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"
44 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
45 static int ccid3_debug
;
46 #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a)
48 #define ccid3_pr_debug(format, a...)
51 static struct dccp_tx_hist
*ccid3_tx_hist
;
52 static struct dccp_rx_hist
*ccid3_rx_hist
;
53 static struct dccp_li_hist
*ccid3_li_hist
;
55 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
56 static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state
)
58 static char *ccid3_state_names
[] = {
59 [TFRC_SSTATE_NO_SENT
] = "NO_SENT",
60 [TFRC_SSTATE_NO_FBACK
] = "NO_FBACK",
61 [TFRC_SSTATE_FBACK
] = "FBACK",
62 [TFRC_SSTATE_TERM
] = "TERM",
65 return ccid3_state_names
[state
];
69 static void ccid3_hc_tx_set_state(struct sock
*sk
,
70 enum ccid3_hc_tx_states state
)
72 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
73 enum ccid3_hc_tx_states oldstate
= hctx
->ccid3hctx_state
;
75 ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
76 dccp_role(sk
), sk
, ccid3_tx_state_name(oldstate
),
77 ccid3_tx_state_name(state
));
78 WARN_ON(state
== oldstate
);
79 hctx
->ccid3hctx_state
= state
;
83 * Recalculate scheduled nominal send time t_nom, inter-packet interval
84 * t_ipi, and delta value. Should be called after each change to X.
86 static inline void ccid3_update_send_time(struct ccid3_hc_tx_sock
*hctx
)
88 timeval_sub_usecs(&hctx
->ccid3hctx_t_nom
, hctx
->ccid3hctx_t_ipi
);
90 /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */
91 hctx
->ccid3hctx_t_ipi
= scaled_div(hctx
->ccid3hctx_s
,
92 hctx
->ccid3hctx_x
>> 6);
94 /* Update nominal send time with regard to the new t_ipi */
95 timeval_add_usecs(&hctx
->ccid3hctx_t_nom
, hctx
->ccid3hctx_t_ipi
);
97 /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */
98 hctx
->ccid3hctx_delta
= min_t(u32
, hctx
->ccid3hctx_t_ipi
/ 2,
99 TFRC_OPSYS_HALF_TIME_GRAN
);
104 * X_calc = calcX(s, R, p);
105 * X = max(min(X_calc, 2 * X_recv), s / t_mbi);
107 * If (now - tld >= R)
108 * X = max(min(2 * X, 2 * X_recv), s / R);
111 * Note: X and X_recv are both stored in units of 64 * bytes/second, to support
112 * fine-grained resolution of sending rates. This requires scaling by 2^6
113 * throughout the code. Only X_calc is unscaled (in bytes/second).
115 * If X has changed, we also update the scheduled send time t_now,
116 * the inter-packet interval t_ipi, and the delta value.
118 static void ccid3_hc_tx_update_x(struct sock
*sk
, struct timeval
*now
)
121 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
122 const __u64 old_x
= hctx
->ccid3hctx_x
;
124 if (hctx
->ccid3hctx_p
> 0) {
126 hctx
->ccid3hctx_x
= min_t(u64
, hctx
->ccid3hctx_x_calc
<< 6,
127 hctx
->ccid3hctx_x_recv
* 2 );
128 hctx
->ccid3hctx_x
= max_t(u64
, hctx
->ccid3hctx_x
,
129 (hctx
->ccid3hctx_s
<< 6)/TFRC_T_MBI
);
131 } else if (timeval_delta(now
, &hctx
->ccid3hctx_t_ld
) -
132 (suseconds_t
)hctx
->ccid3hctx_rtt
>= 0 ) {
134 hctx
->ccid3hctx_x
= max(2 * min(hctx
->ccid3hctx_x
,
135 hctx
->ccid3hctx_x_recv
),
136 scaled_div(hctx
->ccid3hctx_s
<< 6,
137 hctx
->ccid3hctx_rtt
));
138 hctx
->ccid3hctx_t_ld
= *now
;
141 if (hctx
->ccid3hctx_x
!= old_x
)
142 ccid3_update_send_time(hctx
);
146 * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1)
147 * @len: DCCP packet payload size in bytes
149 static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock
*hctx
, int len
)
151 if (unlikely(len
== 0))
152 ccid3_pr_debug("Packet payload length is 0 - not updating\n");
154 hctx
->ccid3hctx_s
= hctx
->ccid3hctx_s
== 0 ? len
:
155 (9 * hctx
->ccid3hctx_s
+ len
) / 10;
157 * Note: We could do a potential optimisation here - when `s' changes,
158 * recalculate sending rate and consequently t_ipi, t_delta, and
159 * t_now. This is however non-standard, and the benefits are not
160 * clear, so it is currently left out.
165 * Update Window Counter using the algorithm from [RFC 4342, 8.1].
166 * The algorithm is not applicable if RTT < 4 microseconds.
