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) 1245c3fbb6aSGerrit Renker * 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; 1305c3fbb6aSGerrit Renker * 1315c3fbb6aSGerrit Renker * If X has changed, we also update the scheduled send time t_now, 1325c3fbb6aSGerrit Renker * the inter-packet interval t_ipi, and the delta value. 1337c657876SArnaldo Carvalho de Melo */ 134a79ef76fSGerrit Renker static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now) 135a79ef76fSGerrit Renker 1367c657876SArnaldo Carvalho de Melo { 13759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 13817893bc1SGerrit Renker const __u32 old_x = hctx->ccid3hctx_x; 1397c657876SArnaldo Carvalho de Melo 14044158306SGerrit Renker if (hctx->ccid3hctx_p > 0) { 14136729c1aSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, 1427c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, 1437c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p); 144a79ef76fSGerrit Renker hctx->ccid3hctx_x = max_t(u32, min(hctx->ccid3hctx_x_calc, 145a79ef76fSGerrit Renker hctx->ccid3hctx_x_recv * 2), 146a79ef76fSGerrit Renker hctx->ccid3hctx_s / TFRC_T_MBI); 147b6ee3d4aSArnaldo Carvalho de Melo 148a79ef76fSGerrit Renker } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) >= 149b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt) { 150a79ef76fSGerrit Renker hctx->ccid3hctx_x = max(min(hctx->ccid3hctx_x_recv, 1516b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x ) * 2, 1526b5e633aSArnaldo Carvalho de Melo usecs_div(hctx->ccid3hctx_s, 1536b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt) ); 154a79ef76fSGerrit Renker hctx->ccid3hctx_t_ld = *now; 155a79ef76fSGerrit Renker } else 156a79ef76fSGerrit Renker ccid3_pr_debug("Not changing X\n"); 157a79ef76fSGerrit Renker 15817893bc1SGerrit Renker if (hctx->ccid3hctx_x != old_x) 15917893bc1SGerrit Renker ccid3_update_send_time(hctx); 1607c657876SArnaldo Carvalho de Melo } 1617c657876SArnaldo Carvalho de Melo 16278ad713dSGerrit Renker /* 16378ad713dSGerrit Renker * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) 16478ad713dSGerrit Renker * @len: DCCP packet payload size in bytes 16578ad713dSGerrit Renker */ 16678ad713dSGerrit Renker static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) 16778ad713dSGerrit Renker { 16878ad713dSGerrit Renker if (unlikely(len == 0)) 16978ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 17078ad713dSGerrit Renker else 17178ad713dSGerrit Renker hctx->ccid3hctx_s = hctx->ccid3hctx_s == 0 ? len : 17278ad713dSGerrit Renker (9 * hctx->ccid3hctx_s + len) / 10; 17378ad713dSGerrit Renker /* 17478ad713dSGerrit Renker * Note: We could do a potential optimisation here - when `s' changes, 17578ad713dSGerrit Renker * recalculate sending rate and consequently t_ipi, t_delta, and 17678ad713dSGerrit Renker * t_now. This is however non-standard, and the benefits are not 17778ad713dSGerrit Renker * clear, so it is currently left out. 17878ad713dSGerrit Renker */ 17978ad713dSGerrit Renker } 18078ad713dSGerrit Renker 1817c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 1827c657876SArnaldo Carvalho de Melo { 1837c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 18459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1852a1fda6fSGerrit Renker unsigned long t_nfb = USEC_PER_SEC / 5; 1867c657876SArnaldo Carvalho de Melo 1877c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 1887c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 1897c657876SArnaldo Carvalho de Melo /* Try again later. */ 1907c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 19148e03eeeSGerrit Renker goto restart_timer; 1927c657876SArnaldo Carvalho de Melo } 1937c657876SArnaldo Carvalho de Melo 1947c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, 1957c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 1967c657876SArnaldo Carvalho de Melo 1977c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 1987c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 199a79ef76fSGerrit Renker /* RFC 3448, 4.4: Halve send rate directly */ 200a79ef76fSGerrit Renker hctx->ccid3hctx_x = min_t(u32, hctx->ccid3hctx_x / 2, 201a79ef76fSGerrit Renker hctx->ccid3hctx_s / TFRC_T_MBI); 2027c657876SArnaldo Carvalho de Melo 2031f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " 2041f2333aeSArnaldo Carvalho de Melo "bytes/s\n", 2051f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2061f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 2077c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x); 20848e03eeeSGerrit Renker /* The value of R is still undefined and so we can not recompute 20948e03eeeSGerrit Renker * the timout value. Keep initial value as per [RFC 4342, 5]. */ 2102a1fda6fSGerrit Renker t_nfb = TFRC_INITIAL_TIMEOUT; 21117893bc1SGerrit Renker ccid3_update_send_time(hctx); 2127c657876SArnaldo Carvalho de Melo break; 2137c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 2141f2333aeSArnaldo Carvalho de Melo /* 2151f2333aeSArnaldo Carvalho de Melo * Check if IDLE since last timeout and recv rate is less than 2161f2333aeSArnaldo Carvalho de Melo * 4 packets per RTT 2171f2333aeSArnaldo Carvalho de Melo */ 2181f2333aeSArnaldo Carvalho de Melo if (!hctx->ccid3hctx_idle || 2196b5e633aSArnaldo Carvalho de Melo (hctx->ccid3hctx_x_recv >= 2206b5e633aSArnaldo Carvalho de Melo 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { 221a79ef76fSGerrit Renker struct timeval now; 222a79ef76fSGerrit Renker 2231f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", 2241f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2257c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2267c657876SArnaldo Carvalho de Melo /* Halve sending rate */ 2277c657876SArnaldo Carvalho de Melo 22844158306SGerrit Renker /* If (p == 0 || X_calc > 2 * X_recv) 2297c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2307c657876SArnaldo Carvalho de Melo * Else 2317c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2327c657876SArnaldo Carvalho de Melo */ 23344158306SGerrit Renker BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); 2347c657876SArnaldo Carvalho de Melo 23544158306SGerrit Renker if (hctx->ccid3hctx_p == 0 || 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; 4167c657876SArnaldo Carvalho de Melo u32 pinv; 4175c3fbb6aSGerrit Renker long r_sample, t_elapsed; 4181f2333aeSArnaldo Carvalho de Melo 41959348b19SGerrit Renker BUG_ON(hctx == NULL); 4207c657876SArnaldo Carvalho de Melo 4217c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4227c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4237c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4247c657876SArnaldo Carvalho de Melo return; 4257c657876SArnaldo Carvalho de Melo 4267c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4277c657876SArnaldo Carvalho de Melo 4287c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4297c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4307c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4315c3fbb6aSGerrit Renker /* get packet from history to look up t_recvdata */ 4328c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4338c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 43459d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 4355c3fbb6aSGerrit Renker DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " 43659348b19SGerrit Renker "in history!