17c657876SArnaldo Carvalho de Melo /* 27c657876SArnaldo Carvalho de Melo * net/dccp/ccids/ccid3.c 37c657876SArnaldo Carvalho de Melo * 47c657876SArnaldo Carvalho de Melo * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand. 5e6bccd35SIan McDonald * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz> 67c657876SArnaldo Carvalho de Melo * 77c657876SArnaldo Carvalho de Melo * An implementation of the DCCP protocol 87c657876SArnaldo Carvalho de Melo * 97c657876SArnaldo Carvalho de Melo * This code has been developed by the University of Waikato WAND 107c657876SArnaldo Carvalho de Melo * research group. For further information please see http://www.wand.net.nz/ 117c657876SArnaldo Carvalho de Melo * 127c657876SArnaldo Carvalho de Melo * This code also uses code from Lulea University, rereleased as GPL by its 137c657876SArnaldo Carvalho de Melo * authors: 147c657876SArnaldo Carvalho de Melo * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon 157c657876SArnaldo Carvalho de Melo * 167c657876SArnaldo Carvalho de Melo * Changes to meet Linux coding standards, to make it meet latest ccid3 draft 177c657876SArnaldo Carvalho de Melo * and to make it work as a loadable module in the DCCP stack written by 187c657876SArnaldo Carvalho de Melo * Arnaldo Carvalho de Melo <acme@conectiva.com.br>. 197c657876SArnaldo Carvalho de Melo * 207c657876SArnaldo Carvalho de Melo * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> 217c657876SArnaldo Carvalho de Melo * 227c657876SArnaldo Carvalho de Melo * This program is free software; you can redistribute it and/or modify 237c657876SArnaldo Carvalho de Melo * it under the terms of the GNU General Public License as published by 247c657876SArnaldo Carvalho de Melo * the Free Software Foundation; either version 2 of the License, or 257c657876SArnaldo Carvalho de Melo * (at your option) any later version. 267c657876SArnaldo Carvalho de Melo * 277c657876SArnaldo Carvalho de Melo * This program is distributed in the hope that it will be useful, 287c657876SArnaldo Carvalho de Melo * but WITHOUT ANY WARRANTY; without even the implied warranty of 297c657876SArnaldo Carvalho de Melo * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 307c657876SArnaldo Carvalho de Melo * GNU General Public License for more details. 317c657876SArnaldo Carvalho de Melo * 327c657876SArnaldo Carvalho de Melo * You should have received a copy of the GNU General Public License 337c657876SArnaldo Carvalho de Melo * along with this program; if not, write to the Free Software 347c657876SArnaldo Carvalho de Melo * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 357c657876SArnaldo Carvalho de Melo */ 367c657876SArnaldo Carvalho de Melo 377c657876SArnaldo Carvalho de Melo #include "../ccid.h" 387c657876SArnaldo Carvalho de Melo #include "../dccp.h" 394524b259SArnaldo Carvalho de Melo #include "lib/packet_history.h" 40ae6706f0SArnaldo Carvalho de Melo #include "lib/loss_interval.h" 4136729c1aSArnaldo Carvalho de Melo #include "lib/tfrc.h" 427c657876SArnaldo Carvalho de Melo #include "ccid3.h" 437c657876SArnaldo Carvalho de Melo 4456724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 4556724aa4SGerrit Renker static int ccid3_debug; 4656724aa4SGerrit Renker #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) 477c657876SArnaldo Carvalho de Melo #else 487c657876SArnaldo Carvalho de Melo #define ccid3_pr_debug(format, a...) 497c657876SArnaldo Carvalho de Melo #endif 507c657876SArnaldo Carvalho de Melo 51a1d3a355SArnaldo Carvalho de Melo static struct dccp_tx_hist *ccid3_tx_hist; 52a1d3a355SArnaldo Carvalho de Melo static struct dccp_rx_hist *ccid3_rx_hist; 53ae6706f0SArnaldo Carvalho de Melo static struct dccp_li_hist *ccid3_li_hist; 547c657876SArnaldo Carvalho de Melo 5556724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 567c657876SArnaldo Carvalho de Melo static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) 577c657876SArnaldo Carvalho de Melo { 587c657876SArnaldo Carvalho de Melo static char *ccid3_state_names[] = { 597c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_SENT] = "NO_SENT", 607c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", 617c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_FBACK] = "FBACK", 627c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_TERM] = "TERM", 637c657876SArnaldo Carvalho de Melo }; 647c657876SArnaldo Carvalho de Melo 657c657876SArnaldo Carvalho de Melo return ccid3_state_names[state]; 667c657876SArnaldo Carvalho de Melo } 677c657876SArnaldo Carvalho de Melo #endif 687c657876SArnaldo Carvalho de Melo 69c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_tx_set_state(struct sock *sk, 701f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_tx_states state) 717c657876SArnaldo Carvalho de Melo { 7259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 737c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; 747c657876SArnaldo Carvalho de Melo 757c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 761f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_tx_state_name(oldstate), 771f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(state)); 787c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 797c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = state; 807c657876SArnaldo Carvalho de Melo } 817c657876SArnaldo Carvalho de Melo 8217893bc1SGerrit Renker /* 8317893bc1SGerrit Renker * Recalculate scheduled nominal send time t_nom, inter-packet interval 8417893bc1SGerrit Renker * t_ipi, and delta value. Should be called after each change to X. 8517893bc1SGerrit Renker */ 8617893bc1SGerrit Renker static inline void ccid3_update_send_time(struct ccid3_hc_tx_sock *hctx) 877c657876SArnaldo Carvalho de Melo { 8817893bc1SGerrit Renker timeval_sub_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); 8917893bc1SGerrit Renker 901a21e49aSGerrit Renker /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */ 911a21e49aSGerrit Renker hctx->ccid3hctx_t_ipi = scaled_div(hctx->ccid3hctx_s, 921a21e49aSGerrit Renker hctx->ccid3hctx_x >> 6); 9317893bc1SGerrit Renker 9417893bc1SGerrit Renker /* Update nominal send time with regard to the new t_ipi */ 9517893bc1SGerrit Renker timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); 967c657876SArnaldo Carvalho de Melo 977c657876SArnaldo Carvalho de Melo /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ 981f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, 991f2333aeSArnaldo Carvalho de Melo TFRC_OPSYS_HALF_TIME_GRAN); 1007c657876SArnaldo Carvalho de Melo } 1017c657876SArnaldo Carvalho de Melo /* 1027c657876SArnaldo Carvalho de Melo * Update X by 1037c657876SArnaldo Carvalho de Melo * If (p > 0) 1045c3fbb6aSGerrit Renker * X_calc = calcX(s, R, p); 1057c657876SArnaldo Carvalho de Melo * X = max(min(X_calc, 2 * X_recv), s / t_mbi); 1067c657876SArnaldo Carvalho de Melo * Else 1077c657876SArnaldo Carvalho de Melo * If (now - tld >= R) 1087c657876SArnaldo Carvalho de Melo * X = max(min(2 * X, 2 * X_recv), s / R); 1097c657876SArnaldo Carvalho de Melo * tld = now; 1105c3fbb6aSGerrit Renker * 1111a21e49aSGerrit Renker * Note: X and X_recv are both stored in units of 64 * bytes/second, to support 1121a21e49aSGerrit Renker * fine-grained resolution of sending rates. This requires scaling by 2^6 1131a21e49aSGerrit Renker * throughout the code. Only X_calc is unscaled (in bytes/second). 1141a21e49aSGerrit Renker * 1155c3fbb6aSGerrit Renker * If X has changed, we also update the scheduled send time t_now, 1165c3fbb6aSGerrit Renker * the inter-packet interval t_ipi, and the delta value. 