?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[DCCP] ccid3: Consolidate handling of t_RTO
[hh.org.git] / net / dccp / ccids / ccid3.c
blobf0ed67c84a556672221ab73dfed52896fa0cce43
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
64
65 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
66 static int ccid3_debug;
67 #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a)
68 #else
69 #define ccid3_pr_debug(format, a...)
70 #endif
71
72 static struct dccp_tx_hist *ccid3_tx_hist;
73 static struct dccp_rx_hist *ccid3_rx_hist;
74 static struct dccp_li_hist *ccid3_li_hist;
75
76 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
77 static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state)
78 {
79 static char *ccid3_state_names[] = {
80 [TFRC_SSTATE_NO_SENT] = "NO_SENT",
81 [TFRC_SSTATE_NO_FBACK] = "NO_FBACK",
82 [TFRC_SSTATE_FBACK] = "FBACK",
83 [TFRC_SSTATE_TERM] = "TERM",
84 };
85
86 return ccid3_state_names[state];
87 }
88 #endif
89
90 static void ccid3_hc_tx_set_state(struct sock *sk,
91 enum ccid3_hc_tx_states state)
92 {
93 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
94 enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state;
95
96 ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
97 dccp_role(sk), sk, ccid3_tx_state_name(oldstate),
98 ccid3_tx_state_name(state));
99 WARN_ON(state == oldstate);
100 hctx->ccid3hctx_state = state;
101 }
102
103 /*
104 * Recalculate scheduled nominal send time t_nom, inter-packet interval
105 * t_ipi, and delta value. Should be called after each change to X.
106 */
107 static inline void ccid3_update_send_time(struct ccid3_hc_tx_sock *hctx)
108 {
109 timeval_sub_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi);
110
111 /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */
112 hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_x);
113
114 /* Update nominal send time with regard to the new t_ipi */
115 timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi);
116
117 /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */
118 hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2,
119 TFRC_OPSYS_HALF_TIME_GRAN);
120 }
121 /*
122 * Update X by
123 * If (p > 0)
124 * x_calc = calcX(s, R, p);
125 * X = max(min(X_calc, 2 * X_recv), s / t_mbi);
126 * Else
127 * If (now - tld >= R)
128 * X = max(min(2 * X, 2 * X_recv), s / R);
129 * tld = now;
130 */
131 static void ccid3_hc_tx_update_x(struct sock *sk)
132 {
133 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
134 const __u32 old_x = hctx->ccid3hctx_x;
135
136 /* To avoid large error in calcX */
137 if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) {
138 hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s,
139 hctx->ccid3hctx_rtt,
140 hctx->ccid3hctx_p);
141 hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc,
142 2 * hctx->ccid3hctx_x_recv),
143 (hctx->ccid3hctx_s /
144 TFRC_MAX_BACK_OFF_TIME));
145 } else {
146 struct timeval now;
147
148 dccp_timestamp(sk, &now);
149 if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >=
150 hctx->ccid3hctx_rtt) {
151 hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv,
152 hctx->ccid3hctx_x) * 2,
153 usecs_div(hctx->ccid3hctx_s,
154 hctx->ccid3hctx_rtt));
155 hctx->ccid3hctx_t_ld = now;
156 }
157 }
158 if (hctx->ccid3hctx_x != old_x)
159 ccid3_update_send_time(hctx);
160 }
161
162 static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
163 {
164 struct sock *sk = (struct sock *)data;
165 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
166 unsigned long next_tmout = USEC_PER_SEC / 5;
167
168 bh_lock_sock(sk);
169 if (sock_owned_by_user(sk)) {
170 /* Try again later. */
171 /* XXX: set some sensible MIB */
172 goto restart_timer;
173 }
174
175 ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk,
176 ccid3_tx_state_name(hctx->ccid3hctx_state));
177
178 switch (hctx->ccid3hctx_state) {
179 case TFRC_SSTATE_NO_FBACK:
180 /* Halve send rate */
181 hctx->ccid3hctx_x /= 2;
182 if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s /
183 TFRC_MAX_BACK_OFF_TIME))
184 hctx->ccid3hctx_x = (hctx->ccid3hctx_s /
185 TFRC_MAX_BACK_OFF_TIME);
186
187 ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d "
188 "bytes/s\n",
189 dccp_role(sk), sk,
190 ccid3_tx_state_name(hctx->ccid3hctx_state),
191 hctx->ccid3hctx_x);
192 /* The value of R is still undefined and so we can not recompute
193 * the timout value. Keep initial value as per [RFC 4342, 5]. */
194 next_tmout = TFRC_INITIAL_TIMEOUT;
195 ccid3_update_send_time(hctx);
196 break;
197 case TFRC_SSTATE_FBACK:
198 /*
199 * Check if IDLE since last timeout and recv rate is less than
200 * 4 packets per RTT
201 */
202 if (!hctx->ccid3hctx_idle ||
203 (hctx->ccid3hctx_x_recv >=
204 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) {
205 ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n",
206 dccp_role(sk), sk,
207 ccid3_tx_state_name(hctx->ccid3hctx_state));
208 /* Halve sending rate */
