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 63cfc3c525SArnaldo Carvalho de Melo static int ccid3_debug; 647c657876SArnaldo Carvalho de Melo 65cfc3c525SArnaldo Carvalho de Melo #ifdef CCID3_DEBUG 667c657876SArnaldo Carvalho de Melo #define ccid3_pr_debug(format, a...) \ 677c657876SArnaldo Carvalho de Melo do { if (ccid3_debug) \ 687c657876SArnaldo Carvalho de Melo printk(KERN_DEBUG "%s: " format, __FUNCTION__, ##a); \ 697c657876SArnaldo Carvalho de Melo } while (0) 707c657876SArnaldo Carvalho de Melo #else 717c657876SArnaldo Carvalho de Melo #define ccid3_pr_debug(format, a...) 727c657876SArnaldo Carvalho de Melo #endif 737c657876SArnaldo Carvalho de Melo 74a1d3a355SArnaldo Carvalho de Melo static struct dccp_tx_hist *ccid3_tx_hist; 75a1d3a355SArnaldo Carvalho de Melo static struct dccp_rx_hist *ccid3_rx_hist; 76ae6706f0SArnaldo Carvalho de Melo static struct dccp_li_hist *ccid3_li_hist; 777c657876SArnaldo Carvalho de Melo 787c657876SArnaldo Carvalho de Melo /* TFRC sender states */ 797c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states { 807c657876SArnaldo Carvalho de Melo TFRC_SSTATE_NO_SENT = 1, 817c657876SArnaldo Carvalho de Melo TFRC_SSTATE_NO_FBACK, 827c657876SArnaldo Carvalho de Melo TFRC_SSTATE_FBACK, 837c657876SArnaldo Carvalho de Melo TFRC_SSTATE_TERM, 847c657876SArnaldo Carvalho de Melo }; 857c657876SArnaldo Carvalho de Melo 867c657876SArnaldo Carvalho de Melo #ifdef CCID3_DEBUG 877c657876SArnaldo Carvalho de Melo static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) 887c657876SArnaldo Carvalho de Melo { 897c657876SArnaldo Carvalho de Melo static char *ccid3_state_names[] = { 907c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_SENT] = "NO_SENT", 917c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", 927c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_FBACK] = "FBACK", 937c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_TERM] = "TERM", 947c657876SArnaldo Carvalho de Melo }; 957c657876SArnaldo Carvalho de Melo 967c657876SArnaldo Carvalho de Melo return ccid3_state_names[state]; 977c657876SArnaldo Carvalho de Melo } 987c657876SArnaldo Carvalho de Melo #endif 997c657876SArnaldo Carvalho de Melo 100c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_tx_set_state(struct sock *sk, 1011f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_tx_states state) 1027c657876SArnaldo Carvalho de Melo { 10359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1047c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; 1057c657876SArnaldo Carvalho de Melo 1067c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 1071f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_tx_state_name(oldstate), 1081f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(state)); 1097c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 1107c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = state; 1117c657876SArnaldo Carvalho de Melo } 1127c657876SArnaldo Carvalho de Melo 1137c657876SArnaldo Carvalho de Melo /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */ 1147c657876SArnaldo Carvalho de Melo static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock *hctx) 1157c657876SArnaldo Carvalho de Melo { 1166b5e633aSArnaldo Carvalho de Melo /* 1176b5e633aSArnaldo Carvalho de Melo * If no feedback spec says t_ipi is 1 second (set elsewhere and then 1186b5e633aSArnaldo Carvalho de Melo * doubles after every no feedback timer (separate function) 1196b5e633aSArnaldo Carvalho de Melo */ 1206b5e633aSArnaldo Carvalho de Melo if (hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK) 1216b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s, 1226b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x); 1237c657876SArnaldo Carvalho de Melo } 1247c657876SArnaldo Carvalho de Melo 1257c657876SArnaldo Carvalho de Melo /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ 1267c657876SArnaldo Carvalho de Melo static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx) 1277c657876SArnaldo Carvalho de Melo { 1281f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, 1291f2333aeSArnaldo Carvalho de Melo TFRC_OPSYS_HALF_TIME_GRAN); 1307c657876SArnaldo Carvalho de Melo } 1317c657876SArnaldo Carvalho de Melo 1327c657876SArnaldo Carvalho de Melo /* 1337c657876SArnaldo Carvalho de Melo * Update X by 1347c657876SArnaldo Carvalho de Melo * If (p > 0) 1357c657876SArnaldo Carvalho de Melo * x_calc = calcX(s, R, p); 1367c657876SArnaldo Carvalho de Melo * X = max(min(X_calc, 2 * X_recv), s / t_mbi); 1377c657876SArnaldo Carvalho de Melo * Else 1387c657876SArnaldo Carvalho de Melo * If (now - tld >= R) 1397c657876SArnaldo Carvalho de Melo * X = max(min(2 * X, 2 * X_recv), s / R); 1407c657876SArnaldo Carvalho de Melo * tld = now; 1417c657876SArnaldo Carvalho de Melo */ 1427c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_update_x(struct sock *sk) 1437c657876SArnaldo Carvalho de Melo { 14459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1457c657876SArnaldo Carvalho de Melo 1461f2333aeSArnaldo Carvalho de Melo /* To avoid large error in calcX */ 1471f2333aeSArnaldo Carvalho de Melo if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { 14836729c1aSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, 1497c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, 1507c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p); 1511f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, 1521f2333aeSArnaldo Carvalho de Melo 2 * hctx->ccid3hctx_x_recv), 1531f2333aeSArnaldo Carvalho de Melo (hctx->ccid3hctx_s / 1541f2333aeSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME)); 155b6ee3d4aSArnaldo Carvalho de Melo } else { 156b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 157b6ee3d4aSArnaldo Carvalho de Melo 158b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 159b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >= 160b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt) { 1616b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv, 1626b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x) * 2, 1636b5e633aSArnaldo Carvalho de Melo usecs_div(hctx->ccid3hctx_s, 1646b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 165b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 166b6ee3d4aSArnaldo Carvalho de Melo } 1677c657876SArnaldo Carvalho de Melo } 1687c657876SArnaldo Carvalho de Melo } 1697c657876SArnaldo Carvalho de Melo 1707c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 1717c657876SArnaldo Carvalho de Melo { 1727c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 1737c657876SArnaldo Carvalho de Melo unsigned long next_tmout = 0; 17459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1757c657876SArnaldo Carvalho de Melo 1767c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 1777c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 1787c657876SArnaldo Carvalho de Melo /* Try again later. */ 1797c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 1801f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 1811f2333aeSArnaldo Carvalho de Melo jiffies + HZ / 5); 1827c657876SArnaldo Carvalho de Melo goto out; 1837c657876SArnaldo Carvalho de Melo } 1847c657876SArnaldo Carvalho de Melo 1857c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, 1867c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 1877c657876SArnaldo Carvalho de Melo 1887c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 1897c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_TERM: 1907c657876SArnaldo Carvalho de Melo goto out; 1917c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 1927c657876SArnaldo Carvalho de Melo /* Halve send rate */ 1937c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x /= 2; 1946b5e633aSArnaldo Carvalho de Melo if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / 1956b5e633aSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME)) 1961f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = (hctx->ccid3hctx_s / 1971f2333aeSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME); 1987c657876SArnaldo Carvalho de Melo 1991f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " 2001f2333aeSArnaldo Carvalho de Melo "bytes/s\n", 2011f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2021f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 