2 * Copyright (c) 2016 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <vnet/mpls/mpls.h>
17 #include <vnet/dpo/mpls_label_dpo.h>
18 #include <vnet/dpo/load_balance.h>
19 #include <vnet/dpo/drop_dpo.h>
21 #include "fib_path_ext.h"
23 #include "fib_path_list.h"
24 #include "fib_internal.h"
27 format_fib_path_ext (u8 * s, va_list * args)
29 fib_path_ext_t *path_ext;
31 path_ext = va_arg (*args, fib_path_ext_t *);
33 s = format(s, "path:%d label:%U",
34 path_ext->fpe_path_index,
35 format_mpls_unicast_label,
36 path_ext->fpe_path.frp_label);
42 fib_path_ext_cmp (fib_path_ext_t *path_ext,
43 const fib_route_path_t *rpath)
45 return (fib_route_path_cmp(&path_ext->fpe_path, rpath));
49 fib_path_ext_match (fib_node_index_t pl_index,
50 fib_node_index_t path_index,
53 fib_path_ext_t *path_ext = ctx;
55 if (!fib_path_cmp_w_route_path(path_index,
58 path_ext->fpe_path_index = path_index;
66 fib_path_ext_resolve (fib_path_ext_t *path_ext,
67 fib_node_index_t path_list_index)
70 * Find the path on the path list that this is an extension for
72 path_ext->fpe_path_index = FIB_NODE_INDEX_INVALID;
73 fib_path_list_walk(path_list_index,
79 fib_path_ext_init (fib_path_ext_t *path_ext,
80 fib_node_index_t path_list_index,
81 const fib_route_path_t *rpath)
83 path_ext->fpe_path = *rpath;
84 path_ext->fpe_path_index = FIB_NODE_INDEX_INVALID;
86 fib_path_ext_resolve(path_ext, path_list_index);
90 fib_path_ext_stack (fib_path_ext_t *path_ext,
91 fib_forward_chain_type_t parent_fct,
92 load_balance_path_t *nhs)
94 fib_forward_chain_type_t child_fct;
95 load_balance_path_t *nh;
97 if (!fib_path_is_resolved(path_ext->fpe_path_index))
101 * Since we are stacking this path-extension, it must have a valid out
102 * label. From the chain type request by the child, determine what
103 * chain type we will request from the parent.
107 case FIB_FORW_CHAIN_TYPE_MPLS_EOS:
109 case FIB_FORW_CHAIN_TYPE_UNICAST_IP4:
110 case FIB_FORW_CHAIN_TYPE_UNICAST_IP6:
111 if (MPLS_IETF_IMPLICIT_NULL_LABEL == path_ext->fpe_label)
114 * implicit-null label for the eos or IP chain, need to pick up
117 child_fct = parent_fct;
122 * we have a label to stack. packets will thus be labelled when
123 * they encounter th child, ergo, non-eos.
125 child_fct = FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS;
128 case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS:
129 child_fct = parent_fct;
136 dpo_id_t via_dpo = DPO_NULL;
139 * The next object in the graph after the imposition of the label
140 * will be the DPO contributed by the path through which the packets
141 * are to be sent. We stack the MPLS Label DPO on this path DPO
143 fib_path_contribute_forwarding(path_ext->fpe_path_index,
147 if (dpo_is_drop(&via_dpo) ||
148 load_balance_is_drop(&via_dpo))
151 * don't stack a path extension on a drop. doing so will create
152 * a LB bucket entry on drop, and we will lose a percentage of traffic.
157 vec_add2(nhs, nh, 1);
158 nh->path_weight = fib_path_get_weight(path_ext->fpe_path_index);
159 nh->path_index = path_ext->fpe_path_index;
160 dpo_copy(&nh->path_dpo, &via_dpo);
163 * The label is stackable for this chain type
164 * construct the mpls header that will be imposed in the data-path
166 if (MPLS_IETF_IMPLICIT_NULL_LABEL != path_ext->fpe_label)
168 dpo_set(&nh->path_dpo,
171 mpls_label_dpo_create(path_ext->fpe_label,
172 (parent_fct == FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS ?