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 | ||
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 | 381 | * Check if win_count have changed |
0e64e94e | 382 | * Algorithm in "8.1. Window Counter Value" in RFC 4342. |
7c657876 | 383 | */ |
6b5e633a ACM |
384 | quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); |
385 | if (likely(hctx->ccid3hctx_rtt > 8)) | |
386 | quarter_rtt /= hctx->ccid3hctx_rtt / 4; | |
387 | ||
7c657876 ACM |
388 | if (quarter_rtt > 0) { |
389 | hctx->ccid3hctx_t_last_win_count = now; | |
390 | hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + | |
391 | min_t(unsigned long, quarter_rtt, 5)) % 16; | |
1f2333ae ACM |
392 | ccid3_pr_debug("%s, sk=%p, window changed from " |
393 | "%u to %u!\n", | |
7c657876 | 394 | dccp_role(sk), sk, |
c1734376 | 395 | packet->dccphtx_ccval, |
7c657876 ACM |
396 | hctx->ccid3hctx_last_win_count); |
397 | } | |
1f2333ae | 398 | |
7c657876 | 399 | hctx->ccid3hctx_idle = 0; |
c1734376 | 400 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; |
8c60f3fa | 401 | packet->dccphtx_sent = 1; |
7c657876 ACM |
402 | } else |
403 | ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", | |
404 | dccp_role(sk), sk, dp->dccps_gss); | |
405 | ||
406 | switch (hctx->ccid3hctx_state) { | |
407 | case TFRC_SSTATE_NO_SENT: | |
408 | /* if first wasn't pure ack */ | |
409 | if (len != 0) | |
1f2333ae ACM |
410 | printk(KERN_CRIT "%s: %s, First packet sent is noted " |
411 | "as a data packet\n", | |
7c657876 ACM |
412 | __FUNCTION__, dccp_role(sk)); |
413 | return; | |
414 | case TFRC_SSTATE_NO_FBACK: | |
415 | case TFRC_SSTATE_FBACK: | |
416 | if (len > 0) { | |
66a377c5 IM |
417 | timeval_sub_usecs(&hctx->ccid3hctx_t_nom, |
418 | hctx->ccid3hctx_t_ipi); | |
7c657876 ACM |
419 | ccid3_calc_new_t_ipi(hctx); |
420 | ccid3_calc_new_delta(hctx); | |
b6ee3d4a ACM |
421 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, |
422 | hctx->ccid3hctx_t_ipi); | |
7c657876 ACM |
423 | } |
424 | break; | |
425 | default: | |
426 | printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", | |
427 | __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); | |
428 | dump_stack(); | |
429 | break; | |
430 | } | |
431 | } | |
432 | ||
433 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) | |
434 | { | |
59725dc2 ACM |
435 | const struct dccp_sock *dp = dccp_sk(sk); |
436 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 | 437 | struct ccid3_options_received *opt_recv; |
8c60f3fa | 438 | struct dccp_tx_hist_entry *packet; |
b0e56780 | 439 | struct timeval now; |
7c657876 | 440 | unsigned long next_tmout; |
1bc09869 | 441 | u32 t_elapsed; |
7c657876 ACM |
442 | u32 pinv; |
443 | u32 x_recv; | |
444 | u32 r_sample; | |
1f2333ae | 445 | |
59d203f9 | 446 | BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM); |
7c657876 ACM |
447 | |
448 | /* we are only interested in ACKs */ | |
449 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || | |
450 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) | |
451 | return; | |
452 | ||
453 | opt_recv = &hctx->ccid3hctx_options_received; | |
454 | ||
1a28599a | 455 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; |
7c657876 ACM |
456 | x_recv = opt_recv->ccid3or_receive_rate; |
457 | pinv = opt_recv->ccid3or_loss_event_rate; | |
458 | ||
459 | switch (hctx->ccid3hctx_state) { | |
460 | case TFRC_SSTATE_NO_SENT: | |
461 | /* FIXME: what to do here? */ | |
462 | return; | |
463 | case TFRC_SSTATE_NO_FBACK: | |
464 | case TFRC_SSTATE_FBACK: | |
465 | /* Calculate new round trip sample by | |
466 | * R_sample = (now - t_recvdata) - t_delay */ | |
467 | /* get t_recvdata from history */ | |
8c60f3fa ACM |
468 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
469 | DCCP_SKB_CB(skb)->dccpd_ack_seq); | |
59d203f9 ACM |
470 | if (unlikely(packet == NULL)) { |
471 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, seqno " | |
472 | "%llu(%s) does't exist in history!\n", | |
473 | __FUNCTION__, dccp_role(sk), sk, | |
474 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, | |
475 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); | |
7c657876 ACM |
476 | return; |
477 | } | |
478 | ||
479 | /* Update RTT */ | |
b0e56780 ACM |
480 | dccp_timestamp(sk, &now); |
481 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); | |
1a28599a | 482 | if (unlikely(r_sample <= t_elapsed)) |
59d203f9 ACM |
483 | LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, " |
484 | "t_elapsed=%uus\n", | |
1a28599a ACM |
485 | __FUNCTION__, r_sample, t_elapsed); |
486 | else | |
487 | r_sample -= t_elapsed; | |
7c657876 ACM |
488 | |
489 | /* Update RTT estimate by | |
490 | * If (No feedback recv) | |
