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13#include <linux/slab.h>
14#include "../feat.h"
15#include "ccid2.h"
16
17
18#ifdef CONFIG_IP_DCCP_CCID2_DEBUG
19static bool ccid2_debug;
20#define ccid2_pr_debug(format, a...) DCCP_PR_DEBUG(ccid2_debug, format, ##a)
21#else
22#define ccid2_pr_debug(format, a...)
23#endif
24
25static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hc)
26{
27 struct ccid2_seq *seqp;
28 int i;
29
30
31 if (hc->tx_seqbufc >= (sizeof(hc->tx_seqbuf) /
32 sizeof(struct ccid2_seq *)))
33 return -ENOMEM;
34
35
36 seqp = kmalloc_array(CCID2_SEQBUF_LEN, sizeof(struct ccid2_seq),
37 gfp_any());
38 if (seqp == NULL)
39 return -ENOMEM;
40
41 for (i = 0; i < (CCID2_SEQBUF_LEN - 1); i++) {
42 seqp[i].ccid2s_next = &seqp[i + 1];
43 seqp[i + 1].ccid2s_prev = &seqp[i];
44 }
45 seqp[CCID2_SEQBUF_LEN - 1].ccid2s_next = seqp;
46 seqp->ccid2s_prev = &seqp[CCID2_SEQBUF_LEN - 1];
47
48
49 if (hc->tx_seqbufc == 0)
50 hc->tx_seqh = hc->tx_seqt = seqp;
51 else {
52
53 hc->tx_seqh->ccid2s_next = seqp;
54 seqp->ccid2s_prev = hc->tx_seqh;
55
56 hc->tx_seqt->ccid2s_prev = &seqp[CCID2_SEQBUF_LEN - 1];
57 seqp[CCID2_SEQBUF_LEN - 1].ccid2s_next = hc->tx_seqt;
58 }
59
60
61 hc->tx_seqbuf[hc->tx_seqbufc] = seqp;
62 hc->tx_seqbufc++;
63
64 return 0;
65}
66
67static int ccid2_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
68{
69 if (ccid2_cwnd_network_limited(ccid2_hc_tx_sk(sk)))
70 return CCID_PACKET_WILL_DEQUEUE_LATER;
71 return CCID_PACKET_SEND_AT_ONCE;
72}
73
74static void ccid2_change_l_ack_ratio(struct sock *sk, u32 val)
75{
76 u32 max_ratio = DIV_ROUND_UP(ccid2_hc_tx_sk(sk)->tx_cwnd, 2);
77
78
79
80
81
82
83
84 if (val == 0 || val > max_ratio) {
85 DCCP_WARN("Limiting Ack Ratio (%u) to %u\n", val, max_ratio);
86 val = max_ratio;
87 }
88 dccp_feat_signal_nn_change(sk, DCCPF_ACK_RATIO,
89 min_t(u32, val, DCCPF_ACK_RATIO_MAX));
90}
91
92static void ccid2_check_l_ack_ratio(struct sock *sk)
93{
94 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
95
96
97
98
99
100
101
102
103
104
105
106 if (dccp_feat_nn_get(sk, DCCPF_ACK_RATIO) > hc->tx_cwnd)
107 ccid2_change_l_ack_ratio(sk, hc->tx_cwnd/2 ? : 1U);
108}
109
110static void ccid2_change_l_seq_window(struct sock *sk, u64 val)
111{
112 dccp_feat_signal_nn_change(sk, DCCPF_SEQUENCE_WINDOW,
113 clamp_val(val, DCCPF_SEQ_WMIN,
114 DCCPF_SEQ_WMAX));
115}
116
117static void dccp_tasklet_schedule(struct sock *sk)
118{
119 struct tasklet_struct *t = &dccp_sk(sk)->dccps_xmitlet;
120
121 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) {
122 sock_hold(sk);
123 __tasklet_schedule(t);
124 }
125}
126
127static void ccid2_hc_tx_rto_expire(struct timer_list *t)
128{
129 struct ccid2_hc_tx_sock *hc = from_timer(hc, t, tx_rtotimer);
130 struct sock *sk = hc->sk;
131 const bool sender_was_blocked = ccid2_cwnd_network_limited(hc);
132
133 bh_lock_sock(sk);
134 if (sock_owned_by_user(sk)) {
