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 1037c657876SArnaldo Carvalho de Melo /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */ 1047c657876SArnaldo Carvalho de Melo static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock *hctx) 1057c657876SArnaldo Carvalho de Melo { 106f5c2d636SGerrit Renker hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_x); 1077c657876SArnaldo Carvalho de Melo } 1087c657876SArnaldo Carvalho de Melo 1097c657876SArnaldo Carvalho de Melo /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ 1107c657876SArnaldo Carvalho de Melo static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx) 1117c657876SArnaldo Carvalho de Melo { 1121f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, 1131f2333aeSArnaldo Carvalho de Melo TFRC_OPSYS_HALF_TIME_GRAN); 1147c657876SArnaldo Carvalho de Melo } 1157c657876SArnaldo Carvalho de Melo 1167c657876SArnaldo Carvalho de Melo /* 1177c657876SArnaldo Carvalho de Melo * Update X by 1187c657876SArnaldo Carvalho de Melo * If (p > 0) 1197c657876SArnaldo Carvalho de Melo * x_calc = calcX(s, R, p); 1207c657876SArnaldo Carvalho de Melo * X = max(min(X_calc, 2 * X_recv), s / t_mbi); 1217c657876SArnaldo Carvalho de Melo * Else 1227c657876SArnaldo Carvalho de Melo * If (now - tld >= R) 1237c657876SArnaldo Carvalho de Melo * X = max(min(2 * X, 2 * X_recv), s / R); 1247c657876SArnaldo Carvalho de Melo * tld = now; 1257c657876SArnaldo Carvalho de Melo */ 1267c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_update_x(struct sock *sk) 1277c657876SArnaldo Carvalho de Melo { 12859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1297c657876SArnaldo Carvalho de Melo 1301f2333aeSArnaldo Carvalho de Melo /* To avoid large error in calcX */ 1311f2333aeSArnaldo Carvalho de Melo if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { 13236729c1aSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, 1337c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, 1347c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p); 1351f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, 1361f2333aeSArnaldo Carvalho de Melo 2 * hctx->ccid3hctx_x_recv), 1371f2333aeSArnaldo Carvalho de Melo (hctx->ccid3hctx_s / 1381f2333aeSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME)); 139b6ee3d4aSArnaldo Carvalho de Melo } else { 140b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 141b6ee3d4aSArnaldo Carvalho de Melo 142b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 143b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >= 144b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt) { 1456b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv, 1466b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x) * 2, 1476b5e633aSArnaldo Carvalho de Melo usecs_div(hctx->ccid3hctx_s, 1486b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 149b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 150b6ee3d4aSArnaldo Carvalho de Melo } 1517c657876SArnaldo Carvalho de Melo } 1527c657876SArnaldo Carvalho de Melo } 1537c657876SArnaldo Carvalho de Melo 1547c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 1557c657876SArnaldo Carvalho de Melo { 1567c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 1577c657876SArnaldo Carvalho de Melo unsigned long next_tmout = 0; 15859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1597c657876SArnaldo Carvalho de Melo 1607c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 1617c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 1627c657876SArnaldo Carvalho de Melo /* Try again later. */ 1637c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 1641f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 1651f2333aeSArnaldo Carvalho de Melo jiffies + HZ / 5); 1667c657876SArnaldo Carvalho de Melo goto out; 1677c657876SArnaldo Carvalho de Melo } 1687c657876SArnaldo Carvalho de Melo 1697c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, 1707c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 1717c657876SArnaldo Carvalho de Melo 1727c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 1737c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 1747c657876SArnaldo Carvalho de Melo /* Halve send rate */ 1757c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x /= 2; 1766b5e633aSArnaldo Carvalho de Melo if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / 1776b5e633aSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME)) 1781f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = (hctx->ccid3hctx_s / 1791f2333aeSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME); 1807c657876SArnaldo Carvalho de Melo 1811f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " 1821f2333aeSArnaldo Carvalho de Melo "bytes/s\n", 1831f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 1841f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 1857c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x); 1866b5e633aSArnaldo Carvalho de Melo next_tmout = max_t(u32, 2 * usecs_div(hctx->ccid3hctx_s, 1876b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x), 1881f2333aeSArnaldo Carvalho de Melo TFRC_INITIAL_TIMEOUT); 1891f2333aeSArnaldo Carvalho de Melo /* 1901f2333aeSArnaldo Carvalho de Melo * FIXME - not sure above calculation is correct. See section 1911f2333aeSArnaldo Carvalho de Melo * 5 of CCID3 11 should adjust tx_t_ipi and double that to 1921f2333aeSArnaldo Carvalho de Melo * achieve it really 1931f2333aeSArnaldo Carvalho de Melo */ 1947c657876SArnaldo Carvalho de Melo break; 1957c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 1961f2333aeSArnaldo Carvalho de Melo /* 1971f2333aeSArnaldo Carvalho de Melo * Check if IDLE since last timeout and recv rate is less than 1981f2333aeSArnaldo Carvalho de Melo * 4 packets per RTT 1991f2333aeSArnaldo Carvalho de Melo */ 2001f2333aeSArnaldo Carvalho de Melo if (!hctx->ccid3hctx_idle || 2016b5e633aSArnaldo Carvalho de Melo (hctx->ccid3hctx_x_recv >= 2026b5e633aSArnaldo Carvalho de Melo 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { 2031f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", 2041f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2057c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2067c657876SArnaldo Carvalho de Melo /* Halve sending rate */ 2077c657876SArnaldo Carvalho de Melo 2087c657876SArnaldo Carvalho de Melo /* If (X_calc > 2 * X_recv) 2097c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2107c657876SArnaldo Carvalho de Melo * Else 2117c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2127c657876SArnaldo Carvalho de Melo */ 2131f2333aeSArnaldo Carvalho de Melo BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && 2141f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc == 0); 2157c657876SArnaldo Carvalho de Melo 2167c657876SArnaldo Carvalho de Melo /* check also if p is zero -> x_calc is infinity? */ 2177c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P || 2187c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) 2197c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, 2207c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME)); 2217c657876SArnaldo Carvalho de Melo else 2227c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; 2237c657876SArnaldo Carvalho de Melo 2247c657876SArnaldo Carvalho de Melo /* Update sending rate */ 2257c657876SArnaldo Carvalho de Melo ccid3_hc_tx_update_x(sk); 2267c657876SArnaldo Carvalho de Melo } 2276b5e633aSArnaldo Carvalho de Melo /* 2286b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2296b5e633aSArnaldo Carvalho de Melo * max(4 * R, 2 * s / X) 2306b5e633aSArnaldo Carvalho de Melo */ 231c68e64cfSArnaldo Carvalho de Melo next_tmout = max_t(u32, hctx->ccid3hctx_t_rto, 2326b5e633aSArnaldo Carvalho de Melo 2 * usecs_div(hctx->ccid3hctx_s, 2336b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x)); 2347c657876SArnaldo Carvalho de Melo break; 23559348b19SGerrit Renker case TFRC_SSTATE_NO_SENT: 23659348b19SGerrit Renker DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); 