From: =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= <toke@redhat.com>
Date: Fri, 7 Jan 2022 23:11:15 +0100
Subject: bpf/selftests: Add check for updating XDP bpf_link with wrong program
type
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Patch-mainline: v5.17-rc1
Git-commit: 036a05f50bd777134b1955f400e8d24c0149fef4
References: jsc#PED-1368
Add a check to the xdp_link selftest that the kernel rejects replacing an
XDP program with a different program type on link update.
v2:
- Split this out into its own patch.
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/20220107221115.326171-3-toke@redhat.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
tools/testing/selftests/bpf/prog_tests/xdp_link.c | 5 +++++
tools/testing/selftests/bpf/progs/test_xdp_link.c | 6 ++++++
2 files changed, 11 insertions(+)
--- a/tools/testing/selftests/bpf/prog_tests/xdp_link.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_link.c
@@ -127,6 +127,11 @@ void serial_test_xdp_link(void)
ASSERT_EQ(link_info.prog_id, id1, "link_prog_id");
ASSERT_EQ(link_info.xdp.ifindex, IFINDEX_LO, "link_ifindex");
+ /* updating program under active BPF link with different type fails */
+ err = bpf_link__update_program(link, skel1->progs.tc_handler);
+ if (!ASSERT_ERR(err, "link_upd_invalid"))
+ goto cleanup;
+
err = bpf_link__detach(link);
if (!ASSERT_OK(err, "link_detach"))
goto cleanup;
--- a/tools/testing/selftests/bpf/progs/test_xdp_link.c
+++ b/tools/testing/selftests/bpf/progs/test_xdp_link.c
@@ -10,3 +10,9 @@ int xdp_handler(struct xdp_md *xdp)
{
return 0;
}
+
+SEC("tc")
+int tc_handler(struct __sk_buff *skb)
+{
+ return 0;
+}