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
;
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.
107 static inline void ccid3_update_send_time(struct ccid3_hc_tx_sock
*hctx
)
109 timeval_sub_usecs(&hctx
->ccid3hctx_t_nom
, hctx
->ccid3hctx_t_ipi
);
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
);
114 /* Update nominal send time with regard to the new t_ipi */
115 timeval_add_usecs(&hctx
->ccid3hctx_t_nom
, hctx
->ccid3hctx_t_ipi
);
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
);
124 * x_calc = calcX(s, R, p);
125 * X = max(min(X_calc, 2 * X_recv), s / t_mbi);
127 * If (now - tld >= R)
128 * X = max(min(2 * X, 2 * X_recv), s / R);
131 static void ccid3_hc_tx_update_x(struct sock
*sk
, struct timeval
*now
)
134 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
135 const __u32 old_x
= hctx
->ccid3hctx_x
;
137 /* To avoid large error in calcX */
138 if (hctx
->ccid3hctx_p
>= TFRC_SMALLEST_P
) {
139 hctx
->ccid3hctx_x_calc
= tfrc_calc_x(hctx
->ccid3hctx_s
,
142 hctx
->ccid3hctx_x
= max_t(u32
, min(hctx
->ccid3hctx_x_calc
,
143 hctx
->ccid3hctx_x_recv
* 2),
144 hctx
->ccid3hctx_s
/ TFRC_T_MBI
);
146 } else if (timeval_delta(now
, &hctx
->ccid3hctx_t_ld
) >=
147 hctx
->ccid3hctx_rtt
) {
148 hctx
->ccid3hctx_x
= max(min(hctx
->ccid3hctx_x_recv
,
149 hctx
->ccid3hctx_x
) * 2,
150 usecs_div(hctx
->ccid3hctx_s
,
151 hctx
->ccid3hctx_rtt
) );
152 hctx
->ccid3hctx_t_ld
= *now
;
154 ccid3_pr_debug("Not changing X\n");
156 if (hctx
->ccid3hctx_x
!= old_x
)
157 ccid3_update_send_time(hctx
);
161 * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1)
162 * @len: DCCP packet payload size in bytes
164 static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock
*hctx
, int len
)
166 if (unlikely(len
== 0))
167 ccid3_pr_debug("Packet payload length is 0 - not updating\n");
169 hctx
->ccid3hctx_s
= hctx
->ccid3hctx_s
== 0 ? len
:
170 (9 * hctx
->ccid3hctx_s
+ len
) / 10;
172 * Note: We could do a potential optimisation here - when `s' changes,
173 * recalculate sending rate and consequently t_ipi, t_delta, and
174 * t_now. This is however non-standard, and the benefits are not
175 * clear, so it is currently left out.
179 static void ccid3_hc_tx_no_feedback_timer(unsigned long data
)
181 struct sock
*sk
= (struct sock
*)data
;
182 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
183 unsigned long t_nfb
= USEC_PER_SEC
/ 5;
186 if (sock_owned_by_user(sk
)) {
187 /* Try again later. */
188 /* XXX: set some sensible MIB */
192 ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk
), sk
,
193 ccid3_tx_state_name(hctx
->ccid3hctx_state
));
195 switch (hctx
->ccid3hctx_state
) {
196 case TFRC_SSTATE_NO_FBACK
:
197 /* RFC 3448, 4.4: Halve send rate directly */
198 hctx
->ccid3hctx_x
= min_t(u32
, hctx
->ccid3hctx_x
/ 2,
199 hctx
->ccid3hctx_s
/ TFRC_T_MBI
);
201 ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d "
204 ccid3_tx_state_name(hctx
->ccid3hctx_state
),
206 /* The value of R is still undefined and so we can not recompute
207 * the timout value. Keep initial value as per [RFC 4342, 5]. */
208 t_nfb
= TFRC_INITIAL_TIMEOUT
;
209 ccid3_update_send_time(hctx
);
211 case TFRC_SSTATE_FBACK
:
213 * Check if IDLE since last timeout and recv rate is less than
216 if (!hctx
->ccid3hctx_idle
||
217 (hctx
->ccid3hctx_x_recv
>=
218 4 * usecs_div(hctx
->ccid3hctx_s
, hctx
->ccid3hctx_rtt
))) {
221 ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n",
223 ccid3_tx_state_name(hctx
->ccid3hctx_state
));
224 /* Halve sending rate */
226 /* If (X_calc > 2 * X_recv)
227 * X_recv = max(X_recv / 2, s / (2 * t_mbi));
229 * X_recv = X_calc / 4;
231 BUG_ON(hctx
->ccid3hctx_p
>= TFRC_SMALLEST_P
&&
232 hctx
->ccid3hctx_x_calc
== 0);
234 /* check also if p is zero -> x_calc is infinity? */
235 if (hctx
->ccid3hctx_p
< TFRC_SMALLEST_P
||
236 hctx
->ccid3hctx_x_calc
> 2 * hctx
->ccid3hctx_x_recv
)
237 hctx
->ccid3hctx_x_recv
= max_t(u32
, hctx
->ccid3hctx_x_recv
/ 2,
238 hctx
->ccid3hctx_s
/ (2 * TFRC_T_MBI
));
240 hctx
->ccid3hctx_x_recv
= hctx
->ccid3hctx_x_calc
/ 4;
242 /* Update sending rate */
243 dccp_timestamp(sk
, &now
);
244 ccid3_hc_tx_update_x(sk
, &now
);
247 * Schedule no feedback timer to expire in
248 * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi)
249 * See comments in packet_recv() regarding the value of t_RTO.
