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0c3f6f65 XL |
1 | /* SCTP kernel implementation |
2 | * (C) Copyright Red Hat Inc. 2017 | |
3 | * | |
4 | * This file is part of the SCTP kernel implementation | |
5 | * | |
fae8b6f4 XL |
6 | * These functions implement sctp stream message interleaving, mostly |
7 | * including I-DATA and I-FORWARD-TSN chunks process. | |
0c3f6f65 XL |
8 | * |
9 | * This SCTP implementation is free software; | |
10 | * you can redistribute it and/or modify it under the terms of | |
11 | * the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2, or (at your option) | |
13 | * any later version. | |
14 | * | |
15 | * This SCTP implementation is distributed in the hope that it | |
16 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied | |
17 | * ************************ | |
18 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
19 | * See the GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with GNU CC; see the file COPYING. If not, see | |
23 | * <http://www.gnu.org/licenses/>. | |
24 | * | |
25 | * Please send any bug reports or fixes you make to the | |
26 | * email addresched(es): | |
27 | * lksctp developers <linux-sctp@vger.kernel.org> | |
28 | * | |
29 | * Written or modified by: | |
30 | * Xin Long <lucien.xin@gmail.com> | |
31 | */ | |
32 | ||
bd4d627d | 33 | #include <net/busy_poll.h> |
0c3f6f65 XL |
34 | #include <net/sctp/sctp.h> |
35 | #include <net/sctp/sm.h> | |
bd4d627d | 36 | #include <net/sctp/ulpevent.h> |
0c3f6f65 XL |
37 | #include <linux/sctp.h> |
38 | ||
39 | static struct sctp_chunk *sctp_make_idatafrag_empty( | |
40 | const struct sctp_association *asoc, | |
41 | const struct sctp_sndrcvinfo *sinfo, | |
42 | int len, __u8 flags, gfp_t gfp) | |
43 | { | |
44 | struct sctp_chunk *retval; | |
45 | struct sctp_idatahdr dp; | |
46 | ||
47 | memset(&dp, 0, sizeof(dp)); | |
48 | dp.stream = htons(sinfo->sinfo_stream); | |
49 | ||
50 | if (sinfo->sinfo_flags & SCTP_UNORDERED) | |
51 | flags |= SCTP_DATA_UNORDERED; | |
52 | ||
53 | retval = sctp_make_idata(asoc, flags, sizeof(dp) + len, gfp); | |
54 | if (!retval) | |
55 | return NULL; | |
56 | ||
57 | retval->subh.idata_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); | |
58 | memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); | |
59 | ||
60 | return retval; | |
61 | } | |
62 | ||
668c9beb XL |
63 | static void sctp_chunk_assign_mid(struct sctp_chunk *chunk) |
64 | { | |
65 | struct sctp_stream *stream; | |
66 | struct sctp_chunk *lchunk; | |
67 | __u32 cfsn = 0; | |
68 | __u16 sid; | |
69 | ||
70 | if (chunk->has_mid) | |
71 | return; | |
72 | ||
73 | sid = sctp_chunk_stream_no(chunk); | |
74 | stream = &chunk->asoc->stream; | |
75 | ||
76 | list_for_each_entry(lchunk, &chunk->msg->chunks, frag_list) { | |
77 | struct sctp_idatahdr *hdr; | |
13228238 | 78 | __u32 mid; |
668c9beb XL |
79 | |
80 | lchunk->has_mid = 1; | |
81 | ||
668c9beb XL |
82 | hdr = lchunk->subh.idata_hdr; |
83 | ||
84 | if (lchunk->chunk_hdr->flags & SCTP_DATA_FIRST_FRAG) | |
85 | hdr->ppid = lchunk->sinfo.sinfo_ppid; | |
86 | else | |
87 | hdr->fsn = htonl(cfsn++); | |
88 | ||
13228238 XL |
89 | if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { |
90 | mid = lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG ? | |
91 | sctp_mid_uo_next(stream, out, sid) : | |
92 | sctp_mid_uo_peek(stream, out, sid); | |
93 | } else { | |
94 | mid = lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG ? | |
95 | sctp_mid_next(stream, out, sid) : | |
96 | sctp_mid_peek(stream, out, sid); | |
97 | } | |
98 | hdr->mid = htonl(mid); | |
668c9beb XL |
99 | } |
100 | } | |
101 | ||
9d4ceaf1 XL |
102 | static bool sctp_validate_data(struct sctp_chunk *chunk) |
103 | { | |
104 | const struct sctp_stream *stream; | |
105 | __u16 sid, ssn; | |
106 | ||
107 | if (chunk->chunk_hdr->type != SCTP_CID_DATA) | |
108 | return false; | |
109 | ||
110 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) | |
111 | return true; | |
112 | ||
113 | stream = &chunk->asoc->stream; | |
114 | sid = sctp_chunk_stream_no(chunk); | |
115 | ssn = ntohs(chunk->subh.data_hdr->ssn); | |
116 | ||
117 | return !SSN_lt(ssn, sctp_ssn_peek(stream, in, sid)); | |
118 | } | |
119 | ||
120 | static bool sctp_validate_idata(struct sctp_chunk *chunk) | |
121 | { | |
122 | struct sctp_stream *stream; | |
123 | __u32 mid; | |
124 | __u16 sid; | |
125 | ||
126 | if (chunk->chunk_hdr->type != SCTP_CID_I_DATA) | |
127 | return false; | |
128 | ||
129 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) | |
130 | return true; | |
131 | ||
132 | stream = &chunk->asoc->stream; | |
133 | sid = sctp_chunk_stream_no(chunk); | |
134 | mid = ntohl(chunk->subh.idata_hdr->mid); | |
135 | ||
136 | return !MID_lt(mid, sctp_mid_peek(stream, in, sid)); | |
137 | } | |
138 | ||
bd4d627d XL |
139 | static void sctp_intl_store_reasm(struct sctp_ulpq *ulpq, |
140 | struct sctp_ulpevent *event) | |
141 | { | |
142 | struct sctp_ulpevent *cevent; | |
348bbc25 | 143 | struct sk_buff *pos, *loc; |
bd4d627d XL |
144 | |
145 | pos = skb_peek_tail(&ulpq->reasm); | |
146 | if (!pos) { | |
147 | __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event)); | |
148 | return; | |
149 | } | |
150 | ||
151 | cevent = sctp_skb2event(pos); | |
152 | ||
153 | if (event->stream == cevent->stream && | |
154 | event->mid == cevent->mid && | |
155 | (cevent->msg_flags & SCTP_DATA_FIRST_FRAG || | |
156 | (!(event->msg_flags & SCTP_DATA_FIRST_FRAG) && | |
157 | event->fsn > cevent->fsn))) { | |
