[DCCP]: Initial implementation
Development to this point was done on a subversion repository at:
http://oops.ghostprotocols.net:81/cgi-bin/viewcvs.cgi/dccp-2.6/
This repository will be kept at this site for the foreseable future,
so that interested parties can see the history of this code,
attributions, etc.
If I ever decide to take this offline I'll provide the full history at
some other suitable place.
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/dccp/ccids/Kconfig b/net/dccp/ccids/Kconfig
new file mode 100644
index 0000000..67f9c06
--- /dev/null
+++ b/net/dccp/ccids/Kconfig
@@ -0,0 +1,25 @@
+menu "DCCP CCIDs Configuration (EXPERIMENTAL)"
+ depends on IP_DCCP && EXPERIMENTAL
+
+config IP_DCCP_CCID3
+ tristate "CCID3 (TFRC) (EXPERIMENTAL)"
+ depends on IP_DCCP
+ ---help---
+ CCID 3 denotes TCP-Friendly Rate Control (TFRC), an equation-based
+ rate-controlled congestion control mechanism. TFRC is designed to
+ be reasonably fair when competing for bandwidth with TCP-like flows,
+ where a flow is "reasonably fair" if its sending rate is generally
+ within a factor of two of the sending rate of a TCP flow under the
+ same conditions. However, TFRC has a much lower variation of
+ throughput over time compared with TCP, which makes CCID 3 more
+ suitable than CCID 2 for applications such streaming media where a
+ relatively smooth sending rate is of importance.
+
+ CCID 3 is further described in [CCID 3 PROFILE]. The TFRC
+ congestion control algorithms were initially described in RFC 3448.
+
+ This text was extracted from draft-ietf-dccp-spec-11.txt.
+
+ If in doubt, say M.
+
+endmenu
diff --git a/net/dccp/ccids/Makefile b/net/dccp/ccids/Makefile
new file mode 100644
index 0000000..1c72013
--- /dev/null
+++ b/net/dccp/ccids/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_IP_DCCP_CCID3) += dccp_ccid3.o
+
+dccp_ccid3-y := ccid3.o
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
new file mode 100644
index 0000000..4f45902
--- /dev/null
+++ b/net/dccp/ccids/ccid3.c
@@ -0,0 +1,2164 @@
+/*
+ * net/dccp/ccids/ccid3.c
+ *
+ * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
+ *
+ * An implementation of the DCCP protocol
+ *
+ * This code has been developed by the University of Waikato WAND
+ * research group. For further information please see http://www.wand.net.nz/
+ * or e-mail Ian McDonald - iam4@cs.waikato.ac.nz
+ *
+ * This code also uses code from Lulea University, rereleased as GPL by its
+ * authors:
+ * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
+ *
+ * Changes to meet Linux coding standards, to make it meet latest ccid3 draft
+ * and to make it work as a loadable module in the DCCP stack written by
+ * Arnaldo Carvalho de Melo <acme@conectiva.com.br>.
+ *
+ * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "../ccid.h"
+#include "../dccp.h"
+#include "ccid3.h"
+
+#ifdef CCID3_DEBUG
+extern int ccid3_debug;
+
+#define ccid3_pr_debug(format, a...) \
+ do { if (ccid3_debug) \
+ printk(KERN_DEBUG "%s: " format, __FUNCTION__, ##a); \
+ } while (0)
+#else
+#define ccid3_pr_debug(format, a...)
+#endif
+
+#define TFRC_MIN_PACKET_SIZE 16
+#define TFRC_STD_PACKET_SIZE 256
+#define TFRC_MAX_PACKET_SIZE 65535
+
+#define USEC_IN_SEC 1000000
+
+#define TFRC_INITIAL_TIMEOUT (2 * USEC_IN_SEC)
+/* two seconds as per CCID3 spec 11 */
+
+#define TFRC_OPSYS_HALF_TIME_GRAN (USEC_IN_SEC / (2 * HZ))
+/* above is in usecs - half the scheduling granularity as per RFC3448 4.6 */
+
+#define TFRC_WIN_COUNT_PER_RTT 4
+#define TFRC_WIN_COUNT_LIMIT 16
+
+#define TFRC_MAX_BACK_OFF_TIME 64
+/* above is in seconds */
+
+#define TFRC_SMALLEST_P 40
+
+#define TFRC_RECV_IVAL_F_LENGTH 8 /* length(w[]) */
+
+/* Number of later packets received before one is considered lost */
+#define TFRC_RECV_NUM_LATE_LOSS 3
+
+enum ccid3_options {
+ TFRC_OPT_LOSS_EVENT_RATE = 192,
+ TFRC_OPT_LOSS_INTERVALS = 193,
+ TFRC_OPT_RECEIVE_RATE = 194,
+};
+
+static int ccid3_debug;
+
+static kmem_cache_t *ccid3_tx_hist_slab;
+static kmem_cache_t *ccid3_rx_hist_slab;
+static kmem_cache_t *ccid3_loss_interval_hist_slab;
+
+static inline struct ccid3_tx_hist_entry *ccid3_tx_hist_entry_new(int prio)
+{
+ struct ccid3_tx_hist_entry *entry = kmem_cache_alloc(ccid3_tx_hist_slab, prio);
+
+ if (entry != NULL)
+ entry->ccid3htx_sent = 0;
+
+ return entry;
+}
+
+static inline void ccid3_tx_hist_entry_delete(struct ccid3_tx_hist_entry *entry)
+{
+ if (entry != NULL)
+ kmem_cache_free(ccid3_tx_hist_slab, entry);
+}
+
+static inline struct ccid3_rx_hist_entry *ccid3_rx_hist_entry_new(struct sock *sk,
+ struct sk_buff *skb,
+ int prio)
+{
+ struct ccid3_rx_hist_entry *entry = kmem_cache_alloc(ccid3_rx_hist_slab, prio);
+
+ if (entry != NULL) {
+ const struct dccp_hdr *dh = dccp_hdr(skb);
+
+ entry->ccid3hrx_seqno = DCCP_SKB_CB(skb)->dccpd_seq;
+ entry->ccid3hrx_win_count = dh->dccph_ccval;
+ entry->ccid3hrx_type = dh->dccph_type;
+ entry->ccid3hrx_ndp = dccp_sk(sk)->dccps_options_received.dccpor_ndp;
+ do_gettimeofday(&(entry->ccid3hrx_tstamp));
+ }
+
+ return entry;
+}
+
+static inline void ccid3_rx_hist_entry_delete(struct ccid3_rx_hist_entry *entry)
+{
+ if (entry != NULL)
+ kmem_cache_free(ccid3_rx_hist_slab, entry);
+}
+
+static void ccid3_rx_history_delete(struct list_head *hist)
+{
+ struct ccid3_rx_hist_entry *entry, *next;
+
+ list_for_each_entry_safe(entry, next, hist, ccid3hrx_node) {
+ list_del_init(&entry->ccid3hrx_node);
+ kmem_cache_free(ccid3_rx_hist_slab, entry);
+ }
+}
+
+static inline struct ccid3_loss_interval_hist_entry *ccid3_loss_interval_hist_entry_new(int prio)
+{
+ return kmem_cache_alloc(ccid3_loss_interval_hist_slab, prio);
+}
+
+static inline void ccid3_loss_interval_hist_entry_delete(struct ccid3_loss_interval_hist_entry *entry)
+{
+ if (entry != NULL)
+ kmem_cache_free(ccid3_loss_interval_hist_slab, entry);
+}
+
+static void ccid3_loss_interval_history_delete(struct list_head *hist)
+{
+ struct ccid3_loss_interval_hist_entry *entry, *next;
+
+ list_for_each_entry_safe(entry, next, hist, ccid3lih_node) {
+ list_del_init(&entry->ccid3lih_node);
+ kmem_cache_free(ccid3_loss_interval_hist_slab, entry);
+ }
+}
+
+static int ccid3_init(struct sock *sk)
+{
+ ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
+ return 0;
+}
+
+static void ccid3_exit(struct sock *sk)
+{
+ ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
+}
+
+/* TFRC sender states */
+enum ccid3_hc_tx_states {
+ TFRC_SSTATE_NO_SENT = 1,
+ TFRC_SSTATE_NO_FBACK,
