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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 | * $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> | |
25 | #include <linux/config.h> | |
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> | |
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> | |
47 | #include <linux/netfilter_ipv6.h> | |
48 | ||
49 | #include <net/ip.h> | |
50 | #include <net/ipv6.h> | |
51 | #include <net/udp.h> | |
52 | #include <net/tcp.h> | |
53 | #include <net/ipip.h> | |
54 | #include <net/protocol.h> | |
55 | #include <net/inet_common.h> | |
56 | #include <net/transp_v6.h> | |
57 | #include <net/ip6_route.h> | |
58 | #include <net/addrconf.h> | |
59 | #ifdef CONFIG_IPV6_TUNNEL | |
60 | #include <net/ip6_tunnel.h> | |
61 | #endif | |
62 | ||
63 | #include <asm/uaccess.h> | |
64 | #include <asm/system.h> | |
65 | ||
66 | MODULE_AUTHOR("Cast of dozens"); | |
67 | MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); | |
68 | MODULE_LICENSE("GPL"); | |
69 | ||
70 | int sysctl_ipv6_bindv6only; | |
71 | ||
72 | /* The inetsw table contains everything that inet_create needs to | |
73 | * build a new socket. | |
74 | */ | |
75 | static struct list_head inetsw6[SOCK_MAX]; | |
76 | static DEFINE_SPINLOCK(inetsw6_lock); | |
77 | ||
78 | static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) | |
79 | { | |
80 | const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); | |
81 | ||
82 | return (struct ipv6_pinfo *)(((u8 *)sk) + offset); | |
83 | } | |
84 | ||
85 | static int inet6_create(struct socket *sock, int protocol) | |
86 | { | |
87 | struct inet_sock *inet; | |
88 | struct ipv6_pinfo *np; | |
89 | struct sock *sk; | |
90 | struct list_head *p; | |
91 | struct inet_protosw *answer; | |
92 | struct proto *answer_prot; | |
93 | unsigned char answer_flags; | |
94 | char answer_no_check; | |
95 | int rc; | |
96 | ||
97 | /* Look for the requested type/protocol pair. */ | |
98 | answer = NULL; | |
99 | rcu_read_lock(); | |
100 | list_for_each_rcu(p, &inetsw6[sock->type]) { | |
101 | answer = list_entry(p, struct inet_protosw, list); | |
102 | ||
103 | /* Check the non-wild match. */ | |
104 | if (protocol == answer->protocol) { | |
105 | if (protocol != IPPROTO_IP) | |
106 | break; | |
107 | } else { | |
108 | /* Check for the two wild cases. */ | |
109 | if (IPPROTO_IP == protocol) { | |
110 | protocol = answer->protocol; | |
111 | break; | |
112 | } | |
113 | if (IPPROTO_IP == answer->protocol) | |
114 | break; | |
115 | } | |
116 | answer = NULL; | |
117 | } | |
118 | ||
119 | rc = -ESOCKTNOSUPPORT; | |
120 | if (!answer) | |
121 | goto out_rcu_unlock; | |
122 | rc = -EPERM; | |
123 | if (answer->capability > 0 && !capable(answer->capability)) | |
124 | goto out_rcu_unlock; | |
125 | rc = -EPROTONOSUPPORT; | |
126 | if (!protocol) | |
127 | goto out_rcu_unlock; | |
128 | ||
129 | sock->ops = answer->ops; | |
130 | ||
131 | answer_prot = answer->prot; | |
132 | answer_no_check = answer->no_check; | |
133 | answer_flags = answer->flags; | |
134 | rcu_read_unlock(); | |
135 | ||
136 | BUG_TRAP(answer_prot->slab != NULL); | |
137 | ||
138 | rc = -ENOBUFS; | |
