Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * PF_INET6 socket protocol family | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
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/timer.h> |
32 | #include <linux/string.h> | |
33 | #include <linux/sockios.h> | |
34 | #include <linux/net.h> | |
35 | #include <linux/fcntl.h> | |
36 | #include <linux/mm.h> | |
37 | #include <linux/interrupt.h> | |
38 | #include <linux/proc_fs.h> | |
39 | #include <linux/stat.h> | |
40 | #include <linux/init.h> | |
41 | ||
42 | #include <linux/inet.h> | |
43 | #include <linux/netdevice.h> | |
44 | #include <linux/icmpv6.h> | |
2cc7d573 | 45 | #include <linux/netfilter_ipv6.h> |
1da177e4 LT |
46 | |
47 | #include <net/ip.h> | |
48 | #include <net/ipv6.h> | |
49 | #include <net/udp.h> | |
ba4e58ec | 50 | #include <net/udplite.h> |
1da177e4 LT |
51 | #include <net/tcp.h> |
52 | #include <net/ipip.h> | |
53 | #include <net/protocol.h> | |
54 | #include <net/inet_common.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 | ||
65 | MODULE_AUTHOR("Cast of dozens"); | |
66 | MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); | |
67 | MODULE_LICENSE("GPL"); | |
68 | ||
f1267347 | 69 | /* The inetsw6 table contains everything that inet6_create needs to |
1da177e4 LT |
70 | * build a new socket. |
71 | */ | |
72 | static struct list_head inetsw6[SOCK_MAX]; | |
73 | static DEFINE_SPINLOCK(inetsw6_lock); | |
74 | ||
e71e0349 DL |
75 | void ipv6_frag_sysctl_init(struct net *net); |
76 | ||
1da177e4 LT |
77 | static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) |
78 | { | |
79 | const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); | |
80 | ||
81 | return (struct ipv6_pinfo *)(((u8 *)sk) + offset); | |
82 | } | |
83 | ||
1b8d7ae4 | 84 | static int inet6_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
85 | { |
86 | struct inet_sock *inet; | |
87 | struct ipv6_pinfo *np; | |
88 | struct sock *sk; | |
89 | struct list_head *p; | |
90 | struct inet_protosw *answer; | |
91 | struct proto *answer_prot; | |
92 | unsigned char answer_flags; | |
93 | char answer_no_check; | |
af1afe86 YH |
94 | int try_loading_module = 0; |
95 | int err; | |
1da177e4 | 96 | |
1b8d7ae4 EB |
97 | if (net != &init_net) |
98 | return -EAFNOSUPPORT; | |
99 | ||
b3da2cf3 DM |
100 | if (sock->type != SOCK_RAW && |
101 | sock->type != SOCK_DGRAM && | |
102 | !inet_ehash_secret) | |
103 | build_ehash_secret(); | |
104 | ||
1da177e4 LT |
105 | /* Look for the requested type/protocol pair. */ |
106 | answer = NULL; | |
af1afe86 YH |
107 | lookup_protocol: |
108 | err = -ESOCKTNOSUPPORT; | |
1da177e4 LT |
109 | rcu_read_lock(); |
110 | list_for_each_rcu(p, &inetsw6[sock->type]) { | |
111 | answer = list_entry(p, struct inet_protosw, list); | |
112 | ||
113 | /* Check the non-wild match. */ | |
114 | if (protocol == answer->protocol) { | |
115 | if (protocol != IPPROTO_IP) | |
116 | break; | |
117 | } else { | |
118 | /* Check for the two wild cases. */ | |
119 | if (IPPROTO_IP == protocol) { | |
120 | protocol = answer->protocol; | |
121 | break; | |
122 | } | |
123 | if (IPPROTO_IP == answer->protocol) | |
124 | break; | |
125 | } | |
af1afe86 | 126 | err = -EPROTONOSUPPORT; |
1da177e4 LT |
127 | answer = NULL; |
128 | } | |
129 | ||
af1afe86 YH |
130 | if (!answer) { |
131 | if (try_loading_module < 2) { | |
132 | rcu_read_unlock(); | |
133 | /* | |
134 | * Be more specific, e.g. net-pf-10-proto-132-type-1 | |
135 | * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) | |
136 | */ | |
137 | if (++try_loading_module == 1) | |
138 | request_module("net-pf-%d-proto-%d-type-%d", | |
139 | PF_INET6, protocol, sock->type); | |
140 | /* | |
141 | * Fall back to generic, e.g. net-pf-10-proto-132 | |
142 | * (net-pf-PF_INET6-proto-IPPROTO_SCTP) | |
143 | */ | |
144 | else | |
145 | request_module("net-pf-%d-proto-%d", | |
146 | PF_INET6, protocol); | |
147 | goto lookup_protocol; | |
148 | } else | |
149 | goto out_rcu_unlock; | |
150 | } | |
151 | ||
152 | err = -EPERM; | |
1da177e4 LT |
153 | if (answer->capability > 0 && !capable(answer->capability)) |
154 | goto out_rcu_unlock; | |
1da177e4 LT |
155 | |
156 | sock->ops = answer->ops; | |
1da177e4 LT |
157 | answer_prot = answer->prot; |
