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 | |
8a508ac2 GR |
248 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
249 | * See comments in packet_recv() regarding the value of t_RTO. | |
6b5e633a | 250 | */ |
8a508ac2 | 251 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
7c657876 | 252 | break; |
59348b19 GR |
253 | case TFRC_SSTATE_NO_SENT: |
254 | DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); | |
255 | /* fall through */ | |
256 | case TFRC_SSTATE_TERM: | |
7c657876 ACM |
257 | goto out; |
258 | } | |
259 | ||
7c657876 | 260 | hctx->ccid3hctx_idle = 1; |
48e03eee GR |
261 | |
262 | restart_timer: | |
263 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
2a1fda6f | 264 | jiffies + usecs_to_jiffies(t_nfb)); |
7c657876 ACM |
265 | out: |
266 | bh_unlock_sock(sk); | |
267 | sock_put(sk); | |
268 | } | |
269 | ||
7da7f456 GR |
270 | /* |
271 | * returns | |
272 | * > 0: delay (in msecs) that should pass before actually sending | |
273 | * = 0: can send immediately | |
274 | * < 0: error condition; do not send packet | |
275 | */ | |
6b57c93d | 276 | static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
277 | { |
278 | struct dccp_sock *dp = dccp_sk(sk); | |
59725dc2 | 279 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
8c60f3fa | 280 | struct dccp_tx_hist_entry *new_packet; |
7c657876 | 281 | struct timeval now; |
27258ee5 | 282 | long delay; |
7c657876 | 283 | |
59348b19 | 284 | BUG_ON(hctx == NULL); |
1f2333ae | 285 | |
7c657876 | 286 | /* |
da335baf GR |
287 | * This function is called only for Data and DataAck packets. Sending |
288 | * zero-sized Data(Ack)s is theoretically possible, but for congestion | |
289 | * control this case is pathological - ignore it. | |
7c657876 | 290 | */ |
6b57c93d | 291 | if (unlikely(skb->len == 0)) |
da335baf | 292 | return -EBADMSG; |
7c657876 ACM |
293 | |
294 | /* See if last packet allocated was not sent */ | |
8c60f3fa ACM |
295 | new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
296 | if (new_packet == NULL || new_packet->dccphtx_sent) { | |
1f2333ae ACM |
297 | new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, |
298 | SLAB_ATOMIC); | |
7c657876 | 299 | |
59d203f9 | 300 | if (unlikely(new_packet == NULL)) { |
59348b19 GR |
301 | DCCP_WARN("%s, sk=%p, not enough mem to add to history," |
302 | "send refused\n", dccp_role(sk), sk); | |
7da7f456 | 303 | return -ENOBUFS; |
7c657876 ACM |
304 | } |
305 | ||
8c60f3fa | 306 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); |
7c657876 ACM |
307 | } |
308 | ||
b0e56780 | 309 | dccp_timestamp(sk, &now); |
7c657876 ACM |
310 | |
311 | switch (hctx->ccid3hctx_state) { | |
312 | case TFRC_SSTATE_NO_SENT: | |
1f2333ae ACM |
313 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
314 | jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); | |
7c657876 ACM |
315 | hctx->ccid3hctx_last_win_count = 0; |
316 | hctx->ccid3hctx_t_last_win_count = now; | |
317 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); | |
7c657876 | 318 | |
78ad713d | 319 | /* Set initial sending rate to 1 packet per second */ |
6b57c93d | 320 | ccid3_hc_tx_update_s(hctx, skb->len); |
78ad713d GR |
321 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; |
322 | ||
90feeb95 GR |
323 | /* First timeout, according to [RFC 3448, 4.2], is 1 second */ |
324 | hctx->ccid3hctx_t_ipi = USEC_PER_SEC; | |
325 | /* Initial delta: minimum of 0.5 sec and t_gran/2 */ | |
326 | hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; | |
327 | ||
328 | /* Set t_0 for initial packet */ | |
7c657876 | 329 | hctx->ccid3hctx_t_nom = now; |
7c657876 ACM |
330 | break; |
331 | case TFRC_SSTATE_NO_FBACK: | |
332 | case TFRC_SSTATE_FBACK: | |
91cf5a17 GR |
333 | delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); |
334 | /* | |
335 | * Scheduling of packet transmissions [RFC 3448, 4.6] | |
336 | * | |
337 | * if (t_now > t_nom - delta) | |
338 | * // send the packet now | |
339 | * else | |
340 | * // send the packet in (t_nom - t_now) milliseconds. | |
341 | */ | |
76d12777 | 342 | if (delay - (long)hctx->ccid3hctx_delta >= 0) |
7da7f456 | 343 | return delay / 1000L; |
7c657876 | 344 | break; |
59348b19 GR |
345 | case TFRC_SSTATE_TERM: |
346 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7da7f456 | 347 | return -EINVAL; |
7c657876 ACM |
348 | } |
349 | ||
7da7f456 GR |
350 | /* prepare to send now (add options etc.) */ |
351 | dp->dccps_hc_tx_insert_options = 1; | |
352 | new_packet->dccphtx_ccval = DCCP_SKB_CB(skb)->dccpd_ccval = | |
353 | hctx->ccid3hctx_last_win_count; | |
354 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); | |
355 | ||
356 | return 0; | |
7c657876 ACM |
357 | } |
358 | ||
6b57c93d | 359 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len) |
7c657876 | 360 | { |
59725dc2 ACM |
361 | const struct dccp_sock *dp = dccp_sk(sk); |
362 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 | 363 | struct timeval now; |
6b57c93d GR |
364 | unsigned long quarter_rtt; |
365 | struct dccp_tx_hist_entry *packet; | |
7c657876 | 366 | |
59348b19 | 367 | BUG_ON(hctx == NULL); |
