Hello,
Thank you very much for your reply.
BIOCSSEESENT ioctl works fine with the Ethernet interface.
But this ioctl does not work for the 'tun' (user PPP of FreeBSD) device.
I have seen bpf code also. 'bpfioctl' function sets the d->bd_seesent flag to
the value which is passed for this BIOCSSEESENT.
In bpf_mtap also checks for this variable and ( m->m_pkthdr.rcvif == NULL )
As you had told in your earlier mail, the received interface is not null for
our case.
Any help on this would be greatly appreciated.
-Raj
--
On Wed, 6 Mar 2002 23:08:55 Robert Watson wrote:
>
>It could be that this fails for interfaces that perform hardware loopback,
>since it relies on the behavior of software loop. There may also be some
>other circumstances where this occurs. Basically, the BPF device can tell
>it's "locally sourced" because it has a NULL interface pointer associated
>with it. If the packet ends up with a none-NULL interface pointer for
>some reason, it will be considered a non-locally sourced packet. In
>practice, we've used this successfully on a variety of ethernet devices --
>which interface type are you using?
>
>Robert N M Watson FreeBSD Core Team, TrustedBSD Project
>[EMAIL PROTECTED] NAI Labs, Safeport Network Services
>
>On Wed, 6 Mar 2002, Rajesh P Jain wrote:
>
>> Hi,
>> In the BPF - Berkeley Packet Filter, when a file descriptor is associated to
>an interface to send and receive packets, there is an ioctl parameter "BIOCSSEESENT",
>which is by default set to 1. Hence the packets both from "remote systems" and
>"locally generated" are received.
>>
>> If "locally generated" packets needs to be filtered, we can use the option
>"BIOCSSEESENT" and set the value to 0.
>>
>> But even after setting this value to 0 (using the ioctl call), the "locally
>generated" packets are received.
>>
>> Am I missing something ? Plese throw light on this issue.
>>
>> TIA
>> Raj
>>
>>
>> Join 18 million Eudora users by signing up for a free Eudora Web-Mail account at
>http://www.eudoramail.com
>>
>> To Unsubscribe: send mail to [EMAIL PROTECTED]
>> with "unsubscribe freebsd-hackers" in the body of the message
>>
>
>
Join 18 million Eudora users by signing up for a free Eudora Web-Mail account at
http://www.eudoramail.com
To Unsubscribe: send mail to [EMAIL PROTECTED]
with "unsubscribe freebsd-hackers" in the body of the message
