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) | |
5c3fbb6a | 124 | * X_calc = calcX(s, R, p); |
7c657876 ACM |
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; | |
5c3fbb6a GR |
130 | * |
131 | * If X has changed, we also update the scheduled send time t_now, | |
132 | * the inter-packet interval t_ipi, and the delta value. | |
7c657876 | 133 | */ |
a79ef76f GR |
134 | static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now) |
135 | ||
7c657876 | 136 | { |
59725dc2 | 137 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
17893bc1 | 138 | const __u32 old_x = hctx->ccid3hctx_x; |
7c657876 | 139 | |
44158306 | 140 | if (hctx->ccid3hctx_p > 0) { |
a79ef76f GR |
141 | hctx->ccid3hctx_x = max_t(u32, min(hctx->ccid3hctx_x_calc, |
142 | hctx->ccid3hctx_x_recv * 2), | |
143 | hctx->ccid3hctx_s / TFRC_T_MBI); | |
144 | ||
145 | } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) >= | |
146 | hctx->ccid3hctx_rtt) { | |
147 | hctx->ccid3hctx_x = max(min(hctx->ccid3hctx_x_recv, | |
148 | hctx->ccid3hctx_x ) * 2, | |
149 | usecs_div(hctx->ccid3hctx_s, | |
150 | hctx->ccid3hctx_rtt) ); | |
151 | hctx->ccid3hctx_t_ld = *now; | |
ff586298 | 152 | } |
b6ee3d4a | 153 | |
17893bc1 GR |
154 | if (hctx->ccid3hctx_x != old_x) |
155 | ccid3_update_send_time(hctx); | |
7c657876 ACM |
156 | } |
157 | ||
78ad713d GR |
158 | /* |
159 | * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) | |
160 | * @len: DCCP packet payload size in bytes | |
161 | */ | |
162 | static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) | |
163 | { | |
164 | if (unlikely(len == 0)) | |
165 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); | |
166 | else | |
167 | hctx->ccid3hctx_s = hctx->ccid3hctx_s == 0 ? len : | |
168 | (9 * hctx->ccid3hctx_s + len) / 10; | |
169 | /* | |
170 | * Note: We could do a potential optimisation here - when `s' changes, | |
171 | * recalculate sending rate and consequently t_ipi, t_delta, and | |
172 | * t_now. This is however non-standard, and the benefits are not | |
173 | * clear, so it is currently left out. | |
174 | */ | |
175 | } | |
176 | ||
7c657876 ACM |
177 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) |
178 | { | |
179 | struct sock *sk = (struct sock *)data; | |
59725dc2 | 180 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
2a1fda6f | 181 | unsigned long t_nfb = USEC_PER_SEC / 5; |
7c657876 ACM |
182 | |
183 | bh_lock_sock(sk); | |
184 | if (sock_owned_by_user(sk)) { | |
185 | /* Try again later. */ | |
186 | /* XXX: set some sensible MIB */ | |
48e03eee | 187 | goto restart_timer; |
7c657876 ACM |
188 | } |
189 | ||
190 | ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, | |
191 | ccid3_tx_state_name(hctx->ccid3hctx_state)); | |
192 | ||
7c657876 | 193 | switch (hctx->ccid3hctx_state) { |
7c657876 | 194 | case TFRC_SSTATE_NO_FBACK: |
a79ef76f | 195 | /* RFC 3448, 4.4: Halve send rate directly */ |
179ebc9f | 196 | hctx->ccid3hctx_x = max_t(u32, hctx->ccid3hctx_x / 2, |
a79ef76f | 197 | hctx->ccid3hctx_s / TFRC_T_MBI); |
7c657876 | 198 | |
1f2333ae ACM |
199 | ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " |
200 | "bytes/s\n", | |
201 | dccp_role(sk), sk, | |
202 | ccid3_tx_state_name(hctx->ccid3hctx_state), | |
7c657876 | 203 | hctx->ccid3hctx_x); |
48e03eee GR |
204 | /* The value of R is still undefined and so we can not recompute |
205 | * the timout value. Keep initial value as per [RFC 4342, 5]. */ | |
2a1fda6f | 206 | t_nfb = TFRC_INITIAL_TIMEOUT; |
17893bc1 | 207 | ccid3_update_send_time(hctx); |
7c657876 ACM |
208 | break; |
209 | case TFRC_SSTATE_FBACK: | |
1f2333ae ACM |
210 | /* |
211 | * Check if IDLE since last timeout and recv rate is less than | |
212 | * 4 packets per RTT | |
213 | */ | |
1f2333ae | 214 | if (!hctx->ccid3hctx_idle || |
6b5e633a ACM |
215 | (hctx->ccid3hctx_x_recv >= |
216 | 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { | |
a79ef76f GR |
217 | struct timeval now; |
218 | ||
1f2333ae ACM |
219 | ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", |
220 | dccp_role(sk), sk, | |
7c657876 | 221 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
7c657876 | 222 | |
ff586298 GR |
223 | /* |
224 | * Modify the cached value of X_recv [RFC 3448, 4.4] | |
225 | * | |
226 | * If (p == 0 || X_calc > 2 * X_recv) | |
7c657876 ACM |
227 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); |
228 | * Else | |
229 | * X_recv = X_calc / 4; | |
230 | */ | |
44158306 | 231 | BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); |
7c657876 | 232 | |
44158306 | 233 | if (hctx->ccid3hctx_p == 0 || |
ff586298 | 234 | hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) { |
7c657876 | 235 | hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, |
a79ef76f | 236 | hctx->ccid3hctx_s / (2 * TFRC_T_MBI)); |
ff586298 GR |
237 | if (hctx->ccid3hctx_p == 0) |
238 | dccp_timestamp(sk, &now); | |
239 | } else | |
7c657876 ACM |
240 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; |
241 | ||
ff586298 | 242 | /* Now recalculate X [RFC 3448, 4.3, step (4)] */ |
a79ef76f | 243 | ccid3_hc_tx_update_x(sk, &now); |
7c657876 | 244 | } |
6b5e633a ACM |
245 | /* |
246 | * Schedule no feedback timer to expire in | |
8a508ac2 GR |
247 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
248 | * See comments in packet_recv() regarding the value of t_RTO. | |
6b5e633a | 249 | */ |
8a508ac2 | 250 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
7c657876 | 251 | break; |
59348b19 GR |
252 | case TFRC_SSTATE_NO_SENT: |
253 | DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); | |
254 | /* fall through */ | |
255 | case TFRC_SSTATE_TERM: | |
7c657876 ACM |
256 | goto out; |
257 | } | |
258 | ||
7c657876 | 259 | hctx->ccid3hctx_idle = 1; |
48e03eee GR |
260 | |
261 | restart_timer: | |
262 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
2a1fda6f | 263 | jiffies + usecs_to_jiffies(t_nfb)); |
