17c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo/* 2954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker * Copyright (c) 2007 The University of Aberdeen, Scotland, UK 3b2f41ff4139c0df8d06f352acc962a62fc07a0c3Ian McDonald * Copyright (c) 2005-7 The University of Waikato, Hamilton, New Zealand. 4b2f41ff4139c0df8d06f352acc962a62fc07a0c3Ian McDonald * Copyright (c) 2005-7 Ian McDonald <ian.mcdonald@jandi.co.nz> 57c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * 67c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * An implementation of the DCCP protocol 77c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * 87c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * This code has been developed by the University of Waikato WAND 97c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * research group. For further information please see http://www.wand.net.nz/ 107c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * 117c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * This code also uses code from Lulea University, rereleased as GPL by its 127c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * authors: 137c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon 147c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * 157c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * Changes to meet Linux coding standards, to make it meet latest ccid3 draft 167c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * and to make it work as a loadable module in the DCCP stack written by 177c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * Arnaldo Carvalho de Melo <acme@conectiva.com.br>. 187c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * 197c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> 207c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * 217c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * This program is free software; you can redistribute it and/or modify 227c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * it under the terms of the GNU General Public License as published by 237c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * the Free Software Foundation; either version 2 of the License, or 247c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * (at your option) any later version. 257c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * 267c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * This program is distributed in the hope that it will be useful, 277c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * but WITHOUT ANY WARRANTY; without even the implied warranty of 287c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 297c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * GNU General Public License for more details. 307c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * 317c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * You should have received a copy of the GNU General Public License 327c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * along with this program; if not, write to the Free Software 337c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 347c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo */ 357c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo#include "../dccp.h" 367c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo#include "ccid3.h" 377c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 3876fd1e87d9456c8185b8df76ac5e533e0c8b39bbGerrit Renker#include <asm/unaligned.h> 3976fd1e87d9456c8185b8df76ac5e533e0c8b39bbGerrit Renker 4056724aa434e9b4d73548021ede7a1474f533f3feGerrit Renker#ifdef CONFIG_IP_DCCP_CCID3_DEBUG 41eb93992207dadb946a3b5cf4544957dc924a6f58Rusty Russellstatic bool ccid3_debug; 4256724aa434e9b4d73548021ede7a1474f533f3feGerrit Renker#define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) 437c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo#else 447c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo#define ccid3_pr_debug(format, a...) 457c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo#endif 467c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 479bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker/* 489bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker * Transmitter Half-Connection Routines 499bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker */ 50410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker#ifdef CONFIG_IP_DCCP_CCID3_DEBUG 51410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renkerstatic const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) 52410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker{ 5336cbd3dcc10384f813ec0814255f576c84f2bcd4Jan Engelhardt static const char *const ccid3_state_names[] = { 54410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker [TFRC_SSTATE_NO_SENT] = "NO_SENT", 55410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", 56410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker [TFRC_SSTATE_FBACK] = "FBACK", 57410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker }; 58410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 59410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker return ccid3_state_names[state]; 60410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker} 61410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker#endif 62410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 63410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renkerstatic void ccid3_hc_tx_set_state(struct sock *sk, 64410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker enum ccid3_hc_tx_states state) 65410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker{ 66996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk); 67996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker enum ccid3_hc_tx_states oldstate = hc->tx_state; 68410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 69410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 70410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker dccp_role(sk), sk, ccid3_tx_state_name(oldstate), 71410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker ccid3_tx_state_name(state)); 72410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker WARN_ON(state == oldstate); 73996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_state = state; 74410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker} 757c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 7617893bc1a632e195574dc0dd9751243f0d5993d2Gerrit Renker/* 776c08b2cf4843788e66a5e69b5512538e686ae3e3Gerrit Renker * Compute the initial sending rate X_init in the manner of RFC 3390: 786c08b2cf4843788e66a5e69b5512538e686ae3e3Gerrit Renker * 79410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * X_init = min(4 * s, max(2 * s, 4380 bytes)) / RTT 806c08b2cf4843788e66a5e69b5512538e686ae3e3Gerrit Renker * 81410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * Note that RFC 3390 uses MSS, RFC 4342 refers to RFC 3390, and rfc3448bis 82410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * (rev-02) clarifies the use of RFC 3390 with regard to the above formula. 83a21f9f96cd035b0d9aec32d80ea0152672fbed42Gerrit Renker * For consistency with other parts of the code, X_init is scaled by 2^6. 84a21f9f96cd035b0d9aec32d80ea0152672fbed42Gerrit Renker */ 85a21f9f96cd035b0d9aec32d80ea0152672fbed42Gerrit Renkerstatic inline u64 rfc3390_initial_rate(struct sock *sk) 86a21f9f96cd035b0d9aec32d80ea0152672fbed42Gerrit Renker{ 87996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker const struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk); 88996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker const __u32 w_init = clamp_t(__u32, 4380U, 2 * hc->tx_s, 4 * hc->tx_s); 89a21f9f96cd035b0d9aec32d80ea0152672fbed42Gerrit Renker 90996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker return scaled_div(w_init << 6, hc->tx_rtt); 91a21f9f96cd035b0d9aec32d80ea0152672fbed42Gerrit Renker} 92a21f9f96cd035b0d9aec32d80ea0152672fbed42Gerrit Renker 9320cbd3e120a0c20bebe420e1fed0e816730bb988Gerrit Renker/** 9420cbd3e120a0c20bebe420e1fed0e816730bb988Gerrit Renker * ccid3_update_send_interval - Calculate new t_ipi = s / X_inst 9520cbd3e120a0c20bebe420e1fed0e816730bb988Gerrit Renker * This respects the granularity of X_inst (64 * bytes/second). 