]>
Commit | Line | Data |
---|---|---|
7c657876 ACM |
1 | /* |
2 | * net/dccp/ccids/ccid3.c | |
3 | * | |
4 | * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand. | |
e6bccd35 | 5 | * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz> |
7c657876 ACM |
6 | * |
7 | * An implementation of the DCCP protocol | |
8 | * | |
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/ | |
7c657876 ACM |
11 | * |
12 | * This code also uses code from Lulea University, rereleased as GPL by its | |
13 | * authors: | |
14 | * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon | |
15 | * | |
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>. | |
19 | * | |
20 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
21 | * | |
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. | |
26 | * | |
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. | |
31 | * | |
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. | |
35 | */ | |
36 | ||
37 | #include "../ccid.h" | |
38 | #include "../dccp.h" | |
4524b259 | 39 | #include "lib/packet_history.h" |
ae6706f0 | 40 | #include "lib/loss_interval.h" |
36729c1a | 41 | #include "lib/tfrc.h" |
7c657876 ACM |
42 | #include "ccid3.h" |
43 | ||
6b5e633a | 44 | /* |
0ba7a3ba ACM |
45 | * Reason for maths here is to avoid 32 bit overflow when a is big. |
46 | * With this we get close to the limit. | |
6b5e633a | 47 | */ |
c25a18ba | 48 | static u32 usecs_div(const u32 a, const u32 b) |
6b5e633a | 49 | { |
0ba7a3ba ACM |
50 | const u32 div = a < (UINT_MAX / (USEC_PER_SEC / 10)) ? 10 : |
51 | a < (UINT_MAX / (USEC_PER_SEC / 50)) ? 50 : | |
52 | a < (UINT_MAX / (USEC_PER_SEC / 100)) ? 100 : | |
53 | a < (UINT_MAX / (USEC_PER_SEC / 500)) ? 500 : | |
54 | a < (UINT_MAX / (USEC_PER_SEC / 1000)) ? 1000 : | |
55 | a < (UINT_MAX / (USEC_PER_SEC / 5000)) ? 5000 : | |
56 | a < (UINT_MAX / (USEC_PER_SEC / 10000)) ? 10000 : | |
57 | a < (UINT_MAX / (USEC_PER_SEC / 50000)) ? 50000 : | |
58 | 100000; | |
59 | const u32 tmp = a * (USEC_PER_SEC / div); | |
60 | return (b >= 2 * div) ? tmp / (b / div) : tmp; | |
6b5e633a ACM |
61 | } |
62 | ||
7c657876 | 63 | |
56724aa4 GR |
64 | |
65 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG | |
66 | static int ccid3_debug; | |
67 | #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) | |
7c657876 ACM |
68 | #else |
69 | #define ccid3_pr_debug(format, a...) | |
70 | #endif | |
71 | ||
a1d3a355 ACM |
72 | static struct dccp_tx_hist *ccid3_tx_hist; |
73 | static struct dccp_rx_hist *ccid3_rx_hist; | |
ae6706f0 | 74 | static struct dccp_li_hist *ccid3_li_hist; |
7c657876 | 75 | |
56724aa4 | 76 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
77 | static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) |
78 | { | |
79 | static char *ccid3_state_names[] = { | |
80 | [TFRC_SSTATE_NO_SENT] = "NO_SENT", | |
81 | [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", | |
82 | [TFRC_SSTATE_FBACK] = "FBACK", | |
83 | [TFRC_SSTATE_TERM] = "TERM", | |
84 | }; | |
85 | ||
86 | return ccid3_state_names[state]; | |
87 | } | |
88 | #endif | |
89 | ||
c25a18ba ACM |
90 | static void ccid3_hc_tx_set_state(struct sock *sk, |
91 | enum ccid3_hc_tx_states state) | |
7c657876 | 92 | { |
59725dc2 | 93 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 ACM |
94 | enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; |
95 | ||
96 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
97 | dccp_role(sk), sk, ccid3_tx_state_name(oldstate), |
98 | ccid3_tx_state_name(state)); | |
7c657876 ACM |
99 | WARN_ON(state == oldstate); |
100 | hctx->ccid3hctx_state = state; | |
101 | } | |
102 | ||
17893bc1 GR |
103 | /* |
104 | * Recalculate scheduled nominal send time t_nom, inter-packet interval | |
105 | * t_ipi, and delta value. Should be called after each change to X. | |
106 | */ | |
107 | static inline void ccid3_update_send_time(struct ccid3_hc_tx_sock *hctx) | |
7c657876 | 108 | { |
17893bc1 GR |
109 | timeval_sub_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
110 | ||
111 | /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */ | |
f5c2d636 | 112 | hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_x); |
7c657876 | 113 | |
17893bc1 GR |
114 | /* Update nominal send time with regard to the new t_ipi */ |
115 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); | |
116 | ||
117 | /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ | |
1f2333ae ACM |
118 | hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, |
119 | TFRC_OPSYS_HALF_TIME_GRAN); | |
7c657876 | 120 | } |
7c657876 ACM |
121 | /* |
122 | * Update X by | |
123 | * If (p > 0) | |
124 | * x_calc = calcX(s, R, p); | |
125 | * X = max(min(X_calc, 2 * X_recv), s / t_mbi); | |
126 | * Else | |
127 | * If (now - tld >= R) | |
128 | * X = max(min(2 * X, 2 * X_recv), s / R); | |
129 | * tld = now; | |
130 | */ | |
131 | static void ccid3_hc_tx_update_x(struct sock *sk) | |
132 | { | |
59725dc2 | 133 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
17893bc1 | 134 | const __u32 old_x = hctx->ccid3hctx_x; |
7c657876 | 135 | |
1f2333ae ACM |
136 | /* To avoid large error in calcX */ |
137 | if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { | |
36729c1a ACM |
138 | hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, |
139 | hctx->ccid3hctx_rtt, | |
140 | hctx->ccid3hctx_p); | |
1f2333ae ACM |
141 | hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, |
142 | 2 * hctx->ccid3hctx_x_recv), | |
143 | (hctx->ccid3hctx_s / | |
144 | TFRC_MAX_BACK_OFF_TIME)); | |
b6ee3d4a ACM |
145 | } else { |
146 | struct timeval now; | |
147 | ||
b0e56780 | 148 | dccp_timestamp(sk, &now); |
b6ee3d4a ACM |
149 | if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >= |
150 | hctx->ccid3hctx_rtt) { | |
6b5e633a ACM |
151 | hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv, |
152 | hctx->ccid3hctx_x) * 2, | |
153 | usecs_div(hctx->ccid3hctx_s, | |
154 | hctx->ccid3hctx_rtt)); | |
b6ee3d4a ACM |
155 | hctx->ccid3hctx_t_ld = now; |
156 | } | |
7c657876 | 157 | } |
17893bc1 GR |
158 | if (hctx->ccid3hctx_x != old_x) |
159 | ccid3_update_send_time(hctx); | |
7c657876 ACM |
160 | } |
161 | ||
78ad713d GR |
162 | /* |
163 | * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) | |
164 | * @len: DCCP packet payload size in bytes | |
165 | */ | |
166 | static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) | |
