FD.io VPP  v20.05.1-5-g09f167997
Vector Packet Processing
ip4.h
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1 /*
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:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
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.
14  */
15 /*
16  * ip/ip4.h: ip4 main include file
17  *
18  * Copyright (c) 2008 Eliot Dresselhaus
19  *
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:
27  *
28  * The above copyright notice and this permission notice shall be
29  * included in all copies or substantial portions of the Software.
30  *
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.
38  */
39 
40 #ifndef included_ip_ip4_h
41 #define included_ip_ip4_h
42 
43 #include <vnet/ip/ip4_packet.h>
44 #include <vnet/ip/lookup.h>
45 #include <vnet/ip/ip_interface.h>
46 #include <vnet/buffer.h>
47 #include <vnet/feature/feature.h>
48 #include <vnet/ip/icmp46_packet.h>
49 #include <vnet/util/throttle.h>
50 
51 typedef struct ip4_mfib_t
52 {
53  /* Hash table for each prefix length mapping. */
55 
56  /* Table ID (hash key) for this FIB. */
58 
59  /* Index into FIB vector. */
61 } ip4_mfib_t;
62 
63 struct ip4_main_t;
64 
66  (struct ip4_main_t * im,
67  uword opaque,
70  u32 address_length, u32 if_address_index, u32 is_del);
71 
72 typedef struct
73 {
77 
79  (struct ip4_main_t * im, uword opaque, u32 sw_if_index, u32 is_enable);
80 
81 typedef struct
82 {
86 
87 typedef void (ip4_table_bind_function_t)
88  (struct ip4_main_t * im,
89  uword opaque, u32 sw_if_index, u32 new_fib_index, u32 old_fib_index);
90 
91 typedef struct
92 {
96 
97 /**
98  * @brief IPv4 main type.
99  *
100  * State of IPv4 VPP processing including:
101  * - FIBs
102  * - Feature indices used in feature topological sort
103  * - Feature node run time references
104  */
105 
106 typedef struct ip4_main_t
107 {
109 
110  /** Vector of FIBs. */
112 
113  /** Vector of MTries. */
115 
116  /** Vector of MFIBs. */
118 
119  u32 fib_masks[33];
120 
121  /** Table index indexed by software interface. */
123 
124  /** Table index indexed by software interface. */
126 
127  /* IP4 enabled count by software interface */
129 
130  /** Hash table mapping table id to fib index.
131  ID space is not necessarily dense; index space is dense. */
133 
134  /** Hash table mapping table id to multicast fib index.
135  ID space is not necessarily dense; index space is dense. */
137 
138  /** Functions to call when interface address changes. */
141 
142  /** Functions to call when interface becomes IPv4 enabled/disable. */
145 
146  /** Functions to call when interface to table biding changes. */
148 
149  /** Template used to generate IP4 ARP packets. */
151 
152  /** Seed for Jenkins hash used to compute ip4 flow hash. */
154 
155  /** @brief Template information for VPP generated packets */
156  struct
157  {
158  /** TTL to use for host generated packets. */
160 
161  /** TOS byte to use for host generated packets. */
163 
164  u8 pad[2];
165  } host_config;
166 
167  /** Heapsize for the Mtries */
169 
170  /** The memory heap for the mtries */
171  void *mtrie_mheap;
172 
173  /** ARP throttling */
175 
176 } ip4_main_t;
177 
178 #define ARP_THROTTLE_BITS (512)
179 
180 /** Global ip4 main structure. */
