Line data Source code
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 : #include <vlib/vlib.h>
16 : #include <vlibmemory/api.h>
17 : #include <dhcp/client.h>
18 : #include <dhcp/dhcp_proxy.h>
19 : #include <vnet/fib/fib_table.h>
20 : #include <vnet/qos/qos_types.h>
21 :
22 : vlib_log_class_t dhcp_logger;
23 :
24 : dhcp_client_main_t dhcp_client_main;
25 : static vlib_node_registration_t dhcp_client_process_node;
26 :
27 : #define DHCP_DBG(...) \
28 : vlib_log_debug (dhcp_logger, __VA_ARGS__)
29 :
30 : #define DHCP_INFO(...) \
31 : vlib_log_notice (dhcp_logger, __VA_ARGS__)
32 :
33 : #define foreach_dhcp_sent_packet_stat \
34 : _(DISCOVER, "DHCP discover packets sent") \
35 : _(OFFER, "DHCP offer packets sent") \
36 : _(REQUEST, "DHCP request packets sent") \
37 : _(ACK, "DHCP ack packets sent")
38 :
39 : #define foreach_dhcp_error_counter \
40 : _(NOT_FOR_US, "DHCP packets for other hosts, dropped") \
41 : _(NAK, "DHCP nak packets received") \
42 : _(NON_OFFER_DISCOVER, "DHCP non-offer packets in discover state") \
43 : _(ODDBALL, "DHCP non-ack, non-offer packets received") \
44 : _(BOUND, "DHCP bind success")
45 :
46 : typedef enum
47 : {
48 : #define _(sym,str) DHCP_STAT_##sym,
49 : foreach_dhcp_sent_packet_stat foreach_dhcp_error_counter
50 : #undef _
51 : DHCP_STAT_UNKNOWN,
52 : DHCP_STAT_N_STAT,
53 : } sample_error_t;
54 :
55 : static char *dhcp_client_process_stat_strings[] = {
56 : #define _(sym,string) string,
57 : foreach_dhcp_sent_packet_stat foreach_dhcp_error_counter
58 : #undef _
59 : "DHCP unknown packets sent",
60 : };
61 :
62 : static u8 *
63 33 : format_dhcp_client_state (u8 * s, va_list * va)
64 : {
65 33 : dhcp_client_state_t state = va_arg (*va, dhcp_client_state_t);
66 33 : char *str = "BOGUS!";
67 :
68 33 : switch (state)
69 : {
70 : #define _(a) \
71 : case a: \
72 : str = #a; \
73 : break;
74 33 : foreach_dhcp_client_state;
75 : #undef _
76 0 : default:
77 0 : break;
78 : }
79 :
80 33 : s = format (s, "%s", str);
81 33 : return s;
82 : }
83 :
84 : static u8 *
85 33 : format_dhcp_client (u8 * s, va_list * va)
86 : {
87 33 : dhcp_client_main_t *dcm = va_arg (*va, dhcp_client_main_t *);
88 33 : dhcp_client_t *c = va_arg (*va, dhcp_client_t *);
89 33 : int verbose = va_arg (*va, int);
90 : ip4_address_t *addr;
91 :
92 33 : s = format (s, "[%d] %U state %U installed %d", c - dcm->clients,
93 : format_vnet_sw_if_index_name, dcm->vnet_main, c->sw_if_index,
94 33 : format_dhcp_client_state, c->state, c->addresses_installed);
95 :
96 33 : if (0 != c->dscp)
97 8 : s = format (s, " dscp %d", c->dscp);
98 :
99 33 : if (c->installed.leased_address.as_u32)
100 : {
101 13 : s = format (s, " addr %U/%d gw %U server %U",
102 : format_ip4_address, &c->installed.leased_address,
103 : c->installed.subnet_mask_width,
104 : format_ip4_address, &c->installed.router_address,
105 : format_ip4_address, &c->installed.dhcp_server);
106 :
107 13 : vec_foreach (addr, c->domain_server_address)
108 0 : s = format (s, " dns %U", format_ip4_address, addr);
109 : }
110 : else
111 : {
112 20 : s = format (s, " no address");
113 : }
114 :
115 33 : if (verbose)
116 : {
117 : s =
118 33 : format (s,
119 : "\n lease: lifetime:%d renewal-interval:%d expires:%.2f (now:%.2f)",
120 : c->lease_lifetime, c->lease_renewal_interval,
121 : c->lease_expires, vlib_time_now (dcm->vlib_main));
122 : s =
123 33 : format (s, "\n retry-count:%d, next-xmt:%.2f", c->retry_count,
124 : c->next_transmit);
125 33 : s = format (s, "\n broadcast adjacency:%d", c->ai_bcast);
126 : }
127 33 : return s;
128 : }
129 :
130 : static void
131 5 : dhcp_client_acquire_address (dhcp_client_main_t * dcm, dhcp_client_t * c)
132 : {
133 : /*
134 : * Install any/all info gleaned from dhcp, right here
135 : */
136 5 : if (!c->addresses_installed)
137 : {
138 5 : ip4_add_del_interface_address (dcm->vlib_main, c->sw_if_index,
139 : (void *) &c->learned.leased_address,
140 : c->learned.subnet_mask_width,
141 : 0 /*is_del */ );
142 5 : if (c->learned.router_address.as_u32)
143 : {
144 5 : fib_prefix_t all_0s = {
145 : .fp_len = 0,
146 : .fp_proto = FIB_PROTOCOL_IP4,
147 : };
148 5 : ip46_address_t nh = {
149 : .ip4 = c->learned.router_address,
150 : };
151 :
152 : /* *INDENT-OFF* */
153 5 : fib_table_entry_path_add (
154 : fib_table_get_index_for_sw_if_index (
155 : FIB_PROTOCOL_IP4,
156 : c->sw_if_index),
157 : &all_0s,
158 : FIB_SOURCE_DHCP,
159 : FIB_ENTRY_FLAG_NONE,
160 : DPO_PROTO_IP4,
161 : &nh, c->sw_if_index,
162 : ~0, 1, NULL, // no label stack
163 : FIB_ROUTE_PATH_FLAG_NONE);
164 : /* *INDENT-ON* */
165 : }
166 : }
167 5 : clib_memcpy (&c->installed, &c->learned, sizeof (c->installed));
168 5 : c->addresses_installed = 1;
169 5 : }
170 :
171 : static void
172 11 : dhcp_client_release_address (dhcp_client_main_t * dcm, dhcp_client_t * c)
173 : {
174 : /*
175 : * Remove any/all info gleaned from dhcp, right here. Caller(s)
176 : * have not wiped out the info yet.
