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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999-2000 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * Copyright (c) 2001 Intel Corp. | |
6 | * Copyright (c) 2001 Nokia, Inc. | |
7 | * Copyright (c) 2001 La Monte H.P. Yarroll | |
8 | * | |
60c778b2 | 9 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
10 | * |
11 | * Initialization/cleanup for SCTP protocol support. | |
12 | * | |
60c778b2 | 13 | * This SCTP implementation is free software; |
1da177e4 LT |
14 | * you can redistribute it and/or modify it under the terms of |
15 | * the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2, or (at your option) | |
17 | * any later version. | |
18 | * | |
60c778b2 | 19 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
20 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
21 | * ************************ | |
22 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
23 | * See the GNU General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
26 | * along with GNU CC; see the file COPYING. If not, write to | |
27 | * the Free Software Foundation, 59 Temple Place - Suite 330, | |
28 | * Boston, MA 02111-1307, USA. | |
29 | * | |
30 | * Please send any bug reports or fixes you make to the | |
31 | * email address(es): | |
32 | * lksctp developers <lksctp-developers@lists.sourceforge.net> | |
33 | * | |
34 | * Or submit a bug report through the following website: | |
35 | * http://www.sf.net/projects/lksctp | |
36 | * | |
37 | * Written or modified by: | |
38 | * La Monte H.P. Yarroll <piggy@acm.org> | |
39 | * Karl Knutson <karl@athena.chicago.il.us> | |
40 | * Jon Grimm <jgrimm@us.ibm.com> | |
41 | * Sridhar Samudrala <sri@us.ibm.com> | |
42 | * Daisy Chang <daisyc@us.ibm.com> | |
43 | * Ardelle Fan <ardelle.fan@intel.com> | |
44 | * | |
45 | * Any bugs reported given to us we will try to fix... any fixes shared will | |
46 | * be incorporated into the next SCTP release. | |
47 | */ | |
48 | ||
145ce502 JP |
49 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
50 | ||
1da177e4 LT |
51 | #include <linux/module.h> |
52 | #include <linux/init.h> | |
53 | #include <linux/netdevice.h> | |
54 | #include <linux/inetdevice.h> | |
55 | #include <linux/seq_file.h> | |
4d93df0a | 56 | #include <linux/bootmem.h> |
845525a6 VY |
57 | #include <linux/highmem.h> |
58 | #include <linux/swap.h> | |
5a0e3ad6 | 59 | #include <linux/slab.h> |
457c4cbc | 60 | #include <net/net_namespace.h> |
1da177e4 LT |
61 | #include <net/protocol.h> |
62 | #include <net/ip.h> | |
63 | #include <net/ipv6.h> | |
14c85021 | 64 | #include <net/route.h> |
1da177e4 LT |
65 | #include <net/sctp/sctp.h> |
66 | #include <net/addrconf.h> | |
67 | #include <net/inet_common.h> | |
68 | #include <net/inet_ecn.h> | |
69 | ||
70 | /* Global data structures. */ | |
4cbf1cae | 71 | struct sctp_globals sctp_globals __read_mostly; |
ba89966c | 72 | DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; |
1da177e4 LT |
73 | |
74 | struct idr sctp_assocs_id; | |
75 | DEFINE_SPINLOCK(sctp_assocs_id_lock); | |
76 | ||
1da177e4 LT |
77 | static struct sctp_pf *sctp_pf_inet6_specific; |
78 | static struct sctp_pf *sctp_pf_inet_specific; | |
79 | static struct sctp_af *sctp_af_v4_specific; | |
80 | static struct sctp_af *sctp_af_v6_specific; | |
81 | ||
e18b890b CL |
82 | struct kmem_cache *sctp_chunk_cachep __read_mostly; |
83 | struct kmem_cache *sctp_bucket_cachep __read_mostly; | |
1da177e4 | 84 | |
8d987e5c | 85 | long sysctl_sctp_mem[3]; |
007e3936 VY |
86 | int sysctl_sctp_rmem[3]; |
87 | int sysctl_sctp_wmem[3]; | |
4d93df0a | 88 | |
1da177e4 | 89 | /* Set up the proc fs entry for the SCTP protocol. */ |
13d782f6 | 90 | static __net_init int sctp_proc_init(struct net *net) |
1da177e4 | 91 | { |
c4e85f82 | 92 | #ifdef CONFIG_PROC_FS |
13d782f6 EB |
93 | net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net); |
94 | if (!net->sctp.proc_net_sctp) | |
95 | goto out_proc_net_sctp; | |
96 | if (sctp_snmp_proc_init(net)) | |
80896a35 | 97 | goto out_snmp_proc_init; |
13d782f6 | 98 | if (sctp_eps_proc_init(net)) |
80896a35 | 99 | goto out_eps_proc_init; |
13d782f6 | 100 | if (sctp_assocs_proc_init(net)) |
80896a35 | 101 | goto out_assocs_proc_init; |
13d782f6 | 102 | if (sctp_remaddr_proc_init(net)) |
caea902f | 103 | goto out_remaddr_proc_init; |
1da177e4 LT |
104 | |
105 | return 0; | |
106 | ||
caea902f | 107 | out_remaddr_proc_init: |
13d782f6 | 108 | sctp_assocs_proc_exit(net); |
80896a35 | 109 | out_assocs_proc_init: |
13d782f6 | 110 | sctp_eps_proc_exit(net); |
80896a35 | 111 | out_eps_proc_init: |
13d782f6 | 112 | sctp_snmp_proc_exit(net); |
80896a35 | 113 | out_snmp_proc_init: |
13d782f6 EB |
114 | remove_proc_entry("sctp", net->proc_net); |
115 | net->sctp.proc_net_sctp = NULL; | |
116 | out_proc_net_sctp: | |
157653ce | 117 | return -ENOMEM; |
13d782f6 EB |
118 | #endif /* CONFIG_PROC_FS */ |
119 | return 0; | |
1da177e4 LT |
120 | } |
121 | ||
d808ad9a | 122 | /* Clean up the proc fs entry for the SCTP protocol. |
1da177e4 LT |
123 | * Note: Do not make this __exit as it is used in the init error |
124 | * path. | |
125 | */ | |
13d782f6 | 126 | static void sctp_proc_exit(struct net *net) |
1da177e4 | 127 | { |
c4e85f82 | 128 | #ifdef CONFIG_PROC_FS |
13d782f6 EB |
129 | sctp_snmp_proc_exit(net); |
130 | sctp_eps_proc_exit(net); | |
131 | sctp_assocs_proc_exit(net); | |
132 | sctp_remaddr_proc_exit(net); | |
133 | ||
134 | remove_proc_entry("sctp", net->proc_net); | |
135 | net->sctp.proc_net_sctp = NULL; | |
c4e85f82 | 136 | #endif |
1da177e4 LT |
137 | } |
138 | ||
139 | /* Private helper to extract ipv4 address and stash them in | |
140 | * the protocol structure. | |
141 | */ | |
142 | static void sctp_v4_copy_addrlist(struct list_head *addrlist, | |
143 | struct net_device *dev) | |
144 | { | |
145 | struct in_device *in_dev; | |
146 | struct in_ifaddr *ifa; | |
147 | struct sctp_sockaddr_entry *addr; | |
148 | ||
149 | rcu_read_lock(); | |
e5ed6399 | 150 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { |
1da177e4 LT |
151 | rcu_read_unlock(); |
152 | return; | |
153 | } | |
154 | ||
155 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { | |
156 | /* Add the address to the local list. */ | |
157 | addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); | |
158 | if (addr) { | |
2a6fd78a AV |
159 | addr->a.v4.sin_family = AF_INET; |
160 | addr->a.v4.sin_port = 0; | |
161 | addr->a.v4.sin_addr.s_addr = ifa->ifa_local; | |
29303547 VY |
162 | addr->valid = 1; |
163 | INIT_LIST_HEAD(&addr->list); | |
1da177e4 LT |
164 | list_add_tail(&addr->list, addrlist); |
165 | } | |
166 | } | |
167 | ||
168 | rcu_read_unlock(); | |
169 | } | |
170 | ||
171 | /* Extract our IP addresses from the system and stash them in the | |
172 | * protocol structure. | |
173 | */ | |
4db67e80 | 174 | static void sctp_get_local_addr_list(struct net *net) |
1da177e4 LT |
175 | { |
176 | struct net_device *dev; | |
177 | struct list_head *pos; | |
178 | struct sctp_af *af; | |
179 | ||
c6d14c84 | 180 | rcu_read_lock(); |
4db67e80 | 181 | for_each_netdev_rcu(net, dev) { |
1da177e4 LT |
182 | __list_for_each(pos, &sctp_address_families) { |
183 | af = list_entry(pos, struct sctp_af, list); | |
4db67e80 | 184 | af->copy_addrlist(&net->sctp.local_addr_list, dev); |
1da177e4 LT |
185 | } |
186 | } | |
c6d14c84 | 187 | rcu_read_unlock(); |
1da177e4 LT |
188 | } |
189 | ||
1da177e4 | 190 | /* Free the existing local addresses. */ |