158 | answer_no_check = answer->no_check; | |
159 | answer_flags = answer->flags; | |
160 | rcu_read_unlock(); | |
161 | ||
162 | BUG_TRAP(answer_prot->slab != NULL); | |
163 | ||
af1afe86 | 164 | err = -ENOBUFS; |
6257ff21 | 165 | sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot); |
1da177e4 LT |
166 | if (sk == NULL) |
167 | goto out; | |
168 | ||
169 | sock_init_data(sock, sk); | |
170 | ||
af1afe86 | 171 | err = 0; |
1da177e4 LT |
172 | sk->sk_no_check = answer_no_check; |
173 | if (INET_PROTOSW_REUSE & answer_flags) | |
174 | sk->sk_reuse = 1; | |
175 | ||
176 | inet = inet_sk(sk); | |
469de9b9 | 177 | inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; |
1da177e4 LT |
178 | |
179 | if (SOCK_RAW == sock->type) { | |
180 | inet->num = protocol; | |
181 | if (IPPROTO_RAW == protocol) | |
182 | inet->hdrincl = 1; | |
183 | } | |
184 | ||
e6848976 | 185 | sk->sk_destruct = inet_sock_destruct; |
1da177e4 LT |
186 | sk->sk_family = PF_INET6; |
187 | sk->sk_protocol = protocol; | |
188 | ||
189 | sk->sk_backlog_rcv = answer->prot->backlog_rcv; | |
190 | ||
191 | inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); | |
192 | np->hop_limit = -1; | |
193 | np->mcast_hops = -1; | |
194 | np->mc_loop = 1; | |
195 | np->pmtudisc = IPV6_PMTUDISC_WANT; | |
99bc9c4e | 196 | np->ipv6only = init_net.ipv6.sysctl.bindv6only; |
1ab1457c | 197 | |
1da177e4 LT |
198 | /* Init the ipv4 part of the socket since we can have sockets |
199 | * using v6 API for ipv4. | |
200 | */ | |
201 | inet->uc_ttl = -1; | |
202 | ||
203 | inet->mc_loop = 1; | |
204 | inet->mc_ttl = 1; | |
205 | inet->mc_index = 0; | |
206 | inet->mc_list = NULL; | |
207 | ||
208 | if (ipv4_config.no_pmtu_disc) | |
209 | inet->pmtudisc = IP_PMTUDISC_DONT; | |
210 | else | |
211 | inet->pmtudisc = IP_PMTUDISC_WANT; | |
1ab1457c | 212 | /* |
e6848976 ACM |
213 | * Increment only the relevant sk_prot->socks debug field, this changes |
214 | * the previous behaviour of incrementing both the equivalent to | |
215 | * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. | |
216 | * | |
217 | * This allows better debug granularity as we'll know exactly how many | |
218 | * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 | |
219 | * transport protocol socks. -acme | |
220 | */ | |
221 | sk_refcnt_debug_inc(sk); | |
1da177e4 | 222 | |
1da177e4 LT |
223 | if (inet->num) { |
224 | /* It assumes that any protocol which allows | |
225 | * the user to assign a number at socket | |
226 | * creation time automatically shares. | |
227 | */ | |
e69a4adc | 228 | inet->sport = htons(inet->num); |
1da177e4 LT |
229 | sk->sk_prot->hash(sk); |
230 | } | |
231 | if (sk->sk_prot->init) { | |
af1afe86 YH |
232 | err = sk->sk_prot->init(sk); |
233 | if (err) { | |
1da177e4 LT |
234 | sk_common_release(sk); |
235 | goto out; | |
236 | } | |
237 | } | |
238 | out: | |
af1afe86 | 239 | return err; |
1da177e4 LT |
240 | out_rcu_unlock: |
241 | rcu_read_unlock(); | |
242 | goto out; | |
243 | } | |
244 | ||
245 | ||
246 | /* bind for INET6 API */ | |
247 | int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
248 | { | |
249 | struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr; | |
250 | struct sock *sk = sock->sk; | |
251 | struct inet_sock *inet = inet_sk(sk); | |
252 | struct ipv6_pinfo *np = inet6_sk(sk); | |
fd683222 | 253 | __be32 v4addr = 0; |
1da177e4 LT |
254 | unsigned short snum; |
255 | int addr_type = 0; | |
256 | int err = 0; | |
257 | ||
258 | /* If the socket has its own bind function then use it. */ | |
259 | if (sk->sk_prot->bind) | |
260 | return sk->sk_prot->bind(sk, uaddr, addr_len); | |
261 | ||
262 | if (addr_len < SIN6_LEN_RFC2133) | |
263 | return -EINVAL; | |
264 | addr_type = ipv6_addr_type(&addr->sin6_addr); | |
265 | if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) | |
266 | return -EINVAL; | |
267 | ||
268 | snum = ntohs(addr->sin6_port); | |
269 | if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) | |
270 | return -EACCES; | |
271 | ||
272 | lock_sock(sk); | |
273 | ||
274 | /* Check these errors (active socket, double bind). */ | |
275 | if (sk->sk_state != TCP_CLOSE || inet->num) { | |
276 | err = -EINVAL; | |
277 | goto out; | |
