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selftests/bpf: add cgroup_skb netns cookie tests

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Add netns cookie test that verifies the helper is now supported and work
in the context of cgroup_skb programs.

Signed-off-by: Mahe Tardy <mahe.tardy@gmail.com>
Link: https://lore.kernel.org/r/20250225125031.258740-2-mahe.tardy@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Mahe Tardy 2025-02-25 12:50:31 +00:00 committed by Alexei Starovoitov
parent c221d3744a
commit 9138048bb5
2 changed files with 23 additions and 7 deletions
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21
tools/testing/selftests/bpf/prog_tests/netns_cookie.c
View File

@ -33,20 +33,25 @@ void test_netns_cookie(void)
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"))
if (!ASSERT_OK_PTR(skel->links.get_netns_cookie_sockops, "prog_attach_sockops"))
goto done;
verdict = bpf_program__fd(skel->progs.get_netns_cookie_sk_msg);
map = bpf_map__fd(skel->maps.sock_map);
err = bpf_prog_attach(verdict, map, BPF_SK_MSG_VERDICT, 0);
if (!ASSERT_OK(err, "prog_attach"))
if (!ASSERT_OK(err, "prog_attach_sk_msg"))
goto done;
tc_fd = bpf_program__fd(skel->progs.get_netns_cookie_tcx);
err = bpf_prog_attach_opts(tc_fd, loopback, BPF_TCX_INGRESS, &opta);
if (!ASSERT_OK(err, "prog_attach"))
if (!ASSERT_OK(err, "prog_attach_tcx"))
goto done;
skel->links.get_netns_cookie_cgroup_skb = bpf_program__attach_cgroup(
skel->progs.get_netns_cookie_cgroup_skb, cgroup_fd);
if (!ASSERT_OK_PTR(skel->links.get_netns_cookie_cgroup_skb, "prog_attach_cgroup_skb"))
goto cleanup_tc;
server_fd = start_server(AF_INET6, SOCK_STREAM, "::1", 0, 0);
if (CHECK(server_fd < 0, "start_server", "errno %d\n", errno))
goto cleanup_tc;
@ -69,16 +74,18 @@ void test_netns_cookie(void)
if (!ASSERT_OK(err, "getsockopt"))
goto cleanup_tc;
ASSERT_EQ(val, cookie_expected_value, "cookie_value");
ASSERT_EQ(val, cookie_expected_value, "cookie_value_sockops");
err = bpf_map_lookup_elem(bpf_map__fd(skel->maps.sk_msg_netns_cookies),
&client_fd, &val);
if (!ASSERT_OK(err, "map_lookup(sk_msg_netns_cookies)"))
goto cleanup_tc;
ASSERT_EQ(val, cookie_expected_value, "cookie_value");
ASSERT_EQ(skel->bss->tcx_init_netns_cookie, cookie_expected_value, "cookie_value");
ASSERT_EQ(skel->bss->tcx_netns_cookie, cookie_expected_value, "cookie_value");
ASSERT_EQ(val, cookie_expected_value, "cookie_value_sk_msg");
ASSERT_EQ(skel->bss->tcx_init_netns_cookie, cookie_expected_value, "cookie_value_init_tcx");
ASSERT_EQ(skel->bss->tcx_netns_cookie, cookie_expected_value, "cookie_value_tcx");
ASSERT_EQ(skel->bss->cgroup_skb_init_netns_cookie, cookie_expected_value, "cookie_value_init_cgroup_skb");
ASSERT_EQ(skel->bss->cgroup_skb_netns_cookie, cookie_expected_value, "cookie_value_cgroup_skb");
cleanup_tc:
err = bpf_prog_detach_opts(tc_fd, loopback, BPF_TCX_INGRESS, &optd);

9
tools/testing/selftests/bpf/progs/netns_cookie_prog.c
View File

@ -28,6 +28,7 @@ struct {
} sock_map SEC(".maps");
int tcx_init_netns_cookie, tcx_netns_cookie;
int cgroup_skb_init_netns_cookie, cgroup_skb_netns_cookie;
SEC("sockops")
int get_netns_cookie_sockops(struct bpf_sock_ops *ctx)
@ -91,4 +92,12 @@ int get_netns_cookie_tcx(struct __sk_buff *skb)
return TCX_PASS;
}
SEC("cgroup_skb/ingress")
int get_netns_cookie_cgroup_skb(struct __sk_buff *skb)
{
cgroup_skb_init_netns_cookie = bpf_get_netns_cookie(NULL);
cgroup_skb_netns_cookie = bpf_get_netns_cookie(skb);
return SK_PASS;
}
char _license[] SEC("license") = "GPL";