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Vector Packet Processing
interface.c
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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  * ethernet_interface.c: ethernet interfaces
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 #include <vnet/vnet.h>
41 #include <vnet/ip/ip.h>
42 #include <vnet/pg/pg.h>
43 #include <vnet/ethernet/ethernet.h>
44 #include <vnet/l2/l2_input.h>
45 #include <vnet/l2/l2_bd.h>
46 #include <vnet/adj/adj.h>
47 
48 /**
49  * @file
50  * @brief Loopback Interfaces.
51  *
52  * This file contains code to manage loopback interfaces.
53  */
54 
55 const u8 *
57 {
58  const static u8 ethernet_mcast_dst_mac[] = {
59  0x1, 0x0, 0x5e, 0x0, 0x0, 0x0,
60  };
61 
62  return (ethernet_mcast_dst_mac);
63 }
64 
65 const u8 *
67 {
68  const static u8 ethernet_mcast_dst_mac[] = {
69  0x33, 0x33, 0x00, 0x0, 0x0, 0x0,
70  };
71 
72  return (ethernet_mcast_dst_mac);
73 }
74 
75 /**
76  * @brief build a rewrite string to use for sending packets of type 'link_type'
77  * to 'dst_address'
78  */
79 u8 *
82  vnet_link_t link_type, const void *dst_address)
83 {
84  vnet_sw_interface_t *sub_sw = vnet_get_sw_interface (vnm, sw_if_index);
85  vnet_sw_interface_t *sup_sw = vnet_get_sup_sw_interface (vnm, sw_if_index);
86  vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
90  ethernet_type_t type;
91  uword n_bytes = sizeof (h[0]);
92  u8 *rewrite = NULL;
93  u8 is_p2p = 0;
94 
95  if ((sub_sw->type == VNET_SW_INTERFACE_TYPE_P2P) ||
96  (sub_sw->type == VNET_SW_INTERFACE_TYPE_PIPE))
97  is_p2p = 1;
98  if (sub_sw != sup_sw)
99  {
100  if (sub_sw->sub.eth.flags.one_tag)
101  {
102  n_bytes += sizeof (ethernet_vlan_header_t);
103  }
104  else if (sub_sw->sub.eth.flags.two_tags)
105  {
106  n_bytes += 2 * (sizeof (ethernet_vlan_header_t));
107  }
108  else if (PREDICT_FALSE (is_p2p))
109  {
110  n_bytes = sizeof (ethernet_header_t);
111  }
112  if (PREDICT_FALSE (!is_p2p))
113  {
114  // Check for encaps that are not supported for L3 interfaces
115  if (!(sub_sw->sub.eth.flags.exact_match) ||
116  (sub_sw->sub.eth.flags.default_sub) ||
117  (sub_sw->sub.eth.flags.outer_vlan_id_any) ||
118  (sub_sw->sub.eth.flags.inner_vlan_id_any))
119  {
120  return 0;
121  }
122  }
123  else
124  {
125  n_bytes = sizeof (ethernet_header_t);
126  }
127  }
128 
129  switch (link_type)
130  {
131 #define _(a,b) case VNET_LINK_##a: type = ETHERNET_TYPE_##b; break
132  _(IP4, IP4);
133  _(IP6, IP6);
134  _(MPLS, MPLS);
135  _(ARP, ARP);
136 #undef _
137  default:
138  return NULL;
139  }
140 
141  vec_validate (rewrite, n_bytes - 1);
142  h = (ethernet_header_t *) rewrite;
143  ei = pool_elt_at_index (em->interfaces, hw->hw_instance);
144  clib_memcpy (h->src_address, ei->address, sizeof (h->src_address));
145  if (is_p2p)
146  {
147  clib_memcpy (h->dst_address, sub_sw->p2p.client_mac,
148  sizeof (h->dst_address));
149  }
150  else
151  {
152  if (dst_address)
153  clib_memcpy (h->dst_address, dst_address, sizeof (h->dst_address));
154  else
155  clib_memset (h->dst_address, ~0, sizeof (h->dst_address)); /* broadcast */
156  }
157 
158  if (PREDICT_FALSE (!is_p2p) && sub_sw->sub.eth.flags.one_tag)
159  {
160  ethernet_vlan_header_t *outer = (void *) (h + 1);
161 
162  h->type = sub_sw->sub.eth.flags.dot1ad ?
163  clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) :
164  clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
165  outer->priority_cfi_and_id =
166  clib_host_to_net_u16 (sub_sw->sub.eth.outer_vlan_id);
167  outer->type = clib_host_to_net_u16 (type);
168 
169  }
170  else if (PREDICT_FALSE (!is_p2p) && sub_sw->sub.eth.flags.two_tags)
171  {
172  ethernet_vlan_header_t *outer = (void *) (h + 1);
173  ethernet_vlan_header_t *inner = (void *) (outer + 1);
174 
175  h->type = sub_sw->sub.eth.flags.dot1ad ?
