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
;
338 /* Set t_0 for initial packet */
339 hctx
->ccid3hctx_t_nom
= now
;
341 hctx
->ccid3hctx_s
= skb
->len
;
344 * Use initial RTT sample when available: recommended by erratum
345 * to RFC 4342. This implements the initialisation procedure of
346 * draft rfc3448bis, section 4.2. Remember, X is scaled by 2^6.
348 if (dp
->dccps_syn_rtt
) {
349 ccid3_pr_debug("SYN RTT = %uus\n", dp
->dccps_syn_rtt
);
350 hctx
->ccid3hctx_rtt
= dp
->dccps_syn_rtt
;
351 hctx
->ccid3hctx_x
= rfc3390_initial_rate(sk
);
352 hctx
->ccid3hctx_t_ld
= now
;
354 /* Sender does not have RTT sample: X = MSS/second */
355 hctx
->ccid3hctx_x
= dp
->dccps_mss_cache
;
356 hctx
->ccid3hctx_x
<<= 6;
358 ccid3_update_send_interval(hctx
);
360 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_NO_FBACK
);
362 case TFRC_SSTATE_NO_FBACK
:
363 case TFRC_SSTATE_FBACK
:
364 delay
= timeval_delta(&hctx
->ccid3hctx_t_nom
, &now
);
365 ccid3_pr_debug("delay=%ld\n", (long)delay
);
367 * Scheduling of packet transmissions [RFC 3448, 4.6]
369 * if (t_now > t_nom - delta)
370 * // send the packet now
372 * // send the packet in (t_nom - t_now) milliseconds.
374 if (delay
- (suseconds_t
)hctx
->ccid3hctx_delta
>= 0)
375 return delay
/ 1000L;
377 ccid3_hc_tx_update_win_count(hctx
, &now
);
379 case TFRC_SSTATE_TERM
:
380 DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk
), sk
);
384 /* prepare to send now (add options etc.) */
385 dp
->dccps_hc_tx_insert_options
= 1;
386 DCCP_SKB_CB(skb
)->dccpd_ccval
= hctx
->ccid3hctx_last_win_count
;
387 hctx
->ccid3hctx_idle
= 0;
389 /* set the nominal send time for the next following packet */
390 timeval_add_usecs(&hctx
->ccid3hctx_t_nom
, hctx
->ccid3hctx_t_ipi
);
395 static void ccid3_hc_tx_packet_sent(struct sock
*sk
, int more
,
398 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
400 struct dccp_tx_hist_entry
*packet
;
402 BUG_ON(hctx
== NULL
);
404 ccid3_hc_tx_update_s(hctx
, len
);
406 packet
= dccp_tx_hist_entry_new(ccid3_tx_hist
, GFP_ATOMIC
);
407 if (unlikely(packet
== NULL
)) {
408 DCCP_CRIT("packet history - out of memory!");
411 dccp_tx_hist_add_entry(&hctx
->ccid3hctx_hist
, packet
);
413 dccp_timestamp(sk
, &now
);
414 packet
->dccphtx_tstamp
= now
;
415 packet
->dccphtx_seqno
= dccp_sk(sk
)->dccps_gss
;
416 packet
->dccphtx_rtt
= hctx
->ccid3hctx_rtt
;
417 packet
->dccphtx_sent
= 1;
420 static void ccid3_hc_tx_packet_recv(struct sock
*sk
, struct sk_buff
*skb
)
422 const struct dccp_sock
*dp
= dccp_sk(sk
);
423 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
424 struct ccid3_options_received
*opt_recv
;
425 struct dccp_tx_hist_entry
*packet
;
430 BUG_ON(hctx
== NULL
);
432 /* we are only interested in ACKs */
433 if (!(DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_ACK
||
434 DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_DATAACK
))
437 opt_recv
= &hctx
->ccid3hctx_options_received
;
439 switch (hctx
->ccid3hctx_state
) {