491 | * R = R_sample; | |
492 | * Else | |
493 | * R = q * R + (1 - q) * R_sample; | |
494 | * | |
495 | * q is a constant, RFC 3448 recomments 0.9 | |
496 | */ | |
497 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { | |
498 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); | |
499 | hctx->ccid3hctx_rtt = r_sample; | |
500 | } else | |
1f2333ae ACM |
501 | hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + |
502 | r_sample / 10; | |
7c657876 | 503 | |
1f2333ae ACM |
504 | ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " |
505 | "r_sample=%us\n", dccp_role(sk), sk, | |
506 | hctx->ccid3hctx_rtt, r_sample); | |
7c657876 ACM |
507 | |
508 | /* Update timeout interval */ | |
c68e64cf ACM |
509 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
510 | USEC_PER_SEC); | |
7c657876 ACM |
511 | |
512 | /* Update receive rate */ | |
1f2333ae | 513 | hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ |
7c657876 ACM |
514 | |
515 | /* Update loss event rate */ | |
516 | if (pinv == ~0 || pinv == 0) | |
517 | hctx->ccid3hctx_p = 0; | |
518 | else { | |
519 | hctx->ccid3hctx_p = 1000000 / pinv; | |
520 | ||
521 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { | |
522 | hctx->ccid3hctx_p = TFRC_SMALLEST_P; | |
1f2333ae ACM |
523 | ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", |
524 | dccp_role(sk), sk); | |
7c657876 ACM |
525 | } |
526 | } | |
527 | ||
528 | /* unschedule no feedback timer */ | |
529 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
530 | ||
531 | /* Update sending rate */ | |
532 | ccid3_hc_tx_update_x(sk); | |
533 | ||
534 | /* Update next send time */ | |
b6ee3d4a ACM |
535 | timeval_sub_usecs(&hctx->ccid3hctx_t_nom, |
536 | hctx->ccid3hctx_t_ipi); | |
7c657876 | 537 | ccid3_calc_new_t_ipi(hctx); |
b6ee3d4a ACM |
538 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, |
539 | hctx->ccid3hctx_t_ipi); | |
7c657876 ACM |
540 | ccid3_calc_new_delta(hctx); |
541 | ||
542 | /* remove all packets older than the one acked from history */ | |
8c60f3fa ACM |
543 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
544 | &hctx->ccid3hctx_hist, packet); | |
c530cfb1 ACM |
545 | /* |
546 | * As we have calculated new ipi, delta, t_nom it is possible that | |
547 | * we now can send a packet, so wake up dccp_wait_for_ccids. | |
548 | */ | |
549 | sk->sk_write_space(sk); | |
8c60f3fa | 550 | |
1f2333ae ACM |
551 | /* |
552 | * Schedule no feedback timer to expire in | |
553 | * max(4 * R, 2 * s / X) | |
554 | */ | |
c68e64cf | 555 | next_tmout = max(hctx->ccid3hctx_t_rto, |
6b5e633a ACM |
556 | 2 * usecs_div(hctx->ccid3hctx_s, |
557 | hctx->ccid3hctx_x)); | |
558 | ||
1f2333ae ACM |
559 | ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " |
560 | "expire in %lu jiffies (%luus)\n", | |
561 | dccp_role(sk), sk, | |
562 | usecs_to_jiffies(next_tmout), next_tmout); | |
7c657876 ACM |
563 | |
564 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
1f2333ae | 565 | jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); |
7c657876 ACM |
566 | |
567 | /* set idle flag */ | |
568 | hctx->ccid3hctx_idle = 1; | |
569 | break; | |
570 | default: | |
571 | printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", | |
572 | __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); | |
573 | dump_stack(); | |
574 | break; | |
575 | } | |
576 | } | |
577 | ||
2d0817d1 | 578 | static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 579 | { |
59d203f9 | 580 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 581 | |
59d203f9 ACM |
582 | BUG_ON(hctx == NULL); |
583 | ||
2d0817d1 ACM |
584 | if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) |
585 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; | |
586 | return 0; | |
7c657876 ACM |
587 | } |
588 | ||
589 | static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, | |
1f2333ae ACM |
590 | unsigned char len, u16 idx, |
591 | unsigned char *value) | |
7c657876 ACM |
592 | { |
593 | int rc = 0; | |
59725dc2 ACM |
594 | const struct dccp_sock *dp = dccp_sk(sk); |
595 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 ACM |
596 | struct ccid3_options_received *opt_recv; |
597 | ||
59d203f9 | 598 | BUG_ON(hctx == NULL); |
7c657876 ACM |
599 | |
600 | opt_recv = &hctx->ccid3hctx_options_received; | |
601 | ||
602 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { | |
603 | opt_recv->ccid3or_seqno = dp->dccps_gsr; | |
604 | opt_recv->ccid3or_loss_event_rate = ~0; | |
605 | opt_recv->ccid3or_loss_intervals_idx = 0; | |
606 | opt_recv->ccid3or_loss_intervals_len = 0; | |
607 | opt_recv->ccid3or_receive_rate = 0; | |
608 | } | |
609 | ||
610 | switch (option) { | |
611 | case TFRC_OPT_LOSS_EVENT_RATE: | |