9617893bc1a632e195574dc0dd9751243f0d5993d2Gerrit Renker */ 97996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renkerstatic void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hc) 987c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 99996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_t_ipi = scaled_div32(((u64)hc->tx_s) << 6, hc->tx_x); 100410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 101793734b587a670e47a8d65f9e5211ba2188bb904Gerrit Renker DCCP_BUG_ON(hc->tx_t_ipi == 0); 10220cbd3e120a0c20bebe420e1fed0e816730bb988Gerrit Renker ccid3_pr_debug("t_ipi=%u, s=%u, X=%u\n", hc->tx_t_ipi, 10395c961747284a6b83a5e2d81240e214b0fa3464dEric Dumazet hc->tx_s, (unsigned int)(hc->tx_x >> 6)); 1047c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 105aa97efd97acefb7d3dcd864adb878c7ce34061b3Gerrit Renker 106996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renkerstatic u32 ccid3_hc_tx_idle_rtt(struct ccid3_hc_tx_sock *hc, ktime_t now) 107a5358fdc9c52e44d79dcd144375e089e166508d7Gerrit Renker{ 108996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker u32 delta = ktime_us_delta(now, hc->tx_t_last_win_count); 109a5358fdc9c52e44d79dcd144375e089e166508d7Gerrit Renker 110996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker return delta / hc->tx_rtt; 111a5358fdc9c52e44d79dcd144375e089e166508d7Gerrit Renker} 112a5358fdc9c52e44d79dcd144375e089e166508d7Gerrit Renker 113aa97efd97acefb7d3dcd864adb878c7ce34061b3Gerrit Renker/** 114aa97efd97acefb7d3dcd864adb878c7ce34061b3Gerrit Renker * ccid3_hc_tx_update_x - Update allowed sending rate X 115aa97efd97acefb7d3dcd864adb878c7ce34061b3Gerrit Renker * @stamp: most recent time if available - can be left NULL. 1162c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings * 117aa97efd97acefb7d3dcd864adb878c7ce34061b3Gerrit Renker * This function tracks draft rfc3448bis, check there for latest details. 1185c3fbb6acf9d32772ec7fc01cedd9478d0e26f44Gerrit Renker * 1191a21e49a8d60f588c1276f765198b14d5688a778Gerrit Renker * Note: X and X_recv are both stored in units of 64 * bytes/second, to support 1201a21e49a8d60f588c1276f765198b14d5688a778Gerrit Renker * fine-grained resolution of sending rates. This requires scaling by 2^6 1211a21e49a8d60f588c1276f765198b14d5688a778Gerrit Renker * throughout the code. Only X_calc is unscaled (in bytes/second). 1221a21e49a8d60f588c1276f765198b14d5688a778Gerrit Renker * 1231a21e49a8d60f588c1276f765198b14d5688a778Gerrit Renker */ 124aa97efd97acefb7d3dcd864adb878c7ce34061b3Gerrit Renkerstatic void ccid3_hc_tx_update_x(struct sock *sk, ktime_t *stamp) 1257c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 126996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk); 127996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker __u64 min_rate = 2 * hc->tx_x_recv; 128996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker const __u64 old_x = hc->tx_x; 12952515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker ktime_t now = stamp ? *stamp : ktime_get_real(); 1307c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 1310c150efb280986db7958cf2a559b91d826241e59Gerrit Renker /* 1320c150efb280986db7958cf2a559b91d826241e59Gerrit Renker * Handle IDLE periods: do not reduce below RFC3390 initial sending rate 133a5358fdc9c52e44d79dcd144375e089e166508d7Gerrit Renker * when idling [RFC 4342, 5.1]. Definition of idling is from rfc3448bis: 134a5358fdc9c52e44d79dcd144375e089e166508d7Gerrit Renker * a sender is idle if it has not sent anything over a 2-RTT-period. 1350c150efb280986db7958cf2a559b91d826241e59Gerrit Renker * For consistency with X and X_recv, min_rate is also scaled by 2^6. 1360c150efb280986db7958cf2a559b91d826241e59Gerrit Renker */ 137996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (ccid3_hc_tx_idle_rtt(hc, now) >= 2) { 1380c150efb280986db7958cf2a559b91d826241e59Gerrit Renker min_rate = rfc3390_initial_rate(sk); 139996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker min_rate = max(min_rate, 2 * hc->tx_x_recv); 1400c150efb280986db7958cf2a559b91d826241e59Gerrit Renker } 1410c150efb280986db7958cf2a559b91d826241e59Gerrit Renker 142996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (hc->tx_p > 0) { 1431a21e49a8d60f588c1276f765198b14d5688a778Gerrit Renker 144996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_x = min(((__u64)hc->tx_x_calc) << 6, min_rate); 145996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_x = max(hc->tx_x, (((__u64)hc->tx_s) << 6) / TFRC_T_MBI); 146a79ef76f4d8424324c2f108824a7398571193f43Gerrit Renker 147996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker } else if (ktime_us_delta(now, hc->tx_t_ld) - (s64)hc->tx_rtt >= 0) { 148ac198ea8d94a46830080372a539420cf4a8de4a3Arnaldo Carvalho de Melo 149996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_x = min(2 * hc->tx_x, min_rate); 150996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_x = max(hc->tx_x, 151996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker scaled_div(((__u64)hc->tx_s) << 6, hc->tx_rtt)); 152996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_t_ld = now; 153ff58629824c068e2a75402b5b83f12af0b36d394Gerrit Renker } 154b6ee3d4ada4e85d9b9b9164c1327ef0850c79d5eArnaldo Carvalho de Melo 155996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (hc->tx_x != old_x) { 1561761f7d7fea32c2290710f5c0afa0c3d93220593Gerrit Renker ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, " 15795c961747284a6b83a5e2d81240e214b0fa3464dEric Dumazet "X_recv=%u\n", (unsigned int)(old_x >> 6), 15895c961747284a6b83a5e2d81240e214b0fa3464dEric Dumazet (unsigned int)(hc->tx_x >> 6), hc->tx_x_calc, 15995c961747284a6b83a5e2d81240e214b0fa3464dEric Dumazet (unsigned int)(hc->tx_x_recv >> 6)); 1608699be7d240e37c91a84bdf32e79941d72bc7bd5Ian McDonald 161996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker ccid3_update_send_interval(hc); 1628699be7d240e37c91a84bdf32e79941d72bc7bd5Ian McDonald } 1637c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 1647c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 1652c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings/** 1662c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings * ccid3_hc_tx_update_s - Track the mean packet size `s' 167410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * @len: DCCP packet payload size in bytes 1682c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings * 1692c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings * cf. RFC 4342, 5.3 and RFC 3448, 4.1 17078ad713da673a2977763521c347176137f3e493fGerrit Renker */ 171996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renkerstatic inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hc, int len) 17278ad713da673a2977763521c347176137f3e493fGerrit Renker{ 173996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker const u16 old_s = hc->tx_s; 174410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 175996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_s = tfrc_ewma(hc->tx_s, len, 9); 176410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 177996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (hc->tx_s != old_s) 178996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker ccid3_update_send_interval(hc); 17978ad713da673a2977763521c347176137f3e493fGerrit Renker} 18078ad713da673a2977763521c347176137f3e493fGerrit Renker 1819f8681db961de6d75e43844e9664f1f81e05e1b7Gerrit Renker/* 1828109b02b5397ed52a32c116163a62a34f4768b26Arnaldo Carvalho de Melo * Update Window Counter using the algorithm from [RFC 4342, 8.1]. 183825de27d9e40b3117b29a79d412b7a4b78c5d815Gerrit Renker * As elsewhere, RTT > 0 is assumed by using dccp_sample_rtt(). 1849f8681db961de6d75e43844e9664f1f81e05e1b7Gerrit Renker */ 185996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renkerstatic inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hc, 1868132da4d412ad51c34bad11133a8f0941e2a1972Gerrit Renker ktime_t now) 1879f8681db961de6d75e43844e9664f1f81e05e1b7Gerrit Renker{ 188996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker u32 delta = ktime_us_delta(now, hc->tx_t_last_win_count), 189996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker quarter_rtts = (4 * delta) / hc->tx_rtt; 1909f8681db961de6d75e43844e9664f1f81e05e1b7Gerrit Renker 1919f8681db961de6d75e43844e9664f1f81e05e1b7Gerrit Renker if (quarter_rtts > 0) { 192996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_t_last_win_count = now; 193996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_last_win_count += min(quarter_rtts, 5U); 194996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_last_win_count &= 0xF; /* mod 16 */ 1959f8681db961de6d75e43844e9664f1f81e05e1b7Gerrit Renker } 1969f8681db961de6d75e43844e9664f1f81e05e1b7Gerrit Renker} 1979f8681db961de6d75e43844e9664f1f81e05e1b7Gerrit Renker 1987c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melostatic void ccid3_hc_tx_no_feedback_timer(unsigned long data) 1997c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 2007c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 201996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk); 2022a1fda6f6c01d7ac195c040f14edcf9f64a5451eGerrit Renker unsigned long t_nfb = USEC_PER_SEC / 5; 2037c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 2047c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo bh_lock_sock(sk); 2057c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 2067c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* Try again later. */ 2077c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 20848e03eee715b9e19df03153f2bcce6413632afcbGerrit Renker goto restart_timer; 2097c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo } 2107c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 211b138338056fc423c61a583d45f8aa64cfad87131Frans Pop ccid3_pr_debug("%s(%p, state=%s) - entry\n", dccp_role(sk), sk, 212996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker ccid3_tx_state_name(hc->tx_state)); 213a967241129f6dc1db92fee2c808f73a90f5f47a3Gerrit Renker 21480763dfbac4ed1e6dfe6ec08ef748e0e9aec3260Gerrit Renker /* Ignore and do not restart after leaving the established state */ 