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 529bf17475SGerrit Renker /* 539bf17475SGerrit Renker * Transmitter Half-Connection Routines 549bf17475SGerrit Renker */ 5556724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 567c657876SArnaldo Carvalho de Melo static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) 577c657876SArnaldo Carvalho de Melo { 587c657876SArnaldo Carvalho de Melo static char *ccid3_state_names[] = { 597c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_SENT] = "NO_SENT", 607c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", 617c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_FBACK] = "FBACK", 627c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_TERM] = "TERM", 637c657876SArnaldo Carvalho de Melo }; 647c657876SArnaldo Carvalho de Melo 657c657876SArnaldo Carvalho de Melo return ccid3_state_names[state]; 667c657876SArnaldo Carvalho de Melo } 677c657876SArnaldo Carvalho de Melo #endif 687c657876SArnaldo Carvalho de Melo 69c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_tx_set_state(struct sock *sk, 701f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_tx_states state) 717c657876SArnaldo Carvalho de Melo { 7259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 737c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; 747c657876SArnaldo Carvalho de Melo 757c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 761f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_tx_state_name(oldstate), 771f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(state)); 787c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 797c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = state; 807c657876SArnaldo Carvalho de Melo } 817c657876SArnaldo Carvalho de Melo 8217893bc1SGerrit Renker /* 836c08b2cfSGerrit Renker * Compute the initial sending rate X_init in the manner of RFC 3390: 846c08b2cfSGerrit Renker * 856c08b2cfSGerrit Renker * X_init = min(4 * s, max(2 * s, 4380 bytes)) / RTT 866c08b2cfSGerrit Renker * 876c08b2cfSGerrit Renker * Note that RFC 3390 uses MSS, RFC 4342 refers to RFC 3390, and rfc3448bis 886c08b2cfSGerrit Renker * (rev-02) clarifies the use of RFC 3390 with regard to the above formula. 89a21f9f96SGerrit Renker * For consistency with other parts of the code, X_init is scaled by 2^6. 90a21f9f96SGerrit Renker */ 91a21f9f96SGerrit Renker static inline u64 rfc3390_initial_rate(struct sock *sk) 92a21f9f96SGerrit Renker { 936c08b2cfSGerrit Renker const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 946c08b2cfSGerrit Renker const __u32 w_init = min_t(__u32, 4 * hctx->ccid3hctx_s, 956c08b2cfSGerrit Renker max_t(__u32, 2 * hctx->ccid3hctx_s, 4380)); 96a21f9f96SGerrit Renker 976c08b2cfSGerrit Renker return scaled_div(w_init << 6, hctx->ccid3hctx_rtt); 98a21f9f96SGerrit Renker } 99a21f9f96SGerrit Renker 100a21f9f96SGerrit Renker /* 1011266adeeSGerrit Renker * Recalculate t_ipi and delta (should be called whenever X changes) 10217893bc1SGerrit Renker */ 1031266adeeSGerrit Renker static inline void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hctx) 1047c657876SArnaldo Carvalho de Melo { 1051a21e49aSGerrit Renker /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */ 106b2449fdcSGerrit Renker hctx->ccid3hctx_t_ipi = scaled_div32(((u64)hctx->ccid3hctx_s) << 6, 107b2449fdcSGerrit Renker hctx->ccid3hctx_x); 10817893bc1SGerrit Renker 1097c657876SArnaldo Carvalho de Melo /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ 1101f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, 1111f2333aeSArnaldo Carvalho de Melo TFRC_OPSYS_HALF_TIME_GRAN); 1128699be7dSIan McDonald 1131761f7d7SGerrit Renker ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n", 1148699be7dSIan McDonald hctx->ccid3hctx_t_ipi, hctx->ccid3hctx_delta, 1151761f7d7SGerrit Renker hctx->ccid3hctx_s, (unsigned)(hctx->ccid3hctx_x >> 6)); 1168699be7dSIan McDonald 1177c657876SArnaldo Carvalho de Melo } 118aa97efd9SGerrit Renker 119a5358fdcSGerrit Renker static u32 ccid3_hc_tx_idle_rtt(struct ccid3_hc_tx_sock *hctx, ktime_t now) 120a5358fdcSGerrit Renker { 121a5358fdcSGerrit Renker u32 delta = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count); 122a5358fdcSGerrit Renker 123a5358fdcSGerrit Renker return delta / hctx->ccid3hctx_rtt; 124a5358fdcSGerrit Renker } 125a5358fdcSGerrit Renker 126aa97efd9SGerrit Renker /** 127aa97efd9SGerrit Renker * ccid3_hc_tx_update_x - Update allowed sending rate X 128aa97efd9SGerrit Renker * @stamp: most recent time if available - can be left NULL. 129aa97efd9SGerrit Renker * This function tracks draft rfc3448bis, check there for latest details. 1305c3fbb6aSGerrit Renker * 1311a21e49aSGerrit Renker * Note: X and X_recv are both stored in units of 64 * bytes/second, to support 1321a21e49aSGerrit Renker * fine-grained resolution of sending rates. This requires scaling by 2^6 1331a21e49aSGerrit Renker * throughout the code. Only X_calc is unscaled (in bytes/second). 1341a21e49aSGerrit Renker * 1357c657876SArnaldo Carvalho de Melo */ 136aa97efd9SGerrit Renker static void ccid3_hc_tx_update_x(struct sock *sk, ktime_t *stamp) 137a79ef76fSGerrit Renker 1387c657876SArnaldo Carvalho de Melo { 13959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1400c150efbSGerrit Renker __u64 min_rate = 2 * hctx->ccid3hctx_x_recv; 1411a21e49aSGerrit Renker const __u64 old_x = hctx->ccid3hctx_x; 142aa97efd9SGerrit Renker ktime_t now = stamp? *stamp : ktime_get_real(); 1437c657876SArnaldo Carvalho de Melo 1440c150efbSGerrit Renker /* 1450c150efbSGerrit Renker * Handle IDLE periods: do not reduce below RFC3390 initial sending rate 146a5358fdcSGerrit Renker * when idling [RFC 4342, 5.1]. Definition of idling is from rfc3448bis: 147a5358fdcSGerrit Renker * a sender is idle if it has not sent anything over a 2-RTT-period. 1480c150efbSGerrit Renker * For consistency with X and X_recv, min_rate is also scaled by 2^6. 