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/*
* Copyright (c) 2016 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.
*/
/**
* @brief The IPv4 FIB
*
* FIBs are composed of two prefix data-bases (akak tables). The non-forwarding
* table contains all the routes that the control plane has programmed, the
* forwarding table contains the sub-set of those routes that can be used to
* forward packets.
* In the IPv4 FIB the non-forwarding table is an array of hash tables indexed
* by mask length, the forwarding table is an mtrie
*
* This IPv4 FIB is used by the protocol independent FIB. So directly using
* this APIs in client code is not encouraged. However, this IPv4 FIB can be
* used if all the client wants is an IPv4 prefix data-base
*/
#ifndef __IP4_FIB_H__
#define __IP4_FIB_H__
#include <vlib/vlib.h>
#include <vnet/ip/ip.h>
#include <vnet/fib/fib_entry.h>
#include <vnet/fib/fib_table.h>
#include <vnet/ip/ip4_mtrie.h>
typedef struct ip4_fib_t_
{
/**
* Mtrie for fast lookups. Hash is used to maintain overlapping prefixes.
* First member so it's in the first cacheline.
*/
ip4_fib_mtrie_t mtrie;
/* Hash table for each prefix length mapping. */
uword *fib_entry_by_dst_address[33];
/* Table ID (hash key) for this FIB. */
u32 table_id;
/* Index into FIB vector. */
u32 index;
/* N-tuple classifier indices */
u32 fwd_classify_table_index;
u32 rev_classify_table_index;
} ip4_fib_t;
extern fib_node_index_t ip4_fib_table_lookup(const ip4_fib_t *fib,
const ip4_address_t *addr,
u32 len);
extern fib_node_index_t ip4_fib_table_lookup_exact_match(const ip4_fib_t *fib,
const ip4_address_t *addr,
u32 len);
extern void ip4_fib_table_entry_remove(ip4_fib_t *fib,
const ip4_address_t *addr,
u32 len);
extern void ip4_fib_table_entry_insert(ip4_fib_t *fib,
const ip4_address_t *addr,
u32 len,
fib_node_index_t fib_entry_index);
extern void ip4_fib_table_destroy(u32 fib_index);
extern void ip4_fib_table_fwding_dpo_update(ip4_fib_t *fib,
const ip4_address_t *addr,
u32 len,
const dpo_id_t *dpo);
extern void ip4_fib_table_fwding_dpo_remove(ip4_fib_t *fib,
const ip4_address_t *addr,
u32 len,
const dpo_id_t *dpo,
fib_node_index_t cover_index);
extern u32 ip4_fib_table_lookup_lb (ip4_fib_t *fib,
const ip4_address_t * dst);
/**
* @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 ip4_fib_table_walk(ip4_fib_t *fib,
fib_table_walk_fn_t fn,
void *ctx);
/**
* @brief Get the FIB at the given index
*/
static inline ip4_fib_t *
ip4_fib_get (u32 index)
{
return (pool_elt_at_index(ip4_main.v4_fibs, index));
}
always_inline u32
ip4_fib_lookup (ip4_main_t * im, u32 sw_if_index, ip4_address_t * dst)
{
return (ip4_fib_table_lookup_lb(
ip4_fib_get(vec_elt (im->fib_index_by_sw_if_index, sw_if_index)),
dst));
}
/**
* @brief Get or create an IPv4 fib.
*
* Get or create an IPv4 fib with the provided table ID.
*
* @param table_id
* When set to \c ~0, an arbitrary and unused fib ID is picked
* and can be retrieved with \c ret->table_id.
* Otherwise, the fib ID to be used to retrieve or create the desired fib.
* @returns A pointer to the retrieved or created fib.
*
*/
extern u32 ip4_fib_table_find_or_create_and_lock(u32 table_id);
extern u32 ip4_fib_table_create_and_lock(void);
static inline
u32 ip4_fib_index_from_table_id (u32 table_id)
{
ip4_main_t * im = &ip4_main;
uword * p;
p = hash_get (im->fib_index_by_table_id, table_id);
if (!p)
return ~0;
return p[0];
}
extern u32 ip4_fib_table_get_index_for_sw_if_index(u32 sw_if_index);
always_inline index_t
ip4_fib_forwarding_lookup (u32 fib_index,
const ip4_address_t * addr)
{
ip4_fib_mtrie_leaf_t leaf;
ip4_fib_mtrie_t * mtrie;
mtrie = &ip4_fib_get(fib_index)->mtrie;
leaf = ip4_fib_mtrie_lookup_step_one (mtrie, addr);
leaf = ip4_fib_mtrie_lookup_step (mtrie, leaf, addr, 2);
leaf = ip4_fib_mtrie_lookup_step (mtrie, leaf, addr, 3);
return (ip4_fib_mtrie_leaf_get_adj_index(leaf));
}
#endif
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