2 * Copyright (c) 2015 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 * ip/ip_lookup.h: ip (4 or 6) lookup structures, adjacencies, ...
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #ifndef included_ip_lookup_h
41 #define included_ip_lookup_h
43 #include <vnet/vnet.h>
44 #include <vlib/buffer.h>
45 #include <vnet/ip/ip4_packet.h>
47 /* Next index stored in adjacency. */
49 /* Packet does not match any route in table. */
52 /* Adjacency says to drop or punt this packet. */
56 /* This packet is for one of our own IP addresses. */
59 /* This packet matches an "interface route" and packets
60 need to be passed to ARP to find rewrite string for
64 /* This packet is to be rewritten and forwarded to the next
65 processing node. This is typically the output interface but
66 might be another node for further output processing. */
67 IP_LOOKUP_NEXT_REWRITE,
69 /* This packet needs to be classified */
70 IP_LOOKUP_NEXT_CLASSIFY,
72 /* This packet needs to go to MAP - RFC7596, RFC7597 */
75 /* This packet needs to go to MAP with Translation - RFC7599 */
78 /* This packets needs to go to 6RD (RFC5969) */
81 /* Hop-by-hop header handling */
82 IP_LOOKUP_NEXT_HOP_BY_HOP,
83 IP_LOOKUP_NEXT_ADD_HOP_BY_HOP,
84 IP_LOOKUP_NEXT_POP_HOP_BY_HOP,
89 /* Flow hash configuration */
90 #define IP_FLOW_HASH_SRC_ADDR (1<<0)
91 #define IP_FLOW_HASH_DST_ADDR (1<<1)
92 #define IP_FLOW_HASH_PROTO (1<<2)
93 #define IP_FLOW_HASH_SRC_PORT (1<<3)
94 #define IP_FLOW_HASH_DST_PORT (1<<4)
95 #define IP_FLOW_HASH_REVERSE_SRC_DST (1<<5)
97 /* Default: 5-tuple without the "reverse" bit */
98 #define IP_FLOW_HASH_DEFAULT (0x1F)
100 #define foreach_flow_hash_bit \
101 _(src, IP_FLOW_HASH_SRC_ADDR) \
102 _(dst, IP_FLOW_HASH_DST_ADDR) \
103 _(sport, IP_FLOW_HASH_SRC_PORT) \
104 _(dport, IP_FLOW_HASH_DST_PORT) \
105 _(proto, IP_FLOW_HASH_PROTO) \
106 _(reverse, IP_FLOW_HASH_REVERSE_SRC_DST)
108 /* IP unicast adjacency. */
110 CLIB_CACHE_LINE_ALIGN_MARK(cacheline0);
111 /* Handle for this adjacency in adjacency heap. */
114 STRUCT_MARK(signature_start);
116 /* Interface address index for this local/arp adjacency. */
117 u32 if_address_index;
119 /* Number of adjecencies in block. Greater than 1 means multipath;
120 otherwise equal to 1. */
123 /* Next hop after ip4-lookup. */
125 ip_lookup_next_t lookup_next_index : 16;
126 u16 lookup_next_index_as_int;
129 /* Force re-lookup in a different FIB. ~0 => normal behavior */
130 i16 explicit_fib_index;
131 u16 mcast_group_index;
133 /* Highest possible perf subgraph arc interposition, e.g. for ip6 ioam */
134 u16 saved_lookup_next_index;
137 /* IP_LOOKUP_NEXT_ARP only */
142 u32 next_adj_index_with_same_next_hop;
