Commit | Line | Data |
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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 | */ | |
a79ef76f GR |
131 | static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now) |
132 | ||
7c657876 | 133 | { |
59725dc2 | 134 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
17893bc1 | 135 | const __u32 old_x = hctx->ccid3hctx_x; |
7c657876 | 136 | |
1f2333ae ACM |
137 | /* To avoid large error in calcX */ |
138 | if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { | |
36729c1a ACM |
139 | hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, |
140 | hctx->ccid3hctx_rtt, | |
141 | hctx->ccid3hctx_p); | |
a79ef76f GR |
142 | hctx->ccid3hctx_x = max_t(u32, min(hctx->ccid3hctx_x_calc, |
143 | hctx->ccid3hctx_x_recv * 2), | |
144 | hctx->ccid3hctx_s / TFRC_T_MBI); | |
145 | ||
146 | } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) >= | |
147 | hctx->ccid3hctx_rtt) { | |
148 | hctx->ccid3hctx_x = max(min(hctx->ccid3hctx_x_recv, | |
149 | hctx->ccid3hctx_x ) * 2, | |
150 | usecs_div(hctx->ccid3hctx_s, | |
151 | hctx->ccid3hctx_rtt) ); | |
152 | hctx->ccid3hctx_t_ld = *now; | |
153 | } else | |
154 | ccid3_pr_debug("Not changing X\n"); | |
b6ee3d4a | 155 | |
17893bc1 GR |
156 | if (hctx->ccid3hctx_x != old_x) |
157 | ccid3_update_send_time(hctx); | |
7c657876 ACM |
158 | } |
159 | ||
78ad713d GR |
160 | /* |
161 | * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) | |
162 | * @len: DCCP packet payload size in bytes | |
163 | */ | |
164 | static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) | |
165 | { | |
166 | if (unlikely(len == 0)) | |
167 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); | |
168 | else | |
169 | hctx->ccid3hctx_s = hctx->ccid3hctx_s == 0 ? len : | |
170 | (9 * hctx->ccid3hctx_s + len) / 10; | |
171 | /* | |
172 | * Note: We could do a potential optimisation here - when `s' changes, | |
173 | * recalculate sending rate and consequently t_ipi, t_delta, and | |
174 | * t_now. This is however non-standard, and the benefits are not | |
175 | * clear, so it is currently left out. | |
176 | */ | |
177 | } | |
178 | ||
7c657876 ACM |
179 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) |
180 | { | |
181 | struct sock *sk = (struct sock *)data; | |
59725dc2 | 182 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
2a1fda6f | 183 | unsigned long t_nfb = USEC_PER_SEC / 5; |
7c657876 ACM |
184 | |
185 | bh_lock_sock(sk); | |
186 | if (sock_owned_by_user(sk)) { | |
187 | /* Try again later. */ | |
188 | /* XXX: set some sensible MIB */ | |
48e03eee | 189 | goto restart_timer; |
7c657876 ACM |
190 | } |
191 | ||
192 | ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, | |
193 | ccid3_tx_state_name(hctx->ccid3hctx_state)); | |
194 | ||
7c657876 | 195 | switch (hctx->ccid3hctx_state) { |
7c657876 | 196 | case TFRC_SSTATE_NO_FBACK: |
a79ef76f GR |
197 | /* RFC 3448, 4.4: Halve send rate directly */ |
198 | hctx->ccid3hctx_x = min_t(u32, hctx->ccid3hctx_x / 2, | |
199 | hctx->ccid3hctx_s / TFRC_T_MBI); | |
7c657876 | 200 | |
1f2333ae ACM |
201 | ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " |
202 | "bytes/s\n", | |
203 | dccp_role(sk), sk, | |
204 | ccid3_tx_state_name(hctx->ccid3hctx_state), | |
7c657876 | 205 | hctx->ccid3hctx_x); |
48e03eee GR |
206 | /* The value of R is still undefined and so we can not recompute |
207 | * the timout value. Keep initial value as per [RFC 4342, 5]. */ | |
2a1fda6f | 208 | t_nfb = TFRC_INITIAL_TIMEOUT; |
17893bc1 | 209 | ccid3_update_send_time(hctx); |
7c657876 ACM |
210 | break; |
211 | case TFRC_SSTATE_FBACK: | |
1f2333ae ACM |
212 | /* |
213 | * Check if IDLE since last timeout and recv rate is less than | |
214 | * 4 packets per RTT | |
215 | */ | |
1f2333ae | 216 | if (!hctx->ccid3hctx_idle || |
6b5e633a ACM |
217 | (hctx->ccid3hctx_x_recv >= |
218 | 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { | |
a79ef76f GR |
219 | struct timeval now; |
220 | ||
1f2333ae ACM |
221 | ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", |
222 | dccp_role(sk), sk, | |
7c657876 ACM |
223 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
224 | /* Halve sending rate */ | |
225 | ||
226 | /* If (X_calc > 2 * X_recv) | |
227 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); | |
228 | * Else | |
229 | * X_recv = X_calc / 4; | |
230 | */ | |
1f2333ae ACM |
231 | BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && |
232 | hctx->ccid3hctx_x_calc == 0); | |
7c657876 ACM |
233 | |
234 | /* check also if p is zero -> x_calc is infinity? */ | |
235 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P || | |
236 | hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) | |
237 | hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, | |
a79ef76f | 238 | hctx->ccid3hctx_s / (2 * TFRC_T_MBI)); |
7c657876 ACM |
239 | else |
240 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; | |
241 | ||
242 | /* Update sending rate */ | |
a79ef76f GR |
243 | dccp_timestamp(sk, &now); |
244 | ccid3_hc_tx_update_x(sk, &now); | |
7c657876 | 245 | } |
6b5e633a ACM |
246 | /* |
247 | * Schedule no feedback timer to expire in | |
2a1fda6f | 248 | * max(4 * R, 2 * s/X) = max(4 * R, 2 * t_ipi) |
6b5e633a | 249 | */ |
2a1fda6f | 250 | t_nfb = max(4 * hctx->ccid3hctx_rtt, 2 * hctx->ccid3hctx_t_ipi); |
7c657876 | 251 | break; |
59348b19 GR |
252 | case TFRC_SSTATE_NO_SENT: |
253 | DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); | |
254 | /* fall through */ | |
255 | case TFRC_SSTATE_TERM: | |
7c657876 ACM |
256 | goto out; |
257 | } | |
258 | ||
7c657876 | 259 | hctx->ccid3hctx_idle = 1; |
48e03eee GR |
260 | |
261 | restart_timer: | |
262 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
