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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Intel */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "xsk_xdp_metadata.h"
struct {
__uint(type, BPF_MAP_TYPE_XSKMAP);
__uint(max_entries, 1);
__uint(key_size, sizeof(int));
__uint(value_size, sizeof(int));
} xsk SEC(".maps");
static unsigned int idx;
int count = 0;
SEC("xdp") int xsk_def_prog(struct xdp_md *xdp)
{
return bpf_redirect_map(&xsk, 0, XDP_DROP);
}
SEC("xdp") int xsk_xdp_drop(struct xdp_md *xdp)
{
/* Drop every other packet */
if (idx++ % 2)
return XDP_DROP;
return bpf_redirect_map(&xsk, 0, XDP_DROP);
}
SEC("xdp") int xsk_xdp_populate_metadata(struct xdp_md *xdp)
{
void *data, *data_meta;
struct xdp_info *meta;
int err;
/* Reserve enough for all custom metadata. */
err = bpf_xdp_adjust_meta(xdp, -(int)sizeof(struct xdp_info));
if (err)
return XDP_DROP;
data = (void *)(long)xdp->data;
data_meta = (void *)(long)xdp->data_meta;
if (data_meta + sizeof(struct xdp_info) > data)
return XDP_DROP;
meta = data_meta;
meta->count = count++;
return bpf_redirect_map(&xsk, 0, XDP_DROP);
}
char _license[] SEC("license") = "GPL";
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