2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
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>
22 vlib_log_class_t dhcp_logger;
24 dhcp_client_main_t dhcp_client_main;
25 static vlib_node_registration_t dhcp_client_process_node;
27 #define DHCP_DBG(...) \
28 vlib_log_debug (dhcp_logger, __VA_ARGS__);
30 #define DHCP_INFO(...) \
31 vlib_log_notice (dhcp_logger, __VA_ARGS__);
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")
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")
48 #define _(sym,str) DHCP_STAT_##sym,
49 foreach_dhcp_sent_packet_stat foreach_dhcp_error_counter
55 static char *dhcp_client_process_stat_strings[] = {
56 #define _(sym,string) string,
57 foreach_dhcp_sent_packet_stat foreach_dhcp_error_counter
59 "DHCP unknown packets sent",
63 format_dhcp_client_state (u8 * s, va_list * va)
65 dhcp_client_state_t state = va_arg (*va, dhcp_client_state_t);
74 foreach_dhcp_client_state;
80 s = format (s, "%s", str);
85 format_dhcp_client (u8 * s, va_list * va)
87 dhcp_client_main_t *dcm = va_arg (*va, dhcp_client_main_t *);
88 dhcp_client_t *c = va_arg (*va, dhcp_client_t *);
89 int verbose = va_arg (*va, int);
92 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 format_dhcp_client_state, c->state, c->addresses_installed);
97 s = format (s, " dscp %d", c->dscp);
99 if (c->installed.leased_address.as_u32)
101 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);
107 vec_foreach (addr, c->domain_server_address)
108 s = format (s, " dns %U", format_ip4_address, addr);
112 s = format (s, " no address");
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));
123 format (s, "\n retry-count:%d, next-xmt:%.2f", c->retry_count,
126 format (s, "\n adjacencies:[unicast:%d broadcast:%d]", c->ai_ucast,
133 dhcp_client_acquire_address (dhcp_client_main_t * dcm, dhcp_client_t * c)
136 * Install any/all info gleaned from dhcp, right here
138 if (!c->addresses_installed)
140 ip4_add_del_interface_address (dcm->vlib_main, c->sw_if_index,
141 (void *) &c->learned.leased_address,
142 c->learned.subnet_mask_width,
144 if (c->learned.router_address.as_u32)
146 fib_prefix_t all_0s = {
148 .fp_proto = FIB_PROTOCOL_IP4,
150 ip46_address_t nh = {
151 .ip4 = c->learned.router_address,
155 fib_table_entry_path_add (
156 fib_table_get_index_for_sw_if_index (
164 ~0, 1, NULL, // no label stack
165 FIB_ROUTE_PATH_FLAG_NONE);
168 if (c->learned.dhcp_server.as_u32)
170 ip46_address_t dst = {
171 .ip4 = c->learned.dhcp_server,
173 c->ai_ucast = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
178 clib_memcpy (&c->installed, &c->learned, sizeof (c->installed));
179 c->addresses_installed = 1;
183 dhcp_client_release_address (dhcp_client_main_t * dcm, dhcp_client_t * c)
186 * Remove any/all info gleaned from dhcp, right here. Caller(s)
187 * have not wiped out the info yet.
