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 #include "../ccid.h" 377c657876SArnaldo Carvalho de Melo #include "../dccp.h" 384524b259SArnaldo Carvalho de Melo #include "lib/packet_history.h" 39ae6706f0SArnaldo Carvalho de Melo #include "lib/loss_interval.h" 4036729c1aSArnaldo Carvalho de Melo #include "lib/tfrc.h" 417c657876SArnaldo Carvalho de Melo #include "ccid3.h" 427c657876SArnaldo Carvalho de Melo 4356724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 4456724aa4SGerrit Renker static int ccid3_debug; 4556724aa4SGerrit Renker #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) 467c657876SArnaldo Carvalho de Melo #else 477c657876SArnaldo Carvalho de Melo #define ccid3_pr_debug(format, a...) 487c657876SArnaldo Carvalho de Melo #endif 497c657876SArnaldo Carvalho de Melo 50a1d3a355SArnaldo Carvalho de Melo static struct dccp_tx_hist *ccid3_tx_hist; 51a1d3a355SArnaldo Carvalho de Melo static struct dccp_rx_hist *ccid3_rx_hist; 52ae6706f0SArnaldo Carvalho de Melo static struct dccp_li_hist *ccid3_li_hist; 537c657876SArnaldo Carvalho de Melo 549bf17475SGerrit Renker /* 559bf17475SGerrit Renker * Transmitter Half-Connection Routines 569bf17475SGerrit Renker */ 5756724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 587c657876SArnaldo Carvalho de Melo static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) 597c657876SArnaldo Carvalho de Melo { 607c657876SArnaldo Carvalho de Melo static char *ccid3_state_names[] = { 617c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_SENT] = "NO_SENT", 627c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", 637c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_FBACK] = "FBACK", 647c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_TERM] = "TERM", 657c657876SArnaldo Carvalho de Melo }; 667c657876SArnaldo Carvalho de Melo 677c657876SArnaldo Carvalho de Melo return ccid3_state_names[state]; 687c657876SArnaldo Carvalho de Melo } 697c657876SArnaldo Carvalho de Melo #endif 707c657876SArnaldo Carvalho de Melo 71c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_tx_set_state(struct sock *sk, 721f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_tx_states state) 737c657876SArnaldo Carvalho de Melo { 7459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 757c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; 767c657876SArnaldo Carvalho de Melo 777c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 781f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_tx_state_name(oldstate), 791f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(state)); 807c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 817c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = state; 827c657876SArnaldo Carvalho de Melo } 837c657876SArnaldo Carvalho de Melo 8417893bc1SGerrit Renker /* 851266adeeSGerrit Renker * Recalculate t_ipi and delta (should be called whenever X changes) 8617893bc1SGerrit Renker */ 871266adeeSGerrit Renker static inline void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hctx) 887c657876SArnaldo Carvalho de Melo { 891a21e49aSGerrit Renker /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */ 901a21e49aSGerrit Renker hctx->ccid3hctx_t_ipi = scaled_div(hctx->ccid3hctx_s, 911a21e49aSGerrit Renker hctx->ccid3hctx_x >> 6); 9217893bc1SGerrit Renker 937c657876SArnaldo Carvalho de Melo /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ 941f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, 951f2333aeSArnaldo Carvalho de Melo TFRC_OPSYS_HALF_TIME_GRAN); 968699be7dSIan McDonald 978699be7dSIan McDonald ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%llu\n", 988699be7dSIan McDonald hctx->ccid3hctx_t_ipi, hctx->ccid3hctx_delta, 998699be7dSIan McDonald hctx->ccid3hctx_s, hctx->ccid3hctx_x >> 6); 1008699be7dSIan McDonald 1017c657876SArnaldo Carvalho de Melo } 1027c657876SArnaldo Carvalho de Melo /* 1037c657876SArnaldo Carvalho de Melo * Update X by 1047c657876SArnaldo Carvalho de Melo * If (p > 0) 1055c3fbb6aSGerrit Renker * X_calc = calcX(s, R, p); 1067c657876SArnaldo Carvalho de Melo * X = max(min(X_calc, 2 * X_recv), s / t_mbi); 1077c657876SArnaldo Carvalho de Melo * Else 1087c657876SArnaldo Carvalho de Melo * If (now - tld >= R) 1097c657876SArnaldo Carvalho de Melo * X = max(min(2 * X, 2 * X_recv), s / R); 1107c657876SArnaldo Carvalho de Melo * tld = now; 1115c3fbb6aSGerrit Renker * 1121a21e49aSGerrit Renker * Note: X and X_recv are both stored in units of 64 * bytes/second, to support 1131a21e49aSGerrit Renker * fine-grained resolution of sending rates. This requires scaling by 2^6 1141a21e49aSGerrit Renker * throughout the code. Only X_calc is unscaled (in bytes/second). 1151a21e49aSGerrit Renker * 1167c657876SArnaldo Carvalho de Melo */ 117a79ef76fSGerrit Renker static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now) 118a79ef76fSGerrit Renker 1197c657876SArnaldo Carvalho de Melo { 12059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1211a21e49aSGerrit Renker const __u64 old_x = hctx->ccid3hctx_x; 1227c657876SArnaldo Carvalho de Melo 12344158306SGerrit Renker if (hctx->ccid3hctx_p > 0) { 1241a21e49aSGerrit Renker 1259e8efc82SGerrit Renker hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6, 1261a21e49aSGerrit Renker hctx->ccid3hctx_x_recv * 2); 1279e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, 1289e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 1299e8efc82SGerrit Renker 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 1349e8efc82SGerrit Renker hctx->ccid3hctx_x = 1359e8efc82SGerrit Renker max(2 * min(hctx->ccid3hctx_x, hctx->ccid3hctx_x_recv), 1369e8efc82SGerrit Renker scaled_div(((__u64)hctx->ccid3hctx_s) << 6, 1376b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 138a79ef76fSGerrit Renker hctx->ccid3hctx_t_ld = *now; 139ff586298SGerrit Renker } 140a79ef76fSGerrit Renker 1418699be7dSIan McDonald if (hctx->ccid3hctx_x != old_x) { 1428699be7dSIan McDonald ccid3_pr_debug("X_prev=%llu, X_now=%llu, X_calc=%u, " 1438699be7dSIan McDonald "X_recv=%llu\n", old_x >> 6, hctx->ccid3hctx_x >> 6, 1448699be7dSIan McDonald hctx->ccid3hctx_x_calc, hctx->ccid3hctx_x_recv >> 6); 1458699be7dSIan McDonald 1461266adeeSGerrit Renker ccid3_update_send_interval(hctx); 1477c657876SArnaldo Carvalho de Melo } 1488699be7dSIan McDonald } 1497c657876SArnaldo Carvalho de Melo 15078ad713dSGerrit Renker /* 15178ad713dSGerrit Renker * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) 15278ad713dSGerrit Renker * @len: DCCP packet payload size in bytes 15378ad713dSGerrit Renker */ 15478ad713dSGerrit Renker static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) 15578ad713dSGerrit Renker { 1561266adeeSGerrit Renker const u16 old_s = hctx->ccid3hctx_s; 1571266adeeSGerrit Renker 1581266adeeSGerrit Renker hctx->ccid3hctx_s = old_s == 0 ? len : (9 * old_s + len) / 10; 1591266adeeSGerrit Renker 1601266adeeSGerrit Renker if (hctx->ccid3hctx_s != old_s) 1611266adeeSGerrit Renker ccid3_update_send_interval(hctx); 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 204a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s) - entry \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 */ 2109e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2, 2119e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2129e8efc82SGerrit Renker TFRC_T_MBI); 2137c657876SArnaldo Carvalho de Melo 214a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u " 215a9672411SGerrit Renker "bytes/s\n", 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; 2211266adeeSGerrit Renker ccid3_update_send_interval(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 * 2308109b02bSArnaldo Carvalho de Melo scaled_div(((__u64)hctx->ccid3hctx_s) << 6, 2318109b02bSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt))) { 232a79ef76fSGerrit Renker struct timeval now; 233a79ef76fSGerrit Renker 234a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), not idle\n", 2351f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2367c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2377c657876SArnaldo