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 4456724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 4556724aa4SGerrit Renker static int ccid3_debug; 4656724aa4SGerrit Renker #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) 477c657876SArnaldo Carvalho de Melo #else 487c657876SArnaldo Carvalho de Melo #define ccid3_pr_debug(format, a...) 497c657876SArnaldo Carvalho de Melo #endif 507c657876SArnaldo Carvalho de Melo 51a1d3a355SArnaldo Carvalho de Melo static struct dccp_tx_hist *ccid3_tx_hist; 52a1d3a355SArnaldo Carvalho de Melo static struct dccp_rx_hist *ccid3_rx_hist; 53ae6706f0SArnaldo Carvalho de Melo static struct dccp_li_hist *ccid3_li_hist; 547c657876SArnaldo Carvalho de Melo 5556724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 567c657876SArnaldo Carvalho de Melo static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) 577c657876SArnaldo Carvalho de Melo { 587c657876SArnaldo Carvalho de Melo static char *ccid3_state_names[] = { 597c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_SENT] = "NO_SENT", 607c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", 617c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_FBACK] = "FBACK", 627c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_TERM] = "TERM", 637c657876SArnaldo Carvalho de Melo }; 647c657876SArnaldo Carvalho de Melo 657c657876SArnaldo Carvalho de Melo return ccid3_state_names[state]; 667c657876SArnaldo Carvalho de Melo } 677c657876SArnaldo Carvalho de Melo #endif 687c657876SArnaldo Carvalho de Melo 69c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_tx_set_state(struct sock *sk, 701f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_tx_states state) 717c657876SArnaldo Carvalho de Melo { 7259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 737c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; 747c657876SArnaldo Carvalho de Melo 757c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 761f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_tx_state_name(oldstate), 771f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(state)); 787c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 797c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = state; 807c657876SArnaldo Carvalho de Melo } 817c657876SArnaldo Carvalho de Melo 8217893bc1SGerrit Renker /* 8317893bc1SGerrit Renker * Recalculate scheduled nominal send time t_nom, inter-packet interval 8417893bc1SGerrit Renker * t_ipi, and delta value. Should be called after each change to X. 8517893bc1SGerrit Renker */ 8617893bc1SGerrit Renker static inline void ccid3_update_send_time(struct ccid3_hc_tx_sock *hctx) 877c657876SArnaldo Carvalho de Melo { 8817893bc1SGerrit Renker timeval_sub_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); 8917893bc1SGerrit Renker 901a21e49aSGerrit Renker /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */ 911a21e49aSGerrit Renker hctx->ccid3hctx_t_ipi = scaled_div(hctx->ccid3hctx_s, 921a21e49aSGerrit Renker hctx->ccid3hctx_x >> 6); 9317893bc1SGerrit Renker 9417893bc1SGerrit Renker /* Update nominal send time with regard to the new t_ipi */ 9517893bc1SGerrit Renker timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); 967c657876SArnaldo Carvalho de Melo 977c657876SArnaldo Carvalho de Melo /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ 981f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, 991f2333aeSArnaldo Carvalho de Melo TFRC_OPSYS_HALF_TIME_GRAN); 1007c657876SArnaldo Carvalho de Melo } 1017c657876SArnaldo Carvalho de Melo /* 1027c657876SArnaldo Carvalho de Melo * Update X by 1037c657876SArnaldo Carvalho de Melo * If (p > 0) 1045c3fbb6aSGerrit Renker * X_calc = calcX(s, R, p); 1057c657876SArnaldo Carvalho de Melo * X = max(min(X_calc, 2 * X_recv), s / t_mbi); 1067c657876SArnaldo Carvalho de Melo * Else 1077c657876SArnaldo Carvalho de Melo * If (now - tld >= R) 1087c657876SArnaldo Carvalho de Melo * X = max(min(2 * X, 2 * X_recv), s / R); 1097c657876SArnaldo Carvalho de Melo * tld = now; 1105c3fbb6aSGerrit Renker * 1111a21e49aSGerrit Renker * Note: X and X_recv are both stored in units of 64 * bytes/second, to support 1121a21e49aSGerrit Renker * fine-grained resolution of sending rates. This requires scaling by 2^6 1131a21e49aSGerrit Renker * throughout the code. Only X_calc is unscaled (in bytes/second). 1141a21e49aSGerrit Renker * 1155c3fbb6aSGerrit Renker * If X has changed, we also update the scheduled send time t_now, 1165c3fbb6aSGerrit Renker * the inter-packet interval t_ipi, and the delta value. 1177c657876SArnaldo Carvalho de Melo */ 118a79ef76fSGerrit Renker static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now) 119a79ef76fSGerrit Renker 1207c657876SArnaldo Carvalho de Melo { 12159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1221a21e49aSGerrit Renker const __u64 old_x = hctx->ccid3hctx_x; 1237c657876SArnaldo Carvalho de Melo 12444158306SGerrit Renker if (hctx->ccid3hctx_p > 0) { 1251a21e49aSGerrit Renker 1261a21e49aSGerrit Renker hctx->ccid3hctx_x = min_t(u64, hctx->ccid3hctx_x_calc << 6, 1271a21e49aSGerrit Renker hctx->ccid3hctx_x_recv * 2 ); 1281a21e49aSGerrit Renker hctx->ccid3hctx_x = max_t(u64, hctx->ccid3hctx_x, 1291a21e49aSGerrit Renker (hctx->ccid3hctx_s << 6)/TFRC_T_MBI); 130b6ee3d4aSArnaldo Carvalho de Melo 131a79ef76fSGerrit Renker } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) >= 132b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt) { 1331a21e49aSGerrit Renker 1341a21e49aSGerrit Renker hctx->ccid3hctx_x = max(2 * min(hctx->ccid3hctx_x, 1351a21e49aSGerrit Renker hctx->ccid3hctx_x_recv), 1361a21e49aSGerrit Renker scaled_div(hctx->ccid3hctx_s << 6, 1376b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt )); 138a79ef76fSGerrit Renker hctx->ccid3hctx_t_ld = *now; 139ff586298SGerrit Renker } 140a79ef76fSGerrit Renker 14117893bc1SGerrit Renker if (hctx->ccid3hctx_x != old_x) 14217893bc1SGerrit Renker ccid3_update_send_time(hctx); 1437c657876SArnaldo Carvalho de Melo } 1447c657876SArnaldo Carvalho de Melo 14578ad713dSGerrit Renker /* 14678ad713dSGerrit Renker * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) 14778ad713dSGerrit Renker * @len: DCCP packet payload size in bytes 14878ad713dSGerrit Renker */ 14978ad713dSGerrit Renker static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) 15078ad713dSGerrit Renker { 15178ad713dSGerrit Renker if (unlikely(len == 0)) 15278ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 15378ad713dSGerrit Renker else 15478ad713dSGerrit Renker hctx->ccid3hctx_s = hctx->ccid3hctx_s == 0 ? len : 15578ad713dSGerrit Renker (9 * hctx->ccid3hctx_s + len) / 10; 15678ad713dSGerrit Renker /* 15778ad713dSGerrit Renker * Note: We could do a potential optimisation here - when `s' changes, 15878ad713dSGerrit Renker * recalculate sending rate and consequently t_ipi, t_delta, and 15978ad713dSGerrit Renker * t_now. This is however non-standard, and the benefits are not 16078ad713dSGerrit Renker * clear, so it is currently left out. 16178ad713dSGerrit Renker */ 16278ad713dSGerrit Renker } 16378ad713dSGerrit Renker 1647c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 1657c657876SArnaldo Carvalho de Melo { 1667c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 16759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1682a1fda6fSGerrit Renker unsigned long t_nfb = USEC_PER_SEC / 5; 1697c657876SArnaldo Carvalho de Melo 1707c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 1717c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 1727c657876SArnaldo Carvalho de Melo /* Try again later. */ 1737c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 17448e03eeeSGerrit Renker goto restart_timer; 1757c657876SArnaldo Carvalho de Melo } 1767c657876SArnaldo Carvalho de Melo 1777c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, 1787c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 1797c657876SArnaldo Carvalho de Melo 1807c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 1817c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 182a79ef76fSGerrit Renker /* RFC 3448, 4.4: Halve send rate directly */ 183179ebc9fSGerrit Renker hctx->ccid3hctx_x = max_t(u32, hctx->ccid3hctx_x / 2, 1841a21e49aSGerrit Renker (hctx->ccid3hctx_s << 6)/TFRC_T_MBI); 1857c657876SArnaldo Carvalho de Melo 1861a21e49aSGerrit Renker ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %u " 1871f2333aeSArnaldo Carvalho de Melo "bytes/s\n", 1881f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 1891f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 