167 | { | |
168 | if (unlikely(len == 0)) | |
169 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); | |
170 | else | |
171 | hctx->ccid3hctx_s = hctx->ccid3hctx_s == 0 ? len : | |
172 | (9 * hctx->ccid3hctx_s + len) / 10; | |
173 | /* | |
174 | * Note: We could do a potential optimisation here - when `s' changes, | |
175 | * recalculate sending rate and consequently t_ipi, t_delta, and | |
176 | * t_now. This is however non-standard, and the benefits are not | |
177 | * clear, so it is currently left out. | |
178 | */ | |
179 | } | |
180 | ||
7c657876 ACM |
181 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) |
182 | { | |
183 | struct sock *sk = (struct sock *)data; | |
59725dc2 | 184 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
2a1fda6f | 185 | unsigned long t_nfb = USEC_PER_SEC / 5; |
7c657876 ACM |
186 | |
187 | bh_lock_sock(sk); | |
188 | if (sock_owned_by_user(sk)) { | |
189 | /* Try again later. */ | |
190 | /* XXX: set some sensible MIB */ | |
48e03eee | 191 | goto restart_timer; |
7c657876 ACM |
192 | } |
193 | ||
194 | ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, | |
195 | ccid3_tx_state_name(hctx->ccid3hctx_state)); | |
196 | ||
7c657876 | 197 | switch (hctx->ccid3hctx_state) { |
7c657876 ACM |
198 | case TFRC_SSTATE_NO_FBACK: |
199 | /* Halve send rate */ | |
200 | hctx->ccid3hctx_x /= 2; | |
6b5e633a ACM |
201 | if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / |
202 | TFRC_MAX_BACK_OFF_TIME)) | |
1f2333ae ACM |
203 | hctx->ccid3hctx_x = (hctx->ccid3hctx_s / |
204 | TFRC_MAX_BACK_OFF_TIME); | |
7c657876 | 205 | |
1f2333ae ACM |
206 | ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " |
207 | "bytes/s\n", | |
208 | dccp_role(sk), sk, | |
209 | ccid3_tx_state_name(hctx->ccid3hctx_state), | |
7c657876 | 210 | hctx->ccid3hctx_x); |
48e03eee GR |
211 | /* The value of R is still undefined and so we can not recompute |
212 | * the timout value. Keep initial value as per [RFC 4342, 5]. */ | |
2a1fda6f | 213 | t_nfb = TFRC_INITIAL_TIMEOUT; |
17893bc1 | 214 | ccid3_update_send_time(hctx); |
7c657876 ACM |
215 | break; |
216 | case TFRC_SSTATE_FBACK: | |
1f2333ae ACM |
217 | /* |
218 | * Check if IDLE since last timeout and recv rate is less than | |
219 | * 4 packets per RTT | |
220 | */ | |
1f2333ae | 221 | if (!hctx->ccid3hctx_idle || |
6b5e633a ACM |
222 | (hctx->ccid3hctx_x_recv >= |
223 | 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { | |
1f2333ae ACM |
224 | ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", |
225 | dccp_role(sk), sk, | |
7c657876 ACM |
226 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
227 | /* Halve sending rate */ | |
228 | ||
229 | /* If (X_calc > 2 * X_recv) | |
230 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); | |
231 | * Else | |
232 | * X_recv = X_calc / 4; | |
233 | */ | |
1f2333ae ACM |
234 | BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && |
235 | hctx->ccid3hctx_x_calc == 0); | |
7c657876 ACM |
236 | |
237 | /* check also if p is zero -> x_calc is infinity? */ | |
238 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P || | |
239 | hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) | |
240 | hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, | |
241 | hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME)); | |
242 | else | |
243 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; | |
244 | ||
245 | /* Update sending rate */ | |
246 | ccid3_hc_tx_update_x(sk); | |
247 | } | |
6b5e633a ACM |
248 | /* |
249 | * Schedule no feedback timer to expire in | |
2a1fda6f | 250 | * max(4 * R, 2 * s/X) = max(4 * R, 2 * t_ipi) |
6b5e633a | 251 | */ |
2a1fda6f | 252 | t_nfb = max(4 * hctx->ccid3hctx_rtt, 2 * hctx->ccid3hctx_t_ipi); |
7c657876 | 253 | break; |
59348b19 GR |
254 | case TFRC_SSTATE_NO_SENT: |
255 | DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); | |
256 | /* fall through */ | |
257 | case TFRC_SSTATE_TERM: | |
7c657876 ACM |
258 | goto out; |
259 | } | |
260 | ||
7c657876 | 261 | hctx->ccid3hctx_idle = 1; |
48e03eee GR |
262 | |
263 | restart_timer: | |
264 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
2a1fda6f | 265 | jiffies + usecs_to_jiffies(t_nfb)); |
7c657876 ACM |
266 | out: |
267 | bh_unlock_sock(sk); | |
268 | sock_put(sk); | |
269 | } | |
270 | ||
7da7f456 GR |
271 | /* |
272 | * returns | |
273 | * > 0: delay (in msecs) that should pass before actually sending | |
274 | * = 0: can send immediately | |
275 | * < 0: error condition; do not send packet | |
276 | */ | |
27258ee5 ACM |
277 | static int ccid3_hc_tx_send_packet(struct sock *sk, |
278 | struct sk_buff *skb, int len) | |
7c657876 ACM |
279 | { |
280 | struct dccp_sock *dp = dccp_sk(sk); | |
59725dc2 | 281 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
8c60f3fa | 282 | struct dccp_tx_hist_entry *new_packet; |
7c657876 | 283 | struct timeval now; |
27258ee5 | 284 | long delay; |
7c657876 | 285 | |
59348b19 | 286 | BUG_ON(hctx == NULL); |
1f2333ae | 287 | |
7c657876 | 288 | /* |
da335baf GR |
289 | * This function is called only for Data and DataAck packets. Sending |
290 | * zero-sized Data(Ack)s is theoretically possible, but for congestion | |
291 | * control this case is pathological - ignore it. | |
7c657876 | 292 | */ |
59d203f9 | 293 | if (unlikely(len == 0)) |
da335baf | 294 | return -EBADMSG; |
7c657876 ACM |
295 | |
296 | /* See if last packet allocated was not sent */ | |
8c60f3fa ACM |
297 | new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
298 | if (new_packet == NULL || new_packet->dccphtx_sent) { | |
1f2333ae ACM |
299 | new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, |
300 | SLAB_ATOMIC); | |
7c657876 | 301 | |
59d203f9 | 302 | if (unlikely(new_packet == NULL)) { |
59348b19 GR |
303 | DCCP_WARN("%s, sk=%p, not enough mem to add to history," |
304 | "send refused\n", dccp_role(sk), sk); | |
7da7f456 | 305 | return -ENOBUFS; |
7c657876 ACM |
306 | } |
307 | ||
8c60f3fa | 308 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); |
7c657876 ACM |
309 | } |
310 | ||
b0e56780 | 311 | dccp_timestamp(sk, &now); |
7c657876 ACM |
312 | |
313 | switch (hctx->ccid3hctx_state) { | |
314 | case TFRC_SSTATE_NO_SENT: | |
1f2333ae ACM |
315 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
316 | jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); | |
