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 4356724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 4456724aa4SGerrit Renker static int ccid3_debug; 4556724aa4SGerrit Renker #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) 467c657876SArnaldo Carvalho de Melo #else 477c657876SArnaldo Carvalho de Melo #define ccid3_pr_debug(format, a...) 487c657876SArnaldo Carvalho de Melo #endif 497c657876SArnaldo Carvalho de Melo 50a1d3a355SArnaldo Carvalho de Melo static struct dccp_tx_hist *ccid3_tx_hist; 51a1d3a355SArnaldo Carvalho de Melo static struct dccp_rx_hist *ccid3_rx_hist; 527c657876SArnaldo Carvalho de Melo 539bf17475SGerrit Renker /* 549bf17475SGerrit Renker * Transmitter Half-Connection Routines 559bf17475SGerrit Renker */ 5656724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 577c657876SArnaldo Carvalho de Melo static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) 587c657876SArnaldo Carvalho de Melo { 597c657876SArnaldo Carvalho de Melo static char *ccid3_state_names[] = { 607c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_SENT] = "NO_SENT", 617c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", 627c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_FBACK] = "FBACK", 637c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_TERM] = "TERM", 647c657876SArnaldo Carvalho de Melo }; 657c657876SArnaldo Carvalho de Melo 667c657876SArnaldo Carvalho de Melo return ccid3_state_names[state]; 677c657876SArnaldo Carvalho de Melo } 687c657876SArnaldo Carvalho de Melo #endif 697c657876SArnaldo Carvalho de Melo 70c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_tx_set_state(struct sock *sk, 711f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_tx_states state) 727c657876SArnaldo Carvalho de Melo { 7359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 747c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; 757c657876SArnaldo Carvalho de Melo 767c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 771f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_tx_state_name(oldstate), 781f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(state)); 797c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 807c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = state; 817c657876SArnaldo Carvalho de Melo } 827c657876SArnaldo Carvalho de Melo 8317893bc1SGerrit Renker /* 84a21f9f96SGerrit Renker * Compute the initial sending rate X_init according to RFC 3390: 85a21f9f96SGerrit Renker * w_init = min(4 * MSS, max(2 * MSS, 4380 bytes)) 86a21f9f96SGerrit Renker * X_init = w_init / RTT 87a21f9f96SGerrit Renker * For consistency with other parts of the code, X_init is scaled by 2^6. 88a21f9f96SGerrit Renker */ 89a21f9f96SGerrit Renker static inline u64 rfc3390_initial_rate(struct sock *sk) 90a21f9f96SGerrit Renker { 91a21f9f96SGerrit Renker const struct dccp_sock *dp = dccp_sk(sk); 92a21f9f96SGerrit Renker const __u32 w_init = min(4 * dp->dccps_mss_cache, 93a21f9f96SGerrit Renker max(2 * dp->dccps_mss_cache, 4380U)); 94a21f9f96SGerrit Renker 95a21f9f96SGerrit Renker return scaled_div(w_init << 6, ccid3_hc_tx_sk(sk)->ccid3hctx_rtt); 96a21f9f96SGerrit Renker } 97a21f9f96SGerrit Renker 98a21f9f96SGerrit Renker /* 991266adeeSGerrit Renker * Recalculate t_ipi and delta (should be called whenever X changes) 10017893bc1SGerrit Renker */ 1011266adeeSGerrit Renker static inline void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hctx) 1027c657876SArnaldo Carvalho de Melo { 1031a21e49aSGerrit Renker /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */ 104b2449fdcSGerrit Renker hctx->ccid3hctx_t_ipi = scaled_div32(((u64)hctx->ccid3hctx_s) << 6, 105b2449fdcSGerrit Renker hctx->ccid3hctx_x); 10617893bc1SGerrit Renker 1077c657876SArnaldo Carvalho de Melo /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ 1081f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, 1091f2333aeSArnaldo Carvalho de Melo TFRC_OPSYS_HALF_TIME_GRAN); 1108699be7dSIan McDonald 1111761f7d7SGerrit Renker ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n", 1128699be7dSIan McDonald hctx->ccid3hctx_t_ipi, hctx->ccid3hctx_delta, 1131761f7d7SGerrit Renker hctx->ccid3hctx_s, (unsigned)(hctx->ccid3hctx_x >> 6)); 1148699be7dSIan McDonald 1157c657876SArnaldo Carvalho de Melo } 116aa97efd9SGerrit Renker 117aa97efd9SGerrit Renker /** 118aa97efd9SGerrit Renker * ccid3_hc_tx_update_x - Update allowed sending rate X 119aa97efd9SGerrit Renker * @stamp: most recent time if available - can be left NULL. 120aa97efd9SGerrit Renker * This function tracks draft rfc3448bis, check there for latest details. 1215c3fbb6aSGerrit Renker * 1221a21e49aSGerrit Renker * Note: X and X_recv are both stored in units of 64 * bytes/second, to support 1231a21e49aSGerrit Renker * fine-grained resolution of sending rates. This requires scaling by 2^6 1241a21e49aSGerrit Renker * throughout the code. Only X_calc is unscaled (in bytes/second). 1251a21e49aSGerrit Renker * 1267c657876SArnaldo Carvalho de Melo */ 127aa97efd9SGerrit Renker static void ccid3_hc_tx_update_x(struct sock *sk, ktime_t *stamp) 128a79ef76fSGerrit Renker 1297c657876SArnaldo Carvalho de Melo { 13059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1310c150efbSGerrit Renker __u64 min_rate = 2 * hctx->ccid3hctx_x_recv; 1321a21e49aSGerrit Renker const __u64 old_x = hctx->ccid3hctx_x; 133aa97efd9SGerrit Renker ktime_t now = stamp? *stamp : ktime_get_real(); 1347c657876SArnaldo Carvalho de Melo 1350c150efbSGerrit Renker /* 1360c150efbSGerrit Renker * Handle IDLE periods: do not reduce below RFC3390 initial sending rate 1370c150efbSGerrit Renker * when idling [RFC 4342, 5.1]. See also draft-ietf-dccp-rfc3448bis. 1380c150efbSGerrit Renker * For consistency with X and X_recv, min_rate is also scaled by 2^6. 1390c150efbSGerrit Renker */ 1400c150efbSGerrit Renker if (unlikely(hctx->ccid3hctx_idle)) { 1410c150efbSGerrit Renker min_rate = rfc3390_initial_rate(sk); 1420c150efbSGerrit Renker min_rate = max(min_rate, 2 * hctx->ccid3hctx_x_recv); 1430c150efbSGerrit Renker } 1440c150efbSGerrit Renker 14544158306SGerrit Renker if (hctx->ccid3hctx_p > 0) { 1461a21e49aSGerrit Renker 1479e8efc82SGerrit Renker hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6, 1480c150efbSGerrit Renker min_rate); 1499e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, 1509e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 1519e8efc82SGerrit Renker TFRC_T_MBI); 152b6ee3d4aSArnaldo Carvalho de Melo 153aa97efd9SGerrit Renker } else if (ktime_us_delta(now, hctx->ccid3hctx_t_ld) 154aa97efd9SGerrit Renker - (s64)hctx->ccid3hctx_rtt >= 0) { 1551a21e49aSGerrit Renker 1569e8efc82SGerrit Renker hctx->ccid3hctx_x = 1570c150efbSGerrit Renker max(min(2 * hctx->ccid3hctx_x, min_rate), 1589e8efc82SGerrit Renker scaled_div(((__u64)hctx->ccid3hctx_s) << 6, 1596b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 160ac198ea8SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 161ac198ea8SArnaldo Carvalho de Melo } 162a79ef76fSGerrit Renker 1638699be7dSIan McDonald if (hctx->ccid3hctx_x != old_x) { 1641761f7d7SGerrit Renker ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, " 