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 30559348b19SGerrit Renker BUG_ON(hctx == NULL); 3061f2333aeSArnaldo 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 38659348b19SGerrit Renker BUG_ON(hctx == NULL); 3877c657876SArnaldo Carvalho de Melo 38878ad713dSGerrit Renker ccid3_hc_tx_update_s(hctx, len); 38978ad713dSGerrit Renker 390c5a1ae9aSGerrit Renker packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC); 39159d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 392c5a1ae9aSGerrit Renker DCCP_CRIT("packet history - out of memory!"); 3937c657876SArnaldo Carvalho de Melo return; 3947c657876SArnaldo Carvalho de Melo } 395c5a1ae9aSGerrit Renker dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, packet); 396c5a1ae9aSGerrit Renker 3970740d49cSArnaldo Carvalho de Melo packet->dccphtx_tstamp = ktime_get_real(); 398c5a1ae9aSGerrit Renker packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss; 399c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 4008c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 4017c657876SArnaldo Carvalho de Melo } 4027c657876SArnaldo Carvalho de Melo 4037c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 4047c657876SArnaldo Carvalho de Melo { 40559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 4067c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4078c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 4080740d49cSArnaldo Carvalho de Melo ktime_t now; 4092a1fda6fSGerrit Renker unsigned long t_nfb; 4107dfee1a9SGerrit Renker u32 pinv, r_sample; 4111f2333aeSArnaldo Carvalho de Melo 41259348b19SGerrit Renker BUG_ON(hctx == NULL); 4137c657876SArnaldo Carvalho de Melo 4147c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4157c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4167c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4177c657876SArnaldo Carvalho de Melo return; 4187c657876SArnaldo Carvalho de Melo 4197c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4207c657876SArnaldo Carvalho de Melo 4217c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4227c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4237c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4245c3fbb6aSGerrit Renker /* get packet from history to look up t_recvdata */ 4258c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4268c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 42759d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 4285c3fbb6aSGerrit Renker DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " 42959348b19SGerrit Renker "in history!\n", dccp_role(sk), sk, 43059d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4317c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4327c657876SArnaldo Carvalho de Melo return; 4337c657876SArnaldo Carvalho de Melo } 4347c657876SArnaldo Carvalho de Melo 4351a21e49aSGerrit Renker /* Update receive rate in units of 64 * bytes/second */ 4369e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; 4379e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 6; 4385c3fbb6aSGerrit Renker 4395c3fbb6aSGerrit Renker /* Update loss event rate */ 4405c3fbb6aSGerrit Renker pinv = opt_recv->ccid3or_loss_event_rate; 44145393a66SGerrit Renker if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ 4425c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 0; 44345393a66SGerrit Renker else /* can not exceed 100% */ 4445c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 1000000 / pinv; 4455c3fbb6aSGerrit Renker 4469823b7b5SArnaldo Carvalho de Melo now = ktime_get_real(); 4475c3fbb6aSGerrit Renker /* 4485c3fbb6aSGerrit Renker * Calculate new round trip sample as per [RFC 3448, 4.3] by 4495c3fbb6aSGerrit Renker * R_sample = (now - t_recvdata) - t_elapsed 4505c3fbb6aSGerrit Renker */ 4513393da82SGerrit Renker r_sample = dccp_sample_rtt(sk, ktime_us_delta(now, packet->dccphtx_tstamp)); 4525c3fbb6aSGerrit Renker 4537dfee1a9SGerrit Renker /* 4547dfee1a9SGerrit Renker * Update RTT estimate by 4557c657876SArnaldo Carvalho de Melo * If (No feedback recv) 4567c657876SArnaldo Carvalho de Melo * R = R_sample; 4577c657876SArnaldo Carvalho de Melo * Else 4587c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 4597c657876SArnaldo Carvalho de Melo * 4607c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 4617c657876SArnaldo Carvalho de Melo */ 4627c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 4631a21e49aSGerrit Renker /* 4641a21e49aSGerrit Renker * Larger Initial Windows [RFC 4342, sec. 5] 4651a21e49aSGerrit Renker */ 4667c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 467a21f9f96SGerrit Renker hctx->ccid3hctx_x = rfc3390_initial_rate(sk); 4689823b7b5SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 469a79ef76fSGerrit Renker 4701266adeeSGerrit Renker ccid3_update_send_interval(hctx); 4715c3fbb6aSGerrit Renker 472a21f9f96SGerrit Renker ccid3_pr_debug("%s(%p), s=%u, MSS=%u, " 4737dfee1a9SGerrit Renker "R_sample=%uus, X=%u\n", dccp_role(sk), 4740f08461eSAndrew Morton sk, hctx->ccid3hctx_s, 4751b07a95aSDavid S. Miller dccp_sk(sk)->dccps_mss_cache, r_sample, 4761a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4775c3fbb6aSGerrit Renker 478a79ef76fSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 479a79ef76fSGerrit Renker } else { 4805c3fbb6aSGerrit Renker hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + 4817dfee1a9SGerrit Renker r_sample) / 10; 4825c3fbb6aSGerrit Renker 483ff586298SGerrit Renker /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ 484ff586298SGerrit Renker if (hctx->ccid3hctx_p > 0) 485ff586298SGerrit