4db67e80 | 191 | static void sctp_free_local_addr_list(struct net *net) |
1da177e4 LT |
192 | { |
193 | struct sctp_sockaddr_entry *addr; | |
194 | struct list_head *pos, *temp; | |
195 | ||
4db67e80 | 196 | list_for_each_safe(pos, temp, &net->sctp.local_addr_list) { |
1da177e4 LT |
197 | addr = list_entry(pos, struct sctp_sockaddr_entry, list); |
198 | list_del(pos); | |
199 | kfree(addr); | |
200 | } | |
201 | } | |
202 | ||
1da177e4 | 203 | /* Copy the local addresses which are valid for 'scope' into 'bp'. */ |
4db67e80 EB |
204 | int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp, |
205 | sctp_scope_t scope, gfp_t gfp, int copy_flags) | |
1da177e4 LT |
206 | { |
207 | struct sctp_sockaddr_entry *addr; | |
208 | int error = 0; | |
1da177e4 | 209 | |
29303547 | 210 | rcu_read_lock(); |
4db67e80 | 211 | list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) { |
29303547 VY |
212 | if (!addr->valid) |
213 | continue; | |
6244be4e | 214 | if (sctp_in_scope(&addr->a, scope)) { |
1da177e4 LT |
215 | /* Now that the address is in scope, check to see if |
216 | * the address type is really supported by the local | |
217 | * sock as well as the remote peer. | |
218 | */ | |
6244be4e | 219 | if ((((AF_INET == addr->a.sa.sa_family) && |
1da177e4 | 220 | (copy_flags & SCTP_ADDR4_PEERSUPP))) || |
6244be4e | 221 | (((AF_INET6 == addr->a.sa.sa_family) && |
1da177e4 LT |
222 | (copy_flags & SCTP_ADDR6_ALLOWED) && |
223 | (copy_flags & SCTP_ADDR6_PEERSUPP)))) { | |
f57d96b2 VY |
224 | error = sctp_add_bind_addr(bp, &addr->a, |
225 | SCTP_ADDR_SRC, GFP_ATOMIC); | |
1da177e4 LT |
226 | if (error) |
227 | goto end_copy; | |
228 | } | |
229 | } | |
230 | } | |
231 | ||
232 | end_copy: | |
29303547 | 233 | rcu_read_unlock(); |
1da177e4 LT |
234 | return error; |
235 | } | |
236 | ||
237 | /* Initialize a sctp_addr from in incoming skb. */ | |
238 | static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, | |
239 | int is_saddr) | |
240 | { | |
241 | void *from; | |
d55c41b1 | 242 | __be16 *port; |
1da177e4 LT |
243 | struct sctphdr *sh; |
244 | ||
245 | port = &addr->v4.sin_port; | |
246 | addr->v4.sin_family = AF_INET; | |
247 | ||
2c0fd387 | 248 | sh = sctp_hdr(skb); |
1da177e4 | 249 | if (is_saddr) { |
d55c41b1 | 250 | *port = sh->source; |
eddc9ec5 | 251 | from = &ip_hdr(skb)->saddr; |
1da177e4 | 252 | } else { |
d55c41b1 | 253 | *port = sh->dest; |
eddc9ec5 | 254 | from = &ip_hdr(skb)->daddr; |
1da177e4 LT |
255 | } |
256 | memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); | |
257 | } | |
258 | ||
259 | /* Initialize an sctp_addr from a socket. */ | |
260 | static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) | |
261 | { | |
262 | addr->v4.sin_family = AF_INET; | |
7dcdbd95 | 263 | addr->v4.sin_port = 0; |
c720c7e8 | 264 | addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr; |
1da177e4 LT |
265 | } |
266 | ||
267 | /* Initialize sk->sk_rcv_saddr from sctp_addr. */ | |
268 | static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) | |
269 | { | |
c720c7e8 | 270 | inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr; |
1da177e4 LT |
271 | } |
272 | ||
273 | /* Initialize sk->sk_daddr from sctp_addr. */ | |
274 | static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) | |
275 | { | |
c720c7e8 | 276 | inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr; |
1da177e4 LT |
277 | } |
278 | ||
279 | /* Initialize a sctp_addr from an address parameter. */ | |
280 | static void sctp_v4_from_addr_param(union sctp_addr *addr, | |
281 | union sctp_addr_param *param, | |
dd86d136 | 282 | __be16 port, int iif) |
1da177e4 LT |
283 | { |
284 | addr->v4.sin_family = AF_INET; | |
285 | addr->v4.sin_port = port; | |
286 | addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; | |
287 | } | |
288 | ||
289 | /* Initialize an address parameter from a sctp_addr and return the length | |
290 | * of the address parameter. | |
291 | */ | |
292 | static int sctp_v4_to_addr_param(const union sctp_addr *addr, | |
293 | union sctp_addr_param *param) | |
294 | { | |
295 | int length = sizeof(sctp_ipv4addr_param_t); | |
296 | ||
297 | param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; | |
dbc16db1 | 298 | param->v4.param_hdr.length = htons(length); |
d808ad9a | 299 | param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; |
1da177e4 LT |
300 | |
301 | return length; | |
302 | } | |
303 | ||
304 | /* Initialize a sctp_addr from a dst_entry. */ | |
18a353f4 | 305 | static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4, |
854d43a4 | 306 | __be16 port) |
1da177e4 | 307 | { |
1da177e4 LT |
308 | saddr->v4.sin_family = AF_INET; |
309 | saddr->v4.sin_port = port; | |
18a353f4 | 310 | saddr->v4.sin_addr.s_addr = fl4->saddr; |
1da177e4 LT |
311 | } |
312 | ||
313 | /* Compare two addresses exactly. */ | |
314 | static int sctp_v4_cmp_addr(const union sctp_addr *addr1, | |
315 | const union sctp_addr *addr2) | |
316 | { | |
317 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
318 | return 0; | |
319 | if (addr1->v4.sin_port != addr2->v4.sin_port) | |
320 | return 0; | |
321 | if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) | |
322 | return 0; | |
323 | ||
324 | return 1; | |
325 | } | |
326 | ||
327 | /* Initialize addr struct to INADDR_ANY. */ | |
6fbfa9f9 | 328 | static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) |
1da177e4 LT |
329 | { |
330 | addr->v4.sin_family = AF_INET; | |
e6f1cebf | 331 | addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); |
1da177e4 LT |
332 | addr->v4.sin_port = port; |
333 | } | |
334 | ||
335 | /* Is this a wildcard address? */ | |
336 | static int sctp_v4_is_any(const union sctp_addr *addr) | |
337 | { | |
e6f1cebf | 338 | return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; |
1da177e4 LT |
339 | } |
340 | ||
341 | /* This function checks if the address is a valid address to be used for | |
342 | * SCTP binding. | |
343 | * | |
344 | * Output: | |
345 | * Return 0 - If the address is a non-unicast or an illegal address. | |
346 | * Return 1 - If the address is a unicast. | |
347 | */ | |
5636bef7 VY |
348 | static int sctp_v4_addr_valid(union sctp_addr *addr, |
349 | struct sctp_sock *sp, | |
350 | const struct sk_buff *skb) | |
1da177e4 | 351 | { |
7dab83de VY |
352 | /* IPv4 addresses not allowed */ |
353 | if (sp && ipv6_only_sock(sctp_opt2sk(sp))) | |
354 | return 0; | |
355 | ||
1da177e4 | 356 | /* Is this a non-unicast address or a unusable SCTP address? */ |
b5cb2bbc | 357 | if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) |
1da177e4 LT |
358 | return 0; |
359 | ||
d808ad9a | 360 | /* Is this a broadcast address? */ |
511c3f92 | 361 | if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST) |
d808ad9a | 362 | return 0; |
5636bef7 | 363 | |
1da177e4 LT |
364 | return 1; |
365 | } | |
366 | ||
367 | /* Should this be available for binding? */ | |
368 | static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) | |
369 | { | |
6b175b26 | 370 | int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr); |
1da177e4 | 371 | |
1da177e4 | 372 | |
e6f1cebf | 373 | if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && |
cdac4e07 NH |
374 | ret != RTN_LOCAL && |
375 | !sp->inet.freebind && | |
376 | !sysctl_ip_nonlocal_bind) | |
1da177e4 | 377 | return 0; |
cdac4e07 | 378 | |
7dab83de VY |
379 | if (ipv6_only_sock(sctp_opt2sk(sp))) |
380 | return 0; | |
381 | ||
1da177e4 LT |
382 | return 1; |
383 | } | |
384 | ||
385 | /* Checking the loopback, private and other address scopes as defined in | |
