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 #include "../ccid.h" 377c657876SArnaldo Carvalho de Melo #include "../dccp.h" 384524b259SArnaldo Carvalho de Melo #include "lib/packet_history.h" 39ae6706f0SArnaldo Carvalho de Melo #include "lib/loss_interval.h" 4036729c1aSArnaldo Carvalho de Melo #include "lib/tfrc.h" 417c657876SArnaldo Carvalho de Melo #include "ccid3.h" 427c657876SArnaldo Carvalho de Melo 4356724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 4456724aa4SGerrit Renker static int ccid3_debug; 4556724aa4SGerrit Renker #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) 467c657876SArnaldo Carvalho de Melo #else 477c657876SArnaldo Carvalho de Melo #define ccid3_pr_debug(format, a...) 487c657876SArnaldo Carvalho de Melo #endif 497c657876SArnaldo Carvalho de Melo 50a1d3a355SArnaldo Carvalho de Melo static struct dccp_tx_hist *ccid3_tx_hist; 51a1d3a355SArnaldo Carvalho de Melo static struct dccp_rx_hist *ccid3_rx_hist; 52ae6706f0SArnaldo Carvalho de Melo static struct dccp_li_hist *ccid3_li_hist; 537c657876SArnaldo Carvalho de Melo 549bf17475SGerrit Renker /* 559bf17475SGerrit Renker * Transmitter Half-Connection Routines 569bf17475SGerrit Renker */ 5756724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 587c657876SArnaldo Carvalho de Melo static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) 597c657876SArnaldo Carvalho de Melo { 607c657876SArnaldo Carvalho de Melo static char *ccid3_state_names[] = { 617c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_SENT] = "NO_SENT", 627c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", 637c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_FBACK] = "FBACK", 647c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_TERM] = "TERM", 657c657876SArnaldo Carvalho de Melo }; 667c657876SArnaldo Carvalho de Melo 677c657876SArnaldo Carvalho de Melo return ccid3_state_names[state]; 687c657876SArnaldo Carvalho de Melo } 697c657876SArnaldo Carvalho de Melo #endif 707c657876SArnaldo Carvalho de Melo 71c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_tx_set_state(struct sock *sk, 721f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_tx_states state) 737c657876SArnaldo Carvalho de Melo { 7459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 757c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; 767c657876SArnaldo Carvalho de Melo 777c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 781f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_tx_state_name(oldstate), 791f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(state)); 807c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 817c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = state; 827c657876SArnaldo Carvalho de Melo } 837c657876SArnaldo Carvalho de Melo 8417893bc1SGerrit Renker /* 85a21f9f96SGerrit Renker * Compute the initial sending rate X_init according to RFC 3390: 86a21f9f96SGerrit Renker * w_init = min(4 * MSS, max(2 * MSS, 4380 bytes)) 87a21f9f96SGerrit Renker * X_init = w_init / RTT 88a21f9f96SGerrit Renker * For consistency with other parts of the code, X_init is scaled by 2^6. 89a21f9f96SGerrit Renker */ 90a21f9f96SGerrit Renker static inline u64 rfc3390_initial_rate(struct sock *sk) 91a21f9f96SGerrit Renker { 92a21f9f96SGerrit Renker const struct dccp_sock *dp = dccp_sk(sk); 93a21f9f96SGerrit Renker const __u32 w_init = min(4 * dp->dccps_mss_cache, 94a21f9f96SGerrit Renker max(2 * dp->dccps_mss_cache, 4380U)); 95a21f9f96SGerrit Renker 96a21f9f96SGerrit Renker return scaled_div(w_init << 6, ccid3_hc_tx_sk(sk)->ccid3hctx_rtt); 97a21f9f96SGerrit Renker } 98a21f9f96SGerrit Renker 99a21f9f96SGerrit Renker /* 1001266adeeSGerrit Renker * Recalculate t_ipi and delta (should be called whenever X changes) 10117893bc1SGerrit Renker */ 1021266adeeSGerrit Renker static inline void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hctx) 1037c657876SArnaldo Carvalho de Melo { 1041a21e49aSGerrit Renker /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */ 1051a21e49aSGerrit Renker hctx->ccid3hctx_t_ipi = scaled_div(hctx->ccid3hctx_s, 1061a21e49aSGerrit Renker hctx->ccid3hctx_x >> 6); 10717893bc1SGerrit Renker 1087c657876SArnaldo Carvalho de Melo /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ 1091f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, 1101f2333aeSArnaldo Carvalho de Melo TFRC_OPSYS_HALF_TIME_GRAN); 1118699be7dSIan McDonald 1121761f7d7SGerrit Renker ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n", 1138699be7dSIan McDonald hctx->ccid3hctx_t_ipi, hctx->ccid3hctx_delta, 1141761f7d7SGerrit Renker hctx->ccid3hctx_s, (unsigned)(hctx->ccid3hctx_x >> 6)); 1158699be7dSIan McDonald 1167c657876SArnaldo Carvalho de Melo } 1177c657876SArnaldo Carvalho de Melo /* 1187c657876SArnaldo Carvalho de Melo * Update X by 1197c657876SArnaldo Carvalho de Melo * If (p > 0) 1205c3fbb6aSGerrit Renker * X_calc = calcX(s, R, p); 1217c657876SArnaldo Carvalho de Melo * X = max(min(X_calc, 2 * X_recv), s / t_mbi); 1227c657876SArnaldo Carvalho de Melo * Else 1237c657876SArnaldo Carvalho de Melo * If (now - tld >= R) 1247c657876SArnaldo Carvalho de Melo * X = max(min(2 * X, 2 * X_recv), s / R); 1257c657876SArnaldo Carvalho de Melo * tld = now; 1265c3fbb6aSGerrit Renker * 1271a21e49aSGerrit Renker * Note: X and X_recv are both stored in units of 64 * bytes/second, to support 1281a21e49aSGerrit Renker * fine-grained resolution of sending rates. This requires scaling by 2^6 1291a21e49aSGerrit Renker * throughout the code. Only X_calc is unscaled (in bytes/second). 1301a21e49aSGerrit Renker * 1317c657876SArnaldo Carvalho de Melo */ 132a79ef76fSGerrit Renker static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now) 133a79ef76fSGerrit Renker 1347c657876SArnaldo Carvalho de Melo { 13559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1361a21e49aSGerrit Renker const __u64 old_x = hctx->ccid3hctx_x; 1377c657876SArnaldo Carvalho de Melo 13844158306SGerrit Renker if (hctx->ccid3hctx_p > 0) { 1391a21e49aSGerrit Renker 1409e8efc82SGerrit Renker hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6, 1411a21e49aSGerrit Renker hctx->ccid3hctx_x_recv * 2); 1429e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, 1439e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 1449e8efc82SGerrit Renker TFRC_T_MBI); 145b6ee3d4aSArnaldo Carvalho de Melo 1460f9e5b57SGerrit Renker } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) - 1470f9e5b57SGerrit Renker (suseconds_t)hctx->ccid3hctx_rtt >= 0) { 1481a21e49aSGerrit Renker 1499e8efc82SGerrit Renker hctx->ccid3hctx_x = 1509e8efc82SGerrit Renker max(2 * min(hctx->ccid3hctx_x, hctx->ccid3hctx_x_recv), 1519e8efc82SGerrit Renker scaled_div(((__u64)hctx->ccid3hctx_s) << 6, 1526b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 153a79ef76fSGerrit Renker hctx->ccid3hctx_t_ld = *now; 154ff586298SGerrit Renker } 155a79ef76fSGerrit Renker 1568699be7dSIan McDonald if (hctx->ccid3hctx_x != old_x) { 1571761f7d7SGerrit Renker ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, " 1581761f7d7SGerrit Renker "X_recv=%u\n", (unsigned)(old_x >> 6), 1591761f7d7SGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6), 1601761f7d7SGerrit Renker hctx->ccid3hctx_x_calc, 1611761f7d7SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6)); 1628699be7dSIan McDonald 1631266adeeSGerrit Renker ccid3_update_send_interval(hctx); 1647c657876SArnaldo Carvalho de Melo } 1658699be7dSIan McDonald } 1667c657876SArnaldo Carvalho de Melo 16778ad713dSGerrit Renker /* 16878ad713dSGerrit Renker * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) 16978ad713dSGerrit Renker * @len: DCCP packet payload size in bytes 17078ad713dSGerrit Renker */ 17178ad713dSGerrit Renker static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) 17278ad713dSGerrit Renker { 1731266adeeSGerrit Renker const u16 old_s = hctx->ccid3hctx_s; 1741266adeeSGerrit Renker 1751266adeeSGerrit Renker hctx->ccid3hctx_s = old_s == 0 ? len : (9 * old_s + len) / 10; 1761266adeeSGerrit Renker 1771266adeeSGerrit Renker if (hctx->ccid3hctx_s != old_s) 1781266adeeSGerrit Renker ccid3_update_send_interval(hctx); 17978ad713dSGerrit Renker } 18078ad713dSGerrit Renker 1819f8681dbSGerrit Renker /* 1829f8681dbSGerrit Renker * Update Window Counter using the algorithm from [RFC 4342, 8.1]. 1839f8681dbSGerrit Renker * The algorithm is not applicable if RTT < 4 microseconds. 