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 | */ | |
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 | ||
162 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) | |
163 | { | |
164 | struct sock *sk = (struct sock *)data; | |
59725dc2 | 165 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
48e03eee | 166 | unsigned long next_tmout = USEC_PER_SEC / 5; |
7c657876 ACM |
167 | |
168 | bh_lock_sock(sk); | |
169 | if (sock_owned_by_user(sk)) { | |
170 | /* Try again later. */ | |
171 | /* XXX: set some sensible MIB */ | |
48e03eee | 172 | goto restart_timer; |
7c657876 ACM |
173 | } |
174 | ||
175 | ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, | |
176 | ccid3_tx_state_name(hctx->ccid3hctx_state)); | |
177 | ||
7c657876 | 178 | switch (hctx->ccid3hctx_state) { |
7c657876 ACM |
179 | case TFRC_SSTATE_NO_FBACK: |
180 | /* Halve send rate */ | |
181 | hctx->ccid3hctx_x /= 2; | |
6b5e633a ACM |
182 | if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / |
183 | TFRC_MAX_BACK_OFF_TIME)) | |
1f2333ae ACM |
184 | hctx->ccid3hctx_x = (hctx->ccid3hctx_s / |
185 | TFRC_MAX_BACK_OFF_TIME); | |
7c657876 | 186 | |
1f2333ae ACM |
187 | ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " |
188 | "bytes/s\n", | |
189 | dccp_role(sk), sk, | |
190 | ccid3_tx_state_name(hctx->ccid3hctx_state), | |
7c657876 | 191 | hctx->ccid3hctx_x); |
48e03eee GR |
192 | /* The value of R is still undefined and so we can not recompute |
193 | * the timout value. Keep initial value as per [RFC 4342, 5]. */ | |
194 | next_tmout = TFRC_INITIAL_TIMEOUT; | |
17893bc1 | 195 | ccid3_update_send_time(hctx); |
7c657876 ACM |
196 | break; |
197 | case TFRC_SSTATE_FBACK: | |
1f2333ae ACM |
198 | /* |
199 | * Check if IDLE since last timeout and recv rate is less than | |
200 | * 4 packets per RTT | |
201 | */ | |
1f2333ae | 202 | if (!hctx->ccid3hctx_idle || |
6b5e633a ACM |
203 | (hctx->ccid3hctx_x_recv >= |
204 | 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { | |
1f2333ae ACM |
205 | ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", |
206 | dccp_role(sk), sk, | |
7c657876 ACM |
207 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
208 | /* Halve sending rate */ | |
209 | ||
210 | /* If (X_calc > 2 * X_recv) | |
211 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); | |
212 | * Else | |
213 | * X_recv = X_calc / 4; | |
214 | */ | |
1f2333ae ACM |
215 | BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && |
216 | hctx->ccid3hctx_x_calc == 0); | |
7c657876 ACM |
217 | |
218 | /* check also if p is zero -> x_calc is infinity? */ | |
219 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P || | |
220 | hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) | |
221 | hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, | |
222 | hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME)); | |
223 | else | |
224 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; | |
225 | ||
226 | /* Update sending rate */ | |
227 | ccid3_hc_tx_update_x(sk); | |
228 | } | |
6b5e633a ACM |
229 | /* |
230 | * Schedule no feedback timer to expire in | |
5d0dbc4a GR |
231 | * max(4 * t_RTO, 2 * s/X) = max(4 * t_RTO, 2 * t_ipi) |
232 | * XXX This is non-standard, RFC 3448, 4.3 uses 4 * R | |
6b5e633a | 233 | */ |
5d0dbc4a | 234 | next_tmout = max(hctx->ccid3hctx_t_rto, 2*hctx->ccid3hctx_t_ipi); |
7c657876 | 235 | break; |
59348b19 GR |
236 | case TFRC_SSTATE_NO_SENT: |
237 | DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); | |
238 | /* fall through */ | |
239 | case TFRC_SSTATE_TERM: | |
7c657876 ACM |
240 | goto out; |
241 | } | |
242 | ||
7c657876 | 243 | hctx->ccid3hctx_idle = 1; |
48e03eee GR |
244 | |
245 | restart_timer: | |
246 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
247 | jiffies + usecs_to_jiffies(next_tmout)); | |
7c657876 ACM |
248 | out: |
249 | bh_unlock_sock(sk); | |
250 | sock_put(sk); | |
251 | } | |
252 | ||
7da7f456 GR |
253 | /* |
254 | * returns | |
255 | * > 0: delay (in msecs) that should pass before actually sending | |
256 | * = 0: can send immediately | |
257 | * < 0: error condition; do not send packet | |
258 | */ | |
27258ee5 ACM |
259 | static int ccid3_hc_tx_send_packet(struct sock *sk, |
260 | struct sk_buff *skb, int len) | |
7c657876 ACM |
261 | { |
262 | struct dccp_sock *dp = dccp_sk(sk); | |
59725dc2 | 263 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
8c60f3fa | 264 | struct dccp_tx_hist_entry *new_packet; |
7c657876 | 265 | struct timeval now; |
27258ee5 | 266 | long delay; |
7c657876 | 267 | |
59348b19 | 268 | BUG_ON(hctx == NULL); |
1f2333ae | 269 | |
7c657876 | 270 | /* |
da335baf GR |
271 | * This function is called only for Data and DataAck packets. Sending |
272 | * zero-sized Data(Ack)s is theoretically possible, but for congestion | |
273 | * control this case is pathological - ignore it. | |
7c657876 | 274 | */ |
59d203f9 | 275 | if (unlikely(len == 0)) |
da335baf | 276 | return -EBADMSG; |
7c657876 ACM |
277 | |
278 | /* See if last packet allocated was not sent */ | |
8c60f3fa ACM |
279 | new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
280 | if (new_packet == NULL || new_packet->dccphtx_sent) { | |
1f2333ae ACM |
281 | new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, |
282 | SLAB_ATOMIC); | |
7c657876 | 283 | |
59d203f9 | 284 | if (unlikely(new_packet == NULL)) { |
59348b19 GR |
285 | DCCP_WARN("%s, sk=%p, not enough mem to add to history," |
286 | "send refused\n", dccp_role(sk), sk); | |