7c657876 ACM |
317 | hctx->ccid3hctx_last_win_count = 0; |
318 | hctx->ccid3hctx_t_last_win_count = now; | |
319 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); | |
7c657876 | 320 | |
78ad713d GR |
321 | /* Set initial sending rate to 1 packet per second */ |
322 | ccid3_hc_tx_update_s(hctx, len); | |
323 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; | |
324 | ||
90feeb95 GR |
325 | /* First timeout, according to [RFC 3448, 4.2], is 1 second */ |
326 | hctx->ccid3hctx_t_ipi = USEC_PER_SEC; | |
327 | /* Initial delta: minimum of 0.5 sec and t_gran/2 */ | |
328 | hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; | |
329 | ||
330 | /* Set t_0 for initial packet */ | |
7c657876 | 331 | hctx->ccid3hctx_t_nom = now; |
7c657876 ACM |
332 | break; |
333 | case TFRC_SSTATE_NO_FBACK: | |
334 | case TFRC_SSTATE_FBACK: | |
91cf5a17 GR |
335 | delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); |
336 | /* | |
337 | * Scheduling of packet transmissions [RFC 3448, 4.6] | |
338 | * | |
339 | * if (t_now > t_nom - delta) | |
340 | * // send the packet now | |
341 | * else | |
342 | * // send the packet in (t_nom - t_now) milliseconds. | |
343 | */ | |
7da7f456 GR |
344 | if (delay >= hctx->ccid3hctx_delta) |
345 | return delay / 1000L; | |
7c657876 | 346 | break; |
59348b19 GR |
347 | case TFRC_SSTATE_TERM: |
348 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7da7f456 | 349 | return -EINVAL; |
7c657876 ACM |
350 | } |
351 | ||
7da7f456 GR |
352 | /* prepare to send now (add options etc.) */ |
353 | dp->dccps_hc_tx_insert_options = 1; | |
354 | new_packet->dccphtx_ccval = DCCP_SKB_CB(skb)->dccpd_ccval = | |
355 | hctx->ccid3hctx_last_win_count; | |
356 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); | |
357 | ||
358 | return 0; | |
7c657876 ACM |
359 | } |
360 | ||
361 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len) | |
362 | { | |
59725dc2 ACM |
363 | const struct dccp_sock *dp = dccp_sk(sk); |
364 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 ACM |
365 | struct timeval now; |
366 | ||
59348b19 | 367 | BUG_ON(hctx == NULL); |
7c657876 | 368 | |
b0e56780 | 369 | dccp_timestamp(sk, &now); |
7c657876 ACM |
370 | |
371 | /* check if we have sent a data packet */ | |
372 | if (len > 0) { | |
373 | unsigned long quarter_rtt; | |
8c60f3fa | 374 | struct dccp_tx_hist_entry *packet; |
7c657876 | 375 | |
78ad713d GR |
376 | ccid3_hc_tx_update_s(hctx, len); |
377 | ||
8c60f3fa | 378 | packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
59d203f9 | 379 | if (unlikely(packet == NULL)) { |
59348b19 | 380 | DCCP_WARN("packet doesn't exist in history!\n"); |
7c657876 ACM |
381 | return; |
382 | } | |
59d203f9 | 383 | if (unlikely(packet->dccphtx_sent)) { |
59348b19 | 384 | DCCP_WARN("no unsent packet in history!\n"); |
7c657876 ACM |
385 | return; |
386 | } | |
8c60f3fa ACM |
387 | packet->dccphtx_tstamp = now; |
388 | packet->dccphtx_seqno = dp->dccps_gss; | |
7c657876 | 389 | /* |
1f2333ae | 390 | * Check if win_count have changed |
0e64e94e | 391 | * Algorithm in "8.1. Window Counter Value" in RFC 4342. |
7c657876 | 392 | */ |
6b5e633a ACM |
393 | quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); |
394 | if (likely(hctx->ccid3hctx_rtt > 8)) | |
395 | quarter_rtt /= hctx->ccid3hctx_rtt / 4; | |
396 | ||
7c657876 ACM |
397 | if (quarter_rtt > 0) { |
398 | hctx->ccid3hctx_t_last_win_count = now; | |
399 | hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + | |
400 | min_t(unsigned long, quarter_rtt, 5)) % 16; | |
1f2333ae ACM |
401 | ccid3_pr_debug("%s, sk=%p, window changed from " |
402 | "%u to %u!\n", | |
7c657876 | 403 | dccp_role(sk), sk, |
c1734376 | 404 | packet->dccphtx_ccval, |
7c657876 ACM |
405 | hctx->ccid3hctx_last_win_count); |
406 | } | |
1f2333ae | 407 | |
7c657876 | 408 | hctx->ccid3hctx_idle = 0; |
c1734376 | 409 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; |
8c60f3fa | 410 | packet->dccphtx_sent = 1; |
7c657876 ACM |
411 | } else |
412 | ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", | |
413 | dccp_role(sk), sk, dp->dccps_gss); | |
7c657876 ACM |
414 | } |
415 | ||
416 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) | |
417 | { | |
59725dc2 ACM |
418 | const struct dccp_sock *dp = dccp_sk(sk); |
419 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 | 420 | struct ccid3_options_received *opt_recv; |
8c60f3fa | 421 | struct dccp_tx_hist_entry *packet; |
b0e56780 | 422 | struct timeval now; |
2a1fda6f | 423 | unsigned long t_nfb; |
1bc09869 | 424 | u32 t_elapsed; |
7c657876 ACM |
425 | u32 pinv; |
426 | u32 x_recv; | |
427 | u32 r_sample; | |
1f2333ae | 428 | |
59348b19 | 429 | BUG_ON(hctx == NULL); |
7c657876 ACM |
430 | |
431 | /* we are only interested in ACKs */ | |
432 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || | |
433 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) | |
434 | return; | |
435 | ||
436 | opt_recv = &hctx->ccid3hctx_options_received; | |
437 | ||
1a28599a | 438 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; |
7c657876 ACM |
439 | x_recv = opt_recv->ccid3or_receive_rate; |
440 | pinv = opt_recv->ccid3or_loss_event_rate; | |
441 | ||
442 | switch (hctx->ccid3hctx_state) { | |
7c657876 ACM |
443 | case TFRC_SSTATE_NO_FBACK: |
444 | case TFRC_SSTATE_FBACK: | |
445 | /* Calculate new round trip sample by | |
446 | * R_sample = (now - t_recvdata) - t_delay */ | |
447 | /* get t_recvdata from history */ | |
8c60f3fa ACM |
448 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
449 | DCCP_SKB_CB(skb)->dccpd_ack_seq); | |
59d203f9 | 450 | if (unlikely(packet == NULL)) { |
59348b19 GR |
451 | DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist " |
452 | "in history!\n", dccp_role(sk), sk, | |
59d203f9 | 453 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
59348b19 | 454 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
7c657876 ACM |
455 | return; |
456 | } | |
457 | ||
458 | /* Update RTT */ | |
b0e56780 ACM |
459 | dccp_timestamp(sk, &now); |
460 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); | |
1a28599a | 461 | if (unlikely(r_sample <= t_elapsed)) |
59348b19 GR |
462 | DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n", |
463 | r_sample, t_elapsed); | |
1a28599a ACM |
464 | else |
465 | r_sample -= t_elapsed; | |
7c657876 ACM |
466 | |
