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(((__u64
)hctx
->ccid3hctx_x_calc
) << 6,
127 hctx
->ccid3hctx_x_recv
* 2);
128 hctx
->ccid3hctx_x
= max(hctx
->ccid3hctx_x
,
129 (((__u64
)hctx
->ccid3hctx_s
) << 6) /
132 } else if (timeval_delta(now
, &hctx
->ccid3hctx_t_ld
) -
133 (suseconds_t
)hctx
->ccid3hctx_rtt
>= 0) {
136 max(2 * min(hctx
->ccid3hctx_x
, hctx
->ccid3hctx_x_recv
),
137 scaled_div(((__u64
)hctx
->ccid3hctx_s
) << 6,
138 hctx
->ccid3hctx_rtt
));
139 hctx
->ccid3hctx_t_ld
= *now
;
142 if (hctx
->ccid3hctx_x
!= old_x
)
143 ccid3_update_send_time(hctx
);
147 * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1)
148 * @len: DCCP packet payload size in bytes
150 static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock
*hctx
, int len
)
152 if (unlikely(len
== 0))
153 ccid3_pr_debug("Packet payload length is 0 - not updating\n");
155 hctx
->ccid3hctx_s
= hctx
->ccid3hctx_s
== 0 ? len
:
156 (9 * hctx
->ccid3hctx_s
+ len
) / 10;
158 * Note: We could do a potential optimisation here - when `s' changes,
159 * recalculate sending rate and consequently t_ipi, t_delta, and
160 * t_now. This is however non-standard, and the benefits are not
161 * clear, so it is currently left out.
166 * Update Window Counter using the algorithm from [RFC 4342, 8.1].
167 * The algorithm is not applicable if RTT < 4 microseconds.
169 static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock
*hctx
,
175 if (unlikely(hctx
->ccid3hctx_rtt
< 4)) /* avoid divide-by-zero */
178 delta
= timeval_delta(now
, &hctx
->ccid3hctx_t_last_win_count
);
179 DCCP_BUG_ON(delta
< 0);
181 quarter_rtts
= (u32
)delta
/ (hctx
->ccid3hctx_rtt
/ 4);
183 if (quarter_rtts
> 0) {
184 hctx
->ccid3hctx_t_last_win_count
= *now
;
185 hctx
->ccid3hctx_last_win_count
+= min_t(u32
, quarter_rtts
, 5);
186 hctx
->ccid3hctx_last_win_count
&= 0xF; /* mod 16 */
188 ccid3_pr_debug("now at %#X\n", hctx
->ccid3hctx_last_win_count
);
192 static void ccid3_hc_tx_no_feedback_timer(unsigned long data
)
194 struct sock
*sk
= (struct sock
*)data
;
195 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
196 unsigned long t_nfb
= USEC_PER_SEC
/ 5;
199 if (sock_owned_by_user(sk
)) {
200 /* Try again later. */
201 /* XXX: set some sensible MIB */
205 ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk
), sk
,
206 ccid3_tx_state_name(hctx
->ccid3hctx_state
));
208 switch (hctx
->ccid3hctx_state
) {
209 case TFRC_SSTATE_NO_FBACK
:
210 /* RFC 3448, 4.4: Halve send rate directly */
211 hctx
->ccid3hctx_x
= max(hctx
->ccid3hctx_x
/ 2,
212 (((__u64
)hctx
->ccid3hctx_s
) << 6) /
215 ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u "
216 "bytes/s\n", dccp_role(sk
), sk
,
217 ccid3_tx_state_name(hctx
->ccid3hctx_state
),
218 (unsigned)(hctx
->ccid3hctx_x
>> 6));
219 /* The value of R is still undefined and so we can not recompute
220 * the timout value. Keep initial value as per [RFC 4342, 5]. */
221 t_nfb
= TFRC_INITIAL_TIMEOUT
;
222 ccid3_update_send_time(hctx
);
224 case TFRC_SSTATE_FBACK
:
226 * Check if IDLE since last timeout and recv rate is less than
227 * 4 packets (in units of 64*bytes/sec) per RTT
229 if (!hctx
->ccid3hctx_idle
||
230 (hctx
->ccid3hctx_x_recv
>= 4 *
231 scaled_div(((__u64
)hctx
->ccid3hctx_s
) << 6,
232 hctx
->ccid3hctx_rtt
))) {
235 ccid3_pr_debug("%s(%p, state=%s), not idle\n",
237 ccid3_tx_state_name(hctx
->ccid3hctx_state
));
240 * Modify the cached value of X_recv [RFC 3448, 4.4]
242 * If (p == 0 || X_calc > 2 * X_recv)
243 * X_recv = max(X_recv / 2, s / (2 * t_mbi));
245 * X_recv = X_calc / 4;
247 * Note that X_recv is scaled by 2^6 while X_calc is not
249 BUG_ON(hctx
->ccid3hctx_p
&& !hctx
->ccid3hctx_x_calc
);
251 if (hctx
->ccid3hctx_p
== 0 ||
252 (hctx
->ccid3hctx_x_calc
>
253 (hctx
->ccid3hctx_x_recv
>> 5))) {
255 hctx
->ccid3hctx_x_recv
=
256 max(hctx
->ccid3hctx_x_recv
/ 2,
257 (((__u64
)hctx
->ccid3hctx_s
) << 6) /
260 if (hctx
->ccid3hctx_p
== 0)
261 dccp_timestamp(sk
, &now
);
263 hctx
->ccid3hctx_x_recv
= hctx
->ccid3hctx_x_calc
;
264 hctx
->ccid3hctx_x_recv
<<= 4;
266 /* Now recalculate X [RFC 3448, 4.3, step (4)] */
267 ccid3_hc_tx_update_x(sk
, &now
);
270 * Schedule no feedback timer to expire in
271 * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi)
272 * See comments in packet_recv() regarding the value of t_RTO.
