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 { 1066b5e633aSArnaldo Carvalho de Melo /* 1076b5e633aSArnaldo Carvalho de Melo * If no feedback spec says t_ipi is 1 second (set elsewhere and then 1086b5e633aSArnaldo Carvalho de Melo * doubles after every no feedback timer (separate function) 1096b5e633aSArnaldo Carvalho de Melo */ 1106b5e633aSArnaldo Carvalho de Melo if (hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK) 1116b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s, 1126b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x); 1137c657876SArnaldo Carvalho de Melo } 1147c657876SArnaldo Carvalho de Melo 1157c657876SArnaldo Carvalho de Melo /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ 1167c657876SArnaldo Carvalho de Melo static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx) 1177c657876SArnaldo Carvalho de Melo { 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 /* 1237c657876SArnaldo Carvalho de Melo * Update X by 1247c657876SArnaldo Carvalho de Melo * If (p > 0) 1257c657876SArnaldo Carvalho de Melo * x_calc = calcX(s, R, p); 1267c657876SArnaldo Carvalho de Melo * X = max(min(X_calc, 2 * X_recv), s / t_mbi); 1277c657876SArnaldo Carvalho de Melo * Else 1287c657876SArnaldo Carvalho de Melo * If (now - tld >= R) 1297c657876SArnaldo Carvalho de Melo * X = max(min(2 * X, 2 * X_recv), s / R); 1307c657876SArnaldo Carvalho de Melo * tld = now; 1317c657876SArnaldo Carvalho de Melo */ 1327c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_update_x(struct sock *sk) 1337c657876SArnaldo Carvalho de Melo { 13459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1357c657876SArnaldo Carvalho de Melo 1361f2333aeSArnaldo Carvalho de Melo /* To avoid large error in calcX */ 1371f2333aeSArnaldo Carvalho de Melo if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { 13836729c1aSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, 1397c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, 1407c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p); 1411f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, 1421f2333aeSArnaldo Carvalho de Melo 2 * hctx->ccid3hctx_x_recv), 1431f2333aeSArnaldo Carvalho de Melo (hctx->ccid3hctx_s / 1441f2333aeSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME)); 145b6ee3d4aSArnaldo Carvalho de Melo } else { 146b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 147b6ee3d4aSArnaldo Carvalho de Melo 148b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 149b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >= 150b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt) { 1516b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv, 1526b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x) * 2, 1536b5e633aSArnaldo Carvalho de Melo usecs_div(hctx->ccid3hctx_s, 1546b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 155b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 156b6ee3d4aSArnaldo Carvalho de Melo } 1577c657876SArnaldo Carvalho de Melo } 1587c657876SArnaldo Carvalho de Melo } 1597c657876SArnaldo Carvalho de Melo 1607c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 1617c657876SArnaldo Carvalho de Melo { 1627c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 1637c657876SArnaldo Carvalho de Melo unsigned long next_tmout = 0; 16459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1657c657876SArnaldo Carvalho de Melo 1667c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 1677c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 1687c657876SArnaldo Carvalho de Melo /* Try again later. */ 1697c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 1701f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 1711f2333aeSArnaldo Carvalho de Melo jiffies + HZ / 5); 1727c657876SArnaldo Carvalho de Melo goto out; 1737c657876SArnaldo Carvalho de Melo } 1747c657876SArnaldo Carvalho de Melo 1757c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, 1767c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 1777c657876SArnaldo Carvalho de Melo 1787c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 1797c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 1807c657876SArnaldo Carvalho de Melo /* Halve send rate */ 1817c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x /= 2; 1826b5e633aSArnaldo Carvalho de Melo if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / 1836b5e633aSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME)) 1841f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = (hctx->ccid3hctx_s / 1851f2333aeSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME); 1867c657876SArnaldo Carvalho de Melo 1871f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " 1881f2333aeSArnaldo Carvalho de Melo "bytes/s\n", 1891f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 1901f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 1917c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x); 1926b5e633aSArnaldo Carvalho de Melo next_tmout = max_t(u32, 2 * usecs_div(hctx->ccid3hctx_s, 1936b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x), 1941f2333aeSArnaldo Carvalho de Melo TFRC_INITIAL_TIMEOUT); 1951f2333aeSArnaldo Carvalho de Melo /* 1961f2333aeSArnaldo Carvalho de Melo * FIXME - not sure above calculation is correct. See section 1971f2333aeSArnaldo Carvalho de Melo * 5 of CCID3 11 should adjust tx_t_ipi and double that to 1981f2333aeSArnaldo Carvalho de Melo * achieve it really 1991f2333aeSArnaldo Carvalho de Melo */ 2007c657876SArnaldo Carvalho de Melo break; 2017c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 2021f2333aeSArnaldo Carvalho de Melo /* 2031f2333aeSArnaldo Carvalho de Melo * Check if IDLE since last timeout and recv rate is less than 2041f2333aeSArnaldo Carvalho de Melo * 4 packets per RTT 2051f2333aeSArnaldo Carvalho de Melo */ 2061f2333aeSArnaldo Carvalho de Melo if (!hctx->ccid3hctx_idle || 2076b5e633aSArnaldo Carvalho de Melo (hctx->ccid3hctx_x_recv >= 2086b5e633aSArnaldo Carvalho de Melo 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { 2091f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", 2101f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2117c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2127c657876SArnaldo Carvalho de Melo /* Halve sending rate */ 2137c657876SArnaldo Carvalho de Melo 2147c657876SArnaldo Carvalho de Melo /* If (X_calc > 2 * X_recv) 2157c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2167c657876SArnaldo Carvalho de Melo * Else 2177c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2187c657876SArnaldo Carvalho de Melo */ 2191f2333aeSArnaldo Carvalho de Melo BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && 2201f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc == 0); 2217c657876SArnaldo Carvalho de Melo 2227c657876SArnaldo Carvalho de Melo /* check also if p is zero -> x_calc is infinity? */ 2237c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P || 2247c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) 2257c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, 2267c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME)); 2277c657876SArnaldo Carvalho de Melo else 2287c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; 2297c657876SArnaldo Carvalho de Melo 2307c657876SArnaldo Carvalho de Melo /* Update sending rate */ 2317c657876SArnaldo Carvalho de Melo ccid3_hc_tx_update_x(sk); 2327c657876SArnaldo Carvalho de Melo } 2336b5e633aSArnaldo Carvalho de Melo /* 2346b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2356b5e633aSArnaldo Carvalho de Melo * max(4 * R, 2 * s / X) 2366b5e633aSArnaldo Carvalho de Melo */ 237c68e64cfSArnaldo Carvalho de Melo next_tmout = max_t(u32, hctx->ccid3hctx_t_rto, 2386b5e633aSArnaldo Carvalho de Melo 2 * usecs_div(hctx->ccid3hctx_s, 2396b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x)); 2407c657876SArnaldo Carvalho de Melo break; 24159348b19SGerrit Renker case TFRC_SSTATE_NO_SENT: 24259348b19SGerrit Renker DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); 24359348b19SGerrit Renker /* fall through */ 24459348b19SGerrit Renker case TFRC_SSTATE_TERM: 2457c657876SArnaldo