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Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[GitHub/LineageOS/android_kernel_samsung_universal7580.git] / net / dccp / ccids / ccid3.c
1 /*
2 * net/dccp/ccids/ccid3.c
3 *
4 * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
5 * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
6 *
7 * An implementation of the DCCP protocol
8 *
9 * This code has been developed by the University of Waikato WAND
10 * research group. For further information please see http://www.wand.net.nz/
11 *
12 * This code also uses code from Lulea University, rereleased as GPL by its
13 * authors:
14 * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
15 *
16 * Changes to meet Linux coding standards, to make it meet latest ccid3 draft
17 * and to make it work as a loadable module in the DCCP stack written by
18 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>.
19 *
20 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
21 *
22 * This program is free software; you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License as published by
24 * the Free Software Foundation; either version 2 of the License, or
25 * (at your option) any later version.
26 *
27 * This program is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
31 *
32 * You should have received a copy of the GNU General Public License
33 * along with this program; if not, write to the Free Software
34 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 */
36
37 #include "../ccid.h"
38 #include "../dccp.h"
39 #include "lib/packet_history.h"
40 #include "lib/loss_interval.h"
41 #include "lib/tfrc.h"
42 #include "ccid3.h"
43
44 /*
45 * Reason for maths here is to avoid 32 bit overflow when a is big.
46 * With this we get close to the limit.
47 */
48 static u32 usecs_div(const u32 a, const u32 b)
49 {
50 const u32 div = a < (UINT_MAX / (USEC_PER_SEC / 10)) ? 10 :
51 a < (UINT_MAX / (USEC_PER_SEC / 50)) ? 50 :
52 a < (UINT_MAX / (USEC_PER_SEC / 100)) ? 100 :
53 a < (UINT_MAX / (USEC_PER_SEC / 500)) ? 500 :
54 a < (UINT_MAX / (USEC_PER_SEC / 1000)) ? 1000 :
55 a < (UINT_MAX / (USEC_PER_SEC / 5000)) ? 5000 :
56 a < (UINT_MAX / (USEC_PER_SEC / 10000)) ? 10000 :
57 a < (UINT_MAX / (USEC_PER_SEC / 50000)) ? 50000 :
58 100000;
59 const u32 tmp = a * (USEC_PER_SEC / div);
60 return (b >= 2 * div) ? tmp / (b / div) : tmp;
61 }
62
63 static int ccid3_debug;
64
65 #ifdef CCID3_DEBUG
66 #define ccid3_pr_debug(format, a...) \
67 do { if (ccid3_debug) \
68 printk(KERN_DEBUG "%s: " format, __FUNCTION__, ##a); \
69 } while (0)
70 #else
71 #define ccid3_pr_debug(format, a...)
72 #endif
73
74 static struct dccp_tx_hist *ccid3_tx_hist;
75 static struct dccp_rx_hist *ccid3_rx_hist;
76 static struct dccp_li_hist *ccid3_li_hist;
77
78 /* TFRC sender states */
79 enum ccid3_hc_tx_states {
80 TFRC_SSTATE_NO_SENT = 1,
81 TFRC_SSTATE_NO_FBACK,
82 TFRC_SSTATE_FBACK,
83 TFRC_SSTATE_TERM,
84 };
85
86 #ifdef CCID3_DEBUG
87 static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state)
88 {
89 static char *ccid3_state_names[] = {
90 [TFRC_SSTATE_NO_SENT] = "NO_SENT",
91 [TFRC_SSTATE_NO_FBACK] = "NO_FBACK",
92 [TFRC_SSTATE_FBACK] = "FBACK",
93 [TFRC_SSTATE_TERM] = "TERM",
94 };
95
96 return ccid3_state_names[state];
97 }
98 #endif
99
100 static void ccid3_hc_tx_set_state(struct sock *sk,
101 enum ccid3_hc_tx_states state)
102 {
103 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
104 enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state;
105
106 ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
107 dccp_role(sk), sk, ccid3_tx_state_name(oldstate),
108 ccid3_tx_state_name(state));
109 WARN_ON(state == oldstate);
110 hctx->ccid3hctx_state = state;
111 }
112
113 /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */
114 static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock *hctx)
115 {
116 /*
117 * If no feedback spec says t_ipi is 1 second (set elsewhere and then
118 * doubles after every no feedback timer (separate function)
119 */
120 if (hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK)
121 hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s,
122 hctx->ccid3hctx_x);
123 }
124
125 /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */
126 static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx)
127 {
128 hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2,
129 TFRC_OPSYS_HALF_TIME_GRAN);
130 }
131
132 /*
133 * Update X by
134 * If (p > 0)
135 * x_calc = calcX(s, R, p);
136 * X = max(min(X_calc, 2 * X_recv), s / t_mbi);
