ipv6: Fix commit 63d9950b08184e6531adceb65f64b429909cc101 (ipv6: Make v4-mapped bindi...

Commit 63d9950b08184e6531adceb65f64b429909cc101
  (ipv6: Make v4-mapped bindings consistent with IPv4)
changes behavior of inet6_bind() for v4-mapped addresses so it should
behave the same way as inet_bind().

During this change setting of err to -EADDRNOTAVAIL got lost:

af_inet.c:469 inet_bind()
	err = -EADDRNOTAVAIL;
	if (!sysctl_ip_nonlocal_bind &&
	    !(inet->freebind || inet->transparent) &&
	    addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
	    chk_addr_ret != RTN_LOCAL &&
	    chk_addr_ret != RTN_MULTICAST &&
	    chk_addr_ret != RTN_BROADCAST)
		goto out;

af_inet6.c:463 inet6_bind()
	if (addr_type == IPV6_ADDR_MAPPED) {
		int chk_addr_ret;

		/* Binding to v4-mapped address on a v6-only socket
		 * makes no sense
		 */
		if (np->ipv6only) {
			err = -EINVAL;
			goto out;
		}

		/* Reproduce AF_INET checks to make the bindings consitant */
		v4addr = addr->sin6_addr.s6_addr32[3];
		chk_addr_ret = inet_addr_type(net, v4addr);
		if (!sysctl_ip_nonlocal_bind &&
		    !(inet->freebind || inet->transparent) &&
		    v4addr != htonl(INADDR_ANY) &&
		    chk_addr_ret != RTN_LOCAL &&
		    chk_addr_ret != RTN_MULTICAST &&
		    chk_addr_ret != RTN_BROADCAST)
			goto out;
	} else {

Signed-off-by Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index caa0278d30a9dbedb6ca0dc172144c7992e2e485..45f9a2a42d564391134797ac5df3e72c59a60621 100644 (file)
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -306,8 +306,10 @@ int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
                    v4addr != htonl(INADDR_ANY) &&
                    chk_addr_ret != RTN_LOCAL &&
                    chk_addr_ret != RTN_MULTICAST &&
-                   chk_addr_ret != RTN_BROADCAST)
+                   chk_addr_ret != RTN_BROADCAST) {
+                       err = -EADDRNOTAVAIL;
                        goto out;
+               }
        } else {
                if (addr_type != IPV6_ADDR_ANY) {
                        struct net_device *dev = NULL;