7c657876 | 368 | |
b0e56780 | 369 | dccp_timestamp(sk, &now); |
7c657876 | 370 | |
6b57c93d | 371 | ccid3_hc_tx_update_s(hctx, len); |
7c657876 | 372 | |
6b57c93d GR |
373 | packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
374 | if (unlikely(packet == NULL)) { | |
375 | DCCP_WARN("packet doesn't exist in history!\n"); | |
376 | return; | |
377 | } | |
378 | if (unlikely(packet->dccphtx_sent)) { | |
379 | DCCP_WARN("no unsent packet in history!\n"); | |
380 | return; | |
381 | } | |
382 | packet->dccphtx_tstamp = now; | |
383 | packet->dccphtx_seqno = dp->dccps_gss; | |
384 | /* | |
385 | * Check if win_count have changed | |
386 | * Algorithm in "8.1. Window Counter Value" in RFC 4342. | |
387 | */ | |
388 | quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); | |
389 | if (likely(hctx->ccid3hctx_rtt > 8)) | |
390 | quarter_rtt /= hctx->ccid3hctx_rtt / 4; | |
78ad713d | 391 | |
6b57c93d GR |
392 | if (quarter_rtt > 0) { |
393 | hctx->ccid3hctx_t_last_win_count = now; | |
394 | hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + | |
395 | min_t(unsigned long, quarter_rtt, 5)) % 16; | |
396 | ccid3_pr_debug("%s, sk=%p, window changed from " | |
397 | "%u to %u!\n", | |
398 | dccp_role(sk), sk, | |
399 | packet->dccphtx_ccval, | |
400 | hctx->ccid3hctx_last_win_count); | |
401 | } | |
1f2333ae | 402 | |
6b57c93d GR |
403 | hctx->ccid3hctx_idle = 0; |
404 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; | |
405 | packet->dccphtx_sent = 1; | |
7c657876 ACM |
406 | } |
407 | ||
408 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) | |
409 | { | |
59725dc2 ACM |
410 | const struct dccp_sock *dp = dccp_sk(sk); |
411 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 | 412 | struct ccid3_options_received *opt_recv; |
8c60f3fa | 413 | struct dccp_tx_hist_entry *packet; |
b0e56780 | 414 | struct timeval now; |
2a1fda6f | 415 | unsigned long t_nfb; |
1bc09869 | 416 | u32 t_elapsed; |
7c657876 ACM |
417 | u32 pinv; |
418 | u32 x_recv; | |
419 | u32 r_sample; | |
1f2333ae | 420 | |
59348b19 | 421 | BUG_ON(hctx == NULL); |
7c657876 ACM |
422 | |
423 | /* we are only interested in ACKs */ | |
424 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || | |
425 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) | |
426 | return; | |
427 | ||
428 | opt_recv = &hctx->ccid3hctx_options_received; | |
429 | ||
1a28599a | 430 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; |
7c657876 ACM |
431 | x_recv = opt_recv->ccid3or_receive_rate; |
432 | pinv = opt_recv->ccid3or_loss_event_rate; | |
433 | ||
434 | switch (hctx->ccid3hctx_state) { | |
7c657876 ACM |
435 | case TFRC_SSTATE_NO_FBACK: |
436 | case TFRC_SSTATE_FBACK: | |
437 | /* Calculate new round trip sample by | |
438 | * R_sample = (now - t_recvdata) - t_delay */ | |
439 | /* get t_recvdata from history */ | |
8c60f3fa ACM |
440 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
441 | DCCP_SKB_CB(skb)->dccpd_ack_seq); | |
59d203f9 | 442 | if (unlikely(packet == NULL)) { |
59348b19 GR |
443 | DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist " |
444 | "in history!\n", dccp_role(sk), sk, | |
59d203f9 | 445 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
59348b19 | 446 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
7c657876 ACM |
447 | return; |
448 | } | |
449 | ||
450 | /* Update RTT */ | |
b0e56780 ACM |
451 | dccp_timestamp(sk, &now); |
452 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); | |
1a28599a | 453 | if (unlikely(r_sample <= t_elapsed)) |
59348b19 GR |
454 | DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n", |
455 | r_sample, t_elapsed); | |
1a28599a ACM |
456 | else |
457 | r_sample -= t_elapsed; | |
7c657876 ACM |
458 | |
459 | /* Update RTT estimate by | |
460 | * If (No feedback recv) | |
461 | * R = R_sample; | |
462 | * Else | |
463 | * R = q * R + (1 - q) * R_sample; | |
464 | * | |
465 | * q is a constant, RFC 3448 recomments 0.9 | |
466 | */ | |
467 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { | |
a79ef76f GR |
468 | /* Use Larger Initial Windows [RFC 4342, sec. 5] |
469 | * We deviate in that we use `s' instead of `MSS'. */ | |
470 | u16 w_init = max( 4 * hctx->ccid3hctx_s, | |
471 | max(2 * hctx->ccid3hctx_s, 4380)); | |
472 | hctx->ccid3hctx_rtt = r_sample; | |
473 | hctx->ccid3hctx_x = usecs_div(w_init, r_sample); | |
474 | hctx->ccid3hctx_t_ld = now; | |
475 | ||
476 | ccid3_update_send_time(hctx); | |
7c657876 | 477 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); |
a79ef76f | 478 | } else { |
1f2333ae ACM |
479 | hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + |
480 | r_sample / 10; | |
a79ef76f GR |
481 | ccid3_hc_tx_update_x(sk, &now); |
482 | } | |
7c657876 | 483 | |
1f2333ae ACM |
484 | ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " |
485 | "r_sample=%us\n", dccp_role(sk), sk, | |
486 | hctx->ccid3hctx_rtt, r_sample); | |
7c657876 | 487 | |
7c657876 | 488 | /* Update receive rate */ |
1f2333ae | 489 | hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ |
7c657876 ACM |
490 | |
491 | /* Update loss event rate */ | |
492 | if (pinv == ~0 || pinv == 0) | |
