Commit | Line | Data |
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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 | |
4b2f13a2 JK |
26 | * along with GNU CC; see the file COPYING. If not, see |
27 | * <http://www.gnu.org/licenses/>. | |
1da177e4 LT |
28 | * |
29 | * Please send any bug reports or fixes you make to the | |
30 | * email address(es): | |
91705c61 | 31 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 32 | * |
1da177e4 LT |
33 | * Written or modified by: |
34 | * La Monte H.P. Yarroll <piggy@acm.org> | |
35 | * Karl Knutson <karl@athena.chicago.il.us> | |
36 | * Jon Grimm <jgrimm@us.ibm.com> | |
37 | * Sridhar Samudrala <sri@us.ibm.com> | |
38 | * Daisy Chang <daisyc@us.ibm.com> | |
39 | * Ardelle Fan <ardelle.fan@intel.com> | |
1da177e4 LT |
40 | */ |
41 | ||
145ce502 JP |
42 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
43 | ||
1da177e4 LT |
44 | #include <linux/module.h> |
45 | #include <linux/init.h> | |
46 | #include <linux/netdevice.h> | |
47 | #include <linux/inetdevice.h> | |
48 | #include <linux/seq_file.h> | |
4d93df0a | 49 | #include <linux/bootmem.h> |
845525a6 VY |
50 | #include <linux/highmem.h> |
51 | #include <linux/swap.h> | |
5a0e3ad6 | 52 | #include <linux/slab.h> |
457c4cbc | 53 | #include <net/net_namespace.h> |
1da177e4 LT |
54 | #include <net/protocol.h> |
55 | #include <net/ip.h> | |
56 | #include <net/ipv6.h> | |
14c85021 | 57 | #include <net/route.h> |
1da177e4 LT |
58 | #include <net/sctp/sctp.h> |
59 | #include <net/addrconf.h> | |
60 | #include <net/inet_common.h> | |
61 | #include <net/inet_ecn.h> | |
62 | ||
d9749fb5 NH |
63 | #define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024) |
64 | ||
1da177e4 | 65 | /* Global data structures. */ |
4cbf1cae | 66 | struct sctp_globals sctp_globals __read_mostly; |
1da177e4 LT |
67 | |
68 | struct idr sctp_assocs_id; | |
69 | DEFINE_SPINLOCK(sctp_assocs_id_lock); | |
70 | ||
1da177e4 LT |
71 | static struct sctp_pf *sctp_pf_inet6_specific; |
72 | static struct sctp_pf *sctp_pf_inet_specific; | |
73 | static struct sctp_af *sctp_af_v4_specific; | |
74 | static struct sctp_af *sctp_af_v6_specific; | |
75 | ||
e18b890b CL |
76 | struct kmem_cache *sctp_chunk_cachep __read_mostly; |
77 | struct kmem_cache *sctp_bucket_cachep __read_mostly; | |
1da177e4 | 78 | |
8d987e5c | 79 | long sysctl_sctp_mem[3]; |
007e3936 VY |
80 | int sysctl_sctp_rmem[3]; |
81 | int sysctl_sctp_wmem[3]; | |
4d93df0a | 82 | |
1da177e4 | 83 | /* Set up the proc fs entry for the SCTP protocol. */ |
f5f417c0 | 84 | static int __net_init sctp_proc_init(struct net *net) |
1da177e4 | 85 | { |
c4e85f82 | 86 | #ifdef CONFIG_PROC_FS |
13d782f6 EB |
87 | net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net); |
88 | if (!net->sctp.proc_net_sctp) | |
89 | goto out_proc_net_sctp; | |
90 | if (sctp_snmp_proc_init(net)) | |
80896a35 | 91 | goto out_snmp_proc_init; |
13d782f6 | 92 | if (sctp_eps_proc_init(net)) |
80896a35 | 93 | goto out_eps_proc_init; |
13d782f6 | 94 | if (sctp_assocs_proc_init(net)) |
80896a35 | 95 | goto out_assocs_proc_init; |
13d782f6 | 96 | if (sctp_remaddr_proc_init(net)) |
caea902f | 97 | goto out_remaddr_proc_init; |
1da177e4 LT |
98 | |
99 | return 0; | |
100 | ||
caea902f | 101 | out_remaddr_proc_init: |
13d782f6 | 102 | sctp_assocs_proc_exit(net); |
80896a35 | 103 | out_assocs_proc_init: |
13d782f6 | 104 | sctp_eps_proc_exit(net); |
80896a35 | 105 | out_eps_proc_init: |
13d782f6 | 106 | sctp_snmp_proc_exit(net); |
80896a35 | 107 | out_snmp_proc_init: |
13d782f6 EB |
108 | remove_proc_entry("sctp", net->proc_net); |
109 | net->sctp.proc_net_sctp = NULL; | |
110 | out_proc_net_sctp: | |
157653ce | 111 | return -ENOMEM; |
13d782f6 EB |
112 | #endif /* CONFIG_PROC_FS */ |
113 | return 0; | |
1da177e4 LT |
114 | } |
115 | ||
d808ad9a | 116 | /* Clean up the proc fs entry for the SCTP protocol. |
1da177e4 LT |
117 | * Note: Do not make this __exit as it is used in the init error |
118 | * path. | |
119 | */ | |
13d782f6 | 120 | static void sctp_proc_exit(struct net *net) |
1da177e4 | 121 | { |
c4e85f82 | 122 | #ifdef CONFIG_PROC_FS |
13d782f6 EB |
123 | sctp_snmp_proc_exit(net); |
124 | sctp_eps_proc_exit(net); | |
125 | sctp_assocs_proc_exit(net); | |
126 | sctp_remaddr_proc_exit(net); | |
127 | ||
128 | remove_proc_entry("sctp", net->proc_net); | |
129 | net->sctp.proc_net_sctp = NULL; | |
c4e85f82 | 130 | #endif |
1da177e4 LT |
131 | } |
132 | ||
133 | /* Private helper to extract ipv4 address and stash them in | |
134 | * the protocol structure. | |
135 | */ | |
136 | static void sctp_v4_copy_addrlist(struct list_head *addrlist, | |
137 | struct net_device *dev) | |
138 | { | |
139 | struct in_device *in_dev; | |
140 | struct in_ifaddr *ifa; | |
141 | struct sctp_sockaddr_entry *addr; | |
142 | ||
143 | rcu_read_lock(); | |
e5ed6399 | 144 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { |
1da177e4 LT |
145 | rcu_read_unlock(); |
146 | return; | |
147 | } | |
148 | ||
149 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { | |
150 | /* Add the address to the local list. */ | |
939cfa75 | 151 | addr = kzalloc(sizeof(*addr), GFP_ATOMIC); |
1da177e4 | 152 | if (addr) { |
2a6fd78a | 153 | addr->a.v4.sin_family = AF_INET; |
2a6fd78a | 154 | addr->a.v4.sin_addr.s_addr = ifa->ifa_local; |
29303547 VY |
155 | addr->valid = 1; |
156 | INIT_LIST_HEAD(&addr->list); | |
1da177e4 LT |
157 | list_add_tail(&addr->list, addrlist); |
158 | } | |
159 | } | |
160 | ||
161 | rcu_read_unlock(); | |
162 | } | |
163 | ||
164 | /* Extract our IP addresses from the system and stash them in the | |
165 | * protocol structure. | |
166 | */ | |
4db67e80 | 167 | static void sctp_get_local_addr_list(struct net *net) |
1da177e4 LT |
168 | { |
169 | struct net_device *dev; | |
170 | struct list_head *pos; | |
171 | struct sctp_af *af; | |
172 | ||
c6d14c84 | 173 | rcu_read_lock(); |
4db67e80 | 174 | for_each_netdev_rcu(net, dev) { |
2c0740e4 | 175 | list_for_each(pos, &sctp_address_families) { |
1da177e4 | 176 | af = list_entry(pos, struct sctp_af, list); |
4db67e80 | 177 | af->copy_addrlist(&net->sctp.local_addr_list, dev); |
1da177e4 LT |
178 | } |
179 | } | |
c6d14c84 | 180 | rcu_read_unlock(); |
1da177e4 LT |
181 | } |
182 | ||
1da177e4 | 183 | /* Free the existing local addresses. */ |
4db67e80 | 184 | static void sctp_free_local_addr_list(struct net *net) |
1da177e4 LT |
185 | { |
186 | struct sctp_sockaddr_entry *addr; | |
187 | struct list_head *pos, *temp; | |
188 | ||
4db67e80 | 189 | list_for_each_safe(pos, temp, &net->sctp.local_addr_list) { |
1da177e4 LT |
190 | addr = list_entry(pos, struct sctp_sockaddr_entry, list); |
191 | list_del(pos); | |
192 | kfree(addr); | |
193 | } | |
194 | } | |
195 | ||
1da177e4 | 196 | /* Copy the local addresses which are valid for 'scope' into 'bp'. */ |
4db67e80 | 197 | int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp, |
1c662018 | 198 | enum sctp_scope scope, gfp_t gfp, int copy_flags) |
1da177e4 LT |
199 | { |
200 | struct sctp_sockaddr_entry *addr; | |
2e3ce5bc | 201 | union sctp_addr laddr; |
1da177e4 | 202 | int error = 0; |
1da177e4 | 203 | |
29303547 | 204 | rcu_read_lock(); |
4db67e80 | 205 | list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) { |
