netdev - [RFC PATCH 1/4] ipv6: Disallow binding to v4-mapped address on v6-only socket.

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Date:	Tue, 17 Mar 2009 17:05:59 -0400
From:	Vlad Yasevich <vladislav.yasevich@...com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, Vlad Yasevich <vladislav.yasevich@...com>
Subject: [RFC PATCH 1/4] 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@...com>
---
 net/ipv6/af_inet6.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 3e2ddfa..07b9f3c 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;
-- 
1.5.4.3

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