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 446b5e633aSArnaldo Carvalho de Melo /* 450ba7a3baSArnaldo Carvalho de Melo * Reason for maths here is to avoid 32 bit overflow when a is big. 460ba7a3baSArnaldo Carvalho de Melo * With this we get close to the limit. 476b5e633aSArnaldo Carvalho de Melo */ 48c25a18baSArnaldo Carvalho de Melo static u32 usecs_div(const u32 a, const u32 b) 496b5e633aSArnaldo Carvalho de Melo { 500ba7a3baSArnaldo Carvalho de Melo const u32 div = a < (UINT_MAX / (USEC_PER_SEC / 10)) ? 10 : 510ba7a3baSArnaldo Carvalho de Melo a < (UINT_MAX / (USEC_PER_SEC / 50)) ? 50 : 520ba7a3baSArnaldo Carvalho de Melo a < (UINT_MAX / (USEC_PER_SEC / 100)) ? 100 : 530ba7a3baSArnaldo Carvalho de Melo a < (UINT_MAX / (USEC_PER_SEC / 500)) ? 500 : 540ba7a3baSArnaldo Carvalho de Melo a < (UINT_MAX / (USEC_PER_SEC / 1000)) ? 1000 : 550ba7a3baSArnaldo Carvalho de Melo a < (UINT_MAX / (USEC_PER_SEC / 5000)) ? 5000 : 560ba7a3baSArnaldo Carvalho de Melo a < (UINT_MAX / (USEC_PER_SEC / 10000)) ? 10000 : 570ba7a3baSArnaldo Carvalho de Melo a < (UINT_MAX / (USEC_PER_SEC / 50000)) ? 50000 : 580ba7a3baSArnaldo Carvalho de Melo 100000; 590ba7a3baSArnaldo Carvalho de Melo const u32 tmp = a * (USEC_PER_SEC / div); 600ba7a3baSArnaldo Carvalho de Melo return (b >= 2 * div) ? tmp / (b / div) : tmp; 616b5e633aSArnaldo Carvalho de Melo } 626b5e633aSArnaldo Carvalho de Melo 637c657876SArnaldo Carvalho de Melo 6456724aa4SGerrit Renker 6556724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6656724aa4SGerrit Renker static int ccid3_debug; 6756724aa4SGerrit Renker #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) 687c657876SArnaldo Carvalho de Melo #else 697c657876SArnaldo Carvalho de Melo #define ccid3_pr_debug(format, a...) 707c657876SArnaldo Carvalho de Melo #endif 717c657876SArnaldo Carvalho de Melo 72a1d3a355SArnaldo Carvalho de Melo static struct dccp_tx_hist *ccid3_tx_hist; 73a1d3a355SArnaldo Carvalho de Melo static struct dccp_rx_hist *ccid3_rx_hist; 74ae6706f0SArnaldo Carvalho de Melo static struct dccp_li_hist *ccid3_li_hist; 757c657876SArnaldo Carvalho de Melo 7656724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 777c657876SArnaldo Carvalho de Melo static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) 787c657876SArnaldo Carvalho de Melo { 797c657876SArnaldo Carvalho de Melo static char *ccid3_state_names[] = { 807c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_SENT] = "NO_SENT", 817c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", 827c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_FBACK] = "FBACK", 837c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_TERM] = "TERM", 847c657876SArnaldo Carvalho de Melo }; 857c657876SArnaldo Carvalho de Melo 867c657876SArnaldo Carvalho de Melo return ccid3_state_names[state]; 877c657876SArnaldo Carvalho de Melo } 887c657876SArnaldo Carvalho de Melo #endif 897c657876SArnaldo Carvalho de Melo 90c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_tx_set_state(struct sock *sk, 911f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_tx_states state) 927c657876SArnaldo Carvalho de Melo { 9359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 947c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; 957c657876SArnaldo Carvalho de Melo 967c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 971f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_tx_state_name(oldstate), 981f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(state)); 997c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 1007c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = state; 1017c657876SArnaldo Carvalho de Melo } 1027c657876SArnaldo Carvalho de Melo 10317893bc1SGerrit Renker /* 10417893bc1SGerrit Renker * Recalculate scheduled nominal send time t_nom, inter-packet interval 10517893bc1SGerrit Renker * t_ipi, and delta value. Should be called after each change to X. 10617893bc1SGerrit Renker */ 10717893bc1SGerrit Renker static inline void ccid3_update_send_time(struct ccid3_hc_tx_sock *hctx) 1087c657876SArnaldo Carvalho de Melo { 10917893bc1SGerrit Renker timeval_sub_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); 11017893bc1SGerrit Renker 11117893bc1SGerrit Renker /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */ 112f5c2d636SGerrit Renker hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_x); 11317893bc1SGerrit Renker 11417893bc1SGerrit Renker /* Update nominal send time with regard to the new t_ipi */ 11517893bc1SGerrit Renker timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); 1167c657876SArnaldo Carvalho de Melo 1177c657876SArnaldo Carvalho de Melo /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ 1181f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, 1191f2333aeSArnaldo Carvalho de Melo TFRC_OPSYS_HALF_TIME_GRAN); 1207c657876SArnaldo Carvalho de Melo } 1217c657876SArnaldo Carvalho de Melo /* 1227c657876SArnaldo Carvalho de Melo * Update X by 1237c657876SArnaldo Carvalho de Melo * If (p > 0) 1247c657876SArnaldo Carvalho de Melo * x_calc = calcX(s, R, p); 1257c657876SArnaldo Carvalho de Melo * X = max(min(X_calc, 2 * X_recv), s / t_mbi); 1267c657876SArnaldo Carvalho de Melo * Else 1277c657876SArnaldo Carvalho de Melo * If (now - tld >= R) 1287c657876SArnaldo Carvalho de Melo * X = max(min(2 * X, 2 * X_recv), s / R); 1297c657876SArnaldo Carvalho de Melo * tld = now; 1307c657876SArnaldo Carvalho de Melo */ 131a79ef76fSGerrit Renker static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now) 132a79ef76fSGerrit Renker 1337c657876SArnaldo Carvalho de Melo { 13459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 13517893bc1SGerrit Renker const __u32 old_x = hctx->ccid3hctx_x; 1367c657876SArnaldo Carvalho de Melo 1371f2333aeSArnaldo Carvalho de Melo /* To avoid large error in calcX */ 1381f2333aeSArnaldo Carvalho de Melo if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { 13936729c1aSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, 1407c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, 1417c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p); 142a79ef76fSGerrit Renker hctx->ccid3hctx_x = max_t(u32, min(hctx->ccid3hctx_x_calc, 143a79ef76fSGerrit Renker hctx->ccid3hctx_x_recv * 2), 144a79ef76fSGerrit Renker hctx->ccid3hctx_s / TFRC_T_MBI); 145b6ee3d4aSArnaldo Carvalho de Melo 146a79ef76fSGerrit Renker } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) >= 147b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt) { 148a79ef76fSGerrit Renker hctx->ccid3hctx_x = max(min(hctx->ccid3hctx_x_recv, 1496b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x ) * 2, 1506b5e633aSArnaldo Carvalho de Melo usecs_div(hctx->ccid3hctx_s, 1516b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt) ); 152a79ef76fSGerrit Renker hctx->ccid3hctx_t_ld = *now; 153a79ef76fSGerrit Renker } else 154a79ef76fSGerrit Renker ccid3_pr_debug("Not changing X\n"); 155a79ef76fSGerrit Renker 15617893bc1SGerrit Renker if (hctx->ccid3hctx_x != old_x) 15717893bc1SGerrit Renker ccid3_update_send_time(hctx); 1587c657876SArnaldo Carvalho de Melo } 1597c657876SArnaldo Carvalho de Melo 16078ad713dSGerrit Renker /* 16178ad713dSGerrit Renker * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) 16278ad713dSGerrit Renker * @len: DCCP packet payload size in bytes 16378ad713dSGerrit Renker */ 16478ad713dSGerrit Renker static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) 16578ad713dSGerrit Renker { 16678ad713dSGerrit Renker if (unlikely(len == 0)) 16778ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 16878ad713dSGerrit Renker else 16978ad713dSGerrit Renker hctx->ccid3hctx_s = hctx->ccid3hctx_s == 0 ? len : 17078ad713dSGerrit Renker (9 * hctx->ccid3hctx_s + len) / 10; 17178ad713dSGerrit Renker /* 17278ad713dSGerrit Renker * Note: We could do a potential optimisation here - when `s' changes, 17378ad713dSGerrit Renker * recalculate sending rate and consequently t_ipi, t_delta, and 17478ad713dSGerrit Renker * t_now. This is however non-standard, and the benefits are not 17578ad713dSGerrit Renker * clear, so it is currently left out. 17678ad713dSGerrit Renker */ 17778ad713dSGerrit Renker } 17878ad713dSGerrit Renker 1797c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 1807c657876SArnaldo Carvalho de Melo { 1817c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 