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 */ 1317c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_update_x(struct sock *sk) 1327c657876SArnaldo Carvalho de Melo { 13359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 13417893bc1SGerrit Renker const __u32 old_x = hctx->ccid3hctx_x; 1357c657876SArnaldo Carvalho de Melo 1361f2333aeSArnaldo Carvalho de Melo /* To avoid large error in calcX */ 1371f2333aeSArnaldo Carvalho de Melo if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { 13836729c1aSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, 1397c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, 1407c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p); 1411f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, 1421f2333aeSArnaldo Carvalho de Melo 2 * hctx->ccid3hctx_x_recv), 1431f2333aeSArnaldo Carvalho de Melo (hctx->ccid3hctx_s / 1441f2333aeSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME)); 145b6ee3d4aSArnaldo Carvalho de Melo } else { 146b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 147b6ee3d4aSArnaldo Carvalho de Melo 148b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 149b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >= 150b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt) { 1516b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv, 1526b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x) * 2, 1536b5e633aSArnaldo Carvalho de Melo usecs_div(hctx->ccid3hctx_s, 1546b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 155b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 156b6ee3d4aSArnaldo Carvalho de Melo } 1577c657876SArnaldo Carvalho de Melo } 15817893bc1SGerrit Renker if (hctx->ccid3hctx_x != old_x) 15917893bc1SGerrit Renker ccid3_update_send_time(hctx); 1607c657876SArnaldo Carvalho de Melo } 1617c657876SArnaldo Carvalho de Melo 1627c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 1637c657876SArnaldo Carvalho de Melo { 1647c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 16559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 16648e03eeeSGerrit Renker unsigned long next_tmout = USEC_PER_SEC / 5; 1677c657876SArnaldo Carvalho de Melo 1687c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 1697c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 1707c657876SArnaldo Carvalho de Melo /* Try again later. */ 1717c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 17248e03eeeSGerrit Renker goto restart_timer; 1737c657876SArnaldo Carvalho de Melo } 1747c657876SArnaldo Carvalho de Melo 1757c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, 1767c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 1777c657876SArnaldo Carvalho de Melo 1787c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 1797c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 1807c657876SArnaldo Carvalho de Melo /* Halve send rate */ 1817c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x /= 2; 1826b5e633aSArnaldo Carvalho de Melo if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / 1836b5e633aSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME)) 1841f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = (hctx->ccid3hctx_s / 1851f2333aeSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME); 1867c657876SArnaldo Carvalho de Melo 1871f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " 1881f2333aeSArnaldo Carvalho de Melo "bytes/s\n", 1891f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 1901f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 1917c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x); 19248e03eeeSGerrit Renker /* The value of R is still undefined and so we can not recompute 19348e03eeeSGerrit Renker * the timout value. Keep initial value as per [RFC 4342, 5]. */ 19448e03eeeSGerrit Renker next_tmout = TFRC_INITIAL_TIMEOUT; 19517893bc1SGerrit Renker ccid3_update_send_time(hctx); 1967c657876SArnaldo Carvalho de Melo break; 1977c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 1981f2333aeSArnaldo Carvalho de Melo /* 1991f2333aeSArnaldo Carvalho de Melo * Check if IDLE since last timeout and recv rate is less than 2001f2333aeSArnaldo Carvalho de Melo * 4 packets per RTT 2011f2333aeSArnaldo Carvalho de Melo */ 2021f2333aeSArnaldo Carvalho de Melo if (!hctx->ccid3hctx_idle || 2036b5e633aSArnaldo Carvalho de Melo (hctx->ccid3hctx_x_recv >= 2046b5e633aSArnaldo Carvalho de Melo 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { 2051f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", 2061f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2077c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2087c657876SArnaldo Carvalho de Melo /* Halve sending rate */ 2097c657876SArnaldo Carvalho de Melo 2107c657876SArnaldo Carvalho de Melo /* If (X_calc > 2 * X_recv) 2117c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2127c657876SArnaldo Carvalho de Melo * Else 2137c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2147c657876SArnaldo Carvalho de Melo */ 2151f2333aeSArnaldo Carvalho de Melo BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && 2161f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc == 0); 2177c657876SArnaldo Carvalho de Melo 2187c657876SArnaldo Carvalho de Melo /* check also if p is zero -> x_calc is infinity? */ 2197c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P || 2207c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) 2217c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, 2227c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME)); 2237c657876SArnaldo Carvalho de Melo else 2247c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; 2257c657876SArnaldo Carvalho de Melo 2267c657876SArnaldo Carvalho de Melo /* Update sending rate */ 2277c657876SArnaldo Carvalho de Melo ccid3_hc_tx_update_x(sk); 2287c657876SArnaldo Carvalho de Melo } 2296b5e633aSArnaldo Carvalho de Melo /* 2306b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2315d0dbc4aSGerrit Renker * max(4 * t_RTO, 2 * s/X) = max(4 * t_RTO, 2 * t_ipi) 2325d0dbc4aSGerrit Renker * XXX This is non-standard, RFC 3448, 4.3 uses 4 * R 2336b5e633aSArnaldo Carvalho de Melo */ 2345d0dbc4aSGerrit Renker next_tmout = max(hctx->ccid3hctx_t_rto, 2*hctx->ccid3hctx_t_ipi); 2357c657876SArnaldo Carvalho de Melo break; 23659348b19SGerrit Renker case TFRC_SSTATE_NO_SENT: 23759348b19SGerrit Renker DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); 23859348b19SGerrit Renker /* fall through */ 23959348b19SGerrit Renker case TFRC_SSTATE_TERM: 2407c657876SArnaldo Carvalho de Melo goto out; 2417c657876SArnaldo Carvalho de Melo } 2427c657876SArnaldo Carvalho de Melo 2437c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 24448e03eeeSGerrit Renker 24548e03eeeSGerrit Renker restart_timer: 24648e03eeeSGerrit Renker sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 24748e03eeeSGerrit Renker jiffies + usecs_to_jiffies(next_tmout)); 2487c657876SArnaldo Carvalho de Melo out: 2497c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2507c657876SArnaldo Carvalho de Melo sock_put(sk); 2517c657876SArnaldo Carvalho de Melo } 2527c657876SArnaldo Carvalho de Melo 2537da7f456SGerrit Renker /* 2547da7f456SGerrit Renker * returns 2557da7f456SGerrit Renker * > 0: delay (in msecs) that should pass before actually sending 2567da7f456SGerrit Renker * = 0: can send immediately 2577da7f456SGerrit Renker * < 0: error condition; do not send packet 2587da7f456SGerrit Renker */ 25927258ee5SArnaldo Carvalho de Melo static int ccid3_hc_tx_send_packet(struct sock *sk, 26027258ee5SArnaldo Carvalho de Melo struct sk_buff *skb, int len) 2617c657876SArnaldo Carvalho de Melo { 2627c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 