
690 return 0;
691}
692
693EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
694
1da177e4
LT		 695int
696snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
697{
698 if (ptr == NULL)
699 return -EINVAL;
700
f9f75005 701 ptr[0] = __alloc_percpu(mibsize);
1da177e4
LT		 702 if (!ptr[0])
703 goto err0;
704
f9f75005 705 ptr[1] = __alloc_percpu(mibsize);
1da177e4
LT		 706 if (!ptr[1])
707 goto err1;
708
709 return 0;
710
711err1:
712 free_percpu(ptr[0]);
713 ptr[0] = NULL;
714err0:
715 return -ENOMEM;
716}
717
718void
719snmp6_mib_free(void *ptr[2])
720{
721 if (ptr == NULL)
722 return;
723 if (ptr[0])
724 free_percpu(ptr[0]);
725 if (ptr[1])
726 free_percpu(ptr[1]);
727 ptr[0] = ptr[1] = NULL;
728}
729
730static int __init init_ipv6_mibs(void)
731{
732 if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
733 __alignof__(struct ipstats_mib)) < 0)
734 goto err_ip_mib;
735 if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
736 __alignof__(struct icmpv6_mib)) < 0)
737 goto err_icmp_mib;
738 if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
739 __alignof__(struct udp_mib)) < 0)
740 goto err_udp_mib;
ba4e58ec
GR		 741 if (snmp6_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib),
742 __alignof__(struct udp_mib)) < 0)
743 goto err_udplite_mib;
1da177e4
LT		 744 return 0;
745
ba4e58ec
GR		 746err_udplite_mib:
747 snmp6_mib_free((void **)udp_stats_in6);
1da177e4
LT		 748err_udp_mib:
749 snmp6_mib_free((void **)icmpv6_statistics);
750err_icmp_mib:
751 snmp6_mib_free((void **)ipv6_statistics);
752err_ip_mib:
753 return -ENOMEM;
754
755}
756
757static void cleanup_ipv6_mibs(void)
758{
759 snmp6_mib_free((void **)ipv6_statistics);
760 snmp6_mib_free((void **)icmpv6_statistics);
761 snmp6_mib_free((void **)udp_stats_in6);
ba4e58ec 762 snmp6_mib_free((void **)udplite_stats_in6);
1da177e4
LT		 763}
764
1da177e4
LT		 765static int __init inet6_init(void)
766{
767 struct sk_buff *dummy_skb;
768 struct list_head *r;
769 int err;
770
ef047f5e
YH		 771 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
772
1da177e4
LT		 773#ifdef MODULE
774#if 0 /* FIXME --RR */
775 if (!mod_member_present(&__this_module, can_unload))
776 return -EINVAL;
777
778 __this_module.can_unload = &ipv6_unload;
779#endif
780#endif
781
1da177e4
LT		 782 err = proto_register(&tcpv6_prot, 1);
783 if (err)
784 goto out;
785
786 err = proto_register(&udpv6_prot, 1);
787 if (err)
788 goto out_unregister_tcp_proto;
789
ba4e58ec 790 err = proto_register(&udplitev6_prot, 1);
1da177e4
LT		 791 if (err)
792 goto out_unregister_udp_proto;
793
ba4e58ec
GR		 794 err = proto_register(&rawv6_prot, 1);
795 if (err)
796 goto out_unregister_udplite_proto;
797
1da177e4
LT		 798
799 /* Register the socket-side information for inet6_create. */
800 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
801 INIT_LIST_HEAD(r);
802
803 /* We MUST register RAW sockets before we create the ICMP6,
804 * IGMP6, or NDISC control sockets.
805 */
806 inet6_register_protosw(&rawv6_protosw);
807
808 /* Register the family here so that the init calls below will
809 * be able to create sockets. (?? is this dangerous ??)
810 */
8eb55910
DM		 811 err = sock_register(&inet6_family_ops);
812 if (err)
813 goto out_unregister_raw_proto;
1da177e4
LT		 814
815 /* Initialise ipv6 mibs */
816 err = init_ipv6_mibs();
817 if (err)
8eb55910 818 goto out_unregister_sock;
1da177e4
LT		 819
820 /*
821 * ipngwg API draft makes clear that the correct semantics
822 * for TCP and UDP is to consider one TCP and UDP instance
823 * in a host availiable by both INET and INET6 APIs and
824 * able to communicate via both network protocols.
