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);
}
} else {
if (n_requests < DHCP_MAX_REQUESTS)
return (B_FALSE);
}
if (df_get_bool(dsmp->dsm_name, dsmp->dsm_isv6,
DF_VERIFIED_LEASE_ONLY)) {
dhcpmsg(MSG_INFO,
"unable to verify existing lease on %s; restarting",
dsmp->dsm_name);
dhcp_selecting(dsmp);
return (B_TRUE);
}
if (dsmp->dsm_isv6) {
dhcpmsg(MSG_INFO, "no Reply to Confirm, using remainder of "
"existing lease on %s", dsmp->dsm_name);
} else {
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);
}
/* ARGSUSED */
static void
dhcp_start(iu_tq_t *tqp, void *arg)
{
dhcp_smach_t *dsmp = arg;
dsmp->dsm_start_timer = -1;
(void) set_smach_state(dsmp, INIT);
if (verify_smach(dsmp)) {
dhcpmsg(MSG_VERBOSE, "starting DHCP on %s", dsmp->dsm_name);
dhcp_selecting(dsmp);
}
}
static void
request_failed(dhcp_smach_t *dsmp)
{
PKT_LIST *offer;
dsmp->dsm_server = ipv6_all_dhcp_relay_and_servers;
if ((offer = select_best(dsmp)) != NULL) {
insque(offer, &dsmp->dsm_recv_pkt_list);
dhcp_requesting(NULL, dsmp);
} else {
dhcpmsg(MSG_INFO, "no offers left on %s; restarting",
dsmp->dsm_name);
dhcp_selecting(dsmp);
}
}
static int
dhcp_finish_expire(dhcp_smach_t *dsmp, void *arg)
{
dhcp_lif_t *lif = arg;
dhcp_lease_t *dlp;
dhcpmsg(MSG_DEBUG, "lease expired on %s; removing", lif->lif_name);
dlp = lif->lif_lease;
unplumb_lif(lif);
if (dlp->dl_nlifs == 0)
remove_lease(dlp);
release_lif(lif);
/* If some valid leases remain, then drive on */
if (dsmp->dsm_leases != NULL) {
dhcpmsg(MSG_DEBUG,
"dhcp_finish_expire: some leases remain on %s",
dsmp->dsm_name);
return (1);
}
(void) remove_hostconf(dsmp->dsm_name, dsmp->dsm_isv6);
dhcpmsg(MSG_INFO, "last lease expired on %s -- restarting DHCP",
dsmp->dsm_name);
/*
* in the case where the lease is less than DHCP_REBIND_MIN
* seconds, we will never enter dhcp_renew() and thus the packet
* counters will not be reset. in that case, reset them here.
*/
if (dsmp->dsm_state == BOUND) {
dsmp->dsm_bad_offers = 0;
dsmp->dsm_sent = 0;
dsmp->dsm_received = 0;
}
deprecate_leases(dsmp);
/* reset_smach() in dhcp_selecting() will clean up any leftover state */
dhcp_selecting(dsmp);
return (1);
}
/* ARGSUSED */
static int
dhcp_restart_lease(struct ifslist *ifsp, const char *msg)
{
dhcpmsg(MSG_INFO, "lease expired on %s -- restarting DHCP",
ifsp->if_name);
/*
* in the case where the lease is less than DHCP_REBIND_MIN
* seconds, we will never enter dhcp_renew() and thus the packet
* counters will not be reset. in that case, reset them here.
*/
if (ifsp->if_state == BOUND) {
ifsp->if_bad_offers = 0;
ifsp->if_sent = 0;
ifsp->if_received = 0;
}
(void) canonize_ifs(ifsp);
/* reset_ifs() in dhcp_selecting() will clean up any leftover state */
dhcp_selecting(ifsp);
return (1);
}
/* ARGSUSED */
static void
ipc_event(iu_eh_t *ehp, int fd, short events, iu_event_id_t id, void *arg)
{
dhcp_ipc_request_t *request;
struct ifslist *ifsp, *primary_ifsp;
int error, is_priv = (int)arg;
PKT_LIST *plp[2];
dhcp_ipc_type_t cmd;
(void) iu_unregister_event(eh, id, NULL);
if (dhcp_ipc_recv_request(fd, &request, DHCP_IPC_REQUEST_WAIT) != 0) {
dhcpmsg(MSG_ERROR, "ipc_event: dhcp_ipc_recv_request failed");
(void) dhcp_ipc_close(fd);
return;
}
cmd = DHCP_IPC_CMD(request->message_type);
if (cmd >= DHCP_NIPC) {
send_error_reply(request, DHCP_IPC_E_CMD_UNKNOWN, &fd);
return;
}
/* return EPERM for any of the privileged actions */
if (!is_priv) {
switch (cmd) {
case DHCP_STATUS:
case DHCP_PING:
case DHCP_GET_TAG:
break;
default:
dhcpmsg(MSG_WARNING, "ipc_event: privileged ipc "
"command (%i) attempted on %s", cmd,
request->ifname);
send_error_reply(request, DHCP_IPC_E_PERM, &fd);
return;
}
}
/*
* try to locate the ifs associated with this command. if the
* command is DHCP_START or DHCP_INFORM, then if there isn't
* an ifs already, make one (there may already be one from a
* previous failed attempt to START or INFORM). otherwise,
* verify the interface is still valid.