1849f8681dbSGerrit Renker */ 1859f8681dbSGerrit Renker static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, 1869f8681dbSGerrit Renker struct timeval *now) 1879f8681dbSGerrit Renker { 1889f8681dbSGerrit Renker suseconds_t delta; 1899f8681dbSGerrit Renker u32 quarter_rtts; 1909f8681dbSGerrit Renker 1919f8681dbSGerrit Renker if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ 1929f8681dbSGerrit Renker return; 1939f8681dbSGerrit Renker 1949f8681dbSGerrit Renker delta = timeval_delta(now, &hctx->ccid3hctx_t_last_win_count); 1959f8681dbSGerrit Renker DCCP_BUG_ON(delta < 0); 1969f8681dbSGerrit Renker 1979f8681dbSGerrit Renker quarter_rtts = (u32)delta / (hctx->ccid3hctx_rtt / 4); 1989f8681dbSGerrit Renker 1999f8681dbSGerrit Renker if (quarter_rtts > 0) { 2009f8681dbSGerrit Renker hctx->ccid3hctx_t_last_win_count = *now; 2019f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); 2029f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ 2039f8681dbSGerrit Renker 2049f8681dbSGerrit Renker ccid3_pr_debug("now at %#X\n", hctx->ccid3hctx_last_win_count); 2059f8681dbSGerrit Renker } 2069f8681dbSGerrit Renker } 2079f8681dbSGerrit Renker 2087c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 2097c657876SArnaldo Carvalho de Melo { 2107c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 21159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2122a1fda6fSGerrit Renker unsigned long t_nfb = USEC_PER_SEC / 5; 2137c657876SArnaldo Carvalho de Melo 2147c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 2157c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 2167c657876SArnaldo Carvalho de Melo /* Try again later. */ 2177c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 21848e03eeeSGerrit Renker goto restart_timer; 2197c657876SArnaldo Carvalho de Melo } 2207c657876SArnaldo Carvalho de Melo 221a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk, 2227c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2237c657876SArnaldo Carvalho de Melo 2247c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 2257c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 226a79ef76fSGerrit Renker /* RFC 3448, 4.4: Halve send rate directly */ 2279e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2, 2289e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2299e8efc82SGerrit Renker TFRC_T_MBI); 2307c657876SArnaldo Carvalho de Melo 231a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u " 232a9672411SGerrit Renker "bytes/s\n", dccp_role(sk), sk, 2331f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 2341a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 23548e03eeeSGerrit Renker /* The value of R is still undefined and so we can not recompute 23648e03eeeSGerrit Renker * the timout value. Keep initial value as per [RFC 4342, 5]. */ 2372a1fda6fSGerrit Renker t_nfb = TFRC_INITIAL_TIMEOUT; 2381266adeeSGerrit Renker ccid3_update_send_interval(hctx); 2397c657876SArnaldo Carvalho de Melo break; 2407c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 2411f2333aeSArnaldo Carvalho de Melo /* 2421f2333aeSArnaldo Carvalho de Melo * Check if IDLE since last timeout and recv rate is less than 2431a21e49aSGerrit Renker * 4 packets (in units of 64*bytes/sec) per RTT 2441f2333aeSArnaldo Carvalho de Melo */ 2451f2333aeSArnaldo Carvalho de Melo if (!hctx->ccid3hctx_idle || 2461a21e49aSGerrit Renker (hctx->ccid3hctx_x_recv >= 4 * 2478109b02bSArnaldo Carvalho de Melo scaled_div(((__u64)hctx->ccid3hctx_s) << 6, 2488109b02bSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt))) { 249a79ef76fSGerrit Renker struct timeval now; 250a79ef76fSGerrit Renker 251a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), not idle\n", 2521f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2537c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2547c657876SArnaldo Carvalho de Melo 255ff586298SGerrit Renker /* 256ff586298SGerrit Renker * Modify the cached value of X_recv [RFC 3448, 4.4] 257ff586298SGerrit Renker * 258ff586298SGerrit Renker * If (p == 0 || X_calc > 2 * X_recv) 2597c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2607c657876SArnaldo Carvalho de Melo * Else 2617c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2621a21e49aSGerrit Renker * 2631a21e49aSGerrit Renker * Note that X_recv is scaled by 2^6 while X_calc is not 2647c657876SArnaldo Carvalho de Melo */ 26544158306SGerrit Renker BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); 2667c657876SArnaldo Carvalho de Melo 26744158306SGerrit Renker if (hctx->ccid3hctx_p == 0 || 2688109b02bSArnaldo Carvalho de Melo (hctx->ccid3hctx_x_calc > 2698109b02bSArnaldo Carvalho de Melo (hctx->ccid3hctx_x_recv >> 5))) { 2701a21e49aSGerrit Renker 2711a21e49aSGerrit Renker hctx->ccid3hctx_x_recv = 2729e8efc82SGerrit Renker max(hctx->ccid3hctx_x_recv / 2, 2739e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2741a21e49aSGerrit Renker (2 * TFRC_T_MBI)); 2751a21e49aSGerrit Renker 276ff586298SGerrit Renker if (hctx->ccid3hctx_p == 0) 277ff586298SGerrit Renker dccp_timestamp(sk, &now); 2789e8efc82SGerrit Renker } else { 2799e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc; 2809e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 4; 2819e8efc82SGerrit Renker } 282ff586298SGerrit Renker /* Now recalculate X [RFC 3448, 4.3, step (4)] */ 283a79ef76fSGerrit Renker ccid3_hc_tx_update_x(sk, &now); 2847c657876SArnaldo Carvalho de Melo } 2856b5e633aSArnaldo Carvalho de Melo /* 2866b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2878a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 2888a508ac2SGerrit Renker * See comments in packet_recv() regarding the value of t_RTO. 2896b5e633aSArnaldo Carvalho de Melo */ 2908a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 2917c657876SArnaldo Carvalho de Melo break; 29259348b19SGerrit Renker case TFRC_SSTATE_NO_SENT: 293a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk), sk); 29459348b19SGerrit Renker /* fall through */ 29559348b19SGerrit Renker case TFRC_SSTATE_TERM: 2967c657876SArnaldo Carvalho de Melo goto out; 2977c657876SArnaldo Carvalho de Melo } 2987c657876SArnaldo Carvalho de Melo 2997c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 30048e03eeeSGerrit Renker 30148e03eeeSGerrit Renker restart_timer: 30248e03eeeSGerrit Renker sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3032a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 3047c657876SArnaldo Carvalho de Melo out: 3057c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 3067c657876SArnaldo Carvalho de Melo sock_put(sk); 3077c657876SArnaldo Carvalho de Melo } 3087c657876SArnaldo Carvalho de Melo 3097da7f456SGerrit Renker /* 3107da7f456SGerrit Renker * returns 3117da7f456SGerrit Renker * > 0: delay (in msecs) that should pass before actually sending 3127da7f456SGerrit Renker * = 0: can send immediately 3137da7f456SGerrit Renker * < 0: error condition; do not send packet 3147da7f456SGerrit Renker */ 3156b57c93dSGerrit Renker static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) 3167c657876SArnaldo Carvalho de Melo { 3177c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 31859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3197c657876SArnaldo Carvalho de Melo struct timeval now; 3200f9e5b57SGerrit Renker suseconds_t delay; 3217c657876SArnaldo Carvalho de Melo 32259348b19SGerrit Renker BUG_ON(hctx == NULL); 3231f2333aeSArnaldo Carvalho de Melo 3247c657876SArnaldo Carvalho de Melo /* 325da335bafSGerrit Renker * This function is called only for Data and DataAck packets. Sending 326da335bafSGerrit Renker * zero-sized Data(Ack)s is theoretically possible, but for congestion 327da335bafSGerrit Renker * control this case is pathological - ignore it. 3287c657876SArnaldo Carvalho de Melo */ 3296b57c93dSGerrit Renker if (unlikely(skb->len == 0)) 330da335bafSGerrit Renker return -EBADMSG; 3317c657876SArnaldo Carvalho de Melo 332b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3337c657876SArnaldo Carvalho de Melo 3347c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3357c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3361f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3378109b02bSArnaldo Carvalho de Melo (jiffies + 3388109b02bSArnaldo Carvalho de Melo usecs_to_jiffies(TFRC_INITIAL_TIMEOUT))); 3397c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3407c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3417c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3427c657876SArnaldo Carvalho de Melo 3431a21e49aSGerrit