Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/dccp/ccids/ccid3.c |
| 3 | * |
| 4 | * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand. |
Ian McDonald | e6bccd3 | 2006-08-26 19:01:30 -0700 | [diff] [blame] | 5 | * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz> |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 6 | * |
| 7 | * An implementation of the DCCP protocol |
| 8 | * |
| 9 | * This code has been developed by the University of Waikato WAND |
| 10 | * research group. For further information please see http://www.wand.net.nz/ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 11 | * |
| 12 | * This code also uses code from Lulea University, rereleased as GPL by its |
| 13 | * authors: |
| 14 | * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon |
| 15 | * |
| 16 | * Changes to meet Linux coding standards, to make it meet latest ccid3 draft |
| 17 | * and to make it work as a loadable module in the DCCP stack written by |
| 18 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br>. |
| 19 | * |
| 20 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
| 21 | * |
| 22 | * This program is free software; you can redistribute it and/or modify |
| 23 | * it under the terms of the GNU General Public License as published by |
| 24 | * the Free Software Foundation; either version 2 of the License, or |
| 25 | * (at your option) any later version. |
| 26 | * |
| 27 | * This program is distributed in the hope that it will be useful, |
| 28 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 29 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 30 | * GNU General Public License for more details. |
| 31 | * |
| 32 | * You should have received a copy of the GNU General Public License |
| 33 | * along with this program; if not, write to the Free Software |
| 34 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 35 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 36 | #include "../ccid.h" |
| 37 | #include "../dccp.h" |
Arnaldo Carvalho de Melo | 4524b25 | 2005-08-27 23:18:26 -0300 | [diff] [blame] | 38 | #include "lib/packet_history.h" |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 39 | #include "lib/loss_interval.h" |
Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 40 | #include "lib/tfrc.h" |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 41 | #include "ccid3.h" |
| 42 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 43 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
| 44 | static int ccid3_debug; |
| 45 | #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 46 | #else |
| 47 | #define ccid3_pr_debug(format, a...) |
| 48 | #endif |
| 49 | |
Arnaldo Carvalho de Melo | a1d3a35 | 2005-08-13 22:42:25 -0300 | [diff] [blame] | 50 | static struct dccp_tx_hist *ccid3_tx_hist; |
| 51 | static struct dccp_rx_hist *ccid3_rx_hist; |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 52 | static struct dccp_li_hist *ccid3_li_hist; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 53 | |
Gerrit Renker | 9bf1747 | 2007-03-20 13:11:24 -0300 | [diff] [blame^] | 54 | /* |
| 55 | * Transmitter Half-Connection Routines |
| 56 | */ |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 57 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 58 | static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) |
| 59 | { |
| 60 | static char *ccid3_state_names[] = { |
| 61 | [TFRC_SSTATE_NO_SENT] = "NO_SENT", |
| 62 | [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", |
| 63 | [TFRC_SSTATE_FBACK] = "FBACK", |
| 64 | [TFRC_SSTATE_TERM] = "TERM", |
| 65 | }; |
| 66 | |
| 67 | return ccid3_state_names[state]; |
| 68 | } |
| 69 | #endif |
| 70 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 71 | static void ccid3_hc_tx_set_state(struct sock *sk, |
| 72 | enum ccid3_hc_tx_states state) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 73 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 74 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 75 | enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; |
| 76 | |
| 77 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 78 | dccp_role(sk), sk, ccid3_tx_state_name(oldstate), |
| 79 | ccid3_tx_state_name(state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 80 | WARN_ON(state == oldstate); |
| 81 | hctx->ccid3hctx_state = state; |
| 82 | } |
| 83 | |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 84 | /* |
| 85 | * Recalculate scheduled nominal send time t_nom, inter-packet interval |
| 86 | * t_ipi, and delta value. Should be called after each change to X. |
| 87 | */ |
| 88 | static inline void ccid3_update_send_time(struct ccid3_hc_tx_sock *hctx) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 89 | { |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 90 | timeval_sub_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 91 | |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 92 | /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */ |
| 93 | hctx->ccid3hctx_t_ipi = scaled_div(hctx->ccid3hctx_s, |
| 94 | hctx->ccid3hctx_x >> 6); |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 95 | |
| 96 | /* Update nominal send time with regard to the new t_ipi */ |
| 97 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
| 98 | |
| 99 | /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 100 | hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, |
| 101 | TFRC_OPSYS_HALF_TIME_GRAN); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 102 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 103 | /* |
| 104 | * Update X by |
| 105 | * If (p > 0) |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 106 | * X_calc = calcX(s, R, p); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 107 | * X = max(min(X_calc, 2 * X_recv), s / t_mbi); |
| 108 | * Else |
| 109 | * If (now - tld >= R) |
| 110 | * X = max(min(2 * X, 2 * X_recv), s / R); |
| 111 | * tld = now; |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 112 | * |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 113 | * Note: X and X_recv are both stored in units of 64 * bytes/second, to support |
| 114 | * fine-grained resolution of sending rates. This requires scaling by 2^6 |
| 115 | * throughout the code. Only X_calc is unscaled (in bytes/second). |
| 116 | * |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 117 | * If X has changed, we also update the scheduled send time t_now, |
| 118 | * the inter-packet interval t_ipi, and the delta value. |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 119 | */ |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 120 | static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now) |
| 121 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 122 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 123 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 124 | const __u64 old_x = hctx->ccid3hctx_x; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 125 | |
Gerrit Renker | 4415830 | 2006-12-03 14:53:07 -0200 | [diff] [blame] | 126 | if (hctx->ccid3hctx_p > 0) { |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 127 | |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 128 | hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 129 | hctx->ccid3hctx_x_recv * 2); |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 130 | hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, |
| 131 | (((__u64)hctx->ccid3hctx_s) << 6) / |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 132 | TFRC_T_MBI); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 133 | |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 134 | } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) - |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 135 | (suseconds_t)hctx->ccid3hctx_rtt >= 0) { |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 136 | |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 137 | hctx->ccid3hctx_x = |
| 138 | max(2 * min(hctx->ccid3hctx_x, hctx->ccid3hctx_x_recv), |
| 139 | scaled_div(((__u64)hctx->ccid3hctx_s) << 6, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 140 | hctx->ccid3hctx_rtt)); |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 141 | hctx->ccid3hctx_t_ld = *now; |
Gerrit Renker | ff58629 | 2006-12-10 00:00:14 -0200 | [diff] [blame] | 142 | } |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 143 | |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 144 | if (hctx->ccid3hctx_x != old_x) |
| 145 | ccid3_update_send_time(hctx); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 146 | } |
| 147 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 148 | /* |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 149 | * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) |
| 150 | * @len: DCCP packet payload size in bytes |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 151 | */ |
| 152 | static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) |
| 153 | { |
Gerrit Renker | 353b13e | 2007-03-20 13:10:15 -0300 | [diff] [blame] | 154 | hctx->ccid3hctx_s = hctx->ccid3hctx_s == 0 ? len : |