139 | sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1); | |
140 | if (sk == NULL) | |
141 | goto out; | |
142 | ||
143 | sock_init_data(sock, sk); | |
144 | ||
145 | rc = 0; | |
146 | sk->sk_no_check = answer_no_check; | |
147 | if (INET_PROTOSW_REUSE & answer_flags) | |
148 | sk->sk_reuse = 1; | |
149 | ||
150 | inet = inet_sk(sk); | |
151 | ||
152 | if (SOCK_RAW == sock->type) { | |
153 | inet->num = protocol; | |
154 | if (IPPROTO_RAW == protocol) | |
155 | inet->hdrincl = 1; | |
156 | } | |
157 | ||
158 | sk->sk_destruct = inet_sock_destruct; | |
159 | sk->sk_family = PF_INET6; | |
160 | sk->sk_protocol = protocol; | |
161 | ||
162 | sk->sk_backlog_rcv = answer->prot->backlog_rcv; | |
163 | ||
164 | inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); | |
165 | np->hop_limit = -1; | |
166 | np->mcast_hops = -1; | |
167 | np->mc_loop = 1; | |
168 | np->pmtudisc = IPV6_PMTUDISC_WANT; | |
169 | np->ipv6only = sysctl_ipv6_bindv6only; | |
170 | ||
171 | /* Init the ipv4 part of the socket since we can have sockets | |
172 | * using v6 API for ipv4. | |
173 | */ | |
174 | inet->uc_ttl = -1; | |
175 | ||
176 | inet->mc_loop = 1; | |
177 | inet->mc_ttl = 1; | |
178 | inet->mc_index = 0; | |
179 | inet->mc_list = NULL; | |
180 | ||
181 | if (ipv4_config.no_pmtu_disc) | |
182 | inet->pmtudisc = IP_PMTUDISC_DONT; | |
183 | else | |
184 | inet->pmtudisc = IP_PMTUDISC_WANT; | |
185 | /* | |
186 | * Increment only the relevant sk_prot->socks debug field, this changes | |
187 | * the previous behaviour of incrementing both the equivalent to | |
188 | * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. | |
189 | * | |
190 | * This allows better debug granularity as we'll know exactly how many | |
191 | * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 | |
192 | * transport protocol socks. -acme | |
193 | */ | |
194 | sk_refcnt_debug_inc(sk); | |
195 | ||
196 | if (inet->num) { | |
197 | /* It assumes that any protocol which allows | |
198 | * the user to assign a number at socket | |
199 | * creation time automatically shares. | |
200 | */ | |
201 | inet->sport = ntohs(inet->num); | |
202 | sk->sk_prot->hash(sk); | |
203 | } | |
204 | if (sk->sk_prot->init) { | |
205 | rc = sk->sk_prot->init(sk); | |
206 | if (rc) { | |
207 | sk_common_release(sk); | |
208 | goto out; | |
209 | } | |
210 | } | |
211 | out: | |
212 | return rc; | |
213 | out_rcu_unlock: | |
214 | rcu_read_unlock(); | |
215 | goto out; | |
216 | } | |
217 | ||
218 | ||
219 | /* bind for INET6 API */ | |
220 | int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
221 | { | |
222 | struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr; | |
223 | struct sock *sk = sock->sk; | |
224 | struct inet_sock *inet = inet_sk(sk); | |
225 | struct ipv6_pinfo *np = inet6_sk(sk); | |
226 | __u32 v4addr = 0; | |
227 | unsigned short snum; | |
228 | int addr_type = 0; | |
229 | int err = 0; | |
230 | ||
231 | /* If the socket has its own bind function then use it. */ | |
232 | if (sk->sk_prot->bind) | |
233 | return sk->sk_prot->bind(sk, uaddr, addr_len); | |
234 | ||
235 | if (addr_len < SIN6_LEN_RFC2133) | |
236 | return -EINVAL; | |
