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 1269e8efc82SGerrit Renker hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6, 1271a21e49aSGerrit Renker hctx->ccid3hctx_x_recv * 2); 1289e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, 1299e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 1309e8efc82SGerrit Renker TFRC_T_MBI); 131b6ee3d4aSArnaldo Carvalho de Melo 1320f9e5b57SGerrit Renker } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) - 1330f9e5b57SGerrit Renker (suseconds_t)hctx->ccid3hctx_rtt >= 0) { 1341a21e49aSGerrit Renker 1359e8efc82SGerrit Renker hctx->ccid3hctx_x = 1369e8efc82SGerrit Renker max(2 * min(hctx->ccid3hctx_x, hctx->ccid3hctx_x_recv), 1379e8efc82SGerrit Renker scaled_div(((__u64)hctx->ccid3hctx_s) << 6, 1386b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 139a79ef76fSGerrit Renker hctx->ccid3hctx_t_ld = *now; 140ff586298SGerrit Renker } 141a79ef76fSGerrit Renker 14217893bc1SGerrit Renker if (hctx->ccid3hctx_x != old_x) 14317893bc1SGerrit Renker ccid3_update_send_time(hctx); 1447c657876SArnaldo Carvalho de Melo } 1457c657876SArnaldo Carvalho de Melo 14678ad713dSGerrit Renker /* 14778ad713dSGerrit Renker * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) 14878ad713dSGerrit Renker * @len: DCCP packet payload size in bytes 14978ad713dSGerrit Renker */ 15078ad713dSGerrit Renker static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) 15178ad713dSGerrit Renker { 15278ad713dSGerrit Renker if (unlikely(len == 0)) 15378ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 15478ad713dSGerrit Renker else 15578ad713dSGerrit Renker hctx->ccid3hctx_s = hctx->ccid3hctx_s == 0 ? len : 15678ad713dSGerrit Renker (9 * hctx->ccid3hctx_s + len) / 10; 15778ad713dSGerrit Renker /* 15878ad713dSGerrit Renker * Note: We could do a potential optimisation here - when `s' changes, 15978ad713dSGerrit Renker * recalculate sending rate and consequently t_ipi, t_delta, and 16078ad713dSGerrit Renker * t_now. This is however non-standard, and the benefits are not 16178ad713dSGerrit Renker * clear, so it is currently left out. 16278ad713dSGerrit Renker */ 16378ad713dSGerrit Renker } 16478ad713dSGerrit Renker 1659f8681dbSGerrit Renker /* 1669f8681dbSGerrit Renker * Update Window Counter using the algorithm from [RFC 4342, 8.1]. 1679f8681dbSGerrit Renker * The algorithm is not applicable if RTT < 4 microseconds. 1689f8681dbSGerrit Renker */ 1699f8681dbSGerrit Renker static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, 1709f8681dbSGerrit Renker struct timeval *now) 1719f8681dbSGerrit Renker { 1729f8681dbSGerrit Renker suseconds_t delta; 1739f8681dbSGerrit Renker u32 quarter_rtts; 1749f8681dbSGerrit Renker 1759f8681dbSGerrit Renker if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ 1769f8681dbSGerrit Renker return; 1779f8681dbSGerrit Renker 1789f8681dbSGerrit Renker delta = timeval_delta(now, &hctx->ccid3hctx_t_last_win_count); 1799f8681dbSGerrit Renker DCCP_BUG_ON(delta < 0); 1809f8681dbSGerrit Renker 1819f8681dbSGerrit Renker quarter_rtts = (u32)delta / (hctx->ccid3hctx_rtt / 4); 1829f8681dbSGerrit Renker 1839f8681dbSGerrit Renker if (quarter_rtts > 0) { 1849f8681dbSGerrit Renker hctx->ccid3hctx_t_last_win_count = *now; 1859f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); 1869f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ 1879f8681dbSGerrit Renker 1889f8681dbSGerrit Renker ccid3_pr_debug("now at %#X\n", hctx->ccid3hctx_last_win_count); 1899f8681dbSGerrit Renker } 1909f8681dbSGerrit Renker } 1919f8681dbSGerrit Renker 1927c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 1937c657876SArnaldo Carvalho de Melo { 1947c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 19559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1962a1fda6fSGerrit Renker unsigned long t_nfb = USEC_PER_SEC / 5; 1977c657876SArnaldo Carvalho de Melo 1987c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 1997c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 2007c657876SArnaldo Carvalho de Melo /* Try again later. */ 2017c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 20248e03eeeSGerrit Renker goto restart_timer; 2037c657876SArnaldo Carvalho de Melo } 2047c657876SArnaldo Carvalho de Melo 205a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk, 2067c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2077c657876SArnaldo Carvalho de Melo 2087c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 2097c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 210a79ef76fSGerrit Renker /* RFC 3448, 4.4: Halve send rate directly */ 2119e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2, 2129e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2139e8efc82SGerrit Renker TFRC_T_MBI); 2147c657876SArnaldo Carvalho de Melo 215a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u " 216a9672411SGerrit Renker "bytes/s\n", dccp_role(sk), sk, 2171f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 2181a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 21948e03eeeSGerrit Renker /* The value of R is still undefined and so we can not recompute 22048e03eeeSGerrit Renker * the timout value. Keep initial value as per [RFC 4342, 5]. */ 2212a1fda6fSGerrit Renker t_nfb = TFRC_INITIAL_TIMEOUT; 22217893bc1SGerrit Renker ccid3_update_send_time(hctx); 2237c657876SArnaldo Carvalho de Melo break; 2247c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 2251f2333aeSArnaldo Carvalho de Melo /* 2261f2333aeSArnaldo Carvalho de Melo * Check if IDLE since last timeout and recv rate is less than 2271a21e49aSGerrit Renker * 4 packets (in units of 64*bytes/sec) per RTT 2281f2333aeSArnaldo Carvalho de Melo */ 2291f2333aeSArnaldo Carvalho de Melo if (!hctx->ccid3hctx_idle || 2301a21e49aSGerrit Renker (hctx->ccid3hctx_x_recv >= 4 * 2318109b02bSArnaldo Carvalho de Melo scaled_div(((__u64)hctx->ccid3hctx_s) << 6, 2328109b02bSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt))) { 233a79ef76fSGerrit Renker struct timeval now; 234a79ef76fSGerrit Renker 235a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), not idle\n", 2361f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2377c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2387c657876SArnaldo Carvalho de Melo 239ff586298SGerrit Renker /* 240ff586298SGerrit Renker * Modify the cached value of X_recv [RFC 3448, 4.4] 241ff586298SGerrit Renker * 242ff586298SGerrit Renker * If (p == 0 || X_calc > 2 * X_recv) 2437c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2447c657876SArnaldo Carvalho de Melo * Else 2457c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2461a21e49aSGerrit Renker * 2471a21e49aSGerrit Renker * Note that X_recv is scaled by 2^6 while X_calc is not 2487c657876SArnaldo Carvalho de Melo */ 24944158306SGerrit Renker BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); 2507c657876SArnaldo Carvalho de Melo 25144158306SGerrit Renker if (hctx->ccid3hctx_p == 0 || 2528109b02bSArnaldo Carvalho de Melo (hctx->ccid3hctx_x_calc > 2538109b02bSArnaldo Carvalho de Melo (hctx->ccid3hctx_x_recv >> 5))) { 2541a21e49aSGerrit Renker 2551a21e49aSGerrit Renker hctx->ccid3hctx_x_recv = 2569e8efc82SGerrit Renker max(hctx->ccid3hctx_x_recv / 2, 2579e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2581a21e49aSGerrit Renker (2 * TFRC_T_MBI)); 2591a21e49aSGerrit Renker 260ff586298SGerrit Renker if (hctx->ccid3hctx_p == 0) 261ff586298SGerrit Renker dccp_timestamp(sk, &now); 2629e8efc82SGerrit Renker } else { 2639e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc; 2649e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 4; 2659e8efc82SGerrit Renker } 266ff586298SGerrit Renker /* Now recalculate X [RFC 3448, 4.3, step (4)] */ 267a79ef76fSGerrit Renker ccid3_hc_tx_update_x(sk, &now); 2687c657876SArnaldo Carvalho de Melo } 2696b5e633aSArnaldo Carvalho de Melo /* 2706b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2718a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 