1901a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 19148e03eeeSGerrit Renker /* The value of R is still undefined and so we can not recompute 19248e03eeeSGerrit Renker * the timout value. Keep initial value as per [RFC 4342, 5]. */ 1932a1fda6fSGerrit Renker t_nfb = TFRC_INITIAL_TIMEOUT; 19417893bc1SGerrit Renker ccid3_update_send_time(hctx); 1957c657876SArnaldo Carvalho de Melo break; 1967c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 1971f2333aeSArnaldo Carvalho de Melo /* 1981f2333aeSArnaldo Carvalho de Melo * Check if IDLE since last timeout and recv rate is less than 1991a21e49aSGerrit Renker * 4 packets (in units of 64*bytes/sec) per RTT 2001f2333aeSArnaldo Carvalho de Melo */ 2011f2333aeSArnaldo Carvalho de Melo if (!hctx->ccid3hctx_idle || 2021a21e49aSGerrit Renker (hctx->ccid3hctx_x_recv >= 4 * 2031a21e49aSGerrit Renker scaled_div(hctx->ccid3hctx_s << 6, hctx->ccid3hctx_rtt))) { 204a79ef76fSGerrit Renker struct timeval now; 205a79ef76fSGerrit Renker 2061f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", 2071f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2087c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2097c657876SArnaldo Carvalho de Melo 210ff586298SGerrit Renker /* 211ff586298SGerrit Renker * Modify the cached value of X_recv [RFC 3448, 4.4] 212ff586298SGerrit Renker * 213ff586298SGerrit Renker * If (p == 0 || X_calc > 2 * X_recv) 2147c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2157c657876SArnaldo Carvalho de Melo * Else 2167c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2171a21e49aSGerrit Renker * 2181a21e49aSGerrit Renker * Note that X_recv is scaled by 2^6 while X_calc is not 2197c657876SArnaldo Carvalho de Melo */ 22044158306SGerrit Renker BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); 2217c657876SArnaldo Carvalho de Melo 22244158306SGerrit Renker if (hctx->ccid3hctx_p == 0 || 2231a21e49aSGerrit Renker hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5)) { 2241a21e49aSGerrit Renker 2251a21e49aSGerrit Renker hctx->ccid3hctx_x_recv = 2261a21e49aSGerrit Renker max_t(u64, hctx->ccid3hctx_x_recv / 2, 2271a21e49aSGerrit Renker (hctx->ccid3hctx_s << 6) / 2281a21e49aSGerrit Renker (2*TFRC_T_MBI)); 2291a21e49aSGerrit Renker 230ff586298SGerrit Renker if (hctx->ccid3hctx_p == 0) 231ff586298SGerrit Renker dccp_timestamp(sk, &now); 232ff586298SGerrit Renker } else 2331a21e49aSGerrit Renker hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc << 4; 2347c657876SArnaldo Carvalho de Melo 235ff586298SGerrit Renker /* Now recalculate X [RFC 3448, 4.3, step (4)] */ 236a79ef76fSGerrit Renker ccid3_hc_tx_update_x(sk, &now); 2377c657876SArnaldo Carvalho de Melo } 2386b5e633aSArnaldo Carvalho de Melo /* 2396b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2408a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 2418a508ac2SGerrit Renker * See comments in packet_recv() regarding the value of t_RTO. 2426b5e633aSArnaldo Carvalho de Melo */ 2438a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 2447c657876SArnaldo Carvalho de Melo break; 24559348b19SGerrit Renker case TFRC_SSTATE_NO_SENT: 24659348b19SGerrit Renker DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); 24759348b19SGerrit Renker /* fall through */ 24859348b19SGerrit Renker case TFRC_SSTATE_TERM: 2497c657876SArnaldo Carvalho de Melo goto out; 2507c657876SArnaldo Carvalho de Melo } 2517c657876SArnaldo Carvalho de Melo 2527c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 25348e03eeeSGerrit Renker 25448e03eeeSGerrit Renker restart_timer: 25548e03eeeSGerrit Renker sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2562a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 2577c657876SArnaldo Carvalho de Melo out: 2587c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2597c657876SArnaldo Carvalho de Melo sock_put(sk); 2607c657876SArnaldo Carvalho de Melo } 2617c657876SArnaldo Carvalho de Melo 2627da7f456SGerrit Renker /* 2637da7f456SGerrit Renker * returns 2647da7f456SGerrit Renker * > 0: delay (in msecs) that should pass before actually sending 2657da7f456SGerrit Renker * = 0: can send immediately 2667da7f456SGerrit Renker * < 0: error condition; do not send packet 2677da7f456SGerrit Renker */ 2686b57c93dSGerrit Renker static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) 2697c657876SArnaldo Carvalho de Melo { 2707c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 27159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2728c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *new_packet; 2737c657876SArnaldo Carvalho de Melo struct timeval now; 27427258ee5SArnaldo Carvalho de Melo long delay; 2757c657876SArnaldo Carvalho de Melo 27659348b19SGerrit Renker BUG_ON(hctx == NULL); 2771f2333aeSArnaldo Carvalho de Melo 2787c657876SArnaldo Carvalho de Melo /* 279da335bafSGerrit Renker * This function is called only for Data and DataAck packets. Sending 280da335bafSGerrit Renker * zero-sized Data(Ack)s is theoretically possible, but for congestion 281da335bafSGerrit Renker * control this case is pathological - ignore it. 2827c657876SArnaldo Carvalho de Melo */ 2836b57c93dSGerrit Renker if (unlikely(skb->len == 0)) 284da335bafSGerrit Renker return -EBADMSG; 2857c657876SArnaldo Carvalho de Melo 2867c657876SArnaldo Carvalho de Melo /* See if last packet allocated was not sent */ 2878c60f3faSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 2888c60f3faSArnaldo Carvalho de Melo if (new_packet == NULL || new_packet->dccphtx_sent) { 2891f2333aeSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, 29054e6ecb2SChristoph Lameter GFP_ATOMIC); 2917c657876SArnaldo Carvalho de Melo 29259d203f9SArnaldo Carvalho de Melo if (unlikely(new_packet == NULL)) { 29359348b19SGerrit Renker DCCP_WARN("%s, sk=%p, not enough mem to add to history," 29459348b19SGerrit Renker "send refused\n", dccp_role(sk), sk); 2957da7f456SGerrit Renker return -ENOBUFS; 2967c657876SArnaldo Carvalho de Melo } 2977c657876SArnaldo Carvalho de Melo 2988c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); 2997c657876SArnaldo Carvalho de Melo } 3007c657876SArnaldo Carvalho de Melo 301b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3027c657876SArnaldo Carvalho de Melo 3037c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3047c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3051f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3061f2333aeSArnaldo Carvalho de Melo jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); 3077c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3087c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3097c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3107c657876SArnaldo Carvalho de Melo 3111a21e49aSGerrit Renker /* Set initial sending rate X/s to 1pps (X is scaled by 2^6) */ 3126b57c93dSGerrit Renker ccid3_hc_tx_update_s(hctx, skb->len); 3131a21e49aSGerrit Renker hctx->ccid3hctx_x = hctx->ccid3hctx_s << 6; 31478ad713dSGerrit Renker 31590feeb95SGerrit Renker /* First timeout, according to [RFC 3448, 4.2], is 1 second */ 31690feeb95SGerrit Renker hctx->ccid3hctx_t_ipi = USEC_PER_SEC; 31790feeb95SGerrit Renker /* Initial delta: minimum of 0.5 sec and t_gran/2 */ 31890feeb95SGerrit Renker hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; 31990feeb95SGerrit Renker 32090feeb95SGerrit Renker /* Set t_0 for initial packet */ 3217c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 3227c657876SArnaldo Carvalho de Melo break; 3237c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3247c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 32591cf5a17SGerrit Renker delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); 32691cf5a17SGerrit Renker /* 32791cf5a17SGerrit Renker * Scheduling of packet transmissions [RFC 3448, 4.6] 32891cf5a17SGerrit Renker * 32991cf5a17SGerrit Renker * if (t_now > t_nom - delta) 33091cf5a17SGerrit Renker * // send the packet now 33191cf5a17SGerrit Renker * else 33291cf5a17SGerrit Renker * // send the packet in (t_nom - t_now) milliseconds. 