*/
ifsp = lookup_ifs(request->ifname);
switch (cmd) {
case DHCP_START: /* FALLTHRU */
case DHCP_INFORM:
/*
* it's possible that the interface already exists, but
* has been abandoned. usually in those cases we should
* return DHCP_IPC_E_UNKIF, but that makes little sense
* in the case of "start" or "inform", so just ignore
* the abandoned interface and start over anew.
*/
if (ifsp != NULL && verify_ifs(ifsp) == 0)
ifsp = NULL;
/*
* as part of initializing the ifs, insert_ifs()
* creates a DLPI stream at ifsp->if_dlpi_fd.
*/
if (ifsp == NULL) {
ifsp = insert_ifs(request->ifname, B_FALSE, &error);
if (ifsp == NULL) {
send_error_reply(request, error, &fd);
return;
}
}
break;
default:
if (ifsp == NULL) {
if (request->ifname[0] == '\0')
error = DHCP_IPC_E_NOPRIMARY;
else
error = DHCP_IPC_E_UNKIF;
send_error_reply(request, error, &fd);
return;
}
break;
}
if (verify_ifs(ifsp) == 0) {
send_error_reply(request, DHCP_IPC_E_UNKIF, &fd);
return;
}
if (ifsp->if_dflags & DHCP_IF_BOOTP) {
switch (cmd) {
case DHCP_EXTEND:
case DHCP_RELEASE:
case DHCP_INFORM:
send_error_reply(request, DHCP_IPC_E_BOOTP, &fd);
return;
default:
break;
}
}
/*
* verify that the interface is in a state which will allow the
* command. we do this up front so that we can return an error
* *before* needlessly cancelling an in-progress transaction.
*/
if (!ipc_cmd_allowed[ifsp->if_state][cmd]) {
send_error_reply(request, DHCP_IPC_E_OUTSTATE, &fd);
return;
}
if ((request->message_type & DHCP_PRIMARY) && is_priv) {
if ((primary_ifsp = lookup_ifs("")) != NULL)
primary_ifsp->if_dflags &= ~DHCP_IF_PRIMARY;
ifsp->if_dflags |= DHCP_IF_PRIMARY;
}
/*
* current design dictates that there can be only one
* outstanding transaction per interface -- this simplifies
* the code considerably and also fits well with RFC2131.
* it is worth classifying the different DHCP commands into
* synchronous (those which we will handle now and be done
* with) and asynchronous (those which require transactions
* and will be completed at an indeterminate time in the
* future):
*
* DROP: removes the agent's management of an interface.
* asynchronous as the script program may be invoked.
*
* PING: checks to see if the agent controls an interface.
* synchronous, since no packets need to be sent
* to the DHCP server.
*
* STATUS: returns information about the an interface.
* synchronous, since no packets need to be sent
* to the DHCP server.
*
* RELEASE: releases the agent's management of an interface
* and brings the interface down. asynchronous as
* the script program may be invoked.
*
* EXTEND: renews a lease. asynchronous, since the agent
* needs to wait for an ACK, etc.
*
* START: starts DHCP on an interface. asynchronous since
* the agent needs to wait for OFFERs, ACKs, etc.
*
* INFORM: obtains configuration parameters for an externally
* configured interface. asynchronous, since the
* agent needs to wait for an ACK.