7da7f456 | 287 | return -ENOBUFS; |
7c657876 ACM |
288 | } |
289 | ||
8c60f3fa | 290 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); |
7c657876 ACM |
291 | } |
292 | ||
b0e56780 | 293 | dccp_timestamp(sk, &now); |
7c657876 ACM |
294 | |
295 | switch (hctx->ccid3hctx_state) { | |
296 | case TFRC_SSTATE_NO_SENT: | |
1f2333ae ACM |
297 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
298 | jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); | |
7c657876 ACM |
299 | hctx->ccid3hctx_last_win_count = 0; |
300 | hctx->ccid3hctx_t_last_win_count = now; | |
301 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); | |
7c657876 | 302 | |
90feeb95 GR |
303 | /* First timeout, according to [RFC 3448, 4.2], is 1 second */ |
304 | hctx->ccid3hctx_t_ipi = USEC_PER_SEC; | |
305 | /* Initial delta: minimum of 0.5 sec and t_gran/2 */ | |
306 | hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; | |
307 | ||
308 | /* Set t_0 for initial packet */ | |
7c657876 | 309 | hctx->ccid3hctx_t_nom = now; |
7c657876 ACM |
310 | break; |
311 | case TFRC_SSTATE_NO_FBACK: | |
312 | case TFRC_SSTATE_FBACK: | |
91cf5a17 GR |
313 | delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); |
314 | /* | |
315 | * Scheduling of packet transmissions [RFC 3448, 4.6] | |
316 | * | |
317 | * if (t_now > t_nom - delta) | |
318 | * // send the packet now | |
319 | * else | |
320 | * // send the packet in (t_nom - t_now) milliseconds. | |
321 | */ | |
7da7f456 GR |
322 | if (delay >= hctx->ccid3hctx_delta) |
323 | return delay / 1000L; | |
7c657876 | 324 | break; |
59348b19 GR |
325 | case TFRC_SSTATE_TERM: |
326 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7da7f456 | 327 | return -EINVAL; |
7c657876 ACM |
328 | } |
329 | ||
7da7f456 GR |
330 | /* prepare to send now (add options etc.) */ |
331 | dp->dccps_hc_tx_insert_options = 1; | |
332 | new_packet->dccphtx_ccval = DCCP_SKB_CB(skb)->dccpd_ccval = | |
333 | hctx->ccid3hctx_last_win_count; | |
334 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); | |
335 | ||
336 | return 0; | |
7c657876 ACM |
337 | } |
338 | ||
339 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len) | |
340 | { | |
59725dc2 ACM |
341 | const struct dccp_sock *dp = dccp_sk(sk); |
342 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 ACM |
343 | struct timeval now; |
344 | ||
59348b19 | 345 | BUG_ON(hctx == NULL); |
7c657876 | 346 | |
b0e56780 | 347 | dccp_timestamp(sk, &now); |
7c657876 ACM |
348 | |
349 | /* check if we have sent a data packet */ | |
350 | if (len > 0) { | |
351 | unsigned long quarter_rtt; | |
8c60f3fa | 352 | struct dccp_tx_hist_entry *packet; |
7c657876 | 353 | |
8c60f3fa | 354 | packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
59d203f9 | 355 | if (unlikely(packet == NULL)) { |
59348b19 | 356 | DCCP_WARN("packet doesn't exist in history!\n"); |
7c657876 ACM |
357 | return; |
358 | } | |
59d203f9 | 359 | if (unlikely(packet->dccphtx_sent)) { |
59348b19 | 360 | DCCP_WARN("no unsent packet in history!\n"); |
7c657876 ACM |
361 | return; |
362 | } | |
8c60f3fa ACM |
363 | packet->dccphtx_tstamp = now; |
364 | packet->dccphtx_seqno = dp->dccps_gss; | |
7c657876 | 365 | /* |
1f2333ae | 366 | * Check if win_count have changed |
0e64e94e | 367 | * Algorithm in "8.1. Window Counter Value" in RFC 4342. |
7c657876 | 368 | */ |
6b5e633a ACM |
369 | quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); |
370 | if (likely(hctx->ccid3hctx_rtt > 8)) | |
371 | quarter_rtt /= hctx->ccid3hctx_rtt / 4; | |
372 | ||
7c657876 ACM |
373 | if (quarter_rtt > 0) { |
374 | hctx->ccid3hctx_t_last_win_count = now; | |
375 | hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + | |
376 | min_t(unsigned long, quarter_rtt, 5)) % 16; | |
1f2333ae ACM |
377 | ccid3_pr_debug("%s, sk=%p, window changed from " |
378 | "%u to %u!\n", | |
7c657876 | 379 | dccp_role(sk), sk, |
c1734376 | 380 | packet->dccphtx_ccval, |
7c657876 ACM |
381 | hctx->ccid3hctx_last_win_count); |
382 | } | |
1f2333ae | 383 | |
7c657876 | 384 | hctx->ccid3hctx_idle = 0; |
c1734376 | 385 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; |
8c60f3fa | 386 | packet->dccphtx_sent = 1; |
7c657876 ACM |
387 | } else |
388 | ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", | |
389 | dccp_role(sk), sk, dp->dccps_gss); | |
7c657876 ACM |
390 | } |
391 | ||
392 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) | |
393 | { | |
59725dc2 ACM |
394 | const struct dccp_sock *dp = dccp_sk(sk); |
395 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 | 396 | struct ccid3_options_received *opt_recv; |
8c60f3fa | 397 | struct dccp_tx_hist_entry *packet; |
b0e56780 | 398 | struct timeval now; |
7c657876 | 399 | unsigned long next_tmout; |
1bc09869 | 400 | u32 t_elapsed; |
7c657876 ACM |
401 | u32 pinv; |
402 | u32 x_recv; | |
403 | u32 r_sample; | |
1f2333ae | 404 | |
59348b19 | 405 | BUG_ON(hctx == NULL); |
7c657876 ACM |
406 | |
407 | /* we are only interested in ACKs */ | |
408 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || | |
409 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) | |
410 | return; | |
411 | ||
412 | opt_recv = &hctx->ccid3hctx_options_received; | |
413 | ||
1a28599a | 414 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; |
7c657876 ACM |
415 | x_recv = opt_recv->ccid3or_receive_rate; |
416 | pinv = opt_recv->ccid3or_loss_event_rate; | |
417 | ||
418 | switch (hctx->ccid3hctx_state) { | |
7c657876 ACM |
419 | case TFRC_SSTATE_NO_FBACK: |
420 | case TFRC_SSTATE_FBACK: | |