181 extern ip4_main_t ip4_main;
182 extern char *ip4_error_strings[];
183 
184 /** Global ip4 input node. Errors get attached to ip4 input node. */
195 
198  const ip4_address_t * key,
199  const ip4_address_t * dest, uword dest_length)
200 {
201  return 0 == ((key->data_u32 ^ dest->data_u32) & im->fib_masks[dest_length]);
202 }
203 
206  ip4_address_t * key,
208 {
210  return ip4_destination_matches_route (im, key, a, ia->address_length);
211 }
212 
213 always_inline int
216 {
218  if (PREDICT_TRUE (if_add_index != ~0))
219  {
220  ip_interface_address_t *if_add =
221  pool_elt_at_index (lm->if_address_pool, if_add_index);
222  ip4_address_t *if_ip = ip_interface_address_get_address (lm, if_add);
223  *src = *if_ip;
224  return 0;
225  }
226  else
227  {
228  src->as_u32 = 0;
229  }
230  return (!0);
231 }
232 
233 /* Find interface address which matches destination. */
236  const ip4_address_t * dst,
239  result_ia)
240 {
241  ip_lookup_main_t *lm = &im->lookup_main;
243  ip4_address_t *result = 0;
244 
245  /* *INDENT-OFF* */
246  foreach_ip_interface_address (lm, ia, sw_if_index,
247  1 /* honor unnumbered */,
248  ({
250  if (ip4_destination_matches_route (im, dst, a, ia->address_length))
251  {
252  result = a;
253  break;
254  }
255  }));
256  /* *INDENT-ON* */
257  if (result_ia)
258  *result_ia = result ? ia : 0;
259  return result;
260 }
261 
264  result_ia);
265 
268  ip4_address_t * address,
269  u32 address_length, u32 is_del);
270 
272 
274 
276 
277 uword
279  u16 dst_port, u32 next_node_index);
280 
282  ip4_header_t * ip0);
283 
284 void ip4_register_protocol (u32 protocol, u32 node_index);
285 void ip4_unregister_protocol (u32 protocolx);
286 
288 
290  flow_hash_config_t flow_hash_config);
291 
293  u32 table_index);
294 
295 void ip4_punt_policer_add_del (u8 is_add, u32 policer_index);
296 
297 void ip4_punt_redirect_add (u32 rx_sw_if_index,
298  u32 tx_sw_if_index, ip46_address_t * nh);
299 void ip4_punt_redirect_add_paths (u32 rx_sw_if_index,
301 
302 void ip4_punt_redirect_del (u32 rx_sw_if_index);
303 
304 /* Compute flow hash. We'll use it to select which adjacency to use for this
305  flow. And other things. */
308  flow_hash_config_t flow_hash_config)
309 {
310  tcp_header_t *tcp = (void *) (ip + 1);
311  u32 a, b, c, t1, t2;
312  uword is_tcp_udp = (ip->protocol == IP_PROTOCOL_TCP
313  || ip->protocol == IP_PROTOCOL_UDP);
314 
315  t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR)
316  ? ip->src_address.data_u32 : 0;
317  t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR)
318  ? ip->dst_address.data_u32 : 0;
319 
320  a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
321  b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;
322 
323  t1 = is_tcp_udp ? tcp->src : 0;
324  t2 = is_tcp_udp ? tcp->dst : 0;
325 
326  t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
327  t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;
328 
329  if (flow_hash_config & IP_FLOW_HASH_SYMMETRIC)
330  {
331  if (b < a)
332  {
333  c = a;
334  a = b;
335  b = c;
336  }
337  if (t2 < t1)
338  {
339  t2 += t1;
340  t1 = t2 - t1;
341  t2 = t2 - t1;
342  }
343  }
344 
345  b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? ip->protocol : 0;
346  c = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ?