493 | hctx->ccid3hctx_p = 0; | |
494 | else { | |
495 | hctx->ccid3hctx_p = 1000000 / pinv; | |
496 | ||
497 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { | |
498 | hctx->ccid3hctx_p = TFRC_SMALLEST_P; | |
1f2333ae ACM |
499 | ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", |
500 | dccp_role(sk), sk); | |
7c657876 ACM |
501 | } |
502 | } | |
503 | ||
504 | /* unschedule no feedback timer */ | |
505 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
506 | ||
7c657876 | 507 | /* remove all packets older than the one acked from history */ |
8c60f3fa ACM |
508 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
509 | &hctx->ccid3hctx_hist, packet); | |
c530cfb1 ACM |
510 | /* |
511 | * As we have calculated new ipi, delta, t_nom it is possible that | |
5d0dbc4a | 512 | * we now can send a packet, so wake up dccp_wait_for_ccid |
c530cfb1 ACM |
513 | */ |
514 | sk->sk_write_space(sk); | |
8c60f3fa | 515 | |
8a508ac2 GR |
516 | /* |
517 | * Update timeout interval for the nofeedback timer. | |
518 | * We use a configuration option to increase the lower bound. | |
519 | * This can help avoid triggering the nofeedback timer too often | |
520 | * ('spinning') on LANs with small RTTs. | |
521 | */ | |
5d0dbc4a | 522 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
8a508ac2 GR |
523 | CONFIG_IP_DCCP_CCID3_RTO * |
524 | (USEC_PER_SEC/1000) ); | |
1f2333ae ACM |
525 | /* |
526 | * Schedule no feedback timer to expire in | |
8a508ac2 | 527 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
1f2333ae | 528 | */ |
8a508ac2 | 529 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
6b5e633a | 530 | |
1f2333ae ACM |
531 | ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " |
532 | "expire in %lu jiffies (%luus)\n", | |
533 | dccp_role(sk), sk, | |
2a1fda6f | 534 | usecs_to_jiffies(t_nfb), t_nfb); |
7c657876 ACM |
535 | |
536 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
2a1fda6f | 537 | jiffies + usecs_to_jiffies(t_nfb)); |
7c657876 ACM |
538 | |
539 | /* set idle flag */ | |
540 | hctx->ccid3hctx_idle = 1; | |
541 | break; | |
5e19e3fc GR |
542 | case TFRC_SSTATE_NO_SENT: |
543 | DCCP_WARN("Illegal ACK received - no packet has been sent\n"); | |
544 | /* fall through */ | |
545 | case TFRC_SSTATE_TERM: /* ignore feedback when closing */ | |
7c657876 ACM |
546 | break; |
547 | } | |
548 | } | |
549 | ||
2d0817d1 | 550 | static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 551 | { |
59d203f9 | 552 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 553 | |
59d203f9 ACM |
554 | BUG_ON(hctx == NULL); |
555 | ||
2d0817d1 ACM |
556 | if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) |
557 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; | |
558 | return 0; | |
7c657876 ACM |
559 | } |
560 | ||
561 | static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, | |
1f2333ae ACM |
562 | unsigned char len, u16 idx, |
563 | unsigned char *value) | |
7c657876 ACM |
564 | { |
565 | int rc = 0; | |
59725dc2 ACM |
566 | const struct dccp_sock *dp = dccp_sk(sk); |
567 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 ACM |
568 | struct ccid3_options_received *opt_recv; |
569 | ||
59d203f9 | 570 | BUG_ON(hctx == NULL); |
7c657876 ACM |
571 | |
572 | opt_recv = &hctx->ccid3hctx_options_received; | |
573 | ||
574 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { | |
575 | opt_recv->ccid3or_seqno = dp->dccps_gsr; | |
576 | opt_recv->ccid3or_loss_event_rate = ~0; | |
577 | opt_recv->ccid3or_loss_intervals_idx = 0; | |
578 | opt_recv->ccid3or_loss_intervals_len = 0; | |
579 | opt_recv->ccid3or_receive_rate = 0; | |
580 | } | |
581 | ||
582 | switch (option) { | |
583 | case TFRC_OPT_LOSS_EVENT_RATE: | |
59d203f9 | 584 | if (unlikely(len != 4)) { |
59348b19 GR |
585 | DCCP_WARN("%s, sk=%p, invalid len %d " |
586 | "for TFRC_OPT_LOSS_EVENT_RATE\n", | |
587 | dccp_role(sk), sk, len); | |
7c657876 ACM |
588 | rc = -EINVAL; |
589 | } else { | |
60fe62e7 | 590 | opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
591 | ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", |
592 | dccp_role(sk), sk, | |
593 | opt_recv->ccid3or_loss_event_rate); | |
594 | } | |
595 | break; | |
596 | case TFRC_OPT_LOSS_INTERVALS: | |
597 | opt_recv->ccid3or_loss_intervals_idx = idx; | |
598 | opt_recv->ccid3or_loss_intervals_len = len; | |
599 | ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", | |
600 | dccp_role(sk), sk, | |
601 | opt_recv->ccid3or_loss_intervals_idx, | |
602 | opt_recv->ccid3or_loss_intervals_len); | |
603 | break; | |
604 | case TFRC_OPT_RECEIVE_RATE: | |
59d203f9 | 605 | if (unlikely(len != 4)) { |
59348b19 GR |
606 | DCCP_WARN("%s, sk=%p, invalid len %d " |
607 | "for TFRC_OPT_RECEIVE_RATE\n", | |
608 | dccp_role(sk), sk, len); | |
7c657876 ACM |
609 | rc = -EINVAL; |
610 | } else { | |
60fe62e7 | 611 | opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
612 | ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", |
613 | dccp_role(sk), sk, | |
614 | opt_recv->ccid3or_receive_rate); | |
615 | } | |
616 | break; | |
617 | } | |
618 | ||
619 | return rc; | |
