ipfw on just inbound and not outbound

[hiren panchasara]

On 05/21/15 at 12:42P, hiren panchasara wrote:
> Getting back to this now to see if I can avoid ipfw on outgoing packets.
> 
> @@ -500,7 +507,7 @@ ipfw_hook(int onoff, int pf)
>         hook_func = (pf == AF_LINK) ? ipfw_check_frame : ipfw_check_packet;
>  
>         (void) (onoff ? pfil_add_hook : pfil_remove_hook)
> -           (hook_func, NULL, PFIL_IN | PFIL_OUT | PFIL_WAITOK, pfh);
> +           (hook_func, NULL, PFIL_IN | PFIL_WAITOK, pfh);
>  
>         return 0;
> }
> 
> Should this do the right thing? I'll report back once I test this patch.

I am still seeing ipfw_chk() getting called in my iperf test. Now, if I
also remove PFIL_IN, i.e if I do:
-           (hook_func, NULL, PFIL_IN | PFIL_OUT | PFIL_WAITOK, pfh);
+           (hook_func, NULL, PFIL_WAITOK, pfh);

I don't see ipfw_chk() getting triggered. 

Somehow incoming traffic is affecting the outgoing traffic?

I'd appreciate any inputs/thoughts. I'll keep poking at this.

Cheers,
Hiren
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