pimd,yang: Expand rpf-lookup-mode command

Add options for group-list and source-list, both of which take a prefix list name.
The prefix list is used to determine the lookup mode for specific sources and/or groups.
Any number of lookup modes can be configured as long as the combination of group
and source list is unique.
A global lookup mode (empty group and source lists) is always added and defaults to mrib-then-urib
as it currently functions. The global lookup mode can be changed as it current exists with the command
`rpf-lookup-mode MODE`.
When determinig which mode to use, match source (and group if provided) against the lists, if they are set.
If a lookup does not specify a group, then only use lookup modes that do not have a group list defined.
A lookup by definition will have a source, so no special handling there.

Signed-off-by: Nathan Bahr <nbahr@atcorp.com>

pimd/pim_cmd.c

@@ -8878,21 +8878,31 @@ done:
 }
 
 DEFPY_YANG(pim_rpf_lookup_mode, pim_rpf_lookup_mode_cmd,
-           "[no] rpf-lookup-mode ![urib-only|mrib-only|mrib-then-urib|lower-distance|longer-prefix]$mode",
+           "[no] rpf-lookup-mode\
+            ![urib-only|mrib-only|mrib-then-urib|lower-distance|longer-prefix]$mode\
+            [{group-list PREFIX_LIST$grp_list|source-list PREFIX_LIST$src_list}]",
            NO_STR
            "RPF lookup behavior\n"
            "Lookup in unicast RIB only\n"
            "Lookup in multicast RIB only\n"
            "Try multicast RIB first, fall back to unicast RIB\n"
            "Lookup both, use entry with lower distance\n"
-           "Lookup both, use entry with longer prefix\n")
+           "Lookup both, use entry with longer prefix\n"
+           "Set a specific mode matching group\n"
+           "Multicast group prefix list\n"
+           "Set a specific mode matching source address\n"
+           "Source address prefix list\n")
 {
-	if (no)
-		nb_cli_enqueue_change(vty, "./mcast-rpf-lookup", NB_OP_DESTROY, NULL);
-	else
-		nb_cli_enqueue_change(vty, "./mcast-rpf-lookup", NB_OP_MODIFY, mode);
+	if (no) {
+		nb_cli_enqueue_change(vty, "./mode", NB_OP_DESTROY, NULL);
+		nb_cli_enqueue_change(vty, ".", NB_OP_DESTROY, NULL);
+	} else {
+		nb_cli_enqueue_change(vty, ".", NB_OP_CREATE, NULL);
+		nb_cli_enqueue_change(vty, "./mode", NB_OP_MODIFY, mode);
+	}
 
-	return nb_cli_apply_changes(vty, NULL);
+	return nb_cli_apply_changes(vty, "./mcast-rpf-lookup[group-list='%s'][source-list='%s']",
+				    (grp_list ? grp_list : ""), (src_list ? src_list : ""));
 }
 
 struct cmd_node pim_node = {

pimd/pim_nb.c

@@ -266,7 +266,14 @@ const struct frr_yang_module_info frr_pim_info = {
 		{
 			.xpath = "/frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/mcast-rpf-lookup",
 			.cbs = {
-				.modify = routing_control_plane_protocols_control_plane_protocol_pim_address_family_mcast_rpf_lookup_modify,
+				.create = routing_control_plane_protocols_control_plane_protocol_pim_address_family_mcast_rpf_lookup_create,
+				.destroy = routing_control_plane_protocols_control_plane_protocol_pim_address_family_mcast_rpf_lookup_destroy,
+			}
+		},
+		{
+			.xpath = "/frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/mcast-rpf-lookup/mode",
+			.cbs = {
+				.modify = routing_control_plane_protocols_control_plane_protocol_pim_address_family_mcast_rpf_lookup_mode_modify
 			}
 		},
 		{

pimd/pim_nb.h

@@ -102,7 +102,11 @@ int routing_control_plane_protocols_control_plane_protocol_pim_address_family_re
 	struct nb_cb_modify_args *args);
 int routing_control_plane_protocols_control_plane_protocol_pim_address_family_register_accept_list_destroy(
 	struct nb_cb_destroy_args *args);
-int routing_control_plane_protocols_control_plane_protocol_pim_address_family_mcast_rpf_lookup_modify(
+int routing_control_plane_protocols_control_plane_protocol_pim_address_family_mcast_rpf_lookup_create(
+	struct nb_cb_create_args *args);
+int routing_control_plane_protocols_control_plane_protocol_pim_address_family_mcast_rpf_lookup_destroy(
+	struct nb_cb_destroy_args *args);
+int routing_control_plane_protocols_control_plane_protocol_pim_address_family_mcast_rpf_lookup_mode_modify(
 	struct nb_cb_modify_args *args);
 int lib_interface_pim_address_family_dr_priority_modify(
 	struct nb_cb_modify_args *args);

pimd/pim_nb_config.c

@@ -1895,12 +1895,25 @@ int routing_control_plane_protocols_control_plane_protocol_pim_address_family_re
 /*
  * XPath: /frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/mcast-rpf-lookup
  */
-int routing_control_plane_protocols_control_plane_protocol_pim_address_family_mcast_rpf_lookup_modify(
-	struct nb_cb_modify_args *args)
+int routing_control_plane_protocols_control_plane_protocol_pim_address_family_mcast_rpf_lookup_create(
+	struct nb_cb_create_args *args)
+{
+	switch (args->event) {
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+	case NB_EV_APPLY:
+		break;
+	}
+
+	return NB_OK;
+}
+
+int routing_control_plane_protocols_control_plane_protocol_pim_address_family_mcast_rpf_lookup_destroy(
+	struct nb_cb_destroy_args *args)
 {
 	struct vrf *vrf;
 	struct pim_instance *pim;
-	enum pim_rpf_lookup_mode old_mode;
 
