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>
diff --git a/src/vnet/adj/adj.c b/src/vnet/adj/adj.c
index 9018200..36dfe50 100644
--- a/src/vnet/adj/adj.c
+++ b/src/vnet/adj/adj.c
@@ -67,6 +67,10 @@
adj->lookup_next_index = 0;
adj->ia_delegates = NULL;
+ /* lest it become a midchain in the future */
+ memset(&adj->sub_type.midchain.next_dpo, 0,
+ sizeof(adj->sub_type.midchain.next_dpo));
+
ip4_main.lookup_main.adjacency_heap = adj_pool;
ip6_main.lookup_main.adjacency_heap = adj_pool;
@@ -118,6 +122,9 @@
case IP_LOOKUP_NEXT_MCAST:
s = format (s, "%U", format_adj_mcast, adj_index, 0);
break;
+ case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
+ s = format (s, "%U", format_adj_mcast_midchain, adj_index, 0);
+ break;
default:
break;
}
@@ -180,6 +187,7 @@
adj->rewrite_header.sw_if_index);
break;
case IP_LOOKUP_NEXT_MCAST:
+ case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
adj_mcast_remove(adj->ia_nh_proto,
adj->rewrite_header.sw_if_index);
break;
@@ -338,6 +346,7 @@
FOR_EACH_FIB_IP_PROTOCOL(proto)
{
adj_nbr_walk(sw_if_index, proto, cb, ctx);
+ adj_mcast_walk(sw_if_index, proto, cb, ctx);
}
}
@@ -544,9 +553,9 @@
* [@0]
* [@1] glean: loop0
* [@2] ipv4 via 1.0.0.2 loop0: IP4: 00:00:22:aa:bb:cc -> 00:00:11:aa:bb:cc
- * [@3] mpls via 1.0.0.2 loop0: MPLS_UNICAST: 00:00:22:aa:bb:cc -> 00:00:11:aa:bb:cc
+ * [@3] mpls via 1.0.0.2 loop0: MPLS: 00:00:22:aa:bb:cc -> 00:00:11:aa:bb:cc
* [@4] ipv4 via 1.0.0.3 loop0: IP4: 00:00:22:aa:bb:cc -> 00:00:11:aa:bb:cc
- * [@5] mpls via 1.0.0.3 loop0: MPLS_UNICAST: 00:00:22:aa:bb:cc -> 00:00:11:aa:bb:cc
+ * [@5] mpls via 1.0.0.3 loop0: MPLS: 00:00:22:aa:bb:cc -> 00:00:11:aa:bb:cc
* @cliexend
?*/
VLIB_CLI_COMMAND (adj_show_command, static) = {
diff --git a/src/vnet/adj/adj.h b/src/vnet/adj/adj.h
index 32997c9..ed5eb1f 100644
--- a/src/vnet/adj/adj.h
+++ b/src/vnet/adj/adj.h
@@ -81,6 +81,10 @@
/** Multicast Adjacency. */
IP_LOOKUP_NEXT_MCAST,
+ /** Multicast Midchain Adjacency. An Adjacency for sending macst packets
+ * on a tunnel/virtual interface */
+ IP_LOOKUP_NEXT_MCAST_MIDCHAIN,
+
IP_LOOKUP_N_NEXT,
} __attribute__ ((packed)) ip_lookup_next_t;
@@ -107,6 +111,7 @@
[IP_LOOKUP_NEXT_REWRITE] = "ip4-rewrite", \
[IP_LOOKUP_NEXT_MCAST] = "ip4-rewrite-mcast", \
[IP_LOOKUP_NEXT_MIDCHAIN] = "ip4-midchain", \
+ [IP_LOOKUP_NEXT_MCAST_MIDCHAIN] = "ip4-mcast-midchain", \
[IP_LOOKUP_NEXT_ICMP_ERROR] = "ip4-icmp-error", \
}
@@ -119,6 +124,7 @@
[IP_LOOKUP_NEXT_REWRITE] = "ip6-rewrite", \
[IP_LOOKUP_NEXT_MCAST] = "ip6-rewrite-mcast", \
[IP_LOOKUP_NEXT_MIDCHAIN] = "ip6-midchain", \
+ [IP_LOOKUP_NEXT_MCAST_MIDCHAIN] = "ip6-mcast-midchain", \
[IP_LOOKUP_NEXT_ICMP_ERROR] = "ip6-icmp-error", \
[IP6_LOOKUP_NEXT_HOP_BY_HOP] = "ip6-hop-by-hop", \