158 | __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event)); | |
159 | return; | |
160 | } | |
161 | ||
162 | if ((event->stream == cevent->stream && | |
163 | MID_lt(cevent->mid, event->mid)) || | |
164 | event->stream > cevent->stream) { | |
165 | __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event)); | |
166 | return; | |
167 | } | |
168 | ||
348bbc25 | 169 | loc = NULL; |
bd4d627d XL |
170 | skb_queue_walk(&ulpq->reasm, pos) { |
171 | cevent = sctp_skb2event(pos); | |
172 | ||
173 | if (event->stream < cevent->stream || | |
174 | (event->stream == cevent->stream && | |
348bbc25 DM |
175 | MID_lt(event->mid, cevent->mid))) { |
176 | loc = pos; | |
bd4d627d | 177 | break; |
348bbc25 | 178 | } |
bd4d627d XL |
179 | if (event->stream == cevent->stream && |
180 | event->mid == cevent->mid && | |
181 | !(cevent->msg_flags & SCTP_DATA_FIRST_FRAG) && | |
182 | (event->msg_flags & SCTP_DATA_FIRST_FRAG || | |
348bbc25 DM |
183 | event->fsn < cevent->fsn)) { |
184 | loc = pos; | |
bd4d627d | 185 | break; |
348bbc25 | 186 | } |
bd4d627d XL |
187 | } |
188 | ||
348bbc25 DM |
189 | if (!loc) |
190 | __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event)); | |
191 | else | |
192 | __skb_queue_before(&ulpq->reasm, loc, sctp_event2skb(event)); | |
bd4d627d XL |
193 | } |
194 | ||
195 | static struct sctp_ulpevent *sctp_intl_retrieve_partial( | |
196 | struct sctp_ulpq *ulpq, | |
197 | struct sctp_ulpevent *event) | |
198 | { | |
199 | struct sk_buff *first_frag = NULL; | |
200 | struct sk_buff *last_frag = NULL; | |
201 | struct sctp_ulpevent *retval; | |
202 | struct sctp_stream_in *sin; | |
203 | struct sk_buff *pos; | |
204 | __u32 next_fsn = 0; | |
205 | int is_last = 0; | |
206 | ||
05364ca0 | 207 | sin = sctp_stream_in(&ulpq->asoc->stream, event->stream); |
bd4d627d XL |
208 | |
209 | skb_queue_walk(&ulpq->reasm, pos) { | |
210 | struct sctp_ulpevent *cevent = sctp_skb2event(pos); | |
211 | ||
212 | if (cevent->stream < event->stream) | |
213 | continue; | |
214 | ||
215 | if (cevent->stream > event->stream || | |
216 | cevent->mid != sin->mid) | |
217 | break; | |
218 | ||
219 | switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) { | |
220 | case SCTP_DATA_FIRST_FRAG: | |
221 | goto out; | |
222 | case SCTP_DATA_MIDDLE_FRAG: | |
223 | if (!first_frag) { | |
224 | if (cevent->fsn == sin->fsn) { | |
225 | first_frag = pos; | |
226 | last_frag = pos; | |
227 | next_fsn = cevent->fsn + 1; | |
228 | } | |
229 | } else if (cevent->fsn == next_fsn) { | |
230 | last_frag = pos; | |
231 | next_fsn++; | |
232 | } else { | |
233 | goto out; | |
234 | } | |
235 | break; | |
236 | case SCTP_DATA_LAST_FRAG: | |
237 | if (!first_frag) { | |
238 | if (cevent->fsn == sin->fsn) { | |
239 | first_frag = pos; | |
240 | last_frag = pos; | |
241 | next_fsn = 0; | |
242 | is_last = 1; | |
243 | } | |
244 | } else if (cevent->fsn == next_fsn) { | |
245 | last_frag = pos; | |
246 | next_fsn = 0; | |
247 | is_last = 1; | |
248 | } | |
249 | goto out; | |
250 | default: | |
251 | goto out; | |
252 | } | |
253 | } | |
254 | ||
255 | out: | |
256 | if (!first_frag) | |
257 | return NULL; | |
258 | ||
259 | retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk), | |
260 | &ulpq->reasm, first_frag, | |
261 | last_frag); | |
262 | if (retval) { | |
263 | sin->fsn = next_fsn; | |
264 | if (is_last) { | |
265 | retval->msg_flags |= MSG_EOR; | |
266 | sin->pd_mode = 0; | |
267 | } | |
268 | } | |
269 | ||
270 | return retval; | |
271 | } | |
272 | ||
273 | static struct sctp_ulpevent *sctp_intl_retrieve_reassembled( | |
274 | struct sctp_ulpq *ulpq, | |
275 | struct sctp_ulpevent *event) | |
276 | { | |
277 | struct sctp_association *asoc = ulpq->asoc; | |
278 | struct sk_buff *pos, *first_frag = NULL; | |
279 | struct sctp_ulpevent *retval = NULL; | |
280 | struct sk_buff *pd_first = NULL; | |
281 | struct sk_buff *pd_last = NULL; | |
282 | struct sctp_stream_in *sin; | |
283 | __u32 next_fsn = 0; | |
284 | __u32 pd_point = 0; | |
285 | __u32 pd_len = 0; | |
286 | __u32 mid = 0; | |
287 | ||
05364ca0 | 288 | sin = sctp_stream_in(&ulpq->asoc->stream, event->stream); |
bd4d627d XL |
289 | |
290 | skb_queue_walk(&ulpq->reasm, pos) { | |
291 | struct sctp_ulpevent *cevent = sctp_skb2event(pos); | |
292 | ||
293 | if (cevent->stream < event->stream) | |
294 | continue; | |
295 | if (cevent->stream > event->stream) | |
296 | break; | |
297 | ||
298 | if (MID_lt(cevent->mid, event->mid)) | |
299 | continue; | |
300 | if (MID_lt(event->mid, cevent->mid)) | |
301 | break; | |
302 | ||
303 | switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) { | |
304 | case SCTP_DATA_FIRST_FRAG: | |
305 | if (cevent->mid == sin->mid) { | |
306 | pd_first = pos; | |
307 | pd_last = pos; | |
308 | pd_len = pos->len; | |
309 | } | |
310 | ||
311 | first_frag = pos; | |
312 | next_fsn = 0; | |
313 | mid = cevent->mid; | |
314 | break; | |
315 | ||
316 | case SCTP_DATA_MIDDLE_FRAG: | |
317 | if (first_frag && cevent->mid == mid && | |
318 | cevent->fsn == next_fsn) { | |
319 | next_fsn++; | |
320 | if (pd_first) { | |
321 | pd_last = pos; | |
322 | pd_len += pos->len; | |
323 | } | |
324 | } else { | |
325 | first_frag = NULL; | |
326 | } | |
327 | break; | |
328 | ||
329 | case SCTP_DATA_LAST_FRAG: | |
330 | if (first_frag && cevent->mid == mid && | |
331 | cevent->fsn == next_fsn) | |
332 | goto found; | |
333 | else | |
334 | first_frag = NULL; | |
335 | break; | |
336 | } | |
337 | } | |
338 | ||
339 | if (!pd_first) | |
340 | goto out; | |
341 | ||
342 | pd_point = sctp_sk(asoc->base.sk)->pd_point; | |