251 t_nfb
= max(hctx
->ccid3hctx_t_rto
, 2 * hctx
->ccid3hctx_t_ipi
);
253 case TFRC_SSTATE_NO_SENT
:
254 DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk
), sk
);
256 case TFRC_SSTATE_TERM
:
260 hctx
->ccid3hctx_idle
= 1;
263 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
264 jiffies
+ usecs_to_jiffies(t_nfb
));
272 * > 0: delay (in msecs) that should pass before actually sending
273 * = 0: can send immediately
274 * < 0: error condition; do not send packet
276 static int ccid3_hc_tx_send_packet(struct sock
*sk
, struct sk_buff
*skb
)
278 struct dccp_sock
*dp
= dccp_sk(sk
);
279 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
280 struct dccp_tx_hist_entry
*new_packet
;
284 BUG_ON(hctx
== NULL
);
287 * This function is called only for Data and DataAck packets. Sending
288 * zero-sized Data(Ack)s is theoretically possible, but for congestion
289 * control this case is pathological - ignore it.
291 if (unlikely(skb
->len
== 0))
294 /* See if last packet allocated was not sent */
295 new_packet
= dccp_tx_hist_head(&hctx
->ccid3hctx_hist
);
296 if (new_packet
== NULL
|| new_packet
->dccphtx_sent
) {
297 new_packet
= dccp_tx_hist_entry_new(ccid3_tx_hist
,
300 if (unlikely(new_packet
== NULL
)) {
301 DCCP_WARN("%s, sk=%p, not enough mem to add to history,"
302 "send refused\n", dccp_role(sk
), sk
);
306 dccp_tx_hist_add_entry(&hctx
->ccid3hctx_hist
, new_packet
);
309 dccp_timestamp(sk
, &now
);
311 switch (hctx
->ccid3hctx_state
) {
312 case TFRC_SSTATE_NO_SENT
:
313 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
314 jiffies
+ usecs_to_jiffies(TFRC_INITIAL_TIMEOUT
));
315 hctx
->ccid3hctx_last_win_count
= 0;
316 hctx
->ccid3hctx_t_last_win_count
= now
;
317 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_NO_FBACK
);
319 /* Set initial sending rate to 1 packet per second */
320 ccid3_hc_tx_update_s(hctx
, skb
->len
);
321 hctx
->ccid3hctx_x
= hctx
->ccid3hctx_s
;
323 /* First timeout, according to [RFC 3448, 4.2], is 1 second */
324 hctx
->ccid3hctx_t_ipi
= USEC_PER_SEC
;
325 /* Initial delta: minimum of 0.5 sec and t_gran/2 */
326 hctx
->ccid3hctx_delta
= TFRC_OPSYS_HALF_TIME_GRAN
;
328 /* Set t_0 for initial packet */
329 hctx
->ccid3hctx_t_nom
= now
;
331 case TFRC_SSTATE_NO_FBACK
:
332 case TFRC_SSTATE_FBACK
:
333 delay
= timeval_delta(&hctx
->ccid3hctx_t_nom
, &now
);
335 * Scheduling of packet transmissions [RFC 3448, 4.6]
337 * if (t_now > t_nom - delta)
338 * // send the packet now
340 * // send the packet in (t_nom - t_now) milliseconds.
342 if (delay
- (long)hctx
->ccid3hctx_delta
>= 0)
343 return delay
/ 1000L;
345 case TFRC_SSTATE_TERM
:
346 DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk
), sk
);
350 /* prepare to send now (add options etc.) */
351 dp
->dccps_hc_tx_insert_options
= 1;
352 new_packet
->dccphtx_ccval
= DCCP_SKB_CB(skb
)->dccpd_ccval
=
353 hctx
->ccid3hctx_last_win_count
;
354 timeval_add_usecs(&hctx
->ccid3hctx_t_nom
, hctx
->ccid3hctx_t_ipi
);
359 static void ccid3_hc_tx_packet_sent(struct sock
*sk
, int more
, unsigned int len
)
361 const struct dccp_sock
*dp
= dccp_sk(sk
);
362 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
364 unsigned long quarter_rtt
;
365 struct dccp_tx_hist_entry
*packet
;
367 BUG_ON(hctx
== NULL
);
369 dccp_timestamp(sk
, &now
);
371 ccid3_hc_tx_update_s(hctx
, len
);
373 packet
= dccp_tx_hist_head(&hctx
->ccid3hctx_hist
);
374 if (unlikely(packet
== NULL
)) {
375 DCCP_WARN("packet doesn't exist in history!\n");
378 if (unlikely(packet
->dccphtx_sent
)) {
379 DCCP_WARN("no unsent packet in history!\n");
382 packet
->dccphtx_tstamp
= now
;
383 packet
->dccphtx_seqno
= dp
->dccps_gss
;
385 * Check if win_count have changed
386 * Algorithm in "8.1. Window Counter Value" in RFC 4342.