2037c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x); 2046b5e633aSArnaldo Carvalho de Melo next_tmout = max_t(u32, 2 * usecs_div(hctx->ccid3hctx_s, 2056b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x), 2061f2333aeSArnaldo Carvalho de Melo TFRC_INITIAL_TIMEOUT); 2071f2333aeSArnaldo Carvalho de Melo /* 2081f2333aeSArnaldo Carvalho de Melo * FIXME - not sure above calculation is correct. See section 2091f2333aeSArnaldo Carvalho de Melo * 5 of CCID3 11 should adjust tx_t_ipi and double that to 2101f2333aeSArnaldo Carvalho de Melo * achieve it really 2111f2333aeSArnaldo Carvalho de Melo */ 2127c657876SArnaldo Carvalho de Melo break; 2137c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 2141f2333aeSArnaldo Carvalho de Melo /* 2151f2333aeSArnaldo Carvalho de Melo * Check if IDLE since last timeout and recv rate is less than 2161f2333aeSArnaldo Carvalho de Melo * 4 packets per RTT 2171f2333aeSArnaldo Carvalho de Melo */ 2181f2333aeSArnaldo Carvalho de Melo if (!hctx->ccid3hctx_idle || 2196b5e633aSArnaldo Carvalho de Melo (hctx->ccid3hctx_x_recv >= 2206b5e633aSArnaldo Carvalho de Melo 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { 2211f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", 2221f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2237c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2247c657876SArnaldo Carvalho de Melo /* Halve sending rate */ 2257c657876SArnaldo Carvalho de Melo 2267c657876SArnaldo Carvalho de Melo /* If (X_calc > 2 * X_recv) 2277c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2287c657876SArnaldo Carvalho de Melo * Else 2297c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2307c657876SArnaldo Carvalho de Melo */ 2311f2333aeSArnaldo Carvalho de Melo BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && 2321f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc == 0); 2337c657876SArnaldo Carvalho de Melo 2347c657876SArnaldo Carvalho de Melo /* check also if p is zero -> x_calc is infinity? */ 2357c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P || 2367c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) 2377c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, 2387c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME)); 2397c657876SArnaldo Carvalho de Melo else 2407c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; 2417c657876SArnaldo Carvalho de Melo 2427c657876SArnaldo Carvalho de Melo /* Update sending rate */ 2437c657876SArnaldo Carvalho de Melo ccid3_hc_tx_update_x(sk); 2447c657876SArnaldo Carvalho de Melo } 2456b5e633aSArnaldo Carvalho de Melo /* 2466b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2476b5e633aSArnaldo Carvalho de Melo * max(4 * R, 2 * s / X) 2486b5e633aSArnaldo Carvalho de Melo */ 249c68e64cfSArnaldo Carvalho de Melo next_tmout = max_t(u32, hctx->ccid3hctx_t_rto, 2506b5e633aSArnaldo Carvalho de Melo 2 * usecs_div(hctx->ccid3hctx_s, 2516b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x)); 2527c657876SArnaldo Carvalho de Melo break; 2537c657876SArnaldo Carvalho de Melo default: 2547c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 2557c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); 2567c657876SArnaldo Carvalho de Melo dump_stack(); 2577c657876SArnaldo Carvalho de Melo goto out; 2587c657876SArnaldo Carvalho de Melo } 2597c657876SArnaldo Carvalho de Melo 2607c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2617c657876SArnaldo Carvalho de Melo jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); 2627c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 2637c657876SArnaldo Carvalho de Melo out: 2647c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2657c657876SArnaldo Carvalho de Melo sock_put(sk); 2667c657876SArnaldo Carvalho de Melo } 2677c657876SArnaldo Carvalho de Melo 26827258ee5SArnaldo Carvalho de Melo static int ccid3_hc_tx_send_packet(struct sock *sk, 26927258ee5SArnaldo Carvalho de Melo struct sk_buff *skb, int len) 2707c657876SArnaldo Carvalho de Melo { 2717c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 27259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2738c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *new_packet; 2747c657876SArnaldo Carvalho de Melo struct timeval now; 27527258ee5SArnaldo Carvalho de Melo long delay; 2767c657876SArnaldo Carvalho de Melo int rc = -ENOTCONN; 2777c657876SArnaldo Carvalho de Melo 27859d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM); 2791f2333aeSArnaldo Carvalho de Melo 28059d203f9SArnaldo Carvalho de Melo /* Check if pure ACK or Terminating*/ 2817c657876SArnaldo Carvalho de Melo /* 2821f2333aeSArnaldo Carvalho de Melo * XXX: We only call this function for DATA and DATAACK, on, these 2831f2333aeSArnaldo Carvalho de Melo * packets can have zero length, but why the comment about "pure ACK"? 2847c657876SArnaldo Carvalho de Melo */ 28559d203f9SArnaldo Carvalho de Melo if (unlikely(len == 0)) 2867c657876SArnaldo Carvalho de Melo goto out; 2877c657876SArnaldo Carvalho de Melo 2887c657876SArnaldo Carvalho de Melo /* See if last packet allocated was not sent */ 2898c60f3faSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 2908c60f3faSArnaldo Carvalho de Melo if (new_packet == NULL || new_packet->dccphtx_sent) { 2911f2333aeSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, 2921f2333aeSArnaldo Carvalho de Melo SLAB_ATOMIC); 2937c657876SArnaldo Carvalho de Melo 2947c657876SArnaldo Carvalho de Melo rc = -ENOBUFS; 29559d203f9SArnaldo Carvalho de Melo if (unlikely(new_packet == NULL)) { 29659d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, not enough " 29759d203f9SArnaldo Carvalho de Melo "mem to add to history, send refused\n", 29859d203f9SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 2997c657876SArnaldo Carvalho de Melo goto out; 3007c657876SArnaldo Carvalho de Melo } 3017c657876SArnaldo Carvalho de Melo 3028c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); 3037c657876SArnaldo Carvalho de Melo } 3047c657876SArnaldo Carvalho de Melo 305b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3067c657876SArnaldo Carvalho de Melo 3077c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3087c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3091f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3101f2333aeSArnaldo Carvalho de Melo jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); 3117c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3127c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3137c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 314d7e0fb98SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi = TFRC_INITIAL_IPI; 3157c657876SArnaldo Carvalho de Melo 3167c657876SArnaldo Carvalho de Melo /* Set nominal send time for initial packet */ 3177c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 318b6ee3d4aSArnaldo Carvalho de Melo timeval_add_usecs(&hctx->ccid3hctx_t_nom, 319b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 3207c657876SArnaldo Carvalho de Melo ccid3_calc_new_delta(hctx); 3217c657876SArnaldo Carvalho de Melo rc = 0; 3227c657876SArnaldo Carvalho de Melo break; 3237c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3247c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 325b6ee3d4aSArnaldo Carvalho de Melo delay = (timeval_delta(&now, &hctx->ccid3hctx_t_nom) - 326b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_delta); 32727258ee5SArnaldo Carvalho de Melo delay /= -1000; 3287c657876SArnaldo Carvalho de Melo /* divide by -1000 is to convert to ms and get sign right */ 329d6809c12SArnaldo Carvalho de Melo rc = delay > 0 ? delay : 0; 3307c657876SArnaldo Carvalho de Melo break; 3317c657876SArnaldo Carvalho de Melo default: 3327c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 3337c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); 3347c657876SArnaldo Carvalho de Melo dump_stack(); 3357c657876SArnaldo Carvalho de Melo rc = -EINVAL; 3367c657876SArnaldo Carvalho de Melo break; 3377c657876SArnaldo Carvalho de Melo } 3387c657876SArnaldo Carvalho de Melo 3397c657876SArnaldo Carvalho de Melo /* Can we send? if so add options and add to packet history */ 340507d37cfSArnaldo Carvalho de Melo if (rc == 0) { 341507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 342c1734376SArnaldo Carvalho de Melo new_packet->dccphtx_ccval = 3438c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = 3448c60f3faSArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count; 345507d37cfSArnaldo Carvalho de Melo } 3467c657876SArnaldo Carvalho de Melo out: 3477c657876SArnaldo Carvalho de Melo return rc; 3487c657876SArnaldo Carvalho de Melo } 3497c657876SArnaldo Carvalho de Melo 3507c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len) 3517c657876SArnaldo Carvalho de Melo { 35259725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 35359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3547c657876SArnaldo Carvalho de Melo struct timeval now; 3557c657876SArnaldo Carvalho de Melo 35659d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM); 3577c657876SArnaldo Carvalho de Melo 358b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3597c657876SArnaldo Carvalho de Melo 3607c657876SArnaldo Carvalho de Melo /* check if we have sent a data packet */ 3617c657876SArnaldo Carvalho de Melo if (len > 0) { 3627c657876SArnaldo Carvalho de Melo unsigned long quarter_rtt; 3638c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 3647c657876SArnaldo Carvalho de Melo 3658c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 36659d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 36759d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: packet doesn't " 36859d203f9SArnaldo Carvalho de Melo "exists in history!\n", __FUNCTION__); 3697c657876SArnaldo Carvalho de Melo return; 3707c657876SArnaldo Carvalho de Melo } 37159d203f9SArnaldo Carvalho de Melo if (unlikely(packet->dccphtx_sent)) { 37259d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: no unsent packet in " 37359d203f9SArnaldo Carvalho de Melo "history!\n", __FUNCTION__); 3747c657876SArnaldo Carvalho de Melo return; 3757c657876SArnaldo Carvalho de Melo } 3768c60f3faSArnaldo Carvalho de Melo packet->dccphtx_tstamp = now; 3778c60f3faSArnaldo Carvalho de Melo packet->dccphtx_seqno = dp->dccps_gss; 3787c657876SArnaldo Carvalho de Melo /* 3791f2333aeSArnaldo Carvalho de Melo * Check if win_count have changed 3801f2333aeSArnaldo Carvalho de Melo * Algorithm in "8.1. Window Counter Valuer" in 3811f2333aeSArnaldo Carvalho de Melo * draft-ietf-dccp-ccid3-11.txt 3827c657876SArnaldo Carvalho de Melo */ 3836b5e633aSArnaldo Carvalho de Melo quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); 3846b5e633aSArnaldo Carvalho de Melo if (likely(hctx->ccid3hctx_rtt > 8)) 3856b5e633aSArnaldo Carvalho de Melo quarter_rtt /= hctx->ccid3hctx_rtt / 4; 3866b5e633aSArnaldo Carvalho de Melo 3877c657876SArnaldo Carvalho de Melo if (quarter_rtt > 0) { 3887c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3897c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + 3907c657876SArnaldo Carvalho de Melo min_t(unsigned long, quarter_rtt, 5)) % 16; 3911f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, window changed from " 3921f2333aeSArnaldo Carvalho de Melo "%u to %u!\n", 3937c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 394c1734376SArnaldo Carvalho de Melo packet->dccphtx_ccval, 3957c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count); 3967c657876SArnaldo Carvalho de Melo } 3971f2333aeSArnaldo Carvalho de Melo 3987c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 0; 399c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 4008c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 4017c657876SArnaldo Carvalho de Melo } else 4027c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", 4037c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, dp->dccps_gss); 4047c657876SArnaldo Carvalho de Melo 4057c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4067c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 4077c657876SArnaldo Carvalho de Melo /* if first wasn't pure ack */ 4087c657876SArnaldo Carvalho de Melo if (len != 0) 4091f2333aeSArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, First packet sent is noted " 4101f2333aeSArnaldo Carvalho de Melo "as a data packet\n", 4117c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk)); 4127c657876SArnaldo Carvalho de Melo return; 4137c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4147c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4157c657876SArnaldo Carvalho de Melo if (len > 0) { 4167c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 4177c657876SArnaldo Carvalho de Melo ccid3_calc_new_t_ipi(hctx); 4187c657876SArnaldo Carvalho de Melo ccid3_calc_new_delta(hctx); 419b6ee3d4aSArnaldo Carvalho de Melo timeval_add_usecs(&hctx->ccid3hctx_t_nom, 420b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 4217c657876SArnaldo Carvalho de Melo } 4227c657876SArnaldo Carvalho de Melo break; 4237c657876SArnaldo Carvalho de Melo default: 4247c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 4257c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); 4267c657876SArnaldo Carvalho de Melo dump_stack(); 4277c657876SArnaldo Carvalho de Melo break; 4287c657876SArnaldo Carvalho de Melo } 4297c657876SArnaldo Carvalho de Melo } 4307c657876SArnaldo Carvalho de Melo 4317c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 4327c657876SArnaldo Carvalho de Melo { 43359725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 43459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 4357c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4368c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 437b0e56780SArnaldo Carvalho de Melo struct timeval now; 4387c657876SArnaldo Carvalho de Melo unsigned long next_tmout; 4391bc09869SIan McDonald u32 t_elapsed; 4407c657876SArnaldo Carvalho de Melo u32 pinv; 4417c657876SArnaldo Carvalho de Melo u32 x_recv; 4427c657876SArnaldo Carvalho de Melo u32 r_sample; 4431f2333aeSArnaldo Carvalho de Melo 44459d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM); 4457c657876SArnaldo Carvalho de Melo 4467c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4477c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4487c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4497c657876SArnaldo Carvalho de Melo return; 4507c657876SArnaldo Carvalho de Melo 4517c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4527c657876SArnaldo Carvalho de Melo 4531a28599aSArnaldo Carvalho de Melo t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; 4547c657876SArnaldo Carvalho de Melo x_recv = opt_recv->ccid3or_receive_rate; 4557c657876SArnaldo Carvalho de Melo pinv = opt_recv->ccid3or_loss_event_rate; 4567c657876SArnaldo Carvalho de Melo 4577c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4587c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 4597c657876SArnaldo Carvalho de Melo /* FIXME: what to do here? */ 4607c657876SArnaldo Carvalho de Melo return; 4617c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4627c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4637c657876SArnaldo Carvalho de Melo /* Calculate new round trip sample by 4647c657876SArnaldo Carvalho de Melo * R_sample = (now - t_recvdata) - t_delay */ 4657c657876SArnaldo Carvalho de Melo /* get t_recvdata from history */ 4668c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4678c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 46859d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 46959d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, seqno " 47059d203f9SArnaldo Carvalho de Melo "%llu(%s) does't exist in history!