1490c150efbSGerrit Renker */ 150a5358fdcSGerrit Renker if (ccid3_hc_tx_idle_rtt(hctx, now) >= 2) { 1510c150efbSGerrit Renker min_rate = rfc3390_initial_rate(sk); 1520c150efbSGerrit Renker min_rate = max(min_rate, 2 * hctx->ccid3hctx_x_recv); 1530c150efbSGerrit Renker } 1540c150efbSGerrit Renker 15544158306SGerrit Renker if (hctx->ccid3hctx_p > 0) { 1561a21e49aSGerrit Renker 1579e8efc82SGerrit Renker hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6, 1580c150efbSGerrit Renker min_rate); 1599e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, 1609e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 1619e8efc82SGerrit Renker TFRC_T_MBI); 162b6ee3d4aSArnaldo Carvalho de Melo 163aa97efd9SGerrit Renker } else if (ktime_us_delta(now, hctx->ccid3hctx_t_ld) 164aa97efd9SGerrit Renker - (s64)hctx->ccid3hctx_rtt >= 0) { 1651a21e49aSGerrit Renker 1669e8efc82SGerrit Renker hctx->ccid3hctx_x = 1670c150efbSGerrit Renker max(min(2 * hctx->ccid3hctx_x, min_rate), 1689e8efc82SGerrit Renker scaled_div(((__u64)hctx->ccid3hctx_s) << 6, 1696b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 170ac198ea8SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 171ac198ea8SArnaldo Carvalho de Melo } 172a79ef76fSGerrit Renker 1738699be7dSIan McDonald if (hctx->ccid3hctx_x != old_x) { 1741761f7d7SGerrit Renker ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, " 1751761f7d7SGerrit Renker "X_recv=%u\n", (unsigned)(old_x >> 6), 1761761f7d7SGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6), 1771761f7d7SGerrit Renker hctx->ccid3hctx_x_calc, 1781761f7d7SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6)); 1798699be7dSIan McDonald 1801266adeeSGerrit Renker ccid3_update_send_interval(hctx); 1817c657876SArnaldo Carvalho de Melo } 1828699be7dSIan McDonald } 1837c657876SArnaldo Carvalho de Melo 18478ad713dSGerrit Renker /* 18578ad713dSGerrit Renker * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) 18678ad713dSGerrit Renker * @len: DCCP packet payload size in bytes 18778ad713dSGerrit Renker */ 18878ad713dSGerrit Renker static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) 18978ad713dSGerrit Renker { 1901266adeeSGerrit Renker const u16 old_s = hctx->ccid3hctx_s; 1911266adeeSGerrit Renker 192c3ada46aSGerrit Renker hctx->ccid3hctx_s = tfrc_ewma(hctx->ccid3hctx_s, len, 9); 1931266adeeSGerrit Renker 1941266adeeSGerrit Renker if (hctx->ccid3hctx_s != old_s) 1951266adeeSGerrit Renker ccid3_update_send_interval(hctx); 19678ad713dSGerrit Renker } 19778ad713dSGerrit Renker 1989f8681dbSGerrit Renker /* 1999f8681dbSGerrit Renker * Update Window Counter using the algorithm from [RFC 4342, 8.1]. 2009f8681dbSGerrit Renker * The algorithm is not applicable if RTT < 4 microseconds. 2019f8681dbSGerrit Renker */ 2029f8681dbSGerrit Renker static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, 2038132da4dSGerrit Renker ktime_t now) 2049f8681dbSGerrit Renker { 2059f8681dbSGerrit Renker u32 quarter_rtts; 2069f8681dbSGerrit Renker 2079f8681dbSGerrit Renker if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ 2089f8681dbSGerrit Renker return; 2099f8681dbSGerrit Renker 2108132da4dSGerrit Renker quarter_rtts = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count); 2118132da4dSGerrit Renker quarter_rtts /= hctx->ccid3hctx_rtt / 4; 2129f8681dbSGerrit Renker 2139f8681dbSGerrit Renker if (quarter_rtts > 0) { 2148132da4dSGerrit Renker hctx->ccid3hctx_t_last_win_count = now; 2159f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); 2169f8681dbSGerrit Renker hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ 2179f8681dbSGerrit Renker } 2189f8681dbSGerrit Renker } 2199f8681dbSGerrit Renker 2207c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 2217c657876SArnaldo Carvalho de Melo { 2227c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 22359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2242a1fda6fSGerrit Renker unsigned long t_nfb = USEC_PER_SEC / 5; 2257c657876SArnaldo Carvalho de Melo 2267c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 2277c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 2287c657876SArnaldo Carvalho de Melo /* Try again later. */ 2297c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 23048e03eeeSGerrit Renker goto restart_timer; 2317c657876SArnaldo Carvalho de Melo } 2327c657876SArnaldo Carvalho de Melo 233a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk, 2347c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2357c657876SArnaldo Carvalho de Melo 2367c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 2377c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 238a79ef76fSGerrit Renker /* RFC 3448, 4.4: Halve send rate directly */ 2399e8efc82SGerrit Renker hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2, 2409e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2419e8efc82SGerrit Renker TFRC_T_MBI); 2427c657876SArnaldo Carvalho de Melo 243a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u " 244a9672411SGerrit Renker "bytes/s\n", dccp_role(sk), sk, 2451f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 2461a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 24748e03eeeSGerrit Renker /* The value of R is still undefined and so we can not recompute 2485e8e034cSJoe Perches * the timeout value. Keep initial value as per [RFC 4342, 5]. */ 2492a1fda6fSGerrit Renker t_nfb = TFRC_INITIAL_TIMEOUT; 2501266adeeSGerrit Renker ccid3_update_send_interval(hctx); 2517c657876SArnaldo Carvalho de Melo break; 2527c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 2531f2333aeSArnaldo Carvalho de Melo /* 254ff586298SGerrit Renker * Modify the cached value of X_recv [RFC 3448, 4.4] 255ff586298SGerrit Renker * 256ff586298SGerrit Renker * If (p == 0 || X_calc > 2 * X_recv) 2577c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2587c657876SArnaldo Carvalho de Melo * Else 2597c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2601a21e49aSGerrit Renker * 2611a21e49aSGerrit Renker * Note that X_recv is scaled by 2^6 while X_calc is not 2627c657876SArnaldo Carvalho de Melo */ 26344158306SGerrit Renker BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); 2647c657876SArnaldo Carvalho de Melo 26544158306SGerrit Renker if (hctx->ccid3hctx_p == 0 || 2660c150efbSGerrit Renker (hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5))) { 2671a21e49aSGerrit Renker 2681a21e49aSGerrit Renker hctx->ccid3hctx_x_recv = 2699e8efc82SGerrit Renker max(hctx->ccid3hctx_x_recv / 2, 2709e8efc82SGerrit Renker (((__u64)hctx->ccid3hctx_s) << 6) / 2711a21e49aSGerrit Renker (2 * TFRC_T_MBI)); 2729e8efc82SGerrit Renker } else { 2739e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc; 2749e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 4; 2759e8efc82SGerrit Renker } 276ff586298SGerrit Renker /* Now recalculate X [RFC 3448, 4.3, step (4)] */ 277aa97efd9SGerrit Renker ccid3_hc_tx_update_x(sk, NULL); 2786b5e633aSArnaldo Carvalho de Melo /* 2796b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2808a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 2818a508ac2SGerrit Renker * See comments in packet_recv() regarding the value of t_RTO. 2826b5e633aSArnaldo Carvalho de Melo */ 2838a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 2847c657876SArnaldo Carvalho de Melo break; 28559348b19SGerrit Renker case TFRC_SSTATE_NO_SENT: 286a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk), sk); 28759348b19SGerrit Renker /* fall through */ 28859348b19SGerrit Renker case TFRC_SSTATE_TERM: 2897c657876SArnaldo Carvalho de Melo goto out; 2907c657876SArnaldo Carvalho de Melo } 2917c657876SArnaldo Carvalho de Melo 