Commit | Line | Data |
---|---|---|
7c657876 ACM |
1 | /* |
2 | * net/dccp/ccids/ccid3.c | |
3 | * | |
4 | * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand. | |
e6bccd35 | 5 | * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz> |
7c657876 ACM |
6 | * |
7 | * An implementation of the DCCP protocol | |
8 | * | |
9 | * This code has been developed by the University of Waikato WAND | |
10 | * research group. For further information please see http://www.wand.net.nz/ | |
7c657876 ACM |
11 | * |
12 | * This code also uses code from Lulea University, rereleased as GPL by its | |
13 | * authors: | |
14 | * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon | |
15 | * | |
16 | * Changes to meet Linux coding standards, to make it meet latest ccid3 draft | |
17 | * and to make it work as a loadable module in the DCCP stack written by | |
18 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br>. | |
19 | * | |
20 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
21 | * | |
22 | * This program is free software; you can redistribute it and/or modify | |
23 | * it under the terms of the GNU General Public License as published by | |
24 | * the Free Software Foundation; either version 2 of the License, or | |
25 | * (at your option) any later version. | |
26 | * | |
27 | * This program is distributed in the hope that it will be useful, | |
28 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
29 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
30 | * GNU General Public License for more details. | |
31 | * | |
32 | * You should have received a copy of the GNU General Public License | |
33 | * along with this program; if not, write to the Free Software | |
34 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
35 | */ | |
36 | ||
37 | #include "../ccid.h" | |
38 | #include "../dccp.h" | |
4524b259 | 39 | #include "lib/packet_history.h" |
ae6706f0 | 40 | #include "lib/loss_interval.h" |
36729c1a | 41 | #include "lib/tfrc.h" |
7c657876 ACM |
42 | #include "ccid3.h" |
43 | ||
6b5e633a | 44 | /* |
0ba7a3ba ACM |
45 | * Reason for maths here is to avoid 32 bit overflow when a is big. |
46 | * With this we get close to the limit. | |
6b5e633a | 47 | */ |
c25a18ba | 48 | static u32 usecs_div(const u32 a, const u32 b) |
6b5e633a | 49 | { |
0ba7a3ba ACM |
50 | const u32 div = a < (UINT_MAX / (USEC_PER_SEC / 10)) ? 10 : |
51 | a < (UINT_MAX / (USEC_PER_SEC / 50)) ? 50 : | |
52 | a < (UINT_MAX / (USEC_PER_SEC / 100)) ? 100 : | |
53 | a < (UINT_MAX / (USEC_PER_SEC / 500)) ? 500 : | |
54 | a < (UINT_MAX / (USEC_PER_SEC / 1000)) ? 1000 : | |
55 | a < (UINT_MAX / (USEC_PER_SEC / 5000)) ? 5000 : | |
56 | a < (UINT_MAX / (USEC_PER_SEC / 10000)) ? 10000 : | |
57 | a < (UINT_MAX / (USEC_PER_SEC / 50000)) ? 50000 : | |
58 | 100000; | |
59 | const u32 tmp = a * (USEC_PER_SEC / div); | |
60 | return (b >= 2 * div) ? tmp / (b / div) : tmp; | |
6b5e633a ACM |
61 | } |
62 | ||
7c657876 | 63 | |
56724aa4 GR |
64 | |
65 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG | |
66 | static int ccid3_debug; | |
67 | #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) | |
7c657876 ACM |
68 | #else |
69 | #define ccid3_pr_debug(format, a...) | |
70 | #endif | |
71 | ||
a1d3a355 ACM |
72 | static struct dccp_tx_hist *ccid3_tx_hist; |
73 | static struct dccp_rx_hist *ccid3_rx_hist; | |
ae6706f0 | 74 | static struct dccp_li_hist *ccid3_li_hist; |
7c657876 | 75 | |
56724aa4 | 76 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
77 | static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) |
78 | { | |
79 | static char *ccid3_state_names[] = { | |
80 | [TFRC_SSTATE_NO_SENT] = "NO_SENT", | |
81 | [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", | |
82 | [TFRC_SSTATE_FBACK] = "FBACK", | |
83 | [TFRC_SSTATE_TERM] = "TERM", | |
84 | }; | |
85 | ||
86 | return ccid3_state_names[state]; | |
87 | } | |
88 | #endif | |
89 | ||
c25a18ba ACM |
90 | static void ccid3_hc_tx_set_state(struct sock *sk, |
91 | enum ccid3_hc_tx_states state) | |
7c657876 | 92 | { |
59725dc2 | 93 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 ACM |
94 | enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; |
95 | ||
96 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
97 | dccp_role(sk), sk, ccid3_tx_state_name(oldstate), |
98 | ccid3_tx_state_name(state)); | |
7c657876 ACM |
99 | WARN_ON(state == oldstate); |
100 | hctx->ccid3hctx_state = state; | |
101 | } | |
102 | ||
7c657876 ACM |
103 | /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */ |
104 | static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock *hctx) | |
105 | { | |
6b5e633a ACM |
106 | /* |
107 | * If no feedback spec says t_ipi is 1 second (set elsewhere and then | |
108 | * doubles after every no feedback timer (separate function) | |
109 | */ | |
110 | if (hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK) | |
111 | hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s, | |
112 | hctx->ccid3hctx_x); | |
7c657876 ACM |
113 | } |
114 | ||
115 | /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ | |
116 | static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx) | |
117 | { | |
1f2333ae ACM |
118 | hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, |
119 | TFRC_OPSYS_HALF_TIME_GRAN); | |
7c657876 ACM |
120 | } |
121 | ||
122 | /* | |
123 | * Update X by | |
124 | * If (p > 0) | |
125 | * x_calc = calcX(s, R, p); | |
126 | * X = max(min(X_calc, 2 * X_recv), s / t_mbi); | |
127 | * Else | |
128 | * If (now - tld >= R) | |
129 | * X = max(min(2 * X, 2 * X_recv), s / R); | |
130 | * tld = now; | |
131 | */ | |
132 | static void ccid3_hc_tx_update_x(struct sock *sk) | |
133 | { | |
59725dc2 | 134 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 135 | |
1f2333ae ACM |
136 | /* To avoid large error in calcX */ |
137 | if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { | |
36729c1a ACM |
138 | hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, |
139 | hctx->ccid3hctx_rtt, | |
140 | hctx->ccid3hctx_p); | |
1f2333ae ACM |
141 | hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, |
142 | 2 * hctx->ccid3hctx_x_recv), | |
143 | (hctx->ccid3hctx_s / | |
144 | TFRC_MAX_BACK_OFF_TIME)); | |
b6ee3d4a ACM |
145 | } else { |
146 | struct timeval now; | |
147 | ||
b0e56780 | 148 | dccp_timestamp(sk, &now); |
b6ee3d4a ACM |
149 | if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >= |
150 | hctx->ccid3hctx_rtt) { | |
6b5e633a ACM |
