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 } 1167c657876SArnaldo Carvalho de Melo /* 1177c657876SArnaldo Carvalho de Melo * Update X by 1187c657876SArnaldo Carvalho de Melo * If (p > 0) 1195c3fbb6aSGerrit Renker * X_calc = calcX(s, R, p); 1207c657876SArnaldo Carvalho de Melo * X = max(min(X_calc, 2 * X_recv), s / t_mbi); 1217c657876SArnaldo Carvalho de Melo * Else 1227c657876SArnaldo Carvalho de Melo * If (now - tld >= R) 1237c657876SArnaldo Carvalho de Melo * X = max(min(2 * X, 2 * X_recv), s / R); 1247c657876SArnaldo Carvalho de Melo * tld = now; 1255c3fbb6aSGerrit Renker * 1261a21e49aSGerrit Renker * Note: X and X_recv are both stored in units of 64 * bytes/second, to support 1271a21e49aSGerrit Renker * fine-grained resolution of sending rates. This requires scaling by 2^6 1281a21e49aSGerrit Renker * throughout the code. Only X_calc is unscaled (in bytes/second). 1291a21e49aSGerrit Renker * 1307c657876SArnaldo Carvalho de Melo */ 131ac198ea8SArnaldo Carvalho de Melo static void ccid3_hc_tx_update_x(struct sock *sk) 132a79ef76fSGerrit Renker 1337c657876SArnaldo Carvalho de Melo { 13459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1350c150efbSGerrit Renker __u64 min_rate = 2 * hctx->ccid3hctx_x_recv; 1361a21e49aSGerrit Renker const __u64 old_x = hctx->ccid3hctx_x; 1377c657876SArnaldo Carvalho de Melo 1380c150efbSGerrit Renker /* 1390c150efbSGerrit Renker * Handle IDLE periods: do not reduce below RFC3390 initial sending rate 1400c150efbSGerrit Renker * when idling [RFC 4342, 5.1]. See also draft-ietf-dccp-rfc3448bis. 1410c150efbSGerrit Renker * For consistency with X and X_recv, min_rate is also scaled by 2^6. 1420c150efbSGerrit Renker */ 1430c150efbSGerrit Renker if (unlikely(hctx->ccid3hctx_idle)) { 1440c150efbSGerrit Renker min_rate = rfc3390_initial_rate(sk); 1450c150efbSGerrit Renker min_rate = max(min_rate, 2 * hctx->ccid3hctx_x_recv); 1460c150efbSGerrit Renker } 1470c150efbSGerrit Renker 14844158306SGerrit Renker if (hctx->ccid3hctx_p > 0) { 1491a21e49aSGerrit Renker 1509e8efc82SGerrit Renker hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6, 1510c150efbSGerrit Renker min_rate); 1529e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, 1539e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 1549e8efc82SGerrit Renker TFRC_T_MBI); 155b6ee3d4aSArnaldo Carvalho de Melo 156ac198ea8SArnaldo Carvalho de Melo } else { 15723f062afSArnaldo Carvalho de Melo const ktime_t now = ktime_get_real(); 158ac198ea8SArnaldo Carvalho de Melo 15923f062afSArnaldo Carvalho de Melo if ((ktime_us_delta(now, hctx->ccid3hctx_t_ld) - 16023f062afSArnaldo Carvalho de Melo (s64)hctx->ccid3hctx_rtt) >= 0) { 1611a21e49aSGerrit Renker 1629e8efc82SGerrit Renker hctx->ccid3hctx_x = 1630c150efbSGerrit Renker max(min(2 * hctx->ccid3hctx_x, min_rate), 1649e8efc82SGerrit Renker scaled_div(((__u64)hctx->ccid3hctx_s) << 6, 1656b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 166ac198ea8SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 167ac198ea8SArnaldo Carvalho de Melo } 168ff586298SGerrit Renker } 169a79ef76fSGerrit Renker 1708699be7dSIan McDonald if (hctx->ccid3hctx_x != old_x) { 1711761f7d7SGerrit Renker ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, " 1721761f7d7SGerrit Renker "X_recv=%u\n", (unsigned)(old_x >> 6), 1731761f7d7SGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6), 1741761f7d7SGerrit Renker hctx->ccid3hctx_x_calc, 1751761f7d7SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6)); 1768699be7dSIan McDonald 1771266adeeSGerrit Renker ccid3_update_send_interval(hctx); 1787c657876SArnaldo Carvalho de Melo } 1798699be7dSIan McDonald } 1807c657876SArnaldo Carvalho de Melo 18178ad713dSGerrit Renker /* 18278ad713dSGerrit Renker * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) 18378ad713dSGerrit Renker * @len: DCCP packet payload size in bytes 18478ad713dSGerrit Renker */ 18578ad713dSGerrit Renker static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) 18678ad713dSGerrit Renker { 1871266adeeSGerrit Renker const u16 old_s = hctx->ccid3hctx_s; 1881266adeeSGerrit Renker 1891266adeeSGerrit Renker hctx->ccid3hctx_s = old_s == 0 ? len : (9 * old_s + len) / 10; 1901266adeeSGerrit Renker 1911266adeeSGerrit Renker if (hctx->ccid3hctx_s != old_s) 1921266adeeSGerrit Renker ccid3_update_send_interval(hctx); 19378ad713dSGerrit Renker } 19478ad713dSGerrit Renker 1959f8681dbSGerrit Renker /* 1969f8681dbSGerrit Renker * Update Window Counter using the algorithm from [RFC 4342, 8.1]. 1979f8681dbSGerrit Renker * The algorithm is not applicable if RTT < 4 microseconds. 1989f8681dbSGerrit Renker */ 1999f8681dbSGerrit Renker static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, 2008132da4dSGerrit Renker ktime_t now) 2019f8681dbSGerrit Renker { 2029f8681dbSGerrit Renker u32 quarter_rtts; 2039f8681dbSGerrit Renker 2049f8681dbSGerrit Renker if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ 2059f8681dbSGerrit Renker return; 2069f8681dbSGerrit Renker 2078132da4dSGerrit Renker quarter_rtts = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count); 2088132da4dSGerrit Renker quarter_rtts /= hctx->ccid3hctx_rtt / 4; 2099f8681dbSGerrit Renker 2109f8681dbSGerrit Renker if (quarter_rtts > 0) { 2118132da4dSGerrit Renker hctx->ccid3hctx_t_last_win_count = now; 2129f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); 2139f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ 2149f8681dbSGerrit Renker } 2159f8681dbSGerrit Renker } 2169f8681dbSGerrit Renker 2177c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 2187c657876SArnaldo Carvalho de Melo { 2197c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 22059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2212a1fda6fSGerrit Renker unsigned long t_nfb = USEC_PER_SEC / 5; 2227c657876SArnaldo Carvalho de Melo 2237c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 2247c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 2257c657876SArnaldo Carvalho de Melo /* Try again later. */ 2267c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 22748e03eeeSGerrit Renker goto restart_timer; 2287c657876SArnaldo Carvalho de Melo } 2297c657876SArnaldo Carvalho de Melo 230a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk, 2317c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2327c657876SArnaldo Carvalho de Melo 2330c150efbSGerrit Renker hctx->ccid3hctx_idle = 1; 2340c150efbSGerrit Renker 2357c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 2367c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 237a79ef76fSGerrit Renker /* RFC 3448, 4.4: Halve send rate directly */ 2389e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2, 2399e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2409e8efc82SGerrit