1651761f7d7SGerrit Renker "X_recv=%u\n", (unsigned)(old_x >> 6), 1661761f7d7SGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6), 1671761f7d7SGerrit Renker hctx->ccid3hctx_x_calc, 1681761f7d7SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6)); 1698699be7dSIan McDonald 1701266adeeSGerrit Renker ccid3_update_send_interval(hctx); 1717c657876SArnaldo Carvalho de Melo } 1728699be7dSIan McDonald } 1737c657876SArnaldo Carvalho de Melo 17478ad713dSGerrit Renker /* 17578ad713dSGerrit Renker * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) 17678ad713dSGerrit Renker * @len: DCCP packet payload size in bytes 17778ad713dSGerrit Renker */ 17878ad713dSGerrit Renker static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) 17978ad713dSGerrit Renker { 1801266adeeSGerrit Renker const u16 old_s = hctx->ccid3hctx_s; 1811266adeeSGerrit Renker 1821266adeeSGerrit Renker hctx->ccid3hctx_s = old_s == 0 ? len : (9 * old_s + len) / 10; 1831266adeeSGerrit Renker 1841266adeeSGerrit Renker if (hctx->ccid3hctx_s != old_s) 1851266adeeSGerrit Renker ccid3_update_send_interval(hctx); 18678ad713dSGerrit Renker } 18778ad713dSGerrit Renker 1889f8681dbSGerrit Renker /* 1899f8681dbSGerrit Renker * Update Window Counter using the algorithm from [RFC 4342, 8.1]. 1909f8681dbSGerrit Renker * The algorithm is not applicable if RTT < 4 microseconds. 1919f8681dbSGerrit Renker */ 1929f8681dbSGerrit Renker static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, 1938132da4dSGerrit Renker ktime_t now) 1949f8681dbSGerrit Renker { 1959f8681dbSGerrit Renker u32 quarter_rtts; 1969f8681dbSGerrit Renker 1979f8681dbSGerrit Renker if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ 1989f8681dbSGerrit Renker return; 1999f8681dbSGerrit Renker 2008132da4dSGerrit Renker quarter_rtts = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count); 2018132da4dSGerrit Renker quarter_rtts /= hctx->ccid3hctx_rtt / 4; 2029f8681dbSGerrit Renker 2039f8681dbSGerrit Renker if (quarter_rtts > 0) { 2048132da4dSGerrit Renker hctx->ccid3hctx_t_last_win_count = now; 2059f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); 2069f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ 2079f8681dbSGerrit Renker } 2089f8681dbSGerrit Renker } 2099f8681dbSGerrit Renker 2107c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 2117c657876SArnaldo Carvalho de Melo { 2127c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 21359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2142a1fda6fSGerrit Renker unsigned long t_nfb = USEC_PER_SEC / 5; 2157c657876SArnaldo Carvalho de Melo 2167c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 2177c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 2187c657876SArnaldo Carvalho de Melo /* Try again later. */ 2197c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 22048e03eeeSGerrit Renker goto restart_timer; 2217c657876SArnaldo Carvalho de Melo } 2227c657876SArnaldo Carvalho de Melo 223a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk, 2247c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2257c657876SArnaldo Carvalho de Melo 2260c150efbSGerrit Renker hctx->ccid3hctx_idle = 1; 2270c150efbSGerrit Renker 2287c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 2297c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 230a79ef76fSGerrit Renker /* RFC 3448, 4.4: Halve send rate directly */ 2319e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2, 2329e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2339e8efc82SGerrit Renker TFRC_T_MBI); 2347c657876SArnaldo Carvalho de Melo 235a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u " 236a9672411SGerrit Renker "bytes/s\n", dccp_role(sk), sk, 2371f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 2381a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 23948e03eeeSGerrit Renker /* The value of R is still undefined and so we can not recompute 24048e03eeeSGerrit Renker * the timout value. Keep initial value as per [RFC 4342, 5]. */ 2412a1fda6fSGerrit Renker t_nfb = TFRC_INITIAL_TIMEOUT; 2421266adeeSGerrit Renker ccid3_update_send_interval(hctx); 2437c657876SArnaldo Carvalho de Melo break; 2447c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 2451f2333aeSArnaldo Carvalho de Melo /* 246ff586298SGerrit Renker * Modify the cached value of X_recv [RFC 3448, 4.4] 247ff586298SGerrit Renker * 248ff586298SGerrit Renker * If (p == 0 || X_calc > 2 * X_recv) 2497c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2507c657876SArnaldo Carvalho de Melo * Else 2517c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2521a21e49aSGerrit Renker * 2531a21e49aSGerrit Renker * Note that X_recv is scaled by 2^6 while X_calc is not 2547c657876SArnaldo Carvalho de Melo */ 25544158306SGerrit Renker BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); 2567c657876SArnaldo Carvalho de Melo 25744158306SGerrit Renker if (hctx->ccid3hctx_p == 0 || 2580c150efbSGerrit Renker (hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5))) { 2591a21e49aSGerrit Renker 2601a21e49aSGerrit Renker hctx->ccid3hctx_x_recv = 2619e8efc82SGerrit Renker max(hctx->ccid3hctx_x_recv / 2, 2629e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2631a21e49aSGerrit Renker (2 * TFRC_T_MBI)); 2649e8efc82SGerrit Renker } else { 2659e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc; 2669e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 4; 2679e8efc82SGerrit Renker } 268ff586298SGerrit Renker /* Now recalculate X [RFC 3448, 4.3, step (4)] */ 269aa97efd9SGerrit Renker ccid3_hc_tx_update_x(sk, NULL); 2706b5e633aSArnaldo Carvalho de Melo /* 2716b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2728a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 2738a508ac2SGerrit Renker * See comments in packet_recv() regarding the value of t_RTO. 2746b5e633aSArnaldo Carvalho de Melo */ 2758a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 2767c657876SArnaldo Carvalho de Melo break; 27759348b19SGerrit Renker case TFRC_SSTATE_NO_SENT: 278a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk), sk); 27959348b19SGerrit Renker /* fall through */ 28059348b19SGerrit Renker case TFRC_SSTATE_TERM: 2817c657876SArnaldo Carvalho de Melo goto out; 2827c657876SArnaldo Carvalho de Melo } 2837c657876SArnaldo Carvalho de Melo 28448e03eeeSGerrit Renker restart_timer: 28548e03eeeSGerrit Renker sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2862a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 2877c657876SArnaldo Carvalho de Melo out: 2887c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2897c657876SArnaldo Carvalho de Melo sock_put(sk); 2907c657876SArnaldo Carvalho de Melo } 2917c657876SArnaldo Carvalho de Melo 2927da7f456SGerrit Renker /* 2937da7f456SGerrit Renker * returns 2947da7f456SGerrit Renker * > 0: delay (in msecs) that should pass before actually sending 2957da7f456SGerrit Renker * = 0: can send immediately 2967da7f456SGerrit Renker * < 0: error condition; do not send packet 2977da7f456SGerrit Renker */ 2986b57c93dSGerrit Renker static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) 2997c657876SArnaldo Carvalho de Melo { 