168 static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock
*hctx
,
174 if (unlikely(hctx
->ccid3hctx_rtt
< 4)) /* avoid divide-by-zero */
177 delta
= timeval_delta(now
, &hctx
->ccid3hctx_t_last_win_count
);
178 DCCP_BUG_ON(delta
< 0);
180 quarter_rtts
= (u32
)delta
/ (hctx
->ccid3hctx_rtt
/ 4);
182 if (quarter_rtts
> 0) {
183 hctx
->ccid3hctx_t_last_win_count
= *now
;
184 hctx
->ccid3hctx_last_win_count
+= min_t(u32
, quarter_rtts
, 5);
185 hctx
->ccid3hctx_last_win_count
&= 0xF; /* mod 16 */
187 ccid3_pr_debug("now at %#X\n", hctx
->ccid3hctx_last_win_count
);
191 static void ccid3_hc_tx_no_feedback_timer(unsigned long data
)
193 struct sock
*sk
= (struct sock
*)data
;
194 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
195 unsigned long t_nfb
= USEC_PER_SEC
/ 5;
198 if (sock_owned_by_user(sk
)) {
199 /* Try again later. */
200 /* XXX: set some sensible MIB */
204 ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk
), sk
,
205 ccid3_tx_state_name(hctx
->ccid3hctx_state
));
207 switch (hctx
->ccid3hctx_state
) {
208 case TFRC_SSTATE_NO_FBACK
:
209 /* RFC 3448, 4.4: Halve send rate directly */
210 hctx
->ccid3hctx_x
= max_t(u32
, hctx
->ccid3hctx_x
/ 2,
211 (hctx
->ccid3hctx_s
<< 6)/TFRC_T_MBI
);
213 ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %u "
216 ccid3_tx_state_name(hctx
->ccid3hctx_state
),
217 (unsigned)(hctx
->ccid3hctx_x
>> 6));
218 /* The value of R is still undefined and so we can not recompute
219 * the timout value. Keep initial value as per [RFC 4342, 5]. */
220 t_nfb
= TFRC_INITIAL_TIMEOUT
;
221 ccid3_update_send_time(hctx
);
223 case TFRC_SSTATE_FBACK
:
225 * Check if IDLE since last timeout and recv rate is less than
226 * 4 packets (in units of 64*bytes/sec) per RTT
228 if (!hctx
->ccid3hctx_idle
||
229 (hctx
->ccid3hctx_x_recv
>= 4 *
230 scaled_div(hctx
->ccid3hctx_s
<< 6, hctx
->ccid3hctx_rtt
))) {
233 ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n",
235 ccid3_tx_state_name(hctx
->ccid3hctx_state
));
238 * Modify the cached value of X_recv [RFC 3448, 4.4]
240 * If (p == 0 || X_calc > 2 * X_recv)
241 * X_recv = max(X_recv / 2, s / (2 * t_mbi));
243 * X_recv = X_calc / 4;
245 * Note that X_recv is scaled by 2^6 while X_calc is not
247 BUG_ON(hctx
->ccid3hctx_p
&& !hctx
->ccid3hctx_x_calc
);
249 if (hctx
->ccid3hctx_p
== 0 ||
250 hctx
->ccid3hctx_x_calc
> (hctx
->ccid3hctx_x_recv
>> 5)) {
252 hctx
->ccid3hctx_x_recv
=
253 max_t(u64
, hctx
->ccid3hctx_x_recv
/ 2,
254 (hctx
->ccid3hctx_s
<< 6) /
257 if (hctx
->ccid3hctx_p
== 0)
258 dccp_timestamp(sk
, &now
);
260 hctx
->ccid3hctx_x_recv
= hctx
->ccid3hctx_x_calc
<< 4;
262 /* Now recalculate X [RFC 3448, 4.3, step (4)] */
263 ccid3_hc_tx_update_x(sk
, &now
);
266 * Schedule no feedback timer to expire in
267 * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi)
268 * See comments in packet_recv() regarding the value of t_RTO.
270 t_nfb
= max(hctx
->ccid3hctx_t_rto
, 2 * hctx
->ccid3hctx_t_ipi
);
272 case TFRC_SSTATE_NO_SENT
:
273 DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk
), sk
);
275 case TFRC_SSTATE_TERM
:
279 hctx
->ccid3hctx_idle
= 1;
282 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
283 jiffies
+ usecs_to_jiffies(t_nfb
));
291 * > 0: delay (in msecs) that should pass before actually sending
292 * = 0: can send immediately
293 * < 0: error condition; do not send packet
295 static int ccid3_hc_tx_send_packet(struct sock
*sk
, struct sk_buff
*skb
)
297 struct dccp_sock
*dp
= dccp_sk(sk
);
298 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
302 BUG_ON(hctx
== NULL
);
305 * This function is called only for Data and DataAck packets. Sending
306 * zero-sized Data(Ack)s is theoretically possible, but for congestion
307 * control this case is pathological - ignore it.
309 if (unlikely(skb
->len
== 0))
312 dccp_timestamp(sk
, &now
);
314 switch (hctx
->ccid3hctx_state
) {
315 case TFRC_SSTATE_NO_SENT
:
316 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
317 jiffies
+ usecs_to_jiffies(TFRC_INITIAL_TIMEOUT
));
318 hctx
->ccid3hctx_last_win_count
= 0;
319 hctx
->ccid3hctx_t_last_win_count
= now
;
320 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_NO_FBACK
);
322 /* Set initial sending rate X/s to 1pps (X is scaled by 2^6) */
323 ccid3_hc_tx_update_s(hctx
, skb
->len
);
324 hctx
->ccid3hctx_x
= hctx
->ccid3hctx_s
<< 6;
326 /* First timeout, according to [RFC 3448, 4.2], is 1 second */
327 hctx
->ccid3hctx_t_ipi
= USEC_PER_SEC
;
328 /* Initial delta: minimum of 0.5 sec and t_gran/2 */
329 hctx
->ccid3hctx_delta
= TFRC_OPSYS_HALF_TIME_GRAN
;
331 /* Set t_0 for initial packet */
332 hctx
->ccid3hctx_t_nom
= now
;
334 case TFRC_SSTATE_NO_FBACK
:
335 case TFRC_SSTATE_FBACK
:
336 delay
= timeval_delta(&hctx
->ccid3hctx_t_nom
, &now
);
338 * Scheduling of packet transmissions [RFC 3448, 4.6]
340 * if (t_now > t_nom - delta)
341 * // send the packet now
343 * // send the packet in (t_nom - t_now) milliseconds.
