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 2488a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 2498a508ac2SGerrit Renker * See comments in packet_recv() regarding the value of t_RTO. 2506b5e633aSArnaldo Carvalho de Melo */ 2518a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 2527c657876SArnaldo Carvalho de Melo break; 25359348b19SGerrit Renker case TFRC_SSTATE_NO_SENT: 25459348b19SGerrit Renker DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); 25559348b19SGerrit Renker /* fall through */ 25659348b19SGerrit Renker case TFRC_SSTATE_TERM: 2577c657876SArnaldo Carvalho de Melo goto out; 2587c657876SArnaldo Carvalho de Melo } 2597c657876SArnaldo Carvalho de Melo 2607c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 26148e03eeeSGerrit Renker 26248e03eeeSGerrit Renker restart_timer: 26348e03eeeSGerrit Renker sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2642a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 2657c657876SArnaldo Carvalho de Melo out: 2667c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2677c657876SArnaldo Carvalho de Melo sock_put(sk); 2687c657876SArnaldo Carvalho de Melo } 2697c657876SArnaldo Carvalho de Melo 2707da7f456SGerrit Renker /* 2717da7f456SGerrit Renker * returns 2727da7f456SGerrit Renker * > 0: delay (in msecs) that should pass before actually sending 2737da7f456SGerrit Renker * = 0: can send immediately 2747da7f456SGerrit Renker * < 0: error condition; do not send packet 2757da7f456SGerrit Renker */ 2766b57c93dSGerrit Renker static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) 2777c657876SArnaldo Carvalho de Melo { 2787c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 27959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2808c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *new_packet; 2817c657876SArnaldo Carvalho de Melo struct timeval now; 28227258ee5SArnaldo Carvalho de Melo long delay; 2837c657876SArnaldo Carvalho de Melo 28459348b19SGerrit Renker BUG_ON(hctx == NULL); 2851f2333aeSArnaldo Carvalho de Melo 2867c657876SArnaldo Carvalho de Melo /* 287da335bafSGerrit Renker * This function is called only for Data and DataAck packets. Sending 288da335bafSGerrit Renker * zero-sized Data(Ack)s is theoretically possible, but for congestion 289da335bafSGerrit Renker * control this case is pathological - ignore it. 2907c657876SArnaldo Carvalho de Melo */ 2916b57c93dSGerrit Renker if (unlikely(skb->len == 0)) 292da335bafSGerrit Renker return -EBADMSG; 2937c657876SArnaldo Carvalho de Melo 2947c657876SArnaldo Carvalho de Melo /* See if last packet allocated was not sent */ 2958c60f3faSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 2968c60f3faSArnaldo Carvalho de Melo if (new_packet == NULL || new_packet->dccphtx_sent) { 2971f2333aeSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, 2981f2333aeSArnaldo Carvalho de Melo SLAB_ATOMIC); 2997c657876SArnaldo Carvalho de Melo 30059d203f9SArnaldo Carvalho de Melo if (unlikely(new_packet == NULL)) { 30159348b19SGerrit Renker DCCP_WARN("%s, sk=%p, not enough mem to add to history," 30259348b19SGerrit Renker "send refused\n", dccp_role(sk), sk); 3037da7f456SGerrit Renker return -ENOBUFS; 3047c657876SArnaldo Carvalho de Melo } 3057c657876SArnaldo Carvalho de Melo 3068c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); 3077c657876SArnaldo Carvalho de Melo } 3087c657876SArnaldo Carvalho de Melo 309b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3107c657876SArnaldo Carvalho de Melo 3117c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3127c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3131f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3141f2333aeSArnaldo Carvalho de Melo jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); 3157c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3167c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3177c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3187c657876SArnaldo Carvalho de Melo 31978ad713dSGerrit Renker /* Set initial sending rate to 1 packet per second */ 3206b57c93dSGerrit Renker ccid3_hc_tx_update_s(hctx, skb->len); 32178ad713dSGerrit Renker hctx->ccid3hctx_x = hctx->ccid3hctx_s; 32278ad713dSGerrit Renker 32390feeb95SGerrit Renker /* First timeout, according to [RFC 3448, 4.2], is 1 second */ 32490feeb95SGerrit Renker hctx->ccid3hctx_t_ipi = USEC_PER_SEC; 32590feeb95SGerrit Renker /* Initial delta: minimum of 0.5 sec and t_gran/2 */ 32690feeb95SGerrit Renker hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; 32790feeb95SGerrit Renker 32890feeb95SGerrit Renker /* Set t_0 for initial packet */ 3297c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 3307c657876SArnaldo Carvalho de Melo break; 3317c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3327c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 33391cf5a17SGerrit Renker delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); 33491cf5a17SGerrit Renker /* 33591cf5a17SGerrit Renker * Scheduling of packet transmissions [RFC 3448, 4.6] 33691cf5a17SGerrit Renker * 33791cf5a17SGerrit Renker * if (t_now > t_nom - delta) 33891cf5a17SGerrit Renker * // send the packet now 33991cf5a17SGerrit Renker * else 34091cf5a17SGerrit Renker * // send the packet in (t_nom - t_now) milliseconds. 34191cf5a17SGerrit Renker */ 34276d12777SGerrit Renker if (delay - (long)hctx->ccid3hctx_delta >= 0) 3437da7f456SGerrit Renker return delay / 1000L; 3447c657876SArnaldo Carvalho de Melo break; 34559348b19SGerrit Renker case TFRC_SSTATE_TERM: 34659348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 3477da7f456SGerrit Renker return -EINVAL; 3487c657876SArnaldo Carvalho de Melo } 3497c657876SArnaldo Carvalho de Melo 3507da7f456SGerrit Renker /* prepare to send now (add options etc.) */ 351507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 3527da7f456SGerrit Renker new_packet->dccphtx_ccval = DCCP_SKB_CB(skb)->dccpd_ccval = 3538c60f3faSArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count; 3547da7f456SGerrit Renker timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); 3557da7f456SGerrit Renker 3567da7f456SGerrit Renker return 0; 3577c657876SArnaldo Carvalho de Melo } 3587c657876SArnaldo Carvalho de Melo 3596b57c93dSGerrit Renker static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len) 3607c657876SArnaldo Carvalho de Melo { 36159725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 36259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3637c657876SArnaldo Carvalho de Melo struct timeval now; 3646b57c93dSGerrit Renker unsigned long quarter_rtt; 3656b57c93dSGerrit Renker struct dccp_tx_hist_entry *packet; 3667c657876SArnaldo Carvalho de Melo 36759348b19SGerrit Renker BUG_ON(hctx == NULL); 3687c657876SArnaldo Carvalho de Melo 369b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3707c657876SArnaldo Carvalho de Melo 37178ad713dSGerrit Renker ccid3_hc_tx_update_s(hctx, len); 37278ad713dSGerrit Renker 3738c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 37459d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 37559348b19SGerrit Renker DCCP_WARN("packet doesn't exist in history!