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36 lines
1.5 KiB
36 lines
1.5 KiB
From: Olaf Kirch <okir@suse.de>
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Subject: Allow to bring up network interface w/o ipv6 autoconf
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References: bnc#161888
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Patch-mainline: no
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When bringing up a xen bridge device, it will always be configured to
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use a MAC address of ff:ff:ff:ff:ff:fe. This greatly confuses IPv6 DAD,
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which starts logging lots and lots of useless messages to syslog.
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We really want to disable IPv6 on these interfaces, and there doesn't
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seem to be a reliable way to do this without bringing the interface
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up first (and triggering IPv6 autoconf).
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This patch makes autoconf (DAD and router discovery) depend on the
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interface's ability to do multicast. Turning off multicast for an
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interface before bringing it up will suppress autoconfiguration.
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--- head-2011-02-08.orig/net/ipv6/addrconf.c 2011-02-08 09:51:53.000000000 +0100
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+++ head-2011-02-08/net/ipv6/addrconf.c 2011-02-08 10:00:00.000000000 +0100
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@@ -2848,6 +2848,7 @@ static void addrconf_dad_start(struct in
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goto out;
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if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
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+ !(dev->flags&IFF_MULTICAST) ||
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idev->cnf.accept_dad < 1 ||
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!(ifp->flags&IFA_F_TENTATIVE) ||
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ifp->flags & IFA_F_NODAD) {
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@@ -2951,6 +2952,7 @@ static void addrconf_dad_completed(struc
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ifp->idev->cnf.forwarding == 2) &&
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ifp->idev->cnf.rtr_solicits > 0 &&
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(dev->flags&IFF_LOOPBACK) == 0 &&
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+ (dev->flags&IFF_MULTICAST) &&
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(ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
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/*
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* If a host as already performed a random delay
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