388 quarter_rtt
= timeval_delta(&now
, &hctx
->ccid3hctx_t_last_win_count
);
389 if (likely(hctx
->ccid3hctx_rtt
> 8))
390 quarter_rtt
/= hctx
->ccid3hctx_rtt
/ 4;
392 if (quarter_rtt
> 0) {
393 hctx
->ccid3hctx_t_last_win_count
= now
;
394 hctx
->ccid3hctx_last_win_count
= (hctx
->ccid3hctx_last_win_count
+
395 min_t(unsigned long, quarter_rtt
, 5)) % 16;
396 ccid3_pr_debug("%s, sk=%p, window changed from "
399 packet
->dccphtx_ccval
,
400 hctx
->ccid3hctx_last_win_count
);
403 hctx
->ccid3hctx_idle
= 0;
404 packet
->dccphtx_rtt
= hctx
->ccid3hctx_rtt
;
405 packet
->dccphtx_sent
= 1;
408 static void ccid3_hc_tx_packet_recv(struct sock
*sk
, struct sk_buff
*skb
)
410 const struct dccp_sock
*dp
= dccp_sk(sk
);
411 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
412 struct ccid3_options_received
*opt_recv
;
413 struct dccp_tx_hist_entry
*packet
;
421 BUG_ON(hctx
== NULL
);
423 /* we are only interested in ACKs */
424 if (!(DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_ACK
||
425 DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_DATAACK
))
428 opt_recv
= &hctx
->ccid3hctx_options_received
;
430 t_elapsed
= dp
->dccps_options_received
.dccpor_elapsed_time
* 10;
431 x_recv
= opt_recv
->ccid3or_receive_rate
;
432 pinv
= opt_recv
->ccid3or_loss_event_rate
;
434 switch (hctx
->ccid3hctx_state
) {
435 case TFRC_SSTATE_NO_FBACK
:
436 case TFRC_SSTATE_FBACK
:
437 /* Calculate new round trip sample by
438 * R_sample = (now - t_recvdata) - t_delay */
439 /* get t_recvdata from history */
440 packet
= dccp_tx_hist_find_entry(&hctx
->ccid3hctx_hist
,
441 DCCP_SKB_CB(skb
)->dccpd_ack_seq
);
442 if (unlikely(packet
== NULL
)) {
443 DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist "
444 "in history!\n", dccp_role(sk
), sk
,
445 (unsigned long long)DCCP_SKB_CB(skb
)->dccpd_ack_seq
,
446 dccp_packet_name(DCCP_SKB_CB(skb
)->dccpd_type
));
451 dccp_timestamp(sk
, &now
);
452 r_sample
= timeval_delta(&now
, &packet
->dccphtx_tstamp
);
453 if (unlikely(r_sample
<= t_elapsed
))
454 DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n",
455 r_sample
, t_elapsed
);
457 r_sample
-= t_elapsed
;
459 /* Update RTT estimate by
460 * If (No feedback recv)
463 * R = q * R + (1 - q) * R_sample;
465 * q is a constant, RFC 3448 recomments 0.9
467 if (hctx
->ccid3hctx_state
== TFRC_SSTATE_NO_FBACK
) {
468 /* Use Larger Initial Windows [RFC 4342, sec. 5]
469 * We deviate in that we use `s' instead of `MSS'. */
470 u16 w_init
= max( 4 * hctx
->ccid3hctx_s
,
471 max(2 * hctx
->ccid3hctx_s
, 4380));
472 hctx
->ccid3hctx_rtt
= r_sample
;
473 hctx
->ccid3hctx_x
= usecs_div(w_init
, r_sample
);
474 hctx
->ccid3hctx_t_ld
= now
;
476 ccid3_update_send_time(hctx
);
477 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_FBACK
);
479 hctx
->ccid3hctx_rtt
= (hctx
->ccid3hctx_rtt
* 9) / 10 +
481 ccid3_hc_tx_update_x(sk
, &now
);
484 ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, "
485 "r_sample=%us\n", dccp_role(sk
), sk
,
486 hctx
->ccid3hctx_rtt
, r_sample
);
488 /* Update receive rate */
489 hctx
->ccid3hctx_x_recv
= x_recv
;/* X_recv in bytes per sec */
491 /* Update loss event rate */
492 if (pinv
== ~0 || pinv
== 0)
493 hctx
->ccid3hctx_p
= 0;
495 hctx
->ccid3hctx_p
= 1000000 / pinv
;
497 if (hctx
->ccid3hctx_p
< TFRC_SMALLEST_P
) {
498 hctx
->ccid3hctx_p
= TFRC_SMALLEST_P
;
499 ccid3_pr_debug("%s, sk=%p, Smallest p used!\n",
504 /* unschedule no feedback timer */
505 sk_stop_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
);
507 /* remove all packets older than the one acked from history */
508 dccp_tx_hist_purge_older(ccid3_tx_hist
,
509 &hctx
->ccid3hctx_hist
, packet
);
511 * As we have calculated new ipi, delta, t_nom it is possible that
512 * we now can send a packet, so wake up dccp_wait_for_ccid
514 sk
->sk_write_space(sk
);
517 * Update timeout interval for the nofeedback timer.
518 * We use a configuration option to increase the lower bound.
519 * This can help avoid triggering the nofeedback timer too often
520 * ('spinning') on LANs with small RTTs.
