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linux/include/net
Maciej Żenczykowski f8dc2db873 UPSTREAM: ipv6 addrconf: implement RFC7559 router solicitation backoff
This implements:
  https://tools.ietf.org/html/rfc7559

Backoff is performed according to RFC3315 section 14:
  https://tools.ietf.org/html/rfc3315#section-14

We allow setting /proc/sys/net/ipv6/conf/*/router_solicitations
to a negative value meaning an unlimited number of retransmits,
and we make this the new default (inline with the RFC).

We also add a new setting:
  /proc/sys/net/ipv6/conf/*/router_solicitation_max_interval
defaulting to 1 hour (per RFC recommendation).

Signed-off-by: Maciej Żenczykowski <maze@google.com>
Acked-by: Erik Kline <ek@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit bd11f0741fa5a2c296629898ad07759dd12b35bb in
DaveM's net-next/master, should make Linus' tree in 4.9-rc1)
Change-Id: Ia32cdc5c61481893ef8040734e014bf2229fc39e
2017-04-10 13:29:27 +05:30
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