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Commit 609b1c32 authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

samples/bpf: Add detach option to test_cgrp2_sock 



Add option to detach programs from a cgroup.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent fa38aa17

samples/bpf/test_cgrp2_sock.c

+35 −15
Original line number Diff line number Diff line
@@ -114,7 +114,12 @@ static int prog_load(__u32 idx, __u32 mark, __u32 prio) 


static int usage(const char *argv0)

{

	printf("Usage: %s -b bind-to-dev -m mark -p prio cg-path\n", argv0);

	printf("Usage:\n");

	printf("  Attach a program\n");

	printf("  %s -b bind-to-dev -m mark -p prio cg-path\n", argv0);

	printf("\n");

	printf("  Detach a program\n");

	printf("  %s -d cg-path\n", argv0);

	return EXIT_FAILURE;

}
@@ -123,10 +128,14 @@ int main(int argc, char **argv) 
	__u32 idx = 0, mark = 0, prio = 0;

	const char *cgrp_path = NULL;

	int cg_fd, prog_fd, ret;

	int do_attach = 1;

	int rc;



	while ((rc = getopt(argc, argv, "b:m:p:")) != -1) {

	while ((rc = getopt(argc, argv, "db:m:p:")) != -1) {

		switch (rc) {

		case 'd':

			do_attach = 0;

			break;

		case 'b':

			idx = if_nametoindex(optarg);

			if (!idx) {
@@ -157,7 +166,7 @@ int main(int argc, char **argv) 
		return EXIT_FAILURE;

	}



	if (!idx && !mark && !prio) {

	if (do_attach && !idx && !mark && !prio) {

		fprintf(stderr,

			"One of device, mark or priority must be given\n");

		return EXIT_FAILURE;
@@ -169,6 +178,7 @@ int main(int argc, char **argv) 
		return EXIT_FAILURE;

	}



	if (do_attach) {

		prog_fd = prog_load(idx, mark, prio);

		if (prog_fd < 0) {

			printf("Failed to load prog: '%s'\n", strerror(errno));
@@ -177,12 +187,22 @@ int main(int argc, char **argv) 
			return EXIT_FAILURE;

		}



	ret = bpf_prog_attach(prog_fd, cg_fd, BPF_CGROUP_INET_SOCK_CREATE, 0);

		ret = bpf_prog_attach(prog_fd, cg_fd,

				      BPF_CGROUP_INET_SOCK_CREATE, 0);

		if (ret < 0) {

			printf("Failed to attach prog to cgroup: '%s'\n",

			       strerror(errno));

			return EXIT_FAILURE;

		}

	} else {

		ret = bpf_prog_detach(cg_fd, BPF_CGROUP_INET_SOCK_CREATE);

		if (ret < 0) {

			printf("Failed to detach prog from cgroup: '%s'\n",

			       strerror(errno));

			return EXIT_FAILURE;

		}

	}



	close(cg_fd);

	return EXIT_SUCCESS;

}