18259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1832a1fda6fSGerrit Renker unsigned long t_nfb = USEC_PER_SEC / 5; 1847c657876SArnaldo Carvalho de Melo 1857c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 1867c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 1877c657876SArnaldo Carvalho de Melo /* Try again later. */ 1887c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 18948e03eeeSGerrit Renker goto restart_timer; 1907c657876SArnaldo Carvalho de Melo } 1917c657876SArnaldo Carvalho de Melo 1927c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, 1937c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 1947c657876SArnaldo Carvalho de Melo 1957c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 1967c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 197a79ef76fSGerrit Renker /* RFC 3448, 4.4: Halve send rate directly */ 198a79ef76fSGerrit Renker hctx->ccid3hctx_x = min_t(u32, hctx->ccid3hctx_x / 2, 199a79ef76fSGerrit Renker hctx->ccid3hctx_s / TFRC_T_MBI); 2007c657876SArnaldo Carvalho de Melo 2011f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " 2021f2333aeSArnaldo Carvalho de Melo "bytes/s\n", 2031f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2041f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 2057c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x); 20648e03eeeSGerrit Renker /* The value of R is still undefined and so we can not recompute 20748e03eeeSGerrit Renker * the timout value. Keep initial value as per [RFC 4342, 5]. */ 2082a1fda6fSGerrit Renker t_nfb = TFRC_INITIAL_TIMEOUT; 20917893bc1SGerrit Renker ccid3_update_send_time(hctx); 2107c657876SArnaldo Carvalho de Melo break; 2117c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 2121f2333aeSArnaldo Carvalho de Melo /* 2131f2333aeSArnaldo Carvalho de Melo * Check if IDLE since last timeout and recv rate is less than 2141f2333aeSArnaldo Carvalho de Melo * 4 packets per RTT 2151f2333aeSArnaldo Carvalho de Melo */ 2161f2333aeSArnaldo Carvalho de Melo if (!hctx->ccid3hctx_idle || 2176b5e633aSArnaldo Carvalho de Melo (hctx->ccid3hctx_x_recv >= 2186b5e633aSArnaldo Carvalho de Melo 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { 219a79ef76fSGerrit Renker struct timeval now; 220a79ef76fSGerrit Renker 2211f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", 2221f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2237c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2247c657876SArnaldo Carvalho de Melo /* Halve sending rate */ 2257c657876SArnaldo Carvalho de Melo 2267c657876SArnaldo Carvalho de Melo /* If (X_calc > 2 * X_recv) 2277c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2287c657876SArnaldo Carvalho de Melo * Else 2297c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2307c657876SArnaldo Carvalho de Melo */ 2311f2333aeSArnaldo Carvalho de Melo BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && 2321f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc == 0); 2337c657876SArnaldo Carvalho de Melo 2347c657876SArnaldo Carvalho de Melo /* check also if p is zero -> x_calc is infinity? */ 2357c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P || 2367c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) 2377c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, 238a79ef76fSGerrit Renker hctx->ccid3hctx_s / (2 * TFRC_T_MBI)); 2397c657876SArnaldo Carvalho de Melo else 2407c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; 2417c657876SArnaldo Carvalho de Melo 2427c657876SArnaldo Carvalho de Melo /* Update sending rate */ 243a79ef76fSGerrit Renker dccp_timestamp(sk, &now); 244a79ef76fSGerrit Renker ccid3_hc_tx_update_x(sk, &now); 2457c657876SArnaldo Carvalho de Melo } 2466b5e633aSArnaldo Carvalho de Melo /* 2476b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2482a1fda6fSGerrit Renker * max(4 * R, 2 * s/X) = max(4 * R, 2 * t_ipi) 2496b5e633aSArnaldo Carvalho de Melo */ 2502a1fda6fSGerrit Renker t_nfb = max(4 * hctx->ccid3hctx_rtt, 2 * hctx->ccid3hctx_t_ipi); 2517c657876SArnaldo Carvalho de Melo break; 25259348b19SGerrit Renker case TFRC_SSTATE_NO_SENT: 25359348b19SGerrit Renker DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); 25459348b19SGerrit Renker /* fall through */ 25559348b19SGerrit Renker case TFRC_SSTATE_TERM: 2567c657876SArnaldo Carvalho de Melo goto out; 2577c657876SArnaldo Carvalho de Melo } 2587c657876SArnaldo Carvalho de Melo 2597c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 26048e03eeeSGerrit Renker 26148e03eeeSGerrit Renker restart_timer: 26248e03eeeSGerrit Renker sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2632a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 2647c657876SArnaldo Carvalho de Melo out: 2657c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2667c657876SArnaldo Carvalho de Melo sock_put(sk); 2677c657876SArnaldo Carvalho de Melo } 2687c657876SArnaldo Carvalho de Melo 2697da7f456SGerrit Renker /* 2707da7f456SGerrit Renker * returns 2717da7f456SGerrit Renker * > 0: delay (in msecs) that should pass before actually sending 2727da7f456SGerrit Renker * = 0: can send immediately 2737da7f456SGerrit Renker * < 0: error condition; do not send packet 2747da7f456SGerrit Renker */ 2756b57c93dSGerrit Renker static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) 2767c657876SArnaldo Carvalho de Melo { 2777c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 27859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2798c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *new_packet; 2807c657876SArnaldo Carvalho de Melo struct timeval now; 28127258ee5SArnaldo Carvalho de Melo long delay; 2827c657876SArnaldo Carvalho de Melo 28359348b19SGerrit Renker BUG_ON(hctx == NULL); 2841f2333aeSArnaldo Carvalho de Melo 2857c657876SArnaldo Carvalho de Melo /* 286da335bafSGerrit Renker * This function is called only for Data and DataAck packets. Sending 287da335bafSGerrit Renker * zero-sized Data(Ack)s is theoretically possible, but for congestion 288da335bafSGerrit Renker * control this case is pathological - ignore it. 2897c657876SArnaldo Carvalho de Melo */ 2906b57c93dSGerrit Renker if (unlikely(skb->len == 0)) 291da335bafSGerrit Renker return -EBADMSG; 2927c657876SArnaldo Carvalho de Melo 2937c657876SArnaldo Carvalho de Melo /* See if last packet allocated was not sent */ 2948c60f3faSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 2958c60f3faSArnaldo Carvalho de Melo if (new_packet == NULL || new_packet->dccphtx_sent) { 2961f2333aeSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, 2971f2333aeSArnaldo Carvalho de Melo SLAB_ATOMIC); 2987c657876SArnaldo Carvalho de Melo 29959d203f9SArnaldo Carvalho de Melo if (unlikely(new_packet == NULL)) { 30059348b19SGerrit Renker DCCP_WARN("%s, sk=%p, not enough mem to add to history," 30159348b19SGerrit Renker "send refused\n", dccp_role(sk), sk); 3027da7f456SGerrit Renker return -ENOBUFS; 3037c657876SArnaldo Carvalho de Melo } 3047c657876SArnaldo Carvalho de Melo 3058c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); 3067c657876SArnaldo Carvalho de Melo } 3077c657876SArnaldo Carvalho de Melo 308b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3097c657876SArnaldo Carvalho de Melo 3107c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3117c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3121f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3131f2333aeSArnaldo Carvalho de Melo jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); 3147c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3157c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3167c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3177c657876SArnaldo Carvalho de Melo 31878ad713dSGerrit Renker /* Set initial sending rate to 1 packet per second */ 3196b57c93dSGerrit Renker ccid3_hc_tx_update_s(hctx, skb->len); 32078ad713dSGerrit Renker hctx->ccid3hctx_x = hctx->ccid3hctx_s; 32178ad713dSGerrit Renker 32290feeb95SGerrit Renker /* First timeout, according to [RFC 3448, 4.2], is 1 second */ 32390feeb95SGerrit Renker hctx->ccid3hctx_t_ipi = USEC_PER_SEC; 32490feeb95SGerrit Renker /* Initial delta: minimum of 0.5 sec and t_gran/2 */ 32590feeb95SGerrit Renker hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; 32690feeb95SGerrit Renker 32790feeb95SGerrit Renker /* Set t_0 for initial packet */ 3287c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 3297c657876SArnaldo Carvalho de Melo break; 3307c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3317c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 33291cf5a17SGerrit Renker delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); 33391cf5a17SGerrit Renker /* 33491cf5a17SGerrit Renker * Scheduling of packet transmissions [RFC 3448, 4.6] 33591cf5a17SGerrit Renker * 33691cf5a17SGerrit Renker * if (t_now > t_nom - delta) 33791cf5a17SGerrit Renker * // send the packet now 33891cf5a17SGerrit Renker * else 33991cf5a17SGerrit Renker * // send the packet in (t_nom - t_now) milliseconds. 