135 sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + HZ / 5);
136 goto out;
137 }
138
139 ccid2_pr_debug("RTO_EXPIRE\n");
140
141 if (sk->sk_state == DCCP_CLOSED)
142 goto out;
143
144
145 hc->tx_rto <<= 1;
146 if (hc->tx_rto > DCCP_RTO_MAX)
147 hc->tx_rto = DCCP_RTO_MAX;
148
149
150 hc->tx_ssthresh = hc->tx_cwnd / 2;
151 if (hc->tx_ssthresh < 2)
152 hc->tx_ssthresh = 2;
153 hc->tx_cwnd = 1;
154 hc->tx_pipe = 0;
155
156
157 hc->tx_seqt = hc->tx_seqh;
158 hc->tx_packets_acked = 0;
159
160
161 hc->tx_rpseq = 0;
162 hc->tx_rpdupack = -1;
163 ccid2_change_l_ack_ratio(sk, 1);
164
165
166 if (sender_was_blocked)
167 dccp_tasklet_schedule(sk);
168
169 sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + hc->tx_rto);
170out:
171 bh_unlock_sock(sk);
172 sock_put(sk);
173}
174
175
176
177
178static bool ccid2_do_cwv = true;
179module_param(ccid2_do_cwv, bool, 0644);
180MODULE_PARM_DESC(ccid2_do_cwv, "Perform RFC2861 Congestion Window Validation");
181
182
183
184
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186
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189
190
191
192static void ccid2_update_used_window(struct ccid2_hc_tx_sock *hc, u32 new_wnd)
193{
194 hc->tx_expected_wnd = (3 * hc->tx_expected_wnd + new_wnd) / 4;
195}
196
197
198static void ccid2_cwnd_application_limited(struct sock *sk, const u32 now)
199{
200 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
201
202 u32 init_win = rfc3390_bytes_to_packets(dccp_sk(sk)->dccps_mss_cache),
203 win_used = max(hc->tx_cwnd_used, init_win);
204
205 if (win_used < hc->tx_cwnd) {
206 hc->tx_ssthresh = max(hc->tx_ssthresh,
207 (hc->tx_cwnd >> 1) + (hc->tx_cwnd >> 2));
208 hc->tx_cwnd = (hc->tx_cwnd + win_used) >> 1;
209 }
210 hc->tx_cwnd_used = 0;
211 hc->tx_cwnd_stamp = now;
212
213 ccid2_check_l_ack_ratio(sk);
214}
215
216
217static void ccid2_cwnd_restart(struct sock *sk, const u32 now)
218{
219 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
220 u32 cwnd = hc->tx_cwnd, restart_cwnd,
221 iwnd = rfc3390_bytes_to_packets(dccp_sk(sk)->dccps_mss_cache);
222 s32 delta = now - hc->tx_lsndtime;
223
224 hc->tx_ssthresh = max(hc->tx_ssthresh, (cwnd >> 1) + (cwnd >> 2));
225
226
227 restart_cwnd = min(cwnd, iwnd);
228
229 while ((delta -= hc->tx_rto) >= 0 && cwnd > restart_cwnd)
230 cwnd >>= 1;
231 hc->tx_cwnd = max(cwnd, restart_cwnd);
232 hc->tx_cwnd_stamp = now;
233 hc->tx_cwnd_used = 0;
234
235 ccid2_check_l_ack_ratio(sk);
236}
237
238static void ccid2_hc_tx_packet_sent(struct sock *sk, unsigned int len)
239{
240 struct dccp_sock *dp = dccp_sk(sk);
241 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
242 const u32 now = ccid2_jiffies32;
243 struct ccid2_seq *next;
244
245
246 if (ccid2_do_cwv && !hc->tx_pipe &&
247 (s32)(now - hc->tx_lsndtime) >= hc->tx_rto)
248 ccid2_cwnd_restart(sk, now);
249
250 hc->tx_lsndtime = now;
251 hc->tx_pipe += 1;
252
253
254 if (ccid2_cwnd_network_limited(hc)) {
255 ccid2_update_used_window(hc, hc->tx_cwnd);