151 | hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv, |
152 | hctx->ccid3hctx_x) * 2, | |
153 | usecs_div(hctx->ccid3hctx_s, | |
154 | hctx->ccid3hctx_rtt)); | |
b6ee3d4a ACM |
155 | hctx->ccid3hctx_t_ld = now; |
156 | } | |
7c657876 | 157 | } |
7c657876 ACM |
158 | } |
159 | ||
160 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) | |
161 | { | |
162 | struct sock *sk = (struct sock *)data; | |
7c657876 | 163 | unsigned long next_tmout = 0; |
59725dc2 | 164 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 ACM |
165 | |
166 | bh_lock_sock(sk); | |
167 | if (sock_owned_by_user(sk)) { | |
168 | /* Try again later. */ | |
169 | /* XXX: set some sensible MIB */ | |
1f2333ae ACM |
170 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
171 | jiffies + HZ / 5); | |
7c657876 ACM |
172 | goto out; |
173 | } | |
174 | ||
175 | ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, | |
176 | ccid3_tx_state_name(hctx->ccid3hctx_state)); | |
177 | ||
7c657876 | 178 | switch (hctx->ccid3hctx_state) { |
7c657876 ACM |
179 | case TFRC_SSTATE_NO_FBACK: |
180 | /* Halve send rate */ | |
181 | hctx->ccid3hctx_x /= 2; | |
6b5e633a ACM |
182 | if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / |
183 | TFRC_MAX_BACK_OFF_TIME)) | |
1f2333ae ACM |
184 | hctx->ccid3hctx_x = (hctx->ccid3hctx_s / |
185 | TFRC_MAX_BACK_OFF_TIME); | |
7c657876 | 186 | |
1f2333ae ACM |
187 | ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " |
188 | "bytes/s\n", | |
189 | dccp_role(sk), sk, | |
190 | ccid3_tx_state_name(hctx->ccid3hctx_state), | |
7c657876 | 191 | hctx->ccid3hctx_x); |
6b5e633a ACM |
192 | next_tmout = max_t(u32, 2 * usecs_div(hctx->ccid3hctx_s, |
193 | hctx->ccid3hctx_x), | |
1f2333ae | 194 | TFRC_INITIAL_TIMEOUT); |
1f2333ae ACM |
195 | /* |
196 | * FIXME - not sure above calculation is correct. See section | |
197 | * 5 of CCID3 11 should adjust tx_t_ipi and double that to | |
198 | * achieve it really | |
199 | */ | |
7c657876 ACM |
200 | break; |
201 | case TFRC_SSTATE_FBACK: | |
1f2333ae ACM |
202 | /* |
203 | * Check if IDLE since last timeout and recv rate is less than | |
204 | * 4 packets per RTT | |
205 | */ | |
1f2333ae | 206 | if (!hctx->ccid3hctx_idle || |
6b5e633a ACM |
207 | (hctx->ccid3hctx_x_recv >= |
208 | 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { | |
1f2333ae ACM |
209 | ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", |
210 | dccp_role(sk), sk, | |
7c657876 ACM |
211 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
212 | /* Halve sending rate */ | |
213 | ||
214 | /* If (X_calc > 2 * X_recv) | |
215 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); | |
216 | * Else | |
217 | * X_recv = X_calc / 4; | |
218 | */ | |
1f2333ae ACM |
219 | BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && |
220 | hctx->ccid3hctx_x_calc == 0); | |
7c657876 ACM |
221 | |
222 | /* check also if p is zero -> x_calc is infinity? */ | |
223 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P || | |
224 | hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) | |
225 | hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, | |
226 | hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME)); | |
227 | else | |
228 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; | |
229 | ||
230 | /* Update sending rate */ | |
231 | ccid3_hc_tx_update_x(sk); | |
232 | } | |
6b5e633a ACM |
233 | /* |
234 | * Schedule no feedback timer to expire in | |
235 | * max(4 * R, 2 * s / X) | |
236 | */ | |
c68e64cf | 237 | next_tmout = max_t(u32, hctx->ccid3hctx_t_rto, |
6b5e633a ACM |
238 | 2 * usecs_div(hctx->ccid3hctx_s, |
239 | hctx->ccid3hctx_x)); | |
7c657876 | 240 | break; |
59348b19 GR |
241 | case TFRC_SSTATE_NO_SENT: |
242 | DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); | |
243 | /* fall through */ | |
244 | case TFRC_SSTATE_TERM: | |
7c657876 ACM |
245 | goto out; |
246 | } | |
247 | ||
248 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
1f2333ae | 249 | jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); |
7c657876 ACM |
250 | hctx->ccid3hctx_idle = 1; |
251 | out: | |
252 | bh_unlock_sock(sk); | |
253 | sock_put(sk); | |
254 | } | |
255 | ||
27258ee5 ACM |
256 | static int ccid3_hc_tx_send_packet(struct sock *sk, |
257 | struct sk_buff *skb, int len) | |
7c657876 ACM |
258 | { |
259 | struct dccp_sock *dp = dccp_sk(sk); | |
59725dc2 | 260 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
8c60f3fa | 261 | struct dccp_tx_hist_entry *new_packet; |
7c657876 | 262 | struct timeval now; |
27258ee5 | 263 | long delay; |
7c657876 ACM |
264 | int rc = -ENOTCONN; |
265 | ||
59348b19 | 266 | BUG_ON(hctx == NULL); |
1f2333ae | 267 | |
59d203f9 | 268 | /* Check if pure ACK or Terminating*/ |
7c657876 | 269 | /* |
1f2333ae ACM |
270 | * XXX: We only call this function for DATA and DATAACK, on, these |
271 | * packets can have zero length, but why the comment about "pure ACK"? | |
7c657876 | 272 | */ |
59d203f9 | 273 | if (unlikely(len == 0)) |
7c657876 ACM |
274 | goto out; |
275 | ||
276 | /* See if last packet allocated was not sent */ | |
8c60f3fa ACM |
277 | new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
278 | if (new_packet == NULL || new_packet->dccphtx_sent) { | |
1f2333ae ACM |
279 | new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, |
280 | SLAB_ATOMIC); | |
7c657876 ACM |
281 | |
282 | rc = -ENOBUFS; | |
59d203f9 | 283 | if (unlikely(new_packet == NULL)) { |
59348b19 GR |
284 | DCCP_WARN("%s, sk=%p, not enough mem to add to history," |
285 | "send refused\n", dccp_role(sk), sk); | |
7c657876 ACM |
286 | goto out; |
287 | } | |
288 | ||
8c60f3fa | 289 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); |
7c657876 ACM |
290 | } |
291 | ||
b0e56780 | 292 | dccp_timestamp(sk, &now); |
7c657876 ACM |
293 | |
294 | switch (hctx->ccid3hctx_state) { | |
295 | case TFRC_SSTATE_NO_SENT: | |
1f2333ae ACM |
296 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
297 | jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); | |
7c657876 ACM |
298 | hctx->ccid3hctx_last_win_count = 0; |
299 | hctx->ccid3hctx_t_last_win_count = now; | |
300 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); | |
7c657876 | 301 | |
90feeb95 GR |
302 | /* First timeout, according to [RFC 3448, 4.2], is 1 second */ |
303 | hctx->ccid3hctx_t_ipi = USEC_PER_SEC; | |
304 | /* Initial delta: minimum of 0.5 sec and t_gran/2 */ | |
305 | hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; | |