+ TFRC_SSTATE_FBACK,
+ TFRC_SSTATE_TERM,
+};
+
+#ifdef CCID3_DEBUG
+static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state)
+{
+ static char *ccid3_state_names[] = {
+ [TFRC_SSTATE_NO_SENT] = "NO_SENT",
+ [TFRC_SSTATE_NO_FBACK] = "NO_FBACK",
+ [TFRC_SSTATE_FBACK] = "FBACK",
+ [TFRC_SSTATE_TERM] = "TERM",
+ };
+
+ return ccid3_state_names[state];
+}
+#endif
+
+static inline void ccid3_hc_tx_set_state(struct sock *sk, enum ccid3_hc_tx_states state)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+ enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state;
+
+ ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
+ dccp_role(sk), sk, ccid3_tx_state_name(oldstate), ccid3_tx_state_name(state));
+ WARN_ON(state == oldstate);
+ hctx->ccid3hctx_state = state;
+}
+
+static void timeval_sub(struct timeval large, struct timeval small, struct timeval *result) {
+
+ result->tv_sec = large.tv_sec-small.tv_sec;
+ if (large.tv_usec < small.tv_usec) {
+ (result->tv_sec)--;
+ result->tv_usec = USEC_IN_SEC+large.tv_usec-small.tv_usec;
+ } else
+ result->tv_usec = large.tv_usec-small.tv_usec;
+}
+
+static inline void timeval_fix(struct timeval *tv) {
+ if (tv->tv_usec >= USEC_IN_SEC) {
+ tv->tv_sec++;
+ tv->tv_usec -= USEC_IN_SEC;
+ }
+}
+
+/* returns the difference in usecs between timeval passed in and current time */
+static inline u32 now_delta(struct timeval tv) {
+ struct timeval now;
+
+ do_gettimeofday(&now);
+ return ((now.tv_sec-tv.tv_sec)*1000000+now.tv_usec-tv.tv_usec);
+}
+
+#define CALCX_ARRSIZE 500
+
+#define CALCX_SPLIT 50000
+/* equivalent to 0.05 */
+
+static const u32 calcx_lookup[CALCX_ARRSIZE][2] = {
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+ { 89760475 , 212985 },
+ { 90574339 , 213432 },
+ { 91393551 , 213878 },
+ { 92218133 , 214325 },
+ { 93048107 , 214772 },
+ { 93883493 , 215219 },
+ { 94724314 , 215666 },
+ { 95570590 , 216114 },
+ { 96422343 , 216561 },
+ { 97279594 , 217009 },
+ { 98142366 , 217457 },
+ { 99010679 , 217905 },
+ { 99884556 , 218353 },
+ { 100764018 , 218801 },
+ { 101649086 , 219250 },
+ { 102539782 , 219698 },
+ { 103436128 , 220147 },
+ { 104338146 , 220596 },
+ { 105245857 , 221046 },
+ { 106159284 , 221495 },
+ { 107078448 , 221945 },
+ { 108003370 , 222394 },
+ { 108934074 , 222844 },
+ { 109870580 , 223294 },
+ { 110812910 , 223745 },
+ { 111761087 , 224195 },
+ { 112715133 , 224646 },
+ { 113675069 , 225097 },
+ { 114640918 , 225548 },
+ { 115612702 , 225999 },
+ { 116590442 , 226450 },
+ { 117574162 , 226902 },
+ { 118563882 , 227353 },
+ { 119559626 , 227805 },
+ { 120561415 , 228258 },
+ { 121569272 , 228710 },
+ { 122583219 , 229162 },
+ { 123603278 , 229615 },
+ { 124629471 , 230068 },
+ { 125661822 , 230521 },
+ { 126700352 , 230974 },
+ { 127745083 , 231428 },
+ { 128796039 , 231882 },
+ { 129853241 , 232336 },
+ { 130916713 , 232790 },
+ { 131986475 , 233244 },
+ { 133062553 , 233699 },
+ { 134144966 , 234153 },
+ { 135233739 , 234608 },
+ { 136328894 , 235064 },
+ { 137430453 , 235519 },
+ { 138538440 , 235975 },
+ { 139652876 , 236430 },
+ { 140773786 , 236886 },
+ { 141901190 , 237343 },
+ { 143035113 , 237799 },
+ { 144175576 , 238256 },
+ { 145322604 , 238713 },
+ { 146476218 , 239170 },
+ { 147636442 , 239627 },
+ { 148803298 , 240085 },
+ { 149976809 , 240542 },
+ { 151156999 , 241000 },
+ { 152343890 , 241459 },
+ { 153537506 , 241917 },
+ { 154737869 , 242376 },
+ { 155945002 , 242835 },
+ { 157158929 , 243294 },
+ { 158379673 , 243753 },
+ { 159607257 , 244213 },
+ { 160841704 , 244673 },
+ { 162083037 , 245133 },
+ { 163331279 , 245593 },
+ { 164586455 , 246054 },
+ { 165848586 , 246514 },
+ { 167117696 , 246975 },
+ { 168393810 , 247437 },
+ { 169676949 , 247898 },
+ { 170967138 , 248360 },
+ { 172264399 , 248822 },
+ { 173568757 , 249284 },
+ { 174880235 , 249747 },
+ { 176198856 , 250209 },
+ { 177524643 , 250672 },
+ { 178857621 , 251136 },
+ { 180197813 , 251599 },
+ { 181545242 , 252063 },
+ { 182899933 , 252527 },
+ { 184261908 , 252991 },
+ { 185631191 , 253456 },
+ { 187007807 , 253920 },
+ { 188391778 , 254385 },
+ { 189783129 , 254851 },
+ { 191181884 , 255316 },
+ { 192588065 , 255782 },
+ { 194001698 , 256248 },
+ { 195422805 , 256714 },
+ { 196851411 , 257181 },
+ { 198287540 , 257648 },
+ { 199731215 , 258115 },
+ { 201182461 , 258582 },
+ { 202641302 , 259050 },
+ { 204107760 , 259518 },
+ { 205581862 , 259986 },
+ { 207063630 , 260454 },
+ { 208553088 , 260923 },
+ { 210050262 , 261392 },
+ { 211555174 , 261861 },
+ { 213067849 , 262331 },
+ { 214588312 , 262800 },
+ { 216116586 , 263270 },
+ { 217652696 , 263741 },
+ { 219196666 , 264211 },
+ { 220748520 , 264682 },
+ { 222308282 , 265153 },
+ { 223875978 , 265625 },
+ { 225451630 , 266097 },
+ { 227035265 , 266569 },
+ { 228626905 , 267041 },
+ { 230226576 , 267514 },
+ { 231834302 , 267986 },
+ { 233450107 , 268460 },
+ { 235074016 , 268933 },
+ { 236706054 , 269407 },
+ { 238346244 , 269881 },
+ { 239994613 , 270355 },
+ { 241651183 , 270830 },
+ { 243315981 , 271305 }
+};
+
+/* Calculate the send rate as per section 3.1 of RFC3448
+
+Returns send rate in bytes per second
+
+Integer maths and lookups are used as not allowed floating point in kernel
+
+The function for Xcalc as per section 3.1 of RFC3448 is:
+
+X = s
+ -------------------------------------------------------------
+ R*sqrt(2*b*p/3) + (t_RTO * (3*sqrt(3*b*p/8) * p * (1+32*p^2)))
+
+where
+X is the trasmit rate in bytes/second
+s is the packet size in bytes
+R is the round trip time in seconds
+p is the loss event rate, between 0 and 1.0, of the number of loss events
+ as a fraction of the number of packets transmitted
+t_RTO is the TCP retransmission timeout value in seconds
+b is the number of packets acknowledged by a single TCP acknowledgement
+
+we can assume that b = 1 and t_RTO is 4 * R. With this the equation becomes:
+
+X = s
+ -----------------------------------------------------------------------
+ R * sqrt(2 * p / 3) + (12 * R * (sqrt(3 * p / 8) * p * (1 + 32 * p^2)))
+
+
+which we can break down into:
+
+X = s
+ --------
+ R * f(p)
+
+where f(p) = sqrt(2 * p / 3) + (12 * sqrt(3 * p / 8) * p * (1 + 32 * p * p))
+
+Function parameters:
+s - bytes
+R - RTT in usecs
+p - loss rate (decimal fraction multiplied by 1,000,000)
+
+Returns Xcalc in bytes per second
+
+DON'T alter this code unless you run test cases against it as the code
+has been manipulated to stop underflow/overlow.