1177c657876SArnaldo Carvalho de Melo */ 118a79ef76fSGerrit Renker static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now) 119a79ef76fSGerrit Renker 1207c657876SArnaldo Carvalho de Melo { 12159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1221a21e49aSGerrit Renker const __u64 old_x = hctx->ccid3hctx_x; 1237c657876SArnaldo Carvalho de Melo 12444158306SGerrit Renker if (hctx->ccid3hctx_p > 0) { 1251a21e49aSGerrit Renker 1261a21e49aSGerrit Renker hctx->ccid3hctx_x = min_t(u64, hctx->ccid3hctx_x_calc << 6, 1271a21e49aSGerrit Renker hctx->ccid3hctx_x_recv * 2 ); 1281a21e49aSGerrit Renker hctx->ccid3hctx_x = max_t(u64, hctx->ccid3hctx_x, 1291a21e49aSGerrit Renker (hctx->ccid3hctx_s << 6)/TFRC_T_MBI); 130b6ee3d4aSArnaldo Carvalho de Melo 1310f9e5b57SGerrit Renker } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) - 1320f9e5b57SGerrit Renker (suseconds_t)hctx->ccid3hctx_rtt >= 0 ) { 1331a21e49aSGerrit Renker 1341a21e49aSGerrit Renker hctx->ccid3hctx_x = max(2 * min(hctx->ccid3hctx_x, 1351a21e49aSGerrit Renker hctx->ccid3hctx_x_recv), 1361a21e49aSGerrit Renker scaled_div(hctx->ccid3hctx_s << 6, 1376b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt )); 138a79ef76fSGerrit Renker hctx->ccid3hctx_t_ld = *now; 139ff586298SGerrit Renker } 140a79ef76fSGerrit Renker 14117893bc1SGerrit Renker if (hctx->ccid3hctx_x != old_x) 14217893bc1SGerrit Renker ccid3_update_send_time(hctx); 1437c657876SArnaldo Carvalho de Melo } 1447c657876SArnaldo Carvalho de Melo 14578ad713dSGerrit Renker /* 14678ad713dSGerrit Renker * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) 14778ad713dSGerrit Renker * @len: DCCP packet payload size in bytes 14878ad713dSGerrit Renker */ 14978ad713dSGerrit Renker static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) 15078ad713dSGerrit Renker { 15178ad713dSGerrit Renker if (unlikely(len == 0)) 15278ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 15378ad713dSGerrit Renker else 15478ad713dSGerrit Renker hctx->ccid3hctx_s = hctx->ccid3hctx_s == 0 ? len : 15578ad713dSGerrit Renker (9 * hctx->ccid3hctx_s + len) / 10; 15678ad713dSGerrit Renker /* 15778ad713dSGerrit Renker * Note: We could do a potential optimisation here - when `s' changes, 15878ad713dSGerrit Renker * recalculate sending rate and consequently t_ipi, t_delta, and 15978ad713dSGerrit Renker * t_now. This is however non-standard, and the benefits are not 16078ad713dSGerrit Renker * clear, so it is currently left out. 16178ad713dSGerrit Renker */ 16278ad713dSGerrit Renker } 16378ad713dSGerrit Renker 1649f8681dbSGerrit Renker /* 1659f8681dbSGerrit Renker * Update Window Counter using the algorithm from [RFC 4342, 8.1]. 1669f8681dbSGerrit Renker * The algorithm is not applicable if RTT < 4 microseconds. 1679f8681dbSGerrit Renker */ 1689f8681dbSGerrit Renker static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, 1699f8681dbSGerrit Renker struct timeval *now) 1709f8681dbSGerrit Renker { 1719f8681dbSGerrit Renker suseconds_t delta; 1729f8681dbSGerrit Renker u32 quarter_rtts; 1739f8681dbSGerrit Renker 1749f8681dbSGerrit Renker if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ 1759f8681dbSGerrit Renker return; 1769f8681dbSGerrit Renker 1779f8681dbSGerrit Renker delta = timeval_delta(now, &hctx->ccid3hctx_t_last_win_count); 1789f8681dbSGerrit Renker DCCP_BUG_ON(delta < 0); 1799f8681dbSGerrit Renker 1809f8681dbSGerrit Renker quarter_rtts = (u32)delta / (hctx->ccid3hctx_rtt / 4); 1819f8681dbSGerrit Renker 1829f8681dbSGerrit Renker if (quarter_rtts > 0) { 1839f8681dbSGerrit Renker hctx->ccid3hctx_t_last_win_count = *now; 1849f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); 1859f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ 1869f8681dbSGerrit Renker 1879f8681dbSGerrit Renker ccid3_pr_debug("now at %#X\n", hctx->ccid3hctx_last_win_count); 1889f8681dbSGerrit Renker } 1899f8681dbSGerrit Renker } 1909f8681dbSGerrit Renker 1917c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 1927c657876SArnaldo Carvalho de Melo { 1937c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 19459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1952a1fda6fSGerrit Renker unsigned long t_nfb = USEC_PER_SEC / 5; 1967c657876SArnaldo Carvalho de Melo 1977c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 1987c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 1997c657876SArnaldo Carvalho de Melo /* Try again later. */ 2007c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 20148e03eeeSGerrit Renker goto restart_timer; 2027c657876SArnaldo Carvalho de Melo } 2037c657876SArnaldo Carvalho de Melo 2047c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, 2057c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2067c657876SArnaldo Carvalho de Melo 2077c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 2087c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 209a79ef76fSGerrit Renker /* RFC 3448, 4.4: Halve send rate directly */ 210179ebc9fSGerrit Renker hctx->ccid3hctx_x = max_t(u32, hctx->ccid3hctx_x / 2, 2111a21e49aSGerrit Renker (hctx->ccid3hctx_s << 6)/TFRC_T_MBI); 2127c657876SArnaldo Carvalho de Melo 2131a21e49aSGerrit Renker ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %u " 2141f2333aeSArnaldo Carvalho de Melo "bytes/s\n", 2151f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2161f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 2171a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 21848e03eeeSGerrit Renker /* The value of R is still undefined and so we can not recompute 21948e03eeeSGerrit Renker * the timout value. Keep initial value as per [RFC 4342, 5]. */ 2202a1fda6fSGerrit Renker t_nfb = TFRC_INITIAL_TIMEOUT; 22117893bc1SGerrit Renker ccid3_update_send_time(hctx); 2227c657876SArnaldo Carvalho de Melo break; 2237c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 2241f2333aeSArnaldo Carvalho de Melo /* 2251f2333aeSArnaldo Carvalho de Melo * Check if IDLE since last timeout and recv rate is less than 2261a21e49aSGerrit Renker * 4 packets (in units of 64*bytes/sec) per RTT 2271f2333aeSArnaldo Carvalho de Melo */ 2281f2333aeSArnaldo Carvalho de Melo if (!hctx->ccid3hctx_idle || 2291a21e49aSGerrit Renker (hctx->ccid3hctx_x_recv >= 4 * 2301a21e49aSGerrit Renker scaled_div(hctx->ccid3hctx_s << 6, hctx->ccid3hctx_rtt))) { 231a79ef76fSGerrit Renker struct timeval now; 232a79ef76fSGerrit Renker 2331f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", 2341f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2357c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2367c657876SArnaldo Carvalho de Melo 237ff586298SGerrit Renker /* 238ff586298SGerrit Renker * Modify the cached value of X_recv [RFC 3448, 4.4] 239ff586298SGerrit Renker * 240ff586298SGerrit Renker * If (p == 0 || X_calc > 2 * X_recv) 2417c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2427c657876SArnaldo Carvalho de Melo * Else 2437c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2441a21e49aSGerrit Renker * 2451a21e49aSGerrit Renker * Note that X_recv is scaled by 2^6 while X_calc is not 2467c657876SArnaldo Carvalho de Melo */ 24744158306SGerrit Renker BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); 2487c657876SArnaldo Carvalho de Melo 24944158306SGerrit Renker if (hctx->ccid3hctx_p == 0 || 2501a21e49aSGerrit Renker hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5)) { 2511a21e49aSGerrit Renker 2521a21e49aSGerrit Renker hctx->ccid3hctx_x_recv = 2531a21e49aSGerrit Renker max_t(u64, hctx->ccid3hctx_x_recv / 2, 2541a21e49aSGerrit Renker (hctx->ccid3hctx_s << 6) / 2551a21e49aSGerrit Renker (2*TFRC_T_MBI)); 2561a21e49aSGerrit Renker 257ff586298SGerrit Renker if (hctx->ccid3hctx_p == 0) 258ff586298SGerrit Renker dccp_timestamp(sk, &now); 259ff586298SGerrit Renker } else 2601a21e49aSGerrit Renker hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc << 4; 2617c657876SArnaldo Carvalho de Melo 262ff586298SGerrit Renker /* Now recalculate X [RFC 3448, 4.3, step (4)] */ 263a79ef76fSGerrit Renker ccid3_hc_tx_update_x(sk, &now); 2647c657876SArnaldo Carvalho de Melo } 2656b5e633aSArnaldo Carvalho de Melo /* 2666b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2678a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 2688a508ac2SGerrit Renker * See comments in packet_recv() regarding the value of t_RTO. 2696b5e633aSArnaldo Carvalho de Melo */ 2708a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 2717c657876SArnaldo Carvalho de Melo break; 27259348b19SGerrit Renker case TFRC_SSTATE_NO_SENT: 27359348b19SGerrit Renker DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); 27459348b19SGerrit Renker /* fall through */ 27559348b19SGerrit Renker case TFRC_SSTATE_TERM: 2767c657876SArnaldo Carvalho de Melo goto out; 2777c657876SArnaldo Carvalho de Melo } 2787c657876SArnaldo Carvalho de Melo 2797c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 28048e03eeeSGerrit Renker 28148e03eeeSGerrit Renker restart_timer: 28248e03eeeSGerrit Renker sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2832a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 2847c657876SArnaldo Carvalho de Melo out: 2857c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2867c657876SArnaldo Carvalho de Melo sock_put(sk); 2877c657876SArnaldo Carvalho de Melo } 2887c657876SArnaldo Carvalho de Melo 2897da7f456SGerrit Renker /* 2907da7f456SGerrit Renker * returns 2917da7f456SGerrit Renker * > 0: delay (in msecs) that should pass before actually sending 2927da7f456SGerrit Renker * = 0: can send immediately 2937da7f456SGerrit Renker * < 0: error condition; do not send packet 2947da7f456SGerrit Renker */ 2956b57c93dSGerrit Renker static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) 2967c657876SArnaldo Carvalho de Melo { 2977c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 29859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2997c657876SArnaldo Carvalho de Melo struct timeval now; 3000f9e5b57SGerrit Renker suseconds_t delay; 3017c657876SArnaldo