Commit ec5e3b0a authored Feb 12, 2017 by Jonathan T. Leighton Committed by David S. Miller Feb 14, 2017

ipv6: Inhibit IPv4-mapped src address on the wire.

This patch adds a check for the problematic case of an IPv4-mapped IPv6
source address and a destination address that is neither an IPv4-mapped
IPv6 address nor in6addr_any, and returns an appropriate error. The
check in done before returning from looking up the route.

Signed-off-by: Jonathan T. Leighton <jtleight@udel.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent fed06ee8

net/ipv6/ip6_output.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1021,6 +1021,9 @@ static int ip6_dst_lookup_tail(struct net net, const struct sock sk,
		}
		}
		#endif
		if (ipv6_addr_v4mapped(&fl6->saddr) &&
		!(ipv6_addr_v4mapped(&fl6->daddr) \|\| ipv6_addr_any(&fl6->daddr)))
		return -EAFNOSUPPORT;

		return 0;