343 | if (pd_point && pd_point <= pd_len) { | |
344 | retval = sctp_make_reassembled_event(sock_net(asoc->base.sk), | |
345 | &ulpq->reasm, | |
346 | pd_first, pd_last); | |
347 | if (retval) { | |
348 | sin->fsn = next_fsn; | |
349 | sin->pd_mode = 1; | |
350 | } | |
351 | } | |
352 | goto out; | |
353 | ||
354 | found: | |
355 | retval = sctp_make_reassembled_event(sock_net(asoc->base.sk), | |
356 | &ulpq->reasm, | |
357 | first_frag, pos); | |
358 | if (retval) | |
359 | retval->msg_flags |= MSG_EOR; | |
360 | ||
361 | out: | |
362 | return retval; | |
363 | } | |
364 | ||
365 | static struct sctp_ulpevent *sctp_intl_reasm(struct sctp_ulpq *ulpq, | |
366 | struct sctp_ulpevent *event) | |
367 | { | |
368 | struct sctp_ulpevent *retval = NULL; | |
369 | struct sctp_stream_in *sin; | |
370 | ||
371 | if (SCTP_DATA_NOT_FRAG == (event->msg_flags & SCTP_DATA_FRAG_MASK)) { | |
372 | event->msg_flags |= MSG_EOR; | |
373 | return event; | |
374 | } | |
375 | ||
376 | sctp_intl_store_reasm(ulpq, event); | |
377 | ||
05364ca0 | 378 | sin = sctp_stream_in(&ulpq->asoc->stream, event->stream); |
bd4d627d XL |
379 | if (sin->pd_mode && event->mid == sin->mid && |
380 | event->fsn == sin->fsn) | |
381 | retval = sctp_intl_retrieve_partial(ulpq, event); | |
382 | ||
383 | if (!retval) | |
384 | retval = sctp_intl_retrieve_reassembled(ulpq, event); | |
385 | ||
386 | return retval; | |
387 | } | |
388 | ||
389 | static void sctp_intl_store_ordered(struct sctp_ulpq *ulpq, | |
390 | struct sctp_ulpevent *event) | |
391 | { | |
392 | struct sctp_ulpevent *cevent; | |
e15e067d | 393 | struct sk_buff *pos, *loc; |
bd4d627d XL |
394 | |
395 | pos = skb_peek_tail(&ulpq->lobby); | |
396 | if (!pos) { | |
397 | __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event)); | |
398 | return; | |
399 | } | |
400 | ||
401 | cevent = (struct sctp_ulpevent *)pos->cb; | |
402 | if (event->stream == cevent->stream && | |
403 | MID_lt(cevent->mid, event->mid)) { | |
404 | __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event)); | |
405 | return; | |
406 | } | |
407 | ||
408 | if (event->stream > cevent->stream) { | |
409 | __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event)); | |
410 | return; | |
411 | } | |
412 | ||
e15e067d | 413 | loc = NULL; |
bd4d627d XL |
414 | skb_queue_walk(&ulpq->lobby, pos) { |
415 | cevent = (struct sctp_ulpevent *)pos->cb; | |
416 | ||
e15e067d DM |
417 | if (cevent->stream > event->stream) { |
418 | loc = pos; | |
bd4d627d | 419 | break; |
e15e067d | 420 | } |
bd4d627d | 421 | if (cevent->stream == event->stream && |
e15e067d DM |
422 | MID_lt(event->mid, cevent->mid)) { |
423 | loc = pos; | |
bd4d627d | 424 | break; |
e15e067d | 425 | } |
bd4d627d XL |
426 | } |
427 | ||
e15e067d DM |
428 | if (!loc) |
429 | __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event)); | |
430 | else | |
431 | __skb_queue_before(&ulpq->lobby, loc, sctp_event2skb(event)); | |
bd4d627d XL |
432 | } |
433 | ||
434 | static void sctp_intl_retrieve_ordered(struct sctp_ulpq *ulpq, | |
435 | struct sctp_ulpevent *event) | |
436 | { | |
437 | struct sk_buff_head *event_list; | |
438 | struct sctp_stream *stream; | |
439 | struct sk_buff *pos, *tmp; | |
440 | __u16 sid = event->stream; | |
441 | ||
442 | stream = &ulpq->asoc->stream; | |
443 | event_list = (struct sk_buff_head *)sctp_event2skb(event)->prev; | |
444 | ||
445 | sctp_skb_for_each(pos, &ulpq->lobby, tmp) { | |
446 | struct sctp_ulpevent *cevent = (struct sctp_ulpevent *)pos->cb; | |
447 | ||
448 | if (cevent->stream > sid) | |
449 | break; | |
450 | ||
451 | if (cevent->stream < sid) | |
452 | continue; | |
453 | ||
454 | if (cevent->mid != sctp_mid_peek(stream, in, sid)) | |
455 | break; | |
456 | ||
457 | sctp_mid_next(stream, in, sid); | |
458 | ||
459 | __skb_unlink(pos, &ulpq->lobby); | |
460 | ||
461 | __skb_queue_tail(event_list, pos); | |
462 | } | |
463 | } | |
464 | ||
465 | static struct sctp_ulpevent *sctp_intl_order(struct sctp_ulpq *ulpq, | |
466 | struct sctp_ulpevent *event) | |
467 | { | |
468 | struct sctp_stream *stream; | |
469 | __u16 sid; | |
470 | ||
bd4d627d XL |
471 | stream = &ulpq->asoc->stream; |
472 | sid = event->stream; | |
473 | ||
474 | if (event->mid != sctp_mid_peek(stream, in, sid)) { | |
475 | sctp_intl_store_ordered(ulpq, event); | |
476 | return NULL; | |
477 | } | |
478 | ||
479 | sctp_mid_next(stream, in, sid); | |
480 | ||
481 | sctp_intl_retrieve_ordered(ulpq, event); | |
482 | ||
483 | return event; | |
484 | } | |
485 | ||
486 | static int sctp_enqueue_event(struct sctp_ulpq *ulpq, | |
487 | struct sctp_ulpevent *event) | |
488 | { | |
489 | struct sk_buff *skb = sctp_event2skb(event); | |
490 | struct sock *sk = ulpq->asoc->base.sk; | |
491 | struct sctp_sock *sp = sctp_sk(sk); | |
492 | struct sk_buff_head *skb_list; | |
493 | ||
494 | skb_list = (struct sk_buff_head *)skb->prev; | |
495 | ||
496 | if (sk->sk_shutdown & RCV_SHUTDOWN && | |
497 | (sk->sk_shutdown & SEND_SHUTDOWN || | |
498 | !sctp_ulpevent_is_notification(event))) | |
499 | goto out_free; | |
500 | ||
501 | if (!sctp_ulpevent_is_notification(event)) { | |
502 | sk_mark_napi_id(sk, skb); | |
503 | sk_incoming_cpu_update(sk); | |
504 | } | |
505 | ||
a1e3a059 | 506 | if (!sctp_ulpevent_is_enabled(event, ulpq->asoc->subscribe)) |
bd4d627d XL |
507 | goto out_free; |
508 | ||
509 | if (skb_list) | |
510 | skb_queue_splice_tail_init(skb_list, | |
511 | &sk->sk_receive_queue); | |
512 | else | |
513 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
514 | ||