| 155 | (9 * hctx->ccid3hctx_s + len) / 10; |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 156 | /* |
| 157 | * Note: We could do a potential optimisation here - when `s' changes, |
| 158 | * recalculate sending rate and consequently t_ipi, t_delta, and |
| 159 | * t_now. This is however non-standard, and the benefits are not |
| 160 | * clear, so it is currently left out. |
| 161 | */ |
| 162 | } |
| 163 | |
Gerrit Renker | 9f8681d | 2006-12-10 00:07:37 -0200 | [diff] [blame] | 164 | /* |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 165 | * Update Window Counter using the algorithm from [RFC 4342, 8.1]. |
| 166 | * The algorithm is not applicable if RTT < 4 microseconds. |
Gerrit Renker | 9f8681d | 2006-12-10 00:07:37 -0200 | [diff] [blame] | 167 | */ |
| 168 | static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, |
| 169 | struct timeval *now) |
| 170 | { |
| 171 | suseconds_t delta; |
| 172 | u32 quarter_rtts; |
| 173 | |
| 174 | if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ |
| 175 | return; |
| 176 | |
| 177 | delta = timeval_delta(now, &hctx->ccid3hctx_t_last_win_count); |
| 178 | DCCP_BUG_ON(delta < 0); |
| 179 | |
| 180 | quarter_rtts = (u32)delta / (hctx->ccid3hctx_rtt / 4); |
| 181 | |
| 182 | if (quarter_rtts > 0) { |
| 183 | hctx->ccid3hctx_t_last_win_count = *now; |
| 184 | hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); |
| 185 | hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ |
| 186 | |
| 187 | ccid3_pr_debug("now at %#X\n", hctx->ccid3hctx_last_win_count); |
| 188 | } |
| 189 | } |
| 190 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 191 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) |
| 192 | { |
| 193 | struct sock *sk = (struct sock *)data; |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 194 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 195 | unsigned long t_nfb = USEC_PER_SEC / 5; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 196 | |
| 197 | bh_lock_sock(sk); |
| 198 | if (sock_owned_by_user(sk)) { |
| 199 | /* Try again later. */ |
| 200 | /* XXX: set some sensible MIB */ |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 201 | goto restart_timer; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 202 | } |
| 203 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 204 | ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 205 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 206 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 207 | switch (hctx->ccid3hctx_state) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 208 | case TFRC_SSTATE_NO_FBACK: |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 209 | /* RFC 3448, 4.4: Halve send rate directly */ |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 210 | hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2, |
| 211 | (((__u64)hctx->ccid3hctx_s) << 6) / |
| 212 | TFRC_T_MBI); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 213 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 214 | ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u " |
| 215 | "bytes/s\n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 216 | ccid3_tx_state_name(hctx->ccid3hctx_state), |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 217 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 218 | /* The value of R is still undefined and so we can not recompute |
| 219 | * the timout value. Keep initial value as per [RFC 4342, 5]. */ |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 220 | t_nfb = TFRC_INITIAL_TIMEOUT; |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 221 | ccid3_update_send_time(hctx); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 222 | break; |
| 223 | case TFRC_SSTATE_FBACK: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 224 | /* |
| 225 | * Check if IDLE since last timeout and recv rate is less than |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 226 | * 4 packets (in units of 64*bytes/sec) per RTT |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 227 | */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 228 | if (!hctx->ccid3hctx_idle || |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 229 | (hctx->ccid3hctx_x_recv >= 4 * |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 230 | scaled_div(((__u64)hctx->ccid3hctx_s) << 6, |
| 231 | hctx->ccid3hctx_rtt))) { |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 232 | struct timeval now; |
| 233 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 234 | ccid3_pr_debug("%s(%p, state=%s), not idle\n", |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 235 | dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 236 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 237 | |
Gerrit Renker | ff58629 | 2006-12-10 00:00:14 -0200 | [diff] [blame] | 238 | /* |
| 239 | * Modify the cached value of X_recv [RFC 3448, 4.4] |
| 240 | * |
| 241 | * If (p == 0 || X_calc > 2 * X_recv) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 242 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); |
| 243 | * Else |
| 244 | * X_recv = X_calc / 4; |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 245 | * |
| 246 | * Note that X_recv is scaled by 2^6 while X_calc is not |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 247 | */ |
Gerrit Renker | 4415830 | 2006-12-03 14:53:07 -0200 | [diff] [blame] | 248 | BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 249 | |
Gerrit Renker | 4415830 | 2006-12-03 14:53:07 -0200 | [diff] [blame] | 250 | if (hctx->ccid3hctx_p == 0 || |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 251 | (hctx->ccid3hctx_x_calc > |
| 252 | (hctx->ccid3hctx_x_recv >> 5))) { |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 253 | |
| 254 | hctx->ccid3hctx_x_recv = |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 255 | max(hctx->ccid3hctx_x_recv / 2, |
| 256 | (((__u64)hctx->ccid3hctx_s) << 6) / |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 257 | (2 * TFRC_T_MBI)); |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 258 | |
Gerrit Renker | ff58629 | 2006-12-10 00:00:14 -0200 | [diff] [blame] | 259 | if (hctx->ccid3hctx_p == 0) |
| 260 | dccp_timestamp(sk, &now); |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 261 | } else { |
| 262 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc; |
| 263 | hctx->ccid3hctx_x_recv <<= 4; |
| 264 | } |
Gerrit Renker | ff58629 | 2006-12-10 00:00:14 -0200 | [diff] [blame] | 265 | /* Now recalculate X [RFC 3448, 4.3, step (4)] */ |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 266 | ccid3_hc_tx_update_x(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 267 | } |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 268 | /* |
| 269 | * Schedule no feedback timer to expire in |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 270 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
| 271 | * See comments in packet_recv() regarding the value of t_RTO. |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 272 | */ |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 273 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 274 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 275 | case TFRC_SSTATE_NO_SENT: |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 276 | DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk), sk); |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 277 | /* fall through */ |
| 278 | case TFRC_SSTATE_TERM: |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 279 | goto out; |
| 280 | } |
| 281 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 282 | hctx->ccid3hctx_idle = 1; |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 283 | |
| 284 | restart_timer: |
| 285 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 286 | jiffies + usecs_to_jiffies(t_nfb)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 287 | out: |
| 288 | bh_unlock_sock(sk); |
| 289 | sock_put(sk); |
| 290 | } |
| 291 | |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 292 | /* |
| 293 | * returns |
| 294 | * > 0: delay (in msecs) that should pass before actually sending |
| 295 | * = 0: can send immediately |
| 296 | * < 0: error condition; do not send packet |
| 297 | */ |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 298 | static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 299 | { |
| 300 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 301 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 302 | struct timeval now; |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 303 | suseconds_t delay; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 304 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 305 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 306 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 307 | /* |
Gerrit Renker | da335ba | 2006-11-27 12:26:57 -0200 | [diff] [blame] | 308 | * This function is called only for Data and DataAck packets. Sending |
| 309 | * zero-sized Data(Ack)s is theoretically possible, but for congestion |
