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47505b8b | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
60c778b2 | 2 | /* SCTP kernel implementation |
1da177e4 LT |
3 | * (C) Copyright IBM Corp. 2001, 2004 |
4 | * Copyright (c) 1999-2000 Cisco, Inc. | |
5 | * Copyright (c) 1999-2001 Motorola, Inc. | |
6 | * Copyright (c) 2001 Intel Corp. | |
7 | * Copyright (c) 2001 Nokia, Inc. | |
8 | * Copyright (c) 2001 La Monte H.P. Yarroll | |
9 | * | |
10 | * These functions manipulate an sctp event. The struct ulpevent is used | |
11 | * to carry notifications and data to the ULP (sockets). | |
60c778b2 | 12 | * |
1da177e4 LT |
13 | * Please send any bug reports or fixes you make to the |
14 | * email address(es): | |
91705c61 | 15 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 16 | * |
1da177e4 LT |
17 | * Written or modified by: |
18 | * Jon Grimm <jgrimm@us.ibm.com> | |
19 | * La Monte H.P. Yarroll <piggy@acm.org> | |
20 | * Ardelle Fan <ardelle.fan@intel.com> | |
21 | * Sridhar Samudrala <sri@us.ibm.com> | |
1da177e4 LT |
22 | */ |
23 | ||
5a0e3ad6 | 24 | #include <linux/slab.h> |
1da177e4 LT |
25 | #include <linux/types.h> |
26 | #include <linux/skbuff.h> | |
27 | #include <net/sctp/structs.h> | |
28 | #include <net/sctp/sctp.h> | |
29 | #include <net/sctp/sm.h> | |
30 | ||
31 | static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, | |
32 | struct sctp_association *asoc); | |
33 | static void sctp_ulpevent_release_data(struct sctp_ulpevent *event); | |
d7c2c9e3 TF |
34 | static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event); |
35 | ||
1da177e4 | 36 | |
1da177e4 | 37 | /* Initialize an ULP event from an given skb. */ |
dda91928 | 38 | static void sctp_ulpevent_init(struct sctp_ulpevent *event, |
f5d258e6 | 39 | __u16 msg_flags, |
dda91928 | 40 | unsigned int len) |
1da177e4 LT |
41 | { |
42 | memset(event, 0, sizeof(struct sctp_ulpevent)); | |
43 | event->msg_flags = msg_flags; | |
331c4ee7 | 44 | event->rmem_len = len; |
1da177e4 LT |
45 | } |
46 | ||
47 | /* Create a new sctp_ulpevent. */ | |
f5d258e6 | 48 | static struct sctp_ulpevent *sctp_ulpevent_new(int size, __u16 msg_flags, |
dda91928 | 49 | gfp_t gfp) |
1da177e4 LT |
50 | { |
51 | struct sctp_ulpevent *event; | |
52 | struct sk_buff *skb; | |
53 | ||
54 | skb = alloc_skb(size, gfp); | |
55 | if (!skb) | |
56 | goto fail; | |
57 | ||
58 | event = sctp_skb2event(skb); | |
331c4ee7 | 59 | sctp_ulpevent_init(event, msg_flags, skb->truesize); |
1da177e4 LT |
60 | |
61 | return event; | |
62 | ||
63 | fail: | |
64 | return NULL; | |
65 | } | |
66 | ||
67 | /* Is this a MSG_NOTIFICATION? */ | |
68 | int sctp_ulpevent_is_notification(const struct sctp_ulpevent *event) | |
69 | { | |
70 | return MSG_NOTIFICATION == (event->msg_flags & MSG_NOTIFICATION); | |
71 | } | |
72 | ||
73 | /* Hold the association in case the msg_name needs read out of | |
74 | * the association. | |
75 | */ | |
76 | static inline void sctp_ulpevent_set_owner(struct sctp_ulpevent *event, | |
77 | const struct sctp_association *asoc) | |
78 | { | |
52253db9 | 79 | struct sctp_chunk *chunk = event->chunk; |
1da177e4 LT |
80 | struct sk_buff *skb; |
81 | ||
82 | /* Cast away the const, as we are just wanting to | |
83 | * bump the reference count. | |
84 | */ | |
85 | sctp_association_hold((struct sctp_association *)asoc); | |
86 | skb = sctp_event2skb(event); | |
1da177e4 | 87 | event->asoc = (struct sctp_association *)asoc; |
331c4ee7 VY |
88 | atomic_add(event->rmem_len, &event->asoc->rmem_alloc); |
89 | sctp_skb_set_owner_r(skb, asoc->base.sk); | |
52253db9 MRL |
90 | if (chunk && chunk->head_skb && !chunk->head_skb->sk) |
91 | chunk->head_skb->sk = asoc->base.sk; | |
1da177e4 LT |
92 | } |
93 | ||
94 | /* A simple destructor to give up the reference to the association. */ | |
95 | static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event) | |
96 | { | |
049b3ff5 | 97 | struct sctp_association *asoc = event->asoc; |
049b3ff5 | 98 | |
331c4ee7 | 99 | atomic_sub(event->rmem_len, &asoc->rmem_alloc); |
049b3ff5 | 100 | sctp_association_put(asoc); |
1da177e4 LT |
101 | } |
102 | ||
103 | /* Create and initialize an SCTP_ASSOC_CHANGE event. | |
104 | * | |
105 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
106 | * | |
107 | * Communication notifications inform the ULP that an SCTP association | |
108 | * has either begun or ended. The identifier for a new association is | |
109 | * provided by this notification. | |
110 | * | |
111 | * Note: There is no field checking here. If a field is unused it will be | |
112 | * zero'd out. | |
113 | */ | |
114 | struct sctp_ulpevent *sctp_ulpevent_make_assoc_change( | |
115 | const struct sctp_association *asoc, | |
116 | __u16 flags, __u16 state, __u16 error, __u16 outbound, | |
a5a35e76 | 117 | __u16 inbound, struct sctp_chunk *chunk, gfp_t gfp) |
1da177e4 LT |
118 | { |
119 | struct sctp_ulpevent *event; | |
120 | struct sctp_assoc_change *sac; | |
121 | struct sk_buff *skb; | |
122 | ||
a5a35e76 VY |
123 | /* If the lower layer passed in the chunk, it will be |
124 | * an ABORT, so we need to include it in the sac_info. | |
125 | */ | |
126 | if (chunk) { | |
a5a35e76 VY |
127 | /* Copy the chunk data to a new skb and reserve enough |
128 | * head room to use as notification. | |
129 | */ | |
130 | skb = skb_copy_expand(chunk->skb, | |
131 | sizeof(struct sctp_assoc_change), 0, gfp); | |
132 | ||
133 | if (!skb) | |
134 | goto fail; | |
135 | ||
a5a35e76 VY |
136 | /* Embed the event fields inside the cloned skb. */ |
137 | event = sctp_skb2event(skb); | |
138 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); | |
139 | ||
140 | /* Include the notification structure */ | |
d58ff351 | 141 | sac = skb_push(skb, sizeof(struct sctp_assoc_change)); |
