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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* INIT_REBOOT state of the DHCP client state machine.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <stdio.h>
#include <limits.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/dhcp.h>
#include <netinet/udp.h>
#include <netinet/ip_var.h>
#include <netinet/udp_var.h>
#include <dhcpmsg.h>
#include <string.h>
#include "agent.h"
#include "packet.h"
#include "states.h"
#include "util.h"
#include "interface.h"
#include "defaults.h"
static stop_func_t stop_init_reboot;
/*
* dhcp_init_reboot_v4(): attempts to reuse a cached configuration for a state
* machine.
*
* input: dhcp_smach_t *: the state machine to examine for reuse
* output: void
*/
static void
dhcp_init_reboot_v4(dhcp_smach_t *dsmp)
{
dhcp_pkt_t *dpkt;
const char *reqhost;
char hostfile[PATH_MAX + 1];
/*
* assemble DHCPREQUEST message. The max dhcp message size
* option is set to the interface max, minus the size of the udp and
* ip headers.
*/
dpkt = init_pkt(dsmp, REQUEST);
(void) add_pkt_opt32(dpkt, CD_REQUESTED_IP_ADDR,
dsmp->dsm_ack->pkt->yiaddr.s_addr);
(void) add_pkt_opt32(dpkt, CD_LEASE_TIME, htonl(DHCP_PERM));
(void) add_pkt_opt16(dpkt, CD_MAX_DHCP_SIZE,
htons(dsmp->dsm_lif->lif_pif->pif_max - sizeof (struct udpiphdr)));
if (class_id_len != 0)
(void) add_pkt_opt(dpkt, CD_CLASS_ID, class_id, class_id_len);
(void) add_pkt_prl(dpkt, dsmp);
/*
* Set CD_HOSTNAME option if REQUEST_HOSTNAME is set and a hostname
* is found in /etc/hostname.<ifname>
*/
if (df_get_bool(dsmp->dsm_name, dsmp->dsm_isv6, DF_REQUEST_HOSTNAME)) {
(void) snprintf(hostfile, sizeof (hostfile), "/etc/hostname.%s",
dsmp->dsm_name);
if ((reqhost = iffile_to_hostname(hostfile)) != NULL) {
dhcpmsg(MSG_DEBUG, "dhcp_selecting: host %s", reqhost);
if ((dsmp->dsm_reqhost = strdup(reqhost)) != NULL)
(void) add_pkt_opt(dpkt, CD_HOSTNAME,
dsmp->dsm_reqhost,
strlen(dsmp->dsm_reqhost));
else
dhcpmsg(MSG_WARNING, "dhcp_selecting: cannot"
" allocate memory for host name option");
} else {
dhcpmsg(MSG_DEBUG,
"dhcp_selecting: no hostname for %s",
dsmp->dsm_name);
}
}
(void) add_pkt_opt(dpkt, CD_END, NULL, 0);
(void) send_pkt(dsmp, dpkt, htonl(INADDR_BROADCAST), stop_init_reboot);
}
/*
* dhcp_init_reboot_v6(): attempts to reuse a cached configuration for a state
* machine. Create a Confirm message and multicast it
* out.
*
* input: dhcp_smach_t *: the state machine to examine for reuse
* output: void
*/
static void
dhcp_init_reboot_v6(dhcp_smach_t *dsmp)
{
dhcp_pkt_t *dpkt;
dhcpv6_option_t *d6o, *d6so, *popt;
uint_t olen, solen;
dhcpv6_ia_na_t d6in;
dhcpv6_iaaddr_t d6ia;
char *obase;
/*
* Assemble a Confirm message based on the current ack.
*/
dpkt = init_pkt(dsmp, DHCPV6_MSG_CONFIRM);
/*
* Loop over and copy IA_NAs and IAADDRs we have in our last ack. This
* is what we'll be requesting.
*/
d6o = NULL;
while ((d6o = dhcpv6_pkt_option(dsmp->dsm_ack, d6o, DHCPV6_OPT_IA_NA,
&olen)) != NULL) {
/*
* Copy in IA_NA option from the ack. Note that we use zero
* for all timers in accordance with RFC 3315. (It would make
* some sense to say what we think the current timers are as
* a hint to the server, but the RFC doesn't agree.)
