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 GR |
125 | |
126 | hctx->ccid3hctx_x = min_t(u64, hctx->ccid3hctx_x_calc << 6, | |
127 | hctx->ccid3hctx_x_recv * 2 ); | |
128 | hctx->ccid3hctx_x = max_t(u64, hctx->ccid3hctx_x, | |
129 | (hctx->ccid3hctx_s << 6)/TFRC_T_MBI); | |
a79ef76f | 130 | |
0f9e5b57 GR |
131 | } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) - |
132 | (suseconds_t)hctx->ccid3hctx_rtt >= 0 ) { | |
1a21e49a GR |
133 | |
134 | hctx->ccid3hctx_x = max(2 * min(hctx->ccid3hctx_x, | |
135 | hctx->ccid3hctx_x_recv), | |
136 | scaled_div(hctx->ccid3hctx_s << 6, | |
137 | hctx->ccid3hctx_rtt )); | |
a79ef76f | 138 | hctx->ccid3hctx_t_ld = *now; |
ff586298 | 139 | } |
b6ee3d4a | 140 | |
17893bc1 GR |
141 | if (hctx->ccid3hctx_x != old_x) |
142 | ccid3_update_send_time(hctx); | |
7c657876 ACM |
143 | } |
144 | ||
78ad713d GR |
145 | /* |
146 | * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) | |
147 | * @len: DCCP packet payload size in bytes | |
148 | */ | |
149 | static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) | |
150 | { | |
151 | if (unlikely(len == 0)) | |
152 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); | |
153 | else | |
154 | hctx->ccid3hctx_s = hctx->ccid3hctx_s == 0 ? len : | |
155 | (9 * hctx->ccid3hctx_s + len) / 10; | |
156 | /* | |
157 | * Note: We could do a potential optimisation here - when `s' changes, | |
158 | * recalculate sending rate and consequently t_ipi, t_delta, and | |
159 | * t_now. This is however non-standard, and the benefits are not | |
160 | * clear, so it is currently left out. | |
161 | */ | |
162 | } | |
163 | ||
9f8681db GR |
164 | /* |
165 | * Update Window Counter using the algorithm from [RFC 4342, 8.1]. | |
166 | * The algorithm is not applicable if RTT < 4 microseconds. | |
167 | */ | |
168 | static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, | |
169 | struct timeval *now) | |
170 | { | |
171 | suseconds_t delta; | |
172 | u32 quarter_rtts; | |
173 | ||
174 | if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ | |
175 | return; | |
176 | ||
177 | delta = timeval_delta(now, &hctx->ccid3hctx_t_last_win_count); | |
178 | DCCP_BUG_ON(delta < 0); | |
179 | ||
180 | quarter_rtts = (u32)delta / (hctx->ccid3hctx_rtt / 4); | |
181 | ||
182 | if (quarter_rtts > 0) { | |
183 | hctx->ccid3hctx_t_last_win_count = *now; | |
184 | hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); | |
185 | hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ | |
186 | ||
187 | ccid3_pr_debug("now at %#X\n", hctx->ccid3hctx_last_win_count); | |
188 | } | |
189 | } | |
190 | ||
7c657876 ACM |
191 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) |
192 | { | |
193 | struct sock *sk = (struct sock *)data; | |
59725dc2 | 194 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
2a1fda6f | 195 | unsigned long t_nfb = USEC_PER_SEC / 5; |
7c657876 ACM |
196 | |
197 | bh_lock_sock(sk); | |
198 | if (sock_owned_by_user(sk)) { | |
199 | /* Try again later. */ | |
200 | /* XXX: set some sensible MIB */ | |
48e03eee | 201 | goto restart_timer; |
7c657876 ACM |
202 | } |
203 | ||
204 | ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, | |
205 | ccid3_tx_state_name(hctx->ccid3hctx_state)); | |
206 | ||
7c657876 | 207 | switch (hctx->ccid3hctx_state) { |
7c657876 | 208 | case TFRC_SSTATE_NO_FBACK: |
a79ef76f | 209 | /* RFC 3448, 4.4: Halve send rate directly */ |
179ebc9f | 210 | hctx->ccid3hctx_x = max_t(u32, hctx->ccid3hctx_x / 2, |
1a21e49a | 211 | (hctx->ccid3hctx_s << 6)/TFRC_T_MBI); |
7c657876 | 212 | |
1a21e49a | 213 | ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %u " |
1f2333ae ACM |
214 | "bytes/s\n", |
215 | dccp_role(sk), sk, | |
216 | ccid3_tx_state_name(hctx->ccid3hctx_state), | |
1a21e49a | 217 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
48e03eee GR |
218 | /* The value of R is still undefined and so we can not recompute |
219 | * the timout value. Keep initial value as per [RFC 4342, 5]. */ | |
2a1fda6f | 220 | t_nfb = TFRC_INITIAL_TIMEOUT; |
17893bc1 | 221 | ccid3_update_send_time(hctx); |
7c657876 ACM |
222 | break; |
223 | case TFRC_SSTATE_FBACK: | |
1f2333ae ACM |
224 | /* |
225 | * Check if IDLE since last timeout and recv rate is less than | |
1a21e49a | 226 | * 4 packets (in units of 64*bytes/sec) per RTT |
1f2333ae | 227 | */ |
1f2333ae | 228 | if (!hctx->ccid3hctx_idle || |
1a21e49a GR |
229 | (hctx->ccid3hctx_x_recv >= 4 * |
230 | scaled_div(hctx->ccid3hctx_s << 6, hctx->ccid3hctx_rtt))) { | |
a79ef76f GR |
231 | struct timeval now; |
232 | ||
1f2333ae ACM |
233 | ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", |
234 | dccp_role(sk), sk, | |
7c657876 | 235 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
7c657876 | 236 | |
ff586298 GR |
237 | /* |
238 | * Modify the cached value of X_recv [RFC 3448, 4.4] | |
239 | * | |
240 | * If (p == 0 || X_calc > 2 * X_recv) | |
7c657876 ACM |
241 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); |
242 | * Else | |
243 | * X_recv = X_calc / 4; | |
1a21e49a GR |
244 | * |
245 | * Note that X_recv is scaled by 2^6 while X_calc is not | |
7c657876 | 246 | */ |
44158306 | 247 | BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); |
7c657876 | 248 | |
44158306 | 249 | if (hctx->ccid3hctx_p == 0 || |
1a21e49a GR |
250 | hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5)) { |
251 | ||
252 | hctx->ccid3hctx_x_recv = | |
253 | max_t(u64, hctx->ccid3hctx_x_recv / 2, | |
254 | (hctx->ccid3hctx_s << 6) / | |
255 | (2*TFRC_T_MBI)); | |
256 | ||
ff586298 GR |
257 | if (hctx->ccid3hctx_p == 0) |
258 | dccp_timestamp(sk, &now); | |
259 | } else | |
1a21e49a | 260 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc << 4; |
7c657876 | 261 | |
ff586298 | 262 | /* Now recalculate X [RFC 3448, 4.3, step (4)] */ |
a79ef76f | 263 | ccid3_hc_tx_update_x(sk, &now); |