34091cf5a17SGerrit Renker */ 3417da7f456SGerrit Renker if (delay >= hctx->ccid3hctx_delta) 3427da7f456SGerrit Renker return delay / 1000L; 3437c657876SArnaldo Carvalho de Melo break; 34459348b19SGerrit Renker case TFRC_SSTATE_TERM: 34559348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 3467da7f456SGerrit Renker return -EINVAL; 3477c657876SArnaldo Carvalho de Melo } 3487c657876SArnaldo Carvalho de Melo 3497da7f456SGerrit Renker /* prepare to send now (add options etc.) */ 350507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 3517da7f456SGerrit Renker new_packet->dccphtx_ccval = DCCP_SKB_CB(skb)->dccpd_ccval = 3528c60f3faSArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count; 3537da7f456SGerrit Renker timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); 3547da7f456SGerrit Renker 3557da7f456SGerrit Renker return 0; 3567c657876SArnaldo Carvalho de Melo } 3577c657876SArnaldo Carvalho de Melo 3586b57c93dSGerrit Renker static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len) 3597c657876SArnaldo Carvalho de Melo { 36059725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 36159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3627c657876SArnaldo Carvalho de Melo struct timeval now; 3636b57c93dSGerrit Renker unsigned long quarter_rtt; 3646b57c93dSGerrit Renker struct dccp_tx_hist_entry *packet; 3657c657876SArnaldo Carvalho de Melo 36659348b19SGerrit Renker BUG_ON(hctx == NULL); 3677c657876SArnaldo Carvalho de Melo 368b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3697c657876SArnaldo Carvalho de Melo 37078ad713dSGerrit Renker ccid3_hc_tx_update_s(hctx, len); 37178ad713dSGerrit Renker 3728c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 37359d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 37459348b19SGerrit Renker DCCP_WARN("packet doesn't exist in history!\n"); 3757c657876SArnaldo Carvalho de Melo return; 3767c657876SArnaldo Carvalho de Melo } 37759d203f9SArnaldo Carvalho de Melo if (unlikely(packet->dccphtx_sent)) { 37859348b19SGerrit Renker DCCP_WARN("no unsent packet in history!\n"); 3797c657876SArnaldo Carvalho de Melo return; 3807c657876SArnaldo Carvalho de Melo } 3818c60f3faSArnaldo Carvalho de Melo packet->dccphtx_tstamp = now; 3828c60f3faSArnaldo Carvalho de Melo packet->dccphtx_seqno = dp->dccps_gss; 3837c657876SArnaldo Carvalho de Melo /* 3841f2333aeSArnaldo Carvalho de Melo * Check if win_count have changed 3850e64e94eSGerrit Renker * Algorithm in "8.1. Window Counter Value" in RFC 4342. 3867c657876SArnaldo Carvalho de Melo */ 3876b5e633aSArnaldo Carvalho de Melo quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); 3886b5e633aSArnaldo Carvalho de Melo if (likely(hctx->ccid3hctx_rtt > 8)) 3896b5e633aSArnaldo Carvalho de Melo quarter_rtt /= hctx->ccid3hctx_rtt / 4; 3906b5e633aSArnaldo Carvalho de Melo 3917c657876SArnaldo Carvalho de Melo if (quarter_rtt > 0) { 3927c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3937c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + 3947c657876SArnaldo Carvalho de Melo min_t(unsigned long, quarter_rtt, 5)) % 16; 3951f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, window changed from " 3961f2333aeSArnaldo Carvalho de Melo "%u to %u!\n", 3977c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 398c1734376SArnaldo Carvalho de Melo packet->dccphtx_ccval, 3997c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count); 4007c657876SArnaldo Carvalho de Melo } 4011f2333aeSArnaldo Carvalho de Melo 4027c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 0; 403c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 4048c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 4057c657876SArnaldo Carvalho de Melo } 4067c657876SArnaldo Carvalho de Melo 4077c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 4087c657876SArnaldo Carvalho de Melo { 40959725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 41059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 4117c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4128c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 413b0e56780SArnaldo Carvalho de Melo struct timeval now; 4142a1fda6fSGerrit Renker unsigned long t_nfb; 4151bc09869SIan McDonald u32 t_elapsed; 4167c657876SArnaldo Carvalho de Melo u32 pinv; 4177c657876SArnaldo Carvalho de Melo u32 x_recv; 4187c657876SArnaldo Carvalho de Melo u32 r_sample; 4191f2333aeSArnaldo Carvalho de Melo 42059348b19SGerrit Renker BUG_ON(hctx == NULL); 4217c657876SArnaldo Carvalho de Melo 4227c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4237c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4247c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4257c657876SArnaldo Carvalho de Melo return; 4267c657876SArnaldo Carvalho de Melo 4277c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4287c657876SArnaldo Carvalho de Melo 4291a28599aSArnaldo Carvalho de Melo t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; 4307c657876SArnaldo Carvalho de Melo x_recv = opt_recv->ccid3or_receive_rate; 4317c657876SArnaldo Carvalho de Melo pinv = opt_recv->ccid3or_loss_event_rate; 4327c657876SArnaldo Carvalho de Melo 4337c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4347c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4357c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4367c657876SArnaldo Carvalho de Melo /* Calculate new round trip sample by 4377c657876SArnaldo Carvalho de Melo * R_sample = (now - t_recvdata) - t_delay */ 4387c657876SArnaldo Carvalho de Melo /* get t_recvdata from history */ 4398c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4408c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 44159d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 44259348b19SGerrit Renker DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist " 44359348b19SGerrit Renker "in history!\n", dccp_role(sk), sk, 44459d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4457c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4467c657876SArnaldo Carvalho de Melo return; 4477c657876SArnaldo Carvalho de Melo } 4487c657876SArnaldo Carvalho de Melo 4497c657876SArnaldo Carvalho de Melo /* Update RTT */ 450b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 451b0e56780SArnaldo Carvalho de Melo r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); 4521a28599aSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 45359348b19SGerrit Renker DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n", 45459348b19SGerrit Renker r_sample, t_elapsed); 4551a28599aSArnaldo Carvalho de Melo else 4561a28599aSArnaldo Carvalho de Melo r_sample -= t_elapsed; 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) { 467a79ef76fSGerrit Renker /* Use Larger Initial Windows [RFC 4342, sec. 5] 468a79ef76fSGerrit Renker * We deviate in that we use `s' instead of `MSS'. */ 469a79ef76fSGerrit Renker u16 w_init = max( 4 * hctx->ccid3hctx_s, 470a79ef76fSGerrit Renker max(2 * hctx->ccid3hctx_s, 4380)); 4717c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 472a79ef76fSGerrit Renker hctx->ccid3hctx_x = usecs_div(w_init, r_sample); 473a79ef76fSGerrit Renker hctx->ccid3hctx_t_ld = now; 474a79ef76fSGerrit Renker 475a79ef76fSGerrit Renker ccid3_update_send_time(hctx); 476a79ef76fSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 477a79ef76fSGerrit Renker } else { 4781f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + 4791f2333aeSArnaldo Carvalho de Melo r_sample / 10; 480a79ef76fSGerrit Renker ccid3_hc_tx_update_x(sk, &now); 481a79ef76fSGerrit Renker } 4827c657876SArnaldo Carvalho de Melo 4831f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " 4841f2333aeSArnaldo Carvalho de Melo "r_sample=%us\n", dccp_role(sk), sk, 