| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.7 005/244] ipv6: Fix use of anycast address with loopback | Date | Mon, 20 Jul 2020 17:34:36 +0200 |
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From: David Ahern <dsahern@kernel.org>
[ 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: c7a1ce397ada ("ipv6: Change addrconf_f6i_alloc to use ip6_route_info_create") Reported-by: thomas.gambier@nexedi.com Signed-off-by: David Ahern <dsahern@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/ipv6/route.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -3402,7 +3402,7 @@ static bool fib6_is_reject(u32 flags, st 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;
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