netdev - [PATCH 2/2] RFCv2: ipv4: share sysctl net/ipv4/conf/DEVNAME/ tables

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Date:	Fri, 28 Jan 2011 08:12:12 +0200
From:	Lucian Adrian Grijincu <lucian.grijincu@...il.com>
To:	netdev@...r.kernel.org
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	Nick Piggin <npiggin@...nel.dk>,
	Al Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@....de>,
	Dave Chinner <dchinner@...hat.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Thomas Graf <tgraf@...radead.org>
Subject: [PATCH 2/2] RFCv2: ipv4: share sysctl net/ipv4/conf/DEVNAME/ tables

Before this, for each network device DEVNAME that supports ipv4 a new
sysctl table was registered in $PROC/sys/net/ipv4/conf/DEVNAME/.

The sysctl table was identical for all network devices, except for:
* data: pointer to the data to be accessed in the sysctl
* extra1: the 'struct ipv4_devconf*' of the network device
* extra2: the 'struct net*' of the network namespace

Assuming we have a device name and a 'struct net*', we can get the
'struct net_device*'. From there we can compute:
* data:
* extra1: 'struct ipv4_devconf*' can be reached from 'struct net_device*'
* extra2: the 'struct net*' that we assume we have

The device name is determined from the path to the file (the name of
the parent dentry).

The 'struct net*' is stored in the parent 'struct ctl_table*' path by
register_net_sysctl_table_pathdata().

NOTE: this breaks ctl_table->parent: the last registered net device
will be the parent of any $PROC/sys/net/ipv4/conf/DEVNAME/$CTL
ctl_table and selinux may behave in a wrong way because of this.
This is just a RFC patch at the moment.

Signed-off-by: Lucian Adrian Grijincu <lucian.grijincu@...il.com>
---
 fs/proc/proc_sysctl.c      |   16 +++-
 include/linux/inetdevice.h |   12 +++-
 net/ipv4/devinet.c         |  203 +++++++++++++++++++++++++++++---------------
 3 files changed, 161 insertions(+), 70 deletions(-)

View attachment "0002-RFCv2-ipv4-share-sysctl-net-ipv4-conf-DEVNAME-tables.patch" of type "text/x-patch" (12417 bytes)