New: /proc/sys/net/ipv4/route/flush not found

Bugme-new Andrew Morton 3 participants 3 messages Aug 28, 2008 – Aug 29, 2008 1 message not in the archive

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A message that is not in the archive (sent off-list or not yet received): [email protected]/

Andrew Morton

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2008-08-28 20:18 UTC #1 lore raw

(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface).

Quoted 43 lines · On Thu, 28 Aug 2008 11:06:22 -0700 (PDT) [email protected] wrote:

http://bugzilla.kernel.org/show_bug.cgi?id=11447
           Summary: /proc/sys/net/ipv4/route/flush not found
           Product: Networking
           Version: 2.5
     KernelVersion: 2.6.27-rc4-git7
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: IPV4
        AssignedTo: [email protected]
        ReportedBy: [email protected]
Latest working kernel version: 2.6.27-rc4 Earliest failing kernel version: probably 2.6.27-rc4-git7
Distribution: Gentoo
Hardware Environment:
Software Environment:
Problem Description:
When the lo interface is initialized, the following error occurs:
can't open /proc/sys/net/ipv4/route/flush: no such file. After a bisection, it appears that the following commit is the first bad commit:
commit 2f4520d35d89ca6c5cd129c38e3b11f0283b7d1b
Author: Al Viro <[email protected]>
Date:   Mon Aug 25 15:17:44 2008 -0700
ipv4: sysctl fixes
net.ipv4.neigh should be a part of skeleton to avoid ordering problems
Signed-off-by Al Viro <[email protected]>
Signed-off-by David S. Miller <[email protected]>
If I revert it, the problem doesn't occur.

vpnc on today's kernel says Cannot open "/proc/sys/net/ipv4/route/flush":
d--------- 0 root root 0 2008-08-26 11:32 /proc/sys/net/ipv4/route d--------- 0 root root 0 2008-08-26 19:16 /proc/sys/net/ipv4/neigh

Signed-off-by Hugh Dickins <[email protected]>

Acked-by Al Viro <[email protected]>

Signed-off-by David S. Miller <[email protected]>

net/ipv4/route.c +2 -2

index e91bafe..6ee5354 100644
@@ -3121,9 +3121,9 @@ static struct ctl_table empty[1];
 static struct ctl_table ipv4_skeleton[] =
 {
 	{ .procname = "route", .ctl_name = NET_IPV4_ROUTE,
-	  .child = ipv4_route_table},
+	  .mode = 0555, .child = ipv4_route_table},
 	{ .procname = "neigh", .ctl_name = NET_IPV4_NEIGH,
-	  .child = empty},
+	  .mode = 0555, .child = empty},
 	{ }
 };

François Valenduc

2008-08-29 16:36 UTC #3 lore raw

Quoted 34 lines · David Miller

From: Andrew Morton <[email protected]>
Date: Thu, 28 Aug 2008 13:18:24 -0700
Quoted 3 lines
(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface).
Should be fixed in Linus's tree as of an hour ago, it was a permissions issue:
commit d994af0d50efc96b2077978fe9f066992639d525
Author: Hugh Dickins <[email protected]>
Date:   Wed Aug 27 02:35:18 2008 -0700
ipv4: mode 0555 in ipv4_skeleton
vpnc on today's kernel says Cannot open "/proc/sys/net/ipv4/route/flush":
d--------- 0 root root 0 2008-08-26 11:32 /proc/sys/net/ipv4/route d--------- 0 root root 0 2008-08-26 19:16 /proc/sys/net/ipv4/neigh
Signed-off-by Hugh Dickins <[email protected]>
Acked-by Al Viro <[email protected]>
Signed-off-by David S. Miller <[email protected]>
net/ipv4/route.c +0 -0
index e91bafe..6ee5354 100644
@@ -3121,9 +3121,9 @@ static struct ctl_table empty[1];
 static struct ctl_table ipv4_skeleton[] =

net/ipv4/route.c static struct ctl_table empty[1]; · line 3129

Quoted 10 lines

net/ipv4/route.c +2 -2

 {
 	{ .procname = "route", .ctl_name = NET_IPV4_ROUTE,
-	  .child = ipv4_route_table},
+	  .mode = 0555, .child = ipv4_route_table},
 	{ .procname = "neigh", .ctl_name = NET_IPV4_NEIGH,
-	  .child = empty},
+	  .mode = 0555, .child = empty},
 	{ }
 };

This commit indeed solves the problem.