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 | */ | |
7c657876 ACM |
36 | #include "../ccid.h" |
37 | #include "../dccp.h" | |
4524b259 | 38 | #include "lib/packet_history.h" |
ae6706f0 | 39 | #include "lib/loss_interval.h" |
36729c1a | 40 | #include "lib/tfrc.h" |
7c657876 ACM |
41 | #include "ccid3.h" |
42 | ||
56724aa4 GR |
43 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
44 | static int ccid3_debug; | |
45 | #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) | |
7c657876 ACM |
46 | #else |
47 | #define ccid3_pr_debug(format, a...) | |
48 | #endif | |
49 | ||
a1d3a355 ACM |
50 | static struct dccp_tx_hist *ccid3_tx_hist; |
51 | static struct dccp_rx_hist *ccid3_rx_hist; | |
ae6706f0 | 52 | static struct dccp_li_hist *ccid3_li_hist; |
7c657876 | 53 | |
9bf17475 GR |
54 | /* |
55 | * Transmitter Half-Connection Routines | |
56 | */ | |
56724aa4 | 57 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
58 | static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) |
59 | { | |
60 | static char *ccid3_state_names[] = { | |
61 | [TFRC_SSTATE_NO_SENT] = "NO_SENT", | |
62 | [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", | |
63 | [TFRC_SSTATE_FBACK] = "FBACK", | |
64 | [TFRC_SSTATE_TERM] = "TERM", | |
65 | }; | |
66 | ||
67 | return ccid3_state_names[state]; | |
68 | } | |
69 | #endif | |
70 | ||
c25a18ba ACM |
71 | static void ccid3_hc_tx_set_state(struct sock *sk, |
72 | enum ccid3_hc_tx_states state) | |
7c657876 | 73 | { |
59725dc2 | 74 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 ACM |
75 | enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; |
76 | ||
77 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
78 | dccp_role(sk), sk, ccid3_tx_state_name(oldstate), |
79 | ccid3_tx_state_name(state)); | |
7c657876 ACM |
80 | WARN_ON(state == oldstate); |
81 | hctx->ccid3hctx_state = state; | |
82 | } | |
83 | ||
17893bc1 | 84 | /* |
1266adee | 85 | * Recalculate t_ipi and delta (should be called whenever X changes) |
17893bc1 | 86 | */ |
1266adee | 87 | static inline void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hctx) |
7c657876 | 88 | { |
1a21e49a GR |
89 | /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */ |
90 | hctx->ccid3hctx_t_ipi = scaled_div(hctx->ccid3hctx_s, | |
91 | hctx->ccid3hctx_x >> 6); | |
7c657876 | 92 | |
17893bc1 | 93 | /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ |
1f2333ae ACM |
94 | hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, |
95 | TFRC_OPSYS_HALF_TIME_GRAN); | |
8699be7d | 96 | |
1761f7d7 | 97 | ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n", |
8699be7d | 98 | hctx->ccid3hctx_t_ipi, hctx->ccid3hctx_delta, |
1761f7d7 | 99 | hctx->ccid3hctx_s, (unsigned)(hctx->ccid3hctx_x >> 6)); |
8699be7d | 100 | |
7c657876 | 101 | } |
7c657876 ACM |
102 | /* |
103 | * Update X by | |
104 | * If (p > 0) | |
5c3fbb6a | 105 | * X_calc = calcX(s, R, p); |
7c657876 ACM |
106 | * X = max(min(X_calc, 2 * X_recv), s / t_mbi); |
107 | * Else | |
108 | * If (now - tld >= R) | |
109 | * X = max(min(2 * X, 2 * X_recv), s / R); | |
110 | * tld = now; | |
5c3fbb6a | 111 | * |
1a21e49a GR |
112 | * Note: X and X_recv are both stored in units of 64 * bytes/second, to support |
113 | * fine-grained resolution of sending rates. This requires scaling by 2^6 | |
114 | * throughout the code. Only X_calc is unscaled (in bytes/second). | |
115 | * | |
1a21e49a | 116 | */ |
a79ef76f GR |
117 | static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now) |
118 | ||
7c657876 | 119 | { |
59725dc2 | 120 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
1a21e49a | 121 | const __u64 old_x = hctx->ccid3hctx_x; |
7c657876 | 122 | |
44158306 | 123 | if (hctx->ccid3hctx_p > 0) { |
1a21e49a | 124 | |
9e8efc82 | 125 | hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6, |
8109b02b | 126 | hctx->ccid3hctx_x_recv * 2); |
9e8efc82 GR |
127 | hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, |
128 | (((__u64)hctx->ccid3hctx_s) << 6) / | |
8109b02b | 129 | TFRC_T_MBI); |
a79ef76f | 130 | |
0f9e5b57 | 131 | } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) - |
8109b02b | 132 | (suseconds_t)hctx->ccid3hctx_rtt >= 0) { |
1a21e49a | 133 | |
9e8efc82 GR |
134 | hctx->ccid3hctx_x = |
135 | max(2 * min(hctx->ccid3hctx_x, hctx->ccid3hctx_x_recv), | |
136 | scaled_div(((__u64)hctx->ccid3hctx_s) << 6, | |
8109b02b | 137 | hctx->ccid3hctx_rtt)); |
a79ef76f | 138 | hctx->ccid3hctx_t_ld = *now; |
ff586298 | 139 | } |
b6ee3d4a | 140 | |
8699be7d | 141 | if (hctx->ccid3hctx_x != old_x) { |
1761f7d7 GR |
142 | ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, " |
143 | "X_recv=%u\n", (unsigned)(old_x >> 6), | |
144 | (unsigned)(hctx->ccid3hctx_x >> 6), | |
145 | hctx->ccid3hctx_x_calc, | |
146 | (unsigned)(hctx->ccid3hctx_x_recv >> 6)); | |
8699be7d | 147 | |
1266adee | 148 | ccid3_update_send_interval(hctx); |
8699be7d | 149 | } |
7c657876 ACM |
150 | } |
151 | ||
78ad713d | 152 | /* |
8109b02b ACM |
153 | * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) |
154 | * @len: DCCP packet payload size in bytes | |
78ad713d GR |
155 | */ |
156 | static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) | |
157 | { | |
1266adee GR |
158 | const u16 old_s = hctx->ccid3hctx_s; |
159 | ||
160 | hctx->ccid3hctx_s = old_s == 0 ? len : (9 * old_s + len) / 10; | |
161 | ||
162 | if (hctx->ccid3hctx_s != old_s) | |
163 | ccid3_update_send_interval(hctx); | |
78ad713d GR |
164 | } |
165 | ||
9f8681db | 166 | /* |
8109b02b ACM |
167 | * Update Window Counter using the algorithm from [RFC 4342, 8.1]. |
168 | * The algorithm is not applicable if RTT < 4 microseconds. | |
9f8681db GR |
169 | */ |
170 | static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, | |
171 | struct timeval *now) | |
172 | { | |
173 | suseconds_t delta; | |
174 | u32 quarter_rtts; | |
175 | ||
176 | if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ | |
177 | return; | |
178 | ||
179 | delta = timeval_delta(now, &hctx->ccid3hctx_t_last_win_count); | |
180 | DCCP_BUG_ON(delta < 0); | |
181 | ||
182 | quarter_rtts = (u32)delta / (hctx->ccid3hctx_rtt / 4); | |
183 | ||
184 | if (quarter_rtts > 0) { | |
185 | hctx->ccid3hctx_t_last_win_count = *now; | |
186 | hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); | |
187 | hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ | |
188 | ||
189 | ccid3_pr_debug("now at %#X\n", hctx->ccid3hctx_last_win_count); | |
190 | } | |
191 | } | |
192 | ||