7c657876 ACM |
264 | out: |
265 | bh_unlock_sock(sk); | |
266 | sock_put(sk); | |
267 | } | |
268 | ||
7da7f456 GR |
269 | /* |
270 | * returns | |
271 | * > 0: delay (in msecs) that should pass before actually sending | |
272 | * = 0: can send immediately | |
273 | * < 0: error condition; do not send packet | |
274 | */ | |
6b57c93d | 275 | static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
276 | { |
277 | struct dccp_sock *dp = dccp_sk(sk); | |
59725dc2 | 278 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
8c60f3fa | 279 | struct dccp_tx_hist_entry *new_packet; |
7c657876 | 280 | struct timeval now; |
27258ee5 | 281 | long delay; |
7c657876 | 282 | |
59348b19 | 283 | BUG_ON(hctx == NULL); |
1f2333ae | 284 | |
7c657876 | 285 | /* |
da335baf GR |
286 | * This function is called only for Data and DataAck packets. Sending |
287 | * zero-sized Data(Ack)s is theoretically possible, but for congestion | |
288 | * control this case is pathological - ignore it. | |
7c657876 | 289 | */ |
6b57c93d | 290 | if (unlikely(skb->len == 0)) |
da335baf | 291 | return -EBADMSG; |
7c657876 ACM |
292 | |
293 | /* See if last packet allocated was not sent */ | |
8c60f3fa ACM |
294 | new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
295 | if (new_packet == NULL || new_packet->dccphtx_sent) { | |
1f2333ae | 296 | new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, |
54e6ecb2 | 297 | GFP_ATOMIC); |
7c657876 | 298 | |
59d203f9 | 299 | if (unlikely(new_packet == NULL)) { |
59348b19 GR |
300 | DCCP_WARN("%s, sk=%p, not enough mem to add to history," |
301 | "send refused\n", dccp_role(sk), sk); | |
7da7f456 | 302 | return -ENOBUFS; |
7c657876 ACM |
303 | } |
304 | ||
8c60f3fa | 305 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); |
7c657876 ACM |
306 | } |
307 | ||
b0e56780 | 308 | dccp_timestamp(sk, &now); |
7c657876 ACM |
309 | |
310 | switch (hctx->ccid3hctx_state) { | |
311 | case TFRC_SSTATE_NO_SENT: | |
1f2333ae ACM |
312 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
313 | jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); | |
7c657876 ACM |
314 | hctx->ccid3hctx_last_win_count = 0; |
315 | hctx->ccid3hctx_t_last_win_count = now; | |
316 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); | |
7c657876 | 317 | |
78ad713d | 318 | /* Set initial sending rate to 1 packet per second */ |
6b57c93d | 319 | ccid3_hc_tx_update_s(hctx, skb->len); |
78ad713d GR |
320 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; |
321 | ||
90feeb95 GR |
322 | /* First timeout, according to [RFC 3448, 4.2], is 1 second */ |
323 | hctx->ccid3hctx_t_ipi = USEC_PER_SEC; | |
324 | /* Initial delta: minimum of 0.5 sec and t_gran/2 */ | |
325 | hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; | |
326 | ||
327 | /* Set t_0 for initial packet */ | |
7c657876 | 328 | hctx->ccid3hctx_t_nom = now; |
7c657876 ACM |
329 | break; |
330 | case TFRC_SSTATE_NO_FBACK: | |
331 | case TFRC_SSTATE_FBACK: | |
91cf5a17 GR |
332 | delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); |
333 | /* | |
334 | * Scheduling of packet transmissions [RFC 3448, 4.6] | |
335 | * | |
336 | * if (t_now > t_nom - delta) | |
337 | * // send the packet now | |
338 | * else | |
339 | * // send the packet in (t_nom - t_now) milliseconds. | |
340 | */ | |
76d12777 | 341 | if (delay - (long)hctx->ccid3hctx_delta >= 0) |
7da7f456 | 342 | return delay / 1000L; |
7c657876 | 343 | break; |
59348b19 GR |
344 | case TFRC_SSTATE_TERM: |
345 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7da7f456 | 346 | return -EINVAL; |
7c657876 ACM |
347 | } |
348 | ||
7da7f456 GR |
349 | /* prepare to send now (add options etc.) */ |
350 | dp->dccps_hc_tx_insert_options = 1; | |
351 | new_packet->dccphtx_ccval = DCCP_SKB_CB(skb)->dccpd_ccval = | |
352 | hctx->ccid3hctx_last_win_count; | |
353 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); | |
354 | ||
355 | return 0; | |
7c657876 ACM |
356 | } |
357 | ||
6b57c93d | 358 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len) |
7c657876 | 359 | { |
59725dc2 ACM |
360 | const struct dccp_sock *dp = dccp_sk(sk); |
361 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 | 362 | struct timeval now; |
6b57c93d GR |
363 | unsigned long quarter_rtt; |
364 | struct dccp_tx_hist_entry *packet; | |
7c657876 | 365 | |
59348b19 | 366 | BUG_ON(hctx == NULL); |
7c657876 | 367 | |
b0e56780 | 368 | dccp_timestamp(sk, &now); |
7c657876 | 369 | |
6b57c93d | 370 | ccid3_hc_tx_update_s(hctx, len); |
7c657876 | 371 | |
6b57c93d GR |
372 | packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
373 | if (unlikely(packet == NULL)) { | |
374 | DCCP_WARN("packet doesn't exist in history!\n"); | |
375 | return; | |
376 | } | |
377 | if (unlikely(packet->dccphtx_sent)) { | |
378 | DCCP_WARN("no unsent packet in history!\n"); | |
379 | return; | |
380 | } | |
381 | packet->dccphtx_tstamp = now; | |
382 | packet->dccphtx_seqno = dp->dccps_gss; | |
383 | /* | |
384 | * Check if win_count have changed | |
385 | * Algorithm in "8.1. Window Counter Value" in RFC 4342. | |
386 | */ | |
387 | quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); | |
388 | if (likely(hctx->ccid3hctx_rtt > 8)) | |
389 | quarter_rtt /= hctx->ccid3hctx_rtt / 4; | |
78ad713d | 390 | |
6b57c93d GR |
391 | if (quarter_rtt > 0) { |
392 | hctx->ccid3hctx_t_last_win_count = now; | |
393 | hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + | |
394 | min_t(unsigned long, quarter_rtt, 5)) % 16; | |
395 | ccid3_pr_debug("%s, sk=%p, window changed from " | |
396 | "%u to %u!\n", | |
397 | dccp_role(sk), sk, | |
398 | packet->dccphtx_ccval, | |
399 | hctx->ccid3hctx_last_win_count); | |
400 | } | |
1f2333ae | 401 | |
6b57c93d GR |
402 | hctx->ccid3hctx_idle = 0; |
403 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; | |
404 | packet->dccphtx_sent = 1; | |