4851f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, r_sample); 4867c657876SArnaldo Carvalho de Melo 4877c657876SArnaldo Carvalho de Melo /* Update receive rate */ 4881f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ 4897c657876SArnaldo Carvalho de Melo 4907c657876SArnaldo Carvalho de Melo /* Update loss event rate */ 4917c657876SArnaldo Carvalho de Melo if (pinv == ~0 || pinv == 0) 4927c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 0; 4937c657876SArnaldo Carvalho de Melo else { 4947c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 1000000 / pinv; 4957c657876SArnaldo Carvalho de Melo 4967c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { 4977c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = TFRC_SMALLEST_P; 4981f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", 4991f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk); 5007c657876SArnaldo Carvalho de Melo } 5017c657876SArnaldo Carvalho de Melo } 5027c657876SArnaldo Carvalho de Melo 5037c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 5047c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5057c657876SArnaldo Carvalho de Melo 5067c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5078c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5088c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 509c530cfb1SArnaldo Carvalho de Melo /* 510c530cfb1SArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible that 5115d0dbc4aSGerrit Renker * we now can send a packet, so wake up dccp_wait_for_ccid 512c530cfb1SArnaldo Carvalho de Melo */ 513c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5148c60f3faSArnaldo Carvalho de Melo 5155d0dbc4aSGerrit Renker /* Update timeout interval. We use the alternative variant of 5165d0dbc4aSGerrit Renker * [RFC 3448, 3.1] which sets the upper bound of t_rto to one 5175d0dbc4aSGerrit Renker * second, as it is suggested for TCP (see RFC 2988, 2.4). */ 5185d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 5195d0dbc4aSGerrit Renker USEC_PER_SEC ); 5201f2333aeSArnaldo Carvalho de Melo /* 5211f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5222a1fda6fSGerrit Renker * max(4 * R, 2 * s/X) = max(4 * R, 2 * t_ipi) 5231f2333aeSArnaldo Carvalho de Melo */ 5242a1fda6fSGerrit Renker t_nfb = max(4 * hctx->ccid3hctx_rtt, 2 * hctx->ccid3hctx_t_ipi); 5257c657876SArnaldo Carvalho de Melo 5261f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " 5271f2333aeSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5281f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 5292a1fda6fSGerrit Renker usecs_to_jiffies(t_nfb), t_nfb); 5307c657876SArnaldo Carvalho de Melo 5317c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5322a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 5337c657876SArnaldo Carvalho de Melo 5347c657876SArnaldo Carvalho de Melo /* set idle flag */ 5357c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5367c657876SArnaldo Carvalho de Melo break; 5375e19e3fcSGerrit Renker case TFRC_SSTATE_NO_SENT: 5385e19e3fcSGerrit Renker DCCP_WARN("Illegal ACK received - no packet has been 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 5452d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) 5467c657876SArnaldo Carvalho de Melo { 54759d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5487c657876SArnaldo Carvalho de Melo 54959d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 55059d203f9SArnaldo Carvalho de Melo 5512d0817d1SArnaldo Carvalho de Melo if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) 5527c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 5532d0817d1SArnaldo Carvalho de Melo return 0; 5547c657876SArnaldo Carvalho de Melo } 5557c657876SArnaldo Carvalho de Melo 5567c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5571f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5581f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5597c657876SArnaldo Carvalho de Melo { 5607c657876SArnaldo Carvalho de Melo int rc = 0; 56159725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 56259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5637c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 5647c657876SArnaldo Carvalho de Melo 56559d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 5667c657876SArnaldo Carvalho de Melo 5677c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5687c657876SArnaldo Carvalho de Melo 5697c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5707c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5717c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5727c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5737c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5747c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5757c657876SArnaldo Carvalho de Melo } 5767c657876SArnaldo Carvalho de Melo 5777c657876SArnaldo Carvalho de Melo switch (option) { 5787c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 57959d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 58059348b19SGerrit Renker DCCP_WARN("%s, sk=%p, invalid len %d " 58159348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 58259348b19SGerrit Renker dccp_role(sk), sk, len); 5837c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5847c657876SArnaldo Carvalho de Melo } else { 58560fe62e7SAndrea Bittau opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); 5867c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", 5877c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5887c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 5897c657876SArnaldo Carvalho de Melo } 5907c657876SArnaldo Carvalho de Melo break; 5917c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 5927c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 5937c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 5947c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", 5957c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5967c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 5977c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 5987c657876SArnaldo Carvalho de Melo break; 5997c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 60059d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 60159348b19SGerrit Renker DCCP_WARN("%s, sk=%p, invalid len %d " 60259348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 60359348b19SGerrit Renker dccp_role(sk), sk, len); 6047c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6057c657876SArnaldo Carvalho de Melo } else { 60660fe62e7SAndrea Bittau opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); 6077c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", 6087c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6097c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 6107c657876SArnaldo Carvalho de Melo } 6117c657876SArnaldo Carvalho de Melo break; 6127c657876SArnaldo Carvalho de Melo } 6137c657876SArnaldo Carvalho de Melo 6147c657876SArnaldo Carvalho de Melo return rc; 6157c657876SArnaldo Carvalho de Melo } 6167c657876SArnaldo Carvalho de Melo 61791f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 6187c657876SArnaldo Carvalho de Melo { 61991f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 6207c657876SArnaldo Carvalho de Melo 62178ad713dSGerrit Renker hctx->ccid3hctx_s = 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 625aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; 626aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 6277c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6287c657876SArnaldo Carvalho de Melo 6297c657876SArnaldo Carvalho de Melo return 0; 6307c657876SArnaldo Carvalho de Melo } 6317c657876SArnaldo Carvalho de Melo 6327c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6337c657876SArnaldo Carvalho de Melo { 63459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6357c657876SArnaldo Carvalho de Melo 6367c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 6377c657876SArnaldo Carvalho de Melo 6387c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6397c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6407c657876SArnaldo Carvalho de Melo 6417c657876SArnaldo Carvalho de Melo /* Empty packet history */ 6428c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 6437c657876SArnaldo Carvalho de Melo } 6447c657876SArnaldo Carvalho de Melo 6457c657876SArnaldo