440 case TFRC_SSTATE_NO_FBACK
:
441 case TFRC_SSTATE_FBACK
:
442 /* get packet from history to look up t_recvdata */
443 packet
= dccp_tx_hist_find_entry(&hctx
->ccid3hctx_hist
,
444 DCCP_SKB_CB(skb
)->dccpd_ack_seq
);
445 if (unlikely(packet
== NULL
)) {
446 DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist "
447 "in history!\n", dccp_role(sk
), sk
,
448 (unsigned long long)DCCP_SKB_CB(skb
)->dccpd_ack_seq
,
449 dccp_packet_name(DCCP_SKB_CB(skb
)->dccpd_type
));
453 /* Update receive rate in units of 64 * bytes/second */
454 hctx
->ccid3hctx_x_recv
= opt_recv
->ccid3or_receive_rate
;
455 hctx
->ccid3hctx_x_recv
<<= 6;
457 /* Update loss event rate */
458 pinv
= opt_recv
->ccid3or_loss_event_rate
;
459 if (pinv
== ~0U || pinv
== 0) /* see RFC 4342, 8.5 */
460 hctx
->ccid3hctx_p
= 0;
461 else /* can not exceed 100% */
462 hctx
->ccid3hctx_p
= 1000000 / pinv
;
464 dccp_timestamp(sk
, &now
);
467 * Calculate new round trip sample as per [RFC 3448, 4.3] by
468 * R_sample = (now - t_recvdata) - t_elapsed
470 r_sample
= dccp_sample_rtt(sk
, &now
, &packet
->dccphtx_tstamp
);
473 * Update RTT estimate by
474 * If (No feedback recv)
477 * R = q * R + (1 - q) * R_sample;
479 * q is a constant, RFC 3448 recomments 0.9
481 if (hctx
->ccid3hctx_state
== TFRC_SSTATE_NO_FBACK
) {
483 * Larger Initial Windows [RFC 4342, sec. 5]
485 hctx
->ccid3hctx_rtt
= r_sample
;
486 hctx
->ccid3hctx_x
= rfc3390_initial_rate(sk
);
487 hctx
->ccid3hctx_t_ld
= now
;
489 ccid3_update_send_interval(hctx
);
491 ccid3_pr_debug("%s(%p), s=%u, MSS=%u, "
492 "R_sample=%uus, X=%u\n", dccp_role(sk
),
493 sk
, hctx
->ccid3hctx_s
,
494 dp
->dccps_mss_cache
, r_sample
,
495 (unsigned)(hctx
->ccid3hctx_x
>> 6));
497 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_FBACK
);
499 hctx
->ccid3hctx_rtt
= (9 * hctx
->ccid3hctx_rtt
+
502 /* Update sending rate (step 4 of [RFC 3448, 4.3]) */
503 if (hctx
->ccid3hctx_p
> 0)
504 hctx
->ccid3hctx_x_calc
=
505 tfrc_calc_x(hctx
->ccid3hctx_s
,
508 ccid3_hc_tx_update_x(sk
, &now
);
510 ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, "
511 "p=%u, X_calc=%u, X_recv=%u, X=%u\n",
513 sk
, hctx
->ccid3hctx_rtt
, r_sample
,
514 hctx
->ccid3hctx_s
, hctx
->ccid3hctx_p
,
515 hctx
->ccid3hctx_x_calc
,
516 (unsigned)(hctx
->ccid3hctx_x_recv
>> 6),
517 (unsigned)(hctx
->ccid3hctx_x
>> 6));
520 /* unschedule no feedback timer */
521 sk_stop_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
);
523 /* remove all packets older than the one acked from history */
524 dccp_tx_hist_purge_older(ccid3_tx_hist
,
525 &hctx
->ccid3hctx_hist
, packet
);
527 * As we have calculated new ipi, delta, t_nom it is possible
528 * that we now can send a packet, so wake up dccp_wait_for_ccid
530 sk
->sk_write_space(sk
);
533 * Update timeout interval for the nofeedback timer.
534 * We use a configuration option to increase the lower bound.
535 * This can help avoid triggering the nofeedback timer too
536 * often ('spinning') on LANs with small RTTs.