237 | addr_type = ipv6_addr_type(&addr->sin6_addr); | |
238 | if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) | |
239 | return -EINVAL; | |
240 | ||
241 | snum = ntohs(addr->sin6_port); | |
242 | if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) | |
243 | return -EACCES; | |
244 | ||
245 | lock_sock(sk); | |
246 | ||
247 | /* Check these errors (active socket, double bind). */ | |
248 | if (sk->sk_state != TCP_CLOSE || inet->num) { | |
249 | err = -EINVAL; | |
250 | goto out; | |
251 | } | |
252 | ||
253 | /* Check if the address belongs to the host. */ | |
254 | if (addr_type == IPV6_ADDR_MAPPED) { | |
255 | v4addr = addr->sin6_addr.s6_addr32[3]; | |
256 | if (inet_addr_type(v4addr) != RTN_LOCAL) { | |
257 | err = -EADDRNOTAVAIL; | |
258 | goto out; | |
259 | } | |
260 | } else { | |
261 | if (addr_type != IPV6_ADDR_ANY) { | |
262 | struct net_device *dev = NULL; | |
263 | ||
264 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
265 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
266 | addr->sin6_scope_id) { | |
267 | /* Override any existing binding, if another one | |
268 | * is supplied by user. | |
269 | */ | |
270 | sk->sk_bound_dev_if = addr->sin6_scope_id; | |
271 | } | |
272 | ||
273 | /* Binding to link-local address requires an interface */ | |
274 | if (!sk->sk_bound_dev_if) { | |
275 | err = -EINVAL; | |
276 | goto out; | |
277 | } | |
278 | dev = dev_get_by_index(sk->sk_bound_dev_if); | |
279 | if (!dev) { | |
280 | err = -ENODEV; | |
281 | goto out; | |
282 | } | |
283 | } | |
284 | ||
285 | /* ipv4 addr of the socket is invalid. Only the | |
286 | * unspecified and mapped address have a v4 equivalent. | |
287 | */ | |
288 | v4addr = LOOPBACK4_IPV6; | |
289 | if (!(addr_type & IPV6_ADDR_MULTICAST)) { | |
290 | if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) { | |
291 | if (dev) | |
292 | dev_put(dev); | |
293 | err = -EADDRNOTAVAIL; | |
294 | goto out; | |
295 | } | |
296 | } | |
297 | if (dev) | |
298 | dev_put(dev); | |
299 | } | |
300 | } | |
301 | ||
302 | inet->rcv_saddr = v4addr; | |
303 | inet->saddr = v4addr; | |
304 | ||
305 | ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); | |
306 | ||
307 | if (!(addr_type & IPV6_ADDR_MULTICAST)) | |
308 | ipv6_addr_copy(&np->saddr, &addr->sin6_addr); | |
309 | ||
310 | /* Make sure we are allowed to bind here. */ | |
311 | if (sk->sk_prot->get_port(sk, snum)) { | |
312 | inet_reset_saddr(sk); | |
313 | err = -EADDRINUSE; | |
314 | goto out; | |
315 | } | |
316 | ||
317 | if (addr_type != IPV6_ADDR_ANY) | |
318 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; | |
319 | if (snum) | |
320 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
321 | inet->sport = ntohs(inet->num); | |
322 | inet->dport = 0; | |
323 | inet->daddr = 0; | |
324 | out: | |
325 | release_sock(sk); | |
326 | return err; | |
327 | } | |
328 | ||
329 | int inet6_release(struct socket *sock) | |
330 | { | |
331 | struct sock *sk = sock->sk; | |
332 | ||
333 | if (sk == NULL) | |
334 | return -EINVAL; | |
335 | ||
336 | /* Free mc lists */ | |
337 | ipv6_sock_mc_close(sk); | |
338 | ||
339 | /* Free ac lists */ | |
