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f1705ec197
linux/net
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David Ahern f1705ec197 net: ipv6: Make address flushing on ifdown optional 
Currently, all ipv6 addresses are flushed when the interface is configured
down, including global, static addresses:

    $ ip -6 addr show dev eth1
    3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
        inet6 2100:1::2/120 scope global
           valid_lft forever preferred_lft forever
        inet6 fe80::e0:f9ff:fe79:34bd/64 scope link
           valid_lft forever preferred_lft forever
    $ ip link set dev eth1 down
    $ ip -6 addr show dev eth1
    << nothing; all addresses have been flushed>>

Add a new sysctl to make this behavior optional. The new setting defaults to
flush all addresses to maintain backwards compatibility. When the set global
addresses with no expire times are not flushed on an admin down. The sysctl
is per-interface or system-wide for all interfaces

    $ sysctl -w net.ipv6.conf.eth1.keep_addr_on_down=1
or
    $ sysctl -w net.ipv6.conf.all.keep_addr_on_down=1

Will keep addresses on eth1 on an admin down.

    $ ip -6 addr show dev eth1
    3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
        inet6 2100:1::2/120 scope global
           valid_lft forever preferred_lft forever
        inet6 fe80::e0:f9ff:fe79:34bd/64 scope link
           valid_lft forever preferred_lft forever
    $ ip link set dev eth1 down
    $ ip -6 addr show dev eth1
    3: eth1: <BROADCAST,MULTICAST> mtu 1500 state DOWN qlen 1000
        inet6 2100:1::2/120 scope global tentative
           valid_lft forever preferred_lft forever
        inet6 fe80::e0:f9ff:fe79:34bd/64 scope link tentative
           valid_lft forever preferred_lft forever

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-02-25 21:45:15 -05:00
..
6lowpan 6lowpan: fix debugfs interface entry name 2015-12-20 08:21:00 +01:00
9p Rework and error handling fixes, primarily in the fscatch and fd transports. 2016-01-24 12:39:09 -08:00
802
8021q vlan: turn on unicast filtering on vlan device 2016-02-21 21:54:05 -05:00
appletalk appletalk: fix erroneous return value 2016-02-18 14:59:34 -05:00
atm net: Generalise wq_has_sleeper helper 2015-11-30 14:47:33 -05:00
ax25 net: add validation for the socket syscall protocol argument 2015-12-14 16:09:30 -05:00
batman-adv batman-adv: Rename batadv_tt_orig_list_entry *_free_ref function to *_put 2016-02-23 13:51:01 +08:00
bluetooth Bluetooth: hci_core: Avoid mixing up req_complete and req_complete_skb 2016-02-20 08:52:28 +01:00
bridge Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-02-23 00:09:14 -05:00
caif net: caif: fix erroneous return value 2016-02-18 14:59:35 -05:00
can can: avoid using timeval for uapi 2015-10-13 17:42:34 +02:00
ceph libceph: MOSDOpReply v7 encoding 2016-02-04 18:26:08 +01:00
core flow_dissector: Use same pointer for IPv4 and IPv6 addresses 2016-02-24 13:58:05 -05:00
dcb net/dcb: make dcbnl.c explicitly non-modular 2015-10-09 07:52:27 -07:00
dccp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-02-23 00:09:14 -05:00
decnet net: add validation for the socket syscall protocol argument 2015-12-14 16:09:30 -05:00
dns_resolver net: dns_resolver: convert time_t to time64_t 2015-11-18 16:27:46 -05:00
dsa net: dsa: drop vlan_getnext 2016-02-25 15:20:21 -05:00
ethernet eth: Pull header from first fragment via eth_get_headlen 2016-02-24 13:58:05 -05:00
hsr net/hsr: fix a warning message 2015-11-23 14:56:15 -05:00
ieee802154 sock: struct proto hash function may error 2016-02-11 03:54:14 -05:00
ipv4 soreuseport: fix merge conflict in tcp bind 2016-02-24 13:38:18 -05:00
ipv6 net: ipv6: Make address flushing on ifdown optional 2016-02-25 21:45:15 -05:00
ipx
irda irda: fix a potential use-after-free in ircomm_param_request 2016-01-29 22:56:46 -08:00
iucv af_iucv: Validate socket address length in iucv_sock_bind() 2016-01-19 14:21:08 -05:00
key af_key: fix two typos 2015-10-23 03:05:19 -07:00
l2tp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-02-23 00:09:14 -05:00
l3mdev net: Add netif_is_l3_slave 2015-10-07 04:27:43 -07:00
lapb
llc af_llc: fix types on llc_ui_wait_for_conn 2016-02-17 16:12:13 -05:00
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-02-01 15:56:08 -08:00
mac802154 mac802154: constify ieee802154_llsec_ops structure 2016-01-04 20:40:41 +01:00
mpls mpls: autoload lwt module 2016-02-21 22:00:28 -05:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-02-23 00:09:14 -05:00
netlabel
netlink nfnetlink: Revert "nfnetlink: add support for memory mapped netlink" 2016-02-18 11:42:22 -05:00
netrom
nfc NFC 4.5 pull request 2016-01-04 21:48:15 -05:00
openvswitch Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-02-23 00:09:14 -05:00
packet packet: tpacket_snd gso and checksum offload 2016-02-09 06:43:50 -05:00
phonet sock: struct proto hash function may error 2016-02-11 03:54:14 -05:00
rds rds: duplicate include net/tcp.h 2016-02-11 09:45:24 -05:00
rfkill rfkill: fix rfkill_fop_read wait_event usage 2016-01-26 11:32:05 +01:00
rose
rxrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-01-12 18:57:02 -08:00
sched net_sched: add network namespace support for tc actions 2016-02-25 14:16:21 -05:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-02-23 00:09:14 -05:00
sunrpc Initial roundup of 4.5 merge window patches 2016-01-23 18:45:06 -08:00
switchdev switchdev: Require RTNL mutex to be held when sending FDB notifications 2016-01-28 16:21:31 -08:00
tipc tipc: fix null deref crash in compat config path 2016-02-25 17:04:48 -05:00
unix Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-02-23 00:09:14 -05:00
vmw_vsock vsock: Fix blocking ops call in prepare_to_wait 2016-02-13 05:57:39 -05:00
wimax
wireless regulatory: fix world regulatory domain data 2016-01-14 11:10:13 +01:00
x25
xfrm net: preserve IP control block during GSO segmentation 2016-01-15 14:35:24 -05:00
compat.c
Kconfig net: add dst_cache support 2016-02-16 20:21:48 -05:00
Makefile net: Introduce L3 Master device abstraction 2015-09-29 20:40:32 -07:00
socket.c kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
sysctl_net.c net: sysctl: fix a kmemleak warning 2015-10-23 06:22:08 -07:00