29248e03eeeSGerrit Renker restart_timer: 29348e03eeeSGerrit Renker sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2942a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 2957c657876SArnaldo Carvalho de Melo out: 2967c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2977c657876SArnaldo Carvalho de Melo sock_put(sk); 2987c657876SArnaldo Carvalho de Melo } 2997c657876SArnaldo Carvalho de Melo 3007da7f456SGerrit Renker /* 3017da7f456SGerrit Renker * returns 3027da7f456SGerrit Renker * > 0: delay (in msecs) that should pass before actually sending 3037da7f456SGerrit Renker * = 0: can send immediately 3047da7f456SGerrit Renker * < 0: error condition; do not send packet 3057da7f456SGerrit Renker */ 3066b57c93dSGerrit Renker static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) 3077c657876SArnaldo Carvalho de Melo { 3087c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 30959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3108132da4dSGerrit Renker ktime_t now = ktime_get_real(); 3118132da4dSGerrit Renker s64 delay; 3127c657876SArnaldo Carvalho de Melo 3137c657876SArnaldo Carvalho de Melo /* 314da335bafSGerrit Renker * This function is called only for Data and DataAck packets. Sending 315da335bafSGerrit Renker * zero-sized Data(Ack)s is theoretically possible, but for congestion 316da335bafSGerrit Renker * control this case is pathological - ignore it. 3177c657876SArnaldo Carvalho de Melo */ 3186b57c93dSGerrit Renker if (unlikely(skb->len == 0)) 319da335bafSGerrit Renker return -EBADMSG; 3207c657876SArnaldo Carvalho de Melo 3217c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3227c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3231f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3248109b02bSArnaldo Carvalho de Melo (jiffies + 3258109b02bSArnaldo Carvalho de Melo usecs_to_jiffies(TFRC_INITIAL_TIMEOUT))); 3267c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3277c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 32890feeb95SGerrit Renker 32990feeb95SGerrit Renker /* Set t_0 for initial packet */ 3307c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 33130833ffeSGerrit Renker 33230833ffeSGerrit Renker hctx->ccid3hctx_s = skb->len; 33330833ffeSGerrit Renker 33430833ffeSGerrit Renker /* 33530833ffeSGerrit Renker * Use initial RTT sample when available: recommended by erratum 33630833ffeSGerrit Renker * to RFC 4342. This implements the initialisation procedure of 33730833ffeSGerrit Renker * draft rfc3448bis, section 4.2. Remember, X is scaled by 2^6. 33830833ffeSGerrit Renker */ 33930833ffeSGerrit Renker if (dp->dccps_syn_rtt) { 34030833ffeSGerrit Renker ccid3_pr_debug("SYN RTT = %uus\n", dp->dccps_syn_rtt); 34130833ffeSGerrit Renker hctx->ccid3hctx_rtt = dp->dccps_syn_rtt; 34230833ffeSGerrit Renker hctx->ccid3hctx_x = rfc3390_initial_rate(sk); 34323f062afSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 34430833ffeSGerrit Renker } else { 3456c08b2cfSGerrit Renker /* Sender does not have RTT sample: X_pps = 1 pkt/sec */ 3466c08b2cfSGerrit Renker hctx->ccid3hctx_x = hctx->ccid3hctx_s; 34730833ffeSGerrit Renker hctx->ccid3hctx_x <<= 6; 34830833ffeSGerrit Renker } 34930833ffeSGerrit Renker ccid3_update_send_interval(hctx); 35030833ffeSGerrit Renker 35130833ffeSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3527c657876SArnaldo Carvalho de Melo break; 3537c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3547c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 3558132da4dSGerrit Renker delay = ktime_us_delta(hctx->ccid3hctx_t_nom, now); 3568699be7dSIan McDonald ccid3_pr_debug("delay=%ld\n", (long)delay); 35791cf5a17SGerrit Renker /* 35891cf5a17SGerrit Renker * Scheduling of packet transmissions [RFC 3448, 4.6] 35991cf5a17SGerrit Renker * 36091cf5a17SGerrit Renker * if (t_now > t_nom - delta) 36191cf5a17SGerrit Renker * // send the packet now 36291cf5a17SGerrit Renker * else 36391cf5a17SGerrit Renker * // send the packet in (t_nom - t_now) milliseconds. 36491cf5a17SGerrit Renker */ 36549d66a70SGerrit Renker if (delay - (s64)hctx->ccid3hctx_delta >= 1000) 3668132da4dSGerrit Renker return (u32)delay / 1000L; 3679f8681dbSGerrit Renker 3688132da4dSGerrit Renker ccid3_hc_tx_update_win_count(hctx, now); 3697c657876SArnaldo Carvalho de Melo break; 37059348b19SGerrit Renker case TFRC_SSTATE_TERM: 371a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 3727da7f456SGerrit Renker return -EINVAL; 3737c657876SArnaldo Carvalho de Melo } 3747c657876SArnaldo Carvalho de Melo 3757da7f456SGerrit Renker /* prepare to send now (add options etc.) */ 376507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 377e312d100SGerrit Renker DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 378e312d100SGerrit Renker 379e312d100SGerrit Renker /* set the nominal send time for the next following packet */ 3808132da4dSGerrit Renker hctx->ccid3hctx_t_nom = ktime_add_us(hctx->ccid3hctx_t_nom, 3818132da4dSGerrit Renker hctx->ccid3hctx_t_ipi); 3827da7f456SGerrit Renker return 0; 3837c657876SArnaldo Carvalho de Melo } 3847c657876SArnaldo Carvalho de Melo 3858109b02bSArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, 3868109b02bSArnaldo Carvalho de Melo unsigned int len) 3877c657876SArnaldo Carvalho de Melo { 38859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3897c657876SArnaldo Carvalho de Melo 39078ad713dSGerrit Renker ccid3_hc_tx_update_s(hctx, len); 39178ad713dSGerrit Renker 392276f2edcSArnaldo Carvalho de Melo if (tfrc_tx_hist_add(&hctx->ccid3hctx_hist, dccp_sk(sk)->dccps_gss)) 393c5a1ae9aSGerrit Renker DCCP_CRIT("packet history - out of memory!"); 3947c657876SArnaldo Carvalho de Melo } 3957c657876SArnaldo Carvalho de Melo 3967c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 3977c657876SArnaldo Carvalho de Melo { 39859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3997c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4000740d49cSArnaldo Carvalho de Melo ktime_t now; 4012a1fda6fSGerrit Renker unsigned long t_nfb; 4027dfee1a9SGerrit Renker u32 pinv, r_sample; 4031f2333aeSArnaldo Carvalho de Melo 4047c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4057c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4067c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4077c657876SArnaldo Carvalho de Melo return; 4087c657876SArnaldo Carvalho de Melo 4097c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4107c657876SArnaldo Carvalho de Melo 4117c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4127c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4137c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4149108d5f4SArnaldo Carvalho de Melo now = ktime_get_real(); 4159108d5f4SArnaldo Carvalho de Melo 416276f2edcSArnaldo Carvalho de Melo /* estimate RTT from history if ACK number is valid */ 4179108d5f4SArnaldo Carvalho de Melo r_sample = tfrc_tx_hist_rtt(hctx->ccid3hctx_hist, 4189108d5f4SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq, now); 4199108d5f4SArnaldo Carvalho de Melo if (r_sample == 0) { 420276f2edcSArnaldo Carvalho de Melo DCCP_WARN("%s(%p): %s with bogus ACK-%llu\n", dccp_role(sk), sk, 421276f2edcSArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type), 422276f2edcSArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq); 4237c657876SArnaldo Carvalho de Melo return; 4247c657876SArnaldo Carvalho de Melo } 4257c657876SArnaldo Carvalho de Melo 4261a21e49aSGerrit Renker /* Update receive rate in units of 64 * bytes/second */ 4279e8efc82SGerrit Renker hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; 4289e8efc82SGerrit Renker hctx->ccid3hctx_x_recv <<= 6; 4295c3fbb6aSGerrit Renker 4305c3fbb6aSGerrit Renker /* Update loss event rate */ 4315c3fbb6aSGerrit Renker pinv = opt_recv->ccid3or_loss_event_rate; 43245393a66SGerrit Renker if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ 4335c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 0; 43445393a66SGerrit Renker else /* can not exceed 100% */ 4355c3fbb6aSGerrit Renker hctx->ccid3hctx_p = 1000000 / pinv; 4365c3fbb6aSGerrit Renker /* 4379108d5f4SArnaldo Carvalho de Melo * Validate new RTT sample and update moving average 4385c3fbb6aSGerrit Renker */ 4399108d5f4SArnaldo Carvalho de Melo r_sample = dccp_sample_rtt(sk, r_sample); 440c3ada46aSGerrit Renker hctx->ccid3hctx_rtt = tfrc_ewma(hctx->ccid3hctx_rtt, r_sample, 9); 4415c3fbb6aSGerrit Renker 4427c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 4431a21e49aSGerrit Renker /* 4441a21e49aSGerrit Renker * Larger Initial Windows [RFC 4342, sec. 5] 4451a21e49aSGerrit Renker */ 446a21f9f96SGerrit Renker hctx->ccid3hctx_x = rfc3390_initial_rate(sk); 4479823b7b5SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 448a79ef76fSGerrit Renker 4491266adeeSGerrit Renker ccid3_update_send_interval(hctx); 4505c3fbb6aSGerrit Renker 451a21f9f96SGerrit Renker ccid3_pr_debug("%s(%p), s=%u, MSS=%u, " 4527dfee1a9SGerrit Renker "R_sample=%uus, X=%u\n", dccp_role(sk), 4530f08461eSAndrew Morton sk, hctx->ccid3hctx_s, 4541b07a95aSDavid S. Miller dccp_sk(sk)->dccps_mss_cache, r_sample, 4551a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4565c3fbb6aSGerrit Renker 457a79ef76fSGerrit Renker ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 458a79ef76fSGerrit Renker } else { 4595c3fbb6aSGerrit Renker 460ff586298SGerrit Renker /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ 461ff586298SGerrit Renker if (hctx->ccid3hctx_p > 0) 462ff586298SGerrit Renker hctx->ccid3hctx_x_calc = 463ff586298SGerrit Renker tfrc_calc_x(hctx->ccid3hctx_s, 464ff586298SGerrit Renker hctx->ccid3hctx_rtt, 465ff586298SGerrit Renker hctx->ccid3hctx_p); 466aa97efd9SGerrit Renker ccid3_hc_tx_update_x(sk, &now); 4677c657876SArnaldo Carvalho de Melo 4687dfee1a9SGerrit Renker ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, " 4698109b02bSArnaldo Carvalho de Melo "p=%u, X_calc=%u, X_recv=%u, X=%u\n", 4708109b02bSArnaldo Carvalho de Melo dccp_role(sk), 4717dfee1a9SGerrit Renker sk, hctx->ccid3hctx_rtt, r_sample, 4725c3fbb6aSGerrit Renker hctx->ccid3hctx_s, hctx->ccid3hctx_p, 4735c3fbb6aSGerrit Renker hctx->ccid3hctx_x_calc, 4749e8efc82SGerrit Renker (unsigned)(hctx->ccid3hctx_x_recv >> 6), 4751a21e49aSGerrit Renker (unsigned)(hctx->ccid3hctx_x >> 6)); 4767c657876SArnaldo Carvalho de Melo } 4777c657876SArnaldo Carvalho de Melo 4787c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 4797c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 4807c657876SArnaldo Carvalho de Melo 481c530cfb1SArnaldo Carvalho de Melo /* 4828109b02bSArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible 4838109b02bSArnaldo Carvalho de Melo * that we now can send a packet, so wake up dccp_wait_for_ccid 484c530cfb1SArnaldo Carvalho de Melo */ 485c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 4868c60f3faSArnaldo Carvalho de Melo 4878a508ac2SGerrit Renker /* 4888a508ac2SGerrit Renker * Update timeout interval for the nofeedback timer. 4898a508ac2SGerrit Renker * We use a configuration option to increase the lower bound. 4908109b02bSArnaldo Carvalho de Melo * This can help avoid triggering the nofeedback timer too 4918109b02bSArnaldo Carvalho de Melo * often ('spinning') on LANs with small RTTs. 4928a508ac2SGerrit Renker */ 4935d0dbc4aSGerrit Renker hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 4948a508ac2SGerrit Renker CONFIG_IP_DCCP_CCID3_RTO * 4958a508ac2SGerrit Renker (USEC_PER_SEC/1000)); 4961f2333aeSArnaldo Carvalho de Melo /* 4971f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 4988a508ac2SGerrit Renker * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) 4991f2333aeSArnaldo Carvalho de Melo */ 5008a508ac2SGerrit Renker t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); 5017c657876SArnaldo Carvalho de Melo 502a9672411SGerrit Renker ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " 5038109b02bSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5048109b02bSArnaldo Carvalho de Melo dccp_role(sk), 505a9672411SGerrit Renker sk, usecs_to_jiffies(t_nfb), t_nfb); 5067c657876SArnaldo Carvalho de Melo 5077c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5082a1fda6fSGerrit Renker jiffies + usecs_to_jiffies(t_nfb)); 5097c657876SArnaldo Carvalho de Melo break; 510151a9931SGerrit Renker case TFRC_SSTATE_NO_SENT: /* fall through */ 5115e19e3fcSGerrit Renker case TFRC_SSTATE_TERM: /* ignore feedback when closing */ 5127c657876SArnaldo Carvalho de Melo break; 5137c657876SArnaldo Carvalho de Melo } 5147c657876SArnaldo Carvalho de Melo } 5157c657876SArnaldo Carvalho de Melo 5167c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 5171f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 5181f2333aeSArnaldo Carvalho de Melo unsigned char *value) 5197c657876SArnaldo Carvalho de Melo { 5207c657876SArnaldo Carvalho de Melo int rc = 0; 52159725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 52259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5237c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 52476fd1e87SGerrit Renker __be32 opt_val; 5257c657876SArnaldo Carvalho de Melo 5267c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 5277c657876SArnaldo Carvalho de Melo 5287c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 5297c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 5307c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 5317c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 5327c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 5337c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 