26359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2648c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *new_packet; 2657c657876SArnaldo Carvalho de Melo struct timeval now; 26627258ee5SArnaldo Carvalho de Melo long delay; 2677c657876SArnaldo Carvalho de Melo 26859348b19SGerrit Renker BUG_ON(hctx == NULL); 2691f2333aeSArnaldo Carvalho de Melo 2707c657876SArnaldo Carvalho de Melo /* 271da335bafSGerrit Renker * This function is called only for Data and DataAck packets. Sending 272da335bafSGerrit Renker * zero-sized Data(Ack)s is theoretically possible, but for congestion 273da335bafSGerrit Renker * control this case is pathological - ignore it. 2747c657876SArnaldo Carvalho de Melo */ 27559d203f9SArnaldo Carvalho de Melo if (unlikely(len == 0)) 276da335bafSGerrit Renker return -EBADMSG; 2777c657876SArnaldo Carvalho de Melo 2787c657876SArnaldo Carvalho de Melo /* See if last packet allocated was not sent */ 2798c60f3faSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 2808c60f3faSArnaldo Carvalho de Melo if (new_packet == NULL || new_packet->dccphtx_sent) { 2811f2333aeSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, 2821f2333aeSArnaldo Carvalho de Melo SLAB_ATOMIC); 2837c657876SArnaldo Carvalho de Melo 28459d203f9SArnaldo Carvalho de Melo if (unlikely(new_packet == NULL)) { 28559348b19SGerrit Renker DCCP_WARN("%s, sk=%p, not enough mem to add to history," 28659348b19SGerrit Renker "send refused\n", dccp_role(sk), sk); 2877da7f456SGerrit Renker return -ENOBUFS; 2887c657876SArnaldo Carvalho de Melo } 2897c657876SArnaldo Carvalho de Melo 2908c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); 2917c657876SArnaldo Carvalho de Melo } 2927c657876SArnaldo Carvalho de Melo 293b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 2947c657876SArnaldo Carvalho de Melo 2957c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 2967c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 2971f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2981f2333aeSArnaldo Carvalho de Melo jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); 2997c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3007c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3017c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3027c657876SArnaldo Carvalho de Melo 30390feeb95SGerrit Renker /* First timeout, according to [RFC 3448, 4.2], is 1 second */ 30490feeb95SGerrit Renker hctx->ccid3hctx_t_ipi = USEC_PER_SEC; 30590feeb95SGerrit Renker /* Initial delta: minimum of 0.5 sec and t_gran/2 */ 30690feeb95SGerrit Renker hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; 30790feeb95SGerrit Renker 30890feeb95SGerrit Renker /* Set t_0 for initial packet */ 3097c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 3107c657876SArnaldo Carvalho de Melo break; 3117c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3127c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 31391cf5a17SGerrit Renker delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); 31491cf5a17SGerrit Renker /* 31591cf5a17SGerrit Renker * Scheduling of packet transmissions [RFC 3448, 4.6] 31691cf5a17SGerrit Renker * 31791cf5a17SGerrit Renker * if (t_now > t_nom - delta) 31891cf5a17SGerrit Renker * // send the packet now 31991cf5a17SGerrit Renker * else 32091cf5a17SGerrit Renker * // send the packet in (t_nom - t_now) milliseconds. 32191cf5a17SGerrit Renker */ 3227da7f456SGerrit Renker if (delay >= hctx->ccid3hctx_delta) 3237da7f456SGerrit Renker return delay / 1000L; 3247c657876SArnaldo Carvalho de Melo break; 32559348b19SGerrit Renker case TFRC_SSTATE_TERM: 32659348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 3277da7f456SGerrit Renker return -EINVAL; 3287c657876SArnaldo Carvalho de Melo } 3297c657876SArnaldo Carvalho de Melo 3307da7f456SGerrit Renker /* prepare to send now (add options etc.) */ 331507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 3327da7f456SGerrit Renker new_packet->dccphtx_ccval = DCCP_SKB_CB(skb)->dccpd_ccval = 3338c60f3faSArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count; 3347da7f456SGerrit Renker timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); 3357da7f456SGerrit Renker 3367da7f456SGerrit Renker return 0; 3377c657876SArnaldo Carvalho de Melo } 3387c657876SArnaldo Carvalho de Melo 3397c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len) 3407c657876SArnaldo Carvalho de Melo { 34159725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 34259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3437c657876SArnaldo Carvalho de Melo struct timeval now; 3447c657876SArnaldo Carvalho de Melo 34559348b19SGerrit Renker BUG_ON(hctx == NULL); 3467c657876SArnaldo Carvalho de Melo 347b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3487c657876SArnaldo Carvalho de Melo 3497c657876SArnaldo Carvalho de Melo /* check if we have sent a data packet */ 3507c657876SArnaldo Carvalho de Melo if (len > 0) { 3517c657876SArnaldo Carvalho de Melo unsigned long quarter_rtt; 3528c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 3537c657876SArnaldo Carvalho de Melo 3548c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 35559d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 35659348b19SGerrit Renker DCCP_WARN("packet doesn't exist in history!\n"); 3577c657876SArnaldo Carvalho de Melo return; 3587c657876SArnaldo Carvalho de Melo } 35959d203f9SArnaldo Carvalho de Melo if (unlikely(packet->dccphtx_sent)) { 36059348b19SGerrit Renker DCCP_WARN("no unsent packet in history!\n"); 3617c657876SArnaldo Carvalho de Melo return; 3627c657876SArnaldo Carvalho de Melo } 3638c60f3faSArnaldo Carvalho de Melo packet->dccphtx_tstamp = now; 3648c60f3faSArnaldo Carvalho de Melo packet->dccphtx_seqno = dp->dccps_gss; 3657c657876SArnaldo Carvalho de Melo /* 3661f2333aeSArnaldo Carvalho de Melo * Check if win_count have changed 3670e64e94eSGerrit Renker * Algorithm in "8.1. Window Counter Value" in RFC 4342. 3687c657876SArnaldo Carvalho de Melo */ 3696b5e633aSArnaldo Carvalho de Melo quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); 3706b5e633aSArnaldo Carvalho de Melo if (likely(hctx->ccid3hctx_rtt > 8)) 3716b5e633aSArnaldo Carvalho de Melo quarter_rtt /= hctx->ccid3hctx_rtt / 4; 3726b5e633aSArnaldo Carvalho de Melo 3737c657876SArnaldo Carvalho de Melo if (quarter_rtt > 0) { 3747c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3757c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + 3767c657876SArnaldo Carvalho de Melo min_t(unsigned long, quarter_rtt, 5)) % 16; 3771f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, window changed from " 3781f2333aeSArnaldo Carvalho de Melo "%u to %u!