7c657876 ACM |
193 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) |
194 | { | |
195 | struct sock *sk = (struct sock *)data; | |
59725dc2 | 196 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
2a1fda6f | 197 | unsigned long t_nfb = USEC_PER_SEC / 5; |
7c657876 ACM |
198 | |
199 | bh_lock_sock(sk); | |
200 | if (sock_owned_by_user(sk)) { | |
201 | /* Try again later. */ | |
202 | /* XXX: set some sensible MIB */ | |
48e03eee | 203 | goto restart_timer; |
7c657876 ACM |
204 | } |
205 | ||
a9672411 | 206 | ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk, |
7c657876 | 207 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
a9672411 | 208 | |
7c657876 | 209 | switch (hctx->ccid3hctx_state) { |
7c657876 | 210 | case TFRC_SSTATE_NO_FBACK: |
a79ef76f | 211 | /* RFC 3448, 4.4: Halve send rate directly */ |
9e8efc82 GR |
212 | hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2, |
213 | (((__u64)hctx->ccid3hctx_s) << 6) / | |
214 | TFRC_T_MBI); | |
7c657876 | 215 | |
a9672411 GR |
216 | ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u " |
217 | "bytes/s\n", dccp_role(sk), sk, | |
1f2333ae | 218 | ccid3_tx_state_name(hctx->ccid3hctx_state), |
1a21e49a | 219 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
48e03eee GR |
220 | /* The value of R is still undefined and so we can not recompute |
221 | * the timout value. Keep initial value as per [RFC 4342, 5]. */ | |
2a1fda6f | 222 | t_nfb = TFRC_INITIAL_TIMEOUT; |
1266adee | 223 | ccid3_update_send_interval(hctx); |
7c657876 ACM |
224 | break; |
225 | case TFRC_SSTATE_FBACK: | |
1f2333ae ACM |
226 | /* |
227 | * Check if IDLE since last timeout and recv rate is less than | |
1a21e49a | 228 | * 4 packets (in units of 64*bytes/sec) per RTT |
1f2333ae | 229 | */ |
1f2333ae | 230 | if (!hctx->ccid3hctx_idle || |
1a21e49a | 231 | (hctx->ccid3hctx_x_recv >= 4 * |
8109b02b ACM |
232 | scaled_div(((__u64)hctx->ccid3hctx_s) << 6, |
233 | hctx->ccid3hctx_rtt))) { | |
a79ef76f GR |
234 | struct timeval now; |
235 | ||
a9672411 | 236 | ccid3_pr_debug("%s(%p, state=%s), not idle\n", |
1f2333ae | 237 | dccp_role(sk), sk, |
8109b02b | 238 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
7c657876 | 239 | |
ff586298 GR |
240 | /* |
241 | * Modify the cached value of X_recv [RFC 3448, 4.4] | |
242 | * | |
243 | * If (p == 0 || X_calc > 2 * X_recv) | |
7c657876 ACM |
244 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); |
245 | * Else | |
246 | * X_recv = X_calc / 4; | |
1a21e49a GR |
247 | * |
248 | * Note that X_recv is scaled by 2^6 while X_calc is not | |
7c657876 | 249 | */ |
44158306 | 250 | BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); |
7c657876 | 251 | |
44158306 | 252 | if (hctx->ccid3hctx_p == 0 || |
8109b02b ACM |
253 | (hctx->ccid3hctx_x_calc > |
254 | (hctx->ccid3hctx_x_recv >> 5))) { | |
1a21e49a GR |
255 | |
256 | hctx->ccid3hctx_x_recv = | |
9e8efc82 GR |
257 | max(hctx->ccid3hctx_x_recv / 2, |
258 | (((__u64)hctx->ccid3hctx_s) << 6) / | |
8109b02b | 259 | (2 * TFRC_T_MBI)); |
1a21e49a | 260 | |
ff586298 GR |
261 | if (hctx->ccid3hctx_p == 0) |
262 | dccp_timestamp(sk, &now); | |
9e8efc82 GR |
263 | } else { |
264 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc; | |
265 | hctx->ccid3hctx_x_recv <<= 4; | |
266 | } | |
ff586298 | 267 | /* Now recalculate X [RFC 3448, 4.3, step (4)] */ |
a79ef76f | 268 | ccid3_hc_tx_update_x(sk, &now); |
7c657876 | 269 | } |
6b5e633a ACM |
270 | /* |
271 | * Schedule no feedback timer to expire in | |
8a508ac2 GR |
272 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
273 | * See comments in packet_recv() regarding the value of t_RTO. | |
6b5e633a | 274 | */ |
8a508ac2 | 275 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
7c657876 | 276 | break; |
59348b19 | 277 | case TFRC_SSTATE_NO_SENT: |
a9672411 | 278 | DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk), sk); |
59348b19 GR |
279 | /* fall through */ |
280 | case TFRC_SSTATE_TERM: | |
7c657876 ACM |
281 | goto out; |
282 | } | |
283 | ||
7c657876 | 284 | hctx->ccid3hctx_idle = 1; |
48e03eee GR |
285 | |
286 | restart_timer: | |
287 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
c9eaf173 | 288 | jiffies + usecs_to_jiffies(t_nfb)); |
7c657876 ACM |
289 | out: |
290 | bh_unlock_sock(sk); | |
291 | sock_put(sk); | |
292 | } | |
293 | ||
7da7f456 GR |
294 | /* |
295 | * returns | |
296 | * > 0: delay (in msecs) that should pass before actually sending | |
297 | * = 0: can send immediately | |
298 | * < 0: error condition; do not send packet | |
299 | */ | |
6b57c93d | 300 | static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
301 | { |
302 | struct dccp_sock *dp = dccp_sk(sk); | |
59725dc2 | 303 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 304 | struct timeval now; |
0f9e5b57 | 305 | suseconds_t delay; |
7c657876 | 306 | |
59348b19 | 307 | BUG_ON(hctx == NULL); |
1f2333ae | 308 | |
7c657876 | 309 | /* |
da335baf GR |
310 | * This function is called only for Data and DataAck packets. Sending |
311 | * zero-sized Data(Ack)s is theoretically possible, but for congestion | |
312 | * control this case is pathological - ignore it. | |
7c657876 | 313 | */ |
6b57c93d | 314 | if (unlikely(skb->len == 0)) |
da335baf | 315 | return -EBADMSG; |
7c657876 | 316 | |
b0e56780 | 317 | dccp_timestamp(sk, &now); |
7c657876 ACM |
318 | |
319 | switch (hctx->ccid3hctx_state) { | |
320 | case TFRC_SSTATE_NO_SENT: | |
1f2333ae | 321 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
8109b02b | 322 | (jiffies + |
c9eaf173 | 323 | usecs_to_jiffies(TFRC_INITIAL_TIMEOUT))); |
7c657876 ACM |
324 | hctx->ccid3hctx_last_win_count = 0; |
325 | hctx->ccid3hctx_t_last_win_count = now; | |
326 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); | |
7c657876 | 327 | |
1a21e49a | 328 | /* Set initial sending rate X/s to 1pps (X is scaled by 2^6) */ |
1266adee | 329 | hctx->ccid3hctx_x = hctx->ccid3hctx_s = skb->len; |
9e8efc82 | 330 | hctx->ccid3hctx_x <<= 6; |
78ad713d | 331 | |
90feeb95 GR |
332 | /* First timeout, according to [RFC 3448, 4.2], is 1 second */ |
333 | hctx->ccid3hctx_t_ipi = USEC_PER_SEC; | |
334 | /* Initial delta: minimum of 0.5 sec and t_gran/2 */ | |
335 | hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; | |
336 | ||
337 | /* Set t_0 for initial packet */ | |
7c657876 | 338 | hctx->ccid3hctx_t_nom = now; |
7c657876 ACM |
339 | break; |
340 | case TFRC_SSTATE_NO_FBACK: | |
341 | case TFRC_SSTATE_FBACK: | |
