net: make ipv6 bind honour freebind

This makes native ipv6 bind follow the precedent set by:
  - native ipv4 bind behaviour
  - dual stack ipv4-mapped ipv6 bind behaviour.

This does allow an unpriviledged process to spoof its source IPv6
address, just like it currently can spoof its source IPv4 address
(for example when using UDP).

Signed-off-by: Maciej Żenczykowski <maze@google.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 d27c797f9f05e76b82317d1a73818e0a7557bdf3..1040424c788fe10e8bd10189902fdd1c898a2f8b 100644 (file)
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -347,7 +347,7 @@ int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
                         */
                        v4addr = LOOPBACK4_IPV6;
                        if (!(addr_type & IPV6_ADDR_MULTICAST)) {
-                               if (!inet->transparent &&
+                               if (!(inet->freebind || inet->transparent) &&
                                    !ipv6_chk_addr(net, &addr->sin6_addr,
                                                   dev, 0)) {
                                        err = -EADDRNOTAVAIL;