ipv6: ip6mr: move unres_queue and timer to per-namespace data

The unres_queue is currently shared between all namespaces. Following patches
will additionally allow to create multiple multicast routing tables in each
namespace. Having a single shared queue for all these users seems to excessive,
move the queue and the cleanup timer to the per-namespace data to unshare it.

As a side-effect, this fixes a bug in the seq file iteration functions: the
first entry returned is always from the current namespace, entries returned
after that may belong to any namespace.

Signed-off-by: Patrick McHardy <kaber@trash.net>

include/net/netns/ipv6.h

@@ -60,6 +60,8 @@ struct netns_ipv6 {
 	struct sock             *igmp_sk;
 #ifdef CONFIG_IPV6_MROUTE
 	struct sock		*mroute6_sk;
+	struct timer_list	ipmr_expire_timer;
+	struct mfc6_cache	*mfc6_unres_queue;
 	struct mfc6_cache	**mfc6_cache_array;
 	struct mif_device	*vif6_table;
 	int			maxvif;