620 | } | |
621 | ||
91f0ebf7 | 622 | static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) |
7c657876 | 623 | { |
91f0ebf7 | 624 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
7c657876 | 625 | |
78ad713d | 626 | hctx->ccid3hctx_s = 0; |
7c657876 ACM |
627 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
628 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); | |
aa5d7df3 ACM |
629 | |
630 | hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; | |
631 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; | |
7c657876 ACM |
632 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
637 | static void ccid3_hc_tx_exit(struct sock *sk) | |
638 | { | |
59725dc2 | 639 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 640 | |
7c657876 ACM |
641 | BUG_ON(hctx == NULL); |
642 | ||
643 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); | |
644 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
645 | ||
646 | /* Empty packet history */ | |
8c60f3fa | 647 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
7c657876 ACM |
648 | } |
649 | ||
650 | /* | |
651 | * RX Half Connection methods | |
652 | */ | |
653 | ||
56724aa4 | 654 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
655 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
656 | { | |
657 | static char *ccid3_rx_state_names[] = { | |
658 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", | |
659 | [TFRC_RSTATE_DATA] = "DATA", | |
660 | [TFRC_RSTATE_TERM] = "TERM", | |
661 | }; | |
662 | ||
663 | return ccid3_rx_state_names[state]; | |
664 | } | |
665 | #endif | |
666 | ||
c25a18ba ACM |
667 | static void ccid3_hc_rx_set_state(struct sock *sk, |
668 | enum ccid3_hc_rx_states state) | |
7c657876 | 669 | { |
59725dc2 | 670 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 ACM |
671 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
672 | ||
673 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
674 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
675 | ccid3_rx_state_name(state)); | |
7c657876 ACM |
676 | WARN_ON(state == oldstate); |
677 | hcrx->ccid3hcrx_state = state; | |
678 | } | |
679 | ||
78ad713d GR |
680 | static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) |
681 | { | |
682 | if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ | |
683 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); | |
684 | else | |
685 | hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : | |
686 | (9 * hcrx->ccid3hcrx_s + len) / 10; | |
687 | } | |
688 | ||
7c657876 ACM |
689 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
690 | { | |
59725dc2 | 691 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 692 | struct dccp_sock *dp = dccp_sk(sk); |
8c60f3fa | 693 | struct dccp_rx_hist_entry *packet; |
b6ee3d4a | 694 | struct timeval now; |
7c657876 ACM |
695 | |
696 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
697 | ||
b0e56780 | 698 | dccp_timestamp(sk, &now); |
b6ee3d4a | 699 | |
7c657876 ACM |
700 | switch (hcrx->ccid3hcrx_state) { |
701 | case TFRC_RSTATE_NO_DATA: | |
702 | hcrx->ccid3hcrx_x_recv = 0; | |
703 | break; | |
704 | case TFRC_RSTATE_DATA: { | |
b6ee3d4a ACM |
705 | const u32 delta = timeval_delta(&now, |
706 | &hcrx->ccid3hcrx_tstamp_last_feedback); | |
27ae543e ACM |
707 | hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, |
708 | delta); | |
7c657876 ACM |
709 | } |
710 | break; | |
59348b19 GR |
711 | case TFRC_RSTATE_TERM: |
712 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
713 | return; |
714 | } | |
715 | ||
8c60f3fa | 716 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
59d203f9 | 717 | if (unlikely(packet == NULL)) { |
59348b19 GR |
718 | DCCP_WARN("%s, sk=%p, no data packet in history!\n", |
719 | dccp_role(sk), sk); | |
7c657876 ACM |
720 | return; |
721 | } | |
722 | ||
b6ee3d4a | 723 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
66a377c5 | 724 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
7c657876 ACM |
725 | hcrx->ccid3hcrx_bytes_recv = 0; |
726 | ||
727 | /* Convert to multiples of 10us */ | |
b6ee3d4a ACM |
728 | hcrx->ccid3hcrx_elapsed_time = |
729 | timeval_delta(&now, &packet->dccphrx_tstamp) / 10; | |
7c657876 ACM |
730 | if (hcrx->ccid3hcrx_p == 0) |
731 | hcrx->ccid3hcrx_pinv = ~0; | |
732 | else | |
733 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; | |
507d37cf | 734 | dp->dccps_hc_rx_insert_options = 1; |
7c657876 ACM |
735 | dccp_send_ack(sk); |
736 | } | |
737 | ||
2d0817d1 | 738 | static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 739 | { |
59d203f9 | 740 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
60fe62e7 | 741 | __be32 x_recv, pinv; |
7c657876 | 742 | |
59d203f9 ACM |
743 | BUG_ON(hcrx == NULL); |
744 | ||
745 | if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) | |
2d0817d1 | 746 | return 0; |
7c657876 | 747 | |
66a377c5 | 748 | DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; |
4fded33b ACM |
749 | |
750 | if (dccp_packet_without_ack(skb)) | |
2d0817d1 ACM |
751 | return 0; |
752 | ||
4fded33b ACM |
753 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
