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/*
* Copyright (c) 2015 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.
*/
/*
* ip/ip_lookup.h: ip (4 or 6) lookup structures, adjacencies, ...
*
* Copyright (c) 2008 Eliot Dresselhaus
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef included_ip_lookup_h
#define included_ip_lookup_h
#include <vnet/vnet.h>
#include <vlib/buffer.h>
/* Next index stored in adjacency. */
typedef enum {
/* Packet does not match any route in table. */
IP_LOOKUP_NEXT_MISS,
/* Adjacency says to drop or punt this packet. */
IP_LOOKUP_NEXT_DROP,
IP_LOOKUP_NEXT_PUNT,
/* This packet is for one of our own IP addresses. */
IP_LOOKUP_NEXT_LOCAL,
/* This packet matches an "interface route" and packets
need to be passed to ARP to find rewrite string for
this destination. */
IP_LOOKUP_NEXT_ARP,
/* This packet is to be rewritten and forwarded to the next
processing node. This is typically the output interface but
might be another node for further output processing. */
IP_LOOKUP_NEXT_REWRITE,
/* This packet needs to be classified */
IP_LOOKUP_NEXT_CLASSIFY,
/* This packet needs to go to MAP - RFC7596, RFC7597 */
IP_LOOKUP_NEXT_MAP,
/* This packet needs to go to MAP with Translation - RFC7599 */
IP_LOOKUP_NEXT_MAP_T,
/* This packets needs to go to 6RD (RFC5969) */
IP_LOOKUP_NEXT_SIXRD,
/* Hop-by-hop header handling */
IP_LOOKUP_NEXT_HOP_BY_HOP,
IP_LOOKUP_NEXT_ADD_HOP_BY_HOP,
IP_LOOKUP_NEXT_POP_HOP_BY_HOP,
IP_LOOKUP_N_NEXT,
} ip_lookup_next_t;
/* Flow hash configuration */
#define IP_FLOW_HASH_SRC_ADDR (1<<0)
#define IP_FLOW_HASH_DST_ADDR (1<<1)
#define IP_FLOW_HASH_PROTO (1<<2)
#define IP_FLOW_HASH_SRC_PORT (1<<3)
#define IP_FLOW_HASH_DST_PORT (1<<4)
#define IP_FLOW_HASH_REVERSE_SRC_DST (1<<5)
/* Default: 5-tuple without the "reverse" bit */
#define IP_FLOW_HASH_DEFAULT (0x1F)
#define foreach_flow_hash_bit \
_(src, IP_FLOW_HASH_SRC_ADDR) \
_(dst, IP_FLOW_HASH_DST_ADDR) \
_(sport, IP_FLOW_HASH_SRC_PORT) \
_(dport, IP_FLOW_HASH_DST_PORT) \
_(proto, IP_FLOW_HASH_PROTO) \
_(reverse, IP_FLOW_HASH_REVERSE_SRC_DST)
/* IP unicast adjacency. */
typedef struct {
/* Handle for this adjacency in adjacency heap. */
u32 heap_handle;
/* Interface address index for this local/arp adjacency. */
u32 if_address_index;
/* Number of adjecencies in block. Greater than 1 means multipath;
otherwise equal to 1. */
u16 n_adj;
/* Next hop after ip4-lookup. */
union {
ip_lookup_next_t lookup_next_index : 16;
u16 lookup_next_index_as_int;
};
/* Force re-lookup in a different FIB. ~0 => normal behavior */
i16 explicit_fib_index;
u16 mcast_group_index;
/* When classifying, start here */
u16 classify_table_index;
/* Highest possible perf subgraph arc interposition, e.g. for ip6 ioam */
u16 saved_lookup_next_index;
vnet_declare_rewrite (VLIB_BUFFER_PRE_DATA_SIZE - 5*sizeof(u32));
} ip_adjacency_t;
/* Index into adjacency table. */
typedef u32 ip_adjacency_index_t;
typedef struct {
/* Directly connected next-hop adjacency index. */
u32 next_hop_adj_index;
/* Path weight for this adjacency. */
u32 weight;
} ip_multipath_next_hop_t;
typedef struct {
/* Adjacency index of first index in block. */
u32 adj_index;
/* Power of 2 size of adjacency block. */
u32 n_adj_in_block;
/* Number of prefixes that point to this adjacency. */
u32 reference_count;
/* Normalized next hops are used as hash keys: they are sorted by weight
and weights are chosen so they add up to 1 << log2_n_adj_in_block (with
zero-weighted next hops being deleted).