7c657876 | 264 | } |
6b5e633a ACM |
265 | /* |
266 | * Schedule no feedback timer to expire in | |
8a508ac2 GR |
267 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
268 | * See comments in packet_recv() regarding the value of t_RTO. | |
6b5e633a | 269 | */ |
8a508ac2 | 270 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
7c657876 | 271 | break; |
59348b19 GR |
272 | case TFRC_SSTATE_NO_SENT: |
273 | DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); | |
274 | /* fall through */ | |
275 | case TFRC_SSTATE_TERM: | |
7c657876 ACM |
276 | goto out; |
277 | } | |
278 | ||
7c657876 | 279 | hctx->ccid3hctx_idle = 1; |
48e03eee GR |
280 | |
281 | restart_timer: | |
282 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
2a1fda6f | 283 | jiffies + usecs_to_jiffies(t_nfb)); |
7c657876 ACM |
284 | out: |
285 | bh_unlock_sock(sk); | |
286 | sock_put(sk); | |
287 | } | |
288 | ||
7da7f456 GR |
289 | /* |
290 | * returns | |
291 | * > 0: delay (in msecs) that should pass before actually sending | |
292 | * = 0: can send immediately | |
293 | * < 0: error condition; do not send packet | |
294 | */ | |
6b57c93d | 295 | static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
296 | { |
297 | struct dccp_sock *dp = dccp_sk(sk); | |
59725dc2 | 298 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 299 | struct timeval now; |
0f9e5b57 | 300 | suseconds_t delay; |
7c657876 | 301 | |
59348b19 | 302 | BUG_ON(hctx == NULL); |
1f2333ae | 303 | |
7c657876 | 304 | /* |
da335baf GR |
305 | * This function is called only for Data and DataAck packets. Sending |
306 | * zero-sized Data(Ack)s is theoretically possible, but for congestion | |
307 | * control this case is pathological - ignore it. | |
7c657876 | 308 | */ |
6b57c93d | 309 | if (unlikely(skb->len == 0)) |
da335baf | 310 | return -EBADMSG; |
7c657876 | 311 | |
b0e56780 | 312 | dccp_timestamp(sk, &now); |
7c657876 ACM |
313 | |
314 | switch (hctx->ccid3hctx_state) { | |
315 | case TFRC_SSTATE_NO_SENT: | |
1f2333ae ACM |
316 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
317 | jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); | |
7c657876 ACM |
318 | hctx->ccid3hctx_last_win_count = 0; |
319 | hctx->ccid3hctx_t_last_win_count = now; | |
320 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); | |
7c657876 | 321 | |
1a21e49a | 322 | /* Set initial sending rate X/s to 1pps (X is scaled by 2^6) */ |
6b57c93d | 323 | ccid3_hc_tx_update_s(hctx, skb->len); |
1a21e49a | 324 | hctx->ccid3hctx_x = hctx->ccid3hctx_s << 6; |
78ad713d | 325 | |
90feeb95 GR |
326 | /* First timeout, according to [RFC 3448, 4.2], is 1 second */ |
327 | hctx->ccid3hctx_t_ipi = USEC_PER_SEC; | |
328 | /* Initial delta: minimum of 0.5 sec and t_gran/2 */ | |
329 | hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; | |
330 | ||
331 | /* Set t_0 for initial packet */ | |
7c657876 | 332 | hctx->ccid3hctx_t_nom = now; |
7c657876 ACM |
333 | break; |
334 | case TFRC_SSTATE_NO_FBACK: | |
335 | case TFRC_SSTATE_FBACK: | |
91cf5a17 GR |
336 | delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); |
337 | /* | |
338 | * Scheduling of packet transmissions [RFC 3448, 4.6] | |
339 | * | |
340 | * if (t_now > t_nom - delta) | |
341 | * // send the packet now | |
342 | * else | |
343 | * // send the packet in (t_nom - t_now) milliseconds. | |
344 | */ | |
0f9e5b57 | 345 | if (delay - (suseconds_t)hctx->ccid3hctx_delta >= 0) |
7da7f456 | 346 | return delay / 1000L; |
9f8681db GR |
347 | |
348 | ccid3_hc_tx_update_win_count(hctx, &now); | |
7c657876 | 349 | break; |
59348b19 GR |
350 | case TFRC_SSTATE_TERM: |
351 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7da7f456 | 352 | return -EINVAL; |
7c657876 ACM |
353 | } |
354 | ||
7da7f456 GR |
355 | /* prepare to send now (add options etc.) */ |
356 | dp->dccps_hc_tx_insert_options = 1; | |
e312d100 GR |
357 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; |
358 | ||
359 | /* set the nominal send time for the next following packet */ | |
7da7f456 GR |
360 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
361 | ||
362 | return 0; | |
7c657876 ACM |
363 | } |
364 | ||
6b57c93d | 365 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len) |
7c657876 | 366 | { |
59725dc2 | 367 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 368 | struct timeval now; |
6b57c93d | 369 | struct dccp_tx_hist_entry *packet; |
7c657876 | 370 | |
59348b19 | 371 | BUG_ON(hctx == NULL); |
7c657876 | 372 | |
6b57c93d | 373 | ccid3_hc_tx_update_s(hctx, len); |
7c657876 | 374 | |
c5a1ae9a | 375 | packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC); |
6b57c93d | 376 | if (unlikely(packet == NULL)) { |
c5a1ae9a | 377 | DCCP_CRIT("packet history - out of memory!"); |
6b57c93d GR |
378 | return; |
379 | } | |
c5a1ae9a GR |
380 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, packet); |
381 | ||
382 | dccp_timestamp(sk, &now); | |
6b57c93d | 383 | packet->dccphtx_tstamp = now; |
c5a1ae9a GR |
384 | packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss; |
385 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; | |
386 | packet->dccphtx_sent = 1; | |
387 | hctx->ccid3hctx_idle = 0; | |
7c657876 ACM |
388 | } |
389 | ||
390 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) | |
391 | { | |
59725dc2 ACM |
392 | const struct dccp_sock *dp = dccp_sk(sk); |
393 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 | 394 | struct ccid3_options_received *opt_recv; |
8c60f3fa | 395 | struct dccp_tx_hist_entry *packet; |
b0e56780 | 396 | struct timeval now; |
2a1fda6f | 397 | unsigned long t_nfb; |
7c657876 | 398 | u32 pinv; |
5c3fbb6a | 399 | long r_sample, t_elapsed; |
1f2333ae | 400 | |
59348b19 | 401 | BUG_ON(hctx == NULL); |
7c657876 ACM |
402 | |
403 | /* we are only interested in ACKs */ | |
404 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || | |
405 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) | |
406 | return; | |
407 | ||
408 | opt_recv = &hctx->ccid3hctx_options_received; | |
409 | ||
7c657876 | 410 | switch (hctx->ccid3hctx_state) { |
7c657876 ACM |
411 | case TFRC_SSTATE_NO_FBACK: |
412 | case TFRC_SSTATE_FBACK: | |
5c3fbb6a | 413 | /* get packet from history to look up t_recvdata */ |
8c60f3fa ACM |
414 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
415 | DCCP_SKB_CB(skb)->dccpd_ack_seq); | |
59d203f9 | 416 | if (unlikely(packet == NULL)) { |
5c3fbb6a | 417 | DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " |
59348b19 | 418 | "in history!\n", dccp_role(sk), sk, |
59d203f9 | 419 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
59348b19 | 420 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
7c657876 ACM |
421 | return; |
422 | } | |
423 | ||
1a21e49a GR |
424 | /* Update receive rate in units of 64 * bytes/second */ |
425 | hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate << 6; | |
5c3fbb6a GR |
426 | |
427 | /* Update loss event rate */ | |
428 | pinv = opt_recv->ccid3or_loss_event_rate; | |
45393a66 | 429 | if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ |
5c3fbb6a | 430 | hctx->ccid3hctx_p = 0; |
45393a66 | 431 | else /* can not exceed 100% */ |
44158306 | 432 | hctx->ccid3hctx_p = 1000000 / pinv; |
5c3fbb6a | 433 | |
b0e56780 | 434 | dccp_timestamp(sk, &now); |
5c3fbb6a GR |
435 | |
436 | /* | |
437 | * Calculate new round trip sample as per [RFC 3448, 4.3] by | |
438 | * R_sample = (now - t_recvdata) - t_elapsed | |
439 | */ | |
440 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); | |
441 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; | |
442 | ||
0f9e5b57 GR |
443 | DCCP_BUG_ON(r_sample < 0); |
444 | if (unlikely(r_sample <= t_elapsed)) | |
5c3fbb6a | 445 | DCCP_WARN("WARNING: r_sample=%ldus <= t_elapsed=%ldus\n", |
59348b19 | 446 | r_sample, t_elapsed); |
1a28599a ACM |
447 | else |
448 | r_sample -= t_elapsed; | |
de553c18 | 449 | CCID3_RTT_SANITY_CHECK(r_sample); |
7c657876 | 450 | |
de553c18 | 451 | /* Update RTT estimate by |
7c657876 ACM |
452 | * If (No feedback recv) |
453 | * R = R_sample; | |
454 | * Else | |
455 | * R = q * R + (1 - q) * R_sample; | |
456 | * | |
457 | * q is a constant, RFC 3448 recomments 0.9 | |
458 | */ | |
459 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { | |
1a21e49a GR |
460 | /* |
461 | * Larger Initial Windows [RFC 4342, sec. 5] | |
462 | * We deviate in that we use `s' instead of `MSS'. | |
463 | */ | |
179ebc9f | 464 | u16 w_init = min( 4 * hctx->ccid3hctx_s, |
a79ef76f GR |
465 | max(2 * hctx->ccid3hctx_s, 4380)); |
466 | hctx->ccid3hctx_rtt = r_sample; | |
1a21e49a | 467 | hctx->ccid3hctx_x = scaled_div(w_init<< 6, r_sample); |
a79ef76f GR |
468 | hctx->ccid3hctx_t_ld = now; |
469 | ||
470 | ccid3_update_send_time(hctx); | |
7c657876 | 471 | |
5c3fbb6a GR |
472 | ccid3_pr_debug("%s(%p), s=%u, w_init=%u, " |
473 | "R_sample=%ldus, X=%u\n", dccp_role(sk), | |
474 | sk, hctx->ccid3hctx_s, w_init, r_sample, | |
1a21e49a | 475 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
7c657876 | 476 | |
5c3fbb6a GR |
477 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); |
478 | } else { | |
479 | hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + | |
480 | (u32)r_sample ) / 10; | |
7c657876 | 481 | |
ff586298 GR |
482 | /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ |
483 | if (hctx->ccid3hctx_p > 0) | |
484 | hctx->ccid3hctx_x_calc = | |
485 | tfrc_calc_x(hctx->ccid3hctx_s, | |
486 | hctx->ccid3hctx_rtt, | |
487 | hctx->ccid3hctx_p); | |
5c3fbb6a | 488 | ccid3_hc_tx_update_x(sk, &now); |
7c657876 | 489 | |
5c3fbb6a GR |
490 | ccid3_pr_debug("%s(%p), RTT=%uus (sample=%ldus), s=%u, " |
491 | "p=%u, X_calc=%u, X=%u\n", dccp_role(sk), | |
492 | sk, hctx->ccid3hctx_rtt, r_sample, | |
493 | hctx->ccid3hctx_s, hctx->ccid3hctx_p, | |
494 | hctx->ccid3hctx_x_calc, | |
1a21e49a | 495 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
7c657876 ACM |
496 | } |
497 | ||
498 | /* unschedule no feedback timer */ | |
499 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
500 | ||
7c657876 | 501 | /* remove all packets older than the one acked from history */ |
8c60f3fa ACM |
502 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
503 | &hctx->ccid3hctx_hist, packet); | |
c530cfb1 ACM |
504 | /* |
505 | * As we have calculated new ipi, delta, t_nom it is possible that | |
5d0dbc4a | 506 | * we now can send a packet, so wake up dccp_wait_for_ccid |
c530cfb1 ACM |
507 | */ |
508 | sk->sk_write_space(sk); | |
8c60f3fa | 509 | |
8a508ac2 GR |
510 | /* |
511 | * Update timeout interval for the nofeedback timer. | |
512 | * We use a configuration option to increase the lower bound. | |
513 | * This can help avoid triggering the nofeedback timer too often | |
514 | * ('spinning') on LANs with small RTTs. | |
515 | */ | |
5d0dbc4a | 516 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
8a508ac2 GR |
517 | CONFIG_IP_DCCP_CCID3_RTO * |
518 | (USEC_PER_SEC/1000) ); | |
1f2333ae ACM |
519 | /* |
520 | * Schedule no feedback timer to expire in | |
8a508ac2 | 521 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
1f2333ae | 522 | */ |
8a508ac2 | 523 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
6b5e633a | 524 | |
1f2333ae ACM |
525 | ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " |
526 | "expire in %lu jiffies (%luus)\n", | |
527 | dccp_role(sk), sk, | |
2a1fda6f | 528 | usecs_to_jiffies(t_nfb), t_nfb); |
7c657876 ACM |
529 | |
530 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
2a1fda6f | 531 | jiffies + usecs_to_jiffies(t_nfb)); |
7c657876 ACM |
532 | |
533 | /* set idle flag */ | |
bf58a381 | 534 | hctx->ccid3hctx_idle = 1; |
7c657876 | 535 | break; |
5e19e3fc | 536 | case TFRC_SSTATE_NO_SENT: |
