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); 9184994e16SHarvey Harrison const __u32 w_init = clamp_t(__u32, 4380U, 9284994e16SHarvey Harrison 2 * hctx->ccid3hctx_s, 4 * hctx->ccid3hctx_s); 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 */ 100c4e18dadSIlpo Järvinen static 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) 1347c657876SArnaldo Carvalho de Melo { 13559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1360c150efbSGerrit Renker __u64 min_rate = 2 * hctx->ccid3hctx_x_recv; 1371a21e49aSGerrit Renker const __u64 old_x = hctx->ccid3hctx_x; 138aa97efd9SGerrit Renker ktime_t now = stamp ? *stamp : ktime_get_real(); 1397c657876SArnaldo Carvalho de Melo 1400c150efbSGerrit Renker /* 1410c150efbSGerrit Renker * Handle IDLE periods: do not reduce below RFC3390 initial sending rate 142a5358fdcSGerrit Renker * when idling [RFC 4342, 5.1]. Definition of idling is from rfc3448bis: 143a5358fdcSGerrit Renker * a sender is idle if it has not sent anything over a 2-RTT-period. 1440c150efbSGerrit Renker * For consistency with X and X_recv, min_rate is also scaled by 2^6. 1450c150efbSGerrit Renker */ 146a5358fdcSGerrit Renker if (ccid3_hc_tx_idle_rtt(hctx, now) >= 2) { 1470c150efbSGerrit Renker min_rate = rfc3390_initial_rate(sk); 1480c150efbSGerrit Renker min_rate = max(min_rate, 2 * hctx->ccid3hctx_x_recv); 1490c150efbSGerrit Renker } 1500c150efbSGerrit Renker 15144158306SGerrit Renker if (hctx->ccid3hctx_p > 0) { 1521a21e49aSGerrit Renker 1539e8efc82SGerrit Renker hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6, 1540c150efbSGerrit Renker min_rate); 1559e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, 1569e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 1579e8efc82SGerrit Renker TFRC_T_MBI); 158b6ee3d4aSArnaldo Carvalho de Melo 159aa97efd9SGerrit Renker } else if (ktime_us_delta(now, hctx->ccid3hctx_t_ld) 160aa97efd9SGerrit Renker - (s64)hctx->ccid3hctx_rtt >= 0) { 1611a21e49aSGerrit Renker 1621e2f0e5eSGerrit Renker hctx->ccid3hctx_x = min(2 * hctx->ccid3hctx_x, min_rate); 1631e2f0e5eSGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, 1649e8efc82SGerrit Renker scaled_div(((__u64)hctx->ccid3hctx_s) << 6, 1656b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 166ac198ea8SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 167ac198ea8SArnaldo Carvalho de Melo } 168a79ef76fSGerrit Renker 1698699be7dSIan McDonald if (hctx->ccid3hctx_x != old_x) { 1701761f7d7SGerrit Renker ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, " 1711761f7d7SGerrit Renker "X_recv=%u\n", (unsigned)(old_x >> 6), 1721761f7d7SGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6), 1731761f7d7SGerrit Renker hctx->ccid3hctx_x_calc, 1741761f7d7SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6)); 1758699be7dSIan McDonald 1761266adeeSGerrit Renker ccid3_update_send_interval(hctx); 1777c657876SArnaldo Carvalho de Melo } 1788699be7dSIan McDonald } 1797c657876SArnaldo Carvalho de Melo 18078ad713dSGerrit Renker /* 18178ad713dSGerrit Renker * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) 18278ad713dSGerrit Renker * @len: DCCP packet payload size in bytes 18378ad713dSGerrit Renker */ 18478ad713dSGerrit Renker static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) 18578ad713dSGerrit Renker { 1861266adeeSGerrit Renker const u16 old_s = hctx->ccid3hctx_s; 1871266adeeSGerrit Renker 188c3ada46aSGerrit Renker hctx->ccid3hctx_s = tfrc_ewma(hctx->ccid3hctx_s, len, 9); 1891266adeeSGerrit Renker 1901266adeeSGerrit Renker if (hctx->ccid3hctx_s != old_s) 1911266adeeSGerrit Renker ccid3_update_send_interval(hctx); 19278ad713dSGerrit Renker } 19378ad713dSGerrit Renker 1949f8681dbSGerrit Renker /* 1959f8681dbSGerrit Renker * Update Window Counter using the algorithm from [RFC 4342, 8.1]. 196825de27dSGerrit Renker * As elsewhere, RTT > 0 is assumed by using dccp_sample_rtt(). 1979f8681dbSGerrit Renker */ 1989f8681dbSGerrit Renker static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, 1998132da4dSGerrit Renker ktime_t now) 2009f8681dbSGerrit Renker { 201825de27dSGerrit Renker u32 delta = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count), 202825de27dSGerrit Renker quarter_rtts = (4 * delta) / hctx->ccid3hctx_rtt; 2039f8681dbSGerrit Renker 2049f8681dbSGerrit Renker if (quarter_rtts > 0) { 2058132da4dSGerrit Renker hctx->ccid3hctx_t_last_win_count = now; 206825de27dSGerrit Renker hctx->ccid3hctx_last_win_count += min(quarter_rtts, 5U); 2079f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ 2089f8681dbSGerrit Renker } 2099f8681dbSGerrit Renker } 2109f8681dbSGerrit Renker 2117c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 2127c657876SArnaldo Carvalho de Melo { 2137c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 21459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2152a1fda6fSGerrit Renker unsigned long t_nfb = USEC_PER_SEC / 5; 2167c657876SArnaldo Carvalho de Melo 2177c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 2187c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 2197c657876SArnaldo Carvalho de Melo /* Try again later. */ 2207c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 22148e03eeeSGerrit Renker goto restart_timer; 2227c657876SArnaldo Carvalho de Melo } 2237c657876SArnaldo Carvalho de Melo 224a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk, 2257c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2267c657876SArnaldo Carvalho de Melo 22752515e77SGerrit Renker if (hctx->ccid3hctx_state == TFRC_SSTATE_FBACK) 22852515e77SGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 22952515e77SGerrit Renker else if (hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK) 23052515e77SGerrit Renker goto out; 23152515e77SGerrit Renker 23252515e77SGerrit Renker /* 23352515e77SGerrit Renker * Determine new allowed sending rate X as per draft rfc3448bis-00, 4.4 23452515e77SGerrit Renker */ 23552515e77SGerrit Renker if (hctx->ccid3hctx_t_rto == 0 || /* no feedback received yet */ 23652515e77SGerrit Renker hctx->ccid3hctx_p == 0) { 23752515e77SGerrit Renker 23852515e77SGerrit Renker /* halve send rate directly */ 2399e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2, 2409e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2419e8efc82SGerrit Renker TFRC_T_MBI); 2421266adeeSGerrit Renker ccid3_update_send_interval(hctx); 24352515e77SGerrit Renker } else { 2441f2333aeSArnaldo Carvalho de Melo /* 24552515e77SGerrit Renker * Modify the cached value of X_recv 246ff586298SGerrit Renker * 24752515e77SGerrit Renker * If (X_calc > 2 * X_recv) 2487c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2497c657876SArnaldo Carvalho de Melo * Else 2507c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2511a21e49aSGerrit Renker * 2521a21e49aSGerrit Renker * Note that X_recv is scaled by 2^6 while X_calc is not 2537c657876SArnaldo Carvalho de Melo */ 25444158306SGerrit Renker BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); 2557c657876SArnaldo Carvalho de Melo 25652515e77SGerrit Renker if (hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5)) 2571a21e49aSGerrit Renker hctx->ccid3hctx_x_recv = 2589e8efc82SGerrit Renker max(hctx->ccid3hctx_x_recv / 2, 2599e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2601a21e49aSGerrit Renker (2 * TFRC_T_MBI)); 26152515e77SGerrit Renker else { 2629e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc; 2639e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 4; 2649e8efc82SGerrit Renker } 265aa97efd9SGerrit Renker ccid3_hc_tx_update_x(sk, NULL); 26652515e77SGerrit Renker } 26752515e77SGerrit Renker ccid3_pr_debug("Reduced X to %llu/64 bytes/sec\n", 26852515e77SGerrit Renker (unsigned long long)hctx->ccid3hctx_x); 26952515e77SGerrit Renker 2706b5e633aSArnaldo Carvalho de Melo /* 27152515e77SGerrit Renker * Set new timeout for the nofeedback timer. 2728a508ac2SGerrit Renker * See comments in packet_recv() regarding the value of t_RTO. 2736b5e633aSArnaldo Carvalho de Melo */ 27452515e77SGerrit Renker if (unlikely(hctx->ccid3hctx_t_rto == 0)) /* no feedback yet */ 27552515e77SGerrit Renker t_nfb = TFRC_INITIAL_TIMEOUT; 27652515e77SGerrit Renker else 2778a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 2787c657876SArnaldo Carvalho de Melo 27948e03eeeSGerrit Renker restart_timer: 28048e03eeeSGerrit Renker sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2812a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 2827c657876SArnaldo Carvalho de Melo out: 2837c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2847c657876SArnaldo Carvalho de Melo sock_put(sk); 2857c657876SArnaldo Carvalho de Melo } 2867c657876SArnaldo Carvalho de Melo 2877da7f456SGerrit Renker /* 2887da7f456SGerrit Renker * returns 2897da7f456SGerrit Renker * > 0: delay (in msecs) that should pass before actually sending 2907da7f456SGerrit Renker * = 0: can send immediately 2917da7f456SGerrit Renker * < 0: error condition; do not send packet 2927da7f456SGerrit Renker */ 2936b57c93dSGerrit Renker static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) 2947c657876SArnaldo Carvalho de Melo { 2957c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 29659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2978132da4dSGerrit Renker ktime_t now = ktime_get_real(); 2988132da4dSGerrit Renker s64 delay; 2997c657876SArnaldo Carvalho de Melo 3007c657876SArnaldo Carvalho de Melo /* 301da335bafSGerrit Renker * This function is called only for Data and DataAck packets. Sending 302da335bafSGerrit Renker * zero-sized Data(Ack)s is theoretically possible, but for congestion 303da335bafSGerrit Renker * control this case is pathological - ignore it. 3047c657876SArnaldo Carvalho de Melo */ 3056b57c93dSGerrit Renker if (unlikely(skb->len == 0)) 306da335bafSGerrit Renker return -EBADMSG; 3077c657876SArnaldo Carvalho de Melo 3087c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3097c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3101f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3118109b02bSArnaldo Carvalho de Melo (jiffies + 3128109b02bSArnaldo Carvalho de Melo usecs_to_jiffies(TFRC_INITIAL_TIMEOUT))); 3137c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3147c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 31590feeb95SGerrit Renker 31690feeb95SGerrit Renker /* Set t_0 for initial packet */ 3177c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 31830833ffeSGerrit Renker 31930833ffeSGerrit Renker hctx->ccid3hctx_s = skb->len; 32030833ffeSGerrit Renker 32130833ffeSGerrit Renker /* 32230833ffeSGerrit Renker * Use initial RTT sample when available: recommended by erratum 32330833ffeSGerrit Renker * to RFC 4342. This implements the initialisation procedure of 32430833ffeSGerrit Renker * draft rfc3448bis, section 4.2. Remember, X is scaled by 2^6. 32530833ffeSGerrit Renker */ 32630833ffeSGerrit Renker if (dp->dccps_syn_rtt) { 32730833ffeSGerrit Renker ccid3_pr_debug("SYN RTT = %uus\n", dp->dccps_syn_rtt); 32830833ffeSGerrit Renker hctx->ccid3hctx_rtt = dp->dccps_syn_rtt; 32930833ffeSGerrit Renker hctx->ccid3hctx_x = rfc3390_initial_rate(sk); 33023f062afSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 33130833ffeSGerrit Renker } else { 3323294f202SGerrit Renker /* 3333294f202SGerrit Renker * Sender does not have RTT sample: 3343294f202SGerrit Renker * - set fallback RTT (RFC 4340, 3.4) since a RTT value 3353294f202SGerrit Renker * is needed in several parts (e.g. window counter); 3363294f202SGerrit Renker * - set sending rate X_pps = 1pps as per RFC 3448, 4.2. 