Renker hctx->ccid3hctx_x_calc = 486ff586298SGerrit Renker tfrc_calc_x(hctx->ccid3hctx_s, 487ff586298SGerrit Renker hctx->ccid3hctx_rtt, 488ff586298SGerrit Renker hctx->ccid3hctx_p); 489aa97efd9SGerrit Renker ccid3_hc_tx_update_x(sk, &now); 4907c657876SArnaldo Carvalho de Melo 4917dfee1a9SGerrit Renker ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, " 4928109b02bSArnaldo Carvalho de Melo "p=%u, X_calc=%u, X_recv=%u, X=%u\n", 4938109b02bSArnaldo Carvalho de Melo dccp_role(sk), 4947dfee1a9SGerrit Renker sk, hctx->ccid3hctx_rtt, r_sample, 4955c3fbb6aSGerrit Renker hctx->ccid3hctx_s, hctx->ccid3hctx_p, 4965c3fbb6aSGerrit Renker hctx->ccid3hctx_x_calc, 4979e8efc82SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6), 4981a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4997c657876SArnaldo Carvalho de Melo } 5007c657876SArnaldo Carvalho de Melo 5017c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 5027c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5037c657876SArnaldo Carvalho de Melo 5047c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5058c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5068c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 507c530cfb1SArnaldo Carvalho de Melo /* 5088109b02bSArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible 5098109b02bSArnaldo Carvalho de Melo * that we now can send a packet, so wake up dccp_wait_for_ccid 510c530cfb1SArnaldo Carvalho de Melo */ 511c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5128c60f3faSArnaldo Carvalho de Melo 5138a508ac2SGerrit Renker /* 5148a508ac2SGerrit Renker * Update timeout interval for the nofeedback timer. 5158a508ac2SGerrit Renker * We use a configuration option to increase the lower bound. 5168109b02bSArnaldo Carvalho de Melo * This can help avoid triggering the nofeedback timer too 5178109b02bSArnaldo Carvalho de Melo * often ('spinning') on LANs with small RTTs. 5188a508ac2SGerrit Renker */ 5195d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 5208a508ac2SGerrit Renker CONFIG_IP_DCCP_CCID3_RTO * 5218a508ac2SGerrit Renker (USEC_PER_SEC/1000)); 5221f2333aeSArnaldo Carvalho de Melo /* 5231f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5248a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 5251f2333aeSArnaldo Carvalho de Melo */ 5268a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 5277c657876SArnaldo Carvalho de Melo 528a9672411SGerrit Renker ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " 5298109b02bSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5308109b02bSArnaldo Carvalho de Melo dccp_role(sk), 531a9672411SGerrit Renker sk, usecs_to_jiffies(t_nfb), t_nfb); 5327c657876SArnaldo Carvalho de Melo 5337c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5342a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 5357c657876SArnaldo Carvalho de Melo 5367c657876SArnaldo Carvalho de Melo /* set idle flag */ 5377c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5387c657876SArnaldo Carvalho de Melo break; 539151a9931SGerrit Renker case TFRC_SSTATE_NO_SENT: /* fall through */ 5405e19e3fcSGerrit Renker case TFRC_SSTATE_TERM: /* ignore feedback when closing */ 5417c657876SArnaldo Carvalho de Melo break; 5427c657876SArnaldo Carvalho de Melo } 5437c657876SArnaldo Carvalho de Melo } 5447c657876SArnaldo Carvalho de Melo 5457c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5461f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5471f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5487c657876SArnaldo Carvalho de Melo { 5497c657876SArnaldo Carvalho de Melo int rc = 0; 55059725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 55159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5527c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 5537c657876SArnaldo Carvalho de Melo 55459d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 5557c657876SArnaldo Carvalho de Melo 5567c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5577c657876SArnaldo Carvalho de Melo 5587c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5597c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5607c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5617c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5627c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5637c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5647c657876SArnaldo Carvalho de Melo } 5657c657876SArnaldo Carvalho de Melo 5667c657876SArnaldo Carvalho de Melo switch (option) { 5677c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 56859d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 569a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 57059348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 57159348b19SGerrit Renker dccp_role(sk), sk, len); 5727c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5737c657876SArnaldo Carvalho de Melo } else { 5748109b02bSArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = 5758109b02bSArnaldo Carvalho de Melo ntohl(*(__be32 *)value); 576a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", 5777c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5787c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 5797c657876SArnaldo Carvalho de Melo } 5807c657876SArnaldo Carvalho de Melo break; 5817c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 5827c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 5837c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 584a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n", 