17c657876SArnaldo Carvalho de Melo /* 27c657876SArnaldo Carvalho de Melo * net/dccp/ccids/ccid3.c 37c657876SArnaldo Carvalho de Melo * 4b2f41ff4SIan McDonald * Copyright (c) 2005-7 The University of Waikato, Hamilton, New Zealand. 5b2f41ff4SIan McDonald * Copyright (c) 2005-7 Ian McDonald <ian.mcdonald@jandi.co.nz> 67c657876SArnaldo Carvalho de Melo * 77c657876SArnaldo Carvalho de Melo * An implementation of the DCCP protocol 87c657876SArnaldo Carvalho de Melo * 97c657876SArnaldo Carvalho de Melo * This code has been developed by the University of Waikato WAND 107c657876SArnaldo Carvalho de Melo * research group. For further information please see http://www.wand.net.nz/ 117c657876SArnaldo Carvalho de Melo * 127c657876SArnaldo Carvalho de Melo * This code also uses code from Lulea University, rereleased as GPL by its 137c657876SArnaldo Carvalho de Melo * authors: 147c657876SArnaldo Carvalho de Melo * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon 157c657876SArnaldo Carvalho de Melo * 167c657876SArnaldo Carvalho de Melo * Changes to meet Linux coding standards, to make it meet latest ccid3 draft 177c657876SArnaldo Carvalho de Melo * and to make it work as a loadable module in the DCCP stack written by 187c657876SArnaldo Carvalho de Melo * Arnaldo Carvalho de Melo <acme@conectiva.com.br>. 197c657876SArnaldo Carvalho de Melo * 207c657876SArnaldo Carvalho de Melo * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> 217c657876SArnaldo Carvalho de Melo * 227c657876SArnaldo Carvalho de Melo * This program is free software; you can redistribute it and/or modify 237c657876SArnaldo Carvalho de Melo * it under the terms of the GNU General Public License as published by 247c657876SArnaldo Carvalho de Melo * the Free Software Foundation; either version 2 of the License, or 257c657876SArnaldo Carvalho de Melo * (at your option) any later version. 267c657876SArnaldo Carvalho de Melo * 277c657876SArnaldo Carvalho de Melo * This program is distributed in the hope that it will be useful, 287c657876SArnaldo Carvalho de Melo * but WITHOUT ANY WARRANTY; without even the implied warranty of 297c657876SArnaldo Carvalho de Melo * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 307c657876SArnaldo Carvalho de Melo * GNU General Public License for more details. 317c657876SArnaldo Carvalho de Melo * 327c657876SArnaldo Carvalho de Melo * You should have received a copy of the GNU General Public License 337c657876SArnaldo Carvalho de Melo * along with this program; if not, write to the Free Software 347c657876SArnaldo Carvalho de Melo * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 357c657876SArnaldo Carvalho de Melo */ 367c657876SArnaldo Carvalho de Melo #include "../ccid.h" 377c657876SArnaldo Carvalho de Melo #include "../dccp.h" 384524b259SArnaldo Carvalho de Melo #include "lib/packet_history.h" 39ae6706f0SArnaldo Carvalho de Melo #include "lib/loss_interval.h" 4036729c1aSArnaldo Carvalho de Melo #include "lib/tfrc.h" 417c657876SArnaldo Carvalho de Melo #include "ccid3.h" 427c657876SArnaldo Carvalho de Melo 4376fd1e87SGerrit Renker #include <asm/unaligned.h> 4476fd1e87SGerrit Renker 4556724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 4656724aa4SGerrit Renker static int ccid3_debug; 4756724aa4SGerrit Renker #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) 487c657876SArnaldo Carvalho de Melo #else 497c657876SArnaldo Carvalho de Melo #define ccid3_pr_debug(format, a...) 507c657876SArnaldo Carvalho de Melo #endif 517c657876SArnaldo Carvalho de Melo 52a1d3a355SArnaldo Carvalho de Melo static struct dccp_rx_hist *ccid3_rx_hist; 537c657876SArnaldo Carvalho de Melo 549bf17475SGerrit Renker /* 559bf17475SGerrit Renker * Transmitter Half-Connection Routines 569bf17475SGerrit Renker */ 5756724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 587c657876SArnaldo Carvalho de Melo static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) 597c657876SArnaldo Carvalho de Melo { 607c657876SArnaldo Carvalho de Melo static char *ccid3_state_names[] = { 617c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_SENT] = "NO_SENT", 627c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", 637c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_FBACK] = "FBACK", 647c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_TERM] = "TERM", 657c657876SArnaldo Carvalho de Melo }; 667c657876SArnaldo Carvalho de Melo 677c657876SArnaldo Carvalho de Melo return ccid3_state_names[state]; 687c657876SArnaldo Carvalho de Melo } 697c657876SArnaldo Carvalho de Melo #endif 707c657876SArnaldo Carvalho de Melo 71c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_tx_set_state(struct sock *sk, 721f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_tx_states state) 737c657876SArnaldo Carvalho de Melo { 7459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 757c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; 767c657876SArnaldo Carvalho de Melo 777c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 781f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_tx_state_name(oldstate), 791f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(state)); 807c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 817c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = state; 827c657876SArnaldo Carvalho de Melo } 837c657876SArnaldo Carvalho de Melo 8417893bc1SGerrit Renker /* 856c08b2cfSGerrit Renker * Compute the initial sending rate X_init in the manner of RFC 3390: 866c08b2cfSGerrit Renker * 876c08b2cfSGerrit Renker * X_init = min(4 * s, max(2 * s, 4380 bytes)) / RTT 886c08b2cfSGerrit Renker * 896c08b2cfSGerrit Renker * Note that RFC 3390 uses MSS, RFC 4342 refers to RFC 3390, and rfc3448bis 906c08b2cfSGerrit Renker * (rev-02) clarifies the use of RFC 3390 with regard to the above formula. 91a21f9f96SGerrit Renker * For consistency with other parts of the code, X_init is scaled by 2^6. 92a21f9f96SGerrit Renker */ 93a21f9f96SGerrit Renker static inline u64 rfc3390_initial_rate(struct sock *sk) 94a21f9f96SGerrit Renker { 956c08b2cfSGerrit Renker const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 966c08b2cfSGerrit Renker const __u32 w_init = min_t(__u32, 4 * hctx->ccid3hctx_s, 976c08b2cfSGerrit Renker max_t(__u32, 2 * hctx->ccid3hctx_s, 4380)); 98a21f9f96SGerrit Renker 996c08b2cfSGerrit Renker return scaled_div(w_init << 6, hctx->ccid3hctx_rtt); 100a21f9f96SGerrit Renker } 101a21f9f96SGerrit Renker 102a21f9f96SGerrit Renker /* 1031266adeeSGerrit Renker * Recalculate t_ipi and delta (should be called whenever X changes) 10417893bc1SGerrit Renker */ 1051266adeeSGerrit Renker static inline void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hctx) 1067c657876SArnaldo Carvalho de Melo { 1071a21e49aSGerrit Renker /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */ 108b2449fdcSGerrit Renker hctx->ccid3hctx_t_ipi = scaled_div32(((u64)hctx->ccid3hctx_s) << 6, 109b2449fdcSGerrit Renker hctx->ccid3hctx_x); 11017893bc1SGerrit Renker 1117c657876SArnaldo Carvalho de Melo /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ 1121f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, 1131f2333aeSArnaldo Carvalho de Melo TFRC_OPSYS_HALF_TIME_GRAN); 1148699be7dSIan McDonald 1151761f7d7SGerrit Renker ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n", 1168699be7dSIan McDonald hctx->ccid3hctx_t_ipi, hctx->ccid3hctx_delta, 1171761f7d7SGerrit Renker hctx->ccid3hctx_s, (unsigned)(hctx->ccid3hctx_x >> 6)); 1188699be7dSIan McDonald 1197c657876SArnaldo Carvalho de Melo } 120aa97efd9SGerrit Renker 121a5358fdcSGerrit Renker static u32 ccid3_hc_tx_idle_rtt(struct ccid3_hc_tx_sock *hctx, ktime_t now) 122a5358fdcSGerrit Renker { 123a5358fdcSGerrit Renker u32 delta = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count); 124a5358fdcSGerrit Renker 125a5358fdcSGerrit Renker return delta / hctx->ccid3hctx_rtt; 126a5358fdcSGerrit Renker } 127a5358fdcSGerrit Renker 128aa97efd9SGerrit Renker /** 129aa97efd9SGerrit Renker * ccid3_hc_tx_update_x - Update allowed sending rate X 130aa97efd9SGerrit Renker * @stamp: most recent time if available - can be left NULL. 131aa97efd9SGerrit Renker * This function tracks draft rfc3448bis, check there for latest details. 