bf58a381 GR |
537 | /* XXX when implementing bidirectional rx/tx check this again */ |
538 | DCCP_WARN("Illegal ACK received - no packet sent\n"); | |
5e19e3fc GR |
539 | /* fall through */ |
540 | case TFRC_SSTATE_TERM: /* ignore feedback when closing */ | |
7c657876 ACM |
541 | break; |
542 | } | |
543 | } | |
544 | ||
7c657876 | 545 | static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, |
1f2333ae ACM |
546 | unsigned char len, u16 idx, |
547 | unsigned char *value) | |
7c657876 ACM |
548 | { |
549 | int rc = 0; | |
59725dc2 ACM |
550 | const struct dccp_sock *dp = dccp_sk(sk); |
551 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 ACM |
552 | struct ccid3_options_received *opt_recv; |
553 | ||
59d203f9 | 554 | BUG_ON(hctx == NULL); |
7c657876 ACM |
555 | |
556 | opt_recv = &hctx->ccid3hctx_options_received; | |
557 | ||
558 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { | |
559 | opt_recv->ccid3or_seqno = dp->dccps_gsr; | |
560 | opt_recv->ccid3or_loss_event_rate = ~0; | |
561 | opt_recv->ccid3or_loss_intervals_idx = 0; | |
562 | opt_recv->ccid3or_loss_intervals_len = 0; | |
563 | opt_recv->ccid3or_receive_rate = 0; | |
564 | } | |
565 | ||
566 | switch (option) { | |
567 | case TFRC_OPT_LOSS_EVENT_RATE: | |
59d203f9 | 568 | if (unlikely(len != 4)) { |
59348b19 GR |
569 | DCCP_WARN("%s, sk=%p, invalid len %d " |
570 | "for TFRC_OPT_LOSS_EVENT_RATE\n", | |
571 | dccp_role(sk), sk, len); | |
7c657876 ACM |
572 | rc = -EINVAL; |
573 | } else { | |
60fe62e7 | 574 | opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
575 | ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", |
576 | dccp_role(sk), sk, | |
577 | opt_recv->ccid3or_loss_event_rate); | |
578 | } | |
579 | break; | |
580 | case TFRC_OPT_LOSS_INTERVALS: | |
581 | opt_recv->ccid3or_loss_intervals_idx = idx; | |
582 | opt_recv->ccid3or_loss_intervals_len = len; | |
583 | ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", | |
584 | dccp_role(sk), sk, | |
585 | opt_recv->ccid3or_loss_intervals_idx, | |
586 | opt_recv->ccid3or_loss_intervals_len); | |
587 | break; | |
588 | case TFRC_OPT_RECEIVE_RATE: | |
59d203f9 | 589 | if (unlikely(len != 4)) { |
59348b19 GR |
590 | DCCP_WARN("%s, sk=%p, invalid len %d " |
591 | "for TFRC_OPT_RECEIVE_RATE\n", | |
592 | dccp_role(sk), sk, len); | |
7c657876 ACM |
593 | rc = -EINVAL; |
594 | } else { | |
60fe62e7 | 595 | opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
596 | ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", |
597 | dccp_role(sk), sk, | |
598 | opt_recv->ccid3or_receive_rate); | |
599 | } | |
600 | break; | |
601 | } | |
602 | ||
603 | return rc; | |
604 | } | |
605 | ||
91f0ebf7 | 606 | static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) |
7c657876 | 607 | { |
91f0ebf7 | 608 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
7c657876 | 609 | |
78ad713d | 610 | hctx->ccid3hctx_s = 0; |
fe0499ae | 611 | hctx->ccid3hctx_rtt = 0; |
7c657876 ACM |
612 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
613 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); | |
aa5d7df3 ACM |
614 | |
615 | hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; | |
616 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; | |
7c657876 ACM |
617 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
622 | static void ccid3_hc_tx_exit(struct sock *sk) | |
623 | { | |
59725dc2 | 624 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 625 | |
7c657876 ACM |
626 | BUG_ON(hctx == NULL); |
627 | ||
628 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); | |
629 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
630 | ||
631 | /* Empty packet history */ | |
8c60f3fa | 632 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
7c657876 ACM |
633 | } |
634 | ||
635 | /* | |
636 | * RX Half Connection methods | |
637 | */ | |
638 | ||
56724aa4 | 639 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
640 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
641 | { | |
642 | static char *ccid3_rx_state_names[] = { | |
643 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", | |
644 | [TFRC_RSTATE_DATA] = "DATA", | |
645 | [TFRC_RSTATE_TERM] = "TERM", | |
646 | }; | |
647 | ||
648 | return ccid3_rx_state_names[state]; | |
649 | } | |
650 | #endif | |
651 | ||
c25a18ba ACM |
652 | static void ccid3_hc_rx_set_state(struct sock *sk, |
653 | enum ccid3_hc_rx_states state) | |
7c657876 | 654 | { |
59725dc2 | 655 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 ACM |
656 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
657 | ||
658 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
659 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
660 | ccid3_rx_state_name(state)); | |
7c657876 ACM |
661 | WARN_ON(state == oldstate); |
662 | hcrx->ccid3hcrx_state = state; | |
663 | } | |
664 | ||
78ad713d GR |
665 | static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) |
666 | { | |
667 | if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ | |
668 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); | |
669 | else | |
670 | hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : | |
671 | (9 * hcrx->ccid3hcrx_s + len) / 10; | |
672 | } | |
673 | ||
7c657876 ACM |
674 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
675 | { | |
59725dc2 | 676 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 677 | struct dccp_sock *dp = dccp_sk(sk); |
8c60f3fa | 678 | struct dccp_rx_hist_entry *packet; |
b6ee3d4a | 679 | struct timeval now; |
0f9e5b57 | 680 | suseconds_t delta; |
7c657876 ACM |
681 | |
682 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
683 | ||
b0e56780 | 684 | dccp_timestamp(sk, &now); |
b6ee3d4a | 685 | |
7c657876 ACM |
686 | switch (hcrx->ccid3hcrx_state) { |
687 | case TFRC_RSTATE_NO_DATA: | |
688 | hcrx->ccid3hcrx_x_recv = 0; | |