| 310 | * control this case is pathological - ignore it. |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 311 | */ |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 312 | if (unlikely(skb->len == 0)) |
Gerrit Renker | da335ba | 2006-11-27 12:26:57 -0200 | [diff] [blame] | 313 | return -EBADMSG; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 314 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 315 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 316 | |
| 317 | switch (hctx->ccid3hctx_state) { |
| 318 | case TFRC_SSTATE_NO_SENT: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 319 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 320 | (jiffies + |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 321 | usecs_to_jiffies(TFRC_INITIAL_TIMEOUT))); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 322 | hctx->ccid3hctx_last_win_count = 0; |
| 323 | hctx->ccid3hctx_t_last_win_count = now; |
| 324 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 325 | |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 326 | /* Set initial sending rate X/s to 1pps (X is scaled by 2^6) */ |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 327 | ccid3_hc_tx_update_s(hctx, skb->len); |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 328 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; |
| 329 | hctx->ccid3hctx_x <<= 6; |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 330 | |
Gerrit Renker | 90feeb9 | 2006-11-27 12:13:38 -0200 | [diff] [blame] | 331 | /* First timeout, according to [RFC 3448, 4.2], is 1 second */ |
| 332 | hctx->ccid3hctx_t_ipi = USEC_PER_SEC; |
| 333 | /* Initial delta: minimum of 0.5 sec and t_gran/2 */ |
| 334 | hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; |
| 335 | |
| 336 | /* Set t_0 for initial packet */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 337 | hctx->ccid3hctx_t_nom = now; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 338 | break; |
| 339 | case TFRC_SSTATE_NO_FBACK: |
| 340 | case TFRC_SSTATE_FBACK: |
Gerrit Renker | 91cf5a1 | 2006-11-27 12:25:10 -0200 | [diff] [blame] | 341 | delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); |
| 342 | /* |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 343 | * Scheduling of packet transmissions [RFC 3448, 4.6] |
Gerrit Renker | 91cf5a1 | 2006-11-27 12:25:10 -0200 | [diff] [blame] | 344 | * |
| 345 | * if (t_now > t_nom - delta) |
| 346 | * // send the packet now |
| 347 | * else |
| 348 | * // send the packet in (t_nom - t_now) milliseconds. |
| 349 | */ |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 350 | if (delay - (suseconds_t)hctx->ccid3hctx_delta >= 0) |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 351 | return delay / 1000L; |
Gerrit Renker | 9f8681d | 2006-12-10 00:07:37 -0200 | [diff] [blame] | 352 | |
| 353 | ccid3_hc_tx_update_win_count(hctx, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 354 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 355 | case TFRC_SSTATE_TERM: |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 356 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 357 | return -EINVAL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 358 | } |
| 359 | |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 360 | /* prepare to send now (add options etc.) */ |
| 361 | dp->dccps_hc_tx_insert_options = 1; |
Gerrit Renker | e312d10 | 2006-12-10 00:08:09 -0200 | [diff] [blame] | 362 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; |
| 363 | |
| 364 | /* set the nominal send time for the next following packet */ |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 365 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
| 366 | |
| 367 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 368 | } |
| 369 | |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 370 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, |
| 371 | unsigned int len) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 372 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 373 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 374 | struct timeval now; |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 375 | struct dccp_tx_hist_entry *packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 376 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 377 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 378 | |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 379 | ccid3_hc_tx_update_s(hctx, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 380 | |
Gerrit Renker | c5a1ae9 | 2006-12-10 00:09:21 -0200 | [diff] [blame] | 381 | packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC); |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 382 | if (unlikely(packet == NULL)) { |
Gerrit Renker | c5a1ae9 | 2006-12-10 00:09:21 -0200 | [diff] [blame] | 383 | DCCP_CRIT("packet history - out of memory!"); |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 384 | return; |
| 385 | } |
Gerrit Renker | c5a1ae9 | 2006-12-10 00:09:21 -0200 | [diff] [blame] | 386 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, packet); |
| 387 | |
| 388 | dccp_timestamp(sk, &now); |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 389 | packet->dccphtx_tstamp = now; |
Gerrit Renker | c5a1ae9 | 2006-12-10 00:09:21 -0200 | [diff] [blame] | 390 | packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss; |
| 391 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; |
| 392 | packet->dccphtx_sent = 1; |
| 393 | hctx->ccid3hctx_idle = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 394 | } |
| 395 | |
| 396 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 397 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 398 | const struct dccp_sock *dp = dccp_sk(sk); |
| 399 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 400 | struct ccid3_options_received *opt_recv; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 401 | struct dccp_tx_hist_entry *packet; |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 402 | struct timeval now; |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 403 | unsigned long t_nfb; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 404 | u32 pinv; |
Arnaldo Carvalho de Melo | 1fba78b | 2006-12-10 15:39:29 -0200 | [diff] [blame] | 405 | suseconds_t r_sample, t_elapsed; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 406 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 407 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 408 | |
| 409 | /* we are only interested in ACKs */ |
| 410 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || |
| 411 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) |
| 412 | return; |
| 413 | |
| 414 | opt_recv = &hctx->ccid3hctx_options_received; |
| 415 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 416 | switch (hctx->ccid3hctx_state) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 417 | case TFRC_SSTATE_NO_FBACK: |
| 418 | case TFRC_SSTATE_FBACK: |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 419 | /* get packet from history to look up t_recvdata */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 420 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 421 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 422 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 423 | DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 424 | "in history!\n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 425 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 426 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 427 | return; |
| 428 | } |
| 429 | |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 430 | /* Update receive rate in units of 64 * bytes/second */ |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 431 | hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; |
| 432 | hctx->ccid3hctx_x_recv <<= 6; |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 433 | |
| 434 | /* Update loss event rate */ |
| 435 | pinv = opt_recv->ccid3or_loss_event_rate; |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 436 | if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 437 | hctx->ccid3hctx_p = 0; |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 438 | else /* can not exceed 100% */ |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 439 | hctx->ccid3hctx_p = 1000000 / pinv; |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 440 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 441 | dccp_timestamp(sk, &now); |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 442 | |
| 443 | /* |
| 444 | * Calculate new round trip sample as per [RFC 3448, 4.3] by |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 445 | * R_sample = (now - t_recvdata) - t_elapsed |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 446 | */ |
| 447 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); |
| 448 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; |
| 449 | |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 450 | DCCP_BUG_ON(r_sample < 0); |
| 451 | if (unlikely(r_sample <= t_elapsed)) |