\n", 47159d203f9SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, 47259d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4737c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4747c657876SArnaldo Carvalho de Melo return; 4757c657876SArnaldo Carvalho de Melo } 4767c657876SArnaldo Carvalho de Melo 4777c657876SArnaldo Carvalho de Melo /* Update RTT */ 478b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 479b0e56780SArnaldo Carvalho de Melo r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); 4801a28599aSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 48159d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, " 48259d203f9SArnaldo Carvalho de Melo "t_elapsed=%uus\n", 4831a28599aSArnaldo Carvalho de Melo __FUNCTION__, r_sample, t_elapsed); 4841a28599aSArnaldo Carvalho de Melo else 4851a28599aSArnaldo Carvalho de Melo r_sample -= t_elapsed; 4867c657876SArnaldo Carvalho de Melo 4877c657876SArnaldo Carvalho de Melo /* Update RTT estimate by 4887c657876SArnaldo Carvalho de Melo * If (No feedback recv) 4897c657876SArnaldo Carvalho de Melo * R = R_sample; 4907c657876SArnaldo Carvalho de Melo * Else 4917c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 4927c657876SArnaldo Carvalho de Melo * 4937c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 4947c657876SArnaldo Carvalho de Melo */ 4957c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 4967c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 4977c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 4987c657876SArnaldo Carvalho de Melo } else 4991f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + 5001f2333aeSArnaldo Carvalho de Melo r_sample / 10; 5017c657876SArnaldo Carvalho de Melo 5021f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " 5031f2333aeSArnaldo Carvalho de Melo "r_sample=%us\n", dccp_role(sk), sk, 5041f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, r_sample); 5057c657876SArnaldo Carvalho de Melo 5067c657876SArnaldo Carvalho de Melo /* Update timeout interval */ 507c68e64cfSArnaldo Carvalho de Melo hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 508cef07fd6SArnaldo Carvalho de Melo USEC_PER_SEC); 5097c657876SArnaldo Carvalho de Melo 5107c657876SArnaldo Carvalho de Melo /* Update receive rate */ 5111f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ 5127c657876SArnaldo Carvalho de Melo 5137c657876SArnaldo Carvalho de Melo /* Update loss event rate */ 5147c657876SArnaldo Carvalho de Melo if (pinv == ~0 || pinv == 0) 5157c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 0; 5167c657876SArnaldo Carvalho de Melo else { 5177c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 1000000 / pinv; 5187c657876SArnaldo Carvalho de Melo 5197c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { 5207c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = TFRC_SMALLEST_P; 5211f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", 5221f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk); 5237c657876SArnaldo Carvalho de Melo } 5247c657876SArnaldo Carvalho de Melo } 5257c657876SArnaldo Carvalho de Melo 5267c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 5277c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5287c657876SArnaldo Carvalho de Melo 5297c657876SArnaldo Carvalho de Melo /* Update sending rate */ 5307c657876SArnaldo Carvalho de Melo ccid3_hc_tx_update_x(sk); 5317c657876SArnaldo Carvalho de Melo 5327c657876SArnaldo Carvalho de Melo /* Update next send time */ 533b6ee3d4aSArnaldo Carvalho de Melo timeval_sub_usecs(&hctx->ccid3hctx_t_nom, 534b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 5357c657876SArnaldo Carvalho de Melo ccid3_calc_new_t_ipi(hctx); 536b6ee3d4aSArnaldo Carvalho de Melo timeval_add_usecs(&hctx->ccid3hctx_t_nom, 537b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 5387c657876SArnaldo Carvalho de Melo ccid3_calc_new_delta(hctx); 5397c657876SArnaldo Carvalho de Melo 5407c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5418c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5428c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 543c530cfb1SArnaldo Carvalho de Melo /* 544c530cfb1SArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible that 545c530cfb1SArnaldo Carvalho de Melo * we now can send a packet, so wake up dccp_wait_for_ccids. 546c530cfb1SArnaldo Carvalho de Melo */ 547c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5488c60f3faSArnaldo Carvalho de Melo 5491f2333aeSArnaldo Carvalho de Melo /* 5501f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5511f2333aeSArnaldo Carvalho de Melo * max(4 * R, 2 * s / X) 5521f2333aeSArnaldo Carvalho de Melo */ 553c68e64cfSArnaldo Carvalho de Melo next_tmout = max(hctx->ccid3hctx_t_rto, 5546b5e633aSArnaldo Carvalho de Melo 2 * usecs_div(hctx->ccid3hctx_s, 5556b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x)); 5567c657876SArnaldo Carvalho de Melo 5571f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " 5581f2333aeSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5591f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 5601f2333aeSArnaldo Carvalho de Melo usecs_to_jiffies(next_tmout), next_tmout); 5617c657876SArnaldo Carvalho de Melo 5627c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5637c657876SArnaldo Carvalho de Melo jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); 5647c657876SArnaldo Carvalho de Melo 5657c657876SArnaldo Carvalho de Melo /* set idle flag */ 5667c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5677c657876SArnaldo Carvalho de Melo break; 5687c657876SArnaldo Carvalho de Melo default: 5697c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 5707c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); 5717c657876SArnaldo Carvalho de Melo dump_stack(); 5727c657876SArnaldo Carvalho de Melo break; 5737c657876SArnaldo Carvalho de Melo } 5747c657876SArnaldo Carvalho de Melo } 5757c657876SArnaldo Carvalho de Melo 5762d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) 5777c657876SArnaldo Carvalho de Melo { 57859d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5797c657876SArnaldo Carvalho de Melo 58059d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 58159d203f9SArnaldo Carvalho de Melo 5822d0817d1SArnaldo Carvalho de Melo if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) 5837c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 5842d0817d1SArnaldo Carvalho de Melo return 0; 5857c657876SArnaldo Carvalho de Melo } 5867c657876SArnaldo Carvalho de Melo 5877c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5881f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5891f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5907c657876SArnaldo Carvalho de Melo { 5917c657876SArnaldo Carvalho de Melo int rc = 0; 59259725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 59359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5947c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 5957c657876SArnaldo Carvalho de Melo 59659d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 5977c657876SArnaldo Carvalho de Melo 5987c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5997c657876SArnaldo Carvalho de Melo 6007c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 6017c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 6027c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 6037c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 6047c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 6057c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 6067c657876SArnaldo Carvalho de Melo } 6077c657876SArnaldo Carvalho de Melo 6087c657876SArnaldo Carvalho de Melo switch (option) { 6097c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 61059d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 61159d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid " 61259d203f9SArnaldo Carvalho de Melo "len for TFRC_OPT_LOSS_EVENT_RATE\n", 61359d203f9SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 6147c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6157c657876SArnaldo Carvalho de Melo } else { 61660fe62e7SAndrea Bittau opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); 6177c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", 6187c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6197c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 6207c657876SArnaldo Carvalho de Melo } 6217c657876SArnaldo Carvalho de Melo break; 6227c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 6237c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 6247c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 6257c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", 6267c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6277c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 6287c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 6297c657876SArnaldo Carvalho de Melo break; 6307c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 63159d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 63259d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid " 63359d203f9SArnaldo Carvalho de Melo "len for TFRC_OPT_RECEIVE_RATE\n", 63459d203f9SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 6357c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6367c657876SArnaldo Carvalho de Melo } else { 