522 hctx
->ccid3hctx_t_rto
= max_t(u32
, 4 * hctx
->ccid3hctx_rtt
,
523 CONFIG_IP_DCCP_CCID3_RTO
*
524 (USEC_PER_SEC
/1000) );
526 * Schedule no feedback timer to expire in
527 * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi)
529 t_nfb
= max(hctx
->ccid3hctx_t_rto
, 2 * hctx
->ccid3hctx_t_ipi
);
531 ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to "
532 "expire in %lu jiffies (%luus)\n",
534 usecs_to_jiffies(t_nfb
), t_nfb
);
536 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
537 jiffies
+ usecs_to_jiffies(t_nfb
));
540 hctx
->ccid3hctx_idle
= 1;
542 case TFRC_SSTATE_NO_SENT
:
543 DCCP_WARN("Illegal ACK received - no packet has been sent\n");
545 case TFRC_SSTATE_TERM
: /* ignore feedback when closing */
550 static int ccid3_hc_tx_insert_options(struct sock
*sk
, struct sk_buff
*skb
)
552 const struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
554 BUG_ON(hctx
== NULL
);
556 if (sk
->sk_state
== DCCP_OPEN
|| sk
->sk_state
== DCCP_PARTOPEN
)
557 DCCP_SKB_CB(skb
)->dccpd_ccval
= hctx
->ccid3hctx_last_win_count
;
561 static int ccid3_hc_tx_parse_options(struct sock
*sk
, unsigned char option
,
562 unsigned char len
, u16 idx
,
563 unsigned char *value
)
566 const struct dccp_sock
*dp
= dccp_sk(sk
);
567 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
568 struct ccid3_options_received
*opt_recv
;
570 BUG_ON(hctx
== NULL
);
572 opt_recv
= &hctx
->ccid3hctx_options_received
;
574 if (opt_recv
->ccid3or_seqno
!= dp
->dccps_gsr
) {
575 opt_recv
->ccid3or_seqno
= dp
->dccps_gsr
;
576 opt_recv
->ccid3or_loss_event_rate
= ~0;
577 opt_recv
->ccid3or_loss_intervals_idx
= 0;
578 opt_recv
->ccid3or_loss_intervals_len
= 0;
579 opt_recv
->ccid3or_receive_rate
= 0;
583 case TFRC_OPT_LOSS_EVENT_RATE
:
584 if (unlikely(len
!= 4)) {
585 DCCP_WARN("%s, sk=%p, invalid len %d "
586 "for TFRC_OPT_LOSS_EVENT_RATE\n",
587 dccp_role(sk
), sk
, len
);
590 opt_recv
->ccid3or_loss_event_rate
= ntohl(*(__be32
*)value
);
591 ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n",
593 opt_recv
->ccid3or_loss_event_rate
);
596 case TFRC_OPT_LOSS_INTERVALS
:
597 opt_recv
->ccid3or_loss_intervals_idx
= idx
;
598 opt_recv
->ccid3or_loss_intervals_len
= len
;
599 ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n",
601 opt_recv
->ccid3or_loss_intervals_idx
,
602 opt_recv
->ccid3or_loss_intervals_len
);
604 case TFRC_OPT_RECEIVE_RATE
:
605 if (unlikely(len
!= 4)) {
606 DCCP_WARN("%s, sk=%p, invalid len %d "
607 "for TFRC_OPT_RECEIVE_RATE\n",
608 dccp_role(sk
), sk
, len
);
611 opt_recv
->ccid3or_receive_rate
= ntohl(*(__be32
*)value
);
612 ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n",
614 opt_recv
->ccid3or_receive_rate
);
622 static int ccid3_hc_tx_init(struct ccid
*ccid
, struct sock
*sk
)
624 struct ccid3_hc_tx_sock
*hctx
= ccid_priv(ccid
);
626 hctx
->ccid3hctx_s
= 0;
627 hctx
->ccid3hctx_state
= TFRC_SSTATE_NO_SENT
;
628 INIT_LIST_HEAD(&hctx
->ccid3hctx_hist
);
630 hctx
->ccid3hctx_no_feedback_timer
.function
= ccid3_hc_tx_no_feedback_timer
;
631 hctx
->ccid3hctx_no_feedback_timer
.data
= (unsigned long)sk
;
632 init_timer(&hctx
->ccid3hctx_no_feedback_timer
);
637 static void ccid3_hc_tx_exit(struct sock
*sk
)
639 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
641 BUG_ON(hctx
== NULL
);
643 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_TERM
);
644 sk_stop_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
);
646 /* Empty packet history */
647 dccp_tx_hist_purge(ccid3_tx_hist
, &hctx
->ccid3hctx_hist
);
651 * RX Half Connection methods
654 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
655 static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state
)