386 | * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 | |
387 | * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. | |
388 | * | |
389 | * Level 0 - unusable SCTP addresses | |
390 | * Level 1 - loopback address | |
391 | * Level 2 - link-local addresses | |
392 | * Level 3 - private addresses. | |
393 | * Level 4 - global addresses | |
394 | * For INIT and INIT-ACK address list, let L be the level of | |
395 | * of requested destination address, sender and receiver | |
396 | * SHOULD include all of its addresses with level greater | |
397 | * than or equal to L. | |
72388433 BD |
398 | * |
399 | * IPv4 scoping can be controlled through sysctl option | |
400 | * net.sctp.addr_scope_policy | |
1da177e4 LT |
401 | */ |
402 | static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) | |
403 | { | |
404 | sctp_scope_t retval; | |
405 | ||
1da177e4 | 406 | /* Check for unusable SCTP addresses. */ |
b5cb2bbc | 407 | if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { |
1da177e4 | 408 | retval = SCTP_SCOPE_UNUSABLE; |
b5cb2bbc | 409 | } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { |
1da177e4 | 410 | retval = SCTP_SCOPE_LOOPBACK; |
b5cb2bbc | 411 | } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { |
1da177e4 | 412 | retval = SCTP_SCOPE_LINK; |
b5cb2bbc JP |
413 | } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || |
414 | ipv4_is_private_172(addr->v4.sin_addr.s_addr) || | |
415 | ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { | |
1da177e4 LT |
416 | retval = SCTP_SCOPE_PRIVATE; |
417 | } else { | |
418 | retval = SCTP_SCOPE_GLOBAL; | |
419 | } | |
420 | ||
421 | return retval; | |
422 | } | |
423 | ||
424 | /* Returns a valid dst cache entry for the given source and destination ip | |
425 | * addresses. If an association is passed, trys to get a dst entry with a | |
426 | * source address that matches an address in the bind address list. | |
427 | */ | |
da0420be VY |
428 | static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr, |
429 | struct flowi *fl, struct sock *sk) | |
1da177e4 | 430 | { |
da0420be | 431 | struct sctp_association *asoc = t->asoc; |
1da177e4 | 432 | struct rtable *rt; |
9914ae3c | 433 | struct flowi4 *fl4 = &fl->u.ip4; |
1da177e4 | 434 | struct sctp_bind_addr *bp; |
1da177e4 | 435 | struct sctp_sockaddr_entry *laddr; |
1da177e4 | 436 | struct dst_entry *dst = NULL; |
da0420be | 437 | union sctp_addr *daddr = &t->ipaddr; |
1da177e4 LT |
438 | union sctp_addr dst_saddr; |
439 | ||
9914ae3c VY |
440 | memset(fl4, 0x0, sizeof(struct flowi4)); |
441 | fl4->daddr = daddr->v4.sin_addr.s_addr; | |
442 | fl4->fl4_dport = daddr->v4.sin_port; | |
443 | fl4->flowi4_proto = IPPROTO_SCTP; | |
1da177e4 | 444 | if (asoc) { |
9914ae3c VY |
445 | fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk); |
446 | fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if; | |
447 | fl4->fl4_sport = htons(asoc->base.bind_addr.port); | |
1da177e4 | 448 | } |
6429d3dc | 449 | if (saddr) { |
9914ae3c VY |
450 | fl4->saddr = saddr->v4.sin_addr.s_addr; |
451 | fl4->fl4_sport = saddr->v4.sin_port; | |
6429d3dc | 452 | } |
1da177e4 | 453 | |
21454aaa | 454 | SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ", |
9914ae3c | 455 | __func__, &fl4->daddr, &fl4->saddr); |
1da177e4 | 456 | |
9914ae3c | 457 | rt = ip_route_output_key(&init_net, fl4); |
b23dd4fe | 458 | if (!IS_ERR(rt)) |
d8d1f30b | 459 | dst = &rt->dst; |
1da177e4 LT |
460 | |
461 | /* If there is no association or if a source address is passed, no | |
462 | * more validation is required. | |
463 | */ | |
464 | if (!asoc || saddr) | |
465 | goto out; | |
466 | ||
467 | bp = &asoc->base.bind_addr; | |
1da177e4 LT |
468 | |
469 | if (dst) { | |
470 | /* Walk through the bind address list and look for a bind | |
471 | * address that matches the source address of the returned dst. | |
472 | */ | |
18a353f4 | 473 | sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port)); |
559cf710 VY |
474 | rcu_read_lock(); |
475 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
8a07eb0a MH |
476 | if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) || |
477 | (laddr->state != SCTP_ADDR_SRC && | |
478 | !asoc->src_out_of_asoc_ok)) | |
dc022a98 | 479 | continue; |
854d43a4 | 480 | if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) |
1da177e4 LT |
481 | goto out_unlock; |
482 | } | |
559cf710 | 483 | rcu_read_unlock(); |
1da177e4 LT |
484 | |
485 | /* None of the bound addresses match the source address of the | |
486 | * dst. So release it. | |
487 | */ | |
488 | dst_release(dst); | |
489 | dst = NULL; | |
490 | } | |
491 | ||
492 | /* Walk through the bind address list and try to get a dst that | |
493 | * matches a bind address as the source address. | |
494 | */ | |
559cf710 VY |
495 | rcu_read_lock(); |
496 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { | |
497 | if (!laddr->valid) | |
498 | continue; | |
f57d96b2 | 499 | if ((laddr->state == SCTP_ADDR_SRC) && |
6244be4e | 500 | (AF_INET == laddr->a.sa.sa_family)) { |
9914ae3c VY |
501 | fl4->saddr = laddr->a.v4.sin_addr.s_addr; |
502 | fl4->fl4_sport = laddr->a.v4.sin_port; | |
503 | rt = ip_route_output_key(&init_net, fl4); | |
b23dd4fe | 504 | if (!IS_ERR(rt)) { |
d8d1f30b | 505 | dst = &rt->dst; |
1da177e4 LT |
506 | goto out_unlock; |
507 | } | |
508 | } | |
509 | } | |
510 | ||
511 | out_unlock: | |
559cf710 | 512 | rcu_read_unlock(); |
1da177e4 | 513 | out: |
da0420be | 514 | t->dst = dst; |
1da177e4 | 515 | if (dst) |
21454aaa | 516 | SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n", |
18a353f4 | 517 | &fl4->daddr, &fl4->saddr); |
1da177e4 LT |
518 | else |
519 | SCTP_DEBUG_PRINTK("NO ROUTE\n"); | |
1da177e4 LT |
520 | } |
521 | ||
522 | /* For v4, the source address is cached in the route entry(dst). So no need | |
523 | * to cache it separately and hence this is an empty routine. | |
524 | */ | |
e5117101 | 525 | static void sctp_v4_get_saddr(struct sctp_sock *sk, |
9914ae3c | 526 | struct sctp_transport *t, |
9914ae3c | 527 | struct flowi *fl) |
1da177e4 | 528 | { |
9914ae3c VY |
529 | union sctp_addr *saddr = &t->saddr; |
530 | struct rtable *rt = (struct rtable *)t->dst; | |
23ec47a0 | 531 | |
1da177e4 LT |
532 | if (rt) { |
533 | saddr->v4.sin_family = AF_INET; | |
902ebd3e | 534 | saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr; |
1da177e4 LT |
535 | } |
536 | } | |
537 | ||
538 | /* What interface did this skb arrive on? */ | |
539 | static int sctp_v4_skb_iif(const struct sk_buff *skb) | |
540 | { | |
92101b3b | 541 | return inet_iif(skb); |
1da177e4 LT |
542 | } |
543 | ||
544 | /* Was this packet marked by Explicit Congestion Notification? */ | |
545 | static int sctp_v4_is_ce(const struct sk_buff *skb) | |
546 | { | |
eddc9ec5 | 547 | return INET_ECN_is_ce(ip_hdr(skb)->tos); |
1da177e4 LT |
548 | } |
549 | ||
550 | /* Create and initialize a new sk for the socket returned by accept(). */ | |
551 | static struct sock *sctp_v4_create_accept_sk(struct sock *sk, | |
552 | struct sctp_association *asoc) | |
553 | { | |
3b1e0a65 | 554 | struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, |
6257ff21 | 555 | sk->sk_prot); |
914e1c8b | 556 | struct inet_sock *newinet; |
1da177e4 LT |
557 | |
558 | if (!newsk) | |
559 | goto out; | |
560 | ||
561 | sock_init_data(NULL, newsk); | |
562 | ||
914e1c8b | 563 | sctp_copy_sock(newsk, sk, asoc); |
1da177e4 LT |
564 | sock_reset_flag(newsk, SOCK_ZAPPED); |
565 | ||
566 | newinet = inet_sk(newsk); | |
567 | ||
