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25
26#include <linux/slab.h>
27#include "../feat.h"
28#include "ccid2.h"
29
30
31#ifdef CONFIG_IP_DCCP_CCID2_DEBUG
32static bool ccid2_debug;
33#define ccid2_pr_debug(format, a...) DCCP_PR_DEBUG(ccid2_debug, format, ##a)
34#else
35#define ccid2_pr_debug(format, a...)
36#endif
37
38static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hc)
39{
40 struct ccid2_seq *seqp;
41 int i;
42
43
44 if (hc->tx_seqbufc >= (sizeof(hc->tx_seqbuf) /
45 sizeof(struct ccid2_seq *)))
46 return -ENOMEM;
47
48
49 seqp = kmalloc_array(CCID2_SEQBUF_LEN, sizeof(struct ccid2_seq),
50 gfp_any());
51 if (seqp == NULL)
52 return -ENOMEM;
53
54 for (i = 0; i < (CCID2_SEQBUF_LEN - 1); i++) {
55 seqp[i].ccid2s_next = &seqp[i + 1];
56 seqp[i + 1].ccid2s_prev = &seqp[i];
57 }
58 seqp[CCID2_SEQBUF_LEN - 1].ccid2s_next = seqp;
59 seqp->ccid2s_prev = &seqp[CCID2_SEQBUF_LEN - 1];
60
61
62 if (hc->tx_seqbufc == 0)
63 hc->tx_seqh = hc->tx_seqt = seqp;
64 else {
65
66 hc->tx_seqh->ccid2s_next = seqp;
67 seqp->ccid2s_prev = hc->tx_seqh;
68
69 hc->tx_seqt->ccid2s_prev = &seqp[CCID2_SEQBUF_LEN - 1];
70 seqp[CCID2_SEQBUF_LEN - 1].ccid2s_next = hc->tx_seqt;
71 }
72
73
74 hc->tx_seqbuf[hc->tx_seqbufc] = seqp;
75 hc->tx_seqbufc++;
76
77 return 0;
78}
79
80static int ccid2_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
81{
82 if (ccid2_cwnd_network_limited(ccid2_hc_tx_sk(sk)))
83 return CCID_PACKET_WILL_DEQUEUE_LATER;
84 return CCID_PACKET_SEND_AT_ONCE;
85}
86
87static void ccid2_change_l_ack_ratio(struct sock *sk, u32 val)
88{
89 u32 max_ratio = DIV_ROUND_UP(ccid2_hc_tx_sk(sk)->tx_cwnd, 2);
90
91
92
93
94
95
96
97 if (val == 0 || val > max_ratio) {
98 DCCP_WARN("Limiting Ack Ratio (%u) to %u\n", val, max_ratio);
99 val = max_ratio;
100 }
101 dccp_feat_signal_nn_change(sk, DCCPF_ACK_RATIO,
102 min_t(u32, val, DCCPF_ACK_RATIO_MAX));
103}
104
105static void ccid2_check_l_ack_ratio(struct sock *sk)
106{
107 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
108
109
110
111
112
113
114
115
116
117
118
119 if (dccp_feat_nn_get(sk, DCCPF_ACK_RATIO) > hc->tx_cwnd)
120 ccid2_change_l_ack_ratio(sk, hc->tx_cwnd/2 ? : 1U);
121}
122
123static void ccid2_change_l_seq_window(struct sock *sk, u64 val)
124{
125 dccp_feat_signal_nn_change(sk, DCCPF_SEQUENCE_WINDOW,
126 clamp_val(val, DCCPF_SEQ_WMIN,
127 DCCPF_SEQ_WMAX));
128}
129
130static void dccp_tasklet_schedule(struct sock *sk)
131{
132 struct tasklet_struct *t = &dccp_sk(sk)->dccps_xmitlet;
133
134 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) {
135 sock_hold(sk);
136 __tasklet_schedule(t);
137 }
138}
139
140static void ccid2_hc_tx_rto_expire(struct timer_list *t)
141{
142 struct ccid2_hc_tx_sock *hc = from_timer(hc, t, tx_rtotimer);
143 struct sock *sk = hc->sk;
144 const bool sender_was_blocked = ccid2_cwnd_network_limited(hc);
145
146 bh_lock_sock(sk);
147 if (sock_owned_by_user(sk)) {
