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
5d04ccbb3Scarlsonj * Common Development and Distribution License (the "License").
6d04ccbb3Scarlsonj * 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 /*
22a1196271SJames Carlson * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
237c478bd9Sstevel@tonic-gate * Use is subject to license terms.
24*b31320a7SChris Fraire * Copyright (c) 2016-2017, Chris Fraire <cfraire@me.com>.
257c478bd9Sstevel@tonic-gate *
267c478bd9Sstevel@tonic-gate * INIT_REBOOT state of the DHCP client state machine.
277c478bd9Sstevel@tonic-gate */
287c478bd9Sstevel@tonic-gate
297c478bd9Sstevel@tonic-gate #include <sys/types.h>
307c478bd9Sstevel@tonic-gate #include <stdio.h>
317c478bd9Sstevel@tonic-gate #include <sys/socket.h>
327c478bd9Sstevel@tonic-gate #include <netinet/in.h>
337c478bd9Sstevel@tonic-gate #include <netinet/dhcp.h>
347c478bd9Sstevel@tonic-gate #include <netinet/udp.h>
357c478bd9Sstevel@tonic-gate #include <netinet/ip_var.h>
367c478bd9Sstevel@tonic-gate #include <netinet/udp_var.h>
377c478bd9Sstevel@tonic-gate #include <dhcpmsg.h>
387c478bd9Sstevel@tonic-gate #include <string.h>
397c478bd9Sstevel@tonic-gate
407c478bd9Sstevel@tonic-gate #include "agent.h"
417c478bd9Sstevel@tonic-gate #include "packet.h"
427c478bd9Sstevel@tonic-gate #include "states.h"
437c478bd9Sstevel@tonic-gate #include "util.h"
447c478bd9Sstevel@tonic-gate #include "interface.h"
457c478bd9Sstevel@tonic-gate #include "defaults.h"
467c478bd9Sstevel@tonic-gate
477c478bd9Sstevel@tonic-gate static stop_func_t stop_init_reboot;
487c478bd9Sstevel@tonic-gate
497c478bd9Sstevel@tonic-gate /*
50d04ccbb3Scarlsonj * dhcp_init_reboot_v4(): attempts to reuse a cached configuration for a state
51d04ccbb3Scarlsonj * machine.
527c478bd9Sstevel@tonic-gate *
53d04ccbb3Scarlsonj * input: dhcp_smach_t *: the state machine to examine for reuse
547c478bd9Sstevel@tonic-gate * output: void
557c478bd9Sstevel@tonic-gate */
567c478bd9Sstevel@tonic-gate
57d04ccbb3Scarlsonj static void
dhcp_init_reboot_v4(dhcp_smach_t * dsmp)58d04ccbb3Scarlsonj dhcp_init_reboot_v4(dhcp_smach_t *dsmp)
597c478bd9Sstevel@tonic-gate {
607c478bd9Sstevel@tonic-gate dhcp_pkt_t *dpkt;
617c478bd9Sstevel@tonic-gate
627c478bd9Sstevel@tonic-gate /*
637c478bd9Sstevel@tonic-gate * assemble DHCPREQUEST message. The max dhcp message size
647c478bd9Sstevel@tonic-gate * option is set to the interface max, minus the size of the udp and
657c478bd9Sstevel@tonic-gate * ip headers.
667c478bd9Sstevel@tonic-gate */
677c478bd9Sstevel@tonic-gate
68d04ccbb3Scarlsonj dpkt = init_pkt(dsmp, REQUEST);
69d04ccbb3Scarlsonj (void) add_pkt_opt32(dpkt, CD_REQUESTED_IP_ADDR,
70d04ccbb3Scarlsonj dsmp->dsm_ack->pkt->yiaddr.s_addr);
717c478bd9Sstevel@tonic-gate
72d04ccbb3Scarlsonj (void) add_pkt_opt32(dpkt, CD_LEASE_TIME, htonl(DHCP_PERM));
73d04ccbb3Scarlsonj (void) add_pkt_opt16(dpkt, CD_MAX_DHCP_SIZE,
74d04ccbb3Scarlsonj htons(dsmp->dsm_lif->lif_pif->pif_max - sizeof (struct udpiphdr)));
757c478bd9Sstevel@tonic-gate
76f4b3ec61Sdh if (class_id_len != 0)
77f4b3ec61Sdh (void) add_pkt_opt(dpkt, CD_CLASS_ID, class_id, class_id_len);
78d04ccbb3Scarlsonj (void) add_pkt_prl(dpkt, dsmp);
797c478bd9Sstevel@tonic-gate
80*b31320a7SChris Fraire if (!dhcp_add_fqdn_opt(dpkt, dsmp))
81*b31320a7SChris Fraire (void) dhcp_add_hostname_opt(dpkt, dsmp);
827c478bd9Sstevel@tonic-gate
83d04ccbb3Scarlsonj (void) add_pkt_opt(dpkt, CD_END, NULL, 0);
847c478bd9Sstevel@tonic-gate
85d04ccbb3Scarlsonj (void) send_pkt(dsmp, dpkt, htonl(INADDR_BROADCAST), stop_init_reboot);
86d04ccbb3Scarlsonj }
87d04ccbb3Scarlsonj
88d04ccbb3Scarlsonj
89d04ccbb3Scarlsonj /*
90d04ccbb3Scarlsonj * dhcp_init_reboot_v6(): attempts to reuse a cached configuration for a state
91d04ccbb3Scarlsonj * machine. Create a Confirm message and multicast it
92d04ccbb3Scarlsonj * out.