515 | if (!sp->data_ready_signalled) { | |
516 | sp->data_ready_signalled = 1; | |
517 | sk->sk_data_ready(sk); | |
518 | } | |
519 | ||
520 | return 1; | |
521 | ||
522 | out_free: | |
523 | if (skb_list) | |
524 | sctp_queue_purge_ulpevents(skb_list); | |
525 | else | |
526 | sctp_ulpevent_free(event); | |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
13228238 XL |
531 | static void sctp_intl_store_reasm_uo(struct sctp_ulpq *ulpq, |
532 | struct sctp_ulpevent *event) | |
533 | { | |
534 | struct sctp_ulpevent *cevent; | |
535 | struct sk_buff *pos; | |
536 | ||
537 | pos = skb_peek_tail(&ulpq->reasm_uo); | |
538 | if (!pos) { | |
539 | __skb_queue_tail(&ulpq->reasm_uo, sctp_event2skb(event)); | |
540 | return; | |
541 | } | |
542 | ||
543 | cevent = sctp_skb2event(pos); | |
544 | ||
545 | if (event->stream == cevent->stream && | |
546 | event->mid == cevent->mid && | |
547 | (cevent->msg_flags & SCTP_DATA_FIRST_FRAG || | |
548 | (!(event->msg_flags & SCTP_DATA_FIRST_FRAG) && | |
549 | event->fsn > cevent->fsn))) { | |
550 | __skb_queue_tail(&ulpq->reasm_uo, sctp_event2skb(event)); | |
551 | return; | |
552 | } | |
553 | ||
554 | if ((event->stream == cevent->stream && | |
555 | MID_lt(cevent->mid, event->mid)) || | |
556 | event->stream > cevent->stream) { | |
557 | __skb_queue_tail(&ulpq->reasm_uo, sctp_event2skb(event)); | |
558 | return; | |
559 | } | |
560 | ||
561 | skb_queue_walk(&ulpq->reasm_uo, pos) { | |
562 | cevent = sctp_skb2event(pos); | |
563 | ||
564 | if (event->stream < cevent->stream || | |
565 | (event->stream == cevent->stream && | |
566 | MID_lt(event->mid, cevent->mid))) | |
567 | break; | |
568 | ||
569 | if (event->stream == cevent->stream && | |
570 | event->mid == cevent->mid && | |
571 | !(cevent->msg_flags & SCTP_DATA_FIRST_FRAG) && | |
572 | (event->msg_flags & SCTP_DATA_FIRST_FRAG || | |
573 | event->fsn < cevent->fsn)) | |
574 | break; | |
575 | } | |
576 | ||
577 | __skb_queue_before(&ulpq->reasm_uo, pos, sctp_event2skb(event)); | |
578 | } | |
579 | ||
580 | static struct sctp_ulpevent *sctp_intl_retrieve_partial_uo( | |
581 | struct sctp_ulpq *ulpq, | |
582 | struct sctp_ulpevent *event) | |
583 | { | |
584 | struct sk_buff *first_frag = NULL; | |
585 | struct sk_buff *last_frag = NULL; | |
586 | struct sctp_ulpevent *retval; | |
587 | struct sctp_stream_in *sin; | |
588 | struct sk_buff *pos; | |
589 | __u32 next_fsn = 0; | |
590 | int is_last = 0; | |
591 | ||
05364ca0 | 592 | sin = sctp_stream_in(&ulpq->asoc->stream, event->stream); |
13228238 XL |
593 | |
594 | skb_queue_walk(&ulpq->reasm_uo, pos) { | |
595 | struct sctp_ulpevent *cevent = sctp_skb2event(pos); | |
596 | ||
597 | if (cevent->stream < event->stream) | |
598 | continue; | |
599 | if (cevent->stream > event->stream) | |
600 | break; | |
601 | ||
602 | if (MID_lt(cevent->mid, sin->mid_uo)) | |
603 | continue; | |
604 | if (MID_lt(sin->mid_uo, cevent->mid)) | |
605 | break; | |
606 | ||
607 | switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) { | |
608 | case SCTP_DATA_FIRST_FRAG: | |
609 | goto out; | |
610 | case SCTP_DATA_MIDDLE_FRAG: | |
611 | if (!first_frag) { | |
612 | if (cevent->fsn == sin->fsn_uo) { | |
613 | first_frag = pos; | |
614 | last_frag = pos; | |
615 | next_fsn = cevent->fsn + 1; | |
616 | } | |
617 | } else if (cevent->fsn == next_fsn) { | |
618 | last_frag = pos; | |
619 | next_fsn++; | |
620 | } else { | |
621 | goto out; | |
622 | } | |
623 | break; | |
624 | case SCTP_DATA_LAST_FRAG: | |
625 | if (!first_frag) { | |
626 | if (cevent->fsn == sin->fsn_uo) { | |
627 | first_frag = pos; | |
628 | last_frag = pos; | |
629 | next_fsn = 0; | |
630 | is_last = 1; | |
631 | } | |
632 | } else if (cevent->fsn == next_fsn) { | |
633 | last_frag = pos; | |
634 | next_fsn = 0; | |
635 | is_last = 1; | |
636 | } | |
637 | goto out; | |
638 | default: | |
639 | goto out; | |
640 | } | |
641 | } | |
642 | ||
643 | out: | |
644 | if (!first_frag) | |
645 | return NULL; | |
646 | ||
647 | retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk), | |
648 | &ulpq->reasm_uo, first_frag, | |
649 | last_frag); | |
650 | if (retval) { | |
651 | sin->fsn_uo = next_fsn; | |
652 | if (is_last) { | |
653 | retval->msg_flags |= MSG_EOR; | |
654 | sin->pd_mode_uo = 0; | |
655 | } | |
656 | } | |
657 | ||
658 | return retval; | |
659 | } | |
660 | ||
661 | static struct sctp_ulpevent *sctp_intl_retrieve_reassembled_uo( | |
662 | struct sctp_ulpq *ulpq, | |
663 | struct sctp_ulpevent *event) | |
664 | { | |
665 | struct sctp_association *asoc = ulpq->asoc; | |
666 | struct sk_buff *pos, *first_frag = NULL; | |
667 | struct sctp_ulpevent *retval = NULL; | |
668 | struct sk_buff *pd_first = NULL; | |
669 | struct sk_buff *pd_last = NULL; | |
670 | struct sctp_stream_in *sin; | |
671 | __u32 next_fsn = 0; | |
672 | __u32 pd_point = 0; | |
673 | __u32 pd_len = 0; | |
674 | __u32 mid = 0; | |
675 | ||
05364ca0 | 676 | sin = sctp_stream_in(&ulpq->asoc->stream, event->stream); |
13228238 XL |
677 | |
678 | skb_queue_walk(&ulpq->reasm_uo, pos) { | |
679 | struct sctp_ulpevent *cevent = sctp_skb2event(pos); | |
680 | ||
681 | if (cevent->stream < event->stream) | |
682 | continue; | |
683 | if (cevent->stream > event->stream) | |
684 | break; | |
685 | ||
686 | if (MID_lt(cevent->mid, event->mid)) | |
687 | continue; | |
688 | if (MID_lt(event->mid, cevent->mid)) | |
689 | break; | |
690 | ||
691 | switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) { | |
692 | case SCTP_DATA_FIRST_FRAG: | |
693 | if (!sin->pd_mode_uo) { | |
694 | sin->mid_uo = cevent->mid; | |