Arnaldo Carvalho de Melo | 1fba78b | 2006-12-10 15:39:29 -0200 | [diff] [blame] | 452 | DCCP_WARN("WARNING: r_sample=%dus <= t_elapsed=%dus\n", |
| 453 | (int)r_sample, (int)t_elapsed); |
Arnaldo Carvalho de Melo | 1a28599 | 2005-09-09 02:32:56 -0300 | [diff] [blame] | 454 | else |
| 455 | r_sample -= t_elapsed; |
Gerrit Renker | de553c1 | 2006-12-10 00:06:32 -0200 | [diff] [blame] | 456 | CCID3_RTT_SANITY_CHECK(r_sample); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 457 | |
Gerrit Renker | de553c1 | 2006-12-10 00:06:32 -0200 | [diff] [blame] | 458 | /* Update RTT estimate by |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 459 | * If (No feedback recv) |
| 460 | * R = R_sample; |
| 461 | * Else |
| 462 | * R = q * R + (1 - q) * R_sample; |
| 463 | * |
| 464 | * q is a constant, RFC 3448 recomments 0.9 |
| 465 | */ |
| 466 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 467 | /* |
| 468 | * Larger Initial Windows [RFC 4342, sec. 5] |
| 469 | * We deviate in that we use `s' instead of `MSS'. |
| 470 | */ |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 471 | __u64 w_init = min(4 * hctx->ccid3hctx_s, |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 472 | max(2 * hctx->ccid3hctx_s, 4380)); |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 473 | hctx->ccid3hctx_rtt = r_sample; |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 474 | hctx->ccid3hctx_x = scaled_div(w_init << 6, r_sample); |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 475 | hctx->ccid3hctx_t_ld = now; |
| 476 | |
| 477 | ccid3_update_send_time(hctx); |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 478 | |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 479 | ccid3_pr_debug("%s(%p), s=%u, w_init=%llu, " |
Arnaldo Carvalho de Melo | 1fba78b | 2006-12-10 15:39:29 -0200 | [diff] [blame] | 480 | "R_sample=%dus, X=%u\n", dccp_role(sk), |
Andrew Morton | 0f08461 | 2007-02-05 18:18:21 -0800 | [diff] [blame] | 481 | sk, hctx->ccid3hctx_s, |
| 482 | (unsigned long long)w_init, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 483 | (int)r_sample, |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 484 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 485 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 486 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 487 | } else { |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 488 | hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 489 | (u32)r_sample) / 10; |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 490 | |
Gerrit Renker | ff58629 | 2006-12-10 00:00:14 -0200 | [diff] [blame] | 491 | /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ |
| 492 | if (hctx->ccid3hctx_p > 0) |
| 493 | hctx->ccid3hctx_x_calc = |
| 494 | tfrc_calc_x(hctx->ccid3hctx_s, |
| 495 | hctx->ccid3hctx_rtt, |
| 496 | hctx->ccid3hctx_p); |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 497 | ccid3_hc_tx_update_x(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 498 | |
Arnaldo Carvalho de Melo | 1fba78b | 2006-12-10 15:39:29 -0200 | [diff] [blame] | 499 | ccid3_pr_debug("%s(%p), RTT=%uus (sample=%dus), s=%u, " |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 500 | "p=%u, X_calc=%u, X_recv=%u, X=%u\n", |
| 501 | dccp_role(sk), |
Arnaldo Carvalho de Melo | 1fba78b | 2006-12-10 15:39:29 -0200 | [diff] [blame] | 502 | sk, hctx->ccid3hctx_rtt, (int)r_sample, |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 503 | hctx->ccid3hctx_s, hctx->ccid3hctx_p, |
| 504 | hctx->ccid3hctx_x_calc, |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 505 | (unsigned)(hctx->ccid3hctx_x_recv >> 6), |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 506 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | /* unschedule no feedback timer */ |
| 510 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); |
| 511 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 512 | /* remove all packets older than the one acked from history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 513 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
| 514 | &hctx->ccid3hctx_hist, packet); |
Arnaldo Carvalho de Melo | c530cfb | 2005-08-29 02:15:54 -0300 | [diff] [blame] | 515 | /* |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 516 | * As we have calculated new ipi, delta, t_nom it is possible |
| 517 | * that we now can send a packet, so wake up dccp_wait_for_ccid |
Arnaldo Carvalho de Melo | c530cfb | 2005-08-29 02:15:54 -0300 | [diff] [blame] | 518 | */ |
| 519 | sk->sk_write_space(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 520 | |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 521 | /* |
| 522 | * Update timeout interval for the nofeedback timer. |
| 523 | * We use a configuration option to increase the lower bound. |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 524 | * This can help avoid triggering the nofeedback timer too |
| 525 | * often ('spinning') on LANs with small RTTs. |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 526 | */ |
Gerrit Renker | 5d0dbc4 | 2006-11-27 20:32:37 -0200 | [diff] [blame] | 527 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 528 | CONFIG_IP_DCCP_CCID3_RTO * |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 529 | (USEC_PER_SEC/1000)); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 530 | /* |
| 531 | * Schedule no feedback timer to expire in |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 532 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 533 | */ |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 534 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 535 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 536 | ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 537 | "expire in %lu jiffies (%luus)\n", |
| 538 | dccp_role(sk), |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 539 | sk, usecs_to_jiffies(t_nfb), t_nfb); |
| 540 | |
| 541 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 542 | jiffies + usecs_to_jiffies(t_nfb)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 543 | |
| 544 | /* set idle flag */ |
Gerrit Renker | bf58a38 | 2006-12-10 00:04:43 -0200 | [diff] [blame] | 545 | hctx->ccid3hctx_idle = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 546 | break; |
Gerrit Renker | 151a993 | 2007-03-07 12:53:48 -0800 | [diff] [blame] | 547 | case TFRC_SSTATE_NO_SENT: /* fall through */ |
Gerrit Renker | 5e19e3f | 2006-11-27 12:28:48 -0200 | [diff] [blame] | 548 | case TFRC_SSTATE_TERM: /* ignore feedback when closing */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 549 | break; |
| 550 | } |
| 551 | } |
| 552 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 553 | static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 554 | unsigned char len, u16 idx, |
| 555 | unsigned char *value) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 556 | { |
| 557 | int rc = 0; |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 558 | const struct dccp_sock *dp = dccp_sk(sk); |
| 559 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 560 | struct ccid3_options_received *opt_recv; |
| 561 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 562 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 563 | |
| 564 | opt_recv = &hctx->ccid3hctx_options_received; |
| 565 | |
| 566 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { |
| 567 | opt_recv->ccid3or_seqno = dp->dccps_gsr; |
| 568 | opt_recv->ccid3or_loss_event_rate = ~0; |
| 569 | opt_recv->ccid3or_loss_intervals_idx = 0; |
| 570 | opt_recv->ccid3or_loss_intervals_len = 0; |
| 571 | opt_recv->ccid3or_receive_rate = 0; |
| 572 | } |
| 573 | |
| 574 | switch (option) { |
| 575 | case TFRC_OPT_LOSS_EVENT_RATE: |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 576 | if (unlikely(len != 4)) { |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 577 | DCCP_WARN("%s(%p), invalid len %d " |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 578 | "for TFRC_OPT_LOSS_EVENT_RATE\n", |
| 579 | dccp_role(sk), sk, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 580 | rc = -EINVAL; |
| 581 | } else { |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 582 | opt_recv->ccid3or_loss_event_rate = |
| 583 | ntohl(*(__be32 *)value); |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 584 | ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 585 | dccp_role(sk), sk, |
| 586 | opt_recv->ccid3or_loss_event_rate); |
| 587 | } |
| 588 | break; |
| 589 | case TFRC_OPT_LOSS_INTERVALS: |
| 590 | opt_recv->ccid3or_loss_intervals_idx = idx; |
| 591 | opt_recv->ccid3or_loss_intervals_len = len; |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 592 | ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 593 | dccp_role(sk), sk, |
| 594 | opt_recv->ccid3or_loss_intervals_idx, |
| 595 | opt_recv->ccid3or_loss_intervals_len); |
| 596 | break; |
| 597 | case TFRC_OPT_RECEIVE_RATE: |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 598 | if (unlikely(len != 4)) { |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 599 | DCCP_WARN("%s(%p), invalid len %d " |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 600 | "for TFRC_OPT_RECEIVE_RATE\n", |