306 | ||
307 | /* Set t_0 for initial packet */ | |
7c657876 | 308 | hctx->ccid3hctx_t_nom = now; |
7c657876 ACM |
309 | rc = 0; |
310 | break; | |
311 | case TFRC_SSTATE_NO_FBACK: | |
312 | case TFRC_SSTATE_FBACK: | |
b6ee3d4a ACM |
313 | delay = (timeval_delta(&now, &hctx->ccid3hctx_t_nom) - |
314 | hctx->ccid3hctx_delta); | |
27258ee5 | 315 | delay /= -1000; |
7c657876 | 316 | /* divide by -1000 is to convert to ms and get sign right */ |
d6809c12 | 317 | rc = delay > 0 ? delay : 0; |
7c657876 | 318 | break; |
59348b19 GR |
319 | case TFRC_SSTATE_TERM: |
320 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
321 | rc = -EINVAL; |
322 | break; | |
323 | } | |
324 | ||
325 | /* Can we send? if so add options and add to packet history */ | |
507d37cf ACM |
326 | if (rc == 0) { |
327 | dp->dccps_hc_tx_insert_options = 1; | |
c1734376 | 328 | new_packet->dccphtx_ccval = |
8c60f3fa ACM |
329 | DCCP_SKB_CB(skb)->dccpd_ccval = |
330 | hctx->ccid3hctx_last_win_count; | |
66a377c5 IM |
331 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, |
332 | hctx->ccid3hctx_t_ipi); | |
507d37cf | 333 | } |
7c657876 ACM |
334 | out: |
335 | return rc; | |
336 | } | |
337 | ||
338 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len) | |
339 | { | |
59725dc2 ACM |
340 | const struct dccp_sock *dp = dccp_sk(sk); |
341 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 ACM |
342 | struct timeval now; |
343 | ||
59348b19 | 344 | BUG_ON(hctx == NULL); |
7c657876 | 345 | |
b0e56780 | 346 | dccp_timestamp(sk, &now); |
7c657876 ACM |
347 | |
348 | /* check if we have sent a data packet */ | |
349 | if (len > 0) { | |
350 | unsigned long quarter_rtt; | |
8c60f3fa | 351 | struct dccp_tx_hist_entry *packet; |
7c657876 | 352 | |
8c60f3fa | 353 | packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
59d203f9 | 354 | if (unlikely(packet == NULL)) { |
59348b19 | 355 | DCCP_WARN("packet doesn't exist in history!\n"); |
7c657876 ACM |
356 | return; |
357 | } | |
59d203f9 | 358 | if (unlikely(packet->dccphtx_sent)) { |
59348b19 | 359 | DCCP_WARN("no unsent packet in history!\n"); |
7c657876 ACM |
360 | return; |
361 | } | |
8c60f3fa ACM |
362 | packet->dccphtx_tstamp = now; |
363 | packet->dccphtx_seqno = dp->dccps_gss; | |
7c657876 | 364 | /* |
1f2333ae | 365 | * Check if win_count have changed |
0e64e94e | 366 | * Algorithm in "8.1. Window Counter Value" in RFC 4342. |
7c657876 | 367 | */ |
6b5e633a ACM |
368 | quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); |
369 | if (likely(hctx->ccid3hctx_rtt > 8)) | |
370 | quarter_rtt /= hctx->ccid3hctx_rtt / 4; | |
371 | ||
7c657876 ACM |
372 | if (quarter_rtt > 0) { |
373 | hctx->ccid3hctx_t_last_win_count = now; | |
374 | hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + | |
375 | min_t(unsigned long, quarter_rtt, 5)) % 16; | |
1f2333ae ACM |
376 | ccid3_pr_debug("%s, sk=%p, window changed from " |
377 | "%u to %u!\n", | |
7c657876 | 378 | dccp_role(sk), sk, |
c1734376 | 379 | packet->dccphtx_ccval, |
7c657876 ACM |
380 | hctx->ccid3hctx_last_win_count); |
381 | } | |
1f2333ae | 382 | |
7c657876 | 383 | hctx->ccid3hctx_idle = 0; |
c1734376 | 384 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; |
8c60f3fa | 385 | packet->dccphtx_sent = 1; |
7c657876 ACM |
386 | } else |
387 | ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", | |
388 | dccp_role(sk), sk, dp->dccps_gss); | |
389 | ||
390 | switch (hctx->ccid3hctx_state) { | |
391 | case TFRC_SSTATE_NO_SENT: | |
392 | /* if first wasn't pure ack */ | |
393 | if (len != 0) | |
59348b19 GR |
394 | DCCP_CRIT("%s, First packet sent is noted " |
395 | "as a data packet", dccp_role(sk)); | |
7c657876 ACM |
396 | return; |
397 | case TFRC_SSTATE_NO_FBACK: | |
398 | case TFRC_SSTATE_FBACK: | |
399 | if (len > 0) { | |
66a377c5 IM |
400 | timeval_sub_usecs(&hctx->ccid3hctx_t_nom, |
401 | hctx->ccid3hctx_t_ipi); | |
7c657876 ACM |
402 | ccid3_calc_new_t_ipi(hctx); |
403 | ccid3_calc_new_delta(hctx); | |
b6ee3d4a ACM |
404 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, |
405 | hctx->ccid3hctx_t_ipi); | |
7c657876 ACM |
406 | } |
407 | break; | |
59348b19 GR |
408 | case TFRC_SSTATE_TERM: |
409 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
410 | break; |
411 | } | |
412 | } | |
413 | ||
414 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) | |
415 | { | |
59725dc2 ACM |
416 | const struct dccp_sock *dp = dccp_sk(sk); |
417 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 | 418 | struct ccid3_options_received *opt_recv; |
8c60f3fa | 419 | struct dccp_tx_hist_entry *packet; |
b0e56780 | 420 | struct timeval now; |
7c657876 | 421 | unsigned long next_tmout; |
1bc09869 | 422 | u32 t_elapsed; |
7c657876 ACM |
423 | u32 pinv; |
424 | u32 x_recv; | |
425 | u32 r_sample; | |
1f2333ae | 426 | |
59348b19 | 427 | BUG_ON(hctx == NULL); |
7c657876 ACM |
428 | |
429 | /* we are only interested in ACKs */ | |
430 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || | |
431 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) | |
432 | return; | |
433 | ||
434 | opt_recv = &hctx->ccid3hctx_options_received; | |
435 | ||
1a28599a | 436 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; |
7c657876 ACM |
437 | x_recv = opt_recv->ccid3or_receive_rate; |
438 | pinv = opt_recv->ccid3or_loss_event_rate; | |
439 | ||
440 | switch (hctx->ccid3hctx_state) { | |
441 | case TFRC_SSTATE_NO_SENT: | |
442 | /* FIXME: what to do here? */ | |
443 | return; | |
444 | case TFRC_SSTATE_NO_FBACK: | |
445 | case TFRC_SSTATE_FBACK: | |
446 | /* Calculate new round trip sample by | |
447 | * R_sample = (now - t_recvdata) - t_delay */ | |
448 | /* get t_recvdata from history */ | |
8c60f3fa ACM |
449 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
450 | DCCP_SKB_CB(skb)->dccpd_ack_seq); | |
59d203f9 | 451 | if (unlikely(packet == NULL)) { |
59348b19 GR |
452 | DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist " |
453 | "in history!\n", dccp_role(sk), sk, | |
59d203f9 | 454 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
59348b19 | 455 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
7c657876 ACM |
456 | return; |
457 | } | |
458 | ||
459 | /* Update RTT */ | |
b0e56780 ACM |
460 | dccp_timestamp(sk, &now); |
461 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); | |
1a28599a | 462 | if (unlikely(r_sample <= t_elapsed)) |
59348b19 GR |