29303547 VY |
206 | if (!addr->valid) |
207 | continue; | |
165f2cf6 XL |
208 | if (!sctp_in_scope(net, &addr->a, scope)) |
209 | continue; | |
210 | ||
211 | /* Now that the address is in scope, check to see if | |
212 | * the address type is really supported by the local | |
213 | * sock as well as the remote peer. | |
214 | */ | |
215 | if (addr->a.sa.sa_family == AF_INET && | |
216 | !(copy_flags & SCTP_ADDR4_PEERSUPP)) | |
217 | continue; | |
218 | if (addr->a.sa.sa_family == AF_INET6 && | |
219 | (!(copy_flags & SCTP_ADDR6_ALLOWED) || | |
220 | !(copy_flags & SCTP_ADDR6_PEERSUPP))) | |
221 | continue; | |
222 | ||
2e3ce5bc XL |
223 | laddr = addr->a; |
224 | /* also works for setting ipv6 address port */ | |
225 | laddr.v4.sin_port = htons(bp->port); | |
226 | if (sctp_bind_addr_state(bp, &laddr) != -1) | |
b8607805 XL |
227 | continue; |
228 | ||
165f2cf6 XL |
229 | error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a), |
230 | SCTP_ADDR_SRC, GFP_ATOMIC); | |
231 | if (error) | |
232 | break; | |
1da177e4 LT |
233 | } |
234 | ||
29303547 | 235 | rcu_read_unlock(); |
1da177e4 LT |
236 | return error; |
237 | } | |
238 | ||
239 | /* Initialize a sctp_addr from in incoming skb. */ | |
240 | static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, | |
241 | int is_saddr) | |
242 | { | |
0630c56e MRL |
243 | /* Always called on head skb, so this is safe */ |
244 | struct sctphdr *sh = sctp_hdr(skb); | |
245 | struct sockaddr_in *sa = &addr->v4; | |
1da177e4 | 246 | |
1da177e4 LT |
247 | addr->v4.sin_family = AF_INET; |
248 | ||
1da177e4 | 249 | if (is_saddr) { |
0630c56e MRL |
250 | sa->sin_port = sh->source; |
251 | sa->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
1da177e4 | 252 | } else { |
0630c56e MRL |
253 | sa->sin_port = sh->dest; |
254 | sa->sin_addr.s_addr = ip_hdr(skb)->daddr; | |
1da177e4 | 255 | } |
1da177e4 LT |
256 | } |
257 | ||
258 | /* Initialize an sctp_addr from a socket. */ | |
259 | static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) | |
260 | { | |
261 | addr->v4.sin_family = AF_INET; | |
7dcdbd95 | 262 | addr->v4.sin_port = 0; |
c720c7e8 | 263 | addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr; |
1da177e4 LT |
264 | } |
265 | ||
266 | /* Initialize sk->sk_rcv_saddr from sctp_addr. */ | |
267 | static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) | |
268 | { | |
c720c7e8 | 269 | inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr; |
1da177e4 LT |
270 | } |
271 | ||
272 | /* Initialize sk->sk_daddr from sctp_addr. */ | |
273 | static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) | |
274 | { | |
c720c7e8 | 275 | inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr; |
1da177e4 LT |
276 | } |
277 | ||
278 | /* Initialize a sctp_addr from an address parameter. */ | |
279 | static void sctp_v4_from_addr_param(union sctp_addr *addr, | |
280 | union sctp_addr_param *param, | |
dd86d136 | 281 | __be16 port, int iif) |
1da177e4 LT |
282 | { |
283 | addr->v4.sin_family = AF_INET; | |
284 | addr->v4.sin_port = port; | |
285 | addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; | |
286 | } | |
287 | ||
288 | /* Initialize an address parameter from a sctp_addr and return the length | |
289 | * of the address parameter. | |
290 | */ | |
291 | static int sctp_v4_to_addr_param(const union sctp_addr *addr, | |
292 | union sctp_addr_param *param) | |
293 | { | |
a38905e6 | 294 | int length = sizeof(struct sctp_ipv4addr_param); |
1da177e4 LT |
295 | |
296 | param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; | |
dbc16db1 | 297 | param->v4.param_hdr.length = htons(length); |
d808ad9a | 298 | param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; |
1da177e4 LT |
299 | |
300 | return length; | |
301 | } | |
302 | ||
303 | /* Initialize a sctp_addr from a dst_entry. */ | |
18a353f4 | 304 | static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4, |
854d43a4 | 305 | __be16 port) |
1da177e4 | 306 | { |
1da177e4 LT |
307 | saddr->v4.sin_family = AF_INET; |
308 | saddr->v4.sin_port = port; | |
18a353f4 | 309 | saddr->v4.sin_addr.s_addr = fl4->saddr; |
1da177e4 LT |
310 | } |
311 | ||
312 | /* Compare two addresses exactly. */ | |
313 | static int sctp_v4_cmp_addr(const union sctp_addr *addr1, | |
314 | const union sctp_addr *addr2) | |
315 | { | |
316 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
317 | return 0; | |
318 | if (addr1->v4.sin_port != addr2->v4.sin_port) | |
319 | return 0; | |
320 | if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) | |
321 | return 0; | |
322 | ||
323 | return 1; | |
324 | } | |
325 | ||
326 | /* Initialize addr struct to INADDR_ANY. */ | |
6fbfa9f9 | 327 | static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) |
1da177e4 LT |
328 | { |
329 | addr->v4.sin_family = AF_INET; | |
e6f1cebf | 330 | addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); |
1da177e4 LT |
331 | addr->v4.sin_port = port; |
332 | } | |
333 | ||
334 | /* Is this a wildcard address? */ | |
335 | static int sctp_v4_is_any(const union sctp_addr *addr) | |
336 | { | |
e6f1cebf | 337 | return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; |
1da177e4 LT |
338 | } |
339 | ||
340 | /* This function checks if the address is a valid address to be used for | |
341 | * SCTP binding. | |
342 | * | |
343 | * Output: | |
344 | * Return 0 - If the address is a non-unicast or an illegal address. | |
345 | * Return 1 - If the address is a unicast. | |
346 | */ | |
5636bef7 VY |
347 | static int sctp_v4_addr_valid(union sctp_addr *addr, |
348 | struct sctp_sock *sp, | |
349 | const struct sk_buff *skb) | |
1da177e4 | 350 | { |
7dab83de VY |
351 | /* IPv4 addresses not allowed */ |
352 | if (sp && ipv6_only_sock(sctp_opt2sk(sp))) | |
353 | return 0; | |
354 | ||
1da177e4 | 355 | /* Is this a non-unicast address or a unusable SCTP address? */ |
b5cb2bbc | 356 | if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) |
1da177e4 LT |
357 | return 0; |
358 | ||
d808ad9a | 359 | /* Is this a broadcast address? */ |
511c3f92 | 360 | if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST) |
d808ad9a | 361 | return 0; |
5636bef7 | 362 | |
1da177e4 LT |
363 | return 1; |
364 | } | |
365 | ||
366 | /* Should this be available for binding? */ | |
367 | static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) | |
368 | { | |
bb2db45b EB |
369 | struct net *net = sock_net(&sp->inet.sk); |
370 | int ret = inet_addr_type(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 && | |
49a60158 | 376 | !net->ipv4.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 | 401 | */ |
1c662018 | 402 | static enum sctp_scope sctp_v4_scope(union sctp_addr *addr) |
1da177e4 | 403 | { |
1c662018 | 404 | enum sctp_scope retval; |
1da177e4 | 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 | |
bb33381d DB |
454 | pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr, |
455 | &fl4->saddr); | |
1da177e4 | 456 | |
bb2db45b | 457 | rt = ip_route_output_key(sock_net(sk), 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) { | |
0ca50d12 MRL |
497 | struct net_device *odev; |
498 | ||
559cf710 VY |
499 | if (!laddr->valid) |
500 | continue; | |
07868284 MRL |
