a59166e470
Allow TTL propagation from IP packets to MPLS packets to be configured. Add a new optional LWT attribute, MPLS_IPTUNNEL_TTL, which allows the TTL to be set in the resulting MPLS packet, with the value of 0 having the semantics of enabling propagation of the TTL from the IP header (i.e. non-zero values disable propagation). Also allow the configuration to be overridden globally by reusing the same sysctl to control whether the TTL is propagated from IP packets into the MPLS header. If the per-LWT attribute is set then it overrides the global configuration. If the TTL isn't propagated then a default TTL value is used which can be configured via a new sysctl, "net.mpls.default_ttl". This is kept separate from the configuration of whether IP TTL propagation is enabled as it can be used in the future when non-IP payloads are supported (i.e. where there is no payload TTL that can be propagated). Signed-off-by: Robert Shearman <rshearma@brocade.com> Acked-by: David Ahern <dsa@cumulusnetworks.com> Tested-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
48 lines
1.4 KiB
Text
48 lines
1.4 KiB
Text
/proc/sys/net/mpls/* Variables:
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platform_labels - INTEGER
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Number of entries in the platform label table. It is not
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possible to configure forwarding for label values equal to or
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greater than the number of platform labels.
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A dense utilization of the entries in the platform label table
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is possible and expected as the platform labels are locally
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allocated.
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If the number of platform label table entries is set to 0 no
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label will be recognized by the kernel and mpls forwarding
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will be disabled.
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Reducing this value will remove all label routing entries that
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no longer fit in the table.
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Possible values: 0 - 1048575
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Default: 0
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ip_ttl_propagate - BOOL
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Control whether TTL is propagated from the IPv4/IPv6 header to
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the MPLS header on imposing labels and propagated from the
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MPLS header to the IPv4/IPv6 header on popping the last label.
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If disabled, the MPLS transport network will appear as a
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single hop to transit traffic.
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0 - disabled / RFC 3443 [Short] Pipe Model
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1 - enabled / RFC 3443 Uniform Model (default)
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default_ttl - BOOL
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Default TTL value to use for MPLS packets where it cannot be
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propagated from an IP header, either because one isn't present
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or ip_ttl_propagate has been disabled.
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Possible values: 1 - 255
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Default: 255
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conf/<interface>/input - BOOL
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Control whether packets can be input on this interface.
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If disabled, packets will be discarded without further
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processing.
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0 - disabled (default)
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not 0 - enabled
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