src/proto_ieee80211.c

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * By Daniel Borkmann <daniel@netsniff-ng.org>
   4  * Copyright 2012 Daniel Borkmann.
   5  * Subject to the GPL, version 2.
   6  */
   7
   8 #include <stdio.h>
   9 #include <stdint.h>
  10 #include <netinet/in.h>    /* for ntohs() */
  11 #include <asm/byteorder.h>
  12
  13 #include "proto.h"
  14 #include "protos.h"
  15 #include "dissector_80211.h"
  16 #include "built_in.h"
  17 #include "pkt_buff.h"
  18 #include "oui.h"
  19
  20 /* XXX: clarify which endianess */
  21
  22 struct ieee80211hdr {
  23 //      union {
  24 //              u16 frame_control;
  25 #if defined(__BIG_ENDIAN_BITFIELD)
  26                 __extension__ u16 subtype:4,
  27                                   type:2,
  28                                   proto_version:2,
  29                                   order:1,
  30                                   wep:1,
  31                                   more_data:1,
  32                                   power_mgmt:1,
  33                                   retry:1,
  34                                   more_frags:1,
  35                                   from_ds:1,
  36                                   to_ds:1;
  37 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  38                 __extension__ u16 proto_version:2,
  39                                   type:2,
  40                                   subtype:4,
  41                                   to_ds:1,
  42                                   from_ds:1,
  43                                   more_frags:1,
  44                                   retry:1,
  45                                   power_mgmt:1,
  46                                   more_data:1,
  47                                   wep:1,
  48                                   order:1;
  49 #else
  50 # error  "Adjust your <asm/byteorder.h> defines"
  51 #endif
  52 //      };
  53         u16 duration;
  54 } __packed;
  55
  56 static void ieee80211(struct pkt_buff *pkt)
  57 {
  58         struct ieee80211hdr *hdr =
  59                 (struct ieee80211hdr *) pkt_pull(pkt, sizeof(*hdr));
  60         if (hdr == NULL)
  61                 return;
  62
  63         tprintf(" [ 802.11 Frame Control (0x%x), Duration/ID (%u) ]\n",
  64                 0/*ntohs(hdr->frame_control)*/, /*ntohs(*/hdr->duration);
  65         tprintf("\t [ Proto Version (%u), ", hdr->proto_version);
  66         tprintf("Type (%u), ", hdr->type /*XXX*/);
  67         tprintf("Subtype (%u)", hdr->subtype /*XXX*/);
  68         tprintf("%s%s",
  69                 hdr->to_ds ? ", Frame goes to DS" : "",
  70                 hdr->from_ds ?  ", Frame comes from DS" : "");
  71         tprintf("%s", hdr->more_frags ? ", More Fragments" : "");
  72         tprintf("%s", hdr->retry ? ", Frame is retransmitted" : "");
  73         tprintf("%s", hdr->power_mgmt ? ", In Power Saving Mode" : "");
  74         tprintf("%s", hdr->more_data ? ", More Data" : "");
  75         tprintf("%s", hdr->wep ? ", Needs WEP" : "");
  76         tprintf("%s", hdr->order ? ", Order" : "");
  77         tprintf(" ]\n");
  78
  79 //      pkt_set_proto(pkt, &ieee802_lay2, ntohs(eth->h_proto));
  80 }
  81
  82 static void ieee80211_less(struct pkt_buff *pkt)
  83 {
  84         tprintf("802.11 frame (more on todo)");
  85 }
  86
  87 struct protocol ieee80211_ops = {
  88         .key = 0,
  89         .print_full = ieee80211,
  90         .print_less = ieee80211_less,
  91 };
  92
  93 EXPORT_SYMBOL(ieee80211_ops);