137 * Else
138 * If (now - tld >= R)
139 * X = max(min(2 * X, 2 * X_recv), s / R);
140 * tld = now;
141 */
142 static void ccid3_hc_tx_update_x(struct sock *sk)
143 {
144 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
145
146 /* To avoid large error in calcX */
147 if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) {
148 hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s,
149 hctx->ccid3hctx_rtt,
150 hctx->ccid3hctx_p);
151 hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc,
152 2 * hctx->ccid3hctx_x_recv),
153 (hctx->ccid3hctx_s /
154 TFRC_MAX_BACK_OFF_TIME));
155 } else {
156 struct timeval now;
157
158 dccp_timestamp(sk, &now);
159 if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >=
160 hctx->ccid3hctx_rtt) {
161 hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv,
162 hctx->ccid3hctx_x) * 2,
163 usecs_div(hctx->ccid3hctx_s,
164 hctx->ccid3hctx_rtt));
165 hctx->ccid3hctx_t_ld = now;
166 }
167 }
168 }
169
170 static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
171 {
172 struct sock *sk = (struct sock *)data;
173 unsigned long next_tmout = 0;
174 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
175
176 bh_lock_sock(sk);
177 if (sock_owned_by_user(sk)) {
178 /* Try again later. */
179 /* XXX: set some sensible MIB */
180 sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
181 jiffies + HZ / 5);
182 goto out;
183 }
184
185 ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk,
186 ccid3_tx_state_name(hctx->ccid3hctx_state));
187
188 switch (hctx->ccid3hctx_state) {
189 case TFRC_SSTATE_TERM:
190 goto out;
191 case TFRC_SSTATE_NO_FBACK:
192 /* Halve send rate */
193 hctx->ccid3hctx_x /= 2;
194 if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s /
195 TFRC_MAX_BACK_OFF_TIME))
196 hctx->ccid3hctx_x = (hctx->ccid3hctx_s /
197 TFRC_MAX_BACK_OFF_TIME);
198
199 ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d "
200 "bytes/s\n",
201 dccp_role(sk), sk,
202 ccid3_tx_state_name(hctx->ccid3hctx_state),
203 hctx->ccid3hctx_x);
204 next_tmout = max_t(u32, 2 * usecs_div(hctx->ccid3hctx_s,
205 hctx->ccid3hctx_x),
206 TFRC_INITIAL_TIMEOUT);
207 /*
208 * FIXME - not sure above calculation is correct. See section
209 * 5 of CCID3 11 should adjust tx_t_ipi and double that to
210 * achieve it really
211 */
212 break;
213 case TFRC_SSTATE_FBACK:
214 /*
215 * Check if IDLE since last timeout and recv rate is less than
216 * 4 packets per RTT
217 */
218 if (!hctx->ccid3hctx_idle ||
219 (hctx->ccid3hctx_x_recv >=
220 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) {
221 ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n",
222 dccp_role(sk), sk,
223 ccid3_tx_state_name(hctx->ccid3hctx_state));
224 /* Halve sending rate */
225
226 /* If (X_calc > 2 * X_recv)
227 * X_recv = max(X_recv / 2, s / (2 * t_mbi));
228 * Else
229 * X_recv = X_calc / 4;
230 */
231 BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P &&
232 hctx->ccid3hctx_x_calc == 0);
233
234 /* check also if p is zero -> x_calc is infinity? */
235 if (hctx->ccid3hctx_p < TFRC_SMALLEST_P ||
236 hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv)
237 hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2,
238 hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME));
239 else
240 hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4;
241
242 /* Update sending rate */
243 ccid3_hc_tx_update_x(sk);
244 }
245 /*
246 * Schedule no feedback timer to expire in
247 * max(4 * R, 2 * s / X)
248 */
249 next_tmout = max_t(u32, hctx->ccid3hctx_t_rto,
250 2 * usecs_div(hctx->ccid3hctx_s,
251 hctx->ccid3hctx_x));
252 break;
253 default:
254 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
255 __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
256 dump_stack();
257 goto out;
258 }
259
260 sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
261 jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout)));
262 hctx->ccid3hctx_idle = 1;
263 out:
264 bh_unlock_sock(sk);
265 sock_put(sk);
266 }
267
268 static int ccid3_hc_tx_send_packet(struct sock *sk,
269 struct sk_buff *skb, int len)
270 {
271 struct dccp_sock *dp = dccp_sk(sk);
272 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
273 struct dccp_tx_hist_entry *new_packet;
274 struct timeval now;
275 long delay;
276 int rc = -ENOTCONN;
277
278 BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM);
279
280 /* Check if pure ACK or Terminating*/
281 /*
282 * XXX: We only call this function for DATA and DATAACK, on, these
283 * packets can have zero length, but why the comment about "pure ACK"?