467 | /* Update RTT estimate by | |
468 | * If (No feedback recv) | |
469 | * R = R_sample; | |
470 | * Else | |
471 | * R = q * R + (1 - q) * R_sample; | |
472 | * | |
473 | * q is a constant, RFC 3448 recomments 0.9 | |
474 | */ | |
475 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { | |
476 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); | |
477 | hctx->ccid3hctx_rtt = r_sample; | |
478 | } else | |
1f2333ae ACM |
479 | hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + |
480 | r_sample / 10; | |
7c657876 | 481 | |
1f2333ae ACM |
482 | ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " |
483 | "r_sample=%us\n", dccp_role(sk), sk, | |
484 | hctx->ccid3hctx_rtt, r_sample); | |
7c657876 | 485 | |
7c657876 | 486 | /* Update receive rate */ |
1f2333ae | 487 | hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ |
7c657876 ACM |
488 | |
489 | /* Update loss event rate */ | |
490 | if (pinv == ~0 || pinv == 0) | |
491 | hctx->ccid3hctx_p = 0; | |
492 | else { | |
493 | hctx->ccid3hctx_p = 1000000 / pinv; | |
494 | ||
495 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { | |
496 | hctx->ccid3hctx_p = TFRC_SMALLEST_P; | |
1f2333ae ACM |
497 | ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", |
498 | dccp_role(sk), sk); | |
7c657876 ACM |
499 | } |
500 | } | |
501 | ||
502 | /* unschedule no feedback timer */ | |
503 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
504 | ||
17893bc1 | 505 | /* Update sending rate (and likely t_ipi, t_nom, and delta) */ |
7c657876 ACM |
506 | ccid3_hc_tx_update_x(sk); |
507 | ||
7c657876 | 508 | /* remove all packets older than the one acked from history */ |
8c60f3fa ACM |
509 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
510 | &hctx->ccid3hctx_hist, packet); | |
c530cfb1 ACM |
511 | /* |
512 | * As we have calculated new ipi, delta, t_nom it is possible that | |
5d0dbc4a | 513 | * we now can send a packet, so wake up dccp_wait_for_ccid |
c530cfb1 ACM |
514 | */ |
515 | sk->sk_write_space(sk); | |
8c60f3fa | 516 | |
5d0dbc4a GR |
517 | |
518 | /* Update timeout interval. We use the alternative variant of | |
519 | * [RFC 3448, 3.1] which sets the upper bound of t_rto to one | |
520 | * second, as it is suggested for TCP (see RFC 2988, 2.4). */ | |
521 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, | |
522 | USEC_PER_SEC ); | |
1f2333ae ACM |
523 | /* |
524 | * Schedule no feedback timer to expire in | |
2a1fda6f | 525 | * max(4 * R, 2 * s/X) = max(4 * R, 2 * t_ipi) |
1f2333ae | 526 | */ |
2a1fda6f | 527 | t_nfb = max(4 * hctx->ccid3hctx_rtt, 2 * hctx->ccid3hctx_t_ipi); |
6b5e633a | 528 | |
1f2333ae ACM |
529 | ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " |
530 | "expire in %lu jiffies (%luus)\n", | |
531 | dccp_role(sk), sk, | |
2a1fda6f | 532 | usecs_to_jiffies(t_nfb), t_nfb); |
7c657876 ACM |
533 | |
534 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
2a1fda6f | 535 | jiffies + usecs_to_jiffies(t_nfb)); |
7c657876 ACM |
536 | |
537 | /* set idle flag */ | |
538 | hctx->ccid3hctx_idle = 1; | |
539 | break; | |
5e19e3fc GR |
540 | case TFRC_SSTATE_NO_SENT: |
541 | DCCP_WARN("Illegal ACK received - no packet has been sent\n"); | |
542 | /* fall through */ | |
543 | case TFRC_SSTATE_TERM: /* ignore feedback when closing */ | |
7c657876 ACM |
544 | break; |
545 | } | |
546 | } | |
547 | ||
2d0817d1 | 548 | static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 549 | { |
59d203f9 | 550 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 551 | |
59d203f9 ACM |
552 | BUG_ON(hctx == NULL); |
553 | ||
2d0817d1 ACM |
554 | if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) |
555 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; | |
556 | return 0; | |
7c657876 ACM |
557 | } |
558 | ||
559 | static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, | |
1f2333ae ACM |
560 | unsigned char len, u16 idx, |
561 | unsigned char *value) | |
7c657876 ACM |
562 | { |
563 | int rc = 0; | |
59725dc2 ACM |
564 | const struct dccp_sock *dp = dccp_sk(sk); |
565 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 ACM |
566 | struct ccid3_options_received *opt_recv; |
567 | ||
59d203f9 | 568 | BUG_ON(hctx == NULL); |
7c657876 ACM |
569 | |
570 | opt_recv = &hctx->ccid3hctx_options_received; | |
571 | ||
572 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { | |
573 | opt_recv->ccid3or_seqno = dp->dccps_gsr; | |
574 | opt_recv->ccid3or_loss_event_rate = ~0; | |
575 | opt_recv->ccid3or_loss_intervals_idx = 0; | |
576 | opt_recv->ccid3or_loss_intervals_len = 0; | |
577 | opt_recv->ccid3or_receive_rate = 0; | |
578 | } | |
579 | ||
580 | switch (option) { | |
581 | case TFRC_OPT_LOSS_EVENT_RATE: | |
59d203f9 | 582 | if (unlikely(len != 4)) { |
59348b19 GR |
583 | DCCP_WARN("%s, sk=%p, invalid len %d " |
584 | "for TFRC_OPT_LOSS_EVENT_RATE\n", | |
585 | dccp_role(sk), sk, len); | |
7c657876 ACM |
586 | rc = -EINVAL; |
587 | } else { | |
60fe62e7 | 588 | opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
589 | ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", |
590 | dccp_role(sk), sk, | |
591 | opt_recv->ccid3or_loss_event_rate); | |
592 | } | |
593 | break; | |
594 | case TFRC_OPT_LOSS_INTERVALS: | |
595 | opt_recv->ccid3or_loss_intervals_idx = idx; | |
596 | opt_recv->ccid3or_loss_intervals_len = len; | |
597 | ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", | |
598 | dccp_role(sk), sk, | |
599 | opt_recv->ccid3or_loss_intervals_idx, | |
600 | opt_recv->ccid3or_loss_intervals_len); | |
601 | break; | |
602 | case TFRC_OPT_RECEIVE_RATE: | |
59d203f9 | 603 | if (unlikely(len != 4)) { |
59348b19 GR |
604 | DCCP_WARN("%s, sk=%p, invalid len %d " |
605 | "for TFRC_OPT_RECEIVE_RATE\n", | |
606 | dccp_role(sk), sk, len); | |
7c657876 ACM |
607 | rc = -EINVAL; |
608 | } else { | |
60fe62e7 | 609 | opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
610 | ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", |
611 | dccp_role(sk), sk, | |
612 | opt_recv->ccid3or_receive_rate); | |
613 | } | |
614 | break; | |
615 | } | |
616 | ||
617 | return rc; | |
618 | } | |
619 | ||
91f0ebf7 | 620 | static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) |
7c657876 | 621 | { |
91f0ebf7 | 622 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
7c657876 | 623 | |
78ad713d | 624 | hctx->ccid3hctx_s = 0; |