501 | if (laddr->state != SCTP_ADDR_SRC || |
502 | AF_INET != laddr->a.sa.sa_family) | |
503 | continue; | |
504 | ||
505 | fl4->fl4_sport = laddr->a.v4.sin_port; | |
506 | flowi4_update_output(fl4, | |
507 | asoc->base.sk->sk_bound_dev_if, | |
508 | RT_CONN_FLAGS(asoc->base.sk), | |
509 | daddr->v4.sin_addr.s_addr, | |
510 | laddr->a.v4.sin_addr.s_addr); | |
511 | ||
512 | rt = ip_route_output_key(sock_net(sk), fl4); | |
513 | if (IS_ERR(rt)) | |
514 | continue; | |
515 | ||
0ca50d12 MRL |
516 | /* Ensure the src address belongs to the output |
517 | * interface. | |
518 | */ | |
519 | odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr, | |
520 | false); | |
d82f0f1f | 521 | if (!odev || odev->ifindex != fl4->flowi4_oif) { |
9f02a069 TR |
522 | if (!dst) |
523 | dst = &rt->dst; | |
524 | else | |
410f0383 | 525 | dst_release(&rt->dst); |
0ca50d12 | 526 | continue; |
d82f0f1f | 527 | } |
0ca50d12 | 528 | |
9f02a069 | 529 | dst_release(dst); |
07868284 MRL |
530 | dst = &rt->dst; |
531 | break; | |
1da177e4 LT |
532 | } |
533 | ||
534 | out_unlock: | |
559cf710 | 535 | rcu_read_unlock(); |
1da177e4 | 536 | out: |
da0420be | 537 | t->dst = dst; |
1da177e4 | 538 | if (dst) |
bb33381d DB |
539 | pr_debug("rt_dst:%pI4, rt_src:%pI4\n", |
540 | &fl4->daddr, &fl4->saddr); | |
1da177e4 | 541 | else |
bb33381d | 542 | pr_debug("no route\n"); |
1da177e4 LT |
543 | } |
544 | ||
545 | /* For v4, the source address is cached in the route entry(dst). So no need | |
546 | * to cache it separately and hence this is an empty routine. | |
547 | */ | |
e5117101 | 548 | static void sctp_v4_get_saddr(struct sctp_sock *sk, |
9914ae3c | 549 | struct sctp_transport *t, |
9914ae3c | 550 | struct flowi *fl) |
1da177e4 | 551 | { |
9914ae3c VY |
552 | union sctp_addr *saddr = &t->saddr; |
553 | struct rtable *rt = (struct rtable *)t->dst; | |
23ec47a0 | 554 | |
1da177e4 LT |
555 | if (rt) { |
556 | saddr->v4.sin_family = AF_INET; | |
902ebd3e | 557 | saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr; |
1da177e4 LT |
558 | } |
559 | } | |
560 | ||
561 | /* What interface did this skb arrive on? */ | |
562 | static int sctp_v4_skb_iif(const struct sk_buff *skb) | |
563 | { | |
92101b3b | 564 | return inet_iif(skb); |
1da177e4 LT |
565 | } |
566 | ||
567 | /* Was this packet marked by Explicit Congestion Notification? */ | |
568 | static int sctp_v4_is_ce(const struct sk_buff *skb) | |
569 | { | |
eddc9ec5 | 570 | return INET_ECN_is_ce(ip_hdr(skb)->tos); |
1da177e4 LT |
571 | } |
572 | ||
573 | /* Create and initialize a new sk for the socket returned by accept(). */ | |
574 | static struct sock *sctp_v4_create_accept_sk(struct sock *sk, | |
cdfbabfb DH |
575 | struct sctp_association *asoc, |
576 | bool kern) | |
1da177e4 | 577 | { |
3b1e0a65 | 578 | struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, |
cdfbabfb | 579 | sk->sk_prot, kern); |
914e1c8b | 580 | struct inet_sock *newinet; |
1da177e4 LT |
581 | |
582 | if (!newsk) | |
583 | goto out; | |
584 | ||
585 | sock_init_data(NULL, newsk); | |
586 | ||
914e1c8b | 587 | sctp_copy_sock(newsk, sk, asoc); |
1da177e4 LT |
588 | sock_reset_flag(newsk, SOCK_ZAPPED); |
589 | ||
590 | newinet = inet_sk(newsk); | |
591 | ||
c720c7e8 | 592 | newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; |
1da177e4 | 593 | |
e6848976 | 594 | sk_refcnt_debug_inc(newsk); |
1da177e4 LT |
595 | |
596 | if (newsk->sk_prot->init(newsk)) { | |
597 | sk_common_release(newsk); | |
598 | newsk = NULL; | |
599 | } | |
600 | ||
601 | out: | |
602 | return newsk; | |
603 | } | |
604 | ||
299ee123 | 605 | static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr) |
1da177e4 | 606 | { |
299ee123 | 607 | /* No address mapping for V4 sockets */ |
a7bc830b | 608 | memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero)); |
299ee123 | 609 | return sizeof(struct sockaddr_in); |
1da177e4 LT |
610 | } |
611 | ||
612 | /* Dump the v4 addr to the seq file. */ | |
613 | static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) | |
614 | { | |
21454aaa | 615 | seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); |
1da177e4 LT |
616 | } |
617 | ||
b9031d9d VY |
618 | static void sctp_v4_ecn_capable(struct sock *sk) |
619 | { | |
620 | INET_ECN_xmit(sk); | |
621 | } | |
622 | ||
bd2a13e2 | 623 | static void sctp_addr_wq_timeout_handler(unsigned long arg) |
9f7d653b | 624 | { |
4db67e80 | 625 | struct net *net = (struct net *)arg; |
9f7d653b MH |
626 | struct sctp_sockaddr_entry *addrw, *temp; |
627 | struct sctp_sock *sp; | |
628 | ||
4db67e80 | 629 | spin_lock_bh(&net->sctp.addr_wq_lock); |
9f7d653b | 630 | |
4db67e80 | 631 | list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { |
bb33381d DB |
632 | pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at " |
633 | "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa, | |
634 | addrw->state, addrw); | |
9f7d653b | 635 | |
dfd56b8b | 636 | #if IS_ENABLED(CONFIG_IPV6) |
9f7d653b MH |
637 | /* Now we send an ASCONF for each association */ |
638 | /* Note. we currently don't handle link local IPv6 addressees */ | |
639 | if (addrw->a.sa.sa_family == AF_INET6) { | |
640 | struct in6_addr *in6; | |
641 | ||
642 | if (ipv6_addr_type(&addrw->a.v6.sin6_addr) & | |
643 | IPV6_ADDR_LINKLOCAL) | |
644 | goto free_next; | |
645 | ||
646 | in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr; | |
4db67e80 | 647 | if (ipv6_chk_addr(net, in6, NULL, 0) == 0 && |
9f7d653b MH |
648 | addrw->state == SCTP_ADDR_NEW) { |
649 | unsigned long timeo_val; | |
650 | ||
bb33381d DB |
651 | pr_debug("%s: this is on DAD, trying %d sec " |
652 | "later\n", __func__, | |
653 | SCTP_ADDRESS_TICK_DELAY); | |
654 | ||
9f7d653b MH |
655 | timeo_val = jiffies; |
656 | timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); | |
4db67e80 | 657 | mod_timer(&net->sctp.addr_wq_timer, timeo_val); |
9f7d653b MH |
658 | break; |
659 | } | |
660 | } | |
5d0c90cf | 661 | #endif |
4db67e80 | 662 | list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) { |
9f7d653b MH |
663 | struct sock *sk; |
664 | ||
665 | sk = sctp_opt2sk(sp); | |
666 | /* ignore bound-specific endpoints */ | |
667 | if (!sctp_is_ep_boundall(sk)) | |
668 | continue; | |
5bc1d1b4 | 669 | bh_lock_sock(sk); |
9f7d653b | 670 | if (sctp_asconf_mgmt(sp, addrw) < 0) |
bb33381d | 671 | pr_debug("%s: sctp_asconf_mgmt failed\n", __func__); |
5bc1d1b4 | 672 | bh_unlock_sock(sk); |
9f7d653b | 673 | } |
39d84a58 | 674 | #if IS_ENABLED(CONFIG_IPV6) |
9f7d653b | 675 | free_next: |
39d84a58 | 676 | #endif |
9f7d653b MH |
677 | list_del(&addrw->list); |
678 | kfree(addrw); | |
679 | } | |
4db67e80 | 680 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
681 | } |
682 | ||
4db67e80 | 683 | static void sctp_free_addr_wq(struct net *net) |
9f7d653b MH |
684 | { |
685 | struct sctp_sockaddr_entry *addrw; | |
686 | struct sctp_sockaddr_entry *temp; | |
687 | ||
4db67e80 EB |
688 | spin_lock_bh(&net->sctp.addr_wq_lock); |
689 | del_timer(&net->sctp.addr_wq_timer); | |
690 | list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { | |
9f7d653b MH |
691 | list_del(&addrw->list); |
692 | kfree(addrw); | |
693 | } | |
4db67e80 | 694 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
695 | } |
