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Nicolas Dichtel f2272d5dce ipv6: set all.accept_dad to 0 by default 
[ Upstream commit 0940095316 ]

With commits 35e015e1f5 and a2d3f3e338, the global 'accept_dad' flag
is also taken into account (default value is 1). If either global or
per-interface flag is non-zero, DAD will be enabled on a given interface.

This is not backward compatible: before those patches, the user could
disable DAD just by setting the per-interface flag to 0. Now, the
user instead needs to set both flags to 0 to actually disable DAD.

Restore the previous behaviour by setting the default for the global
'accept_dad' flag to 0. This way, DAD is still enabled by default,
as per-interface flags are set to 1 on device creation, but setting
them to 0 is enough to disable DAD on a given interface.

- Before 35e015e1f57a7 and a2d3f3e33853:
          global    per-interface    DAD enabled
[default]   1             1              yes
            X             0              no
            X             1              yes

- After 35e015e1f5 and a2d3f3e33853:
          global    per-interface    DAD enabled
[default]   1             1              yes
            0             0              no
            0             1              yes
            1             0              yes

- After this fix:
          global    per-interface    DAD enabled
            1             1              yes
            0             0              no
[default]   0             1              yes
            1             0              yes

Fixes: 35e015e1f5 ("ipv6: fix net.ipv6.conf.all interface DAD handlers")
Fixes: a2d3f3e338 ("ipv6: fix net.ipv6.conf.all.accept_dad behaviour for real")
CC: Stefano Brivio <sbrivio@redhat.com>
CC: Matteo Croce <mcroce@redhat.com>
CC: Erik Kline <ek@google.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2018-01-02 20:31:13 +01:00
..
ila License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
netfilter License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig ipv6: sr: add helper functions for seg6local 2017-08-25 17:10:24 -07:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
addrconf.c ipv6: set all.accept_dad to 0 by default 2018-01-02 20:31:13 +01:00
addrconf_core.c Ipvlan should return an error when an address is already in use. 2017-06-09 12:26:07 -04:00
addrlabel.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
af_inet6.c net: reevalulate autoflowlabel setting after sysctl setting 2018-01-02 20:31:06 +01:00
ah6.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2017-06-23 14:17:31 -04:00
anycast.c net, ipv6: convert ifacaddr6.aca_refcnt from atomic_t to refcount_t 2017-07-04 01:29:04 -07:00
calipso.c net, calipso: convert calipso_doi.refcount from atomic_t to refcount_t 2017-07-04 22:35:16 +01:00
datagram.c net: convert sock.sk_refcnt from atomic_t to refcount_t 2017-07-01 07:39:08 -07:00
esp6.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-09-01 17:42:05 -07:00
esp6_offload.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-09-01 17:42:05 -07:00
exthdrs.c ipv6: sr: allow SRH insertion with arbitrary segments_left value 2017-08-07 14:16:21 -07:00
exthdrs_core.c ipv6: constify the skb pointer of ipv6_find_tlv(). 2016-06-27 15:06:15 -04:00
exthdrs_offload.c ipv6: fix exthdrs offload registration in out_rt path 2015-09-02 15:31:00 -07:00
fib6_notifier.c net: Add module reference to FIB notifiers 2017-09-01 20:33:42 -07:00
fib6_rules.c net: ipv6: avoid overhead when no custom FIB rules are installed 2017-08-08 21:40:08 -07:00
fou6.c fou: make local function static 2017-05-21 13:42:36 -04:00
icmp.c ipv6: Use rt6i_idev index for echo replies to a local address 2017-08-29 15:32:25 -07:00
inet6_connection_sock.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-01-28 10:33:06 -05:00
inet6_hashtables.c net: ipv6: add second dif to inet6 socket lookups 2017-08-07 11:39:22 -07:00
ip6_checksum.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ip6_fib.c ipv6: fix typo in fib6_net_exit() 2017-09-08 16:09:04 -07:00
ip6_flowlabel.c ipv6: flowlabel: do not leave opt->tot_len with garbage 2017-10-22 03:22:24 +01:00