21580763dfbac4ed1e6dfe6ec08ef748e0e9aec3260Gerrit Renker if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) 21680763dfbac4ed1e6dfe6ec08ef748e0e9aec3260Gerrit Renker goto out; 21780763dfbac4ed1e6dfe6ec08ef748e0e9aec3260Gerrit Renker 21880763dfbac4ed1e6dfe6ec08ef748e0e9aec3260Gerrit Renker /* Reset feedback state to "no feedback received" */ 219996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (hc->tx_state == TFRC_SSTATE_FBACK) 220410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 221d0995e6a9e3328cdc76b4c45882dee118284f960Gerrit Renker 22252515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker /* 22352515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker * Determine new allowed sending rate X as per draft rfc3448bis-00, 4.4 22467b67e365f07d6dc70f3bb266af3268bac0a4836Gerrit Renker * RTO is 0 if and only if no feedback has been received yet. 22552515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker */ 22667b67e365f07d6dc70f3bb266af3268bac0a4836Gerrit Renker if (hc->tx_t_rto == 0 || hc->tx_p == 0) { 22752515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker 22852515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker /* halve send rate directly */ 229996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_x = max(hc->tx_x / 2, 230996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker (((__u64)hc->tx_s) << 6) / TFRC_T_MBI); 231996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker ccid3_update_send_interval(hc); 23252515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker } else { 2331f2333aea3269e196c44ae9a220e714cc1427792Arnaldo Carvalho de Melo /* 23452515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker * Modify the cached value of X_recv 2350c150efb280986db7958cf2a559b91d826241e59Gerrit Renker * 23652515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker * If (X_calc > 2 * X_recv) 2370c150efb280986db7958cf2a559b91d826241e59Gerrit Renker * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2380c150efb280986db7958cf2a559b91d826241e59Gerrit Renker * Else 2390c150efb280986db7958cf2a559b91d826241e59Gerrit Renker * X_recv = X_calc / 4; 2400c150efb280986db7958cf2a559b91d826241e59Gerrit Renker * 2410c150efb280986db7958cf2a559b91d826241e59Gerrit Renker * Note that X_recv is scaled by 2^6 while X_calc is not 2421f2333aea3269e196c44ae9a220e714cc1427792Arnaldo Carvalho de Melo */ 243996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (hc->tx_x_calc > (hc->tx_x_recv >> 5)) 244996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_x_recv = 245996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker max(hc->tx_x_recv / 2, 246996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker (((__u64)hc->tx_s) << 6) / (2*TFRC_T_MBI)); 24752515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker else { 248996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_x_recv = hc->tx_x_calc; 249996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_x_recv <<= 4; 2507c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo } 251aa97efd97acefb7d3dcd864adb878c7ce34061b3Gerrit Renker ccid3_hc_tx_update_x(sk, NULL); 2527c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo } 25352515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker ccid3_pr_debug("Reduced X to %llu/64 bytes/sec\n", 254996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker (unsigned long long)hc->tx_x); 25552515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker 25652515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker /* 25752515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker * Set new timeout for the nofeedback timer. 25852515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker * See comments in packet_recv() regarding the value of t_RTO. 25952515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker */ 26067b67e365f07d6dc70f3bb266af3268bac0a4836Gerrit Renker if (unlikely(hc->tx_t_rto == 0)) /* no feedback received yet */ 26152515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker t_nfb = TFRC_INITIAL_TIMEOUT; 26252515e77a7a69867c479db4c9efb6be832b82179Gerrit Renker else 263996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker t_nfb = max(hc->tx_t_rto, 2 * hc->tx_t_ipi); 2647c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 26548e03eee715b9e19df03153f2bcce6413632afcbGerrit Renkerrestart_timer: 266996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker sk_reset_timer(sk, &hc->tx_no_feedback_timer, 267c9eaf17341834de00351bf79f16b2d879c8aea96YOSHIFUJI Hideaki jiffies + usecs_to_jiffies(t_nfb)); 2687c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Meloout: 2697c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo bh_unlock_sock(sk); 2707c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo sock_put(sk); 2717c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 2727c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 273fe84f4140f0d24deca8591e38926b95cfd097e62Gerrit Renker/** 274fe84f4140f0d24deca8591e38926b95cfd097e62Gerrit Renker * ccid3_hc_tx_send_packet - Delay-based dequeueing of TX packets 275fe84f4140f0d24deca8591e38926b95cfd097e62Gerrit Renker * @skb: next packet candidate to send on @sk 2762c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings * 277fe84f4140f0d24deca8591e38926b95cfd097e62Gerrit Renker * This function uses the convention of ccid_packet_dequeue_eval() and 278fe84f4140f0d24deca8591e38926b95cfd097e62Gerrit Renker * returns a millisecond-delay value between 0 and t_mbi = 64000 msec. 2797da7f456d7bc0e52009f882e8af0ac910293e157Gerrit Renker */ 2806b57c93dc3aa0115b589cb89ef862d46ab9bd95eGerrit Renkerstatic int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) 2817c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 2827c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 283996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk); 2848132da4d412ad51c34bad11133a8f0941e2a1972Gerrit Renker ktime_t now = ktime_get_real(); 2858132da4d412ad51c34bad11133a8f0941e2a1972Gerrit Renker s64 delay; 2867c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 2877c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* 288da335baf9e788edfb00ee3b96f7b9526b6b2f8a9Gerrit Renker * This function is called only for Data and DataAck packets. Sending 289da335baf9e788edfb00ee3b96f7b9526b6b2f8a9Gerrit Renker * zero-sized Data(Ack)s is theoretically possible, but for congestion 290da335baf9e788edfb00ee3b96f7b9526b6b2f8a9Gerrit Renker * control this case is pathological - ignore it. 2917c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo */ 2926b57c93dc3aa0115b589cb89ef862d46ab9bd95eGerrit Renker if (unlikely(skb->len == 0)) 293da335baf9e788edfb00ee3b96f7b9526b6b2f8a9Gerrit Renker return -EBADMSG; 2947c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 29580763dfbac4ed1e6dfe6ec08ef748e0e9aec3260Gerrit Renker if (hc->tx_state == TFRC_SSTATE_NO_SENT) { 296996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker sk_reset_timer(sk, &hc->tx_no_feedback_timer, (jiffies + 297996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker usecs_to_jiffies(TFRC_INITIAL_TIMEOUT))); 298996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_last_win_count = 0; 299996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_t_last_win_count = now; 30090feeb951f61a80d3a8f8e5ced25b9ec78867eafGerrit Renker 30190feeb951f61a80d3a8f8e5ced25b9ec78867eafGerrit Renker /* Set t_0 for initial packet */ 302996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_t_nom = now; 303410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 304996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_s = skb->len; 30530833ffead66e1f0052150a51db0b45151189ac1Gerrit Renker 30630833ffead66e1f0052150a51db0b45151189ac1Gerrit Renker /* 30730833ffead66e1f0052150a51db0b45151189ac1Gerrit Renker * Use initial RTT sample when available: recommended by erratum 30830833ffead66e1f0052150a51db0b45151189ac1Gerrit Renker * to RFC 4342. This implements the initialisation procedure of 30930833ffead66e1f0052150a51db0b45151189ac1Gerrit Renker * draft rfc3448bis, section 4.2. Remember, X is scaled by 2^6. 31030833ffead66e1f0052150a51db0b45151189ac1Gerrit Renker */ 31130833ffead66e1f0052150a51db0b45151189ac1Gerrit Renker if (dp->dccps_syn_rtt) { 31230833ffead66e1f0052150a51db0b45151189ac1Gerrit Renker ccid3_pr_debug("SYN RTT = %uus\n", dp->dccps_syn_rtt); 313996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_rtt = dp->dccps_syn_rtt; 314996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_x = rfc3390_initial_rate(sk); 315996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_t_ld = now; 31630833ffead66e1f0052150a51db0b45151189ac1Gerrit Renker } else { 3173294f202dc1acd82223e83ef59f272bd87bb06b2Gerrit Renker /* 3183294f202dc1acd82223e83ef59f272bd87bb06b2Gerrit Renker * Sender does not have RTT sample: 3193294f202dc1acd82223e83ef59f272bd87bb06b2Gerrit Renker * - set fallback RTT (RFC 4340, 3.4) since a RTT value 3203294f202dc1acd82223e83ef59f272bd87bb06b2Gerrit Renker * is needed in several parts (e.g. window counter); 3213294f202dc1acd82223e83ef59f272bd87bb06b2Gerrit Renker * - set sending rate X_pps = 1pps as per RFC 3448, 4.2. 