+
+*/
+static u32 ccid3_calc_x(u16 s, u32 R, u32 p)
+{
+ int index;
+ u32 f;
+ u64 tmp1, tmp2;
+
+ if (p < CALCX_SPLIT)
+ index = (p / (CALCX_SPLIT / CALCX_ARRSIZE)) - 1;
+ else
+ index = (p / (1000000 / CALCX_ARRSIZE)) - 1;
+
+ if (index < 0)
+ /* p should be 0 unless there is a bug in my code */
+ index = 0;
+
+ if (R == 0)
+ R = 1; /* RTT can't be zero or else divide by zero */
+
+ BUG_ON(index >= CALCX_ARRSIZE);
+
+ if (p >= CALCX_SPLIT)
+ f = calcx_lookup[index][0];
+ else
+ f = calcx_lookup[index][1];
+
+ tmp1 = ((u64)s * 100000000);
+ tmp2 = ((u64)R * (u64)f);
+ do_div(tmp2,10000);
+ do_div(tmp1,tmp2);
+ /* don't alter above math unless you test due to overflow on 32 bit */
+
+ return (u32)tmp1;
+}
+
+/* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */
+static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock *hctx)
+{
+ if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK)
+ return;
+ /* if no feedback spec says t_ipi is 1 second (set elsewhere and then
+ * doubles after every no feedback timer (separate function) */
+
+ if (hctx->ccid3hctx_x < 10) {
+ ccid3_pr_debug("ccid3_calc_new_t_ipi - ccid3hctx_x < 10\n");
+ hctx->ccid3hctx_x = 10;
+ }
+ hctx->ccid3hctx_t_ipi = (hctx->ccid3hctx_s * 100000)
+ / (hctx->ccid3hctx_x / 10);
+ /* reason for above maths with 10 in there is to avoid 32 bit
+ * overflow for jumbo packets */
+
+}
+
+/* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */
+static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx)
+{
+ hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, TFRC_OPSYS_HALF_TIME_GRAN);
+
+}
+
+/*
+ * Update X by
+ * If (p > 0)
+ * x_calc = calcX(s, R, p);
+ * X = max(min(X_calc, 2 * X_recv), s / t_mbi);
+ * Else
+ * If (now - tld >= R)
+ * X = max(min(2 * X, 2 * X_recv), s / R);
+ * tld = now;
+ */
+static void ccid3_hc_tx_update_x(struct sock *sk)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+
+ if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { /* to avoid large error in calcX */
+ hctx->ccid3hctx_x_calc = ccid3_calc_x(hctx->ccid3hctx_s,
+ hctx->ccid3hctx_rtt,
+ hctx->ccid3hctx_p);
+ hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, 2 * hctx->ccid3hctx_x_recv),
+ hctx->ccid3hctx_s / TFRC_MAX_BACK_OFF_TIME);
+ } else if (now_delta(hctx->ccid3hctx_t_ld) >= hctx->ccid3hctx_rtt) {
+ u32 rtt = hctx->ccid3hctx_rtt;
+ if (rtt < 10) {
+ rtt = 10;
+ } /* avoid divide by zero below */
+
+ hctx->ccid3hctx_x = max_t(u32, min_t(u32, 2 * hctx->ccid3hctx_x_recv, 2 * hctx->ccid3hctx_x),
+ (hctx->ccid3hctx_s * 100000) / (rtt / 10));
+ /* Using 100000 and 10 to avoid 32 bit overflow for jumbo frames */
+ do_gettimeofday(&hctx->ccid3hctx_t_ld);
+ }
+
+ if (hctx->ccid3hctx_x == 0) {
+ ccid3_pr_debug("ccid3hctx_x = 0!\n");
+ hctx->ccid3hctx_x = 1;
+ }
+}
+
+static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
+{
+ struct sock *sk = (struct sock *)data;
+ struct dccp_sock *dp = dccp_sk(sk);
+ unsigned long next_tmout = 0;
+ struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+ u32 rtt;
+
+ bh_lock_sock(sk);
+ if (sock_owned_by_user(sk)) {
+ /* Try again later. */
+ /* XXX: set some sensible MIB */
+ sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, jiffies + HZ / 5);
+ goto out;
+ }
+
+ ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk,
+ ccid3_tx_state_name(hctx->ccid3hctx_state));
+
+ if (hctx->ccid3hctx_x < 10) {
+ ccid3_pr_debug("TFRC_SSTATE_NO_FBACK ccid3hctx_x < 10\n");
+ hctx->ccid3hctx_x = 10;
+ }
+
+ switch (hctx->ccid3hctx_state) {
+ case TFRC_SSTATE_TERM:
+ goto out;
+ case TFRC_SSTATE_NO_FBACK:
+ /* Halve send rate */
+ hctx->ccid3hctx_x /= 2;
+ if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / TFRC_MAX_BACK_OFF_TIME))
+ hctx->ccid3hctx_x = hctx->ccid3hctx_s / TFRC_MAX_BACK_OFF_TIME;
+
+ ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d bytes/s\n",
+ dccp_role(sk), sk, ccid3_tx_state_name(hctx->ccid3hctx_state),
+ hctx->ccid3hctx_x);
+ next_tmout = max_t(u32, 2 * (hctx->ccid3hctx_s * 100000)
+ / (hctx->ccid3hctx_x / 10), TFRC_INITIAL_TIMEOUT);
+ /* do above maths with 100000 and 10 to prevent overflow on 32 bit */
+ /* FIXME - not sure above calculation is correct. See section 5 of CCID3 11
+ * should adjust tx_t_ipi and double that to achieve it really */
+ break;
+ case TFRC_SSTATE_FBACK:
+ /* Check if IDLE since last timeout and recv rate is less than 4 packets per RTT */
+ rtt = hctx->ccid3hctx_rtt;
+ if (rtt < 10)
+ rtt = 10;
+ /* stop divide by zero below */
+ if (!hctx->ccid3hctx_idle || (hctx->ccid3hctx_x_recv >=
+ 4 * (hctx->ccid3hctx_s * 100000) / (rtt / 10))) {
+ ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", dccp_role(sk), sk,
+ ccid3_tx_state_name(hctx->ccid3hctx_state));
+ /* Halve sending rate */
+
+ /* If (X_calc > 2 * X_recv)
+ * X_recv = max(X_recv / 2, s / (2 * t_mbi));
+ * Else
+ * X_recv = X_calc / 4;
+ */
+ BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && hctx->ccid3hctx_x_calc == 0);
+
+ /* check also if p is zero -> x_calc is infinity? */
+ if (hctx->ccid3hctx_p < TFRC_SMALLEST_P ||
+ hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv)
+ hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2,
+ hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME));
+ else
+ hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4;
+
+ /* Update sending rate */
+ ccid3_hc_tx_update_x(sk);
+ }
+ if (hctx->ccid3hctx_x == 0) {
+ ccid3_pr_debug("TFRC_SSTATE_FBACK ccid3hctx_x = 0!\n");
+ hctx->ccid3hctx_x = 10;
+ }
+ /* Schedule no feedback timer to expire in max(4 * R, 2 * s / X) */
+ next_tmout = max_t(u32, inet_csk(sk)->icsk_rto,
+ 2 * (hctx->ccid3hctx_s * 100000) / (hctx->ccid3hctx_x / 10));
+ break;
+ default:
+ printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
+ __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
+ dump_stack();
+ goto out;
+ }
+
+ sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
+ jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout)));
+ hctx->ccid3hctx_idle = 1;
+out:
+ bh_unlock_sock(sk);
+ sock_put(sk);
+}
+
+static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb,
+ int len, long *delay)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+ struct ccid3_tx_hist_entry *new_packet = NULL;
+ struct timeval now;
+ int rc = -ENOTCONN;
+
+// ccid3_pr_debug("%s, sk=%p, skb=%p, len=%d\n", dccp_role(sk), sk, skb, len);
+ /*
+ * check if pure ACK or Terminating */
+ /* XXX: We only call this function for DATA and DATAACK, on, these packets can have
+ * zero length, but why the comment about "pure ACK"?
+ */
+ if (hctx == NULL || len == 0 || hctx->ccid3hctx_state == TFRC_SSTATE_TERM)
+ goto out;
+
+ /* See if last packet allocated was not sent */
+ if (!list_empty(&hctx->ccid3hctx_hist))
+ new_packet = list_entry(hctx->ccid3hctx_hist.next,
+ struct ccid3_tx_hist_entry, ccid3htx_node);
+
+ if (new_packet == NULL || new_packet->ccid3htx_sent) {
+ new_packet = ccid3_tx_hist_entry_new(SLAB_ATOMIC);
+
+ rc = -ENOBUFS;
+ if (new_packet == NULL) {
+ ccid3_pr_debug("%s, sk=%p, not enough mem to add "
+ "to history, send refused\n", dccp_role(sk), sk);
+ goto out;
+ }
+
+ list_add(&new_packet->ccid3htx_node, &hctx->ccid3hctx_hist);
+ }
+
+ do_gettimeofday(&now);
+
+ switch (hctx->ccid3hctx_state) {
+ case TFRC_SSTATE_NO_SENT:
+ ccid3_pr_debug("%s, sk=%p, first packet(%llu)\n", dccp_role(sk), sk,
+ dp->dccps_gss);
+
+ hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer;
+ hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk;
+ sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT));