278 | } | |
279 | ||
280 | /* Check if the address belongs to the host. */ | |
281 | if (addr_type == IPV6_ADDR_MAPPED) { | |
282 | v4addr = addr->sin6_addr.s6_addr32[3]; | |
6b175b26 | 283 | if (inet_addr_type(&init_net, v4addr) != RTN_LOCAL) { |
1da177e4 LT |
284 | err = -EADDRNOTAVAIL; |
285 | goto out; | |
286 | } | |
287 | } else { | |
288 | if (addr_type != IPV6_ADDR_ANY) { | |
289 | struct net_device *dev = NULL; | |
290 | ||
291 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
292 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
293 | addr->sin6_scope_id) { | |
294 | /* Override any existing binding, if another one | |
295 | * is supplied by user. | |
296 | */ | |
297 | sk->sk_bound_dev_if = addr->sin6_scope_id; | |
298 | } | |
1ab1457c | 299 | |
1da177e4 LT |
300 | /* Binding to link-local address requires an interface */ |
301 | if (!sk->sk_bound_dev_if) { | |
302 | err = -EINVAL; | |
303 | goto out; | |
304 | } | |
881d966b | 305 | dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if); |
1da177e4 LT |
306 | if (!dev) { |
307 | err = -ENODEV; | |
308 | goto out; | |
309 | } | |
310 | } | |
311 | ||
312 | /* ipv4 addr of the socket is invalid. Only the | |
313 | * unspecified and mapped address have a v4 equivalent. | |
314 | */ | |
315 | v4addr = LOOPBACK4_IPV6; | |
316 | if (!(addr_type & IPV6_ADDR_MULTICAST)) { | |
bfeade08 DL |
317 | if (!ipv6_chk_addr(&init_net, &addr->sin6_addr, |
318 | dev, 0)) { | |
1da177e4 LT |
319 | if (dev) |
320 | dev_put(dev); | |
321 | err = -EADDRNOTAVAIL; | |
322 | goto out; | |
323 | } | |
324 | } | |
325 | if (dev) | |
326 | dev_put(dev); | |
327 | } | |
328 | } | |
329 | ||
330 | inet->rcv_saddr = v4addr; | |
331 | inet->saddr = v4addr; | |
332 | ||
333 | ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); | |
1ab1457c | 334 | |
1da177e4 LT |
335 | if (!(addr_type & IPV6_ADDR_MULTICAST)) |
336 | ipv6_addr_copy(&np->saddr, &addr->sin6_addr); | |
337 | ||
338 | /* Make sure we are allowed to bind here. */ | |
339 | if (sk->sk_prot->get_port(sk, snum)) { | |
340 | inet_reset_saddr(sk); | |
341 | err = -EADDRINUSE; | |
342 | goto out; | |
343 | } | |
344 | ||
345 | if (addr_type != IPV6_ADDR_ANY) | |
346 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; | |
347 | if (snum) | |
348 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
e69a4adc | 349 | inet->sport = htons(inet->num); |
1da177e4 LT |
350 | inet->dport = 0; |
351 | inet->daddr = 0; | |
352 | out: | |
353 | release_sock(sk); | |
354 | return err; | |
355 | } | |
356 | ||
7159039a YH |
357 | EXPORT_SYMBOL(inet6_bind); |
358 | ||
1da177e4 LT |
359 | int inet6_release(struct socket *sock) |
360 | { | |
361 | struct sock *sk = sock->sk; | |
362 | ||
363 | if (sk == NULL) | |
364 | return -EINVAL; | |
365 | ||
366 | /* Free mc lists */ | |
367 | ipv6_sock_mc_close(sk); | |
368 | ||
369 | /* Free ac lists */ | |
370 | ipv6_sock_ac_close(sk); | |
371 | ||
372 | return inet_release(sock); | |
373 | } | |
374 | ||
7159039a YH |
375 | EXPORT_SYMBOL(inet6_release); |
376 | ||
1da177e4 LT |
377 | int inet6_destroy_sock(struct sock *sk) |
378 | { | |
379 | struct ipv6_pinfo *np = inet6_sk(sk); | |
380 | struct sk_buff *skb; | |
381 | struct ipv6_txoptions *opt; | |
382 | ||
1da177e4 LT |
383 | /* Release rx options */ |
384 | ||
385 | if ((skb = xchg(&np->pktoptions, NULL)) != NULL) | |
386 | kfree_skb(skb); | |
387 | ||
388 | /* Free flowlabels */ | |
389 | fl6_free_socklist(sk); | |
390 | ||
391 | /* Free tx options */ | |
392 | ||
393 | if ((opt = xchg(&np->opt, NULL)) != NULL) | |
394 | sock_kfree_s(sk, opt, opt->tot_len); | |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
3cf3dc6c ACM |
399 | EXPORT_SYMBOL_GPL(inet6_destroy_sock); |
400 | ||
1da177e4 LT |
401 | /* |
402 | * This does both peername and sockname. | |
403 | */ | |
1ab1457c | 404 | |
1da177e4 LT |
405 | int inet6_getname(struct socket *sock, struct sockaddr *uaddr, |
406 | int *uaddr_len, int peer) | |
407 | { | |
408 | struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; | |
409 | struct sock *sk = sock->sk; | |
410 | struct inet_sock *inet = inet_sk(sk); | |
411 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1ab1457c | 412 | |
1da177e4 LT |