340 | ipv6_sock_ac_close(sk); | |
341 | ||
342 | return inet_release(sock); | |
343 | } | |
344 | ||
345 | int inet6_destroy_sock(struct sock *sk) | |
346 | { | |
347 | struct ipv6_pinfo *np = inet6_sk(sk); | |
348 | struct sk_buff *skb; | |
349 | struct ipv6_txoptions *opt; | |
350 | ||
351 | /* | |
352 | * Release destination entry | |
353 | */ | |
354 | ||
355 | sk_dst_reset(sk); | |
356 | ||
357 | /* Release rx options */ | |
358 | ||
359 | if ((skb = xchg(&np->pktoptions, NULL)) != NULL) | |
360 | kfree_skb(skb); | |
361 | ||
362 | /* Free flowlabels */ | |
363 | fl6_free_socklist(sk); | |
364 | ||
365 | /* Free tx options */ | |
366 | ||
367 | if ((opt = xchg(&np->opt, NULL)) != NULL) | |
368 | sock_kfree_s(sk, opt, opt->tot_len); | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
373 | /* | |
374 | * This does both peername and sockname. | |
375 | */ | |
376 | ||
377 | int inet6_getname(struct socket *sock, struct sockaddr *uaddr, | |
378 | int *uaddr_len, int peer) | |
379 | { | |
380 | struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; | |
381 | struct sock *sk = sock->sk; | |
382 | struct inet_sock *inet = inet_sk(sk); | |
383 | struct ipv6_pinfo *np = inet6_sk(sk); | |
384 | ||
385 | sin->sin6_family = AF_INET6; | |
386 | sin->sin6_flowinfo = 0; | |
387 | sin->sin6_scope_id = 0; | |
388 | if (peer) { | |
389 | if (!inet->dport) | |
390 | return -ENOTCONN; | |
391 | if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && | |
392 | peer == 1) | |
393 | return -ENOTCONN; | |
394 | sin->sin6_port = inet->dport; | |
395 | ipv6_addr_copy(&sin->sin6_addr, &np->daddr); | |
396 | if (np->sndflow) | |
397 | sin->sin6_flowinfo = np->flow_label; | |
398 | } else { | |
399 | if (ipv6_addr_any(&np->rcv_saddr)) | |
400 | ipv6_addr_copy(&sin->sin6_addr, &np->saddr); | |
401 | else | |
402 | ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); | |
403 | ||
404 | sin->sin6_port = inet->sport; | |
405 | } | |
406 | if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
407 | sin->sin6_scope_id = sk->sk_bound_dev_if; | |
408 | *uaddr_len = sizeof(*sin); | |
409 | return(0); | |
410 | } | |
411 | ||
412 | int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
413 | { | |
414 | struct sock *sk = sock->sk; | |
415 | int err = -EINVAL; | |
416 | ||
417 | switch(cmd) | |
418 | { | |
419 | case SIOCGSTAMP: | |
420 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
421 | ||
422 | case SIOCADDRT: | |
423 | case SIOCDELRT: | |
424 | ||
425 | return(ipv6_route_ioctl(cmd,(void __user *)arg)); | |
426 | ||
427 | case SIOCSIFADDR: | |
428 | return addrconf_add_ifaddr((void __user *) arg); | |
429 | case SIOCDIFADDR: | |
430 | return addrconf_del_ifaddr((void __user *) arg); | |
431 | case SIOCSIFDSTADDR: | |
432 | return addrconf_set_dstaddr((void __user *) arg); | |
433 | default: | |
434 | if (!sk->sk_prot->ioctl || | |
435 | (err = sk->sk_prot->ioctl(sk, cmd, arg)) == -ENOIOCTLCMD) | |
436 | return(dev_ioctl(cmd,(void __user *) arg)); | |
437 | return err; | |
438 | } | |
439 | /*NOTREACHED*/ | |
440 | return(0); | |
441 | } | |
442 | ||
443 | struct proto_ops inet6_stream_ops = { | |
444 | .family = PF_INET6, | |
