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Commit | Line | Data |
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7c657876 ACM |
1 | /* |
2 | * net/dccp/ccids/ccid3.c | |
3 | * | |
4 | * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand. | |
e6bccd35 | 5 | * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz> |
7c657876 ACM |
6 | * |
7 | * An implementation of the DCCP protocol | |
8 | * | |
9 | * This code has been developed by the University of Waikato WAND | |
10 | * research group. For further information please see http://www.wand.net.nz/ | |
7c657876 ACM |
11 | * |
12 | * This code also uses code from Lulea University, rereleased as GPL by its | |
13 | * authors: | |
14 | * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon | |
15 | * | |
16 | * Changes to meet Linux coding standards, to make it meet latest ccid3 draft | |
17 | * and to make it work as a loadable module in the DCCP stack written by | |
18 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br>. | |
19 | * | |
20 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
21 | * | |
22 | * This program is free software; you can redistribute it and/or modify | |
23 | * it under the terms of the GNU General Public License as published by | |
24 | * the Free Software Foundation; either version 2 of the License, or | |
25 | * (at your option) any later version. | |
26 | * | |
27 | * This program is distributed in the hope that it will be useful, | |
28 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
29 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
30 | * GNU General Public License for more details. | |
31 | * | |
32 | * You should have received a copy of the GNU General Public License | |
33 | * along with this program; if not, write to the Free Software | |
34 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
35 | */ | |
36 | ||
37 | #include "../ccid.h" | |
38 | #include "../dccp.h" | |
4524b259 | 39 | #include "lib/packet_history.h" |
ae6706f0 | 40 | #include "lib/loss_interval.h" |
36729c1a | 41 | #include "lib/tfrc.h" |
7c657876 ACM |
42 | #include "ccid3.h" |
43 | ||
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 | ||
cfc3c525 | 63 | static int ccid3_debug; |
7c657876 | 64 | |
cfc3c525 | 65 | #ifdef CCID3_DEBUG |
7c657876 ACM |
66 | #define ccid3_pr_debug(format, a...) \ |
67 | do { if (ccid3_debug) \ | |
68 | printk(KERN_DEBUG "%s: " format, __FUNCTION__, ##a); \ | |
69 | } while (0) | |
70 | #else | |
71 | #define ccid3_pr_debug(format, a...) | |
72 | #endif | |
73 | ||
a1d3a355 ACM |
74 | static struct dccp_tx_hist *ccid3_tx_hist; |
75 | static struct dccp_rx_hist *ccid3_rx_hist; | |
ae6706f0 | 76 | static struct dccp_li_hist *ccid3_li_hist; |
7c657876 | 77 | |
7c657876 ACM |
78 | /* TFRC sender states */ |
79 | enum ccid3_hc_tx_states { | |
80 | TFRC_SSTATE_NO_SENT = 1, | |
81 | TFRC_SSTATE_NO_FBACK, | |
82 | TFRC_SSTATE_FBACK, | |
83 | TFRC_SSTATE_TERM, | |
84 | }; | |
85 | ||
86 | #ifdef CCID3_DEBUG | |
87 | static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) | |
88 | { | |
89 | static char *ccid3_state_names[] = { | |
90 | [TFRC_SSTATE_NO_SENT] = "NO_SENT", | |
91 | [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", | |
92 | [TFRC_SSTATE_FBACK] = "FBACK", | |
93 | [TFRC_SSTATE_TERM] = "TERM", | |
94 | }; | |
95 | ||
96 | return ccid3_state_names[state]; | |
97 | } | |
98 | #endif | |
99 | ||
c25a18ba ACM |
100 | static void ccid3_hc_tx_set_state(struct sock *sk, |
101 | enum ccid3_hc_tx_states state) | |
7c657876 | 102 | { |
59725dc2 | 103 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 ACM |
104 | enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; |
105 | ||
106 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
107 | dccp_role(sk), sk, ccid3_tx_state_name(oldstate), |
108 | ccid3_tx_state_name(state)); | |
7c657876 ACM |
109 | WARN_ON(state == oldstate); |
110 | hctx->ccid3hctx_state = state; | |
111 | } | |
112 | ||
7c657876 ACM |
113 | /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */ |
114 | static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock *hctx) | |
115 | { | |
6b5e633a ACM |
116 | /* |
117 | * If no feedback spec says t_ipi is 1 second (set elsewhere and then | |
118 | * doubles after every no feedback timer (separate function) | |
119 | */ | |
120 | if (hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK) | |
121 | hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s, | |
122 | hctx->ccid3hctx_x); | |
7c657876 ACM |
123 | } |
124 | ||
125 | /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ | |
126 | static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx) | |
127 | { | |
1f2333ae ACM |
128 | hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, |
129 | TFRC_OPSYS_HALF_TIME_GRAN); | |
7c657876 ACM |
130 | } |
131 | ||
132 | /* | |
133 | * Update X by | |
134 | * If (p > 0) | |
135 | * x_calc = calcX(s, R, p); | |
136 | * X = max(min(X_calc, 2 * X_recv), s / t_mbi); | |
137 | * Else | |
138 | * If (now - tld >= R) | |
139 | * X = max(min(2 * X, 2 * X_recv), s / R); | |
140 | * tld = now; | |
141 | */ | |
142 | static void ccid3_hc_tx_update_x(struct sock *sk) | |
143 | { | |
59725dc2 | 144 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 145 | |
1f2333ae ACM |
146 | /* To avoid large error in calcX */ |
147 | if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { | |
36729c1a ACM |
148 | hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, |
149 | hctx->ccid3hctx_rtt, | |
150 | hctx->ccid3hctx_p); | |
1f2333ae ACM |
151 | hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, |
152 | 2 * hctx->ccid3hctx_x_recv), | |
153 | (hctx->ccid3hctx_s / | |
154 | TFRC_MAX_BACK_OFF_TIME)); | |
b6ee3d4a ACM |
155 | } else { |
156 | struct timeval now; | |
157 | ||
b0e56780 | 158 | dccp_timestamp(sk, &now); |
b6ee3d4a ACM |
159 | if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >= |
160 | hctx->ccid3hctx_rtt) { | |
6b5e633a ACM |
161 | hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv, |
162 | hctx->ccid3hctx_x) * 2, | |
163 | usecs_div(hctx->ccid3hctx_s, | |
164 | hctx->ccid3hctx_rtt)); | |
b6ee3d4a ACM |
165 | hctx->ccid3hctx_t_ld = now; |
166 | } | |
7c657876 | 167 | } |
7c657876 ACM |
168 | } |
169 | ||
170 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) | |
171 | { | |
172 | struct sock *sk = (struct sock *)data; | |
7c657876 | 173 | unsigned long next_tmout = 0; |
59725dc2 | 174 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 ACM |
175 | |
176 | bh_lock_sock(sk); | |
177 | if (sock_owned_by_user(sk)) { | |