5857c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5867c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 5877c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 5887c657876SArnaldo Carvalho de Melo break; 5897c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 59059d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 591a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 59259348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 59359348b19SGerrit Renker dccp_role(sk), sk, len); 5947c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5957c657876SArnaldo Carvalho de Melo } else { 5968109b02bSArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 5978109b02bSArnaldo Carvalho de Melo ntohl(*(__be32 *)value); 598a9672411SGerrit Renker ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", 5997c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6007c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 6017c657876SArnaldo Carvalho de Melo } 6027c657876SArnaldo Carvalho de Melo break; 6037c657876SArnaldo Carvalho de Melo } 6047c657876SArnaldo Carvalho de Melo 6057c657876SArnaldo Carvalho de Melo return rc; 6067c657876SArnaldo Carvalho de Melo } 6077c657876SArnaldo Carvalho de Melo 60891f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 6097c657876SArnaldo Carvalho de Melo { 61091f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 6117c657876SArnaldo Carvalho de Melo 61278ad713dSGerrit Renker hctx->ccid3hctx_s = 0; 613fe0499aeSGerrit Renker hctx->ccid3hctx_rtt = 0; 6147c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6157c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 616aa5d7df3SArnaldo Carvalho de Melo 6178109b02bSArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = 6188109b02bSArnaldo Carvalho de Melo ccid3_hc_tx_no_feedback_timer; 619aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 6207c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6217c657876SArnaldo Carvalho de Melo 6227c657876SArnaldo Carvalho de Melo return 0; 6237c657876SArnaldo Carvalho de Melo } 6247c657876SArnaldo Carvalho de Melo 6257c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6267c657876SArnaldo Carvalho de Melo { 62759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6287c657876SArnaldo Carvalho de Melo 6297c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 6307c657876SArnaldo Carvalho de Melo 6317c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6327c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6337c657876SArnaldo Carvalho de Melo 6347c657876SArnaldo Carvalho de Melo /* Empty packet history */ 6358c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 6367c657876SArnaldo Carvalho de Melo } 6377c657876SArnaldo Carvalho de Melo 6389bf17475SGerrit Renker static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 6399bf17475SGerrit Renker { 6409bf17475SGerrit Renker const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6417c657876SArnaldo Carvalho de Melo 6429bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6439bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6449bf17475SGerrit Renker return; 6459bf17475SGerrit Renker 6469bf17475SGerrit Renker BUG_ON(hctx == NULL); 6479bf17475SGerrit Renker 6489bf17475SGerrit Renker info->tcpi_rto = hctx->ccid3hctx_t_rto; 6499bf17475SGerrit Renker info->tcpi_rtt = hctx->ccid3hctx_rtt; 6509bf17475SGerrit Renker } 6519bf17475SGerrit Renker 6529bf17475SGerrit Renker static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 6539bf17475SGerrit Renker u32 __user *optval, int __user *optlen) 6549bf17475SGerrit Renker { 6559bf17475SGerrit Renker const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6569bf17475SGerrit Renker const void *val; 6579bf17475SGerrit Renker 6589bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6599bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6609bf17475SGerrit Renker return -EINVAL; 6619bf17475SGerrit Renker 6629bf17475SGerrit Renker switch (optname) { 6639bf17475SGerrit Renker case DCCP_SOCKOPT_CCID_TX_INFO: 6649bf17475SGerrit Renker if (len < sizeof(hctx->ccid3hctx_tfrc)) 6659bf17475SGerrit Renker return -EINVAL; 6669bf17475SGerrit Renker len = sizeof(hctx->ccid3hctx_tfrc); 6679bf17475SGerrit Renker val = &hctx->ccid3hctx_tfrc; 6689bf17475SGerrit Renker break; 6699bf17475SGerrit Renker default: 6709bf17475SGerrit Renker return -ENOPROTOOPT; 6719bf17475SGerrit Renker } 6729bf17475SGerrit Renker 6739bf17475SGerrit Renker if (put_user(len, optlen) || copy_to_user(optval, val, len)) 6749bf17475SGerrit Renker return -EFAULT; 6759bf17475SGerrit Renker 6769bf17475SGerrit Renker return 0; 6779bf17475SGerrit Renker } 6789bf17475SGerrit Renker 6799bf17475SGerrit Renker /* 6809bf17475SGerrit Renker * Receiver Half-Connection Routines 6819bf17475SGerrit Renker */ 68256724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6837c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6847c657876SArnaldo Carvalho de Melo { 6857c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6867c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6877c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6887c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6897c657876SArnaldo Carvalho de Melo }; 6907c657876SArnaldo Carvalho de Melo 6917c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6927c657876SArnaldo Carvalho de Melo } 6937c657876SArnaldo Carvalho de Melo #endif 6947c657876SArnaldo Carvalho de Melo 695c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 6961f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 6977c657876SArnaldo Carvalho de Melo { 