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

// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include <network_helpers.h>

void test_xdp(void)
{
	struct vip key4 = {.protocol = 6, .family = AF_INET};
	struct vip key6 = {.protocol = 6, .family = AF_INET6};
	struct iptnl_info value4 = {.family = AF_INET};
	struct iptnl_info value6 = {.family = AF_INET6};
	const char *file = "./test_xdp.bpf.o";
	struct bpf_object *obj;
	char buf[128];
	struct ipv6hdr iph6;
	struct iphdr iph;
	int err, prog_fd, map_fd;
	LIBBPF_OPTS(bpf_test_run_opts, topts,
		.data_in = &pkt_v4,
		.data_size_in = sizeof(pkt_v4),
		.data_out = buf,
		.data_size_out = sizeof(buf),
		.repeat = 1,
	);

	err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd);
	if (CHECK_FAIL(err))
		return;

	map_fd = bpf_find_map(__func__, obj, "vip2tnl");
	if (map_fd < 0)
		goto out;
	bpf_map_update_elem(map_fd, &key4, &value4, 0);
	bpf_map_update_elem(map_fd, &key6, &value6, 0);

	err = bpf_prog_test_run_opts(prog_fd, &topts);
	memcpy(&iph, buf + sizeof(struct ethhdr), sizeof(iph));
	ASSERT_OK(err, "test_run");
	ASSERT_EQ(topts.retval, XDP_TX, "ipv4 test_run retval");
	ASSERT_EQ(topts.data_size_out, 74, "ipv4 test_run data_size_out");
	ASSERT_EQ(iph.protocol, IPPROTO_IPIP, "ipv4 test_run iph.protocol");

	topts.data_in = &pkt_v6;
	topts.data_size_in = sizeof(pkt_v6);
	topts.data_size_out = sizeof(buf);

	err = bpf_prog_test_run_opts(prog_fd, &topts);
	memcpy(&iph6, buf + sizeof(struct ethhdr), sizeof(iph6));
	ASSERT_OK(err, "test_run");
	ASSERT_EQ(topts.retval, XDP_TX, "ipv6 test_run retval");
	ASSERT_EQ(topts.data_size_out, 114, "ipv6 test_run data_size_out");
	ASSERT_EQ(iph6.nexthdr, IPPROTO_IPV6, "ipv6 test_run iph6.nexthdr");
out:
	bpf_object__close(obj);
}