a5a35e76 VY |
142 | |
143 | /* Trim the buffer to the right length. */ | |
144 | skb_trim(skb, sizeof(struct sctp_assoc_change) + | |
ac40e41f | 145 | ntohs(chunk->chunk_hdr->length) - |
922dbc5b | 146 | sizeof(struct sctp_chunkhdr)); |
a5a35e76 VY |
147 | } else { |
148 | event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change), | |
1da177e4 | 149 | MSG_NOTIFICATION, gfp); |
a5a35e76 VY |
150 | if (!event) |
151 | goto fail; | |
152 | ||
153 | skb = sctp_event2skb(event); | |
4df864c1 | 154 | sac = skb_put(skb, sizeof(struct sctp_assoc_change)); |
a5a35e76 | 155 | } |
1da177e4 LT |
156 | |
157 | /* Socket Extensions for SCTP | |
158 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
159 | * | |
160 | * sac_type: | |
161 | * It should be SCTP_ASSOC_CHANGE. | |
162 | */ | |
163 | sac->sac_type = SCTP_ASSOC_CHANGE; | |
164 | ||
165 | /* Socket Extensions for SCTP | |
166 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
167 | * | |
168 | * sac_state: 32 bits (signed integer) | |
169 | * This field holds one of a number of values that communicate the | |
170 | * event that happened to the association. | |
171 | */ | |
172 | sac->sac_state = state; | |
173 | ||
174 | /* Socket Extensions for SCTP | |
175 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
176 | * | |
177 | * sac_flags: 16 bits (unsigned integer) | |
178 | * Currently unused. | |
179 | */ | |
180 | sac->sac_flags = 0; | |
181 | ||
182 | /* Socket Extensions for SCTP | |
183 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
184 | * | |
185 | * sac_length: sizeof (__u32) | |
186 | * This field is the total length of the notification data, including | |
187 | * the notification header. | |
188 | */ | |
b90a137d | 189 | sac->sac_length = skb->len; |
1da177e4 LT |
190 | |
191 | /* Socket Extensions for SCTP | |
192 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
193 | * | |
194 | * sac_error: 32 bits (signed integer) | |
195 | * | |
196 | * If the state was reached due to a error condition (e.g. | |
197 | * COMMUNICATION_LOST) any relevant error information is available in | |
198 | * this field. This corresponds to the protocol error codes defined in | |
199 | * [SCTP]. | |
200 | */ | |
201 | sac->sac_error = error; | |
202 | ||
203 | /* Socket Extensions for SCTP | |
204 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
205 | * | |
206 | * sac_outbound_streams: 16 bits (unsigned integer) | |
207 | * sac_inbound_streams: 16 bits (unsigned integer) | |
208 | * | |
209 | * The maximum number of streams allowed in each direction are | |
210 | * available in sac_outbound_streams and sac_inbound streams. | |
211 | */ | |
212 | sac->sac_outbound_streams = outbound; | |
213 | sac->sac_inbound_streams = inbound; | |
214 | ||
215 | /* Socket Extensions for SCTP | |
216 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
217 | * | |
218 | * sac_assoc_id: sizeof (sctp_assoc_t) | |
219 | * | |
220 | * The association id field, holds the identifier for the association. | |
221 | * All notifications for a given association have the same association | |
222 | * identifier. For TCP style socket, this field is ignored. | |
223 | */ | |
224 | sctp_ulpevent_set_owner(event, asoc); | |
225 | sac->sac_assoc_id = sctp_assoc2id(asoc); | |
226 | ||
227 | return event; | |
228 | ||
229 | fail: | |
230 | return NULL; | |
231 | } | |
232 | ||
233 | /* Create and initialize an SCTP_PEER_ADDR_CHANGE event. | |
234 | * | |
235 | * Socket Extensions for SCTP - draft-01 | |
236 | * 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
237 | * | |
238 | * When a destination address on a multi-homed peer encounters a change | |
239 | * an interface details event is sent. | |
240 | */ | |
4b774032 | 241 | static struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change( |
1da177e4 LT |
242 | const struct sctp_association *asoc, |
243 | const struct sockaddr_storage *aaddr, | |
dd0fc66f | 244 | int flags, int state, int error, gfp_t gfp) |
1da177e4 LT |
245 | { |
246 | struct sctp_ulpevent *event; | |
247 | struct sctp_paddr_change *spc; | |
248 | struct sk_buff *skb; | |
249 | ||
250 | event = sctp_ulpevent_new(sizeof(struct sctp_paddr_change), | |
251 | MSG_NOTIFICATION, gfp); | |
252 | if (!event) | |
253 | goto fail; | |
254 | ||
255 | skb = sctp_event2skb(event); | |
4df864c1 | 256 | spc = skb_put(skb, sizeof(struct sctp_paddr_change)); |
1da177e4 LT |
257 | |
258 | /* Sockets API Extensions for SCTP | |
259 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
260 | * | |
261 | * spc_type: | |
262 | * | |
263 | * It should be SCTP_PEER_ADDR_CHANGE. | |
264 | */ | |
265 | spc->spc_type = SCTP_PEER_ADDR_CHANGE; | |
266 | ||
267 | /* Sockets API Extensions for SCTP | |
268 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
269 | * | |
270 | * spc_length: sizeof (__u32) | |
271 | * | |
272 | * This field is the total length of the notification data, including | |
273 | * the notification header. | |
274 | */ | |
275 | spc->spc_length = sizeof(struct sctp_paddr_change); | |
276 | ||
277 | /* Sockets API Extensions for SCTP | |
278 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
279 | * | |
280 | * spc_flags: 16 bits (unsigned integer) | |
281 | * Currently unused. | |
282 | */ | |
283 | spc->spc_flags = 0; | |
284 | ||
285 | /* Sockets API Extensions for SCTP | |
286 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
287 | * | |
288 | * spc_state: 32 bits (signed integer) | |
289 | * | |
290 | * This field holds one of a number of values that communicate the | |
291 | * event that happened to the address. | |
292 | */ | |
293 | spc->spc_state = state; | |
294 | ||
295 | /* Sockets API Extensions for SCTP | |
296 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