176  clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) :
177  clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
178  outer->priority_cfi_and_id =
179  clib_host_to_net_u16 (sub_sw->sub.eth.outer_vlan_id);
180  outer->type = clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
181  inner->priority_cfi_and_id =
182  clib_host_to_net_u16 (sub_sw->sub.eth.inner_vlan_id);
183  inner->type = clib_host_to_net_u16 (type);
184 
185  }
186  else
187  {
188  h->type = clib_host_to_net_u16 (type);
189  }
190 
191  return (rewrite);
192 }
193 
194 void
196 {
197  ip_adjacency_t *adj;
198 
199  adj = adj_get (ai);
200 
201  vnet_sw_interface_t *si = vnet_get_sw_interface (vnm, sw_if_index);
202  if ((si->type == VNET_SW_INTERFACE_TYPE_P2P) ||
204  {
205  default_update_adjacency (vnm, sw_if_index, ai);
206  }
207  else if (FIB_PROTOCOL_IP4 == adj->ia_nh_proto)
208  {
209  arp_update_adjacency (vnm, sw_if_index, ai);
210  }
211  else if (FIB_PROTOCOL_IP6 == adj->ia_nh_proto)
212  {
213  ip6_ethernet_update_adjacency (vnm, sw_if_index, ai);
214  }
215  else
216  {
217  ASSERT (0);
218  }
219 }
220 
221 static clib_error_t *
223  const u8 * old_address, const u8 * mac_address)
224 {
226  ethernet_main_t *em;
227 
228  em = &ethernet_main;
229  ei = pool_elt_at_index (em->interfaces, hi->hw_instance);
230 
233  clib_memcpy (hi->hw_address, mac_address, vec_len (hi->hw_address));
234 
235  clib_memcpy (ei->address, (u8 *) mac_address, sizeof (ei->address));
238 
239  return (NULL);
240 }
241 
242 /* *INDENT-OFF* */
244  .name = "Ethernet",
245  .format_address = format_ethernet_address,
246  .format_header = format_ethernet_header_with_length,
247  .unformat_hw_address = unformat_ethernet_address,
248  .unformat_header = unformat_ethernet_header,
249  .build_rewrite = ethernet_build_rewrite,
250  .update_adjacency = ethernet_update_adjacency,
251  .mac_addr_change_function = ethernet_mac_change,
252 };
253 /* *INDENT-ON* */
254 
255 uword
257 {
258  vnet_main_t *vnm = va_arg (*args, vnet_main_t *);
259  u32 *result = va_arg (*args, u32 *);
260  u32 hw_if_index;
263 
264  if (!unformat_user (input, unformat_vnet_hw_interface, vnm, &hw_if_index))
265  return 0;
266 
267  eif = ethernet_get_interface (em, hw_if_index);
268  if (eif)
269  {
270  *result = hw_if_index;
271  return 1;
272  }
273  return 0;
274 }
275 
276 clib_error_t *
278  u32 dev_class_index,
279  u32 dev_instance,
280  u8 * address,
281  u32 * hw_if_index_return,
283 {
287  clib_error_t *error = 0;
288  u32 hw_if_index;
289 
290  pool_get (em->interfaces, ei);
291  ei->flag_change = flag_change;
292 
293  hw_if_index = vnet_register_interface
294  (vnm,
295  dev_class_index, dev_instance,
296  ethernet_hw_interface_class.index, ei - em->interfaces);
297  *hw_if_index_return = hw_if_index;
298 
299  hi = vnet_get_hw_interface (vnm, hw_if_index);
300 
302 
307 
308  /* Standard default ethernet MTU. */
309  vnet_sw_interface_set_mtu (vnm, hi->sw_if_index, 9000);
310 
311  clib_memcpy (ei->address, address, sizeof (ei->address));
312  vec_add (hi->hw_address, address, sizeof (ei->address));
313 
314  if (error)
315  {
316  pool_put (em->interfaces, ei);
317  return error;
318  }
319  return error;
320 }
321 
322 void
324 {
328  main_intf_t *main_intf;
329  vlan_table_t *vlan_table;
330  u32 idx;
331 
332  hi = vnet_get_hw_interface (vnm, hw_if_index);
333  ei = pool_elt_at_index (em->interfaces, hi->hw_instance);
334 
335  /* Delete vlan mapping table for dot1q and dot1ad. */
336  main_intf = vec_elt_at_index (em->main_intfs, hi->hw_if_index);
337  if (main_intf->dot1q_vlans)
338  {
339  vlan_table = vec_elt_at_index (em->vlan_pool, main_intf->dot1q_vlans);
340  for (idx = 0; idx < ETHERNET_N_VLAN; idx++)
341  {
342  if (vlan_table->vlans[idx].qinqs)
343  {
344  pool_put_index (em->qinq_pool, vlan_table->vlans[idx].qinqs);
345  vlan_table->vlans[idx].qinqs = 0;
346  }
347  }
348  pool_put_index (em->vlan_pool, main_intf->dot1q_vlans);
349  main_intf->dot1q_vlans = 0;
350  }
351  if (main_intf->dot1ad_vlans)
352  {
353  vlan_table = vec_elt_at_index (em->vlan_pool, main_intf->dot1ad_vlans);
354  for (idx = 0; idx < ETHERNET_N_VLAN; idx++)
355  {
356  if (vlan_table->vlans[idx].qinqs)
357  {
358  pool_put_index (em->qinq_pool, vlan_table->vlans[idx].qinqs);
359  vlan_table->vlans[idx].qinqs = 0;
360  }
361  }
362  pool_put_index (em->vlan_pool, main_intf->dot1ad_vlans);
363  main_intf->dot1ad_vlans = 0;
364  }
365 
366  vnet_delete_hw_interface (vnm, hw_if_index);
367  pool_put (em->interfaces, ei);
368 }
369 
370 u32
372 {
376 
377  hi = vnet_get_hw_interface (vnm, hw_if_index);
378 
380 
381  ei = pool_elt_at_index (em->interfaces, hi->hw_instance);
382  ei->flags = flags;
383  if (ei->flag_change)
384  return ei->flag_change (vnm, hi, flags);
385  return (u32) ~ 0;
386 }
387 
388 /**
389  * Echo packets back to ethernet/l2-input.