209
210 /* If (X_calc > 2 * X_recv)
211 * X_recv = max(X_recv / 2, s / (2 * t_mbi));
212 * Else
213 * X_recv = X_calc / 4;
214 */
215 BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P &&
216 hctx->ccid3hctx_x_calc == 0);
217
218 /* check also if p is zero -> x_calc is infinity? */
219 if (hctx->ccid3hctx_p < TFRC_SMALLEST_P ||
220 hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv)
221 hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2,
222 hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME));
223 else
224 hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4;
225
226 /* Update sending rate */
227 ccid3_hc_tx_update_x(sk);
228 }
229 /*
230 * Schedule no feedback timer to expire in
231 * max(4 * t_RTO, 2 * s/X) = max(4 * t_RTO, 2 * t_ipi)
232 * XXX This is non-standard, RFC 3448, 4.3 uses 4 * R
233 */
234 next_tmout = max(hctx->ccid3hctx_t_rto, 2*hctx->ccid3hctx_t_ipi);
235 break;
236 case TFRC_SSTATE_NO_SENT:
237 DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk);
238 /* fall through */
239 case TFRC_SSTATE_TERM:
240 goto out;
241 }
242
243 hctx->ccid3hctx_idle = 1;
244
245 restart_timer:
246 sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
247 jiffies + usecs_to_jiffies(next_tmout));
248 out:
249 bh_unlock_sock(sk);
250 sock_put(sk);
251 }
252
253 /*
254 * returns
255 * > 0: delay (in msecs) that should pass before actually sending
256 * = 0: can send immediately
257 * < 0: error condition; do not send packet
258 */
259 static int ccid3_hc_tx_send_packet(struct sock *sk,
260 struct sk_buff *skb, int len)
261 {
262 struct dccp_sock *dp = dccp_sk(sk);
263 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
264 struct dccp_tx_hist_entry *new_packet;
265 struct timeval now;
266 long delay;
267
268 BUG_ON(hctx == NULL);
269
270 /*
271 * This function is called only for Data and DataAck packets. Sending
272 * zero-sized Data(Ack)s is theoretically possible, but for congestion
273 * control this case is pathological - ignore it.
274 */
275 if (unlikely(len == 0))
276 return -EBADMSG;
277
278 /* See if last packet allocated was not sent */
279 new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
280 if (new_packet == NULL || new_packet->dccphtx_sent) {
281 new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist,
282 SLAB_ATOMIC);
283
284 if (unlikely(new_packet == NULL)) {
285 DCCP_WARN("%s, sk=%p, not enough mem to add to history,"
286 "send refused\n", dccp_role(sk), sk);
287 return -ENOBUFS;
288 }
289
290 dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet);
291 }
292
293 dccp_timestamp(sk, &now);
294
295 switch (hctx->ccid3hctx_state) {
296 case TFRC_SSTATE_NO_SENT:
297 sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
298 jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT));
299 hctx->ccid3hctx_last_win_count = 0;
300 hctx->ccid3hctx_t_last_win_count = now;
301 ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK);
302
303 /* First timeout, according to [RFC 3448, 4.2], is 1 second */
304 hctx->ccid3hctx_t_ipi = USEC_PER_SEC;
305 /* Initial delta: minimum of 0.5 sec and t_gran/2 */
306 hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN;
307
308 /* Set t_0 for initial packet */
309 hctx->ccid3hctx_t_nom = now;
310 break;
311 case TFRC_SSTATE_NO_FBACK:
312 case TFRC_SSTATE_FBACK:
313 delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now);
314 /*
315 * Scheduling of packet transmissions [RFC 3448, 4.6]
316 *
317 * if (t_now > t_nom - delta)
318 * // send the packet now
319 * else
320 * // send the packet in (t_nom - t_now) milliseconds.
321 */
322 if (delay >= hctx->ccid3hctx_delta)
323 return delay / 1000L;
324 break;
325 case TFRC_SSTATE_TERM:
326 DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk);
327 return -EINVAL;
328 }
329
330 /* prepare to send now (add options etc.) */
331 dp->dccps_hc_tx_insert_options = 1;
332 new_packet->dccphtx_ccval = DCCP_SKB_CB(skb)->dccpd_ccval =
333 hctx->ccid3hctx_last_win_count;
334 timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi);
335
336 return 0;
337 }
338
339 static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
340 {
341 const struct dccp_sock *dp = dccp_sk(sk);
342 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
343 struct timeval now;
344
345 BUG_ON(hctx == NULL);
346
347 dccp_timestamp(sk, &now);
348
349 /* check if we have sent a data packet */
350 if (len > 0) {
351 unsigned long quarter_rtt;
352 struct dccp_tx_hist_entry *packet;
353
354 packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
355 if (unlikely(packet == NULL)) {
356 DCCP_WARN("packet doesn't exist in history!\n");
357 return;
358 }
359 if (unlikely(packet->dccphtx_sent)) {
360 DCCP_WARN("no unsent packet in history!\n");
361 return;
362 }
363 packet->dccphtx_tstamp = now;
364 packet->dccphtx_seqno = dp->dccps_gss;
365 /*
366 * Check if win_count have changed
367 * Algorithm in "8.1. Window Counter Value" in RFC 4342.