1325c3fbb6aSGerrit Renker * 1331a21e49aSGerrit Renker * Note: X and X_recv are both stored in units of 64 * bytes/second, to support 1341a21e49aSGerrit Renker * fine-grained resolution of sending rates. This requires scaling by 2^6 1351a21e49aSGerrit Renker * throughout the code. Only X_calc is unscaled (in bytes/second). 1361a21e49aSGerrit Renker * 1377c657876SArnaldo Carvalho de Melo */ 138aa97efd9SGerrit Renker static void ccid3_hc_tx_update_x(struct sock *sk, ktime_t *stamp) 139a79ef76fSGerrit Renker 1407c657876SArnaldo Carvalho de Melo { 14159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1420c150efbSGerrit Renker __u64 min_rate = 2 * hctx->ccid3hctx_x_recv; 1431a21e49aSGerrit Renker const __u64 old_x = hctx->ccid3hctx_x; 144aa97efd9SGerrit Renker ktime_t now = stamp? *stamp : ktime_get_real(); 1457c657876SArnaldo Carvalho de Melo 1460c150efbSGerrit Renker /* 1470c150efbSGerrit Renker * Handle IDLE periods: do not reduce below RFC3390 initial sending rate 148a5358fdcSGerrit Renker * when idling [RFC 4342, 5.1]. Definition of idling is from rfc3448bis: 149a5358fdcSGerrit Renker * a sender is idle if it has not sent anything over a 2-RTT-period. 1500c150efbSGerrit Renker * For consistency with X and X_recv, min_rate is also scaled by 2^6. 1510c150efbSGerrit Renker */ 152a5358fdcSGerrit Renker if (ccid3_hc_tx_idle_rtt(hctx, now) >= 2) { 1530c150efbSGerrit Renker min_rate = rfc3390_initial_rate(sk); 1540c150efbSGerrit Renker min_rate = max(min_rate, 2 * hctx->ccid3hctx_x_recv); 1550c150efbSGerrit Renker } 1560c150efbSGerrit Renker 15744158306SGerrit Renker if (hctx->ccid3hctx_p > 0) { 1581a21e49aSGerrit Renker 1599e8efc82SGerrit Renker hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6, 1600c150efbSGerrit Renker min_rate); 1619e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, 1629e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 1639e8efc82SGerrit Renker TFRC_T_MBI); 164b6ee3d4aSArnaldo Carvalho de Melo 165aa97efd9SGerrit Renker } else if (ktime_us_delta(now, hctx->ccid3hctx_t_ld) 166aa97efd9SGerrit Renker - (s64)hctx->ccid3hctx_rtt >= 0) { 1671a21e49aSGerrit Renker 1689e8efc82SGerrit Renker hctx->ccid3hctx_x = 1690c150efbSGerrit Renker max(min(2 * hctx->ccid3hctx_x, min_rate), 1709e8efc82SGerrit Renker scaled_div(((__u64)hctx->ccid3hctx_s) << 6, 1716b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 172ac198ea8SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 173ac198ea8SArnaldo Carvalho de Melo } 174a79ef76fSGerrit Renker 1758699be7dSIan McDonald if (hctx->ccid3hctx_x != old_x) { 1761761f7d7SGerrit Renker ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, " 1771761f7d7SGerrit Renker "X_recv=%u\n", (unsigned)(old_x >> 6), 1781761f7d7SGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6), 1791761f7d7SGerrit Renker hctx->ccid3hctx_x_calc, 1801761f7d7SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6)); 1818699be7dSIan McDonald 1821266adeeSGerrit Renker ccid3_update_send_interval(hctx); 1837c657876SArnaldo Carvalho de Melo } 1848699be7dSIan McDonald } 1857c657876SArnaldo Carvalho de Melo 18678ad713dSGerrit Renker /* 18778ad713dSGerrit Renker * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) 18878ad713dSGerrit Renker * @len: DCCP packet payload size in bytes 18978ad713dSGerrit Renker */ 19078ad713dSGerrit Renker static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) 19178ad713dSGerrit Renker { 1921266adeeSGerrit Renker const u16 old_s = hctx->ccid3hctx_s; 1931266adeeSGerrit Renker 194c3ada46aSGerrit Renker hctx->ccid3hctx_s = tfrc_ewma(hctx->ccid3hctx_s, len, 9); 1951266adeeSGerrit Renker 1961266adeeSGerrit Renker if (hctx->ccid3hctx_s != old_s) 1971266adeeSGerrit Renker ccid3_update_send_interval(hctx); 19878ad713dSGerrit Renker } 19978ad713dSGerrit Renker 2009f8681dbSGerrit Renker /* 2019f8681dbSGerrit Renker * Update Window Counter using the algorithm from [RFC 4342, 8.1]. 2029f8681dbSGerrit Renker * The algorithm is not applicable if RTT < 4 microseconds. 2039f8681dbSGerrit Renker */ 2049f8681dbSGerrit Renker static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, 2058132da4dSGerrit Renker ktime_t now) 2069f8681dbSGerrit Renker { 2079f8681dbSGerrit Renker u32 quarter_rtts; 2089f8681dbSGerrit Renker 2099f8681dbSGerrit Renker if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ 2109f8681dbSGerrit Renker return; 2119f8681dbSGerrit Renker 2128132da4dSGerrit Renker quarter_rtts = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count); 2138132da4dSGerrit Renker quarter_rtts /= hctx->ccid3hctx_rtt / 4; 2149f8681dbSGerrit Renker 2159f8681dbSGerrit Renker if (quarter_rtts > 0) { 2168132da4dSGerrit Renker hctx->ccid3hctx_t_last_win_count = now; 2179f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); 2189f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ 2199f8681dbSGerrit Renker } 2209f8681dbSGerrit Renker } 2219f8681dbSGerrit Renker 2227c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 2237c657876SArnaldo Carvalho de Melo { 2247c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 22559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2262a1fda6fSGerrit Renker unsigned long t_nfb = USEC_PER_SEC / 5; 2277c657876SArnaldo Carvalho de Melo 2287c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 2297c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 2307c657876SArnaldo Carvalho de Melo /* Try again later. */ 2317c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 23248e03eeeSGerrit Renker goto restart_timer; 2337c657876SArnaldo Carvalho de Melo } 2347c657876SArnaldo Carvalho de Melo 235a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk, 2367c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2377c657876SArnaldo Carvalho de Melo 2387c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 2397c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 240a79ef76fSGerrit Renker /* RFC 3448, 4.4: Halve send rate directly */ 2419e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2, 2429e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2439e8efc82SGerrit Renker TFRC_T_MBI); 2447c657876SArnaldo