2a1fda6f | 263 | jiffies + usecs_to_jiffies(t_nfb)); |
7c657876 ACM |
264 | out: |
265 | bh_unlock_sock(sk); | |
266 | sock_put(sk); | |
267 | } | |
268 | ||
7da7f456 GR |
269 | /* |
270 | * returns | |
271 | * > 0: delay (in msecs) that should pass before actually sending | |
272 | * = 0: can send immediately | |
273 | * < 0: error condition; do not send packet | |
274 | */ | |
6b57c93d | 275 | static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
276 | { |
277 | struct dccp_sock *dp = dccp_sk(sk); | |
59725dc2 | 278 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
8c60f3fa | 279 | struct dccp_tx_hist_entry *new_packet; |
7c657876 | 280 | struct timeval now; |
27258ee5 | 281 | long delay; |
7c657876 | 282 | |
59348b19 | 283 | BUG_ON(hctx == NULL); |
1f2333ae | 284 | |
7c657876 | 285 | /* |
da335baf GR |
286 | * This function is called only for Data and DataAck packets. Sending |
287 | * zero-sized Data(Ack)s is theoretically possible, but for congestion | |
288 | * control this case is pathological - ignore it. | |
7c657876 | 289 | */ |
6b57c93d | 290 | if (unlikely(skb->len == 0)) |
da335baf | 291 | return -EBADMSG; |
7c657876 ACM |
292 | |
293 | /* See if last packet allocated was not sent */ | |
8c60f3fa ACM |
294 | new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
295 | if (new_packet == NULL || new_packet->dccphtx_sent) { | |
1f2333ae ACM |
296 | new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, |
297 | SLAB_ATOMIC); | |
7c657876 | 298 | |
59d203f9 | 299 | if (unlikely(new_packet == NULL)) { |
59348b19 GR |
300 | DCCP_WARN("%s, sk=%p, not enough mem to add to history," |
301 | "send refused\n", dccp_role(sk), sk); | |
7da7f456 | 302 | return -ENOBUFS; |
7c657876 ACM |
303 | } |
304 | ||
8c60f3fa | 305 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); |
7c657876 ACM |
306 | } |
307 | ||
b0e56780 | 308 | dccp_timestamp(sk, &now); |
7c657876 ACM |
309 | |
310 | switch (hctx->ccid3hctx_state) { | |
311 | case TFRC_SSTATE_NO_SENT: | |
1f2333ae ACM |
312 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
313 | jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); | |
7c657876 ACM |
314 | hctx->ccid3hctx_last_win_count = 0; |
315 | hctx->ccid3hctx_t_last_win_count = now; | |
316 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); | |
7c657876 | 317 | |
78ad713d | 318 | /* Set initial sending rate to 1 packet per second */ |
6b57c93d | 319 | ccid3_hc_tx_update_s(hctx, skb->len); |
78ad713d GR |
320 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; |
321 | ||
90feeb95 GR |
322 | /* First timeout, according to [RFC 3448, 4.2], is 1 second */ |
323 | hctx->ccid3hctx_t_ipi = USEC_PER_SEC; | |
324 | /* Initial delta: minimum of 0.5 sec and t_gran/2 */ | |
325 | hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; | |
326 | ||
327 | /* Set t_0 for initial packet */ | |
7c657876 | 328 | hctx->ccid3hctx_t_nom = now; |
7c657876 ACM |
329 | break; |
330 | case TFRC_SSTATE_NO_FBACK: | |
331 | case TFRC_SSTATE_FBACK: | |
91cf5a17 GR |
332 | delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); |
333 | /* | |
334 | * Scheduling of packet transmissions [RFC 3448, 4.6] | |
335 | * | |
336 | * if (t_now > t_nom - delta) | |
337 | * // send the packet now | |
338 | * else | |
339 | * // send the packet in (t_nom - t_now) milliseconds. | |
340 | */ | |
7da7f456 GR |
341 | if (delay >= hctx->ccid3hctx_delta) |
342 | return delay / 1000L; | |
7c657876 | 343 | break; |
59348b19 GR |
344 | case TFRC_SSTATE_TERM: |
345 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7da7f456 | 346 | return -EINVAL; |
7c657876 ACM |
347 | } |
348 | ||
7da7f456 GR |
349 | /* prepare to send now (add options etc.) */ |
350 | dp->dccps_hc_tx_insert_options = 1; | |
351 | new_packet->dccphtx_ccval = DCCP_SKB_CB(skb)->dccpd_ccval = | |
352 | hctx->ccid3hctx_last_win_count; | |
353 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); | |
354 | ||
355 | return 0; | |
7c657876 ACM |
356 | } |
357 | ||
6b57c93d | 358 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len) |
7c657876 | 359 | { |
59725dc2 ACM |
360 | const struct dccp_sock *dp = dccp_sk(sk); |
361 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 | 362 | struct timeval now; |
6b57c93d GR |
363 | unsigned long quarter_rtt; |
364 | struct dccp_tx_hist_entry *packet; | |
7c657876 | 365 | |
59348b19 | 366 | BUG_ON(hctx == NULL); |
7c657876 | 367 | |
b0e56780 | 368 | dccp_timestamp(sk, &now); |
7c657876 | 369 | |
6b57c93d | 370 | ccid3_hc_tx_update_s(hctx, len); |
7c657876 | 371 | |
6b57c93d GR |
372 | packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
373 | if (unlikely(packet == NULL)) { | |
374 | DCCP_WARN("packet doesn't exist in history!\n"); | |
375 | return; | |
376 | } | |
377 | if (unlikely(packet->dccphtx_sent)) { | |
378 | DCCP_WARN("no unsent packet in history!\n"); | |
379 | return; | |
380 | } | |
381 | packet->dccphtx_tstamp = now; | |
382 | packet->dccphtx_seqno = dp->dccps_gss; | |
383 | /* | |
384 | * Check if win_count have changed | |
385 | * Algorithm in "8.1. Window Counter Value" in RFC 4342. | |
386 | */ | |
387 | quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); | |
388 | if (likely(hctx->ccid3hctx_rtt > 8)) | |
389 | quarter_rtt /= hctx->ccid3hctx_rtt / 4; | |
78ad713d | 390 | |
6b57c93d GR |
391 | if (quarter_rtt > 0) { |
392 | hctx->ccid3hctx_t_last_win_count = now; | |
393 | hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + | |
394 | min_t(unsigned long, quarter_rtt, 5)) % 16; | |
395 | ccid3_pr_debug("%s, sk=%p, window changed from " | |
396 | "%u to %u!\n", | |
397 | dccp_role(sk), sk, | |
398 | packet->dccphtx_ccval, | |
399 | hctx->ccid3hctx_last_win_count); | |
