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,
125 s = format (s, "\n broadcast adjacency:%d", c->ai_bcast);
131 dhcp_client_acquire_address (dhcp_client_main_t * dcm, dhcp_client_t * c)
134 * Install any/all info gleaned from dhcp, right here
136 if (!c->addresses_installed)
138 ip4_add_del_interface_address (dcm->vlib_main, c->sw_if_index,
139 (void *) &c->learned.leased_address,
140 c->learned.subnet_mask_width,
142 if (c->learned.router_address.as_u32)
144 fib_prefix_t all_0s = {
146 .fp_proto = FIB_PROTOCOL_IP4,
148 ip46_address_t nh = {
149 .ip4 = c->learned.router_address,
152 fib_table_entry_path_add (
153 fib_table_get_index_for_sw_if_index (
161 ~0, 1, NULL, // no label stack
162 FIB_ROUTE_PATH_FLAG_NONE);
165 clib_memcpy (&c->installed, &c->learned, sizeof (c->installed));
166 c->addresses_installed = 1;
170 dhcp_client_release_address (dhcp_client_main_t * dcm, dhcp_client_t * c)
173 * Remove any/all info gleaned from dhcp, right here. Caller(s)
174 * have not wiped out the info yet.
176 if (c->addresses_installed)
178 ip4_add_del_interface_address (dcm->vlib_main, c->sw_if_index,
179 (void *) &c->installed.leased_address,
180 c->installed.subnet_mask_width,
183 /* Remove the default route */
184 if (c->installed.router_address.as_u32)
186 fib_prefix_t all_0s = {
188 .fp_proto = FIB_PROTOCOL_IP4,
190 ip46_address_t nh = {
191 .ip4 = c->installed.router_address,
194 fib_table_entry_path_remove (fib_table_get_index_for_sw_if_index
195 (FIB_PROTOCOL_IP4, c->sw_if_index),
196 &all_0s, FIB_SOURCE_DHCP,
197 DPO_PROTO_IP4, &nh, c->sw_if_index, ~0,
198 1, FIB_ROUTE_PATH_FLAG_NONE);
201 clib_memset (&c->installed, 0, sizeof (c->installed));
202 c->addresses_installed = 0;
206 dhcp_client_proc_callback (uword * client_index)
208 vlib_main_t *vm = vlib_get_main ();
209 ASSERT (vlib_get_thread_index () == 0);
210 vlib_process_signal_event (vm, dhcp_client_process_node.index,
211 EVENT_DHCP_CLIENT_WAKEUP, *client_index);
215 dhcp_client_addr_callback (u32 * cindex)
217 dhcp_client_main_t *dcm = &dhcp_client_main;
220 c = pool_elt_at_index (dcm->clients, *cindex);
222 /* disable the feature */
223 vnet_feature_enable_disable ("ip4-unicast",
224 "ip4-dhcp-client-detect",
225 c->sw_if_index, 0 /* disable */ , 0, 0);
226 c->client_detect_feature_enabled = 0;
228 /* add the address to the interface if they've changed since the last time */
229 if (0 != clib_memcmp (&c->installed, &c->learned, sizeof (c->learned)))
231 dhcp_client_release_address (dcm, c);
232 dhcp_client_acquire_address (dcm, c);
236 * Call the user's event callback to report DHCP information
238 if (c->event_callback)
239 c->event_callback (c->client_index, c);
241 DHCP_INFO ("update: %U", format_dhcp_client, dcm, c, 1 /* verbose */ );
245 dhcp_client_reset (dhcp_client_main_t * dcm, dhcp_client_t * c)
247 vlib_worker_thread_barrier_sync (dcm->vlib_main);
248 if (c->client_detect_feature_enabled == 1)
250 vnet_feature_enable_disable ("ip4-unicast",
251 "ip4-dhcp-client-detect",
252 c->sw_if_index, 0, 0, 0);
253 c->client_detect_feature_enabled = 0;
255 dhcp_client_release_address (dcm, c);
256 vlib_worker_thread_barrier_release (dcm->vlib_main);
258 clib_memset (&c->learned, 0, sizeof (c->installed));
259 c->state = DHCP_DISCOVER;
260 c->next_transmit = vlib_time_now (dcm->vlib_main);
262 c->lease_renewal_interval = 0;
263 vec_free (c->domain_server_address);
267 * dhcp_client_for_us - server-to-client callback.
