Commit e81fbd4c authored by Daniel Xu's avatar Daniel Xu Committed by Daniel Borkmann
Browse files

selftests/bpf: Add existing connection bpf_*_ct_lookup() test 



Add a test where we do a conntrack lookup on an existing connection.
This is nice because it's a more realistic test than artifically
creating a ct entry and looking it up afterwards.

Signed-off-by: default avatarDaniel Xu <dxu@dxuuu.xyz>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarKumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/bpf/de5a617832f38f8b5631cc87e2a836da7c94d497.1660254747.git.dxu@dxuuu.xyz
parent cea55885

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

+59 −0
Original line number Diff line number Diff line
@@ -24,10 +24,34 @@ enum { 
	TEST_TC_BPF,

};



#define TIMEOUT_MS 3000



static int connect_to_server(int srv_fd)

{

	int fd = -1;



	fd = socket(AF_INET, SOCK_STREAM, 0);

	if (!ASSERT_GE(fd, 0, "socket"))

		goto out;



	if (!ASSERT_EQ(connect_fd_to_fd(fd, srv_fd, TIMEOUT_MS), 0, "connect_fd_to_fd")) {

		close(fd);

		fd = -1;

	}

out:

	return fd;

}



static void test_bpf_nf_ct(int mode)

{

	const char *iptables = "iptables -t raw %s PREROUTING -j CT";

	int srv_fd = -1, client_fd = -1, srv_client_fd = -1;

	struct sockaddr_in peer_addr = {};

	struct test_bpf_nf *skel;

	int prog_fd, err;

	socklen_t len;

	u16 srv_port;

	char cmd[64];

	LIBBPF_OPTS(bpf_test_run_opts, topts,

		.data_in = &pkt_v4,

		.data_size_in = sizeof(pkt_v4),
@@ -38,6 +62,32 @@ static void test_bpf_nf_ct(int mode) 
	if (!ASSERT_OK_PTR(skel, "test_bpf_nf__open_and_load"))

		return;



	/* Enable connection tracking */

	snprintf(cmd, sizeof(cmd), iptables, "-A");

	if (!ASSERT_OK(system(cmd), "iptables"))

		goto end;



	srv_port = (mode == TEST_XDP) ? 5005 : 5006;

	srv_fd = start_server(AF_INET, SOCK_STREAM, "127.0.0.1", srv_port, TIMEOUT_MS);

	if (!ASSERT_GE(srv_fd, 0, "start_server"))

		goto end;



	client_fd = connect_to_server(srv_fd);

	if (!ASSERT_GE(client_fd, 0, "connect_to_server"))

		goto end;



	len = sizeof(peer_addr);

	srv_client_fd = accept(srv_fd, (struct sockaddr *)&peer_addr, &len);

	if (!ASSERT_GE(srv_client_fd, 0, "accept"))

		goto end;

	if (!ASSERT_EQ(len, sizeof(struct sockaddr_in), "sockaddr len"))

		goto end;



	skel->bss->saddr = peer_addr.sin_addr.s_addr;

	skel->bss->sport = peer_addr.sin_port;

	skel->bss->daddr = peer_addr.sin_addr.s_addr;

	skel->bss->dport = htons(srv_port);



	if (mode == TEST_XDP)

		prog_fd = bpf_program__fd(skel->progs.nf_xdp_ct_test);

	else
@@ -63,7 +113,16 @@ static void test_bpf_nf_ct(int mode) 
	ASSERT_LE(skel->bss->test_delta_timeout, 10, "Test for max ct timeout update");

	/* expected status is IPS_SEEN_REPLY */

	ASSERT_EQ(skel->bss->test_status, 2, "Test for ct status update ");

	ASSERT_EQ(skel->data->test_exist_lookup, 0, "Test existing connection lookup");

end:

	if (srv_client_fd != -1)

		close(srv_client_fd);

	if (client_fd != -1)

		close(client_fd);

	if (srv_fd != -1)

		close(srv_fd);

	snprintf(cmd, sizeof(cmd), iptables, "-D");

	system(cmd);

	test_bpf_nf__destroy(skel);

}

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

+18 −0
Original line number Diff line number Diff line
@@ -23,6 +23,11 @@ int test_insert_entry = -EAFNOSUPPORT; 
int test_succ_lookup = -ENOENT;

u32 test_delta_timeout = 0;

u32 test_status = 0;

__be32 saddr = 0;

__be16 sport = 0;

__be32 daddr = 0;

__be16 dport = 0;

int test_exist_lookup = -ENOENT;



struct nf_conn;
@@ -160,6 +165,19 @@ nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32, 
		}

		test_alloc_entry = 0;

	}



	bpf_tuple.ipv4.saddr = saddr;

	bpf_tuple.ipv4.daddr = daddr;

	bpf_tuple.ipv4.sport = sport;

	bpf_tuple.ipv4.dport = dport;

	ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def,

		       sizeof(opts_def));

	if (ct) {

		test_exist_lookup = 0;

		bpf_ct_release(ct);

	} else {

		test_exist_lookup = opts_def.error;

	}

}



SEC("xdp")