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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 | ||
56724aa4 GR |
44 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
45 | static int ccid3_debug; | |
46 | #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) | |
7c657876 ACM |
47 | #else |
48 | #define ccid3_pr_debug(format, a...) | |
49 | #endif | |
50 | ||
a1d3a355 ACM |
51 | static struct dccp_tx_hist *ccid3_tx_hist; |
52 | static struct dccp_rx_hist *ccid3_rx_hist; | |
ae6706f0 | 53 | static struct dccp_li_hist *ccid3_li_hist; |
7c657876 | 54 | |
56724aa4 | 55 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
56 | static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) |
57 | { | |
58 | static char *ccid3_state_names[] = { | |
59 | [TFRC_SSTATE_NO_SENT] = "NO_SENT", | |
60 | [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", | |
61 | [TFRC_SSTATE_FBACK] = "FBACK", | |
62 | [TFRC_SSTATE_TERM] = "TERM", | |
63 | }; | |
64 | ||
65 | return ccid3_state_names[state]; | |
66 | } | |
67 | #endif | |
68 | ||
c25a18ba ACM |
69 | static void ccid3_hc_tx_set_state(struct sock *sk, |
70 | enum ccid3_hc_tx_states state) | |
7c657876 | 71 | { |
59725dc2 | 72 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 ACM |
73 | enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; |
74 | ||
75 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
76 | dccp_role(sk), sk, ccid3_tx_state_name(oldstate), |
77 | ccid3_tx_state_name(state)); | |
7c657876 ACM |
78 | WARN_ON(state == oldstate); |
79 | hctx->ccid3hctx_state = state; | |
80 | } | |
81 | ||
17893bc1 GR |
82 | /* |
83 | * Recalculate scheduled nominal send time t_nom, inter-packet interval | |
84 | * t_ipi, and delta value. Should be called after each change to X. | |
85 | */ | |
86 | static inline void ccid3_update_send_time(struct ccid3_hc_tx_sock *hctx) | |
7c657876 | 87 | { |
17893bc1 GR |
88 | timeval_sub_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
89 | ||
1a21e49a GR |
90 | /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */ |
91 | hctx->ccid3hctx_t_ipi = scaled_div(hctx->ccid3hctx_s, | |
92 | hctx->ccid3hctx_x >> 6); | |
7c657876 | 93 | |
17893bc1 GR |
94 | /* Update nominal send time with regard to the new t_ipi */ |
95 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); | |
96 | ||
97 | /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ | |
1f2333ae ACM |
98 | hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, |
99 | TFRC_OPSYS_HALF_TIME_GRAN); | |
7c657876 | 100 | } |
7c657876 ACM |
101 | /* |
102 | * Update X by | |
103 | * If (p > 0) | |
5c3fbb6a | 104 | * X_calc = calcX(s, R, p); |
7c657876 ACM |
105 | * X = max(min(X_calc, 2 * X_recv), s / t_mbi); |
106 | * Else | |
107 | * If (now - tld >= R) | |
108 | * X = max(min(2 * X, 2 * X_recv), s / R); | |
109 | * tld = now; | |
5c3fbb6a | 110 | * |
1a21e49a GR |
111 | * Note: X and X_recv are both stored in units of 64 * bytes/second, to support |
112 | * fine-grained resolution of sending rates. This requires scaling by 2^6 | |
113 | * throughout the code. Only X_calc is unscaled (in bytes/second). | |
114 | * | |
5c3fbb6a GR |
115 | * If X has changed, we also update the scheduled send time t_now, |
116 | * the inter-packet interval t_ipi, and the delta value. | |
1a21e49a | 117 | */ |
a79ef76f GR |
118 | static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now) |
119 | ||
7c657876 | 120 | { |
59725dc2 | 121 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
1a21e49a | 122 | const __u64 old_x = hctx->ccid3hctx_x; |
7c657876 | 123 | |
44158306 | 124 | if (hctx->ccid3hctx_p > 0) { |
1a21e49a | 125 | |
9e8efc82 | 126 | hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6, |
8109b02b | 127 | hctx->ccid3hctx_x_recv * 2); |
9e8efc82 GR |
128 | hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, |
129 | (((__u64)hctx->ccid3hctx_s) << 6) / | |
8109b02b | 130 | TFRC_T_MBI); |
a79ef76f | 131 | |
0f9e5b57 | 132 | } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) - |
8109b02b | 133 | (suseconds_t)hctx->ccid3hctx_rtt >= 0) { |
1a21e49a | 134 | |
9e8efc82 GR |
135 | hctx->ccid3hctx_x = |
136 | max(2 * min(hctx->ccid3hctx_x, hctx->ccid3hctx_x_recv), | |
137 | scaled_div(((__u64)hctx->ccid3hctx_s) << 6, | |
8109b02b | 138 | hctx->ccid3hctx_rtt)); |
a79ef76f | 139 | hctx->ccid3hctx_t_ld = *now; |
ff586298 | 140 | } |
b6ee3d4a | 141 | |
17893bc1 GR |
142 | if (hctx->ccid3hctx_x != old_x) |
143 | ccid3_update_send_time(hctx); | |
7c657876 ACM |
144 | } |
145 | ||
78ad713d | 146 | /* |
8109b02b ACM |
147 | * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) |
148 | * @len: DCCP packet payload size in bytes | |
78ad713d GR |
149 | */ |
150 | static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) | |
151 | { | |
353b13e1 GR |
152 | hctx->ccid3hctx_s = hctx->ccid3hctx_s == 0 ? len : |
153 | (9 * hctx->ccid3hctx_s + len) / 10; | |
78ad713d GR |
154 | /* |
155 | * Note: We could do a potential optimisation here - when `s' changes, | |
156 | * recalculate sending rate and consequently t_ipi, t_delta, and | |
157 | * t_now. This is however non-standard, and the benefits are not | |
158 | * clear, so it is currently left out. | |
159 | */ | |
160 | } | |
161 | ||
9f8681db | 162 | /* |
8109b02b ACM |
163 | * Update Window Counter using the algorithm from [RFC 4342, 8.1]. |
164 | * The algorithm is not applicable if RTT < 4 microseconds. | |
9f8681db GR |
165 | */ |
166 | static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, | |
167 | struct timeval *now) | |
168 | { | |
169 | suseconds_t delta; | |
170 | u32 quarter_rtts; | |
171 | ||
172 | if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ | |
173 | return; | |
174 | ||
175 | delta = timeval_delta(now, &hctx->ccid3hctx_t_last_win_count); | |
176 | DCCP_BUG_ON(delta < 0); | |
177 | ||
178 | quarter_rtts = (u32)delta / (hctx->ccid3hctx_rtt / 4); | |
179 | ||
180 | if (quarter_rtts > 0) { | |
181 | hctx->ccid3hctx_t_last_win_count = *now; | |
182 | hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); | |
183 | hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ | |
184 | ||
185 | ccid3_pr_debug("now at %#X\n", hctx->ccid3hctx_last_win_count); | |
186 | } | |
187 | } | |
188 | ||
7c657876 ACM |
189 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) |
