2 * net/dccp/ccids/ccid3.c
4 * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
5 * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
7 * An implementation of the DCCP protocol
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/
12 * This code also uses code from Lulea University, rereleased as GPL by its
14 * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
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>.
20 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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.
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.
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.
39 #include "lib/packet_history.h"
40 #include "lib/loss_interval.h"
45 * Reason for maths here is to avoid 32 bit overflow when a is big.
46 * With this we get close to the limit.
48 static u32
usecs_div(const u32 a
, const u32 b
)
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 :
59 const u32 tmp
= a
* (USEC_PER_SEC
/ div
);
60 return (b
>= 2 * div
) ? tmp
/ (b
/ div
) : tmp
;
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)
69 #define ccid3_pr_debug(format, a...)
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
;
76 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
77 static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state
)
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",
86 return ccid3_state_names
[state
];
90 static void ccid3_hc_tx_set_state(struct sock
*sk
,
91 enum ccid3_hc_tx_states state
)
93 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
94 enum ccid3_hc_tx_states oldstate
= hctx
->ccid3hctx_state
;
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
;
103 /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */
104 static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock
*hctx
)
106 hctx
->ccid3hctx_t_ipi
= usecs_div(hctx
->ccid3hctx_s
, hctx
->ccid3hctx_x
);
109 /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */
110 static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock
*hctx
)
112 hctx
->ccid3hctx_delta
= min_t(u32
, hctx
->ccid3hctx_t_ipi
/ 2,
113 TFRC_OPSYS_HALF_TIME_GRAN
);
119 * x_calc = calcX(s, R, p);
120 * X = max(min(X_calc, 2 * X_recv), s / t_mbi);
122 * If (now - tld >= R)
123 * X = max(min(2 * X, 2 * X_recv), s / R);
126 static void ccid3_hc_tx_update_x(struct sock
*sk
)
128 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
130 /* To avoid large error in calcX */
131 if (hctx
->ccid3hctx_p
>= TFRC_SMALLEST_P
) {
132 hctx
->ccid3hctx_x_calc
= tfrc_calc_x(hctx
->ccid3hctx_s
,
135 hctx
->ccid3hctx_x
= max_t(u32
, min_t(u32
, hctx
->ccid3hctx_x_calc
,
136 2 * hctx
->ccid3hctx_x_recv
),
138 TFRC_MAX_BACK_OFF_TIME
));
142 dccp_timestamp(sk
, &now
);
143 if (timeval_delta(&now
, &hctx
->ccid3hctx_t_ld
) >=
144 hctx
->ccid3hctx_rtt
) {
145 hctx
->ccid3hctx_x
= max_t(u32
, min_t(u32
, hctx
->ccid3hctx_x_recv
,
146 hctx
->ccid3hctx_x
) * 2,
147 usecs_div(hctx
->ccid3hctx_s
,
148 hctx
->ccid3hctx_rtt
));
149 hctx
->ccid3hctx_t_ld
= now
;
154 static void ccid3_hc_tx_no_feedback_timer(unsigned long data
)
156 struct sock
*sk
= (struct sock
*)data
;
157 unsigned long next_tmout
= 0;
158 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
161 if (sock_owned_by_user(sk
)) {
162 /* Try again later. */
163 /* XXX: set some sensible MIB */
164 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
169 ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk
), sk
,
170 ccid3_tx_state_name(hctx
->ccid3hctx_state
));
172 switch (hctx
->ccid3hctx_state
) {
173 case TFRC_SSTATE_NO_FBACK
:
174 /* Halve send rate */
175 hctx
->ccid3hctx_x
/= 2;
176 if (hctx
->ccid3hctx_x
< (hctx
->ccid3hctx_s
/
177 TFRC_MAX_BACK_OFF_TIME
))
178 hctx
->ccid3hctx_x
= (hctx
->ccid3hctx_s
/
179 TFRC_MAX_BACK_OFF_TIME
);
181 ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d "
184 ccid3_tx_state_name(hctx
->ccid3hctx_state
),
186 next_tmout
= max_t(u32
, 2 * usecs_div(hctx
->ccid3hctx_s
,
188 TFRC_INITIAL_TIMEOUT
);
190 * FIXME - not sure above calculation is correct. See section
191 * 5 of CCID3 11 should adjust tx_t_ipi and double that to
195 case TFRC_SSTATE_FBACK
:
197 * Check if IDLE since last timeout and recv rate is less than
200 if (!hctx
->ccid3hctx_idle
||
201 (hctx
->ccid3hctx_x_recv
>=
202 4 * usecs_div(hctx
->ccid3hctx_s
, hctx
->ccid3hctx_rtt
))) {
203 ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n",
205 ccid3_tx_state_name(hctx
->ccid3hctx_state
));
206 /* Halve sending rate */
208 /* If (X_calc > 2 * X_recv)
209 * X_recv = max(X_recv / 2, s / (2 * t_mbi));
211 * X_recv = X_calc / 4;
213 BUG_ON(hctx
->ccid3hctx_p
>= TFRC_SMALLEST_P
&&
214 hctx
->ccid3hctx_x_calc
== 0);
216 /* check also if p is zero -> x_calc is infinity? */
217 if (hctx
->ccid3hctx_p
< TFRC_SMALLEST_P
||
218 hctx
->ccid3hctx_x_calc
> 2 * hctx
->ccid3hctx_x_recv
)
219 hctx
->ccid3hctx_x_recv
= max_t(u32
, hctx
->ccid3hctx_x_recv
/ 2,
220 hctx
->ccid3hctx_s
/ (2 * TFRC_MAX_BACK_OFF_TIME
));
222 hctx
->ccid3hctx_x_recv
= hctx
->ccid3hctx_x_calc
/ 4;
224 /* Update sending rate */
225 ccid3_hc_tx_update_x(sk
);
228 * Schedule no feedback timer to expire in
229 * max(4 * R, 2 * s / X)
231 next_tmout
= max_t(u32
, hctx
->ccid3hctx_t_rto
,
232 2 * usecs_div(hctx
->ccid3hctx_s
,
235 case TFRC_SSTATE_NO_SENT
:
236 DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk
), sk
);
238 case TFRC_SSTATE_TERM
:
242 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
243 jiffies
+ max_t(u32
, 1, usecs_to_jiffies(next_tmout
)));
244 hctx
->ccid3hctx_idle
= 1;
252 * > 0: delay (in msecs) that should pass before actually sending
253 * = 0: can send immediately
254 * < 0: error condition; do not send packet
256 static int ccid3_hc_tx_send_packet(struct sock
*sk
,
257 struct sk_buff
*skb
, int len
)
259 struct dccp_sock
*dp
= dccp_sk(sk
);
260 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
261 struct dccp_tx_hist_entry
*new_packet
;
265 BUG_ON(hctx
== NULL
);
268 * This function is called only for Data and DataAck packets. Sending
269 * zero-sized Data(Ack)s is theoretically possible, but for congestion
270 * control this case is pathological - ignore it.
