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authorBrian Haley <Brian.Haley@hp.com>2008-04-11 00:38:24 -0400
committerYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>2008-04-12 13:43:27 +0900
commit876c7f41961dc5172b03cbf2dca65f05003f28a0 (patch)
tree3b5644d172edf0b9d2eecfc5f6c96d41b31c9a2a /net/ipv6/udp.c
parent6ac7eb0868ccc9a2c597d6fd0b1ea09dcdc396ed (diff)
downloadlinux-2.6.38-lt-ux500-876c7f41961dc5172b03cbf2dca65f05003f28a0.tar.gz
[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.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 30ef7dc5d40..1fd784f3e2e 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;