*
* notice that EXTEND, INFORM, START, DROP and RELEASE are
* asynchronous. notice also that asynchronous commands may
* occur from within the agent -- for instance, the agent
* will need to do implicit EXTENDs to extend the lease. in
* order to make the code simpler, the following rules apply
* for asynchronous commands:
*
* there can only be one asynchronous command at a time per
* interface. the current asynchronous command is managed by
* the async_* api: async_start(), async_finish(),
* async_timeout(), async_cancel(), and async_pending().
* async_start() starts management of a new asynchronous
* command on an interface, which should only be done after
* async_pending() is called to check that there are no
* pending asynchronous commands on that interface. when the
* command is completed, async_finish() should be called. all
* asynchronous commands have an associated timer, which calls
* async_timeout() when it times out. if async_timeout()
* decides that the asynchronous command should be cancelled
* (see below), it calls async_cancel() to attempt
* cancellation.
*
* asynchronous commands started by a user command have an
* associated ipc_action which provides the agent with
* information for how to get in touch with the user command
* when the action completes. these ipc_action records also
* have an associated timeout which may be infinite.
* ipc_action_start() should be called when starting an
* asynchronous command requested by a user, which sets up the
* timer and keeps track of the ipc information (file
* descriptor, request type). when the asynchronous command
* completes, ipc_action_finish() should be called to return a
* command status code to the user and close the ipc
* connection). if the command does not complete before the
* timer fires, ipc_action_timeout() is called which closes
* the ipc connection and returns DHCP_IPC_E_TIMEOUT to the
* user. note that independent of ipc_action_timeout(),
* ipc_action_finish() should be called.
*
* on a case-by-case basis, here is what happens (per interface):
*
* o when an asynchronous command is requested, then
* async_pending() is called to see if there is already
* an asynchronous event. if so, the command does not
* proceed, and if there is an associated ipc_action,
* the user command is sent DHCP_IPC_E_PEND.
*
* o otherwise, the the transaction is started with
* async_start(). if the transaction is on behalf
* of a user, ipc_action_start() is called to keep
* track of the ipc information and set up the
* ipc_action timer.
*
* o if the command completes normally and before a
* timeout fires, then async_finish() is called.
* if there was an associated ipc_action,
* ipc_action_finish() is called to complete it.
*
* o if the command fails before a timeout fires, then
* async_finish() is called, and the interface is
* is returned to a known state based on the command.
* if there was an associated ipc_action,
* ipc_action_finish() is called to complete it.
*
* o if the ipc_action timer fires before command
* completion, then DHCP_IPC_E_TIMEOUT is returned to
* the user. however, the transaction continues to
* be carried out asynchronously.
*
* o if async_timeout() fires before command completion,
* then if the command was internal to the agent, it
* is cancelled. otherwise, if it was a user command,
* then if the user is still waiting for the command
* to complete, the command continues and async_timeout()
* is rescheduled.
*/
switch (cmd) {
case DHCP_DROP: /* FALLTHRU */
case DHCP_RELEASE: /* FALLTHRU */
case DHCP_EXTEND: /* FALLTHRU */
case DHCP_INFORM: /* FALLTHRU */
case DHCP_START:
/*
* if shutdown request has been received, send back an error.
*/
if (shutdown_started) {
send_error_reply(request, DHCP_IPC_E_OUTSTATE, &fd);
return;
}
if (async_pending(ifsp)) {
send_error_reply(request, DHCP_IPC_E_PEND, &fd);
return;
}
if (ipc_action_start(ifsp, request, fd) == 0) {
dhcpmsg(MSG_WARNING, "ipc_event: ipc_action_start "
"failed for %s", ifsp->if_name);
send_error_reply(request, DHCP_IPC_E_MEMORY, &fd);
return;
}
if (async_start(ifsp, cmd, B_TRUE) == 0) {
ipc_action_finish(ifsp, DHCP_IPC_E_MEMORY);
return;
}
break;
default:
break;
}
switch (cmd) {
case DHCP_DROP:
(void) script_start(ifsp, EVENT_DROP, dhcp_drop, NULL, NULL);
return;
case DHCP_EXTEND:
(void) dhcp_extending(ifsp);
break;
case DHCP_GET_TAG: {
dhcp_optnum_t optnum;
DHCP_OPT *opt = NULL;
boolean_t did_alloc = B_FALSE;
PKT_LIST *ack = ifsp->if_ack;
/*
* verify the request makes sense.
