blob: 348e6fb262c3bef25687a6c16fc7cce912bb73ab [file] [log] [blame]
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001/*
2 * net/dccp/ccids/ccid3.c
3 *
4 * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
Ian McDonald1bc09862005-08-20 00:23:43 -03005 * Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07006 *
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/
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070011 *
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
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -030037#include <linux/config.h>
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070038#include "../ccid.h"
39#include "../dccp.h"
Arnaldo Carvalho de Melo4524b252005-08-27 23:18:26 -030040#include "lib/packet_history.h"
Arnaldo Carvalho de Meloae6706f2005-08-27 23:03:09 -030041#include "lib/loss_interval.h"
Arnaldo Carvalho de Melo36729c12005-08-28 00:47:15 -030042#include "lib/tfrc.h"
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070043#include "ccid3.h"
44
Arnaldo Carvalho de Melo6b5e6332005-08-27 20:11:28 -030045/*
Arnaldo Carvalho de Melo0ba7a3b2005-09-09 02:28:47 -030046 * Reason for maths here is to avoid 32 bit overflow when a is big.
47 * With this we get close to the limit.
Arnaldo Carvalho de Melo6b5e6332005-08-27 20:11:28 -030048 */
49static inline u32 usecs_div(const u32 a, const u32 b)
50{
Arnaldo Carvalho de Melo0ba7a3b2005-09-09 02:28:47 -030051 const u32 div = a < (UINT_MAX / (USEC_PER_SEC / 10)) ? 10 :
52 a < (UINT_MAX / (USEC_PER_SEC / 50)) ? 50 :
53 a < (UINT_MAX / (USEC_PER_SEC / 100)) ? 100 :
54 a < (UINT_MAX / (USEC_PER_SEC / 500)) ? 500 :
55 a < (UINT_MAX / (USEC_PER_SEC / 1000)) ? 1000 :
56 a < (UINT_MAX / (USEC_PER_SEC / 5000)) ? 5000 :
57 a < (UINT_MAX / (USEC_PER_SEC / 10000)) ? 10000 :
58 a < (UINT_MAX / (USEC_PER_SEC / 50000)) ? 50000 :
59 100000;
60 const u32 tmp = a * (USEC_PER_SEC / div);
61 return (b >= 2 * div) ? tmp / (b / div) : tmp;
Arnaldo Carvalho de Melo6b5e6332005-08-27 20:11:28 -030062}
63
Arnaldo Carvalho de Melocfc3c522005-08-27 20:20:37 -030064static int ccid3_debug;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070065
Arnaldo Carvalho de Melocfc3c522005-08-27 20:20:37 -030066#ifdef CCID3_DEBUG
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070067#define ccid3_pr_debug(format, a...) \
68 do { if (ccid3_debug) \
69 printk(KERN_DEBUG "%s: " format, __FUNCTION__, ##a); \
70 } while (0)
71#else
72#define ccid3_pr_debug(format, a...)
73#endif
74
Arnaldo Carvalho de Meloa1d3a352005-08-13 22:42:25 -030075static struct dccp_tx_hist *ccid3_tx_hist;
76static struct dccp_rx_hist *ccid3_rx_hist;
Arnaldo Carvalho de Meloae6706f2005-08-27 23:03:09 -030077static struct dccp_li_hist *ccid3_li_hist;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070078
79static int ccid3_init(struct sock *sk)
80{
81 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
82 return 0;
83}
84
85static void ccid3_exit(struct sock *sk)
86{
87 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
88}
89
90/* TFRC sender states */
91enum ccid3_hc_tx_states {
92 TFRC_SSTATE_NO_SENT = 1,
93 TFRC_SSTATE_NO_FBACK,
94 TFRC_SSTATE_FBACK,
95 TFRC_SSTATE_TERM,
96};
97
98#ifdef CCID3_DEBUG
99static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state)
100{
101 static char *ccid3_state_names[] = {
102 [TFRC_SSTATE_NO_SENT] = "NO_SENT",
103 [TFRC_SSTATE_NO_FBACK] = "NO_FBACK",
104 [TFRC_SSTATE_FBACK] = "FBACK",
105 [TFRC_SSTATE_TERM] = "TERM",
106 };
107
108 return ccid3_state_names[state];
109}
110#endif
111
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300112static inline void ccid3_hc_tx_set_state(struct sock *sk,
113 enum ccid3_hc_tx_states state)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700114{
115 struct dccp_sock *dp = dccp_sk(sk);
116 struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
117 enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state;
118
119 ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300120 dccp_role(sk), sk, ccid3_tx_state_name(oldstate),
121 ccid3_tx_state_name(state));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700122 WARN_ON(state == oldstate);
123 hctx->ccid3hctx_state = state;
124}
125
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700126/* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */
127static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock *hctx)
128{
Arnaldo Carvalho de Melo6b5e6332005-08-27 20:11:28 -0300129 /*
130 * If no feedback spec says t_ipi is 1 second (set elsewhere and then
131 * doubles after every no feedback timer (separate function)
132 */
133 if (hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK)
134 hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s,
135 hctx->ccid3hctx_x);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700136}
137
138/* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */
139static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx)
140{
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300141 hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2,
142 TFRC_OPSYS_HALF_TIME_GRAN);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700143}
144
145/*
146 * Update X by
147 * If (p > 0)
148 * x_calc = calcX(s, R, p);
149 * X = max(min(X_calc, 2 * X_recv), s / t_mbi);
150 * Else
151 * If (now - tld >= R)
152 * X = max(min(2 * X, 2 * X_recv), s / R);
153 * tld = now;
154 */
155static void ccid3_hc_tx_update_x(struct sock *sk)
156{
157 struct dccp_sock *dp = dccp_sk(sk);
158 struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
159
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300160 /* To avoid large error in calcX */
161 if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) {
Arnaldo Carvalho de Melo36729c12005-08-28 00:47:15 -0300162 hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s,
163 hctx->ccid3hctx_rtt,
164 hctx->ccid3hctx_p);
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300165 hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc,
166 2 * hctx->ccid3hctx_x_recv),
167 (hctx->ccid3hctx_s /
168 TFRC_MAX_BACK_OFF_TIME));
