(Logical change 1.3)

1 files changed, 222 insertions, 0 deletions

diff --git a/tc/q_red.c b/tc/q_red.c
index e69de29b..c156d47c 100644
--- a/tc/q_red.c
+++ b/tc/q_red.c
@@ -0,0 +1,222 @@
+/*
+ * q_red.c		RED.
+ *
+ *		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.
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+
+#include "utils.h"
+#include "tc_util.h"
+
+#include "tc_red.h"
+
+static void explain(void)
+{
+	fprintf(stderr, "Usage: ... red limit BYTES min BYTES max BYTES avpkt BYTES burst PACKETS\n");
+	fprintf(stderr, "               probability PROBABILITY bandwidth KBPS [ ecn ]\n");
+}
+
+#define usage() return(-1)
+
+static int red_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
+{
+	int ok=0;
+	struct tc_red_qopt opt;
+	unsigned burst = 0;
+	unsigned avpkt = 0;
+	double probability = 0.02;
+	unsigned rate = 0;
+	int ecn_ok = 0;
+	int wlog;
+	__u8 sbuf[256];
+	struct rtattr *tail;
+
+	memset(&opt, 0, sizeof(opt));
+
+	while (argc > 0) {
+		if (strcmp(*argv, "limit") == 0) {
+			NEXT_ARG();
+			if (get_size(&opt.limit, *argv)) {
+				fprintf(stderr, "Illegal \"limit\"\n");
+				return -1;
+			}
+			ok++;
+		} else if (strcmp(*argv, "min") == 0) {
+			NEXT_ARG();
+			if (get_size(&opt.qth_min, *argv)) {
+				fprintf(stderr, "Illegal \"min\"\n");
+				return -1;
+			}
+			ok++;
+		} else if (strcmp(*argv, "max") == 0) {
+			NEXT_ARG();
+			if (get_size(&opt.qth_max, *argv)) {
+				fprintf(stderr, "Illegal \"max\"\n");
+				return -1;
+			}
+			ok++;
+		} else if (strcmp(*argv, "burst") == 0) {
+			NEXT_ARG();
+			if (get_unsigned(&burst, *argv, 0)) {
+				fprintf(stderr, "Illegal \"burst\"\n");
+				return -1;
+			}
+			ok++;
+		} else if (strcmp(*argv, "avpkt") == 0) {
+			NEXT_ARG();
+			if (get_size(&avpkt, *argv)) {
+				fprintf(stderr, "Illegal \"avpkt\"\n");
+				return -1;
+			}
+			ok++;
+		} else if (strcmp(*argv, "probability") == 0) {
+			NEXT_ARG();
+			if (sscanf(*argv, "%lg", &probability) != 1) {
+				fprintf(stderr, "Illegal \"probability\"\n");
+				return -1;
+			}
+			ok++;
+		} else if (strcmp(*argv, "bandwidth") == 0) {
+			NEXT_ARG();
+			if (get_rate(&rate, *argv)) {
+				fprintf(stderr, "Illegal \"bandwidth\"\n");
+				return -1;
+			}
+			ok++;
+		} else if (strcmp(*argv, "ecn") == 0) {
+			ecn_ok = 1;
+			ok++;
+		} else if (strcmp(*argv, "help") == 0) {
+			explain();
+			return -1;
+		} else {
+			fprintf(stderr, "What is \"%s\"?\n", *argv);
+			explain();
+			return -1;
+		}
+		argc--; argv++;
+	}
+
+	if (!ok)
+		return 0;
+
+	if (rate == 0)
+		get_rate(&rate, "10Mbit");
+
+	if (!opt.qth_min || !opt.qth_max || !burst || !opt.limit || !avpkt) {
+		fprintf(stderr, "Required parameter (min, max, burst, limit, avpket) is missing\n");
+		return -1;
+	}
+
+	if ((wlog = tc_red_eval_ewma(opt.qth_min, burst, avpkt)) < 0) {
+		fprintf(stderr, "RED: failed to calculate EWMA constant.\n");
+		return -1;
+	}
+	if (wlog >= 10)
+		fprintf(stderr, "RED: WARNING. Burst %d seems to be to large.\n", burst);
+	opt.Wlog = wlog;
+	if ((wlog = tc_red_eval_P(opt.qth_min, opt.qth_max, probability)) < 0) {
+		fprintf(stderr, "RED: failed to calculate probability.\n");
+		return -1;
+	}
+	opt.Plog = wlog;
+	if ((wlog = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf)) < 0) {
+		fprintf(stderr, "RED: failed to calculate idle damping table.\n");
+		return -1;
+	}
+	opt.Scell_log = wlog;
+	if (ecn_ok) {
+#ifdef TC_RED_ECN
+		opt.flags |= TC_RED_ECN;
+#else
+		fprintf(stderr, "RED: ECN support is missing in this binary.\n");
+		return -1;
+#endif
+	}
+
+	tail = (struct rtattr*)(((void*)n)+NLMSG_ALIGN(n->nlmsg_len));
+
+	addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
+	addattr_l(n, 1024, TCA_RED_PARMS, &opt, sizeof(opt));
+	addattr_l(n, 1024, TCA_RED_STAB, sbuf, 256);
+	tail->rta_len = (((void*)n)+NLMSG_ALIGN(n->nlmsg_len)) - (void*)tail;
+	return 0;
+}
+
+static int red_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
+{
+	struct rtattr *tb[TCA_RED_STAB+1];
+	struct tc_red_qopt *qopt;
+	SPRINT_BUF(b1);
+	SPRINT_BUF(b2);
+	SPRINT_BUF(b3);
+
+	if (opt == NULL)
+		return 0;
+
+	memset(tb, 0, sizeof(tb));
+	parse_rtattr(tb, TCA_RED_STAB, RTA_DATA(opt), RTA_PAYLOAD(opt));
+
+	if (tb[TCA_RED_PARMS] == NULL)
+		return -1;
+	qopt = RTA_DATA(tb[TCA_RED_PARMS]);
+	if (RTA_PAYLOAD(tb[TCA_RED_PARMS])  < sizeof(*qopt))
+		return -1;
+	fprintf(f, "limit %s min %s max %s ",
+		sprint_size(qopt->limit, b1),
+		sprint_size(qopt->qth_min, b2),
+		sprint_size(qopt->qth_max, b3));
+#ifdef TC_RED_ECN
+	if (qopt->flags & TC_RED_ECN)
+		fprintf(f, "ecn ");
+#endif
+	if (show_details) {
+		fprintf(f, "ewma %u Plog %u Scell_log %u",
+			qopt->Wlog, qopt->Plog, qopt->Scell_log);
+	}
+	return 0;
+}
+
+static int red_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
+{
+#ifdef TC_RED_ECN
+	struct tc_red_xstats *st;
+
+	if (xstats == NULL)
+		return 0;
+
+	if (RTA_PAYLOAD(xstats) < sizeof(*st))
+		return -1;
+
+	st = RTA_DATA(xstats);
+	fprintf(f, "  marked %u early %u pdrop %u other %u",
+		st->marked, st->early, st->pdrop, st->other);
+	return 0;
+	
+#endif
+	return 0;
+}
+
+
+struct qdisc_util red_util = {
+	NULL,
+	"red",
+	red_parse_opt,
+	red_print_opt,
+	red_print_xstats,
+};