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.
38 #include "lib/packet_history.h"
39 #include "lib/loss_interval.h"
43 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
44 static int ccid3_debug
;
45 #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a)
47 #define ccid3_pr_debug(format, a...)
50 static struct dccp_tx_hist
*ccid3_tx_hist
;
51 static struct dccp_rx_hist
*ccid3_rx_hist
;
52 static struct dccp_li_hist
*ccid3_li_hist
;
55 * Transmitter Half-Connection Routines
57 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
58 static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state
)
60 static char *ccid3_state_names
[] = {
61 [TFRC_SSTATE_NO_SENT
] = "NO_SENT",
62 [TFRC_SSTATE_NO_FBACK
] = "NO_FBACK",
63 [TFRC_SSTATE_FBACK
] = "FBACK",
64 [TFRC_SSTATE_TERM
] = "TERM",
67 return ccid3_state_names
[state
];
71 static void ccid3_hc_tx_set_state(struct sock
*sk
,
72 enum ccid3_hc_tx_states state
)
74 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
75 enum ccid3_hc_tx_states oldstate
= hctx
->ccid3hctx_state
;
77 ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
78 dccp_role(sk
), sk
, ccid3_tx_state_name(oldstate
),
79 ccid3_tx_state_name(state
));
80 WARN_ON(state
== oldstate
);
81 hctx
->ccid3hctx_state
= state
;
85 * Compute the initial sending rate X_init according to RFC 3390:
86 * w_init = min(4 * MSS, max(2 * MSS, 4380 bytes))
87 * X_init = w_init / RTT
88 * For consistency with other parts of the code, X_init is scaled by 2^6.
90 static inline u64
rfc3390_initial_rate(struct sock
*sk
)
92 const struct dccp_sock
*dp
= dccp_sk(sk
);
93 const __u32 w_init
= min(4 * dp
->dccps_mss_cache
,
94 max(2 * dp
->dccps_mss_cache
, 4380U));
96 return scaled_div(w_init
<< 6, ccid3_hc_tx_sk(sk
)->ccid3hctx_rtt
);
100 * Recalculate t_ipi and delta (should be called whenever X changes)
102 static inline void ccid3_update_send_interval(struct ccid3_hc_tx_sock
*hctx
)
104 /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */
105 hctx
->ccid3hctx_t_ipi
= scaled_div(hctx
->ccid3hctx_s
,
106 hctx
->ccid3hctx_x
>> 6);
108 /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */
109 hctx
->ccid3hctx_delta
= min_t(u32
, hctx
->ccid3hctx_t_ipi
/ 2,
110 TFRC_OPSYS_HALF_TIME_GRAN
);
112 ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n",
113 hctx
->ccid3hctx_t_ipi
, hctx
->ccid3hctx_delta
,
114 hctx
->ccid3hctx_s
, (unsigned)(hctx
->ccid3hctx_x
>> 6));
120 * X_calc = calcX(s, R, p);
121 * X = max(min(X_calc, 2 * X_recv), s / t_mbi);
123 * If (now - tld >= R)
124 * X = max(min(2 * X, 2 * X_recv), s / R);
127 * Note: X and X_recv are both stored in units of 64 * bytes/second, to support
128 * fine-grained resolution of sending rates. This requires scaling by 2^6
129 * throughout the code. Only X_calc is unscaled (in bytes/second).
132 static void ccid3_hc_tx_update_x(struct sock
*sk
, struct timeval
*now
)
135 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
136 __u64 min_rate
= 2 * hctx
->ccid3hctx_x_recv
;
137 const __u64 old_x
= hctx
->ccid3hctx_x
;
140 * Handle IDLE periods: do not reduce below RFC3390 initial sending rate
141 * when idling [RFC 4342, 5.1]. See also draft-ietf-dccp-rfc3448bis.
142 * For consistency with X and X_recv, min_rate is also scaled by 2^6.
144 if (unlikely(hctx
->ccid3hctx_idle
)) {
145 min_rate
= rfc3390_initial_rate(sk
);
146 min_rate
= max(min_rate
, 2 * hctx
->ccid3hctx_x_recv
);
149 if (hctx
->ccid3hctx_p
> 0) {
151 hctx
->ccid3hctx_x
= min(((__u64
)hctx
->ccid3hctx_x_calc
) << 6,
153 hctx
->ccid3hctx_x
= max(hctx
->ccid3hctx_x
,
154 (((__u64
)hctx
->ccid3hctx_s
) << 6) /
157 } else if (timeval_delta(now
, &hctx
->ccid3hctx_t_ld
) -
158 (suseconds_t
)hctx
->ccid3hctx_rtt
>= 0) {
161 max(min(2 * hctx
->ccid3hctx_x
, min_rate
),
162 scaled_div(((__u64
)hctx
->ccid3hctx_s
) << 6,
163 hctx
->ccid3hctx_rtt
));
164 hctx
->ccid3hctx_t_ld
= *now
;
167 if (hctx
->ccid3hctx_x
!= old_x
) {
168 ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, "
169 "X_recv=%u\n", (unsigned)(old_x
>> 6),
170 (unsigned)(hctx
->ccid3hctx_x
>> 6),
171 hctx
->ccid3hctx_x_calc
,
172 (unsigned)(hctx
->ccid3hctx_x_recv
>> 6));
174 ccid3_update_send_interval(hctx
);
179 * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1)
180 * @len: DCCP packet payload size in bytes
182 static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock
*hctx
, int len
)
184 const u16 old_s
= hctx
->ccid3hctx_s
;
186 hctx
->ccid3hctx_s
= old_s
== 0 ? len
: (9 * old_s
+ len
) / 10;
188 if (hctx
->ccid3hctx_s
!= old_s
)
189 ccid3_update_send_interval(hctx
);
193 * Update Window Counter using the algorithm from [RFC 4342, 8.1].
194 * The algorithm is not applicable if RTT < 4 microseconds.