445 | .owner = THIS_MODULE, | |
446 | .release = inet6_release, | |
447 | .bind = inet6_bind, | |
448 | .connect = inet_stream_connect, /* ok */ | |
449 | .socketpair = sock_no_socketpair, /* a do nothing */ | |
450 | .accept = inet_accept, /* ok */ | |
451 | .getname = inet6_getname, | |
452 | .poll = tcp_poll, /* ok */ | |
453 | .ioctl = inet6_ioctl, /* must change */ | |
454 | .listen = inet_listen, /* ok */ | |
455 | .shutdown = inet_shutdown, /* ok */ | |
456 | .setsockopt = sock_common_setsockopt, /* ok */ | |
457 | .getsockopt = sock_common_getsockopt, /* ok */ | |
458 | .sendmsg = inet_sendmsg, /* ok */ | |
459 | .recvmsg = sock_common_recvmsg, /* ok */ | |
460 | .mmap = sock_no_mmap, | |
461 | .sendpage = tcp_sendpage | |
462 | }; | |
463 | ||
464 | struct proto_ops inet6_dgram_ops = { | |
465 | .family = PF_INET6, | |
466 | .owner = THIS_MODULE, | |
467 | .release = inet6_release, | |
468 | .bind = inet6_bind, | |
469 | .connect = inet_dgram_connect, /* ok */ | |
470 | .socketpair = sock_no_socketpair, /* a do nothing */ | |
471 | .accept = sock_no_accept, /* a do nothing */ | |
472 | .getname = inet6_getname, | |
473 | .poll = udp_poll, /* ok */ | |
474 | .ioctl = inet6_ioctl, /* must change */ | |
475 | .listen = sock_no_listen, /* ok */ | |
476 | .shutdown = inet_shutdown, /* ok */ | |
477 | .setsockopt = sock_common_setsockopt, /* ok */ | |
478 | .getsockopt = sock_common_getsockopt, /* ok */ | |
479 | .sendmsg = inet_sendmsg, /* ok */ | |
480 | .recvmsg = sock_common_recvmsg, /* ok */ | |
481 | .mmap = sock_no_mmap, | |
482 | .sendpage = sock_no_sendpage, | |
483 | }; | |
484 | ||
485 | static struct net_proto_family inet6_family_ops = { | |
486 | .family = PF_INET6, | |
487 | .create = inet6_create, | |
488 | .owner = THIS_MODULE, | |
489 | }; | |
490 | ||
491 | /* Same as inet6_dgram_ops, sans udp_poll. */ | |
492 | static struct proto_ops inet6_sockraw_ops = { | |
493 | .family = PF_INET6, | |
494 | .owner = THIS_MODULE, | |
495 | .release = inet6_release, | |
496 | .bind = inet6_bind, | |
497 | .connect = inet_dgram_connect, /* ok */ | |
498 | .socketpair = sock_no_socketpair, /* a do nothing */ | |
499 | .accept = sock_no_accept, /* a do nothing */ | |
500 | .getname = inet6_getname, | |
501 | .poll = datagram_poll, /* ok */ | |
502 | .ioctl = inet6_ioctl, /* must change */ | |
503 | .listen = sock_no_listen, /* ok */ | |
504 | .shutdown = inet_shutdown, /* ok */ | |
505 | .setsockopt = sock_common_setsockopt, /* ok */ | |
506 | .getsockopt = sock_common_getsockopt, /* ok */ | |
507 | .sendmsg = inet_sendmsg, /* ok */ | |
508 | .recvmsg = sock_common_recvmsg, /* ok */ | |
509 | .mmap = sock_no_mmap, | |
510 | .sendpage = sock_no_sendpage, | |
511 | }; | |
512 | ||
513 | static struct inet_protosw rawv6_protosw = { | |
514 | .type = SOCK_RAW, | |
515 | .protocol = IPPROTO_IP, /* wild card */ | |
516 | .prot = &rawv6_prot, | |
517 | .ops = &inet6_sockraw_ops, | |
518 | .capability = CAP_NET_RAW, | |
519 | .no_check = UDP_CSUM_DEFAULT, | |
520 | .flags = INET_PROTOSW_REUSE, | |
521 | }; | |
522 | ||
523 | void | |
524 | inet6_register_protosw(struct inet_protosw *p) | |
525 | { | |