Carvalho de Melo 245a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u " 246a9672411SGerrit Renker "bytes/s\n", dccp_role(sk), sk, 2471f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 2481a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 24948e03eeeSGerrit Renker /* The value of R is still undefined and so we can not recompute 2505e8e034cSJoe Perches * the timeout value. Keep initial value as per [RFC 4342, 5]. */ 2512a1fda6fSGerrit Renker t_nfb = TFRC_INITIAL_TIMEOUT; 2521266adeeSGerrit Renker ccid3_update_send_interval(hctx); 2537c657876SArnaldo Carvalho de Melo break; 2547c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 2551f2333aeSArnaldo Carvalho de Melo /* 256ff586298SGerrit Renker * Modify the cached value of X_recv [RFC 3448, 4.4] 257ff586298SGerrit Renker * 258ff586298SGerrit Renker * If (p == 0 || X_calc > 2 * X_recv) 2597c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2607c657876SArnaldo Carvalho de Melo * Else 2617c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2621a21e49aSGerrit Renker * 2631a21e49aSGerrit Renker * Note that X_recv is scaled by 2^6 while X_calc is not 2647c657876SArnaldo Carvalho de Melo */ 26544158306SGerrit Renker BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); 2667c657876SArnaldo Carvalho de Melo 26744158306SGerrit Renker if (hctx->ccid3hctx_p == 0 || 2680c150efbSGerrit Renker (hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5))) { 2691a21e49aSGerrit Renker 2701a21e49aSGerrit Renker hctx->ccid3hctx_x_recv = 2719e8efc82SGerrit Renker max(hctx->ccid3hctx_x_recv / 2, 2729e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2731a21e49aSGerrit Renker (2 * TFRC_T_MBI)); 2749e8efc82SGerrit Renker } else { 2759e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc; 2769e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 4; 2779e8efc82SGerrit Renker } 278ff586298SGerrit Renker /* Now recalculate X [RFC 3448, 4.3, step (4)] */ 279aa97efd9SGerrit Renker ccid3_hc_tx_update_x(sk, NULL); 2806b5e633aSArnaldo Carvalho de Melo /* 2816b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2828a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 2838a508ac2SGerrit Renker * See comments in packet_recv() regarding the value of t_RTO. 2846b5e633aSArnaldo Carvalho de Melo */ 2858a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 2867c657876SArnaldo Carvalho de Melo break; 28759348b19SGerrit Renker case TFRC_SSTATE_NO_SENT: 288a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk), sk); 28959348b19SGerrit Renker /* fall through */ 29059348b19SGerrit Renker case TFRC_SSTATE_TERM: 2917c657876SArnaldo Carvalho de Melo goto out; 2927c657876SArnaldo Carvalho de Melo } 2937c657876SArnaldo Carvalho de Melo 29448e03eeeSGerrit Renker restart_timer: 29548e03eeeSGerrit Renker sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2962a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 2977c657876SArnaldo Carvalho de Melo out: 2987c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2997c657876SArnaldo Carvalho de Melo sock_put(sk); 3007c657876SArnaldo Carvalho de Melo } 3017c657876SArnaldo Carvalho de Melo 3027da7f456SGerrit Renker /* 3037da7f456SGerrit Renker * returns 3047da7f456SGerrit Renker * > 0: delay (in msecs) that should pass before actually sending 3057da7f456SGerrit Renker * = 0: can send immediately 3067da7f456SGerrit Renker * < 0: error condition; do not send packet 3077da7f456SGerrit Renker */ 3086b57c93dSGerrit Renker static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) 3097c657876SArnaldo Carvalho de Melo { 3107c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 31159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3128132da4dSGerrit Renker ktime_t now = ktime_get_real(); 3138132da4dSGerrit Renker s64 delay; 3147c657876SArnaldo Carvalho de Melo 3157c657876SArnaldo Carvalho de Melo /* 316da335bafSGerrit Renker * This function is called only for Data and DataAck packets. Sending 317da335bafSGerrit Renker * zero-sized Data(Ack)s is theoretically possible, but for congestion 318da335bafSGerrit Renker * control this case is pathological - ignore it. 3197c657876SArnaldo Carvalho de Melo */ 3206b57c93dSGerrit Renker if (unlikely(skb->len == 0)) 321da335bafSGerrit Renker return -EBADMSG; 3227c657876SArnaldo Carvalho de Melo 3237c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3247c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3251f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3268109b02bSArnaldo Carvalho de Melo (jiffies + 3278109b02bSArnaldo Carvalho de Melo usecs_to_jiffies(TFRC_INITIAL_TIMEOUT))); 3287c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3297c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 33090feeb95SGerrit Renker 33190feeb95SGerrit Renker /* Set t_0 for initial packet */ 3327c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 33330833ffeSGerrit Renker 33430833ffeSGerrit Renker hctx->ccid3hctx_s = skb->len; 33530833ffeSGerrit Renker 33630833ffeSGerrit Renker /* 33730833ffeSGerrit Renker * Use initial RTT sample when available: recommended by erratum 33830833ffeSGerrit Renker * to RFC 4342. This implements the initialisation procedure of 33930833ffeSGerrit Renker * draft rfc3448bis, section 4.2. Remember, X is scaled by 2^6. 34030833ffeSGerrit Renker */ 34130833ffeSGerrit Renker if (dp->dccps_syn_rtt) { 34230833ffeSGerrit Renker ccid3_pr_debug("SYN RTT = %uus\n", dp->dccps_syn_rtt); 34330833ffeSGerrit Renker hctx->ccid3hctx_rtt = dp->dccps_syn_rtt; 34430833ffeSGerrit Renker hctx->ccid3hctx_x = rfc3390_initial_rate(sk); 34523f062afSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 34630833ffeSGerrit Renker } else { 3476c08b2cfSGerrit Renker /* Sender does not have RTT sample: X_pps = 1 pkt/sec */ 3486c08b2cfSGerrit Renker hctx->ccid3hctx_x = hctx->ccid3hctx_s; 34930833ffeSGerrit Renker hctx->ccid3hctx_x <<= 6; 35030833ffeSGerrit Renker } 35130833ffeSGerrit Renker ccid3_update_send_interval(hctx); 35230833ffeSGerrit Renker 35330833ffeSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3547c657876SArnaldo Carvalho de Melo break; 3557c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3567c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 3578132da4dSGerrit Renker delay = ktime_us_delta(hctx->ccid3hctx_t_nom, now); 3588699be7dSIan McDonald ccid3_pr_debug("delay=%ld\n", (long)delay); 35991cf5a17SGerrit Renker /* 36091cf5a17SGerrit Renker * Scheduling of packet transmissions [RFC 3448, 4.6] 36191cf5a17SGerrit Renker * 36291cf5a17SGerrit Renker * if (t_now > t_nom - delta) 36391cf5a17SGerrit Renker * // send the packet now 36491cf5a17SGerrit Renker * else 36591cf5a17SGerrit Renker * // send the packet in (t_nom - t_now) milliseconds. 