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300169 } else {
170 struct timeval now;
171
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -0300172 dccp_timestamp(sk, &now);
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300173 if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >=
174 hctx->ccid3hctx_rtt) {
Arnaldo Carvalho de Melo6b5e6332005-08-27 20:11:28 -0300175 hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv,
176 hctx->ccid3hctx_x) * 2,
177 usecs_div(hctx->ccid3hctx_s,
178 hctx->ccid3hctx_rtt));
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300179 hctx->ccid3hctx_t_ld = now;
180 }
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700181 }
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700182}
183
184static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
185{
186 struct sock *sk = (struct sock *)data;
187 struct dccp_sock *dp = dccp_sk(sk);
188 unsigned long next_tmout = 0;
189 struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700190
191 bh_lock_sock(sk);
192 if (sock_owned_by_user(sk)) {
193 /* Try again later. */
194 /* XXX: set some sensible MIB */
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300195 sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
196 jiffies + HZ / 5);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700197 goto out;
198 }
199
200 ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk,
201 ccid3_tx_state_name(hctx->ccid3hctx_state));
202
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700203 switch (hctx->ccid3hctx_state) {
204 case TFRC_SSTATE_TERM:
205 goto out;
206 case TFRC_SSTATE_NO_FBACK:
207 /* Halve send rate */
208 hctx->ccid3hctx_x /= 2;
Arnaldo Carvalho de Melo6b5e6332005-08-27 20:11:28 -0300209 if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s /
210 TFRC_MAX_BACK_OFF_TIME))
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300211 hctx->ccid3hctx_x = (hctx->ccid3hctx_s /
212 TFRC_MAX_BACK_OFF_TIME);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700213
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300214 ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d "
215 "bytes/s\n",
216 dccp_role(sk), sk,
217 ccid3_tx_state_name(hctx->ccid3hctx_state),
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700218 hctx->ccid3hctx_x);
Arnaldo Carvalho de Melo6b5e6332005-08-27 20:11:28 -0300219 next_tmout = max_t(u32, 2 * usecs_div(hctx->ccid3hctx_s,
220 hctx->ccid3hctx_x),
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300221 TFRC_INITIAL_TIMEOUT);
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300222 /*
223 * FIXME - not sure above calculation is correct. See section
224 * 5 of CCID3 11 should adjust tx_t_ipi and double that to
225 * achieve it really
226 */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700227 break;
228 case TFRC_SSTATE_FBACK:
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300229 /*
230 * Check if IDLE since last timeout and recv rate is less than
231 * 4 packets per RTT
232 */
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300233 if (!hctx->ccid3hctx_idle ||
Arnaldo Carvalho de Melo6b5e6332005-08-27 20:11:28 -0300234 (hctx->ccid3hctx_x_recv >=
235 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) {
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300236 ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n",
237 dccp_role(sk), sk,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700238 ccid3_tx_state_name(hctx->ccid3hctx_state));
239 /* Halve sending rate */
240
241 /* If (X_calc > 2 * X_recv)
242 * X_recv = max(X_recv / 2, s / (2 * t_mbi));
243 * Else
244 * X_recv = X_calc / 4;
245 */
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300246 BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P &&
247 hctx->ccid3hctx_x_calc == 0);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700248
249 /* check also if p is zero -> x_calc is infinity? */
250 if (hctx->ccid3hctx_p < TFRC_SMALLEST_P ||
251 hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv)
252 hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2,
253 hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME));
254 else
255 hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4;
256
257 /* Update sending rate */
258 ccid3_hc_tx_update_x(sk);
259 }
Arnaldo Carvalho de Melo6b5e6332005-08-27 20:11:28 -0300260 /*
261 * Schedule no feedback timer to expire in
262 * max(4 * R, 2 * s / X)
263 */
Arnaldo Carvalho de Meloc68e64c2005-08-21 05:07:37 -0300264 next_tmout = max_t(u32, hctx->ccid3hctx_t_rto,
Arnaldo Carvalho de Melo6b5e6332005-08-27 20:11:28 -0300265 2 * usecs_div(hctx->ccid3hctx_s,
266 hctx->ccid3hctx_x));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700267 break;
268 default:
269 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
270 __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
271 dump_stack();
272 goto out;
273 }
274
275 sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300276 jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout)));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700277 hctx->ccid3hctx_idle = 1;
278out:
279 bh_unlock_sock(sk);
280 sock_put(sk);
281}
282
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700283static int ccid3_hc_tx_send_packet(struct sock *sk,
284 struct sk_buff *skb, int len)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700285{
286 struct dccp_sock *dp = dccp_sk(sk);
287 struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300288 struct dccp_tx_hist_entry *new_packet;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700289 struct timeval now;
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700290 long delay;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700291 int rc = -ENOTCONN;
292
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300293 /* Check if pure ACK or Terminating*/
294
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700295 /*
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300296 * XXX: We only call this function for DATA and DATAACK, on, these
297 * packets can have zero length, but why the comment about "pure ACK"?
