MT_TAG removal

From: Sam Leffler (sam_at_errno.com)
Date: 12/12/03

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    To: arch@freebsd.org
Date: Fri, 12 Dec 2003 13:33:25 -0800

    http://people.freebsd.org/~sam/mt_tag.patch

    This set of changes eliminates the use of MT_TAG "pseudo mbufs", replacing
    them mostly with packet tags (one case is handled by using an mbuf flag since
    the linkage between "caller" and "callee" is direct and there's no need to
    incur the overhead of a packet tag).

    I've tested all these changes except for the PACKET_TAG_IPFORWARD stuff.

    Before I can commit this stuff I need to do more testing (help welcome) and
    need to evaluate the cost of doing multiple m_tag_find calls in the IP packet
    processing paths. I suspect we'll want to make this call first check if any
    tags exist before calling the code that does the actual list search.

    I'm looking for code review and general feedback. I especially like the way
    this cleans up divert sockets (in particular in the handling of fragments).

            Sam

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