69859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6997c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 7007c657876SArnaldo Carvalho de Melo 7017c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 7021f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 7031f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 7047c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 7057c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 7067c657876SArnaldo Carvalho de Melo } 7077c657876SArnaldo Carvalho de Melo 70878ad713dSGerrit Renker static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) 70978ad713dSGerrit Renker { 71078ad713dSGerrit Renker if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ 71178ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 71278ad713dSGerrit Renker else 71378ad713dSGerrit Renker hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : 71478ad713dSGerrit Renker (9 * hcrx->ccid3hcrx_s + len) / 10; 71578ad713dSGerrit Renker } 71678ad713dSGerrit Renker 7177c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 7187c657876SArnaldo Carvalho de Melo { 71959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7207c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 7218c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 722e7c23357SArnaldo Carvalho de Melo ktime_t now; 7230f9e5b57SGerrit Renker suseconds_t delta; 7247c657876SArnaldo Carvalho de Melo 725a9672411SGerrit Renker ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk), sk); 7267c657876SArnaldo Carvalho de Melo 727e7a81c6dSArnaldo Carvalho de Melo now = ktime_get_real(); 728b6ee3d4aSArnaldo Carvalho de Melo 7297c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 7307c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 7317c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 7327c657876SArnaldo Carvalho de Melo break; 7330f9e5b57SGerrit Renker case TFRC_RSTATE_DATA: 734e7a81c6dSArnaldo Carvalho de Melo delta = ktime_us_delta(now, 735e7a81c6dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback); 7360f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 737b9039a2aSGerrit Renker hcrx->ccid3hcrx_x_recv = 738b9039a2aSGerrit Renker scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 7397c657876SArnaldo Carvalho de Melo break; 74059348b19SGerrit Renker case TFRC_RSTATE_TERM: 741a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 7427c657876SArnaldo Carvalho de Melo return; 7437c657876SArnaldo Carvalho de Melo } 7447c657876SArnaldo Carvalho de Melo 7458c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 74659d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 747a9672411SGerrit Renker DCCP_WARN("%s(%p), no data packet in history!\n", 74859348b19SGerrit Renker dccp_role(sk), sk); 7497c657876SArnaldo Carvalho de Melo return; 7507c657876SArnaldo Carvalho de Melo } 7517c657876SArnaldo Carvalho de Melo 752b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 75366a377c5SIan McDonald hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; 7547c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7557c657876SArnaldo Carvalho de Melo 7560f9e5b57SGerrit Renker /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */ 757e7c23357SArnaldo Carvalho de Melo delta = ktime_us_delta(now, packet->dccphrx_tstamp); 7580f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 7590f9e5b57SGerrit Renker hcrx->ccid3hcrx_elapsed_time = delta / 10; 76045393a66SGerrit Renker 7617c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 76245393a66SGerrit Renker hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ 76345393a66SGerrit Renker else if (hcrx->ccid3hcrx_p > 1000000) { 76445393a66SGerrit Renker DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); 76545393a66SGerrit Renker hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ 76645393a66SGerrit Renker } else 7677c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 76845393a66SGerrit Renker 769507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7707c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7717c657876SArnaldo Carvalho de Melo } 7727c657876SArnaldo Carvalho de Melo 7732d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7747c657876SArnaldo Carvalho de Melo { 77559d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 77660fe62e7SAndrea Bittau __be32 x_recv, pinv; 7777c657876SArnaldo Carvalho de Melo 77859d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 77959d203f9SArnaldo Carvalho de Melo 78059d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7812d0817d1SArnaldo Carvalho de Melo return 0; 7827c657876SArnaldo Carvalho de Melo 78366a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 7844fded33bSArnaldo Carvalho de Melo 7854fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7862d0817d1SArnaldo Carvalho de Melo return 0; 7874fded33bSArnaldo Carvalho de Melo 7884fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7894fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7902d0817d1SArnaldo Carvalho de Melo 7912d0817d1SArnaldo Carvalho de Melo if ((hcrx->ccid3hcrx_elapsed_time != 0 && 7922d0817d1SArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 7932d0817d1SArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time)) || 7942d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb) || 7954fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7962d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7974fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 7982d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 7992d0817d1SArnaldo Carvalho de Melo return -1; 8002d0817d1SArnaldo Carvalho