17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate * CDDL HEADER START
37c478bd9Sstevel@tonic-gate *
47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5c2934490Sdh * Common Development and Distribution License (the "License").
6c2934490Sdh * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate *
87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate * and limitations under the License.
127c478bd9Sstevel@tonic-gate *
137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate *
197c478bd9Sstevel@tonic-gate * CDDL HEADER END
207c478bd9Sstevel@tonic-gate */
217c478bd9Sstevel@tonic-gate /*
220a3e1f6cSVasumathi Sundaram * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
23*b31320a7SChris Fraire * Copyright (c) 2016-2017, Chris Fraire <cfraire@me.com>.
247c478bd9Sstevel@tonic-gate *
257c478bd9Sstevel@tonic-gate * SELECTING state of the client state machine.
267c478bd9Sstevel@tonic-gate */
277c478bd9Sstevel@tonic-gate
287c478bd9Sstevel@tonic-gate #include <sys/types.h>
297c478bd9Sstevel@tonic-gate #include <stdio.h>
30cfb9c9abScarlsonj #include <stdlib.h>
317c478bd9Sstevel@tonic-gate #include <strings.h>
327c478bd9Sstevel@tonic-gate #include <time.h>
337c478bd9Sstevel@tonic-gate #include <netinet/in.h>
347c478bd9Sstevel@tonic-gate #include <net/route.h>
357c478bd9Sstevel@tonic-gate #include <net/if.h>
367c478bd9Sstevel@tonic-gate #include <netinet/dhcp.h>
377c478bd9Sstevel@tonic-gate #include <netinet/udp.h>
387c478bd9Sstevel@tonic-gate #include <netinet/ip_var.h>
397c478bd9Sstevel@tonic-gate #include <netinet/udp_var.h>
407c478bd9Sstevel@tonic-gate #include <dhcpmsg.h>
410a3e1f6cSVasumathi Sundaram #include <dhcp_hostconf.h>
427c478bd9Sstevel@tonic-gate
437c478bd9Sstevel@tonic-gate #include "states.h"
447c478bd9Sstevel@tonic-gate #include "agent.h"
457c478bd9Sstevel@tonic-gate #include "util.h"
467c478bd9Sstevel@tonic-gate #include "interface.h"
477c478bd9Sstevel@tonic-gate #include "packet.h"
487c478bd9Sstevel@tonic-gate #include "defaults.h"
497c478bd9Sstevel@tonic-gate
507c478bd9Sstevel@tonic-gate static stop_func_t stop_selecting;
517c478bd9Sstevel@tonic-gate
527c478bd9Sstevel@tonic-gate /*
53d04ccbb3Scarlsonj * dhcp_start(): starts DHCP on a state machine
547c478bd9Sstevel@tonic-gate *
557c478bd9Sstevel@tonic-gate * input: iu_tq_t *: unused
56d04ccbb3Scarlsonj * void *: the state machine on which to start DHCP
577c478bd9Sstevel@tonic-gate * output: void
587c478bd9Sstevel@tonic-gate */
597c478bd9Sstevel@tonic-gate
607c478bd9Sstevel@tonic-gate /* ARGSUSED */
61cfb9c9abScarlsonj static void
dhcp_start(iu_tq_t * tqp,void * arg)627c478bd9Sstevel@tonic-gate dhcp_start(iu_tq_t *tqp, void *arg)
637c478bd9Sstevel@tonic-gate {
64d04ccbb3Scarlsonj dhcp_smach_t *dsmp = arg;
657c478bd9Sstevel@tonic-gate
66cfb9c9abScarlsonj dsmp->dsm_start_timer = -1;
67cfb9c9abScarlsonj (void) set_smach_state(dsmp, INIT);
68cfb9c9abScarlsonj if (verify_smach(dsmp)) {