Carvalho de Melo 30259348b19SGerrit Renker BUG_ON(hctx == NULL); 3031f2333aeSArnaldo Carvalho de Melo 3047c657876SArnaldo Carvalho de Melo /* 305da335bafSGerrit Renker * This function is called only for Data and DataAck packets. Sending 306da335bafSGerrit Renker * zero-sized Data(Ack)s is theoretically possible, but for congestion 307da335bafSGerrit Renker * control this case is pathological - ignore it. 3087c657876SArnaldo Carvalho de Melo */ 3096b57c93dSGerrit Renker if (unlikely(skb->len == 0)) 310da335bafSGerrit Renker return -EBADMSG; 3117c657876SArnaldo Carvalho de Melo 312b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3137c657876SArnaldo Carvalho de Melo 3147c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3157c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3161f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3171f2333aeSArnaldo Carvalho de Melo jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); 3187c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3197c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3207c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3217c657876SArnaldo Carvalho de Melo 3221a21e49aSGerrit Renker /* Set initial sending rate X/s to 1pps (X is scaled by 2^6) */ 3236b57c93dSGerrit Renker ccid3_hc_tx_update_s(hctx, skb->len); 3241a21e49aSGerrit Renker hctx->ccid3hctx_x = hctx->ccid3hctx_s << 6; 32578ad713dSGerrit Renker 32690feeb95SGerrit Renker /* First timeout, according to [RFC 3448, 4.2], is 1 second */ 32790feeb95SGerrit Renker hctx->ccid3hctx_t_ipi = USEC_PER_SEC; 32890feeb95SGerrit Renker /* Initial delta: minimum of 0.5 sec and t_gran/2 */ 32990feeb95SGerrit Renker hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; 33090feeb95SGerrit Renker 33190feeb95SGerrit Renker /* Set t_0 for initial packet */ 3327c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 3337c657876SArnaldo Carvalho de Melo break; 3347c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3357c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 33691cf5a17SGerrit Renker delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); 33791cf5a17SGerrit Renker /* 33891cf5a17SGerrit Renker * Scheduling of packet transmissions [RFC 3448, 4.6] 33991cf5a17SGerrit Renker * 34091cf5a17SGerrit Renker * if (t_now > t_nom - delta) 34191cf5a17SGerrit Renker * // send the packet now 34291cf5a17SGerrit Renker * else 34391cf5a17SGerrit Renker * // send the packet in (t_nom - t_now) milliseconds. 34491cf5a17SGerrit Renker */ 3450f9e5b57SGerrit Renker if (delay - (suseconds_t)hctx->ccid3hctx_delta >= 0) 3467da7f456SGerrit Renker return delay / 1000L; 3479f8681dbSGerrit Renker 3489f8681dbSGerrit Renker ccid3_hc_tx_update_win_count(hctx, &now); 3497c657876SArnaldo Carvalho de Melo break; 35059348b19SGerrit Renker case TFRC_SSTATE_TERM: 35159348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 3527da7f456SGerrit Renker return -EINVAL; 3537c657876SArnaldo Carvalho de Melo } 3547c657876SArnaldo Carvalho de Melo 3557da7f456SGerrit Renker /* prepare to send now (add options etc.) */ 356507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 357e312d100SGerrit Renker DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 358e312d100SGerrit Renker 359e312d100SGerrit Renker /* set the nominal send time for the next following packet */ 3607da7f456SGerrit Renker timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); 3617da7f456SGerrit Renker 3627da7f456SGerrit Renker return 0; 3637c657876SArnaldo Carvalho de Melo } 3647c657876SArnaldo Carvalho de Melo 3656b57c93dSGerrit Renker static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len) 3667c657876SArnaldo Carvalho de Melo { 36759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3687c657876SArnaldo Carvalho de Melo struct timeval now; 3696b57c93dSGerrit Renker struct dccp_tx_hist_entry *packet; 3707c657876SArnaldo Carvalho de Melo 37159348b19SGerrit Renker BUG_ON(hctx == NULL); 3727c657876SArnaldo Carvalho de Melo 37378ad713dSGerrit Renker ccid3_hc_tx_update_s(hctx, len); 37478ad713dSGerrit Renker 375c5a1ae9aSGerrit Renker packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC); 37659d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 377c5a1ae9aSGerrit Renker DCCP_CRIT("packet history - out of memory!"); 3787c657876SArnaldo Carvalho de Melo return; 3797c657876SArnaldo Carvalho de Melo } 380c5a1ae9aSGerrit Renker dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, packet); 381c5a1ae9aSGerrit Renker 382c5a1ae9aSGerrit Renker dccp_timestamp(sk, &now); 3838c60f3faSArnaldo Carvalho de Melo packet->dccphtx_tstamp = now; 384c5a1ae9aSGerrit Renker packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss; 385c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 3868c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 387c5a1ae9aSGerrit Renker hctx->ccid3hctx_idle = 0; 3887c657876SArnaldo Carvalho de Melo } 3897c657876SArnaldo Carvalho de Melo 3907c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 3917c657876SArnaldo Carvalho de Melo { 39259725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 39359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3947c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 3958c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 396b0e56780SArnaldo Carvalho de Melo struct timeval now; 3972a1fda6fSGerrit Renker unsigned long t_nfb; 3987c657876SArnaldo Carvalho de Melo u32 pinv; 3995c3fbb6aSGerrit Renker long r_sample, t_elapsed; 4001f2333aeSArnaldo Carvalho de Melo 40159348b19SGerrit Renker BUG_ON(hctx == NULL); 4027c657876SArnaldo Carvalho de Melo 4037c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4047c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4057c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4067c657876SArnaldo Carvalho de Melo return; 4077c657876SArnaldo Carvalho de Melo 4087c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4097c657876SArnaldo Carvalho de Melo 4107c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4117c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4127c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4135c3fbb6aSGerrit Renker /* get packet from history to look up t_recvdata */ 4148c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4158c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 41659d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 4175c3fbb6aSGerrit Renker DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " 41859348b19SGerrit Renker "in history!\n", dccp_role(sk), sk, 41959d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4207c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4217c657876SArnaldo Carvalho de Melo return; 4227c657876SArnaldo Carvalho de Melo } 4237c657876SArnaldo Carvalho de Melo 4241a21e49aSGerrit Renker /* Update receive rate in units of 64 * bytes/second */ 4251a21e49aSGerrit Renker hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate << 6; 4265c3fbb6aSGerrit Renker 4275c3fbb6aSGerrit Renker /* Update loss event rate */ 4285c3fbb6aSGerrit Renker pinv = opt_recv->ccid3or_loss_event_rate; 42945393a66SGerrit Renker if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ 4305c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 0; 43145393a66SGerrit Renker else /* can not exceed 100% */ 4325c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 1000000 / pinv; 4335c3fbb6aSGerrit Renker 434b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 4355c3fbb6aSGerrit Renker 4365c3fbb6aSGerrit Renker /* 4375c3fbb6aSGerrit Renker * Calculate new round trip sample as per [RFC 3448, 4.3] by 4385c3fbb6aSGerrit Renker * R_sample = (now - t_recvdata) - t_elapsed 4395c3fbb6aSGerrit Renker */ 440b0e56780SArnaldo Carvalho de Melo r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); 4415c3fbb6aSGerrit Renker t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; 4425c3fbb6aSGerrit Renker 4430f9e5b57SGerrit Renker DCCP_BUG_ON(r_sample < 0); 4440f9e5b57SGerrit Renker if (unlikely(r_sample <= t_elapsed)) 4455c3fbb6aSGerrit Renker DCCP_WARN("WARNING: r_sample=%ldus <= t_elapsed=%ldus\n", 44659348b19SGerrit Renker r_sample, t_elapsed); 4471a28599aSArnaldo Carvalho de Melo else 4481a28599aSArnaldo Carvalho de Melo r_sample -= t_elapsed; 449de553c18SGerrit Renker CCID3_RTT_SANITY_CHECK(r_sample); 4507c657876SArnaldo Carvalho de Melo 4517c657876SArnaldo Carvalho de Melo /* Update RTT estimate by 4527c657876SArnaldo Carvalho de Melo * If (No feedback recv) 4537c657876SArnaldo Carvalho de Melo * R = R_sample; 4547c657876SArnaldo Carvalho de Melo * Else 4557c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 4567c657876SArnaldo Carvalho de Melo * 4577c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 4587c657876SArnaldo Carvalho de Melo */ 4597c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 4601a21e49aSGerrit Renker /* 4611a21e49aSGerrit Renker * Larger Initial Windows [RFC 4342, sec. 5] 4621a21e49aSGerrit Renker * We deviate in that we use `s' instead of `MSS'. 