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[CONNECTOR]: Initialize subsystem earlier.
[linux-2.6/verdex.git] / net / dccp / ccids / ccid3.c
blobb4a51d0355a58f590d721d09833307d60b87188e
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 <imcdnzl@gmail.com>
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 <linux/config.h>
38 #include "../ccid.h"
39 #include "../dccp.h"
40 #include "lib/packet_history.h"
41 #include "lib/loss_interval.h"
42 #include "lib/tfrc.h"
43 #include "ccid3.h"
44
45 /*
46 * Reason for maths here is to avoid 32 bit overflow when a is big.
47 * With this we get close to the limit.
48 */
49 static u32 usecs_div(const u32 a, const u32 b)
50 {
51 const u32 div = a < (UINT_MAX / (USEC_PER_SEC / 10)) ? 10 :
52 a < (UINT_MAX / (USEC_PER_SEC / 50)) ? 50 :
53 a < (UINT_MAX / (USEC_PER_SEC / 100)) ? 100 :
54 a < (UINT_MAX / (USEC_PER_SEC / 500)) ? 500 :
55 a < (UINT_MAX / (USEC_PER_SEC / 1000)) ? 1000 :
56 a < (UINT_MAX / (USEC_PER_SEC / 5000)) ? 5000 :
57 a < (UINT_MAX / (USEC_PER_SEC / 10000)) ? 10000 :
58 a < (UINT_MAX / (USEC_PER_SEC / 50000)) ? 50000 :
59 100000;
60 const u32 tmp = a * (USEC_PER_SEC / div);
61 return (b >= 2 * div) ? tmp / (b / div) : tmp;
62 }
63
64 static int ccid3_debug;
65
66 #ifdef CCID3_DEBUG
67 #define ccid3_pr_debug(format, a...) \
68 do { if (ccid3_debug) \
69 printk(KERN_DEBUG "%s: " format, __FUNCTION__, ##a); \
70 } while (0)
71 #else
72 #define ccid3_pr_debug(format, a...)
73 #endif
74
75 static struct dccp_tx_hist *ccid3_tx_hist;
76 static struct dccp_rx_hist *ccid3_rx_hist;
77 static struct dccp_li_hist *ccid3_li_hist;
78
79 /* TFRC sender states */
80 enum ccid3_hc_tx_states {
81 TFRC_SSTATE_NO_SENT = 1,
82 TFRC_SSTATE_NO_FBACK,
83 TFRC_SSTATE_FBACK,
84 TFRC_SSTATE_TERM,
85 };
86
87 #ifdef CCID3_DEBUG
88 static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state)
89 {
90 static char *ccid3_state_names[] = {
91 [TFRC_SSTATE_NO_SENT] = "NO_SENT",
92 [TFRC_SSTATE_NO_FBACK] = "NO_FBACK",
93 [TFRC_SSTATE_FBACK] = "FBACK",
94 [TFRC_SSTATE_TERM] = "TERM",
95 };
96
97 return ccid3_state_names[state];
98 }
99 #endif
100
101 static void ccid3_hc_tx_set_state(struct sock *sk,
102 enum ccid3_hc_tx_states state)
103 {
104 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
105 enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state;
106
107 ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
108 dccp_role(sk), sk, ccid3_tx_state_name(oldstate),
109 ccid3_tx_state_name(state));
110 WARN_ON(state == oldstate);
111 hctx->ccid3hctx_state = state;
112 }
113
114 /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */
115 static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock *hctx)
116 {
117 /*
118 * If no feedback spec says t_ipi is 1 second (set elsewhere and then
119 * doubles after every no feedback timer (separate function)
120 */
121 if (hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK)
122 hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s,
123 hctx->ccid3hctx_x);
124 }
125
126 /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */
127 static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx)
128 {
129 hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2,
130 TFRC_OPSYS_HALF_TIME_GRAN);
131 }
132
133 /*
134 * Update X by
135 * If (p > 0)
136 * x_calc = calcX(s, R, p);
137 * X = max(min(X_calc, 2 * X_recv), s / t_mbi);
138 * Else
139 * If (now - tld >= R)
140 * X = max(min(2 * X, 2 * X_recv), s / R);
141 * tld = now;
142 */
143 static void ccid3_hc_tx_update_x(struct sock *sk)
144 {
145 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
146
147 /* To avoid large error in calcX */
148 if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) {
149 hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s,
150 hctx->ccid3hctx_rtt,
151 hctx->ccid3hctx_p);
152 hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc,
153 2 * hctx->ccid3hctx_x_recv),
154 (hctx->ccid3hctx_s /
155 TFRC_MAX_BACK_OFF_TIME));