3373294f202SGerrit Renker */ 3383294f202SGerrit Renker hctx->ccid3hctx_rtt = DCCP_FALLBACK_RTT; 3396c08b2cfSGerrit Renker hctx->ccid3hctx_x = hctx->ccid3hctx_s; 34030833ffeSGerrit Renker hctx->ccid3hctx_x <<= 6; 34130833ffeSGerrit Renker } 34230833ffeSGerrit Renker ccid3_update_send_interval(hctx); 34330833ffeSGerrit Renker 34430833ffeSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3457c657876SArnaldo Carvalho de Melo break; 3467c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3477c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 3488132da4dSGerrit Renker delay = ktime_us_delta(hctx->ccid3hctx_t_nom, now); 3498699be7dSIan McDonald ccid3_pr_debug("delay=%ld\n", (long)delay); 35091cf5a17SGerrit Renker /* 35191cf5a17SGerrit Renker * Scheduling of packet transmissions [RFC 3448, 4.6] 35291cf5a17SGerrit Renker * 35391cf5a17SGerrit Renker * if (t_now > t_nom - delta) 35491cf5a17SGerrit Renker * // send the packet now 35591cf5a17SGerrit Renker * else 35691cf5a17SGerrit Renker * // send the packet in (t_nom - t_now) milliseconds. 35791cf5a17SGerrit Renker */ 35849d66a70SGerrit Renker if (delay - (s64)hctx->ccid3hctx_delta >= 1000) 3598132da4dSGerrit Renker return (u32)delay / 1000L; 3609f8681dbSGerrit Renker 3618132da4dSGerrit Renker ccid3_hc_tx_update_win_count(hctx, now); 3627c657876SArnaldo Carvalho de Melo break; 36359348b19SGerrit Renker case TFRC_SSTATE_TERM: 364a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 3657da7f456SGerrit Renker return -EINVAL; 3667c657876SArnaldo Carvalho de Melo } 3677c657876SArnaldo Carvalho de Melo 3687da7f456SGerrit Renker /* prepare to send now (add options etc.) */ 369507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 370e312d100SGerrit Renker DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 371e312d100SGerrit Renker 372e312d100SGerrit Renker /* set the nominal send time for the next following packet */ 3738132da4dSGerrit Renker hctx->ccid3hctx_t_nom = ktime_add_us(hctx->ccid3hctx_t_nom, 3748132da4dSGerrit Renker hctx->ccid3hctx_t_ipi); 3757da7f456SGerrit Renker return 0; 3767c657876SArnaldo Carvalho de Melo } 3777c657876SArnaldo Carvalho de Melo 3788109b02bSArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, 3798109b02bSArnaldo Carvalho de Melo unsigned int len) 3807c657876SArnaldo Carvalho de Melo { 38159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3827c657876SArnaldo Carvalho de Melo 38378ad713dSGerrit Renker ccid3_hc_tx_update_s(hctx, len); 38478ad713dSGerrit Renker 385276f2edcSArnaldo Carvalho de Melo if (tfrc_tx_hist_add(&hctx->ccid3hctx_hist, dccp_sk(sk)->dccps_gss)) 386c5a1ae9aSGerrit Renker DCCP_CRIT("packet history - out of memory!"); 3877c657876SArnaldo Carvalho de Melo } 3887c657876SArnaldo Carvalho de Melo 3897c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 3907c657876SArnaldo Carvalho de Melo { 39159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3927c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 3930740d49cSArnaldo Carvalho de Melo ktime_t now; 3942a1fda6fSGerrit Renker unsigned long t_nfb; 3957dfee1a9SGerrit Renker u32 pinv, r_sample; 3961f2333aeSArnaldo Carvalho de Melo 3977c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 3987c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 3997c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4007c657876SArnaldo Carvalho de Melo return; 4015bd370a6SGerrit Renker /* ... and only in the established state */ 4025bd370a6SGerrit Renker if (hctx->ccid3hctx_state != TFRC_SSTATE_FBACK && 4035bd370a6SGerrit Renker hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK) 4045bd370a6SGerrit Renker return; 4057c657876SArnaldo Carvalho de Melo 4067c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4079108d5f4SArnaldo Carvalho de Melo now = ktime_get_real(); 4089108d5f4SArnaldo Carvalho de Melo 4095bd370a6SGerrit Renker /* Estimate RTT from history if ACK number is valid */ 4109108d5f4SArnaldo Carvalho de Melo r_sample = tfrc_tx_hist_rtt(hctx->ccid3hctx_hist, 4119108d5f4SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq, now); 4129108d5f4SArnaldo Carvalho de Melo if (r_sample == 0) { 413276f2edcSArnaldo Carvalho de Melo DCCP_WARN("%s(%p): %s with bogus ACK-%llu\n", dccp_role(sk), sk, 414276f2edcSArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type), 415276f2edcSArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq); 4167c657876SArnaldo Carvalho de Melo return; 4177c657876SArnaldo Carvalho de Melo } 4187c657876SArnaldo Carvalho de Melo 4191a21e49aSGerrit Renker /* Update receive rate in units of 64 * bytes/second */ 4209e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; 4219e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 6; 4225c3fbb6aSGerrit Renker 4235bd370a6SGerrit Renker /* Update loss event rate (which is scaled by 1e6) */ 4245c3fbb6aSGerrit Renker pinv = opt_recv->ccid3or_loss_event_rate; 42545393a66SGerrit Renker if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ 4265c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 0; 42745393a66SGerrit Renker else /* can not exceed 100% */ 428d8d1252fSGerrit Renker hctx->ccid3hctx_p = scaled_div(1, pinv); 4295c3fbb6aSGerrit Renker /* 4309108d5f4SArnaldo Carvalho de Melo * Validate new RTT sample and update moving average 4315c3fbb6aSGerrit Renker */ 4329108d5f4SArnaldo Carvalho de Melo r_sample = dccp_sample_rtt(sk, r_sample); 433c3ada46aSGerrit Renker hctx->ccid3hctx_rtt = tfrc_ewma(hctx->ccid3hctx_rtt, r_sample, 9); 4341a21e49aSGerrit Renker /* 435d8d1252fSGerrit Renker * Update allowed sending rate X as per draft rfc3448bis-00, 4.2/3 436d8d1252fSGerrit Renker */ 437d8d1252fSGerrit Renker if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 438d8d1252fSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 439d8d1252fSGerrit Renker 440d8d1252fSGerrit Renker if (hctx->ccid3hctx_t_rto == 0) { 441d8d1252fSGerrit Renker /* 442d8d1252fSGerrit Renker * Initial feedback packet: Larger Initial Windows (4.2) 4431a21e49aSGerrit Renker */ 444a21f9f96SGerrit Renker hctx->ccid3hctx_x = rfc3390_initial_rate(sk); 4459823b7b5SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 446a79ef76fSGerrit Renker 4471266adeeSGerrit Renker ccid3_update_send_interval(hctx); 4485c3fbb6aSGerrit Renker 449d8d1252fSGerrit Renker goto done_computing_x; 450d8d1252fSGerrit Renker } else if (hctx->ccid3hctx_p == 0) { 451d8d1252fSGerrit Renker /* 452d8d1252fSGerrit Renker * First feedback after nofeedback timer expiry (4.3) 453d8d1252fSGerrit Renker */ 454d8d1252fSGerrit Renker goto done_computing_x; 455d8d1252fSGerrit Renker } 456d8d1252fSGerrit Renker } 4575c3fbb6aSGerrit Renker 458ff586298SGerrit Renker /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ 459ff586298SGerrit Renker if (hctx->ccid3hctx_p > 0) 460ff586298SGerrit Renker hctx->ccid3hctx_x_calc = 461ff586298SGerrit Renker tfrc_calc_x(hctx->ccid3hctx_s, 462ff586298SGerrit Renker hctx->ccid3hctx_rtt, 463ff586298SGerrit Renker hctx->ccid3hctx_p); 464aa97efd9SGerrit Renker ccid3_hc_tx_update_x(sk, &now); 4657c657876SArnaldo Carvalho de Melo 466d8d1252fSGerrit Renker done_computing_x: 4677dfee1a9SGerrit Renker ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, " 4688109b02bSArnaldo Carvalho de Melo "p=%u, X_calc=%u, X_recv=%u, X=%u\n", 4698109b02bSArnaldo Carvalho de Melo dccp_role(sk), 4707dfee1a9SGerrit Renker sk, hctx->ccid3hctx_rtt, r_sample, 4715c3fbb6aSGerrit Renker hctx->ccid3hctx_s, hctx->ccid3hctx_p, 4725c3fbb6aSGerrit Renker hctx->ccid3hctx_x_calc, 4739e8efc82SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6), 4741a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4757c657876SArnaldo Carvalho de Melo 4767c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 4777c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 4787c657876SArnaldo Carvalho de Melo 479c530cfb1SArnaldo Carvalho de Melo /* 4808109b02bSArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible 4818109b02bSArnaldo Carvalho de Melo * that we now can send a packet, so wake up dccp_wait_for_ccid 482c530cfb1SArnaldo Carvalho de Melo */ 483c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 4848c60f3faSArnaldo Carvalho de Melo 4858a508ac2SGerrit Renker /* 4868a508ac2SGerrit Renker * Update timeout interval for the nofeedback timer. 4878a508ac2SGerrit Renker * We use a configuration option to increase the lower bound. 4888109b02bSArnaldo Carvalho de Melo * This can help avoid triggering the nofeedback timer too 4898109b02bSArnaldo Carvalho de Melo * often ('spinning') on LANs with small RTTs. 4908a508ac2SGerrit Renker */ 4915d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 4925bd370a6SGerrit Renker (CONFIG_IP_DCCP_CCID3_RTO * 4935bd370a6SGerrit Renker (USEC_PER_SEC / 1000))); 4941f2333aeSArnaldo Carvalho de Melo /* 4951f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 4968a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 4971f2333aeSArnaldo Carvalho de Melo */ 4988a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 4997c657876SArnaldo Carvalho de Melo 500a9672411SGerrit Renker ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " 5018109b02bSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5028109b02bSArnaldo Carvalho de Melo dccp_role(sk), 503a9672411SGerrit Renker sk, usecs_to_jiffies(t_nfb), t_nfb); 5047c657876SArnaldo Carvalho de Melo 5057c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5062a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 5077c657876SArnaldo Carvalho de Melo } 5087c657876SArnaldo Carvalho de Melo 5097c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5101f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5111f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5127c657876SArnaldo Carvalho de Melo { 5137c657876SArnaldo Carvalho de Melo int rc = 0; 51459725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 51559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5167c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 51776fd1e87SGerrit Renker __be32 opt_val; 5187c657876SArnaldo Carvalho de Melo 5197c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5207c657876SArnaldo Carvalho de Melo 5217c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5227c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5237c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5247c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5257c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5267c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5277c657876SArnaldo Carvalho de Melo } 5287c657876SArnaldo Carvalho de Melo 5297c657876SArnaldo Carvalho de Melo switch (option) { 5307c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 53159d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 532a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 53359348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 53459348b19SGerrit Renker dccp_role(sk), sk, len); 5357c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5367c657876SArnaldo Carvalho de Melo } else { 53776fd1e87SGerrit Renker opt_val = get_unaligned((__be32 *)value); 53876fd1e87SGerrit Renker opt_recv->ccid3or_loss_event_rate = ntohl(opt_val); 539a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", 5407c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5417c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 5427c657876SArnaldo Carvalho de Melo } 5437c657876SArnaldo Carvalho de Melo break; 5447c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 5457c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 5467c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 547a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n", 5487c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5497c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 5507c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 5517c657876SArnaldo Carvalho de Melo break; 5527c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 55359d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 554a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 55559348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 55659348b19SGerrit Renker dccp_role(sk), sk, len); 5577c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5587c657876SArnaldo Carvalho de Melo } else { 