Renker TFRC_T_MBI); 2417c657876SArnaldo Carvalho de Melo 242a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u " 243a9672411SGerrit Renker "bytes/s\n", dccp_role(sk), sk, 2441f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 2451a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 24648e03eeeSGerrit Renker /* The value of R is still undefined and so we can not recompute 24748e03eeeSGerrit Renker * the timout value. Keep initial value as per [RFC 4342, 5]. */ 2482a1fda6fSGerrit Renker t_nfb = TFRC_INITIAL_TIMEOUT; 2491266adeeSGerrit Renker ccid3_update_send_interval(hctx); 2507c657876SArnaldo Carvalho de Melo break; 2517c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 2521f2333aeSArnaldo Carvalho de Melo /* 253ff586298SGerrit Renker * Modify the cached value of X_recv [RFC 3448, 4.4] 254ff586298SGerrit Renker * 255ff586298SGerrit Renker * If (p == 0 || X_calc > 2 * X_recv) 2567c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2577c657876SArnaldo Carvalho de Melo * Else 2587c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2591a21e49aSGerrit Renker * 2601a21e49aSGerrit Renker * Note that X_recv is scaled by 2^6 while X_calc is not 2617c657876SArnaldo Carvalho de Melo */ 26244158306SGerrit Renker BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); 2637c657876SArnaldo Carvalho de Melo 26444158306SGerrit Renker if (hctx->ccid3hctx_p == 0 || 2650c150efbSGerrit Renker (hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5))) { 2661a21e49aSGerrit Renker 2671a21e49aSGerrit Renker hctx->ccid3hctx_x_recv = 2689e8efc82SGerrit Renker max(hctx->ccid3hctx_x_recv / 2, 2699e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2701a21e49aSGerrit Renker (2 * TFRC_T_MBI)); 2719e8efc82SGerrit Renker } else { 2729e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc; 2739e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 4; 2749e8efc82SGerrit Renker } 275ff586298SGerrit Renker /* Now recalculate X [RFC 3448, 4.3, step (4)] */ 276ac198ea8SArnaldo Carvalho de Melo ccid3_hc_tx_update_x(sk); 2776b5e633aSArnaldo Carvalho de Melo /* 2786b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2798a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 2808a508ac2SGerrit Renker * See comments in packet_recv() regarding the value of t_RTO. 2816b5e633aSArnaldo Carvalho de Melo */ 2828a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 2837c657876SArnaldo Carvalho de Melo break; 28459348b19SGerrit Renker case TFRC_SSTATE_NO_SENT: 285a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk), sk); 28659348b19SGerrit Renker /* fall through */ 28759348b19SGerrit Renker case TFRC_SSTATE_TERM: 2887c657876SArnaldo Carvalho de Melo goto out; 2897c657876SArnaldo Carvalho de Melo } 2907c657876SArnaldo Carvalho de Melo 29148e03eeeSGerrit Renker restart_timer: 29248e03eeeSGerrit Renker sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2932a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 2947c657876SArnaldo Carvalho de Melo out: 2957c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2967c657876SArnaldo Carvalho de Melo sock_put(sk); 2977c657876SArnaldo Carvalho de Melo } 2987c657876SArnaldo Carvalho de Melo 2997da7f456SGerrit Renker /* 3007da7f456SGerrit Renker * returns 3017da7f456SGerrit Renker * > 0: delay (in msecs) that should pass before actually sending 3027da7f456SGerrit Renker * = 0: can send immediately 3037da7f456SGerrit Renker * < 0: error condition; do not send packet 3047da7f456SGerrit Renker */ 3056b57c93dSGerrit Renker static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) 3067c657876SArnaldo Carvalho de Melo { 3077c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 30859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3098132da4dSGerrit Renker ktime_t now = ktime_get_real(); 3108132da4dSGerrit Renker s64 delay; 3117c657876SArnaldo Carvalho de Melo 31259348b19SGerrit Renker BUG_ON(hctx == NULL); 3131f2333aeSArnaldo Carvalho de Melo 3147c657876SArnaldo Carvalho de Melo /* 315da335bafSGerrit Renker * This function is called only for Data and DataAck packets. Sending 316da335bafSGerrit Renker * zero-sized Data(Ack)s is theoretically possible, but for congestion 317da335bafSGerrit Renker * control this case is pathological - ignore it. 3187c657876SArnaldo Carvalho de Melo */ 3196b57c93dSGerrit Renker if (unlikely(skb->len == 0)) 320da335bafSGerrit Renker return -EBADMSG; 3217c657876SArnaldo Carvalho de Melo 3227c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3237c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3241f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3258109b02bSArnaldo Carvalho de Melo (jiffies + 3268109b02bSArnaldo Carvalho de Melo usecs_to_jiffies(TFRC_INITIAL_TIMEOUT))); 3277c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3287c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 32990feeb95SGerrit Renker 33090feeb95SGerrit Renker /* Set t_0 for initial packet */ 3317c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 33230833ffeSGerrit Renker 33330833ffeSGerrit Renker hctx->ccid3hctx_s = skb->len; 33430833ffeSGerrit Renker 33530833ffeSGerrit Renker /* 33630833ffeSGerrit Renker * Use initial RTT sample when available: recommended by erratum 33730833ffeSGerrit Renker * to RFC 4342. This implements the initialisation procedure of 33830833ffeSGerrit Renker * draft rfc3448bis, section 4.2. Remember, X is scaled by 2^6. 33930833ffeSGerrit Renker */ 34030833ffeSGerrit Renker if (dp->dccps_syn_rtt) { 34130833ffeSGerrit Renker ccid3_pr_debug("SYN RTT = %uus\n", dp->dccps_syn_rtt); 34230833ffeSGerrit Renker hctx->ccid3hctx_rtt = dp->dccps_syn_rtt; 34330833ffeSGerrit Renker hctx->ccid3hctx_x = rfc3390_initial_rate(sk); 34423f062afSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 34530833ffeSGerrit Renker } else { 34630833ffeSGerrit Renker /* Sender does not have RTT sample: X = MSS/second */ 34730833ffeSGerrit Renker hctx->ccid3hctx_x = dp->dccps_mss_cache; 34830833ffeSGerrit Renker hctx->ccid3hctx_x <<= 6; 34930833ffeSGerrit Renker } 35030833ffeSGerrit Renker ccid3_update_send_interval(hctx); 35130833ffeSGerrit Renker 35230833ffeSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3537c657876SArnaldo Carvalho de Melo break; 3547c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3557c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 3568132da4dSGerrit Renker delay = ktime_us_delta(hctx->ccid3hctx_t_nom, now); 3578699be7dSIan McDonald ccid3_pr_debug("delay=%ld\n", (long)delay); 35891cf5a17SGerrit Renker /* 35991cf5a17SGerrit Renker * Scheduling of packet transmissions [RFC 3448, 4.6] 36091cf5a17SGerrit Renker * 36191cf5a17SGerrit Renker * if (t_now > t_nom - delta) 36291cf5a17SGerrit Renker * // send the packet now 36391cf5a17SGerrit Renker * else 36491cf5a17SGerrit Renker * // send the packet in (t_nom - t_now) milliseconds. 