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
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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/ip4.h: ip4 main include file
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_ip4_h
41 #define included_ip_ip4_h
43 #include <vnet/ip/ip4_mtrie.h>
44 #include <vnet/ip/ip4_packet.h>
45 #include <vnet/ip/lookup.h>
46 #include <vnet/ip/ip_feature_registration.h>
48 typedef struct ip4_fib_t {
49 /* Hash table for each prefix length mapping. */
50 uword * adj_index_by_dst_address[33];
52 /* Temporary vectors for holding new/old values for hash_set. */
53 uword * new_hash_values, * old_hash_values;
55 /* Mtrie for fast lookups. Hash is used to maintain overlapping prefixes. */
56 ip4_fib_mtrie_t mtrie;
58 /* Table ID (hash key) for this FIB. */
61 /* Index into FIB vector. */
64 /* flow hash configuration */
67 /* N-tuple classifier indices */
68 u32 fwd_classify_table_index;
69 u32 rev_classify_table_index;
75 typedef void (ip4_add_del_route_function_t)
76 (struct ip4_main_t * im,
80 ip4_address_t * address,
86 ip4_add_del_route_function_t * function;
88 uword function_opaque;
89 } ip4_add_del_route_callback_t;
91 typedef void (ip4_add_del_interface_address_function_t)
92 (struct ip4_main_t * im,
95 ip4_address_t * address,
101 ip4_add_del_interface_address_function_t * function;
102 uword function_opaque;
103 } ip4_add_del_interface_address_callback_t;
106 * @brief IPv4 main type.
108 * State of IPv4 VPP processing including:
110 * - Feature indices used in feature topological sort
111 * - Feature node run time references
114 typedef struct ip4_main_t {
115 ip_lookup_main_t lookup_main;
117 /** Vector of FIBs. */
122 /** Table index indexed by software interface. */
123 u32 * fib_index_by_sw_if_index;
125 /** Hash table mapping table id to fib index.
126 ID space is not necessarily dense; index space is dense. */
127 uword * fib_index_by_table_id;
129 /** Vector of functions to call when routes are added/deleted. */
130 ip4_add_del_route_callback_t * add_del_route_callbacks;
132 /** Hash table mapping interface route rewrite adjacency index by sw if index. */
133 uword * interface_route_adj_index_by_sw_if_index;
135 /** Functions to call when interface address changes. */
136 ip4_add_del_interface_address_callback_t * add_del_interface_address_callbacks;
138 /** Template used to generate IP4 ARP packets. */
139 vlib_packet_template_t ip4_arp_request_packet_template;
141 /** Feature path configuration lists */
142 vnet_ip_feature_registration_t * next_uc_feature;
143 vnet_ip_feature_registration_t * next_mc_feature;
145 /** Built-in unicast feature path indice, see @ref ip_feature_init_cast() */
146 u32 ip4_unicast_rx_feature_check_access;
147 /** Built-in unicast feature path indice, see @ref ip_feature_init_cast() */
148 u32 ip4_unicast_rx_feature_source_reachable_via_rx;
149 /** Built-in unicast feature path indice, see @ref ip_feature_init_cast() */
150 u32 ip4_unicast_rx_feature_source_reachable_via_any;
151 /** Built-in unicast feature path indice, see @ref ip_feature_init_cast() */
152 u32 ip4_unicast_rx_feature_policer_classify;
153 /** Built-in unicast feature path indice, see @ref ip_feature_init_cast() */
154 u32 ip4_unicast_rx_feature_ipsec;
155 /** Built-in unicast feature path indice, see @ref ip_feature_init_cast() */
156 u32 ip4_unicast_rx_feature_vpath;
157 /** Built-in unicast feature path indice, see @ref ip_feature_init_cast() */
158 u32 ip4_unicast_rx_feature_lookup;
159 /** Built-in unicast feature path indice, see @ref ip_feature_init_cast() */
160 u32 ip4_unicast_rx_feature_source_and_port_range_check;
162 /** Built-in multicast feature path indices */
163 u32 ip4_multicast_rx_feature_vpath;
164 /** Built-in multicast feature path indices */
165 u32 ip4_multicast_rx_feature_lookup;
167 /** Save results for show command */
168 char ** feature_nodes[VNET_N_CAST];
170 /** Seed for Jenkins hash used to compute ip4 flow hash. */
173 /** @brief Template information for VPP generated packets */
175 /** TTL to use for host generated packets. */
178 /** TOS byte to use for host generated packets. */
185 /** Global ip4 main structure. */
186 extern ip4_main_t ip4_main;