55976fd1e87SGerrit Renker opt_val = get_unaligned((__be32 *)value); 56076fd1e87SGerrit Renker opt_recv->ccid3or_receive_rate = ntohl(opt_val); 561a9672411SGerrit Renker ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", 5627c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5637c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 5647c657876SArnaldo Carvalho de Melo } 5657c657876SArnaldo Carvalho de Melo break; 5667c657876SArnaldo Carvalho de Melo } 5677c657876SArnaldo Carvalho de Melo 5687c657876SArnaldo Carvalho de Melo return rc; 5697c657876SArnaldo Carvalho de Melo } 5707c657876SArnaldo Carvalho de Melo 57191f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 5727c657876SArnaldo Carvalho de Melo { 57391f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 5747c657876SArnaldo Carvalho de Melo 5757c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 576276f2edcSArnaldo Carvalho de Melo hctx->ccid3hctx_hist = NULL; 577b24b8a24SPavel Emelyanov setup_timer(&hctx->ccid3hctx_no_feedback_timer, 578b24b8a24SPavel Emelyanov ccid3_hc_tx_no_feedback_timer, (unsigned long)sk); 5797c657876SArnaldo Carvalho de Melo 5807c657876SArnaldo Carvalho de Melo return 0; 5817c657876SArnaldo Carvalho de Melo } 5827c657876SArnaldo Carvalho de Melo 5837c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 5847c657876SArnaldo Carvalho de Melo { 58559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5867c657876SArnaldo Carvalho de Melo 5877c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 5887c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5897c657876SArnaldo Carvalho de Melo 590276f2edcSArnaldo Carvalho de Melo tfrc_tx_hist_purge(&hctx->ccid3hctx_hist); 5917c657876SArnaldo Carvalho de Melo } 5927c657876SArnaldo Carvalho de Melo 5939bf17475SGerrit Renker static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 5949bf17475SGerrit Renker { 5952e86908fSGerrit Renker struct ccid3_hc_tx_sock *hctx; 5967c657876SArnaldo Carvalho de Melo 5979bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 5989bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 5999bf17475SGerrit Renker return; 6009bf17475SGerrit Renker 6012e86908fSGerrit Renker hctx = ccid3_hc_tx_sk(sk); 6029bf17475SGerrit Renker info->tcpi_rto = hctx->ccid3hctx_t_rto; 6039bf17475SGerrit Renker info->tcpi_rtt = hctx->ccid3hctx_rtt; 6049bf17475SGerrit Renker } 6059bf17475SGerrit Renker 6069bf17475SGerrit Renker static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 6079bf17475SGerrit Renker u32 __user *optval, int __user *optlen) 6089bf17475SGerrit Renker { 6092e86908fSGerrit Renker const struct ccid3_hc_tx_sock *hctx; 6109bf17475SGerrit Renker const void *val; 6119bf17475SGerrit Renker 6129bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6139bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6149bf17475SGerrit Renker return -EINVAL; 6159bf17475SGerrit Renker 6162e86908fSGerrit Renker hctx = ccid3_hc_tx_sk(sk); 6179bf17475SGerrit Renker switch (optname) { 6189bf17475SGerrit Renker case DCCP_SOCKOPT_CCID_TX_INFO: 6199bf17475SGerrit Renker if (len < sizeof(hctx->ccid3hctx_tfrc)) 6209bf17475SGerrit Renker return -EINVAL; 6219bf17475SGerrit Renker len = sizeof(hctx->ccid3hctx_tfrc); 6229bf17475SGerrit Renker val = &hctx->ccid3hctx_tfrc; 6239bf17475SGerrit Renker break; 6249bf17475SGerrit Renker default: 6259bf17475SGerrit Renker return -ENOPROTOOPT; 6269bf17475SGerrit Renker } 6279bf17475SGerrit Renker 6289bf17475SGerrit Renker if (put_user(len, optlen) || copy_to_user(optval, val, len)) 6299bf17475SGerrit Renker return -EFAULT; 6309bf17475SGerrit Renker 6319bf17475SGerrit Renker return 0; 6329bf17475SGerrit Renker } 6339bf17475SGerrit Renker 6349bf17475SGerrit Renker /* 6359bf17475SGerrit Renker * Receiver Half-Connection Routines 6369bf17475SGerrit Renker */ 637b84a2189SArnaldo Carvalho de Melo 638b84a2189SArnaldo Carvalho de Melo /* CCID3 feedback types */ 639b84a2189SArnaldo Carvalho de Melo enum ccid3_fback_type { 640b84a2189SArnaldo Carvalho de Melo CCID3_FBACK_NONE = 0, 641b84a2189SArnaldo Carvalho de Melo CCID3_FBACK_INITIAL, 642b84a2189SArnaldo Carvalho de Melo CCID3_FBACK_PERIODIC, 643b84a2189SArnaldo Carvalho de Melo CCID3_FBACK_PARAM_CHANGE 644b84a2189SArnaldo Carvalho de Melo }; 645b84a2189SArnaldo Carvalho de Melo 64656724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6477c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6487c657876SArnaldo Carvalho de Melo { 6497c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6507c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6517c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6527c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6537c657876SArnaldo Carvalho de Melo }; 6547c657876SArnaldo Carvalho de Melo 6557c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6567c657876SArnaldo Carvalho de Melo } 6577c657876SArnaldo Carvalho de Melo #endif 6587c657876SArnaldo Carvalho de Melo 659c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 6601f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 6617c657876SArnaldo Carvalho de Melo { 66259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6637c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 6647c657876SArnaldo Carvalho de Melo 6657c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 6661f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 6671f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 6687c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 6697c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 6707c657876SArnaldo Carvalho de Melo } 6717c657876SArnaldo Carvalho de Melo 672b84a2189SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk, 673b84a2189SArnaldo Carvalho de Melo const struct sk_buff *skb, 674b84a2189SArnaldo Carvalho de Melo enum ccid3_fback_type fbtype) 6757c657876SArnaldo Carvalho de Melo { 67659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6777c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 678e7c23357SArnaldo Carvalho de Melo ktime_t now; 679b84a2189SArnaldo Carvalho de Melo s64 delta = 0; 6807c657876SArnaldo Carvalho de Melo 681b84a2189SArnaldo Carvalho de Melo if (unlikely(hcrx->ccid3hcrx_state == TFRC_RSTATE_TERM)) 682b84a2189SArnaldo Carvalho de Melo return; 683b84a2189SArnaldo Carvalho de Melo 684e7a81c6dSArnaldo Carvalho de Melo now = ktime_get_real(); 685b6ee3d4aSArnaldo Carvalho de Melo 686b84a2189SArnaldo Carvalho de Melo switch (fbtype) { 687b84a2189SArnaldo Carvalho de Melo case CCID3_FBACK_INITIAL: 6887c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 689b84a2189SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ 6907c657876SArnaldo Carvalho de Melo break; 691b84a2189SArnaldo Carvalho de Melo case CCID3_FBACK_PARAM_CHANGE: 692b84a2189SArnaldo Carvalho de Melo /* 693b84a2189SArnaldo Carvalho de Melo * When parameters change (new loss or p > p_prev), we do not 694b84a2189SArnaldo Carvalho de Melo * have a reliable estimate for R_m of [RFC 3448, 6.2] and so 695b84a2189SArnaldo Carvalho de Melo * need to reuse the previous value of X_recv. However, when 696b84a2189SArnaldo Carvalho de Melo * X_recv was 0 (due to early loss), this would kill X down to 697b84a2189SArnaldo Carvalho de Melo * s/t_mbi (i.e. one packet in 64 seconds). 698b84a2189SArnaldo Carvalho de Melo * To avoid such drastic reduction, we approximate X_recv as 699b84a2189SArnaldo Carvalho de Melo * the number of bytes since last feedback. 700b84a2189SArnaldo Carvalho de Melo * This is a safe fallback, since X is bounded above by X_calc. 701b84a2189SArnaldo Carvalho de Melo */ 702b84a2189SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_x_recv > 0) 703b84a2189SArnaldo Carvalho de Melo break; 704b84a2189SArnaldo Carvalho de Melo /* fall through */ 705b84a2189SArnaldo Carvalho de Melo case CCID3_FBACK_PERIODIC: 706b84a2189SArnaldo Carvalho de Melo delta = ktime_us_delta(now, hcrx->ccid3hcrx_tstamp_last_feedback); 707b84a2189SArnaldo Carvalho de Melo if (delta <= 0) 708b84a2189SArnaldo Carvalho de Melo DCCP_BUG("delta (%ld) <= 0", (long)delta); 709b84a2189SArnaldo Carvalho de Melo else 710b9039a2aSGerrit Renker hcrx->ccid3hcrx_x_recv = 711b9039a2aSGerrit Renker scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 7127c657876SArnaldo Carvalho de Melo break; 713b84a2189SArnaldo Carvalho de Melo default: 7147c657876SArnaldo Carvalho de Melo return; 7157c657876SArnaldo Carvalho de Melo } 7167c657876SArnaldo Carvalho de Melo 717b84a2189SArnaldo Carvalho de Melo ccid3_pr_debug("Interval %ldusec, X_recv=%u, 1/p=%u\n", (long)delta, 718b84a2189SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv, hcrx->ccid3hcrx_pinv); 7197c657876SArnaldo Carvalho de Melo 720b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 721b84a2189SArnaldo Carvalho de Melo hcrx->ccid3hcrx_last_counter = dccp_hdr(skb)->dccph_ccval; 7227c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7237c657876SArnaldo Carvalho de Melo 724507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7257c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7267c657876SArnaldo Carvalho de Melo } 7277c657876SArnaldo Carvalho de Melo 7282d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7297c657876SArnaldo Carvalho de Melo { 7302e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 73160fe62e7SAndrea Bittau __be32 x_recv, pinv; 7327c657876SArnaldo Carvalho de Melo 73359d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7342d0817d1SArnaldo Carvalho de Melo return 0; 7357c657876SArnaldo Carvalho de Melo 7362e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 7374fded33bSArnaldo Carvalho de Melo 7384fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7392d0817d1SArnaldo Carvalho de Melo return 0; 7404fded33bSArnaldo Carvalho de Melo 7414fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7424fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7432d0817d1SArnaldo Carvalho de Melo 744385ac2e3SGerrit Renker if (dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7452d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7464fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 7472d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 7482d0817d1SArnaldo Carvalho de Melo return -1; 7492d0817d1SArnaldo Carvalho de Melo 7502d0817d1SArnaldo Carvalho de Melo return 0; 7517c657876SArnaldo Carvalho de Melo } 7527c657876SArnaldo Carvalho de Melo 753954c2db8SGerrit Renker /** ccid3_first_li - Implements [RFC 3448, 6.3.1] 754954c2db8SGerrit Renker * 755954c2db8SGerrit Renker * Determine the length of the first loss interval via inverse lookup. 756954c2db8SGerrit Renker * Assume that X_recv can be computed by the throughput equation 757954c2db8SGerrit Renker * s 758954c2db8SGerrit Renker * X_recv = -------- 759954c2db8SGerrit Renker * R * fval 760954c2db8SGerrit Renker * Find some p such that f(p) = fval; return 1/p (scaled). 761954c2db8SGerrit Renker */ 762954c2db8SGerrit Renker static u32 ccid3_first_li(struct sock *sk) 763954c2db8SGerrit Renker { 764954c2db8SGerrit Renker struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 765954c2db8SGerrit Renker u32 x_recv, p, delta; 766954c2db8SGerrit Renker u64 fval; 767954c2db8SGerrit Renker 768954c2db8SGerrit Renker if (hcrx->ccid3hcrx_rtt == 0) { 769954c2db8SGerrit Renker DCCP_WARN("No RTT estimate available, using fallback RTT\n"); 770954c2db8SGerrit Renker hcrx->ccid3hcrx_rtt = DCCP_FALLBACK_RTT; 771954c2db8SGerrit Renker } 772954c2db8SGerrit Renker 773954c2db8SGerrit Renker delta = ktime_to_us(net_timedelta(hcrx->ccid3hcrx_tstamp_last_feedback)); 774954c2db8SGerrit Renker x_recv = scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 775954c2db8SGerrit Renker if (x_recv == 0) { /* would also trigger divide-by-zero */ 776954c2db8SGerrit Renker DCCP_WARN("X_recv==0\n"); 777954c2db8SGerrit Renker if ((x_recv = hcrx->ccid3hcrx_x_recv) == 0) { 778954c2db8SGerrit Renker DCCP_BUG("stored value