Commit 374e74de authored by Xu Liu's avatar Xu Liu Committed by Daniel Borkmann
Browse files

selftests/bpf: Test for get_netns_cookie 



Add test to use get_netns_cookie() from BPF_PROG_TYPE_SOCK_OPS.

Signed-off-by: default avatarXu Liu <liuxu623@gmail.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarSong Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20210818105820.91894-3-liuxu623@gmail.com
parent 6cf1770d

tools/testing/selftests/bpf/prog_tests/netns_cookie.c

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+61 −0
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// SPDX-License-Identifier: GPL-2.0



#include <test_progs.h>

#include "netns_cookie_prog.skel.h"

#include "network_helpers.h"



#ifndef SO_NETNS_COOKIE

#define SO_NETNS_COOKIE 71

#endif



static int duration;



void test_netns_cookie(void)

{

	int server_fd = 0, client_fd = 0, cgroup_fd = 0, err = 0, val = 0;

	struct netns_cookie_prog *skel;

	uint64_t cookie_expected_value;

	socklen_t vallen = sizeof(cookie_expected_value);



	skel = netns_cookie_prog__open_and_load();

	if (!ASSERT_OK_PTR(skel, "skel_open"))

		return;



	cgroup_fd = test__join_cgroup("/netns_cookie");

	if (CHECK(cgroup_fd < 0, "join_cgroup", "cgroup creation failed\n"))

		goto out;



	skel->links.get_netns_cookie_sockops = bpf_program__attach_cgroup(

		skel->progs.get_netns_cookie_sockops, cgroup_fd);

	if (!ASSERT_OK_PTR(skel->links.get_netns_cookie_sockops, "prog_attach"))

		goto close_cgroup_fd;



	server_fd = start_server(AF_INET6, SOCK_STREAM, "::1", 0, 0);

	if (CHECK(server_fd < 0, "start_server", "errno %d\n", errno))

		goto close_cgroup_fd;



	client_fd = connect_to_fd(server_fd, 0);

	if (CHECK(client_fd < 0, "connect_to_fd", "errno %d\n", errno))

		goto close_server_fd;



	err = bpf_map_lookup_elem(bpf_map__fd(skel->maps.netns_cookies),

				&client_fd, &val);

	if (!ASSERT_OK(err, "map_lookup(socket_cookies)"))

		goto close_client_fd;



	err = getsockopt(client_fd, SOL_SOCKET, SO_NETNS_COOKIE,

				&cookie_expected_value, &vallen);

	if (!ASSERT_OK(err, "getsockopt)"))

		goto close_client_fd;



	ASSERT_EQ(val, cookie_expected_value, "cookie_value");



close_client_fd:

	close(client_fd);

close_server_fd:

	close(server_fd);

close_cgroup_fd:

	close(cgroup_fd);

out:

	netns_cookie_prog__destroy(skel);

}

tools/testing/selftests/bpf/progs/netns_cookie_prog.c

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// SPDX-License-Identifier: GPL-2.0



#include "vmlinux.h"



#include <bpf/bpf_helpers.h>



#define AF_INET6 10



struct {

	__uint(type, BPF_MAP_TYPE_SK_STORAGE);

	__uint(map_flags, BPF_F_NO_PREALLOC);

	__type(key, int);

	__type(value, int);

} netns_cookies SEC(".maps");



SEC("sockops")

int get_netns_cookie_sockops(struct bpf_sock_ops *ctx)

{

	struct bpf_sock *sk = ctx->sk;

	int *cookie;



	if (ctx->family != AF_INET6)

		return 1;



	if (ctx->op != BPF_SOCK_OPS_TCP_CONNECT_CB)

		return 1;



	if (!sk)

		return 1;



	cookie = bpf_sk_storage_get(&netns_cookies, sk, 0,

				BPF_SK_STORAGE_GET_F_CREATE);

	if (!cookie)

		return 1;



	*cookie = bpf_get_netns_cookie(ctx);



	return 1;

}