390  */
391 static uword
394  node, vlib_frame_t * frame)
395 {
396  u32 n_left_from, *from;
397  u32 next_index = 0;
398  u32 n_bytes;
399  u32 thread_index = vm->thread_index;
400  vnet_main_t *vnm = vnet_get_main ();
402  l2_input_config_t *config;
403  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
404  u16 nexts[VLIB_FRAME_SIZE], *next;
405  u32 new_rx_sw_if_index = ~0;
406  u32 new_tx_sw_if_index = ~0;
407 
408  n_left_from = frame->n_vectors;
409  from = vlib_frame_vector_args (frame);
410 
411  vlib_get_buffers (vm, from, bufs, n_left_from);
412  b = bufs;
413  next = nexts;
414 
415  /* Ordinarily, this is the only config lookup. */
417  next_index =
420  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
421  new_rx_sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
422 
423  while (n_left_from >= 4)
424  {
425  u32 sw_if_index0, sw_if_index1, sw_if_index2, sw_if_index3;
426  u32 not_all_match_config;
427 
428  /* Prefetch next iteration. */
429  if (PREDICT_TRUE (n_left_from >= 8))
430  {
431  vlib_prefetch_buffer_header (b[4], STORE);
432  vlib_prefetch_buffer_header (b[5], STORE);
433  vlib_prefetch_buffer_header (b[6], STORE);
434  vlib_prefetch_buffer_header (b[7], STORE);
435  }
436 
437  /* Make sure all pkts were transmitted on the same (loop) intfc */
438  sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
439  sw_if_index1 = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
440  sw_if_index2 = vnet_buffer (b[2])->sw_if_index[VLIB_TX];
441  sw_if_index3 = vnet_buffer (b[3])->sw_if_index[VLIB_TX];
442 
443  not_all_match_config = (sw_if_index0 ^ sw_if_index1)
444  ^ (sw_if_index2 ^ sw_if_index3);
445  not_all_match_config += sw_if_index0 ^ new_rx_sw_if_index;
446 
447  /* Speed path / expected case: all pkts on the same intfc */
448  if (PREDICT_TRUE (not_all_match_config == 0))
449  {
450  next[0] = next_index;
451  next[1] = next_index;
452  next[2] = next_index;
453  next[3] = next_index;
454  vnet_buffer (b[0])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
455  vnet_buffer (b[1])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
456  vnet_buffer (b[2])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
457  vnet_buffer (b[3])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
458  vnet_buffer (b[0])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
459  vnet_buffer (b[1])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
460  vnet_buffer (b[2])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
461  vnet_buffer (b[3])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
462  n_bytes = vlib_buffer_length_in_chain (vm, b[0]);
463  n_bytes += vlib_buffer_length_in_chain (vm, b[1]);
464  n_bytes += vlib_buffer_length_in_chain (vm, b[2]);
465  n_bytes += vlib_buffer_length_in_chain (vm, b[3]);
466 
468  {
469  vnet_update_l2_len (b[0]);
470  vnet_update_l2_len (b[1]);
471  vnet_update_l2_len (b[2]);
472  vnet_update_l2_len (b[3]);
473  }
474 
475  /* increment TX interface stat */
478  thread_index, new_rx_sw_if_index,
479  4 /* pkts */ , n_bytes);
480  b += 4;
481  next += 4;
482  n_left_from -= 4;
483  continue;
484  }
485 
486  /*
487  * Slow path: we know that at least one of the pkts
488  * was transmitted on a different sw_if_index, so
489  * check each sw_if_index against the cached data and proceed
490  * accordingly.
491  *
492  * This shouldn't happen, but code can (and does) bypass the
493  * per-interface output node, so deal with it.
494  */
495  if (PREDICT_FALSE (vnet_buffer (b[0])->sw_if_index[VLIB_TX]
496  != new_rx_sw_if_index))
497  {
498  config = l2input_intf_config
499  (vnet_buffer (b[0])->sw_if_index[VLIB_TX]);
500  next_index =
503  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
504  new_rx_sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
505  }
506  next[0] = next_index;
507  vnet_buffer (b[0])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
508  vnet_buffer (b[0])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
509  n_bytes = vlib_buffer_length_in_chain (vm, b[0]);
511  vnet_update_l2_len (b[0]);
512 
515  thread_index, new_rx_sw_if_index,
516  1 /* pkts */ , n_bytes);
517 
518  if (PREDICT_FALSE (vnet_buffer (b[1])->sw_if_index[VLIB_TX]
519  != new_rx_sw_if_index))
520  {
521  config = l2input_intf_config
522  (vnet_buffer (b[1])->sw_if_index[VLIB_TX]);
523  next_index =
526  new_rx_sw_if_index = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
527  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
528  }
529  next[1] = next_index;
530  vnet_buffer (b[1])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
531  vnet_buffer (b[1])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
532  n_bytes = vlib_buffer_length_in_chain (vm, b[1]);
534  vnet_update_l2_len (b[1]);
535 
538  thread_index, new_rx_sw_if_index,
539  1 /* pkts */ , n_bytes);
540 
541  if (PREDICT_FALSE (vnet_buffer (b[2])->sw_if_index[VLIB_TX]
542  != new_rx_sw_if_index))
543  {
544  config = l2input_intf_config
545  (vnet_buffer (b[2])->sw_if_index[VLIB_TX]);
546  next_index =