de Melo 8012d0817d1SArnaldo Carvalho de Melo return 0; 8027c657876SArnaldo Carvalho de Melo } 8037c657876SArnaldo Carvalho de Melo 80466a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 80566a377c5SIan McDonald struct dccp_rx_hist_entry *packet) 8067c657876SArnaldo Carvalho de Melo { 80759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 8088109b02bSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *rx_hist = 8098109b02bSArnaldo Carvalho de Melo dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); 81066a377c5SIan McDonald u64 seqno = packet->dccphrx_seqno; 81166a377c5SIan McDonald u64 tmp_seqno; 81266a377c5SIan McDonald int loss = 0; 81366a377c5SIan McDonald u8 ccval; 8147c657876SArnaldo Carvalho de Melo 81566a377c5SIan McDonald 81666a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 81766a377c5SIan McDonald 81866a377c5SIan McDonald if (!rx_hist || 81966a377c5SIan McDonald follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 82066a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 82166a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 82266a377c5SIan McDonald goto detect_out; 82366a377c5SIan McDonald } 82466a377c5SIan McDonald 82566a377c5SIan McDonald 82666a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 82766a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 82866a377c5SIan McDonald loss = 1; 829cc4d6a3aSArnaldo Carvalho de Melo dccp_li_update_li(sk, 830d83258a3SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, 831d83258a3SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_hist, 832e7c23357SArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback, 833d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s, 834d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv, 835d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv, 836d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_seqno_nonloss, 83766a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 83866a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 83966a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 84066a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 84166a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 84266a377c5SIan McDonald while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 84366a377c5SIan McDonald tmp_seqno, &ccval)) { 84466a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 84566a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 84666a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 84766a377c5SIan McDonald } 84866a377c5SIan McDonald } 84966a377c5SIan McDonald 85066a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 85166a377c5SIan McDonald /* but works at moment */ 85266a377c5SIan McDonald if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 85366a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 85466a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 85566a377c5SIan McDonald } 85666a377c5SIan McDonald 85766a377c5SIan McDonald detect_out: 85866a377c5SIan McDonald dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 85966a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 86066a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 86166a377c5SIan McDonald return loss; 8627c657876SArnaldo Carvalho de Melo } 8637c657876SArnaldo Carvalho de Melo 8647c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 8657c657876SArnaldo Carvalho de Melo { 86659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 8674fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 8688c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 8697dfee1a9SGerrit Renker u32 p_prev, r_sample, rtt_prev; 87078ad713dSGerrit Renker int loss, payload_size; 8719823b7b5SArnaldo Carvalho de Melo ktime_t now; 8721f2333aeSArnaldo Carvalho de Melo 87359348b19SGerrit Renker BUG_ON(hcrx == NULL); 8747c657876SArnaldo Carvalho de Melo 87559725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 8764fded33bSArnaldo Carvalho de Melo 8777c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 8787c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 8797c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 8807c657876SArnaldo Carvalho de Melo return; 8819823b7b5SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 8824fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 8837c657876SArnaldo Carvalho de Melo break; 8843393da82SGerrit Renker r_sample = dccp_timestamp() - opt_recv->dccpor_timestamp_echo; 88566a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 8863393da82SGerrit Renker r_sample = dccp_sample_rtt(sk, 10 * r_sample); 887b3a3077dSArnaldo Carvalho de Melo 888b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 889b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 890b3a3077dSArnaldo Carvalho de Melo else 891b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 892b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 893b3a3077dSArnaldo Carvalho de Melo 89466a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 895a9672411SGerrit Renker ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n", 896a9672411SGerrit Renker dccp_role(sk), sk, hcrx->ccid3hcrx_rtt, 8974fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 8987c657876SArnaldo Carvalho de Melo break; 8997c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 9007c657876SArnaldo Carvalho de Melo break; 90159d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 9027c657876SArnaldo Carvalho de Melo return; 9037c657876SArnaldo Carvalho de Melo } 9047c657876SArnaldo Carvalho de Melo 905e7c23357SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, opt_recv->dccpor_ndp, 