695 | pd_first = pos; | |
696 | pd_last = pos; | |
697 | pd_len = pos->len; | |
698 | } | |
699 | ||
700 | first_frag = pos; | |
701 | next_fsn = 0; | |
702 | mid = cevent->mid; | |
703 | break; | |
704 | ||
705 | case SCTP_DATA_MIDDLE_FRAG: | |
706 | if (first_frag && cevent->mid == mid && | |
707 | cevent->fsn == next_fsn) { | |
708 | next_fsn++; | |
709 | if (pd_first) { | |
710 | pd_last = pos; | |
711 | pd_len += pos->len; | |
712 | } | |
713 | } else { | |
714 | first_frag = NULL; | |
715 | } | |
716 | break; | |
717 | ||
718 | case SCTP_DATA_LAST_FRAG: | |
719 | if (first_frag && cevent->mid == mid && | |
720 | cevent->fsn == next_fsn) | |
721 | goto found; | |
722 | else | |
723 | first_frag = NULL; | |
724 | break; | |
725 | } | |
726 | } | |
727 | ||
728 | if (!pd_first) | |
729 | goto out; | |
730 | ||
731 | pd_point = sctp_sk(asoc->base.sk)->pd_point; | |
732 | if (pd_point && pd_point <= pd_len) { | |
733 | retval = sctp_make_reassembled_event(sock_net(asoc->base.sk), | |
734 | &ulpq->reasm_uo, | |
735 | pd_first, pd_last); | |
736 | if (retval) { | |
737 | sin->fsn_uo = next_fsn; | |
738 | sin->pd_mode_uo = 1; | |
739 | } | |
740 | } | |
741 | goto out; | |
742 | ||
743 | found: | |
744 | retval = sctp_make_reassembled_event(sock_net(asoc->base.sk), | |
745 | &ulpq->reasm_uo, | |
746 | first_frag, pos); | |
747 | if (retval) | |
748 | retval->msg_flags |= MSG_EOR; | |
749 | ||
750 | out: | |
751 | return retval; | |
752 | } | |
753 | ||
754 | static struct sctp_ulpevent *sctp_intl_reasm_uo(struct sctp_ulpq *ulpq, | |
755 | struct sctp_ulpevent *event) | |
756 | { | |
757 | struct sctp_ulpevent *retval = NULL; | |
758 | struct sctp_stream_in *sin; | |
759 | ||
760 | if (SCTP_DATA_NOT_FRAG == (event->msg_flags & SCTP_DATA_FRAG_MASK)) { | |
761 | event->msg_flags |= MSG_EOR; | |
762 | return event; | |
763 | } | |
764 | ||
765 | sctp_intl_store_reasm_uo(ulpq, event); | |
766 | ||
05364ca0 | 767 | sin = sctp_stream_in(&ulpq->asoc->stream, event->stream); |
13228238 XL |
768 | if (sin->pd_mode_uo && event->mid == sin->mid_uo && |
769 | event->fsn == sin->fsn_uo) | |
770 | retval = sctp_intl_retrieve_partial_uo(ulpq, event); | |
771 | ||
772 | if (!retval) | |
773 | retval = sctp_intl_retrieve_reassembled_uo(ulpq, event); | |
774 | ||
775 | return retval; | |
776 | } | |
777 | ||
778 | static struct sctp_ulpevent *sctp_intl_retrieve_first_uo(struct sctp_ulpq *ulpq) | |
779 | { | |
780 | struct sctp_stream_in *csin, *sin = NULL; | |
781 | struct sk_buff *first_frag = NULL; | |
782 | struct sk_buff *last_frag = NULL; | |
783 | struct sctp_ulpevent *retval; | |
784 | struct sk_buff *pos; | |
785 | __u32 next_fsn = 0; | |
786 | __u16 sid = 0; | |
787 | ||
788 | skb_queue_walk(&ulpq->reasm_uo, pos) { | |
789 | struct sctp_ulpevent *cevent = sctp_skb2event(pos); | |
790 | ||
05364ca0 | 791 | csin = sctp_stream_in(&ulpq->asoc->stream, cevent->stream); |
13228238 XL |
792 | if (csin->pd_mode_uo) |
793 | continue; | |
794 | ||
795 | switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) { | |
796 | case SCTP_DATA_FIRST_FRAG: | |
797 | if (first_frag) | |
798 | goto out; | |
799 | first_frag = pos; | |
800 | last_frag = pos; | |
801 | next_fsn = 0; | |
802 | sin = csin; | |
803 | sid = cevent->stream; | |
804 | sin->mid_uo = cevent->mid; | |
805 | break; | |
806 | case SCTP_DATA_MIDDLE_FRAG: | |
807 | if (!first_frag) | |
808 | break; | |
809 | if (cevent->stream == sid && | |
810 | cevent->mid == sin->mid_uo && | |
811 | cevent->fsn == next_fsn) { | |
812 | next_fsn++; | |
813 | last_frag = pos; | |
814 | } else { | |
815 | goto out; | |
816 | } | |
817 | break; | |
818 | case SCTP_DATA_LAST_FRAG: | |
819 | if (first_frag) | |
820 | goto out; | |
821 | break; | |
822 | default: | |
823 | break; | |
824 | } | |
825 | } | |
826 | ||
827 | if (!first_frag) | |
828 | return NULL; | |
829 | ||
830 | out: | |
831 | retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk), | |
832 | &ulpq->reasm_uo, first_frag, | |
833 | last_frag); | |
834 | if (retval) { | |
835 | sin->fsn_uo = next_fsn; | |
836 | sin->pd_mode_uo = 1; | |
837 | } | |
838 | ||
839 | return retval; | |
840 | } | |
841 | ||
bd4d627d XL |
842 | static int sctp_ulpevent_idata(struct sctp_ulpq *ulpq, |
843 | struct sctp_chunk *chunk, gfp_t gfp) | |
844 | { | |
845 | struct sctp_ulpevent *event; | |
846 | struct sk_buff_head temp; | |
847 | int event_eor = 0; | |
848 | ||
849 | event = sctp_ulpevent_make_rcvmsg(chunk->asoc, chunk, gfp); | |
850 | if (!event) | |
851 | return -ENOMEM; | |
852 | ||
853 | event->mid = ntohl(chunk->subh.idata_hdr->mid); | |
854 | if (event->msg_flags & SCTP_DATA_FIRST_FRAG) | |
855 | event->ppid = chunk->subh.idata_hdr->ppid; | |
856 | else | |
857 | event->fsn = ntohl(chunk->subh.idata_hdr->fsn); | |
858 | ||
13228238 XL |
859 | if (!(event->msg_flags & SCTP_DATA_UNORDERED)) { |
860 | event = sctp_intl_reasm(ulpq, event); | |
861 | if (event && event->msg_flags & MSG_EOR) { | |
862 | skb_queue_head_init(&temp); | |
863 | __skb_queue_tail(&temp, sctp_event2skb(event)); | |
bd4d627d | 864 | |
13228238 XL |
865 | event = sctp_intl_order(ulpq, event); |
866 | } | |
867 | } else { | |
868 | event = sctp_intl_reasm_uo(ulpq, event); | |
bd4d627d XL |
869 | } |
870 | ||
871 | if (event) { | |
872 | event_eor = (event->msg_flags & MSG_EOR) ? 1 : 0; | |
873 | sctp_enqueue_event(ulpq, event); | |
874 | } | |
875 | ||
876 | return event_eor; | |
877 | } | |
878 | ||
94014e8d XL |
879 | static struct sctp_ulpevent *sctp_intl_retrieve_first(struct sctp_ulpq *ulpq) |