268 * Called from proxy_node.c:dhcp_proxy_to_client_input().
269 * This function first decides that the packet in question is
270 * actually for the dhcp client code in case we're also acting as
271 * a dhcp proxy. Ay caramba, what a folly!
274 dhcp_client_for_us (u32 bi, vlib_buffer_t * b,
276 udp_header_t * udp, dhcp_header_t * dhcp)
278 dhcp_client_main_t *dcm = &dhcp_client_main;
279 vlib_main_t *vm = vlib_get_main ();
282 f64 now = vlib_time_now (vm);
283 u8 dhcp_message_type = 0;
287 * Doing dhcp client on this interface?
288 * Presumably we will always receive dhcp clnt for-us pkts on
289 * the interface that's asking for an address.
291 p = hash_get (dcm->client_by_sw_if_index,
292 vnet_buffer (b)->sw_if_index[VLIB_RX]);
296 c = pool_elt_at_index (dcm->clients, p[0]);
298 /* Mixing dhcp relay and dhcp proxy? DGMS... */
299 if (c->state == DHCP_BOUND && c->retry_count == 0)
302 /* Packet not for us? Turf it... */
303 if (memcmp (dhcp->client_hardware_address, c->client_hardware_address,
304 sizeof (c->client_hardware_address)))
306 vlib_node_increment_counter (vm, dhcp_client_process_node.index,
307 DHCP_STAT_NOT_FOR_US, 1);
311 /* parse through the packet, learn what we can */
312 if (dhcp->your_ip_address.as_u32)
313 c->learned.leased_address.as_u32 = dhcp->your_ip_address.as_u32;
315 c->learned.dhcp_server.as_u32 = dhcp->server_ip_address.as_u32;
317 o = (dhcp_option_t *) dhcp->options;
319 while (o->option != 0xFF /* end of options */ &&
320 (u8 *) o < (b->data + b->current_data + b->current_length))
324 case 53: /* dhcp message type */
325 dhcp_message_type = o->data[0];
328 case 51: /* lease time */
330 u32 lease_time_in_seconds =
331 clib_host_to_net_u32 (o->data_as_u32[0]);
332 // for debug: lease_time_in_seconds = 20; /*$$$$*/
333 c->lease_expires = now + (f64) lease_time_in_seconds;
334 c->lease_lifetime = lease_time_in_seconds;
335 /* Set a sensible default, in case we don't get opt 58 */
336 c->lease_renewal_interval = lease_time_in_seconds / 2;
340 case 58: /* lease renew time in seconds */
342 u32 lease_renew_time_in_seconds =
343 clib_host_to_net_u32 (o->data_as_u32[0]);
344 c->lease_renewal_interval = lease_renew_time_in_seconds;
348 case 54: /* dhcp server address */
349 c->learned.dhcp_server.as_u32 = o->data_as_u32[0];
352 case 1: /* subnet mask */
354 u32 subnet_mask = clib_host_to_net_u32 (o->data_as_u32[0]);
355 c->learned.subnet_mask_width = count_set_bits (subnet_mask);
358 case 3: /* router address */
360 u32 router_address = o->data_as_u32[0];
361 c->learned.router_address.as_u32 = router_address;
364 case 6: /* domain server address */
366 vec_free (c->domain_server_address);
367 vec_validate (c->domain_server_address,
368 o->length / sizeof (ip4_address_t) - 1);
369 clib_memcpy (c->domain_server_address, o->data, o->length);
372 case 12: /* hostname */
374 /* Replace the existing hostname if necessary */
375 vec_free (c->hostname);
376 vec_validate (c->hostname, o->length - 1);
377 clib_memcpy (c->hostname, o->data, o->length);
381 /* $$$$ Your message in this space, parse more options */
386 o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
392 if (dhcp_message_type != DHCP_PACKET_OFFER)
394 vlib_node_increment_counter (vm, dhcp_client_process_node.index,
395 DHCP_STAT_NON_OFFER_DISCOVER, 1);
396 c->next_transmit = now + 5.0;
400 /* Received an offer, go send a request */
401 c->state = DHCP_REQUEST;
403 c->next_transmit = 0; /* send right now... */
404 /* Poke the client process, which will send the request */
405 uword client_id = c - dcm->clients;
406 vl_api_rpc_call_main_thread (dhcp_client_proc_callback,
407 (u8 *) & client_id, sizeof (uword));
412 if (dhcp_message_type == DHCP_PACKET_NAK)
414 vlib_node_increment_counter (vm, dhcp_client_process_node.index,
416 /* Probably never happens in bound state, but anyhow...
