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// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
struct {
__uint(type, BPF_MAP_TYPE_DEVMAP);
__uint(key_size, sizeof(__u32));
__uint(value_size, sizeof(struct bpf_devmap_val));
__uint(max_entries, 4);
} dm_ports SEC(".maps");
SEC("xdp_redir")
int xdp_redir_prog(struct xdp_md *ctx)
{
return bpf_redirect_map(&dm_ports, 1, 0);
}
/* invalid program on DEVMAP entry;
* SEC name means expected attach type not set
*/
SEC("xdp_dummy")
int xdp_dummy_prog(struct xdp_md *ctx)
{
return XDP_PASS;
}
/* valid program on DEVMAP entry via SEC name;
* has access to egress and ingress ifindex
*/
SEC("xdp_devmap")
int xdp_dummy_dm(struct xdp_md *ctx)
{
char fmt[] = "devmap redirect: dev %u -> dev %u len %u\n";
void *data_end = (void *)(long)ctx->data_end;
void *data = (void *)(long)ctx->data;
unsigned int len = data_end - data;
bpf_trace_printk(fmt, sizeof(fmt),
ctx->ingress_ifindex, ctx->egress_ifindex, len);
return XDP_PASS;
}
char _license[] SEC("license") = "GPL";
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