90654e6ecb2SChristoph Lameter skb, GFP_ATOMIC); 90759d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 908a9672411SGerrit Renker DCCP_WARN("%s(%p), Not enough mem to add rx packet " 90959348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 9107c657876SArnaldo Carvalho de Melo return; 9117c657876SArnaldo Carvalho de Melo } 9127c657876SArnaldo Carvalho de Melo 91366a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 9147c657876SArnaldo Carvalho de Melo 9157c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 9167c657876SArnaldo Carvalho de Melo return; 9177c657876SArnaldo Carvalho de Melo 91878ad713dSGerrit Renker payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; 91978ad713dSGerrit Renker ccid3_hc_rx_update_s(hcrx, payload_size); 92078ad713dSGerrit Renker 9217c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 9227c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 923a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial " 924a9672411SGerrit Renker "feedback\n", dccp_role(sk), sk, 9251f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 9267c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 9277c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 9287c657876SArnaldo Carvalho de Melo return; 9299823b7b5SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 93078ad713dSGerrit Renker hcrx->ccid3hcrx_bytes_recv += payload_size; 93166a377c5SIan McDonald if (loss) 932b6ee3d4aSArnaldo Carvalho de Melo break; 933b6ee3d4aSArnaldo Carvalho de Melo 9341faf0a1fSArnaldo Carvalho de Melo now = ktime_get_real(); 9351faf0a1fSArnaldo Carvalho de Melo if ((ktime_us_delta(now, hcrx->ccid3hcrx_tstamp_last_ack) - 9361faf0a1fSArnaldo Carvalho de Melo (s64)hcrx->ccid3hcrx_rtt) >= 0) { 937b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 9387c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 9397c657876SArnaldo Carvalho de Melo } 9407c657876SArnaldo Carvalho de Melo return; 94159348b19SGerrit Renker case TFRC_RSTATE_TERM: 942a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 9437c657876SArnaldo Carvalho de Melo return; 9447c657876SArnaldo Carvalho de Melo } 9457c657876SArnaldo Carvalho de Melo 9467c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 947a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n", 9484fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 9497c657876SArnaldo Carvalho de Melo 9507c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 9517c657876SArnaldo Carvalho de Melo 9527c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 953c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 954c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 955c0996660SIan McDonald 9567c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 957c0996660SIan McDonald if (i_mean != 0) 958c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 95959348b19SGerrit Renker } else 96059348b19SGerrit Renker DCCP_BUG("empty loss history"); 9617c657876SArnaldo Carvalho de Melo 9627c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 9637c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 9647c657876SArnaldo Carvalho de Melo return; 9657c657876SArnaldo Carvalho de Melo } 9667c657876SArnaldo Carvalho de Melo } 9677c657876SArnaldo Carvalho de Melo 96891f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 9697c657876SArnaldo Carvalho de Melo { 97091f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 9717c657876SArnaldo Carvalho de Melo 972a9672411SGerrit Renker ccid3_pr_debug("entry\n"); 9737c657876SArnaldo Carvalho de Melo 9747c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 9757c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 976ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 9771faf0a1fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = 978e7a81c6dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = ktime_get_real(); 97978ad713dSGerrit Renker hcrx->ccid3hcrx_s = 0; 980fe0499aeSGerrit Renker hcrx->ccid3hcrx_rtt = 0; 9817c657876SArnaldo Carvalho de Melo return 0; 9827c657876SArnaldo Carvalho de Melo } 9837c657876SArnaldo Carvalho de Melo 9847c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 9857c657876SArnaldo Carvalho de Melo { 98659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9877c657876SArnaldo Carvalho de Melo 98859d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 9897c657876SArnaldo Carvalho de Melo 9907c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 9917c657876SArnaldo Carvalho de Melo 9927c657876SArnaldo Carvalho de Melo /* Empty packet history */ 9938c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 9947c657876SArnaldo Carvalho de Melo 9957c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 996cc4d6a3aSArnaldo Carvalho de Melo dccp_li_hist_purge(&hcrx->ccid3hcrx_li_hist); 9977c657876SArnaldo Carvalho de Melo } 9987c657876SArnaldo Carvalho de Melo 9992babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 10002babe1f6SArnaldo Carvalho de Melo { 100159725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 10022babe1f6SArnaldo Carvalho de Melo 100359c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 100459c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 100559c2353dSArnaldo Carvalho de Melo return; 100659c2353dSArnaldo Carvalho de Melo 100759d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 10082babe1f6SArnaldo Carvalho de Melo 10092babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 10102babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 10112babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 