+ hctx->ccid3hctx_last_win_count = 0;
+ hctx->ccid3hctx_t_last_win_count = now;
+ ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK);
+ hctx->ccid3hctx_t_ipi = TFRC_INITIAL_TIMEOUT;
+
+ /* Set nominal send time for initial packet */
+ hctx->ccid3hctx_t_nom = now;
+ (hctx->ccid3hctx_t_nom).tv_usec += hctx->ccid3hctx_t_ipi;
+ timeval_fix(&(hctx->ccid3hctx_t_nom));
+ ccid3_calc_new_delta(hctx);
+ rc = 0;
+ break;
+ case TFRC_SSTATE_NO_FBACK:
+ case TFRC_SSTATE_FBACK:
+ *delay = (now_delta(hctx->ccid3hctx_t_nom) - hctx->ccid3hctx_delta);
+ ccid3_pr_debug("send_packet delay=%ld\n",*delay);
+ *delay /= -1000;
+ /* divide by -1000 is to convert to ms and get sign right */
+ rc = *delay > 0 ? -EAGAIN : 0;
+ break;
+ default:
+ printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
+ __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
+ dump_stack();
+ rc = -EINVAL;
+ break;
+ }
+
+ /* Can we send? if so add options and add to packet history */
+ if (rc == 0)
+ new_packet->ccid3htx_win_count = DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count;
+out:
+ return rc;
+}
+
+static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+ struct ccid3_tx_hist_entry *packet = NULL;
+ struct timeval now;
+
+// ccid3_pr_debug("%s, sk=%p, more=%d, len=%d\n", dccp_role(sk), sk, more, len);
+ BUG_ON(hctx == NULL);
+
+ if (hctx->ccid3hctx_state == TFRC_SSTATE_TERM) {
+ ccid3_pr_debug("%s, sk=%p, while state is TFRC_SSTATE_TERM!\n",
+ dccp_role(sk), sk);
+ return;
+ }
+
+ do_gettimeofday(&now);
+
+ /* check if we have sent a data packet */
+ if (len > 0) {
+ unsigned long quarter_rtt;
+
+ if (list_empty(&hctx->ccid3hctx_hist)) {
+ printk(KERN_CRIT "%s: packet doesn't exists in history!\n", __FUNCTION__);
+ return;
+ }
+ packet = list_entry(hctx->ccid3hctx_hist.next, struct ccid3_tx_hist_entry, ccid3htx_node);
+ if (packet->ccid3htx_sent) {
+ printk(KERN_CRIT "%s: no unsent packet in history!\n", __FUNCTION__);
+ return;
+ }
+ packet->ccid3htx_tstamp = now;
+ packet->ccid3htx_seqno = dp->dccps_gss;
+ // ccid3_pr_debug("%s, sk=%p, seqno=%llu inserted!\n", dccp_role(sk), sk, packet->ccid3htx_seqno);
+
+ /*
+ * Check if win_count have changed */
+ /* COMPLIANCE_BEGIN
+ * Algorithm in "8.1. Window Counter Valuer" in draft-ietf-dccp-ccid3-11.txt
+ */
+ quarter_rtt = now_delta(hctx->ccid3hctx_t_last_win_count) / (hctx->ccid3hctx_rtt / 4);
+ if (quarter_rtt > 0) {
+ hctx->ccid3hctx_t_last_win_count = now;
+ hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count +
+ min_t(unsigned long, quarter_rtt, 5)) % 16;
+ ccid3_pr_debug("%s, sk=%p, window changed from %u to %u!\n",
+ dccp_role(sk), sk,
+ packet->ccid3htx_win_count,
+ hctx->ccid3hctx_last_win_count);
+ }
+ /* COMPLIANCE_END */
+#if 0
+ ccid3_pr_debug("%s, sk=%p, packet sent (%llu,%u)\n",
+ dccp_role(sk), sk,
+ packet->ccid3htx_seqno,
+ packet->ccid3htx_win_count);
+#endif
+ hctx->ccid3hctx_idle = 0;
+ packet->ccid3htx_sent = 1;
+ } else
+ ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n",
+ dccp_role(sk), sk, dp->dccps_gss);
+
+ switch (hctx->ccid3hctx_state) {
+ case TFRC_SSTATE_NO_SENT:
+ /* if first wasn't pure ack */
+ if (len != 0)
+ printk(KERN_CRIT "%s: %s, First packet sent is noted as a data packet\n",
+ __FUNCTION__, dccp_role(sk));
+ return;
+ case TFRC_SSTATE_NO_FBACK:
+ case TFRC_SSTATE_FBACK:
+ if (len > 0) {
+ hctx->ccid3hctx_t_nom = now;
+ ccid3_calc_new_t_ipi(hctx);
+ ccid3_calc_new_delta(hctx);
+ (hctx->ccid3hctx_t_nom).tv_usec += hctx->ccid3hctx_t_ipi;
+ timeval_fix(&(hctx->ccid3hctx_t_nom));
+ }
+ break;
+ default:
+ printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
+ __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
+ dump_stack();
+ break;
+ }
+}
+
+static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+ struct ccid3_options_received *opt_recv;
+ struct ccid3_tx_hist_entry *entry, *next, *packet;
+ unsigned long next_tmout;
+ u16 t_elapsed;
+ u32 pinv;
+ u32 x_recv;
+ u32 r_sample;
+#if 0
+ ccid3_pr_debug("%s, sk=%p(%s), skb=%p(%s)\n",
+ dccp_role(sk), sk, dccp_state_name(sk->sk_state),
+ skb, dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
+#endif
+ if (hctx == NULL)
+ return;
+
+ if (hctx->ccid3hctx_state == TFRC_SSTATE_TERM) {
+ ccid3_pr_debug("%s, sk=%p, received a packet when terminating!\n", dccp_role(sk), sk);
+ return;
+ }
+
+ /* we are only interested in ACKs */
+ if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK ||
+ DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK))
+ return;
+
+ opt_recv = &hctx->ccid3hctx_options_received;
+
+ t_elapsed = dp->dccps_options_received.dccpor_elapsed_time;
+ x_recv = opt_recv->ccid3or_receive_rate;
+ pinv = opt_recv->ccid3or_loss_event_rate;
+
+ switch (hctx->ccid3hctx_state) {
+ case TFRC_SSTATE_NO_SENT:
+ /* FIXME: what to do here? */
+ return;
+ case TFRC_SSTATE_NO_FBACK:
+ case TFRC_SSTATE_FBACK:
+ /* Calculate new round trip sample by
+ * R_sample = (now - t_recvdata) - t_delay */
+ /* get t_recvdata from history */
+ packet = NULL;
+ list_for_each_entry_safe(entry, next, &hctx->ccid3hctx_hist, ccid3htx_node)
+ if (entry->ccid3htx_seqno == DCCP_SKB_CB(skb)->dccpd_ack_seq) {
+ packet = entry;
+ break;
+ }
+
+ if (packet == NULL) {
+ ccid3_pr_debug("%s, sk=%p, seqno %llu(%s) does't exist in history!\n",
+ dccp_role(sk), sk, DCCP_SKB_CB(skb)->dccpd_ack_seq,
+ dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
+ return;
+ }
+
+ /* Update RTT */
+ r_sample = now_delta(packet->ccid3htx_tstamp);
+ /* FIXME: */
+ // r_sample -= usecs_to_jiffies(t_elapsed * 10);
+
+ /* Update RTT estimate by
+ * If (No feedback recv)
+ * R = R_sample;
+ * Else
+ * R = q * R + (1 - q) * R_sample;
+ *
+ * q is a constant, RFC 3448 recomments 0.9
+ */
+ if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) {
+ ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK);
+ hctx->ccid3hctx_rtt = r_sample;
+ } else
+ hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + r_sample / 10;
+
+ /*
+ * XXX: this is to avoid a division by zero in ccid3_hc_tx_packet_sent
+ * implemention of the new window count.
+ */
+ if (hctx->ccid3hctx_rtt < 4)
+ hctx->ccid3hctx_rtt = 4;
+
+ ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, r_sample=%us\n",
+ dccp_role(sk), sk,
+ hctx->ccid3hctx_rtt,
+ r_sample);
+
+ /* Update timeout interval */
+ inet_csk(sk)->icsk_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, USEC_IN_SEC);
+
+ /* Update receive rate */
+ hctx->ccid3hctx_x_recv = x_recv; /* x_recv in bytes per second */
+
+ /* Update loss event rate */
+ if (pinv == ~0 || pinv == 0)
+ hctx->ccid3hctx_p = 0;
+ else {
+ hctx->ccid3hctx_p = 1000000 / pinv;
+
+ if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) {
+ hctx->ccid3hctx_p = TFRC_SMALLEST_P;
+ ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", dccp_role(sk), sk);
+ }
+ }
+
+ /* unschedule no feedback timer */
+ sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
+
+ /* Update sending rate */
+ ccid3_hc_tx_update_x(sk);
+
+ /* Update next send time */
+ if (hctx->ccid3hctx_t_ipi > (hctx->ccid3hctx_t_nom).tv_usec) {
+ (hctx->ccid3hctx_t_nom).tv_usec += USEC_IN_SEC;
+ (hctx->ccid3hctx_t_nom).tv_sec--;
+ }
+ /* FIXME - if no feedback then t_ipi can go > 1 second */
+ (hctx->ccid3hctx_t_nom).tv_usec -= hctx->ccid3hctx_t_ipi;
+ ccid3_calc_new_t_ipi(hctx);
+ (hctx->ccid3hctx_t_nom).tv_usec += hctx->ccid3hctx_t_ipi;
+ timeval_fix(&(hctx->ccid3hctx_t_nom));
+ ccid3_calc_new_delta(hctx);
+
+ /* remove all packets older than the one acked from history */
+#if 0
+ FIXME!
