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ipv6: check for IPv4 mapped addresses when connecting IPv6 sockets

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When support for binding to 'mapped INADDR_ANY (::ffff.0.0.0.0)' was added
in 0f8d3c7ac3 the rest of the code
wasn't told so now it's possible to bind IPv6 datagram socket to
::ffff.0.0.0.0, connect it to another IPv4 address and it will all
work except for getsockhame() which does not return the local address
as expected.

To give getsockname() something to work with check for 'mapped INADDR_ANY'
when connecting and update the in-core source addresses appropriately.

Signed-off-by: Max Matveev <makc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Max Matveev 2011-08-05 03:56:30 -07:00 committed by David S. Miller
parent 20e72a4409
commit c15fea2d8c
1 changed files with 9 additions and 2 deletions
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11
net/ipv6/datagram.c
View File

@ -33,6 +33,11 @@
#include <linux/errqueue.h>
#include <asm/uaccess.h>
static inline int ipv6_mapped_addr_any(const struct in6_addr *a)
{
return (ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0));
}
int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
@ -102,10 +107,12 @@ ipv4_connected:
ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr);
if (ipv6_addr_any(&np->saddr))
if (ipv6_addr_any(&np->saddr) ||
ipv6_mapped_addr_any(&np->saddr))
ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
if (ipv6_addr_any(&np->rcv_saddr)) {
if (ipv6_addr_any(&np->rcv_saddr) ||
ipv6_mapped_addr_any(&np->rcv_saddr)) {
ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
&np->rcv_saddr);
if (sk->sk_prot->rehash)