880 | { | |
881 | struct sctp_stream_in *csin, *sin = NULL; | |
882 | struct sk_buff *first_frag = NULL; | |
883 | struct sk_buff *last_frag = NULL; | |
884 | struct sctp_ulpevent *retval; | |
885 | struct sk_buff *pos; | |
886 | __u32 next_fsn = 0; | |
887 | __u16 sid = 0; | |
888 | ||
889 | skb_queue_walk(&ulpq->reasm, pos) { | |
890 | struct sctp_ulpevent *cevent = sctp_skb2event(pos); | |
891 | ||
05364ca0 | 892 | csin = sctp_stream_in(&ulpq->asoc->stream, cevent->stream); |
94014e8d XL |
893 | if (csin->pd_mode) |
894 | continue; | |
895 | ||
896 | switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) { | |
897 | case SCTP_DATA_FIRST_FRAG: | |
898 | if (first_frag) | |
899 | goto out; | |
900 | if (cevent->mid == csin->mid) { | |
901 | first_frag = pos; | |
902 | last_frag = pos; | |
903 | next_fsn = 0; | |
904 | sin = csin; | |
905 | sid = cevent->stream; | |
906 | } | |
907 | break; | |
908 | case SCTP_DATA_MIDDLE_FRAG: | |
909 | if (!first_frag) | |
910 | break; | |
911 | if (cevent->stream == sid && | |
912 | cevent->mid == sin->mid && | |
913 | cevent->fsn == next_fsn) { | |
914 | next_fsn++; | |
915 | last_frag = pos; | |
916 | } else { | |
917 | goto out; | |
918 | } | |
919 | break; | |
920 | case SCTP_DATA_LAST_FRAG: | |
921 | if (first_frag) | |
922 | goto out; | |
923 | break; | |
924 | default: | |
925 | break; | |
926 | } | |
927 | } | |
928 | ||
929 | if (!first_frag) | |
930 | return NULL; | |
931 | ||
932 | out: | |
933 | retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk), | |
934 | &ulpq->reasm, first_frag, | |
935 | last_frag); | |
936 | if (retval) { | |
937 | sin->fsn = next_fsn; | |
938 | sin->pd_mode = 1; | |
939 | } | |
940 | ||
941 | return retval; | |
942 | } | |
943 | ||
944 | static void sctp_intl_start_pd(struct sctp_ulpq *ulpq, gfp_t gfp) | |
945 | { | |
946 | struct sctp_ulpevent *event; | |
947 | ||
13228238 XL |
948 | if (!skb_queue_empty(&ulpq->reasm)) { |
949 | do { | |
950 | event = sctp_intl_retrieve_first(ulpq); | |
951 | if (event) | |
952 | sctp_enqueue_event(ulpq, event); | |
953 | } while (event); | |
954 | } | |
94014e8d | 955 | |
13228238 XL |
956 | if (!skb_queue_empty(&ulpq->reasm_uo)) { |
957 | do { | |
958 | event = sctp_intl_retrieve_first_uo(ulpq); | |
959 | if (event) | |
960 | sctp_enqueue_event(ulpq, event); | |
961 | } while (event); | |
962 | } | |
94014e8d XL |
963 | } |
964 | ||
965 | static void sctp_renege_events(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk, | |
966 | gfp_t gfp) | |
967 | { | |
968 | struct sctp_association *asoc = ulpq->asoc; | |
969 | __u32 freed = 0; | |
970 | __u16 needed; | |
971 | ||
fb234035 XL |
972 | needed = ntohs(chunk->chunk_hdr->length) - |
973 | sizeof(struct sctp_idata_chunk); | |
94014e8d XL |
974 | |
975 | if (skb_queue_empty(&asoc->base.sk->sk_receive_queue)) { | |
976 | freed = sctp_ulpq_renege_list(ulpq, &ulpq->lobby, needed); | |
977 | if (freed < needed) | |
978 | freed += sctp_ulpq_renege_list(ulpq, &ulpq->reasm, | |
979 | needed); | |
13228238 XL |
980 | if (freed < needed) |
981 | freed += sctp_ulpq_renege_list(ulpq, &ulpq->reasm_uo, | |
982 | needed); | |
94014e8d XL |
983 | } |
984 | ||
9ab2323c XL |
985 | if (freed >= needed && sctp_ulpevent_idata(ulpq, chunk, gfp) <= 0) |
986 | sctp_intl_start_pd(ulpq, gfp); | |
94014e8d XL |
987 | |
988 | sk_mem_reclaim(asoc->base.sk); | |
989 | } | |
990 | ||
65f5e357 XL |
991 | static void sctp_intl_stream_abort_pd(struct sctp_ulpq *ulpq, __u16 sid, |
992 | __u32 mid, __u16 flags, gfp_t gfp) | |
993 | { | |
994 | struct sock *sk = ulpq->asoc->base.sk; | |
995 | struct sctp_ulpevent *ev = NULL; | |
996 | ||
a1e3a059 | 997 | if (!sctp_ulpevent_type_enabled(ulpq->asoc->subscribe, |
2cc0eeb6 | 998 | SCTP_PARTIAL_DELIVERY_EVENT)) |
65f5e357 XL |
999 | return; |
1000 | ||
1001 | ev = sctp_ulpevent_make_pdapi(ulpq->asoc, SCTP_PARTIAL_DELIVERY_ABORTED, | |
1002 | sid, mid, flags, gfp); | |
1003 | if (ev) { | |
a1e3a059 XL |
1004 | struct sctp_sock *sp = sctp_sk(sk); |
1005 | ||
65f5e357 XL |
1006 | __skb_queue_tail(&sk->sk_receive_queue, sctp_event2skb(ev)); |
1007 | ||
2cc0eeb6 XL |
1008 | if (!sp->data_ready_signalled) { |
1009 | sp->data_ready_signalled = 1; | |
65f5e357 XL |
1010 | sk->sk_data_ready(sk); |
1011 | } | |
1012 | } | |
1013 | } | |
1014 | ||
1015 | static void sctp_intl_reap_ordered(struct sctp_ulpq *ulpq, __u16 sid) | |
1016 | { | |
1017 | struct sctp_stream *stream = &ulpq->asoc->stream; | |
1018 | struct sctp_ulpevent *cevent, *event = NULL; | |
1019 | struct sk_buff_head *lobby = &ulpq->lobby; | |
1020 | struct sk_buff *pos, *tmp; | |
1021 | struct sk_buff_head temp; | |
1022 | __u16 csid; | |
1023 | __u32 cmid; | |
1024 | ||
1025 | skb_queue_head_init(&temp); | |
1026 | sctp_skb_for_each(pos, lobby, tmp) { | |
1027 | cevent = (struct sctp_ulpevent *)pos->cb; | |
1028 | csid = cevent->stream; | |
1029 | cmid = cevent->mid; | |
1030 | ||
1031 | if (csid > sid) | |
1032 | break; | |
1033 | ||
1034 | if (csid < sid) | |
1035 | continue; | |
1036 | ||
1037 | if (!MID_lt(cmid, sctp_mid_peek(stream, in, csid))) | |
1038 | break; | |
1039 | ||
1040 | __skb_unlink(pos, lobby); | |
1041 | if (!event) | |
1042 | event = sctp_skb2event(pos); | |
1043 | ||
1044 | __skb_queue_tail(&temp, pos); | |
1045 | } | |
1046 | ||
1047 | if (!event && pos != (struct sk_buff *)lobby) { | |
1048 | cevent = (struct sctp_ulpevent *)pos->cb; | |
1049 | csid = cevent->stream; | |
1050 | cmid = cevent->mid; | |
1051 | ||
1052 | if (csid == sid && cmid == sctp_mid_peek(stream, in, csid)) { | |