3007c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 30159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3028132da4dSGerrit Renker ktime_t now = ktime_get_real(); 3038132da4dSGerrit Renker s64 delay; 3047c657876SArnaldo Carvalho de Melo 3057c657876SArnaldo Carvalho de Melo /* 306da335bafSGerrit Renker * This function is called only for Data and DataAck packets. Sending 307da335bafSGerrit Renker * zero-sized Data(Ack)s is theoretically possible, but for congestion 308da335bafSGerrit Renker * control this case is pathological - ignore it. 3097c657876SArnaldo Carvalho de Melo */ 3106b57c93dSGerrit Renker if (unlikely(skb->len == 0)) 311da335bafSGerrit Renker return -EBADMSG; 3127c657876SArnaldo Carvalho de Melo 3137c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3147c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3151f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3168109b02bSArnaldo Carvalho de Melo (jiffies + 3178109b02bSArnaldo Carvalho de Melo usecs_to_jiffies(TFRC_INITIAL_TIMEOUT))); 3187c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3197c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 32090feeb95SGerrit Renker 32190feeb95SGerrit Renker /* Set t_0 for initial packet */ 3227c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 32330833ffeSGerrit Renker 32430833ffeSGerrit Renker hctx->ccid3hctx_s = skb->len; 32530833ffeSGerrit Renker 32630833ffeSGerrit Renker /* 32730833ffeSGerrit Renker * Use initial RTT sample when available: recommended by erratum 32830833ffeSGerrit Renker * to RFC 4342. This implements the initialisation procedure of 32930833ffeSGerrit Renker * draft rfc3448bis, section 4.2. Remember, X is scaled by 2^6. 33030833ffeSGerrit Renker */ 33130833ffeSGerrit Renker if (dp->dccps_syn_rtt) { 33230833ffeSGerrit Renker ccid3_pr_debug("SYN RTT = %uus\n", dp->dccps_syn_rtt); 33330833ffeSGerrit Renker hctx->ccid3hctx_rtt = dp->dccps_syn_rtt; 33430833ffeSGerrit Renker hctx->ccid3hctx_x = rfc3390_initial_rate(sk); 33523f062afSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 33630833ffeSGerrit Renker } else { 33730833ffeSGerrit Renker /* Sender does not have RTT sample: X = MSS/second */ 33830833ffeSGerrit Renker hctx->ccid3hctx_x = dp->dccps_mss_cache; 33930833ffeSGerrit Renker hctx->ccid3hctx_x <<= 6; 34030833ffeSGerrit Renker } 34130833ffeSGerrit Renker ccid3_update_send_interval(hctx); 34230833ffeSGerrit Renker 34330833ffeSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3447c657876SArnaldo Carvalho de Melo break; 3457c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3467c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 3478132da4dSGerrit Renker delay = ktime_us_delta(hctx->ccid3hctx_t_nom, now); 3488699be7dSIan McDonald ccid3_pr_debug("delay=%ld\n", (long)delay); 34991cf5a17SGerrit Renker /* 35091cf5a17SGerrit Renker * Scheduling of packet transmissions [RFC 3448, 4.6] 35191cf5a17SGerrit Renker * 35291cf5a17SGerrit Renker * if (t_now > t_nom - delta) 35391cf5a17SGerrit Renker * // send the packet now 35491cf5a17SGerrit Renker * else 35591cf5a17SGerrit Renker * // send the packet in (t_nom - t_now) milliseconds. 35691cf5a17SGerrit Renker */ 35749d66a70SGerrit Renker if (delay - (s64)hctx->ccid3hctx_delta >= 1000) 3588132da4dSGerrit Renker return (u32)delay / 1000L; 3599f8681dbSGerrit Renker 3608132da4dSGerrit Renker ccid3_hc_tx_update_win_count(hctx, now); 3617c657876SArnaldo Carvalho de Melo break; 36259348b19SGerrit Renker case TFRC_SSTATE_TERM: 363a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 3647da7f456SGerrit Renker return -EINVAL; 3657c657876SArnaldo Carvalho de Melo } 3667c657876SArnaldo Carvalho de Melo 3677da7f456SGerrit Renker /* prepare to send now (add options etc.) */ 368507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 369e312d100SGerrit Renker DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 3700c150efbSGerrit Renker hctx->ccid3hctx_idle = 0; 371e312d100SGerrit Renker 372e312d100SGerrit Renker /* set the nominal send time for the next following packet */ 3738132da4dSGerrit Renker hctx->ccid3hctx_t_nom = ktime_add_us(hctx->ccid3hctx_t_nom, 3748132da4dSGerrit Renker hctx->ccid3hctx_t_ipi); 3757da7f456SGerrit Renker return 0; 3767c657876SArnaldo Carvalho de Melo } 3777c657876SArnaldo Carvalho de Melo 3788109b02bSArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, 3798109b02bSArnaldo Carvalho de Melo unsigned int len) 3807c657876SArnaldo Carvalho de Melo { 38159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3826b57c93dSGerrit Renker struct dccp_tx_hist_entry *packet; 3837c657876SArnaldo Carvalho de Melo 38478ad713dSGerrit Renker ccid3_hc_tx_update_s(hctx, len); 38578ad713dSGerrit Renker 386c5a1ae9aSGerrit Renker packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC); 38759d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 388c5a1ae9aSGerrit Renker DCCP_CRIT("packet history - out of memory!"); 3897c657876SArnaldo Carvalho de Melo return; 3907c657876SArnaldo Carvalho de Melo } 391c5a1ae9aSGerrit Renker dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, packet); 392c5a1ae9aSGerrit Renker 3930740d49cSArnaldo Carvalho de Melo packet->dccphtx_tstamp = ktime_get_real(); 394c5a1ae9aSGerrit Renker packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss; 395c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 3968c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 3977c657876SArnaldo Carvalho de Melo } 3987c657876SArnaldo Carvalho de Melo 3997c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 4007c657876SArnaldo Carvalho de Melo { 40159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 4027c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4038c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 4040740d49cSArnaldo Carvalho de Melo ktime_t now; 4052a1fda6fSGerrit Renker unsigned long t_nfb; 4067dfee1a9SGerrit Renker u32 pinv, r_sample; 4071f2333aeSArnaldo Carvalho de Melo 4087c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4097c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4107c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4117c657876SArnaldo Carvalho de Melo return; 4127c657876SArnaldo Carvalho de Melo 4137c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4147c657876SArnaldo Carvalho de Melo 4157c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4167c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4177c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4185c3fbb6aSGerrit Renker /* get packet from history to look up t_recvdata */ 4198c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4208c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 42159d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 4225c3fbb6aSGerrit Renker DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " 42359348b19SGerrit Renker "in history!