274 t_nfb
= max(hctx
->ccid3hctx_t_rto
, 2 * hctx
->ccid3hctx_t_ipi
);
276 case TFRC_SSTATE_NO_SENT
:
277 DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk
), sk
);
279 case TFRC_SSTATE_TERM
:
283 hctx
->ccid3hctx_idle
= 1;
286 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
287 jiffies
+ usecs_to_jiffies(t_nfb
));
295 * > 0: delay (in msecs) that should pass before actually sending
296 * = 0: can send immediately
297 * < 0: error condition; do not send packet
299 static int ccid3_hc_tx_send_packet(struct sock
*sk
, struct sk_buff
*skb
)
301 struct dccp_sock
*dp
= dccp_sk(sk
);
302 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
306 BUG_ON(hctx
== NULL
);
309 * This function is called only for Data and DataAck packets. Sending
310 * zero-sized Data(Ack)s is theoretically possible, but for congestion
311 * control this case is pathological - ignore it.
313 if (unlikely(skb
->len
== 0))
316 dccp_timestamp(sk
, &now
);
318 switch (hctx
->ccid3hctx_state
) {
319 case TFRC_SSTATE_NO_SENT
:
320 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
322 usecs_to_jiffies(TFRC_INITIAL_TIMEOUT
)));
323 hctx
->ccid3hctx_last_win_count
= 0;
324 hctx
->ccid3hctx_t_last_win_count
= now
;
325 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_NO_FBACK
);
327 /* Set initial sending rate X/s to 1pps (X is scaled by 2^6) */
328 ccid3_hc_tx_update_s(hctx
, skb
->len
);
329 hctx
->ccid3hctx_x
= hctx
->ccid3hctx_s
;
330 hctx
->ccid3hctx_x
<<= 6;
332 /* First timeout, according to [RFC 3448, 4.2], is 1 second */
333 hctx
->ccid3hctx_t_ipi
= USEC_PER_SEC
;
334 /* Initial delta: minimum of 0.5 sec and t_gran/2 */
335 hctx
->ccid3hctx_delta
= TFRC_OPSYS_HALF_TIME_GRAN
;
337 /* Set t_0 for initial packet */
338 hctx
->ccid3hctx_t_nom
= now
;
340 case TFRC_SSTATE_NO_FBACK
:
341 case TFRC_SSTATE_FBACK
:
342 delay
= timeval_delta(&hctx
->ccid3hctx_t_nom
, &now
);
344 * Scheduling of packet transmissions [RFC 3448, 4.6]
346 * if (t_now > t_nom - delta)
347 * // send the packet now
349 * // send the packet in (t_nom - t_now) milliseconds.
351 if (delay
- (suseconds_t
)hctx
->ccid3hctx_delta
>= 0)
352 return delay
/ 1000L;
354 ccid3_hc_tx_update_win_count(hctx
, &now
);
356 case TFRC_SSTATE_TERM
:
357 DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk
), sk
);
361 /* prepare to send now (add options etc.) */
362 dp
->dccps_hc_tx_insert_options
= 1;
363 DCCP_SKB_CB(skb
)->dccpd_ccval
= hctx
->ccid3hctx_last_win_count
;
365 /* set the nominal send time for the next following packet */
366 timeval_add_usecs(&hctx
->ccid3hctx_t_nom
, hctx
->ccid3hctx_t_ipi
);
371 static void ccid3_hc_tx_packet_sent(struct sock
*sk
, int more
,
374 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
376 struct dccp_tx_hist_entry
*packet
;
378 BUG_ON(hctx
== NULL
);
380 ccid3_hc_tx_update_s(hctx
, len
);
382 packet
= dccp_tx_hist_entry_new(ccid3_tx_hist
, GFP_ATOMIC
);
383 if (unlikely(packet
== NULL
)) {
384 DCCP_CRIT("packet history - out of memory!");
387 dccp_tx_hist_add_entry(&hctx
->ccid3hctx_hist
, packet
);
389 dccp_timestamp(sk
, &now
);
390 packet
->dccphtx_tstamp
= now
;
391 packet
->dccphtx_seqno
= dccp_sk(sk
)->dccps_gss
;
392 packet
->dccphtx_rtt
= hctx
->ccid3hctx_rtt
;
393 packet
->dccphtx_sent
= 1;
394 hctx
->ccid3hctx_idle
= 0;
397 static void ccid3_hc_tx_packet_recv(struct sock
*sk
, struct sk_buff
*skb
)
399 const struct dccp_sock
*dp
= dccp_sk(sk
);
400 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
401 struct ccid3_options_received
*opt_recv
;
402 struct dccp_tx_hist_entry
*packet
;
406 suseconds_t r_sample
, t_elapsed
;
408 BUG_ON(hctx
== NULL
);
410 /* we are only interested in ACKs */
411 if (!(DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_ACK
||
412 DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_DATAACK
))
415 opt_recv
= &hctx
->ccid3hctx_options_received
;
417 switch (hctx
->ccid3hctx_state
) {
418 case TFRC_SSTATE_NO_FBACK
:
419 case TFRC_SSTATE_FBACK
:
420 /* get packet from history to look up t_recvdata */
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(%p), seqno %llu(%s) doesn'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
));
431 /* Update receive rate in units of 64 * bytes/second */
432 hctx
->ccid3hctx_x_recv
= opt_recv
->ccid3or_receive_rate
;
433 hctx
->ccid3hctx_x_recv
<<= 6;
435 /* Update loss event rate */
436 pinv
= opt_recv
->ccid3or_loss_event_rate
;
437 if (pinv
== ~0U || pinv
== 0) /* see RFC 4342, 8.5 */
438 hctx
->ccid3hctx_p
= 0;
439 else /* can not exceed 100% */
440 hctx
->ccid3hctx_p
= 1000000 / pinv
;
442 dccp_timestamp(sk
, &now
);
445 * Calculate new round trip sample as per [RFC 3448, 4.3] by
446 * R_sample = (now - t_recvdata) - t_elapsed
448 r_sample
= timeval_delta(&now
, &packet
->dccphtx_tstamp
);
449 t_elapsed
= dp
->dccps_options_received
.dccpor_elapsed_time
* 10;
451 DCCP_BUG_ON(r_sample
< 0);
452 if (unlikely(r_sample
<= t_elapsed
))
453 DCCP_WARN("WARNING: r_sample=%dus <= t_elapsed=%dus\n",
454 (int)r_sample
, (int)t_elapsed
);
456 r_sample
-= t_elapsed
;
457 CCID3_RTT_SANITY_CHECK(r_sample
);
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
) {
469 * Larger Initial Windows [RFC 4342, sec. 5]
470 * We deviate in that we use `s' instead of `MSS'.
