projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 43b987d2 MV |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | // Copyright (c) 2018 Politecnico di Torino | |
| 3 | #include <stddef.h> | |
| 4 | #include <string.h> | |
| 5 | #include <linux/bpf.h> | |
| 6 | #include <linux/if_ether.h> | |
| 7 | #include <linux/ip.h> | |
| 8 | #include <linux/pkt_cls.h> | |
| 9 | #include "bpf_helpers.h" | |
| 10 | ||
| 11 | int _version SEC("version") = 1; | |
| 12 | ||
| 1639b17c AN |
13 | struct { |
| 14 | __uint(type, MAP_TYPE); | |
| 15 | __uint(max_entries, 32); | |
| 16 | __uint(map_flags, 0); | |
| 17 | __uint(key_size, 0); | |
| 18 | __uint(value_size, sizeof(__u32)); | |
| 19 | } map_in SEC(".maps"); | |
| 20 | ||
| 21 | struct { | |
| 22 | __uint(type, MAP_TYPE); | |
| 23 | __uint(max_entries, 32); | |
| 24 | __uint(map_flags, 0); | |
| 25 | __uint(key_size, 0); | |
| 26 | __uint(value_size, sizeof(__u32)); | |
| 27 | } map_out SEC(".maps"); | |
| 43b987d2 MV |
28 | |
| 29 | SEC("test") | |
| 30 | int _test(struct __sk_buff *skb) | |
| 31 | { | |
| 32 | void *data_end = (void *)(long)skb->data_end; | |
| 33 | void *data = (void *)(long)skb->data; | |
| 34 | struct ethhdr *eth = (struct ethhdr *)(data); | |
| 35 | __u32 value; | |
| 36 | int err; | |
| 37 | ||
| 38 | if (eth + 1 > data_end) | |
| 39 | return TC_ACT_SHOT; | |
| 40 | ||
| 41 | struct iphdr *iph = (struct iphdr *)(eth + 1); | |
| 42 | ||
| 43 | if (iph + 1 > data_end) | |
| 44 | return TC_ACT_SHOT; | |
| 45 | ||
| 46 | err = bpf_map_pop_elem(&map_in, &value); | |
| 47 | if (err) | |
| 48 | return TC_ACT_SHOT; | |
| 49 | ||
| 50 | iph->daddr = value; | |
| 51 | ||
| 52 | err = bpf_map_push_elem(&map_out, &iph->saddr, 0); | |
| 53 | if (err) | |
| 54 | return TC_ACT_SHOT; | |
| 55 | ||
| 56 | return TC_ACT_OK; | |
| 57 | } | |
| 58 | ||
| 59 | char _license[] SEC("license") = "GPL"; |