347  (t1 << 16) | t2 : (t2 << 16) | t1;
348 
349  hash_v3_mix32 (a, b, c);
350  hash_v3_finalize32 (a, b, c);
351 
352  return c;
353 }
354 
355 void
357  vlib_node_runtime_t * node,
358  vlib_frame_t * frame,
359  vlib_rx_or_tx_t which_adj_index);
360 
361 u8 *format_ip4_forward_next_trace (u8 * s, va_list * args);
362 
364 
365 #define IP_DF 0x4000 /* don't fragment */
366 
367 always_inline void *
370  int proto, u8 csum_offload, u8 is_df)
371 {
372  ip4_header_t *ih;
373 
374  /* make some room */
375  ih = vlib_buffer_push_uninit (b, sizeof (ip4_header_t));
376 
377  ih->ip_version_and_header_length = 0x45;
378  ih->tos = 0;
379  ih->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b));
380 
381  /* No fragments */
382  ih->flags_and_fragment_offset = is_df ? clib_host_to_net_u16 (IP_DF) : 0;
383  ih->ttl = 255;
384  ih->protocol = proto;
385  ih->src_address.as_u32 = src->as_u32;
386  ih->dst_address.as_u32 = dst->as_u32;
387 
388  vnet_buffer (b)->l3_hdr_offset = (u8 *) ih - b->data;
389  b->flags |= VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_L3_HDR_OFFSET_VALID;
390 
391  /* Offload ip4 header checksum generation */
392  if (csum_offload)
393  {
394  ih->checksum = 0;
395  b->flags |= VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
396  }
397  else
398  ih->checksum = ip4_header_checksum (ih);
399 
400  return ih;
401 }
402 
403 /**
404  * Push IPv4 header to buffer
405  *
406  * This does not support fragmentation.
407  *
408  * @param vm - vlib_main
409  * @param b - buffer to write the header to
410  * @param src - source IP
411  * @param dst - destination IP
412  * @param prot - payload proto
413  *
414  * @return - pointer to start of IP header
415  */
416 always_inline void *
419  u8 csum_offload)
420 {
421  return vlib_buffer_push_ip4_custom (vm, b, src, dst, proto, csum_offload,
422  1 /* is_df */ );
423 }
424 
427 {
428  u32 fib_index, sw_if_index;
429  sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
430  fib_index = vnet_buffer (b)->sw_if_index[VLIB_TX];
431  return (fib_index == (u32) ~ 0) ?
432  vec_elt (ip4_main.fib_index_by_sw_if_index, sw_if_index) : fib_index;
433 }
434 #endif /* included_ip_ip4_h */
435 
436 /*
437  * fd.io coding-style-patch-verification: ON
438  *
439  * Local Variables:
440  * eval: (c-set-style "gnu")
441  * End:
442  */
u32 flags
buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:124
void ip4_punt_redirect_add(u32 rx_sw_if_index, u32 tx_sw_if_index, ip46_address_t *nh)
u8 pad[3]
log2 (size of the packing page block)
Definition: bihash_doc.h:61
int vnet_set_ip4_flow_hash(u32 table_id, flow_hash_config_t flow_hash_config)
Definition: ip4_forward.c:2817
ip4_add_del_interface_address_callback_t * add_del_interface_address_callbacks
Functions to call when interface address changes.
Definition: ip4.h:140
a
Definition: bitmap.h:538
#define IP_FLOW_HASH_SRC_PORT
Definition: lookup.h:64
A representation of a path as described by a route producer.
Definition: fib_types.h:490
ip4_address_t src_address
Definition: ip4_packet.h:170
u32 index
Definition: ip4.h:60
ip_interface_address_t * if_address_pool
Pool of addresses that are assigned to interfaces.
Definition: lookup.h:148
serialize_function_t serialize_vnet_ip4_main
Definition: ip4.h:287
vl_api_fib_path_nh_t nh
Definition: fib_types.api:126
#define PREDICT_TRUE(x)
Definition: clib.h:119
void ip4_punt_redirect_del(u32 rx_sw_if_index)
static void * ip_interface_address_get_address(ip_lookup_main_t *lm, ip_interface_address_t *a)
Definition: ip_interface.h:43
Definitions for all things IP (v4|v6) unicast and multicast lookup related.
