17c657876SArnaldo Carvalho de Melo /* 27c657876SArnaldo Carvalho de Melo * net/dccp/ccids/ccid3.c 37c657876SArnaldo Carvalho de Melo * 4b2f41ff4SIan McDonald * Copyright (c) 2005-7 The University of Waikato, Hamilton, New Zealand. 5b2f41ff4SIan McDonald * Copyright (c) 2005-7 Ian McDonald <ian.mcdonald@jandi.co.nz> 67c657876SArnaldo Carvalho de Melo * 77c657876SArnaldo Carvalho de Melo * An implementation of the DCCP protocol 87c657876SArnaldo Carvalho de Melo * 97c657876SArnaldo Carvalho de Melo * This code has been developed by the University of Waikato WAND 107c657876SArnaldo Carvalho de Melo * research group. For further information please see http://www.wand.net.nz/ 117c657876SArnaldo Carvalho de Melo * 127c657876SArnaldo Carvalho de Melo * This code also uses code from Lulea University, rereleased as GPL by its 137c657876SArnaldo Carvalho de Melo * authors: 147c657876SArnaldo Carvalho de Melo * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon 157c657876SArnaldo Carvalho de Melo * 167c657876SArnaldo Carvalho de Melo * Changes to meet Linux coding standards, to make it meet latest ccid3 draft 177c657876SArnaldo Carvalho de Melo * and to make it work as a loadable module in the DCCP stack written by 187c657876SArnaldo Carvalho de Melo * Arnaldo Carvalho de Melo <acme@conectiva.com.br>. 197c657876SArnaldo Carvalho de Melo * 207c657876SArnaldo Carvalho de Melo * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> 217c657876SArnaldo Carvalho de Melo * 227c657876SArnaldo Carvalho de Melo * This program is free software; you can redistribute it and/or modify 237c657876SArnaldo Carvalho de Melo * it under the terms of the GNU General Public License as published by 247c657876SArnaldo Carvalho de Melo * the Free Software Foundation; either version 2 of the License, or 257c657876SArnaldo Carvalho de Melo * (at your option) any later version. 267c657876SArnaldo Carvalho de Melo * 277c657876SArnaldo Carvalho de Melo * This program is distributed in the hope that it will be useful, 287c657876SArnaldo Carvalho de Melo * but WITHOUT ANY WARRANTY; without even the implied warranty of 297c657876SArnaldo Carvalho de Melo * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 307c657876SArnaldo Carvalho de Melo * GNU General Public License for more details. 317c657876SArnaldo Carvalho de Melo * 327c657876SArnaldo Carvalho de Melo * You should have received a copy of the GNU General Public License 337c657876SArnaldo Carvalho de Melo * along with this program; if not, write to the Free Software 347c657876SArnaldo Carvalho de Melo * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 357c657876SArnaldo Carvalho de Melo */ 367c657876SArnaldo Carvalho de Melo #include "../ccid.h" 377c657876SArnaldo Carvalho de Melo #include "../dccp.h" 384524b259SArnaldo Carvalho de Melo #include "lib/packet_history.h" 39ae6706f0SArnaldo Carvalho de Melo #include "lib/loss_interval.h" 4036729c1aSArnaldo Carvalho de Melo #include "lib/tfrc.h" 417c657876SArnaldo Carvalho de Melo #include "ccid3.h" 427c657876SArnaldo Carvalho de Melo 4376fd1e87SGerrit Renker #include <asm/unaligned.h> 4476fd1e87SGerrit Renker 4556724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 4656724aa4SGerrit Renker static int ccid3_debug; 4756724aa4SGerrit Renker #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) 487c657876SArnaldo Carvalho de Melo #else 497c657876SArnaldo Carvalho de Melo #define ccid3_pr_debug(format, a...) 507c657876SArnaldo Carvalho de Melo #endif 517c657876SArnaldo Carvalho de Melo 52a1d3a355SArnaldo Carvalho de Melo static struct dccp_tx_hist *ccid3_tx_hist; 53a1d3a355SArnaldo Carvalho de Melo static struct dccp_rx_hist *ccid3_rx_hist; 547c657876SArnaldo Carvalho de Melo 559bf17475SGerrit Renker /* 569bf17475SGerrit Renker * Transmitter Half-Connection Routines 579bf17475SGerrit Renker */ 5856724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 597c657876SArnaldo Carvalho de Melo static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) 607c657876SArnaldo Carvalho de Melo { 617c657876SArnaldo Carvalho de Melo static char *ccid3_state_names[] = { 627c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_SENT] = "NO_SENT", 637c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", 647c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_FBACK] = "FBACK", 657c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_TERM] = "TERM", 667c657876SArnaldo Carvalho de Melo }; 677c657876SArnaldo Carvalho de Melo 687c657876SArnaldo Carvalho de Melo return ccid3_state_names[state]; 697c657876SArnaldo Carvalho de Melo } 707c657876SArnaldo Carvalho de Melo #endif 717c657876SArnaldo Carvalho de Melo 72c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_tx_set_state(struct sock *sk, 731f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_tx_states state) 747c657876SArnaldo Carvalho de Melo { 7559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 767c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; 777c657876SArnaldo Carvalho de Melo 787c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 791f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_tx_state_name(oldstate), 801f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(state)); 817c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 827c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = state; 837c657876SArnaldo Carvalho de Melo } 847c657876SArnaldo Carvalho de Melo 8517893bc1SGerrit Renker /* 86a21f9f96SGerrit Renker * Compute the initial sending rate X_init according to RFC 3390: 87a21f9f96SGerrit Renker * w_init = min(4 * MSS, max(2 * MSS, 4380 bytes)) 88a21f9f96SGerrit Renker * X_init = w_init / RTT 89a21f9f96SGerrit Renker * For consistency with other parts of the code, X_init is scaled by 2^6. 90a21f9f96SGerrit Renker */ 91a21f9f96SGerrit Renker static inline u64 rfc3390_initial_rate(struct sock *sk) 92a21f9f96SGerrit Renker { 93a21f9f96SGerrit Renker const struct dccp_sock *dp = dccp_sk(sk); 94a21f9f96SGerrit Renker const __u32 w_init = min(4 * dp->dccps_mss_cache, 95a21f9f96SGerrit Renker max(2 * dp->dccps_mss_cache, 4380U)); 96a21f9f96SGerrit Renker 97a21f9f96SGerrit Renker return scaled_div(w_init << 6, ccid3_hc_tx_sk(sk)->ccid3hctx_rtt); 98a21f9f96SGerrit Renker } 99a21f9f96SGerrit Renker 100a21f9f96SGerrit Renker /* 1011266adeeSGerrit Renker * Recalculate t_ipi and delta (should be called whenever X changes) 10217893bc1SGerrit Renker */ 1031266adeeSGerrit Renker static inline void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hctx) 1047c657876SArnaldo Carvalho de Melo { 1051a21e49aSGerrit Renker /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */ 106b2449fdcSGerrit Renker hctx->ccid3hctx_t_ipi = scaled_div32(((u64)hctx->ccid3hctx_s) << 6, 107b2449fdcSGerrit Renker hctx->ccid3hctx_x); 10817893bc1SGerrit Renker 1097c657876SArnaldo Carvalho de Melo /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ 1101f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, 1111f2333aeSArnaldo Carvalho de Melo TFRC_OPSYS_HALF_TIME_GRAN); 1128699be7dSIan McDonald 1131761f7d7SGerrit Renker ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n", 1148699be7dSIan McDonald hctx->ccid3hctx_t_ipi, hctx->ccid3hctx_delta, 1151761f7d7SGerrit Renker hctx->ccid3hctx_s, (unsigned)(hctx->ccid3hctx_x >> 6)); 1168699be7dSIan McDonald 1177c657876SArnaldo Carvalho de Melo } 118aa97efd9SGerrit Renker 119aa97efd9SGerrit Renker /** 120aa97efd9SGerrit Renker * ccid3_hc_tx_update_x - Update allowed sending rate X 121aa97efd9SGerrit Renker * @stamp: most recent time if available - can be left NULL. 122aa97efd9SGerrit Renker * This function tracks draft rfc3448bis, check there for latest details. 