/* * mpls_fib.h: The Label/MPLS FIB * * Copyright (c) 2012 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef __MPLS_FIB_TABLE_H__ #define __MPLS_FIB_TABLE_H__ #include <vnet/vnet.h> #include <vnet/mpls/mpls.h> #include <vnet/fib/fib_types.h> #include <vnet/dpo/dpo.h> #include <vnet/mpls/mpls.h> #include <vnet/fib/fib_table.h> #define MPLS_FIB_DEFAULT_TABLE_ID 0 /** * Type exposure is to allow the DP fast/inlined access */ #define MPLS_FIB_KEY_SIZE 21 #define MPLS_FIB_DB_SIZE (1 << MPLS_FIB_KEY_SIZE) /** * There are no options for controlling the MPLS flow hash, * but since it mostly entails using IP data to create one, use that. */ #define MPLS_FLOW_HASH_DEFAULT IP_FLOW_HASH_DEFAULT typedef struct mpls_fib_t_ { /** * Required for pool_get_aligned */ CLIB_CACHE_LINE_ALIGN_MARK(cacheline0); /** * A hash table of entries. 21 bit key * Hash table for reduced memory footprint */ uword * mf_entries; /** * The load-balance indices keyed by 21 bit label+eos bit. * A flat array for maximum lookup performance. */ index_t mf_lbs[MPLS_FIB_DB_SIZE]; } mpls_fib_t; static inline mpls_fib_t* mpls_fib_get (fib_node_index_t index) { return (pool_elt_at_index(mpls_main.mpls_fibs, index)); } extern u32 mpls_fib_table_find_or_create_and_lock(u32 table_id, fib_source_t src); extern u32 mpls_fib_table_create_and_lock(fib_source_t src); // extern mpls_fib_t * mpls_fib_find(u32 table_id); extern u32 mpls_fib_index_from_table_id(u32 table_id); extern u8 *format_mpls_fib_table_name(u8 * s, va_list * args); extern fib_node_index_t mpls_fib_table_entry_add_from_ip_fib_entry ( u32 table_id, mpls_label_t label, mpls_eos_bit_t eos, fib_node_index_t fib_entry_index); extern fib_node_index_t mpls_fib_table_lookup(const mpls_fib_t *mf, mpls_label_t label, mpls_eos_bit_t eos); extern void mpls_fib_table_entry_remove(mpls_fib_t *mf, mpls_label_t label, mpls_eos_bit_t eos); extern void mpls_fib_table_entry_insert(mpls_fib_t *mf, mpls_label_t label, mpls_eos_bit_t eos, fib_node_index_t fei); extern void mpls_fib_table_destroy(u32 fib_index); extern void mpls_fib_forwarding_table_update(mpls_fib_t *mf, mpls_label_t label, mpls_eos_bit_t eos, const dpo_id_t *dpo); extern void mpls_fib_forwarding_table_reset(mpls_fib_t *mf, mpls_label_t label, mpls_eos_bit_t eos); /** * @brief Walk all entries in a FIB table * N.B: This is NOT safe to deletes. If you need to delete walk the whole * table and store elements in a vector, then delete the elements */ extern void mpls_fib_table_walk(mpls_fib_t *fib, fib_table_walk_fn_t fn, void *ctx); extern u8 *format_mpls_fib_table_memory(u8 * s, va_list * args); /** * @brief * Lookup a label and EOS bit in the MPLS_FIB table to retrieve the * load-balance index to be used for packet forwarding. */ static inline index_t mpls_fib_table_forwarding_lookup (u32 mpls_fib_index, const mpls_unicast_header_t *hdr) { mpls_label_t label; mpls_fib_t *mf; u32 key; label = clib_net_to_host_u32(hdr->label_exp_s_ttl); key = (vnet_mpls_uc_get_label(label) << 1) | vnet_mpls_uc_get_s(label); mf = mpls_fib_get(mpls_fib_index); return (mf->mf_lbs[key]); } static inline u32 mpls_fib_table_get_index_for_sw_if_index (u32 sw_if_index) { mpls_main_t *mm = &mpls_main; ASSERT(vec_len(mm->fib_index_by_sw_if_index) > sw_if_index); return (mm->fib_index_by_sw_if_index[sw_if_index]); } #endif