23759348b19SGerrit Renker /* fall through */ 23859348b19SGerrit Renker case TFRC_SSTATE_TERM: 2397c657876SArnaldo Carvalho de Melo goto out; 2407c657876SArnaldo Carvalho de Melo } 2417c657876SArnaldo Carvalho de Melo 2427c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2437c657876SArnaldo Carvalho de Melo jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); 2447c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 2457c657876SArnaldo Carvalho de Melo out: 2467c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2477c657876SArnaldo Carvalho de Melo sock_put(sk); 2487c657876SArnaldo Carvalho de Melo } 2497c657876SArnaldo Carvalho de Melo 25027258ee5SArnaldo Carvalho de Melo static int ccid3_hc_tx_send_packet(struct sock *sk, 25127258ee5SArnaldo Carvalho de Melo struct sk_buff *skb, int len) 2527c657876SArnaldo Carvalho de Melo { 2537c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 25459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2558c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *new_packet; 2567c657876SArnaldo Carvalho de Melo struct timeval now; 25727258ee5SArnaldo Carvalho de Melo long delay; 2587c657876SArnaldo Carvalho de Melo int rc = -ENOTCONN; 2597c657876SArnaldo Carvalho de Melo 26059348b19SGerrit Renker BUG_ON(hctx == NULL); 2611f2333aeSArnaldo Carvalho de Melo 26259d203f9SArnaldo Carvalho de Melo /* Check if pure ACK or Terminating*/ 2637c657876SArnaldo Carvalho de Melo /* 2641f2333aeSArnaldo Carvalho de Melo * XXX: We only call this function for DATA and DATAACK, on, these 2651f2333aeSArnaldo Carvalho de Melo * packets can have zero length, but why the comment about "pure ACK"? 2667c657876SArnaldo Carvalho de Melo */ 26759d203f9SArnaldo Carvalho de Melo if (unlikely(len == 0)) 2687c657876SArnaldo Carvalho de Melo goto out; 2697c657876SArnaldo Carvalho de Melo 2707c657876SArnaldo Carvalho de Melo /* See if last packet allocated was not sent */ 2718c60f3faSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 2728c60f3faSArnaldo Carvalho de Melo if (new_packet == NULL || new_packet->dccphtx_sent) { 2731f2333aeSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, 2741f2333aeSArnaldo Carvalho de Melo SLAB_ATOMIC); 2757c657876SArnaldo Carvalho de Melo 2767c657876SArnaldo Carvalho de Melo rc = -ENOBUFS; 27759d203f9SArnaldo Carvalho de Melo if (unlikely(new_packet == NULL)) { 27859348b19SGerrit Renker DCCP_WARN("%s, sk=%p, not enough mem to add to history," 27959348b19SGerrit Renker "send refused\n", dccp_role(sk), sk); 2807c657876SArnaldo Carvalho de Melo goto out; 2817c657876SArnaldo Carvalho de Melo } 2827c657876SArnaldo Carvalho de Melo 2838c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); 2847c657876SArnaldo Carvalho de Melo } 2857c657876SArnaldo Carvalho de Melo 286b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 2877c657876SArnaldo Carvalho de Melo 2887c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 2897c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 2901f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2911f2333aeSArnaldo Carvalho de Melo jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); 2927c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 2937c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 2947c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 2957c657876SArnaldo Carvalho de Melo 29690feeb95SGerrit Renker /* First timeout, according to [RFC 3448, 4.2], is 1 second */ 29790feeb95SGerrit Renker hctx->ccid3hctx_t_ipi = USEC_PER_SEC; 29890feeb95SGerrit Renker /* Initial delta: minimum of 0.5 sec and t_gran/2 */ 29990feeb95SGerrit Renker hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; 30090feeb95SGerrit Renker 30190feeb95SGerrit Renker /* Set t_0 for initial packet */ 3027c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 3037c657876SArnaldo Carvalho de Melo rc = 0; 3047c657876SArnaldo Carvalho de Melo break; 3057c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3067c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 307b6ee3d4aSArnaldo Carvalho de Melo delay = (timeval_delta(&now, &hctx->ccid3hctx_t_nom) - 308b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_delta); 30927258ee5SArnaldo Carvalho de Melo delay /= -1000; 3107c657876SArnaldo Carvalho de Melo /* divide by -1000 is to convert to ms and get sign right */ 311d6809c12SArnaldo Carvalho de Melo rc = delay > 0 ? delay : 0; 3127c657876SArnaldo Carvalho de Melo break; 31359348b19SGerrit Renker case TFRC_SSTATE_TERM: 31459348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 3157c657876SArnaldo Carvalho de Melo rc = -EINVAL; 3167c657876SArnaldo Carvalho de Melo break; 3177c657876SArnaldo Carvalho de Melo } 3187c657876SArnaldo Carvalho de Melo 3197c657876SArnaldo Carvalho de Melo /* Can we send? if so add options and add to packet history */ 320507d37cfSArnaldo Carvalho de Melo if (rc == 0) { 321507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 322c1734376SArnaldo Carvalho de Melo new_packet->dccphtx_ccval = 3238c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = 3248c60f3faSArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count; 32566a377c5SIan McDonald timeval_add_usecs(&hctx->ccid3hctx_t_nom, 32666a377c5SIan McDonald hctx->ccid3hctx_t_ipi); 327507d37cfSArnaldo Carvalho de Melo } 3287c657876SArnaldo Carvalho de Melo out: 3297c657876SArnaldo Carvalho de Melo return rc; 3307c657876SArnaldo Carvalho de Melo } 3317c657876SArnaldo Carvalho de Melo 3327c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len) 3337c657876SArnaldo Carvalho de Melo { 33459725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 33559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3367c657876SArnaldo Carvalho de Melo struct timeval now; 3377c657876SArnaldo Carvalho de Melo 33859348b19SGerrit Renker BUG_ON(hctx == NULL); 3397c657876SArnaldo Carvalho de Melo 340b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3417c657876SArnaldo Carvalho de Melo 3427c657876SArnaldo Carvalho de Melo /* check if we have sent a data packet */ 3437c657876SArnaldo Carvalho de Melo if (len > 0) { 3447c657876SArnaldo Carvalho de Melo unsigned long quarter_rtt; 3458c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 3467c657876SArnaldo Carvalho de Melo 3478c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 34859d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 34959348b19SGerrit Renker DCCP_WARN("packet doesn't exist in history!\n"); 3507c657876SArnaldo Carvalho de Melo return; 3517c657876SArnaldo Carvalho de Melo } 35259d203f9SArnaldo Carvalho de Melo if (unlikely(packet->dccphtx_sent)) { 35359348b19SGerrit Renker DCCP_WARN("no unsent packet in history!\n"); 3547c657876SArnaldo Carvalho de Melo return; 3557c657876SArnaldo Carvalho de Melo } 3568c60f3faSArnaldo Carvalho de Melo packet->dccphtx_tstamp = now; 3578c60f3faSArnaldo Carvalho de Melo packet->dccphtx_seqno = dp->dccps_gss; 3587c657876SArnaldo Carvalho de Melo /* 3591f2333aeSArnaldo Carvalho de Melo * Check if win_count have changed 3600e64e94eSGerrit Renker * Algorithm in "8.1. Window Counter Value" in RFC 4342. 3617c657876SArnaldo Carvalho de Melo */ 3626b5e633aSArnaldo Carvalho de Melo quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); 3636b5e633aSArnaldo Carvalho de Melo if (likely(hctx->ccid3hctx_rtt > 8)) 3646b5e633aSArnaldo Carvalho de Melo quarter_rtt /= hctx->ccid3hctx_rtt / 4; 3656b5e633aSArnaldo Carvalho de Melo 3667c657876SArnaldo Carvalho de Melo if (quarter_rtt > 0) { 3677c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3687c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + 3697c657876SArnaldo Carvalho de Melo min_t(unsigned long, quarter_rtt, 5)) % 16; 3701f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, window changed from " 3711f2333aeSArnaldo Carvalho de Melo "%u to %u!