2728a508ac2SGerrit Renker * See comments in packet_recv() regarding the value of t_RTO. 2736b5e633aSArnaldo Carvalho de Melo */ 2748a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 2757c657876SArnaldo Carvalho de Melo break; 27659348b19SGerrit Renker case TFRC_SSTATE_NO_SENT: 277a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk), sk); 27859348b19SGerrit Renker /* fall through */ 27959348b19SGerrit Renker case TFRC_SSTATE_TERM: 2807c657876SArnaldo Carvalho de Melo goto out; 2817c657876SArnaldo Carvalho de Melo } 2827c657876SArnaldo Carvalho de Melo 2837c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 28448e03eeeSGerrit Renker 28548e03eeeSGerrit Renker restart_timer: 28648e03eeeSGerrit Renker sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2872a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 2887c657876SArnaldo Carvalho de Melo out: 2897c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2907c657876SArnaldo Carvalho de Melo sock_put(sk); 2917c657876SArnaldo Carvalho de Melo } 2927c657876SArnaldo Carvalho de Melo 2937da7f456SGerrit Renker /* 2947da7f456SGerrit Renker * returns 2957da7f456SGerrit Renker * > 0: delay (in msecs) that should pass before actually sending 2967da7f456SGerrit Renker * = 0: can send immediately 2977da7f456SGerrit Renker * < 0: error condition; do not send packet 2987da7f456SGerrit Renker */ 2996b57c93dSGerrit Renker static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) 3007c657876SArnaldo Carvalho de Melo { 3017c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 30259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3037c657876SArnaldo Carvalho de Melo struct timeval now; 3040f9e5b57SGerrit Renker suseconds_t delay; 3057c657876SArnaldo Carvalho de Melo 30659348b19SGerrit Renker BUG_ON(hctx == NULL); 3071f2333aeSArnaldo Carvalho de Melo 3087c657876SArnaldo Carvalho de Melo /* 309da335bafSGerrit Renker * This function is called only for Data and DataAck packets. Sending 310da335bafSGerrit Renker * zero-sized Data(Ack)s is theoretically possible, but for congestion 311da335bafSGerrit Renker * control this case is pathological - ignore it. 3127c657876SArnaldo Carvalho de Melo */ 3136b57c93dSGerrit Renker if (unlikely(skb->len == 0)) 314da335bafSGerrit Renker return -EBADMSG; 3157c657876SArnaldo Carvalho de Melo 316b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3177c657876SArnaldo Carvalho de Melo 3187c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3197c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3201f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3218109b02bSArnaldo Carvalho de Melo (jiffies + 3228109b02bSArnaldo Carvalho de Melo usecs_to_jiffies(TFRC_INITIAL_TIMEOUT))); 3237c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3247c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3257c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3267c657876SArnaldo Carvalho de Melo 3271a21e49aSGerrit Renker /* Set initial sending rate X/s to 1pps (X is scaled by 2^6) */ 3286b57c93dSGerrit Renker ccid3_hc_tx_update_s(hctx, skb->len); 3299e8efc82SGerrit Renker hctx->ccid3hctx_x = hctx->ccid3hctx_s; 3309e8efc82SGerrit Renker hctx->ccid3hctx_x <<= 6; 33178ad713dSGerrit Renker 33290feeb95SGerrit Renker /* First timeout, according to [RFC 3448, 4.2], is 1 second */ 33390feeb95SGerrit Renker hctx->ccid3hctx_t_ipi = USEC_PER_SEC; 33490feeb95SGerrit Renker /* Initial delta: minimum of 0.5 sec and t_gran/2 */ 33590feeb95SGerrit Renker hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; 33690feeb95SGerrit Renker 33790feeb95SGerrit Renker /* Set t_0 for initial packet */ 3387c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 3397c657876SArnaldo Carvalho de Melo break; 3407c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3417c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 34291cf5a17SGerrit Renker delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); 34391cf5a17SGerrit Renker /* 34491cf5a17SGerrit Renker * Scheduling of packet transmissions [RFC 3448, 4.6] 34591cf5a17SGerrit Renker * 34691cf5a17SGerrit Renker * if (t_now > t_nom - delta) 34791cf5a17SGerrit Renker * // send the packet now 34891cf5a17SGerrit Renker * else 34991cf5a17SGerrit Renker * // send the packet in (t_nom - t_now) milliseconds. 35091cf5a17SGerrit Renker */ 3510f9e5b57SGerrit Renker if (delay - (suseconds_t)hctx->ccid3hctx_delta >= 0) 3527da7f456SGerrit Renker return delay / 1000L; 3539f8681dbSGerrit Renker 3549f8681dbSGerrit Renker ccid3_hc_tx_update_win_count(hctx, &now); 3557c657876SArnaldo Carvalho de Melo break; 35659348b19SGerrit Renker case TFRC_SSTATE_TERM: 357a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 3587da7f456SGerrit Renker return -EINVAL; 3597c657876SArnaldo Carvalho de Melo } 3607c657876SArnaldo Carvalho de Melo 3617da7f456SGerrit Renker /* prepare to send now (add options etc.) */ 362507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 363e312d100SGerrit Renker DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 364e312d100SGerrit Renker 365e312d100SGerrit Renker /* set the nominal send time for the next following packet */ 3667da7f456SGerrit Renker timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); 3677da7f456SGerrit Renker 3687da7f456SGerrit Renker return 0; 3697c657876SArnaldo Carvalho de Melo } 3707c657876SArnaldo Carvalho de Melo 3718109b02bSArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, 3728109b02bSArnaldo Carvalho de Melo unsigned int len) 3737c657876SArnaldo Carvalho de Melo { 37459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3757c657876SArnaldo Carvalho de Melo struct timeval now; 3766b57c93dSGerrit Renker struct dccp_tx_hist_entry *packet; 3777c657876SArnaldo Carvalho de Melo 37859348b19SGerrit Renker BUG_ON(hctx == NULL); 3797c657876SArnaldo Carvalho de Melo 38078ad713dSGerrit Renker ccid3_hc_tx_update_s(hctx, len); 38178ad713dSGerrit Renker 382c5a1ae9aSGerrit Renker packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC); 38359d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 384c5a1ae9aSGerrit Renker DCCP_CRIT("packet history - out of memory!"); 3857c657876SArnaldo Carvalho de Melo return; 3867c657876SArnaldo Carvalho de Melo } 387c5a1ae9aSGerrit Renker dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, packet); 388c5a1ae9aSGerrit Renker 389c5a1ae9aSGerrit Renker dccp_timestamp(sk, &now); 3908c60f3faSArnaldo Carvalho de Melo packet->dccphtx_tstamp = now; 391c5a1ae9aSGerrit Renker packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss; 392c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 3938c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 394c5a1ae9aSGerrit Renker hctx->ccid3hctx_idle = 0; 3957c657876SArnaldo Carvalho de Melo } 3967c657876SArnaldo Carvalho de Melo 3977c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 3987c657876SArnaldo Carvalho de Melo { 39959725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 40059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 4017c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4028c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 403b0e56780SArnaldo Carvalho de Melo struct timeval now; 4042a1fda6fSGerrit Renker unsigned long t_nfb; 4057c657876SArnaldo Carvalho de Melo u32 pinv; 4061fba78b6SArnaldo Carvalho de Melo suseconds_t r_sample, t_elapsed; 4071f2333aeSArnaldo Carvalho de Melo 40859348b19SGerrit Renker BUG_ON(hctx == NULL); 4097c657876SArnaldo Carvalho de Melo 4107c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4117c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4127c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4137c657876SArnaldo Carvalho de Melo return; 4147c657876SArnaldo Carvalho de Melo 4157c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4167c657876SArnaldo Carvalho de Melo 4177c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4187c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4197c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4205c3fbb6aSGerrit Renker /* get packet from history to look up t_recvdata */ 4218c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4228c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 42359d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 4245c3fbb6aSGerrit Renker DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " 42559348b19SGerrit Renker "in history!