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40 lines
1.6 KiB
Plaintext
40 lines
1.6 KiB
Plaintext
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: 161888
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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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net/ipv6/addrconf.c | 2 ++
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1 files changed, 2 insertions(+)
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Index: head-2008-09-25/net/ipv6/addrconf.c
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===================================================================
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--- head-2008-09-25.orig/net/ipv6/addrconf.c 2008-09-25 13:56:12.000000000 +0200
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+++ head-2008-09-25/net/ipv6/addrconf.c 2008-09-25 14:15:19.000000000 +0200
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@@ -2781,6 +2781,7 @@ static void addrconf_dad_start(struct in
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spin_lock_bh(&ifp->lock);
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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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@@ -2878,6 +2879,7 @@ static void addrconf_dad_completed(struc
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if (ifp->idev->cnf.forwarding == 0 &&
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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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