36591cf5a17SGerrit Renker */ 36649d66a70SGerrit Renker if (delay - (s64)hctx->ccid3hctx_delta >= 1000) 3678132da4dSGerrit Renker return (u32)delay / 1000L; 3689f8681dbSGerrit Renker 3698132da4dSGerrit Renker ccid3_hc_tx_update_win_count(hctx, now); 3707c657876SArnaldo Carvalho de Melo break; 37159348b19SGerrit Renker case TFRC_SSTATE_TERM: 372a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 3737da7f456SGerrit Renker return -EINVAL; 3747c657876SArnaldo Carvalho de Melo } 3757c657876SArnaldo Carvalho de Melo 3767da7f456SGerrit Renker /* prepare to send now (add options etc.) */ 377507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 378e312d100SGerrit Renker DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 3790c150efbSGerrit Renker hctx->ccid3hctx_idle = 0; 380e312d100SGerrit Renker 381e312d100SGerrit Renker /* set the nominal send time for the next following packet */ 3828132da4dSGerrit Renker hctx->ccid3hctx_t_nom = ktime_add_us(hctx->ccid3hctx_t_nom, 3838132da4dSGerrit Renker hctx->ccid3hctx_t_ipi); 3847da7f456SGerrit Renker return 0; 3857c657876SArnaldo Carvalho de Melo } 3867c657876SArnaldo Carvalho de Melo 3878109b02bSArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, 3888109b02bSArnaldo Carvalho de Melo unsigned int len) 3897c657876SArnaldo Carvalho de Melo { 39059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3916b57c93dSGerrit Renker struct dccp_tx_hist_entry *packet; 3927c657876SArnaldo Carvalho de Melo 39359348b19SGerrit Renker BUG_ON(hctx == NULL); 3947c657876SArnaldo Carvalho de Melo 39578ad713dSGerrit Renker ccid3_hc_tx_update_s(hctx, len); 39678ad713dSGerrit Renker 397c5a1ae9aSGerrit Renker packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC); 39859d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 399c5a1ae9aSGerrit Renker DCCP_CRIT("packet history - out of memory!"); 4007c657876SArnaldo Carvalho de Melo return; 4017c657876SArnaldo Carvalho de Melo } 402c5a1ae9aSGerrit Renker dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, packet); 403c5a1ae9aSGerrit Renker 4040740d49cSArnaldo Carvalho de Melo packet->dccphtx_tstamp = ktime_get_real(); 405c5a1ae9aSGerrit Renker packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss; 406c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 4078c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 4087c657876SArnaldo Carvalho de Melo } 4097c657876SArnaldo Carvalho de Melo 4107c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 4117c657876SArnaldo Carvalho de Melo { 41259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 4137c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4148c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 4150740d49cSArnaldo Carvalho de Melo ktime_t now; 4162a1fda6fSGerrit Renker unsigned long t_nfb; 4177dfee1a9SGerrit Renker u32 pinv, r_sample; 4181f2333aeSArnaldo Carvalho de Melo 41959348b19SGerrit Renker BUG_ON(hctx == NULL); 4207c657876SArnaldo Carvalho de Melo 4217c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4227c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4237c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4247c657876SArnaldo Carvalho de Melo return; 4257c657876SArnaldo Carvalho de Melo 4267c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4277c657876SArnaldo Carvalho de Melo 4287c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4297c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4307c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4315c3fbb6aSGerrit Renker /* get packet from history to look up t_recvdata */ 4328c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4338c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 43459d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 4355c3fbb6aSGerrit Renker DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " 43659348b19SGerrit Renker "in history!\n", dccp_role(sk), sk, 43759d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4387c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4397c657876SArnaldo Carvalho de Melo return; 4407c657876SArnaldo Carvalho de Melo } 4417c657876SArnaldo Carvalho de Melo 4421a21e49aSGerrit Renker /* Update receive rate in units of 64 * bytes/second */ 4439e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; 4449e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 6; 4455c3fbb6aSGerrit Renker 4465c3fbb6aSGerrit Renker /* Update loss event rate */ 4475c3fbb6aSGerrit Renker pinv = opt_recv->ccid3or_loss_event_rate; 44845393a66SGerrit Renker if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ 4495c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 0; 45045393a66SGerrit Renker else /* can not exceed 100% */ 4515c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 1000000 / pinv; 4525c3fbb6aSGerrit Renker 4539823b7b5SArnaldo Carvalho de Melo now = ktime_get_real(); 4545c3fbb6aSGerrit Renker /* 4555c3fbb6aSGerrit Renker * Calculate new round trip sample as per [RFC 3448, 4.3] by 4565c3fbb6aSGerrit Renker * R_sample = (now - t_recvdata) - t_elapsed 4575c3fbb6aSGerrit Renker */ 4580740d49cSArnaldo Carvalho de Melo r_sample = dccp_sample_rtt(sk, now, &packet->dccphtx_tstamp); 4595c3fbb6aSGerrit Renker 4607dfee1a9SGerrit Renker /* 4617dfee1a9SGerrit Renker * Update RTT estimate by 4627c657876SArnaldo Carvalho de Melo * If (No feedback recv) 4637c657876SArnaldo Carvalho de Melo * R = R_sample; 4647c657876SArnaldo Carvalho de Melo * Else 4657c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 4667c657876SArnaldo Carvalho de Melo * 4677c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 4687c657876SArnaldo Carvalho de Melo */ 4697c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 4701a21e49aSGerrit Renker /* 4711a21e49aSGerrit Renker * Larger Initial Windows [RFC 4342, sec. 5] 4721a21e49aSGerrit Renker */ 4737c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 474a21f9f96SGerrit Renker hctx->ccid3hctx_x = rfc3390_initial_rate(sk); 4759823b7b5SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 476a79ef76fSGerrit Renker 4771266adeeSGerrit Renker ccid3_update_send_interval(hctx); 4785c3fbb6aSGerrit Renker 479a21f9f96SGerrit Renker ccid3_pr_debug("%s(%p), s=%u, MSS=%u, " 4807dfee1a9SGerrit Renker "R_sample=%uus, X=%u\n", dccp_role(sk), 4810f08461eSAndrew Morton sk, hctx->ccid3hctx_s, 4821b07a95aSDavid S. Miller dccp_sk(sk)->dccps_mss_cache, r_sample, 4831a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4845c3fbb6aSGerrit Renker 485a79ef76fSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 486a79ef76fSGerrit Renker } else { 4875c3fbb6aSGerrit Renker hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + 4887dfee1a9SGerrit Renker r_sample) / 10; 4895c3fbb6aSGerrit Renker 490ff586298SGerrit Renker /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ 491ff586298SGerrit Renker if (hctx->ccid3hctx_p > 0) 492ff586298SGerrit Renker hctx->ccid3hctx_x_calc = 493ff586298SGerrit Renker tfrc_calc_x(hctx->ccid3hctx_s, 494ff586298SGerrit Renker hctx->ccid3hctx_rtt, 495ff586298SGerrit Renker hctx->ccid3hctx_p); 496ac198ea8SArnaldo Carvalho de Melo ccid3_hc_tx_update_x(sk); 4977c657876SArnaldo Carvalho de Melo 4987dfee1a9SGerrit Renker ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, " 4998109b02bSArnaldo Carvalho de Melo "p=%u, X_calc=%u, X_recv=%u, X=%u\n", 5008109b02bSArnaldo Carvalho de Melo dccp_role(sk), 5017dfee1a9SGerrit Renker sk, hctx->ccid3hctx_rtt, r_sample, 5025c3fbb6aSGerrit Renker hctx->ccid3hctx_s, hctx->ccid3hctx_p, 5035c3fbb6aSGerrit Renker hctx->ccid3hctx_x_calc, 5049e8efc82SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6), 5051a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 5067c657876SArnaldo Carvalho de Melo } 5077c657876SArnaldo Carvalho de Melo 5087c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 5097c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5107c657876SArnaldo Carvalho de Melo 5117c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5128c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5138c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 514c530cfb1SArnaldo Carvalho de Melo /* 5158109b02bSArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible 5168109b02bSArnaldo Carvalho de Melo * that we now can send a packet, so wake up dccp_wait_for_ccid 517c530cfb1SArnaldo Carvalho de Melo */ 518c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5198c60f3faSArnaldo Carvalho de Melo 5208a508ac2SGerrit Renker /* 5218a508ac2SGerrit Renker * Update timeout interval for the nofeedback timer. 5228a508ac2SGerrit Renker * We use a configuration option to increase the lower bound. 5238109b02bSArnaldo Carvalho de Melo * This can help avoid triggering the nofeedback timer too 5248109b02bSArnaldo Carvalho de Melo * often ('spinning') on LANs with small RTTs. 5258a508ac2SGerrit Renker */ 5265d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 5278a508ac2SGerrit Renker CONFIG_IP_DCCP_CCID3_RTO * 5288a508ac2SGerrit Renker (USEC_PER_SEC/1000)); 5291f2333aeSArnaldo Carvalho de Melo /* 5301f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5318a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 5321f2333aeSArnaldo Carvalho de Melo */ 5338a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 5347c657876SArnaldo Carvalho de Melo 535a9672411SGerrit Renker ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " 5368109b02bSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5378109b02bSArnaldo Carvalho de Melo dccp_role(sk), 538a9672411SGerrit Renker sk, usecs_to_jiffies(t_nfb), t_nfb); 5397c657876SArnaldo Carvalho de Melo 5407c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5412a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 5427c657876SArnaldo Carvalho de Melo 5437c657876SArnaldo Carvalho de Melo /* set idle flag */ 5447c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5457c657876SArnaldo Carvalho de Melo break; 546151a9931SGerrit Renker case TFRC_SSTATE_NO_SENT: /* fall through */ 5475e19e3fcSGerrit Renker case TFRC_SSTATE_TERM: /* ignore feedback when closing */ 5487c657876SArnaldo Carvalho de Melo break; 5497c657876SArnaldo Carvalho de Melo } 5507c657876SArnaldo Carvalho de Melo } 5517c657876SArnaldo Carvalho de Melo 5527c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5531f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5541f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5557c657876SArnaldo Carvalho de Melo { 5567c657876SArnaldo Carvalho de Melo int rc = 0; 55759725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 55859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5597c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 5607c657876SArnaldo Carvalho de Melo 56159d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 5627c657876SArnaldo Carvalho de Melo 5637c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5647c657876SArnaldo Carvalho de Melo 5657c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5667c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5677c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5687c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5697c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5707c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5717c657876SArnaldo Carvalho de Melo } 5727c657876SArnaldo Carvalho de Melo 5737c657876SArnaldo Carvalho de Melo switch (option) { 5747c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 57559d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 576a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 57759348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 57859348b19SGerrit Renker dccp_role(sk), sk, len); 5797c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5807c657876SArnaldo Carvalho de Melo } else { 5818109b02bSArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = 5828109b02bSArnaldo Carvalho de Melo ntohl(*(__be32 *)value); 583a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", 5847c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5857c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 5867c657876SArnaldo Carvalho de Melo } 5877c657876SArnaldo Carvalho de Melo break; 5887c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 5897c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 5907c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 591a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n", 5927c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5937c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 5947c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 5957c657876SArnaldo Carvalho de Melo break; 5967c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 59759d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 598a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 59959348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 60059348b19SGerrit Renker dccp_role(sk), sk, len); 6017c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6027c657876SArnaldo Carvalho de Melo } else { 6038109b02bSArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 6048109b02bSArnaldo Carvalho de Melo ntohl(*(__be32 *)value); 605a9672411SGerrit Renker ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", 6067c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6077c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 6087c657876SArnaldo Carvalho de Melo } 