189 if (c->addresses_installed)
191 ip4_add_del_interface_address (dcm->vlib_main, c->sw_if_index,
192 (void *) &c->installed.leased_address,
193 c->installed.subnet_mask_width,
196 /* Remove the default route */
197 if (c->installed.router_address.as_u32)
199 fib_prefix_t all_0s = {
201 .fp_proto = FIB_PROTOCOL_IP4,
203 ip46_address_t nh = {
204 .ip4 = c->installed.router_address,
207 fib_table_entry_path_remove (fib_table_get_index_for_sw_if_index
208 (FIB_PROTOCOL_IP4, c->sw_if_index),
209 &all_0s, FIB_SOURCE_DHCP,
210 DPO_PROTO_IP4, &nh, c->sw_if_index, ~0,
211 1, FIB_ROUTE_PATH_FLAG_NONE);
213 adj_unlock (c->ai_ucast);
214 c->ai_ucast = ADJ_INDEX_INVALID;
216 clib_memset (&c->installed, 0, sizeof (c->installed));
217 c->addresses_installed = 0;
221 dhcp_client_proc_callback (uword * client_index)
223 vlib_main_t *vm = vlib_get_main ();
224 ASSERT (vlib_get_thread_index () == 0);
225 vlib_process_signal_event (vm, dhcp_client_process_node.index,
226 EVENT_DHCP_CLIENT_WAKEUP, *client_index);
230 dhcp_client_addr_callback (u32 * cindex)
232 dhcp_client_main_t *dcm = &dhcp_client_main;
235 c = pool_elt_at_index (dcm->clients, *cindex);
237 /* disable the feature */
238 vnet_feature_enable_disable ("ip4-unicast",
239 "ip4-dhcp-client-detect",
240 c->sw_if_index, 0 /* disable */ , 0, 0);
241 c->client_detect_feature_enabled = 0;
243 /* add the address to the interface if they've changed since the last time */
244 if (0 != clib_memcmp (&c->installed, &c->learned, sizeof (c->learned)))
246 dhcp_client_release_address (dcm, c);
247 dhcp_client_acquire_address (dcm, c);
251 * Call the user's event callback to report DHCP information
253 if (c->event_callback)
254 c->event_callback (c->client_index, c);
256 DHCP_INFO ("update: %U", format_dhcp_client, dcm, c);
260 dhcp_client_reset (dhcp_client_main_t * dcm, dhcp_client_t * c)
262 if (c->client_detect_feature_enabled == 1)
264 vnet_feature_enable_disable ("ip4-unicast",
265 "ip4-dhcp-client-detect",
266 c->sw_if_index, 0, 0, 0);
267 c->client_detect_feature_enabled = 0;
270 dhcp_client_release_address (dcm, c);
271 clib_memset (&c->learned, 0, sizeof (c->installed));
272 c->state = DHCP_DISCOVER;
273 c->next_transmit = vlib_time_now (dcm->vlib_main);
275 c->lease_renewal_interval = 0;
276 vec_free (c->domain_server_address);
280 * dhcp_client_for_us - server-to-client callback.
281 * Called from proxy_node.c:dhcp_proxy_to_client_input().
282 * This function first decides that the packet in question is
283 * actually for the dhcp client code in case we're also acting as
284 * a dhcp proxy. Ay caramba, what a folly!
287 dhcp_client_for_us (u32 bi, vlib_buffer_t * b,
289 udp_header_t * udp, dhcp_header_t * dhcp)
291 dhcp_client_main_t *dcm = &dhcp_client_main;
292 vlib_main_t *vm = dcm->vlib_main;
295 f64 now = vlib_time_now (dcm->vlib_main);
296 u8 dhcp_message_type = 0;
300 * Doing dhcp client on this interface?
301 * Presumably we will always receive dhcp clnt for-us pkts on
302 * the interface that's asking for an address.
304 p = hash_get (dcm->client_by_sw_if_index,
305 vnet_buffer (b)->sw_if_index[VLIB_RX]);
309 c = pool_elt_at_index (dcm->clients, p[0]);
311 /* Mixing dhcp relay and dhcp proxy? DGMS... */
312 if (c->state == DHCP_BOUND && c->retry_count == 0)
315 /* Packet not for us? Turf it... */
316 if (memcmp (dhcp->client_hardware_address, c->client_hardware_address,
317 sizeof (c->client_hardware_address)))
319 vlib_node_increment_counter (vm, dhcp_client_process_node.index,
320 DHCP_STAT_NOT_FOR_US, 1);
324 /* parse through the packet, learn what we can */
325 if (dhcp->your_ip_address.as_u32)
326 c->learned.leased_address.as_u32 = dhcp->your_ip_address.as_u32;
328 c->learned.dhcp_server.as_u32 = dhcp->server_ip_address.as_u32;
330 o = (dhcp_option_t *) dhcp->options;