\n", dccp_role(sk), sk, 43759d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4387c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4397c657876SArnaldo Carvalho de Melo return; 4407c657876SArnaldo Carvalho de Melo } 4417c657876SArnaldo Carvalho de Melo 4425c3fbb6aSGerrit Renker /* Update receive rate */ 4435c3fbb6aSGerrit Renker hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; 4445c3fbb6aSGerrit Renker 4455c3fbb6aSGerrit Renker /* Update loss event rate */ 4465c3fbb6aSGerrit Renker pinv = opt_recv->ccid3or_loss_event_rate; 4475c3fbb6aSGerrit Renker if (pinv == ~0U || pinv == 0) 4485c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 0; 44944158306SGerrit Renker else 4505c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 1000000 / pinv; 4515c3fbb6aSGerrit Renker 452b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 4535c3fbb6aSGerrit Renker 4545c3fbb6aSGerrit Renker /* 4555c3fbb6aSGerrit Renker * Calculate new round trip sample as per [RFC 3448, 4.3] by 4565c3fbb6aSGerrit Renker * R_sample = (now - t_recvdata) - t_elapsed 4575c3fbb6aSGerrit Renker */ 458b0e56780SArnaldo Carvalho de Melo r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); 4595c3fbb6aSGerrit Renker t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; 4605c3fbb6aSGerrit Renker 4615c3fbb6aSGerrit Renker if (unlikely(r_sample <= 0)) { 4625c3fbb6aSGerrit Renker DCCP_WARN("WARNING: R_sample (%ld) <= 0!\n", r_sample); 4635c3fbb6aSGerrit Renker r_sample = 0; 4645c3fbb6aSGerrit Renker } else if (unlikely(r_sample <= t_elapsed)) 4655c3fbb6aSGerrit Renker DCCP_WARN("WARNING: r_sample=%ldus <= t_elapsed=%ldus\n", 46659348b19SGerrit Renker r_sample, t_elapsed); 4671a28599aSArnaldo Carvalho de Melo else 4681a28599aSArnaldo Carvalho de Melo r_sample -= t_elapsed; 4697c657876SArnaldo Carvalho de Melo 4707c657876SArnaldo Carvalho de Melo /* Update RTT estimate by 4717c657876SArnaldo Carvalho de Melo * If (No feedback recv) 4727c657876SArnaldo Carvalho de Melo * R = R_sample; 4737c657876SArnaldo Carvalho de Melo * Else 4747c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 4757c657876SArnaldo Carvalho de Melo * 4767c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 4777c657876SArnaldo Carvalho de Melo */ 4787c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 479a79ef76fSGerrit Renker /* Use Larger Initial Windows [RFC 4342, sec. 5] 480a79ef76fSGerrit Renker * We deviate in that we use `s' instead of `MSS'. */ 481a79ef76fSGerrit Renker u16 w_init = max( 4 * hctx->ccid3hctx_s, 482a79ef76fSGerrit Renker max(2 * hctx->ccid3hctx_s, 4380)); 4837c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 484a79ef76fSGerrit Renker hctx->ccid3hctx_x = usecs_div(w_init, r_sample); 485a79ef76fSGerrit Renker hctx->ccid3hctx_t_ld = now; 486a79ef76fSGerrit Renker 487a79ef76fSGerrit Renker ccid3_update_send_time(hctx); 4885c3fbb6aSGerrit Renker 4895c3fbb6aSGerrit Renker ccid3_pr_debug("%s(%p), s=%u, w_init=%u, " 4905c3fbb6aSGerrit Renker "R_sample=%ldus, X=%u\n", dccp_role(sk), 4915c3fbb6aSGerrit Renker sk, hctx->ccid3hctx_s, w_init, r_sample, 4925c3fbb6aSGerrit Renker hctx->ccid3hctx_x); 4935c3fbb6aSGerrit Renker 494a79ef76fSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 495a79ef76fSGerrit Renker } else { 4965c3fbb6aSGerrit Renker hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + 4975c3fbb6aSGerrit Renker (u32)r_sample ) / 10; 4985c3fbb6aSGerrit Renker 499a79ef76fSGerrit Renker ccid3_hc_tx_update_x(sk, &now); 5007c657876SArnaldo Carvalho de Melo 5015c3fbb6aSGerrit Renker ccid3_pr_debug("%s(%p), RTT=%uus (sample=%ldus), s=%u, " 5025c3fbb6aSGerrit Renker "p=%u, X_calc=%u, X=%u\n", dccp_role(sk), 5035c3fbb6aSGerrit Renker sk, hctx->ccid3hctx_rtt, r_sample, 5045c3fbb6aSGerrit Renker hctx->ccid3hctx_s, hctx->ccid3hctx_p, 5055c3fbb6aSGerrit Renker hctx->ccid3hctx_x_calc, 5065c3fbb6aSGerrit Renker hctx->ccid3hctx_x); 5077c657876SArnaldo Carvalho de Melo } 5087c657876SArnaldo Carvalho de Melo 5097c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 5107c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5117c657876SArnaldo Carvalho de Melo 5127c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5138c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5148c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 515c530cfb1SArnaldo Carvalho de Melo /* 516c530cfb1SArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible that 5175d0dbc4aSGerrit Renker * we now can send a packet, so wake up dccp_wait_for_ccid 518c530cfb1SArnaldo Carvalho de Melo */ 519c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5208c60f3faSArnaldo Carvalho de Melo 5218a508ac2SGerrit Renker /* 5228a508ac2SGerrit Renker * Update timeout interval for the nofeedback timer. 5238a508ac2SGerrit Renker * We use a configuration option to increase the lower bound. 