\n"); 3767c657876SArnaldo Carvalho de Melo return; 3777c657876SArnaldo Carvalho de Melo } 37859d203f9SArnaldo Carvalho de Melo if (unlikely(packet->dccphtx_sent)) { 37959348b19SGerrit Renker DCCP_WARN("no unsent packet in history!\n"); 3807c657876SArnaldo Carvalho de Melo return; 3817c657876SArnaldo Carvalho de Melo } 3828c60f3faSArnaldo Carvalho de Melo packet->dccphtx_tstamp = now; 3838c60f3faSArnaldo Carvalho de Melo packet->dccphtx_seqno = dp->dccps_gss; 3847c657876SArnaldo Carvalho de Melo /* 3851f2333aeSArnaldo Carvalho de Melo * Check if win_count have changed 3860e64e94eSGerrit Renker * Algorithm in "8.1. Window Counter Value" in RFC 4342. 3877c657876SArnaldo Carvalho de Melo */ 3886b5e633aSArnaldo Carvalho de Melo quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); 3896b5e633aSArnaldo Carvalho de Melo if (likely(hctx->ccid3hctx_rtt > 8)) 3906b5e633aSArnaldo Carvalho de Melo quarter_rtt /= hctx->ccid3hctx_rtt / 4; 3916b5e633aSArnaldo Carvalho de Melo 3927c657876SArnaldo Carvalho de Melo if (quarter_rtt > 0) { 3937c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3947c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + 3957c657876SArnaldo Carvalho de Melo min_t(unsigned long, quarter_rtt, 5)) % 16; 3961f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, window changed from " 3971f2333aeSArnaldo Carvalho de Melo "%u to %u!\n", 3987c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 399c1734376SArnaldo Carvalho de Melo packet->dccphtx_ccval, 4007c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count); 4017c657876SArnaldo Carvalho de Melo } 4021f2333aeSArnaldo Carvalho de Melo 4037c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 0; 404c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 4058c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 4067c657876SArnaldo Carvalho de Melo } 4077c657876SArnaldo Carvalho de Melo 4087c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 4097c657876SArnaldo Carvalho de Melo { 41059725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 41159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 4127c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4138c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 414b0e56780SArnaldo Carvalho de Melo struct timeval now; 4152a1fda6fSGerrit Renker unsigned long t_nfb; 4161bc09869SIan McDonald u32 t_elapsed; 4177c657876SArnaldo Carvalho de Melo u32 pinv; 4187c657876SArnaldo Carvalho de Melo u32 x_recv; 4197c657876SArnaldo Carvalho de Melo u32 r_sample; 4201f2333aeSArnaldo Carvalho de Melo 42159348b19SGerrit Renker BUG_ON(hctx == NULL); 4227c657876SArnaldo Carvalho de Melo 4237c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4247c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4257c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4267c657876SArnaldo Carvalho de Melo return; 4277c657876SArnaldo Carvalho de Melo 4287c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4297c657876SArnaldo Carvalho de Melo 4301a28599aSArnaldo Carvalho de Melo t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; 4317c657876SArnaldo Carvalho de Melo x_recv = opt_recv->ccid3or_receive_rate; 4327c657876SArnaldo Carvalho de Melo pinv = opt_recv->ccid3or_loss_event_rate; 4337c657876SArnaldo Carvalho de Melo 4347c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4357c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4367c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4377c657876SArnaldo Carvalho de Melo /* Calculate new round trip sample by 4387c657876SArnaldo Carvalho de Melo * R_sample = (now - t_recvdata) - t_delay */ 4397c657876SArnaldo Carvalho de Melo /* get t_recvdata from history */ 4408c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4418c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 44259d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 44359348b19SGerrit Renker DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist " 44459348b19SGerrit Renker "in history!\n", dccp_role(sk), sk, 44559d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4467c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4477c657876SArnaldo Carvalho de Melo return; 4487c657876SArnaldo Carvalho de Melo } 4497c657876SArnaldo Carvalho de Melo 4507c657876SArnaldo Carvalho de Melo /* Update RTT */ 451b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 452b0e56780SArnaldo Carvalho de Melo r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); 4531a28599aSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 45459348b19SGerrit Renker DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n", 45559348b19SGerrit Renker r_sample, t_elapsed); 4561a28599aSArnaldo Carvalho de Melo else 4571a28599aSArnaldo Carvalho de Melo r_sample -= t_elapsed; 4587c657876SArnaldo Carvalho de Melo 4597c657876SArnaldo Carvalho de Melo /* Update RTT estimate by 4607c657876SArnaldo Carvalho de Melo * If (No feedback recv) 4617c657876SArnaldo Carvalho de Melo * R = R_sample; 4627c657876SArnaldo Carvalho de Melo * Else 4637c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 4647c657876SArnaldo Carvalho de Melo * 4657c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 4667c657876SArnaldo Carvalho de Melo */ 4677c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 468a79ef76fSGerrit Renker /* Use Larger Initial Windows [RFC 4342, sec. 5] 469a79ef76fSGerrit Renker * We deviate in that we use `s' instead of `MSS'. */ 470a79ef76fSGerrit Renker u16 w_init = max( 4 * hctx->ccid3hctx_s, 471a79ef76fSGerrit Renker max(2 * hctx->ccid3hctx_s, 4380)); 4727c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 473a79ef76fSGerrit Renker hctx->ccid3hctx_x = usecs_div(w_init, r_sample); 474a79ef76fSGerrit Renker hctx->ccid3hctx_t_ld = now; 475a79ef76fSGerrit Renker 476a79ef76fSGerrit Renker ccid3_update_send_time(hctx); 477a79ef76fSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 478a79ef76fSGerrit Renker } else { 4791f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + 4801f2333aeSArnaldo Carvalho de Melo r_sample / 10; 481a79ef76fSGerrit Renker ccid3_hc_tx_update_x(sk, &now); 482a79ef76fSGerrit Renker } 4837c657876SArnaldo Carvalho de Melo 4841f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " 4851f2333aeSArnaldo Carvalho de Melo "r_sample=%us\n", dccp_role(sk), sk, 4861f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, r_sample); 4877c657876SArnaldo Carvalho de Melo 4887c657876SArnaldo Carvalho de Melo /* Update receive rate */ 4891f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ 4907c657876SArnaldo Carvalho de Melo 4917c657876SArnaldo Carvalho de Melo /* Update loss event rate */ 4927c657876SArnaldo Carvalho de Melo if (pinv == ~0 || pinv == 0) 4937c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 