272 if (unlikely(len
== 0))
275 /* See if last packet allocated was not sent */
276 new_packet
= dccp_tx_hist_head(&hctx
->ccid3hctx_hist
);
277 if (new_packet
== NULL
|| new_packet
->dccphtx_sent
) {
278 new_packet
= dccp_tx_hist_entry_new(ccid3_tx_hist
,
281 if (unlikely(new_packet
== NULL
)) {
282 DCCP_WARN("%s, sk=%p, not enough mem to add to history,"
283 "send refused\n", dccp_role(sk
), sk
);
287 dccp_tx_hist_add_entry(&hctx
->ccid3hctx_hist
, new_packet
);
290 dccp_timestamp(sk
, &now
);
292 switch (hctx
->ccid3hctx_state
) {
293 case TFRC_SSTATE_NO_SENT
:
294 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
295 jiffies
+ usecs_to_jiffies(TFRC_INITIAL_TIMEOUT
));
296 hctx
->ccid3hctx_last_win_count
= 0;
297 hctx
->ccid3hctx_t_last_win_count
= now
;
298 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_NO_FBACK
);
300 /* First timeout, according to [RFC 3448, 4.2], is 1 second */
301 hctx
->ccid3hctx_t_ipi
= USEC_PER_SEC
;
302 /* Initial delta: minimum of 0.5 sec and t_gran/2 */
303 hctx
->ccid3hctx_delta
= TFRC_OPSYS_HALF_TIME_GRAN
;
305 /* Set t_0 for initial packet */
306 hctx
->ccid3hctx_t_nom
= now
;
308 case TFRC_SSTATE_NO_FBACK
:
309 case TFRC_SSTATE_FBACK
:
310 delay
= timeval_delta(&hctx
->ccid3hctx_t_nom
, &now
);
312 * Scheduling of packet transmissions [RFC 3448, 4.6]
314 * if (t_now > t_nom - delta)
315 * // send the packet now
317 * // send the packet in (t_nom - t_now) milliseconds.
319 if (delay
>= hctx
->ccid3hctx_delta
)
320 return delay
/ 1000L;
322 case TFRC_SSTATE_TERM
:
323 DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk
), sk
);
327 /* prepare to send now (add options etc.) */
328 dp
->dccps_hc_tx_insert_options
= 1;
329 new_packet
->dccphtx_ccval
= DCCP_SKB_CB(skb
)->dccpd_ccval
=
330 hctx
->ccid3hctx_last_win_count
;
331 timeval_add_usecs(&hctx
->ccid3hctx_t_nom
, hctx
->ccid3hctx_t_ipi
);
336 static void ccid3_hc_tx_packet_sent(struct sock
*sk
, int more
, int len
)
338 const struct dccp_sock
*dp
= dccp_sk(sk
);
339 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
342 BUG_ON(hctx
== NULL
);
344 dccp_timestamp(sk
, &now
);
346 /* check if we have sent a data packet */
348 unsigned long quarter_rtt
;
349 struct dccp_tx_hist_entry
*packet
;
351 packet
= dccp_tx_hist_head(&hctx
->ccid3hctx_hist
);
352 if (unlikely(packet
== NULL
)) {
353 DCCP_WARN("packet doesn't exist in history!\n");
356 if (unlikely(packet
->dccphtx_sent
)) {
357 DCCP_WARN("no unsent packet in history!\n");
360 packet
->dccphtx_tstamp
= now
;
361 packet
->dccphtx_seqno
= dp
->dccps_gss
;
363 * Check if win_count have changed
364 * Algorithm in "8.1. Window Counter Value" in RFC 4342.