static u32 ip4_compute_flow_hash(const ip4_header_t *ip, flow_hash_config_t flow_hash_config)
Definition: ip4.h:307
ip4_address_t * ip4_interface_first_address(ip4_main_t *im, u32 sw_if_index, ip_interface_address_t **result_ia)
Definition: ip4_forward.c:281
vlib_node_registration_t ip4_punt_node
(constructor) VLIB_REGISTER_NODE (ip4_punt_node)
#define IP_FLOW_HASH_REVERSE_SRC_DST
Definition: lookup.h:66
vlib_node_registration_t ip4_midchain_node
(constructor) VLIB_REGISTER_NODE (ip4_midchain_node)
Definition: ip4_forward.c:2710
static void * vlib_buffer_push_ip4_custom(vlib_main_t *vm, vlib_buffer_t *b, ip4_address_t *src, ip4_address_t *dst, int proto, u8 csum_offload, u8 is_df)
Definition: ip4.h:368
vl_api_address_t src
Definition: gre.api:54
char * ip4_error_strings[]
Definition: ip4_input.c:377
#define IP_FLOW_HASH_DST_PORT
Definition: lookup.h:65
void() serialize_function_t(serialize_main_t *m, va_list *va)
Definition: serialize.h:168
ip_lookup_main_t lookup_main
Definition: ip4.h:108
static uword ip4_destination_matches_route(const ip4_main_t *im, const ip4_address_t *key, const ip4_address_t *dest, uword dest_length)
Definition: ip4.h:197
u32 * fib_index_by_sw_if_index
Table index indexed by software interface.
Definition: ip4.h:122
u16 flags_and_fragment_offset
Definition: ip4_packet.h:151
void ip4_punt_redirect_add_paths(u32 rx_sw_if_index, fib_route_path_t *paths)
#define IP_DF
Definition: ip4.h:365
void ip4_register_protocol(u32 protocol, u32 node_index)
Definition: ip4_forward.c:1933
uword ip4_udp_register_listener(vlib_main_t *vm, u16 dst_port, u32 next_node_index)
static uword vlib_buffer_length_in_chain(vlib_main_t *vm, vlib_buffer_t *b)
Get length in bytes of the buffer chain.
Definition: buffer_funcs.h:402
struct _tcp_header tcp_header_t
#define hash_v3_mix32(a, b, c)
Definition: hash.h:554
unsigned char u8
Definition: types.h:56
vlib_node_registration_t ip4_lookup_node
(constructor) VLIB_REGISTER_NODE (ip4_lookup_node)
Definition: ip4_forward.c:104
vlib_node_registration_t ip4_rewrite_mcast_node
(constructor) VLIB_REGISTER_NODE (ip4_rewrite_mcast_node)
Definition: ip4_forward.c:2694
vl_api_ip_proto_t protocol
Definition: lb_types.api:71
vlib_rx_or_tx_t
Definition: defs.h:44
u32 * mfib_index_by_sw_if_index
Table index indexed by software interface.
Definition: ip4.h:125
ip4_enable_disable_interface_callback_t * enable_disable_interface_callbacks
Functions to call when interface becomes IPv4 enabled/disable.
Definition: ip4.h:144
vl_api_interface_index_t sw_if_index
Definition: gre.api:53
#define IP_FLOW_HASH_DST_ADDR
Definition: lookup.h:62
ip4_address_t dst_address
Definition: ip4_packet.h:170
unsigned int u32
Definition: types.h:88
struct mfib_table_t_ * mfibs
Vector of MFIBs.
Definition: ip4.h:117
int vnet_set_ip4_classify_intfc(vlib_main_t *vm, u32 sw_if_index, u32 table_index)
Definition: ip4_forward.c:2971
void ip4_directed_broadcast(u32 sw_if_index, u8 enable)
Definition: ip4_forward.c:882
vlib_node_registration_t ip4_arp_node
(constructor) VLIB_REGISTER_NODE (ip4_arp_node)
Definition: ip4_neighbor.c:261
clib_error_t * ip4_add_del_interface_address(vlib_main_t *vm, u32 sw_if_index, ip4_address_t *address, u32 address_length, u32 is_del)
Definition: ip4_forward.c:872
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:534
void ip4_sw_interface_enable_disable(u32 sw_if_index, u32 is_enable)
Definition: ip4_forward.c:640
uword * fib_index_by_table_id
Hash table mapping table id to fib index.
