From 783ed5a78373253052bc61a3c5c8b9f17af4e3c6 Mon Sep 17 00:00:00 2001 From: Vlad Yasevich Date: Tue, 24 Mar 2009 16:24:48 +0000 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- net/ipv6/af_inet6.c | 7 +++++++ 1 file changed, 7 insertions(+) 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; -- 2.20.1