63760fe62e7SAndrea Bittau opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); 6387c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", 6397c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6407c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 6417c657876SArnaldo Carvalho de Melo } 6427c657876SArnaldo Carvalho de Melo break; 6437c657876SArnaldo Carvalho de Melo } 6447c657876SArnaldo Carvalho de Melo 6457c657876SArnaldo Carvalho de Melo return rc; 6467c657876SArnaldo Carvalho de Melo } 6477c657876SArnaldo Carvalho de Melo 64891f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 6497c657876SArnaldo Carvalho de Melo { 6507c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 65191f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 6527c657876SArnaldo Carvalho de Melo 653a84ffe43SArnaldo Carvalho de Melo if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && 654a84ffe43SArnaldo Carvalho de Melo dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) 655a84ffe43SArnaldo Carvalho de Melo hctx->ccid3hctx_s = dp->dccps_packet_size; 6567c657876SArnaldo Carvalho de Melo else 6577c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE; 6587c657876SArnaldo Carvalho de Melo 6591f2333aeSArnaldo Carvalho de Melo /* Set transmission rate to 1 packet per second */ 6601f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = hctx->ccid3hctx_s; 661c68e64cfSArnaldo Carvalho de Melo hctx->ccid3hctx_t_rto = USEC_PER_SEC; 6627c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6637c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 664aa5d7df3SArnaldo Carvalho de Melo 665aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; 666aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 6677c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6687c657876SArnaldo Carvalho de Melo 6697c657876SArnaldo Carvalho de Melo return 0; 6707c657876SArnaldo Carvalho de Melo } 6717c657876SArnaldo Carvalho de Melo 6727c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6737c657876SArnaldo Carvalho de Melo { 67459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6757c657876SArnaldo Carvalho de Melo 6767c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 6777c657876SArnaldo Carvalho de Melo 6787c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6797c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6807c657876SArnaldo Carvalho de Melo 6817c657876SArnaldo Carvalho de Melo /* Empty packet history */ 6828c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 6837c657876SArnaldo Carvalho de Melo } 6847c657876SArnaldo Carvalho de Melo 6857c657876SArnaldo Carvalho de Melo /* 6867c657876SArnaldo Carvalho de Melo * RX Half Connection methods 6877c657876SArnaldo Carvalho de Melo */ 6887c657876SArnaldo Carvalho de Melo 6897c657876SArnaldo Carvalho de Melo /* TFRC receiver states */ 6907c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states { 6917c657876SArnaldo Carvalho de Melo TFRC_RSTATE_NO_DATA = 1, 6927c657876SArnaldo Carvalho de Melo TFRC_RSTATE_DATA, 6937c657876SArnaldo Carvalho de Melo TFRC_RSTATE_TERM = 127, 6947c657876SArnaldo Carvalho de Melo }; 6957c657876SArnaldo Carvalho de Melo 6967c657876SArnaldo Carvalho de Melo #ifdef CCID3_DEBUG 6977c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6987c657876SArnaldo Carvalho de Melo { 6997c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 7007c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 7017c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 7027c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 7037c657876SArnaldo Carvalho de Melo }; 7047c657876SArnaldo Carvalho de Melo 7057c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 7067c657876SArnaldo Carvalho de Melo } 7077c657876SArnaldo Carvalho de Melo #endif 7087c657876SArnaldo Carvalho de Melo 709c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 7101f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 7117c657876SArnaldo Carvalho de Melo { 71259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7137c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 7147c657876SArnaldo Carvalho de Melo 7157c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 7161f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 7171f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 7187c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 7197c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 7207c657876SArnaldo Carvalho de Melo } 7217c657876SArnaldo Carvalho de Melo 7227c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 7237c657876SArnaldo Carvalho de Melo { 72459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7257c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 7268c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 727b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 7287c657876SArnaldo Carvalho de Melo 7297c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 7307c657876SArnaldo Carvalho de Melo 731b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 732b6ee3d4aSArnaldo Carvalho de Melo 7337c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 7347c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 7357c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 7367c657876SArnaldo Carvalho de Melo break; 7377c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: { 738b6ee3d4aSArnaldo Carvalho de Melo const u32 delta = timeval_delta(&now, 739b6ee3d4aSArnaldo Carvalho de Melo &hcrx->ccid3hcrx_tstamp_last_feedback); 74027ae543eSArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, 74127ae543eSArnaldo Carvalho de Melo delta); 7427c657876SArnaldo Carvalho de Melo } 7437c657876SArnaldo Carvalho de Melo break; 7447c657876SArnaldo Carvalho de Melo default: 7457c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 7467c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state); 7477c657876SArnaldo Carvalho de Melo dump_stack(); 7487c657876SArnaldo Carvalho de Melo return; 7497c657876SArnaldo Carvalho de Melo } 7507c657876SArnaldo Carvalho de Melo 7518c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 75259d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 75359d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, no data packet " 75459d203f9SArnaldo Carvalho de Melo "in history!\n", 7557c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 7567c657876SArnaldo Carvalho de Melo return; 7577c657876SArnaldo Carvalho de Melo } 7587c657876SArnaldo Carvalho de Melo 759b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 760c1734376SArnaldo Carvalho de Melo hcrx->ccid3hcrx_last_counter = packet->dccphrx_ccval; 7618c60f3faSArnaldo Carvalho de Melo hcrx->ccid3hcrx_seqno_last_counter = packet->dccphrx_seqno; 7627c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7637c657876SArnaldo Carvalho de Melo 7647c657876SArnaldo Carvalho de Melo /* Convert to multiples of 10us */ 765b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time = 766b6ee3d4aSArnaldo Carvalho de Melo timeval_delta(&now, &packet->dccphrx_tstamp) / 10; 7677c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 7687c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = ~0; 7697c657876SArnaldo Carvalho de Melo else 7707c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 771507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7727c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7737c657876SArnaldo Carvalho de Melo } 7747c657876SArnaldo Carvalho de Melo 7752d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7767c657876SArnaldo Carvalho de Melo { 77759d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 77860fe62e7SAndrea Bittau __be32 x_recv, pinv; 7797c657876SArnaldo Carvalho de Melo 78059d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 78159d203f9SArnaldo Carvalho de Melo 78259d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7832d0817d1SArnaldo Carvalho de Melo return 0; 7847c657876SArnaldo Carvalho de Melo 7857c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_last_counter; 7864fded33bSArnaldo Carvalho de Melo 7874fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7882d0817d1SArnaldo Carvalho de Melo return 0; 7894fded33bSArnaldo Carvalho de Melo 7904fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7914fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7922d0817d1SArnaldo Carvalho de