754 | pinv = htonl(hcrx->ccid3hcrx_pinv); | |
2d0817d1 ACM |
755 | |
756 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && | |
757 | dccp_insert_option_elapsed_time(sk, skb, | |
758 | hcrx->ccid3hcrx_elapsed_time)) || | |
759 | dccp_insert_option_timestamp(sk, skb) || | |
760 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, | |
761 | &pinv, sizeof(pinv)) || | |
762 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, | |
763 | &x_recv, sizeof(x_recv))) | |
764 | return -1; | |
765 | ||
766 | return 0; | |
7c657876 ACM |
767 | } |
768 | ||
7c657876 ACM |
769 | /* calculate first loss interval |
770 | * | |
771 | * returns estimated loss interval in usecs */ | |
772 | ||
773 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) | |
774 | { | |
59725dc2 | 775 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
8c60f3fa | 776 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
7c657876 | 777 | u32 rtt, delta, x_recv, fval, p, tmp2; |
b6ee3d4a | 778 | struct timeval tstamp = { 0, }; |
7c657876 ACM |
779 | int interval = 0; |
780 | int win_count = 0; | |
781 | int step = 0; | |
782 | u64 tmp1; | |
783 | ||
8c60f3fa ACM |
784 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
785 | dccphrx_node) { | |
786 | if (dccp_rx_hist_entry_data_packet(entry)) { | |
7c657876 ACM |
787 | tail = entry; |
788 | ||
789 | switch (step) { | |
790 | case 0: | |
8c60f3fa | 791 | tstamp = entry->dccphrx_tstamp; |
c1734376 | 792 | win_count = entry->dccphrx_ccval; |
7c657876 ACM |
793 | step = 1; |
794 | break; | |
795 | case 1: | |
c1734376 | 796 | interval = win_count - entry->dccphrx_ccval; |
7c657876 ACM |
797 | if (interval < 0) |
798 | interval += TFRC_WIN_COUNT_LIMIT; | |
799 | if (interval > 4) | |
800 | goto found; | |
801 | break; | |
802 | } | |
803 | } | |
804 | } | |
805 | ||
59d203f9 | 806 | if (unlikely(step == 0)) { |
59348b19 GR |
807 | DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", |
808 | dccp_role(sk), sk); | |
7c657876 ACM |
809 | return ~0; |
810 | } | |
811 | ||
59d203f9 | 812 | if (unlikely(interval == 0)) { |
59348b19 GR |
813 | DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." |
814 | "Defaulting to 1\n", dccp_role(sk), sk); | |
7c657876 ACM |
815 | interval = 1; |
816 | } | |
817 | found: | |
66a377c5 | 818 | if (!tail) { |
59348b19 | 819 | DCCP_CRIT("tail is null\n"); |
66a377c5 IM |
820 | return ~0; |
821 | } | |
b6ee3d4a | 822 | rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; |
7c657876 ACM |
823 | ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", |
824 | dccp_role(sk), sk, rtt); | |
59348b19 GR |
825 | |
826 | if (rtt == 0) { | |
827 | DCCP_WARN("RTT==0, setting to 1\n"); | |
828 | rtt = 1; | |
829 | } | |
7c657876 | 830 | |
b0e56780 ACM |
831 | dccp_timestamp(sk, &tstamp); |
832 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); | |
833 | x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); | |
7c657876 | 834 | |
66a377c5 IM |
835 | if (x_recv == 0) |
836 | x_recv = hcrx->ccid3hcrx_x_recv; | |
837 | ||
7c657876 ACM |
838 | tmp1 = (u64)x_recv * (u64)rtt; |
839 | do_div(tmp1,10000000); | |
840 | tmp2 = (u32)tmp1; | |
66a377c5 IM |
841 | |
842 | if (!tmp2) { | |
59348b19 | 843 | DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv, rtt); |
66a377c5 IM |
844 | return ~0; |
845 | } | |
846 | ||
7c657876 ACM |
847 | fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; |
848 | /* do not alter order above or you will get overflow on 32 bit */ | |
36729c1a | 849 | p = tfrc_calc_x_reverse_lookup(fval); |
1f2333ae ACM |
850 | ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " |
851 | "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); | |
7c657876 ACM |
852 | |
853 | if (p == 0) | |
854 | return ~0; | |
855 | else | |
856 | return 1000000 / p; | |
857 | } | |
858 | ||
859 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) | |
860 | { | |
59725dc2 | 861 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
fc747e82 | 862 | struct dccp_li_hist_entry *head; |
66a377c5 | 863 | u64 seq_temp; |
7c657876 | 864 | |
66a377c5 IM |
865 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
866 | if (!dccp_li_hist_interval_new(ccid3_li_hist, | |
867 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) | |
868 | return; | |
7c657876 | 869 | |
fc747e82 IM |
870 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
871 | struct dccp_li_hist_entry, dccplih_node); | |
872 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); | |
66a377c5 IM |
873 | } else { |
874 | struct dccp_li_hist_entry *entry; | |
875 | struct list_head *tail; | |
876 | ||
fc747e82 IM |
877 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
878 | struct dccp_li_hist_entry, dccplih_node); | |
66a377c5 IM |
879 | /* FIXME win count check removed as was wrong */ |
880 | /* should make this check with receive history */ | |
881 | /* and compare there as per section 10.2 of RFC4342 */ | |
882 | ||
883 | /* new loss event detected */ | |
884 | /* calculate last interval length */ | |
885 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); | |
886 | entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); | |
