1 /* Copyright (c) 2016 Facebook 1
2 *
3 * This program is free software; you can redi
4 * modify it under the terms of version 2 of t
5 * License as published by the Free Software F
6 */
7 #define KBUILD_MODNAME "foo"
8 #include <linux/ip.h>
9 #include <linux/ipv6.h>
10 #include <linux/in.h>
11 #include <linux/tcp.h>
12 #include <linux/udp.h>
13 #include <uapi/linux/bpf.h>
14 #include <bpf/bpf_helpers.h>
15 #include "bpf_legacy.h"
16
17 #define DEFAULT_PKTGEN_UDP_PORT 9
18 #define IP_MF 0x2000
19 #define IP_OFFSET 0x1FFF
20
21 static inline int ip_is_fragment(struct __sk_b
22 {
23 return load_half(ctx, nhoff + offsetof
24 & (IP_MF | IP_OFFSET);
25 }
26
27 SEC("ldabs")
28 int handle_ingress(struct __sk_buff *skb)
29 {
30 __u64 troff = ETH_HLEN + sizeof(struct
31
32 if (load_half(skb, offsetof(struct eth
33 return 0;
34 if (load_byte(skb, ETH_HLEN + offsetof
35 load_byte(skb, ETH_HLEN) != 0x45)
36 return 0;
37 if (ip_is_fragment(skb, ETH_HLEN))
38 return 0;
39 if (load_half(skb, troff + offsetof(st
40 return TC_ACT_SHOT;
41 return 0;
42 }
43 char _license[] SEC("license") = "GPL";
44
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