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 | |
2c8d7ca0 NT |
61 | #ifdef CONFIG_IPV6_MIP6 |
62 | #include <net/mip6.h> | |
63 | #endif | |
1da177e4 LT |
64 | |
65 | #include <asm/uaccess.h> | |
66 | #include <asm/system.h> | |
67 | ||
68 | MODULE_AUTHOR("Cast of dozens"); | |
69 | MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); | |
70 | MODULE_LICENSE("GPL"); | |
71 | ||
ab32ea5d | 72 | int sysctl_ipv6_bindv6only __read_mostly; |
1da177e4 | 73 | |
1da177e4 LT |
74 | /* The inetsw table contains everything that inet_create needs to |
75 | * build a new socket. | |
76 | */ | |
77 | static struct list_head inetsw6[SOCK_MAX]; | |
78 | static DEFINE_SPINLOCK(inetsw6_lock); | |
79 | ||
1da177e4 LT |
80 | static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) |
81 | { | |
82 | const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); | |
83 | ||
84 | return (struct ipv6_pinfo *)(((u8 *)sk) + offset); | |
85 | } | |
86 | ||
87 | static int inet6_create(struct socket *sock, int protocol) | |
88 | { | |
89 | struct inet_sock *inet; | |
90 | struct ipv6_pinfo *np; | |
91 | struct sock *sk; | |
92 | struct list_head *p; | |
93 | struct inet_protosw *answer; | |
94 | struct proto *answer_prot; | |
95 | unsigned char answer_flags; | |
96 | char answer_no_check; | |
af1afe86 YH |
97 | int try_loading_module = 0; |
98 | int err; | |
1da177e4 | 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; |
1da177e4 LT |
165 | sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1); |
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; | |
196 | np->ipv6only = sysctl_ipv6_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]; | |
283 | if (inet_addr_type(v4addr) != RTN_LOCAL) { | |
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 | } | |
305 | dev = dev_get_by_index(sk->sk_bound_dev_if); | |
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)) { | |
317 | if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) { | |
318 | if (dev) | |
319 | dev_put(dev); | |
320 | err = -EADDRNOTAVAIL; | |
321 | goto out; | |
322 | } | |
323 | } | |
324 | if (dev) | |
325 | dev_put(dev); | |
326 | } | |
327 | } | |
328 | ||
329 | inet->rcv_saddr = v4addr; | |
330 | inet->saddr = v4addr; | |
331 | ||
332 | ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); | |
1ab1457c | 333 | |
1da177e4 LT |
334 | if (!(addr_type & IPV6_ADDR_MULTICAST)) |
335 | ipv6_addr_copy(&np->saddr, &addr->sin6_addr); | |
336 | ||
337 | /* Make sure we are allowed to bind here. */ | |
338 | if (sk->sk_prot->get_port(sk, snum)) { | |
339 | inet_reset_saddr(sk); | |
340 | err = -EADDRINUSE; | |
341 | goto out; | |
342 | } | |
343 | ||
344 | if (addr_type != IPV6_ADDR_ANY) | |
345 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; | |
346 | if (snum) | |
347 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
e69a4adc | 348 | inet->sport = htons(inet->num); |
1da177e4 LT |
349 | inet->dport = 0; |
350 | inet->daddr = 0; | |
351 | out: | |
352 | release_sock(sk); | |
353 | return err; | |
354 | } | |
355 | ||
7159039a YH |
356 | EXPORT_SYMBOL(inet6_bind); |
357 | ||
1da177e4 LT |
358 | int inet6_release(struct socket *sock) |
359 | { | |
360 | struct sock *sk = sock->sk; | |
361 | ||
362 | if (sk == NULL) | |
363 | return -EINVAL; | |
364 | ||
365 | /* Free mc lists */ | |
366 | ipv6_sock_mc_close(sk); | |
367 | ||
368 | /* Free ac lists */ | |
369 | ipv6_sock_ac_close(sk); | |