538 hctx
->ccid3hctx_t_rto
= max_t(u32
, 4 * hctx
->ccid3hctx_rtt
,
539 CONFIG_IP_DCCP_CCID3_RTO
*
540 (USEC_PER_SEC
/1000));
542 * Schedule no feedback timer to expire in
543 * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi)
545 t_nfb
= max(hctx
->ccid3hctx_t_rto
, 2 * hctx
->ccid3hctx_t_ipi
);
547 ccid3_pr_debug("%s(%p), Scheduled no feedback timer to "
548 "expire in %lu jiffies (%luus)\n",
550 sk
, usecs_to_jiffies(t_nfb
), t_nfb
);
552 sk_reset_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
,
553 jiffies
+ usecs_to_jiffies(t_nfb
));
556 hctx
->ccid3hctx_idle
= 1;
558 case TFRC_SSTATE_NO_SENT
: /* fall through */
559 case TFRC_SSTATE_TERM
: /* ignore feedback when closing */
564 static int ccid3_hc_tx_parse_options(struct sock
*sk
, unsigned char option
,
565 unsigned char len
, u16 idx
,
566 unsigned char *value
)
569 const struct dccp_sock
*dp
= dccp_sk(sk
);
570 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
571 struct ccid3_options_received
*opt_recv
;
573 BUG_ON(hctx
== NULL
);
575 opt_recv
= &hctx
->ccid3hctx_options_received
;
577 if (opt_recv
->ccid3or_seqno
!= dp
->dccps_gsr
) {
578 opt_recv
->ccid3or_seqno
= dp
->dccps_gsr
;
579 opt_recv
->ccid3or_loss_event_rate
= ~0;
580 opt_recv
->ccid3or_loss_intervals_idx
= 0;
581 opt_recv
->ccid3or_loss_intervals_len
= 0;
582 opt_recv
->ccid3or_receive_rate
= 0;
586 case TFRC_OPT_LOSS_EVENT_RATE
:
587 if (unlikely(len
!= 4)) {
588 DCCP_WARN("%s(%p), invalid len %d "
589 "for TFRC_OPT_LOSS_EVENT_RATE\n",
590 dccp_role(sk
), sk
, len
);
593 opt_recv
->ccid3or_loss_event_rate
=
594 ntohl(*(__be32
*)value
);
595 ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n",
597 opt_recv
->ccid3or_loss_event_rate
);
600 case TFRC_OPT_LOSS_INTERVALS
:
601 opt_recv
->ccid3or_loss_intervals_idx
= idx
;
602 opt_recv
->ccid3or_loss_intervals_len
= len
;
603 ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n",
605 opt_recv
->ccid3or_loss_intervals_idx
,
606 opt_recv
->ccid3or_loss_intervals_len
);
608 case TFRC_OPT_RECEIVE_RATE
:
609 if (unlikely(len
!= 4)) {
610 DCCP_WARN("%s(%p), invalid len %d "
611 "for TFRC_OPT_RECEIVE_RATE\n",
612 dccp_role(sk
), sk
, len
);
615 opt_recv
->ccid3or_receive_rate
=
616 ntohl(*(__be32
*)value
);
617 ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n",
619 opt_recv
->ccid3or_receive_rate
);
627 static int ccid3_hc_tx_init(struct ccid
*ccid
, struct sock
*sk
)
629 struct ccid3_hc_tx_sock
*hctx
= ccid_priv(ccid
);
631 hctx
->ccid3hctx_s
= 0;
632 hctx
->ccid3hctx_rtt
= 0;
633 hctx
->ccid3hctx_state
= TFRC_SSTATE_NO_SENT
;
634 INIT_LIST_HEAD(&hctx
->ccid3hctx_hist
);
636 hctx
->ccid3hctx_no_feedback_timer
.function
=
637 ccid3_hc_tx_no_feedback_timer
;
638 hctx
->ccid3hctx_no_feedback_timer
.data
= (unsigned long)sk
;
639 init_timer(&hctx
->ccid3hctx_no_feedback_timer
);
644 static void ccid3_hc_tx_exit(struct sock
*sk
)
646 struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
648 BUG_ON(hctx
== NULL
);
650 ccid3_hc_tx_set_state(sk
, TFRC_SSTATE_TERM
);
651 sk_stop_timer(sk
, &hctx
->ccid3hctx_no_feedback_timer
);
653 /* Empty packet history */
654 dccp_tx_hist_purge(ccid3_tx_hist
, &hctx
->ccid3hctx_hist
);
657 static void ccid3_hc_tx_get_info(struct sock
*sk
, struct tcp_info
*info
)
659 const struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
661 /* Listen socks doesn't have a private CCID block */
662 if (sk
->sk_state
== DCCP_LISTEN
)
665 BUG_ON(hctx
== NULL
);
667 info
->tcpi_rto
= hctx
->ccid3hctx_t_rto
;
668 info
->tcpi_rtt
= hctx
->ccid3hctx_rtt
;
671 static int ccid3_hc_tx_getsockopt(struct sock
*sk
, const int optname
, int len
,
672 u32 __user
*optval
, int __user
*optlen
)
674 const struct ccid3_hc_tx_sock
*hctx
= ccid3_hc_tx_sk(sk
);
677 /* Listen socks doesn't have a private CCID block */
678 if (sk
->sk_state
== DCCP_LISTEN
)
682 case DCCP_SOCKOPT_CCID_TX_INFO
:
683 if (len
< sizeof(hctx
->ccid3hctx_tfrc
))
685 len
= sizeof(hctx
->ccid3hctx_tfrc
);
686 val
= &hctx
->ccid3hctx_tfrc
;
692 if (put_user(len
, optlen
) || copy_to_user(optval
, val
, len
))
699 * Receiver Half-Connection Routines