Carvalho de Melo goto out; 2467c657876SArnaldo Carvalho de Melo } 2477c657876SArnaldo Carvalho de Melo 2487c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2497c657876SArnaldo Carvalho de Melo jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); 2507c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 2517c657876SArnaldo Carvalho de Melo out: 2527c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2537c657876SArnaldo Carvalho de Melo sock_put(sk); 2547c657876SArnaldo Carvalho de Melo } 2557c657876SArnaldo Carvalho de Melo 25627258ee5SArnaldo Carvalho de Melo static int ccid3_hc_tx_send_packet(struct sock *sk, 25727258ee5SArnaldo Carvalho de Melo struct sk_buff *skb, int len) 2587c657876SArnaldo Carvalho de Melo { 2597c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 26059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2618c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *new_packet; 2627c657876SArnaldo Carvalho de Melo struct timeval now; 26327258ee5SArnaldo Carvalho de Melo long delay; 2647c657876SArnaldo Carvalho de Melo int rc = -ENOTCONN; 2657c657876SArnaldo Carvalho de Melo 26659348b19SGerrit Renker BUG_ON(hctx == NULL); 2671f2333aeSArnaldo Carvalho de Melo 26859d203f9SArnaldo Carvalho de Melo /* Check if pure ACK or Terminating*/ 2697c657876SArnaldo Carvalho de Melo /* 2701f2333aeSArnaldo Carvalho de Melo * XXX: We only call this function for DATA and DATAACK, on, these 2711f2333aeSArnaldo Carvalho de Melo * packets can have zero length, but why the comment about "pure ACK"? 2727c657876SArnaldo Carvalho de Melo */ 27359d203f9SArnaldo Carvalho de Melo if (unlikely(len == 0)) 2747c657876SArnaldo Carvalho de Melo goto out; 2757c657876SArnaldo Carvalho de Melo 2767c657876SArnaldo Carvalho de Melo /* See if last packet allocated was not sent */ 2778c60f3faSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 2788c60f3faSArnaldo Carvalho de Melo if (new_packet == NULL || new_packet->dccphtx_sent) { 2791f2333aeSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, 2801f2333aeSArnaldo Carvalho de Melo SLAB_ATOMIC); 2817c657876SArnaldo Carvalho de Melo 2827c657876SArnaldo Carvalho de Melo rc = -ENOBUFS; 28359d203f9SArnaldo Carvalho de Melo if (unlikely(new_packet == NULL)) { 28459348b19SGerrit Renker DCCP_WARN("%s, sk=%p, not enough mem to add to history," 28559348b19SGerrit Renker "send refused\n", dccp_role(sk), sk); 2867c657876SArnaldo Carvalho de Melo goto out; 2877c657876SArnaldo Carvalho de Melo } 2887c657876SArnaldo Carvalho de Melo 2898c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); 2907c657876SArnaldo Carvalho de Melo } 2917c657876SArnaldo Carvalho de Melo 292b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 2937c657876SArnaldo Carvalho de Melo 2947c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 2957c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 2961f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2971f2333aeSArnaldo Carvalho de Melo jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); 2987c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 2997c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3007c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3017c657876SArnaldo Carvalho de Melo 30290feeb95SGerrit Renker /* First timeout, according to [RFC 3448, 4.2], is 1 second */ 30390feeb95SGerrit Renker hctx->ccid3hctx_t_ipi = USEC_PER_SEC; 30490feeb95SGerrit Renker /* Initial delta: minimum of 0.5 sec and t_gran/2 */ 30590feeb95SGerrit Renker hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; 30690feeb95SGerrit Renker 30790feeb95SGerrit Renker /* Set t_0 for initial packet */ 3087c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 3097c657876SArnaldo Carvalho de Melo rc = 0; 3107c657876SArnaldo Carvalho de Melo break; 3117c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3127c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 313b6ee3d4aSArnaldo Carvalho de Melo delay = (timeval_delta(&now, &hctx->ccid3hctx_t_nom) - 314b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_delta); 31527258ee5SArnaldo Carvalho de Melo delay /= -1000; 3167c657876SArnaldo Carvalho de Melo /* divide by -1000 is to convert to ms and get sign right */ 317d6809c12SArnaldo Carvalho de Melo rc = delay > 0 ? delay : 0; 3187c657876SArnaldo Carvalho de Melo break; 31959348b19SGerrit Renker case TFRC_SSTATE_TERM: 32059348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 3217c657876SArnaldo Carvalho de Melo rc = -EINVAL; 3227c657876SArnaldo Carvalho de Melo break; 3237c657876SArnaldo Carvalho de Melo } 3247c657876SArnaldo Carvalho de Melo 3257c657876SArnaldo Carvalho de Melo /* Can we send? if so add options and add to packet history */ 326507d37cfSArnaldo Carvalho de Melo if (rc == 0) { 327507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 328c1734376SArnaldo Carvalho de Melo new_packet->dccphtx_ccval = 3298c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = 3308c60f3faSArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count; 33166a377c5SIan McDonald timeval_add_usecs(&hctx->ccid3hctx_t_nom, 33266a377c5SIan McDonald hctx->ccid3hctx_t_ipi); 333507d37cfSArnaldo Carvalho de Melo } 3347c657876SArnaldo Carvalho de Melo out: 3357c657876SArnaldo Carvalho de Melo return rc; 3367c657876SArnaldo Carvalho de Melo } 3377c657876SArnaldo Carvalho de Melo 3387c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len) 3397c657876SArnaldo Carvalho de Melo { 34059725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 34159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3427c657876SArnaldo Carvalho de Melo struct timeval now; 3437c657876SArnaldo Carvalho de Melo 34459348b19SGerrit Renker BUG_ON(hctx == NULL); 3457c657876SArnaldo Carvalho de Melo 346b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3477c657876SArnaldo Carvalho de Melo 3487c657876SArnaldo Carvalho de Melo /* check if we have sent a data packet */ 3497c657876SArnaldo Carvalho de Melo if (len > 0) { 3507c657876SArnaldo Carvalho de Melo unsigned long quarter_rtt; 3518c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 3527c657876SArnaldo Carvalho de Melo 3538c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 35459d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 35559348b19SGerrit Renker DCCP_WARN("packet doesn't exist in history!\n"); 3567c657876SArnaldo Carvalho de Melo return; 3577c657876SArnaldo Carvalho de Melo } 35859d203f9SArnaldo Carvalho de Melo if (unlikely(packet->dccphtx_sent)) { 35959348b19SGerrit Renker DCCP_WARN("no unsent packet in history!\n"); 3607c657876SArnaldo Carvalho de Melo return; 3617c657876SArnaldo Carvalho de Melo } 3628c60f3faSArnaldo Carvalho de Melo packet->dccphtx_tstamp = now; 3638c60f3faSArnaldo Carvalho de Melo packet->dccphtx_seqno = dp->dccps_gss; 3647c657876SArnaldo Carvalho de Melo /* 3651f2333aeSArnaldo Carvalho de Melo * Check if win_count have changed 3660e64e94eSGerrit Renker * Algorithm in "8.1. Window Counter Value" in RFC 4342. 3677c657876SArnaldo Carvalho de Melo */ 3686b5e633aSArnaldo Carvalho de Melo quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); 3696b5e633aSArnaldo Carvalho de Melo if (likely(hctx->ccid3hctx_rtt > 8)) 3706b5e633aSArnaldo Carvalho de Melo quarter_rtt /= hctx->ccid3hctx_rtt / 4; 3716b5e633aSArnaldo Carvalho de Melo 3727c657876SArnaldo Carvalho de Melo if (quarter_rtt > 0) { 3737c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3747c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + 3757c657876SArnaldo Carvalho de Melo min_t(unsigned long, quarter_rtt, 5)) % 16; 3761f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, window changed from " 3771f2333aeSArnaldo Carvalho de Melo "%u to %u!