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,
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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/feature/feature.h>
48 typedef struct ip4_fib_t {
49 /* Hash table for each prefix length mapping. */
50 uword * fib_entry_by_dst_address[33];
52 /* Mtrie for fast lookups. Hash is used to maintain overlapping prefixes. */
53 ip4_fib_mtrie_t mtrie;
55 /* Table ID (hash key) for this FIB. */
58 /* Index into FIB vector. */
61 /* flow hash configuration */
62 flow_hash_config_t flow_hash_config;
64 /* N-tuple classifier indices */
65 u32 fwd_classify_table_index;
66 u32 rev_classify_table_index;
72 typedef void (ip4_add_del_interface_address_function_t)
73 (struct ip4_main_t * im,
76 ip4_address_t * address,
82 ip4_add_del_interface_address_function_t * function;
83 uword function_opaque;
84 } ip4_add_del_interface_address_callback_t;
87 * @brief IPv4 main type.
89 * State of IPv4 VPP processing including:
91 * - Feature indices used in feature topological sort
92 * - Feature node run time references
95 typedef struct ip4_main_t {
96 ip_lookup_main_t lookup_main;
98 /** Vector of FIBs. */
99 struct fib_table_t_ * fibs;
103 /** Table index indexed by software interface. */
104 u32 * fib_index_by_sw_if_index;
106 /* IP4 enabled count by software interface */
107 u8 * ip_enabled_by_sw_if_index;
109 /** Hash table mapping table id to fib index.
110 ID space is not necessarily dense; index space is dense. */
111 uword * fib_index_by_table_id;
113 /** Functions to call when interface address changes. */
114 ip4_add_del_interface_address_callback_t * add_del_interface_address_callbacks;
116 /** Template used to generate IP4 ARP packets. */
117 vlib_packet_template_t ip4_arp_request_packet_template;
119 /** Seed for Jenkins hash used to compute ip4 flow hash. */
122 /** @brief Template information for VPP generated packets */
124 /** TTL to use for host generated packets. */
127 /** TOS byte to use for host generated packets. */
134 /** Global ip4 main structure. */
135 extern ip4_main_t ip4_main;
137 /** Global ip4 input node. Errors get attached to ip4 input node. */
138 extern vlib_node_registration_t ip4_input_node;
139 extern vlib_node_registration_t ip4_lookup_node;
140 extern vlib_node_registration_t ip4_rewrite_node;
141 extern vlib_node_registration_t ip4_rewrite_local_node;
142 extern vlib_node_registration_t ip4_arp_node;
143 extern vlib_node_registration_t ip4_glean_node;
144 extern vlib_node_registration_t ip4_midchain_node;
147 ip4_destination_matches_route (const ip4_main_t * im,
148 const ip4_address_t * key,
149 const ip4_address_t * dest,
151 { return 0 == ((key->data_u32 ^ dest->data_u32) & im->fib_masks[dest_length]); }
154 ip4_destination_matches_interface (ip4_main_t * im,
156 ip_interface_address_t * ia)
158 ip4_address_t * a = ip_interface_address_get_address (&im->lookup_main, ia);
159 return ip4_destination_matches_route (im, key, a, ia->address_length);
162 /* As above but allows for unaligned destinations (e.g. works right from IP header of packet). */
164 ip4_unaligned_destination_matches_route (ip4_main_t * im,
166 ip4_address_t * dest,
168 { return 0 == ((clib_mem_unaligned (&key->data_u32, u32) ^ dest->data_u32) & im->fib_masks[dest_length]); }
171 ip4_src_address_for_packet (ip_lookup_main_t * lm,
176 lm->if_address_pool_index_by_sw_if_index[sw_if_index];
177 if (PREDICT_TRUE(if_add_index != ~0)) {
178 ip_interface_address_t *if_add =
179 pool_elt_at_index(lm->if_address_pool, if_add_index);
180 ip4_address_t *if_ip =
181 ip_interface_address_get_address(lm, if_add);
193 /* Find interface address which matches destination. */
194 always_inline ip4_address_t *
195 ip4_interface_address_matching_destination (ip4_main_t * im, ip4_address_t * dst, u32 sw_if_index,
196 ip_interface_address_t ** result_ia)
198 ip_lookup_main_t * lm = &im->lookup_main;
199 ip_interface_address_t * ia;
200 ip4_address_t * result = 0;
202 foreach_ip_interface_address (lm, ia, sw_if_index,
203 1 /* honor unnumbered */,
205 ip4_address_t * a = ip_interface_address_get_address (lm, ia);
206 if (ip4_destination_matches_route (im, dst, a, ia->address_length))
213 *result_ia = result ? ia : 0;
218 ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
219 ip_interface_address_t ** result_ia);
222 ip4_add_del_interface_address (vlib_main_t * vm, u32 sw_if_index,
223 ip4_address_t * address, u32 address_length,
227 ip4_sw_interface_enable_disable (u32 sw_if_index,
230 int ip4_address_compare (ip4_address_t * a1, ip4_address_t * a2);
232 /* Send an ARP request to see if given destination is reachable on given interface. */
234 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index);
237 ip4_set_arp_limit (u32 arp_limit);
240 ip4_udp_register_listener (vlib_main_t * vm,
242 u32 next_node_index);
245 ip4_icmp_register_type (vlib_main_t * vm, icmp4_type_t type,
248 u16 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, ip4_header_t * ip0);
250 void ip4_register_protocol (u32 protocol, u32 node_index);
252 serialize_function_t serialize_vnet_ip4_main, unserialize_vnet_ip4_main;
254 int vnet_set_ip4_flow_hash (u32 table_id, flow_hash_config_t flow_hash_config);
256 void ip4_mtrie_init (ip4_fib_mtrie_t * m);
258 int vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
261 /* Compute flow hash. We'll use it to select which adjacency to use for this
262 flow. And other things. */
264 ip4_compute_flow_hash (const ip4_header_t * ip,
265 flow_hash_config_t flow_hash_config)
267 tcp_header_t * tcp = (void *) (ip + 1);
269 uword is_tcp_udp = (ip->protocol == IP_PROTOCOL_TCP
270 || ip->protocol == IP_PROTOCOL_UDP);
272 t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR)
273 ? ip->src_address.data_u32 : 0;
274 t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR)
275 ? ip->dst_address.data_u32 : 0;
277 a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
278 b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;
279 b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? ip->protocol : 0;
281 t1 = is_tcp_udp ? tcp->ports.src : 0;
282 t2 = is_tcp_udp ? tcp->ports.dst : 0;
284 t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
285 t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;
287 c = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ?
288 (t1<<16) | t2 : (t2<<16) | t1;
290 hash_v3_mix32 (a, b, c);
291 hash_v3_finalize32 (a, b, c);
297 ip4_forward_next_trace (vlib_main_t * vm,
298 vlib_node_runtime_t * node,
299 vlib_frame_t * frame,
300 vlib_rx_or_tx_t which_adj_index);
302 u8 * format_ip4_forward_next_trace (u8 * s, va_list * args);
304 u32 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0);
306 #endif /* included_ip_ip4_h */