417 Wipe out any memory of the address we had... */
418 dhcp_client_reset (dcm, c);
422 if (dhcp_message_type != DHCP_PACKET_ACK &&
423 dhcp_message_type != DHCP_PACKET_OFFER)
425 vlib_node_increment_counter (vm, dhcp_client_process_node.index,
426 DHCP_STAT_NON_OFFER_DISCOVER, 1);
427 clib_warning ("sw_if_index %d state %U message type %d",
428 c->sw_if_index, format_dhcp_client_state,
429 c->state, dhcp_message_type);
430 c->next_transmit = now + 5.0;
433 /* OK, we own the address (etc), add to the routing table(s) */
435 /* Send the index over to the main thread, where it can retrieve
436 * the original client */
437 u32 cindex = c - dcm->clients;
438 vl_api_force_rpc_call_main_thread (dhcp_client_addr_callback,
439 (u8 *) & cindex, sizeof (u32));
442 c->state = DHCP_BOUND;
444 c->next_transmit = now + (f64) c->lease_renewal_interval;
445 c->lease_expires = now + (f64) c->lease_lifetime;
446 vlib_node_increment_counter (vm, dhcp_client_process_node.index,
451 clib_warning ("client %d bogus state %d", c - dcm->clients, c->state);
455 /* return 1 so the call disposes of this packet */
460 send_dhcp_pkt (dhcp_client_main_t * dcm, dhcp_client_t * c,
461 dhcp_packet_type_t type, int is_broadcast)
463 vlib_main_t *vm = dcm->vlib_main;
464 vnet_main_t *vnm = dcm->vnet_main;
465 vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, c->sw_if_index);
466 vnet_sw_interface_t *sup_sw
467 = vnet_get_sup_sw_interface (vnm, c->sw_if_index);
468 vnet_sw_interface_t *sw = vnet_get_sw_interface (vnm, c->sw_if_index);
477 u16 udp_length, ip_length;
478 u32 counter_index, node_index;
480 DHCP_INFO ("send: type:%U bcast:%d %U",
481 format_dhcp_packet_type, type,
482 is_broadcast, format_dhcp_client, dcm, c, 1 /* verbose */ );
484 /* Interface(s) down? */
485 if ((hw->flags & VNET_HW_INTERFACE_FLAG_LINK_UP) == 0)
487 if ((sup_sw->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) == 0)
489 if ((sw->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) == 0)
492 if (vlib_buffer_alloc (vm, &bi, 1) != 1)
494 clib_warning ("buffer allocation failure");
495 c->next_transmit = 0;
499 /* Build a dhcpv4 pkt from whole cloth */
500 b = vlib_get_buffer (vm, bi);
502 ASSERT (b->current_data == 0);
504 vnet_buffer (b)->sw_if_index[VLIB_RX] = c->sw_if_index;
505 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
509 node_index = ip4_rewrite_node.index;
510 vnet_buffer (b)->ip.adj_index[VLIB_TX] = c->ai_bcast;
513 node_index = dcm->ip4_lookup_node_index;
515 /* Enqueue the packet right now */
516 f = vlib_get_frame_to_node (vm, node_index);
517 to_next = vlib_frame_vector_args (f);
520 vlib_put_frame_to_node (vm, node_index, f);
522 /* build the headers */
523 ip = vlib_buffer_get_current (b);
524 udp = (udp_header_t *) (ip + 1);
525 dhcp = (dhcp_header_t *) (udp + 1);
527 /* $$$ optimize, maybe */
528 clib_memset (ip, 0, sizeof (*ip) + sizeof (*udp) + sizeof (*dhcp));
530 ip->ip_version_and_header_length = 0x45;
532 ip->protocol = IP_PROTOCOL_UDP;
539 * Setup the buffer's QoS settings so any QoS marker on the egress
540 * interface, that might set VLAN CoS bits, based on this DSCP setting
