FD.io VPP  v19.04.4-rc0-5-ge88582fac
Vector Packet Processing
dhcp4_proxy_node.c
Go to the documentation of this file.
1 /*
2  * proxy_node.c: dhcp proxy node processing
3  *
4  * Copyright (c) 2013 Cisco and/or its affiliates.
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at:
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 #include <vlib/vlib.h>
19 #include <vnet/pg/pg.h>
20 #include <vnet/dhcp/dhcp_proxy.h>
21 #include <vnet/dhcp/client.h>
22 #include <vnet/fib/ip4_fib.h>
23 
24 static char *dhcp_proxy_error_strings[] = {
25 #define dhcp_proxy_error(n,s) s,
27 #undef dhcp_proxy_error
28 };
29 
30 #define foreach_dhcp_proxy_to_server_input_next \
31  _ (DROP, "error-drop") \
32  _ (LOOKUP, "ip4-lookup") \
33  _ (SEND_TO_CLIENT, "dhcp-proxy-to-client")
34 
35 typedef enum
36 {
37 #define _(s,n) DHCP_PROXY_TO_SERVER_INPUT_NEXT_##s,
39 #undef _
42 
43 typedef struct
44 {
45  /* 0 => to server, 1 => to client */
46  int which;
52 
53 #define VPP_DHCP_OPTION82_SUB1_SIZE 6
54 #define VPP_DHCP_OPTION82_SUB5_SIZE 6
55 #define VPP_DHCP_OPTION82_VSS_SIZE 12
56 #define VPP_DHCP_OPTION82_SIZE (VPP_DHCP_OPTION82_SUB1_SIZE + \
57  VPP_DHCP_OPTION82_SUB5_SIZE + \
58  VPP_DHCP_OPTION82_VSS_SIZE +3)
59 
62 
63 static u8 *
64 format_dhcp_proxy_trace (u8 * s, va_list * args)
65 {
66  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
67  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
68  dhcp_proxy_trace_t *t = va_arg (*args, dhcp_proxy_trace_t *);
69 
70  if (t->which == 0)
71  s = format (s, "DHCP proxy: sent to server %U\n",
73  else
74  s = format (s, "DHCP proxy: broadcast to client from %U\n",
76 
77  if (t->error != (u32) ~ 0)
78  s = format (s, " error: %s\n", dhcp_proxy_error_strings[t->error]);
79 
80  s = format (s, " original_sw_if_index: %d, sw_if_index: %d\n",
82 
83  return s;
84 }
85 
86 static u8 *
88 {
89  dhcp_header_t *h = va_arg (*args, dhcp_header_t *);
90  u32 max_header_bytes = va_arg (*args, u32);
91  u32 header_bytes;
92 
93  header_bytes = sizeof (h[0]);
94  if (max_header_bytes != 0 && header_bytes > max_header_bytes)
95  return format (s, "dhcp header truncated");
96 
97  s = format (s, "DHCP Proxy");
98 
99  return s;
100 }
101 
102 static uword
104  vlib_node_runtime_t * node,
105  vlib_frame_t * from_frame)
106 {
107  u32 n_left_from, next_index, *from, *to_next;
109  from = vlib_frame_vector_args (from_frame);
110  n_left_from = from_frame->n_vectors;
111  u32 pkts_to_server = 0, pkts_to_client = 0, pkts_no_server = 0;
112  u32 pkts_no_interface_address = 0;
113  u32 pkts_too_big = 0;
114  ip4_main_t *im = &ip4_main;
115 
116  next_index = node->cached_next_index;
117 
118  while (n_left_from > 0)
119  {
120  u32 n_left_to_next;
121 
122  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
123 
124  while (n_left_from > 0 && n_left_to_next > 0)
125  {
126  u32 bi0;
127  vlib_buffer_t *b0;
128  udp_header_t *u0;
129  dhcp_header_t *h0;
130  ip4_header_t *ip0;
131  u32 next0;
132  u32 old0, new0;
133  ip_csum_t sum0;
134  u32 error0 = (u32) ~ 0;
135  u32 sw_if_index = 0;
136  u32 original_sw_if_index = 0;
137  u32 fib_index;
138  dhcp_proxy_t *proxy;
139  dhcp_server_t *server;
140  u32 rx_sw_if_index;
141  dhcp_option_t *o, *end;
142  u32 len = 0;
143  u8 is_discover = 0;
144  int space_left;
145 
146  bi0 = from[0];
147  from += 1;
148  n_left_from -= 1;
149 
150  b0 = vlib_get_buffer (vm, bi0);
151 
152  h0 = vlib_buffer_get_current (b0);
153 
154  /*
155  * udp_local hands us the DHCP header, need udp hdr,
156  * ip hdr to relay to server
157  */
158  vlib_buffer_advance (b0, -(sizeof (*u0)));
159  u0 = vlib_buffer_get_current (b0);
160 
161  /* This blows. Return traffic has src_port = 67, dst_port = 67 */
162  if (u0->src_port ==
163  clib_net_to_host_u16 (UDP_DST_PORT_dhcp_to_server))
164  {
165  vlib_buffer_advance (b0, sizeof (*u0));
166  next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_SEND_TO_CLIENT;
167  error0 = 0;
168  pkts_to_client++;
169  goto do_enqueue;
170  }
171 
172  rx_sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
173  fib_index = im->fib_index_by_sw_if_index[rx_sw_if_index];
174  proxy = dhcp_get_proxy (dpm, fib_index, FIB_PROTOCOL_IP4);
175 
176  if (PREDICT_FALSE (NULL == proxy))
177  {
178  error0 = DHCP_PROXY_ERROR_NO_SERVER;
179  next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
180  pkts_no_server++;
181  goto do_trace;
182  }
183 
184  if (!vlib_buffer_chain_linearize (vm, b0))
185  {
186  error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG;
187  next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
188  pkts_too_big++;
189  goto do_trace;
190  }
191  space_left = vlib_buffer_space_left_at_end (vm, b0);
192  /* cant parse chains...