332 while (o->option != 0xFF /* end of options */ &&
333 (u8 *) o < (b->data + b->current_data + b->current_length))
337 case 53: /* dhcp message type */
338 dhcp_message_type = o->data[0];
341 case 51: /* lease time */
343 u32 lease_time_in_seconds =
344 clib_host_to_net_u32 (o->data_as_u32[0]);
345 // for debug: lease_time_in_seconds = 20; /*$$$$*/
346 c->lease_expires = now + (f64) lease_time_in_seconds;
347 c->lease_lifetime = lease_time_in_seconds;
348 /* Set a sensible default, in case we don't get opt 58 */
349 c->lease_renewal_interval = lease_time_in_seconds / 2;
353 case 58: /* lease renew time in seconds */
355 u32 lease_renew_time_in_seconds =
356 clib_host_to_net_u32 (o->data_as_u32[0]);
357 c->lease_renewal_interval = lease_renew_time_in_seconds;
361 case 54: /* dhcp server address */
362 c->learned.dhcp_server.as_u32 = o->data_as_u32[0];
365 case 1: /* subnet mask */
367 u32 subnet_mask = clib_host_to_net_u32 (o->data_as_u32[0]);
368 c->learned.subnet_mask_width = count_set_bits (subnet_mask);
371 case 3: /* router address */
373 u32 router_address = o->data_as_u32[0];
374 c->learned.router_address.as_u32 = router_address;
377 case 6: /* domain server address */
379 vec_free (c->domain_server_address);
380 vec_validate (c->domain_server_address,
381 o->length / sizeof (ip4_address_t) - 1);
382 clib_memcpy (c->domain_server_address, o->data, o->length);
385 case 12: /* hostname */
387 /* Replace the existing hostname if necessary */
388 vec_free (c->hostname);
389 vec_validate (c->hostname, o->length - 1);
390 clib_memcpy (c->hostname, o->data, o->length);
394 /* $$$$ Your message in this space, parse more options */
399 o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
405 if (dhcp_message_type != DHCP_PACKET_OFFER)
407 vlib_node_increment_counter (vm, dhcp_client_process_node.index,
408 DHCP_STAT_NON_OFFER_DISCOVER, 1);
409 c->next_transmit = now + 5.0;
413 /* Received an offer, go send a request */
414 c->state = DHCP_REQUEST;
416 c->next_transmit = 0; /* send right now... */
417 /* Poke the client process, which will send the request */
418 uword client_id = c - dcm->clients;
419 vl_api_rpc_call_main_thread (dhcp_client_proc_callback,
420 (u8 *) & client_id, sizeof (uword));
425 if (dhcp_message_type == DHCP_PACKET_NAK)
427 vlib_node_increment_counter (vm, dhcp_client_process_node.index,
429 /* Probably never happens in bound state, but anyhow...
430 Wipe out any memory of the address we had... */
431 dhcp_client_reset (dcm, c);
435 if (dhcp_message_type != DHCP_PACKET_ACK &&
436 dhcp_message_type != DHCP_PACKET_OFFER)
438 vlib_node_increment_counter (vm, dhcp_client_process_node.index,
439 DHCP_STAT_NON_OFFER_DISCOVER, 1);
440 clib_warning ("sw_if_index %d state %U message type %d",
441 c->sw_if_index, format_dhcp_client_state,
442 c->state, dhcp_message_type);
443 c->next_transmit = now + 5.0;
446 /* OK, we own the address (etc), add to the routing table(s) */
448 /* Send the index over to the main thread, where it can retrieve
449 * the original client */
450 u32 cindex = c - dcm->clients;
451 vl_api_force_rpc_call_main_thread (dhcp_client_addr_callback,
452 (u8 *) & cindex, sizeof (u32));
455 c->state = DHCP_BOUND;
457 c->next_transmit = now + (f64) c->lease_renewal_interval;
458 c->lease_expires = now + (f64) c->lease_lifetime;
459 vlib_node_increment_counter (vm, dhcp_client_process_node.index,
464 clib_warning ("client %d bogus state %d", c - dcm->clients, c->state);
468 /* return 1 so the call disposes of this packet */
473 send_dhcp_pkt (dhcp_client_main_t * dcm, dhcp_client_t * c,
474 dhcp_packet_type_t type, int is_broadcast)
476 vlib_main_t *vm = dcm->vlib_main;
477 vnet_main_t *vnm = dcm->vnet_main;
478 vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, c->sw_if_index);
479 vnet_sw_interface_t *sup_sw
