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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.
*
* DECLINE/RELEASE configuration functionality for the DHCP client.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <netinet/in.h>
#include <net/if.h>
#include <netinet/dhcp.h>
#include <netinet/dhcp6.h>
#include <dhcpmsg.h>
#include <dhcp_hostconf.h>
#include <dhcpagent_util.h>
#include "agent.h"
#include "packet.h"
#include "interface.h"
#include "states.h"
static boolean_t stop_release_decline(dhcp_smach_t *, unsigned int);
/*
* send_declines(): sends a DECLINE message (broadcasted for IPv4) to the
* server to indicate a problem with the offered addresses.
* The failing addresses are removed from the leases.
*
* input: dhcp_smach_t *: the state machine sending DECLINE
* output: void
*/
void
send_declines(dhcp_smach_t *dsmp)
{
dhcp_pkt_t *dpkt;
dhcp_lease_t *dlp, *dlpn;
uint_t nlifs;
dhcp_lif_t *lif, *lifn;
boolean_t got_one;
/*
* Create an empty DECLINE message. We'll stuff the information into
* this message as we find it.
*/
if (dsmp->dsm_isv6) {
if ((dpkt = init_pkt(dsmp, DHCPV6_MSG_DECLINE)) == NULL)
return;
(void) add_pkt_opt(dpkt, DHCPV6_OPT_SERVERID,
dsmp->dsm_serverid, dsmp->dsm_serveridlen);
} else {
ipaddr_t serverip;
/*
* If this ack is from BOOTP, then there's no way to send a
* decline. Note that since we haven't bound yet, we can't
* just check the BOOTP flag.
*/
if (dsmp->dsm_ack->opts[CD_DHCP_TYPE] == NULL)
return;
if ((dpkt = init_pkt(dsmp, DECLINE)) == NULL)
return;
IN6_V4MAPPED_TO_IPADDR(&dsmp->dsm_server, serverip);
(void) add_pkt_opt32(dpkt, CD_SERVER_ID, serverip);
}
/*
* Loop over the leases, looking for ones with now-broken LIFs. Add
* each one found to the DECLINE message, and remove it from the list.
* Also remove any completely declined leases.
*/
got_one = B_FALSE;
for (dlp = dsmp->dsm_leases; dlp != NULL; dlp = dlpn) {
dlpn = dlp->dl_next;
lif = dlp->dl_lifs;
for (nlifs = dlp->dl_nlifs; nlifs > 0; nlifs--, lif = lifn) {
lifn = lif->lif_next;
if (lif->lif_declined != NULL) {
(void) add_pkt_lif(dpkt, lif,
DHCPV6_STAT_UNSPECFAIL, lif->lif_declined);
unplumb_lif(lif);
got_one = B_TRUE;
}
}
if (dlp->dl_nlifs == 0)
remove_lease(dlp);
}
if (!got_one)
return;
(void) set_smach_state(dsmp, DECLINING);
if (dsmp->dsm_isv6) {
(void) send_pkt_v6(dsmp, dpkt, dsmp->dsm_server,
stop_release_decline, DHCPV6_DEC_TIMEOUT, 0);
} else {
(void) add_pkt_opt(dpkt, CD_END, NULL, 0);
(void) send_pkt(dsmp, dpkt, htonl(INADDR_BROADCAST), NULL);
}
}
/*
* dhcp_release(): sends a RELEASE message to a DHCP server and removes
* the all interfaces for the given state machine from DHCP
* control. Called back by script handler.
*
* input: dhcp_smach_t *: the state machine to send the RELEASE on and remove
* void *: an optional text explanation to send with the message
* output: int: 1 on success, 0 on failure
*/
int
dhcp_release(dhcp_smach_t *dsmp, void *arg)
{
const char *msg = arg;
dhcp_pkt_t *dpkt;
dhcp_lease_t *dlp;
dhcp_lif_t *lif;
ipaddr_t serverip;
uint_t nlifs;
if ((dsmp->dsm_dflags & DHCP_IF_BOOTP) ||
!check_cmd_allowed(dsmp->dsm_state, DHCP_RELEASE)) {
ipc_action_finish(dsmp, DHCP_IPC_E_INT);
return (0);
}
dhcpmsg(MSG_INFO, "releasing leases for state machine %s",
dsmp->dsm_name);
(void) set_smach_state(dsmp, RELEASING);
if (dsmp->dsm_isv6) {
dpkt = init_pkt(dsmp, DHCPV6_MSG_RELEASE);
(void) add_pkt_opt(dpkt, DHCPV6_OPT_SERVERID,
dsmp->dsm_serverid, dsmp->dsm_serveridlen);
for (dlp = dsmp->dsm_leases; dlp != NULL; dlp = dlp->dl_next) {
lif = dlp->dl_lifs;
for (nlifs = dlp->dl_nlifs; nlifs > 0;
nlifs--, lif = lif->lif_next) {
(void) add_pkt_lif(dpkt, lif,
DHCPV6_STAT_SUCCESS, NULL);
}
}
/*
* Must kill off the leases before attempting to tell the
* server.