59d203f9 ACM |
612 | if (unlikely(len != 4)) { |
613 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid " | |
614 | "len for TFRC_OPT_LOSS_EVENT_RATE\n", | |
615 | __FUNCTION__, dccp_role(sk), sk); | |
7c657876 ACM |
616 | rc = -EINVAL; |
617 | } else { | |
60fe62e7 | 618 | opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
619 | ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", |
620 | dccp_role(sk), sk, | |
621 | opt_recv->ccid3or_loss_event_rate); | |
622 | } | |
623 | break; | |
624 | case TFRC_OPT_LOSS_INTERVALS: | |
625 | opt_recv->ccid3or_loss_intervals_idx = idx; | |
626 | opt_recv->ccid3or_loss_intervals_len = len; | |
627 | ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", | |
628 | dccp_role(sk), sk, | |
629 | opt_recv->ccid3or_loss_intervals_idx, | |
630 | opt_recv->ccid3or_loss_intervals_len); | |
631 | break; | |
632 | case TFRC_OPT_RECEIVE_RATE: | |
59d203f9 ACM |
633 | if (unlikely(len != 4)) { |
634 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid " | |
635 | "len for TFRC_OPT_RECEIVE_RATE\n", | |
636 | __FUNCTION__, dccp_role(sk), sk); | |
7c657876 ACM |
637 | rc = -EINVAL; |
638 | } else { | |
60fe62e7 | 639 | opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); |
7c657876 ACM |
640 | ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", |
641 | dccp_role(sk), sk, | |
642 | opt_recv->ccid3or_receive_rate); | |
643 | } | |
644 | break; | |
645 | } | |
646 | ||
647 | return rc; | |
648 | } | |
649 | ||
91f0ebf7 | 650 | static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) |
7c657876 ACM |
651 | { |
652 | struct dccp_sock *dp = dccp_sk(sk); | |
91f0ebf7 | 653 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
7c657876 | 654 | |
a84ffe43 ACM |
655 | if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && |
656 | dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) | |
657 | hctx->ccid3hctx_s = dp->dccps_packet_size; | |
7c657876 ACM |
658 | else |
659 | hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE; | |
660 | ||
1f2333ae ACM |
661 | /* Set transmission rate to 1 packet per second */ |
662 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; | |
c68e64cf | 663 | hctx->ccid3hctx_t_rto = USEC_PER_SEC; |
7c657876 ACM |
664 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
665 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); | |
aa5d7df3 ACM |
666 | |
667 | hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; | |
668 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; | |
7c657876 ACM |
669 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
674 | static void ccid3_hc_tx_exit(struct sock *sk) | |
675 | { | |
59725dc2 | 676 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 677 | |
7c657876 ACM |
678 | BUG_ON(hctx == NULL); |
679 | ||
680 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); | |
681 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
682 | ||
683 | /* Empty packet history */ | |
8c60f3fa | 684 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
7c657876 ACM |
685 | } |
686 | ||
687 | /* | |
688 | * RX Half Connection methods | |
689 | */ | |
690 | ||
691 | /* TFRC receiver states */ | |
692 | enum ccid3_hc_rx_states { | |
693 | TFRC_RSTATE_NO_DATA = 1, | |
694 | TFRC_RSTATE_DATA, | |
695 | TFRC_RSTATE_TERM = 127, | |
696 | }; | |
697 | ||
698 | #ifdef CCID3_DEBUG | |
699 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) | |
700 | { | |
701 | static char *ccid3_rx_state_names[] = { | |
702 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", | |
703 | [TFRC_RSTATE_DATA] = "DATA", | |
704 | [TFRC_RSTATE_TERM] = "TERM", | |
705 | }; | |
706 | ||
707 | return ccid3_rx_state_names[state]; | |
708 | } | |
709 | #endif | |
710 | ||
c25a18ba ACM |
711 | static void ccid3_hc_rx_set_state(struct sock *sk, |
712 | enum ccid3_hc_rx_states state) | |
7c657876 | 713 | { |
59725dc2 | 714 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 ACM |
715 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
716 | ||
717 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
718 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
719 | ccid3_rx_state_name(state)); | |
7c657876 ACM |
720 | WARN_ON(state == oldstate); |
721 | hcrx->ccid3hcrx_state = state; | |
722 | } | |
723 | ||
7c657876 ACM |
724 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
725 | { | |
59725dc2 | 726 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 727 | struct dccp_sock *dp = dccp_sk(sk); |
8c60f3fa | 728 | struct dccp_rx_hist_entry *packet; |
b6ee3d4a | 729 | struct timeval now; |
7c657876 ACM |
730 | |
731 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
732 | ||
b0e56780 | 733 | dccp_timestamp(sk, &now); |