413 | sin->sin6_family = AF_INET6; |
414 | sin->sin6_flowinfo = 0; | |
415 | sin->sin6_scope_id = 0; | |
416 | if (peer) { | |
417 | if (!inet->dport) | |
418 | return -ENOTCONN; | |
419 | if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && | |
420 | peer == 1) | |
421 | return -ENOTCONN; | |
422 | sin->sin6_port = inet->dport; | |
423 | ipv6_addr_copy(&sin->sin6_addr, &np->daddr); | |
424 | if (np->sndflow) | |
425 | sin->sin6_flowinfo = np->flow_label; | |
426 | } else { | |
427 | if (ipv6_addr_any(&np->rcv_saddr)) | |
428 | ipv6_addr_copy(&sin->sin6_addr, &np->saddr); | |
429 | else | |
430 | ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); | |
431 | ||
432 | sin->sin6_port = inet->sport; | |
433 | } | |
434 | if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
435 | sin->sin6_scope_id = sk->sk_bound_dev_if; | |
436 | *uaddr_len = sizeof(*sin); | |
437 | return(0); | |
438 | } | |
439 | ||
7159039a YH |
440 | EXPORT_SYMBOL(inet6_getname); |
441 | ||
1da177e4 LT |
442 | int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
443 | { | |
444 | struct sock *sk = sock->sk; | |
1da177e4 | 445 | |
1ab1457c | 446 | switch(cmd) |
1da177e4 LT |
447 | { |
448 | case SIOCGSTAMP: | |
449 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
450 | ||
ae40eb1e ED |
451 | case SIOCGSTAMPNS: |
452 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
453 | ||
1da177e4 LT |
454 | case SIOCADDRT: |
455 | case SIOCDELRT: | |
1ab1457c | 456 | |
1da177e4 LT |
457 | return(ipv6_route_ioctl(cmd,(void __user *)arg)); |
458 | ||
459 | case SIOCSIFADDR: | |
460 | return addrconf_add_ifaddr((void __user *) arg); | |
461 | case SIOCDIFADDR: | |
462 | return addrconf_del_ifaddr((void __user *) arg); | |
463 | case SIOCSIFDSTADDR: | |
464 | return addrconf_set_dstaddr((void __user *) arg); | |
465 | default: | |
b5e5fa5e CH |
466 | if (!sk->sk_prot->ioctl) |
467 | return -ENOIOCTLCMD; | |
468 | return sk->sk_prot->ioctl(sk, cmd, arg); | |
1da177e4 LT |
469 | } |
470 | /*NOTREACHED*/ | |
471 | return(0); | |
472 | } | |
473 | ||
7159039a YH |
474 | EXPORT_SYMBOL(inet6_ioctl); |
475 | ||
90ddc4f0 | 476 | const struct proto_ops inet6_stream_ops = { |
543d9cfe ACM |
477 | .family = PF_INET6, |
478 | .owner = THIS_MODULE, | |
479 | .release = inet6_release, | |
480 | .bind = inet6_bind, | |
481 | .connect = inet_stream_connect, /* ok */ | |
482 | .socketpair = sock_no_socketpair, /* a do nothing */ | |
483 | .accept = inet_accept, /* ok */ | |
484 | .getname = inet6_getname, | |
485 | .poll = tcp_poll, /* ok */ | |
486 | .ioctl = inet6_ioctl, /* must change */ | |
487 | .listen = inet_listen, /* ok */ | |
488 | .shutdown = inet_shutdown, /* ok */ | |
489 | .setsockopt = sock_common_setsockopt, /* ok */ | |
490 | .getsockopt = sock_common_getsockopt, /* ok */ | |
3516ffb0 | 491 | .sendmsg = tcp_sendmsg, /* ok */ |
543d9cfe ACM |
492 | .recvmsg = sock_common_recvmsg, /* ok */ |
493 | .mmap = sock_no_mmap, | |
494 | .sendpage = tcp_sendpage, | |
a0974dd3 | 495 | .splice_read = tcp_splice_read, |
3fdadf7d | 496 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
497 | .compat_setsockopt = compat_sock_common_setsockopt, |
498 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 499 | #endif |
1da177e4 LT |
500 | }; |
501 | ||
90ddc4f0 | 502 | const struct proto_ops inet6_dgram_ops = { |
543d9cfe ACM |
503 | .family = PF_INET6, |
504 | .owner = THIS_MODULE, | |
505 | .release = inet6_release, | |
506 | .bind = inet6_bind, | |
507 | .connect = inet_dgram_connect, /* ok */ | |
508 | .socketpair = sock_no_socketpair, /* a do nothing */ | |
509 | .accept = sock_no_accept, /* a do nothing */ | |
510 | .getname = inet6_getname, | |
511 | .poll = udp_poll, /* ok */ | |
512 | .ioctl = inet6_ioctl, /* must change */ | |
513 | .listen = sock_no_listen, /* ok */ | |
514 | .shutdown = inet_shutdown, /* ok */ | |
515 | .setsockopt = sock_common_setsockopt, /* ok */ | |
516 | .getsockopt = sock_common_getsockopt, /* ok */ | |
517 | .sendmsg = inet_sendmsg, /* ok */ | |
518 | .recvmsg = sock_common_recvmsg, /* ok */ | |
519 | .mmap = sock_no_mmap, | |
520 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 521 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