366 quarter_rtt
= timeval_delta(&now
, &hctx
->ccid3hctx_t_last_win_count
);
367 if (likely(hctx
->ccid3hctx_rtt
> 8))
368 quarter_rtt
/= hctx
->ccid3hctx_rtt
/ 4;
370 if (quarter_rtt
> 0) {
371 hctx
->ccid3hctx_t_last_win_count
= now
;
372 hctx
->ccid3hctx_last_win_count
= (hctx
->ccid3hctx_last_win_count
+
373 min_t(unsigned long, quarter_rtt
, 5)) % 16;
374 ccid3_pr_debug("%s, sk=%p, window changed from "
377 packet
->dccphtx_ccval
,
378 hctx
->ccid3hctx_last_win_count
);
381 hctx
->ccid3hctx_idle
= 0;
382 packet
->dccphtx_rtt
= hctx
->ccid3hctx_rtt
;
383 packet
->dccphtx_sent
= 1;
385 ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n",
386 dccp_role(sk
), sk
, dp
->dccps_gss
);
389 static void ccid3_hc_tx_packet_recv(struct sock
*sk
, struct sk_buff
*skb
)
391 const struct dccp_sock
*dp
= dccp_sk(sk
);
392 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
393 struct ccid3_options_received
*opt_recv
;
394 struct dccp_tx_hist_entry
*packet
;
396 unsigned long next_tmout
;
402 BUG_ON(hctx
== NULL
);
404 /* we are only interested in ACKs */
405 if (!(DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_ACK
||
406 DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_DATAACK
))
409 opt_recv
= &hctx
->ccid3hctx_options_received
;
411 t_elapsed
= dp
->dccps_options_received
.dccpor_elapsed_time
* 10;
412 x_recv
= opt_recv
->ccid3or_receive_rate
;
413 pinv
= opt_recv
->ccid3or_loss_event_rate
;
415 switch (hctx
->ccid3hctx_state
) {
416 case TFRC_SSTATE_NO_FBACK
:
417 case TFRC_SSTATE_FBACK
:
418 /* Calculate new round trip sample by
419 * R_sample = (now - t_recvdata) - t_delay */
420 /* get t_recvdata from history */
421 packet
= dccp_tx_hist_find_entry(&hctx
->ccid3hctx_hist
,
422 DCCP_SKB_CB(skb
)->dccpd_ack_seq
);
423 if (unlikely(packet
== NULL
)) {
424 DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist "
425 "in history!\n", dccp_role(sk
), sk
,
426 (unsigned long long)DCCP_SKB_CB(skb
)->dccpd_ack_seq
,
427 dccp_packet_name(DCCP_SKB_CB(skb
)->dccpd_type
));
432 dccp_timestamp(sk
, &now
);
433 r_sample
= timeval_delta(&now
, &packet
->dccphtx_tstamp
);
434 if (unlikely(r_sample
<= t_elapsed
))
435 DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n",
436 r_sample
, t_elapsed
);
438 r_sample
-= t_elapsed
;
440 /* Update RTT estimate by
441 * If (No feedback recv)
444 * R = q * R + (1 - q) * R_sample;
446 * q is a constant, RFC 3448 recomments 0.9
448 if (hctx
->ccid3hctx_state
== TFRC_SSTATE_NO_FBACK
) {
449 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_FBACK
);
450 hctx
->ccid3hctx_rtt
= r_sample
;
452 hctx
->ccid3hctx_rtt
= (hctx
->ccid3hctx_rtt
* 9) / 10 +
455 ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, "
456 "r_sample=%us\n", dccp_role(sk
), sk
,
457 hctx
->ccid3hctx_rtt
, r_sample
);
459 /* Update timeout interval */
460 hctx
->ccid3hctx_t_rto
= max_t(u32
, 4 * hctx
->ccid3hctx_rtt
,
463 /* Update receive rate */
464 hctx
->ccid3hctx_x_recv
= x_recv
;/* X_recv in bytes per sec */
466 /* Update loss event rate */
467 if (pinv
== ~0 || pinv
== 0)
468 hctx
->ccid3hctx_p
= 0;
470 hctx
->ccid3hctx_p
= 1000000 / pinv
;
472 if (hctx
->ccid3hctx_p
< TFRC_SMALLEST_P
) {
473 hctx
->ccid3hctx_p
= TFRC_SMALLEST_P
;
474 ccid3_pr_debug("%s, sk=%p, Smallest p used!\n",
479 /* unschedule no feedback timer */
480 sk_stop_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
);
482 /* Update sending rate */
483 ccid3_hc_tx_update_x(sk
);
485 /* Update next send time */
486 timeval_sub_usecs(&hctx
->ccid3hctx_t_nom
,
487 hctx
->ccid3hctx_t_ipi
);
488 ccid3_calc_new_t_ipi(hctx
);
489 timeval_add_usecs(&hctx
->ccid3hctx_t_nom
,
490 hctx
->ccid3hctx_t_ipi
);
491 ccid3_calc_new_delta(hctx
);
493 /* remove all packets older than the one acked from history */
494 dccp_tx_hist_purge_older(ccid3_tx_hist
,
495 &hctx
->ccid3hctx_hist
, packet
);
497 * As we have calculated new ipi, delta, t_nom it is possible that
498 * we now can send a packet, so wake up dccp_wait_for_ccids.