148 sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + HZ / 5);
149 goto out;
150 }
151
152 ccid2_pr_debug("RTO_EXPIRE\n");
153
154 if (sk->sk_state == DCCP_CLOSED)
155 goto out;
156
157
158 hc->tx_rto <<= 1;
159 if (hc->tx_rto > DCCP_RTO_MAX)
160 hc->tx_rto = DCCP_RTO_MAX;
161
162
163 hc->tx_ssthresh = hc->tx_cwnd / 2;
164 if (hc->tx_ssthresh < 2)
165 hc->tx_ssthresh = 2;
166 hc->tx_cwnd = 1;
167 hc->tx_pipe = 0;
168
169
170 hc->tx_seqt = hc->tx_seqh;
171 hc->tx_packets_acked = 0;
172
173
174 hc->tx_rpseq = 0;
175 hc->tx_rpdupack = -1;
176 ccid2_change_l_ack_ratio(sk, 1);
177
178
179 if (sender_was_blocked)
180 dccp_tasklet_schedule(sk);
181
182 sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + hc->tx_rto);
183out:
184 bh_unlock_sock(sk);
185 sock_put(sk);
186}
187
188
189
190
191static bool ccid2_do_cwv = true;
192module_param(ccid2_do_cwv, bool, 0644);
193MODULE_PARM_DESC(ccid2_do_cwv, "Perform RFC2861 Congestion Window Validation");
194
195
196
197
198
199
200
201
202static void ccid2_update_used_window(struct ccid2_hc_tx_sock *hc, u32 new_wnd)
203{
204 hc->tx_expected_wnd = (3 * hc->tx_expected_wnd + new_wnd) / 4;
205}
206
207
208static void ccid2_cwnd_application_limited(struct sock *sk, const u32 now)
209{
210 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
211
212 u32 init_win = rfc3390_bytes_to_packets(dccp_sk(sk)->dccps_mss_cache),
213 win_used = max(hc->tx_cwnd_used, init_win);
214
215 if (win_used < hc->tx_cwnd) {
216 hc->tx_ssthresh = max(hc->tx_ssthresh,
217 (hc->tx_cwnd >> 1) + (hc->tx_cwnd >> 2));
218 hc->tx_cwnd = (hc->tx_cwnd + win_used) >> 1;
219 }
220 hc->tx_cwnd_used = 0;
221 hc->tx_cwnd_stamp = now;
222
223 ccid2_check_l_ack_ratio(sk);
224}
225
226
227static void ccid2_cwnd_restart(struct sock *sk, const u32 now)
228{
229 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
230 u32 cwnd = hc->tx_cwnd, restart_cwnd,
231 iwnd = rfc3390_bytes_to_packets(dccp_sk(sk)->dccps_mss_cache);
232 s32 delta = now - hc->tx_lsndtime;
233
234 hc->tx_ssthresh = max(hc->tx_ssthresh, (cwnd >> 1) + (cwnd >> 2));
235
236
237 restart_cwnd = min(cwnd, iwnd);
238
239 while ((delta -= hc->tx_rto) >= 0 && cwnd > restart_cwnd)
240 cwnd >>= 1;
241 hc->tx_cwnd = max(cwnd, restart_cwnd);
242 hc->tx_cwnd_stamp = now;
243 hc->tx_cwnd_used = 0;
244
245 ccid2_check_l_ack_ratio(sk);
246}
247
248static void ccid2_hc_tx_packet_sent(struct sock *sk, unsigned int len)
249{
250 struct dccp_sock *dp = dccp_sk(sk);
251 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
252 const u32 now = ccid2_jiffies32;
253 struct ccid2_seq *next;
254
255
256 if (ccid2_do_cwv && !hc->tx_pipe &&
257 (s32)(now - hc->tx_lsndtime) >= hc->tx_rto)
258 ccid2_cwnd_restart(sk, now);
259
260 hc->tx_lsndtime = now;
261 hc->tx_pipe += 1;
262
263
264 if (ccid2_cwnd_network_limited(hc)) {
265 ccid2_update_used_window(hc, hc->tx_cwnd);
266 hc->tx_cwnd_used = 0;