6097c657876SArnaldo Carvalho de Melo break; 6107c657876SArnaldo Carvalho de Melo } 6117c657876SArnaldo Carvalho de Melo 6127c657876SArnaldo Carvalho de Melo return rc; 6137c657876SArnaldo Carvalho de Melo } 6147c657876SArnaldo Carvalho de Melo 61591f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 6167c657876SArnaldo Carvalho de Melo { 61791f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 6187c657876SArnaldo Carvalho de Melo 61978ad713dSGerrit Renker hctx->ccid3hctx_s = 0; 620fe0499aeSGerrit Renker hctx->ccid3hctx_rtt = 0; 6217c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6227c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 623aa5d7df3SArnaldo Carvalho de Melo 6248109b02bSArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = 6258109b02bSArnaldo Carvalho de Melo ccid3_hc_tx_no_feedback_timer; 626aa5d7df3SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 6277c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6287c657876SArnaldo Carvalho de Melo 6297c657876SArnaldo Carvalho de Melo return 0; 6307c657876SArnaldo Carvalho de Melo } 6317c657876SArnaldo Carvalho de Melo 6327c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6337c657876SArnaldo Carvalho de Melo { 63459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6357c657876SArnaldo Carvalho de Melo 6367c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 6377c657876SArnaldo Carvalho de Melo 6387c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6397c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6407c657876SArnaldo Carvalho de Melo 6417c657876SArnaldo Carvalho de Melo /* Empty packet history */ 6428c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 6437c657876SArnaldo Carvalho de Melo } 6447c657876SArnaldo Carvalho de Melo 6459bf17475SGerrit Renker static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 6469bf17475SGerrit Renker { 6479bf17475SGerrit Renker const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6487c657876SArnaldo Carvalho de Melo 6499bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6509bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6519bf17475SGerrit Renker return; 6529bf17475SGerrit Renker 6539bf17475SGerrit Renker BUG_ON(hctx == NULL); 6549bf17475SGerrit Renker 6559bf17475SGerrit Renker info->tcpi_rto = hctx->ccid3hctx_t_rto; 6569bf17475SGerrit Renker info->tcpi_rtt = hctx->ccid3hctx_rtt; 6579bf17475SGerrit Renker } 6589bf17475SGerrit Renker 6599bf17475SGerrit Renker static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 6609bf17475SGerrit Renker u32 __user *optval, int __user *optlen) 6619bf17475SGerrit Renker { 6629bf17475SGerrit Renker const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6639bf17475SGerrit Renker const void *val; 6649bf17475SGerrit Renker 6659bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6669bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6679bf17475SGerrit Renker return -EINVAL; 6689bf17475SGerrit Renker 6699bf17475SGerrit Renker switch (optname) { 6709bf17475SGerrit Renker case DCCP_SOCKOPT_CCID_TX_INFO: 6719bf17475SGerrit Renker if (len < sizeof(hctx->ccid3hctx_tfrc)) 6729bf17475SGerrit Renker return -EINVAL; 6739bf17475SGerrit Renker len = sizeof(hctx->ccid3hctx_tfrc); 6749bf17475SGerrit Renker val = &hctx->ccid3hctx_tfrc; 6759bf17475SGerrit Renker break; 6769bf17475SGerrit Renker default: 6779bf17475SGerrit Renker return -ENOPROTOOPT; 6789bf17475SGerrit Renker } 6799bf17475SGerrit Renker 6809bf17475SGerrit Renker if (put_user(len, optlen) || copy_to_user(optval, val, len)) 6819bf17475SGerrit Renker return -EFAULT; 6829bf17475SGerrit Renker 6839bf17475SGerrit Renker return 0; 6849bf17475SGerrit Renker } 6859bf17475SGerrit Renker 6869bf17475SGerrit Renker /* 6879bf17475SGerrit Renker * Receiver Half-Connection Routines 6889bf17475SGerrit Renker */ 68956724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6907c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6917c657876SArnaldo Carvalho de Melo { 6927c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6937c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6947c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6957c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6967c657876SArnaldo Carvalho de Melo }; 6977c657876SArnaldo Carvalho de Melo 6987c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6997c657876SArnaldo Carvalho de Melo } 7007c657876SArnaldo Carvalho de Melo #endif 7017c657876SArnaldo Carvalho de Melo 702c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 7031f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 7047c657876SArnaldo Carvalho de Melo { 70559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7067c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 7077c657876SArnaldo Carvalho de Melo 7087c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 7091f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 7101f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 7117c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 7127c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 7137c657876SArnaldo Carvalho de Melo } 7147c657876SArnaldo Carvalho de Melo 71578ad713dSGerrit Renker static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) 71678ad713dSGerrit Renker { 71778ad713dSGerrit Renker if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ 71878ad713dSGerrit Renker ccid3_pr_debug("Packet payload length is 0 - not updating\n"); 71978ad713dSGerrit Renker else 72078ad713dSGerrit Renker hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : 72178ad713dSGerrit Renker (9 * hcrx->ccid3hcrx_s + len) / 10; 72278ad713dSGerrit Renker } 72378ad713dSGerrit Renker 7247c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 7257c657876SArnaldo Carvalho de Melo { 72659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7277c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 7288c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 729e7c23357SArnaldo Carvalho de Melo ktime_t now; 7300f9e5b57SGerrit Renker suseconds_t delta; 7317c657876SArnaldo Carvalho de Melo 732a9672411SGerrit Renker ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk), sk); 7337c657876SArnaldo Carvalho de Melo 734e7a81c6dSArnaldo Carvalho de Melo now = ktime_get_real(); 735b6ee3d4aSArnaldo Carvalho de Melo 7367c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 7377c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 7387c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 7397c657876SArnaldo Carvalho de Melo break; 7400f9e5b57SGerrit Renker case TFRC_RSTATE_DATA: 741e7a81c6dSArnaldo Carvalho de Melo delta = ktime_us_delta(now, 742e7a81c6dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback); 7430f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 744b9039a2aSGerrit Renker hcrx->ccid3hcrx_x_recv = 745b9039a2aSGerrit Renker scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 7467c657876SArnaldo Carvalho de Melo break; 74759348b19SGerrit Renker case TFRC_RSTATE_TERM: 748a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 7497c657876SArnaldo Carvalho de Melo return; 7507c657876SArnaldo Carvalho de Melo } 7517c657876SArnaldo Carvalho de Melo 7528c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 75359d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 754a9672411SGerrit Renker DCCP_WARN("%s(%p), no data packet in history!