549  new_rx_sw_if_index = vnet_buffer (b[2])->sw_if_index[VLIB_TX];
550  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
551  }
552  next[2] = next_index;
553  vnet_buffer (b[2])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
554  vnet_buffer (b[2])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
555  n_bytes = vlib_buffer_length_in_chain (vm, b[2]);
557  vnet_update_l2_len (b[2]);
558 
561  thread_index, new_rx_sw_if_index,
562  1 /* pkts */ , n_bytes);
563 
564  if (PREDICT_FALSE (vnet_buffer (b[3])->sw_if_index[VLIB_TX]
565  != new_rx_sw_if_index))
566  {
567  config = l2input_intf_config
568  (vnet_buffer (b[3])->sw_if_index[VLIB_TX]);
569  next_index =
572  new_rx_sw_if_index = vnet_buffer (b[3])->sw_if_index[VLIB_TX];
573  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
574  }
575  next[3] = next_index;
576  vnet_buffer (b[3])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
577  vnet_buffer (b[3])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
578  n_bytes = vlib_buffer_length_in_chain (vm, b[3]);
580  vnet_update_l2_len (b[3]);
581 
584  thread_index, new_rx_sw_if_index,
585  1 /* pkts */ , n_bytes);
586  b += 4;
587  next += 4;
588  n_left_from -= 4;
589  }
590  while (n_left_from > 0)
591  {
592  if (PREDICT_FALSE (vnet_buffer (b[0])->sw_if_index[VLIB_TX]
593  != new_rx_sw_if_index))
594  {
595  config = l2input_intf_config
596  (vnet_buffer (b[0])->sw_if_index[VLIB_TX]);
597  next_index =
600  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
601  new_rx_sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
602  }
603  next[0] = next_index;
604  vnet_buffer (b[0])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
605  vnet_buffer (b[0])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
606  n_bytes = vlib_buffer_length_in_chain (vm, b[0]);
608  vnet_update_l2_len (b[0]);
609 
612  thread_index, new_rx_sw_if_index,
613  1 /* pkts */ , n_bytes);
614  b += 1;
615  next += 1;
616  n_left_from -= 1;
617  }
618 
619  vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
620 
621  return frame->n_vectors;
622 }
623 
624 static u8 *
625 format_simulated_ethernet_name (u8 * s, va_list * args)
626 {
627  u32 dev_instance = va_arg (*args, u32);
628  return format (s, "loop%d", dev_instance);
629 }
630 
631 static clib_error_t *
633  u32 flags)
634 {
635  u32 hw_flags = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) ?
637  vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags);
638  return 0;
639 }
640 
641 static clib_error_t *
643  const u8 * old_address, const u8 * mac_address)
644 {
645  l2input_interface_mac_change (hi->sw_if_index, old_address, mac_address);
646 
647  return (NULL);
648 }
649 
650 
651 /* *INDENT-OFF* */
652 VNET_DEVICE_CLASS (ethernet_simulated_device_class) = {
653  .name = "Loopback",
654  .format_device_name = format_simulated_ethernet_name,
655  .tx_function = simulated_ethernet_interface_tx,
656  .admin_up_down_function = simulated_ethernet_admin_up_down,
657  .mac_addr_change_function = simulated_ethernet_mac_change,
658 };
659 /* *INDENT-ON* */
660 
661 VLIB_DEVICE_TX_FUNCTION_MULTIARCH (ethernet_simulated_device_class,
663 
664 /*
665  * Maintain a bitmap of allocated loopback instance numbers.
666  */
667 #define LOOPBACK_MAX_INSTANCE (16 * 1024)
668 
669 static u32
670 loopback_instance_alloc (u8 is_specified, u32 want)
671 {
673 
674  /*
675  * Check for dynamically allocaetd instance number.
676  */
677  if (!is_specified)
678  {
679  u32 bit;
680 
682  if (bit >= LOOPBACK_MAX_INSTANCE)
683  {
684  return ~0;
685  }
687  bit, 1);
688  return bit;
689  }
690 
691  /*
692  * In range?
693  */
694  if (want >= LOOPBACK_MAX_INSTANCE)
695  {
696  return ~0;
697  }
698 
699  /*
700  * Already in use?
701  */
702  if (clib_bitmap_get (em->bm_loopback_instances, want))
703  {
704  return ~0;
705  }
706 
707  /*
708  * Grant allocation request.
709  */
711  want, 1);
712 
713  return want;
714 }
715 
716 static int
718 {
720 
721  if (instance >= LOOPBACK_MAX_INSTANCE)
722  {
723  return -1;
724  }
725 
726  if (clib_bitmap_get (em->bm_loopback_instances, instance) == 0)
727  {
728  return -1;
729  }
730 
732  instance, 0);
733  return 0;
734 }
735 
736 int
738  u8 is_specified, u32 user_instance)
739 {
740  vnet_main_t *vnm = vnet_get_main ();
742  clib_error_t *error;
743  u32 instance;
744  u8 address[6];
745  u32 hw_if_index;
746  vnet_hw_interface_t *hw_if;
747  u32 slot;
748  int rv = 0;
749 
750  ASSERT (sw_if_indexp);
751 
752  *sw_if_indexp = (u32) ~ 0;
753 
754  clib_memset (address, 0, sizeof (address));
755 
756  /*
757  * Allocate a loopback instance. Either select on dynamically
758  * or try to use the desired user_instance number.
759  */
760  instance = loopback_instance_alloc (is_specified, user_instance);
761  if (instance == ~0)
762  {
763  return VNET_API_ERROR_INVALID_REGISTRATION;
764  }
765 
766  /*
767  * Default MAC address (dead:0000:0000 + instance) is allocated
768  * if zero mac_address is configured. Otherwise, user-configurable MAC
769  * address is programmed on the loopback interface.