156 } else {
157 struct timeval now;
158
159 dccp_timestamp(sk, &now);
160 if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >=
161 hctx->ccid3hctx_rtt) {
162 hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv,
163 hctx->ccid3hctx_x) * 2,
164 usecs_div(hctx->ccid3hctx_s,
165 hctx->ccid3hctx_rtt));
166 hctx->ccid3hctx_t_ld = now;
167 }
168 }
169 }
170
171 static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
172 {
173 struct sock *sk = (struct sock *)data;
174 unsigned long next_tmout = 0;
175 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
176
177 bh_lock_sock(sk);
178 if (sock_owned_by_user(sk)) {
179 /* Try again later. */
180 /* XXX: set some sensible MIB */
181 sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
182 jiffies + HZ / 5);
183 goto out;
184 }
185
186 ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk,
187 ccid3_tx_state_name(hctx->ccid3hctx_state));
188
189 switch (hctx->ccid3hctx_state) {
190 case TFRC_SSTATE_TERM:
191 goto out;
192 case TFRC_SSTATE_NO_FBACK:
193 /* Halve send rate */
194 hctx->ccid3hctx_x /= 2;
195 if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s /
196 TFRC_MAX_BACK_OFF_TIME))
197 hctx->ccid3hctx_x = (hctx->ccid3hctx_s /
198 TFRC_MAX_BACK_OFF_TIME);
199
200 ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d "
201 "bytes/s\n",
202 dccp_role(sk), sk,
203 ccid3_tx_state_name(hctx->ccid3hctx_state),
204 hctx->ccid3hctx_x);
205 next_tmout = max_t(u32, 2 * usecs_div(hctx->ccid3hctx_s,
206 hctx->ccid3hctx_x),
207 TFRC_INITIAL_TIMEOUT);
208 /*
209 * FIXME - not sure above calculation is correct. See section
210 * 5 of CCID3 11 should adjust tx_t_ipi and double that to
211 * achieve it really
212 */
213 break;
214 case TFRC_SSTATE_FBACK:
215 /*
216 * Check if IDLE since last timeout and recv rate is less than
217 * 4 packets per RTT
218 */
219 if (!hctx->ccid3hctx_idle ||
220 (hctx->ccid3hctx_x_recv >=
221 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) {
222 ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n",
223 dccp_role(sk), sk,
224 ccid3_tx_state_name(hctx->ccid3hctx_state));
225 /* Halve sending rate */
226
227 /* If (X_calc > 2 * X_recv)
228 * X_recv = max(X_recv / 2, s / (2 * t_mbi));
229 * Else
230 * X_recv = X_calc / 4;
231 */
232 BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P &&
233 hctx->ccid3hctx_x_calc == 0);
234
235 /* check also if p is zero -> x_calc is infinity? */
236 if (hctx->ccid3hctx_p < TFRC_SMALLEST_P ||
237 hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv)
238 hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2,
239 hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME));
240 else
241 hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4;
242
243 /* Update sending rate */
244 ccid3_hc_tx_update_x(sk);
245 }
246 /*
247 * Schedule no feedback timer to expire in
248 * max(4 * R, 2 * s / X)
249 */
250 next_tmout = max_t(u32, hctx->ccid3hctx_t_rto,
251 2 * usecs_div(hctx->ccid3hctx_s,
252 hctx->ccid3hctx_x));
253 break;
254 default:
255 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
256 __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
257 dump_stack();
258 goto out;
259 }
260
261 sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
262 jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout)));
263 hctx->ccid3hctx_idle = 1;
264 out:
265 bh_unlock_sock(sk);
266 sock_put(sk);
267 }
268
269 static int ccid3_hc_tx_send_packet(struct sock *sk,
270 struct sk_buff *skb, int len)
271 {
272 struct dccp_sock *dp = dccp_sk(sk);
273 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
274 struct dccp_tx_hist_entry *new_packet;
275 struct timeval now;
276 long delay;
277 int rc = -ENOTCONN;
278
279 BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM);
280
281 /* Check if pure ACK or Terminating*/
282 /*
283 * XXX: We only call this function for DATA and DATAACK, on, these
284 * packets can have zero length, but why the comment about "pure ACK"?
