1// SPDX-License-Identifier: GPL-2.0
2#include <linux/bpf.h>
3#include <bpf/bpf_helpers.h>
4
5struct {
6	__uint(type, BPF_MAP_TYPE_DEVMAP);
7	__uint(key_size, sizeof(__u32));
8	__uint(value_size, sizeof(struct bpf_devmap_val));
9	__uint(max_entries, 4);
10} dm_ports SEC(".maps");
11
12SEC("xdp")
13int xdp_redir_prog(struct xdp_md *ctx)
14{
15	return bpf_redirect_map(&dm_ports, 1, 0);
16}
17
18/* invalid program on DEVMAP entry;
19 * SEC name means expected attach type not set
20 */
21SEC("xdp")
22int xdp_dummy_prog(struct xdp_md *ctx)
23{
24	return XDP_PASS;
25}
26
27/* valid program on DEVMAP entry via SEC name;
28 * has access to egress and ingress ifindex
29 */
30SEC("xdp/devmap")
31int xdp_dummy_dm(struct xdp_md *ctx)
32{
33	char fmt[] = "devmap redirect: dev %u -> dev %u len %u\n";
34	void *data_end = (void *)(long)ctx->data_end;
35	void *data = (void *)(long)ctx->data;
36	unsigned int len = data_end - data;
37
38	bpf_trace_printk(fmt, sizeof(fmt),
39			 ctx->ingress_ifindex, ctx->egress_ifindex, len);
40
41	return XDP_PASS;
42}
43
44SEC("xdp.frags/devmap")
45int xdp_dummy_dm_frags(struct xdp_md *ctx)
46{
47	return XDP_PASS;
48}
49
50char _license[] SEC("license") = "GPL";
51