\n", 3787c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 379c1734376SArnaldo Carvalho de Melo packet->dccphtx_ccval, 3807c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count); 3817c657876SArnaldo Carvalho de Melo } 3821f2333aeSArnaldo Carvalho de Melo 3837c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 0; 384c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 3858c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 3867c657876SArnaldo Carvalho de Melo } else 3877c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", 3887c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, dp->dccps_gss); 3897c657876SArnaldo Carvalho de Melo 3907c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3917c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3927c657876SArnaldo Carvalho de Melo /* if first wasn't pure ack */ 3937c657876SArnaldo Carvalho de Melo if (len != 0) 39459348b19SGerrit Renker DCCP_CRIT("%s, First packet sent is noted " 39559348b19SGerrit Renker "as a data packet", dccp_role(sk)); 3967c657876SArnaldo Carvalho de Melo return; 3977c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3987c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 3997c657876SArnaldo Carvalho de Melo if (len > 0) { 40066a377c5SIan McDonald timeval_sub_usecs(&hctx->ccid3hctx_t_nom, 40166a377c5SIan McDonald hctx->ccid3hctx_t_ipi); 4027c657876SArnaldo Carvalho de Melo ccid3_calc_new_t_ipi(hctx); 4037c657876SArnaldo Carvalho de Melo ccid3_calc_new_delta(hctx); 404b6ee3d4aSArnaldo Carvalho de Melo timeval_add_usecs(&hctx->ccid3hctx_t_nom, 405b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 4067c657876SArnaldo Carvalho de Melo } 4077c657876SArnaldo Carvalho de Melo break; 40859348b19SGerrit Renker case TFRC_SSTATE_TERM: 40959348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 4107c657876SArnaldo Carvalho de Melo break; 4117c657876SArnaldo Carvalho de Melo } 4127c657876SArnaldo Carvalho de Melo } 4137c657876SArnaldo Carvalho de Melo 4147c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 4157c657876SArnaldo Carvalho de Melo { 41659725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 41759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 4187c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4198c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 420b0e56780SArnaldo Carvalho de Melo struct timeval now; 4217c657876SArnaldo Carvalho de Melo unsigned long next_tmout; 4221bc09869SIan McDonald u32 t_elapsed; 4237c657876SArnaldo Carvalho de Melo u32 pinv; 4247c657876SArnaldo Carvalho de Melo u32 x_recv; 4257c657876SArnaldo Carvalho de Melo u32 r_sample; 4261f2333aeSArnaldo Carvalho de Melo 42759348b19SGerrit Renker BUG_ON(hctx == NULL); 4287c657876SArnaldo Carvalho de Melo 4297c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4307c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4317c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4327c657876SArnaldo Carvalho de Melo return; 4337c657876SArnaldo Carvalho de Melo 4347c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4357c657876SArnaldo Carvalho de Melo 4361a28599aSArnaldo Carvalho de Melo t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; 4377c657876SArnaldo Carvalho de Melo x_recv = opt_recv->ccid3or_receive_rate; 4387c657876SArnaldo Carvalho de Melo pinv = opt_recv->ccid3or_loss_event_rate; 4397c657876SArnaldo Carvalho de Melo 4407c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4417c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 4427c657876SArnaldo Carvalho de Melo /* FIXME: what to do here? */ 4437c657876SArnaldo Carvalho de Melo return; 4447c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4457c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4467c657876SArnaldo Carvalho de Melo /* Calculate new round trip sample by 4477c657876SArnaldo Carvalho de Melo * R_sample = (now - t_recvdata) - t_delay */ 4487c657876SArnaldo Carvalho de Melo /* get t_recvdata from history */ 4498c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4508c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 45159d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 45259348b19SGerrit Renker DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist " 45359348b19SGerrit Renker "in history!\n", dccp_role(sk), sk, 45459d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4557c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4567c657876SArnaldo Carvalho de Melo return; 4577c657876SArnaldo Carvalho de Melo } 4587c657876SArnaldo Carvalho de Melo 4597c657876SArnaldo Carvalho de Melo /* Update RTT */ 460b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 461b0e56780SArnaldo Carvalho de Melo r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); 4621a28599aSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 46359348b19SGerrit Renker DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n", 46459348b19SGerrit Renker r_sample, t_elapsed); 4651a28599aSArnaldo Carvalho de Melo else 4661a28599aSArnaldo Carvalho de Melo r_sample -= t_elapsed; 4677c657876SArnaldo Carvalho de Melo 4687c657876SArnaldo Carvalho de Melo /* Update RTT estimate by 4697c657876SArnaldo Carvalho de Melo * If (No feedback recv) 4707c657876SArnaldo Carvalho de Melo * R = R_sample; 4717c657876SArnaldo Carvalho de Melo * Else 4727c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 4737c657876SArnaldo Carvalho de Melo * 4747c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 4757c657876SArnaldo Carvalho de Melo */ 4767c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 4777c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 4787c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 4797c657876SArnaldo Carvalho de Melo } else 4801f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + 4811f2333aeSArnaldo Carvalho de Melo r_sample / 10; 4827c657876SArnaldo Carvalho de Melo 4831f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " 4841f2333aeSArnaldo Carvalho de Melo "r_sample=%us\n", dccp_role(sk), sk, 4851f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, r_sample); 4867c657876SArnaldo Carvalho de Melo 4877c657876SArnaldo Carvalho de Melo /* Update timeout interval */ 488c68e64cfSArnaldo Carvalho de Melo hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 489cef07fd6SArnaldo Carvalho de Melo USEC_PER_SEC); 4907c657876SArnaldo Carvalho de Melo 4917c657876SArnaldo Carvalho de Melo /* Update receive rate */ 4921f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ 4937c657876SArnaldo Carvalho de Melo 4947c657876SArnaldo Carvalho de Melo /* Update loss event rate */ 4957c657876SArnaldo Carvalho de Melo if (pinv == ~0 || pinv == 0) 4967c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 0; 4977c657876SArnaldo Carvalho de Melo else { 4987c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 1000000 / pinv; 4997c657876SArnaldo Carvalho de Melo 5007c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { 5017c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = TFRC_SMALLEST_P; 5021f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", 5031f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk); 5047c657876SArnaldo Carvalho de Melo } 5057c657876SArnaldo Carvalho de Melo } 5067c657876SArnaldo Carvalho de Melo 5077c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 5087c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5097c657876SArnaldo Carvalho de Melo 5107c657876SArnaldo Carvalho de Melo /* Update sending rate */ 5117c657876SArnaldo Carvalho de Melo ccid3_hc_tx_update_x(sk); 5127c657876SArnaldo Carvalho de Melo 5137c657876SArnaldo Carvalho de Melo /* Update next send time */ 514b6ee3d4aSArnaldo Carvalho de Melo timeval_sub_usecs(&hctx->ccid3hctx_t_nom, 515b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 5167c657876SArnaldo Carvalho de Melo ccid3_calc_new_t_ipi(hctx); 517b6ee3d4aSArnaldo Carvalho de Melo timeval_add_usecs(&hctx->ccid3hctx_t_nom, 518b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 5197c657876SArnaldo Carvalho de Melo ccid3_calc_new_delta(hctx); 5207c657876SArnaldo Carvalho de Melo 5217c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5228c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5238c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 524c530cfb1SArnaldo Carvalho de Melo /* 525c530cfb1SArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible that 526c530cfb1SArnaldo Carvalho de Melo * we now can send a packet, so wake up dccp_wait_for_ccids. 