5347c657876SArnaldo Carvalho de Melo } 5357c657876SArnaldo Carvalho de Melo 5367c657876SArnaldo Carvalho de Melo switch (option) { 5377c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 53859d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 539a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 54059348b19SGerrit Renker "for TFRC_OPT_LOSS_EVENT_RATE\n", 54159348b19SGerrit Renker dccp_role(sk), sk, len); 5427c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5437c657876SArnaldo Carvalho de Melo } else { 54476fd1e87SGerrit Renker opt_val = get_unaligned((__be32 *)value); 54576fd1e87SGerrit Renker opt_recv->ccid3or_loss_event_rate = ntohl(opt_val); 546a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", 5477c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5487c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 5497c657876SArnaldo Carvalho de Melo } 5507c657876SArnaldo Carvalho de Melo break; 5517c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 5527c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 5537c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 554a9672411SGerrit Renker ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n", 5557c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5567c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 5577c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 5587c657876SArnaldo Carvalho de Melo break; 5597c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 56059d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 561a9672411SGerrit Renker DCCP_WARN("%s(%p), invalid len %d " 56259348b19SGerrit Renker "for TFRC_OPT_RECEIVE_RATE\n", 56359348b19SGerrit Renker dccp_role(sk), sk, len); 5647c657876SArnaldo Carvalho de Melo rc = -EINVAL; 5657c657876SArnaldo Carvalho de Melo } else { 56676fd1e87SGerrit Renker opt_val = get_unaligned((__be32 *)value); 56776fd1e87SGerrit Renker opt_recv->ccid3or_receive_rate = ntohl(opt_val); 568a9672411SGerrit Renker ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", 5697c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 5707c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 5717c657876SArnaldo Carvalho de Melo } 5727c657876SArnaldo Carvalho de Melo break; 5737c657876SArnaldo Carvalho de Melo } 5747c657876SArnaldo Carvalho de Melo 5757c657876SArnaldo Carvalho de Melo return rc; 5767c657876SArnaldo Carvalho de Melo } 5777c657876SArnaldo Carvalho de Melo 57891f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) 5797c657876SArnaldo Carvalho de Melo { 58091f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); 5817c657876SArnaldo Carvalho de Melo 5827c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 583276f2edcSArnaldo Carvalho de Melo hctx->ccid3hctx_hist = NULL; 584b24b8a24SPavel Emelyanov setup_timer(&hctx->ccid3hctx_no_feedback_timer, 585b24b8a24SPavel Emelyanov ccid3_hc_tx_no_feedback_timer, (unsigned long)sk); 5867c657876SArnaldo Carvalho de Melo 5877c657876SArnaldo Carvalho de Melo return 0; 5887c657876SArnaldo Carvalho de Melo } 5897c657876SArnaldo Carvalho de Melo 5907c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 5917c657876SArnaldo Carvalho de Melo { 59259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5937c657876SArnaldo Carvalho de Melo 5947c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 5957c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5967c657876SArnaldo Carvalho de Melo 597276f2edcSArnaldo Carvalho de Melo tfrc_tx_hist_purge(&hctx->ccid3hctx_hist); 5987c657876SArnaldo Carvalho de Melo } 5997c657876SArnaldo Carvalho de Melo 6009bf17475SGerrit Renker static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 6019bf17475SGerrit Renker { 6022e86908fSGerrit Renker struct ccid3_hc_tx_sock *hctx; 6037c657876SArnaldo Carvalho de Melo 6049bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6059bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6069bf17475SGerrit Renker return; 6079bf17475SGerrit Renker 6082e86908fSGerrit Renker hctx = ccid3_hc_tx_sk(sk); 6099bf17475SGerrit Renker info->tcpi_rto = hctx->ccid3hctx_t_rto; 6109bf17475SGerrit Renker info->tcpi_rtt = hctx->ccid3hctx_rtt; 6119bf17475SGerrit Renker } 6129bf17475SGerrit Renker 6139bf17475SGerrit Renker static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, 6149bf17475SGerrit Renker u32 __user *optval, int __user *optlen) 6159bf17475SGerrit Renker { 6162e86908fSGerrit Renker const struct ccid3_hc_tx_sock *hctx; 6179bf17475SGerrit Renker const void *val; 6189bf17475SGerrit Renker 6199bf17475SGerrit Renker /* Listen socks doesn't have a private CCID block */ 6209bf17475SGerrit Renker if (sk->sk_state == DCCP_LISTEN) 6219bf17475SGerrit Renker return -EINVAL; 6229bf17475SGerrit Renker 6232e86908fSGerrit Renker hctx = ccid3_hc_tx_sk(sk); 6249bf17475SGerrit Renker switch (optname) { 6259bf17475SGerrit Renker case DCCP_SOCKOPT_CCID_TX_INFO: 6269bf17475SGerrit Renker if (len < sizeof(hctx->ccid3hctx_tfrc)) 6279bf17475SGerrit Renker return -EINVAL; 6289bf17475SGerrit Renker len = sizeof(hctx->ccid3hctx_tfrc); 6299bf17475SGerrit Renker val = &hctx->ccid3hctx_tfrc; 6309bf17475SGerrit Renker break; 6319bf17475SGerrit Renker default: 6329bf17475SGerrit Renker return -ENOPROTOOPT; 6339bf17475SGerrit Renker } 6349bf17475SGerrit Renker 6359bf17475SGerrit Renker if (put_user(len, optlen) || copy_to_user(optval, val, len)) 6369bf17475SGerrit Renker return -EFAULT; 6379bf17475SGerrit Renker 6389bf17475SGerrit Renker return 0; 6399bf17475SGerrit Renker } 6409bf17475SGerrit Renker 6419bf17475SGerrit Renker /* 6429bf17475SGerrit Renker * Receiver Half-Connection Routines 6439bf17475SGerrit Renker */ 64456724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 6457c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 6467c657876SArnaldo Carvalho de Melo { 6477c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 6487c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 6497c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 6507c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 6517c657876SArnaldo Carvalho de Melo }; 6527c657876SArnaldo Carvalho de Melo 6537c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 6547c657876SArnaldo Carvalho de Melo } 6557c657876SArnaldo Carvalho de Melo #endif 6567c657876SArnaldo Carvalho de Melo 657c25a18baSArnaldo Carvalho de Melo static void ccid3_hc_rx_set_state(struct sock *sk, 6581f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 6597c657876SArnaldo Carvalho de Melo { 66059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6617c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 6627c657876SArnaldo Carvalho de Melo 6637c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 6641f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 