Melo 7932d0817d1SArnaldo Carvalho de Melo if ((hcrx->ccid3hcrx_elapsed_time != 0 && 7942d0817d1SArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 7952d0817d1SArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time)) || 7962d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb) || 7974fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7982d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7994fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 8002d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 8012d0817d1SArnaldo Carvalho de Melo return -1; 8022d0817d1SArnaldo Carvalho de Melo 8032d0817d1SArnaldo Carvalho de Melo return 0; 8047c657876SArnaldo Carvalho de Melo } 8057c657876SArnaldo Carvalho de Melo 8067c657876SArnaldo Carvalho de Melo /* calculate first loss interval 8077c657876SArnaldo Carvalho de Melo * 8087c657876SArnaldo Carvalho de Melo * returns estimated loss interval in usecs */ 8097c657876SArnaldo Carvalho de Melo 8107c657876SArnaldo Carvalho de Melo static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) 8117c657876SArnaldo Carvalho de Melo { 81259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 8138c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *entry, *next, *tail = NULL; 8147c657876SArnaldo Carvalho de Melo u32 rtt, delta, x_recv, fval, p, tmp2; 815b6ee3d4aSArnaldo Carvalho de Melo struct timeval tstamp = { 0, }; 8167c657876SArnaldo Carvalho de Melo int interval = 0; 8177c657876SArnaldo Carvalho de Melo int win_count = 0; 8187c657876SArnaldo Carvalho de Melo int step = 0; 8197c657876SArnaldo Carvalho de Melo u64 tmp1; 8207c657876SArnaldo Carvalho de Melo 8218c60f3faSArnaldo Carvalho de Melo list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, 8228c60f3faSArnaldo Carvalho de Melo dccphrx_node) { 8238c60f3faSArnaldo Carvalho de Melo if (dccp_rx_hist_entry_data_packet(entry)) { 8247c657876SArnaldo Carvalho de Melo tail = entry; 8257c657876SArnaldo Carvalho de Melo 8267c657876SArnaldo Carvalho de Melo switch (step) { 8277c657876SArnaldo Carvalho de Melo case 0: 8288c60f3faSArnaldo Carvalho de Melo tstamp = entry->dccphrx_tstamp; 829c1734376SArnaldo Carvalho de Melo win_count = entry->dccphrx_ccval; 8307c657876SArnaldo Carvalho de Melo step = 1; 8317c657876SArnaldo Carvalho de Melo break; 8327c657876SArnaldo Carvalho de Melo case 1: 833c1734376SArnaldo Carvalho de Melo interval = win_count - entry->dccphrx_ccval; 8347c657876SArnaldo Carvalho de Melo if (interval < 0) 8357c657876SArnaldo Carvalho de Melo interval += TFRC_WIN_COUNT_LIMIT; 8367c657876SArnaldo Carvalho de Melo if (interval > 4) 8377c657876SArnaldo Carvalho de Melo goto found; 8387c657876SArnaldo Carvalho de Melo break; 8397c657876SArnaldo Carvalho de Melo } 8407c657876SArnaldo Carvalho de Melo } 8417c657876SArnaldo Carvalho de Melo } 8427c657876SArnaldo Carvalho de Melo 84359d203f9SArnaldo Carvalho de Melo if (unlikely(step == 0)) { 84459d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, packet history " 84559d203f9SArnaldo Carvalho de Melo "contains no data packets!\n", 8467c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 8477c657876SArnaldo Carvalho de Melo return ~0; 8487c657876SArnaldo Carvalho de Melo } 8497c657876SArnaldo Carvalho de Melo 85059d203f9SArnaldo Carvalho de Melo if (unlikely(interval == 0)) { 85159d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Could not find a " 85259d203f9SArnaldo Carvalho de Melo "win_count interval > 0. Defaulting to 1\n", 85359d203f9SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 8547c657876SArnaldo Carvalho de Melo interval = 1; 8557c657876SArnaldo Carvalho de Melo } 8567c657876SArnaldo Carvalho de Melo found: 857b6ee3d4aSArnaldo Carvalho de Melo rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; 8587c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", 8597c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, rtt); 8607c657876SArnaldo Carvalho de Melo if (rtt == 0) 8617c657876SArnaldo Carvalho de Melo rtt = 1; 8627c657876SArnaldo Carvalho de Melo 863b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &tstamp); 864b0e56780SArnaldo Carvalho de Melo delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); 865b0e56780SArnaldo Carvalho de Melo x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); 8667c657876SArnaldo Carvalho de Melo 8677c657876SArnaldo Carvalho de Melo tmp1 = (u64)x_recv * (u64)rtt; 8687c657876SArnaldo Carvalho de Melo do_div(tmp1,10000000); 8697c657876SArnaldo Carvalho de Melo tmp2 = (u32)tmp1; 8707c657876SArnaldo Carvalho de Melo fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; 8717c657876SArnaldo Carvalho de Melo /* do not alter order above or you will get overflow on 32 bit */ 87236729c1aSArnaldo Carvalho de Melo p = tfrc_calc_x_reverse_lookup(fval); 8731f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " 8741f2333aeSArnaldo Carvalho de Melo "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 8757c657876SArnaldo Carvalho de Melo 8767c657876SArnaldo Carvalho de Melo if (p == 0) 8777c657876SArnaldo Carvalho de Melo return ~0; 8787c657876SArnaldo Carvalho de Melo else 8797c657876SArnaldo Carvalho de Melo return 1000000 / p; 8807c657876SArnaldo Carvalho de Melo } 8817c657876SArnaldo Carvalho de Melo 8827c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) 8837c657876SArnaldo Carvalho de Melo { 88459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 8857c657876SArnaldo Carvalho de Melo 886ae6706f0SArnaldo Carvalho de Melo if (seq_loss != DCCP_MAX_SEQNO + 1 && 887ae6706f0SArnaldo Carvalho de Melo list_empty(&hcrx->ccid3hcrx_li_hist)) { 888ae6706f0SArnaldo Carvalho de Melo struct dccp_li_hist_entry *li_tail; 8897c657876SArnaldo Carvalho de Melo 890ae6706f0SArnaldo Carvalho de Melo li_tail = dccp_li_hist_interval_new(ccid3_li_hist, 891ae6706f0SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, 892ae6706f0SArnaldo Carvalho de Melo seq_loss, win_loss); 8937c657876SArnaldo Carvalho de Melo if (li_tail == NULL) 894ae6706f0SArnaldo Carvalho de Melo return; 895ae6706f0SArnaldo Carvalho de Melo li_tail->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); 89659d203f9SArnaldo Carvalho de Melo } else 89759d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: FIXME: find end of " 89859d203f9SArnaldo Carvalho de Melo "interval\n", __FUNCTION__); 8997c657876SArnaldo Carvalho de Melo } 9007c657876SArnaldo Carvalho de Melo 9017c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_detect_loss(struct sock *sk) 9027c657876SArnaldo Carvalho de Melo { 90359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 90429e4f8b3SArnaldo Carvalho de Melo u8 win_loss; 90529e4f8b3SArnaldo Carvalho de Melo const u64 seq_loss = dccp_rx_hist_detect_loss(&hcrx->ccid3hcrx_hist, 90629e4f8b3SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, 90729e4f8b3SArnaldo Carvalho de Melo &win_loss); 9087c657876SArnaldo Carvalho de Melo 9097c657876SArnaldo Carvalho de Melo ccid3_hc_rx_update_li(sk, seq_loss, win_loss); 9107c657876SArnaldo Carvalho de Melo } 9117c657876SArnaldo Carvalho de Melo 9127c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 9137c657876SArnaldo Carvalho de Melo { 91459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9154fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 9168c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 9177c657876SArnaldo Carvalho de Melo struct timeval now; 9187c657876SArnaldo Carvalho de Melo u8 win_count; 919b3a3077dSArnaldo Carvalho de Melo u32 p_prev, r_sample, t_elapsed; 9207c657876SArnaldo Carvalho de Melo int ins; 9211f2333aeSArnaldo Carvalho de Melo 92259d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL || 92359d203f9SArnaldo Carvalho de Melo !