\n", dccp_role(sk), sk, 42659d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4277c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4287c657876SArnaldo Carvalho de Melo return; 4297c657876SArnaldo Carvalho de Melo } 4307c657876SArnaldo Carvalho de Melo 4311a21e49aSGerrit Renker /* Update receive rate in units of 64 * bytes/second */ 4329e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; 4339e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 6; 4345c3fbb6aSGerrit Renker 4355c3fbb6aSGerrit Renker /* Update loss event rate */ 4365c3fbb6aSGerrit Renker pinv = opt_recv->ccid3or_loss_event_rate; 43745393a66SGerrit Renker if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ 4385c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 0; 43945393a66SGerrit Renker else /* can not exceed 100% */ 4405c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 1000000 / pinv; 4415c3fbb6aSGerrit Renker 442b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 4435c3fbb6aSGerrit Renker 4445c3fbb6aSGerrit Renker /* 4455c3fbb6aSGerrit Renker * Calculate new round trip sample as per [RFC 3448, 4.3] by 4465c3fbb6aSGerrit Renker * R_sample = (now - t_recvdata) - t_elapsed 4475c3fbb6aSGerrit Renker */ 448b0e56780SArnaldo Carvalho de Melo r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); 4495c3fbb6aSGerrit Renker t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; 4505c3fbb6aSGerrit Renker 4510f9e5b57SGerrit Renker DCCP_BUG_ON(r_sample < 0); 4520f9e5b57SGerrit Renker if (unlikely(r_sample <= t_elapsed)) 4531fba78b6SArnaldo Carvalho de Melo DCCP_WARN("WARNING: r_sample=%dus <= t_elapsed=%dus\n", 4541fba78b6SArnaldo Carvalho de Melo (int)r_sample, (int)t_elapsed); 4551a28599aSArnaldo Carvalho de Melo else 4561a28599aSArnaldo Carvalho de Melo r_sample -= t_elapsed; 457de553c18SGerrit Renker CCID3_RTT_SANITY_CHECK(r_sample); 4587c657876SArnaldo Carvalho de Melo 4597c657876SArnaldo Carvalho de Melo /* Update RTT estimate by 4607c657876SArnaldo Carvalho de Melo * If (No feedback recv) 4617c657876SArnaldo Carvalho de Melo * R = R_sample; 4627c657876SArnaldo Carvalho de Melo * Else 4637c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 4647c657876SArnaldo Carvalho de Melo * 4657c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 4667c657876SArnaldo Carvalho de Melo */ 4677c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 4681a21e49aSGerrit Renker /* 4691a21e49aSGerrit Renker * Larger Initial Windows [RFC 4342, sec. 5] 4701a21e49aSGerrit Renker * We deviate in that we use `s' instead of `MSS'. 4711a21e49aSGerrit Renker */ 4729e8efc82SGerrit Renker __u64 w_init = min(4 * hctx->ccid3hctx_s, 473a79ef76fSGerrit Renker max(2 * hctx->ccid3hctx_s, 4380)); 4747c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 4751a21e49aSGerrit Renker hctx->ccid3hctx_x = scaled_div(w_init << 6, r_sample); 476a79ef76fSGerrit Renker hctx->ccid3hctx_t_ld = now; 477a79ef76fSGerrit Renker 478a79ef76fSGerrit Renker ccid3_update_send_time(hctx); 4795c3fbb6aSGerrit Renker 4809e8efc82SGerrit Renker ccid3_pr_debug("%s(%p), s=%u, w_init=%llu, " 4811fba78b6SArnaldo Carvalho de Melo "R_sample=%dus, X=%u\n", dccp_role(sk), 4820f08461eSAndrew Morton sk, hctx->ccid3hctx_s, 4830f08461eSAndrew Morton (unsigned long long)w_init, 4848109b02bSArnaldo Carvalho de Melo (int)r_sample, 4851a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4865c3fbb6aSGerrit Renker 487a79ef76fSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 488a79ef76fSGerrit Renker } else { 4895c3fbb6aSGerrit Renker hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + 4905c3fbb6aSGerrit Renker (u32)r_sample) / 10; 4915c3fbb6aSGerrit Renker 492ff586298SGerrit Renker /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ 493ff586298SGerrit Renker if (hctx->ccid3hctx_p > 0) 494ff586298SGerrit Renker hctx->ccid3hctx_x_calc = 495ff586298SGerrit Renker tfrc_calc_x(hctx->ccid3hctx_s, 496ff586298SGerrit Renker hctx->ccid3hctx_rtt, 497ff586298SGerrit Renker hctx->ccid3hctx_p); 498a79ef76fSGerrit Renker ccid3_hc_tx_update_x(sk, &now); 4997c657876SArnaldo Carvalho de Melo 5001fba78b6SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p), RTT=%uus (sample=%dus), s=%u, " 5018109b02bSArnaldo Carvalho de Melo "p=%u, X_calc=%u, X_recv=%u, X=%u\n", 5028109b02bSArnaldo Carvalho de Melo dccp_role(sk), 5031fba78b6SArnaldo Carvalho de Melo sk, hctx->ccid3hctx_rtt, (int)r_sample, 5045c3fbb6aSGerrit Renker hctx->ccid3hctx_s, hctx->ccid3hctx_p, 5055c3fbb6aSGerrit Renker hctx->ccid3hctx_x_calc, 5069e8efc82SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6), 5071a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 5087c657876SArnaldo Carvalho de Melo } 5097c657876SArnaldo Carvalho de Melo 5107c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 5117c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5127c657876SArnaldo Carvalho de Melo 5137c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5148c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5158c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 516c530cfb1SArnaldo Carvalho de Melo /* 5178109b02bSArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible 5188109b02bSArnaldo Carvalho de Melo * that we now can send a packet, so wake up dccp_wait_for_ccid 519c530cfb1SArnaldo Carvalho de Melo */ 520c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5218c60f3faSArnaldo Carvalho de Melo 5228a508ac2SGerrit Renker /* 5238a508ac2SGerrit Renker * Update timeout interval for the nofeedback timer. 5248a508ac2SGerrit Renker * We use a configuration option to increase the lower bound. 5258109b02bSArnaldo Carvalho de Melo * This can help avoid triggering the nofeedback timer too 5268109b02bSArnaldo Carvalho de Melo * often ('spinning') on LANs with small RTTs. 5278a508ac2SGerrit Renker */ 5285d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 5298a508ac2SGerrit Renker CONFIG_IP_DCCP_CCID3_RTO * 5308a508ac2SGerrit Renker (USEC_PER_SEC/1000)); 5311f2333aeSArnaldo Carvalho de Melo /* 5321f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5338a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 5341f2333aeSArnaldo Carvalho de Melo */ 5358a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 5367c657876SArnaldo Carvalho de Melo 537a9672411SGerrit Renker ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " 5388109b02bSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5398109b02bSArnaldo Carvalho de Melo dccp_role(sk), 540a9672411SGerrit Renker sk, usecs_to_jiffies(t_nfb), t_nfb); 5417c657876SArnaldo Carvalho de Melo 5427c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5432a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 5447c657876SArnaldo Carvalho de Melo 5457c657876SArnaldo Carvalho de Melo /* set idle flag */ 5467c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5477c657876SArnaldo Carvalho de Melo break; 5485e19e3fcSGerrit Renker case TFRC_SSTATE_NO_SENT: 5498109b02bSArnaldo Carvalho de Melo /* 5508109b02bSArnaldo Carvalho de Melo * XXX when implementing bidirectional rx/tx check this again 5518109b02bSArnaldo Carvalho de Melo */ 55226af3072SGerrit Renker DCCP_WARN("Illegal ACK received - no packet sent\n"); 5535e19e3fcSGerrit Renker /* fall through */ 5545e19e3fcSGerrit Renker case TFRC_SSTATE_TERM: /* ignore feedback when closing */ 5557c657876SArnaldo Carvalho de Melo break; 5567c657876SArnaldo Carvalho