17c657876SArnaldo Carvalho de Melo /* 27c657876SArnaldo Carvalho de Melo * net/dccp/ccids/ccid3.c 37c657876SArnaldo Carvalho de Melo * 4954c2db8SGerrit Renker * Copyright (c) 2007 The University of Aberdeen, Scotland, UK 5b2f41ff4SIan McDonald * Copyright (c) 2005-7 The University of Waikato, Hamilton, New Zealand. 6b2f41ff4SIan McDonald * Copyright (c) 2005-7 Ian McDonald <ian.mcdonald@jandi.co.nz> 77c657876SArnaldo Carvalho de Melo * 87c657876SArnaldo Carvalho de Melo * An implementation of the DCCP protocol 97c657876SArnaldo Carvalho de Melo * 107c657876SArnaldo Carvalho de Melo * This code has been developed by the University of Waikato WAND 117c657876SArnaldo Carvalho de Melo * research group. For further information please see http://www.wand.net.nz/ 127c657876SArnaldo Carvalho de Melo * 137c657876SArnaldo Carvalho de Melo * This code also uses code from Lulea University, rereleased as GPL by its 147c657876SArnaldo Carvalho de Melo * authors: 157c657876SArnaldo Carvalho de Melo * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon 167c657876SArnaldo Carvalho de Melo * 177c657876SArnaldo Carvalho de Melo * Changes to meet Linux coding standards, to make it meet latest ccid3 draft 187c657876SArnaldo Carvalho de Melo * and to make it work as a loadable module in the DCCP stack written by 197c657876SArnaldo Carvalho de Melo * Arnaldo Carvalho de Melo <acme@conectiva.com.br>. 207c657876SArnaldo Carvalho de Melo * 217c657876SArnaldo Carvalho de Melo * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> 227c657876SArnaldo Carvalho de Melo * 237c657876SArnaldo Carvalho de Melo * This program is free software; you can redistribute it and/or modify 247c657876SArnaldo Carvalho de Melo * it under the terms of the GNU General Public License as published by 257c657876SArnaldo Carvalho de Melo * the Free Software Foundation; either version 2 of the License, or 267c657876SArnaldo Carvalho de Melo * (at your option) any later version. 277c657876SArnaldo Carvalho de Melo * 287c657876SArnaldo Carvalho de Melo * This program is distributed in the hope that it will be useful, 297c657876SArnaldo Carvalho de Melo * but WITHOUT ANY WARRANTY; without even the implied warranty of 307c657876SArnaldo Carvalho de Melo * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 317c657876SArnaldo Carvalho de Melo * GNU General Public License for more details. 327c657876SArnaldo Carvalho de Melo * 337c657876SArnaldo Carvalho de Melo * You should have received a copy of the GNU General Public License 347c657876SArnaldo Carvalho de Melo * along with this program; if not, write to the Free Software 357c657876SArnaldo Carvalho de Melo * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 367c657876SArnaldo Carvalho de Melo */ 377c657876SArnaldo Carvalho de Melo #include "../dccp.h" 387c657876SArnaldo Carvalho de Melo #include "ccid3.h" 397c657876SArnaldo Carvalho de Melo 4076fd1e87SGerrit Renker #include <asm/unaligned.h> 4176fd1e87SGerrit Renker 4256724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 4356724aa4SGerrit Renker static int ccid3_debug; 4456724aa4SGerrit Renker #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) 457c657876SArnaldo Carvalho de Melo #else 467c657876SArnaldo Carvalho de Melo #define ccid3_pr_debug(format, a...) 477c657876SArnaldo Carvalho de Melo #endif 487c657876SArnaldo Carvalho de Melo 499bf17475SGerrit Renker /* 509bf17475SGerrit Renker * Transmitter Half-Connection Routines 519bf17475SGerrit Renker */ 5256724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 537c657876SArnaldo Carvalho de Melo static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) 547c657876SArnaldo Carvalho de Melo { 557c657876SArnaldo Carvalho de Melo static char *ccid3_state_names[] = { 567c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_SENT] = "NO_SENT", 577c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", 587c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_FBACK] = "FBACK", 597c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_TERM] = "TERM", 607c657876SArnaldo Carvalho de Melo }; 617c657876SArnaldo Carvalho de Melo 627c657876SArnaldo Carvalho de Melo return ccid3_state_names[state]; 637c657876SArnaldo Carvalho de Melo } 647c657876SArnaldo Carvalho de Melo #endif 657c657876SArnaldo Carvalho de Melo 66c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_tx_set_state(struct sock *sk, 671f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_tx_states state) 687c657876SArnaldo Carvalho de Melo { 6959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 707c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; 717c657876SArnaldo Carvalho de Melo 727c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 731f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_tx_state_name(oldstate), 741f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(state)); 757c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 767c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = state; 777c657876SArnaldo Carvalho de Melo } 787c657876SArnaldo Carvalho de Melo 7917893bc1SGerrit Renker /* 806c08b2cfSGerrit Renker * Compute the initial sending rate X_init in the manner of RFC 3390: 816c08b2cfSGerrit Renker * 826c08b2cfSGerrit Renker * X_init = min(4 * s, max(2 * s, 4380 bytes)) / RTT 836c08b2cfSGerrit Renker * 846c08b2cfSGerrit Renker * Note that RFC 3390 uses MSS, RFC 4342 refers to RFC 3390, and rfc3448bis 856c08b2cfSGerrit Renker * (rev-02) clarifies the use of RFC 3390 with regard to the above formula. 86a21f9f96SGerrit Renker * For consistency with other parts of the code, X_init is scaled by 2^6. 87a21f9f96SGerrit Renker */ 88a21f9f96SGerrit Renker static inline u64 rfc3390_initial_rate(struct sock *sk) 89a21f9f96SGerrit Renker { 906c08b2cfSGerrit Renker const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 916c08b2cfSGerrit Renker const __u32 w_init = min_t(__u32, 4 * hctx->ccid3hctx_s, 926c08b2cfSGerrit Renker max_t(__u32, 2 * hctx->ccid3hctx_s, 4380)); 93a21f9f96SGerrit Renker 946c08b2cfSGerrit Renker return scaled_div(w_init << 6, hctx->ccid3hctx_rtt); 95a21f9f96SGerrit Renker } 96a21f9f96SGerrit Renker 97a21f9f96SGerrit Renker /* 981266adeeSGerrit Renker * Recalculate t_ipi and delta (should be called whenever X changes) 9917893bc1SGerrit Renker */ 1001266adeeSGerrit Renker static inline void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hctx) 1017c657876SArnaldo Carvalho de Melo { 1021a21e49aSGerrit Renker /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */ 103b2449fdcSGerrit Renker hctx->ccid3hctx_t_ipi = scaled_div32(((u64)hctx->ccid3hctx_s) << 6, 104b2449fdcSGerrit Renker hctx->ccid3hctx_x); 10517893bc1SGerrit Renker 1067c657876SArnaldo Carvalho de Melo /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ 1071f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, 1081f2333aeSArnaldo Carvalho de Melo TFRC_OPSYS_HALF_TIME_GRAN); 1098699be7dSIan McDonald 1101761f7d7SGerrit Renker ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n", 1118699be7dSIan McDonald hctx->ccid3hctx_t_ipi, hctx->ccid3hctx_delta, 1121761f7d7SGerrit Renker hctx->ccid3hctx_s, (unsigned)(hctx->ccid3hctx_x >> 6)); 1138699be7dSIan McDonald 1147c657876SArnaldo Carvalho de Melo } 115aa97efd9SGerrit Renker 116a5358fdcSGerrit Renker static u32 ccid3_hc_tx_idle_rtt(struct ccid3_hc_tx_sock *hctx, ktime_t now) 117a5358fdcSGerrit Renker { 118a5358fdcSGerrit Renker u32 delta = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count); 119a5358fdcSGerrit Renker 120a5358fdcSGerrit Renker return delta / hctx->ccid3hctx_rtt; 121a5358fdcSGerrit Renker } 122a5358fdcSGerrit Renker 123aa97efd9SGerrit Renker /** 124aa97efd9SGerrit Renker * ccid3_hc_tx_update_x - Update allowed sending rate X 125aa97efd9SGerrit Renker * @stamp: most recent time if available - can be left NULL. 126aa97efd9SGerrit Renker * This function tracks draft rfc3448bis, check there for latest details. 