10122babe1f6SArnaldo Carvalho de Melo } 10132babe1f6SArnaldo Carvalho de Melo 101488f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 101588f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 101688f964dbSArnaldo Carvalho de Melo { 101788f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 101888f964dbSArnaldo Carvalho de Melo const void *val; 101988f964dbSArnaldo Carvalho de Melo 102088f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 102188f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 102288f964dbSArnaldo Carvalho de Melo return -EINVAL; 102388f964dbSArnaldo Carvalho de Melo 102488f964dbSArnaldo Carvalho de Melo switch (optname) { 102588f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 102688f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 102788f964dbSArnaldo Carvalho de Melo return -EINVAL; 102888f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 102988f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 103088f964dbSArnaldo Carvalho de Melo break; 103188f964dbSArnaldo Carvalho de Melo default: 103288f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 103388f964dbSArnaldo Carvalho de Melo } 103488f964dbSArnaldo Carvalho de Melo 103588f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 103688f964dbSArnaldo Carvalho de Melo return -EFAULT; 103788f964dbSArnaldo Carvalho de Melo 103888f964dbSArnaldo Carvalho de Melo return 0; 103988f964dbSArnaldo Carvalho de Melo } 104088f964dbSArnaldo Carvalho de Melo 104191f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 10423dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 10437c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 10447c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 104591f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 10467c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 10477c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 10487c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 10497c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 10507c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 10517c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 105291f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 10537c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 10547c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 10557c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 10567c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 10572babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 10582babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 105988f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 106088f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 10617c657876SArnaldo Carvalho de Melo }; 10627c657876SArnaldo Carvalho de Melo 106356724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 10647c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 10657c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 106656724aa4SGerrit Renker #endif 10677c657876SArnaldo Carvalho de Melo 10687c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 10697c657876SArnaldo Carvalho de Melo { 10708c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 10717c657876SArnaldo Carvalho de Melo 10728c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 10738c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 10747c657876SArnaldo Carvalho de Melo goto out; 10757c657876SArnaldo Carvalho de Melo 10768c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 10778c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 10788c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 10797c657876SArnaldo Carvalho de Melo 10807c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 10817c657876SArnaldo Carvalho de Melo if (rc != 0) 1082cc4d6a3aSArnaldo Carvalho de Melo goto out_free_tx; 10837c657876SArnaldo Carvalho de Melo out: 10847c657876SArnaldo Carvalho de Melo return rc; 10858c60f3faSArnaldo Carvalho de Melo 10868c60f3faSArnaldo Carvalho de Melo out_free_tx: 10878c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 10888c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 10898c60f3faSArnaldo Carvalho de Melo out_free_rx: 10908c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 10918c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 10927c657876SArnaldo Carvalho de Melo goto out; 10937c657876SArnaldo Carvalho de Melo } 10947c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 10957c657876SArnaldo Carvalho de Melo 10967c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 10977c657876SArnaldo Carvalho de Melo { 10987c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 10997c657876SArnaldo Carvalho de Melo 11008c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 11018c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 11028c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 11037c657876SArnaldo Carvalho de Melo } 11048c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 11058c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 11068c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 11077c657876SArnaldo Carvalho de Melo } 11087c657876SArnaldo Carvalho de Melo } 11097c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 11107c657876SArnaldo Carvalho de Melo 1111e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 11121f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 11137c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 11147c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 11157c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1116