7c657876 ACM |
625 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
626 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); | |
aa5d7df3 ACM |
627 | |
628 | hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; | |
629 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; | |
7c657876 ACM |
630 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
631 | ||
632 | return 0; | |
633 | } | |
634 | ||
635 | static void ccid3_hc_tx_exit(struct sock *sk) | |
636 | { | |
59725dc2 | 637 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 638 | |
7c657876 ACM |
639 | BUG_ON(hctx == NULL); |
640 | ||
641 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); | |
642 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
643 | ||
644 | /* Empty packet history */ | |
8c60f3fa | 645 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
7c657876 ACM |
646 | } |
647 | ||
648 | /* | |
649 | * RX Half Connection methods | |
650 | */ | |
651 | ||
56724aa4 | 652 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
653 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
654 | { | |
655 | static char *ccid3_rx_state_names[] = { | |
656 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", | |
657 | [TFRC_RSTATE_DATA] = "DATA", | |
658 | [TFRC_RSTATE_TERM] = "TERM", | |
659 | }; | |
660 | ||
661 | return ccid3_rx_state_names[state]; | |
662 | } | |
663 | #endif | |
664 | ||
c25a18ba ACM |
665 | static void ccid3_hc_rx_set_state(struct sock *sk, |
666 | enum ccid3_hc_rx_states state) | |
7c657876 | 667 | { |
59725dc2 | 668 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 ACM |
669 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
670 | ||
671 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
672 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
673 | ccid3_rx_state_name(state)); | |
7c657876 ACM |
674 | WARN_ON(state == oldstate); |
675 | hcrx->ccid3hcrx_state = state; | |
676 | } | |
677 | ||
78ad713d GR |
678 | static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) |
679 | { | |
680 | if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ | |
681 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); | |
682 | else | |
683 | hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : | |
684 | (9 * hcrx->ccid3hcrx_s + len) / 10; | |
685 | } | |
686 | ||
7c657876 ACM |
687 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
688 | { | |
59725dc2 | 689 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 690 | struct dccp_sock *dp = dccp_sk(sk); |
8c60f3fa | 691 | struct dccp_rx_hist_entry *packet; |
b6ee3d4a | 692 | struct timeval now; |
7c657876 ACM |
693 | |
694 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
695 | ||
b0e56780 | 696 | dccp_timestamp(sk, &now); |
b6ee3d4a | 697 | |
7c657876 ACM |
698 | switch (hcrx->ccid3hcrx_state) { |
699 | case TFRC_RSTATE_NO_DATA: | |
700 | hcrx->ccid3hcrx_x_recv = 0; | |
701 | break; | |
702 | case TFRC_RSTATE_DATA: { | |
b6ee3d4a ACM |
703 | const u32 delta = timeval_delta(&now, |
704 | &hcrx->ccid3hcrx_tstamp_last_feedback); | |
27ae543e ACM |
705 | hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, |
706 | delta); | |
7c657876 ACM |
707 | } |
708 | break; | |
59348b19 GR |
709 | case TFRC_RSTATE_TERM: |
710 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
711 | return; |
712 | } | |
713 | ||
8c60f3fa | 714 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
59d203f9 | 715 | if (unlikely(packet == NULL)) { |
59348b19 GR |
716 | DCCP_WARN("%s, sk=%p, no data packet in history!\n", |
717 | dccp_role(sk), sk); | |
7c657876 ACM |
718 | return; |
719 | } | |
720 | ||
b6ee3d4a | 721 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
66a377c5 | 722 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
7c657876 ACM |
723 | hcrx->ccid3hcrx_bytes_recv = 0; |
724 | ||
725 | /* Convert to multiples of 10us */ | |
b6ee3d4a ACM |
726 | hcrx->ccid3hcrx_elapsed_time = |
727 | timeval_delta(&now, &packet->dccphrx_tstamp) / 10; | |
7c657876 ACM |
728 | if (hcrx->ccid3hcrx_p == 0) |
729 | hcrx->ccid3hcrx_pinv = ~0; | |
730 | else | |
731 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; | |
507d37cf | 732 | dp->dccps_hc_rx_insert_options = 1; |
7c657876 ACM |
733 | dccp_send_ack(sk); |
734 | } | |
735 | ||
2d0817d1 | 736 | static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 737 | { |
59d203f9 | 738 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
60fe62e7 | 739 | __be32 x_recv, pinv; |
7c657876 | 740 | |
59d203f9 ACM |
741 | BUG_ON(hcrx == NULL); |
742 | ||
743 | if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) | |
2d0817d1 | 744 | return 0; |
7c657876 | 745 | |
66a377c5 | 746 | DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; |
4fded33b ACM |
747 | |
748 | if (dccp_packet_without_ack(skb)) | |
2d0817d1 ACM |
749 | return 0; |
750 | ||
4fded33b ACM |
751 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
752 | pinv = htonl(hcrx->ccid3hcrx_pinv); | |
2d0817d1 ACM |
753 | |
754 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && | |
755 | dccp_insert_option_elapsed_time(sk, skb, | |
756 | hcrx->ccid3hcrx_elapsed_time)) || | |
757 | dccp_insert_option_timestamp(sk, skb) || | |
758 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, | |
759 | &pinv, sizeof(pinv)) || | |
760 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, | |
761 | &x_recv, sizeof(x_recv))) | |
762 | return -1; | |
763 | ||
764 | return 0; | |
7c657876 ACM |
765 | } |
766 | ||
7c657876 ACM |
767 | /* calculate first loss interval |
768 | * | |
769 | * returns estimated loss interval in usecs */ | |
770 | ||
771 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) | |
772 | { | |
59725dc2 | 773 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
8c60f3fa | 774 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
7c657876 | 775 | u32 rtt, delta, x_recv, fval, p, tmp2; |
b6ee3d4a | 776 | struct timeval tstamp = { 0, }; |
7c657876 ACM |
777 | int interval = 0; |
778 | int win_count = 0; | |
779 | int step = 0; | |
780 | u64 tmp1; | |
781 | ||
8c60f3fa ACM |
782 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
783 | dccphrx_node) { | |
784 | if (dccp_rx_hist_entry_data_packet(entry)) { | |
7c657876 ACM |
785 | tail = entry; |
786 | ||
787 | switch (step) { | |
788 | case 0: | |
8c60f3fa | 789 | tstamp = entry->dccphrx_tstamp; |