0; 4947c657876SArnaldo Carvalho de Melo else { 4957c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 1000000 / pinv; 4967c657876SArnaldo Carvalho de Melo 4977c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { 4987c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = TFRC_SMALLEST_P; 4991f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", 5001f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk); 5017c657876SArnaldo Carvalho de Melo } 5027c657876SArnaldo Carvalho de Melo } 5037c657876SArnaldo Carvalho de Melo 5047c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 5057c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5067c657876SArnaldo Carvalho de Melo 5077c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5088c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5098c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 510c530cfb1SArnaldo Carvalho de Melo /* 511c530cfb1SArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible that 5125d0dbc4aSGerrit Renker * we now can send a packet, so wake up dccp_wait_for_ccid 513c530cfb1SArnaldo Carvalho de Melo */ 514c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5158c60f3faSArnaldo Carvalho de Melo 5168a508ac2SGerrit Renker /* 5178a508ac2SGerrit Renker * Update timeout interval for the nofeedback timer. 5188a508ac2SGerrit Renker * We use a configuration option to increase the lower bound. 5198a508ac2SGerrit Renker * This can help avoid triggering the nofeedback timer too often 5208a508ac2SGerrit Renker * ('spinning') on LANs with small RTTs. 5218a508ac2SGerrit Renker */ 5225d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 5238a508ac2SGerrit Renker CONFIG_IP_DCCP_CCID3_RTO * 5248a508ac2SGerrit Renker (USEC_PER_SEC/1000) ); 5251f2333aeSArnaldo Carvalho de Melo /* 5261f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5278a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 5281f2333aeSArnaldo Carvalho de Melo */ 5298a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 5307c657876SArnaldo Carvalho de Melo 5311f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " 5321f2333aeSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5331f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 5342a1fda6fSGerrit Renker usecs_to_jiffies(t_nfb), t_nfb); 5357c657876SArnaldo Carvalho de Melo 5367c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5372a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 5387c657876SArnaldo Carvalho de Melo 5397c657876SArnaldo Carvalho de Melo /* set idle flag */ 5407c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5417c657876SArnaldo Carvalho de Melo break; 5425e19e3fcSGerrit Renker case TFRC_SSTATE_NO_SENT: 5435e19e3fcSGerrit Renker DCCP_WARN("Illegal ACK received - no packet has been sent\n"); 5445e19e3fcSGerrit Renker /* fall through */ 5455e19e3fcSGerrit Renker case TFRC_SSTATE_TERM: /* ignore feedback when closing */ 5467c657876SArnaldo Carvalho de Melo break; 5477c657876SArnaldo Carvalho de Melo } 5487c657876SArnaldo Carvalho de Melo } 5497c657876SArnaldo Carvalho de Melo 5502d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) 5517c657876SArnaldo Carvalho de Melo { 55259d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5537c657876SArnaldo Carvalho de Melo 55459d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 55559d203f9SArnaldo Carvalho de Melo 5562d0817d1SArnaldo Carvalho de Melo if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) 5577c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 5582d0817d1SArnaldo Carvalho de Melo return 0; 5597c657876SArnaldo Carvalho de Melo } 5607c657876SArnaldo Carvalho de Melo 5617c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5621f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5631f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5647c657876SArnaldo Carvalho de Melo { 5657c657876SArnaldo Carvalho de Melo int rc = 0; 56659725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 56759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5687c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 5697c657876SArnaldo Carvalho de Melo 57059d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 5717c657876SArnaldo Carvalho de Melo 5727c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5737c657876SArnaldo Carvalho de Melo 5747c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5757c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5767c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5777c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5787c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5797c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5807c657876SArnaldo Carvalho de Melo } 5817c657876SArnaldo Carvalho de Melo 5827c657876SArnaldo Carvalho de Melo switch (option) { 5837c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 58459d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 58559348b19SGerrit Renker DCCP_WARN("%s, sk=%p, invalid len %d " 58659348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 58759348b19SGerrit Renker dccp_role(sk), sk, len); 5887c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5897c657876SArnaldo Carvalho de Melo } else { 59060fe62e7SAndrea Bittau opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); 5917c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", 5927c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5937c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 5947c657876SArnaldo Carvalho de Melo } 5957c657876SArnaldo Carvalho de Melo break; 5967c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 5977c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 5987c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 5997c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", 6007c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6017c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 6027c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 6037c657876SArnaldo Carvalho de Melo break; 6047c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 60559d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 60659348b19SGerrit Renker DCCP_WARN("%s, sk=%p, invalid len %d " 60759348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 60859348b19SGerrit Renker dccp_role(sk), sk, len); 6097c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6107c657876SArnaldo Carvalho de Melo } else { 61160fe62e7SAndrea Bittau opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); 6127c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", 6137c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6147c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 6157c657876SArnaldo Carvalho de Melo } 6167c657876SArnaldo Carvalho de Melo break; 6177c657876SArnaldo Carvalho de Melo } 6187c657876SArnaldo Carvalho de Melo 6197c657876SArnaldo Carvalho de Melo return rc; 6207c657876SArnaldo Carvalho de Melo } 6217c657876SArnaldo Carvalho de Melo 