178 | /* Try again later. */ | |
179 | /* XXX: set some sensible MIB */ | |
1f2333ae ACM |
180 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
181 | jiffies + HZ / 5); | |
7c657876 ACM |
182 | goto out; |
183 | } | |
184 | ||
185 | ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, | |
186 | ccid3_tx_state_name(hctx->ccid3hctx_state)); | |
187 | ||
7c657876 ACM |
188 | switch (hctx->ccid3hctx_state) { |
189 | case TFRC_SSTATE_TERM: | |
190 | goto out; | |
191 | case TFRC_SSTATE_NO_FBACK: | |
192 | /* Halve send rate */ | |
193 | hctx->ccid3hctx_x /= 2; | |
6b5e633a ACM |
194 | if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / |
195 | TFRC_MAX_BACK_OFF_TIME)) | |
1f2333ae ACM |
196 | hctx->ccid3hctx_x = (hctx->ccid3hctx_s / |
197 | TFRC_MAX_BACK_OFF_TIME); | |
7c657876 | 198 | |
1f2333ae ACM |
199 | ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " |
200 | "bytes/s\n", | |
201 | dccp_role(sk), sk, | |
202 | ccid3_tx_state_name(hctx->ccid3hctx_state), | |
7c657876 | 203 | hctx->ccid3hctx_x); |
6b5e633a ACM |
204 | next_tmout = max_t(u32, 2 * usecs_div(hctx->ccid3hctx_s, |
205 | hctx->ccid3hctx_x), | |
1f2333ae | 206 | TFRC_INITIAL_TIMEOUT); |
1f2333ae ACM |
207 | /* |
208 | * FIXME - not sure above calculation is correct. See section | |
209 | * 5 of CCID3 11 should adjust tx_t_ipi and double that to | |
210 | * achieve it really | |
211 | */ | |
7c657876 ACM |
212 | break; |
213 | case TFRC_SSTATE_FBACK: | |
1f2333ae ACM |
214 | /* |
215 | * Check if IDLE since last timeout and recv rate is less than | |
216 | * 4 packets per RTT | |
217 | */ | |
1f2333ae | 218 | if (!hctx->ccid3hctx_idle || |
6b5e633a ACM |
219 | (hctx->ccid3hctx_x_recv >= |
220 | 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { | |
1f2333ae ACM |
221 | ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", |
222 | dccp_role(sk), sk, | |
7c657876 ACM |
223 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
224 | /* Halve sending rate */ | |
225 | ||
226 | /* If (X_calc > 2 * X_recv) | |
227 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); | |
228 | * Else | |
229 | * X_recv = X_calc / 4; | |
230 | */ | |
1f2333ae ACM |
231 | BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && |
232 | hctx->ccid3hctx_x_calc == 0); | |
7c657876 ACM |
233 | |
234 | /* check also if p is zero -> x_calc is infinity? */ | |
235 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P || | |
236 | hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) | |
237 | hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, | |
238 | hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME)); | |
239 | else | |
240 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; | |
241 | ||
242 | /* Update sending rate */ | |
243 | ccid3_hc_tx_update_x(sk); | |
244 | } | |
6b5e633a ACM |
245 | /* |
246 | * Schedule no feedback timer to expire in | |
247 | * max(4 * R, 2 * s / X) | |
248 | */ | |
c68e64cf | 249 | next_tmout = max_t(u32, hctx->ccid3hctx_t_rto, |
6b5e633a ACM |
250 | 2 * usecs_div(hctx->ccid3hctx_s, |
251 | hctx->ccid3hctx_x)); | |
7c657876 ACM |
252 | break; |
253 | default: | |
254 | printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", | |
255 | __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); | |
256 | dump_stack(); | |
257 | goto out; | |
258 | } | |
259 | ||
260 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
1f2333ae | 261 | jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); |
7c657876 ACM |
262 | hctx->ccid3hctx_idle = 1; |
263 | out: | |
264 | bh_unlock_sock(sk); | |
265 | sock_put(sk); | |
266 | } | |
267 | ||
27258ee5 ACM |
268 | static int ccid3_hc_tx_send_packet(struct sock *sk, |
269 | struct sk_buff *skb, int len) | |
7c657876 ACM |
270 | { |
271 | struct dccp_sock *dp = dccp_sk(sk); | |
59725dc2 | 272 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
8c60f3fa | 273 | struct dccp_tx_hist_entry *new_packet; |
7c657876 | 274 | struct timeval now; |
27258ee5 | 275 | long delay; |
7c657876 ACM |
276 | int rc = -ENOTCONN; |
277 | ||
59d203f9 | 278 | BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM); |
1f2333ae | 279 | |
59d203f9 | 280 | /* Check if pure ACK or Terminating*/ |
7c657876 | 281 | /* |
1f2333ae ACM |
282 | * XXX: We only call this function for DATA and DATAACK, on, these |
283 | * packets can have zero length, but why the comment about "pure ACK"? | |
7c657876 | 284 | */ |
59d203f9 | 285 | if (unlikely(len == 0)) |
7c657876 ACM |
286 | goto out; |
287 | ||
288 | /* See if last packet allocated was not sent */ | |
8c60f3fa ACM |
289 | new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
290 | if (new_packet == NULL || new_packet->dccphtx_sent) { | |
1f2333ae ACM |
291 | new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, |
292 | SLAB_ATOMIC); | |
7c657876 ACM |
293 | |
294 | rc = -ENOBUFS; | |
59d203f9 ACM |
295 | if (unlikely(new_packet == NULL)) { |
296 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, not enough " | |
297 | "mem to add to history, send refused\n", | |
298 | __FUNCTION__, dccp_role(sk), sk); | |
7c657876 ACM |
299 | goto out; |
300 | } | |
301 | ||
8c60f3fa | 302 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); |
7c657876 ACM |
303 | } |
304 | ||
b0e56780 | 305 | dccp_timestamp(sk, &now); |
7c657876 ACM |
306 | |
307 | switch (hctx->ccid3hctx_state) { | |
308 | case TFRC_SSTATE_NO_SENT: | |
1f2333ae ACM |
309 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
310 | jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); | |
7c657876 ACM |
311 | hctx->ccid3hctx_last_win_count = 0; |
312 | hctx->ccid3hctx_t_last_win_count = now; | |
313 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); | |
d7e0fb98 | 314 | hctx->ccid3hctx_t_ipi = TFRC_INITIAL_IPI; |
7c657876 ACM |
315 | |
316 | /* Set nominal send time for initial packet */ | |
317 | hctx->ccid3hctx_t_nom = now; | |
b6ee3d4a ACM |
318 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, |
319 | hctx->ccid3hctx_t_ipi); | |
7c657876 ACM |
320 | ccid3_calc_new_delta(hctx); |
321 | rc = 0; | |
322 | break; | |
323 | case TFRC_SSTATE_NO_FBACK: | |
324 | case TFRC_SSTATE_FBACK: | |
b6ee3d4a ACM |
325 | delay = (timeval_delta(&now, &hctx->ccid3hctx_t_nom) - |
326 | hctx->ccid3hctx_delta); | |
27258ee5 | 327 | delay /= -1000; |
7c657876 | 328 | /* divide by -1000 is to convert to ms and get sign right */ |
d6809c12 | 329 | rc = delay > 0 ? delay : 0; |
7c657876 ACM |
330 | break; |
331 | default: | |
332 | printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", | |