542 vnet_buffer2 (b)->qos.source = QOS_SOURCE_IP;
543 vnet_buffer2 (b)->qos.bits = ip->tos;
544 b->flags |= VNET_BUFFER_F_QOS_DATA_VALID;
549 /* src = 0.0.0.0, dst = 255.255.255.255 */
550 ip->dst_address.as_u32 = ~0;
554 /* Renewing an active lease, plain old ip4 src/dst */
555 ip->src_address.as_u32 = c->learned.leased_address.as_u32;
556 ip->dst_address.as_u32 = c->learned.dhcp_server.as_u32;
559 udp->src_port = clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client);
560 udp->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_server);
562 /* Send the interface MAC address */
563 clib_memcpy (dhcp->client_hardware_address,
564 vnet_sw_interface_get_hw_address (vnm, c->sw_if_index), 6);
566 /* And remember it for rx-packet-for-us checking */
567 clib_memcpy (c->client_hardware_address, dhcp->client_hardware_address,
568 sizeof (c->client_hardware_address));
570 /* Lease renewal, set up client_ip_address */
571 if (is_broadcast == 0)
572 dhcp->client_ip_address.as_u32 = c->learned.leased_address.as_u32;
574 dhcp->opcode = 1; /* request, all we send */
575 dhcp->hardware_type = 1; /* ethernet */
576 dhcp->hardware_address_length = 6;
577 dhcp->transaction_identifier = c->transaction_id;
579 clib_host_to_net_u16 (is_broadcast && c->set_broadcast_flag ?
580 DHCP_FLAG_BROADCAST : 0);
581 dhcp->magic_cookie.as_u32 = DHCP_MAGIC;
583 o = (dhcp_option_t *) dhcp->options;
585 /* Send option 53, the DHCP message type */
586 o->option = DHCP_PACKET_OPTION_MSG_TYPE;
589 o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
591 /* Send option 57, max msg length */
592 if (0 /* not needed, apparently */ )
597 u16 *o2 = (u16 *) o->data;
598 *o2 = clib_host_to_net_u16 (1152);
599 o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
604 * If server ip address is available with non-zero value,
605 * option 54 (DHCP Server Identifier) is sent.
607 if (c->learned.dhcp_server.as_u32)
611 clib_memcpy (o->data, &c->learned.dhcp_server.as_u32, 4);
612 o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
615 /* send option 50, requested IP address */
616 if (c->learned.leased_address.as_u32)
620 clib_memcpy (o->data, &c->learned.leased_address.as_u32, 4);
621 o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
624 /* send option 12, host name */
625 if (vec_len (c->hostname))
628 o->length = vec_len (c->hostname);
629 clib_memcpy (o->data, c->hostname, vec_len (c->hostname));
630 o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
633 /* send option 61, client_id */
634 if (vec_len (c->client_identifier))
637 o->length = vec_len (c->client_identifier) + 1;
638 /* Set type to zero, apparently some dhcp servers care */
640 clib_memcpy (o->data + 1, c->client_identifier,
641 vec_len (c->client_identifier));
642 o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
645 /* $$ maybe send the client s/w version if anyone cares */
648 * send option 55, parameter request list
649 * The current list - see below, matches the Linux dhcp client's list
650 * Any specific dhcp server config and/or dhcp server may or may
651 * not yield specific options.