de Melo } 5577c657876SArnaldo Carvalho de Melo } 5587c657876SArnaldo Carvalho de Melo 5597c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5601f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5611f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5627c657876SArnaldo Carvalho de Melo { 5637c657876SArnaldo Carvalho de Melo int rc = 0; 56459725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 56559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5667c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 5677c657876SArnaldo Carvalho de Melo 56859d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 5697c657876SArnaldo Carvalho de Melo 5707c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5717c657876SArnaldo Carvalho de Melo 5727c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5737c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5747c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5757c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5767c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5777c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5787c657876SArnaldo Carvalho de Melo } 5797c657876SArnaldo Carvalho de Melo 5807c657876SArnaldo Carvalho de Melo switch (option) { 5817c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 58259d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 583a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 58459348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 58559348b19SGerrit Renker dccp_role(sk), sk, len); 5867c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5877c657876SArnaldo Carvalho de Melo } else { 5888109b02bSArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = 5898109b02bSArnaldo Carvalho de Melo ntohl(*(__be32 *)value); 590a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", 5917c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5927c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 5937c657876SArnaldo Carvalho de Melo } 5947c657876SArnaldo Carvalho de Melo break; 5957c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 5967c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 5977c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 598a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n", 5997c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6007c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 6017c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 6027c657876SArnaldo Carvalho de Melo break; 6037c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 60459d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 605a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 60659348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 60759348b19SGerrit Renker dccp_role(sk), sk, len); 6087c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6097c657876SArnaldo Carvalho de Melo } else { 6108109b02bSArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 6118109b02bSArnaldo Carvalho de Melo ntohl(*(__be32 *)value); 612a9672411SGerrit Renker ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", 6137c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6147c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 6157c657876SArnaldo Carvalho de Melo } 6167c657876SArnaldo Carvalho de Melo break; 6177c657876SArnaldo Carvalho de Melo } 6187c657876SArnaldo Carvalho de Melo 6197c657876SArnaldo Carvalho de Melo return rc; 6207c657876SArnaldo Carvalho de Melo } 6217c657876SArnaldo Carvalho de Melo 62291f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 6237c657876SArnaldo Carvalho de Melo { 62491f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 6257c657876SArnaldo Carvalho de Melo 62678ad713dSGerrit Renker hctx->ccid3hctx_s = 0; 627fe0499aeSGerrit Renker hctx->ccid3hctx_rtt = 0; 6287c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6297c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 630aa5d7df3SArnaldo Carvalho de Melo 6318109b02bSArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = 6328109b02bSArnaldo Carvalho de Melo ccid3_hc_tx_no_feedback_timer; 633aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 6347c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6357c657876SArnaldo Carvalho de Melo 6367c657876SArnaldo Carvalho de Melo return 0; 6377c657876SArnaldo Carvalho de Melo } 6387c657876SArnaldo Carvalho de Melo 6397c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6407c657876SArnaldo Carvalho de Melo { 64159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6427c657876SArnaldo Carvalho de Melo 6437c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 6447c657876SArnaldo Carvalho de Melo 6457c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6467c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6477c657876SArnaldo Carvalho de Melo 6487c657876SArnaldo Carvalho de Melo /* Empty packet history */ 6498c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 6507c657876SArnaldo Carvalho de Melo } 6517c657876SArnaldo Carvalho de Melo 6527c657876SArnaldo Carvalho de Melo /* 6537c657876SArnaldo Carvalho de Melo * RX Half Connection methods 6547c657876SArnaldo Carvalho de Melo */ 6557c657876SArnaldo Carvalho de Melo 65656724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6577c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6587c657876SArnaldo Carvalho de Melo { 6597c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6607c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6617c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6627c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6637c657876SArnaldo Carvalho de Melo }; 6647c657876SArnaldo Carvalho de Melo 6657c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6667c657876SArnaldo Carvalho de Melo } 6677c657876SArnaldo Carvalho de Melo #endif 6687c657876SArnaldo Carvalho de Melo 669c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 6701f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 6717c657876SArnaldo Carvalho de Melo { 67259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6737c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 6747c657876SArnaldo Carvalho de Melo 6757c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 6761f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 6771f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 6787c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 6797c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 6807c657876SArnaldo Carvalho de Melo } 6817c657876SArnaldo Carvalho de Melo 68278ad713dSGerrit Renker static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) 68378ad713dSGerrit Renker { 68478ad713dSGerrit Renker if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ 68578ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 68678ad713dSGerrit Renker else 68778ad713dSGerrit Renker hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : 68878ad713dSGerrit Renker (9 * hcrx->ccid3hcrx_s + len) / 10; 68978ad713dSGerrit Renker } 69078ad713dSGerrit Renker 6917c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 6927c657876SArnaldo Carvalho de Melo { 69359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6947c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 6958c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 696b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 6970f9e5b57SGerrit Renker suseconds_t delta; 6987c657876SArnaldo Carvalho de Melo 699a9672411SGerrit Renker ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk), sk); 7007c657876SArnaldo Carvalho de Melo 701b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 702b6ee3d4aSArnaldo Carvalho de Melo 7037c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 7047c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 7057c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 7067c657876SArnaldo Carvalho de Melo break; 7070f9e5b57SGerrit Renker case TFRC_RSTATE_DATA: 7080f9e5b57SGerrit Renker delta = timeval_delta(&now, 709b6ee3d4aSArnaldo Carvalho de Melo &hcrx->ccid3hcrx_tstamp_last_feedback); 7100f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 711b9039a2aSGerrit Renker hcrx->ccid3hcrx_x_recv = 712b9039a2aSGerrit Renker scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 7137c657876SArnaldo Carvalho de Melo break; 71459348b19SGerrit Renker case TFRC_RSTATE_TERM: 715a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 7167c657876SArnaldo Carvalho de Melo return; 7177c657876SArnaldo Carvalho de Melo } 7187c657876SArnaldo Carvalho de Melo 7198c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 72059d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 721a9672411SGerrit Renker DCCP_WARN("%s(%p), no data packet in history!