480 = vnet_get_sup_sw_interface (vnm, c->sw_if_index);
481 vnet_sw_interface_t *sw = vnet_get_sw_interface (vnm, c->sw_if_index);
490 u16 udp_length, ip_length;
491 u32 counter_index, node_index;
493 DHCP_INFO ("send: type:%U bcast:%d %U",
494 format_dhcp_packet_type, type,
495 is_broadcast, format_dhcp_client, dcm, c);
497 /* Interface(s) down? */
498 if ((hw->flags & VNET_HW_INTERFACE_FLAG_LINK_UP) == 0)
500 if ((sup_sw->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) == 0)
502 if ((sw->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) == 0)
505 if (vlib_buffer_alloc (vm, &bi, 1) != 1)
507 clib_warning ("buffer allocation failure");
508 c->next_transmit = 0;
512 /* Build a dhcpv4 pkt from whole cloth */
513 b = vlib_get_buffer (vm, bi);
514 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
516 ASSERT (b->current_data == 0);
518 vnet_buffer (b)->sw_if_index[VLIB_RX] = c->sw_if_index;
520 if (ADJ_INDEX_INVALID == c->ai_ucast)
525 node_index = ip4_rewrite_node.index;
526 vnet_buffer (b)->ip.adj_index[VLIB_TX] = c->ai_bcast;
530 ip_adjacency_t *adj = adj_get (c->ai_ucast);
532 if (IP_LOOKUP_NEXT_ARP == adj->lookup_next_index)
533 node_index = ip4_arp_node.index;
535 node_index = ip4_rewrite_node.index;
536 vnet_buffer (b)->ip.adj_index[VLIB_TX] = c->ai_ucast;
539 /* Enqueue the packet right now */
540 f = vlib_get_frame_to_node (vm, node_index);
541 to_next = vlib_frame_vector_args (f);
544 vlib_put_frame_to_node (vm, node_index, f);
546 /* build the headers */
547 ip = vlib_buffer_get_current (b);
548 udp = (udp_header_t *) (ip + 1);
549 dhcp = (dhcp_header_t *) (udp + 1);
551 /* $$$ optimize, maybe */
552 clib_memset (ip, 0, sizeof (*ip) + sizeof (*udp) + sizeof (*dhcp));
554 ip->ip_version_and_header_length = 0x45;
556 ip->protocol = IP_PROTOCOL_UDP;
563 * Setup the buffer's QoS settings so any QoS marker on the egress
564 * interface, that might set VLAN CoS bits, based on this DSCP setting
566 vnet_buffer2 (b)->qos.source = QOS_SOURCE_IP;
567 vnet_buffer2 (b)->qos.bits = ip->tos;
568 b->flags |= VNET_BUFFER_F_QOS_DATA_VALID;
573 /* src = 0.0.0.0, dst = 255.255.255.255 */
574 ip->dst_address.as_u32 = ~0;
578 /* Renewing an active lease, plain old ip4 src/dst */
579 ip->src_address.as_u32 = c->learned.leased_address.as_u32;
580 ip->dst_address.as_u32 = c->learned.dhcp_server.as_u32;
583 udp->src_port = clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client);
584 udp->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_server);
586 /* Send the interface MAC address */
587 clib_memcpy (dhcp->client_hardware_address,
588 vnet_sw_interface_get_hw_address (vnm, c->sw_if_index), 6);
590 /* And remember it for rx-packet-for-us checking */
591 clib_memcpy (c->client_hardware_address, dhcp->client_hardware_address,
592 sizeof (c->client_hardware_address));
594 /* Lease renewal, set up client_ip_address */
595 if (is_broadcast == 0)
596 dhcp->client_ip_address.as_u32 = c->learned.leased_address.as_u32;
598 dhcp->opcode = 1; /* request, all we send */
599 dhcp->hardware_type = 1; /* ethernet */
600 dhcp->hardware_address_length = 6;
601 dhcp->transaction_identifier = c->transaction_id;
603 clib_host_to_net_u16 (is_broadcast && c->set_broadcast_flag ?
604 DHCP_FLAG_BROADCAST : 0);
605 dhcp->magic_cookie.as_u32 = DHCP_MAGIC;
607 o = (dhcp_option_t *) dhcp->options;
609 /* Send option 53, the DHCP message type */
610 o->option = DHCP_PACKET_OPTION_MSG_TYPE;
613 o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
615 /* Send option 57, max msg length */
616 if (0 /* not needed, apparently */ )
621 u16 *o2 = (u16 *) o->data;
622 *o2 = clib_host_to_net_u16 (1152);
623 o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
628 * If server ip address is available with non-zero value,
629 * option 54 (DHCP Server Identifier) is sent.
