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Patrick McHardy kaber at trash.netOn 24.11.2010 13:50, Patrick McHardy wrote: > On 23.11.2010 23:32, Erik Tews wrote: >> Hi >> >> I spotted two small problems with libpcap: >> >> * Preables for received PP frames are missing, the dedected.org >> tools used to include the preamble as well. This can easily be >> fixed by adding a default preamble if the kernel doesn't report >> the preamble to the userspace. > > I guess the kernel should report it, at least with double simplex > bearers the sender can't be determined based on the slot number. > >> * The slottime wraps around at 2^12 and not at 2^11 as it used to >> wrap around with the dedected.org tools. I am not sure about the >> best solution here, one could also use the full 16 bits for the >> time which are available in the header. > > I'm not sure what you're referring to here. The slot numbers are in > the range of 0-23. > > Generally I think the header format should be revamped: > > - we don't need the fake ethernet addresses > - the preamble should use 5 bytes for the case of a prolonged > preamble > - the RSSI shouldn't use the raw COA values but defined units > - the multiframe number should be added > - the RF-band and/or specific frequency should be added. Using > the RF-band is probably the more flexible way. > - drift for received packets could be added One more thing - for good measure we should also somehow indicate whether/which half slots are used, the slot number alone is not enough for that. > > additionally we could optionally ignore S-field errors in the driver > and indicate them in the frame header. > > The easiest way to make these changes is probably to add a new > link type for the new header and have wireshark etc. deal with > that. >