4631a21e49aSGerrit Renker */ 464179ebc9fSGerrit Renker u16 w_init = min( 4 * hctx->ccid3hctx_s, 465a79ef76fSGerrit Renker max(2 * hctx->ccid3hctx_s, 4380)); 4667c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 4671a21e49aSGerrit Renker hctx->ccid3hctx_x = scaled_div(w_init<< 6, r_sample); 468a79ef76fSGerrit Renker hctx->ccid3hctx_t_ld = now; 469a79ef76fSGerrit Renker 470a79ef76fSGerrit Renker ccid3_update_send_time(hctx); 4715c3fbb6aSGerrit Renker 4725c3fbb6aSGerrit Renker ccid3_pr_debug("%s(%p), s=%u, w_init=%u, " 4735c3fbb6aSGerrit Renker "R_sample=%ldus, X=%u\n", dccp_role(sk), 4745c3fbb6aSGerrit Renker sk, hctx->ccid3hctx_s, w_init, r_sample, 4751a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4765c3fbb6aSGerrit Renker 477a79ef76fSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 478a79ef76fSGerrit Renker } else { 4795c3fbb6aSGerrit Renker hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + 4805c3fbb6aSGerrit Renker (u32)r_sample ) / 10; 4815c3fbb6aSGerrit Renker 482ff586298SGerrit Renker /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ 483ff586298SGerrit Renker if (hctx->ccid3hctx_p > 0) 484ff586298SGerrit Renker hctx->ccid3hctx_x_calc = 485ff586298SGerrit Renker tfrc_calc_x(hctx->ccid3hctx_s, 486ff586298SGerrit Renker hctx->ccid3hctx_rtt, 487ff586298SGerrit Renker hctx->ccid3hctx_p); 488a79ef76fSGerrit Renker ccid3_hc_tx_update_x(sk, &now); 4897c657876SArnaldo Carvalho de Melo 4905c3fbb6aSGerrit Renker ccid3_pr_debug("%s(%p), RTT=%uus (sample=%ldus), s=%u, " 4915c3fbb6aSGerrit Renker "p=%u, X_calc=%u, X=%u\n", dccp_role(sk), 4925c3fbb6aSGerrit Renker sk, hctx->ccid3hctx_rtt, r_sample, 4935c3fbb6aSGerrit Renker hctx->ccid3hctx_s, hctx->ccid3hctx_p, 4945c3fbb6aSGerrit Renker hctx->ccid3hctx_x_calc, 4951a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4967c657876SArnaldo Carvalho de Melo } 4977c657876SArnaldo Carvalho de Melo 4987c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 4997c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5007c657876SArnaldo Carvalho de Melo 5017c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5028c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5038c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 504c530cfb1SArnaldo Carvalho de Melo /* 505c530cfb1SArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible that 5065d0dbc4aSGerrit Renker * we now can send a packet, so wake up dccp_wait_for_ccid 507c530cfb1SArnaldo Carvalho de Melo */ 508c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5098c60f3faSArnaldo Carvalho de Melo 5108a508ac2SGerrit Renker /* 5118a508ac2SGerrit Renker * Update timeout interval for the nofeedback timer. 5128a508ac2SGerrit Renker * We use a configuration option to increase the lower bound. 5138a508ac2SGerrit Renker * This can help avoid triggering the nofeedback timer too often 5148a508ac2SGerrit Renker * ('spinning') on LANs with small RTTs. 5158a508ac2SGerrit Renker */ 5165d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 5178a508ac2SGerrit Renker CONFIG_IP_DCCP_CCID3_RTO * 5188a508ac2SGerrit Renker (USEC_PER_SEC/1000) ); 5191f2333aeSArnaldo Carvalho de Melo /* 5201f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5218a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 5221f2333aeSArnaldo Carvalho de Melo */ 5238a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 5247c657876SArnaldo Carvalho de Melo 5251f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " 5261f2333aeSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5271f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 5282a1fda6fSGerrit Renker usecs_to_jiffies(t_nfb), t_nfb); 5297c657876SArnaldo Carvalho de Melo 5307c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5312a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 5327c657876SArnaldo Carvalho de Melo 5337c657876SArnaldo Carvalho de Melo /* set idle flag */ 5347c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5357c657876SArnaldo Carvalho de Melo break; 5365e19e3fcSGerrit Renker case TFRC_SSTATE_NO_SENT: 537bf58a381SGerrit Renker /* XXX when implementing bidirectional rx/tx check this again */ 53826af3072SGerrit Renker DCCP_WARN("Illegal ACK received - no packet sent\n"); 5395e19e3fcSGerrit Renker /* fall through */ 5405e19e3fcSGerrit Renker case TFRC_SSTATE_TERM: /* ignore feedback when closing */ 5417c657876SArnaldo Carvalho de Melo break; 5427c657876SArnaldo Carvalho de Melo } 5437c657876SArnaldo Carvalho de Melo } 5447c657876SArnaldo Carvalho de Melo 5457c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5461f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5471f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5487c657876SArnaldo Carvalho de Melo { 5497c657876SArnaldo Carvalho de Melo int rc = 0; 55059725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 55159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5527c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 5537c657876SArnaldo Carvalho de Melo 55459d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 5557c657876SArnaldo Carvalho de Melo 5567c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5577c657876SArnaldo Carvalho de Melo 5587c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5597c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5607c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5617c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5627c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5637c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5647c657876SArnaldo Carvalho de Melo } 5657c657876SArnaldo Carvalho de Melo 5667c657876SArnaldo Carvalho de Melo switch (option) { 5677c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 56859d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 56959348b19SGerrit Renker DCCP_WARN("%s, sk=%p, invalid len %d " 57059348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 57159348b19SGerrit Renker dccp_role(sk), sk, len); 5727c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5737c657876SArnaldo Carvalho de Melo } else { 57460fe62e7SAndrea Bittau opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); 5757c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", 5767c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5777c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 5787c657876SArnaldo Carvalho de Melo } 5797c657876SArnaldo Carvalho de Melo break; 5807c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 5817c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 5827c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 5837c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", 5847c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5857c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 5867c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 5877c657876SArnaldo Carvalho de Melo break; 5887c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 58959d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 59059348b19SGerrit Renker DCCP_WARN("%s, sk=%p, invalid len %d " 59159348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 59259348b19SGerrit Renker dccp_role(sk), sk, len); 5937c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5947c657876SArnaldo Carvalho de Melo } else { 59560fe62e7SAndrea Bittau opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); 5967c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", 5977c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5987c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 5997c657876SArnaldo Carvalho de Melo } 6007c657876SArnaldo Carvalho de Melo break; 6017c657876SArnaldo Carvalho de Melo } 6027c657876SArnaldo Carvalho de Melo 6037c657876SArnaldo Carvalho de Melo return rc; 6047c657876SArnaldo Carvalho de Melo } 6057c657876SArnaldo Carvalho de Melo 60691f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 6077c657876SArnaldo Carvalho de Melo { 60891f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 6097c657876SArnaldo Carvalho de Melo 61078ad713dSGerrit Renker hctx->ccid3hctx_s = 0; 611fe0499aeSGerrit Renker hctx->ccid3hctx_rtt = 0; 6127c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6137c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 614aa5d7df3SArnaldo Carvalho de Melo 615aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; 616aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 6177c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6187c657876SArnaldo Carvalho de Melo 6197c657876SArnaldo Carvalho de Melo return 0; 