91cf5a17 | 342 | delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); |
8699be7d | 343 | ccid3_pr_debug("delay=%ld\n", (long)delay); |
91cf5a17 | 344 | /* |
8109b02b | 345 | * Scheduling of packet transmissions [RFC 3448, 4.6] |
91cf5a17 GR |
346 | * |
347 | * if (t_now > t_nom - delta) | |
348 | * // send the packet now | |
349 | * else | |
350 | * // send the packet in (t_nom - t_now) milliseconds. | |
351 | */ | |
0f9e5b57 | 352 | if (delay - (suseconds_t)hctx->ccid3hctx_delta >= 0) |
7da7f456 | 353 | return delay / 1000L; |
9f8681db GR |
354 | |
355 | ccid3_hc_tx_update_win_count(hctx, &now); | |
7c657876 | 356 | break; |
59348b19 | 357 | case TFRC_SSTATE_TERM: |
a9672411 | 358 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
7da7f456 | 359 | return -EINVAL; |
7c657876 ACM |
360 | } |
361 | ||
7da7f456 GR |
362 | /* prepare to send now (add options etc.) */ |
363 | dp->dccps_hc_tx_insert_options = 1; | |
e312d100 GR |
364 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; |
365 | ||
366 | /* set the nominal send time for the next following packet */ | |
7da7f456 GR |
367 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
368 | ||
369 | return 0; | |
7c657876 ACM |
370 | } |
371 | ||
8109b02b ACM |
372 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, |
373 | unsigned int len) | |
7c657876 | 374 | { |
59725dc2 | 375 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 376 | struct timeval now; |
6b57c93d | 377 | struct dccp_tx_hist_entry *packet; |
7c657876 | 378 | |
59348b19 | 379 | BUG_ON(hctx == NULL); |
7c657876 | 380 | |
6b57c93d | 381 | ccid3_hc_tx_update_s(hctx, len); |
7c657876 | 382 | |
c5a1ae9a | 383 | packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC); |
6b57c93d | 384 | if (unlikely(packet == NULL)) { |
c5a1ae9a | 385 | DCCP_CRIT("packet history - out of memory!"); |
6b57c93d GR |
386 | return; |
387 | } | |
c5a1ae9a GR |
388 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, packet); |
389 | ||
390 | dccp_timestamp(sk, &now); | |
6b57c93d | 391 | packet->dccphtx_tstamp = now; |
c5a1ae9a GR |
392 | packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss; |
393 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; | |
394 | packet->dccphtx_sent = 1; | |
395 | hctx->ccid3hctx_idle = 0; | |
7c657876 ACM |
396 | } |
397 | ||
398 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) | |
399 | { | |
59725dc2 ACM |
400 | const struct dccp_sock *dp = dccp_sk(sk); |
401 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 | 402 | struct ccid3_options_received *opt_recv; |
8c60f3fa | 403 | struct dccp_tx_hist_entry *packet; |
b0e56780 | 404 | struct timeval now; |
2a1fda6f | 405 | unsigned long t_nfb; |
7c657876 | 406 | u32 pinv; |
1fba78b6 | 407 | suseconds_t r_sample, t_elapsed; |
1f2333ae | 408 | |
59348b19 | 409 | BUG_ON(hctx == NULL); |
7c657876 ACM |
410 | |
411 | /* we are only interested in ACKs */ | |
412 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || | |
413 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) | |
414 | return; | |
415 | ||
416 | opt_recv = &hctx->ccid3hctx_options_received; | |
417 | ||
7c657876 | 418 | switch (hctx->ccid3hctx_state) { |
7c657876 ACM |
419 | case TFRC_SSTATE_NO_FBACK: |
420 | case TFRC_SSTATE_FBACK: | |
5c3fbb6a | 421 | /* get packet from history to look up t_recvdata */ |
8c60f3fa | 422 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
8109b02b | 423 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
59d203f9 | 424 | if (unlikely(packet == NULL)) { |
5c3fbb6a | 425 | DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " |
59348b19 | 426 | "in history!\n", dccp_role(sk), sk, |
59d203f9 | 427 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
8109b02b | 428 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
7c657876 ACM |
429 | return; |
430 | } | |
431 | ||
1a21e49a | 432 | /* Update receive rate in units of 64 * bytes/second */ |
9e8efc82 GR |
433 | hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; |
434 | hctx->ccid3hctx_x_recv <<= 6; | |
5c3fbb6a GR |
435 | |
436 | /* Update loss event rate */ | |
437 | pinv = opt_recv->ccid3or_loss_event_rate; | |
45393a66 | 438 | if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ |
5c3fbb6a | 439 | hctx->ccid3hctx_p = 0; |
45393a66 | 440 | else /* can not exceed 100% */ |
8109b02b | 441 | hctx->ccid3hctx_p = 1000000 / pinv; |
5c3fbb6a | 442 | |
b0e56780 | 443 | dccp_timestamp(sk, &now); |
5c3fbb6a GR |
444 | |
445 | /* | |
446 | * Calculate new round trip sample as per [RFC 3448, 4.3] by | |
8109b02b | 447 | * R_sample = (now - t_recvdata) - t_elapsed |
5c3fbb6a GR |
448 | */ |
449 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); | |
450 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; | |
451 | ||
0f9e5b57 GR |
452 | DCCP_BUG_ON(r_sample < 0); |
453 | if (unlikely(r_sample <= t_elapsed)) | |
1fba78b6 ACM |
454 | DCCP_WARN("WARNING: r_sample=%dus <= t_elapsed=%dus\n", |
455 | (int)r_sample, (int)t_elapsed); | |
1a28599a ACM |
456 | else |
457 | r_sample -= t_elapsed; | |
de553c18 | 458 | CCID3_RTT_SANITY_CHECK(r_sample); |
7c657876 | 459 | |
de553c18 | 460 | /* Update RTT estimate by |
7c657876 ACM |
461 | * If (No feedback recv) |
462 | * R = R_sample; | |
463 | * Else | |
464 | * R = q * R + (1 - q) * R_sample; | |
465 | * | |
466 | * q is a constant, RFC 3448 recomments 0.9 | |
467 | */ | |
468 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { | |
1a21e49a GR |
469 | /* |
470 | * Larger Initial Windows [RFC 4342, sec. 5] | |
1a21e49a | 471 | */ |
371fe777 GR |
472 | __u32 w_init = min(4 * dp->dccps_mss_cache, |
473 | max(2 * dp->dccps_mss_cache, 4380U)); | |
a79ef76f | 474 | hctx->ccid3hctx_rtt = r_sample; |
9e8efc82 | 475 | hctx->ccid3hctx_x = scaled_div(w_init << 6, r_sample); |
a79ef76f GR |
476 | hctx->ccid3hctx_t_ld = now; |
477 | ||
1266adee | 478 | ccid3_update_send_interval(hctx); |
7c657876 | 479 | |
371fe777 | 480 | ccid3_pr_debug("%s(%p), s=%u, MSS=%u, w_init=%u, " |
1fba78b6 | 481 | "R_sample=%dus, X=%u\n", dccp_role(sk), |
0f08461e | 482 | sk, hctx->ccid3hctx_s, |
371fe777 GR |
483 | dp->dccps_mss_cache, |
484 | w_init, | |
8109b02b | 485 | (int)r_sample, |
1a21e49a | 486 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
7c657876 | 487 | |
5c3fbb6a GR |
488 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); |
489 | } else { | |
490 | hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + | |
c9eaf173 | 491 | (u32)r_sample) / 10; |