472 __u64 w_init
= min(4 * hctx
->ccid3hctx_s
,
473 max(2 * hctx
->ccid3hctx_s
, 4380));
474 hctx
->ccid3hctx_rtt
= r_sample
;
475 hctx
->ccid3hctx_x
= scaled_div(w_init
<< 6, r_sample
);
476 hctx
->ccid3hctx_t_ld
= now
;
478 ccid3_update_send_time(hctx
);
480 ccid3_pr_debug("%s(%p), s=%u, w_init=%llu, "
481 "R_sample=%dus, X=%u\n", dccp_role(sk
),
482 sk
, hctx
->ccid3hctx_s
,
483 (unsigned long long)w_init
,
485 (unsigned)(hctx
->ccid3hctx_x
>> 6));
487 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_FBACK
);
489 hctx
->ccid3hctx_rtt
= (9 * hctx
->ccid3hctx_rtt
+
492 /* Update sending rate (step 4 of [RFC 3448, 4.3]) */
493 if (hctx
->ccid3hctx_p
> 0)
494 hctx
->ccid3hctx_x_calc
=
495 tfrc_calc_x(hctx
->ccid3hctx_s
,
498 ccid3_hc_tx_update_x(sk
, &now
);
500 ccid3_pr_debug("%s(%p), RTT=%uus (sample=%dus), s=%u, "
501 "p=%u, X_calc=%u, X_recv=%u, X=%u\n",
503 sk
, hctx
->ccid3hctx_rtt
, (int)r_sample
,
504 hctx
->ccid3hctx_s
, hctx
->ccid3hctx_p
,
505 hctx
->ccid3hctx_x_calc
,
506 (unsigned)(hctx
->ccid3hctx_x_recv
>> 6),
507 (unsigned)(hctx
->ccid3hctx_x
>> 6));
510 /* unschedule no feedback timer */
511 sk_stop_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
);
513 /* remove all packets older than the one acked from history */
514 dccp_tx_hist_purge_older(ccid3_tx_hist
,
515 &hctx
->ccid3hctx_hist
, packet
);
517 * As we have calculated new ipi, delta, t_nom it is possible
518 * that we now can send a packet, so wake up dccp_wait_for_ccid
520 sk
->sk_write_space(sk
);
523 * Update timeout interval for the nofeedback timer.
524 * We use a configuration option to increase the lower bound.
525 * This can help avoid triggering the nofeedback timer too
526 * often ('spinning') on LANs with small RTTs.