345 if (delay
- (suseconds_t
)hctx
->ccid3hctx_delta
>= 0)
346 return delay
/ 1000L;
348 ccid3_hc_tx_update_win_count(hctx
, &now
);
350 case TFRC_SSTATE_TERM
:
351 DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk
), sk
);
355 /* prepare to send now (add options etc.) */
356 dp
->dccps_hc_tx_insert_options
= 1;
357 DCCP_SKB_CB(skb
)->dccpd_ccval
= hctx
->ccid3hctx_last_win_count
;
359 /* set the nominal send time for the next following packet */
360 timeval_add_usecs(&hctx
->ccid3hctx_t_nom
, hctx
->ccid3hctx_t_ipi
);
365 static void ccid3_hc_tx_packet_sent(struct sock
*sk
, int more
, unsigned int len
)
367 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
369 struct dccp_tx_hist_entry
*packet
;
371 BUG_ON(hctx
== NULL
);
373 ccid3_hc_tx_update_s(hctx
, len
);
375 packet
= dccp_tx_hist_entry_new(ccid3_tx_hist
, GFP_ATOMIC
);
376 if (unlikely(packet
== NULL
)) {
377 DCCP_CRIT("packet history - out of memory!");
380 dccp_tx_hist_add_entry(&hctx
->ccid3hctx_hist
, packet
);
382 dccp_timestamp(sk
, &now
);
383 packet
->dccphtx_tstamp
= now
;
384 packet
->dccphtx_seqno
= dccp_sk(sk
)->dccps_gss
;
385 packet
->dccphtx_rtt
= hctx
->ccid3hctx_rtt
;
386 packet
->dccphtx_sent
= 1;
387 hctx
->ccid3hctx_idle
= 0;
390 static void ccid3_hc_tx_packet_recv(struct sock
*sk
, struct sk_buff
*skb
)
392 const struct dccp_sock
*dp
= dccp_sk(sk
);
393 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
394 struct ccid3_options_received
*opt_recv
;
395 struct dccp_tx_hist_entry
*packet
;
399 long r_sample
, t_elapsed
;
401 BUG_ON(hctx
== NULL
);
403 /* we are only interested in ACKs */
404 if (!(DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_ACK
||
405 DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_DATAACK
))
408 opt_recv
= &hctx
->ccid3hctx_options_received
;
410 switch (hctx
->ccid3hctx_state
) {
411 case TFRC_SSTATE_NO_FBACK
:
412 case TFRC_SSTATE_FBACK
:
413 /* get packet from history to look up t_recvdata */
414 packet
= dccp_tx_hist_find_entry(&hctx
->ccid3hctx_hist
,
415 DCCP_SKB_CB(skb
)->dccpd_ack_seq
);
416 if (unlikely(packet
== NULL
)) {
417 DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist "
418 "in history!\n", dccp_role(sk
), sk
,
419 (unsigned long long)DCCP_SKB_CB(skb
)->dccpd_ack_seq
,
420 dccp_packet_name(DCCP_SKB_CB(skb
)->dccpd_type
));
424 /* Update receive rate in units of 64 * bytes/second */
425 hctx
->ccid3hctx_x_recv
= opt_recv
->ccid3or_receive_rate
<< 6;
427 /* Update loss event rate */
428 pinv
= opt_recv
->ccid3or_loss_event_rate
;
429 if (pinv
== ~0U || pinv
== 0) /* see RFC 4342, 8.5 */
430 hctx
->ccid3hctx_p
= 0;
431 else /* can not exceed 100% */
432 hctx
->ccid3hctx_p
= 1000000 / pinv
;
434 dccp_timestamp(sk
, &now
);
437 * Calculate new round trip sample as per [RFC 3448, 4.3] by
438 * R_sample = (now - t_recvdata) - t_elapsed
440 r_sample
= timeval_delta(&now
, &packet
->dccphtx_tstamp
);
441 t_elapsed
= dp
->dccps_options_received
.dccpor_elapsed_time
* 10;
443 DCCP_BUG_ON(r_sample
< 0);
444 if (unlikely(r_sample
<= t_elapsed
))
445 DCCP_WARN("WARNING: r_sample=%ldus <= t_elapsed=%ldus\n",
446 r_sample
, t_elapsed
);
448 r_sample
-= t_elapsed
;
449 CCID3_RTT_SANITY_CHECK(r_sample
);
451 /* Update RTT estimate by
452 * If (No feedback recv)
455 * R = q * R + (1 - q) * R_sample;
457 * q is a constant, RFC 3448 recomments 0.9
459 if (hctx
->ccid3hctx_state
== TFRC_SSTATE_NO_FBACK
) {
461 * Larger Initial Windows [RFC 4342, sec. 5]
462 * We deviate in that we use `s' instead of `MSS'.
464 u16 w_init
= min( 4 * hctx
->ccid3hctx_s
,
465 max(2 * hctx
->ccid3hctx_s
, 4380));
466 hctx
->ccid3hctx_rtt
= r_sample
;
467 hctx
->ccid3hctx_x
= scaled_div(w_init
<< 6, r_sample
);
468 hctx
->ccid3hctx_t_ld
= now
;
470 ccid3_update_send_time(hctx
);
472 ccid3_pr_debug("%s(%p), s=%u, w_init=%u, "
473 "R_sample=%ldus, X=%u\n", dccp_role(sk
),
474 sk
, hctx
->ccid3hctx_s
, w_init
, r_sample
,
475 (unsigned)(hctx
->ccid3hctx_x
>> 6));
477 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_FBACK
);
479 hctx
->ccid3hctx_rtt
= (9 * hctx
->ccid3hctx_rtt
+
480 (u32
)r_sample
) / 10;
482 /* Update sending rate (step 4 of [RFC 3448, 4.3]) */
483 if (hctx
->ccid3hctx_p
> 0)
484 hctx
->ccid3hctx_x_calc
=
485 tfrc_calc_x(hctx
->ccid3hctx_s
,
488 ccid3_hc_tx_update_x(sk
, &now
);
490 ccid3_pr_debug("%s(%p), RTT=%uus (sample=%ldus), s=%u, "
491 "p=%u, X_calc=%u, X=%u\n", dccp_role(sk
),
492 sk
, hctx
->ccid3hctx_rtt
, r_sample
,
493 hctx
->ccid3hctx_s
, hctx
->ccid3hctx_p
,
494 hctx
->ccid3hctx_x_calc
,
495 (unsigned)(hctx
->ccid3hctx_x
>> 6));
498 /* unschedule no feedback timer */
499 sk_stop_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
);
501 /* remove all packets older than the one acked from history */
502 dccp_tx_hist_purge_older(ccid3_tx_hist
,
503 &hctx
->ccid3hctx_hist
, packet
);
505 * As we have calculated new ipi, delta, t_nom it is possible that
506 * we now can send a packet, so wake up dccp_wait_for_ccid
508 sk
->sk_write_space(sk
);
511 * Update timeout interval for the nofeedback timer.