\n", 72259348b19SGerrit Renker dccp_role(sk), sk); 7237c657876SArnaldo Carvalho de Melo return; 7247c657876SArnaldo Carvalho de Melo } 7257c657876SArnaldo Carvalho de Melo 726b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 72766a377c5SIan McDonald hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; 7287c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7297c657876SArnaldo Carvalho de Melo 7300f9e5b57SGerrit Renker /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */ 7310f9e5b57SGerrit Renker delta = timeval_delta(&now, &packet->dccphrx_tstamp); 7320f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 7330f9e5b57SGerrit Renker hcrx->ccid3hcrx_elapsed_time = delta / 10; 73445393a66SGerrit Renker 7357c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 73645393a66SGerrit Renker hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ 73745393a66SGerrit Renker else if (hcrx->ccid3hcrx_p > 1000000) { 73845393a66SGerrit Renker DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); 73945393a66SGerrit Renker hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ 74045393a66SGerrit Renker } else 7417c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 74245393a66SGerrit Renker 743507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7447c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7457c657876SArnaldo Carvalho de Melo } 7467c657876SArnaldo Carvalho de Melo 7472d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7487c657876SArnaldo Carvalho de Melo { 74959d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 75060fe62e7SAndrea Bittau __be32 x_recv, pinv; 7517c657876SArnaldo Carvalho de Melo 75259d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 75359d203f9SArnaldo Carvalho de Melo 75459d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7552d0817d1SArnaldo Carvalho de Melo return 0; 7567c657876SArnaldo Carvalho de Melo 75766a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 7584fded33bSArnaldo Carvalho de Melo 7594fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7602d0817d1SArnaldo Carvalho de Melo return 0; 7614fded33bSArnaldo Carvalho de Melo 7624fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7634fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7642d0817d1SArnaldo Carvalho de Melo 7652d0817d1SArnaldo Carvalho de Melo if ((hcrx->ccid3hcrx_elapsed_time != 0 && 7662d0817d1SArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 7672d0817d1SArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time)) || 7682d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb) || 7694fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7702d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7714fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 7722d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 7732d0817d1SArnaldo Carvalho de Melo return -1; 7742d0817d1SArnaldo Carvalho de Melo 7752d0817d1SArnaldo Carvalho de Melo return 0; 7767c657876SArnaldo Carvalho de Melo } 7777c657876SArnaldo Carvalho de Melo 7787c657876SArnaldo Carvalho de Melo /* calculate first loss interval 7797c657876SArnaldo Carvalho de Melo * 7807c657876SArnaldo Carvalho de Melo * returns estimated loss interval in usecs */ 7817c657876SArnaldo Carvalho de Melo 7827c657876SArnaldo Carvalho de Melo static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) 7837c657876SArnaldo Carvalho de Melo { 78459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7858c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *entry, *next, *tail = NULL; 7860f9e5b57SGerrit Renker u32 x_recv, p; 7870f9e5b57SGerrit Renker suseconds_t rtt, delta; 788b6ee3d4aSArnaldo Carvalho de Melo struct timeval tstamp = { 0, }; 7897c657876SArnaldo Carvalho de Melo int interval = 0; 7907c657876SArnaldo Carvalho de Melo int win_count = 0; 7917c657876SArnaldo Carvalho de Melo int step = 0; 792bfe24a6cSGerrit Renker u64 fval; 7937c657876SArnaldo Carvalho de Melo 7948c60f3faSArnaldo Carvalho de Melo list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, 7958c60f3faSArnaldo Carvalho de Melo dccphrx_node) { 7968c60f3faSArnaldo Carvalho de Melo if (dccp_rx_hist_entry_data_packet(entry)) { 7977c657876SArnaldo Carvalho de Melo tail = entry; 7987c657876SArnaldo Carvalho de Melo 7997c657876SArnaldo Carvalho de Melo switch (step) { 8007c657876SArnaldo Carvalho de Melo case 0: 8018c60f3faSArnaldo Carvalho de Melo tstamp = entry->dccphrx_tstamp; 802c1734376SArnaldo Carvalho de Melo win_count = entry->dccphrx_ccval; 8037c657876SArnaldo Carvalho de Melo step = 1; 8047c657876SArnaldo Carvalho de Melo break; 8057c657876SArnaldo Carvalho de Melo case 1: 806c1734376SArnaldo Carvalho de Melo interval = win_count - entry->dccphrx_ccval; 8077c657876SArnaldo Carvalho de Melo if (interval < 0) 8087c657876SArnaldo Carvalho de Melo interval += TFRC_WIN_COUNT_LIMIT; 8097c657876SArnaldo Carvalho de Melo if (interval > 4) 8107c657876SArnaldo Carvalho de Melo goto found; 8117c657876SArnaldo Carvalho de Melo break; 8127c657876SArnaldo Carvalho de Melo } 8137c657876SArnaldo Carvalho de Melo } 8147c657876SArnaldo Carvalho de Melo } 8157c657876SArnaldo Carvalho de Melo 81659d203f9SArnaldo Carvalho de Melo if (unlikely(step == 0)) { 817a9672411SGerrit Renker DCCP_WARN("%s(%p), packet history has no data packets!\n", 81859348b19SGerrit Renker dccp_role(sk), sk); 8197c657876SArnaldo Carvalho de Melo return ~0; 8207c657876SArnaldo Carvalho de Melo } 8217c657876SArnaldo Carvalho de Melo 82259d203f9SArnaldo Carvalho de Melo if (unlikely(interval == 0)) { 823a9672411SGerrit Renker DCCP_WARN("%s(%p), Could not find a win_count interval > 0." 82459348b19SGerrit Renker "Defaulting to 1\n", dccp_role(sk), sk); 8257c657876SArnaldo Carvalho de Melo interval = 1; 8267c657876SArnaldo Carvalho de Melo } 8277c657876SArnaldo Carvalho de Melo found: 82866a377c5SIan McDonald if (!tail) { 82959348b19SGerrit Renker DCCP_CRIT("tail is null\n"); 83066a377c5SIan McDonald return ~0; 83166a377c5SIan McDonald } 8320f9e5b57SGerrit Renker 8330f9e5b57SGerrit Renker delta = timeval_delta(&tstamp, &tail->dccphrx_tstamp); 8340f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 8350f9e5b57SGerrit Renker 8360f9e5b57SGerrit Renker rtt = delta * 4 / interval; 8371fba78b6SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p), approximated RTT to %dus\n", 8381fba78b6SArnaldo Carvalho de Melo dccp_role(sk), sk, (int)rtt); 83959348b19SGerrit Renker 840bfe24a6cSGerrit Renker /* 841bfe24a6cSGerrit Renker * Determine the length of the first loss interval via inverse lookup. 842bfe24a6cSGerrit Renker * Assume that X_recv can be computed by the throughput equation 843bfe24a6cSGerrit Renker * s 844bfe24a6cSGerrit Renker * X_recv = -------- 845bfe24a6cSGerrit Renker * R * fval 846bfe24a6cSGerrit Renker * Find some p such that f(p) = fval; return 1/p [RFC 3448, 6.3.1]. 