1275c3fbb6aSGerrit Renker * 1281a21e49aSGerrit Renker * Note: X and X_recv are both stored in units of 64 * bytes/second, to support 1291a21e49aSGerrit Renker * fine-grained resolution of sending rates. This requires scaling by 2^6 1301a21e49aSGerrit Renker * throughout the code. Only X_calc is unscaled (in bytes/second). 1311a21e49aSGerrit Renker * 1327c657876SArnaldo Carvalho de Melo */ 133aa97efd9SGerrit Renker static void ccid3_hc_tx_update_x(struct sock *sk, ktime_t *stamp) 134a79ef76fSGerrit Renker 1357c657876SArnaldo Carvalho de Melo { 13659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1370c150efbSGerrit Renker __u64 min_rate = 2 * hctx->ccid3hctx_x_recv; 1381a21e49aSGerrit Renker const __u64 old_x = hctx->ccid3hctx_x; 139aa97efd9SGerrit Renker ktime_t now = stamp? *stamp : ktime_get_real(); 1407c657876SArnaldo Carvalho de Melo 1410c150efbSGerrit Renker /* 1420c150efbSGerrit Renker * Handle IDLE periods: do not reduce below RFC3390 initial sending rate 143a5358fdcSGerrit Renker * when idling [RFC 4342, 5.1]. Definition of idling is from rfc3448bis: 144a5358fdcSGerrit Renker * a sender is idle if it has not sent anything over a 2-RTT-period. 1450c150efbSGerrit Renker * For consistency with X and X_recv, min_rate is also scaled by 2^6. 1460c150efbSGerrit Renker */ 147a5358fdcSGerrit Renker if (ccid3_hc_tx_idle_rtt(hctx, now) >= 2) { 1480c150efbSGerrit Renker min_rate = rfc3390_initial_rate(sk); 1490c150efbSGerrit Renker min_rate = max(min_rate, 2 * hctx->ccid3hctx_x_recv); 1500c150efbSGerrit Renker } 1510c150efbSGerrit Renker 15244158306SGerrit Renker if (hctx->ccid3hctx_p > 0) { 1531a21e49aSGerrit Renker 1549e8efc82SGerrit Renker hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6, 1550c150efbSGerrit Renker min_rate); 1569e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, 1579e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 1589e8efc82SGerrit Renker TFRC_T_MBI); 159b6ee3d4aSArnaldo Carvalho de Melo 160aa97efd9SGerrit Renker } else if (ktime_us_delta(now, hctx->ccid3hctx_t_ld) 161aa97efd9SGerrit Renker - (s64)hctx->ccid3hctx_rtt >= 0) { 1621a21e49aSGerrit Renker 1639e8efc82SGerrit Renker hctx->ccid3hctx_x = 1640c150efbSGerrit Renker max(min(2 * hctx->ccid3hctx_x, min_rate), 1659e8efc82SGerrit Renker scaled_div(((__u64)hctx->ccid3hctx_s) << 6, 1666b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 167ac198ea8SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 168ac198ea8SArnaldo Carvalho de Melo } 169a79ef76fSGerrit Renker 1708699be7dSIan McDonald if (hctx->ccid3hctx_x != old_x) { 1711761f7d7SGerrit Renker ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, " 1721761f7d7SGerrit Renker "X_recv=%u\n", (unsigned)(old_x >> 6), 1731761f7d7SGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6), 1741761f7d7SGerrit Renker hctx->ccid3hctx_x_calc, 1751761f7d7SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6)); 1768699be7dSIan McDonald 1771266adeeSGerrit Renker ccid3_update_send_interval(hctx); 1787c657876SArnaldo Carvalho de Melo } 1798699be7dSIan McDonald } 1807c657876SArnaldo Carvalho de Melo 18178ad713dSGerrit Renker /* 18278ad713dSGerrit Renker * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) 18378ad713dSGerrit Renker * @len: DCCP packet payload size in bytes 18478ad713dSGerrit Renker */ 18578ad713dSGerrit Renker static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) 18678ad713dSGerrit Renker { 1871266adeeSGerrit Renker const u16 old_s = hctx->ccid3hctx_s; 1881266adeeSGerrit Renker 189c3ada46aSGerrit Renker hctx->ccid3hctx_s = tfrc_ewma(hctx->ccid3hctx_s, len, 9); 1901266adeeSGerrit Renker 1911266adeeSGerrit Renker if (hctx->ccid3hctx_s != old_s) 1921266adeeSGerrit Renker ccid3_update_send_interval(hctx); 19378ad713dSGerrit Renker } 19478ad713dSGerrit Renker 1959f8681dbSGerrit Renker /* 1969f8681dbSGerrit Renker * Update Window Counter using the algorithm from [RFC 4342, 8.1]. 1979f8681dbSGerrit Renker * The algorithm is not applicable if RTT < 4 microseconds. 1989f8681dbSGerrit Renker */ 1999f8681dbSGerrit Renker static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, 2008132da4dSGerrit Renker ktime_t now) 2019f8681dbSGerrit Renker { 2029f8681dbSGerrit Renker u32 quarter_rtts; 2039f8681dbSGerrit Renker 2049f8681dbSGerrit Renker if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ 2059f8681dbSGerrit Renker return; 2069f8681dbSGerrit Renker 2078132da4dSGerrit Renker quarter_rtts = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count); 2088132da4dSGerrit Renker quarter_rtts /= hctx->ccid3hctx_rtt / 4; 2099f8681dbSGerrit Renker 2109f8681dbSGerrit Renker if (quarter_rtts > 0) { 2118132da4dSGerrit Renker hctx->ccid3hctx_t_last_win_count = now; 2129f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); 2139f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ 2149f8681dbSGerrit Renker } 2159f8681dbSGerrit Renker } 2169f8681dbSGerrit Renker 2177c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 2187c657876SArnaldo Carvalho de Melo { 2197c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 22059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2212a1fda6fSGerrit Renker unsigned long t_nfb = USEC_PER_SEC / 5; 2227c657876SArnaldo Carvalho de Melo 2237c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 2247c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 2257c657876SArnaldo Carvalho de Melo /* Try again later. */ 2267c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 22748e03eeeSGerrit Renker goto restart_timer; 2287c657876SArnaldo Carvalho de Melo } 2297c657876SArnaldo Carvalho de Melo 230a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk, 2317c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2327c657876SArnaldo Carvalho de Melo 2337c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 2347c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 