\n", 3727c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 373c1734376SArnaldo Carvalho de Melo packet->dccphtx_ccval, 3747c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count); 3757c657876SArnaldo Carvalho de Melo } 3761f2333aeSArnaldo Carvalho de Melo 3777c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 0; 378c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 3798c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 3807c657876SArnaldo Carvalho de Melo } else 3817c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", 3827c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, dp->dccps_gss); 3837c657876SArnaldo Carvalho de Melo 3847c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3857c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3867c657876SArnaldo Carvalho de Melo /* if first wasn't pure ack */ 3877c657876SArnaldo Carvalho de Melo if (len != 0) 38859348b19SGerrit Renker DCCP_CRIT("%s, First packet sent is noted " 38959348b19SGerrit Renker "as a data packet", dccp_role(sk)); 3907c657876SArnaldo Carvalho de Melo return; 3917c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 392f5c2d636SGerrit Renker /* t_nom, t_ipi, delta do not change until feedback arrives */ 393f5c2d636SGerrit Renker return; 3947c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 3957c657876SArnaldo Carvalho de Melo if (len > 0) { 39666a377c5SIan McDonald timeval_sub_usecs(&hctx->ccid3hctx_t_nom, 39766a377c5SIan McDonald hctx->ccid3hctx_t_ipi); 3987c657876SArnaldo Carvalho de Melo ccid3_calc_new_t_ipi(hctx); 3997c657876SArnaldo Carvalho de Melo ccid3_calc_new_delta(hctx); 400b6ee3d4aSArnaldo Carvalho de Melo timeval_add_usecs(&hctx->ccid3hctx_t_nom, 401b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 4027c657876SArnaldo Carvalho de Melo } 4037c657876SArnaldo Carvalho de Melo break; 40459348b19SGerrit Renker case TFRC_SSTATE_TERM: 40559348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 4067c657876SArnaldo Carvalho de Melo break; 4077c657876SArnaldo Carvalho de Melo } 4087c657876SArnaldo Carvalho de Melo } 4097c657876SArnaldo Carvalho de Melo 4107c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 4117c657876SArnaldo Carvalho de Melo { 41259725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 41359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 4147c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4158c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 416b0e56780SArnaldo Carvalho de Melo struct timeval now; 4177c657876SArnaldo Carvalho de Melo unsigned long next_tmout; 4181bc09869SIan McDonald u32 t_elapsed; 4197c657876SArnaldo Carvalho de Melo u32 pinv; 4207c657876SArnaldo Carvalho de Melo u32 x_recv; 4217c657876SArnaldo Carvalho de Melo u32 r_sample; 4221f2333aeSArnaldo Carvalho de Melo 42359348b19SGerrit Renker BUG_ON(hctx == NULL); 4247c657876SArnaldo Carvalho de Melo 4257c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4267c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4277c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4287c657876SArnaldo Carvalho de Melo return; 4297c657876SArnaldo Carvalho de Melo 4307c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4317c657876SArnaldo Carvalho de Melo 4321a28599aSArnaldo Carvalho de Melo t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; 4337c657876SArnaldo Carvalho de Melo x_recv = opt_recv->ccid3or_receive_rate; 4347c657876SArnaldo Carvalho de Melo pinv = opt_recv->ccid3or_loss_event_rate; 4357c657876SArnaldo Carvalho de Melo 4367c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4377c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 4387c657876SArnaldo Carvalho de Melo /* FIXME: what to do here? */ 4397c657876SArnaldo Carvalho de Melo return; 4407c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4417c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4427c657876SArnaldo Carvalho de Melo /* Calculate new round trip sample by 4437c657876SArnaldo Carvalho de Melo * R_sample = (now - t_recvdata) - t_delay */ 4447c657876SArnaldo Carvalho de Melo /* get t_recvdata from history */ 4458c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4468c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 44759d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 44859348b19SGerrit Renker DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist " 44959348b19SGerrit Renker "in history!\n", dccp_role(sk), sk, 45059d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4517c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4527c657876SArnaldo Carvalho de Melo return; 4537c657876SArnaldo Carvalho de Melo } 4547c657876SArnaldo Carvalho de Melo 4557c657876SArnaldo Carvalho de Melo /* Update RTT */ 456b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 457b0e56780SArnaldo Carvalho de Melo r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); 4581a28599aSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 45959348b19SGerrit Renker DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n", 46059348b19SGerrit Renker r_sample, t_elapsed); 4611a28599aSArnaldo Carvalho de Melo else 4621a28599aSArnaldo Carvalho de Melo r_sample -= t_elapsed; 4637c657876SArnaldo Carvalho de Melo 4647c657876SArnaldo Carvalho de Melo /* Update RTT estimate by 4657c657876SArnaldo Carvalho de Melo * If (No feedback recv) 4667c657876SArnaldo Carvalho de Melo * R = R_sample; 4677c657876SArnaldo Carvalho de Melo * Else 4687c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 4697c657876SArnaldo Carvalho de Melo * 4707c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 4717c657876SArnaldo Carvalho de Melo */ 4727c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 4737c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 4747c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 4757c657876SArnaldo Carvalho de Melo } else 4761f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + 4771f2333aeSArnaldo Carvalho de Melo r_sample / 10; 4787c657876SArnaldo Carvalho de Melo 4791f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " 4801f2333aeSArnaldo Carvalho de Melo "r_sample=%us\n", dccp_role(sk), sk, 4811f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, r_sample); 4827c657876SArnaldo Carvalho de Melo 4837c657876SArnaldo Carvalho de Melo /* Update timeout interval */ 484c68e64cfSArnaldo Carvalho de Melo hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 485cef07fd6SArnaldo Carvalho de Melo USEC_PER_SEC); 4867c657876SArnaldo Carvalho de Melo 4877c657876SArnaldo Carvalho de Melo /* Update receive rate */ 4881f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ 4897c657876SArnaldo Carvalho de Melo 4907c657876SArnaldo Carvalho de Melo /* Update loss event rate */ 4917c657876SArnaldo Carvalho de Melo if (pinv == ~0 || pinv == 0) 4927c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 0; 4937c657876SArnaldo Carvalho de Melo else { 4947c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 1000000 / pinv; 4957c657876SArnaldo Carvalho de Melo 4967c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { 4977c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = TFRC_SMALLEST_P; 4981f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", 4991f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk); 5007c657876SArnaldo Carvalho de Melo } 5017c657876SArnaldo Carvalho de Melo } 5027c657876SArnaldo Carvalho de Melo 5037c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 5047c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5057c657876SArnaldo Carvalho de Melo 5067c657876SArnaldo Carvalho de Melo /* Update sending rate */ 5077c657876SArnaldo Carvalho de Melo ccid3_hc_tx_update_x(sk); 5087c657876SArnaldo Carvalho de Melo 5097c657876SArnaldo Carvalho de Melo /* Update next send time */ 510b6ee3d4aSArnaldo Carvalho de Melo timeval_sub_usecs(&hctx->ccid3hctx_t_nom, 511b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 5127c657876SArnaldo Carvalho de Melo ccid3_calc_new_t_ipi(hctx); 513b6ee3d4aSArnaldo Carvalho de Melo timeval_add_usecs(&hctx->ccid3hctx_t_nom, 514b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 5157c657876SArnaldo Carvalho de Melo ccid3_calc_new_delta(hctx); 5167c657876SArnaldo Carvalho de Melo 5177c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5188c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5198c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 520c530cfb1SArnaldo Carvalho de Melo /* 521c530cfb1SArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible that 522c530cfb1SArnaldo Carvalho de Melo * we now can send a packet, so wake up dccp_wait_for_ccids. 