512 * We use a configuration option to increase the lower bound.
513 * This can help avoid triggering the nofeedback timer too often
514 * ('spinning') on LANs with small RTTs.
516 hctx
->ccid3hctx_t_rto
= max_t(u32
, 4 * hctx
->ccid3hctx_rtt
,
517 CONFIG_IP_DCCP_CCID3_RTO
*
518 (USEC_PER_SEC
/1000) );
520 * Schedule no feedback timer to expire in
521 * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi)
523 t_nfb
= max(hctx
->ccid3hctx_t_rto
, 2 * hctx
->ccid3hctx_t_ipi
);
525 ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to "
526 "expire in %lu jiffies (%luus)\n",
528 usecs_to_jiffies(t_nfb
), t_nfb
);
530 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
531 jiffies
+ usecs_to_jiffies(t_nfb
));
534 hctx
->ccid3hctx_idle
= 1;
536 case TFRC_SSTATE_NO_SENT
:
537 /* XXX when implementing bidirectional rx/tx check this again */
538 DCCP_WARN("Illegal ACK received - no packet sent\n");
540 case TFRC_SSTATE_TERM
: /* ignore feedback when closing */
545 static int ccid3_hc_tx_parse_options(struct sock
*sk
, unsigned char option
,
546 unsigned char len
, u16 idx
,
547 unsigned char *value
)
550 const struct dccp_sock
*dp
= dccp_sk(sk
);
551 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
552 struct ccid3_options_received
*opt_recv
;
554 BUG_ON(hctx
== NULL
);
556 opt_recv
= &hctx
->ccid3hctx_options_received
;
558 if (opt_recv
->ccid3or_seqno
!= dp
->dccps_gsr
) {
559 opt_recv
->ccid3or_seqno
= dp
->dccps_gsr
;
560 opt_recv
->ccid3or_loss_event_rate
= ~0;
561 opt_recv
->ccid3or_loss_intervals_idx
= 0;
562 opt_recv
->ccid3or_loss_intervals_len
= 0;
563 opt_recv
->ccid3or_receive_rate
= 0;
567 case TFRC_OPT_LOSS_EVENT_RATE
:
568 if (unlikely(len
!= 4)) {
569 DCCP_WARN("%s, sk=%p, invalid len %d "
570 "for TFRC_OPT_LOSS_EVENT_RATE\n",
571 dccp_role(sk
), sk
, len
);
574 opt_recv
->ccid3or_loss_event_rate
= ntohl(*(__be32
*)value
);
575 ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n",
577 opt_recv
->ccid3or_loss_event_rate
);
580 case TFRC_OPT_LOSS_INTERVALS
:
581 opt_recv
->ccid3or_loss_intervals_idx
= idx
;
582 opt_recv
->ccid3or_loss_intervals_len
= len
;
583 ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n",
585 opt_recv
->ccid3or_loss_intervals_idx
,
586 opt_recv
->ccid3or_loss_intervals_len
);
588 case TFRC_OPT_RECEIVE_RATE
:
589 if (unlikely(len
!= 4)) {
590 DCCP_WARN("%s, sk=%p, invalid len %d "
591 "for TFRC_OPT_RECEIVE_RATE\n",
592 dccp_role(sk
), sk
, len
);
595 opt_recv
->ccid3or_receive_rate
= ntohl(*(__be32
*)value
);
596 ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n",
598 opt_recv
->ccid3or_receive_rate
);
606 static int ccid3_hc_tx_init(struct ccid
*ccid
, struct sock
*sk
)
608 struct ccid3_hc_tx_sock
*hctx
= ccid_priv(ccid
);
610 hctx
->ccid3hctx_s
= 0;
611 hctx
->ccid3hctx_rtt
= 0;
612 hctx
->ccid3hctx_state
= TFRC_SSTATE_NO_SENT
;
613 INIT_LIST_HEAD(&hctx
->ccid3hctx_hist
);
615 hctx
->ccid3hctx_no_feedback_timer
.function
= ccid3_hc_tx_no_feedback_timer
;
616 hctx
->ccid3hctx_no_feedback_timer
.data
= (unsigned long)sk
;
617 init_timer(&hctx
->ccid3hctx_no_feedback_timer
);
622 static void ccid3_hc_tx_exit(struct sock
*sk
)
624 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
626 BUG_ON(hctx
== NULL
);
628 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_TERM
);
629 sk_stop_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
);
631 /* Empty packet history */
632 dccp_tx_hist_purge(ccid3_tx_hist
, &hctx
->ccid3hctx_hist
);
636 * RX Half Connection methods
639 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
640 static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state
)
642 static char *ccid3_rx_state_names
[] = {
643 [TFRC_RSTATE_NO_DATA
] = "NO_DATA",
644 [TFRC_RSTATE_DATA
] = "DATA",
645 [TFRC_RSTATE_TERM
] = "TERM",
648 return ccid3_rx_state_names
[state
];
652 static void ccid3_hc_rx_set_state(struct sock
*sk
,
653 enum ccid3_hc_rx_states state
)
655 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
656 enum ccid3_hc_rx_states oldstate
= hcrx
->ccid3hcrx_state
;
658 ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
659 dccp_role(sk
), sk
, ccid3_rx_state_name(oldstate
),