Carvalho de Melo 238ff586298SGerrit Renker /* 239ff586298SGerrit Renker * Modify the cached value of X_recv [RFC 3448, 4.4] 240ff586298SGerrit Renker * 241ff586298SGerrit Renker * If (p == 0 || X_calc > 2 * X_recv) 2427c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2437c657876SArnaldo Carvalho de Melo * Else 2447c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2451a21e49aSGerrit Renker * 2461a21e49aSGerrit Renker * Note that X_recv is scaled by 2^6 while X_calc is not 2477c657876SArnaldo Carvalho de Melo */ 24844158306SGerrit Renker BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); 2497c657876SArnaldo Carvalho de Melo 25044158306SGerrit Renker if (hctx->ccid3hctx_p == 0 || 2518109b02bSArnaldo Carvalho de Melo (hctx->ccid3hctx_x_calc > 2528109b02bSArnaldo Carvalho de Melo (hctx->ccid3hctx_x_recv >> 5))) { 2531a21e49aSGerrit Renker 2541a21e49aSGerrit Renker hctx->ccid3hctx_x_recv = 2559e8efc82SGerrit Renker max(hctx->ccid3hctx_x_recv / 2, 2569e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2571a21e49aSGerrit Renker (2 * TFRC_T_MBI)); 2581a21e49aSGerrit Renker 259ff586298SGerrit Renker if (hctx->ccid3hctx_p == 0) 260ff586298SGerrit Renker dccp_timestamp(sk, &now); 2619e8efc82SGerrit Renker } else { 2629e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc; 2639e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 4; 2649e8efc82SGerrit Renker } 265ff586298SGerrit Renker /* Now recalculate X [RFC 3448, 4.3, step (4)] */ 266a79ef76fSGerrit Renker ccid3_hc_tx_update_x(sk, &now); 2677c657876SArnaldo Carvalho de Melo } 2686b5e633aSArnaldo Carvalho de Melo /* 2696b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2708a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 2718a508ac2SGerrit Renker * See comments in packet_recv() regarding the value of t_RTO. 2726b5e633aSArnaldo Carvalho de Melo */ 2738a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 2747c657876SArnaldo Carvalho de Melo break; 27559348b19SGerrit Renker case TFRC_SSTATE_NO_SENT: 276a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk), sk); 27759348b19SGerrit Renker /* fall through */ 27859348b19SGerrit Renker case TFRC_SSTATE_TERM: 2797c657876SArnaldo Carvalho de Melo goto out; 2807c657876SArnaldo Carvalho de Melo } 2817c657876SArnaldo Carvalho de Melo 2827c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 28348e03eeeSGerrit Renker 28448e03eeeSGerrit Renker restart_timer: 28548e03eeeSGerrit Renker sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2862a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 2877c657876SArnaldo Carvalho de Melo out: 2887c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2897c657876SArnaldo Carvalho de Melo sock_put(sk); 2907c657876SArnaldo Carvalho de Melo } 2917c657876SArnaldo Carvalho de Melo 2927da7f456SGerrit Renker /* 2937da7f456SGerrit Renker * returns 2947da7f456SGerrit Renker * > 0: delay (in msecs) that should pass before actually sending 2957da7f456SGerrit Renker * = 0: can send immediately 2967da7f456SGerrit Renker * < 0: error condition; do not send packet 2977da7f456SGerrit Renker */ 2986b57c93dSGerrit Renker static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) 2997c657876SArnaldo Carvalho de Melo { 3007c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 30159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3027c657876SArnaldo Carvalho de Melo struct timeval now; 3030f9e5b57SGerrit Renker suseconds_t delay; 3047c657876SArnaldo Carvalho de Melo 30559348b19SGerrit Renker BUG_ON(hctx == NULL); 3061f2333aeSArnaldo Carvalho de Melo 3077c657876SArnaldo Carvalho de Melo /* 308da335bafSGerrit Renker * This function is called only for Data and DataAck packets. Sending 309da335bafSGerrit Renker * zero-sized Data(Ack)s is theoretically possible, but for congestion 310da335bafSGerrit Renker * control this case is pathological - ignore it. 3117c657876SArnaldo Carvalho de Melo */ 3126b57c93dSGerrit Renker if (unlikely(skb->len == 0)) 313da335bafSGerrit Renker return -EBADMSG; 3147c657876SArnaldo Carvalho de Melo 315b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3167c657876SArnaldo Carvalho de Melo 3177c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3187c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3191f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3208109b02bSArnaldo Carvalho de Melo (jiffies + 3218109b02bSArnaldo Carvalho de Melo usecs_to_jiffies(TFRC_INITIAL_TIMEOUT))); 3227c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3237c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3247c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3257c657876SArnaldo Carvalho de Melo 3261a21e49aSGerrit Renker /* Set initial sending rate X/s to 1pps (X is scaled by 2^6) */ 3271266adeeSGerrit Renker hctx->ccid3hctx_x = hctx->ccid3hctx_s = skb->len; 3289e8efc82SGerrit Renker hctx->ccid3hctx_x <<= 6; 32978ad713dSGerrit Renker 33090feeb95SGerrit Renker /* First timeout, according to [RFC 3448, 4.2], is 1 second */ 33190feeb95SGerrit Renker hctx->ccid3hctx_t_ipi = USEC_PER_SEC; 33290feeb95SGerrit Renker /* Initial delta: minimum of 0.5 sec and t_gran/2 */ 33390feeb95SGerrit Renker hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; 33490feeb95SGerrit Renker 33590feeb95SGerrit Renker /* Set t_0 for initial packet */ 3367c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 3377c657876SArnaldo Carvalho de Melo break; 3387c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3397c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 34091cf5a17SGerrit Renker delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); 3418699be7dSIan McDonald ccid3_pr_debug("delay=%ld\n", (long)delay); 34291cf5a17SGerrit Renker /* 34391cf5a17SGerrit Renker * Scheduling of packet transmissions [RFC 3448, 4.6] 34491cf5a17SGerrit Renker * 34591cf5a17SGerrit Renker * if (t_now > t_nom - delta) 34691cf5a17SGerrit Renker * // send the packet now 34791cf5a17SGerrit Renker * else 34891cf5a17SGerrit Renker * // send the packet in (t_nom - t_now) milliseconds. 34991cf5a17SGerrit Renker */ 3500f9e5b57SGerrit Renker if (delay - (suseconds_t)hctx->ccid3hctx_delta >= 0) 3517da7f456SGerrit Renker return delay / 1000L; 3529f8681dbSGerrit Renker 3539f8681dbSGerrit Renker ccid3_hc_tx_update_win_count(hctx, &now); 3547c657876SArnaldo Carvalho de Melo break; 35559348b19SGerrit Renker case TFRC_SSTATE_TERM: 356a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 3577da7f456SGerrit Renker return -EINVAL; 3587c657876SArnaldo Carvalho de Melo } 3597c657876SArnaldo Carvalho de Melo 3607da7f456SGerrit Renker /* prepare to send now (add options etc.) */ 361507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 362e312d100SGerrit Renker DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 363e312d100SGerrit Renker 364e312d100SGerrit Renker /* set the nominal send time for the next following packet */ 3657da7f456SGerrit Renker timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); 3667da7f456SGerrit Renker 3677da7f456SGerrit Renker return 0; 3687c657876SArnaldo Carvalho de Melo } 3697c657876SArnaldo Carvalho de Melo 3708109b02bSArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, 3718109b02bSArnaldo Carvalho de Melo unsigned int len) 3727c657876SArnaldo Carvalho de Melo { 37359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3747c657876SArnaldo Carvalho de Melo struct timeval now; 3756b57c93dSGerrit Renker struct dccp_tx_hist_entry *packet; 3767c657876SArnaldo Carvalho de Melo 37759348b19SGerrit Renker BUG_ON(hctx == NULL); 3787c657876SArnaldo Carvalho de Melo 37978ad713dSGerrit Renker ccid3_hc_tx_update_s(hctx, len); 38078ad713dSGerrit Renker 381c5a1ae9aSGerrit Renker packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC); 38259d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 383c5a1ae9aSGerrit Renker DCCP_CRIT("packet history - out of memory!"); 3847c657876SArnaldo Carvalho de Melo return; 3857c657876SArnaldo Carvalho de Melo } 386c5a1ae9aSGerrit Renker dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, packet); 