500 sk
->sk_write_space(sk
);
503 * Schedule no feedback timer to expire in
504 * max(4 * R, 2 * s / X)
506 next_tmout
= max(hctx
->ccid3hctx_t_rto
,
507 2 * usecs_div(hctx
->ccid3hctx_s
,
510 ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to "
511 "expire in %lu jiffies (%luus)\n",
513 usecs_to_jiffies(next_tmout
), next_tmout
);
515 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
516 jiffies
+ max_t(u32
, 1, usecs_to_jiffies(next_tmout
)));
519 hctx
->ccid3hctx_idle
= 1;
521 case TFRC_SSTATE_NO_SENT
:
522 DCCP_WARN("Illegal ACK received - no packet has been sent\n");
524 case TFRC_SSTATE_TERM
: /* ignore feedback when closing */
529 static int ccid3_hc_tx_insert_options(struct sock
*sk
, struct sk_buff
*skb
)
531 const struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
533 BUG_ON(hctx
== NULL
);
535 if (sk
->sk_state
== DCCP_OPEN
|| sk
->sk_state
== DCCP_PARTOPEN
)
536 DCCP_SKB_CB(skb
)->dccpd_ccval
= hctx
->ccid3hctx_last_win_count
;
540 static int ccid3_hc_tx_parse_options(struct sock
*sk
, unsigned char option
,
541 unsigned char len
, u16 idx
,
542 unsigned char *value
)
545 const struct dccp_sock
*dp
= dccp_sk(sk
);
546 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
547 struct ccid3_options_received
*opt_recv
;
549 BUG_ON(hctx
== NULL
);
551 opt_recv
= &hctx
->ccid3hctx_options_received
;
553 if (opt_recv
->ccid3or_seqno
!= dp
->dccps_gsr
) {
554 opt_recv
->ccid3or_seqno
= dp
->dccps_gsr
;
555 opt_recv
->ccid3or_loss_event_rate
= ~0;
556 opt_recv
->ccid3or_loss_intervals_idx
= 0;
557 opt_recv
->ccid3or_loss_intervals_len
= 0;
558 opt_recv
->ccid3or_receive_rate
= 0;
562 case TFRC_OPT_LOSS_EVENT_RATE
:
563 if (unlikely(len
!= 4)) {
564 DCCP_WARN("%s, sk=%p, invalid len %d "
565 "for TFRC_OPT_LOSS_EVENT_RATE\n",
566 dccp_role(sk
), sk
, len
);
569 opt_recv
->ccid3or_loss_event_rate
= ntohl(*(__be32
*)value
);
570 ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n",
572 opt_recv
->ccid3or_loss_event_rate
);
575 case TFRC_OPT_LOSS_INTERVALS
:
576 opt_recv
->ccid3or_loss_intervals_idx
= idx
;
577 opt_recv
->ccid3or_loss_intervals_len
= len
;
578 ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n",
580 opt_recv
->ccid3or_loss_intervals_idx
,
581 opt_recv
->ccid3or_loss_intervals_len
);
583 case TFRC_OPT_RECEIVE_RATE
:
584 if (unlikely(len
!= 4)) {
585 DCCP_WARN("%s, sk=%p, invalid len %d "
586 "for TFRC_OPT_RECEIVE_RATE\n",
587 dccp_role(sk
), sk
, len
);
590 opt_recv
->ccid3or_receive_rate
= ntohl(*(__be32
*)value
);
591 ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n",
593 opt_recv
->ccid3or_receive_rate
);
601 static int ccid3_hc_tx_init(struct ccid
*ccid
, struct sock
*sk
)
603 struct dccp_sock
*dp
= dccp_sk(sk
);
604 struct ccid3_hc_tx_sock
*hctx
= ccid_priv(ccid
);
606 if (dp
->dccps_packet_size
>= TFRC_MIN_PACKET_SIZE
&&
607 dp
->dccps_packet_size
<= TFRC_MAX_PACKET_SIZE
)
608 hctx
->ccid3hctx_s
= dp
->dccps_packet_size
;
610 hctx
->ccid3hctx_s
= TFRC_STD_PACKET_SIZE
;
612 /* Set transmission rate to 1 packet per second */
613 hctx
->ccid3hctx_x
= hctx
->ccid3hctx_s
;
614 hctx
->ccid3hctx_t_rto
= USEC_PER_SEC
;
615 hctx
->ccid3hctx_state
= TFRC_SSTATE_NO_SENT
;
616 INIT_LIST_HEAD(&hctx
->ccid3hctx_hist
);
618 hctx
->ccid3hctx_no_feedback_timer
.function
= ccid3_hc_tx_no_feedback_timer
;
619 hctx
->ccid3hctx_no_feedback_timer
.data
= (unsigned long)sk
;
620 init_timer(&hctx
->ccid3hctx_no_feedback_timer
);
625 static void ccid3_hc_tx_exit(struct sock
*sk
)
627 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
629 BUG_ON(hctx
== NULL
);
631 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_TERM
);
632 sk_stop_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
