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48#include <linux/types.h>
49#include <linux/slab.h>
50#include <linux/in.h>
51#include <linux/random.h>
52#include <linux/crypto.h>
53#include <net/sock.h>
54#include <net/ipv6.h>
55#include <net/sctp/sctp.h>
56#include <net/sctp/sm.h>
57
58
59static void sctp_endpoint_bh_rcv(struct work_struct *work);
60
61
62
63
64static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
65 struct sock *sk,
66 gfp_t gfp)
67{
68 struct sctp_hmac_algo_param *auth_hmacs = NULL;
69 struct sctp_chunks_param *auth_chunks = NULL;
70 struct sctp_shared_key *null_key;
71 int err;
72
73 memset(ep, 0, sizeof(struct sctp_endpoint));
74
75 ep->digest = kzalloc(SCTP_SIGNATURE_SIZE, gfp);
76 if (!ep->digest)
77 return NULL;
78
79 if (sctp_auth_enable) {
80
81
82
83
84 auth_hmacs = kzalloc(sizeof(sctp_hmac_algo_param_t) +
85 sizeof(__u16) * SCTP_AUTH_NUM_HMACS, gfp);
86 if (!auth_hmacs)
87 goto nomem;
88
89 auth_chunks = kzalloc(sizeof(sctp_chunks_param_t) +
90 SCTP_NUM_CHUNK_TYPES, gfp);
91 if (!auth_chunks)
92 goto nomem;
93
94
95
96
97
98
99 auth_hmacs->param_hdr.type = SCTP_PARAM_HMAC_ALGO;
100 auth_hmacs->param_hdr.length =
101 htons(sizeof(sctp_paramhdr_t) + 2);
102 auth_hmacs->hmac_ids[0] = htons(SCTP_AUTH_HMAC_ID_SHA1);
103
104
105 auth_chunks->param_hdr.type = SCTP_PARAM_CHUNKS;
106 auth_chunks->param_hdr.length = htons(sizeof(sctp_paramhdr_t));
107
108
109
110
111 if (sctp_addip_enable) {
112 auth_chunks->chunks[0] = SCTP_CID_ASCONF;
113 auth_chunks->chunks[1] = SCTP_CID_ASCONF_ACK;
114 auth_chunks->param_hdr.length =
115 htons(sizeof(sctp_paramhdr_t) + 2);
116 }
117 }
118
119
120
121 ep->base.type = SCTP_EP_TYPE_SOCKET;
122
123
124 atomic_set(&ep->base.refcnt, 1);
125 ep->base.dead = 0;
126 ep->base.malloced = 1;
127
128
129 sctp_inq_init(&ep->base.inqueue);
130
131
132 sctp_inq_set_th_handler(&ep->base.inqueue, sctp_endpoint_bh_rcv);
133
134
135 sctp_bind_addr_init(&ep->base.bind_addr, 0);
136
137
138 ep->base.sk = sk;
139 sock_hold(ep->base.sk);
140
141
142 INIT_LIST_HEAD(&ep->asocs);
143
144
145 ep->sndbuf_policy = sctp_sndbuf_policy;
146
147 sk->sk_write_space = sctp_write_space;
148 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
149
150
151 ep->rcvbuf_policy = sctp_rcvbuf_policy;
152
153
154 get_random_bytes(&ep->secret_key[0], SCTP_SECRET_SIZE);
155 ep->last_key = ep->current_key = 0;
156 ep->key_changed_at = jiffies;
157
158
159 INIT_LIST_HEAD(&ep->endpoint_shared_keys);
160 null_key = sctp_auth_shkey_create(0, GFP_KERNEL);
161 if (!null_key)
162 goto nomem;
163
164 list_add(&null_key->key_list, &ep->endpoint_shared_keys);
165
166
167 err = sctp_auth_init_hmacs(ep, gfp);
168 if (err)
169 goto nomem_hmacs;
170
171
172
173
174 ep->auth_hmacs_list = auth_hmacs;
175 ep->auth_chunk_list = auth_chunks;
176
177 return ep;
178
179nomem_hmacs:
180 sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
181nomem:
182
183 kfree(auth_hmacs);
184 kfree(auth_chunks);