368 */
369 quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count);
370 if (likely(hctx->ccid3hctx_rtt > 8))
371 quarter_rtt /= hctx->ccid3hctx_rtt / 4;
372
373 if (quarter_rtt > 0) {
374 hctx->ccid3hctx_t_last_win_count = now;
375 hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count +
376 min_t(unsigned long, quarter_rtt, 5)) % 16;
377 ccid3_pr_debug("%s, sk=%p, window changed from "
378 "%u to %u!\n",
379 dccp_role(sk), sk,
380 packet->dccphtx_ccval,
381 hctx->ccid3hctx_last_win_count);
382 }
383
384 hctx->ccid3hctx_idle = 0;
385 packet->dccphtx_rtt = hctx->ccid3hctx_rtt;
386 packet->dccphtx_sent = 1;
387 } else
388 ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n",
389 dccp_role(sk), sk, dp->dccps_gss);
390 }
391
392 static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
393 {
394 const struct dccp_sock *dp = dccp_sk(sk);
395 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
396 struct ccid3_options_received *opt_recv;
397 struct dccp_tx_hist_entry *packet;
398 struct timeval now;
399 unsigned long next_tmout;
400 u32 t_elapsed;
401 u32 pinv;
402 u32 x_recv;
403 u32 r_sample;
404
405 BUG_ON(hctx == NULL);
406
407 /* we are only interested in ACKs */
408 if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK ||
409 DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK))
410 return;
411
412 opt_recv = &hctx->ccid3hctx_options_received;
413
414 t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10;
415 x_recv = opt_recv->ccid3or_receive_rate;
416 pinv = opt_recv->ccid3or_loss_event_rate;
417
418 switch (hctx->ccid3hctx_state) {
419 case TFRC_SSTATE_NO_FBACK:
420 case TFRC_SSTATE_FBACK:
421 /* Calculate new round trip sample by
422 * R_sample = (now - t_recvdata) - t_delay */
423 /* get t_recvdata from history */
424 packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist,
425 DCCP_SKB_CB(skb)->dccpd_ack_seq);
426 if (unlikely(packet == NULL)) {
427 DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist "
428 "in history!\n", dccp_role(sk), sk,
429 (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq,
430 dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
431 return;
432 }
433
434 /* Update RTT */
435 dccp_timestamp(sk, &now);
436 r_sample = timeval_delta(&now, &packet->dccphtx_tstamp);
437 if (unlikely(r_sample <= t_elapsed))
438 DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n",
439 r_sample, t_elapsed);
440 else
441 r_sample -= t_elapsed;
442
443 /* Update RTT estimate by
444 * If (No feedback recv)
445 * R = R_sample;
446 * Else
447 * R = q * R + (1 - q) * R_sample;
448 *
449 * q is a constant, RFC 3448 recomments 0.9
450 */
451 if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) {
452 ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK);
453 hctx->ccid3hctx_rtt = r_sample;
454 } else
455 hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 +
456 r_sample / 10;
457
458 ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, "
459 "r_sample=%us\n", dccp_role(sk), sk,
460 hctx->ccid3hctx_rtt, r_sample);
461
462 /* Update receive rate */
463 hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */
464
465 /* Update loss event rate */
466 if (pinv == ~0 || pinv == 0)
467 hctx->ccid3hctx_p = 0;
468 else {
469 hctx->ccid3hctx_p = 1000000 / pinv;
470
471 if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) {
472 hctx->ccid3hctx_p = TFRC_SMALLEST_P;
473 ccid3_pr_debug("%s, sk=%p, Smallest p used!\n",
474 dccp_role(sk), sk);
475 }
476 }
477
478 /* unschedule no feedback timer */
479 sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
480
481 /* Update sending rate (and likely t_ipi, t_nom, and delta) */
482 ccid3_hc_tx_update_x(sk);
483
484 /* remove all packets older than the one acked from history */
485 dccp_tx_hist_purge_older(ccid3_tx_hist,
486 &hctx->ccid3hctx_hist, packet);
487 /*
488 * As we have calculated new ipi, delta, t_nom it is possible that
489 * we now can send a packet, so wake up dccp_wait_for_ccid
490 */
491 sk->sk_write_space(sk);
492
493
494 /* Update timeout interval. We use the alternative variant of
495 * [RFC 3448, 3.1] which sets the upper bound of t_rto to one
496 * second, as it is suggested for TCP (see RFC 2988, 2.4). */
497 hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt,