387c5a1ae9aSGerrit Renker 388c5a1ae9aSGerrit Renker dccp_timestamp(sk, &now); 3898c60f3faSArnaldo Carvalho de Melo packet->dccphtx_tstamp = now; 390c5a1ae9aSGerrit Renker packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss; 391c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 3928c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 393c5a1ae9aSGerrit Renker hctx->ccid3hctx_idle = 0; 3947c657876SArnaldo Carvalho de Melo } 3957c657876SArnaldo Carvalho de Melo 3967c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 3977c657876SArnaldo Carvalho de Melo { 39859725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 39959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 4007c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4018c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 402b0e56780SArnaldo Carvalho de Melo struct timeval now; 4032a1fda6fSGerrit Renker unsigned long t_nfb; 4047c657876SArnaldo Carvalho de Melo u32 pinv; 4051fba78b6SArnaldo Carvalho de Melo suseconds_t r_sample, t_elapsed; 4061f2333aeSArnaldo Carvalho de Melo 40759348b19SGerrit Renker BUG_ON(hctx == NULL); 4087c657876SArnaldo Carvalho de Melo 4097c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4107c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4117c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4127c657876SArnaldo Carvalho de Melo return; 4137c657876SArnaldo Carvalho de Melo 4147c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4157c657876SArnaldo Carvalho de Melo 4167c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4177c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4187c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4195c3fbb6aSGerrit Renker /* get packet from history to look up t_recvdata */ 4208c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4218c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 42259d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 4235c3fbb6aSGerrit Renker DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " 42459348b19SGerrit Renker "in history!\n", dccp_role(sk), sk, 42559d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4267c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4277c657876SArnaldo Carvalho de Melo return; 4287c657876SArnaldo Carvalho de Melo } 4297c657876SArnaldo Carvalho de Melo 4301a21e49aSGerrit Renker /* Update receive rate in units of 64 * bytes/second */ 4319e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; 4329e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 6; 4335c3fbb6aSGerrit Renker 4345c3fbb6aSGerrit Renker /* Update loss event rate */ 4355c3fbb6aSGerrit Renker pinv = opt_recv->ccid3or_loss_event_rate; 43645393a66SGerrit Renker if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ 4375c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 0; 43845393a66SGerrit Renker else /* can not exceed 100% */ 4395c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 1000000 / pinv; 4405c3fbb6aSGerrit Renker 441b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 4425c3fbb6aSGerrit Renker 4435c3fbb6aSGerrit Renker /* 4445c3fbb6aSGerrit Renker * Calculate new round trip sample as per [RFC 3448, 4.3] by 4455c3fbb6aSGerrit Renker * R_sample = (now - t_recvdata) - t_elapsed 4465c3fbb6aSGerrit Renker */ 447b0e56780SArnaldo Carvalho de Melo r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); 4485c3fbb6aSGerrit Renker t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; 4495c3fbb6aSGerrit Renker 4500f9e5b57SGerrit Renker DCCP_BUG_ON(r_sample < 0); 4510f9e5b57SGerrit Renker if (unlikely(r_sample <= t_elapsed)) 4521fba78b6SArnaldo Carvalho de Melo DCCP_WARN("WARNING: r_sample=%dus <= t_elapsed=%dus\n", 4531fba78b6SArnaldo Carvalho de Melo (int)r_sample, (int)t_elapsed); 4541a28599aSArnaldo Carvalho de Melo else 4551a28599aSArnaldo Carvalho de Melo r_sample -= t_elapsed; 456de553c18SGerrit Renker CCID3_RTT_SANITY_CHECK(r_sample); 4577c657876SArnaldo Carvalho de Melo 4587c657876SArnaldo Carvalho de Melo /* Update RTT estimate by 4597c657876SArnaldo Carvalho de Melo * If (No feedback recv) 4607c657876SArnaldo Carvalho de Melo * R = R_sample; 4617c657876SArnaldo Carvalho de Melo * Else 4627c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 4637c657876SArnaldo Carvalho de Melo * 4647c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 4657c657876SArnaldo Carvalho de Melo */ 4667c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 4671a21e49aSGerrit Renker /* 4681a21e49aSGerrit Renker * Larger Initial Windows [RFC 4342, sec. 5] 4691a21e49aSGerrit Renker */ 470371fe777SGerrit Renker __u32 w_init = min(4 * dp->dccps_mss_cache, 471371fe777SGerrit Renker max(2 * dp->dccps_mss_cache, 4380U)); 4727c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 4731a21e49aSGerrit Renker hctx->ccid3hctx_x = scaled_div(w_init << 6, r_sample); 474a79ef76fSGerrit Renker hctx->ccid3hctx_t_ld = now; 475a79ef76fSGerrit Renker 4761266adeeSGerrit Renker ccid3_update_send_interval(hctx); 4775c3fbb6aSGerrit Renker 478371fe777SGerrit Renker ccid3_pr_debug("%s(%p), s=%u, MSS=%u, w_init=%u, " 4791fba78b6SArnaldo Carvalho de Melo "R_sample=%dus, X=%u\n", dccp_role(sk), 4800f08461eSAndrew Morton sk, hctx->ccid3hctx_s, 481371fe777SGerrit Renker dp->dccps_mss_cache, 482371fe777SGerrit Renker w_init, 4838109b02bSArnaldo Carvalho de Melo (int)r_sample, 4841a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4855c3fbb6aSGerrit Renker 486a79ef76fSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 487a79ef76fSGerrit Renker } else { 4885c3fbb6aSGerrit Renker hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + 4895c3fbb6aSGerrit Renker (u32)r_sample) / 10; 4905c3fbb6aSGerrit Renker 491ff586298SGerrit Renker /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ 492ff586298SGerrit Renker if (hctx->ccid3hctx_p > 0) 493ff586298SGerrit Renker hctx->ccid3hctx_x_calc = 494ff586298SGerrit Renker tfrc_calc_x(hctx->ccid3hctx_s, 495ff586298SGerrit Renker hctx->ccid3hctx_rtt, 496ff586298SGerrit Renker hctx->ccid3hctx_p); 497a79ef76fSGerrit Renker ccid3_hc_tx_update_x(sk, &now); 4987c657876SArnaldo Carvalho de Melo 4991fba78b6SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p), RTT=%uus (sample=%dus), s=%u, " 5008109b02bSArnaldo Carvalho de Melo "p=%u, X_calc=%u, X_recv=%u, X=%u\n", 5018109b02bSArnaldo Carvalho de Melo dccp_role(sk), 5021fba78b6SArnaldo Carvalho de Melo sk, hctx->ccid3hctx_rtt, (int)r_sample, 5035c3fbb6aSGerrit Renker hctx->ccid3hctx_s, hctx->ccid3hctx_p, 5045c3fbb6aSGerrit Renker hctx->ccid3hctx_x_calc, 5059e8efc82SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6), 5061a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 5077c657876SArnaldo Carvalho de Melo } 5087c657876SArnaldo Carvalho de Melo 5097c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 5107c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5117c657876SArnaldo Carvalho de Melo 5127c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5138c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5148c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 515c530cfb1SArnaldo Carvalho de Melo /* 5168109b02bSArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible 5178109b02bSArnaldo Carvalho de Melo * that we now can send a packet, so wake up dccp_wait_for_ccid 518c530cfb1SArnaldo Carvalho de Melo */ 519c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5208c60f3faSArnaldo Carvalho de Melo 5218a508ac2SGerrit Renker /* 5228a508ac2SGerrit Renker * Update timeout interval for the nofeedback timer. 5238a508ac2SGerrit Renker * We use a configuration option to increase the lower bound. 