69cfb9c9abScarlsonj dhcpmsg(MSG_VERBOSE, "starting DHCP on %s", dsmp->dsm_name);
70cfb9c9abScarlsonj dhcp_selecting(dsmp);
71cfb9c9abScarlsonj }
72cfb9c9abScarlsonj }
73cfb9c9abScarlsonj
74cfb9c9abScarlsonj /*
75cfb9c9abScarlsonj * set_start_timer(): sets a random timer to start a DHCP state machine
76cfb9c9abScarlsonj *
77cfb9c9abScarlsonj * input: dhcp_smach_t *: the state machine on which to start DHCP
78cfb9c9abScarlsonj * output: boolean_t: B_TRUE if a timer is now running
79cfb9c9abScarlsonj */
80cfb9c9abScarlsonj
81cfb9c9abScarlsonj boolean_t
set_start_timer(dhcp_smach_t * dsmp)82cfb9c9abScarlsonj set_start_timer(dhcp_smach_t *dsmp)
83cfb9c9abScarlsonj {
84cfb9c9abScarlsonj if (dsmp->dsm_start_timer != -1)
85cfb9c9abScarlsonj return (B_TRUE);
86cfb9c9abScarlsonj
87cfb9c9abScarlsonj dsmp->dsm_start_timer = iu_schedule_timer_ms(tq,
88cfb9c9abScarlsonj lrand48() % DHCP_SELECT_WAIT, dhcp_start, dsmp);
89cfb9c9abScarlsonj if (dsmp->dsm_start_timer == -1)
90cfb9c9abScarlsonj return (B_FALSE);
917c478bd9Sstevel@tonic-gate
92cfb9c9abScarlsonj hold_smach(dsmp);
93cfb9c9abScarlsonj return (B_TRUE);
947c478bd9Sstevel@tonic-gate }
957c478bd9Sstevel@tonic-gate
967c478bd9Sstevel@tonic-gate /*
97d04ccbb3Scarlsonj * dhcp_selecting(): sends a DISCOVER and sets up reception of OFFERs for
98d04ccbb3Scarlsonj * IPv4, or sends a Solicit and sets up reception of
99d04ccbb3Scarlsonj * Advertisements for DHCPv6.
1007c478bd9Sstevel@tonic-gate *
101d04ccbb3Scarlsonj * input: dhcp_smach_t *: the state machine on which to send the DISCOVER
1027c478bd9Sstevel@tonic-gate * output: void
1037c478bd9Sstevel@tonic-gate */
1047c478bd9Sstevel@tonic-gate
1057c478bd9Sstevel@tonic-gate void
dhcp_selecting(dhcp_smach_t * dsmp)106d04ccbb3Scarlsonj dhcp_selecting(dhcp_smach_t *dsmp)
1077c478bd9Sstevel@tonic-gate {
1087c478bd9Sstevel@tonic-gate dhcp_pkt_t *dpkt;
1097c478bd9Sstevel@tonic-gate
1107c478bd9Sstevel@tonic-gate /*
111d04ccbb3Scarlsonj * We first set up to collect OFFER/Advertise packets as they arrive.
112d04ccbb3Scarlsonj * We then send out DISCOVER/Solicit probes. Then we wait a
113d04ccbb3Scarlsonj * user-tunable number of seconds before seeing if OFFERs/
114d04ccbb3Scarlsonj * Advertisements have come in response to our DISCOVER/Solicit. If
115d04ccbb3Scarlsonj * none have come in, we continue to wait, sending out our DISCOVER/
116d04ccbb3Scarlsonj * Solicit probes with exponential backoff. If no OFFER/Advertisement
117d04ccbb3Scarlsonj * is ever received, we will wait forever (note that since we're
118d04ccbb3Scarlsonj * event-driven though, we're still able to service other state
119d04ccbb3Scarlsonj * machines).
1207c478bd9Sstevel@tonic-gate *
121d04ccbb3Scarlsonj * Note that we do an reset_smach() here because we may be landing in
122d04ccbb3Scarlsonj * dhcp_selecting() as a result of restarting DHCP, so the state
123d04ccbb3Scarlsonj * machine may not be fresh.