297 | * | |
298 | * spc_error: 32 bits (signed integer) | |
299 | * | |
300 | * If the state was reached due to any error condition (e.g. | |
301 | * ADDRESS_UNREACHABLE) any relevant error information is available in | |
302 | * this field. | |
303 | */ | |
304 | spc->spc_error = error; | |
305 | ||
306 | /* Socket Extensions for SCTP | |
307 | * 5.3.1.1 SCTP_ASSOC_CHANGE | |
308 | * | |
309 | * spc_assoc_id: sizeof (sctp_assoc_t) | |
310 | * | |
311 | * The association id field, holds the identifier for the association. | |
312 | * All notifications for a given association have the same association | |
313 | * identifier. For TCP style socket, this field is ignored. | |
314 | */ | |
315 | sctp_ulpevent_set_owner(event, asoc); | |
316 | spc->spc_assoc_id = sctp_assoc2id(asoc); | |
317 | ||
318 | /* Sockets API Extensions for SCTP | |
319 | * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE | |
320 | * | |
321 | * spc_aaddr: sizeof (struct sockaddr_storage) | |
322 | * | |
323 | * The affected address field, holds the remote peer's address that is | |
324 | * encountering the change of state. | |
325 | */ | |
326 | memcpy(&spc->spc_aaddr, aaddr, sizeof(struct sockaddr_storage)); | |
327 | ||
328 | /* Map ipv4 address into v4-mapped-on-v6 address. */ | |
299ee123 | 329 | sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_to_user( |
1da177e4 LT |
330 | sctp_sk(asoc->base.sk), |
331 | (union sctp_addr *)&spc->spc_aaddr); | |
332 | ||
333 | return event; | |
334 | ||
335 | fail: | |
336 | return NULL; | |
337 | } | |
338 | ||
4b774032 XL |
339 | void sctp_ulpevent_nofity_peer_addr_change(struct sctp_transport *transport, |
340 | int state, int error) | |
341 | { | |
342 | struct sctp_association *asoc = transport->asoc; | |
343 | struct sockaddr_storage addr; | |
344 | struct sctp_ulpevent *event; | |
345 | ||
346 | memset(&addr, 0, sizeof(struct sockaddr_storage)); | |
347 | memcpy(&addr, &transport->ipaddr, transport->af_specific->sockaddr_len); | |
348 | ||
349 | event = sctp_ulpevent_make_peer_addr_change(asoc, &addr, 0, state, | |
350 | error, GFP_ATOMIC); | |
351 | if (event) | |
352 | asoc->stream.si->enqueue_event(&asoc->ulpq, event); | |
353 | } | |
354 | ||
1da177e4 LT |
355 | /* Create and initialize an SCTP_REMOTE_ERROR notification. |
356 | * | |
357 | * Note: This assumes that the chunk->skb->data already points to the | |
358 | * operation error payload. | |
359 | * | |
360 | * Socket Extensions for SCTP - draft-01 | |
361 | * 5.3.1.3 SCTP_REMOTE_ERROR | |
362 | * | |
363 | * A remote peer may send an Operational Error message to its peer. | |
364 | * This message indicates a variety of error conditions on an | |
365 | * association. The entire error TLV as it appears on the wire is | |
366 | * included in a SCTP_REMOTE_ERROR event. Please refer to the SCTP | |
367 | * specification [SCTP] and any extensions for a list of possible | |
368 | * error formats. | |
369 | */ | |
8f2e5ae4 DB |
370 | struct sctp_ulpevent * |
371 | sctp_ulpevent_make_remote_error(const struct sctp_association *asoc, | |
372 | struct sctp_chunk *chunk, __u16 flags, | |
373 | gfp_t gfp) | |
1da177e4 | 374 | { |
1da177e4 | 375 | struct sctp_remote_error *sre; |
d8238d9d XL |
376 | struct sctp_ulpevent *event; |
377 | struct sctp_errhdr *ch; | |
1da177e4 | 378 | struct sk_buff *skb; |
9f81bcd9 | 379 | __be16 cause; |
1da177e4 LT |
380 | int elen; |
381 | ||
d8238d9d | 382 | ch = (struct sctp_errhdr *)(chunk->skb->data); |
1da177e4 | 383 | cause = ch->cause; |
d8238d9d | 384 | elen = SCTP_PAD4(ntohs(ch->length)) - sizeof(*ch); |
1da177e4 LT |
385 | |
386 | /* Pull off the ERROR header. */ | |
d8238d9d | 387 | skb_pull(chunk->skb, sizeof(*ch)); |
1da177e4 LT |
388 | |
389 | /* Copy the skb to a new skb with room for us to prepend | |
390 | * notification with. | |
391 | */ | |
8f2e5ae4 | 392 | skb = skb_copy_expand(chunk->skb, sizeof(*sre), 0, gfp); |
1da177e4 LT |
393 | |
394 | /* Pull off the rest of the cause TLV from the chunk. */ | |
395 | skb_pull(chunk->skb, elen); | |
396 | if (!skb) | |
397 | goto fail; | |
398 | ||
399 | /* Embed the event fields inside the cloned skb. */ | |
400 | event = sctp_skb2event(skb); | |
331c4ee7 | 401 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
1da177e4 | 402 | |
d58ff351 | 403 | sre = skb_push(skb, sizeof(*sre)); |
1da177e4 LT |
404 | |
405 | /* Trim the buffer to the right length. */ | |
8f2e5ae4 | 406 | skb_trim(skb, sizeof(*sre) + elen); |
1da177e4 | 407 | |
8f2e5ae4 DB |
408 | /* RFC6458, Section 6.1.3. SCTP_REMOTE_ERROR */ |
409 | memset(sre, 0, sizeof(*sre)); | |
1da177e4 | 410 | sre->sre_type = SCTP_REMOTE_ERROR; |
1da177e4 | 411 | sre->sre_flags = 0; |
1da177e4 | 412 | sre->sre_length = skb->len; |
1da177e4 | 413 | sre->sre_error = cause; |
1da177e4 LT |
414 | sctp_ulpevent_set_owner(event, asoc); |
415 | sre->sre_assoc_id = sctp_assoc2id(asoc); | |
416 | ||
417 | return event; | |
1da177e4 LT |
418 | fail: |
419 | return NULL; | |
420 | } | |
421 | ||
422 | /* Create and initialize a SCTP_SEND_FAILED notification. | |
423 | * | |
424 | * Socket Extensions for SCTP - draft-01 | |
425 | * 5.3.1.4 SCTP_SEND_FAILED | |
426 | */ | |
427 | struct sctp_ulpevent *sctp_ulpevent_make_send_failed( | |
428 | const struct sctp_association *asoc, struct sctp_chunk *chunk, | |
dd0fc66f | 429 | __u16 flags, __u32 error, gfp_t gfp) |
1da177e4 LT |
430 | { |
431 | struct sctp_ulpevent *event; | |
432 | struct sctp_send_failed *ssf; | |
433 | struct sk_buff *skb; | |
434 | ||
435 | /* Pull off any padding. */ | |
436 | int len = ntohs(chunk->chunk_hdr->length); | |
437 | ||
438 | /* Make skb with more room so we can prepend notification. */ | |
439 | skb = skb_copy_expand(chunk->skb, | |
440 | sizeof(struct sctp_send_failed), /* headroom */ | |