523c530cfb1SArnaldo Carvalho de Melo */ 524c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5258c60f3faSArnaldo Carvalho de Melo 5261f2333aeSArnaldo Carvalho de Melo /* 5271f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5281f2333aeSArnaldo Carvalho de Melo * max(4 * R, 2 * s / X) 5291f2333aeSArnaldo Carvalho de Melo */ 530c68e64cfSArnaldo Carvalho de Melo next_tmout = max(hctx->ccid3hctx_t_rto, 5316b5e633aSArnaldo Carvalho de Melo 2 * usecs_div(hctx->ccid3hctx_s, 5326b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x)); 5337c657876SArnaldo Carvalho de Melo 5341f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " 5351f2333aeSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5361f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 5371f2333aeSArnaldo Carvalho de Melo usecs_to_jiffies(next_tmout), next_tmout); 5387c657876SArnaldo Carvalho de Melo 5397c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5407c657876SArnaldo Carvalho de Melo jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); 5417c657876SArnaldo Carvalho de Melo 5427c657876SArnaldo Carvalho de Melo /* set idle flag */ 5437c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5447c657876SArnaldo Carvalho de Melo break; 54559348b19SGerrit Renker case TFRC_SSTATE_TERM: 54659348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 5477c657876SArnaldo Carvalho de Melo break; 5487c657876SArnaldo Carvalho de Melo } 5497c657876SArnaldo Carvalho de Melo } 5507c657876SArnaldo Carvalho de Melo 5512d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) 5527c657876SArnaldo Carvalho de Melo { 55359d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5547c657876SArnaldo Carvalho de Melo 55559d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 55659d203f9SArnaldo Carvalho de Melo 5572d0817d1SArnaldo Carvalho de Melo if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) 5587c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 5592d0817d1SArnaldo Carvalho de Melo return 0; 5607c657876SArnaldo Carvalho de Melo } 5617c657876SArnaldo Carvalho de Melo 5627c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5631f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5641f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5657c657876SArnaldo Carvalho de Melo { 5667c657876SArnaldo Carvalho de Melo int rc = 0; 56759725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 56859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5697c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 5707c657876SArnaldo Carvalho de Melo 57159d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 5727c657876SArnaldo Carvalho de Melo 5737c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5747c657876SArnaldo Carvalho de Melo 5757c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5767c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5777c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5787c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5797c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5807c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5817c657876SArnaldo Carvalho de Melo } 5827c657876SArnaldo Carvalho de Melo 5837c657876SArnaldo Carvalho de Melo switch (option) { 5847c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 58559d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 58659348b19SGerrit Renker DCCP_WARN("%s, sk=%p, invalid len %d " 58759348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 58859348b19SGerrit Renker dccp_role(sk), sk, len); 5897c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5907c657876SArnaldo Carvalho de Melo } else { 59160fe62e7SAndrea Bittau opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); 5927c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", 5937c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5947c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 5957c657876SArnaldo Carvalho de Melo } 5967c657876SArnaldo Carvalho de Melo break; 5977c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 5987c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 5997c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 6007c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", 6017c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6027c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 6037c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 6047c657876SArnaldo Carvalho de Melo break; 6057c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 60659d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 60759348b19SGerrit Renker DCCP_WARN("%s, sk=%p, invalid len %d " 60859348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 60959348b19SGerrit Renker dccp_role(sk), sk, len); 6107c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6117c657876SArnaldo Carvalho de Melo } else { 61260fe62e7SAndrea Bittau opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); 6137c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", 6147c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6157c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 6167c657876SArnaldo Carvalho de Melo } 6177c657876SArnaldo Carvalho de Melo break; 6187c657876SArnaldo Carvalho de Melo } 6197c657876SArnaldo Carvalho de Melo 6207c657876SArnaldo Carvalho de Melo return rc; 6217c657876SArnaldo Carvalho de Melo } 6227c657876SArnaldo Carvalho de Melo 62391f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 6247c657876SArnaldo Carvalho de Melo { 6257c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 62691f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 6277c657876SArnaldo Carvalho de Melo 628a84ffe43SArnaldo Carvalho de Melo if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && 629a84ffe43SArnaldo Carvalho de Melo dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) 630a84ffe43SArnaldo Carvalho de Melo hctx->ccid3hctx_s = dp->dccps_packet_size; 6317c657876SArnaldo Carvalho de Melo else 6327c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE; 6337c657876SArnaldo Carvalho de Melo 6341f2333aeSArnaldo Carvalho de Melo /* Set transmission rate to 1 packet per second */ 6351f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = hctx->ccid3hctx_s; 636c68e64cfSArnaldo Carvalho de Melo hctx->ccid3hctx_t_rto = USEC_PER_SEC; 6377c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6387c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 639aa5d7df3SArnaldo Carvalho de Melo 640aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; 641aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 6427c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6437c657876SArnaldo Carvalho de Melo 6447c657876SArnaldo Carvalho de Melo return 0; 6457c657876SArnaldo Carvalho de Melo } 6467c657876SArnaldo Carvalho de Melo 6477c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6487c657876SArnaldo Carvalho de Melo { 64959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6507c657876SArnaldo Carvalho de Melo 6517c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 6527c657876SArnaldo Carvalho de Melo 6537c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6547c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6557c657876SArnaldo Carvalho de Melo 6567c657876SArnaldo Carvalho de Melo /* Empty packet history */ 6578c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 6587c657876SArnaldo Carvalho de Melo } 6597c657876SArnaldo Carvalho de Melo 6607c657876SArnaldo Carvalho de Melo /* 6617c657876SArnaldo Carvalho de Melo * RX Half