193  * and we need some space for option 82*/
194  if ((b0->flags & VLIB_BUFFER_NEXT_PRESENT) != 0 ||
195  space_left < VPP_DHCP_OPTION82_SIZE)
196  {
197  error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG;
198  next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
199  pkts_too_big++;
200  goto do_trace;
201  }
202 
203  server = &proxy->dhcp_servers[0];
204  vlib_buffer_advance (b0, -(sizeof (*ip0)));
205  ip0 = vlib_buffer_get_current (b0);
206 
207  /* disable UDP checksum */
208  u0->checksum = 0;
209  sum0 = ip0->checksum;
210  old0 = ip0->dst_address.as_u32;
211  new0 = server->dhcp_server.ip4.as_u32;
212  ip0->dst_address.as_u32 = server->dhcp_server.ip4.as_u32;
213  sum0 = ip_csum_update (sum0, old0, new0,
214  ip4_header_t /* structure */ ,
215  dst_address /* changed member */ );
216  ip0->checksum = ip_csum_fold (sum0);
217 
218  sum0 = ip0->checksum;
219  old0 = ip0->src_address.as_u32;
220  new0 = proxy->dhcp_src_address.ip4.as_u32;
221  ip0->src_address.as_u32 = new0;
222  sum0 = ip_csum_update (sum0, old0, new0,
223  ip4_header_t /* structure */ ,
224  src_address /* changed member */ );
225  ip0->checksum = ip_csum_fold (sum0);
226 
227  /* Send to DHCP server via the configured FIB */
228  vnet_buffer (b0)->sw_if_index[VLIB_TX] = server->server_fib_index;
229 
230  h0->gateway_ip_address = proxy->dhcp_src_address.ip4;
231  pkts_to_server++;
232 
233  o = h0->options;
234  end = (void *) vlib_buffer_get_tail (b0);
235 
236  /* TLVs are not performance-friendly... */
237  while (o->option != DHCP_PACKET_OPTION_END && o < end)
238  {
240  {
241  if (DHCP_PACKET_DISCOVER == o->data[0])
242  {
243  is_discover = 1;
244  }
245  }
246  o = (dhcp_option_t *) (o->data + o->length);
247  }
248 
249  if (o->option == DHCP_PACKET_OPTION_END && o <= end)
250  {
251  vnet_main_t *vnm = vnet_get_main ();
252  u16 old_l0, new_l0;
253  ip4_address_t _ia0, *ia0 = &_ia0;
254  dhcp_vss_t *vss;
255  vnet_sw_interface_t *swif;
256 
257  original_sw_if_index = sw_if_index =
258  vnet_buffer (b0)->sw_if_index[VLIB_RX];
259  swif = vnet_get_sw_interface (vnm, sw_if_index);
261  sw_if_index = swif->unnumbered_sw_if_index;
262 
263  /*
264  * Get the first ip4 address on the [client-side]
265  * RX interface, if not unnumbered. otherwise use
266  * the loopback interface's ip address.
267  */
268  ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
269 
270  if (ia0 == 0)
271  {
272  error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS;
273  next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
274  pkts_no_interface_address++;
275  goto do_trace;
276  }
277 
278  /* Add option 82 */
279  o->option = 82; /* option 82 */
280  o->length = 12; /* 12 octets to follow */
281  o->data[0] = 1; /* suboption 1, circuit ID (=FIB id) */
282  o->data[1] = 4; /* length of suboption */
283  u32 *o_ifid = (u32 *) & o->data[2];
284  *o_ifid = clib_host_to_net_u32 (original_sw_if_index);
285  o->data[6] = 5; /* suboption 5 (client RX intfc address) */
286  o->data[7] = 4; /* length 4 */
287  u32 *o_addr = (u32 *) & o->data[8];
288  *o_addr = ia0->as_u32;
289  o->data[12] = DHCP_PACKET_OPTION_END;
290 
291  vss = dhcp_get_vss_info (dpm, fib_index, FIB_PROTOCOL_IP4);
292  if (vss)
293  {
294  u32 id_len; /* length of VPN ID */
295 
296  if (vss->vss_type == VSS_TYPE_VPN_ID)
297  {
298  id_len = sizeof (vss->vpn_id); /* vpn_id is 7 bytes */
299  memcpy (&o->data[15], vss->vpn_id, id_len);
300  }
301  else if (vss->vss_type == VSS_TYPE_ASCII)
302  {
303  id_len = vec_len (vss->vpn_ascii_id);
304  memcpy (&o->data[15], vss->vpn_ascii_id, id_len);
305  }
306  else /* must be VSS_TYPE_DEFAULT, no VPN ID */
307  id_len = 0;
308 
309  o->data[12] = 151; /* vss suboption */
310  o->data[13] = id_len + 1; /* length: vss_type + id_len */
311  o->data[14] = vss->vss_type; /* vss option type */
312  o->data[15 + id_len] = 152; /* vss control suboption */
313  o->data[16 + id_len] = 0; /* length */
314  o->data[17 + id_len] = DHCP_PACKET_OPTION_END; /* "end-of-options" (0xFF) */
315  /* 5 bytes for suboption headers 151+len, 152+len and 0xFF */
316  o->length += id_len + 5;
317  }
318 
319  len = o->length + 3;
320  b0->current_length += len;
321  /* Fix IP header length and checksum */
322  old_l0 = ip0->length;
323  new_l0 = clib_net_to_host_u16 (old_l0);
324  new_l0 += len;
325  new_l0 = clib_host_to_net_u16 (new_l0);
326  ip0->length = new_l0;
327  sum0 = ip0->checksum;
328  sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
329  length /* changed member */ );
330  ip0->checksum = ip_csum_fold (sum0);
331 
332  /* Fix UDP length */
333  new_l0 = clib_net_to_host_u16 (u0->length);
334  new_l0 += len;
335  u0->length = clib_host_to_net_u16 (new_l0);
336  }
337  else
338  {
340  (vm, dhcp_proxy_to_server_node.index,
341  DHCP_PROXY_ERROR_OPTION_82_ERROR, 1);
342  }
343 
344  next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP;
345 
346  /*
347  * If we have multiple servers configured and this is the
348  * client's discover message, then send copies to each of
349  * those servers
350  */
351  if (is_discover && vec_len (proxy->dhcp_servers) > 1)
352  {
353  u32 ii;
354 