);
634 /* Empty packet history */
635 dccp_tx_hist_purge(ccid3_tx_hist
, &hctx
->ccid3hctx_hist
);
639 * RX Half Connection methods
642 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
643 static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state
)
645 static char *ccid3_rx_state_names
[] = {
646 [TFRC_RSTATE_NO_DATA
] = "NO_DATA",
647 [TFRC_RSTATE_DATA
] = "DATA",
648 [TFRC_RSTATE_TERM
] = "TERM",
651 return ccid3_rx_state_names
[state
];
655 static void ccid3_hc_rx_set_state(struct sock
*sk
,
656 enum ccid3_hc_rx_states state
)
658 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
659 enum ccid3_hc_rx_states oldstate
= hcrx
->ccid3hcrx_state
;
661 ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
662 dccp_role(sk
), sk
, ccid3_rx_state_name(oldstate
),
663 ccid3_rx_state_name(state
));
664 WARN_ON(state
== oldstate
);
665 hcrx
->ccid3hcrx_state
= state
;
668 static void ccid3_hc_rx_send_feedback(struct sock
*sk
)
670 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
671 struct dccp_sock
*dp
= dccp_sk(sk
);
672 struct dccp_rx_hist_entry
*packet
;
675 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk
), sk
);
677 dccp_timestamp(sk
, &now
);
679 switch (hcrx
->ccid3hcrx_state
) {
680 case TFRC_RSTATE_NO_DATA
:
681 hcrx
->ccid3hcrx_x_recv
= 0;
683 case TFRC_RSTATE_DATA
: {
684 const u32 delta
= timeval_delta(&now
,
685 &hcrx
->ccid3hcrx_tstamp_last_feedback
);
686 hcrx
->ccid3hcrx_x_recv
= usecs_div(hcrx
->ccid3hcrx_bytes_recv
,
690 case TFRC_RSTATE_TERM
:
691 DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk
), sk
);
695 packet
= dccp_rx_hist_find_data_packet(&hcrx
->ccid3hcrx_hist
);
696 if (unlikely(packet
== NULL
)) {
697 DCCP_WARN("%s, sk=%p, no data packet in history!\n",
702 hcrx
->ccid3hcrx_tstamp_last_feedback
= now
;
703 hcrx
->ccid3hcrx_ccval_last_counter
= packet
->dccphrx_ccval
;
704 hcrx
->ccid3hcrx_bytes_recv
= 0;
706 /* Convert to multiples of 10us */
707 hcrx
->ccid3hcrx_elapsed_time
=
708 timeval_delta(&now
, &packet
->dccphrx_tstamp
) / 10;
709 if (hcrx
->ccid3hcrx_p
== 0)
710 hcrx
->ccid3hcrx_pinv
= ~0;
712 hcrx
->ccid3hcrx_pinv
= 1000000 / hcrx
->ccid3hcrx_p
;
713 dp
->dccps_hc_rx_insert_options
= 1;
717 static int ccid3_hc_rx_insert_options(struct sock
*sk
, struct sk_buff
*skb
)
719 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
722 BUG_ON(hcrx
== NULL
);
724 if (!(sk
->sk_state
== DCCP_OPEN
|| sk
->sk_state
== DCCP_PARTOPEN
))
727 DCCP_SKB_CB(skb
)->dccpd_ccval
= hcrx
->ccid3hcrx_ccval_last_counter
;
729 if (dccp_packet_without_ack(skb
))
732 x_recv
= htonl(hcrx
->ccid3hcrx_x_recv
);
733 pinv
= htonl(hcrx
->ccid3hcrx_pinv
);
735 if ((hcrx
->ccid3hcrx_elapsed_time
!= 0 &&
736 dccp_insert_option_elapsed_time(sk
, skb
,
737 hcrx
->ccid3hcrx_elapsed_time
)) ||
738 dccp_insert_option_timestamp(sk
, skb
) ||
739 dccp_insert_option(sk
, skb
, TFRC_OPT_LOSS_EVENT_RATE
,
740 &pinv
, sizeof(pinv
)) ||
741 dccp_insert_option(sk
, skb
, TFRC_OPT_RECEIVE_RATE
,
742 &x_recv
, sizeof(x_recv
)))
748 /* calculate first loss interval
750 * returns estimated loss interval in usecs */
752 static u32
ccid3_hc_rx_calc_first_li(struct sock
*sk
)
754 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
755 struct dccp_rx_hist_entry
*entry
, *next
, *tail
= NULL
;
756 u32 rtt
, delta
, x_recv
, fval
, p
, tmp2
;
757 struct timeval tstamp
= { 0, };
763 list_for_each_entry_safe(entry
, next
, &hcrx
->ccid3hcrx_hist
,
765 if (dccp_rx_hist_entry_data_packet(entry
)) {
770 tstamp
= entry
->dccphrx_tstamp
;
771 win_count
= entry
->dccphrx_ccval
;
775 interval
= win_count
- entry
->dccphrx_ccval
;
777 interval
+= TFRC_WIN_COUNT_LIMIT
;