463 | DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n", |
464 | r_sample, t_elapsed); | |
1a28599a ACM |
465 | else |
466 | r_sample -= t_elapsed; | |
7c657876 ACM |
467 | |
468 | /* Update RTT estimate by | |
469 | * If (No feedback recv) | |
470 | * R = R_sample; | |
471 | * Else | |
472 | * R = q * R + (1 - q) * R_sample; | |
473 | * | |
474 | * q is a constant, RFC 3448 recomments 0.9 | |
475 | */ | |
476 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { | |
477 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); | |
478 | hctx->ccid3hctx_rtt = r_sample; | |
479 | } else | |
1f2333ae ACM |
480 | hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + |
481 | r_sample / 10; | |
7c657876 | 482 | |
1f2333ae ACM |
483 | ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " |
484 | "r_sample=%us\n", dccp_role(sk), sk, | |
485 | hctx->ccid3hctx_rtt, r_sample); | |
7c657876 ACM |
486 | |
487 | /* Update timeout interval */ | |
c68e64cf ACM |
488 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
489 | USEC_PER_SEC); | |
7c657876 ACM |
490 | |
491 | /* Update receive rate */ | |
1f2333ae | 492 | hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ |
7c657876 ACM |
493 | |
494 | /* Update loss event rate */ | |
495 | if (pinv == ~0 || pinv == 0) | |
496 | hctx->ccid3hctx_p = 0; | |
497 | else { | |
498 | hctx->ccid3hctx_p = 1000000 / pinv; | |
499 | ||
500 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { | |
501 | hctx->ccid3hctx_p = TFRC_SMALLEST_P; | |
1f2333ae ACM |
502 | ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", |
503 | dccp_role(sk), sk); | |
7c657876 ACM |
504 | } |
505 | } | |
506 | ||
507 | /* unschedule no feedback timer */ | |
508 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
509 | ||
510 | /* Update sending rate */ | |
511 | ccid3_hc_tx_update_x(sk); | |
512 | ||
513 | /* Update next send time */ | |
b6ee3d4a ACM |
514 | timeval_sub_usecs(&hctx->ccid3hctx_t_nom, |
515 | hctx->ccid3hctx_t_ipi); | |
7c657876 | 516 | ccid3_calc_new_t_ipi(hctx); |
b6ee3d4a ACM |
517 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, |
518 | hctx->ccid3hctx_t_ipi); | |
7c657876 ACM |
519 | ccid3_calc_new_delta(hctx); |
520 | ||
521 | /* remove all packets older than the one acked from history */ | |
8c60f3fa ACM |
522 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
523 | &hctx->ccid3hctx_hist, packet); | |
c530cfb1 ACM |
524 | /* |
525 | * As we have calculated new ipi, delta, t_nom it is possible that | |
526 | * we now can send a packet, so wake up dccp_wait_for_ccids. | |
527 | */ | |
528 | sk->sk_write_space(sk); | |
8c60f3fa | 529 | |
1f2333ae ACM |
530 | /* |
531 | * Schedule no feedback timer to expire in | |
532 | * max(4 * R, 2 * s / X) | |
533 | */ | |
c68e64cf | 534 | next_tmout = max(hctx->ccid3hctx_t_rto, |
6b5e633a ACM |
535 | 2 * usecs_div(hctx->ccid3hctx_s, |
536 | hctx->ccid3hctx_x)); | |
537 | ||
1f2333ae ACM |
538 | ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " |
539 | "expire in %lu jiffies (%luus)\n", | |
540 | dccp_role(sk), sk, | |
541 | usecs_to_jiffies(next_tmout), next_tmout); | |
7c657876 ACM |
542 | |
543 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
1f2333ae | 544 | jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); |
7c657876 ACM |
545 | |
546 | /* set idle flag */ | |
547 | hctx->ccid3hctx_idle = 1; | |
548 | break; | |
59348b19 GR |
549 | case TFRC_SSTATE_TERM: |
550 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
551 | break; |
552 | } | |
553 | } | |
554 | ||
2d0817d1 | 555 | static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 556 | { |
59d203f9 | 557 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 558 | |
59d203f9 ACM |
559 | BUG_ON(hctx == NULL); |
560 | ||
2d0817d1 ACM |
561 | if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) |
562 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; | |
563 | return 0; | |
7c657876 ACM |
564 | } |
565 | ||
566 | static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, | |
1f2333ae ACM |
567 | unsigned char len, u16 idx, |
568 | unsigned char *value) | |
7c657876 ACM |
569 | { |
570 | int rc = 0; | |
59725dc2 ACM |
571 | const struct dccp_sock *dp = dccp_sk(sk); |
572 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 ACM |
573 | struct ccid3_options_received *opt_recv; |
574 | ||
59d203f9 | 575 | BUG_ON(hctx == NULL); |
7c657876 ACM |
576 | |
577 | opt_recv = &hctx->ccid3hctx_options_received; | |
578 | ||
579 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { | |
580 | opt_recv->ccid3or_seqno = dp->dccps_gsr; | |
581 | opt_recv->ccid3or_loss_event_rate = ~0; | |
582 | opt_recv->ccid3or_loss_intervals_idx = 0; | |
583 | opt_recv->ccid3or_loss_intervals_len = 0; | |
584 | opt_recv->ccid3or_receive_rate = 0; | |
585 | } | |
586 | ||
587 | switch (option) { | |
588 | case TFRC_OPT_LOSS_EVENT_RATE: | |
59d203f9 | 589 | if (unlikely(len != 4)) { |
59348b19 GR |
590 | DCCP_WARN("%s, sk=%p, invalid len %d " |
591 | "for TFRC_OPT_LOSS_EVENT_RATE\n", | |
592 | dccp_role(sk), sk, len); | |
7c657876 ACM |
593 | rc = -EINVAL; |
594 | } else { | |
60fe62e7 | 595 | opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
596 | ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", |
597 | dccp_role(sk), sk, | |
598 | opt_recv->ccid3or_loss_event_rate); | |
599 | } | |
600 | break; | |
601 | case TFRC_OPT_LOSS_INTERVALS: | |
602 | opt_recv->ccid3or_loss_intervals_idx = idx; | |
603 | opt_recv->ccid3or_loss_intervals_len = len; | |
604 | ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", | |
605 | dccp_role(sk), sk, | |
606 | opt_recv->ccid3or_loss_intervals_idx, | |
607 | opt_recv->ccid3or_loss_intervals_len); | |
608 | break; | |
609 | case TFRC_OPT_RECEIVE_RATE: | |
59d203f9 | 610 | if (unlikely(len != 4)) { |
59348b19 GR |
611 | DCCP_WARN("%s, sk=%p, invalid len %d " |
612 | "for TFRC_OPT_RECEIVE_RATE\n", | |
613 | dccp_role(sk), sk, len); | |
7c657876 ACM |
614 | rc = -EINVAL; |
615 | } else { | |
60fe62e7 | 616 | opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
617 | ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", |
618 | dccp_role(sk), sk, | |
619 | opt_recv->ccid3or_receive_rate); | |
620 | } | |
621 | break; | |
622 | } | |
623 | ||
624 | return rc; | |
625 | } | |
626 | ||
91f0ebf7 | 627 | static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) |
7c657876 ACM |
628 | { |
629 | struct dccp_sock *dp = dccp_sk(sk); | |