196 static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock
*hctx
,
202 if (unlikely(hctx
->ccid3hctx_rtt
< 4)) /* avoid divide-by-zero */
205 delta
= timeval_delta(now
, &hctx
->ccid3hctx_t_last_win_count
);
206 DCCP_BUG_ON(delta
< 0);
208 quarter_rtts
= (u32
)delta
/ (hctx
->ccid3hctx_rtt
/ 4);
210 if (quarter_rtts
> 0) {
211 hctx
->ccid3hctx_t_last_win_count
= *now
;
212 hctx
->ccid3hctx_last_win_count
+= min_t(u32
, quarter_rtts
, 5);
213 hctx
->ccid3hctx_last_win_count
&= 0xF; /* mod 16 */
215 ccid3_pr_debug("now at %#X\n", hctx
->ccid3hctx_last_win_count
);
219 static void ccid3_hc_tx_no_feedback_timer(unsigned long data
)
221 struct sock
*sk
= (struct sock
*)data
;
222 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
224 unsigned long t_nfb
= USEC_PER_SEC
/ 5;
227 if (sock_owned_by_user(sk
)) {
228 /* Try again later. */
229 /* XXX: set some sensible MIB */
233 ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk
), sk
,
234 ccid3_tx_state_name(hctx
->ccid3hctx_state
));
236 hctx
->ccid3hctx_idle
= 1;
238 switch (hctx
->ccid3hctx_state
) {
239 case TFRC_SSTATE_NO_FBACK
:
240 /* RFC 3448, 4.4: Halve send rate directly */
241 hctx
->ccid3hctx_x
= max(hctx
->ccid3hctx_x
/ 2,
242 (((__u64
)hctx
->ccid3hctx_s
) << 6) /
245 ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u "
246 "bytes/s\n", dccp_role(sk
), sk
,
247 ccid3_tx_state_name(hctx
->ccid3hctx_state
),
248 (unsigned)(hctx
->ccid3hctx_x
>> 6));
249 /* The value of R is still undefined and so we can not recompute
250 * the timout value. Keep initial value as per [RFC 4342, 5]. */
251 t_nfb
= TFRC_INITIAL_TIMEOUT
;
252 ccid3_update_send_interval(hctx
);
254 case TFRC_SSTATE_FBACK
:
256 * Modify the cached value of X_recv [RFC 3448, 4.4]
258 * If (p == 0 || X_calc > 2 * X_recv)
259 * X_recv = max(X_recv / 2, s / (2 * t_mbi));
261 * X_recv = X_calc / 4;
263 * Note that X_recv is scaled by 2^6 while X_calc is not
265 BUG_ON(hctx
->ccid3hctx_p
&& !hctx
->ccid3hctx_x_calc
);
267 if (hctx
->ccid3hctx_p
== 0 ||
268 (hctx
->ccid3hctx_x_calc
> (hctx
->ccid3hctx_x_recv
>> 5))) {
270 hctx
->ccid3hctx_x_recv
=
271 max(hctx
->ccid3hctx_x_recv
/ 2,
272 (((__u64
)hctx
->ccid3hctx_s
) << 6) /
275 if (hctx
->ccid3hctx_p
== 0)
276 dccp_timestamp(sk
, &now
);
278 hctx
->ccid3hctx_x_recv
= hctx
->ccid3hctx_x_calc
;
279 hctx
->ccid3hctx_x_recv
<<= 4;
281 /* Now recalculate X [RFC 3448, 4.3, step (4)] */
282 ccid3_hc_tx_update_x(sk
, &now
);
284 * Schedule no feedback timer to expire in
285 * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi)
286 * See comments in packet_recv() regarding the value of t_RTO.
288 t_nfb
= max(hctx
->ccid3hctx_t_rto
, 2 * hctx
->ccid3hctx_t_ipi
);
290 case TFRC_SSTATE_NO_SENT
:
291 DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk
), sk
);
293 case TFRC_SSTATE_TERM
:
298 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
299 jiffies
+ usecs_to_jiffies(t_nfb
));
307 * > 0: delay (in msecs) that should pass before actually sending
308 * = 0: can send immediately
309 * < 0: error condition; do not send packet
311 static int ccid3_hc_tx_send_packet(struct sock
*sk
, struct sk_buff
*skb
)
313 struct dccp_sock
*dp
= dccp_sk(sk
);
314 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
318 BUG_ON(hctx
== NULL
);
321 * This function is called only for Data and DataAck packets. Sending
322 * zero-sized Data(Ack)s is theoretically possible, but for congestion
323 * control this case is pathological - ignore it.
325 if (unlikely(skb
->len
== 0))
328 dccp_timestamp(sk
, &now
);
330 switch (hctx
->ccid3hctx_state
) {
331 case TFRC_SSTATE_NO_SENT
:
332 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
334 usecs_to_jiffies(TFRC_INITIAL_TIMEOUT
)));
335 hctx
->ccid3hctx_last_win_count
= 0;
336 hctx
->ccid3hctx_t_last_win_count
= now
;
337 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_NO_FBACK
);
339 /* Set initial sending rate X/s to 1pps (X is scaled by 2^6) */
340 hctx
->ccid3hctx_x
= hctx
->ccid3hctx_s
= skb
->len
;
341 hctx
->ccid3hctx_x
<<= 6;
343 /* First timeout, according to [RFC 3448, 4.2], is 1 second */
344 hctx
->ccid3hctx_t_ipi
= USEC_PER_SEC
;
345 /* Initial delta: minimum of 0.5 sec and t_gran/2 */
346 hctx
->ccid3hctx_delta
= TFRC_OPSYS_HALF_TIME_GRAN
;
348 /* Set t_0 for initial packet */
349 hctx
->ccid3hctx_t_nom
= now
;
351 case TFRC_SSTATE_NO_FBACK
:
352 case TFRC_SSTATE_FBACK
:
353 delay
= timeval_delta(&hctx
->ccid3hctx_t_nom
, &now
);
354 ccid3_pr_debug("delay=%ld\n", (long)delay
);
356 * Scheduling of packet transmissions [RFC 3448, 4.6]
358 * if (t_now > t_nom - delta)
359 * // send the packet now
361 * // send the packet in (t_nom - t_now) milliseconds.