5248a508ac2SGerrit Renker * This can help avoid triggering the nofeedback timer too often 5258a508ac2SGerrit Renker * ('spinning') on LANs with small RTTs. 5268a508ac2SGerrit Renker */ 5275d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 5288a508ac2SGerrit Renker CONFIG_IP_DCCP_CCID3_RTO * 5298a508ac2SGerrit Renker (USEC_PER_SEC/1000) ); 5301f2333aeSArnaldo Carvalho de Melo /* 5311f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5328a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 5331f2333aeSArnaldo Carvalho de Melo */ 5348a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 5357c657876SArnaldo Carvalho de Melo 5361f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " 5371f2333aeSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5381f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 5392a1fda6fSGerrit Renker usecs_to_jiffies(t_nfb), t_nfb); 5407c657876SArnaldo Carvalho de Melo 5417c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5422a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 5437c657876SArnaldo Carvalho de Melo 5447c657876SArnaldo Carvalho de Melo /* set idle flag */ 5457c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5467c657876SArnaldo Carvalho de Melo break; 5475e19e3fcSGerrit Renker case TFRC_SSTATE_NO_SENT: 54826af3072SGerrit Renker if (dccp_sk(sk)->dccps_role == DCCP_ROLE_CLIENT) 54926af3072SGerrit Renker DCCP_WARN("Illegal ACK received - no packet sent\n"); 5505e19e3fcSGerrit Renker /* fall through */ 5515e19e3fcSGerrit Renker case TFRC_SSTATE_TERM: /* ignore feedback when closing */ 5527c657876SArnaldo Carvalho de Melo break; 5537c657876SArnaldo Carvalho de Melo } 5547c657876SArnaldo Carvalho de Melo } 5557c657876SArnaldo Carvalho de Melo 5562d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) 5577c657876SArnaldo Carvalho de Melo { 55859d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5597c657876SArnaldo Carvalho de Melo 56059d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 56159d203f9SArnaldo Carvalho de Melo 5622d0817d1SArnaldo Carvalho de Melo if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) 5637c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 5642d0817d1SArnaldo Carvalho de Melo return 0; 5657c657876SArnaldo Carvalho de Melo } 5667c657876SArnaldo Carvalho de Melo 5677c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5681f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5691f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5707c657876SArnaldo Carvalho de Melo { 5717c657876SArnaldo Carvalho de Melo int rc = 0; 57259725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 57359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5747c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 5757c657876SArnaldo Carvalho de Melo 57659d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 5777c657876SArnaldo Carvalho de Melo 5787c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5797c657876SArnaldo Carvalho de Melo 5807c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5817c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5827c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5837c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5847c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5857c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5867c657876SArnaldo Carvalho de Melo } 5877c657876SArnaldo Carvalho de Melo 5887c657876SArnaldo Carvalho de Melo switch (option) { 5897c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 59059d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 59159348b19SGerrit Renker DCCP_WARN("%s, sk=%p, invalid len %d " 59259348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 59359348b19SGerrit Renker dccp_role(sk), sk, len); 5947c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5957c657876SArnaldo Carvalho de Melo } else { 59660fe62e7SAndrea Bittau opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); 5977c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", 5987c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5997c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 6007c657876SArnaldo Carvalho de Melo } 6017c657876SArnaldo Carvalho de Melo break; 6027c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 6037c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 6047c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 6057c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", 6067c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6077c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 6087c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 6097c657876SArnaldo Carvalho de Melo break; 6107c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 61159d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 61259348b19SGerrit Renker DCCP_WARN("%s, sk=%p, invalid len %d " 61359348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 61459348b19SGerrit Renker dccp_role(sk), sk, len); 6157c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6167c657876SArnaldo Carvalho de Melo } else { 61760fe62e7SAndrea Bittau opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); 6187c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", 6197c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6207c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 6217c657876SArnaldo Carvalho de Melo } 6227c657876SArnaldo Carvalho de Melo break; 6237c657876SArnaldo Carvalho de Melo } 6247c657876SArnaldo Carvalho de Melo 6257c657876SArnaldo Carvalho de Melo return rc; 6267c657876SArnaldo Carvalho de Melo } 6277c657876SArnaldo Carvalho de Melo 62891f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 6297c657876SArnaldo Carvalho de Melo { 63091f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 6317c657876SArnaldo Carvalho de Melo 63278ad713dSGerrit Renker hctx->ccid3hctx_s = 0; 6337c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6347c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 635aa5d7df3SArnaldo Carvalho de Melo 636aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; 637aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 6387c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6397c657876SArnaldo Carvalho de Melo 6407c657876SArnaldo Carvalho de Melo return 0; 6417c657876SArnaldo Carvalho de Melo } 6427c657876SArnaldo Carvalho de Melo 6437c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6447c657876SArnaldo Carvalho de Melo { 64559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6467c657876SArnaldo Carvalho de Melo 6477c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 6487c657876SArnaldo Carvalho de Melo 6497c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6507c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6517c657876SArnaldo Carvalho de Melo 6527c657876SArnaldo Carvalho de Melo /* Empty packet history */ 6538c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 6547c657876SArnaldo Carvalho de Melo } 6557c657876SArnaldo Carvalho de Melo 6567c657876SArnaldo Carvalho de Melo /* 6577c657876SArnaldo Carvalho de Melo * RX Half Connection methods 6587c657876SArnaldo Carvalho de Melo */ 6597c657876SArnaldo Carvalho de Melo 66056724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6617c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6627c657876SArnaldo Carvalho de Melo { 6637c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6647c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6657c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6667c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6677c657876SArnaldo