Re: strange messages from -current 'dhcpcd'

[Roy Marples <roy%marples.name@localhost>]

On Saturday 25 June 2016 07:41:19 Paul Goyette wrote:
> On Fri, 24 Jun 2016, Michael van Elst wrote:
> > jdbaker%mylinuxisp.com@localhost ("John D. Baker") writes:
> >> Jun 18 12:56:53 hostname dhcpcd[PID]: wm0: invalid UDP packet from
> >> 19.100.192.168 Jun 18 12:56:53 hostname dhcpcd[PID]: wm0: invalid UDP
> >> packet from 20.12.192.168 Jun 18 14:15:22 hostname dhcpcd[PID]: wm0:
> >> invalid UDP packet from 119.16.192.168 Jun 23 21:48:35 hostname
> >> dhcpcd[PID]: wm0: invalid UDP packet from 150.129.192.168 Jun 23
> >> 18:57:32 hostname dhcpcd[PID]: wm0: invalid UDP packet from
> >> 163.85.192.168 Jun 24 02:56:29 hostname dhcpcd[PID]: wm0: invalid UDP
> >> packet from 76.24.192.168
> >> 
> >> Needless to say, the purported source IPs are not on my network.
> > 
> > Obviously these are not IP addresses. Each ends with 192.168, so there
> > is a off-by-2 error when accessing the address field.
> 
> Or some strange byte/word swap error...

Or probably a bug with the BPF reader being re-worked so it was interruptible.
I think it's due to BPF queue having >1 packet.

I'll look into fixing it, it happens very occasionally on my dev machine, but 
my network is small so it's hard to reproduce.

Roy