144 /* IP_LOOKUP_NEXT_CLASSIFY only */
150 STRUCT_MARK(signature_end);
152 /* Number of FIB entries sharing this adjacency */
154 /* Use this adjacency instead */
155 u32 next_adj_with_signature;
157 CLIB_CACHE_LINE_ALIGN_MARK(cacheline1);
159 /* Rewrite in second/third cache lines */
160 vnet_declare_rewrite (VLIB_BUFFER_PRE_DATA_SIZE);
164 vnet_ip_adjacency_signature (ip_adjacency_t * adj)
166 uword signature = 0xfeedfaceULL;
168 /* Skip heap handle, sum everything up to but not including share_count */
169 signature = hash_memory64
170 (STRUCT_MARK_PTR(adj, signature_start),
171 STRUCT_OFFSET_OF(ip_adjacency_t, signature_end)
172 - STRUCT_OFFSET_OF(ip_adjacency_t, signature_start),
175 /* and the rewrite */
176 signature = hash_memory64 (&adj->rewrite_header, VLIB_BUFFER_PRE_DATA_SIZE,
182 vnet_ip_adjacency_share_compare (ip_adjacency_t * a1, ip_adjacency_t *a2)
184 if (memcmp (STRUCT_MARK_PTR(a1, signature_start),
185 STRUCT_MARK_PTR(a2, signature_start),
186 STRUCT_OFFSET_OF(ip_adjacency_t, signature_end)
187 - STRUCT_OFFSET_OF(ip_adjacency_t, signature_start)))
189 if (memcmp (&a1->rewrite_header, &a2->rewrite_header,
190 VLIB_BUFFER_PRE_DATA_SIZE))
195 /* Index into adjacency table. */
196 typedef u32 ip_adjacency_index_t;
199 /* Directly connected next-hop adjacency index. */
200 u32 next_hop_adj_index;
202 /* Path weight for this adjacency. */
204 } ip_multipath_next_hop_t;
207 /* Adjacency index of first index in block. */
210 /* Power of 2 size of adjacency block. */
213 /* Number of prefixes that point to this adjacency. */
216 /* Normalized next hops are used as hash keys: they are sorted by weight
217 and weights are chosen so they add up to 1 << log2_n_adj_in_block (with
218 zero-weighted next hops being deleted).
219 Unnormalized next hops are saved so that control plane has a record of exactly
220 what the RIB told it. */
222 /* Number of hops in the multipath. */
225 /* Offset into next hop heap for this block. */
228 /* Heap handle used to for example free block when we're done with it. */
230 } normalized_next_hops, unnormalized_next_hops;
231 } ip_multipath_adjacency_t;
233 /* IP multicast adjacency. */
235 /* Handle for this adjacency in adjacency heap. */
238 /* Number of adjecencies in block. */
241 /* Rewrite string. */
242 vnet_declare_rewrite (64 - 2*sizeof(u32));
243 } ip_multicast_rewrite_t;
246 /* ip4-multicast-rewrite next index. */
251 u8 rewrite_string[64 - 1*sizeof(u32) - 1*sizeof(u8)];
252 } ip_multicast_rewrite_string_t;
255 ip_multicast_rewrite_t * rewrite_heap;
257 ip_multicast_rewrite_string_t * rewrite_strings;
259 /* Negative rewrite string index; >= 0 sw_if_index.
