Divert sockets no longer behave like connected (SS_ISCONNECTED is removed from so->so_state)

From: Дмитрий Двойников (dvoinikov_at_kazna.ru)
Date: 12/16/04

  • Next message: John Angelmo: "NAT problem with public network" 
    Date: Thu, 16 Dec 2004 09:49:17 +0500
To: freebsd-net@freebsd.org

    Hello,

    I'm having this application (VPN daemon) which
    uses divert sockets for sending stuff http://www.targeted.org/nest/
    It worked fine under 5.3-RELEASE but broke after
    recent upgrade to FreeBSD 5.3-STABLE.

    An attempt to send() via divert socket now returns
    EDESTADDRREQ "Destination address required". Digging
    up the CVS revealed this:
    http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/ip_divert.c
    Quote:
    > Revision 1.98.2.1 / (download) - annotate - [select for diffs], Tue Nov 23 15:30:02 2004 UTC (3 weeks ago) by glebius
    > Branch: RELENG_5
    > - Since divert protocol is not connection oriented, remove SS_ISCONNECTED flag
    > from divert sockets.

    Also relevant is this message by Gleb Smirnoff:
    http://www.freebsd.org/cgi/getmsg.cgi?fetch=50544+0+/usr/local/www/db/text/2004/freebsd-net/20041121.freebsd-net
    Quote:
    > So, the real change suggested is to remove SS_ISCONNECTED from so->so_state. All
    > other changes are its logical consequences.
    > What was idea of that SS_ISCONNECTED flag always set? I can't find any problems we
    > can get by removing this code.

    Well, I'm having one - my application stopped working.

    Also, quote from man divert:

    > Packets are written as either incom-
    > ing or outgoing: if write(2) or send(2) is used to deliver the packet
    > ... skip ...
    > then the packet is treated as if it were outgoing

    My case exactly, but this no longer holds.

    What am I supposed to do now ? Modify my application ? Actually I already
    did that, by switching to sendto(), but just wanted to make sure this
    divert sockets semantics change is intented and not spontaneous.

    Sincerely,
    Dmitry Dvoinikov
    http://www.targeted.org/

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