701 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
702 static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state
)
704 static char *ccid3_rx_state_names
[] = {
705 [TFRC_RSTATE_NO_DATA
] = "NO_DATA",
706 [TFRC_RSTATE_DATA
] = "DATA",
707 [TFRC_RSTATE_TERM
] = "TERM",
710 return ccid3_rx_state_names
[state
];
714 static void ccid3_hc_rx_set_state(struct sock
*sk
,
715 enum ccid3_hc_rx_states state
)
717 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
718 enum ccid3_hc_rx_states oldstate
= hcrx
->ccid3hcrx_state
;
720 ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
721 dccp_role(sk
), sk
, ccid3_rx_state_name(oldstate
),
722 ccid3_rx_state_name(state
));
723 WARN_ON(state
== oldstate
);
724 hcrx
->ccid3hcrx_state
= state
;
727 static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock
*hcrx
, int len
)
729 if (unlikely(len
== 0)) /* don't update on empty packets (e.g. ACKs) */
730 ccid3_pr_debug("Packet payload length is 0 - not updating\n");
732 hcrx
->ccid3hcrx_s
= hcrx
->ccid3hcrx_s
== 0 ? len
:
733 (9 * hcrx
->ccid3hcrx_s
+ len
) / 10;
736 static void ccid3_hc_rx_send_feedback(struct sock
*sk
)
738 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
739 struct dccp_sock
*dp
= dccp_sk(sk
);
740 struct dccp_rx_hist_entry
*packet
;
744 ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk
), sk
);
746 dccp_timestamp(sk
, &now
);
748 switch (hcrx
->ccid3hcrx_state
) {
749 case TFRC_RSTATE_NO_DATA
:
750 hcrx
->ccid3hcrx_x_recv
= 0;
752 case TFRC_RSTATE_DATA
:
753 delta
= timeval_delta(&now
,
754 &hcrx
->ccid3hcrx_tstamp_last_feedback
);
755 DCCP_BUG_ON(delta
< 0);
756 hcrx
->ccid3hcrx_x_recv
=
757 scaled_div32(hcrx
->ccid3hcrx_bytes_recv
, delta
);
759 case TFRC_RSTATE_TERM
:
760 DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk
), sk
);
764 packet
= dccp_rx_hist_find_data_packet(&hcrx
->ccid3hcrx_hist
);
765 if (unlikely(packet
== NULL
)) {
766 DCCP_WARN("%s(%p), no data packet in history!\n",
771 hcrx
->ccid3hcrx_tstamp_last_feedback
= now
;
772 hcrx
->ccid3hcrx_ccval_last_counter
= packet
->dccphrx_ccval
;
773 hcrx
->ccid3hcrx_bytes_recv
= 0;
775 /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */
776 delta
= timeval_delta(&now
, &packet
->dccphrx_tstamp
);
777 DCCP_BUG_ON(delta
< 0);
778 hcrx
->ccid3hcrx_elapsed_time
= delta
/ 10;
780 if (hcrx
->ccid3hcrx_p
== 0)
781 hcrx
->ccid3hcrx_pinv
= ~0U; /* see RFC 4342, 8.5 */
782 else if (hcrx
->ccid3hcrx_p
> 1000000) {
783 DCCP_WARN("p (%u) > 100%%\n", hcrx
->ccid3hcrx_p
);
784 hcrx
->ccid3hcrx_pinv
= 1; /* use 100% in this case */
786 hcrx
->ccid3hcrx_pinv
= 1000000 / hcrx
->ccid3hcrx_p
;
788 dp
->dccps_hc_rx_insert_options
= 1;
792 static int ccid3_hc_rx_insert_options(struct sock
*sk
, struct sk_buff
*skb
)
794 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
797 BUG_ON(hcrx
== NULL
);
799 if (!(sk
->sk_state
== DCCP_OPEN
|| sk
->sk_state
== DCCP_PARTOPEN
))
802 DCCP_SKB_CB(skb
)->dccpd_ccval
= hcrx
->ccid3hcrx_ccval_last_counter
;
804 if (dccp_packet_without_ack(skb
))
807 x_recv
= htonl(hcrx
->ccid3hcrx_x_recv
);
808 pinv
= htonl(hcrx
->ccid3hcrx_pinv
);
810 if ((hcrx
->ccid3hcrx_elapsed_time
!= 0 &&
811 dccp_insert_option_elapsed_time(sk
, skb
,
812 hcrx
->ccid3hcrx_elapsed_time
)) ||
813 dccp_insert_option_timestamp(sk
, skb
) ||
814 dccp_insert_option(sk
, skb
, TFRC_OPT_LOSS_EVENT_RATE
,
815 &pinv
, sizeof(pinv
)) ||
816 dccp_insert_option(sk
, skb
, TFRC_OPT_RECEIVE_RATE
,
817 &x_recv
, sizeof(x_recv
)))
823 /* calculate first loss interval
825 * returns estimated loss interval in usecs */
827 static u32
ccid3_hc_rx_calc_first_li(struct sock
*sk
)
829 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
830 struct dccp_rx_hist_entry
*entry
, *next
, *tail
= NULL
;
832 suseconds_t rtt
, delta
;
833 struct timeval tstamp
= { 0, };
839 list_for_each_entry_safe(entry
, next
, &hcrx
->ccid3hcrx_hist
,
841 if (dccp_rx_hist_entry_data_packet(entry
)) {
846 tstamp
= entry
->dccphrx_tstamp
;
847 win_count
= entry
->dccphrx_ccval
;
851 interval
= win_count
- entry
->dccphrx_ccval
;
853 interval
+= TFRC_WIN_COUNT_LIMIT
;
