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Commit | Line | Data |
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7c657876 ACM |
1 | /* |
2 | * net/dccp/ccids/ccid3.c | |
3 | * | |
4 | * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand. | |
e6bccd35 | 5 | * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz> |
7c657876 ACM |
6 | * |
7 | * An implementation of the DCCP protocol | |
8 | * | |
9 | * This code has been developed by the University of Waikato WAND | |
10 | * research group. For further information please see http://www.wand.net.nz/ | |
7c657876 ACM |
11 | * |
12 | * This code also uses code from Lulea University, rereleased as GPL by its | |
13 | * authors: | |
14 | * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon | |
15 | * | |
16 | * Changes to meet Linux coding standards, to make it meet latest ccid3 draft | |
17 | * and to make it work as a loadable module in the DCCP stack written by | |
18 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br>. | |
19 | * | |
20 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
21 | * | |
22 | * This program is free software; you can redistribute it and/or modify | |
23 | * it under the terms of the GNU General Public License as published by | |
24 | * the Free Software Foundation; either version 2 of the License, or | |
25 | * (at your option) any later version. | |
26 | * | |
27 | * This program is distributed in the hope that it will be useful, | |
28 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
29 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
30 | * GNU General Public License for more details. | |
31 | * | |
32 | * You should have received a copy of the GNU General Public License | |
33 | * along with this program; if not, write to the Free Software | |
34 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
35 | */ | |
7c657876 ACM |
36 | #include "../ccid.h" |
37 | #include "../dccp.h" | |
4524b259 | 38 | #include "lib/packet_history.h" |
ae6706f0 | 39 | #include "lib/loss_interval.h" |
36729c1a | 40 | #include "lib/tfrc.h" |
7c657876 ACM |
41 | #include "ccid3.h" |
42 | ||
56724aa4 GR |
43 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
44 | static int ccid3_debug; | |
45 | #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) | |
7c657876 ACM |
46 | #else |
47 | #define ccid3_pr_debug(format, a...) | |
48 | #endif | |
49 | ||
a1d3a355 ACM |
50 | static struct dccp_tx_hist *ccid3_tx_hist; |
51 | static struct dccp_rx_hist *ccid3_rx_hist; | |
ae6706f0 | 52 | static struct dccp_li_hist *ccid3_li_hist; |
7c657876 | 53 | |
9bf17475 GR |
54 | /* |
55 | * Transmitter Half-Connection Routines | |
56 | */ | |
56724aa4 | 57 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
58 | static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) |
59 | { | |
60 | static char *ccid3_state_names[] = { | |
61 | [TFRC_SSTATE_NO_SENT] = "NO_SENT", | |
62 | [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", | |
63 | [TFRC_SSTATE_FBACK] = "FBACK", | |
64 | [TFRC_SSTATE_TERM] = "TERM", | |
65 | }; | |
66 | ||
67 | return ccid3_state_names[state]; | |
68 | } | |
69 | #endif | |
70 | ||
c25a18ba ACM |
71 | static void ccid3_hc_tx_set_state(struct sock *sk, |
72 | enum ccid3_hc_tx_states state) | |
7c657876 | 73 | { |
59725dc2 | 74 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 ACM |
75 | enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; |
76 | ||
77 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
78 | dccp_role(sk), sk, ccid3_tx_state_name(oldstate), |
79 | ccid3_tx_state_name(state)); | |
7c657876 ACM |
80 | WARN_ON(state == oldstate); |
81 | hctx->ccid3hctx_state = state; | |
82 | } | |
83 | ||
a21f9f96 GR |
84 | /* |
85 | * Compute the initial sending rate X_init according to RFC 3390: | |
86 | * w_init = min(4 * MSS, max(2 * MSS, 4380 bytes)) | |
87 | * X_init = w_init / RTT | |
88 | * For consistency with other parts of the code, X_init is scaled by 2^6. | |
89 | */ | |
90 | static inline u64 rfc3390_initial_rate(struct sock *sk) | |
91 | { | |
92 | const struct dccp_sock *dp = dccp_sk(sk); | |
93 | const __u32 w_init = min(4 * dp->dccps_mss_cache, | |
94 | max(2 * dp->dccps_mss_cache, 4380U)); | |
95 | ||
96 | return scaled_div(w_init << 6, ccid3_hc_tx_sk(sk)->ccid3hctx_rtt); | |
97 | } | |
98 | ||
17893bc1 | 99 | /* |
1266adee | 100 | * Recalculate t_ipi and delta (should be called whenever X changes) |
17893bc1 | 101 | */ |
1266adee | 102 | static inline void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hctx) |
7c657876 | 103 | { |
1a21e49a | 104 | /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */ |
b2449fdc GR |
105 | hctx->ccid3hctx_t_ipi = scaled_div32(((u64)hctx->ccid3hctx_s) << 6, |
106 | hctx->ccid3hctx_x); | |
7c657876 | 107 | |
17893bc1 | 108 | /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ |
1f2333ae ACM |
109 | hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, |
110 | TFRC_OPSYS_HALF_TIME_GRAN); | |
8699be7d | 111 | |
1761f7d7 | 112 | ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n", |
8699be7d | 113 | hctx->ccid3hctx_t_ipi, hctx->ccid3hctx_delta, |
1761f7d7 | 114 | hctx->ccid3hctx_s, (unsigned)(hctx->ccid3hctx_x >> 6)); |
8699be7d | 115 | |
7c657876 | 116 | } |
7c657876 ACM |
117 | /* |
118 | * Update X by | |
119 | * If (p > 0) | |
5c3fbb6a | 120 | * X_calc = calcX(s, R, p); |
7c657876 ACM |
121 | * X = max(min(X_calc, 2 * X_recv), s / t_mbi); |
122 | * Else | |
123 | * If (now - tld >= R) | |
124 | * X = max(min(2 * X, 2 * X_recv), s / R); | |
125 | * tld = now; | |
5c3fbb6a | 126 | * |
1a21e49a GR |
127 | * Note: X and X_recv are both stored in units of 64 * bytes/second, to support |
128 | * fine-grained resolution of sending rates. This requires scaling by 2^6 | |
129 | * throughout the code. Only X_calc is unscaled (in bytes/second). | |
130 | * | |
1a21e49a | 131 | */ |
a79ef76f GR |
132 | static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now) |
133 | ||
7c657876 | 134 | { |
59725dc2 | 135 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
0c150efb | 136 | __u64 min_rate = 2 * hctx->ccid3hctx_x_recv; |
1a21e49a | 137 | const __u64 old_x = hctx->ccid3hctx_x; |
7c657876 | 138 | |
0c150efb GR |
139 | /* |
140 | * Handle IDLE periods: do not reduce below RFC3390 initial sending rate | |
141 | * when idling [RFC 4342, 5.1]. See also draft-ietf-dccp-rfc3448bis. | |
142 | * For consistency with X and X_recv, min_rate is also scaled by 2^6. | |
143 | */ | |
144 | if (unlikely(hctx->ccid3hctx_idle)) { | |
145 | min_rate = rfc3390_initial_rate(sk); | |
146 | min_rate = max(min_rate, 2 * hctx->ccid3hctx_x_recv); | |
