xdp_redirect.bpf.c (1335B)
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";