33391cf5a17SGerrit Renker */ 33476d12777SGerrit Renker if (delay - (long)hctx->ccid3hctx_delta >= 0) 3357da7f456SGerrit Renker return delay / 1000L; 3367c657876SArnaldo Carvalho de Melo break; 33759348b19SGerrit Renker case TFRC_SSTATE_TERM: 33859348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 3397da7f456SGerrit Renker return -EINVAL; 3407c657876SArnaldo Carvalho de Melo } 3417c657876SArnaldo Carvalho de Melo 3427da7f456SGerrit Renker /* prepare to send now (add options etc.) */ 343507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 3447da7f456SGerrit Renker new_packet->dccphtx_ccval = DCCP_SKB_CB(skb)->dccpd_ccval = 3458c60f3faSArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count; 3467da7f456SGerrit Renker timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); 3477da7f456SGerrit Renker 3487da7f456SGerrit Renker return 0; 3497c657876SArnaldo Carvalho de Melo } 3507c657876SArnaldo Carvalho de Melo 3516b57c93dSGerrit Renker static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len) 3527c657876SArnaldo Carvalho de Melo { 35359725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 35459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3557c657876SArnaldo Carvalho de Melo struct timeval now; 3566b57c93dSGerrit Renker unsigned long quarter_rtt; 3576b57c93dSGerrit Renker struct dccp_tx_hist_entry *packet; 3587c657876SArnaldo Carvalho de Melo 35959348b19SGerrit Renker BUG_ON(hctx == NULL); 3607c657876SArnaldo Carvalho de Melo 361b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3627c657876SArnaldo Carvalho de Melo 36378ad713dSGerrit Renker ccid3_hc_tx_update_s(hctx, len); 36478ad713dSGerrit Renker 3658c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 36659d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 36759348b19SGerrit Renker DCCP_WARN("packet doesn't exist in history!\n"); 3687c657876SArnaldo Carvalho de Melo return; 3697c657876SArnaldo Carvalho de Melo } 37059d203f9SArnaldo Carvalho de Melo if (unlikely(packet->dccphtx_sent)) { 37159348b19SGerrit Renker DCCP_WARN("no unsent packet in history!\n"); 3727c657876SArnaldo Carvalho de Melo return; 3737c657876SArnaldo Carvalho de Melo } 3748c60f3faSArnaldo Carvalho de Melo packet->dccphtx_tstamp = now; 3758c60f3faSArnaldo Carvalho de Melo packet->dccphtx_seqno = dp->dccps_gss; 3767c657876SArnaldo Carvalho de Melo /* 3771f2333aeSArnaldo Carvalho de Melo * Check if win_count have changed 3780e64e94eSGerrit Renker * Algorithm in "8.1. Window Counter Value" in RFC 4342. 3797c657876SArnaldo Carvalho de Melo */ 3806b5e633aSArnaldo Carvalho de Melo quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); 3816b5e633aSArnaldo Carvalho de Melo if (likely(hctx->ccid3hctx_rtt > 8)) 3826b5e633aSArnaldo Carvalho de Melo quarter_rtt /= hctx->ccid3hctx_rtt / 4; 3836b5e633aSArnaldo Carvalho de Melo 3847c657876SArnaldo Carvalho de Melo if (quarter_rtt > 0) { 3857c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3867c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + 3877c657876SArnaldo Carvalho de Melo min_t(unsigned long, quarter_rtt, 5)) % 16; 3881f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, window changed from " 3891f2333aeSArnaldo Carvalho de Melo "%u to %u!\n", 3907c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 391c1734376SArnaldo Carvalho de Melo packet->dccphtx_ccval, 3927c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count); 3937c657876SArnaldo Carvalho de Melo } 3941f2333aeSArnaldo Carvalho de Melo 3957c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 0; 396c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 3978c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 3987c657876SArnaldo Carvalho de Melo } 3997c657876SArnaldo Carvalho de Melo 4007c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 4017c657876SArnaldo Carvalho de Melo { 40259725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 40359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 4047c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4058c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 406b0e56780SArnaldo Carvalho de Melo struct timeval now; 4072a1fda6fSGerrit Renker unsigned long t_nfb; 4087c657876SArnaldo Carvalho de Melo u32 pinv; 4095c3fbb6aSGerrit Renker long r_sample, t_elapsed; 4101f2333aeSArnaldo Carvalho de Melo 41159348b19SGerrit Renker BUG_ON(hctx == NULL); 4127c657876SArnaldo Carvalho de Melo 4137c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4147c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4157c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4167c657876SArnaldo Carvalho de Melo return; 4177c657876SArnaldo Carvalho de Melo 4187c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4197c657876SArnaldo Carvalho de Melo 4207c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4217c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4227c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4235c3fbb6aSGerrit Renker /* get packet from history to look up t_recvdata */ 4248c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4258c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 42659d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 4275c3fbb6aSGerrit Renker DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " 42859348b19SGerrit Renker "in history!\n", dccp_role(sk), sk, 42959d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4307c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4317c657876SArnaldo Carvalho de Melo return; 4327c657876SArnaldo Carvalho de Melo } 4337c657876SArnaldo Carvalho de Melo 4341a21e49aSGerrit Renker /* Update receive rate in units of 64 * bytes/second */ 4351a21e49aSGerrit Renker hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate << 6; 4365c3fbb6aSGerrit Renker 4375c3fbb6aSGerrit Renker /* Update loss event rate */ 4385c3fbb6aSGerrit Renker pinv = opt_recv->ccid3or_loss_event_rate; 43945393a66SGerrit Renker if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ 4405c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 0; 44145393a66SGerrit Renker else /* can not exceed 100% */ 4425c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 1000000 / pinv; 4435c3fbb6aSGerrit Renker 444b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 4455c3fbb6aSGerrit Renker 4465c3fbb6aSGerrit Renker /* 4475c3fbb6aSGerrit Renker * Calculate new round trip sample as per [RFC 3448, 4.3] by 4485c3fbb6aSGerrit Renker * R_sample = (now - t_recvdata) - t_elapsed 4495c3fbb6aSGerrit Renker */ 450b0e56780SArnaldo Carvalho de Melo r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); 4515c3fbb6aSGerrit Renker t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; 4525c3fbb6aSGerrit Renker 4535c3fbb6aSGerrit Renker if (unlikely(r_sample <= 0)) { 4545c3fbb6aSGerrit Renker DCCP_WARN("WARNING: R_sample (%ld) <= 0!\n", r_sample); 4555c3fbb6aSGerrit Renker r_sample = 0; 4565c3fbb6aSGerrit Renker } else if (unlikely(r_sample <= t_elapsed)) 4575c3fbb6aSGerrit Renker DCCP_WARN("WARNING: r_sample=%ldus <= t_elapsed=%ldus\n", 45859348b19SGerrit Renker r_sample, t_elapsed); 4591a28599aSArnaldo Carvalho de Melo else 4601a28599aSArnaldo Carvalho de Melo r_sample -= t_elapsed; 4617c657876SArnaldo Carvalho de Melo 4627c657876SArnaldo Carvalho de Melo /* Update RTT estimate by 4637c657876SArnaldo Carvalho de Melo * If (No feedback recv) 4647c657876SArnaldo Carvalho de Melo * R = R_sample; 4657c657876SArnaldo Carvalho de Melo * Else 4667c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 4677c657876SArnaldo Carvalho de Melo * 4687c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 4697c657876SArnaldo Carvalho de Melo */ 4707c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 4711a21e49aSGerrit Renker /* 4721a21e49aSGerrit Renker * Larger Initial Windows [RFC 4342, sec. 5] 4731a21e49aSGerrit Renker * We deviate in that we use `s' instead of `MSS'. 