657 static char *ccid3_rx_state_names
[] = {
658 [TFRC_RSTATE_NO_DATA
] = "NO_DATA",
659 [TFRC_RSTATE_DATA
] = "DATA",
660 [TFRC_RSTATE_TERM
] = "TERM",
663 return ccid3_rx_state_names
[state
];
667 static void ccid3_hc_rx_set_state(struct sock
*sk
,
668 enum ccid3_hc_rx_states state
)
670 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
671 enum ccid3_hc_rx_states oldstate
= hcrx
->ccid3hcrx_state
;
673 ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
674 dccp_role(sk
), sk
, ccid3_rx_state_name(oldstate
),
675 ccid3_rx_state_name(state
));
676 WARN_ON(state
== oldstate
);
677 hcrx
->ccid3hcrx_state
= state
;
680 static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock
*hcrx
, int len
)
682 if (unlikely(len
== 0)) /* don't update on empty packets (e.g. ACKs) */
683 ccid3_pr_debug("Packet payload length is 0 - not updating\n");
685 hcrx
->ccid3hcrx_s
= hcrx
->ccid3hcrx_s
== 0 ? len
:
686 (9 * hcrx
->ccid3hcrx_s
+ len
) / 10;
689 static void ccid3_hc_rx_send_feedback(struct sock
*sk
)
691 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
692 struct dccp_sock
*dp
= dccp_sk(sk
);
693 struct dccp_rx_hist_entry
*packet
;
696 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk
), sk
);
698 dccp_timestamp(sk
, &now
);
700 switch (hcrx
->ccid3hcrx_state
) {
701 case TFRC_RSTATE_NO_DATA
:
702 hcrx
->ccid3hcrx_x_recv
= 0;
704 case TFRC_RSTATE_DATA
: {
705 const u32 delta
= timeval_delta(&now
,
706 &hcrx
->ccid3hcrx_tstamp_last_feedback
);
707 hcrx
->ccid3hcrx_x_recv
= usecs_div(hcrx
->ccid3hcrx_bytes_recv
,
711 case TFRC_RSTATE_TERM
:
712 DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk
), sk
);
716 packet
= dccp_rx_hist_find_data_packet(&hcrx
->ccid3hcrx_hist
);
717 if (unlikely(packet
== NULL
)) {
718 DCCP_WARN("%s, sk=%p, no data packet in history!\n",
723 hcrx
->ccid3hcrx_tstamp_last_feedback
= now
;
724 hcrx
->ccid3hcrx_ccval_last_counter
= packet
->dccphrx_ccval
;
725 hcrx
->ccid3hcrx_bytes_recv
= 0;
727 /* Convert to multiples of 10us */
728 hcrx
->ccid3hcrx_elapsed_time
=
729 timeval_delta(&now
, &packet
->dccphrx_tstamp
) / 10;
730 if (hcrx
->ccid3hcrx_p
== 0)
731 hcrx
->ccid3hcrx_pinv
= ~0;
733 hcrx
->ccid3hcrx_pinv
= 1000000 / hcrx
->ccid3hcrx_p
;
734 dp
->dccps_hc_rx_insert_options
= 1;
738 static int ccid3_hc_rx_insert_options(struct sock
*sk
, struct sk_buff
*skb
)
740 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
743 BUG_ON(hcrx
== NULL
);
745 if (!(sk
->sk_state
== DCCP_OPEN
|| sk
->sk_state
== DCCP_PARTOPEN
))
748 DCCP_SKB_CB(skb
)->dccpd_ccval
= hcrx
->ccid3hcrx_ccval_last_counter
;
750 if (dccp_packet_without_ack(skb
))
753 x_recv
= htonl(hcrx
->ccid3hcrx_x_recv
);
754 pinv
= htonl(hcrx
->ccid3hcrx_pinv
);
756 if ((hcrx
->ccid3hcrx_elapsed_time
!= 0 &&
757 dccp_insert_option_elapsed_time(sk
, skb
,
758 hcrx
->ccid3hcrx_elapsed_time
)) ||
759 dccp_insert_option_timestamp(sk
, skb
) ||
760 dccp_insert_option(sk
, skb
, TFRC_OPT_LOSS_EVENT_RATE
,
761 &pinv
, sizeof(pinv
)) ||
762 dccp_insert_option(sk
, skb
, TFRC_OPT_RECEIVE_RATE
,
763 &x_recv
, sizeof(x_recv
)))
769 /* calculate first loss interval
771 * returns estimated loss interval in usecs */
773 static u32
ccid3_hc_rx_calc_first_li(struct sock
*sk
)
775 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
776 struct dccp_rx_hist_entry
*entry
, *next
, *tail
= NULL
;
777 u32 rtt
, delta
, x_recv
, fval
, p
, tmp2
;
778 struct timeval tstamp
= { 0, };
784 list_for_each_entry_safe(entry
, next
, &hcrx
->ccid3hcrx_hist
,
786 if (dccp_rx_hist_entry_data_packet(entry
)) {
791 tstamp
= entry
->dccphrx_tstamp
;
792 win_count
= entry
->dccphrx_ccval
;
796 interval
= win_count
- entry
->dccphrx_ccval
;
798 interval
+= TFRC_WIN_COUNT_LIMIT
;