887 | ||
888 | if (entry == NULL) { | |
59348b19 | 889 | DCCP_BUG("out of memory - can not allocate entry"); |
ae6706f0 | 890 | return; |
66a377c5 IM |
891 | } |
892 | ||
893 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); | |
894 | ||
895 | tail = hcrx->ccid3hcrx_li_hist.prev; | |
896 | list_del(tail); | |
897 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); | |
898 | ||
899 | /* Create the newest interval */ | |
900 | entry->dccplih_seqno = seq_loss; | |
901 | entry->dccplih_interval = seq_temp; | |
902 | entry->dccplih_win_count = win_loss; | |
903 | } | |
7c657876 ACM |
904 | } |
905 | ||
66a377c5 IM |
906 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
907 | struct dccp_rx_hist_entry *packet) | |
7c657876 | 908 | { |
59725dc2 | 909 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
66a377c5 IM |
910 | struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
911 | u64 seqno = packet->dccphrx_seqno; | |
912 | u64 tmp_seqno; | |
913 | int loss = 0; | |
914 | u8 ccval; | |
915 | ||
916 | ||
917 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
918 | ||
919 | if (!rx_hist || | |
920 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
921 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
922 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
923 | goto detect_out; | |
924 | } | |
925 | ||
7c657876 | 926 | |
66a377c5 IM |
927 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
928 | > TFRC_RECV_NUM_LATE_LOSS) { | |
929 | loss = 1; | |
930 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, | |
931 | hcrx->ccid3hcrx_ccval_nonloss); | |
932 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
933 | dccp_inc_seqno(&tmp_seqno); | |
934 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
935 | dccp_inc_seqno(&tmp_seqno); | |
936 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, | |
937 | tmp_seqno, &ccval)) { | |
938 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
939 | hcrx->ccid3hcrx_ccval_nonloss = ccval; | |
940 | dccp_inc_seqno(&tmp_seqno); | |
941 | } | |
942 | } | |
943 | ||
944 | /* FIXME - this code could be simplified with above while */ | |
945 | /* but works at moment */ | |
946 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
947 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
948 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
949 | } | |
950 | ||
951 | detect_out: | |
952 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, | |
953 | &hcrx->ccid3hcrx_li_hist, packet, | |
954 | hcrx->ccid3hcrx_seqno_nonloss); | |
955 | return loss; | |
7c657876 ACM |
956 | } |
957 | ||
7c657876 ACM |
958 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
959 | { | |
59725dc2 | 960 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
4fded33b | 961 | const struct dccp_options_received *opt_recv; |
8c60f3fa | 962 | struct dccp_rx_hist_entry *packet; |
7c657876 | 963 | struct timeval now; |
66a377c5 | 964 | u32 p_prev, rtt_prev, r_sample, t_elapsed; |
78ad713d | 965 | int loss, payload_size; |
1f2333ae | 966 | |
59348b19 | 967 | BUG_ON(hcrx == NULL); |
7c657876 | 968 | |
59725dc2 | 969 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
4fded33b | 970 | |
7c657876 ACM |
971 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
972 | case DCCP_PKT_ACK: | |
973 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
974 | return; | |
975 | case DCCP_PKT_DATAACK: | |
4fded33b | 976 | if (opt_recv->dccpor_timestamp_echo == 0) |
7c657876 | 977 | break; |
66a377c5 | 978 | rtt_prev = hcrx->ccid3hcrx_rtt; |
b0e56780 | 979 | dccp_timestamp(sk, &now); |
b3a3077d ACM |
980 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
981 | r_sample = timeval_usecs(&now); | |
982 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; | |
983 | ||
984 | if (unlikely(r_sample <= t_elapsed)) | |
59348b19 GR |
985 | DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", |
986 | r_sample, t_elapsed); | |
b3a3077d ACM |
987 | else |
988 | r_sample -= t_elapsed; | |
989 | ||
990 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
991 | hcrx->ccid3hcrx_rtt = r_sample; | |
992 | else | |
993 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + | |
994 | r_sample / 10; | |
995 | ||
66a377c5 IM |
996 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
997 | ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", | |
4fded33b ACM |
998 | dccp_role(sk), hcrx->ccid3hcrx_rtt, |
999 | opt_recv->dccpor_elapsed_time); | |
7c657876 ACM |
1000 | break; |
1001 | case DCCP_PKT_DATA: | |
1002 | break; | |
59d203f9 | 1003 | default: /* We're not interested in other packet types, move along */ |
7c657876 ACM |
1004 | return; |
1005 | } | |
1006 | ||
b0e56780 | 1007 | packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, |
8c60f3fa | 1008 | skb, SLAB_ATOMIC); |
59d203f9 | 1009 | if (unlikely(packet == NULL)) { |
59348b19 GR |
1010 | DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " |
1011 | "to history, consider it lost!\n", dccp_role(sk), sk); | |
7c657876 ACM |
1012 | return; |
1013 | } | |
1014 | ||
66a377c5 | 1015 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