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700298 */
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300299 if (hctx == NULL || len == 0 ||
300 hctx->ccid3hctx_state == TFRC_SSTATE_TERM)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700301 goto out;
302
303 /* See if last packet allocated was not sent */
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300304 new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
305 if (new_packet == NULL || new_packet->dccphtx_sent) {
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300306 new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist,
307 SLAB_ATOMIC);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700308
309 rc = -ENOBUFS;
310 if (new_packet == NULL) {
311 ccid3_pr_debug("%s, sk=%p, not enough mem to add "
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300312 "to history, send refused\n",
313 dccp_role(sk), sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700314 goto out;
315 }
316
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300317 dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700318 }
319
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -0300320 dccp_timestamp(sk, &now);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700321
322 switch (hctx->ccid3hctx_state) {
323 case TFRC_SSTATE_NO_SENT:
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300324 ccid3_pr_debug("%s, sk=%p, first packet(%llu)\n",
325 dccp_role(sk), sk, dp->dccps_gss);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700326
327 hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer;
328 hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk;
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300329 sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
330 jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700331 hctx->ccid3hctx_last_win_count = 0;
332 hctx->ccid3hctx_t_last_win_count = now;
333 ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK);
334 hctx->ccid3hctx_t_ipi = TFRC_INITIAL_TIMEOUT;
335
336 /* Set nominal send time for initial packet */
337 hctx->ccid3hctx_t_nom = now;
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300338 timeval_add_usecs(&hctx->ccid3hctx_t_nom,
339 hctx->ccid3hctx_t_ipi);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700340 ccid3_calc_new_delta(hctx);
341 rc = 0;
342 break;
343 case TFRC_SSTATE_NO_FBACK:
344 case TFRC_SSTATE_FBACK:
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300345 delay = (timeval_delta(&now, &hctx->ccid3hctx_t_nom) -
346 hctx->ccid3hctx_delta);
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700347 ccid3_pr_debug("send_packet delay=%ld\n", delay);
348 delay /= -1000;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700349 /* divide by -1000 is to convert to ms and get sign right */
Arnaldo Carvalho de Melod6809c12005-08-27 03:06:35 -0300350 rc = delay > 0 ? delay : 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700351 break;
352 default:
353 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
354 __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
355 dump_stack();
356 rc = -EINVAL;
357 break;
358 }
359
360 /* Can we send? if so add options and add to packet history */
Arnaldo Carvalho de Melo507d37c2005-09-09 02:30:07 -0300361 if (rc == 0) {
362 dp->dccps_hc_tx_insert_options = 1;
Arnaldo Carvalho de Meloc1734372005-08-13 20:34:23 -0300363 new_packet->dccphtx_ccval =
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300364 DCCP_SKB_CB(skb)->dccpd_ccval =
365 hctx->ccid3hctx_last_win_count;
Arnaldo Carvalho de Melo507d37c2005-09-09 02:30:07 -0300366 }
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700367out:
368 return rc;
369}
370
371static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
372{
373 struct dccp_sock *dp = dccp_sk(sk);
374 struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700375 struct timeval now;
376
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700377 BUG_ON(hctx == NULL);
378
379 if (hctx->ccid3hctx_state == TFRC_SSTATE_TERM) {
380 ccid3_pr_debug("%s, sk=%p, while state is TFRC_SSTATE_TERM!\n",
381 dccp_role(sk), sk);
382 return;
383 }
384
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -0300385 dccp_timestamp(sk, &now);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700386
387 /* check if we have sent a data packet */
388 if (len > 0) {
389 unsigned long quarter_rtt;
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300390 struct dccp_tx_hist_entry *packet;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700391
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300392 packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
393 if (packet == NULL) {
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300394 printk(KERN_CRIT "%s: packet doesn't exists in "
395 "history!\n", __FUNCTION__);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700396 return;
397 }
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300398 if (packet->dccphtx_sent) {
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300399 printk(KERN_CRIT "%s: no unsent packet in history!\n",
400 __FUNCTION__);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700401 return;
402 }
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300403 packet->dccphtx_tstamp = now;
404 packet->dccphtx_seqno = dp->dccps_gss;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700405 /*
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300406 * Check if win_count have changed
407 * Algorithm in "8.1. Window Counter Valuer" in
408 * draft-ietf-dccp-ccid3-11.txt
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700409 */
Arnaldo Carvalho de Melo6b5e6332005-08-27 20:11:28 -0300410 quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count);
411 if (likely(hctx->ccid3hctx_rtt > 8))
412 quarter_rtt /= hctx->ccid3hctx_rtt / 4;
413
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700414 if (quarter_rtt > 0) {
415 hctx->ccid3hctx_t_last_win_count = now;
416 hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count +
417 min_t(unsigned long, quarter_rtt, 5)) % 16;
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300418 ccid3_pr_debug("%s, sk=%p, window changed from "
419 "%u to %u!\n",
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700420 dccp_role(sk), sk,
Arnaldo Carvalho de Meloc1734372005-08-13 20:34:23 -0300421 packet->dccphtx_ccval,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700422 hctx->ccid3hctx_last_win_count);
423 }
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300424
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700425 hctx->ccid3hctx_idle = 0;
Arnaldo Carvalho de Meloc1734372005-08-13 20:34:23 -0300426 packet->dccphtx_rtt = hctx->ccid3hctx_rtt;
