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47505b8b | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
0c3f6f65 XL |
2 | /* SCTP kernel implementation |
3 | * (C) Copyright Red Hat Inc. 2017 | |
4 | * | |
5 | * This file is part of the SCTP kernel implementation | |
6 | * | |
fae8b6f4 XL |
7 | * These functions implement sctp stream message interleaving, mostly |
8 | * including I-DATA and I-FORWARD-TSN chunks process. | |
0c3f6f65 | 9 | * |
0c3f6f65 XL |
10 | * Please send any bug reports or fixes you make to the |
11 | * email addresched(es): | |
12 | * lksctp developers <linux-sctp@vger.kernel.org> | |
13 | * | |
14 | * Written or modified by: | |
15 | * Xin Long <lucien.xin@gmail.com> | |
16 | */ | |
17 | ||
bd4d627d | 18 | #include <net/busy_poll.h> |
0c3f6f65 XL |
19 | #include <net/sctp/sctp.h> |
20 | #include <net/sctp/sm.h> | |
bd4d627d | 21 | #include <net/sctp/ulpevent.h> |
0c3f6f65 XL |
22 | #include <linux/sctp.h> |
23 | ||
24 | static struct sctp_chunk *sctp_make_idatafrag_empty( | |
25 | const struct sctp_association *asoc, | |
26 | const struct sctp_sndrcvinfo *sinfo, | |
27 | int len, __u8 flags, gfp_t gfp) | |
28 | { | |
29 | struct sctp_chunk *retval; | |
30 | struct sctp_idatahdr dp; | |
31 | ||
32 | memset(&dp, 0, sizeof(dp)); | |
33 | dp.stream = htons(sinfo->sinfo_stream); | |
34 | ||
35 | if (sinfo->sinfo_flags & SCTP_UNORDERED) | |
36 | flags |= SCTP_DATA_UNORDERED; | |
37 | ||
38 | retval = sctp_make_idata(asoc, flags, sizeof(dp) + len, gfp); | |
39 | if (!retval) | |
40 | return NULL; | |
41 | ||
42 | retval->subh.idata_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); | |
43 | memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); | |
44 | ||
45 | return retval; | |
46 | } | |
47 | ||
668c9beb XL |
48 | static void sctp_chunk_assign_mid(struct sctp_chunk *chunk) |
49 | { | |
50 | struct sctp_stream *stream; | |
51 | struct sctp_chunk *lchunk; | |
52 | __u32 cfsn = 0; | |
53 | __u16 sid; | |
54 | ||
55 | if (chunk->has_mid) | |
56 | return; | |
57 | ||
58 | sid = sctp_chunk_stream_no(chunk); | |
59 | stream = &chunk->asoc->stream; | |
60 | ||
61 | list_for_each_entry(lchunk, &chunk->msg->chunks, frag_list) { | |
62 | struct sctp_idatahdr *hdr; | |
13228238 | 63 | __u32 mid; |
668c9beb XL |
64 | |
65 | lchunk->has_mid = 1; | |
66 | ||
668c9beb XL |
67 | hdr = lchunk->subh.idata_hdr; |
68 | ||
69 | if (lchunk->chunk_hdr->flags & SCTP_DATA_FIRST_FRAG) | |
70 | hdr->ppid = lchunk->sinfo.sinfo_ppid; | |
71 | else | |
72 | hdr->fsn = htonl(cfsn++); | |
73 | ||
13228238 XL |
74 | if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { |
75 | mid = lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG ? | |
76 | sctp_mid_uo_next(stream, out, sid) : | |
77 | sctp_mid_uo_peek(stream, out, sid); | |
78 | } else { | |
79 | mid = lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG ? | |
80 | sctp_mid_next(stream, out, sid) : | |
81 | sctp_mid_peek(stream, out, sid); | |
82 | } | |
83 | hdr->mid = htonl(mid); | |
668c9beb XL |
84 | } |
85 | } | |
86 | ||
9d4ceaf1 XL |
87 | static bool sctp_validate_data(struct sctp_chunk *chunk) |
88 | { | |
2075e50c | 89 | struct sctp_stream *stream; |
9d4ceaf1 XL |
90 | __u16 sid, ssn; |
91 | ||
92 | if (chunk->chunk_hdr->type != SCTP_CID_DATA) | |
93 | return false; | |
94 | ||
95 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) | |
96 | return true; | |
97 | ||
98 | stream = &chunk->asoc->stream; | |
99 | sid = sctp_chunk_stream_no(chunk); | |
100 | ssn = ntohs(chunk->subh.data_hdr->ssn); | |
101 | ||
102 | return !SSN_lt(ssn, sctp_ssn_peek(stream, in, sid)); | |
103 | } | |
104 | ||
105 | static bool sctp_validate_idata(struct sctp_chunk *chunk) | |
106 | { | |
107 | struct sctp_stream *stream; | |
108 | __u32 mid; | |
109 | __u16 sid; | |
110 | ||
111 | if (chunk->chunk_hdr->type != SCTP_CID_I_DATA) | |
112 | return false; | |
113 | ||
114 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) | |
115 | return true; | |
116 | ||
117 | stream = &chunk->asoc->stream; | |
118 | sid = sctp_chunk_stream_no(chunk); | |
119 | mid = ntohl(chunk->subh.idata_hdr->mid); | |
120 | ||
121 | return !MID_lt(mid, sctp_mid_peek(stream, in, sid)); | |
122 | } | |
123 | ||
bd4d627d XL |
124 | static void sctp_intl_store_reasm(struct sctp_ulpq *ulpq, |
125 | struct sctp_ulpevent *event) | |
126 | { | |
127 | struct sctp_ulpevent *cevent; | |
348bbc25 | 128 | struct sk_buff *pos, *loc; |
bd4d627d XL |
129 | |
130 | pos = skb_peek_tail(&ulpq->reasm); | |
131 | if (!pos) { | |
132 | __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event)); | |
133 | return; | |
134 | } | |
135 | ||
136 | cevent = sctp_skb2event(pos); | |
137 | ||
138 | if (event->stream == cevent->stream && | |
139 | event->mid == cevent->mid && | |
140 | (cevent->msg_flags & SCTP_DATA_FIRST_FRAG || | |
141 | (!(event->msg_flags & SCTP_DATA_FIRST_FRAG) && | |
142 | event->fsn > cevent->fsn))) { | |
143 | __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event)); | |
144 | return; | |
145 | } | |
146 | ||
147 | if ((event->stream == cevent->stream && | |
148 | MID_lt(cevent->mid, event->mid)) || | |
149 | event->stream > cevent->stream) { | |
150 | __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event)); | |
151 | return; | |
152 | } | |
153 | ||
348bbc25 | 154 | loc = NULL; |
bd4d627d XL |
155 | skb_queue_walk(&ulpq->reasm, pos) { |
156 | cevent = sctp_skb2event(pos); | |
157 | ||
158 | if (event->stream < cevent->stream || | |
159 | (event->stream == cevent->stream && | |
348bbc25 DM |
160 | MID_lt(event->mid, cevent->mid))) { |
161 | loc = pos; | |
bd4d627d | 162 | break; |
348bbc25 | 163 | } |