c1734376 | 790 | win_count = entry->dccphrx_ccval; |
7c657876 ACM |
791 | step = 1; |
792 | break; | |
793 | case 1: | |
c1734376 | 794 | interval = win_count - entry->dccphrx_ccval; |
7c657876 ACM |
795 | if (interval < 0) |
796 | interval += TFRC_WIN_COUNT_LIMIT; | |
797 | if (interval > 4) | |
798 | goto found; | |
799 | break; | |
800 | } | |
801 | } | |
802 | } | |
803 | ||
59d203f9 | 804 | if (unlikely(step == 0)) { |
59348b19 GR |
805 | DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", |
806 | dccp_role(sk), sk); | |
7c657876 ACM |
807 | return ~0; |
808 | } | |
809 | ||
59d203f9 | 810 | if (unlikely(interval == 0)) { |
59348b19 GR |
811 | DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." |
812 | "Defaulting to 1\n", dccp_role(sk), sk); | |
7c657876 ACM |
813 | interval = 1; |
814 | } | |
815 | found: | |
66a377c5 | 816 | if (!tail) { |
59348b19 | 817 | DCCP_CRIT("tail is null\n"); |
66a377c5 IM |
818 | return ~0; |
819 | } | |
b6ee3d4a | 820 | rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; |
7c657876 ACM |
821 | ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", |
822 | dccp_role(sk), sk, rtt); | |
59348b19 GR |
823 | |
824 | if (rtt == 0) { | |
825 | DCCP_WARN("RTT==0, setting to 1\n"); | |
826 | rtt = 1; | |
827 | } | |
7c657876 | 828 | |
b0e56780 ACM |
829 | dccp_timestamp(sk, &tstamp); |
830 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); | |
831 | x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); | |
7c657876 | 832 | |
66a377c5 IM |
833 | if (x_recv == 0) |
834 | x_recv = hcrx->ccid3hcrx_x_recv; | |
835 | ||
7c657876 ACM |
836 | tmp1 = (u64)x_recv * (u64)rtt; |
837 | do_div(tmp1,10000000); | |
838 | tmp2 = (u32)tmp1; | |
66a377c5 IM |
839 | |
840 | if (!tmp2) { | |
59348b19 | 841 | DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv, rtt); |
66a377c5 IM |
842 | return ~0; |
843 | } | |
844 | ||
7c657876 ACM |
845 | fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; |
846 | /* do not alter order above or you will get overflow on 32 bit */ | |
36729c1a | 847 | p = tfrc_calc_x_reverse_lookup(fval); |
1f2333ae ACM |
848 | ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " |
849 | "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); | |
7c657876 ACM |
850 | |
851 | if (p == 0) | |
852 | return ~0; | |
853 | else | |
854 | return 1000000 / p; | |
855 | } | |
856 | ||
857 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) | |
858 | { | |
59725dc2 | 859 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
fc747e82 | 860 | struct dccp_li_hist_entry *head; |
66a377c5 | 861 | u64 seq_temp; |
7c657876 | 862 | |
66a377c5 IM |
863 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
864 | if (!dccp_li_hist_interval_new(ccid3_li_hist, | |
865 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) | |
866 | return; | |
7c657876 | 867 | |
fc747e82 IM |
868 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
869 | struct dccp_li_hist_entry, dccplih_node); | |
870 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); | |
66a377c5 IM |
871 | } else { |
872 | struct dccp_li_hist_entry *entry; | |
873 | struct list_head *tail; | |
874 | ||
fc747e82 IM |
875 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
876 | struct dccp_li_hist_entry, dccplih_node); | |
66a377c5 IM |
877 | /* FIXME win count check removed as was wrong */ |
878 | /* should make this check with receive history */ | |
879 | /* and compare there as per section 10.2 of RFC4342 */ | |
880 | ||
881 | /* new loss event detected */ | |
882 | /* calculate last interval length */ | |
883 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); | |
884 | entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); | |
885 | ||
886 | if (entry == NULL) { | |
59348b19 | 887 | DCCP_BUG("out of memory - can not allocate entry"); |
ae6706f0 | 888 | return; |
66a377c5 IM |
889 | } |
890 | ||
891 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); | |
892 | ||
893 | tail = hcrx->ccid3hcrx_li_hist.prev; | |
894 | list_del(tail); | |
895 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); | |
896 | ||
897 | /* Create the newest interval */ | |
898 | entry->dccplih_seqno = seq_loss; | |
899 | entry->dccplih_interval = seq_temp; | |
900 | entry->dccplih_win_count = win_loss; | |
901 | } | |
7c657876 ACM |
902 | } |
903 | ||
66a377c5 IM |
904 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
905 | struct dccp_rx_hist_entry *packet) | |
7c657876 | 906 | { |
59725dc2 | 907 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
66a377c5 IM |
908 | struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
909 | u64 seqno = packet->dccphrx_seqno; | |
910 | u64 tmp_seqno; | |
911 | int loss = 0; | |
912 | u8 ccval; | |
913 | ||
914 | ||
915 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
916 | ||
917 | if (!rx_hist || | |
918 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
919 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
920 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
921 | goto detect_out; | |
922 | } | |
923 | ||
7c657876 | 924 | |
66a377c5 IM |
925 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
926 | > TFRC_RECV_NUM_LATE_LOSS) { | |
927 | loss = 1; | |
928 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, | |
929 | hcrx->ccid3hcrx_ccval_nonloss); | |
930 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
931 | dccp_inc_seqno(&tmp_seqno); | |
932 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
933 | dccp_inc_seqno(&tmp_seqno); | |
934 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, | |
935 | tmp_seqno, &ccval)) { | |
936 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
937 | hcrx->ccid3hcrx_ccval_nonloss = ccval; | |
938 | dccp_inc_seqno(&tmp_seqno); | |
939 | } | |
940 | } | |
941 | ||
942 | /* FIXME - this code could be simplified with above while */ | |
943 | /* but works at moment */ | |
944 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
945 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
946 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
947 | } | |
948 | ||
949 | detect_out: | |
950 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, | |
951 | &hcrx->ccid3hcrx_li_hist, packet, | |
952 | hcrx->ccid3hcrx_seqno_nonloss); | |
953 | return loss; | |
7c657876 ACM |
954 | } |
955 | ||
7c657876 ACM |