*/
if (request->data_type != DHCP_TYPE_OPTNUM ||
request->data_length != sizeof (dhcp_optnum_t)) {
send_error_reply(request, DHCP_IPC_E_PROTO, &fd);
return;
}
(void) memcpy(&optnum, request->buffer, sizeof (dhcp_optnum_t));
load_option:
switch (optnum.category) {
case DSYM_SITE: /* FALLTHRU */
case DSYM_STANDARD:
if (optnum.code <= DHCP_LAST_OPT)
opt = ack->opts[optnum.code];
break;
case DSYM_VENDOR:
/*
* the test against VS_OPTION_START is broken up into
* two tests to avoid compiler warnings under intel.
*/
if ((optnum.code > VS_OPTION_START ||
optnum.code == VS_OPTION_START) &&
optnum.code <= VS_OPTION_END)
opt = ack->vs[optnum.code];
break;
case DSYM_FIELD:
if (optnum.code + optnum.size > sizeof (PKT))
break;
/* + 2 to account for option code and length byte */
opt = malloc(optnum.size + 2);
if (opt == NULL) {
send_error_reply(request, DHCP_IPC_E_MEMORY,
&fd);
return;
}
did_alloc = B_TRUE;
opt->len = optnum.size;
opt->code = optnum.code;
(void) memcpy(&opt->value, (caddr_t)ack->pkt +
opt->code, opt->len);
break;
default:
send_error_reply(request, DHCP_IPC_E_PROTO, &fd);
return;
}
/*
* return the option payload, if there was one. the "+ 2"
* accounts for the option code number and length byte.
*/
if (opt != NULL) {
send_data_reply(request, &fd, 0, DHCP_TYPE_OPTION, opt,
opt->len + 2);
if (did_alloc)
free(opt);
return;
} else if (ack != ifsp->if_orig_ack) {
/*
* There wasn't any definition for the option in the
* current ack, so now retry with the original ack if
* the original ack is not the current ack.
*/
ack = ifsp->if_orig_ack;
goto load_option;
}
/*
* note that an "okay" response is returned either in
* the case of an unknown option or a known option
* with no payload. this is okay (for now) since
* dhcpinfo checks whether an option is valid before
* ever performing ipc with the agent.
*/
send_ok_reply(request, &fd);
return;
}
case DHCP_INFORM:
dhcp_inform(ifsp);
/* next destination: dhcp_acknak() */
return;
case DHCP_PING:
if (ifsp->if_dflags & DHCP_IF_FAILED)
send_error_reply(request, DHCP_IPC_E_FAILEDIF, &fd);
else
send_ok_reply(request, &fd);
return;
case DHCP_RELEASE:
(void) script_start(ifsp, EVENT_RELEASE, dhcp_release,
"Finished with lease.", NULL);
return;
case DHCP_START:
(void) canonize_ifs(ifsp);
/*
* if we have a valid hostconf lying around, then jump
* into INIT_REBOOT. if it fails, we'll end up going
* through the whole selecting() procedure again.
*/
error = read_hostconf(ifsp->if_name, plp, 2);
if (error != -1) {
ifsp->if_orig_ack = ifsp->if_ack = plp[0];
if (error > 1) {
/*
* Return indicated we had more than one packet
* second one is the original ack. Older
* versions of the agent wrote only one ack
* to the file, we now keep both the first
* ack as well as the last one.
*/
ifsp->if_orig_ack = plp[1];
}
dhcp_init_reboot(ifsp);
/* next destination: dhcp_acknak() */
return;
}
/*
* if not debugging, wait for a few seconds before
* going into SELECTING.