\n", 3797c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 380c1734376SArnaldo Carvalho de Melo packet->dccphtx_ccval, 3817c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count); 3827c657876SArnaldo Carvalho de Melo } 3831f2333aeSArnaldo Carvalho de Melo 3847c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 0; 385c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 3868c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 3877c657876SArnaldo Carvalho de Melo } else 3887c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", 3897c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, dp->dccps_gss); 3907c657876SArnaldo Carvalho de Melo } 3917c657876SArnaldo Carvalho de Melo 3927c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 3937c657876SArnaldo Carvalho de Melo { 39459725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 39559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3967c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 3978c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 398b0e56780SArnaldo Carvalho de Melo struct timeval now; 3997c657876SArnaldo Carvalho de Melo unsigned long next_tmout; 4001bc09869SIan McDonald u32 t_elapsed; 4017c657876SArnaldo Carvalho de Melo u32 pinv; 4027c657876SArnaldo Carvalho de Melo u32 x_recv; 4037c657876SArnaldo Carvalho de Melo u32 r_sample; 4041f2333aeSArnaldo Carvalho de Melo 40559348b19SGerrit Renker BUG_ON(hctx == NULL); 4067c657876SArnaldo Carvalho de Melo 4077c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4087c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4097c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4107c657876SArnaldo Carvalho de Melo return; 4117c657876SArnaldo Carvalho de Melo 4127c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4137c657876SArnaldo Carvalho de Melo 4141a28599aSArnaldo Carvalho de Melo t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; 4157c657876SArnaldo Carvalho de Melo x_recv = opt_recv->ccid3or_receive_rate; 4167c657876SArnaldo Carvalho de Melo pinv = opt_recv->ccid3or_loss_event_rate; 4177c657876SArnaldo Carvalho de Melo 4187c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4197c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4207c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4217c657876SArnaldo Carvalho de Melo /* Calculate new round trip sample by 4227c657876SArnaldo Carvalho de Melo * R_sample = (now - t_recvdata) - t_delay */ 4237c657876SArnaldo Carvalho de Melo /* get t_recvdata from history */ 4248c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4258c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 42659d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 42759348b19SGerrit Renker DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist " 42859348b19SGerrit Renker "in history!\n", dccp_role(sk), sk, 42959d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4307c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4317c657876SArnaldo Carvalho de Melo return; 4327c657876SArnaldo Carvalho de Melo } 4337c657876SArnaldo Carvalho de Melo 4347c657876SArnaldo Carvalho de Melo /* Update RTT */ 435b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 436b0e56780SArnaldo Carvalho de Melo r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); 4371a28599aSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 43859348b19SGerrit Renker DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n", 43959348b19SGerrit Renker r_sample, t_elapsed); 4401a28599aSArnaldo Carvalho de Melo else 4411a28599aSArnaldo Carvalho de Melo r_sample -= t_elapsed; 4427c657876SArnaldo Carvalho de Melo 4437c657876SArnaldo Carvalho de Melo /* Update RTT estimate by 4447c657876SArnaldo Carvalho de Melo * If (No feedback recv) 4457c657876SArnaldo Carvalho de Melo * R = R_sample; 4467c657876SArnaldo Carvalho de Melo * Else 4477c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 4487c657876SArnaldo Carvalho de Melo * 4497c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 4507c657876SArnaldo Carvalho de Melo */ 4517c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 4527c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 4537c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 4547c657876SArnaldo Carvalho de Melo } else 4551f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + 4561f2333aeSArnaldo Carvalho de Melo r_sample / 10; 4577c657876SArnaldo Carvalho de Melo 4581f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " 4591f2333aeSArnaldo Carvalho de Melo "r_sample=%us\n", dccp_role(sk), sk, 4601f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, r_sample); 4617c657876SArnaldo Carvalho de Melo 4627c657876SArnaldo Carvalho de Melo /* Update receive rate */ 4631f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ 4647c657876SArnaldo Carvalho de Melo 4657c657876SArnaldo Carvalho de Melo /* Update loss event rate */ 4667c657876SArnaldo Carvalho de Melo if (pinv == ~0 || pinv == 0) 4677c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 0; 4687c657876SArnaldo Carvalho de Melo else { 4697c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 1000000 / pinv; 4707c657876SArnaldo Carvalho de Melo 4717c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { 4727c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = TFRC_SMALLEST_P; 4731f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", 4741f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk); 4757c657876SArnaldo Carvalho de Melo } 4767c657876SArnaldo Carvalho de Melo } 4777c657876SArnaldo Carvalho de Melo 4787c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 4797c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 4807c657876SArnaldo Carvalho de Melo 48117893bc1SGerrit Renker /* Update sending rate (and likely t_ipi, t_nom, and delta) */ 4827c657876SArnaldo Carvalho de Melo ccid3_hc_tx_update_x(sk); 4837c657876SArnaldo Carvalho de Melo 4847c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 4858c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 4868c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 487c530cfb1SArnaldo Carvalho de Melo /* 488c530cfb1SArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible that 4895d0dbc4aSGerrit Renker * we now can send a packet, so wake up dccp_wait_for_ccid 490c530cfb1SArnaldo Carvalho de Melo */ 491c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 4928c60f3faSArnaldo Carvalho de Melo 4935d0dbc4aSGerrit Renker 4945d0dbc4aSGerrit Renker /* Update timeout interval. We use the alternative variant of 4955d0dbc4aSGerrit Renker * [RFC 3448, 3.1] which sets the upper bound of t_rto to one 4965d0dbc4aSGerrit Renker * second, as it is suggested for TCP (see RFC 2988, 2.4). */ 4975d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 4985d0dbc4aSGerrit Renker USEC_PER_SEC ); 4991f2333aeSArnaldo Carvalho de Melo /* 5001f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5015d0dbc4aSGerrit Renker * max(4 * t_RTO, 2 * s/X) = max(4 * t_RTO, 2 * t_ipi) 5025d0dbc4aSGerrit Renker * XXX This is non-standard, RFC 3448, 4.3 uses 4 * R 5031f2333aeSArnaldo Carvalho de Melo */ 5045d0dbc4aSGerrit Renker next_tmout = max(hctx->ccid3hctx_t_rto, 2*hctx->ccid3hctx_t_ipi); 5057c657876SArnaldo Carvalho de Melo 5061f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " 5071f2333aeSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5081f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 5091f2333aeSArnaldo Carvalho de Melo usecs_to_jiffies(next_tmout), next_tmout); 5107c657876SArnaldo Carvalho de Melo 5117c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5125d0dbc4aSGerrit Renker jiffies + usecs_to_jiffies(next_tmout)); 5137c657876SArnaldo Carvalho de Melo 5147c657876SArnaldo Carvalho de Melo /* set idle flag */ 5157c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5167c657876SArnaldo Carvalho de Melo break; 5175e19e3fcSGerrit Renker case TFRC_SSTATE_NO_SENT: 5185e19e3fcSGerrit Renker DCCP_WARN("Illegal ACK received - no packet has been sent\n"); 5195e19e3fcSGerrit Renker /* fall through */ 5205e19e3fcSGerrit Renker case TFRC_SSTATE_TERM: /* ignore feedback when closing */ 5217c657876SArnaldo Carvalho de Melo break; 5227c657876SArnaldo Carvalho de Melo } 5237c657876SArnaldo Carvalho de Melo } 5247c657876SArnaldo Carvalho de Melo 5252d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) 5267c657876SArnaldo Carvalho de Melo { 52759d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5287c657876SArnaldo Carvalho de Melo 52959d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 53059d203f9SArnaldo Carvalho de Melo 5312d0817d1SArnaldo Carvalho de Melo if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) 5327c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 