147 | } | |
148 | ||
44158306 | 149 | if (hctx->ccid3hctx_p > 0) { |
1a21e49a | 150 | |
9e8efc82 | 151 | hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6, |
0c150efb | 152 | min_rate); |
9e8efc82 GR |
153 | hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, |
154 | (((__u64)hctx->ccid3hctx_s) << 6) / | |
8109b02b | 155 | TFRC_T_MBI); |
a79ef76f | 156 | |
0f9e5b57 | 157 | } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) - |
8109b02b | 158 | (suseconds_t)hctx->ccid3hctx_rtt >= 0) { |
1a21e49a | 159 | |
9e8efc82 | 160 | hctx->ccid3hctx_x = |
0c150efb | 161 | max(min(2 * hctx->ccid3hctx_x, min_rate), |
9e8efc82 | 162 | scaled_div(((__u64)hctx->ccid3hctx_s) << 6, |
8109b02b | 163 | hctx->ccid3hctx_rtt)); |
a79ef76f | 164 | hctx->ccid3hctx_t_ld = *now; |
ff586298 | 165 | } |
b6ee3d4a | 166 | |
8699be7d | 167 | if (hctx->ccid3hctx_x != old_x) { |
1761f7d7 GR |
168 | ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, " |
169 | "X_recv=%u\n", (unsigned)(old_x >> 6), | |
170 | (unsigned)(hctx->ccid3hctx_x >> 6), | |
171 | hctx->ccid3hctx_x_calc, | |
172 | (unsigned)(hctx->ccid3hctx_x_recv >> 6)); | |
8699be7d | 173 | |
1266adee | 174 | ccid3_update_send_interval(hctx); |
8699be7d | 175 | } |
7c657876 ACM |
176 | } |
177 | ||
78ad713d | 178 | /* |
8109b02b ACM |
179 | * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) |
180 | * @len: DCCP packet payload size in bytes | |
78ad713d GR |
181 | */ |
182 | static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) | |
183 | { | |
1266adee GR |
184 | const u16 old_s = hctx->ccid3hctx_s; |
185 | ||
186 | hctx->ccid3hctx_s = old_s == 0 ? len : (9 * old_s + len) / 10; | |
187 | ||
188 | if (hctx->ccid3hctx_s != old_s) | |
189 | ccid3_update_send_interval(hctx); | |
78ad713d GR |
190 | } |
191 | ||
9f8681db | 192 | /* |
8109b02b ACM |
193 | * Update Window Counter using the algorithm from [RFC 4342, 8.1]. |
194 | * The algorithm is not applicable if RTT < 4 microseconds. | |
9f8681db GR |
195 | */ |
196 | static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, | |
197 | struct timeval *now) | |
198 | { | |
199 | suseconds_t delta; | |
200 | u32 quarter_rtts; | |
201 | ||
202 | if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ | |
203 | return; | |
204 | ||
205 | delta = timeval_delta(now, &hctx->ccid3hctx_t_last_win_count); | |
206 | DCCP_BUG_ON(delta < 0); | |
207 | ||
208 | quarter_rtts = (u32)delta / (hctx->ccid3hctx_rtt / 4); | |
209 | ||
210 | if (quarter_rtts > 0) { | |
211 | hctx->ccid3hctx_t_last_win_count = *now; | |
212 | hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); | |
213 | hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ | |
214 | ||
215 | ccid3_pr_debug("now at %#X\n", hctx->ccid3hctx_last_win_count); | |
216 | } | |
217 | } | |
218 | ||
7c657876 ACM |
219 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) |
220 | { | |
221 | struct sock *sk = (struct sock *)data; | |
59725dc2 | 222 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
0c150efb | 223 | struct timeval now; |
2a1fda6f | 224 | unsigned long t_nfb = USEC_PER_SEC / 5; |
7c657876 ACM |
225 | |
226 | bh_lock_sock(sk); | |
227 | if (sock_owned_by_user(sk)) { | |
228 | /* Try again later. */ | |
229 | /* XXX: set some sensible MIB */ | |
48e03eee | 230 | goto restart_timer; |
7c657876 ACM |
231 | } |
232 | ||
a9672411 | 233 | ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk, |
7c657876 | 234 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
a9672411 | 235 | |
0c150efb GR |
236 | hctx->ccid3hctx_idle = 1; |
237 | ||
7c657876 | 238 | switch (hctx->ccid3hctx_state) { |
7c657876 | 239 | case TFRC_SSTATE_NO_FBACK: |
a79ef76f | 240 | /* RFC 3448, 4.4: Halve send rate directly */ |
9e8efc82 GR |
241 | hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2, |
242 | (((__u64)hctx->ccid3hctx_s) << 6) / | |
243 | TFRC_T_MBI); | |
7c657876 | 244 | |
a9672411 GR |
245 | ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u " |
246 | "bytes/s\n", dccp_role(sk), sk, | |
1f2333ae | 247 | ccid3_tx_state_name(hctx->ccid3hctx_state), |
1a21e49a | 248 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
48e03eee GR |
249 | /* The value of R is still undefined and so we can not recompute |
250 | * the timout value. Keep initial value as per [RFC 4342, 5]. */ | |
2a1fda6f | 251 | t_nfb = TFRC_INITIAL_TIMEOUT; |
1266adee | 252 | ccid3_update_send_interval(hctx); |
7c657876 ACM |
253 | break; |
254 | case TFRC_SSTATE_FBACK: | |
1f2333ae | 255 | /* |
0c150efb GR |
256 | * Modify the cached value of X_recv [RFC 3448, 4.4] |
257 | * | |
258 | * If (p == 0 || X_calc > 2 * X_recv) | |
259 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); | |
260 | * Else | |
261 | * X_recv = X_calc / 4; | |
262 | * | |
263 | * Note that X_recv is scaled by 2^6 while X_calc is not | |
1f2333ae | 264 | */ |
0c150efb GR |
265 | BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); |
266 | ||
267 | if (hctx->ccid3hctx_p == 0 || | |
268 | (hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5))) { | |
269 | ||
270 | hctx->ccid3hctx_x_recv = | |
271 | max(hctx->ccid3hctx_x_recv / 2, | |
272 | (((__u64)hctx->ccid3hctx_s) << 6) / | |
273 | (2 * TFRC_T_MBI)); | |
274 | ||
275 | if (hctx->ccid3hctx_p == 0) | |
276 | dccp_timestamp(sk, &now); | |
277 | } else { | |
278 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc; | |
279 | hctx->ccid3hctx_x_recv <<= 4; | |
7c657876 | 280 | } |
0c150efb GR |
281 | /* Now recalculate X [RFC 3448, 4.3, step (4)] */ |
282 | ccid3_hc_tx_update_x(sk, &now); | |
6b5e633a ACM |
283 | /* |
284 | * Schedule no feedback timer to expire in | |
8a508ac2 GR |
285 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
286 | * See comments in packet_recv() regarding the value of t_RTO. | |
6b5e633a | 287 | */ |
8a508ac2 | 288 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
7c657876 | 289 | break; |
59348b19 | 290 | case TFRC_SSTATE_NO_SENT: |
a9672411 | 291 | DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk), sk); |
59348b19 GR |
292 | /* fall through */ |
293 | case TFRC_SSTATE_TERM: | |
7c657876 ACM |
294 | goto out; |
295 | } | |
296 | ||
48e03eee GR |
297 | restart_timer: |
298 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
c9eaf173 | 299 | jiffies + usecs_to_jiffies(t_nfb)); |
7c657876 ACM |
300 | out: |
301 | bh_unlock_sock(sk); | |
302 | sock_put(sk); | |
303 | } | |
304 | ||
7da7f456 GR |
305 | /* |
306 | * returns | |
307 | * > 0: delay (in msecs) that should pass before actually sending | |
308 | * = 0: can send immediately | |
309 | * < 0: error condition; do not send packet | |
310 | */ | |