421 | /* Calculate new round trip sample by | |
422 | * R_sample = (now - t_recvdata) - t_delay */ | |
423 | /* get t_recvdata from history */ | |
8c60f3fa ACM |
424 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
425 | DCCP_SKB_CB(skb)->dccpd_ack_seq); | |
59d203f9 | 426 | if (unlikely(packet == NULL)) { |
59348b19 GR |
427 | DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist " |
428 | "in history!\n", dccp_role(sk), sk, | |
59d203f9 | 429 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
59348b19 | 430 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
7c657876 ACM |
431 | return; |
432 | } | |
433 | ||
434 | /* Update RTT */ | |
b0e56780 ACM |
435 | dccp_timestamp(sk, &now); |
436 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); | |
1a28599a | 437 | if (unlikely(r_sample <= t_elapsed)) |
59348b19 GR |
438 | DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n", |
439 | r_sample, t_elapsed); | |
1a28599a ACM |
440 | else |
441 | r_sample -= t_elapsed; | |
7c657876 ACM |
442 | |
443 | /* Update RTT estimate by | |
444 | * If (No feedback recv) | |
445 | * R = R_sample; | |
446 | * Else | |
447 | * R = q * R + (1 - q) * R_sample; | |
448 | * | |
449 | * q is a constant, RFC 3448 recomments 0.9 | |
450 | */ | |
451 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { | |
452 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); | |
453 | hctx->ccid3hctx_rtt = r_sample; | |
454 | } else | |
1f2333ae ACM |
455 | hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + |
456 | r_sample / 10; | |
7c657876 | 457 | |
1f2333ae ACM |
458 | ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " |
459 | "r_sample=%us\n", dccp_role(sk), sk, | |
460 | hctx->ccid3hctx_rtt, r_sample); | |
7c657876 | 461 | |
7c657876 | 462 | /* Update receive rate */ |
1f2333ae | 463 | hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ |
7c657876 ACM |
464 | |
465 | /* Update loss event rate */ | |
466 | if (pinv == ~0 || pinv == 0) | |
467 | hctx->ccid3hctx_p = 0; | |
468 | else { | |
469 | hctx->ccid3hctx_p = 1000000 / pinv; | |
470 | ||
471 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { | |
472 | hctx->ccid3hctx_p = TFRC_SMALLEST_P; | |
1f2333ae ACM |
473 | ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", |
474 | dccp_role(sk), sk); | |
7c657876 ACM |
475 | } |
476 | } | |
477 | ||
478 | /* unschedule no feedback timer */ | |
479 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
480 | ||
17893bc1 | 481 | /* Update sending rate (and likely t_ipi, t_nom, and delta) */ |
7c657876 ACM |
482 | ccid3_hc_tx_update_x(sk); |
483 | ||
7c657876 | 484 | /* remove all packets older than the one acked from history */ |
8c60f3fa ACM |
485 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
486 | &hctx->ccid3hctx_hist, packet); | |
c530cfb1 ACM |
487 | /* |
488 | * As we have calculated new ipi, delta, t_nom it is possible that | |
5d0dbc4a | 489 | * we now can send a packet, so wake up dccp_wait_for_ccid |
c530cfb1 ACM |
490 | */ |
491 | sk->sk_write_space(sk); | |
8c60f3fa | 492 | |
5d0dbc4a GR |
493 | |
494 | /* Update timeout interval. We use the alternative variant of | |
495 | * [RFC 3448, 3.1] which sets the upper bound of t_rto to one | |
496 | * second, as it is suggested for TCP (see RFC 2988, 2.4). */ | |
497 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, | |
498 | USEC_PER_SEC ); | |
1f2333ae ACM |
499 | /* |
500 | * Schedule no feedback timer to expire in | |
5d0dbc4a GR |
501 | * max(4 * t_RTO, 2 * s/X) = max(4 * t_RTO, 2 * t_ipi) |
502 | * XXX This is non-standard, RFC 3448, 4.3 uses 4 * R | |
1f2333ae | 503 | */ |
5d0dbc4a | 504 | next_tmout = max(hctx->ccid3hctx_t_rto, 2*hctx->ccid3hctx_t_ipi); |
6b5e633a | 505 | |
1f2333ae ACM |
506 | ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " |
507 | "expire in %lu jiffies (%luus)\n", | |
508 | dccp_role(sk), sk, | |
509 | usecs_to_jiffies(next_tmout), next_tmout); | |
7c657876 ACM |
510 | |
511 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
5d0dbc4a | 512 | jiffies + usecs_to_jiffies(next_tmout)); |
7c657876 ACM |
513 | |
514 | /* set idle flag */ | |
515 | hctx->ccid3hctx_idle = 1; | |
516 | break; | |
5e19e3fc GR |
517 | case TFRC_SSTATE_NO_SENT: |
518 | DCCP_WARN("Illegal ACK received - no packet has been sent\n"); | |
519 | /* fall through */ | |
520 | case TFRC_SSTATE_TERM: /* ignore feedback when closing */ | |
7c657876 ACM |
521 | break; |
522 | } | |
523 | } | |
524 | ||
2d0817d1 | 525 | static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 526 | { |
59d203f9 | 527 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 528 | |
59d203f9 ACM |
529 | BUG_ON(hctx == NULL); |
530 | ||
2d0817d1 ACM |
531 | if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) |
532 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; | |
533 | return 0; | |
7c657876 ACM |
534 | } |
535 | ||
536 | static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, | |
1f2333ae ACM |
537 | unsigned char len, u16 idx, |
538 | unsigned char *value) | |
7c657876 ACM |
539 | { |
540 | int rc = 0; | |
59725dc2 ACM |
541 | const struct dccp_sock *dp = dccp_sk(sk); |
542 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 ACM |
543 | struct ccid3_options_received *opt_recv; |
544 | ||
59d203f9 | 545 | BUG_ON(hctx == NULL); |
7c657876 ACM |
546 | |
547 | opt_recv = &hctx->ccid3hctx_options_received; | |
548 | ||
549 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { | |
550 | opt_recv->ccid3or_seqno = dp->dccps_gsr; | |