441 | 0, /* tailroom */ | |
442 | gfp); | |
443 | if (!skb) | |
444 | goto fail; | |
445 | ||
446 | /* Pull off the common chunk header and DATA header. */ | |
668c9beb XL |
447 | skb_pull(skb, sctp_datachk_len(&asoc->stream)); |
448 | len -= sctp_datachk_len(&asoc->stream); | |
1da177e4 LT |
449 | |
450 | /* Embed the event fields inside the cloned skb. */ | |
451 | event = sctp_skb2event(skb); | |
331c4ee7 | 452 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
1da177e4 | 453 | |
d58ff351 | 454 | ssf = skb_push(skb, sizeof(struct sctp_send_failed)); |
1da177e4 LT |
455 | |
456 | /* Socket Extensions for SCTP | |
457 | * 5.3.1.4 SCTP_SEND_FAILED | |
458 | * | |
459 | * ssf_type: | |
460 | * It should be SCTP_SEND_FAILED. | |
461 | */ | |
462 | ssf->ssf_type = SCTP_SEND_FAILED; | |
463 | ||
464 | /* Socket Extensions for SCTP | |
465 | * 5.3.1.4 SCTP_SEND_FAILED | |
466 | * | |
467 | * ssf_flags: 16 bits (unsigned integer) | |
468 | * The flag value will take one of the following values | |
469 | * | |
470 | * SCTP_DATA_UNSENT - Indicates that the data was never put on | |
471 | * the wire. | |
472 | * | |
473 | * SCTP_DATA_SENT - Indicates that the data was put on the wire. | |
474 | * Note that this does not necessarily mean that the | |
475 | * data was (or was not) successfully delivered. | |
476 | */ | |
477 | ssf->ssf_flags = flags; | |
478 | ||
479 | /* Socket Extensions for SCTP | |
480 | * 5.3.1.4 SCTP_SEND_FAILED | |
481 | * | |
482 | * ssf_length: sizeof (__u32) | |
483 | * This field is the total length of the notification data, including | |
484 | * the notification header. | |
485 | */ | |
486 | ssf->ssf_length = sizeof(struct sctp_send_failed) + len; | |
487 | skb_trim(skb, ssf->ssf_length); | |
488 | ||
489 | /* Socket Extensions for SCTP | |
490 | * 5.3.1.4 SCTP_SEND_FAILED | |
491 | * | |
492 | * ssf_error: 16 bits (unsigned integer) | |
493 | * This value represents the reason why the send failed, and if set, | |
494 | * will be a SCTP protocol error code as defined in [SCTP] section | |
495 | * 3.3.10. | |
496 | */ | |
497 | ssf->ssf_error = error; | |
498 | ||
499 | /* Socket Extensions for SCTP | |
500 | * 5.3.1.4 SCTP_SEND_FAILED | |
501 | * | |
502 | * ssf_info: sizeof (struct sctp_sndrcvinfo) | |
503 | * The original send information associated with the undelivered | |
504 | * message. | |
505 | */ | |
506 | memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo)); | |
507 | ||
508 | /* Per TSVWG discussion with Randy. Allow the application to | |
e9c54999 | 509 | * reassemble a fragmented message. |
1da177e4 LT |
510 | */ |
511 | ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags; | |
512 | ||
513 | /* Socket Extensions for SCTP | |
514 | * 5.3.1.4 SCTP_SEND_FAILED | |
515 | * | |
516 | * ssf_assoc_id: sizeof (sctp_assoc_t) | |
517 | * The association id field, sf_assoc_id, holds the identifier for the | |
518 | * association. All notifications for a given association have the | |
519 | * same association identifier. For TCP style socket, this field is | |
520 | * ignored. | |
521 | */ | |
522 | sctp_ulpevent_set_owner(event, asoc); | |
523 | ssf->ssf_assoc_id = sctp_assoc2id(asoc); | |
524 | return event; | |
525 | ||
526 | fail: | |
527 | return NULL; | |
528 | } | |
529 | ||
b6e6b5f1 XL |
530 | struct sctp_ulpevent *sctp_ulpevent_make_send_failed_event( |
531 | const struct sctp_association *asoc, struct sctp_chunk *chunk, | |
532 | __u16 flags, __u32 error, gfp_t gfp) | |
533 | { | |
534 | struct sctp_send_failed_event *ssf; | |
535 | struct sctp_ulpevent *event; | |
536 | struct sk_buff *skb; | |
537 | int len; | |
538 | ||
539 | skb = skb_copy_expand(chunk->skb, sizeof(*ssf), 0, gfp); | |
540 | if (!skb) | |
541 | return NULL; | |
542 | ||
543 | len = ntohs(chunk->chunk_hdr->length); | |
544 | len -= sctp_datachk_len(&asoc->stream); | |
545 | ||
546 | skb_pull(skb, sctp_datachk_len(&asoc->stream)); | |
547 | event = sctp_skb2event(skb); | |
548 | sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); | |
549 | ||
550 | ssf = skb_push(skb, sizeof(*ssf)); | |
551 | ssf->ssf_type = SCTP_SEND_FAILED_EVENT; | |
552 | ssf->ssf_flags = flags; | |
553 | ssf->ssf_length = sizeof(*ssf) + len; | |
554 | skb_trim(skb, ssf->ssf_length); | |
555 | ssf->ssf_error = error; | |
556 | ||
557 | ssf->ssfe_info.snd_sid = chunk->sinfo.sinfo_stream; | |
558 | ssf->ssfe_info.snd_ppid = chunk->sinfo.sinfo_ppid; | |
559 | ssf->ssfe_info.snd_context = chunk->sinfo.sinfo_context; | |
560 | ssf->ssfe_info.snd_assoc_id = chunk->sinfo.sinfo_assoc_id; | |
561 | ssf->ssfe_info.snd_flags = chunk->chunk_hdr->flags; | |
562 | ||
563 | sctp_ulpevent_set_owner(event, asoc); | |
564 | ssf->ssf_assoc_id = sctp_assoc2id(asoc); | |
565 | ||
566 | return event; | |
567 | } | |
568 | ||
1da177e4 LT |
569 | /* Create and initialize a SCTP_SHUTDOWN_EVENT notification. |
570 | * | |
571 | * Socket Extensions for SCTP - draft-01 | |
572 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
573 | */ | |
574 | struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event( | |
575 | const struct sctp_association *asoc, | |
dd0fc66f | 576 | __u16 flags, gfp_t gfp) |
1da177e4 LT |
577 | { |
578 | struct sctp_ulpevent *event; | |
579 | struct sctp_shutdown_event *sse; | |
580 | struct sk_buff *skb; | |
581 | ||
582 | event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event), | |
583 | MSG_NOTIFICATION, gfp); | |
584 | if (!event) | |
585 | goto fail; | |
586 | ||
587 | skb = sctp_event2skb(event); | |
4df864c1 | 588 | sse = skb_put(skb, sizeof(struct sctp_shutdown_event)); |
1da177e4 LT |
589 | |
590 | /* Socket Extensions for SCTP | |
591 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
592 | * | |
593 | * sse_type | |