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300427 packet->dccphtx_sent = 1;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700428 } else
429 ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n",
430 dccp_role(sk), sk, dp->dccps_gss);
431
432 switch (hctx->ccid3hctx_state) {
433 case TFRC_SSTATE_NO_SENT:
434 /* if first wasn't pure ack */
435 if (len != 0)
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300436 printk(KERN_CRIT "%s: %s, First packet sent is noted "
437 "as a data packet\n",
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700438 __FUNCTION__, dccp_role(sk));
439 return;
440 case TFRC_SSTATE_NO_FBACK:
441 case TFRC_SSTATE_FBACK:
442 if (len > 0) {
443 hctx->ccid3hctx_t_nom = now;
444 ccid3_calc_new_t_ipi(hctx);
445 ccid3_calc_new_delta(hctx);
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300446 timeval_add_usecs(&hctx->ccid3hctx_t_nom,
447 hctx->ccid3hctx_t_ipi);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700448 }
449 break;
450 default:
451 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
452 __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
453 dump_stack();
454 break;
455 }
456}
457
458static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
459{
460 struct dccp_sock *dp = dccp_sk(sk);
461 struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
462 struct ccid3_options_received *opt_recv;
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300463 struct dccp_tx_hist_entry *packet;
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -0300464 struct timeval now;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700465 unsigned long next_tmout;
Ian McDonald1bc09862005-08-20 00:23:43 -0300466 u32 t_elapsed;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700467 u32 pinv;
468 u32 x_recv;
469 u32 r_sample;
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300470
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700471 if (hctx == NULL)
472 return;
473
474 if (hctx->ccid3hctx_state == TFRC_SSTATE_TERM) {
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300475 ccid3_pr_debug("%s, sk=%p, received a packet when "
476 "terminating!\n", dccp_role(sk), sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700477 return;
478 }
479
480 /* we are only interested in ACKs */
481 if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK ||
482 DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK))
483 return;
484
485 opt_recv = &hctx->ccid3hctx_options_received;
486
Arnaldo Carvalho de Melo1a285992005-09-09 02:32:56 -0300487 t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700488 x_recv = opt_recv->ccid3or_receive_rate;
489 pinv = opt_recv->ccid3or_loss_event_rate;
490
491 switch (hctx->ccid3hctx_state) {
492 case TFRC_SSTATE_NO_SENT:
493 /* FIXME: what to do here? */
494 return;
495 case TFRC_SSTATE_NO_FBACK:
496 case TFRC_SSTATE_FBACK:
497 /* Calculate new round trip sample by
498 * R_sample = (now - t_recvdata) - t_delay */
499 /* get t_recvdata from history */
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300500 packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist,
501 DCCP_SKB_CB(skb)->dccpd_ack_seq);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700502 if (packet == NULL) {
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300503 ccid3_pr_debug("%s, sk=%p, seqno %llu(%s) does't "
504 "exist in history!\n",
505 dccp_role(sk), sk,
506 DCCP_SKB_CB(skb)->dccpd_ack_seq,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700507 dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
508 return;
509 }
510
511 /* Update RTT */
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -0300512 dccp_timestamp(sk, &now);
513 r_sample = timeval_delta(&now, &packet->dccphtx_tstamp);
Arnaldo Carvalho de Melo1a285992005-09-09 02:32:56 -0300514 if (unlikely(r_sample <= t_elapsed))
515 LIMIT_NETDEBUG(KERN_WARNING
516 "%s: r_sample=%uus, t_elapsed=%uus\n",
517 __FUNCTION__, r_sample, t_elapsed);
518 else
519 r_sample -= t_elapsed;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700520
521 /* Update RTT estimate by
522 * If (No feedback recv)
523 * R = R_sample;
524 * Else
525 * R = q * R + (1 - q) * R_sample;
526 *
527 * q is a constant, RFC 3448 recomments 0.9
528 */
529 if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) {
530 ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK);
531 hctx->ccid3hctx_rtt = r_sample;
532 } else
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300533 hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 +
534 r_sample / 10;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700535
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300536 ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, "
537 "r_sample=%us\n", dccp_role(sk), sk,
538 hctx->ccid3hctx_rtt, r_sample);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700539
540 /* Update timeout interval */
Arnaldo Carvalho de Meloc68e64c2005-08-21 05:07:37 -0300541 hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt,
542 USEC_PER_SEC);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700543
544 /* Update receive rate */
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300545 hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700546
547 /* Update loss event rate */
548 if (pinv == ~0 || pinv == 0)
549 hctx->ccid3hctx_p = 0;
550 else {
551 hctx->ccid3hctx_p = 1000000 / pinv;
552
553 if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) {
554 hctx->ccid3hctx_p = TFRC_SMALLEST_P;
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300555 ccid3_pr_debug("%s, sk=%p, Smallest p used!\n",
556 dccp_role(sk), sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700557 }
558 }
559
560 /* unschedule no feedback timer */
561 sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
562
563 /* Update sending rate */
564 ccid3_hc_tx_update_x(sk);
565
566 /* Update next send time */
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300567 timeval_sub_usecs(&hctx->ccid3hctx_t_nom,
568 hctx->ccid3hctx_t_ipi);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700569 ccid3_calc_new_t_ipi(hctx);
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300570 timeval_add_usecs(&hctx->ccid3hctx_t_nom,
571 hctx->ccid3hctx_t_ipi);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700572 ccid3_calc_new_delta(hctx);
573
574 /* remove all packets older than the one acked from history */
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300575 dccp_tx_hist_purge_older(ccid3_tx_hist,
576 &hctx->ccid3hctx_hist, packet);
Arnaldo Carvalho de Meloc530cfb2005-08-29 02:15:54 -0300577 /*
578 * As we have calculated new ipi, delta, t_nom it is possible that
579 * we now can send a packet, so wake up dccp_wait_for_ccids.