Renker /* Set initial sending rate X/s to 1pps (X is scaled by 2^6) */ 3441266adeeSGerrit Renker hctx->ccid3hctx_x = hctx->ccid3hctx_s = skb->len; 3459e8efc82SGerrit Renker hctx->ccid3hctx_x <<= 6; 34678ad713dSGerrit Renker 34790feeb95SGerrit Renker /* First timeout, according to [RFC 3448, 4.2], is 1 second */ 34890feeb95SGerrit Renker hctx->ccid3hctx_t_ipi = USEC_PER_SEC; 34990feeb95SGerrit Renker /* Initial delta: minimum of 0.5 sec and t_gran/2 */ 35090feeb95SGerrit Renker hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; 35190feeb95SGerrit Renker 35290feeb95SGerrit Renker /* Set t_0 for initial packet */ 3537c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 3547c657876SArnaldo Carvalho de Melo break; 3557c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3567c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 35791cf5a17SGerrit Renker delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); 3588699be7dSIan McDonald ccid3_pr_debug("delay=%ld\n", (long)delay); 35991cf5a17SGerrit Renker /* 36091cf5a17SGerrit Renker * Scheduling of packet transmissions [RFC 3448, 4.6] 36191cf5a17SGerrit Renker * 36291cf5a17SGerrit Renker * if (t_now > t_nom - delta) 36391cf5a17SGerrit Renker * // send the packet now 36491cf5a17SGerrit Renker * else 36591cf5a17SGerrit Renker * // send the packet in (t_nom - t_now) milliseconds. 36691cf5a17SGerrit Renker */ 3670f9e5b57SGerrit Renker if (delay - (suseconds_t)hctx->ccid3hctx_delta >= 0) 3687da7f456SGerrit Renker return delay / 1000L; 3699f8681dbSGerrit Renker 3709f8681dbSGerrit Renker ccid3_hc_tx_update_win_count(hctx, &now); 3717c657876SArnaldo Carvalho de Melo break; 37259348b19SGerrit Renker case TFRC_SSTATE_TERM: 373a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 3747da7f456SGerrit Renker return -EINVAL; 3757c657876SArnaldo Carvalho de Melo } 3767c657876SArnaldo Carvalho de Melo 3777da7f456SGerrit Renker /* prepare to send now (add options etc.) */ 378507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 379e312d100SGerrit Renker DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 380e312d100SGerrit Renker 381e312d100SGerrit Renker /* set the nominal send time for the next following packet */ 3827da7f456SGerrit Renker timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); 3837da7f456SGerrit Renker 3847da7f456SGerrit Renker return 0; 3857c657876SArnaldo Carvalho de Melo } 3867c657876SArnaldo Carvalho de Melo 3878109b02bSArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, 3888109b02bSArnaldo Carvalho de Melo unsigned int len) 3897c657876SArnaldo Carvalho de Melo { 39059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3917c657876SArnaldo Carvalho de Melo struct timeval now; 3926b57c93dSGerrit Renker struct dccp_tx_hist_entry *packet; 3937c657876SArnaldo Carvalho de Melo 39459348b19SGerrit Renker BUG_ON(hctx == NULL); 3957c657876SArnaldo Carvalho de Melo 39678ad713dSGerrit Renker ccid3_hc_tx_update_s(hctx, len); 39778ad713dSGerrit Renker 398c5a1ae9aSGerrit Renker packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC); 39959d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 400c5a1ae9aSGerrit Renker DCCP_CRIT("packet history - out of memory!"); 4017c657876SArnaldo Carvalho de Melo return; 4027c657876SArnaldo Carvalho de Melo } 403c5a1ae9aSGerrit Renker dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, packet); 404c5a1ae9aSGerrit Renker 405c5a1ae9aSGerrit Renker dccp_timestamp(sk, &now); 4068c60f3faSArnaldo Carvalho de Melo packet->dccphtx_tstamp = now; 407c5a1ae9aSGerrit Renker packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss; 408c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 4098c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 410c5a1ae9aSGerrit Renker hctx->ccid3hctx_idle = 0; 4117c657876SArnaldo Carvalho de Melo } 4127c657876SArnaldo Carvalho de Melo 4137c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 4147c657876SArnaldo Carvalho de Melo { 41559725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 41659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 4177c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4188c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 419b0e56780SArnaldo Carvalho de Melo struct timeval now; 4202a1fda6fSGerrit Renker unsigned long t_nfb; 4217c657876SArnaldo Carvalho de Melo u32 pinv; 4221fba78b6SArnaldo Carvalho de Melo suseconds_t r_sample, t_elapsed; 4231f2333aeSArnaldo Carvalho de Melo 42459348b19SGerrit Renker BUG_ON(hctx == NULL); 4257c657876SArnaldo Carvalho de Melo 4267c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4277c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4287c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4297c657876SArnaldo Carvalho de Melo return; 4307c657876SArnaldo Carvalho de Melo 4317c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4327c657876SArnaldo Carvalho de Melo 4337c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4347c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4357c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4365c3fbb6aSGerrit Renker /* get packet from history to look up t_recvdata */ 4378c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4388c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 43959d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 4405c3fbb6aSGerrit Renker DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " 44159348b19SGerrit Renker "in history!\n", dccp_role(sk), sk, 44259d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4437c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4447c657876SArnaldo Carvalho de Melo return; 4457c657876SArnaldo Carvalho de Melo } 4467c657876SArnaldo Carvalho de Melo 4471a21e49aSGerrit Renker /* Update receive rate in units of 64 * bytes/second */ 4489e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; 4499e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 6; 4505c3fbb6aSGerrit Renker 4515c3fbb6aSGerrit Renker /* Update loss event rate */ 4525c3fbb6aSGerrit Renker pinv = opt_recv->ccid3or_loss_event_rate; 45345393a66SGerrit Renker if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ 4545c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 0; 45545393a66SGerrit Renker else /* can not exceed 100% */ 4565c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 1000000 / pinv; 4575c3fbb6aSGerrit Renker 458b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 4595c3fbb6aSGerrit Renker 4605c3fbb6aSGerrit Renker /* 4615c3fbb6aSGerrit Renker * Calculate new round trip sample as per [RFC 3448, 4.3] by 4625c3fbb6aSGerrit Renker * R_sample = (now - t_recvdata) - t_elapsed 4635c3fbb6aSGerrit Renker */ 464b0e56780SArnaldo Carvalho de Melo r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); 4655c3fbb6aSGerrit Renker t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; 4665c3fbb6aSGerrit Renker 4670f9e5b57SGerrit Renker DCCP_BUG_ON(r_sample < 0); 4680f9e5b57SGerrit Renker if (unlikely(r_sample <= t_elapsed)) 4691fba78b6SArnaldo Carvalho de Melo DCCP_WARN("WARNING: r_sample=%dus <= t_elapsed=%dus\n", 4701fba78b6SArnaldo Carvalho de Melo (int)r_sample, (int)t_elapsed); 4711a28599aSArnaldo Carvalho de Melo else 4721a28599aSArnaldo Carvalho de Melo r_sample -= t_elapsed; 473de553c18SGerrit Renker CCID3_RTT_SANITY_CHECK(r_sample); 4747c657876SArnaldo Carvalho de Melo 4757c657876SArnaldo Carvalho de Melo /* Update RTT estimate by 4767c657876SArnaldo Carvalho de Melo * If (No feedback recv) 4777c657876SArnaldo Carvalho de Melo * R = R_sample; 4787c657876SArnaldo Carvalho de Melo * Else 4797c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 4807c657876SArnaldo Carvalho de Melo * 4817c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 4827c657876SArnaldo Carvalho de Melo */ 4837c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 4841a21e49aSGerrit Renker /* 4851a21e49aSGerrit Renker * Larger Initial Windows [RFC 4342, sec. 5] 4861a21e49aSGerrit Renker */ 4877c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 488a21f9f96SGerrit Renker hctx->ccid3hctx_x = rfc3390_initial_rate(sk); 489a79ef76fSGerrit Renker hctx->ccid3hctx_t_ld = now; 490a79ef76fSGerrit Renker 4911266adeeSGerrit Renker ccid3_update_send_interval(hctx); 4925c3fbb6aSGerrit Renker 493a21f9f96SGerrit Renker ccid3_pr_debug("%s(%p), s=%u, MSS=%u, " 4941fba78b6SArnaldo Carvalho de Melo "R_sample=%dus, X=%u\n", dccp_role(sk), 4950f08461eSAndrew Morton sk, hctx->ccid3hctx_s, 