177 : */
178 11 : if (c->addresses_installed)
179 : {
180 5 : ip4_add_del_interface_address (dcm->vlib_main, c->sw_if_index,
181 : (void *) &c->installed.leased_address,
182 : c->installed.subnet_mask_width,
183 : 1 /*is_del */ );
184 :
185 : /* Remove the default route */
186 5 : if (c->installed.router_address.as_u32)
187 : {
188 5 : fib_prefix_t all_0s = {
189 : .fp_len = 0,
190 : .fp_proto = FIB_PROTOCOL_IP4,
191 : };
192 5 : ip46_address_t nh = {
193 : .ip4 = c->installed.router_address,
194 : };
195 :
196 5 : fib_table_entry_path_remove (fib_table_get_index_for_sw_if_index
197 : (FIB_PROTOCOL_IP4, c->sw_if_index),
198 : &all_0s, FIB_SOURCE_DHCP,
199 : DPO_PROTO_IP4, &nh, c->sw_if_index, ~0,
200 : 1, FIB_ROUTE_PATH_FLAG_NONE);
201 : }
202 : }
203 11 : clib_memset (&c->installed, 0, sizeof (c->installed));
204 11 : c->addresses_installed = 0;
205 11 : }
206 :
207 : static void
208 4 : dhcp_client_proc_callback (uword * client_index)
209 : {
210 4 : vlib_main_t *vm = vlib_get_main ();
211 4 : ASSERT (vlib_get_thread_index () == 0);
212 4 : vlib_process_signal_event (vm, dhcp_client_process_node.index,
213 : EVENT_DHCP_CLIENT_WAKEUP, *client_index);
214 4 : }
215 :
216 : static void
217 5 : dhcp_client_addr_callback (u32 * cindex)
218 : {
219 5 : dhcp_client_main_t *dcm = &dhcp_client_main;
220 : dhcp_client_t *c;
221 :
222 5 : c = pool_elt_at_index (dcm->clients, *cindex);
223 :
224 : /* disable the feature */
225 5 : vnet_feature_enable_disable ("ip4-unicast",
226 : "ip4-dhcp-client-detect",
227 : c->sw_if_index, 0 /* disable */ , 0, 0);
228 5 : c->client_detect_feature_enabled = 0;
229 :
230 : /* add the address to the interface if they've changed since the last time */
231 5 : if (0 != clib_memcmp (&c->installed, &c->learned, sizeof (c->learned)))
232 : {
233 5 : dhcp_client_release_address (dcm, c);
234 5 : dhcp_client_acquire_address (dcm, c);
235 : }
236 :
237 : /*
238 : * Call the user's event callback to report DHCP information
239 : */
240 5 : if (c->event_callback)
241 0 : c->event_callback (c->client_index, c);
242 :
243 5 : DHCP_INFO ("update: %U", format_dhcp_client, dcm, c, 1 /* verbose */ );
244 5 : }
245 :
246 : static void
247 6 : dhcp_client_reset (dhcp_client_main_t * dcm, dhcp_client_t * c)
248 : {
249 6 : vlib_worker_thread_barrier_sync (dcm->vlib_main);
250 6 : if (c->client_detect_feature_enabled == 1)
251 : {
252 3 : vnet_feature_enable_disable ("ip4-unicast",
253 : "ip4-dhcp-client-detect",
254 : c->sw_if_index, 0, 0, 0);
255 3 : c->client_detect_feature_enabled = 0;
256 : }
257 6 : dhcp_client_release_address (dcm, c);
258 6 : vlib_worker_thread_barrier_release (dcm->vlib_main);
259 :
260 6 : clib_memset (&c->learned, 0, sizeof (c->installed));
261 6 : c->state = DHCP_DISCOVER;
262 6 : c->next_transmit = vlib_time_now (dcm->vlib_main);
263 6 : c->retry_count = 0;
264 6 : c->lease_renewal_interval = 0;
265 6 : vec_free (c->domain_server_address);
266 6 : }
267 :
268 : /*
269 : * dhcp_client_for_us - server-to-client callback.
270 : * Called from proxy_node.c:dhcp_proxy_to_client_input().
271 : * This function first decides that the packet in question is
272 : * actually for the dhcp client code in case we're also acting as
273 : * a dhcp proxy. Ay caramba, what a folly!
274 : */
275 : int
276 14 : dhcp_client_for_us (u32 bi, vlib_buffer_t * b,
277 : ip4_header_t * ip,
278 : udp_header_t * udp, dhcp_header_t * dhcp)
279 : {
280 14 : dhcp_client_main_t *dcm = &dhcp_client_main;
281 14 : vlib_main_t *vm = vlib_get_main ();
282 : dhcp_client_t *c;
283 : uword *p;
284 14 : f64 now = vlib_time_now (vm);
285 14 : u8 dhcp_message_type = 0;
286 : dhcp_option_t *o;
287 :
288 : /*
289 : * Doing dhcp client on this interface?
290 : * Presumably we will always receive dhcp clnt for-us pkts on
291 : * the interface that's asking for an address.