7c657876 ACM |
405 | } |
406 | ||
407 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) | |
408 | { | |
59725dc2 ACM |
409 | const struct dccp_sock *dp = dccp_sk(sk); |
410 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 | 411 | struct ccid3_options_received *opt_recv; |
8c60f3fa | 412 | struct dccp_tx_hist_entry *packet; |
b0e56780 | 413 | struct timeval now; |
2a1fda6f | 414 | unsigned long t_nfb; |
7c657876 | 415 | u32 pinv; |
5c3fbb6a | 416 | long r_sample, t_elapsed; |
1f2333ae | 417 | |
59348b19 | 418 | BUG_ON(hctx == NULL); |
7c657876 ACM |
419 | |
420 | /* we are only interested in ACKs */ | |
421 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || | |
422 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) | |
423 | return; | |
424 | ||
425 | opt_recv = &hctx->ccid3hctx_options_received; | |
426 | ||
7c657876 | 427 | switch (hctx->ccid3hctx_state) { |
7c657876 ACM |
428 | case TFRC_SSTATE_NO_FBACK: |
429 | case TFRC_SSTATE_FBACK: | |
5c3fbb6a | 430 | /* get packet from history to look up t_recvdata */ |
8c60f3fa ACM |
431 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
432 | DCCP_SKB_CB(skb)->dccpd_ack_seq); | |
59d203f9 | 433 | if (unlikely(packet == NULL)) { |
5c3fbb6a | 434 | DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " |
59348b19 | 435 | "in history!\n", dccp_role(sk), sk, |
59d203f9 | 436 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
59348b19 | 437 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
7c657876 ACM |
438 | return; |
439 | } | |
440 | ||
5c3fbb6a GR |
441 | /* Update receive rate */ |
442 | hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; | |
443 | ||
444 | /* Update loss event rate */ | |
445 | pinv = opt_recv->ccid3or_loss_event_rate; | |
45393a66 | 446 | if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ |
5c3fbb6a | 447 | hctx->ccid3hctx_p = 0; |
45393a66 | 448 | else /* can not exceed 100% */ |
44158306 | 449 | hctx->ccid3hctx_p = 1000000 / pinv; |
5c3fbb6a | 450 | |
b0e56780 | 451 | dccp_timestamp(sk, &now); |
5c3fbb6a GR |
452 | |
453 | /* | |
454 | * Calculate new round trip sample as per [RFC 3448, 4.3] by | |
455 | * R_sample = (now - t_recvdata) - t_elapsed | |
456 | */ | |
457 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); | |
458 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; | |
459 | ||
460 | if (unlikely(r_sample <= 0)) { | |
461 | DCCP_WARN("WARNING: R_sample (%ld) <= 0!\n", r_sample); | |
462 | r_sample = 0; | |
463 | } else if (unlikely(r_sample <= t_elapsed)) | |
464 | DCCP_WARN("WARNING: r_sample=%ldus <= t_elapsed=%ldus\n", | |
59348b19 | 465 | r_sample, t_elapsed); |
1a28599a ACM |
466 | else |
467 | r_sample -= t_elapsed; | |
7c657876 ACM |
468 | |
469 | /* Update RTT estimate by | |
470 | * If (No feedback recv) | |
471 | * R = R_sample; | |
472 | * Else | |
473 | * R = q * R + (1 - q) * R_sample; | |
474 | * | |
475 | * q is a constant, RFC 3448 recomments 0.9 | |
476 | */ | |
477 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { | |
a79ef76f GR |
478 | /* Use Larger Initial Windows [RFC 4342, sec. 5] |
479 | * We deviate in that we use `s' instead of `MSS'. */ | |
179ebc9f | 480 | u16 w_init = min( 4 * hctx->ccid3hctx_s, |
a79ef76f GR |
481 | max(2 * hctx->ccid3hctx_s, 4380)); |
482 | hctx->ccid3hctx_rtt = r_sample; | |
483 | hctx->ccid3hctx_x = usecs_div(w_init, r_sample); | |
484 | hctx->ccid3hctx_t_ld = now; | |
485 | ||
486 | ccid3_update_send_time(hctx); | |
7c657876 | 487 | |
5c3fbb6a GR |
488 | ccid3_pr_debug("%s(%p), s=%u, w_init=%u, " |
489 | "R_sample=%ldus, X=%u\n", dccp_role(sk), | |
490 | sk, hctx->ccid3hctx_s, w_init, r_sample, | |
491 | hctx->ccid3hctx_x); | |
7c657876 | 492 | |
5c3fbb6a GR |
493 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); |
494 | } else { | |
495 | hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + | |
496 | (u32)r_sample ) / 10; | |
7c657876 | 497 | |
ff586298 GR |
498 | /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ |
499 | if (hctx->ccid3hctx_p > 0) | |
500 | hctx->ccid3hctx_x_calc = | |
501 | tfrc_calc_x(hctx->ccid3hctx_s, | |
502 | hctx->ccid3hctx_rtt, | |
503 | hctx->ccid3hctx_p); | |
5c3fbb6a | 504 | ccid3_hc_tx_update_x(sk, &now); |
7c657876 | 505 | |
5c3fbb6a GR |
506 | ccid3_pr_debug("%s(%p), RTT=%uus (sample=%ldus), s=%u, " |
507 | "p=%u, X_calc=%u, X=%u\n", dccp_role(sk), | |
508 | sk, hctx->ccid3hctx_rtt, r_sample, | |
509 | hctx->ccid3hctx_s, hctx->ccid3hctx_p, | |
510 | hctx->ccid3hctx_x_calc, | |
511 | hctx->ccid3hctx_x); | |
7c657876 ACM |
512 | } |
513 | ||
514 | /* unschedule no feedback timer */ | |
515 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
516 | ||
7c657876 | 517 | /* remove all packets older than the one acked from history */ |
8c60f3fa ACM |
518 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
519 | &hctx->ccid3hctx_hist, packet); | |
c530cfb1 ACM |
520 | /* |
521 | * As we have calculated new ipi, delta, t_nom it is possible that | |
5d0dbc4a | 522 | * we now can send a packet, so wake up dccp_wait_for_ccid |
c530cfb1 ACM |
523 | */ |
524 | sk->sk_write_space(sk); | |
8c60f3fa | 525 | |
8a508ac2 GR |
526 | /* |
527 | * Update timeout interval for the nofeedback timer. | |
528 | * We use a configuration option to increase the lower bound. | |
529 | * This can help avoid triggering the nofeedback timer too often | |
530 | * ('spinning') on LANs with small RTTs. | |
531 | */ | |
5d0dbc4a | 532 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
8a508ac2 GR |
533 | CONFIG_IP_DCCP_CCID3_RTO * |
534 | (USEC_PER_SEC/1000) ); | |
1f2333ae ACM |
535 | /* |
536 | * Schedule no feedback timer to expire in | |
8a508ac2 | 537 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
1f2333ae | 538 | */ |
8a508ac2 | 539 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
6b5e633a | 540 | |
1f2333ae ACM |