285 */
286 if (unlikely(len == 0))
287 goto out;
288
289 /* See if last packet allocated was not sent */
290 new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
291 if (new_packet == NULL || new_packet->dccphtx_sent) {
292 new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist,
293 SLAB_ATOMIC);
294
295 rc = -ENOBUFS;
296 if (unlikely(new_packet == NULL)) {
297 LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, not enough "
298 "mem to add to history, send refused\n",
299 __FUNCTION__, dccp_role(sk), sk);
300 goto out;
301 }
302
303 dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet);
304 }
305
306 dccp_timestamp(sk, &now);
307
308 switch (hctx->ccid3hctx_state) {
309 case TFRC_SSTATE_NO_SENT:
310 sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
311 jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT));
312 hctx->ccid3hctx_last_win_count = 0;
313 hctx->ccid3hctx_t_last_win_count = now;
314 ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK);
315 hctx->ccid3hctx_t_ipi = TFRC_INITIAL_IPI;
316
317 /* Set nominal send time for initial packet */
318 hctx->ccid3hctx_t_nom = now;
319 timeval_add_usecs(&hctx->ccid3hctx_t_nom,
320 hctx->ccid3hctx_t_ipi);
321 ccid3_calc_new_delta(hctx);
322 rc = 0;
323 break;
324 case TFRC_SSTATE_NO_FBACK:
325 case TFRC_SSTATE_FBACK:
326 delay = (timeval_delta(&now, &hctx->ccid3hctx_t_nom) -
327 hctx->ccid3hctx_delta);
328 delay /= -1000;
329 /* divide by -1000 is to convert to ms and get sign right */
330 rc = delay > 0 ? delay : 0;
331 break;
332 default:
333 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
334 __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
335 dump_stack();
336 rc = -EINVAL;
337 break;
338 }
339
340 /* Can we send? if so add options and add to packet history */
341 if (rc == 0) {
342 dp->dccps_hc_tx_insert_options = 1;
343 new_packet->dccphtx_ccval =
344 DCCP_SKB_CB(skb)->dccpd_ccval =
345 hctx->ccid3hctx_last_win_count;
346 }
347 out:
348 return rc;
349 }
350
351 static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
352 {
353 const struct dccp_sock *dp = dccp_sk(sk);
354 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
355 struct timeval now;
356
357 BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM);
358
359 dccp_timestamp(sk, &now);
360
361 /* check if we have sent a data packet */
362 if (len > 0) {
363 unsigned long quarter_rtt;
364 struct dccp_tx_hist_entry *packet;
365
366 packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
367 if (unlikely(packet == NULL)) {
368 LIMIT_NETDEBUG(KERN_WARNING "%s: packet doesn't "
369 "exists in history!\n", __FUNCTION__);
370 return;
371 }
372 if (unlikely(packet->dccphtx_sent)) {
373 LIMIT_NETDEBUG(KERN_WARNING "%s: no unsent packet in "
374 "history!\n", __FUNCTION__);
375 return;
376 }
377 packet->dccphtx_tstamp = now;
378 packet->dccphtx_seqno = dp->dccps_gss;
379 /*
380 * Check if win_count have changed
381 * Algorithm in "8.1. Window Counter Valuer" in
382 * draft-ietf-dccp-ccid3-11.txt
383 */
384 quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count);
385 if (likely(hctx->ccid3hctx_rtt > 8))
386 quarter_rtt /= hctx->ccid3hctx_rtt / 4;
387
388 if (quarter_rtt > 0) {
389 hctx->ccid3hctx_t_last_win_count = now;
390 hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count +
391 min_t(unsigned long, quarter_rtt, 5)) % 16;
392 ccid3_pr_debug("%s, sk=%p, window changed from "
393 "%u to %u!\n",
394 dccp_role(sk), sk,
395 packet->dccphtx_ccval,
396 hctx->ccid3hctx_last_win_count);
397 }
398
399 hctx->ccid3hctx_idle = 0;
400 packet->dccphtx_rtt = hctx->ccid3hctx_rtt;
401 packet->dccphtx_sent = 1;
402 } else
403 ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n",
404 dccp_role(sk), sk, dp->dccps_gss);
405
406 switch (hctx->ccid3hctx_state) {
407 case TFRC_SSTATE_NO_SENT:
408 /* if first wasn't pure ack */
409 if (len != 0)
410 printk(KERN_CRIT "%s: %s, First packet sent is noted "
411 "as a data packet\n",
412 __FUNCTION__, dccp_role(sk));
413 return;
414 case TFRC_SSTATE_NO_FBACK:
415 case TFRC_SSTATE_FBACK:
416 if (len > 0) {
417 hctx->ccid3hctx_t_nom = now;
418 ccid3_calc_new_t_ipi(hctx);
419 ccid3_calc_new_delta(hctx);
420 timeval_add_usecs(&hctx->ccid3hctx_t_nom,
421 hctx->ccid3hctx_t_ipi);
422 }
423 break;
424 default:
425 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
426 __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
427 dump_stack();
428 break;
429 }
430 }
431
432 static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
433 {
434 const struct dccp_sock *dp = dccp_sk(sk);
435 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
436 struct ccid3_options_received *opt_recv;
437 struct dccp_tx_hist_entry *packet;
438 struct timeval now;
439 unsigned long next_tmout;
440 u32 t_elapsed;
441 u32 pinv;
442 u32 x_recv;
443 u32 r_sample;
444
445 BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM);