93d04ccbb3Scarlsonj *
94d04ccbb3Scarlsonj * input: dhcp_smach_t *: the state machine to examine for reuse
95d04ccbb3Scarlsonj * output: void
96d04ccbb3Scarlsonj */
97d04ccbb3Scarlsonj
98d04ccbb3Scarlsonj static void
dhcp_init_reboot_v6(dhcp_smach_t * dsmp)99d04ccbb3Scarlsonj dhcp_init_reboot_v6(dhcp_smach_t *dsmp)
100d04ccbb3Scarlsonj {
101d04ccbb3Scarlsonj dhcp_pkt_t *dpkt;
102d04ccbb3Scarlsonj dhcpv6_option_t *d6o, *d6so, *popt;
103d04ccbb3Scarlsonj uint_t olen, solen;
104d04ccbb3Scarlsonj dhcpv6_ia_na_t d6in;
105d04ccbb3Scarlsonj dhcpv6_iaaddr_t d6ia;
106d04ccbb3Scarlsonj char *obase;
107d04ccbb3Scarlsonj
108d04ccbb3Scarlsonj /*
109d04ccbb3Scarlsonj * Assemble a Confirm message based on the current ack.
110d04ccbb3Scarlsonj */
111d04ccbb3Scarlsonj
112d04ccbb3Scarlsonj dpkt = init_pkt(dsmp, DHCPV6_MSG_CONFIRM);
113d04ccbb3Scarlsonj
114d04ccbb3Scarlsonj /*
115d04ccbb3Scarlsonj * Loop over and copy IA_NAs and IAADDRs we have in our last ack. This
116d04ccbb3Scarlsonj * is what we'll be requesting.
117d04ccbb3Scarlsonj */
118d04ccbb3Scarlsonj d6o = NULL;
119d04ccbb3Scarlsonj while ((d6o = dhcpv6_pkt_option(dsmp->dsm_ack, d6o, DHCPV6_OPT_IA_NA,
120d04ccbb3Scarlsonj &olen)) != NULL) {
121d04ccbb3Scarlsonj
122d04ccbb3Scarlsonj /*
123d04ccbb3Scarlsonj * Copy in IA_NA option from the ack. Note that we use zero
124d04ccbb3Scarlsonj * for all timers in accordance with RFC 3315. (It would make
125d04ccbb3Scarlsonj * some sense to say what we think the current timers are as
126d04ccbb3Scarlsonj * a hint to the server, but the RFC doesn't agree.)
127d04ccbb3Scarlsonj */
128d04ccbb3Scarlsonj if (olen < sizeof (dhcpv6_ia_na_t))
129d04ccbb3Scarlsonj continue;
130d04ccbb3Scarlsonj (void) memcpy(&d6in, d6o, sizeof (d6in));
131d04ccbb3Scarlsonj d6in.d6in_t1 = 0;
132d04ccbb3Scarlsonj d6in.d6in_t2 = 0;
133d04ccbb3Scarlsonj popt = add_pkt_opt(dpkt, DHCPV6_OPT_IA_NA,
134d04ccbb3Scarlsonj (char *)&d6in + sizeof (*d6o),
135d04ccbb3Scarlsonj sizeof (d6in) - sizeof (*d6o));
136d04ccbb3Scarlsonj if (popt == NULL)
137d04ccbb3Scarlsonj goto failure;
138d04ccbb3Scarlsonj
139d04ccbb3Scarlsonj /*
140d04ccbb3Scarlsonj * Now loop over the IAADDR suboptions and add those.