235a79ef76fSGerrit Renker /* RFC 3448, 4.4: Halve send rate directly */ 2369e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2, 2379e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2389e8efc82SGerrit Renker TFRC_T_MBI); 2397c657876SArnaldo Carvalho de Melo 240a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u " 241a9672411SGerrit Renker "bytes/s\n", dccp_role(sk), sk, 2421f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 2431a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 24448e03eeeSGerrit Renker /* The value of R is still undefined and so we can not recompute 2455e8e034cSJoe Perches * the timeout value. Keep initial value as per [RFC 4342, 5]. */ 2462a1fda6fSGerrit Renker t_nfb = TFRC_INITIAL_TIMEOUT; 2471266adeeSGerrit Renker ccid3_update_send_interval(hctx); 2487c657876SArnaldo Carvalho de Melo break; 2497c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 2501f2333aeSArnaldo Carvalho de Melo /* 251ff586298SGerrit Renker * Modify the cached value of X_recv [RFC 3448, 4.4] 252ff586298SGerrit Renker * 253ff586298SGerrit Renker * If (p == 0 || X_calc > 2 * X_recv) 2547c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2557c657876SArnaldo Carvalho de Melo * Else 2567c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2571a21e49aSGerrit Renker * 2581a21e49aSGerrit Renker * Note that X_recv is scaled by 2^6 while X_calc is not 2597c657876SArnaldo Carvalho de Melo */ 26044158306SGerrit Renker BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); 2617c657876SArnaldo Carvalho de Melo 26244158306SGerrit Renker if (hctx->ccid3hctx_p == 0 || 2630c150efbSGerrit Renker (hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5))) { 2641a21e49aSGerrit Renker 2651a21e49aSGerrit Renker hctx->ccid3hctx_x_recv = 2669e8efc82SGerrit Renker max(hctx->ccid3hctx_x_recv / 2, 2679e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2681a21e49aSGerrit Renker (2 * TFRC_T_MBI)); 2699e8efc82SGerrit Renker } else { 2709e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc; 2719e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 4; 2729e8efc82SGerrit Renker } 273ff586298SGerrit Renker /* Now recalculate X [RFC 3448, 4.3, step (4)] */ 274aa97efd9SGerrit Renker ccid3_hc_tx_update_x(sk, NULL); 2756b5e633aSArnaldo Carvalho de Melo /* 2766b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2778a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 2788a508ac2SGerrit Renker * See comments in packet_recv() regarding the value of t_RTO. 2796b5e633aSArnaldo Carvalho de Melo */ 2808a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 2817c657876SArnaldo Carvalho de Melo break; 28259348b19SGerrit Renker case TFRC_SSTATE_NO_SENT: 283a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk), sk); 28459348b19SGerrit Renker /* fall through */ 28559348b19SGerrit Renker case TFRC_SSTATE_TERM: 2867c657876SArnaldo Carvalho de Melo goto out; 2877c657876SArnaldo Carvalho de Melo } 2887c657876SArnaldo Carvalho de Melo 28948e03eeeSGerrit Renker restart_timer: 29048e03eeeSGerrit Renker sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2912a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 2927c657876SArnaldo Carvalho de Melo out: 2937c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2947c657876SArnaldo Carvalho de Melo sock_put(sk); 2957c657876SArnaldo Carvalho de Melo } 2967c657876SArnaldo Carvalho de Melo 2977da7f456SGerrit Renker /* 2987da7f456SGerrit Renker * returns 2997da7f456SGerrit Renker * > 0: delay (in msecs) that should pass before actually sending 3007da7f456SGerrit Renker * = 0: can send immediately 3017da7f456SGerrit Renker * < 0: error condition; do not send packet 3027da7f456SGerrit Renker */ 3036b57c93dSGerrit Renker static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) 3047c657876SArnaldo Carvalho de Melo { 3057c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 30659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3078132da4dSGerrit Renker ktime_t now = ktime_get_real(); 3088132da4dSGerrit Renker s64 delay; 3097c657876SArnaldo Carvalho de Melo 3107c657876SArnaldo Carvalho de Melo /* 311da335bafSGerrit Renker * This function is called only for Data and DataAck packets. Sending 312da335bafSGerrit Renker * zero-sized Data(Ack)s is theoretically possible, but for congestion 313da335bafSGerrit Renker * control this case is pathological - ignore it. 3147c657876SArnaldo Carvalho de Melo */ 3156b57c93dSGerrit Renker if (unlikely(skb->len == 0)) 316da335bafSGerrit Renker return -EBADMSG; 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; 32590feeb95SGerrit Renker 32690feeb95SGerrit Renker /* Set t_0 for initial packet */ 3277c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 32830833ffeSGerrit Renker 32930833ffeSGerrit Renker hctx->ccid3hctx_s = skb->len; 33030833ffeSGerrit Renker 33130833ffeSGerrit Renker /* 33230833ffeSGerrit Renker * Use initial RTT sample when available: recommended by erratum 33330833ffeSGerrit Renker * to RFC 4342. This implements the initialisation procedure of 33430833ffeSGerrit Renker * draft rfc3448bis, section 4.2. Remember, X is scaled by 2^6. 33530833ffeSGerrit Renker */ 33630833ffeSGerrit Renker if (dp->dccps_syn_rtt) { 33730833ffeSGerrit Renker ccid3_pr_debug("SYN RTT = %uus\n", dp->dccps_syn_rtt); 33830833ffeSGerrit Renker hctx->ccid3hctx_rtt = dp->dccps_syn_rtt; 33930833ffeSGerrit Renker hctx->ccid3hctx_x = rfc3390_initial_rate(sk); 34023f062afSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 34130833ffeSGerrit Renker } else { 3426c08b2cfSGerrit Renker /* Sender does not have RTT sample: X_pps = 1 pkt/sec */ 3436c08b2cfSGerrit Renker hctx->ccid3hctx_x = hctx->ccid3hctx_s; 34430833ffeSGerrit Renker hctx->ccid3hctx_x <<= 6; 34530833ffeSGerrit Renker } 34630833ffeSGerrit Renker ccid3_update_send_interval(hctx); 34730833ffeSGerrit Renker 34830833ffeSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3497c657876SArnaldo Carvalho de Melo break; 3507c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3517c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 3528132da4dSGerrit Renker delay = ktime_us_delta(hctx->ccid3hctx_t_nom, now); 3538699be7dSIan McDonald ccid3_pr_debug("delay=%ld\n", (long)delay); 35491cf5a17SGerrit Renker /* 35591cf5a17SGerrit Renker * Scheduling of packet transmissions [RFC 3448, 4.6] 35691cf5a17SGerrit Renker * 35791cf5a17SGerrit Renker * if (t_now > t_nom - delta) 35891cf5a17SGerrit Renker * // send the packet now 35991cf5a17SGerrit Renker * else 36091cf5a17SGerrit Renker * // send the packet in (t_nom - t_now) milliseconds. 36191cf5a17SGerrit Renker */ 36249d66a70SGerrit Renker if (delay - (s64)hctx->ccid3hctx_delta >= 1000) 3638132da4dSGerrit Renker return (u32)delay / 1000L; 3649f8681dbSGerrit Renker 3658132da4dSGerrit Renker ccid3_hc_tx_update_win_count(hctx, now); 3667c657876SArnaldo Carvalho de Melo break; 36759348b19SGerrit Renker case TFRC_SSTATE_TERM: 368a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 3697da7f456SGerrit Renker return -EINVAL; 3707c657876SArnaldo Carvalho de Melo } 3717c657876SArnaldo Carvalho de Melo 3727da7f456SGerrit Renker /* prepare to send now (add options etc.) */ 373507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 374e312d100SGerrit Renker DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 375e312d100SGerrit Renker 376e312d100SGerrit Renker /* set the nominal send time for the next following packet */ 3778132da4dSGerrit Renker hctx->ccid3hctx_t_nom = ktime_add_us(hctx->ccid3hctx_t_nom, 3788132da4dSGerrit Renker hctx->ccid3hctx_t_ipi); 3797da7f456SGerrit Renker return 0; 3807c657876SArnaldo Carvalho de Melo } 3817c657876SArnaldo Carvalho de Melo 3828109b02bSArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, 3838109b02bSArnaldo Carvalho de Melo unsigned int len) 3847c657876SArnaldo Carvalho de Melo { 38559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3867c657876SArnaldo Carvalho de Melo 38778ad713dSGerrit Renker ccid3_hc_tx_update_s(hctx, len); 38878ad713dSGerrit Renker 389276f2edcSArnaldo Carvalho de Melo if (tfrc_tx_hist_add(&hctx->ccid3hctx_hist, dccp_sk(sk)->dccps_gss)) 390c5a1ae9aSGerrit Renker DCCP_CRIT("packet history - out of memory!"); 3917c657876SArnaldo Carvalho de Melo } 3927c657876SArnaldo Carvalho de Melo 3937c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 3947c657876SArnaldo Carvalho de Melo { 39559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3967c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 3970740d49cSArnaldo Carvalho de Melo ktime_t now; 3982a1fda6fSGerrit Renker unsigned long t_nfb; 3997dfee1a9SGerrit Renker u32 pinv, r_sample; 4001f2333aeSArnaldo Carvalho de Melo 4017c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4027c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4037c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4047c657876SArnaldo Carvalho de Melo return; 4057c657876SArnaldo Carvalho de Melo 4067c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4077c657876SArnaldo Carvalho de Melo 4087c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4097c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4107c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4119108d5f4SArnaldo Carvalho de Melo now = ktime_get_real(); 4129108d5f4SArnaldo Carvalho de Melo 413276f2edcSArnaldo Carvalho de Melo /* estimate RTT from history if ACK number is valid */ 4149108d5f4SArnaldo Carvalho de Melo r_sample = tfrc_tx_hist_rtt(hctx->ccid3hctx_hist, 4159108d5f4SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq, now); 4169108d5f4SArnaldo Carvalho de Melo if (r_sample == 0) { 417276f2edcSArnaldo Carvalho de Melo DCCP_WARN("%s(%p): %s with bogus ACK-%llu\n", dccp_role(sk), sk, 418276f2edcSArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type), 419276f2edcSArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq); 4207c657876SArnaldo Carvalho de Melo return; 4217c657876SArnaldo Carvalho de Melo } 4227c657876SArnaldo Carvalho de Melo 4231a21e49aSGerrit Renker /* Update receive rate in units of 64 * bytes/second */ 4249e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; 4259e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 6; 4265c3fbb6aSGerrit Renker 4275c3fbb6aSGerrit Renker /* Update loss event rate */ 4285c3fbb6aSGerrit Renker pinv = opt_recv->ccid3or_loss_event_rate; 42945393a66SGerrit Renker if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ 4305c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 0; 43145393a66SGerrit Renker else /* can not exceed 100% */ 4325c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 1000000 / pinv; 4335c3fbb6aSGerrit Renker /* 4349108d5f4SArnaldo Carvalho de Melo * Validate new RTT sample and update moving average 4355c3fbb6aSGerrit Renker */ 4369108d5f4SArnaldo Carvalho de Melo r_sample = dccp_sample_rtt(sk, r_sample); 437c3ada46aSGerrit Renker hctx->ccid3hctx_rtt = tfrc_ewma(hctx->ccid3hctx_rtt, r_sample, 9); 4385c3fbb6aSGerrit Renker 4397c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 4401a21e49aSGerrit Renker /* 4411a21e49aSGerrit Renker * Larger Initial Windows [RFC 4342, sec. 5] 4421a21e49aSGerrit Renker */ 443a21f9f96SGerrit Renker hctx->ccid3hctx_x = rfc3390_initial_rate(sk); 4449823b7b5SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 445a79ef76fSGerrit Renker 4461266adeeSGerrit Renker ccid3_update_send_interval(hctx); 4475c3fbb6aSGerrit Renker 448a21f9f96SGerrit Renker ccid3_pr_debug("%s(%p), s=%u, MSS=%u, " 4497dfee1a9SGerrit Renker "R_sample=%uus, X=%u\n", dccp_role(sk), 4500f08461eSAndrew Morton sk, hctx->ccid3hctx_s, 4511b07a95aSDavid S. Miller dccp_sk(sk)->dccps_mss_cache, r_sample, 4521a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4535c3fbb6aSGerrit Renker 454a79ef76fSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 455a79ef76fSGerrit Renker } else { 4565c3fbb6aSGerrit Renker 457ff586298SGerrit Renker /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ 458ff586298SGerrit Renker if (hctx->ccid3hctx_p > 0) 459ff586298SGerrit Renker hctx->ccid3hctx_x_calc = 460ff586298SGerrit Renker tfrc_calc_x(hctx->ccid3hctx_s, 461ff586298SGerrit Renker hctx->ccid3hctx_rtt, 462ff586298SGerrit Renker hctx->ccid3hctx_p); 463aa97efd9SGerrit Renker ccid3_hc_tx_update_x(sk, &now); 4647c657876SArnaldo Carvalho de Melo 4657dfee1a9SGerrit Renker ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, " 4668109b02bSArnaldo Carvalho de Melo "p=%u, X_calc=%u, X_recv=%u, X=%u\n", 4678109b02bSArnaldo Carvalho de Melo dccp_role(sk), 4687dfee1a9SGerrit Renker sk, hctx->ccid3hctx_rtt, r_sample, 4695c3fbb6aSGerrit Renker hctx->ccid3hctx_s, hctx->ccid3hctx_p, 4705c3fbb6aSGerrit Renker hctx->ccid3hctx_x_calc, 4719e8efc82SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6), 4721a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4737c657876SArnaldo Carvalho de Melo } 4747c657876SArnaldo Carvalho de Melo 4757c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 4767c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 4777c657876SArnaldo Carvalho de Melo 478c530cfb1SArnaldo Carvalho de Melo /* 4798109b02bSArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible 4808109b02bSArnaldo Carvalho de Melo * that we now can send a packet, so wake up dccp_wait_for_ccid 481c530cfb1SArnaldo Carvalho de Melo */ 482c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 4838c60f3faSArnaldo Carvalho de Melo 4848a508ac2SGerrit Renker /* 4858a508ac2SGerrit Renker * Update timeout interval for the nofeedback timer. 4868a508ac2SGerrit Renker * We use a configuration option to increase the lower bound. 4878109b02bSArnaldo Carvalho de Melo * This can help avoid triggering the nofeedback timer too 4888109b02bSArnaldo Carvalho de Melo * often ('spinning') on LANs with small RTTs. 4898a508ac2SGerrit Renker */ 4905d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 4918a508ac2SGerrit Renker CONFIG_IP_DCCP_CCID3_RTO * 4928a508ac2SGerrit Renker (USEC_PER_SEC/1000)); 4931f2333aeSArnaldo Carvalho de Melo /* 4941f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 4958a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 4961f2333aeSArnaldo Carvalho de Melo */ 4978a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 4987c657876SArnaldo Carvalho de Melo 499a9672411SGerrit Renker ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " 5008109b02bSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5018109b02bSArnaldo Carvalho de Melo dccp_role(sk), 502a9672411SGerrit Renker sk, usecs_to_jiffies(t_nfb), t_nfb); 5037c657876SArnaldo Carvalho de Melo 5047c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5052a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 5067c657876SArnaldo Carvalho de Melo break; 507151a9931SGerrit Renker case TFRC_SSTATE_NO_SENT: /* fall through */ 5085e19e3fcSGerrit Renker case TFRC_SSTATE_TERM: /* ignore feedback when closing */ 5097c657876SArnaldo Carvalho de Melo break; 5107c657876SArnaldo Carvalho de Melo } 5117c657876SArnaldo Carvalho de Melo } 5127c657876SArnaldo Carvalho de Melo 5137c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5141f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5151f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5167c657876SArnaldo Carvalho de Melo { 5177c657876SArnaldo Carvalho de Melo int rc = 0; 51859725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 51959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5207c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 52176fd1e87SGerrit Renker __be32 opt_val; 5227c657876SArnaldo Carvalho de Melo 5237c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5247c657876SArnaldo Carvalho de Melo 5257c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5267c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5277c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5287c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5297c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5307c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5317c657876SArnaldo Carvalho de Melo } 5327c657876SArnaldo Carvalho de Melo 5337c657876SArnaldo Carvalho de Melo switch (option) { 5347c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 53559d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 536a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 53759348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 53859348b19SGerrit Renker dccp_role(sk), sk, len); 5397c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5407c657876SArnaldo Carvalho de Melo } else { 54176fd1e87SGerrit Renker opt_val = get_unaligned((__be32 *)value); 54276fd1e87SGerrit Renker opt_recv->ccid3or_loss_event_rate = ntohl(opt_val); 543a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", 5447c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5457c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 5467c657876SArnaldo Carvalho de Melo } 5477c657876SArnaldo Carvalho de Melo break; 5487c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 5497c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 5507c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 551a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n", 5527c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5537c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 5547c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 5557c657876SArnaldo Carvalho de Melo break; 5567c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 55759d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 558a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 55959348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 56059348b19SGerrit Renker dccp_role(sk), sk, len); 5617c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5627c657876SArnaldo Carvalho de Melo } else { 56376fd1e87SGerrit Renker opt_val = get_unaligned((__be32 *)value); 56476fd1e87SGerrit Renker opt_recv->ccid3or_receive_rate = ntohl(opt_val); 565a9672411SGerrit Renker ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", 5667c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5677c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 5687c657876SArnaldo Carvalho de Melo } 5697c657876SArnaldo Carvalho de Melo break; 5707c657876SArnaldo Carvalho de Melo } 5717c657876SArnaldo Carvalho de Melo 5727c657876SArnaldo Carvalho de Melo return rc; 5737c657876SArnaldo Carvalho de Melo } 5747c657876SArnaldo Carvalho de Melo 57591f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 5767c657876SArnaldo Carvalho de Melo { 57791f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 5787c657876SArnaldo Carvalho de Melo 5797c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 580276f2edcSArnaldo Carvalho de Melo hctx->ccid3hctx_hist = NULL; 581b24b8a24SPavel Emelyanov setup_timer(&hctx->ccid3hctx_no_feedback_timer, 582b24b8a24SPavel Emelyanov ccid3_hc_tx_no_feedback_timer, (unsigned long)sk); 5837c657876SArnaldo Carvalho de Melo 5847c657876SArnaldo Carvalho de Melo return 0; 5857c657876SArnaldo Carvalho de Melo } 5867c657876SArnaldo Carvalho de Melo 5877c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 5887c657876SArnaldo Carvalho de Melo { 58959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5907c657876SArnaldo Carvalho de Melo 5917c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 5927c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5937c657876SArnaldo Carvalho de Melo 594276f2edcSArnaldo Carvalho de Melo tfrc_tx_hist_purge(&hctx->ccid3hctx_hist); 5957c657876SArnaldo Carvalho de Melo } 5967c657876SArnaldo Carvalho de Melo 5979bf17475SGerrit Renker static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 5989bf17475SGerrit Renker { 5992e86908fSGerrit Renker struct ccid3_hc_tx_sock *hctx; 6007c657876SArnaldo Carvalho de Melo 6019bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6029bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6039bf17475SGerrit Renker return; 6049bf17475SGerrit Renker 6052e86908fSGerrit Renker hctx = ccid3_hc_tx_sk(sk); 6069bf17475SGerrit Renker info->tcpi_rto = hctx->ccid3hctx_t_rto; 6079bf17475SGerrit Renker info->tcpi_rtt = hctx->ccid3hctx_rtt; 6089bf17475SGerrit Renker } 6099bf17475SGerrit Renker 6109bf17475SGerrit Renker static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 6119bf17475SGerrit Renker u32 __user *optval, int __user *optlen) 6129bf17475SGerrit Renker { 6132e86908fSGerrit Renker const struct ccid3_hc_tx_sock *hctx; 6149bf17475SGerrit Renker const void *val; 6159bf17475SGerrit Renker 6169bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6179bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6189bf17475SGerrit Renker return -EINVAL; 6199bf17475SGerrit Renker 6202e86908fSGerrit Renker hctx = ccid3_hc_tx_sk(sk); 