446
447 /* we are only interested in ACKs */
448 if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK ||
449 DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK))
450 return;
451
452 opt_recv = &hctx->ccid3hctx_options_received;
453
454 t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10;
455 x_recv = opt_recv->ccid3or_receive_rate;
456 pinv = opt_recv->ccid3or_loss_event_rate;
457
458 switch (hctx->ccid3hctx_state) {
459 case TFRC_SSTATE_NO_SENT:
460 /* FIXME: what to do here? */
461 return;
462 case TFRC_SSTATE_NO_FBACK:
463 case TFRC_SSTATE_FBACK:
464 /* Calculate new round trip sample by
465 * R_sample = (now - t_recvdata) - t_delay */
466 /* get t_recvdata from history */
467 packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist,
468 DCCP_SKB_CB(skb)->dccpd_ack_seq);
469 if (unlikely(packet == NULL)) {
470 LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, seqno "
471 "%llu(%s) does't exist in history!\n",
472 __FUNCTION__, dccp_role(sk), sk,
473 (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq,
474 dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
475 return;
476 }
477
478 /* Update RTT */
479 dccp_timestamp(sk, &now);
480 r_sample = timeval_delta(&now, &packet->dccphtx_tstamp);
481 if (unlikely(r_sample <= t_elapsed))
482 LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, "
483 "t_elapsed=%uus\n",
484 __FUNCTION__, r_sample, t_elapsed);
485 else
486 r_sample -= t_elapsed;
487
488 /* Update RTT estimate by
489 * If (No feedback recv)
490 * R = R_sample;
491 * Else
492 * R = q * R + (1 - q) * R_sample;
493 *
494 * q is a constant, RFC 3448 recomments 0.9
495 */
496 if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) {
497 ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK);
498 hctx->ccid3hctx_rtt = r_sample;
499 } else
500 hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 +
501 r_sample / 10;
502
503 ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, "
504 "r_sample=%us\n", dccp_role(sk), sk,
505 hctx->ccid3hctx_rtt, r_sample);
506
507 /* Update timeout interval */
508 hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt,
509 USEC_PER_SEC);
510
511 /* Update receive rate */
512 hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */
513
514 /* Update loss event rate */
515 if (pinv == ~0 || pinv == 0)
516 hctx->ccid3hctx_p = 0;
517 else {
518 hctx->ccid3hctx_p = 1000000 / pinv;
519
520 if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) {
521 hctx->ccid3hctx_p = TFRC_SMALLEST_P;
522 ccid3_pr_debug("%s, sk=%p, Smallest p used!\n",
523 dccp_role(sk), sk);
524 }
525 }
526
527 /* unschedule no feedback timer */
528 sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
529
530 /* Update sending rate */
531 ccid3_hc_tx_update_x(sk);
532
533 /* Update next send time */
534 timeval_sub_usecs(&hctx->ccid3hctx_t_nom,
535 hctx->ccid3hctx_t_ipi);
536 ccid3_calc_new_t_ipi(hctx);
537 timeval_add_usecs(&hctx->ccid3hctx_t_nom,
538 hctx->ccid3hctx_t_ipi);
539 ccid3_calc_new_delta(hctx);
540
541 /* remove all packets older than the one acked from history */
542 dccp_tx_hist_purge_older(ccid3_tx_hist,
543 &hctx->ccid3hctx_hist, packet);
544 /*
545 * As we have calculated new ipi, delta, t_nom it is possible that
546 * we now can send a packet, so wake up dccp_wait_for_ccids.
547 */
548 sk->sk_write_space(sk);
549
550 /*
551 * Schedule no feedback timer to expire in
552 * max(4 * R, 2 * s / X)
553 */
554 next_tmout = max(hctx->ccid3hctx_t_rto,
555 2 * usecs_div(hctx->ccid3hctx_s,
556 hctx->ccid3hctx_x));
557
558 ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to "
559 "expire in %lu jiffies (%luus)\n",
560 dccp_role(sk), sk,
561 usecs_to_jiffies(next_tmout), next_tmout);
562
563 sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
564 jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout)));
565
566 /* set idle flag */
567 hctx->ccid3hctx_idle = 1;
568 break;
569 default:
570 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
571 __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
572 dump_stack();
573 break;
574 }
575 }
576
577 static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb)
578 {
579 const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
580
581 BUG_ON(hctx == NULL);
582
583 if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)
584 DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count;
585 return 0;
586 }
587
588 static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
589 unsigned char len, u16 idx,
590 unsigned char *value)
591 {
592 int rc = 0;
593 const struct dccp_sock *dp = dccp_sk(sk);
594 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
595 struct ccid3_options_received *opt_recv;
596
597 BUG_ON(hctx == NULL);
598
599 opt_recv = &hctx->ccid3hctx_options_received;
600
601 if (opt_recv->ccid3or_seqno != dp->dccps_gsr) {
602 opt_recv->ccid3or_seqno = dp->dccps_gsr;
