diff options
| author | Erik Kline <ek@google.com> | 2014-10-28 18:11:14 +0900 |
|---|---|---|
| committer | Daniel Rosenberg <drosen@google.com> | 2015-01-12 16:49:34 -0800 |
| commit | 89fbdae3db79797dc82e07c8135c591e4089fba5 (patch) | |
| tree | cf09b9152b560f39948df88f6302094b9ffda32b /Documentation | |
| parent | 874cdadb06c54fdb9e24c7dbbed0ea7e5aecb747 (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.
[cherry-pick of net-next 7fd2561e4ebdd070ebba6d3326c4c5b13942323f]
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>
Bug: 17769720
Change-Id: Ic7e50781c607e1f3a492d9ce7395946efb95c533
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/networking/ip-sysctl.txt | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt index 6a6267a4be58..982587b92373 100644 --- a/Documentation/networking/ip-sysctl.txt +++ b/Documentation/networking/ip-sysctl.txt @@ -1448,6 +1448,19 @@ suppress_frag_ndisc - INTEGER 1 - (default) discard fragmented neighbor discovery packets 0 - allow fragmented neighbor discovery packets +optimistic_dad - BOOLEAN + Whether to perform Optimistic Duplicate Address Detection (RFC 4429). + 0: disabled (default) + 1: enabled + +use_optimistic - BOOLEAN + If enabled, do not classify optimistic addresses as deprecated during + source address selection. Preferred addresses will still be chosen + before optimistic addresses, subject to other ranking in the source + address selection algorithm. + 0: disabled (default) + 1: enabled + icmp/*: ratelimit - INTEGER Limit the maximal rates for sending ICMPv6 packets. |