3223294f202dc1acd82223e83ef59f272bd87bb06b2Gerrit Renker */ 323996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_rtt = DCCP_FALLBACK_RTT; 324996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_x = hc->tx_s; 325996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_x <<= 6; 32630833ffead66e1f0052150a51db0b45151189ac1Gerrit Renker } 327996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker ccid3_update_send_interval(hc); 32830833ffead66e1f0052150a51db0b45151189ac1Gerrit Renker 329410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 33080763dfbac4ed1e6dfe6ec08ef748e0e9aec3260Gerrit Renker 33180763dfbac4ed1e6dfe6ec08ef748e0e9aec3260Gerrit Renker } else { 332996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker delay = ktime_us_delta(hc->tx_t_nom, now); 3338699be7d240e37c91a84bdf32e79941d72bc7bd5Ian McDonald ccid3_pr_debug("delay=%ld\n", (long)delay); 33491cf5a17257e1d2ef936fbf0223c3436ca583af9Gerrit Renker /* 33520cbd3e120a0c20bebe420e1fed0e816730bb988Gerrit Renker * Scheduling of packet transmissions (RFC 5348, 8.3) 33691cf5a17257e1d2ef936fbf0223c3436ca583af9Gerrit Renker * 33791cf5a17257e1d2ef936fbf0223c3436ca583af9Gerrit Renker * if (t_now > t_nom - delta) 33891cf5a17257e1d2ef936fbf0223c3436ca583af9Gerrit Renker * // send the packet now 33991cf5a17257e1d2ef936fbf0223c3436ca583af9Gerrit Renker * else 34091cf5a17257e1d2ef936fbf0223c3436ca583af9Gerrit Renker * // send the packet in (t_nom - t_now) milliseconds. 34191cf5a17257e1d2ef936fbf0223c3436ca583af9Gerrit Renker */ 34220cbd3e120a0c20bebe420e1fed0e816730bb988Gerrit Renker if (delay >= TFRC_T_DELTA) 34320cbd3e120a0c20bebe420e1fed0e816730bb988Gerrit Renker return (u32)delay / USEC_PER_MSEC; 3449f8681db961de6d75e43844e9664f1f81e05e1b7Gerrit Renker 345996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker ccid3_hc_tx_update_win_count(hc, now); 3467c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo } 3477c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 3487da7f456d7bc0e52009f882e8af0ac910293e157Gerrit Renker /* prepare to send now (add options etc.) */ 3497da7f456d7bc0e52009f882e8af0ac910293e157Gerrit Renker dp->dccps_hc_tx_insert_options = 1; 350996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker DCCP_SKB_CB(skb)->dccpd_ccval = hc->tx_last_win_count; 351e312d100f19fdfe1019512b07a9d15653f254abfGerrit Renker 352e312d100f19fdfe1019512b07a9d15653f254abfGerrit Renker /* set the nominal send time for the next following packet */ 353996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_t_nom = ktime_add_us(hc->tx_t_nom, hc->tx_t_ipi); 354fe84f4140f0d24deca8591e38926b95cfd097e62Gerrit Renker return CCID_PACKET_SEND_AT_ONCE; 3557c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 3567c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 357baf9e782e1dc4991edecfa3b8700cf8739c40259Gerrit Renkerstatic void ccid3_hc_tx_packet_sent(struct sock *sk, unsigned int len) 3587c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 359996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk); 3607c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 361996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker ccid3_hc_tx_update_s(hc, len); 3627c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 363996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (tfrc_tx_hist_add(&hc->tx_hist, dccp_sk(sk)->dccps_gss)) 364c5a1ae9a4cc4aef1505fa0aba079f834c3ee1af1Gerrit Renker DCCP_CRIT("packet history - out of memory!"); 3657c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 3667c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 3677c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melostatic void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 3687c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 369996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk); 370d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker struct tfrc_tx_hist_entry *acked; 3710740d49c2465bdd2644455c4bc49794395b73433Arnaldo Carvalho de Melo ktime_t now; 3722a1fda6f6c01d7ac195c040f14edcf9f64a5451eGerrit Renker unsigned long t_nfb; 373536bb20b45dee3f9b77b0d250f8ed0733a5cb025Gerrit Renker u32 r_sample; 3741f2333aea3269e196c44ae9a220e714cc1427792Arnaldo Carvalho de Melo 3757c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* we are only interested in ACKs */ 3767c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 3777c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 3787c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo return; 379d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker /* 380d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker * Locate the acknowledged packet in the TX history. 381d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker * 382d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker * Returning "entry not found" here can for instance happen when 383d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker * - the host has not sent out anything (e.g. a passive server), 384d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker * - the Ack is outdated (packet with higher Ack number was received), 385d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker * - it is a bogus Ack (for a packet not sent on this connection). 386d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker */ 387d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker acked = tfrc_tx_hist_find_entry(hc->tx_hist, dccp_hdr_ack_seq(skb)); 388d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker if (acked == NULL) 3895bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker return; 390d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker /* For the sake of RTT sampling, ignore/remove all older entries */ 391d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker tfrc_tx_hist_purge(&acked->next); 392d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker 393d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker /* Update the moving average for the RTT estimate (RFC 3448, 4.3) */ 394d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker now = ktime_get_real(); 395d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker r_sample = dccp_sample_rtt(sk, ktime_us_delta(now, acked->stamp)); 396d2c726309d88df3c5568486e4b5b9e4c3150903fGerrit Renker hc->tx_rtt = tfrc_ewma(hc->tx_rtt, r_sample, 9); 39763b3a73bb85daf441f964aaf9b3fc89be4209c23Gerrit Renker 398d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renker /* 399d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renker * Update allowed sending rate X as per draft rfc3448bis-00, 4.2/3 400d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renker */ 401996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (hc->tx_state == TFRC_SSTATE_NO_FBACK) { 402410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 4035c3fbb6acf9d32772ec7fc01cedd9478d0e26f44Gerrit Renker 404996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (hc->tx_t_rto == 0) { 405d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renker /* 406d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renker * Initial feedback packet: Larger Initial Windows (4.2) 407d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renker */ 408996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_x = rfc3390_initial_rate(sk); 409996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_t_ld = now; 410a79ef76f4d8424324c2f108824a7398571193f43Gerrit Renker 411996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker ccid3_update_send_interval(hc); 4127c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 413d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renker goto done_computing_x; 414996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker } else if (hc->tx_p == 0) { 415d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renker /* 416d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renker * First feedback after nofeedback timer expiry (4.3) 417d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renker */ 418d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renker goto done_computing_x; 419d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renker } 420d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renker } 4217c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 422d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renker /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ 423996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (hc->tx_p > 0) 424996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_x_calc = tfrc_calc_x(hc->tx_s, hc->tx_rtt, hc->tx_p); 425d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renker ccid3_hc_tx_update_x(sk, &now); 4267c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 427d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renkerdone_computing_x: 428d8d1252f744cb7cebd6ba3a4b7feec31ff23ccdeGerrit Renker ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, " 4295bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker "p=%u, X_calc=%u, X_recv=%u, X=%u\n", 430996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker dccp_role(sk), sk, hc->tx_rtt, r_sample, 431996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_s, hc->tx_p, hc->tx_x_calc, 43295c961747284a6b83a5e2d81240e214b0fa3464dEric