91f0ebf7 | 630 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
7c657876 | 631 | |
a84ffe43 ACM |
632 | if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && |
633 | dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) | |
634 | hctx->ccid3hctx_s = dp->dccps_packet_size; | |
7c657876 ACM |
635 | else |
636 | hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE; | |
637 | ||
1f2333ae ACM |
638 | /* Set transmission rate to 1 packet per second */ |
639 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; | |
c68e64cf | 640 | hctx->ccid3hctx_t_rto = USEC_PER_SEC; |
7c657876 ACM |
641 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
642 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); | |
aa5d7df3 ACM |
643 | |
644 | hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; | |
645 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; | |
7c657876 ACM |
646 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
647 | ||
648 | return 0; | |
649 | } | |
650 | ||
651 | static void ccid3_hc_tx_exit(struct sock *sk) | |
652 | { | |
59725dc2 | 653 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 654 | |
7c657876 ACM |
655 | BUG_ON(hctx == NULL); |
656 | ||
657 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); | |
658 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
659 | ||
660 | /* Empty packet history */ | |
8c60f3fa | 661 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
7c657876 ACM |
662 | } |
663 | ||
664 | /* | |
665 | * RX Half Connection methods | |
666 | */ | |
667 | ||
56724aa4 | 668 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
669 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
670 | { | |
671 | static char *ccid3_rx_state_names[] = { | |
672 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", | |
673 | [TFRC_RSTATE_DATA] = "DATA", | |
674 | [TFRC_RSTATE_TERM] = "TERM", | |
675 | }; | |
676 | ||
677 | return ccid3_rx_state_names[state]; | |
678 | } | |
679 | #endif | |
680 | ||
c25a18ba ACM |
681 | static void ccid3_hc_rx_set_state(struct sock *sk, |
682 | enum ccid3_hc_rx_states state) | |
7c657876 | 683 | { |
59725dc2 | 684 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 ACM |
685 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
686 | ||
687 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
688 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
689 | ccid3_rx_state_name(state)); | |
7c657876 ACM |
690 | WARN_ON(state == oldstate); |
691 | hcrx->ccid3hcrx_state = state; | |
692 | } | |
693 | ||
7c657876 ACM |
694 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
695 | { | |
59725dc2 | 696 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 697 | struct dccp_sock *dp = dccp_sk(sk); |
8c60f3fa | 698 | struct dccp_rx_hist_entry *packet; |
b6ee3d4a | 699 | struct timeval now; |
7c657876 ACM |
700 | |
701 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
702 | ||
b0e56780 | 703 | dccp_timestamp(sk, &now); |
b6ee3d4a | 704 | |
7c657876 ACM |
705 | switch (hcrx->ccid3hcrx_state) { |
706 | case TFRC_RSTATE_NO_DATA: | |
707 | hcrx->ccid3hcrx_x_recv = 0; | |
708 | break; | |
709 | case TFRC_RSTATE_DATA: { | |
b6ee3d4a ACM |
710 | const u32 delta = timeval_delta(&now, |
711 | &hcrx->ccid3hcrx_tstamp_last_feedback); | |
27ae543e ACM |
712 | hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, |
713 | delta); | |
7c657876 ACM |
714 | } |
715 | break; | |
59348b19 GR |
716 | case TFRC_RSTATE_TERM: |
717 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
718 | return; |
719 | } | |
720 | ||
8c60f3fa | 721 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
59d203f9 | 722 | if (unlikely(packet == NULL)) { |
59348b19 GR |
723 | DCCP_WARN("%s, sk=%p, no data packet in history!\n", |
724 | dccp_role(sk), sk); | |
7c657876 ACM |
725 | return; |
726 | } | |
727 | ||
b6ee3d4a | 728 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
66a377c5 | 729 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
7c657876 ACM |
730 | hcrx->ccid3hcrx_bytes_recv = 0; |
731 | ||
732 | /* Convert to multiples of 10us */ | |
b6ee3d4a ACM |
733 | hcrx->ccid3hcrx_elapsed_time = |
734 | timeval_delta(&now, &packet->dccphrx_tstamp) / 10; | |
7c657876 ACM |
735 | if (hcrx->ccid3hcrx_p == 0) |
736 | hcrx->ccid3hcrx_pinv = ~0; | |
737 | else | |
738 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; | |
507d37cf | 739 | dp->dccps_hc_rx_insert_options = 1; |
7c657876 ACM |
740 | dccp_send_ack(sk); |
741 | } | |
742 | ||
2d0817d1 | 743 | static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 744 | { |
59d203f9 | 745 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
60fe62e7 | 746 | __be32 x_recv, pinv; |
7c657876 | 747 | |
59d203f9 ACM |
748 | BUG_ON(hcrx == NULL); |
749 | ||
750 | if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) | |
2d0817d1 | 751 | return 0; |
7c657876 | 752 | |
66a377c5 | 753 | DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; |
4fded33b ACM |
754 | |
755 | if (dccp_packet_without_ack(skb)) | |
2d0817d1 ACM |
756 | return 0; |
757 | ||
4fded33b ACM |
758 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
759 | pinv = htonl(hcrx->ccid3hcrx_pinv); | |
2d0817d1 ACM |
760 | |
761 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && | |
762 | dccp_insert_option_elapsed_time(sk, skb, | |
763 | hcrx->ccid3hcrx_elapsed_time)) || | |
764 | dccp_insert_option_timestamp(sk, skb) || | |
765 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, | |
766 | &pinv, sizeof(pinv)) || | |
767 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, | |
768 | &x_recv, sizeof(x_recv))) | |
769 | return -1; | |
770 | ||
771 | return 0; | |
7c657876 ACM |
772 | } |
773 | ||
7c657876 ACM |
774 | /* calculate first loss interval |
775 | * | |
776 | * returns estimated loss interval in usecs */ | |
777 | ||
778 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) | |
779 | { | |
59725dc2 | 780 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
8c60f3fa | 781 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
7c657876 | 782 | u32 rtt, delta, x_recv, fval, p, tmp2; |
b6ee3d4a | 783 | struct timeval tstamp = { 0, }; |
7c657876 ACM |
784 | int interval = 0; |
785 | int win_count = 0; | |
786 | int step = 0; | |
787 | u64 tmp1; | |
788 | ||
8c60f3fa ACM |
789 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
790 | dccphrx_node) { | |
791 | if (dccp_rx_hist_entry_data_packet(entry)) { | |
7c657876 ACM |
792 | tail = entry; |
793 | ||
794 | switch (step) { | |