36691cf5a17SGerrit Renker */ 36749d66a70SGerrit Renker if (delay - (s64)hctx->ccid3hctx_delta >= 1000) 3688132da4dSGerrit Renker return (u32)delay / 1000L; 3699f8681dbSGerrit Renker 3708132da4dSGerrit Renker ccid3_hc_tx_update_win_count(hctx, now); 3717c657876SArnaldo Carvalho de Melo break; 37259348b19SGerrit Renker case TFRC_SSTATE_TERM: 373a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 3747da7f456SGerrit Renker return -EINVAL; 3757c657876SArnaldo Carvalho de Melo } 3767c657876SArnaldo Carvalho de Melo 3777da7f456SGerrit Renker /* prepare to send now (add options etc.) */ 378507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 379e312d100SGerrit Renker DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 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); 3917c657876SArnaldo Carvalho de Melo 39278ad713dSGerrit Renker ccid3_hc_tx_update_s(hctx, len); 39378ad713dSGerrit Renker 394276f2edcSArnaldo Carvalho de Melo if (tfrc_tx_hist_add(&hctx->ccid3hctx_hist, dccp_sk(sk)->dccps_gss)) 395c5a1ae9aSGerrit Renker DCCP_CRIT("packet history - out of memory!"); 3967c657876SArnaldo Carvalho de Melo } 3977c657876SArnaldo Carvalho de Melo 3987c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 3997c657876SArnaldo Carvalho de Melo { 40059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 4017c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 402276f2edcSArnaldo Carvalho de Melo struct tfrc_tx_hist_entry *packet; 4030740d49cSArnaldo Carvalho de Melo ktime_t now; 4042a1fda6fSGerrit Renker unsigned long t_nfb; 4057dfee1a9SGerrit Renker u32 pinv, r_sample; 4061f2333aeSArnaldo Carvalho de Melo 4077c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4087c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4097c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4107c657876SArnaldo Carvalho de Melo return; 4117c657876SArnaldo Carvalho de Melo 4127c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4137c657876SArnaldo Carvalho de Melo 4147c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4157c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4167c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 417276f2edcSArnaldo Carvalho de Melo /* estimate RTT from history if ACK number is valid */ 418276f2edcSArnaldo Carvalho de Melo packet = tfrc_tx_hist_find_entry(hctx->ccid3hctx_hist, 4198c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 420276f2edcSArnaldo Carvalho de Melo if (packet == NULL) { 421276f2edcSArnaldo Carvalho de Melo DCCP_WARN("%s(%p): %s with bogus ACK-%llu\n", dccp_role(sk), sk, 422276f2edcSArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type), 423276f2edcSArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq); 4247c657876SArnaldo Carvalho de Melo return; 4257c657876SArnaldo Carvalho de Melo } 426276f2edcSArnaldo Carvalho de Melo /* 427276f2edcSArnaldo Carvalho de Melo * Garbage-collect older (irrelevant) entries 428276f2edcSArnaldo Carvalho de Melo */ 429276f2edcSArnaldo Carvalho de Melo tfrc_tx_hist_purge(&packet->next); 4307c657876SArnaldo Carvalho de Melo 4311a21e49aSGerrit Renker /* Update receive rate in units of 64 * bytes/second */ 4329e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; 4339e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 6; 4345c3fbb6aSGerrit Renker 4355c3fbb6aSGerrit Renker /* Update loss event rate */ 4365c3fbb6aSGerrit Renker pinv = opt_recv->ccid3or_loss_event_rate; 43745393a66SGerrit Renker if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ 4385c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 0; 43945393a66SGerrit Renker else /* can not exceed 100% */ 4405c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 1000000 / pinv; 4415c3fbb6aSGerrit Renker 4429823b7b5SArnaldo Carvalho de Melo now = ktime_get_real(); 4435c3fbb6aSGerrit Renker /* 444c3ada46aSGerrit Renker * Calculate new RTT sample and update moving average 4455c3fbb6aSGerrit Renker */ 446276f2edcSArnaldo Carvalho de Melo r_sample = dccp_sample_rtt(sk, ktime_us_delta(now, packet->stamp)); 447c3ada46aSGerrit Renker hctx->ccid3hctx_rtt = tfrc_ewma(hctx->ccid3hctx_rtt, r_sample, 9); 4485c3fbb6aSGerrit Renker 4497c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 4501a21e49aSGerrit Renker /* 4511a21e49aSGerrit Renker * Larger Initial Windows [RFC 4342, sec. 5] 4521a21e49aSGerrit Renker */ 453a21f9f96SGerrit Renker hctx->ccid3hctx_x = rfc3390_initial_rate(sk); 4549823b7b5SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 455a79ef76fSGerrit Renker 4561266adeeSGerrit Renker ccid3_update_send_interval(hctx); 4575c3fbb6aSGerrit Renker 458a21f9f96SGerrit Renker ccid3_pr_debug("%s(%p), s=%u, MSS=%u, " 4597dfee1a9SGerrit Renker "R_sample=%uus, X=%u\n", dccp_role(sk), 4600f08461eSAndrew Morton sk, hctx->ccid3hctx_s, 4611b07a95aSDavid S. Miller dccp_sk(sk)->dccps_mss_cache, r_sample, 4621a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4635c3fbb6aSGerrit Renker 464a79ef76fSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 465a79ef76fSGerrit Renker } else { 4665c3fbb6aSGerrit Renker 467ff586298SGerrit Renker /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ 468ff586298SGerrit Renker if (hctx->ccid3hctx_p > 0) 469ff586298SGerrit Renker hctx->ccid3hctx_x_calc = 470ff586298SGerrit Renker tfrc_calc_x(hctx->ccid3hctx_s, 471ff586298SGerrit Renker hctx->ccid3hctx_rtt, 472ff586298SGerrit Renker hctx->ccid3hctx_p); 473aa97efd9SGerrit Renker ccid3_hc_tx_update_x(sk, &now); 4747c657876SArnaldo Carvalho de Melo 4757dfee1a9SGerrit Renker ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, " 4768109b02bSArnaldo Carvalho de Melo "p=%u, X_calc=%u, X_recv=%u, X=%u\n", 4778109b02bSArnaldo Carvalho de Melo dccp_role(sk), 4787dfee1a9SGerrit Renker sk, hctx->ccid3hctx_rtt, r_sample, 4795c3fbb6aSGerrit Renker hctx->ccid3hctx_s, hctx->ccid3hctx_p, 4805c3fbb6aSGerrit Renker hctx->ccid3hctx_x_calc, 4819e8efc82SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6), 4821a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4837c657876SArnaldo Carvalho de Melo } 4847c657876SArnaldo Carvalho de Melo 4857c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 4867c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 4877c657876SArnaldo Carvalho de Melo 488c530cfb1SArnaldo Carvalho de Melo /* 4898109b02bSArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible 4908109b02bSArnaldo Carvalho de Melo * that we now can send a packet, so wake up dccp_wait_for_ccid 491c530cfb1SArnaldo Carvalho de Melo */ 492c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 4938c60f3faSArnaldo Carvalho de Melo 4948a508ac2SGerrit Renker /* 4958a508ac2SGerrit Renker * Update timeout interval for the nofeedback timer. 4968a508ac2SGerrit Renker * We use a configuration option to increase the lower bound. 