\n", 75559348b19SGerrit Renker dccp_role(sk), sk); 7567c657876SArnaldo Carvalho de Melo return; 7577c657876SArnaldo Carvalho de Melo } 7587c657876SArnaldo Carvalho de Melo 759b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 76066a377c5SIan McDonald hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; 7617c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7627c657876SArnaldo Carvalho de Melo 7630f9e5b57SGerrit Renker /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */ 764e7c23357SArnaldo Carvalho de Melo delta = ktime_us_delta(now, packet->dccphrx_tstamp); 7650f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 7660f9e5b57SGerrit Renker hcrx->ccid3hcrx_elapsed_time = delta / 10; 76745393a66SGerrit Renker 7687c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 76945393a66SGerrit Renker hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ 77045393a66SGerrit Renker else if (hcrx->ccid3hcrx_p > 1000000) { 77145393a66SGerrit Renker DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); 77245393a66SGerrit Renker hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ 77345393a66SGerrit Renker } else 7747c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 77545393a66SGerrit Renker 776507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7777c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7787c657876SArnaldo Carvalho de Melo } 7797c657876SArnaldo Carvalho de Melo 7802d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7817c657876SArnaldo Carvalho de Melo { 78259d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 78360fe62e7SAndrea Bittau __be32 x_recv, pinv; 7847c657876SArnaldo Carvalho de Melo 78559d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 78659d203f9SArnaldo Carvalho de Melo 78759d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7882d0817d1SArnaldo Carvalho de Melo return 0; 7897c657876SArnaldo Carvalho de Melo 79066a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 7914fded33bSArnaldo Carvalho de Melo 7924fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7932d0817d1SArnaldo Carvalho de Melo return 0; 7944fded33bSArnaldo Carvalho de Melo 7954fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7964fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7972d0817d1SArnaldo Carvalho de Melo 7982d0817d1SArnaldo Carvalho de Melo if ((hcrx->ccid3hcrx_elapsed_time != 0 && 7992d0817d1SArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 8002d0817d1SArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time)) || 8012d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb) || 8024fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 8032d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 8044fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 8052d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 8062d0817d1SArnaldo Carvalho de Melo return -1; 8072d0817d1SArnaldo Carvalho de Melo 8082d0817d1SArnaldo Carvalho de Melo return 0; 8097c657876SArnaldo Carvalho de Melo } 8107c657876SArnaldo Carvalho de Melo 81166a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 81266a377c5SIan McDonald struct dccp_rx_hist_entry *packet) 8137c657876SArnaldo Carvalho de Melo { 81459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 8158109b02bSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *rx_hist = 8168109b02bSArnaldo Carvalho de Melo dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); 81766a377c5SIan McDonald u64 seqno = packet->dccphrx_seqno; 81866a377c5SIan McDonald u64 tmp_seqno; 81966a377c5SIan McDonald int loss = 0; 82066a377c5SIan McDonald u8 ccval; 8217c657876SArnaldo Carvalho de Melo 82266a377c5SIan McDonald 82366a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 82466a377c5SIan McDonald 82566a377c5SIan McDonald if (!rx_hist || 82666a377c5SIan McDonald follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 82766a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 82866a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 82966a377c5SIan McDonald goto detect_out; 83066a377c5SIan McDonald } 83166a377c5SIan McDonald 83266a377c5SIan McDonald 83366a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 83466a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 83566a377c5SIan McDonald loss = 1; 836cc4d6a3aSArnaldo Carvalho de Melo dccp_li_update_li(sk, 837d83258a3SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, 838d83258a3SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_hist, 839e7c23357SArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback, 840d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s, 841d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv, 842d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv, 843d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_seqno_nonloss, 84466a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 84566a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 84666a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 84766a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 84866a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 84966a377c5SIan McDonald while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 85066a377c5SIan McDonald tmp_seqno, &ccval)) { 85166a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 85266a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 85366a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 85466a377c5SIan McDonald } 85566a377c5SIan McDonald } 85666a377c5SIan McDonald 85766a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 85866a377c5SIan McDonald /* but works at moment */ 85966a377c5SIan McDonald if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 86066a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 86166a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 86266a377c5SIan McDonald } 86366a377c5SIan McDonald 86466a377c5SIan McDonald detect_out: 86566a377c5SIan McDonald dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 86666a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 86766a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 86866a377c5SIan McDonald return loss; 