test_xdp_devmap_helpers.c

 1// SPDX-License-Identifier: GPL-2.0
 2/* fails to load without expected_attach_type = BPF_XDP_DEVMAP
 3 * because of access to egress_ifindex
 4 */
 5#include <linux/bpf.h>
 6#include <bpf/bpf_helpers.h>
 7
 8SEC("xdp")
 9int xdpdm_devlog(struct xdp_md *ctx)
10{
11	char fmt[] = "devmap redirect: dev %u -> dev %u len %u\n";
12	void *data_end = (void *)(long)ctx->data_end;
13	void *data = (void *)(long)ctx->data;
14	unsigned int len = data_end - data;
15
16	bpf_trace_printk(fmt, sizeof(fmt),
17			 ctx->ingress_ifindex, ctx->egress_ifindex, len);
18
19	return XDP_PASS;
20}
21
22char _license[] SEC("license") = "GPL";