5248109b02bSArnaldo Carvalho de Melo * This can help avoid triggering the nofeedback timer too 5258109b02bSArnaldo Carvalho de Melo * often ('spinning') on LANs with small RTTs. 5268a508ac2SGerrit Renker */ 5275d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 5288a508ac2SGerrit Renker CONFIG_IP_DCCP_CCID3_RTO * 5298a508ac2SGerrit Renker (USEC_PER_SEC/1000)); 5301f2333aeSArnaldo Carvalho de Melo /* 5311f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5328a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 5331f2333aeSArnaldo Carvalho de Melo */ 5348a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 5357c657876SArnaldo Carvalho de Melo 536a9672411SGerrit Renker ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " 5378109b02bSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5388109b02bSArnaldo Carvalho de Melo dccp_role(sk), 539a9672411SGerrit Renker sk, usecs_to_jiffies(t_nfb), t_nfb); 5407c657876SArnaldo Carvalho de Melo 5417c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5422a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 5437c657876SArnaldo Carvalho de Melo 5447c657876SArnaldo Carvalho de Melo /* set idle flag */ 5457c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5467c657876SArnaldo Carvalho de Melo break; 547151a9931SGerrit Renker case TFRC_SSTATE_NO_SENT: /* fall through */ 5485e19e3fcSGerrit Renker case TFRC_SSTATE_TERM: /* ignore feedback when closing */ 5497c657876SArnaldo Carvalho de Melo break; 5507c657876SArnaldo Carvalho de Melo } 5517c657876SArnaldo Carvalho de Melo } 5527c657876SArnaldo Carvalho de Melo 5537c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5541f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5551f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5567c657876SArnaldo Carvalho de Melo { 5577c657876SArnaldo Carvalho de Melo int rc = 0; 55859725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 55959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5607c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 5617c657876SArnaldo Carvalho de Melo 56259d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 5637c657876SArnaldo Carvalho de Melo 5647c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5657c657876SArnaldo Carvalho de Melo 5667c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5677c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5687c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5697c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5707c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5717c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5727c657876SArnaldo Carvalho de Melo } 5737c657876SArnaldo Carvalho de Melo 5747c657876SArnaldo Carvalho de Melo switch (option) { 5757c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 57659d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 577a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 57859348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 57959348b19SGerrit Renker dccp_role(sk), sk, len); 5807c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5817c657876SArnaldo Carvalho de Melo } else { 5828109b02bSArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = 5838109b02bSArnaldo Carvalho de Melo ntohl(*(__be32 *)value); 584a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", 5857c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5867c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 5877c657876SArnaldo Carvalho de Melo } 5887c657876SArnaldo Carvalho de Melo break; 5897c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 5907c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 5917c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 592a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n", 5937c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5947c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 5957c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 5967c657876SArnaldo Carvalho de Melo break; 5977c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 59859d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 599a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 60059348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 60159348b19SGerrit Renker dccp_role(sk), sk, len); 6027c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6037c657876SArnaldo Carvalho de Melo } else { 6048109b02bSArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 6058109b02bSArnaldo Carvalho de Melo ntohl(*(__be32 *)value); 606a9672411SGerrit Renker ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", 6077c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6087c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 6097c657876SArnaldo Carvalho de Melo } 6107c657876SArnaldo Carvalho de Melo break; 6117c657876SArnaldo Carvalho de Melo } 6127c657876SArnaldo Carvalho de Melo 6137c657876SArnaldo Carvalho de Melo return rc; 6147c657876SArnaldo Carvalho de Melo } 6157c657876SArnaldo Carvalho de Melo 61691f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 6177c657876SArnaldo Carvalho de Melo { 61891f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 6197c657876SArnaldo Carvalho de Melo 62078ad713dSGerrit Renker hctx->ccid3hctx_s = 0; 621fe0499aeSGerrit Renker hctx->ccid3hctx_rtt = 0; 6227c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6237c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 624aa5d7df3SArnaldo Carvalho de Melo 6258109b02bSArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = 6268109b02bSArnaldo Carvalho de Melo ccid3_hc_tx_no_feedback_timer; 627aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 6287c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6297c657876SArnaldo Carvalho de Melo 6307c657876SArnaldo Carvalho de Melo return 0; 6317c657876SArnaldo Carvalho de Melo } 6327c657876SArnaldo Carvalho de Melo 6337c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6347c657876SArnaldo Carvalho de Melo { 63559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6367c657876SArnaldo Carvalho de Melo 6377c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 6387c657876SArnaldo Carvalho de Melo 6397c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6407c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6417c657876SArnaldo Carvalho de Melo 6427c657876SArnaldo Carvalho de Melo /* Empty packet history */ 6438c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 6447c657876SArnaldo Carvalho de Melo } 6457c657876SArnaldo Carvalho de Melo 6469bf17475SGerrit Renker static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 6479bf17475SGerrit Renker { 6489bf17475SGerrit Renker const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6497c657876SArnaldo Carvalho de Melo 6509bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6519bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6529bf17475SGerrit Renker return; 6539bf17475SGerrit Renker 6549bf17475SGerrit Renker BUG_ON(hctx == NULL); 6559bf17475SGerrit Renker 6569bf17475SGerrit Renker info->tcpi_rto = hctx->ccid3hctx_t_rto; 6579bf17475SGerrit Renker info->tcpi_rtt = hctx->ccid3hctx_rtt; 6589bf17475SGerrit Renker } 6599bf17475SGerrit Renker 6609bf17475SGerrit Renker static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 6619bf17475SGerrit Renker u32 __user *optval, int __user *optlen) 6629bf17475SGerrit Renker { 6639bf17475SGerrit Renker const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6649bf17475SGerrit Renker const void *val; 6659bf17475SGerrit Renker 6669bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6679bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6689bf17475SGerrit Renker return -EINVAL; 6699bf17475SGerrit Renker 6709bf17475SGerrit Renker switch (optname) { 6719bf17475SGerrit Renker case DCCP_SOCKOPT_CCID_TX_INFO: 6729bf17475SGerrit Renker if (len < sizeof(hctx->ccid3hctx_tfrc)) 6739bf17475SGerrit Renker return -EINVAL; 6749bf17475SGerrit Renker len = sizeof(hctx->ccid3hctx_tfrc); 6759bf17475SGerrit Renker val = &hctx->ccid3hctx_tfrc; 6769bf17475SGerrit Renker break; 6779bf17475SGerrit Renker default: 6789bf17475SGerrit Renker return -ENOPROTOOPT; 6799bf17475SGerrit Renker } 6809bf17475SGerrit Renker 6819bf17475SGerrit Renker if (put_user(len, optlen) || copy_to_user(optval, val, len)) 6829bf17475SGerrit Renker return -EFAULT; 6839bf17475SGerrit Renker 6849bf17475SGerrit Renker return 0; 6859bf17475SGerrit Renker } 6869bf17475SGerrit Renker 6879bf17475SGerrit Renker /* 