400 | } | |
1f2333ae | 401 | |
6b57c93d GR |
402 | hctx->ccid3hctx_idle = 0; |
403 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; | |
404 | packet->dccphtx_sent = 1; | |
7c657876 ACM |
405 | } |
406 | ||
407 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) | |
408 | { | |
59725dc2 ACM |
409 | const struct dccp_sock *dp = dccp_sk(sk); |
410 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 | 411 | struct ccid3_options_received *opt_recv; |
8c60f3fa | 412 | struct dccp_tx_hist_entry *packet; |
b0e56780 | 413 | struct timeval now; |
2a1fda6f | 414 | unsigned long t_nfb; |
1bc09869 | 415 | u32 t_elapsed; |
7c657876 ACM |
416 | u32 pinv; |
417 | u32 x_recv; | |
418 | u32 r_sample; | |
1f2333ae | 419 | |
59348b19 | 420 | BUG_ON(hctx == NULL); |
7c657876 ACM |
421 | |
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)) | |
425 | return; | |
426 | ||
427 | opt_recv = &hctx->ccid3hctx_options_received; | |
428 | ||
1a28599a | 429 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; |
7c657876 ACM |
430 | x_recv = opt_recv->ccid3or_receive_rate; |
431 | pinv = opt_recv->ccid3or_loss_event_rate; | |
432 | ||
433 | switch (hctx->ccid3hctx_state) { | |
7c657876 ACM |
434 | case TFRC_SSTATE_NO_FBACK: |
435 | case TFRC_SSTATE_FBACK: | |
436 | /* Calculate new round trip sample by | |
437 | * R_sample = (now - t_recvdata) - t_delay */ | |
438 | /* get t_recvdata from history */ | |
8c60f3fa ACM |
439 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
440 | DCCP_SKB_CB(skb)->dccpd_ack_seq); | |
59d203f9 | 441 | if (unlikely(packet == NULL)) { |
59348b19 GR |
442 | DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist " |
443 | "in history!\n", dccp_role(sk), sk, | |
59d203f9 | 444 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
59348b19 | 445 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
7c657876 ACM |
446 | return; |
447 | } | |
448 | ||
449 | /* Update RTT */ | |
b0e56780 ACM |
450 | dccp_timestamp(sk, &now); |
451 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); | |
1a28599a | 452 | if (unlikely(r_sample <= t_elapsed)) |
59348b19 GR |
453 | DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n", |
454 | r_sample, t_elapsed); | |
1a28599a ACM |
455 | else |
456 | r_sample -= t_elapsed; | |
7c657876 ACM |
457 | |
458 | /* Update RTT estimate by | |
459 | * If (No feedback recv) | |
460 | * R = R_sample; | |
461 | * Else | |
462 | * R = q * R + (1 - q) * R_sample; | |
463 | * | |
464 | * q is a constant, RFC 3448 recomments 0.9 | |
465 | */ | |
466 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { | |
a79ef76f GR |
467 | /* Use Larger Initial Windows [RFC 4342, sec. 5] |
468 | * We deviate in that we use `s' instead of `MSS'. */ | |
469 | u16 w_init = max( 4 * hctx->ccid3hctx_s, | |
470 | max(2 * hctx->ccid3hctx_s, 4380)); | |
471 | hctx->ccid3hctx_rtt = r_sample; | |
472 | hctx->ccid3hctx_x = usecs_div(w_init, r_sample); | |
473 | hctx->ccid3hctx_t_ld = now; | |
474 | ||
475 | ccid3_update_send_time(hctx); | |
7c657876 | 476 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); |
a79ef76f | 477 | } else { |
1f2333ae ACM |
478 | hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + |
479 | r_sample / 10; | |
a79ef76f GR |
480 | ccid3_hc_tx_update_x(sk, &now); |
481 | } | |
7c657876 | 482 | |
1f2333ae ACM |
483 | ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " |
484 | "r_sample=%us\n", dccp_role(sk), sk, | |
485 | hctx->ccid3hctx_rtt, r_sample); | |
7c657876 | 486 | |
7c657876 | 487 | /* Update receive rate */ |
1f2333ae | 488 | hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ |
7c657876 ACM |
489 | |
490 | /* Update loss event rate */ | |
491 | if (pinv == ~0 || pinv == 0) | |
492 | hctx->ccid3hctx_p = 0; | |
493 | else { | |
494 | hctx->ccid3hctx_p = 1000000 / pinv; | |
495 | ||
496 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { | |
497 | hctx->ccid3hctx_p = TFRC_SMALLEST_P; | |
1f2333ae ACM |
498 | ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", |
499 | dccp_role(sk), sk); | |
7c657876 ACM |
500 | } |
501 | } | |
502 | ||
503 | /* unschedule no feedback timer */ | |
504 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
505 | ||
7c657876 | 506 | /* remove all packets older than the one acked from history */ |
8c60f3fa ACM |
507 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
508 | &hctx->ccid3hctx_hist, packet); | |
c530cfb1 ACM |
509 | /* |
510 | * As we have calculated new ipi, delta, t_nom it is possible that | |
5d0dbc4a | 511 | * we now can send a packet, so wake up dccp_wait_for_ccid |
c530cfb1 ACM |
512 | */ |
513 | sk->sk_write_space(sk); | |
8c60f3fa | 514 | |
5d0dbc4a GR |
515 | /* Update timeout interval. We use the alternative variant of |
516 | * [RFC 3448, 3.1] which sets the upper bound of t_rto to one | |
517 | * second, as it is suggested for TCP (see RFC 2988, 2.4). */ | |
518 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, | |
519 | USEC_PER_SEC ); | |
1f2333ae ACM |
520 | /* |
521 | * Schedule no feedback timer to expire in | |
2a1fda6f | 522 | * max(4 * R, 2 * s/X) = max(4 * R, 2 * t_ipi) |
1f2333ae | 523 | */ |
2a1fda6f | 524 | t_nfb = max(4 * hctx->ccid3hctx_rtt, 2 * hctx->ccid3hctx_t_ipi); |
6b5e633a | 525 | |
1f2333ae ACM |
526 | ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " |
527 | "expire in %lu jiffies (%luus)\n", | |
528 | dccp_role(sk), sk, | |
2a1fda6f | 529 | usecs_to_jiffies(t_nfb), t_nfb); |
7c657876 ACM |
530 | |
531 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
2a1fda6f | 532 | jiffies + usecs_to_jiffies(t_nfb)); |
7c657876 ACM |
533 | |
534 | /* set idle flag */ | |
535 | hctx->ccid3hctx_idle = 1; | |
536 | break; | |
5e19e3fc GR |
