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/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>
47 typedef struct ip4_fib_t {
48 /* Hash table for each prefix length mapping. */
49 uword * adj_index_by_dst_address[33];
51 /* Temporary vectors for holding new/old values for hash_set. */
52 uword * new_hash_values, * old_hash_values;
54 /* Mtrie for fast lookups. Hash is used to maintain overlapping prefixes. */
55 ip4_fib_mtrie_t mtrie;
57 /* Table ID (hash key) for this FIB. */
60 /* Index into FIB vector. */
63 /* flow hash configuration */
66 /* N-tuple classifier indices */
67 u32 fwd_classify_table_index;
68 u32 rev_classify_table_index;
74 typedef void (ip4_add_del_route_function_t)
75 (struct ip4_main_t * im,
79 ip4_address_t * address,
85 ip4_add_del_route_function_t * function;
87 uword function_opaque;
88 } ip4_add_del_route_callback_t;
90 typedef void (ip4_add_del_interface_address_function_t)
91 (struct ip4_main_t * im,
94 ip4_address_t * address,
100 ip4_add_del_interface_address_function_t * function;
101 uword function_opaque;
102 } ip4_add_del_interface_address_callback_t;
105 /* First check access list to either permit or deny this
106 packet based on classification. */
107 IP4_RX_FEATURE_CHECK_ACCESS,
109 /* RPF check: verify that source address is reachable via
110 RX interface or via any interface. */
111 IP4_RX_FEATURE_SOURCE_CHECK_REACHABLE_VIA_RX,
112 IP4_RX_FEATURE_SOURCE_CHECK_REACHABLE_VIA_ANY,
115 IP4_RX_FEATURE_IPSEC,
117 /* vPath forwarding: won't return to call next feature
118 so any feature needed before vPath forwarding must be prior
120 IP4_RX_FEATURE_VPATH,
122 /* Must be last: perform forwarding lookup. */
123 IP4_RX_FEATURE_LOOKUP,
126 } ip4_rx_feature_type_t;
128 typedef struct ip4_main_t {
129 ip_lookup_main_t lookup_main;
131 /* Vector of FIBs. */
136 /* Table index indexed by software interface. */
137 u32 * fib_index_by_sw_if_index;
139 /* Hash table mapping table id to fib index.
140 ID space is not necessarily dense; index space is dense. */
141 uword * fib_index_by_table_id;
143 /* Vector of functions to call when routes are added/deleted. */
144 ip4_add_del_route_callback_t * add_del_route_callbacks;
146 /* Hash table mapping interface route rewrite adjacency index by sw if index. */
147 uword * interface_route_adj_index_by_sw_if_index;
149 /* Functions to call when interface address changes. */
150 ip4_add_del_interface_address_callback_t * add_del_interface_address_callbacks;
152 /* Template used to generate IP4 ARP packets. */
153 vlib_packet_template_t ip4_arp_request_packet_template;
155 /* Seed for Jenkins hash used to compute ip4 flow hash. */
159 /* TTL to use for host generated packets. */
162 /* TOS byte to use for host generated packets. */
169 /* Global ip4 main structure. */
170 extern ip4_main_t ip4_main;
172 /* Global ip4 input node. Errors get attached to ip4 input node. */
173 extern vlib_node_registration_t ip4_input_node;
174 extern vlib_node_registration_t ip4_lookup_node;
175 extern vlib_node_registration_t ip4_rewrite_node;
176 extern vlib_node_registration_t ip4_rewrite_local_node;
177 extern vlib_node_registration_t ip4_arp_node;
179 u32 ip4_fib_lookup_with_table (ip4_main_t * im, u32 fib_index, ip4_address_t * dst,
180 u32 disable_default_route);