355  for (ii = 1; ii < vec_len (proxy->dhcp_servers); ii++)
356  {
357  vlib_buffer_t *c0;
358  u32 ci0;
359 
360  c0 = vlib_buffer_copy (vm, b0);
362  ci0 = vlib_get_buffer_index (vm, c0);
363  server = &proxy->dhcp_servers[ii];
364 
365  ip0 = vlib_buffer_get_current (c0);
366 
367  sum0 = ip0->checksum;
368  old0 = ip0->dst_address.as_u32;
369  new0 = server->dhcp_server.ip4.as_u32;
370  ip0->dst_address.as_u32 = server->dhcp_server.ip4.as_u32;
371  sum0 = ip_csum_update (sum0, old0, new0,
372  ip4_header_t /* structure */ ,
373  dst_address /* changed member */ );
374  ip0->checksum = ip_csum_fold (sum0);
375 
376  to_next[0] = ci0;
377  to_next += 1;
378  n_left_to_next -= 1;
379 
380  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
381  to_next, n_left_to_next,
382  ci0, next0);
383 
384  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
385  {
386  dhcp_proxy_trace_t *tr;
387 
388  vlib_buffer_copy_trace_flag (vm, b0, ci0);
389  tr = vlib_add_trace (vm, node, c0, sizeof (*tr));
390  tr->which = 0; /* to server */
391  tr->error = error0;
392  tr->original_sw_if_index = original_sw_if_index;
393  tr->sw_if_index = sw_if_index;
394  if (next0 == DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
396  server->dhcp_server.ip4.as_u32;
397  }
398 
399  if (PREDICT_FALSE (0 == n_left_to_next))
400  {
401  vlib_put_next_frame (vm, node, next_index,
402  n_left_to_next);
403  vlib_get_next_frame (vm, node, next_index,
404  to_next, n_left_to_next);
405  }
406  }
407  }
408  do_trace:
409  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
410  {
411  dhcp_proxy_trace_t *tr = vlib_add_trace (vm, node,
412  b0, sizeof (*tr));
413  tr->which = 0; /* to server */
414  tr->error = error0;
415  tr->original_sw_if_index = original_sw_if_index;
416  tr->sw_if_index = sw_if_index;
417  if (next0 == DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
419  proxy->dhcp_servers[0].dhcp_server.ip4.as_u32;
420  }
421 
422  do_enqueue:
423  to_next[0] = bi0;
424  to_next += 1;
425  n_left_to_next -= 1;
426 
427  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
428  to_next, n_left_to_next,
429  bi0, next0);
430  }
431 
432  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
433  }
435  DHCP_PROXY_ERROR_RELAY_TO_CLIENT,
436  pkts_to_client);
438  DHCP_PROXY_ERROR_RELAY_TO_SERVER,
439  pkts_to_server);
441  DHCP_PROXY_ERROR_NO_SERVER, pkts_no_server);
443  DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS,
444  pkts_no_interface_address);
446  DHCP_PROXY_ERROR_PKT_TOO_BIG, pkts_too_big);
447  return from_frame->n_vectors;
448 }
449 
450 /* *INDENT-OFF* */
452  .function = dhcp_proxy_to_server_input,
453  .name = "dhcp-proxy-to-server",
454  /* Takes a vector of packets. */
455  .vector_size = sizeof (u32),
456 
457  .n_errors = DHCP_PROXY_N_ERROR,
458  .error_strings = dhcp_proxy_error_strings,
459 
460  .n_next_nodes = DHCP_PROXY_TO_SERVER_INPUT_N_NEXT,
461  .next_nodes = {
462 #define _(s,n) [DHCP_PROXY_TO_SERVER_INPUT_NEXT_##s] = n,
464 #undef _
465  },
466 
467  .format_buffer = format_dhcp_proxy_header_with_length,
468  .format_trace = format_dhcp_proxy_trace,
469 #if 0
470  .unformat_buffer = unformat_dhcp_proxy_header,
471 #endif
472 };
473 /* *INDENT-ON* */
474 
475 static uword
477  vlib_node_runtime_t * node,
478  vlib_frame_t * from_frame)
479 {
480  u32 n_left_from, *from;
483  vnet_main_t *vnm = vnet_get_main ();
484  ip4_main_t *im = &ip4_main;
485 
486  from = vlib_frame_vector_args (from_frame);
487  n_left_from = from_frame->n_vectors;
488 
489  while (n_left_from > 0)
490  {
491  u32 bi0;
492  vlib_buffer_t *b0;
493  udp_header_t *u0;
494  dhcp_header_t *h0;
495  ip4_header_t *ip0 = 0;
496  ip4_address_t *ia0 = 0;
497  u32 old0, new0;
498  ip_csum_t sum0;
500  ethernet_header_t *mac0;
501  vnet_hw_interface_t *hi0;
502  vlib_frame_t *f0;
503  u32 *to_next0;
504  u32 sw_if_index = ~0;
505  vnet_sw_interface_t *si0;
506  u32 error0 = (u32) ~ 0;
507  vnet_sw_interface_t *swif;
508  u32 fib_index;
509  dhcp_proxy_t *proxy;
510  dhcp_server_t *server;
511  u32 original_sw_if_index = (u32) ~ 0;
512  ip4_address_t relay_addr = {
513  .as_u32 = 0,
514  };
515 
516  bi0 = from[0];
517  from += 1;
518  n_left_from -= 1;
519 
520  b0 = vlib_get_buffer (vm, bi0);
521  h0 = vlib_buffer_get_current (b0);
522 
523  /*
524  * udp_local hands us the DHCP header, need udp hdr,
525  * ip hdr to relay to client
526  */
527  vlib_buffer_advance (b0, -(sizeof (*u0)));
528  u0 = vlib_buffer_get_current (b0);
529 
530  vlib_buffer_advance (b0, -(sizeof (*ip0)));
531  ip0 = vlib_buffer_get_current (b0);
532 
533  /* Consumed by dhcp client code? */
534  if (dhcp_client_for_us (bi0, b0, ip0, u0, h0))
535  continue;
536 
537  if (1 /* dpm->insert_option_82 */ )
538  {
539  /* linearize needed to "unclone" and scan options */
540  int rv = vlib_buffer_chain_linearize (vm, b0);
541  if ((b0->flags & VLIB_BUFFER_NEXT_PRESENT) != 0 || !rv)
542  {
543  error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG;
544  goto drop_packet;
545  }
546 
547  dhcp_option_t *o = h0->options, *end =
548  (void *) vlib_buffer_get_tail (b0);
549 
550  /* Parse through TLVs looking for option 82.
