ipv6: Handle IPv4-mapped src to in6addr_any dst.

This patch adds a check on the type of the source address for the case
where the destination address is in6addr_any. If the source is an
IPv4-mapped IPv6 source address, the destination is changed to
::ffff:127.0.0.1, and otherwise the destination is changed to ::1. This
is done in three locations to handle UDP calls to either connect() or
sendmsg() and TCP calls to connect(). Note that udpv6_sendmsg() delays
handling an in6addr_any destination until very late, so the patch only
needs to handle the case where the source is an IPv4-mapped IPv6
address.

Signed-off-by: Jonathan T. Leighton <jtleight@udel.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index a3eaafd8710091c0484a5c608862d13808d612b3..eec27f87efaca15133cf1d5225e37e6a2f6a6f8a 100644 (file)
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -167,18 +167,22 @@ int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr,
        if (np->sndflow)
                fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 
-       addr_type = ipv6_addr_type(&usin->sin6_addr);
-
-       if (addr_type == IPV6_ADDR_ANY) {
+       if (ipv6_addr_any(&usin->sin6_addr)) {
                /*
                 *      connect to self
                 */
-               usin->sin6_addr.s6_addr[15] = 0x01;
+               if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
+                       ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
+                                              &usin->sin6_addr);
+               else
+                       usin->sin6_addr = in6addr_loopback;
        }
 
+       addr_type = ipv6_addr_type(&usin->sin6_addr);
+
        daddr = &usin->sin6_addr;
 
-       if (addr_type == IPV6_ADDR_MAPPED) {
+       if (addr_type & IPV6_ADDR_MAPPED) {
                struct sockaddr_in sin;
 
                if (__ipv6_only_sock(sk)) {

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index eaad72c3d7462b4af09d632fe88466148964e679..4c60c6f71cd30bf18f270c3d994f193ad13045ae 100644 (file)
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -148,8 +148,13 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
         *      connect() to INADDR_ANY means loopback (BSD'ism).
         */
 
-       if (ipv6_addr_any(&usin->sin6_addr))
-               usin->sin6_addr.s6_addr[15] = 0x1;
+       if (ipv6_addr_any(&usin->sin6_addr)) {
+               if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
+                       ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
+                                              &usin->sin6_addr);
+               else
+                       usin->sin6_addr = in6addr_loopback;
+       }
 
        addr_type = ipv6_addr_type(&usin->sin6_addr);
 
@@ -188,7 +193,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
         *      TCP over IPv4
         */
 
-       if (addr_type == IPV6_ADDR_MAPPED) {
+       if (addr_type & IPV6_ADDR_MAPPED) {
                u32 exthdrlen = icsk->icsk_ext_hdr_len;
                struct sockaddr_in sin;
 

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 8990856f5101eaabaf14d4017df522f37845083b..221825a9407afebba47106f60729f91e2992158c 100644 (file)
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1033,6 +1033,10 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
                        if (addr_len < SIN6_LEN_RFC2133)
                                return -EINVAL;
                        daddr = &sin6->sin6_addr;
+                       if (ipv6_addr_any(daddr) &&
+                           ipv6_addr_v4mapped(&np->saddr))
+                               ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
+                                                      daddr);
                        break;
                case AF_INET:
                        goto do_udp_sendmsg;