522 | .compat_setsockopt = compat_sock_common_setsockopt, |
523 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 524 | #endif |
1da177e4 LT |
525 | }; |
526 | ||
527 | static struct net_proto_family inet6_family_ops = { | |
528 | .family = PF_INET6, | |
529 | .create = inet6_create, | |
530 | .owner = THIS_MODULE, | |
531 | }; | |
532 | ||
87c3efbf | 533 | int inet6_register_protosw(struct inet_protosw *p) |
1da177e4 LT |
534 | { |
535 | struct list_head *lh; | |
536 | struct inet_protosw *answer; | |
1da177e4 | 537 | struct list_head *last_perm; |
87c3efbf DL |
538 | int protocol = p->protocol; |
539 | int ret; | |
1da177e4 LT |
540 | |
541 | spin_lock_bh(&inetsw6_lock); | |
542 | ||
87c3efbf | 543 | ret = -EINVAL; |
1da177e4 LT |
544 | if (p->type >= SOCK_MAX) |
545 | goto out_illegal; | |
546 | ||
547 | /* If we are trying to override a permanent protocol, bail. */ | |
548 | answer = NULL; | |
87c3efbf | 549 | ret = -EPERM; |
1da177e4 LT |
550 | last_perm = &inetsw6[p->type]; |
551 | list_for_each(lh, &inetsw6[p->type]) { | |
552 | answer = list_entry(lh, struct inet_protosw, list); | |
553 | ||
554 | /* Check only the non-wild match. */ | |
555 | if (INET_PROTOSW_PERMANENT & answer->flags) { | |
556 | if (protocol == answer->protocol) | |
557 | break; | |
558 | last_perm = lh; | |
559 | } | |
560 | ||
561 | answer = NULL; | |
562 | } | |
563 | if (answer) | |
564 | goto out_permanent; | |
565 | ||
566 | /* Add the new entry after the last permanent entry if any, so that | |
567 | * the new entry does not override a permanent entry when matched with | |
568 | * a wild-card protocol. But it is allowed to override any existing | |
1ab1457c | 569 | * non-permanent entry. This means that when we remove this entry, the |
1da177e4 LT |
570 | * system automatically returns to the old behavior. |
571 | */ | |
572 | list_add_rcu(&p->list, last_perm); | |
87c3efbf | 573 | ret = 0; |
1da177e4 LT |
574 | out: |
575 | spin_unlock_bh(&inetsw6_lock); | |
87c3efbf | 576 | return ret; |
1da177e4 LT |
577 | |
578 | out_permanent: | |
579 | printk(KERN_ERR "Attempt to override permanent protocol %d.\n", | |
580 | protocol); | |
581 | goto out; | |
582 | ||
583 | out_illegal: | |
584 | printk(KERN_ERR | |
585 | "Ignoring attempt to register invalid socket type %d.\n", | |
586 | p->type); | |
587 | goto out; | |
588 | } | |
589 | ||
7159039a YH |
590 | EXPORT_SYMBOL(inet6_register_protosw); |
591 | ||
1da177e4 LT |
592 | void |
593 | inet6_unregister_protosw(struct inet_protosw *p) | |
594 | { | |
595 | if (INET_PROTOSW_PERMANENT & p->flags) { | |
596 | printk(KERN_ERR | |
597 | "Attempt to unregister permanent protocol %d.\n", | |
598 | p->protocol); | |
599 | } else { | |
600 | spin_lock_bh(&inetsw6_lock); | |
601 | list_del_rcu(&p->list); | |
602 | spin_unlock_bh(&inetsw6_lock); | |
603 | ||
604 | synchronize_net(); | |
605 | } | |
606 | } | |
607 | ||
7159039a YH |
608 | EXPORT_SYMBOL(inet6_unregister_protosw); |
609 | ||
b9750ce1 ACM |
610 | int inet6_sk_rebuild_header(struct sock *sk) |
611 | { | |
612 | int err; | |
613 | struct dst_entry *dst; | |
614 | struct ipv6_pinfo *np = inet6_sk(sk); | |
615 | ||
616 | dst = __sk_dst_check(sk, np->dst_cookie); | |
617 | ||
618 | if (dst == NULL) { | |
619 | struct inet_sock *inet = inet_sk(sk); | |
620 | struct in6_addr *final_p = NULL, final; | |
621 | struct flowi fl; | |
622 | ||
623 | memset(&fl, 0, sizeof(fl)); | |
624 | fl.proto = sk->sk_protocol; | |
625 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
626 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
627 | fl.fl6_flowlabel = np->flow_label; | |
628 | fl.oif = sk->sk_bound_dev_if; | |
629 | fl.fl_ip_dport = inet->dport; | |
630 | fl.fl_ip_sport = inet->sport; | |
beb8d13b | 631 | security_sk_classify_flow(sk, &fl); |
b9750ce1 ACM |
632 | |
633 | if (np->opt && np->opt->srcrt) { | |
634 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; | |
635 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
636 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
637 | final_p = &final; | |
638 | } | |
639 | ||
640 | err = ip6_dst_lookup(sk, &dst, &fl); | |
641 | if (err) { | |
642 | sk->sk_route_caps = 0; | |
643 | return err; | |
644 | } | |