b6ee3d4a | 734 | |
7c657876 ACM |
735 | switch (hcrx->ccid3hcrx_state) { |
736 | case TFRC_RSTATE_NO_DATA: | |
737 | hcrx->ccid3hcrx_x_recv = 0; | |
738 | break; | |
739 | case TFRC_RSTATE_DATA: { | |
b6ee3d4a ACM |
740 | const u32 delta = timeval_delta(&now, |
741 | &hcrx->ccid3hcrx_tstamp_last_feedback); | |
27ae543e ACM |
742 | hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, |
743 | delta); | |
7c657876 ACM |
744 | } |
745 | break; | |
746 | default: | |
747 | printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", | |
748 | __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state); | |
749 | dump_stack(); | |
750 | return; | |
751 | } | |
752 | ||
8c60f3fa | 753 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
59d203f9 ACM |
754 | if (unlikely(packet == NULL)) { |
755 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, no data packet " | |
756 | "in history!\n", | |
757 | __FUNCTION__, dccp_role(sk), sk); | |
7c657876 ACM |
758 | return; |
759 | } | |
760 | ||
b6ee3d4a | 761 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
66a377c5 | 762 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
7c657876 ACM |
763 | hcrx->ccid3hcrx_bytes_recv = 0; |
764 | ||
765 | /* Convert to multiples of 10us */ | |
b6ee3d4a ACM |
766 | hcrx->ccid3hcrx_elapsed_time = |
767 | timeval_delta(&now, &packet->dccphrx_tstamp) / 10; | |
7c657876 ACM |
768 | if (hcrx->ccid3hcrx_p == 0) |
769 | hcrx->ccid3hcrx_pinv = ~0; | |
770 | else | |
771 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; | |
507d37cf | 772 | dp->dccps_hc_rx_insert_options = 1; |
7c657876 ACM |
773 | dccp_send_ack(sk); |
774 | } | |
775 | ||
2d0817d1 | 776 | static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 777 | { |
59d203f9 | 778 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
60fe62e7 | 779 | __be32 x_recv, pinv; |
7c657876 | 780 | |
59d203f9 ACM |
781 | BUG_ON(hcrx == NULL); |
782 | ||
783 | if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) | |
2d0817d1 | 784 | return 0; |
7c657876 | 785 | |
66a377c5 | 786 | DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; |
4fded33b ACM |
787 | |
788 | if (dccp_packet_without_ack(skb)) | |
2d0817d1 ACM |
789 | return 0; |
790 | ||
4fded33b ACM |
791 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
792 | pinv = htonl(hcrx->ccid3hcrx_pinv); | |
2d0817d1 ACM |
793 | |
794 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && | |
795 | dccp_insert_option_elapsed_time(sk, skb, | |
796 | hcrx->ccid3hcrx_elapsed_time)) || | |
797 | dccp_insert_option_timestamp(sk, skb) || | |
798 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, | |
799 | &pinv, sizeof(pinv)) || | |
800 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, | |
801 | &x_recv, sizeof(x_recv))) | |
802 | return -1; | |
803 | ||
804 | return 0; | |
7c657876 ACM |
805 | } |
806 | ||
7c657876 ACM |
807 | /* calculate first loss interval |
808 | * | |
809 | * returns estimated loss interval in usecs */ | |
810 | ||
811 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) | |
812 | { | |
59725dc2 | 813 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
8c60f3fa | 814 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
7c657876 | 815 | u32 rtt, delta, x_recv, fval, p, tmp2; |
b6ee3d4a | 816 | struct timeval tstamp = { 0, }; |
7c657876 ACM |
817 | int interval = 0; |
818 | int win_count = 0; | |
819 | int step = 0; | |
820 | u64 tmp1; | |
821 | ||
8c60f3fa ACM |
822 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
823 | dccphrx_node) { | |
824 | if (dccp_rx_hist_entry_data_packet(entry)) { | |
7c657876 ACM |
825 | tail = entry; |
826 | ||
827 | switch (step) { | |
828 | case 0: | |
8c60f3fa | 829 | tstamp = entry->dccphrx_tstamp; |
c1734376 | 830 | win_count = entry->dccphrx_ccval; |
7c657876 ACM |
831 | step = 1; |
832 | break; | |
833 | case 1: | |
c1734376 | 834 | interval = win_count - entry->dccphrx_ccval; |
7c657876 ACM |
835 | if (interval < 0) |
836 | interval += TFRC_WIN_COUNT_LIMIT; | |
837 | if (interval > 4) | |
838 | goto found; | |
839 | break; | |
840 | } | |
841 | } | |
842 | } | |
843 | ||
59d203f9 ACM |
844 | if (unlikely(step == 0)) { |
845 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, packet history " | |
846 | "contains no data packets!\n", | |
847 | __FUNCTION__, dccp_role(sk), sk); | |
7c657876 ACM |
848 | return ~0; |
849 | } | |
850 | ||
59d203f9 ACM |
851 | if (unlikely(interval == 0)) { |
852 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Could not find a " | |
853 | "win_count interval > 0. Defaulting to 1\n", | |
854 | __FUNCTION__, dccp_role(sk), sk); | |
7c657876 ACM |
855 | interval = 1; |
856 | } | |
857 | found: | |
66a377c5 IM |