527c530cfb1SArnaldo Carvalho de Melo */ 528c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5298c60f3faSArnaldo Carvalho de Melo 5301f2333aeSArnaldo Carvalho de Melo /* 5311f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5321f2333aeSArnaldo Carvalho de Melo * max(4 * R, 2 * s / X) 5331f2333aeSArnaldo Carvalho de Melo */ 534c68e64cfSArnaldo Carvalho de Melo next_tmout = max(hctx->ccid3hctx_t_rto, 5356b5e633aSArnaldo Carvalho de Melo 2 * usecs_div(hctx->ccid3hctx_s, 5366b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x)); 5377c657876SArnaldo Carvalho de Melo 5381f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " 5391f2333aeSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5401f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 5411f2333aeSArnaldo Carvalho de Melo usecs_to_jiffies(next_tmout), next_tmout); 5427c657876SArnaldo Carvalho de Melo 5437c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5447c657876SArnaldo Carvalho de Melo jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); 5457c657876SArnaldo Carvalho de Melo 5467c657876SArnaldo Carvalho de Melo /* set idle flag */ 5477c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5487c657876SArnaldo Carvalho de Melo break; 54959348b19SGerrit Renker case TFRC_SSTATE_TERM: 55059348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 5517c657876SArnaldo Carvalho de Melo break; 5527c657876SArnaldo Carvalho de Melo } 5537c657876SArnaldo Carvalho de Melo } 5547c657876SArnaldo Carvalho de Melo 5552d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) 5567c657876SArnaldo Carvalho de Melo { 55759d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5587c657876SArnaldo Carvalho de Melo 55959d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 56059d203f9SArnaldo Carvalho de Melo 5612d0817d1SArnaldo Carvalho de Melo if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) 5627c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 5632d0817d1SArnaldo Carvalho de Melo return 0; 5647c657876SArnaldo Carvalho de Melo } 5657c657876SArnaldo Carvalho de Melo 5667c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5671f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5681f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5697c657876SArnaldo Carvalho de Melo { 5707c657876SArnaldo Carvalho de Melo int rc = 0; 57159725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 57259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5737c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 5747c657876SArnaldo Carvalho de Melo 57559d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 5767c657876SArnaldo Carvalho de Melo 5777c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5787c657876SArnaldo Carvalho de Melo 5797c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5807c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5817c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5827c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5837c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5847c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5857c657876SArnaldo Carvalho de Melo } 5867c657876SArnaldo Carvalho de Melo 5877c657876SArnaldo Carvalho de Melo switch (option) { 5887c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 58959d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 59059348b19SGerrit Renker DCCP_WARN("%s, sk=%p, invalid len %d " 59159348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 59259348b19SGerrit Renker dccp_role(sk), sk, len); 5937c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5947c657876SArnaldo Carvalho de Melo } else { 59560fe62e7SAndrea Bittau opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); 5967c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", 5977c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5987c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 5997c657876SArnaldo Carvalho de Melo } 6007c657876SArnaldo Carvalho de Melo break; 6017c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 6027c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 6037c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 6047c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", 6057c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6067c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 6077c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 6087c657876SArnaldo Carvalho de Melo break; 6097c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 61059d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 61159348b19SGerrit Renker DCCP_WARN("%s, sk=%p, invalid len %d " 61259348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 61359348b19SGerrit Renker dccp_role(sk), sk, len); 6147c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6157c657876SArnaldo Carvalho de Melo } else { 61660fe62e7SAndrea Bittau opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); 6177c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", 6187c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6197c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 6207c657876SArnaldo Carvalho de Melo } 6217c657876SArnaldo Carvalho de Melo break; 6227c657876SArnaldo Carvalho de Melo } 6237c657876SArnaldo Carvalho de Melo 6247c657876SArnaldo Carvalho de Melo return rc; 6257c657876SArnaldo Carvalho de Melo } 6267c657876SArnaldo Carvalho de Melo 62791f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 6287c657876SArnaldo Carvalho de Melo { 6297c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 63091f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 6317c657876SArnaldo Carvalho de Melo 632a84ffe43SArnaldo Carvalho de Melo if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && 633a84ffe43SArnaldo Carvalho de Melo dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) 634a84ffe43SArnaldo Carvalho de Melo hctx->ccid3hctx_s = dp->dccps_packet_size; 6357c657876SArnaldo Carvalho de Melo else 6367c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE; 6377c657876SArnaldo Carvalho de Melo 6381f2333aeSArnaldo Carvalho de Melo /* Set transmission rate to 1 packet per second */ 6391f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = hctx->ccid3hctx_s; 640c68e64cfSArnaldo Carvalho de Melo hctx->ccid3hctx_t_rto = USEC_PER_SEC; 6417c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6427c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 643aa5d7df3SArnaldo Carvalho de Melo 644aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; 645aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 6467c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6477c657876SArnaldo Carvalho de Melo 6487c657876SArnaldo Carvalho de Melo return 0; 6497c657876SArnaldo Carvalho de Melo } 6507c657876SArnaldo Carvalho de Melo 6517c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6527c657876SArnaldo Carvalho de Melo { 65359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6547c657876SArnaldo Carvalho de Melo 6557c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 6567c657876SArnaldo Carvalho de Melo 6577c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6587c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6597c657876SArnaldo Carvalho de Melo 6607c657876SArnaldo Carvalho de Melo /* Empty packet history */ 6618c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 6627c657876SArnaldo Carvalho de Melo } 6637c657876SArnaldo Carvalho de Melo 6647c657876SArnaldo Carvalho de Melo /* 6657c657876SArnaldo Carvalho de Melo * RX Half Connection methods 6667c657876SArnaldo Carvalho de Melo */ 6677c657876SArnaldo Carvalho de Melo 66856724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6697c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6707c657876SArnaldo Carvalho de Melo { 6717c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6727c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6737c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6747c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6757c657876SArnaldo Carvalho de Melo }; 6767c657876SArnaldo Carvalho de Melo 6777c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6787c657876SArnaldo Carvalho de Melo } 