diff options
| author | Erik Kline <ek@google.com> | 2014-10-28 18:11:14 +0900 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-10-29 15:11:36 -0400 |
| commit | 7fd2561e4ebdd070ebba6d3326c4c5b13942323f (patch) | |
| tree | 0705e64d0da12c0194a17f64445f30336159d7b7 /include | |
| parent | 8b243a61940d2ca3c3a370e551b88d47a09ede0c (diff) | |
net: ipv6: Add a sysctl to make optimistic addresses useful candidates
Add a sysctl that causes an interface's optimistic addresses
to be considered equivalent to other non-deprecated addresses
for source address selection purposes. Preferred addresses
will still take precedence over optimistic addresses, subject
to other ranking in the source address selection algorithm.
This is useful where different interfaces are connected to
different networks from different ISPs (e.g., a cell network
and a home wifi network).
The current behaviour complies with RFC 3484/6724, and it
makes sense if the host has only one interface, or has
multiple interfaces on the same network (same or cooperating
administrative domain(s), but not in the multiple distinct
networks case.
For example, if a mobile device has an IPv6 address on an LTE
network and then connects to IPv6-enabled wifi, while the wifi
IPv6 address is undergoing DAD, IPv6 connections will try use
the wifi default route with the LTE IPv6 address, and will get
stuck until they time out.
Also, because optimistic nodes can receive frames, issue
an RTM_NEWADDR as soon as DAD starts (with the IFA_F_OPTIMSTIC
flag appropriately set). A second RTM_NEWADDR is sent if DAD
completes (the address flags have changed), otherwise an
RTM_DELADDR is sent.
Also: add an entry in ip-sysctl.txt for optimistic_dad.
Signed-off-by: Erik Kline <ek@google.com>
Acked-by: Lorenzo Colitti <lorenzo@google.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/ipv6.h | 1 | ||||
| -rw-r--r-- | include/uapi/linux/ipv6.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h index ff560537dd6..7121a2e97ce 100644 --- a/include/linux/ipv6.h +++ b/include/linux/ipv6.h @@ -42,6 +42,7 @@ struct ipv6_devconf { __s32 accept_ra_from_local; #ifdef CONFIG_IPV6_OPTIMISTIC_DAD __s32 optimistic_dad; + __s32 use_optimistic; #endif #ifdef CONFIG_IPV6_MROUTE __s32 mc_forwarding; diff --git a/include/uapi/linux/ipv6.h b/include/uapi/linux/ipv6.h index efa2666f4b8..e863d088b9a 100644 --- a/include/uapi/linux/ipv6.h +++ b/include/uapi/linux/ipv6.h @@ -164,6 +164,7 @@ enum { DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL, DEVCONF_SUPPRESS_FRAG_NDISC, DEVCONF_ACCEPT_RA_FROM_LOCAL, + DEVCONF_USE_OPTIMISTIC, DEVCONF_MAX }; |