5332d0817d1SArnaldo Carvalho de Melo return 0; 5347c657876SArnaldo Carvalho de Melo } 5357c657876SArnaldo Carvalho de Melo 5367c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5371f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5381f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5397c657876SArnaldo Carvalho de Melo { 5407c657876SArnaldo Carvalho de Melo int rc = 0; 54159725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 54259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5437c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 5447c657876SArnaldo Carvalho de Melo 54559d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 5467c657876SArnaldo Carvalho de Melo 5477c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5487c657876SArnaldo Carvalho de Melo 5497c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5507c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5517c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5527c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5537c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5547c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5557c657876SArnaldo Carvalho de Melo } 5567c657876SArnaldo Carvalho de Melo 5577c657876SArnaldo Carvalho de Melo switch (option) { 5587c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 55959d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 56059348b19SGerrit Renker DCCP_WARN("%s, sk=%p, invalid len %d " 56159348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 56259348b19SGerrit Renker dccp_role(sk), sk, len); 5637c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5647c657876SArnaldo Carvalho de Melo } else { 56560fe62e7SAndrea Bittau opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); 5667c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", 5677c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5687c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 5697c657876SArnaldo Carvalho de Melo } 5707c657876SArnaldo Carvalho de Melo break; 5717c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 5727c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 5737c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 5747c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", 5757c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5767c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 5777c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 5787c657876SArnaldo Carvalho de Melo break; 5797c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 58059d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 58159348b19SGerrit Renker DCCP_WARN("%s, sk=%p, invalid len %d " 58259348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 58359348b19SGerrit Renker dccp_role(sk), sk, len); 5847c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5857c657876SArnaldo Carvalho de Melo } else { 58660fe62e7SAndrea Bittau opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); 5877c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", 5887c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5897c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 5907c657876SArnaldo Carvalho de Melo } 5917c657876SArnaldo Carvalho de Melo break; 5927c657876SArnaldo Carvalho de Melo } 5937c657876SArnaldo Carvalho de Melo 5947c657876SArnaldo Carvalho de Melo return rc; 5957c657876SArnaldo Carvalho de Melo } 5967c657876SArnaldo Carvalho de Melo 59791f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 5987c657876SArnaldo Carvalho de Melo { 5997c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 60091f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 6017c657876SArnaldo Carvalho de Melo 602a84ffe43SArnaldo Carvalho de Melo if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && 603a84ffe43SArnaldo Carvalho de Melo dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) 604a84ffe43SArnaldo Carvalho de Melo hctx->ccid3hctx_s = dp->dccps_packet_size; 6057c657876SArnaldo Carvalho de Melo else 6067c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE; 6077c657876SArnaldo Carvalho de Melo 6081f2333aeSArnaldo Carvalho de Melo /* Set transmission rate to 1 packet per second */ 6091f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = hctx->ccid3hctx_s; 6107c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6117c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 612aa5d7df3SArnaldo Carvalho de Melo 613aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; 614aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 6157c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6167c657876SArnaldo Carvalho de Melo 6177c657876SArnaldo Carvalho de Melo return 0; 6187c657876SArnaldo Carvalho de Melo } 6197c657876SArnaldo Carvalho de Melo 6207c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6217c657876SArnaldo Carvalho de Melo { 62259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6237c657876SArnaldo Carvalho de Melo 6247c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 6257c657876SArnaldo Carvalho de Melo 6267c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6277c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6287c657876SArnaldo Carvalho de Melo 6297c657876SArnaldo Carvalho de Melo /* Empty packet history */ 6308c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 6317c657876SArnaldo Carvalho de Melo } 6327c657876SArnaldo Carvalho de Melo 6337c657876SArnaldo Carvalho de Melo /* 6347c657876SArnaldo Carvalho de Melo * RX Half Connection methods 6357c657876SArnaldo Carvalho de Melo */ 6367c657876SArnaldo Carvalho de Melo 63756724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6387c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6397c657876SArnaldo Carvalho de Melo { 6407c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6417c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6427c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6437c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6447c657876SArnaldo Carvalho de Melo }; 6457c657876SArnaldo Carvalho de Melo 6467c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6477c657876SArnaldo Carvalho de Melo } 6487c657876SArnaldo Carvalho de Melo #endif 6497c657876SArnaldo Carvalho de Melo 650c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 6511f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 6527c657876SArnaldo Carvalho de Melo { 65359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6547c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 6557c657876SArnaldo Carvalho de Melo 6567c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 6571f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 6581f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 6597c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 6607c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 6617c657876SArnaldo Carvalho de Melo } 6627c657876SArnaldo Carvalho de Melo 6637c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 6647c657876SArnaldo Carvalho de Melo { 66559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6667c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 6678c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 668b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 6697c657876SArnaldo Carvalho de Melo 6707c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 6717c657876SArnaldo Carvalho de Melo 672b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 673b6ee3d4aSArnaldo Carvalho de Melo 6747c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 6757c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 6767c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 6777c657876SArnaldo Carvalho de Melo break; 6787c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: { 679b6ee3d4aSArnaldo Carvalho de Melo const u32 delta = timeval_delta(&now, 680b6ee3d4aSArnaldo Carvalho de Melo &hcrx->ccid3hcrx_tstamp_last_feedback); 68127ae543eSArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, 68227ae543eSArnaldo Carvalho de Melo delta); 6837c657876SArnaldo Carvalho de Melo } 6847c657876SArnaldo Carvalho de Melo break; 68559348b19SGerrit Renker case TFRC_RSTATE_TERM: 68659348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 6877c657876SArnaldo Carvalho de Melo return; 6887c657876SArnaldo Carvalho de Melo } 6897c657876SArnaldo Carvalho de Melo 6908c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 69159d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 69259348b19SGerrit Renker DCCP_WARN("%s, sk=%p, no data packet in history!