Carvalho de Melo /* 6467c657876SArnaldo Carvalho de Melo * RX Half Connection methods 6477c657876SArnaldo Carvalho de Melo */ 6487c657876SArnaldo Carvalho de Melo 64956724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6507c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6517c657876SArnaldo Carvalho de Melo { 6527c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6537c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6547c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6557c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6567c657876SArnaldo Carvalho de Melo }; 6577c657876SArnaldo Carvalho de Melo 6587c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6597c657876SArnaldo Carvalho de Melo } 6607c657876SArnaldo Carvalho de Melo #endif 6617c657876SArnaldo Carvalho de Melo 662c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 6631f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 6647c657876SArnaldo Carvalho de Melo { 66559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6667c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 6677c657876SArnaldo Carvalho de Melo 6687c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 6691f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 6701f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 6717c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 6727c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 6737c657876SArnaldo Carvalho de Melo } 6747c657876SArnaldo Carvalho de Melo 67578ad713dSGerrit Renker static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) 67678ad713dSGerrit Renker { 67778ad713dSGerrit Renker if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ 67878ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 67978ad713dSGerrit Renker else 68078ad713dSGerrit Renker hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : 68178ad713dSGerrit Renker (9 * hcrx->ccid3hcrx_s + len) / 10; 68278ad713dSGerrit Renker } 68378ad713dSGerrit Renker 6847c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 6857c657876SArnaldo Carvalho de Melo { 68659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6877c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 6888c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 689b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 6907c657876SArnaldo Carvalho de Melo 6917c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 6927c657876SArnaldo Carvalho de Melo 693b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 694b6ee3d4aSArnaldo Carvalho de Melo 6957c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 6967c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 6977c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 6987c657876SArnaldo Carvalho de Melo break; 6997c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: { 700b6ee3d4aSArnaldo Carvalho de Melo const u32 delta = timeval_delta(&now, 701b6ee3d4aSArnaldo Carvalho de Melo &hcrx->ccid3hcrx_tstamp_last_feedback); 70227ae543eSArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, 70327ae543eSArnaldo Carvalho de Melo delta); 7047c657876SArnaldo Carvalho de Melo } 7057c657876SArnaldo Carvalho de Melo break; 70659348b19SGerrit Renker case TFRC_RSTATE_TERM: 70759348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 7087c657876SArnaldo Carvalho de Melo return; 7097c657876SArnaldo Carvalho de Melo } 7107c657876SArnaldo Carvalho de Melo 7118c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 71259d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 71359348b19SGerrit Renker DCCP_WARN("%s, sk=%p, no data packet in history!\n", 71459348b19SGerrit Renker dccp_role(sk), sk); 7157c657876SArnaldo Carvalho de Melo return; 7167c657876SArnaldo Carvalho de Melo } 7177c657876SArnaldo Carvalho de Melo 718b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 71966a377c5SIan McDonald hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; 7207c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7217c657876SArnaldo Carvalho de Melo 7227c657876SArnaldo Carvalho de Melo /* Convert to multiples of 10us */ 723b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time = 724b6ee3d4aSArnaldo Carvalho de Melo timeval_delta(&now, &packet->dccphrx_tstamp) / 10; 7257c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 7267c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = ~0; 7277c657876SArnaldo Carvalho de Melo else 7287c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 729507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7307c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7317c657876SArnaldo Carvalho de Melo } 7327c657876SArnaldo Carvalho de Melo 7332d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7347c657876SArnaldo Carvalho de Melo { 73559d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 73660fe62e7SAndrea Bittau __be32 x_recv, pinv; 7377c657876SArnaldo Carvalho de Melo 73859d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 73959d203f9SArnaldo Carvalho de Melo 74059d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7412d0817d1SArnaldo Carvalho de Melo return 0; 7427c657876SArnaldo Carvalho de Melo 74366a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 7444fded33bSArnaldo Carvalho de Melo 7454fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7462d0817d1SArnaldo Carvalho de Melo return 0; 7474fded33bSArnaldo Carvalho de Melo 7484fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7494fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7502d0817d1SArnaldo Carvalho de Melo 7512d0817d1SArnaldo Carvalho de Melo if ((hcrx->ccid3hcrx_elapsed_time != 0 && 7522d0817d1SArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 7532d0817d1SArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time)) || 7542d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb) || 7554fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7562d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7574fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 7582d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 7592d0817d1SArnaldo Carvalho de Melo return -1; 7602d0817d1SArnaldo Carvalho de Melo 7612d0817d1SArnaldo Carvalho de Melo return 0; 7627c657876SArnaldo Carvalho de Melo } 7637c657876SArnaldo Carvalho de Melo 7647c657876SArnaldo Carvalho de Melo /* calculate first loss interval 7657c657876SArnaldo Carvalho de Melo * 7667c657876SArnaldo Carvalho de Melo * returns estimated loss interval in usecs */ 7677c657876SArnaldo Carvalho de Melo 7687c657876SArnaldo Carvalho de Melo static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) 7697c657876SArnaldo Carvalho de Melo { 77059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7718c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *entry, *next, *tail = NULL; 7727c657876SArnaldo Carvalho de Melo u32 rtt, delta, x_recv, fval, p, tmp2; 773b6ee3d4aSArnaldo Carvalho de Melo struct timeval tstamp = { 0, }; 7747c657876SArnaldo Carvalho de Melo int interval = 0; 7757c657876SArnaldo Carvalho de Melo int win_count = 0; 7767c657876SArnaldo Carvalho de Melo int step = 0; 7777c657876SArnaldo Carvalho de Melo u64 tmp1; 7787c657876SArnaldo Carvalho de Melo 7798c60f3faSArnaldo Carvalho de Melo list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, 7808c60f3faSArnaldo Carvalho de Melo dccphrx_node) { 7818c60f3faSArnaldo Carvalho de Melo if (dccp_rx_hist_entry_data_packet(entry)) { 7827c657876SArnaldo Carvalho de Melo tail = entry; 7837c657876SArnaldo Carvalho de Melo 7847c657876SArnaldo Carvalho de Melo switch (step) { 7857c657876SArnaldo Carvalho de Melo case 0: 7868c60f3faSArnaldo Carvalho de Melo tstamp = entry->dccphrx_tstamp; 787c1734376SArnaldo Carvalho de Melo win_count = entry->dccphrx_ccval; 7887c657876SArnaldo Carvalho de Melo step = 1; 7897c657876SArnaldo Carvalho de Melo break; 7907c657876SArnaldo Carvalho de Melo case 1: 791c1734376SArnaldo Carvalho de Melo interval = win_count - entry->dccphrx_ccval; 7927c657876SArnaldo Carvalho de Melo if (interval < 0) 7937c657876SArnaldo Carvalho de Melo interval += TFRC_WIN_COUNT_LIMIT; 7947c657876SArnaldo Carvalho de Melo if (interval > 4) 7957c657876SArnaldo Carvalho de Melo goto found; 7967c657876SArnaldo Carvalho de Melo break; 7977c657876SArnaldo Carvalho de Melo } 7987c657876SArnaldo Carvalho de Melo } 7997c657876SArnaldo Carvalho de Melo } 8007c657876SArnaldo Carvalho de Melo 80159d203f9SArnaldo Carvalho de Melo if (unlikely(step == 0)) { 80259348b19SGerrit Renker DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", 80359348b19SGerrit Renker dccp_role(sk), sk); 8047c657876SArnaldo Carvalho de Melo return ~0; 8057c657876SArnaldo Carvalho de Melo } 8067c657876SArnaldo Carvalho de Melo 80759d203f9SArnaldo Carvalho de Melo if (unlikely(interval == 0)) { 80859348b19SGerrit Renker DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." 