62291f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 6237c657876SArnaldo Carvalho de Melo { 62491f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 6257c657876SArnaldo Carvalho de Melo 62678ad713dSGerrit Renker hctx->ccid3hctx_s = 0; 6277c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6287c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 629aa5d7df3SArnaldo Carvalho de Melo 630aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; 631aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 6327c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6337c657876SArnaldo Carvalho de Melo 6347c657876SArnaldo Carvalho de Melo return 0; 6357c657876SArnaldo Carvalho de Melo } 6367c657876SArnaldo Carvalho de Melo 6377c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6387c657876SArnaldo Carvalho de Melo { 63959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6407c657876SArnaldo Carvalho de Melo 6417c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 6427c657876SArnaldo Carvalho de Melo 6437c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6447c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6457c657876SArnaldo Carvalho de Melo 6467c657876SArnaldo Carvalho de Melo /* Empty packet history */ 6478c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 6487c657876SArnaldo Carvalho de Melo } 6497c657876SArnaldo Carvalho de Melo 6507c657876SArnaldo Carvalho de Melo /* 6517c657876SArnaldo Carvalho de Melo * RX Half Connection methods 6527c657876SArnaldo Carvalho de Melo */ 6537c657876SArnaldo Carvalho de Melo 65456724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6557c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6567c657876SArnaldo Carvalho de Melo { 6577c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6587c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6597c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6607c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6617c657876SArnaldo Carvalho de Melo }; 6627c657876SArnaldo Carvalho de Melo 6637c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6647c657876SArnaldo Carvalho de Melo } 6657c657876SArnaldo Carvalho de Melo #endif 6667c657876SArnaldo Carvalho de Melo 667c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 6681f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 6697c657876SArnaldo Carvalho de Melo { 67059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6717c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 6727c657876SArnaldo Carvalho de Melo 6737c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 6741f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 6751f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 6767c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 6777c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 6787c657876SArnaldo Carvalho de Melo } 6797c657876SArnaldo Carvalho de Melo 68078ad713dSGerrit Renker static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) 68178ad713dSGerrit Renker { 68278ad713dSGerrit Renker if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ 68378ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 68478ad713dSGerrit Renker else 68578ad713dSGerrit Renker hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : 68678ad713dSGerrit Renker (9 * hcrx->ccid3hcrx_s + len) / 10; 68778ad713dSGerrit Renker } 68878ad713dSGerrit Renker 6897c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 6907c657876SArnaldo Carvalho de Melo { 69159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6927c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 6938c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 694b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 6957c657876SArnaldo Carvalho de Melo 6967c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 6977c657876SArnaldo Carvalho de Melo 698b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 699b6ee3d4aSArnaldo Carvalho de Melo 7007c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 7017c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 7027c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 7037c657876SArnaldo Carvalho de Melo break; 7047c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: { 705b6ee3d4aSArnaldo Carvalho de Melo const u32 delta = timeval_delta(&now, 706b6ee3d4aSArnaldo Carvalho de Melo &hcrx->ccid3hcrx_tstamp_last_feedback); 70727ae543eSArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, 70827ae543eSArnaldo Carvalho de Melo delta); 7097c657876SArnaldo Carvalho de Melo } 7107c657876SArnaldo Carvalho de Melo break; 71159348b19SGerrit Renker case TFRC_RSTATE_TERM: 71259348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 7137c657876SArnaldo Carvalho de Melo return; 7147c657876SArnaldo Carvalho de Melo } 7157c657876SArnaldo Carvalho de Melo 7168c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 71759d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 71859348b19SGerrit Renker DCCP_WARN("%s, sk=%p, no data packet in history!\n", 71959348b19SGerrit Renker dccp_role(sk), sk); 7207c657876SArnaldo Carvalho de Melo return; 7217c657876SArnaldo Carvalho de Melo } 7227c657876SArnaldo Carvalho de Melo 723b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 72466a377c5SIan McDonald hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; 7257c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7267c657876SArnaldo Carvalho de Melo 7277c657876SArnaldo Carvalho de Melo /* Convert to multiples of 10us */ 728b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time = 729b6ee3d4aSArnaldo Carvalho de Melo timeval_delta(&now, &packet->dccphrx_tstamp) / 10; 7307c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 7317c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = ~0; 7327c657876SArnaldo Carvalho de Melo else 7337c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 734507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7357c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7367c657876SArnaldo Carvalho de Melo } 7377c657876SArnaldo Carvalho de Melo 7382d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7397c657876SArnaldo Carvalho de Melo { 74059d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 74160fe62e7SAndrea Bittau __be32 x_recv, pinv; 7427c657876SArnaldo Carvalho de Melo 74359d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 74459d203f9SArnaldo Carvalho de Melo 74559d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7462d0817d1SArnaldo Carvalho de Melo return 0; 7477c657876SArnaldo Carvalho de Melo 74866a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 7494fded33bSArnaldo Carvalho de Melo 7504fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7512d0817d1SArnaldo Carvalho de Melo return 0; 7524fded33bSArnaldo Carvalho de Melo 7534fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7544fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7552d0817d1SArnaldo Carvalho de Melo 7562d0817d1SArnaldo