\n", 69359348b19SGerrit Renker dccp_role(sk), sk); 6947c657876SArnaldo Carvalho de Melo return; 6957c657876SArnaldo Carvalho de Melo } 6967c657876SArnaldo Carvalho de Melo 697b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 69866a377c5SIan McDonald hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; 6997c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7007c657876SArnaldo Carvalho de Melo 7017c657876SArnaldo Carvalho de Melo /* Convert to multiples of 10us */ 702b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time = 703b6ee3d4aSArnaldo Carvalho de Melo timeval_delta(&now, &packet->dccphrx_tstamp) / 10; 7047c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 7057c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = ~0; 7067c657876SArnaldo Carvalho de Melo else 7077c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 708507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7097c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7107c657876SArnaldo Carvalho de Melo } 7117c657876SArnaldo Carvalho de Melo 7122d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7137c657876SArnaldo Carvalho de Melo { 71459d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 71560fe62e7SAndrea Bittau __be32 x_recv, pinv; 7167c657876SArnaldo Carvalho de Melo 71759d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 71859d203f9SArnaldo Carvalho de Melo 71959d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7202d0817d1SArnaldo Carvalho de Melo return 0; 7217c657876SArnaldo Carvalho de Melo 72266a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 7234fded33bSArnaldo Carvalho de Melo 7244fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7252d0817d1SArnaldo Carvalho de Melo return 0; 7264fded33bSArnaldo Carvalho de Melo 7274fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7284fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7292d0817d1SArnaldo Carvalho de Melo 7302d0817d1SArnaldo Carvalho de Melo if ((hcrx->ccid3hcrx_elapsed_time != 0 && 7312d0817d1SArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 7322d0817d1SArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time)) || 7332d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb) || 7344fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7352d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7364fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 7372d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 7382d0817d1SArnaldo Carvalho de Melo return -1; 7392d0817d1SArnaldo Carvalho de Melo 7402d0817d1SArnaldo Carvalho de Melo return 0; 7417c657876SArnaldo Carvalho de Melo } 7427c657876SArnaldo Carvalho de Melo 7437c657876SArnaldo Carvalho de Melo /* calculate first loss interval 7447c657876SArnaldo Carvalho de Melo * 7457c657876SArnaldo Carvalho de Melo * returns estimated loss interval in usecs */ 7467c657876SArnaldo Carvalho de Melo 7477c657876SArnaldo Carvalho de Melo static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) 7487c657876SArnaldo Carvalho de Melo { 74959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7508c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *entry, *next, *tail = NULL; 7517c657876SArnaldo Carvalho de Melo u32 rtt, delta, x_recv, fval, p, tmp2; 752b6ee3d4aSArnaldo Carvalho de Melo struct timeval tstamp = { 0, }; 7537c657876SArnaldo Carvalho de Melo int interval = 0; 7547c657876SArnaldo Carvalho de Melo int win_count = 0; 7557c657876SArnaldo Carvalho de Melo int step = 0; 7567c657876SArnaldo Carvalho de Melo u64 tmp1; 7577c657876SArnaldo Carvalho de Melo 7588c60f3faSArnaldo Carvalho de Melo list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, 7598c60f3faSArnaldo Carvalho de Melo dccphrx_node) { 7608c60f3faSArnaldo Carvalho de Melo if (dccp_rx_hist_entry_data_packet(entry)) { 7617c657876SArnaldo Carvalho de Melo tail = entry; 7627c657876SArnaldo Carvalho de Melo 7637c657876SArnaldo Carvalho de Melo switch (step) { 7647c657876SArnaldo Carvalho de Melo case 0: 7658c60f3faSArnaldo Carvalho de Melo tstamp = entry->dccphrx_tstamp; 766c1734376SArnaldo Carvalho de Melo win_count = entry->dccphrx_ccval; 7677c657876SArnaldo Carvalho de Melo step = 1; 7687c657876SArnaldo Carvalho de Melo break; 7697c657876SArnaldo Carvalho de Melo case 1: 770c1734376SArnaldo Carvalho de Melo interval = win_count - entry->dccphrx_ccval; 7717c657876SArnaldo Carvalho de Melo if (interval < 0) 7727c657876SArnaldo Carvalho de Melo interval += TFRC_WIN_COUNT_LIMIT; 7737c657876SArnaldo Carvalho de Melo if (interval > 4) 7747c657876SArnaldo Carvalho de Melo goto found; 7757c657876SArnaldo Carvalho de Melo break; 7767c657876SArnaldo Carvalho de Melo } 7777c657876SArnaldo Carvalho de Melo } 7787c657876SArnaldo Carvalho de Melo } 7797c657876SArnaldo Carvalho de Melo 78059d203f9SArnaldo Carvalho de Melo if (unlikely(step == 0)) { 78159348b19SGerrit Renker DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", 78259348b19SGerrit Renker dccp_role(sk), sk); 7837c657876SArnaldo Carvalho de Melo return ~0; 7847c657876SArnaldo Carvalho de Melo } 7857c657876SArnaldo Carvalho de Melo 78659d203f9SArnaldo Carvalho de Melo if (unlikely(interval == 0)) { 78759348b19SGerrit Renker DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." 78859348b19SGerrit Renker "Defaulting to 1\n", dccp_role(sk), sk); 7897c657876SArnaldo Carvalho de Melo interval = 1; 7907c657876SArnaldo Carvalho de Melo } 7917c657876SArnaldo Carvalho de Melo found: 79266a377c5SIan McDonald if (!tail) { 79359348b19SGerrit Renker DCCP_CRIT("tail is null\n"); 79466a377c5SIan McDonald return ~0; 79566a377c5SIan McDonald } 796b6ee3d4aSArnaldo Carvalho de Melo rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; 7977c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", 7987c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, rtt); 79959348b19SGerrit Renker 80059348b19SGerrit Renker if (rtt == 0) { 80159348b19SGerrit Renker DCCP_WARN("RTT==0, setting to 1\n"); 8027c657876SArnaldo Carvalho de Melo rtt = 1; 80359348b19SGerrit Renker } 8047c657876SArnaldo Carvalho de Melo 805b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &tstamp); 806b0e56780SArnaldo Carvalho de Melo delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); 807b0e56780SArnaldo Carvalho de Melo x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); 8087c657876SArnaldo Carvalho de Melo 80966a377c5SIan McDonald if (x_recv == 0) 81066a377c5SIan McDonald x_recv = hcrx->ccid3hcrx_x_recv; 81166a377c5SIan McDonald 8127c657876SArnaldo Carvalho de Melo tmp1 = (u64)x_recv * (u64)rtt; 8137c657876SArnaldo Carvalho de Melo do_div(tmp1,10000000); 8147c657876SArnaldo Carvalho de Melo tmp2 = (u32)tmp1; 81566a377c5SIan McDonald 81666a377c5SIan McDonald if (!tmp2) { 81759348b19SGerrit Renker DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv, rtt); 81866a377c5SIan