806 if (unlikely(step
== 0)) {
807 DCCP_WARN("%s, sk=%p, packet history has no data packets!\n",
812 if (unlikely(interval
== 0)) {
813 DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0."
814 "Defaulting to 1\n", dccp_role(sk
), sk
);
819 DCCP_CRIT("tail is null\n");
822 rtt
= timeval_delta(&tstamp
, &tail
->dccphrx_tstamp
) * 4 / interval
;
823 ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n",
824 dccp_role(sk
), sk
, rtt
);
827 DCCP_WARN("RTT==0, setting to 1\n");
831 dccp_timestamp(sk
, &tstamp
);
832 delta
= timeval_delta(&tstamp
, &hcrx
->ccid3hcrx_tstamp_last_feedback
);
833 x_recv
= usecs_div(hcrx
->ccid3hcrx_bytes_recv
, delta
);
836 x_recv
= hcrx
->ccid3hcrx_x_recv
;
838 tmp1
= (u64
)x_recv
* (u64
)rtt
;
839 do_div(tmp1
,10000000);
843 DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv
, rtt
);
847 fval
= (hcrx
->ccid3hcrx_s
* 100000) / tmp2
;
848 /* do not alter order above or you will get overflow on 32 bit */
849 p
= tfrc_calc_x_reverse_lookup(fval
);
850 ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied "
851 "loss rate=%u\n", dccp_role(sk
), sk
, x_recv
, p
);
859 static void ccid3_hc_rx_update_li(struct sock
*sk
, u64 seq_loss
, u8 win_loss
)
861 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
862 struct dccp_li_hist_entry
*head
;
865 if (list_empty(&hcrx
->ccid3hcrx_li_hist
)) {
866 if (!dccp_li_hist_interval_new(ccid3_li_hist
,
867 &hcrx
->ccid3hcrx_li_hist
, seq_loss
, win_loss
))
870 head
= list_entry(hcrx
->ccid3hcrx_li_hist
.next
,
871 struct dccp_li_hist_entry
, dccplih_node
);
872 head
->dccplih_interval
= ccid3_hc_rx_calc_first_li(sk
);
874 struct dccp_li_hist_entry
*entry
;
875 struct list_head
*tail
;
877 head
= list_entry(hcrx
->ccid3hcrx_li_hist
.next
,
878 struct dccp_li_hist_entry
, dccplih_node
);
879 /* FIXME win count check removed as was wrong */
880 /* should make this check with receive history */
881 /* and compare there as per section 10.2 of RFC4342 */
883 /* new loss event detected */
884 /* calculate last interval length */
885 seq_temp
= dccp_delta_seqno(head
->dccplih_seqno
, seq_loss
);
886 entry
= dccp_li_hist_entry_new(ccid3_li_hist
, SLAB_ATOMIC
);
889 DCCP_BUG("out of memory - can not allocate entry");
893 list_add(&entry
->dccplih_node
, &hcrx
->ccid3hcrx_li_hist
);
895 tail
= hcrx
->ccid3hcrx_li_hist
.prev
;
897 kmem_cache_free(ccid3_li_hist
->dccplih_slab
, tail
);
899 /* Create the newest interval */
900 entry
->dccplih_seqno
= seq_loss
;
901 entry
->dccplih_interval
= seq_temp
;
902 entry
->dccplih_win_count
= win_loss
;
906 static int ccid3_hc_rx_detect_loss(struct sock
*sk
,
907 struct dccp_rx_hist_entry
*packet
)
909 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
910 struct dccp_rx_hist_entry
*rx_hist
= dccp_rx_hist_head(&hcrx
->ccid3hcrx_hist
);
911 u64 seqno
= packet
->dccphrx_seqno
;
917 tmp_seqno
= hcrx
->ccid3hcrx_seqno_nonloss
;
920 follows48(packet
->dccphrx_seqno
, hcrx
->ccid3hcrx_seqno_nonloss
)) {
921 hcrx
->ccid3hcrx_seqno_nonloss
= seqno
;
922 hcrx
->ccid3hcrx_ccval_nonloss
= packet
->dccphrx_ccval
;
927 while (dccp_delta_seqno(hcrx
->ccid3hcrx_seqno_nonloss
, seqno
)
928 > TFRC_RECV_NUM_LATE_LOSS
) {
930 ccid3_hc_rx_update_li(sk
, hcrx
->ccid3hcrx_seqno_nonloss
,
931 hcrx
->ccid3hcrx_ccval_nonloss
);
932 tmp_seqno
= hcrx
->ccid3hcrx_seqno_nonloss
;
933 dccp_inc_seqno(&tmp_seqno
);
934 hcrx
->ccid3hcrx_seqno_nonloss
= tmp_seqno
;
935 dccp_inc_seqno(&tmp_seqno
);
936 while (dccp_rx_hist_find_entry(&hcrx
->ccid3hcrx_hist
,
937 tmp_seqno
, &ccval
)) {
938 hcrx
->ccid3hcrx_seqno_nonloss
= tmp_seqno
;
939 hcrx
->ccid3hcrx_ccval_nonloss
= ccval
;
940 dccp_inc_seqno(&tmp_seqno
);
944 /* FIXME - this code could be simplified with above while */
945 /* but works at moment */
946 if (follows48(packet
->dccphrx_seqno
, hcrx
->ccid3hcrx_seqno_nonloss
)) {
947 hcrx
->ccid3hcrx_seqno_nonloss
= seqno
;
948 hcrx
->ccid3hcrx_ccval_nonloss
= packet
->dccphrx_ccval
;
952 dccp_rx_hist_add_packet(ccid3_rx_hist
, &hcrx
->ccid3hcrx_hist
,
953 &hcrx
->ccid3hcrx_li_hist
, packet
,
954 hcrx
->ccid3hcrx_seqno_nonloss
);
958 static void ccid3_hc_rx_packet_recv(struct sock
*sk
, struct sk_buff
*skb
)
960 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