541 | ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " |
542 | "expire in %lu jiffies (%luus)\n", | |
543 | dccp_role(sk), sk, | |
2a1fda6f | 544 | usecs_to_jiffies(t_nfb), t_nfb); |
7c657876 ACM |
545 | |
546 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
2a1fda6f | 547 | jiffies + usecs_to_jiffies(t_nfb)); |
7c657876 ACM |
548 | |
549 | /* set idle flag */ | |
550 | hctx->ccid3hctx_idle = 1; | |
551 | break; | |
5e19e3fc | 552 | case TFRC_SSTATE_NO_SENT: |
26af3072 GR |
553 | if (dccp_sk(sk)->dccps_role == DCCP_ROLE_CLIENT) |
554 | DCCP_WARN("Illegal ACK received - no packet sent\n"); | |
5e19e3fc GR |
555 | /* fall through */ |
556 | case TFRC_SSTATE_TERM: /* ignore feedback when closing */ | |
7c657876 ACM |
557 | break; |
558 | } | |
559 | } | |
560 | ||
2d0817d1 | 561 | static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 562 | { |
59d203f9 | 563 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 564 | |
59d203f9 ACM |
565 | BUG_ON(hctx == NULL); |
566 | ||
2d0817d1 ACM |
567 | if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) |
568 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; | |
569 | return 0; | |
7c657876 ACM |
570 | } |
571 | ||
572 | static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, | |
1f2333ae ACM |
573 | unsigned char len, u16 idx, |
574 | unsigned char *value) | |
7c657876 ACM |
575 | { |
576 | int rc = 0; | |
59725dc2 ACM |
577 | const struct dccp_sock *dp = dccp_sk(sk); |
578 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 ACM |
579 | struct ccid3_options_received *opt_recv; |
580 | ||
59d203f9 | 581 | BUG_ON(hctx == NULL); |
7c657876 ACM |
582 | |
583 | opt_recv = &hctx->ccid3hctx_options_received; | |
584 | ||
585 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { | |
586 | opt_recv->ccid3or_seqno = dp->dccps_gsr; | |
587 | opt_recv->ccid3or_loss_event_rate = ~0; | |
588 | opt_recv->ccid3or_loss_intervals_idx = 0; | |
589 | opt_recv->ccid3or_loss_intervals_len = 0; | |
590 | opt_recv->ccid3or_receive_rate = 0; | |
591 | } | |
592 | ||
593 | switch (option) { | |
594 | case TFRC_OPT_LOSS_EVENT_RATE: | |
59d203f9 | 595 | if (unlikely(len != 4)) { |
59348b19 GR |
596 | DCCP_WARN("%s, sk=%p, invalid len %d " |
597 | "for TFRC_OPT_LOSS_EVENT_RATE\n", | |
598 | dccp_role(sk), sk, len); | |
7c657876 ACM |
599 | rc = -EINVAL; |
600 | } else { | |
60fe62e7 | 601 | opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
602 | ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", |
603 | dccp_role(sk), sk, | |
604 | opt_recv->ccid3or_loss_event_rate); | |
605 | } | |
606 | break; | |
607 | case TFRC_OPT_LOSS_INTERVALS: | |
608 | opt_recv->ccid3or_loss_intervals_idx = idx; | |
609 | opt_recv->ccid3or_loss_intervals_len = len; | |
610 | ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", | |
611 | dccp_role(sk), sk, | |
612 | opt_recv->ccid3or_loss_intervals_idx, | |
613 | opt_recv->ccid3or_loss_intervals_len); | |
614 | break; | |
615 | case TFRC_OPT_RECEIVE_RATE: | |
59d203f9 | 616 | if (unlikely(len != 4)) { |
59348b19 GR |
617 | DCCP_WARN("%s, sk=%p, invalid len %d " |
618 | "for TFRC_OPT_RECEIVE_RATE\n", | |
619 | dccp_role(sk), sk, len); | |
7c657876 ACM |
620 | rc = -EINVAL; |
621 | } else { | |
60fe62e7 | 622 | opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
623 | ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", |
624 | dccp_role(sk), sk, | |
625 | opt_recv->ccid3or_receive_rate); | |
626 | } | |
627 | break; | |
628 | } | |
629 | ||
630 | return rc; | |
631 | } | |
632 | ||
91f0ebf7 | 633 | static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) |
7c657876 | 634 | { |
91f0ebf7 | 635 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
7c657876 | 636 | |
78ad713d | 637 | hctx->ccid3hctx_s = 0; |
7c657876 ACM |
638 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
639 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); | |
aa5d7df3 ACM |
640 | |
641 | hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; | |
642 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; | |
7c657876 ACM |
643 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
648 | static void ccid3_hc_tx_exit(struct sock *sk) | |
649 | { | |
59725dc2 | 650 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 651 | |
7c657876 ACM |
652 | BUG_ON(hctx == NULL); |
653 | ||
654 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); | |
655 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
656 | ||
657 | /* Empty packet history */ | |
8c60f3fa | 658 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
7c657876 ACM |
659 | } |
660 | ||
661 | /* | |
662 | * RX Half Connection methods | |
663 | */ | |
664 | ||
56724aa4 | 665 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
666 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
667 | { | |
668 | static char *ccid3_rx_state_names[] = { | |
669 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", | |
670 | [TFRC_RSTATE_DATA] = "DATA", | |
671 | [TFRC_RSTATE_TERM] = "TERM", | |
672 | }; | |
673 | ||
674 | return ccid3_rx_state_names[state]; | |
675 | } | |
676 | #endif | |
677 | ||
c25a18ba ACM |
678 | static void ccid3_hc_rx_set_state(struct sock *sk, |
679 | enum ccid3_hc_rx_states state) | |
7c657876 | 680 | { |
59725dc2 | 681 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 ACM |
682 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
683 | ||
684 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
685 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
686 | ccid3_rx_state_name(state)); | |
7c657876 ACM |
687 | WARN_ON(state == oldstate); |
688 | hcrx->ccid3hcrx_state = state; | |
689 | } | |
690 | ||
78ad713d GR |
691 | static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) |
692 | { | |
693 | if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ | |
694 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); | |
695 | else | |