260 Sorted. Used to hash. */
261 i32 ** adjacency_id_vector;
263 uword * adjacency_by_id_vector;
264 } ip_multicast_lookup_main_t;
267 /* Key for mhash; in fact, just a byte offset into mhash key vector. */
270 /* Interface which has this address. */
273 /* Adjacency for neighbor probe (ARP) for this interface address. */
274 u32 neighbor_probe_adj_index;
276 /* Address (prefix) length for this interface. */
279 /* Will be used for something eventually. Primary vs. secondary? */
282 /* Next and previous pointers for doubly linked list of
283 addresses per software interface. */
284 u32 next_this_sw_interface;
285 u32 prev_this_sw_interface;
286 } ip_interface_address_t;
291 IP_LOCAL_NEXT_UDP_LOOKUP,
296 struct ip_lookup_main_t;
298 typedef void (* ip_add_del_adjacency_callback_t) (struct ip_lookup_main_t * lm,
300 ip_adjacency_t * adj,
304 vnet_config_main_t config_main;
306 u32 * config_index_by_sw_if_index;
309 typedef struct ip_lookup_main_t {
310 /* Adjacency heap. */
311 ip_adjacency_t * adjacency_heap;
313 /* Adjacency packet/byte counters indexed by adjacency index. */
314 vlib_combined_counter_main_t adjacency_counters;
316 /* Heap of (next hop, weight) blocks. Sorted by next hop. */
317 ip_multipath_next_hop_t * next_hop_heap;
319 /* Indexed by heap_handle from ip_adjacency_t. */
320 ip_multipath_adjacency_t * multipath_adjacencies;
322 /* Adjacency by signature hash */
323 uword * adj_index_by_signature;
325 /* Temporary vectors for looking up next hops in hash. */
326 ip_multipath_next_hop_t * next_hop_hash_lookup_key;
327 ip_multipath_next_hop_t * next_hop_hash_lookup_key_normalized;
329 /* Hash table mapping normalized next hops and weights
330 to multipath adjacency index. */
331 uword * multipath_adjacency_by_next_hops;
333 u32 * adjacency_remap_table;
334 u32 n_adjacency_remaps;
336 /* If average error per adjacency is less than this threshold adjacency block
338 f64 multipath_next_hop_error_tolerance;
340 /* Adjacency index for routing table misses, local punts, and drops. */
341 u32 miss_adj_index, drop_adj_index, local_adj_index;
343 /* Miss adjacency is always first in adjacency table. */
344 #define IP_LOOKUP_MISS_ADJ_INDEX 0
346 ip_add_del_adjacency_callback_t * add_del_adjacency_callbacks;
348 /* Pool of addresses that are assigned to interfaces. */
349 ip_interface_address_t * if_address_pool;
351 /* Hash table mapping address to index in interface address pool. */
352 mhash_t address_to_if_address_index;
354 /* Head of doubly linked list of interface addresses for each software interface.
355 ~0 means this interface has no address. */
356 u32 * if_address_pool_index_by_sw_if_index;
358 /* First table index to use for this interface, ~0 => none */
359 u32 * classify_table_index_by_sw_if_index;
361 /* rx/tx interface/feature configuration. */
362 ip_config_main_t rx_config_mains[VNET_N_CAST], tx_config_main;
364 /* Number of bytes in a fib result. Must be at least
365 sizeof (uword). First word is always adjacency index. */
366 u32 fib_result_n_bytes, fib_result_n_words;
368 format_function_t * format_fib_result;
370 /* 1 for ip6; 0 for ip4. */
373 /* Either format_ip4_address_and_length or format_ip6_address_and_length. */
374 format_function_t * format_address_and_length;
376 /* Table mapping ip protocol to ip[46]-local node next index. */
377 u8 local_next_by_ip_protocol[256];
379 /* IP_BUILTIN_PROTOCOL_{TCP,UDP,ICMP,OTHER} by protocol in IP header. */
380 u8 builtin_protocol_by_ip_protocol[256];
383 always_inline ip_adjacency_t *