4978109b02bSArnaldo Carvalho de Melo * This can help avoid triggering the nofeedback timer too 4988109b02bSArnaldo Carvalho de Melo * often ('spinning') on LANs with small RTTs. 4998a508ac2SGerrit Renker */ 5005d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 5018a508ac2SGerrit Renker CONFIG_IP_DCCP_CCID3_RTO * 5028a508ac2SGerrit Renker (USEC_PER_SEC/1000)); 5031f2333aeSArnaldo Carvalho de Melo /* 5041f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5058a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 5061f2333aeSArnaldo Carvalho de Melo */ 5078a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 5087c657876SArnaldo Carvalho de Melo 509a9672411SGerrit Renker ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " 5108109b02bSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5118109b02bSArnaldo Carvalho de Melo dccp_role(sk), 512a9672411SGerrit Renker sk, usecs_to_jiffies(t_nfb), t_nfb); 5137c657876SArnaldo Carvalho de Melo 5147c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5152a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 5167c657876SArnaldo Carvalho de Melo break; 517151a9931SGerrit Renker case TFRC_SSTATE_NO_SENT: /* fall through */ 5185e19e3fcSGerrit Renker case TFRC_SSTATE_TERM: /* ignore feedback when closing */ 5197c657876SArnaldo Carvalho de Melo break; 5207c657876SArnaldo Carvalho de Melo } 5217c657876SArnaldo Carvalho de Melo } 5227c657876SArnaldo Carvalho de Melo 5237c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5241f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5251f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5267c657876SArnaldo Carvalho de Melo { 5277c657876SArnaldo Carvalho de Melo int rc = 0; 52859725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 52959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5307c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 53176fd1e87SGerrit Renker __be32 opt_val; 5327c657876SArnaldo Carvalho de Melo 5337c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5347c657876SArnaldo Carvalho de Melo 5357c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5367c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5377c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5387c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5397c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5407c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5417c657876SArnaldo Carvalho de Melo } 5427c657876SArnaldo Carvalho de Melo 5437c657876SArnaldo Carvalho de Melo switch (option) { 5447c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 54559d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 546a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 54759348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 54859348b19SGerrit Renker dccp_role(sk), sk, len); 5497c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5507c657876SArnaldo Carvalho de Melo } else { 55176fd1e87SGerrit Renker opt_val = get_unaligned((__be32 *)value); 55276fd1e87SGerrit Renker opt_recv->ccid3or_loss_event_rate = ntohl(opt_val); 553a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", 5547c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5557c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 5567c657876SArnaldo Carvalho de Melo } 5577c657876SArnaldo Carvalho de Melo break; 5587c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 5597c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 5607c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 561a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n", 5627c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5637c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 5647c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 5657c657876SArnaldo Carvalho de Melo break; 5667c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 56759d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 568a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 56959348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 57059348b19SGerrit Renker dccp_role(sk), sk, len); 5717c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5727c657876SArnaldo Carvalho de Melo } else { 57376fd1e87SGerrit Renker opt_val = get_unaligned((__be32 *)value); 57476fd1e87SGerrit Renker opt_recv->ccid3or_receive_rate = ntohl(opt_val); 575a9672411SGerrit Renker ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", 5767c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5777c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 5787c657876SArnaldo Carvalho de Melo } 5797c657876SArnaldo Carvalho de Melo break; 5807c657876SArnaldo Carvalho de Melo } 5817c657876SArnaldo Carvalho de Melo 5827c657876SArnaldo Carvalho de Melo return rc; 5837c657876SArnaldo Carvalho de Melo } 5847c657876SArnaldo Carvalho de Melo 58591f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 5867c657876SArnaldo Carvalho de Melo { 58791f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 5887c657876SArnaldo Carvalho de Melo 5897c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 590276f2edcSArnaldo Carvalho de Melo hctx->ccid3hctx_hist = NULL; 591b24b8a24SPavel Emelyanov setup_timer(&hctx->ccid3hctx_no_feedback_timer, 592b24b8a24SPavel Emelyanov ccid3_hc_tx_no_feedback_timer, (unsigned long)sk); 5937c657876SArnaldo Carvalho de Melo 5947c657876SArnaldo Carvalho de Melo return 0; 5957c657876SArnaldo Carvalho de Melo } 5967c657876SArnaldo Carvalho de Melo 5977c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 5987c657876SArnaldo Carvalho de Melo { 59959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6007c657876SArnaldo Carvalho de Melo 6017c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6027c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6037c657876SArnaldo Carvalho de Melo 604276f2edcSArnaldo Carvalho de Melo tfrc_tx_hist_purge(&hctx->ccid3hctx_hist); 6057c657876SArnaldo Carvalho de Melo } 6067c657876SArnaldo Carvalho de Melo 6079bf17475SGerrit Renker static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 6089bf17475SGerrit Renker { 6092e86908fSGerrit Renker struct ccid3_hc_tx_sock *hctx; 6107c657876SArnaldo Carvalho de Melo 6119bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6129bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6139bf17475SGerrit Renker return; 6149bf17475SGerrit Renker 6152e86908fSGerrit Renker hctx = ccid3_hc_tx_sk(sk); 6169bf17475SGerrit Renker info->tcpi_rto = hctx->ccid3hctx_t_rto; 6179bf17475SGerrit Renker info->tcpi_rtt = hctx->ccid3hctx_rtt; 6189bf17475SGerrit Renker } 6199bf17475SGerrit Renker 6209bf17475SGerrit Renker static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 6219bf17475SGerrit Renker u32 __user *optval, int __user *optlen) 6229bf17475SGerrit Renker { 6232e86908fSGerrit Renker const struct ccid3_hc_tx_sock *hctx; 6249bf17475SGerrit Renker const void *val; 6259bf17475SGerrit Renker 6269bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6279bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6289bf17475SGerrit Renker return -EINVAL; 6299bf17475SGerrit Renker 6302e86908fSGerrit Renker hctx = ccid3_hc_tx_sk(sk); 6319bf17475SGerrit Renker switch (optname) { 6329bf17475SGerrit Renker case DCCP_SOCKOPT_CCID_TX_INFO: 6339bf17475SGerrit Renker if (len < sizeof(hctx->ccid3hctx_tfrc)) 6349bf17475SGerrit Renker return -EINVAL; 6359bf17475SGerrit Renker len = sizeof(hctx->ccid3hctx_tfrc); 6369bf17475SGerrit Renker val = &hctx->ccid3hctx_tfrc; 6379bf17475SGerrit Renker break; 6389bf17475SGerrit Renker default: 6399bf17475SGerrit Renker return -ENOPROTOOPT; 6409bf17475SGerrit Renker } 6419bf17475SGerrit Renker 6429bf17475SGerrit Renker if (put_user(len, optlen) || copy_to_user(optval, val, len)) 6439bf17475SGerrit Renker return -EFAULT; 6449bf17475SGerrit Renker 6459bf17475SGerrit Renker return 0; 6469bf17475SGerrit Renker } 6479bf17475SGerrit Renker 6489bf17475SGerrit Renker /* 6499bf17475SGerrit Renker * Receiver Half-Connection Routines 6509bf17475SGerrit