537 | case TFRC_SSTATE_NO_SENT: |
538 | DCCP_WARN("Illegal ACK received - no packet has been sent\n"); | |
539 | /* fall through */ | |
540 | case TFRC_SSTATE_TERM: /* ignore feedback when closing */ | |
7c657876 ACM |
541 | break; |
542 | } | |
543 | } | |
544 | ||
2d0817d1 | 545 | static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 546 | { |
59d203f9 | 547 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 548 | |
59d203f9 ACM |
549 | BUG_ON(hctx == NULL); |
550 | ||
2d0817d1 ACM |
551 | if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) |
552 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; | |
553 | return 0; | |
7c657876 ACM |
554 | } |
555 | ||
556 | static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, | |
1f2333ae ACM |
557 | unsigned char len, u16 idx, |
558 | unsigned char *value) | |
7c657876 ACM |
559 | { |
560 | int rc = 0; | |
59725dc2 ACM |
561 | const struct dccp_sock *dp = dccp_sk(sk); |
562 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 ACM |
563 | struct ccid3_options_received *opt_recv; |
564 | ||
59d203f9 | 565 | BUG_ON(hctx == NULL); |
7c657876 ACM |
566 | |
567 | opt_recv = &hctx->ccid3hctx_options_received; | |
568 | ||
569 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { | |
570 | opt_recv->ccid3or_seqno = dp->dccps_gsr; | |
571 | opt_recv->ccid3or_loss_event_rate = ~0; | |
572 | opt_recv->ccid3or_loss_intervals_idx = 0; | |
573 | opt_recv->ccid3or_loss_intervals_len = 0; | |
574 | opt_recv->ccid3or_receive_rate = 0; | |
575 | } | |
576 | ||
577 | switch (option) { | |
578 | case TFRC_OPT_LOSS_EVENT_RATE: | |
59d203f9 | 579 | if (unlikely(len != 4)) { |
59348b19 GR |
580 | DCCP_WARN("%s, sk=%p, invalid len %d " |
581 | "for TFRC_OPT_LOSS_EVENT_RATE\n", | |
582 | dccp_role(sk), sk, len); | |
7c657876 ACM |
583 | rc = -EINVAL; |
584 | } else { | |
60fe62e7 | 585 | opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
586 | ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", |
587 | dccp_role(sk), sk, | |
588 | opt_recv->ccid3or_loss_event_rate); | |
589 | } | |
590 | break; | |
591 | case TFRC_OPT_LOSS_INTERVALS: | |
592 | opt_recv->ccid3or_loss_intervals_idx = idx; | |
593 | opt_recv->ccid3or_loss_intervals_len = len; | |
594 | ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", | |
595 | dccp_role(sk), sk, | |
596 | opt_recv->ccid3or_loss_intervals_idx, | |
597 | opt_recv->ccid3or_loss_intervals_len); | |
598 | break; | |
599 | case TFRC_OPT_RECEIVE_RATE: | |
59d203f9 | 600 | if (unlikely(len != 4)) { |
59348b19 GR |
601 | DCCP_WARN("%s, sk=%p, invalid len %d " |
602 | "for TFRC_OPT_RECEIVE_RATE\n", | |
603 | dccp_role(sk), sk, len); | |
7c657876 ACM |
604 | rc = -EINVAL; |
605 | } else { | |
60fe62e7 | 606 | opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
607 | ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", |
608 | dccp_role(sk), sk, | |
609 | opt_recv->ccid3or_receive_rate); | |
610 | } | |
611 | break; | |
612 | } | |
613 | ||
614 | return rc; | |
615 | } | |
616 | ||
91f0ebf7 | 617 | static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) |
7c657876 | 618 | { |
91f0ebf7 | 619 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
7c657876 | 620 | |
78ad713d | 621 | hctx->ccid3hctx_s = 0; |
7c657876 ACM |
622 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
623 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); | |
aa5d7df3 ACM |
624 | |
625 | hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; | |
626 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; | |
7c657876 ACM |
627 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
628 | ||
629 | return 0; | |
630 | } | |
631 | ||
632 | static void ccid3_hc_tx_exit(struct sock *sk) | |
633 | { | |
59725dc2 | 634 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 635 | |
7c657876 ACM |
636 | BUG_ON(hctx == NULL); |
637 | ||
638 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); | |
639 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
640 | ||
641 | /* Empty packet history */ | |
8c60f3fa | 642 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
7c657876 ACM |
643 | } |
644 | ||
645 | /* | |
646 | * RX Half Connection methods | |
647 | */ | |
648 | ||
56724aa4 | 649 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
650 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
651 | { | |
652 | static char *ccid3_rx_state_names[] = { | |
653 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", | |
654 | [TFRC_RSTATE_DATA] = "DATA", | |
655 | [TFRC_RSTATE_TERM] = "TERM", | |
656 | }; | |
657 | ||
658 | return ccid3_rx_state_names[state]; | |
659 | } | |
660 | #endif | |
661 | ||
c25a18ba ACM |
662 | static void ccid3_hc_rx_set_state(struct sock *sk, |
663 | enum ccid3_hc_rx_states state) | |
7c657876 | 664 | { |
59725dc2 | 665 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 ACM |
666 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
667 | ||
668 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
669 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
670 | ccid3_rx_state_name(state)); | |
7c657876 ACM |
671 | WARN_ON(state == oldstate); |
672 | hcrx->ccid3hcrx_state = state; | |
673 | } | |
674 | ||
78ad713d GR |
675 | static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) |
676 | { | |
677 | if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ | |
678 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); | |
679 | else | |
680 | hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : | |
681 | (9 * hcrx->ccid3hcrx_s + len) / 10; | |
682 | } | |
683 | ||
7c657876 ACM |
684 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
685 | { | |
59725dc2 | 686 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 687 | struct dccp_sock *dp = dccp_sk(sk); |