190 | { | |
191 | struct sock *sk = (struct sock *)data; | |
59725dc2 | 192 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
2a1fda6f | 193 | unsigned long t_nfb = USEC_PER_SEC / 5; |
7c657876 ACM |
194 | |
195 | bh_lock_sock(sk); | |
196 | if (sock_owned_by_user(sk)) { | |
197 | /* Try again later. */ | |
198 | /* XXX: set some sensible MIB */ | |
48e03eee | 199 | goto restart_timer; |
7c657876 ACM |
200 | } |
201 | ||
a9672411 | 202 | ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk, |
7c657876 | 203 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
a9672411 | 204 | |
7c657876 | 205 | switch (hctx->ccid3hctx_state) { |
7c657876 | 206 | case TFRC_SSTATE_NO_FBACK: |
a79ef76f | 207 | /* RFC 3448, 4.4: Halve send rate directly */ |
9e8efc82 GR |
208 | hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2, |
209 | (((__u64)hctx->ccid3hctx_s) << 6) / | |
210 | TFRC_T_MBI); | |
7c657876 | 211 | |
a9672411 GR |
212 | ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u " |
213 | "bytes/s\n", dccp_role(sk), sk, | |
1f2333ae | 214 | ccid3_tx_state_name(hctx->ccid3hctx_state), |
1a21e49a | 215 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
48e03eee GR |
216 | /* The value of R is still undefined and so we can not recompute |
217 | * the timout value. Keep initial value as per [RFC 4342, 5]. */ | |
2a1fda6f | 218 | t_nfb = TFRC_INITIAL_TIMEOUT; |
17893bc1 | 219 | ccid3_update_send_time(hctx); |
7c657876 ACM |
220 | break; |
221 | case TFRC_SSTATE_FBACK: | |
1f2333ae ACM |
222 | /* |
223 | * Check if IDLE since last timeout and recv rate is less than | |
1a21e49a | 224 | * 4 packets (in units of 64*bytes/sec) per RTT |
1f2333ae | 225 | */ |
1f2333ae | 226 | if (!hctx->ccid3hctx_idle || |
1a21e49a | 227 | (hctx->ccid3hctx_x_recv >= 4 * |
8109b02b ACM |
228 | scaled_div(((__u64)hctx->ccid3hctx_s) << 6, |
229 | hctx->ccid3hctx_rtt))) { | |
a79ef76f GR |
230 | struct timeval now; |
231 | ||
a9672411 | 232 | ccid3_pr_debug("%s(%p, state=%s), not idle\n", |
1f2333ae | 233 | dccp_role(sk), sk, |
8109b02b | 234 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
7c657876 | 235 | |
ff586298 GR |
236 | /* |
237 | * Modify the cached value of X_recv [RFC 3448, 4.4] | |
238 | * | |
239 | * If (p == 0 || X_calc > 2 * X_recv) | |
7c657876 ACM |
240 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); |
241 | * Else | |
242 | * X_recv = X_calc / 4; | |
1a21e49a GR |
243 | * |
244 | * Note that X_recv is scaled by 2^6 while X_calc is not | |
7c657876 | 245 | */ |
44158306 | 246 | BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); |
7c657876 | 247 | |
44158306 | 248 | if (hctx->ccid3hctx_p == 0 || |
8109b02b ACM |
249 | (hctx->ccid3hctx_x_calc > |
250 | (hctx->ccid3hctx_x_recv >> 5))) { | |
1a21e49a GR |
251 | |
252 | hctx->ccid3hctx_x_recv = | |
9e8efc82 GR |
253 | max(hctx->ccid3hctx_x_recv / 2, |
254 | (((__u64)hctx->ccid3hctx_s) << 6) / | |
8109b02b | 255 | (2 * TFRC_T_MBI)); |
1a21e49a | 256 | |
ff586298 GR |
257 | if (hctx->ccid3hctx_p == 0) |
258 | dccp_timestamp(sk, &now); | |
9e8efc82 GR |
259 | } else { |
260 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc; | |
261 | hctx->ccid3hctx_x_recv <<= 4; | |
262 | } | |
ff586298 | 263 | /* Now recalculate X [RFC 3448, 4.3, step (4)] */ |
a79ef76f | 264 | ccid3_hc_tx_update_x(sk, &now); |
7c657876 | 265 | } |
6b5e633a ACM |
266 | /* |
267 | * Schedule no feedback timer to expire in | |
8a508ac2 GR |
268 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
269 | * See comments in packet_recv() regarding the value of t_RTO. | |
6b5e633a | 270 | */ |
8a508ac2 | 271 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
7c657876 | 272 | break; |
59348b19 | 273 | case TFRC_SSTATE_NO_SENT: |
a9672411 | 274 | DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk), sk); |
59348b19 GR |
275 | /* fall through */ |
276 | case TFRC_SSTATE_TERM: | |
7c657876 ACM |
277 | goto out; |
278 | } | |
279 | ||
7c657876 | 280 | hctx->ccid3hctx_idle = 1; |
48e03eee GR |
281 | |
282 | restart_timer: | |
283 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
c9eaf173 | 284 | jiffies + usecs_to_jiffies(t_nfb)); |
7c657876 ACM |
285 | out: |
286 | bh_unlock_sock(sk); | |
287 | sock_put(sk); | |
288 | } | |
289 | ||
7da7f456 GR |
290 | /* |
291 | * returns | |
292 | * > 0: delay (in msecs) that should pass before actually sending | |
293 | * = 0: can send immediately | |
294 | * < 0: error condition; do not send packet | |
295 | */ | |
6b57c93d | 296 | static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
297 | { |
298 | struct dccp_sock *dp = dccp_sk(sk); | |
59725dc2 | 299 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 300 | struct timeval now; |
0f9e5b57 | 301 | suseconds_t delay; |
7c657876 | 302 | |
59348b19 | 303 | BUG_ON(hctx == NULL); |
1f2333ae | 304 | |
7c657876 | 305 | /* |
da335baf GR |
306 | * This function is called only for Data and DataAck packets. Sending |
307 | * zero-sized Data(Ack)s is theoretically possible, but for congestion | |
308 | * control this case is pathological - ignore it. | |
7c657876 | 309 | */ |
6b57c93d | 310 | if (unlikely(skb->len == 0)) |
da335baf | 311 | return -EBADMSG; |
7c657876 | 312 | |
b0e56780 | 313 | dccp_timestamp(sk, &now); |
7c657876 ACM |
314 | |
315 | switch (hctx->ccid3hctx_state) { | |
316 | case TFRC_SSTATE_NO_SENT: | |
1f2333ae | 317 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
8109b02b | 318 | (jiffies + |
c9eaf173 | 319 | usecs_to_jiffies(TFRC_INITIAL_TIMEOUT))); |
7c657876 ACM |
320 | hctx->ccid3hctx_last_win_count = 0; |
321 | hctx->ccid3hctx_t_last_win_count = now; | |
322 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); | |
7c657876 | 323 | |
1a21e49a | 324 | /* Set initial sending rate X/s to 1pps (X is scaled by 2^6) */ |
6b57c93d | 325 | ccid3_hc_tx_update_s(hctx, skb->len); |
9e8efc82 GR |
326 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; |
327 | hctx->ccid3hctx_x <<= 6; | |
78ad713d | 328 | |
90feeb95 GR |
329 | /* First timeout, according to [RFC 3448, 4.2], is 1 second */ |
330 | hctx->ccid3hctx_t_ipi = USEC_PER_SEC; | |
331 | /* Initial delta: minimum of 0.5 sec and t_gran/2 */ | |
332 | hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; | |
333 | ||
334 | /* Set t_0 for initial packet */ | |