6b57c93d | 311 | static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
312 | { |
313 | struct dccp_sock *dp = dccp_sk(sk); | |
59725dc2 | 314 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 315 | struct timeval now; |
0f9e5b57 | 316 | suseconds_t delay; |
7c657876 | 317 | |
59348b19 | 318 | BUG_ON(hctx == NULL); |
1f2333ae | 319 | |
7c657876 | 320 | /* |
da335baf GR |
321 | * This function is called only for Data and DataAck packets. Sending |
322 | * zero-sized Data(Ack)s is theoretically possible, but for congestion | |
323 | * control this case is pathological - ignore it. | |
7c657876 | 324 | */ |
6b57c93d | 325 | if (unlikely(skb->len == 0)) |
da335baf | 326 | return -EBADMSG; |
7c657876 | 327 | |
b0e56780 | 328 | dccp_timestamp(sk, &now); |
7c657876 ACM |
329 | |
330 | switch (hctx->ccid3hctx_state) { | |
331 | case TFRC_SSTATE_NO_SENT: | |
1f2333ae | 332 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
8109b02b | 333 | (jiffies + |
c9eaf173 | 334 | usecs_to_jiffies(TFRC_INITIAL_TIMEOUT))); |
7c657876 ACM |
335 | hctx->ccid3hctx_last_win_count = 0; |
336 | hctx->ccid3hctx_t_last_win_count = now; | |
90feeb95 GR |
337 | |
338 | /* Set t_0 for initial packet */ | |
7c657876 | 339 | hctx->ccid3hctx_t_nom = now; |
30833ffe GR |
340 | |
341 | hctx->ccid3hctx_s = skb->len; | |
342 | ||
343 | /* | |
344 | * Use initial RTT sample when available: recommended by erratum | |
345 | * to RFC 4342. This implements the initialisation procedure of | |
346 | * draft rfc3448bis, section 4.2. Remember, X is scaled by 2^6. | |
347 | */ | |
348 | if (dp->dccps_syn_rtt) { | |
349 | ccid3_pr_debug("SYN RTT = %uus\n", dp->dccps_syn_rtt); | |
350 | hctx->ccid3hctx_rtt = dp->dccps_syn_rtt; | |
351 | hctx->ccid3hctx_x = rfc3390_initial_rate(sk); | |
352 | hctx->ccid3hctx_t_ld = now; | |
353 | } else { | |
354 | /* Sender does not have RTT sample: X = MSS/second */ | |
355 | hctx->ccid3hctx_x = dp->dccps_mss_cache; | |
356 | hctx->ccid3hctx_x <<= 6; | |
357 | } | |
358 | ccid3_update_send_interval(hctx); | |
359 | ||
360 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); | |
7c657876 ACM |
361 | break; |
362 | case TFRC_SSTATE_NO_FBACK: | |
363 | case TFRC_SSTATE_FBACK: | |
91cf5a17 | 364 | delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); |
8699be7d | 365 | ccid3_pr_debug("delay=%ld\n", (long)delay); |
91cf5a17 | 366 | /* |
8109b02b | 367 | * Scheduling of packet transmissions [RFC 3448, 4.6] |
91cf5a17 GR |
368 | * |
369 | * if (t_now > t_nom - delta) | |
370 | * // send the packet now | |
371 | * else | |
372 | * // send the packet in (t_nom - t_now) milliseconds. | |
373 | */ | |
0f9e5b57 | 374 | if (delay - (suseconds_t)hctx->ccid3hctx_delta >= 0) |
7da7f456 | 375 | return delay / 1000L; |
9f8681db GR |
376 | |
377 | ccid3_hc_tx_update_win_count(hctx, &now); | |
7c657876 | 378 | break; |
59348b19 | 379 | case TFRC_SSTATE_TERM: |
a9672411 | 380 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
7da7f456 | 381 | return -EINVAL; |
7c657876 ACM |
382 | } |
383 | ||
7da7f456 GR |
384 | /* prepare to send now (add options etc.) */ |
385 | dp->dccps_hc_tx_insert_options = 1; | |
e312d100 | 386 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; |
0c150efb | 387 | hctx->ccid3hctx_idle = 0; |
e312d100 GR |
388 | |
389 | /* set the nominal send time for the next following packet */ | |
7da7f456 GR |
390 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
391 | ||
392 | return 0; | |
7c657876 ACM |
393 | } |
394 | ||
8109b02b ACM |
395 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, |
396 | unsigned int len) | |
7c657876 | 397 | { |
59725dc2 | 398 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 399 | struct timeval now; |
6b57c93d | 400 | struct dccp_tx_hist_entry *packet; |
7c657876 | 401 | |
59348b19 | 402 | BUG_ON(hctx == NULL); |
7c657876 | 403 | |
6b57c93d | 404 | ccid3_hc_tx_update_s(hctx, len); |
7c657876 | 405 | |
c5a1ae9a | 406 | packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC); |
6b57c93d | 407 | if (unlikely(packet == NULL)) { |
c5a1ae9a | 408 | DCCP_CRIT("packet history - out of memory!"); |
6b57c93d GR |
409 | return; |
410 | } | |
c5a1ae9a GR |
411 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, packet); |
412 | ||
413 | dccp_timestamp(sk, &now); | |
6b57c93d | 414 | packet->dccphtx_tstamp = now; |
c5a1ae9a GR |
415 | packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss; |
416 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; | |
417 | packet->dccphtx_sent = 1; | |
7c657876 ACM |
418 | } |
419 | ||
420 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) | |
421 | { | |
59725dc2 ACM |
422 | const struct dccp_sock *dp = dccp_sk(sk); |
423 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 | 424 | struct ccid3_options_received *opt_recv; |
8c60f3fa | 425 | struct dccp_tx_hist_entry *packet; |
b0e56780 | 426 | struct timeval now; |
2a1fda6f | 427 | unsigned long t_nfb; |
7dfee1a9 | 428 | u32 pinv, r_sample; |
1f2333ae | 429 | |
59348b19 | 430 | BUG_ON(hctx == NULL); |
7c657876 ACM |
431 | |
432 | /* we are only interested in ACKs */ | |
433 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || | |
434 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) | |
435 | return; | |
436 | ||
437 | opt_recv = &hctx->ccid3hctx_options_received; | |
438 | ||
7c657876 | 439 | switch (hctx->ccid3hctx_state) { |
7c657876 ACM |
440 | case TFRC_SSTATE_NO_FBACK: |
441 | case TFRC_SSTATE_FBACK: | |
5c3fbb6a | 442 | /* get packet from history to look up t_recvdata */ |
8c60f3fa | 443 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
8109b02b | 444 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
59d203f9 | 445 | if (unlikely(packet == NULL)) { |
5c3fbb6a | 446 | DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " |
59348b19 | 447 | "in history!\n", dccp_role(sk), sk, |
59d203f9 | 448 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
8109b02b | 449 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
7c657876 ACM |
450 | return; |
451 | } | |
452 | ||
1a21e49a | 453 | /* Update receive rate in units of 64 * bytes/second */ |
9e8efc82 GR |
454 | hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; |
455 | hctx->ccid3hctx_x_recv <<= 6; | |
5c3fbb6a GR |
456 | |
457 | /* Update loss event rate */ | |
458 | pinv = opt_recv->ccid3or_loss_event_rate; | |
45393a66 | 459 | if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ |
5c3fbb6a | 460 | hctx->ccid3hctx_p = 0; |
45393a66 | 461 | else /* can not exceed 100% */ |
8109b02b | 462 | hctx->ccid3hctx_p = 1000000 / pinv; |
5c3fbb6a | 463 | |
b0e56780 | 464 | dccp_timestamp(sk, &now); |