551 | opt_recv->ccid3or_loss_event_rate = ~0; | |
552 | opt_recv->ccid3or_loss_intervals_idx = 0; | |
553 | opt_recv->ccid3or_loss_intervals_len = 0; | |
554 | opt_recv->ccid3or_receive_rate = 0; | |
555 | } | |
556 | ||
557 | switch (option) { | |
558 | case TFRC_OPT_LOSS_EVENT_RATE: | |
59d203f9 | 559 | if (unlikely(len != 4)) { |
59348b19 GR |
560 | DCCP_WARN("%s, sk=%p, invalid len %d " |
561 | "for TFRC_OPT_LOSS_EVENT_RATE\n", | |
562 | dccp_role(sk), sk, len); | |
7c657876 ACM |
563 | rc = -EINVAL; |
564 | } else { | |
60fe62e7 | 565 | opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
566 | ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", |
567 | dccp_role(sk), sk, | |
568 | opt_recv->ccid3or_loss_event_rate); | |
569 | } | |
570 | break; | |
571 | case TFRC_OPT_LOSS_INTERVALS: | |
572 | opt_recv->ccid3or_loss_intervals_idx = idx; | |
573 | opt_recv->ccid3or_loss_intervals_len = len; | |
574 | ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", | |
575 | dccp_role(sk), sk, | |
576 | opt_recv->ccid3or_loss_intervals_idx, | |
577 | opt_recv->ccid3or_loss_intervals_len); | |
578 | break; | |
579 | case TFRC_OPT_RECEIVE_RATE: | |
59d203f9 | 580 | if (unlikely(len != 4)) { |
59348b19 GR |
581 | DCCP_WARN("%s, sk=%p, invalid len %d " |
582 | "for TFRC_OPT_RECEIVE_RATE\n", | |
583 | dccp_role(sk), sk, len); | |
7c657876 ACM |
584 | rc = -EINVAL; |
585 | } else { | |
60fe62e7 | 586 | opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
587 | ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", |
588 | dccp_role(sk), sk, | |
589 | opt_recv->ccid3or_receive_rate); | |
590 | } | |
591 | break; | |
592 | } | |
593 | ||
594 | return rc; | |
595 | } | |
596 | ||
91f0ebf7 | 597 | static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) |
7c657876 ACM |
598 | { |
599 | struct dccp_sock *dp = dccp_sk(sk); | |
91f0ebf7 | 600 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
7c657876 | 601 | |
a84ffe43 ACM |
602 | if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && |
603 | dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) | |
604 | hctx->ccid3hctx_s = dp->dccps_packet_size; | |
7c657876 ACM |
605 | else |
606 | hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE; | |
607 | ||
1f2333ae ACM |
608 | /* Set transmission rate to 1 packet per second */ |
609 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; | |
7c657876 ACM |
610 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
611 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); | |
aa5d7df3 ACM |
612 | |
613 | hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; | |
614 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; | |
7c657876 ACM |
615 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
616 | ||
617 | return 0; | |
618 | } | |
619 | ||
620 | static void ccid3_hc_tx_exit(struct sock *sk) | |
621 | { | |
59725dc2 | 622 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 623 | |
7c657876 ACM |
624 | BUG_ON(hctx == NULL); |
625 | ||
626 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); | |
627 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
628 | ||
629 | /* Empty packet history */ | |
8c60f3fa | 630 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
7c657876 ACM |
631 | } |
632 | ||
633 | /* | |
634 | * RX Half Connection methods | |
635 | */ | |
636 | ||
56724aa4 | 637 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
638 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
639 | { | |
640 | static char *ccid3_rx_state_names[] = { | |
641 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", | |
642 | [TFRC_RSTATE_DATA] = "DATA", | |
643 | [TFRC_RSTATE_TERM] = "TERM", | |
644 | }; | |
645 | ||
646 | return ccid3_rx_state_names[state]; | |
647 | } | |
648 | #endif | |
649 | ||
c25a18ba ACM |
650 | static void ccid3_hc_rx_set_state(struct sock *sk, |
651 | enum ccid3_hc_rx_states state) | |
7c657876 | 652 | { |
59725dc2 | 653 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 ACM |
654 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
655 | ||
656 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
657 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
658 | ccid3_rx_state_name(state)); | |
7c657876 ACM |
659 | WARN_ON(state == oldstate); |
660 | hcrx->ccid3hcrx_state = state; | |
661 | } | |
662 | ||
7c657876 ACM |
663 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
664 | { | |
59725dc2 | 665 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 666 | struct dccp_sock *dp = dccp_sk(sk); |
8c60f3fa | 667 | struct dccp_rx_hist_entry *packet; |
b6ee3d4a | 668 | struct timeval now; |
7c657876 ACM |
669 | |
670 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
671 | ||
b0e56780 | 672 | dccp_timestamp(sk, &now); |
b6ee3d4a | 673 | |
7c657876 ACM |
674 | switch (hcrx->ccid3hcrx_state) { |
675 | case TFRC_RSTATE_NO_DATA: | |
676 | hcrx->ccid3hcrx_x_recv = 0; | |
677 | break; | |
678 | case TFRC_RSTATE_DATA: { | |
b6ee3d4a ACM |
679 | const u32 delta = timeval_delta(&now, |
680 | &hcrx->ccid3hcrx_tstamp_last_feedback); | |
27ae543e ACM |
681 | hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, |
682 | delta); | |
7c657876 ACM |
683 | } |
684 | break; | |
59348b19 GR |
685 | case TFRC_RSTATE_TERM: |
686 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
687 | return; |
688 | } | |
689 | ||
8c60f3fa | 690 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
59d203f9 | 691 | if (unlikely(packet == NULL)) { |
59348b19 GR |