696 | ||
697 | /* lookup the entry for the same address in the addr_waitq | |
698 | * sctp_addr_wq MUST be locked | |
699 | */ | |
4db67e80 EB |
700 | static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net, |
701 | struct sctp_sockaddr_entry *addr) | |
9f7d653b MH |
702 | { |
703 | struct sctp_sockaddr_entry *addrw; | |
704 | ||
4db67e80 | 705 | list_for_each_entry(addrw, &net->sctp.addr_waitq, list) { |
9f7d653b MH |
706 | if (addrw->a.sa.sa_family != addr->a.sa.sa_family) |
707 | continue; | |
708 | if (addrw->a.sa.sa_family == AF_INET) { | |
709 | if (addrw->a.v4.sin_addr.s_addr == | |
710 | addr->a.v4.sin_addr.s_addr) | |
711 | return addrw; | |
712 | } else if (addrw->a.sa.sa_family == AF_INET6) { | |
713 | if (ipv6_addr_equal(&addrw->a.v6.sin6_addr, | |
714 | &addr->a.v6.sin6_addr)) | |
715 | return addrw; | |
716 | } | |
717 | } | |
718 | return NULL; | |
719 | } | |
720 | ||
4db67e80 | 721 | void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd) |
9f7d653b MH |
722 | { |
723 | struct sctp_sockaddr_entry *addrw; | |
724 | unsigned long timeo_val; | |
725 | ||
726 | /* first, we check if an opposite message already exist in the queue. | |
727 | * If we found such message, it is removed. | |
728 | * This operation is a bit stupid, but the DHCP client attaches the | |
729 | * new address after a couple of addition and deletion of that address | |
730 | */ | |
731 | ||
4db67e80 | 732 | spin_lock_bh(&net->sctp.addr_wq_lock); |
9f7d653b | 733 | /* Offsets existing events in addr_wq */ |
4db67e80 | 734 | addrw = sctp_addr_wq_lookup(net, addr); |
9f7d653b MH |
735 | if (addrw) { |
736 | if (addrw->state != cmd) { | |
bb33381d DB |
737 | pr_debug("%s: offsets existing entry for %d, addr:%pISc " |
738 | "in wq:%p\n", __func__, addrw->state, &addrw->a.sa, | |
739 | &net->sctp.addr_waitq); | |
740 | ||
9f7d653b MH |
741 | list_del(&addrw->list); |
742 | kfree(addrw); | |
743 | } | |
4db67e80 | 744 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
745 | return; |
746 | } | |
747 | ||
748 | /* OK, we have to add the new address to the wait queue */ | |
749 | addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); | |
750 | if (addrw == NULL) { | |
4db67e80 | 751 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
752 | return; |
753 | } | |
754 | addrw->state = cmd; | |
4db67e80 | 755 | list_add_tail(&addrw->list, &net->sctp.addr_waitq); |
bb33381d DB |
756 | |
757 | pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n", | |
758 | __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq); | |
9f7d653b | 759 | |
4db67e80 | 760 | if (!timer_pending(&net->sctp.addr_wq_timer)) { |
9f7d653b MH |
761 | timeo_val = jiffies; |
762 | timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); | |
4db67e80 | 763 | mod_timer(&net->sctp.addr_wq_timer, timeo_val); |
9f7d653b | 764 | } |
4db67e80 | 765 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
9f7d653b MH |
766 | } |
767 | ||
29303547 VY |
768 | /* Event handler for inet address addition/deletion events. |
769 | * The sctp_local_addr_list needs to be protocted by a spin lock since | |
770 | * multiple notifiers (say IPv4 and IPv6) may be running at the same | |
771 | * time and thus corrupt the list. | |
772 | * The reader side is protected with RCU. | |
773 | */ | |
24123186 AB |
774 | static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, |
775 | void *ptr) | |
1da177e4 | 776 | { |
29c7cf96 | 777 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
29303547 VY |
778 | struct sctp_sockaddr_entry *addr = NULL; |
779 | struct sctp_sockaddr_entry *temp; | |
4db67e80 | 780 | struct net *net = dev_net(ifa->ifa_dev->dev); |
22626216 | 781 | int found = 0; |
1da177e4 | 782 | |
29c7cf96 SS |
783 | switch (ev) { |
784 | case NETDEV_UP: | |
81b2fee6 | 785 | addr = kzalloc(sizeof(*addr), GFP_ATOMIC); |
29c7cf96 SS |
786 | if (addr) { |
787 | addr->a.v4.sin_family = AF_INET; | |
29c7cf96 | 788 | addr->a.v4.sin_addr.s_addr = ifa->ifa_local; |
29303547 | 789 | addr->valid = 1; |
4db67e80 EB |
790 | spin_lock_bh(&net->sctp.local_addr_lock); |
791 | list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list); | |
792 | sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW); | |
793 | spin_unlock_bh(&net->sctp.local_addr_lock); | |
29c7cf96 SS |
794 | } |
795 | break; | |
796 | case NETDEV_DOWN: | |
4db67e80 | 797 | spin_lock_bh(&net->sctp.local_addr_lock); |
29303547 | 798 | list_for_each_entry_safe(addr, temp, |
4db67e80 | 799 | &net->sctp.local_addr_list, list) { |
a40a7d15 PE |
800 | if (addr->a.sa.sa_family == AF_INET && |
801 | addr->a.v4.sin_addr.s_addr == | |
802 | ifa->ifa_local) { | |
4db67e80 | 803 | sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL); |
22626216 | 804 | found = 1; |
29303547 VY |
805 | addr->valid = 0; |
806 | list_del_rcu(&addr->list); | |
29c7cf96 SS |
807 | break; |
808 | } | |
809 | } | |
4db67e80 | 810 | spin_unlock_bh(&net->sctp.local_addr_lock); |
22626216 | 811 | if (found) |
1231f0ba | 812 | kfree_rcu(addr, rcu); |
29c7cf96 SS |
813 | break; |
814 | } | |
1da177e4 LT |
815 | |
816 | return NOTIFY_DONE; | |
817 | } | |
818 | ||
819 | /* | |
820 | * Initialize the control inode/socket with a control endpoint data | |
821 | * structure. This endpoint is reserved exclusively for the OOTB processing. | |
822 | */ | |
2ce95503 | 823 | static int sctp_ctl_sock_init(struct net *net) |
1da177e4 LT |
824 | { |
825 | int err; | |
fb13d9f9 | 826 | sa_family_t family = PF_INET; |
1da177e4 LT |
827 | |
828 | if (sctp_get_pf_specific(PF_INET6)) | |
829 | family = PF_INET6; | |
1da177e4 | 830 | |
2ce95503 EB |
831 | err = inet_ctl_sock_create(&net->sctp.ctl_sock, family, |
832 | SOCK_SEQPACKET, IPPROTO_SCTP, net); | |
fb13d9f9 BH |
833 | |
834 | /* If IPv6 socket could not be created, try the IPv4 socket */ | |
835 | if (err < 0 && family == PF_INET6) | |
2ce95503 | 836 | err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET, |
fb13d9f9 | 837 | SOCK_SEQPACKET, IPPROTO_SCTP, |
2ce95503 | 838 | net); |
fb13d9f9 | 839 | |
1da177e4 | 840 | if (err < 0) { |
145ce502 | 841 | pr_err("Failed to create the SCTP control socket\n"); |
1da177e4 LT |
842 | return err; |
843 | } | |
1da177e4 LT |
844 | return 0; |
845 | } | |
846 | ||
847 | /* Register address family specific functions. */ | |
848 | int sctp_register_af(struct sctp_af *af) | |
849 | { | |
850 | switch (af->sa_family) { | |
851 | case AF_INET: | |
852 | if (sctp_af_v4_specific) | |
853 | return 0; | |
854 | sctp_af_v4_specific = af; | |
855 | break; | |
856 | case AF_INET6: | |
857 | if (sctp_af_v6_specific) | |
858 | return 0; | |
859 | sctp_af_v6_specific = af; | |
860 | break; | |
861 | default: | |
862 | return 0; | |
863 | } | |
864 | ||
865 | INIT_LIST_HEAD(&af->list); | |
866 | list_add_tail(&af->list, &sctp_address_families); | |
867 | return 1; | |
868 | } | |
869 | ||
870 | /* Get the table of functions for manipulating a particular address | |
871 | * family. | |
872 | */ | |
873 | struct sctp_af *sctp_get_af_specific(sa_family_t family) | |
874 | { | |
875 | switch (family) { | |
876 | case AF_INET: | |
877 | return sctp_af_v4_specific; | |
878 | case AF_INET6: | |
879 | return sctp_af_v6_specific; | |
880 | default: | |