7c657876 | 335 | hctx->ccid3hctx_t_nom = now; |
7c657876 ACM |
336 | break; |
337 | case TFRC_SSTATE_NO_FBACK: | |
338 | case TFRC_SSTATE_FBACK: | |
91cf5a17 GR |
339 | delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); |
340 | /* | |
8109b02b | 341 | * Scheduling of packet transmissions [RFC 3448, 4.6] |
91cf5a17 GR |
342 | * |
343 | * if (t_now > t_nom - delta) | |
344 | * // send the packet now | |
345 | * else | |
346 | * // send the packet in (t_nom - t_now) milliseconds. | |
347 | */ | |
0f9e5b57 | 348 | if (delay - (suseconds_t)hctx->ccid3hctx_delta >= 0) |
7da7f456 | 349 | return delay / 1000L; |
9f8681db GR |
350 | |
351 | ccid3_hc_tx_update_win_count(hctx, &now); | |
7c657876 | 352 | break; |
59348b19 | 353 | case TFRC_SSTATE_TERM: |
a9672411 | 354 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
7da7f456 | 355 | return -EINVAL; |
7c657876 ACM |
356 | } |
357 | ||
7da7f456 GR |
358 | /* prepare to send now (add options etc.) */ |
359 | dp->dccps_hc_tx_insert_options = 1; | |
e312d100 GR |
360 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; |
361 | ||
362 | /* set the nominal send time for the next following packet */ | |
7da7f456 GR |
363 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
364 | ||
365 | return 0; | |
7c657876 ACM |
366 | } |
367 | ||
8109b02b ACM |
368 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, |
369 | unsigned int len) | |
7c657876 | 370 | { |
59725dc2 | 371 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 372 | struct timeval now; |
6b57c93d | 373 | struct dccp_tx_hist_entry *packet; |
7c657876 | 374 | |
59348b19 | 375 | BUG_ON(hctx == NULL); |
7c657876 | 376 | |
6b57c93d | 377 | ccid3_hc_tx_update_s(hctx, len); |
7c657876 | 378 | |
c5a1ae9a | 379 | packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC); |
6b57c93d | 380 | if (unlikely(packet == NULL)) { |
c5a1ae9a | 381 | DCCP_CRIT("packet history - out of memory!"); |
6b57c93d GR |
382 | return; |
383 | } | |
c5a1ae9a GR |
384 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, packet); |
385 | ||
386 | dccp_timestamp(sk, &now); | |
6b57c93d | 387 | packet->dccphtx_tstamp = now; |
c5a1ae9a GR |
388 | packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss; |
389 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; | |
390 | packet->dccphtx_sent = 1; | |
391 | hctx->ccid3hctx_idle = 0; | |
7c657876 ACM |
392 | } |
393 | ||
394 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) | |
395 | { | |
59725dc2 ACM |
396 | const struct dccp_sock *dp = dccp_sk(sk); |
397 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 | 398 | struct ccid3_options_received *opt_recv; |
8c60f3fa | 399 | struct dccp_tx_hist_entry *packet; |
b0e56780 | 400 | struct timeval now; |
2a1fda6f | 401 | unsigned long t_nfb; |
7c657876 | 402 | u32 pinv; |
1fba78b6 | 403 | suseconds_t r_sample, t_elapsed; |
1f2333ae | 404 | |
59348b19 | 405 | BUG_ON(hctx == NULL); |
7c657876 ACM |
406 | |
407 | /* we are only interested in ACKs */ | |
408 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || | |
409 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) | |
410 | return; | |
411 | ||
412 | opt_recv = &hctx->ccid3hctx_options_received; | |
413 | ||
7c657876 | 414 | switch (hctx->ccid3hctx_state) { |
7c657876 ACM |
415 | case TFRC_SSTATE_NO_FBACK: |
416 | case TFRC_SSTATE_FBACK: | |
5c3fbb6a | 417 | /* get packet from history to look up t_recvdata */ |
8c60f3fa | 418 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
8109b02b | 419 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
59d203f9 | 420 | if (unlikely(packet == NULL)) { |
5c3fbb6a | 421 | DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " |
59348b19 | 422 | "in history!\n", dccp_role(sk), sk, |
59d203f9 | 423 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
8109b02b | 424 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
7c657876 ACM |
425 | return; |
426 | } | |
427 | ||
1a21e49a | 428 | /* Update receive rate in units of 64 * bytes/second */ |
9e8efc82 GR |
429 | hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; |
430 | hctx->ccid3hctx_x_recv <<= 6; | |
5c3fbb6a GR |
431 | |
432 | /* Update loss event rate */ | |
433 | pinv = opt_recv->ccid3or_loss_event_rate; | |
45393a66 | 434 | if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ |
5c3fbb6a | 435 | hctx->ccid3hctx_p = 0; |
45393a66 | 436 | else /* can not exceed 100% */ |
8109b02b | 437 | hctx->ccid3hctx_p = 1000000 / pinv; |
5c3fbb6a | 438 | |
b0e56780 | 439 | dccp_timestamp(sk, &now); |
5c3fbb6a GR |
440 | |
441 | /* | |
442 | * Calculate new round trip sample as per [RFC 3448, 4.3] by | |
8109b02b | 443 | * R_sample = (now - t_recvdata) - t_elapsed |
5c3fbb6a GR |
444 | */ |
445 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); | |
446 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; | |
447 | ||
0f9e5b57 GR |
448 | DCCP_BUG_ON(r_sample < 0); |
449 | if (unlikely(r_sample <= t_elapsed)) | |
1fba78b6 ACM |
450 | DCCP_WARN("WARNING: r_sample=%dus <= t_elapsed=%dus\n", |
451 | (int)r_sample, (int)t_elapsed); | |
1a28599a ACM |
452 | else |
453 | r_sample -= t_elapsed; | |
de553c18 | 454 | CCID3_RTT_SANITY_CHECK(r_sample); |
7c657876 | 455 | |
de553c18 | 456 | /* Update RTT estimate by |
7c657876 ACM |
457 | * If (No feedback recv) |
458 | * R = R_sample; | |
459 | * Else | |
460 | * R = q * R + (1 - q) * R_sample; | |
461 | * | |
462 | * q is a constant, RFC 3448 recomments 0.9 | |
463 | */ | |
464 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { | |
1a21e49a GR |
465 | /* |
466 | * Larger Initial Windows [RFC 4342, sec. 5] | |
467 | * We deviate in that we use `s' instead of `MSS'. | |
468 | */ | |
8109b02b | 469 | __u64 w_init = min(4 * hctx->ccid3hctx_s, |
9e8efc82 | 470 | max(2 * hctx->ccid3hctx_s, 4380)); |
a79ef76f | 471 | hctx->ccid3hctx_rtt = r_sample; |
9e8efc82 | 472 | hctx->ccid3hctx_x = scaled_div(w_init << 6, r_sample); |
a79ef76f GR |
473 | hctx->ccid3hctx_t_ld = now; |
474 | ||
475 | ccid3_update_send_time(hctx); | |
7c657876 | 476 | |
9e8efc82 | 477 | ccid3_pr_debug("%s(%p), s=%u, w_init=%llu, " |
1fba78b6 | 478 | "R_sample=%dus, X=%u\n", dccp_role(sk), |
0f08461e AM |
479 | sk, hctx->ccid3hctx_s, |
480 | (unsigned long long)w_init, | |
8109b02b | 481 | (int)r_sample, |