526 | struct list_head *lh; | |
527 | struct inet_protosw *answer; | |
528 | int protocol = p->protocol; | |
529 | struct list_head *last_perm; | |
530 | ||
531 | spin_lock_bh(&inetsw6_lock); | |
532 | ||
533 | if (p->type >= SOCK_MAX) | |
534 | goto out_illegal; | |
535 | ||
536 | /* If we are trying to override a permanent protocol, bail. */ | |
537 | answer = NULL; | |
538 | last_perm = &inetsw6[p->type]; | |
539 | list_for_each(lh, &inetsw6[p->type]) { | |
540 | answer = list_entry(lh, struct inet_protosw, list); | |
541 | ||
542 | /* Check only the non-wild match. */ | |
543 | if (INET_PROTOSW_PERMANENT & answer->flags) { | |
544 | if (protocol == answer->protocol) | |
545 | break; | |
546 | last_perm = lh; | |
547 | } | |
548 | ||
549 | answer = NULL; | |
550 | } | |
551 | if (answer) | |
552 | goto out_permanent; | |
553 | ||
554 | /* Add the new entry after the last permanent entry if any, so that | |
555 | * the new entry does not override a permanent entry when matched with | |
556 | * a wild-card protocol. But it is allowed to override any existing | |
557 | * non-permanent entry. This means that when we remove this entry, the | |
558 | * system automatically returns to the old behavior. | |
559 | */ | |
560 | list_add_rcu(&p->list, last_perm); | |
561 | out: | |
562 | spin_unlock_bh(&inetsw6_lock); | |
563 | return; | |
564 | ||
565 | out_permanent: | |
566 | printk(KERN_ERR "Attempt to override permanent protocol %d.\n", | |
567 | protocol); | |
568 | goto out; | |
569 | ||
570 | out_illegal: | |
571 | printk(KERN_ERR | |
572 | "Ignoring attempt to register invalid socket type %d.\n", | |
573 | p->type); | |
574 | goto out; | |
575 | } | |
576 | ||
577 | void | |
578 | inet6_unregister_protosw(struct inet_protosw *p) | |
579 | { | |
580 | if (INET_PROTOSW_PERMANENT & p->flags) { | |
581 | printk(KERN_ERR | |
582 | "Attempt to unregister permanent protocol %d.\n", | |
583 | p->protocol); | |
584 | } else { | |
585 | spin_lock_bh(&inetsw6_lock); | |
586 | list_del_rcu(&p->list); | |
587 | spin_unlock_bh(&inetsw6_lock); | |
588 | ||
589 | synchronize_net(); | |
590 | } | |
591 | } | |
592 | ||
593 | int | |
594 | snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign) | |
595 | { | |
596 | if (ptr == NULL) | |
597 | return -EINVAL; | |
598 | ||
599 | ptr[0] = __alloc_percpu(mibsize, mibalign); | |
600 | if (!ptr[0]) | |
601 | goto err0; | |
602 | ||
603 | ptr[1] = __alloc_percpu(mibsize, mibalign); | |
604 | if (!ptr[1]) | |
605 | goto err1; | |
606 | ||
607 | return 0; | |
608 | ||
609 | err1: | |
610 | free_percpu(ptr[0]); | |
611 | ptr[0] = NULL; | |
612 | err0: | |
613 | return -ENOMEM; | |
614 | } | |
615 | ||
616 | void | |
617 | snmp6_mib_free(void *ptr[2]) | |
618 | { | |
619 | if (ptr == NULL) | |
620 | return; | |
621 | if (ptr[0]) | |
622 | free_percpu(ptr[0]); | |
623 | if (ptr[1]) | |
624 | free_percpu(ptr[1]); | |
625 | ptr[0] = ptr[1] = NULL; | |
626 | } | |
627 | ||
628 | static int __init init_ipv6_mibs(void) | |
629 | { | |
630 | if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib), | |
631 | __alignof__(struct ipstats_mib)) < 0) | |
632 | goto err_ip_mib; | |