267 hc->tx_cwnd_stamp = now;
268 } else {
269 if (hc->tx_pipe > hc->tx_cwnd_used)
270 hc->tx_cwnd_used = hc->tx_pipe;
271
272 ccid2_update_used_window(hc, hc->tx_cwnd_used);
273
274 if (ccid2_do_cwv && (s32)(now - hc->tx_cwnd_stamp) >= hc->tx_rto)
275 ccid2_cwnd_application_limited(sk, now);
276 }
277
278 hc->tx_seqh->ccid2s_seq = dp->dccps_gss;
279 hc->tx_seqh->ccid2s_acked = 0;
280 hc->tx_seqh->ccid2s_sent = now;
281
282 next = hc->tx_seqh->ccid2s_next;
283
284 if (next == hc->tx_seqt) {
285 if (ccid2_hc_tx_alloc_seq(hc)) {
286 DCCP_CRIT("packet history - out of memory!");
287
288 return;
289 }
290 next = hc->tx_seqh->ccid2s_next;
291 BUG_ON(next == hc->tx_seqt);
292 }
293 hc->tx_seqh = next;
294
295 ccid2_pr_debug("cwnd=%d pipe=%d\n", hc->tx_cwnd, hc->tx_pipe);
296
297
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311
312
313
314
315
316#if 0
317
318 hc->tx_arsent++;
319
320 if (hc->tx_ackloss) {
321 if (hc->tx_arsent >= hc->tx_cwnd) {
322 hc->tx_arsent = 0;
323 hc->tx_ackloss = 0;
324 }
325 } else {
326
327
328 if (dp->dccps_l_ack_ratio > 1) {
329
330 int denom = dp->dccps_l_ack_ratio * dp->dccps_l_ack_ratio -
331 dp->dccps_l_ack_ratio;
332
333 denom = hc->tx_cwnd * hc->tx_cwnd / denom;
334
335 if (hc->tx_arsent >= denom) {
336 ccid2_change_l_ack_ratio(sk, dp->dccps_l_ack_ratio - 1);
337 hc->tx_arsent = 0;
338 }
339 } else {
340
341 hc->tx_arsent = 0;
342 }
343 }
344#endif
345
346 sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + hc->tx_rto);
347
348#ifdef CONFIG_IP_DCCP_CCID2_DEBUG
349 do {
350 struct ccid2_seq *seqp = hc->tx_seqt;
351
352 while (seqp != hc->tx_seqh) {
353 ccid2_pr_debug("out seq=%llu acked=%d time=%u\n",
354 (unsigned long long)seqp->ccid2s_seq,
355 seqp->ccid2s_acked, seqp->ccid2s_sent);
356 seqp = seqp->ccid2s_next;
357 }
358 } while (0);
359 ccid2_pr_debug("=========\n");
360#endif
361}
362
363
364
365
366
367
368
369
370
371
372static void ccid2_rtt_estimator(struct sock *sk, const long mrtt)
373{
374 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
375 long m = mrtt ? : 1;
376
377 if (hc->tx_srtt == 0) {
378
379 hc->tx_srtt = m << 3;
380 hc->tx_mdev = m << 1;
381
382 hc->tx_mdev_max = max(hc->tx_mdev, tcp_rto_min(sk));
383 hc->tx_rttvar = hc->tx_mdev_max;
384
385 hc->tx_rtt_seq = dccp_sk(sk)->dccps_gss;
386 } else {
387
388 m -= (hc->tx_srtt >> 3);
389 hc->tx_srtt += m;
390
391
392 if (m < 0) {
393 m = -m;
394 m -= (hc->tx_mdev >> 2);
395
396
397
398
399
400 if (m > 0)
401 m >>= 3;
402 } else {
403 m -= (hc->tx_mdev >> 2);
404 }
405 hc->tx_mdev += m;
406
407 if (hc->tx_mdev > hc->tx_mdev_max) {
408 hc->tx_mdev_max = hc->tx_mdev;
409 if (hc->tx_mdev_max > hc->tx_rttvar)
410 hc->tx_rttvar = hc->tx_mdev_max;
411 }
412
413
414
415
416
417
418
419
420 if (after48(dccp_sk(sk)->dccps_gar, hc->tx_rtt_seq)) {
421 if (hc->tx_mdev_max < hc->tx_rttvar)
422 hc->tx_rttvar -= (hc->tx_rttvar -
423 hc->tx_mdev_max) >> 2;