*/
if (debug_level == 0) {
if (iu_schedule_timer_ms(tq,
lrand48() % DHCP_SELECT_WAIT, dhcp_start, ifsp)
!= -1) {
hold_ifs(ifsp);
/* next destination: dhcp_start() */
return;
}
}
dhcp_selecting(ifsp);
/* next destination: dhcp_requesting() */
return;
case DHCP_STATUS: {
dhcp_status_t status;
status.if_began = monosec_to_time(ifsp->if_curstart_monosec);
if (ifsp->if_lease == DHCP_PERM) {
status.if_t1 = DHCP_PERM;
status.if_t2 = DHCP_PERM;
status.if_lease = DHCP_PERM;
} else {
status.if_t1 = status.if_began + ifsp->if_t1;
status.if_t2 = status.if_began + ifsp->if_t2;
status.if_lease = status.if_began + ifsp->if_lease;
}
status.version = DHCP_STATUS_VER;
status.if_state = ifsp->if_state;
status.if_dflags = ifsp->if_dflags;
status.if_sent = ifsp->if_sent;
status.if_recv = ifsp->if_received;
status.if_bad_offers = ifsp->if_bad_offers;
(void) strlcpy(status.if_name, ifsp->if_name, IFNAMSIZ);
send_data_reply(request, &fd, 0, DHCP_TYPE_STATUS, &status,
sizeof (dhcp_status_t));
return;
}
default:
return;
}
}
/* ARGSUSED */
static void
ipc_event(iu_eh_t *ehp, int fd, short events, iu_event_id_t id, void *arg)
{
ipc_action_t ia, *iap;
dhcp_smach_t *dsmp;
int error, is_priv = (int)arg;
const char *ifname;
boolean_t isv6;
boolean_t dsm_created = B_FALSE;
ipc_action_init(&ia);
error = dhcp_ipc_recv_request(fd, &ia.ia_request,
DHCP_IPC_REQUEST_WAIT);
if (error != DHCP_IPC_SUCCESS) {
if (error != DHCP_IPC_E_EOF) {
dhcpmsg(MSG_ERROR,
"ipc_event: dhcp_ipc_recv_request failed: %s",
dhcp_ipc_strerror(error));
} else {
dhcpmsg(MSG_DEBUG, "ipc_event: connection closed");
}
if ((dsmp = lookup_smach_by_event(id)) != NULL) {
ipc_action_finish(dsmp, error);
} else {
(void) iu_unregister_event(eh, id, NULL);
(void) dhcp_ipc_close(fd);
}
return;
}
/* Fill in temporary ipc_action structure for utility functions */
ia.ia_cmd = DHCP_IPC_CMD(ia.ia_request->message_type);
ia.ia_fd = fd;
ia.ia_eid = id;
if (ia.ia_cmd >= DHCP_NIPC) {
dhcpmsg(MSG_ERROR,
"ipc_event: invalid command (%s) attempted on %s",
dhcp_ipc_type_to_string(ia.ia_cmd), ia.ia_request->ifname);
send_error_reply(&ia, DHCP_IPC_E_CMD_UNKNOWN);
return;
}
/* return EPERM for any of the privileged actions */
if (!is_priv && (ipc_cmd_flags[ia.ia_cmd] & CMD_ISPRIV)) {
dhcpmsg(MSG_WARNING,
"ipc_event: privileged ipc command (%s) attempted on %s",
dhcp_ipc_type_to_string(ia.ia_cmd), ia.ia_request->ifname);
send_error_reply(&ia, DHCP_IPC_E_PERM);
return;
}
/*
* Try to locate the state machine associated with this command. If
* the command is DHCP_START or DHCP_INFORM and there isn't a state
* machine already, make one (there may already be one from a previous
* failed attempt to START or INFORM). Otherwise, verify the reference
* is still valid.
*
* The interface name may be blank. In that case, we look up the
* primary interface, and the requested type (v4 or v6) doesn't matter.
*/
isv6 = (ia.ia_request->message_type & DHCP_V6) != 0;
ifname = ia.ia_request->ifname;
if (*ifname == '\0')
dsmp = primary_smach(isv6);
else
dsmp = lookup_smach(ifname, isv6);
if (dsmp != NULL) {
/* Note that verify_smach drops a reference */
hold_smach(dsmp);
if (!verify_smach(dsmp))
dsmp = NULL;
}
if (dsmp == NULL) {
/*
* If the user asked for the primary DHCP interface by giving
* an empty string and there is no primary, then check if we're
* handling dhcpinfo. If so, then simulate primary selection.
* Otherwise, report failure.
*/
if (ifname[0] == '\0') {
if (ia.ia_cmd == DHCP_GET_TAG)
dsmp = info_primary_smach(isv6);
if (dsmp == NULL)
error = DHCP_IPC_E_NOPRIMARY;
/*
* If there's no interface, and we're starting up, then create
* it now, along with a state machine for it. Note that if
* insert_smach fails, it discards the LIF reference.
*/
} else if (ipc_cmd_flags[ia.ia_cmd] & CMD_CREATE) {
dhcp_lif_t *lif;
lif = attach_lif(ifname, isv6, &error);
if (lif != NULL &&
(dsmp = insert_smach(lif, &error)) != NULL) {
/*
* Get client ID for logical interface. (V4
* only, because V6 plumbs its own interfaces.)
