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The Parser is lacking fields which were only recently added to the spec, like tlv and eht.

Hi All,

I am planning to create a ieee 802.11 packet RadioTap parsing code/library. Decoding each and every field.

Meanwhile, before asking [did my homework] of going through source code and found the following.

[1] Compared to Wireshark library, RadioTap header files are NOT updated in radiotap-library.
[2] Also in the function "print_radiotap_namespace" in parse.c, is it User expected to fill in all the details and process the fields further?
[3] What other alternatives do I have in processing radiotap header [write own code using radiotap files as reference] or is there any other library/source code which can help me

Thanks

Hi, I have a question about the meaning of the "accuracy" field in the Radiotap header. It's not clearly explained on the webpage.
For instance, in the timestamp field, the unit is "usec" and the "accuracy" is "22", what's the meaning of such a value 22?
In addition, is there any way to set the accuracy as a nanosecond? E.g. modifying the driver?

On https://github.com/radiotap/radiotap-library/blob/master/radiotap.c#L222, there should be a second 'n' in 'endianess'.

Credit goes to @HairyFotr for finding the typo.

Am i doing something wrong ? : see below

     case IEEE80211_RADIOTAP_CHANNEL:
       printf("\tchannel frequency: %d\n", (u_int16_t)*iter->this_arg);
       break;

I am getting :

    channel frequency: 128

radiotap.c: In function ‘ieee80211_radiotap_iterator_init’:
radiotap.c:167:27: warning: taking address of packed member of ‘struct ieee80211_radiotap_header’ may result in an unaligned pointer value [-Waddress-of-packed-member]
167 | iterator->_next_bitmap = &radiotap_header->it_present;
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

  this code is included in openwifi its give me above error
  radiotap.c: In function ‘ieee80211_radiotap_iterator_init’:

radiotap.c:167:27: warning: taking address of packed member of ‘struct ieee80211_radiotap_header’ may result in an unaligned pointer value [-Waddress-of-packed-member]
167 | iterator->_next_bitmap = &radiotap_header->it_present;
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Hello,
I cannot find any sources online on how to calculate the mcs_index given the IEEE80211_RADIOTAP_MCS param.
To clarify my issue:
If I want to calculate the bandwidth for example, radiotap.h neatly defines IEEE80211_RADIOTAP_MCS_BW_MASK
So I can just use bandwidth= param & IEEE80211_RADIOTAP_MCS_BW_MASK;
However, there is no such field for the mcs index.
Aka EEE80211_RADIOTAP_MCS_MCS_MASK
What would I have to use for XXX in this sense
mcs_index= param & XXX;