424 hc->tx_rtt_seq = dccp_sk(sk)->dccps_gss;
425 hc->tx_mdev_max = tcp_rto_min(sk);
426 }
427 }
428
429
430
431
432
433
434
435
436 hc->tx_rto = (hc->tx_srtt >> 3) + hc->tx_rttvar;
437
438 if (hc->tx_rto > DCCP_RTO_MAX)
439 hc->tx_rto = DCCP_RTO_MAX;
440}
441
442static void ccid2_new_ack(struct sock *sk, struct ccid2_seq *seqp,
443 unsigned int *maxincr)
444{
445 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
446 struct dccp_sock *dp = dccp_sk(sk);
447 int r_seq_used = hc->tx_cwnd / dp->dccps_l_ack_ratio;
448
449 if (hc->tx_cwnd < dp->dccps_l_seq_win &&
450 r_seq_used < dp->dccps_r_seq_win) {
451 if (hc->tx_cwnd < hc->tx_ssthresh) {
452 if (*maxincr > 0 && ++hc->tx_packets_acked >= 2) {
453 hc->tx_cwnd += 1;
454 *maxincr -= 1;
455 hc->tx_packets_acked = 0;
456 }
457 } else if (++hc->tx_packets_acked >= hc->tx_cwnd) {
458 hc->tx_cwnd += 1;
459 hc->tx_packets_acked = 0;
460 }
461 }
462
463
464
465
466
467 if (r_seq_used * CCID2_WIN_CHANGE_FACTOR >= dp->dccps_r_seq_win)
468 ccid2_change_l_ack_ratio(sk, dp->dccps_l_ack_ratio * 2);
469 else if (r_seq_used * CCID2_WIN_CHANGE_FACTOR < dp->dccps_r_seq_win/2)
470 ccid2_change_l_ack_ratio(sk, dp->dccps_l_ack_ratio / 2 ? : 1U);
471
472 if (hc->tx_cwnd * CCID2_WIN_CHANGE_FACTOR >= dp->dccps_l_seq_win)
473 ccid2_change_l_seq_window(sk, dp->dccps_l_seq_win * 2);
474 else if (hc->tx_cwnd * CCID2_WIN_CHANGE_FACTOR < dp->dccps_l_seq_win/2)
475 ccid2_change_l_seq_window(sk, dp->dccps_l_seq_win / 2);
476
477
478
479
480
481
482
483
484
485 ccid2_rtt_estimator(sk, ccid2_jiffies32 - seqp->ccid2s_sent);
486}
487
488static void ccid2_congestion_event(struct sock *sk, struct ccid2_seq *seqp)
489{
490 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
491
492 if ((s32)(seqp->ccid2s_sent - hc->tx_last_cong) < 0) {
493 ccid2_pr_debug("Multiple losses in an RTT---treating as one\n");
494 return;
495 }
496
497 hc->tx_last_cong = ccid2_jiffies32;
498
499 hc->tx_cwnd = hc->tx_cwnd / 2 ? : 1U;
500 hc->tx_ssthresh = max(hc->tx_cwnd, 2U);
501
502 ccid2_check_l_ack_ratio(sk);
503}
504
505static int ccid2_hc_tx_parse_options(struct sock *sk, u8 packet_type,
506 u8 option, u8 *optval, u8 optlen)
507{
508 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
509
510 switch (option) {
511 case DCCPO_ACK_VECTOR_0:
512 case DCCPO_ACK_VECTOR_1:
513 return dccp_ackvec_parsed_add(&hc->tx_av_chunks, optval, optlen,
514 option - DCCPO_ACK_VECTOR_0);
515 }
516 return 0;
517}
518
519static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
520{
521 struct dccp_sock *dp = dccp_sk(sk);
522 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
523 const bool sender_was_blocked = ccid2_cwnd_network_limited(hc);
524 struct dccp_ackvec_parsed *avp;
525 u64 ackno, seqno;
526 struct ccid2_seq *seqp;
527 int done = 0;
528 unsigned int maxincr = 0;
529
530
531 seqno = DCCP_SKB_CB(skb)->dccpd_seq;
532
533
534
535
536
537
538 if (hc->tx_rpdupack == -1) {