654 o->length = vec_len (c->option_55_data);
655 clib_memcpy (o->data, c->option_55_data, vec_len (c->option_55_data));
656 o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
663 b->current_length = ((u8 *) o) - b->data;
665 /* fix ip length, checksum and udp length */
666 ip_length = vlib_buffer_length_in_chain (vm, b);
668 ip->length = clib_host_to_net_u16 (ip_length);
669 ip->checksum = ip4_header_checksum (ip);
671 udp_length = ip_length - (sizeof (*ip));
672 udp->length = clib_host_to_net_u16 (udp_length);
676 #define _(a,b) case DHCP_PACKET_##a: {counter_index = DHCP_STAT_##a; break;}
677 foreach_dhcp_sent_packet_stat
680 counter_index = DHCP_STAT_UNKNOWN;
684 vlib_node_increment_counter (vm, dhcp_client_process_node.index,
689 dhcp_discover_state (dhcp_client_main_t * dcm, dhcp_client_t * c, f64 now)
692 * State machine "DISCOVER" state. Send a dhcp discover packet,
693 * eventually back off the retry rate.
696 * In order to accept any OFFER, whether broadcasted or unicasted, we
697 * need to configure the dhcp-client-detect feature as an input feature
698 * so the DHCP OFFER is sent to the ip4-local node. Without this a
699 * broadcasted OFFER hits the 255.255.255.255/32 address and a unicast
700 * hits 0.0.0.0/0 both of which default to drop and the latter may forward
701 * of box - not what we want. Nor to we want to change these route for
702 * all interfaces in this table
704 if (c->client_detect_feature_enabled == 0)
706 vlib_worker_thread_barrier_sync (dcm->vlib_main);
707 vnet_feature_enable_disable ("ip4-unicast",
708 "ip4-dhcp-client-detect",
709 c->sw_if_index, 1 /* enable */ , 0, 0);
710 vlib_worker_thread_barrier_release (dcm->vlib_main);
711 c->client_detect_feature_enabled = 1;
714 send_dhcp_pkt (dcm, c, DHCP_PACKET_DISCOVER, 1 /* is_broadcast */ );
717 if (c->retry_count > 10)
718 c->next_transmit = now + 5.0;
720 c->next_transmit = now + 1.0;
725 dhcp_request_state (dhcp_client_main_t * dcm, dhcp_client_t * c, f64 now)
728 * State machine "REQUEST" state. Send a dhcp request packet,
729 * eventually drop back to the discover state.
731 DHCP_INFO ("enter request: %U", format_dhcp_client, dcm, c,
734 send_dhcp_pkt (dcm, c, DHCP_PACKET_REQUEST, 1 /* is_broadcast */ );
737 if (c->retry_count > 7 /* lucky you */ )
739 c->state = DHCP_DISCOVER;
740 c->next_transmit = now;
744 c->next_transmit = now + 1.0;
749 dhcp_bound_state (dhcp_client_main_t * dcm, dhcp_client_t * c, f64 now)
752 * We disable the client detect feature when we bind a
753 * DHCP address. Turn it back on again on first renew attempt.
754 * Otherwise, if the DHCP server replies we'll never see it.
756 if (c->client_detect_feature_enabled == 0)
758 vlib_worker_thread_barrier_sync (dcm->vlib_main);
759 vnet_feature_enable_disable ("ip4-unicast",
760 "ip4-dhcp-client-detect",
761 c->sw_if_index, 1 /* enable */ , 0, 0);
762 vlib_worker_thread_barrier_release (dcm->vlib_main);
763 c->client_detect_feature_enabled = 1;
767 * State machine "BOUND" state. Send a dhcp request packet to renew
769 * Eventually, when the lease expires, forget the dhcp data
770 * and go back to the stone age.