528 hctx
->ccid3hctx_t_rto
= max_t(u32
, 4 * hctx
->ccid3hctx_rtt
,
529 CONFIG_IP_DCCP_CCID3_RTO
*
530 (USEC_PER_SEC
/1000));
532 * Schedule no feedback timer to expire in
533 * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi)
535 t_nfb
= max(hctx
->ccid3hctx_t_rto
, 2 * hctx
->ccid3hctx_t_ipi
);
537 ccid3_pr_debug("%s(%p), Scheduled no feedback timer to "
538 "expire in %lu jiffies (%luus)\n",
540 sk
, usecs_to_jiffies(t_nfb
), t_nfb
);
542 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
543 jiffies
+ usecs_to_jiffies(t_nfb
));
546 hctx
->ccid3hctx_idle
= 1;
548 case TFRC_SSTATE_NO_SENT
: /* fall through */
549 case TFRC_SSTATE_TERM
: /* ignore feedback when closing */
554 static int ccid3_hc_tx_parse_options(struct sock
*sk
, unsigned char option
,
555 unsigned char len
, u16 idx
,
556 unsigned char *value
)
559 const struct dccp_sock
*dp
= dccp_sk(sk
);
560 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
561 struct ccid3_options_received
*opt_recv
;
563 BUG_ON(hctx
== NULL
);
565 opt_recv
= &hctx
->ccid3hctx_options_received
;
567 if (opt_recv
->ccid3or_seqno
!= dp
->dccps_gsr
) {
568 opt_recv
->ccid3or_seqno
= dp
->dccps_gsr
;
569 opt_recv
->ccid3or_loss_event_rate
= ~0;
570 opt_recv
->ccid3or_loss_intervals_idx
= 0;
571 opt_recv
->ccid3or_loss_intervals_len
= 0;
572 opt_recv
->ccid3or_receive_rate
= 0;
576 case TFRC_OPT_LOSS_EVENT_RATE
:
577 if (unlikely(len
!= 4)) {
578 DCCP_WARN("%s(%p), invalid len %d "
579 "for TFRC_OPT_LOSS_EVENT_RATE\n",
580 dccp_role(sk
), sk
, len
);
583 opt_recv
->ccid3or_loss_event_rate
=
584 ntohl(*(__be32
*)value
);
585 ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n",
587 opt_recv
->ccid3or_loss_event_rate
);
590 case TFRC_OPT_LOSS_INTERVALS
:
591 opt_recv
->ccid3or_loss_intervals_idx
= idx
;
592 opt_recv
->ccid3or_loss_intervals_len
= len
;
593 ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n",
595 opt_recv
->ccid3or_loss_intervals_idx
,
596 opt_recv
->ccid3or_loss_intervals_len
);
598 case TFRC_OPT_RECEIVE_RATE
:
599 if (unlikely(len
!= 4)) {
600 DCCP_WARN("%s(%p), invalid len %d "
601 "for TFRC_OPT_RECEIVE_RATE\n",
602 dccp_role(sk
), sk
, len
);
605 opt_recv
->ccid3or_receive_rate
=
606 ntohl(*(__be32
*)value
);
607 ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n",
609 opt_recv
->ccid3or_receive_rate
);
617 static int ccid3_hc_tx_init(struct ccid
*ccid
, struct sock
*sk
)
619 struct ccid3_hc_tx_sock
*hctx
= ccid_priv(ccid
);
621 hctx
->ccid3hctx_s
= 0;
622 hctx
->ccid3hctx_rtt
= 0;
623 hctx
->ccid3hctx_state
= TFRC_SSTATE_NO_SENT
;
624 INIT_LIST_HEAD(&hctx
->ccid3hctx_hist
);
626 hctx
->ccid3hctx_no_feedback_timer
.function
=
627 ccid3_hc_tx_no_feedback_timer
;
628 hctx
->ccid3hctx_no_feedback_timer
.data
= (unsigned long)sk
;
629 init_timer(&hctx
->ccid3hctx_no_feedback_timer
);
634 static void ccid3_hc_tx_exit(struct sock
*sk
)
636 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
638 BUG_ON(hctx
== NULL
);
640 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_TERM
);
641 sk_stop_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
);
643 /* Empty packet history */
644 dccp_tx_hist_purge(ccid3_tx_hist
, &hctx
->ccid3hctx_hist
);
648 * RX Half Connection methods
651 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
652 static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state
)
654 static char *ccid3_rx_state_names
[] = {
655 [TFRC_RSTATE_NO_DATA
] = "NO_DATA",
656 [TFRC_RSTATE_DATA
] = "DATA",
657 [TFRC_RSTATE_TERM
] = "TERM",
660 return ccid3_rx_state_names
[state
];
664 static void ccid3_hc_rx_set_state(struct sock
*sk
,
665 enum ccid3_hc_rx_states state
)
667 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
668 enum ccid3_hc_rx_states oldstate
= hcrx
->ccid3hcrx_state
;
670 ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
671 dccp_role(sk
), sk
, ccid3_rx_state_name(oldstate
),
672 ccid3_rx_state_name(state
));
673 WARN_ON(state
== oldstate
);
674 hcrx
->ccid3hcrx_state
= state
;
677 static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock
*hcrx
, int len
)
679 if (unlikely(len
== 0)) /* don't update on empty packets (e.g. ACKs) */
680 ccid3_pr_debug("Packet payload length is 0 - not updating\n");
682 hcrx
->ccid3hcrx_s
= hcrx
->ccid3hcrx_s
== 0 ? len
:
683 (9 * hcrx
->ccid3hcrx_s
+ len
) / 10;
686 static void ccid3_hc_rx_send_feedback(struct sock
*sk
)
688 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
689 struct dccp_sock
*dp
= dccp_sk(sk
);
690 struct dccp_rx_hist_entry
*packet
;
694 ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk
), sk
);
696 dccp_timestamp(sk
, &now
);
698 switch (hcrx
->ccid3hcrx_state
) {
699 case TFRC_RSTATE_NO_DATA
:
700 hcrx
->ccid3hcrx_x_recv
= 0;
702 case TFRC_RSTATE_DATA
:
703 delta
= timeval_delta(&now
,
704 &hcrx
->ccid3hcrx_tstamp_last_feedback
);
705 DCCP_BUG_ON(delta
< 0);
706 hcrx
->ccid3hcrx_x_recv
=
707 scaled_div32(hcrx
->ccid3hcrx_bytes_recv
, delta
);
709 case TFRC_RSTATE_TERM
:
710 DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk
), sk
);
714 packet
= dccp_rx_hist_find_data_packet(&hcrx
->ccid3hcrx_hist
);
715 if (unlikely(packet
== NULL
)) {
716 DCCP_WARN("%s(%p), no data packet in history!\n",
721 hcrx
->ccid3hcrx_tstamp_last_feedback
= now
;
722 hcrx
->ccid3hcrx_ccval_last_counter
= packet
->dccphrx_ccval
;
723 hcrx
->ccid3hcrx_bytes_recv
= 0;
725 /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */
726 delta
= timeval_delta(&now
, &packet
->dccphrx_tstamp
);
727 DCCP_BUG_ON(delta
< 0);
728 hcrx
->ccid3hcrx_elapsed_time
= delta
/ 10;
730 if (hcrx
->ccid3hcrx_p
== 0)
731 hcrx
->ccid3hcrx_pinv
= ~0U; /* see RFC 4342, 8.5 */
732 else if (hcrx
->ccid3hcrx_p
> 1000000) {
733 DCCP_WARN("p (%u) > 100%%\n", hcrx
->ccid3hcrx_p
);
734 hcrx
->ccid3hcrx_pinv
= 1; /* use 100% in this case */
736 hcrx
->ccid3hcrx_pinv
= 1000000 / hcrx
->ccid3hcrx_p
;
738 dp
->dccps_hc_rx_insert_options
= 1;
742 static int ccid3_hc_rx_insert_options(struct sock
*sk
, struct sk_buff
*skb
)
744 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
747 BUG_ON(hcrx
== NULL
);
749 if (!(sk
->sk_state
== DCCP_OPEN
|| sk
->sk_state
== DCCP_PARTOPEN
))
752 DCCP_SKB_CB(skb
)->dccpd_ccval
= hcrx
->ccid3hcrx_ccval_last_counter
;
754 if (dccp_packet_without_ack(skb
))
757 x_recv
= htonl(hcrx
->ccid3hcrx_x_recv
);
758 pinv
= htonl(hcrx
->ccid3hcrx_pinv
);
760 if ((hcrx
->ccid3hcrx_elapsed_time
!= 0 &&
761 dccp_insert_option_elapsed_time(sk
, skb
,
762 hcrx
->ccid3hcrx_elapsed_time
)) ||
763 dccp_insert_option_timestamp(sk
, skb
) ||
764 dccp_insert_option(sk
, skb
, TFRC_OPT_LOSS_EVENT_RATE
,
765 &pinv
, sizeof(pinv
)) ||
766 dccp_insert_option(sk
, skb
, TFRC_OPT_RECEIVE_RATE
,
767 &x_recv
, sizeof(x_recv
)))
773 /* calculate first loss interval
775 * returns estimated loss interval in usecs */
777 static u32
ccid3_hc_rx_calc_first_li(struct sock
*sk
)
779 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
780 struct dccp_rx_hist_entry
*entry
, *next
, *tail
= NULL
;
782 suseconds_t rtt
, delta
;
783 struct timeval tstamp
= { 0, };
789 list_for_each_entry_safe(entry
, next
, &hcrx
->ccid3hcrx_hist
,
791 if (dccp_rx_hist_entry_data_packet(entry
)) {
796 tstamp
= entry
->dccphrx_tstamp
;
797 win_count
= entry
->dccphrx_ccval
;
801 interval
= win_count
- entry
->dccphrx_ccval
;
803 interval
+= TFRC_WIN_COUNT_LIMIT
;
811 if (unlikely(step
== 0)) {
812 DCCP_WARN("%s(%p), packet history has no data packets!\n",
817 if (unlikely(interval
== 0)) {
818 DCCP_WARN("%s(%p), Could not find a win_count interval > 0."
819 "Defaulting to 1\n", dccp_role(sk
), sk
);
824 DCCP_CRIT("tail is null\n");
828 delta
= timeval_delta(&tstamp
, &tail
->dccphrx_tstamp
);
829 DCCP_BUG_ON(delta
< 0);
831 rtt
= delta
* 4 / interval
;
832 ccid3_pr_debug("%s(%p), approximated RTT to %dus\n",
833 dccp_role(sk
), sk
, (int)rtt
);
836 * Determine the length of the first loss interval via inverse lookup.
837 * Assume that X_recv can be computed by the throughput equation
841 * Find some p such that f(p) = fval; return 1/p [RFC 3448, 6.3.1].
