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