594 | * It should be SCTP_SHUTDOWN_EVENT | |
595 | */ | |
596 | sse->sse_type = SCTP_SHUTDOWN_EVENT; | |
597 | ||
598 | /* Socket Extensions for SCTP | |
599 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
600 | * | |
601 | * sse_flags: 16 bits (unsigned integer) | |
602 | * Currently unused. | |
603 | */ | |
604 | sse->sse_flags = 0; | |
605 | ||
606 | /* Socket Extensions for SCTP | |
607 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
608 | * | |
609 | * sse_length: sizeof (__u32) | |
610 | * This field is the total length of the notification data, including | |
611 | * the notification header. | |
612 | */ | |
613 | sse->sse_length = sizeof(struct sctp_shutdown_event); | |
614 | ||
615 | /* Socket Extensions for SCTP | |
616 | * 5.3.1.5 SCTP_SHUTDOWN_EVENT | |
617 | * | |
618 | * sse_assoc_id: sizeof (sctp_assoc_t) | |
619 | * The association id field, holds the identifier for the association. | |
620 | * All notifications for a given association have the same association | |
621 | * identifier. For TCP style socket, this field is ignored. | |
622 | */ | |
623 | sctp_ulpevent_set_owner(event, asoc); | |
624 | sse->sse_assoc_id = sctp_assoc2id(asoc); | |
625 | ||
626 | return event; | |
627 | ||
628 | fail: | |
629 | return NULL; | |
630 | } | |
631 | ||
0f3fffd8 | 632 | /* Create and initialize a SCTP_ADAPTATION_INDICATION notification. |
1da177e4 LT |
633 | * |
634 | * Socket Extensions for SCTP | |
0f3fffd8 | 635 | * 5.3.1.6 SCTP_ADAPTATION_INDICATION |
1da177e4 | 636 | */ |
0f3fffd8 | 637 | struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication( |
dd0fc66f | 638 | const struct sctp_association *asoc, gfp_t gfp) |
1da177e4 LT |
639 | { |
640 | struct sctp_ulpevent *event; | |
0f3fffd8 | 641 | struct sctp_adaptation_event *sai; |
1da177e4 LT |
642 | struct sk_buff *skb; |
643 | ||
0f3fffd8 | 644 | event = sctp_ulpevent_new(sizeof(struct sctp_adaptation_event), |
1da177e4 LT |
645 | MSG_NOTIFICATION, gfp); |
646 | if (!event) | |
647 | goto fail; | |
648 | ||
649 | skb = sctp_event2skb(event); | |
4df864c1 | 650 | sai = skb_put(skb, sizeof(struct sctp_adaptation_event)); |
1da177e4 | 651 | |
0f3fffd8 | 652 | sai->sai_type = SCTP_ADAPTATION_INDICATION; |
1da177e4 | 653 | sai->sai_flags = 0; |
0f3fffd8 ISJ |
654 | sai->sai_length = sizeof(struct sctp_adaptation_event); |
655 | sai->sai_adaptation_ind = asoc->peer.adaptation_ind; | |
1da177e4 LT |
656 | sctp_ulpevent_set_owner(event, asoc); |
657 | sai->sai_assoc_id = sctp_assoc2id(asoc); | |
658 | ||
659 | return event; | |
660 | ||
661 | fail: | |
662 | return NULL; | |
663 | } | |
664 | ||
665 | /* A message has been received. Package this message as a notification | |
666 | * to pass it to the upper layers. Go ahead and calculate the sndrcvinfo | |
667 | * even if filtered out later. | |
668 | * | |
669 | * Socket Extensions for SCTP | |
670 | * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV) | |
671 | */ | |
672 | struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc, | |
673 | struct sctp_chunk *chunk, | |
dd0fc66f | 674 | gfp_t gfp) |
1da177e4 LT |
675 | { |
676 | struct sctp_ulpevent *event = NULL; | |
9dde27de XL |
677 | struct sk_buff *skb = chunk->skb; |
678 | struct sock *sk = asoc->base.sk; | |
679 | size_t padding, datalen; | |
4d93df0a NH |
680 | int rx_count; |
681 | ||
682 | /* | |
683 | * check to see if we need to make space for this | |
684 | * new skb, expand the rcvbuffer if needed, or drop | |
685 | * the frame | |
686 | */ | |
687 | if (asoc->ep->rcvbuf_policy) | |
688 | rx_count = atomic_read(&asoc->rmem_alloc); | |
689 | else | |
9dde27de | 690 | rx_count = atomic_read(&sk->sk_rmem_alloc); |
4d93df0a | 691 | |
9dde27de | 692 | datalen = ntohs(chunk->chunk_hdr->length); |
4d93df0a | 693 | |
9dde27de XL |
694 | if (rx_count >= sk->sk_rcvbuf || !sk_rmem_schedule(sk, skb, datalen)) |
695 | goto fail; | |
1da177e4 LT |
696 | |
697 | /* Clone the original skb, sharing the data. */ | |
698 | skb = skb_clone(chunk->skb, gfp); | |
699 | if (!skb) | |
700 | goto fail; | |
701 | ||
3888e9ef VY |
702 | /* Now that all memory allocations for this chunk succeeded, we |
703 | * can mark it as received so the tsn_map is updated correctly. | |
704 | */ | |
8e1ee18c | 705 | if (sctp_tsnmap_mark(&asoc->peer.tsn_map, |
4244854d NH |
706 | ntohl(chunk->subh.data_hdr->tsn), |
707 | chunk->transport)) | |
8e1ee18c | 708 | goto fail_mark; |
3888e9ef | 709 | |
1da177e4 LT |
710 | /* First calculate the padding, so we don't inadvertently |
711 | * pass up the wrong length to the user. | |
712 | * | |
713 | * RFC 2960 - Section 3.2 Chunk Field Descriptions | |
714 | * | |
715 | * The total length of a chunk(including Type, Length and Value fields) | |
716 | * MUST be a multiple of 4 bytes. If the length of the chunk is not a | |
717 | * multiple of 4 bytes, the sender MUST pad the chunk with all zero | |
718 | * bytes and this padding is not included in the chunk length field. | |
719 | * The sender should never pad with more than 3 bytes. The receiver | |
720 | * MUST ignore the padding bytes. | |
721 | */ | |
9dde27de | 722 | padding = SCTP_PAD4(datalen) - datalen; |
1da177e4 LT |
723 | |
724 | /* Fixup cloned skb with just this chunks data. */ | |
725 | skb_trim(skb, chunk->chunk_end - padding - skb->data); | |
726 | ||
727 | /* Embed the event fields inside the cloned skb. */ | |
728 | event = sctp_skb2event(skb); | |
729 | ||
331c4ee7 VY |
730 | /* Initialize event with flags 0 and correct length |
731 | * Since this is a clone of the original skb, only account for | |
732 | * the data of this chunk as other chunks will be accounted separately. | |
733 | */ | |
734 | sctp_ulpevent_init(event, 0, skb->len + sizeof(struct sk_buff)); | |
1da177e4 | 735 | |
1f45f78f MRL |