of X_recv is zero"); 779954c2db8SGerrit Renker return ~0U; 780954c2db8SGerrit Renker } 781954c2db8SGerrit Renker } 782954c2db8SGerrit Renker 783954c2db8SGerrit Renker fval = scaled_div(hcrx->ccid3hcrx_s, hcrx->ccid3hcrx_rtt); 784954c2db8SGerrit Renker fval = scaled_div32(fval, x_recv); 785954c2db8SGerrit Renker p = tfrc_calc_x_reverse_lookup(fval); 786954c2db8SGerrit Renker 787954c2db8SGerrit Renker ccid3_pr_debug("%s(%p), receive rate=%u bytes/s, implied " 788954c2db8SGerrit Renker "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 789954c2db8SGerrit Renker 790954c2db8SGerrit Renker return p == 0 ? ~0U : scaled_div(1, p); 791954c2db8SGerrit Renker } 792954c2db8SGerrit Renker 7937c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 7947c657876SArnaldo Carvalho de Melo { 79559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 796b84a2189SArnaldo Carvalho de Melo enum ccid3_fback_type do_feedback = CCID3_FBACK_NONE; 7975b5d0e70SGerrit Renker const u64 ndp = dccp_sk(sk)->dccps_options_received.dccpor_ndp; 798b84a2189SArnaldo Carvalho de Melo const bool is_data_packet = dccp_data_packet(skb); 7991f2333aeSArnaldo Carvalho de Melo 800b84a2189SArnaldo Carvalho de Melo if (unlikely(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)) { 801b84a2189SArnaldo Carvalho de Melo if (is_data_packet) { 802b84a2189SArnaldo Carvalho de Melo const u32 payload = skb->len - dccp_hdr(skb)->dccph_doff * 4; 803b84a2189SArnaldo Carvalho de Melo do_feedback = CCID3_FBACK_INITIAL; 8047c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 805b84a2189SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = payload; 806b84a2189SArnaldo Carvalho de Melo /* 807b84a2189SArnaldo Carvalho de Melo * Not necessary to update ccid3hcrx_bytes_recv here, 808b84a2189SArnaldo Carvalho de Melo * since X_recv = 0 for the first feedback packet (cf. 809b84a2189SArnaldo Carvalho de Melo * RFC 3448, 6.3) -- gerrit 810b84a2189SArnaldo Carvalho de Melo */ 8117c657876SArnaldo Carvalho de Melo } 812b84a2189SArnaldo Carvalho de Melo goto update_records; 8137c657876SArnaldo Carvalho de Melo } 8147c657876SArnaldo Carvalho de Melo 815b84a2189SArnaldo Carvalho de Melo if (tfrc_rx_hist_duplicate(&hcrx->ccid3hcrx_hist, skb)) 816b84a2189SArnaldo Carvalho de Melo return; /* done receiving */ 8177c657876SArnaldo Carvalho de Melo 818b84a2189SArnaldo Carvalho de Melo if (is_data_packet) { 819b84a2189SArnaldo Carvalho de Melo const u32 payload = skb->len - dccp_hdr(skb)->dccph_doff * 4; 820b84a2189SArnaldo Carvalho de Melo /* 821b84a2189SArnaldo Carvalho de Melo * Update moving-average of s and the sum of received payload bytes 822b84a2189SArnaldo Carvalho de Melo */ 823b84a2189SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = tfrc_ewma(hcrx->ccid3hcrx_s, payload, 9); 824b84a2189SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv += payload; 8257c657876SArnaldo Carvalho de Melo } 826b84a2189SArnaldo Carvalho de Melo 827b84a2189SArnaldo Carvalho de Melo /* 828b552c623SGerrit Renker * Perform loss detection and handle pending losses 829b84a2189SArnaldo Carvalho de Melo */ 830b552c623SGerrit Renker if (tfrc_rx_handle_loss(&hcrx->ccid3hcrx_hist, &hcrx->ccid3hcrx_li_hist, 831954c2db8SGerrit Renker skb, ndp, ccid3_first_li, sk)) { 832954c2db8SGerrit Renker do_feedback = CCID3_FBACK_PARAM_CHANGE; 833954c2db8SGerrit Renker goto done_receiving; 834954c2db8SGerrit Renker } 835954c2db8SGerrit Renker 836b552c623SGerrit Renker if (tfrc_rx_hist_loss_pending(&hcrx->ccid3hcrx_hist)) 837b552c623SGerrit Renker return; /* done receiving */ 838b84a2189SArnaldo Carvalho de Melo 839b84a2189SArnaldo Carvalho de Melo /* 840b84a2189SArnaldo Carvalho de Melo * Handle data packets: RTT sampling and monitoring p 841b84a2189SArnaldo Carvalho de Melo */ 842b84a2189SArnaldo Carvalho de Melo if (unlikely(!is_data_packet)) 843b84a2189SArnaldo Carvalho de Melo goto update_records; 844b84a2189SArnaldo Carvalho de Melo 845954c2db8SGerrit Renker if (!tfrc_lh_is_initialised(&hcrx->ccid3hcrx_li_hist)) { 846b84a2189SArnaldo Carvalho de Melo const u32 sample = tfrc_rx_hist_sample_rtt(&hcrx->ccid3hcrx_hist, skb); 847b84a2189SArnaldo Carvalho de Melo /* 848b84a2189SArnaldo Carvalho de Melo * Empty loss history: no loss so far, hence p stays 0. 849b84a2189SArnaldo Carvalho de Melo * Sample RTT values, since an RTT estimate is required for the 850b84a2189SArnaldo Carvalho de Melo * computation of p when the first loss occurs; RFC 3448, 6.3.1. 851b84a2189SArnaldo Carvalho de Melo */ 852b84a2189SArnaldo Carvalho de Melo if (sample != 0) 853b84a2189SArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = tfrc_ewma(hcrx->ccid3hcrx_rtt, sample, 9); 854954c2db8SGerrit Renker 855954c2db8SGerrit Renker } else if (tfrc_lh_update_i_mean(&hcrx->ccid3hcrx_li_hist, skb)) { 856954c2db8SGerrit Renker /* 857954c2db8SGerrit Renker * Step (3) of [RFC 3448, 6.1]: Recompute I_mean and, if I_mean 858954c2db8SGerrit Renker * has decreased (resp. p has increased), send feedback now. 859954c2db8SGerrit Renker */ 860954c2db8SGerrit Renker do_feedback = CCID3_FBACK_PARAM_CHANGE; 861b84a2189SArnaldo Carvalho de Melo } 862b84a2189SArnaldo Carvalho de Melo 863b84a2189SArnaldo Carvalho de Melo /* 864b84a2189SArnaldo Carvalho de Melo * Check if the periodic once-per-RTT feedback is due; RFC 4342, 10.3 865b84a2189SArnaldo Carvalho de Melo */ 866b84a2189SArnaldo Carvalho de Melo if (SUB16(dccp_hdr(skb)->dccph_ccval, hcrx->ccid3hcrx_last_counter) > 3) 867b84a2189SArnaldo Carvalho de Melo do_feedback = CCID3_FBACK_PERIODIC; 868b84a2189SArnaldo Carvalho de Melo 869b84a2189SArnaldo Carvalho de Melo update_records: 870b84a2189SArnaldo Carvalho de Melo tfrc_rx_hist_add_packet(&hcrx->ccid3hcrx_hist, skb, ndp); 871b84a2189SArnaldo Carvalho de Melo 872954c2db8SGerrit Renker done_receiving: 873b84a2189SArnaldo Carvalho de Melo if (do_feedback) 874b84a2189SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk, skb, do_feedback); 8757c657876SArnaldo