src/proto_ipv6.h

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * By Daniel Borkmann <daniel@netsniff-ng.org>
   4  * Copyright 2009, 2010 Daniel Borkmann.
   5  * Copyright 2010 Emmanuel Roullit.
   6  * Subject to the GPL, version 2.
   7  */
   8
   9 #ifndef IPV6_H
  10 #define IPV6_H
  11
  12 #include <stdio.h>
  13 #include <stdint.h>
  14 #include <netinet/in.h>    /* for ntohs() */
  15 #include <arpa/inet.h>     /* for inet_ntop() */
  16 #include <asm/byteorder.h>
  17
  18 #include "csum.h"
  19 #include "proto_struct.h"
  20 #include "dissector_eth.h"
  21 #include "pkt_buff.h"
  22
  23 /*
  24  * IPv6 fixed header
  25  *
  26  * BEWARE, it is incorrect. The first 4 bits of flow_lbl
  27  * are glued to priority now, forming "class".
  28  */
  29 struct ipv6hdr {
  30 #if defined(__LITTLE_ENDIAN_BITFIELD)
  31         __extension__ uint8_t priority:4,
  32                               version:4;
  33 #elif defined(__BIG_ENDIAN_BITFIELD)
  34         __extension__ uint8_t version:4,
  35                               priority:4;
  36 #else
  37 # error "Please fix <asm/byteorder.h>"
  38 #endif
  39         uint8_t flow_lbl[3];
  40         uint16_t payload_len;
  41         uint8_t nexthdr;
  42         uint8_t hop_limit;
  43         struct in6_addr saddr;
  44         struct in6_addr daddr;
  45 } __attribute__((packed));
  46
  47 static inline void ipv6(struct pkt_buff *pkt)
  48 {
  49         uint8_t traffic_class;
  50         uint32_t flow_label;
  51         char src_ip[INET6_ADDRSTRLEN];
  52         char dst_ip[INET6_ADDRSTRLEN];
  53         struct ipv6hdr *ip = (struct ipv6hdr *) pkt_pull(pkt, sizeof(*ip));
  54
  55         if (ip == NULL)
  56                 return;
  57
  58         traffic_class = (ip->priority << 4) |
  59                         ((ip->flow_lbl[0] & 0xF0) >> 4);
  60         flow_label = ((ip->flow_lbl[0] & 0x0F) << 8) |
  61                      (ip->flow_lbl[1] << 4) | ip->flow_lbl[2];
  62
  63         inet_ntop(AF_INET6, &ip->saddr, src_ip, sizeof(src_ip));
  64         inet_ntop(AF_INET6, &ip->daddr, dst_ip, sizeof(dst_ip));
  65
  66         tprintf(" [ IPv6 ");
  67         tprintf("Addr (%s => %s), ", src_ip, dst_ip);
  68         tprintf("Version (%u), ", ip->version);
  69         tprintf("TrafficClass (%u), ", traffic_class);
  70         tprintf("FlowLabel (%u), ", flow_label);
  71         tprintf("Len (%u), ", ntohs(ip->payload_len));
  72         tprintf("NextHdr (%u), ", ip->nexthdr);
  73         tprintf("HopLimit (%u)", ip->hop_limit);
  74         tprintf(" ]\n");
  75
  76         pkt_set_proto(pkt, &eth_lay3, ip->nexthdr);
  77 }
  78
  79 static inline void ipv6_less(struct pkt_buff *pkt)
  80 {
  81         char src_ip[INET6_ADDRSTRLEN];
  82         char dst_ip[INET6_ADDRSTRLEN];
  83         struct ipv6hdr *ip = (struct ipv6hdr *) pkt_pull(pkt, sizeof(*ip));
  84
  85         if (ip == NULL)
  86                 return;
  87
  88         inet_ntop(AF_INET6, &ip->saddr, src_ip, sizeof(src_ip));
  89         inet_ntop(AF_INET6, &ip->daddr, dst_ip, sizeof(dst_ip));
  90
  91         tprintf(" %s/%s Len %u", src_ip, dst_ip,
  92                 ntohs(ip->payload_len));
  93
  94         pkt_set_proto(pkt, &eth_lay3, ip->nexthdr);
  95 }
  96
  97 struct protocol ipv6_ops = {
  98         .key = 0x86DD,
  99         .print_full = ipv6,
 100         .print_less = ipv6_less,
 101 };
 102
 103 #endif /* IPV6_H */