183 ip4_fib_lookup_buffer (ip4_main_t * im, u32 fib_index, ip4_address_t * dst,
186 return ip4_fib_lookup_with_table (im, fib_index, dst,
187 /* disable_default_route */ 0);
191 ip4_fib_lookup (ip4_main_t * im, u32 sw_if_index, ip4_address_t * dst)
193 u32 fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
194 return ip4_fib_lookup_with_table (im, fib_index, dst,
195 /* disable_default_route */ 0);
199 ip4_destination_matches_route (ip4_main_t * im,
201 ip4_address_t * dest,
203 { return 0 == ((key->data_u32 ^ dest->data_u32) & im->fib_masks[dest_length]); }
206 ip4_destination_matches_interface (ip4_main_t * im,
208 ip_interface_address_t * ia)
210 ip4_address_t * a = ip_interface_address_get_address (&im->lookup_main, ia);
211 return ip4_destination_matches_route (im, key, a, ia->address_length);
214 /* As above but allows for unaligned destinations (e.g. works right from IP header of packet). */
216 ip4_unaligned_destination_matches_route (ip4_main_t * im,
218 ip4_address_t * dest,
220 { return 0 == ((clib_mem_unaligned (&key->data_u32, u32) ^ dest->data_u32) & im->fib_masks[dest_length]); }
223 ip4_src_address_for_packet (ip4_main_t * im, vlib_buffer_t * p, ip4_address_t * src, u32 sw_if_index)
225 ip_lookup_main_t * lm = &im->lookup_main;
226 ip_interface_address_t * ia = ip_interface_address_for_packet (lm, p, sw_if_index);
227 ip4_address_t * a = ip_interface_address_get_address (lm, ia);
231 /* Find interface address which matches destination. */
232 always_inline ip4_address_t *
233 ip4_interface_address_matching_destination (ip4_main_t * im, ip4_address_t * dst, u32 sw_if_index,
234 ip_interface_address_t ** result_ia)
236 ip_lookup_main_t * lm = &im->lookup_main;
237 ip_interface_address_t * ia;
238 ip4_address_t * result = 0;
240 foreach_ip_interface_address (lm, ia, sw_if_index,
241 1 /* honor unnumbered */,
243 ip4_address_t * a = ip_interface_address_get_address (lm, ia);
244 if (ip4_destination_matches_route (im, dst, a, ia->address_length))
251 *result_ia = result ? ia : 0;
256 ip4_add_del_interface_address (vlib_main_t * vm, u32 sw_if_index,
257 ip4_address_t * address, u32 address_length,
260 int ip4_address_compare (ip4_address_t * a1, ip4_address_t * a2);
262 /* Add/del a route to the FIB. */
264 #define IP4_ROUTE_FLAG_ADD (0 << 0)
265 #define IP4_ROUTE_FLAG_DEL (1 << 0)
266 #define IP4_ROUTE_FLAG_TABLE_ID (0 << 1)
267 #define IP4_ROUTE_FLAG_FIB_INDEX (1 << 1)
268 #define IP4_ROUTE_FLAG_KEEP_OLD_ADJACENCY (1 << 2)
269 #define IP4_ROUTE_FLAG_NO_REDISTRIBUTE (1 << 3)
270 /* Not last add/del in group. Facilities batching requests into packets. */
271 #define IP4_ROUTE_FLAG_NOT_LAST_IN_GROUP (1 << 4)
272 /* Dynamic route created via ARP reply. */
273 #define IP4_ROUTE_FLAG_NEIGHBOR (1 << 5)
276 /* IP4_ROUTE_FLAG_* */
279 /* Either index of fib or table_id to hash and get fib.
280 IP4_ROUTE_FLAG_FIB_INDEX specifies index; otherwise table_id is assumed. */
281 u32 table_index_or_table_id;
283 /* Destination address (prefix) and length. */
284 ip4_address_t dst_address;
285 u32 dst_address_length;
287 /* Adjacency to use for this destination. */
290 /* If specified adjacencies to add and then
291 use for this destination. add_adj/n_add_adj
292 are override adj_index if specified. */
293 ip_adjacency_t * add_adj;
295 } ip4_add_del_route_args_t;
298 * \brief Get or create an IPv4 fib.