(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA || 9247c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA)); 9257c657876SArnaldo Carvalho de Melo 92659725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 9274fded33bSArnaldo Carvalho de Melo 9287c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 9297c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 9307c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 9317c657876SArnaldo Carvalho de Melo return; 9327c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 9334fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 9347c657876SArnaldo Carvalho de Melo break; 9357c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_rtt; 936b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 937b3a3077dSArnaldo Carvalho de Melo timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); 938b3a3077dSArnaldo Carvalho de Melo r_sample = timeval_usecs(&now); 939b3a3077dSArnaldo Carvalho de Melo t_elapsed = opt_recv->dccpor_elapsed_time * 10; 940b3a3077dSArnaldo Carvalho de Melo 941b3a3077dSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 94259d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, " 94359d203f9SArnaldo Carvalho de Melo "t_elapsed=%uus\n", 944b3a3077dSArnaldo Carvalho de Melo __FUNCTION__, r_sample, t_elapsed); 945b3a3077dSArnaldo Carvalho de Melo else 946b3a3077dSArnaldo Carvalho de Melo r_sample -= t_elapsed; 947b3a3077dSArnaldo Carvalho de Melo 948b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 949b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 950b3a3077dSArnaldo Carvalho de Melo else 951b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 952b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 953b3a3077dSArnaldo Carvalho de Melo 9547c657876SArnaldo Carvalho de Melo if (p_prev != hcrx->ccid3hcrx_rtt) 9554fded33bSArnaldo Carvalho de Melo ccid3_pr_debug("%s, New RTT=%luus, elapsed time=%u\n", 9564fded33bSArnaldo Carvalho de Melo dccp_role(sk), hcrx->ccid3hcrx_rtt, 9574fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 9587c657876SArnaldo Carvalho de Melo break; 9597c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 9607c657876SArnaldo Carvalho de Melo break; 96159d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 9627c657876SArnaldo Carvalho de Melo return; 9637c657876SArnaldo Carvalho de Melo } 9647c657876SArnaldo Carvalho de Melo 965b0e56780SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, 9668c60f3faSArnaldo Carvalho de Melo skb, SLAB_ATOMIC); 96759d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 96859d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Not enough mem to " 96959d203f9SArnaldo Carvalho de Melo "add rx packet to history, consider it lost!\n", 97059d203f9SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 9717c657876SArnaldo Carvalho de Melo return; 9727c657876SArnaldo Carvalho de Melo } 9737c657876SArnaldo Carvalho de Melo 974c1734376SArnaldo Carvalho de Melo win_count = packet->dccphrx_ccval; 9757c657876SArnaldo Carvalho de Melo 976072ab6c6SArnaldo Carvalho de Melo ins = dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 977072ab6c6SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, packet); 9787c657876SArnaldo Carvalho de Melo 9797c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 9807c657876SArnaldo Carvalho de Melo return; 9817c657876SArnaldo Carvalho de Melo 9827c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 9837c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 9841f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " 9851f2333aeSArnaldo Carvalho de Melo "feedback\n", 9861f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 9871f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 9887c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 9897c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 9907c657876SArnaldo Carvalho de Melo return; 9917c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 9921f2333aeSArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv += skb->len - 9931f2333aeSArnaldo Carvalho de Melo dccp_hdr(skb)->dccph_doff * 4; 994b6ee3d4aSArnaldo Carvalho de Melo if (ins != 0) 995b6ee3d4aSArnaldo Carvalho de Melo break; 996b6ee3d4aSArnaldo Carvalho de Melo 997b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 998b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= 9994fded33bSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt) { 1000b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 10017c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10027c657876SArnaldo Carvalho de Melo } 10037c657876SArnaldo Carvalho de Melo return; 10047c657876SArnaldo Carvalho de Melo default: 10057c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 10067c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state); 10077c657876SArnaldo Carvalho de Melo dump_stack(); 10087c657876SArnaldo Carvalho de Melo return; 10097c657876SArnaldo Carvalho de Melo } 10107c657876SArnaldo Carvalho de Melo 10117c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 10124fded33bSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", 10134fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 10147c657876SArnaldo Carvalho de Melo 10157c657876SArnaldo Carvalho de Melo ccid3_hc_rx_detect_loss(sk); 10167c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 10177c657876SArnaldo Carvalho de Melo 10187c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 1019c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 1020c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 1021c0996660SIan McDonald 10227c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 1023c0996660SIan McDonald if (i_mean != 0) 1024c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 1025c0996660SIan McDonald } 10267c657876SArnaldo Carvalho de Melo 10277c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 10287c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10297c657876SArnaldo Carvalho de Melo return; 10307c657876SArnaldo Carvalho de Melo } 10317c657876SArnaldo Carvalho de Melo } 10327c657876SArnaldo Carvalho de Melo 103391f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 10347c657876SArnaldo Carvalho de Melo { 10357c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 103691f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 10377c657876SArnaldo Carvalho de Melo 10387c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 10397c657876SArnaldo Carvalho de Melo 1040a84ffe43SArnaldo Carvalho de Melo if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && 1041a84ffe43SArnaldo Carvalho de Melo dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) 1042a84ffe43SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = dp->dccps_packet_size; 10437c657876SArnaldo Carvalho de Melo else 10447c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE; 10457c657876SArnaldo Carvalho de Melo 10467c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 10477c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 1048ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 1049b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); 1050954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; 1051954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ 10527c657876SArnaldo Carvalho de Melo return 0; 10537c657876SArnaldo Carvalho de Melo } 10547c657876SArnaldo Carvalho de Melo 10557c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 10567c657876SArnaldo Carvalho de Melo { 105759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 10587c657876SArnaldo Carvalho de Melo 105959d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 10607c657876SArnaldo Carvalho de Melo 10617c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 10627c657876SArnaldo Carvalho de Melo 10637c657876SArnaldo Carvalho de Melo /* Empty packet history */ 10648c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 10657c657876SArnaldo Carvalho de Melo 10667c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 1067ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); 10687c657876SArnaldo Carvalho de Melo } 10697c657876SArnaldo Carvalho de Melo 10702babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 10712babe1f6SArnaldo Carvalho de Melo { 107259725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 10732babe1f6SArnaldo Carvalho de Melo 107459c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 107559c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 107659c2353dSArnaldo Carvalho de Melo return; 107759c2353dSArnaldo Carvalho de Melo 107859d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 10792babe1f6SArnaldo Carvalho de Melo 10802babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 10812babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 10822babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 10832babe1f6SArnaldo Carvalho de Melo } 10842babe1f6SArnaldo Carvalho de Melo 10852babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 