c720c7e8 | 568 | newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; |
1da177e4 | 569 | |
e6848976 | 570 | sk_refcnt_debug_inc(newsk); |
1da177e4 LT |
571 | |
572 | if (newsk->sk_prot->init(newsk)) { | |
573 | sk_common_release(newsk); | |
574 | newsk = NULL; | |
575 | } | |
576 | ||
577 | out: | |
578 | return newsk; | |
579 | } | |
580 | ||
581 | /* Map address, empty for v4 family */ | |
582 | static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) | |
583 | { | |
584 | /* Empty */ | |
585 | } | |
586 | ||
587 | /* Dump the v4 addr to the seq file. */ | |
588 | static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) | |
589 | { | |
21454aaa | 590 | seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); |
1da177e4 LT |
591 | } |
592 | ||
b9031d9d VY |
593 | static void sctp_v4_ecn_capable(struct sock *sk) |
594 | { | |
595 | INET_ECN_xmit(sk); | |
596 | } | |
597 | ||
9f7d653b MH |
598 | void sctp_addr_wq_timeout_handler(unsigned long arg) |
599 | { | |
4db67e80 | 600 | struct net *net = (struct net *)arg; |
9f7d653b MH |
601 | struct sctp_sockaddr_entry *addrw, *temp; |
602 | struct sctp_sock *sp; | |
603 | ||
4db67e80 | 604 | spin_lock_bh(&net->sctp.addr_wq_lock); |
9f7d653b | 605 | |
4db67e80 | 606 | list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { |
9f7d653b | 607 | SCTP_DEBUG_PRINTK_IPADDR("sctp_addrwq_timo_handler: the first ent in wq %p is ", |
4db67e80 | 608 | " for cmd %d at entry %p\n", &net->sctp.addr_waitq, &addrw->a, addrw->state, |
9f7d653b MH |
609 | addrw); |
610 | ||
dfd56b8b | 611 | #if IS_ENABLED(CONFIG_IPV6) |
9f7d653b MH |
612 | /* Now we send an ASCONF for each association */ |
613 | /* Note. we currently don't handle link local IPv6 addressees */ | |
614 | if (addrw->a.sa.sa_family == AF_INET6) { | |
615 | struct in6_addr *in6; | |
616 | ||
617 | if (ipv6_addr_type(&addrw->a.v6.sin6_addr) & | |
618 | IPV6_ADDR_LINKLOCAL) | |
619 | goto free_next; | |
620 | ||
621 | in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr; | |
4db67e80 | 622 | if (ipv6_chk_addr(net, in6, NULL, 0) == 0 && |
9f7d653b MH |
623 | addrw->state == SCTP_ADDR_NEW) { |
624 | unsigned long timeo_val; | |
625 | ||
626 | SCTP_DEBUG_PRINTK("sctp_timo_handler: this is on DAD, trying %d sec later\n", | |
627 | SCTP_ADDRESS_TICK_DELAY); | |
628 | timeo_val = jiffies; | |
629 | timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); | |
4db67e80 | 630 | mod_timer(&net->sctp.addr_wq_timer, timeo_val); |
9f7d653b MH |
631 | break; |
632 | } | |
633 | } | |
5d0c90cf | 634 | #endif |
4db67e80 | 635 | list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) { |
9f7d653b MH |
636 | struct sock *sk; |
637 | ||
638 | sk = sctp_opt2sk(sp); | |
639 | /* ignore bound-specific endpoints */ | |
640 | if (!sctp_is_ep_boundall(sk)) | |
641 | continue; | |
642 | sctp_bh_lock_sock(sk); | |
643 | if (sctp_asconf_mgmt(sp, addrw) < 0) | |
644 | SCTP_DEBUG_PRINTK("sctp_addrwq_timo_handler: sctp_asconf_mgmt failed\n"); | |
645 | sctp_bh_unlock_sock(sk); | |
646 | } | |
39d84a58 | 647 | #if IS_ENABLED(CONFIG_IPV6) |
9f7d653b | 648 | free_next: |
39d84a58 | 649 | #endif |
9f7d653b MH |
650 | list_del(&addrw->list); |
651 | kfree(addrw); | |
652 | } | |
4db67e80 | 653 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
654 | } |
655 | ||
4db67e80 | 656 | static void sctp_free_addr_wq(struct net *net) |
9f7d653b MH |
657 | { |
658 | struct sctp_sockaddr_entry *addrw; | |
659 | struct sctp_sockaddr_entry *temp; | |
660 | ||
4db67e80 EB |
661 | spin_lock_bh(&net->sctp.addr_wq_lock); |
662 | del_timer(&net->sctp.addr_wq_timer); | |
663 | list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { | |
9f7d653b MH |
664 | list_del(&addrw->list); |
665 | kfree(addrw); | |
666 | } | |
4db67e80 | 667 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
668 | } |
669 | ||
670 | /* lookup the entry for the same address in the addr_waitq | |
671 | * sctp_addr_wq MUST be locked | |
672 | */ | |
4db67e80 EB |
673 | static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net, |
674 | struct sctp_sockaddr_entry *addr) | |
9f7d653b MH |
675 | { |
676 | struct sctp_sockaddr_entry *addrw; | |
677 | ||
4db67e80 | 678 | list_for_each_entry(addrw, &net->sctp.addr_waitq, list) { |
9f7d653b MH |
679 | if (addrw->a.sa.sa_family != addr->a.sa.sa_family) |
680 | continue; | |
681 | if (addrw->a.sa.sa_family == AF_INET) { | |
682 | if (addrw->a.v4.sin_addr.s_addr == | |
683 | addr->a.v4.sin_addr.s_addr) | |
684 | return addrw; | |
685 | } else if (addrw->a.sa.sa_family == AF_INET6) { | |
686 | if (ipv6_addr_equal(&addrw->a.v6.sin6_addr, | |
687 | &addr->a.v6.sin6_addr)) | |
688 | return addrw; | |
689 | } | |
690 | } | |
691 | return NULL; | |
692 | } | |
693 | ||
4db67e80 | 694 | void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd) |
9f7d653b MH |
695 | { |
696 | struct sctp_sockaddr_entry *addrw; | |
697 | unsigned long timeo_val; | |
698 | ||
699 | /* first, we check if an opposite message already exist in the queue. | |
700 | * If we found such message, it is removed. | |
701 | * This operation is a bit stupid, but the DHCP client attaches the | |
702 | * new address after a couple of addition and deletion of that address | |
703 | */ | |
704 | ||
4db67e80 | 705 | spin_lock_bh(&net->sctp.addr_wq_lock); |
9f7d653b | 706 | /* Offsets existing events in addr_wq */ |
4db67e80 | 707 | addrw = sctp_addr_wq_lookup(net, addr); |
9f7d653b MH |
708 | if (addrw) { |
709 | if (addrw->state != cmd) { | |
710 | SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt offsets existing entry for %d ", | |
711 | " in wq %p\n", addrw->state, &addrw->a, | |
4db67e80 | 712 | &net->sctp.addr_waitq); |
9f7d653b MH |
713 | list_del(&addrw->list); |
714 | kfree(addrw); | |
715 | } | |
4db67e80 | 716 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
717 | return; |
718 | } | |
719 | ||
720 | /* OK, we have to add the new address to the wait queue */ | |
721 | addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); | |
722 | if (addrw == NULL) { | |
4db67e80 | 723 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
724 | return; |
725 | } | |
726 | addrw->state = cmd; | |
4db67e80 | 727 | list_add_tail(&addrw->list, &net->sctp.addr_waitq); |
9f7d653b | 728 | SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt add new entry for cmd:%d ", |
4db67e80 | 729 | " in wq %p\n", addrw->state, &addrw->a, &net->sctp.addr_waitq); |
9f7d653b | 730 | |
4db67e80 | 731 | if (!timer_pending(&net->sctp.addr_wq_timer)) { |
9f7d653b MH |
732 | timeo_val = jiffies; |
733 | timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); | |
4db67e80 | 734 | mod_timer(&net->sctp.addr_wq_timer, timeo_val); |
9f7d653b | 735 | } |
4db67e80 | 736 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
737 | } |
738 | ||
29303547 VY |
739 | /* Event handler for inet address addition/deletion events. |
740 | * The sctp_local_addr_list needs to be protocted by a spin lock since | |
741 | * multiple notifiers (say IPv4 and IPv6) may be running at the same | |
742 | * time and thus corrupt the list. | |
743 | * The reader side is protected with RCU. | |
744 | */ | |
24123186 AB |
745 | static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, |
746 | void *ptr) | |
1da177e4 | 747 | { |
29c7cf96 | 748 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
29303547 VY |
749 | struct sctp_sockaddr_entry *addr = NULL; |
750 | struct sctp_sockaddr_entry *temp; | |
4db67e80 | 751 | struct net *net = dev_net(ifa->ifa_dev->dev); |
22626216 | 752 | int found = 0; |
