Hi
I tried to use ng_ether and ng_bpf as follows:
fxp0(lower) --- (bhook)[bpf](nomatch)(hook1)----(upper)fxp0
[ ]( match )(hook2)----not connected
$ ngctl mkpeer fxp0: bpf divert bhook
$ ngctl name fxp0:divert bpf0
$ ngctl
+ msg bpf0: setprogram { thisHook="bhook" ifMatch="hook2"
ifNotMatch="hook1" bpf_prog_len=1 bpf_prog=[ { code=6 } ] }
Now 'nghook -a bpf0: hook1' shows output while 'nghook -a bpf0: hook2'
doesn't.
$ ngctl connect fxp0: bpf0: upper hook1
1. After this I am unable to ping any of the lan machines.
Could you suggest what I could be doing wrong?
2. I am writing a BPF program(for filtering packets destined to particular
MAC addresses) by converting instructions like:
BPF_STMT(BPF_LD+BPF_H+BPF_ABS,12), BPF_STMT(BPF_RET+BPF_K,0)
into:
[ {code=28 jt=0 jf=0 k=0x0c} {code=6 jt=0 jf=0 k=0}]
After seeing the definitions of BPF_STMT,BPF_LD etc. in /sys/net/bpf.h. Is
this the correct way?
3. I noticed a problem that the filter could not be set as :
ngctl msg bpf0: setprogram {...}
It gave the message:
ngctl: send msg: Invalid argument
I am using FreeBSD 4.1.
Thanks
Satya
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