Dumazet (unsigned int)(hc->tx_x_recv >> 6), 43395c961747284a6b83a5e2d81240e214b0fa3464dEric Dumazet (unsigned int)(hc->tx_x >> 6)); 4347c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 4355bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker /* unschedule no feedback timer */ 436996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker sk_stop_timer(sk, &hc->tx_no_feedback_timer); 4377c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 4385bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker /* 4395bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker * As we have calculated new ipi, delta, t_nom it is possible 4405bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker * that we now can send a packet, so wake up dccp_wait_for_ccid 4415bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker */ 4425bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker sk->sk_write_space(sk); 4438c60f3fab55712f23f2bd557ceedfbb00c649f37Arnaldo Carvalho de Melo 4445bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker /* 44589858ad14307a398961a0f1414b04053c1475e4fGerrit Renker * Update timeout interval for the nofeedback timer. In order to control 44689858ad14307a398961a0f1414b04053c1475e4fGerrit Renker * rate halving on networks with very low RTTs (<= 1 ms), use per-route 44789858ad14307a398961a0f1414b04053c1475e4fGerrit Renker * tunable RTAX_RTO_MIN value as the lower bound. 4485bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker */ 44989858ad14307a398961a0f1414b04053c1475e4fGerrit Renker hc->tx_t_rto = max_t(u32, 4 * hc->tx_rtt, 45089858ad14307a398961a0f1414b04053c1475e4fGerrit Renker USEC_PER_SEC/HZ * tcp_rto_min(sk)); 4515bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker /* 4525bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker * Schedule no feedback timer to expire in 4535bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 4545bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker */ 455996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker t_nfb = max(hc->tx_t_rto, 2 * hc->tx_t_ipi); 4567c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 4575bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " 4585bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker "expire in %lu jiffies (%luus)\n", 459388d5e9905dd80648fff5ccaefdd8c0fcedb3eaeGerrit Renker dccp_role(sk), sk, usecs_to_jiffies(t_nfb), t_nfb); 460a967241129f6dc1db92fee2c808f73a90f5f47a3Gerrit Renker 461996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker sk_reset_timer(sk, &hc->tx_no_feedback_timer, 4625bd370a63daf62bb5520c258f04e91a4d9d274ddGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 4637c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 4647c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 4654874c131d79695e3d372042781a408a1a8a762d8Gerrit Renkerstatic int ccid3_hc_tx_parse_options(struct sock *sk, u8 packet_type, 4664874c131d79695e3d372042781a408a1a8a762d8Gerrit Renker u8 option, u8 *optval, u8 optlen) 4677c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 468996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk); 46976fd1e87d9456c8185b8df76ac5e533e0c8b39bbGerrit Renker __be32 opt_val; 4707c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 471410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker switch (option) { 47237efb03fbd0935f5f85a0538c46b53be5cf40504Gerrit Renker case TFRC_OPT_RECEIVE_RATE: 473410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker case TFRC_OPT_LOSS_EVENT_RATE: 4744874c131d79695e3d372042781a408a1a8a762d8Gerrit Renker /* Must be ignored on Data packets, cf. RFC 4342 8.3 and 8.5 */ 4754874c131d79695e3d372042781a408a1a8a762d8Gerrit Renker if (packet_type == DCCP_PKT_DATA) 4764874c131d79695e3d372042781a408a1a8a762d8Gerrit Renker break; 4774874c131d79695e3d372042781a408a1a8a762d8Gerrit Renker if (unlikely(optlen != 4)) { 47837efb03fbd0935f5f85a0538c46b53be5cf40504Gerrit Renker DCCP_WARN("%s(%p), invalid len %d for %u\n", 4794874c131d79695e3d372042781a408a1a8a762d8Gerrit Renker dccp_role(sk), sk, optlen, option); 48037efb03fbd0935f5f85a0538c46b53be5cf40504Gerrit Renker return -EINVAL; 4817c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo } 4824874c131d79695e3d372042781a408a1a8a762d8Gerrit Renker opt_val = ntohl(get_unaligned((__be32 *)optval)); 48337efb03fbd0935f5f85a0538c46b53be5cf40504Gerrit Renker 48437efb03fbd0935f5f85a0538c46b53be5cf40504Gerrit Renker if (option == TFRC_OPT_RECEIVE_RATE) { 485536bb20b45dee3f9b77b0d250f8ed0733a5cb025Gerrit Renker /* Receive Rate is kept in units of 64 bytes/second */ 486536bb20b45dee3f9b77b0d250f8ed0733a5cb025Gerrit Renker hc->tx_x_recv = opt_val; 487536bb20b45dee3f9b77b0d250f8ed0733a5cb025Gerrit Renker hc->tx_x_recv <<= 6; 488536bb20b45dee3f9b77b0d250f8ed0733a5cb025Gerrit Renker 489410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", 49037efb03fbd0935f5f85a0538c46b53be5cf40504Gerrit Renker dccp_role(sk), sk, opt_val); 49137efb03fbd0935f5f85a0538c46b53be5cf40504Gerrit Renker } else { 492536bb20b45dee3f9b77b0d250f8ed0733a5cb025Gerrit Renker /* Update the fixpoint Loss Event Rate fraction */ 493536bb20b45dee3f9b77b0d250f8ed0733a5cb025Gerrit Renker hc->tx_p = tfrc_invert_loss_event_rate(opt_val); 494536bb20b45dee3f9b77b0d250f8ed0733a5cb025Gerrit Renker 49537efb03fbd0935f5f85a0538c46b53be5cf40504Gerrit Renker ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", 49637efb03fbd0935f5f85a0538c46b53be5cf40504Gerrit Renker dccp_role(sk), sk, opt_val); 497410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker } 4987c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo } 49937efb03fbd0935f5f85a0538c46b53be5cf40504Gerrit Renker return 0; 5007c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 5017c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 50291f0ebf7b6d5cb2b6e818d48587566144821babeArnaldo Carvalho de Melostatic int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 5037c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 504996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker struct ccid3_hc_tx_sock *hc = ccid_priv(ccid); 5057c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 506996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_state = TFRC_SSTATE_NO_SENT; 507996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_hist = NULL; 508996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker setup_timer(&hc->tx_no_feedback_timer, 509410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker ccid3_hc_tx_no_feedback_timer, (unsigned long)sk); 5107c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo return 0; 5117c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 5127c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 5137c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melostatic void ccid3_hc_tx_exit(struct sock *sk) 5147c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 515996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk); 5167c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 517996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker sk_stop_timer(sk, &hc->tx_no_feedback_timer); 518996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker tfrc_tx_hist_purge(&hc->tx_hist); 5197c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 5207c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 5219bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renkerstatic void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 5229bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker{ 52351c22bb510fefbb1a87c02dbd835383e6e7e3d36Gerrit Renker info->tcpi_rto = ccid3_hc_tx_sk(sk)->tx_t_rto; 52451c22bb510fefbb1a87c02dbd835383e6e7e3d36Gerrit Renker info->tcpi_rtt = ccid3_hc_tx_sk(sk)->tx_rtt; 5259bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker} 5269bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker 5279bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renkerstatic int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 5289bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker u32 __user *optval, int __user *optlen) 5299bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker{ 53051c22bb510fefbb1a87c02dbd835383e6e7e3d36Gerrit Renker const struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk); 53167b67e365f07d6dc70f3bb266af3268bac0a4836Gerrit Renker struct tfrc_tx_info tfrc; 5329bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker const void *val; 5339bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker 5349bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker switch (optname) { 5359bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker case DCCP_SOCKOPT_CCID_TX_INFO: 53667b67e365f07d6dc70f3bb266af3268bac0a4836Gerrit Renker if (len < sizeof(tfrc)) 5379bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker return -EINVAL; 5387b07f8eb75aa3097cdfd4f6eac3da49db787381dMathias Krause memset(&tfrc, 0, sizeof(tfrc)); 53967b67e365f07d6dc70f3bb266af3268bac0a4836Gerrit Renker tfrc.tfrctx_x = hc->tx_x; 54067b67e365f07d6dc70f3bb266af3268bac0a4836Gerrit Renker tfrc.tfrctx_x_recv = hc->tx_x_recv; 54167b67e365f07d6dc70f3bb266af3268bac0a4836Gerrit Renker tfrc.tfrctx_x_calc = hc->tx_x_calc; 54267b67e365f07d6dc70f3bb266af3268bac0a4836Gerrit