692 | DCCP_WARN("%s, sk=%p, no data packet in history!\n", |
693 | dccp_role(sk), sk); | |
7c657876 ACM |
694 | return; |
695 | } | |
696 | ||
b6ee3d4a | 697 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
66a377c5 | 698 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
7c657876 ACM |
699 | hcrx->ccid3hcrx_bytes_recv = 0; |
700 | ||
701 | /* Convert to multiples of 10us */ | |
b6ee3d4a ACM |
702 | hcrx->ccid3hcrx_elapsed_time = |
703 | timeval_delta(&now, &packet->dccphrx_tstamp) / 10; | |
7c657876 ACM |
704 | if (hcrx->ccid3hcrx_p == 0) |
705 | hcrx->ccid3hcrx_pinv = ~0; | |
706 | else | |
707 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; | |
507d37cf | 708 | dp->dccps_hc_rx_insert_options = 1; |
7c657876 ACM |
709 | dccp_send_ack(sk); |
710 | } | |
711 | ||
2d0817d1 | 712 | static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 713 | { |
59d203f9 | 714 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
60fe62e7 | 715 | __be32 x_recv, pinv; |
7c657876 | 716 | |
59d203f9 ACM |
717 | BUG_ON(hcrx == NULL); |
718 | ||
719 | if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) | |
2d0817d1 | 720 | return 0; |
7c657876 | 721 | |
66a377c5 | 722 | DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; |
4fded33b ACM |
723 | |
724 | if (dccp_packet_without_ack(skb)) | |
2d0817d1 ACM |
725 | return 0; |
726 | ||
4fded33b ACM |
727 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
728 | pinv = htonl(hcrx->ccid3hcrx_pinv); | |
2d0817d1 ACM |
729 | |
730 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && | |
731 | dccp_insert_option_elapsed_time(sk, skb, | |
732 | hcrx->ccid3hcrx_elapsed_time)) || | |
733 | dccp_insert_option_timestamp(sk, skb) || | |
734 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, | |
735 | &pinv, sizeof(pinv)) || | |
736 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, | |
737 | &x_recv, sizeof(x_recv))) | |
738 | return -1; | |
739 | ||
740 | return 0; | |
7c657876 ACM |
741 | } |
742 | ||
7c657876 ACM |
743 | /* calculate first loss interval |
744 | * | |
745 | * returns estimated loss interval in usecs */ | |
746 | ||
747 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) | |
748 | { | |
59725dc2 | 749 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
8c60f3fa | 750 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
7c657876 | 751 | u32 rtt, delta, x_recv, fval, p, tmp2; |
b6ee3d4a | 752 | struct timeval tstamp = { 0, }; |
7c657876 ACM |
753 | int interval = 0; |
754 | int win_count = 0; | |
755 | int step = 0; | |
756 | u64 tmp1; | |
757 | ||
8c60f3fa ACM |
758 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
759 | dccphrx_node) { | |
760 | if (dccp_rx_hist_entry_data_packet(entry)) { | |
7c657876 ACM |
761 | tail = entry; |
762 | ||
763 | switch (step) { | |
764 | case 0: | |
8c60f3fa | 765 | tstamp = entry->dccphrx_tstamp; |
c1734376 | 766 | win_count = entry->dccphrx_ccval; |
7c657876 ACM |
767 | step = 1; |
768 | break; | |
769 | case 1: | |
c1734376 | 770 | interval = win_count - entry->dccphrx_ccval; |
7c657876 ACM |
771 | if (interval < 0) |
772 | interval += TFRC_WIN_COUNT_LIMIT; | |
773 | if (interval > 4) | |
774 | goto found; | |
775 | break; | |
776 | } | |
777 | } | |
778 | } | |
779 | ||
59d203f9 | 780 | if (unlikely(step == 0)) { |
59348b19 GR |
781 | DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", |
782 | dccp_role(sk), sk); | |
7c657876 ACM |
783 | return ~0; |
784 | } | |
785 | ||
59d203f9 | 786 | if (unlikely(interval == 0)) { |
59348b19 GR |
787 | DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." |
788 | "Defaulting to 1\n", dccp_role(sk), sk); | |
7c657876 ACM |
789 | interval = 1; |
790 | } | |
791 | found: | |
66a377c5 | 792 | if (!tail) { |
59348b19 | 793 | DCCP_CRIT("tail is null\n"); |
66a377c5 IM |
794 | return ~0; |
795 | } | |
b6ee3d4a | 796 | rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; |
7c657876 ACM |
797 | ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", |
798 | dccp_role(sk), sk, rtt); | |
59348b19 GR |
799 | |
800 | if (rtt == 0) { | |
801 | DCCP_WARN("RTT==0, setting to 1\n"); | |
802 | rtt = 1; | |
803 | } | |
7c657876 | 804 | |
b0e56780 ACM |
805 | dccp_timestamp(sk, &tstamp); |
806 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); | |
807 | x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); | |
7c657876 | 808 | |
66a377c5 IM |
809 | if (x_recv == 0) |
810 | x_recv = hcrx->ccid3hcrx_x_recv; | |
811 | ||
7c657876 ACM |
812 | tmp1 = (u64)x_recv * (u64)rtt; |
813 | do_div(tmp1,10000000); | |
814 | tmp2 = (u32)tmp1; | |
66a377c5 IM |
815 | |
816 | if (!tmp2) { | |
59348b19 | 817 | DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv, rtt); |
66a377c5 IM |
818 | return ~0; |
819 | } | |
820 | ||
7c657876 ACM |
821 | fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; |
822 | /* do not alter order above or you will get overflow on 32 bit */ | |
36729c1a | 823 | p = tfrc_calc_x_reverse_lookup(fval); |
1f2333ae ACM |
824 | ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " |
825 | "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); | |
7c657876 ACM |
826 | |
827 | if (p == 0) | |
828 | return ~0; | |
829 | else | |
830 | return 1000000 / p; | |
831 | } | |
832 | ||
833 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) | |
834 | { | |
59725dc2 | 835 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
fc747e82 | 836 | struct dccp_li_hist_entry *head; |
66a377c5 | 837 | u64 seq_temp; |
7c657876 | 838 | |
66a377c5 IM |