956 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
957 | { | |
59725dc2 | 958 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
4fded33b | 959 | const struct dccp_options_received *opt_recv; |
8c60f3fa | 960 | struct dccp_rx_hist_entry *packet; |
7c657876 | 961 | struct timeval now; |
66a377c5 | 962 | u32 p_prev, rtt_prev, r_sample, t_elapsed; |
78ad713d | 963 | int loss, payload_size; |
1f2333ae | 964 | |
59348b19 | 965 | BUG_ON(hcrx == NULL); |
7c657876 | 966 | |
59725dc2 | 967 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
4fded33b | 968 | |
7c657876 ACM |
969 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
970 | case DCCP_PKT_ACK: | |
971 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
972 | return; | |
973 | case DCCP_PKT_DATAACK: | |
4fded33b | 974 | if (opt_recv->dccpor_timestamp_echo == 0) |
7c657876 | 975 | break; |
66a377c5 | 976 | rtt_prev = hcrx->ccid3hcrx_rtt; |
b0e56780 | 977 | dccp_timestamp(sk, &now); |
b3a3077d ACM |
978 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
979 | r_sample = timeval_usecs(&now); | |
980 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; | |
981 | ||
982 | if (unlikely(r_sample <= t_elapsed)) | |
59348b19 GR |
983 | DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", |
984 | r_sample, t_elapsed); | |
b3a3077d ACM |
985 | else |
986 | r_sample -= t_elapsed; | |
987 | ||
988 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
989 | hcrx->ccid3hcrx_rtt = r_sample; | |
990 | else | |
991 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + | |
992 | r_sample / 10; | |
993 | ||
66a377c5 IM |
994 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
995 | ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", | |
4fded33b ACM |
996 | dccp_role(sk), hcrx->ccid3hcrx_rtt, |
997 | opt_recv->dccpor_elapsed_time); | |
7c657876 ACM |
998 | break; |
999 | case DCCP_PKT_DATA: | |
1000 | break; | |
59d203f9 | 1001 | default: /* We're not interested in other packet types, move along */ |
7c657876 ACM |
1002 | return; |
1003 | } | |
1004 | ||
b0e56780 | 1005 | packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, |
8c60f3fa | 1006 | skb, SLAB_ATOMIC); |
59d203f9 | 1007 | if (unlikely(packet == NULL)) { |
59348b19 GR |
1008 | DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " |
1009 | "to history, consider it lost!\n", dccp_role(sk), sk); | |
7c657876 ACM |
1010 | return; |
1011 | } | |
1012 | ||
66a377c5 | 1013 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
7c657876 ACM |
1014 | |
1015 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) | |
1016 | return; | |
1017 | ||
78ad713d GR |
1018 | payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; |
1019 | ccid3_hc_rx_update_s(hcrx, payload_size); | |
1020 | ||
7c657876 ACM |
1021 | switch (hcrx->ccid3hcrx_state) { |
1022 | case TFRC_RSTATE_NO_DATA: | |
1f2333ae ACM |
1023 | ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " |
1024 | "feedback\n", | |
1025 | dccp_role(sk), sk, | |
1026 | dccp_state_name(sk->sk_state), skb); | |
7c657876 ACM |
1027 | ccid3_hc_rx_send_feedback(sk); |
1028 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); | |
1029 | return; | |
1030 | case TFRC_RSTATE_DATA: | |
78ad713d | 1031 | hcrx->ccid3hcrx_bytes_recv += payload_size; |
66a377c5 | 1032 | if (loss) |
b6ee3d4a ACM |
1033 | break; |
1034 | ||
b0e56780 | 1035 | dccp_timestamp(sk, &now); |
b6ee3d4a ACM |
1036 | if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= |
1037 | hcrx->ccid3hcrx_rtt) { | |
1038 | hcrx->ccid3hcrx_tstamp_last_ack = now; | |
1039 | ccid3_hc_rx_send_feedback(sk); | |
7c657876 | 1040 | } |
b6ee3d4a | 1041 | return; |
59348b19 GR |
1042 | case TFRC_RSTATE_TERM: |
1043 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
1044 | return; |
1045 | } | |
1046 | ||
1047 | /* Dealing with packet loss */ | |
4fded33b ACM |
1048 | ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", |
1049 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); | |
7c657876 | 1050 | |
7c657876 ACM |
1051 | p_prev = hcrx->ccid3hcrx_p; |
1052 | ||
1053 | /* Calculate loss event rate */ | |
c0996660 IM |
1054 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
1055 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); | |
1056 | ||
7c657876 | 1057 | /* Scaling up by 1000000 as fixed decimal */ |
c0996660 IM |
1058 | if (i_mean != 0) |
1059 | hcrx->ccid3hcrx_p = 1000000 / i_mean; | |
59348b19 GR |
1060 | } else |
1061 | DCCP_BUG("empty loss history"); | |
7c657876 ACM |
1062 | |
1063 | if (hcrx->ccid3hcrx_p > p_prev) { | |
1064 | ccid3_hc_rx_send_feedback(sk); | |
1065 | return; | |
1066 | } | |
1067 | } | |
1068 | ||
91f0ebf7 | 1069 | static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) |
7c657876 | 1070 | { |
91f0ebf7 | 1071 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
7c657876 ACM |
1072 | |
1073 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
1074 | ||
7c657876 ACM |
1075 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; |
1076 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); | |
ae6706f0 | 1077 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
b0e56780 | 1078 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
954ee31f | 1079 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
78ad713d | 1080 | hcrx->ccid3hcrx_s = 0; |
954ee31f | 1081 | hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ |
7c657876 ACM |
1082 | return 0; |
1083 | } | |
1084 | ||
1085 | static void ccid3_hc_rx_exit(struct sock *sk) | |
1086 | { | |
59725dc2 | 1087 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 1088 | |
59d203f9 | 1089 | BUG_ON(hcrx == NULL); |
7c657876 ACM |
1090 | |
1091 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); | |
1092 | ||
1093 | /* Empty packet history */ | |
8c60f3fa | 1094 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
7c657876 ACM |
1095 | |
1096 | /* Empty loss interval history */ | |
ae6706f0 | 1097 | dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); |
7c657876 ACM |
1098 | } |
1099 | ||
2babe1f6 ACM |
1100 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
1101 | { | |
59725dc2 | 1102 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
2babe1f6 | 1103 | |
59c2353d ACM |
1104 | /* Listen socks doesn't have a private CCID block */ |
1105 | if (sk->sk_state == DCCP_LISTEN) | |
1106 | return; | |
1107 | ||
59d203f9 | 1108 | BUG_ON(hcrx == NULL); |