496a21f9f96SGerrit Renker dp->dccps_mss_cache, (int)r_sample, 4971a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4985c3fbb6aSGerrit Renker 499a79ef76fSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 500a79ef76fSGerrit Renker } else { 5015c3fbb6aSGerrit Renker hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + 5025c3fbb6aSGerrit Renker (u32)r_sample) / 10; 5035c3fbb6aSGerrit Renker 504ff586298SGerrit Renker /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ 505ff586298SGerrit Renker if (hctx->ccid3hctx_p > 0) 506ff586298SGerrit Renker hctx->ccid3hctx_x_calc = 507ff586298SGerrit Renker tfrc_calc_x(hctx->ccid3hctx_s, 508ff586298SGerrit Renker hctx->ccid3hctx_rtt, 509ff586298SGerrit Renker hctx->ccid3hctx_p); 510a79ef76fSGerrit Renker ccid3_hc_tx_update_x(sk, &now); 5117c657876SArnaldo Carvalho de Melo 5121fba78b6SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p), RTT=%uus (sample=%dus), s=%u, " 5138109b02bSArnaldo Carvalho de Melo "p=%u, X_calc=%u, X_recv=%u, X=%u\n", 5148109b02bSArnaldo Carvalho de Melo dccp_role(sk), 5151fba78b6SArnaldo Carvalho de Melo sk, hctx->ccid3hctx_rtt, (int)r_sample, 5165c3fbb6aSGerrit Renker hctx->ccid3hctx_s, hctx->ccid3hctx_p, 5175c3fbb6aSGerrit Renker hctx->ccid3hctx_x_calc, 5189e8efc82SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6), 5191a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 5207c657876SArnaldo Carvalho de Melo } 5217c657876SArnaldo Carvalho de Melo 5227c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 5237c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5247c657876SArnaldo Carvalho de Melo 5257c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5268c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5278c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 528c530cfb1SArnaldo Carvalho de Melo /* 5298109b02bSArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible 5308109b02bSArnaldo Carvalho de Melo * that we now can send a packet, so wake up dccp_wait_for_ccid 531c530cfb1SArnaldo Carvalho de Melo */ 532c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5338c60f3faSArnaldo Carvalho de Melo 5348a508ac2SGerrit Renker /* 5358a508ac2SGerrit Renker * Update timeout interval for the nofeedback timer. 5368a508ac2SGerrit Renker * We use a configuration option to increase the lower bound. 5378109b02bSArnaldo Carvalho de Melo * This can help avoid triggering the nofeedback timer too 5388109b02bSArnaldo Carvalho de Melo * often ('spinning') on LANs with small RTTs. 5398a508ac2SGerrit Renker */ 5405d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 5418a508ac2SGerrit Renker CONFIG_IP_DCCP_CCID3_RTO * 5428a508ac2SGerrit Renker (USEC_PER_SEC/1000)); 5431f2333aeSArnaldo Carvalho de Melo /* 5441f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5458a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 5461f2333aeSArnaldo Carvalho de Melo */ 5478a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 5487c657876SArnaldo Carvalho de Melo 549a9672411SGerrit Renker ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " 5508109b02bSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5518109b02bSArnaldo Carvalho de Melo dccp_role(sk), 552a9672411SGerrit Renker sk, usecs_to_jiffies(t_nfb), t_nfb); 5537c657876SArnaldo Carvalho de Melo 5547c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5552a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 5567c657876SArnaldo Carvalho de Melo 5577c657876SArnaldo Carvalho de Melo /* set idle flag */ 5587c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5597c657876SArnaldo Carvalho de Melo break; 560151a9931SGerrit Renker case TFRC_SSTATE_NO_SENT: /* fall through */ 5615e19e3fcSGerrit Renker case TFRC_SSTATE_TERM: /* ignore feedback when closing */ 5627c657876SArnaldo Carvalho de Melo break; 5637c657876SArnaldo Carvalho de Melo } 5647c657876SArnaldo Carvalho de Melo } 5657c657876SArnaldo Carvalho de Melo 5667c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5671f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5681f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5697c657876SArnaldo Carvalho de Melo { 5707c657876SArnaldo Carvalho de Melo int rc = 0; 57159725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 57259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5737c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 5747c657876SArnaldo Carvalho de Melo 57559d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 5767c657876SArnaldo Carvalho de Melo 5777c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5787c657876SArnaldo Carvalho de Melo 5797c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5807c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5817c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5827c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5837c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5847c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5857c657876SArnaldo Carvalho de Melo } 5867c657876SArnaldo Carvalho de Melo 5877c657876SArnaldo Carvalho de Melo switch (option) { 5887c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 58959d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 590a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 59159348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 59259348b19SGerrit Renker dccp_role(sk), sk, len); 5937c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5947c657876SArnaldo Carvalho de Melo } else { 5958109b02bSArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = 5968109b02bSArnaldo Carvalho de Melo ntohl(*(__be32 *)value); 597a9672411SGerrit Renker ccid3_pr_debug("%s(%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; 605a9672411SGerrit Renker ccid3_pr_debug("%s(%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)) { 612a9672411SGerrit Renker DCCP_WARN("%s(%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 { 6178109b02bSArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 6188109b02bSArnaldo Carvalho de Melo ntohl(*(__be32 *)value); 619a9672411SGerrit Renker ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", 6207c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6217c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 6227c657876SArnaldo Carvalho de Melo } 6237c657876SArnaldo Carvalho de Melo break; 6247c657876SArnaldo Carvalho de Melo } 6257c657876SArnaldo Carvalho de Melo 6267c657876SArnaldo Carvalho de Melo return rc; 6277c657876SArnaldo Carvalho de Melo } 6287c657876SArnaldo Carvalho de Melo 62991f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 6307c657876SArnaldo Carvalho de Melo { 63191f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 6327c657876SArnaldo Carvalho de Melo 63378ad713dSGerrit Renker hctx->ccid3hctx_s = 0; 634fe0499aeSGerrit Renker hctx->ccid3hctx_rtt = 0; 6357c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6367c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 637aa5d7df3SArnaldo Carvalho de Melo 6388109b02bSArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = 6398109b02bSArnaldo Carvalho de Melo ccid3_hc_tx_no_feedback_timer; 640aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 6417c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6427c657876SArnaldo Carvalho de Melo 6437c657876SArnaldo Carvalho de Melo return 0; 6447c657876SArnaldo Carvalho de Melo } 6457c657876SArnaldo Carvalho de Melo 6467c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6477c657876SArnaldo Carvalho de Melo { 64859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6497c657876SArnaldo Carvalho de Melo 6507c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 6517c657876SArnaldo Carvalho de Melo 6527c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6537c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6547c657876SArnaldo Carvalho de Melo 6557c657876SArnaldo Carvalho de Melo /* Empty packet history */ 6568c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 6577c657876SArnaldo Carvalho de Melo } 6587c657876SArnaldo Carvalho de Melo 6599bf17475SGerrit Renker static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 6609bf17475SGerrit Renker { 6619bf17475SGerrit Renker const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6627c657876SArnaldo Carvalho de Melo 6639bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6649bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6659bf17475SGerrit Renker return; 6669bf17475SGerrit Renker 6679bf17475SGerrit