7c657876 | 492 | |
ff586298 GR |
493 | /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ |
494 | if (hctx->ccid3hctx_p > 0) | |
495 | hctx->ccid3hctx_x_calc = | |
496 | tfrc_calc_x(hctx->ccid3hctx_s, | |
497 | hctx->ccid3hctx_rtt, | |
498 | hctx->ccid3hctx_p); | |
5c3fbb6a | 499 | ccid3_hc_tx_update_x(sk, &now); |
7c657876 | 500 | |
1fba78b6 | 501 | ccid3_pr_debug("%s(%p), RTT=%uus (sample=%dus), s=%u, " |
8109b02b ACM |
502 | "p=%u, X_calc=%u, X_recv=%u, X=%u\n", |
503 | dccp_role(sk), | |
1fba78b6 | 504 | sk, hctx->ccid3hctx_rtt, (int)r_sample, |
5c3fbb6a GR |
505 | hctx->ccid3hctx_s, hctx->ccid3hctx_p, |
506 | hctx->ccid3hctx_x_calc, | |
9e8efc82 | 507 | (unsigned)(hctx->ccid3hctx_x_recv >> 6), |
8109b02b | 508 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
7c657876 ACM |
509 | } |
510 | ||
511 | /* unschedule no feedback timer */ | |
512 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
513 | ||
7c657876 | 514 | /* remove all packets older than the one acked from history */ |
8c60f3fa ACM |
515 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
516 | &hctx->ccid3hctx_hist, packet); | |
c530cfb1 | 517 | /* |
8109b02b ACM |
518 | * As we have calculated new ipi, delta, t_nom it is possible |
519 | * that we now can send a packet, so wake up dccp_wait_for_ccid | |
c530cfb1 ACM |
520 | */ |
521 | sk->sk_write_space(sk); | |
8c60f3fa | 522 | |
8a508ac2 GR |
523 | /* |
524 | * Update timeout interval for the nofeedback timer. | |
525 | * We use a configuration option to increase the lower bound. | |
8109b02b ACM |
526 | * This can help avoid triggering the nofeedback timer too |
527 | * often ('spinning') on LANs with small RTTs. | |
8a508ac2 | 528 | */ |
5d0dbc4a | 529 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
8a508ac2 | 530 | CONFIG_IP_DCCP_CCID3_RTO * |
8109b02b | 531 | (USEC_PER_SEC/1000)); |
1f2333ae ACM |
532 | /* |
533 | * Schedule no feedback timer to expire in | |
8a508ac2 | 534 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
1f2333ae | 535 | */ |
8a508ac2 | 536 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
7c657876 | 537 | |
a9672411 | 538 | ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " |
8109b02b ACM |
539 | "expire in %lu jiffies (%luus)\n", |
540 | dccp_role(sk), | |
a9672411 GR |
541 | sk, usecs_to_jiffies(t_nfb), t_nfb); |
542 | ||
543 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
2a1fda6f | 544 | jiffies + usecs_to_jiffies(t_nfb)); |
7c657876 ACM |
545 | |
546 | /* set idle flag */ | |
bf58a381 | 547 | hctx->ccid3hctx_idle = 1; |
7c657876 | 548 | break; |
151a9931 | 549 | case TFRC_SSTATE_NO_SENT: /* fall through */ |
5e19e3fc | 550 | case TFRC_SSTATE_TERM: /* ignore feedback when closing */ |
7c657876 ACM |
551 | break; |
552 | } | |
553 | } | |
554 | ||
7c657876 | 555 | static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, |
1f2333ae ACM |
556 | unsigned char len, u16 idx, |
557 | unsigned char *value) | |
7c657876 ACM |
558 | { |
559 | int rc = 0; | |
59725dc2 ACM |
560 | const struct dccp_sock *dp = dccp_sk(sk); |
561 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 ACM |
562 | struct ccid3_options_received *opt_recv; |
563 | ||
59d203f9 | 564 | BUG_ON(hctx == NULL); |
7c657876 ACM |
565 | |
566 | opt_recv = &hctx->ccid3hctx_options_received; | |
567 | ||
568 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { | |
569 | opt_recv->ccid3or_seqno = dp->dccps_gsr; | |
570 | opt_recv->ccid3or_loss_event_rate = ~0; | |
571 | opt_recv->ccid3or_loss_intervals_idx = 0; | |
572 | opt_recv->ccid3or_loss_intervals_len = 0; | |
573 | opt_recv->ccid3or_receive_rate = 0; | |
574 | } | |
575 | ||
576 | switch (option) { | |
577 | case TFRC_OPT_LOSS_EVENT_RATE: | |
59d203f9 | 578 | if (unlikely(len != 4)) { |
a9672411 | 579 | DCCP_WARN("%s(%p), invalid len %d " |
59348b19 GR |
580 | "for TFRC_OPT_LOSS_EVENT_RATE\n", |
581 | dccp_role(sk), sk, len); | |
7c657876 ACM |
582 | rc = -EINVAL; |
583 | } else { | |
8109b02b ACM |
584 | opt_recv->ccid3or_loss_event_rate = |
585 | ntohl(*(__be32 *)value); | |
a9672411 | 586 | ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", |
7c657876 ACM |
587 | dccp_role(sk), sk, |
588 | opt_recv->ccid3or_loss_event_rate); | |
589 | } | |
590 | break; | |
591 | case TFRC_OPT_LOSS_INTERVALS: | |
592 | opt_recv->ccid3or_loss_intervals_idx = idx; | |
593 | opt_recv->ccid3or_loss_intervals_len = len; | |
a9672411 | 594 | ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n", |
7c657876 ACM |
595 | dccp_role(sk), sk, |
596 | opt_recv->ccid3or_loss_intervals_idx, | |
597 | opt_recv->ccid3or_loss_intervals_len); | |
598 | break; | |
599 | case TFRC_OPT_RECEIVE_RATE: | |
59d203f9 | 600 | if (unlikely(len != 4)) { |
a9672411 | 601 | DCCP_WARN("%s(%p), invalid len %d " |
59348b19 GR |
602 | "for TFRC_OPT_RECEIVE_RATE\n", |
603 | dccp_role(sk), sk, len); | |
7c657876 ACM |
604 | rc = -EINVAL; |
605 | } else { | |
8109b02b ACM |
606 | opt_recv->ccid3or_receive_rate = |
607 | ntohl(*(__be32 *)value); | |
a9672411 | 608 | ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", |
7c657876 ACM |
609 | dccp_role(sk), sk, |
610 | opt_recv->ccid3or_receive_rate); | |
611 | } | |
612 | break; | |
613 | } | |
614 | ||
615 | return rc; | |
616 | } | |
617 | ||
91f0ebf7 | 618 | static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) |
7c657876 | 619 | { |
91f0ebf7 | 620 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
7c657876 | 621 | |
78ad713d | 622 | hctx->ccid3hctx_s = 0; |
fe0499ae | 623 | hctx->ccid3hctx_rtt = 0; |
7c657876 ACM |
624 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
625 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); | |
aa5d7df3 | 626 | |
8109b02b ACM |
627 | hctx->ccid3hctx_no_feedback_timer.function = |
628 | ccid3_hc_tx_no_feedback_timer; | |
aa5d7df3 | 629 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; |
7c657876 ACM |
630 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
631 | ||
632 | return 0; | |
633 | } | |
634 | ||
635 | static void ccid3_hc_tx_exit(struct sock *sk) | |
636 | { | |
59725dc2 | 637 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 638 | |
7c657876 ACM |
639 | BUG_ON(hctx == NULL); |
640 | ||
641 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); | |
642 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
643 | ||
644 | /* Empty packet history */ | |
8c60f3fa | 645 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
7c657876 ACM |
646 | } |
647 | ||