8c60f3fa | 688 | struct dccp_rx_hist_entry *packet; |
b6ee3d4a | 689 | struct timeval now; |
7c657876 ACM |
690 | |
691 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
692 | ||
b0e56780 | 693 | dccp_timestamp(sk, &now); |
b6ee3d4a | 694 | |
7c657876 ACM |
695 | switch (hcrx->ccid3hcrx_state) { |
696 | case TFRC_RSTATE_NO_DATA: | |
697 | hcrx->ccid3hcrx_x_recv = 0; | |
698 | break; | |
699 | case TFRC_RSTATE_DATA: { | |
b6ee3d4a ACM |
700 | const u32 delta = timeval_delta(&now, |
701 | &hcrx->ccid3hcrx_tstamp_last_feedback); | |
27ae543e ACM |
702 | hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, |
703 | delta); | |
7c657876 ACM |
704 | } |
705 | break; | |
59348b19 GR |
706 | case TFRC_RSTATE_TERM: |
707 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
708 | return; |
709 | } | |
710 | ||
8c60f3fa | 711 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
59d203f9 | 712 | if (unlikely(packet == NULL)) { |
59348b19 GR |
713 | DCCP_WARN("%s, sk=%p, no data packet in history!\n", |
714 | dccp_role(sk), sk); | |
7c657876 ACM |
715 | return; |
716 | } | |
717 | ||
b6ee3d4a | 718 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
66a377c5 | 719 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
7c657876 ACM |
720 | hcrx->ccid3hcrx_bytes_recv = 0; |
721 | ||
722 | /* Convert to multiples of 10us */ | |
b6ee3d4a ACM |
723 | hcrx->ccid3hcrx_elapsed_time = |
724 | timeval_delta(&now, &packet->dccphrx_tstamp) / 10; | |
7c657876 ACM |
725 | if (hcrx->ccid3hcrx_p == 0) |
726 | hcrx->ccid3hcrx_pinv = ~0; | |
727 | else | |
728 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; | |
507d37cf | 729 | dp->dccps_hc_rx_insert_options = 1; |
7c657876 ACM |
730 | dccp_send_ack(sk); |
731 | } | |
732 | ||
2d0817d1 | 733 | static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 734 | { |
59d203f9 | 735 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
60fe62e7 | 736 | __be32 x_recv, pinv; |
7c657876 | 737 | |
59d203f9 ACM |
738 | BUG_ON(hcrx == NULL); |
739 | ||
740 | if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) | |
2d0817d1 | 741 | return 0; |
7c657876 | 742 | |
66a377c5 | 743 | DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; |
4fded33b ACM |
744 | |
745 | if (dccp_packet_without_ack(skb)) | |
2d0817d1 ACM |
746 | return 0; |
747 | ||
4fded33b ACM |
748 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
749 | pinv = htonl(hcrx->ccid3hcrx_pinv); | |
2d0817d1 ACM |
750 | |
751 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && | |
752 | dccp_insert_option_elapsed_time(sk, skb, | |
753 | hcrx->ccid3hcrx_elapsed_time)) || | |
754 | dccp_insert_option_timestamp(sk, skb) || | |
755 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, | |
756 | &pinv, sizeof(pinv)) || | |
757 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, | |
758 | &x_recv, sizeof(x_recv))) | |
759 | return -1; | |
760 | ||
761 | return 0; | |
7c657876 ACM |
762 | } |
763 | ||
7c657876 ACM |
764 | /* calculate first loss interval |
765 | * | |
766 | * returns estimated loss interval in usecs */ | |
767 | ||
768 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) | |
769 | { | |
59725dc2 | 770 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
8c60f3fa | 771 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
7c657876 | 772 | u32 rtt, delta, x_recv, fval, p, tmp2; |
b6ee3d4a | 773 | struct timeval tstamp = { 0, }; |
7c657876 ACM |
774 | int interval = 0; |
775 | int win_count = 0; | |
776 | int step = 0; | |
777 | u64 tmp1; | |
778 | ||
8c60f3fa ACM |
779 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
780 | dccphrx_node) { | |
781 | if (dccp_rx_hist_entry_data_packet(entry)) { | |
7c657876 ACM |
782 | tail = entry; |
783 | ||
784 | switch (step) { | |
785 | case 0: | |
8c60f3fa | 786 | tstamp = entry->dccphrx_tstamp; |
c1734376 | 787 | win_count = entry->dccphrx_ccval; |
7c657876 ACM |
788 | step = 1; |
789 | break; | |
790 | case 1: | |
c1734376 | 791 | interval = win_count - entry->dccphrx_ccval; |
7c657876 ACM |
792 | if (interval < 0) |
793 | interval += TFRC_WIN_COUNT_LIMIT; | |
794 | if (interval > 4) | |
795 | goto found; | |
796 | break; | |
797 | } | |
798 | } | |
799 | } | |
800 | ||
59d203f9 | 801 | if (unlikely(step == 0)) { |
59348b19 GR |
802 | DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", |
803 | dccp_role(sk), sk); | |
7c657876 ACM |
804 | return ~0; |
805 | } | |
806 | ||
59d203f9 | 807 | if (unlikely(interval == 0)) { |
59348b19 GR |
808 | DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." |
809 | "Defaulting to 1\n", dccp_role(sk), sk); | |
7c657876 ACM |
810 | interval = 1; |
811 | } | |
812 | found: | |
66a377c5 | 813 | if (!tail) { |
59348b19 | 814 | DCCP_CRIT("tail is null\n"); |
66a377c5 IM |
815 | return ~0; |
816 | } | |
b6ee3d4a | 817 | rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; |
7c657876 ACM |
818 | ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", |
819 | dccp_role(sk), sk, rtt); | |
59348b19 GR |
820 | |
821 | if (rtt == 0) { | |
822 | DCCP_WARN("RTT==0, setting to 1\n"); | |
823 | rtt = 1; | |
824 | } | |
7c657876 | 825 | |
b0e56780 ACM |
826 | dccp_timestamp(sk, &tstamp); |
827 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); | |
828 | x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); | |
7c657876 | 829 | |
66a377c5 IM |
830 | if (x_recv == 0) |
831 | x_recv = hcrx->ccid3hcrx_x_recv; | |
832 | ||
7c657876 ACM |
833 | tmp1 = (u64)x_recv * (u64)rtt; |
834 | do_div(tmp1,10000000); | |
835 | tmp2 = (u32)tmp1; | |
66a377c5 IM |
836 | |
837 | if (!tmp2) { | |
59348b19 | 838 | DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv, rtt); |
66a377c5 IM |