6651f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 6667c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 6677c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 6687c657876SArnaldo Carvalho de Melo } 6697c657876SArnaldo Carvalho de Melo 67078ad713dSGerrit Renker static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) 67178ad713dSGerrit Renker { 672c3ada46aSGerrit Renker if (likely(len > 0)) /* don't update on empty packets (e.g. ACKs) */ 673c3ada46aSGerrit Renker hcrx->ccid3hcrx_s = tfrc_ewma(hcrx->ccid3hcrx_s, len, 9); 67478ad713dSGerrit Renker } 67578ad713dSGerrit Renker 6767c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 6777c657876SArnaldo Carvalho de Melo { 67859725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 6797c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 680d58d1af0SArnaldo Carvalho de Melo struct tfrc_rx_hist_entry *packet; 681e7c23357SArnaldo Carvalho de Melo ktime_t now; 6820f9e5b57SGerrit Renker suseconds_t delta; 6837c657876SArnaldo Carvalho de Melo 684a9672411SGerrit Renker ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk), sk); 6857c657876SArnaldo Carvalho de Melo 686e7a81c6dSArnaldo Carvalho de Melo now = ktime_get_real(); 687b6ee3d4aSArnaldo Carvalho de Melo 6887c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 6897c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 6907c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 6917c657876SArnaldo Carvalho de Melo break; 6920f9e5b57SGerrit Renker case TFRC_RSTATE_DATA: 693e7a81c6dSArnaldo Carvalho de Melo delta = ktime_us_delta(now, 694e7a81c6dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback); 6950f9e5b57SGerrit Renker DCCP_BUG_ON(delta < 0); 696b9039a2aSGerrit Renker hcrx->ccid3hcrx_x_recv = 697b9039a2aSGerrit Renker scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); 6987c657876SArnaldo Carvalho de Melo break; 69959348b19SGerrit Renker case TFRC_RSTATE_TERM: 700a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 7017c657876SArnaldo Carvalho de Melo return; 7027c657876SArnaldo Carvalho de Melo } 7037c657876SArnaldo Carvalho de Melo 704d58d1af0SArnaldo Carvalho de Melo packet = tfrc_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 70559d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 706a9672411SGerrit Renker DCCP_WARN("%s(%p), no data packet in history!\n", 70759348b19SGerrit Renker dccp_role(sk), sk); 7087c657876SArnaldo Carvalho de Melo return; 7097c657876SArnaldo Carvalho de Melo } 7107c657876SArnaldo Carvalho de Melo 711b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 712d58d1af0SArnaldo Carvalho de Melo hcrx->ccid3hcrx_ccval_last_counter = packet->tfrchrx_ccval; 7137c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7147c657876SArnaldo Carvalho de Melo 7157c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 71645393a66SGerrit Renker hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ 71745393a66SGerrit Renker else if (hcrx->ccid3hcrx_p > 1000000) { 71845393a66SGerrit Renker DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); 71945393a66SGerrit Renker hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ 72045393a66SGerrit Renker } else 7217c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 72245393a66SGerrit Renker 723507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7247c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7257c657876SArnaldo Carvalho de Melo } 7267c657876SArnaldo Carvalho de Melo 7272d0817d1SArnaldo Carvalho de Melo static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7287c657876SArnaldo Carvalho de Melo { 7292e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 73060fe62e7SAndrea Bittau __be32 x_recv, pinv; 7317c657876SArnaldo Carvalho de Melo 73259d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 7332d0817d1SArnaldo Carvalho de Melo return 0; 7347c657876SArnaldo Carvalho de Melo 7352e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 73666a377c5SIan McDonald DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; 7374fded33bSArnaldo Carvalho de Melo 7384fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 7392d0817d1SArnaldo Carvalho de Melo return 0; 7404fded33bSArnaldo Carvalho de Melo 7414fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 7424fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 7432d0817d1SArnaldo Carvalho de Melo 744eb279b79SGerrit Renker if (dccp_insert_option_timestamp(sk, skb) || 7454fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 7462d0817d1SArnaldo Carvalho de Melo &pinv, sizeof(pinv)) || 7474fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 7482d0817d1SArnaldo Carvalho de Melo &x_recv, sizeof(x_recv))) 7492d0817d1SArnaldo Carvalho de Melo return -1; 7502d0817d1SArnaldo Carvalho de Melo 7512d0817d1SArnaldo Carvalho de Melo return 0; 7527c657876SArnaldo Carvalho de Melo } 7537c657876SArnaldo Carvalho de Melo 75466a377c5SIan McDonald static int ccid3_hc_rx_detect_loss(struct sock *sk, 755d58d1af0SArnaldo Carvalho de Melo struct tfrc_rx_hist_entry *packet) 7567c657876SArnaldo Carvalho de Melo { 75759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 758d58d1af0SArnaldo Carvalho de Melo struct tfrc_rx_hist_entry *rx_hist = 759d58d1af0SArnaldo Carvalho de Melo tfrc_rx_hist_head(&hcrx->ccid3hcrx_hist); 760d58d1af0SArnaldo Carvalho de Melo u64 seqno = packet->tfrchrx_seqno; 76166a377c5SIan McDonald u64 tmp_seqno; 76266a377c5SIan McDonald int loss = 0; 76366a377c5SIan McDonald u8 ccval; 7647c657876SArnaldo Carvalho de Melo 76566a377c5SIan McDonald 76666a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 76766a377c5SIan McDonald 76866a377c5SIan McDonald if (!rx_hist || 769d58d1af0SArnaldo Carvalho de Melo follows48(packet->tfrchrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 77066a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 771d58d1af0SArnaldo Carvalho de Melo hcrx->ccid3hcrx_ccval_nonloss = packet->tfrchrx_ccval; 77266a377c5SIan McDonald goto detect_out; 77366a377c5SIan McDonald } 77466a377c5SIan McDonald 77566a377c5SIan McDonald 77666a377c5SIan McDonald while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) 77766a377c5SIan McDonald > TFRC_RECV_NUM_LATE_LOSS) { 77866a377c5SIan McDonald loss = 1; 779cc4d6a3aSArnaldo Carvalho de Melo dccp_li_update_li(sk, 780d83258a3SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, 781d83258a3SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_hist, 782e7c23357SArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback, 783d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s, 784d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv, 785d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv, 786d83258a3SArnaldo Carvalho de Melo hcrx->ccid3hcrx_seqno_nonloss, 