785 if (unlikely(step
== 0)) {
786 DCCP_WARN("%s, sk=%p, packet history has no data packets!\n",
791 if (unlikely(interval
== 0)) {
792 DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0."
793 "Defaulting to 1\n", dccp_role(sk
), sk
);
798 DCCP_CRIT("tail is null\n");
801 rtt
= timeval_delta(&tstamp
, &tail
->dccphrx_tstamp
) * 4 / interval
;
802 ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n",
803 dccp_role(sk
), sk
, rtt
);
806 DCCP_WARN("RTT==0, setting to 1\n");
810 dccp_timestamp(sk
, &tstamp
);
811 delta
= timeval_delta(&tstamp
, &hcrx
->ccid3hcrx_tstamp_last_feedback
);
812 x_recv
= usecs_div(hcrx
->ccid3hcrx_bytes_recv
, delta
);
815 x_recv
= hcrx
->ccid3hcrx_x_recv
;
817 tmp1
= (u64
)x_recv
* (u64
)rtt
;
818 do_div(tmp1
,10000000);
822 DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv
, rtt
);
826 fval
= (hcrx
->ccid3hcrx_s
* 100000) / tmp2
;
827 /* do not alter order above or you will get overflow on 32 bit */
828 p
= tfrc_calc_x_reverse_lookup(fval
);
829 ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied "
830 "loss rate=%u\n", dccp_role(sk
), sk
, x_recv
, p
);
838 static void ccid3_hc_rx_update_li(struct sock
*sk
, u64 seq_loss
, u8 win_loss
)
840 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
841 struct dccp_li_hist_entry
*head
;
844 if (list_empty(&hcrx
->ccid3hcrx_li_hist
)) {
845 if (!dccp_li_hist_interval_new(ccid3_li_hist
,
846 &hcrx
->ccid3hcrx_li_hist
, seq_loss
, win_loss
))
849 head
= list_entry(hcrx
->ccid3hcrx_li_hist
.next
,
850 struct dccp_li_hist_entry
, dccplih_node
);
851 head
->dccplih_interval
= ccid3_hc_rx_calc_first_li(sk
);
853 struct dccp_li_hist_entry
*entry
;
854 struct list_head
*tail
;
856 head
= list_entry(hcrx
->ccid3hcrx_li_hist
.next
,
857 struct dccp_li_hist_entry
, dccplih_node
);
858 /* FIXME win count check removed as was wrong */
859 /* should make this check with receive history */
860 /* and compare there as per section 10.2 of RFC4342 */
862 /* new loss event detected */
863 /* calculate last interval length */
864 seq_temp
= dccp_delta_seqno(head
->dccplih_seqno
, seq_loss
);
865 entry
= dccp_li_hist_entry_new(ccid3_li_hist
, SLAB_ATOMIC
);
868 DCCP_BUG("out of memory - can not allocate entry");
872 list_add(&entry
->dccplih_node
, &hcrx
->ccid3hcrx_li_hist
);
874 tail
= hcrx
->ccid3hcrx_li_hist
.prev
;
876 kmem_cache_free(ccid3_li_hist
->dccplih_slab
, tail
);
878 /* Create the newest interval */
879 entry
->dccplih_seqno
= seq_loss
;
880 entry
->dccplih_interval
= seq_temp
;
881 entry
->dccplih_win_count
= win_loss
;
885 static int ccid3_hc_rx_detect_loss(struct sock
*sk
,
886 struct dccp_rx_hist_entry
*packet
)
888 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
889 struct dccp_rx_hist_entry
*rx_hist
= dccp_rx_hist_head(&hcrx
->ccid3hcrx_hist
);
890 u64 seqno
= packet
->dccphrx_seqno
;
896 tmp_seqno
= hcrx
->ccid3hcrx_seqno_nonloss
;
899 follows48(packet
->dccphrx_seqno
, hcrx
->ccid3hcrx_seqno_nonloss
)) {
900 hcrx
->ccid3hcrx_seqno_nonloss
= seqno
;
901 hcrx
->ccid3hcrx_ccval_nonloss
= packet
->dccphrx_ccval
;
906 while (dccp_delta_seqno(hcrx
->ccid3hcrx_seqno_nonloss
, seqno
)
907 > TFRC_RECV_NUM_LATE_LOSS
) {
909 ccid3_hc_rx_update_li(sk
, hcrx
->ccid3hcrx_seqno_nonloss
,
910 hcrx
->ccid3hcrx_ccval_nonloss
);
911 tmp_seqno
= hcrx
->ccid3hcrx_seqno_nonloss
;
912 dccp_inc_seqno(&tmp_seqno
);
913 hcrx
->ccid3hcrx_seqno_nonloss
= tmp_seqno
;
914 dccp_inc_seqno(&tmp_seqno
);
915 while (dccp_rx_hist_find_entry(&hcrx
->ccid3hcrx_hist
,
916 tmp_seqno
, &ccval
)) {
917 hcrx
->ccid3hcrx_seqno_nonloss
= tmp_seqno
;
918 hcrx
->ccid3hcrx_ccval_nonloss
= ccval
;
919 dccp_inc_seqno(&tmp_seqno
);
923 /* FIXME - this code could be simplified with above while */
924 /* but works at moment */
925 if (follows48(packet
->dccphrx_seqno
, hcrx
->ccid3hcrx_seqno_nonloss
)) {
926 hcrx
->ccid3hcrx_seqno_nonloss
= seqno
;
927 hcrx
->ccid3hcrx_ccval_nonloss
= packet
->dccphrx_ccval
;
931 dccp_rx_hist_add_packet(ccid3_rx_hist
, &hcrx
->ccid3hcrx_hist
,
932 &hcrx
->ccid3hcrx_li_hist
, packet
,
933 hcrx
->ccid3hcrx_seqno_nonloss
);
937 static void ccid3_hc_rx_packet_recv(struct sock
*sk
, struct sk_buff
*skb
)
939 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