839 | return ~0; |
840 | } | |
841 | ||
7c657876 ACM |
842 | fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; |
843 | /* do not alter order above or you will get overflow on 32 bit */ | |
36729c1a | 844 | p = tfrc_calc_x_reverse_lookup(fval); |
1f2333ae ACM |
845 | ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " |
846 | "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); | |
7c657876 ACM |
847 | |
848 | if (p == 0) | |
849 | return ~0; | |
850 | else | |
851 | return 1000000 / p; | |
852 | } | |
853 | ||
854 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) | |
855 | { | |
59725dc2 | 856 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
fc747e82 | 857 | struct dccp_li_hist_entry *head; |
66a377c5 | 858 | u64 seq_temp; |
7c657876 | 859 | |
66a377c5 IM |
860 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
861 | if (!dccp_li_hist_interval_new(ccid3_li_hist, | |
862 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) | |
863 | return; | |
7c657876 | 864 | |
fc747e82 IM |
865 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
866 | struct dccp_li_hist_entry, dccplih_node); | |
867 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); | |
66a377c5 IM |
868 | } else { |
869 | struct dccp_li_hist_entry *entry; | |
870 | struct list_head *tail; | |
871 | ||
fc747e82 IM |
872 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
873 | struct dccp_li_hist_entry, dccplih_node); | |
66a377c5 IM |
874 | /* FIXME win count check removed as was wrong */ |
875 | /* should make this check with receive history */ | |
876 | /* and compare there as per section 10.2 of RFC4342 */ | |
877 | ||
878 | /* new loss event detected */ | |
879 | /* calculate last interval length */ | |
880 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); | |
881 | entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); | |
882 | ||
883 | if (entry == NULL) { | |
59348b19 | 884 | DCCP_BUG("out of memory - can not allocate entry"); |
ae6706f0 | 885 | return; |
66a377c5 IM |
886 | } |
887 | ||
888 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); | |
889 | ||
890 | tail = hcrx->ccid3hcrx_li_hist.prev; | |
891 | list_del(tail); | |
892 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); | |
893 | ||
894 | /* Create the newest interval */ | |
895 | entry->dccplih_seqno = seq_loss; | |
896 | entry->dccplih_interval = seq_temp; | |
897 | entry->dccplih_win_count = win_loss; | |
898 | } | |
7c657876 ACM |
899 | } |
900 | ||
66a377c5 IM |
901 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
902 | struct dccp_rx_hist_entry *packet) | |
7c657876 | 903 | { |
59725dc2 | 904 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
66a377c5 IM |
905 | struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
906 | u64 seqno = packet->dccphrx_seqno; | |
907 | u64 tmp_seqno; | |
908 | int loss = 0; | |
909 | u8 ccval; | |
910 | ||
911 | ||
912 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
913 | ||
914 | if (!rx_hist || | |
915 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
916 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
917 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
918 | goto detect_out; | |
919 | } | |
920 | ||
7c657876 | 921 | |
66a377c5 IM |
922 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
923 | > TFRC_RECV_NUM_LATE_LOSS) { | |
924 | loss = 1; | |
925 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, | |
926 | hcrx->ccid3hcrx_ccval_nonloss); | |
927 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
928 | dccp_inc_seqno(&tmp_seqno); | |
929 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
930 | dccp_inc_seqno(&tmp_seqno); | |
931 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, | |
932 | tmp_seqno, &ccval)) { | |
933 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
934 | hcrx->ccid3hcrx_ccval_nonloss = ccval; | |
935 | dccp_inc_seqno(&tmp_seqno); | |
936 | } | |
937 | } | |
938 | ||
939 | /* FIXME - this code could be simplified with above while */ | |
940 | /* but works at moment */ | |
941 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
942 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
943 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
944 | } | |
945 | ||
946 | detect_out: | |
947 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, | |
948 | &hcrx->ccid3hcrx_li_hist, packet, | |
949 | hcrx->ccid3hcrx_seqno_nonloss); | |
950 | return loss; | |
7c657876 ACM |
951 | } |
952 | ||
7c657876 ACM |
953 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
954 | { | |
59725dc2 | 955 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
4fded33b | 956 | const struct dccp_options_received *opt_recv; |
8c60f3fa | 957 | struct dccp_rx_hist_entry *packet; |
7c657876 | 958 | struct timeval now; |
66a377c5 | 959 | u32 p_prev, rtt_prev, r_sample, t_elapsed; |
78ad713d | 960 | int loss, payload_size; |
1f2333ae | 961 | |
59348b19 | 962 | BUG_ON(hcrx == NULL); |
7c657876 | 963 | |
59725dc2 | 964 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
4fded33b | 965 | |
7c657876 ACM |
966 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
967 | case DCCP_PKT_ACK: | |
968 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
969 | return; | |
970 | case DCCP_PKT_DATAACK: | |
4fded33b | 971 | if (opt_recv->dccpor_timestamp_echo == 0) |
7c657876 | 972 | break; |
66a377c5 | 973 | rtt_prev = hcrx->ccid3hcrx_rtt; |
b0e56780 | 974 | dccp_timestamp(sk, &now); |
b3a3077d ACM |
975 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
976 | r_sample = timeval_usecs(&now); | |
977 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; | |
978 | ||
979 | if (unlikely(r_sample <= t_elapsed)) | |
59348b19 GR |
