Commit 127e7dca authored by Liu Jian's avatar Liu Jian Committed by Daniel Borkmann
Browse files

selftests/bpf: Add test for skb_load_bytes 



Use bpf_prog_test_run_opts to test the skb_load_bytes function. Tests
the behavior when offset is greater than INT_MAX or a normal value.

Signed-off-by: default avatarLiu Jian <liujian56@huawei.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarSong Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20220416105801.88708-4-liujian56@huawei.com
parent 92ece280

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

0 → 100644
+45 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <test_progs.h>

#include <network_helpers.h>

#include "skb_load_bytes.skel.h"



void test_skb_load_bytes(void)

{

	struct skb_load_bytes *skel;

	int err, prog_fd, test_result;

	struct __sk_buff skb = { 0 };



	LIBBPF_OPTS(bpf_test_run_opts, tattr,

		.data_in = &pkt_v4,

		.data_size_in = sizeof(pkt_v4),

		.ctx_in = &skb,

		.ctx_size_in = sizeof(skb),

	);



	skel = skb_load_bytes__open_and_load();

	if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))

		return;



	prog_fd = bpf_program__fd(skel->progs.skb_process);

	if (!ASSERT_GE(prog_fd, 0, "prog_fd"))

		goto out;



	skel->bss->load_offset = (uint32_t)(-1);

	err = bpf_prog_test_run_opts(prog_fd, &tattr);

	if (!ASSERT_OK(err, "bpf_prog_test_run_opts"))

		goto out;

	test_result = skel->bss->test_result;

	if (!ASSERT_EQ(test_result, -EFAULT, "offset -1"))

		goto out;



	skel->bss->load_offset = (uint32_t)10;

	err = bpf_prog_test_run_opts(prog_fd, &tattr);

	if (!ASSERT_OK(err, "bpf_prog_test_run_opts"))

		goto out;

	test_result = skel->bss->test_result;

	if (!ASSERT_EQ(test_result, 0, "offset 10"))

		goto out;



out:

	skb_load_bytes__destroy(skel);

}

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

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+19 −0
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// SPDX-License-Identifier: GPL-2.0



#include <linux/bpf.h>

#include <bpf/bpf_helpers.h>



char _license[] SEC("license") = "GPL";



__u32 load_offset = 0;

int test_result = 0;



SEC("tc")

int skb_process(struct __sk_buff *skb)

{

	char buf[16];



	test_result = bpf_skb_load_bytes(skb, load_offset, buf, 10);



	return 0;

}