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Date:      Mon, 16 Dec 2002 03:39:48 -0800 (PST)
From:      Svetoslav Agafonkin <agius2@yahoo.com>
To:        freebsd-net@freebsd.org
Subject:   RTF_CLONING and RTF_WASCLONED flags - cloning mechanisum question
Message-ID:  <20021216113948.382.qmail@web21205.mail.yahoo.com>

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   flober# uname -a
   FreeBSD flober 4.7-RELEASE FreeBSD 4.7-RELEASE #5:
Thu Dec  5 22:01:28 EET 2002
   root@flober:/usr/obj/usr/src/sys/AKERNEL  i386

  I've got this question about flags C (RTF_CLONING)
and W (RTF_WASCLONED)(struct rtentry):

  Let there are two active interfaces - fxp0
(ethernet) i lo0 (loopback):

   flober# ifconfig

   fxp0:
flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu
1500
         inet 192.168.1.1 netmask 0xffffff00 broadcast
192.168.1.255
         ether 00:06:29:b0:df:65
         media: Ethernet autoselect (none)
         status: no carrier
   lp0: flags=8810<POINTOPOINT,SIMPLEX,MULTICAST> mtu
1500
   ppp0: flags=8010<POINTOPOINT,MULTICAST> mtu 1500
   sl0: flags=c010<POINTOPOINT,LINK2,MULTICAST> mtu
552
   faith0: flags=8002<BROADCAST,MULTICAST> mtu 1500
   lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu
16384
        inet 127.0.0.1 netmask 0xff000000


 initial routing table :

   flober# netstat -rn
   Routing tables

   Internet:
   Destination        Gateway            Flags    Refs
     Use  Netif Expire
   127.0.0.1          127.0.0.1          UH          0
       0    lo0
   192.168.1          link#1             UC          0
       0   fxp0

the flag C in the entry route to 192.168.1.0/24 means
that every time we use that entry (via
rtalloc/rtrequest/rtrequest_ign(/sys/net/route.c)) it
will be  cloned (i.e. a new entry will be created
using the old a a template).Let's see:

 for example:

  flober# ping 192.168.1.1

   ...

  flober# netstat -rn
  Routing tables

  Internet:
  Destination        Gateway            Flags Refs    
 Use  Netif Expire
  127.0.0.1          127.0.0.1          UH          0 
      0    lo0
  192.168.1          link#1             UC          1 
      0   fxp0
  192.168.1.1        00:06:29:b0:df:65  UHLW        0 
      4    lo0

How fxp0 interface is changed to lo0? Where exactly in
the source (rtrequest)this is done?


Svetoslav Agafonkin




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