[IP6_LOOKUP_NEXT_ADD_HOP_BY_HOP] = "ip6-add-hop-by-hop", \
diff --git a/src/vnet/adj/adj_internal.h b/src/vnet/adj/adj_internal.h
index 3066862..2c123c5 100644
--- a/src/vnet/adj/adj_internal.h
+++ b/src/vnet/adj/adj_internal.h
@@ -17,6 +17,7 @@
#define __ADJ_INTERNAL_H__
#include <vnet/adj/adj.h>
+#include <vnet/adj/adj_mcast.h>
#include <vnet/ip/ip.h>
#include <vnet/mpls/mpls.h>
#include <vnet/adj/adj_l2.h>
@@ -87,11 +88,14 @@
return (adj - adj_pool);
}
-extern void adj_nbr_update_rewrite_internal (ip_adjacency_t *adj,
- ip_lookup_next_t adj_next_index,
- u32 complete_next_index,
- u32 next_index,
- u8 *rewrite);
+extern void adj_nbr_update_rewrite_internal(ip_adjacency_t *adj,
+ ip_lookup_next_t adj_next_index,
+ u32 complete_next_index,
+ u32 next_index,
+ u8 *rewrite);
+extern void adj_midchain_setup(adj_index_t adj_index,
+ adj_midchain_fixup_t fixup,
+ adj_flags_t flags);
extern ip_adjacency_t * adj_alloc(fib_protocol_t proto);
diff --git a/src/vnet/adj/adj_mcast.c b/src/vnet/adj/adj_mcast.c
index 4f678e4..755abfd 100644
--- a/src/vnet/adj/adj_mcast.c
+++ b/src/vnet/adj/adj_mcast.c
@@ -13,7 +13,7 @@
* limitations under the License.
*/
-#include <vnet/adj/adj.h>
+#include <vnet/adj/adj_mcast.h>
#include <vnet/adj/adj_internal.h>
#include <vnet/fib/fib_walk.h>
#include <vnet/ip/ip.h>
@@ -129,6 +129,59 @@
adj->rewrite_header.dst_mcast_mask = clib_host_to_net_u32(mask);
}
+/**
+ * adj_mcast_midchain_update_rewrite
+ *
+ * Update the adjacency's rewrite string. A NULL string implies the
+ * rewirte is reset (i.e. when ARP/ND etnry is gone).
+ * NB: the adj being updated may be handling traffic in the DP.
+ */
+void
+adj_mcast_midchain_update_rewrite (adj_index_t adj_index,
+ adj_midchain_fixup_t fixup,
+ adj_flags_t flags,
+ u8 *rewrite,
+ u8 offset,
+ u32 mask)
+{
+ ip_adjacency_t *adj;
+
+ ASSERT(ADJ_INDEX_INVALID != adj_index);
+
+ adj = adj_get(adj_index);
+
+ /*
+ * one time only update. since we don't support chainging the tunnel
+ * src,dst, this is all we need.
+ */
+ ASSERT(adj->lookup_next_index == IP_LOOKUP_NEXT_MCAST);
+ /*
+ * tunnels can always provide a rewrite.
+ */
+ ASSERT(NULL != rewrite);
+
+ adj_midchain_setup(adj_index, fixup, flags);
+
+ /*
+ * update the adj's rewrite string and build the arc
+ * from the rewrite node to the interface's TX node
+ */
+ adj_nbr_update_rewrite_internal(adj, IP_LOOKUP_NEXT_MCAST_MIDCHAIN,
+ adj_get_mcast_node(adj->ia_nh_proto),
+ vnet_tx_node_index_for_sw_interface(
+ vnet_get_main(),
+ adj->rewrite_header.sw_if_index),
+ rewrite);
+
+ /*
+ * set the fields corresponding to the mcast IP address rewrite
+ * The mask must be stored in network byte order, since the packet's
+ * IP address will also be in network order.