\n", dccp_role(sk), sk, 42459d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4257c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4267c657876SArnaldo Carvalho de Melo return; 4277c657876SArnaldo Carvalho de Melo } 4287c657876SArnaldo Carvalho de Melo 4291a21e49aSGerrit Renker /* Update receive rate in units of 64 * bytes/second */ 4309e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; 4319e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 6; 4325c3fbb6aSGerrit Renker 4335c3fbb6aSGerrit Renker /* Update loss event rate */ 4345c3fbb6aSGerrit Renker pinv = opt_recv->ccid3or_loss_event_rate; 43545393a66SGerrit Renker if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ 4365c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 0; 43745393a66SGerrit Renker else /* can not exceed 100% */ 4385c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 1000000 / pinv; 4395c3fbb6aSGerrit Renker 4409823b7b5SArnaldo Carvalho de Melo now = ktime_get_real(); 4415c3fbb6aSGerrit Renker /* 4425c3fbb6aSGerrit Renker * Calculate new round trip sample as per [RFC 3448, 4.3] by 4435c3fbb6aSGerrit Renker * R_sample = (now - t_recvdata) - t_elapsed 4445c3fbb6aSGerrit Renker */ 4453393da82SGerrit Renker r_sample = dccp_sample_rtt(sk, ktime_us_delta(now, packet->dccphtx_tstamp)); 4465c3fbb6aSGerrit Renker 4477dfee1a9SGerrit Renker /* 4487dfee1a9SGerrit Renker * Update RTT estimate by 4497c657876SArnaldo Carvalho de Melo * If (No feedback recv) 4507c657876SArnaldo Carvalho de Melo * R = R_sample; 4517c657876SArnaldo Carvalho de Melo * Else 4527c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 4537c657876SArnaldo Carvalho de Melo * 4547c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 4557c657876SArnaldo Carvalho de Melo */ 4567c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 4571a21e49aSGerrit Renker /* 4581a21e49aSGerrit Renker * Larger Initial Windows [RFC 4342, sec. 5] 4591a21e49aSGerrit Renker */ 4607c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 461a21f9f96SGerrit Renker hctx->ccid3hctx_x = rfc3390_initial_rate(sk); 4629823b7b5SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 463a79ef76fSGerrit Renker 4641266adeeSGerrit Renker ccid3_update_send_interval(hctx); 4655c3fbb6aSGerrit Renker 466a21f9f96SGerrit Renker ccid3_pr_debug("%s(%p), s=%u, MSS=%u, " 4677dfee1a9SGerrit Renker "R_sample=%uus, X=%u\n", dccp_role(sk), 4680f08461eSAndrew Morton sk, hctx->ccid3hctx_s, 4691b07a95aSDavid S. Miller dccp_sk(sk)->dccps_mss_cache, r_sample, 4701a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4715c3fbb6aSGerrit Renker 472a79ef76fSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 473a79ef76fSGerrit Renker } else { 4745c3fbb6aSGerrit Renker hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + 4757dfee1a9SGerrit Renker r_sample) / 10; 4765c3fbb6aSGerrit Renker 477ff586298SGerrit Renker /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ 478ff586298SGerrit Renker if (hctx->ccid3hctx_p > 0) 479ff586298SGerrit Renker hctx->ccid3hctx_x_calc = 480ff586298SGerrit Renker tfrc_calc_x(hctx->ccid3hctx_s, 481ff586298SGerrit Renker hctx->ccid3hctx_rtt, 482ff586298SGerrit Renker hctx->ccid3hctx_p); 483aa97efd9SGerrit Renker ccid3_hc_tx_update_x(sk, &now); 4847c657876SArnaldo Carvalho de Melo 4857dfee1a9SGerrit Renker ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, " 4868109b02bSArnaldo Carvalho de Melo "p=%u, X_calc=%u, X_recv=%u, X=%u\n", 4878109b02bSArnaldo Carvalho de Melo dccp_role(sk), 4887dfee1a9SGerrit Renker sk, hctx->ccid3hctx_rtt, r_sample, 4895c3fbb6aSGerrit Renker hctx->ccid3hctx_s, hctx->ccid3hctx_p, 4905c3fbb6aSGerrit Renker hctx->ccid3hctx_x_calc, 4919e8efc82SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6), 4921a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4937c657876SArnaldo Carvalho de Melo } 4947c657876SArnaldo Carvalho de Melo 4957c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 4967c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 4977c657876SArnaldo Carvalho de Melo 4987c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 4998c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5008c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 501c530cfb1SArnaldo Carvalho de Melo /* 5028109b02bSArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible 5038109b02bSArnaldo Carvalho de Melo * that we now can send a packet, so wake up dccp_wait_for_ccid 504c530cfb1SArnaldo Carvalho de Melo */ 505c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5068c60f3faSArnaldo Carvalho de Melo 5078a508ac2SGerrit Renker /* 5088a508ac2SGerrit Renker * Update timeout interval for the nofeedback timer. 5098a508ac2SGerrit Renker * We use a configuration option to increase the lower bound. 5108109b02bSArnaldo Carvalho de Melo * This can help avoid triggering the nofeedback timer too 5118109b02bSArnaldo Carvalho de Melo * often ('spinning') on LANs with small RTTs. 5128a508ac2SGerrit Renker */ 5135d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 5148a508ac2SGerrit Renker CONFIG_IP_DCCP_CCID3_RTO * 5158a508ac2SGerrit Renker (USEC_PER_SEC/1000)); 5161f2333aeSArnaldo Carvalho de Melo /* 5171f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5188a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 5191f2333aeSArnaldo Carvalho de Melo */ 5208a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 5217c657876SArnaldo Carvalho de Melo 522a9672411SGerrit Renker ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " 5238109b02bSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5248109b02bSArnaldo Carvalho de Melo dccp_role(sk), 525a9672411SGerrit Renker sk, usecs_to_jiffies(t_nfb), t_nfb); 5267c657876SArnaldo Carvalho de Melo 5277c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5282a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 5297c657876SArnaldo Carvalho de Melo 5307c657876SArnaldo Carvalho de Melo /* set idle flag */ 5317c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5327c657876SArnaldo Carvalho de Melo break; 533151a9931SGerrit Renker case TFRC_SSTATE_NO_SENT: /* fall through */ 5345e19e3fcSGerrit Renker case TFRC_SSTATE_TERM: /* ignore feedback when closing */ 5357c657876SArnaldo Carvalho de Melo break; 5367c657876SArnaldo Carvalho de Melo } 5377c657876SArnaldo Carvalho de Melo } 5387c657876SArnaldo Carvalho de Melo 5397c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5401f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5411f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5427c657876SArnaldo Carvalho de Melo { 5437c657876SArnaldo Carvalho de Melo int rc = 0; 54459725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 54559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5467c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 5477c657876SArnaldo Carvalho de Melo 5487c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5497c657876SArnaldo Carvalho de Melo 5507c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5517c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5527c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5537c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5547c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5557c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5567c657876SArnaldo Carvalho de Melo } 5577c657876SArnaldo Carvalho de Melo 5587c657876SArnaldo Carvalho de Melo switch (option) { 5597c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 