udp checksum on raw sockets

From: Mark Santcroos (marks_at_ripe.net)
Date: 04/27/04

  • Next message: Charles Swiger: "Re: udp checksum on raw sockets" 
    Date: Tue, 27 Apr 2004 18:09:01 +0200
To: net@freebsd.org

    * I'm sending UDP packets on a raw socket.

    * iphdr->ip_src.s_addr = INADDR_ANY;
      So I don't know the IP address that will be used as src address.
      So as far as I can see, I have a problem generating the checksum in
      userspace.

    Suggestion:

    Would it make sense that if:
    sysctl net.udp.checksum=1
    and
    udphdr->uh_sum = 0;
    in a UDP packet created on a raw socket, to do the checksum in the kernel
    instead of leaving it zero? If it does, I can create a patch.

    Any other hints as how to do the checksum in userland are welcome too. As
    that is the "ultimate" problem I try to fix.

    Thanks

    Mark
    _______________________________________________
    freebsd-net@freebsd.org mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-net
    To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"

  • Next message: Charles Swiger: "Re: udp checksum on raw sockets"