Carvalho de Melo if ((hcrx->ccid3hcrx_elapsed_time != 0 && 7572d0817d1SArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 7582d0817d1SArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time)) || 7592d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb) || 7604fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7612d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7624fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 7632d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 7642d0817d1SArnaldo Carvalho de Melo return -1; 7652d0817d1SArnaldo Carvalho de Melo 7662d0817d1SArnaldo Carvalho de Melo return 0; 7677c657876SArnaldo Carvalho de Melo } 7687c657876SArnaldo Carvalho de Melo 7697c657876SArnaldo Carvalho de Melo /* calculate first loss interval 7707c657876SArnaldo Carvalho de Melo * 7717c657876SArnaldo Carvalho de Melo * returns estimated loss interval in usecs */ 7727c657876SArnaldo Carvalho de Melo 7737c657876SArnaldo Carvalho de Melo static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) 7747c657876SArnaldo Carvalho de Melo { 77559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7768c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *entry, *next, *tail = NULL; 7777c657876SArnaldo Carvalho de Melo u32 rtt, delta, x_recv, fval, p, tmp2; 778b6ee3d4aSArnaldo Carvalho de Melo struct timeval tstamp = { 0, }; 7797c657876SArnaldo Carvalho de Melo int interval = 0; 7807c657876SArnaldo Carvalho de Melo int win_count = 0; 7817c657876SArnaldo Carvalho de Melo int step = 0; 7827c657876SArnaldo Carvalho de Melo u64 tmp1; 7837c657876SArnaldo Carvalho de Melo 7848c60f3faSArnaldo Carvalho de Melo list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, 7858c60f3faSArnaldo Carvalho de Melo dccphrx_node) { 7868c60f3faSArnaldo Carvalho de Melo if (dccp_rx_hist_entry_data_packet(entry)) { 7877c657876SArnaldo Carvalho de Melo tail = entry; 7887c657876SArnaldo Carvalho de Melo 7897c657876SArnaldo Carvalho de Melo switch (step) { 7907c657876SArnaldo Carvalho de Melo case 0: 7918c60f3faSArnaldo Carvalho de Melo tstamp = entry->dccphrx_tstamp; 792c1734376SArnaldo Carvalho de Melo win_count = entry->dccphrx_ccval; 7937c657876SArnaldo Carvalho de Melo step = 1; 7947c657876SArnaldo Carvalho de Melo break; 7957c657876SArnaldo Carvalho de Melo case 1: 796c1734376SArnaldo Carvalho de Melo interval = win_count - entry->dccphrx_ccval; 7977c657876SArnaldo Carvalho de Melo if (interval < 0) 7987c657876SArnaldo Carvalho de Melo interval += TFRC_WIN_COUNT_LIMIT; 7997c657876SArnaldo Carvalho de Melo if (interval > 4) 8007c657876SArnaldo Carvalho de Melo goto found; 8017c657876SArnaldo Carvalho de Melo break; 8027c657876SArnaldo Carvalho de Melo } 8037c657876SArnaldo Carvalho de Melo } 8047c657876SArnaldo Carvalho de Melo } 8057c657876SArnaldo Carvalho de Melo 80659d203f9SArnaldo Carvalho de Melo if (unlikely(step == 0)) { 80759348b19SGerrit Renker DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", 80859348b19SGerrit Renker dccp_role(sk), sk); 8097c657876SArnaldo Carvalho de Melo return ~0; 8107c657876SArnaldo Carvalho de Melo } 8117c657876SArnaldo Carvalho de Melo 81259d203f9SArnaldo Carvalho de Melo if (unlikely(interval == 0)) { 81359348b19SGerrit Renker DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." 81459348b19SGerrit Renker "Defaulting to 1\n", dccp_role(sk), sk); 8157c657876SArnaldo Carvalho de Melo interval = 1; 8167c657876SArnaldo Carvalho de Melo } 8177c657876SArnaldo Carvalho de Melo found: 81866a377c5SIan McDonald if (!tail) { 81959348b19SGerrit Renker DCCP_CRIT("tail is null\n"); 82066a377c5SIan McDonald return ~0; 82166a377c5SIan McDonald } 822b6ee3d4aSArnaldo Carvalho de Melo rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; 8237c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", 8247c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, rtt); 82559348b19SGerrit Renker 82659348b19SGerrit Renker if (rtt == 0) { 82759348b19SGerrit Renker DCCP_WARN("RTT==0, setting to 1\n"); 8287c657876SArnaldo Carvalho de Melo rtt = 1; 82959348b19SGerrit Renker } 8307c657876SArnaldo Carvalho de Melo 831b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &tstamp); 832b0e56780SArnaldo Carvalho de Melo delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); 833b0e56780SArnaldo Carvalho de Melo x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); 8347c657876SArnaldo Carvalho de Melo 83566a377c5SIan McDonald if (x_recv == 0) 83666a377c5SIan McDonald x_recv = hcrx->ccid3hcrx_x_recv; 83766a377c5SIan McDonald 8387c657876SArnaldo Carvalho de Melo tmp1 = (u64)x_recv * (u64)rtt; 8397c657876SArnaldo Carvalho de Melo do_div(tmp1,10000000); 8407c657876SArnaldo Carvalho de Melo tmp2 = (u32)tmp1; 84166a377c5SIan McDonald 84266a377c5SIan McDonald if (!tmp2) { 84359348b19SGerrit Renker DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv, rtt); 84466a377c5SIan McDonald return ~0; 84566a377c5SIan McDonald } 84666a377c5SIan McDonald 8477c657876SArnaldo Carvalho de Melo fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; 8487c657876SArnaldo Carvalho de Melo /* do not alter order above or you will get overflow on 32 bit */ 84936729c1aSArnaldo Carvalho de Melo p = tfrc_calc_x_reverse_lookup(fval); 8501f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " 8511f2333aeSArnaldo Carvalho de Melo "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 8527c657876SArnaldo Carvalho de Melo 8537c657876SArnaldo Carvalho de Melo if (p == 0) 8547c657876SArnaldo Carvalho de Melo return ~0; 8557c657876SArnaldo Carvalho de Melo else 8567c657876SArnaldo Carvalho de Melo return 1000000 / p; 8577c657876SArnaldo Carvalho de Melo } 8587c657876SArnaldo Carvalho de Melo 8597c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) 8607c657876SArnaldo Carvalho de Melo { 86159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 862fc747e82SIan McDonald struct dccp_li_hist_entry *head; 86366a377c5SIan McDonald u64 seq_temp; 8647c657876SArnaldo Carvalho de Melo 86566a377c5SIan McDonald if (list_empty(&hcrx->ccid3hcrx_li_hist)) { 86666a377c5SIan McDonald if (!dccp_li_hist_interval_new(ccid3_li_hist, 86766a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) 868ae6706f0SArnaldo Carvalho de Melo return; 86966a377c5SIan McDonald 870fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 871fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 872fc747e82SIan McDonald head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); 87366a377c5SIan McDonald } else { 87466a377c5SIan McDonald struct dccp_li_hist_entry *entry; 87566a377c5SIan McDonald struct list_head *tail; 87666a377c5SIan McDonald 877fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 878fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 87966a377c5SIan McDonald /* FIXME win count check removed as was wrong */ 88066a377c5SIan McDonald /* should make this check with receive history */ 88166a377c5SIan McDonald /* and compare there as per