| 601 | dccp_role(sk), sk, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 602 | rc = -EINVAL; |
| 603 | } else { |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 604 | opt_recv->ccid3or_receive_rate = |
| 605 | ntohl(*(__be32 *)value); |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 606 | ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 607 | dccp_role(sk), sk, |
| 608 | opt_recv->ccid3or_receive_rate); |
| 609 | } |
| 610 | break; |
| 611 | } |
| 612 | |
| 613 | return rc; |
| 614 | } |
| 615 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 616 | static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 617 | { |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 618 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 619 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 620 | hctx->ccid3hctx_s = 0; |
Gerrit Renker | fe0499a | 2006-12-10 00:06:01 -0200 | [diff] [blame] | 621 | hctx->ccid3hctx_rtt = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 622 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
| 623 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | aa5d7df | 2006-03-20 17:35:13 -0800 | [diff] [blame] | 624 | |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 625 | hctx->ccid3hctx_no_feedback_timer.function = |
| 626 | ccid3_hc_tx_no_feedback_timer; |
Arnaldo Carvalho de Melo | aa5d7df | 2006-03-20 17:35:13 -0800 | [diff] [blame] | 627 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 628 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
| 629 | |
| 630 | return 0; |
| 631 | } |
| 632 | |
| 633 | static void ccid3_hc_tx_exit(struct sock *sk) |
| 634 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 635 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 636 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 637 | BUG_ON(hctx == NULL); |
| 638 | |
| 639 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); |
| 640 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); |
| 641 | |
| 642 | /* Empty packet history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 643 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 644 | } |
| 645 | |
Gerrit Renker | 9bf1747 | 2007-03-20 13:11:24 -0300 | [diff] [blame^] | 646 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) |
| 647 | { |
| 648 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 649 | |
Gerrit Renker | 9bf1747 | 2007-03-20 13:11:24 -0300 | [diff] [blame^] | 650 | /* Listen socks doesn't have a private CCID block */ |
| 651 | if (sk->sk_state == DCCP_LISTEN) |
| 652 | return; |
| 653 | |
| 654 | BUG_ON(hctx == NULL); |
| 655 | |
| 656 | info->tcpi_rto = hctx->ccid3hctx_t_rto; |
| 657 | info->tcpi_rtt = hctx->ccid3hctx_rtt; |
| 658 | } |
| 659 | |
| 660 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, |
| 661 | u32 __user *optval, int __user *optlen) |
| 662 | { |
| 663 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
| 664 | const void *val; |
| 665 | |
| 666 | /* Listen socks doesn't have a private CCID block */ |
| 667 | if (sk->sk_state == DCCP_LISTEN) |
| 668 | return -EINVAL; |
| 669 | |
| 670 | switch (optname) { |
| 671 | case DCCP_SOCKOPT_CCID_TX_INFO: |
| 672 | if (len < sizeof(hctx->ccid3hctx_tfrc)) |
| 673 | return -EINVAL; |
| 674 | len = sizeof(hctx->ccid3hctx_tfrc); |
| 675 | val = &hctx->ccid3hctx_tfrc; |
| 676 | break; |
| 677 | default: |
| 678 | return -ENOPROTOOPT; |
| 679 | } |
| 680 | |
| 681 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) |
| 682 | return -EFAULT; |
| 683 | |
| 684 | return 0; |
| 685 | } |
| 686 | |
| 687 | /* |
| 688 | * Receiver Half-Connection Routines |
| 689 | */ |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 690 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 691 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
| 692 | { |
| 693 | static char *ccid3_rx_state_names[] = { |
| 694 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", |
| 695 | [TFRC_RSTATE_DATA] = "DATA", |
| 696 | [TFRC_RSTATE_TERM] = "TERM", |
| 697 | }; |
| 698 | |
| 699 | return ccid3_rx_state_names[state]; |
| 700 | } |
| 701 | #endif |
| 702 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 703 | static void ccid3_hc_rx_set_state(struct sock *sk, |
| 704 | enum ccid3_hc_rx_states state) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 705 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 706 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 707 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
| 708 | |
| 709 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 710 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
| 711 | ccid3_rx_state_name(state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 712 | WARN_ON(state == oldstate); |
| 713 | hcrx->ccid3hcrx_state = state; |
| 714 | } |
| 715 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 716 | static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) |
| 717 | { |
| 718 | if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ |
| 719 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); |
| 720 | else |
| 721 | hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : |
| 722 | (9 * hcrx->ccid3hcrx_s + len) / 10; |
| 723 | } |
| 724 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 725 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
| 726 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 727 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 728 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 729 | struct dccp_rx_hist_entry *packet; |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 730 | struct timeval now; |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 731 | suseconds_t delta; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 732 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 733 | ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 734 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 735 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 736 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 737 | switch (hcrx->ccid3hcrx_state) { |
| 738 | case TFRC_RSTATE_NO_DATA: |
| 739 | hcrx->ccid3hcrx_x_recv = 0; |
| 740 | break; |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 741 | case TFRC_RSTATE_DATA: |
| 742 | delta = timeval_delta(&now, |
| 743 | &hcrx->ccid3hcrx_tstamp_last_feedback); |
| 744 | DCCP_BUG_ON(delta < 0); |
Gerrit Renker | b9039a2 | 2006-12-10 00:02:51 -0200 | [diff] [blame] | 745 | hcrx->ccid3hcrx_x_recv = |
| 746 | scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 747 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 748 | case TFRC_RSTATE_TERM: |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 749 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 750 | return; |
| 751 | } |
| 752 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 753 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 754 | if (unlikely(packet == NULL)) { |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 755 | DCCP_WARN("%s(%p), no data packet in history!\n", |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 756 | dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 757 | return; |
| 758 | } |
| 759 | |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 760 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 761 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 762 | hcrx->ccid3hcrx_bytes_recv = 0; |
| 763 | |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 764 | /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */ |
| 765 | delta = timeval_delta(&now, &packet->dccphrx_tstamp); |
| 766 | DCCP_BUG_ON(delta < 0); |
| 767 | hcrx->ccid3hcrx_elapsed_time = delta / 10; |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 768 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 769 | if (hcrx->ccid3hcrx_p == 0) |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 770 | hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ |
| 771 | else if (hcrx->ccid3hcrx_p > 1000000) { |
| 772 | DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); |
| 773 | hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ |
| 774 | } else |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 775 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 776 | |
Arnaldo Carvalho de Melo | 507d37c | 2005-09-09 02:30:07 -0300 | [diff] [blame] | 777 | dp->dccps_hc_rx_insert_options = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 778 | dccp_send_ack(sk); |
| 779 | } |
| 780 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 781 | static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 782 | { |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 783 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 784 | __be32 x_recv, pinv; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 785 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 786 | BUG_ON(hcrx == NULL); |
| 787 | |