Renker tfrc.tfrctx_rtt = hc->tx_rtt; 54367b67e365f07d6dc70f3bb266af3268bac0a4836Gerrit Renker tfrc.tfrctx_p = hc->tx_p; 54467b67e365f07d6dc70f3bb266af3268bac0a4836Gerrit Renker tfrc.tfrctx_rto = hc->tx_t_rto; 54567b67e365f07d6dc70f3bb266af3268bac0a4836Gerrit Renker tfrc.tfrctx_ipi = hc->tx_t_ipi; 54667b67e365f07d6dc70f3bb266af3268bac0a4836Gerrit Renker len = sizeof(tfrc); 54767b67e365f07d6dc70f3bb266af3268bac0a4836Gerrit Renker val = &tfrc; 5489bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker break; 5499bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker default: 5509bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker return -ENOPROTOOPT; 5519bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker } 5529bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker 5539bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker if (put_user(len, optlen) || copy_to_user(optval, val, len)) 5549bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker return -EFAULT; 5559bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker 5569bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker return 0; 5579bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker} 5589bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker 5597c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo/* 5609bf17475eb658a920125bd8f05edf9c57c2dd950Gerrit Renker * Receiver Half-Connection Routines 5617c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo */ 562410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 563410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker/* CCID3 feedback types */ 564410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renkerenum ccid3_fback_type { 565410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker CCID3_FBACK_NONE = 0, 566410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker CCID3_FBACK_INITIAL, 567410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker CCID3_FBACK_PERIODIC, 568410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker CCID3_FBACK_PARAM_CHANGE 569410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker}; 570410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 571410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker#ifdef CONFIG_IP_DCCP_CCID3_DEBUG 572410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renkerstatic const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 573410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker{ 57436cbd3dcc10384f813ec0814255f576c84f2bcd4Jan Engelhardt static const char *const ccid3_rx_state_names[] = { 575410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker [TFRC_RSTATE_NO_DATA] = "NO_DATA", 576410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker [TFRC_RSTATE_DATA] = "DATA", 577410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker }; 578410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 579410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker return ccid3_rx_state_names[state]; 580410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker} 581410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker#endif 582410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 583410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renkerstatic void ccid3_hc_rx_set_state(struct sock *sk, 584410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker enum ccid3_hc_rx_states state) 585410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker{ 586996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker struct ccid3_hc_rx_sock *hc = ccid3_hc_rx_sk(sk); 587996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker enum ccid3_hc_rx_states oldstate = hc->rx_state; 588410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 589410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 590410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 591410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker ccid3_rx_state_name(state)); 592410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker WARN_ON(state == oldstate); 593996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->rx_state = state; 594410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker} 595410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 596b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melostatic void ccid3_hc_rx_send_feedback(struct sock *sk, 597b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melo const struct sk_buff *skb, 598b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melo enum ccid3_fback_type fbtype) 5997c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 600996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker struct ccid3_hc_rx_sock *hc = ccid3_hc_rx_sk(sk); 601410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker struct dccp_sock *dp = dccp_sk(sk); 60280763dfbac4ed1e6dfe6ec08ef748e0e9aec3260Gerrit Renker ktime_t now = ktime_get_real(); 603410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker s64 delta = 0; 604410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 605b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melo switch (fbtype) { 606b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melo case CCID3_FBACK_INITIAL: 607996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->rx_x_recv = 0; 608996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->rx_pinv = ~0U; /* see RFC 4342, 8.5 */ 6097c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo break; 610b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melo case CCID3_FBACK_PARAM_CHANGE: 611b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melo /* 612b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melo * When parameters change (new loss or p > p_prev), we do not 613b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melo * have a reliable estimate for R_m of [RFC 3448, 6.2] and so 614410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * need to reuse the previous value of X_recv. However, when 615410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * X_recv was 0 (due to early loss), this would kill X down to 616410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * s/t_mbi (i.e. one packet in 64 seconds). 617410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * To avoid such drastic reduction, we approximate X_recv as 618410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * the number of bytes since last feedback. 619410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * This is a safe fallback, since X is bounded above by X_calc. 620b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melo */ 621996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (hc->rx_x_recv > 0) 622410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker break; 623410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker /* fall through */ 624b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melo case CCID3_FBACK_PERIODIC: 625996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker delta = ktime_us_delta(now, hc->rx_tstamp_last_feedback); 626410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker if (delta <= 0) 627410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker DCCP_BUG("delta (%ld) <= 0", (long)delta); 628410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker else 629996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->rx_x_recv = scaled_div32(hc->rx_bytes_recv, delta); 6307c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo break; 631b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melo default: 6327c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo return; 6337c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo } 6347c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 635410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker ccid3_pr_debug("Interval %ldusec, X_recv=%u, 1/p=%u\n", (long)delta, 636996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->rx_x_recv, hc->rx_pinv); 6377c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 638996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->rx_tstamp_last_feedback = now; 639996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->rx_last_counter = dccp_hdr(skb)->dccph_ccval; 640996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->rx_bytes_recv = 0; 64168c89ee53571a441799c03d5e240c6441bced620Gerrit Renker 642410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker dp->dccps_hc_rx_insert_options = 1; 643410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker dccp_send_ack(sk); 6447c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 6457c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 6462d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melostatic int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 6477c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 64851c22bb510fefbb1a87c02dbd835383e6e7e3d36Gerrit Renker const struct ccid3_hc_rx_sock *hc = ccid3_hc_rx_sk(sk); 64960fe62e789076ae7c13f7ffb35fec4b24802530dAndrea Bittau __be32 x_recv, pinv; 6507c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 65159d203f9e989c81defc2cb1c559d678e16dbe684Arnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 