bd4d627d XL |
164 | if (event->stream == cevent->stream && |
165 | event->mid == cevent->mid && | |
166 | !(cevent->msg_flags & SCTP_DATA_FIRST_FRAG) && | |
167 | (event->msg_flags & SCTP_DATA_FIRST_FRAG || | |
348bbc25 DM |
168 | event->fsn < cevent->fsn)) { |
169 | loc = pos; | |
bd4d627d | 170 | break; |
348bbc25 | 171 | } |
bd4d627d XL |
172 | } |
173 | ||
348bbc25 DM |
174 | if (!loc) |
175 | __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event)); | |
176 | else | |
177 | __skb_queue_before(&ulpq->reasm, loc, sctp_event2skb(event)); | |
bd4d627d XL |
178 | } |
179 | ||
180 | static struct sctp_ulpevent *sctp_intl_retrieve_partial( | |
181 | struct sctp_ulpq *ulpq, | |
182 | struct sctp_ulpevent *event) | |
183 | { | |
184 | struct sk_buff *first_frag = NULL; | |
185 | struct sk_buff *last_frag = NULL; | |
186 | struct sctp_ulpevent *retval; | |
187 | struct sctp_stream_in *sin; | |
188 | struct sk_buff *pos; | |
189 | __u32 next_fsn = 0; | |
190 | int is_last = 0; | |
191 | ||
05364ca0 | 192 | sin = sctp_stream_in(&ulpq->asoc->stream, event->stream); |
bd4d627d XL |
193 | |
194 | skb_queue_walk(&ulpq->reasm, pos) { | |
195 | struct sctp_ulpevent *cevent = sctp_skb2event(pos); | |
196 | ||
197 | if (cevent->stream < event->stream) | |
198 | continue; | |
199 | ||
200 | if (cevent->stream > event->stream || | |
201 | cevent->mid != sin->mid) | |
202 | break; | |
203 | ||
204 | switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) { | |
205 | case SCTP_DATA_FIRST_FRAG: | |
206 | goto out; | |
207 | case SCTP_DATA_MIDDLE_FRAG: | |
208 | if (!first_frag) { | |
209 | if (cevent->fsn == sin->fsn) { | |
210 | first_frag = pos; | |
211 | last_frag = pos; | |
212 | next_fsn = cevent->fsn + 1; | |
213 | } | |
214 | } else if (cevent->fsn == next_fsn) { | |
215 | last_frag = pos; | |
216 | next_fsn++; | |
217 | } else { | |
218 | goto out; | |
219 | } | |
220 | break; | |
221 | case SCTP_DATA_LAST_FRAG: | |
222 | if (!first_frag) { | |
223 | if (cevent->fsn == sin->fsn) { | |
224 | first_frag = pos; | |
225 | last_frag = pos; | |
226 | next_fsn = 0; | |
227 | is_last = 1; | |
228 | } | |
229 | } else if (cevent->fsn == next_fsn) { | |
230 | last_frag = pos; | |
231 | next_fsn = 0; | |
232 | is_last = 1; | |
233 | } | |
234 | goto out; | |
235 | default: | |
236 | goto out; | |
237 | } | |
238 | } | |
239 | ||
240 | out: | |
241 | if (!first_frag) | |
242 | return NULL; | |
243 | ||
244 | retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk), | |
245 | &ulpq->reasm, first_frag, | |
246 | last_frag); | |
247 | if (retval) { | |
248 | sin->fsn = next_fsn; | |
249 | if (is_last) { | |
250 | retval->msg_flags |= MSG_EOR; | |
251 | sin->pd_mode = 0; | |
252 | } | |
253 | } | |
254 | ||
255 | return retval; | |
256 | } | |
257 | ||
258 | static struct sctp_ulpevent *sctp_intl_retrieve_reassembled( | |
259 | struct sctp_ulpq *ulpq, | |
260 | struct sctp_ulpevent *event) | |
261 | { | |
262 | struct sctp_association *asoc = ulpq->asoc; | |
263 | struct sk_buff *pos, *first_frag = NULL; | |
264 | struct sctp_ulpevent *retval = NULL; | |
265 | struct sk_buff *pd_first = NULL; | |
266 | struct sk_buff *pd_last = NULL; | |
267 | struct sctp_stream_in *sin; | |
268 | __u32 next_fsn = 0; | |
269 | __u32 pd_point = 0; | |
270 | __u32 pd_len = 0; | |
271 | __u32 mid = 0; | |
272 | ||
05364ca0 | 273 | sin = sctp_stream_in(&ulpq->asoc->stream, event->stream); |
bd4d627d XL |
274 | |
275 | skb_queue_walk(&ulpq->reasm, pos) { | |
276 | struct sctp_ulpevent *cevent = sctp_skb2event(pos); | |
277 | ||
278 | if (cevent->stream < event->stream) | |
279 | continue; | |
280 | if (cevent->stream > event->stream) | |
281 | break; | |
282 | ||
283 | if (MID_lt(cevent->mid, event->mid)) | |
284 | continue; | |
285 | if (MID_lt(event->mid, cevent->mid)) | |
286 | break; | |
287 | ||
288 | switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) { | |
289 | case SCTP_DATA_FIRST_FRAG: | |
290 | if (cevent->mid == sin->mid) { | |
291 | pd_first = pos; | |
292 | pd_last = pos; | |
293 | pd_len = pos->len; | |
294 | } | |
295 | ||
296 | first_frag = pos; | |
297 | next_fsn = 0; | |
298 | mid = cevent->mid; | |
299 | break; | |
300 | ||
301 | case SCTP_DATA_MIDDLE_FRAG: | |
302 | if (first_frag && cevent->mid == mid && | |
303 | cevent->fsn == next_fsn) { | |
304 | next_fsn++; | |
305 | if (pd_first) { | |
306 | pd_last = pos; | |
307 | pd_len += pos->len; | |
308 | } | |
309 | } else { | |
310 | first_frag = NULL; | |
311 | } | |
312 | break; | |
313 | ||
314 | case SCTP_DATA_LAST_FRAG: | |
315 | if (first_frag && cevent->mid == mid && | |
316 | cevent->fsn == next_fsn) | |
317 | goto found; | |
318 | else | |
319 | first_frag = NULL; | |
320 | break; | |
321 | } | |
322 | } | |
323 | ||
324 | if (!pd_first) | |
325 | goto out; | |
326 | ||
327 | pd_point = sctp_sk(asoc->base.sk)->pd_point; | |
328 | if (pd_point && pd_point <= pd_len) { | |
329 | retval = sctp_make_reassembled_event(sock_net(asoc->base.sk), | |
330 | &ulpq->reasm, | |
331 | pd_first, pd_last); | |
332 | if (retval) { | |
333 | sin->fsn = next_fsn; | |
334 | sin->pd_mode = 1; | |
335 | } | |
336 | } | |
337 | goto out; | |
338 | ||
339 | found: | |
340 | retval = sctp_make_reassembled_event(sock_net(asoc->base.sk), | |
341 | &ulpq->reasm, | |
342 | first_frag, pos); | |
343 | if (retval) | |
344 | retval->msg_flags |= MSG_EOR; | |
345 | ||
346 | out: | |
347 | return retval; | |
348 | } | |
349 | ||
350 | static struct sctp_ulpevent *sctp_intl_reasm(struct sctp_ulpq *ulpq, | |
351 | struct sctp_ulpevent *event) | |
352 | { | |
353 | struct sctp_ulpevent *retval = NULL; | |