Connection methods 6627c657876SArnaldo Carvalho de Melo */ 6637c657876SArnaldo Carvalho de Melo 66456724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6657c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6667c657876SArnaldo Carvalho de Melo { 6677c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6687c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6697c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6707c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6717c657876SArnaldo Carvalho de Melo }; 6727c657876SArnaldo Carvalho de Melo 6737c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6747c657876SArnaldo Carvalho de Melo } 6757c657876SArnaldo Carvalho de Melo #endif 6767c657876SArnaldo Carvalho de Melo 677c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 6781f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 6797c657876SArnaldo Carvalho de Melo { 68059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6817c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 6827c657876SArnaldo Carvalho de Melo 6837c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 6841f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 6851f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 6867c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 6877c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 6887c657876SArnaldo Carvalho de Melo } 6897c657876SArnaldo Carvalho de Melo 6907c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 6917c657876SArnaldo Carvalho de Melo { 69259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6937c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 6948c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 695b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 6967c657876SArnaldo Carvalho de Melo 6977c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 6987c657876SArnaldo Carvalho de Melo 699b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 700b6ee3d4aSArnaldo Carvalho de Melo 7017c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 7027c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 7037c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 7047c657876SArnaldo Carvalho de Melo break; 7057c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: { 706b6ee3d4aSArnaldo Carvalho de Melo const u32 delta = timeval_delta(&now, 707b6ee3d4aSArnaldo Carvalho de Melo &hcrx->ccid3hcrx_tstamp_last_feedback); 70827ae543eSArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, 70927ae543eSArnaldo Carvalho de Melo delta); 7107c657876SArnaldo Carvalho de Melo } 7117c657876SArnaldo Carvalho de Melo break; 71259348b19SGerrit Renker case TFRC_RSTATE_TERM: 71359348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 7147c657876SArnaldo Carvalho de Melo return; 7157c657876SArnaldo Carvalho de Melo } 7167c657876SArnaldo Carvalho de Melo 7178c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 71859d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 71959348b19SGerrit Renker DCCP_WARN("%s, sk=%p, no data packet in history!\n", 72059348b19SGerrit Renker dccp_role(sk), sk); 7217c657876SArnaldo Carvalho de Melo return; 7227c657876SArnaldo Carvalho de Melo } 7237c657876SArnaldo Carvalho de Melo 724b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 72566a377c5SIan McDonald hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; 7267c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7277c657876SArnaldo Carvalho de Melo 7287c657876SArnaldo Carvalho de Melo /* Convert to multiples of 10us */ 729b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time = 730b6ee3d4aSArnaldo Carvalho de Melo timeval_delta(&now, &packet->dccphrx_tstamp) / 10; 7317c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 7327c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = ~0; 7337c657876SArnaldo Carvalho de Melo else 7347c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 735507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7367c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7377c657876SArnaldo Carvalho de Melo } 7387c657876SArnaldo Carvalho de Melo 7392d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7407c657876SArnaldo Carvalho de Melo { 74159d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 74260fe62e7SAndrea Bittau __be32 x_recv, pinv; 7437c657876SArnaldo Carvalho de Melo 74459d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 74559d203f9SArnaldo Carvalho de Melo 74659d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7472d0817d1SArnaldo Carvalho de Melo return 0; 7487c657876SArnaldo Carvalho de Melo 74966a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 7504fded33bSArnaldo Carvalho de Melo 7514fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7522d0817d1SArnaldo Carvalho de Melo return 0; 7534fded33bSArnaldo Carvalho de Melo 7544fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7554fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7562d0817d1SArnaldo Carvalho de Melo 7572d0817d1SArnaldo Carvalho de Melo if ((hcrx->ccid3hcrx_elapsed_time != 0 && 7582d0817d1SArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 7592d0817d1SArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time)) || 7602d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb) || 7614fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7622d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7634fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 7642d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 7652d0817d1SArnaldo Carvalho de Melo return -1; 7662d0817d1SArnaldo Carvalho de Melo 7672d0817d1SArnaldo Carvalho de Melo return 0; 7687c657876SArnaldo Carvalho de Melo } 7697c657876SArnaldo Carvalho de Melo 7707c657876SArnaldo Carvalho de Melo /* calculate first loss interval 7717c657876SArnaldo Carvalho de Melo * 7727c657876SArnaldo Carvalho de Melo * returns estimated loss interval in usecs */ 7737c657876SArnaldo Carvalho de Melo 7747c657876SArnaldo Carvalho de Melo static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) 7757c657876SArnaldo Carvalho de Melo { 77659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7778c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *entry, *next, *tail = NULL; 7787c657876SArnaldo Carvalho de Melo u32 rtt, delta, x_recv, fval, p, tmp2; 779b6ee3d4aSArnaldo Carvalho de Melo struct timeval tstamp = { 0, }; 7807c657876SArnaldo Carvalho de Melo int interval = 0; 7817c657876SArnaldo Carvalho de Melo int win_count = 0; 7827c657876SArnaldo Carvalho de Melo int step = 0; 7837c657876SArnaldo Carvalho de Melo u64 tmp1; 7847c657876SArnaldo Carvalho de Melo 7858c60f3faSArnaldo Carvalho de Melo list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, 7868c60f3faSArnaldo Carvalho de Melo dccphrx_node) { 7878c60f3faSArnaldo Carvalho de Melo if (dccp_rx_hist_entry_data_packet(entry)) { 7887c657876SArnaldo Carvalho de Melo tail = entry; 7897c657876SArnaldo Carvalho de Melo 7907c657876SArnaldo Carvalho de Melo switch (step) { 7917c657876SArnaldo Carvalho de Melo case 0: 7928c60f3faSArnaldo Carvalho de Melo tstamp = entry->dccphrx_tstamp; 793c1734376SArnaldo Carvalho de Melo win_count = entry->dccphrx_ccval; 7947c657876SArnaldo Carvalho de Melo step = 1; 7957c657876SArnaldo Carvalho de Melo break; 7967c657876SArnaldo Carvalho de Melo case 1: 797c1734376SArnaldo Carvalho de Melo interval = win_count - entry->dccphrx_ccval; 7987c657876SArnaldo Carvalho de Melo if (interval < 0) 7997c657876SArnaldo Carvalho de Melo interval += TFRC_WIN_COUNT_LIMIT; 8007c657876SArnaldo Carvalho de Melo if (interval > 4) 8017c657876SArnaldo Carvalho de Melo goto found; 8027c657876SArnaldo Carvalho de Melo break; 8037c657876SArnaldo Carvalho de Melo } 8047c657876SArnaldo Carvalho de Melo } 8057c657876SArnaldo Carvalho de Melo } 8067c657876SArnaldo Carvalho de Melo 80759d203f9SArnaldo Carvalho de Melo if (unlikely(step == 0)) { 80859348b19SGerrit Renker DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", 80959348b19SGerrit Renker dccp_role(sk), sk); 8107c657876SArnaldo Carvalho de Melo return ~0; 8117c657876SArnaldo Carvalho de Melo } 8127c657876SArnaldo Carvalho de Melo 81359d203f9SArnaldo Carvalho de Melo if (unlikely(interval == 0)) { 81459348b19SGerrit Renker DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." 