Add rpf lookup for pim6

Fixes #20102

Signed-off-by: Marek Küthe <[email protected]>

Author: marek22k

pimd/pim6_cmd.c

@@ -1837,6 +1837,34 @@ DEFPY_YANG(interface_ipv6_mld_require_ra, interface_ipv6_mld_require_ra_cmd,
 	return nb_cli_apply_changes(vty, FRR_GMP_INTERFACE_XPATH, FRR_PIM_AF_XPATH_VAL);
 }
 
+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]$mode\
+            [{group-list PREFIX_LIST$grp_list|source-list PREFIX_LIST$src_list}]",
+           NO_STR
+           "RPF lookup behavior\n"
+           "Lookup in unicast RIB only\n"
+           "Lookup in multicast RIB only\n"
+           "Try multicast RIB first, fall back to unicast RIB\n"
+           "Lookup both, use entry with lower distance\n"
+           "Lookup both, use entry with longer prefix\n"
+           "Set a specific mode matching group\n"
+           "Multicast group prefix list\n"
+           "Set a specific mode matching source address\n"
+           "Source address prefix list\n")
+{
+	if (no) {
+		nb_cli_enqueue_change(vty, "./mode", NB_OP_DESTROY, NULL);
+		nb_cli_enqueue_change(vty, ".", NB_OP_DESTROY, NULL);
+	} else {
+		nb_cli_enqueue_change(vty, ".", NB_OP_CREATE, NULL);
+		nb_cli_enqueue_change(vty, "./mode", NB_OP_MODIFY, mode);
+	}
+
+	return nb_cli_apply_changes(vty, "./mcast-rpf-lookup[group-list='%s'][source-list='%s']",
+				    (grp_list ? grp_list : ""), (src_list ? src_list : ""));
+}
+
 DEFPY (show_ipv6_pim_rp,
        show_ipv6_pim_rp_cmd,
        "show ipv6 pim [vrf NAME] rp-info [X:X::X:X/M$group] [json$json]",