Renker BUG_ON(hctx == NULL); 6689bf17475SGerrit Renker 6699bf17475SGerrit Renker info->tcpi_rto = hctx->ccid3hctx_t_rto; 6709bf17475SGerrit Renker info->tcpi_rtt = hctx->ccid3hctx_rtt; 6719bf17475SGerrit Renker } 6729bf17475SGerrit Renker 6739bf17475SGerrit Renker static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 6749bf17475SGerrit Renker u32 __user *optval, int __user *optlen) 6759bf17475SGerrit Renker { 6769bf17475SGerrit Renker const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6779bf17475SGerrit Renker const void *val; 6789bf17475SGerrit Renker 6799bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6809bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6819bf17475SGerrit Renker return -EINVAL; 6829bf17475SGerrit Renker 6839bf17475SGerrit Renker switch (optname) { 6849bf17475SGerrit Renker case DCCP_SOCKOPT_CCID_TX_INFO: 6859bf17475SGerrit Renker if (len < sizeof(hctx->ccid3hctx_tfrc)) 6869bf17475SGerrit Renker return -EINVAL; 6879bf17475SGerrit Renker len = sizeof(hctx->ccid3hctx_tfrc); 6889bf17475SGerrit Renker val = &hctx->ccid3hctx_tfrc; 6899bf17475SGerrit Renker break; 6909bf17475SGerrit Renker default: 6919bf17475SGerrit Renker return -ENOPROTOOPT; 6929bf17475SGerrit Renker } 6939bf17475SGerrit Renker 6949bf17475SGerrit Renker if (put_user(len, optlen) || copy_to_user(optval, val, len)) 6959bf17475SGerrit Renker return -EFAULT; 6969bf17475SGerrit Renker 6979bf17475SGerrit Renker return 0; 6989bf17475SGerrit Renker } 6999bf17475SGerrit Renker 7009bf17475SGerrit Renker /* 7019bf17475SGerrit Renker * Receiver Half-Connection Routines 7029bf17475SGerrit Renker */ 70356724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 7047c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 7057c657876SArnaldo Carvalho de Melo { 7067c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 7077c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 7087c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 7097c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 7107c657876SArnaldo Carvalho de Melo }; 7117c657876SArnaldo Carvalho de Melo 7127c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 7137c657876SArnaldo Carvalho de Melo } 7147c657876SArnaldo Carvalho de Melo #endif 7157c657876SArnaldo Carvalho de Melo 716c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 7171f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 7187c657876SArnaldo Carvalho de Melo { 71959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7207c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 7217c657876SArnaldo Carvalho de Melo 7227c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 7231f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 7241f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 7257c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 7267c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 7277c657876SArnaldo Carvalho de Melo } 7287c657876SArnaldo Carvalho de Melo 72978ad713dSGerrit Renker static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) 73078ad713dSGerrit Renker { 73178ad713dSGerrit Renker if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ 73278ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 73378ad713dSGerrit Renker else 73478ad713dSGerrit Renker hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : 73578ad713dSGerrit Renker (9 * hcrx->ccid3hcrx_s + len) / 10; 73678ad713dSGerrit Renker } 73778ad713dSGerrit Renker 7387c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 7397c657876SArnaldo Carvalho de Melo { 74059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7417c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 7428c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 743b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 7440f9e5b57SGerrit Renker suseconds_t delta; 7457c657876SArnaldo Carvalho de Melo 746a9672411SGerrit Renker ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk), sk); 7477c657876SArnaldo Carvalho de Melo 748b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 749b6ee3d4aSArnaldo Carvalho de Melo 7507c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 7517c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 7527c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 7537c657876SArnaldo Carvalho de Melo break; 7540f9e5b57SGerrit Renker case TFRC_RSTATE_DATA: 7550f9e5b57SGerrit Renker delta = timeval_delta(&now, 756b6ee3d4aSArnaldo Carvalho de Melo &hcrx->ccid3hcrx_tstamp_last_feedback); 7570f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 758b9039a2aSGerrit Renker hcrx->ccid3hcrx_x_recv = 759b9039a2aSGerrit Renker scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 7607c657876SArnaldo Carvalho de Melo break; 76159348b19SGerrit Renker case TFRC_RSTATE_TERM: 762a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 7637c657876SArnaldo Carvalho de Melo return; 7647c657876SArnaldo Carvalho de Melo } 7657c657876SArnaldo Carvalho de Melo 7668c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 76759d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 768a9672411SGerrit Renker DCCP_WARN("%s(%p), no data packet in history!\n", 76959348b19SGerrit Renker dccp_role(sk), sk); 7707c657876SArnaldo Carvalho de Melo return; 7717c657876SArnaldo Carvalho de Melo } 7727c657876SArnaldo Carvalho de Melo 773b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 77466a377c5SIan McDonald hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; 7757c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7767c657876SArnaldo Carvalho de Melo 7770f9e5b57SGerrit Renker /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */ 7780f9e5b57SGerrit Renker delta = timeval_delta(&now, &packet->dccphrx_tstamp); 7790f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 7800f9e5b57SGerrit Renker hcrx->ccid3hcrx_elapsed_time = delta / 10; 78145393a66SGerrit Renker 7827c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 78345393a66SGerrit Renker hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ 78445393a66SGerrit Renker else if (hcrx->ccid3hcrx_p > 1000000) { 78545393a66SGerrit Renker DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); 78645393a66SGerrit Renker hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ 78745393a66SGerrit Renker } else 7887c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 78945393a66SGerrit Renker 790507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7917c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7927c657876SArnaldo Carvalho de Melo } 7937c657876SArnaldo Carvalho de Melo 7942d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7957c657876SArnaldo Carvalho de Melo { 79659d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 79760fe62e7SAndrea Bittau __be32 x_recv, pinv; 7987c657876SArnaldo Carvalho de Melo 79959d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 80059d203f9SArnaldo Carvalho de Melo 80159d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 8022d0817d1SArnaldo Carvalho de Melo return 0; 8037c657876SArnaldo Carvalho de Melo 80466a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 8054fded33bSArnaldo Carvalho de Melo 8064fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 8072d0817d1SArnaldo Carvalho de Melo return 0; 8084fded33bSArnaldo Carvalho de Melo 8094fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 8104fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 8112d0817d1SArnaldo Carvalho de Melo 8122d0817d1SArnaldo Carvalho de Melo if ((hcrx->ccid3hcrx_elapsed_time != 0 && 8132d0817d1SArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 8142d0817d1SArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time)) || 8152d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb) || 8164fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 8172d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 8184fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 8192d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 8202d0817d1SArnaldo Carvalho de Melo return -1; 8212d0817d1SArnaldo Carvalho de Melo 8222d0817d1SArnaldo Carvalho de Melo return 0; 8237c657876SArnaldo Carvalho de Melo } 8247c657876SArnaldo Carvalho de Melo 8257c657876SArnaldo Carvalho de Melo /* calculate first loss interval 8267c657876SArnaldo Carvalho de Melo * 8277c657876SArnaldo Carvalho de Melo * returns estimated loss interval in usecs */ 8287c657876SArnaldo Carvalho de Melo 8297c657876SArnaldo Carvalho de Melo