McDonald return ~0; 81966a377c5SIan McDonald } 82066a377c5SIan McDonald 8217c657876SArnaldo Carvalho de Melo fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; 8227c657876SArnaldo Carvalho de Melo /* do not alter order above or you will get overflow on 32 bit */ 82336729c1aSArnaldo Carvalho de Melo p = tfrc_calc_x_reverse_lookup(fval); 8241f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " 8251f2333aeSArnaldo Carvalho de Melo "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 8267c657876SArnaldo Carvalho de Melo 8277c657876SArnaldo Carvalho de Melo if (p == 0) 8287c657876SArnaldo Carvalho de Melo return ~0; 8297c657876SArnaldo Carvalho de Melo else 8307c657876SArnaldo Carvalho de Melo return 1000000 / p; 8317c657876SArnaldo Carvalho de Melo } 8327c657876SArnaldo Carvalho de Melo 8337c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) 8347c657876SArnaldo Carvalho de Melo { 83559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 836fc747e82SIan McDonald struct dccp_li_hist_entry *head; 83766a377c5SIan McDonald u64 seq_temp; 8387c657876SArnaldo Carvalho de Melo 83966a377c5SIan McDonald if (list_empty(&hcrx->ccid3hcrx_li_hist)) { 84066a377c5SIan McDonald if (!dccp_li_hist_interval_new(ccid3_li_hist, 84166a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) 842ae6706f0SArnaldo Carvalho de Melo return; 84366a377c5SIan McDonald 844fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 845fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 846fc747e82SIan McDonald head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); 84766a377c5SIan McDonald } else { 84866a377c5SIan McDonald struct dccp_li_hist_entry *entry; 84966a377c5SIan McDonald struct list_head *tail; 85066a377c5SIan McDonald 851fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 852fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 85366a377c5SIan McDonald /* FIXME win count check removed as was wrong */ 85466a377c5SIan McDonald /* should make this check with receive history */ 85566a377c5SIan McDonald /* and compare there as per section 10.2 of RFC4342 */ 85666a377c5SIan McDonald 85766a377c5SIan McDonald /* new loss event detected */ 85866a377c5SIan McDonald /* calculate last interval length */ 85966a377c5SIan McDonald seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); 86066a377c5SIan McDonald entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); 86166a377c5SIan McDonald 86266a377c5SIan McDonald if (entry == NULL) { 86359348b19SGerrit Renker DCCP_BUG("out of memory - can not allocate entry"); 86466a377c5SIan McDonald return; 8657c657876SArnaldo Carvalho de Melo } 8667c657876SArnaldo Carvalho de Melo 86766a377c5SIan McDonald list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); 86866a377c5SIan McDonald 86966a377c5SIan McDonald tail = hcrx->ccid3hcrx_li_hist.prev; 87066a377c5SIan McDonald list_del(tail); 87166a377c5SIan McDonald kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); 87266a377c5SIan McDonald 87366a377c5SIan McDonald /* Create the newest interval */ 87466a377c5SIan McDonald entry->dccplih_seqno = seq_loss; 87566a377c5SIan McDonald entry->dccplih_interval = seq_temp; 87666a377c5SIan McDonald entry->dccplih_win_count = win_loss; 87766a377c5SIan McDonald } 87866a377c5SIan McDonald } 87966a377c5SIan McDonald 88066a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 88166a377c5SIan McDonald struct dccp_rx_hist_entry *packet) 8827c657876SArnaldo Carvalho de Melo { 88359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 88466a377c5SIan McDonald struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); 88566a377c5SIan McDonald u64 seqno = packet->dccphrx_seqno; 88666a377c5SIan McDonald u64 tmp_seqno; 88766a377c5SIan McDonald int loss = 0; 88866a377c5SIan McDonald u8 ccval; 8897c657876SArnaldo Carvalho de Melo 89066a377c5SIan McDonald 89166a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 89266a377c5SIan McDonald 89366a377c5SIan McDonald if (!rx_hist || 89466a377c5SIan McDonald follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 89566a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 89666a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 89766a377c5SIan McDonald goto detect_out; 89866a377c5SIan McDonald } 89966a377c5SIan McDonald 90066a377c5SIan McDonald 90166a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 90266a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 90366a377c5SIan McDonald loss = 1; 90466a377c5SIan McDonald ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, 90566a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 90666a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 90766a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 90866a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 90966a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 91066a377c5SIan McDonald while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 91166a377c5SIan McDonald tmp_seqno, &ccval)) { 91266a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 91366a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 91466a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 91566a377c5SIan McDonald } 91666a377c5SIan McDonald } 91766a377c5SIan McDonald 91866a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 91966a377c5SIan McDonald /* but works at moment */ 92066a377c5SIan McDonald if (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 } 92466a377c5SIan McDonald 92566a377c5SIan McDonald detect_out: 92666a377c5SIan McDonald dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 92766a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 92866a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 92966a377c5SIan McDonald return loss; 9307c657876SArnaldo Carvalho de Melo } 9317c657876SArnaldo Carvalho de Melo 9327c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 9337c657876SArnaldo Carvalho de Melo { 93459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9354fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 9368c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 9377c657876SArnaldo Carvalho de Melo struct timeval now; 93866a377c5SIan McDonald u32 p_prev, rtt_prev, r_sample, t_elapsed; 93966a377c5SIan McDonald int loss; 9401f2333aeSArnaldo Carvalho de Melo 94159348b19SGerrit Renker BUG_ON(hcrx == NULL); 9427c657876SArnaldo Carvalho de Melo 94359725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 9444fded33bSArnaldo Carvalho de Melo 9457c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 9467c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 9477c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 9487c657876SArnaldo Carvalho de Melo return; 9497c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 9504fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 9517c657876SArnaldo Carvalho de Melo break; 95266a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 953b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 954b3a3077dSArnaldo Carvalho de Melo timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); 955b3a3077dSArnaldo Carvalho de Melo r_sample = timeval_usecs(&now); 956b3a3077dSArnaldo Carvalho de Melo t_elapsed = opt_recv->dccpor_elapsed_time * 10; 957b3a3077dSArnaldo Carvalho de Melo 958b3a3077dSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 95959348b19SGerrit Renker DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", 96059348b19SGerrit Renker r_sample, t_elapsed); 961b3a3077dSArnaldo Carvalho de Melo else 962b3a3077dSArnaldo Carvalho de Melo r_sample -= t_elapsed; 963b3a3077dSArnaldo Carvalho de Melo 964b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 965b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 