Date: Fri, 22 Mar 2002 09:45:45 -0500 From: "Haiwei Chan" <backend@mail.com> To: freebsd-net@freebsd.org Subject: error handling in in_ifinit() Message-ID: <20020322144545.35863.qmail@mail.com>
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In the newest 4-stable kernel whose source codes are synchronized by cvsup,
it would fail if trying to add an alias address whose network and netmask
are the same as the orignal one on that network interface:
# uname -a
FreeBSD intra.example.com 4.5-STABLE FreeBSD 4.5-STABLE #5: Fri Mar 22
13:45:41 CST 2002 root@intra.example.com:/usr/src/sys/compile/SERVER i386
# ifconfig xl0 inet 192.168.1.100 netmask 0xffffff00
# ifconfig xl0 inet 192.168.1.101 netmask 0xffffff00 alias
ifconfig: ioctl (SIOCDIFADDR): File exists
But it worked for 4.4-Release (I'd tested):
#uname -a
FreeBSD bsd.example.com 4.4-RELEASE FreeBSD 4.4-RELEASE # 17: Fri Mar 22
12:09:36 CST 2002 root@bsd.example.com:/usr/src/sys/compile/SERVER i386
# ifconfig xl0 inet 192.168.1.100 netmask 0xffffff00
# ifconfig xl0 inet 192.168.1.101 netmask 0xffffff00 alias
# ifconfig xl0
xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=3<rxcsum,txcsum>
inet 192.168.1.100 netmask 0xffffff00 broadcast 192.168.1.255
inet6 fe80::201:2ff:fe80:2a8b%xl0 prefixlen 64 scopeid 0x2
inet 192.168.1.101 netmask 0xffffff00 broadcast 255.255.255.0
ether 00:01:02:80:2a:8b
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
Below is a workground patch:
[root@www /sys/netinet]# diff -u in.c.orig in.c
--- in.c.orig Fri Mar 22 13:16:07 2002
+++ in.c Fri Mar 22 13:16:41 2002
@@ -737,7 +737,8 @@
* interface, because the bootp code wants to set a 0.0.0.0/0
* address on all interfaces. Disable the check when bootp is used.
*/
- if (error != 0 && ia->ia_dstaddr.sin_family == AF_INET) {
+ if (error != 0 && error != EEXIST &&
+ ia->ia_dstaddr.sin_family == AF_INET) {
ia->ia_addr = oldaddr;
return (error);
}
Should it be done so?
--
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