| 788 | if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 789 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 790 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 791 | DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 792 | |
| 793 | if (dccp_packet_without_ack(skb)) |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 794 | return 0; |
| 795 | |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 796 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
| 797 | pinv = htonl(hcrx->ccid3hcrx_pinv); |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 798 | |
| 799 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && |
| 800 | dccp_insert_option_elapsed_time(sk, skb, |
| 801 | hcrx->ccid3hcrx_elapsed_time)) || |
| 802 | dccp_insert_option_timestamp(sk, skb) || |
| 803 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 804 | &pinv, sizeof(pinv)) || |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 805 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 806 | &x_recv, sizeof(x_recv))) |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 807 | return -1; |
| 808 | |
| 809 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 810 | } |
| 811 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 812 | /* calculate first loss interval |
| 813 | * |
| 814 | * returns estimated loss interval in usecs */ |
| 815 | |
| 816 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) |
| 817 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 818 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 819 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 820 | u32 x_recv, p; |
| 821 | suseconds_t rtt, delta; |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 822 | struct timeval tstamp = { 0, }; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 823 | int interval = 0; |
| 824 | int win_count = 0; |
| 825 | int step = 0; |
Gerrit Renker | bfe24a6 | 2006-12-10 00:03:30 -0200 | [diff] [blame] | 826 | u64 fval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 827 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 828 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
| 829 | dccphrx_node) { |
| 830 | if (dccp_rx_hist_entry_data_packet(entry)) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 831 | tail = entry; |
| 832 | |
| 833 | switch (step) { |
| 834 | case 0: |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 835 | tstamp = entry->dccphrx_tstamp; |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 836 | win_count = entry->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 837 | step = 1; |
| 838 | break; |
| 839 | case 1: |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 840 | interval = win_count - entry->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 841 | if (interval < 0) |
| 842 | interval += TFRC_WIN_COUNT_LIMIT; |
| 843 | if (interval > 4) |
| 844 | goto found; |
| 845 | break; |
| 846 | } |
| 847 | } |
| 848 | } |
| 849 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 850 | if (unlikely(step == 0)) { |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 851 | DCCP_WARN("%s(%p), packet history has no data packets!\n", |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 852 | dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 853 | return ~0; |
| 854 | } |
| 855 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 856 | if (unlikely(interval == 0)) { |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 857 | DCCP_WARN("%s(%p), Could not find a win_count interval > 0." |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 858 | "Defaulting to 1\n", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 859 | interval = 1; |
| 860 | } |
| 861 | found: |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 862 | if (!tail) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 863 | DCCP_CRIT("tail is null\n"); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 864 | return ~0; |
| 865 | } |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 866 | |
| 867 | delta = timeval_delta(&tstamp, &tail->dccphrx_tstamp); |
| 868 | DCCP_BUG_ON(delta < 0); |
| 869 | |
| 870 | rtt = delta * 4 / interval; |
Arnaldo Carvalho de Melo | 1fba78b | 2006-12-10 15:39:29 -0200 | [diff] [blame] | 871 | ccid3_pr_debug("%s(%p), approximated RTT to %dus\n", |
| 872 | dccp_role(sk), sk, (int)rtt); |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 873 | |
Gerrit Renker | bfe24a6 | 2006-12-10 00:03:30 -0200 | [diff] [blame] | 874 | /* |
| 875 | * Determine the length of the first loss interval via inverse lookup. |
| 876 | * Assume that X_recv can be computed by the throughput equation |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 877 | * s |
| 878 | * X_recv = -------- |
| 879 | * R * fval |
Gerrit Renker | bfe24a6 | 2006-12-10 00:03:30 -0200 | [diff] [blame] | 880 | * Find some p such that f(p) = fval; return 1/p [RFC 3448, 6.3.1]. |
| 881 | */ |
| 882 | if (rtt == 0) { /* would result in divide-by-zero */ |
Ian McDonald | 832e3ca | 2006-12-12 00:47:59 -0200 | [diff] [blame] | 883 | DCCP_WARN("RTT==0\n"); |
| 884 | return ~0; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 885 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 886 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 887 | dccp_timestamp(sk, &tstamp); |
| 888 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 889 | DCCP_BUG_ON(delta <= 0); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 890 | |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 891 | x_recv = scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); |
Gerrit Renker | bfe24a6 | 2006-12-10 00:03:30 -0200 | [diff] [blame] | 892 | if (x_recv == 0) { /* would also trigger divide-by-zero */ |
| 893 | DCCP_WARN("X_recv==0\n"); |
| 894 | if ((x_recv = hcrx->ccid3hcrx_x_recv) == 0) { |
| 895 | DCCP_BUG("stored value of X_recv is zero"); |
Ian McDonald | 832e3ca | 2006-12-12 00:47:59 -0200 | [diff] [blame] | 896 | return ~0; |
Gerrit Renker | bfe24a6 | 2006-12-10 00:03:30 -0200 | [diff] [blame] | 897 | } |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 898 | } |
| 899 | |
Gerrit Renker | bfe24a6 | 2006-12-10 00:03:30 -0200 | [diff] [blame] | 900 | fval = scaled_div(hcrx->ccid3hcrx_s, rtt); |
| 901 | fval = scaled_div32(fval, x_recv); |
Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 902 | p = tfrc_calc_x_reverse_lookup(fval); |
Gerrit Renker | bfe24a6 | 2006-12-10 00:03:30 -0200 | [diff] [blame] | 903 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 904 | ccid3_pr_debug("%s(%p), receive rate=%u bytes/s, implied " |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 905 | "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 906 | |
| 907 | if (p == 0) |
| 908 | return ~0; |
| 909 | else |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 910 | return 1000000 / p; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 911 | } |
| 912 | |
| 913 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) |
| 914 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 915 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 916 | struct dccp_li_hist_entry *head; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 917 | u64 seq_temp; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 918 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 919 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
| 920 | if (!dccp_li_hist_interval_new(ccid3_li_hist, |
| 921 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 922 | return; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 923 | |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 924 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
| 925 | struct dccp_li_hist_entry, dccplih_node); |
| 926 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 927 | } else { |
| 928 | struct dccp_li_hist_entry *entry; |
| 929 | struct list_head *tail; |
| 930 | |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 931 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
| 932 | struct dccp_li_hist_entry, dccplih_node); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 933 | /* FIXME win count check removed as was wrong */ |
| 934 | /* should make this check with receive history */ |
| 935 | /* and compare there as per section 10.2 of RFC4342 */ |
| 936 | |
| 937 | /* new loss event detected */ |
| 938 | /* calculate last interval length */ |
| 939 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); |
Christoph Lameter | 54e6ecb | 2006-12-06 20:33:16 -0800 | [diff] [blame] | 940 | entry = dccp_li_hist_entry_new(ccid3_li_hist, GFP_ATOMIC); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 941 | |
| 942 | if (entry == NULL) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 943 | DCCP_BUG("out of memory - can not allocate entry"); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 944 | return; |
| 945 | } |
| 946 | |
| 947 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); |
| 948 | |
| 949 | tail = hcrx->ccid3hcrx_li_hist.prev; |
| 950 | list_del(tail); |
| 951 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); |
| 952 | |
| 953 | /* Create the newest interval */ |
| 954 | entry->dccplih_seqno = seq_loss; |