333 | __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); | |
334 | dump_stack(); | |
335 | rc = -EINVAL; | |
336 | break; | |
337 | } | |
338 | ||
339 | /* Can we send? if so add options and add to packet history */ | |
507d37cf ACM |
340 | if (rc == 0) { |
341 | dp->dccps_hc_tx_insert_options = 1; | |
c1734376 | 342 | new_packet->dccphtx_ccval = |
8c60f3fa ACM |
343 | DCCP_SKB_CB(skb)->dccpd_ccval = |
344 | hctx->ccid3hctx_last_win_count; | |
66a377c5 IM |
345 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, |
346 | hctx->ccid3hctx_t_ipi); | |
507d37cf | 347 | } |
7c657876 ACM |
348 | out: |
349 | return rc; | |
350 | } | |
351 | ||
352 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len) | |
353 | { | |
59725dc2 ACM |
354 | const struct dccp_sock *dp = dccp_sk(sk); |
355 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 ACM |
356 | struct timeval now; |
357 | ||
59d203f9 | 358 | BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM); |
7c657876 | 359 | |
b0e56780 | 360 | dccp_timestamp(sk, &now); |
7c657876 ACM |
361 | |
362 | /* check if we have sent a data packet */ | |
363 | if (len > 0) { | |
364 | unsigned long quarter_rtt; | |
8c60f3fa | 365 | struct dccp_tx_hist_entry *packet; |
7c657876 | 366 | |
8c60f3fa | 367 | packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
59d203f9 ACM |
368 | if (unlikely(packet == NULL)) { |
369 | LIMIT_NETDEBUG(KERN_WARNING "%s: packet doesn't " | |
370 | "exists in history!\n", __FUNCTION__); | |
7c657876 ACM |
371 | return; |
372 | } | |
59d203f9 ACM |
373 | if (unlikely(packet->dccphtx_sent)) { |
374 | LIMIT_NETDEBUG(KERN_WARNING "%s: no unsent packet in " | |
375 | "history!\n", __FUNCTION__); | |
7c657876 ACM |
376 | return; |
377 | } | |
8c60f3fa ACM |
378 | packet->dccphtx_tstamp = now; |
379 | packet->dccphtx_seqno = dp->dccps_gss; | |
7c657876 | 380 | /* |
1f2333ae ACM |
381 | * Check if win_count have changed |
382 | * Algorithm in "8.1. Window Counter Valuer" in | |
383 | * draft-ietf-dccp-ccid3-11.txt | |
7c657876 | 384 | */ |
6b5e633a ACM |
385 | quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); |
386 | if (likely(hctx->ccid3hctx_rtt > 8)) | |
387 | quarter_rtt /= hctx->ccid3hctx_rtt / 4; | |
388 | ||
7c657876 ACM |
389 | if (quarter_rtt > 0) { |
390 | hctx->ccid3hctx_t_last_win_count = now; | |
391 | hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + | |
392 | min_t(unsigned long, quarter_rtt, 5)) % 16; | |
1f2333ae ACM |
393 | ccid3_pr_debug("%s, sk=%p, window changed from " |
394 | "%u to %u!\n", | |
7c657876 | 395 | dccp_role(sk), sk, |
c1734376 | 396 | packet->dccphtx_ccval, |
7c657876 ACM |
397 | hctx->ccid3hctx_last_win_count); |
398 | } | |
1f2333ae | 399 | |
7c657876 | 400 | hctx->ccid3hctx_idle = 0; |
c1734376 | 401 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; |
8c60f3fa | 402 | packet->dccphtx_sent = 1; |
7c657876 ACM |
403 | } else |
404 | ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", | |
405 | dccp_role(sk), sk, dp->dccps_gss); | |
406 | ||
407 | switch (hctx->ccid3hctx_state) { | |
408 | case TFRC_SSTATE_NO_SENT: | |
409 | /* if first wasn't pure ack */ | |
410 | if (len != 0) | |
1f2333ae ACM |
411 | printk(KERN_CRIT "%s: %s, First packet sent is noted " |
412 | "as a data packet\n", | |
7c657876 ACM |
413 | __FUNCTION__, dccp_role(sk)); |
414 | return; | |
415 | case TFRC_SSTATE_NO_FBACK: | |
416 | case TFRC_SSTATE_FBACK: | |
417 | if (len > 0) { | |
66a377c5 IM |
418 | timeval_sub_usecs(&hctx->ccid3hctx_t_nom, |
419 | hctx->ccid3hctx_t_ipi); | |
7c657876 ACM |
420 | ccid3_calc_new_t_ipi(hctx); |
421 | ccid3_calc_new_delta(hctx); | |
b6ee3d4a ACM |
422 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, |
423 | hctx->ccid3hctx_t_ipi); | |
7c657876 ACM |
424 | } |
425 | break; | |
426 | default: | |
427 | printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", | |
428 | __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); | |
429 | dump_stack(); | |
430 | break; | |
431 | } | |
432 | } | |
433 | ||
434 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) | |
435 | { | |
59725dc2 ACM |
436 | const struct dccp_sock *dp = dccp_sk(sk); |
437 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 | 438 | struct ccid3_options_received *opt_recv; |
8c60f3fa | 439 | struct dccp_tx_hist_entry *packet; |
b0e56780 | 440 | struct timeval now; |
7c657876 | 441 | unsigned long next_tmout; |
1bc09869 | 442 | u32 t_elapsed; |
7c657876 ACM |
443 | u32 pinv; |
444 | u32 x_recv; | |
445 | u32 r_sample; | |
1f2333ae | 446 | |
59d203f9 | 447 | BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM); |
7c657876 ACM |
448 | |
449 | /* we are only interested in ACKs */ | |
450 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || | |
451 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) | |
452 | return; | |
453 | ||
454 | opt_recv = &hctx->ccid3hctx_options_received; | |
455 | ||
1a28599a | 456 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; |
7c657876 ACM |
457 | x_recv = opt_recv->ccid3or_receive_rate; |
458 | pinv = opt_recv->ccid3or_loss_event_rate; | |
459 | ||
460 | switch (hctx->ccid3hctx_state) { | |
461 | case TFRC_SSTATE_NO_SENT: | |
462 | /* FIXME: what to do here? */ | |
463 | return; | |
464 | case TFRC_SSTATE_NO_FBACK: | |
465 | case TFRC_SSTATE_FBACK: | |
466 | /* Calculate new round trip sample by | |
467 | * R_sample = (now - t_recvdata) - t_delay */ | |
468 | /* get t_recvdata from history */ | |
8c60f3fa ACM |
469 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
470 | DCCP_SKB_CB(skb)->dccpd_ack_seq); | |
59d203f9 ACM |
471 | if (unlikely(packet == NULL)) { |
472 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, seqno " | |
473 | "%llu(%s) does't exist in history!\n", | |
474 | __FUNCTION__, dccp_role(sk), sk, | |
475 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, | |
476 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); | |
7c657876 ACM |
477 | return; |
478 | } | |
479 | ||
480 | /* Update RTT */ | |
b0e56780 ACM |
481 | dccp_timestamp(sk, &now); |
482 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); | |
1a28599a | 483 | if (unlikely(r_sample <= t_elapsed)) |
59d203f9 ACM |
484 | LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, " |
485 | "t_elapsed=%uus\n", | |
1a28599a ACM |
486 | __FUNCTION__, r_sample, t_elapsed); |
487 | else | |
488 | r_sample -= t_elapsed; | |
7c657876 ACM |
489 | |
490 | /* Update RTT estimate by | |
491 | * If (No feedback recv) | |
492 | * R = R_sample; | |
493 | * Else | |
494 | * R = q * R + (1 - q) * R_sample; | |
495 | * | |