+ list_for_each_entry_safe_continue(entry, next, &hctx->ccid3hctx_hist, ccid3htx_node) {
+ list_del_init(&entry->ccid3htx_node);
+ ccid3_tx_hist_entry_delete(entry);
+ }
+#endif
+ if (hctx->ccid3hctx_x < 10) {
+ ccid3_pr_debug("ccid3_hc_tx_packet_recv hctx->ccid3hctx_x < 10\n");
+ hctx->ccid3hctx_x = 10;
+ }
+ /* to prevent divide by zero below */
+
+ /* Schedule no feedback timer to expire in max(4 * R, 2 * s / X) */
+ next_tmout = max(inet_csk(sk)->icsk_rto,
+ 2 * (hctx->ccid3hctx_s * 100000) / (hctx->ccid3hctx_x/10));
+ /* maths with 100000 and 10 is to prevent overflow with 32 bit */
+
+ ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to expire in %lu jiffies (%luus)\n",
+ dccp_role(sk), sk, usecs_to_jiffies(next_tmout), next_tmout);
+
+ sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
+ jiffies + max_t(u32,1,usecs_to_jiffies(next_tmout)));
+
+ /* set idle flag */
+ hctx->ccid3hctx_idle = 1;
+ break;
+ default:
+ printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
+ __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
+ dump_stack();
+ break;
+ }
+}
+
+static void ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb)
+{
+ const struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+
+ if (hctx == NULL || !(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN))
+ return;
+
+ DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count;
+}
+
+static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
+ unsigned char len, u16 idx, unsigned char *value)
+{
+ int rc = 0;
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+ struct ccid3_options_received *opt_recv;
+
+ if (hctx == NULL)
+ return 0;
+
+ opt_recv = &hctx->ccid3hctx_options_received;
+
+ if (opt_recv->ccid3or_seqno != dp->dccps_gsr) {
+ opt_recv->ccid3or_seqno = dp->dccps_gsr;
+ opt_recv->ccid3or_loss_event_rate = ~0;
+ opt_recv->ccid3or_loss_intervals_idx = 0;
+ opt_recv->ccid3or_loss_intervals_len = 0;
+ opt_recv->ccid3or_receive_rate = 0;
+ }
+
+ switch (option) {
+ case TFRC_OPT_LOSS_EVENT_RATE:
+ if (len != 4) {
+ ccid3_pr_debug("%s, sk=%p, invalid len for TFRC_OPT_LOSS_EVENT_RATE\n",
+ dccp_role(sk), sk);
+ rc = -EINVAL;
+ } else {
+ opt_recv->ccid3or_loss_event_rate = ntohl(*(u32 *)value);
+ ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n",
+ dccp_role(sk), sk,
+ opt_recv->ccid3or_loss_event_rate);
+ }
+ break;
+ case TFRC_OPT_LOSS_INTERVALS:
+ opt_recv->ccid3or_loss_intervals_idx = idx;
+ opt_recv->ccid3or_loss_intervals_len = len;
+ ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n",
+ dccp_role(sk), sk,
+ opt_recv->ccid3or_loss_intervals_idx,
+ opt_recv->ccid3or_loss_intervals_len);
+ break;
+ case TFRC_OPT_RECEIVE_RATE:
+ if (len != 4) {
+ ccid3_pr_debug("%s, sk=%p, invalid len for TFRC_OPT_RECEIVE_RATE\n",
+ dccp_role(sk), sk);
+ rc = -EINVAL;
+ } else {
+ opt_recv->ccid3or_receive_rate = ntohl(*(u32 *)value);
+ ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n",
+ dccp_role(sk), sk,
+ opt_recv->ccid3or_receive_rate);
+ }
+ break;
+ }
+
+ return rc;
+}
+
+static int ccid3_hc_tx_init(struct sock *sk)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_tx_sock *hctx;
+
+ ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
+
+ hctx = dp->dccps_hc_tx_ccid_private = kmalloc(sizeof(*hctx), gfp_any());
+ if (hctx == NULL)
+ return -ENOMEM;
+
+ memset(hctx, 0, sizeof(*hctx));
+
+ if (dp->dccps_avg_packet_size >= TFRC_MIN_PACKET_SIZE &&
+ dp->dccps_avg_packet_size <= TFRC_MAX_PACKET_SIZE)
+ hctx->ccid3hctx_s = (u16)dp->dccps_avg_packet_size;
+ else
+ hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE;
+
+ hctx->ccid3hctx_x = hctx->ccid3hctx_s; /* set transmission rate to 1 packet per second */
+ hctx->ccid3hctx_rtt = 4; /* See ccid3_hc_tx_packet_sent win_count calculatation */
+ inet_csk(sk)->icsk_rto = USEC_IN_SEC;
+ hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT;
+ INIT_LIST_HEAD(&hctx->ccid3hctx_hist);
+ init_timer(&hctx->ccid3hctx_no_feedback_timer);
+
+ return 0;
+}
+
+static void ccid3_hc_tx_exit(struct sock *sk)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+ struct ccid3_tx_hist_entry *entry, *next;
+
+ ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
+ BUG_ON(hctx == NULL);
+
+ ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM);
+ sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
+
+ /* Empty packet history */
+ list_for_each_entry_safe(entry, next, &hctx->ccid3hctx_hist, ccid3htx_node) {
+ list_del_init(&entry->ccid3htx_node);
+ ccid3_tx_hist_entry_delete(entry);
+ }
+
+ kfree(dp->dccps_hc_tx_ccid_private);
+ dp->dccps_hc_tx_ccid_private = NULL;
+}
+
+/*
+ * RX Half Connection methods
+ */
+
+/* TFRC receiver states */
+enum ccid3_hc_rx_states {
+ TFRC_RSTATE_NO_DATA = 1,
+ TFRC_RSTATE_DATA,
+ TFRC_RSTATE_TERM = 127,
+};
+
+#ifdef CCID3_DEBUG
+static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state)
+{
+ static char *ccid3_rx_state_names[] = {
+ [TFRC_RSTATE_NO_DATA] = "NO_DATA",
+ [TFRC_RSTATE_DATA] = "DATA",
+ [TFRC_RSTATE_TERM] = "TERM",
+ };
+
+ return ccid3_rx_state_names[state];
+}
+#endif
+
+static inline void ccid3_hc_rx_set_state(struct sock *sk, enum ccid3_hc_rx_states state)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+ enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state;
+
+ ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
+ dccp_role(sk), sk, ccid3_rx_state_name(oldstate), ccid3_rx_state_name(state));
+ WARN_ON(state == oldstate);
+ hcrx->ccid3hcrx_state = state;
+}
+
+static int ccid3_hc_rx_add_hist(struct sock *sk, struct ccid3_rx_hist_entry *packet)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+ struct ccid3_rx_hist_entry *entry, *next;
+ u8 num_later = 0;
+
+ if (list_empty(&hcrx->ccid3hcrx_hist))
+ list_add(&packet->ccid3hrx_node, &hcrx->ccid3hcrx_hist);
+ else {
+ u64 seqno = packet->ccid3hrx_seqno;
+ struct ccid3_rx_hist_entry *iter = list_entry(hcrx->ccid3hcrx_hist.next,
+ struct ccid3_rx_hist_entry,
+ ccid3hrx_node);
+ if (after48(seqno, iter->ccid3hrx_seqno))
+ list_add(&packet->ccid3hrx_node, &hcrx->ccid3hcrx_hist);
+ else {
+ if (iter->ccid3hrx_type == DCCP_PKT_DATA ||
+ iter->ccid3hrx_type == DCCP_PKT_DATAACK)
+ num_later = 1;
+
+ list_for_each_entry_continue(iter, &hcrx->ccid3hcrx_hist, ccid3hrx_node) {
+ if (after48(seqno, iter->ccid3hrx_seqno)) {
+ list_add(&packet->ccid3hrx_node, &iter->ccid3hrx_node);
+ goto trim_history;
+ }
+
+ if (iter->ccid3hrx_type == DCCP_PKT_DATA ||
+ iter->ccid3hrx_type == DCCP_PKT_DATAACK)
+ num_later++;
+
+ if (num_later == TFRC_RECV_NUM_LATE_LOSS) {
+ ccid3_rx_hist_entry_delete(packet);
+ ccid3_pr_debug("%s, sk=%p, packet(%llu) already lost!\n",
+ dccp_role(sk), sk, seqno);
+ return 1;
+ }
+ }
+
+ if (num_later < TFRC_RECV_NUM_LATE_LOSS)
+ list_add_tail(&packet->ccid3hrx_node, &hcrx->ccid3hcrx_hist);
+ /* FIXME: else what? should we destroy the packet like above? */
+ }
+ }
+
+trim_history:
+ /* Trim history (remove all packets after the NUM_LATE_LOSS + 1 data packets) */
+ num_later = TFRC_RECV_NUM_LATE_LOSS + 1;
+
+ if (!list_empty(&hcrx->ccid3hcrx_loss_interval_hist)) {
+ list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, ccid3hrx_node) {
+ if (num_later == 0) {
+ list_del_init(&entry->ccid3hrx_node);
+ ccid3_rx_hist_entry_delete(entry);
+ } else if (entry->ccid3hrx_type == DCCP_PKT_DATA ||
+ entry->ccid3hrx_type == DCCP_PKT_DATAACK)
+ --num_later;
+ }
+ } else {
+ int step = 0;
+ u8 win_count = 0; /* Not needed, but lets shut up gcc */
+ int tmp;
+ /*
+ * We have no loss interval history so we need at least one
+ * rtt:s of data packets to approximate rtt.