645 | if (final_p) | |
646 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
647 | ||
648 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
649 | sk->sk_err_soft = -err; | |
650 | return err; | |
651 | } | |
652 | ||
8e1ef0a9 | 653 | __ip6_dst_store(sk, dst, NULL, NULL); |
b9750ce1 ACM |
654 | } |
655 | ||
656 | return 0; | |
657 | } | |
658 | ||
659 | EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); | |
660 | ||
399c07de ACM |
661 | int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) |
662 | { | |
663 | struct ipv6_pinfo *np = inet6_sk(sk); | |
664 | struct inet6_skb_parm *opt = IP6CB(skb); | |
665 | ||
666 | if (np->rxopt.all) { | |
667 | if ((opt->hop && (np->rxopt.bits.hopopts || | |
668 | np->rxopt.bits.ohopopts)) || | |
d56f90a7 ACM |
669 | ((IPV6_FLOWINFO_MASK & |
670 | *(__be32 *)skb_network_header(skb)) && | |
399c07de ACM |
671 | np->rxopt.bits.rxflow) || |
672 | (opt->srcrt && (np->rxopt.bits.srcrt || | |
673 | np->rxopt.bits.osrcrt)) || | |
674 | ((opt->dst1 || opt->dst0) && | |
675 | (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) | |
676 | return 1; | |
677 | } | |
678 | return 0; | |
679 | } | |
680 | ||
681 | EXPORT_SYMBOL_GPL(ipv6_opt_accepted); | |
682 | ||
1da177e4 LT |
683 | static int __init init_ipv6_mibs(void) |
684 | { | |
c69bce20 YH |
685 | if (snmp_mib_init((void **)ipv6_statistics, |
686 | sizeof(struct ipstats_mib)) < 0) | |
1da177e4 | 687 | goto err_ip_mib; |
c69bce20 YH |
688 | if (snmp_mib_init((void **)icmpv6_statistics, |
689 | sizeof(struct icmpv6_mib)) < 0) | |
1da177e4 | 690 | goto err_icmp_mib; |
14878f75 | 691 | if (snmp_mib_init((void **)icmpv6msg_statistics, |
c69bce20 | 692 | sizeof(struct icmpv6msg_mib)) < 0) |
14878f75 | 693 | goto err_icmpmsg_mib; |
c69bce20 | 694 | if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0) |
1da177e4 | 695 | goto err_udp_mib; |
c69bce20 YH |
696 | if (snmp_mib_init((void **)udplite_stats_in6, |
697 | sizeof (struct udp_mib)) < 0) | |
ba4e58ec | 698 | goto err_udplite_mib; |
1da177e4 LT |
699 | return 0; |
700 | ||
ba4e58ec | 701 | err_udplite_mib: |
7f7d9a6b | 702 | snmp_mib_free((void **)udp_stats_in6); |
1da177e4 | 703 | err_udp_mib: |
14878f75 DS |
704 | snmp_mib_free((void **)icmpv6msg_statistics); |
705 | err_icmpmsg_mib: | |
7f7d9a6b | 706 | snmp_mib_free((void **)icmpv6_statistics); |
1da177e4 | 707 | err_icmp_mib: |
7f7d9a6b | 708 | snmp_mib_free((void **)ipv6_statistics); |
1da177e4 LT |
709 | err_ip_mib: |
710 | return -ENOMEM; | |
1ab1457c | 711 | |
1da177e4 LT |
712 | } |
713 | ||
714 | static void cleanup_ipv6_mibs(void) | |
715 | { | |
7f7d9a6b HX |
716 | snmp_mib_free((void **)ipv6_statistics); |
717 | snmp_mib_free((void **)icmpv6_statistics); | |
dc8a82ad | 718 | snmp_mib_free((void **)icmpv6msg_statistics); |
7f7d9a6b HX |
719 | snmp_mib_free((void **)udp_stats_in6); |
720 | snmp_mib_free((void **)udplite_stats_in6); | |
1da177e4 LT |
721 | } |
722 | ||
81c1c178 DL |
723 | static int inet6_net_init(struct net *net) |
724 | { | |
99bc9c4e | 725 | net->ipv6.sysctl.bindv6only = 0; |
e71e0349 DL |
726 | net->ipv6.sysctl.frags.high_thresh = 256 * 1024; |
727 | net->ipv6.sysctl.frags.low_thresh = 192 * 1024; | |
728 | net->ipv6.sysctl.frags.timeout = IPV6_FRAG_TIMEOUT; | |
729 | net->ipv6.sysctl.frags.secret_interval = 10 * 60 * HZ; | |
4990509f DL |
730 | net->ipv6.sysctl.flush_delay = 0; |
731 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
732 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
733 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
734 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
735 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
736 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
737 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
41a76906 | 738 | net->ipv6.sysctl.icmpv6_time = 1*HZ; |
e71e0349 DL |
739 | ipv6_frag_sysctl_init(net); |
740 | ||
81c1c178 DL |
741 | return 0; |
742 | } | |
743 | ||
744 | static void inet6_net_exit(struct net *net) | |
745 | { | |
746 | return; | |
747 | } | |
748 | ||
749 | static struct pernet_operations inet6_net_ops = { | |
750 | .init = inet6_net_init, | |
751 | .exit = inet6_net_exit, | |
752 | }; | |
753 | ||
1da177e4 LT |