858 | if (!tail) { |
859 | LIMIT_NETDEBUG(KERN_WARNING "%s: tail is null\n", | |
860 | __FUNCTION__); | |
861 | return ~0; | |
862 | } | |
b6ee3d4a | 863 | rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; |
7c657876 ACM |
864 | ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", |
865 | dccp_role(sk), sk, rtt); | |
866 | if (rtt == 0) | |
867 | rtt = 1; | |
868 | ||
b0e56780 ACM |
869 | dccp_timestamp(sk, &tstamp); |
870 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); | |
871 | x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); | |
7c657876 | 872 | |
66a377c5 IM |
873 | if (x_recv == 0) |
874 | x_recv = hcrx->ccid3hcrx_x_recv; | |
875 | ||
7c657876 ACM |
876 | tmp1 = (u64)x_recv * (u64)rtt; |
877 | do_div(tmp1,10000000); | |
878 | tmp2 = (u32)tmp1; | |
66a377c5 IM |
879 | |
880 | if (!tmp2) { | |
881 | LIMIT_NETDEBUG(KERN_WARNING "tmp2 = 0 " | |
882 | "%s: x_recv = %u, rtt =%u\n", | |
883 | __FUNCTION__, x_recv, rtt); | |
884 | return ~0; | |
885 | } | |
886 | ||
7c657876 ACM |
887 | fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; |
888 | /* do not alter order above or you will get overflow on 32 bit */ | |
36729c1a | 889 | p = tfrc_calc_x_reverse_lookup(fval); |
1f2333ae ACM |
890 | ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " |
891 | "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); | |
7c657876 ACM |
892 | |
893 | if (p == 0) | |
894 | return ~0; | |
895 | else | |
896 | return 1000000 / p; | |
897 | } | |
898 | ||
899 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) | |
900 | { | |
59725dc2 | 901 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
fc747e82 | 902 | struct dccp_li_hist_entry *head; |
66a377c5 | 903 | u64 seq_temp; |
7c657876 | 904 | |
66a377c5 IM |
905 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
906 | if (!dccp_li_hist_interval_new(ccid3_li_hist, | |
907 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) | |
908 | return; | |
7c657876 | 909 | |
fc747e82 IM |
910 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
911 | struct dccp_li_hist_entry, dccplih_node); | |
912 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); | |
66a377c5 IM |
913 | } else { |
914 | struct dccp_li_hist_entry *entry; | |
915 | struct list_head *tail; | |
916 | ||
fc747e82 IM |
917 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
918 | struct dccp_li_hist_entry, dccplih_node); | |
66a377c5 IM |
919 | /* FIXME win count check removed as was wrong */ |
920 | /* should make this check with receive history */ | |
921 | /* and compare there as per section 10.2 of RFC4342 */ | |
922 | ||
923 | /* new loss event detected */ | |
924 | /* calculate last interval length */ | |
925 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); | |
926 | entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); | |
927 | ||
928 | if (entry == NULL) { | |
929 | printk(KERN_CRIT "%s: out of memory\n",__FUNCTION__); | |
930 | dump_stack(); | |
ae6706f0 | 931 | return; |
66a377c5 IM |
932 | } |
933 | ||
934 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); | |
935 | ||
936 | tail = hcrx->ccid3hcrx_li_hist.prev; | |
937 | list_del(tail); | |
938 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); | |
939 | ||
940 | /* Create the newest interval */ | |
941 | entry->dccplih_seqno = seq_loss; | |
942 | entry->dccplih_interval = seq_temp; | |
943 | entry->dccplih_win_count = win_loss; | |
944 | } | |
7c657876 ACM |
945 | } |
946 | ||
66a377c5 IM |
947 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
948 | struct dccp_rx_hist_entry *packet) | |
7c657876 | 949 | { |
59725dc2 | 950 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
66a377c5 IM |
951 | struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
952 | u64 seqno = packet->dccphrx_seqno; | |
953 | u64 tmp_seqno; | |
954 | int loss = 0; | |
955 | u8 ccval; | |
956 | ||
957 | ||
958 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
959 | ||
960 | if (!rx_hist || | |
961 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
962 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
963 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
964 | goto detect_out; | |
965 | } | |
966 | ||
7c657876 | 967 | |
66a377c5 IM |
968 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
969 | > TFRC_RECV_NUM_LATE_LOSS) { | |
970 | loss = 1; | |
971 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, | |
972 | hcrx->ccid3hcrx_ccval_nonloss); | |
973 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
974 | dccp_inc_seqno(&tmp_seqno); | |
975 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
976 | dccp_inc_seqno(&tmp_seqno); | |
977 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, | |