498 USEC_PER_SEC );
499 /*
500 * Schedule no feedback timer to expire in
501 * max(4 * t_RTO, 2 * s/X) = max(4 * t_RTO, 2 * t_ipi)
502 * XXX This is non-standard, RFC 3448, 4.3 uses 4 * R
503 */
504 next_tmout = max(hctx->ccid3hctx_t_rto, 2*hctx->ccid3hctx_t_ipi);
505
506 ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to "
507 "expire in %lu jiffies (%luus)\n",
508 dccp_role(sk), sk,
509 usecs_to_jiffies(next_tmout), next_tmout);
510
511 sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
512 jiffies + usecs_to_jiffies(next_tmout));
513
514 /* set idle flag */
515 hctx->ccid3hctx_idle = 1;
516 break;
517 case TFRC_SSTATE_NO_SENT:
518 DCCP_WARN("Illegal ACK received - no packet has been sent\n");
519 /* fall through */
520 case TFRC_SSTATE_TERM: /* ignore feedback when closing */
521 break;
522 }
523 }
524
525 static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb)
526 {
527 const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
528
529 BUG_ON(hctx == NULL);
530
531 if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)
532 DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count;
533 return 0;
534 }
535
536 static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
537 unsigned char len, u16 idx,
538 unsigned char *value)
539 {
540 int rc = 0;
541 const struct dccp_sock *dp = dccp_sk(sk);
542 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
543 struct ccid3_options_received *opt_recv;
544
545 BUG_ON(hctx == NULL);
546
547 opt_recv = &hctx->ccid3hctx_options_received;
548
549 if (opt_recv->ccid3or_seqno != dp->dccps_gsr) {
550 opt_recv->ccid3or_seqno = dp->dccps_gsr;
551 opt_recv->ccid3or_loss_event_rate = ~0;
552 opt_recv->ccid3or_loss_intervals_idx = 0;
553 opt_recv->ccid3or_loss_intervals_len = 0;
554 opt_recv->ccid3or_receive_rate = 0;
555 }
556
557 switch (option) {
558 case TFRC_OPT_LOSS_EVENT_RATE:
559 if (unlikely(len != 4)) {
560 DCCP_WARN("%s, sk=%p, invalid len %d "
561 "for TFRC_OPT_LOSS_EVENT_RATE\n",
562 dccp_role(sk), sk, len);
563 rc = -EINVAL;
564 } else {
565 opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value);
566 ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n",
567 dccp_role(sk), sk,
568 opt_recv->ccid3or_loss_event_rate);
569 }
570 break;
571 case TFRC_OPT_LOSS_INTERVALS:
572 opt_recv->ccid3or_loss_intervals_idx = idx;
573 opt_recv->ccid3or_loss_intervals_len = len;
574 ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n",
575 dccp_role(sk), sk,
576 opt_recv->ccid3or_loss_intervals_idx,
577 opt_recv->ccid3or_loss_intervals_len);
578 break;
579 case TFRC_OPT_RECEIVE_RATE:
580 if (unlikely(len != 4)) {
581 DCCP_WARN("%s, sk=%p, invalid len %d "
582 "for TFRC_OPT_RECEIVE_RATE\n",
583 dccp_role(sk), sk, len);
584 rc = -EINVAL;
585 } else {
586 opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value);
587 ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n",
588 dccp_role(sk), sk,
589 opt_recv->ccid3or_receive_rate);
590 }
591 break;
592 }
593
594 return rc;
595 }
596
597 static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk)
598 {
599 struct dccp_sock *dp = dccp_sk(sk);
600 struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid);
601
602 if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE &&
603 dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE)
604 hctx->ccid3hctx_s = dp->dccps_packet_size;
605 else
606 hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE;
607
608 /* Set transmission rate to 1 packet per second */
609 hctx->ccid3hctx_x = hctx->ccid3hctx_s;
610 hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT;
611 INIT_LIST_HEAD(&hctx->ccid3hctx_hist);
612
613 hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer;
614 hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk;
615 init_timer(&hctx->ccid3hctx_no_feedback_timer);
616
617 return 0;
618 }
619
620 static void ccid3_hc_tx_exit(struct sock *sk)
621 {
622 struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
623
624 BUG_ON(hctx == NULL);
625
626 ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM);
627 sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
628
629 /* Empty packet history */
630 dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist);
631 }
632