1247c478bd9Sstevel@tonic-gate */
1257c478bd9Sstevel@tonic-gate
126d04ccbb3Scarlsonj reset_smach(dsmp);
127d04ccbb3Scarlsonj if (!set_smach_state(dsmp, SELECTING)) {
128d04ccbb3Scarlsonj dhcpmsg(MSG_ERROR,
129d04ccbb3Scarlsonj "dhcp_selecting: cannot switch to SELECTING state; "
130d04ccbb3Scarlsonj "reverting to INIT on %s", dsmp->dsm_name);
131d04ccbb3Scarlsonj goto failed;
1327c478bd9Sstevel@tonic-gate
133d04ccbb3Scarlsonj }
1347c478bd9Sstevel@tonic-gate
1350a3e1f6cSVasumathi Sundaram /* Remove the stale hostconf file, if there is any */
1360a3e1f6cSVasumathi Sundaram (void) remove_hostconf(dsmp->dsm_name, dsmp->dsm_isv6);
1370a3e1f6cSVasumathi Sundaram
138d04ccbb3Scarlsonj dsmp->dsm_offer_timer = iu_schedule_timer(tq,
139d04ccbb3Scarlsonj dsmp->dsm_offer_wait, dhcp_requesting, dsmp);
140d04ccbb3Scarlsonj if (dsmp->dsm_offer_timer == -1) {
1417c478bd9Sstevel@tonic-gate dhcpmsg(MSG_ERROR, "dhcp_selecting: cannot schedule to read "
142d04ccbb3Scarlsonj "%s packets", dsmp->dsm_isv6 ? "Advertise" : "OFFER");
143d04ccbb3Scarlsonj goto failed;
144d04ccbb3Scarlsonj }
1457c478bd9Sstevel@tonic-gate
146d04ccbb3Scarlsonj hold_smach(dsmp);
1477c478bd9Sstevel@tonic-gate
1487c478bd9Sstevel@tonic-gate /*
149d04ccbb3Scarlsonj * Assemble and send the DHCPDISCOVER or Solicit message.
150d04ccbb3Scarlsonj *
151d04ccbb3Scarlsonj * If this fails, we'll wait for the select timer to go off
152d04ccbb3Scarlsonj * before trying again.
1537c478bd9Sstevel@tonic-gate */
154d04ccbb3Scarlsonj if (dsmp->dsm_isv6) {
155d04ccbb3Scarlsonj dhcpv6_ia_na_t d6in;
1567c478bd9Sstevel@tonic-gate
157d04ccbb3Scarlsonj if ((dpkt = init_pkt(dsmp, DHCPV6_MSG_SOLICIT)) == NULL) {
158d04ccbb3Scarlsonj dhcpmsg(MSG_ERROR, "dhcp_selecting: unable to set up "
159d04ccbb3Scarlsonj "Solicit packet");
160d04ccbb3Scarlsonj return;
161d04ccbb3Scarlsonj }
1627c478bd9Sstevel@tonic-gate
163d04ccbb3Scarlsonj /* Add an IA_NA option for our controlling LIF */
164d04ccbb3Scarlsonj d6in.d6in_iaid = htonl(dsmp->dsm_lif->lif_iaid);
165d04ccbb3Scarlsonj d6in.d6in_t1 = htonl(0);
166d04ccbb3Scarlsonj d6in.d6in_t2 = htonl(0);
167d04ccbb3Scarlsonj (void) add_pkt_opt(dpkt, DHCPV6_OPT_IA_NA,
168d04ccbb3Scarlsonj (dhcpv6_option_t *)&d6in + 1,
169d04ccbb3Scarlsonj sizeof (d6in) - sizeof (dhcpv6_option_t));
170d04ccbb3Scarlsonj
171d04ccbb3Scarlsonj /* Option Request option for desired information */
172d04ccbb3Scarlsonj (void) add_pkt_prl(dpkt, dsmp);
173d04ccbb3Scarlsonj
174d04ccbb3Scarlsonj /* Enable Rapid-Commit */
175d04ccbb3Scarlsonj (void) add_pkt_opt(dpkt, DHCPV6_OPT_RAPID_COMMIT, NULL, 0);
176d04ccbb3Scarlsonj
177d04ccbb3Scarlsonj /* xxx add Reconfigure Accept */
178d04ccbb3Scarlsonj
179d04ccbb3Scarlsonj (void) send_pkt_v6(dsmp, dpkt, ipv6_all_dhcp_relay_and_servers,
180d04ccbb3Scarlsonj stop_selecting, DHCPV6_SOL_TIMEOUT, DHCPV6_SOL_MAX_RT);
181d04ccbb3Scarlsonj } else {
182d04ccbb3Scarlsonj if ((dpkt = init_pkt(dsmp, DISCOVER)) == NULL) {
183d04ccbb3Scarlsonj dhcpmsg(MSG_ERROR, "dhcp_selecting: unable to set up "
184d04ccbb3Scarlsonj "DISCOVER packet");
185d04ccbb3Scarlsonj return;
186d04ccbb3Scarlsonj }
1877c478bd9Sstevel@tonic-gate
188d04ccbb3Scarlsonj /*
189d04ccbb3Scarlsonj * The max DHCP message size option is set to the interface
190d04ccbb3Scarlsonj * MTU, minus the size of the UDP and IP headers.