496 | * q is a constant, RFC 3448 recomments 0.9 | |
497 | */ | |
498 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { | |
499 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); | |
500 | hctx->ccid3hctx_rtt = r_sample; | |
501 | } else | |
1f2333ae ACM |
502 | hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + |
503 | r_sample / 10; | |
7c657876 | 504 | |
1f2333ae ACM |
505 | ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " |
506 | "r_sample=%us\n", dccp_role(sk), sk, | |
507 | hctx->ccid3hctx_rtt, r_sample); | |
7c657876 ACM |
508 | |
509 | /* Update timeout interval */ | |
c68e64cf ACM |
510 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
511 | USEC_PER_SEC); | |
7c657876 ACM |
512 | |
513 | /* Update receive rate */ | |
1f2333ae | 514 | hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ |
7c657876 ACM |
515 | |
516 | /* Update loss event rate */ | |
517 | if (pinv == ~0 || pinv == 0) | |
518 | hctx->ccid3hctx_p = 0; | |
519 | else { | |
520 | hctx->ccid3hctx_p = 1000000 / pinv; | |
521 | ||
522 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { | |
523 | hctx->ccid3hctx_p = TFRC_SMALLEST_P; | |
1f2333ae ACM |
524 | ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", |
525 | dccp_role(sk), sk); | |
7c657876 ACM |
526 | } |
527 | } | |
528 | ||
529 | /* unschedule no feedback timer */ | |
530 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
531 | ||
532 | /* Update sending rate */ | |
533 | ccid3_hc_tx_update_x(sk); | |
534 | ||
535 | /* Update next send time */ | |
b6ee3d4a ACM |
536 | timeval_sub_usecs(&hctx->ccid3hctx_t_nom, |
537 | hctx->ccid3hctx_t_ipi); | |
7c657876 | 538 | ccid3_calc_new_t_ipi(hctx); |
b6ee3d4a ACM |
539 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, |
540 | hctx->ccid3hctx_t_ipi); | |
7c657876 ACM |
541 | ccid3_calc_new_delta(hctx); |
542 | ||
543 | /* remove all packets older than the one acked from history */ | |
8c60f3fa ACM |
544 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
545 | &hctx->ccid3hctx_hist, packet); | |
c530cfb1 ACM |
546 | /* |
547 | * As we have calculated new ipi, delta, t_nom it is possible that | |
548 | * we now can send a packet, so wake up dccp_wait_for_ccids. | |
549 | */ | |
550 | sk->sk_write_space(sk); | |
8c60f3fa | 551 | |
1f2333ae ACM |
552 | /* |
553 | * Schedule no feedback timer to expire in | |
554 | * max(4 * R, 2 * s / X) | |
555 | */ | |
c68e64cf | 556 | next_tmout = max(hctx->ccid3hctx_t_rto, |
6b5e633a ACM |
557 | 2 * usecs_div(hctx->ccid3hctx_s, |
558 | hctx->ccid3hctx_x)); | |
559 | ||
1f2333ae ACM |
560 | ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " |
561 | "expire in %lu jiffies (%luus)\n", | |
562 | dccp_role(sk), sk, | |
563 | usecs_to_jiffies(next_tmout), next_tmout); | |
7c657876 ACM |
564 | |
565 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
1f2333ae | 566 | jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); |
7c657876 ACM |
567 | |
568 | /* set idle flag */ | |
569 | hctx->ccid3hctx_idle = 1; | |
570 | break; | |
571 | default: | |
572 | printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", | |
573 | __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); | |
574 | dump_stack(); | |
575 | break; | |
576 | } | |
577 | } | |
578 | ||
2d0817d1 | 579 | static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 580 | { |
59d203f9 | 581 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 582 | |
59d203f9 ACM |
583 | BUG_ON(hctx == NULL); |
584 | ||
2d0817d1 ACM |
585 | if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) |
586 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; | |
587 | return 0; | |
7c657876 ACM |
588 | } |
589 | ||
590 | static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, | |
1f2333ae ACM |
591 | unsigned char len, u16 idx, |
592 | unsigned char *value) | |
7c657876 ACM |
593 | { |
594 | int rc = 0; | |
59725dc2 ACM |
595 | const struct dccp_sock *dp = dccp_sk(sk); |
596 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 ACM |
597 | struct ccid3_options_received *opt_recv; |
598 | ||
59d203f9 | 599 | BUG_ON(hctx == NULL); |
7c657876 ACM |
600 | |
601 | opt_recv = &hctx->ccid3hctx_options_received; | |
602 | ||
603 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { | |
604 | opt_recv->ccid3or_seqno = dp->dccps_gsr; | |
605 | opt_recv->ccid3or_loss_event_rate = ~0; | |
606 | opt_recv->ccid3or_loss_intervals_idx = 0; | |
607 | opt_recv->ccid3or_loss_intervals_len = 0; | |
608 | opt_recv->ccid3or_receive_rate = 0; | |
609 | } | |
610 | ||
611 | switch (option) { | |
612 | case TFRC_OPT_LOSS_EVENT_RATE: | |
59d203f9 ACM |
613 | if (unlikely(len != 4)) { |
614 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid " | |
615 | "len for TFRC_OPT_LOSS_EVENT_RATE\n", | |
616 | __FUNCTION__, dccp_role(sk), sk); | |
7c657876 ACM |
617 | rc = -EINVAL; |
618 | } else { | |
60fe62e7 | 619 | opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
620 | ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", |
621 | dccp_role(sk), sk, | |
622 | opt_recv->ccid3or_loss_event_rate); | |
623 | } | |
624 | break; | |
625 | case TFRC_OPT_LOSS_INTERVALS: | |
626 | opt_recv->ccid3or_loss_intervals_idx = idx; | |
627 | opt_recv->ccid3or_loss_intervals_len = len; | |
628 | ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", | |
629 | dccp_role(sk), sk, | |
630 | opt_recv->ccid3or_loss_intervals_idx, | |
631 | opt_recv->ccid3or_loss_intervals_len); | |
632 | break; | |
633 | case TFRC_OPT_RECEIVE_RATE: | |
59d203f9 ACM |
634 | if (unlikely(len != 4)) { |
635 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid " | |
636 | "len for TFRC_OPT_RECEIVE_RATE\n", | |
637 | __FUNCTION__, dccp_role(sk), sk); | |
7c657876 ACM |
638 | rc = -EINVAL; |
639 | } else { | |
60fe62e7 | 640 | opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
641 | ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", |
642 | dccp_role(sk), sk, | |
643 | opt_recv->ccid3or_receive_rate); | |
644 | } | |
645 | break; | |
646 | } | |
647 | ||
648 | return rc; | |
649 | } | |
650 | ||
91f0ebf7 | 651 | static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) |
7c657876 ACM |
652 | { |
653 | struct dccp_sock *dp = dccp_sk(sk); | |
91f0ebf7 | 654 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
7c657876 | 655 | |
a84ffe43 ACM |
656 | if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && |
657 | dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) | |
658 | hctx->ccid3hctx_s = dp->dccps_packet_size; | |
7c657876 ACM |
659 | else |
660 | hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE; | |