961 const struct dccp_options_received
*opt_recv
;
962 struct dccp_rx_hist_entry
*packet
;
964 u32 p_prev
, rtt_prev
, r_sample
, t_elapsed
;
965 int loss
, payload_size
;
967 BUG_ON(hcrx
== NULL
);
969 opt_recv
= &dccp_sk(sk
)->dccps_options_received
;
971 switch (DCCP_SKB_CB(skb
)->dccpd_type
) {
973 if (hcrx
->ccid3hcrx_state
== TFRC_RSTATE_NO_DATA
)
975 case DCCP_PKT_DATAACK
:
976 if (opt_recv
->dccpor_timestamp_echo
== 0)
978 rtt_prev
= hcrx
->ccid3hcrx_rtt
;
979 dccp_timestamp(sk
, &now
);
980 timeval_sub_usecs(&now
, opt_recv
->dccpor_timestamp_echo
* 10);
981 r_sample
= timeval_usecs(&now
);
982 t_elapsed
= opt_recv
->dccpor_elapsed_time
* 10;
984 if (unlikely(r_sample
<= t_elapsed
))
985 DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n",
986 r_sample
, t_elapsed
);
988 r_sample
-= t_elapsed
;
990 if (hcrx
->ccid3hcrx_state
== TFRC_RSTATE_NO_DATA
)
991 hcrx
->ccid3hcrx_rtt
= r_sample
;
993 hcrx
->ccid3hcrx_rtt
= (hcrx
->ccid3hcrx_rtt
* 9) / 10 +
996 if (rtt_prev
!= hcrx
->ccid3hcrx_rtt
)
997 ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n",
998 dccp_role(sk
), hcrx
->ccid3hcrx_rtt
,
999 opt_recv
->dccpor_elapsed_time
);
1003 default: /* We're not interested in other packet types, move along */
1007 packet
= dccp_rx_hist_entry_new(ccid3_rx_hist
, sk
, opt_recv
->dccpor_ndp
,
1009 if (unlikely(packet
== NULL
)) {
1010 DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet "
1011 "to history, consider it lost!\n", dccp_role(sk
), sk
);
1015 loss
= ccid3_hc_rx_detect_loss(sk
, packet
);
1017 if (DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_ACK
)
1020 payload_size
= skb
->len
- dccp_hdr(skb
)->dccph_doff
* 4;
1021 ccid3_hc_rx_update_s(hcrx
, payload_size
);
1023 switch (hcrx
->ccid3hcrx_state
) {
1024 case TFRC_RSTATE_NO_DATA
:
1025 ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial "
1028 dccp_state_name(sk
->sk_state
), skb
);
1029 ccid3_hc_rx_send_feedback(sk
);
1030 ccid3_hc_rx_set_state(sk
, TFRC_RSTATE_DATA
);
1032 case TFRC_RSTATE_DATA
:
1033 hcrx
->ccid3hcrx_bytes_recv
+= payload_size
;
1037 dccp_timestamp(sk
, &now
);
1038 if (timeval_delta(&now
, &hcrx
->ccid3hcrx_tstamp_last_ack
) >=
1039 hcrx
->ccid3hcrx_rtt
) {
1040 hcrx
->ccid3hcrx_tstamp_last_ack
= now
;
1041 ccid3_hc_rx_send_feedback(sk
);
1044 case TFRC_RSTATE_TERM
:
1045 DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk
), sk
);
1049 /* Dealing with packet loss */
1050 ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n",
1051 dccp_role(sk
), sk
, dccp_state_name(sk
->sk_state
));
1053 p_prev
= hcrx
->ccid3hcrx_p
;
1055 /* Calculate loss event rate */
1056 if (!list_empty(&hcrx
->ccid3hcrx_li_hist
)) {
1057 u32 i_mean
= dccp_li_hist_calc_i_mean(&hcrx
->ccid3hcrx_li_hist
);
1059 /* Scaling up by 1000000 as fixed decimal */
1061 hcrx
->ccid3hcrx_p
= 1000000 / i_mean
;
1063 DCCP_BUG("empty loss history");
1065 if (hcrx
->ccid3hcrx_p
> p_prev
) {
1066 ccid3_hc_rx_send_feedback(sk
);
1071 static int ccid3_hc_rx_init(struct ccid
*ccid
, struct sock
*sk
)
1073 struct ccid3_hc_rx_sock
*hcrx
= ccid_priv(ccid
);
1075 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk
), sk
);
1077 hcrx
->ccid3hcrx_state
= TFRC_RSTATE_NO_DATA
;
1078 INIT_LIST_HEAD(&hcrx
->ccid3hcrx_hist
);
1079 INIT_LIST_HEAD(&hcrx
->ccid3hcrx_li_hist
);
1080 dccp_timestamp(sk
, &hcrx
->ccid3hcrx_tstamp_last_ack
);
1081 hcrx
->ccid3hcrx_tstamp_last_feedback
= hcrx
->ccid3hcrx_tstamp_last_ack
;
1082 hcrx
->ccid3hcrx_s
= 0;
1083 hcrx
->ccid3hcrx_rtt
= 5000; /* XXX 5ms for now... */
1087 static void ccid3_hc_rx_exit(struct sock
*sk
)
1089 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1091 BUG_ON(hcrx
== NULL
);
1093 ccid3_hc_rx_set_state(sk
, TFRC_RSTATE_TERM
);
1095 /* Empty packet history */
1096 dccp_rx_hist_purge(ccid3_rx_hist
, &hcrx
->ccid3hcrx_hist
);
1098 /* Empty loss interval history */
1099 dccp_li_hist_purge(ccid3_li_hist
, &hcrx
->ccid3hcrx_li_hist
);
1102 static void ccid3_hc_rx_get_info(struct sock
*sk
, struct tcp_info
*info
)
1104 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1106 /* Listen socks doesn't have a private CCID block */
1107 if (sk
->sk_state
== DCCP_LISTEN
)
1110 BUG_ON(hcrx
== NULL
);