191d04ccbb3Scarlsonj */
192d04ccbb3Scarlsonj (void) add_pkt_opt16(dpkt, CD_MAX_DHCP_SIZE,
193d04ccbb3Scarlsonj htons(dsmp->dsm_lif->lif_max - sizeof (struct udpiphdr)));
194d04ccbb3Scarlsonj (void) add_pkt_opt32(dpkt, CD_LEASE_TIME, htonl(DHCP_PERM));
195d04ccbb3Scarlsonj
196f4b3ec61Sdh if (class_id_len != 0) {
197f4b3ec61Sdh (void) add_pkt_opt(dpkt, CD_CLASS_ID, class_id,
198f4b3ec61Sdh class_id_len);
199f4b3ec61Sdh }
200d04ccbb3Scarlsonj (void) add_pkt_prl(dpkt, dsmp);
201d04ccbb3Scarlsonj
202*b31320a7SChris Fraire if (!dhcp_add_fqdn_opt(dpkt, dsmp))
203*b31320a7SChris Fraire (void) dhcp_add_hostname_opt(dpkt, dsmp);
204*b31320a7SChris Fraire
205d04ccbb3Scarlsonj (void) add_pkt_opt(dpkt, CD_END, NULL, 0);
206d04ccbb3Scarlsonj
207d04ccbb3Scarlsonj (void) send_pkt(dsmp, dpkt, htonl(INADDR_BROADCAST),
208d04ccbb3Scarlsonj stop_selecting);
2097c478bd9Sstevel@tonic-gate }
210d04ccbb3Scarlsonj return;
2117c478bd9Sstevel@tonic-gate
212d04ccbb3Scarlsonj failed:
213d04ccbb3Scarlsonj (void) set_smach_state(dsmp, INIT);
214d04ccbb3Scarlsonj dsmp->dsm_dflags |= DHCP_IF_FAILED;
215d04ccbb3Scarlsonj ipc_action_finish(dsmp, DHCP_IPC_E_MEMORY);
2167c478bd9Sstevel@tonic-gate }
2177c478bd9Sstevel@tonic-gate
2187c478bd9Sstevel@tonic-gate /*
219d04ccbb3Scarlsonj * stop_selecting(): decides when to stop retransmitting DISCOVERs -- only when
220d04ccbb3Scarlsonj * abandoning the state machine. For DHCPv6, this timer may
221d04ccbb3Scarlsonj * go off before the offer wait timer. If so, then this is a
222d04ccbb3Scarlsonj * good time to check for valid Advertisements, so cancel the
223d04ccbb3Scarlsonj * timer and go check.
2247c478bd9Sstevel@tonic-gate *
225d04ccbb3Scarlsonj * input: dhcp_smach_t *: the state machine DISCOVERs are being sent on
2267c478bd9Sstevel@tonic-gate * unsigned int: the number of DISCOVERs sent so far
2277c478bd9Sstevel@tonic-gate * output: boolean_t: B_TRUE if retransmissions should stop
2287c478bd9Sstevel@tonic-gate */
2297c478bd9Sstevel@tonic-gate
230d04ccbb3Scarlsonj /* ARGSUSED1 */
2317c478bd9Sstevel@tonic-gate static boolean_t
stop_selecting(dhcp_smach_t * dsmp,unsigned int n_discovers)232d04ccbb3Scarlsonj stop_selecting(dhcp_smach_t *dsmp, unsigned int n_discovers)
2337c478bd9Sstevel@tonic-gate {
234d04ccbb3Scarlsonj /*
235d04ccbb3Scarlsonj * If we're using v4 and the underlying LIF we're trying to configure
236d04ccbb3Scarlsonj * has been touched by the user, then bail out.
237d04ccbb3Scarlsonj */
238d04ccbb3Scarlsonj if (!dsmp->dsm_isv6 && !verify_lif(dsmp->dsm_lif)) {
239d04ccbb3Scarlsonj finished_smach(dsmp, DHCP_IPC_E_UNKIF);
240d04ccbb3Scarlsonj return (B_TRUE);
241d04ccbb3Scarlsonj }
242d04ccbb3Scarlsonj
243d04ccbb3Scarlsonj if (dsmp->dsm_recv_pkt_list != NULL) {
244d04ccbb3Scarlsonj dhcp_requesting(NULL, dsmp);
245d04ccbb3Scarlsonj if (dsmp->dsm_state != SELECTING)
246d04ccbb3Scarlsonj return (B_TRUE);
247d04ccbb3Scarlsonj }
2487c478bd9Sstevel@tonic-gate return (B_FALSE);
2497c478bd9Sstevel@tonic-gate }
250