843 if (rtt
== 0) { /* would result in divide-by-zero */
844 DCCP_WARN("RTT==0\n");
848 dccp_timestamp(sk
, &tstamp
);
849 delta
= timeval_delta(&tstamp
, &hcrx
->ccid3hcrx_tstamp_last_feedback
);
850 DCCP_BUG_ON(delta
<= 0);
852 x_recv
= scaled_div32(hcrx
->ccid3hcrx_bytes_recv
, delta
);
853 if (x_recv
== 0) { /* would also trigger divide-by-zero */
854 DCCP_WARN("X_recv==0\n");
855 if ((x_recv
= hcrx
->ccid3hcrx_x_recv
) == 0) {
856 DCCP_BUG("stored value of X_recv is zero");
861 fval
= scaled_div(hcrx
->ccid3hcrx_s
, rtt
);
862 fval
= scaled_div32(fval
, x_recv
);
863 p
= tfrc_calc_x_reverse_lookup(fval
);
865 ccid3_pr_debug("%s(%p), receive rate=%u bytes/s, implied "
866 "loss rate=%u\n", dccp_role(sk
), sk
, x_recv
, p
);
874 static void ccid3_hc_rx_update_li(struct sock
*sk
, u64 seq_loss
, u8 win_loss
)
876 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
877 struct dccp_li_hist_entry
*head
;
880 if (list_empty(&hcrx
->ccid3hcrx_li_hist
)) {
881 if (!dccp_li_hist_interval_new(ccid3_li_hist
,
882 &hcrx
->ccid3hcrx_li_hist
, seq_loss
, win_loss
))
885 head
= list_entry(hcrx
->ccid3hcrx_li_hist
.next
,
886 struct dccp_li_hist_entry
, dccplih_node
);
887 head
->dccplih_interval
= ccid3_hc_rx_calc_first_li(sk
);
889 struct dccp_li_hist_entry
*entry
;
890 struct list_head
*tail
;
892 head
= list_entry(hcrx
->ccid3hcrx_li_hist
.next
,
893 struct dccp_li_hist_entry
, dccplih_node
);
894 /* FIXME win count check removed as was wrong */
895 /* should make this check with receive history */
896 /* and compare there as per section 10.2 of RFC4342 */
898 /* new loss event detected */
899 /* calculate last interval length */
900 seq_temp
= dccp_delta_seqno(head
->dccplih_seqno
, seq_loss
);
901 entry
= dccp_li_hist_entry_new(ccid3_li_hist
, GFP_ATOMIC
);
904 DCCP_BUG("out of memory - can not allocate entry");
908 list_add(&entry
->dccplih_node
, &hcrx
->ccid3hcrx_li_hist
);
910 tail
= hcrx
->ccid3hcrx_li_hist
.prev
;
912 kmem_cache_free(ccid3_li_hist
->dccplih_slab
, tail
);
914 /* Create the newest interval */
915 entry
->dccplih_seqno
= seq_loss
;
916 entry
->dccplih_interval
= seq_temp
;
917 entry
->dccplih_win_count
= win_loss
;
921 static int ccid3_hc_rx_detect_loss(struct sock
*sk
,
922 struct dccp_rx_hist_entry
*packet
)
924 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
925 struct dccp_rx_hist_entry
*rx_hist
=
926 dccp_rx_hist_head(&hcrx
->ccid3hcrx_hist
);
927 u64 seqno
= packet
->dccphrx_seqno
;
933 tmp_seqno
= hcrx
->ccid3hcrx_seqno_nonloss
;
936 follows48(packet
->dccphrx_seqno
, hcrx
->ccid3hcrx_seqno_nonloss
)) {
937 hcrx
->ccid3hcrx_seqno_nonloss
= seqno
;
938 hcrx
->ccid3hcrx_ccval_nonloss
= packet
->dccphrx_ccval
;
943 while (dccp_delta_seqno(hcrx
->ccid3hcrx_seqno_nonloss
, seqno
)
944 > TFRC_RECV_NUM_LATE_LOSS
) {
946 ccid3_hc_rx_update_li(sk
, hcrx
->ccid3hcrx_seqno_nonloss
,
947 hcrx
->ccid3hcrx_ccval_nonloss
);
948 tmp_seqno
= hcrx
->ccid3hcrx_seqno_nonloss
;
949 dccp_inc_seqno(&tmp_seqno
);
950 hcrx
->ccid3hcrx_seqno_nonloss
= tmp_seqno
;
951 dccp_inc_seqno(&tmp_seqno
);
952 while (dccp_rx_hist_find_entry(&hcrx
->ccid3hcrx_hist
,
953 tmp_seqno
, &ccval
)) {
954 hcrx
->ccid3hcrx_seqno_nonloss
= tmp_seqno
;
955 hcrx
->ccid3hcrx_ccval_nonloss
= ccval
;
956 dccp_inc_seqno(&tmp_seqno
);
960 /* FIXME - this code could be simplified with above while */
961 /* but works at moment */
962 if (follows48(packet
->dccphrx_seqno
, hcrx
->ccid3hcrx_seqno_nonloss
)) {
963 hcrx
->ccid3hcrx_seqno_nonloss
= seqno
;
964 hcrx
->ccid3hcrx_ccval_nonloss
= packet
->dccphrx_ccval
;
968 dccp_rx_hist_add_packet(ccid3_rx_hist
, &hcrx
->ccid3hcrx_hist
,
969 &hcrx
->ccid3hcrx_li_hist
, packet
,
970 hcrx
->ccid3hcrx_seqno_nonloss
);
974 static void ccid3_hc_rx_packet_recv(struct sock
*sk
, struct sk_buff
*skb
)
976 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
977 const struct dccp_options_received
*opt_recv
;
978 struct dccp_rx_hist_entry
*packet
;
980 u32 p_prev
, rtt_prev
;
981 suseconds_t r_sample
, t_elapsed
;
982 int loss
, payload_size
;
984 BUG_ON(hcrx
== NULL
);
986 opt_recv
= &dccp_sk(sk