| 955 | entry->dccplih_interval = seq_temp; |
| 956 | entry->dccplih_win_count = win_loss; |
| 957 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 958 | } |
| 959 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 960 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 961 | struct dccp_rx_hist_entry *packet) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 962 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 963 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 964 | struct dccp_rx_hist_entry *rx_hist = |
| 965 | dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 966 | u64 seqno = packet->dccphrx_seqno; |
| 967 | u64 tmp_seqno; |
| 968 | int loss = 0; |
| 969 | u8 ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 970 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 971 | |
| 972 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; |
| 973 | |
| 974 | if (!rx_hist || |
| 975 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { |
| 976 | hcrx->ccid3hcrx_seqno_nonloss = seqno; |
| 977 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; |
| 978 | goto detect_out; |
| 979 | } |
| 980 | |
| 981 | |
| 982 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
| 983 | > TFRC_RECV_NUM_LATE_LOSS) { |
| 984 | loss = 1; |
| 985 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, |
| 986 | hcrx->ccid3hcrx_ccval_nonloss); |
| 987 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; |
| 988 | dccp_inc_seqno(&tmp_seqno); |
| 989 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
| 990 | dccp_inc_seqno(&tmp_seqno); |
| 991 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, |
| 992 | tmp_seqno, &ccval)) { |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 993 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 994 | hcrx->ccid3hcrx_ccval_nonloss = ccval; |
| 995 | dccp_inc_seqno(&tmp_seqno); |
| 996 | } |
| 997 | } |
| 998 | |
| 999 | /* FIXME - this code could be simplified with above while */ |
| 1000 | /* but works at moment */ |
| 1001 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { |
| 1002 | hcrx->ccid3hcrx_seqno_nonloss = seqno; |
| 1003 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; |
| 1004 | } |
| 1005 | |
| 1006 | detect_out: |
| 1007 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, |
| 1008 | &hcrx->ccid3hcrx_li_hist, packet, |
| 1009 | hcrx->ccid3hcrx_seqno_nonloss); |
| 1010 | return loss; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1011 | } |
| 1012 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1013 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 1014 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1015 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 1016 | const struct dccp_options_received *opt_recv; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1017 | struct dccp_rx_hist_entry *packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1018 | struct timeval now; |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 1019 | u32 p_prev, rtt_prev; |
| 1020 | suseconds_t r_sample, t_elapsed; |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 1021 | int loss, payload_size; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1022 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1023 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1024 | |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1025 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 1026 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1027 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
| 1028 | case DCCP_PKT_ACK: |
| 1029 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) |
| 1030 | return; |
| 1031 | case DCCP_PKT_DATAACK: |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 1032 | if (opt_recv->dccpor_timestamp_echo == 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1033 | break; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1034 | rtt_prev = hcrx->ccid3hcrx_rtt; |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1035 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b3a3077 | 2005-09-09 02:34:10 -0300 | [diff] [blame] | 1036 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
| 1037 | r_sample = timeval_usecs(&now); |
| 1038 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; |
| 1039 | |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 1040 | DCCP_BUG_ON(r_sample < 0); |
Arnaldo Carvalho de Melo | b3a3077 | 2005-09-09 02:34:10 -0300 | [diff] [blame] | 1041 | if (unlikely(r_sample <= t_elapsed)) |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 1042 | DCCP_WARN("r_sample=%ldus, t_elapsed=%ldus\n", |
Andrew Morton | 0f08461 | 2007-02-05 18:18:21 -0800 | [diff] [blame] | 1043 | (long)r_sample, (long)t_elapsed); |
Arnaldo Carvalho de Melo | b3a3077 | 2005-09-09 02:34:10 -0300 | [diff] [blame] | 1044 | else |
| 1045 | r_sample -= t_elapsed; |
Gerrit Renker | de553c1 | 2006-12-10 00:06:32 -0200 | [diff] [blame] | 1046 | CCID3_RTT_SANITY_CHECK(r_sample); |
Arnaldo Carvalho de Melo | b3a3077 | 2005-09-09 02:34:10 -0300 | [diff] [blame] | 1047 | |
| 1048 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) |
| 1049 | hcrx->ccid3hcrx_rtt = r_sample; |
| 1050 | else |
| 1051 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + |
| 1052 | r_sample / 10; |
| 1053 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1054 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 1055 | ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n", |
| 1056 | dccp_role(sk), sk, hcrx->ccid3hcrx_rtt, |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 1057 | opt_recv->dccpor_elapsed_time); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1058 | break; |
| 1059 | case DCCP_PKT_DATA: |
| 1060 | break; |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1061 | default: /* We're not interested in other packet types, move along */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1062 | return; |
| 1063 | } |
| 1064 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1065 | packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, |
Christoph Lameter | 54e6ecb | 2006-12-06 20:33:16 -0800 | [diff] [blame] | 1066 | skb, GFP_ATOMIC); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1067 | if (unlikely(packet == NULL)) { |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 1068 | DCCP_WARN("%s(%p), Not enough mem to add rx packet " |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1069 | "to history, consider it lost!\n", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1070 | return; |
| 1071 | } |
| 1072 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1073 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1074 | |
| 1075 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) |
| 1076 | return; |
| 1077 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 1078 | payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; |
| 1079 | ccid3_hc_rx_update_s(hcrx, payload_size); |
| 1080 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1081 | switch (hcrx->ccid3hcrx_state) { |
| 1082 | case TFRC_RSTATE_NO_DATA: |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 1083 | ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial " |
| 1084 | "feedback\n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1085 | dccp_state_name(sk->sk_state), skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1086 | ccid3_hc_rx_send_feedback(sk); |
| 1087 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); |
| 1088 | return; |
| 1089 | case TFRC_RSTATE_DATA: |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 1090 | hcrx->ccid3hcrx_bytes_recv += payload_size; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1091 | if (loss) |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1092 | break; |
| 1093 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1094 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 1095 | if ((timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) - |
| 1096 | (suseconds_t)hcrx->ccid3hcrx_rtt) >= 0) { |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1097 | hcrx->ccid3hcrx_tstamp_last_ack = now; |
| 1098 | ccid3_hc_rx_send_feedback(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1099 | } |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1100 | return; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1101 | case TFRC_RSTATE_TERM: |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 1102 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1103 | return; |
| 1104 | } |
| 1105 | |
| 1106 | /* Dealing with packet loss */ |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 1107 | ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n", |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 1108 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1109 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1110 | p_prev = hcrx->ccid3hcrx_p; |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 1111 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1112 | /* Calculate loss event rate */ |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 1113 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