689 | break; | |
0f9e5b57 GR |
690 | case TFRC_RSTATE_DATA: |
691 | delta = timeval_delta(&now, | |
692 | &hcrx->ccid3hcrx_tstamp_last_feedback); | |
693 | DCCP_BUG_ON(delta < 0); | |
b9039a2a GR |
694 | hcrx->ccid3hcrx_x_recv = |
695 | scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); | |
7c657876 | 696 | break; |
59348b19 GR |
697 | case TFRC_RSTATE_TERM: |
698 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
699 | return; |
700 | } | |
701 | ||
8c60f3fa | 702 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
59d203f9 | 703 | if (unlikely(packet == NULL)) { |
59348b19 GR |
704 | DCCP_WARN("%s, sk=%p, no data packet in history!\n", |
705 | dccp_role(sk), sk); | |
7c657876 ACM |
706 | return; |
707 | } | |
708 | ||
b6ee3d4a | 709 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
66a377c5 | 710 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
7c657876 ACM |
711 | hcrx->ccid3hcrx_bytes_recv = 0; |
712 | ||
0f9e5b57 GR |
713 | /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */ |
714 | delta = timeval_delta(&now, &packet->dccphrx_tstamp); | |
715 | DCCP_BUG_ON(delta < 0); | |
716 | hcrx->ccid3hcrx_elapsed_time = delta / 10; | |
45393a66 | 717 | |
7c657876 | 718 | if (hcrx->ccid3hcrx_p == 0) |
45393a66 GR |
719 | hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ |
720 | else if (hcrx->ccid3hcrx_p > 1000000) { | |
721 | DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); | |
722 | hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ | |
723 | } else | |
7c657876 | 724 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; |
45393a66 | 725 | |
507d37cf | 726 | dp->dccps_hc_rx_insert_options = 1; |
7c657876 ACM |
727 | dccp_send_ack(sk); |
728 | } | |
729 | ||
2d0817d1 | 730 | static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 731 | { |
59d203f9 | 732 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
60fe62e7 | 733 | __be32 x_recv, pinv; |
7c657876 | 734 | |
59d203f9 ACM |
735 | BUG_ON(hcrx == NULL); |
736 | ||
737 | if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) | |
2d0817d1 | 738 | return 0; |
7c657876 | 739 | |
66a377c5 | 740 | DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; |
4fded33b ACM |
741 | |
742 | if (dccp_packet_without_ack(skb)) | |
2d0817d1 ACM |
743 | return 0; |
744 | ||
4fded33b ACM |
745 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
746 | pinv = htonl(hcrx->ccid3hcrx_pinv); | |
2d0817d1 ACM |
747 | |
748 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && | |
749 | dccp_insert_option_elapsed_time(sk, skb, | |
750 | hcrx->ccid3hcrx_elapsed_time)) || | |
751 | dccp_insert_option_timestamp(sk, skb) || | |
752 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, | |
753 | &pinv, sizeof(pinv)) || | |
754 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, | |
755 | &x_recv, sizeof(x_recv))) | |
756 | return -1; | |
757 | ||
758 | return 0; | |
7c657876 ACM |
759 | } |
760 | ||
7c657876 ACM |
761 | /* calculate first loss interval |
762 | * | |
763 | * returns estimated loss interval in usecs */ | |
764 | ||
765 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) | |
766 | { | |
59725dc2 | 767 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
8c60f3fa | 768 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
0f9e5b57 GR |
769 | u32 x_recv, p; |
770 | suseconds_t rtt, delta; | |
b6ee3d4a | 771 | struct timeval tstamp = { 0, }; |
7c657876 ACM |
772 | int interval = 0; |
773 | int win_count = 0; | |
774 | int step = 0; | |
bfe24a6c | 775 | u64 fval; |
7c657876 | 776 | |
8c60f3fa ACM |
777 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
778 | dccphrx_node) { | |
779 | if (dccp_rx_hist_entry_data_packet(entry)) { | |
7c657876 ACM |
780 | tail = entry; |
781 | ||
782 | switch (step) { | |
783 | case 0: | |
8c60f3fa | 784 | tstamp = entry->dccphrx_tstamp; |
c1734376 | 785 | win_count = entry->dccphrx_ccval; |
7c657876 ACM |
786 | step = 1; |
787 | break; | |
788 | case 1: | |
c1734376 | 789 | interval = win_count - entry->dccphrx_ccval; |
7c657876 ACM |
790 | if (interval < 0) |
791 | interval += TFRC_WIN_COUNT_LIMIT; | |
792 | if (interval > 4) | |
793 | goto found; | |
794 | break; | |
795 | } | |
796 | } | |
797 | } | |
798 | ||
59d203f9 | 799 | if (unlikely(step == 0)) { |
59348b19 GR |
800 | DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", |
801 | dccp_role(sk), sk); | |
7c657876 ACM |
802 | return ~0; |
803 | } | |
804 | ||
59d203f9 | 805 | if (unlikely(interval == 0)) { |
59348b19 GR |
806 | DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." |
807 | "Defaulting to 1\n", dccp_role(sk), sk); | |
7c657876 ACM |
808 | interval = 1; |
809 | } | |
810 | found: | |
66a377c5 | 811 | if (!tail) { |
59348b19 | 812 | DCCP_CRIT("tail is null\n"); |
66a377c5 IM |
813 | return ~0; |
814 | } | |
0f9e5b57 GR |
815 | |
816 | delta = timeval_delta(&tstamp, &tail->dccphrx_tstamp); | |
817 | DCCP_BUG_ON(delta < 0); | |
818 | ||
819 | rtt = delta * 4 / interval; | |
820 | ccid3_pr_debug("%s, sk=%p, approximated RTT to %ldus\n", | |
7c657876 | 821 | dccp_role(sk), sk, rtt); |
59348b19 | 822 | |
bfe24a6c GR |
823 | /* |
824 | * Determine the length of the first loss interval via inverse lookup. | |
825 | * Assume that X_recv can be computed by the throughput equation | |
826 | * s | |
827 | * X_recv = -------- | |
828 | * R * fval | |
829 | * Find some p such that f(p) = fval; return 1/p [RFC 3448, 6.3.1]. | |
830 | */ | |
831 | if (rtt == 0) { /* would result in divide-by-zero */ | |
832 | DCCP_WARN("RTT==0, returning 1/p = 1\n"); | |
833 | return 1000000; | |
59348b19 | 834 | } |
7c657876 | 835 | |
b0e56780 ACM |
836 | dccp_timestamp(sk, &tstamp); |
837 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); | |
0f9e5b57 | 838 | DCCP_BUG_ON(delta <= 0); |
7c657876 | 839 | |
0f9e5b57 | 840 | x_recv = scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); |