354 | struct sctp_stream_in *sin; | |
355 | ||
356 | if (SCTP_DATA_NOT_FRAG == (event->msg_flags & SCTP_DATA_FRAG_MASK)) { | |
357 | event->msg_flags |= MSG_EOR; | |
358 | return event; | |
359 | } | |
360 | ||
361 | sctp_intl_store_reasm(ulpq, event); | |
362 | ||
05364ca0 | 363 | sin = sctp_stream_in(&ulpq->asoc->stream, event->stream); |
bd4d627d XL |
364 | if (sin->pd_mode && event->mid == sin->mid && |
365 | event->fsn == sin->fsn) | |
366 | retval = sctp_intl_retrieve_partial(ulpq, event); | |
367 | ||
368 | if (!retval) | |
369 | retval = sctp_intl_retrieve_reassembled(ulpq, event); | |
370 | ||
371 | return retval; | |
372 | } | |
373 | ||
374 | static void sctp_intl_store_ordered(struct sctp_ulpq *ulpq, | |
375 | struct sctp_ulpevent *event) | |
376 | { | |
377 | struct sctp_ulpevent *cevent; | |
e15e067d | 378 | struct sk_buff *pos, *loc; |
bd4d627d XL |
379 | |
380 | pos = skb_peek_tail(&ulpq->lobby); | |
381 | if (!pos) { | |
382 | __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event)); | |
383 | return; | |
384 | } | |
385 | ||
386 | cevent = (struct sctp_ulpevent *)pos->cb; | |
387 | if (event->stream == cevent->stream && | |
388 | MID_lt(cevent->mid, event->mid)) { | |
389 | __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event)); | |
390 | return; | |
391 | } | |
392 | ||
393 | if (event->stream > cevent->stream) { | |
394 | __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event)); | |
395 | return; | |
396 | } | |
397 | ||
e15e067d | 398 | loc = NULL; |
bd4d627d XL |
399 | skb_queue_walk(&ulpq->lobby, pos) { |
400 | cevent = (struct sctp_ulpevent *)pos->cb; | |
401 | ||
e15e067d DM |
402 | if (cevent->stream > event->stream) { |
403 | loc = pos; | |
bd4d627d | 404 | break; |
e15e067d | 405 | } |
bd4d627d | 406 | if (cevent->stream == event->stream && |
e15e067d DM |
407 | MID_lt(event->mid, cevent->mid)) { |
408 | loc = pos; | |
bd4d627d | 409 | break; |
e15e067d | 410 | } |
bd4d627d XL |
411 | } |
412 | ||
e15e067d DM |
413 | if (!loc) |
414 | __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event)); | |
415 | else | |
416 | __skb_queue_before(&ulpq->lobby, loc, sctp_event2skb(event)); | |
bd4d627d XL |
417 | } |
418 | ||
419 | static void sctp_intl_retrieve_ordered(struct sctp_ulpq *ulpq, | |
420 | struct sctp_ulpevent *event) | |
421 | { | |
422 | struct sk_buff_head *event_list; | |
423 | struct sctp_stream *stream; | |
424 | struct sk_buff *pos, *tmp; | |
425 | __u16 sid = event->stream; | |
426 | ||
427 | stream = &ulpq->asoc->stream; | |
428 | event_list = (struct sk_buff_head *)sctp_event2skb(event)->prev; | |
429 | ||
430 | sctp_skb_for_each(pos, &ulpq->lobby, tmp) { | |
431 | struct sctp_ulpevent *cevent = (struct sctp_ulpevent *)pos->cb; | |
432 | ||
433 | if (cevent->stream > sid) | |
434 | break; | |
435 | ||
436 | if (cevent->stream < sid) | |
437 | continue; | |
438 | ||
439 | if (cevent->mid != sctp_mid_peek(stream, in, sid)) | |
440 | break; | |
441 | ||
442 | sctp_mid_next(stream, in, sid); | |
443 | ||
444 | __skb_unlink(pos, &ulpq->lobby); | |
445 | ||
446 | __skb_queue_tail(event_list, pos); | |
447 | } | |
448 | } | |
449 | ||
450 | static struct sctp_ulpevent *sctp_intl_order(struct sctp_ulpq *ulpq, | |
451 | struct sctp_ulpevent *event) | |
452 | { | |
453 | struct sctp_stream *stream; | |
454 | __u16 sid; | |
455 | ||
bd4d627d XL |
456 | stream = &ulpq->asoc->stream; |
457 | sid = event->stream; | |
458 | ||
459 | if (event->mid != sctp_mid_peek(stream, in, sid)) { | |
460 | sctp_intl_store_ordered(ulpq, event); | |
461 | return NULL; | |
462 | } | |
463 | ||
464 | sctp_mid_next(stream, in, sid); | |
465 | ||
466 | sctp_intl_retrieve_ordered(ulpq, event); | |
467 | ||
468 | return event; | |
469 | } | |
470 | ||
471 | static int sctp_enqueue_event(struct sctp_ulpq *ulpq, | |
178ca044 | 472 | struct sk_buff_head *skb_list) |
bd4d627d | 473 | { |
bd4d627d XL |
474 | struct sock *sk = ulpq->asoc->base.sk; |
475 | struct sctp_sock *sp = sctp_sk(sk); | |
178ca044 DM |
476 | struct sctp_ulpevent *event; |
477 | struct sk_buff *skb; | |
bd4d627d | 478 | |
178ca044 DM |
479 | skb = __skb_peek(skb_list); |
480 | event = sctp_skb2event(skb); | |
bd4d627d XL |
481 | |
482 | if (sk->sk_shutdown & RCV_SHUTDOWN && | |
483 | (sk->sk_shutdown & SEND_SHUTDOWN || | |
484 | !sctp_ulpevent_is_notification(event))) | |
485 | goto out_free; | |
486 | ||
487 | if (!sctp_ulpevent_is_notification(event)) { | |
488 | sk_mark_napi_id(sk, skb); | |
489 | sk_incoming_cpu_update(sk); | |
490 | } | |
491 | ||
a1e3a059 | 492 | if (!sctp_ulpevent_is_enabled(event, ulpq->asoc->subscribe)) |
bd4d627d XL |
493 | goto out_free; |
494 | ||
495 | if (skb_list) | |
496 | skb_queue_splice_tail_init(skb_list, | |
497 | &sk->sk_receive_queue); | |
498 | else | |
499 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
500 | ||
501 | if (!sp->data_ready_signalled) { | |
502 | sp->data_ready_signalled = 1; | |
503 | sk->sk_data_ready(sk); | |
504 | } | |
505 | ||
506 | return 1; | |
507 | ||
508 | out_free: | |
509 | if (skb_list) | |
510 | sctp_queue_purge_ulpevents(skb_list); | |
511 | else | |
512 | sctp_ulpevent_free(event); | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
13228238 XL |
517 | static void sctp_intl_store_reasm_uo(struct sctp_ulpq *ulpq, |
518 | struct sctp_ulpevent *event) | |
519 | { | |
520 | struct sctp_ulpevent *cevent; | |
521 | struct sk_buff *pos; | |
522 | ||
523 | pos = skb_peek_tail(&ulpq->reasm_uo); | |
524 | if (!pos) { | |
525 | __skb_queue_tail(&ulpq->reasm_uo, sctp_event2skb(event)); | |
526 | return; | |
527 | } | |
528 | ||
529 | cevent = sctp_skb2event(pos); | |
530 | ||