1da177e4 | 753 | |
29c7cf96 SS |
754 | switch (ev) { |
755 | case NETDEV_UP: | |
756 | addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); | |
757 | if (addr) { | |
758 | addr->a.v4.sin_family = AF_INET; | |
759 | addr->a.v4.sin_port = 0; | |
760 | addr->a.v4.sin_addr.s_addr = ifa->ifa_local; | |
29303547 | 761 | addr->valid = 1; |
4db67e80 EB |
762 | spin_lock_bh(&net->sctp.local_addr_lock); |
763 | list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list); | |
764 | sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW); | |
765 | spin_unlock_bh(&net->sctp.local_addr_lock); | |
29c7cf96 SS |
766 | } |
767 | break; | |
768 | case NETDEV_DOWN: | |
4db67e80 | 769 | spin_lock_bh(&net->sctp.local_addr_lock); |
29303547 | 770 | list_for_each_entry_safe(addr, temp, |
4db67e80 | 771 | &net->sctp.local_addr_list, list) { |
a40a7d15 PE |
772 | if (addr->a.sa.sa_family == AF_INET && |
773 | addr->a.v4.sin_addr.s_addr == | |
774 | ifa->ifa_local) { | |
4db67e80 | 775 | sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL); |
22626216 | 776 | found = 1; |
29303547 VY |
777 | addr->valid = 0; |
778 | list_del_rcu(&addr->list); | |
29c7cf96 SS |
779 | break; |
780 | } | |
781 | } | |
4db67e80 | 782 | spin_unlock_bh(&net->sctp.local_addr_lock); |
22626216 | 783 | if (found) |
1231f0ba | 784 | kfree_rcu(addr, rcu); |
29c7cf96 SS |
785 | break; |
786 | } | |
1da177e4 LT |
787 | |
788 | return NOTIFY_DONE; | |
789 | } | |
790 | ||
791 | /* | |
792 | * Initialize the control inode/socket with a control endpoint data | |
793 | * structure. This endpoint is reserved exclusively for the OOTB processing. | |
794 | */ | |
2ce95503 | 795 | static int sctp_ctl_sock_init(struct net *net) |
1da177e4 LT |
796 | { |
797 | int err; | |
fb13d9f9 | 798 | sa_family_t family = PF_INET; |
1da177e4 LT |
799 | |
800 | if (sctp_get_pf_specific(PF_INET6)) | |
801 | family = PF_INET6; | |
1da177e4 | 802 | |
2ce95503 EB |
803 | err = inet_ctl_sock_create(&net->sctp.ctl_sock, family, |
804 | SOCK_SEQPACKET, IPPROTO_SCTP, net); | |
fb13d9f9 BH |
805 | |
806 | /* If IPv6 socket could not be created, try the IPv4 socket */ | |
807 | if (err < 0 && family == PF_INET6) | |
2ce95503 | 808 | err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET, |
fb13d9f9 | 809 | SOCK_SEQPACKET, IPPROTO_SCTP, |
2ce95503 | 810 | net); |
fb13d9f9 | 811 | |
1da177e4 | 812 | if (err < 0) { |
145ce502 | 813 | pr_err("Failed to create the SCTP control socket\n"); |
1da177e4 LT |
814 | return err; |
815 | } | |
1da177e4 LT |
816 | return 0; |
817 | } | |
818 | ||
819 | /* Register address family specific functions. */ | |
820 | int sctp_register_af(struct sctp_af *af) | |
821 | { | |
822 | switch (af->sa_family) { | |
823 | case AF_INET: | |
824 | if (sctp_af_v4_specific) | |
825 | return 0; | |
826 | sctp_af_v4_specific = af; | |
827 | break; | |
828 | case AF_INET6: | |
829 | if (sctp_af_v6_specific) | |
830 | return 0; | |
831 | sctp_af_v6_specific = af; | |
832 | break; | |
833 | default: | |
834 | return 0; | |
835 | } | |
836 | ||
837 | INIT_LIST_HEAD(&af->list); | |
838 | list_add_tail(&af->list, &sctp_address_families); | |
839 | return 1; | |
840 | } | |
841 | ||
842 | /* Get the table of functions for manipulating a particular address | |
843 | * family. | |
844 | */ | |
845 | struct sctp_af *sctp_get_af_specific(sa_family_t family) | |
846 | { | |
847 | switch (family) { | |
848 | case AF_INET: | |
849 | return sctp_af_v4_specific; | |
850 | case AF_INET6: | |
851 | return sctp_af_v6_specific; | |
852 | default: | |
853 | return NULL; | |
854 | } | |
855 | } | |
856 | ||
857 | /* Common code to initialize a AF_INET msg_name. */ | |
858 | static void sctp_inet_msgname(char *msgname, int *addr_len) | |
859 | { | |
860 | struct sockaddr_in *sin; | |
861 | ||
862 | sin = (struct sockaddr_in *)msgname; | |
863 | *addr_len = sizeof(struct sockaddr_in); | |
864 | sin->sin_family = AF_INET; | |
865 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
866 | } | |
867 | ||
868 | /* Copy the primary address of the peer primary address as the msg_name. */ | |
869 | static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, | |
870 | int *addr_len) | |
871 | { | |
872 | struct sockaddr_in *sin, *sinfrom; | |
873 | ||
874 | if (msgname) { | |
875 | struct sctp_association *asoc; | |
876 | ||
877 | asoc = event->asoc; | |
878 | sctp_inet_msgname(msgname, addr_len); | |
879 | sin = (struct sockaddr_in *)msgname; | |
880 | sinfrom = &asoc->peer.primary_addr.v4; | |
881 | sin->sin_port = htons(asoc->peer.port); | |
882 | sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; | |
883 | } | |
884 | } | |
885 | ||
886 | /* Initialize and copy out a msgname from an inbound skb. */ | |
887 | static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) | |
888 | { | |
1da177e4 | 889 | if (msgname) { |
2c0fd387 ACM |
890 | struct sctphdr *sh = sctp_hdr(skb); |
891 | struct sockaddr_in *sin = (struct sockaddr_in *)msgname; | |
892 | ||
1da177e4 | 893 | sctp_inet_msgname(msgname, len); |
1da177e4 | 894 | sin->sin_port = sh->source; |
eddc9ec5 | 895 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 LT |
896 | } |
897 | } | |
898 | ||
899 | /* Do we support this AF? */ | |
900 | static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) | |
901 | { | |
902 | /* PF_INET only supports AF_INET addresses. */ | |
a02cec21 | 903 | return AF_INET == family; |
1da177e4 LT |
904 | } |
905 | ||
906 | /* Address matching with wildcards allowed. */ | |
907 | static int sctp_inet_cmp_addr(const union sctp_addr *addr1, | |
908 | const union sctp_addr *addr2, | |
909 | struct sctp_sock *opt) | |
910 | { | |
911 | /* PF_INET only supports AF_INET addresses. */ | |
912 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
913 | return 0; | |
e6f1cebf AV |
914 | if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || |
915 | htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) | |
1da177e4 LT |
916 | return 1; |
917 | if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) | |
918 | return 1; | |
919 | ||
920 | return 0; | |
921 | } | |
922 | ||
923 | /* Verify that provided sockaddr looks bindable. Common verification has | |
924 | * already been taken care of. | |
925 | */ | |
926 | static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
927 | { | |
928 | return sctp_v4_available(addr, opt); | |
929 | } | |
930 | ||
931 | /* Verify that sockaddr looks sendable. Common verification has already | |
932 | * been taken care of. | |
933 | */ | |
934 | static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
935 | { | |
936 | return 1; | |
937 | } | |
938 | ||
939 | /* Fill in Supported Address Type information for INIT and INIT-ACK | |
940 | * chunks. Returns number of addresses supported. | |
941 | */ | |
942 | static int sctp_inet_supported_addrs(const struct sctp_sock *opt, | |
3dbe8656 | 943 | __be16 *types) |
1da177e4 LT |
944 | { |
945 | types[0] = SCTP_PARAM_IPV4_ADDRESS; | |
946 | return 1; | |
947 | } | |
948 | ||
949 | /* Wrapper routine that calls the ip transmit routine. */ | |
950 | static inline int sctp_v4_xmit(struct sk_buff *skb, | |
f880374c | 951 | struct sctp_transport *transport) |
1da177e4 | 952 | { |
f880374c HX |
953 | struct inet_sock *inet = inet_sk(skb->sk); |
954 | ||
21454aaa | 955 | SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", |
0dc47877 | 956 | __func__, skb, skb->len, |
7ef73bca DM |
957 | &transport->fl.u.ip4.saddr, |
958 | &transport->fl.u.ip4.daddr); | |
1da177e4 | 959 | |