256 hc->tx_cwnd_used = 0;
257 hc->tx_cwnd_stamp = now;
258 } else {
259 if (hc->tx_pipe > hc->tx_cwnd_used)
260 hc->tx_cwnd_used = hc->tx_pipe;
261
262 ccid2_update_used_window(hc, hc->tx_cwnd_used);
263
264 if (ccid2_do_cwv && (s32)(now - hc->tx_cwnd_stamp) >= hc->tx_rto)
265 ccid2_cwnd_application_limited(sk, now);
266 }
267
268 hc->tx_seqh->ccid2s_seq = dp->dccps_gss;
269 hc->tx_seqh->ccid2s_acked = 0;
270 hc->tx_seqh->ccid2s_sent = now;
271
272 next = hc->tx_seqh->ccid2s_next;
273
274 if (next == hc->tx_seqt) {
275 if (ccid2_hc_tx_alloc_seq(hc)) {
276 DCCP_CRIT("packet history - out of memory!");
277
278 return;
279 }
280 next = hc->tx_seqh->ccid2s_next;
281 BUG_ON(next == hc->tx_seqt);
282 }
283 hc->tx_seqh = next;
284
285 ccid2_pr_debug("cwnd=%d pipe=%d\n", hc->tx_cwnd, hc->tx_pipe);
286
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303
304
305
306#if 0
307
308 hc->tx_arsent++;
309
310 if (hc->tx_ackloss) {
311 if (hc->tx_arsent >= hc->tx_cwnd) {
312 hc->tx_arsent = 0;
313 hc->tx_ackloss = 0;
314 }
315 } else {
316
317
318 if (dp->dccps_l_ack_ratio > 1) {
319
320 int denom = dp->dccps_l_ack_ratio * dp->dccps_l_ack_ratio -
321 dp->dccps_l_ack_ratio;
322
323 denom = hc->tx_cwnd * hc->tx_cwnd / denom;
324
325 if (hc->tx_arsent >= denom) {
326 ccid2_change_l_ack_ratio(sk, dp->dccps_l_ack_ratio - 1);
327 hc->tx_arsent = 0;
328 }
329 } else {
330
331 hc->tx_arsent = 0;
332 }
333 }
334#endif
335
336 sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + hc->tx_rto);
337
338#ifdef CONFIG_IP_DCCP_CCID2_DEBUG
339 do {
340 struct ccid2_seq *seqp = hc->tx_seqt;
341
342 while (seqp != hc->tx_seqh) {
343 ccid2_pr_debug("out seq=%llu acked=%d time=%u\n",
344 (unsigned long long)seqp->ccid2s_seq,
345 seqp->ccid2s_acked, seqp->ccid2s_sent);
346 seqp = seqp->ccid2s_next;
347 }
348 } while (0);
349 ccid2_pr_debug("=========\n");
350#endif
351}
352
353
354
355
356
357
358
359
360
361
362
363
364static void ccid2_rtt_estimator(struct sock *sk, const long mrtt)
365{
366 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
367 long m = mrtt ? : 1;
368
369 if (hc->tx_srtt == 0) {
370
371 hc->tx_srtt = m << 3;
372 hc->tx_mdev = m << 1;
373
374 hc->tx_mdev_max = max(hc->tx_mdev, tcp_rto_min(sk));
375 hc->tx_rttvar = hc->tx_mdev_max;
376
377 hc->tx_rtt_seq = dccp_sk(sk)->dccps_gss;
378 } else {
379
380 m -= (hc->tx_srtt >> 3);
381 hc->tx_srtt += m;
382
383
384 if (m < 0) {
385 m = -m;
386 m -= (hc->tx_mdev >> 2);
387
388
389
390
391
392 if (m > 0)
393 m >>= 3;
394 } else {
395 m -= (hc->tx_mdev >> 2);
396 }
397 hc->tx_mdev += m;
398
399 if (hc->tx_mdev > hc->tx_mdev_max) {
400 hc->tx_mdev_max = hc->tx_mdev;
401 if (hc->tx_mdev_max > hc->tx_rttvar)
402 hc->tx_rttvar = hc->tx_mdev_max;
403 }
404
405
406
407
408
409
410
411
412 if (after48(dccp_sk(sk)->dccps_gar, hc->tx_rtt_seq)) {
413 if (hc->tx_mdev_max < hc->tx_rttvar)
414 hc->tx_rttvar -= (hc->tx_rttvar -