1235c3fbb6aSGerrit Renker * 1241a21e49aSGerrit Renker * Note: X and X_recv are both stored in units of 64 * bytes/second, to support 1251a21e49aSGerrit Renker * fine-grained resolution of sending rates. This requires scaling by 2^6 1261a21e49aSGerrit Renker * throughout the code. Only X_calc is unscaled (in bytes/second). 1271a21e49aSGerrit Renker * 1287c657876SArnaldo Carvalho de Melo */ 129aa97efd9SGerrit Renker static void ccid3_hc_tx_update_x(struct sock *sk, ktime_t *stamp) 130a79ef76fSGerrit Renker 1317c657876SArnaldo Carvalho de Melo { 13259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1330c150efbSGerrit Renker __u64 min_rate = 2 * hctx->ccid3hctx_x_recv; 1341a21e49aSGerrit Renker const __u64 old_x = hctx->ccid3hctx_x; 135aa97efd9SGerrit Renker ktime_t now = stamp? *stamp : ktime_get_real(); 1367c657876SArnaldo Carvalho de Melo 1370c150efbSGerrit Renker /* 1380c150efbSGerrit Renker * Handle IDLE periods: do not reduce below RFC3390 initial sending rate 1390c150efbSGerrit Renker * when idling [RFC 4342, 5.1]. See also draft-ietf-dccp-rfc3448bis. 1400c150efbSGerrit Renker * For consistency with X and X_recv, min_rate is also scaled by 2^6. 1410c150efbSGerrit Renker */ 1420c150efbSGerrit Renker if (unlikely(hctx->ccid3hctx_idle)) { 1430c150efbSGerrit Renker min_rate = rfc3390_initial_rate(sk); 1440c150efbSGerrit Renker min_rate = max(min_rate, 2 * hctx->ccid3hctx_x_recv); 1450c150efbSGerrit Renker } 1460c150efbSGerrit Renker 14744158306SGerrit Renker if (hctx->ccid3hctx_p > 0) { 1481a21e49aSGerrit Renker 1499e8efc82SGerrit Renker hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6, 1500c150efbSGerrit Renker min_rate); 1519e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, 1529e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 1539e8efc82SGerrit Renker TFRC_T_MBI); 154b6ee3d4aSArnaldo Carvalho de Melo 155aa97efd9SGerrit Renker } else if (ktime_us_delta(now, hctx->ccid3hctx_t_ld) 156aa97efd9SGerrit Renker - (s64)hctx->ccid3hctx_rtt >= 0) { 1571a21e49aSGerrit Renker 1589e8efc82SGerrit Renker hctx->ccid3hctx_x = 1590c150efbSGerrit Renker max(min(2 * hctx->ccid3hctx_x, min_rate), 1609e8efc82SGerrit Renker scaled_div(((__u64)hctx->ccid3hctx_s) << 6, 1616b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 162ac198ea8SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 163ac198ea8SArnaldo Carvalho de Melo } 164a79ef76fSGerrit Renker 1658699be7dSIan McDonald if (hctx->ccid3hctx_x != old_x) { 1661761f7d7SGerrit Renker ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, " 1671761f7d7SGerrit Renker "X_recv=%u\n", (unsigned)(old_x >> 6), 1681761f7d7SGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6), 1691761f7d7SGerrit Renker hctx->ccid3hctx_x_calc, 1701761f7d7SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6)); 1718699be7dSIan McDonald 1721266adeeSGerrit Renker ccid3_update_send_interval(hctx); 1737c657876SArnaldo Carvalho de Melo } 1748699be7dSIan McDonald } 1757c657876SArnaldo Carvalho de Melo 17678ad713dSGerrit Renker /* 17778ad713dSGerrit Renker * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) 17878ad713dSGerrit Renker * @len: DCCP packet payload size in bytes 17978ad713dSGerrit Renker */ 18078ad713dSGerrit Renker static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) 18178ad713dSGerrit Renker { 1821266adeeSGerrit Renker const u16 old_s = hctx->ccid3hctx_s; 1831266adeeSGerrit Renker 1841266adeeSGerrit Renker hctx->ccid3hctx_s = old_s == 0 ? len : (9 * old_s + len) / 10; 1851266adeeSGerrit Renker 1861266adeeSGerrit Renker if (hctx->ccid3hctx_s != old_s) 1871266adeeSGerrit Renker ccid3_update_send_interval(hctx); 18878ad713dSGerrit Renker } 18978ad713dSGerrit Renker 1909f8681dbSGerrit Renker /* 1919f8681dbSGerrit Renker * Update Window Counter using the algorithm from [RFC 4342, 8.1]. 1929f8681dbSGerrit Renker * The algorithm is not applicable if RTT < 4 microseconds. 1939f8681dbSGerrit Renker */ 1949f8681dbSGerrit Renker static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, 1958132da4dSGerrit Renker ktime_t now) 1969f8681dbSGerrit Renker { 1979f8681dbSGerrit Renker u32 quarter_rtts; 1989f8681dbSGerrit Renker 1999f8681dbSGerrit Renker if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ 2009f8681dbSGerrit Renker return; 2019f8681dbSGerrit Renker 2028132da4dSGerrit Renker quarter_rtts = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count); 2038132da4dSGerrit Renker quarter_rtts /= hctx->ccid3hctx_rtt / 4; 2049f8681dbSGerrit Renker 2059f8681dbSGerrit Renker if (quarter_rtts > 0) { 2068132da4dSGerrit Renker hctx->ccid3hctx_t_last_win_count = now; 2079f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); 2089f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ 2099f8681dbSGerrit Renker } 2109f8681dbSGerrit Renker } 2119f8681dbSGerrit Renker 2127c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 2137c657876SArnaldo Carvalho de Melo { 2147c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 21559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2162a1fda6fSGerrit Renker unsigned long t_nfb = USEC_PER_SEC / 5; 2177c657876SArnaldo Carvalho de Melo 2187c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 2197c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 2207c657876SArnaldo Carvalho de Melo /* Try again later. */ 2217c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 22248e03eeeSGerrit Renker goto restart_timer; 2237c657876SArnaldo Carvalho de Melo } 2247c657876SArnaldo Carvalho de Melo 225a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk, 2267c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2277c657876SArnaldo Carvalho de Melo 2280c150efbSGerrit Renker hctx->ccid3hctx_idle = 1; 2290c150efbSGerrit Renker 2307c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 2317c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 232a79ef76fSGerrit Renker /* RFC 3448, 4.4: Halve send rate directly */ 2339e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2, 2349e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2359e8efc82SGerrit Renker TFRC_T_MBI); 2367c657876SArnaldo Carvalho de Melo 237a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u " 238a9672411SGerrit Renker "bytes/s\n", dccp_role(sk), sk, 2391f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 2401a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 24148e03eeeSGerrit Renker /* The value of R is still undefined and so we can not recompute 2425e8e034cSJoe Perches * the timeout value. Keep initial value as per [RFC 4342, 5]. */ 2432a1fda6fSGerrit Renker t_nfb = TFRC_INITIAL_TIMEOUT; 2441266adeeSGerrit Renker ccid3_update_send_interval(hctx); 2457c657876SArnaldo Carvalho de Melo break; 2467c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 2471f2333aeSArnaldo Carvalho de Melo /* 248ff586298SGerrit Renker * Modify the cached value of X_recv [RFC 3448, 4.4] 249ff586298SGerrit Renker * 250ff586298SGerrit Renker * If (p == 0 || X_calc > 2 * X_recv) 2517c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2527c657876SArnaldo Carvalho de Melo * Else 2537c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2541a21e49aSGerrit Renker * 2551a21e49aSGerrit Renker * Note that X_recv is scaled by 2^6 while X_calc is not 2567c657876SArnaldo Carvalho de Melo */ 25744158306SGerrit