7c657876 ACM |
1016 | |
1017 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) | |
1018 | return; | |
1019 | ||
78ad713d GR |
1020 | payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; |
1021 | ccid3_hc_rx_update_s(hcrx, payload_size); | |
1022 | ||
7c657876 ACM |
1023 | switch (hcrx->ccid3hcrx_state) { |
1024 | case TFRC_RSTATE_NO_DATA: | |
1f2333ae ACM |
1025 | ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " |
1026 | "feedback\n", | |
1027 | dccp_role(sk), sk, | |
1028 | dccp_state_name(sk->sk_state), skb); | |
7c657876 ACM |
1029 | ccid3_hc_rx_send_feedback(sk); |
1030 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); | |
1031 | return; | |
1032 | case TFRC_RSTATE_DATA: | |
78ad713d | 1033 | hcrx->ccid3hcrx_bytes_recv += payload_size; |
66a377c5 | 1034 | if (loss) |
b6ee3d4a ACM |
1035 | break; |
1036 | ||
b0e56780 | 1037 | dccp_timestamp(sk, &now); |
b6ee3d4a ACM |
1038 | if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= |
1039 | hcrx->ccid3hcrx_rtt) { | |
1040 | hcrx->ccid3hcrx_tstamp_last_ack = now; | |
1041 | ccid3_hc_rx_send_feedback(sk); | |
7c657876 | 1042 | } |
b6ee3d4a | 1043 | return; |
59348b19 GR |
1044 | case TFRC_RSTATE_TERM: |
1045 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
1046 | return; |
1047 | } | |
1048 | ||
1049 | /* Dealing with packet loss */ | |
4fded33b ACM |
1050 | ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", |
1051 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); | |
7c657876 | 1052 | |
7c657876 ACM |
1053 | p_prev = hcrx->ccid3hcrx_p; |
1054 | ||
1055 | /* Calculate loss event rate */ | |
c0996660 IM |
1056 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
1057 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); | |
1058 | ||
7c657876 | 1059 | /* Scaling up by 1000000 as fixed decimal */ |
c0996660 IM |
1060 | if (i_mean != 0) |
1061 | hcrx->ccid3hcrx_p = 1000000 / i_mean; | |
59348b19 GR |
1062 | } else |
1063 | DCCP_BUG("empty loss history"); | |
7c657876 ACM |
1064 | |
1065 | if (hcrx->ccid3hcrx_p > p_prev) { | |
1066 | ccid3_hc_rx_send_feedback(sk); | |
1067 | return; | |
1068 | } | |
1069 | } | |
1070 | ||
91f0ebf7 | 1071 | static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) |
7c657876 | 1072 | { |
91f0ebf7 | 1073 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
7c657876 ACM |
1074 | |
1075 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
1076 | ||
7c657876 ACM |
1077 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; |
1078 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); | |
ae6706f0 | 1079 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
b0e56780 | 1080 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
954ee31f | 1081 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
78ad713d | 1082 | hcrx->ccid3hcrx_s = 0; |
954ee31f | 1083 | hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ |
7c657876 ACM |
1084 | return 0; |
1085 | } | |
1086 | ||
1087 | static void ccid3_hc_rx_exit(struct sock *sk) | |
1088 | { | |
59725dc2 | 1089 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 1090 | |
59d203f9 | 1091 | BUG_ON(hcrx == NULL); |
7c657876 ACM |
1092 | |
1093 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); | |
1094 | ||
1095 | /* Empty packet history */ | |
8c60f3fa | 1096 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
7c657876 ACM |
1097 | |
1098 | /* Empty loss interval history */ | |
ae6706f0 | 1099 | dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); |
7c657876 ACM |
1100 | } |
1101 | ||
2babe1f6 ACM |
1102 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
1103 | { | |
59725dc2 | 1104 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
2babe1f6 | 1105 | |
59c2353d ACM |
1106 | /* Listen socks doesn't have a private CCID block */ |
1107 | if (sk->sk_state == DCCP_LISTEN) | |
1108 | return; | |
1109 | ||
59d203f9 | 1110 | BUG_ON(hcrx == NULL); |
2babe1f6 ACM |
1111 | |
1112 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; | |
1113 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; | |
1114 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; | |
1115 | } | |
1116 | ||
1117 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) | |
1118 | { | |
59725dc2 | 1119 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
2babe1f6 | 1120 | |
59c2353d ACM |
1121 | /* Listen socks doesn't have a private CCID block */ |
1122 | if (sk->sk_state == DCCP_LISTEN) | |
1123 | return; | |
1124 | ||
59d203f9 | 1125 | BUG_ON(hctx == NULL); |
2babe1f6 ACM |
1126 | |
1127 | info->tcpi_rto = hctx->ccid3hctx_t_rto; | |
1128 | info->tcpi_rtt = hctx->ccid3hctx_rtt; | |
1129 | } | |
1130 | ||
88f964db ACM |
1131 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
1132 | u32 __user *optval, int __user *optlen) | |
1133 | { | |
1134 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); | |
1135 | const void *val; | |
1136 | ||
1137 | /* Listen socks doesn't have a private CCID block */ | |
1138 | if (sk->sk_state == DCCP_LISTEN) | |
1139 | return -EINVAL; | |
1140 | ||
1141 | switch (optname) { | |
1142 | case DCCP_SOCKOPT_CCID_RX_INFO: | |
