github.phpd.cn/cilium/cilium@v1.6.12/bpf/bpf_hostdev_ingress.c (about) 1 /* 2 * Copyright (C) 2019 Authors of Cilium 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 #include <linux/if_packet.h> 19 20 #include <node_config.h> 21 #include <netdev_config.h> 22 #include <bpf/api.h> 23 24 #include <stdint.h> 25 #include <stdio.h> 26 27 #include "lib/common.h" 28 29 __section("to-host") 30 int to_host(struct __sk_buff *skb) 31 { 32 // Upper 16 bits may carry proxy port number, clear it out 33 __u32 magic = skb->cb[0] & 0xFFFF; 34 if (magic == MARK_MAGIC_TO_PROXY) { 35 skb->mark = skb->cb[0]; 36 skb->cb[0] = 0; 37 } 38 return TC_ACT_OK; 39 } 40 41 BPF_LICENSE("GPL");