736 | /* And hold the chunk as we need it for getting the IP headers |
737 | * later in recvmsg | |
738 | */ | |
739 | sctp_chunk_hold(chunk); | |
740 | event->chunk = chunk; | |
741 | ||
1fe323aa XL |
742 | sctp_ulpevent_receive_data(event, asoc); |
743 | ||
1da177e4 | 744 | event->stream = ntohs(chunk->subh.data_hdr->stream); |
1da177e4 | 745 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { |
eaa5c54d | 746 | event->flags |= SCTP_UNORDERED; |
1da177e4 LT |
747 | event->cumtsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); |
748 | } | |
749 | event->tsn = ntohl(chunk->subh.data_hdr->tsn); | |
750 | event->msg_flags |= chunk->chunk_hdr->flags; | |
1da177e4 | 751 | |
1da177e4 | 752 | return event; |
8e1ee18c VY |
753 | |
754 | fail_mark: | |
755 | kfree_skb(skb); | |
756 | fail: | |
757 | return NULL; | |
1da177e4 LT |
758 | } |
759 | ||
760 | /* Create a partial delivery related event. | |
761 | * | |
762 | * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT | |
763 | * | |
764 | * When a receiver is engaged in a partial delivery of a | |
765 | * message this notification will be used to indicate | |
766 | * various events. | |
767 | */ | |
768 | struct sctp_ulpevent *sctp_ulpevent_make_pdapi( | |
65f5e357 XL |
769 | const struct sctp_association *asoc, |
770 | __u32 indication, __u32 sid, __u32 seq, | |
771 | __u32 flags, gfp_t gfp) | |
1da177e4 LT |
772 | { |
773 | struct sctp_ulpevent *event; | |
774 | struct sctp_pdapi_event *pd; | |
775 | struct sk_buff *skb; | |
776 | ||
777 | event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event), | |
778 | MSG_NOTIFICATION, gfp); | |
779 | if (!event) | |
780 | goto fail; | |
781 | ||
782 | skb = sctp_event2skb(event); | |
4df864c1 | 783 | pd = skb_put(skb, sizeof(struct sctp_pdapi_event)); |
1da177e4 LT |
784 | |
785 | /* pdapi_type | |
786 | * It should be SCTP_PARTIAL_DELIVERY_EVENT | |
787 | * | |
788 | * pdapi_flags: 16 bits (unsigned integer) | |
789 | * Currently unused. | |
790 | */ | |
791 | pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT; | |
65f5e357 XL |
792 | pd->pdapi_flags = flags; |
793 | pd->pdapi_stream = sid; | |
794 | pd->pdapi_seq = seq; | |
1da177e4 LT |
795 | |
796 | /* pdapi_length: 32 bits (unsigned integer) | |
797 | * | |
798 | * This field is the total length of the notification data, including | |
799 | * the notification header. It will generally be sizeof (struct | |
800 | * sctp_pdapi_event). | |
801 | */ | |
802 | pd->pdapi_length = sizeof(struct sctp_pdapi_event); | |
803 | ||
d808ad9a | 804 | /* pdapi_indication: 32 bits (unsigned integer) |
1da177e4 LT |
805 | * |
806 | * This field holds the indication being sent to the application. | |
807 | */ | |
808 | pd->pdapi_indication = indication; | |
809 | ||
810 | /* pdapi_assoc_id: sizeof (sctp_assoc_t) | |
811 | * | |
812 | * The association id field, holds the identifier for the association. | |
813 | */ | |
814 | sctp_ulpevent_set_owner(event, asoc); | |
815 | pd->pdapi_assoc_id = sctp_assoc2id(asoc); | |
816 | ||
817 | return event; | |
818 | fail: | |
819 | return NULL; | |
820 | } | |
821 | ||
65b07e5d VY |
822 | struct sctp_ulpevent *sctp_ulpevent_make_authkey( |
823 | const struct sctp_association *asoc, __u16 key_id, | |
824 | __u32 indication, gfp_t gfp) | |
825 | { | |
826 | struct sctp_ulpevent *event; | |
827 | struct sctp_authkey_event *ak; | |
828 | struct sk_buff *skb; | |
829 | ||
830 | event = sctp_ulpevent_new(sizeof(struct sctp_authkey_event), | |
831 | MSG_NOTIFICATION, gfp); | |
832 | if (!event) | |
833 | goto fail; | |
834 | ||
835 | skb = sctp_event2skb(event); | |
4df864c1 | 836 | ak = skb_put(skb, sizeof(struct sctp_authkey_event)); |
65b07e5d | 837 | |
ee916fd0 | 838 | ak->auth_type = SCTP_AUTHENTICATION_EVENT; |
65b07e5d VY |
839 | ak->auth_flags = 0; |
840 | ak->auth_length = sizeof(struct sctp_authkey_event); | |
841 | ||
842 | ak->auth_keynumber = key_id; | |
843 | ak->auth_altkeynumber = 0; | |
844 | ak->auth_indication = indication; | |
845 | ||
846 | /* | |
847 | * The association id field, holds the identifier for the association. | |
848 | */ | |
849 | sctp_ulpevent_set_owner(event, asoc); | |
850 | ak->auth_assoc_id = sctp_assoc2id(asoc); | |
851 | ||
852 | return event; | |
853 | fail: | |
854 | return NULL; | |
855 | } | |
856 | ||
e1cdd553 WY |
857 | /* |
858 | * Socket Extensions for SCTP | |
859 | * 6.3.10. SCTP_SENDER_DRY_EVENT | |
860 | */ | |
861 | struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event( | |
862 | const struct sctp_association *asoc, gfp_t gfp) | |
863 | { | |
864 | struct sctp_ulpevent *event; | |
865 | struct sctp_sender_dry_event *sdry; | |
866 | struct sk_buff *skb; | |
867 | ||
868 | event = sctp_ulpevent_new(sizeof(struct sctp_sender_dry_event), | |
869 | MSG_NOTIFICATION, gfp); | |
870 | if (!event) | |
871 | return NULL; | |
872 | ||
873 | skb = sctp_event2skb(event); | |
4df864c1 | 874 | sdry = skb_put(skb, sizeof(struct sctp_sender_dry_event)); |
e1cdd553 WY |
875 | |
876 | sdry->sender_dry_type = SCTP_SENDER_DRY_EVENT; | |
877 | sdry->sender_dry_flags = 0; | |
878 | sdry->sender_dry_length = sizeof(struct sctp_sender_dry_event); | |
879 | sctp_ulpevent_set_owner(event, asoc); | |
880 | sdry->sender_dry_assoc_id = sctp_assoc2id(asoc); | |
881 | ||
882 | return event; | |
883 | } | |
65b07e5d | 884 | |
35ea82d6 XL |
885 | struct sctp_ulpevent *sctp_ulpevent_make_stream_reset_event( |
886 | const struct sctp_association *asoc, __u16 flags, __u16 stream_num, | |
1da4fc97 | 887 | __be16 *stream_list, gfp_t gfp) |
35ea82d6 XL |
888 | { |
889 | struct sctp_stream_reset_event *sreset; | |
890 | struct sctp_ulpevent *event; | |
891 | struct sk_buff *skb; | |
892 | int length, i; | |
893 | ||