9bf17475 GR |
648 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) |
649 | { | |
650 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
651 | ||
652 | /* Listen socks doesn't have a private CCID block */ | |
653 | if (sk->sk_state == DCCP_LISTEN) | |
654 | return; | |
655 | ||
656 | BUG_ON(hctx == NULL); | |
657 | ||
658 | info->tcpi_rto = hctx->ccid3hctx_t_rto; | |
659 | info->tcpi_rtt = hctx->ccid3hctx_rtt; | |
660 | } | |
661 | ||
662 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, | |
663 | u32 __user *optval, int __user *optlen) | |
664 | { | |
665 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
666 | const void *val; | |
667 | ||
668 | /* Listen socks doesn't have a private CCID block */ | |
669 | if (sk->sk_state == DCCP_LISTEN) | |
670 | return -EINVAL; | |
671 | ||
672 | switch (optname) { | |
673 | case DCCP_SOCKOPT_CCID_TX_INFO: | |
674 | if (len < sizeof(hctx->ccid3hctx_tfrc)) | |
675 | return -EINVAL; | |
676 | len = sizeof(hctx->ccid3hctx_tfrc); | |
677 | val = &hctx->ccid3hctx_tfrc; | |
678 | break; | |
679 | default: | |
680 | return -ENOPROTOOPT; | |
681 | } | |
682 | ||
683 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
684 | return -EFAULT; | |
685 | ||
686 | return 0; | |
687 | } | |
688 | ||
7c657876 | 689 | /* |
9bf17475 | 690 | * Receiver Half-Connection Routines |
7c657876 | 691 | */ |
56724aa4 | 692 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
693 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
694 | { | |
695 | static char *ccid3_rx_state_names[] = { | |
696 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", | |
697 | [TFRC_RSTATE_DATA] = "DATA", | |
698 | [TFRC_RSTATE_TERM] = "TERM", | |
699 | }; | |
700 | ||
701 | return ccid3_rx_state_names[state]; | |
702 | } | |
703 | #endif | |
704 | ||
c25a18ba ACM |
705 | static void ccid3_hc_rx_set_state(struct sock *sk, |
706 | enum ccid3_hc_rx_states state) | |
7c657876 | 707 | { |
59725dc2 | 708 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 ACM |
709 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
710 | ||
711 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
712 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
713 | ccid3_rx_state_name(state)); | |
7c657876 ACM |
714 | WARN_ON(state == oldstate); |
715 | hcrx->ccid3hcrx_state = state; | |
716 | } | |
717 | ||
78ad713d GR |
718 | static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) |
719 | { | |
720 | if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ | |
721 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); | |
722 | else | |
723 | hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : | |
724 | (9 * hcrx->ccid3hcrx_s + len) / 10; | |
725 | } | |
726 | ||
7c657876 ACM |
727 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
728 | { | |
59725dc2 | 729 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 730 | struct dccp_sock *dp = dccp_sk(sk); |
8c60f3fa | 731 | struct dccp_rx_hist_entry *packet; |
b6ee3d4a | 732 | struct timeval now; |
0f9e5b57 | 733 | suseconds_t delta; |
7c657876 | 734 | |
a9672411 | 735 | ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk), sk); |
7c657876 | 736 | |
b0e56780 | 737 | dccp_timestamp(sk, &now); |
b6ee3d4a | 738 | |
7c657876 ACM |
739 | switch (hcrx->ccid3hcrx_state) { |
740 | case TFRC_RSTATE_NO_DATA: | |
741 | hcrx->ccid3hcrx_x_recv = 0; | |
742 | break; | |
0f9e5b57 GR |
743 | case TFRC_RSTATE_DATA: |
744 | delta = timeval_delta(&now, | |
745 | &hcrx->ccid3hcrx_tstamp_last_feedback); | |
746 | DCCP_BUG_ON(delta < 0); | |
b9039a2a GR |
747 | hcrx->ccid3hcrx_x_recv = |
748 | scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); | |
7c657876 | 749 | break; |
59348b19 | 750 | case TFRC_RSTATE_TERM: |
a9672411 | 751 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
7c657876 ACM |
752 | return; |
753 | } | |
754 | ||
8c60f3fa | 755 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
59d203f9 | 756 | if (unlikely(packet == NULL)) { |
a9672411 | 757 | DCCP_WARN("%s(%p), no data packet in history!\n", |
59348b19 | 758 | dccp_role(sk), sk); |
7c657876 ACM |
759 | return; |
760 | } | |
761 | ||
b6ee3d4a | 762 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
66a377c5 | 763 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
7c657876 ACM |
764 | hcrx->ccid3hcrx_bytes_recv = 0; |
765 | ||
0f9e5b57 GR |
766 | /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */ |
767 | delta = timeval_delta(&now, &packet->dccphrx_tstamp); | |
768 | DCCP_BUG_ON(delta < 0); | |
769 | hcrx->ccid3hcrx_elapsed_time = delta / 10; | |
45393a66 | 770 | |
7c657876 | 771 | if (hcrx->ccid3hcrx_p == 0) |
45393a66 GR |
772 | hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ |
773 | else if (hcrx->ccid3hcrx_p > 1000000) { | |
774 | DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); | |
775 | hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ | |
776 | } else | |
7c657876 | 777 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; |
45393a66 | 778 | |
507d37cf | 779 | dp->dccps_hc_rx_insert_options = 1; |
7c657876 ACM |
780 | dccp_send_ack(sk); |
781 | } | |
782 | ||
2d0817d1 | 783 | static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 784 | { |
59d203f9 | 785 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
60fe62e7 | 786 | __be32 x_recv, pinv; |
7c657876 | 787 | |
59d203f9 ACM |
788 | BUG_ON(hcrx == NULL); |
789 | ||
790 | if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) | |
2d0817d1 | 791 | return 0; |
7c657876 | 792 | |
66a377c5 | 793 | DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; |
4fded33b ACM |
794 | |
795 | if (dccp_packet_without_ack(skb)) | |
2d0817d1 ACM |
796 | return 0; |
797 | ||
4fded33b ACM |
798 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
799 | pinv = htonl(hcrx->ccid3hcrx_pinv); | |
2d0817d1 ACM |
800 | |
801 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && | |
802 | dccp_insert_option_elapsed_time(sk, skb, | |
803 | hcrx->ccid3hcrx_elapsed_time)) || | |
804 | dccp_insert_option_timestamp(sk, skb) || | |
805 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, | |
8109b02b | 806 | &pinv, sizeof(pinv)) || |
2d0817d1 | 807 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, |
8109b02b | 808 | &x_recv, sizeof(x_recv))) |
2d0817d1 ACM |
809 | return -1; |
810 | ||
811 | return 0; | |
7c657876 ACM |
812 | } |
813 | ||
7c657876 ACM |
814 | /* calculate first loss interval |
815 | * | |
816 | * returns estimated loss interval in usecs */ | |