631 if (c->learned.dhcp_server.as_u32)
635 clib_memcpy (o->data, &c->learned.dhcp_server.as_u32, 4);
636 o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
639 /* send option 50, requested IP address */
640 if (c->learned.leased_address.as_u32)
644 clib_memcpy (o->data, &c->learned.leased_address.as_u32, 4);
645 o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
648 /* send option 12, host name */
649 if (vec_len (c->hostname))
652 o->length = vec_len (c->hostname);
653 clib_memcpy (o->data, c->hostname, vec_len (c->hostname));
654 o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
657 /* send option 61, client_id */
658 if (vec_len (c->client_identifier))
661 o->length = vec_len (c->client_identifier) + 1;
662 /* Set type to zero, apparently some dhcp servers care */
664 clib_memcpy (o->data + 1, c->client_identifier,
665 vec_len (c->client_identifier));
666 o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
669 /* $$ maybe send the client s/w version if anyone cares */
672 * send option 55, parameter request list
673 * The current list - see below, matches the Linux dhcp client's list
674 * Any specific dhcp server config and/or dhcp server may or may
675 * not yield specific options.
678 o->length = vec_len (c->option_55_data);
679 clib_memcpy (o->data, c->option_55_data, vec_len (c->option_55_data));
680 o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
687 b->current_length = ((u8 *) o) - b->data;
689 /* fix ip length, checksum and udp length */
690 ip_length = vlib_buffer_length_in_chain (vm, b);
692 ip->length = clib_host_to_net_u16 (ip_length);
693 ip->checksum = ip4_header_checksum (ip);
695 udp_length = ip_length - (sizeof (*ip));
696 udp->length = clib_host_to_net_u16 (udp_length);
700 #define _(a,b) case DHCP_PACKET_##a: {counter_index = DHCP_STAT_##a; break;}
701 foreach_dhcp_sent_packet_stat
704 counter_index = DHCP_STAT_UNKNOWN;
708 vlib_node_increment_counter (vm, dhcp_client_process_node.index,
713 dhcp_discover_state (dhcp_client_main_t * dcm, dhcp_client_t * c, f64 now)
716 * State machine "DISCOVER" state. Send a dhcp discover packet,
717 * eventually back off the retry rate.
719 DHCP_INFO ("enter discover: %U", format_dhcp_client, dcm, c);
722 * In order to accept any OFFER, whether broadcasted or unicasted, we
723 * need to configure the dhcp-client-detect feature as an input feature
724 * so the DHCP OFFER is sent to the ip4-local node. Without this a
725 * broadcasted OFFER hits the 255.255.255.255/32 address and a unicast
726 * hits 0.0.0.0/0 both of which default to drop and the latter may forward
727 * of box - not what we want. Nor to we want to change these route for
728 * all interfaces in this table
730 if (c->client_detect_feature_enabled == 0)
732 vnet_feature_enable_disable ("ip4-unicast",
733 "ip4-dhcp-client-detect",
734 c->sw_if_index, 1 /* enable */ , 0, 0);
735 c->client_detect_feature_enabled = 1;
738 send_dhcp_pkt (dcm, c, DHCP_PACKET_DISCOVER, 1 /* is_broadcast */ );
741 if (c->retry_count > 10)
742 c->next_transmit = now + 5.0;
744 c->next_transmit = now + 1.0;
749 dhcp_request_state (dhcp_client_main_t * dcm, dhcp_client_t * c, f64 now)
752 * State machine "REQUEST" state. Send a dhcp request packet,
753 * eventually drop back to the discover state.
755 DHCP_INFO ("enter request: %U", format_dhcp_client, dcm, c);
757 send_dhcp_pkt (dcm, c, DHCP_PACKET_REQUEST, 1 /* is_broadcast */ );
760 if (c->retry_count > 7 /* lucky you */ )
762 c->state = DHCP_DISCOVER;
763 c->next_transmit = now;
767 c->next_transmit = now + 1.0;
772 dhcp_bound_state (dhcp_client_main_t * dcm, dhcp_client_t * c, f64 now)
775 * We disable the client detect feature when we bind a
776 * DHCP address. Turn it back on again on first renew attempt.