56059d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 561a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 56259348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 56359348b19SGerrit Renker dccp_role(sk), sk, len); 5647c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5657c657876SArnaldo Carvalho de Melo } else { 5668109b02bSArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = 5678109b02bSArnaldo Carvalho de Melo ntohl(*(__be32 *)value); 568a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", 5697c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5707c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 5717c657876SArnaldo Carvalho de Melo } 5727c657876SArnaldo Carvalho de Melo break; 5737c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 5747c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 5757c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 576a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n", 5777c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5787c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 5797c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 5807c657876SArnaldo Carvalho de Melo break; 5817c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 58259d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 583a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 58459348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 58559348b19SGerrit Renker dccp_role(sk), sk, len); 5867c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5877c657876SArnaldo Carvalho de Melo } else { 5888109b02bSArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 5898109b02bSArnaldo Carvalho de Melo ntohl(*(__be32 *)value); 590a9672411SGerrit Renker ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", 5917c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5927c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 5937c657876SArnaldo Carvalho de Melo } 5947c657876SArnaldo Carvalho de Melo break; 5957c657876SArnaldo Carvalho de Melo } 5967c657876SArnaldo Carvalho de Melo 5977c657876SArnaldo Carvalho de Melo return rc; 5987c657876SArnaldo Carvalho de Melo } 5997c657876SArnaldo Carvalho de Melo 60091f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 6017c657876SArnaldo Carvalho de Melo { 60291f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 6037c657876SArnaldo Carvalho de Melo 60478ad713dSGerrit Renker hctx->ccid3hctx_s = 0; 605fe0499aeSGerrit Renker hctx->ccid3hctx_rtt = 0; 6067c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6077c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 608aa5d7df3SArnaldo Carvalho de Melo 6098109b02bSArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = 6108109b02bSArnaldo Carvalho de Melo ccid3_hc_tx_no_feedback_timer; 611aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 6127c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6137c657876SArnaldo Carvalho de Melo 6147c657876SArnaldo Carvalho de Melo return 0; 6157c657876SArnaldo Carvalho de Melo } 6167c657876SArnaldo Carvalho de Melo 6177c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6187c657876SArnaldo Carvalho de Melo { 61959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6207c657876SArnaldo Carvalho de Melo 6217c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6227c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6237c657876SArnaldo Carvalho de Melo 6247c657876SArnaldo Carvalho de Melo /* Empty packet history */ 6258c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 6267c657876SArnaldo Carvalho de Melo } 6277c657876SArnaldo Carvalho de Melo 6289bf17475SGerrit Renker static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 6299bf17475SGerrit Renker { 6302e86908fSGerrit Renker struct ccid3_hc_tx_sock *hctx; 6317c657876SArnaldo Carvalho de Melo 6329bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6339bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6349bf17475SGerrit Renker return; 6359bf17475SGerrit Renker 6362e86908fSGerrit Renker hctx = ccid3_hc_tx_sk(sk); 6379bf17475SGerrit Renker info->tcpi_rto = hctx->ccid3hctx_t_rto; 6389bf17475SGerrit Renker info->tcpi_rtt = hctx->ccid3hctx_rtt; 6399bf17475SGerrit Renker } 6409bf17475SGerrit Renker 6419bf17475SGerrit Renker static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 6429bf17475SGerrit Renker u32 __user *optval, int __user *optlen) 6439bf17475SGerrit Renker { 6442e86908fSGerrit Renker const struct ccid3_hc_tx_sock *hctx; 6459bf17475SGerrit Renker const void *val; 6469bf17475SGerrit Renker 6479bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6489bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6499bf17475SGerrit Renker return -EINVAL; 6509bf17475SGerrit Renker 6512e86908fSGerrit Renker hctx = ccid3_hc_tx_sk(sk); 6529bf17475SGerrit Renker switch (optname) { 6539bf17475SGerrit Renker case DCCP_SOCKOPT_CCID_TX_INFO: 6549bf17475SGerrit Renker if (len < sizeof(hctx->ccid3hctx_tfrc)) 6559bf17475SGerrit Renker return -EINVAL; 6569bf17475SGerrit Renker len = sizeof(hctx->ccid3hctx_tfrc); 6579bf17475SGerrit Renker val = &hctx->ccid3hctx_tfrc; 6589bf17475SGerrit Renker break; 6599bf17475SGerrit Renker default: 6609bf17475SGerrit Renker return -ENOPROTOOPT; 6619bf17475SGerrit Renker } 6629bf17475SGerrit Renker 6639bf17475SGerrit Renker if (put_user(len, optlen) || copy_to_user(optval, val, len)) 6649bf17475SGerrit Renker return -EFAULT; 6659bf17475SGerrit Renker 6669bf17475SGerrit Renker return 0; 6679bf17475SGerrit Renker } 6689bf17475SGerrit Renker 6699bf17475SGerrit Renker /* 6709bf17475SGerrit Renker * Receiver Half-Connection Routines 6719bf17475SGerrit Renker */ 67256724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6737c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6747c657876SArnaldo Carvalho de Melo { 6757c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6767c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6777c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6787c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6797c657876SArnaldo Carvalho de Melo }; 6807c657876SArnaldo Carvalho de Melo 6817c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6827c657876SArnaldo Carvalho de Melo } 6837c657876SArnaldo Carvalho de Melo #endif 6847c657876SArnaldo Carvalho de Melo 685c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 6861f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 6877c657876SArnaldo Carvalho de Melo { 68859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6897c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 6907c657876SArnaldo Carvalho de Melo 6917c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 6921f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 6931f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 6947c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 6957c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 6967c657876SArnaldo Carvalho de Melo } 6977c657876SArnaldo Carvalho de Melo 69878ad713dSGerrit Renker static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) 69978ad713dSGerrit Renker { 70078ad713dSGerrit Renker