966b3a3077dSArnaldo Carvalho de Melo else 967b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 968b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 969b3a3077dSArnaldo Carvalho de Melo 97066a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 97166a377c5SIan McDonald ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", 9724fded33bSArnaldo Carvalho de Melo dccp_role(sk), hcrx->ccid3hcrx_rtt, 9734fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 9747c657876SArnaldo Carvalho de Melo break; 9757c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 9767c657876SArnaldo Carvalho de Melo break; 97759d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 9787c657876SArnaldo Carvalho de Melo return; 9797c657876SArnaldo Carvalho de Melo } 9807c657876SArnaldo Carvalho de Melo 981b0e56780SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, 9828c60f3faSArnaldo Carvalho de Melo skb, SLAB_ATOMIC); 98359d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 98459348b19SGerrit Renker DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " 98559348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 9867c657876SArnaldo Carvalho de Melo return; 9877c657876SArnaldo Carvalho de Melo } 9887c657876SArnaldo Carvalho de Melo 98966a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 9907c657876SArnaldo Carvalho de Melo 9917c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 9927c657876SArnaldo Carvalho de Melo return; 9937c657876SArnaldo Carvalho de Melo 9947c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 9957c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 9961f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " 9971f2333aeSArnaldo Carvalho de Melo "feedback\n", 9981f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 9991f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 10007c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10017c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 10027c657876SArnaldo Carvalho de Melo return; 10037c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 10041f2333aeSArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv += skb->len - 10051f2333aeSArnaldo Carvalho de Melo dccp_hdr(skb)->dccph_doff * 4; 100666a377c5SIan McDonald if (loss) 1007b6ee3d4aSArnaldo Carvalho de Melo break; 1008b6ee3d4aSArnaldo Carvalho de Melo 1009b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 1010b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= 10114fded33bSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt) { 1012b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 10137c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10147c657876SArnaldo Carvalho de Melo } 10157c657876SArnaldo Carvalho de Melo return; 101659348b19SGerrit Renker case TFRC_RSTATE_TERM: 101759348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 10187c657876SArnaldo Carvalho de Melo return; 10197c657876SArnaldo Carvalho de Melo } 10207c657876SArnaldo Carvalho de Melo 10217c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 10224fded33bSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", 10234fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 10247c657876SArnaldo Carvalho de Melo 10257c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 10267c657876SArnaldo Carvalho de Melo 10277c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 1028c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 1029c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 1030c0996660SIan McDonald 10317c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 1032c0996660SIan McDonald if (i_mean != 0) 1033c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 103459348b19SGerrit Renker } else 103559348b19SGerrit Renker DCCP_BUG("empty loss history"); 10367c657876SArnaldo Carvalho de Melo 10377c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 10387c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10397c657876SArnaldo Carvalho de Melo return; 10407c657876SArnaldo Carvalho de Melo } 10417c657876SArnaldo Carvalho de Melo } 10427c657876SArnaldo Carvalho de Melo 104391f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 10447c657876SArnaldo Carvalho de Melo { 10457c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 104691f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 10477c657876SArnaldo Carvalho de Melo 10487c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 10497c657876SArnaldo Carvalho de Melo 1050a84ffe43SArnaldo Carvalho de Melo if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && 1051a84ffe43SArnaldo Carvalho de Melo dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) 1052a84ffe43SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = dp->dccps_packet_size; 10537c657876SArnaldo Carvalho de Melo else 10547c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE; 10557c657876SArnaldo Carvalho de Melo 10567c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 10577c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 1058ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 1059b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); 1060954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; 1061954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ 10627c657876SArnaldo Carvalho de Melo return 0; 10637c657876SArnaldo Carvalho de Melo } 10647c657876SArnaldo Carvalho de Melo 10657c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 10667c657876SArnaldo Carvalho de Melo { 106759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 10687c657876SArnaldo Carvalho de Melo 106959d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 10707c657876SArnaldo Carvalho de Melo 10717c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 10727c657876SArnaldo Carvalho de Melo 10737c657876SArnaldo Carvalho de Melo /* Empty packet history */ 10748c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 10757c657876SArnaldo Carvalho de Melo 10767c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 1077ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); 10787c657876SArnaldo Carvalho de Melo } 10797c657876SArnaldo Carvalho de Melo 10802babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 10812babe1f6SArnaldo Carvalho de Melo { 108259725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 10832babe1f6SArnaldo Carvalho de Melo 108459c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 108559c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 108659c2353dSArnaldo Carvalho de Melo return; 108759c2353dSArnaldo Carvalho de Melo 108859d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 10892babe1f6SArnaldo Carvalho de Melo 10902babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 10912babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 10922babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 10932babe1f6SArnaldo Carvalho de Melo } 10942babe1f6SArnaldo Carvalho de Melo 10952babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 10962babe1f6SArnaldo Carvalho de Melo { 109759725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 10982babe1f6SArnaldo Carvalho de Melo 109959c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 110059c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 110159c2353dSArnaldo Carvalho de Melo return; 110259c2353dSArnaldo Carvalho de Melo 110359d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 11042babe1f6SArnaldo Carvalho de Melo 11052babe1f6SArnaldo Carvalho de Melo info->tcpi_rto = hctx->ccid3hctx_t_rto; 11062babe1f6SArnaldo Carvalho de Melo info->tcpi_rtt = hctx->ccid3hctx_rtt; 11072babe1f6SArnaldo Carvalho de Melo } 11082babe1f6SArnaldo Carvalho de Melo 110988f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 