370 | ||
371 | return inet_release(sock); | |
372 | } | |
373 | ||
7159039a YH |
374 | EXPORT_SYMBOL(inet6_release); |
375 | ||
1da177e4 LT |
376 | int inet6_destroy_sock(struct sock *sk) |
377 | { | |
378 | struct ipv6_pinfo *np = inet6_sk(sk); | |
379 | struct sk_buff *skb; | |
380 | struct ipv6_txoptions *opt; | |
381 | ||
1da177e4 LT |
382 | /* Release rx options */ |
383 | ||
384 | if ((skb = xchg(&np->pktoptions, NULL)) != NULL) | |
385 | kfree_skb(skb); | |
386 | ||
387 | /* Free flowlabels */ | |
388 | fl6_free_socklist(sk); | |
389 | ||
390 | /* Free tx options */ | |
391 | ||
392 | if ((opt = xchg(&np->opt, NULL)) != NULL) | |
393 | sock_kfree_s(sk, opt, opt->tot_len); | |
394 | ||
395 | return 0; | |
396 | } | |
397 | ||
3cf3dc6c ACM |
398 | EXPORT_SYMBOL_GPL(inet6_destroy_sock); |
399 | ||
1da177e4 LT |
400 | /* |
401 | * This does both peername and sockname. | |
402 | */ | |
1ab1457c | 403 | |
1da177e4 LT |
404 | int inet6_getname(struct socket *sock, struct sockaddr *uaddr, |
405 | int *uaddr_len, int peer) | |
406 | { | |
407 | struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; | |
408 | struct sock *sk = sock->sk; | |
409 | struct inet_sock *inet = inet_sk(sk); | |
410 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1ab1457c | 411 | |
1da177e4 LT |
412 | sin->sin6_family = AF_INET6; |
413 | sin->sin6_flowinfo = 0; | |
414 | sin->sin6_scope_id = 0; | |
415 | if (peer) { | |
416 | if (!inet->dport) | |
417 | return -ENOTCONN; | |
418 | if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && | |
419 | peer == 1) | |
420 | return -ENOTCONN; | |
421 | sin->sin6_port = inet->dport; | |
422 | ipv6_addr_copy(&sin->sin6_addr, &np->daddr); | |
423 | if (np->sndflow) | |
424 | sin->sin6_flowinfo = np->flow_label; | |
425 | } else { | |
426 | if (ipv6_addr_any(&np->rcv_saddr)) | |
427 | ipv6_addr_copy(&sin->sin6_addr, &np->saddr); | |
428 | else | |
429 | ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); | |
430 | ||
431 | sin->sin6_port = inet->sport; | |
432 | } | |
433 | if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
434 | sin->sin6_scope_id = sk->sk_bound_dev_if; | |
435 | *uaddr_len = sizeof(*sin); | |
436 | return(0); | |
437 | } | |
438 | ||
7159039a YH |
439 | EXPORT_SYMBOL(inet6_getname); |
440 | ||
1da177e4 LT |
441 | int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
442 | { | |
443 | struct sock *sk = sock->sk; | |
1da177e4 | 444 | |
1ab1457c | 445 | switch(cmd) |
1da177e4 LT |
446 | { |
447 | case SIOCGSTAMP: | |
448 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
449 | ||
ae40eb1e ED |
450 | case SIOCGSTAMPNS: |
451 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
452 | ||
1da177e4 LT |
453 | case SIOCADDRT: |
454 | case SIOCDELRT: | |
1ab1457c | 455 | |
1da177e4 LT |
456 | return(ipv6_route_ioctl(cmd,(void __user *)arg)); |
457 | ||
458 | case SIOCSIFADDR: | |
459 | return addrconf_add_ifaddr((void __user *) arg); | |
460 | case SIOCDIFADDR: | |
461 | return addrconf_del_ifaddr((void __user *) arg); | |
462 | case SIOCSIFDSTADDR: | |
463 | return addrconf_set_dstaddr((void __user *) arg); | |
464 | default: | |
b5e5fa5e CH |
465 | if (!sk->sk_prot->ioctl) |
466 | return -ENOIOCTLCMD; | |
467 | return sk->sk_prot->ioctl(sk, cmd, arg); | |
1da177e4 LT |
468 | } |
469 | /*NOTREACHED*/ | |
470 | return(0); | |
471 | } | |
472 | ||
7159039a YH |
473 | EXPORT_SYMBOL(inet6_ioctl); |
474 | ||
