From: Vlad Yasevich <vladislav.yasevich@hp.com>
Date: Tue, 24 Mar 2009 16:24:48 +0000 (+0000)
Subject: ipv6: Disallow binding to v4-mapped address on v6-only socket.
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=783ed5a78373253052bc61a3c5c8b9f17af4e3c6;p=openwrt%2Fstaging%2Fblogic.git

ipv6: Disallow binding to v4-mapped address on v6-only socket.

A socket marked v6-only, can not receive or send traffic to v4-mapped
addresses.  Thus allowing binding to v4-mapped address on such a
socket makes no sense.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index fbf533cc9dce..7f092fa912bd 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -276,6 +276,13 @@ int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 
 	/* Check if the address belongs to the host. */
 	if (addr_type == IPV6_ADDR_MAPPED) {
+		/* Binding to v4-mapped address on a v6-only socket
+		 * makes no sense
+		 */
+		if (np->ipv6only) {
+			err = -EINVAL;
+			goto out;
+		}
 		v4addr = addr->sin6_addr.s6_addr32[3];
 		if (inet_addr_type(net, v4addr) != RTN_LOCAL) {
 			err = -EADDRNOTAVAIL;