1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright (c) 2016 John Fastabend <john.r.fastabend@intel.com>
 3 *
 4 * This program is free software; you can redistribute it and/or
 5 * modify it under the terms of version 2 of the GNU General Public
 6 * License as published by the Free Software Foundation.
 7 *
 8 * This program is distributed in the hope that it will be useful, but
 9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 */
13#include "vmlinux.h"
14#include "xdp_sample.bpf.h"
15#include "xdp_sample_shared.h"
16
17const volatile int ifindex_out;
18
19SEC("xdp")
20int xdp_redirect_prog(struct xdp_md *ctx)
21{
22	void *data_end = (void *)(long)ctx->data_end;
23	void *data = (void *)(long)ctx->data;
24	u32 key = bpf_get_smp_processor_id();
25	struct ethhdr *eth = data;
26	struct datarec *rec;
27	u64 nh_off;
28
29	nh_off = sizeof(*eth);
30	if (data + nh_off > data_end)
31		return XDP_DROP;
32
33	rec = bpf_map_lookup_elem(&rx_cnt, &key);
34	if (!rec)
35		return XDP_PASS;
36	NO_TEAR_INC(rec->processed);
37
38	swap_src_dst_mac(data);
39	return bpf_redirect(ifindex_out, 0);
40}
41
42/* Redirect require an XDP bpf_prog loaded on the TX device */
43SEC("xdp")
44int xdp_redirect_dummy_prog(struct xdp_md *ctx)
45{
46	return XDP_PASS;
47}
48
49char _license[] SEC("license") = "GPL";