188 #define VNET_IP4_UNICAST_FEATURE_INIT(x,...) \
189 __VA_ARGS__ vnet_ip_feature_registration_t uc_##x; \
190 static void __vnet_add_feature_registration_uc_##x (void) \
191 __attribute__((__constructor__)) ; \
192 static void __vnet_add_feature_registration_uc_##x (void) \
194 ip4_main_t * im = &ip4_main; \
195 uc_##x.next = im->next_uc_feature; \
196 im->next_uc_feature = &uc_##x; \
198 __VA_ARGS__ vnet_ip_feature_registration_t uc_##x
200 #define VNET_IP4_MULTICAST_FEATURE_INIT(x,...) \
201 __VA_ARGS__ vnet_ip_feature_registration_t mc_##x; \
202 static void __vnet_add_feature_registration_mc_##x (void) \
203 __attribute__((__constructor__)) ; \
204 static void __vnet_add_feature_registration_mc_##x (void) \
206 ip4_main_t * im = &ip4_main; \
207 mc_##x.next = im->next_mc_feature; \
208 im->next_mc_feature = &mc_##x; \
210 __VA_ARGS__ vnet_ip_feature_registration_t mc_##x
213 /* Global ip4 input node. Errors get attached to ip4 input node. */
214 extern vlib_node_registration_t ip4_input_node;
215 extern vlib_node_registration_t ip4_lookup_node;
216 extern vlib_node_registration_t ip4_rewrite_node;
217 extern vlib_node_registration_t ip4_rewrite_local_node;
218 extern vlib_node_registration_t ip4_arp_node;
220 u32 ip4_fib_lookup_with_table (ip4_main_t * im, u32 fib_index, ip4_address_t * dst,
221 u32 disable_default_route);
224 ip4_fib_lookup_buffer (ip4_main_t * im, u32 fib_index, ip4_address_t * dst,
227 return ip4_fib_lookup_with_table (im, fib_index, dst,
228 /* disable_default_route */ 0);
232 ip4_fib_lookup (ip4_main_t * im, u32 sw_if_index, ip4_address_t * dst)
234 u32 fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
235 return ip4_fib_lookup_with_table (im, fib_index, dst,
236 /* disable_default_route */ 0);
240 ip4_destination_matches_route (ip4_main_t * im,
242 ip4_address_t * dest,
244 { return 0 == ((key->data_u32 ^ dest->data_u32) & im->fib_masks[dest_length]); }
247 ip4_destination_matches_interface (ip4_main_t * im,
249 ip_interface_address_t * ia)
251 ip4_address_t * a = ip_interface_address_get_address (&im->lookup_main, ia);
252 return ip4_destination_matches_route (im, key, a, ia->address_length);
255 /* As above but allows for unaligned destinations (e.g. works right from IP header of packet). */
257 ip4_unaligned_destination_matches_route (ip4_main_t * im,
259 ip4_address_t * dest,
261 { return 0 == ((clib_mem_unaligned (&key->data_u32, u32) ^ dest->data_u32) & im->fib_masks[dest_length]); }
264 ip4_src_address_for_packet (ip4_main_t * im, vlib_buffer_t * p, ip4_address_t * src, u32 sw_if_index)
266 ip_lookup_main_t * lm = &im->lookup_main;
267 ip_interface_address_t * ia = ip_interface_address_for_packet (lm, p, sw_if_index);
270 ip4_address_t * a = ip_interface_address_get_address (lm, ia);
275 /* Find interface address which matches destination. */
276 always_inline ip4_address_t *
277 ip4_interface_address_matching_destination (ip4_main_t * im, ip4_address_t * dst, u32 sw_if_index,
278 ip_interface_address_t ** result_ia)
280 ip_lookup_main_t * lm = &im->lookup_main;
281 ip_interface_address_t * ia;
282 ip4_address_t * result = 0;
284 foreach_ip_interface_address (lm, ia, sw_if_index,
285 1 /* honor unnumbered */,
287 ip4_address_t * a = ip_interface_address_get_address (lm, ia);
288 if (ip4_destination_matches_route (im, dst, a, ia->address_length))
295 *result_ia = result ? ia : 0;
300 ip4_add_del_interface_address (vlib_main_t * vm, u32 sw_if_index,
301 ip4_address_t * address, u32 address_length,
304 int ip4_address_compare (ip4_address_t * a1, ip4_address_t * a2);
306 /* Add/del a route to the FIB. */
308 #define IP4_ROUTE_FLAG_ADD (0 << 0)
309 #define IP4_ROUTE_FLAG_DEL (1 << 0)
310 #define IP4_ROUTE_FLAG_TABLE_ID (0 << 1)
311 #define IP4_ROUTE_FLAG_FIB_INDEX (1 << 1)
312 #define IP4_ROUTE_FLAG_KEEP_OLD_ADJACENCY (1 << 2)
313 #define IP4_ROUTE_FLAG_NO_REDISTRIBUTE (1 << 3)
314 /* Not last add/del in group. Facilities batching requests into packets. */
315 #define IP4_ROUTE_FLAG_NOT_LAST_IN_GROUP (1 << 4)
316 /* Dynamic route created via ARP reply. */
317 #define IP4_ROUTE_FLAG_NEIGHBOR (1 << 5)
320 /* IP4_ROUTE_FLAG_* */
323 /* Either index of fib or table_id to hash and get fib.
