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Linux/samples/bpf/parse_simple.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 <net/ip.h>
 15 #include <bpf/bpf_helpers.h>
 16 
 17 #define DEFAULT_PKTGEN_UDP_PORT 9
 18 
 19 /* copy of 'struct ethhdr' without __packed */
 20 struct eth_hdr {
 21         unsigned char   h_dest[ETH_ALEN];
 22         unsigned char   h_source[ETH_ALEN];
 23         unsigned short  h_proto;
 24 };
 25 
 26 SEC("simple")
 27 int handle_ingress(struct __sk_buff *skb)
 28 {
 29         void *data = (void *)(long)skb->data;
 30         struct eth_hdr *eth = data;
 31         struct iphdr *iph = data + sizeof(*eth);
 32         struct udphdr *udp = data + sizeof(*eth) + sizeof(*iph);
 33         void *data_end = (void *)(long)skb->data_end;
 34 
 35         /* single length check */
 36         if (data + sizeof(*eth) + sizeof(*iph) + sizeof(*udp) > data_end)
 37                 return 0;
 38 
 39         if (eth->h_proto != htons(ETH_P_IP))
 40                 return 0;
 41         if (iph->protocol != IPPROTO_UDP || iph->ihl != 5)
 42                 return 0;
 43         if (ip_is_fragment(iph))
 44                 return 0;
 45         if (udp->dest == htons(DEFAULT_PKTGEN_UDP_PORT))
 46                 return TC_ACT_SHOT;
 47         return 0;
 48 }
 49 char _license[] SEC("license") = "GPL";
 50 

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