292 : */
293 14 : p = hash_get (dcm->client_by_sw_if_index,
294 : vnet_buffer (b)->sw_if_index[VLIB_RX]);
295 14 : if (p == 0)
296 5 : return 0; /* no */
297 :
298 9 : c = pool_elt_at_index (dcm->clients, p[0]);
299 :
300 : /* Mixing dhcp relay and dhcp proxy? DGMS... */
301 9 : if (c->state == DHCP_BOUND && c->retry_count == 0)
302 0 : return 0;
303 :
304 : /* Packet not for us? Turf it... */
305 9 : if (memcmp (dhcp->client_hardware_address, c->client_hardware_address,
306 : sizeof (c->client_hardware_address)))
307 : {
308 0 : vlib_node_increment_counter (vm, dhcp_client_process_node.index,
309 : DHCP_STAT_NOT_FOR_US, 1);
310 0 : return 0;
311 : }
312 :
313 : /* parse through the packet, learn what we can */
314 9 : if (dhcp->your_ip_address.as_u32)
315 9 : c->learned.leased_address.as_u32 = dhcp->your_ip_address.as_u32;
316 :
317 9 : c->learned.dhcp_server.as_u32 = dhcp->server_ip_address.as_u32;
318 :
319 9 : o = (dhcp_option_t *) dhcp->options;
320 :
321 45 : while (o->option != 0xFF /* end of options */ &&
322 36 : (u8 *) o < (b->data + b->current_data + b->current_length))
323 : {
324 36 : switch (o->option)
325 : {
326 9 : case 53: /* dhcp message type */
327 9 : dhcp_message_type = o->data[0];
328 9 : break;
329 :
330 6 : case 51: /* lease time */
331 : {
332 : u32 lease_time_in_seconds =
333 6 : clib_host_to_net_u32 (o->data_as_u32[0]);
334 : // for debug: lease_time_in_seconds = 20; /*$$$$*/
335 6 : c->lease_expires = now + (f64) lease_time_in_seconds;
336 6 : c->lease_lifetime = lease_time_in_seconds;
337 : /* Set a sensible default, in case we don't get opt 58 */
338 6 : c->lease_renewal_interval = lease_time_in_seconds / 2;
339 : }
340 6 : break;
341 :
342 2 : case 58: /* lease renew time in seconds */
343 : {
344 : u32 lease_renew_time_in_seconds =
345 2 : clib_host_to_net_u32 (o->data_as_u32[0]);
346 2 : c->lease_renewal_interval = lease_renew_time_in_seconds;
347 : }
348 2 : break;
349 :
350 9 : case 54: /* dhcp server address */
351 9 : c->learned.dhcp_server.as_u32 = o->data_as_u32[0];
352 9 : break;
353 :
354 5 : case 1: /* subnet mask */
355 : {
356 5 : u32 subnet_mask = clib_host_to_net_u32 (o->data_as_u32[0]);
357 5 : c->learned.subnet_mask_width = count_set_bits (subnet_mask);
358 : }
359 5 : break;
360 5 : case 3: /* router address */
361 : {
362 5 : u32 router_address = o->data_as_u32[0];
363 5 : c->learned.router_address.as_u32 = router_address;
364 : }
365 5 : break;
366 0 : case 6: /* domain server address */
367 : {
368 0 : vec_free (c->domain_server_address);
369 0 : vec_validate (c->domain_server_address,
370 : o->length / sizeof (ip4_address_t) - 1);
371 0 : clib_memcpy (c->domain_server_address, o->data, o->length);
372 : }
373 0 : break;
374 0 : case 12: /* hostname */
375 : {
376 : /* Replace the existing hostname if necessary */
377 0 : vec_free (c->hostname);
378 0 : vec_validate (c->hostname, o->length - 1);
379 0 : clib_memcpy (c->hostname, o->data, o->length);
380 : }
381 0 : break;
382 :
383 : /* $$$$ Your message in this space, parse more options */
384 0 : default:
385 0 : break;
386 : }
387 :
388 36 : o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
389 : }
390 :
391 9 : switch (c->state)
392 : {
393 4 : case DHCP_DISCOVER:
394 4 : if (dhcp_message_type != DHCP_PACKET_OFFER)
395 : {
396 0 : vlib_node_increment_counter (vm, dhcp_client_process_node.index,
397 : DHCP_STAT_NON_OFFER_DISCOVER, 1);
398 0 : c->next_transmit = now + 5.0;
399 0 : break;
400 : }
401 :
402 : /* Received an offer, go send a request */
403 4 : c->state = DHCP_REQUEST;
404 4 : c->retry_count = 0;
405 4 : c->next_transmit = 0; /* send right now... */
406 : /* Poke the client process, which will send the request */
407 4 : uword client_id = c - dcm->clients;
408 4 : vl_api_rpc_call_main_thread (dhcp_client_proc_callback,
409 : (u8 *) & client_id, sizeof (uword));
410 4 : break;
411 :
412 5 : case DHCP_BOUND:
413 : case DHCP_REQUEST:
414 5 : if (dhcp_message_type == DHCP_PACKET_NAK)
415 : {
416 0 : vlib_node_increment_counter (vm, dhcp_client_process_node.index,
417 : DHCP_STAT_NAK, 1);
418 : /* Probably never happens in bound state, but anyhow...
419 : Wipe out any memory of the address we had... */
420 0 : dhcp_client_reset (dcm, c);
421 0 : break;
422 : }
423 :
424 5 : if (dhcp_message_type != DHCP_PACKET_ACK &&
425 : dhcp_message_type != DHCP_PACKET_OFFER)
426 : {
427 0 : vlib_node_increment_counter (vm, dhcp_client_process_node.index,
428 : DHCP_STAT_NON_OFFER_DISCOVER, 1);
429 0 : clib_warning ("sw_if_index %d state %U message type %d",
430 : c->sw_if_index, format_dhcp_client_state,
431 : c->state, dhcp_message_type);
432 0 : c->next_transmit = now + 5.0;
433 0 : break;
434 : }
435 : /* OK, we own the address (etc), add to the routing table(s) */
436 : {
437 : /* Send the index over to the main thread, where it can retrieve
438 : * the original client */
439 5 : u32 cindex = c - dcm->clients;
440 5 : vl_api_force_rpc_call_main_thread (dhcp_client_addr_callback,
441 : (u8 *) & cindex, sizeof (u32));
442 : }
443 :
444 5 : c->state = DHCP_BOUND;
445 5 : c->retry_count = 0;
446 5 : c->next_transmit = now + (f64) c->lease_renewal_interval;
447 5 : c->lease_expires = now + (f64) c->lease_lifetime;
448 5 : vlib_node_increment_counter (vm, dhcp_client_process_node.index,
449 : DHCP_STAT_BOUND, 1);