6889bf17475SGerrit Renker * Receiver Half-Connection Routines 6899bf17475SGerrit Renker */ 69056724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6917c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6927c657876SArnaldo Carvalho de Melo { 6937c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6947c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6957c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6967c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6977c657876SArnaldo Carvalho de Melo }; 6987c657876SArnaldo Carvalho de Melo 6997c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 7007c657876SArnaldo Carvalho de Melo } 7017c657876SArnaldo Carvalho de Melo #endif 7027c657876SArnaldo Carvalho de Melo 703c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 7041f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 7057c657876SArnaldo Carvalho de Melo { 70659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7077c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 7087c657876SArnaldo Carvalho de Melo 7097c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 7101f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 7111f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 7127c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 7137c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 7147c657876SArnaldo Carvalho de Melo } 7157c657876SArnaldo Carvalho de Melo 71678ad713dSGerrit Renker static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) 71778ad713dSGerrit Renker { 71878ad713dSGerrit Renker if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ 71978ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 72078ad713dSGerrit Renker else 72178ad713dSGerrit Renker hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : 72278ad713dSGerrit Renker (9 * hcrx->ccid3hcrx_s + len) / 10; 72378ad713dSGerrit Renker } 72478ad713dSGerrit Renker 7257c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 7267c657876SArnaldo Carvalho de Melo { 72759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7287c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 7298c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 730b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 7310f9e5b57SGerrit Renker suseconds_t delta; 7327c657876SArnaldo Carvalho de Melo 733a9672411SGerrit Renker ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk), sk); 7347c657876SArnaldo Carvalho de Melo 735b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 736b6ee3d4aSArnaldo Carvalho de Melo 7377c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 7387c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 7397c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 7407c657876SArnaldo Carvalho de Melo break; 7410f9e5b57SGerrit Renker case TFRC_RSTATE_DATA: 7420f9e5b57SGerrit Renker delta = timeval_delta(&now, 743b6ee3d4aSArnaldo Carvalho de Melo &hcrx->ccid3hcrx_tstamp_last_feedback); 7440f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 745b9039a2aSGerrit Renker hcrx->ccid3hcrx_x_recv = 746b9039a2aSGerrit Renker scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 7477c657876SArnaldo Carvalho de Melo break; 74859348b19SGerrit Renker case TFRC_RSTATE_TERM: 749a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 7507c657876SArnaldo Carvalho de Melo return; 7517c657876SArnaldo Carvalho de Melo } 7527c657876SArnaldo Carvalho de Melo 7538c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 75459d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 755a9672411SGerrit Renker DCCP_WARN("%s(%p), no data packet in history!\n", 75659348b19SGerrit Renker dccp_role(sk), sk); 7577c657876SArnaldo Carvalho de Melo return; 7587c657876SArnaldo Carvalho de Melo } 7597c657876SArnaldo Carvalho de Melo 760b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 76166a377c5SIan McDonald hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; 7627c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7637c657876SArnaldo Carvalho de Melo 7640f9e5b57SGerrit Renker /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */ 7650f9e5b57SGerrit Renker delta = timeval_delta(&now, &packet->dccphrx_tstamp); 7660f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 7670f9e5b57SGerrit Renker hcrx->ccid3hcrx_elapsed_time = delta / 10; 76845393a66SGerrit Renker 7697c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 77045393a66SGerrit Renker hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ 77145393a66SGerrit Renker else if (hcrx->ccid3hcrx_p > 1000000) { 77245393a66SGerrit Renker DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); 77345393a66SGerrit Renker hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ 77445393a66SGerrit Renker } else 7757c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 77645393a66SGerrit Renker 777507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7787c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7797c657876SArnaldo Carvalho de Melo } 7807c657876SArnaldo Carvalho de Melo 7812d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7827c657876SArnaldo Carvalho de Melo { 78359d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 78460fe62e7SAndrea Bittau __be32 x_recv, pinv; 7857c657876SArnaldo Carvalho de Melo 78659d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 78759d203f9SArnaldo Carvalho de Melo 78859d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7892d0817d1SArnaldo Carvalho de Melo return 0; 7907c657876SArnaldo Carvalho de Melo 79166a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 7924fded33bSArnaldo Carvalho de Melo 7934fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7942d0817d1SArnaldo Carvalho de Melo return 0; 7954fded33bSArnaldo Carvalho de Melo 7964fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7974fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7982d0817d1SArnaldo Carvalho de Melo 7992d0817d1SArnaldo Carvalho de Melo if ((hcrx->ccid3hcrx_elapsed_time != 0 && 8002d0817d1SArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 8012d0817d1SArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time)) || 8022d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb) || 8034fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 8042d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 8054fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 8062d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 8072d0817d1SArnaldo Carvalho de Melo return -1; 8082d0817d1SArnaldo Carvalho de Melo 8092d0817d1SArnaldo Carvalho de Melo return 0; 8107c657876SArnaldo Carvalho de Melo } 8117c657876SArnaldo Carvalho de Melo 8127c657876SArnaldo Carvalho de Melo /* calculate first loss interval 8137c657876SArnaldo Carvalho de Melo * 8147c657876SArnaldo Carvalho de Melo * returns estimated loss interval in usecs */ 8157c657876SArnaldo Carvalho de Melo 8167c657876SArnaldo Carvalho de Melo static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) 8177c657876SArnaldo Carvalho de Melo { 81859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 8198c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *entry, *next, *tail = NULL; 8200f9e5b57SGerrit Renker u32 x_recv, p; 8210f9e5b57SGerrit Renker suseconds_t rtt, delta; 822b6ee3d4aSArnaldo Carvalho de Melo struct timeval tstamp = { 0, }; 8237c657876SArnaldo Carvalho de Melo int interval = 0; 8247c657876SArnaldo Carvalho de Melo int win_count = 0; 8257c657876SArnaldo Carvalho de Melo int step = 0; 826bfe24a6cSGerrit Renker u64 fval; 8277c657876SArnaldo Carvalho de Melo 8288c60f3faSArnaldo Carvalho de Melo list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, 8298c60f3faSArnaldo Carvalho de Melo dccphrx_node) { 8308c60f3faSArnaldo Carvalho de Melo if (dccp_rx_hist_entry_data_packet(entry)) { 8317c657876SArnaldo Carvalho de Melo tail = entry; 8327c657876SArnaldo Carvalho de Melo 8337c657876SArnaldo Carvalho de Melo switch (step) { 8347c657876SArnaldo Carvalho de Melo case 0: 8358c60f3faSArnaldo Carvalho de Melo tstamp = entry->dccphrx_tstamp; 836c1734376SArnaldo Carvalho de Melo win_count = entry->dccphrx_ccval; 8377c657876SArnaldo Carvalho de Melo step = 1; 8387c657876SArnaldo Carvalho de Melo break; 8397c657876SArnaldo Carvalho de Melo case 1: 840c1734376SArnaldo Carvalho de Melo interval = win_count - entry->dccphrx_ccval; 8417c657876SArnaldo Carvalho de Melo if (interval < 0) 8427c657876SArnaldo Carvalho de Melo interval += TFRC_WIN_COUNT_LIMIT; 8437c657876SArnaldo Carvalho de Melo if (interval > 4) 8447c657876SArnaldo Carvalho de Melo goto found; 8457c657876SArnaldo Carvalho de Melo break; 8467c657876SArnaldo Carvalho de Melo } 8477c657876SArnaldo Carvalho de Melo } 8487c657876SArnaldo Carvalho de Melo } 8497c657876SArnaldo Carvalho de Melo 85059d203f9SArnaldo Carvalho de Melo if (unlikely(step == 0)) { 851a9672411SGerrit Renker DCCP_WARN("%s(%p), packet history has no data packets!