580 */
581 sk->sk_write_space(sk);
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300582
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300583 /*
584 * Schedule no feedback timer to expire in
585 * max(4 * R, 2 * s / X)
586 */
Arnaldo Carvalho de Meloc68e64c2005-08-21 05:07:37 -0300587 next_tmout = max(hctx->ccid3hctx_t_rto,
Arnaldo Carvalho de Melo6b5e6332005-08-27 20:11:28 -0300588 2 * usecs_div(hctx->ccid3hctx_s,
589 hctx->ccid3hctx_x));
590
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300591 ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to "
592 "expire in %lu jiffies (%luus)\n",
593 dccp_role(sk), sk,
594 usecs_to_jiffies(next_tmout), next_tmout);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700595
596 sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300597 jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout)));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700598
599 /* set idle flag */
600 hctx->ccid3hctx_idle = 1;
601 break;
602 default:
603 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
604 __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
605 dump_stack();
606 break;
607 }
608}
609
610static void ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb)
611{
612 const struct dccp_sock *dp = dccp_sk(sk);
613 struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
614
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300615 if (hctx == NULL || !(sk->sk_state == DCCP_OPEN ||
616 sk->sk_state == DCCP_PARTOPEN))
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700617 return;
618
619 DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count;
620}
621
622static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300623 unsigned char len, u16 idx,
624 unsigned char *value)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700625{
626 int rc = 0;
627 struct dccp_sock *dp = dccp_sk(sk);
628 struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
629 struct ccid3_options_received *opt_recv;
630
631 if (hctx == NULL)
632 return 0;
633
634 opt_recv = &hctx->ccid3hctx_options_received;
635
636 if (opt_recv->ccid3or_seqno != dp->dccps_gsr) {
637 opt_recv->ccid3or_seqno = dp->dccps_gsr;
638 opt_recv->ccid3or_loss_event_rate = ~0;
639 opt_recv->ccid3or_loss_intervals_idx = 0;
640 opt_recv->ccid3or_loss_intervals_len = 0;
641 opt_recv->ccid3or_receive_rate = 0;
642 }
643
644 switch (option) {
645 case TFRC_OPT_LOSS_EVENT_RATE:
646 if (len != 4) {
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300647 ccid3_pr_debug("%s, sk=%p, invalid len for "
648 "TFRC_OPT_LOSS_EVENT_RATE\n",
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700649 dccp_role(sk), sk);
650 rc = -EINVAL;
651 } else {
652 opt_recv->ccid3or_loss_event_rate = ntohl(*(u32 *)value);
653 ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n",
654 dccp_role(sk), sk,
655 opt_recv->ccid3or_loss_event_rate);
656 }
657 break;
658 case TFRC_OPT_LOSS_INTERVALS:
659 opt_recv->ccid3or_loss_intervals_idx = idx;
660 opt_recv->ccid3or_loss_intervals_len = len;
661 ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n",
662 dccp_role(sk), sk,
663 opt_recv->ccid3or_loss_intervals_idx,
664 opt_recv->ccid3or_loss_intervals_len);
665 break;
666 case TFRC_OPT_RECEIVE_RATE:
667 if (len != 4) {
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300668 ccid3_pr_debug("%s, sk=%p, invalid len for "
669 "TFRC_OPT_RECEIVE_RATE\n",
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700670 dccp_role(sk), sk);
671 rc = -EINVAL;
672 } else {
673 opt_recv->ccid3or_receive_rate = ntohl(*(u32 *)value);
674 ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n",
675 dccp_role(sk), sk,
676 opt_recv->ccid3or_receive_rate);
677 }
678 break;
679 }
680
681 return rc;
682}
683
684static int ccid3_hc_tx_init(struct sock *sk)
685{
686 struct dccp_sock *dp = dccp_sk(sk);
687 struct ccid3_hc_tx_sock *hctx;
688
689 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
690
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300691 hctx = dp->dccps_hc_tx_ccid_private = kmalloc(sizeof(*hctx),
692 gfp_any());
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700693 if (hctx == NULL)
694 return -ENOMEM;
695
696 memset(hctx, 0, sizeof(*hctx));
697
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300698 if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE &&
699 dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE)
700 hctx->ccid3hctx_s = dp->dccps_packet_size;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700701 else
702 hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE;
703
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300704 /* Set transmission rate to 1 packet per second */
705 hctx->ccid3hctx_x = hctx->ccid3hctx_s;
Arnaldo Carvalho de Meloc68e64c2005-08-21 05:07:37 -0300706 hctx->ccid3hctx_t_rto = USEC_PER_SEC;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700707 hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT;
708 INIT_LIST_HEAD(&hctx->ccid3hctx_hist);
709 init_timer(&hctx->ccid3hctx_no_feedback_timer);
710
711 return 0;
712}
713
714static void ccid3_hc_tx_exit(struct sock *sk)
715{
716 struct dccp_sock *dp = dccp_sk(sk);
717 struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700718
719 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
720 BUG_ON(hctx == NULL);
721
722 ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM);
723 sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
724
725 /* Empty packet history */
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300726 dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700727
728 kfree(dp->dccps_hc_tx_ccid_private);
729 dp->dccps_hc_tx_ccid_private = NULL;
730}
731
732/*
733 * RX Half Connection methods
734 */
735
736/* TFRC receiver states */
737enum ccid3_hc_rx_states {
738 TFRC_RSTATE_NO_DATA = 1,
739 TFRC_RSTATE_DATA,
740 TFRC_RSTATE_TERM = 127,
741};
742
743#ifdef CCID3_DEBUG
744static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state)
745{
746 static char *ccid3_rx_state_names[] = {
747 [TFRC_RSTATE_NO_DATA] = "NO_DATA",
748 [TFRC_RSTATE_DATA] = "DATA",
749 [TFRC_RSTATE_TERM] = "TERM",
750 };
751
752 return ccid3_rx_state_names[state];
753}
754#endif
755
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300756static inline void ccid3_hc_rx_set_state(struct sock *sk,
757 enum ccid3_hc_rx_states state)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700758{
759 struct dccp_sock *dp = dccp_sk(sk);
760 struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
761 enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state;
762
763 ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300764 dccp_role(sk), sk, ccid3_rx_state_name(oldstate),
765 ccid3_rx_state_name(state));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700766 WARN_ON(state == oldstate);
767 hcrx->ccid3hcrx_state = state;
768}
769
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700770static void ccid3_hc_rx_send_feedback(struct sock *sk)
771{
772 struct dccp_sock *dp = dccp_sk(sk);
773 struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300774 struct dccp_rx_hist_entry *packet;