80959348b19SGerrit Renker "Defaulting to 1\n", dccp_role(sk), sk); 8107c657876SArnaldo Carvalho de Melo interval = 1; 8117c657876SArnaldo Carvalho de Melo } 8127c657876SArnaldo Carvalho de Melo found: 81366a377c5SIan McDonald if (!tail) { 81459348b19SGerrit Renker DCCP_CRIT("tail is null\n"); 81566a377c5SIan McDonald return ~0; 81666a377c5SIan McDonald } 817b6ee3d4aSArnaldo Carvalho de Melo rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; 8187c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", 8197c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, rtt); 82059348b19SGerrit Renker 82159348b19SGerrit Renker if (rtt == 0) { 82259348b19SGerrit Renker DCCP_WARN("RTT==0, setting to 1\n"); 8237c657876SArnaldo Carvalho de Melo rtt = 1; 82459348b19SGerrit Renker } 8257c657876SArnaldo Carvalho de Melo 826b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &tstamp); 827b0e56780SArnaldo Carvalho de Melo delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); 828b0e56780SArnaldo Carvalho de Melo x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); 8297c657876SArnaldo Carvalho de Melo 83066a377c5SIan McDonald if (x_recv == 0) 83166a377c5SIan McDonald x_recv = hcrx->ccid3hcrx_x_recv; 83266a377c5SIan McDonald 8337c657876SArnaldo Carvalho de Melo tmp1 = (u64)x_recv * (u64)rtt; 8347c657876SArnaldo Carvalho de Melo do_div(tmp1,10000000); 8357c657876SArnaldo Carvalho de Melo tmp2 = (u32)tmp1; 83666a377c5SIan McDonald 83766a377c5SIan McDonald if (!tmp2) { 83859348b19SGerrit Renker DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv, rtt); 83966a377c5SIan McDonald return ~0; 84066a377c5SIan McDonald } 84166a377c5SIan McDonald 8427c657876SArnaldo Carvalho de Melo fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; 8437c657876SArnaldo Carvalho de Melo /* do not alter order above or you will get overflow on 32 bit */ 84436729c1aSArnaldo Carvalho de Melo p = tfrc_calc_x_reverse_lookup(fval); 8451f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " 8461f2333aeSArnaldo Carvalho de Melo "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 8477c657876SArnaldo Carvalho de Melo 8487c657876SArnaldo Carvalho de Melo if (p == 0) 8497c657876SArnaldo Carvalho de Melo return ~0; 8507c657876SArnaldo Carvalho de Melo else 8517c657876SArnaldo Carvalho de Melo return 1000000 / p; 8527c657876SArnaldo Carvalho de Melo } 8537c657876SArnaldo Carvalho de Melo 8547c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) 8557c657876SArnaldo Carvalho de Melo { 85659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 857fc747e82SIan McDonald struct dccp_li_hist_entry *head; 85866a377c5SIan McDonald u64 seq_temp; 8597c657876SArnaldo Carvalho de Melo 86066a377c5SIan McDonald if (list_empty(&hcrx->ccid3hcrx_li_hist)) { 86166a377c5SIan McDonald if (!dccp_li_hist_interval_new(ccid3_li_hist, 86266a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) 863ae6706f0SArnaldo Carvalho de Melo return; 86466a377c5SIan McDonald 865fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 866fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 867fc747e82SIan McDonald head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); 86866a377c5SIan McDonald } else { 86966a377c5SIan McDonald struct dccp_li_hist_entry *entry; 87066a377c5SIan McDonald struct list_head *tail; 87166a377c5SIan McDonald 872fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 873fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 87466a377c5SIan McDonald /* FIXME win count check removed as was wrong */ 87566a377c5SIan McDonald /* should make this check with receive history */ 87666a377c5SIan McDonald /* and compare there as per section 10.2 of RFC4342 */ 87766a377c5SIan McDonald 87866a377c5SIan McDonald /* new loss event detected */ 87966a377c5SIan McDonald /* calculate last interval length */ 88066a377c5SIan McDonald seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); 88166a377c5SIan McDonald entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); 88266a377c5SIan McDonald 88366a377c5SIan McDonald if (entry == NULL) { 88459348b19SGerrit Renker DCCP_BUG("out of memory - can not allocate entry"); 88566a377c5SIan McDonald return; 8867c657876SArnaldo Carvalho de Melo } 8877c657876SArnaldo Carvalho de Melo 88866a377c5SIan McDonald list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); 88966a377c5SIan McDonald 89066a377c5SIan McDonald tail = hcrx->ccid3hcrx_li_hist.prev; 89166a377c5SIan McDonald list_del(tail); 89266a377c5SIan McDonald kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); 89366a377c5SIan McDonald 89466a377c5SIan McDonald /* Create the newest interval */ 89566a377c5SIan McDonald entry->dccplih_seqno = seq_loss; 89666a377c5SIan McDonald entry->dccplih_interval = seq_temp; 89766a377c5SIan McDonald entry->dccplih_win_count = win_loss; 89866a377c5SIan McDonald } 89966a377c5SIan McDonald } 90066a377c5SIan McDonald 90166a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 90266a377c5SIan McDonald struct dccp_rx_hist_entry *packet) 9037c657876SArnaldo Carvalho de Melo { 90459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 90566a377c5SIan McDonald struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); 90666a377c5SIan McDonald u64 seqno = packet->dccphrx_seqno; 90766a377c5SIan McDonald u64 tmp_seqno; 90866a377c5SIan McDonald int loss = 0; 90966a377c5SIan McDonald u8 ccval; 9107c657876SArnaldo Carvalho de Melo 91166a377c5SIan McDonald 91266a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 91366a377c5SIan McDonald 91466a377c5SIan McDonald if (!rx_hist || 91566a377c5SIan McDonald follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 91666a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 91766a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 91866a377c5SIan McDonald goto detect_out; 91966a377c5SIan McDonald } 92066a377c5SIan McDonald 92166a377c5SIan McDonald 92266a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 92366a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 92466a377c5SIan McDonald loss = 1; 92566a377c5SIan McDonald ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, 92666a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 92766a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 92866a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 92966a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 93066a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 93166a377c5SIan McDonald while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 93266a377c5SIan McDonald tmp_seqno, &ccval)) { 93366a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 93466a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 93566a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 93666a377c5SIan McDonald } 93766a377c5SIan McDonald } 93866a377c5SIan McDonald 93966a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 94066a377c5SIan McDonald /* but works at moment */ 94166a377c5SIan McDonald if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 94266a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 94366a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 94466a377c5SIan McDonald } 94566a377c5SIan McDonald 94666a377c5SIan McDonald detect_out: 94766a377c5SIan McDonald dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 94866a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 94966a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 95066a377c5SIan McDonald return loss; 9517c657876SArnaldo Carvalho de Melo } 9527c657876SArnaldo Carvalho de Melo 9537c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 9547c657876SArnaldo Carvalho de Melo { 95559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9564fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 9578c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 9587c657876SArnaldo