Contributors: 3
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Mauricio Vasquez B |
205 |
73.74% |
1 |
25.00% |
| Andrii Nakryiko |
72 |
25.90% |
2 |
50.00% |
| Toke Höiland-Jörgensen |
1 |
0.36% |
1 |
25.00% |
| Total |
278 |
|
4 |
|
/* 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";