90ddc4f0 | 475 | const struct proto_ops inet6_stream_ops = { |
543d9cfe ACM |
476 | .family = PF_INET6, |
477 | .owner = THIS_MODULE, | |
478 | .release = inet6_release, | |
479 | .bind = inet6_bind, | |
480 | .connect = inet_stream_connect, /* ok */ | |
481 | .socketpair = sock_no_socketpair, /* a do nothing */ | |
482 | .accept = inet_accept, /* ok */ | |
483 | .getname = inet6_getname, | |
484 | .poll = tcp_poll, /* ok */ | |
485 | .ioctl = inet6_ioctl, /* must change */ | |
486 | .listen = inet_listen, /* ok */ | |
487 | .shutdown = inet_shutdown, /* ok */ | |
488 | .setsockopt = sock_common_setsockopt, /* ok */ | |
489 | .getsockopt = sock_common_getsockopt, /* ok */ | |
490 | .sendmsg = inet_sendmsg, /* ok */ | |
491 | .recvmsg = sock_common_recvmsg, /* ok */ | |
492 | .mmap = sock_no_mmap, | |
493 | .sendpage = tcp_sendpage, | |
3fdadf7d | 494 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
495 | .compat_setsockopt = compat_sock_common_setsockopt, |
496 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 497 | #endif |
1da177e4 LT |
498 | }; |
499 | ||
90ddc4f0 | 500 | const struct proto_ops inet6_dgram_ops = { |
543d9cfe ACM |
501 | .family = PF_INET6, |
502 | .owner = THIS_MODULE, | |
503 | .release = inet6_release, | |
504 | .bind = inet6_bind, | |
505 | .connect = inet_dgram_connect, /* ok */ | |
506 | .socketpair = sock_no_socketpair, /* a do nothing */ | |
507 | .accept = sock_no_accept, /* a do nothing */ | |
508 | .getname = inet6_getname, | |
509 | .poll = udp_poll, /* ok */ | |
510 | .ioctl = inet6_ioctl, /* must change */ | |
511 | .listen = sock_no_listen, /* ok */ | |
512 | .shutdown = inet_shutdown, /* ok */ | |
513 | .setsockopt = sock_common_setsockopt, /* ok */ | |
514 | .getsockopt = sock_common_getsockopt, /* ok */ | |
515 | .sendmsg = inet_sendmsg, /* ok */ | |
516 | .recvmsg = sock_common_recvmsg, /* ok */ | |
517 | .mmap = sock_no_mmap, | |
518 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 519 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
520 | .compat_setsockopt = compat_sock_common_setsockopt, |
521 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 522 | #endif |
1da177e4 LT |
523 | }; |
524 | ||
525 | static struct net_proto_family inet6_family_ops = { | |
526 | .family = PF_INET6, | |
527 | .create = inet6_create, | |
528 | .owner = THIS_MODULE, | |
529 | }; | |
530 | ||
1da177e4 | 531 | /* Same as inet6_dgram_ops, sans udp_poll. */ |
90ddc4f0 | 532 | static const struct proto_ops inet6_sockraw_ops = { |
543d9cfe ACM |
533 | .family = PF_INET6, |
534 | .owner = THIS_MODULE, | |
535 | .release = inet6_release, | |
536 | .bind = inet6_bind, | |
537 | .connect = inet_dgram_connect, /* ok */ | |
538 | .socketpair = sock_no_socketpair, /* a do nothing */ | |
539 | .accept = sock_no_accept, /* a do nothing */ | |
540 | .getname = inet6_getname, | |
541 | .poll = datagram_poll, /* ok */ | |
542 | .ioctl = inet6_ioctl, /* must change */ | |
543 | .listen = sock_no_listen, /* ok */ | |
544 | .shutdown = inet_shutdown, /* ok */ | |
545 | .setsockopt = sock_common_setsockopt, /* ok */ | |
546 | .getsockopt = sock_common_getsockopt, /* ok */ | |
547 | .sendmsg = inet_sendmsg, /* ok */ | |
548 | .recvmsg = sock_common_recvmsg, /* ok */ | |
549 | .mmap = sock_no_mmap, | |
550 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 551 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
552 | .compat_setsockopt = compat_sock_common_setsockopt, |