531 | if (event->stream == cevent->stream && | |
532 | event->mid == cevent->mid && | |
533 | (cevent->msg_flags & SCTP_DATA_FIRST_FRAG || | |
534 | (!(event->msg_flags & SCTP_DATA_FIRST_FRAG) && | |
535 | event->fsn > cevent->fsn))) { | |
536 | __skb_queue_tail(&ulpq->reasm_uo, sctp_event2skb(event)); | |
537 | return; | |
538 | } | |
539 | ||
540 | if ((event->stream == cevent->stream && | |
541 | MID_lt(cevent->mid, event->mid)) || | |
542 | event->stream > cevent->stream) { | |
543 | __skb_queue_tail(&ulpq->reasm_uo, sctp_event2skb(event)); | |
544 | return; | |
545 | } | |
546 | ||
547 | skb_queue_walk(&ulpq->reasm_uo, pos) { | |
548 | cevent = sctp_skb2event(pos); | |
549 | ||
550 | if (event->stream < cevent->stream || | |
551 | (event->stream == cevent->stream && | |
552 | MID_lt(event->mid, cevent->mid))) | |
553 | break; | |
554 | ||
555 | if (event->stream == cevent->stream && | |
556 | event->mid == cevent->mid && | |
557 | !(cevent->msg_flags & SCTP_DATA_FIRST_FRAG) && | |
558 | (event->msg_flags & SCTP_DATA_FIRST_FRAG || | |
559 | event->fsn < cevent->fsn)) | |
560 | break; | |
561 | } | |
562 | ||
563 | __skb_queue_before(&ulpq->reasm_uo, pos, sctp_event2skb(event)); | |
564 | } | |
565 | ||
566 | static struct sctp_ulpevent *sctp_intl_retrieve_partial_uo( | |
567 | struct sctp_ulpq *ulpq, | |
568 | struct sctp_ulpevent *event) | |
569 | { | |
570 | struct sk_buff *first_frag = NULL; | |
571 | struct sk_buff *last_frag = NULL; | |
572 | struct sctp_ulpevent *retval; | |
573 | struct sctp_stream_in *sin; | |
574 | struct sk_buff *pos; | |
575 | __u32 next_fsn = 0; | |
576 | int is_last = 0; | |
577 | ||
05364ca0 | 578 | sin = sctp_stream_in(&ulpq->asoc->stream, event->stream); |
13228238 XL |
579 | |
580 | skb_queue_walk(&ulpq->reasm_uo, pos) { | |
581 | struct sctp_ulpevent *cevent = sctp_skb2event(pos); | |
582 | ||
583 | if (cevent->stream < event->stream) | |
584 | continue; | |
585 | if (cevent->stream > event->stream) | |
586 | break; | |
587 | ||
588 | if (MID_lt(cevent->mid, sin->mid_uo)) | |
589 | continue; | |
590 | if (MID_lt(sin->mid_uo, cevent->mid)) | |
591 | break; | |
592 | ||
593 | switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) { | |
594 | case SCTP_DATA_FIRST_FRAG: | |
595 | goto out; | |
596 | case SCTP_DATA_MIDDLE_FRAG: | |
597 | if (!first_frag) { | |
598 | if (cevent->fsn == sin->fsn_uo) { | |
599 | first_frag = pos; | |
600 | last_frag = pos; | |
601 | next_fsn = cevent->fsn + 1; | |
602 | } | |
603 | } else if (cevent->fsn == next_fsn) { | |
604 | last_frag = pos; | |
605 | next_fsn++; | |
606 | } else { | |
607 | goto out; | |
608 | } | |
609 | break; | |
610 | case SCTP_DATA_LAST_FRAG: | |
611 | if (!first_frag) { | |
612 | if (cevent->fsn == sin->fsn_uo) { | |
613 | first_frag = pos; | |
614 | last_frag = pos; | |
615 | next_fsn = 0; | |
616 | is_last = 1; | |
617 | } | |
618 | } else if (cevent->fsn == next_fsn) { | |
619 | last_frag = pos; | |
620 | next_fsn = 0; | |
621 | is_last = 1; | |
622 | } | |
623 | goto out; | |
624 | default: | |
625 | goto out; | |
626 | } | |
627 | } | |
628 | ||
629 | out: | |
630 | if (!first_frag) | |
631 | return NULL; | |
632 | ||
633 | retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk), | |
634 | &ulpq->reasm_uo, first_frag, | |
635 | last_frag); | |
636 | if (retval) { | |
637 | sin->fsn_uo = next_fsn; | |
638 | if (is_last) { | |
639 | retval->msg_flags |= MSG_EOR; | |
640 | sin->pd_mode_uo = 0; | |
641 | } | |
642 | } | |
643 | ||
644 | return retval; | |
645 | } | |
646 | ||
647 | static struct sctp_ulpevent *sctp_intl_retrieve_reassembled_uo( | |
648 | struct sctp_ulpq *ulpq, | |
649 | struct sctp_ulpevent *event) | |
650 | { | |
651 | struct sctp_association *asoc = ulpq->asoc; | |
652 | struct sk_buff *pos, *first_frag = NULL; | |
653 | struct sctp_ulpevent *retval = NULL; | |
654 | struct sk_buff *pd_first = NULL; | |
655 | struct sk_buff *pd_last = NULL; | |
656 | struct sctp_stream_in *sin; | |
657 | __u32 next_fsn = 0; | |
658 | __u32 pd_point = 0; | |
659 | __u32 pd_len = 0; | |
660 | __u32 mid = 0; | |
661 | ||
05364ca0 | 662 | sin = sctp_stream_in(&ulpq->asoc->stream, event->stream); |
13228238 XL |
663 | |
664 | skb_queue_walk(&ulpq->reasm_uo, pos) { | |
665 | struct sctp_ulpevent *cevent = sctp_skb2event(pos); | |
666 | ||
667 | if (cevent->stream < event->stream) | |
668 | continue; | |
669 | if (cevent->stream > event->stream) | |
670 | break; | |
671 | ||
672 | if (MID_lt(cevent->mid, event->mid)) | |
673 | continue; | |
674 | if (MID_lt(event->mid, cevent->mid)) | |
675 | break; | |
676 | ||
677 | switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) { | |
678 | case SCTP_DATA_FIRST_FRAG: | |
679 | if (!sin->pd_mode_uo) { | |
680 | sin->mid_uo = cevent->mid; | |
681 | pd_first = pos; | |
682 | pd_last = pos; | |
683 | pd_len = pos->len; | |
684 | } | |
685 | ||
686 | first_frag = pos; | |
687 | next_fsn = 0; | |
688 | mid = cevent->mid; | |
689 | break; | |
690 | ||
691 | case SCTP_DATA_MIDDLE_FRAG: | |
692 | if (first_frag && cevent->mid == mid && | |
693 | cevent->fsn == next_fsn) { | |
694 | next_fsn++; | |
695 | if (pd_first) { | |
696 | pd_last = pos; | |
697 | pd_len += pos->len; | |
698 | } | |
699 | } else { | |
700 | first_frag = NULL; | |
701 | } | |
702 | break; | |
703 | ||
704 | case SCTP_DATA_LAST_FRAG: | |
705 | if (first_frag && cevent->mid == mid && | |
706 | cevent->fsn == next_fsn) | |
707 | goto found; | |
708 | else | |
709 | first_frag = NULL; | |
710 | break; | |
711 | } | |
712 | } | |
713 | ||
714 | if (!pd_first) | |
715 | goto out; | |
716 | ||
717 | pd_point = sctp_sk(asoc->base.sk)->pd_point; | |