static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) 8307c657876SArnaldo Carvalho de Melo { 83159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 8328c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *entry, *next, *tail = NULL; 8330f9e5b57SGerrit Renker u32 x_recv, p; 8340f9e5b57SGerrit Renker suseconds_t rtt, delta; 835b6ee3d4aSArnaldo Carvalho de Melo struct timeval tstamp = { 0, }; 8367c657876SArnaldo Carvalho de Melo int interval = 0; 8377c657876SArnaldo Carvalho de Melo int win_count = 0; 8387c657876SArnaldo Carvalho de Melo int step = 0; 839bfe24a6cSGerrit Renker u64 fval; 8407c657876SArnaldo Carvalho de Melo 8418c60f3faSArnaldo Carvalho de Melo list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, 8428c60f3faSArnaldo Carvalho de Melo dccphrx_node) { 8438c60f3faSArnaldo Carvalho de Melo if (dccp_rx_hist_entry_data_packet(entry)) { 8447c657876SArnaldo Carvalho de Melo tail = entry; 8457c657876SArnaldo Carvalho de Melo 8467c657876SArnaldo Carvalho de Melo switch (step) { 8477c657876SArnaldo Carvalho de Melo case 0: 8488c60f3faSArnaldo Carvalho de Melo tstamp = entry->dccphrx_tstamp; 849c1734376SArnaldo Carvalho de Melo win_count = entry->dccphrx_ccval; 8507c657876SArnaldo Carvalho de Melo step = 1; 8517c657876SArnaldo Carvalho de Melo break; 8527c657876SArnaldo Carvalho de Melo case 1: 853c1734376SArnaldo Carvalho de Melo interval = win_count - entry->dccphrx_ccval; 8547c657876SArnaldo Carvalho de Melo if (interval < 0) 8557c657876SArnaldo Carvalho de Melo interval += TFRC_WIN_COUNT_LIMIT; 8567c657876SArnaldo Carvalho de Melo if (interval > 4) 8577c657876SArnaldo Carvalho de Melo goto found; 8587c657876SArnaldo Carvalho de Melo break; 8597c657876SArnaldo Carvalho de Melo } 8607c657876SArnaldo Carvalho de Melo } 8617c657876SArnaldo Carvalho de Melo } 8627c657876SArnaldo Carvalho de Melo 86359d203f9SArnaldo Carvalho de Melo if (unlikely(step == 0)) { 864a9672411SGerrit Renker DCCP_WARN("%s(%p), packet history has no data packets!\n", 86559348b19SGerrit Renker dccp_role(sk), sk); 8667c657876SArnaldo Carvalho de Melo return ~0; 8677c657876SArnaldo Carvalho de Melo } 8687c657876SArnaldo Carvalho de Melo 86959d203f9SArnaldo Carvalho de Melo if (unlikely(interval == 0)) { 870a9672411SGerrit Renker DCCP_WARN("%s(%p), Could not find a win_count interval > 0." 87159348b19SGerrit Renker "Defaulting to 1\n", dccp_role(sk), sk); 8727c657876SArnaldo Carvalho de Melo interval = 1; 8737c657876SArnaldo Carvalho de Melo } 8747c657876SArnaldo Carvalho de Melo found: 87566a377c5SIan McDonald if (!tail) { 87659348b19SGerrit Renker DCCP_CRIT("tail is null\n"); 87766a377c5SIan McDonald return ~0; 87866a377c5SIan McDonald } 8790f9e5b57SGerrit Renker 8800f9e5b57SGerrit Renker delta = timeval_delta(&tstamp, &tail->dccphrx_tstamp); 8810f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 8820f9e5b57SGerrit Renker 8830f9e5b57SGerrit Renker rtt = delta * 4 / interval; 8841fba78b6SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p), approximated RTT to %dus\n", 8851fba78b6SArnaldo Carvalho de Melo dccp_role(sk), sk, (int)rtt); 88659348b19SGerrit Renker 887bfe24a6cSGerrit Renker /* 888bfe24a6cSGerrit Renker * Determine the length of the first loss interval via inverse lookup. 889bfe24a6cSGerrit Renker * Assume that X_recv can be computed by the throughput equation 890bfe24a6cSGerrit Renker * s 891bfe24a6cSGerrit Renker * X_recv = -------- 892bfe24a6cSGerrit Renker * R * fval 893bfe24a6cSGerrit Renker * Find some p such that f(p) = fval; return 1/p [RFC 3448, 6.3.1]. 894bfe24a6cSGerrit Renker */ 895bfe24a6cSGerrit Renker if (rtt == 0) { /* would result in divide-by-zero */ 896832e3ca6SIan McDonald DCCP_WARN("RTT==0\n"); 897832e3ca6SIan McDonald return ~0; 89859348b19SGerrit Renker } 8997c657876SArnaldo Carvalho de Melo 900b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &tstamp); 901b0e56780SArnaldo Carvalho de Melo delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); 9020f9e5b57SGerrit Renker DCCP_BUG_ON(delta <= 0); 9037c657876SArnaldo Carvalho de Melo 9040f9e5b57SGerrit Renker x_recv = scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 905bfe24a6cSGerrit Renker if (x_recv == 0) { /* would also trigger divide-by-zero */ 906bfe24a6cSGerrit Renker DCCP_WARN("X_recv==0\n"); 907bfe24a6cSGerrit Renker if ((x_recv = hcrx->ccid3hcrx_x_recv) == 0) { 908bfe24a6cSGerrit Renker DCCP_BUG("stored value of X_recv is zero"); 909832e3ca6SIan McDonald return ~0; 910bfe24a6cSGerrit Renker } 91166a377c5SIan McDonald } 91266a377c5SIan McDonald 913bfe24a6cSGerrit Renker fval = scaled_div(hcrx->ccid3hcrx_s, rtt); 914bfe24a6cSGerrit Renker fval = scaled_div32(fval, x_recv); 91536729c1aSArnaldo Carvalho de Melo p = tfrc_calc_x_reverse_lookup(fval); 916bfe24a6cSGerrit Renker 917a9672411SGerrit Renker ccid3_pr_debug("%s(%p), receive rate=%u bytes/s, implied " 9181f2333aeSArnaldo Carvalho de Melo "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 9197c657876SArnaldo Carvalho de Melo 9207c657876SArnaldo Carvalho de Melo if (p == 0) 9217c657876SArnaldo Carvalho de Melo return ~0; 9227c657876SArnaldo Carvalho de Melo else 9237c657876SArnaldo Carvalho de Melo return 1000000 / p; 9247c657876SArnaldo Carvalho de Melo } 9257c657876SArnaldo Carvalho de Melo 9267c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) 9277c657876SArnaldo Carvalho de Melo { 92859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 929fc747e82SIan McDonald struct dccp_li_hist_entry *head; 93066a377c5SIan McDonald u64 seq_temp; 9317c657876SArnaldo Carvalho de Melo 93266a377c5SIan McDonald if (list_empty(&hcrx->ccid3hcrx_li_hist)) { 93366a377c5SIan McDonald if (!dccp_li_hist_interval_new(ccid3_li_hist, 93466a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) 935ae6706f0SArnaldo Carvalho de Melo return; 93666a377c5SIan McDonald 937fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 938fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 939fc747e82SIan McDonald head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); 94066a377c5SIan McDonald } else { 94166a377c5SIan McDonald struct dccp_li_hist_entry *entry; 94266a377c5SIan McDonald struct list_head *tail; 94366a377c5SIan McDonald 944fc747e82SIan McDonald head = list_entry(hcrx->ccid3hcrx_li_hist.next, 945fc747e82SIan McDonald struct dccp_li_hist_entry, dccplih_node); 94666a377c5SIan McDonald /* FIXME win count check removed as was wrong */ 94766a377c5SIan McDonald /* should make this check with receive history */ 94866a377c5SIan McDonald /* and compare there as per section 10.2 of RFC4342 */ 94966a377c5SIan McDonald 95066a377c5SIan McDonald /* new loss event detected */ 95166a377c5SIan McDonald /* calculate last interval length */ 95266a377c5SIan McDonald seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); 95354e6ecb2SChristoph Lameter entry = dccp_li_hist_entry_new(ccid3_li_hist, GFP_ATOMIC); 95466a377c5SIan McDonald 95566a377c5SIan McDonald if (entry == NULL) { 95659348b19SGerrit Renker DCCP_BUG("out of memory - can not allocate entry"); 95766a377c5SIan McDonald return; 9587c657876SArnaldo Carvalho de Melo } 9597c657876SArnaldo Carvalho de Melo 96066a377c5SIan McDonald list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); 96166a377c5SIan McDonald 96266a377c5SIan McDonald tail = hcrx->ccid3hcrx_li_hist.prev; 96366a377c5SIan McDonald list_del(tail); 96466a377c5SIan McDonald kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); 96566a377c5SIan McDonald 96666a377c5SIan McDonald /* Create the newest interval */ 96766a377c5SIan McDonald entry->dccplih_seqno = seq_loss; 96866a377c5SIan McDonald entry->dccplih_interval = seq_temp; 96966a377c5SIan McDonald entry->dccplih_win_count = win_loss; 97066a377c5SIan McDonald } 97166a377c5SIan McDonald } 97266a377c5SIan McDonald 97366a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 97466a377c5SIan McDonald struct dccp_rx_hist_entry *packet) 9757c657876SArnaldo Carvalho de Melo { 97659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9778109b02bSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *rx_hist = 9788109b02bSArnaldo Carvalho de Melo dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); 97966a377c5SIan McDonald u64 seqno = packet->dccphrx_seqno; 98066a377c5SIan McDonald u64 tmp_seqno; 98166a377c5SIan McDonald int loss = 0; 98266a377c5SIan McDonald u8 ccval; 9837c657876SArnaldo Carvalho de Melo 98466a377c5SIan McDonald 98566a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 