980 | DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", |
981 | r_sample, t_elapsed); | |
b3a3077d ACM |
982 | else |
983 | r_sample -= t_elapsed; | |
984 | ||
985 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
986 | hcrx->ccid3hcrx_rtt = r_sample; | |
987 | else | |
988 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + | |
989 | r_sample / 10; | |
990 | ||
66a377c5 IM |
991 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
992 | ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", | |
4fded33b ACM |
993 | dccp_role(sk), hcrx->ccid3hcrx_rtt, |
994 | opt_recv->dccpor_elapsed_time); | |
7c657876 ACM |
995 | break; |
996 | case DCCP_PKT_DATA: | |
997 | break; | |
59d203f9 | 998 | default: /* We're not interested in other packet types, move along */ |
7c657876 ACM |
999 | return; |
1000 | } | |
1001 | ||
b0e56780 | 1002 | packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, |
8c60f3fa | 1003 | skb, SLAB_ATOMIC); |
59d203f9 | 1004 | if (unlikely(packet == NULL)) { |
59348b19 GR |
1005 | DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " |
1006 | "to history, consider it lost!\n", dccp_role(sk), sk); | |
7c657876 ACM |
1007 | return; |
1008 | } | |
1009 | ||
66a377c5 | 1010 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
7c657876 ACM |
1011 | |
1012 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) | |
1013 | return; | |
1014 | ||
78ad713d GR |
1015 | payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; |
1016 | ccid3_hc_rx_update_s(hcrx, payload_size); | |
1017 | ||
7c657876 ACM |
1018 | switch (hcrx->ccid3hcrx_state) { |
1019 | case TFRC_RSTATE_NO_DATA: | |
1f2333ae ACM |
1020 | ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " |
1021 | "feedback\n", | |
1022 | dccp_role(sk), sk, | |
1023 | dccp_state_name(sk->sk_state), skb); | |
7c657876 ACM |
1024 | ccid3_hc_rx_send_feedback(sk); |
1025 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); | |
1026 | return; | |
1027 | case TFRC_RSTATE_DATA: | |
78ad713d | 1028 | hcrx->ccid3hcrx_bytes_recv += payload_size; |
66a377c5 | 1029 | if (loss) |
b6ee3d4a ACM |
1030 | break; |
1031 | ||
b0e56780 | 1032 | dccp_timestamp(sk, &now); |
b6ee3d4a ACM |
1033 | if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= |
1034 | hcrx->ccid3hcrx_rtt) { | |
1035 | hcrx->ccid3hcrx_tstamp_last_ack = now; | |
1036 | ccid3_hc_rx_send_feedback(sk); | |
7c657876 | 1037 | } |
b6ee3d4a | 1038 | return; |
59348b19 GR |
1039 | case TFRC_RSTATE_TERM: |
1040 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
1041 | return; |
1042 | } | |
1043 | ||
1044 | /* Dealing with packet loss */ | |
4fded33b ACM |
1045 | ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", |
1046 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); | |
7c657876 | 1047 | |
7c657876 ACM |
1048 | p_prev = hcrx->ccid3hcrx_p; |
1049 | ||
1050 | /* Calculate loss event rate */ | |
c0996660 IM |
1051 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
1052 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); | |
1053 | ||
7c657876 | 1054 | /* Scaling up by 1000000 as fixed decimal */ |
c0996660 IM |
1055 | if (i_mean != 0) |
1056 | hcrx->ccid3hcrx_p = 1000000 / i_mean; | |
59348b19 GR |
1057 | } else |
1058 | DCCP_BUG("empty loss history"); | |
7c657876 ACM |
1059 | |
1060 | if (hcrx->ccid3hcrx_p > p_prev) { | |
1061 | ccid3_hc_rx_send_feedback(sk); | |
1062 | return; | |
1063 | } | |
1064 | } | |
1065 | ||
91f0ebf7 | 1066 | static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) |
7c657876 | 1067 | { |
91f0ebf7 | 1068 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
7c657876 ACM |
1069 | |
1070 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
1071 | ||
7c657876 ACM |
1072 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; |
1073 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); | |
ae6706f0 | 1074 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
b0e56780 | 1075 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
954ee31f | 1076 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
78ad713d | 1077 | hcrx->ccid3hcrx_s = 0; |
954ee31f | 1078 | hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ |
7c657876 ACM |
1079 | return 0; |
1080 | } | |
1081 | ||
1082 | static void ccid3_hc_rx_exit(struct sock *sk) | |
1083 | { | |
59725dc2 | 1084 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 1085 | |
59d203f9 | 1086 | BUG_ON(hcrx == NULL); |
7c657876 ACM |
1087 | |
1088 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); | |
1089 | ||
1090 | /* Empty packet history */ | |
8c60f3fa | 1091 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
7c657876 ACM |
1092 | |
1093 | /* Empty loss interval history */ | |
ae6706f0 | 1094 | dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); |
7c657876 ACM |
1095 | } |
1096 | ||
2babe1f6 ACM |
1097 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
1098 | { | |
59725dc2 | 1099 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
2babe1f6 | 1100 | |
59c2353d ACM |
1101 | /* Listen socks doesn't have a private CCID block */ |
1102 | if (sk->sk_state == DCCP_LISTEN) | |
1103 | return; | |
1104 | ||
59d203f9 | 1105 | BUG_ON(hcrx == NULL); |
2babe1f6 ACM |
1106 | |
1107 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; | |
1108 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; | |
1109 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; | |
1110 | } | |
1111 | ||
1112 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) | |
1113 | { | |
59725dc2 | 1114 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
2babe1f6 | 1115 | |
59c2353d ACM |
1116 | /* Listen socks doesn't have a private CCID block */ |
1117 | if (sk->sk_state == DCCP_LISTEN) | |
1118 | return; | |
1119 | ||