978 | tmp_seqno, &ccval)) { | |
979 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
980 | hcrx->ccid3hcrx_ccval_nonloss = ccval; | |
981 | dccp_inc_seqno(&tmp_seqno); | |
982 | } | |
983 | } | |
984 | ||
985 | /* FIXME - this code could be simplified with above while */ | |
986 | /* but works at moment */ | |
987 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
988 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
989 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
990 | } | |
991 | ||
992 | detect_out: | |
993 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, | |
994 | &hcrx->ccid3hcrx_li_hist, packet, | |
995 | hcrx->ccid3hcrx_seqno_nonloss); | |
996 | return loss; | |
7c657876 ACM |
997 | } |
998 | ||
7c657876 ACM |
999 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
1000 | { | |
59725dc2 | 1001 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
4fded33b | 1002 | const struct dccp_options_received *opt_recv; |
8c60f3fa | 1003 | struct dccp_rx_hist_entry *packet; |
7c657876 ACM |
1004 | struct timeval now; |
1005 | u8 win_count; | |
66a377c5 IM |
1006 | u32 p_prev, rtt_prev, r_sample, t_elapsed; |
1007 | int loss; | |
1f2333ae | 1008 | |
59d203f9 ACM |
1009 | BUG_ON(hcrx == NULL || |
1010 | !(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA || | |
7c657876 ACM |
1011 | hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA)); |
1012 | ||
59725dc2 | 1013 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
4fded33b | 1014 | |
7c657876 ACM |
1015 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
1016 | case DCCP_PKT_ACK: | |
1017 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
1018 | return; | |
1019 | case DCCP_PKT_DATAACK: | |
4fded33b | 1020 | if (opt_recv->dccpor_timestamp_echo == 0) |
7c657876 | 1021 | break; |
66a377c5 | 1022 | rtt_prev = hcrx->ccid3hcrx_rtt; |
b0e56780 | 1023 | dccp_timestamp(sk, &now); |
b3a3077d ACM |
1024 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
1025 | r_sample = timeval_usecs(&now); | |
1026 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; | |
1027 | ||
1028 | if (unlikely(r_sample <= t_elapsed)) | |
59d203f9 ACM |
1029 | LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, " |
1030 | "t_elapsed=%uus\n", | |
b3a3077d ACM |
1031 | __FUNCTION__, r_sample, t_elapsed); |
1032 | else | |
1033 | r_sample -= t_elapsed; | |
1034 | ||
1035 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
1036 | hcrx->ccid3hcrx_rtt = r_sample; | |
1037 | else | |
1038 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + | |
1039 | r_sample / 10; | |
1040 | ||
66a377c5 IM |
1041 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
1042 | ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", | |
4fded33b ACM |
1043 | dccp_role(sk), hcrx->ccid3hcrx_rtt, |
1044 | opt_recv->dccpor_elapsed_time); | |
7c657876 ACM |
1045 | break; |
1046 | case DCCP_PKT_DATA: | |
1047 | break; | |
59d203f9 | 1048 | default: /* We're not interested in other packet types, move along */ |
7c657876 ACM |
1049 | return; |
1050 | } | |
1051 | ||
b0e56780 | 1052 | packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, |
8c60f3fa | 1053 | skb, SLAB_ATOMIC); |
59d203f9 ACM |
1054 | if (unlikely(packet == NULL)) { |
1055 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Not enough mem to " | |
1056 | "add rx packet to history, consider it lost!\n", | |
1057 | __FUNCTION__, dccp_role(sk), sk); | |
7c657876 ACM |
1058 | return; |
1059 | } | |
1060 | ||
c1734376 | 1061 | win_count = packet->dccphrx_ccval; |
7c657876 | 1062 | |
66a377c5 | 1063 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
7c657876 ACM |
1064 | |
1065 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) | |
1066 | return; | |
1067 | ||
1068 | switch (hcrx->ccid3hcrx_state) { | |
1069 | case TFRC_RSTATE_NO_DATA: | |
1f2333ae ACM |
1070 | ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " |
1071 | "feedback\n", | |
1072 | dccp_role(sk), sk, | |
1073 | dccp_state_name(sk->sk_state), skb); | |
7c657876 ACM |
1074 | ccid3_hc_rx_send_feedback(sk); |
1075 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); | |
1076 | return; | |
1077 | case TFRC_RSTATE_DATA: | |
1f2333ae ACM |
1078 | hcrx->ccid3hcrx_bytes_recv += skb->len - |
1079 | dccp_hdr(skb)->dccph_doff * 4; | |
66a377c5 | 1080 | if (loss) |
b6ee3d4a ACM |
1081 | break; |
1082 | ||
b0e56780 | 1083 | dccp_timestamp(sk, &now); |
b6ee3d4a ACM |
1084 | if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= |
1085 | hcrx->ccid3hcrx_rtt) { | |
1086 | hcrx->ccid3hcrx_tstamp_last_ack = now; | |
1087 | ccid3_hc_rx_send_feedback(sk); | |
7c657876 | 1088 | } |
b6ee3d4a | 1089 | return; |
7c657876 ACM |
1090 | default: |