Unnormalized next hops are saved so that control plane has a record of exactly
what the RIB told it. */
struct {
/* Number of hops in the multipath. */
u32 count;
/* Offset into next hop heap for this block. */
u32 heap_offset;
/* Heap handle used to for example free block when we're done with it. */
u32 heap_handle;
} normalized_next_hops, unnormalized_next_hops;
} ip_multipath_adjacency_t;
/* IP multicast adjacency. */
typedef struct {
/* Handle for this adjacency in adjacency heap. */
u32 heap_handle;
/* Number of adjecencies in block. */
u32 n_adj;
/* Rewrite string. */
vnet_declare_rewrite (64 - 2*sizeof(u32));
} ip_multicast_rewrite_t;
typedef struct {
/* ip4-multicast-rewrite next index. */
u32 next_index;
u8 n_rewrite_bytes;
u8 rewrite_string[64 - 1*sizeof(u32) - 1*sizeof(u8)];
} ip_multicast_rewrite_string_t;
typedef struct {
ip_multicast_rewrite_t * rewrite_heap;
ip_multicast_rewrite_string_t * rewrite_strings;
/* Negative rewrite string index; >= 0 sw_if_index.
Sorted. Used to hash. */
i32 ** adjacency_id_vector;
uword * adjacency_by_id_vector;
} ip_multicast_lookup_main_t;
typedef struct {
/* Key for mhash; in fact, just a byte offset into mhash key vector. */
u32 address_key;
/* Interface which has this address. */
u32 sw_if_index;
/* Adjacency for neighbor probe (ARP) for this interface address. */
u32 neighbor_probe_adj_index;
/* Address (prefix) length for this interface. */
u16 address_length;
/* Will be used for something eventually. Primary vs. secondary? */
u16 flags;
/* Next and previous pointers for doubly linked list of
addresses per software interface. */
u32 next_this_sw_interface;
u32 prev_this_sw_interface;
} ip_interface_address_t;
typedef enum {
IP_LOCAL_NEXT_DROP,
IP_LOCAL_NEXT_PUNT,
IP_LOCAL_NEXT_UDP_LOOKUP,
IP_LOCAL_NEXT_ICMP,
IP_LOCAL_N_NEXT,
} ip_local_next_t;
struct ip_lookup_main_t;
typedef void (* ip_add_del_adjacency_callback_t) (struct ip_lookup_main_t * lm,
u32 adj_index,
ip_adjacency_t * adj,
u32 is_del);
typedef struct {
vnet_config_main_t config_main;
u32 * config_index_by_sw_if_index;
} ip_config_main_t;
typedef struct ip_lookup_main_t {
/* Adjacency heap. */
ip_adjacency_t * adjacency_heap;
/* Adjacency packet/byte counters indexed by adjacency index. */
vlib_combined_counter_main_t adjacency_counters;
/* Heap of (next hop, weight) blocks. Sorted by next hop. */
ip_multipath_next_hop_t * next_hop_heap;
/* Indexed by heap_handle from ip_adjacency_t. */
ip_multipath_adjacency_t * multipath_adjacencies;
/* Temporary vectors for looking up next hops in hash. */
ip_multipath_next_hop_t * next_hop_hash_lookup_key;
ip_multipath_next_hop_t * next_hop_hash_lookup_key_normalized;
/* Hash table mapping normalized next hops and weights
to multipath adjacency index. */
uword * multipath_adjacency_by_next_hops;
u32 * adjacency_remap_table;
u32 n_adjacency_remaps;
/* If average error per adjacency is less than this threshold adjacency block
size is accepted. */
f64 multipath_next_hop_error_tolerance;
/* Adjacency index for routing table misses, local punts, and drops. */
u32 miss_adj_index, drop_adj_index, local_adj_index;
/* Miss adjacency is always first in adjacency table. */
#define IP_LOOKUP_MISS_ADJ_INDEX 0
ip_add_del_adjacency_callback_t * add_del_adjacency_callbacks;
/* Pool of addresses that are assigned to interfaces. */
ip_interface_address_t * if_address_pool;
/* Hash table mapping address to index in interface address pool. */
mhash_t address_to_if_address_index;
/* Head of doubly linked list of interface addresses for each software interface.