795 | case 0: | |
8c60f3fa | 796 | tstamp = entry->dccphrx_tstamp; |
c1734376 | 797 | win_count = entry->dccphrx_ccval; |
7c657876 ACM |
798 | step = 1; |
799 | break; | |
800 | case 1: | |
c1734376 | 801 | interval = win_count - entry->dccphrx_ccval; |
7c657876 ACM |
802 | if (interval < 0) |
803 | interval += TFRC_WIN_COUNT_LIMIT; | |
804 | if (interval > 4) | |
805 | goto found; | |
806 | break; | |
807 | } | |
808 | } | |
809 | } | |
810 | ||
59d203f9 | 811 | if (unlikely(step == 0)) { |
59348b19 GR |
812 | DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", |
813 | dccp_role(sk), sk); | |
7c657876 ACM |
814 | return ~0; |
815 | } | |
816 | ||
59d203f9 | 817 | if (unlikely(interval == 0)) { |
59348b19 GR |
818 | DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." |
819 | "Defaulting to 1\n", dccp_role(sk), sk); | |
7c657876 ACM |
820 | interval = 1; |
821 | } | |
822 | found: | |
66a377c5 | 823 | if (!tail) { |
59348b19 | 824 | DCCP_CRIT("tail is null\n"); |
66a377c5 IM |
825 | return ~0; |
826 | } | |
b6ee3d4a | 827 | rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; |
7c657876 ACM |
828 | ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", |
829 | dccp_role(sk), sk, rtt); | |
59348b19 GR |
830 | |
831 | if (rtt == 0) { | |
832 | DCCP_WARN("RTT==0, setting to 1\n"); | |
833 | rtt = 1; | |
834 | } | |
7c657876 | 835 | |
b0e56780 ACM |
836 | dccp_timestamp(sk, &tstamp); |
837 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); | |
838 | x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); | |
7c657876 | 839 | |
66a377c5 IM |
840 | if (x_recv == 0) |
841 | x_recv = hcrx->ccid3hcrx_x_recv; | |
842 | ||
7c657876 ACM |
843 | tmp1 = (u64)x_recv * (u64)rtt; |
844 | do_div(tmp1,10000000); | |
845 | tmp2 = (u32)tmp1; | |
66a377c5 IM |
846 | |
847 | if (!tmp2) { | |
59348b19 | 848 | DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv, rtt); |
66a377c5 IM |
849 | return ~0; |
850 | } | |
851 | ||
7c657876 ACM |
852 | fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; |
853 | /* do not alter order above or you will get overflow on 32 bit */ | |
36729c1a | 854 | p = tfrc_calc_x_reverse_lookup(fval); |
1f2333ae ACM |
855 | ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " |
856 | "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); | |
7c657876 ACM |
857 | |
858 | if (p == 0) | |
859 | return ~0; | |
860 | else | |
861 | return 1000000 / p; | |
862 | } | |
863 | ||
864 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) | |
865 | { | |
59725dc2 | 866 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
fc747e82 | 867 | struct dccp_li_hist_entry *head; |
66a377c5 | 868 | u64 seq_temp; |
7c657876 | 869 | |
66a377c5 IM |
870 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
871 | if (!dccp_li_hist_interval_new(ccid3_li_hist, | |
872 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) | |
873 | return; | |
7c657876 | 874 | |
fc747e82 IM |
875 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
876 | struct dccp_li_hist_entry, dccplih_node); | |
877 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); | |
66a377c5 IM |
878 | } else { |
879 | struct dccp_li_hist_entry *entry; | |
880 | struct list_head *tail; | |
881 | ||
fc747e82 IM |
882 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
883 | struct dccp_li_hist_entry, dccplih_node); | |
66a377c5 IM |
884 | /* FIXME win count check removed as was wrong */ |
885 | /* should make this check with receive history */ | |
886 | /* and compare there as per section 10.2 of RFC4342 */ | |
887 | ||
888 | /* new loss event detected */ | |
889 | /* calculate last interval length */ | |
890 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); | |
891 | entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); | |
892 | ||
893 | if (entry == NULL) { | |
59348b19 | 894 | DCCP_BUG("out of memory - can not allocate entry"); |
ae6706f0 | 895 | return; |
66a377c5 IM |
896 | } |
897 | ||
898 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); | |
899 | ||
900 | tail = hcrx->ccid3hcrx_li_hist.prev; | |
901 | list_del(tail); | |
902 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); | |
903 | ||
904 | /* Create the newest interval */ | |
905 | entry->dccplih_seqno = seq_loss; | |
906 | entry->dccplih_interval = seq_temp; | |
907 | entry->dccplih_win_count = win_loss; | |
908 | } | |
7c657876 ACM |
909 | } |
910 | ||
66a377c5 IM |
911 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
912 | struct dccp_rx_hist_entry *packet) | |
7c657876 | 913 | { |
59725dc2 | 914 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
66a377c5 IM |
915 | struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
916 | u64 seqno = packet->dccphrx_seqno; | |
917 | u64 tmp_seqno; | |
918 | int loss = 0; | |
919 | u8 ccval; | |
920 | ||
921 | ||
922 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
923 | ||
924 | if (!rx_hist || | |
925 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
926 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
927 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
928 | goto detect_out; | |
929 | } | |
930 | ||
7c657876 | 931 | |
66a377c5 IM |
932 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
933 | > TFRC_RECV_NUM_LATE_LOSS) { | |
934 | loss = 1; | |
935 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, | |
936 | hcrx->ccid3hcrx_ccval_nonloss); | |
937 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
938 | dccp_inc_seqno(&tmp_seqno); | |
939 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
940 | dccp_inc_seqno(&tmp_seqno); | |
941 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, | |
942 | tmp_seqno, &ccval)) { | |
943 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
944 | hcrx->ccid3hcrx_ccval_nonloss = ccval; | |
945 | dccp_inc_seqno(&tmp_seqno); | |
946 | } | |
947 | } | |
948 | ||
949 | /* FIXME - this code could be simplified with above while */ | |
950 | /* but works at moment */ | |
951 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
952 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
953 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
954 | } | |
955 | ||
956 | detect_out: | |
957 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, | |
958 | &hcrx->ccid3hcrx_li_hist, packet, | |
959 | hcrx->ccid3hcrx_seqno_nonloss); | |
960 | return loss; | |
7c657876 ACM |
961 | } |
962 | ||
7c657876 ACM |
963 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
