[Click] libpcap filter error

[Eddie Kohler]

Hi Daniel, Nick,

A-ha.  Click used to use Linux packet sockets whenever they were  
available.  But obviously it should offer the user a choice.  So now  
it does.  If you are using the anonymous CVS version, and you supply  
userlevel FromDevice with a "CAPTURE PCAP" argument, it will use pcap  
to capture packets (even on Linux).  Then BPF_FILTER will not be  
ignored.

(John, I think you'll be interested in this as well!)

Eddie


On Jun 29, 2005, at 2:10 PM, Nicholas Weaver wrote:

> On Wed, Jun 29, 2005 at 03:07:42PM -0600, Daniel Henkel composed:
>
>> Hi folks,
>>
>> I'm trying to use the BPF_FILTER parameter with FromDevice in
>> user-mode. This is the result when loading the configuration, e.g.,
>> /conf/wifi/pseudo-ibss.click:
>>
>> pseudo-ibss.click:33: While configuring 'from_dev :: FromDevice':
>>   warning: not using pcap library, BPF filter ignored
>>
>> I'm using libpcap 0.6.2, and ./configure recognizes it:
>> ...
>> checking for pcap.h... found
>> checking whether pcap.h works... yes
>> checking for bpf_timeval in pcap.h... no
>> checking whether pcap_setnonblock is declared... yes
>> checking for -lpcap... found
>> checking for pcap_setnonblock... yes
>> ...
>>
>
> I've not used BFP_Filter before, however...
>
> Click's linux code doesn't use pcap for the packet capturing, but it
> does under bsd (thus the check in ./configure).  I've experienced
> issues with the pcap driver under BSD however (the click linux driver
> is much more resilient).
>
> -- 
> Nicholas C. Weaver                                
> nweaver at icsi.berkeley.edu
>      This message has been ROT-13 encrypted twice for higher security.
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