6522d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo return 0; 6537c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 6544fded33b3e8177d1d2eec0ccc69af8dfe8b4c3c3Arnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 6552d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo return 0; 6562d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo 657996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker x_recv = htonl(hc->rx_x_recv); 658996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker pinv = htonl(hc->rx_pinv); 6592d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo 660a7d13fbf85375698879d16f118af77fbfcc2de44Gerrit Renker if (dccp_insert_option(skb, TFRC_OPT_LOSS_EVENT_RATE, 6618109b02b5397ed52a32c116163a62a34f4768b26Arnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 662a7d13fbf85375698879d16f118af77fbfcc2de44Gerrit Renker dccp_insert_option(skb, TFRC_OPT_RECEIVE_RATE, 6638109b02b5397ed52a32c116163a62a34f4768b26Arnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 6642d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo return -1; 6652d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo 6662d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo return 0; 6677c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 6687c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 669aa1b1ff0991b469eca6fde4456190df6ed59ff40Gerrit Renker/** 670aa1b1ff0991b469eca6fde4456190df6ed59ff40Gerrit Renker * ccid3_first_li - Implements [RFC 5348, 6.3.1] 671954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker * 672954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker * Determine the length of the first loss interval via inverse lookup. 673954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker * Assume that X_recv can be computed by the throughput equation 674954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker * s 675954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker * X_recv = -------- 676954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker * R * fval 677954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker * Find some p such that f(p) = fval; return 1/p (scaled). 678954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker */ 679954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renkerstatic u32 ccid3_first_li(struct sock *sk) 680954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker{ 681996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker struct ccid3_hc_rx_sock *hc = ccid3_hc_rx_sk(sk); 682410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker u32 x_recv, p, delta; 683954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker u64 fval; 684954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker 685996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (hc->rx_rtt == 0) { 686410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker DCCP_WARN("No RTT estimate available, using fallback RTT\n"); 687996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->rx_rtt = DCCP_FALLBACK_RTT; 688410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker } 689d20ed95f8bf3d98d31dbbab8b00bb4c1a4a140f3Gerrit Renker 690996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker delta = ktime_to_us(net_timedelta(hc->rx_tstamp_last_feedback)); 691996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker x_recv = scaled_div32(hc->rx_bytes_recv, delta); 692410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker if (x_recv == 0) { /* would also trigger divide-by-zero */ 693410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker DCCP_WARN("X_recv==0\n"); 69467b67e365f07d6dc70f3bb266af3268bac0a4836Gerrit Renker if (hc->rx_x_recv == 0) { 695410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker DCCP_BUG("stored value of X_recv is zero"); 696410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker return ~0U; 697410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker } 69867b67e365f07d6dc70f3bb266af3268bac0a4836Gerrit Renker x_recv = hc->rx_x_recv; 699410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker } 700954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker 701996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker fval = scaled_div(hc->rx_s, hc->rx_rtt); 702410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker fval = scaled_div32(fval, x_recv); 703954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker p = tfrc_calc_x_reverse_lookup(fval); 704954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker 705954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker ccid3_pr_debug("%s(%p), receive rate=%u bytes/s, implied " 706954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 707954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker 708410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker return p == 0 ? ~0U : scaled_div(1, p); 709954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker} 710954c2db868ce896325dced91d5fba5e2226897a4Gerrit Renker 711b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melostatic void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 7127c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 713996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker struct ccid3_hc_rx_sock *hc = ccid3_hc_rx_sk(sk); 714410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker enum ccid3_fback_type do_feedback = CCID3_FBACK_NONE; 7155b5d0e704880addfd979c262e6441f126708539cGerrit Renker const u64 ndp = dccp_sk(sk)->dccps_options_received.dccpor_ndp; 716b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melo const bool is_data_packet = dccp_data_packet(skb); 717b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melo 718996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (unlikely(hc->rx_state == TFRC_RSTATE_NO_DATA)) { 719410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker if (is_data_packet) { 720410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker const u32 payload = skb->len - dccp_hdr(skb)->dccph_doff * 4; 721410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker do_feedback = CCID3_FBACK_INITIAL; 722410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 723996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->rx_s = payload; 724410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker /* 725388d5e9905dd80648fff5ccaefdd8c0fcedb3eaeGerrit Renker * Not necessary to update rx_bytes_recv here, 726410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * since X_recv = 0 for the first feedback packet (cf. 727410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * RFC 3448, 6.3) -- gerrit 728410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker */ 729410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker } 730410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker goto update_records; 731410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker } 732410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 733996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (tfrc_rx_hist_duplicate(&hc->rx_hist, skb)) 734410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker return; /* done receiving */ 735410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 736410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker if (is_data_packet) { 737410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker const u32 payload = skb->len - dccp_hdr(skb)->dccph_doff * 4; 738410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker /* 739410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * Update moving-average of s and the sum of received payload bytes 740410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker */ 741996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->rx_s = tfrc_ewma(hc->rx_s, payload, 9); 742996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->rx_bytes_recv += payload; 743410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker } 744410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 745d20ed95f8bf3d98d31dbbab8b00bb4c1a4a140f3Gerrit Renker /* 746d20ed95f8bf3d98d31dbbab8b00bb4c1a4a140f3Gerrit Renker * Perform loss detection and handle pending losses 747d20ed95f8bf3d98d31dbbab8b00bb4c1a4a140f3Gerrit Renker */ 748996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (tfrc_rx_handle_loss(&hc->rx_hist, &hc->rx_li_hist, 749410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker skb, ndp, ccid3_first_li, sk)) { 750410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker do_feedback = CCID3_FBACK_PARAM_CHANGE; 751410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker goto done_receiving; 752410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker } 753410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 754996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (tfrc_rx_hist_loss_pending(&hc->rx_hist)) 755410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker return; /* done receiving */ 756410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 75788e97a93342c0b9e835d510921e7b2df8547d1bdGerrit Renker /* 758410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * Handle data packets: RTT sampling and monitoring p 75988e97a93342c0b9e835d510921e7b2df8547d1bdGerrit Renker */ 760410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker if (unlikely(!is_data_packet)) 761410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker goto update_records; 762410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 763996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (!tfrc_lh_is_initialised(&hc->rx_li_hist)) { 764996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker const u32 sample = tfrc_rx_hist_sample_rtt(&hc->rx_hist, skb); 765410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker /* 766410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * Empty loss history: no loss so far, hence p stays 0. 