In the Wi-SUN packet filters there are some information elements (IEs) with
common/reused field names.
In the example tree below the US-IE and BS-IE both have Dwell Interval,
Clock Drift, Timing Accuracy, Channel Control, Regulatory Domain, and
Channel Plan ID.
The header_field_info for those fields were created using a
[FIELDFILTERNAME] starting with wisun.usie.* and the dissector reused the
same hfindex when adding the tree item to the different IE trees.
Some automated testing using the Python pyshark library would like to parse
out those fields by the IE it appears in. So the filtername
wisun.usie.dwell would change to wisun.bsie.dwell.
There is also a LCP-IE which also has the same fields.
Can someone direct me to a way (or the recommended way) to modify the
dissector to improve the filtering and correct the field names without
creating duplicate hf table entries for every variant?
Thanks,
James
Payload IEs, Wi-SUN Payload IE
Wi-SUN Payload IE
IE Header: 0xa040, Type: Payload, Id: Wi-SUN IE, Length: 64
Unicast Schedule IE
Wi-SUN Sub IE: 0x8806, Type: Long, Sub ID: Unicast Schedule IE
Dwell Interval: 100ms
Clock Drift: Not provided (255)
Timing Accuracy: 2.55ms
Channel Control: 0x12, Channel Plan: Regulatory Domain and
Channel Plan ID, Channel Function: Direct Hash Channel Function, Excluded
Channels: None
.... .010 = Channel Plan: Regulatory Domain and Channel
Plan ID (2)
..01 0... = Channel Function: Direct Hash Channel Function
(2)
00.. .... = Excluded Channels: None (0)
Regulatory Domain: North America (1)
Channel Plan ID: 902_928_400 (2)
BS-IE
Wi-SUN Sub IE: 0x900c, Type: Long, Sub ID: Broadcast Schedule IE
Broadcast Interval: 200ms
Broadcast Schedule ID: 61243
Dwell Interval: 40ms
Clock Drift: Not provided (255)
Timing Accuracy: 2.55ms
Channel Control: 0x12, Channel Plan: Regulatory Domain and
Channel Plan ID, Channel Function: Direct Hash Channel Function, Excluded
Channels: None
.... .010 = Channel Plan: Regulatory Domain and Channel
Plan ID (2)
..01 0... = Channel Function: Direct Hash Channel Function
(2)
00.. .... = Excluded Channels: None (0)
Regulatory Domain: North America (1)
Channel Plan ID: 902_928_400 (2)
PAN Version IE
GTK Hash IE
PAN Version IE
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