6207c657876SArnaldo Carvalho de Melo } 6217c657876SArnaldo Carvalho de Melo 6227c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6237c657876SArnaldo Carvalho de Melo { 62459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6257c657876SArnaldo Carvalho de Melo 6267c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 6277c657876SArnaldo Carvalho de Melo 6287c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6297c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6307c657876SArnaldo Carvalho de Melo 6317c657876SArnaldo Carvalho de Melo /* Empty packet history */ 6328c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 6337c657876SArnaldo Carvalho de Melo } 6347c657876SArnaldo Carvalho de Melo 6357c657876SArnaldo Carvalho de Melo /* 6367c657876SArnaldo Carvalho de Melo * RX Half Connection methods 6377c657876SArnaldo Carvalho de Melo */ 6387c657876SArnaldo Carvalho de Melo 63956724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6407c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6417c657876SArnaldo Carvalho de Melo { 6427c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6437c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6447c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6457c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6467c657876SArnaldo Carvalho de Melo }; 6477c657876SArnaldo Carvalho de Melo 6487c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6497c657876SArnaldo Carvalho de Melo } 6507c657876SArnaldo Carvalho de Melo #endif 6517c657876SArnaldo Carvalho de Melo 652c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 6531f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 6547c657876SArnaldo Carvalho de Melo { 65559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6567c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 6577c657876SArnaldo Carvalho de Melo 6587c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 6591f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 6601f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 6617c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 6627c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 6637c657876SArnaldo Carvalho de Melo } 6647c657876SArnaldo Carvalho de Melo 66578ad713dSGerrit Renker static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) 66678ad713dSGerrit Renker { 66778ad713dSGerrit Renker if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ 66878ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 66978ad713dSGerrit Renker else 67078ad713dSGerrit Renker hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : 67178ad713dSGerrit Renker (9 * hcrx->ccid3hcrx_s + len) / 10; 67278ad713dSGerrit Renker } 67378ad713dSGerrit Renker 6747c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 6757c657876SArnaldo Carvalho de Melo { 67659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6777c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 6788c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 679b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 6800f9e5b57SGerrit Renker suseconds_t delta; 6817c657876SArnaldo Carvalho de Melo 6827c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 6837c657876SArnaldo Carvalho de Melo 684b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 685b6ee3d4aSArnaldo Carvalho de Melo 6867c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 6877c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 6887c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 6897c657876SArnaldo Carvalho de Melo break; 6900f9e5b57SGerrit Renker case TFRC_RSTATE_DATA: 6910f9e5b57SGerrit Renker delta = timeval_delta(&now, 692b6ee3d4aSArnaldo Carvalho de Melo &hcrx->ccid3hcrx_tstamp_last_feedback); 6930f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 694b9039a2aSGerrit Renker hcrx->ccid3hcrx_x_recv = 695b9039a2aSGerrit Renker scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 6967c657876SArnaldo Carvalho de Melo break; 69759348b19SGerrit Renker case TFRC_RSTATE_TERM: 69859348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 6997c657876SArnaldo Carvalho de Melo return; 7007c657876SArnaldo Carvalho de Melo } 7017c657876SArnaldo Carvalho de Melo 7028c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 70359d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 70459348b19SGerrit Renker DCCP_WARN("%s, sk=%p, no data packet in history!\n", 70559348b19SGerrit Renker dccp_role(sk), sk); 7067c657876SArnaldo Carvalho de Melo return; 7077c657876SArnaldo Carvalho de Melo } 7087c657876SArnaldo Carvalho de Melo 709b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 71066a377c5SIan McDonald hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; 7117c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7127c657876SArnaldo Carvalho de Melo 7130f9e5b57SGerrit Renker /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */ 7140f9e5b57SGerrit Renker delta = timeval_delta(&now, &packet->dccphrx_tstamp); 7150f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 7160f9e5b57SGerrit Renker hcrx->ccid3hcrx_elapsed_time = delta / 10; 71745393a66SGerrit Renker 7187c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 71945393a66SGerrit Renker hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ 72045393a66SGerrit Renker else if (hcrx->ccid3hcrx_p > 1000000) { 72145393a66SGerrit Renker DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); 72245393a66SGerrit Renker hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ 72345393a66SGerrit Renker } else 7247c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 72545393a66SGerrit Renker 726507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7277c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7287c657876SArnaldo Carvalho de Melo } 7297c657876SArnaldo Carvalho de Melo 7302d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7317c657876SArnaldo Carvalho de Melo { 73259d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 73360fe62e7SAndrea Bittau __be32 x_recv, pinv; 7347c657876SArnaldo Carvalho de Melo 73559d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 73659d203f9SArnaldo Carvalho de Melo 73759d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7382d0817d1SArnaldo Carvalho de Melo return 0; 7397c657876SArnaldo Carvalho de Melo 74066a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 7414fded33bSArnaldo Carvalho de Melo 7424fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7432d0817d1SArnaldo Carvalho de Melo return 0; 7444fded33bSArnaldo Carvalho de Melo 7454fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7464fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7472d0817d1SArnaldo Carvalho de Melo 7482d0817d1SArnaldo Carvalho de Melo if ((hcrx->ccid3hcrx_elapsed_time != 0 && 7492d0817d1SArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 7502d0817d1SArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time)) || 7512d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb) || 7524fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7532d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7544fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 7552d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 7562d0817d1SArnaldo Carvalho de Melo return -1; 7572d0817d1SArnaldo Carvalho de Melo 7582d0817d1SArnaldo Carvalho de Melo return 0; 7597c657876SArnaldo Carvalho de Melo } 7607c657876SArnaldo Carvalho de Melo 7617c657876SArnaldo Carvalho de Melo /* calculate first loss interval 7627c657876SArnaldo Carvalho de Melo * 7637c657876SArnaldo Carvalho de Melo * returns estimated loss interval in usecs */ 7647c657876SArnaldo Carvalho de Melo 7657c657876SArnaldo Carvalho de Melo static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) 7667c657876SArnaldo Carvalho de Melo { 76759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7688c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *entry, *next, *tail = NULL; 7690f9e5b57SGerrit Renker u32 x_recv, p; 7700f9e5b57SGerrit Renker suseconds_t rtt, delta; 771b6ee3d4aSArnaldo Carvalho de Melo struct timeval tstamp = { 0, }; 7727c657876SArnaldo Carvalho de Melo int interval = 0; 7737c657876SArnaldo Carvalho de Melo int win_count = 0; 7747c657876SArnaldo Carvalho de Melo int step = 0; 775bfe24a6cSGerrit Renker u64 fval; 7767c657876SArnaldo Carvalho de Melo 7778c60f3faSArnaldo Carvalho de Melo list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, 7788c60f3faSArnaldo Carvalho de Melo dccphrx_node) { 7798c60f3faSArnaldo Carvalho de Melo if (dccp_rx_hist_entry_data_packet(entry)) { 7807c657876SArnaldo Carvalho de Melo tail = entry; 7817c657876SArnaldo Carvalho de Melo 7827c657876SArnaldo Carvalho de Melo switch (step) { 7837c657876SArnaldo Carvalho de Melo case 0: 7848c60f3faSArnaldo Carvalho de Melo tstamp = entry->dccphrx_tstamp; 785c1734376SArnaldo Carvalho de Melo win_count = entry->dccphrx_ccval; 7867c657876SArnaldo Carvalho de Melo step = 1; 7877c657876SArnaldo Carvalho de Melo break; 7887c657876SArnaldo Carvalho de Melo case 1: 789c1734376SArnaldo Carvalho de Melo interval = win_count - entry->dccphrx_ccval; 7907c657876SArnaldo Carvalho de Melo if (interval < 0) 7917c657876SArnaldo Carvalho de Melo interval += TFRC_WIN_COUNT_LIMIT; 7927c657876SArnaldo Carvalho de Melo if (interval > 4) 7937c657876SArnaldo Carvalho de Melo goto found; 7947c657876SArnaldo Carvalho de Melo break; 7957c657876SArnaldo Carvalho de Melo } 7967c657876SArnaldo Carvalho de Melo } 7977c657876SArnaldo Carvalho de Melo } 7987c657876SArnaldo Carvalho de Melo 79959d203f9SArnaldo Carvalho de Melo if (unlikely(step == 0)) { 80059348b19SGerrit Renker DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", 80159348b19SGerrit Renker dccp_role(sk), sk); 8027c657876SArnaldo Carvalho de Melo return ~0; 8037c657876SArnaldo Carvalho de Melo } 8047c657876SArnaldo Carvalho de Melo 80559d203f9SArnaldo Carvalho de Melo if (unlikely(interval == 0)) { 80659348b19SGerrit Renker DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." 