539 hc->tx_rpdupack = 0;
540 hc->tx_rpseq = seqno;
541 } else {
542
543 if (dccp_delta_seqno(hc->tx_rpseq, seqno) == 1)
544 hc->tx_rpseq = seqno;
545
546 else if (after48(seqno, hc->tx_rpseq)) {
547 hc->tx_rpdupack++;
548
549
550 if (hc->tx_rpdupack >= NUMDUPACK) {
551 hc->tx_rpdupack = -1;
552 hc->tx_rpseq = 0;
553#ifdef __CCID2_COPES_GRACEFULLY_WITH_ACK_CONGESTION_CONTROL__
554
555
556
557
558
559
560
561 ccid2_change_l_ack_ratio(sk, 2 * dp->dccps_l_ack_ratio);
562#endif
563 }
564 }
565 }
566
567
568 if (dccp_packet_without_ack(skb))
569 return;
570
571
572 if (hc->tx_seqh == hc->tx_seqt)
573 goto done;
574
575 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq;
576 if (after48(ackno, hc->tx_high_ack))
577 hc->tx_high_ack = ackno;
578
579 seqp = hc->tx_seqt;
580 while (before48(seqp->ccid2s_seq, ackno)) {
581 seqp = seqp->ccid2s_next;
582 if (seqp == hc->tx_seqh) {
583 seqp = hc->tx_seqh->ccid2s_prev;
584 break;
585 }
586 }
587
588
589
590
591
592
593 if (hc->tx_cwnd < hc->tx_ssthresh)
594 maxincr = DIV_ROUND_UP(dp->dccps_l_ack_ratio, 2);
595
596
597 list_for_each_entry(avp, &hc->tx_av_chunks, node) {
598
599 for (; avp->len--; avp->vec++) {
600 u64 ackno_end_rl = SUB48(ackno,
601 dccp_ackvec_runlen(avp->vec));
602
603 ccid2_pr_debug("ackvec %llu |%u,%u|\n",
604 (unsigned long long)ackno,
605 dccp_ackvec_state(avp->vec) >> 6,
606 dccp_ackvec_runlen(avp->vec));
607
608
609
610
611 while (after48(seqp->ccid2s_seq, ackno)) {
612 if (seqp == hc->tx_seqt) {
613 done = 1;
614 break;
615 }
616 seqp = seqp->ccid2s_prev;
617 }
618 if (done)
619 break;
620
621
622
623
624 while (between48(seqp->ccid2s_seq,ackno_end_rl,ackno)) {
625 const u8 state = dccp_ackvec_state(avp->vec);
626
627
628 if (state != DCCPAV_NOT_RECEIVED &&
629 !seqp->ccid2s_acked) {
630 if (state == DCCPAV_ECN_MARKED)
631 ccid2_congestion_event(sk,
632 seqp);
633 else
634 ccid2_new_ack(sk, seqp,
635 &maxincr);
636
637 seqp->ccid2s_acked = 1;
638 ccid2_pr_debug("Got ack for %llu\n",
639 (unsigned long long)seqp->ccid2s_seq);
640 hc->tx_pipe--;
641 }
642 if (seqp == hc->tx_seqt) {
643 done = 1;
644 break;
645 }
646 seqp = seqp->ccid2s_prev;
647 }
648 if (done)
649 break;
650
651 ackno = SUB48(ackno_end_rl, 1);
652 }
653 if (done)
654 break;
655 }
656
657
658
659
660 seqp = hc->tx_seqt;
661 while (before48(seqp->ccid2s_seq, hc->tx_high_ack)) {
662 seqp = seqp->ccid2s_next;
663 if (seqp == hc->tx_seqh) {
664 seqp = hc->tx_seqh->ccid2s_prev;
665 break;
666 }
667 }
668 done = 0;
669 while (1) {
670 if (seqp->ccid2s_acked) {
671 done++;
672 if (done == NUMDUPACK)
673 break;
674 }
675 if (seqp == hc->tx_seqt)
676 break;
677 seqp = seqp->ccid2s_prev;
678 }
679
680
681
682
683 if (done == NUMDUPACK) {
684 struct ccid2_seq *last_acked = seqp;
685
686
687 while (1) {
688 if (!seqp->ccid2s_acked) {
689 ccid2_pr_debug("Packet lost: %llu\n",
690 (unsigned long long)seqp->ccid2s_seq);
691
692
693
694
