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.
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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
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33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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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 #define IP4_LOOKUP_NEXT_NODES { \
90 [IP_LOOKUP_NEXT_MISS] = "ip4-miss", \
91 [IP_LOOKUP_NEXT_DROP] = "ip4-drop", \
92 [IP_LOOKUP_NEXT_PUNT] = "ip4-punt", \
93 [IP_LOOKUP_NEXT_LOCAL] = "ip4-local", \
94 [IP_LOOKUP_NEXT_ARP] = "ip4-arp", \
95 [IP_LOOKUP_NEXT_REWRITE] = "ip4-rewrite-transit", \
96 [IP_LOOKUP_NEXT_CLASSIFY] = "ip4-classify", \
97 [IP_LOOKUP_NEXT_MAP] = "ip4-map", \
98 [IP_LOOKUP_NEXT_MAP_T] = "ip4-map-t", \
99 [IP_LOOKUP_NEXT_SIXRD] = "ip4-sixrd", \
100 [IP_LOOKUP_NEXT_HOP_BY_HOP] = "ip4-hop-by-hop", \
101 [IP_LOOKUP_NEXT_ADD_HOP_BY_HOP] = "ip4-add-hop-by-hop", \
102 [IP_LOOKUP_NEXT_POP_HOP_BY_HOP] = "ip4-pop-hop-by-hop", \
105 #define IP6_LOOKUP_NEXT_NODES { \
106 [IP_LOOKUP_NEXT_MISS] = "ip6-miss", \
107 [IP_LOOKUP_NEXT_DROP] = "ip6-drop", \
108 [IP_LOOKUP_NEXT_PUNT] = "ip6-punt", \
109 [IP_LOOKUP_NEXT_LOCAL] = "ip6-local", \
110 [IP_LOOKUP_NEXT_ARP] = "ip6-discover-neighbor", \
111 [IP_LOOKUP_NEXT_REWRITE] = "ip6-rewrite", \
112 [IP_LOOKUP_NEXT_CLASSIFY] = "ip6-classify", \
113 [IP_LOOKUP_NEXT_MAP] = "ip6-map", \
114 [IP_LOOKUP_NEXT_MAP_T] = "ip6-map-t", \
115 [IP_LOOKUP_NEXT_SIXRD] = "ip6-sixrd", \
116 [IP_LOOKUP_NEXT_HOP_BY_HOP] = "ip6-hop-by-hop", \
117 [IP_LOOKUP_NEXT_ADD_HOP_BY_HOP] = "ip6-add-hop-by-hop", \
118 [IP_LOOKUP_NEXT_POP_HOP_BY_HOP] = "ip6-pop-hop-by-hop", \
121 /* Flow hash configuration */
122 #define IP_FLOW_HASH_SRC_ADDR (1<<0)
123 #define IP_FLOW_HASH_DST_ADDR (1<<1)
124 #define IP_FLOW_HASH_PROTO (1<<2)
125 #define IP_FLOW_HASH_SRC_PORT (1<<3)
126 #define IP_FLOW_HASH_DST_PORT (1<<4)
127 #define IP_FLOW_HASH_REVERSE_SRC_DST (1<<5)
129 /* Default: 5-tuple without the "reverse" bit */
130 #define IP_FLOW_HASH_DEFAULT (0x1F)
132 #define foreach_flow_hash_bit \
133 _(src, IP_FLOW_HASH_SRC_ADDR) \
134 _(dst, IP_FLOW_HASH_DST_ADDR) \
135 _(sport, IP_FLOW_HASH_SRC_PORT) \
136 _(dport, IP_FLOW_HASH_DST_PORT) \
137 _(proto, IP_FLOW_HASH_PROTO) \
138 _(reverse, IP_FLOW_HASH_REVERSE_SRC_DST)
140 /* IP unicast adjacency. */
142 CLIB_CACHE_LINE_ALIGN_MARK(cacheline0);
143 /* Handle for this adjacency in adjacency heap. */
146 STRUCT_MARK(signature_start);
148 /* Interface address index for this local/arp adjacency. */
149 u32 if_address_index;
151 /* Number of adjecencies in block. Greater than 1 means multipath;
152 otherwise equal to 1. */
155 /* Next hop after ip4-lookup. */
157 ip_lookup_next_t lookup_next_index : 16;
158 u16 lookup_next_index_as_int;
161 /* Force re-lookup in a different FIB. ~0 => normal behavior */