861 if (unlikely(step
== 0)) {
862 DCCP_WARN("%s(%p), packet history has no data packets!\n",
867 if (unlikely(interval
== 0)) {
868 DCCP_WARN("%s(%p), Could not find a win_count interval > 0."
869 "Defaulting to 1\n", dccp_role(sk
), sk
);
874 DCCP_CRIT("tail is null\n");
878 delta
= timeval_delta(&tstamp
, &tail
->dccphrx_tstamp
);
879 DCCP_BUG_ON(delta
< 0);
881 rtt
= delta
* 4 / interval
;
882 ccid3_pr_debug("%s(%p), approximated RTT to %dus\n",
883 dccp_role(sk
), sk
, (int)rtt
);
886 * Determine the length of the first loss interval via inverse lookup.
887 * Assume that X_recv can be computed by the throughput equation
891 * Find some p such that f(p) = fval; return 1/p [RFC 3448, 6.3.1].
893 if (rtt
== 0) { /* would result in divide-by-zero */
894 DCCP_WARN("RTT==0\n");
898 dccp_timestamp(sk
, &tstamp
);
899 delta
= timeval_delta(&tstamp
, &hcrx
->ccid3hcrx_tstamp_last_feedback
);
900 DCCP_BUG_ON(delta
<= 0);
902 x_recv
= scaled_div32(hcrx
->ccid3hcrx_bytes_recv
, delta
);
903 if (x_recv
== 0) { /* would also trigger divide-by-zero */
904 DCCP_WARN("X_recv==0\n");
905 if ((x_recv
= hcrx
->ccid3hcrx_x_recv
) == 0) {
906 DCCP_BUG("stored value of X_recv is zero");
911 fval
= scaled_div(hcrx
->ccid3hcrx_s
, rtt
);
912 fval
= scaled_div32(fval
, x_recv
);
913 p
= tfrc_calc_x_reverse_lookup(fval
);
915 ccid3_pr_debug("%s(%p), receive rate=%u bytes/s, implied "
916 "loss rate=%u\n", dccp_role(sk
), sk
, x_recv
, p
);
924 static void ccid3_hc_rx_update_li(struct sock
*sk
, u64 seq_loss
, u8 win_loss
)
926 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
927 struct dccp_li_hist_entry
*head
;
930 if (list_empty(&hcrx
->ccid3hcrx_li_hist
)) {
931 if (!dccp_li_hist_interval_new(ccid3_li_hist
,
932 &hcrx
->ccid3hcrx_li_hist
, seq_loss
, win_loss
))
935 head
= list_entry(hcrx
->ccid3hcrx_li_hist
.next
,
936 struct dccp_li_hist_entry
, dccplih_node
);
937 head
->dccplih_interval
= ccid3_hc_rx_calc_first_li(sk
);
939 struct dccp_li_hist_entry
*entry
;
940 struct list_head
*tail
;
942 head
= list_entry(hcrx
->ccid3hcrx_li_hist
.next
,
943 struct dccp_li_hist_entry
, dccplih_node
);
944 /* FIXME win count check removed as was wrong */
945 /* should make this check with receive history */
946 /* and compare there as per section 10.2 of RFC4342 */
948 /* new loss event detected */
949 /* calculate last interval length */
950 seq_temp
= dccp_delta_seqno(head
->dccplih_seqno
, seq_loss
);
951 entry
= dccp_li_hist_entry_new(ccid3_li_hist
, GFP_ATOMIC
);
954 DCCP_BUG("out of memory - can not allocate entry");
958 list_add(&entry
->dccplih_node
, &hcrx
->ccid3hcrx_li_hist
);
960 tail
= hcrx
->ccid3hcrx_li_hist
.prev
;
962 kmem_cache_free(ccid3_li_hist
->dccplih_slab
, tail
);
964 /* Create the newest interval */
965 entry
->dccplih_seqno
= seq_loss
;
966 entry
->dccplih_interval
= seq_temp
;
967 entry
->dccplih_win_count
= win_loss
;
971 static int ccid3_hc_rx_detect_loss(struct sock
