cgroup support

Stephen,

iproute2 part of the cgroup classifier that has been included upstream
for a while. Please apply.

tc/Makefile

@@ -20,6 +20,7 @@ TCMODULES += f_route.o
 TCMODULES += f_fw.o
 TCMODULES += f_basic.o
 TCMODULES += f_flow.o
+TCMODULES += f_cgroup.o
 TCMODULES += q_dsmark.o
 TCMODULES += q_gred.o
 TCMODULES += f_tcindex.o

tc/f_cgroup.c

@@ -0,0 +1,115 @@
+/*
+ * f_cgroup.c		Control Group Classifier
+ *
+ *		This program is free software; you can distribute 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:	Thomas Graf <tgraf@infradead.org>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "utils.h"
+#include "tc_util.h"
+#include "m_ematch.h"
+
+static void explain(void)
+{
+	fprintf(stderr, "Usage: ... cgroup [ match EMATCH_TREE ] [ police POLICE_SPEC ]\n");
+	fprintf(stderr, "                 [ action ACTION_SPEC ]\n");
+}
+
+static int cgroup_parse_opt(struct filter_util *qu, char *handle,
+			   int argc, char **argv, struct nlmsghdr *n)
+{
+	struct tcmsg *t = NLMSG_DATA(n);
+	struct rtattr *tail;
+	long h = 0;
+
+	if (handle) {
+		h = strtol(handle, NULL, 0);
+		if (h == LONG_MIN || h == LONG_MAX) {
+			fprintf(stderr, "Illegal handle \"%s\", must be numeric.\n",
+			    handle);
+			return -1;
+		}
+	}
+
+	t->tcm_handle = h;
+
+	tail = (struct rtattr*)(((void*)n)+NLMSG_ALIGN(n->nlmsg_len));
+	addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0);
+
+	while (argc > 0) {
+		if (matches(*argv, "match") == 0) {
+			NEXT_ARG();
+			if (parse_ematch(&argc, &argv, TCA_CGROUP_EMATCHES, n)) {
+				fprintf(stderr, "Illegal \"ematch\"\n");
+				return -1;
+			}
+			continue;
+		} else if (matches(*argv, "action") == 0) {
+			NEXT_ARG();
+			if (parse_action(&argc, &argv, TCA_CGROUP_ACT, n)) {
+				fprintf(stderr, "Illegal \"action\"\n");
+				return -1;
+			}
+			continue;
+
+		} else if (matches(*argv, "police") == 0) {
+			NEXT_ARG();
+			if (parse_police(&argc, &argv, TCA_CGROUP_POLICE, n)) {
+				fprintf(stderr, "Illegal \"police\"\n");
+				return -1;
+			}
+			continue;
+		} else if (strcmp(*argv, "help") == 0) {
+			explain();
+			return -1;
+		} else {
+			fprintf(stderr, "What is \"%s\"?\n", *argv);
+			explain();
+			return -1;
+		}
+		argc--; argv++;
+	}
+
+	tail->rta_len = (((void*)n)+n->nlmsg_len) - (void*)tail;
+	return 0;
+}
+
+static int cgroup_print_opt(struct filter_util *qu, FILE *f,
+			   struct rtattr *opt, __u32 handle)
+{
+	struct rtattr *tb[TCA_CGROUP_MAX+1];
+
+	if (opt == NULL)
+		return 0;
+
+	parse_rtattr_nested(tb, TCA_CGROUP_MAX, opt);
+
+	if (handle)
+		fprintf(f, "handle 0x%x ", handle);
+
+	if (tb[TCA_CGROUP_EMATCHES])
+		print_ematch(f, tb[TCA_CGROUP_EMATCHES]);
+
+	if (tb[TCA_CGROUP_POLICE]) {
+		fprintf(f, "\n");
+		tc_print_police(f, tb[TCA_CGROUP_POLICE]);
+	}
+
+	if (tb[TCA_CGROUP_ACT])
+		tc_print_action(f, tb[TCA_CGROUP_ACT]);
+
+	return 0;
+}
+
+struct filter_util cgroup_filter_util = {
+	.id = "cgroup",
+	.parse_fopt = cgroup_parse_opt,
+	.print_fopt = cgroup_print_opt,
+};