• Robert Shearman's avatar
    mpls: allow TTL propagation from IP packets to be configured · a59166e4
    Robert Shearman authored
    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: default avatarRobert Shearman <rshearma@brocade.com>
    Acked-by: default avatarDavid Ahern <dsa@cumulusnetworks.com>
    Tested-by: default avatarDavid Ahern <dsa@cumulusnetworks.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    a59166e4
mpls-sysctl.txt 1.43 KB