Renker BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); 2587c657876SArnaldo Carvalho de Melo 25944158306SGerrit Renker if (hctx->ccid3hctx_p == 0 || 2600c150efbSGerrit Renker (hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5))) { 2611a21e49aSGerrit Renker 2621a21e49aSGerrit Renker hctx->ccid3hctx_x_recv = 2639e8efc82SGerrit Renker max(hctx->ccid3hctx_x_recv / 2, 2649e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2651a21e49aSGerrit Renker (2 * TFRC_T_MBI)); 2669e8efc82SGerrit Renker } else { 2679e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc; 2689e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 4; 2699e8efc82SGerrit Renker } 270ff586298SGerrit Renker /* Now recalculate X [RFC 3448, 4.3, step (4)] */ 271aa97efd9SGerrit Renker ccid3_hc_tx_update_x(sk, NULL); 2726b5e633aSArnaldo Carvalho de Melo /* 2736b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2748a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 2758a508ac2SGerrit Renker * See comments in packet_recv() regarding the value of t_RTO. 2766b5e633aSArnaldo Carvalho de Melo */ 2778a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 2787c657876SArnaldo Carvalho de Melo break; 27959348b19SGerrit Renker case TFRC_SSTATE_NO_SENT: 280a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk), sk); 28159348b19SGerrit Renker /* fall through */ 28259348b19SGerrit Renker case TFRC_SSTATE_TERM: 2837c657876SArnaldo Carvalho de Melo goto out; 2847c657876SArnaldo Carvalho de Melo } 2857c657876SArnaldo Carvalho de Melo 28648e03eeeSGerrit Renker restart_timer: 28748e03eeeSGerrit Renker sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2882a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 2897c657876SArnaldo Carvalho de Melo out: 2907c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2917c657876SArnaldo Carvalho de Melo sock_put(sk); 2927c657876SArnaldo Carvalho de Melo } 2937c657876SArnaldo Carvalho de Melo 2947da7f456SGerrit Renker /* 2957da7f456SGerrit Renker * returns 2967da7f456SGerrit Renker * > 0: delay (in msecs) that should pass before actually sending 2977da7f456SGerrit Renker * = 0: can send immediately 2987da7f456SGerrit Renker * < 0: error condition; do not send packet 2997da7f456SGerrit Renker */ 3006b57c93dSGerrit Renker static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) 3017c657876SArnaldo Carvalho de Melo { 3027c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 30359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3048132da4dSGerrit Renker ktime_t now = ktime_get_real(); 3058132da4dSGerrit Renker s64 delay; 3067c657876SArnaldo Carvalho de Melo 3077c657876SArnaldo Carvalho de Melo /* 308da335bafSGerrit Renker * This function is called only for Data and DataAck packets. Sending 309da335bafSGerrit Renker * zero-sized Data(Ack)s is theoretically possible, but for congestion 310da335bafSGerrit Renker * control this case is pathological - ignore it. 3117c657876SArnaldo Carvalho de Melo */ 3126b57c93dSGerrit Renker if (unlikely(skb->len == 0)) 313da335bafSGerrit Renker return -EBADMSG; 3147c657876SArnaldo Carvalho de Melo 3157c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3167c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3171f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3188109b02bSArnaldo Carvalho de Melo (jiffies + 3198109b02bSArnaldo Carvalho de Melo usecs_to_jiffies(TFRC_INITIAL_TIMEOUT))); 3207c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3217c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 32290feeb95SGerrit Renker 32390feeb95SGerrit Renker /* Set t_0 for initial packet */ 3247c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 32530833ffeSGerrit Renker 32630833ffeSGerrit Renker hctx->ccid3hctx_s = skb->len; 32730833ffeSGerrit Renker 32830833ffeSGerrit Renker /* 32930833ffeSGerrit Renker * Use initial RTT sample when available: recommended by erratum 33030833ffeSGerrit Renker * to RFC 4342. This implements the initialisation procedure of 33130833ffeSGerrit Renker * draft rfc3448bis, section 4.2. Remember, X is scaled by 2^6. 33230833ffeSGerrit Renker */ 33330833ffeSGerrit Renker if (dp->dccps_syn_rtt) { 33430833ffeSGerrit Renker ccid3_pr_debug("SYN RTT = %uus\n", dp->dccps_syn_rtt); 33530833ffeSGerrit Renker hctx->ccid3hctx_rtt = dp->dccps_syn_rtt; 33630833ffeSGerrit Renker hctx->ccid3hctx_x = rfc3390_initial_rate(sk); 33723f062afSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 33830833ffeSGerrit Renker } else { 33930833ffeSGerrit Renker /* Sender does not have RTT sample: X = MSS/second */ 34030833ffeSGerrit Renker hctx->ccid3hctx_x = dp->dccps_mss_cache; 34130833ffeSGerrit Renker hctx->ccid3hctx_x <<= 6; 34230833ffeSGerrit Renker } 34330833ffeSGerrit Renker ccid3_update_send_interval(hctx); 34430833ffeSGerrit Renker 34530833ffeSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3467c657876SArnaldo Carvalho de Melo break; 3477c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3487c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 3498132da4dSGerrit Renker delay = ktime_us_delta(hctx->ccid3hctx_t_nom, now); 3508699be7dSIan McDonald ccid3_pr_debug("delay=%ld\n", (long)delay); 35191cf5a17SGerrit Renker /* 35291cf5a17SGerrit Renker * Scheduling of packet transmissions [RFC 3448, 4.6] 35391cf5a17SGerrit Renker * 35491cf5a17SGerrit Renker * if (t_now > t_nom - delta) 35591cf5a17SGerrit Renker * // send the packet now 35691cf5a17SGerrit Renker * else 35791cf5a17SGerrit Renker * // send the packet in (t_nom - t_now) milliseconds. 35891cf5a17SGerrit Renker */ 35949d66a70SGerrit Renker if (delay - (s64)hctx->ccid3hctx_delta >= 1000) 3608132da4dSGerrit Renker return (u32)delay / 1000L; 3619f8681dbSGerrit Renker 3628132da4dSGerrit Renker ccid3_hc_tx_update_win_count(hctx, now); 3637c657876SArnaldo Carvalho de Melo break; 36459348b19SGerrit Renker case TFRC_SSTATE_TERM: 365a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 3667da7f456SGerrit Renker return -EINVAL; 3677c657876SArnaldo Carvalho de Melo } 3687c657876SArnaldo Carvalho de Melo 3697da7f456SGerrit Renker /* prepare to send now (add options etc.) */ 370507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 371e312d100SGerrit Renker DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 3720c150efbSGerrit Renker hctx->ccid3hctx_idle = 0; 373e312d100SGerrit Renker 374e312d100SGerrit Renker /* set the nominal send time for the next following packet */ 3758132da4dSGerrit Renker hctx->ccid3hctx_t_nom = ktime_add_us(hctx->ccid3hctx_t_nom, 3768132da4dSGerrit Renker hctx->ccid3hctx_t_ipi); 3777da7f456SGerrit Renker return 0; 3787c657876SArnaldo Carvalho de Melo } 3797c657876SArnaldo Carvalho de Melo 3808109b02bSArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, 3818109b02bSArnaldo Carvalho de Melo unsigned int len) 3827c657876SArnaldo Carvalho de Melo { 38359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3846b57c93dSGerrit Renker struct dccp_tx_hist_entry *packet; 3857c657876SArnaldo Carvalho de Melo 38678ad713dSGerrit Renker ccid3_hc_tx_update_s(hctx, len); 38778ad713dSGerrit Renker 388c5a1ae9aSGerrit Renker packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC); 38959d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 390c5a1ae9aSGerrit Renker DCCP_CRIT("packet history - out of memory!"); 3917c657876SArnaldo Carvalho de Melo return; 3927c657876SArnaldo Carvalho de Melo } 393c5a1ae9aSGerrit Renker dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, packet); 394c5a1ae9aSGerrit