415 hc->tx_mdev_max) >> 2;
416 hc->tx_rtt_seq = dccp_sk(sk)->dccps_gss;
417 hc->tx_mdev_max = tcp_rto_min(sk);
418 }
419 }
420
421
422
423
424
425
426
427
428 hc->tx_rto = (hc->tx_srtt >> 3) + hc->tx_rttvar;
429
430 if (hc->tx_rto > DCCP_RTO_MAX)
431 hc->tx_rto = DCCP_RTO_MAX;
432}
433
434static void ccid2_new_ack(struct sock *sk, struct ccid2_seq *seqp,
435 unsigned int *maxincr)
436{
437 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
438 struct dccp_sock *dp = dccp_sk(sk);
439 int r_seq_used = hc->tx_cwnd / dp->dccps_l_ack_ratio;
440
441 if (hc->tx_cwnd < dp->dccps_l_seq_win &&
442 r_seq_used < dp->dccps_r_seq_win) {
443 if (hc->tx_cwnd < hc->tx_ssthresh) {
444 if (*maxincr > 0 && ++hc->tx_packets_acked >= 2) {
445 hc->tx_cwnd += 1;
446 *maxincr -= 1;
447 hc->tx_packets_acked = 0;
448 }
449 } else if (++hc->tx_packets_acked >= hc->tx_cwnd) {
450 hc->tx_cwnd += 1;
451 hc->tx_packets_acked = 0;
452 }
453 }
454
455
456
457
458
459 if (r_seq_used * CCID2_WIN_CHANGE_FACTOR >= dp->dccps_r_seq_win)
460 ccid2_change_l_ack_ratio(sk, dp->dccps_l_ack_ratio * 2);
461 else if (r_seq_used * CCID2_WIN_CHANGE_FACTOR < dp->dccps_r_seq_win/2)
462 ccid2_change_l_ack_ratio(sk, dp->dccps_l_ack_ratio / 2 ? : 1U);
463
464 if (hc->tx_cwnd * CCID2_WIN_CHANGE_FACTOR >= dp->dccps_l_seq_win)
465 ccid2_change_l_seq_window(sk, dp->dccps_l_seq_win * 2);
466 else if (hc->tx_cwnd * CCID2_WIN_CHANGE_FACTOR < dp->dccps_l_seq_win/2)
467 ccid2_change_l_seq_window(sk, dp->dccps_l_seq_win / 2);
468
469
470
471
472
473
474
475
476
477 ccid2_rtt_estimator(sk, ccid2_jiffies32 - seqp->ccid2s_sent);
478}
479
480static void ccid2_congestion_event(struct sock *sk, struct ccid2_seq *seqp)
481{
482 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
483
484 if ((s32)(seqp->ccid2s_sent - hc->tx_last_cong) < 0) {
485 ccid2_pr_debug("Multiple losses in an RTT---treating as one\n");
486 return;
487 }
488
489 hc->tx_last_cong = ccid2_jiffies32;
490
491 hc->tx_cwnd = hc->tx_cwnd / 2 ? : 1U;
492 hc->tx_ssthresh = max(hc->tx_cwnd, 2U);
493
494 ccid2_check_l_ack_ratio(sk);
495}
496
497static int ccid2_hc_tx_parse_options(struct sock *sk, u8 packet_type,
498 u8 option, u8 *optval, u8 optlen)
499{
500 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
501
502 switch (option) {
503 case DCCPO_ACK_VECTOR_0:
504 case DCCPO_ACK_VECTOR_1:
505 return dccp_ackvec_parsed_add(&hc->tx_av_chunks, optval, optlen,
506 option - DCCPO_ACK_VECTOR_0);
507 }
508 return 0;
509}
510
511static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
512{
513 struct dccp_sock *dp = dccp_sk(sk);
514 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
515 const bool sender_was_blocked = ccid2_cwnd_network_limited(hc);
516 struct dccp_ackvec_parsed *avp;
517 u64 ackno, seqno;
518 struct ccid2_seq *seqp;
519 int done = 0;
520 unsigned int maxincr = 0;
521
522
523 seqno = DCCP_SKB_CB(skb)->dccpd_seq;
524
525
526
527
528
529