Renker */ 65156724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6527c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6537c657876SArnaldo Carvalho de Melo { 6547c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6557c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6567c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6577c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6587c657876SArnaldo Carvalho de Melo }; 6597c657876SArnaldo Carvalho de Melo 6607c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6617c657876SArnaldo Carvalho de Melo } 6627c657876SArnaldo Carvalho de Melo #endif 6637c657876SArnaldo Carvalho de Melo 664c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 6651f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 6667c657876SArnaldo Carvalho de Melo { 66759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6687c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 6697c657876SArnaldo Carvalho de Melo 6707c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 6711f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 6721f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 6737c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 6747c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 6757c657876SArnaldo Carvalho de Melo } 6767c657876SArnaldo Carvalho de Melo 67778ad713dSGerrit Renker static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) 67878ad713dSGerrit Renker { 679c3ada46aSGerrit Renker if (likely(len > 0)) /* don't update on empty packets (e.g. ACKs) */ 680c3ada46aSGerrit Renker hcrx->ccid3hcrx_s = tfrc_ewma(hcrx->ccid3hcrx_s, len, 9); 68178ad713dSGerrit Renker } 68278ad713dSGerrit Renker 6837c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 6847c657876SArnaldo Carvalho de Melo { 68559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6867c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 6878c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 688e7c23357SArnaldo Carvalho de Melo ktime_t now; 6890f9e5b57SGerrit Renker suseconds_t delta; 6907c657876SArnaldo Carvalho de Melo 691a9672411SGerrit Renker ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk), sk); 6927c657876SArnaldo Carvalho de Melo 693e7a81c6dSArnaldo Carvalho de Melo now = ktime_get_real(); 694b6ee3d4aSArnaldo Carvalho de Melo 6957c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 6967c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 6977c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 6987c657876SArnaldo Carvalho de Melo break; 6990f9e5b57SGerrit Renker case TFRC_RSTATE_DATA: 700e7a81c6dSArnaldo Carvalho de Melo delta = ktime_us_delta(now, 701e7a81c6dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback); 7020f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 703b9039a2aSGerrit Renker hcrx->ccid3hcrx_x_recv = 704b9039a2aSGerrit Renker scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 7057c657876SArnaldo Carvalho de Melo break; 70659348b19SGerrit Renker case TFRC_RSTATE_TERM: 707a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 7087c657876SArnaldo Carvalho de Melo return; 7097c657876SArnaldo Carvalho de Melo } 7107c657876SArnaldo Carvalho de Melo 7118c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 71259d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 713a9672411SGerrit Renker DCCP_WARN("%s(%p), no data packet in history!\n", 71459348b19SGerrit Renker dccp_role(sk), sk); 7157c657876SArnaldo Carvalho de Melo return; 7167c657876SArnaldo Carvalho de Melo } 7177c657876SArnaldo Carvalho de Melo 718b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 71966a377c5SIan McDonald hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; 7207c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7217c657876SArnaldo Carvalho de Melo 7227c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 72345393a66SGerrit Renker hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ 72445393a66SGerrit Renker else if (hcrx->ccid3hcrx_p > 1000000) { 72545393a66SGerrit Renker DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); 72645393a66SGerrit Renker hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ 72745393a66SGerrit Renker } else 7287c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 72945393a66SGerrit Renker 730507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7317c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7327c657876SArnaldo Carvalho de Melo } 7337c657876SArnaldo Carvalho de Melo 7342d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7357c657876SArnaldo Carvalho de Melo { 7362e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 73760fe62e7SAndrea Bittau __be32 x_recv, pinv; 7387c657876SArnaldo Carvalho de Melo 73959d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7402d0817d1SArnaldo Carvalho de Melo return 0; 7417c657876SArnaldo Carvalho de Melo 7422e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 74366a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 7444fded33bSArnaldo Carvalho de Melo 7454fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7462d0817d1SArnaldo Carvalho de Melo return 0; 7474fded33bSArnaldo Carvalho de Melo 7484fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7494fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7502d0817d1SArnaldo Carvalho de Melo 751eb279b79SGerrit Renker if (dccp_insert_option_timestamp(sk, skb) || 7524fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7532d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7544fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 7552d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 7562d0817d1SArnaldo Carvalho de Melo return -1; 7572d0817d1SArnaldo Carvalho de Melo 7582d0817d1SArnaldo Carvalho de Melo return 0; 7597c657876SArnaldo Carvalho de Melo } 7607c657876SArnaldo Carvalho de Melo 76166a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 76266a377c5SIan McDonald struct dccp_rx_hist_entry *packet) 7637c657876SArnaldo Carvalho de Melo { 76459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7658109b02bSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *rx_hist = 7668109b02bSArnaldo Carvalho de Melo dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); 76766a377c5SIan McDonald u64 seqno = packet->dccphrx_seqno; 76866a377c5SIan McDonald u64 tmp_seqno; 76966a377c5SIan McDonald int loss = 0; 77066a377c5SIan McDonald u8 ccval; 7717c657876SArnaldo Carvalho de Melo 77266a377c5SIan McDonald 77366a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 77466a377c5SIan McDonald 77566a377c5SIan McDonald if (!rx_hist || 77666a377c5SIan McDonald follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 77766a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 77866a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 77966a377c5SIan McDonald goto detect_out; 78066a377c5SIan McDonald } 78166a377c5SIan McDonald 78266a377c5SIan McDonald 78366a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 78466a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 78566a377c5SIan McDonald loss = 1; 786cc4d6a3aSArnaldo Carvalho de Melo dccp_li_update_li(sk, 787d83258a3SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, 