f880374c HX |
960 | inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? |
961 | IP_PMTUDISC_DO : IP_PMTUDISC_DONT; | |
962 | ||
1da177e4 | 963 | SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); |
d9d8da80 | 964 | return ip_queue_xmit(skb, &transport->fl); |
1da177e4 LT |
965 | } |
966 | ||
15efbe76 | 967 | static struct sctp_af sctp_af_inet; |
1da177e4 LT |
968 | |
969 | static struct sctp_pf sctp_pf_inet = { | |
970 | .event_msgname = sctp_inet_event_msgname, | |
971 | .skb_msgname = sctp_inet_skb_msgname, | |
972 | .af_supported = sctp_inet_af_supported, | |
973 | .cmp_addr = sctp_inet_cmp_addr, | |
974 | .bind_verify = sctp_inet_bind_verify, | |
975 | .send_verify = sctp_inet_send_verify, | |
976 | .supported_addrs = sctp_inet_supported_addrs, | |
977 | .create_accept_sk = sctp_v4_create_accept_sk, | |
978 | .addr_v4map = sctp_v4_addr_v4map, | |
15efbe76 | 979 | .af = &sctp_af_inet |
1da177e4 LT |
980 | }; |
981 | ||
982 | /* Notifier for inetaddr addition/deletion events. */ | |
983 | static struct notifier_block sctp_inetaddr_notifier = { | |
984 | .notifier_call = sctp_inetaddr_event, | |
985 | }; | |
986 | ||
987 | /* Socket operations. */ | |
90ddc4f0 | 988 | static const struct proto_ops inet_seqpacket_ops = { |
543d9cfe ACM |
989 | .family = PF_INET, |
990 | .owner = THIS_MODULE, | |
991 | .release = inet_release, /* Needs to be wrapped... */ | |
992 | .bind = inet_bind, | |
993 | .connect = inet_dgram_connect, | |
994 | .socketpair = sock_no_socketpair, | |
995 | .accept = inet_accept, | |
996 | .getname = inet_getname, /* Semantics are different. */ | |
997 | .poll = sctp_poll, | |
998 | .ioctl = inet_ioctl, | |
999 | .listen = sctp_inet_listen, | |
1000 | .shutdown = inet_shutdown, /* Looks harmless. */ | |
1001 | .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ | |
1002 | .getsockopt = sock_common_getsockopt, | |
1003 | .sendmsg = inet_sendmsg, | |
1004 | .recvmsg = sock_common_recvmsg, | |
1005 | .mmap = sock_no_mmap, | |
1006 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1007 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1008 | .compat_setsockopt = compat_sock_common_setsockopt, |
1009 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1010 | #endif |
1da177e4 LT |
1011 | }; |
1012 | ||
1013 | /* Registration with AF_INET family. */ | |
1014 | static struct inet_protosw sctp_seqpacket_protosw = { | |
1015 | .type = SOCK_SEQPACKET, | |
1016 | .protocol = IPPROTO_SCTP, | |
1017 | .prot = &sctp_prot, | |
1018 | .ops = &inet_seqpacket_ops, | |
1da177e4 LT |
1019 | .no_check = 0, |
1020 | .flags = SCTP_PROTOSW_FLAG | |
1021 | }; | |
1022 | static struct inet_protosw sctp_stream_protosw = { | |
1023 | .type = SOCK_STREAM, | |
1024 | .protocol = IPPROTO_SCTP, | |
1025 | .prot = &sctp_prot, | |
1026 | .ops = &inet_seqpacket_ops, | |
1da177e4 LT |
1027 | .no_check = 0, |
1028 | .flags = SCTP_PROTOSW_FLAG | |
1029 | }; | |
1030 | ||
1031 | /* Register with IP layer. */ | |
32613090 | 1032 | static const struct net_protocol sctp_protocol = { |
1da177e4 LT |
1033 | .handler = sctp_rcv, |
1034 | .err_handler = sctp_v4_err, | |
1035 | .no_policy = 1, | |
1036 | }; | |
1037 | ||
1038 | /* IPv4 address related functions. */ | |
15efbe76 | 1039 | static struct sctp_af sctp_af_inet = { |
543d9cfe ACM |
1040 | .sa_family = AF_INET, |
1041 | .sctp_xmit = sctp_v4_xmit, | |
1042 | .setsockopt = ip_setsockopt, | |
1043 | .getsockopt = ip_getsockopt, | |
1044 | .get_dst = sctp_v4_get_dst, | |
1045 | .get_saddr = sctp_v4_get_saddr, | |
1046 | .copy_addrlist = sctp_v4_copy_addrlist, | |
1047 | .from_skb = sctp_v4_from_skb, | |
1048 | .from_sk = sctp_v4_from_sk, | |
1049 | .to_sk_saddr = sctp_v4_to_sk_saddr, | |
1050 | .to_sk_daddr = sctp_v4_to_sk_daddr, | |
1051 | .from_addr_param = sctp_v4_from_addr_param, | |
1052 | .to_addr_param = sctp_v4_to_addr_param, | |
543d9cfe ACM |
1053 | .cmp_addr = sctp_v4_cmp_addr, |
1054 | .addr_valid = sctp_v4_addr_valid, | |
1055 | .inaddr_any = sctp_v4_inaddr_any, | |
1056 | .is_any = sctp_v4_is_any, | |
1057 | .available = sctp_v4_available, | |
1058 | .scope = sctp_v4_scope, | |
1059 | .skb_iif = sctp_v4_skb_iif, | |
1060 | .is_ce = sctp_v4_is_ce, | |
1061 | .seq_dump_addr = sctp_v4_seq_dump_addr, | |
b9031d9d | 1062 | .ecn_capable = sctp_v4_ecn_capable, |
543d9cfe ACM |
1063 | .net_header_len = sizeof(struct iphdr), |
1064 | .sockaddr_len = sizeof(struct sockaddr_in), | |
3fdadf7d | 1065 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1066 | .compat_setsockopt = compat_ip_setsockopt, |
1067 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 1068 | #endif |
1da177e4 LT |
1069 | }; |
1070 | ||
1071 | struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { | |
1072 | ||
1073 | switch (family) { | |
1074 | case PF_INET: | |
1075 | return sctp_pf_inet_specific; | |
1076 | case PF_INET6: | |
1077 | return sctp_pf_inet6_specific; | |
1078 | default: | |
1079 | return NULL; | |
1080 | } | |
1081 | } | |
1082 | ||
1083 | /* Register the PF specific function table. */ | |
1084 | int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) | |
1085 | { | |
1086 | switch (family) { | |
1087 | case PF_INET: | |
1088 | if (sctp_pf_inet_specific) | |
1089 | return 0; | |
1090 | sctp_pf_inet_specific = pf; | |
1091 | break; | |
1092 | case PF_INET6: | |
1093 | if (sctp_pf_inet6_specific) | |
1094 | return 0; | |
1095 | sctp_pf_inet6_specific = pf; | |
1096 | break; | |
1097 | default: | |
1098 | return 0; | |
1099 | } | |
1100 | return 1; | |
1101 | } | |
1102 | ||
996b1dba YH |
1103 | static inline int init_sctp_mibs(void) |
1104 | { | |
7d720c3e | 1105 | return snmp_mib_init((void __percpu **)sctp_statistics, |
1823e4c8 ED |
1106 | sizeof(struct sctp_mib), |
1107 | __alignof__(struct sctp_mib)); | |
1da177e4 LT |
1108 | } |
1109 | ||
996b1dba | 1110 | static inline void cleanup_sctp_mibs(void) |
1da177e4 | 1111 | { |
7d720c3e | 1112 | snmp_mib_free((void __percpu **)sctp_statistics); |
1da177e4 LT |
1113 | } |
1114 | ||
270637ab VY |
1115 | static void sctp_v4_pf_init(void) |
1116 | { | |
1117 | /* Initialize the SCTP specific PF functions. */ | |
1118 | sctp_register_pf(&sctp_pf_inet, PF_INET); | |
1119 | sctp_register_af(&sctp_af_inet); | |
1120 | } | |
1121 | ||
1122 | static void sctp_v4_pf_exit(void) | |
1123 | { | |
1124 | list_del(&sctp_af_inet.list); | |
1125 | } | |
1126 | ||
1127 | static int sctp_v4_protosw_init(void) | |
1128 | { | |
1129 | int rc; | |
1130 | ||
1131 | rc = proto_register(&sctp_prot, 1); | |
1132 | if (rc) | |
1133 | return rc; | |
1134 | ||
1135 | /* Register SCTP(UDP and TCP style) with socket layer. */ | |
1136 | inet_register_protosw(&sctp_seqpacket_protosw); | |
1137 | inet_register_protosw(&sctp_stream_protosw); | |
1138 | ||
1139 | return 0; | |
1140 | } | |
1141 | ||
1142 | static void sctp_v4_protosw_exit(void) | |
1143 | { | |
1144 | inet_unregister_protosw(&sctp_stream_protosw); | |
1145 | inet_unregister_protosw(&sctp_seqpacket_protosw); | |
1146 | proto_unregister(&sctp_prot); | |
1147 | } | |
1148 | ||
1149 | static int sctp_v4_add_protocol(void) | |
1150 | { | |
1151 | /* Register notifier for inet address additions/deletions. */ | |
1152 | register_inetaddr_notifier(&sctp_inetaddr_notifier); | |
1153 | ||
1154 | /* Register SCTP with inet layer. */ | |
1155 | if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) | |
1156 | return -EAGAIN; | |
1157 | ||
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | static void sctp_v4_del_protocol(void) | |
1162 | { | |
