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selftests/bpf: Add connmark read test

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Test that the prog can read from the connection mark. This test is nice
because it ensures progs can interact with netfilter subsystem
correctly.

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/d3bc620a491e4c626c20d80631063922cbe13e2b.1660254747.git.dxu@dxuuu.xyz
This commit is contained in:
Daniel Xu 2022-08-11 15:55:26 -06:00 committed by Daniel Borkmann
parent e81fbd4c1b
commit 99799de2cb
2 changed files with 5 additions and 1 deletions
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3
tools/testing/selftests/bpf/prog_tests/bpf_nf.c
View File

@ -44,7 +44,7 @@ out:
static void test_bpf_nf_ct(int mode)
{
const char *iptables = "iptables -t raw %s PREROUTING -j CT";
const char *iptables = "iptables -t raw %s PREROUTING -j CONNMARK --set-mark 42/0";
int srv_fd = -1, client_fd = -1, srv_client_fd = -1;
struct sockaddr_in peer_addr = {};
struct test_bpf_nf *skel;
@ -114,6 +114,7 @@ static void test_bpf_nf_ct(int mode)
/* 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");
ASSERT_EQ(skel->bss->test_exist_lookup_mark, 43, "Test existing connection lookup ctmark");
end:
if (srv_client_fd != -1)
close(srv_client_fd);

3
tools/testing/selftests/bpf/progs/test_bpf_nf.c
View File

@ -28,6 +28,7 @@ __be16 sport = 0;
__be32 daddr = 0;
__be16 dport = 0;
int test_exist_lookup = -ENOENT;
u32 test_exist_lookup_mark = 0;
struct nf_conn;
@ -174,6 +175,8 @@ nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32,
sizeof(opts_def));
if (ct) {
test_exist_lookup = 0;
if (ct->mark == 42)
test_exist_lookup_mark = 43;
bpf_ct_release(ct);
} else {
test_exist_lookup = opts_def.error;