551  The circuit-ID is the FIB number we need
552  to track down the client-facing interface */
553 
554  while (o->option != DHCP_PACKET_OPTION_END && o < end)
555  {
556  if (o->option == 82)
557  {
558  u32 vss_exist = 0;
559  u32 vss_ctrl = 0;
560  dhcp_option_t *sub = (dhcp_option_t *) & o->data[0];
561  dhcp_option_t *subend =
562  (dhcp_option_t *) (o->data + o->length);
563  while (sub->option != DHCP_PACKET_OPTION_END
564  && sub < subend)
565  {
566  /* If this is one of ours, it will have
567  total length 12, circuit-id suboption type,
568  and the sw_if_index */
569  if (sub->option == 1 && sub->length == 4)
570  {
571  sw_if_index = ((sub->data[0] << 24) |
572  (sub->data[1] << 16) |
573  (sub->data[2] << 8) |
574  (sub->data[3]));
575  }
576  else if (sub->option == 5 && sub->length == 4)
577  {
578  relay_addr.as_u8[0] = sub->data[0];
579  relay_addr.as_u8[1] = sub->data[1];
580  relay_addr.as_u8[2] = sub->data[2];
581  relay_addr.as_u8[3] = sub->data[3];
582  }
583  else if (sub->option == 151 &&
584  sub->length == 7 && sub->data[0] == 1)
585  vss_exist = 1;
586  else if (sub->option == 152 && sub->length == 0)
587  vss_ctrl = 1;
588  sub = (dhcp_option_t *) (sub->data + sub->length);
589  }
590  if (vss_ctrl && vss_exist)
592  (vm, dhcp_proxy_to_client_node.index,
593  DHCP_PROXY_ERROR_OPTION_82_VSS_NOT_PROCESSED, 1);
594 
595  }
596  o = (dhcp_option_t *) (o->data + o->length);
597  }
598  }
599 
600  if (sw_if_index == (u32) ~ 0)
601  {
602  error0 = DHCP_PROXY_ERROR_NO_OPTION_82;
603 
604  drop_packet:
606  error0, 1);
608  to_next0 = vlib_frame_vector_args (f0);
609  to_next0[0] = bi0;
610  f0->n_vectors = 1;
612  goto do_trace;
613  }
614 
615  if (relay_addr.as_u32 == 0)
616  {
617  error0 = DHCP_PROXY_ERROR_BAD_OPTION_82_ADDR;
618  goto drop_packet;
619  }
620 
621  if (sw_if_index >= vec_len (im->fib_index_by_sw_if_index))
622  {
623  error0 = DHCP_PROXY_ERROR_BAD_OPTION_82_ITF;
624  goto drop_packet;
625  }
626 
627  fib_index = im->fib_index_by_sw_if_index[sw_if_index];
628  proxy = dhcp_get_proxy (dpm, fib_index, FIB_PROTOCOL_IP4);
629 
630  if (PREDICT_FALSE (NULL == proxy))
631  {
632  error0 = DHCP_PROXY_ERROR_NO_SERVER;
633  goto drop_packet;
634  }
635 
636  vec_foreach (server, proxy->dhcp_servers)
637  {
638  if (ip0->src_address.as_u32 == server->dhcp_server.ip4.as_u32)
639  {
640  goto server_found;
641  }
642  }
643 
644  error0 = DHCP_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS;
645  goto drop_packet;
646 
647  server_found:
648  vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index;
649 
650  swif = vnet_get_sw_interface (vnm, sw_if_index);
651  original_sw_if_index = sw_if_index;
653  sw_if_index = swif->unnumbered_sw_if_index;
654 
655  ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
656  if (ia0 == 0)
657  {
658  error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS;
659  goto drop_packet;
660  }
661 
662  if (relay_addr.as_u32 != ia0->as_u32)
663  {
664  error0 = DHCP_PROXY_ERROR_BAD_YIADDR;
665  goto drop_packet;
666  }
667 
668  u0->checksum = 0;
669  u0->dst_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcp_to_client);
670  sum0 = ip0->checksum;
671  old0 = ip0->dst_address.as_u32;
672  new0 = 0xFFFFFFFF;
673  ip0->dst_address.as_u32 = new0;
674  sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ ,
675  dst_address /* offset of changed member */ );
676  ip0->checksum = ip_csum_fold (sum0);
677 
678  sum0 = ip0->checksum;
679  old0 = ip0->src_address.as_u32;
680  new0 = ia0->as_u32;
681  ip0->src_address.as_u32 = new0;
682  sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ ,
683  src_address /* offset of changed member */ );
684  ip0->checksum = ip_csum_fold (sum0);
685 
686  vlib_buffer_advance (b0, -(sizeof (ethernet_header_t)));
687  si0 = vnet_get_sw_interface (vnm, original_sw_if_index);
688  if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
689  vlib_buffer_advance (b0, -4 /* space for VLAN tag */ );
690 
691  mac0 = vlib_buffer_get_current (b0);
692 
693  hi0 = vnet_get_sup_hw_interface (vnm, original_sw_if_index);
694  ei0 = pool_elt_at_index (em->interfaces, hi0->hw_instance);
695  clib_memcpy (mac0->src_address, ei0->address, sizeof (ei0->address));
696  clib_memset (mac0->dst_address, 0xff, sizeof (mac0->dst_address));
697  mac0->type = (si0->type == VNET_SW_INTERFACE_TYPE_SUB) ?