324 IP4_ROUTE_FLAG_FIB_INDEX specifies index; otherwise table_id is assumed. */
325 u32 table_index_or_table_id;
327 /* Destination address (prefix) and length. */
328 ip4_address_t dst_address;
329 u32 dst_address_length;
331 /* Adjacency to use for this destination. */
334 /* If specified adjacencies to add and then
335 use for this destination. add_adj/n_add_adj
336 are override adj_index if specified. */
337 ip_adjacency_t * add_adj;
339 } ip4_add_del_route_args_t;
342 * \brief Get or create an IPv4 fib.
344 * Get or create an IPv4 fib with the provided fib ID or index.
345 * The fib ID is a possibly-sparse user-defined value while
346 * the fib index defines the position of the fib in the fib vector.
350 * \param table_index_or_id
351 * The table index if \c IP4_ROUTE_FLAG_FIB_INDEX bit is set in \p flags.
352 * Otherwise, when set to \c ~0, an arbitrary and unused fib ID is picked
353 * and can be retrieved with \c ret->table_id.
354 * Otherwise, the fib ID to be used to retrieve or create the desired fib.
356 * Indicates whether \p table_index_or_id is the fib index or ID.
357 * When the bit \c IP4_ROUTE_FLAG_FIB_INDEX is set, \p table_index_or_id
358 * is considered as the fib index, and the fib ID otherwise.
359 * \returns A pointer to the retrieved or created fib.
361 * \remark When getting a fib with the fib index, the fib MUST already exist.
364 find_ip4_fib_by_table_index_or_id (ip4_main_t * im,
365 u32 table_index_or_id, u32 flags);
367 void ip4_add_del_route (ip4_main_t * im, ip4_add_del_route_args_t * args);
369 void ip4_add_del_route_next_hop (ip4_main_t * im,
371 ip4_address_t * dst_address,
372 u32 dst_address_length,
373 ip4_address_t * next_hop,
374 u32 next_hop_sw_if_index,
375 u32 next_hop_weight, u32 adj_index,
376 u32 explicit_fib_index);
379 ip4_route_get_next_hop_adj (ip4_main_t * im,
381 ip4_address_t *next_hop,
382 u32 next_hop_sw_if_index,
383 u32 explicit_fib_index);
386 ip4_get_route (ip4_main_t * im,
387 u32 fib_index_or_table_id,
393 ip4_foreach_matching_route (ip4_main_t * im,
394 u32 table_index_or_table_id,
396 ip4_address_t * address,
398 ip4_address_t ** results,
399 u8 ** result_lengths);
401 void ip4_delete_matching_routes (ip4_main_t * im,
402 u32 table_index_or_table_id,
404 ip4_address_t * address,
407 void ip4_maybe_remap_adjacencies (ip4_main_t * im,
408 u32 table_index_or_table_id,
411 void ip4_adjacency_set_interface_route (vnet_main_t * vnm,
412 ip_adjacency_t * adj,
414 u32 if_address_index);
417 ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
418 ip_interface_address_t ** result_ia);
420 /* Send an ARP request to see if given destination is reachable on given interface. */
422 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index);
425 ip4_set_arp_limit (u32 arp_limit);
428 ip4_udp_register_listener (vlib_main_t * vm,
430 u32 next_node_index);
433 ip4_icmp_register_type (vlib_main_t * vm, icmp4_type_t type,
436 u16 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, ip4_header_t * ip0);
438 void ip4_register_protocol (u32 protocol, u32 node_index);
440 serialize_function_t serialize_vnet_ip4_main, unserialize_vnet_ip4_main;
442 int vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config);
444 void ip4_mtrie_init (ip4_fib_mtrie_t * m);
446 int vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
449 /* Compute flow hash. We'll use it to select which adjacency to use for this
450 flow. And other things. */
452 ip4_compute_flow_hash (ip4_header_t * ip, u32 flow_hash_config)
454 tcp_header_t * tcp = (void *) (ip + 1);
456 uword is_tcp_udp = (ip->protocol == IP_PROTOCOL_TCP
457 || ip->protocol == IP_PROTOCOL_UDP);
459 t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR)
460 ? ip->src_address.data_u32 : 0;
461 t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR)
462 ? ip->dst_address.data_u32 : 0;
464 a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
465 b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;
466 b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? ip->protocol : 0;
468 t1 = is_tcp_udp ? tcp->ports.src : 0;
469 t2 = is_tcp_udp ? tcp->ports.dst : 0;
471 t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
472 t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;
474 c = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ?
475 (t1<<16) | t2 : (t2<<16) | t1;
477 hash_v3_mix32 (a, b, c);
478 hash_v3_finalize32 (a, b, c);
483 #endif /* included_ip_ip4_h */