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selftests/bpf: add cgroup skb direct packet access test

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This verifies that programs of BPF_PROG_TYPE_CGROUP_SKB can access
skb->data_end with direct packet access when being run with
BPF_PROG_TEST_RUN.

Signed-off-by: Mahe Tardy <mahe.tardy@gmail.com>
Link: https://lore.kernel.org/r/20241125152603.375898-2-mahe.tardy@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Mahe Tardy
2024-11-25 15:26:03 +00:00
committed by Alexei Starovoitov
parent ed3e469d02
commit 9aef3aaa70
2 changed files with 43 additions and 0 deletions
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28
tools/testing/selftests/bpf/prog_tests/cgroup_skb_direct_packet_access.c Normal file
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@@ -0,0 +1,28 @@
// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include "cgroup_skb_direct_packet_access.skel.h"
void test_cgroup_skb_prog_run_direct_packet_access(void)
{
int err;
struct cgroup_skb_direct_packet_access *skel;
char test_skb[64] = {};
LIBBPF_OPTS(bpf_test_run_opts, topts,
.data_in = test_skb,
.data_size_in = sizeof(test_skb),
);
skel = cgroup_skb_direct_packet_access__open_and_load();
if (!ASSERT_OK_PTR(skel, "cgroup_skb_direct_packet_access__open_and_load"))
return;
err = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.direct_packet_access), &topts);
ASSERT_OK(err, "bpf_prog_test_run_opts err");
ASSERT_EQ(topts.retval, 1, "retval");
ASSERT_NEQ(skel->bss->data_end, 0, "data_end");
cgroup_skb_direct_packet_access__destroy(skel);
}

15
tools/testing/selftests/bpf/progs/cgroup_skb_direct_packet_access.c Normal file
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@@ -0,0 +1,15 @@
// SPDX-License-Identifier: GPL-2.0
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
__u32 data_end;
SEC("cgroup_skb/ingress")
int direct_packet_access(struct __sk_buff *skb)
{
data_end = skb->data_end;
return 1;
}
char _license[] SEC("license") = "GPL";