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_packet.h>
44 #include <vnet/ip/lookup.h>
45 #include <vnet/feature/feature.h>
47 typedef struct ip4_mfib_t
49 /* Hash table for each prefix length mapping. */
50 uword *fib_entry_by_dst_address[65];
52 /* Table ID (hash key) for this FIB. */
55 /* Index into FIB vector. */
61 typedef void (ip4_add_del_interface_address_function_t)
62 (struct ip4_main_t * im,
65 ip4_address_t * address,
66 u32 address_length, u32 if_address_index, u32 is_del);
70 ip4_add_del_interface_address_function_t *function;
71 uword function_opaque;
72 } ip4_add_del_interface_address_callback_t;
75 * @brief IPv4 main type.
77 * State of IPv4 VPP processing including:
79 * - Feature indices used in feature topological sort
80 * - Feature node run time references
83 typedef struct ip4_main_t
85 ip_lookup_main_t lookup_main;
87 /** Vector of FIBs. */
88 struct fib_table_t_ *fibs;
90 /** Vector of MTries. */
91 struct ip4_fib_t_ *v4_fibs;
93 /** Vector of MFIBs. */
94 struct mfib_table_t_ *mfibs;
98 /** Table index indexed by software interface. */
99 u32 *fib_index_by_sw_if_index;
101 /** Table index indexed by software interface. */
102 u32 *mfib_index_by_sw_if_index;
104 /* IP4 enabled count by software interface */
105 u8 *ip_enabled_by_sw_if_index;
107 /** Hash table mapping table id to fib index.
108 ID space is not necessarily dense; index space is dense. */
109 uword *fib_index_by_table_id;
111 /** Hash table mapping table id to multicast fib index.
112 ID space is not necessarily dense; index space is dense. */
113 uword *mfib_index_by_table_id;
115 /** Functions to call when interface address changes. */
116 ip4_add_del_interface_address_callback_t
117 * add_del_interface_address_callbacks;
119 /** Template used to generate IP4 ARP packets. */
120 vlib_packet_template_t ip4_arp_request_packet_template;
122 /** Seed for Jenkins hash used to compute ip4 flow hash. */
125 /** @brief Template information for VPP generated packets */
128 /** TTL to use for host generated packets. */
131 /** TOS byte to use for host generated packets. */
138 /** Global ip4 main structure. */
139 extern ip4_main_t ip4_main;
141 /** Global ip4 input node. Errors get attached to ip4 input node. */
142 extern vlib_node_registration_t ip4_input_node;
143 extern vlib_node_registration_t ip4_lookup_node;
144 extern vlib_node_registration_t ip4_local_node;
145 extern vlib_node_registration_t ip4_rewrite_node;
146 extern vlib_node_registration_t ip4_rewrite_mcast_node;
147 extern vlib_node_registration_t ip4_rewrite_local_node;
148 extern vlib_node_registration_t ip4_arp_node;
149 extern vlib_node_registration_t ip4_glean_node;
150 extern vlib_node_registration_t ip4_midchain_node;
153 ip4_destination_matches_route (const ip4_main_t * im,
154 const ip4_address_t * key,
155 const ip4_address_t * dest, uword dest_length)
157 return 0 == ((key->data_u32 ^ dest->data_u32) & im->fib_masks[dest_length]);
161 ip4_destination_matches_interface (ip4_main_t * im,
163 ip_interface_address_t * ia)
165 ip4_address_t *a = ip_interface_address_get_address (&im->lookup_main, ia);
166 return ip4_destination_matches_route (im, key, a, ia->address_length);
169 /* As above but allows for unaligned destinations (e.g. works right from IP header of packet). */
171 ip4_unaligned_destination_matches_route (ip4_main_t * im,
173 ip4_address_t * dest,
177 ((clib_mem_unaligned (&key->data_u32, u32) ^ dest->
178 data_u32) & im->fib_masks[dest_length]);
182 ip4_src_address_for_packet (ip_lookup_main_t * lm,
183 u32 sw_if_index, ip4_address_t * src)
185 u32 if_add_index = lm->if_address_pool_index_by_sw_if_index[sw_if_index];
186 if (PREDICT_TRUE (if_add_index != ~0))
188 ip_interface_address_t *if_add =
189 pool_elt_at_index (lm->if_address_pool, if_add_index);
190 ip4_address_t *if_ip = ip_interface_address_get_address (lm, if_add);
201 /* Find interface address which matches destination. */