162 i16 explicit_fib_index;
163 u16 mcast_group_index;
165 /* Highest possible perf subgraph arc interposition, e.g. for ip6 ioam */
166 u16 saved_lookup_next_index;
169 /* IP_LOOKUP_NEXT_ARP only */
174 u32 next_adj_index_with_same_next_hop;
176 /* IP_LOOKUP_NEXT_CLASSIFY only */
182 STRUCT_MARK(signature_end);
184 /* Number of FIB entries sharing this adjacency */
186 /* Use this adjacency instead */
187 u32 next_adj_with_signature;
189 CLIB_CACHE_LINE_ALIGN_MARK(cacheline1);
191 /* Rewrite in second/third cache lines */
192 vnet_declare_rewrite (VLIB_BUFFER_PRE_DATA_SIZE);
196 vnet_ip_adjacency_signature (ip_adjacency_t * adj)
198 uword signature = 0xfeedfaceULL;
200 /* Skip heap handle, sum everything up to but not including share_count */
201 signature = hash_memory64
202 (STRUCT_MARK_PTR(adj, signature_start),
203 STRUCT_OFFSET_OF(ip_adjacency_t, signature_end)
204 - STRUCT_OFFSET_OF(ip_adjacency_t, signature_start),
207 /* and the rewrite */
208 signature = hash_memory64 (&adj->rewrite_header, VLIB_BUFFER_PRE_DATA_SIZE,
214 vnet_ip_adjacency_share_compare (ip_adjacency_t * a1, ip_adjacency_t *a2)
216 if (memcmp (STRUCT_MARK_PTR(a1, signature_start),
217 STRUCT_MARK_PTR(a2, signature_start),
218 STRUCT_OFFSET_OF(ip_adjacency_t, signature_end)
219 - STRUCT_OFFSET_OF(ip_adjacency_t, signature_start)))
221 if (memcmp (&a1->rewrite_header, &a2->rewrite_header,
222 VLIB_BUFFER_PRE_DATA_SIZE))
227 /* Index into adjacency table. */
228 typedef u32 ip_adjacency_index_t;
231 /* Directly connected next-hop adjacency index. */
232 u32 next_hop_adj_index;
234 /* Path weight for this adjacency. */
236 } ip_multipath_next_hop_t;
239 /* Adjacency index of first index in block. */
242 /* Power of 2 size of adjacency block. */
245 /* Number of prefixes that point to this adjacency. */
248 /* Normalized next hops are used as hash keys: they are sorted by weight
249 and weights are chosen so they add up to 1 << log2_n_adj_in_block (with
250 zero-weighted next hops being deleted).
251 Unnormalized next hops are saved so that control plane has a record of exactly
252 what the RIB told it. */
254 /* Number of hops in the multipath. */
257 /* Offset into next hop heap for this block. */
260 /* Heap handle used to for example free block when we're done with it. */
262 } normalized_next_hops, unnormalized_next_hops;
263 } ip_multipath_adjacency_t;
265 /* IP multicast adjacency. */
267 /* Handle for this adjacency in adjacency heap. */
270 /* Number of adjecencies in block. */
273 /* Rewrite string. */
274 vnet_declare_rewrite (64 - 2*sizeof(u32));
275 } ip_multicast_rewrite_t;
278 /* ip4-multicast-rewrite next index. */
283 u8 rewrite_string[64 - 1*sizeof(u32) - 1*sizeof(u8)];
284 } ip_multicast_rewrite_string_t;
287 ip_multicast_rewrite_t * rewrite_heap;
289 ip_multicast_rewrite_string_t * rewrite_strings;
291 /* Negative rewrite string index; >= 0 sw_if_index.