*/
if (olen < sizeof (dhcpv6_ia_na_t))
continue;
(void) memcpy(&d6in, d6o, sizeof (d6in));
d6in.d6in_t1 = 0;
d6in.d6in_t2 = 0;
popt = add_pkt_opt(dpkt, DHCPV6_OPT_IA_NA,
(char *)&d6in + sizeof (*d6o),
sizeof (d6in) - sizeof (*d6o));
if (popt == NULL)
goto failure;
/*
* Now loop over the IAADDR suboptions and add those.
*/
obase = (char *)d6o + sizeof (dhcpv6_ia_na_t);
olen -= sizeof (dhcpv6_ia_na_t);
d6so = NULL;
while ((d6so = dhcpv6_find_option(obase, olen, d6so,
DHCPV6_OPT_IAADDR, &solen)) != NULL) {
if (solen < sizeof (dhcpv6_iaaddr_t))
continue;
(void) memcpy(&d6ia, d6so, sizeof (d6ia));
d6ia.d6ia_preflife = 0;
d6ia.d6ia_vallife = 0;
if (add_pkt_subopt(dpkt, popt, DHCPV6_OPT_IAADDR,
(char *)&d6ia + sizeof (*d6so),
sizeof (d6ia) - sizeof (*d6so)) == NULL)
goto failure;
}
}
/* Add required Option Request option */
(void) add_pkt_prl(dpkt, dsmp);
(void) send_pkt_v6(dsmp, dpkt, ipv6_all_dhcp_relay_and_servers,
stop_init_reboot, DHCPV6_CNF_TIMEOUT, DHCPV6_CNF_MAX_RT);
return;
failure:
if (!set_start_timer(dsmp))
dhcp_selecting(dsmp);
}
/*
* dhcp_init_reboot(): attempts to reuse a cached configuration for a state
* machine.
*
* input: dhcp_smach_t *: the state machine to examine for reuse
* output: void
*/
void
dhcp_init_reboot(dhcp_smach_t *dsmp)
{
dhcpmsg(MSG_VERBOSE, "%s has cached configuration - entering "
"INIT_REBOOT", dsmp->dsm_name);
if (!set_smach_state(dsmp, INIT_REBOOT)) {
dhcpmsg(MSG_ERROR, "dhcp_init_reboot: cannot register to "
"collect ACK/NAK packets, reverting to INIT on %s",
dsmp->dsm_name);
dsmp->dsm_dflags |= DHCP_IF_FAILED;
(void) set_smach_state(dsmp, INIT);
ipc_action_finish(dsmp, DHCP_IPC_E_MEMORY);
return;
}
if (dsmp->dsm_isv6)
dhcp_init_reboot_v6(dsmp);
else
dhcp_init_reboot_v4(dsmp);
}
/*
* stop_init_reboot(): decides when to stop retransmitting REQUESTs
*
* input: dhcp_smach_t *: the state machine sending the REQUESTs
* unsigned int: the number of REQUESTs sent so far
* output: boolean_t: B_TRUE if retransmissions should stop
*/
static boolean_t
stop_init_reboot(dhcp_smach_t *dsmp, unsigned int n_requests)
{
if (dsmp->dsm_isv6) {
uint_t nowabs, maxabs;
nowabs = gethrtime() / (NANOSEC / MILLISEC);
maxabs = dsmp->dsm_neg_hrtime / (NANOSEC / MILLISEC) +
DHCPV6_CNF_MAX_RD;
if (nowabs < maxabs) {
/* Cap the timer based on the maximum */
if (nowabs + dsmp->dsm_send_timeout > maxabs)
dsmp->dsm_send_timeout = maxabs - nowabs;
return (B_FALSE);
}
dhcpmsg(MSG_INFO, "no Reply to Confirm, using remainder of "
"existing lease on %s", dsmp->dsm_name);
} else {
if (n_requests < DHCP_MAX_REQUESTS)
return (B_FALSE);
dhcpmsg(MSG_INFO, "no ACK/NAK to INIT_REBOOT REQUEST, "
"using remainder of existing lease on %s", dsmp->dsm_name);
}
/*
* We already stuck our old ack in dsmp->dsm_ack and relativized the
* packet times, so we can just pretend that the server sent it to us
* and move to bound. If that fails, fall back to selecting.
*/
if (dhcp_bound(dsmp, NULL)) {
if (dsmp->dsm_isv6) {
if (!save_server_id(dsmp, dsmp->dsm_ack))
goto failure;
server_unicast_option(dsmp, dsmp->dsm_ack);
}
} else {
failure:
dhcpmsg(MSG_INFO, "unable to use saved lease on %s; restarting",
dsmp->dsm_name);
dhcp_selecting(dsmp);
}
return (B_TRUE);
}
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