5c3fbb6a GR |
465 | |
466 | /* | |
467 | * Calculate new round trip sample as per [RFC 3448, 4.3] by | |
8109b02b | 468 | * R_sample = (now - t_recvdata) - t_elapsed |
5c3fbb6a | 469 | */ |
7dfee1a9 | 470 | r_sample = dccp_sample_rtt(sk, &now, &packet->dccphtx_tstamp); |
5c3fbb6a | 471 | |
7dfee1a9 GR |
472 | /* |
473 | * Update RTT estimate by | |
7c657876 ACM |
474 | * If (No feedback recv) |
475 | * R = R_sample; | |
476 | * Else | |
477 | * R = q * R + (1 - q) * R_sample; | |
478 | * | |
479 | * q is a constant, RFC 3448 recomments 0.9 | |
480 | */ | |
481 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { | |
1a21e49a GR |
482 | /* |
483 | * Larger Initial Windows [RFC 4342, sec. 5] | |
1a21e49a | 484 | */ |
a79ef76f | 485 | hctx->ccid3hctx_rtt = r_sample; |
a21f9f96 | 486 | hctx->ccid3hctx_x = rfc3390_initial_rate(sk); |
a79ef76f GR |
487 | hctx->ccid3hctx_t_ld = now; |
488 | ||
1266adee | 489 | ccid3_update_send_interval(hctx); |
7c657876 | 490 | |
a21f9f96 | 491 | ccid3_pr_debug("%s(%p), s=%u, MSS=%u, " |
7dfee1a9 | 492 | "R_sample=%uus, X=%u\n", dccp_role(sk), |
0f08461e | 493 | sk, hctx->ccid3hctx_s, |
7dfee1a9 | 494 | dp->dccps_mss_cache, r_sample, |
1a21e49a | 495 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
7c657876 | 496 | |
5c3fbb6a GR |
497 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); |
498 | } else { | |
499 | hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + | |
7dfee1a9 | 500 | r_sample) / 10; |
7c657876 | 501 | |
ff586298 GR |
502 | /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ |
503 | if (hctx->ccid3hctx_p > 0) | |
504 | hctx->ccid3hctx_x_calc = | |
505 | tfrc_calc_x(hctx->ccid3hctx_s, | |
506 | hctx->ccid3hctx_rtt, | |
507 | hctx->ccid3hctx_p); | |
5c3fbb6a | 508 | ccid3_hc_tx_update_x(sk, &now); |
7c657876 | 509 | |
7dfee1a9 | 510 | ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, " |
8109b02b ACM |
511 | "p=%u, X_calc=%u, X_recv=%u, X=%u\n", |
512 | dccp_role(sk), | |
7dfee1a9 | 513 | sk, hctx->ccid3hctx_rtt, r_sample, |
5c3fbb6a GR |
514 | hctx->ccid3hctx_s, hctx->ccid3hctx_p, |
515 | hctx->ccid3hctx_x_calc, | |
9e8efc82 | 516 | (unsigned)(hctx->ccid3hctx_x_recv >> 6), |
8109b02b | 517 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
7c657876 ACM |
518 | } |
519 | ||
520 | /* unschedule no feedback timer */ | |
521 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
522 | ||
7c657876 | 523 | /* remove all packets older than the one acked from history */ |
8c60f3fa ACM |
524 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
525 | &hctx->ccid3hctx_hist, packet); | |
c530cfb1 | 526 | /* |
8109b02b ACM |
527 | * As we have calculated new ipi, delta, t_nom it is possible |
528 | * that we now can send a packet, so wake up dccp_wait_for_ccid | |
c530cfb1 ACM |
529 | */ |
530 | sk->sk_write_space(sk); | |
8c60f3fa | 531 | |
8a508ac2 GR |
532 | /* |
533 | * Update timeout interval for the nofeedback timer. | |
534 | * We use a configuration option to increase the lower bound. | |
8109b02b ACM |
535 | * This can help avoid triggering the nofeedback timer too |
536 | * often ('spinning') on LANs with small RTTs. | |
8a508ac2 | 537 | */ |
5d0dbc4a | 538 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
8a508ac2 | 539 | CONFIG_IP_DCCP_CCID3_RTO * |
8109b02b | 540 | (USEC_PER_SEC/1000)); |
1f2333ae ACM |
541 | /* |
542 | * Schedule no feedback timer to expire in | |
8a508ac2 | 543 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
1f2333ae | 544 | */ |
8a508ac2 | 545 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
7c657876 | 546 | |
a9672411 | 547 | ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " |
8109b02b ACM |
548 | "expire in %lu jiffies (%luus)\n", |
549 | dccp_role(sk), | |
a9672411 GR |
550 | sk, usecs_to_jiffies(t_nfb), t_nfb); |
551 | ||
552 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, | |
2a1fda6f | 553 | jiffies + usecs_to_jiffies(t_nfb)); |
7c657876 ACM |
554 | |
555 | /* set idle flag */ | |
bf58a381 | 556 | hctx->ccid3hctx_idle = 1; |
7c657876 | 557 | break; |
151a9931 | 558 | case TFRC_SSTATE_NO_SENT: /* fall through */ |
5e19e3fc | 559 | case TFRC_SSTATE_TERM: /* ignore feedback when closing */ |
7c657876 ACM |
560 | break; |
561 | } | |
562 | } | |
563 | ||
7c657876 | 564 | static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, |
1f2333ae ACM |
565 | unsigned char len, u16 idx, |
566 | unsigned char *value) | |
7c657876 ACM |
567 | { |
568 | int rc = 0; | |
59725dc2 ACM |
569 | const struct dccp_sock *dp = dccp_sk(sk); |
570 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
7c657876 ACM |
571 | struct ccid3_options_received *opt_recv; |
572 | ||
59d203f9 | 573 | BUG_ON(hctx == NULL); |
7c657876 ACM |
574 | |
575 | opt_recv = &hctx->ccid3hctx_options_received; | |
576 | ||
577 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { | |
578 | opt_recv->ccid3or_seqno = dp->dccps_gsr; | |
579 | opt_recv->ccid3or_loss_event_rate = ~0; | |
580 | opt_recv->ccid3or_loss_intervals_idx = 0; | |
581 | opt_recv->ccid3or_loss_intervals_len = 0; | |
582 | opt_recv->ccid3or_receive_rate = 0; | |
583 | } | |
584 | ||
585 | switch (option) { | |
586 | case TFRC_OPT_LOSS_EVENT_RATE: | |
59d203f9 | 587 | if (unlikely(len != 4)) { |
a9672411 | 588 | DCCP_WARN("%s(%p), invalid len %d " |
59348b19 GR |
589 | "for TFRC_OPT_LOSS_EVENT_RATE\n", |
590 | dccp_role(sk), sk, len); | |
7c657876 ACM |
591 | rc = -EINVAL; |
592 | } else { | |
8109b02b ACM |
593 | opt_recv->ccid3or_loss_event_rate = |
594 | ntohl(*(__be32 *)value); | |
a9672411 | 595 | ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", |
7c657876 ACM |
596 | dccp_role(sk), sk, |
597 | opt_recv->ccid3or_loss_event_rate); | |
598 | } | |
599 | break; | |
600 | case TFRC_OPT_LOSS_INTERVALS: | |
601 | opt_recv->ccid3or_loss_intervals_idx = idx; | |
602 | opt_recv->ccid3or_loss_intervals_len = len; | |
a9672411 | 603 | ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n", |
7c657876 ACM |
604 | dccp_role(sk), sk, |
605 | opt_recv->ccid3or_loss_intervals_idx, | |
606 | opt_recv->ccid3or_loss_intervals_len); | |
607 | break; | |
608 | case TFRC_OPT_RECEIVE_RATE: | |
59d203f9 | 609 | if (unlikely(len != 4)) { |
a9672411 | 610 | DCCP_WARN("%s(%p), invalid len %d " |
59348b19 GR |
611 | "for TFRC_OPT_RECEIVE_RATE\n", |
612 | dccp_role(sk), sk, len); | |
7c657876 ACM |
613 | rc = -EINVAL; |
614 | } else { | |
8109b02b ACM |
615 | opt_recv->ccid3or_receive_rate = |
616 | ntohl(*(__be32 *)value); | |
a9672411 | 617 | ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", |
7c657876 ACM |
618 | dccp_role(sk), sk, |