553 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 554 | #endif |
1da177e4 LT |
555 | }; |
556 | ||
557 | static struct inet_protosw rawv6_protosw = { | |
558 | .type = SOCK_RAW, | |
559 | .protocol = IPPROTO_IP, /* wild card */ | |
560 | .prot = &rawv6_prot, | |
561 | .ops = &inet6_sockraw_ops, | |
562 | .capability = CAP_NET_RAW, | |
563 | .no_check = UDP_CSUM_DEFAULT, | |
564 | .flags = INET_PROTOSW_REUSE, | |
565 | }; | |
566 | ||
567 | void | |
568 | inet6_register_protosw(struct inet_protosw *p) | |
569 | { | |
570 | struct list_head *lh; | |
571 | struct inet_protosw *answer; | |
572 | int protocol = p->protocol; | |
573 | struct list_head *last_perm; | |
574 | ||
575 | spin_lock_bh(&inetsw6_lock); | |
576 | ||
577 | if (p->type >= SOCK_MAX) | |
578 | goto out_illegal; | |
579 | ||
580 | /* If we are trying to override a permanent protocol, bail. */ | |
581 | answer = NULL; | |
582 | last_perm = &inetsw6[p->type]; | |
583 | list_for_each(lh, &inetsw6[p->type]) { | |
584 | answer = list_entry(lh, struct inet_protosw, list); | |
585 | ||
586 | /* Check only the non-wild match. */ | |
587 | if (INET_PROTOSW_PERMANENT & answer->flags) { | |
588 | if (protocol == answer->protocol) | |
589 | break; | |
590 | last_perm = lh; | |
591 | } | |
592 | ||
593 | answer = NULL; | |
594 | } | |
595 | if (answer) | |
596 | goto out_permanent; | |
597 | ||
598 | /* Add the new entry after the last permanent entry if any, so that | |
599 | * the new entry does not override a permanent entry when matched with | |
600 | * a wild-card protocol. But it is allowed to override any existing | |
1ab1457c | 601 | * non-permanent entry. This means that when we remove this entry, the |
1da177e4 LT |
602 | * system automatically returns to the old behavior. |
603 | */ | |
604 | list_add_rcu(&p->list, last_perm); | |
605 | out: | |
606 | spin_unlock_bh(&inetsw6_lock); | |
607 | return; | |
608 | ||
609 | out_permanent: | |
610 | printk(KERN_ERR "Attempt to override permanent protocol %d.\n", | |
611 | protocol); | |
612 | goto out; | |
613 | ||
614 | out_illegal: | |
615 | printk(KERN_ERR | |
616 | "Ignoring attempt to register invalid socket type %d.\n", | |
617 | p->type); | |
618 | goto out; | |
619 | } | |
620 | ||
7159039a YH |
621 | EXPORT_SYMBOL(inet6_register_protosw); |
622 | ||
1da177e4 LT |
623 | void |
624 | inet6_unregister_protosw(struct inet_protosw *p) | |
625 | { | |
626 | if (INET_PROTOSW_PERMANENT & p->flags) { | |
627 | printk(KERN_ERR | |
628 | "Attempt to unregister permanent protocol %d.\n", | |
629 | p->protocol); | |
630 | } else { | |
631 | spin_lock_bh(&inetsw6_lock); | |
632 | list_del_rcu(&p->list); | |
633 | spin_unlock_bh(&inetsw6_lock); | |
634 | ||
635 | synchronize_net(); | |
636 | } | |
637 | } | |
638 | ||
7159039a YH |
639 | EXPORT_SYMBOL(inet6_unregister_protosw); |
640 | ||
b9750ce1 ACM |
641 | int inet6_sk_rebuild_header(struct sock *sk) |
642 | { | |
643 | int err; | |
644 | struct dst_entry *dst; | |
645 | struct ipv6_pinfo *np = inet6_sk(sk); | |
646 | ||
647 | dst = __sk_dst_check(sk, np->dst_cookie); | |
648 | ||
649 | if (dst == NULL) { | |
650 | struct inet_sock *inet = inet_sk(sk); | |
651 | struct in6_addr *final_p = NULL, final; | |
652 | struct flowi fl; | |
653 | ||
654 | memset(&fl, 0, sizeof(fl)); | |
655 | fl.proto = sk->sk_protocol; | |
656 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