770  */
771  if (memcmp (address, mac_address, sizeof (address)))
772  clib_memcpy (address, mac_address, sizeof (address));
773  else
774  {
775  address[0] = 0xde;
776  address[1] = 0xad;
777  address[5] = instance;
778  }
779 
781  (vnm,
782  ethernet_simulated_device_class.index, instance, address, &hw_if_index,
783  /* flag change */ 0);
784 
785  if (error)
786  {
787  rv = VNET_API_ERROR_INVALID_REGISTRATION;
788  clib_error_report (error);
789  return rv;
790  }
791 
792  hw_if = vnet_get_hw_interface (vnm, hw_if_index);
794  (vm, hw_if->tx_node_index,
797 
799  (vm, hw_if->tx_node_index,
802 
803  {
804  vnet_sw_interface_t *si = vnet_get_hw_sw_interface (vnm, hw_if_index);
805  *sw_if_indexp = si->sw_if_index;
806 
807  /* By default don't flood to loopbacks, as packets just keep
808  * coming back ... If this loopback becomes a BVI, we'll change it */
810  }
811 
812  return 0;
813 }
814 
815 static clib_error_t *
817  unformat_input_t * input,
818  vlib_cli_command_t * cmd)
819 {
820  int rv;
822  u8 mac_address[6];
823  u8 is_specified = 0;
824  u32 user_instance = 0;
825 
826  clib_memset (mac_address, 0, sizeof (mac_address));
827 
829  {
830  if (unformat (input, "mac %U", unformat_ethernet_address, mac_address))
831  ;
832  if (unformat (input, "instance %d", &user_instance))
833  is_specified = 1;
834  else
835  break;
836  }
837 
838  rv = vnet_create_loopback_interface (&sw_if_index, mac_address,
839  is_specified, user_instance);
840 
841  if (rv)
842  return clib_error_return (0, "vnet_create_loopback_interface failed");
843 
845  sw_if_index);
846  return 0;
847 }
848 
849 /*?
850  * Create a loopback interface. Optionally, a MAC Address can be
851  * provided. If not provided, de:ad:00:00:00:<loopId> will be used.
852  *
853  * @cliexpar
854  * The following two command syntaxes are equivalent:
855  * @cliexcmd{loopback create-interface [mac <mac-addr>] [instance <instance>]}
856  * @cliexcmd{create loopback interface [mac <mac-addr>] [instance <instance>]}
857  * Example of how to create a loopback interface:
858  * @cliexcmd{loopback create-interface}
859 ?*/
860 /* *INDENT-OFF* */
861 VLIB_CLI_COMMAND (create_simulated_ethernet_interface_command, static) = {
862  .path = "loopback create-interface",
863  .short_help = "loopback create-interface [mac <mac-addr>] [instance <instance>]",
865 };
866 /* *INDENT-ON* */
867 
868 /*?
869  * Create a loopback interface. Optionally, a MAC Address can be
870  * provided. If not provided, de:ad:00:00:00:<loopId> will be used.
871  *
872  * @cliexpar
873  * The following two command syntaxes are equivalent:
874  * @cliexcmd{loopback create-interface [mac <mac-addr>] [instance <instance>]}
875  * @cliexcmd{create loopback interface [mac <mac-addr>] [instance <instance>]}
876  * Example of how to create a loopback interface:
877  * @cliexcmd{create loopback interface}
878 ?*/
879 /* *INDENT-OFF* */
880 VLIB_CLI_COMMAND (create_loopback_interface_command, static) = {
881  .path = "create loopback interface",
882  .short_help = "create loopback interface [mac <mac-addr>] [instance <instance>]",
884 };
885 /* *INDENT-ON* */
886 
889 {
891  vnet_get_hw_interface (vnet_get_main (), hw_if_index);
892  return (i->hw_class_index ==
894  index ? pool_elt_at_index (em->interfaces, i->hw_instance) : 0);
895 }
896 
897 int
899 {
900  vnet_main_t *vnm = vnet_get_main ();
901 
902  if (pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index))
903  return VNET_API_ERROR_INVALID_SW_IF_INDEX;
904 
905  vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
906  if (hw == 0 || hw->dev_class_index != ethernet_simulated_device_class.index)
907  return VNET_API_ERROR_INVALID_SW_IF_INDEX;
908 
909  if (loopback_instance_free (hw->dev_instance) < 0)
910  return VNET_API_ERROR_INVALID_SW_IF_INDEX;
911 
913 
914  return 0;
915 }
916 
917 int
919 {
920  vnet_main_t *vnm = vnet_get_main ();
922  int rv = 0;
923 
924  if (pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index))
925  return VNET_API_ERROR_INVALID_SW_IF_INDEX;
926 
927  si = vnet_get_sw_interface (vnm, sw_if_index);
928  if (si->type == VNET_SW_INTERFACE_TYPE_SUB ||
931  {
933  vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
934  u64 sup_and_sub_key =
935  ((u64) (si->sup_sw_if_index) << 32) | (u64) si->sub.id;
936  hash_unset_mem_free (&im->sw_if_index_by_sup_and_sub, &sup_and_sub_key);
938  vnet_delete_sw_interface (vnm, sw_if_index);
939  }
940  else
941  rv = VNET_API_ERROR_INVALID_SUB_SW_IF_INDEX;
942 
943  return rv;
944 }
945 
946 static clib_error_t *
948  unformat_input_t * input,
949  vlib_cli_command_t * cmd)
950 {
951  int rv;
952  u32 sw_if_index = ~0;
953  vnet_main_t *vnm = vnet_get_main ();
954 
956  {
957  if (unformat (input, "intfc %U",
958  unformat_vnet_sw_interface, vnm, &sw_if_index))
959  ;
960  else
961  break;
962  }
963 
964  if (sw_if_index == ~0)
965  return clib_error_return (0, "interface not specified");
966 
967  rv = vnet_delete_loopback_interface (sw_if_index);
968 
969  if (rv)
970  return clib_error_return (0, "vnet_delete_loopback_interface failed");
971 
972  return 0;
973 }
974 
975 static clib_error_t *
977  unformat_input_t * input, vlib_cli_command_t * cmd)
978 {
979  int rv = 0;
980  u32 sw_if_index = ~0;
981  vnet_main_t *vnm = vnet_get_main ();
982 
984  {
985  if (unformat
986  (input, "%U", unformat_vnet_sw_interface, vnm, &sw_if_index))
987  ;
988  else
989  break;
990  }
991  if (sw_if_index == ~0)
992  return clib_error_return (0, "interface doesn't exist");
993 
994  if (pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index))
995  rv = VNET_API_ERROR_INVALID_SW_IF_INDEX;
996  else
997  rv = vnet_delete_sub_interface (sw_if_index);
998  if (rv)
999  return clib_error_return (0, "delete_subinterface_interface failed");
1000  return 0;
1001 }
1002 
1003 /*?