696 | hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : | |
697 | (9 * hcrx->ccid3hcrx_s + len) / 10; | |
698 | } | |
699 | ||
7c657876 ACM |
700 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
701 | { | |
59725dc2 | 702 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 703 | struct dccp_sock *dp = dccp_sk(sk); |
8c60f3fa | 704 | struct dccp_rx_hist_entry *packet; |
b6ee3d4a | 705 | struct timeval now; |
7c657876 ACM |
706 | |
707 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
708 | ||
b0e56780 | 709 | dccp_timestamp(sk, &now); |
b6ee3d4a | 710 | |
7c657876 ACM |
711 | switch (hcrx->ccid3hcrx_state) { |
712 | case TFRC_RSTATE_NO_DATA: | |
713 | hcrx->ccid3hcrx_x_recv = 0; | |
714 | break; | |
715 | case TFRC_RSTATE_DATA: { | |
b6ee3d4a ACM |
716 | const u32 delta = timeval_delta(&now, |
717 | &hcrx->ccid3hcrx_tstamp_last_feedback); | |
27ae543e ACM |
718 | hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, |
719 | delta); | |
7c657876 ACM |
720 | } |
721 | break; | |
59348b19 GR |
722 | case TFRC_RSTATE_TERM: |
723 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
724 | return; |
725 | } | |
726 | ||
8c60f3fa | 727 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
59d203f9 | 728 | if (unlikely(packet == NULL)) { |
59348b19 GR |
729 | DCCP_WARN("%s, sk=%p, no data packet in history!\n", |
730 | dccp_role(sk), sk); | |
7c657876 ACM |
731 | return; |
732 | } | |
733 | ||
b6ee3d4a | 734 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
66a377c5 | 735 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
7c657876 ACM |
736 | hcrx->ccid3hcrx_bytes_recv = 0; |
737 | ||
738 | /* Convert to multiples of 10us */ | |
b6ee3d4a ACM |
739 | hcrx->ccid3hcrx_elapsed_time = |
740 | timeval_delta(&now, &packet->dccphrx_tstamp) / 10; | |
45393a66 | 741 | |
7c657876 | 742 | if (hcrx->ccid3hcrx_p == 0) |
45393a66 GR |
743 | hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ |
744 | else if (hcrx->ccid3hcrx_p > 1000000) { | |
745 | DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); | |
746 | hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ | |
747 | } else | |
7c657876 | 748 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; |
45393a66 | 749 | |
507d37cf | 750 | dp->dccps_hc_rx_insert_options = 1; |
7c657876 ACM |
751 | dccp_send_ack(sk); |
752 | } | |
753 | ||
2d0817d1 | 754 | static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 755 | { |
59d203f9 | 756 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
60fe62e7 | 757 | __be32 x_recv, pinv; |
7c657876 | 758 | |
59d203f9 ACM |
759 | BUG_ON(hcrx == NULL); |
760 | ||
761 | if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) | |
2d0817d1 | 762 | return 0; |
7c657876 | 763 | |
66a377c5 | 764 | DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; |
4fded33b ACM |
765 | |
766 | if (dccp_packet_without_ack(skb)) | |
2d0817d1 ACM |
767 | return 0; |
768 | ||
4fded33b ACM |
769 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
770 | pinv = htonl(hcrx->ccid3hcrx_pinv); | |
2d0817d1 ACM |
771 | |
772 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && | |
773 | dccp_insert_option_elapsed_time(sk, skb, | |
774 | hcrx->ccid3hcrx_elapsed_time)) || | |
775 | dccp_insert_option_timestamp(sk, skb) || | |
776 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, | |
777 | &pinv, sizeof(pinv)) || | |
778 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, | |
779 | &x_recv, sizeof(x_recv))) | |
780 | return -1; | |
781 | ||
782 | return 0; | |
7c657876 ACM |
783 | } |
784 | ||
7c657876 ACM |
785 | /* calculate first loss interval |
786 | * | |
787 | * returns estimated loss interval in usecs */ | |
788 | ||
789 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) | |
790 | { | |
59725dc2 | 791 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
8c60f3fa | 792 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
7c657876 | 793 | u32 rtt, delta, x_recv, fval, p, tmp2; |
b6ee3d4a | 794 | struct timeval tstamp = { 0, }; |
7c657876 ACM |
795 | int interval = 0; |
796 | int win_count = 0; | |
797 | int step = 0; | |
798 | u64 tmp1; | |
799 | ||
8c60f3fa ACM |
800 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
801 | dccphrx_node) { | |
802 | if (dccp_rx_hist_entry_data_packet(entry)) { | |
7c657876 ACM |
803 | tail = entry; |
804 | ||
805 | switch (step) { | |
806 | case 0: | |
8c60f3fa | 807 | tstamp = entry->dccphrx_tstamp; |
c1734376 | 808 | win_count = entry->dccphrx_ccval; |
7c657876 ACM |
809 | step = 1; |
810 | break; | |
811 | case 1: | |
c1734376 | 812 | interval = win_count - entry->dccphrx_ccval; |
7c657876 ACM |
813 | if (interval < 0) |
814 | interval += TFRC_WIN_COUNT_LIMIT; | |
815 | if (interval > 4) | |
816 | goto found; | |
817 | break; | |
818 | } | |
819 | } | |
820 | } | |
821 | ||
59d203f9 | 822 | if (unlikely(step == 0)) { |
59348b19 GR |
823 | DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", |
824 | dccp_role(sk), sk); | |
7c657876 ACM |
825 | return ~0; |
826 | } | |
827 | ||
59d203f9 | 828 | if (unlikely(interval == 0)) { |
59348b19 GR |
829 | DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." |
830 | "Defaulting to 1\n", dccp_role(sk), sk); | |
7c657876 ACM |
831 | interval = 1; |
832 | } | |
833 | found: | |
66a377c5 | 834 | if (!tail) { |
59348b19 | 835 | DCCP_CRIT("tail is null\n"); |
66a377c5 IM |
836 | return ~0; |
837 | } | |
b6ee3d4a | 838 | rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; |
7c657876 ACM |
839 | ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", |
840 | dccp_role(sk), sk, rtt); | |
59348b19 GR |
841 | |
842 | if (rtt == 0) { | |
843 | DCCP_WARN("RTT==0, setting to 1\n"); | |
844 | rtt = 1; | |
845 | } | |
7c657876 | 846 | |
b0e56780 ACM |
847 | dccp_timestamp(sk, &tstamp); |
848 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); | |
849 | x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); | |
