50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2016 John Fastabend <john.r.fastabend@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include "vmlinux.h"
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#include "xdp_sample.bpf.h"
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#include "xdp_sample_shared.h"
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const volatile int ifindex_out;
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SEC("xdp")
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int xdp_redirect_prog(struct xdp_md *ctx)
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{
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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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u32 key = bpf_get_smp_processor_id();
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struct ethhdr *eth = data;
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struct datarec *rec;
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u64 nh_off;
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nh_off = sizeof(*eth);
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if (data + nh_off > data_end)
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return XDP_DROP;
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rec = bpf_map_lookup_elem(&rx_cnt, &key);
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if (!rec)
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return XDP_PASS;
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NO_TEAR_INC(rec->processed);
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swap_src_dst_mac(data);
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return bpf_redirect(ifindex_out, 0);
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}
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/* Redirect require an XDP bpf_prog loaded on the TX device */
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SEC("xdp")
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int xdp_redirect_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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char _license[] SEC("license") = "GPL";
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