Balakumaran Kannan 25fb6ca4ed net IPv6 : Fix broken IPv6 routing table after loopback down-up ... IPv6 Routing table becomes broken once we do ifdown, ifup of the loopback(lo) interface. After down-up, routes of other interface's IPv6 addresses through 'lo' are lost. IPv6 addresses assigned to all interfaces are routed through 'lo' for internal communication. Once 'lo' is down, those routing entries are removed from routing table. But those removed entries are not being re-created properly when 'lo' is brought up. So IPv6 addresses of other interfaces becomes unreachable from the same machine. Also this breaks communication with other machines because of NDISC packet processing failure. This patch fixes this issue by reading all interface's IPv6 addresses and adding them to IPv6 routing table while bringing up 'lo'. ==Testing== Before applying the patch: $ route -A inet6 Kernel IPv6 routing table Destination Next Hop Flag Met Ref Use If 2000::20/128 :: U 256 0 0 eth0 fe80::/64 :: U 256 0 0 eth0 ::/0 :: !n -1 1 1 lo ::1/128 :: Un 0 1 0 lo 2000::20/128 :: Un 0 1 0 lo fe80::xxxx:xxxx:xxxx:xxxx/128 :: Un 0 1 0 lo ff00::/8 :: U 256 0 0 eth0 ::/0 :: !n -1 1 1 lo $ sudo ifdown lo $ sudo ifup lo $ route -A inet6 Kernel IPv6 routing table Destination Next Hop Flag Met Ref Use If 2000::20/128 :: U 256 0 0 eth0 fe80::/64 :: U 256 0 0 eth0 ::/0 :: !n -1 1 1 lo ::1/128 :: Un 0 1 0 lo ff00::/8 :: U 256 0 0 eth0 ::/0 :: !n -1 1 1 lo $ After applying the patch: $ route -A inet6 Kernel IPv6 routing table Destination Next Hop Flag Met Ref Use If 2000::20/128 :: U 256 0 0 eth0 fe80::/64 :: U 256 0 0 eth0 ::/0 :: !n -1 1 1 lo ::1/128 :: Un 0 1 0 lo 2000::20/128 :: Un 0 1 0 lo fe80::xxxx:xxxx:xxxx:xxxx/128 :: Un 0 1 0 lo ff00::/8 :: U 256 0 0 eth0 ::/0 :: !n -1 1 1 lo $ sudo ifdown lo $ sudo ifup lo $ route -A inet6 Kernel IPv6 routing table Destination Next Hop Flag Met Ref Use If 2000::20/128 :: U 256 0 0 eth0 fe80::/64 :: U 256 0 0 eth0 ::/0 :: !n -1 1 1 lo ::1/128 :: Un 0 1 0 lo 2000::20/128 :: Un 0 1 0 lo fe80::xxxx:xxxx:xxxx:xxxx/128 :: Un 0 1 0 lo ff00::/8 :: U 256 0 0 eth0 ::/0 :: !n -1 1 1 lo $ Signed-off-by: Balakumaran Kannan <Balakumaran.Kannan@ap.sony.com> Signed-off-by: Maruthi Thotad <Maruthi.Thotad@ap.sony.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2013-04-02 14:37:19 -04:00
..
netfilter	Merge branch 'master' of git://1984.lsi.us.es/nf	2013-03-20 10:23:52 -04:00
addrconf_core.c
addrconf.c	net IPv6 : Fix broken IPv6 routing table after loopback down-up	2013-04-02 14:37:19 -04:00
addrlabel.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
af_inet6.c
ah6.c	net: Add skb_unclone() helper function.	2013-02-15 15:10:37 -05:00
anycast.c	net: proc: change proc_net_remove to remove_proc_entry	2013-02-18 14:53:08 -05:00
datagram.c
esp6.c
exthdrs_core.c
exthdrs_offload.c
exthdrs.c
fib6_rules.c
icmp.c
inet6_connection_sock.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
inet6_hashtables.c
ip6_checksum.c
ip6_fib.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
ip6_flowlabel.c	net: proc: change proc_net_remove to remove_proc_entry	2013-02-18 14:53:08 -05:00
ip6_gre.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2013-02-08 18:02:14 -05:00
ip6_input.c	ipv6: don't accept node local multicast traffic from the wire	2013-03-29 14:57:33 -04:00
ip6_offload.c	v4 GRE: Add TCP segmentation offload for GRE	2013-02-15 15:17:11 -05:00
ip6_offload.h
ip6_output.c	ipv6: don't let node/interface scoped multicast traffic escape on the wire	2013-02-11 14:00:54 -05:00
ip6_tunnel.c
ip6mr.c	net: proc: change proc_net_remove to remove_proc_entry	2013-02-18 14:53:08 -05:00
ipcomp6.c
ipv6_sockglue.c
Kconfig	Merge branch 'akpm' (incoming from Andrew)	2013-02-21 17:38:49 -08:00
Makefile
mcast.c	net: proc: change proc_net_remove to remove_proc_entry	2013-02-18 14:53:08 -05:00
mip6.c
ndisc.c
netfilter.c
output_core.c
proc.c	net: proc: change proc_net_remove to remove_proc_entry	2013-02-18 14:53:08 -05:00
protocol.c
raw.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
reassembly.c	inet: limit length of fragment queue hash table bucket lists	2013-03-19 10:28:36 -04:00
route.c	net: ipv6: Don't purge default router if accept_ra=2	2013-03-04 14:12:07 -05:00
sit.c
syncookies.c
sysctl_net_ipv6.c
tcp_ipv6.c	tcp: dont handle MTU reduction on LISTEN socket	2013-03-18 13:31:28 -04:00
tcpv6_offload.c
tunnel6.c
udp_impl.h
udp_offload.c	v4 GRE: Add TCP segmentation offload for GRE	2013-02-15 15:17:11 -05:00
udp.c	udp: add encap_destroy callback	2013-03-20 12:10:38 -04:00
udplite.c
xfrm6_input.c
xfrm6_mode_beet.c
xfrm6_mode_ro.c
xfrm6_mode_transport.c
xfrm6_mode_tunnel.c	ipv6: fix warning in xfrm6_mode_tunnel_input	2013-02-18 12:42:47 -05:00
xfrm6_output.c
xfrm6_policy.c	xfrm: release neighbor upon dst destruction	2013-02-18 14:57:29 -05:00
xfrm6_state.c
xfrm6_tunnel.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00