Carvalho de Melo }; 6687c657876SArnaldo Carvalho de Melo 6697c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6707c657876SArnaldo Carvalho de Melo } 6717c657876SArnaldo Carvalho de Melo #endif 6727c657876SArnaldo Carvalho de Melo 673c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 6741f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 6757c657876SArnaldo Carvalho de Melo { 67659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6777c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 6787c657876SArnaldo Carvalho de Melo 6797c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 6801f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 6811f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 6827c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 6837c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 6847c657876SArnaldo Carvalho de Melo } 6857c657876SArnaldo Carvalho de Melo 68678ad713dSGerrit Renker static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) 68778ad713dSGerrit Renker { 68878ad713dSGerrit Renker if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ 68978ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 69078ad713dSGerrit Renker else 69178ad713dSGerrit Renker hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : 69278ad713dSGerrit Renker (9 * hcrx->ccid3hcrx_s + len) / 10; 69378ad713dSGerrit Renker } 69478ad713dSGerrit Renker 6957c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 6967c657876SArnaldo Carvalho de Melo { 69759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6987c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 6998c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 700b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 7017c657876SArnaldo Carvalho de Melo 7027c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 7037c657876SArnaldo Carvalho de Melo 704b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 705b6ee3d4aSArnaldo Carvalho de Melo 7067c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 7077c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 7087c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 7097c657876SArnaldo Carvalho de Melo break; 7107c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: { 711b6ee3d4aSArnaldo Carvalho de Melo const u32 delta = timeval_delta(&now, 712b6ee3d4aSArnaldo Carvalho de Melo &hcrx->ccid3hcrx_tstamp_last_feedback); 71327ae543eSArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, 71427ae543eSArnaldo Carvalho de Melo delta); 7157c657876SArnaldo Carvalho de Melo } 7167c657876SArnaldo Carvalho de Melo break; 71759348b19SGerrit Renker case TFRC_RSTATE_TERM: 71859348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 7197c657876SArnaldo Carvalho de Melo return; 7207c657876SArnaldo Carvalho de Melo } 7217c657876SArnaldo Carvalho de Melo 7228c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 72359d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 72459348b19SGerrit Renker DCCP_WARN("%s, sk=%p, no data packet in history!\n", 72559348b19SGerrit Renker dccp_role(sk), sk); 7267c657876SArnaldo Carvalho de Melo return; 7277c657876SArnaldo Carvalho de Melo } 7287c657876SArnaldo Carvalho de Melo 729b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 73066a377c5SIan McDonald hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; 7317c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7327c657876SArnaldo Carvalho de Melo 7337c657876SArnaldo Carvalho de Melo /* Convert to multiples of 10us */ 734b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time = 735b6ee3d4aSArnaldo Carvalho de Melo timeval_delta(&now, &packet->dccphrx_tstamp) / 10; 7367c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 7377c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = ~0; 7387c657876SArnaldo Carvalho de Melo else 7397c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 740507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7417c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7427c657876SArnaldo Carvalho de Melo } 7437c657876SArnaldo Carvalho de Melo 7442d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7457c657876SArnaldo Carvalho de Melo { 74659d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 74760fe62e7SAndrea Bittau __be32 x_recv, pinv; 7487c657876SArnaldo Carvalho de Melo 74959d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 75059d203f9SArnaldo Carvalho de Melo 75159d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7522d0817d1SArnaldo Carvalho de Melo return 0; 7537c657876SArnaldo Carvalho de Melo 75466a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 7554fded33bSArnaldo Carvalho de Melo 7564fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7572d0817d1SArnaldo Carvalho de Melo return 0; 7584fded33bSArnaldo Carvalho de Melo 7594fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7604fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7612d0817d1SArnaldo Carvalho de Melo 7622d0817d1SArnaldo Carvalho de Melo if ((hcrx->ccid3hcrx_elapsed_time != 0 && 7632d0817d1SArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 7642d0817d1SArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time)) || 7652d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb) || 7664fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7672d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7684fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 7692d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 7702d0817d1SArnaldo Carvalho de Melo return -1; 7712d0817d1SArnaldo Carvalho de Melo 7722d0817d1SArnaldo Carvalho de Melo return 0; 7737c657876SArnaldo Carvalho de Melo } 7747c657876SArnaldo Carvalho de Melo 7757c657876SArnaldo Carvalho de Melo /* calculate first loss interval 7767c657876SArnaldo Carvalho de Melo * 7777c657876SArnaldo Carvalho de Melo * returns estimated loss interval in usecs */ 7787c657876SArnaldo Carvalho de Melo 7797c657876SArnaldo Carvalho de Melo static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) 7807c657876SArnaldo Carvalho de Melo { 78159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7828c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *entry, *next, *tail = NULL; 7837c657876SArnaldo Carvalho de Melo u32 rtt, delta, x_recv, fval, p, tmp2; 784b6ee3d4aSArnaldo Carvalho de Melo struct timeval tstamp = { 0, }; 7857c657876SArnaldo Carvalho de Melo int interval = 0; 7867c657876SArnaldo Carvalho de Melo int win_count = 0; 7877c657876SArnaldo Carvalho de Melo int step = 