718 | if (pd_point && pd_point <= pd_len) { | |
719 | retval = sctp_make_reassembled_event(sock_net(asoc->base.sk), | |
720 | &ulpq->reasm_uo, | |
721 | pd_first, pd_last); | |
722 | if (retval) { | |
723 | sin->fsn_uo = next_fsn; | |
724 | sin->pd_mode_uo = 1; | |
725 | } | |
726 | } | |
727 | goto out; | |
728 | ||
729 | found: | |
730 | retval = sctp_make_reassembled_event(sock_net(asoc->base.sk), | |
731 | &ulpq->reasm_uo, | |
732 | first_frag, pos); | |
733 | if (retval) | |
734 | retval->msg_flags |= MSG_EOR; | |
735 | ||
736 | out: | |
737 | return retval; | |
738 | } | |
739 | ||
740 | static struct sctp_ulpevent *sctp_intl_reasm_uo(struct sctp_ulpq *ulpq, | |
741 | struct sctp_ulpevent *event) | |
742 | { | |
743 | struct sctp_ulpevent *retval = NULL; | |
744 | struct sctp_stream_in *sin; | |
745 | ||
746 | if (SCTP_DATA_NOT_FRAG == (event->msg_flags & SCTP_DATA_FRAG_MASK)) { | |
747 | event->msg_flags |= MSG_EOR; | |
748 | return event; | |
749 | } | |
750 | ||
751 | sctp_intl_store_reasm_uo(ulpq, event); | |
752 | ||
05364ca0 | 753 | sin = sctp_stream_in(&ulpq->asoc->stream, event->stream); |
13228238 XL |
754 | if (sin->pd_mode_uo && event->mid == sin->mid_uo && |
755 | event->fsn == sin->fsn_uo) | |
756 | retval = sctp_intl_retrieve_partial_uo(ulpq, event); | |
757 | ||
758 | if (!retval) | |
759 | retval = sctp_intl_retrieve_reassembled_uo(ulpq, event); | |
760 | ||
761 | return retval; | |
762 | } | |
763 | ||
764 | static struct sctp_ulpevent *sctp_intl_retrieve_first_uo(struct sctp_ulpq *ulpq) | |
765 | { | |
766 | struct sctp_stream_in *csin, *sin = NULL; | |
767 | struct sk_buff *first_frag = NULL; | |
768 | struct sk_buff *last_frag = NULL; | |
769 | struct sctp_ulpevent *retval; | |
770 | struct sk_buff *pos; | |
771 | __u32 next_fsn = 0; | |
772 | __u16 sid = 0; | |
773 | ||
774 | skb_queue_walk(&ulpq->reasm_uo, pos) { | |
775 | struct sctp_ulpevent *cevent = sctp_skb2event(pos); | |
776 | ||
05364ca0 | 777 | csin = sctp_stream_in(&ulpq->asoc->stream, cevent->stream); |
13228238 XL |
778 | if (csin->pd_mode_uo) |
779 | continue; | |
780 | ||
781 | switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) { | |
782 | case SCTP_DATA_FIRST_FRAG: | |
783 | if (first_frag) | |
784 | goto out; | |
785 | first_frag = pos; | |
786 | last_frag = pos; | |
787 | next_fsn = 0; | |
788 | sin = csin; | |
789 | sid = cevent->stream; | |
790 | sin->mid_uo = cevent->mid; | |
791 | break; | |
792 | case SCTP_DATA_MIDDLE_FRAG: | |
793 | if (!first_frag) | |
794 | break; | |
795 | if (cevent->stream == sid && | |
796 | cevent->mid == sin->mid_uo && | |
797 | cevent->fsn == next_fsn) { | |
798 | next_fsn++; | |
799 | last_frag = pos; | |
800 | } else { | |
801 | goto out; | |
802 | } | |
803 | break; | |
804 | case SCTP_DATA_LAST_FRAG: | |
805 | if (first_frag) | |
806 | goto out; | |
807 | break; | |
808 | default: | |
809 | break; | |
810 | } | |
811 | } | |
812 | ||
813 | if (!first_frag) | |
814 | return NULL; | |
815 | ||
816 | out: | |
817 | retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk), | |
818 | &ulpq->reasm_uo, first_frag, | |
819 | last_frag); | |
820 | if (retval) { | |
821 | sin->fsn_uo = next_fsn; | |
822 | sin->pd_mode_uo = 1; | |
823 | } | |
824 | ||
825 | return retval; | |
826 | } | |
827 | ||
bd4d627d XL |
828 | static int sctp_ulpevent_idata(struct sctp_ulpq *ulpq, |
829 | struct sctp_chunk *chunk, gfp_t gfp) | |
830 | { | |
831 | struct sctp_ulpevent *event; | |
832 | struct sk_buff_head temp; | |
833 | int event_eor = 0; | |
834 | ||
835 | event = sctp_ulpevent_make_rcvmsg(chunk->asoc, chunk, gfp); | |
836 | if (!event) | |
837 | return -ENOMEM; | |
838 | ||
839 | event->mid = ntohl(chunk->subh.idata_hdr->mid); | |
840 | if (event->msg_flags & SCTP_DATA_FIRST_FRAG) | |
841 | event->ppid = chunk->subh.idata_hdr->ppid; | |
842 | else | |
843 | event->fsn = ntohl(chunk->subh.idata_hdr->fsn); | |
844 | ||
13228238 XL |
845 | if (!(event->msg_flags & SCTP_DATA_UNORDERED)) { |
846 | event = sctp_intl_reasm(ulpq, event); | |
178ca044 | 847 | if (event) { |
13228238 XL |
848 | skb_queue_head_init(&temp); |
849 | __skb_queue_tail(&temp, sctp_event2skb(event)); | |
bd4d627d | 850 | |
178ca044 DM |
851 | if (event->msg_flags & MSG_EOR) |
852 | event = sctp_intl_order(ulpq, event); | |
13228238 XL |
853 | } |
854 | } else { | |
855 | event = sctp_intl_reasm_uo(ulpq, event); | |
178ca044 DM |
856 | if (event) { |
857 | skb_queue_head_init(&temp); | |
858 | __skb_queue_tail(&temp, sctp_event2skb(event)); | |
859 | } | |
bd4d627d XL |
860 | } |
861 | ||
862 | if (event) { | |
863 | event_eor = (event->msg_flags & MSG_EOR) ? 1 : 0; | |
178ca044 | 864 | sctp_enqueue_event(ulpq, &temp); |
bd4d627d XL |
865 | } |
866 | ||
867 | return event_eor; | |
868 | } | |
869 | ||
94014e8d XL |
870 | static struct sctp_ulpevent *sctp_intl_retrieve_first(struct sctp_ulpq *ulpq) |
871 | { | |
872 | struct sctp_stream_in *csin, *sin = NULL; | |
873 | struct sk_buff *first_frag = NULL; | |
874 | struct sk_buff *last_frag = NULL; | |
875 | struct sctp_ulpevent *retval; | |
876 | struct sk_buff *pos; | |
877 | __u32 next_fsn = 0; | |
878 | __u16 sid = 0; | |
879 | ||
880 | skb_queue_walk(&ulpq->reasm, pos) { | |
881 | struct sctp_ulpevent *cevent = sctp_skb2event(pos); | |
882 | ||
05364ca0 | 883 | csin = sctp_stream_in(&ulpq->asoc->stream, cevent->stream); |
94014e8d XL |
884 | if (csin->pd_mode) |
885 | continue; | |
886 | ||
887 | switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) { | |
888 | case SCTP_DATA_FIRST_FRAG: | |
889 | if (first_frag) | |
890 | goto out; | |
891 | if (cevent->mid == csin->mid) { | |
892 | first_frag = pos; | |