+ */
+ list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, ccid3hrx_node) {
+ if (num_later == 0) {
+ switch (step) {
+ case 0:
+ step = 1;
+ /* OK, find next data packet */
+ num_later = 1;
+ break;
+ case 1:
+ step = 2;
+ /* OK, find next data packet */
+ num_later = 1;
+ win_count = entry->ccid3hrx_win_count;
+ break;
+ case 2:
+ tmp = win_count - entry->ccid3hrx_win_count;
+ if (tmp < 0)
+ tmp += TFRC_WIN_COUNT_LIMIT;
+ if (tmp > TFRC_WIN_COUNT_PER_RTT + 1) {
+ /* we have found a packet older than one rtt
+ * remove the rest */
+ step = 3;
+ } else /* OK, find next data packet */
+ num_later = 1;
+ break;
+ case 3:
+ list_del_init(&entry->ccid3hrx_node);
+ ccid3_rx_hist_entry_delete(entry);
+ break;
+ }
+ } else if (entry->ccid3hrx_type == DCCP_PKT_DATA ||
+ entry->ccid3hrx_type == DCCP_PKT_DATAACK)
+ --num_later;
+ }
+ }
+
+ return 0;
+}
+
+static void ccid3_hc_rx_send_feedback(struct sock *sk)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+ struct ccid3_rx_hist_entry *entry, *packet;
+
+ ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
+
+ switch (hcrx->ccid3hcrx_state) {
+ case TFRC_RSTATE_NO_DATA:
+ hcrx->ccid3hcrx_x_recv = 0;
+ break;
+ case TFRC_RSTATE_DATA: {
+ u32 delta = now_delta(hcrx->ccid3hcrx_tstamp_last_feedback);
+
+ if (delta == 0)
+ delta = 1; /* to prevent divide by zero */
+ hcrx->ccid3hcrx_x_recv = (hcrx->ccid3hcrx_bytes_recv * USEC_IN_SEC) / delta;
+ }
+ break;
+ default:
+ printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
+ __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state);
+ dump_stack();
+ return;
+ }
+
+ packet = NULL;
+ list_for_each_entry(entry, &hcrx->ccid3hcrx_hist, ccid3hrx_node)
+ if (entry->ccid3hrx_type == DCCP_PKT_DATA ||
+ entry->ccid3hrx_type == DCCP_PKT_DATAACK) {
+ packet = entry;
+ break;
+ }
+
+ if (packet == NULL) {
+ printk(KERN_CRIT "%s: %s, sk=%p, no data packet in history!\n",
+ __FUNCTION__, dccp_role(sk), sk);
+ dump_stack();
+ return;
+ }
+
+ do_gettimeofday(&(hcrx->ccid3hcrx_tstamp_last_feedback));
+ hcrx->ccid3hcrx_last_counter = packet->ccid3hrx_win_count;
+ hcrx->ccid3hcrx_seqno_last_counter = packet->ccid3hrx_seqno;
+ hcrx->ccid3hcrx_bytes_recv = 0;
+
+ /* Convert to multiples of 10us */
+ hcrx->ccid3hcrx_elapsed_time = now_delta(packet->ccid3hrx_tstamp) / 10;
+ if (hcrx->ccid3hcrx_p == 0)
+ hcrx->ccid3hcrx_pinv = ~0;
+ else
+ hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p;
+ dccp_send_ack(sk);
+}
+
+static void ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
+{
+ const struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+
+ if (hcrx == NULL || !(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN))
+ return;
+
+ if (hcrx->ccid3hcrx_elapsed_time != 0 && !dccp_packet_without_ack(skb))
+ dccp_insert_option_elapsed_time(sk, skb, hcrx->ccid3hcrx_elapsed_time);
+
+ if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA) {
+ const u32 x_recv = htonl(hcrx->ccid3hcrx_x_recv);
+ const u32 pinv = htonl(hcrx->ccid3hcrx_pinv);
+
+ dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, &pinv, sizeof(pinv));
+ dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, &x_recv, sizeof(x_recv));
+ }
+
+ DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_last_counter;
+}
+
+/* Weights used to calculate loss event rate */
+/*
+ * These are integers as per section 8 of RFC3448. We can then divide by 4 *
+ * when we use it.
+ */
+const int ccid3_hc_rx_w[TFRC_RECV_IVAL_F_LENGTH] = { 4, 4, 4, 4, 3, 2, 1, 1, };
+
+/*
+ * args: fvalue - function value to match
+ * returns: p closest to that value
+ *
+ * both fvalue and p are multiplied by 1,000,000 to use ints
+ */
+u32 calcx_reverse_lookup(u32 fvalue) {
+ int ctr = 0;
+ int small;
+
+ if (fvalue < calcx_lookup[0][1])
+ return 0;
+ if (fvalue <= calcx_lookup[CALCX_ARRSIZE-1][1])
+ small = 1;
+ else if (fvalue > calcx_lookup[CALCX_ARRSIZE-1][0])
+ return 1000000;
+ else
+ small = 0;
+ while (fvalue > calcx_lookup[ctr][small])
+ ctr++;
+ if (small)
+ return (CALCX_SPLIT * ctr / CALCX_ARRSIZE);
+ else
+ return (1000000 * ctr / CALCX_ARRSIZE) ;
+}
+
+/* calculate first loss interval
+ *
+ * returns estimated loss interval in usecs */
+
+static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+ struct ccid3_rx_hist_entry *entry, *next, *tail = NULL;
+ u32 rtt, delta, x_recv, fval, p, tmp2;
+ struct timeval tstamp, tmp_tv;
+ int interval = 0;
+ int win_count = 0;
+ int step = 0;
+ u64 tmp1;
+
+ list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, ccid3hrx_node) {
+ if (entry->ccid3hrx_type == DCCP_PKT_DATA ||
+ entry->ccid3hrx_type == DCCP_PKT_DATAACK) {
+ tail = entry;
+
+ switch (step) {
+ case 0:
+ tstamp = entry->ccid3hrx_tstamp;
+ win_count = entry->ccid3hrx_win_count;
+ step = 1;
+ break;
+ case 1:
+ interval = win_count - entry->ccid3hrx_win_count;
+ if (interval < 0)
+ interval += TFRC_WIN_COUNT_LIMIT;
+ if (interval > 4)
+ goto found;
+ break;
+ }
+ }
+ }
+
+ if (step == 0) {
+ printk(KERN_CRIT "%s: %s, sk=%p, packet history contains no data packets!\n",
+ __FUNCTION__, dccp_role(sk), sk);
+ return ~0;
+ }
+
+ if (interval == 0) {
+ ccid3_pr_debug("%s, sk=%p, Could not find a win_count interval > 0. Defaulting to 1\n",
+ dccp_role(sk), sk);
+ interval = 1;
+ }
+found:
+ timeval_sub(tstamp,tail->ccid3hrx_tstamp,&tmp_tv);
+ rtt = (tmp_tv.tv_sec * USEC_IN_SEC + tmp_tv.tv_usec) * 4 / interval;
+ ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n",
+ dccp_role(sk), sk, rtt);
+ if (rtt == 0)
+ rtt = 1;
+
+ delta = now_delta(hcrx->ccid3hcrx_tstamp_last_feedback);
+ if (delta == 0)
+ delta = 1;
+
+ x_recv = (hcrx->ccid3hcrx_bytes_recv * USEC_IN_SEC) / delta;
+
+ tmp1 = (u64)x_recv * (u64)rtt;
+ do_div(tmp1,10000000);
+ tmp2 = (u32)tmp1;
+ fval = (hcrx->ccid3hcrx_s * 100000) / tmp2;
+ /* do not alter order above or you will get overflow on 32 bit */
+ p = calcx_reverse_lookup(fval);
+ ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied loss rate=%u\n",\
+ dccp_role(sk), sk, x_recv, p);
+
+ if (p == 0)
+ return ~0;
+ else
+ return 1000000 / p;
+}
+
+static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+ struct ccid3_loss_interval_hist_entry *li_entry;
+
+ if (seq_loss != DCCP_MAX_SEQNO + 1) {
+ ccid3_pr_debug("%s, sk=%p, seq_loss=%llu, win_loss=%u, packet loss detected\n",
+ dccp_role(sk), sk, seq_loss, win_loss);
+
+ if (list_empty(&hcrx->ccid3hcrx_loss_interval_hist)) {
+ struct ccid3_loss_interval_hist_entry *li_tail = NULL;
+ int i;
+
+ ccid3_pr_debug("%s, sk=%p, first loss event detected, creating history\n", dccp_role(sk), sk);
+ for (i = 0; i <= TFRC_RECV_IVAL_F_LENGTH; ++i) {
+ li_entry = ccid3_loss_interval_hist_entry_new(SLAB_ATOMIC);
+ if (li_entry == NULL) {
+ ccid3_loss_interval_history_delete(&hcrx->ccid3hcrx_loss_interval_hist);
+ ccid3_pr_debug("%s, sk=%p, not enough mem for creating history\n",
+ dccp_role(sk), sk);
+ return;
+ }
+ if (li_tail == NULL)
+ li_tail = li_entry;
+ list_add(&li_entry->ccid3lih_node, &hcrx->ccid3hcrx_loss_interval_hist);
+ }
+
+ li_entry->ccid3lih_seqno = seq_loss;
+ li_entry->ccid3lih_win_count = win_loss;
+
+ li_tail->ccid3lih_interval = ccid3_hc_rx_calc_first_li(sk);
+ }
+ }
+ /* FIXME: find end of interval */
+}
+
+static void ccid3_hc_rx_detect_loss(struct sock *sk)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+ struct ccid3_rx_hist_entry *entry, *a_next, *b_next, *packet;
+ struct ccid3_rx_hist_entry *a_loss = NULL;
+ struct ccid3_rx_hist_entry *b_loss = NULL;
+ u64 seq_loss = DCCP_MAX_SEQNO + 1;
+ u8 win_loss = 0;
+ u8 num_later = TFRC_RECV_NUM_LATE_LOSS;
+
+ list_for_each_entry_safe(entry, b_next, &hcrx->ccid3hcrx_hist, ccid3hrx_node) {
+ if (num_later == 0) {
+ b_loss = entry;
+ break;
+ } else if (entry->ccid3hrx_type == DCCP_PKT_DATA ||
+ entry->ccid3hrx_type == DCCP_PKT_DATAACK)
+ --num_later;
+ }
+
+ if (b_loss == NULL)
+ goto out_update_li;
+
+ a_next = b_next;
+ num_later = 1;
+#if 0
+ FIXME MERGE GIT!