777 * Otherwise, if the DHCP server replies we'll never see it.
779 if (c->client_detect_feature_enabled == 0)
781 vnet_feature_enable_disable ("ip4-unicast",
782 "ip4-dhcp-client-detect",
783 c->sw_if_index, 1 /* enable */ , 0, 0);
784 c->client_detect_feature_enabled = 1;
788 * State machine "BOUND" state. Send a dhcp request packet to renew
790 * Eventually, when the lease expires, forget the dhcp data
791 * and go back to the stone age.
793 if (now > c->lease_expires)
795 DHCP_INFO ("lease expired: %U", format_dhcp_client, dcm, c);
797 /* reset all data for the client. do not send any more messages
798 * since the objects to do so have been lost */
799 dhcp_client_reset (dcm, c);
803 DHCP_INFO ("enter bound: %U", format_dhcp_client, dcm, c);
804 send_dhcp_pkt (dcm, c, DHCP_PACKET_REQUEST, 0 /* is_broadcast */ );
807 if (c->retry_count > 10)
808 c->next_transmit = now + 5.0;
810 c->next_transmit = now + 1.0;
816 dhcp_client_sm (f64 now, f64 timeout, uword pool_index)
818 dhcp_client_main_t *dcm = &dhcp_client_main;
821 /* deleted, pooched, yadda yadda yadda */
822 if (pool_is_free_index (dcm->clients, pool_index))
825 c = pool_elt_at_index (dcm->clients, pool_index);
827 /* Time for us to do something with this client? */
828 if (now < c->next_transmit)
834 case DHCP_DISCOVER: /* send a discover */
835 if (dhcp_discover_state (dcm, c, now))
839 case DHCP_REQUEST: /* send a request */
840 if (dhcp_request_state (dcm, c, now))
844 case DHCP_BOUND: /* bound, renew needed? */
845 if (dhcp_bound_state (dcm, c, now))
850 clib_warning ("dhcp client %d bogus state %d",
851 c - dcm->clients, c->state);
855 if (c->next_transmit < now + timeout)
856 return c->next_transmit - now;
862 dhcp_client_process (vlib_main_t * vm,
863 vlib_node_runtime_t * rt, vlib_frame_t * f)
868 uword *event_data = 0;
869 dhcp_client_main_t *dcm = &dhcp_client_main;
875 vlib_process_wait_for_event_or_clock (vm, timeout);
877 event_type = vlib_process_get_events (vm, &event_data);
879 now = vlib_time_now (vm);
883 case EVENT_DHCP_CLIENT_WAKEUP:
884 for (i = 0; i < vec_len (event_data); i++)
885 timeout = dhcp_client_sm (now, timeout, event_data[i]);
890 DHCP_INFO ("timeout");
891 pool_foreach (c, dcm->clients,
893 timeout = dhcp_client_sm (now, timeout,
894 (uword) (c - dcm->clients));
897 if (pool_elts (dcm->clients) == 0)
902 vec_reset_length (event_data);
910 VLIB_REGISTER_NODE (dhcp_client_process_node,static) = {
911 .function = dhcp_client_process,
912 .type = VLIB_NODE_TYPE_PROCESS,
913 .name = "dhcp-client-process",
914 .process_log2_n_stack_bytes = 16,
915 .n_errors = ARRAY_LEN(dhcp_client_process_stat_strings),
916 .error_strings = dhcp_client_process_stat_strings,
920 static clib_error_t *
921 show_dhcp_client_command_fn (vlib_main_t * vm,
922 unformat_input_t * input,
923 vlib_cli_command_t * cmd)
925 dhcp_client_main_t *dcm = &dhcp_client_main;
928 u32 sw_if_index = ~0;
931 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
933 if (unformat (input, "intfc %U",