1a21e49a | 482 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
7c657876 | 483 | |
5c3fbb6a GR |
484 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); |
485 | } else { | |
486 | hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + | |
c9eaf173 | 487 | (u32)r_sample) / 10; |
7c657876 | 488 | |
ff586298 GR |
489 | /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ |
490 | if (hctx->ccid3hctx_p > 0) | |
491 | hctx->ccid3hctx_x_calc = | |
492 | tfrc_calc_x(hctx->ccid3hctx_s, | |
493 | hctx->ccid3hctx_rtt, | |
494 | hctx->ccid3hctx_p); | |
5c3fbb6a | 495 | ccid3_hc_tx_update_x(sk, &now); |
7c657876 | 496 | |
1fba78b6 | 497 | ccid3_pr_debug("%s(%p), RTT=%uus (sample=%dus), s=%u, " |
8109b02b ACM |
498 | "p=%u, X_calc=%u, X_recv=%u, X=%u\n", |
499 | dccp_role(sk), | |
1fba78b6 | 500 | sk, hctx->ccid3hctx_rtt, (int)r_sample, |
5c3fbb6a GR |
501 | hctx->ccid3hctx_s, hctx->ccid3hctx_p, |
502 | hctx->ccid3hctx_x_calc, | |
9e8efc82 | 503 | (unsigned)(hctx->ccid3hctx_x_recv >> 6), |
8109b02b | 504 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
7c657876 ACM |
505 | } |
506 | ||
507 | /* unschedule no feedback timer */ | |
508 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
509 | ||
7c657876 | 510 | /* remove all packets older than the one acked from history */ |
8c60f3fa ACM |
511 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
512 | &hctx->ccid3hctx_hist, packet); | |
c530cfb1 | 513 | /* |
8109b02b ACM |
514 | * As we have calculated new ipi, delta, t_nom it is possible |
515 | * that we now can send a packet, so wake up dccp_wait_for_ccid | |
c530cfb1 ACM |
516 | */ |
517 | sk->sk_write_space(sk); | |
8c60f3fa | 518 | |
8a508ac2 GR |
519 | /* |
520 | * Update timeout interval for the nofeedback timer. | |
521 | * We use a configuration option to increase the lower bound. | |
8109b02b ACM |
522 | * This can help avoid triggering the nofeedback timer too |
523 | * often ('spinning') on LANs with small RTTs. | |
8a508ac2 | 524 | */ |
5d0dbc4a | 525 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
8a508ac2 | 526 | CONFIG_IP_DCCP_CCID3_RTO * |
8109b02b | 527 | (USEC_PER_SEC/1000)); |
1f2333ae ACM |
528 | /* |
529 | * Schedule no feedback timer to expire in | |
8a508ac2 | 530 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
1f2333ae | 531 | */ |
8a508ac2 | 532 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
7c657876 | 533 | |
a9672411 | 534 | ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " |
8109b02b ACM |
535 | "expire in %lu jiffies (%luus)\n", |
536 | dccp_role(sk), | |
a9672411 GR |
537 | sk, usecs_to_jiffies(t_nfb), t_nfb); |
538 | ||
539 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
2a1fda6f | 540 | jiffies + usecs_to_jiffies(t_nfb)); |
7c657876 ACM |
541 | |
542 | /* set idle flag */ | |
bf58a381 | 543 | hctx->ccid3hctx_idle = 1; |
7c657876 | 544 | break; |
151a9931 | 545 | case TFRC_SSTATE_NO_SENT: /* fall through */ |
5e19e3fc | 546 | case TFRC_SSTATE_TERM: /* ignore feedback when closing */ |
7c657876 ACM |
547 | break; |
548 | } | |
549 | } | |
550 | ||
7c657876 | 551 | static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, |
1f2333ae ACM |
552 | unsigned char len, u16 idx, |
553 | unsigned char *value) | |
7c657876 ACM |
554 | { |
555 | int rc = 0; | |
59725dc2 ACM |
556 | const struct dccp_sock *dp = dccp_sk(sk); |
557 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 ACM |
558 | struct ccid3_options_received *opt_recv; |
559 | ||
59d203f9 | 560 | BUG_ON(hctx == NULL); |
7c657876 ACM |
561 | |
562 | opt_recv = &hctx->ccid3hctx_options_received; | |
563 | ||
564 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { | |
565 | opt_recv->ccid3or_seqno = dp->dccps_gsr; | |
566 | opt_recv->ccid3or_loss_event_rate = ~0; | |
567 | opt_recv->ccid3or_loss_intervals_idx = 0; | |
568 | opt_recv->ccid3or_loss_intervals_len = 0; | |
569 | opt_recv->ccid3or_receive_rate = 0; | |
570 | } | |
571 | ||
572 | switch (option) { | |
573 | case TFRC_OPT_LOSS_EVENT_RATE: | |
59d203f9 | 574 | if (unlikely(len != 4)) { |
a9672411 | 575 | DCCP_WARN("%s(%p), invalid len %d " |
59348b19 GR |
576 | "for TFRC_OPT_LOSS_EVENT_RATE\n", |
577 | dccp_role(sk), sk, len); | |
7c657876 ACM |
578 | rc = -EINVAL; |
579 | } else { | |
8109b02b ACM |
580 | opt_recv->ccid3or_loss_event_rate = |
581 | ntohl(*(__be32 *)value); | |
a9672411 | 582 | ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", |
7c657876 ACM |
583 | dccp_role(sk), sk, |
584 | opt_recv->ccid3or_loss_event_rate); | |
585 | } | |
586 | break; | |
587 | case TFRC_OPT_LOSS_INTERVALS: | |
588 | opt_recv->ccid3or_loss_intervals_idx = idx; | |
589 | opt_recv->ccid3or_loss_intervals_len = len; | |
a9672411 | 590 | ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n", |
7c657876 ACM |
591 | dccp_role(sk), sk, |
592 | opt_recv->ccid3or_loss_intervals_idx, | |
593 | opt_recv->ccid3or_loss_intervals_len); | |
594 | break; | |
595 | case TFRC_OPT_RECEIVE_RATE: | |
59d203f9 | 596 | if (unlikely(len != 4)) { |
a9672411 | 597 | DCCP_WARN("%s(%p), invalid len %d " |
59348b19 GR |
598 | "for TFRC_OPT_RECEIVE_RATE\n", |
599 | dccp_role(sk), sk, len); | |
7c657876 ACM |
600 | rc = -EINVAL; |
601 | } else { | |
8109b02b ACM |
602 | opt_recv->ccid3or_receive_rate = |
603 | ntohl(*(__be32 *)value); | |
a9672411 | 604 | ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", |
7c657876 ACM |
605 | dccp_role(sk), sk, |
606 | opt_recv->ccid3or_receive_rate); | |
607 | } | |
608 | break; | |
609 | } | |
610 | ||
611 | return rc; | |
612 | } | |
613 | ||
91f0ebf7 | 614 | static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) |
7c657876 | 615 | { |
91f0ebf7 | 616 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
7c657876 | 617 | |
78ad713d | 618 | hctx->ccid3hctx_s = 0; |
fe0499ae | 619 | hctx->ccid3hctx_rtt = 0; |
7c657876 ACM |
620 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
621 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); | |
aa5d7df3 | 622 | |
8109b02b ACM |
623 | hctx->ccid3hctx_no_feedback_timer.function = |
624 | ccid3_hc_tx_no_feedback_timer; | |
aa5d7df3 | 625 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; |
7c657876 ACM |
626 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
627 | ||
628 | return 0; | |
629 | } | |
630 | ||
