netdev - [resend] [PATCH] IPv4: Reset scope when changing address

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Date:	Sat, 16 Feb 2008 12:45:31 +0100
From:	Bjørn Mork <bjorn@...k.no>
To:	netdev@...r.kernel.org
Subject: [resend] [PATCH] IPv4: Reset scope when changing address

<#part type=text/plain nofile=yes>
Any comments on this?  Apparently introduced in 2.1.68, so there's not
much hurry.  But I'd still like to hear whether that analysis is correct
or not...
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="==-=-="

The bug did bite at least one user, who did have to resort to rebooting
the system after an "ifconfig eth0 127.0.0.1" typo.  

Deleting the address and adding a new is a less intrusive workaround.
But I still beleive this is a bug that should be fixed.  Some way or
another.

Another possibility would be to remove the scope mangling based on
address.  This will always be incomplete (are 127/8 the only address
space with host scope requirements?)

Bj��rn

<#part type=text/x-diff filename="devinet-rt_scope-fix.patch" disposition=inline nofile=yes>
We set the scope to RT_SCOPE_HOST if an IPv4 interface is configured
with a loopback address (127/8).  The scope is never reset, and will
remain set to RT_SCOPE_HOST after changing the address. This patch
resets the scope if the address is changed again, to restore normal
functionality.

Signed-off-by: Bjorn Mork <bjorn@...k.no>

--==-=-=

 devinet.c |    1 +
 1 file changed, 1 insertion(+)

--- linux-2.6.24-rc8.orig/net/ipv4/devinet.c	2008-01-16 05:22:48.000000000 +0100
+++ linux-2.6.24-rc8/net/ipv4/devinet.c	2008-01-23 19:17:30.000000000 +0100
@@ -753,6 +753,7 @@
 			inet_del_ifa(in_dev, ifap, 0);
 			ifa->ifa_broadcast = 0;
 			ifa->ifa_anycast = 0;
+			ifa->ifa_scope = 0;
 		}

 		ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;

--==-=-=
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--==-=-=--
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