661 | ||
1f2333ae ACM |
662 | /* Set transmission rate to 1 packet per second */ |
663 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; | |
c68e64cf | 664 | hctx->ccid3hctx_t_rto = USEC_PER_SEC; |
7c657876 ACM |
665 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
666 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); | |
aa5d7df3 ACM |
667 | |
668 | hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; | |
669 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; | |
7c657876 ACM |
670 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
671 | ||
672 | return 0; | |
673 | } | |
674 | ||
675 | static void ccid3_hc_tx_exit(struct sock *sk) | |
676 | { | |
59725dc2 | 677 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 678 | |
7c657876 ACM |
679 | BUG_ON(hctx == NULL); |
680 | ||
681 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); | |
682 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
683 | ||
684 | /* Empty packet history */ | |
8c60f3fa | 685 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
7c657876 ACM |
686 | } |
687 | ||
688 | /* | |
689 | * RX Half Connection methods | |
690 | */ | |
691 | ||
692 | /* TFRC receiver states */ | |
693 | enum ccid3_hc_rx_states { | |
694 | TFRC_RSTATE_NO_DATA = 1, | |
695 | TFRC_RSTATE_DATA, | |
696 | TFRC_RSTATE_TERM = 127, | |
697 | }; | |
698 | ||
699 | #ifdef CCID3_DEBUG | |
700 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) | |
701 | { | |
702 | static char *ccid3_rx_state_names[] = { | |
703 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", | |
704 | [TFRC_RSTATE_DATA] = "DATA", | |
705 | [TFRC_RSTATE_TERM] = "TERM", | |
706 | }; | |
707 | ||
708 | return ccid3_rx_state_names[state]; | |
709 | } | |
710 | #endif | |
711 | ||
c25a18ba ACM |
712 | static void ccid3_hc_rx_set_state(struct sock *sk, |
713 | enum ccid3_hc_rx_states state) | |
7c657876 | 714 | { |
59725dc2 | 715 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 ACM |
716 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
717 | ||
718 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
719 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
720 | ccid3_rx_state_name(state)); | |
7c657876 ACM |
721 | WARN_ON(state == oldstate); |
722 | hcrx->ccid3hcrx_state = state; | |
723 | } | |
724 | ||
7c657876 ACM |
725 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
726 | { | |
59725dc2 | 727 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 728 | struct dccp_sock *dp = dccp_sk(sk); |
8c60f3fa | 729 | struct dccp_rx_hist_entry *packet; |
b6ee3d4a | 730 | struct timeval now; |
7c657876 ACM |
731 | |
732 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
733 | ||
b0e56780 | 734 | dccp_timestamp(sk, &now); |
b6ee3d4a | 735 | |
7c657876 ACM |
736 | switch (hcrx->ccid3hcrx_state) { |
737 | case TFRC_RSTATE_NO_DATA: | |
738 | hcrx->ccid3hcrx_x_recv = 0; | |
739 | break; | |
740 | case TFRC_RSTATE_DATA: { | |
b6ee3d4a ACM |
741 | const u32 delta = timeval_delta(&now, |
742 | &hcrx->ccid3hcrx_tstamp_last_feedback); | |
27ae543e ACM |
743 | hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, |
744 | delta); | |
7c657876 ACM |
745 | } |
746 | break; | |
747 | default: | |
748 | printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", | |
749 | __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state); | |
750 | dump_stack(); | |
751 | return; | |
752 | } | |
753 | ||
8c60f3fa | 754 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
59d203f9 ACM |
755 | if (unlikely(packet == NULL)) { |
756 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, no data packet " | |
757 | "in history!\n", | |
758 | __FUNCTION__, dccp_role(sk), sk); | |
7c657876 ACM |
759 | return; |
760 | } | |
761 | ||
b6ee3d4a | 762 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
66a377c5 | 763 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
7c657876 ACM |
764 | hcrx->ccid3hcrx_bytes_recv = 0; |
765 | ||
766 | /* Convert to multiples of 10us */ | |
b6ee3d4a ACM |
767 | hcrx->ccid3hcrx_elapsed_time = |
768 | timeval_delta(&now, &packet->dccphrx_tstamp) / 10; | |
7c657876 ACM |
769 | if (hcrx->ccid3hcrx_p == 0) |
770 | hcrx->ccid3hcrx_pinv = ~0; | |
771 | else | |
772 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; | |
507d37cf | 773 | dp->dccps_hc_rx_insert_options = 1; |
7c657876 ACM |
774 | dccp_send_ack(sk); |
775 | } | |
776 | ||
2d0817d1 | 777 | static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 778 | { |
59d203f9 | 779 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
60fe62e7 | 780 | __be32 x_recv, pinv; |
7c657876 | 781 | |
59d203f9 ACM |
782 | BUG_ON(hcrx == NULL); |
783 | ||
784 | if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) | |
2d0817d1 | 785 | return 0; |
7c657876 | 786 | |
66a377c5 | 787 | DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; |
4fded33b ACM |
788 | |
789 | if (dccp_packet_without_ack(skb)) | |
2d0817d1 ACM |
790 | return 0; |
791 | ||
4fded33b ACM |
792 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
793 | pinv = htonl(hcrx->ccid3hcrx_pinv); | |
2d0817d1 ACM |
794 | |
795 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && | |
796 | dccp_insert_option_elapsed_time(sk, skb, | |
797 | hcrx->ccid3hcrx_elapsed_time)) || | |
798 | dccp_insert_option_timestamp(sk, skb) || | |
799 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, | |
800 | &pinv, sizeof(pinv)) || | |
801 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, | |
802 | &x_recv, sizeof(x_recv))) | |
803 | return -1; | |
804 | ||
805 | return 0; | |
7c657876 ACM |
806 | } |
807 | ||
7c657876 ACM |
808 | /* calculate first loss interval |
809 | * | |
810 | * returns estimated loss interval in usecs */ | |
811 | ||
812 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) | |
813 | { | |
59725dc2 | 814 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
8c60f3fa | 815 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
7c657876 | 816 | u32 rtt, delta, x_recv, fval, p, tmp2; |
b6ee3d4a | 817 | struct timeval tstamp = { 0, }; |
7c657876 ACM |
818 | int interval = 0; |
819 | int win_count = 0; | |
820 | int step = 0; | |
821 | u64 tmp1; | |
822 | ||
8c60f3fa ACM |
823 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
824 | dccphrx_node) { | |
825 | if (dccp_rx_hist_entry_data_packet(entry)) { | |
7c657876 ACM |
826 | tail = entry; |
827 | ||
828 | switch (step) { | |
829 | case 0: | |
8c60f3fa | 830 | tstamp = entry->dccphrx_tstamp; |
c1734376 | 831 | win_count = entry->dccphrx_ccval; |
7c657876 ACM |