284 */
285 if (unlikely(len == 0))
286 goto out;
287
288 /* See if last packet allocated was not sent */
289 new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
290 if (new_packet == NULL || new_packet->dccphtx_sent) {
291 new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist,
292 SLAB_ATOMIC);
293
294 rc = -ENOBUFS;
295 if (unlikely(new_packet == NULL)) {
296 LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, not enough "
297 "mem to add to history, send refused\n",
298 __FUNCTION__, dccp_role(sk), sk);
299 goto out;
300 }
301
302 dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet);
303 }
304
305 dccp_timestamp(sk, &now);
306
307 switch (hctx->ccid3hctx_state) {
308 case TFRC_SSTATE_NO_SENT:
309 sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
310 jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT));
311 hctx->ccid3hctx_last_win_count = 0;
312 hctx->ccid3hctx_t_last_win_count = now;
313 ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK);
314 hctx->ccid3hctx_t_ipi = TFRC_INITIAL_IPI;
315
316 /* Set nominal send time for initial packet */
317 hctx->ccid3hctx_t_nom = now;
318 timeval_add_usecs(&hctx->ccid3hctx_t_nom,
319 hctx->ccid3hctx_t_ipi);
320 ccid3_calc_new_delta(hctx);
321 rc = 0;
322 break;
323 case TFRC_SSTATE_NO_FBACK:
324 case TFRC_SSTATE_FBACK:
325 delay = (timeval_delta(&now, &hctx->ccid3hctx_t_nom) -
326 hctx->ccid3hctx_delta);
327 delay /= -1000;
328 /* divide by -1000 is to convert to ms and get sign right */
329 rc = delay > 0 ? delay : 0;
330 break;
331 default:
332 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
333 __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
334 dump_stack();
335 rc = -EINVAL;
336 break;
337 }
338
339 /* Can we send? if so add options and add to packet history */
340 if (rc == 0) {
341 dp->dccps_hc_tx_insert_options = 1;
342 new_packet->dccphtx_ccval =
343 DCCP_SKB_CB(skb)->dccpd_ccval =
344 hctx->ccid3hctx_last_win_count;
345 }
346 out:
347 return rc;
348 }
349
350 static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
351 {
352 const struct dccp_sock *dp = dccp_sk(sk);
353 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
354 struct timeval now;
355
356 BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM);
357
358 dccp_timestamp(sk, &now);
359
360 /* check if we have sent a data packet */
361 if (len > 0) {
362 unsigned long quarter_rtt;
363 struct dccp_tx_hist_entry *packet;
364
365 packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
366 if (unlikely(packet == NULL)) {
367 LIMIT_NETDEBUG(KERN_WARNING "%s: packet doesn't "
368 "exists in history!\n", __FUNCTION__);
369 return;
370 }
371 if (unlikely(packet->dccphtx_sent)) {
372 LIMIT_NETDEBUG(KERN_WARNING "%s: no unsent packet in "
373 "history!\n", __FUNCTION__);
374 return;
375 }
376 packet->dccphtx_tstamp = now;
377 packet->dccphtx_seqno = dp->dccps_gss;
378 /*
379 * Check if win_count have changed
380 * Algorithm in "8.1. Window Counter Valuer" in
381 * draft-ietf-dccp-ccid3-11.txt
382 */
383 quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count);
384 if (likely(hctx->ccid3hctx_rtt > 8))
385 quarter_rtt /= hctx->ccid3hctx_rtt / 4;
386
387 if (quarter_rtt > 0) {
388 hctx->ccid3hctx_t_last_win_count = now;
389 hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count +
390 min_t(unsigned long, quarter_rtt, 5)) % 16;
391 ccid3_pr_debug("%s, sk=%p, window changed from "
392 "%u to %u!\n",
393 dccp_role(sk), sk,
394 packet->dccphtx_ccval,
395 hctx->ccid3hctx_last_win_count);
396 }
397
398 hctx->ccid3hctx_idle = 0;
399 packet->dccphtx_rtt = hctx->ccid3hctx_rtt;
400 packet->dccphtx_sent = 1;
401 } else
402 ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n",
403 dccp_role(sk), sk, dp->dccps_gss);
404
405 switch (hctx->ccid3hctx_state) {
406 case TFRC_SSTATE_NO_SENT:
407 /* if first wasn't pure ack */
408 if (len != 0)
409 printk(KERN_CRIT "%s: %s, First packet sent is noted "
410 "as a data packet\n",
411 __FUNCTION__, dccp_role(sk));
412 return;
413 case TFRC_SSTATE_NO_FBACK:
414 case TFRC_SSTATE_FBACK:
415 if (len > 0) {
416 hctx->ccid3hctx_t_nom = now;
417 ccid3_calc_new_t_ipi(hctx);
418 ccid3_calc_new_delta(hctx);
419 timeval_add_usecs(&hctx->ccid3hctx_t_nom,
420 hctx->ccid3hctx_t_ipi);
421 }
422 break;
423 default:
424 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
425 __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
426 dump_stack();
427 break;
428 }
429 }
430
431 static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
432 {
433 const struct dccp_sock *dp = dccp_sk(sk);
434 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
435 struct ccid3_options_received *opt_recv;
436 struct dccp_tx_hist_entry *packet;
437 struct timeval now;
438 unsigned long next_tmout;
439 u32 t_elapsed;
440 u32 pinv;
441 u32 x_recv;
442 u32 r_sample;
443
444 BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM);