81559348b19SGerrit Renker "Defaulting to 1\n", dccp_role(sk), sk); 8167c657876SArnaldo Carvalho de Melo interval = 1; 8177c657876SArnaldo Carvalho de Melo } 8187c657876SArnaldo Carvalho de Melo found: 81966a377c5SIan McDonald if (!tail) { 82059348b19SGerrit Renker DCCP_CRIT("tail is null\n"); 82166a377c5SIan McDonald return ~0; 82266a377c5SIan McDonald } 823b6ee3d4aSArnaldo Carvalho de Melo rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; 8247c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", 8257c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, rtt); 82659348b19SGerrit Renker 82759348b19SGerrit Renker if (rtt == 0) { 82859348b19SGerrit Renker DCCP_WARN("RTT==0, setting to 1\n"); 8297c657876SArnaldo Carvalho de Melo rtt = 1; 83059348b19SGerrit Renker } 8317c657876SArnaldo Carvalho de Melo 832b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &tstamp); 833b0e56780SArnaldo Carvalho de Melo delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); 834b0e56780SArnaldo Carvalho de Melo x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); 8357c657876SArnaldo Carvalho de Melo 83666a377c5SIan McDonald if (x_recv == 0) 83766a377c5SIan McDonald x_recv = hcrx->ccid3hcrx_x_recv; 83866a377c5SIan McDonald 8397c657876SArnaldo Carvalho de Melo tmp1 = (u64)x_recv * (u64)rtt; 8407c657876SArnaldo Carvalho de Melo do_div(tmp1,10000000); 8417c657876SArnaldo Carvalho de Melo tmp2 = (u32)tmp1; 84266a377c5SIan McDonald 84366a377c5SIan McDonald if (!tmp2) { 84459348b19SGerrit Renker DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv, rtt); 84566a377c5SIan McDonald return ~0; 84666a377c5SIan McDonald } 84766a377c5SIan McDonald 8487c657876SArnaldo Carvalho de Melo fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; 8497c657876SArnaldo Carvalho de Melo /* do not alter order above or you will get overflow on 32 bit */ 85036729c1aSArnaldo Carvalho de Melo p = tfrc_calc_x_reverse_lookup(fval); 8511f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " 8521f2333aeSArnaldo Carvalho de Melo "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 8537c657876SArnaldo Carvalho de Melo 8547c657876SArnaldo Carvalho de Melo if (p == 0) 8557c657876SArnaldo Carvalho de Melo return ~0; 8567c657876SArnaldo Carvalho de Melo else 8577c657876SArnaldo Carvalho de Melo return 1000000 / p; 8587c657876SArnaldo Carvalho de Melo } 8597c657876SArnaldo Carvalho de Melo 8607c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) 8617c657876SArnaldo Carvalho de Melo { 86259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 863fc747e82SIan McDonald struct dccp_li_hist_entry *head; 86466a377c5SIan McDonald u64 seq_temp; 8657c657876SArnaldo Carvalho de Melo 86666a377c5SIan McDonald if (list_empty(&hcrx->ccid3hcrx_li_hist)) { 86766a377c5SIan McDonald if (!dccp_li_hist_interval_new(ccid3_li_hist, 86866a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) 869ae6706f0SArnaldo Carvalho de Melo return; 87066a377c5SIan McDonald 871fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 872fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 873fc747e82SIan McDonald head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); 87466a377c5SIan McDonald } else { 87566a377c5SIan McDonald struct dccp_li_hist_entry *entry; 87666a377c5SIan McDonald struct list_head *tail; 87766a377c5SIan McDonald 878fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 879fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 88066a377c5SIan McDonald /* FIXME win count check removed as was wrong */ 88166a377c5SIan McDonald /* should make this check with receive history */ 88266a377c5SIan McDonald /* and compare there as per section 10.2 of RFC4342 */ 88366a377c5SIan McDonald 88466a377c5SIan McDonald /* new loss event detected */ 88566a377c5SIan McDonald /* calculate last interval length */ 88666a377c5SIan McDonald seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); 88766a377c5SIan McDonald entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); 88866a377c5SIan McDonald 88966a377c5SIan McDonald if (entry == NULL) { 89059348b19SGerrit Renker DCCP_BUG("out of memory - can not allocate entry"); 89166a377c5SIan McDonald return; 8927c657876SArnaldo Carvalho de Melo } 8937c657876SArnaldo Carvalho de Melo 89466a377c5SIan McDonald list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); 89566a377c5SIan McDonald 89666a377c5SIan McDonald tail = hcrx->ccid3hcrx_li_hist.prev; 89766a377c5SIan McDonald list_del(tail); 89866a377c5SIan McDonald kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); 89966a377c5SIan McDonald 90066a377c5SIan McDonald /* Create the newest interval */ 90166a377c5SIan McDonald entry->dccplih_seqno = seq_loss; 90266a377c5SIan McDonald entry->dccplih_interval = seq_temp; 90366a377c5SIan McDonald entry->dccplih_win_count = win_loss; 90466a377c5SIan McDonald } 90566a377c5SIan McDonald } 90666a377c5SIan McDonald 90766a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 90866a377c5SIan McDonald struct dccp_rx_hist_entry *packet) 9097c657876SArnaldo Carvalho de Melo { 91059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 91166a377c5SIan McDonald struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); 91266a377c5SIan McDonald u64 seqno = packet->dccphrx_seqno; 91366a377c5SIan McDonald u64 tmp_seqno; 91466a377c5SIan McDonald int loss = 0; 91566a377c5SIan McDonald u8 ccval; 9167c657876SArnaldo Carvalho de Melo 91766a377c5SIan McDonald 91866a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 91966a377c5SIan McDonald 92066a377c5SIan McDonald if (!rx_hist || 92166a377c5SIan McDonald follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 92266a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 92366a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 92466a377c5SIan McDonald goto detect_out; 92566a377c5SIan McDonald } 92666a377c5SIan McDonald 92766a377c5SIan McDonald 92866a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 92966a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 93066a377c5SIan McDonald loss = 1; 93166a377c5SIan McDonald ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, 93266a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 93366a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 93466a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 93566a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 93666a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 93766a377c5SIan McDonald while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 93866a377c5SIan McDonald tmp_seqno, &ccval)) { 93966a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 94066a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 94166a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 94266a377c5SIan McDonald } 94366a377c5SIan McDonald } 94466a377c5SIan McDonald 94566a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 94666a377c5SIan McDonald /* but works at moment */ 94766a377c5SIan McDonald if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 94866a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 94966a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 95066a377c5SIan McDonald } 95166a377c5SIan McDonald 95266a377c5SIan McDonald detect_out: 95366a377c5SIan McDonald dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 95466a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 95566a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 95666a377c5SIan McDonald return loss; 9577c657876SArnaldo Carvalho de Melo } 9587c657876SArnaldo Carvalho de Melo 9597c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 9607c657876SArnaldo Carvalho de Melo { 