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Linux/samples/bpf/parse_ldabs.c

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  1 /* Copyright (c) 2016 Facebook
  2  *
  3  * This program is free software; you can redistribute it and/or
  4  * modify it under the terms of version 2 of the GNU General Public
  5  * License as published by the Free Software Foundation.
  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_buff *ctx, __u64 nhoff)
 22 {
 23         return load_half(ctx, nhoff + offsetof(struct iphdr, frag_off))
 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 iphdr);
 31 
 32         if (load_half(skb, offsetof(struct ethhdr, h_proto)) != ETH_P_IP)
 33                 return 0;
 34         if (load_byte(skb, ETH_HLEN + offsetof(struct iphdr, protocol)) != IPPROTO_UDP ||
 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(struct udphdr, dest)) == DEFAULT_PKTGEN_UDP_PORT)
 40                 return TC_ACT_SHOT;
 41         return 0;
 42 }
 43 char _license[] SEC("license") = "GPL";
 44 

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