111088f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 111188f964dbSArnaldo Carvalho de Melo { 111288f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 111388f964dbSArnaldo Carvalho de Melo const void *val; 111488f964dbSArnaldo Carvalho de Melo 111588f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 111688f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 111788f964dbSArnaldo Carvalho de Melo return -EINVAL; 111888f964dbSArnaldo Carvalho de Melo 111988f964dbSArnaldo Carvalho de Melo switch (optname) { 112088f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 112188f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 112288f964dbSArnaldo Carvalho de Melo return -EINVAL; 112388f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 112488f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 112588f964dbSArnaldo Carvalho de Melo break; 112688f964dbSArnaldo Carvalho de Melo default: 112788f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 112888f964dbSArnaldo Carvalho de Melo } 112988f964dbSArnaldo Carvalho de Melo 113088f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 113188f964dbSArnaldo Carvalho de Melo return -EFAULT; 113288f964dbSArnaldo Carvalho de Melo 113388f964dbSArnaldo Carvalho de Melo return 0; 113488f964dbSArnaldo Carvalho de Melo } 113588f964dbSArnaldo Carvalho de Melo 113688f964dbSArnaldo Carvalho de Melo static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 113788f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 113888f964dbSArnaldo Carvalho de Melo { 113988f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 114088f964dbSArnaldo Carvalho de Melo const void *val; 114188f964dbSArnaldo Carvalho de Melo 114288f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 114388f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 114488f964dbSArnaldo Carvalho de Melo return -EINVAL; 114588f964dbSArnaldo Carvalho de Melo 114688f964dbSArnaldo Carvalho de Melo switch (optname) { 114788f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_TX_INFO: 114888f964dbSArnaldo Carvalho de Melo if (len < sizeof(hctx->ccid3hctx_tfrc)) 114988f964dbSArnaldo Carvalho de Melo return -EINVAL; 115088f964dbSArnaldo Carvalho de Melo len = sizeof(hctx->ccid3hctx_tfrc); 115188f964dbSArnaldo Carvalho de Melo val = &hctx->ccid3hctx_tfrc; 115288f964dbSArnaldo Carvalho de Melo break; 115388f964dbSArnaldo Carvalho de Melo default: 115488f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 115588f964dbSArnaldo Carvalho de Melo } 115688f964dbSArnaldo Carvalho de Melo 115788f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 115888f964dbSArnaldo Carvalho de Melo return -EFAULT; 115988f964dbSArnaldo Carvalho de Melo 116088f964dbSArnaldo Carvalho de Melo return 0; 116188f964dbSArnaldo Carvalho de Melo } 116288f964dbSArnaldo Carvalho de Melo 116391f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 11643dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 11657c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 11667c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 116791f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 11687c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 11697c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 11707c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 11717c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 11727c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 11737c657876SArnaldo Carvalho de Melo .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, 11747c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 117591f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 11767c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 11777c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 11787c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 11797c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 11802babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 11812babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 118288f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 118388f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 11847c657876SArnaldo Carvalho de Melo }; 11857c657876SArnaldo Carvalho de Melo 118656724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 11877c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 11887c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 118956724aa4SGerrit Renker #endif 11907c657876SArnaldo Carvalho de Melo 11917c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 11927c657876SArnaldo Carvalho de Melo { 11938c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 11947c657876SArnaldo Carvalho de Melo 11958c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 11968c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 11977c657876SArnaldo Carvalho de Melo goto out; 11987c657876SArnaldo Carvalho de Melo 11998c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 12008c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 12018c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 12027c657876SArnaldo Carvalho de Melo 1203ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = dccp_li_hist_new("ccid3"); 1204ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist == NULL) 12058c60f3faSArnaldo Carvalho de Melo goto out_free_tx; 12067c657876SArnaldo Carvalho de Melo 12077c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 12087c657876SArnaldo Carvalho de Melo if (rc != 0) 12097c657876SArnaldo Carvalho de Melo goto out_free_loss_interval_history; 12107c657876SArnaldo Carvalho de Melo out: 12117c657876SArnaldo Carvalho de Melo return rc; 12128c60f3faSArnaldo Carvalho de Melo 12137c657876SArnaldo Carvalho de Melo out_free_loss_interval_history: 1214ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1215ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12168c60f3faSArnaldo Carvalho de Melo out_free_tx: 12178c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12188c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12198c60f3faSArnaldo Carvalho de Melo out_free_rx: 12208c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12218c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12227c657876SArnaldo Carvalho de Melo goto out; 12237c657876SArnaldo Carvalho de Melo } 12247c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 12257c657876SArnaldo Carvalho de Melo 12267c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 12277c657876SArnaldo Carvalho de Melo { 12287c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 12297c657876SArnaldo Carvalho de Melo 12308c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 12318c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12328c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12337c657876SArnaldo Carvalho de Melo } 12348c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 12358c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12368c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12377c657876SArnaldo Carvalho de Melo } 1238ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist != NULL) { 1239ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1240ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12417c657876SArnaldo Carvalho de Melo } 12427c657876SArnaldo Carvalho de Melo } 12437c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 12447c657876SArnaldo Carvalho de Melo 1245e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 12461f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 12477c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 12487c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 12497c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1250