445
446 /* we are only interested in ACKs */
447 if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK ||
448 DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK))
449 return;
450
451 opt_recv = &hctx->ccid3hctx_options_received;
452
453 t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10;
454 x_recv = opt_recv->ccid3or_receive_rate;
455 pinv = opt_recv->ccid3or_loss_event_rate;
456
457 switch (hctx->ccid3hctx_state) {
458 case TFRC_SSTATE_NO_SENT:
459 /* FIXME: what to do here? */
460 return;
461 case TFRC_SSTATE_NO_FBACK:
462 case TFRC_SSTATE_FBACK:
463 /* Calculate new round trip sample by
464 * R_sample = (now - t_recvdata) - t_delay */
465 /* get t_recvdata from history */
466 packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist,
467 DCCP_SKB_CB(skb)->dccpd_ack_seq);
468 if (unlikely(packet == NULL)) {
469 LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, seqno "
470 "%llu(%s) does't exist in history!\n",
471 __FUNCTION__, dccp_role(sk), sk,
472 (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq,
473 dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
474 return;
475 }
476
477 /* Update RTT */
478 dccp_timestamp(sk, &now);
479 r_sample = timeval_delta(&now, &packet->dccphtx_tstamp);
480 if (unlikely(r_sample <= t_elapsed))
481 LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, "
482 "t_elapsed=%uus\n",
483 __FUNCTION__, r_sample, t_elapsed);
484 else
485 r_sample -= t_elapsed;
486
487 /* Update RTT estimate by
488 * If (No feedback recv)
489 * R = R_sample;
490 * Else
491 * R = q * R + (1 - q) * R_sample;
492 *
493 * q is a constant, RFC 3448 recomments 0.9
494 */
495 if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) {
496 ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK);
497 hctx->ccid3hctx_rtt = r_sample;
498 } else
499 hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 +
500 r_sample / 10;
501
502 ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, "
503 "r_sample=%us\n", dccp_role(sk), sk,
504 hctx->ccid3hctx_rtt, r_sample);
505
506 /* Update timeout interval */
507 hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt,
508 USEC_PER_SEC);
509
510 /* Update receive rate */
511 hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */
512
513 /* Update loss event rate */
514 if (pinv == ~0 || pinv == 0)
515 hctx->ccid3hctx_p = 0;
516 else {
517 hctx->ccid3hctx_p = 1000000 / pinv;
518
519 if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) {
520 hctx->ccid3hctx_p = TFRC_SMALLEST_P;
521 ccid3_pr_debug("%s, sk=%p, Smallest p used!\n",
522 dccp_role(sk), sk);
523 }
524 }
525
526 /* unschedule no feedback timer */
527 sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
528
529 /* Update sending rate */
530 ccid3_hc_tx_update_x(sk);
531
532 /* Update next send time */
533 timeval_sub_usecs(&hctx->ccid3hctx_t_nom,
534 hctx->ccid3hctx_t_ipi);
535 ccid3_calc_new_t_ipi(hctx);
536 timeval_add_usecs(&hctx->ccid3hctx_t_nom,
537 hctx->ccid3hctx_t_ipi);
538 ccid3_calc_new_delta(hctx);
539
540 /* remove all packets older than the one acked from history */
541 dccp_tx_hist_purge_older(ccid3_tx_hist,
542 &hctx->ccid3hctx_hist, packet);
543 /*
544 * As we have calculated new ipi, delta, t_nom it is possible that
545 * we now can send a packet, so wake up dccp_wait_for_ccids.
546 */
547 sk->sk_write_space(sk);
548
549 /*
550 * Schedule no feedback timer to expire in
551 * max(4 * R, 2 * s / X)
552 */
553 next_tmout = max(hctx->ccid3hctx_t_rto,
554 2 * usecs_div(hctx->ccid3hctx_s,
555 hctx->ccid3hctx_x));
556
557 ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to "
558 "expire in %lu jiffies (%luus)\n",
559 dccp_role(sk), sk,
560 usecs_to_jiffies(next_tmout), next_tmout);
561
562 sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
563 jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout)));
564
565 /* set idle flag */
566 hctx->ccid3hctx_idle = 1;
567 break;
568 default:
569 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
570 __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
571 dump_stack();
572 break;
573 }
574 }
575
576 static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb)
577 {
578 const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
579
580 BUG_ON(hctx == NULL);
581
582 if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)
583 DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count;
584 return 0;
585 }
586
587 static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
588 unsigned char len, u16 idx,
589 unsigned char *value)
590 {
591 int rc = 0;
592 const struct dccp_sock *dp = dccp_sk(sk);
593 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
594 struct ccid3_options_received *opt_recv;
595
596 BUG_ON(hctx == NULL);
597
598 opt_recv = &hctx->ccid3hctx_options_received;
599
600 if (opt_recv->ccid3or_seqno != dp->dccps_gsr) {
601 opt_recv->ccid3or_seqno = dp->dccps_gsr;