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300775 struct timeval now;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700776
777 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
778
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -0300779 dccp_timestamp(sk, &now);
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300780
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700781 switch (hcrx->ccid3hcrx_state) {
782 case TFRC_RSTATE_NO_DATA:
783 hcrx->ccid3hcrx_x_recv = 0;
784 break;
785 case TFRC_RSTATE_DATA: {
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300786 const u32 delta = timeval_delta(&now,
787 &hcrx->ccid3hcrx_tstamp_last_feedback);
Arnaldo Carvalho de Melo27ae543e2005-09-09 02:31:07 -0300788 hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv,
789 delta);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700790 }
791 break;
792 default:
793 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
794 __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state);
795 dump_stack();
796 return;
797 }
798
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300799 packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700800 if (packet == NULL) {
801 printk(KERN_CRIT "%s: %s, sk=%p, no data packet in history!\n",
802 __FUNCTION__, dccp_role(sk), sk);
803 dump_stack();
804 return;
805 }
806
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300807 hcrx->ccid3hcrx_tstamp_last_feedback = now;
Arnaldo Carvalho de Meloc1734372005-08-13 20:34:23 -0300808 hcrx->ccid3hcrx_last_counter = packet->dccphrx_ccval;
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300809 hcrx->ccid3hcrx_seqno_last_counter = packet->dccphrx_seqno;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700810 hcrx->ccid3hcrx_bytes_recv = 0;
811
812 /* Convert to multiples of 10us */
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300813 hcrx->ccid3hcrx_elapsed_time =
814 timeval_delta(&now, &packet->dccphrx_tstamp) / 10;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700815 if (hcrx->ccid3hcrx_p == 0)
816 hcrx->ccid3hcrx_pinv = ~0;
817 else
818 hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p;
Arnaldo Carvalho de Melo507d37c2005-09-09 02:30:07 -0300819 dp->dccps_hc_rx_insert_options = 1;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700820 dccp_send_ack(sk);
821}
822
823static void ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
824{
825 const struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Melo4fded332005-08-23 21:51:59 -0700826 u32 x_recv, pinv;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700827 struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
828
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300829 if (hcrx == NULL || !(sk->sk_state == DCCP_OPEN ||
830 sk->sk_state == DCCP_PARTOPEN))
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700831 return;
832
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700833 DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_last_counter;
Arnaldo Carvalho de Melo4fded332005-08-23 21:51:59 -0700834
835 if (dccp_packet_without_ack(skb))
836 return;
837
838 if (hcrx->ccid3hcrx_elapsed_time != 0)
839 dccp_insert_option_elapsed_time(sk, skb,
840 hcrx->ccid3hcrx_elapsed_time);
841 dccp_insert_option_timestamp(sk, skb);
842 x_recv = htonl(hcrx->ccid3hcrx_x_recv);
843 pinv = htonl(hcrx->ccid3hcrx_pinv);
844 dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE,
845 &pinv, sizeof(pinv));
846 dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE,
847 &x_recv, sizeof(x_recv));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700848}
849
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700850/* calculate first loss interval
851 *
852 * returns estimated loss interval in usecs */
853
854static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
855{
856 struct dccp_sock *dp = dccp_sk(sk);
857 struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300858 struct dccp_rx_hist_entry *entry, *next, *tail = NULL;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700859 u32 rtt, delta, x_recv, fval, p, tmp2;
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300860 struct timeval tstamp = { 0, };
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700861 int interval = 0;
862 int win_count = 0;
863 int step = 0;
864 u64 tmp1;
865
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300866 list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist,
867 dccphrx_node) {
868 if (dccp_rx_hist_entry_data_packet(entry)) {
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700869 tail = entry;
870
871 switch (step) {
872 case 0:
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300873 tstamp = entry->dccphrx_tstamp;
Arnaldo Carvalho de Meloc1734372005-08-13 20:34:23 -0300874 win_count = entry->dccphrx_ccval;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700875 step = 1;
876 break;
877 case 1:
Arnaldo Carvalho de Meloc1734372005-08-13 20:34:23 -0300878 interval = win_count - entry->dccphrx_ccval;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700879 if (interval < 0)
880 interval += TFRC_WIN_COUNT_LIMIT;
881 if (interval > 4)
882 goto found;
883 break;
884 }
885 }
886 }
887
888 if (step == 0) {
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300889 printk(KERN_CRIT "%s: %s, sk=%p, packet history contains no "
890 "data packets!\n",
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700891 __FUNCTION__, dccp_role(sk), sk);
892 return ~0;
893 }
894
895 if (interval == 0) {
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300896 ccid3_pr_debug("%s, sk=%p, Could not find a win_count "
897 "interval > 0. Defaulting to 1\n",
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700898 dccp_role(sk), sk);
899 interval = 1;
900 }
901found:
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300902 rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700903 ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n",
904 dccp_role(sk), sk, rtt);
905 if (rtt == 0)
906 rtt = 1;
907
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -0300908 dccp_timestamp(sk, &tstamp);
909 delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback);
910 x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700911
912 tmp1 = (u64)x_recv * (u64)rtt;
913 do_div(tmp1,10000000);
914 tmp2 = (u32)tmp1;
915 fval = (hcrx->ccid3hcrx_s * 100000) / tmp2;
916 /* do not alter order above or you will get overflow on 32 bit */
Arnaldo Carvalho de Melo36729c12005-08-28 00:47:15 -0300917 p = tfrc_calc_x_reverse_lookup(fval);
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300918 ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied "
919 "loss rate=%u\n", dccp_role(sk), sk, x_recv, p);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700920
921 if (p == 0)
922 return ~0;
923 else
924 return 1000000 / p;
925}
926
927static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss)
928{
929 struct dccp_sock *dp = dccp_sk(sk);
930 struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700931
Arnaldo Carvalho de Meloae6706f2005-08-27 23:03:09 -0300932 if (seq_loss != DCCP_MAX_SEQNO + 1 &&
933 list_empty(&hcrx->ccid3hcrx_li_hist)) {