1112 info
->tcpi_ca_state
= hcrx
->ccid3hcrx_state
;
1113 info
->tcpi_options
|= TCPI_OPT_TIMESTAMPS
;
1114 info
->tcpi_rcv_rtt
= hcrx
->ccid3hcrx_rtt
;
1117 static void ccid3_hc_tx_get_info(struct sock
*sk
, struct tcp_info
*info
)
1119 const struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
1121 /* Listen socks doesn't have a private CCID block */
1122 if (sk
->sk_state
== DCCP_LISTEN
)
1125 BUG_ON(hctx
== NULL
);
1127 info
->tcpi_rto
= hctx
->ccid3hctx_t_rto
;
1128 info
->tcpi_rtt
= hctx
->ccid3hctx_rtt
;
1131 static int ccid3_hc_rx_getsockopt(struct sock
*sk
, const int optname
, int len
,
1132 u32 __user
*optval
, int __user
*optlen
)
1134 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1137 /* Listen socks doesn't have a private CCID block */
1138 if (sk
->sk_state
== DCCP_LISTEN
)
1142 case DCCP_SOCKOPT_CCID_RX_INFO
:
1143 if (len
< sizeof(hcrx
->ccid3hcrx_tfrc
))
1145 len
= sizeof(hcrx
->ccid3hcrx_tfrc
);
1146 val
= &hcrx
->ccid3hcrx_tfrc
;
1149 return -ENOPROTOOPT
;
1152 if (put_user(len
, optlen
) || copy_to_user(optval
, val
, len
))
1158 static int ccid3_hc_tx_getsockopt(struct sock
*sk
, const int optname
, int len
,
1159 u32 __user
*optval
, int __user
*optlen
)
1161 const struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
1164 /* Listen socks doesn't have a private CCID block */
1165 if (sk
->sk_state
== DCCP_LISTEN
)
1169 case DCCP_SOCKOPT_CCID_TX_INFO
:
1170 if (len
< sizeof(hctx
->ccid3hctx_tfrc
))
1172 len
= sizeof(hctx
->ccid3hctx_tfrc
);
1173 val
= &hctx
->ccid3hctx_tfrc
;
1176 return -ENOPROTOOPT
;
1179 if (put_user(len
, optlen
) || copy_to_user(optval
, val
, len
))
1185 static struct ccid_operations ccid3
= {
1186 .ccid_id
= DCCPC_CCID3
,
1187 .ccid_name
= "ccid3",
1188 .ccid_owner
= THIS_MODULE
,
1189 .ccid_hc_tx_obj_size
= sizeof(struct ccid3_hc_tx_sock
),
1190 .ccid_hc_tx_init
= ccid3_hc_tx_init
,
1191 .ccid_hc_tx_exit
= ccid3_hc_tx_exit
,
1192 .ccid_hc_tx_send_packet
= ccid3_hc_tx_send_packet
,
1193 .ccid_hc_tx_packet_sent
= ccid3_hc_tx_packet_sent
,
1194 .ccid_hc_tx_packet_recv
= ccid3_hc_tx_packet_recv
,
1195 .ccid_hc_tx_insert_options
= ccid3_hc_tx_insert_options
,
1196 .ccid_hc_tx_parse_options
= ccid3_hc_tx_parse_options
,
1197 .ccid_hc_rx_obj_size
= sizeof(struct ccid3_hc_rx_sock
),
1198 .ccid_hc_rx_init
= ccid3_hc_rx_init
,
1199 .ccid_hc_rx_exit
= ccid3_hc_rx_exit
,
1200 .ccid_hc_rx_insert_options
= ccid3_hc_rx_insert_options
,
1201 .ccid_hc_rx_packet_recv
= ccid3_hc_rx_packet_recv
,
1202 .ccid_hc_rx_get_info
= ccid3_hc_rx_get_info
,
1203 .ccid_hc_tx_get_info
= ccid3_hc_tx_get_info
,
1204 .ccid_hc_rx_getsockopt
= ccid3_hc_rx_getsockopt
,
1205 .ccid_hc_tx_getsockopt
= ccid3_hc_tx_getsockopt
,
1208 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
1209 module_param(ccid3_debug
, int, 0444);
1210 MODULE_PARM_DESC(ccid3_debug
, "Enable debug messages");
1213 static __init
int ccid3_module_init(void)
1217 ccid3_rx_hist
= dccp_rx_hist_new("ccid3");
1218 if (ccid3_rx_hist
== NULL
)
1221 ccid3_tx_hist
= dccp_tx_hist_new("ccid3");
1222 if (ccid3_tx_hist
== NULL
)
1225 ccid3_li_hist
= dccp_li_hist_new("ccid3");
1226 if (ccid3_li_hist
== NULL
)
1229 rc
= ccid_register(&ccid3
);
1231 goto out_free_loss_interval_history
;
1235 out_free_loss_interval_history
:
1236 dccp_li_hist_delete(ccid3_li_hist
);
1237 ccid3_li_hist
= NULL
;
1239 dccp_tx_hist_delete(ccid3_tx_hist
);
1240 ccid3_tx_hist
= NULL
;
1242 dccp_rx_hist_delete(ccid3_rx_hist
);
1243 ccid3_rx_hist
= NULL
;
1246 module_init(ccid3_module_init
);
1248 static __exit
void ccid3_module_exit(void)
1250 ccid_unregister(&ccid3
);
1252 if (ccid3_tx_hist
!= NULL
) {
1253 dccp_tx_hist_delete(ccid3_tx_hist
);
1254 ccid3_tx_hist
= NULL
;
1256 if (ccid3_rx_hist
!= NULL
) {
1257 dccp_rx_hist_delete(ccid3_rx_hist
);
1258 ccid3_rx_hist
= NULL
;
1260 if (ccid3_li_hist
!= NULL
) {
1261 dccp_li_hist_delete(ccid3_li_hist
);
1262 ccid3_li_hist
= NULL
;
1265 module_exit(ccid3_module_exit
);
1267 MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, "
1268 "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
1269 MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID");
1270 MODULE_LICENSE("GPL");
1271 MODULE_ALIAS("net-dccp-ccid-3");