881 | return NULL; | |
882 | } | |
883 | } | |
884 | ||
885 | /* Common code to initialize a AF_INET msg_name. */ | |
886 | static void sctp_inet_msgname(char *msgname, int *addr_len) | |
887 | { | |
888 | struct sockaddr_in *sin; | |
889 | ||
890 | sin = (struct sockaddr_in *)msgname; | |
891 | *addr_len = sizeof(struct sockaddr_in); | |
892 | sin->sin_family = AF_INET; | |
893 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
894 | } | |
895 | ||
896 | /* Copy the primary address of the peer primary address as the msg_name. */ | |
897 | static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, | |
898 | int *addr_len) | |
899 | { | |
900 | struct sockaddr_in *sin, *sinfrom; | |
901 | ||
902 | if (msgname) { | |
903 | struct sctp_association *asoc; | |
904 | ||
905 | asoc = event->asoc; | |
906 | sctp_inet_msgname(msgname, addr_len); | |
907 | sin = (struct sockaddr_in *)msgname; | |
908 | sinfrom = &asoc->peer.primary_addr.v4; | |
909 | sin->sin_port = htons(asoc->peer.port); | |
910 | sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; | |
911 | } | |
912 | } | |
913 | ||
914 | /* Initialize and copy out a msgname from an inbound skb. */ | |
915 | static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) | |
916 | { | |
1da177e4 | 917 | if (msgname) { |
2c0fd387 ACM |
918 | struct sctphdr *sh = sctp_hdr(skb); |
919 | struct sockaddr_in *sin = (struct sockaddr_in *)msgname; | |
920 | ||
1da177e4 | 921 | sctp_inet_msgname(msgname, len); |
1da177e4 | 922 | sin->sin_port = sh->source; |
eddc9ec5 | 923 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 LT |
924 | } |
925 | } | |
926 | ||
927 | /* Do we support this AF? */ | |
928 | static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) | |
929 | { | |
930 | /* PF_INET only supports AF_INET addresses. */ | |
a02cec21 | 931 | return AF_INET == family; |
1da177e4 LT |
932 | } |
933 | ||
934 | /* Address matching with wildcards allowed. */ | |
935 | static int sctp_inet_cmp_addr(const union sctp_addr *addr1, | |
936 | const union sctp_addr *addr2, | |
937 | struct sctp_sock *opt) | |
938 | { | |
939 | /* PF_INET only supports AF_INET addresses. */ | |
940 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
941 | return 0; | |
e6f1cebf AV |
942 | if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || |
943 | htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) | |
1da177e4 LT |
944 | return 1; |
945 | if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) | |
946 | return 1; | |
947 | ||
948 | return 0; | |
949 | } | |
950 | ||
951 | /* Verify that provided sockaddr looks bindable. Common verification has | |
952 | * already been taken care of. | |
953 | */ | |
954 | static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
955 | { | |
956 | return sctp_v4_available(addr, opt); | |
957 | } | |
958 | ||
959 | /* Verify that sockaddr looks sendable. Common verification has already | |
960 | * been taken care of. | |
961 | */ | |
962 | static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
963 | { | |
964 | return 1; | |
965 | } | |
966 | ||
967 | /* Fill in Supported Address Type information for INIT and INIT-ACK | |
968 | * chunks. Returns number of addresses supported. | |
969 | */ | |
970 | static int sctp_inet_supported_addrs(const struct sctp_sock *opt, | |
3dbe8656 | 971 | __be16 *types) |
1da177e4 LT |
972 | { |
973 | types[0] = SCTP_PARAM_IPV4_ADDRESS; | |
974 | return 1; | |
975 | } | |
976 | ||
977 | /* Wrapper routine that calls the ip transmit routine. */ | |
978 | static inline int sctp_v4_xmit(struct sk_buff *skb, | |
f880374c | 979 | struct sctp_transport *transport) |
1da177e4 | 980 | { |
f880374c HX |
981 | struct inet_sock *inet = inet_sk(skb->sk); |
982 | ||
bb33381d DB |
983 | pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb, |
984 | skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr); | |
1da177e4 | 985 | |
f880374c HX |
986 | inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? |
987 | IP_PMTUDISC_DO : IP_PMTUDISC_DONT; | |
988 | ||
b01a2407 | 989 | SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS); |
bb33381d | 990 | |
b0270e91 | 991 | return ip_queue_xmit(&inet->sk, skb, &transport->fl); |
1da177e4 LT |
992 | } |
993 | ||
15efbe76 | 994 | static struct sctp_af sctp_af_inet; |
1da177e4 LT |
995 | |
996 | static struct sctp_pf sctp_pf_inet = { | |
997 | .event_msgname = sctp_inet_event_msgname, | |
998 | .skb_msgname = sctp_inet_skb_msgname, | |
999 | .af_supported = sctp_inet_af_supported, | |
1000 | .cmp_addr = sctp_inet_cmp_addr, | |
1001 | .bind_verify = sctp_inet_bind_verify, | |
1002 | .send_verify = sctp_inet_send_verify, | |
1003 | .supported_addrs = sctp_inet_supported_addrs, | |
1004 | .create_accept_sk = sctp_v4_create_accept_sk, | |
299ee123 JG |
1005 | .addr_to_user = sctp_v4_addr_to_user, |
1006 | .to_sk_saddr = sctp_v4_to_sk_saddr, | |
1007 | .to_sk_daddr = sctp_v4_to_sk_daddr, | |
15efbe76 | 1008 | .af = &sctp_af_inet |
1da177e4 LT |
1009 | }; |
1010 | ||
1011 | /* Notifier for inetaddr addition/deletion events. */ | |
1012 | static struct notifier_block sctp_inetaddr_notifier = { | |
1013 | .notifier_call = sctp_inetaddr_event, | |
1014 | }; | |
1015 | ||
1016 | /* Socket operations. */ | |
90ddc4f0 | 1017 | static const struct proto_ops inet_seqpacket_ops = { |
543d9cfe ACM |
1018 | .family = PF_INET, |
1019 | .owner = THIS_MODULE, | |
1020 | .release = inet_release, /* Needs to be wrapped... */ | |
1021 | .bind = inet_bind, | |
1022 | .connect = inet_dgram_connect, | |
1023 | .socketpair = sock_no_socketpair, | |
1024 | .accept = inet_accept, | |
1025 | .getname = inet_getname, /* Semantics are different. */ | |
1026 | .poll = sctp_poll, | |
1027 | .ioctl = inet_ioctl, | |
1028 | .listen = sctp_inet_listen, | |
1029 | .shutdown = inet_shutdown, /* Looks harmless. */ | |
1030 | .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ | |
1031 | .getsockopt = sock_common_getsockopt, | |
1032 | .sendmsg = inet_sendmsg, | |
fd2d180a | 1033 | .recvmsg = inet_recvmsg, |
543d9cfe ACM |
1034 | .mmap = sock_no_mmap, |
1035 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1036 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1037 | .compat_setsockopt = compat_sock_common_setsockopt, |
1038 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1039 | #endif |
1da177e4 LT |
1040 | }; |
1041 | ||
1042 | /* Registration with AF_INET family. */ | |
1043 | static struct inet_protosw sctp_seqpacket_protosw = { | |
1044 | .type = SOCK_SEQPACKET, | |
1045 | .protocol = IPPROTO_SCTP, | |
1046 | .prot = &sctp_prot, | |
1047 | .ops = &inet_seqpacket_ops, | |
1da177e4 LT |
1048 | .flags = SCTP_PROTOSW_FLAG |
1049 | }; | |
1050 | static struct inet_protosw sctp_stream_protosw = { | |
1051 | .type = SOCK_STREAM, | |
1052 | .protocol = IPPROTO_SCTP, | |
1053 | .prot = &sctp_prot, | |
1054 | .ops = &inet_seqpacket_ops, | |
1da177e4 LT |
1055 | .flags = SCTP_PROTOSW_FLAG |
1056 | }; | |
1057 | ||
1058 | /* Register with IP layer. */ | |
32613090 | 1059 | static const struct net_protocol sctp_protocol = { |
1da177e4 LT |
1060 | .handler = sctp_rcv, |
1061 | .err_handler = sctp_v4_err, | |
1062 | .no_policy = 1, | |
bb2db45b | 1063 | .netns_ok = 1, |