695 ccid2_congestion_event(sk, seqp);
696 hc->tx_pipe--;
697 }
698 if (seqp == hc->tx_seqt)
699 break;
700 seqp = seqp->ccid2s_prev;
701 }
702
703 hc->tx_seqt = last_acked;
704 }
705
706
707 while (hc->tx_seqt != hc->tx_seqh) {
708 if (!hc->tx_seqt->ccid2s_acked)
709 break;
710
711 hc->tx_seqt = hc->tx_seqt->ccid2s_next;
712 }
713
714
715 if (hc->tx_pipe == 0)
716 sk_stop_timer(sk, &hc->tx_rtotimer);
717 else
718 sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + hc->tx_rto);
719done:
720
721 if (sender_was_blocked && !ccid2_cwnd_network_limited(hc))
722 dccp_tasklet_schedule(sk);
723 dccp_ackvec_parsed_cleanup(&hc->tx_av_chunks);
724}
725
726static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
727{
728 struct ccid2_hc_tx_sock *hc = ccid_priv(ccid);
729 struct dccp_sock *dp = dccp_sk(sk);
730 u32 max_ratio;
731
732
733 hc->tx_ssthresh = ~0U;
734
735
736 hc->tx_cwnd = rfc3390_bytes_to_packets(dp->dccps_mss_cache);
737 hc->tx_expected_wnd = hc->tx_cwnd;
738
739
740 max_ratio = DIV_ROUND_UP(hc->tx_cwnd, 2);
741 if (dp->dccps_l_ack_ratio == 0 || dp->dccps_l_ack_ratio > max_ratio)
742 dp->dccps_l_ack_ratio = max_ratio;
743
744
745 if (ccid2_hc_tx_alloc_seq(hc))
746 return -ENOMEM;
747
748 hc->tx_rto = DCCP_TIMEOUT_INIT;
749 hc->tx_rpdupack = -1;
750 hc->tx_last_cong = hc->tx_lsndtime = hc->tx_cwnd_stamp = ccid2_jiffies32;
751 hc->tx_cwnd_used = 0;
752 hc->sk = sk;
753 timer_setup(&hc->tx_rtotimer, ccid2_hc_tx_rto_expire, 0);
754 INIT_LIST_HEAD(&hc->tx_av_chunks);
755 return 0;
756}
757
758static void ccid2_hc_tx_exit(struct sock *sk)
759{
760 struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
761 int i;
762
763 sk_stop_timer(sk, &hc->tx_rtotimer);
764
765 for (i = 0; i < hc->tx_seqbufc; i++)
766 kfree(hc->tx_seqbuf[i]);
767 hc->tx_seqbufc = 0;
768 dccp_ackvec_parsed_cleanup(&hc->tx_av_chunks);
769}
770
771static void ccid2_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
772{
773 struct ccid2_hc_rx_sock *hc = ccid2_hc_rx_sk(sk);
774
775 if (!dccp_data_packet(skb))
776 return;
777
778 if (++hc->rx_num_data_pkts >= dccp_sk(sk)->dccps_r_ack_ratio) {
779 dccp_send_ack(sk);
780 hc->rx_num_data_pkts = 0;
781 }
782}
783
784struct ccid_operations ccid2_ops = {
785 .ccid_id = DCCPC_CCID2,
786 .ccid_name = "TCP-like",
787 .ccid_hc_tx_obj_size = sizeof(struct ccid2_hc_tx_sock),
788 .ccid_hc_tx_init = ccid2_hc_tx_init,
789 .ccid_hc_tx_exit = ccid2_hc_tx_exit,
790 .ccid_hc_tx_send_packet = ccid2_hc_tx_send_packet,
791 .ccid_hc_tx_packet_sent = ccid2_hc_tx_packet_sent,
792 .ccid_hc_tx_parse_options = ccid2_hc_tx_parse_options,
793 .ccid_hc_tx_packet_recv = ccid2_hc_tx_packet_recv,
794 .ccid_hc_rx_obj_size = sizeof(struct ccid2_hc_rx_sock),
795 .ccid_hc_rx_packet_recv = ccid2_hc_rx_packet_recv,
796};
797
798#ifdef CONFIG_IP_DCCP_CCID2_DEBUG
799module_param(ccid2_debug, bool, 0644);
800MODULE_PARM_DESC(ccid2_debug, "Enable CCID-2 debug messages");
801#endif
802