1053 | sctp_mid_next(stream, in, csid); | |
1054 | __skb_unlink(pos, lobby); | |
1055 | __skb_queue_tail(&temp, pos); | |
1056 | event = sctp_skb2event(pos); | |
1057 | } | |
1058 | } | |
1059 | ||
1060 | if (event) { | |
1061 | sctp_intl_retrieve_ordered(ulpq, event); | |
1062 | sctp_enqueue_event(ulpq, event); | |
1063 | } | |
1064 | } | |
1065 | ||
1066 | static void sctp_intl_abort_pd(struct sctp_ulpq *ulpq, gfp_t gfp) | |
1067 | { | |
1068 | struct sctp_stream *stream = &ulpq->asoc->stream; | |
1069 | __u16 sid; | |
1070 | ||
1071 | for (sid = 0; sid < stream->incnt; sid++) { | |
05364ca0 | 1072 | struct sctp_stream_in *sin = SCTP_SI(stream, sid); |
65f5e357 XL |
1073 | __u32 mid; |
1074 | ||
13228238 XL |
1075 | if (sin->pd_mode_uo) { |
1076 | sin->pd_mode_uo = 0; | |
1077 | ||
1078 | mid = sin->mid_uo; | |
1079 | sctp_intl_stream_abort_pd(ulpq, sid, mid, 0x1, gfp); | |
1080 | } | |
1081 | ||
65f5e357 XL |
1082 | if (sin->pd_mode) { |
1083 | sin->pd_mode = 0; | |
1084 | ||
1085 | mid = sin->mid; | |
1086 | sctp_intl_stream_abort_pd(ulpq, sid, mid, 0, gfp); | |
1087 | sctp_mid_skip(stream, in, sid, mid); | |
1088 | ||
1089 | sctp_intl_reap_ordered(ulpq, sid); | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | /* intl abort pd happens only when all data needs to be cleaned */ | |
1094 | sctp_ulpq_flush(ulpq); | |
1095 | } | |
1096 | ||
8e0c3b73 XL |
1097 | static inline int sctp_get_skip_pos(struct sctp_ifwdtsn_skip *skiplist, |
1098 | int nskips, __be16 stream, __u8 flags) | |
1099 | { | |
1100 | int i; | |
1101 | ||
1102 | for (i = 0; i < nskips; i++) | |
1103 | if (skiplist[i].stream == stream && | |
1104 | skiplist[i].flags == flags) | |
1105 | return i; | |
1106 | ||
1107 | return i; | |
1108 | } | |
1109 | ||
1110 | #define SCTP_FTSN_U_BIT 0x1 | |
1111 | static void sctp_generate_iftsn(struct sctp_outq *q, __u32 ctsn) | |
1112 | { | |
1113 | struct sctp_ifwdtsn_skip ftsn_skip_arr[10]; | |
1114 | struct sctp_association *asoc = q->asoc; | |
1115 | struct sctp_chunk *ftsn_chunk = NULL; | |
1116 | struct list_head *lchunk, *temp; | |
1117 | int nskips = 0, skip_pos; | |
1118 | struct sctp_chunk *chunk; | |
1119 | __u32 tsn; | |
1120 | ||
1121 | if (!asoc->peer.prsctp_capable) | |
1122 | return; | |
1123 | ||
1124 | if (TSN_lt(asoc->adv_peer_ack_point, ctsn)) | |
1125 | asoc->adv_peer_ack_point = ctsn; | |
1126 | ||
1127 | list_for_each_safe(lchunk, temp, &q->abandoned) { | |
1128 | chunk = list_entry(lchunk, struct sctp_chunk, transmitted_list); | |
1129 | tsn = ntohl(chunk->subh.data_hdr->tsn); | |
1130 | ||
1131 | if (TSN_lte(tsn, ctsn)) { | |
1132 | list_del_init(lchunk); | |
1133 | sctp_chunk_free(chunk); | |
1134 | } else if (TSN_lte(tsn, asoc->adv_peer_ack_point + 1)) { | |
1135 | __be16 sid = chunk->subh.idata_hdr->stream; | |
1136 | __be32 mid = chunk->subh.idata_hdr->mid; | |
1137 | __u8 flags = 0; | |
1138 | ||
1139 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) | |
1140 | flags |= SCTP_FTSN_U_BIT; | |
1141 | ||
1142 | asoc->adv_peer_ack_point = tsn; | |
1143 | skip_pos = sctp_get_skip_pos(&ftsn_skip_arr[0], nskips, | |
1144 | sid, flags); | |
1145 | ftsn_skip_arr[skip_pos].stream = sid; | |
1146 | ftsn_skip_arr[skip_pos].reserved = 0; | |
1147 | ftsn_skip_arr[skip_pos].flags = flags; | |
1148 | ftsn_skip_arr[skip_pos].mid = mid; | |
1149 | if (skip_pos == nskips) | |
1150 | nskips++; | |
1151 | if (nskips == 10) | |
1152 | break; | |
1153 | } else { | |
1154 | break; | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | if (asoc->adv_peer_ack_point > ctsn) | |
1159 | ftsn_chunk = sctp_make_ifwdtsn(asoc, asoc->adv_peer_ack_point, | |
1160 | nskips, &ftsn_skip_arr[0]); | |
1161 | ||
1162 | if (ftsn_chunk) { | |
1163 | list_add_tail(&ftsn_chunk->list, &q->control_chunk_list); | |
1164 | SCTP_INC_STATS(sock_net(asoc->base.sk), SCTP_MIB_OUTCTRLCHUNKS); | |
1165 | } | |
1166 | } | |
1167 | ||
0fc2ea92 XL |
1168 | #define _sctp_walk_ifwdtsn(pos, chunk, end) \ |
1169 | for (pos = chunk->subh.ifwdtsn_hdr->skip; \ | |
1170 | (void *)pos < (void *)chunk->subh.ifwdtsn_hdr->skip + (end); pos++) | |
1171 | ||
1172 | #define sctp_walk_ifwdtsn(pos, ch) \ | |
1173 | _sctp_walk_ifwdtsn((pos), (ch), ntohs((ch)->chunk_hdr->length) - \ | |
1174 | sizeof(struct sctp_ifwdtsn_chunk)) | |
1175 | ||
1176 | static bool sctp_validate_fwdtsn(struct sctp_chunk *chunk) | |
1177 | { | |
1178 | struct sctp_fwdtsn_skip *skip; | |
1179 | __u16 incnt; | |
1180 | ||
1181 | if (chunk->chunk_hdr->type != SCTP_CID_FWD_TSN) | |
1182 | return false; | |
1183 | ||
1184 | incnt = chunk->asoc->stream.incnt; | |
1185 | sctp_walk_fwdtsn(skip, chunk) | |
1186 | if (ntohs(skip->stream) >= incnt) | |
1187 | return false; | |
1188 | ||
1189 | return true; | |
1190 | } | |
1191 | ||
1192 | static bool sctp_validate_iftsn(struct sctp_chunk *chunk) | |
1193 | { | |
1194 | struct sctp_ifwdtsn_skip *skip; | |
1195 | __u16 incnt; | |
1196 | ||
1197 | if (chunk->chunk_hdr->type != SCTP_CID_I_FWD_TSN) | |
1198 | return false; | |
1199 | ||
1200 | incnt = chunk->asoc->stream.incnt; | |
1201 | sctp_walk_ifwdtsn(skip, chunk) | |
1202 | if (ntohs(skip->stream) >= incnt) | |
1203 | return false; | |
1204 | ||
1205 | return true; | |
1206 | } | |
1207 | ||
47b20a88 XL |
1208 | static void sctp_report_fwdtsn(struct sctp_ulpq *ulpq, __u32 ftsn) |
1209 | { | |
1210 | /* Move the Cumulattive TSN Ack ahead. */ | |
1211 | sctp_tsnmap_skip(&ulpq->asoc->peer.tsn_map, ftsn); | |
1212 | /* purge the fragmentation queue */ | |
1213 | sctp_ulpq_reasm_flushtsn(ulpq, ftsn); | |