\n", 85259348b19SGerrit Renker dccp_role(sk), sk); 8537c657876SArnaldo Carvalho de Melo return ~0; 8547c657876SArnaldo Carvalho de Melo } 8557c657876SArnaldo Carvalho de Melo 85659d203f9SArnaldo Carvalho de Melo if (unlikely(interval == 0)) { 857a9672411SGerrit Renker DCCP_WARN("%s(%p), Could not find a win_count interval > 0." 85859348b19SGerrit Renker "Defaulting to 1\n", dccp_role(sk), sk); 8597c657876SArnaldo Carvalho de Melo interval = 1; 8607c657876SArnaldo Carvalho de Melo } 8617c657876SArnaldo Carvalho de Melo found: 86266a377c5SIan McDonald if (!tail) { 86359348b19SGerrit Renker DCCP_CRIT("tail is null\n"); 86466a377c5SIan McDonald return ~0; 86566a377c5SIan McDonald } 8660f9e5b57SGerrit Renker 8670f9e5b57SGerrit Renker delta = timeval_delta(&tstamp, &tail->dccphrx_tstamp); 8680f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 8690f9e5b57SGerrit Renker 8700f9e5b57SGerrit Renker rtt = delta * 4 / interval; 8711fba78b6SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p), approximated RTT to %dus\n", 8721fba78b6SArnaldo Carvalho de Melo dccp_role(sk), sk, (int)rtt); 87359348b19SGerrit Renker 874bfe24a6cSGerrit Renker /* 875bfe24a6cSGerrit Renker * Determine the length of the first loss interval via inverse lookup. 876bfe24a6cSGerrit Renker * Assume that X_recv can be computed by the throughput equation 877bfe24a6cSGerrit Renker * s 878bfe24a6cSGerrit Renker * X_recv = -------- 879bfe24a6cSGerrit Renker * R * fval 880bfe24a6cSGerrit Renker * Find some p such that f(p) = fval; return 1/p [RFC 3448, 6.3.1]. 881bfe24a6cSGerrit Renker */ 882bfe24a6cSGerrit Renker if (rtt == 0) { /* would result in divide-by-zero */ 883832e3ca6SIan McDonald DCCP_WARN("RTT==0\n"); 884832e3ca6SIan McDonald return ~0; 88559348b19SGerrit Renker } 8867c657876SArnaldo Carvalho de Melo 887b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &tstamp); 888b0e56780SArnaldo Carvalho de Melo delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); 8890f9e5b57SGerrit Renker DCCP_BUG_ON(delta <= 0); 8907c657876SArnaldo Carvalho de Melo 8910f9e5b57SGerrit Renker x_recv = scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 892bfe24a6cSGerrit Renker if (x_recv == 0) { /* would also trigger divide-by-zero */ 893bfe24a6cSGerrit Renker DCCP_WARN("X_recv==0\n"); 894bfe24a6cSGerrit Renker if ((x_recv = hcrx->ccid3hcrx_x_recv) == 0) { 895bfe24a6cSGerrit Renker DCCP_BUG("stored value of X_recv is zero"); 896832e3ca6SIan McDonald return ~0; 897bfe24a6cSGerrit Renker } 89866a377c5SIan McDonald } 89966a377c5SIan McDonald 900bfe24a6cSGerrit Renker fval = scaled_div(hcrx->ccid3hcrx_s, rtt); 901bfe24a6cSGerrit Renker fval = scaled_div32(fval, x_recv); 90236729c1aSArnaldo Carvalho de Melo p = tfrc_calc_x_reverse_lookup(fval); 903bfe24a6cSGerrit Renker 904a9672411SGerrit Renker ccid3_pr_debug("%s(%p), receive rate=%u bytes/s, implied " 9051f2333aeSArnaldo Carvalho de Melo "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 9067c657876SArnaldo Carvalho de Melo 9077c657876SArnaldo Carvalho de Melo if (p == 0) 9087c657876SArnaldo Carvalho de Melo return ~0; 9097c657876SArnaldo Carvalho de Melo else 9107c657876SArnaldo Carvalho de Melo return 1000000 / p; 9117c657876SArnaldo Carvalho de Melo } 9127c657876SArnaldo Carvalho de Melo 9137c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) 9147c657876SArnaldo Carvalho de Melo { 91559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 916fc747e82SIan McDonald struct dccp_li_hist_entry *head; 91766a377c5SIan McDonald u64 seq_temp; 9187c657876SArnaldo Carvalho de Melo 91966a377c5SIan McDonald if (list_empty(&hcrx->ccid3hcrx_li_hist)) { 92066a377c5SIan McDonald if (!dccp_li_hist_interval_new(ccid3_li_hist, 92166a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) 922ae6706f0SArnaldo Carvalho de Melo return; 92366a377c5SIan McDonald 924fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 925fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 926fc747e82SIan McDonald head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); 92766a377c5SIan McDonald } else { 92866a377c5SIan McDonald struct dccp_li_hist_entry *entry; 92966a377c5SIan McDonald struct list_head *tail; 93066a377c5SIan McDonald 931fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 932fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 93366a377c5SIan McDonald /* FIXME win count check removed as was wrong */ 93466a377c5SIan McDonald /* should make this check with receive history */ 93566a377c5SIan McDonald /* and compare there as per section 10.2 of RFC4342 */ 93666a377c5SIan McDonald 93766a377c5SIan McDonald /* new loss event detected */ 93866a377c5SIan McDonald /* calculate last interval length */ 93966a377c5SIan McDonald seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); 94054e6ecb2SChristoph Lameter entry = dccp_li_hist_entry_new(ccid3_li_hist, GFP_ATOMIC); 94166a377c5SIan McDonald 94266a377c5SIan McDonald if (entry == NULL) { 94359348b19SGerrit Renker DCCP_BUG("out of memory - can not allocate entry"); 94466a377c5SIan McDonald return; 9457c657876SArnaldo Carvalho de Melo } 9467c657876SArnaldo Carvalho de Melo 94766a377c5SIan McDonald list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); 94866a377c5SIan McDonald 94966a377c5SIan McDonald tail = hcrx->ccid3hcrx_li_hist.prev; 95066a377c5SIan McDonald list_del(tail); 95166a377c5SIan McDonald kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); 95266a377c5SIan McDonald 95366a377c5SIan McDonald /* Create the newest interval */ 95466a377c5SIan McDonald entry->dccplih_seqno = seq_loss; 95566a377c5SIan McDonald entry->dccplih_interval = seq_temp; 95666a377c5SIan McDonald entry->dccplih_win_count = win_loss; 95766a377c5SIan McDonald } 95866a377c5SIan McDonald } 95966a377c5SIan McDonald 96066a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 96166a377c5SIan McDonald struct dccp_rx_hist_entry *packet) 9627c657876SArnaldo Carvalho de Melo { 96359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9648109b02bSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *rx_hist = 9658109b02bSArnaldo Carvalho de Melo dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); 96666a377c5SIan McDonald u64 seqno = packet->dccphrx_seqno; 96766a377c5SIan McDonald u64 tmp_seqno; 96866a377c5SIan McDonald int loss = 0; 96966a377c5SIan McDonald u8 ccval; 9707c657876SArnaldo Carvalho de Melo 97166a377c5SIan McDonald 97266a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 97366a377c5SIan McDonald 97466a377c5SIan McDonald if (!rx_hist || 97566a377c5SIan McDonald follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 97666a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 97766a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 97866a377c5SIan McDonald goto detect_out; 97966a377c5SIan McDonald } 98066a377c5SIan McDonald 98166a377c5SIan McDonald 98266a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 98366a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 98466a377c5SIan McDonald loss = 1; 98566a377c5SIan McDonald ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, 98666a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 98766a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 