657 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
658 | fl.fl6_flowlabel = np->flow_label; | |
659 | fl.oif = sk->sk_bound_dev_if; | |
660 | fl.fl_ip_dport = inet->dport; | |
661 | fl.fl_ip_sport = inet->sport; | |
beb8d13b | 662 | security_sk_classify_flow(sk, &fl); |
b9750ce1 ACM |
663 | |
664 | if (np->opt && np->opt->srcrt) { | |
665 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; | |
666 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
667 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
668 | final_p = &final; | |
669 | } | |
670 | ||
671 | err = ip6_dst_lookup(sk, &dst, &fl); | |
672 | if (err) { | |
673 | sk->sk_route_caps = 0; | |
674 | return err; | |
675 | } | |
676 | if (final_p) | |
677 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
678 | ||
679 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
680 | sk->sk_err_soft = -err; | |
681 | return err; | |
682 | } | |
683 | ||
8e1ef0a9 | 684 | __ip6_dst_store(sk, dst, NULL, NULL); |
b9750ce1 ACM |
685 | } |
686 | ||
687 | return 0; | |
688 | } | |
689 | ||
690 | EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); | |
691 | ||
399c07de ACM |
692 | int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) |
693 | { | |
694 | struct ipv6_pinfo *np = inet6_sk(sk); | |
695 | struct inet6_skb_parm *opt = IP6CB(skb); | |
696 | ||
697 | if (np->rxopt.all) { | |
698 | if ((opt->hop && (np->rxopt.bits.hopopts || | |
699 | np->rxopt.bits.ohopopts)) || | |
d56f90a7 ACM |
700 | ((IPV6_FLOWINFO_MASK & |
701 | *(__be32 *)skb_network_header(skb)) && | |
399c07de ACM |
702 | np->rxopt.bits.rxflow) || |
703 | (opt->srcrt && (np->rxopt.bits.srcrt || | |
704 | np->rxopt.bits.osrcrt)) || | |
705 | ((opt->dst1 || opt->dst0) && | |
706 | (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) | |
707 | return 1; | |
708 | } | |
709 | return 0; | |
710 | } | |
711 | ||
712 | EXPORT_SYMBOL_GPL(ipv6_opt_accepted); | |
713 | ||
1da177e4 LT |
714 | static int __init init_ipv6_mibs(void) |
715 | { | |
7f7d9a6b HX |
716 | if (snmp_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib), |
717 | __alignof__(struct ipstats_mib)) < 0) | |
1da177e4 | 718 | goto err_ip_mib; |
7f7d9a6b HX |
719 | if (snmp_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib), |
720 | __alignof__(struct icmpv6_mib)) < 0) | |
1da177e4 | 721 | goto err_icmp_mib; |
7f7d9a6b HX |
722 | if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib), |
723 | __alignof__(struct udp_mib)) < 0) | |
1da177e4 | 724 | goto err_udp_mib; |
7f7d9a6b HX |
725 | if (snmp_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib), |
726 | __alignof__(struct udp_mib)) < 0) | |
ba4e58ec | 727 | goto err_udplite_mib; |
1da177e4 LT |
728 | return 0; |
729 | ||
ba4e58ec | 730 | err_udplite_mib: |
7f7d9a6b | 731 | snmp_mib_free((void **)udp_stats_in6); |
1da177e4 | 732 | err_udp_mib: |
7f7d9a6b | 733 | snmp_mib_free((void **)icmpv6_statistics); |
1da177e4 | 734 | err_icmp_mib: |
7f7d9a6b | 735 | snmp_mib_free((void **)ipv6_statistics); |
1da177e4 LT |
736 | err_ip_mib: |
737 | return -ENOMEM; | |
1ab1457c | 738 | |
1da177e4 LT |
739 | } |
740 | ||
741 | static void cleanup_ipv6_mibs(void) | |
742 | { | |
7f7d9a6b HX |
743 | snmp_mib_free((void **)ipv6_statistics); |
744 | snmp_mib_free((void **)icmpv6_statistics); | |
745 | snmp_mib_free((void **)udp_stats_in6); | |
746 | snmp_mib_free((void **)udplite_stats_in6); | |
1da177e4 LT |
747 | } |
748 | ||
1da177e4 LT |