660 ccid3_rx_state_name(state
));
661 WARN_ON(state
== oldstate
);
662 hcrx
->ccid3hcrx_state
= state
;
665 static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock
*hcrx
, int len
)
667 if (unlikely(len
== 0)) /* don't update on empty packets (e.g. ACKs) */
668 ccid3_pr_debug("Packet payload length is 0 - not updating\n");
670 hcrx
->ccid3hcrx_s
= hcrx
->ccid3hcrx_s
== 0 ? len
:
671 (9 * hcrx
->ccid3hcrx_s
+ len
) / 10;
674 static void ccid3_hc_rx_send_feedback(struct sock
*sk
)
676 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
677 struct dccp_sock
*dp
= dccp_sk(sk
);
678 struct dccp_rx_hist_entry
*packet
;
682 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk
), sk
);
684 dccp_timestamp(sk
, &now
);
686 switch (hcrx
->ccid3hcrx_state
) {
687 case TFRC_RSTATE_NO_DATA
:
688 hcrx
->ccid3hcrx_x_recv
= 0;
690 case TFRC_RSTATE_DATA
:
691 delta
= timeval_delta(&now
,
692 &hcrx
->ccid3hcrx_tstamp_last_feedback
);
693 DCCP_BUG_ON(delta
< 0);
694 hcrx
->ccid3hcrx_x_recv
=
695 scaled_div32(hcrx
->ccid3hcrx_bytes_recv
, delta
);
697 case TFRC_RSTATE_TERM
:
698 DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk
), sk
);
702 packet
= dccp_rx_hist_find_data_packet(&hcrx
->ccid3hcrx_hist
);
703 if (unlikely(packet
== NULL
)) {
704 DCCP_WARN("%s, sk=%p, no data packet in history!\n",
709 hcrx
->ccid3hcrx_tstamp_last_feedback
= now
;
710 hcrx
->ccid3hcrx_ccval_last_counter
= packet
->dccphrx_ccval
;
711 hcrx
->ccid3hcrx_bytes_recv
= 0;
713 /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */
714 delta
= timeval_delta(&now
, &packet
->dccphrx_tstamp
);
715 DCCP_BUG_ON(delta
< 0);
716 hcrx
->ccid3hcrx_elapsed_time
= delta
/ 10;
718 if (hcrx
->ccid3hcrx_p
== 0)
719 hcrx
->ccid3hcrx_pinv
= ~0U; /* see RFC 4342, 8.5 */
720 else if (hcrx
->ccid3hcrx_p
> 1000000) {
721 DCCP_WARN("p (%u) > 100%%\n", hcrx
->ccid3hcrx_p
);
722 hcrx
->ccid3hcrx_pinv
= 1; /* use 100% in this case */
724 hcrx
->ccid3hcrx_pinv
= 1000000 / hcrx
->ccid3hcrx_p
;
726 dp
->dccps_hc_rx_insert_options
= 1;
730 static int ccid3_hc_rx_insert_options(struct sock
*sk
, struct sk_buff
*skb
)
732 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
735 BUG_ON(hcrx
== NULL
);
737 if (!(sk
->sk_state
== DCCP_OPEN
|| sk
->sk_state
== DCCP_PARTOPEN
))
740 DCCP_SKB_CB(skb
)->dccpd_ccval
= hcrx
->ccid3hcrx_ccval_last_counter
;
742 if (dccp_packet_without_ack(skb
))
745 x_recv
= htonl(hcrx
->ccid3hcrx_x_recv
);
746 pinv
= htonl(hcrx
->ccid3hcrx_pinv
);
748 if ((hcrx
->ccid3hcrx_elapsed_time
!= 0 &&
749 dccp_insert_option_elapsed_time(sk
, skb
,
750 hcrx
->ccid3hcrx_elapsed_time
)) ||
751 dccp_insert_option_timestamp(sk
, skb
) ||
752 dccp_insert_option(sk
, skb
, TFRC_OPT_LOSS_EVENT_RATE
,
753 &pinv
, sizeof(pinv
)) ||
754 dccp_insert_option(sk
, skb
, TFRC_OPT_RECEIVE_RATE
,
755 &x_recv
, sizeof(x_recv
)))
761 /* calculate first loss interval
763 * returns estimated loss interval in usecs */
765 static u32
ccid3_hc_rx_calc_first_li(struct sock
*sk
)
767 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
768 struct dccp_rx_hist_entry
*entry
, *next
, *tail
= NULL
;
770 suseconds_t rtt
, delta
;
771 struct timeval tstamp
= { 0, };
777 list_for_each_entry_safe(entry
, next
, &hcrx
->ccid3hcrx_hist
,
779 if (dccp_rx_hist_entry_data_packet(entry
)) {
784 tstamp
= entry
->dccphrx_tstamp
;
785 win_count
= entry
->dccphrx_ccval
;
789 interval
= win_count
- entry
->dccphrx_ccval
;
791 interval
+= TFRC_WIN_COUNT_LIMIT
;
799 if (unlikely(step
== 0)) {
800 DCCP_WARN("%s, sk=%p, packet history has no data packets!\n",
805 if (unlikely(interval
== 0)) {
806 DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0."
807 "Defaulting to 1\n", dccp_role(sk
), sk
);
812 DCCP_CRIT("tail is null\n");
816 delta
= timeval_delta(&tstamp
, &tail
->dccphrx_tstamp
);
817 DCCP_BUG_ON(delta
< 0);
819 rtt
= delta
* 4 / interval
;
820 ccid3_pr_debug("%s, sk=%p, approximated RTT to %ldus\n",
821 dccp_role(sk
), sk
, rtt
);
824 * Determine the length of the first loss interval via inverse lookup.
825 * Assume that X_recv can be computed by the throughput equation
829 * Find some p such that f(p) = fval; return 1/p [RFC 3448, 6.3.1].