934 unformat_vnet_sw_interface, dcm->vnet_main, &sw_if_index))
936 else if (unformat (input, "verbose"))
942 if (sw_if_index != ~0)
944 p = hash_get (dcm->client_by_sw_if_index, sw_if_index);
946 return clib_error_return (0, "dhcp client not configured");
947 c = pool_elt_at_index (dcm->clients, p[0]);
948 vlib_cli_output (vm, "%U", format_dhcp_client, dcm, c, verbose);
953 pool_foreach (c, dcm->clients,
955 vlib_cli_output (vm, "%U",
956 format_dhcp_client, dcm,
965 VLIB_CLI_COMMAND (show_dhcp_client_command, static) = {
966 .path = "show dhcp client",
967 .short_help = "show dhcp client [intfc <intfc>][verbose]",
968 .function = show_dhcp_client_command_fn,
974 dhcp_client_add_del (dhcp_client_add_del_args_t * a)
976 dhcp_client_main_t *dcm = &dhcp_client_main;
977 vlib_main_t *vm = dcm->vlib_main;
981 p = hash_get (dcm->client_by_sw_if_index, a->sw_if_index);
983 if ((p && a->is_add) || (!p && a->is_add == 0))
984 return VNET_API_ERROR_INVALID_VALUE;
988 dhcp_maybe_register_udp_ports (DHCP_PORT_REG_CLIENT);
989 pool_get (dcm->clients, c);
990 clib_memset (c, 0, sizeof (*c));
991 c->state = DHCP_DISCOVER;
992 c->sw_if_index = a->sw_if_index;
993 c->client_index = a->client_index;
995 c->event_callback = a->event_callback;
996 c->option_55_data = a->option_55_data;
997 c->hostname = a->hostname;
998 c->client_identifier = a->client_identifier;
999 c->set_broadcast_flag = a->set_broadcast_flag;
1001 c->ai_ucast = ADJ_INDEX_INVALID;
1002 c->ai_bcast = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
1004 &ADJ_BCAST_ADDR, c->sw_if_index);
1008 c->transaction_id = random_u32 (&dcm->seed);
1010 while (c->transaction_id == 0);
1012 hash_set (dcm->client_by_sw_if_index, a->sw_if_index, c - dcm->clients);
1014 vlib_process_signal_event (vm, dhcp_client_process_node.index,
1015 EVENT_DHCP_CLIENT_WAKEUP, c - dcm->clients);
1017 DHCP_INFO ("create: %U", format_dhcp_client, dcm, c);
1021 c = pool_elt_at_index (dcm->clients, p[0]);
1023 dhcp_client_reset (dcm, c);
1025 adj_unlock (c->ai_bcast);
1027 vec_free (c->domain_server_address);
1028 vec_free (c->option_55_data);
1029 vec_free (c->hostname);
1030 vec_free (c->client_identifier);
1031 hash_unset (dcm->client_by_sw_if_index, c->sw_if_index);
1032 pool_put (dcm->clients, c);
1038 dhcp_client_config (u32 is_add,
1044 dhcp_event_cb_t event_callback,
1045 u8 set_broadcast_flag, ip_dscp_t dscp, u32 pid)
1047 dhcp_client_add_del_args_t _a, *a = &_a;
1050 clib_memset (a, 0, sizeof (*a));
1052 a->sw_if_index = sw_if_index;
1053 a->client_index = client_index;
1055 a->event_callback = event_callback;
1056 a->set_broadcast_flag = set_broadcast_flag;
1058 vec_validate (a->hostname, strlen ((char *) hostname) - 1);
1059 strncpy ((char *) a->hostname, (char *) hostname, vec_len (a->hostname));
1060 vec_validate (a->client_identifier, strlen ((char *) client_id) - 1);
1061 strncpy ((char *) a->client_identifier, (char *) client_id,
1062 vec_len (a->client_identifier));
1065 * Option 55 request list. These data precisely match
1066 * the Ubuntu dhcp client. YMMV.