~0 means this interface has no address. */
u32 * if_address_pool_index_by_sw_if_index;
/* First table index to use for this interface, ~0 => none */
u32 * classify_table_index_by_sw_if_index;
/* rx/tx interface/feature configuration. */
ip_config_main_t rx_config_mains[VNET_N_CAST], tx_config_main;
/* Number of bytes in a fib result. Must be at least
sizeof (uword). First word is always adjacency index. */
u32 fib_result_n_bytes, fib_result_n_words;
format_function_t * format_fib_result;
/* 1 for ip6; 0 for ip4. */
u32 is_ip6;
/* Either format_ip4_address_and_length or format_ip6_address_and_length. */
format_function_t * format_address_and_length;
/* Table mapping ip protocol to ip[46]-local node next index. */
u8 local_next_by_ip_protocol[256];
/* IP_BUILTIN_PROTOCOL_{TCP,UDP,ICMP,OTHER} by protocol in IP header. */
u8 builtin_protocol_by_ip_protocol[256];
} ip_lookup_main_t;
always_inline ip_adjacency_t *
ip_get_adjacency (ip_lookup_main_t * lm,
u32 adj_index)
{
ip_adjacency_t * adj;
adj = heap_elt_at_index (lm->adjacency_heap, adj_index);
ASSERT (! heap_is_free_handle (lm->adjacency_heap, adj->heap_handle));
return adj;
}
#define ip_prefetch_adjacency(lm,adj_index,type) \
do { \
ip_adjacency_t * _adj = (lm)->adjacency_heap + (adj_index); \
CLIB_PREFETCH (_adj, sizeof (_adj[0]), type); \
} while (0)
always_inline void
ip_call_add_del_adjacency_callbacks (ip_lookup_main_t * lm, u32 adj_index, u32 is_del)
{
ip_adjacency_t * adj;
uword i;
adj = ip_get_adjacency (lm, adj_index);
for (i = 0; i < vec_len (lm->add_del_adjacency_callbacks); i++)
lm->add_del_adjacency_callbacks[i] (lm, adj_index, adj, is_del);
}
/* Create new block of given number of contiguous adjacencies. */
ip_adjacency_t *
ip_add_adjacency (ip_lookup_main_t * lm,
ip_adjacency_t * adj,
u32 n_adj,
u32 * adj_index_result);
void ip_del_adjacency (ip_lookup_main_t * lm, u32 adj_index);
void
ip_multipath_adjacency_free (ip_lookup_main_t * lm,
ip_multipath_adjacency_t * a);
u32
ip_multipath_adjacency_add_del_next_hop (ip_lookup_main_t * lm,
u32 is_del,
u32 old_mp_adj_index,
u32 next_hop_adj_index,
u32 next_hop_weight,
u32 * new_mp_adj_index);
clib_error_t *
ip_interface_address_add_del (ip_lookup_main_t * lm,
u32 sw_if_index,
void * address,
u32 address_length,
u32 is_del,
u32 * result_index);
always_inline ip_interface_address_t *
ip_get_interface_address (ip_lookup_main_t * lm, void * addr_fib)
{
uword * p = mhash_get (&lm->address_to_if_address_index, addr_fib);
return p ? pool_elt_at_index (lm->if_address_pool, p[0]) : 0;
}
always_inline void *
ip_interface_address_get_address (ip_lookup_main_t * lm, ip_interface_address_t * a)
{ return mhash_key_to_mem (&lm->address_to_if_address_index, a->address_key); }
always_inline ip_interface_address_t *
ip_interface_address_for_packet (ip_lookup_main_t * lm, vlib_buffer_t * b, u32 sw_if_index)
{
ip_adjacency_t * adj;
u32 if_address_index;
adj = ip_get_adjacency (lm, vnet_buffer (b)->ip.adj_index[VLIB_TX]);
ASSERT (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP
|| adj->lookup_next_index == IP_LOOKUP_NEXT_LOCAL);
if_address_index = adj->if_address_index;
if_address_index = (if_address_index == ~0 ?
vec_elt (lm->if_address_pool_index_by_sw_if_index, sw_if_index)
: if_address_index);
return pool_elt_at_index (lm->if_address_pool, if_address_index);
}
#define foreach_ip_interface_address(lm,a,sw_if_index,loop,body) \
do { \
vnet_main_t *_vnm = vnet_get_main(); \
u32 _sw_if_index = sw_if_index; \
vnet_sw_interface_t *_swif; \
_swif = vnet_get_sw_interface (_vnm, _sw_if_index); \
\
/* \
* Loop => honor unnumbered interface addressing. \
*/ \
if (loop && _swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) \
_sw_if_index = _swif->unnumbered_sw_if_index; \
u32 _ia = \
(vec_len((lm)->if_address_pool_index_by_sw_if_index) \
> (_sw_if_index)) \
? vec_elt ((lm)->if_address_pool_index_by_sw_if_index, \
(_sw_if_index)) : (u32)~0; \
ip_interface_address_t * _a; \
while (_ia != ~0) \
{ \
_a = pool_elt_at_index ((lm)->if_address_pool, _ia); \
_ia = _a->next_this_sw_interface; \
(a) = _a; \
body; \
} \
} while (0)
void ip_lookup_init (ip_lookup_main_t * lm, u32 ip_lookup_node_index);
serialize_function_t serialize_ip_lookup_main, unserialize_ip_lookup_main;
serialize_function_t serialize_vec_ip_adjacency, unserialize_vec_ip_adjacency;
#endif /* included_ip_lookup_h */
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