749 | static int __init inet6_init(void) |
750 | { | |
751 | struct sk_buff *dummy_skb; | |
1ab1457c | 752 | struct list_head *r; |
1da177e4 LT |
753 | int err; |
754 | ||
ef047f5e YH |
755 | BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); |
756 | ||
1da177e4 LT |
757 | #ifdef MODULE |
758 | #if 0 /* FIXME --RR */ | |
759 | if (!mod_member_present(&__this_module, can_unload)) | |
760 | return -EINVAL; | |
761 | ||
762 | __this_module.can_unload = &ipv6_unload; | |
763 | #endif | |
764 | #endif | |
765 | ||
1da177e4 LT |
766 | err = proto_register(&tcpv6_prot, 1); |
767 | if (err) | |
768 | goto out; | |
769 | ||
770 | err = proto_register(&udpv6_prot, 1); | |
771 | if (err) | |
772 | goto out_unregister_tcp_proto; | |
773 | ||
ba4e58ec | 774 | err = proto_register(&udplitev6_prot, 1); |
1da177e4 LT |
775 | if (err) |
776 | goto out_unregister_udp_proto; | |
777 | ||
ba4e58ec GR |
778 | err = proto_register(&rawv6_prot, 1); |
779 | if (err) | |
780 | goto out_unregister_udplite_proto; | |
781 | ||
1da177e4 LT |
782 | |
783 | /* Register the socket-side information for inet6_create. */ | |
784 | for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) | |
785 | INIT_LIST_HEAD(r); | |
786 | ||
787 | /* We MUST register RAW sockets before we create the ICMP6, | |
788 | * IGMP6, or NDISC control sockets. | |
789 | */ | |
790 | inet6_register_protosw(&rawv6_protosw); | |
791 | ||
792 | /* Register the family here so that the init calls below will | |
793 | * be able to create sockets. (?? is this dangerous ??) | |
794 | */ | |
8eb55910 DM |
795 | err = sock_register(&inet6_family_ops); |
796 | if (err) | |
797 | goto out_unregister_raw_proto; | |
1da177e4 LT |
798 | |
799 | /* Initialise ipv6 mibs */ | |
800 | err = init_ipv6_mibs(); | |
801 | if (err) | |
8eb55910 | 802 | goto out_unregister_sock; |
1ab1457c | 803 | |
1da177e4 LT |
804 | /* |
805 | * ipngwg API draft makes clear that the correct semantics | |
806 | * for TCP and UDP is to consider one TCP and UDP instance | |
807 | * in a host availiable by both INET and INET6 APIs and | |
808 | * able to communicate via both network protocols. | |
809 | */ | |
810 | ||
811 | #ifdef CONFIG_SYSCTL | |
812 | ipv6_sysctl_register(); | |
813 | #endif | |
814 | err = icmpv6_init(&inet6_family_ops); | |
815 | if (err) | |
816 | goto icmp_fail; | |
817 | err = ndisc_init(&inet6_family_ops); | |
818 | if (err) | |
819 | goto ndisc_fail; | |
820 | err = igmp6_init(&inet6_family_ops); | |
821 | if (err) | |
822 | goto igmp_fail; | |
2cc7d573 HW |
823 | err = ipv6_netfilter_init(); |
824 | if (err) | |
825 | goto netfilter_fail; | |
1da177e4 LT |
826 | /* Create /proc/foo6 entries. */ |
827 | #ifdef CONFIG_PROC_FS | |
828 | err = -ENOMEM; | |
829 | if (raw6_proc_init()) | |
830 | goto proc_raw6_fail; | |
831 | if (tcp6_proc_init()) | |
832 | goto proc_tcp6_fail; | |
833 | if (udp6_proc_init()) | |
834 | goto proc_udp6_fail; | |
ba4e58ec GR |
835 | if (udplite6_proc_init()) |
836 | goto proc_udplite6_fail; | |
1da177e4 LT |
837 | if (ipv6_misc_proc_init()) |
838 | goto proc_misc6_fail; | |
839 | ||
840 | if (ac6_proc_init()) | |
841 | goto proc_anycast6_fail; | |
842 | if (if6_proc_init()) | |
843 | goto proc_if6_fail; | |
844 | #endif | |
1da177e4 LT |
845 | ip6_route_init(); |
846 | ip6_flowlabel_init(); | |
847 | err = addrconf_init(); | |
848 | if (err) | |
849 | goto addrconf_fail; | |
1da177e4 LT |
850 | |