bfe24a6c GR |
841 | if (x_recv == 0) { /* would also trigger divide-by-zero */ |
842 | DCCP_WARN("X_recv==0\n"); | |
843 | if ((x_recv = hcrx->ccid3hcrx_x_recv) == 0) { | |
844 | DCCP_BUG("stored value of X_recv is zero"); | |
845 | return 1000000; | |
846 | } | |
66a377c5 IM |
847 | } |
848 | ||
bfe24a6c GR |
849 | fval = scaled_div(hcrx->ccid3hcrx_s, rtt); |
850 | fval = scaled_div32(fval, x_recv); | |
36729c1a | 851 | p = tfrc_calc_x_reverse_lookup(fval); |
bfe24a6c | 852 | |
1f2333ae ACM |
853 | ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " |
854 | "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); | |
7c657876 ACM |
855 | |
856 | if (p == 0) | |
857 | return ~0; | |
858 | else | |
859 | return 1000000 / p; | |
860 | } | |
861 | ||
862 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) | |
863 | { | |
59725dc2 | 864 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
fc747e82 | 865 | struct dccp_li_hist_entry *head; |
66a377c5 | 866 | u64 seq_temp; |
7c657876 | 867 | |
66a377c5 IM |
868 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
869 | if (!dccp_li_hist_interval_new(ccid3_li_hist, | |
870 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) | |
871 | return; | |
7c657876 | 872 | |
fc747e82 IM |
873 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
874 | struct dccp_li_hist_entry, dccplih_node); | |
875 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); | |
66a377c5 IM |
876 | } else { |
877 | struct dccp_li_hist_entry *entry; | |
878 | struct list_head *tail; | |
879 | ||
fc747e82 IM |
880 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
881 | struct dccp_li_hist_entry, dccplih_node); | |
66a377c5 IM |
882 | /* FIXME win count check removed as was wrong */ |
883 | /* should make this check with receive history */ | |
884 | /* and compare there as per section 10.2 of RFC4342 */ | |
885 | ||
886 | /* new loss event detected */ | |
887 | /* calculate last interval length */ | |
888 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); | |
54e6ecb2 | 889 | entry = dccp_li_hist_entry_new(ccid3_li_hist, GFP_ATOMIC); |
66a377c5 IM |
890 | |
891 | if (entry == NULL) { | |
59348b19 | 892 | DCCP_BUG("out of memory - can not allocate entry"); |
ae6706f0 | 893 | return; |
66a377c5 IM |
894 | } |
895 | ||
896 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); | |
897 | ||
898 | tail = hcrx->ccid3hcrx_li_hist.prev; | |
899 | list_del(tail); | |
900 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); | |
901 | ||
902 | /* Create the newest interval */ | |
903 | entry->dccplih_seqno = seq_loss; | |
904 | entry->dccplih_interval = seq_temp; | |
905 | entry->dccplih_win_count = win_loss; | |
906 | } | |
7c657876 ACM |
907 | } |
908 | ||
66a377c5 IM |
909 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
910 | struct dccp_rx_hist_entry *packet) | |
7c657876 | 911 | { |
59725dc2 | 912 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
66a377c5 IM |
913 | struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
914 | u64 seqno = packet->dccphrx_seqno; | |
915 | u64 tmp_seqno; | |
916 | int loss = 0; | |
917 | u8 ccval; | |
918 | ||
919 | ||
920 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
921 | ||
922 | if (!rx_hist || | |
923 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
924 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
925 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
926 | goto detect_out; | |
927 | } | |
928 | ||
7c657876 | 929 | |
66a377c5 IM |
930 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
931 | > TFRC_RECV_NUM_LATE_LOSS) { | |
932 | loss = 1; | |
933 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, | |
934 | hcrx->ccid3hcrx_ccval_nonloss); | |
935 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
936 | dccp_inc_seqno(&tmp_seqno); | |
937 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
938 | dccp_inc_seqno(&tmp_seqno); | |
939 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, | |
940 | tmp_seqno, &ccval)) { | |
941 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
942 | hcrx->ccid3hcrx_ccval_nonloss = ccval; | |
943 | dccp_inc_seqno(&tmp_seqno); | |
944 | } | |
945 | } | |
946 | ||
947 | /* FIXME - this code could be simplified with above while */ | |
948 | /* but works at moment */ | |
949 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
950 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
951 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
952 | } | |
953 | ||
954 | detect_out: | |
955 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, | |
956 | &hcrx->ccid3hcrx_li_hist, packet, | |
957 | hcrx->ccid3hcrx_seqno_nonloss); | |
958 | return loss; | |
7c657876 ACM |
959 | } |
960 | ||
7c657876 ACM |
961 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
962 | { | |
59725dc2 | 963 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
4fded33b | 964 | const struct dccp_options_received *opt_recv; |
8c60f3fa | 965 | struct dccp_rx_hist_entry *packet; |
7c657876 | 966 | struct timeval now; |
0f9e5b57 GR |
967 | u32 p_prev, rtt_prev; |
968 | suseconds_t r_sample, t_elapsed; | |
78ad713d | 969 | int loss, payload_size; |
1f2333ae | 970 | |
59348b19 | 971 | BUG_ON(hcrx == NULL); |
7c657876 | 972 | |
59725dc2 | 973 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
4fded33b | 974 | |
7c657876 ACM |
975 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
976 | case DCCP_PKT_ACK: | |
977 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
978 | return; | |
979 | case DCCP_PKT_DATAACK: | |
4fded33b | 980 | if (opt_recv->dccpor_timestamp_echo == 0) |
7c657876 | 981 | break; |
66a377c5 | 982 | rtt_prev = hcrx->ccid3hcrx_rtt; |
b0e56780 | 983 | dccp_timestamp(sk, &now); |
b3a3077d ACM |
984 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