698  clib_net_to_host_u16 (0x8100) : clib_net_to_host_u16 (0x0800);
699 
700  if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
701  {
702  u32 *vlan_tag = (u32 *) (mac0 + 1);
703  u32 tmp;
704  tmp = (si0->sub.id << 16) | 0x0800;
705  *vlan_tag = clib_host_to_net_u32 (tmp);
706  }
707 
708  /* $$$ This needs to be rewritten, for sure */
710  to_next0 = vlib_frame_vector_args (f0);
711  to_next0[0] = bi0;
712  f0->n_vectors = 1;
714 
715  do_trace:
716  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
717  {
718  dhcp_proxy_trace_t *tr = vlib_add_trace (vm, node,
719  b0, sizeof (*tr));
720  tr->which = 1; /* to client */
721  tr->trace_ip4_address.as_u32 = ia0 ? ia0->as_u32 : 0;
722  tr->error = error0;
723  tr->original_sw_if_index = original_sw_if_index;
724  tr->sw_if_index = sw_if_index;
725  }
726  }
727 
728  return from_frame->n_vectors;
729 }
730 
731 /* *INDENT-OFF* */
733  .function = dhcp_proxy_to_client_input,
734  .name = "dhcp-proxy-to-client",
735  /* Takes a vector of packets. */
736  .vector_size = sizeof (u32),
737 
738  .n_errors = DHCP_PROXY_N_ERROR,
739  .error_strings = dhcp_proxy_error_strings,
740  .format_buffer = format_dhcp_proxy_header_with_length,
741  .format_trace = format_dhcp_proxy_trace,
742 #if 0
743  .unformat_buffer = unformat_dhcp_proxy_header,
744 #endif
745 };
746 /* *INDENT-ON* */
747 
748 void
750 {
752  vlib_main_t *vm = dm->vlib_main;
753  int port_regs_diff = dm->udp_ports_registered ^ ports;
754 
755  if (!port_regs_diff)
756  return;
757 
758  if ((port_regs_diff & DHCP_PORT_REG_CLIENT) & ports)
759  udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_client,
760  dhcp_proxy_to_client_node.index, 1 /* is_ip4 */ );
761 
762  if ((port_regs_diff & DHCP_PORT_REG_SERVER) & ports)
763  udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_server,
764  dhcp_proxy_to_server_node.index, 1 /* is_ip4 */ );
765 
766  dm->udp_ports_registered |= ports;
767 }
768 
769 static clib_error_t *
771 {
774 
775  error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
776  dm->error_drop_node_index = error_drop_node->index;
777  dm->vlib_main = vm;
778 
779  return 0;
780 }
781 
782 
784 
785 int
786 dhcp4_proxy_set_server (ip46_address_t * addr,
787  ip46_address_t * src_addr,
788  u32 rx_table_id, u32 server_table_id, int is_del)
789 {
790  u32 rx_fib_index = 0;
791  int rc = 0;
792 
793  const fib_prefix_t all_1s = {
794  .fp_len = 32,
795  .fp_addr.ip4.as_u32 = 0xffffffff,
796  .fp_proto = FIB_PROTOCOL_IP4,
797  };
798 
799  if (ip46_address_is_zero (addr))
800  return VNET_API_ERROR_INVALID_DST_ADDRESS;
801 
802  if (ip46_address_is_zero (src_addr))
803  return VNET_API_ERROR_INVALID_SRC_ADDRESS;
804 
806 
808  rx_table_id,
810 
811  if (is_del)
812  {
813  if (dhcp_proxy_server_del (FIB_PROTOCOL_IP4, rx_fib_index,
814  addr, server_table_id))
815  {
816  fib_table_entry_special_remove (rx_fib_index,
817  &all_1s, FIB_SOURCE_DHCP);
819  }
820  }
821  else
822  {
824  addr, src_addr,
825  rx_fib_index, server_table_id))
826  {
827  fib_table_entry_special_add (rx_fib_index,
828  &all_1s,
831  }
832  }
834 
835  return (rc);
836 }
837 
838 static clib_error_t *
840  unformat_input_t * input,
841  vlib_cli_command_t * cmd)
842 {
843  ip46_address_t server_addr, src_addr;
844  u32 server_table_id = 0, rx_table_id = 0;
845  int is_del = 0;
846  int set_src = 0, set_server = 0;
847 
848  clib_memset (&server_addr, 0, sizeof (server_addr));
849  clib_memset (&src_addr, 0, sizeof (src_addr));
850 
852  {
853  if (unformat (input, "server %U",
854  unformat_ip4_address, &server_addr.ip4))
855  set_server = 1;
856  else if (unformat (input, "server-fib-id %d", &server_table_id))
857  ;
858  else if (unformat (input, "rx-fib-id %d", &rx_table_id))
859  ;
860  else if (unformat (input, "src-address %U",
861  unformat_ip4_address, &src_addr.ip4))
862  set_src = 1;
863  else if (unformat (input, "delete") || unformat (input, "del"))
864  is_del = 1;
865  else
866  break;
867  }
868 
869  if (is_del || (set_server && set_src))
870  {
871  int rv;
872 
873  rv = dhcp4_proxy_set_server (&server_addr, &src_addr, rx_table_id,
874  server_table_id, is_del);
875  switch (rv)
876  {
877  case 0:
878  return 0;
879 
880  case VNET_API_ERROR_INVALID_DST_ADDRESS:
881  return clib_error_return (0, "Invalid server address");
882 
883  case VNET_API_ERROR_INVALID_SRC_ADDRESS:
884  return clib_error_return (0, "Invalid src address");
885 
886  case VNET_API_ERROR_NO_SUCH_ENTRY:
887  return clib_error_return
888  (0, "Fib id %d: no per-fib DHCP server configured", rx_table_id);
889 
890  default:
891  return clib_error_return (0, "BUG: rv %d", rv);
892  }
893  }
894  else
895  return clib_error_return (0, "parse error`%U'",
896  format_unformat_error, input);
897 }
898 
899 /* *INDENT-OFF* */
900 VLIB_CLI_COMMAND (dhcp_proxy_set_command, static) = {
901  .path = "set dhcp proxy",
902  .short_help = "set dhcp proxy [del] server <ip-addr> src-address <ip-addr> [server-fib-id <n>] [rx-fib-id <n>]",
903  .function = dhcp4_proxy_set_command_fn,
904 };
905 /* *INDENT-ON* */
906 
907 static u8 *
