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| author | Brian Haley <Brian.Haley@hp.com> | 2008-04-11 00:38:24 -0400 |
|---|---|---|
| committer | YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> | 2008-04-12 13:43:27 +0900 |
| commit | 876c7f41961dc5172b03cbf2dca65f05003f28a0 (patch) | |
| tree | 3b5644d172edf0b9d2eecfc5f6c96d41b31c9a2a /net/ipv6/udp.c | |
| parent | 6ac7eb0868ccc9a2c597d6fd0b1ea09dcdc396ed (diff) | |
| download | linux-876c7f41961dc5172b03cbf2dca65f05003f28a0.tar.bz2 | |
[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>
Diffstat (limited to 'net/ipv6/udp.c')
| -rw-r--r-- | net/ipv6/udp.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 30ef7dc5d403..1fd784f3e2ec 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -752,7 +752,10 @@ do_udp_sendmsg: opt = ipv6_fixup_options(&opt_space, opt); fl.proto = sk->sk_protocol; - 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); fl.fl_ip_sport = inet->sport; |