Renker 3950740d49cSArnaldo Carvalho de Melo packet->dccphtx_tstamp = ktime_get_real(); 396c5a1ae9aSGerrit Renker packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss; 397c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 3988c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 3997c657876SArnaldo Carvalho de Melo } 4007c657876SArnaldo Carvalho de Melo 4017c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 4027c657876SArnaldo Carvalho de Melo { 40359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 4047c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4058c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 4060740d49cSArnaldo Carvalho de Melo ktime_t now; 4072a1fda6fSGerrit Renker unsigned long t_nfb; 4087dfee1a9SGerrit Renker u32 pinv, r_sample; 4091f2333aeSArnaldo Carvalho de Melo 4107c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4117c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4127c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4137c657876SArnaldo Carvalho de Melo return; 4147c657876SArnaldo Carvalho de Melo 4157c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4167c657876SArnaldo Carvalho de Melo 4177c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4187c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4197c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4205c3fbb6aSGerrit Renker /* get packet from history to look up t_recvdata */ 4218c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4228c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 42359d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 4245c3fbb6aSGerrit Renker DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " 42559348b19SGerrit Renker "in history!\n", dccp_role(sk), sk, 42659d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4277c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4287c657876SArnaldo Carvalho de Melo return; 4297c657876SArnaldo Carvalho de Melo } 4307c657876SArnaldo Carvalho de Melo 4311a21e49aSGerrit Renker /* Update receive rate in units of 64 * bytes/second */ 4329e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; 4339e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 6; 4345c3fbb6aSGerrit Renker 4355c3fbb6aSGerrit Renker /* Update loss event rate */ 4365c3fbb6aSGerrit Renker pinv = opt_recv->ccid3or_loss_event_rate; 43745393a66SGerrit Renker if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ 4385c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 0; 43945393a66SGerrit Renker else /* can not exceed 100% */ 4405c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 1000000 / pinv; 4415c3fbb6aSGerrit Renker 4429823b7b5SArnaldo Carvalho de Melo now = ktime_get_real(); 4435c3fbb6aSGerrit Renker /* 4445c3fbb6aSGerrit Renker * Calculate new round trip sample as per [RFC 3448, 4.3] by 4455c3fbb6aSGerrit Renker * R_sample = (now - t_recvdata) - t_elapsed 4465c3fbb6aSGerrit Renker */ 4473393da82SGerrit Renker r_sample = dccp_sample_rtt(sk, ktime_us_delta(now, packet->dccphtx_tstamp)); 4485c3fbb6aSGerrit Renker 4497dfee1a9SGerrit Renker /* 4507dfee1a9SGerrit Renker * Update RTT estimate by 4517c657876SArnaldo Carvalho de Melo * If (No feedback recv) 4527c657876SArnaldo Carvalho de Melo * R = R_sample; 4537c657876SArnaldo Carvalho de Melo * Else 4547c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 4557c657876SArnaldo Carvalho de Melo * 4567c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 4577c657876SArnaldo Carvalho de Melo */ 4587c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 4591a21e49aSGerrit Renker /* 4601a21e49aSGerrit Renker * Larger Initial Windows [RFC 4342, sec. 5] 4611a21e49aSGerrit Renker */ 4627c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 463a21f9f96SGerrit Renker hctx->ccid3hctx_x = rfc3390_initial_rate(sk); 4649823b7b5SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 465a79ef76fSGerrit Renker 4661266adeeSGerrit Renker ccid3_update_send_interval(hctx); 4675c3fbb6aSGerrit Renker 468a21f9f96SGerrit Renker ccid3_pr_debug("%s(%p), s=%u, MSS=%u, " 4697dfee1a9SGerrit Renker "R_sample=%uus, X=%u\n", dccp_role(sk), 4700f08461eSAndrew Morton sk, hctx->ccid3hctx_s, 4711b07a95aSDavid S. Miller dccp_sk(sk)->dccps_mss_cache, r_sample, 4721a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4735c3fbb6aSGerrit Renker 474a79ef76fSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 475a79ef76fSGerrit Renker } else { 4765c3fbb6aSGerrit Renker hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + 4777dfee1a9SGerrit Renker r_sample) / 10; 4785c3fbb6aSGerrit Renker 479ff586298SGerrit Renker /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ 480ff586298SGerrit Renker if (hctx->ccid3hctx_p > 0) 481ff586298SGerrit Renker hctx->ccid3hctx_x_calc = 482ff586298SGerrit Renker tfrc_calc_x(hctx->ccid3hctx_s, 483ff586298SGerrit Renker hctx->ccid3hctx_rtt, 484ff586298SGerrit Renker hctx->ccid3hctx_p); 485aa97efd9SGerrit Renker ccid3_hc_tx_update_x(sk, &now); 4867c657876SArnaldo Carvalho de Melo 4877dfee1a9SGerrit Renker ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, " 4888109b02bSArnaldo Carvalho de Melo "p=%u, X_calc=%u, X_recv=%u, X=%u\n", 4898109b02bSArnaldo Carvalho de Melo dccp_role(sk), 4907dfee1a9SGerrit Renker sk, hctx->ccid3hctx_rtt, r_sample, 4915c3fbb6aSGerrit Renker hctx->ccid3hctx_s, hctx->ccid3hctx_p, 4925c3fbb6aSGerrit Renker hctx->ccid3hctx_x_calc, 4939e8efc82SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6), 4941a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4957c657876SArnaldo Carvalho de Melo } 4967c657876SArnaldo Carvalho de Melo 4977c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 4987c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 4997c657876SArnaldo Carvalho de Melo 5007c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5018c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5028c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 503c530cfb1SArnaldo Carvalho de Melo /* 5048109b02bSArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible 5058109b02bSArnaldo Carvalho de Melo * that we now can send a packet, so wake up dccp_wait_for_ccid 506c530cfb1SArnaldo Carvalho de Melo */ 507c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5088c60f3faSArnaldo Carvalho de Melo 5098a508ac2SGerrit Renker /* 5108a508ac2SGerrit Renker * Update timeout interval for the nofeedback timer. 5118a508ac2SGerrit Renker * We use a configuration option to increase the lower bound. 