*sk
,
972 struct dccp_rx_hist_entry
*packet
)
974 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
975 struct dccp_rx_hist_entry
*rx_hist
=
976 dccp_rx_hist_head(&hcrx
->ccid3hcrx_hist
);
977 u64 seqno
= packet
->dccphrx_seqno
;
983 tmp_seqno
= hcrx
->ccid3hcrx_seqno_nonloss
;
986 follows48(packet
->dccphrx_seqno
, hcrx
->ccid3hcrx_seqno_nonloss
)) {
987 hcrx
->ccid3hcrx_seqno_nonloss
= seqno
;
988 hcrx
->ccid3hcrx_ccval_nonloss
= packet
->dccphrx_ccval
;
993 while (dccp_delta_seqno(hcrx
->ccid3hcrx_seqno_nonloss
, seqno
)
994 > TFRC_RECV_NUM_LATE_LOSS
) {
996 ccid3_hc_rx_update_li(sk
, hcrx
->ccid3hcrx_seqno_nonloss
,
997 hcrx
->ccid3hcrx_ccval_nonloss
);
998 tmp_seqno
= hcrx
->ccid3hcrx_seqno_nonloss
;
999 dccp_inc_seqno(&tmp_seqno
);
1000 hcrx
->ccid3hcrx_seqno_nonloss
= tmp_seqno
;
1001 dccp_inc_seqno(&tmp_seqno
);
1002 while (dccp_rx_hist_find_entry(&hcrx
->ccid3hcrx_hist
,
1003 tmp_seqno
, &ccval
)) {
1004 hcrx
->ccid3hcrx_seqno_nonloss
= tmp_seqno
;
1005 hcrx
->ccid3hcrx_ccval_nonloss
= ccval
;
1006 dccp_inc_seqno(&tmp_seqno
);
1010 /* FIXME - this code could be simplified with above while */
1011 /* but works at moment */
1012 if (follows48(packet
->dccphrx_seqno
, hcrx
->ccid3hcrx_seqno_nonloss
)) {
1013 hcrx
->ccid3hcrx_seqno_nonloss
= seqno
;
1014 hcrx
->ccid3hcrx_ccval_nonloss
= packet
->dccphrx_ccval
;
1018 dccp_rx_hist_add_packet(ccid3_rx_hist
, &hcrx
->ccid3hcrx_hist
,
1019 &hcrx
->ccid3hcrx_li_hist
, packet
,
1020 hcrx
->ccid3hcrx_seqno_nonloss
);
1024 static void ccid3_hc_rx_packet_recv(struct sock
*sk
, struct sk_buff
*skb
)
1026 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1027 const struct dccp_options_received
*opt_recv
;
1028 struct dccp_rx_hist_entry
*packet
;
1030 u32 p_prev
, r_sample
, rtt_prev
;
1031 int loss
, payload_size
;
1033 BUG_ON(hcrx
== NULL
);
1035 opt_recv
= &dccp_sk(sk
)->dccps_options_received
;
1037 switch (DCCP_SKB_CB(skb
)->dccpd_type
) {
1039 if (hcrx
->ccid3hcrx_state
== TFRC_RSTATE_NO_DATA
)
1041 case DCCP_PKT_DATAACK
:
1042 if (opt_recv
->dccpor_timestamp_echo
== 0)
1044 rtt_prev
= hcrx
->ccid3hcrx_rtt
;
1045 dccp_timestamp(sk
, &now
);
1046 r_sample
= dccp_sample_rtt(sk
, &now
, NULL
);
1048 if (hcrx
->ccid3hcrx_state
== TFRC_RSTATE_NO_DATA
)
1049 hcrx
->ccid3hcrx_rtt
= r_sample
;
1051 hcrx
->ccid3hcrx_rtt
= (hcrx
->ccid3hcrx_rtt
* 9) / 10 +
1054 if (rtt_prev
!= hcrx
->ccid3hcrx_rtt
)
1055 ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n",
1056 dccp_role(sk
), sk
, hcrx
->ccid3hcrx_rtt
,
1057 opt_recv
->dccpor_elapsed_time
);
1061 default: /* We're not interested in other packet types, move along */
1065 packet
= dccp_rx_hist_entry_new(ccid3_rx_hist
, sk
, opt_recv
->dccpor_ndp
,
1067 if (unlikely(packet
== NULL
)) {
1068 DCCP_WARN("%s(%p), Not enough mem to add rx packet "
1069 "to history, consider it lost!\n", dccp_role(sk
), sk
);
1073 loss
= ccid3_hc_rx_detect_loss(sk
, packet
);