530 if (hc->tx_rpdupack == -1) {
531 hc->tx_rpdupack = 0;
532 hc->tx_rpseq = seqno;
533 } else {
534
535 if (dccp_delta_seqno(hc->tx_rpseq, seqno) == 1)
536 hc->tx_rpseq = seqno;
537
538 else if (after48(seqno, hc->tx_rpseq)) {
539 hc->tx_rpdupack++;
540
541
542 if (hc->tx_rpdupack >= NUMDUPACK) {
543 hc->tx_rpdupack = -1;
544 hc->tx_rpseq = 0;
545#ifdef __CCID2_COPES_GRACEFULLY_WITH_ACK_CONGESTION_CONTROL__
546
547
548
549
550
551
552
553 ccid2_change_l_ack_ratio(sk, 2 * dp->dccps_l_ack_ratio);
554#endif
555 }
556 }
557 }
558
559
560 if (dccp_packet_without_ack(skb))
561 return;
562
563
564 if (hc->tx_seqh == hc->tx_seqt)
565 goto done;
566
567 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq;
568 if (after48(ackno, hc->tx_high_ack))
569 hc->tx_high_ack = ackno;
570
571 seqp = hc->tx_seqt;
572 while (before48(seqp->ccid2s_seq, ackno)) {
573 seqp = seqp->ccid2s_next;
574 if (seqp == hc->tx_seqh) {
575 seqp = hc->tx_seqh->ccid2s_prev;
576 break;
577 }
578 }
579
580
581
582
583
584
585 if (hc->tx_cwnd < hc->tx_ssthresh)
586 maxincr = DIV_ROUND_UP(dp->dccps_l_ack_ratio, 2);
587
588
589 list_for_each_entry(avp, &hc->tx_av_chunks, node) {
590
591 for (; avp->len--; avp->vec++) {
592 u64 ackno_end_rl = SUB48(ackno,
593 dccp_ackvec_runlen(avp->vec));
594
595 ccid2_pr_debug("ackvec %llu |%u,%u|\n",
596 (unsigned long long)ackno,
597 dccp_ackvec_state(avp->vec) >> 6,
598 dccp_ackvec_runlen(avp->vec));
599
600
601
602
603 while (after48(seqp->ccid2s_seq, ackno)) {
604 if (seqp == hc->tx_seqt) {
605 done = 1;
606 break;
607 }
608 seqp = seqp->ccid2s_prev;
609 }
610 if (done)
611 break;
612
613
614
615
616 while (between48(seqp->ccid2s_seq,ackno_end_rl,ackno)) {
617 const u8 state = dccp_ackvec_state(avp->vec);
618
619
620 if (state != DCCPAV_NOT_RECEIVED &&
621 !seqp->ccid2s_acked) {
622 if (state == DCCPAV_ECN_MARKED)
623 ccid2_congestion_event(sk,
624 seqp);
625 else
626 ccid2_new_ack(sk, seqp,
627 &maxincr);
628
629 seqp->ccid2s_acked = 1;
630 ccid2_pr_debug("Got ack for %llu\n",
631 (unsigned long long)seqp->ccid2s_seq);
632 hc->tx_pipe--;
633 }
634 if (seqp == hc->tx_seqt) {
635 done = 1;
636 break;
637 }
638 seqp = seqp->ccid2s_prev;
639 }
640 if (done)
641 break;
642
643 ackno = SUB48(ackno_end_rl, 1);
644 }
645 if (done)
646 break;
647 }
648
649
650
651
652 seqp = hc->tx_seqt;
653 while (before48(seqp->ccid2s_seq, hc->tx_high_ack)) {
654 seqp = seqp->ccid2s_next;
655 if (seqp == hc->tx_seqh) {
656 seqp = hc->tx_seqh->ccid2s_prev;
657 break;
658 }
659 }
660 done = 0;
661 while (1) {
662 if (seqp->ccid2s_acked) {
663 done++;
664 if (done == NUMDUPACK)
665 break;
666 }
667 if (seqp == hc->tx_seqt)
668 break;
669 seqp = seqp->ccid2s_prev;
670 }
671
672
673
674
675 if (done == NUMDUPACK) {
676 struct ccid2_seq *last_acked = seqp;
677
678
679 while (1) {
680 if (!seqp->ccid2s_acked) {
681 ccid2_pr_debug("Packet lost: %llu\n",
682 (unsigned long long)seqp->ccid2s_seq);
683
684
685
