ipv6: Make v4-mapped bindings consistent with IPv4
Binding to a v4-mapped address on an AF_INET6 socket should
produce the same result as binding to an IPv4 address on
AF_INET socket. The two are interchangable as v4-mapped
address is really a portability aid.
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 9b6a37d..61f5538 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -276,6 +276,8 @@
/* Check if the address belongs to the host. */
if (addr_type == IPV6_ADDR_MAPPED) {
+ int chk_addr_ret;
+
/* Binding to v4-mapped address on a v6-only socket
* makes no sense
*/
@@ -283,11 +285,17 @@
err = -EINVAL;
goto out;
}
+
+ /* Reproduce AF_INET checks to make the bindings consitant */
v4addr = addr->sin6_addr.s6_addr32[3];
- if (inet_addr_type(net, v4addr) != RTN_LOCAL) {
- err = -EADDRNOTAVAIL;
+ 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 {
if (addr_type != IPV6_ADDR_ANY) {
struct net_device *dev = NULL;