908 format_dhcp4_proxy_server (u8 * s, va_list * args)
909 {
910  dhcp_proxy_t *proxy = va_arg (*args, dhcp_proxy_t *);
911  ip4_fib_t *rx_fib, *server_fib;
912  dhcp_server_t *server;
913 
914  if (proxy == 0)
915  {
916  s = format (s, "%=14s%=16s%s", "RX FIB", "Src Address",
917  "Servers FIB,Address");
918  return s;
919  }
920 
921  rx_fib = ip4_fib_get (proxy->rx_fib_index);
922 
923  s = format (s, "%=14u%=16U",
924  rx_fib->table_id,
926 
927  vec_foreach (server, proxy->dhcp_servers)
928  {
929  server_fib = ip4_fib_get (server->server_fib_index);
930  s = format (s, "%u,%U ",
931  server_fib->table_id,
933  }
934  return s;
935 }
936 
937 static int
939 {
940  vlib_main_t *vm = ctx;
941 
942  vlib_cli_output (vm, "%U", format_dhcp4_proxy_server, server);
943 
944  return (1);
945 }
946 
947 static clib_error_t *
949  unformat_input_t * input,
950  vlib_cli_command_t * cmd)
951 {
953  NULL /* header line */ );
954 
956 
957  return (NULL);
958 }
959 
960 /* *INDENT-OFF* */
961 VLIB_CLI_COMMAND (dhcp_proxy_show_command, static) = {
962  .path = "show dhcp proxy",
963  .short_help = "Display dhcp proxy server info",
964  .function = dhcp4_proxy_show_command_fn,
965 };
966 /* *INDENT-ON* */
967 
968 static clib_error_t *
970  unformat_input_t * input, vlib_cli_command_t * cmd)
971 {
972  u8 is_del = 0, vss_type = VSS_TYPE_DEFAULT;
973  u32 oui = 0, fib_id = 0, tbl_id = ~0;
974  u8 *vpn_ascii_id = 0;
975 
977  {
978  if (unformat (input, "table %d", &tbl_id))
979  ;
980  else if (unformat (input, "oui %d", &oui))
981  vss_type = VSS_TYPE_VPN_ID;
982  else if (unformat (input, "vpn-id %d", &fib_id))
983  vss_type = VSS_TYPE_VPN_ID;
984  else if (unformat (input, "vpn-ascii-id %s", &vpn_ascii_id))
985  vss_type = VSS_TYPE_ASCII;
986  else if (unformat (input, "delete") || unformat (input, "del"))
987  is_del = 1;
988  else
989  break;
990  }
991 
992  if (tbl_id == ~0)
993  return clib_error_return (0, "no table ID specified.");
994 
995  int rv = dhcp_proxy_set_vss (FIB_PROTOCOL_IP4, tbl_id, vss_type,
996  vpn_ascii_id, oui, fib_id, is_del);
997  switch (rv)
998  {
999  case 0:
1000  return 0;
1001  case VNET_API_ERROR_NO_SUCH_ENTRY:
1002  return clib_error_return (0,
1003  "option 82 vss for table %d not found in in pool.",
1004  tbl_id);
1005  default:
1006  return clib_error_return (0, "BUG: rv %d", rv);
1007 
1008  }
1009 }
1010 
1011 /* *INDENT-OFF* */
1012 VLIB_CLI_COMMAND (dhcp_proxy_vss_command,static) = {
1013  .path = "set dhcp option-82 vss",
1014  .short_help = "set dhcp option-82 vss [del] table <table id> [oui <n> vpn-id <n> | vpn-ascii-id <text>]",
1015  .function = dhcp_option_82_vss_fn,
1016 };
1017 /* *INDENT-ON* */
1018 
1019 static clib_error_t *
1021  unformat_input_t * input, vlib_cli_command_t * cmd)
1022 {
1024 
1025  return (NULL);
1026 }
1027 
1028 /* *INDENT-OFF* */
1029 VLIB_CLI_COMMAND (dhcp_proxy_vss_show_command, static) = {
1030  .path = "show dhcp vss",
1031  .short_help = "show dhcp VSS",
1032  .function = dhcp_vss_show_command_fn,
1033 };
1034 /* *INDENT-ON* */
1035 
1036 static clib_error_t *
1038  unformat_input_t * input,
1039  vlib_cli_command_t * cmd)
1040 {
1041  vnet_main_t *vnm = vnet_get_main ();
1042  u32 sw_if_index0 = 0, sw_if_index;
1043  vnet_sw_interface_t *swif;
1044  ip4_address_t *ia0;
1045 
1046  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1047  {
1048 
1049  if (unformat (input, "%U",
1050  unformat_vnet_sw_interface, vnm, &sw_if_index0))
1051  {
1052  swif = vnet_get_sw_interface (vnm, sw_if_index0);
1054  swif->unnumbered_sw_if_index : sw_if_index0;
1056  if (ia0)
1057  {
1058  vlib_cli_output (vm, "%=20s%=20s", "interface",
1059  "source IP address");
1060 
1061  vlib_cli_output (vm, "%=20U%=20U",
1063  vnm, sw_if_index0, format_ip4_address, ia0);
1064  }
1065  else
1066  vlib_cli_output (vm, "%=34s %=20U",
1067  "No IPv4 address configured on",
1069  }
1070  else
1071  break;
1072  }
1073 
1074  return 0;
1075 }
1076 
1077 /* *INDENT-OFF* */
1078 VLIB_CLI_COMMAND (dhcp_proxy_address_show_command,static) = {
1079  .path = "show dhcp option-82-address interface",
1080  .short_help = "show dhcp option-82-address interface <interface>",
1082 };
1083 /* *INDENT-ON* */
1084 
1085 /*
1086  * fd.io coding-style-patch-verification: ON
1087  *
1088  * Local Variables:
1089  * eval: (c-set-style "gnu")
1090  * End:
1091  */
static vlib_node_registration_t dhcp_proxy_to_client_node
(constructor) VLIB_REGISTER_NODE (dhcp_proxy_to_client_node)
u32 sw_if_index
Definition: ipsec_gre.api:37
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
static dhcp_vss_t * dhcp_get_vss_info(dhcp_proxy_main_t *dm, u32 rx_fib_index, fib_protocol_t proto)
Get the VSS data for the FIB index.
Definition: dhcp_proxy.h:255
static u8 * vlib_buffer_get_tail(vlib_buffer_t *b)
Get pointer to the end of buffer&#39;s data.
Definition: buffer.h:310
#define CLIB_UNUSED(x)
Definition: clib.h:82
ip4_address_t src_address
Definition: ip4_packet.h:170
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)
void dhcp_vss_walk(fib_protocol_t proto, dhcp_vss_walk_fn_t fn, void *ctx)
Walk/Visit each DHCP proxy VSS.