847bfe24a6cSGerrit Renker */ 848bfe24a6cSGerrit Renker if (rtt == 0) { /* would result in divide-by-zero */ 849832e3ca6SIan McDonald DCCP_WARN("RTT==0\n"); 850832e3ca6SIan McDonald return ~0; 85159348b19SGerrit Renker } 8527c657876SArnaldo Carvalho de Melo 853b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &tstamp); 854b0e56780SArnaldo Carvalho de Melo delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); 8550f9e5b57SGerrit Renker DCCP_BUG_ON(delta <= 0); 8567c657876SArnaldo Carvalho de Melo 8570f9e5b57SGerrit Renker x_recv = scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 858bfe24a6cSGerrit Renker if (x_recv == 0) { /* would also trigger divide-by-zero */ 859bfe24a6cSGerrit Renker DCCP_WARN("X_recv==0\n"); 860bfe24a6cSGerrit Renker if ((x_recv = hcrx->ccid3hcrx_x_recv) == 0) { 861bfe24a6cSGerrit Renker DCCP_BUG("stored value of X_recv is zero"); 862832e3ca6SIan McDonald return ~0; 863bfe24a6cSGerrit Renker } 86466a377c5SIan McDonald } 86566a377c5SIan McDonald 866bfe24a6cSGerrit Renker fval = scaled_div(hcrx->ccid3hcrx_s, rtt); 867bfe24a6cSGerrit Renker fval = scaled_div32(fval, x_recv); 86836729c1aSArnaldo Carvalho de Melo p = tfrc_calc_x_reverse_lookup(fval); 869bfe24a6cSGerrit Renker 870a9672411SGerrit Renker ccid3_pr_debug("%s(%p), receive rate=%u bytes/s, implied " 8711f2333aeSArnaldo Carvalho de Melo "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 8727c657876SArnaldo Carvalho de Melo 8737c657876SArnaldo Carvalho de Melo if (p == 0) 8747c657876SArnaldo Carvalho de Melo return ~0; 8757c657876SArnaldo Carvalho de Melo else 8767c657876SArnaldo Carvalho de Melo return 1000000 / p; 8777c657876SArnaldo Carvalho de Melo } 8787c657876SArnaldo Carvalho de Melo 8797c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) 8807c657876SArnaldo Carvalho de Melo { 88159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 882fc747e82SIan McDonald struct dccp_li_hist_entry *head; 88366a377c5SIan McDonald u64 seq_temp; 8847c657876SArnaldo Carvalho de Melo 88566a377c5SIan McDonald if (list_empty(&hcrx->ccid3hcrx_li_hist)) { 88666a377c5SIan McDonald if (!dccp_li_hist_interval_new(ccid3_li_hist, 88766a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) 888ae6706f0SArnaldo Carvalho de Melo return; 88966a377c5SIan McDonald 890fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 891fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 892fc747e82SIan McDonald head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); 89366a377c5SIan McDonald } else { 89466a377c5SIan McDonald struct dccp_li_hist_entry *entry; 89566a377c5SIan McDonald struct list_head *tail; 89666a377c5SIan McDonald 897fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 898fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 89966a377c5SIan McDonald /* FIXME win count check removed as was wrong */ 90066a377c5SIan McDonald /* should make this check with receive history */ 90166a377c5SIan McDonald /* and compare there as per section 10.2 of RFC4342 */ 90266a377c5SIan McDonald 90366a377c5SIan McDonald /* new loss event detected */ 90466a377c5SIan McDonald /* calculate last interval length */ 90566a377c5SIan McDonald seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); 90654e6ecb2SChristoph Lameter entry = dccp_li_hist_entry_new(ccid3_li_hist, GFP_ATOMIC); 90766a377c5SIan McDonald 90866a377c5SIan McDonald if (entry == NULL) { 90959348b19SGerrit Renker DCCP_BUG("out of memory - can not allocate entry"); 91066a377c5SIan McDonald return; 9117c657876SArnaldo Carvalho de Melo } 9127c657876SArnaldo Carvalho de Melo 91366a377c5SIan McDonald list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); 91466a377c5SIan McDonald 91566a377c5SIan McDonald tail = hcrx->ccid3hcrx_li_hist.prev; 91666a377c5SIan McDonald list_del(tail); 91766a377c5SIan McDonald kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); 91866a377c5SIan McDonald 91966a377c5SIan McDonald /* Create the newest interval */ 92066a377c5SIan McDonald entry->dccplih_seqno = seq_loss; 92166a377c5SIan McDonald entry->dccplih_interval = seq_temp; 92266a377c5SIan McDonald entry->dccplih_win_count = win_loss; 92366a377c5SIan McDonald } 92466a377c5SIan McDonald } 92566a377c5SIan McDonald 92666a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 92766a377c5SIan McDonald struct dccp_rx_hist_entry *packet) 9287c657876SArnaldo Carvalho de Melo { 92959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9308109b02bSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *rx_hist = 9318109b02bSArnaldo Carvalho de Melo dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); 93266a377c5SIan McDonald u64 seqno = packet->dccphrx_seqno; 93366a377c5SIan McDonald u64 tmp_seqno; 93466a377c5SIan McDonald int loss = 0; 93566a377c5SIan McDonald u8 ccval; 9367c657876SArnaldo Carvalho de Melo 93766a377c5SIan McDonald 93866a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 93966a377c5SIan McDonald 94066a377c5SIan McDonald if (!rx_hist || 94166a377c5SIan McDonald follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 94266a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 94366a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 94466a377c5SIan McDonald goto detect_out; 94566a377c5SIan McDonald } 94666a377c5SIan McDonald 94766a377c5SIan McDonald 94866a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 94966a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 95066a377c5SIan McDonald loss = 1; 95166a377c5SIan McDonald ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, 95266a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 95366a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 95466a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 95566a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 95666a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 95766a377c5SIan McDonald while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 95866a377c5SIan McDonald tmp_seqno, &ccval)) { 95966a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 96066a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 96166a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 96266a377c5SIan McDonald } 96366a377c5SIan McDonald } 96466a377c5SIan McDonald 96566a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 96666a377c5SIan McDonald /* but works at moment */ 96766a377c5SIan McDonald if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 96866a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 96966a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 97066a377c5SIan McDonald } 97166a377c5SIan McDonald 97266a377c5SIan McDonald detect_out: 97366a377c5SIan McDonald dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 97466a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 97566a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 97666a377c5SIan McDonald return loss; 9777c657876SArnaldo Carvalho de Melo } 9787c657876SArnaldo Carvalho de Melo 9797c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 9807c657876SArnaldo Carvalho de Melo { 98159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9824fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 9838c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 9847c657876SArnaldo Carvalho de Melo struct timeval now; 9850f9e5b57SGerrit Renker u32 p_prev, rtt_prev; 9860f9e5b57SGerrit Renker suseconds_t r_sample, t_elapsed; 98778ad713dSGerrit Renker int loss, payload_size; 9881f2333aeSArnaldo Carvalho de Melo 98959348b19SGerrit Renker BUG_ON(hcrx == NULL); 9907c657876SArnaldo Carvalho de Melo 99159725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 9924fded33bSArnaldo Carvalho de Melo 9937c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 9947c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 9957c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 9967c657876SArnaldo Carvalho de Melo return; 9977c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 9984fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 9997c657876SArnaldo Carvalho de Melo break; 100066a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 1001b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 