772 if (now > c->lease_expires)
774 DHCP_INFO ("lease expired: %U", format_dhcp_client, dcm, c,
777 /* reset all data for the client. do not send any more messages
778 * since the objects to do so have been lost */
779 dhcp_client_reset (dcm, c);
783 DHCP_INFO ("enter bound: %U", format_dhcp_client, dcm, c, 1 /* verbose */ );
784 send_dhcp_pkt (dcm, c, DHCP_PACKET_REQUEST, 0 /* is_broadcast */ );
787 if (c->retry_count > 10)
788 c->next_transmit = now + 5.0;
790 c->next_transmit = now + 1.0;
796 dhcp_client_sm (f64 now, f64 timeout, uword pool_index)
798 dhcp_client_main_t *dcm = &dhcp_client_main;
801 /* deleted, pooched, yadda yadda yadda */
802 if (pool_is_free_index (dcm->clients, pool_index))
805 c = pool_elt_at_index (dcm->clients, pool_index);
807 /* Time for us to do something with this client? */
808 if (now < c->next_transmit)
809 return c->next_transmit;
811 DHCP_INFO ("sm active session %d", c - dcm->clients);
816 case DHCP_DISCOVER: /* send a discover */
817 if (dhcp_discover_state (dcm, c, now))
821 case DHCP_REQUEST: /* send a request */
822 if (dhcp_request_state (dcm, c, now))
826 case DHCP_BOUND: /* bound, renew needed? */
827 if (dhcp_bound_state (dcm, c, now))
832 clib_warning ("dhcp client %d bogus state %d",
833 c - dcm->clients, c->state);
837 return c->next_transmit;
841 dhcp_client_process (vlib_main_t * vm,
842 vlib_node_runtime_t * rt, vlib_frame_t * f)
844 f64 timeout = 1000.0;
845 f64 next_expire_time, this_next_expire_time;
848 uword *event_data = 0;
849 dhcp_client_main_t *dcm = &dhcp_client_main;
855 vlib_process_wait_for_event_or_clock (vm, timeout);
857 event_type = vlib_process_get_events (vm, &event_data);
859 now = vlib_time_now (vm);
863 case EVENT_DHCP_CLIENT_WAKEUP:
864 for (i = 0; i < vec_len (event_data); i++)
865 (void) dhcp_client_sm (now, timeout, event_data[i]);
869 if (pool_elts (dcm->clients))
871 next_expire_time = 1e70;
872 pool_foreach (c, dcm->clients)
874 this_next_expire_time = dhcp_client_sm
875 (now, timeout, (uword) (c - dcm->clients));
876 next_expire_time = this_next_expire_time < next_expire_time ?
877 this_next_expire_time : next_expire_time;
879 if (next_expire_time > now)
880 timeout = next_expire_time - now;
883 clib_warning ("BUG");
892 vec_reset_length (event_data);
899 VLIB_REGISTER_NODE (dhcp_client_process_node,static) = {
900 .function = dhcp_client_process,
901 .type = VLIB_NODE_TYPE_PROCESS,
902 .name = "dhcp-client-process",
903 .process_log2_n_stack_bytes = 16,
904 .n_errors = ARRAY_LEN(dhcp_client_process_stat_strings),
905 .error_strings = dhcp_client_process_stat_strings,
908 static clib_error_t *
909 show_dhcp_client_command_fn (vlib_main_t * vm,
910 unformat_input_t * input,
911 vlib_cli_command_t * cmd)
913 dhcp_client_main_t *dcm = &dhcp_client_main;
916 u32 sw_if_index = ~0;
919 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
921 if (unformat (input, "intfc %U",
922 unformat_vnet_sw_interface, dcm->vnet_main, &sw_if_index))
924 else if (unformat (input, "verbose"))
930 if (sw_if_index != ~0)
932 p = hash_get (dcm->client_by_sw_if_index, sw_if_index);
934 return clib_error_return (0, "dhcp client not configured");
935 c = pool_elt_at_index (dcm->clients, p[0]);
936 vlib_cli_output (vm, "%U", format_dhcp_client, dcm, c, verbose);
940 pool_foreach (c, dcm->clients)
942 vlib_cli_output (vm, "%U",
943 format_dhcp_client, dcm,