894 | length = sizeof(struct sctp_stream_reset_event) + 2 * stream_num; | |
895 | event = sctp_ulpevent_new(length, MSG_NOTIFICATION, gfp); | |
896 | if (!event) | |
897 | return NULL; | |
898 | ||
899 | skb = sctp_event2skb(event); | |
4df864c1 | 900 | sreset = skb_put(skb, length); |
35ea82d6 XL |
901 | |
902 | sreset->strreset_type = SCTP_STREAM_RESET_EVENT; | |
903 | sreset->strreset_flags = flags; | |
904 | sreset->strreset_length = length; | |
905 | sctp_ulpevent_set_owner(event, asoc); | |
906 | sreset->strreset_assoc_id = sctp_assoc2id(asoc); | |
907 | ||
908 | for (i = 0; i < stream_num; i++) | |
909 | sreset->strreset_stream_list[i] = ntohs(stream_list[i]); | |
910 | ||
911 | return event; | |
912 | } | |
913 | ||
c95129d1 XL |
914 | struct sctp_ulpevent *sctp_ulpevent_make_assoc_reset_event( |
915 | const struct sctp_association *asoc, __u16 flags, __u32 local_tsn, | |
916 | __u32 remote_tsn, gfp_t gfp) | |
917 | { | |
918 | struct sctp_assoc_reset_event *areset; | |
919 | struct sctp_ulpevent *event; | |
920 | struct sk_buff *skb; | |
921 | ||
922 | event = sctp_ulpevent_new(sizeof(struct sctp_assoc_reset_event), | |
923 | MSG_NOTIFICATION, gfp); | |
924 | if (!event) | |
925 | return NULL; | |
926 | ||
927 | skb = sctp_event2skb(event); | |
4df864c1 | 928 | areset = skb_put(skb, sizeof(struct sctp_assoc_reset_event)); |
c95129d1 XL |
929 | |
930 | areset->assocreset_type = SCTP_ASSOC_RESET_EVENT; | |
931 | areset->assocreset_flags = flags; | |
932 | areset->assocreset_length = sizeof(struct sctp_assoc_reset_event); | |
933 | sctp_ulpevent_set_owner(event, asoc); | |
934 | areset->assocreset_assoc_id = sctp_assoc2id(asoc); | |
935 | areset->assocreset_local_tsn = local_tsn; | |
936 | areset->assocreset_remote_tsn = remote_tsn; | |
937 | ||
938 | return event; | |
939 | } | |
940 | ||
b444153f XL |
941 | struct sctp_ulpevent *sctp_ulpevent_make_stream_change_event( |
942 | const struct sctp_association *asoc, __u16 flags, | |
943 | __u32 strchange_instrms, __u32 strchange_outstrms, gfp_t gfp) | |
944 | { | |
945 | struct sctp_stream_change_event *schange; | |
946 | struct sctp_ulpevent *event; | |
947 | struct sk_buff *skb; | |
948 | ||
949 | event = sctp_ulpevent_new(sizeof(struct sctp_stream_change_event), | |
950 | MSG_NOTIFICATION, gfp); | |
951 | if (!event) | |
952 | return NULL; | |
953 | ||
954 | skb = sctp_event2skb(event); | |
4df864c1 | 955 | schange = skb_put(skb, sizeof(struct sctp_stream_change_event)); |
b444153f XL |
956 | |
957 | schange->strchange_type = SCTP_STREAM_CHANGE_EVENT; | |
958 | schange->strchange_flags = flags; | |
959 | schange->strchange_length = sizeof(struct sctp_stream_change_event); | |
960 | sctp_ulpevent_set_owner(event, asoc); | |
961 | schange->strchange_assoc_id = sctp_assoc2id(asoc); | |
962 | schange->strchange_instrms = strchange_instrms; | |
963 | schange->strchange_outstrms = strchange_outstrms; | |
964 | ||
965 | return event; | |
966 | } | |
967 | ||
1da177e4 LT |
968 | /* Return the notification type, assuming this is a notification |
969 | * event. | |
970 | */ | |
971 | __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event) | |
972 | { | |
973 | union sctp_notification *notification; | |
974 | struct sk_buff *skb; | |
975 | ||
ab38fb04 | 976 | skb = sctp_event2skb(event); |
1da177e4 LT |
977 | notification = (union sctp_notification *) skb->data; |
978 | return notification->sn_header.sn_type; | |
979 | } | |
980 | ||
8f2e5ae4 DB |
981 | /* RFC6458, Section 5.3.2. SCTP Header Information Structure |
982 | * (SCTP_SNDRCV, DEPRECATED) | |
983 | */ | |
1da177e4 LT |
984 | void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event, |
985 | struct msghdr *msghdr) | |
986 | { | |
987 | struct sctp_sndrcvinfo sinfo; | |
988 | ||
989 | if (sctp_ulpevent_is_notification(event)) | |
990 | return; | |
991 | ||
8f2e5ae4 | 992 | memset(&sinfo, 0, sizeof(sinfo)); |
1da177e4 | 993 | sinfo.sinfo_stream = event->stream; |
1da177e4 | 994 | sinfo.sinfo_ssn = event->ssn; |
1da177e4 | 995 | sinfo.sinfo_ppid = event->ppid; |
1da177e4 | 996 | sinfo.sinfo_flags = event->flags; |
1da177e4 | 997 | sinfo.sinfo_tsn = event->tsn; |
1da177e4 | 998 | sinfo.sinfo_cumtsn = event->cumtsn; |
1da177e4 | 999 | sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc); |
8f2e5ae4 | 1000 | /* Context value that is set via SCTP_CONTEXT socket option. */ |
6ab792f5 | 1001 | sinfo.sinfo_context = event->asoc->default_rcv_context; |
1da177e4 | 1002 | /* These fields are not used while receiving. */ |
1da177e4 LT |
1003 | sinfo.sinfo_timetolive = 0; |
1004 | ||
1005 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV, | |
8f2e5ae4 | 1006 | sizeof(sinfo), &sinfo); |
1da177e4 LT |
1007 | } |
1008 | ||
0d3a421d GOV |
1009 | /* RFC6458, Section 5.3.5 SCTP Receive Information Structure |
1010 | * (SCTP_SNDRCV) | |
1011 | */ | |
1012 | void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event, | |
1013 | struct msghdr *msghdr) | |
1014 | { | |
1015 | struct sctp_rcvinfo rinfo; | |
1016 | ||
1017 | if (sctp_ulpevent_is_notification(event)) | |
1018 | return; | |
1019 | ||
1020 | memset(&rinfo, 0, sizeof(struct sctp_rcvinfo)); | |
1021 | rinfo.rcv_sid = event->stream; | |
1022 | rinfo.rcv_ssn = event->ssn; | |
1023 | rinfo.rcv_ppid = event->ppid; | |
1024 | rinfo.rcv_flags = event->flags; | |
1025 | rinfo.rcv_tsn = event->tsn; | |
1026 | rinfo.rcv_cumtsn = event->cumtsn; | |
1027 | rinfo.rcv_assoc_id = sctp_assoc2id(event->asoc); | |
1028 | rinfo.rcv_context = event->asoc->default_rcv_context; | |
1029 | ||
1030 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_RCVINFO, | |
1031 | sizeof(rinfo), &rinfo); | |
1032 | } | |
1033 | ||
2347c80f GOV |
1034 | /* RFC6458, Section 5.3.6. SCTP Next Receive Information Structure |
1035 | * (SCTP_NXTINFO) | |