831 if (rtt
== 0) { /* would result in divide-by-zero */
832 DCCP_WARN("RTT==0, returning 1/p = 1\n");
836 dccp_timestamp(sk
, &tstamp
);
837 delta
= timeval_delta(&tstamp
, &hcrx
->ccid3hcrx_tstamp_last_feedback
);
838 DCCP_BUG_ON(delta
<= 0);
840 x_recv
= scaled_div32(hcrx
->ccid3hcrx_bytes_recv
, delta
);
841 if (x_recv
== 0) { /* would also trigger divide-by-zero */
842 DCCP_WARN("X_recv==0\n");
843 if ((x_recv
= hcrx
->ccid3hcrx_x_recv
) == 0) {
844 DCCP_BUG("stored value of X_recv is zero");
849 fval
= scaled_div(hcrx
->ccid3hcrx_s
, rtt
);
850 fval
= scaled_div32(fval
, x_recv
);
851 p
= tfrc_calc_x_reverse_lookup(fval
);
853 ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied "
854 "loss rate=%u\n", dccp_role(sk
), sk
, x_recv
, p
);
862 static void ccid3_hc_rx_update_li(struct sock
*sk
, u64 seq_loss
, u8 win_loss
)
864 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
865 struct dccp_li_hist_entry
*head
;
868 if (list_empty(&hcrx
->ccid3hcrx_li_hist
)) {
869 if (!dccp_li_hist_interval_new(ccid3_li_hist
,
870 &hcrx
->ccid3hcrx_li_hist
, seq_loss
, win_loss
))
873 head
= list_entry(hcrx
->ccid3hcrx_li_hist
.next
,
874 struct dccp_li_hist_entry
, dccplih_node
);
875 head
->dccplih_interval
= ccid3_hc_rx_calc_first_li(sk
);
877 struct dccp_li_hist_entry
*entry
;
878 struct list_head
*tail
;
880 head
= list_entry(hcrx
->ccid3hcrx_li_hist
.next
,
881 struct dccp_li_hist_entry
, dccplih_node
);
882 /* FIXME win count check removed as was wrong */
883 /* should make this check with receive history */
884 /* and compare there as per section 10.2 of RFC4342 */
886 /* new loss event detected */
887 /* calculate last interval length */
888 seq_temp
= dccp_delta_seqno(head
->dccplih_seqno
, seq_loss
);
889 entry
= dccp_li_hist_entry_new(ccid3_li_hist
, GFP_ATOMIC
);
892 DCCP_BUG("out of memory - can not allocate entry");
896 list_add(&entry
->dccplih_node
, &hcrx
->ccid3hcrx_li_hist
);
898 tail
= hcrx
->ccid3hcrx_li_hist
.prev
;
900 kmem_cache_free(ccid3_li_hist
->dccplih_slab
, tail
);
902 /* Create the newest interval */
903 entry
->dccplih_seqno
= seq_loss
;
904 entry
->dccplih_interval
= seq_temp
;
905 entry
->dccplih_win_count
= win_loss
;
909 static int ccid3_hc_rx_detect_loss(struct sock
*sk
,
910 struct dccp_rx_hist_entry
*packet
)
912 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
913 struct dccp_rx_hist_entry
*rx_hist
= dccp_rx_hist_head(&hcrx
->ccid3hcrx_hist
);
914 u64 seqno
= packet
->dccphrx_seqno
;
920 tmp_seqno
= hcrx
->ccid3hcrx_seqno_nonloss
;
923 follows48(packet
->dccphrx_seqno
, hcrx
->ccid3hcrx_seqno_nonloss
)) {
924 hcrx
->ccid3hcrx_seqno_nonloss
= seqno
;
925 hcrx
->ccid3hcrx_ccval_nonloss
= packet
->dccphrx_ccval
;
930 while (dccp_delta_seqno(hcrx
->ccid3hcrx_seqno_nonloss
, seqno
)
931 > TFRC_RECV_NUM_LATE_LOSS
) {
933 ccid3_hc_rx_update_li(sk
, hcrx
->ccid3hcrx_seqno_nonloss
,
934 hcrx
->ccid3hcrx_ccval_nonloss
);
935 tmp_seqno
= hcrx
->ccid3hcrx_seqno_nonloss
;
936 dccp_inc_seqno(&tmp_seqno
);
937 hcrx
->ccid3hcrx_seqno_nonloss
= tmp_seqno
;
938 dccp_inc_seqno(&tmp_seqno
);
939 while (dccp_rx_hist_find_entry(&hcrx
->ccid3hcrx_hist
,
940 tmp_seqno
, &ccval
)) {
941 hcrx
->ccid3hcrx_seqno_nonloss
= tmp_seqno
;
942 hcrx
->ccid3hcrx_ccval_nonloss
= ccval
;
943 dccp_inc_seqno(&tmp_seqno
);
947 /* FIXME - this code could be simplified with above while */
948 /* but works at moment */
949 if (follows48(packet
->dccphrx_seqno
, hcrx
->ccid3hcrx_seqno_nonloss
)) {
950 hcrx
->ccid3hcrx_seqno_nonloss
= seqno
;
951 hcrx
->ccid3hcrx_ccval_nonloss
= packet
->dccphrx_ccval
;
955 dccp_rx_hist_add_packet(ccid3_rx_hist
, &hcrx
->ccid3hcrx_hist
,
956 &hcrx
->ccid3hcrx_li_hist
, packet
,
957 hcrx
->ccid3hcrx_seqno_nonloss
);
961 static void ccid3_hc_rx_packet_recv(struct sock
*sk
, struct sk_buff
*skb
)
963 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
964 const struct dccp_options_received
*opt_recv
;
965 struct dccp_rx_hist_entry
*packet
;
967 u32 p_prev
, rtt_prev
;
968 suseconds_t r_sample
, t_elapsed
;
969 int loss
, payload_size
;
971 BUG_ON(hcrx
== NULL
);
973 opt_recv