96159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9624fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 9638c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 9647c657876SArnaldo Carvalho de Melo struct timeval now; 96566a377c5SIan McDonald u32 p_prev, rtt_prev, r_sample, t_elapsed; 96666a377c5SIan McDonald int loss; 9671f2333aeSArnaldo Carvalho de Melo 96859348b19SGerrit Renker BUG_ON(hcrx == NULL); 9697c657876SArnaldo Carvalho de Melo 97059725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 9714fded33bSArnaldo Carvalho de Melo 9727c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 9737c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 9747c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 9757c657876SArnaldo Carvalho de Melo return; 9767c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 9774fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 9787c657876SArnaldo Carvalho de Melo break; 97966a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 980b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 981b3a3077dSArnaldo Carvalho de Melo timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); 982b3a3077dSArnaldo Carvalho de Melo r_sample = timeval_usecs(&now); 983b3a3077dSArnaldo Carvalho de Melo t_elapsed = opt_recv->dccpor_elapsed_time * 10; 984b3a3077dSArnaldo Carvalho de Melo 985b3a3077dSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 98659348b19SGerrit Renker DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", 98759348b19SGerrit Renker r_sample, t_elapsed); 988b3a3077dSArnaldo Carvalho de Melo else 989b3a3077dSArnaldo Carvalho de Melo r_sample -= t_elapsed; 990b3a3077dSArnaldo Carvalho de Melo 991b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 992b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 993b3a3077dSArnaldo Carvalho de Melo else 994b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 995b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 996b3a3077dSArnaldo Carvalho de Melo 99766a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 99866a377c5SIan McDonald ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", 9994fded33bSArnaldo Carvalho de Melo dccp_role(sk), hcrx->ccid3hcrx_rtt, 10004fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 10017c657876SArnaldo Carvalho de Melo break; 10027c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 10037c657876SArnaldo Carvalho de Melo break; 100459d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 10057c657876SArnaldo Carvalho de Melo return; 10067c657876SArnaldo Carvalho de Melo } 10077c657876SArnaldo Carvalho de Melo 1008b0e56780SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, 10098c60f3faSArnaldo Carvalho de Melo skb, SLAB_ATOMIC); 101059d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 101159348b19SGerrit Renker DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " 101259348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 10137c657876SArnaldo Carvalho de Melo return; 10147c657876SArnaldo Carvalho de Melo } 10157c657876SArnaldo Carvalho de Melo 101666a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 10177c657876SArnaldo Carvalho de Melo 10187c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 10197c657876SArnaldo Carvalho de Melo return; 10207c657876SArnaldo Carvalho de Melo 10217c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 10227c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 10231f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " 10241f2333aeSArnaldo Carvalho de Melo "feedback\n", 10251f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 10261f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 10277c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10287c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 10297c657876SArnaldo Carvalho de Melo return; 10307c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 10311f2333aeSArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv += skb->len - 10321f2333aeSArnaldo Carvalho de Melo dccp_hdr(skb)->dccph_doff * 4; 103366a377c5SIan McDonald if (loss) 1034b6ee3d4aSArnaldo Carvalho de Melo break; 1035b6ee3d4aSArnaldo Carvalho de Melo 1036b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 1037b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= 10384fded33bSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt) { 1039b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 10407c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10417c657876SArnaldo Carvalho de Melo } 10427c657876SArnaldo Carvalho de Melo return; 104359348b19SGerrit Renker case TFRC_RSTATE_TERM: 104459348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 10457c657876SArnaldo Carvalho de Melo return; 10467c657876SArnaldo Carvalho de Melo } 10477c657876SArnaldo Carvalho de Melo 10487c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 10494fded33bSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", 10504fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 10517c657876SArnaldo Carvalho de Melo 10527c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 10537c657876SArnaldo Carvalho de Melo 10547c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 1055c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 1056c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 1057c0996660SIan McDonald 10587c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 1059c0996660SIan McDonald if (i_mean != 0) 1060c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 106159348b19SGerrit Renker } else 106259348b19SGerrit Renker DCCP_BUG("empty loss history"); 10637c657876SArnaldo Carvalho de Melo 10647c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 10657c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10667c657876SArnaldo Carvalho de Melo return; 10677c657876SArnaldo Carvalho de Melo } 10687c657876SArnaldo Carvalho de Melo } 10697c657876SArnaldo Carvalho de Melo 107091f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 10717c657876SArnaldo Carvalho de Melo { 10727c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 107391f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 10747c657876SArnaldo Carvalho de Melo 10757c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 10767c657876SArnaldo Carvalho de Melo 1077a84ffe43SArnaldo Carvalho de Melo if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && 1078a84ffe43SArnaldo Carvalho de Melo dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) 1079a84ffe43SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = dp->dccps_packet_size; 10807c657876SArnaldo Carvalho de Melo else 10817c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE; 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; 1088954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ 10897c657876SArnaldo Carvalho de Melo return 0; 10907c657876SArnaldo Carvalho de Melo } 10917c657876SArnaldo Carvalho de Melo 10927c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 10937c657876SArnaldo Carvalho de Melo { 109459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 10957c657876SArnaldo Carvalho de Melo 109659d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 10977c657876SArnaldo Carvalho de Melo 10987c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 10997c657876SArnaldo Carvalho de Melo 11007c657876SArnaldo Carvalho de Melo /* Empty packet history */ 11018c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 11027c657876SArnaldo Carvalho de Melo 11037c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 1104ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); 11057c657876SArnaldo Carvalho de Melo } 11067c657876SArnaldo Carvalho de Melo 11072babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 11082babe1f6SArnaldo Carvalho de Melo { 110959725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 11102babe1f6SArnaldo Carvalho de Melo 111159c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 111259c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 111359c2353dSArnaldo Carvalho de Melo return; 