Preparation for Linux 3.0

From: Tetsuo Handa
Date: Wed Jun 01 2011 - 23:50:52 EST

I noticed that commit 55922c9d "Linux 3.0-rc1" caused
dhcp-client 2.0pl5-19.1sarge3 (in Debian Sarge) to report SIOCSIFNETMASK and
SIOCSIFBRDADDR errors (though, it seems to me that these errors are not
affecting the functionality).

Setting up IP spoofing protection: rp_filter.
Configuring network interfaces...Internet Software Consortium DHCP Client 2.0pl5
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All rights reserved.

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[ 21.081635] pcnet32 0000:02:00.0: eth0: link up
SIOCSIFNETMASK: Cannot assign requested address
SIOCSIFBRDADDR: Cannot assign requested address
Listening on LPF/eth0/00:0c:29:9e:eb:32
Sending on LPF/eth0/00:0c:29:9e:eb:32
Sending on Socket/fallback/fallback-net
DHCPDISCOVER on eth0 to port 67 interval 3
DHCPREQUEST on eth0 to port 67
bound to -- renewal in 43200 seconds.
Starting portmap daemon: portmap.

I guess this program is doing something like below.

if grep -q ^2.6 /proc/sys/kernel/osrelease
do ioctl for 2.6 kernels
do ioctl for 2.4 kernels

We need to widely announce that userland applications using branches based on
/proc/sys/kernel/osrelease need to be fixed.

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