602 opt_recv->ccid3or_loss_event_rate = ~0;
603 opt_recv->ccid3or_loss_intervals_idx = 0;
604 opt_recv->ccid3or_loss_intervals_len = 0;
605 opt_recv->ccid3or_receive_rate = 0;
606 }
607
608 switch (option) {
609 case TFRC_OPT_LOSS_EVENT_RATE:
610 if (unlikely(len != 4)) {
611 LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid "
612 "len for TFRC_OPT_LOSS_EVENT_RATE\n",
613 __FUNCTION__, dccp_role(sk), sk);
614 rc = -EINVAL;
615 } else {
616 opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value);
617 ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n",
618 dccp_role(sk), sk,
619 opt_recv->ccid3or_loss_event_rate);
620 }
621 break;
622 case TFRC_OPT_LOSS_INTERVALS:
623 opt_recv->ccid3or_loss_intervals_idx = idx;
624 opt_recv->ccid3or_loss_intervals_len = len;
625 ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n",
626 dccp_role(sk), sk,
627 opt_recv->ccid3or_loss_intervals_idx,
628 opt_recv->ccid3or_loss_intervals_len);
629 break;
630 case TFRC_OPT_RECEIVE_RATE:
631 if (unlikely(len != 4)) {
632 LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid "
633 "len for TFRC_OPT_RECEIVE_RATE\n",
634 __FUNCTION__, dccp_role(sk), sk);
635 rc = -EINVAL;
636 } else {
637 opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value);
638 ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n",
639 dccp_role(sk), sk,
640 opt_recv->ccid3or_receive_rate);
641 }
642 break;
643 }
644
645 return rc;
646 }
647
648 static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk)
649 {
650 struct dccp_sock *dp = dccp_sk(sk);
651 struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid);
652
653 if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE &&
654 dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE)
655 hctx->ccid3hctx_s = dp->dccps_packet_size;
656 else
657 hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE;
658
659 /* Set transmission rate to 1 packet per second */
660 hctx->ccid3hctx_x = hctx->ccid3hctx_s;
661 hctx->ccid3hctx_t_rto = USEC_PER_SEC;
662 hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT;
663 INIT_LIST_HEAD(&hctx->ccid3hctx_hist);
664
665 hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer;
666 hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk;
667 init_timer(&hctx->ccid3hctx_no_feedback_timer);
668
669 return 0;
670 }
671
672 static void ccid3_hc_tx_exit(struct sock *sk)
673 {
674 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
675
676 BUG_ON(hctx == NULL);
677
678 ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM);
679 sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
680
681 /* Empty packet history */
682 dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist);
683 }
684
685 /*
686 * RX Half Connection methods
687 */
688
689 /* TFRC receiver states */
690 enum ccid3_hc_rx_states {
691 TFRC_RSTATE_NO_DATA = 1,
692 TFRC_RSTATE_DATA,
693 TFRC_RSTATE_TERM = 127,
694 };
695
696 #ifdef CCID3_DEBUG
697 static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state)
698 {
699 static char *ccid3_rx_state_names[] = {
700 [TFRC_RSTATE_NO_DATA] = "NO_DATA",
701 [TFRC_RSTATE_DATA] = "DATA",
702 [TFRC_RSTATE_TERM] = "TERM",
703 };
704
705 return ccid3_rx_state_names[state];
706 }
707 #endif
708
709 static void ccid3_hc_rx_set_state(struct sock *sk,
710 enum ccid3_hc_rx_states state)
711 {
712 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
713 enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state;
714
715 ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
716 dccp_role(sk), sk, ccid3_rx_state_name(oldstate),
717 ccid3_rx_state_name(state));
718 WARN_ON(state == oldstate);
719 hcrx->ccid3hcrx_state = state;
720 }
721
722 static void ccid3_hc_rx_send_feedback(struct sock *sk)
723 {
724 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
725 struct dccp_sock *dp = dccp_sk(sk);
726 struct dccp_rx_hist_entry *packet;
727 struct timeval now;
728
729 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
730
731 dccp_timestamp(sk, &now);
732
733 switch (hcrx->ccid3hcrx_state) {
734 case TFRC_RSTATE_NO_DATA:
735 hcrx->ccid3hcrx_x_recv = 0;
736 break;
737 case TFRC_RSTATE_DATA: {
738 const u32 delta = timeval_delta(&now,
739 &hcrx->ccid3hcrx_tstamp_last_feedback);
740 hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv,
741 delta);
742 }
743 break;
744 default:
745 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
746 __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state);
747 dump_stack();
748 return;
749 }
750
751 packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist);
752 if (unlikely(packet == NULL)) {
753 LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, no data packet "
754 "in history!\n",
755 __FUNCTION__, dccp_role(sk), sk);
756 return;
757 }
758
759 hcrx->ccid3hcrx_tstamp_last_feedback = now;
760 hcrx->ccid3hcrx_last_counter = packet->dccphrx_ccval;
