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Commit f8646548 authored by David Ahern's avatar David Ahern Committed by Greg Kroah-Hartman
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ipv6: Fix use of anycast address with loopback 



[ Upstream commit aea23c323d89836bcdcee67e49def997ffca043b ]

Thomas reported a regression with IPv6 and anycast using the following
reproducer:

    echo 1 >  /proc/sys/net/ipv6/conf/all/forwarding
    ip -6 a add fc12::1/16 dev lo
    sleep 2
    echo "pinging lo"
    ping6 -c 2 fc12::

The conversion of addrconf_f6i_alloc to use ip6_route_info_create missed
the use of fib6_is_reject which checks addresses added to the loopback
interface and sets the REJECT flag as needed. Update fib6_is_reject for
loopback checks to handle RTF_ANYCAST addresses.

Fixes: c7a1ce39 ("ipv6: Change addrconf_f6i_alloc to use ip6_route_info_create")
Reported-by: default avatar <thomas.gambier@nexedi.com>
Signed-off-by: default avatarDavid Ahern <dsahern@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 75270f81

net/ipv6/route.c

+1 −1
Original line number Diff line number Diff line
@@ -3409,7 +3409,7 @@ static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type) 
	if ((flags & RTF_REJECT) ||

	    (dev && (dev->flags & IFF_LOOPBACK) &&

	     !(addr_type & IPV6_ADDR_LOOPBACK) &&

	     !(flags & RTF_LOCAL)))

	     !(flags & (RTF_ANYCAST | RTF_LOCAL))))

		return true;



	return false;