1091 | printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", | |
1092 | __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state); | |
1093 | dump_stack(); | |
1094 | return; | |
1095 | } | |
1096 | ||
1097 | /* Dealing with packet loss */ | |
4fded33b ACM |
1098 | ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", |
1099 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); | |
7c657876 | 1100 | |
7c657876 ACM |
1101 | p_prev = hcrx->ccid3hcrx_p; |
1102 | ||
1103 | /* Calculate loss event rate */ | |
c0996660 IM |
1104 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
1105 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); | |
1106 | ||
7c657876 | 1107 | /* Scaling up by 1000000 as fixed decimal */ |
c0996660 IM |
1108 | if (i_mean != 0) |
1109 | hcrx->ccid3hcrx_p = 1000000 / i_mean; | |
66a377c5 IM |
1110 | } else { |
1111 | printk(KERN_CRIT "%s: empty loss hist\n",__FUNCTION__); | |
1112 | dump_stack(); | |
c0996660 | 1113 | } |
7c657876 ACM |
1114 | |
1115 | if (hcrx->ccid3hcrx_p > p_prev) { | |
1116 | ccid3_hc_rx_send_feedback(sk); | |
1117 | return; | |
1118 | } | |
1119 | } | |
1120 | ||
91f0ebf7 | 1121 | static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) |
7c657876 ACM |
1122 | { |
1123 | struct dccp_sock *dp = dccp_sk(sk); | |
91f0ebf7 | 1124 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
7c657876 ACM |
1125 | |
1126 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); | |
1127 | ||
a84ffe43 ACM |
1128 | if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && |
1129 | dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) | |
1130 | hcrx->ccid3hcrx_s = dp->dccps_packet_size; | |
7c657876 ACM |
1131 | else |
1132 | hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE; | |
1133 | ||
1134 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; | |
1135 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); | |
ae6706f0 | 1136 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
b0e56780 | 1137 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
954ee31f ACM |
1138 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
1139 | hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ | |
7c657876 ACM |
1140 | return 0; |
1141 | } | |
1142 | ||
1143 | static void ccid3_hc_rx_exit(struct sock *sk) | |
1144 | { | |
59725dc2 | 1145 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 1146 | |
59d203f9 | 1147 | BUG_ON(hcrx == NULL); |
7c657876 ACM |
1148 | |
1149 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); | |
1150 | ||
1151 | /* Empty packet history */ | |
8c60f3fa | 1152 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
7c657876 ACM |
1153 | |
1154 | /* Empty loss interval history */ | |
ae6706f0 | 1155 | dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); |
7c657876 ACM |
1156 | } |
1157 | ||
2babe1f6 ACM |
1158 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
1159 | { | |
59725dc2 | 1160 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
2babe1f6 | 1161 | |
59c2353d ACM |
1162 | /* Listen socks doesn't have a private CCID block */ |
1163 | if (sk->sk_state == DCCP_LISTEN) | |
1164 | return; | |
1165 | ||
59d203f9 | 1166 | BUG_ON(hcrx == NULL); |
2babe1f6 ACM |
1167 | |
1168 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; | |
1169 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; | |
1170 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; | |
1171 | } | |
1172 | ||
1173 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) | |
1174 | { | |
59725dc2 | 1175 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
2babe1f6 | 1176 | |
59c2353d ACM |
1177 | /* Listen socks doesn't have a private CCID block */ |
1178 | if (sk->sk_state == DCCP_LISTEN) | |
1179 | return; | |
1180 | ||
59d203f9 | 1181 | BUG_ON(hctx == NULL); |
2babe1f6 ACM |
1182 | |
1183 | info->tcpi_rto = hctx->ccid3hctx_t_rto; | |
1184 | info->tcpi_rtt = hctx->ccid3hctx_rtt; | |
1185 | } | |
1186 | ||
88f964db ACM |
1187 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
1188 | u32 __user *optval, int __user *optlen) | |
1189 | { | |
1190 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); | |
1191 | const void *val; | |
1192 | ||
1193 | /* Listen socks doesn't have a private CCID block */ | |
1194 | if (sk->sk_state == DCCP_LISTEN) | |
1195 | return -EINVAL; | |
1196 | ||
1197 | switch (optname) { | |
1198 | case DCCP_SOCKOPT_CCID_RX_INFO: | |
1199 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) | |
1200 | return -EINVAL; | |
1201 | len = sizeof(hcrx->ccid3hcrx_tfrc); | |
1202 | val = &hcrx->ccid3hcrx_tfrc; | |
1203 | break; | |
1204 | default: | |
1205 | return -ENOPROTOOPT; | |
1206 | } | |
1207 | ||