450 5 : break;
451 :
452 0 : default:
453 0 : clib_warning ("client %d bogus state %d", c - dcm->clients, c->state);
454 0 : break;
455 : }
456 :
457 : /* return 1 so the call disposes of this packet */
458 9 : return 1;
459 : }
460 :
461 : static void
462 14 : send_dhcp_pkt (dhcp_client_main_t * dcm, dhcp_client_t * c,
463 : dhcp_packet_type_t type, int is_broadcast)
464 : {
465 14 : vlib_main_t *vm = dcm->vlib_main;
466 14 : vnet_main_t *vnm = dcm->vnet_main;
467 14 : vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, c->sw_if_index);
468 : vnet_sw_interface_t *sup_sw
469 14 : = vnet_get_sup_sw_interface (vnm, c->sw_if_index);
470 14 : vnet_sw_interface_t *sw = vnet_get_sw_interface (vnm, c->sw_if_index);
471 : vlib_buffer_t *b;
472 : u32 bi;
473 : ip4_header_t *ip;
474 : udp_header_t *udp;
475 : dhcp_header_t *dhcp;
476 : u32 *to_next;
477 : vlib_frame_t *f;
478 : dhcp_option_t *o;
479 : u16 udp_length, ip_length;
480 : u32 counter_index, node_index;
481 :
482 14 : DHCP_INFO ("send: type:%U bcast:%d %U",
483 : format_dhcp_packet_type, type,
484 : is_broadcast, format_dhcp_client, dcm, c, 1 /* verbose */ );
485 :
486 : /* Interface(s) down? */
487 14 : if ((hw->flags & VNET_HW_INTERFACE_FLAG_LINK_UP) == 0)
488 1 : return;
489 13 : if ((sup_sw->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) == 0)
490 0 : return;
491 13 : if ((sw->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) == 0)
492 0 : return;
493 :
494 13 : if (vlib_buffer_alloc (vm, &bi, 1) != 1)
495 : {
496 0 : clib_warning ("buffer allocation failure");
497 0 : c->next_transmit = 0;
498 0 : return;
499 : }
500 :
501 : /* Build a dhcpv4 pkt from whole cloth */
502 13 : b = vlib_get_buffer (vm, bi);
503 :
504 13 : ASSERT (b->current_data == 0);
505 :
506 13 : vnet_buffer (b)->sw_if_index[VLIB_RX] = c->sw_if_index;
507 13 : b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
508 :
509 13 : if (is_broadcast)
510 : {
511 10 : node_index = ip4_rewrite_node.index;
512 10 : vnet_buffer (b)->ip.adj_index[VLIB_TX] = c->ai_bcast;
513 : }
514 : else
515 3 : node_index = dcm->ip4_lookup_node_index;
516 :
517 : /* Enqueue the packet right now */
518 13 : f = vlib_get_frame_to_node (vm, node_index);
519 13 : to_next = vlib_frame_vector_args (f);
520 13 : to_next[0] = bi;
521 13 : f->n_vectors = 1;
522 13 : vlib_put_frame_to_node (vm, node_index, f);
523 :
524 : /* build the headers */
525 13 : ip = vlib_buffer_get_current (b);
526 13 : udp = (udp_header_t *) (ip + 1);
527 13 : dhcp = (dhcp_header_t *) (udp + 1);
528 :
529 : /* $$$ optimize, maybe */
530 13 : clib_memset (ip, 0, sizeof (*ip) + sizeof (*udp) + sizeof (*dhcp));
531 :
532 13 : ip->ip_version_and_header_length = 0x45;
533 13 : ip->ttl = 128;
534 13 : ip->protocol = IP_PROTOCOL_UDP;
535 :
536 13 : ip->tos = c->dscp;
537 :
538 13 : if (ip->tos)
539 : {
540 : /*
541 : * Setup the buffer's QoS settings so any QoS marker on the egress
542 : * interface, that might set VLAN CoS bits, based on this DSCP setting
543 : */
544 3 : vnet_buffer2 (b)->qos.source = QOS_SOURCE_IP;
545 3 : vnet_buffer2 (b)->qos.bits = ip->tos;
546 3 : b->flags |= VNET_BUFFER_F_QOS_DATA_VALID;
547 : }
548 :
549 13 : if (is_broadcast)
550 : {
551 : /* src = 0.0.0.0, dst = 255.255.255.255 */
552 10 : ip->dst_address.as_u32 = ~0;
553 : }
554 : else
555 : {
556 : /* Renewing an active lease, plain old ip4 src/dst */
557 3 : ip->src_address.as_u32 = c->learned.leased_address.as_u32;
558 3 : ip->dst_address.as_u32 = c->learned.dhcp_server.as_u32;
559 : }
560 :
561 13 : udp->src_port = clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client);
562 13 : udp->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_server);
563 :
564 : /* Send the interface MAC address */
565 13 : clib_memcpy (dhcp->client_hardware_address,
566 : vnet_sw_interface_get_hw_address (vnm, c->sw_if_index), 6);
567 :
568 : /* And remember it for rx-packet-for-us checking */
569 13 : clib_memcpy (c->client_hardware_address, dhcp->client_hardware_address,
570 : sizeof (c->client_hardware_address));
571 :
572 : /* Lease renewal, set up client_ip_address */
573 13 : if (is_broadcast == 0)
574 3 : dhcp->client_ip_address.as_u32 = c->learned.leased_address.as_u32;
575 :
576 13 : dhcp->opcode = 1; /* request, all we send */
577 13 : dhcp->hardware_type = 1; /* ethernet */
578 13 : dhcp->hardware_address_length = 6;
579 13 : dhcp->transaction_identifier = c->transaction_id;
580 13 : dhcp->flags =
581 13 : clib_host_to_net_u16 (is_broadcast && c->set_broadcast_flag ?
582 : DHCP_FLAG_BROADCAST : 0);
583 13 : dhcp->magic_cookie.as_u32 = DHCP_MAGIC;
584 :
585 13 : o = (dhcp_option_t *) dhcp->options;
586 :
587 : /* Send option 53, the DHCP message type */
588 13 : o->option = DHCP_PACKET_OPTION_MSG_TYPE;
589 13 : o->length = 1;
590 13 : o->data[0] = type;
591 13 : o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
592 :
593 : /* Send option 57, max msg length */
594 : if (0 /* not needed, apparently */ )
595 : {
596 : o->option = 57;
597 : o->length = 2;
598 : {
599 : u16 *o2 = (u16 *) o->data;
600 : *o2 = clib_host_to_net_u16 (1152);
601 : o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
602 : }
603 : }
604 :
605 : /*
606 : * If server ip address is available with non-zero value,
607 : * option 54 (DHCP Server Identifier) is sent.