631 | static void ccid3_hc_tx_exit(struct sock *sk) | |
632 | { | |
59725dc2 | 633 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 634 | |
7c657876 ACM |
635 | BUG_ON(hctx == NULL); |
636 | ||
637 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); | |
638 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
639 | ||
640 | /* Empty packet history */ | |
8c60f3fa | 641 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
7c657876 ACM |
642 | } |
643 | ||
644 | /* | |
645 | * RX Half Connection methods | |
646 | */ | |
647 | ||
56724aa4 | 648 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
649 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
650 | { | |
651 | static char *ccid3_rx_state_names[] = { | |
652 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", | |
653 | [TFRC_RSTATE_DATA] = "DATA", | |
654 | [TFRC_RSTATE_TERM] = "TERM", | |
655 | }; | |
656 | ||
657 | return ccid3_rx_state_names[state]; | |
658 | } | |
659 | #endif | |
660 | ||
c25a18ba ACM |
661 | static void ccid3_hc_rx_set_state(struct sock *sk, |
662 | enum ccid3_hc_rx_states state) | |
7c657876 | 663 | { |
59725dc2 | 664 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 ACM |
665 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
666 | ||
667 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
668 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
669 | ccid3_rx_state_name(state)); | |
7c657876 ACM |
670 | WARN_ON(state == oldstate); |
671 | hcrx->ccid3hcrx_state = state; | |
672 | } | |
673 | ||
78ad713d GR |
674 | static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) |
675 | { | |
676 | if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ | |
677 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); | |
678 | else | |
679 | hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : | |
680 | (9 * hcrx->ccid3hcrx_s + len) / 10; | |
681 | } | |
682 | ||
7c657876 ACM |
683 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
684 | { | |
59725dc2 | 685 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 686 | struct dccp_sock *dp = dccp_sk(sk); |
8c60f3fa | 687 | struct dccp_rx_hist_entry *packet; |
b6ee3d4a | 688 | struct timeval now; |
0f9e5b57 | 689 | suseconds_t delta; |
7c657876 | 690 | |
a9672411 | 691 | ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk), sk); |
7c657876 | 692 | |
b0e56780 | 693 | dccp_timestamp(sk, &now); |
b6ee3d4a | 694 | |
7c657876 ACM |
695 | switch (hcrx->ccid3hcrx_state) { |
696 | case TFRC_RSTATE_NO_DATA: | |
697 | hcrx->ccid3hcrx_x_recv = 0; | |
698 | break; | |
0f9e5b57 GR |
699 | case TFRC_RSTATE_DATA: |
700 | delta = timeval_delta(&now, | |
701 | &hcrx->ccid3hcrx_tstamp_last_feedback); | |
702 | DCCP_BUG_ON(delta < 0); | |
b9039a2a GR |
703 | hcrx->ccid3hcrx_x_recv = |
704 | scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); | |
7c657876 | 705 | break; |
59348b19 | 706 | case TFRC_RSTATE_TERM: |
a9672411 | 707 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
7c657876 ACM |
708 | return; |
709 | } | |
710 | ||
8c60f3fa | 711 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
59d203f9 | 712 | if (unlikely(packet == NULL)) { |
a9672411 | 713 | DCCP_WARN("%s(%p), no data packet in history!\n", |
59348b19 | 714 | dccp_role(sk), sk); |
7c657876 ACM |
715 | return; |
716 | } | |
717 | ||
b6ee3d4a | 718 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
66a377c5 | 719 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
7c657876 ACM |
720 | hcrx->ccid3hcrx_bytes_recv = 0; |
721 | ||
0f9e5b57 GR |
722 | /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */ |
723 | delta = timeval_delta(&now, &packet->dccphrx_tstamp); | |
724 | DCCP_BUG_ON(delta < 0); | |
725 | hcrx->ccid3hcrx_elapsed_time = delta / 10; | |
45393a66 | 726 | |
7c657876 | 727 | if (hcrx->ccid3hcrx_p == 0) |
45393a66 GR |
728 | hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ |
729 | else if (hcrx->ccid3hcrx_p > 1000000) { | |
730 | DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); | |
731 | hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ | |
732 | } else | |
7c657876 | 733 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; |
45393a66 | 734 | |
507d37cf | 735 | dp->dccps_hc_rx_insert_options = 1; |
7c657876 ACM |
736 | dccp_send_ack(sk); |
737 | } | |
738 | ||
2d0817d1 | 739 | static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 740 | { |
59d203f9 | 741 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
60fe62e7 | 742 | __be32 x_recv, pinv; |
7c657876 | 743 | |
59d203f9 ACM |
744 | BUG_ON(hcrx == NULL); |
745 | ||
746 | if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) | |
2d0817d1 | 747 | return 0; |
7c657876 | 748 | |
66a377c5 | 749 | DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; |
4fded33b ACM |
750 | |
751 | if (dccp_packet_without_ack(skb)) | |
2d0817d1 ACM |
752 | return 0; |
753 | ||
4fded33b ACM |
754 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
755 | pinv = htonl(hcrx->ccid3hcrx_pinv); | |
2d0817d1 ACM |
756 | |
757 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && | |
758 | dccp_insert_option_elapsed_time(sk, skb, | |
759 | hcrx->ccid3hcrx_elapsed_time)) || | |
760 | dccp_insert_option_timestamp(sk, skb) || | |
761 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, | |
8109b02b | 762 | &pinv, sizeof(pinv)) || |
2d0817d1 | 763 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, |
8109b02b | 764 | &x_recv, sizeof(x_recv))) |
2d0817d1 ACM |
765 | return -1; |
766 | ||
767 | return 0; | |
7c657876 ACM |
768 | } |
769 | ||
7c657876 ACM |
770 | /* calculate first loss interval |
771 | * | |
772 | * returns estimated loss interval in usecs */ | |
773 | ||
774 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) | |
775 | { | |
59725dc2 | 776 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
8c60f3fa | 777 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
0f9e5b57 GR |
778 | u32 x_recv, p; |
779 | suseconds_t rtt, delta; | |
b6ee3d4a | 780 | struct timeval tstamp = { 0, }; |
7c657876 ACM |
781 | int interval = 0; |
782 | int win_count = 0; | |
783 | int step = 0; | |
bfe24a6c | 784 | u64 fval; |
7c657876 | 785 | |
8c60f3fa ACM |
786 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
787 | dccphrx_node) { | |
788 | if (dccp_rx_hist_entry_data_packet(entry)) { | |
7c657876 ACM |