141d04ccbb3Scarlsonj */
142d04ccbb3Scarlsonj obase = (char *)d6o + sizeof (dhcpv6_ia_na_t);
143d04ccbb3Scarlsonj olen -= sizeof (dhcpv6_ia_na_t);
144d04ccbb3Scarlsonj d6so = NULL;
145d04ccbb3Scarlsonj while ((d6so = dhcpv6_find_option(obase, olen, d6so,
146d04ccbb3Scarlsonj DHCPV6_OPT_IAADDR, &solen)) != NULL) {
147d04ccbb3Scarlsonj if (solen < sizeof (dhcpv6_iaaddr_t))
148d04ccbb3Scarlsonj continue;
149d04ccbb3Scarlsonj (void) memcpy(&d6ia, d6so, sizeof (d6ia));
150d04ccbb3Scarlsonj d6ia.d6ia_preflife = 0;
151d04ccbb3Scarlsonj d6ia.d6ia_vallife = 0;
152d04ccbb3Scarlsonj if (add_pkt_subopt(dpkt, popt, DHCPV6_OPT_IAADDR,
153d04ccbb3Scarlsonj (char *)&d6ia + sizeof (*d6so),
154d04ccbb3Scarlsonj sizeof (d6ia) - sizeof (*d6so)) == NULL)
155d04ccbb3Scarlsonj goto failure;
156d04ccbb3Scarlsonj }
157d04ccbb3Scarlsonj }
158d04ccbb3Scarlsonj
159d04ccbb3Scarlsonj /* Add required Option Request option */
160d04ccbb3Scarlsonj (void) add_pkt_prl(dpkt, dsmp);
161d04ccbb3Scarlsonj
162d04ccbb3Scarlsonj (void) send_pkt_v6(dsmp, dpkt, ipv6_all_dhcp_relay_and_servers,
163d04ccbb3Scarlsonj stop_init_reboot, DHCPV6_CNF_TIMEOUT, DHCPV6_CNF_MAX_RT);
164d04ccbb3Scarlsonj
165d04ccbb3Scarlsonj return;
166d04ccbb3Scarlsonj
167d04ccbb3Scarlsonj failure:
168cfb9c9abScarlsonj if (!set_start_timer(dsmp))
169d04ccbb3Scarlsonj dhcp_selecting(dsmp);
170d04ccbb3Scarlsonj }
171d04ccbb3Scarlsonj
172d04ccbb3Scarlsonj /*
173d04ccbb3Scarlsonj * dhcp_init_reboot(): attempts to reuse a cached configuration for a state
174d04ccbb3Scarlsonj * machine.
175d04ccbb3Scarlsonj *
176d04ccbb3Scarlsonj * input: dhcp_smach_t *: the state machine to examine for reuse
177d04ccbb3Scarlsonj * output: void
178d04ccbb3Scarlsonj */
179d04ccbb3Scarlsonj
180d04ccbb3Scarlsonj void
dhcp_init_reboot(dhcp_smach_t * dsmp)181d04ccbb3Scarlsonj dhcp_init_reboot(dhcp_smach_t *dsmp)
182d04ccbb3Scarlsonj {
183d04ccbb3Scarlsonj dhcpmsg(MSG_VERBOSE, "%s has cached configuration - entering "
184d04ccbb3Scarlsonj "INIT_REBOOT", dsmp->dsm_name);
185d04ccbb3Scarlsonj
186d04ccbb3Scarlsonj if (!set_smach_state(dsmp, INIT_REBOOT)) {
187d04ccbb3Scarlsonj dhcpmsg(MSG_ERROR, "dhcp_init_reboot: cannot register to "
188d04ccbb3Scarlsonj "collect ACK/NAK packets, reverting to INIT on %s",
189d04ccbb3Scarlsonj dsmp->dsm_name);
190d04ccbb3Scarlsonj
191d04ccbb3Scarlsonj dsmp->dsm_dflags |= DHCP_IF_FAILED;
192d04ccbb3Scarlsonj (void) set_smach_state(dsmp, INIT);
193d04ccbb3Scarlsonj ipc_action_finish(dsmp, DHCP_IPC_E_MEMORY);
194d04ccbb3Scarlsonj return;
195d04ccbb3Scarlsonj }
196d04ccbb3Scarlsonj
197d04ccbb3Scarlsonj if (dsmp->dsm_isv6)
198d04ccbb3Scarlsonj dhcp_init_reboot_v6(dsmp);
199d04ccbb3Scarlsonj else
200d04ccbb3Scarlsonj dhcp_init_reboot_v4(dsmp);
2017c478bd9Sstevel@tonic-gate }
2027c478bd9Sstevel@tonic-gate
2037c478bd9Sstevel@tonic-gate /*
2047c478bd9Sstevel@tonic-gate * stop_init_reboot(): decides when to stop retransmitting REQUESTs
2057c478bd9Sstevel@tonic-gate *
206d04ccbb3Scarlsonj * input: dhcp_smach_t *: the state machine sending the REQUESTs