1163 | inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); | |
1164 | unregister_inetaddr_notifier(&sctp_inetaddr_notifier); | |
1165 | } | |
1166 | ||
4db67e80 EB |
1167 | static int sctp_net_init(struct net *net) |
1168 | { | |
2ce95503 EB |
1169 | int status; |
1170 | ||
13d782f6 EB |
1171 | /* Initialize proc fs directory. */ |
1172 | status = sctp_proc_init(net); | |
1173 | if (status) | |
1174 | goto err_init_proc; | |
1175 | ||
1176 | sctp_dbg_objcnt_init(net); | |
1177 | ||
2ce95503 EB |
1178 | /* Initialize the control inode/socket for handling OOTB packets. */ |
1179 | if ((status = sctp_ctl_sock_init(net))) { | |
1180 | pr_err("Failed to initialize the SCTP control sock\n"); | |
1181 | goto err_ctl_sock_init; | |
1182 | } | |
1183 | ||
4db67e80 EB |
1184 | /* Initialize the local address list. */ |
1185 | INIT_LIST_HEAD(&net->sctp.local_addr_list); | |
1186 | spin_lock_init(&net->sctp.local_addr_lock); | |
1187 | sctp_get_local_addr_list(net); | |
1188 | ||
1189 | /* Initialize the address event list */ | |
1190 | INIT_LIST_HEAD(&net->sctp.addr_waitq); | |
1191 | INIT_LIST_HEAD(&net->sctp.auto_asconf_splist); | |
1192 | spin_lock_init(&net->sctp.addr_wq_lock); | |
1193 | net->sctp.addr_wq_timer.expires = 0; | |
1194 | setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, | |
1195 | (unsigned long)net); | |
1196 | ||
1197 | return 0; | |
2ce95503 EB |
1198 | |
1199 | err_ctl_sock_init: | |
13d782f6 EB |
1200 | sctp_dbg_objcnt_exit(net); |
1201 | sctp_proc_exit(net); | |
1202 | err_init_proc: | |
2ce95503 | 1203 | return status; |
4db67e80 EB |
1204 | } |
1205 | ||
1206 | static void sctp_net_exit(struct net *net) | |
1207 | { | |
1208 | /* Free the local address list */ | |
1209 | sctp_free_addr_wq(net); | |
1210 | sctp_free_local_addr_list(net); | |
2ce95503 EB |
1211 | |
1212 | /* Free the control endpoint. */ | |
1213 | inet_ctl_sock_destroy(net->sctp.ctl_sock); | |
13d782f6 EB |
1214 | |
1215 | sctp_dbg_objcnt_exit(net); | |
1216 | ||
1217 | sctp_proc_exit(net); | |
4db67e80 EB |
1218 | } |
1219 | ||
1220 | static struct pernet_operations sctp_net_ops = { | |
1221 | .init = sctp_net_init, | |
1222 | .exit = sctp_net_exit, | |
1223 | }; | |
1224 | ||
1da177e4 LT |
1225 | /* Initialize the universe into something sensible. */ |
1226 | SCTP_STATIC __init int sctp_init(void) | |
1227 | { | |
1228 | int i; | |
1229 | int status = -EINVAL; | |
1230 | unsigned long goal; | |
4d93df0a NH |
1231 | unsigned long limit; |
1232 | int max_share; | |
1da177e4 LT |
1233 | int order; |
1234 | ||
1235 | /* SCTP_DEBUG sanity check. */ | |
1236 | if (!sctp_sanity_check()) | |
1237 | goto out; | |
1238 | ||
827bf122 | 1239 | /* Allocate bind_bucket and chunk caches. */ |
1da177e4 LT |
1240 | status = -ENOBUFS; |
1241 | sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", | |
1242 | sizeof(struct sctp_bind_bucket), | |
1243 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1244 | NULL); |
1da177e4 | 1245 | if (!sctp_bucket_cachep) |
827bf122 | 1246 | goto out; |
1da177e4 LT |
1247 | |
1248 | sctp_chunk_cachep = kmem_cache_create("sctp_chunk", | |
1249 | sizeof(struct sctp_chunk), | |
1250 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1251 | NULL); |
1da177e4 LT |
1252 | if (!sctp_chunk_cachep) |
1253 | goto err_chunk_cachep; | |
1254 | ||
1255 | /* Allocate and initialise sctp mibs. */ | |
1256 | status = init_sctp_mibs(); | |
1257 | if (status) | |
1258 | goto err_init_mibs; | |
1259 | ||
632c928a EB |
1260 | status = percpu_counter_init(&sctp_sockets_allocated, 0); |
1261 | if (status) | |
1262 | goto err_percpu_counter_init; | |
1263 | ||
1da177e4 LT |
1264 | /* |
1265 | * 14. Suggested SCTP Protocol Parameter Values | |
1266 | */ | |
1267 | /* The following protocol parameters are RECOMMENDED: */ | |
1268 | /* RTO.Initial - 3 seconds */ | |
1269 | sctp_rto_initial = SCTP_RTO_INITIAL; | |
1270 | /* RTO.Min - 1 second */ | |
1271 | sctp_rto_min = SCTP_RTO_MIN; | |
1272 | /* RTO.Max - 60 seconds */ | |
1273 | sctp_rto_max = SCTP_RTO_MAX; | |
1274 | /* RTO.Alpha - 1/8 */ | |
1275 | sctp_rto_alpha = SCTP_RTO_ALPHA; | |
1276 | /* RTO.Beta - 1/4 */ | |
1277 | sctp_rto_beta = SCTP_RTO_BETA; | |
1278 | ||
1279 | /* Valid.Cookie.Life - 60 seconds */ | |
3fd091e7 | 1280 | sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; |
1da177e4 LT |
1281 | |
1282 | /* Whether Cookie Preservative is enabled(1) or not(0) */ | |
1283 | sctp_cookie_preserve_enable = 1; | |
1284 | ||
1285 | /* Max.Burst - 4 */ | |
70331571 | 1286 | sctp_max_burst = SCTP_DEFAULT_MAX_BURST; |
1da177e4 LT |
1287 | |
1288 | /* Association.Max.Retrans - 10 attempts | |
1289 | * Path.Max.Retrans - 5 attempts (per destination address) | |
1290 | * Max.Init.Retransmits - 8 attempts | |
1291 | */ | |
1292 | sctp_max_retrans_association = 10; | |
1293 | sctp_max_retrans_path = 5; | |
1294 | sctp_max_retrans_init = 8; | |
1295 | ||
4eb701df NH |
1296 | /* Sendbuffer growth - do per-socket accounting */ |
1297 | sctp_sndbuf_policy = 0; | |
1298 | ||
049b3ff5 NH |
1299 | /* Rcvbuffer growth - do per-socket accounting */ |
1300 | sctp_rcvbuf_policy = 0; | |
1301 | ||
1da177e4 | 1302 | /* HB.interval - 30 seconds */ |
2f85a429 VY |
1303 | sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; |
1304 | ||
1305 | /* delayed SACK timeout */ | |
1306 | sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; | |
1da177e4 LT |
1307 | |
1308 | /* Implementation specific variables. */ | |
1309 | ||
1310 | /* Initialize default stream count setup information. */ | |
1311 | sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; | |
1312 | sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; | |
1313 | ||
2692ba61 XW |
1314 | /* Initialize maximum autoclose timeout. */ |
1315 | sctp_max_autoclose = INT_MAX / HZ; | |
1316 | ||
1da177e4 LT |
1317 | /* Initialize handle used for association ids. */ |
1318 | idr_init(&sctp_assocs_id); | |
1319 | ||
f03d78db | 1320 | limit = nr_free_buffer_pages() / 8; |
4d93df0a NH |
1321 | limit = max(limit, 128UL); |
1322 | sysctl_sctp_mem[0] = limit / 4 * 3; | |
1323 | sysctl_sctp_mem[1] = limit; | |
1324 | sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; | |
1325 | ||
1326 | /* Set per-socket limits to no more than 1/128 the pressure threshold*/ | |
1327 | limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); | |
1328 | max_share = min(4UL*1024*1024, limit); | |
1329 | ||
845525a6 | 1330 | sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ |
87fb4b7b | 1331 | sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1); |
4d93df0a NH |
1332 | sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); |
1333 | ||
3ab224be | 1334 | sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; |
4d93df0a NH |
1335 | sysctl_sctp_wmem[1] = 16*1024; |
1336 | sysctl_sctp_wmem[2] = max(64*1024, max_share); | |
1337 | ||
1da177e4 LT |
1338 | /* Size and allocate the association hash table. |
1339 | * The methodology is similar to that of the tcp hash tables. | |
1340 | */ | |
4481374c JB |
1341 | if (totalram_pages >= (128 * 1024)) |
1342 | goal = totalram_pages >> (22 - PAGE_SHIFT); | |
1da177e4 | 1343 | else |
4481374c | 1344 | goal = totalram_pages >> (24 - PAGE_SHIFT); |
1da177e4 LT |
1345 | |
1346 | for (order = 0; (1UL << order) < goal; order++) | |
1347 | ; | |
1348 | ||
1349 | do { | |
1350 | sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / | |
1351 | sizeof(struct sctp_hashbucket); | |
1352 | if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) | |
1353 | continue; | |