300 * Get or create an IPv4 fib with the provided fib ID or index.
301 * The fib ID is a possibly-sparse user-defined value while
302 * the fib index defines the position of the fib in the fib vector.
306 * \param table_index_or_id
307 * The table index if \c IP4_ROUTE_FLAG_FIB_INDEX bit is set in \p flags.
308 * Otherwise, when set to \c ~0, an arbitrary and unused fib ID is picked
309 * and can be retrieved with \c ret->table_id.
310 * Otherwise, the fib ID to be used to retrieve or create the desired fib.
312 * Indicates whether \p table_index_or_id is the fib index or ID.
313 * When the bit \c IP4_ROUTE_FLAG_FIB_INDEX is set, \p table_index_or_id
314 * is considered as the fib index, and the fib ID otherwise.
315 * \returns A pointer to the retrieved or created fib.
317 * \remark When getting a fib with the fib index, the fib MUST already exist.
320 find_ip4_fib_by_table_index_or_id (ip4_main_t * im,
321 u32 table_index_or_id, u32 flags);
323 void ip4_add_del_route (ip4_main_t * im, ip4_add_del_route_args_t * args);
325 void ip4_add_del_route_next_hop (ip4_main_t * im,
327 ip4_address_t * dst_address,
328 u32 dst_address_length,
329 ip4_address_t * next_hop,
330 u32 next_hop_sw_if_index,
331 u32 next_hop_weight, u32 adj_index,
332 u32 explicit_fib_index);
335 ip4_get_route (ip4_main_t * im,
336 u32 fib_index_or_table_id,
342 ip4_foreach_matching_route (ip4_main_t * im,
343 u32 table_index_or_table_id,
345 ip4_address_t * address,
347 ip4_address_t ** results,
348 u8 ** result_lengths);
350 void ip4_delete_matching_routes (ip4_main_t * im,
351 u32 table_index_or_table_id,
353 ip4_address_t * address,
356 void ip4_maybe_remap_adjacencies (ip4_main_t * im,
357 u32 table_index_or_table_id,
360 void ip4_adjacency_set_interface_route (vnet_main_t * vnm,
361 ip_adjacency_t * adj,
363 u32 if_address_index);
365 /* Send an ARP request to see if given destination is reachable on given interface. */
367 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index);
370 ip4_set_arp_limit (u32 arp_limit);
373 ip4_udp_register_listener (vlib_main_t * vm,
375 u32 next_node_index);
378 ip4_icmp_register_type (vlib_main_t * vm, icmp4_type_t type,
381 u16 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, ip4_header_t * ip0);
383 void ip4_register_protocol (u32 protocol, u32 node_index);
385 serialize_function_t serialize_vnet_ip4_main, unserialize_vnet_ip4_main;
387 int vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config);
389 void ip4_mtrie_init (ip4_fib_mtrie_t * m);
391 int vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
394 /* Compute flow hash. We'll use it to select which adjacency to use for this
395 flow. And other things. */
397 ip4_compute_flow_hash (ip4_header_t * ip, u32 flow_hash_config)
399 tcp_header_t * tcp = (void *) (ip + 1);
401 uword is_tcp_udp = (ip->protocol == IP_PROTOCOL_TCP
402 || ip->protocol == IP_PROTOCOL_UDP);
404 t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR)
405 ? ip->src_address.data_u32 : 0;
406 t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR)
407 ? ip->dst_address.data_u32 : 0;
409 a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
410 b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;
411 b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? ip->protocol : 0;
413 t1 = is_tcp_udp ? tcp->ports.src : 0;
414 t2 = is_tcp_udp ? tcp->ports.dst : 0;
416 t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
417 t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;
419 c = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ?
420 (t1<<16) | t2 : (t2<<16) | t1;
422 hash_v3_mix32 (a, b, c);
423 hash_v3_finalize32 (a, b, c);
428 #endif /* included_ip_ip4_h */