185 kfree(ep->digest);
186 return NULL;
187
188}
189
190
191
192
193struct sctp_endpoint *sctp_endpoint_new(struct sock *sk, gfp_t gfp)
194{
195 struct sctp_endpoint *ep;
196
197
198 ep = t_new(struct sctp_endpoint, gfp);
199 if (!ep)
200 goto fail;
201 if (!sctp_endpoint_init(ep, sk, gfp))
202 goto fail_init;
203 ep->base.malloced = 1;
204 SCTP_DBG_OBJCNT_INC(ep);
205 return ep;
206
207fail_init:
208 kfree(ep);
209fail:
210 return NULL;
211}
212
213
214void sctp_endpoint_add_asoc(struct sctp_endpoint *ep,
215 struct sctp_association *asoc)
216{
217 struct sock *sk = ep->base.sk;
218
219
220
221
222
223 if (asoc->temp)
224 return;
225
226
227 list_add_tail(&asoc->asocs, &ep->asocs);
228
229
230 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
231 sk->sk_ack_backlog++;
232}
233
234
235
236
237void sctp_endpoint_free(struct sctp_endpoint *ep)
238{
239 ep->base.dead = 1;
240
241 ep->base.sk->sk_state = SCTP_SS_CLOSED;
242
243
244 sctp_unhash_endpoint(ep);
245
246 sctp_endpoint_put(ep);
247}
248
249
250static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
251{
252 SCTP_ASSERT(ep->base.dead, "Endpoint is not dead", return);
253
254
255 crypto_free_hash(sctp_sk(ep->base.sk)->hmac);
256
257
258 kfree(ep->digest);
259
260
261
262
263 sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
264 kfree(ep->auth_hmacs_list);
265 kfree(ep->auth_chunk_list);
266
267
268 sctp_auth_destroy_hmacs(ep->auth_hmacs);
269
270
271 sctp_inq_free(&ep->base.inqueue);
272 sctp_bind_addr_free(&ep->base.bind_addr);
273
274
275 if (sctp_sk(ep->base.sk)->bind_hash)
276 sctp_put_port(ep->base.sk);
277
278
279 if (ep->base.sk)
280 sock_put(ep->base.sk);
281
282
283 if (ep->base.malloced) {
284 kfree(ep);
285 SCTP_DBG_OBJCNT_DEC(ep);
286 }
287}
288
289
290void sctp_endpoint_hold(struct sctp_endpoint *ep)
291{
292 atomic_inc(&ep->base.refcnt);
293}
294
295
296
297
298void sctp_endpoint_put(struct sctp_endpoint *ep)
299{
300 if (atomic_dec_and_test(&ep->base.refcnt))
301 sctp_endpoint_destroy(ep);
302}
303
304
305struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *ep,
306 const union sctp_addr *laddr)
307{
308 struct sctp_endpoint *retval = NULL;
309
310 if (htons(ep->base.bind_addr.port) == laddr->v4.sin_port) {
311 if (sctp_bind_addr_match(&ep->base.bind_addr, laddr,
312 sctp_sk(ep->base.sk)))
313 retval = ep;
314 }
315
316 return retval;
317}
318
319
320
321
322
323static struct sctp_association *__sctp_endpoint_lookup_assoc(
324 const struct sctp_endpoint *ep,
325 const union sctp_addr *paddr,
326 struct sctp_transport **transport)
327{
328 struct sctp_association *asoc = NULL;
329 struct sctp_transport *t = NULL;
330 struct sctp_hashbucket *head;
331 struct sctp_ep_common *epb;
332 struct hlist_node *node;
333 int hash;
334 int rport;
335
336 *transport = NULL;
337 rport = ntohs(paddr->v4.sin_port);
338
339 hash = sctp_assoc_hashfn(ep->base.bind_addr.port, rport);
340 head = &sctp_assoc_hashtable[hash];
341 read_lock(&head->lock);