1004  * Delete a loopback interface.
1005  *
1006  * @cliexpar
1007  * The following two command syntaxes are equivalent:
1008  * @cliexcmd{loopback delete-interface intfc <interface>}
1009  * @cliexcmd{delete loopback interface intfc <interface>}
1010  * Example of how to delete a loopback interface:
1011  * @cliexcmd{loopback delete-interface intfc loop0}
1012 ?*/
1013 /* *INDENT-OFF* */
1014 VLIB_CLI_COMMAND (delete_simulated_ethernet_interface_command, static) = {
1015  .path = "loopback delete-interface",
1016  .short_help = "loopback delete-interface intfc <interface>",
1018 };
1019 /* *INDENT-ON* */
1020 
1021 /*?
1022  * Delete a loopback interface.
1023  *
1024  * @cliexpar
1025  * The following two command syntaxes are equivalent:
1026  * @cliexcmd{loopback delete-interface intfc <interface>}
1027  * @cliexcmd{delete loopback interface intfc <interface>}
1028  * Example of how to delete a loopback interface:
1029  * @cliexcmd{delete loopback interface intfc loop0}
1030 ?*/
1031 /* *INDENT-OFF* */
1032 VLIB_CLI_COMMAND (delete_loopback_interface_command, static) = {
1033  .path = "delete loopback interface",
1034  .short_help = "delete loopback interface intfc <interface>",
1036 };
1037 /* *INDENT-ON* */
1038 
1039 /*?
1040  * Delete a sub-interface.
1041  *
1042  * @cliexpar
1043  * Example of how to delete a sub-interface:
1044  * @cliexcmd{delete sub-interface GigabitEthernet0/8/0.200}
1045 ?*/
1046 /* *INDENT-OFF* */
1047 VLIB_CLI_COMMAND (delete_sub_interface_command, static) = {
1048  .path = "delete sub-interface",
1049  .short_help = "delete sub-interface <interface>",
1050  .function = delete_sub_interface,
1051 };
1052 /* *INDENT-ON* */
1053 
1054 /*
1055  * fd.io coding-style-patch-verification: ON
1056  *
1057  * Local Variables:
1058  * eval: (c-set-style "gnu")
1059  * End:
1060  */
unformat_function_t unformat_vnet_hw_interface
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:439
vmrglw vmrglh hi
int vnet_delete_loopback_interface(u32 sw_if_index)
Definition: interface.c:898
typedef address
Definition: ip_types.api:30
const u8 * ethernet_ip6_mcast_dst_addr(void)
Definition: interface.c:66
u32 flags
Definition: vhost_user.h:115
#define ETHERNET_N_VLAN
Definition: packet.h:133
static clib_error_t * delete_simulated_ethernet_interfaces(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
Definition: interface.c:947
#define hash_unset(h, key)
Definition: hash.h:261
static void vlib_increment_combined_counter(vlib_combined_counter_main_t *cm, u32 thread_index, u32 index, u64 n_packets, u64 n_bytes)
Increment a combined counter.
Definition: counter.h:220
vnet_main_t * vnet_get_main(void)
Definition: misc.c:47
static vnet_hw_interface_t * vnet_get_sup_hw_interface(vnet_main_t *vnm, u32 sw_if_index)
vnet_interface_main_t interface_main
Definition: vnet.h:56
uword vlib_node_add_named_next_with_slot(vlib_main_t *vm, uword node, char *name, uword slot)
Definition: node.c:262
vnet_p2p_sub_interface_t p2p
Definition: interface.h:729
#define PREDICT_TRUE(x)
Definition: clib.h:112
unsigned long u64
Definition: types.h:89
l2_input_config_t * l2input_intf_config(u32 sw_if_index)
Get a pointer to the config for the given interface.
Definition: l2_input.c:520
#define NULL
Definition: clib.h:58
clib_memset(h->entries, 0, sizeof(h->entries[0]) *entries)
ethernet_type_t
Definition: packet.h:45
IP unicast adjacency.
Definition: adj.h:221
u8 src_address[6]
Definition: packet.h:56
static vnet_hw_interface_t * vnet_get_hw_interface(vnet_main_t *vnm, u32 hw_if_index)
u32 thread_index
Definition: main.h:179
void arp_update_adjacency(vnet_main_t *vnm, u32 sw_if_index, u32 ai)
Definition: arp.c:447
int i
int vnet_delete_sub_interface(u32 sw_if_index)
Definition: interface.c:918
static uword * clib_bitmap_set(uword *ai, uword i, uword value)
Sets the ith bit of a bitmap to new_value Removes trailing zeros from the bitmap. ...