98866a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 98966a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 99066a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 99166a377c5SIan McDonald while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 99266a377c5SIan McDonald tmp_seqno, &ccval)) { 99366a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 99466a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 99566a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 99666a377c5SIan McDonald } 99766a377c5SIan McDonald } 99866a377c5SIan McDonald 99966a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 100066a377c5SIan McDonald /* but works at moment */ 100166a377c5SIan McDonald if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 100266a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 100366a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 100466a377c5SIan McDonald } 100566a377c5SIan McDonald 100666a377c5SIan McDonald detect_out: 100766a377c5SIan McDonald dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 100866a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 100966a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 101066a377c5SIan McDonald return loss; 10117c657876SArnaldo Carvalho de Melo } 10127c657876SArnaldo Carvalho de Melo 10137c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 10147c657876SArnaldo Carvalho de Melo { 101559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 10164fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 10178c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 10187c657876SArnaldo Carvalho de Melo struct timeval now; 10190f9e5b57SGerrit Renker u32 p_prev, rtt_prev; 10200f9e5b57SGerrit Renker suseconds_t r_sample, t_elapsed; 102178ad713dSGerrit Renker int loss, payload_size; 10221f2333aeSArnaldo Carvalho de Melo 102359348b19SGerrit Renker BUG_ON(hcrx == NULL); 10247c657876SArnaldo Carvalho de Melo 102559725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 10264fded33bSArnaldo Carvalho de Melo 10277c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 10287c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 10297c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 10307c657876SArnaldo Carvalho de Melo return; 10317c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 10324fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 10337c657876SArnaldo Carvalho de Melo break; 103466a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 1035b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 1036b3a3077dSArnaldo Carvalho de Melo timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); 1037b3a3077dSArnaldo Carvalho de Melo r_sample = timeval_usecs(&now); 1038b3a3077dSArnaldo Carvalho de Melo t_elapsed = opt_recv->dccpor_elapsed_time * 10; 1039b3a3077dSArnaldo Carvalho de Melo 10400f9e5b57SGerrit Renker DCCP_BUG_ON(r_sample < 0); 1041b3a3077dSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 10420f9e5b57SGerrit Renker DCCP_WARN("r_sample=%ldus, t_elapsed=%ldus\n", 10430f08461eSAndrew Morton (long)r_sample, (long)t_elapsed); 1044b3a3077dSArnaldo Carvalho de Melo else 1045b3a3077dSArnaldo Carvalho de Melo r_sample -= t_elapsed; 1046de553c18SGerrit Renker CCID3_RTT_SANITY_CHECK(r_sample); 1047b3a3077dSArnaldo Carvalho de Melo 1048b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 1049b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 1050b3a3077dSArnaldo Carvalho de Melo else 1051b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 1052b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 1053b3a3077dSArnaldo Carvalho de Melo 105466a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 1055a9672411SGerrit Renker ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n", 1056a9672411SGerrit Renker dccp_role(sk), sk, hcrx->ccid3hcrx_rtt, 10574fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 10587c657876SArnaldo Carvalho de Melo break; 10597c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 10607c657876SArnaldo Carvalho de Melo break; 106159d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 10627c657876SArnaldo Carvalho de Melo return; 10637c657876SArnaldo Carvalho de Melo } 10647c657876SArnaldo Carvalho de Melo 1065b0e56780SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, 106654e6ecb2SChristoph Lameter skb, GFP_ATOMIC); 106759d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 1068a9672411SGerrit Renker DCCP_WARN("%s(%p), Not enough mem to add rx packet " 106959348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 10707c657876SArnaldo Carvalho de Melo return; 10717c657876SArnaldo Carvalho de Melo } 10727c657876SArnaldo Carvalho de Melo 107366a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 10747c657876SArnaldo Carvalho de Melo 10757c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 10767c657876SArnaldo Carvalho de Melo return; 10777c657876SArnaldo Carvalho de Melo 107878ad713dSGerrit Renker payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; 107978ad713dSGerrit Renker ccid3_hc_rx_update_s(hcrx, payload_size); 108078ad713dSGerrit Renker 10817c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 10827c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 1083a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial " 1084a9672411SGerrit Renker "feedback\n", dccp_role(sk), sk, 10851f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 10867c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10877c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 10887c657876SArnaldo Carvalho de Melo return; 10897c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 109078ad713dSGerrit Renker hcrx->ccid3hcrx_bytes_recv += payload_size; 109166a377c5SIan McDonald if (loss) 1092b6ee3d4aSArnaldo Carvalho de Melo break; 1093b6ee3d4aSArnaldo Carvalho de Melo 1094b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 10958109b02bSArnaldo Carvalho de Melo if ((timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) - 10968109b02bSArnaldo Carvalho de Melo (suseconds_t)hcrx->ccid3hcrx_rtt) >= 0) { 1097b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 10987c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10997c657876SArnaldo Carvalho de Melo } 11007c657876SArnaldo Carvalho de Melo return; 110159348b19SGerrit Renker case TFRC_RSTATE_TERM: 1102a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 11037c657876SArnaldo Carvalho de Melo return; 11047c657876SArnaldo Carvalho de Melo } 11057c657876SArnaldo Carvalho de Melo 11067c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 1107a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n", 11084fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 11097c657876SArnaldo Carvalho de Melo 11107c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 11117c657876SArnaldo Carvalho de Melo 11127c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 1113c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 1114c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 1115c0996660SIan McDonald 11167c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 1117c0996660SIan McDonald if (i_mean != 0) 1118c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 111959348b19SGerrit Renker } else 112059348b19SGerrit Renker DCCP_BUG("empty loss history"); 11217c657876SArnaldo Carvalho de Melo 11227c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 11237c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 11247c657876SArnaldo Carvalho de Melo return; 11257c657876SArnaldo Carvalho de Melo } 11267c657876SArnaldo Carvalho de Melo } 11277c657876SArnaldo Carvalho de Melo 112891f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 11297c657876SArnaldo Carvalho de Melo { 113091f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 11317c657876SArnaldo Carvalho de Melo 1132a9672411SGerrit Renker ccid3_pr_debug("entry\n"); 11337c657876SArnaldo Carvalho de Melo 11347c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 11357c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 1136ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 