Carvalho de Melo struct timeval now; 95966a377c5SIan McDonald u32 p_prev, rtt_prev, r_sample, t_elapsed; 96078ad713dSGerrit Renker int loss, payload_size; 9611f2333aeSArnaldo Carvalho de Melo 96259348b19SGerrit Renker BUG_ON(hcrx == NULL); 9637c657876SArnaldo Carvalho de Melo 96459725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 9654fded33bSArnaldo Carvalho de Melo 9667c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 9677c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 9687c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 9697c657876SArnaldo Carvalho de Melo return; 9707c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 9714fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 9727c657876SArnaldo Carvalho de Melo break; 97366a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 974b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 975b3a3077dSArnaldo Carvalho de Melo timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); 976b3a3077dSArnaldo Carvalho de Melo r_sample = timeval_usecs(&now); 977b3a3077dSArnaldo Carvalho de Melo t_elapsed = opt_recv->dccpor_elapsed_time * 10; 978b3a3077dSArnaldo Carvalho de Melo 979b3a3077dSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 98059348b19SGerrit Renker DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", 98159348b19SGerrit Renker r_sample, t_elapsed); 982b3a3077dSArnaldo Carvalho de Melo else 983b3a3077dSArnaldo Carvalho de Melo r_sample -= t_elapsed; 984b3a3077dSArnaldo Carvalho de Melo 985b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 986b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 987b3a3077dSArnaldo Carvalho de Melo else 988b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 989b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 990b3a3077dSArnaldo Carvalho de Melo 99166a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 99266a377c5SIan McDonald ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", 9934fded33bSArnaldo Carvalho de Melo dccp_role(sk), hcrx->ccid3hcrx_rtt, 9944fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 9957c657876SArnaldo Carvalho de Melo break; 9967c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 9977c657876SArnaldo Carvalho de Melo break; 99859d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 9997c657876SArnaldo Carvalho de Melo return; 10007c657876SArnaldo Carvalho de Melo } 10017c657876SArnaldo Carvalho de Melo 1002b0e56780SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, 10038c60f3faSArnaldo Carvalho de Melo skb, SLAB_ATOMIC); 100459d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 100559348b19SGerrit Renker DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " 100659348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 10077c657876SArnaldo Carvalho de Melo return; 10087c657876SArnaldo Carvalho de Melo } 10097c657876SArnaldo Carvalho de Melo 101066a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 10117c657876SArnaldo Carvalho de Melo 10127c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 10137c657876SArnaldo Carvalho de Melo return; 10147c657876SArnaldo Carvalho de Melo 101578ad713dSGerrit Renker payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; 101678ad713dSGerrit Renker ccid3_hc_rx_update_s(hcrx, payload_size); 101778ad713dSGerrit Renker 10187c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 10197c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 10201f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " 10211f2333aeSArnaldo Carvalho de Melo "feedback\n", 10221f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 10231f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 10247c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10257c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 10267c657876SArnaldo Carvalho de Melo return; 10277c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 102878ad713dSGerrit Renker hcrx->ccid3hcrx_bytes_recv += payload_size; 102966a377c5SIan McDonald if (loss) 1030b6ee3d4aSArnaldo Carvalho de Melo break; 1031b6ee3d4aSArnaldo Carvalho de Melo 1032b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 1033b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= 10344fded33bSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt) { 1035b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 10367c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10377c657876SArnaldo Carvalho de Melo } 10387c657876SArnaldo Carvalho de Melo return; 103959348b19SGerrit Renker case TFRC_RSTATE_TERM: 104059348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 10417c657876SArnaldo Carvalho de Melo return; 10427c657876SArnaldo Carvalho de Melo } 10437c657876SArnaldo Carvalho de Melo 10447c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 10454fded33bSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", 10464fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 10477c657876SArnaldo Carvalho de Melo 10487c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 10497c657876SArnaldo Carvalho de Melo 10507c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 1051c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 1052c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 1053c0996660SIan McDonald 10547c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 1055c0996660SIan McDonald if (i_mean != 0) 1056c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 105759348b19SGerrit Renker } else 105859348b19SGerrit Renker DCCP_BUG("empty loss history"); 10597c657876SArnaldo Carvalho de Melo 10607c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 10617c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10627c657876SArnaldo Carvalho de Melo return; 10637c657876SArnaldo Carvalho de Melo } 10647c657876SArnaldo Carvalho de Melo } 10657c657876SArnaldo Carvalho de Melo 106691f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 10677c657876SArnaldo Carvalho de Melo { 106891f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 10697c657876SArnaldo Carvalho de Melo 10707c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 10717c657876SArnaldo Carvalho de Melo 10727c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 10737c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 1074ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 1075b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); 1076954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; 107778ad713dSGerrit Renker hcrx->ccid3hcrx_s = 0; 1078954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ 10797c657876SArnaldo Carvalho de Melo return 0; 10807c657876SArnaldo Carvalho de Melo } 10817c657876SArnaldo Carvalho de Melo 10827c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 10837c657876SArnaldo Carvalho de Melo { 108459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 10857c657876SArnaldo Carvalho de Melo 108659d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 10877c657876SArnaldo Carvalho de Melo 10887c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 10897c657876SArnaldo Carvalho de Melo 10907c657876SArnaldo Carvalho de Melo /* Empty packet history */ 10918c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 10927c657876SArnaldo Carvalho de Melo 10937c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 1094ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); 10957c657876SArnaldo Carvalho de Melo } 10967c657876SArnaldo Carvalho de Melo 10972babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 10982babe1f6SArnaldo Carvalho de Melo { 109959725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 11002babe1f6SArnaldo Carvalho de Melo 110159c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 110259c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 110359c2353dSArnaldo Carvalho de Melo return; 110459c2353dSArnaldo Carvalho de Melo 110559d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 11062babe1f6SArnaldo Carvalho de Melo 11072babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 11082babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 11092babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 11102babe1f6SArnaldo Carvalho de Melo } 11112babe1f6SArnaldo Carvalho de Melo 11122babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 11132babe1f6SArnaldo Carvalho de Melo { 111459725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 