619 | opt_recv->ccid3or_receive_rate); | |
620 | } | |
621 | break; | |
622 | } | |
623 | ||
624 | return rc; | |
625 | } | |
626 | ||
91f0ebf7 | 627 | static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) |
7c657876 | 628 | { |
91f0ebf7 | 629 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
7c657876 | 630 | |
78ad713d | 631 | hctx->ccid3hctx_s = 0; |
fe0499ae | 632 | hctx->ccid3hctx_rtt = 0; |
7c657876 ACM |
633 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
634 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); | |
aa5d7df3 | 635 | |
8109b02b ACM |
636 | hctx->ccid3hctx_no_feedback_timer.function = |
637 | ccid3_hc_tx_no_feedback_timer; | |
aa5d7df3 | 638 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; |
7c657876 ACM |
639 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
644 | static void ccid3_hc_tx_exit(struct sock *sk) | |
645 | { | |
59725dc2 | 646 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
7c657876 | 647 | |
7c657876 ACM |
648 | BUG_ON(hctx == NULL); |
649 | ||
650 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); | |
651 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); | |
652 | ||
653 | /* Empty packet history */ | |
8c60f3fa | 654 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
7c657876 ACM |
655 | } |
656 | ||
9bf17475 GR |
657 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) |
658 | { | |
659 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
660 | ||
661 | /* Listen socks doesn't have a private CCID block */ | |
662 | if (sk->sk_state == DCCP_LISTEN) | |
663 | return; | |
664 | ||
665 | BUG_ON(hctx == NULL); | |
666 | ||
667 | info->tcpi_rto = hctx->ccid3hctx_t_rto; | |
668 | info->tcpi_rtt = hctx->ccid3hctx_rtt; | |
669 | } | |
670 | ||
671 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, | |
672 | u32 __user *optval, int __user *optlen) | |
673 | { | |
674 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); | |
675 | const void *val; | |
676 | ||
677 | /* Listen socks doesn't have a private CCID block */ | |
678 | if (sk->sk_state == DCCP_LISTEN) | |
679 | return -EINVAL; | |
680 | ||
681 | switch (optname) { | |
682 | case DCCP_SOCKOPT_CCID_TX_INFO: | |
683 | if (len < sizeof(hctx->ccid3hctx_tfrc)) | |
684 | return -EINVAL; | |
685 | len = sizeof(hctx->ccid3hctx_tfrc); | |
686 | val = &hctx->ccid3hctx_tfrc; | |
687 | break; | |
688 | default: | |
689 | return -ENOPROTOOPT; | |
690 | } | |
691 | ||
692 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
693 | return -EFAULT; | |
694 | ||
695 | return 0; | |
696 | } | |
697 | ||
7c657876 | 698 | /* |
9bf17475 | 699 | * Receiver Half-Connection Routines |
7c657876 | 700 | */ |
56724aa4 | 701 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
702 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
703 | { | |
704 | static char *ccid3_rx_state_names[] = { | |
705 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", | |
706 | [TFRC_RSTATE_DATA] = "DATA", | |
707 | [TFRC_RSTATE_TERM] = "TERM", | |
708 | }; | |
709 | ||
710 | return ccid3_rx_state_names[state]; | |
711 | } | |
712 | #endif | |
713 | ||
c25a18ba ACM |
714 | static void ccid3_hc_rx_set_state(struct sock *sk, |
715 | enum ccid3_hc_rx_states state) | |
7c657876 | 716 | { |
59725dc2 | 717 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 ACM |
718 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
719 | ||
720 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", | |
1f2333ae ACM |
721 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
722 | ccid3_rx_state_name(state)); | |
7c657876 ACM |
723 | WARN_ON(state == oldstate); |
724 | hcrx->ccid3hcrx_state = state; | |
725 | } | |
726 | ||
78ad713d GR |
727 | static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) |
728 | { | |
729 | if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ | |
730 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); | |
731 | else | |
732 | hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : | |
733 | (9 * hcrx->ccid3hcrx_s + len) / 10; | |
734 | } | |
735 | ||
7c657876 ACM |
736 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
737 | { | |
59725dc2 | 738 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 739 | struct dccp_sock *dp = dccp_sk(sk); |
8c60f3fa | 740 | struct dccp_rx_hist_entry *packet; |
b6ee3d4a | 741 | struct timeval now; |
0f9e5b57 | 742 | suseconds_t delta; |
7c657876 | 743 | |
a9672411 | 744 | ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk), sk); |
7c657876 | 745 | |
b0e56780 | 746 | dccp_timestamp(sk, &now); |
b6ee3d4a | 747 | |
7c657876 ACM |
748 | switch (hcrx->ccid3hcrx_state) { |
749 | case TFRC_RSTATE_NO_DATA: | |
750 | hcrx->ccid3hcrx_x_recv = 0; | |
751 | break; | |
0f9e5b57 GR |
752 | case TFRC_RSTATE_DATA: |
753 | delta = timeval_delta(&now, | |
754 | &hcrx->ccid3hcrx_tstamp_last_feedback); | |
755 | DCCP_BUG_ON(delta < 0); | |
b9039a2a GR |
756 | hcrx->ccid3hcrx_x_recv = |
757 | scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); | |
7c657876 | 758 | break; |
59348b19 | 759 | case TFRC_RSTATE_TERM: |
a9672411 | 760 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
7c657876 ACM |
761 | return; |
762 | } | |
763 | ||
8c60f3fa | 764 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
59d203f9 | 765 | if (unlikely(packet == NULL)) { |
a9672411 | 766 | DCCP_WARN("%s(%p), no data packet in history!\n", |
59348b19 | 767 | dccp_role(sk), sk); |
7c657876 ACM |
768 | return; |
769 | } | |
770 | ||
b6ee3d4a | 771 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
66a377c5 | 772 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
7c657876 ACM |
773 | hcrx->ccid3hcrx_bytes_recv = 0; |
774 | ||
0f9e5b57 GR |
775 | /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */ |
776 | delta = timeval_delta(&now, &packet->dccphrx_tstamp); | |
777 | DCCP_BUG_ON(delta < 0); | |
778 | hcrx->ccid3hcrx_elapsed_time = delta / 10; | |
45393a66 | 779 | |
7c657876 | 780 | if (hcrx->ccid3hcrx_p == 0) |
45393a66 GR |
781 | hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ |
782 | else if (hcrx->ccid3hcrx_p > 1000000) { | |
783 | DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); | |
784 | hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ | |
785 | } else | |
7c657876 | 786 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; |
45393a66 | 787 | |
507d37cf | 788 | dp->dccps_hc_rx_insert_options = 1; |
7c657876 ACM |
789 | dccp_send_ack(sk); |
790 | } | |
791 | ||
2d0817d1 | 792 | static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 | 793 | { |
59d203f9 | 794 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
60fe62e7 | 795 | __be32 x_recv, pinv; |