if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ 70178ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 70278ad713dSGerrit Renker else 70378ad713dSGerrit Renker hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : 70478ad713dSGerrit Renker (9 * hcrx->ccid3hcrx_s + len) / 10; 70578ad713dSGerrit Renker } 70678ad713dSGerrit Renker 7077c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 7087c657876SArnaldo Carvalho de Melo { 70959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7107c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 7118c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 712e7c23357SArnaldo Carvalho de Melo ktime_t now; 7130f9e5b57SGerrit Renker suseconds_t delta; 7147c657876SArnaldo Carvalho de Melo 715a9672411SGerrit Renker ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk), sk); 7167c657876SArnaldo Carvalho de Melo 717e7a81c6dSArnaldo Carvalho de Melo now = ktime_get_real(); 718b6ee3d4aSArnaldo Carvalho de Melo 7197c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 7207c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 7217c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 7227c657876SArnaldo Carvalho de Melo break; 7230f9e5b57SGerrit Renker case TFRC_RSTATE_DATA: 724e7a81c6dSArnaldo Carvalho de Melo delta = ktime_us_delta(now, 725e7a81c6dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback); 7260f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 727b9039a2aSGerrit Renker hcrx->ccid3hcrx_x_recv = 728b9039a2aSGerrit Renker scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 7297c657876SArnaldo Carvalho de Melo break; 73059348b19SGerrit Renker case TFRC_RSTATE_TERM: 731a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 7327c657876SArnaldo Carvalho de Melo return; 7337c657876SArnaldo Carvalho de Melo } 7347c657876SArnaldo Carvalho de Melo 7358c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 73659d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 737a9672411SGerrit Renker DCCP_WARN("%s(%p), no data packet in history!\n", 73859348b19SGerrit Renker dccp_role(sk), sk); 7397c657876SArnaldo Carvalho de Melo return; 7407c657876SArnaldo Carvalho de Melo } 7417c657876SArnaldo Carvalho de Melo 742b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 74366a377c5SIan McDonald hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; 7447c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7457c657876SArnaldo Carvalho de Melo 7460f9e5b57SGerrit Renker /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */ 747e7c23357SArnaldo Carvalho de Melo delta = ktime_us_delta(now, packet->dccphrx_tstamp); 7480f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 7490f9e5b57SGerrit Renker hcrx->ccid3hcrx_elapsed_time = delta / 10; 75045393a66SGerrit Renker 7517c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 75245393a66SGerrit Renker hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ 75345393a66SGerrit Renker else if (hcrx->ccid3hcrx_p > 1000000) { 75445393a66SGerrit Renker DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); 75545393a66SGerrit Renker hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ 75645393a66SGerrit Renker } else 7577c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 75845393a66SGerrit Renker 759507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7607c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7617c657876SArnaldo Carvalho de Melo } 7627c657876SArnaldo Carvalho de Melo 7632d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7647c657876SArnaldo Carvalho de Melo { 7652e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 76660fe62e7SAndrea Bittau __be32 x_recv, pinv; 7677c657876SArnaldo Carvalho de Melo 76859d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7692d0817d1SArnaldo Carvalho de Melo return 0; 7707c657876SArnaldo Carvalho de Melo 7712e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 77266a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 7734fded33bSArnaldo Carvalho de Melo 7744fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7752d0817d1SArnaldo Carvalho de Melo return 0; 7764fded33bSArnaldo Carvalho de Melo 7774fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7784fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7792d0817d1SArnaldo Carvalho de Melo 7802d0817d1SArnaldo Carvalho de Melo if ((hcrx->ccid3hcrx_elapsed_time != 0 && 7812d0817d1SArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 7822d0817d1SArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time)) || 7832d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb) || 7844fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7852d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7864fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 7872d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 7882d0817d1SArnaldo Carvalho de Melo return -1; 7892d0817d1SArnaldo Carvalho de Melo 7902d0817d1SArnaldo Carvalho de Melo return 0; 7917c657876SArnaldo Carvalho de Melo } 7927c657876SArnaldo Carvalho de Melo 79366a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 79466a377c5SIan McDonald struct dccp_rx_hist_entry *packet) 7957c657876SArnaldo Carvalho de Melo { 79659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7978109b02bSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *rx_hist = 7988109b02bSArnaldo Carvalho de Melo dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); 79966a377c5SIan McDonald u64 seqno = packet->dccphrx_seqno; 80066a377c5SIan McDonald u64 tmp_seqno; 80166a377c5SIan McDonald int loss = 0; 80266a377c5SIan McDonald u8 ccval; 8037c657876SArnaldo Carvalho de Melo 80466a377c5SIan McDonald 80566a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 80666a377c5SIan McDonald 80766a377c5SIan McDonald if (!rx_hist || 80866a377c5SIan McDonald follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 80966a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 81066a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 81166a377c5SIan McDonald goto detect_out; 81266a377c5SIan McDonald } 81366a377c5SIan McDonald 81466a377c5SIan McDonald 81566a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 81666a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 81766a377c5SIan McDonald loss = 1; 818cc4d6a3aSArnaldo Carvalho de Melo dccp_li_update_li(sk, 819d83258a3SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, 820d83258a3SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_hist, 821e7c23357SArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback, 822d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s, 823d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv, 824d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv, 825d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_seqno_nonloss, 82666a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 82766a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 82866a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 82966a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 83066a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 83166a377c5SIan McDonald while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 