11152babe1f6SArnaldo Carvalho de Melo 111659c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 111759c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 111859c2353dSArnaldo Carvalho de Melo return; 111959c2353dSArnaldo Carvalho de Melo 112059d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 11212babe1f6SArnaldo Carvalho de Melo 11222babe1f6SArnaldo Carvalho de Melo info->tcpi_rto = hctx->ccid3hctx_t_rto; 11232babe1f6SArnaldo Carvalho de Melo info->tcpi_rtt = hctx->ccid3hctx_rtt; 11242babe1f6SArnaldo Carvalho de Melo } 11252babe1f6SArnaldo Carvalho de Melo 112688f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 112788f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 112888f964dbSArnaldo Carvalho de Melo { 112988f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 113088f964dbSArnaldo Carvalho de Melo const void *val; 113188f964dbSArnaldo Carvalho de Melo 113288f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 113388f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 113488f964dbSArnaldo Carvalho de Melo return -EINVAL; 113588f964dbSArnaldo Carvalho de Melo 113688f964dbSArnaldo Carvalho de Melo switch (optname) { 113788f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 113888f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 113988f964dbSArnaldo Carvalho de Melo return -EINVAL; 114088f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 114188f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 114288f964dbSArnaldo Carvalho de Melo break; 114388f964dbSArnaldo Carvalho de Melo default: 114488f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 114588f964dbSArnaldo Carvalho de Melo } 114688f964dbSArnaldo Carvalho de Melo 114788f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 114888f964dbSArnaldo Carvalho de Melo return -EFAULT; 114988f964dbSArnaldo Carvalho de Melo 115088f964dbSArnaldo Carvalho de Melo return 0; 115188f964dbSArnaldo Carvalho de Melo } 115288f964dbSArnaldo Carvalho de Melo 115388f964dbSArnaldo Carvalho de Melo static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 115488f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 115588f964dbSArnaldo Carvalho de Melo { 115688f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 115788f964dbSArnaldo Carvalho de Melo const void *val; 115888f964dbSArnaldo Carvalho de Melo 115988f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 116088f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 116188f964dbSArnaldo Carvalho de Melo return -EINVAL; 116288f964dbSArnaldo Carvalho de Melo 116388f964dbSArnaldo Carvalho de Melo switch (optname) { 116488f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_TX_INFO: 116588f964dbSArnaldo Carvalho de Melo if (len < sizeof(hctx->ccid3hctx_tfrc)) 116688f964dbSArnaldo Carvalho de Melo return -EINVAL; 116788f964dbSArnaldo Carvalho de Melo len = sizeof(hctx->ccid3hctx_tfrc); 116888f964dbSArnaldo Carvalho de Melo val = &hctx->ccid3hctx_tfrc; 116988f964dbSArnaldo Carvalho de Melo break; 117088f964dbSArnaldo Carvalho de Melo default: 117188f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 117288f964dbSArnaldo Carvalho de Melo } 117388f964dbSArnaldo Carvalho de Melo 117488f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 117588f964dbSArnaldo Carvalho de Melo return -EFAULT; 117688f964dbSArnaldo Carvalho de Melo 117788f964dbSArnaldo Carvalho de Melo return 0; 117888f964dbSArnaldo Carvalho de Melo } 117988f964dbSArnaldo Carvalho de Melo 118091f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 11813dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 11827c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 11837c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 118491f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 11857c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 11867c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 11877c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 11887c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 11897c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 11907c657876SArnaldo Carvalho de Melo .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, 11917c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 119291f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 11937c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 11947c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 11957c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 11967c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 11972babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 11982babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 119988f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 120088f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 12017c657876SArnaldo Carvalho de Melo }; 12027c657876SArnaldo Carvalho de Melo 120356724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 12047c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 12057c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 120656724aa4SGerrit Renker #endif 12077c657876SArnaldo Carvalho de Melo 12087c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 12097c657876SArnaldo Carvalho de Melo { 12108c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 12117c657876SArnaldo Carvalho de Melo 12128c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 12138c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 12147c657876SArnaldo Carvalho de Melo goto out; 12157c657876SArnaldo Carvalho de Melo 12168c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 12178c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 12188c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 12197c657876SArnaldo Carvalho de Melo 1220ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = dccp_li_hist_new("ccid3"); 1221ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist == NULL) 12228c60f3faSArnaldo Carvalho de Melo goto out_free_tx; 12237c657876SArnaldo Carvalho de Melo 12247c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 12257c657876SArnaldo Carvalho de Melo if (rc != 0) 12267c657876SArnaldo Carvalho de Melo goto out_free_loss_interval_history; 12277c657876SArnaldo Carvalho de Melo out: 12287c657876SArnaldo Carvalho de Melo return rc; 12298c60f3faSArnaldo Carvalho de Melo 12307c657876SArnaldo Carvalho de Melo out_free_loss_interval_history: 1231ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1232ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12338c60f3faSArnaldo Carvalho de Melo out_free_tx: 12348c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12358c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12368c60f3faSArnaldo Carvalho de Melo out_free_rx: 12378c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12388c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12397c657876SArnaldo Carvalho de Melo goto out; 12407c657876SArnaldo Carvalho de Melo } 12417c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 12427c657876SArnaldo Carvalho de Melo 12437c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 12447c657876SArnaldo Carvalho de Melo { 12457c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 12467c657876SArnaldo Carvalho de Melo 12478c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 12488c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12498c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12507c657876SArnaldo Carvalho de Melo } 12518c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 12528c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12538c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12547c657876SArnaldo Carvalho de Melo } 1255ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist != NULL) { 1256ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1257ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12587c657876SArnaldo Carvalho de Melo } 12597c657876SArnaldo Carvalho de Melo } 12607c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 12617c657876SArnaldo Carvalho de Melo 1262e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 12631f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 12647c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 12657c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 12667c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1267