754 | static int __init inet6_init(void) |
755 | { | |
756 | struct sk_buff *dummy_skb; | |
1ab1457c | 757 | struct list_head *r; |
1da177e4 LT |
758 | int err; |
759 | ||
ef047f5e YH |
760 | BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); |
761 | ||
1da177e4 LT |
762 | #ifdef MODULE |
763 | #if 0 /* FIXME --RR */ | |
764 | if (!mod_member_present(&__this_module, can_unload)) | |
765 | return -EINVAL; | |
766 | ||
767 | __this_module.can_unload = &ipv6_unload; | |
768 | #endif | |
769 | #endif | |
1da177e4 LT |
770 | err = proto_register(&tcpv6_prot, 1); |
771 | if (err) | |
772 | goto out; | |
773 | ||
774 | err = proto_register(&udpv6_prot, 1); | |
775 | if (err) | |
776 | goto out_unregister_tcp_proto; | |
777 | ||
ba4e58ec | 778 | err = proto_register(&udplitev6_prot, 1); |
1da177e4 LT |
779 | if (err) |
780 | goto out_unregister_udp_proto; | |
781 | ||
ba4e58ec GR |
782 | err = proto_register(&rawv6_prot, 1); |
783 | if (err) | |
784 | goto out_unregister_udplite_proto; | |
785 | ||
1da177e4 LT |
786 | |
787 | /* Register the socket-side information for inet6_create. */ | |
788 | for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) | |
789 | INIT_LIST_HEAD(r); | |
790 | ||
791 | /* We MUST register RAW sockets before we create the ICMP6, | |
792 | * IGMP6, or NDISC control sockets. | |
793 | */ | |
7f4e4868 DL |
794 | err = rawv6_init(); |
795 | if (err) | |
796 | goto out_unregister_raw_proto; | |
1da177e4 LT |
797 | |
798 | /* Register the family here so that the init calls below will | |
799 | * be able to create sockets. (?? is this dangerous ??) | |
800 | */ | |
8eb55910 DM |
801 | err = sock_register(&inet6_family_ops); |
802 | if (err) | |
7f4e4868 | 803 | goto out_sock_register_fail; |
1da177e4 LT |
804 | |
805 | /* Initialise ipv6 mibs */ | |
806 | err = init_ipv6_mibs(); | |
807 | if (err) | |
8eb55910 | 808 | goto out_unregister_sock; |
1ab1457c | 809 | |
1da177e4 LT |
810 | /* |
811 | * ipngwg API draft makes clear that the correct semantics | |
812 | * for TCP and UDP is to consider one TCP and UDP instance | |
813 | * in a host availiable by both INET and INET6 APIs and | |
814 | * able to communicate via both network protocols. | |
815 | */ | |
816 | ||
81c1c178 DL |
817 | err = register_pernet_subsys(&inet6_net_ops); |
818 | if (err) | |
819 | goto register_pernet_fail; | |
820 | ||
1da177e4 | 821 | #ifdef CONFIG_SYSCTL |
291480c0 DL |
822 | err = ipv6_sysctl_register(); |
823 | if (err) | |
824 | goto sysctl_fail; | |
1da177e4 LT |
825 | #endif |
826 | err = icmpv6_init(&inet6_family_ops); | |
827 | if (err) | |
828 | goto icmp_fail; | |
829 | err = ndisc_init(&inet6_family_ops); | |
830 | if (err) | |
831 | goto ndisc_fail; | |
832 | err = igmp6_init(&inet6_family_ops); | |
833 | if (err) | |
834 | goto igmp_fail; | |
2cc7d573 HW |
835 | err = ipv6_netfilter_init(); |
836 | if (err) | |
837 | goto netfilter_fail; | |
1da177e4 LT |
838 | /* Create /proc/foo6 entries. */ |
839 | #ifdef CONFIG_PROC_FS | |
840 | err = -ENOMEM; | |
841 | if (raw6_proc_init()) | |
842 | goto proc_raw6_fail; | |
843 | if (tcp6_proc_init()) | |
844 | goto proc_tcp6_fail; | |
845 | if (udp6_proc_init()) | |
846 | goto proc_udp6_fail; | |
ba4e58ec GR |
847 | if (udplite6_proc_init()) |
848 | goto proc_udplite6_fail; | |
1da177e4 LT |
849 | if (ipv6_misc_proc_init()) |
850 | goto proc_misc6_fail; | |
851 | ||
852 | if (ac6_proc_init()) | |
853 | goto proc_anycast6_fail; | |
854 | if (if6_proc_init()) | |
855 | goto proc_if6_fail; | |
856 | #endif | |
e2fddf5e DL |
857 | err = ip6_route_init(); |
858 | if (err) | |
859 | goto ip6_route_fail; | |
0a3e78ac DL |
860 | err = ip6_flowlabel_init(); |
861 | if (err) | |
862 | goto ip6_flowlabel_fail; | |
1da177e4 LT |
863 | err = addrconf_init(); |
864 | if (err) | |
865 | goto addrconf_fail; | |
1da177e4 LT |
866 | |
867 | /* Init v6 extension headers. */ | |
248b238d DL |
868 | err = ipv6_exthdrs_init(); |
869 | if (err) | |
870 | goto ipv6_exthdrs_fail; | |
871 | ||
853cbbaa DL |
872 | err = ipv6_frag_init(); |
873 | if (err) | |
874 | goto ipv6_frag_fail; | |
1da177e4 LT |
875 | |
876 | /* Init v6 transport protocols. */ | |
7f4e4868 DL |
877 | err = udpv6_init(); |
878 | if (err) | |