6797c657876SArnaldo Carvalho de Melo #endif 6807c657876SArnaldo Carvalho de Melo 681c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 6821f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 6837c657876SArnaldo Carvalho de Melo { 68459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6857c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 6867c657876SArnaldo Carvalho de Melo 6877c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 6881f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 6891f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 6907c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 6917c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 6927c657876SArnaldo Carvalho de Melo } 6937c657876SArnaldo Carvalho de Melo 6947c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 6957c657876SArnaldo Carvalho de Melo { 69659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6977c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 6988c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 699b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 7007c657876SArnaldo Carvalho de Melo 7017c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 7027c657876SArnaldo Carvalho de Melo 703b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 704b6ee3d4aSArnaldo Carvalho de Melo 7057c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 7067c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 7077c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 7087c657876SArnaldo Carvalho de Melo break; 7097c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: { 710b6ee3d4aSArnaldo Carvalho de Melo const u32 delta = timeval_delta(&now, 711b6ee3d4aSArnaldo Carvalho de Melo &hcrx->ccid3hcrx_tstamp_last_feedback); 71227ae543eSArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, 71327ae543eSArnaldo Carvalho de Melo delta); 7147c657876SArnaldo Carvalho de Melo } 7157c657876SArnaldo Carvalho de Melo break; 71659348b19SGerrit Renker case TFRC_RSTATE_TERM: 71759348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 7187c657876SArnaldo Carvalho de Melo return; 7197c657876SArnaldo Carvalho de Melo } 7207c657876SArnaldo Carvalho de Melo 7218c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 72259d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 72359348b19SGerrit Renker DCCP_WARN("%s, sk=%p, no data packet in history!\n", 72459348b19SGerrit Renker dccp_role(sk), sk); 7257c657876SArnaldo Carvalho de Melo return; 7267c657876SArnaldo Carvalho de Melo } 7277c657876SArnaldo Carvalho de Melo 728b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 72966a377c5SIan McDonald hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; 7307c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7317c657876SArnaldo Carvalho de Melo 7327c657876SArnaldo Carvalho de Melo /* Convert to multiples of 10us */ 733b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time = 734b6ee3d4aSArnaldo Carvalho de Melo timeval_delta(&now, &packet->dccphrx_tstamp) / 10; 7357c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 7367c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = ~0; 7377c657876SArnaldo Carvalho de Melo else 7387c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 739507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7407c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7417c657876SArnaldo Carvalho de Melo } 7427c657876SArnaldo Carvalho de Melo 7432d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7447c657876SArnaldo Carvalho de Melo { 74559d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 74660fe62e7SAndrea Bittau __be32 x_recv, pinv; 7477c657876SArnaldo Carvalho de Melo 74859d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 74959d203f9SArnaldo Carvalho de Melo 75059d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7512d0817d1SArnaldo Carvalho de Melo return 0; 7527c657876SArnaldo Carvalho de Melo 75366a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 7544fded33bSArnaldo Carvalho de Melo 7554fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7562d0817d1SArnaldo Carvalho de Melo return 0; 7574fded33bSArnaldo Carvalho de Melo 7584fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7594fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7602d0817d1SArnaldo Carvalho de Melo 7612d0817d1SArnaldo Carvalho de Melo if ((hcrx->ccid3hcrx_elapsed_time != 0 && 7622d0817d1SArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 7632d0817d1SArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time)) || 7642d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb) || 7654fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7662d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7674fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 7682d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 7692d0817d1SArnaldo Carvalho de Melo return -1; 7702d0817d1SArnaldo Carvalho de Melo 7712d0817d1SArnaldo Carvalho de Melo return 0; 7727c657876SArnaldo Carvalho de Melo } 7737c657876SArnaldo Carvalho de Melo 7747c657876SArnaldo Carvalho de Melo /* calculate first loss interval 7757c657876SArnaldo Carvalho de Melo * 7767c657876SArnaldo Carvalho de Melo * returns estimated loss interval in usecs */ 7777c657876SArnaldo Carvalho de Melo 7787c657876SArnaldo Carvalho de Melo static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) 7797c657876SArnaldo Carvalho de Melo { 78059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7818c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *entry, *next, *tail = NULL; 7827c657876SArnaldo Carvalho de Melo u32 rtt, delta, x_recv, fval, p, tmp2; 783b6ee3d4aSArnaldo Carvalho de Melo struct timeval tstamp = { 0, }; 7847c657876SArnaldo Carvalho de Melo int interval = 0; 7857c657876SArnaldo Carvalho de Melo int win_count = 0; 7867c657876SArnaldo Carvalho de Melo int step = 0; 7877c657876SArnaldo Carvalho de Melo u64 tmp1; 7887c657876SArnaldo Carvalho de Melo 7898c60f3faSArnaldo Carvalho de Melo list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, 7908c60f3faSArnaldo Carvalho de Melo dccphrx_node) { 7918c60f3faSArnaldo Carvalho de Melo if (dccp_rx_hist_entry_data_packet(entry)) { 7927c657876SArnaldo Carvalho de Melo tail = entry; 7937c657876SArnaldo Carvalho de Melo 7947c657876SArnaldo Carvalho de Melo switch (step) { 7957c657876SArnaldo Carvalho de Melo case 0: 7968c60f3faSArnaldo Carvalho de Melo tstamp = entry->dccphrx_tstamp; 797c1734376SArnaldo Carvalho de Melo win_count = entry->dccphrx_ccval; 7987c657876SArnaldo Carvalho de Melo step = 1; 7997c657876SArnaldo Carvalho de Melo break; 8007c657876SArnaldo Carvalho de Melo case 1: 801c1734376SArnaldo Carvalho de Melo interval = win_count - entry->dccphrx_ccval; 8027c657876SArnaldo Carvalho de Melo if (interval < 0) 8037c657876SArnaldo Carvalho de Melo interval += TFRC_WIN_COUNT_LIMIT; 8047c657876SArnaldo Carvalho de Melo if (interval > 4) 8057c657876SArnaldo Carvalho de Melo goto found; 8067c657876SArnaldo Carvalho de Melo break; 8077c657876SArnaldo Carvalho de Melo } 8087c657876SArnaldo Carvalho de Melo } 8097c657876SArnaldo Carvalho de Melo } 8107c657876SArnaldo Carvalho de Melo 81159d203f9SArnaldo Carvalho de Melo if (unlikely(step == 0)) { 81259348b19SGerrit Renker DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", 81359348b19SGerrit Renker dccp_role(sk), sk); 8147c657876SArnaldo Carvalho de Melo return ~0; 8157c657876SArnaldo Carvalho de Melo } 8167c657876SArnaldo Carvalho de Melo 81759d203f9SArnaldo Carvalho de Melo if (unlikely(interval == 0)) { 81859348b19SGerrit Renker DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." 