1143 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) | |
1144 | return -EINVAL; | |
1145 | len = sizeof(hcrx->ccid3hcrx_tfrc); | |
1146 | val = &hcrx->ccid3hcrx_tfrc; | |
1147 | break; | |
1148 | default: | |
1149 | return -ENOPROTOOPT; | |
1150 | } | |
1151 | ||
1152 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1153 | return -EFAULT; | |
1154 | ||
1155 | return 0; | |
1156 | } | |
1157 | ||
1158 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, | |
1159 | u32 __user *optval, int __user *optlen) | |
1160 | { | |
1161 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
1162 | const void *val; | |
1163 | ||
1164 | /* Listen socks doesn't have a private CCID block */ | |
1165 | if (sk->sk_state == DCCP_LISTEN) | |
1166 | return -EINVAL; | |
1167 | ||
1168 | switch (optname) { | |
1169 | case DCCP_SOCKOPT_CCID_TX_INFO: | |
1170 | if (len < sizeof(hctx->ccid3hctx_tfrc)) | |
1171 | return -EINVAL; | |
1172 | len = sizeof(hctx->ccid3hctx_tfrc); | |
1173 | val = &hctx->ccid3hctx_tfrc; | |
1174 | break; | |
1175 | default: | |
1176 | return -ENOPROTOOPT; | |
1177 | } | |
1178 | ||
1179 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1180 | return -EFAULT; | |
1181 | ||
1182 | return 0; | |
1183 | } | |
1184 | ||
91f0ebf7 | 1185 | static struct ccid_operations ccid3 = { |
3dd9a7c3 | 1186 | .ccid_id = DCCPC_CCID3, |
7c657876 ACM |
1187 | .ccid_name = "ccid3", |
1188 | .ccid_owner = THIS_MODULE, | |
91f0ebf7 | 1189 | .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), |
7c657876 ACM |
1190 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
1191 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, | |
1192 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, | |
1193 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, | |
1194 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, | |
1195 | .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, | |
1196 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, | |
91f0ebf7 | 1197 | .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), |
7c657876 ACM |
1198 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
1199 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, | |
1200 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, | |
1201 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, | |
2babe1f6 ACM |
1202 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
1203 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, | |
88f964db ACM |
1204 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
1205 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, | |
7c657876 ACM |
1206 | }; |
1207 | ||
56724aa4 | 1208 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
1209 | module_param(ccid3_debug, int, 0444); |
1210 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); | |
56724aa4 | 1211 | #endif |
7c657876 ACM |
1212 | |
1213 | static __init int ccid3_module_init(void) | |
1214 | { | |
8c60f3fa | 1215 | int rc = -ENOBUFS; |
7c657876 | 1216 | |
8c60f3fa ACM |
1217 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
1218 | if (ccid3_rx_hist == NULL) | |
7c657876 ACM |
1219 | goto out; |
1220 | ||
8c60f3fa ACM |
1221 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
1222 | if (ccid3_tx_hist == NULL) | |
1223 | goto out_free_rx; | |
7c657876 | 1224 | |
ae6706f0 ACM |
1225 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
1226 | if (ccid3_li_hist == NULL) | |
8c60f3fa | 1227 | goto out_free_tx; |
7c657876 ACM |
1228 | |
1229 | rc = ccid_register(&ccid3); | |
1230 | if (rc != 0) | |
1231 | goto out_free_loss_interval_history; | |
7c657876 ACM |
1232 | out: |
1233 | return rc; | |
8c60f3fa | 1234 | |
7c657876 | 1235 | out_free_loss_interval_history: |
ae6706f0 ACM |
1236 | dccp_li_hist_delete(ccid3_li_hist); |
1237 | ccid3_li_hist = NULL; | |
8c60f3fa ACM |
1238 | out_free_tx: |
1239 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1240 | ccid3_tx_hist = NULL; | |
1241 | out_free_rx: | |
1242 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1243 | ccid3_rx_hist = NULL; | |
7c657876 ACM |
1244 | goto out; |
1245 | } | |
1246 | module_init(ccid3_module_init); | |
1247 | ||
1248 | static __exit void ccid3_module_exit(void) | |
1249 | { | |
1250 | ccid_unregister(&ccid3); | |
1251 | ||
8c60f3fa ACM |
1252 | if (ccid3_tx_hist != NULL) { |
1253 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1254 | ccid3_tx_hist = NULL; | |
7c657876 | 1255 | } |
8c60f3fa ACM |
1256 | if (ccid3_rx_hist != NULL) { |
1257 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1258 | ccid3_rx_hist = NULL; | |
7c657876 | 1259 | } |
ae6706f0 ACM |
1260 | if (ccid3_li_hist != NULL) { |
1261 | dccp_li_hist_delete(ccid3_li_hist); | |
1262 | ccid3_li_hist = NULL; | |
7c657876 ACM |
1263 | } |
1264 | } | |
1265 | module_exit(ccid3_module_exit); | |
1266 | ||
e6bccd35 | 1267 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
1f2333ae | 1268 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
7c657876 ACM |
1269 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
1270 | MODULE_LICENSE("GPL"); | |
1271 | MODULE_ALIAS("net-dccp-ccid-3"); |