603 opt_recv->ccid3or_loss_event_rate = ~0;
604 opt_recv->ccid3or_loss_intervals_idx = 0;
605 opt_recv->ccid3or_loss_intervals_len = 0;
606 opt_recv->ccid3or_receive_rate = 0;
607 }
608
609 switch (option) {
610 case TFRC_OPT_LOSS_EVENT_RATE:
611 if (unlikely(len != 4)) {
612 LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid "
613 "len for TFRC_OPT_LOSS_EVENT_RATE\n",
614 __FUNCTION__, dccp_role(sk), sk);
615 rc = -EINVAL;
616 } else {
617 opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value);
618 ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n",
619 dccp_role(sk), sk,
620 opt_recv->ccid3or_loss_event_rate);
621 }
622 break;
623 case TFRC_OPT_LOSS_INTERVALS:
624 opt_recv->ccid3or_loss_intervals_idx = idx;
625 opt_recv->ccid3or_loss_intervals_len = len;
626 ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n",
627 dccp_role(sk), sk,
628 opt_recv->ccid3or_loss_intervals_idx,
629 opt_recv->ccid3or_loss_intervals_len);
630 break;
631 case TFRC_OPT_RECEIVE_RATE:
632 if (unlikely(len != 4)) {
633 LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid "
634 "len for TFRC_OPT_RECEIVE_RATE\n",
635 __FUNCTION__, dccp_role(sk), sk);
636 rc = -EINVAL;
637 } else {
638 opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value);
639 ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n",
640 dccp_role(sk), sk,
641 opt_recv->ccid3or_receive_rate);
642 }
643 break;
644 }
645
646 return rc;
647 }
648
649 static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk)
650 {
651 struct dccp_sock *dp = dccp_sk(sk);
652 struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid);
653
654 if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE &&
655 dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE)
656 hctx->ccid3hctx_s = dp->dccps_packet_size;
657 else
658 hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE;
659
660 /* Set transmission rate to 1 packet per second */
661 hctx->ccid3hctx_x = hctx->ccid3hctx_s;
662 hctx->ccid3hctx_t_rto = USEC_PER_SEC;
663 hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT;
664 INIT_LIST_HEAD(&hctx->ccid3hctx_hist);
665
666 hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer;
667 hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk;
668 init_timer(&hctx->ccid3hctx_no_feedback_timer);
669
670 return 0;
671 }
672
673 static void ccid3_hc_tx_exit(struct sock *sk)
674 {
675 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
676
677 BUG_ON(hctx == NULL);
678
679 ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM);
680 sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
681
682 /* Empty packet history */
683 dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist);
684 }
685
686 /*
687 * RX Half Connection methods
688 */
689
690 /* TFRC receiver states */
691 enum ccid3_hc_rx_states {
692 TFRC_RSTATE_NO_DATA = 1,
693 TFRC_RSTATE_DATA,
694 TFRC_RSTATE_TERM = 127,
695 };
696
697 #ifdef CCID3_DEBUG
698 static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state)
699 {
700 static char *ccid3_rx_state_names[] = {
701 [TFRC_RSTATE_NO_DATA] = "NO_DATA",
702 [TFRC_RSTATE_DATA] = "DATA",
703 [TFRC_RSTATE_TERM] = "TERM",
704 };
705
706 return ccid3_rx_state_names[state];
707 }
708 #endif
709
710 static void ccid3_hc_rx_set_state(struct sock *sk,
711 enum ccid3_hc_rx_states state)
712 {
713 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
714 enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state;
715
716 ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
717 dccp_role(sk), sk, ccid3_rx_state_name(oldstate),
718 ccid3_rx_state_name(state));
719 WARN_ON(state == oldstate);
720 hcrx->ccid3hcrx_state = state;
721 }
722
723 static void ccid3_hc_rx_send_feedback(struct sock *sk)
724 {
725 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
726 struct dccp_sock *dp = dccp_sk(sk);
727 struct dccp_rx_hist_entry *packet;
728 struct timeval now;
729
730 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
731
732 dccp_timestamp(sk, &now);
733
734 switch (hcrx->ccid3hcrx_state) {
735 case TFRC_RSTATE_NO_DATA:
736 hcrx->ccid3hcrx_x_recv = 0;
737 break;
738 case TFRC_RSTATE_DATA: {
739 const u32 delta = timeval_delta(&now,
740 &hcrx->ccid3hcrx_tstamp_last_feedback);
741 hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv,
742 delta);
743 }
744 break;
745 default:
746 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
747 __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state);
748 dump_stack();
749 return;
750 }
751
752 packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist);
753 if (unlikely(packet == NULL)) {
754 LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, no data packet "
755 "in history!\n",
756 __FUNCTION__, dccp_role(sk), sk);
757 return;
758 }
759
760 hcrx->ccid3hcrx_tstamp_last_feedback = now;
761 hcrx->ccid3hcrx_last_counter = packet->dccphrx_ccval;