= &dccp_sk(sk
)->dccps_options_received
;
975 switch (DCCP_SKB_CB(skb
)->dccpd_type
) {
977 if (hcrx
->ccid3hcrx_state
== TFRC_RSTATE_NO_DATA
)
979 case DCCP_PKT_DATAACK
:
980 if (opt_recv
->dccpor_timestamp_echo
== 0)
982 rtt_prev
= hcrx
->ccid3hcrx_rtt
;
983 dccp_timestamp(sk
, &now
);
984 timeval_sub_usecs(&now
, opt_recv
->dccpor_timestamp_echo
* 10);
985 r_sample
= timeval_usecs(&now
);
986 t_elapsed
= opt_recv
->dccpor_elapsed_time
* 10;
988 DCCP_BUG_ON(r_sample
< 0);
989 if (unlikely(r_sample
<= t_elapsed
))
990 DCCP_WARN("r_sample=%ldus, t_elapsed=%ldus\n",
991 r_sample
, t_elapsed
);
993 r_sample
-= t_elapsed
;
994 CCID3_RTT_SANITY_CHECK(r_sample
);
996 if (hcrx
->ccid3hcrx_state
== TFRC_RSTATE_NO_DATA
)
997 hcrx
->ccid3hcrx_rtt
= r_sample
;
999 hcrx
->ccid3hcrx_rtt
= (hcrx
->ccid3hcrx_rtt
* 9) / 10 +
1002 if (rtt_prev
!= hcrx
->ccid3hcrx_rtt
)
1003 ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n",
1004 dccp_role(sk
), hcrx
->ccid3hcrx_rtt
,
1005 opt_recv
->dccpor_elapsed_time
);
1009 default: /* We're not interested in other packet types, move along */
1013 packet
= dccp_rx_hist_entry_new(ccid3_rx_hist
, sk
, opt_recv
->dccpor_ndp
,
1015 if (unlikely(packet
== NULL
)) {
1016 DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet "
1017 "to history, consider it lost!\n", dccp_role(sk
), sk
);
1021 loss
= ccid3_hc_rx_detect_loss(sk
, packet
);
1023 if (DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_ACK
)
1026 payload_size
= skb
->len
- dccp_hdr(skb
)->dccph_doff
* 4;
1027 ccid3_hc_rx_update_s(hcrx
, payload_size
);
1029 switch (hcrx
->ccid3hcrx_state
) {
1030 case TFRC_RSTATE_NO_DATA
:
1031 ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial "
1034 dccp_state_name(sk
->sk_state
), skb
);
1035 ccid3_hc_rx_send_feedback(sk
);
1036 ccid3_hc_rx_set_state(sk
, TFRC_RSTATE_DATA
);
1038 case TFRC_RSTATE_DATA
:
1039 hcrx
->ccid3hcrx_bytes_recv
+= payload_size
;
1043 dccp_timestamp(sk
, &now
);
1044 if (timeval_delta(&now
, &hcrx
->ccid3hcrx_tstamp_last_ack
) -
1045 (suseconds_t
)hcrx
->ccid3hcrx_rtt
>= 0) {
1046 hcrx
->ccid3hcrx_tstamp_last_ack
= now
;
1047 ccid3_hc_rx_send_feedback(sk
);
1050 case TFRC_RSTATE_TERM
:
1051 DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk
), sk
);
1055 /* Dealing with packet loss */
1056 ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n",
1057 dccp_role(sk
), sk
, dccp_state_name(sk
->sk_state
));
1059 p_prev
= hcrx
->ccid3hcrx_p
;
1061 /* Calculate loss event rate */
1062 if (!list_empty(&hcrx
->ccid3hcrx_li_hist
)) {
1063 u32 i_mean
= dccp_li_hist_calc_i_mean(&hcrx
->ccid3hcrx_li_hist
);
1065 /* Scaling up by 1000000 as fixed decimal */
1067 hcrx
->ccid3hcrx_p
= 1000000 / i_mean
;
1069 DCCP_BUG("empty loss history");
1071 if (hcrx
->ccid3hcrx_p
> p_prev
) {
1072 ccid3_hc_rx_send_feedback(sk
);
1077 static int ccid3_hc_rx_init(struct ccid
*ccid
, struct sock
*sk
)
1079 struct ccid3_hc_rx_sock
*hcrx
= ccid_priv(ccid
);
1081 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk
), sk
);
1083 hcrx
->ccid3hcrx_state
= TFRC_RSTATE_NO_DATA
;
1084 INIT_LIST_HEAD(&hcrx
->ccid3hcrx_hist
);
1085 INIT_LIST_HEAD(&hcrx
->ccid3hcrx_li_hist
);
1086 dccp_timestamp(sk
, &hcrx
->ccid3hcrx_tstamp_last_ack
);
1087 hcrx
->ccid3hcrx_tstamp_last_feedback
= hcrx
->ccid3hcrx_tstamp_last_ack
;
1088 hcrx
->ccid3hcrx_s
= 0;
1089 hcrx
->ccid3hcrx_rtt
= 0;
1093 static void ccid3_hc_rx_exit(struct sock
*sk
)
1095 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1097 BUG_ON(hcrx
== NULL
);
1099 ccid3_hc_rx_set_state(sk
, TFRC_RSTATE_TERM
);
1101 /* Empty packet history */
1102 dccp_rx_hist_purge(ccid3_rx_hist
, &hcrx
->ccid3hcrx_hist
);
1104 /* Empty loss interval history */
1105 dccp_li_hist_purge(ccid3_li_hist
, &hcrx
->ccid3hcrx_li_hist
);
1108 static void ccid3_hc_rx_get_info(struct sock
*sk
, struct tcp_info
*info
)
1110 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1112 /* Listen socks doesn't have a private CCID block */
1113 if (sk
->sk_state
== DCCP_LISTEN
)
1116 BUG_ON(hcrx
== NULL
);
1118 info
->tcpi_ca_state
= hcrx
->ccid3hcrx_state
;
1119 info