1075 if (DCCP_SKB_CB(skb
)->dccpd_type
== DCCP_PKT_ACK
)
1078 payload_size
= skb
->len
- dccp_hdr(skb
)->dccph_doff
* 4;
1079 ccid3_hc_rx_update_s(hcrx
, payload_size
);
1081 switch (hcrx
->ccid3hcrx_state
) {
1082 case TFRC_RSTATE_NO_DATA
:
1083 ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial "
1084 "feedback\n", dccp_role(sk
), sk
,
1085 dccp_state_name(sk
->sk_state
), skb
);
1086 ccid3_hc_rx_send_feedback(sk
);
1087 ccid3_hc_rx_set_state(sk
, TFRC_RSTATE_DATA
);
1089 case TFRC_RSTATE_DATA
:
1090 hcrx
->ccid3hcrx_bytes_recv
+= payload_size
;
1094 dccp_timestamp(sk
, &now
);
1095 if ((timeval_delta(&now
, &hcrx
->ccid3hcrx_tstamp_last_ack
) -
1096 (suseconds_t
)hcrx
->ccid3hcrx_rtt
) >= 0) {
1097 hcrx
->ccid3hcrx_tstamp_last_ack
= now
;
1098 ccid3_hc_rx_send_feedback(sk
);
1101 case TFRC_RSTATE_TERM
:
1102 DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk
), sk
);
1106 /* Dealing with packet loss */
1107 ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n",
1108 dccp_role(sk
), sk
, dccp_state_name(sk
->sk_state
));
1110 p_prev
= hcrx
->ccid3hcrx_p
;
1112 /* Calculate loss event rate */
1113 if (!list_empty(&hcrx
->ccid3hcrx_li_hist
)) {
1114 u32 i_mean
= dccp_li_hist_calc_i_mean(&hcrx
->ccid3hcrx_li_hist
);
1116 /* Scaling up by 1000000 as fixed decimal */
1118 hcrx
->ccid3hcrx_p
= 1000000 / i_mean
;
1120 DCCP_BUG("empty loss history");
1122 if (hcrx
->ccid3hcrx_p
> p_prev
) {
1123 ccid3_hc_rx_send_feedback(sk
);
1128 static int ccid3_hc_rx_init(struct ccid
*ccid
, struct sock
*sk
)
1130 struct ccid3_hc_rx_sock
*hcrx
= ccid_priv(ccid
);
1132 ccid3_pr_debug("entry\n");
1134 hcrx
->ccid3hcrx_state
= TFRC_RSTATE_NO_DATA
;
1135 INIT_LIST_HEAD(&hcrx
->ccid3hcrx_hist
);
1136 INIT_LIST_HEAD(&hcrx
->ccid3hcrx_li_hist
);
1137 dccp_timestamp(sk
, &hcrx
->ccid3hcrx_tstamp_last_ack
);
1138 hcrx
->ccid3hcrx_tstamp_last_feedback
= hcrx
->ccid3hcrx_tstamp_last_ack
;
1139 hcrx
->ccid3hcrx_s
= 0;
1140 hcrx
->ccid3hcrx_rtt
= 0;
1144 static void ccid3_hc_rx_exit(struct sock
*sk
)
1146 struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1148 BUG_ON(hcrx
== NULL
);
1150 ccid3_hc_rx_set_state(sk
, TFRC_RSTATE_TERM
);
1152 /* Empty packet history */
1153 dccp_rx_hist_purge(ccid3_rx_hist
, &hcrx
->ccid3hcrx_hist
);
1155 /* Empty loss interval history */
1156 dccp_li_hist_purge(ccid3_li_hist
, &hcrx
->ccid3hcrx_li_hist
);
1159 static void ccid3_hc_rx_get_info(struct sock
*sk
, struct tcp_info
*info
)
1161 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1163 /* Listen socks doesn't have a private CCID block */
1164 if (sk
->sk_state
== DCCP_LISTEN
)
1167 BUG_ON(hcrx
== NULL
);
1169 info
->tcpi_ca_state
= hcrx
->ccid3hcrx_state
;
1170 info
->tcpi_options
|= TCPI_OPT_TIMESTAMPS
;
1171 info
->tcpi_rcv_rtt
= hcrx
->ccid3hcrx_rtt
;
1174 static int ccid3_hc_rx_getsockopt(struct sock
*sk
, const int optname
, int len
,
1175 u32 __user
*optval
, int __user
*optlen
)