+ */
+ adj->rewrite_header.dst_mcast_offset = offset;
+ adj->rewrite_header.dst_mcast_mask = clib_host_to_net_u32(mask);
+}
+
void
adj_mcast_remove (fib_protocol_t proto,
u32 sw_if_index)
@@ -260,6 +313,24 @@
VNET_SW_INTERFACE_ADD_DEL_FUNCTION(adj_mcast_interface_delete);
+/**
+ * @brief Walk the multicast Adjacencies on a given interface
+ */
+void
+adj_mcast_walk (u32 sw_if_index,
+ fib_protocol_t proto,
+ adj_walk_cb_t cb,
+ void *ctx)
+{
+ if (vec_len(adj_mcasts[proto]) > sw_if_index)
+ {
+ if (ADJ_INDEX_INVALID != adj_mcasts[proto][sw_if_index])
+ {
+ cb(adj_mcasts[proto][sw_if_index], ctx);
+ }
+ }
+}
+
u8*
format_adj_mcast (u8* s, va_list *ap)
{
@@ -269,6 +340,8 @@
s = format(s, "%U-mcast: ",
format_fib_protocol, adj->ia_nh_proto);
+ if (adj->rewrite_header.flags & VNET_REWRITE_HAS_FEATURES)
+ s = format(s, "[features] ");
s = format (s, "%U",
format_vnet_rewrite,
&adj->rewrite_header, sizeof (adj->rewrite_data), 0);
@@ -276,6 +349,28 @@
return (s);
}
+u8*
+format_adj_mcast_midchain (u8* s, va_list *ap)
+{
+ index_t index = va_arg(*ap, index_t);
+ CLIB_UNUSED(u32 indent) = va_arg(*ap, u32);
+ vnet_main_t * vnm = vnet_get_main();
+ ip_adjacency_t * adj = adj_get(index);
+
+ s = format(s, "%U-mcast-midchain: ",
+ format_fib_protocol, adj->ia_nh_proto);
+ s = format (s, "%U",
+ format_vnet_rewrite,
+ vnm->vlib_main, &adj->rewrite_header,
+ sizeof (adj->rewrite_data), 0);
+ s = format (s, "\n%Ustacked-on:\n%U%U",
+ format_white_space, indent,
+ format_white_space, indent+2,
+ format_dpo_id, &adj->sub_type.midchain.next_dpo, indent+2);
+
+ return (s);
+}
+
static void
adj_dpo_lock (dpo_id_t *dpo)
@@ -293,6 +388,11 @@
.dv_unlock = adj_dpo_unlock,
.dv_format = format_adj_mcast,
};
+const static dpo_vft_t adj_mcast_midchain_dpo_vft = {
+ .dv_lock = adj_dpo_lock,
+ .dv_unlock = adj_dpo_unlock,
+ .dv_format = format_adj_mcast_midchain,
+};
/**
* @brief The per-protocol VLIB graph nodes that are assigned to a mcast
@@ -320,6 +420,31 @@
};
/**
+ * @brief The per-protocol VLIB graph nodes that are assigned to a mcast
+ * object.
+ *
+ * this means that these graph nodes are ones from which a mcast is the
+ * parent object in the DPO-graph.
+ */
+const static char* const adj_mcast_midchain_ip4_nodes[] =
+{
+ "ip4-mcast-midchain",
+ NULL,
+};
+const static char* const adj_mcast_midchain_ip6_nodes[] =
+{
+ "ip6-mcast-midchain",
+ NULL,
+};
+
+const static char* const * const adj_mcast_midchain_nodes[DPO_PROTO_NUM] =
+{
+ [DPO_PROTO_IP4] = adj_mcast_midchain_ip4_nodes,
+ [DPO_PROTO_IP6] = adj_mcast_midchain_ip6_nodes,
+ [DPO_PROTO_MPLS] = NULL,
+};
+
+/**
* @brief Return the size of the adj DB.
* This is only for testing purposes so an efficient implementation is not needed
*/
@@ -349,5 +474,10 @@
void
adj_mcast_module_init (void)
{
- dpo_register(DPO_ADJACENCY_MCAST, &adj_mcast_dpo_vft, adj_mcast_nodes);
+ dpo_register(DPO_ADJACENCY_MCAST,
+ &adj_mcast_dpo_vft,
+ adj_mcast_nodes);
+ dpo_register(DPO_ADJACENCY_MCAST_MIDCHAIN,
+ &adj_mcast_midchain_dpo_vft,
+ adj_mcast_midchain_nodes);
}
diff --git a/src/vnet/adj/adj_mcast.h b/src/vnet/adj/adj_mcast.h
index 40d4431..bfb0d6f 100644
--- a/src/vnet/adj/adj_mcast.h
+++ b/src/vnet/adj/adj_mcast.h
@@ -26,6 +26,7 @@
#define __ADJ_MCAST_H__
#include <vnet/adj/adj_types.h>
+#include <vnet/adj/adj_midchain.h>
/**
* @brief
@@ -69,9 +70,35 @@
u32 mask);
/**
+ * @brief
+ * Update the rewrite string for an existing adjacecny and
+ * Convert the adjacency into a midchain
+ *
+ * @param
+ * The index of the adj to update
+ *
+ * @param
+ * The new rewrite
+ */
+extern void adj_mcast_midchain_update_rewrite(adj_index_t adj_index,
+ adj_midchain_fixup_t fixup,
+ adj_flags_t flags,
+ u8 *rewrite,
+ u8 offset,
+ u32 mask);
+/**
+ * @brief Walk the multicast Adjacencies on a given interface
+ */
+extern void adj_mcast_walk (u32 sw_if_index,
+ fib_protocol_t adj_nh_proto,
+ adj_walk_cb_t cb,
+ void *ctx);
+
+/**
* @brief Format/display a mcast adjacency.