2babe1f6 ACM |
1109 | |
1110 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; | |
1111 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; | |
1112 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; | |
1113 | } | |
1114 | ||
1115 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) | |
1116 | { | |
59725dc2 | 1117 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
2babe1f6 | 1118 | |
59c2353d ACM |
1119 | /* Listen socks doesn't have a private CCID block */ |
1120 | if (sk->sk_state == DCCP_LISTEN) | |
1121 | return; | |
1122 | ||
59d203f9 | 1123 | BUG_ON(hctx == NULL); |
2babe1f6 ACM |
1124 | |
1125 | info->tcpi_rto = hctx->ccid3hctx_t_rto; | |
1126 | info->tcpi_rtt = hctx->ccid3hctx_rtt; | |
1127 | } | |
1128 | ||
88f964db ACM |
1129 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
1130 | u32 __user *optval, int __user *optlen) | |
1131 | { | |
1132 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); | |
1133 | const void *val; | |
1134 | ||
1135 | /* Listen socks doesn't have a private CCID block */ | |
1136 | if (sk->sk_state == DCCP_LISTEN) | |
1137 | return -EINVAL; | |
1138 | ||
1139 | switch (optname) { | |
1140 | case DCCP_SOCKOPT_CCID_RX_INFO: | |
1141 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) | |
1142 | return -EINVAL; | |
1143 | len = sizeof(hcrx->ccid3hcrx_tfrc); | |
1144 | val = &hcrx->ccid3hcrx_tfrc; | |
1145 | break; | |
1146 | default: | |
1147 | return -ENOPROTOOPT; | |
1148 | } | |
1149 | ||
1150 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1151 | return -EFAULT; | |
1152 | ||
1153 | return 0; | |
1154 | } | |
1155 | ||
1156 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, | |
1157 | u32 __user *optval, int __user *optlen) | |
1158 | { | |
1159 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
1160 | const void *val; | |
1161 | ||
1162 | /* Listen socks doesn't have a private CCID block */ | |
1163 | if (sk->sk_state == DCCP_LISTEN) | |
1164 | return -EINVAL; | |
1165 | ||
1166 | switch (optname) { | |
1167 | case DCCP_SOCKOPT_CCID_TX_INFO: | |
1168 | if (len < sizeof(hctx->ccid3hctx_tfrc)) | |
1169 | return -EINVAL; | |
1170 | len = sizeof(hctx->ccid3hctx_tfrc); | |
1171 | val = &hctx->ccid3hctx_tfrc; | |
1172 | break; | |
1173 | default: | |
1174 | return -ENOPROTOOPT; | |
1175 | } | |
1176 | ||
1177 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1178 | return -EFAULT; | |
1179 | ||
1180 | return 0; | |
1181 | } | |
1182 | ||
91f0ebf7 | 1183 | static struct ccid_operations ccid3 = { |
3dd9a7c3 | 1184 | .ccid_id = DCCPC_CCID3, |
7c657876 ACM |
1185 | .ccid_name = "ccid3", |
1186 | .ccid_owner = THIS_MODULE, | |
91f0ebf7 | 1187 | .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), |
7c657876 ACM |
1188 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
1189 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, | |
1190 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, | |
1191 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, | |
1192 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, | |
1193 | .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, | |
1194 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, | |
91f0ebf7 | 1195 | .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), |
7c657876 ACM |
1196 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
1197 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, | |
1198 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, | |
1199 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, | |
2babe1f6 ACM |
1200 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
1201 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, | |
88f964db ACM |
1202 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
1203 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, | |
7c657876 ACM |
1204 | }; |
1205 | ||
56724aa4 | 1206 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
1207 | module_param(ccid3_debug, int, 0444); |
1208 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); | |
56724aa4 | 1209 | #endif |
7c657876 ACM |
1210 | |
1211 | static __init int ccid3_module_init(void) | |
1212 | { | |
8c60f3fa | 1213 | int rc = -ENOBUFS; |
7c657876 | 1214 | |
8c60f3fa ACM |
1215 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
1216 | if (ccid3_rx_hist == NULL) | |
7c657876 ACM |
1217 | goto out; |
1218 | ||
8c60f3fa ACM |
1219 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
1220 | if (ccid3_tx_hist == NULL) | |
1221 | goto out_free_rx; | |
7c657876 | 1222 | |
ae6706f0 ACM |
1223 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
1224 | if (ccid3_li_hist == NULL) | |
8c60f3fa | 1225 | goto out_free_tx; |
7c657876 ACM |
1226 | |
1227 | rc = ccid_register(&ccid3); | |
1228 | if (rc != 0) | |
1229 | goto out_free_loss_interval_history; | |
7c657876 ACM |
1230 | out: |
1231 | return rc; | |
8c60f3fa | 1232 | |
7c657876 | 1233 | out_free_loss_interval_history: |
ae6706f0 ACM |
1234 | dccp_li_hist_delete(ccid3_li_hist); |
1235 | ccid3_li_hist = NULL; | |
8c60f3fa ACM |
1236 | out_free_tx: |
1237 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1238 | ccid3_tx_hist = NULL; | |
1239 | out_free_rx: | |
1240 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1241 | ccid3_rx_hist = NULL; | |
7c657876 ACM |
1242 | goto out; |
1243 | } | |
1244 | module_init(ccid3_module_init); | |
1245 | ||
1246 | static __exit void ccid3_module_exit(void) | |
1247 | { | |
1248 | ccid_unregister(&ccid3); | |
1249 | ||
8c60f3fa ACM |
1250 | if (ccid3_tx_hist != NULL) { |
1251 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1252 | ccid3_tx_hist = NULL; | |
7c657876 | 1253 | } |
8c60f3fa ACM |
1254 | if (ccid3_rx_hist != NULL) { |
1255 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1256 | ccid3_rx_hist = NULL; | |
7c657876 | 1257 | } |
ae6706f0 ACM |
1258 | if (ccid3_li_hist != NULL) { |
1259 | dccp_li_hist_delete(ccid3_li_hist); | |
1260 | ccid3_li_hist = NULL; | |
7c657876 ACM |
1261 | } |
1262 | } | |
1263 | module_exit(ccid3_module_exit); | |
1264 | ||
e6bccd35 | 1265 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
1f2333ae | 1266 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
7c657876 ACM |
1267 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
1268 | MODULE_LICENSE("GPL"); | |
1269 | MODULE_ALIAS("net-dccp-ccid-3"); |