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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* f_cgroup.c Control Group Classifier
*
* 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)
print_0xhex(PRINT_ANY, "handle", "handle %#llx ", handle);
if (tb[TCA_CGROUP_EMATCHES])
print_ematch(f, tb[TCA_CGROUP_EMATCHES]);
if (tb[TCA_CGROUP_POLICE]) {
print_nl();
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,
};
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