5128109b02bSArnaldo Carvalho de Melo * This can help avoid triggering the nofeedback timer too 5138109b02bSArnaldo Carvalho de Melo * often ('spinning') on LANs with small RTTs. 5148a508ac2SGerrit Renker */ 5155d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 5168a508ac2SGerrit Renker CONFIG_IP_DCCP_CCID3_RTO * 5178a508ac2SGerrit Renker (USEC_PER_SEC/1000)); 5181f2333aeSArnaldo Carvalho de Melo /* 5191f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5208a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 5211f2333aeSArnaldo Carvalho de Melo */ 5228a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 5237c657876SArnaldo Carvalho de Melo 524a9672411SGerrit Renker ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " 5258109b02bSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5268109b02bSArnaldo Carvalho de Melo dccp_role(sk), 527a9672411SGerrit Renker sk, usecs_to_jiffies(t_nfb), t_nfb); 5287c657876SArnaldo Carvalho de Melo 5297c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5302a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 5317c657876SArnaldo Carvalho de Melo 5327c657876SArnaldo Carvalho de Melo /* set idle flag */ 5337c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5347c657876SArnaldo Carvalho de Melo break; 535151a9931SGerrit Renker case TFRC_SSTATE_NO_SENT: /* fall through */ 5365e19e3fcSGerrit Renker case TFRC_SSTATE_TERM: /* ignore feedback when closing */ 5377c657876SArnaldo Carvalho de Melo break; 5387c657876SArnaldo Carvalho de Melo } 5397c657876SArnaldo Carvalho de Melo } 5407c657876SArnaldo Carvalho de Melo 5417c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5421f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5431f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5447c657876SArnaldo Carvalho de Melo { 5457c657876SArnaldo Carvalho de Melo int rc = 0; 54659725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 54759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5487c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 54976fd1e87SGerrit Renker __be32 opt_val; 5507c657876SArnaldo Carvalho de Melo 5517c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5527c657876SArnaldo Carvalho de Melo 5537c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5547c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5557c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5567c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5577c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5587c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5597c657876SArnaldo Carvalho de Melo } 5607c657876SArnaldo Carvalho de Melo 5617c657876SArnaldo Carvalho de Melo switch (option) { 5627c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 56359d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 564a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 56559348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 56659348b19SGerrit Renker dccp_role(sk), sk, len); 5677c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5687c657876SArnaldo Carvalho de Melo } else { 56976fd1e87SGerrit Renker opt_val = get_unaligned((__be32 *)value); 57076fd1e87SGerrit Renker opt_recv->ccid3or_loss_event_rate = ntohl(opt_val); 571a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", 5727c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5737c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 5747c657876SArnaldo Carvalho de Melo } 5757c657876SArnaldo Carvalho de Melo break; 5767c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 5777c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 5787c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 579a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n", 5807c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5817c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 5827c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 5837c657876SArnaldo Carvalho de Melo break; 5847c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 58559d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 586a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 58759348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 58859348b19SGerrit Renker dccp_role(sk), sk, len); 5897c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5907c657876SArnaldo Carvalho de Melo } else { 59176fd1e87SGerrit Renker opt_val = get_unaligned((__be32 *)value); 59276fd1e87SGerrit Renker opt_recv->ccid3or_receive_rate = ntohl(opt_val); 593a9672411SGerrit Renker ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", 5947c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5957c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 5967c657876SArnaldo Carvalho de Melo } 5977c657876SArnaldo Carvalho de Melo break; 5987c657876SArnaldo Carvalho de Melo } 5997c657876SArnaldo Carvalho de Melo 6007c657876SArnaldo Carvalho de Melo return rc; 6017c657876SArnaldo Carvalho de Melo } 6027c657876SArnaldo Carvalho de Melo 60391f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 6047c657876SArnaldo Carvalho de Melo { 60591f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 6067c657876SArnaldo Carvalho de Melo 6077c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6087c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 609b24b8a24SPavel Emelyanov setup_timer(&hctx->ccid3hctx_no_feedback_timer, 610b24b8a24SPavel Emelyanov ccid3_hc_tx_no_feedback_timer, (unsigned long)sk); 6117c657876SArnaldo Carvalho de Melo 6127c657876SArnaldo Carvalho de Melo return 0; 6137c657876SArnaldo Carvalho de Melo } 6147c657876SArnaldo Carvalho de Melo 6157c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6167c657876SArnaldo Carvalho de Melo { 61759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6187c657876SArnaldo Carvalho de Melo 6197c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6207c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6217c657876SArnaldo Carvalho de Melo 6227c657876SArnaldo Carvalho de Melo /* Empty packet history */ 6238c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 6247c657876SArnaldo Carvalho de Melo } 6257c657876SArnaldo Carvalho de Melo 6269bf17475SGerrit Renker static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 6279bf17475SGerrit Renker { 6282e86908fSGerrit Renker struct ccid3_hc_tx_sock *hctx; 6297c657876SArnaldo Carvalho de Melo 6309bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6319bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6329bf17475SGerrit Renker return; 6339bf17475SGerrit Renker 6342e86908fSGerrit Renker hctx = ccid3_hc_tx_sk(sk); 6359bf17475SGerrit Renker info->tcpi_rto = hctx->ccid3hctx_t_rto; 6369bf17475SGerrit Renker info->tcpi_rtt = hctx->ccid3hctx_rtt; 6379bf17475SGerrit Renker } 6389bf17475SGerrit Renker 6399bf17475SGerrit Renker static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 6409bf17475SGerrit Renker u32 __user *optval, int __user *optlen) 6419bf17475SGerrit Renker { 6422e86908fSGerrit Renker const struct ccid3_hc_tx_sock *hctx; 6439bf17475SGerrit Renker const void *val; 6449bf17475SGerrit Renker 6459bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6469bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6479bf17475SGerrit Renker return -EINVAL; 6489bf17475SGerrit Renker 6492e86908fSGerrit Renker hctx = ccid3_hc_tx_sk(sk); 6509bf17475SGerrit Renker switch (optname) { 6519bf17475SGerrit Renker case DCCP_SOCKOPT_CCID_TX_INFO: 6529bf17475SGerrit Renker if (len < sizeof(hctx->ccid3hctx_tfrc)) 6539bf17475SGerrit Renker return -EINVAL; 6549bf17475SGerrit Renker len = sizeof(hctx->ccid3hctx_tfrc); 6559bf17475SGerrit Renker val = &hctx->ccid3hctx_tfrc; 6569bf17475SGerrit Renker break; 6579bf17475SGerrit Renker default: 6589bf17475SGerrit Renker return -ENOPROTOOPT; 6599bf17475SGerrit Renker } 6609bf17475SGerrit Renker 6619bf17475SGerrit Renker if (put_user(len, optlen) || copy_to_user(optval, val, len)) 6629bf17475SGerrit Renker return -EFAULT; 6639bf17475SGerrit Renker 6649bf17475SGerrit Renker return 0; 6659bf17475SGerrit Renker } 6669bf17475SGerrit Renker 6679bf17475SGerrit Renker /* 6689bf17475SGerrit Renker * Receiver Half-Connection Routines 6699bf17475SGerrit Renker */ 67056724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6717c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6727c657876SArnaldo Carvalho de Melo { 6737c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6747c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6757c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6767c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6777c657876SArnaldo