src/patches/60003_ipv6-no-autoconf.patch1

   1 From: Olaf Kirch <okir@suse.de>
   2 Subject: Allow to bring up network interface w/o ipv6 autoconf
   3 References: 161888
   4
   5 When bringing up a xen bridge device, it will always be configured to
   6 use a MAC address of ff:ff:ff:ff:ff:fe.  This greatly confuses IPv6 DAD,
   7 which starts logging lots and lots of useless messages to syslog.
   8
   9 We really want to disable IPv6 on these interfaces, and there doesn't
  10 seem to be a reliable way to do this without bringing the interface
  11 up first (and triggering IPv6 autoconf).
  12
  13 This patch makes autoconf (DAD and router discovery) depend on the
  14 interface's ability to do multicast. Turning off multicast for an
  15 interface before bringing it up will suppress autoconfiguration.
  16
  17  net/ipv6/addrconf.c |    2 ++
  18  1 files changed, 2 insertions(+)
  19
  20 Index: head-2008-09-25/net/ipv6/addrconf.c
  21 ===================================================================
  22 --- head-2008-09-25.orig/net/ipv6/addrconf.c    2008-09-25 13:56:12.000000000 +0200
  23 +++ head-2008-09-25/net/ipv6/addrconf.c 2008-09-25 14:15:19.000000000 +0200
  24 @@ -2781,6 +2781,7 @@ static void addrconf_dad_start(struct in
  25         spin_lock_bh(&ifp->lock);
  26
  27         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
  28 +           !(dev->flags&IFF_MULTICAST) ||
  29             idev->cnf.accept_dad < 1 ||
  30             !(ifp->flags&IFA_F_TENTATIVE) ||
  31             ifp->flags & IFA_F_NODAD) {
  32 @@ -2878,6 +2879,7 @@ static void addrconf_dad_completed(struc
  33         if (ifp->idev->cnf.forwarding == 0 &&
  34             ifp->idev->cnf.rtr_solicits > 0 &&
  35             (dev->flags&IFF_LOOPBACK) == 0 &&
  36 +           (dev->flags & IFF_MULTICAST) &&
  37             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
  38                 /*
  39                  *      If a host as already performed a random delay