686
687 ccid2_congestion_event(sk, seqp);
688 hc->tx_pipe--;
689 }
690 if (seqp == hc->tx_seqt)
691 break;
692 seqp = seqp->ccid2s_prev;
693 }
694
695 hc->tx_seqt = last_acked;
696 }
697
698
699 while (hc->tx_seqt != hc->tx_seqh) {
700 if (!hc->tx_seqt->ccid2s_acked)
701 break;
702
703 hc->tx_seqt = hc->tx_seqt->ccid2s_next;
704 }
705
706
707 if (hc->tx_pipe == 0)
708 sk_stop_timer(sk, &hc->tx_rtotimer);
709 else
710 sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + hc->tx_rto);
711done:
712
713 if (sender_was_blocked && !ccid2_cwnd_network_limited(hc))
714 dccp_tasklet_schedule(sk);
715 dccp_ackvec_parsed_cleanup(&hc->tx_av_chunks);
716}
717
718static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
719{
720 struct ccid2_hc_tx_sock *hc = ccid_priv(ccid);
721 struct dccp_sock *dp = dccp_sk(sk);
722 u32 max_ratio;
723
724
725 hc->tx_ssthresh = ~0U;
726
727
728 hc->tx_cwnd = rfc3390_bytes_to_packets(dp->dccps_mss_cache);
729 hc->tx_expected_wnd = hc->tx_cwnd;
730
731
732 max_ratio = DIV_ROUND_UP(hc->tx_cwnd, 2);
733 if (dp->dccps_l_ack_ratio == 0 || dp->dccps_l_ack_ratio > max_ratio)
734 dp->dccps_l_ack_ratio = max_ratio;
735
736
737 if (ccid2_hc_tx_alloc_seq(hc))
738 return -ENOMEM;
739
740 hc->tx_rto = DCCP_TIMEOUT_INIT;
741 hc->tx_rpdupack = -1;
742 hc->tx_last_cong = hc->tx_lsndtime = hc->tx_cwnd_stamp = ccid2_jiffies32;
743 hc->tx_cwnd_used = 0;
744 hc->sk = sk;
745 timer_setup(&hc->tx_rtotimer, ccid2_hc_tx_rto_expire, 0);
746 INIT_LIST_HEAD(&hc->tx_av_chunks);
747 return 0;
748}
749
750static void ccid2_hc_tx_exit(struct sock *sk)
751{
752 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
753 int i;
754
755 sk_stop_timer(sk, &hc->tx_rtotimer);
756
757 for (i = 0; i < hc->tx_seqbufc; i++)
758 kfree(hc->tx_seqbuf[i]);
759 hc->tx_seqbufc = 0;
760 dccp_ackvec_parsed_cleanup(&hc->tx_av_chunks);
761}
762
763static void ccid2_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
764{
765 struct ccid2_hc_rx_sock *hc = ccid2_hc_rx_sk(sk);
766
767 if (!dccp_data_packet(skb))
768 return;
769
770 if (++hc->rx_num_data_pkts >= dccp_sk(sk)->dccps_r_ack_ratio) {
771 dccp_send_ack(sk);
772 hc->rx_num_data_pkts = 0;
773 }
774}
775
776struct ccid_operations ccid2_ops = {
777 .ccid_id = DCCPC_CCID2,
778 .ccid_name = "TCP-like",
779 .ccid_hc_tx_obj_size = sizeof(struct ccid2_hc_tx_sock),
780 .ccid_hc_tx_init = ccid2_hc_tx_init,
781 .ccid_hc_tx_exit = ccid2_hc_tx_exit,
782 .ccid_hc_tx_send_packet = ccid2_hc_tx_send_packet,
783 .ccid_hc_tx_packet_sent = ccid2_hc_tx_packet_sent,
784 .ccid_hc_tx_parse_options = ccid2_hc_tx_parse_options,
785 .ccid_hc_tx_packet_recv = ccid2_hc_tx_packet_recv,
786 .ccid_hc_rx_obj_size = sizeof(struct ccid2_hc_rx_sock),
787 .ccid_hc_rx_packet_recv = ccid2_hc_rx_packet_recv,
788};
789
790#ifdef CONFIG_IP_DCCP_CCID2_DEBUG
791module_param(ccid2_debug, bool, 0644);
792MODULE_PARM_DESC(ccid2_debug, "Enable CCID-2 debug messages");
793#endif
794