Definition: ip4.h:132
vlib_node_registration_t ip4_input_node
Global ip4 input node.
Definition: ip4_input.c:385
vl_api_ip_proto_t proto
Definition: acl_types.api:50
uword mtrie_heap_size
Heapsize for the Mtries.
Definition: ip4.h:168
unsigned short u16
Definition: types.h:57
u8 * ip_enabled_by_sw_if_index
Definition: ip4.h:128
Definition: ip4.h:51
#define always_inline
Definition: ipsec.h:28
u32 ip4_tcp_udp_validate_checksum(vlib_main_t *vm, vlib_buffer_t *p0)
Definition: ip4_forward.c:1400
void * mtrie_mheap
The memory heap for the mtries.
Definition: ip4.h:171
vl_api_address_t dst
Definition: gre.api:55
A throttle Used in the data plane to decide if a given hash should be throttled, i.e.
Definition: throttle.h:28
void() ip4_table_bind_function_t(struct ip4_main_t *im, uword opaque, u32 sw_if_index, u32 new_fib_index, u32 old_fib_index)
Definition: ip4.h:88
The IPv4 FIB.
Definition: ip4_fib.h:39
svmdb_client_t * c
vlib_node_registration_t ip4_rewrite_node
(constructor) VLIB_REGISTER_NODE (ip4_rewrite_node)
Definition: ip4_forward.c:2672
void() ip4_enable_disable_interface_function_t(struct ip4_main_t *im, uword opaque, u32 sw_if_index, u32 is_enable)
Definition: ip4.h:79
int ip4_address_compare(ip4_address_t *a1, ip4_address_t *a2)
Definition: ip46_cli.c:53
serialize_function_t unserialize_vnet_ip4_main
Definition: ip4.h:287
static ip4_address_t * ip4_interface_address_matching_destination(ip4_main_t *im, const ip4_address_t *dst, u32 sw_if_index, ip_interface_address_t **result_ia)
Definition: ip4.h:235
u8 data[]
Packet data.
Definition: buffer.h:181
void ip4_punt_policer_add_del(u8 is_add, u32 policer_index)
vl_api_fib_path_t paths[n_paths]
Definition: ip.api:146
#define IP_FLOW_HASH_SYMMETRIC
Definition: lookup.h:67
u32 * if_address_pool_index_by_sw_if_index
Head of doubly linked list of interface addresses for each software interface.
Definition: lookup.h:155
vlib_packet_template_t ip4_arp_request_packet_template
Template used to generate IP4 ARP packets.
Definition: ip4.h:150
uword * fib_entry_by_dst_address[65]
Definition: ip4.h:54
vl_api_interface_index_t tx_sw_if_index
Definition: ip.api:441
#define IP_FLOW_HASH_SRC_ADDR
Flow hash configuration.
Definition: lookup.h:61
manual_print typedef address
Definition: ip_types.api:85
u16 ip4_tcp_udp_compute_checksum(vlib_main_t *vm, vlib_buffer_t *p0, ip4_header_t *ip0)
Definition: ip4_forward.c:1367
ip_dscp_t tos
Definition: ip4_packet.h:141
#define hash_v3_finalize32(a, b, c)
Definition: hash.h:564
IPv4 main type.
Definition: ip4.h:106
throttle_t arp_throttle
ARP throttling.
Definition: ip4.h:174
static u32 vlib_buffer_get_ip4_fib_index(vlib_buffer_t *b)
Definition: ip4.h:426
u32 flow_hash_config_t
A flow hash configuration is a mask of the flow hash options.