section 10.2 of RFC4342 */ 88266a377c5SIan McDonald 88366a377c5SIan McDonald /* new loss event detected */ 88466a377c5SIan McDonald /* calculate last interval length */ 88566a377c5SIan McDonald seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); 88666a377c5SIan McDonald entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); 88766a377c5SIan McDonald 88866a377c5SIan McDonald if (entry == NULL) { 88959348b19SGerrit Renker DCCP_BUG("out of memory - can not allocate entry"); 89066a377c5SIan McDonald return; 8917c657876SArnaldo Carvalho de Melo } 8927c657876SArnaldo Carvalho de Melo 89366a377c5SIan McDonald list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); 89466a377c5SIan McDonald 89566a377c5SIan McDonald tail = hcrx->ccid3hcrx_li_hist.prev; 89666a377c5SIan McDonald list_del(tail); 89766a377c5SIan McDonald kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); 89866a377c5SIan McDonald 89966a377c5SIan McDonald /* Create the newest interval */ 90066a377c5SIan McDonald entry->dccplih_seqno = seq_loss; 90166a377c5SIan McDonald entry->dccplih_interval = seq_temp; 90266a377c5SIan McDonald entry->dccplih_win_count = win_loss; 90366a377c5SIan McDonald } 90466a377c5SIan McDonald } 90566a377c5SIan McDonald 90666a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 90766a377c5SIan McDonald struct dccp_rx_hist_entry *packet) 9087c657876SArnaldo Carvalho de Melo { 90959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 91066a377c5SIan McDonald struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); 91166a377c5SIan McDonald u64 seqno = packet->dccphrx_seqno; 91266a377c5SIan McDonald u64 tmp_seqno; 91366a377c5SIan McDonald int loss = 0; 91466a377c5SIan McDonald u8 ccval; 9157c657876SArnaldo Carvalho de Melo 91666a377c5SIan McDonald 91766a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 91866a377c5SIan McDonald 91966a377c5SIan McDonald if (!rx_hist || 92066a377c5SIan McDonald follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 92166a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 92266a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 92366a377c5SIan McDonald goto detect_out; 92466a377c5SIan McDonald } 92566a377c5SIan McDonald 92666a377c5SIan McDonald 92766a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 92866a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 92966a377c5SIan McDonald loss = 1; 93066a377c5SIan McDonald ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, 93166a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 93266a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 93366a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 93466a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 93566a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 93666a377c5SIan McDonald while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 93766a377c5SIan McDonald tmp_seqno, &ccval)) { 93866a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 93966a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 94066a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 94166a377c5SIan McDonald } 94266a377c5SIan McDonald } 94366a377c5SIan McDonald 94466a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 94566a377c5SIan McDonald /* but works at moment */ 94666a377c5SIan McDonald if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 94766a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 94866a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 94966a377c5SIan McDonald } 95066a377c5SIan McDonald 95166a377c5SIan McDonald detect_out: 95266a377c5SIan McDonald dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 95366a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 95466a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 95566a377c5SIan McDonald return loss; 9567c657876SArnaldo Carvalho de Melo } 9577c657876SArnaldo Carvalho de Melo 9587c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 9597c657876SArnaldo Carvalho de Melo { 96059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9614fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 9628c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 9637c657876SArnaldo Carvalho de Melo struct timeval now; 96466a377c5SIan McDonald u32 p_prev, rtt_prev, r_sample, t_elapsed; 96578ad713dSGerrit Renker int loss, payload_size; 9661f2333aeSArnaldo Carvalho de Melo 96759348b19SGerrit Renker BUG_ON(hcrx == NULL); 9687c657876SArnaldo Carvalho de Melo 96959725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 9704fded33bSArnaldo Carvalho de Melo 9717c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 9727c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 9737c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 9747c657876SArnaldo Carvalho de Melo return; 9757c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 9764fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 9777c657876SArnaldo Carvalho de Melo break; 97866a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 979b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 980b3a3077dSArnaldo Carvalho de Melo timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); 981b3a3077dSArnaldo Carvalho de Melo r_sample = timeval_usecs(&now); 982b3a3077dSArnaldo Carvalho de Melo t_elapsed = opt_recv->dccpor_elapsed_time * 10; 983b3a3077dSArnaldo Carvalho de Melo 984b3a3077dSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 98559348b19SGerrit Renker DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", 98659348b19SGerrit Renker r_sample, t_elapsed); 987b3a3077dSArnaldo Carvalho de Melo else 988b3a3077dSArnaldo Carvalho de Melo r_sample -= t_elapsed; 989b3a3077dSArnaldo Carvalho de Melo 990b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 991b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 992b3a3077dSArnaldo Carvalho de Melo else 993b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 994b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 995b3a3077dSArnaldo Carvalho de Melo 99666a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 99766a377c5SIan McDonald ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", 9984fded33bSArnaldo Carvalho de Melo dccp_role(sk), hcrx->ccid3hcrx_rtt, 9994fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 10007c657876SArnaldo Carvalho de Melo break; 10017c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 10027c657876SArnaldo Carvalho de Melo break; 100359d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 10047c657876SArnaldo Carvalho de Melo return; 10057c657876SArnaldo Carvalho de Melo } 10067c657876SArnaldo Carvalho de Melo 1007b0e56780SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, 10088c60f3faSArnaldo Carvalho de Melo skb, SLAB_ATOMIC); 100959d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 101059348b19SGerrit Renker DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " 101159348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 10127c657876SArnaldo