985 | r_sample = timeval_usecs(&now); | |
986 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; | |
987 | ||
0f9e5b57 | 988 | DCCP_BUG_ON(r_sample < 0); |
b3a3077d | 989 | if (unlikely(r_sample <= t_elapsed)) |
0f9e5b57 | 990 | DCCP_WARN("r_sample=%ldus, t_elapsed=%ldus\n", |
59348b19 | 991 | r_sample, t_elapsed); |
b3a3077d ACM |
992 | else |
993 | r_sample -= t_elapsed; | |
de553c18 | 994 | CCID3_RTT_SANITY_CHECK(r_sample); |
b3a3077d ACM |
995 | |
996 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
997 | hcrx->ccid3hcrx_rtt = r_sample; | |
998 | else | |
999 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + | |
1000 | r_sample / 10; | |
1001 | ||
66a377c5 IM |
1002 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
1003 | ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", | |
4fded33b ACM |
1004 | dccp_role(sk), hcrx->ccid3hcrx_rtt, |
1005 | opt_recv->dccpor_elapsed_time); | |
7c657876 ACM |
1006 | break; |
1007 | case DCCP_PKT_DATA: | |
1008 | break; | |
59d203f9 | 1009 | default: /* We're not interested in other packet types, move along */ |
7c657876 ACM |
1010 | return; |
1011 | } | |
1012 | ||
b0e56780 | 1013 | packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, |
54e6ecb2 | 1014 | skb, GFP_ATOMIC); |
59d203f9 | 1015 | if (unlikely(packet == NULL)) { |
59348b19 GR |
1016 | DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " |
1017 | "to history, consider it lost!\n", dccp_role(sk), sk); | |
7c657876 ACM |
1018 | return; |
1019 | } | |
1020 | ||
66a377c5 | 1021 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
7c657876 ACM |
1022 | |
1023 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) | |
1024 | return; | |
1025 | ||
78ad713d GR |
1026 | payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; |
1027 | ccid3_hc_rx_update_s(hcrx, payload_size); | |
1028 | ||
7c657876 ACM |
1029 | switch (hcrx->ccid3hcrx_state) { |
1030 | case TFRC_RSTATE_NO_DATA: | |
1f2333ae ACM |
1031 | ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " |
1032 | "feedback\n", | |
1033 | dccp_role(sk), sk, | |
1034 | dccp_state_name(sk->sk_state), skb); | |
7c657876 ACM |
1035 | ccid3_hc_rx_send_feedback(sk); |
1036 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); | |
1037 | return; | |
1038 | case TFRC_RSTATE_DATA: | |
78ad713d | 1039 | hcrx->ccid3hcrx_bytes_recv += payload_size; |
66a377c5 | 1040 | if (loss) |
b6ee3d4a ACM |
1041 | break; |
1042 | ||
b0e56780 | 1043 | dccp_timestamp(sk, &now); |
0f9e5b57 GR |
1044 | if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) - |
1045 | (suseconds_t)hcrx->ccid3hcrx_rtt >= 0) { | |
b6ee3d4a ACM |
1046 | hcrx->ccid3hcrx_tstamp_last_ack = now; |
1047 | ccid3_hc_rx_send_feedback(sk); | |
7c657876 | 1048 | } |
b6ee3d4a | 1049 | return; |
59348b19 GR |
1050 | case TFRC_RSTATE_TERM: |
1051 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
1052 | return; |
1053 | } | |
1054 | ||
1055 | /* Dealing with packet loss */ | |
4fded33b ACM |
1056 | ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", |
1057 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); | |
7c657876 | 1058 | |
7c657876 ACM |
1059 | p_prev = hcrx->ccid3hcrx_p; |
1060 | ||
1061 | /* Calculate loss event rate */ | |
c0996660 IM |
1062 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
1063 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); | |
1064 | ||
7c657876 | 1065 | /* Scaling up by 1000000 as fixed decimal */ |
c0996660 IM |
1066 | if (i_mean != 0) |
1067 | hcrx->ccid3hcrx_p = 1000000 / i_mean; | |
59348b19 GR |
1068 | } else |
1069 | DCCP_BUG("empty loss history"); | |
7c657876 ACM |
1070 | |
1071 | if (hcrx->ccid3hcrx_p > p_prev) { | |
1072 | ccid3_hc_rx_send_feedback(sk); | |
1073 | return; | |
1074 | } | |
1075 | } | |
1076 | ||
91f0ebf7 | 1077 | static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) |
7c657876 | 1078 | { |
91f0ebf7 | 1079 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
7c657876 ACM |
1080 | |
1081 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
1082 | ||
7c657876 ACM |
1083 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; |
1084 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); | |
ae6706f0 | 1085 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
b0e56780 | 1086 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
954ee31f | 1087 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
78ad713d | 1088 | hcrx->ccid3hcrx_s = 0; |
fe0499ae | 1089 | hcrx->ccid3hcrx_rtt = 0; |
7c657876 ACM |
1090 | return 0; |
1091 | } | |
1092 | ||
1093 | static void ccid3_hc_rx_exit(struct sock *sk) | |
1094 | { | |
59725dc2 | 1095 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 1096 | |
59d203f9 | 1097 | BUG_ON(hcrx == NULL); |
7c657876 ACM |
1098 | |
1099 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); | |
1100 | ||
1101 | /* Empty packet history */ | |
8c60f3fa | 1102 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
7c657876 ACM |
1103 | |
1104 | /* Empty loss interval history */ | |
ae6706f0 | 1105 | dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); |
7c657876 ACM |
1106 | } |
1107 | ||
2babe1f6 ACM |
1108 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
1109 | { | |
59725dc2 | 1110 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
2babe1f6 | 1111 | |
59c2353d ACM |
1112 | /* Listen socks doesn't have a private CCID block */ |
1113 | if (sk->sk_state == DCCP_LISTEN) | |
1114 | return; | |
1115 | ||
59d203f9 | 1116 | BUG_ON(hcrx == NULL); |
2babe1f6 ACM |
1117 | |
1118 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; | |
1119 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; | |
1120 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; | |
1121 | } | |
1122 | ||
1123 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) | |
1124 | { | |
59725dc2 | 1125 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