*/
error = get_smach_cid(dsmp);
if (error != DHCP_IPC_SUCCESS) {
remove_smach(dsmp);
dsmp = NULL;
}
dsm_created = (dsmp != NULL);
}
/*
* Otherwise, this is an operation on an unknown interface.
*/
} else {
error = DHCP_IPC_E_UNKIF;
}
if (dsmp == NULL) {
send_error_reply(&ia, error);
return;
}
}
/*
* If this is a request for DHCP to manage a lease on an address,
* ensure that IFF_DHCPRUNNING is set (we don't set this when the lif
* is created because the lif may have been created for INFORM).
*/
if (ia.ia_cmd == DHCP_START &&
(error = set_lif_dhcp(dsmp->dsm_lif)) != DHCP_IPC_SUCCESS) {
if (dsm_created)
remove_smach(dsmp);
send_error_reply(&ia, error);
return;
}
if ((dsmp->dsm_dflags & DHCP_IF_BOOTP) &&
!(ipc_cmd_flags[ia.ia_cmd] & CMD_BOOTP)) {
dhcpmsg(MSG_ERROR, "command %s not valid for BOOTP on %s",
dhcp_ipc_type_to_string(ia.ia_cmd), dsmp->dsm_name);
send_error_reply(&ia, DHCP_IPC_E_BOOTP);
return;
}
/*
* verify that the state machine is in a state which will allow the
* command. we do this up front so that we can return an error
* *before* needlessly cancelling an in-progress transaction.
*/
if (!check_cmd_allowed(dsmp->dsm_state, ia.ia_cmd)) {
dhcpmsg(MSG_DEBUG,
"in state %s; not allowing %s command on %s",
dhcp_state_to_string(dsmp->dsm_state),
dhcp_ipc_type_to_string(ia.ia_cmd), dsmp->dsm_name);
send_error_reply(&ia,
ia.ia_cmd == DHCP_START && dsmp->dsm_state != INIT ?
DHCP_IPC_E_RUNNING : DHCP_IPC_E_OUTSTATE);
return;
}
dhcpmsg(MSG_DEBUG, "in state %s; allowing %s command on %s",
dhcp_state_to_string(dsmp->dsm_state),
dhcp_ipc_type_to_string(ia.ia_cmd), dsmp->dsm_name);
if ((ia.ia_request->message_type & DHCP_PRIMARY) && is_priv)
make_primary(dsmp);
/*
* The current design dictates that there can be only one outstanding
* transaction per state machine -- this simplifies the code
* considerably and also fits well with RFCs 2131 and 3315. It is
* worth classifying the different DHCP commands into synchronous
* (those which we will handle now and reply to immediately) and
* asynchronous (those which require transactions and will be completed
* at an indeterminate time in the future):
*
* DROP: removes the agent's management of a state machine.
* asynchronous as the script program may be invoked.
*
* PING: checks to see if the agent has a named state machine.
* synchronous, since no packets need to be sent
* to the DHCP server.
*
* STATUS: returns information about a state machine.
* synchronous, since no packets need to be sent
* to the DHCP server.
*
* RELEASE: releases the agent's management of a state machine
* and brings the associated interfaces down. asynchronous
* as the script program may be invoked.
*
* EXTEND: renews a lease. asynchronous, since the agent
* needs to wait for an ACK, etc.
*
* START: starts DHCP on a named state machine. asynchronous since
* the agent needs to wait for OFFERs, ACKs, etc.
*
* INFORM: obtains configuration parameters for the system using
* externally configured interface. asynchronous, since the
* agent needs to wait for an ACK.
*
* Notice that EXTEND, INFORM, START, DROP and RELEASE are
* asynchronous. Notice also that asynchronous commands may occur from
* within the agent -- for instance, the agent will need to do implicit
* EXTENDs to extend the lease. In order to make the code simpler, the
* following rules apply for asynchronous commands:
*
* There can only be one asynchronous command at a time per state
* machine. The current asynchronous command is managed by the async_*
* api: async_start(), async_finish(), and async_cancel().
* async_start() starts management of a new asynchronous command on an
* state machine, which should only be done after async_cancel() to
* terminate a previous command. When the command is completed,
* async_finish() should be called.