788d83258a3SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_hist, 789e7c23357SArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback, 790d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s, 791d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv, 792d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv, 793d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_seqno_nonloss, 79466a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 79566a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 79666a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 79766a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 79866a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 79966a377c5SIan McDonald while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 80066a377c5SIan McDonald tmp_seqno, &ccval)) { 80166a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 80266a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 80366a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 80466a377c5SIan McDonald } 80566a377c5SIan McDonald } 80666a377c5SIan McDonald 80766a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 80866a377c5SIan McDonald /* but works at moment */ 80966a377c5SIan McDonald if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 81066a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 81166a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; 81266a377c5SIan McDonald } 81366a377c5SIan McDonald 81466a377c5SIan McDonald detect_out: 81566a377c5SIan McDonald dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 81666a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 81766a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 81866a377c5SIan McDonald return loss; 8197c657876SArnaldo Carvalho de Melo } 8207c657876SArnaldo Carvalho de Melo 8217c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 8227c657876SArnaldo Carvalho de Melo { 82359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 8244fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 8258c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 8267dfee1a9SGerrit Renker u32 p_prev, r_sample, rtt_prev; 82778ad713dSGerrit Renker int loss, payload_size; 8289823b7b5SArnaldo Carvalho de Melo ktime_t now; 8291f2333aeSArnaldo Carvalho de Melo 83059725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 8314fded33bSArnaldo Carvalho de Melo 8327c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 8337c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 8347c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 8357c657876SArnaldo Carvalho de Melo return; 8369823b7b5SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 8374fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 8387c657876SArnaldo Carvalho de Melo break; 8393393da82SGerrit Renker r_sample = dccp_timestamp() - opt_recv->dccpor_timestamp_echo; 84066a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 8413393da82SGerrit Renker r_sample = dccp_sample_rtt(sk, 10 * r_sample); 842b3a3077dSArnaldo Carvalho de Melo 843b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 844b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 845b3a3077dSArnaldo Carvalho de Melo else 846b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 847b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 848b3a3077dSArnaldo Carvalho de Melo 84966a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 850a9672411SGerrit Renker ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n", 851a9672411SGerrit Renker dccp_role(sk), sk, hcrx->ccid3hcrx_rtt, 8524fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 8537c657876SArnaldo Carvalho de Melo break; 8547c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 8557c657876SArnaldo Carvalho de Melo break; 85659d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 8577c657876SArnaldo Carvalho de Melo return; 8587c657876SArnaldo Carvalho de Melo } 8597c657876SArnaldo Carvalho de Melo 860e7c23357SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, opt_recv->dccpor_ndp, 86154e6ecb2SChristoph Lameter skb, GFP_ATOMIC); 86259d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 863a9672411SGerrit Renker DCCP_WARN("%s(%p), Not enough mem to add rx packet " 86459348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 8657c657876SArnaldo Carvalho de Melo return; 8667c657876SArnaldo Carvalho de Melo } 8677c657876SArnaldo Carvalho de Melo 86866a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 8697c657876SArnaldo Carvalho de Melo 8707c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 8717c657876SArnaldo Carvalho de Melo return; 8727c657876SArnaldo Carvalho de Melo 87378ad713dSGerrit Renker payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; 87478ad713dSGerrit Renker ccid3_hc_rx_update_s(hcrx, payload_size); 87578ad713dSGerrit Renker 8767c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 8777c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 878a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial " 879a9672411SGerrit Renker "feedback\n", dccp_role(sk), sk, 8801f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 8817c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 8827c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 8837c657876SArnaldo Carvalho de Melo return; 8849823b7b5SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 88578ad713dSGerrit Renker hcrx->ccid3hcrx_bytes_recv += payload_size; 88666a377c5SIan McDonald if (loss) 887b6ee3d4aSArnaldo Carvalho de Melo break; 888b6ee3d4aSArnaldo Carvalho de Melo 8891faf0a1fSArnaldo Carvalho de Melo now = ktime_get_real(); 8901faf0a1fSArnaldo Carvalho de Melo if ((ktime_us_delta(now, hcrx->ccid3hcrx_tstamp_last_ack) - 8911faf0a1fSArnaldo Carvalho de Melo (s64)hcrx->ccid3hcrx_rtt) >= 0) { 892b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 8937c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 8947c657876SArnaldo Carvalho de Melo } 8957c657876SArnaldo Carvalho de Melo return; 89659348b19SGerrit Renker case TFRC_RSTATE_TERM: 897a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 8987c657876SArnaldo Carvalho de Melo return; 8997c657876SArnaldo Carvalho de Melo } 9007c657876SArnaldo Carvalho de Melo 9017c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 902a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n", 9034fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 9047c657876SArnaldo Carvalho de Melo 9057c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 9067c657876SArnaldo Carvalho de Melo 9077c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 908c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 909c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 910c0996660SIan McDonald 9117c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 912c0996660SIan McDonald if (i_mean != 0) 913c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 91459348b19SGerrit Renker } else 91559348b19SGerrit Renker DCCP_BUG("empty loss history"); 9167c657876SArnaldo Carvalho de Melo 9177c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 9187c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 9197c657876SArnaldo