| 1114 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); |
| 1115 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1116 | /* Scaling up by 1000000 as fixed decimal */ |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 1117 | if (i_mean != 0) |
| 1118 | hcrx->ccid3hcrx_p = 1000000 / i_mean; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1119 | } else |
| 1120 | DCCP_BUG("empty loss history"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1121 | |
| 1122 | if (hcrx->ccid3hcrx_p > p_prev) { |
| 1123 | ccid3_hc_rx_send_feedback(sk); |
| 1124 | return; |
| 1125 | } |
| 1126 | } |
| 1127 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1128 | static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1129 | { |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1130 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1131 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 1132 | ccid3_pr_debug("entry\n"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1133 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1134 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; |
| 1135 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1136 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1137 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
Arnaldo Carvalho de Melo | 954ee31 | 2005-09-09 02:37:05 -0300 | [diff] [blame] | 1138 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 1139 | hcrx->ccid3hcrx_s = 0; |
Gerrit Renker | fe0499a | 2006-12-10 00:06:01 -0200 | [diff] [blame] | 1140 | hcrx->ccid3hcrx_rtt = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1141 | return 0; |
| 1142 | } |
| 1143 | |
| 1144 | static void ccid3_hc_rx_exit(struct sock *sk) |
| 1145 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1146 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1147 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1148 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1149 | |
| 1150 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); |
| 1151 | |
| 1152 | /* Empty packet history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1153 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1154 | |
| 1155 | /* Empty loss interval history */ |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1156 | dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1157 | } |
| 1158 | |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1159 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
| 1160 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1161 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1162 | |
Arnaldo Carvalho de Melo | 59c2353 | 2005-09-12 14:16:58 -0700 | [diff] [blame] | 1163 | /* Listen socks doesn't have a private CCID block */ |
| 1164 | if (sk->sk_state == DCCP_LISTEN) |
| 1165 | return; |
| 1166 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1167 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1168 | |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 1169 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; |
| 1170 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; |
| 1171 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1172 | } |
| 1173 | |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1174 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
| 1175 | u32 __user *optval, int __user *optlen) |
| 1176 | { |
| 1177 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
| 1178 | const void *val; |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 1179 | |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1180 | /* Listen socks doesn't have a private CCID block */ |
| 1181 | if (sk->sk_state == DCCP_LISTEN) |
| 1182 | return -EINVAL; |
| 1183 | |
| 1184 | switch (optname) { |
| 1185 | case DCCP_SOCKOPT_CCID_RX_INFO: |
| 1186 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) |
| 1187 | return -EINVAL; |
| 1188 | len = sizeof(hcrx->ccid3hcrx_tfrc); |
| 1189 | val = &hcrx->ccid3hcrx_tfrc; |
| 1190 | break; |
| 1191 | default: |
| 1192 | return -ENOPROTOOPT; |
| 1193 | } |
| 1194 | |
| 1195 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) |
| 1196 | return -EFAULT; |
| 1197 | |
| 1198 | return 0; |
| 1199 | } |
| 1200 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1201 | static struct ccid_operations ccid3 = { |
Ian McDonald | 3dd9a7c | 2006-09-22 14:26:44 +1200 | [diff] [blame] | 1202 | .ccid_id = DCCPC_CCID3, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1203 | .ccid_name = "ccid3", |
| 1204 | .ccid_owner = THIS_MODULE, |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1205 | .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1206 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
| 1207 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, |
| 1208 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, |
| 1209 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, |
| 1210 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1211 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1212 | .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1213 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
| 1214 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, |
| 1215 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, |
| 1216 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1217 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
| 1218 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1219 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
| 1220 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1221 | }; |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 1222 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 1223 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1224 | module_param(ccid3_debug, int, 0444); |
| 1225 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 1226 | #endif |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1227 | |
| 1228 | static __init int ccid3_module_init(void) |
| 1229 | { |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1230 | int rc = -ENOBUFS; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1231 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1232 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
| 1233 | if (ccid3_rx_hist == NULL) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1234 | goto out; |
| 1235 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1236 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
| 1237 | if (ccid3_tx_hist == NULL) |
| 1238 | goto out_free_rx; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1239 | |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1240 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
| 1241 | if (ccid3_li_hist == NULL) |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1242 | goto out_free_tx; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1243 | |
| 1244 | rc = ccid_register(&ccid3); |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 1245 | if (rc != 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1246 | goto out_free_loss_interval_history; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1247 | out: |
| 1248 | return rc; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1249 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1250 | out_free_loss_interval_history: |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1251 | dccp_li_hist_delete(ccid3_li_hist); |
| 1252 | ccid3_li_hist = NULL; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1253 | out_free_tx: |
| 1254 | dccp_tx_hist_delete(ccid3_tx_hist); |
| 1255 | ccid3_tx_hist = NULL; |
| 1256 | out_free_rx: |
| 1257 | dccp_rx_hist_delete(ccid3_rx_hist); |
| 1258 | ccid3_rx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1259 | goto out; |
| 1260 | } |
| 1261 | module_init(ccid3_module_init); |
| 1262 | |
| 1263 | static __exit void ccid3_module_exit(void) |
| 1264 | { |
| 1265 | ccid_unregister(&ccid3); |
| 1266 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1267 | if (ccid3_tx_hist != NULL) { |
| 1268 | dccp_tx_hist_delete(ccid3_tx_hist); |
| 1269 | ccid3_tx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1270 | } |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1271 | if (ccid3_rx_hist != NULL) { |
| 1272 | dccp_rx_hist_delete(ccid3_rx_hist); |
| 1273 | ccid3_rx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1274 | } |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1275 | if (ccid3_li_hist != NULL) { |
| 1276 | dccp_li_hist_delete(ccid3_li_hist); |
| 1277 | ccid3_li_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1278 | } |
| 1279 | } |
| 1280 | module_exit(ccid3_module_exit); |
| 1281 | |
Ian McDonald | e6bccd3 | 2006-08-26 19:01:30 -0700 | [diff] [blame] | 1282 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1283 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1284 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
| 1285 | MODULE_LICENSE("GPL"); |
| 1286 | MODULE_ALIAS("net-dccp-ccid-3"); |