[Bro-Dev] [JIRA] (BIT-1363) Clustered AF_PACKET support

Michal Purzynski (JIRA) jira at bro-tracker.atlassian.net
Tue Sep 8 21:06:00 PDT 2015

    [ https://bro-tracker.atlassian.net/browse/BIT-1363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=22012#comment-22012 ] 

Michal Purzynski commented on BIT-1363:

I'm trying to understand now how Bro uses the libpcap and I'm reading the libpcap source at the same time.

PcapSource::OpenLive() calls pcap_create() and pcap_activate() later, which in turn, inside libpcap calls pcap_activate_linux() that tries hard to use mmap() and TPACKET_V3. Cool :-)

A lot of magic happens after but libpcap is really good in autodetection - granted that you use it like designed, and not pick and choose functions. So we are good here.

A documentation piece would be nice, that would recommend kernel at least 3.13 and libpcap 1.6 (or even 1.5). Maybe it will work on RHEL 7 stone-age-old 3.10.

> Clustered AF_PACKET support
> ---------------------------
>                 Key: BIT-1363
>                 URL: https://bro-tracker.atlassian.net/browse/BIT-1363
>             Project: Bro Issue Tracker
>          Issue Type: New Feature
>          Components: Bro
>    Affects Versions: git/master
>            Reporter: Michal Purzynski
> Let's have a support for packet capture with the AF_PACKET sockets in multi worker configuration.
> Bro can use a single worker with af_packet, I have tested and it works, but having a direct support for multi-worker load balancing would allow to avoid the pf_ring for many deployments with the traffic level where DNA / ZC / Myricom / DAG is not required.

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