2077c478bd9Sstevel@tonic-gate * unsigned int: the number of REQUESTs sent so far
2087c478bd9Sstevel@tonic-gate * output: boolean_t: B_TRUE if retransmissions should stop
2097c478bd9Sstevel@tonic-gate */
2107c478bd9Sstevel@tonic-gate
2117c478bd9Sstevel@tonic-gate static boolean_t
stop_init_reboot(dhcp_smach_t * dsmp,unsigned int n_requests)212d04ccbb3Scarlsonj stop_init_reboot(dhcp_smach_t *dsmp, unsigned int n_requests)
2137c478bd9Sstevel@tonic-gate {
214d04ccbb3Scarlsonj if (dsmp->dsm_isv6) {
215d04ccbb3Scarlsonj uint_t nowabs, maxabs;
2167c478bd9Sstevel@tonic-gate
21719449258SJosef 'Jeff' Sipek nowabs = NSEC2MSEC(gethrtime());
21819449258SJosef 'Jeff' Sipek maxabs = NSEC2MSEC(dsmp->dsm_neg_hrtime) + DHCPV6_CNF_MAX_RD;
219d04ccbb3Scarlsonj if (nowabs < maxabs) {
220d04ccbb3Scarlsonj /* Cap the timer based on the maximum */
221d04ccbb3Scarlsonj if (nowabs + dsmp->dsm_send_timeout > maxabs)
222d04ccbb3Scarlsonj dsmp->dsm_send_timeout = maxabs - nowabs;
223d04ccbb3Scarlsonj return (B_FALSE);
224d04ccbb3Scarlsonj }
225d04ccbb3Scarlsonj } else {
226d04ccbb3Scarlsonj if (n_requests < DHCP_MAX_REQUESTS)
227d04ccbb3Scarlsonj return (B_FALSE);
228a1196271SJames Carlson }
229a1196271SJames Carlson
230a1196271SJames Carlson if (df_get_bool(dsmp->dsm_name, dsmp->dsm_isv6,
231a1196271SJames Carlson DF_VERIFIED_LEASE_ONLY)) {
232a1196271SJames Carlson dhcpmsg(MSG_INFO,
233a1196271SJames Carlson "unable to verify existing lease on %s; restarting",
234a1196271SJames Carlson dsmp->dsm_name);
235a1196271SJames Carlson dhcp_selecting(dsmp);
236a1196271SJames Carlson return (B_TRUE);
237a1196271SJames Carlson }
238a1196271SJames Carlson
239a1196271SJames Carlson if (dsmp->dsm_isv6) {
240a1196271SJames Carlson dhcpmsg(MSG_INFO, "no Reply to Confirm, using remainder of "
241a1196271SJames Carlson "existing lease on %s", dsmp->dsm_name);
242a1196271SJames Carlson } else {
2437c478bd9Sstevel@tonic-gate dhcpmsg(MSG_INFO, "no ACK/NAK to INIT_REBOOT REQUEST, "
244d04ccbb3Scarlsonj "using remainder of existing lease on %s", dsmp->dsm_name);
245d04ccbb3Scarlsonj }
2467c478bd9Sstevel@tonic-gate
247d04ccbb3Scarlsonj /*
248d04ccbb3Scarlsonj * We already stuck our old ack in dsmp->dsm_ack and relativized the
249d04ccbb3Scarlsonj * packet times, so we can just pretend that the server sent it to us
250d04ccbb3Scarlsonj * and move to bound. If that fails, fall back to selecting.
251d04ccbb3Scarlsonj */
2527c478bd9Sstevel@tonic-gate
253d04ccbb3Scarlsonj if (dhcp_bound(dsmp, NULL)) {
254d04ccbb3Scarlsonj if (dsmp->dsm_isv6) {
255d04ccbb3Scarlsonj if (!save_server_id(dsmp, dsmp->dsm_ack))
256d04ccbb3Scarlsonj goto failure;
257d04ccbb3Scarlsonj server_unicast_option(dsmp, dsmp->dsm_ack);
258d04ccbb3Scarlsonj }
259d04ccbb3Scarlsonj } else {
260d04ccbb3Scarlsonj failure:
261d04ccbb3Scarlsonj dhcpmsg(MSG_INFO, "unable to use saved lease on %s; restarting",
262d04ccbb3Scarlsonj dsmp->dsm_name);
263d04ccbb3Scarlsonj dhcp_selecting(dsmp);
2647c478bd9Sstevel@tonic-gate }
2657c478bd9Sstevel@tonic-gate
266d04ccbb3Scarlsonj return (B_TRUE);
2677c478bd9Sstevel@tonic-gate }
268