608 : */
609 13 : if (c->learned.dhcp_server.as_u32)
610 : {
611 7 : o->option = 54;
612 7 : o->length = 4;
613 7 : clib_memcpy (o->data, &c->learned.dhcp_server.as_u32, 4);
614 7 : o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
615 : }
616 :
617 : /* send option 50, requested IP address */
618 13 : if (c->learned.leased_address.as_u32)
619 : {
620 7 : o->option = 50;
621 7 : o->length = 4;
622 7 : clib_memcpy (o->data, &c->learned.leased_address.as_u32, 4);
623 7 : o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
624 : }
625 :
626 : /* send option 12, host name */
627 13 : if (vec_len (c->hostname))
628 : {
629 13 : o->option = 12;
630 13 : o->length = vec_len (c->hostname);
631 13 : clib_memcpy (o->data, c->hostname, vec_len (c->hostname));
632 13 : o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
633 : }
634 :
635 : /* send option 61, client_id */
636 13 : if (vec_len (c->client_identifier))
637 : {
638 2 : o->option = 61;
639 2 : o->length = vec_len (c->client_identifier) + 1;
640 : /* Set type to zero, apparently some dhcp servers care */
641 2 : o->data[0] = 0;
642 2 : clib_memcpy (o->data + 1, c->client_identifier,
643 : vec_len (c->client_identifier));
644 2 : o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
645 : }
646 :
647 : /* $$ maybe send the client s/w version if anyone cares */
648 :
649 : /*
650 : * send option 55, parameter request list
651 : * The current list - see below, matches the Linux dhcp client's list
652 : * Any specific dhcp server config and/or dhcp server may or may
653 : * not yield specific options.
654 : */
655 13 : o->option = 55;
656 13 : o->length = vec_len (c->option_55_data);
657 13 : clib_memcpy (o->data, c->option_55_data, vec_len (c->option_55_data));
658 13 : o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
659 :
660 : /* End of list */
661 13 : o->option = 0xff;
662 13 : o->length = 0;
663 13 : o++;
664 :
665 13 : b->current_length = ((u8 *) o) - b->data;
666 :
667 : /* fix ip length, checksum and udp length */
668 13 : ip_length = vlib_buffer_length_in_chain (vm, b);
669 :
670 13 : ip->length = clib_host_to_net_u16 (ip_length);
671 13 : ip->checksum = ip4_header_checksum (ip);
672 :
673 13 : udp_length = ip_length - (sizeof (*ip));
674 13 : udp->length = clib_host_to_net_u16 (udp_length);
675 :
676 13 : switch (type)
677 : {
678 : #define _(a,b) case DHCP_PACKET_##a: {counter_index = DHCP_STAT_##a; break;}
679 13 : foreach_dhcp_sent_packet_stat
680 : #undef _
681 0 : default:
682 0 : counter_index = DHCP_STAT_UNKNOWN;
683 0 : break;
684 : }
685 :
686 13 : vlib_node_increment_counter (vm, dhcp_client_process_node.index,
687 : counter_index, 1);
688 : }
689 :
690 : static int
691 7 : dhcp_discover_state (dhcp_client_main_t * dcm, dhcp_client_t * c, f64 now)
692 : {
693 : /*
694 : * State machine "DISCOVER" state. Send a dhcp discover packet,
695 : * eventually back off the retry rate.
696 : */
697 : /*
698 : * In order to accept any OFFER, whether broadcasted or unicasted, we
699 : * need to configure the dhcp-client-detect feature as an input feature
700 : * so the DHCP OFFER is sent to the ip4-local node. Without this a
701 : * broadcasted OFFER hits the 255.255.255.255/32 address and a unicast
702 : * hits 0.0.0.0/0 both of which default to drop and the latter may forward
703 : * of box - not what we want. Nor to we want to change these route for
704 : * all interfaces in this table
705 : */
706 7 : if (c->client_detect_feature_enabled == 0)
707 : {
708 6 : vlib_worker_thread_barrier_sync (dcm->vlib_main);
709 6 : vnet_feature_enable_disable ("ip4-unicast",
710 : "ip4-dhcp-client-detect",
711 : c->sw_if_index, 1 /* enable */ , 0, 0);
712 6 : vlib_worker_thread_barrier_release (dcm->vlib_main);
713 6 : c->client_detect_feature_enabled = 1;
714 : }
715 :
716 7 : send_dhcp_pkt (dcm, c, DHCP_PACKET_DISCOVER, 1 /* is_broadcast */ );
717 :
718 7 : c->retry_count++;
719 7 : if (c->retry_count > 10)
720 0 : c->next_transmit = now + 5.0;
721 : else
722 7 : c->next_transmit = now + 1.0;
723 7 : return 0;
724 : }
725 :
726 : static int
727 4 : dhcp_request_state (dhcp_client_main_t * dcm, dhcp_client_t * c, f64 now)
728 : {
729 : /*
730 : * State machine "REQUEST" state. Send a dhcp request packet,
731 : * eventually drop back to the discover state.
732 : */
733 4 : DHCP_INFO ("enter request: %U", format_dhcp_client, dcm, c,
734 : 1 /*verbose */ );
735 :
736 4 : send_dhcp_pkt (dcm, c, DHCP_PACKET_REQUEST, 1 /* is_broadcast */ );
737 :
738 4 : c->retry_count++;
739 4 : if (c->retry_count > 7 /* lucky you */ )
740 : {
741 0 : c->state = DHCP_DISCOVER;
742 0 : c->next_transmit = now;
743 0 : c->retry_count = 0;
744 0 : return 1;
745 : }
746 4 : c->next_transmit = now + 1.0;
747 4 : return 0;
748 : }
749 :
750 : static int
751 4 : dhcp_bound_state (dhcp_client_main_t * dcm, dhcp_client_t * c, f64 now)
752 : {
753 : /*
754 : * We disable the client detect feature when we bind a
755 : * DHCP address. Turn it back on again on first renew attempt.
756 : * Otherwise, if the DHCP server replies we'll never see it.
757 : */
758 4 : if (c->client_detect_feature_enabled == 0)
759 : {
760 2 : vlib_worker_thread_barrier_sync (dcm->vlib_main);
761 2 : vnet_feature_enable_disable ("ip4-unicast",
762 : "ip4-dhcp-client-detect",
763 : c->sw_if_index, 1 /* enable */ , 0, 0);
764 2 : vlib_worker_thread_barrier_release (dcm->vlib_main);
765 2 : c->client_detect_feature_enabled = 1;
766 : }
767 :
768 : /*
769 : * State machine "BOUND" state. Send a dhcp request packet to renew
770 : * the lease.
771 : * Eventually, when the lease expires, forget the dhcp data
772 : * and go back to the stone age.