363 if (delay
- (suseconds_t
)hctx
->ccid3hctx_delta
>= 0)
364 return delay
/ 1000L;
366 ccid3_hc_tx_update_win_count(hctx
, &now
);
368 case TFRC_SSTATE_TERM
:
369 DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk
), sk
);
373 /* prepare to send now (add options etc.) */
374 dp
->dccps_hc_tx_insert_options
= 1;
375 DCCP_SKB_CB(skb
)->dccpd_ccval
= hctx
->ccid3hctx_last_win_count
;
376 hctx
->ccid3hctx_idle
= 0;
378 /* set the nominal send time for the next following packet */
379 timeval_add_usecs(&hctx
->ccid3hctx_t_nom
, hctx
->ccid3hctx_t_ipi
);
384 static void ccid3_hc_tx_packet_sent(struct sock
*sk
, int more
,
387 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
389 struct dccp_tx_hist_entry
*packet
;
391 BUG_ON(hctx
== NULL
);
393 ccid3_hc_tx_update_s(hctx
, len
);
395 packet
= dccp_tx_hist_entry_new(ccid3_tx_hist
, GFP_ATOMIC
);
396 if (unlikely(packet
== NULL
)) {
397 DCCP_CRIT("packet history - out of memory!");
400 dccp_tx_hist_add_entry(&hctx
->ccid3hctx_hist
, packet
);
402 dccp_timestamp(sk
, &now
);
403 packet
->dccphtx_tstamp
= now
;
404 packet
->dccphtx_seqno
= dccp_sk(sk
)->dccps_gss
;
405 packet
->dccphtx_rtt
= hctx
->ccid3hctx_rtt
;
406 packet
->dccphtx_sent
= 1;
409 static void ccid3_hc_tx_packet_recv(struct sock
*sk
, struct sk_buff
*skb
)
411 const struct dccp_sock
*dp
= dccp_sk(sk
);
412 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
413 struct ccid3_options_received
*opt_recv
;
414 struct dccp_tx_hist_entry
*packet
;
418 suseconds_t r_sample
, t_elapsed
;
420 BUG_ON(hctx
== NULL
);
422 /* we are only interested in ACKs */
423 if (!(DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_ACK
||
424 DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_DATAACK
))
427 opt_recv
= &hctx
->ccid3hctx_options_received
;
429 switch (hctx
->ccid3hctx_state
) {
430 case TFRC_SSTATE_NO_FBACK
:
431 case TFRC_SSTATE_FBACK
:
432 /* get packet from history to look up t_recvdata */
433 packet
= dccp_tx_hist_find_entry(&hctx
->ccid3hctx_hist
,
434 DCCP_SKB_CB(skb
)->dccpd_ack_seq
);
435 if (unlikely(packet
== NULL
)) {
436 DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist "
437 "in history!\n", dccp_role(sk
), sk
,
438 (unsigned long long)DCCP_SKB_CB(skb
)->dccpd_ack_seq
,
439 dccp_packet_name(DCCP_SKB_CB(skb
)->dccpd_type
));
443 /* Update receive rate in units of 64 * bytes/second */
444 hctx
->ccid3hctx_x_recv
= opt_recv
->ccid3or_receive_rate
;
445 hctx
->ccid3hctx_x_recv
<<= 6;
447 /* Update loss event rate */
448 pinv
= opt_recv
->ccid3or_loss_event_rate
;
449 if (pinv
== ~0U || pinv
== 0) /* see RFC 4342, 8.5 */
450 hctx
->ccid3hctx_p
= 0;
451 else /* can not exceed 100% */
452 hctx
->ccid3hctx_p
= 1000000 / pinv
;
454 dccp_timestamp(sk
, &now
);
457 * Calculate new round trip sample as per [RFC 3448, 4.3] by
458 * R_sample = (now - t_recvdata) - t_elapsed
460 r_sample
= timeval_delta(&now
, &packet
->dccphtx_tstamp
);
461 t_elapsed
= dp
->dccps_options_received
.dccpor_elapsed_time
* 10;
463 DCCP_BUG_ON(r_sample
< 0);
464 if (unlikely(r_sample
<= t_elapsed
))
465 DCCP_WARN("WARNING: r_sample=%dus <= t_elapsed=%dus\n",
466 (int)r_sample
, (int)t_elapsed
);
468 r_sample
-= t_elapsed
;
469 CCID3_RTT_SANITY_CHECK(r_sample
);
471 /* Update RTT estimate by
472 * If (No feedback recv)
475 * R = q * R + (1 - q) * R_sample;
477 * q is a constant, RFC 3448 recomments 0.9
479 if (hctx
->ccid3hctx_state
== TFRC_SSTATE_NO_FBACK
) {
481 * Larger Initial Windows [RFC 4342, sec. 5]
483 hctx
->ccid3hctx_rtt
= r_sample
;
484 hctx
->ccid3hctx_x
= rfc3390_initial_rate(sk
);
485 hctx
->ccid3hctx_t_ld
= now
;
487 ccid3_update_send_interval(hctx
);
489 ccid3_pr_debug("%s(%p), s=%u, MSS=%u, "
490 "R_sample=%dus, X=%u\n", dccp_role(sk
),
491 sk
, hctx
->ccid3hctx_s
,
492 dp
->dccps_mss_cache
, (int)r_sample
,
493 (unsigned)(hctx
->ccid3hctx_x
>> 6));
495 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_FBACK
);
497 hctx
->ccid3hctx_rtt
= (9 * hctx
->ccid3hctx_rtt
+
500 /* Update sending rate (step 4 of [RFC 3448, 4.3]) */
501 if (hctx
->ccid3hctx_p
> 0)
502 hctx
->ccid3hctx_x_calc
=
503 tfrc_calc_x(hctx
->ccid3hctx_s
,
506 ccid3_hc_tx_update_x(sk
, &now
);
508 ccid3_pr_debug("%s(%p), RTT=%uus (sample=%dus), s=%u, "
509 "p=%u, X_calc=%u, X_recv=%u, X=%u\n",
511 sk
, hctx
->ccid3hctx_rtt
, (int)r_sample
,
512 hctx
->ccid3hctx_s
, hctx
->ccid3hctx_p
,
513 hctx
->ccid3hctx_x_calc
,
514 (unsigned)(hctx
->ccid3hctx_x_recv
>> 6),
515 (unsigned)(hctx
->ccid3hctx_x
>> 6));
518 /* unschedule no feedback timer */
519 sk_stop_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
);
521 /* remove all packets older than the one acked from history */
522 dccp_tx_hist_purge_older(ccid3_tx_hist
,
523 &hctx
->ccid3hctx_hist
, packet
);
525 * As we have calculated new ipi, delta, t_nom it is possible
526 * that we now can send a packet, so wake up dccp_wait_for_ccid
528 sk
->sk_write_space(sk
);
531 * Update timeout interval for the nofeedback timer.