4741a21e49aSGerrit Renker */ 475179ebc9fSGerrit Renker u16 w_init = min( 4 * hctx->ccid3hctx_s, 476a79ef76fSGerrit Renker max(2 * hctx->ccid3hctx_s, 4380)); 4777c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 4781a21e49aSGerrit Renker hctx->ccid3hctx_x = scaled_div(w_init<< 6, r_sample); 479a79ef76fSGerrit Renker hctx->ccid3hctx_t_ld = now; 480a79ef76fSGerrit Renker 481a79ef76fSGerrit Renker ccid3_update_send_time(hctx); 4825c3fbb6aSGerrit Renker 4835c3fbb6aSGerrit Renker ccid3_pr_debug("%s(%p), s=%u, w_init=%u, " 4845c3fbb6aSGerrit Renker "R_sample=%ldus, X=%u\n", dccp_role(sk), 4855c3fbb6aSGerrit Renker sk, hctx->ccid3hctx_s, w_init, r_sample, 4861a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4875c3fbb6aSGerrit Renker 488a79ef76fSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 489a79ef76fSGerrit Renker } else { 4905c3fbb6aSGerrit Renker hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + 4915c3fbb6aSGerrit Renker (u32)r_sample ) / 10; 4925c3fbb6aSGerrit Renker 493ff586298SGerrit Renker /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ 494ff586298SGerrit Renker if (hctx->ccid3hctx_p > 0) 495ff586298SGerrit Renker hctx->ccid3hctx_x_calc = 496ff586298SGerrit Renker tfrc_calc_x(hctx->ccid3hctx_s, 497ff586298SGerrit Renker hctx->ccid3hctx_rtt, 498ff586298SGerrit Renker hctx->ccid3hctx_p); 499a79ef76fSGerrit Renker ccid3_hc_tx_update_x(sk, &now); 5007c657876SArnaldo Carvalho de Melo 5015c3fbb6aSGerrit Renker ccid3_pr_debug("%s(%p), RTT=%uus (sample=%ldus), s=%u, " 5025c3fbb6aSGerrit Renker "p=%u, X_calc=%u, X=%u\n", dccp_role(sk), 5035c3fbb6aSGerrit Renker sk, hctx->ccid3hctx_rtt, r_sample, 5045c3fbb6aSGerrit Renker hctx->ccid3hctx_s, hctx->ccid3hctx_p, 5055c3fbb6aSGerrit Renker hctx->ccid3hctx_x_calc, 5061a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 5077c657876SArnaldo Carvalho de Melo } 5087c657876SArnaldo Carvalho de Melo 5097c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 5107c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5117c657876SArnaldo Carvalho de Melo 5127c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5138c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5148c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 515c530cfb1SArnaldo Carvalho de Melo /* 516c530cfb1SArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible that 5175d0dbc4aSGerrit Renker * we now can send a packet, so wake up dccp_wait_for_ccid 518c530cfb1SArnaldo Carvalho de Melo */ 519c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5208c60f3faSArnaldo Carvalho de Melo 5218a508ac2SGerrit Renker /* 5228a508ac2SGerrit Renker * Update timeout interval for the nofeedback timer. 5238a508ac2SGerrit Renker * We use a configuration option to increase the lower bound. 5248a508ac2SGerrit Renker * This can help avoid triggering the nofeedback timer too often 5258a508ac2SGerrit Renker * ('spinning') on LANs with small RTTs. 5268a508ac2SGerrit Renker */ 5275d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 5288a508ac2SGerrit Renker CONFIG_IP_DCCP_CCID3_RTO * 5298a508ac2SGerrit Renker (USEC_PER_SEC/1000) ); 5301f2333aeSArnaldo Carvalho de Melo /* 5311f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5328a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 5331f2333aeSArnaldo Carvalho de Melo */ 5348a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 5357c657876SArnaldo Carvalho de Melo 5361f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " 5371f2333aeSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5381f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 5392a1fda6fSGerrit Renker usecs_to_jiffies(t_nfb), t_nfb); 5407c657876SArnaldo Carvalho de Melo 5417c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5422a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 5437c657876SArnaldo Carvalho de Melo 5447c657876SArnaldo Carvalho de Melo /* set idle flag */ 5457c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5467c657876SArnaldo Carvalho de Melo break; 5475e19e3fcSGerrit Renker case TFRC_SSTATE_NO_SENT: 54826af3072SGerrit Renker if (dccp_sk(sk)->dccps_role == DCCP_ROLE_CLIENT) 54926af3072SGerrit Renker DCCP_WARN("Illegal ACK received - no packet sent\n"); 5505e19e3fcSGerrit Renker /* fall through */ 5515e19e3fcSGerrit Renker case TFRC_SSTATE_TERM: /* ignore feedback when closing */ 5527c657876SArnaldo Carvalho de Melo break; 5537c657876SArnaldo Carvalho de Melo } 5547c657876SArnaldo Carvalho de Melo } 5557c657876SArnaldo Carvalho de Melo 5562d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) 5577c657876SArnaldo Carvalho de Melo { 55859d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5597c657876SArnaldo Carvalho de Melo 56059d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 56159d203f9SArnaldo Carvalho de Melo 5622d0817d1SArnaldo Carvalho de Melo if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) 5637c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 5642d0817d1SArnaldo Carvalho de Melo return 0; 5657c657876SArnaldo Carvalho de Melo } 5667c657876SArnaldo Carvalho de Melo 5677c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5681f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5691f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5707c657876SArnaldo Carvalho de Melo { 5717c657876SArnaldo Carvalho de Melo int rc = 0; 57259725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 57359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5747c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 5757c657876SArnaldo Carvalho de Melo 57659d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 5777c657876SArnaldo Carvalho de Melo 5787c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5797c657876SArnaldo Carvalho de Melo 5807c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5817c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5827c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5837c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5847c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5857c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5867c657876SArnaldo Carvalho de Melo } 5877c657876SArnaldo Carvalho de Melo 5887c657876SArnaldo Carvalho de Melo switch (option) { 5897c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 59059d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 59159348b19SGerrit Renker DCCP_WARN("%s, sk=%p, invalid len %d " 59259348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 59359348b19SGerrit Renker dccp_role(sk), sk, len); 5947c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5957c657876SArnaldo Carvalho de Melo } else { 59660fe62e7SAndrea Bittau opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); 5977c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", 5987c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5997c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 6007c657876SArnaldo Carvalho de Melo } 6017c657876SArnaldo Carvalho de Melo break; 6027c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 6037c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 6047c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 6057c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", 6067c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6077c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 6087c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 6097c657876SArnaldo Carvalho de Melo break; 6107c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 61159d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 61259348b19SGerrit Renker DCCP_WARN("%s, sk=%p, invalid len %d " 61359348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 61459348b19SGerrit Renker dccp_role(sk), sk, len); 6157c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6167c657876SArnaldo Carvalho de Melo } else { 61760fe62e7SAndrea Bittau opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); 6187c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", 6197c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6207c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 6217c657876SArnaldo Carvalho de Melo } 6227c657876SArnaldo Carvalho de Melo break; 6237c657876SArnaldo Carvalho de Melo } 6247c657876SArnaldo Carvalho de Melo 6257c657876SArnaldo Carvalho de Melo return rc; 6267c657876SArnaldo Carvalho de Melo } 6277c657876SArnaldo Carvalho de Melo 62891f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 6297c657876SArnaldo Carvalho de Melo { 63091f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 6317c657876SArnaldo Carvalho de Melo 63278ad713dSGerrit Renker hctx->ccid3hctx_s = 0; 6337c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6347c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 635aa5d7df3SArnaldo Carvalho de Melo 636aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; 637aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 6387c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6397c657876SArnaldo Carvalho de Melo 6407c657876SArnaldo Carvalho de Melo return 0; 6417c657876SArnaldo Carvalho de Melo } 6427c657876SArnaldo Carvalho de Melo 6437c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6447c657876SArnaldo Carvalho de Melo { 64559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6467c657876SArnaldo Carvalho de Melo 6477c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 6487c657876SArnaldo Carvalho de Melo 6497c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6507c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6517c657876SArnaldo Carvalho de Melo 6527c657876SArnaldo Carvalho de Melo /* Empty packet history */ 6538c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 