7c657876 | 796 | |
59d203f9 ACM |
797 | BUG_ON(hcrx == NULL); |
798 | ||
799 | if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) | |
2d0817d1 | 800 | return 0; |
7c657876 | 801 | |
66a377c5 | 802 | DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; |
4fded33b ACM |
803 | |
804 | if (dccp_packet_without_ack(skb)) | |
2d0817d1 ACM |
805 | return 0; |
806 | ||
4fded33b ACM |
807 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
808 | pinv = htonl(hcrx->ccid3hcrx_pinv); | |
2d0817d1 ACM |
809 | |
810 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && | |
811 | dccp_insert_option_elapsed_time(sk, skb, | |
812 | hcrx->ccid3hcrx_elapsed_time)) || | |
813 | dccp_insert_option_timestamp(sk, skb) || | |
814 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, | |
8109b02b | 815 | &pinv, sizeof(pinv)) || |
2d0817d1 | 816 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, |
8109b02b | 817 | &x_recv, sizeof(x_recv))) |
2d0817d1 ACM |
818 | return -1; |
819 | ||
820 | return 0; | |
7c657876 ACM |
821 | } |
822 | ||
7c657876 ACM |
823 | /* calculate first loss interval |
824 | * | |
825 | * returns estimated loss interval in usecs */ | |
826 | ||
827 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) | |
828 | { | |
59725dc2 | 829 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
8c60f3fa | 830 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
0f9e5b57 GR |
831 | u32 x_recv, p; |
832 | suseconds_t rtt, delta; | |
b6ee3d4a | 833 | struct timeval tstamp = { 0, }; |
7c657876 ACM |
834 | int interval = 0; |
835 | int win_count = 0; | |
836 | int step = 0; | |
bfe24a6c | 837 | u64 fval; |
7c657876 | 838 | |
8c60f3fa ACM |
839 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
840 | dccphrx_node) { | |
841 | if (dccp_rx_hist_entry_data_packet(entry)) { | |
7c657876 ACM |
842 | tail = entry; |
843 | ||
844 | switch (step) { | |
845 | case 0: | |
8c60f3fa | 846 | tstamp = entry->dccphrx_tstamp; |
c1734376 | 847 | win_count = entry->dccphrx_ccval; |
7c657876 ACM |
848 | step = 1; |
849 | break; | |
850 | case 1: | |
c1734376 | 851 | interval = win_count - entry->dccphrx_ccval; |
7c657876 ACM |
852 | if (interval < 0) |
853 | interval += TFRC_WIN_COUNT_LIMIT; | |
854 | if (interval > 4) | |
855 | goto found; | |
856 | break; | |
857 | } | |
858 | } | |
859 | } | |
860 | ||
59d203f9 | 861 | if (unlikely(step == 0)) { |
a9672411 | 862 | DCCP_WARN("%s(%p), packet history has no data packets!\n", |
59348b19 | 863 | dccp_role(sk), sk); |
7c657876 ACM |
864 | return ~0; |
865 | } | |
866 | ||
59d203f9 | 867 | if (unlikely(interval == 0)) { |
a9672411 | 868 | DCCP_WARN("%s(%p), Could not find a win_count interval > 0." |
59348b19 | 869 | "Defaulting to 1\n", dccp_role(sk), sk); |
7c657876 ACM |
870 | interval = 1; |
871 | } | |
872 | found: | |
66a377c5 | 873 | if (!tail) { |
59348b19 | 874 | DCCP_CRIT("tail is null\n"); |
66a377c5 IM |
875 | return ~0; |
876 | } | |
0f9e5b57 GR |
877 | |
878 | delta = timeval_delta(&tstamp, &tail->dccphrx_tstamp); | |
879 | DCCP_BUG_ON(delta < 0); | |
880 | ||
881 | rtt = delta * 4 / interval; | |
1fba78b6 ACM |
882 | ccid3_pr_debug("%s(%p), approximated RTT to %dus\n", |
883 | dccp_role(sk), sk, (int)rtt); | |
59348b19 | 884 | |
bfe24a6c GR |
885 | /* |
886 | * Determine the length of the first loss interval via inverse lookup. | |
887 | * Assume that X_recv can be computed by the throughput equation | |
8109b02b ACM |
888 | * s |
889 | * X_recv = -------- | |
890 | * R * fval | |
bfe24a6c GR |
891 | * Find some p such that f(p) = fval; return 1/p [RFC 3448, 6.3.1]. |
892 | */ | |
893 | if (rtt == 0) { /* would result in divide-by-zero */ | |
832e3ca6 IM |
894 | DCCP_WARN("RTT==0\n"); |
895 | return ~0; | |
59348b19 | 896 | } |
7c657876 | 897 | |
b0e56780 ACM |
898 | dccp_timestamp(sk, &tstamp); |
899 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); | |
0f9e5b57 | 900 | DCCP_BUG_ON(delta <= 0); |
7c657876 | 901 | |
0f9e5b57 | 902 | x_recv = scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); |
bfe24a6c GR |
903 | if (x_recv == 0) { /* would also trigger divide-by-zero */ |
904 | DCCP_WARN("X_recv==0\n"); | |
905 | if ((x_recv = hcrx->ccid3hcrx_x_recv) == 0) { | |
906 | DCCP_BUG("stored value of X_recv is zero"); | |
832e3ca6 | 907 | return ~0; |
bfe24a6c | 908 | } |
66a377c5 IM |
909 | } |
910 | ||
bfe24a6c GR |
911 | fval = scaled_div(hcrx->ccid3hcrx_s, rtt); |
912 | fval = scaled_div32(fval, x_recv); | |
36729c1a | 913 | p = tfrc_calc_x_reverse_lookup(fval); |
bfe24a6c | 914 | |
a9672411 | 915 | ccid3_pr_debug("%s(%p), receive rate=%u bytes/s, implied " |
1f2333ae | 916 | "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); |
7c657876 ACM |
917 | |
918 | if (p == 0) | |
919 | return ~0; | |
920 | else | |
8109b02b | 921 | return 1000000 / p; |
7c657876 ACM |
922 | } |
923 | ||
924 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) | |
925 | { | |
59725dc2 | 926 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
fc747e82 | 927 | struct dccp_li_hist_entry *head; |
66a377c5 | 928 | u64 seq_temp; |
7c657876 | 929 | |
66a377c5 IM |
930 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
931 | if (!dccp_li_hist_interval_new(ccid3_li_hist, | |
932 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) | |
933 | return; | |
7c657876 | 934 | |
fc747e82 IM |
935 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
936 | struct dccp_li_hist_entry, dccplih_node); | |
937 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); | |
66a377c5 IM |
938 | } else { |
939 | struct dccp_li_hist_entry *entry; | |
940 | struct list_head *tail; | |
941 | ||
fc747e82 IM |
942 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
943 | struct dccp_li_hist_entry, dccplih_node); | |
66a377c5 IM |
944 | /* FIXME win count check removed as was wrong */ |
945 | /* should make this check with receive history */ | |
946 | /* and compare there as per section 10.2 of RFC4342 */ | |
947 | ||
948 | /* new loss event detected */ | |
949 | /* calculate last interval length */ | |
950 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); | |
54e6ecb2 | 951 | entry = dccp_li_hist_entry_new(ccid3_li_hist, GFP_ATOMIC); |
66a377c5 IM |
952 | |
953 | if (entry == NULL) { | |
59348b19 | 954 | DCCP_BUG("out of memory - can not allocate entry"); |
ae6706f0 | 955 | return; |
66a377c5 IM |
956 | } |
957 | ||
958 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); | |
959 | ||
960 | tail = hcrx->ccid3hcrx_li_hist.prev; | |
961 | list_del(tail); | |
962 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); | |
963 | ||
964 | /* Create the newest interval */ | |