825 */
826
827#ifdef CONFIG_SYSCTL
828 ipv6_sysctl_register();
829#endif
830 err = icmpv6_init(&inet6_family_ops);
831 if (err)
832 goto icmp_fail;
833 err = ndisc_init(&inet6_family_ops);
834 if (err)
835 goto ndisc_fail;
836 err = igmp6_init(&inet6_family_ops);
837 if (err)
838 goto igmp_fail;
2cc7d573
HW		 839 err = ipv6_netfilter_init();
840 if (err)
841 goto netfilter_fail;
1da177e4
LT		 842 /* Create /proc/foo6 entries. */
843#ifdef CONFIG_PROC_FS
844 err = -ENOMEM;
845 if (raw6_proc_init())
846 goto proc_raw6_fail;
847 if (tcp6_proc_init())
848 goto proc_tcp6_fail;
849 if (udp6_proc_init())
850 goto proc_udp6_fail;
ba4e58ec
GR		 851 if (udplite6_proc_init())
852 goto proc_udplite6_fail;
1da177e4
LT		 853 if (ipv6_misc_proc_init())
854 goto proc_misc6_fail;
855
856 if (ac6_proc_init())
857 goto proc_anycast6_fail;
858 if (if6_proc_init())
859 goto proc_if6_fail;
860#endif
1da177e4
LT		 861 ip6_route_init();
862 ip6_flowlabel_init();
863 err = addrconf_init();
864 if (err)
865 goto addrconf_fail;
1da177e4
LT		 866
867 /* Init v6 extension headers. */
868 ipv6_rthdr_init();
869 ipv6_frag_init();
870 ipv6_nodata_init();
871 ipv6_destopt_init();
2c8d7ca0
NT		 872#ifdef CONFIG_IPV6_MIP6
873 mip6_init();
874#endif
1da177e4
LT		 875
876 /* Init v6 transport protocols. */
877 udpv6_init();
ba4e58ec 878 udplitev6_init();
1da177e4 879 tcpv6_init();
e2ed4052
HX		 880
881 ipv6_packet_init();
1da177e4
LT		 882 err = 0;
883out:
884 return err;
885
886addrconf_fail:
887 ip6_flowlabel_cleanup();
888 ip6_route_cleanup();
1da177e4
LT		 889#ifdef CONFIG_PROC_FS
890 if6_proc_exit();
891proc_if6_fail:
892 ac6_proc_exit();
893proc_anycast6_fail:
894 ipv6_misc_proc_exit();
895proc_misc6_fail:
ba4e58ec
GR		 896 udplite6_proc_exit();
897proc_udplite6_fail:
1da177e4
LT		 898 udp6_proc_exit();
899proc_udp6_fail:
900 tcp6_proc_exit();
901proc_tcp6_fail:
902 raw6_proc_exit();
903proc_raw6_fail:
904#endif
2cc7d573
HW		 905 ipv6_netfilter_fini();
906netfilter_fail:
1da177e4
LT		 907 igmp6_cleanup();
908igmp_fail:
909 ndisc_cleanup();
910ndisc_fail:
911 icmpv6_cleanup();
912icmp_fail:
913#ifdef CONFIG_SYSCTL
914 ipv6_sysctl_unregister();
915#endif
916 cleanup_ipv6_mibs();
8eb55910
DM		 917out_unregister_sock:
918 sock_unregister(PF_INET6);
1da177e4
LT		 919out_unregister_raw_proto:
920 proto_unregister(&rawv6_prot);
ba4e58ec
GR		 921out_unregister_udplite_proto:
922 proto_unregister(&udplitev6_prot);
1da177e4
LT		 923out_unregister_udp_proto:
924 proto_unregister(&udpv6_prot);
925out_unregister_tcp_proto:
926 proto_unregister(&tcpv6_prot);
927 goto out;
928}
929module_init(inet6_init);
930
931static void __exit inet6_exit(void)
932{
933 /* First of all disallow new sockets creation. */
934 sock_unregister(PF_INET6);
935#ifdef CONFIG_PROC_FS
936 if6_proc_exit();
937 ac6_proc_exit();
938 ipv6_misc_proc_exit();
939 udp6_proc_exit();
ba4e58ec 940 udplite6_proc_exit();
1da177e4
LT		 941 tcp6_proc_exit();
942 raw6_proc_exit();
2c8d7ca0
NT		 943#endif
944#ifdef CONFIG_IPV6_MIP6
945 mip6_fini();
1da177e4
LT		 946#endif
947 /* Cleanup code parts. */
1da177e4
LT		 948 ip6_flowlabel_cleanup();
949 addrconf_cleanup();
950 ip6_route_cleanup();
951 ipv6_packet_cleanup();
952 igmp6_cleanup();
2cc7d573 953 ipv6_netfilter_fini();
1da177e4
LT		 954 ndisc_cleanup();
955 icmpv6_cleanup();
956#ifdef CONFIG_SYSCTL
957 ipv6_sysctl_unregister();
958#endif
959 cleanup_ipv6_mibs();
960 proto_unregister(&rawv6_prot);
961 proto_unregister(&udpv6_prot);
962 proto_unregister(&tcpv6_prot);
963}
964module_exit(inet6_exit);
965
966MODULE_ALIAS_NETPROTO(PF_INET6);
Linux 6.x block layer and io_uring tree(s)