There are a few potential failure modes when adding an IPv6 address.
It takes a little while of duplicate address detection to complete, so
wait for a while. After a timeout, also need to check to see if
duplicate address detection failed - if it did then actually drop the
IP address.
This really needs some careful thinking. If CTDB disappears on a node
but the node's IP addresses are still on interfaces then the above
failure mode could cause the takeover nodes to become banned.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
echo "Failed to add $_ip/$_maskbits on dev $_iface"
return 1
}
+
+ # Wait 5 seconds for IPv6 addresses to stop being tentative...
+ if [ -z "$_bcast" ] ; then
+ for _x in $(seq 1 10) ; do
+ ip addr show to "${_ip}/128" | grep -q "tentative" || break
+ sleep 0.5
+ done
+
+ # If the address was a duplicate then it won't be on the
+ # interface so flag an error.
+ _t=$(ip addr show to "${_ip}/128")
+ case "$_t" in
+ "")
+ echo "Failed to add $_ip/$_maskbits on dev $_iface"
+ return 1
+ ;;
+ *tentative*|*dadfailed*)
+ echo "Failed to add $_ip/$_maskbits on dev $_iface"
+ ip addr del "$_ip/$_maskbits" dev "$_iface"
+ return 1
+ ;;
+ esac
+ fi
}
delete_ip_from_iface()