0; 7887c657876SArnaldo Carvalho de Melo u64 tmp1; 7897c657876SArnaldo Carvalho de Melo 7908c60f3faSArnaldo Carvalho de Melo list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, 7918c60f3faSArnaldo Carvalho de Melo dccphrx_node) { 7928c60f3faSArnaldo Carvalho de Melo if (dccp_rx_hist_entry_data_packet(entry)) { 7937c657876SArnaldo Carvalho de Melo tail = entry; 7947c657876SArnaldo Carvalho de Melo 7957c657876SArnaldo Carvalho de Melo switch (step) { 7967c657876SArnaldo Carvalho de Melo case 0: 7978c60f3faSArnaldo Carvalho de Melo tstamp = entry->dccphrx_tstamp; 798c1734376SArnaldo Carvalho de Melo win_count = entry->dccphrx_ccval; 7997c657876SArnaldo Carvalho de Melo step = 1; 8007c657876SArnaldo Carvalho de Melo break; 8017c657876SArnaldo Carvalho de Melo case 1: 802c1734376SArnaldo Carvalho de Melo interval = win_count - entry->dccphrx_ccval; 8037c657876SArnaldo Carvalho de Melo if (interval < 0) 8047c657876SArnaldo Carvalho de Melo interval += TFRC_WIN_COUNT_LIMIT; 8057c657876SArnaldo Carvalho de Melo if (interval > 4) 8067c657876SArnaldo Carvalho de Melo goto found; 8077c657876SArnaldo Carvalho de Melo break; 8087c657876SArnaldo Carvalho de Melo } 8097c657876SArnaldo Carvalho de Melo } 8107c657876SArnaldo Carvalho de Melo } 8117c657876SArnaldo Carvalho de Melo 81259d203f9SArnaldo Carvalho de Melo if (unlikely(step == 0)) { 81359348b19SGerrit Renker DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", 81459348b19SGerrit Renker dccp_role(sk), sk); 8157c657876SArnaldo Carvalho de Melo return ~0; 8167c657876SArnaldo Carvalho de Melo } 8177c657876SArnaldo Carvalho de Melo 81859d203f9SArnaldo Carvalho de Melo if (unlikely(interval == 0)) { 81959348b19SGerrit Renker DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." 82059348b19SGerrit Renker "Defaulting to 1\n", dccp_role(sk), sk); 8217c657876SArnaldo Carvalho de Melo interval = 1; 8227c657876SArnaldo Carvalho de Melo } 8237c657876SArnaldo Carvalho de Melo found: 82466a377c5SIan McDonald if (!tail) { 82559348b19SGerrit Renker DCCP_CRIT("tail is null\n"); 82666a377c5SIan McDonald return ~0; 82766a377c5SIan McDonald } 828b6ee3d4aSArnaldo Carvalho de Melo rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; 8297c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", 8307c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, rtt); 83159348b19SGerrit Renker 83259348b19SGerrit Renker if (rtt == 0) { 83359348b19SGerrit Renker DCCP_WARN("RTT==0, setting to 1\n"); 8347c657876SArnaldo Carvalho de Melo rtt = 1; 83559348b19SGerrit Renker } 8367c657876SArnaldo Carvalho de Melo 837b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &tstamp); 838b0e56780SArnaldo Carvalho de Melo delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); 839b0e56780SArnaldo Carvalho de Melo x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); 8407c657876SArnaldo Carvalho de Melo 84166a377c5SIan McDonald if (x_recv == 0) 84266a377c5SIan McDonald x_recv = hcrx->ccid3hcrx_x_recv; 84366a377c5SIan McDonald 8447c657876SArnaldo Carvalho de Melo tmp1 = (u64)x_recv * (u64)rtt; 8457c657876SArnaldo Carvalho de Melo do_div(tmp1,10000000); 8467c657876SArnaldo Carvalho de Melo tmp2 = (u32)tmp1; 84766a377c5SIan McDonald 84866a377c5SIan McDonald if (!tmp2) { 84959348b19SGerrit Renker DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv, rtt); 85066a377c5SIan McDonald return ~0; 85166a377c5SIan McDonald } 85266a377c5SIan McDonald 8537c657876SArnaldo Carvalho de Melo fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; 8547c657876SArnaldo Carvalho de Melo /* do not alter order above or you will get overflow on 32 bit */ 85536729c1aSArnaldo Carvalho de Melo p = tfrc_calc_x_reverse_lookup(fval); 8561f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " 8571f2333aeSArnaldo Carvalho de Melo "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 8587c657876SArnaldo Carvalho de Melo 8597c657876SArnaldo Carvalho de Melo if (p == 0) 8607c657876SArnaldo Carvalho de Melo return ~0; 8617c657876SArnaldo Carvalho de Melo else 8627c657876SArnaldo Carvalho de Melo return 1000000 / p; 8637c657876SArnaldo Carvalho de Melo } 8647c657876SArnaldo Carvalho de Melo 8657c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) 8667c657876SArnaldo Carvalho de Melo { 86759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 868fc747e82SIan McDonald struct dccp_li_hist_entry *head; 86966a377c5SIan McDonald u64 seq_temp; 8707c657876SArnaldo Carvalho de Melo 87166a377c5SIan McDonald if (list_empty(&hcrx->ccid3hcrx_li_hist)) { 87266a377c5SIan McDonald if (!dccp_li_hist_interval_new(ccid3_li_hist, 87366a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) 874ae6706f0SArnaldo Carvalho de Melo return; 87566a377c5SIan McDonald 876fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 877fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 878fc747e82SIan McDonald head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); 87966a377c5SIan McDonald } else { 88066a377c5SIan McDonald struct dccp_li_hist_entry *entry; 88166a377c5SIan McDonald struct list_head *tail; 88266a377c5SIan McDonald 883fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 884fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 88566a377c5SIan McDonald /* FIXME win count check removed as was wrong */ 88666a377c5SIan McDonald /* should make this check with receive history */ 88766a377c5SIan McDonald /* and compare there as per section 10.2 of RFC4342 */ 88866a377c5SIan McDonald 88966a377c5SIan McDonald /* new loss event detected */ 89066a377c5SIan McDonald /* calculate last interval length */ 89166a377c5SIan McDonald seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); 89266a377c5SIan McDonald entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); 89366a377c5SIan McDonald 89466a377c5SIan McDonald if (entry == NULL) { 89559348b19SGerrit Renker DCCP_BUG("out of memory - can not allocate entry"); 89666a377c5SIan McDonald return; 8977c657876SArnaldo Carvalho de Melo } 8987c657876SArnaldo Carvalho de Melo 89966a377c5SIan McDonald list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); 90066a377c5SIan McDonald 90166a377c5SIan McDonald tail = hcrx->ccid3hcrx_li_hist.prev; 90266a377c5SIan McDonald list_del(tail); 90366a377c5SIan McDonald kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); 90466a377c5SIan McDonald 90566a377c5SIan McDonald /* Create the newest interval */ 90666a377c5SIan McDonald entry->dccplih_seqno = seq_loss; 90766a377c5SIan McDonald entry->dccplih_interval = seq_temp; 90866a377c5SIan McDonald entry->dccplih_win_count = win_loss; 90966a377c5SIan McDonald } 91066a377c5SIan McDonald } 91166a377c5SIan McDonald 91266a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 91366a377c5SIan McDonald struct dccp_rx_hist_entry *packet) 9147c657876SArnaldo Carvalho de Melo { 91559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 91666a377c5SIan McDonald struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); 91766a377c5SIan McDonald u64 seqno = packet->dccphrx_seqno; 91866a377c5SIan McDonald u64 tmp_seqno; 91966a377c5SIan McDonald int loss = 0; 92066a377c5SIan McDonald u8 ccval; 9217c657876SArnaldo Carvalho de Melo 92266a377c5SIan McDonald 92366a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 92466a377c5SIan McDonald 92566a377c5SIan McDonald if (!rx_hist || 92666a377c5SIan McDonald follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 92766a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 92866a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 92966a377c5SIan McDonald goto detect_out; 93066a377c5SIan McDonald } 93166a377c5SIan McDonald 93266a377c5SIan McDonald 93366a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 93466a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 93566a377c5SIan McDonald loss = 1; 93666a377c5SIan McDonald ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, 93766a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 93866a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 93966a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 94066a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 94166a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 94266a377c5SIan McDonald while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 94366a377c5SIan McDonald tmp_seqno, &ccval)) { 94466a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 94566a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 94666a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 94766a377c5SIan McDonald } 94866a377c5SIan McDonald } 94966a377c5SIan McDonald 95066a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 95166a377c5SIan McDonald /* but works at moment */ 95266a377c5SIan McDonald if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 95366a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 95466a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 95566a377c5SIan McDonald } 95666a377c5SIan McDonald 95766a377c5SIan McDonald detect_out: 95866a377c5SIan McDonald dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 95966a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 96066a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 96166a377c5SIan McDonald return loss; 9627c657876SArnaldo Carvalho de Melo } 9637c657876SArnaldo Carvalho de Melo 9647c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 9657c657876SArnaldo Carvalho de Melo { 96659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9674fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 9688c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 9697c657876SArnaldo Carvalho de Melo struct timeval now; 97066a377c5SIan McDonald u32 p_prev, rtt_prev, r_sample, t_elapsed; 97178ad713dSGerrit Renker int loss, payload_size; 9721f2333aeSArnaldo Carvalho de Melo 97359348b19SGerrit Renker BUG_ON(hcrx == NULL); 9747c657876SArnaldo Carvalho de Melo 97559725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 9764fded33bSArnaldo Carvalho de Melo 9777c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 9787c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 9797c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 9807c657876SArnaldo Carvalho de Melo return; 9817c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 9824fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 9837c657876SArnaldo Carvalho de Melo break; 98466a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 985b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 986b3a3077dSArnaldo Carvalho de Melo timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); 987b3a3077dSArnaldo Carvalho de Melo r_sample = timeval_usecs(&now); 988b3a3077dSArnaldo Carvalho de Melo t_elapsed = opt_recv->dccpor_elapsed_time * 10; 989b3a3077dSArnaldo Carvalho de Melo 990b3a3077dSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 99159348b19SGerrit Renker DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", 99259348b19SGerrit Renker r_sample, t_elapsed); 993b3a3077dSArnaldo Carvalho de Melo else 994b3a3077dSArnaldo Carvalho de Melo r_sample -= t_elapsed; 995b3a3077dSArnaldo Carvalho de Melo 996b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 997b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 998b3a3077dSArnaldo Carvalho de Melo else 999b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 1000b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 1001b3a3077dSArnaldo Carvalho de Melo 100266a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 100366a377c5SIan McDonald ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", 10044fded33bSArnaldo Carvalho de Melo dccp_role(sk), hcrx->ccid3hcrx_rtt, 10054fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 10067c657876SArnaldo Carvalho de Melo break; 10077c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 10087c657876SArnaldo Carvalho de Melo break; 100959d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 10107c657876SArnaldo Carvalho de Melo return; 10117c657876SArnaldo Carvalho de Melo } 10127c657876SArnaldo Carvalho de Melo 1013b0e56780SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, 10148c60f3faSArnaldo Carvalho de Melo skb, SLAB_ATOMIC); 101559d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 101659348b19SGerrit Renker DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " 101759348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 10187c657876SArnaldo Carvalho de Melo return; 10197c657876SArnaldo Carvalho de Melo } 10207c657876SArnaldo Carvalho de Melo 102166a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 10227c657876SArnaldo Carvalho de Melo 10237c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 10247c657876SArnaldo Carvalho de Melo return; 10257c657876SArnaldo Carvalho de Melo 102678ad713dSGerrit Renker payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; 102778ad713dSGerrit Renker ccid3_hc_rx_update_s(hcrx, payload_size); 102878ad713dSGerrit Renker 10297c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 10307c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 10311f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " 10321f2333aeSArnaldo Carvalho de Melo "feedback\n", 