879 | goto udpv6_fail; | |
e2ed4052 | 880 | |
7f4e4868 DL |
881 | err = udplitev6_init(); |
882 | if (err) | |
883 | goto udplitev6_fail; | |
884 | ||
885 | err = tcpv6_init(); | |
886 | if (err) | |
887 | goto tcpv6_fail; | |
888 | ||
889 | err = ipv6_packet_init(); | |
890 | if (err) | |
891 | goto ipv6_packet_fail; | |
1da177e4 LT |
892 | out: |
893 | return err; | |
894 | ||
7f4e4868 DL |
895 | ipv6_packet_fail: |
896 | tcpv6_exit(); | |
897 | tcpv6_fail: | |
898 | udplitev6_exit(); | |
899 | udplitev6_fail: | |
900 | udpv6_exit(); | |
901 | udpv6_fail: | |
902 | ipv6_frag_exit(); | |
853cbbaa DL |
903 | ipv6_frag_fail: |
904 | ipv6_exthdrs_exit(); | |
248b238d DL |
905 | ipv6_exthdrs_fail: |
906 | addrconf_cleanup(); | |
1da177e4 LT |
907 | addrconf_fail: |
908 | ip6_flowlabel_cleanup(); | |
0a3e78ac | 909 | ip6_flowlabel_fail: |
1da177e4 | 910 | ip6_route_cleanup(); |
e2fddf5e | 911 | ip6_route_fail: |
1da177e4 LT |
912 | #ifdef CONFIG_PROC_FS |
913 | if6_proc_exit(); | |
914 | proc_if6_fail: | |
915 | ac6_proc_exit(); | |
916 | proc_anycast6_fail: | |
917 | ipv6_misc_proc_exit(); | |
918 | proc_misc6_fail: | |
ba4e58ec GR |
919 | udplite6_proc_exit(); |
920 | proc_udplite6_fail: | |
1da177e4 LT |
921 | udp6_proc_exit(); |
922 | proc_udp6_fail: | |
923 | tcp6_proc_exit(); | |
924 | proc_tcp6_fail: | |
925 | raw6_proc_exit(); | |
926 | proc_raw6_fail: | |
927 | #endif | |
2cc7d573 HW |
928 | ipv6_netfilter_fini(); |
929 | netfilter_fail: | |
1da177e4 LT |
930 | igmp6_cleanup(); |
931 | igmp_fail: | |
932 | ndisc_cleanup(); | |
933 | ndisc_fail: | |
934 | icmpv6_cleanup(); | |
935 | icmp_fail: | |
936 | #ifdef CONFIG_SYSCTL | |
937 | ipv6_sysctl_unregister(); | |
291480c0 | 938 | sysctl_fail: |
1da177e4 | 939 | #endif |
81c1c178 DL |
940 | unregister_pernet_subsys(&inet6_net_ops); |
941 | register_pernet_fail: | |
1da177e4 | 942 | cleanup_ipv6_mibs(); |
8eb55910 DM |
943 | out_unregister_sock: |
944 | sock_unregister(PF_INET6); | |
e2fddf5e | 945 | rtnl_unregister_all(PF_INET6); |
7f4e4868 DL |
946 | out_sock_register_fail: |
947 | rawv6_exit(); | |
1da177e4 LT |
948 | out_unregister_raw_proto: |
949 | proto_unregister(&rawv6_prot); | |
ba4e58ec GR |
950 | out_unregister_udplite_proto: |
951 | proto_unregister(&udplitev6_prot); | |
1da177e4 LT |
952 | out_unregister_udp_proto: |
953 | proto_unregister(&udpv6_prot); | |
954 | out_unregister_tcp_proto: | |
955 | proto_unregister(&tcpv6_prot); | |
956 | goto out; | |
957 | } | |
958 | module_init(inet6_init); | |
959 | ||
960 | static void __exit inet6_exit(void) | |
961 | { | |
962 | /* First of all disallow new sockets creation. */ | |
963 | sock_unregister(PF_INET6); | |
c127ea2c TG |
964 | /* Disallow any further netlink messages */ |
965 | rtnl_unregister_all(PF_INET6); | |
ca17c233 | 966 | |
7f4e4868 DL |
967 | udpv6_exit(); |
968 | udplitev6_exit(); | |
969 | tcpv6_exit(); | |
970 | ||
ca17c233 JJ |
971 | /* Cleanup code parts. */ |
972 | ipv6_packet_cleanup(); | |
853cbbaa | 973 | ipv6_frag_exit(); |
248b238d | 974 | ipv6_exthdrs_exit(); |
ca17c233 JJ |
975 | addrconf_cleanup(); |
976 | ip6_flowlabel_cleanup(); | |
977 | ip6_route_cleanup(); | |
1da177e4 | 978 | #ifdef CONFIG_PROC_FS |
ca17c233 JJ |
979 | |
980 | /* Cleanup code parts. */ | |
1da177e4 LT |
981 | if6_proc_exit(); |
982 | ac6_proc_exit(); | |
1ab1457c | 983 | ipv6_misc_proc_exit(); |
1ab1457c | 984 | udplite6_proc_exit(); |
ca17c233 | 985 | udp6_proc_exit(); |
1ab1457c YH |
986 | tcp6_proc_exit(); |
987 | raw6_proc_exit(); | |
2c8d7ca0 | 988 | #endif |
2cc7d573 | 989 | ipv6_netfilter_fini(); |
ca17c233 | 990 | igmp6_cleanup(); |
1da177e4 LT |
991 | ndisc_cleanup(); |
992 | icmpv6_cleanup(); | |
7f4e4868 | 993 | rawv6_exit(); |
1da177e4 | 994 | #ifdef CONFIG_SYSCTL |
1ab1457c | 995 | ipv6_sysctl_unregister(); |
1da177e4 | 996 | #endif |
81c1c178 | 997 | unregister_pernet_subsys(&inet6_net_ops); |
1da177e4 LT |
998 | cleanup_ipv6_mibs(); |
999 | proto_unregister(&rawv6_prot); | |
ca17c233 | 1000 | proto_unregister(&udplitev6_prot); |
1da177e4 LT |
1001 | proto_unregister(&udpv6_prot); |
1002 | proto_unregister(&tcpv6_prot); | |
1003 | } | |
1004 | module_exit(inet6_exit); | |
1005 | ||
1006 | MODULE_ALIAS_NETPROTO(PF_INET6); |