762 hcrx->ccid3hcrx_seqno_last_counter = packet->dccphrx_seqno;
763 hcrx->ccid3hcrx_bytes_recv = 0;
764
765 /* Convert to multiples of 10us */
766 hcrx->ccid3hcrx_elapsed_time =
767 timeval_delta(&now, &packet->dccphrx_tstamp) / 10;
768 if (hcrx->ccid3hcrx_p == 0)
769 hcrx->ccid3hcrx_pinv = ~0;
770 else
771 hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p;
772 dp->dccps_hc_rx_insert_options = 1;
773 dccp_send_ack(sk);
774 }
775
776 static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
777 {
778 const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
779 __be32 x_recv, pinv;
780
781 BUG_ON(hcrx == NULL);
782
783 if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN))
784 return 0;
785
786 DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_last_counter;
787
788 if (dccp_packet_without_ack(skb))
789 return 0;
790
791 x_recv = htonl(hcrx->ccid3hcrx_x_recv);
792 pinv = htonl(hcrx->ccid3hcrx_pinv);
793
794 if ((hcrx->ccid3hcrx_elapsed_time != 0 &&
795 dccp_insert_option_elapsed_time(sk, skb,
796 hcrx->ccid3hcrx_elapsed_time)) ||
797 dccp_insert_option_timestamp(sk, skb) ||
798 dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE,
799 &pinv, sizeof(pinv)) ||
800 dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE,
801 &x_recv, sizeof(x_recv)))
802 return -1;
803
804 return 0;
805 }
806
807 /* calculate first loss interval
808 *
809 * returns estimated loss interval in usecs */
810
811 static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
812 {
813 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
814 struct dccp_rx_hist_entry *entry, *next, *tail = NULL;
815 u32 rtt, delta, x_recv, fval, p, tmp2;
816 struct timeval tstamp = { 0, };
817 int interval = 0;
818 int win_count = 0;
819 int step = 0;
820 u64 tmp1;
821
822 list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist,
823 dccphrx_node) {
824 if (dccp_rx_hist_entry_data_packet(entry)) {
825 tail = entry;
826
827 switch (step) {
828 case 0:
829 tstamp = entry->dccphrx_tstamp;
830 win_count = entry->dccphrx_ccval;
831 step = 1;
832 break;
833 case 1:
834 interval = win_count - entry->dccphrx_ccval;
835 if (interval < 0)
836 interval += TFRC_WIN_COUNT_LIMIT;
837 if (interval > 4)
838 goto found;
839 break;
840 }
841 }
842 }
843
844 if (unlikely(step == 0)) {
845 LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, packet history "
846 "contains no data packets!\n",
847 __FUNCTION__, dccp_role(sk), sk);
848 return ~0;
849 }
850
851 if (unlikely(interval == 0)) {
852 LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Could not find a "
853 "win_count interval > 0. Defaulting to 1\n",
854 __FUNCTION__, dccp_role(sk), sk);
855 interval = 1;
856 }
857 found:
858 rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval;
859 ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n",
860 dccp_role(sk), sk, rtt);
861 if (rtt == 0)
862 rtt = 1;
863
864 dccp_timestamp(sk, &tstamp);
865 delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback);
866 x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta);
867
868 tmp1 = (u64)x_recv * (u64)rtt;
869 do_div(tmp1,10000000);
870 tmp2 = (u32)tmp1;
871 fval = (hcrx->ccid3hcrx_s * 100000) / tmp2;
872 /* do not alter order above or you will get overflow on 32 bit */
873 p = tfrc_calc_x_reverse_lookup(fval);
874 ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied "
875 "loss rate=%u\n", dccp_role(sk), sk, x_recv, p);
876
877 if (p == 0)
878 return ~0;
879 else
880 return 1000000 / p;
881 }
882
883 static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss)
884 {
885 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
886
887 if (seq_loss != DCCP_MAX_SEQNO + 1 &&
888 list_empty(&hcrx->ccid3hcrx_li_hist)) {
889 struct dccp_li_hist_entry *li_tail;
890
891 li_tail = dccp_li_hist_interval_new(ccid3_li_hist,
892 &hcrx->ccid3hcrx_li_hist,
893 seq_loss, win_loss);
894 if (li_tail == NULL)
895 return;
896 li_tail->dccplih_interval = ccid3_hc_rx_calc_first_li(sk);
897 } else
898 LIMIT_NETDEBUG(KERN_WARNING "%s: FIXME: find end of "
899 "interval\n", __FUNCTION__);
900 }
901
902 static void ccid3_hc_rx_detect_loss(struct sock *sk)
903 {
904 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
905 u8 win_loss;
906 const u64 seq_loss = dccp_rx_hist_detect_loss(&hcrx->ccid3hcrx_hist,
907 &hcrx->ccid3hcrx_li_hist,
908 &win_loss);
909
910 ccid3_hc_rx_update_li(sk, seq_loss, win_loss);
911 }
912
913 static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
914 {
915 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
916 const struct dccp_options_received *opt_recv;
917 struct dccp_rx_hist_entry *packet;
918 struct timeval now;
919 u8 win_count;
920 u32 p_prev, r_sample, t_elapsed;
921 int ins;
922
923 BUG_ON(hcrx == NULL ||
924 !(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA ||
925 hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA));
926