633 /*
634 * RX Half Connection methods
635 */
636
637 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
638 static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state)
639 {
640 static char *ccid3_rx_state_names[] = {
641 [TFRC_RSTATE_NO_DATA] = "NO_DATA",
642 [TFRC_RSTATE_DATA] = "DATA",
643 [TFRC_RSTATE_TERM] = "TERM",
644 };
645
646 return ccid3_rx_state_names[state];
647 }
648 #endif
649
650 static void ccid3_hc_rx_set_state(struct sock *sk,
651 enum ccid3_hc_rx_states state)
652 {
653 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
654 enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state;
655
656 ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
657 dccp_role(sk), sk, ccid3_rx_state_name(oldstate),
658 ccid3_rx_state_name(state));
659 WARN_ON(state == oldstate);
660 hcrx->ccid3hcrx_state = state;
661 }
662
663 static void ccid3_hc_rx_send_feedback(struct sock *sk)
664 {
665 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
666 struct dccp_sock *dp = dccp_sk(sk);
667 struct dccp_rx_hist_entry *packet;
668 struct timeval now;
669
670 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
671
672 dccp_timestamp(sk, &now);
673
674 switch (hcrx->ccid3hcrx_state) {
675 case TFRC_RSTATE_NO_DATA:
676 hcrx->ccid3hcrx_x_recv = 0;
677 break;
678 case TFRC_RSTATE_DATA: {
679 const u32 delta = timeval_delta(&now,
680 &hcrx->ccid3hcrx_tstamp_last_feedback);
681 hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv,
682 delta);
683 }
684 break;
685 case TFRC_RSTATE_TERM:
686 DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk);
687 return;
688 }
689
690 packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist);
691 if (unlikely(packet == NULL)) {
692 DCCP_WARN("%s, sk=%p, no data packet in history!\n",
693 dccp_role(sk), sk);
694 return;
695 }
696
697 hcrx->ccid3hcrx_tstamp_last_feedback = now;
698 hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval;
699 hcrx->ccid3hcrx_bytes_recv = 0;
700
701 /* Convert to multiples of 10us */
702 hcrx->ccid3hcrx_elapsed_time =
703 timeval_delta(&now, &packet->dccphrx_tstamp) / 10;
704 if (hcrx->ccid3hcrx_p == 0)
705 hcrx->ccid3hcrx_pinv = ~0;
706 else
707 hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p;
708 dp->dccps_hc_rx_insert_options = 1;
709 dccp_send_ack(sk);
710 }
711
712 static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
713 {
714 const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
715 __be32 x_recv, pinv;
716
717 BUG_ON(hcrx == NULL);
718
719 if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN))
720 return 0;
721
722 DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter;
723
724 if (dccp_packet_without_ack(skb))
725 return 0;
726
727 x_recv = htonl(hcrx->ccid3hcrx_x_recv);
728 pinv = htonl(hcrx->ccid3hcrx_pinv);
729
730 if ((hcrx->ccid3hcrx_elapsed_time != 0 &&
731 dccp_insert_option_elapsed_time(sk, skb,
732 hcrx->ccid3hcrx_elapsed_time)) ||
733 dccp_insert_option_timestamp(sk, skb) ||
734 dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE,
735 &pinv, sizeof(pinv)) ||
736 dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE,
737 &x_recv, sizeof(x_recv)))
738 return -1;
739
740 return 0;
741 }
742
743 /* calculate first loss interval
744 *
745 * returns estimated loss interval in usecs */
746
747 static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
748 {
749 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
750 struct dccp_rx_hist_entry *entry, *next, *tail = NULL;
751 u32 rtt, delta, x_recv, fval, p, tmp2;
752 struct timeval tstamp = { 0, };
753 int interval = 0;
754 int win_count = 0;
755 int step = 0;
756 u64 tmp1;
757
758 list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist,
759 dccphrx_node) {
760 if (dccp_rx_hist_entry_data_packet(entry)) {
761 tail = entry;
762
763 switch (step) {
764 case 0:
765 tstamp = entry->dccphrx_tstamp;
766 win_count = entry->dccphrx_ccval;
767 step = 1;
768 break;
769 case 1:
770 interval = win_count - entry->dccphrx_ccval;
771 if (interval < 0)
772 interval += TFRC_WIN_COUNT_LIMIT;
773 if (interval > 4)
774 goto found;
775 break;
776 }
777 }
778 }
779
780 if (unlikely(step == 0)) {
781 DCCP_WARN("%s, sk=%p, packet history has no data packets!\n",
782 dccp_role(sk), sk);
783 return ~0;