78766a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss); 78866a377c5SIan McDonald tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; 78966a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 79066a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 79166a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 792d58d1af0SArnaldo Carvalho de Melo while (tfrc_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, 79366a377c5SIan McDonald tmp_seqno, &ccval)) { 79466a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; 79566a377c5SIan McDonald hcrx->ccid3hcrx_ccval_nonloss = ccval; 79666a377c5SIan McDonald dccp_inc_seqno(&tmp_seqno); 79766a377c5SIan McDonald } 79866a377c5SIan McDonald } 79966a377c5SIan McDonald 80066a377c5SIan McDonald /* FIXME - this code could be simplified with above while */ 80166a377c5SIan McDonald /* but works at moment */ 802d58d1af0SArnaldo Carvalho de Melo if (follows48(packet->tfrchrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { 80366a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss = seqno; 804d58d1af0SArnaldo Carvalho de Melo hcrx->ccid3hcrx_ccval_nonloss = packet->tfrchrx_ccval; 80566a377c5SIan McDonald } 80666a377c5SIan McDonald 80766a377c5SIan McDonald detect_out: 808d58d1af0SArnaldo Carvalho de Melo tfrc_rx_hist_add_packet(&hcrx->ccid3hcrx_hist, 80966a377c5SIan McDonald &hcrx->ccid3hcrx_li_hist, packet, 81066a377c5SIan McDonald hcrx->ccid3hcrx_seqno_nonloss); 81166a377c5SIan McDonald return loss; 8127c657876SArnaldo Carvalho de Melo } 8137c657876SArnaldo Carvalho de Melo 8147c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 8157c657876SArnaldo Carvalho de Melo { 81659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 8174fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 818d58d1af0SArnaldo Carvalho de Melo struct tfrc_rx_hist_entry *packet; 8197dfee1a9SGerrit Renker u32 p_prev, r_sample, rtt_prev; 82078ad713dSGerrit Renker int loss, payload_size; 8219823b7b5SArnaldo Carvalho de Melo ktime_t now; 8221f2333aeSArnaldo Carvalho de Melo 82359725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 8244fded33bSArnaldo Carvalho de Melo 8257c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 8267c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 8277c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 8287c657876SArnaldo Carvalho de Melo return; 8299823b7b5SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 8304fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 8317c657876SArnaldo Carvalho de Melo break; 8323393da82SGerrit Renker r_sample = dccp_timestamp() - opt_recv->dccpor_timestamp_echo; 83366a377c5SIan McDonald rtt_prev = hcrx->ccid3hcrx_rtt; 8343393da82SGerrit Renker r_sample = dccp_sample_rtt(sk, 10 * r_sample); 835b3a3077dSArnaldo Carvalho de Melo 836b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 837b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 838b3a3077dSArnaldo Carvalho de Melo else 839b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 840b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 841b3a3077dSArnaldo Carvalho de Melo 84266a377c5SIan McDonald if (rtt_prev != hcrx->ccid3hcrx_rtt) 843a9672411SGerrit Renker ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n", 844a9672411SGerrit Renker dccp_role(sk), sk, hcrx->ccid3hcrx_rtt, 8454fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 8467c657876SArnaldo Carvalho de Melo break; 8477c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 8487c657876SArnaldo Carvalho de Melo break; 84959d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 8507c657876SArnaldo Carvalho de Melo return; 8517c657876SArnaldo Carvalho de Melo } 8527c657876SArnaldo Carvalho de Melo 853d58d1af0SArnaldo Carvalho de Melo packet = tfrc_rx_hist_entry_new(opt_recv->dccpor_ndp, skb, GFP_ATOMIC); 85459d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 855a9672411SGerrit Renker DCCP_WARN("%s(%p), Not enough mem to add rx packet " 85659348b19SGerrit Renker "to history, consider it lost!\n", dccp_role(sk), sk); 8577c657876SArnaldo Carvalho de Melo return; 8587c657876SArnaldo Carvalho de Melo } 8597c657876SArnaldo Carvalho de Melo 86066a377c5SIan McDonald loss = ccid3_hc_rx_detect_loss(sk, packet); 8617c657876SArnaldo Carvalho de Melo 8627c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 8637c657876SArnaldo Carvalho de Melo return; 8647c657876SArnaldo Carvalho de Melo 86578ad713dSGerrit Renker payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; 86678ad713dSGerrit Renker ccid3_hc_rx_update_s(hcrx, payload_size); 86778ad713dSGerrit Renker 8687c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 8697c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 870a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial " 871a9672411SGerrit Renker "feedback\n", dccp_role(sk), sk, 8721f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 8737c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 8747c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 8757c657876SArnaldo Carvalho de Melo return; 8769823b7b5SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 87778ad713dSGerrit Renker hcrx->ccid3hcrx_bytes_recv += payload_size; 87866a377c5SIan McDonald if (loss) 879b6ee3d4aSArnaldo Carvalho de Melo break; 880b6ee3d4aSArnaldo Carvalho de Melo 8811faf0a1fSArnaldo Carvalho de Melo now = ktime_get_real(); 8821faf0a1fSArnaldo Carvalho de Melo if ((ktime_us_delta(now, hcrx->ccid3hcrx_tstamp_last_ack) - 8831faf0a1fSArnaldo Carvalho de Melo (s64)hcrx->ccid3hcrx_rtt) >= 0) { 884b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 8857c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 8867c657876SArnaldo Carvalho de Melo } 8877c657876SArnaldo Carvalho de Melo return; 88859348b19SGerrit Renker case TFRC_RSTATE_TERM: 889a9672411SGerrit Renker DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); 8907c657876SArnaldo Carvalho de Melo return; 8917c657876SArnaldo Carvalho de Melo } 8927c657876SArnaldo Carvalho de Melo 8937c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 894a9672411SGerrit Renker ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n", 8954fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 8967c657876SArnaldo Carvalho de Melo 8977c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 8987c657876SArnaldo Carvalho de Melo 8997c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 900c0996660SIan McDonald if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { 901c0996660SIan McDonald u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 902c0996660SIan McDonald 9037c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 904c0996660SIan McDonald if (i_mean != 0) 905c0996660SIan McDonald hcrx->ccid3hcrx_p = 1000000 / i_mean; 90659348b19SGerrit Renker } else 