8ed1dc44 | 1064 | .icmp_strict_tag_validation = 1, |
1da177e4 LT |
1065 | }; |
1066 | ||
1067 | /* IPv4 address related functions. */ | |
15efbe76 | 1068 | static struct sctp_af sctp_af_inet = { |
543d9cfe ACM |
1069 | .sa_family = AF_INET, |
1070 | .sctp_xmit = sctp_v4_xmit, | |
1071 | .setsockopt = ip_setsockopt, | |
1072 | .getsockopt = ip_getsockopt, | |
1073 | .get_dst = sctp_v4_get_dst, | |
1074 | .get_saddr = sctp_v4_get_saddr, | |
1075 | .copy_addrlist = sctp_v4_copy_addrlist, | |
1076 | .from_skb = sctp_v4_from_skb, | |
1077 | .from_sk = sctp_v4_from_sk, | |
543d9cfe ACM |
1078 | .from_addr_param = sctp_v4_from_addr_param, |
1079 | .to_addr_param = sctp_v4_to_addr_param, | |
543d9cfe ACM |
1080 | .cmp_addr = sctp_v4_cmp_addr, |
1081 | .addr_valid = sctp_v4_addr_valid, | |
1082 | .inaddr_any = sctp_v4_inaddr_any, | |
1083 | .is_any = sctp_v4_is_any, | |
1084 | .available = sctp_v4_available, | |
1085 | .scope = sctp_v4_scope, | |
1086 | .skb_iif = sctp_v4_skb_iif, | |
1087 | .is_ce = sctp_v4_is_ce, | |
1088 | .seq_dump_addr = sctp_v4_seq_dump_addr, | |
b9031d9d | 1089 | .ecn_capable = sctp_v4_ecn_capable, |
543d9cfe ACM |
1090 | .net_header_len = sizeof(struct iphdr), |
1091 | .sockaddr_len = sizeof(struct sockaddr_in), | |
3fdadf7d | 1092 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1093 | .compat_setsockopt = compat_ip_setsockopt, |
1094 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 1095 | #endif |
1da177e4 LT |
1096 | }; |
1097 | ||
8d72651d | 1098 | struct sctp_pf *sctp_get_pf_specific(sa_family_t family) |
1099 | { | |
1da177e4 LT |
1100 | switch (family) { |
1101 | case PF_INET: | |
1102 | return sctp_pf_inet_specific; | |
1103 | case PF_INET6: | |
1104 | return sctp_pf_inet6_specific; | |
1105 | default: | |
1106 | return NULL; | |
1107 | } | |
1108 | } | |
1109 | ||
1110 | /* Register the PF specific function table. */ | |
1111 | int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) | |
1112 | { | |
1113 | switch (family) { | |
1114 | case PF_INET: | |
1115 | if (sctp_pf_inet_specific) | |
1116 | return 0; | |
1117 | sctp_pf_inet_specific = pf; | |
1118 | break; | |
1119 | case PF_INET6: | |
1120 | if (sctp_pf_inet6_specific) | |
1121 | return 0; | |
1122 | sctp_pf_inet6_specific = pf; | |
1123 | break; | |
1124 | default: | |
1125 | return 0; | |
1126 | } | |
1127 | return 1; | |
1128 | } | |
1129 | ||
b01a2407 | 1130 | static inline int init_sctp_mibs(struct net *net) |
996b1dba | 1131 | { |
698365fa WC |
1132 | net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib); |
1133 | if (!net->sctp.sctp_statistics) | |
1134 | return -ENOMEM; | |
1135 | return 0; | |
1da177e4 LT |
1136 | } |
1137 | ||
b01a2407 | 1138 | static inline void cleanup_sctp_mibs(struct net *net) |
1da177e4 | 1139 | { |
698365fa | 1140 | free_percpu(net->sctp.sctp_statistics); |
1da177e4 LT |
1141 | } |
1142 | ||
270637ab VY |
1143 | static void sctp_v4_pf_init(void) |
1144 | { | |
1145 | /* Initialize the SCTP specific PF functions. */ | |
1146 | sctp_register_pf(&sctp_pf_inet, PF_INET); | |
1147 | sctp_register_af(&sctp_af_inet); | |
1148 | } | |
1149 | ||
1150 | static void sctp_v4_pf_exit(void) | |
1151 | { | |
1152 | list_del(&sctp_af_inet.list); | |
1153 | } | |
1154 | ||
1155 | static int sctp_v4_protosw_init(void) | |
1156 | { | |
1157 | int rc; | |
1158 | ||
1159 | rc = proto_register(&sctp_prot, 1); | |
1160 | if (rc) | |
1161 | return rc; | |
1162 | ||
1163 | /* Register SCTP(UDP and TCP style) with socket layer. */ | |
1164 | inet_register_protosw(&sctp_seqpacket_protosw); | |
1165 | inet_register_protosw(&sctp_stream_protosw); | |
1166 | ||
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | static void sctp_v4_protosw_exit(void) | |
1171 | { | |
1172 | inet_unregister_protosw(&sctp_stream_protosw); | |
1173 | inet_unregister_protosw(&sctp_seqpacket_protosw); | |
1174 | proto_unregister(&sctp_prot); | |
1175 | } | |
1176 | ||
1177 | static int sctp_v4_add_protocol(void) | |
1178 | { | |
1179 | /* Register notifier for inet address additions/deletions. */ | |
1180 | register_inetaddr_notifier(&sctp_inetaddr_notifier); | |
1181 | ||
1182 | /* Register SCTP with inet layer. */ | |
1183 | if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) | |
1184 | return -EAGAIN; | |
1185 | ||
1186 | return 0; | |
1187 | } | |
1188 | ||
1189 | static void sctp_v4_del_protocol(void) | |
1190 | { | |
1191 | inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); | |
1192 | unregister_inetaddr_notifier(&sctp_inetaddr_notifier); | |
1193 | } | |
1194 | ||
8e2d61e0 | 1195 | static int __net_init sctp_defaults_init(struct net *net) |
4db67e80 | 1196 | { |
2ce95503 EB |
1197 | int status; |
1198 | ||
e1fc3b14 EB |
1199 | /* |
1200 | * 14. Suggested SCTP Protocol Parameter Values | |
1201 | */ | |
1202 | /* The following protocol parameters are RECOMMENDED: */ | |
1203 | /* RTO.Initial - 3 seconds */ | |
1204 | net->sctp.rto_initial = SCTP_RTO_INITIAL; | |
1205 | /* RTO.Min - 1 second */ | |
1206 | net->sctp.rto_min = SCTP_RTO_MIN; | |
1207 | /* RTO.Max - 60 seconds */ | |
1208 | net->sctp.rto_max = SCTP_RTO_MAX; | |
1209 | /* RTO.Alpha - 1/8 */ | |
1210 | net->sctp.rto_alpha = SCTP_RTO_ALPHA; | |
1211 | /* RTO.Beta - 1/4 */ | |
1212 | net->sctp.rto_beta = SCTP_RTO_BETA; | |
1213 | ||
1214 | /* Valid.Cookie.Life - 60 seconds */ | |
1215 | net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; | |
1216 | ||
1217 | /* Whether Cookie Preservative is enabled(1) or not(0) */ | |
1218 | net->sctp.cookie_preserve_enable = 1; | |
1219 | ||
3c68198e | 1220 | /* Default sctp sockets to use md5 as their hmac alg */ |
0d0863b0 | 1221 | #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5) |
3c68198e | 1222 | net->sctp.sctp_hmac_alg = "md5"; |
0d0863b0 | 1223 | #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1) |
3c68198e NH |
1224 | net->sctp.sctp_hmac_alg = "sha1"; |
1225 | #else | |
1226 | net->sctp.sctp_hmac_alg = NULL; | |
1227 | #endif | |
1228 | ||
e1fc3b14 EB |
1229 | /* Max.Burst - 4 */ |
1230 | net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST; | |
1231 | ||
566178f8 ZY |
1232 | /* Enable pf state by default */ |
1233 | net->sctp.pf_enable = 1; | |
1234 | ||
e1fc3b14 EB |
1235 | /* Association.Max.Retrans - 10 attempts |
1236 | * Path.Max.Retrans - 5 attempts (per destination address) | |
1237 | * Max.Init.Retransmits - 8 attempts | |
1238 | */ | |
1239 | net->sctp.max_retrans_association = 10; | |
1240 | net->sctp.max_retrans_path = 5; | |
1241 | net->sctp.max_retrans_init = 8; | |
1242 | ||
1243 | /* Sendbuffer growth - do per-socket accounting */ | |
1244 | net->sctp.sndbuf_policy = 0; | |
1245 | ||
1246 | /* Rcvbuffer growth - do per-socket accounting */ | |
1247 | net->sctp.rcvbuf_policy = 0; | |
1248 | ||
1249 | /* HB.interval - 30 seconds */ | |
1250 | net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; | |
1251 | ||
1252 | /* delayed SACK timeout */ | |
1253 | net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; | |
1254 | ||
1255 | /* Disable ADDIP by default. */ | |
1256 | net->sctp.addip_enable = 0; | |
1257 | net->sctp.addip_noauth = 0; | |
1258 | net->sctp.default_auto_asconf = 0; | |
1259 | ||
1260 | /* Enable PR-SCTP by default. */ | |