8697c657876SArnaldo Carvalho de Melo } 8707c657876SArnaldo Carvalho de Melo 8717c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 8727c657876SArnaldo Carvalho de Melo { 87359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 8744fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 8758c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 8767dfee1a9SGerrit Renker u32 p_prev, r_sample, rtt_prev; 87778ad713dSGerrit Renker int loss, payload_size; 8789823b7b5SArnaldo Carvalho de Melo ktime_t now; 8791f2333aeSArnaldo Carvalho de Melo 88059348b19SGerrit Renker BUG_ON(hcrx == NULL); 8817c657876SArnaldo Carvalho de Melo 88259725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 8834fded33bSArnaldo Carvalho de Melo 8847c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 8857c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 8867c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 8877c657876SArnaldo Carvalho de Melo return; 8889823b7b5SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 8894fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 8907c657876SArnaldo Carvalho de Melo break; 89166a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 8929823b7b5SArnaldo Carvalho de Melo now = ktime_get_real(); 8939823b7b5SArnaldo Carvalho de Melo r_sample = dccp_sample_rtt(sk, now, NULL); 894b3a3077dSArnaldo Carvalho de Melo 895b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 896b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 897b3a3077dSArnaldo Carvalho de Melo else 898b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 899b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 900b3a3077dSArnaldo Carvalho de Melo 90166a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 902a9672411SGerrit Renker ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n", 903a9672411SGerrit Renker dccp_role(sk), sk, hcrx->ccid3hcrx_rtt, 9044fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 9057c657876SArnaldo Carvalho de Melo break; 9067c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 9077c657876SArnaldo Carvalho de Melo break; 90859d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 9097c657876SArnaldo Carvalho de Melo return; 9107c657876SArnaldo Carvalho de Melo } 9117c657876SArnaldo Carvalho de Melo 912e7c23357SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, opt_recv->dccpor_ndp, 91354e6ecb2SChristoph Lameter skb, GFP_ATOMIC); 91459d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 915a9672411SGerrit Renker DCCP_WARN("%s(%p), Not enough mem to add rx packet " 91659348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 9177c657876SArnaldo Carvalho de Melo return; 9187c657876SArnaldo Carvalho de Melo } 9197c657876SArnaldo Carvalho de Melo 92066a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 9217c657876SArnaldo Carvalho de Melo 9227c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 9237c657876SArnaldo Carvalho de Melo return; 9247c657876SArnaldo Carvalho de Melo 92578ad713dSGerrit Renker payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; 92678ad713dSGerrit Renker ccid3_hc_rx_update_s(hcrx, payload_size); 92778ad713dSGerrit Renker 9287c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 9297c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 930a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial " 931a9672411SGerrit Renker "feedback\n", dccp_role(sk), sk, 9321f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 9337c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 9347c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 9357c657876SArnaldo Carvalho de Melo return; 9369823b7b5SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 93778ad713dSGerrit Renker hcrx->ccid3hcrx_bytes_recv += payload_size; 93866a377c5SIan McDonald if (loss) 939b6ee3d4aSArnaldo Carvalho de Melo break; 940b6ee3d4aSArnaldo Carvalho de Melo 9411faf0a1fSArnaldo Carvalho de Melo now = ktime_get_real(); 9421faf0a1fSArnaldo Carvalho de Melo if ((ktime_us_delta(now, hcrx->ccid3hcrx_tstamp_last_ack) - 9431faf0a1fSArnaldo Carvalho de Melo (s64)hcrx->ccid3hcrx_rtt) >= 0) { 944b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 9457c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 9467c657876SArnaldo Carvalho de Melo } 9477c657876SArnaldo Carvalho de Melo return; 94859348b19SGerrit Renker case TFRC_RSTATE_TERM: 949a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 9507c657876SArnaldo Carvalho de Melo return; 9517c657876SArnaldo Carvalho de Melo } 9527c657876SArnaldo Carvalho de Melo 9537c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 954a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n", 9554fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 9567c657876SArnaldo Carvalho de Melo 9577c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 9587c657876SArnaldo Carvalho de Melo 9597c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 960c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 961c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 962c0996660SIan McDonald 9637c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 964c0996660SIan McDonald if (i_mean != 0) 965c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 96659348b19SGerrit Renker } else 96759348b19SGerrit Renker DCCP_BUG("empty loss history"); 9687c657876SArnaldo Carvalho de Melo 9697c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 9707c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 9717c657876SArnaldo Carvalho de Melo return; 9727c657876SArnaldo Carvalho de Melo } 9737c657876SArnaldo Carvalho de Melo } 9747c657876SArnaldo Carvalho de Melo 97591f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 9767c657876SArnaldo Carvalho de Melo { 97791f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 9787c657876SArnaldo Carvalho de Melo 979a9672411SGerrit Renker ccid3_pr_debug("entry\n"); 9807c657876SArnaldo Carvalho de Melo 9817c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 9827c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 983ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 9841faf0a1fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = 985e7a81c6dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = ktime_get_real(); 98678ad713dSGerrit Renker hcrx->ccid3hcrx_s = 0; 987fe0499aeSGerrit Renker hcrx->ccid3hcrx_rtt = 0; 9887c657876SArnaldo Carvalho de Melo return 0; 9897c657876SArnaldo Carvalho de Melo } 9907c657876SArnaldo Carvalho de Melo 9917c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 9927c657876SArnaldo Carvalho de Melo { 99359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9947c657876SArnaldo Carvalho de Melo 99559d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 9967c657876SArnaldo Carvalho de Melo 