964 | { | |
59725dc2 | 965 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
4fded33b | 966 | const struct dccp_options_received *opt_recv; |
8c60f3fa | 967 | struct dccp_rx_hist_entry *packet; |
7c657876 | 968 | struct timeval now; |
66a377c5 IM |
969 | u32 p_prev, rtt_prev, r_sample, t_elapsed; |
970 | int loss; | |
1f2333ae | 971 | |
59348b19 | 972 | BUG_ON(hcrx == NULL); |
7c657876 | 973 | |
59725dc2 | 974 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
4fded33b | 975 | |
7c657876 ACM |
976 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
977 | case DCCP_PKT_ACK: | |
978 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
979 | return; | |
980 | case DCCP_PKT_DATAACK: | |
4fded33b | 981 | if (opt_recv->dccpor_timestamp_echo == 0) |
7c657876 | 982 | break; |
66a377c5 | 983 | rtt_prev = hcrx->ccid3hcrx_rtt; |
b0e56780 | 984 | dccp_timestamp(sk, &now); |
b3a3077d ACM |
985 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
986 | r_sample = timeval_usecs(&now); | |
987 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; | |
988 | ||
989 | if (unlikely(r_sample <= t_elapsed)) | |
59348b19 GR |
990 | DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", |
991 | r_sample, t_elapsed); | |
b3a3077d ACM |
992 | else |
993 | r_sample -= t_elapsed; | |
994 | ||
995 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
996 | hcrx->ccid3hcrx_rtt = r_sample; | |
997 | else | |
998 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + | |
999 | r_sample / 10; | |
1000 | ||
66a377c5 IM |
1001 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
1002 | ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", | |
4fded33b ACM |
1003 | dccp_role(sk), hcrx->ccid3hcrx_rtt, |
1004 | opt_recv->dccpor_elapsed_time); | |
7c657876 ACM |
1005 | break; |
1006 | case DCCP_PKT_DATA: | |
1007 | break; | |
59d203f9 | 1008 | default: /* We're not interested in other packet types, move along */ |
7c657876 ACM |
1009 | return; |
1010 | } | |
1011 | ||
b0e56780 | 1012 | packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, |
8c60f3fa | 1013 | skb, SLAB_ATOMIC); |
59d203f9 | 1014 | if (unlikely(packet == NULL)) { |
59348b19 GR |
1015 | DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " |
1016 | "to history, consider it lost!\n", dccp_role(sk), sk); | |
7c657876 ACM |
1017 | return; |
1018 | } | |
1019 | ||
66a377c5 | 1020 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
7c657876 ACM |
1021 | |
1022 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) | |
1023 | return; | |
1024 | ||
1025 | switch (hcrx->ccid3hcrx_state) { | |
1026 | case TFRC_RSTATE_NO_DATA: | |
1f2333ae ACM |
1027 | ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " |
1028 | "feedback\n", | |
1029 | dccp_role(sk), sk, | |
1030 | dccp_state_name(sk->sk_state), skb); | |
7c657876 ACM |
1031 | ccid3_hc_rx_send_feedback(sk); |
1032 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); | |
1033 | return; | |
1034 | case TFRC_RSTATE_DATA: | |
1f2333ae ACM |
1035 | hcrx->ccid3hcrx_bytes_recv += skb->len - |
1036 | dccp_hdr(skb)->dccph_doff * 4; | |
66a377c5 | 1037 | if (loss) |
b6ee3d4a ACM |
1038 | break; |
1039 | ||
b0e56780 | 1040 | dccp_timestamp(sk, &now); |
b6ee3d4a ACM |
1041 | if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= |
1042 | hcrx->ccid3hcrx_rtt) { | |
1043 | hcrx->ccid3hcrx_tstamp_last_ack = now; | |
1044 | ccid3_hc_rx_send_feedback(sk); | |
7c657876 | 1045 | } |
b6ee3d4a | 1046 | return; |
59348b19 GR |
1047 | case TFRC_RSTATE_TERM: |
1048 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); | |
7c657876 ACM |
1049 | return; |
1050 | } | |
1051 | ||
1052 | /* Dealing with packet loss */ | |
4fded33b ACM |
1053 | ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", |
1054 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); | |
7c657876 | 1055 | |
7c657876 ACM |
1056 | p_prev = hcrx->ccid3hcrx_p; |
1057 | ||
1058 | /* Calculate loss event rate */ | |
c0996660 IM |
1059 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
1060 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); | |
1061 | ||
7c657876 | 1062 | /* Scaling up by 1000000 as fixed decimal */ |
c0996660 IM |
1063 | if (i_mean != 0) |
1064 | hcrx->ccid3hcrx_p = 1000000 / i_mean; | |
59348b19 GR |
1065 | } else |
1066 | DCCP_BUG("empty loss history"); | |
7c657876 ACM |
1067 | |
1068 | if (hcrx->ccid3hcrx_p > p_prev) { | |
1069 | ccid3_hc_rx_send_feedback(sk); | |
1070 | return; | |
1071 | } | |
1072 | } | |
1073 | ||
91f0ebf7 | 1074 | static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) |
7c657876 ACM |
1075 | { |
1076 | struct dccp_sock *dp = dccp_sk(sk); | |
91f0ebf7 | 1077 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
7c657876 ACM |
1078 | |
1079 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
1080 | ||
a84ffe43 ACM |
1081 | if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && |
1082 | dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) | |
1083 | hcrx->ccid3hcrx_s = dp->dccps_packet_size; | |
7c657876 ACM |
1084 | else |
1085 | hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE; | |
1086 | ||
1087 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; | |
1088 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); | |
ae6706f0 | 1089 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
b0e56780 | 1090 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
954ee31f ACM |
1091 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
1092 | hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ | |
7c657876 ACM |
1093 | return 0; |
1094 | } | |
1095 | ||
1096 | static void ccid3_hc_rx_exit(struct sock *sk) | |
1097 | { | |
59725dc2 | 1098 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 1099 | |
59d203f9 | 1100 | BUG_ON(hcrx == NULL); |
7c657876 ACM |
1101 | |
1102 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); | |
1103 | ||
1104 | /* Empty packet history */ | |
8c60f3fa | 1105 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
7c657876 ACM |
1106 | |
1107 | /* Empty loss interval history */ | |
ae6706f0 | 1108 | dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); |
7c657876 ACM |
1109 | } |
1110 | ||
2babe1f6 ACM |
1111 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
1112 | { | |
59725dc2 | 1113 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
2babe1f6 | 1114 | |
59c2353d ACM |
1115 | /* Listen socks doesn't have a private CCID block */ |