Definition: bitmap.h:167
uword unformat_user(unformat_input_t *input, unformat_function_t *func,...)
Definition: unformat.c:983
main_intf_t * main_intfs
Definition: ethernet.h:314
static vnet_sw_interface_t * vnet_get_sw_interface(vnet_main_t *vnm, u32 sw_if_index)
uword * sub_interface_sw_if_index_by_id
Definition: interface.h:564
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
VLIB_DEVICE_TX_FUNCTION_MULTIARCH(ethernet_simulated_device_class, simulated_ethernet_interface_tx)
unformat_function_t unformat_vnet_sw_interface
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:267
#define pool_get(P, E)
Allocate an object E from a pool P (unspecified alignment).
Definition: pool.h:236
format_function_t format_vnet_sw_if_index_name
unsigned char u8
Definition: types.h:56
#define VNET_SIMULATED_ETHERNET_TX_NEXT_L2_INPUT
static vnet_sw_interface_t * vnet_get_hw_sw_interface(vnet_main_t *vnm, u32 hw_if_index)
#define clib_memcpy(d, s, n)
Definition: string.h:180
#define vec_add(V, E, N)
Add N elements to end of vector V (no header, unspecified alignment)
Definition: vec.h:602
struct vnet_sub_interface_t::@198::@199::@201 flags
ethernet_main_t ethernet_main
Definition: init.c:45
static ip_adjacency_t * adj_get(adj_index_t adj_index)
Get a pointer to an adjacency object from its index.
Definition: adj.h:433
vnet_flood_class_t flood_class
Definition: interface.h:731
void default_update_adjacency(vnet_main_t *vnm, u32 sw_if_index, u32 ai)
Default adjacency update function.
Definition: interface.c:1559
u8 * format_ethernet_address(u8 *s, va_list *args)
Definition: format.c:44
u32 sw_if_index
Definition: vxlan_gbp.api:37
void ip6_ethernet_update_adjacency(vnet_main_t *vnm, u32 sw_if_index, u32 ai)
Definition: ip6_neighbor.c:624
vlib_combined_counter_main_t * combined_sw_if_counters
Definition: interface.h:839
u8 dst_address[6]
Definition: packet.h:55
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:188
#define vec_elt_at_index(v, i)
Get vector value at index i checking that i is in bounds.
static vnet_sw_interface_t * vnet_get_sup_sw_interface(vnet_main_t *vnm, u32 sw_if_index)
#define clib_error_return(e, args...)
Definition: error.h:99
ethernet_flag_change_function_t * flag_change
Definition: ethernet.h:184
static clib_error_t * simulated_ethernet_admin_up_down(vnet_main_t *vnm, u32 hw_if_index, u32 flags)
Definition: interface.c:632
unsigned int u32
Definition: types.h:88
u32 vnet_register_interface(vnet_main_t *vnm, u32 dev_class_index, u32 dev_instance, u32 hw_class_index, u32 hw_instance)
Definition: interface.c:740
#define VLIB_FRAME_SIZE
Definition: node.h:401
u32 max_supported_packet_bytes
Definition: interface.h:555
u16 dot1q_vlans
Definition: ethernet.h:248
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:511
static clib_error_t * ethernet_mac_change(vnet_hw_interface_t *hi, const u8 *old_address, const u8 *mac_address)
Definition: interface.c:222
vnet_sub_interface_t sub
Definition: interface.h:726
vlib_main_t * vlib_main
Definition: vnet.h:80
static u32 loopback_instance_alloc(u8 is_specified, u32 want)
Definition: interface.c:670
#define LOOPBACK_MAX_INSTANCE
Definition: interface.c:667
struct _unformat_input_t unformat_input_t
unsigned short u16
Definition: types.h:57
#define pool_put(P, E)
Free an object E in pool P.
Definition: pool.h:286
uword * sw_if_index_by_sup_and_sub
Definition: interface.h:833
static int loopback_instance_free(u32 instance)
Definition: interface.c:717
#define PREDICT_FALSE(x)
Definition: clib.h:111
vl_api_address_union_t src_address
Definition: ip_types.api:44
u16 dot1ad_vlans
Definition: ethernet.h:249
#define L2INPUT_BVI
Definition: l2_input.h:96
vnet_hw_interface_class_t ethernet_hw_interface_class
uword unformat_ethernet_interface(unformat_input_t *input, va_list *args)
Definition: interface.c:256
static clib_error_t * create_simulated_ethernet_interfaces(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
Definition: interface.c:816
u8 * format_ethernet_header_with_length(u8 *s, va_list *args)
Definition: format.c:97
VNET_HW_INTERFACE_CLASS(ethernet_hw_interface_class)
#define UNFORMAT_END_OF_INPUT
Definition: format.h:144
u16 n_vectors
Definition: node.h:420
vlib_main_t * vm
Definition: buffer.c:301
static_always_inline void vlib_buffer_enqueue_to_next(vlib_main_t *vm, vlib_node_runtime_t *node, u32 *buffers, u16 *nexts, uword count)
Definition: buffer_node.h:332
struct vnet_sub_interface_t::@198 eth
#define VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT
#define pool_is_free_index(P, I)
Use free bitmap to query whether given index is free.
Definition: pool.h:283
const u8 * ethernet_ip4_mcast_dst_addr(void)
Definition: interface.c:56
static uword clib_bitmap_get(uword *ai, uword i)
Gets the ith bit value from a bitmap.