81959348b19SGerrit Renker "Defaulting to 1\n", dccp_role(sk), sk); 8207c657876SArnaldo Carvalho de Melo interval = 1; 8217c657876SArnaldo Carvalho de Melo } 8227c657876SArnaldo Carvalho de Melo found: 82366a377c5SIan McDonald if (!tail) { 82459348b19SGerrit Renker DCCP_CRIT("tail is null\n"); 82566a377c5SIan McDonald return ~0; 82666a377c5SIan McDonald } 827b6ee3d4aSArnaldo Carvalho de Melo rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; 8287c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", 8297c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, rtt); 83059348b19SGerrit Renker 83159348b19SGerrit Renker if (rtt == 0) { 83259348b19SGerrit Renker DCCP_WARN("RTT==0, setting to 1\n"); 8337c657876SArnaldo Carvalho de Melo rtt = 1; 83459348b19SGerrit Renker } 8357c657876SArnaldo Carvalho de Melo 836b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &tstamp); 837b0e56780SArnaldo Carvalho de Melo delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); 838b0e56780SArnaldo Carvalho de Melo x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); 8397c657876SArnaldo Carvalho de Melo 84066a377c5SIan McDonald if (x_recv == 0) 84166a377c5SIan McDonald x_recv = hcrx->ccid3hcrx_x_recv; 84266a377c5SIan McDonald 8437c657876SArnaldo Carvalho de Melo tmp1 = (u64)x_recv * (u64)rtt; 8447c657876SArnaldo Carvalho de Melo do_div(tmp1,10000000); 8457c657876SArnaldo Carvalho de Melo tmp2 = (u32)tmp1; 84666a377c5SIan McDonald 84766a377c5SIan McDonald if (!tmp2) { 84859348b19SGerrit Renker DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv, rtt); 84966a377c5SIan McDonald return ~0; 85066a377c5SIan McDonald } 85166a377c5SIan McDonald 8527c657876SArnaldo Carvalho de Melo fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; 8537c657876SArnaldo Carvalho de Melo /* do not alter order above or you will get overflow on 32 bit */ 85436729c1aSArnaldo Carvalho de Melo p = tfrc_calc_x_reverse_lookup(fval); 8551f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " 8561f2333aeSArnaldo Carvalho de Melo "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 8577c657876SArnaldo Carvalho de Melo 8587c657876SArnaldo Carvalho de Melo if (p == 0) 8597c657876SArnaldo Carvalho de Melo return ~0; 8607c657876SArnaldo Carvalho de Melo else 8617c657876SArnaldo Carvalho de Melo return 1000000 / p; 8627c657876SArnaldo Carvalho de Melo } 8637c657876SArnaldo Carvalho de Melo 8647c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) 8657c657876SArnaldo Carvalho de Melo { 86659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 867fc747e82SIan McDonald struct dccp_li_hist_entry *head; 86866a377c5SIan McDonald u64 seq_temp; 8697c657876SArnaldo Carvalho de Melo 87066a377c5SIan McDonald if (list_empty(&hcrx->ccid3hcrx_li_hist)) { 87166a377c5SIan McDonald if (!dccp_li_hist_interval_new(ccid3_li_hist, 87266a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) 873ae6706f0SArnaldo Carvalho de Melo return; 87466a377c5SIan McDonald 875fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 876fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 877fc747e82SIan McDonald head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); 87866a377c5SIan McDonald } else { 87966a377c5SIan McDonald struct dccp_li_hist_entry *entry; 88066a377c5SIan McDonald struct list_head *tail; 88166a377c5SIan McDonald 882fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 883fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 88466a377c5SIan McDonald /* FIXME win count check removed as was wrong */ 88566a377c5SIan McDonald /* should make this check with receive history */ 88666a377c5SIan McDonald /* and compare there as per section 10.2 of RFC4342 */ 88766a377c5SIan McDonald 88866a377c5SIan McDonald /* new loss event detected */ 88966a377c5SIan McDonald /* calculate last interval length */ 89066a377c5SIan McDonald seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); 89166a377c5SIan McDonald entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); 89266a377c5SIan McDonald 89366a377c5SIan McDonald if (entry == NULL) { 89459348b19SGerrit Renker DCCP_BUG("out of memory - can not allocate entry"); 89566a377c5SIan McDonald return; 8967c657876SArnaldo Carvalho de Melo } 8977c657876SArnaldo Carvalho de Melo 89866a377c5SIan McDonald list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); 89966a377c5SIan McDonald 90066a377c5SIan McDonald tail = hcrx->ccid3hcrx_li_hist.prev; 90166a377c5SIan McDonald list_del(tail); 90266a377c5SIan McDonald kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); 90366a377c5SIan McDonald 90466a377c5SIan McDonald /* Create the newest interval */ 90566a377c5SIan McDonald entry->dccplih_seqno = seq_loss; 90666a377c5SIan McDonald entry->dccplih_interval = seq_temp; 90766a377c5SIan McDonald entry->dccplih_win_count = win_loss; 90866a377c5SIan McDonald } 90966a377c5SIan McDonald } 91066a377c5SIan McDonald 91166a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 91266a377c5SIan McDonald struct dccp_rx_hist_entry *packet) 9137c657876SArnaldo Carvalho de Melo { 91459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 91566a377c5SIan McDonald struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); 91666a377c5SIan McDonald u64 seqno = packet->dccphrx_seqno; 91766a377c5SIan McDonald u64 tmp_seqno; 91866a377c5SIan McDonald int loss = 0; 91966a377c5SIan McDonald u8 ccval; 9207c657876SArnaldo Carvalho de Melo 92166a377c5SIan McDonald 92266a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 92366a377c5SIan McDonald 92466a377c5SIan McDonald if (!rx_hist || 92566a377c5SIan McDonald follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 92666a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 92766a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 92866a377c5SIan McDonald goto detect_out; 92966a377c5SIan McDonald } 93066a377c5SIan McDonald 93166a377c5SIan McDonald 93266a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 93366a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 93466a377c5SIan McDonald loss = 1; 93566a377c5SIan McDonald ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, 93666a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 93766a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 93866a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 93966a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 94066a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 94166a377c5SIan McDonald while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 94266a377c5SIan McDonald tmp_seqno, &ccval)) { 94366a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 94466a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 94566a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 94666a377c5SIan McDonald } 94766a377c5SIan McDonald } 94866a377c5SIan McDonald 94966a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 95066a377c5SIan McDonald /* but works at moment */ 95166a377c5SIan McDonald if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 95266a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 95366a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 95466a377c5SIan McDonald } 95566a377c5SIan McDonald 95666a377c5SIan McDonald detect_out: 95766a377c5SIan McDonald dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 95866a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 95966a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 96066a377c5SIan McDonald return loss; 9617c657876SArnaldo Carvalho de Melo } 9627c657876SArnaldo Carvalho de Melo 9637c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 9647c657876SArnaldo Carvalho de Melo { 96559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9664fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 9678c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 9687c657876SArnaldo Carvalho de Melo struct timeval now; 96966a377c5SIan McDonald u32 p_prev, rtt_prev, r_sample, t_elapsed; 97066a377c5SIan McDonald int loss; 9711f2333aeSArnaldo Carvalho de Melo 97259348b19SGerrit Renker BUG_ON(hcrx == NULL); 9737c657876SArnaldo Carvalho de Melo 97459725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 9754fded33bSArnaldo Carvalho de Melo 9767c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 9777c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 9787c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 9797c657876SArnaldo Carvalho de Melo return; 9807c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 9814fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 9827c657876SArnaldo Carvalho de Melo break; 