532 * We use a configuration option to increase the lower bound.
533 * This can help avoid triggering the nofeedback timer too
534 * often ('spinning') on LANs with small RTTs.
536 hctx
->ccid3hctx_t_rto
= max_t(u32
, 4 * hctx
->ccid3hctx_rtt
,
537 CONFIG_IP_DCCP_CCID3_RTO
*
538 (USEC_PER_SEC
/1000));
540 * Schedule no feedback timer to expire in
541 * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi)
543 t_nfb
= max(hctx
->ccid3hctx_t_rto
, 2 * hctx
->ccid3hctx_t_ipi
);
545 ccid3_pr_debug("%s(%p), Scheduled no feedback timer to "
546 "expire in %lu jiffies (%luus)\n",
548 sk
, usecs_to_jiffies(t_nfb
), t_nfb
);
550 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
551 jiffies
+ usecs_to_jiffies(t_nfb
));
554 hctx
->ccid3hctx_idle
= 1;
556 case TFRC_SSTATE_NO_SENT
: /* fall through */
557 case TFRC_SSTATE_TERM
: /* ignore feedback when closing */
562 static int ccid3_hc_tx_parse_options(struct sock
*sk
, unsigned char option
,
563 unsigned char len
, u16 idx
,
564 unsigned char *value
)
567 const struct dccp_sock
*dp
= dccp_sk(sk
);
568 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
569 struct ccid3_options_received
*opt_recv
;
571 BUG_ON(hctx
== NULL
);
573 opt_recv
= &hctx
->ccid3hctx_options_received
;
575 if (opt_recv
->ccid3or_seqno
!= dp
->dccps_gsr
) {
576 opt_recv
->ccid3or_seqno
= dp
->dccps_gsr
;
577 opt_recv
->ccid3or_loss_event_rate
= ~0;
578 opt_recv
->ccid3or_loss_intervals_idx
= 0;
579 opt_recv
->ccid3or_loss_intervals_len
= 0;
580 opt_recv
->ccid3or_receive_rate
= 0;
584 case TFRC_OPT_LOSS_EVENT_RATE
:
585 if (unlikely(len
!= 4)) {
586 DCCP_WARN("%s(%p), invalid len %d "
587 "for TFRC_OPT_LOSS_EVENT_RATE\n",
588 dccp_role(sk
), sk
, len
);
591 opt_recv
->ccid3or_loss_event_rate
=
592 ntohl(*(__be32
*)value
);
593 ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n",
595 opt_recv
->ccid3or_loss_event_rate
);
598 case TFRC_OPT_LOSS_INTERVALS
:
599 opt_recv
->ccid3or_loss_intervals_idx
= idx
;
600 opt_recv
->ccid3or_loss_intervals_len
= len
;
601 ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n",
603 opt_recv
->ccid3or_loss_intervals_idx
,
604 opt_recv
->ccid3or_loss_intervals_len
);
606 case TFRC_OPT_RECEIVE_RATE
:
607 if (unlikely(len
!= 4)) {
608 DCCP_WARN("%s(%p), invalid len %d "
609 "for TFRC_OPT_RECEIVE_RATE\n",
610 dccp_role(sk
), sk
, len
);
613 opt_recv
->ccid3or_receive_rate
=
614 ntohl(*(__be32
*)value
);
615 ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n",
617 opt_recv
->ccid3or_receive_rate
);
625 static int ccid3_hc_tx_init(struct ccid
*ccid
, struct sock
*sk
)
627 struct ccid3_hc_tx_sock
*hctx
= ccid_priv(ccid
);
629 hctx
->ccid3hctx_s
= 0;
630 hctx
->ccid3hctx_rtt
= 0;
631 hctx
->ccid3hctx_state
= TFRC_SSTATE_NO_SENT
;
632 INIT_LIST_HEAD(&hctx
->ccid3hctx_hist
);
634 hctx
->ccid3hctx_no_feedback_timer
.function
=
635 ccid3_hc_tx_no_feedback_timer
;
636 hctx
->ccid3hctx_no_feedback_timer
.data
= (unsigned long)sk
;
637 init_timer(&hctx
->ccid3hctx_no_feedback_timer
);
642 static void ccid3_hc_tx_exit(struct sock
*sk
)
644 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
646 BUG_ON(hctx
== NULL
);
648 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_TERM
);
649 sk_stop_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
);
651 /* Empty packet history */
652 dccp_tx_hist_purge(ccid3_tx_hist
, &hctx
->ccid3hctx_hist
);
655 static void ccid3_hc_tx_get_info(struct sock
*sk
, struct tcp_info
*info
)
657 const struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
659 /* Listen socks doesn't have a private CCID block */
660 if (sk
->sk_state
== DCCP_LISTEN
)
663 BUG_ON(hctx
== NULL
);
665 info
->tcpi_rto
= hctx
->ccid3hctx_t_rto
;
666 info
->tcpi_rtt
= hctx
->ccid3hctx_rtt
;
669 static int ccid3_hc_tx_getsockopt(struct sock
*sk
, const int optname
, int len
,
670 u32 __user
*optval
, int __user
*optlen
)
672 const struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
675 /* Listen socks doesn't have a private CCID block */
676 if (sk
->sk_state
== DCCP_LISTEN
)
680 case DCCP_SOCKOPT_CCID_TX_INFO
:
681 if (len
< sizeof(hctx
->ccid3hctx_tfrc
))
683 len
= sizeof(hctx
->ccid3hctx_tfrc
);
684 val
= &hctx
->ccid3hctx_tfrc
;
690 if (put_user(len