789 | tail = entry; |
790 | ||
791 | switch (step) { | |
792 | case 0: | |
8c60f3fa | 793 | tstamp = entry->dccphrx_tstamp; |
c1734376 | 794 | win_count = entry->dccphrx_ccval; |
7c657876 ACM |
795 | step = 1; |
796 | break; | |
797 | case 1: | |
c1734376 | 798 | interval = win_count - entry->dccphrx_ccval; |
7c657876 ACM |
799 | if (interval < 0) |
800 | interval += TFRC_WIN_COUNT_LIMIT; | |
801 | if (interval > 4) | |
802 | goto found; | |
803 | break; | |
804 | } | |
805 | } | |
806 | } | |
807 | ||
59d203f9 | 808 | if (unlikely(step == 0)) { |
a9672411 | 809 | DCCP_WARN("%s(%p), packet history has no data packets!\n", |
59348b19 | 810 | dccp_role(sk), sk); |
7c657876 ACM |
811 | return ~0; |
812 | } | |
813 | ||
59d203f9 | 814 | if (unlikely(interval == 0)) { |
a9672411 | 815 | DCCP_WARN("%s(%p), Could not find a win_count interval > 0." |
59348b19 | 816 | "Defaulting to 1\n", dccp_role(sk), sk); |
7c657876 ACM |
817 | interval = 1; |
818 | } | |
819 | found: | |
66a377c5 | 820 | if (!tail) { |
59348b19 | 821 | DCCP_CRIT("tail is null\n"); |
66a377c5 IM |
822 | return ~0; |
823 | } | |
0f9e5b57 GR |
824 | |
825 | delta = timeval_delta(&tstamp, &tail->dccphrx_tstamp); | |
826 | DCCP_BUG_ON(delta < 0); | |
827 | ||
828 | rtt = delta * 4 / interval; | |
1fba78b6 ACM |
829 | ccid3_pr_debug("%s(%p), approximated RTT to %dus\n", |
830 | dccp_role(sk), sk, (int)rtt); | |
59348b19 | 831 | |
bfe24a6c GR |
832 | /* |
833 | * Determine the length of the first loss interval via inverse lookup. | |
834 | * Assume that X_recv can be computed by the throughput equation | |
8109b02b ACM |
835 | * s |
836 | * X_recv = -------- | |
837 | * R * fval | |
bfe24a6c GR |
838 | * Find some p such that f(p) = fval; return 1/p [RFC 3448, 6.3.1]. |
839 | */ | |
840 | if (rtt == 0) { /* would result in divide-by-zero */ | |
832e3ca6 IM |
841 | DCCP_WARN("RTT==0\n"); |
842 | return ~0; | |
59348b19 | 843 | } |
7c657876 | 844 | |
b0e56780 ACM |
845 | dccp_timestamp(sk, &tstamp); |
846 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); | |
0f9e5b57 | 847 | DCCP_BUG_ON(delta <= 0); |
7c657876 | 848 | |
0f9e5b57 | 849 | x_recv = scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); |
bfe24a6c GR |
850 | if (x_recv == 0) { /* would also trigger divide-by-zero */ |
851 | DCCP_WARN("X_recv==0\n"); | |
852 | if ((x_recv = hcrx->ccid3hcrx_x_recv) == 0) { | |
853 | DCCP_BUG("stored value of X_recv is zero"); | |
832e3ca6 | 854 | return ~0; |
bfe24a6c | 855 | } |
66a377c5 IM |
856 | } |
857 | ||
bfe24a6c GR |
858 | fval = scaled_div(hcrx->ccid3hcrx_s, rtt); |
859 | fval = scaled_div32(fval, x_recv); | |
36729c1a | 860 | p = tfrc_calc_x_reverse_lookup(fval); |
bfe24a6c | 861 | |
a9672411 | 862 | ccid3_pr_debug("%s(%p), receive rate=%u bytes/s, implied " |
1f2333ae | 863 | "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); |
7c657876 ACM |
864 | |
865 | if (p == 0) | |
866 | return ~0; | |
867 | else | |
8109b02b | 868 | return 1000000 / p; |
7c657876 ACM |
869 | } |
870 | ||
871 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) | |
872 | { | |
59725dc2 | 873 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
fc747e82 | 874 | struct dccp_li_hist_entry *head; |
66a377c5 | 875 | u64 seq_temp; |
7c657876 | 876 | |
66a377c5 IM |
877 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
878 | if (!dccp_li_hist_interval_new(ccid3_li_hist, | |
879 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) | |
880 | return; | |
7c657876 | 881 | |
fc747e82 IM |
882 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
883 | struct dccp_li_hist_entry, dccplih_node); | |
884 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); | |
66a377c5 IM |
885 | } else { |
886 | struct dccp_li_hist_entry *entry; | |
887 | struct list_head *tail; | |
888 | ||
fc747e82 IM |
889 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
890 | struct dccp_li_hist_entry, dccplih_node); | |
66a377c5 IM |
891 | /* FIXME win count check removed as was wrong */ |
892 | /* should make this check with receive history */ | |
893 | /* and compare there as per section 10.2 of RFC4342 */ | |
894 | ||
895 | /* new loss event detected */ | |
896 | /* calculate last interval length */ | |
897 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); | |
54e6ecb2 | 898 | entry = dccp_li_hist_entry_new(ccid3_li_hist, GFP_ATOMIC); |
66a377c5 IM |
899 | |
900 | if (entry == NULL) { | |
59348b19 | 901 | DCCP_BUG("out of memory - can not allocate entry"); |
ae6706f0 | 902 | return; |
66a377c5 IM |
903 | } |
904 | ||
905 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); | |
906 | ||
907 | tail = hcrx->ccid3hcrx_li_hist.prev; | |
908 | list_del(tail); | |
909 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); | |
910 | ||
911 | /* Create the newest interval */ | |
912 | entry->dccplih_seqno = seq_loss; | |
913 | entry->dccplih_interval = seq_temp; | |
914 | entry->dccplih_win_count = win_loss; | |
915 | } | |
7c657876 ACM |
916 | } |
917 | ||
66a377c5 | 918 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
c9eaf173 | 919 | struct dccp_rx_hist_entry *packet) |
7c657876 | 920 | { |
59725dc2 | 921 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
8109b02b ACM |
922 | struct dccp_rx_hist_entry *rx_hist = |
923 | dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); | |
66a377c5 IM |
924 | u64 seqno = packet->dccphrx_seqno; |
925 | u64 tmp_seqno; | |
926 | int loss = 0; | |
927 | u8 ccval; | |
928 | ||
929 | ||
930 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
931 | ||
932 | if (!rx_hist || | |
933 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
934 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
935 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
936 | goto detect_out; | |
937 | } | |
938 | ||
7c657876 | 939 | |
66a377c5 IM |
940 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
941 | > TFRC_RECV_NUM_LATE_LOSS) { | |
942 | loss = 1; | |
943 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, | |
944 | hcrx->ccid3hcrx_ccval_nonloss); | |
945 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
946 | dccp_inc_seqno(&tmp_seqno); | |
947 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
948 | dccp_inc_seqno(&tmp_seqno); | |
949 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, | |
