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Date: Mon, 6 May 1996 10:42:15 -0700 (PDT)
From: Garrett Wollman <wollman>
Message-Id: <199605061742.KAA27207@freefall.freebsd.org>
To: CVS-committers, cvs-all, cvs-sys
Subject: cvs commit:  src/sys/netinet in_rmx.c ip_output.c src/sys/net route.h
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wollman     96/05/06 10:42:15

  Modified:    sys/net   route.h
               sys/netinet  in_rmx.c ip_output.c
  Log:
  Add three new route flags to help determine what sort of address
  the destination represents.  For IP:
  
  - Iff it is a host route, RTF_LOCAL and RTF_BROADCAST indicate local
    (belongs to this host) and broadcast addresses, respectively.
  
  - For all routes, RTF_MULTICAST is set if the destination is multicast.
  
  The RTF_BROADCAST flag is used by ip_output() to eliminate a call to
  in_broadcast() in a common case; this gives about 1% in our packet-generation
  experiments.  All three flags might be used (although they aren't now)
  to determine whether a packet can be forwarded; a given host route can
  represent a forwardable address if:
  
  	(rt->rt_flags & (RTF_HOST | RTF_LOCAL | RTF_BROADCAST | RTF_MULTICAST))
  	== RTF_HOST
  
  Obviously, one still has to do all the work if a host route is not present,
  but this code allows one to cache the results of such a lookup if rtalloc1()
  is called without masking RTF_PRCLONING.
  
  Revision  Changes    Path
  1.21      +5 -2      src/sys/net/route.h
  1.25      +33 -4     src/sys/netinet/in_rmx.c
  1.37      +10 -5     src/sys/netinet/ip_output.c