)->dccps_options_received
;
988 switch (DCCP_SKB_CB(skb
)->dccpd_type
) {
990 if (hcrx
->ccid3hcrx_state
== TFRC_RSTATE_NO_DATA
)
992 case DCCP_PKT_DATAACK
:
993 if (opt_recv
->dccpor_timestamp_echo
== 0)
995 rtt_prev
= hcrx
->ccid3hcrx_rtt
;
996 dccp_timestamp(sk
, &now
);
997 timeval_sub_usecs(&now
, opt_recv
->dccpor_timestamp_echo
* 10);
998 r_sample
= timeval_usecs(&now
);
999 t_elapsed
= opt_recv
->dccpor_elapsed_time
* 10;
1001 DCCP_BUG_ON(r_sample
< 0);
1002 if (unlikely(r_sample
<= t_elapsed
))
1003 DCCP_WARN("r_sample=%ldus, t_elapsed=%ldus\n",
1004 (long)r_sample
, (long)t_elapsed
);
1006 r_sample
-= t_elapsed
;
1007 CCID3_RTT_SANITY_CHECK(r_sample
);
1009 if (hcrx
->ccid3hcrx_state
== TFRC_RSTATE_NO_DATA
)
1010 hcrx
->ccid3hcrx_rtt
= r_sample
;
1012 hcrx
->ccid3hcrx_rtt
= (hcrx
->ccid3hcrx_rtt
* 9) / 10 +
1015 if (rtt_prev
!= hcrx
->ccid3hcrx_rtt
)
1016 ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n",
1017 dccp_role(sk
), sk
, hcrx
->ccid3hcrx_rtt
,
1018 opt_recv
->dccpor_elapsed_time
);
1022 default: /* We're not interested in other packet types, move along */
1026 packet
= dccp_rx_hist_entry_new(ccid3_rx_hist
, sk
, opt_recv
->dccpor_ndp
,
1028 if (unlikely(packet
== NULL
)) {
1029 DCCP_WARN("%s(%p), Not enough mem to add rx packet "
1030 "to history, consider it lost!\n", dccp_role(sk
), sk
);
1034 loss
= ccid3_hc_rx_detect_loss(sk
, packet
);
1036 if (DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_ACK
)
1039 payload_size
= skb
->len
- dccp_hdr(skb
)->dccph_doff
* 4;
1040 ccid3_hc_rx_update_s(hcrx
, payload_size
);
1042 switch (hcrx
->ccid3hcrx_state
) {
1043 case TFRC_RSTATE_NO_DATA
:
1044 ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial "
1045 "feedback\n", dccp_role(sk
), sk
,
1046 dccp_state_name(sk
->sk_state
), skb
);
1047 ccid3_hc_rx_send_feedback(sk
);
1048 ccid3_hc_rx_set_state(sk
, TFRC_RSTATE_DATA
);
1050 case TFRC_RSTATE_DATA
:
1051 hcrx
->ccid3hcrx_bytes_recv
+= payload_size
;
1055 dccp_timestamp(sk
, &now
);
1056 if ((timeval_delta(&now
, &hcrx
->ccid3hcrx_tstamp_last_ack
) -
1057 (suseconds_t
)hcrx
->ccid3hcrx_rtt
) >= 0) {
1058 hcrx
->ccid3hcrx_tstamp_last_ack
= now
;
1059 ccid3_hc_rx_send_feedback(sk
);
1062 case TFRC_RSTATE_TERM
:
1063 DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk
), sk
);
1067 /* Dealing with packet loss */
1068 ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n",
1069 dccp_role(sk
), sk
, dccp_state_name(sk
->sk_state
));
1071 p_prev
= hcrx
->ccid3hcrx_p
;
1073 /* Calculate loss event rate */
1074 if (!list_empty(&hcrx
->ccid3hcrx_li_hist
)) {
1075 u32 i_mean
= dccp_li_hist_calc_i_mean(&hcrx
->ccid3hcrx_li_hist
);
1077 /* Scaling up by 1000000 as fixed decimal */
1079 hcrx
->ccid3hcrx_p
= 1000000 / i_mean
;
1081 DCCP_BUG("empty loss history");
1083 if (hcrx
->ccid3hcrx_p
> p_prev
) {
1084 ccid3_hc_rx_send_feedback(sk
);
1089 static int ccid3_hc_rx_init(struct ccid
*ccid
, struct sock
*sk
)
1091 struct ccid3_hc_rx_sock
*hcrx
= ccid_priv(ccid
);
1093 ccid3_pr_debug("entry\n");
1095 hcrx
->ccid3hcrx_state
= TFRC_RSTATE_NO_DATA
;
1096 INIT_LIST_HEAD(&hcrx
->ccid3hcrx_hist
);
1097 INIT_LIST_HEAD(&hcrx
->ccid3hcrx_li_hist
);
1098 dccp_timestamp(sk
, &hcrx
->ccid3hcrx_tstamp_last_ack
);
1099 hcrx
->ccid3hcrx_tstamp_last_feedback
= hcrx
->ccid3hcrx_tstamp_last_ack
;
1100 hcrx
->ccid3hcrx_s
= 0;
1101 hcrx
->ccid3hcrx_rtt
= 0;
1105 static void ccid3_hc_rx_exit(struct sock
*sk
)
1107 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1109 BUG_ON(hcrx
== NULL
);
1111 ccid3_hc_rx_set_state(sk
, TFRC_RSTATE_TERM
);
1113 /* Empty packet history */
1114 dccp_rx_hist_purge(ccid3_rx_hist
, &hcrx
->ccid3hcrx_hist
);
1116 /* Empty loss interval history */
1117 dccp_li_hist_purge(ccid3_li_hist
, &hcrx
->ccid3hcrx_li_hist
);
1120 static void ccid3_hc_rx_get_info(struct sock
*sk
, struct tcp_info
*info
)
1122 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1124 /* Listen socks doesn't have a private CCID block */
1125 if (sk
->sk_state
== DCCP_LISTEN
)
1128 BUG_ON(hcrx
== NULL
);
1130 info
->tcpi_ca_state
= hcrx
->ccid3hcrx_state
;