->tcpi_options
|= TCPI_OPT_TIMESTAMPS
;
1120 info
->tcpi_rcv_rtt
= hcrx
->ccid3hcrx_rtt
;
1123 static void ccid3_hc_tx_get_info(struct sock
*sk
, struct tcp_info
*info
)
1125 const struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
1127 /* Listen socks doesn't have a private CCID block */
1128 if (sk
->sk_state
== DCCP_LISTEN
)
1131 BUG_ON(hctx
== NULL
);
1133 info
->tcpi_rto
= hctx
->ccid3hctx_t_rto
;
1134 info
->tcpi_rtt
= hctx
->ccid3hctx_rtt
;
1137 static int ccid3_hc_rx_getsockopt(struct sock
*sk
, const int optname
, int len
,
1138 u32 __user
*optval
, int __user
*optlen
)
1140 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1143 /* Listen socks doesn't have a private CCID block */
1144 if (sk
->sk_state
== DCCP_LISTEN
)
1148 case DCCP_SOCKOPT_CCID_RX_INFO
:
1149 if (len
< sizeof(hcrx
->ccid3hcrx_tfrc
))
1151 len
= sizeof(hcrx
->ccid3hcrx_tfrc
);
1152 val
= &hcrx
->ccid3hcrx_tfrc
;
1155 return -ENOPROTOOPT
;
1158 if (put_user(len
, optlen
) || copy_to_user(optval
, val
, len
))
1164 static int ccid3_hc_tx_getsockopt(struct sock
*sk
, const int optname
, int len
,
1165 u32 __user
*optval
, int __user
*optlen
)
1167 const struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
1170 /* Listen socks doesn't have a private CCID block */
1171 if (sk
->sk_state
== DCCP_LISTEN
)
1175 case DCCP_SOCKOPT_CCID_TX_INFO
:
1176 if (len
< sizeof(hctx
->ccid3hctx_tfrc
))
1178 len
= sizeof(hctx
->ccid3hctx_tfrc
);
1179 val
= &hctx
->ccid3hctx_tfrc
;
1182 return -ENOPROTOOPT
;
1185 if (put_user(len
, optlen
) || copy_to_user(optval
, val
, len
))
1191 static struct ccid_operations ccid3
= {
1192 .ccid_id
= DCCPC_CCID3
,
1193 .ccid_name
= "ccid3",
1194 .ccid_owner
= THIS_MODULE
,
1195 .ccid_hc_tx_obj_size
= sizeof(struct ccid3_hc_tx_sock
),
1196 .ccid_hc_tx_init
= ccid3_hc_tx_init
,
1197 .ccid_hc_tx_exit
= ccid3_hc_tx_exit
,
1198 .ccid_hc_tx_send_packet
= ccid3_hc_tx_send_packet
,
1199 .ccid_hc_tx_packet_sent
= ccid3_hc_tx_packet_sent
,
1200 .ccid_hc_tx_packet_recv
= ccid3_hc_tx_packet_recv
,
1201 .ccid_hc_tx_parse_options
= ccid3_hc_tx_parse_options
,
1202 .ccid_hc_rx_obj_size
= sizeof(struct ccid3_hc_rx_sock
),
1203 .ccid_hc_rx_init
= ccid3_hc_rx_init
,
1204 .ccid_hc_rx_exit
= ccid3_hc_rx_exit
,
1205 .ccid_hc_rx_insert_options
= ccid3_hc_rx_insert_options
,
1206 .ccid_hc_rx_packet_recv
= ccid3_hc_rx_packet_recv
,
1207 .ccid_hc_rx_get_info
= ccid3_hc_rx_get_info
,
1208 .ccid_hc_tx_get_info
= ccid3_hc_tx_get_info
,
1209 .ccid_hc_rx_getsockopt
= ccid3_hc_rx_getsockopt
,
1210 .ccid_hc_tx_getsockopt
= ccid3_hc_tx_getsockopt
,
1213 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
1214 module_param(ccid3_debug
, int, 0444);
1215 MODULE_PARM_DESC(ccid3_debug
, "Enable debug messages");
1218 static __init
int ccid3_module_init(void)
1222 ccid3_rx_hist
= dccp_rx_hist_new("ccid3");
1223 if (ccid3_rx_hist
== NULL
)
1226 ccid3_tx_hist
= dccp_tx_hist_new("ccid3");
1227 if (ccid3_tx_hist
== NULL
)
1230 ccid3_li_hist
= dccp_li_hist_new("ccid3");
1231 if (ccid3_li_hist
== NULL
)
1234 rc
= ccid_register(&ccid3
);
1236 goto out_free_loss_interval_history
;
1240 out_free_loss_interval_history
:
1241 dccp_li_hist_delete(ccid3_li_hist
);
1242 ccid3_li_hist
= NULL
;
1244 dccp_tx_hist_delete(ccid3_tx_hist
);
1245 ccid3_tx_hist
= NULL
;
1247 dccp_rx_hist_delete(ccid3_rx_hist
);
1248 ccid3_rx_hist
= NULL
;
1251 module_init(ccid3_module_init
);
1253 static __exit
void ccid3_module_exit(void)
1255 ccid_unregister(&ccid3
);
1257 if (ccid3_tx_hist
!= NULL
) {
1258 dccp_tx_hist_delete(ccid3_tx_hist
);
1259 ccid3_tx_hist
= NULL
;
1261 if (ccid3_rx_hist
!= NULL
) {
1262 dccp_rx_hist_delete(ccid3_rx_hist
);
1263 ccid3_rx_hist
= NULL
;
1265 if (ccid3_li_hist
!= NULL
) {
1266 dccp_li_hist_delete(ccid3_li_hist
);
1267 ccid3_li_hist
= NULL
;
1270 module_exit(ccid3_module_exit
);
1272 MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, "
1273 "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
1274 MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID");
1275 MODULE_LICENSE("GPL");
1276 MODULE_ALIAS("net-dccp-ccid-3");