851 | /* Init v6 extension headers. */ | |
852 | ipv6_rthdr_init(); | |
853 | ipv6_frag_init(); | |
854 | ipv6_nodata_init(); | |
855 | ipv6_destopt_init(); | |
2c8d7ca0 NT |
856 | #ifdef CONFIG_IPV6_MIP6 |
857 | mip6_init(); | |
858 | #endif | |
1da177e4 LT |
859 | |
860 | /* Init v6 transport protocols. */ | |
861 | udpv6_init(); | |
ba4e58ec | 862 | udplitev6_init(); |
1da177e4 | 863 | tcpv6_init(); |
e2ed4052 HX |
864 | |
865 | ipv6_packet_init(); | |
1da177e4 LT |
866 | err = 0; |
867 | out: | |
868 | return err; | |
869 | ||
870 | addrconf_fail: | |
871 | ip6_flowlabel_cleanup(); | |
872 | ip6_route_cleanup(); | |
1da177e4 LT |
873 | #ifdef CONFIG_PROC_FS |
874 | if6_proc_exit(); | |
875 | proc_if6_fail: | |
876 | ac6_proc_exit(); | |
877 | proc_anycast6_fail: | |
878 | ipv6_misc_proc_exit(); | |
879 | proc_misc6_fail: | |
ba4e58ec GR |
880 | udplite6_proc_exit(); |
881 | proc_udplite6_fail: | |
1da177e4 LT |
882 | udp6_proc_exit(); |
883 | proc_udp6_fail: | |
884 | tcp6_proc_exit(); | |
885 | proc_tcp6_fail: | |
886 | raw6_proc_exit(); | |
887 | proc_raw6_fail: | |
888 | #endif | |
2cc7d573 HW |
889 | ipv6_netfilter_fini(); |
890 | netfilter_fail: | |
1da177e4 LT |
891 | igmp6_cleanup(); |
892 | igmp_fail: | |
893 | ndisc_cleanup(); | |
894 | ndisc_fail: | |
895 | icmpv6_cleanup(); | |
896 | icmp_fail: | |
897 | #ifdef CONFIG_SYSCTL | |
898 | ipv6_sysctl_unregister(); | |
899 | #endif | |
900 | cleanup_ipv6_mibs(); | |
8eb55910 DM |
901 | out_unregister_sock: |
902 | sock_unregister(PF_INET6); | |
1da177e4 LT |
903 | out_unregister_raw_proto: |
904 | proto_unregister(&rawv6_prot); | |
ba4e58ec GR |
905 | out_unregister_udplite_proto: |
906 | proto_unregister(&udplitev6_prot); | |
1da177e4 LT |
907 | out_unregister_udp_proto: |
908 | proto_unregister(&udpv6_prot); | |
909 | out_unregister_tcp_proto: | |
910 | proto_unregister(&tcpv6_prot); | |
911 | goto out; | |
912 | } | |
913 | module_init(inet6_init); | |
914 | ||
915 | static void __exit inet6_exit(void) | |
916 | { | |
917 | /* First of all disallow new sockets creation. */ | |
918 | sock_unregister(PF_INET6); | |
c127ea2c TG |
919 | /* Disallow any further netlink messages */ |
920 | rtnl_unregister_all(PF_INET6); | |
ca17c233 JJ |
921 | |
922 | /* Cleanup code parts. */ | |
923 | ipv6_packet_cleanup(); | |
924 | #ifdef CONFIG_IPV6_MIP6 | |
925 | mip6_fini(); | |
926 | #endif | |
927 | addrconf_cleanup(); | |
928 | ip6_flowlabel_cleanup(); | |
929 | ip6_route_cleanup(); | |
1da177e4 | 930 | #ifdef CONFIG_PROC_FS |
ca17c233 JJ |
931 | |
932 | /* Cleanup code parts. */ | |
1da177e4 LT |
933 | if6_proc_exit(); |
934 | ac6_proc_exit(); | |
1ab1457c | 935 | ipv6_misc_proc_exit(); |
1ab1457c | 936 | udplite6_proc_exit(); |
ca17c233 | 937 | udp6_proc_exit(); |
1ab1457c YH |
938 | tcp6_proc_exit(); |
939 | raw6_proc_exit(); | |
2c8d7ca0 | 940 | #endif |
2cc7d573 | 941 | ipv6_netfilter_fini(); |
ca17c233 | 942 | igmp6_cleanup(); |
1da177e4 LT |
943 | ndisc_cleanup(); |
944 | icmpv6_cleanup(); | |
945 | #ifdef CONFIG_SYSCTL | |
1ab1457c | 946 | ipv6_sysctl_unregister(); |
1da177e4 LT |
947 | #endif |
948 | cleanup_ipv6_mibs(); | |
949 | proto_unregister(&rawv6_prot); | |
ca17c233 | 950 | proto_unregister(&udplitev6_prot); |
1da177e4 LT |
951 | proto_unregister(&udpv6_prot); |
952 | proto_unregister(&tcpv6_prot); | |
953 | } | |
954 | module_exit(inet6_exit); | |
955 | ||
956 | MODULE_ALIAS_NETPROTO(PF_INET6); |