934 struct dccp_li_hist_entry *li_tail;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700935
Arnaldo Carvalho de Meloae6706f2005-08-27 23:03:09 -0300936 li_tail = dccp_li_hist_interval_new(ccid3_li_hist,
937 &hcrx->ccid3hcrx_li_hist,
938 seq_loss, win_loss);
939 if (li_tail == NULL)
940 return;
941 li_tail->dccplih_interval = ccid3_hc_rx_calc_first_li(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700942 }
943 /* FIXME: find end of interval */
944}
945
946static void ccid3_hc_rx_detect_loss(struct sock *sk)
947{
948 struct dccp_sock *dp = dccp_sk(sk);
949 struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
Arnaldo Carvalho de Melo29e4f8b2005-08-28 02:00:28 -0300950 u8 win_loss;
951 const u64 seq_loss = dccp_rx_hist_detect_loss(&hcrx->ccid3hcrx_hist,
952 &hcrx->ccid3hcrx_li_hist,
953 &win_loss);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700954
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700955 ccid3_hc_rx_update_li(sk, seq_loss, win_loss);
956}
957
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700958static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
959{
960 struct dccp_sock *dp = dccp_sk(sk);
961 struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
Arnaldo Carvalho de Melo4fded332005-08-23 21:51:59 -0700962 const struct dccp_options_received *opt_recv;
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -0300963 struct dccp_rx_hist_entry *packet;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700964 struct timeval now;
965 u8 win_count;
Arnaldo Carvalho de Melob3a30772005-09-09 02:34:10 -0300966 u32 p_prev, r_sample, t_elapsed;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700967 int ins;
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -0300968
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700969 if (hcrx == NULL)
970 return;
971
972 BUG_ON(!(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA ||
973 hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA));
974
Arnaldo Carvalho de Melo4fded332005-08-23 21:51:59 -0700975 opt_recv = &dp->dccps_options_received;
976
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700977 switch (DCCP_SKB_CB(skb)->dccpd_type) {
978 case DCCP_PKT_ACK:
979 if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
980 return;
981 case DCCP_PKT_DATAACK:
Arnaldo Carvalho de Melo4fded332005-08-23 21:51:59 -0700982 if (opt_recv->dccpor_timestamp_echo == 0)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700983 break;
984 p_prev = hcrx->ccid3hcrx_rtt;
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -0300985 dccp_timestamp(sk, &now);
Arnaldo Carvalho de Melob3a30772005-09-09 02:34:10 -0300986 timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10);
987 r_sample = timeval_usecs(&now);
988 t_elapsed = opt_recv->dccpor_elapsed_time * 10;
989
990 if (unlikely(r_sample <= t_elapsed))
991 LIMIT_NETDEBUG(KERN_WARNING
992 "%s: r_sample=%uus, t_elapsed=%uus\n",
993 __FUNCTION__, r_sample, t_elapsed);
994 else
995 r_sample -= t_elapsed;
996
997 if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
998 hcrx->ccid3hcrx_rtt = r_sample;
999 else
1000 hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 +
1001 r_sample / 10;
1002
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001003 if (p_prev != hcrx->ccid3hcrx_rtt)
Arnaldo Carvalho de Melo4fded332005-08-23 21:51:59 -07001004 ccid3_pr_debug("%s, New RTT=%luus, elapsed time=%u\n",
1005 dccp_role(sk), hcrx->ccid3hcrx_rtt,
1006 opt_recv->dccpor_elapsed_time);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001007 break;
1008 case DCCP_PKT_DATA:
1009 break;
1010 default:
1011 ccid3_pr_debug("%s, sk=%p, not DATA/DATAACK/ACK packet(%s)\n",
1012 dccp_role(sk), sk,
1013 dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
1014 return;
1015 }
1016
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -03001017 packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp,
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -03001018 skb, SLAB_ATOMIC);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001019 if (packet == NULL) {
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -03001020 ccid3_pr_debug("%s, sk=%p, Not enough mem to add rx packet "
1021 "to history (consider it lost)!",
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001022 dccp_role(sk), sk);
1023 return;
1024 }
1025
Arnaldo Carvalho de Meloc1734372005-08-13 20:34:23 -03001026 win_count = packet->dccphrx_ccval;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001027
Arnaldo Carvalho de Melo072ab6c2005-08-28 01:19:14 -03001028 ins = dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist,
1029 &hcrx->ccid3hcrx_li_hist, packet);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001030
1031 if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK)
1032 return;
1033
1034 switch (hcrx->ccid3hcrx_state) {
1035 case TFRC_RSTATE_NO_DATA:
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -03001036 ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial "
1037 "feedback\n",
1038 dccp_role(sk), sk,
1039 dccp_state_name(sk->sk_state), skb);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001040 ccid3_hc_rx_send_feedback(sk);
1041 ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA);
1042 return;
1043 case TFRC_RSTATE_DATA:
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -03001044 hcrx->ccid3hcrx_bytes_recv += skb->len -
1045 dccp_hdr(skb)->dccph_doff * 4;
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -03001046 if (ins != 0)
1047 break;
1048
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -03001049 dccp_timestamp(sk, &now);
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -03001050 if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >=
1051 hcrx->ccid3hcrx_rtt) {
1052 hcrx->ccid3hcrx_tstamp_last_ack = now;
1053 ccid3_hc_rx_send_feedback(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001054 }
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -03001055 return;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001056 default:
1057 printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
1058 __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state);
1059 dump_stack();
1060 return;
1061 }
1062
1063 /* Dealing with packet loss */
Arnaldo Carvalho de Melo4fded332005-08-23 21:51:59 -07001064 ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n",
1065 dccp_role(sk), sk, dccp_state_name(sk->sk_state));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001066
1067 ccid3_hc_rx_detect_loss(sk);
1068 p_prev = hcrx->ccid3hcrx_p;
1069
1070 /* Calculate loss event rate */
Arnaldo Carvalho de Meloae6706f2005-08-27 23:03:09 -03001071 if (!list_empty(&hcrx->ccid3hcrx_li_hist))
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001072 /* Scaling up by 1000000 as fixed decimal */
Arnaldo Carvalho de Meloae6706f2005-08-27 23:03:09 -03001073 hcrx->ccid3hcrx_p = 1000000 / dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001074
1075 if (hcrx->ccid3hcrx_p > p_prev) {
1076 ccid3_hc_rx_send_feedback(sk);
1077 return;
1078 }
1079}
1080
1081static int ccid3_hc_rx_init(struct sock *sk)
1082{
1083 struct dccp_sock *dp = dccp_sk(sk);
1084 struct ccid3_hc_rx_sock *hcrx;
1085
1086 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
