Commit 9aef3aaa authored by Mahe Tardy's avatar Mahe Tardy Committed by Alexei Starovoitov
Browse files

selftests/bpf: add cgroup skb direct packet access test 



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: default avatarMahe Tardy <mahe.tardy@gmail.com>
Link: https://lore.kernel.org/r/20241125152603.375898-2-mahe.tardy@gmail.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent ed3e469d

tools/testing/selftests/bpf/prog_tests/cgroup_skb_direct_packet_access.c

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// 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);

}

tools/testing/selftests/bpf/progs/cgroup_skb_direct_packet_access.c

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// 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";