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authorRobert Shearman <rshearma@brocade.com>2017-03-10 23:43:24 +0300
committerDavid S. Miller <davem@davemloft.net>2017-03-14 01:29:22 +0300
commit5b441ac8784c1e7f3c619f14da4c3f52e87348d5 (patch)
treec35721449202da3758d6ed7c6ec4cee19803352a /include/uapi/linux/rtnetlink.h
parentb66239b6824f387361bf18747a7e93760ac3c0fb (diff)
downloadlinux-5b441ac8784c1e7f3c619f14da4c3f52e87348d5.tar.xz
mpls: allow TTL propagation to IP packets to be configured
Provide the ability to control on a per-route basis whether the TTL value from an MPLS packet is propagated to an IPv4/IPv6 packet when the last label is popped as per the theoretical model in RFC 3443 through a new route attribute, RTA_TTL_PROPAGATE which can be 0 to mean disable propagation and 1 to mean enable propagation. In order to provide the ability to change the behaviour for packets arriving with IPv4/IPv6 Explicit Null labels and to provide an easy way for a user to change the behaviour for all existing routes without having to reprogram them, a global knob is provided. This is done through the addition of a new per-namespace sysctl, "net.mpls.ip_ttl_propagate", which defaults to enabled. If the per-route attribute is set (either enabled or disabled) then it overrides the global configuration. 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>
Diffstat (limited to 'include/uapi/linux/rtnetlink.h')
-rw-r--r--include/uapi/linux/rtnetlink.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
index 75fcf5eff093..3dd72aee4d32 100644
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -319,6 +319,7 @@ enum rtattr_type_t {
RTA_EXPIRES,
RTA_PAD,
RTA_UID,
+ RTA_TTL_PROPAGATE,
__RTA_MAX
};