950 | tmp_seqno, &ccval)) { | |
8109b02b | 951 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
66a377c5 IM |
952 | hcrx->ccid3hcrx_ccval_nonloss = ccval; |
953 | dccp_inc_seqno(&tmp_seqno); | |
954 | } | |
955 | } | |
956 | ||
957 | /* FIXME - this code could be simplified with above while */ | |
958 | /* but works at moment */ | |
959 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
960 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
961 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
962 | } | |
963 | ||
964 | detect_out: | |
965 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, | |
966 | &hcrx->ccid3hcrx_li_hist, packet, | |
967 | hcrx->ccid3hcrx_seqno_nonloss); | |
968 | return loss; | |
7c657876 ACM |
969 | } |
970 | ||
7c657876 ACM |
971 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
972 | { | |
59725dc2 | 973 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
4fded33b | 974 | const struct dccp_options_received *opt_recv; |
8c60f3fa | 975 | struct dccp_rx_hist_entry *packet; |
7c657876 | 976 | struct timeval now; |
0f9e5b57 GR |
977 | u32 p_prev, rtt_prev; |
978 | suseconds_t r_sample, t_elapsed; | |
78ad713d | 979 | int loss, payload_size; |
1f2333ae | 980 | |
59348b19 | 981 | BUG_ON(hcrx == NULL); |
7c657876 | 982 | |
59725dc2 | 983 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
4fded33b | 984 | |
7c657876 ACM |
985 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
986 | case DCCP_PKT_ACK: | |
987 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
988 | return; | |
989 | case DCCP_PKT_DATAACK: | |
4fded33b | 990 | if (opt_recv->dccpor_timestamp_echo == 0) |
7c657876 | 991 | break; |
66a377c5 | 992 | rtt_prev = hcrx->ccid3hcrx_rtt; |
b0e56780 | 993 | dccp_timestamp(sk, &now); |
b3a3077d ACM |
994 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
995 | r_sample = timeval_usecs(&now); | |
996 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; | |
997 | ||
0f9e5b57 | 998 | DCCP_BUG_ON(r_sample < 0); |
b3a3077d | 999 | if (unlikely(r_sample <= t_elapsed)) |
0f9e5b57 | 1000 | DCCP_WARN("r_sample=%ldus, t_elapsed=%ldus\n", |
0f08461e | 1001 | (long)r_sample, (long)t_elapsed); |
b3a3077d ACM |
1002 | else |
1003 | r_sample -= t_elapsed; | |
de553c18 | 1004 | CCID3_RTT_SANITY_CHECK(r_sample); |
b3a3077d ACM |
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 | 1012 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
a9672411 GR |
1013 | ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n", |
1014 | dccp_role(sk), sk, hcrx->ccid3hcrx_rtt, | |
4fded33b | 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)) { |
a9672411 | 1026 | DCCP_WARN("%s(%p), Not enough mem to add rx packet " |
59348b19 | 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: | |
a9672411 GR |
1041 | ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial " |
1042 | "feedback\n", dccp_role(sk), sk, | |
1f2333ae | 1043 | dccp_state_name(sk->sk_state), skb); |
7c657876 ACM |
1044 | ccid3_hc_rx_send_feedback(sk); |
1045 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); | |
1046 | return; | |
1047 | case TFRC_RSTATE_DATA: | |
78ad713d | 1048 | hcrx->ccid3hcrx_bytes_recv += payload_size; |
66a377c5 | 1049 | if (loss) |
b6ee3d4a ACM |
1050 | break; |
1051 | ||
b0e56780 | 1052 | dccp_timestamp(sk, &now); |
8109b02b ACM |
1053 | if ((timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) - |
1054 | (suseconds_t)hcrx->ccid3hcrx_rtt) >= 0) { | |
b6ee3d4a ACM |
1055 | hcrx->ccid3hcrx_tstamp_last_ack = now; |
1056 | ccid3_hc_rx_send_feedback(sk); | |
7c657876 | 1057 | } |
b6ee3d4a | 1058 | return; |
59348b19 | 1059 | case TFRC_RSTATE_TERM: |
a9672411 | 1060 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
7c657876 ACM |
1061 | return; |
1062 | } | |
1063 | ||
1064 | /* Dealing with packet loss */ | |
a9672411 | 1065 | ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n", |
4fded33b | 1066 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); |
7c657876 | 1067 | |
7c657876 | 1068 | p_prev = hcrx->ccid3hcrx_p; |
c9eaf173 | 1069 | |
7c657876 | 1070 | /* Calculate loss event rate */ |
c0996660 IM |
1071 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
1072 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); | |
1073 | ||
7c657876 | 1074 | /* Scaling up by 1000000 as fixed decimal */ |
c0996660 IM |
1075 | if (i_mean != 0) |
1076 | hcrx->ccid3hcrx_p = 1000000 / i_mean; | |
59348b19 GR |
1077 | } else |
1078 | DCCP_BUG("empty loss history"); | |
7c657876 ACM |
1079 | |
1080 | if (hcrx->ccid3hcrx_p > p_prev) { | |
1081 | ccid3_hc_rx_send_feedback(sk); | |
1082 | return; | |
1083 | } | |
1084 | } | |
1085 | ||
91f0ebf7 | 1086 | static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) |
7c657876 | 1087 | { |
91f0ebf7 | 1088 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
7c657876 | 1089 | |
a9672411 | 1090 | ccid3_pr_debug("entry\n"); |
7c657876 | 1091 | |
7c657876 ACM |
1092 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; |
1093 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); | |
ae6706f0 | 1094 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
b0e56780 | 1095 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
954ee31f | 1096 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
78ad713d | 1097 | hcrx->ccid3hcrx_s = 0; |
fe0499ae | 1098 | hcrx->ccid3hcrx_rtt = 0; |
7c657876 ACM |
1099 | return 0; |
1100 | } | |
1101 | ||
1102 | static void ccid3_hc_rx_exit(struct sock *sk) | |
1103 | { | |
59725dc2 | 1104 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 1105 | |
59d203f9 | 1106 | BUG_ON(hcrx == NULL); |
7c657876 ACM |
1107 | |
1108 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); | |
1109 | ||
1110 | /* Empty packet history */ | |
8c60f3fa | 1111 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
7c657876 ACM |
1112 | |
1113 | /* Empty loss interval history */ | |
ae6706f0 | 1114 | dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); |
7c657876 ACM |
1115 | } |
1116 | ||
2babe1f6 ACM |
1117 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
1118 | { | |
59725dc2 | 1119 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_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(hcrx == NULL); |
2babe1f6 | 1126 | |
8109b02b ACM |