6219bf17475SGerrit Renker switch (optname) { 6229bf17475SGerrit Renker case DCCP_SOCKOPT_CCID_TX_INFO: 6239bf17475SGerrit Renker if (len < sizeof(hctx->ccid3hctx_tfrc)) 6249bf17475SGerrit Renker return -EINVAL; 6259bf17475SGerrit Renker len = sizeof(hctx->ccid3hctx_tfrc); 6269bf17475SGerrit Renker val = &hctx->ccid3hctx_tfrc; 6279bf17475SGerrit Renker break; 6289bf17475SGerrit Renker default: 6299bf17475SGerrit Renker return -ENOPROTOOPT; 6309bf17475SGerrit Renker } 6319bf17475SGerrit Renker 6329bf17475SGerrit Renker if (put_user(len, optlen) || copy_to_user(optval, val, len)) 6339bf17475SGerrit Renker return -EFAULT; 6349bf17475SGerrit Renker 6359bf17475SGerrit Renker return 0; 6369bf17475SGerrit Renker } 6379bf17475SGerrit Renker 6389bf17475SGerrit Renker /* 6399bf17475SGerrit Renker * Receiver Half-Connection Routines 6409bf17475SGerrit Renker */ 641b84a2189SArnaldo Carvalho de Melo 642b84a2189SArnaldo Carvalho de Melo /* CCID3 feedback types */ 643b84a2189SArnaldo Carvalho de Melo enum ccid3_fback_type { 644b84a2189SArnaldo Carvalho de Melo CCID3_FBACK_NONE = 0, 645b84a2189SArnaldo Carvalho de Melo CCID3_FBACK_INITIAL, 646b84a2189SArnaldo Carvalho de Melo CCID3_FBACK_PERIODIC, 647b84a2189SArnaldo Carvalho de Melo CCID3_FBACK_PARAM_CHANGE 648b84a2189SArnaldo Carvalho de Melo }; 649b84a2189SArnaldo Carvalho de Melo 65056724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6517c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6527c657876SArnaldo Carvalho de Melo { 6537c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6547c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6557c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6567c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6577c657876SArnaldo Carvalho de Melo }; 6587c657876SArnaldo Carvalho de Melo 6597c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6607c657876SArnaldo Carvalho de Melo } 6617c657876SArnaldo Carvalho de Melo #endif 6627c657876SArnaldo Carvalho de Melo 663c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 6641f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 6657c657876SArnaldo Carvalho de Melo { 66659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6677c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 6687c657876SArnaldo Carvalho de Melo 6697c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 6701f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 6711f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 6727c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 6737c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 6747c657876SArnaldo Carvalho de Melo } 6757c657876SArnaldo Carvalho de Melo 676b84a2189SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk, 677b84a2189SArnaldo Carvalho de Melo const struct sk_buff *skb, 678b84a2189SArnaldo Carvalho de Melo enum ccid3_fback_type fbtype) 6797c657876SArnaldo Carvalho de Melo { 68059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6817c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 682e7c23357SArnaldo Carvalho de Melo ktime_t now; 683b84a2189SArnaldo Carvalho de Melo s64 delta = 0; 6847c657876SArnaldo Carvalho de Melo 685b84a2189SArnaldo Carvalho de Melo if (unlikely(hcrx->ccid3hcrx_state == TFRC_RSTATE_TERM)) 686b84a2189SArnaldo Carvalho de Melo return; 687b84a2189SArnaldo Carvalho de Melo 688e7a81c6dSArnaldo Carvalho de Melo now = ktime_get_real(); 689b6ee3d4aSArnaldo Carvalho de Melo 690b84a2189SArnaldo Carvalho de Melo switch (fbtype) { 691b84a2189SArnaldo Carvalho de Melo case CCID3_FBACK_INITIAL: 6927c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 693b84a2189SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ 6947c657876SArnaldo Carvalho de Melo break; 695b84a2189SArnaldo Carvalho de Melo case CCID3_FBACK_PARAM_CHANGE: 696b84a2189SArnaldo Carvalho de Melo /* 697b84a2189SArnaldo Carvalho de Melo * When parameters change (new loss or p > p_prev), we do not 698b84a2189SArnaldo Carvalho de Melo * have a reliable estimate for R_m of [RFC 3448, 6.2] and so 699b84a2189SArnaldo Carvalho de Melo * need to reuse the previous value of X_recv. However, when 700b84a2189SArnaldo Carvalho de Melo * X_recv was 0 (due to early loss), this would kill X down to 701b84a2189SArnaldo Carvalho de Melo * s/t_mbi (i.e. one packet in 64 seconds). 702b84a2189SArnaldo Carvalho de Melo * To avoid such drastic reduction, we approximate X_recv as 703b84a2189SArnaldo Carvalho de Melo * the number of bytes since last feedback. 704b84a2189SArnaldo Carvalho de Melo * This is a safe fallback, since X is bounded above by X_calc. 705b84a2189SArnaldo Carvalho de Melo */ 706b84a2189SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_x_recv > 0) 707b84a2189SArnaldo Carvalho de Melo break; 708b84a2189SArnaldo Carvalho de Melo /* fall through */ 709b84a2189SArnaldo Carvalho de Melo case CCID3_FBACK_PERIODIC: 710b84a2189SArnaldo Carvalho de Melo delta = ktime_us_delta(now, hcrx->ccid3hcrx_tstamp_last_feedback); 711b84a2189SArnaldo Carvalho de Melo if (delta <= 0) 712b84a2189SArnaldo Carvalho de Melo DCCP_BUG("delta (%ld) <= 0", (long)delta); 713b84a2189SArnaldo Carvalho de Melo else 714b9039a2aSGerrit Renker hcrx->ccid3hcrx_x_recv = 715b9039a2aSGerrit Renker scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 7167c657876SArnaldo Carvalho de Melo break; 717b84a2189SArnaldo Carvalho de Melo default: 7187c657876SArnaldo Carvalho de Melo return; 7197c657876SArnaldo Carvalho de Melo } 7207c657876SArnaldo Carvalho de Melo 721b84a2189SArnaldo Carvalho de Melo ccid3_pr_debug("Interval %ldusec, X_recv=%u, 1/p=%u\n", (long)delta, 722b84a2189SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv, hcrx->ccid3hcrx_pinv); 7237c657876SArnaldo Carvalho de Melo 724b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 725b84a2189SArnaldo Carvalho de Melo hcrx->ccid3hcrx_last_counter = dccp_hdr(skb)->dccph_ccval; 7267c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7277c657876SArnaldo Carvalho de Melo 728507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7297c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7307c657876SArnaldo Carvalho de Melo } 7317c657876SArnaldo Carvalho de Melo 7322d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7337c657876SArnaldo Carvalho de Melo { 7342e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 73560fe62e7SAndrea Bittau __be32 x_recv, pinv; 7367c657876SArnaldo Carvalho de Melo 73759d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7382d0817d1SArnaldo Carvalho de Melo return 0; 7397c657876SArnaldo Carvalho de Melo 7402e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 7414fded33bSArnaldo Carvalho de Melo 7424fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7432d0817d1SArnaldo Carvalho de Melo return 0; 7444fded33bSArnaldo Carvalho de Melo 7454fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7464fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7472d0817d1SArnaldo Carvalho de Melo 748385ac2e3SGerrit Renker if (dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7492d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7504fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 7512d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 7522d0817d1SArnaldo Carvalho de Melo return -1; 7532d0817d1SArnaldo Carvalho de Melo 7542d0817d1SArnaldo Carvalho de Melo return 0; 7557c657876SArnaldo Carvalho de Melo } 7567c657876SArnaldo Carvalho de Melo 757954c2db8SGerrit Renker /** ccid3_first_li - Implements [RFC 3448, 6.3.1] 758954c2db8SGerrit Renker * 759954c2db8SGerrit Renker * Determine the length of the first loss interval via inverse lookup. 