90759348b19SGerrit Renker DCCP_BUG("empty loss history"); 9087c657876SArnaldo Carvalho de Melo 9097c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 9107c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 9117c657876SArnaldo Carvalho de Melo return; 9127c657876SArnaldo Carvalho de Melo } 9137c657876SArnaldo Carvalho de Melo } 9147c657876SArnaldo Carvalho de Melo 91591f0ebf7SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) 9167c657876SArnaldo Carvalho de Melo { 91791f0ebf7SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); 9187c657876SArnaldo Carvalho de Melo 919a9672411SGerrit Renker ccid3_pr_debug("entry\n"); 9207c657876SArnaldo Carvalho de Melo 9217c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 9227c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 923ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 9241faf0a1fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = 925e7a81c6dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = ktime_get_real(); 9267c657876SArnaldo Carvalho de Melo return 0; 9277c657876SArnaldo Carvalho de Melo } 9287c657876SArnaldo Carvalho de Melo 9297c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 9307c657876SArnaldo Carvalho de Melo { 93159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9327c657876SArnaldo Carvalho de Melo 9337c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 9347c657876SArnaldo Carvalho de Melo 9357c657876SArnaldo Carvalho de Melo /* Empty packet history */ 936d58d1af0SArnaldo Carvalho de Melo tfrc_rx_hist_purge(&hcrx->ccid3hcrx_hist); 9377c657876SArnaldo Carvalho de Melo 9387c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 939cc4d6a3aSArnaldo Carvalho de Melo dccp_li_hist_purge(&hcrx->ccid3hcrx_li_hist); 9407c657876SArnaldo Carvalho de Melo } 9417c657876SArnaldo Carvalho de Melo 9422babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 9432babe1f6SArnaldo Carvalho de Melo { 9442e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 9452babe1f6SArnaldo Carvalho de Melo 94659c2353dSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 94759c2353dSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 94859c2353dSArnaldo Carvalho de Melo return; 94959c2353dSArnaldo Carvalho de Melo 9502e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 9512babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 9522babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 9532babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 9542babe1f6SArnaldo Carvalho de Melo } 9552babe1f6SArnaldo Carvalho de Melo 95688f964dbSArnaldo Carvalho de Melo static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, 95788f964dbSArnaldo Carvalho de Melo u32 __user *optval, int __user *optlen) 95888f964dbSArnaldo Carvalho de Melo { 9592e86908fSGerrit Renker const struct ccid3_hc_rx_sock *hcrx; 96088f964dbSArnaldo Carvalho de Melo const void *val; 96188f964dbSArnaldo Carvalho de Melo 96288f964dbSArnaldo Carvalho de Melo /* Listen socks doesn't have a private CCID block */ 96388f964dbSArnaldo Carvalho de Melo if (sk->sk_state == DCCP_LISTEN) 96488f964dbSArnaldo Carvalho de Melo return -EINVAL; 96588f964dbSArnaldo Carvalho de Melo 9662e86908fSGerrit Renker hcrx = ccid3_hc_rx_sk(sk); 96788f964dbSArnaldo Carvalho de Melo switch (optname) { 96888f964dbSArnaldo Carvalho de Melo case DCCP_SOCKOPT_CCID_RX_INFO: 96988f964dbSArnaldo Carvalho de Melo if (len < sizeof(hcrx->ccid3hcrx_tfrc)) 97088f964dbSArnaldo Carvalho de Melo return -EINVAL; 97188f964dbSArnaldo Carvalho de Melo len = sizeof(hcrx->ccid3hcrx_tfrc); 97288f964dbSArnaldo Carvalho de Melo val = &hcrx->ccid3hcrx_tfrc; 97388f964dbSArnaldo Carvalho de Melo break; 97488f964dbSArnaldo Carvalho de Melo default: 97588f964dbSArnaldo Carvalho de Melo return -ENOPROTOOPT; 97688f964dbSArnaldo Carvalho de Melo } 97788f964dbSArnaldo Carvalho de Melo 97888f964dbSArnaldo Carvalho de Melo if (put_user(len, optlen) || copy_to_user(optval, val, len)) 97988f964dbSArnaldo Carvalho de Melo return -EFAULT; 98088f964dbSArnaldo Carvalho de Melo 98188f964dbSArnaldo Carvalho de Melo return 0; 98288f964dbSArnaldo Carvalho de Melo } 98388f964dbSArnaldo Carvalho de Melo 98491f0ebf7SArnaldo Carvalho de Melo static struct ccid_operations ccid3 = { 9853dd9a7c3SIan McDonald .ccid_id = DCCPC_CCID3, 9867c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 9877c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 98891f0ebf7SArnaldo Carvalho de Melo .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), 9897c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 9907c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 9917c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 9927c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 9937c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 9947c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 99591f0ebf7SArnaldo Carvalho de Melo .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), 9967c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 9977c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 9987c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 9997c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 10002babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 10012babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 100288f964dbSArnaldo Carvalho de Melo .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, 100388f964dbSArnaldo Carvalho de Melo .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, 10047c657876SArnaldo Carvalho de Melo }; 10057c657876SArnaldo Carvalho de Melo 100656724aa4SGerrit Renker #ifdef CONFIG_IP_DCCP_CCID3_DEBUG 1007042d18f9SGerrit Renker module_param(ccid3_debug, bool, 0444); 10087c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 100956724aa4SGerrit Renker #endif 10107c657876SArnaldo Carvalho de Melo 10117c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 10127c657876SArnaldo Carvalho de Melo { 101334a9e7eaSArnaldo Carvalho de Melo return ccid_register(&ccid3); 10147c657876SArnaldo Carvalho de Melo } 10157c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 10167c657876SArnaldo Carvalho de Melo 10177c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 10187c657876SArnaldo Carvalho de Melo { 10197c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 10207c657876SArnaldo Carvalho de Melo } 10217c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 10227c657876SArnaldo Carvalho de Melo 1023e6bccd35SIan McDonald MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " 10241f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 10257c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 10267c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 10277c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1028