98366a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 984b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 985b3a3077dSArnaldo Carvalho de Melo timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); 986b3a3077dSArnaldo Carvalho de Melo r_sample = timeval_usecs(&now); 987b3a3077dSArnaldo Carvalho de Melo t_elapsed = opt_recv->dccpor_elapsed_time * 10; 988b3a3077dSArnaldo Carvalho de Melo 989b3a3077dSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 99059348b19SGerrit Renker DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", 99159348b19SGerrit Renker r_sample, t_elapsed); 992b3a3077dSArnaldo Carvalho de Melo else 993b3a3077dSArnaldo Carvalho de Melo r_sample -= t_elapsed; 994b3a3077dSArnaldo Carvalho de Melo 995b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 996b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 997b3a3077dSArnaldo Carvalho de Melo else 998b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 999b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 1000b3a3077dSArnaldo Carvalho de Melo 100166a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 100266a377c5SIan McDonald ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", 10034fded33bSArnaldo Carvalho de Melo dccp_role(sk), hcrx->ccid3hcrx_rtt, 10044fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 10057c657876SArnaldo Carvalho de Melo break; 10067c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 10077c657876SArnaldo Carvalho de Melo break; 100859d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 10097c657876SArnaldo Carvalho de Melo return; 10107c657876SArnaldo Carvalho de Melo } 10117c657876SArnaldo Carvalho de Melo 1012b0e56780SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, 10138c60f3faSArnaldo Carvalho de Melo skb, SLAB_ATOMIC); 101459d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 101559348b19SGerrit Renker DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " 101659348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 10177c657876SArnaldo Carvalho de Melo return; 10187c657876SArnaldo Carvalho de Melo } 10197c657876SArnaldo Carvalho de Melo 102066a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 10217c657876SArnaldo Carvalho de Melo 10227c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 10237c657876SArnaldo Carvalho de Melo return; 10247c657876SArnaldo Carvalho de Melo 10257c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 10267c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 10271f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " 10281f2333aeSArnaldo Carvalho de Melo "feedback\n", 10291f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 10301f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 10317c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10327c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 10337c657876SArnaldo Carvalho de Melo return; 10347c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 10351f2333aeSArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv += skb->len - 10361f2333aeSArnaldo Carvalho de Melo dccp_hdr(skb)->dccph_doff * 4; 103766a377c5SIan McDonald if (loss) 1038b6ee3d4aSArnaldo Carvalho de Melo break; 1039b6ee3d4aSArnaldo Carvalho de Melo 1040b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 1041b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= 10424fded33bSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt) { 1043b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 10447c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10457c657876SArnaldo Carvalho de Melo } 10467c657876SArnaldo Carvalho de Melo return; 104759348b19SGerrit Renker case TFRC_RSTATE_TERM: 104859348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 10497c657876SArnaldo Carvalho de Melo return; 10507c657876SArnaldo Carvalho de Melo } 10517c657876SArnaldo Carvalho de Melo 10527c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 10534fded33bSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", 10544fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 10557c657876SArnaldo Carvalho de Melo 10567c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 10577c657876SArnaldo Carvalho de Melo 10587c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 1059c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 1060c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 1061c0996660SIan McDonald 10627c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 1063c0996660SIan McDonald if (i_mean != 0) 1064c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 106559348b19SGerrit Renker } else 106659348b19SGerrit Renker DCCP_BUG("empty loss history"); 10677c657876SArnaldo Carvalho de Melo 10687c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 10697c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10707c657876SArnaldo Carvalho de Melo return; 10717c657876SArnaldo Carvalho de Melo } 10727c657876SArnaldo Carvalho de Melo } 10737c657876SArnaldo Carvalho de Melo 107491f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 10757c657876SArnaldo Carvalho de Melo { 10767c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 107791f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 10787c657876SArnaldo Carvalho de Melo 10797c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 10807c657876SArnaldo Carvalho de Melo 1081a84ffe43SArnaldo Carvalho de Melo if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && 1082a84ffe43SArnaldo Carvalho de Melo dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) 1083a84ffe43SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = dp->dccps_packet_size; 10847c657876SArnaldo Carvalho de Melo else 10857c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE; 10867c657876SArnaldo Carvalho de Melo 10877c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 10887c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 1089ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 1090b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); 1091954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; 1092954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ 10937c657876SArnaldo Carvalho de Melo return 0; 10947c657876SArnaldo Carvalho de Melo } 10957c657876SArnaldo Carvalho de Melo 10967c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 10977c657876SArnaldo Carvalho de Melo { 109859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 10997c657876SArnaldo Carvalho de Melo 110059d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 11017c657876SArnaldo Carvalho de Melo 11027c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 11037c657876SArnaldo Carvalho de Melo 11047c657876SArnaldo Carvalho de Melo /* Empty packet history */ 11058c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 11067c657876SArnaldo Carvalho de Melo 11077c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 1108ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); 11097c657876SArnaldo Carvalho de Melo } 11107c657876SArnaldo Carvalho de Melo 11112babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 11122babe1f6SArnaldo Carvalho de Melo { 111359725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 11142babe1f6SArnaldo Carvalho de Melo 111559c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 111659c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 111759c2353dSArnaldo Carvalho de Melo return; 111859c2353dSArnaldo Carvalho de Melo 111959d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 11202babe1f6SArnaldo Carvalho de Melo 11212babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 11222babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 11232babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 11242babe1f6SArnaldo Carvalho de Melo } 11252babe1f6SArnaldo Carvalho de Melo 11262babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 11272babe1f6SArnaldo Carvalho de Melo { 112859725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 11292babe1f6SArnaldo Carvalho de Melo 113059c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 113159c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 113259c2353dSArnaldo Carvalho de Melo