Re: udp checksum on raw sockets

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

  • Next message: Steven N. Fettig: "Load Balanced Dual T1's - Same default gateway for both CSU/DSU's?" 
    Date: Tue, 27 Apr 2004 23:16:39 +0200
To: Ruslan Ermilov <ru@freebsd.org>

    Hi,

    On Tue, Apr 27, 2004 at 10:05:43PM +0300, Ruslan Ermilov wrote:
    > Have the raw IP code set csum_flags |= CSUM_UDP (and set csum_data
    > correctly) in m->m_pkthdr, if ip_p == IPPROTO_UDP && uh_csum == 0.
    > Do the same thing for IPPROTO_TCP.

    Like I said, I'm willing to tackle this in the kernel, but for now I also
    need a userland-only solution.

    I guess I can fetch the IP address from the first ethernet iface and use
    that as the src address for the IP packet.

    Then I have enough information to calculate the UDP checksum in userland,
    don't I?

    Thanks

    Mark
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