773 : */
774 4 : if (now > c->lease_expires)
775 : {
776 1 : DHCP_INFO ("lease expired: %U", format_dhcp_client, dcm, c,
777 : 1 /*verbose */ );
778 :
779 : /* reset all data for the client. do not send any more messages
780 : * since the objects to do so have been lost */
781 1 : dhcp_client_reset (dcm, c);
782 1 : return 1;
783 : }
784 :
785 3 : DHCP_INFO ("enter bound: %U", format_dhcp_client, dcm, c, 1 /* verbose */ );
786 3 : send_dhcp_pkt (dcm, c, DHCP_PACKET_REQUEST, 0 /* is_broadcast */ );
787 :
788 3 : c->retry_count++;
789 3 : if (c->retry_count > 10)
790 0 : c->next_transmit = now + 5.0;
791 : else
792 3 : c->next_transmit = now + 1.0;
793 :
794 3 : return 0;
795 : }
796 :
797 : static f64
798 25 : dhcp_client_sm (f64 now, f64 timeout, uword pool_index)
799 : {
800 25 : dhcp_client_main_t *dcm = &dhcp_client_main;
801 : dhcp_client_t *c;
802 :
803 : /* deleted, pooched, yadda yadda yadda */
804 25 : if (pool_is_free_index (dcm->clients, pool_index))
805 0 : return timeout;
806 :
807 25 : c = pool_elt_at_index (dcm->clients, pool_index);
808 :
809 : /* Time for us to do something with this client? */
810 25 : if (now < c->next_transmit)
811 11 : return c->next_transmit;
812 :
813 14 : DHCP_INFO ("sm active session %d", c - dcm->clients);
814 :
815 15 : again:
816 15 : switch (c->state)
817 : {
818 7 : case DHCP_DISCOVER: /* send a discover */
819 7 : if (dhcp_discover_state (dcm, c, now))
820 0 : goto again;
821 7 : break;
822 :
823 4 : case DHCP_REQUEST: /* send a request */
824 4 : if (dhcp_request_state (dcm, c, now))
825 0 : goto again;
826 4 : break;
827 :
828 4 : case DHCP_BOUND: /* bound, renew needed? */
829 4 : if (dhcp_bound_state (dcm, c, now))
830 1 : goto again;
831 3 : break;
832 :
833 0 : default:
834 0 : clib_warning ("dhcp client %d bogus state %d",
835 : c - dcm->clients, c->state);
836 0 : break;
837 : }
838 :
839 14 : return c->next_transmit;
840 : }
841 :
842 : static uword
843 575 : dhcp_client_process (vlib_main_t * vm,
844 : vlib_node_runtime_t * rt, vlib_frame_t * f)
845 : {
846 575 : f64 timeout = 1000.0;
847 : f64 next_expire_time, this_next_expire_time;
848 : f64 now;
849 : uword event_type;
850 575 : uword *event_data = 0;
851 575 : dhcp_client_main_t *dcm = &dhcp_client_main;
852 : dhcp_client_t *c;
853 : int i;
854 :
855 : while (1)
856 : {
857 596 : vlib_process_wait_for_event_or_clock (vm, timeout);
858 :
859 21 : event_type = vlib_process_get_events (vm, &event_data);
860 :
861 21 : now = vlib_time_now (vm);
862 :
863 21 : switch (event_type)
864 : {
865 9 : case EVENT_DHCP_CLIENT_WAKEUP:
866 18 : for (i = 0; i < vec_len (event_data); i++)
867 9 : (void) dhcp_client_sm (now, timeout, event_data[i]);
868 : /* FALLTHROUGH */
869 :
870 : case ~0:
871 21 : if (pool_elts (dcm->clients))
872 : {
873 : /* *INDENT-OFF* */
874 16 : next_expire_time = 1e70;
875 32 : pool_foreach (c, dcm->clients)
876 : {
877 16 : this_next_expire_time = dhcp_client_sm
878 16 : (now, timeout, (uword) (c - dcm->clients));
879 16 : next_expire_time = this_next_expire_time < next_expire_time ?
880 16 : this_next_expire_time : next_expire_time;
881 : }
882 16 : if (next_expire_time > now)
883 16 : timeout = next_expire_time - now;
884 : else
885 : {
886 0 : clib_warning ("BUG");
887 0 : timeout = 1.13;
888 : }
889 : /* *INDENT-ON* */
890 : }
891 : else
892 5 : timeout = 1000.0;
893 21 : break;
894 : }
895 :
896 21 : vec_reset_length (event_data);
897 : }
898 :
899 : /* NOTREACHED */
900 : return 0;
901 : }
902 :
903 : /* *INDENT-OFF* */
904 153836 : VLIB_REGISTER_NODE (dhcp_client_process_node,static) = {
905 : .function = dhcp_client_process,
906 : .type = VLIB_NODE_TYPE_PROCESS,
907 : .name = "dhcp-client-process",
908 : .process_log2_n_stack_bytes = 16,
909 : .n_errors = ARRAY_LEN(dhcp_client_process_stat_strings),
910 : .error_strings = dhcp_client_process_stat_strings,
911 : };
912 : /* *INDENT-ON* */
913 :
914 : static clib_error_t *
915 1 : show_dhcp_client_command_fn (vlib_main_t * vm,
916 : unformat_input_t * input,
917 : vlib_cli_command_t * cmd)
918 : {
919 1 : dhcp_client_main_t *dcm = &dhcp_client_main;
920 : dhcp_client_t *c;
921 1 : int verbose = 0;
922 1 : u32 sw_if_index = ~0;
923 : uword *p;
924 :
925 3 : while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
926 : {
927 2 : if (unformat (input, "intfc %U",
928 : unformat_vnet_sw_interface, dcm->vnet_main, &sw_if_index))
929 : ;
930 1 : else if (unformat (input, "verbose"))
931 1 : verbose = 1;
932 : else
933 0 : break;
934 : }
935 :
936 1 : if (sw_if_index != ~0)
937 : {
938 1 : p = hash_get (dcm->client_by_sw_if_index, sw_if_index);
939 1 : if (p == 0)
940 0 : return clib_error_return (0, "dhcp client not configured");
941 1 : c = pool_elt_at_index (dcm->clients, p[0]);
942 1 : vlib_cli_output (vm, "%U", format_dhcp_client, dcm, c, verbose);
943 1 : return 0;
944 : }
945 :
946 : /* *INDENT-OFF* */
947 0 : pool_foreach (c, dcm->clients)
948 : {
949 0 : vlib_cli_output (vm, "%U",