761 hcrx->ccid3hcrx_seqno_last_counter = packet->dccphrx_seqno;
762 hcrx->ccid3hcrx_bytes_recv = 0;
763
764 /* Convert to multiples of 10us */
765 hcrx->ccid3hcrx_elapsed_time =
766 timeval_delta(&now, &packet->dccphrx_tstamp) / 10;
767 if (hcrx->ccid3hcrx_p == 0)
768 hcrx->ccid3hcrx_pinv = ~0;
769 else
770 hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p;
771 dp->dccps_hc_rx_insert_options = 1;
772 dccp_send_ack(sk);
773 }
774
775 static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
776 {
777 const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
778 __be32 x_recv, pinv;
779
780 BUG_ON(hcrx == NULL);
781
782 if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN))
783 return 0;
784
785 DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_last_counter;
786
787 if (dccp_packet_without_ack(skb))
788 return 0;
789
790 x_recv = htonl(hcrx->ccid3hcrx_x_recv);
791 pinv = htonl(hcrx->ccid3hcrx_pinv);
792
793 if ((hcrx->ccid3hcrx_elapsed_time != 0 &&
794 dccp_insert_option_elapsed_time(sk, skb,
795 hcrx->ccid3hcrx_elapsed_time)) ||
796 dccp_insert_option_timestamp(sk, skb) ||
797 dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE,
798 &pinv, sizeof(pinv)) ||
799 dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE,
800 &x_recv, sizeof(x_recv)))
801 return -1;
802
803 return 0;
804 }
805
806 /* calculate first loss interval
807 *
808 * returns estimated loss interval in usecs */
809
810 static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
811 {
812 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
813 struct dccp_rx_hist_entry *entry, *next, *tail = NULL;
814 u32 rtt, delta, x_recv, fval, p, tmp2;
815 struct timeval tstamp = { 0, };
816 int interval = 0;
817 int win_count = 0;
818 int step = 0;
819 u64 tmp1;
820
821 list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist,
822 dccphrx_node) {
823 if (dccp_rx_hist_entry_data_packet(entry)) {
824 tail = entry;
825
826 switch (step) {
827 case 0:
828 tstamp = entry->dccphrx_tstamp;
829 win_count = entry->dccphrx_ccval;
830 step = 1;
831 break;
832 case 1:
833 interval = win_count - entry->dccphrx_ccval;
834 if (interval < 0)
835 interval += TFRC_WIN_COUNT_LIMIT;
836 if (interval > 4)
837 goto found;
838 break;
839 }
840 }
841 }
842
843 if (unlikely(step == 0)) {
844 LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, packet history "
845 "contains no data packets!\n",
846 __FUNCTION__, dccp_role(sk), sk);
847 return ~0;
848 }
849
850 if (unlikely(interval == 0)) {
851 LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Could not find a "
852 "win_count interval > 0. Defaulting to 1\n",
853 __FUNCTION__, dccp_role(sk), sk);
854 interval = 1;
855 }
856 found:
857 rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval;
858 ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n",
859 dccp_role(sk), sk, rtt);
860 if (rtt == 0)
861 rtt = 1;
862
863 dccp_timestamp(sk, &tstamp);
864 delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback);
865 x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta);
866
867 tmp1 = (u64)x_recv * (u64)rtt;
868 do_div(tmp1,10000000);
869 tmp2 = (u32)tmp1;
870 fval = (hcrx->ccid3hcrx_s * 100000) / tmp2;
871 /* do not alter order above or you will get overflow on 32 bit */
872 p = tfrc_calc_x_reverse_lookup(fval);
873 ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied "
874 "loss rate=%u\n", dccp_role(sk), sk, x_recv, p);
875
876 if (p == 0)
877 return ~0;
878 else
879 return 1000000 / p;
880 }
881
882 static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss)
883 {
884 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
885
886 if (seq_loss != DCCP_MAX_SEQNO + 1 &&
887 list_empty(&hcrx->ccid3hcrx_li_hist)) {
888 struct dccp_li_hist_entry *li_tail;
889
890 li_tail = dccp_li_hist_interval_new(ccid3_li_hist,
891 &hcrx->ccid3hcrx_li_hist,
892 seq_loss, win_loss);
893 if (li_tail == NULL)
894 return;
895 li_tail->dccplih_interval = ccid3_hc_rx_calc_first_li(sk);
896 } else
897 LIMIT_NETDEBUG(KERN_WARNING "%s: FIXME: find end of "
898 "interval\n", __FUNCTION__);
899 }
900
901 static void ccid3_hc_rx_detect_loss(struct sock *sk)
902 {
903 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
904 u8 win_loss;
905 const u64 seq_loss = dccp_rx_hist_detect_loss(&hcrx->ccid3hcrx_hist,
906 &hcrx->ccid3hcrx_li_hist,
907 &win_loss);
908
909 ccid3_hc_rx_update_li(sk, seq_loss, win_loss);
910 }
911
912 static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
913 {
914 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
915 const struct dccp_options_received *opt_recv;
916 struct dccp_rx_hist_entry *packet;
917 struct timeval now;
918 u8 win_count;
919 u32 p_prev, r_sample, t_elapsed;
920 int ins;
921
922 BUG_ON(hcrx == NULL ||
923 !(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA ||
924 hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA));