2babe1f6 | 1126 | |
59c2353d ACM |
1127 | /* Listen socks doesn't have a private CCID block */ |
1128 | if (sk->sk_state == DCCP_LISTEN) | |
1129 | return; | |
1130 | ||
59d203f9 | 1131 | BUG_ON(hctx == NULL); |
2babe1f6 ACM |
1132 | |
1133 | info->tcpi_rto = hctx->ccid3hctx_t_rto; | |
1134 | info->tcpi_rtt = hctx->ccid3hctx_rtt; | |
1135 | } | |
1136 | ||
88f964db ACM |
1137 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
1138 | u32 __user *optval, int __user *optlen) | |
1139 | { | |
1140 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); | |
1141 | const void *val; | |
1142 | ||
1143 | /* Listen socks doesn't have a private CCID block */ | |
1144 | if (sk->sk_state == DCCP_LISTEN) | |
1145 | return -EINVAL; | |
1146 | ||
1147 | switch (optname) { | |
1148 | case DCCP_SOCKOPT_CCID_RX_INFO: | |
1149 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) | |
1150 | return -EINVAL; | |
1151 | len = sizeof(hcrx->ccid3hcrx_tfrc); | |
1152 | val = &hcrx->ccid3hcrx_tfrc; | |
1153 | break; | |
1154 | default: | |
1155 | return -ENOPROTOOPT; | |
1156 | } | |
1157 | ||
1158 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1159 | return -EFAULT; | |
1160 | ||
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, | |
1165 | u32 __user *optval, int __user *optlen) | |
1166 | { | |
1167 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
1168 | const void *val; | |
1169 | ||
1170 | /* Listen socks doesn't have a private CCID block */ | |
1171 | if (sk->sk_state == DCCP_LISTEN) | |
1172 | return -EINVAL; | |
1173 | ||
1174 | switch (optname) { | |
1175 | case DCCP_SOCKOPT_CCID_TX_INFO: | |
1176 | if (len < sizeof(hctx->ccid3hctx_tfrc)) | |
1177 | return -EINVAL; | |
1178 | len = sizeof(hctx->ccid3hctx_tfrc); | |
1179 | val = &hctx->ccid3hctx_tfrc; | |
1180 | break; | |
1181 | default: | |
1182 | return -ENOPROTOOPT; | |
1183 | } | |
1184 | ||
1185 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1186 | return -EFAULT; | |
1187 | ||
1188 | return 0; | |
1189 | } | |
1190 | ||
91f0ebf7 | 1191 | static struct ccid_operations ccid3 = { |
3dd9a7c3 | 1192 | .ccid_id = DCCPC_CCID3, |
7c657876 ACM |
1193 | .ccid_name = "ccid3", |
1194 | .ccid_owner = THIS_MODULE, | |
91f0ebf7 | 1195 | .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), |
7c657876 ACM |
1196 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
1197 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, | |
1198 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, | |
1199 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, | |
1200 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, | |
7c657876 | 1201 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, |
91f0ebf7 | 1202 | .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), |
7c657876 ACM |
1203 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
1204 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, | |
1205 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, | |
1206 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, | |
2babe1f6 ACM |
1207 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
1208 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, | |
88f964db ACM |
1209 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
1210 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, | |
7c657876 ACM |
1211 | }; |
1212 | ||
56724aa4 | 1213 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
1214 | module_param(ccid3_debug, int, 0444); |
1215 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); | |
56724aa4 | 1216 | #endif |
7c657876 ACM |
1217 | |
1218 | static __init int ccid3_module_init(void) | |
1219 | { | |
8c60f3fa | 1220 | int rc = -ENOBUFS; |
7c657876 | 1221 | |
8c60f3fa ACM |
1222 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
1223 | if (ccid3_rx_hist == NULL) | |
7c657876 ACM |
1224 | goto out; |
1225 | ||
8c60f3fa ACM |
1226 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
1227 | if (ccid3_tx_hist == NULL) | |
1228 | goto out_free_rx; | |
7c657876 | 1229 | |
ae6706f0 ACM |
1230 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
1231 | if (ccid3_li_hist == NULL) | |
8c60f3fa | 1232 | goto out_free_tx; |
7c657876 ACM |
1233 | |
1234 | rc = ccid_register(&ccid3); | |
1235 | if (rc != 0) | |
1236 | goto out_free_loss_interval_history; | |
7c657876 ACM |
1237 | out: |
1238 | return rc; | |
8c60f3fa | 1239 | |
7c657876 | 1240 | out_free_loss_interval_history: |
ae6706f0 ACM |
1241 | dccp_li_hist_delete(ccid3_li_hist); |
1242 | ccid3_li_hist = NULL; | |
8c60f3fa ACM |
1243 | out_free_tx: |
1244 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1245 | ccid3_tx_hist = NULL; | |
1246 | out_free_rx: | |
1247 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1248 | ccid3_rx_hist = NULL; | |
7c657876 ACM |
1249 | goto out; |
1250 | } | |
1251 | module_init(ccid3_module_init); | |
1252 | ||
1253 | static __exit void ccid3_module_exit(void) | |
1254 | { | |
1255 | ccid_unregister(&ccid3); | |
1256 | ||
8c60f3fa ACM |
1257 | if (ccid3_tx_hist != NULL) { |
1258 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1259 | ccid3_tx_hist = NULL; | |
7c657876 | 1260 | } |
8c60f3fa ACM |
1261 | if (ccid3_rx_hist != NULL) { |
1262 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1263 | ccid3_rx_hist = NULL; | |
7c657876 | 1264 | } |
ae6706f0 ACM |
1265 | if (ccid3_li_hist != NULL) { |
1266 | dccp_li_hist_delete(ccid3_li_hist); | |
1267 | ccid3_li_hist = NULL; | |
7c657876 ACM |
1268 | } |
1269 | } | |
1270 | module_exit(ccid3_module_exit); | |
1271 | ||
e6bccd35 | 1272 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
1f2333ae | 1273 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
7c657876 ACM |
1274 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
1275 | MODULE_LICENSE("GPL"); | |
1276 | MODULE_ALIAS("net-dccp-ccid-3"); |