760954c2db8SGerrit Renker * Assume that X_recv can be computed by the throughput equation 761954c2db8SGerrit Renker * s 762954c2db8SGerrit Renker * X_recv = -------- 763954c2db8SGerrit Renker * R * fval 764954c2db8SGerrit Renker * Find some p such that f(p) = fval; return 1/p (scaled). 765954c2db8SGerrit Renker */ 766954c2db8SGerrit Renker static u32 ccid3_first_li(struct sock *sk) 767954c2db8SGerrit Renker { 768954c2db8SGerrit Renker struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 769954c2db8SGerrit Renker u32 x_recv, p, delta; 770954c2db8SGerrit Renker u64 fval; 771954c2db8SGerrit Renker 772954c2db8SGerrit Renker if (hcrx->ccid3hcrx_rtt == 0) { 773954c2db8SGerrit Renker DCCP_WARN("No RTT estimate available, using fallback RTT\n"); 774954c2db8SGerrit Renker hcrx->ccid3hcrx_rtt = DCCP_FALLBACK_RTT; 775954c2db8SGerrit Renker } 776954c2db8SGerrit Renker 777954c2db8SGerrit Renker delta = ktime_to_us(net_timedelta(hcrx->ccid3hcrx_tstamp_last_feedback)); 778954c2db8SGerrit Renker x_recv = scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 779954c2db8SGerrit Renker if (x_recv == 0) { /* would also trigger divide-by-zero */ 780954c2db8SGerrit Renker DCCP_WARN("X_recv==0\n"); 781954c2db8SGerrit Renker if ((x_recv = hcrx->ccid3hcrx_x_recv) == 0) { 782954c2db8SGerrit Renker DCCP_BUG("stored value of X_recv is zero"); 783954c2db8SGerrit Renker return ~0U; 784954c2db8SGerrit Renker } 785954c2db8SGerrit Renker } 786954c2db8SGerrit Renker 787954c2db8SGerrit Renker fval = scaled_div(hcrx->ccid3hcrx_s, hcrx->ccid3hcrx_rtt); 788954c2db8SGerrit Renker fval = scaled_div32(fval, x_recv); 789954c2db8SGerrit Renker p = tfrc_calc_x_reverse_lookup(fval); 790954c2db8SGerrit Renker 791954c2db8SGerrit Renker ccid3_pr_debug("%s(%p), receive rate=%u bytes/s, implied " 792954c2db8SGerrit Renker "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 793954c2db8SGerrit Renker 794954c2db8SGerrit Renker return p == 0 ? ~0U : scaled_div(1, p); 795954c2db8SGerrit Renker } 796954c2db8SGerrit Renker 7977c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 7987c657876SArnaldo Carvalho de Melo { 79959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 800b84a2189SArnaldo Carvalho de Melo enum ccid3_fback_type do_feedback = CCID3_FBACK_NONE; 801b84a2189SArnaldo Carvalho de Melo const u32 ndp = dccp_sk(sk)->dccps_options_received.dccpor_ndp; 802b84a2189SArnaldo Carvalho de Melo const bool is_data_packet = dccp_data_packet(skb); 8031f2333aeSArnaldo Carvalho de Melo 804b84a2189SArnaldo Carvalho de Melo if (unlikely(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)) { 805b84a2189SArnaldo Carvalho de Melo if (is_data_packet) { 806b84a2189SArnaldo Carvalho de Melo const u32 payload = skb->len - dccp_hdr(skb)->dccph_doff * 4; 807b84a2189SArnaldo Carvalho de Melo do_feedback = CCID3_FBACK_INITIAL; 8087c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 809b84a2189SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = payload; 810b84a2189SArnaldo Carvalho de Melo /* 811b84a2189SArnaldo Carvalho de Melo * Not necessary to update ccid3hcrx_bytes_recv here, 812b84a2189SArnaldo Carvalho de Melo * since X_recv = 0 for the first feedback packet (cf. 813b84a2189SArnaldo Carvalho de Melo * RFC 3448, 6.3) -- gerrit 814b84a2189SArnaldo Carvalho de Melo */ 8157c657876SArnaldo Carvalho de Melo } 816b84a2189SArnaldo Carvalho de Melo goto update_records; 8177c657876SArnaldo Carvalho de Melo } 8187c657876SArnaldo Carvalho de Melo 819b84a2189SArnaldo Carvalho de Melo if (tfrc_rx_hist_duplicate(&hcrx->ccid3hcrx_hist, skb)) 820b84a2189SArnaldo Carvalho de Melo return; /* done receiving */ 8217c657876SArnaldo Carvalho de Melo 822b84a2189SArnaldo Carvalho de Melo if (is_data_packet) { 823b84a2189SArnaldo Carvalho de Melo const u32 payload = skb->len - dccp_hdr(skb)->dccph_doff * 4; 824b84a2189SArnaldo Carvalho de Melo /* 825b84a2189SArnaldo Carvalho de Melo * Update moving-average of s and the sum of received payload bytes 826b84a2189SArnaldo Carvalho de Melo */ 827b84a2189SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = tfrc_ewma(hcrx->ccid3hcrx_s, payload, 9); 828b84a2189SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv += payload; 8297c657876SArnaldo Carvalho de Melo } 830b84a2189SArnaldo Carvalho de Melo 831b84a2189SArnaldo Carvalho de Melo /* 832b84a2189SArnaldo Carvalho de Melo * Handle pending losses and otherwise check for new loss 833b84a2189SArnaldo Carvalho de Melo */ 834954c2db8SGerrit Renker if (tfrc_rx_hist_loss_pending(&hcrx->ccid3hcrx_hist) && 835954c2db8SGerrit Renker tfrc_rx_handle_loss(&hcrx->ccid3hcrx_hist, 836954c2db8SGerrit Renker &hcrx->ccid3hcrx_li_hist, 837954c2db8SGerrit Renker skb, ndp, ccid3_first_li, sk) ) { 838954c2db8SGerrit Renker do_feedback = CCID3_FBACK_PARAM_CHANGE; 839954c2db8SGerrit Renker goto done_receiving; 840954c2db8SGerrit Renker } 841954c2db8SGerrit Renker 842b84a2189SArnaldo Carvalho de Melo if (tfrc_rx_hist_new_loss_indicated(&hcrx->ccid3hcrx_hist, skb, ndp)) 843b84a2189SArnaldo Carvalho de Melo goto update_records; 844b84a2189SArnaldo Carvalho de Melo 845b84a2189SArnaldo Carvalho de Melo /* 846b84a2189SArnaldo Carvalho de Melo * Handle data packets: RTT sampling and monitoring p 847b84a2189SArnaldo Carvalho de Melo */ 848b84a2189SArnaldo Carvalho de Melo if (unlikely(!is_data_packet)) 849b84a2189SArnaldo Carvalho de Melo goto update_records; 850b84a2189SArnaldo Carvalho de Melo 851954c2db8SGerrit Renker if (!tfrc_lh_is_initialised(&hcrx->ccid3hcrx_li_hist)) { 852b84a2189SArnaldo Carvalho de Melo const u32 sample = tfrc_rx_hist_sample_rtt(&hcrx->ccid3hcrx_hist, skb); 853b84a2189SArnaldo Carvalho de Melo /* 854b84a2189SArnaldo Carvalho de Melo * Empty loss history: no loss so far, hence p stays 0. 855b84a2189SArnaldo Carvalho de Melo * Sample RTT values, since an RTT estimate is required for the 856b84a2189SArnaldo Carvalho de Melo * computation of p when the first loss occurs; RFC 3448, 6.3.1. 