925
926 opt_recv = &dccp_sk(sk)->dccps_options_received;
927
928 switch (DCCP_SKB_CB(skb)->dccpd_type) {
929 case DCCP_PKT_ACK:
930 if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
931 return;
932 case DCCP_PKT_DATAACK:
933 if (opt_recv->dccpor_timestamp_echo == 0)
934 break;
935 p_prev = hcrx->ccid3hcrx_rtt;
936 dccp_timestamp(sk, &now);
937 timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10);
938 r_sample = timeval_usecs(&now);
939 t_elapsed = opt_recv->dccpor_elapsed_time * 10;
940
941 if (unlikely(r_sample <= t_elapsed))
942 LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, "
943 "t_elapsed=%uus\n",
944 __FUNCTION__, r_sample, t_elapsed);
945 else
946 r_sample -= t_elapsed;
947
948 if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
949 hcrx->ccid3hcrx_rtt = r_sample;
950 else
951 hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 +
952 r_sample / 10;
953
954 if (p_prev != hcrx->ccid3hcrx_rtt)
955 ccid3_pr_debug("%s, New RTT=%luus, elapsed time=%u\n",
956 dccp_role(sk), hcrx->ccid3hcrx_rtt,
957 opt_recv->dccpor_elapsed_time);
958 break;
959 case DCCP_PKT_DATA:
960 break;
961 default: /* We're not interested in other packet types, move along */
962 return;
963 }
964
965 packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp,
966 skb, SLAB_ATOMIC);
967 if (unlikely(packet == NULL)) {
968 LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Not enough mem to "
969 "add rx packet to history, consider it lost!\n",
970 __FUNCTION__, dccp_role(sk), sk);
971 return;
972 }
973
974 win_count = packet->dccphrx_ccval;
975
976 ins = dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist,
977 &hcrx->ccid3hcrx_li_hist, packet);
978
979 if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK)
980 return;
981
982 switch (hcrx->ccid3hcrx_state) {
983 case TFRC_RSTATE_NO_DATA:
984 ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial "
985 "feedback\n",
986 dccp_role(sk), sk,
987 dccp_state_name(sk->sk_state), skb);
988 ccid3_hc_rx_send_feedback(sk);
989 ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA);
990 return;
991 case TFRC_RSTATE_DATA:
992 hcrx->ccid3hcrx_bytes_recv += skb->len -
993 dccp_hdr(skb)->dccph_doff * 4;
994 if (ins != 0)
995 break;
996
997 dccp_timestamp(sk, &now);
998 if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >=
999 hcrx->ccid3hcrx_rtt) {
1000 hcrx->ccid3hcrx_tstamp_last_ack = now;
1001 ccid3_hc_rx_send_feedback(sk);
1002 }
1003 return;
1004 default:
1005 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
1006 __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state);
1007 dump_stack();
1008 return;
1009 }
1010
1011 /* Dealing with packet loss */
1012 ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n",
1013 dccp_role(sk), sk, dccp_state_name(sk->sk_state));
1014
1015 ccid3_hc_rx_detect_loss(sk);
1016 p_prev = hcrx->ccid3hcrx_p;
1017
1018 /* Calculate loss event rate */
1019 if (!list_empty(&hcrx->ccid3hcrx_li_hist)) {
1020 u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist);
1021
1022 /* Scaling up by 1000000 as fixed decimal */
1023 if (i_mean != 0)
1024 hcrx->ccid3hcrx_p = 1000000 / i_mean;
1025 }
1026
1027 if (hcrx->ccid3hcrx_p > p_prev) {
1028 ccid3_hc_rx_send_feedback(sk);
1029 return;
1030 }
1031 }
1032
1033 static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk)
1034 {
1035 struct dccp_sock *dp = dccp_sk(sk);
1036 struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid);
1037
1038 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
1039
1040 if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE &&
1041 dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE)
1042 hcrx->ccid3hcrx_s = dp->dccps_packet_size;
1043 else
1044 hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE;
1045
1046 hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA;
1047 INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist);
1048 INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist);
1049 dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack);
1050 hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack;
1051 hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */
1052 return 0;
1053 }
1054
1055 static void ccid3_hc_rx_exit(struct sock *sk)
1056 {
1057 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
1058
1059 BUG_ON(hcrx == NULL);
1060
1061 ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM);
1062
1063 /* Empty packet history */
1064 dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist);
1065
1066 /* Empty loss interval history */
1067 dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist);
1068 }
1069
1070 static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info)
1071 {
1072 const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
1073
1074 /* Listen socks doesn't have a private CCID block */
1075 if (sk->sk_state == DCCP_LISTEN)
1076 return;