817 | ||
818 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) | |
819 | { | |
59725dc2 | 820 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
8c60f3fa | 821 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
0f9e5b57 GR |
822 | u32 x_recv, p; |
823 | suseconds_t rtt, delta; | |
b6ee3d4a | 824 | struct timeval tstamp = { 0, }; |
7c657876 ACM |
825 | int interval = 0; |
826 | int win_count = 0; | |
827 | int step = 0; | |
bfe24a6c | 828 | u64 fval; |
7c657876 | 829 | |
8c60f3fa ACM |
830 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
831 | dccphrx_node) { | |
832 | if (dccp_rx_hist_entry_data_packet(entry)) { | |
7c657876 ACM |
833 | tail = entry; |
834 | ||
835 | switch (step) { | |
836 | case 0: | |
8c60f3fa | 837 | tstamp = entry->dccphrx_tstamp; |
c1734376 | 838 | win_count = entry->dccphrx_ccval; |
7c657876 ACM |
839 | step = 1; |
840 | break; | |
841 | case 1: | |
c1734376 | 842 | interval = win_count - entry->dccphrx_ccval; |
7c657876 ACM |
843 | if (interval < 0) |
844 | interval += TFRC_WIN_COUNT_LIMIT; | |
845 | if (interval > 4) | |
846 | goto found; | |
847 | break; | |
848 | } | |
849 | } | |
850 | } | |
851 | ||
59d203f9 | 852 | if (unlikely(step == 0)) { |
a9672411 | 853 | DCCP_WARN("%s(%p), packet history has no data packets!\n", |
59348b19 | 854 | dccp_role(sk), sk); |
7c657876 ACM |
855 | return ~0; |
856 | } | |
857 | ||
59d203f9 | 858 | if (unlikely(interval == 0)) { |
a9672411 | 859 | DCCP_WARN("%s(%p), Could not find a win_count interval > 0." |
59348b19 | 860 | "Defaulting to 1\n", dccp_role(sk), sk); |
7c657876 ACM |
861 | interval = 1; |
862 | } | |
863 | found: | |
66a377c5 | 864 | if (!tail) { |
59348b19 | 865 | DCCP_CRIT("tail is null\n"); |
66a377c5 IM |
866 | return ~0; |
867 | } | |
0f9e5b57 GR |
868 | |
869 | delta = timeval_delta(&tstamp, &tail->dccphrx_tstamp); | |
870 | DCCP_BUG_ON(delta < 0); | |
871 | ||
872 | rtt = delta * 4 / interval; | |
1fba78b6 ACM |
873 | ccid3_pr_debug("%s(%p), approximated RTT to %dus\n", |
874 | dccp_role(sk), sk, (int)rtt); | |
59348b19 | 875 | |
bfe24a6c GR |
876 | /* |
877 | * Determine the length of the first loss interval via inverse lookup. | |
878 | * Assume that X_recv can be computed by the throughput equation | |
8109b02b ACM |
879 | * s |
880 | * X_recv = -------- | |
881 | * R * fval | |
bfe24a6c GR |
882 | * Find some p such that f(p) = fval; return 1/p [RFC 3448, 6.3.1]. |
883 | */ | |
884 | if (rtt == 0) { /* would result in divide-by-zero */ | |
832e3ca6 IM |
885 | DCCP_WARN("RTT==0\n"); |
886 | return ~0; | |
59348b19 | 887 | } |
7c657876 | 888 | |
b0e56780 ACM |
889 | dccp_timestamp(sk, &tstamp); |
890 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); | |
0f9e5b57 | 891 | DCCP_BUG_ON(delta <= 0); |
7c657876 | 892 | |
0f9e5b57 | 893 | x_recv = scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); |
bfe24a6c GR |
894 | if (x_recv == 0) { /* would also trigger divide-by-zero */ |
895 | DCCP_WARN("X_recv==0\n"); | |
896 | if ((x_recv = hcrx->ccid3hcrx_x_recv) == 0) { | |
897 | DCCP_BUG("stored value of X_recv is zero"); | |
832e3ca6 | 898 | return ~0; |
bfe24a6c | 899 | } |
66a377c5 IM |
900 | } |
901 | ||
bfe24a6c GR |
902 | fval = scaled_div(hcrx->ccid3hcrx_s, rtt); |
903 | fval = scaled_div32(fval, x_recv); | |
36729c1a | 904 | p = tfrc_calc_x_reverse_lookup(fval); |
bfe24a6c | 905 | |
a9672411 | 906 | ccid3_pr_debug("%s(%p), receive rate=%u bytes/s, implied " |
1f2333ae | 907 | "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); |
7c657876 ACM |
908 | |
909 | if (p == 0) | |
910 | return ~0; | |
911 | else | |
8109b02b | 912 | return 1000000 / p; |
7c657876 ACM |
913 | } |
914 | ||
915 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) | |
916 | { | |
59725dc2 | 917 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
fc747e82 | 918 | struct dccp_li_hist_entry *head; |
66a377c5 | 919 | u64 seq_temp; |
7c657876 | 920 | |
66a377c5 IM |
921 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
922 | if (!dccp_li_hist_interval_new(ccid3_li_hist, | |
923 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) | |
924 | return; | |
7c657876 | 925 | |
fc747e82 IM |
926 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
927 | struct dccp_li_hist_entry, dccplih_node); | |
928 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); | |
66a377c5 IM |
929 | } else { |
930 | struct dccp_li_hist_entry *entry; | |
931 | struct list_head *tail; | |
932 | ||
fc747e82 IM |
933 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
934 | struct dccp_li_hist_entry, dccplih_node); | |
66a377c5 IM |
935 | /* FIXME win count check removed as was wrong */ |
936 | /* should make this check with receive history */ | |
937 | /* and compare there as per section 10.2 of RFC4342 */ | |
938 | ||
939 | /* new loss event detected */ | |
940 | /* calculate last interval length */ | |
941 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); | |
54e6ecb2 | 942 | entry = dccp_li_hist_entry_new(ccid3_li_hist, GFP_ATOMIC); |
66a377c5 IM |
943 | |
944 | if (entry == NULL) { | |
59348b19 | 945 | DCCP_BUG("out of memory - can not allocate entry"); |
ae6706f0 | 946 | return; |
66a377c5 IM |
947 | } |
948 | ||
949 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); | |
950 | ||
951 | tail = hcrx->ccid3hcrx_li_hist.prev; | |
952 | list_del(tail); | |
953 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); | |
954 | ||
955 | /* Create the newest interval */ | |
956 | entry->dccplih_seqno = seq_loss; | |
957 | entry->dccplih_interval = seq_temp; | |
958 | entry->dccplih_win_count = win_loss; | |
959 | } | |
7c657876 ACM |
960 | } |
961 | ||
66a377c5 | 962 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
c9eaf173 | 963 | struct dccp_rx_hist_entry *packet) |
7c657876 | 964 | { |
59725dc2 | 965 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
8109b02b ACM |
966 | struct dccp_rx_hist_entry *rx_hist = |
967 | dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); | |
66a377c5 IM |
968 | u64 seqno = packet->dccphrx_seqno; |
969 | u64 tmp_seqno; | |
970 | int loss = 0; | |
971 | u8 ccval; | |
972 | ||
973 | ||
974 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
975 | ||
976 | if (!rx_hist || | |
977 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
978 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
979 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
980 | goto detect_out; | |
981 | } | |
982 | ||
7c657876 | 983 | |