+ list_for_each_entry_safe_continue(entry, a_next, &hcrx->ccid3hcrx_hist, ccid3hrx_node) {
+ if (num_later == 0) {
+ a_loss = entry;
+ break;
+ } else if (entry->ccid3hrx_type == DCCP_PKT_DATA ||
+ entry->ccid3hrx_type == DCCP_PKT_DATAACK)
+ --num_later;
+ }
+#endif
+
+ if (a_loss == NULL) {
+ if (list_empty(&hcrx->ccid3hcrx_loss_interval_hist)) {
+ /* no loss event have occured yet */
+ ccid3_pr_debug("%s, sk=%p, TODO: find a lost data "
+ "packet by comparing to initial seqno\n",
+ dccp_role(sk), sk);
+ goto out_update_li;
+ } else {
+ pr_info("%s: %s, sk=%p, ERROR! Less than 4 data packets in history",
+ __FUNCTION__, dccp_role(sk), sk);
+ return;
+ }
+ }
+
+ /* Locate a lost data packet */
+ entry = packet = b_loss;
+#if 0
+ FIXME MERGE GIT!
+ list_for_each_entry_safe_continue(entry, b_next, &hcrx->ccid3hcrx_hist, ccid3hrx_node) {
+ u64 delta = dccp_delta_seqno(entry->ccid3hrx_seqno, packet->ccid3hrx_seqno);
+
+ if (delta != 0) {
+ if (packet->ccid3hrx_type == DCCP_PKT_DATA ||
+ packet->ccid3hrx_type == DCCP_PKT_DATAACK)
+ --delta;
+ /*
+ * FIXME: check this, probably this % usage is because
+ * in earlier drafts the ndp count was just 8 bits
+ * long, but now it cam be up to 24 bits long.
+ */
+#if 0
+ if (delta % DCCP_NDP_LIMIT !=
+ (packet->ccid3hrx_ndp - entry->ccid3hrx_ndp) % DCCP_NDP_LIMIT)
+#endif
+ if (delta != packet->ccid3hrx_ndp - entry->ccid3hrx_ndp) {
+ seq_loss = entry->ccid3hrx_seqno;
+ dccp_inc_seqno(&seq_loss);
+ }
+ }
+ packet = entry;
+ if (packet == a_loss)
+ break;
+ }
+#endif
+
+ if (seq_loss != DCCP_MAX_SEQNO + 1)
+ win_loss = a_loss->ccid3hrx_win_count;
+
+out_update_li:
+ ccid3_hc_rx_update_li(sk, seq_loss, win_loss);
+}
+
+static u32 ccid3_hc_rx_calc_i_mean(struct sock *sk)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+ struct ccid3_loss_interval_hist_entry *li_entry, *li_next;
+ int i = 0;
+ u32 i_tot;
+ u32 i_tot0 = 0;
+ u32 i_tot1 = 0;
+ u32 w_tot = 0;
+
+ list_for_each_entry_safe(li_entry, li_next, &hcrx->ccid3hcrx_loss_interval_hist, ccid3lih_node) {
+ if (i < TFRC_RECV_IVAL_F_LENGTH) {
+ i_tot0 += li_entry->ccid3lih_interval * ccid3_hc_rx_w[i];
+ w_tot += ccid3_hc_rx_w[i];
+ }
+
+ if (i != 0)
+ i_tot1 += li_entry->ccid3lih_interval * ccid3_hc_rx_w[i - 1];
+
+ if (++i > TFRC_RECV_IVAL_F_LENGTH)
+ break;
+ }
+
+ if (i != TFRC_RECV_IVAL_F_LENGTH) {
+ pr_info("%s: %s, sk=%p, ERROR! Missing entry in interval history!\n",
+ __FUNCTION__, dccp_role(sk), sk);
+ return 0;
+ }
+
+ i_tot = max(i_tot0, i_tot1);
+
+ /* FIXME: Why do we do this? -Ian McDonald */
+ if (i_tot * 4 < w_tot)
+ i_tot = w_tot * 4;
+
+ return i_tot * 4 / w_tot;
+}
+
+static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+ struct ccid3_rx_hist_entry *packet;
+ struct timeval now;
+ u8 win_count;
+ u32 p_prev;
+ int ins;
+#if 0
+ ccid3_pr_debug("%s, sk=%p(%s), skb=%p(%s)\n",
+ dccp_role(sk), sk, dccp_state_name(sk->sk_state),
+ skb, dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
+#endif
+ if (hcrx == NULL)
+ return;
+
+ BUG_ON(!(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA ||
+ hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA));
+
+ switch (DCCP_SKB_CB(skb)->dccpd_type) {
+ case DCCP_PKT_ACK:
+ if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
+ return;
+ case DCCP_PKT_DATAACK:
+ if (dp->dccps_options_received.dccpor_timestamp_echo == 0)
+ break;
+ p_prev = hcrx->ccid3hcrx_rtt;
+ do_gettimeofday(&now);
+ /* hcrx->ccid3hcrx_rtt = now - dp->dccps_options_received.dccpor_timestamp_echo -
+ usecs_to_jiffies(dp->dccps_options_received.dccpor_elapsed_time * 10);
+ FIXME - I think above code is broken - have to look at options more, will also need
+ to fix pr_debug below */
+ if (p_prev != hcrx->ccid3hcrx_rtt)
+ ccid3_pr_debug("%s, sk=%p, New RTT estimate=%lu jiffies, tstamp_echo=%u, elapsed time=%u\n",
+ dccp_role(sk), sk, hcrx->ccid3hcrx_rtt,
+ dp->dccps_options_received.dccpor_timestamp_echo,
+ dp->dccps_options_received.dccpor_elapsed_time);
+ break;
+ case DCCP_PKT_DATA:
+ break;
+ default:
+ ccid3_pr_debug("%s, sk=%p, not DATA/DATAACK/ACK packet(%s)\n",
+ dccp_role(sk), sk,
+ dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
+ return;
+ }
+
+ packet = ccid3_rx_hist_entry_new(sk, skb, SLAB_ATOMIC);
+ if (packet == NULL) {
+ ccid3_pr_debug("%s, sk=%p, Not enough mem to add rx packet to history (consider it lost)!",
+ dccp_role(sk), sk);
+ return;
+ }
+
+ win_count = packet->ccid3hrx_win_count;
+
+ ins = ccid3_hc_rx_add_hist(sk, packet);
+
+ if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK)
+ return;
+
+ switch (hcrx->ccid3hcrx_state) {
+ case TFRC_RSTATE_NO_DATA:
+ ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial feedback\n",
+ dccp_role(sk), sk, dccp_state_name(sk->sk_state), skb);
+ ccid3_hc_rx_send_feedback(sk);
+ ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA);
+ return;
+ case TFRC_RSTATE_DATA:
+ hcrx->ccid3hcrx_bytes_recv += skb->len - dccp_hdr(skb)->dccph_doff * 4;
+ if (ins == 0) {
+ do_gettimeofday(&now);
+ if ((now_delta(hcrx->ccid3hcrx_tstamp_last_ack)) >= hcrx->ccid3hcrx_rtt) {
+ hcrx->ccid3hcrx_tstamp_last_ack = now;
+ ccid3_hc_rx_send_feedback(sk);
+ }
+ return;
+ }
+ break;
+ default:
+ printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
+ __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state);
+ dump_stack();
+ return;
+ }
+
+ /* Dealing with packet loss */
+ ccid3_pr_debug("%s, sk=%p(%s), skb=%p, data loss! Reacting...\n",
+ dccp_role(sk), sk, dccp_state_name(sk->sk_state), skb);
+
+ ccid3_hc_rx_detect_loss(sk);
+ p_prev = hcrx->ccid3hcrx_p;
+
+ /* Calculate loss event rate */
+ if (!list_empty(&hcrx->ccid3hcrx_loss_interval_hist))
+ /* Scaling up by 1000000 as fixed decimal */
+ hcrx->ccid3hcrx_p = 1000000 / ccid3_hc_rx_calc_i_mean(sk);
+
+ if (hcrx->ccid3hcrx_p > p_prev) {
+ ccid3_hc_rx_send_feedback(sk);
+ return;
+ }
+}
+
+static int ccid3_hc_rx_init(struct sock *sk)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_rx_sock *hcrx;
+
+ ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
+
+ hcrx = dp->dccps_hc_rx_ccid_private = kmalloc(sizeof(*hcrx), gfp_any());
+ if (hcrx == NULL)
+ return -ENOMEM;
+
+ memset(hcrx, 0, sizeof(*hcrx));
+
+ if (dp->dccps_avg_packet_size >= TFRC_MIN_PACKET_SIZE &&
+ dp->dccps_avg_packet_size <= TFRC_MAX_PACKET_SIZE)
+ hcrx->ccid3hcrx_s = (u16)dp->dccps_avg_packet_size;
+ else
+ hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE;
+
+ hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA;
+ INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist);
+ INIT_LIST_HEAD(&hcrx->ccid3hcrx_loss_interval_hist);
+
+ return 0;
+}
+
+static void ccid3_hc_rx_exit(struct sock *sk)
+{
+ struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+
+ ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
+
+ if (hcrx == NULL)
+ return;
+
+ ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM);
+
+ /* Empty packet history */
+ ccid3_rx_history_delete(&hcrx->ccid3hcrx_hist);
+