893 | last_frag = pos; | |
894 | next_fsn = 0; | |
895 | sin = csin; | |
896 | sid = cevent->stream; | |
897 | } | |
898 | break; | |
899 | case SCTP_DATA_MIDDLE_FRAG: | |
900 | if (!first_frag) | |
901 | break; | |
902 | if (cevent->stream == sid && | |
903 | cevent->mid == sin->mid && | |
904 | cevent->fsn == next_fsn) { | |
905 | next_fsn++; | |
906 | last_frag = pos; | |
907 | } else { | |
908 | goto out; | |
909 | } | |
910 | break; | |
911 | case SCTP_DATA_LAST_FRAG: | |
912 | if (first_frag) | |
913 | goto out; | |
914 | break; | |
915 | default: | |
916 | break; | |
917 | } | |
918 | } | |
919 | ||
920 | if (!first_frag) | |
921 | return NULL; | |
922 | ||
923 | out: | |
924 | retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk), | |
925 | &ulpq->reasm, first_frag, | |
926 | last_frag); | |
927 | if (retval) { | |
928 | sin->fsn = next_fsn; | |
929 | sin->pd_mode = 1; | |
930 | } | |
931 | ||
932 | return retval; | |
933 | } | |
934 | ||
935 | static void sctp_intl_start_pd(struct sctp_ulpq *ulpq, gfp_t gfp) | |
936 | { | |
937 | struct sctp_ulpevent *event; | |
178ca044 | 938 | struct sk_buff_head temp; |
94014e8d | 939 | |
13228238 XL |
940 | if (!skb_queue_empty(&ulpq->reasm)) { |
941 | do { | |
942 | event = sctp_intl_retrieve_first(ulpq); | |
178ca044 DM |
943 | if (event) { |
944 | skb_queue_head_init(&temp); | |
945 | __skb_queue_tail(&temp, sctp_event2skb(event)); | |
946 | sctp_enqueue_event(ulpq, &temp); | |
947 | } | |
13228238 XL |
948 | } while (event); |
949 | } | |
94014e8d | 950 | |
13228238 XL |
951 | if (!skb_queue_empty(&ulpq->reasm_uo)) { |
952 | do { | |
953 | event = sctp_intl_retrieve_first_uo(ulpq); | |
178ca044 DM |
954 | if (event) { |
955 | skb_queue_head_init(&temp); | |
956 | __skb_queue_tail(&temp, sctp_event2skb(event)); | |
957 | sctp_enqueue_event(ulpq, &temp); | |
958 | } | |
13228238 XL |
959 | } while (event); |
960 | } | |
94014e8d XL |
961 | } |
962 | ||
963 | static void sctp_renege_events(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk, | |
964 | gfp_t gfp) | |
965 | { | |
966 | struct sctp_association *asoc = ulpq->asoc; | |
967 | __u32 freed = 0; | |
968 | __u16 needed; | |
969 | ||
fb234035 XL |
970 | needed = ntohs(chunk->chunk_hdr->length) - |
971 | sizeof(struct sctp_idata_chunk); | |
94014e8d XL |
972 | |
973 | if (skb_queue_empty(&asoc->base.sk->sk_receive_queue)) { | |
974 | freed = sctp_ulpq_renege_list(ulpq, &ulpq->lobby, needed); | |
975 | if (freed < needed) | |
976 | freed += sctp_ulpq_renege_list(ulpq, &ulpq->reasm, | |
977 | needed); | |
13228238 XL |
978 | if (freed < needed) |
979 | freed += sctp_ulpq_renege_list(ulpq, &ulpq->reasm_uo, | |
980 | needed); | |
94014e8d XL |
981 | } |
982 | ||
9ab2323c XL |
983 | if (freed >= needed && sctp_ulpevent_idata(ulpq, chunk, gfp) <= 0) |
984 | sctp_intl_start_pd(ulpq, gfp); | |
94014e8d XL |
985 | |
986 | sk_mem_reclaim(asoc->base.sk); | |
987 | } | |
988 | ||
65f5e357 XL |
989 | static void sctp_intl_stream_abort_pd(struct sctp_ulpq *ulpq, __u16 sid, |
990 | __u32 mid, __u16 flags, gfp_t gfp) | |
991 | { | |
992 | struct sock *sk = ulpq->asoc->base.sk; | |
993 | struct sctp_ulpevent *ev = NULL; | |
994 | ||
a1e3a059 | 995 | if (!sctp_ulpevent_type_enabled(ulpq->asoc->subscribe, |
2cc0eeb6 | 996 | SCTP_PARTIAL_DELIVERY_EVENT)) |
65f5e357 XL |
997 | return; |
998 | ||
999 | ev = sctp_ulpevent_make_pdapi(ulpq->asoc, SCTP_PARTIAL_DELIVERY_ABORTED, | |
1000 | sid, mid, flags, gfp); | |
1001 | if (ev) { | |
a1e3a059 XL |
1002 | struct sctp_sock *sp = sctp_sk(sk); |
1003 | ||
65f5e357 XL |
1004 | __skb_queue_tail(&sk->sk_receive_queue, sctp_event2skb(ev)); |
1005 | ||
2cc0eeb6 XL |
1006 | if (!sp->data_ready_signalled) { |
1007 | sp->data_ready_signalled = 1; | |
65f5e357 XL |
1008 | sk->sk_data_ready(sk); |
1009 | } | |
1010 | } | |
1011 | } | |
1012 | ||
1013 | static void sctp_intl_reap_ordered(struct sctp_ulpq *ulpq, __u16 sid) | |
1014 | { | |
1015 | struct sctp_stream *stream = &ulpq->asoc->stream; | |
1016 | struct sctp_ulpevent *cevent, *event = NULL; | |
1017 | struct sk_buff_head *lobby = &ulpq->lobby; | |
1018 | struct sk_buff *pos, *tmp; | |
1019 | struct sk_buff_head temp; | |
1020 | __u16 csid; | |
1021 | __u32 cmid; | |
1022 | ||
1023 | skb_queue_head_init(&temp); | |
1024 | sctp_skb_for_each(pos, lobby, tmp) { | |
1025 | cevent = (struct sctp_ulpevent *)pos->cb; | |
1026 | csid = cevent->stream; | |
1027 | cmid = cevent->mid; | |
1028 | ||
1029 | if (csid > sid) | |
1030 | break; | |
1031 | ||
1032 | if (csid < sid) | |
1033 | continue; | |
1034 | ||
1035 | if (!MID_lt(cmid, sctp_mid_peek(stream, in, csid))) | |
1036 | break; | |
1037 | ||
1038 | __skb_unlink(pos, lobby); | |
1039 | if (!event) | |
1040 | event = sctp_skb2event(pos); | |
1041 | ||
1042 | __skb_queue_tail(&temp, pos); | |
1043 | } | |
1044 | ||
1045 | if (!event && pos != (struct sk_buff *)lobby) { | |
1046 | cevent = (struct sctp_ulpevent *)pos->cb; | |
1047 | csid = cevent->stream; | |
1048 | cmid = cevent->mid; | |
1049 | ||
1050 | if (csid == sid && cmid == sctp_mid_peek(stream, in, csid)) { | |
1051 | sctp_mid_next(stream, in, csid); | |
1052 | __skb_unlink(pos, lobby); | |
1053 | __skb_queue_tail(&temp, pos); | |
1054 | event = sctp_skb2event(pos); | |
1055 | } | |
1056 | } | |
1057 | ||
1058 | if (event) { | |
1059 | sctp_intl_retrieve_ordered(ulpq, event); | |
178ca044 | 1060 | sctp_enqueue_event(ulpq, &temp); |
65f5e357 XL |
1061 | } |
1062 | } | |
1063 | ||
1064 | static void sctp_intl_abort_pd(struct sctp_ulpq *ulpq, gfp_t gfp) | |
1065 | { | |
1066 | struct sctp_stream *stream = &ulpq->asoc->stream; | |
1067 | __u16 sid; | |
1068 | ||