, optlen
) || copy_to_user(optval
, val
, len
))
697 * Receiver Half-Connection Routines
699 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
700 static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state
)
702 static char *ccid3_rx_state_names
[] = {
703 [TFRC_RSTATE_NO_DATA
] = "NO_DATA",
704 [TFRC_RSTATE_DATA
] = "DATA",
705 [TFRC_RSTATE_TERM
] = "TERM",
708 return ccid3_rx_state_names
[state
];
712 static void ccid3_hc_rx_set_state(struct sock
*sk
,
713 enum ccid3_hc_rx_states state
)
715 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
716 enum ccid3_hc_rx_states oldstate
= hcrx
->ccid3hcrx_state
;
718 ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
719 dccp_role(sk
), sk
, ccid3_rx_state_name(oldstate
),
720 ccid3_rx_state_name(state
));
721 WARN_ON(state
== oldstate
);
722 hcrx
->ccid3hcrx_state
= state
;
725 static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock
*hcrx
, int len
)
727 if (unlikely(len
== 0)) /* don't update on empty packets (e.g. ACKs) */
728 ccid3_pr_debug("Packet payload length is 0 - not updating\n");
730 hcrx
->ccid3hcrx_s
= hcrx
->ccid3hcrx_s
== 0 ? len
:
731 (9 * hcrx
->ccid3hcrx_s
+ len
) / 10;
734 static void ccid3_hc_rx_send_feedback(struct sock
*sk
)
736 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
737 struct dccp_sock
*dp
= dccp_sk(sk
);
738 struct dccp_rx_hist_entry
*packet
;
742 ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk
), sk
);
744 dccp_timestamp(sk
, &now
);
746 switch (hcrx
->ccid3hcrx_state
) {
747 case TFRC_RSTATE_NO_DATA
:
748 hcrx
->ccid3hcrx_x_recv
= 0;
750 case TFRC_RSTATE_DATA
:
751 delta
= timeval_delta(&now
,
752 &hcrx
->ccid3hcrx_tstamp_last_feedback
);
753 DCCP_BUG_ON(delta
< 0);
754 hcrx
->ccid3hcrx_x_recv
=
755 scaled_div32(hcrx
->ccid3hcrx_bytes_recv
, delta
);
757 case TFRC_RSTATE_TERM
:
758 DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk
), sk
);
762 packet
= dccp_rx_hist_find_data_packet(&hcrx
->ccid3hcrx_hist
);
763 if (unlikely(packet
== NULL
)) {
764 DCCP_WARN("%s(%p), no data packet in history!\n",
769 hcrx
->ccid3hcrx_tstamp_last_feedback
= now
;
770 hcrx
->ccid3hcrx_ccval_last_counter
= packet
->dccphrx_ccval
;
771 hcrx
->ccid3hcrx_bytes_recv
= 0;
773 /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */
774 delta
= timeval_delta(&now
, &packet
->dccphrx_tstamp
);
775 DCCP_BUG_ON(delta
< 0);
776 hcrx
->ccid3hcrx_elapsed_time
= delta
/ 10;
778 if (hcrx
->ccid3hcrx_p
== 0)
779 hcrx
->ccid3hcrx_pinv
= ~0U; /* see RFC 4342, 8.5 */
780 else if (hcrx
->ccid3hcrx_p
> 1000000) {
781 DCCP_WARN("p (%u) > 100%%\n", hcrx
->ccid3hcrx_p
);
782 hcrx
->ccid3hcrx_pinv
= 1; /* use 100% in this case */
784 hcrx
->ccid3hcrx_pinv
= 1000000 / hcrx
->ccid3hcrx_p
;
786 dp
->dccps_hc_rx_insert_options
= 1;
790 static int ccid3_hc_rx_insert_options(struct sock
*sk
, struct sk_buff
*skb
)
792 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
795 BUG_ON(hcrx
== NULL
);
797 if (!(sk
->sk_state
== DCCP_OPEN
|| sk
->sk_state
== DCCP_PARTOPEN
))
800 DCCP_SKB_CB(skb
)->dccpd_ccval
= hcrx
->ccid3hcrx_ccval_last_counter
;
802 if (dccp_packet_without_ack(skb
))
805 x_recv
= htonl(hcrx
->ccid3hcrx_x_recv
);
806 pinv
= htonl(hcrx
->ccid3hcrx_pinv
);
808 if ((hcrx
->ccid3hcrx_elapsed_time
!= 0 &&
809 dccp_insert_option_elapsed_time(sk
, skb
,
810 hcrx
->ccid3hcrx_elapsed_time
)) ||
811 dccp_insert_option_timestamp(sk
, skb
) ||
812 dccp_insert_option(sk
, skb
, TFRC_OPT_LOSS_EVENT_RATE
,
813 &pinv
, sizeof(pinv
)) ||
814 dccp_insert_option(sk
, skb
, TFRC_OPT_RECEIVE_RATE
,
815 &x_recv
, sizeof(x_recv
)))
821 /* calculate first loss interval
823 * returns estimated loss interval in usecs */
825 static u32
ccid3_hc_rx_calc_first_li(struct sock
*sk
)
827 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
828 struct dccp_rx_hist_entry
*entry
, *next
, *tail
= NULL
;
830 suseconds_t rtt
, delta
;
831 struct timeval tstamp
= { 0, };
837 list_for_each_entry_safe(entry
, next
, &hcrx
->ccid3hcrx_hist
,
839 if (dccp_rx_hist_entry_data_packet(entry
)) {
844 tstamp
= entry
->dccphrx_tstamp
;
845 win_count
= entry
->dccphrx_ccval
;
849 interval
= win_count
- entry
->dccphrx_ccval
;
851 interval
+= TFRC_WIN_COUNT_LIMIT
;