950 : format_dhcp_client, dcm,
951 : c, verbose);
952 : }
953 : /* *INDENT-ON* */
954 :
955 0 : return 0;
956 : }
957 :
958 : /* *INDENT-OFF* */
959 235753 : VLIB_CLI_COMMAND (show_dhcp_client_command, static) = {
960 : .path = "show dhcp client",
961 : .short_help = "show dhcp client [intfc <intfc>][verbose]",
962 : .function = show_dhcp_client_command_fn,
963 : };
964 : /* *INDENT-ON* */
965 :
966 :
967 : int
968 10 : dhcp_client_add_del (dhcp_client_add_del_args_t * a)
969 : {
970 10 : dhcp_client_main_t *dcm = &dhcp_client_main;
971 10 : vlib_main_t *vm = dcm->vlib_main;
972 : dhcp_client_t *c;
973 : uword *p;
974 :
975 10 : p = hash_get (dcm->client_by_sw_if_index, a->sw_if_index);
976 :
977 10 : if ((p && a->is_add) || (!p && a->is_add == 0))
978 0 : return VNET_API_ERROR_INVALID_VALUE;
979 :
980 10 : if (a->is_add)
981 : {
982 5 : dhcp_maybe_register_udp_ports (DHCP_PORT_REG_CLIENT);
983 5 : pool_get (dcm->clients, c);
984 5 : clib_memset (c, 0, sizeof (*c));
985 5 : c->state = DHCP_DISCOVER;
986 5 : c->sw_if_index = a->sw_if_index;
987 5 : c->client_index = a->client_index;
988 5 : c->pid = a->pid;
989 5 : c->event_callback = a->event_callback;
990 5 : c->option_55_data = a->option_55_data;
991 5 : c->hostname = a->hostname;
992 5 : c->client_identifier = a->client_identifier;
993 5 : c->set_broadcast_flag = a->set_broadcast_flag;
994 5 : c->dscp = a->dscp;
995 5 : c->ai_bcast = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
996 : VNET_LINK_IP4,
997 5 : &ADJ_BCAST_ADDR, c->sw_if_index);
998 :
999 : do
1000 : {
1001 5 : c->transaction_id = random_u32 (&dcm->seed);
1002 : }
1003 5 : while (c->transaction_id == 0);
1004 :
1005 5 : hash_set (dcm->client_by_sw_if_index, a->sw_if_index, c - dcm->clients);
1006 :
1007 5 : vlib_process_signal_event (vm, dhcp_client_process_node.index,
1008 5 : EVENT_DHCP_CLIENT_WAKEUP, c - dcm->clients);
1009 :
1010 5 : DHCP_INFO ("create: %U", format_dhcp_client, dcm, c, 1 /* verbose */ );
1011 : }
1012 : else
1013 : {
1014 5 : c = pool_elt_at_index (dcm->clients, p[0]);
1015 :
1016 5 : dhcp_client_reset (dcm, c);
1017 :
1018 5 : adj_unlock (c->ai_bcast);
1019 :
1020 5 : vec_free (c->domain_server_address);
1021 5 : vec_free (c->option_55_data);
1022 5 : vec_free (c->hostname);
1023 5 : vec_free (c->client_identifier);
1024 5 : hash_unset (dcm->client_by_sw_if_index, c->sw_if_index);
1025 5 : pool_put (dcm->clients, c);
1026 : }
1027 10 : return 0;
1028 : }
1029 :
1030 : int
1031 10 : dhcp_client_config (u32 is_add,
1032 : u32 client_index,
1033 : vlib_main_t * vm,
1034 : u32 sw_if_index,
1035 : u8 * hostname,
1036 : u8 * client_id,
1037 : dhcp_event_cb_t event_callback,
1038 : u8 set_broadcast_flag, ip_dscp_t dscp, u32 pid)
1039 : {
1040 10 : dhcp_client_add_del_args_t _a, *a = &_a;
1041 : int rv;
1042 :
1043 10 : clib_memset (a, 0, sizeof (*a));
1044 10 : a->is_add = is_add;
1045 10 : a->sw_if_index = sw_if_index;
1046 10 : a->client_index = client_index;
1047 10 : a->pid = pid;
1048 10 : a->event_callback = event_callback;
1049 10 : a->set_broadcast_flag = set_broadcast_flag;
1050 10 : a->dscp = dscp;
1051 10 : vec_validate (a->hostname, strlen ((char *) hostname) - 1);
1052 10 : strncpy ((char *) a->hostname, (char *) hostname, vec_len (a->hostname));
1053 10 : vec_validate (a->client_identifier, strlen ((char *) client_id) - 1);
1054 10 : strncpy ((char *) a->client_identifier, (char *) client_id,
1055 10 : vec_len (a->client_identifier));
1056 :
1057 : /*
1058 : * Option 55 request list. These data precisely match
1059 : * the Ubuntu dhcp client. YMMV.
1060 : */
1061 :
1062 : /* Subnet Mask */
1063 10 : vec_add1 (a->option_55_data, 1);
1064 : /* Broadcast address */
1065 10 : vec_add1 (a->option_55_data, 28);
1066 : /* time offset */
1067 10 : vec_add1 (a->option_55_data, 2);
1068 : /* Router */
1069 10 : vec_add1 (a->option_55_data, 3);
1070 : /* Domain Name */
1071 10 : vec_add1 (a->option_55_data, 15);
1072 : /* DNS */
1073 10 : vec_add1 (a->option_55_data, 6);
1074 : /* Domain search */
1075 10 : vec_add1 (a->option_55_data, 119);
1076 : /* Host name */
1077 10 : vec_add1 (a->option_55_data, 12);
1078 : /* NetBIOS name server */
1079 10 : vec_add1 (a->option_55_data, 44);
1080 : /* NetBIOS Scope */
1081 10 : vec_add1 (a->option_55_data, 47);
1082 : /* MTU */
1083 10 : vec_add1 (a->option_55_data, 26);
1084 : /* Classless static route */
1085 10 : vec_add1 (a->option_55_data, 121);
1086 : /* NTP servers */
1087 10 : vec_add1 (a->option_55_data, 42);
1088 :
1089 10 : rv = dhcp_client_add_del (a);
1090 :
1091 10 : switch (rv)
1092 : {
1093 10 : case 0:
1094 10 : break;
1095 :
1096 0 : case VNET_API_ERROR_INVALID_VALUE:
1097 :
1098 0 : vec_free (a->hostname);
1099 0 : vec_free (a->client_identifier);
1100 0 : vec_free (a->option_55_data);
1101 :
1102 0 : if (is_add)
1103 0 : DHCP_INFO ("dhcp client already enabled on intf_idx %d", sw_if_index);
1104 : else
1105 0 : DHCP_INFO ("not enabled on on intf_idx %d", sw_if_index);