Definition: dhcp_proxy.c:87
dhcp_server_t * dhcp_servers
The set of DHCP servers to which messages are relayed.
Definition: dhcp_proxy.h:111
static uword dhcp_proxy_to_client_input(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
void dhcp_proxy_walk(fib_protocol_t proto, dhcp_proxy_walk_fn_t fn, void *ctx)
Walk/Visit each DHCP proxy server.
Definition: dhcp_proxy.c:67
static clib_error_t * dhcp4_proxy_show_command_fn(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
#define VPP_DHCP_OPTION82_SIZE
#define NULL
Definition: clib.h:58
clib_memset(h->entries, 0, sizeof(h->entries[0]) *entries)
u32 index
Definition: node.h:279
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:314
dhcp_proxy_main_t dhcp_proxy_main
Shard 4/6 instance of DHCP main.
Definition: dhcp_proxy.c:25
u8 src_address[6]
Definition: packet.h:56
int dhcp_vss_show_walk(dhcp_vss_t *vss, u32 rx_table_id, void *ctx)
Show (on CLI) a VSS config during a show walk.
Definition: dhcp_proxy.c:259
static uword dhcp_proxy_to_server_input(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:113
ip46_address_t dhcp_src_address
The source address to use in relayed messaes.
Definition: dhcp_proxy.h:126
The Virtual Sub-net Selection information for a given RX FIB.
Definition: dhcp_proxy.h:57
int dhcp_client_for_us(u32 bi, vlib_buffer_t *b, ip4_header_t *ip, udp_header_t *udp, dhcp_header_t *dhcp)
Definition: client.c:161
u32 rx_fib_index
The FIB index (not the external Table-ID) in which the client is resides.
Definition: dhcp_proxy.h:132
format_function_t format_ip46_address
Definition: format.h:61
uword ip_csum_t
Definition: ip_packet.h:181
static vnet_sw_interface_t * vnet_get_sw_interface(vnet_main_t *vnm, u32 sw_if_index)
u32 * fib_index_by_sw_if_index
Table index indexed by software interface.
Definition: ip4.h:112
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
unformat_function_t unformat_vnet_sw_interface
vlib_node_registration_t error_drop_node
(constructor) VLIB_REGISTER_NODE (error_drop_node)
Definition: drop.c:257
u8 vss_type
VSS type as defined in RFC 6607: 0 for NVT ASCII VPN Identifier 1 for RFC 2685 VPN-ID of 7 octects - ...
Definition: dhcp_proxy.h:65
vhost_vring_addr_t addr
Definition: vhost_user.h:121
format_function_t format_vnet_sw_if_index_name
unsigned char u8
Definition: types.h:56
static vlib_buffer_t * vlib_buffer_copy(vlib_main_t *vm, vlib_buffer_t *b)
Definition: buffer_funcs.h:959
#define clib_memcpy(d, s, n)
Definition: string.h:180
format_function_t format_ip4_address
Definition: format.h:75
unformat_function_t unformat_ip4_address
Definition: format.h:70
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:163
u32 table_id
Definition: ip4_fib.h:54
void fib_table_entry_special_remove(u32 fib_index, const fib_prefix_t *prefix, fib_source_t source)
Remove a &#39;special&#39; entry from the FIB.
Definition: fib_table.c:407
ip4_address_t dst_address
Definition: ip4_packet.h:170
u8 dst_address[6]
Definition: packet.h:55
static vlib_node_registration_t dhcp_proxy_to_server_node
(constructor) VLIB_REGISTER_NODE (dhcp_proxy_to_server_node)
Aggregrate type for a prefix.
Definition: fib_types.h:203
vlib_frame_t * vlib_get_frame_to_node(vlib_main_t *vm, u32 to_node_index)
Definition: main.c:187
static clib_error_t * dhcp4_proxy_set_command_fn(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
static dhcp_proxy_t * dhcp_get_proxy(dhcp_proxy_main_t *dm, u32 rx_fib_index, fib_protocol_t proto)
Get the DHCP proxy server data for the FIB index.
Definition: dhcp_proxy.h:275
#define clib_error_return(e, args...)
Definition: error.h:99
#define VSS_TYPE_ASCII
Definition: dhcp_proxy.h:66
int dhcp_proxy_server_add(fib_protocol_t proto, ip46_address_t *addr, ip46_address_t *src_address, u32 rx_fib_index, u32 server_table_id)
Add a new DHCP proxy server configuration.
Definition: dhcp_proxy.c:184
unsigned int u32
Definition: types.h:88
u16 fp_len
The mask length.
Definition: fib_types.h:207
#define VSS_TYPE_DEFAULT
Definition: dhcp_proxy.h:69
static u32 vlib_get_buffer_index(vlib_main_t *vm, void *p)
Translate buffer pointer into buffer index.
Definition: buffer_funcs.h:257
u32 server_fib_index
The FIB index (not the external Table-ID) in which the server is reachable.
Definition: dhcp_proxy.h:95
static u8 * format_dhcp4_proxy_server(u8 *s, va_list *args)
static u32 vlib_buffer_chain_linearize(vlib_main_t *vm, vlib_buffer_t *b)
Definition: fib_entry.h:280
dhcp_port_reg_flags_t
Definition: dhcp_proxy.h:48
Collection of global DHCP proxy data.
Definition: dhcp_proxy.h:140
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:514
vnet_sub_interface_t sub
Definition: interface.h:704
long ctx[MAX_CONNS]
Definition: main.c:144
struct _unformat_input_t unformat_input_t
unsigned short u16
Definition: types.h:57
dhcp_proxy_to_server_input_next_t
void vlib_put_frame_to_node(vlib_main_t *vm, u32 to_node_index, vlib_frame_t *f)
Definition: main.c:196
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:229
#define PREDICT_FALSE(x)
Definition: clib.h:111
vnet_sw_interface_flags_t flags
Definition: interface.h:684
vlib_main_t * vlib_main
Definition: dhcp_proxy.h:160
vl_api_address_union_t src_address
Definition: ip_types.api:44
static char * dhcp_proxy_error_strings[]
int dhcp_proxy_set_vss(fib_protocol_t proto, u32 tbl_id, u8 vss_type, u8 *vpn_ascii_id, u32 oui, u32 vpn_index, u8 is_del)
Configure/set a new VSS info.