ip6_gre.c ip6_gre: fix device features for ioctl setup 2018-01-02 20:31:09 +01:00
ip6_icmp.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ip6_input.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-04-20 10:35:33 -04:00
ip6_offload.c gso: fix payload length when gso_size is zero 2017-10-08 10:12:15 -07:00
ip6_offload.h udp: Add GRO functions to UDP socket 2016-04-07 16:53:29 -04:00
ip6_output.c net: reevalulate autoflowlabel setting after sysctl setting 2018-01-02 20:31:06 +01:00
ip6_tunnel.c adding missing rcu_read_unlock in ipxip6_rcv 2018-01-02 20:31:08 +01:00
ip6_udp_tunnel.c ip6_udp_tunnel: remove unused IPCB related codes 2016-11-02 15:18:36 -04:00
ip6_vti.c vti: fix use after free in vti_tunnel_xmit/vti6_tnl_xmit 2017-09-26 09:58:21 -07:00
ip6mr.c rtnetlink: make rtnl_register accept a flags parameter 2017-08-09 16:57:38 -07:00
ipcomp6.c net: inet: Support UID-based routing in IP protocols. 2016-11-04 14:45:23 -04:00
ipv6_sockglue.c net: reevalulate autoflowlabel setting after sysctl setting 2018-01-02 20:31:06 +01:00
mcast.c ipv6: mcast: better catch silly mtu values 2018-01-02 20:31:06 +01:00
mcast_snoop.c net: fix wrong skb_get() usage / crash in IGMP/MLD parsing code 2015-08-13 17:08:39 -07:00
mip6.c ktime: Get rid of ktime_equal() 2016-12-25 17:21:23 +01:00
ndisc.c neigh: increase queue_len_bytes to match wmem_default 2017-08-29 16:10:50 -07:00
netfilter.c net: inet: Support UID-based routing in IP protocols. 2016-11-04 14:45:23 -04:00
output_core.c net: accept UFO datagrams from tuntap and packet 2017-12-17 15:07:58 +01:00
ping.c net: ping: do not abuse udp_poll() 2017-06-04 22:56:55 -04:00
proc.c proc: snmp6: Use correct type in memset 2017-06-12 09:53:14 -04:00
protocol.c net: Add sysctl to toggle early demux for tcp and udp 2017-03-24 13:17:07 -07:00
raw.c net: ipv6: add second dif to raw socket lookups 2017-08-07 11:39:22 -07:00
reassembly.c Revert "net: fix percpu memory leaks" 2017-09-03 11:01:05 -07:00
route.c ipv6: Honor specified parameters in fibmatch lookup 2018-01-02 20:31:11 +01:00
seg6.c ipv6: sr: define core operations for seg6local lightweight tunnel 2017-08-07 14:16:22 -07:00
seg6_hmac.c ipv6: sr: Use ARRAY_SIZE macro 2017-09-01 18:35:23 -07:00
seg6_iptunnel.c ipv6: sr: add support for encapsulation of L2 frames 2017-08-25 17:10:23 -07:00
seg6_local.c ipv6: sr: remove duplicate routing header type check 2017-09-11 14:34:10 -07:00
sit.c sit: update frag_off info 2017-12-17 15:07:56 +01:00
syncookies.c ipv4: ipv6: initialize treq->txhash in cookie_v[46]_check() 2017-07-18 11:22:51 -07:00
sysctl_net_ipv6.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tcp_ipv6.c tcp md5sig: Use skb's saddr when replying to an incoming segment 2018-01-02 20:31:07 +01:00
tcpv6_offload.c
…
tunnel6.c ipv6: fix tunnel error handling 2015-11-03 10:52:13 -05:00
udp.c udpv6: Fix the checksum computation when HW checksum does not apply 2017-09-18 11:43:03 -07:00
udp_impl.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
udp_offload.c net: accept UFO datagrams from tuntap and packet 2017-12-17 15:07:58 +01:00
udplite.c udplite: call proper backlog handlers 2016-11-24 15:32:14 -05:00
xfrm6_input.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xfrm6_mode_beet.c networking: make skb_pull & friends return void pointers 2017-06-16 11:48:39 -04:00
xfrm6_mode_ro.c ipv6: xfrm: Handle errors reported by xfrm6_find_1stfragopt() 2017-06-02 13:57:27 -04:00
xfrm6_mode_transport.c ipv6: xfrm: Handle errors reported by xfrm6_find_1stfragopt() 2017-06-02 13:57:27 -04:00
xfrm6_mode_tunnel.c xfrm: Add encapsulation header offsets while SKB is not encrypted 2017-04-14 10:07:39 +02:00
xfrm6_output.c xfrm: Add an IPsec hardware offloading API 2017-04-14 10:06:10 +02:00
xfrm6_policy.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xfrm6_protocol.c xfrm: input: constify xfrm_input_afinfo 2017-02-09 10:22:17 +01:00
xfrm6_state.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xfrm6_tunnel.c net, ipv6: convert xfrm6_tunnel_spi.refcnt from atomic_t to refcount_t 2017-07-04 01:29:04 -07:00