return; 113359c2353dSArnaldo Carvalho de Melo 113459d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 11352babe1f6SArnaldo Carvalho de Melo 11362babe1f6SArnaldo Carvalho de Melo info->tcpi_rto = hctx->ccid3hctx_t_rto; 11372babe1f6SArnaldo Carvalho de Melo info->tcpi_rtt = hctx->ccid3hctx_rtt; 11382babe1f6SArnaldo Carvalho de Melo } 11392babe1f6SArnaldo Carvalho de Melo 114088f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 114188f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 114288f964dbSArnaldo Carvalho de Melo { 114388f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 114488f964dbSArnaldo Carvalho de Melo const void *val; 114588f964dbSArnaldo Carvalho de Melo 114688f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 114788f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 114888f964dbSArnaldo Carvalho de Melo return -EINVAL; 114988f964dbSArnaldo Carvalho de Melo 115088f964dbSArnaldo Carvalho de Melo switch (optname) { 115188f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 115288f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 115388f964dbSArnaldo Carvalho de Melo return -EINVAL; 115488f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 115588f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 115688f964dbSArnaldo Carvalho de Melo break; 115788f964dbSArnaldo Carvalho de Melo default: 115888f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 115988f964dbSArnaldo Carvalho de Melo } 116088f964dbSArnaldo Carvalho de Melo 116188f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 116288f964dbSArnaldo Carvalho de Melo return -EFAULT; 116388f964dbSArnaldo Carvalho de Melo 116488f964dbSArnaldo Carvalho de Melo return 0; 116588f964dbSArnaldo Carvalho de Melo } 116688f964dbSArnaldo Carvalho de Melo 116788f964dbSArnaldo Carvalho de Melo static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 116888f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 116988f964dbSArnaldo Carvalho de Melo { 117088f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 117188f964dbSArnaldo Carvalho de Melo const void *val; 117288f964dbSArnaldo Carvalho de Melo 117388f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 117488f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 117588f964dbSArnaldo Carvalho de Melo return -EINVAL; 117688f964dbSArnaldo Carvalho de Melo 117788f964dbSArnaldo Carvalho de Melo switch (optname) { 117888f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_TX_INFO: 117988f964dbSArnaldo Carvalho de Melo if (len < sizeof(hctx->ccid3hctx_tfrc)) 118088f964dbSArnaldo Carvalho de Melo return -EINVAL; 118188f964dbSArnaldo Carvalho de Melo len = sizeof(hctx->ccid3hctx_tfrc); 118288f964dbSArnaldo Carvalho de Melo val = &hctx->ccid3hctx_tfrc; 118388f964dbSArnaldo Carvalho de Melo break; 118488f964dbSArnaldo Carvalho de Melo default: 118588f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 118688f964dbSArnaldo Carvalho de Melo } 118788f964dbSArnaldo Carvalho de Melo 118888f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 118988f964dbSArnaldo Carvalho de Melo return -EFAULT; 119088f964dbSArnaldo Carvalho de Melo 119188f964dbSArnaldo Carvalho de Melo return 0; 119288f964dbSArnaldo Carvalho de Melo } 119388f964dbSArnaldo Carvalho de Melo 119491f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 11953dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 11967c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 11977c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 119891f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 11997c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 12007c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 12017c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 12027c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 12037c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 12047c657876SArnaldo Carvalho de Melo .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, 12057c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 120691f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 12077c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 12087c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 12097c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 12107c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 12112babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 12122babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 121388f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 121488f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 12157c657876SArnaldo Carvalho de Melo }; 12167c657876SArnaldo Carvalho de Melo 121756724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 12187c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 12197c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 122056724aa4SGerrit Renker #endif 12217c657876SArnaldo Carvalho de Melo 12227c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 12237c657876SArnaldo Carvalho de Melo { 12248c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 12257c657876SArnaldo Carvalho de Melo 12268c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 12278c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 12287c657876SArnaldo Carvalho de Melo goto out; 12297c657876SArnaldo Carvalho de Melo 12308c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 12318c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 12328c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 12337c657876SArnaldo Carvalho de Melo 1234ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = dccp_li_hist_new("ccid3"); 1235ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist == NULL) 12368c60f3faSArnaldo Carvalho de Melo goto out_free_tx; 12377c657876SArnaldo Carvalho de Melo 12387c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 12397c657876SArnaldo Carvalho de Melo if (rc != 0) 12407c657876SArnaldo Carvalho de Melo goto out_free_loss_interval_history; 12417c657876SArnaldo Carvalho de Melo out: 12427c657876SArnaldo Carvalho de Melo return rc; 12438c60f3faSArnaldo Carvalho de Melo 12447c657876SArnaldo Carvalho de Melo out_free_loss_interval_history: 1245ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1246ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12478c60f3faSArnaldo Carvalho de Melo out_free_tx: 12488c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12498c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12508c60f3faSArnaldo Carvalho de Melo out_free_rx: 12518c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12528c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12537c657876SArnaldo Carvalho de Melo goto out; 12547c657876SArnaldo Carvalho de Melo } 12557c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 12567c657876SArnaldo Carvalho de Melo 12577c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 12587c657876SArnaldo Carvalho de Melo { 12597c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 12607c657876SArnaldo Carvalho de Melo 12618c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 12628c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12638c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12647c657876SArnaldo Carvalho de Melo } 12658c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 12668c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12678c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12687c657876SArnaldo Carvalho de Melo } 1269ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist != NULL) { 1270ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1271ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12727c657876SArnaldo Carvalho de Melo } 12737c657876SArnaldo Carvalho de Melo } 12747c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 12757c657876SArnaldo Carvalho de Melo 1276e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 12771f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 12787c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 12797c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 12807c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1281