83266a377c5SIan McDonald tmp_seqno, &ccval)) { 83366a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 83466a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 83566a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 83666a377c5SIan McDonald } 83766a377c5SIan McDonald } 83866a377c5SIan McDonald 83966a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 84066a377c5SIan McDonald /* but works at moment */ 84166a377c5SIan McDonald if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 84266a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 84366a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 84466a377c5SIan McDonald } 84566a377c5SIan McDonald 84666a377c5SIan McDonald detect_out: 84766a377c5SIan McDonald dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 84866a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 84966a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 85066a377c5SIan McDonald return loss; 8517c657876SArnaldo Carvalho de Melo } 8527c657876SArnaldo Carvalho de Melo 8537c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 8547c657876SArnaldo Carvalho de Melo { 85559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 8564fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 8578c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 8587dfee1a9SGerrit Renker u32 p_prev, r_sample, rtt_prev; 85978ad713dSGerrit Renker int loss, payload_size; 8609823b7b5SArnaldo Carvalho de Melo ktime_t now; 8611f2333aeSArnaldo Carvalho de Melo 86259725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 8634fded33bSArnaldo Carvalho de Melo 8647c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 8657c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 8667c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 8677c657876SArnaldo Carvalho de Melo return; 8689823b7b5SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 8694fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 8707c657876SArnaldo Carvalho de Melo break; 8713393da82SGerrit Renker r_sample = dccp_timestamp() - opt_recv->dccpor_timestamp_echo; 87266a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 8733393da82SGerrit Renker r_sample = dccp_sample_rtt(sk, 10 * r_sample); 874b3a3077dSArnaldo Carvalho de Melo 875b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 876b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 877b3a3077dSArnaldo Carvalho de Melo else 878b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 879b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 880b3a3077dSArnaldo Carvalho de Melo 88166a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 882a9672411SGerrit Renker ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n", 883a9672411SGerrit Renker dccp_role(sk), sk, hcrx->ccid3hcrx_rtt, 8844fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 8857c657876SArnaldo Carvalho de Melo break; 8867c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 8877c657876SArnaldo Carvalho de Melo break; 88859d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 8897c657876SArnaldo Carvalho de Melo return; 8907c657876SArnaldo Carvalho de Melo } 8917c657876SArnaldo Carvalho de Melo 892e7c23357SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, opt_recv->dccpor_ndp, 89354e6ecb2SChristoph Lameter skb, GFP_ATOMIC); 89459d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 895a9672411SGerrit Renker DCCP_WARN("%s(%p), Not enough mem to add rx packet " 89659348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 8977c657876SArnaldo Carvalho de Melo return; 8987c657876SArnaldo Carvalho de Melo } 8997c657876SArnaldo Carvalho de Melo 90066a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 9017c657876SArnaldo Carvalho de Melo 9027c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 9037c657876SArnaldo Carvalho de Melo return; 9047c657876SArnaldo Carvalho de Melo 90578ad713dSGerrit Renker payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; 90678ad713dSGerrit Renker ccid3_hc_rx_update_s(hcrx, payload_size); 90778ad713dSGerrit Renker 9087c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 9097c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 910a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial " 911a9672411SGerrit Renker "feedback\n", dccp_role(sk), sk, 9121f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 9137c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 9147c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 9157c657876SArnaldo Carvalho de Melo return; 9169823b7b5SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 91778ad713dSGerrit Renker hcrx->ccid3hcrx_bytes_recv += payload_size; 91866a377c5SIan McDonald if (loss) 919b6ee3d4aSArnaldo Carvalho de Melo break; 920b6ee3d4aSArnaldo Carvalho de Melo 9211faf0a1fSArnaldo Carvalho de Melo now = ktime_get_real(); 9221faf0a1fSArnaldo Carvalho de Melo if ((ktime_us_delta(now, hcrx->ccid3hcrx_tstamp_last_ack) - 9231faf0a1fSArnaldo Carvalho de Melo (s64)hcrx->ccid3hcrx_rtt) >= 0) { 924b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 9257c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 9267c657876SArnaldo Carvalho de Melo } 9277c657876SArnaldo Carvalho de Melo return; 92859348b19SGerrit Renker case TFRC_RSTATE_TERM: 929a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 9307c657876SArnaldo Carvalho de Melo return; 9317c657876SArnaldo Carvalho de Melo } 9327c657876SArnaldo Carvalho de Melo 9337c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 934a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n", 9354fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 9367c657876SArnaldo Carvalho de Melo 9377c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 9387c657876SArnaldo Carvalho de Melo 9397c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 940c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 941c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 942c0996660SIan McDonald 9437c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 944c0996660SIan McDonald if (i_mean != 0) 945c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 94659348b19SGerrit Renker } else 94759348b19SGerrit Renker DCCP_BUG("empty loss history"); 9487c657876SArnaldo Carvalho de Melo 9497c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 9507c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 9517c657876SArnaldo Carvalho de Melo return; 9527c657876SArnaldo Carvalho de Melo } 9537c657876SArnaldo Carvalho de Melo } 9547c657876SArnaldo Carvalho de Melo 95591f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 9567c657876SArnaldo Carvalho de Melo { 95791f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 9587c657876SArnaldo Carvalho de Melo 959a9672411SGerrit Renker ccid3_pr_debug("entry\n"); 9607c657876SArnaldo Carvalho de Melo 9617c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 9627c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 963ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 9641faf0a1fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = 965e7a81c6dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = ktime_get_real(); 96678ad713dSGerrit Renker hcrx->ccid3hcrx_s = 0; 967fe0499aeSGerrit Renker hcrx->ccid3hcrx_rtt = 0; 9687c657876SArnaldo Carvalho de Melo return 0; 9697c657876SArnaldo Carvalho de Melo } 9707c657876SArnaldo Carvalho de Melo 9717c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 9727c657876SArnaldo Carvalho de Melo { 97359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9747c657876SArnaldo Carvalho de Melo 9757c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 9767c657876SArnaldo Carvalho de Melo 9777c657876SArnaldo Carvalho de Melo /* Empty packet history */ 9788c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 9797c657876SArnaldo Carvalho de Melo 9807c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 981cc4d6a3aSArnaldo Carvalho de Melo dccp_li_hist_purge(&hcrx->ccid3hcrx_li_hist); 9827c657876SArnaldo Carvalho de Melo } 9837c657876SArnaldo Carvalho de Melo 9842babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 9852babe1f6SArnaldo Carvalho de Melo { 9862e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 9872babe1f6SArnaldo Carvalho de Melo 98859c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 98959c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 99059c2353dSArnaldo Carvalho de Melo return; 99159c2353dSArnaldo Carvalho de Melo 9922e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 9932babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 9942babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 9952babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 9962babe1f6SArnaldo Carvalho de Melo } 9972babe1f6SArnaldo Carvalho de Melo 99888f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 99988f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 100088f964dbSArnaldo Carvalho de Melo { 10012e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 100288f964dbSArnaldo Carvalho de Melo const void *val; 100388f964dbSArnaldo Carvalho de Melo 100488f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 100588f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 100688f964dbSArnaldo Carvalho de Melo return -EINVAL; 100788f964dbSArnaldo Carvalho de Melo 10082e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 100988f964dbSArnaldo Carvalho de Melo switch (optname) { 101088f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 101188f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 101288f964dbSArnaldo Carvalho de Melo return -EINVAL; 101388f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 101488f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 101588f964dbSArnaldo Carvalho de Melo break; 101688f964dbSArnaldo Carvalho de Melo default: 101788f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 101888f964dbSArnaldo Carvalho de Melo } 101988f964dbSArnaldo Carvalho de Melo 102088f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 102188f964dbSArnaldo Carvalho de Melo return -EFAULT; 102288f964dbSArnaldo Carvalho de Melo 102388f964dbSArnaldo Carvalho de Melo return 0; 102488f964dbSArnaldo Carvalho de Melo } 102588f964dbSArnaldo Carvalho de Melo 102691f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 10273dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 10287c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 10297c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 103091f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 10317c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 10327c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 10337c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 10347c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 10357c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 10367c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 103791f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 10387c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 10397c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 10407c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 10417c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 10422babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 10432babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 104488f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 104588f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 10467c657876SArnaldo Carvalho de Melo }; 10477c657876SArnaldo Carvalho de Melo 104856724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 1049042d18f9SGerrit Renker module_param(ccid3_debug, bool, 0444); 10507c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 105156724aa4SGerrit Renker #endif 10527c657876SArnaldo Carvalho de Melo 10537c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 10547c657876SArnaldo Carvalho de Melo { 10558c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 10567c657876SArnaldo Carvalho de Melo 10578c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 10588c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 10597c657876SArnaldo Carvalho de Melo goto out; 10607c657876SArnaldo Carvalho de Melo 10618c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 10628c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 10638c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 10647c657876SArnaldo Carvalho de Melo 10657c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 10667c657876SArnaldo Carvalho de Melo if (rc != 0) 1067cc4d6a3aSArnaldo Carvalho de Melo goto out_free_tx; 10687c657876SArnaldo Carvalho de Melo out: 10697c657876SArnaldo Carvalho de Melo return rc; 10708c60f3faSArnaldo Carvalho de Melo 10718c60f3faSArnaldo Carvalho de Melo out_free_tx: 10728c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 10738c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 10748c60f3faSArnaldo Carvalho de Melo out_free_rx: 10758c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 10768c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 10777c657876SArnaldo Carvalho de Melo goto out; 10787c657876SArnaldo Carvalho de Melo } 10797c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 10807c657876SArnaldo Carvalho de Melo 10817c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 10827c657876SArnaldo Carvalho de Melo { 10837c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 10847c657876SArnaldo Carvalho de Melo 10858c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 10868c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 10878c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 10887c657876SArnaldo Carvalho de Melo } 10898c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 10908c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 10918c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 10927c657876SArnaldo Carvalho de Melo } 10937c657876SArnaldo Carvalho de Melo } 10947c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 10957c657876SArnaldo Carvalho de Melo 1096e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 10971f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 10987c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 10997c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 11007c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1101