1002b3a3077dSArnaldo Carvalho de Melo timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); 1003b3a3077dSArnaldo Carvalho de Melo r_sample = timeval_usecs(&now); 1004b3a3077dSArnaldo Carvalho de Melo t_elapsed = opt_recv->dccpor_elapsed_time * 10; 1005b3a3077dSArnaldo Carvalho de Melo 10060f9e5b57SGerrit Renker DCCP_BUG_ON(r_sample < 0); 1007b3a3077dSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 10080f9e5b57SGerrit Renker DCCP_WARN("r_sample=%ldus, t_elapsed=%ldus\n", 10090f08461eSAndrew Morton (long)r_sample, (long)t_elapsed); 1010b3a3077dSArnaldo Carvalho de Melo else 1011b3a3077dSArnaldo Carvalho de Melo r_sample -= t_elapsed; 1012de553c18SGerrit Renker CCID3_RTT_SANITY_CHECK(r_sample); 1013b3a3077dSArnaldo Carvalho de Melo 1014b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 1015b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 1016b3a3077dSArnaldo Carvalho de Melo else 1017b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 1018b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 1019b3a3077dSArnaldo Carvalho de Melo 102066a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 1021a9672411SGerrit Renker ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n", 1022a9672411SGerrit Renker dccp_role(sk), sk, hcrx->ccid3hcrx_rtt, 10234fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 10247c657876SArnaldo Carvalho de Melo break; 10257c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 10267c657876SArnaldo Carvalho de Melo break; 102759d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 10287c657876SArnaldo Carvalho de Melo return; 10297c657876SArnaldo Carvalho de Melo } 10307c657876SArnaldo Carvalho de Melo 1031b0e56780SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, 103254e6ecb2SChristoph Lameter skb, GFP_ATOMIC); 103359d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 1034a9672411SGerrit Renker DCCP_WARN("%s(%p), Not enough mem to add rx packet " 103559348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 10367c657876SArnaldo Carvalho de Melo return; 10377c657876SArnaldo Carvalho de Melo } 10387c657876SArnaldo Carvalho de Melo 103966a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 10407c657876SArnaldo Carvalho de Melo 10417c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 10427c657876SArnaldo Carvalho de Melo return; 10437c657876SArnaldo Carvalho de Melo 104478ad713dSGerrit Renker payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; 104578ad713dSGerrit Renker ccid3_hc_rx_update_s(hcrx, payload_size); 104678ad713dSGerrit Renker 10477c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 10487c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 1049a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial " 1050a9672411SGerrit Renker "feedback\n", dccp_role(sk), sk, 10511f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 10527c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10537c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 10547c657876SArnaldo Carvalho de Melo return; 10557c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 105678ad713dSGerrit Renker hcrx->ccid3hcrx_bytes_recv += payload_size; 105766a377c5SIan McDonald if (loss) 1058b6ee3d4aSArnaldo Carvalho de Melo break; 1059b6ee3d4aSArnaldo Carvalho de Melo 1060b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 10618109b02bSArnaldo Carvalho de Melo if ((timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) - 10628109b02bSArnaldo Carvalho de Melo (suseconds_t)hcrx->ccid3hcrx_rtt) >= 0) { 1063b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 10647c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10657c657876SArnaldo Carvalho de Melo } 10667c657876SArnaldo Carvalho de Melo return; 106759348b19SGerrit Renker case TFRC_RSTATE_TERM: 1068a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 10697c657876SArnaldo Carvalho de Melo return; 10707c657876SArnaldo Carvalho de Melo } 10717c657876SArnaldo Carvalho de Melo 10727c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 1073a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n", 10744fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 10757c657876SArnaldo Carvalho de Melo 10767c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 10777c657876SArnaldo Carvalho de Melo 10787c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 1079c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 1080c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 1081c0996660SIan McDonald 10827c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 1083c0996660SIan McDonald if (i_mean != 0) 1084c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 108559348b19SGerrit Renker } else 108659348b19SGerrit Renker DCCP_BUG("empty loss history"); 10877c657876SArnaldo Carvalho de Melo 10887c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 10897c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10907c657876SArnaldo Carvalho de Melo return; 10917c657876SArnaldo Carvalho de Melo } 10927c657876SArnaldo Carvalho de Melo } 10937c657876SArnaldo Carvalho de Melo 109491f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 10957c657876SArnaldo Carvalho de Melo { 109691f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 10977c657876SArnaldo Carvalho de Melo 1098a9672411SGerrit Renker ccid3_pr_debug("entry\n"); 10997c657876SArnaldo Carvalho de Melo 11007c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 11017c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 1102ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 1103b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); 1104954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; 110578ad713dSGerrit Renker hcrx->ccid3hcrx_s = 0; 1106fe0499aeSGerrit Renker hcrx->ccid3hcrx_rtt = 0; 11077c657876SArnaldo Carvalho de Melo return 0; 11087c657876SArnaldo Carvalho de Melo } 11097c657876SArnaldo Carvalho de Melo 11107c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 11117c657876SArnaldo Carvalho de Melo { 111259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 11137c657876SArnaldo Carvalho de Melo 111459d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 11157c657876SArnaldo Carvalho de Melo 11167c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 11177c657876SArnaldo Carvalho de Melo 11187c657876SArnaldo Carvalho de Melo /* Empty packet history */ 11198c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 11207c657876SArnaldo Carvalho de Melo 11217c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 1122ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); 11237c657876SArnaldo Carvalho de Melo } 11247c657876SArnaldo Carvalho de Melo 11252babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 11262babe1f6SArnaldo Carvalho de Melo { 112759725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 11282babe1f6SArnaldo Carvalho de Melo 112959c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 113059c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 113159c2353dSArnaldo Carvalho de Melo return; 113259c2353dSArnaldo Carvalho de Melo 113359d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 11342babe1f6SArnaldo Carvalho de Melo 11352babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 11362babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 11372babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 11382babe1f6SArnaldo Carvalho de Melo } 11392babe1f6SArnaldo Carvalho de Melo 11402babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 11412babe1f6SArnaldo Carvalho de Melo { 114259725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 11432babe1f6SArnaldo Carvalho de Melo 114459c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 114559c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 114659c2353dSArnaldo Carvalho de Melo return; 114759c2353dSArnaldo Carvalho de Melo 114859d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 11492babe1f6SArnaldo