1208 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1209 | return -EFAULT; | |
1210 | ||
1211 | return 0; | |
1212 | } | |
1213 | ||
1214 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, | |
1215 | u32 __user *optval, int __user *optlen) | |
1216 | { | |
1217 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
1218 | const void *val; | |
1219 | ||
1220 | /* Listen socks doesn't have a private CCID block */ | |
1221 | if (sk->sk_state == DCCP_LISTEN) | |
1222 | return -EINVAL; | |
1223 | ||
1224 | switch (optname) { | |
1225 | case DCCP_SOCKOPT_CCID_TX_INFO: | |
1226 | if (len < sizeof(hctx->ccid3hctx_tfrc)) | |
1227 | return -EINVAL; | |
1228 | len = sizeof(hctx->ccid3hctx_tfrc); | |
1229 | val = &hctx->ccid3hctx_tfrc; | |
1230 | break; | |
1231 | default: | |
1232 | return -ENOPROTOOPT; | |
1233 | } | |
1234 | ||
1235 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1236 | return -EFAULT; | |
1237 | ||
1238 | return 0; | |
1239 | } | |
1240 | ||
91f0ebf7 | 1241 | static struct ccid_operations ccid3 = { |
3dd9a7c3 | 1242 | .ccid_id = DCCPC_CCID3, |
7c657876 ACM |
1243 | .ccid_name = "ccid3", |
1244 | .ccid_owner = THIS_MODULE, | |
91f0ebf7 | 1245 | .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), |
7c657876 ACM |
1246 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
1247 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, | |
1248 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, | |
1249 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, | |
1250 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, | |
1251 | .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, | |
1252 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, | |
91f0ebf7 | 1253 | .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), |
7c657876 ACM |
1254 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
1255 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, | |
1256 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, | |
1257 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, | |
2babe1f6 ACM |
1258 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
1259 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, | |
88f964db ACM |
1260 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
1261 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, | |
7c657876 ACM |
1262 | }; |
1263 | ||
1264 | module_param(ccid3_debug, int, 0444); | |
1265 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); | |
1266 | ||
1267 | static __init int ccid3_module_init(void) | |
1268 | { | |
8c60f3fa | 1269 | int rc = -ENOBUFS; |
7c657876 | 1270 | |
8c60f3fa ACM |
1271 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
1272 | if (ccid3_rx_hist == NULL) | |
7c657876 ACM |
1273 | goto out; |
1274 | ||
8c60f3fa ACM |
1275 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
1276 | if (ccid3_tx_hist == NULL) | |
1277 | goto out_free_rx; | |
7c657876 | 1278 | |
ae6706f0 ACM |
1279 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
1280 | if (ccid3_li_hist == NULL) | |
8c60f3fa | 1281 | goto out_free_tx; |
7c657876 ACM |
1282 | |
1283 | rc = ccid_register(&ccid3); | |
1284 | if (rc != 0) | |
1285 | goto out_free_loss_interval_history; | |
7c657876 ACM |
1286 | out: |
1287 | return rc; | |
8c60f3fa | 1288 | |
7c657876 | 1289 | out_free_loss_interval_history: |
ae6706f0 ACM |
1290 | dccp_li_hist_delete(ccid3_li_hist); |
1291 | ccid3_li_hist = NULL; | |
8c60f3fa ACM |
1292 | out_free_tx: |
1293 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1294 | ccid3_tx_hist = NULL; | |
1295 | out_free_rx: | |
1296 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1297 | ccid3_rx_hist = NULL; | |
7c657876 ACM |
1298 | goto out; |
1299 | } | |
1300 | module_init(ccid3_module_init); | |
1301 | ||
1302 | static __exit void ccid3_module_exit(void) | |
1303 | { | |
1304 | ccid_unregister(&ccid3); | |
1305 | ||
8c60f3fa ACM |
1306 | if (ccid3_tx_hist != NULL) { |
1307 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1308 | ccid3_tx_hist = NULL; | |
7c657876 | 1309 | } |
8c60f3fa ACM |
1310 | if (ccid3_rx_hist != NULL) { |
1311 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1312 | ccid3_rx_hist = NULL; | |
7c657876 | 1313 | } |
ae6706f0 ACM |
1314 | if (ccid3_li_hist != NULL) { |
1315 | dccp_li_hist_delete(ccid3_li_hist); | |
1316 | ccid3_li_hist = NULL; | |
7c657876 ACM |
1317 | } |
1318 | } | |
1319 | module_exit(ccid3_module_exit); | |
1320 | ||
e6bccd35 | 1321 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
1f2333ae | 1322 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
7c657876 ACM |
1323 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
1324 | MODULE_LICENSE("GPL"); | |
1325 | MODULE_ALIAS("net-dccp-ccid-3"); |