940 const struct dccp_options_received
*opt_recv
;
941 struct dccp_rx_hist_entry
*packet
;
943 u32 p_prev
, rtt_prev
, r_sample
, t_elapsed
;
946 BUG_ON(hcrx
== NULL
);
948 opt_recv
= &dccp_sk(sk
)->dccps_options_received
;
950 switch (DCCP_SKB_CB(skb
)->dccpd_type
) {
952 if (hcrx
->ccid3hcrx_state
== TFRC_RSTATE_NO_DATA
)
954 case DCCP_PKT_DATAACK
:
955 if (opt_recv
->dccpor_timestamp_echo
== 0)
957 rtt_prev
= hcrx
->ccid3hcrx_rtt
;
958 dccp_timestamp(sk
, &now
);
959 timeval_sub_usecs(&now
, opt_recv
->dccpor_timestamp_echo
* 10);
960 r_sample
= timeval_usecs(&now
);
961 t_elapsed
= opt_recv
->dccpor_elapsed_time
* 10;
963 if (unlikely(r_sample
<= t_elapsed
))
964 DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n",
965 r_sample
, t_elapsed
);
967 r_sample
-= t_elapsed
;
969 if (hcrx
->ccid3hcrx_state
== TFRC_RSTATE_NO_DATA
)
970 hcrx
->ccid3hcrx_rtt
= r_sample
;
972 hcrx
->ccid3hcrx_rtt
= (hcrx
->ccid3hcrx_rtt
* 9) / 10 +
975 if (rtt_prev
!= hcrx
->ccid3hcrx_rtt
)
976 ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n",
977 dccp_role(sk
), hcrx
->ccid3hcrx_rtt
,
978 opt_recv
->dccpor_elapsed_time
);
982 default: /* We're not interested in other packet types, move along */
986 packet
= dccp_rx_hist_entry_new(ccid3_rx_hist
, sk
, opt_recv
->dccpor_ndp
,
988 if (unlikely(packet
== NULL
)) {
989 DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet "
990 "to history, consider it lost!\n", dccp_role(sk
), sk
);
994 loss
= ccid3_hc_rx_detect_loss(sk
, packet
);
996 if (DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_ACK
)
999 switch (hcrx
->ccid3hcrx_state
) {
1000 case TFRC_RSTATE_NO_DATA
:
1001 ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial "
1004 dccp_state_name(sk
->sk_state
), skb
);
1005 ccid3_hc_rx_send_feedback(sk
);
1006 ccid3_hc_rx_set_state(sk
, TFRC_RSTATE_DATA
);
1008 case TFRC_RSTATE_DATA
:
1009 hcrx
->ccid3hcrx_bytes_recv
+= skb
->len
-
1010 dccp_hdr(skb
)->dccph_doff
* 4;
1014 dccp_timestamp(sk
, &now
);
1015 if (timeval_delta(&now
, &hcrx
->ccid3hcrx_tstamp_last_ack
) >=
1016 hcrx
->ccid3hcrx_rtt
) {
1017 hcrx
->ccid3hcrx_tstamp_last_ack
= now
;
1018 ccid3_hc_rx_send_feedback(sk
);
1021 case TFRC_RSTATE_TERM
:
1022 DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk
), sk
);
1026 /* Dealing with packet loss */
1027 ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n",
1028 dccp_role(sk
), sk
, dccp_state_name(sk
->sk_state
));
1030 p_prev
= hcrx
->ccid3hcrx_p
;
1032 /* Calculate loss event rate */
1033 if (!list_empty(&hcrx
->ccid3hcrx_li_hist
)) {
1034 u32 i_mean
= dccp_li_hist_calc_i_mean(&hcrx
->ccid3hcrx_li_hist
);
1036 /* Scaling up by 1000000 as fixed decimal */
1038 hcrx
->ccid3hcrx_p
= 1000000 / i_mean
;
1040 DCCP_BUG("empty loss history");
1042 if (hcrx
->ccid3hcrx_p
> p_prev
) {
1043 ccid3_hc_rx_send_feedback(sk
);
1048 static int ccid3_hc_rx_init(struct ccid
*ccid
, struct sock
*sk
)
1050 struct dccp_sock
*dp
= dccp_sk(sk
);
1051 struct ccid3_hc_rx_sock
*hcrx
= ccid_priv(ccid
);
1053 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk
), sk
);
1055 if (dp
->dccps_packet_size
>= TFRC_MIN_PACKET_SIZE
&&
1056 dp
->dccps_packet_size
<= TFRC_MAX_PACKET_SIZE
)
1057 hcrx
->ccid3hcrx_s
= dp
->dccps_packet_size
;
1059 hcrx
->ccid3hcrx_s
= TFRC_STD_PACKET_SIZE
;
1061 hcrx
->ccid3hcrx_state
= TFRC_RSTATE_NO_DATA
;
1062 INIT_LIST_HEAD(&hcrx
->ccid3hcrx_hist
);
1063 INIT_LIST_HEAD(&hcrx
->ccid3hcrx_li_hist
);
1064 dccp_timestamp(sk
, &hcrx
->ccid3hcrx_tstamp_last_ack
);
1065 hcrx
->ccid3hcrx_tstamp_last_feedback
= hcrx
->ccid3hcrx_tstamp_last_ack
;
1066 hcrx
->ccid3hcrx_rtt
= 5000; /* XXX 5ms for now... */
1070 static void ccid3_hc_rx_exit(struct sock
*sk
)
1072 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1074 BUG_ON(hcrx
== NULL
);
1076 ccid3_hc_rx_set_state(sk
, TFRC_RSTATE_TERM
);
1078 /* Empty packet history */
1079 dccp_rx_hist_purge(ccid3_rx_hist
, &hcrx
->ccid3hcrx_hist
);
1081 /* Empty loss interval history */
1082 dccp_li_hist_purge(ccid3_li_hist
, &hcrx
->ccid3hcrx_li_hist
);
1085 static void ccid3_hc_rx_get_info(struct sock
*sk
, struct tcp_info
*info
)
1087 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1089 /* Listen socks doesn't have a private CCID block */
1090 if (sk
->sk_state
== DCCP_LISTEN