59d203f9 | 1120 | BUG_ON(hctx == NULL); |
2babe1f6 ACM |
1121 | |
1122 | info->tcpi_rto = hctx->ccid3hctx_t_rto; | |
1123 | info->tcpi_rtt = hctx->ccid3hctx_rtt; | |
1124 | } | |
1125 | ||
88f964db ACM |
1126 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
1127 | u32 __user *optval, int __user *optlen) | |
1128 | { | |
1129 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); | |
1130 | const void *val; | |
1131 | ||
1132 | /* Listen socks doesn't have a private CCID block */ | |
1133 | if (sk->sk_state == DCCP_LISTEN) | |
1134 | return -EINVAL; | |
1135 | ||
1136 | switch (optname) { | |
1137 | case DCCP_SOCKOPT_CCID_RX_INFO: | |
1138 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) | |
1139 | return -EINVAL; | |
1140 | len = sizeof(hcrx->ccid3hcrx_tfrc); | |
1141 | val = &hcrx->ccid3hcrx_tfrc; | |
1142 | break; | |
1143 | default: | |
1144 | return -ENOPROTOOPT; | |
1145 | } | |
1146 | ||
1147 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1148 | return -EFAULT; | |
1149 | ||
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, | |
1154 | u32 __user *optval, int __user *optlen) | |
1155 | { | |
1156 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
1157 | const void *val; | |
1158 | ||
1159 | /* Listen socks doesn't have a private CCID block */ | |
1160 | if (sk->sk_state == DCCP_LISTEN) | |
1161 | return -EINVAL; | |
1162 | ||
1163 | switch (optname) { | |
1164 | case DCCP_SOCKOPT_CCID_TX_INFO: | |
1165 | if (len < sizeof(hctx->ccid3hctx_tfrc)) | |
1166 | return -EINVAL; | |
1167 | len = sizeof(hctx->ccid3hctx_tfrc); | |
1168 | val = &hctx->ccid3hctx_tfrc; | |
1169 | break; | |
1170 | default: | |
1171 | return -ENOPROTOOPT; | |
1172 | } | |
1173 | ||
1174 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1175 | return -EFAULT; | |
1176 | ||
1177 | return 0; | |
1178 | } | |
1179 | ||
91f0ebf7 | 1180 | static struct ccid_operations ccid3 = { |
3dd9a7c3 | 1181 | .ccid_id = DCCPC_CCID3, |
7c657876 ACM |
1182 | .ccid_name = "ccid3", |
1183 | .ccid_owner = THIS_MODULE, | |
91f0ebf7 | 1184 | .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), |
7c657876 ACM |
1185 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
1186 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, | |
1187 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, | |
1188 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, | |
1189 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, | |
1190 | .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, | |
1191 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, | |
91f0ebf7 | 1192 | .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), |
7c657876 ACM |
1193 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
1194 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, | |
1195 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, | |
1196 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, | |
2babe1f6 ACM |
1197 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
1198 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, | |
88f964db ACM |
1199 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
1200 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, | |
7c657876 ACM |
1201 | }; |
1202 | ||
56724aa4 | 1203 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
1204 | module_param(ccid3_debug, int, 0444); |
1205 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); | |
56724aa4 | 1206 | #endif |
7c657876 ACM |
1207 | |
1208 | static __init int ccid3_module_init(void) | |
1209 | { | |
8c60f3fa | 1210 | int rc = -ENOBUFS; |
7c657876 | 1211 | |
8c60f3fa ACM |
1212 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
1213 | if (ccid3_rx_hist == NULL) | |
7c657876 ACM |
1214 | goto out; |
1215 | ||
8c60f3fa ACM |
1216 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
1217 | if (ccid3_tx_hist == NULL) | |
1218 | goto out_free_rx; | |
7c657876 | 1219 | |
ae6706f0 ACM |
1220 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
1221 | if (ccid3_li_hist == NULL) | |
8c60f3fa | 1222 | goto out_free_tx; |
7c657876 ACM |
1223 | |
1224 | rc = ccid_register(&ccid3); | |
1225 | if (rc != 0) | |
1226 | goto out_free_loss_interval_history; | |
7c657876 ACM |
1227 | out: |
1228 | return rc; | |
8c60f3fa | 1229 | |
7c657876 | 1230 | out_free_loss_interval_history: |
ae6706f0 ACM |
1231 | dccp_li_hist_delete(ccid3_li_hist); |
1232 | ccid3_li_hist = NULL; | |
8c60f3fa ACM |
1233 | out_free_tx: |
1234 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1235 | ccid3_tx_hist = NULL; | |
1236 | out_free_rx: | |
1237 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1238 | ccid3_rx_hist = NULL; | |
7c657876 ACM |
1239 | goto out; |
1240 | } | |
1241 | module_init(ccid3_module_init); | |
1242 | ||
1243 | static __exit void ccid3_module_exit(void) | |
1244 | { | |
1245 | ccid_unregister(&ccid3); | |
1246 | ||
8c60f3fa ACM |
1247 | if (ccid3_tx_hist != NULL) { |
1248 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1249 | ccid3_tx_hist = NULL; | |
7c657876 | 1250 | } |
8c60f3fa ACM |
1251 | if (ccid3_rx_hist != NULL) { |
1252 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1253 | ccid3_rx_hist = NULL; | |
7c657876 | 1254 | } |
ae6706f0 ACM |
1255 | if (ccid3_li_hist != NULL) { |
1256 | dccp_li_hist_delete(ccid3_li_hist); | |
1257 | ccid3_li_hist = NULL; | |
7c657876 ACM |
1258 | } |
1259 | } | |
1260 | module_exit(ccid3_module_exit); | |
1261 | ||
e6bccd35 | 1262 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
1f2333ae | 1263 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
7c657876 ACM |
1264 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
1265 | MODULE_LICENSE("GPL"); | |
1266 | MODULE_ALIAS("net-dccp-ccid-3"); |