1137b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); 1138954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; 113978ad713dSGerrit Renker hcrx->ccid3hcrx_s = 0; 1140fe0499aeSGerrit Renker hcrx->ccid3hcrx_rtt = 0; 11417c657876SArnaldo Carvalho de Melo return 0; 11427c657876SArnaldo Carvalho de Melo } 11437c657876SArnaldo Carvalho de Melo 11447c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 11457c657876SArnaldo Carvalho de Melo { 114659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 11477c657876SArnaldo Carvalho de Melo 114859d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 11497c657876SArnaldo Carvalho de Melo 11507c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 11517c657876SArnaldo Carvalho de Melo 11527c657876SArnaldo Carvalho de Melo /* Empty packet history */ 11538c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 11547c657876SArnaldo Carvalho de Melo 11557c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 1156ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); 11577c657876SArnaldo Carvalho de Melo } 11587c657876SArnaldo Carvalho de Melo 11592babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 11602babe1f6SArnaldo Carvalho de Melo { 116159725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 11622babe1f6SArnaldo Carvalho de Melo 116359c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 116459c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 116559c2353dSArnaldo Carvalho de Melo return; 116659c2353dSArnaldo Carvalho de Melo 116759d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 11682babe1f6SArnaldo Carvalho de Melo 11692babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 11702babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 11712babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 11722babe1f6SArnaldo Carvalho de Melo } 11732babe1f6SArnaldo Carvalho de Melo 117488f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 117588f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 117688f964dbSArnaldo Carvalho de Melo { 117788f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 117888f964dbSArnaldo Carvalho de Melo const void *val; 117988f964dbSArnaldo Carvalho de Melo 118088f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 118188f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 118288f964dbSArnaldo Carvalho de Melo return -EINVAL; 118388f964dbSArnaldo Carvalho de Melo 118488f964dbSArnaldo Carvalho de Melo switch (optname) { 118588f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 118688f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 118788f964dbSArnaldo Carvalho de Melo return -EINVAL; 118888f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 118988f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 119088f964dbSArnaldo Carvalho de Melo break; 119188f964dbSArnaldo Carvalho de Melo default: 119288f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 119388f964dbSArnaldo Carvalho de Melo } 119488f964dbSArnaldo Carvalho de Melo 119588f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 119688f964dbSArnaldo Carvalho de Melo return -EFAULT; 119788f964dbSArnaldo Carvalho de Melo 119888f964dbSArnaldo Carvalho de Melo return 0; 119988f964dbSArnaldo Carvalho de Melo } 120088f964dbSArnaldo Carvalho de Melo 120191f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 12023dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 12037c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 12047c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 120591f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 12067c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 12077c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 12087c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 12097c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 12107c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 12117c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 121291f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 12137c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 12147c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 12157c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 12167c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 12172babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 12182babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 121988f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 122088f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 12217c657876SArnaldo Carvalho de Melo }; 12227c657876SArnaldo Carvalho de Melo 122356724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 12247c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 12257c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 122656724aa4SGerrit Renker #endif 12277c657876SArnaldo Carvalho de Melo 12287c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 12297c657876SArnaldo Carvalho de Melo { 12308c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 12317c657876SArnaldo Carvalho de Melo 12328c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 12338c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 12347c657876SArnaldo Carvalho de Melo goto out; 12357c657876SArnaldo Carvalho de Melo 12368c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 12378c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 12388c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 12397c657876SArnaldo Carvalho de Melo 1240ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = dccp_li_hist_new("ccid3"); 1241ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist == NULL) 12428c60f3faSArnaldo Carvalho de Melo goto out_free_tx; 12437c657876SArnaldo Carvalho de Melo 12447c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 12457c657876SArnaldo Carvalho de Melo if (rc != 0) 12467c657876SArnaldo Carvalho de Melo goto out_free_loss_interval_history; 12477c657876SArnaldo Carvalho de Melo out: 12487c657876SArnaldo Carvalho de Melo return rc; 12498c60f3faSArnaldo Carvalho de Melo 12507c657876SArnaldo Carvalho de Melo out_free_loss_interval_history: 1251ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1252ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12538c60f3faSArnaldo Carvalho de Melo out_free_tx: 12548c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12558c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12568c60f3faSArnaldo Carvalho de Melo out_free_rx: 12578c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12588c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12597c657876SArnaldo Carvalho de Melo goto out; 12607c657876SArnaldo Carvalho de Melo } 12617c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 12627c657876SArnaldo Carvalho de Melo 12637c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 12647c657876SArnaldo Carvalho de Melo { 12657c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 12667c657876SArnaldo Carvalho de Melo 12678c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 12688c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12698c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12707c657876SArnaldo Carvalho de Melo } 12718c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 12728c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12738c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12747c657876SArnaldo Carvalho de Melo } 1275ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist != NULL) { 1276ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1277ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12787c657876SArnaldo Carvalho de Melo } 12797c657876SArnaldo Carvalho de Melo } 12807c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 12817c657876SArnaldo Carvalho de Melo 1282e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 12831f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 12847c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 12857c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 12867c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1287