Carvalho de Melo return; 9207c657876SArnaldo Carvalho de Melo } 9217c657876SArnaldo Carvalho de Melo } 9227c657876SArnaldo Carvalho de Melo 92391f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 9247c657876SArnaldo Carvalho de Melo { 92591f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 9267c657876SArnaldo Carvalho de Melo 927a9672411SGerrit Renker ccid3_pr_debug("entry\n"); 9287c657876SArnaldo Carvalho de Melo 9297c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 9307c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 931ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 9321faf0a1fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = 933e7a81c6dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = ktime_get_real(); 9347c657876SArnaldo Carvalho de Melo return 0; 9357c657876SArnaldo Carvalho de Melo } 9367c657876SArnaldo Carvalho de Melo 9377c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 9387c657876SArnaldo Carvalho de Melo { 93959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9407c657876SArnaldo Carvalho de Melo 9417c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 9427c657876SArnaldo Carvalho de Melo 9437c657876SArnaldo Carvalho de Melo /* Empty packet history */ 9448c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 9457c657876SArnaldo Carvalho de Melo 9467c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 947cc4d6a3aSArnaldo Carvalho de Melo dccp_li_hist_purge(&hcrx->ccid3hcrx_li_hist); 9487c657876SArnaldo Carvalho de Melo } 9497c657876SArnaldo Carvalho de Melo 9502babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 9512babe1f6SArnaldo Carvalho de Melo { 9522e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 9532babe1f6SArnaldo Carvalho de Melo 95459c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 95559c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 95659c2353dSArnaldo Carvalho de Melo return; 95759c2353dSArnaldo Carvalho de Melo 9582e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 9592babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 9602babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 9612babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 9622babe1f6SArnaldo Carvalho de Melo } 9632babe1f6SArnaldo Carvalho de Melo 96488f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 96588f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 96688f964dbSArnaldo Carvalho de Melo { 9672e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 96888f964dbSArnaldo Carvalho de Melo const void *val; 96988f964dbSArnaldo Carvalho de Melo 97088f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 97188f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 97288f964dbSArnaldo Carvalho de Melo return -EINVAL; 97388f964dbSArnaldo Carvalho de Melo 9742e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 97588f964dbSArnaldo Carvalho de Melo switch (optname) { 97688f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 97788f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 97888f964dbSArnaldo Carvalho de Melo return -EINVAL; 97988f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 98088f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 98188f964dbSArnaldo Carvalho de Melo break; 98288f964dbSArnaldo Carvalho de Melo default: 98388f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 98488f964dbSArnaldo Carvalho de Melo } 98588f964dbSArnaldo Carvalho de Melo 98688f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 98788f964dbSArnaldo Carvalho de Melo return -EFAULT; 98888f964dbSArnaldo Carvalho de Melo 98988f964dbSArnaldo Carvalho de Melo return 0; 99088f964dbSArnaldo Carvalho de Melo } 99188f964dbSArnaldo Carvalho de Melo 99291f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 9933dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 9947c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 9957c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 99691f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 9977c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 9987c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 9997c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 10007c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 10017c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 10027c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 100391f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 10047c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 10057c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 10067c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 10077c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 10082babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 10092babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 101088f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 101188f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 10127c657876SArnaldo Carvalho de Melo }; 10137c657876SArnaldo Carvalho de Melo 101456724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 1015042d18f9SGerrit Renker module_param(ccid3_debug, bool, 0444); 10167c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 101756724aa4SGerrit Renker #endif 10187c657876SArnaldo Carvalho de Melo 10197c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 10207c657876SArnaldo Carvalho de Melo { 10218c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 10227c657876SArnaldo Carvalho de Melo 10238c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 10248c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 10257c657876SArnaldo Carvalho de Melo goto out; 10267c657876SArnaldo Carvalho de Melo 10277c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 10287c657876SArnaldo Carvalho de Melo if (rc != 0) 1029276f2edcSArnaldo Carvalho de Melo goto out_free_rx; 10307c657876SArnaldo Carvalho de Melo out: 10317c657876SArnaldo Carvalho de Melo return rc; 10328c60f3faSArnaldo Carvalho de Melo 10338c60f3faSArnaldo Carvalho de Melo out_free_rx: 10348c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 10358c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 10367c657876SArnaldo Carvalho de Melo goto out; 10377c657876SArnaldo Carvalho de Melo } 10387c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 10397c657876SArnaldo Carvalho de Melo 10407c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 10417c657876SArnaldo Carvalho de Melo { 10427c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 10437c657876SArnaldo Carvalho de Melo 10448c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 10458c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 10468c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 10477c657876SArnaldo Carvalho de Melo } 10487c657876SArnaldo Carvalho de Melo } 10497c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 10507c657876SArnaldo Carvalho de Melo 1051e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 10521f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 10537c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 10547c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 10557c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1056