1070 vec_add1 (a->option_55_data, 1);
1071 /* Broadcast address */
1072 vec_add1 (a->option_55_data, 28);
1074 vec_add1 (a->option_55_data, 2);
1076 vec_add1 (a->option_55_data, 3);
1078 vec_add1 (a->option_55_data, 15);
1080 vec_add1 (a->option_55_data, 6);
1082 vec_add1 (a->option_55_data, 119);
1084 vec_add1 (a->option_55_data, 12);
1085 /* NetBIOS name server */
1086 vec_add1 (a->option_55_data, 44);
1088 vec_add1 (a->option_55_data, 47);
1090 vec_add1 (a->option_55_data, 26);
1091 /* Classless static route */
1092 vec_add1 (a->option_55_data, 121);
1094 vec_add1 (a->option_55_data, 42);
1096 rv = dhcp_client_add_del (a);
1103 case VNET_API_ERROR_INVALID_VALUE:
1105 vec_free (a->hostname);
1106 vec_free (a->client_identifier);
1107 vec_free (a->option_55_data);
1110 clib_warning ("dhcp client already enabled on intf_idx %d",
1113 clib_warning ("dhcp client not enabled on on intf_idx %d",
1118 clib_warning ("dhcp_client_add_del returned %d", rv);
1125 dhcp_client_walk (dhcp_client_walk_cb_t cb, void *ctx)
1127 dhcp_client_main_t *dcm = &dhcp_client_main;
1131 pool_foreach (c, dcm->clients,
1140 static clib_error_t *
1141 dhcp_client_set_command_fn (vlib_main_t * vm,
1142 unformat_input_t * input,
1143 vlib_cli_command_t * cmd)
1146 dhcp_client_main_t *dcm = &dhcp_client_main;
1149 u8 sw_if_index_set = 0;
1150 u8 set_broadcast_flag = 1;
1152 dhcp_client_add_del_args_t _a, *a = &_a;
1155 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1157 if (unformat (input, "intfc %U",
1158 unformat_vnet_sw_interface, dcm->vnet_main, &sw_if_index))
1159 sw_if_index_set = 1;
1160 else if (unformat (input, "hostname %v", &hostname))
1162 else if (unformat (input, "del"))
1164 else if (unformat (input, "broadcast", &set_broadcast_flag))
1170 if (sw_if_index_set == 0)
1171 return clib_error_return (0, "interface not specified");
1173 clib_memset (a, 0, sizeof (*a));
1175 a->sw_if_index = sw_if_index;
1176 a->hostname = hostname;
1177 a->client_identifier = format (0, "vpp 1.1%c", 0);
1178 a->set_broadcast_flag = set_broadcast_flag;
1181 * Option 55 request list. These data precisely match
1182 * the Ubuntu dhcp client. YMMV.
1186 vec_add1 (a->option_55_data, 1);
1187 /* Broadcast address */
1188 vec_add1 (a->option_55_data, 28);
1190 vec_add1 (a->option_55_data, 2);
1192 vec_add1 (a->option_55_data, 3);
1194 vec_add1 (a->option_55_data, 15);
1196 vec_add1 (a->option_55_data, 6);
1198 vec_add1 (a->option_55_data, 119);
1200 vec_add1 (a->option_55_data, 12);
1201 /* NetBIOS name server */
1202 vec_add1 (a->option_55_data, 44);
1204 vec_add1 (a->option_55_data, 47);
1206 vec_add1 (a->option_55_data, 26);
1207 /* Classless static route */
1208 vec_add1 (a->option_55_data, 121);
1210 vec_add1 (a->option_55_data, 42);
1212 rv = dhcp_client_add_del (a);
1219 case VNET_API_ERROR_INVALID_VALUE:
1221 vec_free (a->hostname);
1222 vec_free (a->client_identifier);
1223 vec_free (a->option_55_data);
1225 return clib_error_return (0, "dhcp client already enabled on %U",
1226 format_vnet_sw_if_index_name,
1227 dcm->vnet_main, sw_if_index);
1229 return clib_error_return (0, "dhcp client not enabled on %U",
1230 format_vnet_sw_if_index_name,
1231 dcm->vnet_main, sw_if_index);
1235 vlib_cli_output (vm, "dhcp_client_add_del returned %d", rv);
1242 VLIB_CLI_COMMAND (dhcp_client_set_command, static) = {
1243 .path = "set dhcp client",
1244 .short_help = "set dhcp client [del] intfc <interface> [hostname <name>]",
1245 .function = dhcp_client_set_command_fn,
1249 static clib_error_t *
1250 dhcp_client_init (vlib_main_t * vm)
1252 dhcp_client_main_t *dcm = &dhcp_client_main;
1254 dcm->vlib_main = vm;
1255 dcm->vnet_main = vnet_get_main ();
1256 dcm->seed = (u32) clib_cpu_time_now ();
1258 dhcp_logger = vlib_log_register_class ("dhcp", "client");
1263 VLIB_INIT_FUNCTION (dhcp_client_init);
1266 * fd.io coding-style-patch-verification: ON
1269 * eval: (c-set-style "gnu")