)
1093 BUG_ON(hcrx
== NULL
);
1095 info
->tcpi_ca_state
= hcrx
->ccid3hcrx_state
;
1096 info
->tcpi_options
|= TCPI_OPT_TIMESTAMPS
;
1097 info
->tcpi_rcv_rtt
= hcrx
->ccid3hcrx_rtt
;
1100 static void ccid3_hc_tx_get_info(struct sock
*sk
, struct tcp_info
*info
)
1102 const struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
1104 /* Listen socks doesn't have a private CCID block */
1105 if (sk
->sk_state
== DCCP_LISTEN
)
1108 BUG_ON(hctx
== NULL
);
1110 info
->tcpi_rto
= hctx
->ccid3hctx_t_rto
;
1111 info
->tcpi_rtt
= hctx
->ccid3hctx_rtt
;
1114 static int ccid3_hc_rx_getsockopt(struct sock
*sk
, const int optname
, int len
,
1115 u32 __user
*optval
, int __user
*optlen
)
1117 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1120 /* Listen socks doesn't have a private CCID block */
1121 if (sk
->sk_state
== DCCP_LISTEN
)
1125 case DCCP_SOCKOPT_CCID_RX_INFO
:
1126 if (len
< sizeof(hcrx
->ccid3hcrx_tfrc
))
1128 len
= sizeof(hcrx
->ccid3hcrx_tfrc
);
1129 val
= &hcrx
->ccid3hcrx_tfrc
;
1132 return -ENOPROTOOPT
;
1135 if (put_user(len
, optlen
) || copy_to_user(optval
, val
, len
))
1141 static int ccid3_hc_tx_getsockopt(struct sock
*sk
, const int optname
, int len
,
1142 u32 __user
*optval
, int __user
*optlen
)
1144 const struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
1147 /* Listen socks doesn't have a private CCID block */
1148 if (sk
->sk_state
== DCCP_LISTEN
)
1152 case DCCP_SOCKOPT_CCID_TX_INFO
:
1153 if (len
< sizeof(hctx
->ccid3hctx_tfrc
))
1155 len
= sizeof(hctx
->ccid3hctx_tfrc
);
1156 val
= &hctx
->ccid3hctx_tfrc
;
1159 return -ENOPROTOOPT
;
1162 if (put_user(len
, optlen
) || copy_to_user(optval
, val
, len
))
1168 static struct ccid_operations ccid3
= {
1169 .ccid_id
= DCCPC_CCID3
,
1170 .ccid_name
= "ccid3",
1171 .ccid_owner
= THIS_MODULE
,
1172 .ccid_hc_tx_obj_size
= sizeof(struct ccid3_hc_tx_sock
),
1173 .ccid_hc_tx_init
= ccid3_hc_tx_init
,
1174 .ccid_hc_tx_exit
= ccid3_hc_tx_exit
,
1175 .ccid_hc_tx_send_packet
= ccid3_hc_tx_send_packet
,
1176 .ccid_hc_tx_packet_sent
= ccid3_hc_tx_packet_sent
,
1177 .ccid_hc_tx_packet_recv
= ccid3_hc_tx_packet_recv
,
1178 .ccid_hc_tx_insert_options
= ccid3_hc_tx_insert_options
,
1179 .ccid_hc_tx_parse_options
= ccid3_hc_tx_parse_options
,
1180 .ccid_hc_rx_obj_size
= sizeof(struct ccid3_hc_rx_sock
),
1181 .ccid_hc_rx_init
= ccid3_hc_rx_init
,
1182 .ccid_hc_rx_exit
= ccid3_hc_rx_exit
,
1183 .ccid_hc_rx_insert_options
= ccid3_hc_rx_insert_options
,
1184 .ccid_hc_rx_packet_recv
= ccid3_hc_rx_packet_recv
,
1185 .ccid_hc_rx_get_info
= ccid3_hc_rx_get_info
,
1186 .ccid_hc_tx_get_info
= ccid3_hc_tx_get_info
,
1187 .ccid_hc_rx_getsockopt
= ccid3_hc_rx_getsockopt
,
1188 .ccid_hc_tx_getsockopt
= ccid3_hc_tx_getsockopt
,
1191 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
1192 module_param(ccid3_debug
, int, 0444);
1193 MODULE_PARM_DESC(ccid3_debug
, "Enable debug messages");
1196 static __init
int ccid3_module_init(void)
1200 ccid3_rx_hist
= dccp_rx_hist_new("ccid3");
1201 if (ccid3_rx_hist
== NULL
)
1204 ccid3_tx_hist
= dccp_tx_hist_new("ccid3");
1205 if (ccid3_tx_hist
== NULL
)
1208 ccid3_li_hist
= dccp_li_hist_new("ccid3");
1209 if (ccid3_li_hist
== NULL
)
1212 rc
= ccid_register(&ccid3
);
1214 goto out_free_loss_interval_history
;
1218 out_free_loss_interval_history
:
1219 dccp_li_hist_delete(ccid3_li_hist
);
1220 ccid3_li_hist
= NULL
;
1222 dccp_tx_hist_delete(ccid3_tx_hist
);
1223 ccid3_tx_hist
= NULL
;
1225 dccp_rx_hist_delete(ccid3_rx_hist
);
1226 ccid3_rx_hist
= NULL
;
1229 module_init(ccid3_module_init
);
1231 static __exit
void ccid3_module_exit(void)
1233 ccid_unregister(&ccid3
);
1235 if (ccid3_tx_hist
!= NULL
) {
1236 dccp_tx_hist_delete(ccid3_tx_hist
);
1237 ccid3_tx_hist
= NULL
;
1239 if (ccid3_rx_hist
!= NULL
) {
1240 dccp_rx_hist_delete(ccid3_rx_hist
);
1241 ccid3_rx_hist
= NULL
;
1243 if (ccid3_li_hist
!= NULL
) {
1244 dccp_li_hist_delete(ccid3_li_hist
);
1245 ccid3_li_hist
= NULL
;
1248 module_exit(ccid3_module_exit
);
1250 MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, "
1251 "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
1252 MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID");
1253 MODULE_LICENSE("GPL");
1254 MODULE_ALIAS("net-dccp-ccid-3");