202 always_inline ip4_address_t *
203 ip4_interface_address_matching_destination (ip4_main_t * im,
206 ip_interface_address_t **
209 ip_lookup_main_t *lm = &im->lookup_main;
210 ip_interface_address_t *ia;
211 ip4_address_t *result = 0;
214 foreach_ip_interface_address (lm, ia, sw_if_index,
215 1 /* honor unnumbered */,
217 ip4_address_t * a = ip_interface_address_get_address (lm, ia);
218 if (ip4_destination_matches_route (im, dst, a, ia->address_length))
226 *result_ia = result ? ia : 0;
230 ip4_address_t *ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
231 ip_interface_address_t **
234 clib_error_t *ip4_add_del_interface_address (vlib_main_t * vm,
236 ip4_address_t * address,
237 u32 address_length, u32 is_del);
239 void ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable);
241 int ip4_address_compare (ip4_address_t * a1, ip4_address_t * a2);
243 /* Send an ARP request to see if given destination is reachable on given interface. */
244 clib_error_t *ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst,
247 clib_error_t *ip4_set_arp_limit (u32 arp_limit);
250 ip4_udp_register_listener (vlib_main_t * vm,
251 u16 dst_port, u32 next_node_index);
254 ip4_icmp_register_type (vlib_main_t * vm, icmp4_type_t type, u32 node_index);
256 u16 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
259 void ip4_register_protocol (u32 protocol, u32 node_index);
261 serialize_function_t serialize_vnet_ip4_main, unserialize_vnet_ip4_main;
263 int vnet_set_ip4_flow_hash (u32 table_id,
264 flow_hash_config_t flow_hash_config);
266 int vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
269 /* Compute flow hash. We'll use it to select which adjacency to use for this
270 flow. And other things. */
272 ip4_compute_flow_hash (const ip4_header_t * ip,
273 flow_hash_config_t flow_hash_config)
275 tcp_header_t *tcp = (void *) (ip + 1);
277 uword is_tcp_udp = (ip->protocol == IP_PROTOCOL_TCP
278 || ip->protocol == IP_PROTOCOL_UDP);
280 t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR)
281 ? ip->src_address.data_u32 : 0;
282 t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR)
283 ? ip->dst_address.data_u32 : 0;
285 a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
286 b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;
287 b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? ip->protocol : 0;
289 t1 = is_tcp_udp ? tcp->src : 0;
290 t2 = is_tcp_udp ? tcp->dst : 0;
292 t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
293 t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;
295 c = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ?
296 (t1 << 16) | t2 : (t2 << 16) | t1;
298 hash_v3_mix32 (a, b, c);
299 hash_v3_finalize32 (a, b, c);
305 ip4_forward_next_trace (vlib_main_t * vm,
306 vlib_node_runtime_t * node,
307 vlib_frame_t * frame,
308 vlib_rx_or_tx_t which_adj_index);
310 u8 *format_ip4_forward_next_trace (u8 * s, va_list * args);
312 u32 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0);
314 #define IP_DF 0x4000 /* don't fragment */
317 * Push IPv4 header to buffer
319 * This does not support fragmentation.
321 * @param vm - vlib_main
322 * @param b - buffer to write the header to
323 * @param src - source IP
324 * @param dst - destination IP
325 * @param prot - payload proto
327 * @return - pointer to start of IP header
330 vlib_buffer_push_ip4 (vlib_main_t * vm, vlib_buffer_t * b,
331 ip4_address_t * src, ip4_address_t * dst, int proto)
336 ih = vlib_buffer_push_uninit (b, sizeof (ip4_header_t));
338 ih->ip_version_and_header_length = 0x45;
340 ih->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b));
343 ih->flags_and_fragment_offset = clib_host_to_net_u16 (IP_DF);
345 ih->protocol = proto;
346 ih->src_address.as_u32 = src->as_u32;
347 ih->dst_address.as_u32 = dst->as_u32;
349 ih->checksum = ip4_header_checksum (ih);
352 #endif /* included_ip_ip4_h */
355 * fd.io coding-style-patch-verification: ON
358 * eval: (c-set-style "gnu")