66a377c5 IM |
984 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
985 | > TFRC_RECV_NUM_LATE_LOSS) { | |
986 | loss = 1; | |
987 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, | |
988 | hcrx->ccid3hcrx_ccval_nonloss); | |
989 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
990 | dccp_inc_seqno(&tmp_seqno); | |
991 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
992 | dccp_inc_seqno(&tmp_seqno); | |
993 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, | |
994 | tmp_seqno, &ccval)) { | |
8109b02b | 995 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
66a377c5 IM |
996 | hcrx->ccid3hcrx_ccval_nonloss = ccval; |
997 | dccp_inc_seqno(&tmp_seqno); | |
998 | } | |
999 | } | |
1000 | ||
1001 | /* FIXME - this code could be simplified with above while */ | |
1002 | /* but works at moment */ | |
1003 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
1004 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
1005 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
1006 | } | |
1007 | ||
1008 | detect_out: | |
1009 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, | |
1010 | &hcrx->ccid3hcrx_li_hist, packet, | |
1011 | hcrx->ccid3hcrx_seqno_nonloss); | |
1012 | return loss; | |
7c657876 ACM |
1013 | } |
1014 | ||
7c657876 ACM |
1015 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
1016 | { | |
59725dc2 | 1017 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
4fded33b | 1018 | const struct dccp_options_received *opt_recv; |
8c60f3fa | 1019 | struct dccp_rx_hist_entry *packet; |
7c657876 | 1020 | struct timeval now; |
0f9e5b57 GR |
1021 | u32 p_prev, rtt_prev; |
1022 | suseconds_t r_sample, t_elapsed; | |
78ad713d | 1023 | int loss, payload_size; |
1f2333ae | 1024 | |
59348b19 | 1025 | BUG_ON(hcrx == NULL); |
7c657876 | 1026 | |
59725dc2 | 1027 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
4fded33b | 1028 | |
7c657876 ACM |
1029 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
1030 | case DCCP_PKT_ACK: | |
1031 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
1032 | return; | |
1033 | case DCCP_PKT_DATAACK: | |
4fded33b | 1034 | if (opt_recv->dccpor_timestamp_echo == 0) |
7c657876 | 1035 | break; |
66a377c5 | 1036 | rtt_prev = hcrx->ccid3hcrx_rtt; |
b0e56780 | 1037 | dccp_timestamp(sk, &now); |
b3a3077d ACM |
1038 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
1039 | r_sample = timeval_usecs(&now); | |
1040 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; | |
1041 | ||
0f9e5b57 | 1042 | DCCP_BUG_ON(r_sample < 0); |
b3a3077d | 1043 | if (unlikely(r_sample <= t_elapsed)) |
0f9e5b57 | 1044 | DCCP_WARN("r_sample=%ldus, t_elapsed=%ldus\n", |
0f08461e | 1045 | (long)r_sample, (long)t_elapsed); |
b3a3077d ACM |
1046 | else |
1047 | r_sample -= t_elapsed; | |
de553c18 | 1048 | CCID3_RTT_SANITY_CHECK(r_sample); |
b3a3077d ACM |
1049 | |
1050 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
1051 | hcrx->ccid3hcrx_rtt = r_sample; | |
1052 | else | |
1053 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + | |
1054 | r_sample / 10; | |
1055 | ||
66a377c5 | 1056 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
a9672411 GR |
1057 | ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n", |
1058 | dccp_role(sk), sk, hcrx->ccid3hcrx_rtt, | |
4fded33b | 1059 | opt_recv->dccpor_elapsed_time); |
7c657876 ACM |
1060 | break; |
1061 | case DCCP_PKT_DATA: | |
1062 | break; | |
59d203f9 | 1063 | default: /* We're not interested in other packet types, move along */ |
7c657876 ACM |
1064 | return; |
1065 | } | |
1066 | ||
b0e56780 | 1067 | packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, |
54e6ecb2 | 1068 | skb, GFP_ATOMIC); |
59d203f9 | 1069 | if (unlikely(packet == NULL)) { |
a9672411 | 1070 | DCCP_WARN("%s(%p), Not enough mem to add rx packet " |
59348b19 | 1071 | "to history, consider it lost!\n", dccp_role(sk), sk); |
7c657876 ACM |
1072 | return; |
1073 | } | |
1074 | ||
66a377c5 | 1075 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
7c657876 ACM |
1076 | |
1077 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) | |
1078 | return; | |
1079 | ||
78ad713d GR |
1080 | payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; |
1081 | ccid3_hc_rx_update_s(hcrx, payload_size); | |
1082 | ||
7c657876 ACM |
1083 | switch (hcrx->ccid3hcrx_state) { |
1084 | case TFRC_RSTATE_NO_DATA: | |
a9672411 GR |
1085 | ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial " |
1086 | "feedback\n", dccp_role(sk), sk, | |
1f2333ae | 1087 | dccp_state_name(sk->sk_state), skb); |
7c657876 ACM |
1088 | ccid3_hc_rx_send_feedback(sk); |
1089 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); | |
1090 | return; | |
1091 | case TFRC_RSTATE_DATA: | |
78ad713d | 1092 | hcrx->ccid3hcrx_bytes_recv += payload_size; |
66a377c5 | 1093 | if (loss) |
b6ee3d4a ACM |
1094 | break; |
1095 | ||
b0e56780 | 1096 | dccp_timestamp(sk, &now); |
8109b02b ACM |
1097 | if ((timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) - |
1098 | (suseconds_t)hcrx->ccid3hcrx_rtt) >= 0) { | |
b6ee3d4a ACM |
1099 | hcrx->ccid3hcrx_tstamp_last_ack = now; |
1100 | ccid3_hc_rx_send_feedback(sk); | |
7c657876 | 1101 | } |
b6ee3d4a | 1102 | return; |
59348b19 | 1103 | case TFRC_RSTATE_TERM: |
a9672411 | 1104 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
7c657876 ACM |
1105 | return; |
1106 | } | |
1107 | ||
1108 | /* Dealing with packet loss */ | |
a9672411 | 1109 | ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n", |
4fded33b | 1110 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); |
7c657876 | 1111 | |
7c657876 | 1112 | p_prev = hcrx->ccid3hcrx_p; |
c9eaf173 | 1113 | |
7c657876 | 1114 | /* Calculate loss event rate */ |
c0996660 IM |
1115 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
1116 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); | |
1117 | ||
7c657876 | 1118 | /* Scaling up by 1000000 as fixed decimal */ |
c0996660 IM |
1119 | if (i_mean != 0) |
1120 | hcrx->ccid3hcrx_p = 1000000 / i_mean; | |
59348b19 GR |
1121 | } else |
1122 | DCCP_BUG("empty loss history"); | |
7c657876 ACM |
1123 | |
1124 | if (hcrx->ccid3hcrx_p > p_prev) { | |
1125 | ccid3_hc_rx_send_feedback(sk); | |
1126 | return; | |
1127 | } | |
1128 | } | |
1129 | ||
91f0ebf7 | 1130 | static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) |
7c657876 | 1131 | { |
91f0ebf7 | 1132 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
7c657876 | 1133 | |
a9672411 | 1134 | ccid3_pr_debug("entry\n"); |