784 }
785
786 if (unlikely(interval == 0)) {
787 DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0."
788 "Defaulting to 1\n", dccp_role(sk), sk);
789 interval = 1;
790 }
791 found:
792 if (!tail) {
793 DCCP_CRIT("tail is null\n");
794 return ~0;
795 }
796 rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval;
797 ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n",
798 dccp_role(sk), sk, rtt);
799
800 if (rtt == 0) {
801 DCCP_WARN("RTT==0, setting to 1\n");
802 rtt = 1;
803 }
804
805 dccp_timestamp(sk, &tstamp);
806 delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback);
807 x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta);
808
809 if (x_recv == 0)
810 x_recv = hcrx->ccid3hcrx_x_recv;
811
812 tmp1 = (u64)x_recv * (u64)rtt;
813 do_div(tmp1,10000000);
814 tmp2 = (u32)tmp1;
815
816 if (!tmp2) {
817 DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv, rtt);
818 return ~0;
819 }
820
821 fval = (hcrx->ccid3hcrx_s * 100000) / tmp2;
822 /* do not alter order above or you will get overflow on 32 bit */
823 p = tfrc_calc_x_reverse_lookup(fval);
824 ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied "
825 "loss rate=%u\n", dccp_role(sk), sk, x_recv, p);
826
827 if (p == 0)
828 return ~0;
829 else
830 return 1000000 / p;
831 }
832
833 static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss)
834 {
835 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
836 struct dccp_li_hist_entry *head;
837 u64 seq_temp;
838
839 if (list_empty(&hcrx->ccid3hcrx_li_hist)) {
840 if (!dccp_li_hist_interval_new(ccid3_li_hist,
841 &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss))
842 return;
843
844 head = list_entry(hcrx->ccid3hcrx_li_hist.next,
845 struct dccp_li_hist_entry, dccplih_node);
846 head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk);
847 } else {
848 struct dccp_li_hist_entry *entry;
849 struct list_head *tail;
850
851 head = list_entry(hcrx->ccid3hcrx_li_hist.next,
852 struct dccp_li_hist_entry, dccplih_node);
853 /* FIXME win count check removed as was wrong */
854 /* should make this check with receive history */
855 /* and compare there as per section 10.2 of RFC4342 */
856
857 /* new loss event detected */
858 /* calculate last interval length */
859 seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss);
860 entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC);
861
862 if (entry == NULL) {
863 DCCP_BUG("out of memory - can not allocate entry");
864 return;
865 }
866
867 list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist);
868
869 tail = hcrx->ccid3hcrx_li_hist.prev;
870 list_del(tail);
871 kmem_cache_free(ccid3_li_hist->dccplih_slab, tail);
872
873 /* Create the newest interval */
874 entry->dccplih_seqno = seq_loss;
875 entry->dccplih_interval = seq_temp;
876 entry->dccplih_win_count = win_loss;
877 }
878 }
879
880 static int ccid3_hc_rx_detect_loss(struct sock *sk,
881 struct dccp_rx_hist_entry *packet)
882 {
883 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
884 struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist);
885 u64 seqno = packet->dccphrx_seqno;
886 u64 tmp_seqno;
887 int loss = 0;
888 u8 ccval;
889
890
891 tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss;
892
893 if (!rx_hist ||
894 follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) {
895 hcrx->ccid3hcrx_seqno_nonloss = seqno;
896 hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval;
897 goto detect_out;
898 }
899
900
901 while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno)
902 > TFRC_RECV_NUM_LATE_LOSS) {
903 loss = 1;
904 ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss,
905 hcrx->ccid3hcrx_ccval_nonloss);
906 tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss;
907 dccp_inc_seqno(&tmp_seqno);
908 hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno;
909 dccp_inc_seqno(&tmp_seqno);
910 while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist,
911 tmp_seqno, &ccval)) {
912 hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno;
913 hcrx->ccid3hcrx_ccval_nonloss = ccval;
914 dccp_inc_seqno(&tmp_seqno);
915 }
916 }
917
918 /* FIXME - this code could be simplified with above while */
919 /* but works at moment */
920 if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) {
921 hcrx->ccid3hcrx_seqno_nonloss = seqno;
922 hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval;
923 }
924
925 detect_out:
926 dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist,
927 &hcrx->ccid3hcrx_li_hist, packet,
928 hcrx->ccid3hcrx_seqno_nonloss);
929 return loss;
930 }
931
932 static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
933 {
934 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
935 const struct dccp_options_received *opt_recv;
936 struct dccp_rx_hist_entry *packet;
937 struct timeval now;
938 u32 p_prev, rtt_prev, r_sample, t_elapsed;