832 | step = 1; |
833 | break; | |
834 | case 1: | |
c1734376 | 835 | interval = win_count - entry->dccphrx_ccval; |
7c657876 ACM |
836 | if (interval < 0) |
837 | interval += TFRC_WIN_COUNT_LIMIT; | |
838 | if (interval > 4) | |
839 | goto found; | |
840 | break; | |
841 | } | |
842 | } | |
843 | } | |
844 | ||
59d203f9 ACM |
845 | if (unlikely(step == 0)) { |
846 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, packet history " | |
847 | "contains no data packets!\n", | |
848 | __FUNCTION__, dccp_role(sk), sk); | |
7c657876 ACM |
849 | return ~0; |
850 | } | |
851 | ||
59d203f9 ACM |
852 | if (unlikely(interval == 0)) { |
853 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Could not find a " | |
854 | "win_count interval > 0. Defaulting to 1\n", | |
855 | __FUNCTION__, dccp_role(sk), sk); | |
7c657876 ACM |
856 | interval = 1; |
857 | } | |
858 | found: | |
66a377c5 IM |
859 | if (!tail) { |
860 | LIMIT_NETDEBUG(KERN_WARNING "%s: tail is null\n", | |
861 | __FUNCTION__); | |
862 | return ~0; | |
863 | } | |
b6ee3d4a | 864 | rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; |
7c657876 ACM |
865 | ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", |
866 | dccp_role(sk), sk, rtt); | |
867 | if (rtt == 0) | |
868 | rtt = 1; | |
869 | ||
b0e56780 ACM |
870 | dccp_timestamp(sk, &tstamp); |
871 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); | |
872 | x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); | |
7c657876 | 873 | |
66a377c5 IM |
874 | if (x_recv == 0) |
875 | x_recv = hcrx->ccid3hcrx_x_recv; | |
876 | ||
7c657876 ACM |
877 | tmp1 = (u64)x_recv * (u64)rtt; |
878 | do_div(tmp1,10000000); | |
879 | tmp2 = (u32)tmp1; | |
66a377c5 IM |
880 | |
881 | if (!tmp2) { | |
882 | LIMIT_NETDEBUG(KERN_WARNING "tmp2 = 0 " | |
883 | "%s: x_recv = %u, rtt =%u\n", | |
884 | __FUNCTION__, x_recv, rtt); | |
885 | return ~0; | |
886 | } | |
887 | ||
7c657876 ACM |
888 | fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; |
889 | /* do not alter order above or you will get overflow on 32 bit */ | |
36729c1a | 890 | p = tfrc_calc_x_reverse_lookup(fval); |
1f2333ae ACM |
891 | ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " |
892 | "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); | |
7c657876 ACM |
893 | |
894 | if (p == 0) | |
895 | return ~0; | |
896 | else | |
897 | return 1000000 / p; | |
898 | } | |
899 | ||
900 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) | |
901 | { | |
59725dc2 | 902 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
fc747e82 | 903 | struct dccp_li_hist_entry *head; |
66a377c5 | 904 | u64 seq_temp; |
7c657876 | 905 | |
66a377c5 IM |
906 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
907 | if (!dccp_li_hist_interval_new(ccid3_li_hist, | |
908 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) | |
909 | return; | |
7c657876 | 910 | |
fc747e82 IM |
911 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
912 | struct dccp_li_hist_entry, dccplih_node); | |
913 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); | |
66a377c5 IM |
914 | } else { |
915 | struct dccp_li_hist_entry *entry; | |
916 | struct list_head *tail; | |
917 | ||
fc747e82 IM |
918 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
919 | struct dccp_li_hist_entry, dccplih_node); | |
66a377c5 IM |
920 | /* FIXME win count check removed as was wrong */ |
921 | /* should make this check with receive history */ | |
922 | /* and compare there as per section 10.2 of RFC4342 */ | |
923 | ||
924 | /* new loss event detected */ | |
925 | /* calculate last interval length */ | |
926 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); | |
927 | entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); | |
928 | ||
929 | if (entry == NULL) { | |
930 | printk(KERN_CRIT "%s: out of memory\n",__FUNCTION__); | |
931 | dump_stack(); | |
ae6706f0 | 932 | return; |
66a377c5 IM |
933 | } |
934 | ||
935 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); | |
936 | ||
937 | tail = hcrx->ccid3hcrx_li_hist.prev; | |
938 | list_del(tail); | |
939 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); | |
940 | ||
941 | /* Create the newest interval */ | |
942 | entry->dccplih_seqno = seq_loss; | |
943 | entry->dccplih_interval = seq_temp; | |
944 | entry->dccplih_win_count = win_loss; | |
945 | } | |
7c657876 ACM |
946 | } |
947 | ||
66a377c5 IM |
948 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
949 | struct dccp_rx_hist_entry *packet) | |
7c657876 | 950 | { |
59725dc2 | 951 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
66a377c5 IM |
952 | struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
953 | u64 seqno = packet->dccphrx_seqno; | |
954 | u64 tmp_seqno; | |
955 | int loss = 0; | |
956 | u8 ccval; | |
957 | ||
958 | ||
959 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
960 | ||
961 | if (!rx_hist || | |
962 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
963 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
964 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
965 | goto detect_out; | |
966 | } | |
967 | ||
7c657876 | 968 | |
66a377c5 IM |
969 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
970 | > TFRC_RECV_NUM_LATE_LOSS) { | |
971 | loss = 1; | |
972 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, | |
973 | hcrx->ccid3hcrx_ccval_nonloss); | |
974 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
975 | dccp_inc_seqno(&tmp_seqno); | |
976 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
977 | dccp_inc_seqno(&tmp_seqno); | |
978 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, | |
979 | tmp_seqno, &ccval)) { | |
980 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
981 | hcrx->ccid3hcrx_ccval_nonloss = ccval; | |
982 | dccp_inc_seqno(&tmp_seqno); | |
983 | } | |
984 | } | |
985 | ||
986 | /* FIXME - this code could be simplified with above while */ | |
987 | /* but works at moment */ | |
988 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
989 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
990 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
991 | } | |
992 | ||
993 | detect_out: | |
994 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, | |
995 | &hcrx->ccid3hcrx_li_hist, packet, | |
996 | hcrx->ccid3hcrx_seqno_nonloss); | |
997 | return loss; | |
7c657876 ACM |
998 | } |
999 | ||
7c657876 ACM |
1000 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
1001 | { | |
59725dc2 | 1002 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
4fded33b | 1003 | const struct dccp_options_received *opt_recv; |