342 sctp_for_each_hentry(epb, node, &head->chain) {
343 asoc = sctp_assoc(epb);
344 if (asoc->ep != ep || rport != asoc->peer.port)
345 goto next;
346
347 t = sctp_assoc_lookup_paddr(asoc, paddr);
348 if (t) {
349 *transport = t;
350 break;
351 }
352next:
353 asoc = NULL;
354 }
355 read_unlock(&head->lock);
356 return asoc;
357}
358
359
360struct sctp_association *sctp_endpoint_lookup_assoc(
361 const struct sctp_endpoint *ep,
362 const union sctp_addr *paddr,
363 struct sctp_transport **transport)
364{
365 struct sctp_association *asoc;
366
367 sctp_local_bh_disable();
368 asoc = __sctp_endpoint_lookup_assoc(ep, paddr, transport);
369 sctp_local_bh_enable();
370
371 return asoc;
372}
373
374
375
376
377int sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
378 const union sctp_addr *paddr)
379{
380 struct sctp_sockaddr_entry *addr;
381 struct sctp_bind_addr *bp;
382
383 bp = &ep->base.bind_addr;
384
385
386
387 list_for_each_entry(addr, &bp->address_list, list) {
388 if (sctp_has_association(&addr->a, paddr))
389 return 1;
390 }
391
392 return 0;
393}
394
395
396
397
398static void sctp_endpoint_bh_rcv(struct work_struct *work)
399{
400 struct sctp_endpoint *ep =
401 container_of(work, struct sctp_endpoint,
402 base.inqueue.immediate);
403 struct sctp_association *asoc;
404 struct sock *sk;
405 struct sctp_transport *transport;
406 struct sctp_chunk *chunk;
407 struct sctp_inq *inqueue;
408 sctp_subtype_t subtype;
409 sctp_state_t state;
410 int error = 0;
411 int first_time = 1;
412
413 if (ep->base.dead)
414 return;
415
416 asoc = NULL;
417 inqueue = &ep->base.inqueue;
418 sk = ep->base.sk;
419
420 while (NULL != (chunk = sctp_inq_pop(inqueue))) {
421 subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type);
422
423
424
425
426 if (first_time && (subtype.chunk == SCTP_CID_AUTH)) {
427 struct sctp_chunkhdr *next_hdr;
428
429 next_hdr = sctp_inq_peek(inqueue);
430 if (!next_hdr)
431 goto normal;
432
433
434
435
436
437
438 if (next_hdr->type == SCTP_CID_COOKIE_ECHO) {
439 chunk->auth_chunk = skb_clone(chunk->skb,
440 GFP_ATOMIC);
441 chunk->auth = 1;
442 continue;
443 }
444 }
445normal:
446
447
448
449
450
451
452 if (NULL == chunk->asoc) {
453 asoc = sctp_endpoint_lookup_assoc(ep,
454 sctp_source(chunk),
455 &transport);
456 chunk->asoc = asoc;
457 chunk->transport = transport;
458 }
459
460 state = asoc ? asoc->state : SCTP_STATE_CLOSED;
461 if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth)
462 continue;
463
464
465
466
467 if (asoc && sctp_chunk_is_data(chunk))
468 asoc->peer.last_data_from = chunk->transport;
469 else
470 SCTP_INC_STATS(SCTP_MIB_INCTRLCHUNKS);
471
472 if (chunk->transport)
473 chunk->transport->last_time_heard = jiffies;
474
475 error = sctp_do_sm(SCTP_EVENT_T_CHUNK, subtype, state,
476 ep, asoc, chunk, GFP_ATOMIC);
477
478 if (error && chunk)
479 chunk->pdiscard = 1;
480
481
482
483
484 if (!sctp_sk(sk)->ep)
485 break;
486
487 if (first_time)
488 first_time = 0;
489 }
490}
491