859 if (unlikely(step
== 0)) {
860 DCCP_WARN("%s(%p), packet history has no data packets!\n",
865 if (unlikely(interval
== 0)) {
866 DCCP_WARN("%s(%p), Could not find a win_count interval > 0."
867 "Defaulting to 1\n", dccp_role(sk
), sk
);
872 DCCP_CRIT("tail is null\n");
876 delta
= timeval_delta(&tstamp
, &tail
->dccphrx_tstamp
);
877 DCCP_BUG_ON(delta
< 0);
879 rtt
= delta
* 4 / interval
;
880 ccid3_pr_debug("%s(%p), approximated RTT to %dus\n",
881 dccp_role(sk
), sk
, (int)rtt
);
884 * Determine the length of the first loss interval via inverse lookup.
885 * Assume that X_recv can be computed by the throughput equation
889 * Find some p such that f(p) = fval; return 1/p [RFC 3448, 6.3.1].
891 if (rtt
== 0) { /* would result in divide-by-zero */
892 DCCP_WARN("RTT==0\n");
896 dccp_timestamp(sk
, &tstamp
);
897 delta
= timeval_delta(&tstamp
, &hcrx
->ccid3hcrx_tstamp_last_feedback
);
898 DCCP_BUG_ON(delta
<= 0);
900 x_recv
= scaled_div32(hcrx
->ccid3hcrx_bytes_recv
, delta
);
901 if (x_recv
== 0) { /* would also trigger divide-by-zero */
902 DCCP_WARN("X_recv==0\n");
903 if ((x_recv
= hcrx
->ccid3hcrx_x_recv
) == 0) {
904 DCCP_BUG("stored value of X_recv is zero");
909 fval
= scaled_div(hcrx
->ccid3hcrx_s
, rtt
);
910 fval
= scaled_div32(fval
, x_recv
);
911 p
= tfrc_calc_x_reverse_lookup(fval
);
913 ccid3_pr_debug("%s(%p), receive rate=%u bytes/s, implied "
914 "loss rate=%u\n", dccp_role(sk
), sk
, x_recv
, p
);
922 static void ccid3_hc_rx_update_li(struct sock
*sk
, u64 seq_loss
, u8 win_loss
)
924 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
925 struct dccp_li_hist_entry
*head
;
928 if (list_empty(&hcrx
->ccid3hcrx_li_hist
)) {
929 if (!dccp_li_hist_interval_new(ccid3_li_hist
,
930 &hcrx
->ccid3hcrx_li_hist
, seq_loss
, win_loss
))
933 head
= list_entry(hcrx
->ccid3hcrx_li_hist
.next
,
934 struct dccp_li_hist_entry
, dccplih_node
);
935 head
->dccplih_interval
= ccid3_hc_rx_calc_first_li(sk
);
937 struct dccp_li_hist_entry
*entry
;
938 struct list_head
*tail
;
940 head
= list_entry(hcrx
->ccid3hcrx_li_hist
.next
,
941 struct dccp_li_hist_entry
, dccplih_node
);
942 /* FIXME win count check removed as was wrong */
943 /* should make this check with receive history */
944 /* and compare there as per section 10.2 of RFC4342 */
946 /* new loss event detected */
947 /* calculate last interval length */
948 seq_temp
= dccp_delta_seqno(head
->dccplih_seqno
, seq_loss
);
949 entry
= dccp_li_hist_entry_new(ccid3_li_hist
, GFP_ATOMIC
);
952 DCCP_BUG("out of memory - can not allocate entry");
956 list_add(&entry
->dccplih_node
, &hcrx
->ccid3hcrx_li_hist
);
958 tail
= hcrx
->ccid3hcrx_li_hist
.prev
;
960 kmem_cache_free(ccid3_li_hist
->dccplih_slab
, tail
);
962 /* Create the newest interval */
963 entry
->dccplih_seqno
= seq_loss
;
964 entry
->dccplih_interval
= seq_temp
;
965 entry
->dccplih_win_count
= win_loss
;
969 static int ccid3_hc_rx_detect_loss(struct sock
*sk
,
970 struct dccp_rx_hist_entry
*packet
)
972 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
973 struct dccp_rx_hist_entry
*rx_hist
=
974 dccp_rx_hist_head(&hcrx
->ccid3hcrx_hist
);
975 u64 seqno
= packet
->dccphrx_seqno
;
981 tmp_seqno
= hcrx
->ccid3hcrx_seqno_nonloss
;
984 follows48(packet
->dccphrx_seqno
, hcrx
->ccid3hcrx_seqno_nonloss
)) {
985 hcrx
->ccid3hcrx_seqno_nonloss
= seqno
;
986 hcrx
->ccid3hcrx_ccval_nonloss
= packet
->dccphrx_ccval
;
991 while (dccp_delta_seqno(hcrx
->ccid3hcrx_seqno_nonloss
, seqno
)
992 > TFRC_RECV_NUM_LATE_LOSS
) {
994 ccid3_hc_rx_update_li(sk
, hcrx
->ccid3hcrx_seqno_nonloss
,
995 hcrx
->ccid3hcrx_ccval_nonloss
);
996 tmp_seqno
= hcrx
->ccid3hcrx_seqno_nonloss
;
997 dccp_inc_seqno(&tmp_seqno
);
998 hcrx
->ccid3hcrx_seqno_nonloss
= tmp_seqno
;
999 dccp_inc_seqno(&tmp_seqno
);
1000 while (dccp_rx_hist_find_entry(&hcrx
->ccid3hcrx_hist
,
1001 tmp_seqno
, &ccval
)) {
1002 hcrx
->ccid3hcrx_seqno_nonloss
= tmp_seqno
;
1003 hcrx
->ccid3hcrx_ccval_nonloss
= ccval
;
1004 dccp_inc_seqno(&tmp_seqno
);
1008 /* FIXME - this code could be simplified with above while */