10862babe1f6SArnaldo Carvalho de Melo { 108759725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 10882babe1f6SArnaldo Carvalho de Melo 108959c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 109059c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 109159c2353dSArnaldo Carvalho de Melo return; 109259c2353dSArnaldo Carvalho de Melo 109359d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 10942babe1f6SArnaldo Carvalho de Melo 10952babe1f6SArnaldo Carvalho de Melo info->tcpi_rto = hctx->ccid3hctx_t_rto; 10962babe1f6SArnaldo Carvalho de Melo info->tcpi_rtt = hctx->ccid3hctx_rtt; 10972babe1f6SArnaldo Carvalho de Melo } 10982babe1f6SArnaldo Carvalho de Melo 109988f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 110088f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 110188f964dbSArnaldo Carvalho de Melo { 110288f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 110388f964dbSArnaldo Carvalho de Melo const void *val; 110488f964dbSArnaldo Carvalho de Melo 110588f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 110688f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 110788f964dbSArnaldo Carvalho de Melo return -EINVAL; 110888f964dbSArnaldo Carvalho de Melo 110988f964dbSArnaldo Carvalho de Melo switch (optname) { 111088f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 111188f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 111288f964dbSArnaldo Carvalho de Melo return -EINVAL; 111388f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 111488f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 111588f964dbSArnaldo Carvalho de Melo break; 111688f964dbSArnaldo Carvalho de Melo default: 111788f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 111888f964dbSArnaldo Carvalho de Melo } 111988f964dbSArnaldo Carvalho de Melo 112088f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 112188f964dbSArnaldo Carvalho de Melo return -EFAULT; 112288f964dbSArnaldo Carvalho de Melo 112388f964dbSArnaldo Carvalho de Melo return 0; 112488f964dbSArnaldo Carvalho de Melo } 112588f964dbSArnaldo Carvalho de Melo 112688f964dbSArnaldo Carvalho de Melo static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 112788f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 112888f964dbSArnaldo Carvalho de Melo { 112988f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 113088f964dbSArnaldo Carvalho de Melo const void *val; 113188f964dbSArnaldo Carvalho de Melo 113288f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 113388f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 113488f964dbSArnaldo Carvalho de Melo return -EINVAL; 113588f964dbSArnaldo Carvalho de Melo 113688f964dbSArnaldo Carvalho de Melo switch (optname) { 113788f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_TX_INFO: 113888f964dbSArnaldo Carvalho de Melo if (len < sizeof(hctx->ccid3hctx_tfrc)) 113988f964dbSArnaldo Carvalho de Melo return -EINVAL; 114088f964dbSArnaldo Carvalho de Melo len = sizeof(hctx->ccid3hctx_tfrc); 114188f964dbSArnaldo Carvalho de Melo val = &hctx->ccid3hctx_tfrc; 114288f964dbSArnaldo Carvalho de Melo break; 114388f964dbSArnaldo Carvalho de Melo default: 114488f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 114588f964dbSArnaldo Carvalho de Melo } 114688f964dbSArnaldo Carvalho de Melo 114788f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 114888f964dbSArnaldo Carvalho de Melo return -EFAULT; 114988f964dbSArnaldo Carvalho de Melo 115088f964dbSArnaldo Carvalho de Melo return 0; 115188f964dbSArnaldo Carvalho de Melo } 115288f964dbSArnaldo Carvalho de Melo 115391f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 11547c657876SArnaldo Carvalho de Melo .ccid_id = 3, 11557c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 11567c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 115791f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 11587c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 11597c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 11607c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 11617c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 11627c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 11637c657876SArnaldo Carvalho de Melo .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, 11647c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 116591f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 11667c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 11677c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 11687c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 11697c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 11702babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 11712babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 117288f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 117388f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 11747c657876SArnaldo Carvalho de Melo }; 11757c657876SArnaldo Carvalho de Melo 11767c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 11777c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 11787c657876SArnaldo Carvalho de Melo 11797c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 11807c657876SArnaldo Carvalho de Melo { 11818c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 11827c657876SArnaldo Carvalho de Melo 11838c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 11848c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 11857c657876SArnaldo Carvalho de Melo goto out; 11867c657876SArnaldo Carvalho de Melo 11878c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 11888c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 11898c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 11907c657876SArnaldo Carvalho de Melo 1191ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = dccp_li_hist_new("ccid3"); 1192ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist == NULL) 11938c60f3faSArnaldo Carvalho de Melo goto out_free_tx; 11947c657876SArnaldo Carvalho de Melo 11957c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 11967c657876SArnaldo Carvalho de Melo if (rc != 0) 11977c657876SArnaldo Carvalho de Melo goto out_free_loss_interval_history; 11987c657876SArnaldo Carvalho de Melo out: 11997c657876SArnaldo Carvalho de Melo return rc; 12008c60f3faSArnaldo Carvalho de Melo 12017c657876SArnaldo Carvalho de Melo out_free_loss_interval_history: 1202ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1203ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12048c60f3faSArnaldo Carvalho de Melo out_free_tx: 12058c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12068c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12078c60f3faSArnaldo Carvalho de Melo out_free_rx: 12088c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12098c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12107c657876SArnaldo Carvalho de Melo goto out; 12117c657876SArnaldo Carvalho de Melo } 12127c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 12137c657876SArnaldo Carvalho de Melo 12147c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 12157c657876SArnaldo Carvalho de Melo { 12167c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 12177c657876SArnaldo Carvalho de Melo 12188c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 12198c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12208c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12217c657876SArnaldo Carvalho de Melo } 12228c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 12238c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12248c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12257c657876SArnaldo Carvalho de Melo } 1226ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist != NULL) { 1227ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1228ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12297c657876SArnaldo Carvalho de Melo } 12307c657876SArnaldo Carvalho de Melo } 12317c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 12327c657876SArnaldo Carvalho de Melo 1233e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 12341f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 12357c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 12367c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 12377c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1238