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linux/Documentation/networking/mpls-sysctl.txt

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mpls: Add a sysctl to control the size of the mpls label table This sysctl gives two benefits. By defaulting the table size to 0 mpls even when compiled in and enabled defaults to not forwarding any packets. This prevents unpleasant surprises for users. The other benefit is that as mpls labels are allocated locally a dense table a small dense label table may be used which saves memory and is extremely simple and efficient to implement. This sysctl allows userspace to choose the restrictions on the label table size userspace applications need to cope with. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-03-04 09:11:20 +08:00
/proc/sys/net/mpls/* Variables:
platform_labels - INTEGER
Number of entries in the platform label table. It is not
possible to configure forwarding for label values equal to or
greater than the number of platform labels.
A dense utliziation of the entries in the platform label table
is possible and expected aas the platform labels are locally
allocated.
If the number of platform label table entries is set to 0 no
label will be recognized by the kernel and mpls forwarding
will be disabled.
Reducing this value will remove all label routing entries that
no longer fit in the table.
Possible values: 0 - 1048575
Default: 0
mpls: Per-device enabling of packet input An MPLS network is a single trust domain where the edges must be in control of what labels make their way into the core. The simplest way of ensuring this is for the edge device to always impose the labels, and not allow forward labeled traffic from untrusted neighbours. This is achieved by allowing a per-device configuration of whether MPLS traffic input from that interface should be processed or not. To be secure by default, the default state is changed to MPLS being disabled on all interfaces unless explicitly enabled and no global option is provided to change the default. Whilst this differs from other protocols (e.g. IPv6), network operators are used to explicitly enabling MPLS forwarding on interfaces, and with the number of links to the MPLS core typically fairly low this doesn't present too much of a burden on operators. Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Robert Shearman <rshearma@brocade.com> Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-04-22 18:14:38 +08:00
conf/<interface>/input - BOOL
Control whether packets can be input on this interface.
If disabled, packets will be discarded without further
processing.
0 - disabled (default)
not 0 - enabled