384 ip_get_adjacency (ip_lookup_main_t * lm,
387 ip_adjacency_t * adj;
389 adj = vec_elt_at_index (lm->adjacency_heap, adj_index);
391 ASSERT (adj->heap_handle != ~0);
396 #define ip_prefetch_adjacency(lm,adj_index,type) \
398 ip_adjacency_t * _adj = (lm)->adjacency_heap + (adj_index); \
399 CLIB_PREFETCH (_adj, sizeof (_adj[0]), type); \
403 ip_register_add_del_adjacency_callback(ip_lookup_main_t * lm,
404 ip_add_del_adjacency_callback_t cb)
406 vec_add1(lm->add_del_adjacency_callbacks, cb);
410 ip_call_add_del_adjacency_callbacks (ip_lookup_main_t * lm, u32 adj_index, u32 is_del)
412 ip_adjacency_t * adj;
414 adj = ip_get_adjacency (lm, adj_index);
415 for (i = 0; i < vec_len (lm->add_del_adjacency_callbacks); i++)
416 lm->add_del_adjacency_callbacks[i] (lm, adj_index, adj, is_del);
419 /* Create new block of given number of contiguous adjacencies. */
421 ip_add_adjacency (ip_lookup_main_t * lm,
422 ip_adjacency_t * adj,
424 u32 * adj_index_result);
426 void ip_del_adjacency (ip_lookup_main_t * lm, u32 adj_index);
428 ip_update_adjacency (ip_lookup_main_t * lm,
430 ip_adjacency_t * copy_adj);
433 ip_adjacency_is_multipath(ip_lookup_main_t * lm, u32 adj_index)
435 if (vec_len(lm->multipath_adjacencies) < adj_index - 1)
438 return (lm->multipath_adjacencies[adj_index].adj_index == adj_index &&
439 lm->multipath_adjacencies[adj_index].n_adj_in_block > 0);
443 ip_multipath_adjacency_free (ip_lookup_main_t * lm,
444 ip_multipath_adjacency_t * a);
447 ip_multipath_adjacency_add_del_next_hop (ip_lookup_main_t * lm,
449 u32 old_mp_adj_index,
450 u32 next_hop_adj_index,
452 u32 * new_mp_adj_index);
455 ip_interface_address_add_del (ip_lookup_main_t * lm,
462 always_inline ip_interface_address_t *
463 ip_get_interface_address (ip_lookup_main_t * lm, void * addr_fib)
465 uword * p = mhash_get (&lm->address_to_if_address_index, addr_fib);
466 return p ? pool_elt_at_index (lm->if_address_pool, p[0]) : 0;
470 ip_interface_address_get_address (ip_lookup_main_t * lm, ip_interface_address_t * a)
471 { return mhash_key_to_mem (&lm->address_to_if_address_index, a->address_key); }
473 always_inline ip_interface_address_t *
474 ip_interface_address_for_packet (ip_lookup_main_t * lm, vlib_buffer_t * b, u32 sw_if_index)
476 ip_adjacency_t * adj;
477 u32 if_address_index;
479 adj = ip_get_adjacency (lm, vnet_buffer (b)->ip.adj_index[VLIB_TX]);
481 ASSERT (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP
482 || adj->lookup_next_index == IP_LOOKUP_NEXT_LOCAL);
483 if_address_index = adj->if_address_index;
484 if_address_index = (if_address_index == ~0 ?
485 vec_elt (lm->if_address_pool_index_by_sw_if_index, sw_if_index)
488 return pool_elt_at_index (lm->if_address_pool, if_address_index);
491 #define foreach_ip_interface_address(lm,a,sw_if_index,loop,body) \
493 vnet_main_t *_vnm = vnet_get_main(); \
494 u32 _sw_if_index = sw_if_index; \
495 vnet_sw_interface_t *_swif; \
496 _swif = vnet_get_sw_interface (_vnm, _sw_if_index); \
499 * Loop => honor unnumbered interface addressing. \
501 if (loop && _swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) \
502 _sw_if_index = _swif->unnumbered_sw_if_index; \
504 (vec_len((lm)->if_address_pool_index_by_sw_if_index) \
506 ? vec_elt ((lm)->if_address_pool_index_by_sw_if_index, \
507 (_sw_if_index)) : (u32)~0; \
508 ip_interface_address_t * _a; \
511 _a = pool_elt_at_index ((lm)->if_address_pool, _ia); \
512 _ia = _a->next_this_sw_interface; \
518 void ip_lookup_init (ip_lookup_main_t * lm, u32 ip_lookup_node_index);
520 #endif /* included_ip_lookup_h */