6547c657876SArnaldo Carvalho de Melo } 6557c657876SArnaldo Carvalho de Melo 6567c657876SArnaldo Carvalho de Melo /* 6577c657876SArnaldo Carvalho de Melo * RX Half Connection methods 6587c657876SArnaldo Carvalho de Melo */ 6597c657876SArnaldo Carvalho de Melo 66056724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6617c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6627c657876SArnaldo Carvalho de Melo { 6637c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6647c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6657c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6667c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6677c657876SArnaldo Carvalho de Melo }; 6687c657876SArnaldo Carvalho de Melo 6697c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6707c657876SArnaldo Carvalho de Melo } 6717c657876SArnaldo Carvalho de Melo #endif 6727c657876SArnaldo Carvalho de Melo 673c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 6741f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 6757c657876SArnaldo Carvalho de Melo { 67659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6777c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 6787c657876SArnaldo Carvalho de Melo 6797c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 6801f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 6811f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 6827c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 6837c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 6847c657876SArnaldo Carvalho de Melo } 6857c657876SArnaldo Carvalho de Melo 68678ad713dSGerrit Renker static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) 68778ad713dSGerrit Renker { 68878ad713dSGerrit Renker if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ 68978ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 69078ad713dSGerrit Renker else 69178ad713dSGerrit Renker hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : 69278ad713dSGerrit Renker (9 * hcrx->ccid3hcrx_s + len) / 10; 69378ad713dSGerrit Renker } 69478ad713dSGerrit Renker 6957c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 6967c657876SArnaldo Carvalho de Melo { 69759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6987c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 6998c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 700b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 7017c657876SArnaldo Carvalho de Melo 7027c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 7037c657876SArnaldo Carvalho de Melo 704b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 705b6ee3d4aSArnaldo Carvalho de Melo 7067c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 7077c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 7087c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 7097c657876SArnaldo Carvalho de Melo break; 7107c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: { 711b6ee3d4aSArnaldo Carvalho de Melo const u32 delta = timeval_delta(&now, 712b6ee3d4aSArnaldo Carvalho de Melo &hcrx->ccid3hcrx_tstamp_last_feedback); 713b9039a2aSGerrit Renker hcrx->ccid3hcrx_x_recv = 714b9039a2aSGerrit Renker scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 7157c657876SArnaldo Carvalho de Melo } 7167c657876SArnaldo Carvalho de Melo break; 71759348b19SGerrit Renker case TFRC_RSTATE_TERM: 71859348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 7197c657876SArnaldo Carvalho de Melo return; 7207c657876SArnaldo Carvalho de Melo } 7217c657876SArnaldo Carvalho de Melo 7228c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 72359d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 72459348b19SGerrit Renker DCCP_WARN("%s, sk=%p, no data packet in history!\n", 72559348b19SGerrit Renker dccp_role(sk), sk); 7267c657876SArnaldo Carvalho de Melo return; 7277c657876SArnaldo Carvalho de Melo } 7287c657876SArnaldo Carvalho de Melo 729b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 73066a377c5SIan McDonald hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; 7317c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7327c657876SArnaldo Carvalho de Melo 7337c657876SArnaldo Carvalho de Melo /* Convert to multiples of 10us */ 734b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time = 735b6ee3d4aSArnaldo Carvalho de Melo timeval_delta(&now, &packet->dccphrx_tstamp) / 10; 73645393a66SGerrit Renker 7377c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 73845393a66SGerrit Renker hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ 73945393a66SGerrit Renker else if (hcrx->ccid3hcrx_p > 1000000) { 74045393a66SGerrit Renker DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); 74145393a66SGerrit Renker hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ 74245393a66SGerrit Renker } else 7437c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 74445393a66SGerrit Renker 745507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7467c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7477c657876SArnaldo Carvalho de Melo } 7487c657876SArnaldo Carvalho de Melo 7492d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7507c657876SArnaldo Carvalho de Melo { 75159d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 75260fe62e7SAndrea Bittau __be32 x_recv, pinv; 7537c657876SArnaldo Carvalho de Melo 75459d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 75559d203f9SArnaldo Carvalho de Melo 75659d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7572d0817d1SArnaldo Carvalho de Melo return 0; 7587c657876SArnaldo Carvalho de Melo 75966a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 7604fded33bSArnaldo Carvalho de Melo 7614fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7622d0817d1SArnaldo Carvalho de Melo return 0; 7634fded33bSArnaldo Carvalho de Melo 7644fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7654fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7662d0817d1SArnaldo Carvalho de Melo 7672d0817d1SArnaldo Carvalho de Melo if ((hcrx->ccid3hcrx_elapsed_time != 0 && 7682d0817d1SArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 7692d0817d1SArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time)) || 7702d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb) || 7714fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7722d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7734fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 7742d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 7752d0817d1SArnaldo Carvalho de Melo return -1; 7762d0817d1SArnaldo Carvalho de Melo 7772d0817d1SArnaldo Carvalho de Melo return 0; 7787c657876SArnaldo Carvalho de Melo } 7797c657876SArnaldo Carvalho de Melo 7807c657876SArnaldo Carvalho de Melo /* calculate first loss interval 7817c657876SArnaldo Carvalho de Melo * 7827c657876SArnaldo Carvalho de Melo * returns estimated loss interval in usecs */ 7837c657876SArnaldo Carvalho de Melo 7847c657876SArnaldo Carvalho de Melo static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) 7857c657876SArnaldo Carvalho de Melo { 78659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7878c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *entry, *next, *tail = NULL; 788bfe24a6cSGerrit Renker u32 rtt, delta, x_recv, p; 789b6ee3d4aSArnaldo Carvalho de Melo struct timeval tstamp = { 0, }; 7907c657876SArnaldo Carvalho de Melo int interval = 0; 7917c657876SArnaldo Carvalho de Melo int win_count = 0; 7927c657876SArnaldo Carvalho de Melo int step = 0; 793bfe24a6cSGerrit Renker u64 fval; 7947c657876SArnaldo Carvalho de Melo 7958c60f3faSArnaldo Carvalho de Melo list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, 7968c60f3faSArnaldo Carvalho de Melo dccphrx_node) { 7978c60f3faSArnaldo Carvalho de Melo if (dccp_rx_hist_entry_data_packet(entry)) { 7987c657876SArnaldo Carvalho de Melo tail = entry; 7997c657876SArnaldo Carvalho de Melo 8007c657876SArnaldo Carvalho de Melo switch (step) { 8017c657876SArnaldo Carvalho de Melo case 0: 8028c60f3faSArnaldo Carvalho de Melo tstamp = entry->dccphrx_tstamp; 803c1734376SArnaldo Carvalho de Melo win_count = entry->dccphrx_ccval; 8047c657876SArnaldo Carvalho de Melo step = 1; 8057c657876SArnaldo Carvalho de Melo break; 8067c657876SArnaldo Carvalho de Melo case 1: 807c1734376SArnaldo Carvalho de Melo interval = win_count - entry->dccphrx_ccval; 8087c657876SArnaldo Carvalho de Melo if (interval < 0) 8097c657876SArnaldo Carvalho de Melo interval += TFRC_WIN_COUNT_LIMIT; 8107c657876SArnaldo Carvalho de Melo if (interval > 4) 8117c657876SArnaldo Carvalho de Melo goto found; 8127c657876SArnaldo Carvalho de Melo break; 8137c657876SArnaldo Carvalho de Melo } 8147c657876SArnaldo Carvalho de Melo } 8157c657876SArnaldo Carvalho de Melo } 8167c657876SArnaldo Carvalho de Melo 81759d203f9SArnaldo Carvalho de Melo if (unlikely(step == 0)) { 81859348b19SGerrit Renker DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", 81959348b19SGerrit Renker dccp_role(sk), sk); 8207c657876SArnaldo Carvalho de Melo return ~0; 8217c657876SArnaldo Carvalho de Melo } 8227c657876SArnaldo Carvalho de Melo 82359d203f9SArnaldo Carvalho de Melo if (unlikely(interval == 0)) { 82459348b19SGerrit Renker DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." 