950 VLIB_CLI_COMMAND (show_dhcp_client_command, static) = {
951 .path = "show dhcp client",
952 .short_help = "show dhcp client [intfc <intfc>][verbose]",
953 .function = show_dhcp_client_command_fn,
958 dhcp_client_add_del (dhcp_client_add_del_args_t * a)
960 dhcp_client_main_t *dcm = &dhcp_client_main;
961 vlib_main_t *vm = dcm->vlib_main;
965 p = hash_get (dcm->client_by_sw_if_index, a->sw_if_index);
967 if ((p && a->is_add) || (!p && a->is_add == 0))
968 return VNET_API_ERROR_INVALID_VALUE;
972 dhcp_maybe_register_udp_ports (DHCP_PORT_REG_CLIENT);
973 pool_get (dcm->clients, c);
974 clib_memset (c, 0, sizeof (*c));
975 c->state = DHCP_DISCOVER;
976 c->sw_if_index = a->sw_if_index;
977 c->client_index = a->client_index;
979 c->event_callback = a->event_callback;
980 c->option_55_data = a->option_55_data;
981 c->hostname = a->hostname;
982 c->client_identifier = a->client_identifier;
983 c->set_broadcast_flag = a->set_broadcast_flag;
985 c->ai_bcast = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
987 &ADJ_BCAST_ADDR, c->sw_if_index);
991 c->transaction_id = random_u32 (&dcm->seed);
993 while (c->transaction_id == 0);
995 hash_set (dcm->client_by_sw_if_index, a->sw_if_index, c - dcm->clients);
997 vlib_process_signal_event (vm, dhcp_client_process_node.index,
998 EVENT_DHCP_CLIENT_WAKEUP, c - dcm->clients);
1000 DHCP_INFO ("create: %U", format_dhcp_client, dcm, c, 1 /* verbose */ );
1004 c = pool_elt_at_index (dcm->clients, p[0]);
1006 dhcp_client_reset (dcm, c);
1008 adj_unlock (c->ai_bcast);
1010 vec_free (c->domain_server_address);
1011 vec_free (c->option_55_data);
1012 vec_free (c->hostname);
1013 vec_free (c->client_identifier);
1014 hash_unset (dcm->client_by_sw_if_index, c->sw_if_index);
1015 pool_put (dcm->clients, c);
1021 dhcp_client_config (u32 is_add,
1027 dhcp_event_cb_t event_callback,
1028 u8 set_broadcast_flag, ip_dscp_t dscp, u32 pid)
1030 dhcp_client_add_del_args_t _a, *a = &_a;
1033 clib_memset (a, 0, sizeof (*a));
1035 a->sw_if_index = sw_if_index;
1036 a->client_index = client_index;
1038 a->event_callback = event_callback;
1039 a->set_broadcast_flag = set_broadcast_flag;
1041 vec_validate (a->hostname, strlen ((char *) hostname) - 1);
1042 strncpy ((char *) a->hostname, (char *) hostname, vec_len (a->hostname));
1043 vec_validate (a->client_identifier, strlen ((char *) client_id) - 1);
1044 strncpy ((char *) a->client_identifier, (char *) client_id,
1045 vec_len (a->client_identifier));
1048 * Option 55 request list. These data precisely match
1049 * the Ubuntu dhcp client. YMMV.
1053 vec_add1 (a->option_55_data, 1);
1054 /* Broadcast address */
1055 vec_add1 (a->option_55_data, 28);
1057 vec_add1 (a->option_55_data, 2);
1059 vec_add1 (a->option_55_data, 3);
1061 vec_add1 (a->option_55_data, 15);
1063 vec_add1 (a->option_55_data, 6);
1065 vec_add1 (a->option_55_data, 119);
1067 vec_add1 (a->option_55_data, 12);
1068 /* NetBIOS name server */
1069 vec_add1 (a->option_55_data, 44);
1071 vec_add1 (a->option_55_data, 47);
1073 vec_add1 (a->option_55_data, 26);
1074 /* Classless static route */
1075 vec_add1 (a->option_55_data, 121);
1077 vec_add1 (a->option_55_data, 42);
1079 rv = dhcp_client_add_del (a);
1086 case VNET_API_ERROR_INVALID_VALUE:
1088 vec_free (a->hostname);
1089 vec_free (a->client_identifier);
1090 vec_free (a->option_55_data);
1093 DHCP_INFO ("dhcp client already enabled on intf_idx %d", sw_if_index);