7c657876 | 1135 | |
7c657876 ACM |
1136 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; |
1137 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); | |
ae6706f0 | 1138 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
b0e56780 | 1139 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
954ee31f | 1140 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
78ad713d | 1141 | hcrx->ccid3hcrx_s = 0; |
fe0499ae | 1142 | hcrx->ccid3hcrx_rtt = 0; |
7c657876 ACM |
1143 | return 0; |
1144 | } | |
1145 | ||
1146 | static void ccid3_hc_rx_exit(struct sock *sk) | |
1147 | { | |
59725dc2 | 1148 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 1149 | |
59d203f9 | 1150 | BUG_ON(hcrx == NULL); |
7c657876 ACM |
1151 | |
1152 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); | |
1153 | ||
1154 | /* Empty packet history */ | |
8c60f3fa | 1155 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
7c657876 ACM |
1156 | |
1157 | /* Empty loss interval history */ | |
ae6706f0 | 1158 | dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); |
7c657876 ACM |
1159 | } |
1160 | ||
2babe1f6 ACM |
1161 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
1162 | { | |
59725dc2 | 1163 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
2babe1f6 | 1164 | |
59c2353d ACM |
1165 | /* Listen socks doesn't have a private CCID block */ |
1166 | if (sk->sk_state == DCCP_LISTEN) | |
1167 | return; | |
1168 | ||
59d203f9 | 1169 | BUG_ON(hcrx == NULL); |
2babe1f6 | 1170 | |
8109b02b ACM |
1171 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; |
1172 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; | |
1173 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; | |
2babe1f6 ACM |
1174 | } |
1175 | ||
88f964db ACM |
1176 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
1177 | u32 __user *optval, int __user *optlen) | |
1178 | { | |
1179 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); | |
1180 | const void *val; | |
c9eaf173 | 1181 | |
88f964db ACM |
1182 | /* Listen socks doesn't have a private CCID block */ |
1183 | if (sk->sk_state == DCCP_LISTEN) | |
1184 | return -EINVAL; | |
1185 | ||
1186 | switch (optname) { | |
1187 | case DCCP_SOCKOPT_CCID_RX_INFO: | |
1188 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) | |
1189 | return -EINVAL; | |
1190 | len = sizeof(hcrx->ccid3hcrx_tfrc); | |
1191 | val = &hcrx->ccid3hcrx_tfrc; | |
1192 | break; | |
1193 | default: | |
1194 | return -ENOPROTOOPT; | |
1195 | } | |
1196 | ||
1197 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1198 | return -EFAULT; | |
1199 | ||
1200 | return 0; | |
1201 | } | |
1202 | ||
91f0ebf7 | 1203 | static struct ccid_operations ccid3 = { |
3dd9a7c3 | 1204 | .ccid_id = DCCPC_CCID3, |
7c657876 ACM |
1205 | .ccid_name = "ccid3", |
1206 | .ccid_owner = THIS_MODULE, | |
91f0ebf7 | 1207 | .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), |
7c657876 ACM |
1208 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
1209 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, | |
1210 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, | |
1211 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, | |
1212 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, | |
7c657876 | 1213 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, |
91f0ebf7 | 1214 | .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), |
7c657876 ACM |
1215 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
1216 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, | |
1217 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, | |
1218 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, | |
2babe1f6 ACM |
1219 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
1220 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, | |
88f964db ACM |
1221 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
1222 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, | |
7c657876 | 1223 | }; |
8109b02b | 1224 | |
56724aa4 | 1225 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
1226 | module_param(ccid3_debug, int, 0444); |
1227 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); | |
56724aa4 | 1228 | #endif |
7c657876 ACM |
1229 | |
1230 | static __init int ccid3_module_init(void) | |
1231 | { | |
8c60f3fa | 1232 | int rc = -ENOBUFS; |
7c657876 | 1233 | |
8c60f3fa ACM |
1234 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
1235 | if (ccid3_rx_hist == NULL) | |
7c657876 ACM |
1236 | goto out; |
1237 | ||
8c60f3fa ACM |
1238 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
1239 | if (ccid3_tx_hist == NULL) | |
1240 | goto out_free_rx; | |
7c657876 | 1241 | |
ae6706f0 ACM |
1242 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
1243 | if (ccid3_li_hist == NULL) | |
8c60f3fa | 1244 | goto out_free_tx; |
7c657876 ACM |
1245 | |
1246 | rc = ccid_register(&ccid3); | |
8109b02b | 1247 | if (rc != 0) |
7c657876 | 1248 | goto out_free_loss_interval_history; |
7c657876 ACM |
1249 | out: |
1250 | return rc; | |
8c60f3fa | 1251 | |
7c657876 | 1252 | out_free_loss_interval_history: |
ae6706f0 ACM |
1253 | dccp_li_hist_delete(ccid3_li_hist); |
1254 | ccid3_li_hist = NULL; | |
8c60f3fa ACM |
1255 | out_free_tx: |
1256 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1257 | ccid3_tx_hist = NULL; | |
1258 | out_free_rx: | |
1259 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1260 | ccid3_rx_hist = NULL; | |
7c657876 ACM |
1261 | goto out; |
1262 | } | |
1263 | module_init(ccid3_module_init); | |
1264 | ||
1265 | static __exit void ccid3_module_exit(void) | |
1266 | { | |
1267 | ccid_unregister(&ccid3); | |
1268 | ||
8c60f3fa ACM |
1269 | if (ccid3_tx_hist != NULL) { |
1270 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1271 | ccid3_tx_hist = NULL; | |
7c657876 | 1272 | } |
8c60f3fa ACM |
1273 | if (ccid3_rx_hist != NULL) { |
1274 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1275 | ccid3_rx_hist = NULL; | |
7c657876 | 1276 | } |
ae6706f0 ACM |
1277 | if (ccid3_li_hist != NULL) { |
1278 | dccp_li_hist_delete(ccid3_li_hist); | |
1279 | ccid3_li_hist = NULL; | |
7c657876 ACM |
1280 | } |
1281 | } | |
1282 | module_exit(ccid3_module_exit); | |
1283 | ||
e6bccd35 | 1284 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
1f2333ae | 1285 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
7c657876 ACM |
1286 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
1287 | MODULE_LICENSE("GPL"); | |
1288 | MODULE_ALIAS("net-dccp-ccid-3"); |