927 opt_recv = &dccp_sk(sk)->dccps_options_received;
928
929 switch (DCCP_SKB_CB(skb)->dccpd_type) {
930 case DCCP_PKT_ACK:
931 if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
932 return;
933 case DCCP_PKT_DATAACK:
934 if (opt_recv->dccpor_timestamp_echo == 0)
935 break;
936 p_prev = hcrx->ccid3hcrx_rtt;
937 dccp_timestamp(sk, &now);
938 timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10);
939 r_sample = timeval_usecs(&now);
940 t_elapsed = opt_recv->dccpor_elapsed_time * 10;
941
942 if (unlikely(r_sample <= t_elapsed))
943 LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, "
944 "t_elapsed=%uus\n",
945 __FUNCTION__, r_sample, t_elapsed);
946 else
947 r_sample -= t_elapsed;
948
949 if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
950 hcrx->ccid3hcrx_rtt = r_sample;
951 else
952 hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 +
953 r_sample / 10;
954
955 if (p_prev != hcrx->ccid3hcrx_rtt)
956 ccid3_pr_debug("%s, New RTT=%luus, elapsed time=%u\n",
957 dccp_role(sk), hcrx->ccid3hcrx_rtt,
958 opt_recv->dccpor_elapsed_time);
959 break;
960 case DCCP_PKT_DATA:
961 break;
962 default: /* We're not interested in other packet types, move along */
963 return;
964 }
965
966 packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp,
967 skb, SLAB_ATOMIC);
968 if (unlikely(packet == NULL)) {
969 LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Not enough mem to "
970 "add rx packet to history, consider it lost!\n",
971 __FUNCTION__, dccp_role(sk), sk);
972 return;
973 }
974
975 win_count = packet->dccphrx_ccval;
976
977 ins = dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist,
978 &hcrx->ccid3hcrx_li_hist, packet);
979
980 if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK)
981 return;
982
983 switch (hcrx->ccid3hcrx_state) {
984 case TFRC_RSTATE_NO_DATA:
985 ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial "
986 "feedback\n",
987 dccp_role(sk), sk,
988 dccp_state_name(sk->sk_state), skb);
989 ccid3_hc_rx_send_feedback(sk);
990 ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA);
991 return;
992 case TFRC_RSTATE_DATA:
993 hcrx->ccid3hcrx_bytes_recv += skb->len -
994 dccp_hdr(skb)->dccph_doff * 4;
995 if (ins != 0)
996 break;
997
998 dccp_timestamp(sk, &now);
999 if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >=
1000 hcrx->ccid3hcrx_rtt) {
1001 hcrx->ccid3hcrx_tstamp_last_ack = now;
1002 ccid3_hc_rx_send_feedback(sk);
1003 }
1004 return;
1005 default:
1006 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
1007 __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state);
1008 dump_stack();
1009 return;
1010 }
1011
1012 /* Dealing with packet loss */
1013 ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n",
1014 dccp_role(sk), sk, dccp_state_name(sk->sk_state));
1015
1016 ccid3_hc_rx_detect_loss(sk);
1017 p_prev = hcrx->ccid3hcrx_p;
1018
1019 /* Calculate loss event rate */
1020 if (!list_empty(&hcrx->ccid3hcrx_li_hist)) {
1021 u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist);
1022
1023 /* Scaling up by 1000000 as fixed decimal */
1024 if (i_mean != 0)
1025 hcrx->ccid3hcrx_p = 1000000 / i_mean;
1026 }
1027
1028 if (hcrx->ccid3hcrx_p > p_prev) {
1029 ccid3_hc_rx_send_feedback(sk);
1030 return;
1031 }
1032 }
1033
1034 static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk)
1035 {
1036 struct dccp_sock *dp = dccp_sk(sk);
1037 struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid);
1038
1039 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
1040
1041 if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE &&
1042 dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE)
1043 hcrx->ccid3hcrx_s = dp->dccps_packet_size;
1044 else
1045 hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE;
1046
1047 hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA;
1048 INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist);
1049 INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist);
1050 dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack);
1051 hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack;
1052 hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */
1053 return 0;
1054 }
1055
1056 static void ccid3_hc_rx_exit(struct sock *sk)
1057 {
1058 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
1059
1060 BUG_ON(hcrx == NULL);
1061
1062 ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM);
1063
1064 /* Empty packet history */
1065 dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist);
1066
1067 /* Empty loss interval history */
1068 dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist);
1069 }
1070
1071 static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info)
1072 {
1073 const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
1074
1075 /* Listen socks doesn't have a private CCID block */
1076 if (sk->sk_state == DCCP_LISTEN)
1077 return;
1078
1079 BUG_ON(hcrx == NULL);
1080