7c657876 | 850 | |
66a377c5 IM |
851 | if (x_recv == 0) |
852 | x_recv = hcrx->ccid3hcrx_x_recv; | |
853 | ||
7c657876 ACM |
854 | tmp1 = (u64)x_recv * (u64)rtt; |
855 | do_div(tmp1,10000000); | |
856 | tmp2 = (u32)tmp1; | |
66a377c5 IM |
857 | |
858 | if (!tmp2) { | |
59348b19 | 859 | DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv, rtt); |
66a377c5 IM |
860 | return ~0; |
861 | } | |
862 | ||
7c657876 ACM |
863 | fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; |
864 | /* do not alter order above or you will get overflow on 32 bit */ | |
36729c1a | 865 | p = tfrc_calc_x_reverse_lookup(fval); |
1f2333ae ACM |
866 | ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " |
867 | "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); | |
7c657876 ACM |
868 | |
869 | if (p == 0) | |
870 | return ~0; | |
871 | else | |
872 | return 1000000 / p; | |
873 | } | |
874 | ||
875 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) | |
876 | { | |
59725dc2 | 877 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
fc747e82 | 878 | struct dccp_li_hist_entry *head; |
66a377c5 | 879 | u64 seq_temp; |
7c657876 | 880 | |
66a377c5 IM |
881 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
882 | if (!dccp_li_hist_interval_new(ccid3_li_hist, | |
883 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) | |
884 | return; | |
7c657876 | 885 | |
fc747e82 IM |
886 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
887 | struct dccp_li_hist_entry, dccplih_node); | |
888 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); | |
66a377c5 IM |
889 | } else { |
890 | struct dccp_li_hist_entry *entry; | |
891 | struct list_head *tail; | |
892 | ||
fc747e82 IM |
893 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
894 | struct dccp_li_hist_entry, dccplih_node); | |
66a377c5 IM |
895 | /* FIXME win count check removed as was wrong */ |
896 | /* should make this check with receive history */ | |
897 | /* and compare there as per section 10.2 of RFC4342 */ | |
898 | ||
899 | /* new loss event detected */ | |
900 | /* calculate last interval length */ | |
901 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); | |
54e6ecb2 | 902 | entry = dccp_li_hist_entry_new(ccid3_li_hist, GFP_ATOMIC); |
66a377c5 IM |
903 | |
904 | if (entry == NULL) { | |
59348b19 | 905 | DCCP_BUG("out of memory - can not allocate entry"); |
ae6706f0 | 906 | return; |
66a377c5 IM |
907 | } |
908 | ||
909 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); | |
910 | ||
911 | tail = hcrx->ccid3hcrx_li_hist.prev; | |
912 | list_del(tail); | |
913 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); | |
914 | ||
915 | /* Create the newest interval */ | |
916 | entry->dccplih_seqno = seq_loss; | |
917 | entry->dccplih_interval = seq_temp; | |
918 | entry->dccplih_win_count = win_loss; | |
919 | } | |
7c657876 ACM |
920 | } |
921 | ||
66a377c5 IM |
922 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
923 | struct dccp_rx_hist_entry *packet) | |
7c657876 | 924 | { |
59725dc2 | 925 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
66a377c5 IM |
926 | struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
927 | u64 seqno = packet->dccphrx_seqno; | |
928 | u64 tmp_seqno; | |
929 | int loss = 0; | |
930 | u8 ccval; | |
931 | ||
932 | ||
933 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
934 | ||
935 | if (!rx_hist || | |
936 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
937 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
938 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
939 | goto detect_out; | |
940 | } | |
941 | ||
7c657876 | 942 | |
66a377c5 IM |
943 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
944 | > TFRC_RECV_NUM_LATE_LOSS) { | |
945 | loss = 1; | |
946 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, | |
947 | hcrx->ccid3hcrx_ccval_nonloss); | |
948 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
949 | dccp_inc_seqno(&tmp_seqno); | |
950 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
951 | dccp_inc_seqno(&tmp_seqno); | |
952 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, | |
953 | tmp_seqno, &ccval)) { | |
954 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
955 | hcrx->ccid3hcrx_ccval_nonloss = ccval; | |
956 | dccp_inc_seqno(&tmp_seqno); | |
957 | } | |
958 | } | |
959 | ||
960 | /* FIXME - this code could be simplified with above while */ | |
961 | /* but works at moment */ | |
962 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
963 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
964 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
965 | } | |
966 | ||
967 | detect_out: | |
968 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, | |
969 | &hcrx->ccid3hcrx_li_hist, packet, | |
970 | hcrx->ccid3hcrx_seqno_nonloss); | |
971 | return loss; | |
7c657876 ACM |
972 | } |
973 | ||
7c657876 ACM |
974 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
975 | { | |
59725dc2 | 976 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
4fded33b | 977 | const struct dccp_options_received *opt_recv; |
8c60f3fa | 978 | struct dccp_rx_hist_entry *packet; |
7c657876 | 979 | struct timeval now; |
66a377c5 | 980 | u32 p_prev, rtt_prev, r_sample, t_elapsed; |
78ad713d | 981 | int loss, payload_size; |
1f2333ae | 982 | |
59348b19 | 983 | BUG_ON(hcrx == NULL); |
7c657876 | 984 | |
59725dc2 | 985 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
4fded33b | 986 | |
7c657876 ACM |
987 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
988 | case DCCP_PKT_ACK: | |
989 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
990 | return; | |
991 | case DCCP_PKT_DATAACK: | |
4fded33b | 992 | if (opt_recv->dccpor_timestamp_echo == 0) |
7c657876 | 993 | break; |
66a377c5 | 994 | rtt_prev = hcrx->ccid3hcrx_rtt; |
b0e56780 | 995 | dccp_timestamp(sk, &now); |
b3a3077d ACM |