839 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
840 | if (!dccp_li_hist_interval_new(ccid3_li_hist, | |
841 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) | |
842 | return; | |
7c657876 | 843 | |
fc747e82 IM |
844 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
845 | struct dccp_li_hist_entry, dccplih_node); | |
846 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); | |
66a377c5 IM |
847 | } else { |
848 | struct dccp_li_hist_entry *entry; | |
849 | struct list_head *tail; | |
850 | ||
fc747e82 IM |
851 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
852 | struct dccp_li_hist_entry, dccplih_node); | |
66a377c5 IM |
853 | /* FIXME win count check removed as was wrong */ |
854 | /* should make this check with receive history */ | |
855 | /* and compare there as per section 10.2 of RFC4342 */ | |
856 | ||
857 | /* new loss event detected */ | |
858 | /* calculate last interval length */ | |
859 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); | |
860 | entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); | |
861 | ||
862 | if (entry == NULL) { | |
59348b19 | 863 | DCCP_BUG("out of memory - can not allocate entry"); |
ae6706f0 | 864 | return; |
66a377c5 IM |
865 | } |
866 | ||
867 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); | |
868 | ||
869 | tail = hcrx->ccid3hcrx_li_hist.prev; | |
870 | list_del(tail); | |
871 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); | |
872 | ||
873 | /* Create the newest interval */ | |
874 | entry->dccplih_seqno = seq_loss; | |
875 | entry->dccplih_interval = seq_temp; | |
876 | entry->dccplih_win_count = win_loss; | |
877 | } | |
7c657876 ACM |
878 | } |
879 | ||
66a377c5 IM |
880 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
881 | struct dccp_rx_hist_entry *packet) | |
7c657876 | 882 | { |
59725dc2 | 883 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
66a377c5 IM |
884 | struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
885 | u64 seqno = packet->dccphrx_seqno; | |
886 | u64 tmp_seqno; | |
887 | int loss = 0; | |
888 | u8 ccval; | |
889 | ||
890 | ||
891 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
892 | ||
893 | if (!rx_hist || | |
894 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
895 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
896 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
897 | goto detect_out; | |
898 | } | |
899 | ||
7c657876 | 900 | |
66a377c5 IM |
901 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
902 | > TFRC_RECV_NUM_LATE_LOSS) { | |
903 | loss = 1; | |
904 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, | |
905 | hcrx->ccid3hcrx_ccval_nonloss); | |
906 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
907 | dccp_inc_seqno(&tmp_seqno); | |
908 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
909 | dccp_inc_seqno(&tmp_seqno); | |
910 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, | |
911 | tmp_seqno, &ccval)) { | |
912 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
913 | hcrx->ccid3hcrx_ccval_nonloss = ccval; | |
914 | dccp_inc_seqno(&tmp_seqno); | |
915 | } | |
916 | } | |
917 | ||
918 | /* FIXME - this code could be simplified with above while */ | |
919 | /* but works at moment */ | |
920 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
921 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
922 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
923 | } | |
924 | ||
925 | detect_out: | |
926 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, | |
927 | &hcrx->ccid3hcrx_li_hist, packet, | |
928 | hcrx->ccid3hcrx_seqno_nonloss); | |
929 | return loss; | |
7c657876 ACM |
930 | } |
931 | ||
7c657876 ACM |
932 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
933 | { | |
59725dc2 | 934 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
4fded33b | 935 | const struct dccp_options_received *opt_recv; |
8c60f3fa | 936 | struct dccp_rx_hist_entry *packet; |
7c657876 | 937 | struct timeval now; |
66a377c5 IM |
938 | u32 p_prev, rtt_prev, r_sample, t_elapsed; |
939 | int loss; | |
1f2333ae | 940 | |
59348b19 | 941 | BUG_ON(hcrx == NULL); |
7c657876 | 942 | |
59725dc2 | 943 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
4fded33b | 944 | |
7c657876 ACM |
945 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
946 | case DCCP_PKT_ACK: | |
947 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
948 | return; | |
949 | case DCCP_PKT_DATAACK: | |
4fded33b | 950 | if (opt_recv->dccpor_timestamp_echo == 0) |
7c657876 | 951 | break; |
66a377c5 | 952 | rtt_prev = hcrx->ccid3hcrx_rtt; |
b0e56780 | 953 | dccp_timestamp(sk, &now); |
b3a3077d ACM |
954 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
955 | r_sample = timeval_usecs(&now); | |
956 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; | |
957 | ||
958 | if (unlikely(r_sample <= t_elapsed)) | |
59348b19 GR |
959 | DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", |
960 | r_sample, t_elapsed); | |
b3a3077d ACM |
961 | else |
962 | r_sample -= t_elapsed; | |
963 | ||
964 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
965 | hcrx->ccid3hcrx_rtt = r_sample; | |
966 | else | |
967 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + | |
968 | r_sample / 10; | |
969 | ||
66a377c5 IM |
970 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
971 | ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", | |
4fded33b ACM |
972 | dccp_role(sk), hcrx->ccid3hcrx_rtt, |
973 | opt_recv->dccpor_elapsed_time); | |
7c657876 ACM |
974 | break; |