80759348b19SGerrit Renker "Defaulting to 1\n", dccp_role(sk), sk); 8087c657876SArnaldo Carvalho de Melo interval = 1; 8097c657876SArnaldo Carvalho de Melo } 8107c657876SArnaldo Carvalho de Melo found: 81166a377c5SIan McDonald if (!tail) { 81259348b19SGerrit Renker DCCP_CRIT("tail is null\n"); 81366a377c5SIan McDonald return ~0; 81466a377c5SIan McDonald } 8150f9e5b57SGerrit Renker 8160f9e5b57SGerrit Renker delta = timeval_delta(&tstamp, &tail->dccphrx_tstamp); 8170f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 8180f9e5b57SGerrit Renker 8190f9e5b57SGerrit Renker rtt = delta * 4 / interval; 8200f9e5b57SGerrit Renker ccid3_pr_debug("%s, sk=%p, approximated RTT to %ldus\n", 8217c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, rtt); 82259348b19SGerrit Renker 823bfe24a6cSGerrit Renker /* 824bfe24a6cSGerrit Renker * Determine the length of the first loss interval via inverse lookup. 825bfe24a6cSGerrit Renker * Assume that X_recv can be computed by the throughput equation 826bfe24a6cSGerrit Renker * s 827bfe24a6cSGerrit Renker * X_recv = -------- 828bfe24a6cSGerrit Renker * R * fval 829bfe24a6cSGerrit Renker * Find some p such that f(p) = fval; return 1/p [RFC 3448, 6.3.1]. 830bfe24a6cSGerrit Renker */ 831bfe24a6cSGerrit Renker if (rtt == 0) { /* would result in divide-by-zero */ 832bfe24a6cSGerrit Renker DCCP_WARN("RTT==0, returning 1/p = 1\n"); 833bfe24a6cSGerrit Renker return 1000000; 83459348b19SGerrit Renker } 8357c657876SArnaldo Carvalho de Melo 836b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &tstamp); 837b0e56780SArnaldo Carvalho de Melo delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); 8380f9e5b57SGerrit Renker DCCP_BUG_ON(delta <= 0); 8397c657876SArnaldo Carvalho de Melo 8400f9e5b57SGerrit Renker x_recv = scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 841bfe24a6cSGerrit Renker if (x_recv == 0) { /* would also trigger divide-by-zero */ 842bfe24a6cSGerrit Renker DCCP_WARN("X_recv==0\n"); 843bfe24a6cSGerrit Renker if ((x_recv = hcrx->ccid3hcrx_x_recv) == 0) { 844bfe24a6cSGerrit Renker DCCP_BUG("stored value of X_recv is zero"); 845bfe24a6cSGerrit Renker return 1000000; 846bfe24a6cSGerrit Renker } 84766a377c5SIan McDonald } 84866a377c5SIan McDonald 849bfe24a6cSGerrit Renker fval = scaled_div(hcrx->ccid3hcrx_s, rtt); 850bfe24a6cSGerrit Renker fval = scaled_div32(fval, x_recv); 85136729c1aSArnaldo Carvalho de Melo p = tfrc_calc_x_reverse_lookup(fval); 852bfe24a6cSGerrit Renker 8531f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " 8541f2333aeSArnaldo Carvalho de Melo "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 8557c657876SArnaldo Carvalho de Melo 8567c657876SArnaldo Carvalho de Melo if (p == 0) 8577c657876SArnaldo Carvalho de Melo return ~0; 8587c657876SArnaldo Carvalho de Melo else 8597c657876SArnaldo Carvalho de Melo return 1000000 / p; 8607c657876SArnaldo Carvalho de Melo } 8617c657876SArnaldo Carvalho de Melo 8627c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) 8637c657876SArnaldo Carvalho de Melo { 86459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 865fc747e82SIan McDonald struct dccp_li_hist_entry *head; 86666a377c5SIan McDonald u64 seq_temp; 8677c657876SArnaldo Carvalho de Melo 86866a377c5SIan McDonald if (list_empty(&hcrx->ccid3hcrx_li_hist)) { 86966a377c5SIan McDonald if (!dccp_li_hist_interval_new(ccid3_li_hist, 87066a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) 871ae6706f0SArnaldo Carvalho de Melo return; 87266a377c5SIan McDonald 873fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 874fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 875fc747e82SIan McDonald head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); 87666a377c5SIan McDonald } else { 87766a377c5SIan McDonald struct dccp_li_hist_entry *entry; 87866a377c5SIan McDonald struct list_head *tail; 87966a377c5SIan McDonald 880fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 881fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 88266a377c5SIan McDonald /* FIXME win count check removed as was wrong */ 88366a377c5SIan McDonald /* should make this check with receive history */ 88466a377c5SIan McDonald /* and compare there as per section 10.2 of RFC4342 */ 88566a377c5SIan McDonald 88666a377c5SIan McDonald /* new loss event detected */ 88766a377c5SIan McDonald /* calculate last interval length */ 88866a377c5SIan McDonald seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); 88954e6ecb2SChristoph Lameter entry = dccp_li_hist_entry_new(ccid3_li_hist, GFP_ATOMIC); 89066a377c5SIan McDonald 89166a377c5SIan McDonald if (entry == NULL) { 89259348b19SGerrit Renker DCCP_BUG("out of memory - can not allocate entry"); 89366a377c5SIan McDonald return; 8947c657876SArnaldo Carvalho de Melo } 8957c657876SArnaldo Carvalho de Melo 89666a377c5SIan McDonald list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); 89766a377c5SIan McDonald 89866a377c5SIan McDonald tail = hcrx->ccid3hcrx_li_hist.prev; 89966a377c5SIan McDonald list_del(tail); 90066a377c5SIan McDonald kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); 90166a377c5SIan McDonald 90266a377c5SIan McDonald /* Create the newest interval */ 90366a377c5SIan McDonald entry->dccplih_seqno = seq_loss; 90466a377c5SIan McDonald entry->dccplih_interval = seq_temp; 90566a377c5SIan McDonald entry->dccplih_win_count = win_loss; 90666a377c5SIan McDonald } 90766a377c5SIan McDonald } 90866a377c5SIan McDonald 90966a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 91066a377c5SIan McDonald struct dccp_rx_hist_entry *packet) 9117c657876SArnaldo Carvalho de Melo { 91259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 91366a377c5SIan McDonald struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); 91466a377c5SIan McDonald u64 seqno = packet->dccphrx_seqno; 91566a377c5SIan McDonald u64 tmp_seqno; 91666a377c5SIan McDonald int loss = 0; 91766a377c5SIan McDonald u8 ccval; 9187c657876SArnaldo Carvalho de Melo 91966a377c5SIan McDonald 92066a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 92166a377c5SIan McDonald 92266a377c5SIan McDonald if (!rx_hist || 92366a377c5SIan McDonald follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 92466a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 92566a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 92666a377c5SIan McDonald goto detect_out; 92766a377c5SIan McDonald } 92866a377c5SIan McDonald 92966a377c5SIan McDonald 93066a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 93166a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 93266a377c5SIan McDonald loss = 1; 93366a377c5SIan McDonald ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, 93466a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 93566a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 93666a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 93766a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 93866a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 93966a377c5SIan McDonald while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 94066a377c5SIan McDonald tmp_seqno, &ccval)) { 94166a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 94266a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 94366a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 94466a377c5SIan McDonald } 94566a377c5SIan McDonald } 94666a377c5SIan McDonald 94766a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 94866a377c5SIan McDonald /* but works at moment */ 94966a377c5SIan McDonald if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 