+ /* Empty loss interval history */
+ ccid3_loss_interval_history_delete(&hcrx->ccid3hcrx_loss_interval_hist);
+
+ kfree(dp->dccps_hc_rx_ccid_private);
+ dp->dccps_hc_rx_ccid_private = NULL;
+}
+
+static struct ccid ccid3 = {
+ .ccid_id = 3,
+ .ccid_name = "ccid3",
+ .ccid_owner = THIS_MODULE,
+ .ccid_init = ccid3_init,
+ .ccid_exit = ccid3_exit,
+ .ccid_hc_tx_init = ccid3_hc_tx_init,
+ .ccid_hc_tx_exit = ccid3_hc_tx_exit,
+ .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet,
+ .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent,
+ .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv,
+ .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options,
+ .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options,
+ .ccid_hc_rx_init = ccid3_hc_rx_init,
+ .ccid_hc_rx_exit = ccid3_hc_rx_exit,
+ .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options,
+ .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv,
+};
+
+module_param(ccid3_debug, int, 0444);
+MODULE_PARM_DESC(ccid3_debug, "Enable debug messages");
+
+static __init int ccid3_module_init(void)
+{
+ int rc = -ENOMEM;
+
+ ccid3_tx_hist_slab = kmem_cache_create("dccp_ccid3_tx_history",
+ sizeof(struct ccid3_tx_hist_entry), 0,
+ SLAB_HWCACHE_ALIGN, NULL, NULL);
+ if (ccid3_tx_hist_slab == NULL)
+ goto out;
+
+ ccid3_rx_hist_slab = kmem_cache_create("dccp_ccid3_rx_history",
+ sizeof(struct ccid3_rx_hist_entry), 0,
+ SLAB_HWCACHE_ALIGN, NULL, NULL);
+ if (ccid3_rx_hist_slab == NULL)
+ goto out_free_tx_history;
+
+ ccid3_loss_interval_hist_slab = kmem_cache_create("dccp_ccid3_loss_interval_history",
+ sizeof(struct ccid3_loss_interval_hist_entry), 0,
+ SLAB_HWCACHE_ALIGN, NULL, NULL);
+ if (ccid3_loss_interval_hist_slab == NULL)
+ goto out_free_rx_history;
+
+ rc = ccid_register(&ccid3);
+ if (rc != 0)
+ goto out_free_loss_interval_history;
+
+out:
+ return rc;
+out_free_loss_interval_history:
+ kmem_cache_destroy(ccid3_loss_interval_hist_slab);
+ ccid3_loss_interval_hist_slab = NULL;
+out_free_rx_history:
+ kmem_cache_destroy(ccid3_rx_hist_slab);
+ ccid3_rx_hist_slab = NULL;
+out_free_tx_history:
+ kmem_cache_destroy(ccid3_tx_hist_slab);
+ ccid3_tx_hist_slab = NULL;
+ goto out;
+}
+module_init(ccid3_module_init);
+
+static __exit void ccid3_module_exit(void)
+{
+ ccid_unregister(&ccid3);
+
+ if (ccid3_tx_hist_slab != NULL) {
+ kmem_cache_destroy(ccid3_tx_hist_slab);
+ ccid3_tx_hist_slab = NULL;
+ }
+ if (ccid3_rx_hist_slab != NULL) {
+ kmem_cache_destroy(ccid3_rx_hist_slab);
+ ccid3_rx_hist_slab = NULL;
+ }
+ if (ccid3_loss_interval_hist_slab != NULL) {
+ kmem_cache_destroy(ccid3_loss_interval_hist_slab);
+ ccid3_loss_interval_hist_slab = NULL;
+ }
+}
+module_exit(ccid3_module_exit);
+
+MODULE_AUTHOR("Ian McDonald <iam4@cs.waikato.ac.nz> & Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
+MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("net-dccp-ccid-3");
diff --git a/net/dccp/ccids/ccid3.h b/net/dccp/ccids/ccid3.h
new file mode 100644
index 0000000..5d6b623
--- /dev/null
+++ b/net/dccp/ccids/ccid3.h
@@ -0,0 +1,137 @@
+/*
+ * net/dccp/ccids/ccid3.h
+ *
+ * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
+ *
+ * An implementation of the DCCP protocol
+ *
+ * This code has been developed by the University of Waikato WAND
+ * research group. For further information please see http://www.wand.net.nz/
+ * or e-mail Ian McDonald - iam4@cs.waikato.ac.nz
+ *
+ * This code also uses code from Lulea University, rereleased as GPL by its
+ * authors:
+ * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
+ *
+ * Changes to meet Linux coding standards, to make it meet latest ccid3 draft
+ * and to make it work as a loadable module in the DCCP stack written by
+ * Arnaldo Carvalho de Melo <acme@conectiva.com.br>.
+ *
+ * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#ifndef _DCCP_CCID3_H_
+#define _DCCP_CCID3_H_
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/timer.h>
+
+struct ccid3_tx_hist_entry {
+ struct list_head ccid3htx_node;
+ u64 ccid3htx_seqno:48,
+ ccid3htx_win_count:8,
+ ccid3htx_sent:1;
+ struct timeval ccid3htx_tstamp;
+};
+
+struct ccid3_options_received {
+ u64 ccid3or_seqno:48,
+ ccid3or_loss_intervals_idx:16;
+ u16 ccid3or_loss_intervals_len;
+ u32 ccid3or_loss_event_rate;
+ u32 ccid3or_receive_rate;
+};
+
+/** struct ccid3_hc_tx_sock - CCID3 sender half connection congestion control block
+ *
+ * @ccid3hctx_state - Sender state
+ * @ccid3hctx_x - Current sending rate
+ * @ccid3hctx_x_recv - Receive rate
+ * @ccid3hctx_x_calc - Calculated send (?) rate
+ * @ccid3hctx_s - Packet size
+ * @ccid3hctx_rtt - Estimate of current round trip time in usecs
+ * @@ccid3hctx_p - Current loss event rate (0-1) scaled by 1000000
+ * @ccid3hctx_last_win_count - Last window counter sent
+ * @ccid3hctx_t_last_win_count - Timestamp of earliest packet with last_win_count value sent
+ * @ccid3hctx_no_feedback_timer - Handle to no feedback timer
+ * @ccid3hctx_idle - FIXME
+ * @ccid3hctx_t_ld - Time last doubled during slow start
+ * @ccid3hctx_t_nom - Nominal send time of next packet
+ * @ccid3hctx_t_ipi - Interpacket (send) interval
+ * @ccid3hctx_delta - Send timer delta
+ * @ccid3hctx_hist - Packet history
+ */
+struct ccid3_hc_tx_sock {
+ u32 ccid3hctx_x;
+ u32 ccid3hctx_x_recv;
+ u32 ccid3hctx_x_calc;
+ u16 ccid3hctx_s;
+ u32 ccid3hctx_rtt;
+ u32 ccid3hctx_p;
+ u8 ccid3hctx_state;
+ u8 ccid3hctx_last_win_count;
+ u8 ccid3hctx_idle;
+ struct timeval ccid3hctx_t_last_win_count;
+ struct timer_list ccid3hctx_no_feedback_timer;
+ struct timeval ccid3hctx_t_ld;
+ struct timeval ccid3hctx_t_nom;
+ u32 ccid3hctx_t_ipi;
+ u32 ccid3hctx_delta;
+ struct list_head ccid3hctx_hist;
+ struct ccid3_options_received ccid3hctx_options_received;
+};
+
+struct ccid3_loss_interval_hist_entry {
+ struct list_head ccid3lih_node;
+ u64 ccid3lih_seqno:48,
+ ccid3lih_win_count:4;
+ u32 ccid3lih_interval;
+};
+
+struct ccid3_rx_hist_entry {
+ struct list_head ccid3hrx_node;
+ u64 ccid3hrx_seqno:48,
+ ccid3hrx_win_count:4,
+ ccid3hrx_type:4;
+ u32 ccid3hrx_ndp; /* In fact it is from 8 to 24 bits */
+ struct timeval ccid3hrx_tstamp;
+};
+
+struct ccid3_hc_rx_sock {
+ u64 ccid3hcrx_seqno_last_counter:48,
+ ccid3hcrx_state:8,
+ ccid3hcrx_last_counter:4;
+ unsigned long ccid3hcrx_rtt;
+ u32 ccid3hcrx_p;
+ u32 ccid3hcrx_bytes_recv;
+ struct timeval ccid3hcrx_tstamp_last_feedback;
+ struct timeval ccid3hcrx_tstamp_last_ack;
+ struct list_head ccid3hcrx_hist;
+ struct list_head ccid3hcrx_loss_interval_hist;
+ u16 ccid3hcrx_s;
+ u32 ccid3hcrx_pinv;
+ u32 ccid3hcrx_elapsed_time;
+ u32 ccid3hcrx_x_recv;
+};
+
+#define ccid3_hc_tx_field(s,field) (s->dccps_hc_tx_ccid_private == NULL ? 0 : \
+ ((struct ccid3_hc_tx_sock *)s->dccps_hc_tx_ccid_private)->ccid3hctx_##field)
+
+#define ccid3_hc_rx_field(s,field) (s->dccps_hc_rx_ccid_private == NULL ? 0 : \
+ ((struct ccid3_hc_rx_sock *)s->dccps_hc_rx_ccid_private)->ccid3hcrx_##field)
+
+#endif /* _DCCP_CCID3_H_ */