82559348b19SGerrit Renker "Defaulting to 1\n", dccp_role(sk), sk); 8267c657876SArnaldo Carvalho de Melo interval = 1; 8277c657876SArnaldo Carvalho de Melo } 8287c657876SArnaldo Carvalho de Melo found: 82966a377c5SIan McDonald if (!tail) { 83059348b19SGerrit Renker DCCP_CRIT("tail is null\n"); 83166a377c5SIan McDonald return ~0; 83266a377c5SIan McDonald } 833b6ee3d4aSArnaldo Carvalho de Melo rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; 8347c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", 8357c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, rtt); 83659348b19SGerrit Renker 837bfe24a6cSGerrit Renker /* 838bfe24a6cSGerrit Renker * Determine the length of the first loss interval via inverse lookup. 839bfe24a6cSGerrit Renker * Assume that X_recv can be computed by the throughput equation 840bfe24a6cSGerrit Renker * s 841bfe24a6cSGerrit Renker * X_recv = -------- 842bfe24a6cSGerrit Renker * R * fval 843bfe24a6cSGerrit Renker * Find some p such that f(p) = fval; return 1/p [RFC 3448, 6.3.1]. 844bfe24a6cSGerrit Renker */ 845bfe24a6cSGerrit Renker if (rtt == 0) { /* would result in divide-by-zero */ 846bfe24a6cSGerrit Renker DCCP_WARN("RTT==0, returning 1/p = 1\n"); 847bfe24a6cSGerrit Renker return 1000000; 84859348b19SGerrit Renker } 8497c657876SArnaldo Carvalho de Melo 850b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &tstamp); 851b0e56780SArnaldo Carvalho de Melo delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); 852b9039a2aSGerrit Renker x_recv = scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 8537c657876SArnaldo Carvalho de Melo 854bfe24a6cSGerrit Renker if (x_recv == 0) { /* would also trigger divide-by-zero */ 855bfe24a6cSGerrit Renker DCCP_WARN("X_recv==0\n"); 856bfe24a6cSGerrit Renker if ((x_recv = hcrx->ccid3hcrx_x_recv) == 0) { 857bfe24a6cSGerrit Renker DCCP_BUG("stored value of X_recv is zero"); 858bfe24a6cSGerrit Renker return 1000000; 859bfe24a6cSGerrit Renker } 86066a377c5SIan McDonald } 86166a377c5SIan McDonald 862bfe24a6cSGerrit Renker fval = scaled_div(hcrx->ccid3hcrx_s, rtt); 863bfe24a6cSGerrit Renker fval = scaled_div32(fval, x_recv); 86436729c1aSArnaldo Carvalho de Melo p = tfrc_calc_x_reverse_lookup(fval); 865bfe24a6cSGerrit Renker 8661f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " 8671f2333aeSArnaldo Carvalho de Melo "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 8687c657876SArnaldo Carvalho de Melo 8697c657876SArnaldo Carvalho de Melo if (p == 0) 8707c657876SArnaldo Carvalho de Melo return ~0; 8717c657876SArnaldo Carvalho de Melo else 8727c657876SArnaldo Carvalho de Melo return 1000000 / p; 8737c657876SArnaldo Carvalho de Melo } 8747c657876SArnaldo Carvalho de Melo 8757c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) 8767c657876SArnaldo Carvalho de Melo { 87759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 878fc747e82SIan McDonald struct dccp_li_hist_entry *head; 87966a377c5SIan McDonald u64 seq_temp; 8807c657876SArnaldo Carvalho de Melo 88166a377c5SIan McDonald if (list_empty(&hcrx->ccid3hcrx_li_hist)) { 88266a377c5SIan McDonald if (!dccp_li_hist_interval_new(ccid3_li_hist, 88366a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) 884ae6706f0SArnaldo Carvalho de Melo return; 88566a377c5SIan McDonald 886fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 887fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 888fc747e82SIan McDonald head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); 88966a377c5SIan McDonald } else { 89066a377c5SIan McDonald struct dccp_li_hist_entry *entry; 89166a377c5SIan McDonald struct list_head *tail; 89266a377c5SIan McDonald 893fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 894fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 89566a377c5SIan McDonald /* FIXME win count check removed as was wrong */ 89666a377c5SIan McDonald /* should make this check with receive history */ 89766a377c5SIan McDonald /* and compare there as per section 10.2 of RFC4342 */ 89866a377c5SIan McDonald 89966a377c5SIan McDonald /* new loss event detected */ 90066a377c5SIan McDonald /* calculate last interval length */ 90166a377c5SIan McDonald seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); 90254e6ecb2SChristoph Lameter entry = dccp_li_hist_entry_new(ccid3_li_hist, GFP_ATOMIC); 90366a377c5SIan McDonald 90466a377c5SIan McDonald if (entry == NULL) { 90559348b19SGerrit Renker DCCP_BUG("out of memory - can not allocate entry"); 90666a377c5SIan McDonald return; 9077c657876SArnaldo Carvalho de Melo } 9087c657876SArnaldo Carvalho de Melo 90966a377c5SIan McDonald list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); 91066a377c5SIan McDonald 91166a377c5SIan McDonald tail = hcrx->ccid3hcrx_li_hist.prev; 91266a377c5SIan McDonald list_del(tail); 91366a377c5SIan McDonald kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); 91466a377c5SIan McDonald 91566a377c5SIan McDonald /* Create the newest interval */ 91666a377c5SIan McDonald entry->dccplih_seqno = seq_loss; 91766a377c5SIan McDonald entry->dccplih_interval = seq_temp; 91866a377c5SIan McDonald entry->dccplih_win_count = win_loss; 91966a377c5SIan McDonald } 92066a377c5SIan McDonald } 92166a377c5SIan McDonald 92266a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 92366a377c5SIan McDonald struct dccp_rx_hist_entry *packet) 9247c657876SArnaldo Carvalho de Melo { 92559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 92666a377c5SIan McDonald struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); 92766a377c5SIan McDonald u64 seqno = packet->dccphrx_seqno; 92866a377c5SIan McDonald u64 tmp_seqno; 92966a377c5SIan McDonald int loss = 0; 93066a377c5SIan McDonald u8 ccval; 9317c657876SArnaldo Carvalho de Melo 93266a377c5SIan McDonald 93366a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 93466a377c5SIan McDonald 93566a377c5SIan McDonald if (!rx_hist || 93666a377c5SIan McDonald follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 93766a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 93866a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 93966a377c5SIan McDonald goto detect_out; 94066a377c5SIan McDonald } 94166a377c5SIan McDonald 94266a377c5SIan McDonald 94366a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 94466a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 94566a377c5SIan McDonald loss = 1; 94666a377c5SIan McDonald ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, 94766a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 94866a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 94966a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 95066a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 95166a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 95266a377c5SIan McDonald while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 95366a377c5SIan McDonald tmp_seqno, &ccval)) { 95466a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 95566a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 95666a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 95766a377c5SIan McDonald } 95866a377c5SIan McDonald } 95966a377c5SIan McDonald 96066a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 96166a377c5SIan McDonald /* but works at moment */ 96266a377c5SIan McDonald if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 96366a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 96466a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 96566a377c5SIan McDonald } 96666a377c5SIan McDonald 96766a377c5SIan McDonald detect_out: 96866a377c5SIan McDonald dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 96966a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 97066a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 97166a377c5SIan McDonald return loss; 9727c657876SArnaldo Carvalho de Melo } 9737c657876SArnaldo Carvalho de Melo 9747c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 9757c657876SArnaldo Carvalho de Melo { 97659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9774fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 9788c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 9797c657876SArnaldo Carvalho de Melo struct timeval now; 98066a377c5SIan McDonald u32 p_prev, rtt_prev, r_sample, t_elapsed; 98178ad713dSGerrit Renker int loss, payload_size; 9821f2333aeSArnaldo Carvalho de Melo 98359348b19SGerrit Renker BUG_ON(hcrx == NULL); 9847c657876SArnaldo Carvalho de Melo 98559725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 9864fded33bSArnaldo Carvalho de Melo 9877c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 9887c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 9897c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 9907c657876SArnaldo Carvalho de Melo return; 9917c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 9924fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 9937c657876SArnaldo Carvalho de Melo break; 99466a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 995b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 996b3a3077dSArnaldo Carvalho de Melo timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); 997b3a3077dSArnaldo Carvalho de Melo r_sample = timeval_usecs(&now); 998b3a3077dSArnaldo Carvalho de Melo t_elapsed = opt_recv->dccpor_elapsed_time * 10; 999b3a3077dSArnaldo Carvalho de Melo 1000b3a3077dSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 100159348b19SGerrit Renker DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", 100259348b19SGerrit Renker r_sample, t_elapsed); 1003b3a3077dSArnaldo Carvalho de Melo else 1004b3a3077dSArnaldo Carvalho de Melo r_sample -= t_elapsed; 1005b3a3077dSArnaldo Carvalho de Melo 1006b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 1007b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 1008b3a3077dSArnaldo Carvalho de Melo else 1009b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 1010b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 1011b3a3077dSArnaldo Carvalho de Melo 101266a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 101366a377c5SIan McDonald ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", 10144fded33bSArnaldo Carvalho de Melo dccp_role(sk), hcrx->ccid3hcrx_rtt, 10154fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 10167c657876SArnaldo Carvalho de Melo break; 10177c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 10187c657876SArnaldo Carvalho de Melo break; 101959d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 10207c657876SArnaldo Carvalho de Melo return; 10217c657876SArnaldo Carvalho de Melo } 10227c657876SArnaldo Carvalho de Melo 1023b0e56780SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, 102454e6ecb2SChristoph Lameter skb, GFP_ATOMIC); 102559d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 102659348b19SGerrit Renker DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " 102759348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 10287c657876SArnaldo Carvalho de Melo return; 10297c657876SArnaldo Carvalho de Melo } 10307c657876SArnaldo Carvalho de Melo 103166a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 10327c657876SArnaldo Carvalho de Melo 10337c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 10347c657876SArnaldo Carvalho de Melo return; 10357c657876SArnaldo Carvalho de Melo 103678ad713dSGerrit Renker payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; 103778ad713dSGerrit Renker ccid3_hc_rx_update_s(hcrx, payload_size); 103878ad713dSGerrit Renker 10397c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 10407c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 10411f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " 10421f2333aeSArnaldo Carvalho de Melo "feedback\n", 10431f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 10441f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 10457c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10467c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 10477c657876SArnaldo Carvalho de Melo return; 10487c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 104978ad713dSGerrit Renker hcrx->ccid3hcrx_bytes_recv += payload_size; 105066a377c5SIan McDonald if (loss) 1051b6ee3d4aSArnaldo Carvalho de Melo break; 1052b6ee3d4aSArnaldo Carvalho de Melo 1053b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 1054b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= 10554fded33bSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt) { 1056b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 10577c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10587c657876SArnaldo Carvalho de Melo } 10597c657876SArnaldo Carvalho de Melo return; 106059348b19SGerrit Renker case TFRC_RSTATE_TERM: 106159348b19SGerrit Renker DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); 10627c657876SArnaldo Carvalho de Melo return; 10637c657876SArnaldo Carvalho de Melo } 10647c657876SArnaldo Carvalho de Melo 10657c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 10664fded33bSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", 10674fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 10687c657876SArnaldo Carvalho de Melo 10697c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 10707c657876SArnaldo Carvalho de Melo 10717c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 1072c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 1073c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 1074c0996660SIan McDonald 10757c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 1076c0996660SIan McDonald if (i_mean != 0) 1077c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 107859348b19SGerrit Renker } else 107959348b19SGerrit Renker DCCP_BUG("empty loss history"); 10807c657876SArnaldo Carvalho de Melo 10817c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 10827c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10837c657876SArnaldo Carvalho de Melo return; 10847c657876SArnaldo Carvalho de Melo } 10857c657876SArnaldo Carvalho de Melo } 10867c657876SArnaldo Carvalho de Melo 108791f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 10887c657876SArnaldo Carvalho de Melo { 108991f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 10907c657876SArnaldo Carvalho de Melo 10917c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 10927c657876SArnaldo Carvalho de Melo 10937c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 10947c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 1095ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 1096b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); 1097954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; 109878ad713dSGerrit Renker hcrx->ccid3hcrx_s = 0; 1099954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ 11007c657876SArnaldo Carvalho de Melo return 0; 11017c657876SArnaldo Carvalho de Melo } 11027c657876SArnaldo Carvalho de Melo 11037c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 11047c657876SArnaldo Carvalho de Melo { 110559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 11067c657876SArnaldo Carvalho de Melo 110759d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 11087c657876SArnaldo Carvalho de Melo 11097c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 11107c657876SArnaldo Carvalho de Melo 11117c657876SArnaldo Carvalho de Melo /* Empty packet history */ 11128c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 11137c657876SArnaldo Carvalho de Melo 11147c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 1115ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); 11167c657876SArnaldo Carvalho de Melo } 11177c657876SArnaldo Carvalho de Melo 11182babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 11192babe1f6SArnaldo Carvalho de Melo { 112059725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 11212babe1f6SArnaldo Carvalho de Melo 112259c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 112359c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 112459c2353dSArnaldo Carvalho de Melo return; 112559c2353dSArnaldo Carvalho de Melo 112659d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 11272babe1f6SArnaldo Carvalho de Melo 11282babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 11292babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 11302babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 11312babe1f6SArnaldo Carvalho de