95066a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 95166a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 95266a377c5SIan McDonald } 95366a377c5SIan McDonald 95466a377c5SIan McDonald detect_out: 95566a377c5SIan McDonald dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 95666a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 95766a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 95866a377c5SIan McDonald return loss; 9597c657876SArnaldo Carvalho de Melo } 9607c657876SArnaldo Carvalho de Melo 9617c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 9627c657876SArnaldo Carvalho de Melo { 96359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9644fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 9658c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 9667c657876SArnaldo Carvalho de Melo struct timeval now; 9670f9e5b57SGerrit Renker u32 p_prev, rtt_prev; 9680f9e5b57SGerrit Renker suseconds_t r_sample, t_elapsed; 96978ad713dSGerrit Renker int loss, payload_size; 9701f2333aeSArnaldo Carvalho de Melo 97159348b19SGerrit Renker BUG_ON(hcrx == NULL); 9727c657876SArnaldo Carvalho de Melo 97359725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 9744fded33bSArnaldo Carvalho de Melo 9757c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 9767c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 9777c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 9787c657876SArnaldo Carvalho de Melo return; 9797c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 9804fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 9817c657876SArnaldo Carvalho de Melo break; 98266a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 983b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 984b3a3077dSArnaldo Carvalho de Melo timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); 985b3a3077dSArnaldo Carvalho de Melo r_sample = timeval_usecs(&now); 986b3a3077dSArnaldo Carvalho de Melo t_elapsed = opt_recv->dccpor_elapsed_time * 10; 987b3a3077dSArnaldo Carvalho de Melo 9880f9e5b57SGerrit Renker DCCP_BUG_ON(r_sample < 0); 989b3a3077dSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 9900f9e5b57SGerrit Renker DCCP_WARN("r_sample=%ldus, t_elapsed=%ldus\n", 99159348b19SGerrit Renker r_sample, t_elapsed); 992b3a3077dSArnaldo Carvalho de Melo else 993b3a3077dSArnaldo Carvalho de Melo r_sample -= t_elapsed; 994de553c18SGerrit Renker CCID3_RTT_SANITY_CHECK(r_sample); 995b3a3077dSArnaldo Carvalho de Melo 996b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 997b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 998b3a3077dSArnaldo Carvalho de Melo else 999b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 1000b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 1001b3a3077dSArnaldo Carvalho de Melo 100266a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 100366a377c5SIan McDonald ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", 10044fded33bSArnaldo Carvalho de Melo dccp_role(sk), hcrx->ccid3hcrx_rtt, 10054fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 10067c657876SArnaldo Carvalho de Melo break; 10077c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 10087c657876SArnaldo Carvalho de Melo break; 100959d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 10107c657876SArnaldo Carvalho de Melo return; 10117c657876SArnaldo Carvalho de Melo } 10127c657876SArnaldo Carvalho de Melo 1013b0e56780SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, 101454e6ecb2SChristoph Lameter skb, GFP_ATOMIC); 101559d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 101659348b19SGerrit Renker DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " 101759348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 10187c657876SArnaldo Carvalho de Melo return; 10197c657876SArnaldo Carvalho de Melo } 10207c657876SArnaldo Carvalho de Melo 102166a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 10227c657876SArnaldo Carvalho de Melo 10237c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 10247c657876SArnaldo Carvalho de Melo return; 10257c657876SArnaldo Carvalho de Melo 102678ad713dSGerrit Renker payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; 102778ad713dSGerrit Renker ccid3_hc_rx_update_s(hcrx, payload_size); 102878ad713dSGerrit Renker 10297c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 10307c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 10311f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " 10321f2333aeSArnaldo Carvalho de Melo "feedback\n", 10331f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 10341f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 10357c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10367c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 10377c657876SArnaldo Carvalho de Melo return; 10387c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 103978ad713dSGerrit Renker hcrx->ccid3hcrx_bytes_recv += payload_size; 104066a377c5SIan McDonald if (loss) 1041b6ee3d4aSArnaldo Carvalho de Melo break; 1042b6ee3d4aSArnaldo Carvalho de Melo 1043b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 10440f9e5b57SGerrit Renker if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) - 10450f9e5b57SGerrit Renker (suseconds_t)hcrx->ccid3hcrx_rtt >= 0) { 1046b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 10477c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10487c657876SArnaldo Carvalho de Melo } 10497c657876SArnaldo Carvalho de Melo return; 105059348b19SGerrit Renker case TFRC_RSTATE_TERM: 105159348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 10527c657876SArnaldo Carvalho de Melo return; 10537c657876SArnaldo Carvalho de Melo } 10547c657876SArnaldo Carvalho de Melo 10557c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 10564fded33bSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", 10574fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 10587c657876SArnaldo Carvalho de Melo 10597c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 10607c657876SArnaldo Carvalho de Melo 10617c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 1062c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 1063c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 1064c0996660SIan McDonald 10657c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 1066c0996660SIan McDonald if (i_mean != 0) 1067c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 106859348b19SGerrit Renker } else 106959348b19SGerrit Renker DCCP_BUG("empty loss history"); 10707c657876SArnaldo Carvalho de Melo 10717c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 10727c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10737c657876SArnaldo Carvalho de Melo return; 10747c657876SArnaldo Carvalho de Melo } 10757c657876SArnaldo Carvalho de Melo } 10767c657876SArnaldo Carvalho de Melo 107791f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 10787c657876SArnaldo Carvalho de Melo { 107991f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 10807c657876SArnaldo Carvalho de Melo 10817c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 10827c657876SArnaldo Carvalho de Melo 10837c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 10847c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 1085ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 1086b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); 1087954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; 108878ad713dSGerrit Renker hcrx->ccid3hcrx_s = 0; 1089fe0499aeSGerrit Renker hcrx->ccid3hcrx_rtt = 0; 10907c657876SArnaldo Carvalho de Melo return 0; 10917c657876SArnaldo Carvalho de Melo } 10927c657876SArnaldo Carvalho de Melo 10937c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 10947c657876SArnaldo Carvalho de Melo { 109559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 10967c657876SArnaldo Carvalho de Melo 109759d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 10987c657876SArnaldo Carvalho de Melo 10997c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 11007c657876SArnaldo Carvalho de Melo 11017c657876SArnaldo Carvalho de Melo /* Empty packet history */ 11028c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 11037c657876SArnaldo Carvalho de Melo 11047c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 1105ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); 11067c657876SArnaldo Carvalho de Melo } 11077c657876SArnaldo Carvalho de Melo 11082babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 11092babe1f6SArnaldo Carvalho de Melo { 111059725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 11112babe1f6SArnaldo Carvalho de Melo 111259c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 111359c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 111459c2353dSArnaldo Carvalho de Melo return; 111559c2353dSArnaldo