10331f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 10341f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 10357c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10367c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 10377c657876SArnaldo Carvalho de Melo return; 10387c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 103978ad713dSGerrit Renker hcrx->ccid3hcrx_bytes_recv += payload_size; 104066a377c5SIan McDonald if (loss) 1041b6ee3d4aSArnaldo Carvalho de Melo break; 1042b6ee3d4aSArnaldo Carvalho de Melo 1043b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 1044b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= 10454fded33bSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt) { 1046b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 10477c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10487c657876SArnaldo Carvalho de Melo } 10497c657876SArnaldo Carvalho de Melo return; 105059348b19SGerrit Renker case TFRC_RSTATE_TERM: 105159348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 10527c657876SArnaldo Carvalho de Melo return; 10537c657876SArnaldo Carvalho de Melo } 10547c657876SArnaldo Carvalho de Melo 10557c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 10564fded33bSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", 10574fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 10587c657876SArnaldo Carvalho de Melo 10597c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 10607c657876SArnaldo Carvalho de Melo 10617c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 1062c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 1063c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 1064c0996660SIan McDonald 10657c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 1066c0996660SIan McDonald if (i_mean != 0) 1067c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 106859348b19SGerrit Renker } else 106959348b19SGerrit Renker DCCP_BUG("empty loss history"); 10707c657876SArnaldo Carvalho de Melo 10717c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 10727c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10737c657876SArnaldo Carvalho de Melo return; 10747c657876SArnaldo Carvalho de Melo } 10757c657876SArnaldo Carvalho de Melo } 10767c657876SArnaldo Carvalho de Melo 107791f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 10787c657876SArnaldo Carvalho de Melo { 107991f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 10807c657876SArnaldo Carvalho de Melo 10817c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 10827c657876SArnaldo Carvalho de Melo 10837c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 10847c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 1085ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 1086b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); 1087954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; 108878ad713dSGerrit Renker hcrx->ccid3hcrx_s = 0; 1089954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ 10907c657876SArnaldo Carvalho de Melo return 0; 10917c657876SArnaldo Carvalho de Melo } 10927c657876SArnaldo Carvalho de Melo 10937c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 10947c657876SArnaldo Carvalho de Melo { 109559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 10967c657876SArnaldo Carvalho de Melo 109759d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 10987c657876SArnaldo Carvalho de Melo 10997c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 11007c657876SArnaldo Carvalho de Melo 11017c657876SArnaldo Carvalho de Melo /* Empty packet history */ 11028c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 11037c657876SArnaldo Carvalho de Melo 11047c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 1105ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); 11067c657876SArnaldo Carvalho de Melo } 11077c657876SArnaldo Carvalho de Melo 11082babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 11092babe1f6SArnaldo Carvalho de Melo { 111059725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 11112babe1f6SArnaldo Carvalho de Melo 111259c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 111359c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 111459c2353dSArnaldo Carvalho de Melo return; 111559c2353dSArnaldo Carvalho de Melo 111659d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 11172babe1f6SArnaldo Carvalho de Melo 11182babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 11192babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 11202babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 11212babe1f6SArnaldo Carvalho de Melo } 11222babe1f6SArnaldo Carvalho de Melo 11232babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 11242babe1f6SArnaldo Carvalho de Melo { 112559725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 11262babe1f6SArnaldo Carvalho de Melo 112759c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 112859c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 112959c2353dSArnaldo Carvalho de Melo return; 113059c2353dSArnaldo Carvalho de Melo 113159d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 11322babe1f6SArnaldo Carvalho de Melo 11332babe1f6SArnaldo Carvalho de Melo info->tcpi_rto = hctx->ccid3hctx_t_rto; 11342babe1f6SArnaldo Carvalho de Melo info->tcpi_rtt = hctx->ccid3hctx_rtt; 11352babe1f6SArnaldo Carvalho de Melo } 11362babe1f6SArnaldo Carvalho de Melo 113788f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 113888f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 113988f964dbSArnaldo Carvalho de Melo { 114088f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 114188f964dbSArnaldo Carvalho de Melo const void *val; 114288f964dbSArnaldo Carvalho de Melo 114388f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 114488f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 114588f964dbSArnaldo Carvalho de Melo return -EINVAL; 114688f964dbSArnaldo Carvalho de Melo 114788f964dbSArnaldo Carvalho de Melo switch (optname) { 114888f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 114988f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 115088f964dbSArnaldo Carvalho de Melo return -EINVAL; 115188f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 115288f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 115388f964dbSArnaldo Carvalho de Melo break; 115488f964dbSArnaldo Carvalho de Melo default: 115588f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 115688f964dbSArnaldo Carvalho de Melo } 115788f964dbSArnaldo Carvalho de Melo 115888f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 