Carvalho de Melo }; 6787c657876SArnaldo Carvalho de Melo 6797c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6807c657876SArnaldo Carvalho de Melo } 6817c657876SArnaldo Carvalho de Melo #endif 6827c657876SArnaldo Carvalho de Melo 683c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 6841f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 6857c657876SArnaldo Carvalho de Melo { 68659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6877c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 6887c657876SArnaldo Carvalho de Melo 6897c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 6901f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 6911f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 6927c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 6937c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 6947c657876SArnaldo Carvalho de Melo } 6957c657876SArnaldo Carvalho de Melo 69678ad713dSGerrit Renker static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) 69778ad713dSGerrit Renker { 69878ad713dSGerrit Renker if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ 69978ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 70078ad713dSGerrit Renker else 70178ad713dSGerrit Renker hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : 70278ad713dSGerrit Renker (9 * hcrx->ccid3hcrx_s + len) / 10; 70378ad713dSGerrit Renker } 70478ad713dSGerrit Renker 7057c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 7067c657876SArnaldo Carvalho de Melo { 70759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7087c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 7098c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 710e7c23357SArnaldo Carvalho de Melo ktime_t now; 7110f9e5b57SGerrit Renker suseconds_t delta; 7127c657876SArnaldo Carvalho de Melo 713a9672411SGerrit Renker ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk), sk); 7147c657876SArnaldo Carvalho de Melo 715e7a81c6dSArnaldo Carvalho de Melo now = ktime_get_real(); 716b6ee3d4aSArnaldo Carvalho de Melo 7177c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 7187c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 7197c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 7207c657876SArnaldo Carvalho de Melo break; 7210f9e5b57SGerrit Renker case TFRC_RSTATE_DATA: 722e7a81c6dSArnaldo Carvalho de Melo delta = ktime_us_delta(now, 723e7a81c6dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback); 7240f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 725b9039a2aSGerrit Renker hcrx->ccid3hcrx_x_recv = 726b9039a2aSGerrit Renker scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 7277c657876SArnaldo Carvalho de Melo break; 72859348b19SGerrit Renker case TFRC_RSTATE_TERM: 729a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 7307c657876SArnaldo Carvalho de Melo return; 7317c657876SArnaldo Carvalho de Melo } 7327c657876SArnaldo Carvalho de Melo 7338c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 73459d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 735a9672411SGerrit Renker DCCP_WARN("%s(%p), no data packet in history!\n", 73659348b19SGerrit Renker dccp_role(sk), sk); 7377c657876SArnaldo Carvalho de Melo return; 7387c657876SArnaldo Carvalho de Melo } 7397c657876SArnaldo Carvalho de Melo 740b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 74166a377c5SIan McDonald hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; 7427c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7437c657876SArnaldo Carvalho de Melo 7440f9e5b57SGerrit Renker /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */ 745e7c23357SArnaldo Carvalho de Melo delta = ktime_us_delta(now, packet->dccphrx_tstamp); 7460f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 7470f9e5b57SGerrit Renker hcrx->ccid3hcrx_elapsed_time = delta / 10; 74845393a66SGerrit Renker 7497c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 75045393a66SGerrit Renker hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ 75145393a66SGerrit Renker else if (hcrx->ccid3hcrx_p > 1000000) { 75245393a66SGerrit Renker DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); 75345393a66SGerrit Renker hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ 75445393a66SGerrit Renker } else 7557c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 75645393a66SGerrit Renker 757507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7587c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7597c657876SArnaldo Carvalho de Melo } 7607c657876SArnaldo Carvalho de Melo 7612d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7627c657876SArnaldo Carvalho de Melo { 7632e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 76460fe62e7SAndrea Bittau __be32 x_recv, pinv; 7657c657876SArnaldo Carvalho de Melo 76659d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7672d0817d1SArnaldo Carvalho de Melo return 0; 7687c657876SArnaldo Carvalho de Melo 7692e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 77066a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 7714fded33bSArnaldo Carvalho de Melo 7724fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7732d0817d1SArnaldo Carvalho de Melo return 0; 7744fded33bSArnaldo Carvalho de Melo 7754fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7764fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7772d0817d1SArnaldo Carvalho de Melo 7782d0817d1SArnaldo Carvalho de Melo if ((hcrx->ccid3hcrx_elapsed_time != 0 && 7792d0817d1SArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 7802d0817d1SArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time)) || 7812d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb) || 7824fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7832d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7844fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 7852d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 7862d0817d1SArnaldo Carvalho de Melo return -1; 7872d0817d1SArnaldo Carvalho de Melo 7882d0817d1SArnaldo Carvalho de Melo return 0; 7897c657876SArnaldo Carvalho de Melo } 7907c657876SArnaldo Carvalho de Melo 79166a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 79266a377c5SIan McDonald struct dccp_rx_hist_entry *packet) 7937c657876SArnaldo Carvalho de Melo { 79459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7958109b02bSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *rx_hist = 7968109b02bSArnaldo Carvalho de Melo dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); 79766a377c5SIan McDonald u64 seqno = packet->dccphrx_seqno; 79866a377c5SIan McDonald u64 tmp_seqno; 79966a377c5SIan McDonald int loss = 0; 80066a377c5SIan McDonald u8 ccval; 8017c657876SArnaldo Carvalho de Melo 80266a377c5SIan McDonald 80366a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 80466a377c5SIan McDonald 80566a377c5SIan McDonald if (!rx_hist || 80666a377c5SIan McDonald follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 80766a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 80866a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 80966a377c5SIan McDonald goto detect_out; 81066a377c5SIan McDonald } 81166a377c5SIan McDonald 81266a377c5SIan McDonald 81366a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 81466a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 81566a377c5SIan McDonald loss = 1; 816cc4d6a3aSArnaldo Carvalho de Melo dccp_li_update_li(sk, 