98666a377c5SIan McDonald 98766a377c5SIan McDonald if (!rx_hist || 98866a377c5SIan McDonald follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 98966a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 99066a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 99166a377c5SIan McDonald goto detect_out; 99266a377c5SIan McDonald } 99366a377c5SIan McDonald 99466a377c5SIan McDonald 99566a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 99666a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 99766a377c5SIan McDonald loss = 1; 99866a377c5SIan McDonald ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, 99966a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 100066a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 100166a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 100266a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 100366a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 100466a377c5SIan McDonald while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 100566a377c5SIan McDonald tmp_seqno, &ccval)) { 100666a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 100766a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 100866a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 100966a377c5SIan McDonald } 101066a377c5SIan McDonald } 101166a377c5SIan McDonald 101266a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 101366a377c5SIan McDonald /* but works at moment */ 101466a377c5SIan McDonald if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 101566a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 101666a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 101766a377c5SIan McDonald } 101866a377c5SIan McDonald 101966a377c5SIan McDonald detect_out: 102066a377c5SIan McDonald dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 102166a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 102266a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 102366a377c5SIan McDonald return loss; 10247c657876SArnaldo Carvalho de Melo } 10257c657876SArnaldo Carvalho de Melo 10267c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 10277c657876SArnaldo Carvalho de Melo { 102859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 10294fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 10308c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 10317c657876SArnaldo Carvalho de Melo struct timeval now; 10320f9e5b57SGerrit Renker u32 p_prev, rtt_prev; 10330f9e5b57SGerrit Renker suseconds_t r_sample, t_elapsed; 103478ad713dSGerrit Renker int loss, payload_size; 10351f2333aeSArnaldo Carvalho de Melo 103659348b19SGerrit Renker BUG_ON(hcrx == NULL); 10377c657876SArnaldo Carvalho de Melo 103859725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 10394fded33bSArnaldo Carvalho de Melo 10407c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 10417c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 10427c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 10437c657876SArnaldo Carvalho de Melo return; 10447c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 10454fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 10467c657876SArnaldo Carvalho de Melo break; 104766a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 1048b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 1049b3a3077dSArnaldo Carvalho de Melo timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); 1050b3a3077dSArnaldo Carvalho de Melo r_sample = timeval_usecs(&now); 1051b3a3077dSArnaldo Carvalho de Melo t_elapsed = opt_recv->dccpor_elapsed_time * 10; 1052b3a3077dSArnaldo Carvalho de Melo 10530f9e5b57SGerrit Renker DCCP_BUG_ON(r_sample < 0); 1054b3a3077dSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 10550f9e5b57SGerrit Renker DCCP_WARN("r_sample=%ldus, t_elapsed=%ldus\n", 10560f08461eSAndrew Morton (long)r_sample, (long)t_elapsed); 1057b3a3077dSArnaldo Carvalho de Melo else 1058b3a3077dSArnaldo Carvalho de Melo r_sample -= t_elapsed; 1059de553c18SGerrit Renker CCID3_RTT_SANITY_CHECK(r_sample); 1060b3a3077dSArnaldo Carvalho de Melo 1061b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 1062b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 1063b3a3077dSArnaldo Carvalho de Melo else 1064b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 1065b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 1066b3a3077dSArnaldo Carvalho de Melo 106766a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 1068a9672411SGerrit Renker ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n", 1069a9672411SGerrit Renker dccp_role(sk), sk, hcrx->ccid3hcrx_rtt, 10704fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 10717c657876SArnaldo Carvalho de Melo break; 10727c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 10737c657876SArnaldo Carvalho de Melo break; 107459d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 10757c657876SArnaldo Carvalho de Melo return; 10767c657876SArnaldo Carvalho de Melo } 10777c657876SArnaldo Carvalho de Melo 1078b0e56780SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, 107954e6ecb2SChristoph Lameter skb, GFP_ATOMIC); 108059d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 1081a9672411SGerrit Renker DCCP_WARN("%s(%p), Not enough mem to add rx packet " 108259348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 10837c657876SArnaldo Carvalho de Melo return; 10847c657876SArnaldo Carvalho de Melo } 10857c657876SArnaldo Carvalho de Melo 108666a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 10877c657876SArnaldo Carvalho de Melo 10887c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 10897c657876SArnaldo Carvalho de Melo return; 10907c657876SArnaldo Carvalho de Melo 109178ad713dSGerrit Renker payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; 109278ad713dSGerrit Renker ccid3_hc_rx_update_s(hcrx, payload_size); 109378ad713dSGerrit Renker 10947c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 10957c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 1096a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial " 1097a9672411SGerrit Renker "feedback\n", dccp_role(sk), sk, 10981f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 10997c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 11007c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 11017c657876SArnaldo Carvalho de Melo return; 11027c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 110378ad713dSGerrit Renker hcrx->ccid3hcrx_bytes_recv += payload_size; 110466a377c5SIan McDonald if (loss) 1105b6ee3d4aSArnaldo Carvalho de Melo break; 1106b6ee3d4aSArnaldo Carvalho de Melo 1107b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 11088109b02bSArnaldo Carvalho de Melo if ((timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) - 11098109b02bSArnaldo Carvalho de Melo (suseconds_t)hcrx->ccid3hcrx_rtt) >= 0) { 1110b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 11117c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 11127c657876SArnaldo Carvalho de Melo } 11137c657876SArnaldo Carvalho de Melo return; 111459348b19SGerrit Renker case TFRC_RSTATE_TERM: 1115a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 11167c657876SArnaldo Carvalho de Melo return; 11177c657876SArnaldo Carvalho de Melo } 11187c657876SArnaldo Carvalho de Melo 11197c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 1120a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n", 11214fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 11227c657876SArnaldo Carvalho de Melo 11237c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 11247c657876SArnaldo Carvalho de Melo 11257c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 1126c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 1127c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 1128c0996660SIan McDonald 11297c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 1130c0996660SIan McDonald if (i_mean != 0) 1131c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 113259348b19SGerrit Renker } else 113359348b19SGerrit Renker DCCP_BUG("empty loss history"); 11347c657876SArnaldo Carvalho de Melo 11357c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 11367c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 11377c657876SArnaldo Carvalho de Melo return; 11387c657876SArnaldo Carvalho de Melo } 11397c657876SArnaldo Carvalho de Melo } 11407c657876SArnaldo Carvalho de Melo 114191f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 