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

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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: Daniel Xu <dxu@dxuuu.xyz>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/bpf/de5a617832f38f8b5631cc87e2a836da7c94d497.1660254747.git.dxu@dxuuu.xyz
This commit is contained in:
Daniel Xu 2022-08-11 15:55:25 -06:00 committed by Daniel Borkmann
parent cea558855c
commit e81fbd4c1b
2 changed files with 77 additions and 0 deletions
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59
tools/testing/selftests/bpf/prog_tests/bpf_nf.c
View File

@ -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);
}

18
tools/testing/selftests/bpf/progs/test_bpf_nf.c
View File

@ -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")