817d83258a3SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, 818d83258a3SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_hist, 819e7c23357SArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback, 820d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s, 821d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv, 822d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv, 823d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_seqno_nonloss, 82466a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 82566a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 82666a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 82766a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 82866a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 82966a377c5SIan McDonald while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 83066a377c5SIan McDonald tmp_seqno, &ccval)) { 83166a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 83266a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 83366a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 83466a377c5SIan McDonald } 83566a377c5SIan McDonald } 83666a377c5SIan McDonald 83766a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 83866a377c5SIan McDonald /* but works at moment */ 83966a377c5SIan McDonald if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 84066a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 84166a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 84266a377c5SIan McDonald } 84366a377c5SIan McDonald 84466a377c5SIan McDonald detect_out: 84566a377c5SIan McDonald dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 84666a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 84766a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 84866a377c5SIan McDonald return loss; 8497c657876SArnaldo Carvalho de Melo } 8507c657876SArnaldo Carvalho de Melo 8517c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 8527c657876SArnaldo Carvalho de Melo { 85359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 8544fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 8558c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 8567dfee1a9SGerrit Renker u32 p_prev, r_sample, rtt_prev; 85778ad713dSGerrit Renker int loss, payload_size; 8589823b7b5SArnaldo Carvalho de Melo ktime_t now; 8591f2333aeSArnaldo Carvalho de Melo 86059725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 8614fded33bSArnaldo Carvalho de Melo 8627c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 8637c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 8647c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 8657c657876SArnaldo Carvalho de Melo return; 8669823b7b5SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 8674fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 8687c657876SArnaldo Carvalho de Melo break; 8693393da82SGerrit Renker r_sample = dccp_timestamp() - opt_recv->dccpor_timestamp_echo; 87066a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 8713393da82SGerrit Renker r_sample = dccp_sample_rtt(sk, 10 * r_sample); 872b3a3077dSArnaldo Carvalho de Melo 873b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 874b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 875b3a3077dSArnaldo Carvalho de Melo else 876b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 877b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 878b3a3077dSArnaldo Carvalho de Melo 87966a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 880a9672411SGerrit Renker ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n", 881a9672411SGerrit Renker dccp_role(sk), sk, hcrx->ccid3hcrx_rtt, 8824fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 8837c657876SArnaldo Carvalho de Melo break; 8847c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 8857c657876SArnaldo Carvalho de Melo break; 88659d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 8877c657876SArnaldo Carvalho de Melo return; 8887c657876SArnaldo Carvalho de Melo } 8897c657876SArnaldo Carvalho de Melo 890e7c23357SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, opt_recv->dccpor_ndp, 89154e6ecb2SChristoph Lameter skb, GFP_ATOMIC); 89259d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 893a9672411SGerrit Renker DCCP_WARN("%s(%p), Not enough mem to add rx packet " 89459348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 8957c657876SArnaldo Carvalho de Melo return; 8967c657876SArnaldo Carvalho de Melo } 8977c657876SArnaldo Carvalho de Melo 89866a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 8997c657876SArnaldo Carvalho de Melo 9007c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 9017c657876SArnaldo Carvalho de Melo return; 9027c657876SArnaldo Carvalho de Melo 90378ad713dSGerrit Renker payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; 90478ad713dSGerrit Renker ccid3_hc_rx_update_s(hcrx, payload_size); 90578ad713dSGerrit Renker 9067c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 9077c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 908a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial " 909a9672411SGerrit Renker "feedback\n", dccp_role(sk), sk, 9101f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 9117c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 9127c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 9137c657876SArnaldo Carvalho de Melo return; 9149823b7b5SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 91578ad713dSGerrit Renker hcrx->ccid3hcrx_bytes_recv += payload_size; 91666a377c5SIan McDonald if (loss) 917b6ee3d4aSArnaldo Carvalho de Melo break; 918b6ee3d4aSArnaldo Carvalho de Melo 9191faf0a1fSArnaldo Carvalho de Melo now = ktime_get_real(); 9201faf0a1fSArnaldo Carvalho de Melo if ((ktime_us_delta(now, hcrx->ccid3hcrx_tstamp_last_ack) - 9211faf0a1fSArnaldo Carvalho de Melo (s64)hcrx->ccid3hcrx_rtt) >= 0) { 922b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 9237c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 9247c657876SArnaldo Carvalho de Melo } 9257c657876SArnaldo Carvalho de Melo return; 92659348b19SGerrit Renker case TFRC_RSTATE_TERM: 927a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 9287c657876SArnaldo Carvalho de Melo return; 9297c657876SArnaldo Carvalho de Melo } 9307c657876SArnaldo Carvalho de Melo 9317c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 932a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n", 9334fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 9347c657876SArnaldo Carvalho de Melo 9357c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 9367c657876SArnaldo Carvalho de Melo 9377c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 938c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 939c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 940c0996660SIan McDonald 9417c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 942c0996660SIan McDonald if (i_mean != 0) 943c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 94459348b19SGerrit Renker } else 94559348b19SGerrit Renker DCCP_BUG("empty loss history"); 9467c657876SArnaldo Carvalho de Melo 9477c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 9487c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 9497c657876SArnaldo Carvalho de Melo return; 9507c657876SArnaldo Carvalho de Melo } 9517c657876SArnaldo Carvalho de Melo } 9527c657876SArnaldo Carvalho de Melo 95391f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 9547c657876SArnaldo Carvalho de Melo { 95591f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 9567c657876SArnaldo