965 | entry->dccplih_seqno = seq_loss; | |
966 | entry->dccplih_interval = seq_temp; | |
967 | entry->dccplih_win_count = win_loss; | |
968 | } | |
7c657876 ACM |
969 | } |
970 | ||
66a377c5 | 971 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
c9eaf173 | 972 | struct dccp_rx_hist_entry *packet) |
7c657876 | 973 | { |
59725dc2 | 974 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
8109b02b ACM |
975 | struct dccp_rx_hist_entry *rx_hist = |
976 | dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); | |
66a377c5 IM |
977 | u64 seqno = packet->dccphrx_seqno; |
978 | u64 tmp_seqno; | |
979 | int loss = 0; | |
980 | u8 ccval; | |
981 | ||
982 | ||
983 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
984 | ||
985 | if (!rx_hist || | |
986 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
987 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
988 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
989 | goto detect_out; | |
990 | } | |
991 | ||
7c657876 | 992 | |
66a377c5 IM |
993 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
994 | > TFRC_RECV_NUM_LATE_LOSS) { | |
995 | loss = 1; | |
996 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, | |
997 | hcrx->ccid3hcrx_ccval_nonloss); | |
998 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; | |
999 | dccp_inc_seqno(&tmp_seqno); | |
1000 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; | |
1001 | dccp_inc_seqno(&tmp_seqno); | |
1002 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, | |
1003 | tmp_seqno, &ccval)) { | |
8109b02b | 1004 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
66a377c5 IM |
1005 | hcrx->ccid3hcrx_ccval_nonloss = ccval; |
1006 | dccp_inc_seqno(&tmp_seqno); | |
1007 | } | |
1008 | } | |
1009 | ||
1010 | /* FIXME - this code could be simplified with above while */ | |
1011 | /* but works at moment */ | |
1012 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { | |
1013 | hcrx->ccid3hcrx_seqno_nonloss = seqno; | |
1014 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; | |
1015 | } | |
1016 | ||
1017 | detect_out: | |
1018 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, | |
1019 | &hcrx->ccid3hcrx_li_hist, packet, | |
1020 | hcrx->ccid3hcrx_seqno_nonloss); | |
1021 | return loss; | |
7c657876 ACM |
1022 | } |
1023 | ||
7c657876 ACM |
1024 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
1025 | { | |
59725dc2 | 1026 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
4fded33b | 1027 | const struct dccp_options_received *opt_recv; |
8c60f3fa | 1028 | struct dccp_rx_hist_entry *packet; |
7c657876 | 1029 | struct timeval now; |
7dfee1a9 | 1030 | u32 p_prev, r_sample, rtt_prev; |
78ad713d | 1031 | int loss, payload_size; |
1f2333ae | 1032 | |
59348b19 | 1033 | BUG_ON(hcrx == NULL); |
7c657876 | 1034 | |
59725dc2 | 1035 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
4fded33b | 1036 | |
7c657876 ACM |
1037 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
1038 | case DCCP_PKT_ACK: | |
1039 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
1040 | return; | |
1041 | case DCCP_PKT_DATAACK: | |
4fded33b | 1042 | if (opt_recv->dccpor_timestamp_echo == 0) |
7c657876 | 1043 | break; |
66a377c5 | 1044 | rtt_prev = hcrx->ccid3hcrx_rtt; |
b0e56780 | 1045 | dccp_timestamp(sk, &now); |
7dfee1a9 | 1046 | r_sample = dccp_sample_rtt(sk, &now, NULL); |
b3a3077d ACM |
1047 | |
1048 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) | |
1049 | hcrx->ccid3hcrx_rtt = r_sample; | |
1050 | else | |
1051 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + | |
1052 | r_sample / 10; | |
1053 | ||
66a377c5 | 1054 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
a9672411 GR |
1055 | ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n", |
1056 | dccp_role(sk), sk, hcrx->ccid3hcrx_rtt, | |
4fded33b | 1057 | opt_recv->dccpor_elapsed_time); |
7c657876 ACM |
1058 | break; |
1059 | case DCCP_PKT_DATA: | |
1060 | break; | |
59d203f9 | 1061 | default: /* We're not interested in other packet types, move along */ |
7c657876 ACM |
1062 | return; |
1063 | } | |
1064 | ||
b0e56780 | 1065 | packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, |
54e6ecb2 | 1066 | skb, GFP_ATOMIC); |
59d203f9 | 1067 | if (unlikely(packet == NULL)) { |
a9672411 | 1068 | DCCP_WARN("%s(%p), Not enough mem to add rx packet " |
59348b19 | 1069 | "to history, consider it lost!\n", dccp_role(sk), sk); |
7c657876 ACM |
1070 | return; |
1071 | } | |
1072 | ||
66a377c5 | 1073 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
7c657876 ACM |
1074 | |
1075 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) | |
1076 | return; | |
1077 | ||
78ad713d GR |
1078 | payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; |
1079 | ccid3_hc_rx_update_s(hcrx, payload_size); | |
1080 | ||
7c657876 ACM |
1081 | switch (hcrx->ccid3hcrx_state) { |
1082 | case TFRC_RSTATE_NO_DATA: | |
a9672411 GR |
1083 | ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial " |
1084 | "feedback\n", dccp_role(sk), sk, | |
1f2333ae | 1085 | dccp_state_name(sk->sk_state), skb); |
7c657876 ACM |
1086 | ccid3_hc_rx_send_feedback(sk); |
1087 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); | |
1088 | return; | |
1089 | case TFRC_RSTATE_DATA: | |
78ad713d | 1090 | hcrx->ccid3hcrx_bytes_recv += payload_size; |
66a377c5 | 1091 | if (loss) |
b6ee3d4a ACM |
1092 | break; |
1093 | ||
b0e56780 | 1094 | dccp_timestamp(sk, &now); |
8109b02b ACM |
1095 | if ((timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) - |
1096 | (suseconds_t)hcrx->ccid3hcrx_rtt) >= 0) { | |
b6ee3d4a ACM |
1097 | hcrx->ccid3hcrx_tstamp_last_ack = now; |
1098 | ccid3_hc_rx_send_feedback(sk); | |
7c657876 | 1099 | } |
b6ee3d4a | 1100 | return; |
59348b19 | 1101 | case TFRC_RSTATE_TERM: |
a9672411 | 1102 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
7c657876 ACM |
1103 | return; |
1104 | } | |
1105 | ||
1106 | /* Dealing with packet loss */ | |
a9672411 | 1107 | ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n", |
4fded33b | 1108 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); |
7c657876 | 1109 | |
7c657876 | 1110 | p_prev = hcrx->ccid3hcrx_p; |
c9eaf173 | 1111 | |
7c657876 | 1112 | /* Calculate loss event rate */ |
c0996660 IM |
1113 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
1114 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); | |
1115 | ||
7c657876 | 1116 | /* Scaling up by 1000000 as fixed decimal */ |
c0996660 IM |
1117 | if (i_mean != 0) |
1118 | hcrx->ccid3hcrx_p = 1000000 / i_mean; | |
59348b19 GR |
1119 | } else |
1120 | DCCP_BUG("empty loss history"); | |
7c657876 ACM |
1121 | |