Carvalho de Melo 111659d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 11172babe1f6SArnaldo Carvalho de Melo 11182babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 11192babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 11202babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 11212babe1f6SArnaldo Carvalho de Melo } 11222babe1f6SArnaldo Carvalho de Melo 11232babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 11242babe1f6SArnaldo Carvalho de Melo { 112559725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 11262babe1f6SArnaldo Carvalho de Melo 112759c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 112859c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 112959c2353dSArnaldo Carvalho de Melo return; 113059c2353dSArnaldo Carvalho de Melo 113159d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 11322babe1f6SArnaldo Carvalho de Melo 11332babe1f6SArnaldo Carvalho de Melo info->tcpi_rto = hctx->ccid3hctx_t_rto; 11342babe1f6SArnaldo Carvalho de Melo info->tcpi_rtt = hctx->ccid3hctx_rtt; 11352babe1f6SArnaldo Carvalho de Melo } 11362babe1f6SArnaldo Carvalho de Melo 113788f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 113888f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 113988f964dbSArnaldo Carvalho de Melo { 114088f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 114188f964dbSArnaldo Carvalho de Melo const void *val; 114288f964dbSArnaldo Carvalho de Melo 114388f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 114488f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 114588f964dbSArnaldo Carvalho de Melo return -EINVAL; 114688f964dbSArnaldo Carvalho de Melo 114788f964dbSArnaldo Carvalho de Melo switch (optname) { 114888f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 114988f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 115088f964dbSArnaldo Carvalho de Melo return -EINVAL; 115188f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 115288f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 115388f964dbSArnaldo Carvalho de Melo break; 115488f964dbSArnaldo Carvalho de Melo default: 115588f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 115688f964dbSArnaldo Carvalho de Melo } 115788f964dbSArnaldo Carvalho de Melo 115888f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 115988f964dbSArnaldo Carvalho de Melo return -EFAULT; 116088f964dbSArnaldo Carvalho de Melo 116188f964dbSArnaldo Carvalho de Melo return 0; 116288f964dbSArnaldo Carvalho de Melo } 116388f964dbSArnaldo Carvalho de Melo 116488f964dbSArnaldo Carvalho de Melo static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 116588f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 116688f964dbSArnaldo Carvalho de Melo { 116788f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 116888f964dbSArnaldo Carvalho de Melo const void *val; 116988f964dbSArnaldo Carvalho de Melo 117088f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 117188f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 117288f964dbSArnaldo Carvalho de Melo return -EINVAL; 117388f964dbSArnaldo Carvalho de Melo 117488f964dbSArnaldo Carvalho de Melo switch (optname) { 117588f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_TX_INFO: 117688f964dbSArnaldo Carvalho de Melo if (len < sizeof(hctx->ccid3hctx_tfrc)) 117788f964dbSArnaldo Carvalho de Melo return -EINVAL; 117888f964dbSArnaldo Carvalho de Melo len = sizeof(hctx->ccid3hctx_tfrc); 117988f964dbSArnaldo Carvalho de Melo val = &hctx->ccid3hctx_tfrc; 118088f964dbSArnaldo Carvalho de Melo break; 118188f964dbSArnaldo Carvalho de Melo default: 118288f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 118388f964dbSArnaldo Carvalho de Melo } 118488f964dbSArnaldo Carvalho de Melo 118588f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 118688f964dbSArnaldo Carvalho de Melo return -EFAULT; 118788f964dbSArnaldo Carvalho de Melo 118888f964dbSArnaldo Carvalho de Melo return 0; 118988f964dbSArnaldo Carvalho de Melo } 119088f964dbSArnaldo Carvalho de Melo 119191f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 11923dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 11937c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 11947c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 119591f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 11967c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 11977c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 11987c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 11997c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 12007c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 12017c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 120291f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 12037c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 12047c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 12057c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 12067c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 12072babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 12082babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 120988f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 121088f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 12117c657876SArnaldo Carvalho de Melo }; 12127c657876SArnaldo Carvalho de Melo 121356724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 12147c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 12157c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 121656724aa4SGerrit Renker #endif 12177c657876SArnaldo Carvalho de Melo 12187c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 12197c657876SArnaldo Carvalho de Melo { 12208c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 12217c657876SArnaldo Carvalho de Melo 12228c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 12238c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 12247c657876SArnaldo Carvalho de Melo goto out; 12257c657876SArnaldo Carvalho de Melo 12268c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 12278c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 12288c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 12297c657876SArnaldo Carvalho de Melo 1230ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = dccp_li_hist_new("ccid3"); 1231ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist == NULL) 12328c60f3faSArnaldo Carvalho de Melo goto out_free_tx; 12337c657876SArnaldo Carvalho de Melo 12347c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 12357c657876SArnaldo Carvalho de Melo if (rc != 0) 12367c657876SArnaldo Carvalho de Melo goto out_free_loss_interval_history; 12377c657876SArnaldo Carvalho de Melo out: 12387c657876SArnaldo Carvalho de Melo return rc; 12398c60f3faSArnaldo Carvalho de Melo 12407c657876SArnaldo Carvalho de Melo out_free_loss_interval_history: 1241ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1242ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12438c60f3faSArnaldo Carvalho de Melo out_free_tx: 12448c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12458c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12468c60f3faSArnaldo Carvalho de Melo out_free_rx: 12478c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12488c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12497c657876SArnaldo Carvalho de Melo goto out; 12507c657876SArnaldo Carvalho de Melo } 12517c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 12527c657876SArnaldo Carvalho de Melo 12537c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 12547c657876SArnaldo Carvalho de Melo { 12557c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 12567c657876SArnaldo Carvalho de Melo 12578c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 12588c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12598c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12607c657876SArnaldo Carvalho de Melo } 12618c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 12628c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12638c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12647c657876SArnaldo Carvalho de Melo } 1265ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist != NULL) { 1266ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1267ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12687c657876SArnaldo Carvalho de Melo } 12697c657876SArnaldo Carvalho de Melo } 12707c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 12717c657876SArnaldo Carvalho de Melo 1272e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 12731f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 12747c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 12757c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 12767c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1277