1177 const struct ccid3_hc_rx_sock
*hcrx
= ccid3_hc_rx_sk(sk
);
1180 /* Listen socks doesn't have a private CCID block */
1181 if (sk
->sk_state
== DCCP_LISTEN
)
1185 case DCCP_SOCKOPT_CCID_RX_INFO
:
1186 if (len
< sizeof(hcrx
->ccid3hcrx_tfrc
))
1188 len
= sizeof(hcrx
->ccid3hcrx_tfrc
);
1189 val
= &hcrx
->ccid3hcrx_tfrc
;
1192 return -ENOPROTOOPT
;
1195 if (put_user(len
, optlen
) || copy_to_user(optval
, val
, len
))
1201 static struct ccid_operations ccid3
= {
1202 .ccid_id
= DCCPC_CCID3
,
1203 .ccid_name
= "ccid3",
1204 .ccid_owner
= THIS_MODULE
,
1205 .ccid_hc_tx_obj_size
= sizeof(struct ccid3_hc_tx_sock
),
1206 .ccid_hc_tx_init
= ccid3_hc_tx_init
,
1207 .ccid_hc_tx_exit
= ccid3_hc_tx_exit
,
1208 .ccid_hc_tx_send_packet
= ccid3_hc_tx_send_packet
,
1209 .ccid_hc_tx_packet_sent
= ccid3_hc_tx_packet_sent
,
1210 .ccid_hc_tx_packet_recv
= ccid3_hc_tx_packet_recv
,
1211 .ccid_hc_tx_parse_options
= ccid3_hc_tx_parse_options
,
1212 .ccid_hc_rx_obj_size
= sizeof(struct ccid3_hc_rx_sock
),
1213 .ccid_hc_rx_init
= ccid3_hc_rx_init
,
1214 .ccid_hc_rx_exit
= ccid3_hc_rx_exit
,
1215 .ccid_hc_rx_insert_options
= ccid3_hc_rx_insert_options
,
1216 .ccid_hc_rx_packet_recv
= ccid3_hc_rx_packet_recv
,
1217 .ccid_hc_rx_get_info
= ccid3_hc_rx_get_info
,
1218 .ccid_hc_tx_get_info
= ccid3_hc_tx_get_info
,
1219 .ccid_hc_rx_getsockopt
= ccid3_hc_rx_getsockopt
,
1220 .ccid_hc_tx_getsockopt
= ccid3_hc_tx_getsockopt
,
1223 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
1224 module_param(ccid3_debug
, int, 0444);
1225 MODULE_PARM_DESC(ccid3_debug
, "Enable debug messages");
1228 static __init
int ccid3_module_init(void)
1232 ccid3_rx_hist
= dccp_rx_hist_new("ccid3");
1233 if (ccid3_rx_hist
== NULL
)
1236 ccid3_tx_hist
= dccp_tx_hist_new("ccid3");
1237 if (ccid3_tx_hist
== NULL
)
1240 ccid3_li_hist
= dccp_li_hist_new("ccid3");
1241 if (ccid3_li_hist
== NULL
)
1244 rc
= ccid_register(&ccid3
);
1246 goto out_free_loss_interval_history
;
1250 out_free_loss_interval_history
:
1251 dccp_li_hist_delete(ccid3_li_hist
);
1252 ccid3_li_hist
= NULL
;
1254 dccp_tx_hist_delete(ccid3_tx_hist
);
1255 ccid3_tx_hist
= NULL
;
1257 dccp_rx_hist_delete(ccid3_rx_hist
);
1258 ccid3_rx_hist
= NULL
;
1261 module_init(ccid3_module_init
);
1263 static __exit
void ccid3_module_exit(void)
1265 ccid_unregister(&ccid3
);
1267 if (ccid3_tx_hist
!= NULL
) {
1268 dccp_tx_hist_delete(ccid3_tx_hist
);
1269 ccid3_tx_hist
= NULL
;
1271 if (ccid3_rx_hist
!= NULL
) {
1272 dccp_rx_hist_delete(ccid3_rx_hist
);
1273 ccid3_rx_hist
= NULL
;
1275 if (ccid3_li_hist
!= NULL
) {
1276 dccp_li_hist_delete(ccid3_li_hist
);
1277 ccid3_li_hist
= NULL
;
1280 module_exit(ccid3_module_exit
);
1282 MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, "
1283 "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
1284 MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID");
1285 MODULE_LICENSE("GPL");
1286 MODULE_ALIAS("net-dccp-ccid-3");