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-rw-r--r--tc/f_cgroup.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/tc/f_cgroup.c b/tc/f_cgroup.c
new file mode 100644
index 0000000..633700e
--- /dev/null
+++ b/tc/f_cgroup.c
@@ -0,0 +1,114 @@
+/*
+ * 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 ]\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;
+ }
+ }
+
+ 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], 0);
+
+ return 0;
+}
+
+struct filter_util cgroup_filter_util = {
+ .id = "cgroup",
+ .parse_fopt = cgroup_parse_opt,
+ .print_fopt = cgroup_print_opt,
+};