1077
1078 BUG_ON(hcrx == NULL);
1079
1080 info->tcpi_ca_state = hcrx->ccid3hcrx_state;
1081 info->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1082 info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt;
1083 }
1084
1085 static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info)
1086 {
1087 const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
1088
1089 /* Listen socks doesn't have a private CCID block */
1090 if (sk->sk_state == DCCP_LISTEN)
1091 return;
1092
1093 BUG_ON(hctx == NULL);
1094
1095 info->tcpi_rto = hctx->ccid3hctx_t_rto;
1096 info->tcpi_rtt = hctx->ccid3hctx_rtt;
1097 }
1098
1099 static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
1100 u32 __user *optval, int __user *optlen)
1101 {
1102 const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
1103 const void *val;
1104
1105 /* Listen socks doesn't have a private CCID block */
1106 if (sk->sk_state == DCCP_LISTEN)
1107 return -EINVAL;
1108
1109 switch (optname) {
1110 case DCCP_SOCKOPT_CCID_RX_INFO:
1111 if (len < sizeof(hcrx->ccid3hcrx_tfrc))
1112 return -EINVAL;
1113 len = sizeof(hcrx->ccid3hcrx_tfrc);
1114 val = &hcrx->ccid3hcrx_tfrc;
1115 break;
1116 default:
1117 return -ENOPROTOOPT;
1118 }
1119
1120 if (put_user(len, optlen) || copy_to_user(optval, val, len))
1121 return -EFAULT;
1122
1123 return 0;
1124 }
1125
1126 static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len,
1127 u32 __user *optval, int __user *optlen)
1128 {
1129 const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
1130 const void *val;
1131
1132 /* Listen socks doesn't have a private CCID block */
1133 if (sk->sk_state == DCCP_LISTEN)
1134 return -EINVAL;
1135
1136 switch (optname) {
1137 case DCCP_SOCKOPT_CCID_TX_INFO:
1138 if (len < sizeof(hctx->ccid3hctx_tfrc))
1139 return -EINVAL;
1140 len = sizeof(hctx->ccid3hctx_tfrc);
1141 val = &hctx->ccid3hctx_tfrc;
1142 break;
1143 default:
1144 return -ENOPROTOOPT;
1145 }
1146
1147 if (put_user(len, optlen) || copy_to_user(optval, val, len))
1148 return -EFAULT;
1149
1150 return 0;
1151 }
1152
1153 static struct ccid_operations ccid3 = {
1154 .ccid_id = 3,
1155 .ccid_name = "ccid3",
1156 .ccid_owner = THIS_MODULE,
1157 .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock),
1158 .ccid_hc_tx_init = ccid3_hc_tx_init,
1159 .ccid_hc_tx_exit = ccid3_hc_tx_exit,
1160 .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet,
1161 .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent,
1162 .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv,
1163 .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options,
1164 .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options,
1165 .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock),
1166 .ccid_hc_rx_init = ccid3_hc_rx_init,
1167 .ccid_hc_rx_exit = ccid3_hc_rx_exit,
1168 .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options,
1169 .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv,
1170 .ccid_hc_rx_get_info = ccid3_hc_rx_get_info,
1171 .ccid_hc_tx_get_info = ccid3_hc_tx_get_info,
1172 .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt,
1173 .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt,
1174 };
1175
1176 module_param(ccid3_debug, int, 0444);
1177 MODULE_PARM_DESC(ccid3_debug, "Enable debug messages");
1178
1179 static __init int ccid3_module_init(void)
1180 {
1181 int rc = -ENOBUFS;
1182
1183 ccid3_rx_hist = dccp_rx_hist_new("ccid3");
1184 if (ccid3_rx_hist == NULL)
1185 goto out;
1186
1187 ccid3_tx_hist = dccp_tx_hist_new("ccid3");
1188 if (ccid3_tx_hist == NULL)
1189 goto out_free_rx;
1190
1191 ccid3_li_hist = dccp_li_hist_new("ccid3");
1192 if (ccid3_li_hist == NULL)
1193 goto out_free_tx;
1194
1195 rc = ccid_register(&ccid3);
1196 if (rc != 0)
1197 goto out_free_loss_interval_history;
1198 out:
1199 return rc;
1200
1201 out_free_loss_interval_history:
1202 dccp_li_hist_delete(ccid3_li_hist);
1203 ccid3_li_hist = NULL;
1204 out_free_tx:
1205 dccp_tx_hist_delete(ccid3_tx_hist);
1206 ccid3_tx_hist = NULL;
1207 out_free_rx:
1208 dccp_rx_hist_delete(ccid3_rx_hist);
1209 ccid3_rx_hist = NULL;
1210 goto out;
1211 }
1212 module_init(ccid3_module_init);
1213
1214 static __exit void ccid3_module_exit(void)
1215 {
1216 ccid_unregister(&ccid3);
1217
1218 if (ccid3_tx_hist != NULL) {
1219 dccp_tx_hist_delete(ccid3_tx_hist);
1220 ccid3_tx_hist = NULL;
1221 }
1222 if (ccid3_rx_hist != NULL) {
1223 dccp_rx_hist_delete(ccid3_rx_hist);
1224 ccid3_rx_hist = NULL;
1225 }
1226 if (ccid3_li_hist != NULL) {
1227 dccp_li_hist_delete(ccid3_li_hist);
1228 ccid3_li_hist = NULL;
1229 }
1230 }
1231 module_exit(ccid3_module_exit);
1232
1233 MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, "
1234 "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
1235 MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID");
1236 MODULE_LICENSE("GPL");
1237 MODULE_ALIAS("net-dccp-ccid-3");