1131 info
->tcpi_options
|= TCPI_OPT_TIMESTAMPS
;
1132 info
->tcpi_rcv_rtt
= hcrx
->ccid3hcrx_rtt
;
1135 static void ccid3_hc_tx_get_info(struct sock
*sk
, struct tcp_info
*info
)
1137 const struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
1139 /* Listen socks doesn't have a private CCID block */
1140 if (sk
->sk_state
== DCCP_LISTEN
)
1143 BUG_ON(hctx
== NULL
);
1145 info
->tcpi_rto
= hctx
->ccid3hctx_t_rto
;
1146 info
->tcpi_rtt
= hctx
->ccid3hctx_rtt
;
1149 static int ccid3_hc_rx_getsockopt(struct sock
*sk
, const int optname
, int len
,
1150 u32 __user
*optval
, int __user
*optlen
)
1152 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1155 /* Listen socks doesn't have a private CCID block */
1156 if (sk
->sk_state
== DCCP_LISTEN
)
1160 case DCCP_SOCKOPT_CCID_RX_INFO
:
1161 if (len
< sizeof(hcrx
->ccid3hcrx_tfrc
))
1163 len
= sizeof(hcrx
->ccid3hcrx_tfrc
);
1164 val
= &hcrx
->ccid3hcrx_tfrc
;
1167 return -ENOPROTOOPT
;
1170 if (put_user(len
, optlen
) || copy_to_user(optval
, val
, len
))
1176 static int ccid3_hc_tx_getsockopt(struct sock
*sk
, const int optname
, int len
,
1177 u32 __user
*optval
, int __user
*optlen
)
1179 const struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
1182 /* Listen socks doesn't have a private CCID block */
1183 if (sk
->sk_state
== DCCP_LISTEN
)
1187 case DCCP_SOCKOPT_CCID_TX_INFO
:
1188 if (len
< sizeof(hctx
->ccid3hctx_tfrc
))
1190 len
= sizeof(hctx
->ccid3hctx_tfrc
);
1191 val
= &hctx
->ccid3hctx_tfrc
;
1194 return -ENOPROTOOPT
;
1197 if (put_user(len
, optlen
) || copy_to_user(optval
, val
, len
))
1203 static struct ccid_operations ccid3
= {
1204 .ccid_id
= DCCPC_CCID3
,
1205 .ccid_name
= "ccid3",
1206 .ccid_owner
= THIS_MODULE
,
1207 .ccid_hc_tx_obj_size
= sizeof(struct ccid3_hc_tx_sock
),
1208 .ccid_hc_tx_init
= ccid3_hc_tx_init
,
1209 .ccid_hc_tx_exit
= ccid3_hc_tx_exit
,
1210 .ccid_hc_tx_send_packet
= ccid3_hc_tx_send_packet
,
1211 .ccid_hc_tx_packet_sent
= ccid3_hc_tx_packet_sent
,
1212 .ccid_hc_tx_packet_recv
= ccid3_hc_tx_packet_recv
,
1213 .ccid_hc_tx_parse_options
= ccid3_hc_tx_parse_options
,
1214 .ccid_hc_rx_obj_size
= sizeof(struct ccid3_hc_rx_sock
),
1215 .ccid_hc_rx_init
= ccid3_hc_rx_init
,
1216 .ccid_hc_rx_exit
= ccid3_hc_rx_exit
,
1217 .ccid_hc_rx_insert_options
= ccid3_hc_rx_insert_options
,
1218 .ccid_hc_rx_packet_recv
= ccid3_hc_rx_packet_recv
,
1219 .ccid_hc_rx_get_info
= ccid3_hc_rx_get_info
,
1220 .ccid_hc_tx_get_info
= ccid3_hc_tx_get_info
,
1221 .ccid_hc_rx_getsockopt
= ccid3_hc_rx_getsockopt
,
1222 .ccid_hc_tx_getsockopt
= ccid3_hc_tx_getsockopt
,
1225 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
1226 module_param(ccid3_debug
, int, 0444);
1227 MODULE_PARM_DESC(ccid3_debug
, "Enable debug messages");
1230 static __init
int ccid3_module_init(void)
1234 ccid3_rx_hist
= dccp_rx_hist_new("ccid3");
1235 if (ccid3_rx_hist
== NULL
)
1238 ccid3_tx_hist
= dccp_tx_hist_new("ccid3");
1239 if (ccid3_tx_hist
== NULL
)
1242 ccid3_li_hist
= dccp_li_hist_new("ccid3");
1243 if (ccid3_li_hist
== NULL
)
1246 rc
= ccid_register(&ccid3
);
1248 goto out_free_loss_interval_history
;
1252 out_free_loss_interval_history
:
1253 dccp_li_hist_delete(ccid3_li_hist
);
1254 ccid3_li_hist
= NULL
;
1256 dccp_tx_hist_delete(ccid3_tx_hist
);
1257 ccid3_tx_hist
= NULL
;
1259 dccp_rx_hist_delete(ccid3_rx_hist
);
1260 ccid3_rx_hist
= NULL
;
1263 module_init(ccid3_module_init
);
1265 static __exit
void ccid3_module_exit(void)
1267 ccid_unregister(&ccid3
);
1269 if (ccid3_tx_hist
!= NULL
) {
1270 dccp_tx_hist_delete(ccid3_tx_hist
);
1271 ccid3_tx_hist
= NULL
;
1273 if (ccid3_rx_hist
!= NULL
) {
1274 dccp_rx_hist_delete(ccid3_rx_hist
);
1275 ccid3_rx_hist
= NULL
;
1277 if (ccid3_li_hist
!= NULL
) {
1278 dccp_li_hist_delete(ccid3_li_hist
);
1279 ccid3_li_hist
= NULL
;
1282 module_exit(ccid3_module_exit
);
1284 MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, "
1285 "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
1286 MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID");
1287 MODULE_LICENSE("GPL");
1288 MODULE_ALIAS("net-dccp-ccid-3");