1106 0 : break;
1107 :
1108 0 : default:
1109 0 : DHCP_INFO ("dhcp_client_add_del returned %d", rv);
1110 : }
1111 :
1112 10 : return rv;
1113 : }
1114 :
1115 : void
1116 10 : dhcp_client_walk (dhcp_client_walk_cb_t cb, void *ctx)
1117 : {
1118 10 : dhcp_client_main_t *dcm = &dhcp_client_main;
1119 : dhcp_client_t *c;
1120 :
1121 : /* *INDENT-OFF* */
1122 14 : pool_foreach (c, dcm->clients)
1123 : {
1124 4 : if (!cb(c, ctx))
1125 0 : break;
1126 : }
1127 : /* *INDENT-ON* */
1128 :
1129 10 : }
1130 :
1131 : static clib_error_t *
1132 0 : dhcp_client_set_command_fn (vlib_main_t * vm,
1133 : unformat_input_t * input,
1134 : vlib_cli_command_t * cmd)
1135 : {
1136 :
1137 0 : dhcp_client_main_t *dcm = &dhcp_client_main;
1138 : u32 sw_if_index;
1139 0 : u8 *hostname = 0;
1140 0 : u8 sw_if_index_set = 0;
1141 0 : u8 set_broadcast_flag = 1;
1142 0 : int is_add = 1;
1143 0 : dhcp_client_add_del_args_t _a, *a = &_a;
1144 : int rv;
1145 :
1146 0 : while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1147 : {
1148 0 : if (unformat (input, "intfc %U",
1149 : unformat_vnet_sw_interface, dcm->vnet_main, &sw_if_index))
1150 0 : sw_if_index_set = 1;
1151 0 : else if (unformat (input, "hostname %v", &hostname))
1152 : ;
1153 0 : else if (unformat (input, "del"))
1154 0 : is_add = 0;
1155 0 : else if (unformat (input, "broadcast", &set_broadcast_flag))
1156 0 : is_add = 0;
1157 : else
1158 0 : break;
1159 : }
1160 :
1161 0 : if (sw_if_index_set == 0)
1162 0 : return clib_error_return (0, "interface not specified");
1163 :
1164 0 : clib_memset (a, 0, sizeof (*a));
1165 0 : a->is_add = is_add;
1166 0 : a->sw_if_index = sw_if_index;
1167 0 : a->hostname = hostname;
1168 0 : a->client_identifier = format (0, "vpp 1.1%c", 0);
1169 0 : a->set_broadcast_flag = set_broadcast_flag;
1170 :
1171 : /*
1172 : * Option 55 request list. These data precisely match
1173 : * the Ubuntu dhcp client. YMMV.
1174 : */
1175 :
1176 : /* Subnet Mask */
1177 0 : vec_add1 (a->option_55_data, 1);
1178 : /* Broadcast address */
1179 0 : vec_add1 (a->option_55_data, 28);
1180 : /* time offset */
1181 0 : vec_add1 (a->option_55_data, 2);
1182 : /* Router */
1183 0 : vec_add1 (a->option_55_data, 3);
1184 : /* Domain Name */
1185 0 : vec_add1 (a->option_55_data, 15);
1186 : /* DNS */
1187 0 : vec_add1 (a->option_55_data, 6);
1188 : /* Domain search */
1189 0 : vec_add1 (a->option_55_data, 119);
1190 : /* Host name */
1191 0 : vec_add1 (a->option_55_data, 12);
1192 : /* NetBIOS name server */
1193 0 : vec_add1 (a->option_55_data, 44);
1194 : /* NetBIOS Scope */
1195 0 : vec_add1 (a->option_55_data, 47);
1196 : /* MTU */
1197 0 : vec_add1 (a->option_55_data, 26);
1198 : /* Classless static route */
1199 0 : vec_add1 (a->option_55_data, 121);
1200 : /* NTP servers */
1201 0 : vec_add1 (a->option_55_data, 42);
1202 :
1203 0 : rv = dhcp_client_add_del (a);
1204 :
1205 0 : switch (rv)
1206 : {
1207 0 : case 0:
1208 0 : break;
1209 :
1210 0 : case VNET_API_ERROR_INVALID_VALUE:
1211 :
1212 0 : vec_free (a->hostname);
1213 0 : vec_free (a->client_identifier);
1214 0 : vec_free (a->option_55_data);
1215 0 : if (is_add)
1216 0 : return clib_error_return (0, "dhcp client already enabled on %U",
1217 : format_vnet_sw_if_index_name,
1218 : dcm->vnet_main, sw_if_index);
1219 : else
1220 0 : return clib_error_return (0, "dhcp client not enabled on %U",
1221 : format_vnet_sw_if_index_name,
1222 : dcm->vnet_main, sw_if_index);
1223 : break;
1224 :
1225 0 : default:
1226 0 : vlib_cli_output (vm, "dhcp_client_add_del returned %d", rv);
1227 : }
1228 :
1229 0 : return 0;
1230 : }
1231 :
1232 : /* *INDENT-OFF* */
1233 235753 : VLIB_CLI_COMMAND (dhcp_client_set_command, static) = {
1234 : .path = "set dhcp client",
1235 : .short_help = "set dhcp client [del] intfc <interface> [hostname <name>]",
1236 : .function = dhcp_client_set_command_fn,
1237 : };
1238 : /* *INDENT-ON* */
1239 :
1240 : static clib_error_t *
1241 575 : dhcp_client_init (vlib_main_t * vm)
1242 : {
1243 575 : dhcp_client_main_t *dcm = &dhcp_client_main;
1244 : vlib_node_t *ip4_lookup_node;
1245 :
1246 575 : ip4_lookup_node = vlib_get_node_by_name (vm, (u8 *) "ip4-lookup");
1247 :
1248 : /* Should never happen... */
1249 575 : if (ip4_lookup_node == 0)
1250 0 : return clib_error_return (0, "ip4-lookup node not found");
1251 :
1252 575 : dcm->ip4_lookup_node_index = ip4_lookup_node->index;
1253 575 : dcm->vlib_main = vm;
1254 575 : dcm->vnet_main = vnet_get_main ();
1255 575 : dcm->seed = (u32) clib_cpu_time_now ();
1256 :
1257 575 : dhcp_logger = vlib_log_register_class ("dhcp", "client");
1258 575 : DHCP_DBG ("plugin initialized");
1259 :
1260 575 : return 0;
1261 : }
1262 :
1263 1151 : VLIB_INIT_FUNCTION (dhcp_client_init);
1264 :
1265 : /*
1266 : * fd.io coding-style-patch-verification: ON
1267 : *
1268 : * Local Variables:
1269 : * eval: (c-set-style "gnu")
1270 : * End:
1271 : */
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