8c60f3fa | 1004 | struct dccp_rx_hist_entry *packet; |
7c657876 ACM |
1005 | struct timeval now; |
1006 | u8 win_count; | |
66a377c5 IM |
1007 | u32 p_prev, rtt_prev, r_sample, t_elapsed; |
1008 | int loss; | |
1f2333ae | 1009 | |
59d203f9 ACM |
1010 | BUG_ON(hcrx == NULL || |
1011 | !(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA || | |
7c657876 ACM |
1012 | hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA)); |
1013 | ||
59725dc2 | 1014 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
4fded33b | 1015 | |
7c657876 ACM |
1016 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
1017 | case DCCP_PKT_ACK: | |
1018 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
1019 | return; | |
1020 | case DCCP_PKT_DATAACK: | |
4fded33b | 1021 | if (opt_recv->dccpor_timestamp_echo == 0) |
7c657876 | 1022 | break; |
66a377c5 | 1023 | rtt_prev = hcrx->ccid3hcrx_rtt; |
b0e56780 | 1024 | dccp_timestamp(sk, &now); |
b3a3077d ACM |
1025 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
1026 | r_sample = timeval_usecs(&now); | |
1027 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; | |
1028 | ||
1029 | if (unlikely(r_sample <= t_elapsed)) | |
59d203f9 ACM |
1030 | LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, " |
1031 | "t_elapsed=%uus\n", | |
b3a3077d ACM |
1032 | __FUNCTION__, r_sample, t_elapsed); |
1033 | else | |
1034 | r_sample -= t_elapsed; | |
1035 | ||
1036 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
1037 | hcrx->ccid3hcrx_rtt = r_sample; | |
1038 | else | |
1039 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + | |
1040 | r_sample / 10; | |
1041 | ||
66a377c5 IM |
1042 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
1043 | ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", | |
4fded33b ACM |
1044 | dccp_role(sk), hcrx->ccid3hcrx_rtt, |
1045 | opt_recv->dccpor_elapsed_time); | |
7c657876 ACM |
1046 | break; |
1047 | case DCCP_PKT_DATA: | |
1048 | break; | |
59d203f9 | 1049 | default: /* We're not interested in other packet types, move along */ |
7c657876 ACM |
1050 | return; |
1051 | } | |
1052 | ||
b0e56780 | 1053 | packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, |
8c60f3fa | 1054 | skb, SLAB_ATOMIC); |
59d203f9 ACM |
1055 | if (unlikely(packet == NULL)) { |
1056 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Not enough mem to " | |
1057 | "add rx packet to history, consider it lost!\n", | |
1058 | __FUNCTION__, dccp_role(sk), sk); | |
7c657876 ACM |
1059 | return; |
1060 | } | |
1061 | ||
c1734376 | 1062 | win_count = packet->dccphrx_ccval; |
7c657876 | 1063 | |
66a377c5 | 1064 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
7c657876 ACM |
1065 | |
1066 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) | |
1067 | return; | |
1068 | ||
1069 | switch (hcrx->ccid3hcrx_state) { | |
1070 | case TFRC_RSTATE_NO_DATA: | |
1f2333ae ACM |
1071 | ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " |
1072 | "feedback\n", | |
1073 | dccp_role(sk), sk, | |
1074 | dccp_state_name(sk->sk_state), skb); | |
7c657876 ACM |
1075 | ccid3_hc_rx_send_feedback(sk); |
1076 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); | |
1077 | return; | |
1078 | case TFRC_RSTATE_DATA: | |
1f2333ae ACM |
1079 | hcrx->ccid3hcrx_bytes_recv += skb->len - |
1080 | dccp_hdr(skb)->dccph_doff * 4; | |
66a377c5 | 1081 | if (loss) |
b6ee3d4a ACM |
1082 | break; |
1083 | ||
b0e56780 | 1084 | dccp_timestamp(sk, &now); |
b6ee3d4a ACM |
1085 | if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= |
1086 | hcrx->ccid3hcrx_rtt) { | |
1087 | hcrx->ccid3hcrx_tstamp_last_ack = now; | |
1088 | ccid3_hc_rx_send_feedback(sk); | |
7c657876 | 1089 | } |
b6ee3d4a | 1090 | return; |
7c657876 ACM |
1091 | default: |
1092 | printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", | |
1093 | __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state); | |
1094 | dump_stack(); | |
1095 | return; | |
1096 | } | |
1097 | ||
1098 | /* Dealing with packet loss */ | |
4fded33b ACM |
1099 | ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", |
1100 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); | |
7c657876 | 1101 | |
7c657876 ACM |
1102 | p_prev = hcrx->ccid3hcrx_p; |
1103 | ||
1104 | /* Calculate loss event rate */ | |
c0996660 IM |
1105 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
1106 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); | |
1107 | ||
7c657876 | 1108 | /* Scaling up by 1000000 as fixed decimal */ |
c0996660 IM |
1109 | if (i_mean != 0) |
1110 | hcrx->ccid3hcrx_p = 1000000 / i_mean; | |
66a377c5 IM |
1111 | } else { |
1112 | printk(KERN_CRIT "%s: empty loss hist\n",__FUNCTION__); | |
1113 | dump_stack(); | |
c0996660 | 1114 | } |
7c657876 ACM |
1115 | |
1116 | if (hcrx->ccid3hcrx_p > p_prev) { | |
1117 | ccid3_hc_rx_send_feedback(sk); | |
1118 | return; | |
1119 | } | |
1120 | } | |
1121 | ||
91f0ebf7 | 1122 | static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) |
7c657876 ACM |
1123 | { |
1124 | struct dccp_sock *dp = dccp_sk(sk); | |
91f0ebf7 | 1125 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
7c657876 ACM |
1126 | |
1127 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
1128 | ||
a84ffe43 ACM |
1129 | if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && |
1130 | dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) | |
1131 | hcrx->ccid3hcrx_s = dp->dccps_packet_size; | |
7c657876 ACM |
1132 | else |
1133 | hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE; | |
1134 | ||
1135 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; | |
1136 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); | |
ae6706f0 | 1137 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
b0e56780 | 1138 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
954ee31f ACM |
1139 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
1140 | hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ | |
7c657876 ACM |
1141 | return 0; |
1142 | } | |
1143 | ||
1144 | static void ccid3_hc_rx_exit(struct sock *sk) | |
1145 | { | |
59725dc2 | 1146 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 1147 | |
59d203f9 | 1148 | BUG_ON(hcrx == NULL); |
7c657876 ACM |
1149 | |
1150 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); | |
1151 | ||
1152 | /* Empty packet history */ | |
8c60f3fa | 1153 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
7c657876 ACM |
1154 | |
1155 | /* Empty loss interval history */ | |
ae6706f0 | 1156 | dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); |
7c657876 ACM |
1157 | } |
1158 | ||
2babe1f6 ACM |