767410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * Sample RTT values, since an RTT estimate is required for the 768410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * computation of p when the first loss occurs; RFC 3448, 6.3.1. 769410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker */ 770410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker if (sample != 0) 771996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->rx_rtt = tfrc_ewma(hc->rx_rtt, sample, 9); 772410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 773996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker } else if (tfrc_lh_update_i_mean(&hc->rx_li_hist, skb)) { 774410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker /* 775410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * Step (3) of [RFC 3448, 6.1]: Recompute I_mean and, if I_mean 776410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker * has decreased (resp. p has increased), send feedback now. 777410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker */ 778410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker do_feedback = CCID3_FBACK_PARAM_CHANGE; 779410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker } 780410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 781b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melo /* 782b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melo * Check if the periodic once-per-RTT feedback is due; RFC 4342, 10.3 783b84a2189c4e1835c51fd6b974a0497be9bc4ba87Arnaldo Carvalho de Melo */ 784996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (SUB16(dccp_hdr(skb)->dccph_ccval, hc->rx_last_counter) > 3) 785410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker do_feedback = CCID3_FBACK_PERIODIC; 786410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 787410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renkerupdate_records: 788996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker tfrc_rx_hist_add_packet(&hc->rx_hist, skb, ndp); 789410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker 790410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renkerdone_receiving: 791410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker if (do_feedback) 792410e27a49bb98bc7fa3ff5fc05cc313817b9f253Gerrit Renker ccid3_hc_rx_send_feedback(sk, skb, do_feedback); 7937c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 7947c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 79591f0ebf7b6d5cb2b6e818d48587566144821babeArnaldo Carvalho de Melostatic int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 7967c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 797996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker struct ccid3_hc_rx_sock *hc = ccid_priv(ccid); 7987c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 799996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->rx_state = TFRC_RSTATE_NO_DATA; 800996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker tfrc_lh_init(&hc->rx_li_hist); 801996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker return tfrc_rx_hist_alloc(&hc->rx_hist); 8027c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 8037c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 8047c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melostatic void ccid3_hc_rx_exit(struct sock *sk) 8057c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 806996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker struct ccid3_hc_rx_sock *hc = ccid3_hc_rx_sk(sk); 8077c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 808996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker tfrc_rx_hist_purge(&hc->rx_hist); 809996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker tfrc_lh_cleanup(&hc->rx_li_hist); 8107c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 8117c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 8122babe1f6fea717c36c008c878fe095d1ca5696c1Arnaldo Carvalho de Melostatic void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 8132babe1f6fea717c36c008c878fe095d1ca5696c1Arnaldo Carvalho de Melo{ 81451c22bb510fefbb1a87c02dbd835383e6e7e3d36Gerrit Renker info->tcpi_ca_state = ccid3_hc_rx_sk(sk)->rx_state; 8158109b02b5397ed52a32c116163a62a34f4768b26Arnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 81651c22bb510fefbb1a87c02dbd835383e6e7e3d36Gerrit Renker info->tcpi_rcv_rtt = ccid3_hc_rx_sk(sk)->rx_rtt; 8172babe1f6fea717c36c008c878fe095d1ca5696c1Arnaldo Carvalho de Melo} 8182babe1f6fea717c36c008c878fe095d1ca5696c1Arnaldo Carvalho de Melo 81988f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melostatic int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 82088f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 82188f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo{ 82251c22bb510fefbb1a87c02dbd835383e6e7e3d36Gerrit Renker const struct ccid3_hc_rx_sock *hc = ccid3_hc_rx_sk(sk); 8238e138e7949490eebdccbd65b1f660a0488149a6bGerrit Renker struct tfrc_rx_info rx_info; 82488f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo const void *val; 825c9eaf17341834de00351bf79f16b2d879c8aea96YOSHIFUJI Hideaki 82688f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo switch (optname) { 82788f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 8288e138e7949490eebdccbd65b1f660a0488149a6bGerrit Renker if (len < sizeof(rx_info)) 82988f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo return -EINVAL; 830996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker rx_info.tfrcrx_x_recv = hc->rx_x_recv; 831996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker rx_info.tfrcrx_rtt = hc->rx_rtt; 832792e6d3389061ad449429b9ba228eb758c247ea0Gerrit Renker rx_info.tfrcrx_p = tfrc_invert_loss_event_rate(hc->rx_pinv); 8338e138e7949490eebdccbd65b1f660a0488149a6bGerrit Renker len = sizeof(rx_info); 8348e138e7949490eebdccbd65b1f660a0488149a6bGerrit Renker val = &rx_info; 83588f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo break; 83688f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo default: 83788f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo return -ENOPROTOOPT; 83888f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo } 83988f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo 84088f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 84188f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo return -EFAULT; 84288f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo 84388f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo return 0; 84488f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo} 84588f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo 846ddebc973c56b51b4e5d84d606f0430d81b895d67Gerrit Renkerstruct ccid_operations ccid3_ops = { 8473dd9a7c3a155ee96160876cba92439fdc96d7e0bIan McDonald .ccid_id = DCCPC_CCID3, 84884a97b0af8c29aa5a47cc5271968a9c6004fb91eGerrit Renker .ccid_name = "TCP-Friendly Rate Control", 84991f0ebf7b6d5cb2b6e818d48587566144821babeArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 8507c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 8517c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 8527c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 8537c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 8547c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 8557c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 85691f0ebf7b6d5cb2b6e818d48587566144821babeArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 8577c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 8587c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 8597c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 8607c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 8612babe1f6fea717c36c008c878fe095d1ca5696c1Arnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 8622babe1f6fea717c36c008c878fe095d1ca5696c1Arnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 86388f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 86488f964db6ef728982734356bf4c406270ea29c1dArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 8657c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo}; 8668109b02b5397ed52a32c116163a62a34f4768b26Arnaldo Carvalho de Melo 86756724aa434e9b4d73548021ede7a1474f533f3feGerrit Renker#ifdef CONFIG_IP_DCCP_CCID3_DEBUG 868432649916b0435b608fb3e1fcb97347ac294d38dGerrit Renkermodule_param(ccid3_debug, bool, 0644); 869ddebc973c56b51b4e5d84d606f0430d81b895d67Gerrit RenkerMODULE_PARM_DESC(ccid3_debug, "Enable CCID-3 debug messages"); 87056724aa434e9b4d73548021ede7a1474f533f3feGerrit Renker#endif 871