2 * mpls_fib.h: The Label/MPLS FIB
4 * Copyright (c) 2012 Cisco and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #ifndef __MPLS_FIB_TABLE_H__
19 #define __MPLS_FIB_TABLE_H__
21 #include <vnet/vnet.h>
22 #include <vnet/mpls/mpls.h>
23 #include <vnet/fib/fib_types.h>
24 #include <vnet/dpo/dpo.h>
25 #include <vnet/mpls/mpls.h>
26 #include <vnet/fib/fib_table.h>
28 #define MPLS_FIB_DEFAULT_TABLE_ID 0
31 * Type exposure is to allow the DP fast/inlined access
33 #define MPLS_FIB_KEY_SIZE 21
34 #define MPLS_FIB_DB_SIZE (1 << (MPLS_FIB_KEY_SIZE-1))
37 * There are no options for controlling the MPLS flow hash
39 #define MPLS_FLOW_HASH_DEFAULT 0
41 typedef struct mpls_fib_t_
44 * A hash table of entries. 21 bit key
45 * Hash table for reduced memory footprint
50 * The load-balance indices keyed by 21 bit label+eos bit.
51 * A flat array for maximum lookup performace.
53 index_t mf_lbs[MPLS_FIB_DB_SIZE];
56 static inline mpls_fib_t*
57 mpls_fib_get (fib_node_index_t index)
59 return (pool_elt_at_index(mpls_main.mpls_fibs, index));
62 extern u32 mpls_fib_table_find_or_create_and_lock(u32 table_id,
64 extern u32 mpls_fib_table_create_and_lock(fib_source_t src);
65 // extern mpls_fib_t * mpls_fib_find(u32 table_id);
66 extern u32 mpls_fib_index_from_table_id(u32 table_id);
68 extern u8 *format_mpls_fib_table_name(u8 * s, va_list * args);
70 extern fib_node_index_t mpls_fib_table_entry_add_from_ip_fib_entry (
74 fib_node_index_t fib_entry_index);
77 extern fib_node_index_t mpls_fib_table_lookup(const mpls_fib_t *mf,
81 extern void mpls_fib_table_entry_remove(mpls_fib_t *mf,
84 extern void mpls_fib_table_entry_insert(mpls_fib_t *mf,
87 fib_node_index_t fei);
88 extern void mpls_fib_table_destroy(u32 fib_index);
91 extern void mpls_fib_forwarding_table_update(mpls_fib_t *mf,
95 extern void mpls_fib_forwarding_table_reset(mpls_fib_t *mf,
100 * @brief Walk all entries in a FIB table
101 * N.B: This is NOT safe to deletes. If you need to delete walk the whole
102 * table and store elements in a vector, then delete the elements
104 extern void mpls_fib_table_walk(mpls_fib_t *fib,
105 fib_table_walk_fn_t fn,
110 * Lookup a label and EOS bit in the MPLS_FIB table to retrieve the
111 * load-balance index to be used for packet forwarding.
113 static inline index_t
114 mpls_fib_table_forwarding_lookup (u32 mpls_fib_index,
115 const mpls_unicast_header_t *hdr)
121 label = clib_net_to_host_u32(hdr->label_exp_s_ttl);
122 key = (vnet_mpls_uc_get_label(label) << 1) | vnet_mpls_uc_get_s(label);
124 mf = mpls_fib_get(mpls_fib_index);
126 return (mf->mf_lbs[key]);
130 mpls_fib_table_get_index_for_sw_if_index (u32 sw_if_index)
132 mpls_main_t *mm = &mpls_main;
134 ASSERT(vec_len(mm->fib_index_by_sw_if_index) > sw_if_index);
136 return (mm->fib_index_by_sw_if_index[sw_if_index]);