1081 info->tcpi_ca_state = hcrx->ccid3hcrx_state;
1082 info->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1083 info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt;
1084 }
1085
1086 static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info)
1087 {
1088 const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
1089
1090 /* Listen socks doesn't have a private CCID block */
1091 if (sk->sk_state == DCCP_LISTEN)
1092 return;
1093
1094 BUG_ON(hctx == NULL);
1095
1096 info->tcpi_rto = hctx->ccid3hctx_t_rto;
1097 info->tcpi_rtt = hctx->ccid3hctx_rtt;
1098 }
1099
1100 static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
1101 u32 __user *optval, int __user *optlen)
1102 {
1103 const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
1104 const void *val;
1105
1106 /* Listen socks doesn't have a private CCID block */
1107 if (sk->sk_state == DCCP_LISTEN)
1108 return -EINVAL;
1109
1110 switch (optname) {
1111 case DCCP_SOCKOPT_CCID_RX_INFO:
1112 if (len < sizeof(hcrx->ccid3hcrx_tfrc))
1113 return -EINVAL;
1114 len = sizeof(hcrx->ccid3hcrx_tfrc);
1115 val = &hcrx->ccid3hcrx_tfrc;
1116 break;
1117 default:
1118 return -ENOPROTOOPT;
1119 }
1120
1121 if (put_user(len, optlen) || copy_to_user(optval, val, len))
1122 return -EFAULT;
1123
1124 return 0;
1125 }
1126
1127 static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len,
1128 u32 __user *optval, int __user *optlen)
1129 {
1130 const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
1131 const void *val;
1132
1133 /* Listen socks doesn't have a private CCID block */
1134 if (sk->sk_state == DCCP_LISTEN)
1135 return -EINVAL;
1136
1137 switch (optname) {
1138 case DCCP_SOCKOPT_CCID_TX_INFO:
1139 if (len < sizeof(hctx->ccid3hctx_tfrc))
1140 return -EINVAL;
1141 len = sizeof(hctx->ccid3hctx_tfrc);
1142 val = &hctx->ccid3hctx_tfrc;
1143 break;
1144 default:
1145 return -ENOPROTOOPT;
1146 }
1147
1148 if (put_user(len, optlen) || copy_to_user(optval, val, len))
1149 return -EFAULT;
1150
1151 return 0;
1152 }
1153
1154 static struct ccid_operations ccid3 = {
1155 .ccid_id = 3,
1156 .ccid_name = "ccid3",
1157 .ccid_owner = THIS_MODULE,
1158 .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock),
1159 .ccid_hc_tx_init = ccid3_hc_tx_init,
1160 .ccid_hc_tx_exit = ccid3_hc_tx_exit,
1161 .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet,
1162 .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent,
1163 .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv,
1164 .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options,
1165 .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options,
1166 .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock),
1167 .ccid_hc_rx_init = ccid3_hc_rx_init,
1168 .ccid_hc_rx_exit = ccid3_hc_rx_exit,
1169 .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options,
1170 .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv,
1171 .ccid_hc_rx_get_info = ccid3_hc_rx_get_info,
1172 .ccid_hc_tx_get_info = ccid3_hc_tx_get_info,
1173 .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt,
1174 .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt,
1175 };
1176
1177 module_param(ccid3_debug, int, 0444);
1178 MODULE_PARM_DESC(ccid3_debug, "Enable debug messages");
1179
1180 static __init int ccid3_module_init(void)
1181 {
1182 int rc = -ENOBUFS;
1183
1184 ccid3_rx_hist = dccp_rx_hist_new("ccid3");
1185 if (ccid3_rx_hist == NULL)
1186 goto out;
1187
1188 ccid3_tx_hist = dccp_tx_hist_new("ccid3");
1189 if (ccid3_tx_hist == NULL)
1190 goto out_free_rx;
1191
1192 ccid3_li_hist = dccp_li_hist_new("ccid3");
1193 if (ccid3_li_hist == NULL)
1194 goto out_free_tx;
1195
1196 rc = ccid_register(&ccid3);
1197 if (rc != 0)
1198 goto out_free_loss_interval_history;
1199 out:
1200 return rc;
1201
1202 out_free_loss_interval_history:
1203 dccp_li_hist_delete(ccid3_li_hist);
1204 ccid3_li_hist = NULL;
1205 out_free_tx:
1206 dccp_tx_hist_delete(ccid3_tx_hist);
1207 ccid3_tx_hist = NULL;
1208 out_free_rx:
1209 dccp_rx_hist_delete(ccid3_rx_hist);
1210 ccid3_rx_hist = NULL;
1211 goto out;
1212 }
1213 module_init(ccid3_module_init);
1214
1215 static __exit void ccid3_module_exit(void)
1216 {
1217 ccid_unregister(&ccid3);
1218
1219 if (ccid3_tx_hist != NULL) {
1220 dccp_tx_hist_delete(ccid3_tx_hist);
1221 ccid3_tx_hist = NULL;
1222 }
1223 if (ccid3_rx_hist != NULL) {
1224 dccp_rx_hist_delete(ccid3_rx_hist);
1225 ccid3_rx_hist = NULL;
1226 }
1227 if (ccid3_li_hist != NULL) {
1228 dccp_li_hist_delete(ccid3_li_hist);
1229 ccid3_li_hist = NULL;
1230 }
1231 }
1232 module_exit(ccid3_module_exit);
1233
1234 MODULE_AUTHOR("Ian McDonald <iam4@cs.waikato.ac.nz>, "
1235 "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
1236 MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID");
1237 MODULE_LICENSE("GPL");
1238 MODULE_ALIAS("net-dccp-ccid-3");
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