tree bfad5bc2bff6bc70d8455db794c7b779cc81e9f1
parent 7b900ead6cc66b2ee873cb042dfba169aa68b56c
author Jeff Barnhill <0xeffeff@gmail.com> 1541190237 +0000
committer David S. Miller <davem@davemloft.net> 1541228096 -0700

net/ipv6: Add anycast addresses to a global hashtable

icmp6_send() function is expensive on systems with a large number of
interfaces. Every time it’s called, it has to verify that the source
address does not correspond to an existing anycast address by looping
through every device and every anycast address on the device.  This can
result in significant delays for a CPU when there are a large number of
neighbors and ND timers are frequently timing out and calling
neigh_invalidate().

Add anycast addresses to a global hashtable to allow quick searching for
matching anycast addresses.  This is based on inet6_addr_lst in addrconf.c.

Signed-off-by: Jeff Barnhill <0xeffeff@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>