996 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
997 | r_sample = timeval_usecs(&now); | |
998 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; | |
999 | ||
1000 | if (unlikely(r_sample <= t_elapsed)) | |
59348b19 GR |
1001 | DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", |
1002 | r_sample, t_elapsed); | |
b3a3077d ACM |
1003 | else |
1004 | r_sample -= t_elapsed; | |
1005 | ||
1006 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
1007 | hcrx->ccid3hcrx_rtt = r_sample; | |
1008 | else | |
1009 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + | |
1010 | r_sample / 10; | |
1011 | ||
66a377c5 IM |
1012 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
1013 | ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", | |
4fded33b ACM |
1014 | dccp_role(sk), hcrx->ccid3hcrx_rtt, |
1015 | opt_recv->dccpor_elapsed_time); | |
7c657876 ACM |
1016 | break; |
1017 | case DCCP_PKT_DATA: | |
1018 | break; | |
59d203f9 | 1019 | default: /* We're not interested in other packet types, move along */ |
7c657876 ACM |
1020 | return; |
1021 | } | |
1022 | ||
b0e56780 | 1023 | packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, |
54e6ecb2 | 1024 | skb, GFP_ATOMIC); |
59d203f9 | 1025 | if (unlikely(packet == NULL)) { |
59348b19 GR |
1026 | DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " |
1027 | "to history, consider it lost!\n", dccp_role(sk), sk); | |
7c657876 ACM |
1028 | return; |
1029 | } | |
1030 | ||
66a377c5 | 1031 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
7c657876 ACM |
1032 | |
1033 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) | |
1034 | return; | |
1035 | ||
78ad713d GR |
1036 | payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; |
1037 | ccid3_hc_rx_update_s(hcrx, payload_size); | |
1038 | ||
7c657876 ACM |
1039 | switch (hcrx->ccid3hcrx_state) { |
1040 | case TFRC_RSTATE_NO_DATA: | |
1f2333ae ACM |
1041 | ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " |
1042 | "feedback\n", | |
1043 | dccp_role(sk), sk, | |
1044 | dccp_state_name(sk->sk_state), skb); | |
7c657876 ACM |
1045 | ccid3_hc_rx_send_feedback(sk); |
1046 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); | |
1047 | return; | |
1048 | case TFRC_RSTATE_DATA: | |
78ad713d | 1049 | hcrx->ccid3hcrx_bytes_recv += payload_size; |
66a377c5 | 1050 | if (loss) |
b6ee3d4a ACM |
1051 | break; |
1052 | ||
b0e56780 | 1053 | dccp_timestamp(sk, &now); |
b6ee3d4a ACM |
1054 | if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= |
1055 | hcrx->ccid3hcrx_rtt) { | |
1056 | hcrx->ccid3hcrx_tstamp_last_ack = now; | |
1057 | ccid3_hc_rx_send_feedback(sk); | |
7c657876 | 1058 | } |
b6ee3d4a | 1059 | return; |
59348b19 GR |
1060 | case TFRC_RSTATE_TERM: |
1061 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
1062 | return; |
1063 | } | |
1064 | ||
1065 | /* Dealing with packet loss */ | |
4fded33b ACM |
1066 | ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", |
1067 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); | |
7c657876 | 1068 | |
7c657876 ACM |
1069 | p_prev = hcrx->ccid3hcrx_p; |
1070 | ||
1071 | /* Calculate loss event rate */ | |
c0996660 IM |
1072 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
1073 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); | |
1074 | ||
7c657876 | 1075 | /* Scaling up by 1000000 as fixed decimal */ |
c0996660 IM |
1076 | if (i_mean != 0) |
1077 | hcrx->ccid3hcrx_p = 1000000 / i_mean; | |
59348b19 GR |
1078 | } else |
1079 | DCCP_BUG("empty loss history"); | |
7c657876 ACM |
1080 | |
1081 | if (hcrx->ccid3hcrx_p > p_prev) { | |
1082 | ccid3_hc_rx_send_feedback(sk); | |
1083 | return; | |
1084 | } | |
1085 | } | |
1086 | ||
91f0ebf7 | 1087 | static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) |
7c657876 | 1088 | { |
91f0ebf7 | 1089 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
7c657876 ACM |
1090 | |
1091 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
1092 | ||
7c657876 ACM |
1093 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; |
1094 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); | |
ae6706f0 | 1095 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
b0e56780 | 1096 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
954ee31f | 1097 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
78ad713d | 1098 | hcrx->ccid3hcrx_s = 0; |
954ee31f | 1099 | hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ |
7c657876 ACM |
1100 | return 0; |
1101 | } | |
1102 | ||
1103 | static void ccid3_hc_rx_exit(struct sock *sk) | |
1104 | { | |
59725dc2 | 1105 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 1106 | |
59d203f9 | 1107 | BUG_ON(hcrx == NULL); |
7c657876 ACM |
1108 | |
1109 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); | |
1110 | ||
1111 | /* Empty packet history */ | |
8c60f3fa | 1112 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
7c657876 ACM |
1113 | |
1114 | /* Empty loss interval history */ | |
ae6706f0 | 1115 | dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); |
7c657876 ACM |
1116 | } |
1117 | ||
2babe1f6 ACM |
1118 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
1119 | { | |
59725dc2 | 1120 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
2babe1f6 | 1121 | |
59c2353d ACM |
1122 | /* Listen socks doesn't have a private CCID block */ |
1123 | if (sk->sk_state == DCCP_LISTEN) | |
1124 | return; | |
1125 | ||
59d203f9 | 1126 | BUG_ON(hcrx == NULL); |
2babe1f6 ACM |
1127 | |
1128 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; | |
1129 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; | |
1130 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; | |
1131 | } | |
1132 | ||
1133 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) | |
1134 | { | |
59725dc2 | 1135 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
2babe1f6 | 1136 | |
59c2353d ACM |
