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Commit 37c7f863 authored by Daniel T. Lee's avatar Daniel T. Lee Committed by Alexei Starovoitov
Browse files

tools: bpftool: add net detach command to detach XDP on interface 



By this commit, using `bpftool net detach`, the attached XDP prog can
be detached. Detaching the BPF prog will be done through libbpf
'bpf_set_link_xdp_fd' with the progfd set to -1.

Acked-by: default avatarYonghong Song <yhs@fb.com>
Signed-off-by: default avatarDaniel T. Lee <danieltimlee@gmail.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 04949ccc

tools/bpf/bpftool/net.c

+41 −1
Original line number Diff line number Diff line
@@ -343,6 +343,43 @@ static int do_attach(int argc, char **argv) 
	return 0;

}



static int do_detach(int argc, char **argv)

{

	enum net_attach_type attach_type;

	int progfd, ifindex, err = 0;



	/* parse detach args */

	if (!REQ_ARGS(3))

		return -EINVAL;



	attach_type = parse_attach_type(*argv);

	if (attach_type == net_attach_type_size) {

		p_err("invalid net attach/detach type: %s", *argv);

		return -EINVAL;

	}

	NEXT_ARG();



	ifindex = net_parse_dev(&argc, &argv);

	if (ifindex < 1)

		return -EINVAL;



	/* detach xdp prog */

	progfd = -1;

	if (is_prefix("xdp", attach_type_strings[attach_type]))

		err = do_attach_detach_xdp(progfd, attach_type, ifindex, NULL);



	if (err < 0) {

		p_err("interface %s detach failed: %s",

		      attach_type_strings[attach_type], strerror(-err));

		return err;

	}



	if (json_output)

		jsonw_null(json_wtr);



	return 0;

}



static int do_show(int argc, char **argv)

{

	struct bpf_attach_info attach_info = {};
@@ -422,6 +459,7 @@ static int do_help(int argc, char **argv) 
	fprintf(stderr,

		"Usage: %s %s { show | list } [dev <devname>]\n"

		"       %s %s attach ATTACH_TYPE PROG dev <devname> [ overwrite ]\n"

		"       %s %s detach ATTACH_TYPE dev <devname>\n"

		"       %s %s help\n"

		"\n"

		"       " HELP_SPEC_PROGRAM "\n"
@@ -432,7 +470,8 @@ static int do_help(int argc, char **argv) 
		"      to dump program attachments. For program types\n"

		"      sk_{filter,skb,msg,reuseport} and lwt/seg6, please\n"

		"      consult iproute2.\n",

		bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2]);

		bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],

		bin_name, argv[-2]);



	return 0;

}
@@ -441,6 +480,7 @@ static const struct cmd cmds[] = { 
	{ "show",	do_show },

	{ "list",	do_show },

	{ "attach",	do_attach },

	{ "detach",	do_detach },

	{ "help",	do_help },

	{ 0 }

};