*/
extern u8* format_adj_mcast(u8* s, va_list *ap);
+extern u8* format_adj_mcast_midchain(u8* s, va_list *ap);
/**
* @brief Get the sze of the mcast adj DB. Test purposes only.
diff --git a/src/vnet/adj/adj_midchain.c b/src/vnet/adj/adj_midchain.c
index 5756de4..a93a1c3 100644
--- a/src/vnet/adj/adj_midchain.c
+++ b/src/vnet/adj/adj_midchain.c
@@ -346,7 +346,7 @@
static u8
adj_midchain_get_feature_arc_index_for_link_type (const ip_adjacency_t *adj)
{
- u8 arc = (u8) ~0;
+ u8 arc = (u8) ~0;
switch (adj->ia_link)
{
case VNET_LINK_IP4:
@@ -393,17 +393,14 @@
}
/**
- * adj_nbr_midchain_update_rewrite
+ * adj_midchain_setup
*
- * Update the adjacency's rewrite string. A NULL string implies the
- * rewrite is reset (i.e. when ARP/ND etnry is gone).
- * NB: the adj being updated may be handling traffic in the DP.
+ * Setup the adj as a mid-chain
*/
void
-adj_nbr_midchain_update_rewrite (adj_index_t adj_index,
- adj_midchain_fixup_t fixup,
- adj_flags_t flags,
- u8 *rewrite)
+adj_midchain_setup (adj_index_t adj_index,
+ adj_midchain_fixup_t fixup,
+ adj_flags_t flags)
{
u32 feature_index, tx_node;
ip_adjacency_t *adj;
@@ -413,16 +410,6 @@
adj = adj_get(adj_index);
- /*
- * one time only update. since we don't support chainging the tunnel
- * src,dst, this is all we need.
- */
- ASSERT(adj->lookup_next_index == IP_LOOKUP_NEXT_ARP);
- /*
- * tunnels can always provide a rewrite.
- */
- ASSERT(NULL != rewrite);
-
adj->sub_type.midchain.fixup_func = fixup;
adj->ia_flags |= flags;
@@ -447,6 +434,38 @@
dpo_stack_from_node(tx_node,
&adj->sub_type.midchain.next_dpo,
drop_dpo_get(vnet_link_to_dpo_proto(adj->ia_link)));
+}
+
+/**
+ * adj_nbr_midchain_update_rewrite
+ *
+ * Update the adjacency's rewrite string. A NULL string implies the
+ * rewrite is reset (i.e. when ARP/ND etnry is gone).
+ * NB: the adj being updated may be handling traffic in the DP.
+ */
+void
+adj_nbr_midchain_update_rewrite (adj_index_t adj_index,
+ adj_midchain_fixup_t fixup,
+ adj_flags_t flags,
+ u8 *rewrite)
+{
+ ip_adjacency_t *adj;
+
+ ASSERT(ADJ_INDEX_INVALID != adj_index);
+
+ adj = adj_get(adj_index);
+
+ /*
+ * one time only update. since we don't support chainging the tunnel
+ * src,dst, this is all we need.
+ */
+ ASSERT(adj->lookup_next_index == IP_LOOKUP_NEXT_ARP);
+ /*
+ * tunnels can always provide a rewrite.
+ */
+ ASSERT(NULL != rewrite);
+
+ adj_midchain_setup(adj_index, fixup, flags);
/*
* update the rewirte with the workers paused.
@@ -454,7 +473,7 @@
adj_nbr_update_rewrite_internal(adj,
IP_LOOKUP_NEXT_MIDCHAIN,
adj_get_midchain_node(adj->ia_link),
- tx_node,
+ adj_nbr_midchain_get_tx_node(adj),
rewrite);
}
@@ -496,7 +515,8 @@
adj = adj_get(adj_index);
- ASSERT(IP_LOOKUP_NEXT_MIDCHAIN == adj->lookup_next_index);
+ ASSERT((IP_LOOKUP_NEXT_MIDCHAIN == adj->lookup_next_index) ||
+ (IP_LOOKUP_NEXT_MCAST_MIDCHAIN == adj->lookup_next_index));
dpo_stack_from_node(adj_nbr_midchain_get_tx_node(adj),
&adj->sub_type.midchain.next_dpo,
diff --git a/src/vnet/adj/adj_nbr.c b/src/vnet/adj/adj_nbr.c
index ddacb03..3d450d1 100644
--- a/src/vnet/adj/adj_nbr.c
+++ b/src/vnet/adj/adj_nbr.c
@@ -195,8 +195,6 @@
adj->ia_link = link_type;
adj->ia_nh_proto = nh_proto;
adj->rewrite_header.sw_if_index = sw_if_index;
- memset(&adj->sub_type.midchain.next_dpo, 0,
- sizeof(adj->sub_type.midchain.next_dpo));
adj_nbr_evaluate_feature (adj_get_index(adj));
return (adj);