[IPv6]: Change IPv6 unspecified destination address to ::1 for raw and un-connected sockets
This patch fixes a difference between IPv4 and IPv6 when sending packets
to the unspecified address (either 0.0.0.0 or ::) when using raw or
un-connected UDP sockets. There are two cases where IPv6 either fails
to send anything, or sends with the destination address set to ::. For
example:
--> ping -c1 0.0.0.0
PING 0.0.0.0 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.032 ms
--> ping6 -c1 ::
PING ::(::) 56 data bytes
ping: sendmsg: Invalid argument
Doing a sendto("0.0.0.0") reveals:
10:55:01.495090 IP localhost.32780 > localhost.7639: UDP, length 100
Doing a sendto("::") reveals:
10:56:13.262478 IP6 fe80::217:8ff:fe7d:4718.32779 > ::.7639: UDP, length 100
If you issue a connect() first in the UDP case, it will be sent to ::1,
similar to what happens with TCP.
This restores the BSD-ism.
Signed-off-by: Brian Haley <brian.haley@hp.com>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 088b80b..059298b 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -805,15 +805,6 @@
fl.fl6_flowlabel = np->flow_label;
}
- if (ipv6_addr_any(daddr)) {
- /*
- * unspecified destination address
- * treated as error... is this correct ?
- */
- fl6_sock_release(flowlabel);
- return(-EINVAL);
- }
-
if (fl.oif == 0)
fl.oif = sk->sk_bound_dev_if;
@@ -846,7 +837,10 @@
if (err)
goto out;
- ipv6_addr_copy(&fl.fl6_dst, daddr);
+ if (!ipv6_addr_any(daddr))
+ ipv6_addr_copy(&fl.fl6_dst, daddr);
+ else
+ fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
ipv6_addr_copy(&fl.fl6_src, &np->saddr);