975 | case DCCP_PKT_DATA: | |
976 | break; | |
59d203f9 | 977 | default: /* We're not interested in other packet types, move along */ |
7c657876 ACM |
978 | return; |
979 | } | |
980 | ||
b0e56780 | 981 | packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, |
8c60f3fa | 982 | skb, SLAB_ATOMIC); |
59d203f9 | 983 | if (unlikely(packet == NULL)) { |
59348b19 GR |
984 | DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " |
985 | "to history, consider it lost!\n", dccp_role(sk), sk); | |
7c657876 ACM |
986 | return; |
987 | } | |
988 | ||
66a377c5 | 989 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
7c657876 ACM |
990 | |
991 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) | |
992 | return; | |
993 | ||
994 | switch (hcrx->ccid3hcrx_state) { | |
995 | case TFRC_RSTATE_NO_DATA: | |
1f2333ae ACM |
996 | ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " |
997 | "feedback\n", | |
998 | dccp_role(sk), sk, | |
999 | dccp_state_name(sk->sk_state), skb); | |
7c657876 ACM |
1000 | ccid3_hc_rx_send_feedback(sk); |
1001 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); | |
1002 | return; | |
1003 | case TFRC_RSTATE_DATA: | |
1f2333ae ACM |
1004 | hcrx->ccid3hcrx_bytes_recv += skb->len - |
1005 | dccp_hdr(skb)->dccph_doff * 4; | |
66a377c5 | 1006 | if (loss) |
b6ee3d4a ACM |
1007 | break; |
1008 | ||
b0e56780 | 1009 | dccp_timestamp(sk, &now); |
b6ee3d4a ACM |
1010 | if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= |
1011 | hcrx->ccid3hcrx_rtt) { | |
1012 | hcrx->ccid3hcrx_tstamp_last_ack = now; | |
1013 | ccid3_hc_rx_send_feedback(sk); | |
7c657876 | 1014 | } |
b6ee3d4a | 1015 | return; |
59348b19 GR |
1016 | case TFRC_RSTATE_TERM: |
1017 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
1018 | return; |
1019 | } | |
1020 | ||
1021 | /* Dealing with packet loss */ | |
4fded33b ACM |
1022 | ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", |
1023 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); | |
7c657876 | 1024 | |
7c657876 ACM |
1025 | p_prev = hcrx->ccid3hcrx_p; |
1026 | ||
1027 | /* Calculate loss event rate */ | |
c0996660 IM |
1028 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
1029 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); | |
1030 | ||
7c657876 | 1031 | /* Scaling up by 1000000 as fixed decimal */ |
c0996660 IM |
1032 | if (i_mean != 0) |
1033 | hcrx->ccid3hcrx_p = 1000000 / i_mean; | |
59348b19 GR |
1034 | } else |
1035 | DCCP_BUG("empty loss history"); | |
7c657876 ACM |
1036 | |
1037 | if (hcrx->ccid3hcrx_p > p_prev) { | |
1038 | ccid3_hc_rx_send_feedback(sk); | |
1039 | return; | |
1040 | } | |
1041 | } | |
1042 | ||
91f0ebf7 | 1043 | static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) |
7c657876 ACM |
1044 | { |
1045 | struct dccp_sock *dp = dccp_sk(sk); | |
91f0ebf7 | 1046 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
7c657876 ACM |
1047 | |
1048 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
1049 | ||
a84ffe43 ACM |
1050 | if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && |
1051 | dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) | |
1052 | hcrx->ccid3hcrx_s = dp->dccps_packet_size; | |
7c657876 ACM |
1053 | else |
1054 | hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE; | |
1055 | ||
1056 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; | |
1057 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); | |
ae6706f0 | 1058 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
b0e56780 | 1059 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
954ee31f ACM |
1060 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
1061 | hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ | |
7c657876 ACM |
1062 | return 0; |
1063 | } | |
1064 | ||
1065 | static void ccid3_hc_rx_exit(struct sock *sk) | |
1066 | { | |
59725dc2 | 1067 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 1068 | |
59d203f9 | 1069 | BUG_ON(hcrx == NULL); |
7c657876 ACM |
1070 | |
1071 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); | |
1072 | ||
1073 | /* Empty packet history */ | |
8c60f3fa | 1074 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
7c657876 ACM |
1075 | |
1076 | /* Empty loss interval history */ | |
ae6706f0 | 1077 | dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); |
7c657876 ACM |
1078 | } |
1079 | ||
2babe1f6 ACM |
1080 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
1081 | { | |
59725dc2 | 1082 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
2babe1f6 | 1083 | |
59c2353d ACM |
1084 | /* Listen socks doesn't have a private CCID block */ |
1085 | if (sk->sk_state == DCCP_LISTEN) | |
1086 | return; | |
1087 | ||
59d203f9 | 1088 | BUG_ON(hcrx == NULL); |
2babe1f6 ACM |
1089 | |
1090 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; | |
1091 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; | |
1092 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; | |
1093 | } | |
1094 | ||
1095 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) | |
1096 | { | |
59725dc2 | 1097 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
2babe1f6 | 1098 | |
59c2353d ACM |
1099 | /* Listen socks doesn't have a private CCID block */ |
1100 | if (sk->sk_state == DCCP_LISTEN) | |
1101 | return; | |
1102 | ||
59d203f9 | 1103 | BUG_ON(hctx == NULL); |
2babe1f6 ACM |
1104 | |
1105 | info->tcpi_rto = hctx->ccid3hctx_t_rto; | |
1106 | info->tcpi_rtt = hctx->ccid3hctx_rtt; | |
1107 | } | |
1108 | ||
88f964db ACM |
1109 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