Definition: lookup.h:84
#define vec_elt(v, i)
Get vector value at index i.
ip4_table_bind_callback_t * table_bind_callbacks
Functions to call when interface to table biding changes.
Definition: ip4.h:147
typedef key
Definition: ipsec_types.api:85
struct _vlib_node_registration vlib_node_registration_t
Definition: defs.h:47
static void * vlib_buffer_push_uninit(vlib_buffer_t *b, u8 size)
Prepend uninitialized data to buffer.
Definition: buffer.h:335
struct ip4_main_t ip4_main_t
IPv4 main type.
vl_api_address_t ip
Definition: l2.api:501
struct ip4_fib_t_ * v4_fibs
Vector of MTries.
Definition: ip4.h:114
void ip4_forward_next_trace(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, vlib_rx_or_tx_t which_adj_index)
Definition: ip4_forward.c:1279
#define foreach_ip_interface_address(lm, a, sw_if_index, loop, body)
Definition: ip_interface.h:57
vlib_node_registration_t ip4_rewrite_local_node
VLIB buffer representation.
Definition: buffer.h:102
u64 uword
Definition: types.h:112
void() ip4_add_del_interface_address_function_t(struct ip4_main_t *im, uword opaque, u32 sw_if_index, ip4_address_t *address, u32 address_length, u32 if_address_index, u32 is_del)
Definition: ip4.h:66
u8 * format_ip4_forward_next_trace(u8 *s, va_list *args)
Definition: ip4_forward.c:1229
vlib_node_registration_t ip4_glean_node
(constructor) VLIB_REGISTER_NODE (ip4_glean_node)
Definition: ip4_neighbor.c:274
static uword ip4_destination_matches_interface(ip4_main_t *im, ip4_address_t *key, ip_interface_address_t *ia)
Definition: ip4.h:205
#define vnet_buffer(b)
Definition: buffer.h:417
A protocol Independent IP multicast FIB table.
Definition: mfib_table.h:71
ip4_main_t ip4_main
Global ip4 main structure.
Definition: ip4_forward.c:1144
struct fib_table_t_ * fibs
Vector of FIBs.
Definition: ip4.h:111
#define IP_FLOW_HASH_PROTO
Definition: lookup.h:63
struct ip4_mfib_t ip4_mfib_t
u32 table_id
Definition: ip4.h:57
u32 flow_hash_seed
Seed for Jenkins hash used to compute ip4 flow hash.
Definition: ip4.h:153
u16 dst_port
Definition: udp.api:42
uword * mfib_index_by_table_id
Hash table mapping table id to multicast fib index.
Definition: ip4.h:136
u8 ip_version_and_header_length
Definition: ip4_packet.h:138
vlib_node_registration_t ip4_local_node
(constructor) VLIB_REGISTER_NODE (ip4_local_node)
Definition: ip4_forward.c:1888
static int ip4_src_address_for_packet(ip_lookup_main_t *lm, u32 sw_if_index, ip4_address_t *src)
Definition: ip4.h:214
u8 ttl
TTL to use for host generated packets.
Definition: ip4.h:159
static void * vlib_buffer_push_ip4(vlib_main_t *vm, vlib_buffer_t *b, ip4_address_t *src, ip4_address_t *dst, int proto, u8 csum_offload)
Push IPv4 header to buffer.
Definition: ip4.h:417
static u16 ip4_header_checksum(ip4_header_t *i)
Definition: ip4_packet.h:247
void ip4_unregister_protocol(u32 protocolx)
Definition: ip4_forward.c:1945
u8 tos
TOS byte to use for host generated packets.
Definition: ip4.h:162
Definition: defs.h:46
IP prefix management on interfaces.
A protocol Independent FIB table.
Definition: fib_table.h:71
u32 fib_masks[33]
Definition: ip4.h:119