939 int loss;
940
941 BUG_ON(hcrx == NULL);
942
943 opt_recv = &dccp_sk(sk)->dccps_options_received;
944
945 switch (DCCP_SKB_CB(skb)->dccpd_type) {
946 case DCCP_PKT_ACK:
947 if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
948 return;
949 case DCCP_PKT_DATAACK:
950 if (opt_recv->dccpor_timestamp_echo == 0)
951 break;
952 rtt_prev = hcrx->ccid3hcrx_rtt;
953 dccp_timestamp(sk, &now);
954 timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10);
955 r_sample = timeval_usecs(&now);
956 t_elapsed = opt_recv->dccpor_elapsed_time * 10;
957
958 if (unlikely(r_sample <= t_elapsed))
959 DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n",
960 r_sample, t_elapsed);
961 else
962 r_sample -= t_elapsed;
963
964 if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
965 hcrx->ccid3hcrx_rtt = r_sample;
966 else
967 hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 +
968 r_sample / 10;
969
970 if (rtt_prev != hcrx->ccid3hcrx_rtt)
971 ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n",
972 dccp_role(sk), hcrx->ccid3hcrx_rtt,
973 opt_recv->dccpor_elapsed_time);
974 break;
975 case DCCP_PKT_DATA:
976 break;
977 default: /* We're not interested in other packet types, move along */
978 return;
979 }
980
981 packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp,
982 skb, SLAB_ATOMIC);
983 if (unlikely(packet == NULL)) {
984 DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet "
985 "to history, consider it lost!\n", dccp_role(sk), sk);
986 return;
987 }
988
989 loss = ccid3_hc_rx_detect_loss(sk, packet);
990
991 if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK)
992 return;
993
994 switch (hcrx->ccid3hcrx_state) {
995 case TFRC_RSTATE_NO_DATA:
996 ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial "
997 "feedback\n",
998 dccp_role(sk), sk,
999 dccp_state_name(sk->sk_state), skb);
1000 ccid3_hc_rx_send_feedback(sk);
1001 ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA);
1002 return;
1003 case TFRC_RSTATE_DATA:
1004 hcrx->ccid3hcrx_bytes_recv += skb->len -
1005 dccp_hdr(skb)->dccph_doff * 4;
1006 if (loss)
1007 break;
1008
1009 dccp_timestamp(sk, &now);
1010 if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >=
1011 hcrx->ccid3hcrx_rtt) {
1012 hcrx->ccid3hcrx_tstamp_last_ack = now;
1013 ccid3_hc_rx_send_feedback(sk);
1014 }
1015 return;
1016 case TFRC_RSTATE_TERM:
1017 DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk);
1018 return;
1019 }
1020
1021 /* Dealing with packet loss */
1022 ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n",
1023 dccp_role(sk), sk, dccp_state_name(sk->sk_state));
1024
1025 p_prev = hcrx->ccid3hcrx_p;
1026
1027 /* Calculate loss event rate */
1028 if (!list_empty(&hcrx->ccid3hcrx_li_hist)) {
1029 u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist);
1030
1031 /* Scaling up by 1000000 as fixed decimal */
1032 if (i_mean != 0)
1033 hcrx->ccid3hcrx_p = 1000000 / i_mean;
1034 } else
1035 DCCP_BUG("empty loss history");
1036
1037 if (hcrx->ccid3hcrx_p > p_prev) {
1038 ccid3_hc_rx_send_feedback(sk);
1039 return;
1040 }
1041 }
1042
1043 static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk)
1044 {
1045 struct dccp_sock *dp = dccp_sk(sk);
1046 struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid);
1047
1048 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
1049
1050 if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE &&
1051 dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE)
1052 hcrx->ccid3hcrx_s = dp->dccps_packet_size;
1053 else
1054 hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE;
1055
1056 hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA;
1057 INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist);
1058 INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist);
1059 dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack);
1060 hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack;
1061 hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */
1062 return 0;
1063 }
1064
1065 static void ccid3_hc_rx_exit(struct sock *sk)
1066 {
1067 struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
1068
1069 BUG_ON(hcrx == NULL);
1070
1071 ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM);
1072
1073 /* Empty packet history */
1074 dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist);
1075
1076 /* Empty loss interval history */
1077 dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist);
1078 }
1079
1080 static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info)
1081 {
1082 const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
1083
1084 /* Listen socks doesn't have a private CCID block */
1085 if (sk->sk_state == DCCP_LISTEN)
1086 return;
1087
1088 BUG_ON(hcrx == NULL);
1089
1090 info->tcpi_ca_state = hcrx->ccid3hcrx_state;