Carvalho de Melo 957a9672411SGerrit Renker ccid3_pr_debug("entry\n"); 9587c657876SArnaldo Carvalho de Melo 9597c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 9607c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 961ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 9621faf0a1fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = 963e7a81c6dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = ktime_get_real(); 9647c657876SArnaldo Carvalho de Melo return 0; 9657c657876SArnaldo Carvalho de Melo } 9667c657876SArnaldo Carvalho de Melo 9677c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 9687c657876SArnaldo Carvalho de Melo { 96959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9707c657876SArnaldo Carvalho de Melo 9717c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 9727c657876SArnaldo Carvalho de Melo 9737c657876SArnaldo Carvalho de Melo /* Empty packet history */ 9748c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 9757c657876SArnaldo Carvalho de Melo 9767c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 977cc4d6a3aSArnaldo Carvalho de Melo dccp_li_hist_purge(&hcrx->ccid3hcrx_li_hist); 9787c657876SArnaldo Carvalho de Melo } 9797c657876SArnaldo Carvalho de Melo 9802babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 9812babe1f6SArnaldo Carvalho de Melo { 9822e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 9832babe1f6SArnaldo Carvalho de Melo 98459c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 98559c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 98659c2353dSArnaldo Carvalho de Melo return; 98759c2353dSArnaldo Carvalho de Melo 9882e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 9892babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 9902babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 9912babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 9922babe1f6SArnaldo Carvalho de Melo } 9932babe1f6SArnaldo Carvalho de Melo 99488f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 99588f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 99688f964dbSArnaldo Carvalho de Melo { 9972e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 99888f964dbSArnaldo Carvalho de Melo const void *val; 99988f964dbSArnaldo Carvalho de Melo 100088f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 100188f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 100288f964dbSArnaldo Carvalho de Melo return -EINVAL; 100388f964dbSArnaldo Carvalho de Melo 10042e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 100588f964dbSArnaldo Carvalho de Melo switch (optname) { 100688f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 100788f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 100888f964dbSArnaldo Carvalho de Melo return -EINVAL; 100988f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 101088f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 101188f964dbSArnaldo Carvalho de Melo break; 101288f964dbSArnaldo Carvalho de Melo default: 101388f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 101488f964dbSArnaldo Carvalho de Melo } 101588f964dbSArnaldo Carvalho de Melo 101688f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 101788f964dbSArnaldo Carvalho de Melo return -EFAULT; 101888f964dbSArnaldo Carvalho de Melo 101988f964dbSArnaldo Carvalho de Melo return 0; 102088f964dbSArnaldo Carvalho de Melo } 102188f964dbSArnaldo Carvalho de Melo 102291f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 10233dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 10247c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 10257c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 102691f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 10277c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 10287c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 10297c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 10307c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 10317c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 10327c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 103391f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 10347c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 10357c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 10367c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 10377c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 10382babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 10392babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 104088f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 104188f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 10427c657876SArnaldo Carvalho de Melo }; 10437c657876SArnaldo Carvalho de Melo 104456724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 1045042d18f9SGerrit Renker module_param(ccid3_debug, bool, 0444); 10467c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 104756724aa4SGerrit Renker #endif 10487c657876SArnaldo Carvalho de Melo 10497c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 10507c657876SArnaldo Carvalho de Melo { 10518c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 10527c657876SArnaldo Carvalho de Melo 10538c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 10548c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 10557c657876SArnaldo Carvalho de Melo goto out; 10567c657876SArnaldo Carvalho de Melo 10578c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 10588c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 10598c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 10607c657876SArnaldo Carvalho de Melo 10617c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 10627c657876SArnaldo Carvalho de Melo if (rc != 0) 1063cc4d6a3aSArnaldo Carvalho de Melo goto out_free_tx; 10647c657876SArnaldo Carvalho de Melo out: 10657c657876SArnaldo Carvalho de Melo return rc; 10668c60f3faSArnaldo Carvalho de Melo 10678c60f3faSArnaldo Carvalho de Melo out_free_tx: 10688c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 10698c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 10708c60f3faSArnaldo Carvalho de Melo out_free_rx: 10718c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 10728c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 10737c657876SArnaldo Carvalho de Melo goto out; 10747c657876SArnaldo Carvalho de Melo } 10757c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 10767c657876SArnaldo Carvalho de Melo 10777c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 10787c657876SArnaldo Carvalho de Melo { 10797c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 10807c657876SArnaldo Carvalho de Melo 10818c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 10828c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 10838c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 10847c657876SArnaldo Carvalho de Melo } 10858c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 10868c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 10878c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 10887c657876SArnaldo Carvalho de Melo } 10897c657876SArnaldo Carvalho de Melo } 10907c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 10917c657876SArnaldo Carvalho de Melo 1092e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 10931f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 10947c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 10957c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 10967c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1097