Definition: bitmap.h:197
int vnet_create_loopback_interface(u32 *sw_if_indexp, u8 *mac_address, u8 is_specified, u32 user_instance)
Definition: interface.c:737
#define VLIB_CLI_COMMAND(x,...)
Definition: cli.h:155
static u8 * format_simulated_ethernet_name(u8 *s, va_list *args)
Definition: interface.c:625
void ethernet_delete_interface(vnet_main_t *vnm, u32 hw_if_index)
Definition: interface.c:323
static uword simulated_ethernet_interface_tx(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Echo packets back to ethernet/l2-input.
Definition: interface.c:392
uword unformat_ethernet_address(unformat_input_t *input, va_list *args)
Definition: format.c:233
#define pool_put_index(p, i)
Free pool element with given index.
Definition: pool.h:311
vlan_table_t * vlan_pool
Definition: ethernet.h:317
#define ASSERT(truth)
void ethernet_ndp_change_mac(u32 sw_if_index)
u32() ethernet_flag_change_function_t(vnet_main_t *vnm, struct vnet_hw_interface_t *hi, u32 flags)
Definition: ethernet.h:163
clib_error_t * ethernet_register_interface(vnet_main_t *vnm, u32 dev_class_index, u32 dev_instance, u8 *address, u32 *hw_if_index_return, ethernet_flag_change_function_t flag_change)
Definition: interface.c:277
enum vnet_link_t_ vnet_link_t
Link Type: A description of the protocol of packets on the link.
#define clib_error_report(e)
Definition: error.h:113
vlan_intf_t vlans[ETHERNET_N_VLAN]
Definition: ethernet.h:261
uword * bm_loopback_instances
Definition: ethernet.h:332
u8 mac_address[6]
static vlib_main_t * vlib_get_main(void)
Definition: global_funcs.h:23
void vnet_delete_hw_interface(vnet_main_t *vnm, u32 hw_if_index)
Definition: interface.c:950
fib_protocol_t ia_nh_proto
The protocol of the neighbor/peer.
Definition: adj.h:249
Definition: defs.h:47
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
static void vnet_update_l2_len(vlib_buffer_t *b)
Definition: l2_input.h:226
void l2input_interface_mac_change(u32 sw_if_index, const u8 *old_address, const u8 *new_address)
Definition: l2_input.c:554
clib_error_t * vnet_hw_interface_set_flags(vnet_main_t *vnm, u32 hw_if_index, vnet_hw_interface_flags_t flags)
Definition: interface.c:504
u64 uword
Definition: types.h:112
vnet_sw_interface_t * sw_interfaces
Definition: interface.h:830
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:244
u32 ethernet_set_flags(vnet_main_t *vnm, u32 hw_if_index, u32 flags)
Definition: interface.c:371
u8 * ethernet_build_rewrite(vnet_main_t *vnm, u32 sw_if_index, vnet_link_t link_type, const void *dst_address)
build a rewrite string to use for sending packets of type &#39;link_type&#39; to &#39;dst_address&#39; ...
Definition: interface.c:80
void vnet_sw_interface_set_mtu(vnet_main_t *vnm, u32 sw_if_index, u32 mtu)
Definition: interface.c:642
Definition: lisp_types.h:37
static void hash_unset_mem_free(uword **h, void *key)
Definition: hash.h:295
#define vnet_buffer(b)
Definition: buffer.h:368
u32 min_supported_packet_bytes
Definition: interface.h:552
vnet_sw_interface_type_t type
Definition: interface.h:704
qinq_table_t * qinq_pool
Definition: ethernet.h:320
#define STRUCT_SIZE_OF(t, f)
Definition: clib.h:67
#define ETHERNET_MAX_PACKET_BYTES
Definition: ethernet.h:166
void vnet_delete_sw_interface(vnet_main_t *vnm, u32 sw_if_index)
Definition: interface.c:604
ethernet_interface_t * ethernet_get_interface(ethernet_main_t *em, u32 hw_if_index)
Definition: interface.c:888
VNET_DEVICE_CLASS(ethernet_simulated_device_class)
static_always_inline void vlib_get_buffers(vlib_main_t *vm, u32 *bi, vlib_buffer_t **b, int count)
Translate array of buffer indices into buffer pointers.
Definition: buffer_funcs.h:145
static uword clib_bitmap_first_clear(uword *ai)
Return the lowest numbered clear bit in a bitmap.
Definition: bitmap.h:445
Definition: lisp_types.h:38
ethernet_interface_t * interfaces
Definition: ethernet.h:305
#define ETHERNET_MIN_PACKET_BYTES
Definition: ethernet.h:165
void ethernet_arp_change_mac(u32 sw_if_index)
Definition: arp.c:2534
void vlib_cli_output(vlib_main_t *vm, char *fmt,...)
Definition: cli.c:762
void ethernet_update_adjacency(vnet_main_t *vnm, u32 sw_if_index, u32 ai)
Definition: interface.c:195
static clib_error_t * delete_sub_interface(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
Definition: interface.c:976
static clib_error_t * simulated_ethernet_mac_change(vnet_hw_interface_t *hi, const u8 *old_address, const u8 *mac_address)
Definition: interface.c:642
static void ethernet_setup_node(vlib_main_t *vm, u32 node_index)
Definition: ethernet.h:398
uword unformat(unformat_input_t *i, const char *fmt,...)
Definition: unformat.c:972
Definition: defs.h:46
uword unformat_ethernet_header(unformat_input_t *input, va_list *args)
Definition: format.c:290
static uword unformat_check_input(unformat_input_t *i)
Definition: format.h:170