115988f964dbSArnaldo Carvalho de Melo return -EFAULT; 116088f964dbSArnaldo Carvalho de Melo 116188f964dbSArnaldo Carvalho de Melo return 0; 116288f964dbSArnaldo Carvalho de Melo } 116388f964dbSArnaldo Carvalho de Melo 116488f964dbSArnaldo Carvalho de Melo static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 116588f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 116688f964dbSArnaldo Carvalho de Melo { 116788f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 116888f964dbSArnaldo Carvalho de Melo const void *val; 116988f964dbSArnaldo Carvalho de Melo 117088f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 117188f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 117288f964dbSArnaldo Carvalho de Melo return -EINVAL; 117388f964dbSArnaldo Carvalho de Melo 117488f964dbSArnaldo Carvalho de Melo switch (optname) { 117588f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_TX_INFO: 117688f964dbSArnaldo Carvalho de Melo if (len < sizeof(hctx->ccid3hctx_tfrc)) 117788f964dbSArnaldo Carvalho de Melo return -EINVAL; 117888f964dbSArnaldo Carvalho de Melo len = sizeof(hctx->ccid3hctx_tfrc); 117988f964dbSArnaldo Carvalho de Melo val = &hctx->ccid3hctx_tfrc; 118088f964dbSArnaldo Carvalho de Melo break; 118188f964dbSArnaldo Carvalho de Melo default: 118288f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 118388f964dbSArnaldo Carvalho de Melo } 118488f964dbSArnaldo Carvalho de Melo 118588f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 118688f964dbSArnaldo Carvalho de Melo return -EFAULT; 118788f964dbSArnaldo Carvalho de Melo 118888f964dbSArnaldo Carvalho de Melo return 0; 118988f964dbSArnaldo Carvalho de Melo } 119088f964dbSArnaldo Carvalho de Melo 119191f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 11923dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 11937c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 11947c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 119591f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 11967c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 11977c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 11987c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 11997c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 12007c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 12017c657876SArnaldo Carvalho de Melo .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, 12027c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 120391f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 12047c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 12057c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 12067c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 12077c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 12082babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 12092babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 121088f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 121188f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 12127c657876SArnaldo Carvalho de Melo }; 12137c657876SArnaldo Carvalho de Melo 121456724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 12157c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 12167c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 121756724aa4SGerrit Renker #endif 12187c657876SArnaldo Carvalho de Melo 12197c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 12207c657876SArnaldo Carvalho de Melo { 12218c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 12227c657876SArnaldo Carvalho de Melo 12238c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 12248c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 12257c657876SArnaldo Carvalho de Melo goto out; 12267c657876SArnaldo Carvalho de Melo 12278c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 12288c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 12298c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 12307c657876SArnaldo Carvalho de Melo 1231ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = dccp_li_hist_new("ccid3"); 1232ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist == NULL) 12338c60f3faSArnaldo Carvalho de Melo goto out_free_tx; 12347c657876SArnaldo Carvalho de Melo 12357c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 12367c657876SArnaldo Carvalho de Melo if (rc != 0) 12377c657876SArnaldo Carvalho de Melo goto out_free_loss_interval_history; 12387c657876SArnaldo Carvalho de Melo out: 12397c657876SArnaldo Carvalho de Melo return rc; 12408c60f3faSArnaldo Carvalho de Melo 12417c657876SArnaldo Carvalho de Melo out_free_loss_interval_history: 1242ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1243ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12448c60f3faSArnaldo Carvalho de Melo out_free_tx: 12458c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12468c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12478c60f3faSArnaldo Carvalho de Melo out_free_rx: 12488c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12498c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12507c657876SArnaldo Carvalho de Melo goto out; 12517c657876SArnaldo Carvalho de Melo } 12527c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 12537c657876SArnaldo Carvalho de Melo 12547c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 12557c657876SArnaldo Carvalho de Melo { 12567c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 12577c657876SArnaldo Carvalho de Melo 12588c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 12598c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12608c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12617c657876SArnaldo Carvalho de Melo } 12628c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 12638c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12648c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12657c657876SArnaldo Carvalho de Melo } 1266ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist != NULL) { 1267ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1268ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12697c657876SArnaldo Carvalho de Melo } 12707c657876SArnaldo Carvalho de Melo } 12717c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 12727c657876SArnaldo Carvalho de Melo 1273e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 12741f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 12757c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 12767c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 12777c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1278