292 Sorted. Used to hash. */
293 i32 ** adjacency_id_vector;
295 uword * adjacency_by_id_vector;
296 } ip_multicast_lookup_main_t;
299 /* Key for mhash; in fact, just a byte offset into mhash key vector. */
302 /* Interface which has this address. */
305 /* Adjacency for neighbor probe (ARP) for this interface address. */
306 u32 neighbor_probe_adj_index;
308 /* Address (prefix) length for this interface. */
311 /* Will be used for something eventually. Primary vs. secondary? */
314 /* Next and previous pointers for doubly linked list of
315 addresses per software interface. */
316 u32 next_this_sw_interface;
317 u32 prev_this_sw_interface;
318 } ip_interface_address_t;
323 IP_LOCAL_NEXT_UDP_LOOKUP,
328 struct ip_lookup_main_t;
330 typedef void (* ip_add_del_adjacency_callback_t) (struct ip_lookup_main_t * lm,
332 ip_adjacency_t * adj,
336 vnet_config_main_t config_main;
338 u32 * config_index_by_sw_if_index;
341 typedef struct ip_lookup_main_t {
342 /* Adjacency heap. */
343 ip_adjacency_t * adjacency_heap;
345 /* Adjacency packet/byte counters indexed by adjacency index. */
346 vlib_combined_counter_main_t adjacency_counters;
348 /* Heap of (next hop, weight) blocks. Sorted by next hop. */
349 ip_multipath_next_hop_t * next_hop_heap;
351 /* Indexed by heap_handle from ip_adjacency_t. */
352 ip_multipath_adjacency_t * multipath_adjacencies;
354 /* Adjacency by signature hash */
355 uword * adj_index_by_signature;
357 /* Temporary vectors for looking up next hops in hash. */
358 ip_multipath_next_hop_t * next_hop_hash_lookup_key;
359 ip_multipath_next_hop_t * next_hop_hash_lookup_key_normalized;
361 /* Hash table mapping normalized next hops and weights
362 to multipath adjacency index. */
363 uword * multipath_adjacency_by_next_hops;
365 u32 * adjacency_remap_table;
366 u32 n_adjacency_remaps;
368 /* If average error per adjacency is less than this threshold adjacency block
370 f64 multipath_next_hop_error_tolerance;
372 /* Adjacency index for routing table misses, local punts, and drops. */
373 u32 miss_adj_index, drop_adj_index, local_adj_index;
375 /* Miss adjacency is always first in adjacency table. */
376 #define IP_LOOKUP_MISS_ADJ_INDEX 0
378 ip_add_del_adjacency_callback_t * add_del_adjacency_callbacks;
380 /* Pool of addresses that are assigned to interfaces. */
381 ip_interface_address_t * if_address_pool;
383 /* Hash table mapping address to index in interface address pool. */
384 mhash_t address_to_if_address_index;
386 /* Head of doubly linked list of interface addresses for each software interface.
387 ~0 means this interface has no address. */
388 u32 * if_address_pool_index_by_sw_if_index;
390 /* First table index to use for this interface, ~0 => none */
391 u32 * classify_table_index_by_sw_if_index;
393 /* rx/tx interface/feature configuration. */
394 ip_config_main_t rx_config_mains[VNET_N_CAST], tx_config_main;
396 /* Number of bytes in a fib result. Must be at least
397 sizeof (uword). First word is always adjacency index. */
398 u32 fib_result_n_bytes, fib_result_n_words;
400 format_function_t * format_fib_result;
402 /* 1 for ip6; 0 for ip4. */
405 /* Either format_ip4_address_and_length or format_ip6_address_and_length. */
406 format_function_t * format_address_and_length;
408 /* Table mapping ip protocol to ip[46]-local node next index. */
409 u8 local_next_by_ip_protocol[256];
411 /* IP_BUILTIN_PROTOCOL_{TCP,UDP,ICMP,OTHER} by protocol in IP header. */
412 u8 builtin_protocol_by_ip_protocol[256];
415 always_inline ip_adjacency_t *