1261 | net->sctp.prsctp_enable = 1; | |
1262 | ||
c28445c3 XL |
1263 | /* Disable RECONF by default. */ |
1264 | net->sctp.reconf_enable = 0; | |
1265 | ||
e1fc3b14 EB |
1266 | /* Disable AUTH by default. */ |
1267 | net->sctp.auth_enable = 0; | |
1268 | ||
1269 | /* Set SCOPE policy to enabled */ | |
1270 | net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE; | |
1271 | ||
1272 | /* Set the default rwnd update threshold */ | |
1273 | net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; | |
1274 | ||
1275 | /* Initialize maximum autoclose timeout. */ | |
1276 | net->sctp.max_autoclose = INT_MAX / HZ; | |
1277 | ||
ebb7e95d EB |
1278 | status = sctp_sysctl_net_register(net); |
1279 | if (status) | |
1280 | goto err_sysctl_register; | |
1281 | ||
b01a2407 EB |
1282 | /* Allocate and initialise sctp mibs. */ |
1283 | status = init_sctp_mibs(net); | |
1284 | if (status) | |
1285 | goto err_init_mibs; | |
1286 | ||
13d782f6 EB |
1287 | /* Initialize proc fs directory. */ |
1288 | status = sctp_proc_init(net); | |
1289 | if (status) | |
1290 | goto err_init_proc; | |
1291 | ||
1292 | sctp_dbg_objcnt_init(net); | |
1293 | ||
4db67e80 EB |
1294 | /* Initialize the local address list. */ |
1295 | INIT_LIST_HEAD(&net->sctp.local_addr_list); | |
1296 | spin_lock_init(&net->sctp.local_addr_lock); | |
1297 | sctp_get_local_addr_list(net); | |
1298 | ||
1299 | /* Initialize the address event list */ | |
1300 | INIT_LIST_HEAD(&net->sctp.addr_waitq); | |
1301 | INIT_LIST_HEAD(&net->sctp.auto_asconf_splist); | |
1302 | spin_lock_init(&net->sctp.addr_wq_lock); | |
1303 | net->sctp.addr_wq_timer.expires = 0; | |
1304 | setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, | |
1305 | (unsigned long)net); | |
1306 | ||
1307 | return 0; | |
2ce95503 | 1308 | |
13d782f6 | 1309 | err_init_proc: |
b01a2407 EB |
1310 | cleanup_sctp_mibs(net); |
1311 | err_init_mibs: | |
ebb7e95d EB |
1312 | sctp_sysctl_net_unregister(net); |
1313 | err_sysctl_register: | |
2ce95503 | 1314 | return status; |
4db67e80 EB |
1315 | } |
1316 | ||
8e2d61e0 | 1317 | static void __net_exit sctp_defaults_exit(struct net *net) |
4db67e80 EB |
1318 | { |
1319 | /* Free the local address list */ | |
1320 | sctp_free_addr_wq(net); | |
1321 | sctp_free_local_addr_list(net); | |
2ce95503 | 1322 | |
13d782f6 EB |
1323 | sctp_dbg_objcnt_exit(net); |
1324 | ||
1325 | sctp_proc_exit(net); | |
b01a2407 | 1326 | cleanup_sctp_mibs(net); |
ebb7e95d | 1327 | sctp_sysctl_net_unregister(net); |
4db67e80 EB |
1328 | } |
1329 | ||
8e2d61e0 MRL |
1330 | static struct pernet_operations sctp_defaults_ops = { |
1331 | .init = sctp_defaults_init, | |
1332 | .exit = sctp_defaults_exit, | |
1333 | }; | |
1334 | ||
1335 | static int __net_init sctp_ctrlsock_init(struct net *net) | |
1336 | { | |
1337 | int status; | |
1338 | ||
1339 | /* Initialize the control inode/socket for handling OOTB packets. */ | |
1340 | status = sctp_ctl_sock_init(net); | |
1341 | if (status) | |
1342 | pr_err("Failed to initialize the SCTP control sock\n"); | |
1343 | ||
1344 | return status; | |
1345 | } | |
1346 | ||
1347 | static void __net_init sctp_ctrlsock_exit(struct net *net) | |
1348 | { | |
1349 | /* Free the control endpoint. */ | |
1350 | inet_ctl_sock_destroy(net->sctp.ctl_sock); | |
1351 | } | |
1352 | ||
1353 | static struct pernet_operations sctp_ctrlsock_ops = { | |
1354 | .init = sctp_ctrlsock_init, | |
1355 | .exit = sctp_ctrlsock_exit, | |
4db67e80 EB |
1356 | }; |
1357 | ||
1da177e4 | 1358 | /* Initialize the universe into something sensible. */ |
dda91928 | 1359 | static __init int sctp_init(void) |
1da177e4 LT |
1360 | { |
1361 | int i; | |
1362 | int status = -EINVAL; | |
1363 | unsigned long goal; | |
4d93df0a NH |
1364 | unsigned long limit; |
1365 | int max_share; | |
1da177e4 | 1366 | int order; |
d9749fb5 NH |
1367 | int num_entries; |
1368 | int max_entry_order; | |
1da177e4 | 1369 | |
b4772ef8 | 1370 | sock_skb_cb_check_size(sizeof(struct sctp_ulpevent)); |
1da177e4 | 1371 | |
827bf122 | 1372 | /* Allocate bind_bucket and chunk caches. */ |
1da177e4 LT |
1373 | status = -ENOBUFS; |
1374 | sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", | |
1375 | sizeof(struct sctp_bind_bucket), | |
1376 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1377 | NULL); |
1da177e4 | 1378 | if (!sctp_bucket_cachep) |
827bf122 | 1379 | goto out; |
1da177e4 LT |
1380 | |
1381 | sctp_chunk_cachep = kmem_cache_create("sctp_chunk", | |
1382 | sizeof(struct sctp_chunk), | |
1383 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1384 | NULL); |
1da177e4 LT |
1385 | if (!sctp_chunk_cachep) |
1386 | goto err_chunk_cachep; | |
1387 | ||
908c7f19 | 1388 | status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL); |
632c928a EB |
1389 | if (status) |
1390 | goto err_percpu_counter_init; | |
1391 | ||
1da177e4 LT |
1392 | /* Implementation specific variables. */ |
1393 | ||
1394 | /* Initialize default stream count setup information. */ | |
1395 | sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; | |
1396 | sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; | |
1397 | ||
1398 | /* Initialize handle used for association ids. */ | |
1399 | idr_init(&sctp_assocs_id); | |
1400 | ||
f03d78db | 1401 | limit = nr_free_buffer_pages() / 8; |
4d93df0a NH |
1402 | limit = max(limit, 128UL); |
1403 | sysctl_sctp_mem[0] = limit / 4 * 3; | |
1404 | sysctl_sctp_mem[1] = limit; | |
1405 | sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; | |
1406 | ||
1407 | /* Set per-socket limits to no more than 1/128 the pressure threshold*/ | |
1408 | limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); | |
1409 | max_share = min(4UL*1024*1024, limit); | |
1410 | ||
845525a6 | 1411 | sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ |
87fb4b7b | 1412 | sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1); |
4d93df0a NH |
1413 | sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); |
1414 | ||
3ab224be | 1415 | sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; |
4d93df0a NH |
1416 | sysctl_sctp_wmem[1] = 16*1024; |
1417 | sysctl_sctp_wmem[2] = max(64*1024, max_share); | |
1418 | ||
1da177e4 LT |
1419 | /* Size and allocate the association hash table. |
1420 | * The methodology is similar to that of the tcp hash tables. | |
d9749fb5 | 1421 | * Though not identical. Start by getting a goal size |
1da177e4 | 1422 | */ |
4481374c JB |
1423 | if (totalram_pages >= (128 * 1024)) |
1424 | goal = totalram_pages >> (22 - PAGE_SHIFT); | |
1da177e4 | 1425 | else |
4481374c | 1426 | goal = totalram_pages >> (24 - PAGE_SHIFT); |
1da177e4 | 1427 | |
d9749fb5 NH |
1428 | /* Then compute the page order for said goal */ |
1429 | order = get_order(goal); | |
1430 | ||
1431 | /* Now compute the required page order for the maximum sized table we | |
1432 | * want to create | |
1433 | */ | |
1434 | max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES * | |
1435 | sizeof(struct sctp_bind_hashbucket)); | |
1436 | ||
1437 | /* Limit the page order by that maximum hash table size */ | |
1438 | order = min(order, max_entry_order); | |
1da177e4 | 1439 | |
1da177e4 LT |
1440 | /* Allocate and initialize the endpoint hash table. */ |