1122 | if (hcrx->ccid3hcrx_p > p_prev) { | |
1123 | ccid3_hc_rx_send_feedback(sk); | |
1124 | return; | |
1125 | } | |
1126 | } | |
1127 | ||
91f0ebf7 | 1128 | static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) |
7c657876 | 1129 | { |
91f0ebf7 | 1130 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
7c657876 | 1131 | |
a9672411 | 1132 | ccid3_pr_debug("entry\n"); |
7c657876 | 1133 | |
7c657876 ACM |
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 | 1138 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
78ad713d | 1139 | hcrx->ccid3hcrx_s = 0; |
fe0499ae | 1140 | hcrx->ccid3hcrx_rtt = 0; |
7c657876 ACM |
1141 | return 0; |
1142 | } | |
1143 | ||
1144 | static void ccid3_hc_rx_exit(struct sock *sk) | |
1145 | { | |
59725dc2 | 1146 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
7c657876 | 1147 | |
59d203f9 | 1148 | BUG_ON(hcrx == NULL); |
7c657876 ACM |
1149 | |
1150 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); | |
1151 | ||
1152 | /* Empty packet history */ | |
8c60f3fa | 1153 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
7c657876 ACM |
1154 | |
1155 | /* Empty loss interval history */ | |
ae6706f0 | 1156 | dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); |
7c657876 ACM |
1157 | } |
1158 | ||
2babe1f6 ACM |
1159 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
1160 | { | |
59725dc2 | 1161 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
2babe1f6 | 1162 | |
59c2353d ACM |
1163 | /* Listen socks doesn't have a private CCID block */ |
1164 | if (sk->sk_state == DCCP_LISTEN) | |
1165 | return; | |
1166 | ||
59d203f9 | 1167 | BUG_ON(hcrx == NULL); |
2babe1f6 | 1168 | |
8109b02b ACM |
1169 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; |
1170 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; | |
1171 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; | |
2babe1f6 ACM |
1172 | } |
1173 | ||
88f964db ACM |
1174 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
1175 | u32 __user *optval, int __user *optlen) | |
1176 | { | |
1177 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); | |
1178 | const void *val; | |
c9eaf173 | 1179 | |
88f964db ACM |
1180 | /* Listen socks doesn't have a private CCID block */ |
1181 | if (sk->sk_state == DCCP_LISTEN) | |
1182 | return -EINVAL; | |
1183 | ||
1184 | switch (optname) { | |
1185 | case DCCP_SOCKOPT_CCID_RX_INFO: | |
1186 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) | |
1187 | return -EINVAL; | |
1188 | len = sizeof(hcrx->ccid3hcrx_tfrc); | |
1189 | val = &hcrx->ccid3hcrx_tfrc; | |
1190 | break; | |
1191 | default: | |
1192 | return -ENOPROTOOPT; | |
1193 | } | |
1194 | ||
1195 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) | |
1196 | return -EFAULT; | |
1197 | ||
1198 | return 0; | |
1199 | } | |
1200 | ||
91f0ebf7 | 1201 | static struct ccid_operations ccid3 = { |
3dd9a7c3 | 1202 | .ccid_id = DCCPC_CCID3, |
7c657876 ACM |
1203 | .ccid_name = "ccid3", |
1204 | .ccid_owner = THIS_MODULE, | |
91f0ebf7 | 1205 | .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), |
7c657876 ACM |
1206 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
1207 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, | |
1208 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, | |
1209 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, | |
1210 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, | |
7c657876 | 1211 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, |
91f0ebf7 | 1212 | .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), |
7c657876 ACM |
1213 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
1214 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, | |
1215 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, | |
1216 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, | |
2babe1f6 ACM |
1217 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
1218 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, | |
88f964db ACM |
1219 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
1220 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, | |
7c657876 | 1221 | }; |
8109b02b | 1222 | |
56724aa4 | 1223 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
7c657876 ACM |
1224 | module_param(ccid3_debug, int, 0444); |
1225 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); | |
56724aa4 | 1226 | #endif |
7c657876 ACM |
1227 | |
1228 | static __init int ccid3_module_init(void) | |
1229 | { | |
8c60f3fa | 1230 | int rc = -ENOBUFS; |
7c657876 | 1231 | |
8c60f3fa ACM |
1232 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
1233 | if (ccid3_rx_hist == NULL) | |
7c657876 ACM |
1234 | goto out; |
1235 | ||
8c60f3fa ACM |
1236 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
1237 | if (ccid3_tx_hist == NULL) | |
1238 | goto out_free_rx; | |
7c657876 | 1239 | |
ae6706f0 ACM |
1240 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
1241 | if (ccid3_li_hist == NULL) | |
8c60f3fa | 1242 | goto out_free_tx; |
7c657876 ACM |
1243 | |
1244 | rc = ccid_register(&ccid3); | |
8109b02b | 1245 | if (rc != 0) |
7c657876 | 1246 | goto out_free_loss_interval_history; |
7c657876 ACM |
1247 | out: |
1248 | return rc; | |
8c60f3fa | 1249 | |
7c657876 | 1250 | out_free_loss_interval_history: |
ae6706f0 ACM |
1251 | dccp_li_hist_delete(ccid3_li_hist); |
1252 | ccid3_li_hist = NULL; | |
8c60f3fa ACM |
1253 | out_free_tx: |
1254 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1255 | ccid3_tx_hist = NULL; | |
1256 | out_free_rx: | |
1257 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1258 | ccid3_rx_hist = NULL; | |
7c657876 ACM |
1259 | goto out; |
1260 | } | |
1261 | module_init(ccid3_module_init); | |
1262 | ||
1263 | static __exit void ccid3_module_exit(void) | |
1264 | { | |
1265 | ccid_unregister(&ccid3); | |
1266 | ||
8c60f3fa ACM |
1267 | if (ccid3_tx_hist != NULL) { |
1268 | dccp_tx_hist_delete(ccid3_tx_hist); | |
1269 | ccid3_tx_hist = NULL; | |
7c657876 | 1270 | } |
8c60f3fa ACM |
1271 | if (ccid3_rx_hist != NULL) { |
1272 | dccp_rx_hist_delete(ccid3_rx_hist); | |
1273 | ccid3_rx_hist = NULL; | |
7c657876 | 1274 | } |
ae6706f0 ACM |
1275 | if (ccid3_li_hist != NULL) { |
1276 | dccp_li_hist_delete(ccid3_li_hist); | |
1277 | ccid3_li_hist = NULL; | |
7c657876 ACM |
1278 | } |
1279 | } | |
1280 | module_exit(ccid3_module_exit); | |
1281 | ||
e6bccd35 | 1282 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
1f2333ae | 1283 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
7c657876 ACM |
1284 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
1285 | MODULE_LICENSE("GPL"); | |
1286 | MODULE_ALIAS("net-dccp-ccid-3"); |