1091 info->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1092 info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt;
1093 }
1094
1095 static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info)
1096 {
1097 const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
1098
1099 /* Listen socks doesn't have a private CCID block */
1100 if (sk->sk_state == DCCP_LISTEN)
1101 return;
1102
1103 BUG_ON(hctx == NULL);
1104
1105 info->tcpi_rto = hctx->ccid3hctx_t_rto;
1106 info->tcpi_rtt = hctx->ccid3hctx_rtt;
1107 }
1108
1109 static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
1110 u32 __user *optval, int __user *optlen)
1111 {
1112 const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
1113 const void *val;
1114
1115 /* Listen socks doesn't have a private CCID block */
1116 if (sk->sk_state == DCCP_LISTEN)
1117 return -EINVAL;
1118
1119 switch (optname) {
1120 case DCCP_SOCKOPT_CCID_RX_INFO:
1121 if (len < sizeof(hcrx->ccid3hcrx_tfrc))
1122 return -EINVAL;
1123 len = sizeof(hcrx->ccid3hcrx_tfrc);
1124 val = &hcrx->ccid3hcrx_tfrc;
1125 break;
1126 default:
1127 return -ENOPROTOOPT;
1128 }
1129
1130 if (put_user(len, optlen) || copy_to_user(optval, val, len))
1131 return -EFAULT;
1132
1133 return 0;
1134 }
1135
1136 static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len,
1137 u32 __user *optval, int __user *optlen)
1138 {
1139 const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
1140 const void *val;
1141
1142 /* Listen socks doesn't have a private CCID block */
1143 if (sk->sk_state == DCCP_LISTEN)
1144 return -EINVAL;
1145
1146 switch (optname) {
1147 case DCCP_SOCKOPT_CCID_TX_INFO:
1148 if (len < sizeof(hctx->ccid3hctx_tfrc))
1149 return -EINVAL;
1150 len = sizeof(hctx->ccid3hctx_tfrc);
1151 val = &hctx->ccid3hctx_tfrc;
1152 break;
1153 default:
1154 return -ENOPROTOOPT;
1155 }
1156
1157 if (put_user(len, optlen) || copy_to_user(optval, val, len))
1158 return -EFAULT;
1159
1160 return 0;
1161 }
1162
1163 static struct ccid_operations ccid3 = {
1164 .ccid_id = DCCPC_CCID3,
1165 .ccid_name = "ccid3",
1166 .ccid_owner = THIS_MODULE,
1167 .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock),
1168 .ccid_hc_tx_init = ccid3_hc_tx_init,
1169 .ccid_hc_tx_exit = ccid3_hc_tx_exit,
1170 .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet,
1171 .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent,
1172 .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv,
1173 .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options,
1174 .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options,
1175 .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock),
1176 .ccid_hc_rx_init = ccid3_hc_rx_init,
1177 .ccid_hc_rx_exit = ccid3_hc_rx_exit,
1178 .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options,
1179 .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv,
1180 .ccid_hc_rx_get_info = ccid3_hc_rx_get_info,
1181 .ccid_hc_tx_get_info = ccid3_hc_tx_get_info,
1182 .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt,
1183 .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt,
1184 };
1185
1186 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
1187 module_param(ccid3_debug, int, 0444);
1188 MODULE_PARM_DESC(ccid3_debug, "Enable debug messages");
1189 #endif
1190
1191 static __init int ccid3_module_init(void)
1192 {
1193 int rc = -ENOBUFS;
1194
1195 ccid3_rx_hist = dccp_rx_hist_new("ccid3");
1196 if (ccid3_rx_hist == NULL)
1197 goto out;
1198
1199 ccid3_tx_hist = dccp_tx_hist_new("ccid3");
1200 if (ccid3_tx_hist == NULL)
1201 goto out_free_rx;
1202
1203 ccid3_li_hist = dccp_li_hist_new("ccid3");
1204 if (ccid3_li_hist == NULL)
1205 goto out_free_tx;
1206
1207 rc = ccid_register(&ccid3);
1208 if (rc != 0)
1209 goto out_free_loss_interval_history;
1210 out:
1211 return rc;
1212
1213 out_free_loss_interval_history:
1214 dccp_li_hist_delete(ccid3_li_hist);
1215 ccid3_li_hist = NULL;
1216 out_free_tx:
1217 dccp_tx_hist_delete(ccid3_tx_hist);
1218 ccid3_tx_hist = NULL;
1219 out_free_rx:
1220 dccp_rx_hist_delete(ccid3_rx_hist);
1221 ccid3_rx_hist = NULL;
1222 goto out;
1223 }
1224 module_init(ccid3_module_init);
1225
1226 static __exit void ccid3_module_exit(void)
1227 {
1228 ccid_unregister(&ccid3);
1229
1230 if (ccid3_tx_hist != NULL) {
1231 dccp_tx_hist_delete(ccid3_tx_hist);
1232 ccid3_tx_hist = NULL;
1233 }
1234 if (ccid3_rx_hist != NULL) {
1235 dccp_rx_hist_delete(ccid3_rx_hist);
1236 ccid3_rx_hist = NULL;
1237 }
1238 if (ccid3_li_hist != NULL) {
1239 dccp_li_hist_delete(ccid3_li_hist);
1240 ccid3_li_hist = NULL;
1241 }
1242 }
1243 module_exit(ccid3_module_exit);
1244
1245 MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, "
1246 "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
1247 MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID");
1248 MODULE_LICENSE("GPL");
1249 MODULE_ALIAS("net-dccp-ccid-3");
hh.org GIT migration