Carvalho de Melo return; 10137c657876SArnaldo Carvalho de Melo } 10147c657876SArnaldo Carvalho de Melo 101566a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 10167c657876SArnaldo Carvalho de Melo 10177c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 10187c657876SArnaldo Carvalho de Melo return; 10197c657876SArnaldo Carvalho de Melo 102078ad713dSGerrit Renker payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; 102178ad713dSGerrit Renker ccid3_hc_rx_update_s(hcrx, payload_size); 102278ad713dSGerrit Renker 10237c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 10247c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 10251f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " 10261f2333aeSArnaldo Carvalho de Melo "feedback\n", 10271f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 10281f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 10297c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10307c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 10317c657876SArnaldo Carvalho de Melo return; 10327c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 103378ad713dSGerrit Renker hcrx->ccid3hcrx_bytes_recv += payload_size; 103466a377c5SIan McDonald if (loss) 1035b6ee3d4aSArnaldo Carvalho de Melo break; 1036b6ee3d4aSArnaldo Carvalho de Melo 1037b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 1038b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= 10394fded33bSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt) { 1040b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 10417c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10427c657876SArnaldo Carvalho de Melo } 10437c657876SArnaldo Carvalho de Melo return; 104459348b19SGerrit Renker case TFRC_RSTATE_TERM: 104559348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 10467c657876SArnaldo Carvalho de Melo return; 10477c657876SArnaldo Carvalho de Melo } 10487c657876SArnaldo Carvalho de Melo 10497c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 10504fded33bSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", 10514fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 10527c657876SArnaldo Carvalho de Melo 10537c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 10547c657876SArnaldo Carvalho de Melo 10557c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 1056c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 1057c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 1058c0996660SIan McDonald 10597c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 1060c0996660SIan McDonald if (i_mean != 0) 1061c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 106259348b19SGerrit Renker } else 106359348b19SGerrit Renker DCCP_BUG("empty loss history"); 10647c657876SArnaldo Carvalho de Melo 10657c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 10667c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10677c657876SArnaldo Carvalho de Melo return; 10687c657876SArnaldo Carvalho de Melo } 10697c657876SArnaldo Carvalho de Melo } 10707c657876SArnaldo Carvalho de Melo 107191f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 10727c657876SArnaldo Carvalho de Melo { 107391f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 10747c657876SArnaldo Carvalho de Melo 10757c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 10767c657876SArnaldo Carvalho de Melo 10777c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 10787c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 1079ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 1080b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); 1081954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; 108278ad713dSGerrit Renker hcrx->ccid3hcrx_s = 0; 1083954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ 10847c657876SArnaldo Carvalho de Melo return 0; 10857c657876SArnaldo Carvalho de Melo } 10867c657876SArnaldo Carvalho de Melo 10877c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 10887c657876SArnaldo Carvalho de Melo { 108959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 10907c657876SArnaldo Carvalho de Melo 109159d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 10927c657876SArnaldo Carvalho de Melo 10937c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 10947c657876SArnaldo Carvalho de Melo 10957c657876SArnaldo Carvalho de Melo /* Empty packet history */ 10968c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 10977c657876SArnaldo Carvalho de Melo 10987c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 1099ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); 11007c657876SArnaldo Carvalho de Melo } 11017c657876SArnaldo Carvalho de Melo 11022babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 11032babe1f6SArnaldo Carvalho de Melo { 110459725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 11052babe1f6SArnaldo Carvalho de Melo 110659c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 110759c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 110859c2353dSArnaldo Carvalho de Melo return; 110959c2353dSArnaldo Carvalho de Melo 111059d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 11112babe1f6SArnaldo Carvalho de Melo 11122babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 11132babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 11142babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 11152babe1f6SArnaldo Carvalho de Melo } 11162babe1f6SArnaldo Carvalho de Melo 11172babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 11182babe1f6SArnaldo Carvalho de Melo { 111959725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 11202babe1f6SArnaldo Carvalho de Melo 112159c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 112259c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 112359c2353dSArnaldo Carvalho de Melo return; 112459c2353dSArnaldo Carvalho de Melo 112559d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 11262babe1f6SArnaldo Carvalho de Melo 11272babe1f6SArnaldo Carvalho de Melo info->tcpi_rto = hctx->ccid3hctx_t_rto; 11282babe1f6SArnaldo Carvalho de Melo info->tcpi_rtt = hctx->ccid3hctx_rtt; 11292babe1f6SArnaldo Carvalho de Melo } 11302babe1f6SArnaldo Carvalho de Melo 113188f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 113288f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 113388f964dbSArnaldo Carvalho de Melo { 113488f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 113588f964dbSArnaldo Carvalho de Melo const void *val; 113688f964dbSArnaldo Carvalho de Melo 113788f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 113888f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 113988f964dbSArnaldo Carvalho de Melo return -EINVAL; 114088f964dbSArnaldo Carvalho de Melo 114188f964dbSArnaldo Carvalho de Melo switch (optname) { 114288f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 114388f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 114488f964dbSArnaldo Carvalho de Melo return -EINVAL; 