1137 | /* Listen socks doesn't have a private CCID block */ |
1138 | if (sk->sk_state == DCCP_LISTEN) | |
1139 | return; | |
1140 | ||
59d203f9 | 1141 | BUG_ON(hctx == NULL); |
2babe1f6 ACM |
1142 | |
1143 | info->tcpi_rto = hctx->ccid3hctx_t_rto; | |
1144 | info->tcpi_rtt = hctx->ccid3hctx_rtt; | |
1145 | } | |
1146 | ||
88f964db ACM |
1147 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
1148 | u32 __user *optval, int __user *optlen) | |
1149 | { | |
1150 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); | |
1151 | const void *val; | |
1152 | ||
1153 | /* Listen socks doesn't have a private CCID block */ | |
1154 | if (sk->sk_state == DCCP_LISTEN) | |
1155 | return -EINVAL; | |
1156 | ||
1157 | switch (optname) { | |
1158 | case DCCP_SOCKOPT_CCID_RX_INFO: | |
1159 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) | |
1160 | return -EINVAL; | |
1161 | len = sizeof(hcrx->ccid3hcrx_tfrc); | |
1162 | val = &hcrx->ccid3hcrx_tfrc; | |
1163 | break; | |
1164 | default: | |
1165 | return -ENOPROTOOPT; | |
1166 | } | |
1167 | ||
1168 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1169 | return -EFAULT; | |
1170 | ||
1171 | return 0; | |
1172 | } | |
1173 | ||
1174 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, | |
1175 | u32 __user *optval, int __user *optlen) | |
1176 | { | |
1177 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
1178 | const void *val; | |
1179 | ||
1180 | /* Listen socks doesn't have a private CCID block */ | |
1181 | if (sk->sk_state == DCCP_LISTEN) | |
1182 | return -EINVAL; | |
1183 | ||
1184 | switch (optname) { | |
1185 | case DCCP_SOCKOPT_CCID_TX_INFO: | |
1186 | if (len < sizeof(hctx->ccid3hctx_tfrc)) | |
1187 | return -EINVAL; | |
1188 | len = sizeof(hctx->ccid3hctx_tfrc); | |
1189 | val = &hctx->ccid3hctx_tfrc; | |
1190 | break; | |
1191 | default: | |
1192 | return -ENOPROTOOPT; | |
1193 | } | |
1194 | ||
1195 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1196 | return -EFAULT; | |
1197 | ||
1198 | return 0; | |
1199 | } | |
1200 | ||
91f0ebf7 | 1201 | static struct ccid_operations ccid3 = { |
3dd9a7c3 | 1202 | .ccid_id = DCCPC_CCID3, |
7c657876 ACM |
1203 | .ccid_name = "ccid3", |
1204 | .ccid_owner = THIS_MODULE, | |
91f0ebf7 | 1205 | .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), |
7c657876 ACM |
1206 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
1207 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, | |
1208 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, | |
1209 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, | |
1210 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, | |
1211 | .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, | |
1212 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, | |
91f0ebf7 | 1213 | .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), |
7c657876 ACM |
1214 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
1215 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, | |
1216 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, | |
1217 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, | |
2babe1f6 ACM |
1218 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
1219 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, | |
88f964db ACM |
1220 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
1221 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, | |
7c657876 ACM |
1222 | }; |
1223 | ||
56724aa4 | 1224 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
1225 | module_param(ccid3_debug, int, 0444); |
1226 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); | |
56724aa4 | 1227 | #endif |
7c657876 ACM |
1228 | |
1229 | static __init int ccid3_module_init(void) | |
1230 | { | |
8c60f3fa | 1231 | int rc = -ENOBUFS; |
7c657876 | 1232 | |
8c60f3fa ACM |
1233 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
1234 | if (ccid3_rx_hist == NULL) | |
7c657876 ACM |
1235 | goto out; |
1236 | ||
8c60f3fa ACM |
1237 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
1238 | if (ccid3_tx_hist == NULL) | |
1239 | goto out_free_rx; | |
7c657876 | 1240 | |
ae6706f0 ACM |
1241 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
1242 | if (ccid3_li_hist == NULL) | |
8c60f3fa | 1243 | goto out_free_tx; |
7c657876 ACM |
1244 | |
1245 | rc = ccid_register(&ccid3); | |
1246 | if (rc != 0) | |
1247 | goto out_free_loss_interval_history; | |
7c657876 ACM |
1248 | out: |
1249 | return rc; | |
8c60f3fa | 1250 | |
7c657876 | 1251 | out_free_loss_interval_history: |
ae6706f0 ACM |
1252 | dccp_li_hist_delete(ccid3_li_hist); |
1253 | ccid3_li_hist = NULL; | |
8c60f3fa ACM |
1254 | out_free_tx: |
1255 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1256 | ccid3_tx_hist = NULL; | |
1257 | out_free_rx: | |
1258 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1259 | ccid3_rx_hist = NULL; | |
7c657876 ACM |
1260 | goto out; |
1261 | } | |
1262 | module_init(ccid3_module_init); | |
1263 | ||
1264 | static __exit void ccid3_module_exit(void) | |
1265 | { | |
1266 | ccid_unregister(&ccid3); | |
1267 | ||
8c60f3fa ACM |
1268 | if (ccid3_tx_hist != NULL) { |
1269 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1270 | ccid3_tx_hist = NULL; | |
7c657876 | 1271 | } |
8c60f3fa ACM |
1272 | if (ccid3_rx_hist != NULL) { |
1273 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1274 | ccid3_rx_hist = NULL; | |
7c657876 | 1275 | } |
ae6706f0 ACM |
1276 | if (ccid3_li_hist != NULL) { |
1277 | dccp_li_hist_delete(ccid3_li_hist); | |
1278 | ccid3_li_hist = NULL; | |
7c657876 ACM |
1279 | } |
1280 | } | |
1281 | module_exit(ccid3_module_exit); | |
1282 | ||
e6bccd35 | 1283 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
1f2333ae | 1284 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
7c657876 ACM |
1285 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
1286 | MODULE_LICENSE("GPL"); | |
1287 | MODULE_ALIAS("net-dccp-ccid-3"); |