11427c657876SArnaldo Carvalho de Melo { 114391f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 11447c657876SArnaldo Carvalho de Melo 1145a9672411SGerrit Renker ccid3_pr_debug("entry\n"); 11467c657876SArnaldo Carvalho de Melo 11477c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 11487c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 1149ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 1150b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); 1151954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; 115278ad713dSGerrit Renker hcrx->ccid3hcrx_s = 0; 1153fe0499aeSGerrit Renker hcrx->ccid3hcrx_rtt = 0; 11547c657876SArnaldo Carvalho de Melo return 0; 11557c657876SArnaldo Carvalho de Melo } 11567c657876SArnaldo Carvalho de Melo 11577c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 11587c657876SArnaldo Carvalho de Melo { 115959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 11607c657876SArnaldo Carvalho de Melo 116159d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 11627c657876SArnaldo Carvalho de Melo 11637c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 11647c657876SArnaldo Carvalho de Melo 11657c657876SArnaldo Carvalho de Melo /* Empty packet history */ 11668c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 11677c657876SArnaldo Carvalho de Melo 11687c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 1169ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); 11707c657876SArnaldo Carvalho de Melo } 11717c657876SArnaldo Carvalho de Melo 11722babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 11732babe1f6SArnaldo Carvalho de Melo { 117459725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 11752babe1f6SArnaldo Carvalho de Melo 117659c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 117759c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 117859c2353dSArnaldo Carvalho de Melo return; 117959c2353dSArnaldo Carvalho de Melo 118059d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 11812babe1f6SArnaldo Carvalho de Melo 11822babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 11832babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 11842babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 11852babe1f6SArnaldo Carvalho de Melo } 11862babe1f6SArnaldo Carvalho de Melo 118788f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 118888f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 118988f964dbSArnaldo Carvalho de Melo { 119088f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 119188f964dbSArnaldo Carvalho de Melo const void *val; 119288f964dbSArnaldo Carvalho de Melo 119388f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 119488f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 119588f964dbSArnaldo Carvalho de Melo return -EINVAL; 119688f964dbSArnaldo Carvalho de Melo 119788f964dbSArnaldo Carvalho de Melo switch (optname) { 119888f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 119988f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 120088f964dbSArnaldo Carvalho de Melo return -EINVAL; 120188f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 120288f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 120388f964dbSArnaldo Carvalho de Melo break; 120488f964dbSArnaldo Carvalho de Melo default: 120588f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 120688f964dbSArnaldo Carvalho de Melo } 120788f964dbSArnaldo Carvalho de Melo 120888f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 120988f964dbSArnaldo Carvalho de Melo return -EFAULT; 121088f964dbSArnaldo Carvalho de Melo 121188f964dbSArnaldo Carvalho de Melo return 0; 121288f964dbSArnaldo Carvalho de Melo } 121388f964dbSArnaldo Carvalho de Melo 121491f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 12153dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 12167c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 12177c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 121891f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 12197c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 12207c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 12217c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 12227c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 12237c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 12247c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 122591f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 12267c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 12277c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 12287c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 12297c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 12302babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 12312babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 123288f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 123388f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 12347c657876SArnaldo Carvalho de Melo }; 12357c657876SArnaldo Carvalho de Melo 123656724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 12377c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 12387c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 123956724aa4SGerrit Renker #endif 12407c657876SArnaldo Carvalho de Melo 12417c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 12427c657876SArnaldo Carvalho de Melo { 12438c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 12447c657876SArnaldo Carvalho de Melo 12458c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 12468c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 12477c657876SArnaldo Carvalho de Melo goto out; 12487c657876SArnaldo Carvalho de Melo 12498c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 12508c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 12518c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 12527c657876SArnaldo Carvalho de Melo 1253ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = dccp_li_hist_new("ccid3"); 1254ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist == NULL) 12558c60f3faSArnaldo Carvalho de Melo goto out_free_tx; 12567c657876SArnaldo Carvalho de Melo 12577c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 12587c657876SArnaldo Carvalho de Melo if (rc != 0) 12597c657876SArnaldo Carvalho de Melo goto out_free_loss_interval_history; 12607c657876SArnaldo Carvalho de Melo out: 12617c657876SArnaldo Carvalho de Melo return rc; 12628c60f3faSArnaldo Carvalho de Melo 12637c657876SArnaldo Carvalho de Melo out_free_loss_interval_history: 1264ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1265ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12668c60f3faSArnaldo Carvalho de Melo out_free_tx: 12678c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12688c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12698c60f3faSArnaldo Carvalho de Melo out_free_rx: 12708c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12718c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12727c657876SArnaldo Carvalho de Melo goto out; 12737c657876SArnaldo Carvalho de Melo } 12747c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 12757c657876SArnaldo Carvalho de Melo 12767c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 12777c657876SArnaldo Carvalho de Melo { 12787c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 12797c657876SArnaldo Carvalho de Melo 12808c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 12818c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12828c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12837c657876SArnaldo Carvalho de Melo } 12848c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 12858c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12868c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12877c657876SArnaldo Carvalho de Melo } 1288ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist != NULL) { 1289ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1290ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12917c657876SArnaldo Carvalho de Melo } 12927c657876SArnaldo Carvalho de Melo } 12937c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 12947c657876SArnaldo Carvalho de Melo 1295e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 12961f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 12977c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 12987c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 12997c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1300