1069 | for (sid = 0; sid < stream->incnt; sid++) { | |
05364ca0 | 1070 | struct sctp_stream_in *sin = SCTP_SI(stream, sid); |
65f5e357 XL |
1071 | __u32 mid; |
1072 | ||
13228238 XL |
1073 | if (sin->pd_mode_uo) { |
1074 | sin->pd_mode_uo = 0; | |
1075 | ||
1076 | mid = sin->mid_uo; | |
1077 | sctp_intl_stream_abort_pd(ulpq, sid, mid, 0x1, gfp); | |
1078 | } | |
1079 | ||
65f5e357 XL |
1080 | if (sin->pd_mode) { |
1081 | sin->pd_mode = 0; | |
1082 | ||
1083 | mid = sin->mid; | |
1084 | sctp_intl_stream_abort_pd(ulpq, sid, mid, 0, gfp); | |
1085 | sctp_mid_skip(stream, in, sid, mid); | |
1086 | ||
1087 | sctp_intl_reap_ordered(ulpq, sid); | |
1088 | } | |
1089 | } | |
1090 | ||
1091 | /* intl abort pd happens only when all data needs to be cleaned */ | |
1092 | sctp_ulpq_flush(ulpq); | |
1093 | } | |
1094 | ||
8e0c3b73 XL |
1095 | static inline int sctp_get_skip_pos(struct sctp_ifwdtsn_skip *skiplist, |
1096 | int nskips, __be16 stream, __u8 flags) | |
1097 | { | |
1098 | int i; | |
1099 | ||
1100 | for (i = 0; i < nskips; i++) | |
1101 | if (skiplist[i].stream == stream && | |
1102 | skiplist[i].flags == flags) | |
1103 | return i; | |
1104 | ||
1105 | return i; | |
1106 | } | |
1107 | ||
1108 | #define SCTP_FTSN_U_BIT 0x1 | |
1109 | static void sctp_generate_iftsn(struct sctp_outq *q, __u32 ctsn) | |
1110 | { | |
1111 | struct sctp_ifwdtsn_skip ftsn_skip_arr[10]; | |
1112 | struct sctp_association *asoc = q->asoc; | |
1113 | struct sctp_chunk *ftsn_chunk = NULL; | |
1114 | struct list_head *lchunk, *temp; | |
1115 | int nskips = 0, skip_pos; | |
1116 | struct sctp_chunk *chunk; | |
1117 | __u32 tsn; | |
1118 | ||
1119 | if (!asoc->peer.prsctp_capable) | |
1120 | return; | |
1121 | ||
1122 | if (TSN_lt(asoc->adv_peer_ack_point, ctsn)) | |
1123 | asoc->adv_peer_ack_point = ctsn; | |
1124 | ||
1125 | list_for_each_safe(lchunk, temp, &q->abandoned) { | |
1126 | chunk = list_entry(lchunk, struct sctp_chunk, transmitted_list); | |
1127 | tsn = ntohl(chunk->subh.data_hdr->tsn); | |
1128 | ||
1129 | if (TSN_lte(tsn, ctsn)) { | |
1130 | list_del_init(lchunk); | |
1131 | sctp_chunk_free(chunk); | |
1132 | } else if (TSN_lte(tsn, asoc->adv_peer_ack_point + 1)) { | |
1133 | __be16 sid = chunk->subh.idata_hdr->stream; | |
1134 | __be32 mid = chunk->subh.idata_hdr->mid; | |
1135 | __u8 flags = 0; | |
1136 | ||
1137 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) | |
1138 | flags |= SCTP_FTSN_U_BIT; | |
1139 | ||
1140 | asoc->adv_peer_ack_point = tsn; | |
1141 | skip_pos = sctp_get_skip_pos(&ftsn_skip_arr[0], nskips, | |
1142 | sid, flags); | |
1143 | ftsn_skip_arr[skip_pos].stream = sid; | |
1144 | ftsn_skip_arr[skip_pos].reserved = 0; | |
1145 | ftsn_skip_arr[skip_pos].flags = flags; | |
1146 | ftsn_skip_arr[skip_pos].mid = mid; | |
1147 | if (skip_pos == nskips) | |
1148 | nskips++; | |
1149 | if (nskips == 10) | |
1150 | break; | |
1151 | } else { | |
1152 | break; | |
1153 | } | |
1154 | } | |
1155 | ||
1156 | if (asoc->adv_peer_ack_point > ctsn) | |
1157 | ftsn_chunk = sctp_make_ifwdtsn(asoc, asoc->adv_peer_ack_point, | |
1158 | nskips, &ftsn_skip_arr[0]); | |
1159 | ||
1160 | if (ftsn_chunk) { | |
1161 | list_add_tail(&ftsn_chunk->list, &q->control_chunk_list); | |
1162 | SCTP_INC_STATS(sock_net(asoc->base.sk), SCTP_MIB_OUTCTRLCHUNKS); | |
1163 | } | |
1164 | } | |
1165 | ||
0fc2ea92 XL |
1166 | #define _sctp_walk_ifwdtsn(pos, chunk, end) \ |
1167 | for (pos = chunk->subh.ifwdtsn_hdr->skip; \ | |
1168 | (void *)pos < (void *)chunk->subh.ifwdtsn_hdr->skip + (end); pos++) | |
1169 | ||
1170 | #define sctp_walk_ifwdtsn(pos, ch) \ | |
1171 | _sctp_walk_ifwdtsn((pos), (ch), ntohs((ch)->chunk_hdr->length) - \ | |
1172 | sizeof(struct sctp_ifwdtsn_chunk)) | |
1173 | ||
1174 | static bool sctp_validate_fwdtsn(struct sctp_chunk *chunk) | |
1175 | { | |
1176 | struct sctp_fwdtsn_skip *skip; | |
1177 | __u16 incnt; | |
1178 | ||
1179 | if (chunk->chunk_hdr->type != SCTP_CID_FWD_TSN) | |
1180 | return false; | |
1181 | ||
1182 | incnt = chunk->asoc->stream.incnt; | |
1183 | sctp_walk_fwdtsn(skip, chunk) | |
1184 | if (ntohs(skip->stream) >= incnt) | |
1185 | return false; | |
1186 | ||
1187 | return true; | |
1188 | } | |
1189 | ||
1190 | static bool sctp_validate_iftsn(struct sctp_chunk *chunk) | |
1191 | { | |
1192 | struct sctp_ifwdtsn_skip *skip; | |
1193 | __u16 incnt; | |
1194 | ||
1195 | if (chunk->chunk_hdr->type != SCTP_CID_I_FWD_TSN) | |
1196 | return false; | |
1197 | ||
1198 | incnt = chunk->asoc->stream.incnt; | |
1199 | sctp_walk_ifwdtsn(skip, chunk) | |
1200 | if (ntohs(skip->stream) >= incnt) | |
1201 | return false; | |
1202 | ||
1203 | return true; | |
1204 | } | |
1205 | ||
47b20a88 XL |
1206 | static void sctp_report_fwdtsn(struct sctp_ulpq *ulpq, __u32 ftsn) |
1207 | { | |
1208 | /* Move the Cumulattive TSN Ack ahead. */ | |
1209 | sctp_tsnmap_skip(&ulpq->asoc->peer.tsn_map, ftsn); | |
1210 | /* purge the fragmentation queue */ | |
1211 | sctp_ulpq_reasm_flushtsn(ulpq, ftsn); | |
1212 | /* Abort any in progress partial delivery. */ | |
1213 | sctp_ulpq_abort_pd(ulpq, GFP_ATOMIC); | |
1214 | } | |
1215 | ||
1216 | static void sctp_intl_reasm_flushtsn(struct sctp_ulpq *ulpq, __u32 ftsn) | |
1217 | { | |
1218 | struct sk_buff *pos, *tmp; | |
1219 | ||
1220 | skb_queue_walk_safe(&ulpq->reasm, pos, tmp) { | |
1221 | struct sctp_ulpevent *event = sctp_skb2event(pos); | |
1222 | __u32 tsn = event->tsn; | |
1223 | ||
1224 | if (TSN_lte(tsn, ftsn)) { | |
1225 | __skb_unlink(pos, &ulpq->reasm); | |
1226 | sctp_ulpevent_free(event); | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | skb_queue_walk_safe(&ulpq->reasm_uo, pos, tmp) { | |