1095 DHCP_INFO ("not enabled on on intf_idx %d", sw_if_index);
1099 DHCP_INFO ("dhcp_client_add_del returned %d", rv);
1106 dhcp_client_walk (dhcp_client_walk_cb_t cb, void *ctx)
1108 dhcp_client_main_t *dcm = &dhcp_client_main;
1111 pool_foreach (c, dcm->clients)
1119 static clib_error_t *
1120 dhcp_client_set_command_fn (vlib_main_t * vm,
1121 unformat_input_t * input,
1122 vlib_cli_command_t * cmd)
1125 dhcp_client_main_t *dcm = &dhcp_client_main;
1128 u8 sw_if_index_set = 0;
1129 u8 set_broadcast_flag = 1;
1131 dhcp_client_add_del_args_t _a, *a = &_a;
1134 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1136 if (unformat (input, "intfc %U",
1137 unformat_vnet_sw_interface, dcm->vnet_main, &sw_if_index))
1138 sw_if_index_set = 1;
1139 else if (unformat (input, "hostname %v", &hostname))
1141 else if (unformat (input, "del"))
1143 else if (unformat (input, "broadcast", &set_broadcast_flag))
1149 if (sw_if_index_set == 0)
1150 return clib_error_return (0, "interface not specified");
1152 clib_memset (a, 0, sizeof (*a));
1154 a->sw_if_index = sw_if_index;
1155 a->hostname = hostname;
1156 a->client_identifier = format (0, "vpp 1.1%c", 0);
1157 a->set_broadcast_flag = set_broadcast_flag;
1160 * Option 55 request list. These data precisely match
1161 * the Ubuntu dhcp client. YMMV.
1165 vec_add1 (a->option_55_data, 1);
1166 /* Broadcast address */
1167 vec_add1 (a->option_55_data, 28);
1169 vec_add1 (a->option_55_data, 2);
1171 vec_add1 (a->option_55_data, 3);
1173 vec_add1 (a->option_55_data, 15);
1175 vec_add1 (a->option_55_data, 6);
1177 vec_add1 (a->option_55_data, 119);
1179 vec_add1 (a->option_55_data, 12);
1180 /* NetBIOS name server */
1181 vec_add1 (a->option_55_data, 44);
1183 vec_add1 (a->option_55_data, 47);
1185 vec_add1 (a->option_55_data, 26);
1186 /* Classless static route */
1187 vec_add1 (a->option_55_data, 121);
1189 vec_add1 (a->option_55_data, 42);
1191 rv = dhcp_client_add_del (a);
1198 case VNET_API_ERROR_INVALID_VALUE:
1200 vec_free (a->hostname);
1201 vec_free (a->client_identifier);
1202 vec_free (a->option_55_data);
1204 return clib_error_return (0, "dhcp client already enabled on %U",
1205 format_vnet_sw_if_index_name,
1206 dcm->vnet_main, sw_if_index);
1208 return clib_error_return (0, "dhcp client not enabled on %U",
1209 format_vnet_sw_if_index_name,
1210 dcm->vnet_main, sw_if_index);
1214 vlib_cli_output (vm, "dhcp_client_add_del returned %d", rv);
1220 VLIB_CLI_COMMAND (dhcp_client_set_command, static) = {
1221 .path = "set dhcp client",
1222 .short_help = "set dhcp client [del] intfc <interface> [hostname <name>]",
1223 .function = dhcp_client_set_command_fn,
1226 static clib_error_t *
1227 dhcp_client_init (vlib_main_t * vm)
1229 dhcp_client_main_t *dcm = &dhcp_client_main;
1230 vlib_node_t *ip4_lookup_node;
1232 ip4_lookup_node = vlib_get_node_by_name (vm, (u8 *) "ip4-lookup");
1234 /* Should never happen... */
1235 if (ip4_lookup_node == 0)
1236 return clib_error_return (0, "ip4-lookup node not found");
1238 dcm->ip4_lookup_node_index = ip4_lookup_node->index;
1239 dcm->vlib_main = vm;
1240 dcm->vnet_main = vnet_get_main ();
1241 dcm->seed = (u32) clib_cpu_time_now ();
1243 dhcp_logger = vlib_log_register_class ("dhcp", "client");
1244 DHCP_DBG ("plugin initialized");
1249 VLIB_INIT_FUNCTION (dhcp_client_init);
1252 * fd.io coding-style-patch-verification: ON
1255 * eval: (c-set-style "gnu")