 	switch (args->event) {
 	case NB_EV_VALIDATE:
@@ -1910,15 +1923,37 @@ int routing_control_plane_protocols_control_plane_protocol_pim_address_family_mc
 	case NB_EV_APPLY:
 		vrf = nb_running_get_entry(args->dnode, NULL, true);
 		pim = vrf->info;
-		old_mode = pim->rpf_mode;
-		pim->rpf_mode = yang_dnode_get_enum(args->dnode, NULL);
+		pim_nht_change_rpf_mode(pim, yang_dnode_get_string(args->dnode, "group-list"),
+					yang_dnode_get_string(args->dnode, "source-list"),
+					MCAST_NO_CONFIG);
+		break;
+	}
 
-		if (pim->rpf_mode != old_mode &&
-		    /* MCAST_MIX_MRIB_FIRST is the default if not configured */
-		    (old_mode != MCAST_NO_CONFIG && pim->rpf_mode != MCAST_MIX_MRIB_FIRST)) {
-			pim_nht_mode_changed(pim);
-		}
+	return NB_OK;
+}
 
+/*
+ * XPath: /frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/mcast-rpf-lookup/mode
+ */
+int routing_control_plane_protocols_control_plane_protocol_pim_address_family_mcast_rpf_lookup_mode_modify(
+	struct nb_cb_modify_args *args)
+{
+	struct vrf *vrf;
+	struct pim_instance *pim;
+	enum pim_rpf_lookup_mode mode = MCAST_NO_CONFIG;
+
+	switch (args->event) {
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+
+	case NB_EV_APPLY:
+		vrf = nb_running_get_entry(args->dnode, NULL, true);
+		pim = vrf->info;
+		mode = yang_dnode_get_enum(args->dnode, NULL);
+		pim_nht_change_rpf_mode(pim, yang_dnode_get_string(args->dnode, "../group-list"),
+					yang_dnode_get_string(args->dnode, "../source-list"), mode);
 		break;
 	}
 

pimd/pim_nht.c

@@ -161,6 +161,20 @@ static struct pim_nexthop_cache_rib *pim_pnc_get_rib(struct pim_instance *pim,
 	return pnc_rib;
 }
 
+
+void pim_nht_change_rpf_mode(struct pim_instance *pim, const char *group_plist,
+			     const char *source_plist, enum pim_rpf_lookup_mode mode)
+{
+	/* TODO */
+}
+
+
+int pim_lookup_mode_write(struct pim_instance *pim, struct vty *vty)
+{
+	/* TODO */
+	return 0;
+}
+
 bool pim_nht_pnc_is_valid(struct pim_instance *pim, struct pim_nexthop_cache *pnc)
 {
 	switch (pim->rpf_mode) {

pimd/pim_nht.h

@@ -54,6 +54,13 @@ struct pnc_hash_walk_data {
 	struct interface *ifp;
 };
 
+/* Change the RPF lookup config, may trigger updates to RP's and Upstreams registered for matching cache entries */
+void pim_nht_change_rpf_mode(struct pim_instance *pim, const char *group_plist,
+			     const char *source_plist, enum pim_rpf_lookup_mode mode);
+
+/* Write the rpf lookup mode configuration */
+int pim_lookup_mode_write(struct pim_instance *pim, struct vty *vty);
+
 /* Verify that we have nexthop information in the cache entry */
 bool pim_nht_pnc_is_valid(struct pim_instance *pim, struct pim_nexthop_cache *pnc);
 

pimd/pim_vty.c

@@ -29,6 +29,7 @@
 #include "pim_bfd.h"
 #include "pim_bsm.h"
 #include "pim_vxlan.h"
+#include "pim_nht.h"
 #include "pim6_mld.h"
 
 int pim_debug_config_write(struct vty *vty)
@@ -275,15 +276,7 @@ int pim_global_config_write_worker(struct pim_instance *pim, struct vty *vty)
 		}
 	}
 
-	if (pim->rpf_mode != MCAST_NO_CONFIG) {
-		++writes;
-		vty_out(vty, " rpf-lookup-mode %s\n",
-			pim->rpf_mode == MCAST_URIB_ONLY	? "urib-only"
-			: pim->rpf_mode == MCAST_MRIB_ONLY	? "mrib-only"
-			: pim->rpf_mode == MCAST_MIX_MRIB_FIRST ? "mrib-then-urib"
-			: pim->rpf_mode == MCAST_MIX_DISTANCE	? "lower-distance"
-								: "longer-prefix");
-	}
+	writes += pim_lookup_mode_write(pim, vty);
 
 	return writes;
 }

yang/frr-pim.yang

@@ -202,11 +202,29 @@ module frr-pim {
     description
       "A grouping defining per address family pim global attributes";
 
-    leaf mcast-rpf-lookup {
-      type mcast-rpf-lookup-mode;
-      default "none";
+    list mcast-rpf-lookup {
+      key "group-list source-list";
       description
-        "Multicast RPF lookup behavior.";
+        "RPF lookup modes.";
+
+      leaf group-list {
+        type plist-ref;
+        description
+          "Multicast group prefix list.";
+      }
+
+      leaf source-list {
+        type plist-ref;
+        description
+          "Unicast source address prefix list.";
+      }
+
+      leaf mode {
+        type mcast-rpf-lookup-mode;
+        default "none";
+        description
+          "Multicast RPF lookup behavior.";
+      }
     }
 
     leaf ecmp {