Melo } 11322babe1f6SArnaldo Carvalho de Melo 11332babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 11342babe1f6SArnaldo Carvalho de Melo { 113559725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 11362babe1f6SArnaldo Carvalho de Melo 113759c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 113859c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 113959c2353dSArnaldo Carvalho de Melo return; 114059c2353dSArnaldo Carvalho de Melo 114159d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 11422babe1f6SArnaldo Carvalho de Melo 11432babe1f6SArnaldo Carvalho de Melo info->tcpi_rto = hctx->ccid3hctx_t_rto; 11442babe1f6SArnaldo Carvalho de Melo info->tcpi_rtt = hctx->ccid3hctx_rtt; 11452babe1f6SArnaldo Carvalho de Melo } 11462babe1f6SArnaldo Carvalho de Melo 114788f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 114888f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 114988f964dbSArnaldo Carvalho de Melo { 115088f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 115188f964dbSArnaldo Carvalho de Melo const void *val; 115288f964dbSArnaldo Carvalho de Melo 115388f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 115488f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 115588f964dbSArnaldo Carvalho de Melo return -EINVAL; 115688f964dbSArnaldo Carvalho de Melo 115788f964dbSArnaldo Carvalho de Melo switch (optname) { 115888f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 115988f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 116088f964dbSArnaldo Carvalho de Melo return -EINVAL; 116188f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 116288f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 116388f964dbSArnaldo Carvalho de Melo break; 116488f964dbSArnaldo Carvalho de Melo default: 116588f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 116688f964dbSArnaldo Carvalho de Melo } 116788f964dbSArnaldo Carvalho de Melo 116888f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 116988f964dbSArnaldo Carvalho de Melo return -EFAULT; 117088f964dbSArnaldo Carvalho de Melo 117188f964dbSArnaldo Carvalho de Melo return 0; 117288f964dbSArnaldo Carvalho de Melo } 117388f964dbSArnaldo Carvalho de Melo 117488f964dbSArnaldo Carvalho de Melo static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 117588f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 117688f964dbSArnaldo Carvalho de Melo { 117788f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 117888f964dbSArnaldo Carvalho de Melo const void *val; 117988f964dbSArnaldo Carvalho de Melo 118088f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 118188f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 118288f964dbSArnaldo Carvalho de Melo return -EINVAL; 118388f964dbSArnaldo Carvalho de Melo 118488f964dbSArnaldo Carvalho de Melo switch (optname) { 118588f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_TX_INFO: 118688f964dbSArnaldo Carvalho de Melo if (len < sizeof(hctx->ccid3hctx_tfrc)) 118788f964dbSArnaldo Carvalho de Melo return -EINVAL; 118888f964dbSArnaldo Carvalho de Melo len = sizeof(hctx->ccid3hctx_tfrc); 118988f964dbSArnaldo Carvalho de Melo val = &hctx->ccid3hctx_tfrc; 119088f964dbSArnaldo Carvalho de Melo break; 119188f964dbSArnaldo Carvalho de Melo default: 119288f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 119388f964dbSArnaldo Carvalho de Melo } 119488f964dbSArnaldo Carvalho de Melo 119588f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 119688f964dbSArnaldo Carvalho de Melo return -EFAULT; 119788f964dbSArnaldo Carvalho de Melo 119888f964dbSArnaldo Carvalho de Melo return 0; 119988f964dbSArnaldo Carvalho de Melo } 120088f964dbSArnaldo Carvalho de Melo 120191f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 12023dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 12037c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 12047c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 120591f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 12067c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 12077c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 12087c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 12097c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 12107c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 12117c657876SArnaldo Carvalho de Melo .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, 12127c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 121391f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 12147c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 12157c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 12167c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 12177c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 12182babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 12192babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 122088f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 122188f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 12227c657876SArnaldo Carvalho de Melo }; 12237c657876SArnaldo Carvalho de Melo 122456724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 12257c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 12267c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 122756724aa4SGerrit Renker #endif 12287c657876SArnaldo Carvalho de Melo 12297c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 12307c657876SArnaldo Carvalho de Melo { 12318c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 12327c657876SArnaldo Carvalho de Melo 12338c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 12348c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 12357c657876SArnaldo Carvalho de Melo goto out; 12367c657876SArnaldo Carvalho de Melo 12378c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 12388c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 12398c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 12407c657876SArnaldo Carvalho de Melo 1241ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = dccp_li_hist_new("ccid3"); 1242ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist == NULL) 12438c60f3faSArnaldo Carvalho de Melo goto out_free_tx; 12447c657876SArnaldo Carvalho de Melo 12457c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 12467c657876SArnaldo Carvalho de Melo if (rc != 0) 12477c657876SArnaldo Carvalho de Melo goto out_free_loss_interval_history; 12487c657876SArnaldo Carvalho de Melo out: 12497c657876SArnaldo Carvalho de Melo return rc; 12508c60f3faSArnaldo Carvalho de Melo 12517c657876SArnaldo Carvalho de Melo out_free_loss_interval_history: 1252ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1253ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12548c60f3faSArnaldo Carvalho de Melo out_free_tx: 12558c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12568c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12578c60f3faSArnaldo Carvalho de Melo out_free_rx: 12588c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12598c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12607c657876SArnaldo Carvalho de Melo goto out; 12617c657876SArnaldo Carvalho de Melo } 12627c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 12637c657876SArnaldo Carvalho de Melo 12647c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 12657c657876SArnaldo Carvalho de Melo { 12667c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 12677c657876SArnaldo Carvalho de Melo 12688c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 12698c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12708c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12717c657876SArnaldo Carvalho de Melo } 12728c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 12738c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12748c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12757c657876SArnaldo Carvalho de Melo } 1276ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist != NULL) { 1277ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1278ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12797c657876SArnaldo Carvalho de Melo } 12807c657876SArnaldo Carvalho de Melo } 12817c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 12827c657876SArnaldo Carvalho de Melo 1283e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 12841f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 12857c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 12867c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 12877c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1288