416 ip_get_adjacency (ip_lookup_main_t * lm,
419 ip_adjacency_t * adj;
421 adj = vec_elt_at_index (lm->adjacency_heap, adj_index);
423 ASSERT (adj->heap_handle != ~0);
428 #define ip_prefetch_adjacency(lm,adj_index,type) \
430 ip_adjacency_t * _adj = (lm)->adjacency_heap + (adj_index); \
431 CLIB_PREFETCH (_adj, sizeof (_adj[0]), type); \
435 ip_register_add_del_adjacency_callback(ip_lookup_main_t * lm,
436 ip_add_del_adjacency_callback_t cb)
438 vec_add1(lm->add_del_adjacency_callbacks, cb);
442 ip_call_add_del_adjacency_callbacks (ip_lookup_main_t * lm, u32 adj_index, u32 is_del)
444 ip_adjacency_t * adj;
446 adj = ip_get_adjacency (lm, adj_index);
447 for (i = 0; i < vec_len (lm->add_del_adjacency_callbacks); i++)
448 lm->add_del_adjacency_callbacks[i] (lm, adj_index, adj, is_del);
451 /* Create new block of given number of contiguous adjacencies. */
453 ip_add_adjacency (ip_lookup_main_t * lm,
454 ip_adjacency_t * adj,
456 u32 * adj_index_result);
458 void ip_del_adjacency (ip_lookup_main_t * lm, u32 adj_index);
460 ip_update_adjacency (ip_lookup_main_t * lm,
462 ip_adjacency_t * copy_adj);
465 ip_adjacency_is_multipath(ip_lookup_main_t * lm, u32 adj_index)
467 if (vec_len(lm->multipath_adjacencies) < adj_index - 1)
470 return (lm->multipath_adjacencies[adj_index].adj_index == adj_index &&
471 lm->multipath_adjacencies[adj_index].n_adj_in_block > 0);
475 ip_multipath_adjacency_free (ip_lookup_main_t * lm,
476 ip_multipath_adjacency_t * a);
479 ip_multipath_adjacency_add_del_next_hop (ip_lookup_main_t * lm,
481 u32 old_mp_adj_index,
482 u32 next_hop_adj_index,
484 u32 * new_mp_adj_index);
487 ip_interface_address_add_del (ip_lookup_main_t * lm,
494 always_inline ip_interface_address_t *
495 ip_get_interface_address (ip_lookup_main_t * lm, void * addr_fib)
497 uword * p = mhash_get (&lm->address_to_if_address_index, addr_fib);
498 return p ? pool_elt_at_index (lm->if_address_pool, p[0]) : 0;
502 ip_interface_address_get_address (ip_lookup_main_t * lm, ip_interface_address_t * a)
503 { return mhash_key_to_mem (&lm->address_to_if_address_index, a->address_key); }
505 always_inline ip_interface_address_t *
506 ip_interface_address_for_packet (ip_lookup_main_t * lm, vlib_buffer_t * b, u32 sw_if_index)
508 ip_adjacency_t * adj;
509 u32 if_address_index;
511 adj = ip_get_adjacency (lm, vnet_buffer (b)->ip.adj_index[VLIB_TX]);
513 ASSERT (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP
514 || adj->lookup_next_index == IP_LOOKUP_NEXT_LOCAL);
515 if_address_index = adj->if_address_index;
516 if_address_index = (if_address_index == ~0 ?
517 vec_elt (lm->if_address_pool_index_by_sw_if_index, sw_if_index)
520 return pool_elt_at_index (lm->if_address_pool, if_address_index);
523 #define foreach_ip_interface_address(lm,a,sw_if_index,loop,body) \
525 vnet_main_t *_vnm = vnet_get_main(); \
526 u32 _sw_if_index = sw_if_index; \
527 vnet_sw_interface_t *_swif; \
528 _swif = vnet_get_sw_interface (_vnm, _sw_if_index); \
531 * Loop => honor unnumbered interface addressing. \
533 if (loop && _swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) \
534 _sw_if_index = _swif->unnumbered_sw_if_index; \
536 (vec_len((lm)->if_address_pool_index_by_sw_if_index) \
538 ? vec_elt ((lm)->if_address_pool_index_by_sw_if_index, \
539 (_sw_if_index)) : (u32)~0; \
540 ip_interface_address_t * _a; \
543 _a = pool_elt_at_index ((lm)->if_address_pool, _ia); \
544 _ia = _a->next_this_sw_interface; \
550 void ip_lookup_init (ip_lookup_main_t * lm, u32 ip_lookup_node_index);
552 #endif /* included_ip_lookup_h */