9977c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 9987c657876SArnaldo Carvalho de Melo 9997c657876SArnaldo Carvalho de Melo /* Empty packet history */ 10008c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 10017c657876SArnaldo Carvalho de Melo 10027c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 1003cc4d6a3aSArnaldo Carvalho de Melo dccp_li_hist_purge(&hcrx->ccid3hcrx_li_hist); 10047c657876SArnaldo Carvalho de Melo } 10057c657876SArnaldo Carvalho de Melo 10062babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 10072babe1f6SArnaldo Carvalho de Melo { 100859725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 10092babe1f6SArnaldo Carvalho de Melo 101059c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 101159c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 101259c2353dSArnaldo Carvalho de Melo return; 101359c2353dSArnaldo Carvalho de Melo 101459d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 10152babe1f6SArnaldo Carvalho de Melo 10162babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 10172babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 10182babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 10192babe1f6SArnaldo Carvalho de Melo } 10202babe1f6SArnaldo Carvalho de Melo 102188f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 102288f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 102388f964dbSArnaldo Carvalho de Melo { 102488f964dbSArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 102588f964dbSArnaldo Carvalho de Melo const void *val; 102688f964dbSArnaldo Carvalho de Melo 102788f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 102888f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 102988f964dbSArnaldo Carvalho de Melo return -EINVAL; 103088f964dbSArnaldo Carvalho de Melo 103188f964dbSArnaldo Carvalho de Melo switch (optname) { 103288f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 103388f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 103488f964dbSArnaldo Carvalho de Melo return -EINVAL; 103588f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 103688f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 103788f964dbSArnaldo Carvalho de Melo break; 103888f964dbSArnaldo Carvalho de Melo default: 103988f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 104088f964dbSArnaldo Carvalho de Melo } 104188f964dbSArnaldo Carvalho de Melo 104288f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 104388f964dbSArnaldo Carvalho de Melo return -EFAULT; 104488f964dbSArnaldo Carvalho de Melo 104588f964dbSArnaldo Carvalho de Melo return 0; 104688f964dbSArnaldo Carvalho de Melo } 104788f964dbSArnaldo Carvalho de Melo 104891f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 10493dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 10507c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 10517c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 105291f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 10537c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 10547c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 10557c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 10567c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 10577c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 10587c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 105991f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 10607c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 10617c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 10627c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 10637c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 10642babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 10652babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 106688f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 106788f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 10687c657876SArnaldo Carvalho de Melo }; 10697c657876SArnaldo Carvalho de Melo 107056724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 10717c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 10727c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 107356724aa4SGerrit Renker #endif 10747c657876SArnaldo Carvalho de Melo 10757c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 10767c657876SArnaldo Carvalho de Melo { 10778c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 10787c657876SArnaldo Carvalho de Melo 10798c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 10808c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 10817c657876SArnaldo Carvalho de Melo goto out; 10827c657876SArnaldo Carvalho de Melo 10838c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 10848c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 10858c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 10867c657876SArnaldo Carvalho de Melo 10877c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 10887c657876SArnaldo Carvalho de Melo if (rc != 0) 1089cc4d6a3aSArnaldo Carvalho de Melo goto out_free_tx; 10907c657876SArnaldo Carvalho de Melo out: 10917c657876SArnaldo Carvalho de Melo return rc; 10928c60f3faSArnaldo Carvalho de Melo 10938c60f3faSArnaldo Carvalho de Melo out_free_tx: 10948c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 10958c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 10968c60f3faSArnaldo Carvalho de Melo out_free_rx: 10978c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 10988c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 10997c657876SArnaldo Carvalho de Melo goto out; 11007c657876SArnaldo Carvalho de Melo } 11017c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 11027c657876SArnaldo Carvalho de Melo 11037c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 11047c657876SArnaldo Carvalho de Melo { 11057c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 11067c657876SArnaldo Carvalho de Melo 11078c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 11088c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 11098c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 11107c657876SArnaldo Carvalho de Melo } 11118c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 11128c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 11138c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 11147c657876SArnaldo Carvalho de Melo } 11157c657876SArnaldo Carvalho de Melo } 11167c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 11177c657876SArnaldo Carvalho de Melo 1118e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 11191f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 11207c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 11217c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 11227c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1123