Carvalho de Melo 11502babe1f6SArnaldo Carvalho de Melo info->tcpi_rto = hctx->ccid3hctx_t_rto; 11512babe1f6SArnaldo Carvalho de Melo info->tcpi_rtt = hctx->ccid3hctx_rtt; 11522babe1f6SArnaldo Carvalho de Melo } 11532babe1f6SArnaldo Carvalho de Melo 115488f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 115588f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 115688f964dbSArnaldo Carvalho de Melo { 115788f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 115888f964dbSArnaldo Carvalho de Melo const void *val; 115988f964dbSArnaldo Carvalho de Melo 116088f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 116188f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 116288f964dbSArnaldo Carvalho de Melo return -EINVAL; 116388f964dbSArnaldo Carvalho de Melo 116488f964dbSArnaldo Carvalho de Melo switch (optname) { 116588f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 116688f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 116788f964dbSArnaldo Carvalho de Melo return -EINVAL; 116888f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 116988f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 117088f964dbSArnaldo Carvalho de Melo break; 117188f964dbSArnaldo Carvalho de Melo default: 117288f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 117388f964dbSArnaldo Carvalho de Melo } 117488f964dbSArnaldo Carvalho de Melo 117588f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 117688f964dbSArnaldo Carvalho de Melo return -EFAULT; 117788f964dbSArnaldo Carvalho de Melo 117888f964dbSArnaldo Carvalho de Melo return 0; 117988f964dbSArnaldo Carvalho de Melo } 118088f964dbSArnaldo Carvalho de Melo 118188f964dbSArnaldo Carvalho de Melo static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 118288f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 118388f964dbSArnaldo Carvalho de Melo { 118488f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 118588f964dbSArnaldo Carvalho de Melo const void *val; 118688f964dbSArnaldo Carvalho de Melo 118788f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 118888f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 118988f964dbSArnaldo Carvalho de Melo return -EINVAL; 119088f964dbSArnaldo Carvalho de Melo 119188f964dbSArnaldo Carvalho de Melo switch (optname) { 119288f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_TX_INFO: 119388f964dbSArnaldo Carvalho de Melo if (len < sizeof(hctx->ccid3hctx_tfrc)) 119488f964dbSArnaldo Carvalho de Melo return -EINVAL; 119588f964dbSArnaldo Carvalho de Melo len = sizeof(hctx->ccid3hctx_tfrc); 119688f964dbSArnaldo Carvalho de Melo val = &hctx->ccid3hctx_tfrc; 119788f964dbSArnaldo Carvalho de Melo break; 119888f964dbSArnaldo Carvalho de Melo default: 119988f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 120088f964dbSArnaldo Carvalho de Melo } 120188f964dbSArnaldo Carvalho de Melo 120288f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 120388f964dbSArnaldo Carvalho de Melo return -EFAULT; 120488f964dbSArnaldo Carvalho de Melo 120588f964dbSArnaldo Carvalho de Melo return 0; 120688f964dbSArnaldo Carvalho de Melo } 120788f964dbSArnaldo Carvalho de Melo 120891f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 12093dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 12107c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 12117c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 121291f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 12137c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 12147c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 12157c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 12167c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 12177c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 12187c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 121991f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 12207c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 12217c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 12227c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 12237c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 12242babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 12252babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 122688f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 122788f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 12287c657876SArnaldo Carvalho de Melo }; 12297c657876SArnaldo Carvalho de Melo 123056724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 12317c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 12327c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 123356724aa4SGerrit Renker #endif 12347c657876SArnaldo Carvalho de Melo 12357c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 12367c657876SArnaldo Carvalho de Melo { 12378c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 12387c657876SArnaldo Carvalho de Melo 12398c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 12408c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 12417c657876SArnaldo Carvalho de Melo goto out; 12427c657876SArnaldo Carvalho de Melo 12438c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 12448c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 12458c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 12467c657876SArnaldo Carvalho de Melo 1247ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = dccp_li_hist_new("ccid3"); 1248ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist == NULL) 12498c60f3faSArnaldo Carvalho de Melo goto out_free_tx; 12507c657876SArnaldo Carvalho de Melo 12517c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 12527c657876SArnaldo Carvalho de Melo if (rc != 0) 12537c657876SArnaldo Carvalho de Melo goto out_free_loss_interval_history; 12547c657876SArnaldo Carvalho de Melo out: 12557c657876SArnaldo Carvalho de Melo return rc; 12568c60f3faSArnaldo Carvalho de Melo 12577c657876SArnaldo Carvalho de Melo out_free_loss_interval_history: 1258ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1259ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12608c60f3faSArnaldo Carvalho de Melo out_free_tx: 12618c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12628c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12638c60f3faSArnaldo Carvalho de Melo out_free_rx: 12648c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12658c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12667c657876SArnaldo Carvalho de Melo goto out; 12677c657876SArnaldo Carvalho de Melo } 12687c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 12697c657876SArnaldo Carvalho de Melo 12707c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 12717c657876SArnaldo Carvalho de Melo { 12727c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 12737c657876SArnaldo Carvalho de Melo 12748c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 12758c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12768c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12777c657876SArnaldo Carvalho de Melo } 12788c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 12798c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12808c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12817c657876SArnaldo Carvalho de Melo } 1282ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist != NULL) { 1283ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1284ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12857c657876SArnaldo Carvalho de Melo } 12867c657876SArnaldo Carvalho de Melo } 12877c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 12887c657876SArnaldo Carvalho de Melo 1289e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 12901f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 12917c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 12927c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 12937c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1294