1009 /* but works at moment */
1010 if (follows48(packet
->dccphrx_seqno
, hcrx
->ccid3hcrx_seqno_nonloss
)) {
1011 hcrx
->ccid3hcrx_seqno_nonloss
= seqno
;
1012 hcrx
->ccid3hcrx_ccval_nonloss
= packet
->dccphrx_ccval
;
1016 dccp_rx_hist_add_packet(ccid3_rx_hist
, &hcrx
->ccid3hcrx_hist
,
1017 &hcrx
->ccid3hcrx_li_hist
, packet
,
1018 hcrx
->ccid3hcrx_seqno_nonloss
);
1022 static void ccid3_hc_rx_packet_recv(struct sock
*sk
, struct sk_buff
*skb
)
1024 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1025 const struct dccp_options_received
*opt_recv
;
1026 struct dccp_rx_hist_entry
*packet
;
1028 u32 p_prev
, rtt_prev
;
1029 suseconds_t r_sample
, t_elapsed
;
1030 int loss
, payload_size
;
1032 BUG_ON(hcrx
== NULL
);
1034 opt_recv
= &dccp_sk(sk
)->dccps_options_received
;
1036 switch (DCCP_SKB_CB(skb
)->dccpd_type
) {
1038 if (hcrx
->ccid3hcrx_state
== TFRC_RSTATE_NO_DATA
)
1040 case DCCP_PKT_DATAACK
:
1041 if (opt_recv
->dccpor_timestamp_echo
== 0)
1043 rtt_prev
= hcrx
->ccid3hcrx_rtt
;
1044 dccp_timestamp(sk
, &now
);
1045 timeval_sub_usecs(&now
, opt_recv
->dccpor_timestamp_echo
* 10);
1046 r_sample
= timeval_usecs(&now
);
1047 t_elapsed
= opt_recv
->dccpor_elapsed_time
* 10;
1049 DCCP_BUG_ON(r_sample
< 0);
1050 if (unlikely(r_sample
<= t_elapsed
))
1051 DCCP_WARN("r_sample=%ldus, t_elapsed=%ldus\n",
1052 (long)r_sample
, (long)t_elapsed
);
1054 r_sample
-= t_elapsed
;
1055 CCID3_RTT_SANITY_CHECK(r_sample
);
1057 if (hcrx
->ccid3hcrx_state
== TFRC_RSTATE_NO_DATA
)
1058 hcrx
->ccid3hcrx_rtt
= r_sample
;
1060 hcrx
->ccid3hcrx_rtt
= (hcrx
->ccid3hcrx_rtt
* 9) / 10 +
1063 if (rtt_prev
!= hcrx
->ccid3hcrx_rtt
)
1064 ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n",
1065 dccp_role(sk
), sk
, hcrx
->ccid3hcrx_rtt
,
1066 opt_recv
->dccpor_elapsed_time
);
1070 default: /* We're not interested in other packet types, move along */
1074 packet
= dccp_rx_hist_entry_new(ccid3_rx_hist
, sk
, opt_recv
->dccpor_ndp
,
1076 if (unlikely(packet
== NULL
)) {
1077 DCCP_WARN("%s(%p), Not enough mem to add rx packet "
1078 "to history, consider it lost!\n", dccp_role(sk
), sk
);
1082 loss
= ccid3_hc_rx_detect_loss(sk
, packet
);
1084 if (DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_ACK
)
1087 payload_size
= skb
->len
- dccp_hdr(skb
)->dccph_doff
* 4;
1088 ccid3_hc_rx_update_s(hcrx
, payload_size
);
1090 switch (hcrx
->ccid3hcrx_state
) {
1091 case TFRC_RSTATE_NO_DATA
:
1092 ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial "
1093 "feedback\n", dccp_role(sk
), sk
,
1094 dccp_state_name(sk
->sk_state
), skb
);
1095 ccid3_hc_rx_send_feedback(sk
);
1096 ccid3_hc_rx_set_state(sk
, TFRC_RSTATE_DATA
);
1098 case TFRC_RSTATE_DATA
:
1099 hcrx
->ccid3hcrx_bytes_recv
+= payload_size
;
1103 dccp_timestamp(sk
, &now
);
1104 if ((timeval_delta(&now
, &hcrx
->ccid3hcrx_tstamp_last_ack
) -
1105 (suseconds_t
)hcrx
->ccid3hcrx_rtt
) >= 0) {
1106 hcrx
->ccid3hcrx_tstamp_last_ack
= now
;
1107 ccid3_hc_rx_send_feedback(sk
);
1110 case TFRC_RSTATE_TERM
:
1111 DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk
), sk
);
1115 /* Dealing with packet loss */
1116 ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n",
1117 dccp_role(sk
), sk
, dccp_state_name(sk
->sk_state
));
1119 p_prev
= hcrx
->ccid3hcrx_p
;
1121 /* Calculate loss event rate */
1122 if (!list_empty(&hcrx
->ccid3hcrx_li_hist
)) {
1123 u32 i_mean
= dccp_li_hist_calc_i_mean(&hcrx
->ccid3hcrx_li_hist
);
1125 /* Scaling up by 1000000 as fixed decimal */
1127 hcrx
->ccid3hcrx_p
= 1000000 / i_mean
;
1129 DCCP_BUG("empty loss history");
1131 if (hcrx
->ccid3hcrx_p
> p_prev
) {
1132 ccid3_hc_rx_send_feedback(sk
);
1137 static int ccid3_hc_rx_init(struct ccid
*ccid
, struct sock
*sk
)
1139 struct ccid3_hc_rx_sock
*hcrx
= ccid_priv(ccid
);
1141 ccid3_pr_debug("entry\n");
1143 hcrx
->ccid3hcrx_state
= TFRC_RSTATE_NO_DATA
;
1144 INIT_LIST_HEAD(&hcrx
->ccid3hcrx_hist
);
1145 INIT_LIST_HEAD(&hcrx
->ccid3hcrx_li_hist
);
1146 dccp_timestamp(sk
, &hcrx
->ccid3hcrx_tstamp_last_ack