1159 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
1160 | { | |
59725dc2 | 1161 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
2babe1f6 | 1162 | |
59c2353d ACM |
1163 | /* Listen socks doesn't have a private CCID block */ |
1164 | if (sk->sk_state == DCCP_LISTEN) | |
1165 | return; | |
1166 | ||
59d203f9 | 1167 | BUG_ON(hcrx == NULL); |
2babe1f6 ACM |
1168 | |
1169 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; | |
1170 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; | |
1171 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; | |
1172 | } | |
1173 | ||
1174 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) | |
1175 | { | |
59725dc2 | 1176 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
2babe1f6 | 1177 | |
59c2353d ACM |
1178 | /* Listen socks doesn't have a private CCID block */ |
1179 | if (sk->sk_state == DCCP_LISTEN) | |
1180 | return; | |
1181 | ||
59d203f9 | 1182 | BUG_ON(hctx == NULL); |
2babe1f6 ACM |
1183 | |
1184 | info->tcpi_rto = hctx->ccid3hctx_t_rto; | |
1185 | info->tcpi_rtt = hctx->ccid3hctx_rtt; | |
1186 | } | |
1187 | ||
88f964db ACM |
1188 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
1189 | u32 __user *optval, int __user *optlen) | |
1190 | { | |
1191 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); | |
1192 | const void *val; | |
1193 | ||
1194 | /* Listen socks doesn't have a private CCID block */ | |
1195 | if (sk->sk_state == DCCP_LISTEN) | |
1196 | return -EINVAL; | |
1197 | ||
1198 | switch (optname) { | |
1199 | case DCCP_SOCKOPT_CCID_RX_INFO: | |
1200 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) | |
1201 | return -EINVAL; | |
1202 | len = sizeof(hcrx->ccid3hcrx_tfrc); | |
1203 | val = &hcrx->ccid3hcrx_tfrc; | |
1204 | break; | |
1205 | default: | |
1206 | return -ENOPROTOOPT; | |
1207 | } | |
1208 | ||
1209 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1210 | return -EFAULT; | |
1211 | ||
1212 | return 0; | |
1213 | } | |
1214 | ||
1215 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, | |
1216 | u32 __user *optval, int __user *optlen) | |
1217 | { | |
1218 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
1219 | const void *val; | |
1220 | ||
1221 | /* Listen socks doesn't have a private CCID block */ | |
1222 | if (sk->sk_state == DCCP_LISTEN) | |
1223 | return -EINVAL; | |
1224 | ||
1225 | switch (optname) { | |
1226 | case DCCP_SOCKOPT_CCID_TX_INFO: | |
1227 | if (len < sizeof(hctx->ccid3hctx_tfrc)) | |
1228 | return -EINVAL; | |
1229 | len = sizeof(hctx->ccid3hctx_tfrc); | |
1230 | val = &hctx->ccid3hctx_tfrc; | |
1231 | break; | |
1232 | default: | |
1233 | return -ENOPROTOOPT; | |
1234 | } | |
1235 | ||
1236 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1237 | return -EFAULT; | |
1238 | ||
1239 | return 0; | |
1240 | } | |
1241 | ||
91f0ebf7 | 1242 | static struct ccid_operations ccid3 = { |
3dd9a7c3 | 1243 | .ccid_id = DCCPC_CCID3, |
7c657876 ACM |
1244 | .ccid_name = "ccid3", |
1245 | .ccid_owner = THIS_MODULE, | |
91f0ebf7 | 1246 | .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), |
7c657876 ACM |
1247 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
1248 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, | |
1249 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, | |
1250 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, | |
1251 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, | |
1252 | .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, | |
1253 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, | |
91f0ebf7 | 1254 | .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), |
7c657876 ACM |
1255 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
1256 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, | |
1257 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, | |
1258 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, | |
2babe1f6 ACM |
1259 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
1260 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, | |
88f964db ACM |
1261 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
1262 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, | |
7c657876 ACM |
1263 | }; |
1264 | ||
1265 | module_param(ccid3_debug, int, 0444); | |
1266 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); | |
1267 | ||
1268 | static __init int ccid3_module_init(void) | |
1269 | { | |
8c60f3fa | 1270 | int rc = -ENOBUFS; |
7c657876 | 1271 | |
8c60f3fa ACM |
1272 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
1273 | if (ccid3_rx_hist == NULL) | |
7c657876 ACM |
1274 | goto out; |
1275 | ||
8c60f3fa ACM |
1276 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
1277 | if (ccid3_tx_hist == NULL) | |
1278 | goto out_free_rx; | |
7c657876 | 1279 | |
ae6706f0 ACM |
1280 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
1281 | if (ccid3_li_hist == NULL) | |
8c60f3fa | 1282 | goto out_free_tx; |
7c657876 ACM |
1283 | |
1284 | rc = ccid_register(&ccid3); | |
1285 | if (rc != 0) | |
1286 | goto out_free_loss_interval_history; | |
7c657876 ACM |
1287 | out: |
1288 | return rc; | |
8c60f3fa | 1289 | |
7c657876 | 1290 | out_free_loss_interval_history: |
ae6706f0 ACM |
1291 | dccp_li_hist_delete(ccid3_li_hist); |
1292 | ccid3_li_hist = NULL; | |
8c60f3fa ACM |
1293 | out_free_tx: |
1294 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1295 | ccid3_tx_hist = NULL; | |
1296 | out_free_rx: | |
1297 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1298 | ccid3_rx_hist = NULL; | |
7c657876 ACM |
1299 | goto out; |
1300 | } | |
1301 | module_init(ccid3_module_init); | |
1302 | ||
1303 | static __exit void ccid3_module_exit(void) | |
1304 | { | |
1305 | ccid_unregister(&ccid3); | |
1306 | ||
8c60f3fa ACM |
1307 | if (ccid3_tx_hist != NULL) { |
1308 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1309 | ccid3_tx_hist = NULL; | |
7c657876 | 1310 | } |
8c60f3fa ACM |
1311 | if (ccid3_rx_hist != NULL) { |
1312 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1313 | ccid3_rx_hist = NULL; | |
7c657876 | 1314 | } |
ae6706f0 ACM |
1315 | if (ccid3_li_hist != NULL) { |
1316 | dccp_li_hist_delete(ccid3_li_hist); | |
1317 | ccid3_li_hist = NULL; | |
7c657876 ACM |
1318 | } |
1319 | } | |
1320 | module_exit(ccid3_module_exit); | |
1321 | ||
e6bccd35 | 1322 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
1f2333ae | 1323 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
7c657876 ACM |
1324 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
1325 | MODULE_LICENSE("GPL"); | |
1326 | MODULE_ALIAS("net-dccp-ccid-3"); |