111459c2353dSArnaldo Carvalho de Melo 111559d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 11162babe1f6SArnaldo Carvalho de Melo 11172babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 11182babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 11192babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 11202babe1f6SArnaldo Carvalho de Melo } 11212babe1f6SArnaldo Carvalho de Melo 11222babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 11232babe1f6SArnaldo Carvalho de Melo { 112459725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 11252babe1f6SArnaldo Carvalho de Melo 112659c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 112759c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 112859c2353dSArnaldo Carvalho de Melo return; 112959c2353dSArnaldo Carvalho de Melo 113059d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 11312babe1f6SArnaldo Carvalho de Melo 11322babe1f6SArnaldo Carvalho de Melo info->tcpi_rto = hctx->ccid3hctx_t_rto; 11332babe1f6SArnaldo Carvalho de Melo info->tcpi_rtt = hctx->ccid3hctx_rtt; 11342babe1f6SArnaldo Carvalho de Melo } 11352babe1f6SArnaldo Carvalho de Melo 113688f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_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_rx_sock *hcrx = ccid3_hc_rx_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_RX_INFO: 114888f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 114988f964dbSArnaldo Carvalho de Melo return -EINVAL; 115088f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 115188f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_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 116388f964dbSArnaldo Carvalho de Melo static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 116488f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 116588f964dbSArnaldo Carvalho de Melo { 116688f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 116788f964dbSArnaldo Carvalho de Melo const void *val; 116888f964dbSArnaldo Carvalho de Melo 116988f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 117088f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 117188f964dbSArnaldo Carvalho de Melo return -EINVAL; 117288f964dbSArnaldo Carvalho de Melo 117388f964dbSArnaldo Carvalho de Melo switch (optname) { 117488f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_TX_INFO: 117588f964dbSArnaldo Carvalho de Melo if (len < sizeof(hctx->ccid3hctx_tfrc)) 117688f964dbSArnaldo Carvalho de Melo return -EINVAL; 117788f964dbSArnaldo Carvalho de Melo len = sizeof(hctx->ccid3hctx_tfrc); 117888f964dbSArnaldo Carvalho de Melo val = &hctx->ccid3hctx_tfrc; 117988f964dbSArnaldo Carvalho de Melo break; 118088f964dbSArnaldo Carvalho de Melo default: 118188f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 118288f964dbSArnaldo Carvalho de Melo } 118388f964dbSArnaldo Carvalho de Melo 118488f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 118588f964dbSArnaldo Carvalho de Melo return -EFAULT; 118688f964dbSArnaldo Carvalho de Melo 118788f964dbSArnaldo Carvalho de Melo return 0; 118888f964dbSArnaldo Carvalho de Melo } 118988f964dbSArnaldo Carvalho de Melo 119091f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 11913dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 11927c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 11937c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 119491f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 11957c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 11967c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 11977c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 11987c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 11997c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 12007c657876SArnaldo Carvalho de Melo .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, 12017c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 120291f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 12037c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 12047c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 12057c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 12067c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 12072babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 12082babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 120988f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 121088f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 12117c657876SArnaldo Carvalho de Melo }; 12127c657876SArnaldo Carvalho de Melo 121356724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 12147c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 12157c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 121656724aa4SGerrit Renker #endif 12177c657876SArnaldo Carvalho de Melo 12187c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 12197c657876SArnaldo Carvalho de Melo { 12208c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 12217c657876SArnaldo Carvalho de Melo 12228c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 12238c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 12247c657876SArnaldo Carvalho de Melo goto out; 12257c657876SArnaldo Carvalho de Melo 12268c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 12278c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 12288c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 12297c657876SArnaldo Carvalho de Melo 1230ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = dccp_li_hist_new("ccid3"); 1231ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist == NULL) 12328c60f3faSArnaldo Carvalho de Melo goto out_free_tx; 12337c657876SArnaldo Carvalho de Melo 12347c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 12357c657876SArnaldo Carvalho de Melo if (rc != 0) 12367c657876SArnaldo Carvalho de Melo goto out_free_loss_interval_history; 12377c657876SArnaldo Carvalho de Melo out: 12387c657876SArnaldo Carvalho de Melo return rc; 12398c60f3faSArnaldo Carvalho de Melo 12407c657876SArnaldo Carvalho de Melo out_free_loss_interval_history: 1241ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1242ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12438c60f3faSArnaldo Carvalho de Melo out_free_tx: 12448c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12458c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12468c60f3faSArnaldo Carvalho de Melo out_free_rx: 12478c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12488c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12497c657876SArnaldo Carvalho de Melo goto out; 12507c657876SArnaldo Carvalho de Melo } 12517c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 12527c657876SArnaldo Carvalho de Melo 12537c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 12547c657876SArnaldo Carvalho de Melo { 12557c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 12567c657876SArnaldo Carvalho de Melo 12578c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 12588c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12598c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12607c657876SArnaldo Carvalho de Melo } 12618c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 12628c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12638c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12647c657876SArnaldo Carvalho de Melo } 1265ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist != NULL) { 1266ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1267ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12687c657876SArnaldo Carvalho de Melo } 12697c657876SArnaldo Carvalho de Melo } 12707c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 12717c657876SArnaldo Carvalho de Melo 1272e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 12731f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 12747c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 12757c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 12767c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1277