1441 | sctp_ep_hashsize = 64; | |
3b77d661 | 1442 | sctp_ep_hashtable = |
1da177e4 LT |
1443 | kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); |
1444 | if (!sctp_ep_hashtable) { | |
145ce502 | 1445 | pr_err("Failed endpoint_hash alloc\n"); |
1da177e4 LT |
1446 | status = -ENOMEM; |
1447 | goto err_ehash_alloc; | |
1448 | } | |
1449 | for (i = 0; i < sctp_ep_hashsize; i++) { | |
1450 | rwlock_init(&sctp_ep_hashtable[i].lock); | |
d970dbf8 | 1451 | INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); |
1da177e4 LT |
1452 | } |
1453 | ||
d9749fb5 NH |
1454 | /* Allocate and initialize the SCTP port hash table. |
1455 | * Note that order is initalized to start at the max sized | |
1456 | * table we want to support. If we can't get that many pages | |
1457 | * reduce the order and try again | |
1458 | */ | |
1da177e4 | 1459 | do { |
1da177e4 | 1460 | sctp_port_hashtable = (struct sctp_bind_hashbucket *) |
6857a02a | 1461 | __get_free_pages(GFP_KERNEL | __GFP_NOWARN, order); |
1da177e4 | 1462 | } while (!sctp_port_hashtable && --order > 0); |
d9749fb5 | 1463 | |
1da177e4 | 1464 | if (!sctp_port_hashtable) { |
145ce502 | 1465 | pr_err("Failed bind hash alloc\n"); |
1da177e4 LT |
1466 | status = -ENOMEM; |
1467 | goto err_bhash_alloc; | |
1468 | } | |
d9749fb5 NH |
1469 | |
1470 | /* Now compute the number of entries that will fit in the | |
1471 | * port hash space we allocated | |
1472 | */ | |
1473 | num_entries = (1UL << order) * PAGE_SIZE / | |
1474 | sizeof(struct sctp_bind_hashbucket); | |
1475 | ||
1476 | /* And finish by rounding it down to the nearest power of two | |
1477 | * this wastes some memory of course, but its needed because | |
1478 | * the hash function operates based on the assumption that | |
1479 | * that the number of entries is a power of two | |
1480 | */ | |
1481 | sctp_port_hashsize = rounddown_pow_of_two(num_entries); | |
1482 | ||
1da177e4 LT |
1483 | for (i = 0; i < sctp_port_hashsize; i++) { |
1484 | spin_lock_init(&sctp_port_hashtable[i].lock); | |
d970dbf8 | 1485 | INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); |
1da177e4 LT |
1486 | } |
1487 | ||
a5e27d18 WY |
1488 | status = sctp_transport_hashtable_init(); |
1489 | if (status) | |
4f008781 XL |
1490 | goto err_thash_alloc; |
1491 | ||
d9749fb5 NH |
1492 | pr_info("Hash tables configured (bind %d/%d)\n", sctp_port_hashsize, |
1493 | num_entries); | |
1da177e4 | 1494 | |
1da177e4 LT |
1495 | sctp_sysctl_register(); |
1496 | ||
1497 | INIT_LIST_HEAD(&sctp_address_families); | |
270637ab VY |
1498 | sctp_v4_pf_init(); |
1499 | sctp_v6_pf_init(); | |
1da177e4 | 1500 | |
8e2d61e0 MRL |
1501 | status = register_pernet_subsys(&sctp_defaults_ops); |
1502 | if (status) | |
1503 | goto err_register_defaults; | |
827bf122 | 1504 | |
8e2d61e0 | 1505 | status = sctp_v4_protosw_init(); |
1da177e4 | 1506 | if (status) |
270637ab VY |
1507 | goto err_protosw_init; |
1508 | ||
1509 | status = sctp_v6_protosw_init(); | |
1510 | if (status) | |
1511 | goto err_v6_protosw_init; | |
1da177e4 | 1512 | |
8e2d61e0 | 1513 | status = register_pernet_subsys(&sctp_ctrlsock_ops); |
4db67e80 | 1514 | if (status) |
8e2d61e0 | 1515 | goto err_register_ctrlsock; |
4db67e80 | 1516 | |
270637ab VY |
1517 | status = sctp_v4_add_protocol(); |
1518 | if (status) | |
827bf122 | 1519 | goto err_add_protocol; |
827bf122 SS |
1520 | |
1521 | /* Register SCTP with inet6 layer. */ | |
1522 | status = sctp_v6_add_protocol(); | |
1523 | if (status) | |
1524 | goto err_v6_add_protocol; | |
1525 | ||
90017acc MRL |
1526 | if (sctp_offload_init() < 0) |
1527 | pr_crit("%s: Cannot add SCTP protocol offload\n", __func__); | |
1528 | ||
1da177e4 LT |
1529 | out: |
1530 | return status; | |
827bf122 | 1531 | err_v6_add_protocol: |
270637ab | 1532 | sctp_v4_del_protocol(); |
d1dd5247 | 1533 | err_add_protocol: |
8e2d61e0 MRL |
1534 | unregister_pernet_subsys(&sctp_ctrlsock_ops); |
1535 | err_register_ctrlsock: | |
270637ab VY |
1536 | sctp_v6_protosw_exit(); |
1537 | err_v6_protosw_init: | |
1538 | sctp_v4_protosw_exit(); | |
1539 | err_protosw_init: | |
8e2d61e0 MRL |
1540 | unregister_pernet_subsys(&sctp_defaults_ops); |
1541 | err_register_defaults: | |
270637ab VY |
1542 | sctp_v4_pf_exit(); |
1543 | sctp_v6_pf_exit(); | |
1da177e4 | 1544 | sctp_sysctl_unregister(); |
1da177e4 LT |
1545 | free_pages((unsigned long)sctp_port_hashtable, |
1546 | get_order(sctp_port_hashsize * | |
1547 | sizeof(struct sctp_bind_hashbucket))); | |
1548 | err_bhash_alloc: | |
4f008781 XL |
1549 | sctp_transport_hashtable_destroy(); |
1550 | err_thash_alloc: | |
1da177e4 LT |
1551 | kfree(sctp_ep_hashtable); |
1552 | err_ehash_alloc: | |
632c928a EB |
1553 | percpu_counter_destroy(&sctp_sockets_allocated); |
1554 | err_percpu_counter_init: | |
1da177e4 LT |
1555 | kmem_cache_destroy(sctp_chunk_cachep); |
1556 | err_chunk_cachep: | |
1557 | kmem_cache_destroy(sctp_bucket_cachep); | |
1da177e4 LT |
1558 | goto out; |
1559 | } | |
1560 | ||
1561 | /* Exit handler for the SCTP protocol. */ | |
dda91928 | 1562 | static __exit void sctp_exit(void) |
1da177e4 LT |
1563 | { |
1564 | /* BUG. This should probably do something useful like clean | |
1565 | * up all the remaining associations and all that memory. | |
1566 | */ | |
1567 | ||
827bf122 SS |
1568 | /* Unregister with inet6/inet layers. */ |
1569 | sctp_v6_del_protocol(); | |
270637ab | 1570 | sctp_v4_del_protocol(); |
1da177e4 | 1571 | |
8e2d61e0 | 1572 | unregister_pernet_subsys(&sctp_ctrlsock_ops); |
4db67e80 | 1573 | |
270637ab VY |
1574 | /* Free protosw registrations */ |
1575 | sctp_v6_protosw_exit(); | |
1576 | sctp_v4_protosw_exit(); | |
1577 | ||
8e2d61e0 MRL |
1578 | unregister_pernet_subsys(&sctp_defaults_ops); |
1579 | ||
827bf122 | 1580 | /* Unregister with socket layer. */ |
270637ab VY |
1581 | sctp_v6_pf_exit(); |
1582 | sctp_v4_pf_exit(); | |
827bf122 | 1583 | |
1da177e4 | 1584 | sctp_sysctl_unregister(); |
1da177e4 | 1585 | |
1da177e4 LT |
1586 | free_pages((unsigned long)sctp_port_hashtable, |
1587 | get_order(sctp_port_hashsize * | |
1588 | sizeof(struct sctp_bind_hashbucket))); | |
b5eff712 | 1589 | kfree(sctp_ep_hashtable); |
4f008781 | 1590 | sctp_transport_hashtable_destroy(); |
1da177e4 | 1591 | |
632c928a | 1592 | percpu_counter_destroy(&sctp_sockets_allocated); |
1da177e4 | 1593 | |
eaa184a1 JDB |
1594 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1595 | ||
827bf122 SS |
1596 | kmem_cache_destroy(sctp_chunk_cachep); |
1597 | kmem_cache_destroy(sctp_bucket_cachep); | |
1da177e4 LT |
1598 | } |
1599 | ||
1600 | module_init(sctp_init); | |
1601 | module_exit(sctp_exit); | |
1602 | ||
bb97d31f ACM |
1603 | /* |
1604 | * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. | |
1605 | */ | |
1606 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); | |
882a382c | 1607 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); |
91705c61 | 1608 | MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>"); |
1da177e4 | 1609 | MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); |
71acc0dd DM |
1610 | module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); |
1611 | MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); | |
1da177e4 | 1612 | MODULE_LICENSE("GPL"); |