);
1147 hcrx
->ccid3hcrx_tstamp_last_feedback
= hcrx
->ccid3hcrx_tstamp_last_ack
;
1148 hcrx
->ccid3hcrx_s
= 0;
1149 hcrx
->ccid3hcrx_rtt
= 0;
1153 static void ccid3_hc_rx_exit(struct sock
*sk
)
1155 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1157 BUG_ON(hcrx
== NULL
);
1159 ccid3_hc_rx_set_state(sk
, TFRC_RSTATE_TERM
);
1161 /* Empty packet history */
1162 dccp_rx_hist_purge(ccid3_rx_hist
, &hcrx
->ccid3hcrx_hist
);
1164 /* Empty loss interval history */
1165 dccp_li_hist_purge(ccid3_li_hist
, &hcrx
->ccid3hcrx_li_hist
);
1168 static void ccid3_hc_rx_get_info(struct sock
*sk
, struct tcp_info
*info
)
1170 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1172 /* Listen socks doesn't have a private CCID block */
1173 if (sk
->sk_state
== DCCP_LISTEN
)
1176 BUG_ON(hcrx
== NULL
);
1178 info
->tcpi_ca_state
= hcrx
->ccid3hcrx_state
;
1179 info
->tcpi_options
|= TCPI_OPT_TIMESTAMPS
;
1180 info
->tcpi_rcv_rtt
= hcrx
->ccid3hcrx_rtt
;
1183 static int ccid3_hc_rx_getsockopt(struct sock
*sk
, const int optname
, int len
,
1184 u32 __user
*optval
, int __user
*optlen
)
1186 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1189 /* Listen socks doesn't have a private CCID block */
1190 if (sk
->sk_state
== DCCP_LISTEN
)
1194 case DCCP_SOCKOPT_CCID_RX_INFO
:
1195 if (len
< sizeof(hcrx
->ccid3hcrx_tfrc
))
1197 len
= sizeof(hcrx
->ccid3hcrx_tfrc
);
1198 val
= &hcrx
->ccid3hcrx_tfrc
;
1201 return -ENOPROTOOPT
;
1204 if (put_user(len
, optlen
) || copy_to_user(optval
, val
, len
))
1210 static struct ccid_operations ccid3
= {
1211 .ccid_id
= DCCPC_CCID3
,
1212 .ccid_name
= "ccid3",
1213 .ccid_owner
= THIS_MODULE
,
1214 .ccid_hc_tx_obj_size
= sizeof(struct ccid3_hc_tx_sock
),
1215 .ccid_hc_tx_init
= ccid3_hc_tx_init
,
1216 .ccid_hc_tx_exit
= ccid3_hc_tx_exit
,
1217 .ccid_hc_tx_send_packet
= ccid3_hc_tx_send_packet
,
1218 .ccid_hc_tx_packet_sent
= ccid3_hc_tx_packet_sent
,
1219 .ccid_hc_tx_packet_recv
= ccid3_hc_tx_packet_recv
,
1220 .ccid_hc_tx_parse_options
= ccid3_hc_tx_parse_options
,
1221 .ccid_hc_rx_obj_size
= sizeof(struct ccid3_hc_rx_sock
),
1222 .ccid_hc_rx_init
= ccid3_hc_rx_init
,
1223 .ccid_hc_rx_exit
= ccid3_hc_rx_exit
,
1224 .ccid_hc_rx_insert_options
= ccid3_hc_rx_insert_options
,
1225 .ccid_hc_rx_packet_recv
= ccid3_hc_rx_packet_recv
,
1226 .ccid_hc_rx_get_info
= ccid3_hc_rx_get_info
,
1227 .ccid_hc_tx_get_info
= ccid3_hc_tx_get_info
,
1228 .ccid_hc_rx_getsockopt
= ccid3_hc_rx_getsockopt
,
1229 .ccid_hc_tx_getsockopt
= ccid3_hc_tx_getsockopt
,
1232 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
1233 module_param(ccid3_debug
, int, 0444);
1234 MODULE_PARM_DESC(ccid3_debug
, "Enable debug messages");
1237 static __init
int ccid3_module_init(void)
1241 ccid3_rx_hist
= dccp_rx_hist_new("ccid3");
1242 if (ccid3_rx_hist
== NULL
)
1245 ccid3_tx_hist
= dccp_tx_hist_new("ccid3");
1246 if (ccid3_tx_hist
== NULL
)
1249 ccid3_li_hist
= dccp_li_hist_new("ccid3");
1250 if (ccid3_li_hist
== NULL
)
1253 rc
= ccid_register(&ccid3
);
1255 goto out_free_loss_interval_history
;
1259 out_free_loss_interval_history
:
1260 dccp_li_hist_delete(ccid3_li_hist
);
1261 ccid3_li_hist
= NULL
;
1263 dccp_tx_hist_delete(ccid3_tx_hist
);
1264 ccid3_tx_hist
= NULL
;
1266 dccp_rx_hist_delete(ccid3_rx_hist
);
1267 ccid3_rx_hist
= NULL
;
1270 module_init(ccid3_module_init
);
1272 static __exit
void ccid3_module_exit(void)
1274 ccid_unregister(&ccid3
);
1276 if (ccid3_tx_hist
!= NULL
) {
1277 dccp_tx_hist_delete(ccid3_tx_hist
);
1278 ccid3_tx_hist
= NULL
;
1280 if (ccid3_rx_hist
!= NULL
) {
1281 dccp_rx_hist_delete(ccid3_rx_hist
);
1282 ccid3_rx_hist
= NULL
;
1284 if (ccid3_li_hist
!= NULL
) {
1285 dccp_li_hist_delete(ccid3_li_hist
);
1286 ccid3_li_hist
= NULL
;
1289 module_exit(ccid3_module_exit
);
1291 MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, "
1292 "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
1293 MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID");
1294 MODULE_LICENSE("GPL");
1295 MODULE_ALIAS("net-dccp-ccid-3");