1214 | /* Abort any in progress partial delivery. */ | |
1215 | sctp_ulpq_abort_pd(ulpq, GFP_ATOMIC); | |
1216 | } | |
1217 | ||
1218 | static void sctp_intl_reasm_flushtsn(struct sctp_ulpq *ulpq, __u32 ftsn) | |
1219 | { | |
1220 | struct sk_buff *pos, *tmp; | |
1221 | ||
1222 | skb_queue_walk_safe(&ulpq->reasm, pos, tmp) { | |
1223 | struct sctp_ulpevent *event = sctp_skb2event(pos); | |
1224 | __u32 tsn = event->tsn; | |
1225 | ||
1226 | if (TSN_lte(tsn, ftsn)) { | |
1227 | __skb_unlink(pos, &ulpq->reasm); | |
1228 | sctp_ulpevent_free(event); | |
1229 | } | |
1230 | } | |
1231 | ||
1232 | skb_queue_walk_safe(&ulpq->reasm_uo, pos, tmp) { | |
1233 | struct sctp_ulpevent *event = sctp_skb2event(pos); | |
1234 | __u32 tsn = event->tsn; | |
1235 | ||
1236 | if (TSN_lte(tsn, ftsn)) { | |
1237 | __skb_unlink(pos, &ulpq->reasm_uo); | |
1238 | sctp_ulpevent_free(event); | |
1239 | } | |
1240 | } | |
1241 | } | |
1242 | ||
1243 | static void sctp_report_iftsn(struct sctp_ulpq *ulpq, __u32 ftsn) | |
1244 | { | |
1245 | /* Move the Cumulattive TSN Ack ahead. */ | |
1246 | sctp_tsnmap_skip(&ulpq->asoc->peer.tsn_map, ftsn); | |
1247 | /* purge the fragmentation queue */ | |
1248 | sctp_intl_reasm_flushtsn(ulpq, ftsn); | |
1249 | /* abort only when it's for all data */ | |
1250 | if (ftsn == sctp_tsnmap_get_max_tsn_seen(&ulpq->asoc->peer.tsn_map)) | |
1251 | sctp_intl_abort_pd(ulpq, GFP_ATOMIC); | |
1252 | } | |
1253 | ||
de60fe91 XL |
1254 | static void sctp_handle_fwdtsn(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk) |
1255 | { | |
1256 | struct sctp_fwdtsn_skip *skip; | |
1257 | ||
1258 | /* Walk through all the skipped SSNs */ | |
1259 | sctp_walk_fwdtsn(skip, chunk) | |
1260 | sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn)); | |
1261 | } | |
1262 | ||
1263 | static void sctp_intl_skip(struct sctp_ulpq *ulpq, __u16 sid, __u32 mid, | |
1264 | __u8 flags) | |
1265 | { | |
05364ca0 | 1266 | struct sctp_stream_in *sin = sctp_stream_in(&ulpq->asoc->stream, sid); |
de60fe91 XL |
1267 | struct sctp_stream *stream = &ulpq->asoc->stream; |
1268 | ||
1269 | if (flags & SCTP_FTSN_U_BIT) { | |
1270 | if (sin->pd_mode_uo && MID_lt(sin->mid_uo, mid)) { | |
1271 | sin->pd_mode_uo = 0; | |
1272 | sctp_intl_stream_abort_pd(ulpq, sid, mid, 0x1, | |
1273 | GFP_ATOMIC); | |
1274 | } | |
1275 | return; | |
1276 | } | |
1277 | ||
1278 | if (MID_lt(mid, sctp_mid_peek(stream, in, sid))) | |
1279 | return; | |
1280 | ||
1281 | if (sin->pd_mode) { | |
1282 | sin->pd_mode = 0; | |
1283 | sctp_intl_stream_abort_pd(ulpq, sid, mid, 0x0, GFP_ATOMIC); | |
1284 | } | |
1285 | ||
1286 | sctp_mid_skip(stream, in, sid, mid); | |
1287 | ||
1288 | sctp_intl_reap_ordered(ulpq, sid); | |
1289 | } | |
1290 | ||
1291 | static void sctp_handle_iftsn(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk) | |
1292 | { | |
1293 | struct sctp_ifwdtsn_skip *skip; | |
1294 | ||
1295 | /* Walk through all the skipped MIDs and abort stream pd if possible */ | |
1296 | sctp_walk_ifwdtsn(skip, chunk) | |
1297 | sctp_intl_skip(ulpq, ntohs(skip->stream), | |
1298 | ntohl(skip->mid), skip->flags); | |
1299 | } | |
1300 | ||
0c3f6f65 XL |
1301 | static struct sctp_stream_interleave sctp_stream_interleave_0 = { |
1302 | .data_chunk_len = sizeof(struct sctp_data_chunk), | |
0fc2ea92 | 1303 | .ftsn_chunk_len = sizeof(struct sctp_fwdtsn_chunk), |
0c3f6f65 XL |
1304 | /* DATA process functions */ |
1305 | .make_datafrag = sctp_make_datafrag_empty, | |
668c9beb | 1306 | .assign_number = sctp_chunk_assign_ssn, |
9d4ceaf1 | 1307 | .validate_data = sctp_validate_data, |
bd4d627d | 1308 | .ulpevent_data = sctp_ulpq_tail_data, |
9162e0ed | 1309 | .enqueue_event = sctp_ulpq_tail_event, |
94014e8d | 1310 | .renege_events = sctp_ulpq_renege, |
be4e0ce1 | 1311 | .start_pd = sctp_ulpq_partial_delivery, |
65f5e357 | 1312 | .abort_pd = sctp_ulpq_abort_pd, |
8e0c3b73 XL |
1313 | /* FORWARD-TSN process functions */ |
1314 | .generate_ftsn = sctp_generate_fwdtsn, | |
0fc2ea92 | 1315 | .validate_ftsn = sctp_validate_fwdtsn, |
47b20a88 | 1316 | .report_ftsn = sctp_report_fwdtsn, |
de60fe91 | 1317 | .handle_ftsn = sctp_handle_fwdtsn, |
0c3f6f65 XL |
1318 | }; |
1319 | ||
1320 | static struct sctp_stream_interleave sctp_stream_interleave_1 = { | |
1321 | .data_chunk_len = sizeof(struct sctp_idata_chunk), | |
0fc2ea92 | 1322 | .ftsn_chunk_len = sizeof(struct sctp_ifwdtsn_chunk), |
0c3f6f65 XL |
1323 | /* I-DATA process functions */ |
1324 | .make_datafrag = sctp_make_idatafrag_empty, | |
668c9beb | 1325 | .assign_number = sctp_chunk_assign_mid, |
9d4ceaf1 | 1326 | .validate_data = sctp_validate_idata, |
bd4d627d | 1327 | .ulpevent_data = sctp_ulpevent_idata, |
9162e0ed | 1328 | .enqueue_event = sctp_enqueue_event, |
94014e8d | 1329 | .renege_events = sctp_renege_events, |
be4e0ce1 | 1330 | .start_pd = sctp_intl_start_pd, |
65f5e357 | 1331 | .abort_pd = sctp_intl_abort_pd, |
8e0c3b73 XL |
1332 | /* I-FORWARD-TSN process functions */ |
1333 | .generate_ftsn = sctp_generate_iftsn, | |
0fc2ea92 | 1334 | .validate_ftsn = sctp_validate_iftsn, |
47b20a88 | 1335 | .report_ftsn = sctp_report_iftsn, |
de60fe91 | 1336 | .handle_ftsn = sctp_handle_iftsn, |
0c3f6f65 XL |
1337 | }; |
1338 | ||
1339 | void sctp_stream_interleave_init(struct sctp_stream *stream) | |
1340 | { | |
1341 | struct sctp_association *asoc; | |
1342 | ||
1343 | asoc = container_of(stream, struct sctp_association, stream); | |
1344 | stream->si = asoc->intl_enable ? &sctp_stream_interleave_1 | |
1345 | : &sctp_stream_interleave_0; | |
1346 | } |