*/
deprecate_leases(dsmp);
/*
* For DHCPv6, this is a transaction, rather than just a
* one-shot message. When this transaction is done, we'll
* finish the invoking async operation.
*/
(void) send_pkt_v6(dsmp, dpkt, dsmp->dsm_server,
stop_release_decline, DHCPV6_REL_TIMEOUT, 0);
} else {
if ((dlp = dsmp->dsm_leases) != NULL && dlp->dl_nlifs > 0) {
dpkt = init_pkt(dsmp, RELEASE);
if (msg != NULL) {
(void) add_pkt_opt(dpkt, CD_MESSAGE, msg,
strlen(msg) + 1);
}
lif = dlp->dl_lifs;
(void) add_pkt_lif(dpkt, dlp->dl_lifs, 0, NULL);
IN6_V4MAPPED_TO_IPADDR(&dsmp->dsm_server, serverip);
(void) add_pkt_opt32(dpkt, CD_SERVER_ID, serverip);
(void) add_pkt_opt(dpkt, CD_END, NULL, 0);
(void) send_pkt(dsmp, dpkt, serverip, NULL);
}
/*
* XXX this totally sucks, but since udp is best-effort,
* without this delay, there's a good chance that the packet
* that we just enqueued for sending will get pitched
* when we canonize the interface through remove_smach.
*/
(void) usleep(500);
deprecate_leases(dsmp);
finished_smach(dsmp, DHCP_IPC_SUCCESS);
}
return (1);
}
/*
* dhcp_drop(): drops the interface from DHCP control; callback from script
* handler
*
* input: dhcp_smach_t *: the state machine dropping leases
* void *: unused
* output: int: always 1
*/
/* ARGSUSED1 */
int
dhcp_drop(dhcp_smach_t *dsmp, void *arg)
{
dhcpmsg(MSG_INFO, "dropping leases for state machine %s",
dsmp->dsm_name);
if (dsmp->dsm_state == PRE_BOUND || dsmp->dsm_state == BOUND ||
dsmp->dsm_state == RENEWING || dsmp->dsm_state == REBINDING) {
if (dsmp->dsm_dflags & DHCP_IF_BOOTP) {
dhcpmsg(MSG_INFO,
"used bootp; not writing lease file for %s",
dsmp->dsm_name);
} else {
PKT_LIST *plp[2];
const char *hcfile;
hcfile = ifname_to_hostconf(dsmp->dsm_name,
dsmp->dsm_isv6);
plp[0] = dsmp->dsm_ack;
plp[1] = dsmp->dsm_orig_ack;
if (write_hostconf(dsmp->dsm_name, plp, 2,
monosec_to_time(dsmp->dsm_curstart_monosec),
dsmp->dsm_isv6) != -1) {
dhcpmsg(MSG_DEBUG, "wrote lease to %s", hcfile);
} else if (errno == EROFS) {
dhcpmsg(MSG_DEBUG, "%s is on a read-only file "
"system; not saving lease", hcfile);
} else {
dhcpmsg(MSG_ERR, "cannot write %s (reboot will "
"not use cached configuration)", hcfile);
}
}
} else {
dhcpmsg(MSG_DEBUG, "%s in state %s; not saving lease",
dsmp->dsm_name, dhcp_state_to_string(dsmp->dsm_state));
}
deprecate_leases(dsmp);
finished_smach(dsmp, DHCP_IPC_SUCCESS);
return (1);
}
/*
* stop_release_decline(): decides when to stop retransmitting RELEASE/DECLINE
* messages for DHCPv6. When we stop, if there are no
* more leases left, then restart the state machine.
*
* input: dhcp_smach_t *: the state machine messages are being sent from
* unsigned int: the number of messages sent so far
* output: boolean_t: B_TRUE if retransmissions should stop
*/
static boolean_t
stop_release_decline(dhcp_smach_t *dsmp, unsigned int n_requests)
{
if (dsmp->dsm_state == RELEASING) {
if (n_requests >= DHCPV6_REL_MAX_RC) {
dhcpmsg(MSG_INFO, "no Reply to Release, finishing "
"transaction on %s", dsmp->dsm_name);
finished_smach(dsmp, DHCP_IPC_SUCCESS);
return (B_TRUE);
} else {
return (B_FALSE);
}
} else {
if (n_requests >= DHCPV6_DEC_MAX_RC) {
dhcpmsg(MSG_INFO, "no Reply to Decline on %s",
dsmp->dsm_name);
if (dsmp->dsm_leases == NULL) {
dhcpmsg(MSG_VERBOSE, "stop_release_decline: "
"%s has no leases left; restarting",
dsmp->dsm_name);
dhcp_restart(dsmp);
}
return (B_TRUE);
} else {
return (B_FALSE);
}
}
}
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