1116 | if (sk->sk_state == DCCP_LISTEN) | |
1117 | return; | |
1118 | ||
59d203f9 | 1119 | BUG_ON(hcrx == NULL); |
2babe1f6 ACM |
1120 | |
1121 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; | |
1122 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; | |
1123 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; | |
1124 | } | |
1125 | ||
1126 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) | |
1127 | { | |
59725dc2 | 1128 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
2babe1f6 | 1129 | |
59c2353d ACM |
1130 | /* Listen socks doesn't have a private CCID block */ |
1131 | if (sk->sk_state == DCCP_LISTEN) | |
1132 | return; | |
1133 | ||
59d203f9 | 1134 | BUG_ON(hctx == NULL); |
2babe1f6 ACM |
1135 | |
1136 | info->tcpi_rto = hctx->ccid3hctx_t_rto; | |
1137 | info->tcpi_rtt = hctx->ccid3hctx_rtt; | |
1138 | } | |
1139 | ||
88f964db ACM |
1140 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
1141 | u32 __user *optval, int __user *optlen) | |
1142 | { | |
1143 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); | |
1144 | const void *val; | |
1145 | ||
1146 | /* Listen socks doesn't have a private CCID block */ | |
1147 | if (sk->sk_state == DCCP_LISTEN) | |
1148 | return -EINVAL; | |
1149 | ||
1150 | switch (optname) { | |
1151 | case DCCP_SOCKOPT_CCID_RX_INFO: | |
1152 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) | |
1153 | return -EINVAL; | |
1154 | len = sizeof(hcrx->ccid3hcrx_tfrc); | |
1155 | val = &hcrx->ccid3hcrx_tfrc; | |
1156 | break; | |
1157 | default: | |
1158 | return -ENOPROTOOPT; | |
1159 | } | |
1160 | ||
1161 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1162 | return -EFAULT; | |
1163 | ||
1164 | return 0; | |
1165 | } | |
1166 | ||
1167 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, | |
1168 | u32 __user *optval, int __user *optlen) | |
1169 | { | |
1170 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
1171 | const void *val; | |
1172 | ||
1173 | /* Listen socks doesn't have a private CCID block */ | |
1174 | if (sk->sk_state == DCCP_LISTEN) | |
1175 | return -EINVAL; | |
1176 | ||
1177 | switch (optname) { | |
1178 | case DCCP_SOCKOPT_CCID_TX_INFO: | |
1179 | if (len < sizeof(hctx->ccid3hctx_tfrc)) | |
1180 | return -EINVAL; | |
1181 | len = sizeof(hctx->ccid3hctx_tfrc); | |
1182 | val = &hctx->ccid3hctx_tfrc; | |
1183 | break; | |
1184 | default: | |
1185 | return -ENOPROTOOPT; | |
1186 | } | |
1187 | ||
1188 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1189 | return -EFAULT; | |
1190 | ||
1191 | return 0; | |
1192 | } | |
1193 | ||
91f0ebf7 | 1194 | static struct ccid_operations ccid3 = { |
3dd9a7c3 | 1195 | .ccid_id = DCCPC_CCID3, |
7c657876 ACM |
1196 | .ccid_name = "ccid3", |
1197 | .ccid_owner = THIS_MODULE, | |
91f0ebf7 | 1198 | .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), |
7c657876 ACM |
1199 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
1200 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, | |
1201 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, | |
1202 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, | |
1203 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, | |
1204 | .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, | |
1205 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, | |
91f0ebf7 | 1206 | .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), |
7c657876 ACM |
1207 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
1208 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, | |
1209 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, | |
1210 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, | |
2babe1f6 ACM |
1211 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
1212 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, | |
88f964db ACM |
1213 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
1214 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, | |
7c657876 ACM |
1215 | }; |
1216 | ||
56724aa4 | 1217 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
1218 | module_param(ccid3_debug, int, 0444); |
1219 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); | |
56724aa4 | 1220 | #endif |
7c657876 ACM |
1221 | |
1222 | static __init int ccid3_module_init(void) | |
1223 | { | |
8c60f3fa | 1224 | int rc = -ENOBUFS; |
7c657876 | 1225 | |
8c60f3fa ACM |
1226 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
1227 | if (ccid3_rx_hist == NULL) | |
7c657876 ACM |
1228 | goto out; |
1229 | ||
8c60f3fa ACM |
1230 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
1231 | if (ccid3_tx_hist == NULL) | |
1232 | goto out_free_rx; | |
7c657876 | 1233 | |
ae6706f0 ACM |
1234 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
1235 | if (ccid3_li_hist == NULL) | |
8c60f3fa | 1236 | goto out_free_tx; |
7c657876 ACM |
1237 | |
1238 | rc = ccid_register(&ccid3); | |
1239 | if (rc != 0) | |
1240 | goto out_free_loss_interval_history; | |
7c657876 ACM |
1241 | out: |
1242 | return rc; | |
8c60f3fa | 1243 | |
7c657876 | 1244 | out_free_loss_interval_history: |
ae6706f0 ACM |
1245 | dccp_li_hist_delete(ccid3_li_hist); |
1246 | ccid3_li_hist = NULL; | |
8c60f3fa ACM |
1247 | out_free_tx: |
1248 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1249 | ccid3_tx_hist = NULL; | |
1250 | out_free_rx: | |
1251 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1252 | ccid3_rx_hist = NULL; | |
7c657876 ACM |
1253 | goto out; |
1254 | } | |
1255 | module_init(ccid3_module_init); | |
1256 | ||
1257 | static __exit void ccid3_module_exit(void) | |
1258 | { | |
1259 | ccid_unregister(&ccid3); | |
1260 | ||
8c60f3fa ACM |
1261 | if (ccid3_tx_hist != NULL) { |
1262 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1263 | ccid3_tx_hist = NULL; | |
7c657876 | 1264 | } |
8c60f3fa ACM |
1265 | if (ccid3_rx_hist != NULL) { |
1266 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1267 | ccid3_rx_hist = NULL; | |
7c657876 | 1268 | } |
ae6706f0 ACM |
1269 | if (ccid3_li_hist != NULL) { |
1270 | dccp_li_hist_delete(ccid3_li_hist); | |
1271 | ccid3_li_hist = NULL; | |
7c657876 ACM |
1272 | } |
1273 | } | |
1274 | module_exit(ccid3_module_exit); | |
1275 | ||
e6bccd35 | 1276 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
1f2333ae | 1277 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
7c657876 ACM |
1278 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
1279 | MODULE_LICENSE("GPL"); | |
1280 | MODULE_ALIAS("net-dccp-ccid-3"); |