Definition: dhcp_proxy.c:309
#define vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, bi0, next0)
Finish enqueueing one buffer forward in the graph.
Definition: buffer_node.h:218
#define vlib_get_next_frame(vm, node, next_index, vectors, n_vectors_left)
Get pointer to next frame vector data by (vlib_node_runtime_t, next_index).
Definition: node_funcs.h:338
void fib_table_unlock(u32 fib_index, fib_protocol_t proto, fib_source_t source)
Take a reference counting lock on the table.
Definition: fib_table.c:1237
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1150
u8 len
Definition: ip_types.api:49
static clib_error_t * dhcp4_proxy_init(vlib_main_t *vm)
fib_node_index_t fib_table_entry_special_add(u32 fib_index, const fib_prefix_t *prefix, fib_source_t source, fib_entry_flag_t flags)
Add a &#39;special&#39; entry to the FIB.
Definition: fib_table.c:388
The IPv4 FIB.
Definition: ip4_fib.h:39
dhcp_option_t options[0]
Definition: dhcp4_packet.h:51
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
static void vlib_buffer_copy_trace_flag(vlib_main_t *vm, vlib_buffer_t *b, u32 bi_target)
Definition: trace_funcs.h:147
#define UNFORMAT_END_OF_INPUT
Definition: format.h:144
u8 * vpn_ascii_id
Type 0 ASCII VPN Identifier.
Definition: dhcp_proxy.h:77
u16 n_vectors
Definition: node.h:395
vlib_main_t * vm
Definition: buffer.c:312
static clib_error_t * dhcp_option_82_address_show_command_fn(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
static ip4_fib_t * ip4_fib_get(u32 index)
Get the FIB at the given index.
Definition: ip4_fib.h:113
A representation of a single DHCP Server within a given VRF config.
Definition: dhcp_proxy.h:83
void vlib_put_next_frame(vlib_main_t *vm, vlib_node_runtime_t *r, u32 next_index, u32 n_vectors_left)
Release pointer to next frame vector data.
Definition: main.c:458
vlib_node_t * vlib_get_node_by_name(vlib_main_t *vm, u8 *name)
Definition: node.c:45
static u32 vlib_buffer_space_left_at_end(vlib_main_t *vm, vlib_buffer_t *b)
void fib_table_lock(u32 fib_index, fib_protocol_t proto, fib_source_t source)
Release a reference counting lock on the table.
Definition: fib_table.c:1257
#define VLIB_CLI_COMMAND(x,...)
Definition: cli.h:155
int dhcp4_proxy_set_server(ip46_address_t *addr, ip46_address_t *src_addr, u32 rx_table_id, u32 server_table_id, int is_del)
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:513
ip46_address_t dhcp_server
The address of the DHCP server to which to relay the client&#39;s messages.
Definition: dhcp_proxy.h:89
static u8 * format_dhcp_proxy_trace(u8 *s, va_list *args)
#define foreach_dhcp_proxy_to_server_input_next
ip4_address_t gateway_ip_address
Definition: dhcp4_packet.h:46
static clib_error_t * dhcp_option_82_vss_fn(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
IPv4 main type.
Definition: ip4.h:96
u32 fib_table_find_or_create_and_lock(fib_protocol_t proto, u32 table_id, fib_source_t src)
Get the index of the FIB for a Table-ID.
Definition: fib_table.c:1123
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:248
static clib_error_t * dhcp_vss_show_command_fn(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
ip4_address_t trace_ip4_address
static void * vlib_add_trace(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_buffer_t *b, u32 n_data_bytes)
Definition: trace_funcs.h:57
struct _vlib_node_registration vlib_node_registration_t
A DHCP proxy represenation fpr per-client VRF config.
Definition: dhcp_proxy.h:101
Definition: defs.h:47
int dhcp_proxy_server_del(fib_protocol_t proto, u32 rx_fib_index, ip46_address_t *addr, u32 server_table_id)
Delete a DHCP proxy config.
Definition: dhcp_proxy.c:144
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
u8 vpn_id[7]
Type 1 VPN-ID.
Definition: dhcp_proxy.h:73
DHCP.
Definition: fib_entry.h:94
#define VLIB_BUFFER_TRACE_TRAJECTORY_INIT(b)
Definition: buffer.h:451
VLIB buffer representation.
Definition: buffer.h:102
u64 uword
Definition: types.h:112
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:244
#define ip_csum_update(sum, old, new, type, field)
Definition: ip_packet.h:231
void dhcp_maybe_register_udp_ports(dhcp_port_reg_flags_t ports)
Register the dhcp client and/or server ports, if not already done.
#define VSS_TYPE_VPN_ID
Definition: dhcp_proxy.h:67
static u8 * format_dhcp_proxy_header_with_length(u8 *s, va_list *args)
static ethernet_main_t * vnet_get_ethernet_main(void)
Definition: ethernet.h:536
#define vnet_buffer(b)
Definition: buffer.h:369
u8 * format_unformat_error(u8 *s, va_list *va)
Definition: unformat.c:91
vnet_sw_interface_type_t type
Definition: interface.h:682
ip4_main_t ip4_main
Global ip4 main structure.
Definition: ip4_forward.c:905
#define vec_foreach(var, vec)
Vector iterator.
void udp_register_dst_port(vlib_main_t *vm, udp_dst_port_t dst_port, u32 node_index, u8 is_ip4)
Definition: udp_local.c:484
ethernet_interface_t * interfaces
Definition: ethernet.h:272
#define ip46_address_is_zero(ip46)
Definition: ip6_packet.h:93
void vlib_cli_output(vlib_main_t *vm, char *fmt,...)
Definition: cli.c:762
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:85
static int dhcp4_proxy_show_walk(dhcp_proxy_t *server, void *ctx)
static u16 ip_csum_fold(ip_csum_t c)
Definition: ip_packet.h:237
uword unformat(unformat_input_t *i, const char *fmt,...)
Definition: unformat.c:972
Definition: defs.h:46
static uword unformat_check_input(unformat_input_t *i)
Definition: format.h:170