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authorNeale Ranns <nranns@cisco.com>2017-03-01 15:12:11 -0800
committerNeale Ranns <nranns@cisco.com>2017-04-07 09:12:12 +0000
commit0f26c5a0138ac86d7ebd197c31a09d8d624c35fe (patch)
tree5cee4659885432c439e44d7346fd5e482df5f0e6 /src/vnet/fib/fib_entry.c
parentc14f31c2c62fb66d98aef4402a6f1bda09683fd3 (diff)
MPLS Mcast
1 - interface-DPO Used in the Data-plane to change a packet's input interface 2 - MPLS multicast FIB entry Same as a unicast entry but it links to a replicate not a load-balance DPO 3 - Multicast MPLS tunnel Update MPLS tunnels to use a FIB path-list to describe the endpoint[s]. Use the path-list to generate the forwarding chain (DPOs) to link to . 4 - Resolve a path via a local label (of an mLDP LSP) For IP multicast entries to use an LSP in the replication list, we need to decribe the 'resolve-via-label' where the label is that of a multicast LSP. 5 - MPLS disposition path sets RPF-ID For a interface-less LSP (i.e. mLDP not RSVP-TE) at the tail of the LSP we still need to perform an RPF check. An MPLS disposition DPO performs the MPLS pop validation checks and sets the RPF-ID in the packet. 6 - RPF check with per-entry RPF-ID An RPF-ID is used instead of a real interface SW if index in the case the IP traffic arrives from an LSP that does not have an associated interface. Change-Id: Ib92e177be919147bafeb599729abf3d1abc2f4b3 Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'src/vnet/fib/fib_entry.c')
-rw-r--r--src/vnet/fib/fib_entry.c47
1 files changed, 40 insertions, 7 deletions
diff --git a/src/vnet/fib/fib_entry.c b/src/vnet/fib/fib_entry.c
index dac1fce995f..6f811aa1414 100644
--- a/src/vnet/fib/fib_entry.c
+++ b/src/vnet/fib/fib_entry.c
@@ -75,13 +75,7 @@ fib_entry_get_default_chain_type (const fib_entry_t *fib_entry)
return (FIB_FORW_CHAIN_TYPE_UNICAST_IP6);
case FIB_PROTOCOL_MPLS:
if (MPLS_EOS == fib_entry->fe_prefix.fp_eos)
- /*
- * If the entry being asked is a eos-MPLS label entry,
- * then use the payload-protocol field, that we stashed there
- * for just this purpose
- */
- return (fib_forw_chain_type_from_dpo_proto(
- fib_entry->fe_prefix.fp_payload_proto));
+ return (FIB_FORW_CHAIN_TYPE_MPLS_EOS);
else
return (FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS);
}
@@ -371,6 +365,35 @@ fib_entry_contribute_urpf (fib_node_index_t entry_index,
}
/*
+ * If the client is request a chain for multicast forwarding then swap
+ * the chain type to one that can provide such transport.
+ */
+static fib_forward_chain_type_t
+fib_entry_chain_type_mcast_to_ucast (fib_forward_chain_type_t fct)
+{
+ switch (fct)
+ {
+ case FIB_FORW_CHAIN_TYPE_MCAST_IP4:
+ case FIB_FORW_CHAIN_TYPE_MCAST_IP6:
+ /*
+ * we can only transport IP multicast packets if there is an
+ * LSP.
+ */
+ fct = FIB_FORW_CHAIN_TYPE_MPLS_EOS;
+ break;
+ case FIB_FORW_CHAIN_TYPE_MPLS_EOS:
+ case FIB_FORW_CHAIN_TYPE_UNICAST_IP4:
+ case FIB_FORW_CHAIN_TYPE_UNICAST_IP6:
+ case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS:
+ case FIB_FORW_CHAIN_TYPE_ETHERNET:
+ case FIB_FORW_CHAIN_TYPE_NSH:
+ break;
+ }
+
+ return (fct);
+}
+
+/*
* fib_entry_contribute_forwarding
*
* Get an lock the forwarding information (DPO) contributed by the FIB entry.
@@ -385,6 +408,11 @@ fib_entry_contribute_forwarding (fib_node_index_t fib_entry_index,
fib_entry = fib_entry_get(fib_entry_index);
+ /*
+ * mfib children ask for mcast chains. fix these to the appropriate ucast types.
+ */
+ fct = fib_entry_chain_type_mcast_to_ucast(fct);
+
if (fct == fib_entry_get_default_chain_type(fib_entry))
{
dpo_copy(dpo, &fib_entry->fe_lb);
@@ -414,6 +442,11 @@ fib_entry_contribute_forwarding (fib_node_index_t fib_entry_index,
dpo_copy(dpo, &fed->fd_dpo);
}
+ /*
+ * don't allow the special index indicating replicate.vs.load-balance
+ * to escape to the clients
+ */
+ dpo->dpoi_index &= ~MPLS_IS_REPLICATE;
}
const dpo_id_t *