857b84a2189SArnaldo Carvalho de Melo */ 858b84a2189SArnaldo Carvalho de Melo if (sample != 0) 859b84a2189SArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = tfrc_ewma(hcrx->ccid3hcrx_rtt, sample, 9); 860954c2db8SGerrit Renker 861954c2db8SGerrit Renker } else if (tfrc_lh_update_i_mean(&hcrx->ccid3hcrx_li_hist, skb)) { 862954c2db8SGerrit Renker /* 863954c2db8SGerrit Renker * Step (3) of [RFC 3448, 6.1]: Recompute I_mean and, if I_mean 864954c2db8SGerrit Renker * has decreased (resp. p has increased), send feedback now. 865954c2db8SGerrit Renker */ 866954c2db8SGerrit Renker do_feedback = CCID3_FBACK_PARAM_CHANGE; 867b84a2189SArnaldo Carvalho de Melo } 868b84a2189SArnaldo Carvalho de Melo 869b84a2189SArnaldo Carvalho de Melo /* 870b84a2189SArnaldo Carvalho de Melo * Check if the periodic once-per-RTT feedback is due; RFC 4342, 10.3 871b84a2189SArnaldo Carvalho de Melo */ 872b84a2189SArnaldo Carvalho de Melo if (SUB16(dccp_hdr(skb)->dccph_ccval, hcrx->ccid3hcrx_last_counter) > 3) 873b84a2189SArnaldo Carvalho de Melo do_feedback = CCID3_FBACK_PERIODIC; 874b84a2189SArnaldo Carvalho de Melo 875b84a2189SArnaldo Carvalho de Melo update_records: 876b84a2189SArnaldo Carvalho de Melo tfrc_rx_hist_add_packet(&hcrx->ccid3hcrx_hist, skb, ndp); 877b84a2189SArnaldo Carvalho de Melo 878954c2db8SGerrit Renker done_receiving: 879b84a2189SArnaldo Carvalho de Melo if (do_feedback) 880b84a2189SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk, skb, do_feedback); 8817c657876SArnaldo Carvalho de Melo } 8827c657876SArnaldo Carvalho de Melo 88391f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 8847c657876SArnaldo Carvalho de Melo { 88591f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 8867c657876SArnaldo Carvalho de Melo 8877c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 888954c2db8SGerrit Renker tfrc_lh_init(&hcrx->ccid3hcrx_li_hist); 889b84a2189SArnaldo Carvalho de Melo return tfrc_rx_hist_alloc(&hcrx->ccid3hcrx_hist); 8907c657876SArnaldo Carvalho de Melo } 8917c657876SArnaldo Carvalho de Melo 8927c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 8937c657876SArnaldo Carvalho de Melo { 89459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 8957c657876SArnaldo Carvalho de Melo 8967c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 8977c657876SArnaldo Carvalho de Melo 898d58d1af0SArnaldo Carvalho de Melo tfrc_rx_hist_purge(&hcrx->ccid3hcrx_hist); 899954c2db8SGerrit Renker tfrc_lh_cleanup(&hcrx->ccid3hcrx_li_hist); 9007c657876SArnaldo Carvalho de Melo } 9017c657876SArnaldo Carvalho de Melo 9022babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 9032babe1f6SArnaldo Carvalho de Melo { 9042e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 9052babe1f6SArnaldo Carvalho de Melo 90659c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 90759c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 90859c2353dSArnaldo Carvalho de Melo return; 90959c2353dSArnaldo Carvalho de Melo 9102e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 9112babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 9122babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 9132babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 9142babe1f6SArnaldo Carvalho de Melo } 9152babe1f6SArnaldo Carvalho de Melo 91688f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 91788f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 91888f964dbSArnaldo Carvalho de Melo { 9192e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 92088f964dbSArnaldo Carvalho de Melo const void *val; 92188f964dbSArnaldo Carvalho de Melo 92288f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 92388f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 92488f964dbSArnaldo Carvalho de Melo return -EINVAL; 92588f964dbSArnaldo Carvalho de Melo 9262e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 92788f964dbSArnaldo Carvalho de Melo switch (optname) { 92888f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 92988f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 93088f964dbSArnaldo Carvalho de Melo return -EINVAL; 93188f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 93288f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 93388f964dbSArnaldo Carvalho de Melo break; 93488f964dbSArnaldo Carvalho de Melo default: 93588f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 93688f964dbSArnaldo Carvalho de Melo } 93788f964dbSArnaldo Carvalho de Melo 93888f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 93988f964dbSArnaldo Carvalho de Melo return -EFAULT; 94088f964dbSArnaldo Carvalho de Melo 94188f964dbSArnaldo Carvalho de Melo return 0; 94288f964dbSArnaldo Carvalho de Melo } 94388f964dbSArnaldo Carvalho de Melo 94491f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 9453dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 94684a97b0aSGerrit Renker .ccid_name = "TCP-Friendly Rate Control", 9477c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 94891f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 9497c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 9507c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 9517c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 9527c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 9537c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 9547c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 95591f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 9567c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 9577c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 9587c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 9597c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 9602babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 9612babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 96288f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 96388f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 9647c657876SArnaldo Carvalho de Melo }; 9657c657876SArnaldo Carvalho de Melo 96656724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 967042d18f9SGerrit Renker module_param(ccid3_debug, bool, 0444); 9687c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 96956724aa4SGerrit Renker #endif 9707c657876SArnaldo Carvalho de Melo 9717c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 9727c657876SArnaldo Carvalho de Melo { 97334a9e7eaSArnaldo Carvalho de Melo return ccid_register(&ccid3); 9747c657876SArnaldo Carvalho de Melo } 9757c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 9767c657876SArnaldo Carvalho de Melo 9777c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 9787c657876SArnaldo Carvalho de Melo { 9797c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 9807c657876SArnaldo Carvalho de Melo } 9817c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 9827c657876SArnaldo Carvalho de Melo 983e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 9841f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 9857c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 9867c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 9877c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 988