1036 | */ | |
1037 | static void __sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event, | |
1038 | struct msghdr *msghdr, | |
1039 | const struct sk_buff *skb) | |
1040 | { | |
1041 | struct sctp_nxtinfo nxtinfo; | |
1042 | ||
1043 | memset(&nxtinfo, 0, sizeof(nxtinfo)); | |
1044 | nxtinfo.nxt_sid = event->stream; | |
1045 | nxtinfo.nxt_ppid = event->ppid; | |
1046 | nxtinfo.nxt_flags = event->flags; | |
1047 | if (sctp_ulpevent_is_notification(event)) | |
1048 | nxtinfo.nxt_flags |= SCTP_NOTIFICATION; | |
1049 | nxtinfo.nxt_length = skb->len; | |
1050 | nxtinfo.nxt_assoc_id = sctp_assoc2id(event->asoc); | |
1051 | ||
1052 | put_cmsg(msghdr, IPPROTO_SCTP, SCTP_NXTINFO, | |
1053 | sizeof(nxtinfo), &nxtinfo); | |
1054 | } | |
1055 | ||
1056 | void sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event, | |
1057 | struct msghdr *msghdr, | |
1058 | struct sock *sk) | |
1059 | { | |
1060 | struct sk_buff *skb; | |
1061 | int err; | |
1062 | ||
1063 | skb = sctp_skb_recv_datagram(sk, MSG_PEEK, 1, &err); | |
1064 | if (skb != NULL) { | |
1065 | __sctp_ulpevent_read_nxtinfo(sctp_skb2event(skb), | |
1066 | msghdr, skb); | |
1067 | /* Just release refcount here. */ | |
1068 | kfree_skb(skb); | |
1069 | } | |
1070 | } | |
1071 | ||
1da177e4 LT |
1072 | /* Do accounting for bytes received and hold a reference to the association |
1073 | * for each skb. | |
1074 | */ | |
1075 | static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, | |
1076 | struct sctp_association *asoc) | |
1077 | { | |
1078 | struct sk_buff *skb, *frag; | |
1079 | ||
1080 | skb = sctp_event2skb(event); | |
1081 | /* Set the owner and charge rwnd for bytes received. */ | |
1082 | sctp_ulpevent_set_owner(event, asoc); | |
362d5204 | 1083 | sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb)); |
1da177e4 LT |
1084 | |
1085 | if (!skb->data_len) | |
1086 | return; | |
1087 | ||
1088 | /* Note: Not clearing the entire event struct as this is just a | |
1089 | * fragment of the real event. However, we still need to do rwnd | |
1090 | * accounting. | |
1091 | * In general, the skb passed from IP can have only 1 level of | |
d808ad9a | 1092 | * fragments. But we allow multiple levels of fragments. |
1da177e4 | 1093 | */ |
1b003be3 | 1094 | skb_walk_frags(skb, frag) |
1da177e4 | 1095 | sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc); |
1da177e4 LT |
1096 | } |
1097 | ||
1098 | /* Do accounting for bytes just read by user and release the references to | |
1099 | * the association. | |
d808ad9a | 1100 | */ |
1da177e4 LT |
1101 | static void sctp_ulpevent_release_data(struct sctp_ulpevent *event) |
1102 | { | |
1103 | struct sk_buff *skb, *frag; | |
d7c2c9e3 | 1104 | unsigned int len; |
1da177e4 LT |
1105 | |
1106 | /* Current stack structures assume that the rcv buffer is | |
1107 | * per socket. For UDP style sockets this is not true as | |
1108 | * multiple associations may be on a single UDP-style socket. | |
1109 | * Use the local private area of the skb to track the owning | |
1110 | * association. | |
1111 | */ | |
1112 | ||
1113 | skb = sctp_event2skb(event); | |
d7c2c9e3 TF |
1114 | len = skb->len; |
1115 | ||
1116 | if (!skb->data_len) | |
1117 | goto done; | |
1118 | ||
1119 | /* Don't forget the fragments. */ | |
1b003be3 | 1120 | skb_walk_frags(skb, frag) { |
d7c2c9e3 TF |
1121 | /* NOTE: skb_shinfos are recursive. Although IP returns |
1122 | * skb's with only 1 level of fragments, SCTP reassembly can | |
1123 | * increase the levels. | |
1124 | */ | |
1125 | sctp_ulpevent_release_frag_data(sctp_skb2event(frag)); | |
1126 | } | |
1127 | ||
1128 | done: | |
362d5204 | 1129 | sctp_assoc_rwnd_increase(event->asoc, len); |
1f45f78f | 1130 | sctp_chunk_put(event->chunk); |
d7c2c9e3 TF |
1131 | sctp_ulpevent_release_owner(event); |
1132 | } | |
1133 | ||
1134 | static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event) | |
1135 | { | |
1136 | struct sk_buff *skb, *frag; | |
1137 | ||
1138 | skb = sctp_event2skb(event); | |
1da177e4 LT |
1139 | |
1140 | if (!skb->data_len) | |
1141 | goto done; | |
1142 | ||
1143 | /* Don't forget the fragments. */ | |
1b003be3 | 1144 | skb_walk_frags(skb, frag) { |
1da177e4 LT |
1145 | /* NOTE: skb_shinfos are recursive. Although IP returns |
1146 | * skb's with only 1 level of fragments, SCTP reassembly can | |
1147 | * increase the levels. | |
1148 | */ | |
d7c2c9e3 | 1149 | sctp_ulpevent_release_frag_data(sctp_skb2event(frag)); |
1da177e4 LT |
1150 | } |
1151 | ||
1152 | done: | |
1f45f78f | 1153 | sctp_chunk_put(event->chunk); |
1da177e4 LT |
1154 | sctp_ulpevent_release_owner(event); |
1155 | } | |
1156 | ||
1157 | /* Free a ulpevent that has an owner. It includes releasing the reference | |
1158 | * to the owner, updating the rwnd in case of a DATA event and freeing the | |
1159 | * skb. | |
1da177e4 LT |
1160 | */ |
1161 | void sctp_ulpevent_free(struct sctp_ulpevent *event) | |
1162 | { | |
1163 | if (sctp_ulpevent_is_notification(event)) | |
1164 | sctp_ulpevent_release_owner(event); | |
1165 | else | |
1166 | sctp_ulpevent_release_data(event); | |
1167 | ||
1168 | kfree_skb(sctp_event2skb(event)); | |
1169 | } | |
1170 | ||
1171 | /* Purge the skb lists holding ulpevents. */ | |
cd4fcc70 | 1172 | unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list) |
1da177e4 LT |
1173 | { |
1174 | struct sk_buff *skb; | |
cd4fcc70 TG |
1175 | unsigned int data_unread = 0; |
1176 | ||
1177 | while ((skb = skb_dequeue(list)) != NULL) { | |
1178 | struct sctp_ulpevent *event = sctp_skb2event(skb); | |
1179 | ||
1180 | if (!sctp_ulpevent_is_notification(event)) | |
1181 | data_unread += skb->len; | |
1182 | ||
1183 | sctp_ulpevent_free(event); | |
1184 | } | |
1185 | ||
1186 | return data_unread; | |
1da177e4 | 1187 | } |