1354 | sctp_assoc_hashtable = (struct sctp_hashbucket *) | |
a84b50ce | 1355 | __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order); |
1da177e4 LT |
1356 | } while (!sctp_assoc_hashtable && --order > 0); |
1357 | if (!sctp_assoc_hashtable) { | |
145ce502 | 1358 | pr_err("Failed association hash alloc\n"); |
1da177e4 LT |
1359 | status = -ENOMEM; |
1360 | goto err_ahash_alloc; | |
1361 | } | |
1362 | for (i = 0; i < sctp_assoc_hashsize; i++) { | |
1363 | rwlock_init(&sctp_assoc_hashtable[i].lock); | |
d970dbf8 | 1364 | INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); |
1da177e4 LT |
1365 | } |
1366 | ||
1367 | /* Allocate and initialize the endpoint hash table. */ | |
1368 | sctp_ep_hashsize = 64; | |
1369 | sctp_ep_hashtable = (struct sctp_hashbucket *) | |
1370 | kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); | |
1371 | if (!sctp_ep_hashtable) { | |
145ce502 | 1372 | pr_err("Failed endpoint_hash alloc\n"); |
1da177e4 LT |
1373 | status = -ENOMEM; |
1374 | goto err_ehash_alloc; | |
1375 | } | |
1376 | for (i = 0; i < sctp_ep_hashsize; i++) { | |
1377 | rwlock_init(&sctp_ep_hashtable[i].lock); | |
d970dbf8 | 1378 | INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); |
1da177e4 LT |
1379 | } |
1380 | ||
1381 | /* Allocate and initialize the SCTP port hash table. */ | |
1382 | do { | |
1383 | sctp_port_hashsize = (1UL << order) * PAGE_SIZE / | |
1384 | sizeof(struct sctp_bind_hashbucket); | |
1385 | if ((sctp_port_hashsize > (64 * 1024)) && order > 0) | |
1386 | continue; | |
1387 | sctp_port_hashtable = (struct sctp_bind_hashbucket *) | |
a84b50ce | 1388 | __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order); |
1da177e4 LT |
1389 | } while (!sctp_port_hashtable && --order > 0); |
1390 | if (!sctp_port_hashtable) { | |
145ce502 | 1391 | pr_err("Failed bind hash alloc\n"); |
1da177e4 LT |
1392 | status = -ENOMEM; |
1393 | goto err_bhash_alloc; | |
1394 | } | |
1395 | for (i = 0; i < sctp_port_hashsize; i++) { | |
1396 | spin_lock_init(&sctp_port_hashtable[i].lock); | |
d970dbf8 | 1397 | INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); |
1da177e4 LT |
1398 | } |
1399 | ||
145ce502 | 1400 | pr_info("Hash tables configured (established %d bind %d)\n", |
1da177e4 LT |
1401 | sctp_assoc_hashsize, sctp_port_hashsize); |
1402 | ||
1403 | /* Disable ADDIP by default. */ | |
1404 | sctp_addip_enable = 0; | |
73d9c4fd | 1405 | sctp_addip_noauth = 0; |
9f7d653b | 1406 | sctp_default_auto_asconf = 0; |
1da177e4 LT |
1407 | |
1408 | /* Enable PR-SCTP by default. */ | |
1409 | sctp_prsctp_enable = 1; | |
1410 | ||
a29a5bd4 VY |
1411 | /* Disable AUTH by default. */ |
1412 | sctp_auth_enable = 0; | |
1413 | ||
72388433 BD |
1414 | /* Set SCOPE policy to enabled */ |
1415 | sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE; | |
1416 | ||
90f2f531 VY |
1417 | /* Set the default rwnd update threshold */ |
1418 | sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; | |
1419 | ||
1da177e4 LT |
1420 | sctp_sysctl_register(); |
1421 | ||
1422 | INIT_LIST_HEAD(&sctp_address_families); | |
270637ab VY |
1423 | sctp_v4_pf_init(); |
1424 | sctp_v6_pf_init(); | |
1da177e4 | 1425 | |
270637ab | 1426 | status = sctp_v4_protosw_init(); |
827bf122 | 1427 | |
1da177e4 | 1428 | if (status) |
270637ab VY |
1429 | goto err_protosw_init; |
1430 | ||
1431 | status = sctp_v6_protosw_init(); | |
1432 | if (status) | |
1433 | goto err_v6_protosw_init; | |
1da177e4 | 1434 | |
4db67e80 EB |
1435 | status = register_pernet_subsys(&sctp_net_ops); |
1436 | if (status) | |
1437 | goto err_register_pernet_subsys; | |
1438 | ||
270637ab VY |
1439 | status = sctp_v4_add_protocol(); |
1440 | if (status) | |
827bf122 | 1441 | goto err_add_protocol; |
827bf122 SS |
1442 | |
1443 | /* Register SCTP with inet6 layer. */ | |
1444 | status = sctp_v6_add_protocol(); | |
1445 | if (status) | |
1446 | goto err_v6_add_protocol; | |
1447 | ||
1da177e4 LT |
1448 | status = 0; |
1449 | out: | |
1450 | return status; | |
827bf122 | 1451 | err_v6_add_protocol: |
270637ab | 1452 | sctp_v4_del_protocol(); |
d1dd5247 | 1453 | err_add_protocol: |
4db67e80 EB |
1454 | unregister_pernet_subsys(&sctp_net_ops); |
1455 | err_register_pernet_subsys: | |
270637ab VY |
1456 | sctp_v6_protosw_exit(); |
1457 | err_v6_protosw_init: | |
1458 | sctp_v4_protosw_exit(); | |
1459 | err_protosw_init: | |
270637ab VY |
1460 | sctp_v4_pf_exit(); |
1461 | sctp_v6_pf_exit(); | |
1da177e4 | 1462 | sctp_sysctl_unregister(); |
1da177e4 LT |
1463 | free_pages((unsigned long)sctp_port_hashtable, |
1464 | get_order(sctp_port_hashsize * | |
1465 | sizeof(struct sctp_bind_hashbucket))); | |
1466 | err_bhash_alloc: | |
1467 | kfree(sctp_ep_hashtable); | |
1468 | err_ehash_alloc: | |
1469 | free_pages((unsigned long)sctp_assoc_hashtable, | |
1470 | get_order(sctp_assoc_hashsize * | |
1471 | sizeof(struct sctp_hashbucket))); | |
1472 | err_ahash_alloc: | |
632c928a EB |
1473 | percpu_counter_destroy(&sctp_sockets_allocated); |
1474 | err_percpu_counter_init: | |
1da177e4 LT |
1475 | cleanup_sctp_mibs(); |
1476 | err_init_mibs: | |
1477 | kmem_cache_destroy(sctp_chunk_cachep); | |
1478 | err_chunk_cachep: | |
1479 | kmem_cache_destroy(sctp_bucket_cachep); | |
1da177e4 LT |
1480 | goto out; |
1481 | } | |
1482 | ||
1483 | /* Exit handler for the SCTP protocol. */ | |
1484 | SCTP_STATIC __exit void sctp_exit(void) | |
1485 | { | |
1486 | /* BUG. This should probably do something useful like clean | |
1487 | * up all the remaining associations and all that memory. | |
1488 | */ | |
1489 | ||
827bf122 SS |
1490 | /* Unregister with inet6/inet layers. */ |
1491 | sctp_v6_del_protocol(); | |
270637ab | 1492 | sctp_v4_del_protocol(); |
1da177e4 | 1493 | |
4db67e80 EB |
1494 | unregister_pernet_subsys(&sctp_net_ops); |
1495 | ||
270637ab VY |
1496 | /* Free protosw registrations */ |
1497 | sctp_v6_protosw_exit(); | |
1498 | sctp_v4_protosw_exit(); | |
1499 | ||
827bf122 | 1500 | /* Unregister with socket layer. */ |
270637ab VY |
1501 | sctp_v6_pf_exit(); |
1502 | sctp_v4_pf_exit(); | |
827bf122 | 1503 | |
1da177e4 | 1504 | sctp_sysctl_unregister(); |
1da177e4 LT |
1505 | |
1506 | free_pages((unsigned long)sctp_assoc_hashtable, | |
1507 | get_order(sctp_assoc_hashsize * | |
1508 | sizeof(struct sctp_hashbucket))); | |
1509 | kfree(sctp_ep_hashtable); | |
1510 | free_pages((unsigned long)sctp_port_hashtable, | |
1511 | get_order(sctp_port_hashsize * | |
1512 | sizeof(struct sctp_bind_hashbucket))); | |
1513 | ||
632c928a | 1514 | percpu_counter_destroy(&sctp_sockets_allocated); |
1da177e4 LT |
1515 | cleanup_sctp_mibs(); |
1516 | ||
eaa184a1 JDB |
1517 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1518 | ||
827bf122 SS |
1519 | kmem_cache_destroy(sctp_chunk_cachep); |
1520 | kmem_cache_destroy(sctp_bucket_cachep); | |
1da177e4 LT |
1521 | } |
1522 | ||
1523 | module_init(sctp_init); | |
1524 | module_exit(sctp_exit); | |
1525 | ||
bb97d31f ACM |
1526 | /* |
1527 | * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. | |
1528 | */ | |
1529 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); | |
882a382c | 1530 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); |
1da177e4 LT |
1531 | MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); |
1532 | MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); | |
06e86806 LN |
1533 | module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); |
1534 | MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); | |
1da177e4 | 1535 | MODULE_LICENSE("GPL"); |