633 | if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib), | |
634 | __alignof__(struct icmpv6_mib)) < 0) | |
635 | goto err_icmp_mib; | |
636 | if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib), | |
637 | __alignof__(struct udp_mib)) < 0) | |
638 | goto err_udp_mib; | |
639 | return 0; | |
640 | ||
641 | err_udp_mib: | |
642 | snmp6_mib_free((void **)icmpv6_statistics); | |
643 | err_icmp_mib: | |
644 | snmp6_mib_free((void **)ipv6_statistics); | |
645 | err_ip_mib: | |
646 | return -ENOMEM; | |
647 | ||
648 | } | |
649 | ||
650 | static void cleanup_ipv6_mibs(void) | |
651 | { | |
652 | snmp6_mib_free((void **)ipv6_statistics); | |
653 | snmp6_mib_free((void **)icmpv6_statistics); | |
654 | snmp6_mib_free((void **)udp_stats_in6); | |
655 | } | |
656 | ||
657 | static int __init inet6_init(void) | |
658 | { | |
659 | struct sk_buff *dummy_skb; | |
660 | struct list_head *r; | |
661 | int err; | |
662 | ||
663 | #ifdef MODULE | |
664 | #if 0 /* FIXME --RR */ | |
665 | if (!mod_member_present(&__this_module, can_unload)) | |
666 | return -EINVAL; | |
667 | ||
668 | __this_module.can_unload = &ipv6_unload; | |
669 | #endif | |
670 | #endif | |
671 | ||
672 | if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) { | |
673 | printk(KERN_CRIT "inet6_proto_init: size fault\n"); | |
674 | return -EINVAL; | |
675 | } | |
676 | ||
677 | err = proto_register(&tcpv6_prot, 1); | |
678 | if (err) | |
679 | goto out; | |
680 | ||
681 | err = proto_register(&udpv6_prot, 1); | |
682 | if (err) | |
683 | goto out_unregister_tcp_proto; | |
684 | ||
685 | err = proto_register(&rawv6_prot, 1); | |
686 | if (err) | |
687 | goto out_unregister_udp_proto; | |
688 | ||
689 | ||
690 | /* Register the socket-side information for inet6_create. */ | |
691 | for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) | |
692 | INIT_LIST_HEAD(r); | |
693 | ||
694 | /* We MUST register RAW sockets before we create the ICMP6, | |
695 | * IGMP6, or NDISC control sockets. | |
696 | */ | |
697 | inet6_register_protosw(&rawv6_protosw); | |
698 | ||
699 | /* Register the family here so that the init calls below will | |
700 | * be able to create sockets. (?? is this dangerous ??) | |
701 | */ | |
702 | (void) sock_register(&inet6_family_ops); | |
703 | ||
704 | /* Initialise ipv6 mibs */ | |
705 | err = init_ipv6_mibs(); | |
706 | if (err) | |
707 | goto out_unregister_raw_proto; | |
708 | ||
709 | /* | |
710 | * ipngwg API draft makes clear that the correct semantics | |
711 | * for TCP and UDP is to consider one TCP and UDP instance | |
712 | * in a host availiable by both INET and INET6 APIs and | |
713 | * able to communicate via both network protocols. | |
714 | */ | |
715 | ||
716 | #ifdef CONFIG_SYSCTL | |
717 | ipv6_sysctl_register(); | |
718 | #endif | |
719 | err = icmpv6_init(&inet6_family_ops); | |
720 | if (err) | |
721 | goto icmp_fail; | |
722 | err = ndisc_init(&inet6_family_ops); | |
723 | if (err) | |
724 | goto ndisc_fail; | |
725 | err = igmp6_init(&inet6_family_ops); | |
726 | if (err) | |
727 | goto igmp_fail; | |
728 | err = ipv6_netfilter_init(); | |
729 | if (err) | |
730 | goto netfilter_fail; | |