1087
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -03001088 hcrx = dp->dccps_hc_rx_ccid_private = kmalloc(sizeof(*hcrx),
1089 gfp_any());
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001090 if (hcrx == NULL)
1091 return -ENOMEM;
1092
1093 memset(hcrx, 0, sizeof(*hcrx));
1094
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -03001095 if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE &&
1096 dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE)
1097 hcrx->ccid3hcrx_s = dp->dccps_packet_size;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001098 else
1099 hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE;
1100
1101 hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA;
1102 INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist);
Arnaldo Carvalho de Meloae6706f2005-08-27 23:03:09 -03001103 INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist);
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -03001104 dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack);
Arnaldo Carvalho de Melo954ee312005-09-09 02:37:05 -03001105 hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack;
1106 hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001107 return 0;
1108}
1109
1110static void ccid3_hc_rx_exit(struct sock *sk)
1111{
1112 struct dccp_sock *dp = dccp_sk(sk);
1113 struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
1114
1115 ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
1116
1117 if (hcrx == NULL)
1118 return;
1119
1120 ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM);
1121
1122 /* Empty packet history */
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -03001123 dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001124
1125 /* Empty loss interval history */
Arnaldo Carvalho de Meloae6706f2005-08-27 23:03:09 -03001126 dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001127
1128 kfree(dp->dccps_hc_rx_ccid_private);
1129 dp->dccps_hc_rx_ccid_private = NULL;
1130}
1131
Arnaldo Carvalho de Melo2babe1f2005-08-23 21:52:35 -07001132static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info)
1133{
1134 const struct dccp_sock *dp = dccp_sk(sk);
1135 const struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
1136
1137 if (hcrx == NULL)
1138 return;
1139
1140 info->tcpi_ca_state = hcrx->ccid3hcrx_state;
1141 info->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1142 info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt;
1143}
1144
1145static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info)
1146{
1147 const struct dccp_sock *dp = dccp_sk(sk);
1148 const struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
1149
1150 if (hctx == NULL)
1151 return;
1152
1153 info->tcpi_rto = hctx->ccid3hctx_t_rto;
1154 info->tcpi_rtt = hctx->ccid3hctx_rtt;
1155}
1156
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001157static struct ccid ccid3 = {
1158 .ccid_id = 3,
1159 .ccid_name = "ccid3",
1160 .ccid_owner = THIS_MODULE,
1161 .ccid_init = ccid3_init,
1162 .ccid_exit = ccid3_exit,
1163 .ccid_hc_tx_init = ccid3_hc_tx_init,
1164 .ccid_hc_tx_exit = ccid3_hc_tx_exit,
1165 .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet,
1166 .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent,
1167 .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv,
1168 .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options,
1169 .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options,
1170 .ccid_hc_rx_init = ccid3_hc_rx_init,
1171 .ccid_hc_rx_exit = ccid3_hc_rx_exit,
1172 .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options,
1173 .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv,
Arnaldo Carvalho de Melo2babe1f2005-08-23 21:52:35 -07001174 .ccid_hc_rx_get_info = ccid3_hc_rx_get_info,
1175 .ccid_hc_tx_get_info = ccid3_hc_tx_get_info,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001176};
1177
1178module_param(ccid3_debug, int, 0444);
1179MODULE_PARM_DESC(ccid3_debug, "Enable debug messages");
1180
1181static __init int ccid3_module_init(void)
1182{
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -03001183 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001184
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -03001185 ccid3_rx_hist = dccp_rx_hist_new("ccid3");
1186 if (ccid3_rx_hist == NULL)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001187 goto out;
1188
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -03001189 ccid3_tx_hist = dccp_tx_hist_new("ccid3");
1190 if (ccid3_tx_hist == NULL)
1191 goto out_free_rx;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001192
Arnaldo Carvalho de Meloae6706f2005-08-27 23:03:09 -03001193 ccid3_li_hist = dccp_li_hist_new("ccid3");
1194 if (ccid3_li_hist == NULL)
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -03001195 goto out_free_tx;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001196
1197 rc = ccid_register(&ccid3);
1198 if (rc != 0)
1199 goto out_free_loss_interval_history;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001200out:
1201 return rc;
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -03001202
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001203out_free_loss_interval_history:
Arnaldo Carvalho de Meloae6706f2005-08-27 23:03:09 -03001204 dccp_li_hist_delete(ccid3_li_hist);
1205 ccid3_li_hist = NULL;
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -03001206out_free_tx:
1207 dccp_tx_hist_delete(ccid3_tx_hist);
1208 ccid3_tx_hist = NULL;
1209out_free_rx:
1210 dccp_rx_hist_delete(ccid3_rx_hist);
1211 ccid3_rx_hist = NULL;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001212 goto out;
1213}
1214module_init(ccid3_module_init);
1215
1216static __exit void ccid3_module_exit(void)
1217{
Arnaldo Carvalho de Melo725ba8e2005-08-13 20:35:39 -03001218#ifdef CONFIG_IP_DCCP_UNLOAD_HACK
1219 /*
1220 * Hack to use while developing, so that we get rid of the control
1221 * sock, that is what keeps a refcount on dccp.ko -acme
1222 */
1223 extern void dccp_ctl_sock_exit(void);
1224
1225 dccp_ctl_sock_exit();
1226#endif
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001227 ccid_unregister(&ccid3);
1228
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -03001229 if (ccid3_tx_hist != NULL) {
1230 dccp_tx_hist_delete(ccid3_tx_hist);
1231 ccid3_tx_hist = NULL;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001232 }
Arnaldo Carvalho de Melo8c60f3f2005-08-10 12:59:38 -03001233 if (ccid3_rx_hist != NULL) {
1234 dccp_rx_hist_delete(ccid3_rx_hist);
1235 ccid3_rx_hist = NULL;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001236 }
Arnaldo Carvalho de Meloae6706f2005-08-27 23:03:09 -03001237 if (ccid3_li_hist != NULL) {
1238 dccp_li_hist_delete(ccid3_li_hist);
1239 ccid3_li_hist = NULL;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001240 }
1241}
1242module_exit(ccid3_module_exit);
1243
Arnaldo Carvalho de Melo1f2333a2005-08-27 03:51:58 -03001244MODULE_AUTHOR("Ian McDonald <iam4@cs.waikato.ac.nz>, "
1245 "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001246MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID");
1247MODULE_LICENSE("GPL");
1248MODULE_ALIAS("net-dccp-ccid-3");