Carvalho de Melo } 8767c657876SArnaldo Carvalho de Melo 87791f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 8787c657876SArnaldo Carvalho de Melo { 87991f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 8807c657876SArnaldo Carvalho de Melo 8817c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 882954c2db8SGerrit Renker tfrc_lh_init(&hcrx->ccid3hcrx_li_hist); 883b84a2189SArnaldo Carvalho de Melo return tfrc_rx_hist_alloc(&hcrx->ccid3hcrx_hist); 8847c657876SArnaldo Carvalho de Melo } 8857c657876SArnaldo Carvalho de Melo 8867c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 8877c657876SArnaldo Carvalho de Melo { 88859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 8897c657876SArnaldo Carvalho de Melo 8907c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 8917c657876SArnaldo Carvalho de Melo 892d58d1af0SArnaldo Carvalho de Melo tfrc_rx_hist_purge(&hcrx->ccid3hcrx_hist); 893954c2db8SGerrit Renker tfrc_lh_cleanup(&hcrx->ccid3hcrx_li_hist); 8947c657876SArnaldo Carvalho de Melo } 8957c657876SArnaldo Carvalho de Melo 8962babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 8972babe1f6SArnaldo Carvalho de Melo { 8982e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 8992babe1f6SArnaldo Carvalho de Melo 90059c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 90159c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 90259c2353dSArnaldo Carvalho de Melo return; 90359c2353dSArnaldo Carvalho de Melo 9042e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 9052babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 9062babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 9072babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 9082babe1f6SArnaldo Carvalho de Melo } 9092babe1f6SArnaldo Carvalho de Melo 91088f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 91188f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 91288f964dbSArnaldo Carvalho de Melo { 9132e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 9148e138e79SGerrit Renker struct tfrc_rx_info rx_info; 91588f964dbSArnaldo Carvalho de Melo const void *val; 91688f964dbSArnaldo Carvalho de Melo 91788f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 91888f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 91988f964dbSArnaldo Carvalho de Melo return -EINVAL; 92088f964dbSArnaldo Carvalho de Melo 9212e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 92288f964dbSArnaldo Carvalho de Melo switch (optname) { 92388f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 9248e138e79SGerrit Renker if (len < sizeof(rx_info)) 92588f964dbSArnaldo Carvalho de Melo return -EINVAL; 9268e138e79SGerrit Renker rx_info.tfrcrx_x_recv = hcrx->ccid3hcrx_x_recv; 9278e138e79SGerrit Renker rx_info.tfrcrx_rtt = hcrx->ccid3hcrx_rtt; 9288e138e79SGerrit Renker rx_info.tfrcrx_p = hcrx->ccid3hcrx_pinv == 0 ? ~0U : 9298e138e79SGerrit Renker scaled_div(1, hcrx->ccid3hcrx_pinv); 9308e138e79SGerrit Renker len = sizeof(rx_info); 9318e138e79SGerrit Renker val = &rx_info; 93288f964dbSArnaldo Carvalho de Melo break; 93388f964dbSArnaldo Carvalho de Melo default: 93488f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 93588f964dbSArnaldo Carvalho de Melo } 93688f964dbSArnaldo Carvalho de Melo 93788f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 93888f964dbSArnaldo Carvalho de Melo return -EFAULT; 93988f964dbSArnaldo Carvalho de Melo 94088f964dbSArnaldo Carvalho de Melo return 0; 94188f964dbSArnaldo Carvalho de Melo } 94288f964dbSArnaldo Carvalho de Melo 94391f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 9443dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 94584a97b0aSGerrit Renker .ccid_name = "TCP-Friendly Rate Control", 9467c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 94791f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 9487c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 9497c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 9507c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 9517c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 9527c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 9537c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 95491f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 9557c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 9567c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 9577c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 9587c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 9592babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 9602babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 96188f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 96288f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 9637c657876SArnaldo Carvalho de Melo }; 9647c657876SArnaldo Carvalho de Melo 96556724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 966042d18f9SGerrit Renker module_param(ccid3_debug, bool, 0444); 9677c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 96856724aa4SGerrit Renker #endif 9697c657876SArnaldo Carvalho de Melo 9707c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 9717c657876SArnaldo Carvalho de Melo { 97234a9e7eaSArnaldo Carvalho de Melo return ccid_register(&ccid3); 9737c657876SArnaldo Carvalho de Melo } 9747c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 9757c657876SArnaldo Carvalho de Melo 9767c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 9777c657876SArnaldo Carvalho de Melo { 9787c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 9797c657876SArnaldo Carvalho de Melo } 9807c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 9817c657876SArnaldo Carvalho de Melo 982e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 9831f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 9847c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 9857c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 9867c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 987