731 | /* Create /proc/foo6 entries. */ | |
732 | #ifdef CONFIG_PROC_FS | |
733 | err = -ENOMEM; | |
734 | if (raw6_proc_init()) | |
735 | goto proc_raw6_fail; | |
736 | if (tcp6_proc_init()) | |
737 | goto proc_tcp6_fail; | |
738 | if (udp6_proc_init()) | |
739 | goto proc_udp6_fail; | |
740 | if (ipv6_misc_proc_init()) | |
741 | goto proc_misc6_fail; | |
742 | ||
743 | if (ac6_proc_init()) | |
744 | goto proc_anycast6_fail; | |
745 | if (if6_proc_init()) | |
746 | goto proc_if6_fail; | |
747 | #endif | |
748 | ip6_route_init(); | |
749 | ip6_flowlabel_init(); | |
750 | err = addrconf_init(); | |
751 | if (err) | |
752 | goto addrconf_fail; | |
753 | sit_init(); | |
754 | ||
755 | /* Init v6 extension headers. */ | |
756 | ipv6_rthdr_init(); | |
757 | ipv6_frag_init(); | |
758 | ipv6_nodata_init(); | |
759 | ipv6_destopt_init(); | |
760 | ||
761 | /* Init v6 transport protocols. */ | |
762 | udpv6_init(); | |
763 | tcpv6_init(); | |
764 | ||
765 | ipv6_packet_init(); | |
766 | err = 0; | |
767 | out: | |
768 | return err; | |
769 | ||
770 | addrconf_fail: | |
771 | ip6_flowlabel_cleanup(); | |
772 | ip6_route_cleanup(); | |
773 | #ifdef CONFIG_PROC_FS | |
774 | if6_proc_exit(); | |
775 | proc_if6_fail: | |
776 | ac6_proc_exit(); | |
777 | proc_anycast6_fail: | |
778 | ipv6_misc_proc_exit(); | |
779 | proc_misc6_fail: | |
780 | udp6_proc_exit(); | |
781 | proc_udp6_fail: | |
782 | tcp6_proc_exit(); | |
783 | proc_tcp6_fail: | |
784 | raw6_proc_exit(); | |
785 | proc_raw6_fail: | |
786 | #endif | |
787 | ipv6_netfilter_fini(); | |
788 | netfilter_fail: | |
789 | igmp6_cleanup(); | |
790 | igmp_fail: | |
791 | ndisc_cleanup(); | |
792 | ndisc_fail: | |
793 | icmpv6_cleanup(); | |
794 | icmp_fail: | |
795 | #ifdef CONFIG_SYSCTL | |
796 | ipv6_sysctl_unregister(); | |
797 | #endif | |
798 | cleanup_ipv6_mibs(); | |
799 | out_unregister_raw_proto: | |
800 | proto_unregister(&rawv6_prot); | |
801 | out_unregister_udp_proto: | |
802 | proto_unregister(&udpv6_prot); | |
803 | out_unregister_tcp_proto: | |
804 | proto_unregister(&tcpv6_prot); | |
805 | goto out; | |
806 | } | |
807 | module_init(inet6_init); | |
808 | ||
809 | static void __exit inet6_exit(void) | |
810 | { | |
811 | /* First of all disallow new sockets creation. */ | |
812 | sock_unregister(PF_INET6); | |
813 | #ifdef CONFIG_PROC_FS | |
814 | if6_proc_exit(); | |
815 | ac6_proc_exit(); | |
816 | ipv6_misc_proc_exit(); | |
817 | udp6_proc_exit(); | |
818 | tcp6_proc_exit(); | |
819 | raw6_proc_exit(); | |
820 | #endif | |
821 | /* Cleanup code parts. */ | |
822 | sit_cleanup(); | |
823 | ip6_flowlabel_cleanup(); | |
824 | addrconf_cleanup(); | |
825 | ip6_route_cleanup(); | |
826 | ipv6_packet_cleanup(); | |
827 | igmp6_cleanup(); | |
828 | ipv6_netfilter_fini(); | |
829 | ndisc_cleanup(); | |
830 | icmpv6_cleanup(); | |
831 | #ifdef CONFIG_SYSCTL | |
832 | ipv6_sysctl_unregister(); | |
833 | #endif | |
834 | cleanup_ipv6_mibs(); | |
835 | proto_unregister(&rawv6_prot); | |
836 | proto_unregister(&udpv6_prot); | |
837 | proto_unregister(&tcpv6_prot); | |
838 | } | |
839 | module_exit(inet6_exit); | |
840 | ||
841 | MODULE_ALIAS_NETPROTO(PF_INET6); |