1127 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; |
1128 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; | |
1129 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; | |
2babe1f6 ACM |
1130 | } |
1131 | ||
1132 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) | |
1133 | { | |
59725dc2 | 1134 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
2babe1f6 | 1135 | |
59c2353d ACM |
1136 | /* Listen socks doesn't have a private CCID block */ |
1137 | if (sk->sk_state == DCCP_LISTEN) | |
1138 | return; | |
1139 | ||
59d203f9 | 1140 | BUG_ON(hctx == NULL); |
2babe1f6 ACM |
1141 | |
1142 | info->tcpi_rto = hctx->ccid3hctx_t_rto; | |
1143 | info->tcpi_rtt = hctx->ccid3hctx_rtt; | |
1144 | } | |
1145 | ||
88f964db ACM |
1146 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
1147 | u32 __user *optval, int __user *optlen) | |
1148 | { | |
1149 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); | |
1150 | const void *val; | |
c9eaf173 | 1151 | |
88f964db ACM |
1152 | /* Listen socks doesn't have a private CCID block */ |
1153 | if (sk->sk_state == DCCP_LISTEN) | |
1154 | return -EINVAL; | |
1155 | ||
1156 | switch (optname) { | |
1157 | case DCCP_SOCKOPT_CCID_RX_INFO: | |
1158 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) | |
1159 | return -EINVAL; | |
1160 | len = sizeof(hcrx->ccid3hcrx_tfrc); | |
1161 | val = &hcrx->ccid3hcrx_tfrc; | |
1162 | break; | |
1163 | default: | |
1164 | return -ENOPROTOOPT; | |
1165 | } | |
1166 | ||
1167 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1168 | return -EFAULT; | |
1169 | ||
1170 | return 0; | |
1171 | } | |
1172 | ||
1173 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, | |
1174 | u32 __user *optval, int __user *optlen) | |
1175 | { | |
1176 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
1177 | const void *val; | |
c9eaf173 | 1178 | |
88f964db ACM |
1179 | /* Listen socks doesn't have a private CCID block */ |
1180 | if (sk->sk_state == DCCP_LISTEN) | |
1181 | return -EINVAL; | |
1182 | ||
1183 | switch (optname) { | |
1184 | case DCCP_SOCKOPT_CCID_TX_INFO: | |
1185 | if (len < sizeof(hctx->ccid3hctx_tfrc)) | |
1186 | return -EINVAL; | |
1187 | len = sizeof(hctx->ccid3hctx_tfrc); | |
1188 | val = &hctx->ccid3hctx_tfrc; | |
1189 | break; | |
1190 | default: | |
1191 | return -ENOPROTOOPT; | |
1192 | } | |
1193 | ||
1194 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1195 | return -EFAULT; | |
1196 | ||
1197 | return 0; | |
1198 | } | |
1199 | ||
91f0ebf7 | 1200 | static struct ccid_operations ccid3 = { |
3dd9a7c3 | 1201 | .ccid_id = DCCPC_CCID3, |
7c657876 ACM |
1202 | .ccid_name = "ccid3", |
1203 | .ccid_owner = THIS_MODULE, | |
91f0ebf7 | 1204 | .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), |
7c657876 ACM |
1205 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
1206 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, | |
1207 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, | |
1208 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, | |
1209 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, | |
7c657876 | 1210 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, |
91f0ebf7 | 1211 | .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), |
7c657876 ACM |
1212 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
1213 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, | |
1214 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, | |
1215 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, | |
2babe1f6 ACM |
1216 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
1217 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, | |
88f964db ACM |
1218 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
1219 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, | |
7c657876 | 1220 | }; |
8109b02b | 1221 | |
56724aa4 | 1222 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
1223 | module_param(ccid3_debug, int, 0444); |
1224 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); | |
56724aa4 | 1225 | #endif |
7c657876 ACM |
1226 | |
1227 | static __init int ccid3_module_init(void) | |
1228 | { | |
8c60f3fa | 1229 | int rc = -ENOBUFS; |
7c657876 | 1230 | |
8c60f3fa ACM |
1231 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
1232 | if (ccid3_rx_hist == NULL) | |
7c657876 ACM |
1233 | goto out; |
1234 | ||
8c60f3fa ACM |
1235 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
1236 | if (ccid3_tx_hist == NULL) | |
1237 | goto out_free_rx; | |
7c657876 | 1238 | |
ae6706f0 ACM |
1239 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
1240 | if (ccid3_li_hist == NULL) | |
8c60f3fa | 1241 | goto out_free_tx; |
7c657876 ACM |
1242 | |
1243 | rc = ccid_register(&ccid3); | |
8109b02b | 1244 | if (rc != 0) |
7c657876 | 1245 | goto out_free_loss_interval_history; |
7c657876 ACM |
1246 | out: |
1247 | return rc; | |
8c60f3fa | 1248 | |
7c657876 | 1249 | out_free_loss_interval_history: |
ae6706f0 ACM |
1250 | dccp_li_hist_delete(ccid3_li_hist); |
1251 | ccid3_li_hist = NULL; | |
8c60f3fa ACM |
1252 | out_free_tx: |
1253 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1254 | ccid3_tx_hist = NULL; | |
1255 | out_free_rx: | |
1256 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1257 | ccid3_rx_hist = NULL; | |
7c657876 ACM |
1258 | goto out; |
1259 | } | |
1260 | module_init(ccid3_module_init); | |
1261 | ||
1262 | static __exit void ccid3_module_exit(void) | |
1263 | { | |
1264 | ccid_unregister(&ccid3); | |
1265 | ||
8c60f3fa ACM |
1266 | if (ccid3_tx_hist != NULL) { |
1267 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1268 | ccid3_tx_hist = NULL; | |
7c657876 | 1269 | } |
8c60f3fa ACM |
1270 | if (ccid3_rx_hist != NULL) { |
1271 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1272 | ccid3_rx_hist = NULL; | |
7c657876 | 1273 | } |
ae6706f0 ACM |
1274 | if (ccid3_li_hist != NULL) { |
1275 | dccp_li_hist_delete(ccid3_li_hist); | |
1276 | ccid3_li_hist = NULL; | |
7c657876 ACM |
1277 | } |
1278 | } | |
1279 | module_exit(ccid3_module_exit); | |
1280 | ||
e6bccd35 | 1281 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
1f2333ae | 1282 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
7c657876 ACM |
1283 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
1284 | MODULE_LICENSE("GPL"); | |
1285 | MODULE_ALIAS("net-dccp-ccid-3"); |