1110 | u32 __user *optval, int __user *optlen) | |
1111 | { | |
1112 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); | |
1113 | const void *val; | |
1114 | ||
1115 | /* Listen socks doesn't have a private CCID block */ | |
1116 | if (sk->sk_state == DCCP_LISTEN) | |
1117 | return -EINVAL; | |
1118 | ||
1119 | switch (optname) { | |
1120 | case DCCP_SOCKOPT_CCID_RX_INFO: | |
1121 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) | |
1122 | return -EINVAL; | |
1123 | len = sizeof(hcrx->ccid3hcrx_tfrc); | |
1124 | val = &hcrx->ccid3hcrx_tfrc; | |
1125 | break; | |
1126 | default: | |
1127 | return -ENOPROTOOPT; | |
1128 | } | |
1129 | ||
1130 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1131 | return -EFAULT; | |
1132 | ||
1133 | return 0; | |
1134 | } | |
1135 | ||
1136 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, | |
1137 | u32 __user *optval, int __user *optlen) | |
1138 | { | |
1139 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
1140 | const void *val; | |
1141 | ||
1142 | /* Listen socks doesn't have a private CCID block */ | |
1143 | if (sk->sk_state == DCCP_LISTEN) | |
1144 | return -EINVAL; | |
1145 | ||
1146 | switch (optname) { | |
1147 | case DCCP_SOCKOPT_CCID_TX_INFO: | |
1148 | if (len < sizeof(hctx->ccid3hctx_tfrc)) | |
1149 | return -EINVAL; | |
1150 | len = sizeof(hctx->ccid3hctx_tfrc); | |
1151 | val = &hctx->ccid3hctx_tfrc; | |
1152 | break; | |
1153 | default: | |
1154 | return -ENOPROTOOPT; | |
1155 | } | |
1156 | ||
1157 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1158 | return -EFAULT; | |
1159 | ||
1160 | return 0; | |
1161 | } | |
1162 | ||
91f0ebf7 | 1163 | static struct ccid_operations ccid3 = { |
3dd9a7c3 | 1164 | .ccid_id = DCCPC_CCID3, |
7c657876 ACM |
1165 | .ccid_name = "ccid3", |
1166 | .ccid_owner = THIS_MODULE, | |
91f0ebf7 | 1167 | .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), |
7c657876 ACM |
1168 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
1169 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, | |
1170 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, | |
1171 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, | |
1172 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, | |
1173 | .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, | |
1174 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, | |
91f0ebf7 | 1175 | .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), |
7c657876 ACM |
1176 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
1177 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, | |
1178 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, | |
1179 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, | |
2babe1f6 ACM |
1180 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
1181 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, | |
88f964db ACM |
1182 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
1183 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, | |
7c657876 ACM |
1184 | }; |
1185 | ||
56724aa4 | 1186 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
1187 | module_param(ccid3_debug, int, 0444); |
1188 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); | |
56724aa4 | 1189 | #endif |
7c657876 ACM |
1190 | |
1191 | static __init int ccid3_module_init(void) | |
1192 | { | |
8c60f3fa | 1193 | int rc = -ENOBUFS; |
7c657876 | 1194 | |
8c60f3fa ACM |
1195 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
1196 | if (ccid3_rx_hist == NULL) | |
7c657876 ACM |
1197 | goto out; |
1198 | ||
8c60f3fa ACM |
1199 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
1200 | if (ccid3_tx_hist == NULL) | |
1201 | goto out_free_rx; | |
7c657876 | 1202 | |
ae6706f0 ACM |
1203 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
1204 | if (ccid3_li_hist == NULL) | |
8c60f3fa | 1205 | goto out_free_tx; |
7c657876 ACM |
1206 | |
1207 | rc = ccid_register(&ccid3); | |
1208 | if (rc != 0) | |
1209 | goto out_free_loss_interval_history; | |
7c657876 ACM |
1210 | out: |
1211 | return rc; | |
8c60f3fa | 1212 | |
7c657876 | 1213 | out_free_loss_interval_history: |
ae6706f0 ACM |
1214 | dccp_li_hist_delete(ccid3_li_hist); |
1215 | ccid3_li_hist = NULL; | |
8c60f3fa ACM |
1216 | out_free_tx: |
1217 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1218 | ccid3_tx_hist = NULL; | |
1219 | out_free_rx: | |
1220 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1221 | ccid3_rx_hist = NULL; | |
7c657876 ACM |
1222 | goto out; |
1223 | } | |
1224 | module_init(ccid3_module_init); | |
1225 | ||
1226 | static __exit void ccid3_module_exit(void) | |
1227 | { | |
1228 | ccid_unregister(&ccid3); | |
1229 | ||
8c60f3fa ACM |
1230 | if (ccid3_tx_hist != NULL) { |
1231 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1232 | ccid3_tx_hist = NULL; | |
7c657876 | 1233 | } |
8c60f3fa ACM |
1234 | if (ccid3_rx_hist != NULL) { |
1235 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1236 | ccid3_rx_hist = NULL; | |
7c657876 | 1237 | } |
ae6706f0 ACM |
1238 | if (ccid3_li_hist != NULL) { |
1239 | dccp_li_hist_delete(ccid3_li_hist); | |
1240 | ccid3_li_hist = NULL; | |
7c657876 ACM |
1241 | } |
1242 | } | |
1243 | module_exit(ccid3_module_exit); | |
1244 | ||
e6bccd35 | 1245 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
1f2333ae | 1246 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
7c657876 ACM |
1247 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
1248 | MODULE_LICENSE("GPL"); | |
1249 | MODULE_ALIAS("net-dccp-ccid-3"); |