1231 | struct sctp_ulpevent *event = sctp_skb2event(pos); | |
1232 | __u32 tsn = event->tsn; | |
1233 | ||
1234 | if (TSN_lte(tsn, ftsn)) { | |
1235 | __skb_unlink(pos, &ulpq->reasm_uo); | |
1236 | sctp_ulpevent_free(event); | |
1237 | } | |
1238 | } | |
1239 | } | |
1240 | ||
1241 | static void sctp_report_iftsn(struct sctp_ulpq *ulpq, __u32 ftsn) | |
1242 | { | |
1243 | /* Move the Cumulattive TSN Ack ahead. */ | |
1244 | sctp_tsnmap_skip(&ulpq->asoc->peer.tsn_map, ftsn); | |
1245 | /* purge the fragmentation queue */ | |
1246 | sctp_intl_reasm_flushtsn(ulpq, ftsn); | |
1247 | /* abort only when it's for all data */ | |
1248 | if (ftsn == sctp_tsnmap_get_max_tsn_seen(&ulpq->asoc->peer.tsn_map)) | |
1249 | sctp_intl_abort_pd(ulpq, GFP_ATOMIC); | |
1250 | } | |
1251 | ||
de60fe91 XL |
1252 | static void sctp_handle_fwdtsn(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk) |
1253 | { | |
1254 | struct sctp_fwdtsn_skip *skip; | |
1255 | ||
1256 | /* Walk through all the skipped SSNs */ | |
1257 | sctp_walk_fwdtsn(skip, chunk) | |
1258 | sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn)); | |
1259 | } | |
1260 | ||
1261 | static void sctp_intl_skip(struct sctp_ulpq *ulpq, __u16 sid, __u32 mid, | |
1262 | __u8 flags) | |
1263 | { | |
05364ca0 | 1264 | struct sctp_stream_in *sin = sctp_stream_in(&ulpq->asoc->stream, sid); |
de60fe91 XL |
1265 | struct sctp_stream *stream = &ulpq->asoc->stream; |
1266 | ||
1267 | if (flags & SCTP_FTSN_U_BIT) { | |
1268 | if (sin->pd_mode_uo && MID_lt(sin->mid_uo, mid)) { | |
1269 | sin->pd_mode_uo = 0; | |
1270 | sctp_intl_stream_abort_pd(ulpq, sid, mid, 0x1, | |
1271 | GFP_ATOMIC); | |
1272 | } | |
1273 | return; | |
1274 | } | |
1275 | ||
1276 | if (MID_lt(mid, sctp_mid_peek(stream, in, sid))) | |
1277 | return; | |
1278 | ||
1279 | if (sin->pd_mode) { | |
1280 | sin->pd_mode = 0; | |
1281 | sctp_intl_stream_abort_pd(ulpq, sid, mid, 0x0, GFP_ATOMIC); | |
1282 | } | |
1283 | ||
1284 | sctp_mid_skip(stream, in, sid, mid); | |
1285 | ||
1286 | sctp_intl_reap_ordered(ulpq, sid); | |
1287 | } | |
1288 | ||
1289 | static void sctp_handle_iftsn(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk) | |
1290 | { | |
1291 | struct sctp_ifwdtsn_skip *skip; | |
1292 | ||
1293 | /* Walk through all the skipped MIDs and abort stream pd if possible */ | |
1294 | sctp_walk_ifwdtsn(skip, chunk) | |
1295 | sctp_intl_skip(ulpq, ntohs(skip->stream), | |
1296 | ntohl(skip->mid), skip->flags); | |
1297 | } | |
1298 | ||
5e8f641d DM |
1299 | static int do_ulpq_tail_event(struct sctp_ulpq *ulpq, struct sctp_ulpevent *event) |
1300 | { | |
1301 | struct sk_buff_head temp; | |
1302 | ||
1303 | skb_queue_head_init(&temp); | |
1304 | __skb_queue_tail(&temp, sctp_event2skb(event)); | |
013b96ec | 1305 | return sctp_ulpq_tail_event(ulpq, &temp); |
5e8f641d DM |
1306 | } |
1307 | ||
0c3f6f65 XL |
1308 | static struct sctp_stream_interleave sctp_stream_interleave_0 = { |
1309 | .data_chunk_len = sizeof(struct sctp_data_chunk), | |
0fc2ea92 | 1310 | .ftsn_chunk_len = sizeof(struct sctp_fwdtsn_chunk), |
0c3f6f65 XL |
1311 | /* DATA process functions */ |
1312 | .make_datafrag = sctp_make_datafrag_empty, | |
668c9beb | 1313 | .assign_number = sctp_chunk_assign_ssn, |
9d4ceaf1 | 1314 | .validate_data = sctp_validate_data, |
bd4d627d | 1315 | .ulpevent_data = sctp_ulpq_tail_data, |
5e8f641d | 1316 | .enqueue_event = do_ulpq_tail_event, |
94014e8d | 1317 | .renege_events = sctp_ulpq_renege, |
be4e0ce1 | 1318 | .start_pd = sctp_ulpq_partial_delivery, |
65f5e357 | 1319 | .abort_pd = sctp_ulpq_abort_pd, |
8e0c3b73 XL |
1320 | /* FORWARD-TSN process functions */ |
1321 | .generate_ftsn = sctp_generate_fwdtsn, | |
0fc2ea92 | 1322 | .validate_ftsn = sctp_validate_fwdtsn, |
47b20a88 | 1323 | .report_ftsn = sctp_report_fwdtsn, |
de60fe91 | 1324 | .handle_ftsn = sctp_handle_fwdtsn, |
0c3f6f65 XL |
1325 | }; |
1326 | ||
178ca044 DM |
1327 | static int do_sctp_enqueue_event(struct sctp_ulpq *ulpq, |
1328 | struct sctp_ulpevent *event) | |
1329 | { | |
1330 | struct sk_buff_head temp; | |
1331 | ||
1332 | skb_queue_head_init(&temp); | |
1333 | __skb_queue_tail(&temp, sctp_event2skb(event)); | |
1334 | return sctp_enqueue_event(ulpq, &temp); | |
1335 | } | |
1336 | ||
0c3f6f65 XL |
1337 | static struct sctp_stream_interleave sctp_stream_interleave_1 = { |
1338 | .data_chunk_len = sizeof(struct sctp_idata_chunk), | |
0fc2ea92 | 1339 | .ftsn_chunk_len = sizeof(struct sctp_ifwdtsn_chunk), |
0c3f6f65 XL |
1340 | /* I-DATA process functions */ |
1341 | .make_datafrag = sctp_make_idatafrag_empty, | |
668c9beb | 1342 | .assign_number = sctp_chunk_assign_mid, |
9d4ceaf1 | 1343 | .validate_data = sctp_validate_idata, |
bd4d627d | 1344 | .ulpevent_data = sctp_ulpevent_idata, |
178ca044 | 1345 | .enqueue_event = do_sctp_enqueue_event, |
94014e8d | 1346 | .renege_events = sctp_renege_events, |
be4e0ce1 | 1347 | .start_pd = sctp_intl_start_pd, |
65f5e357 | 1348 | .abort_pd = sctp_intl_abort_pd, |
8e0c3b73 XL |
1349 | /* I-FORWARD-TSN process functions */ |
1350 | .generate_ftsn = sctp_generate_iftsn, | |
0fc2ea92 | 1351 | .validate_ftsn = sctp_validate_iftsn, |
47b20a88 | 1352 | .report_ftsn = sctp_report_iftsn, |
de60fe91 | 1353 | .handle_ftsn = sctp_handle_iftsn, |
0c3f6f65 XL |
1354 | }; |
1355 | ||
1356 | void sctp_stream_interleave_init(struct sctp_stream *stream) | |
1357 | { | |
1358 | struct sctp_association *asoc; | |
1359 | ||
1360 | asoc = container_of(stream, struct sctp_association, stream); | |
da1f6d4d XL |
1361 | stream->si = asoc->peer.intl_capable ? &sctp_stream_interleave_1 |
1362 | : &sctp_stream_interleave_0; | |
0c3f6f65 | 1363 | } |