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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758/* SPDX-License-Identifier: GPL-2.0 */// Copyright (c) 2018 Politecnico di Torino#include <stddef.h>#include <string.h>#include <linux/bpf.h>#include <linux/if_ether.h>#include <linux/ip.h>#include <linux/pkt_cls.h>#include <bpf/bpf_helpers.h>
struct { __uint(type, MAP_TYPE); __uint(max_entries, 32); __uint(map_flags, 0); __uint(key_size, 0); __uint(value_size, sizeof(__u32));} map_in SEC(".maps");
struct { __uint(type, MAP_TYPE); __uint(max_entries, 32); __uint(map_flags, 0); __uint(key_size, 0); __uint(value_size, sizeof(__u32));} map_out SEC(".maps");
SEC("tc")int _test(struct __sk_buff *skb){ void *data_end = (void *)(long)skb->data_end; void *data = (void *)(long)skb->data; struct ethhdr *eth = (struct ethhdr *)(data); __u32 value; int err;
if (eth + 1 > data_end) return TC_ACT_SHOT;
struct iphdr *iph = (struct iphdr *)(eth + 1);
if (iph + 1 > data_end) return TC_ACT_SHOT;
err = bpf_map_pop_elem(&map_in, &value); if (err) return TC_ACT_SHOT;
iph->daddr = value;
err = bpf_map_push_elem(&map_out, &iph->saddr, 0); if (err) return TC_ACT_SHOT;
return TC_ACT_OK;}
char _license[] SEC("license") = "GPL";