114588f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 114688f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 114788f964dbSArnaldo Carvalho de Melo break; 114888f964dbSArnaldo Carvalho de Melo default: 114988f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 115088f964dbSArnaldo Carvalho de Melo } 115188f964dbSArnaldo Carvalho de Melo 115288f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 115388f964dbSArnaldo Carvalho de Melo return -EFAULT; 115488f964dbSArnaldo Carvalho de Melo 115588f964dbSArnaldo Carvalho de Melo return 0; 115688f964dbSArnaldo Carvalho de Melo } 115788f964dbSArnaldo Carvalho de Melo 115888f964dbSArnaldo Carvalho de Melo static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 115988f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 116088f964dbSArnaldo Carvalho de Melo { 116188f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 116288f964dbSArnaldo Carvalho de Melo const void *val; 116388f964dbSArnaldo Carvalho de Melo 116488f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 116588f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 116688f964dbSArnaldo Carvalho de Melo return -EINVAL; 116788f964dbSArnaldo Carvalho de Melo 116888f964dbSArnaldo Carvalho de Melo switch (optname) { 116988f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_TX_INFO: 117088f964dbSArnaldo Carvalho de Melo if (len < sizeof(hctx->ccid3hctx_tfrc)) 117188f964dbSArnaldo Carvalho de Melo return -EINVAL; 117288f964dbSArnaldo Carvalho de Melo len = sizeof(hctx->ccid3hctx_tfrc); 117388f964dbSArnaldo Carvalho de Melo val = &hctx->ccid3hctx_tfrc; 117488f964dbSArnaldo Carvalho de Melo break; 117588f964dbSArnaldo Carvalho de Melo default: 117688f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 117788f964dbSArnaldo Carvalho de Melo } 117888f964dbSArnaldo Carvalho de Melo 117988f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 118088f964dbSArnaldo Carvalho de Melo return -EFAULT; 118188f964dbSArnaldo Carvalho de Melo 118288f964dbSArnaldo Carvalho de Melo return 0; 118388f964dbSArnaldo Carvalho de Melo } 118488f964dbSArnaldo Carvalho de Melo 118591f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 11863dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 11877c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 11887c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 118991f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 11907c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 11917c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 11927c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 11937c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 11947c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 11957c657876SArnaldo Carvalho de Melo .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, 11967c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 119791f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 11987c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 11997c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 12007c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 12017c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 12022babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 12032babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 120488f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 120588f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 12067c657876SArnaldo Carvalho de Melo }; 12077c657876SArnaldo Carvalho de Melo 120856724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 12097c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 12107c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 121156724aa4SGerrit Renker #endif 12127c657876SArnaldo Carvalho de Melo 12137c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 12147c657876SArnaldo Carvalho de Melo { 12158c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 12167c657876SArnaldo Carvalho de Melo 12178c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 12188c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 12197c657876SArnaldo Carvalho de Melo goto out; 12207c657876SArnaldo Carvalho de Melo 12218c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 12228c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 12238c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 12247c657876SArnaldo Carvalho de Melo 1225ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = dccp_li_hist_new("ccid3"); 1226ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist == NULL) 12278c60f3faSArnaldo Carvalho de Melo goto out_free_tx; 12287c657876SArnaldo Carvalho de Melo 12297c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 12307c657876SArnaldo Carvalho de Melo if (rc != 0) 12317c657876SArnaldo Carvalho de Melo goto out_free_loss_interval_history; 12327c657876SArnaldo Carvalho de Melo out: 12337c657876SArnaldo Carvalho de Melo return rc; 12348c60f3faSArnaldo Carvalho de Melo 12357c657876SArnaldo Carvalho de Melo out_free_loss_interval_history: 1236ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1237ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12388c60f3faSArnaldo Carvalho de Melo out_free_tx: 12398c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12408c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12418c60f3faSArnaldo Carvalho de Melo out_free_rx: 12428c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12438c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12447c657876SArnaldo Carvalho de Melo goto out; 12457c657876SArnaldo Carvalho de Melo } 12467c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 12477c657876SArnaldo Carvalho de Melo 12487c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 12497c657876SArnaldo Carvalho de Melo { 12507c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 12517c657876SArnaldo Carvalho de Melo 12528c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 12538c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12548c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12557c657876SArnaldo Carvalho de Melo } 12568c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 12578c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12588c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12597c657876SArnaldo Carvalho de Melo } 1260ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist != NULL) { 1261ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1262ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12637c657876SArnaldo Carvalho de Melo } 12647c657876SArnaldo Carvalho de Melo } 12657c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 12667c657876SArnaldo Carvalho de Melo 1267e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 12681f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 12697c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 12707c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 12717c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1272