*
* Asynchronous commands started by a user command have an associated
* ipc_action which provides the agent with information for how to get
* in touch with the user command when the action completes. These
* ipc_action records also have an associated timeout which may be
* infinite. ipc_action_start() should be called when starting an
* asynchronous command requested by a user, which sets up the timer
* and keeps track of the ipc information (file descriptor, request
* type). When the asynchronous command completes, ipc_action_finish()
* should be called to return a command status code to the user and
* close the ipc connection). If the command does not complete before
* the timer fires, ipc_action_timeout() is called which closes the ipc
* connection and returns DHCP_IPC_E_TIMEOUT to the user. Note that
* independent of ipc_action_timeout(), ipc_action_finish() should be
* called.
*
* on a case-by-case basis, here is what happens (per state machine):
*
* o When an asynchronous command is requested, then
* async_cancel() is called to terminate any non-user
* action in progress. If there's a user action running,
* the user command is sent DHCP_IPC_E_PEND.
*
* o otherwise, the the transaction is started with
* async_start(). if the transaction is on behalf
* of a user, ipc_action_start() is called to keep
* track of the ipc information and set up the
* ipc_action timer.
*
* o if the command completes normally and before a
* timeout fires, then async_finish() is called.
* if there was an associated ipc_action,
* ipc_action_finish() is called to complete it.
*
* o if the command fails before a timeout fires, then
* async_finish() is called, and the state machine is
* is returned to a known state based on the command.
* if there was an associated ipc_action,
* ipc_action_finish() is called to complete it.
*
* o if the ipc_action timer fires before command
* completion, then DHCP_IPC_E_TIMEOUT is returned to
* the user. however, the transaction continues to
* be carried out asynchronously.
*/
if (ipc_cmd_flags[ia.ia_cmd] & CMD_IMMED) {
/*
* Only immediate commands (ping, status, get_tag) need to
* worry about freeing ia through one of the reply functions
* before returning.
*/
iap = &ia;
} else {
/*
* if shutdown request has been received, send back an error.
*/
if (shutdown_started) {
send_error_reply(&ia, DHCP_IPC_E_OUTSTATE);
return;
}
if (dsmp->dsm_dflags & DHCP_IF_BUSY) {
send_error_reply(&ia, DHCP_IPC_E_PEND);
return;
}
if (!ipc_action_start(dsmp, &ia)) {
dhcpmsg(MSG_WARNING, "ipc_event: ipc_action_start "
"failed for %s", dsmp->dsm_name);
send_error_reply(&ia, DHCP_IPC_E_MEMORY);
return;
}
/* Action structure consumed by above function */
iap = &dsmp->dsm_ia;
}
switch (iap->ia_cmd) {
case DHCP_DROP:
if (dsmp->dsm_droprelease)
break;
dsmp->dsm_droprelease = B_TRUE;
/*
* Ensure that a timer associated with the existing state
* doesn't pop while we're waiting for the script to complete.
* (If so, chaos can result -- e.g., a timer causes us to end
* up in dhcp_selecting() would start acquiring a new lease on
* dsmp while our DHCP_DROP dismantling is ongoing.)
*/
cancel_smach_timers(dsmp);
(void) script_start(dsmp, isv6 ? EVENT_DROP6 : EVENT_DROP,
dhcp_drop, NULL, NULL);
break; /* not an immediate function */
case DHCP_EXTEND:
dhcp_smach_set_msg_reqhost(dsmp, iap);
(void) dhcp_extending(dsmp);
break;
case DHCP_GET_TAG: {
dhcp_optnum_t optnum;
void *opt = NULL;
uint_t optlen;
boolean_t did_alloc = B_FALSE;
PKT_LIST *ack = dsmp->dsm_ack;
int i;
/*
* verify the request makes sense.
*/
if (iap->ia_request->data_type != DHCP_TYPE_OPTNUM ||
iap->ia_request->data_length != sizeof (dhcp_optnum_t)) {
send_error_reply(iap, DHCP_IPC_E_PROTO);
break;
}
(void) memcpy(&optnum, iap->ia_request->buffer,
sizeof (dhcp_optnum_t));
load_option:
switch (optnum.category) {
case DSYM_SITE: /* FALLTHRU */
case DSYM_STANDARD:
for (i = 0; i < dsmp->dsm_pillen; i++) {
if (dsmp->dsm_pil[i] == optnum.code)
break;
}
if (i < dsmp->dsm_pillen)
break;
if (isv6) {
opt = dhcpv6_pkt_option(ack, NULL, optnum.code,
NULL);
} else {
opt = dhcp_get_ack_or_state(dsmp, ack,
optnum.code, &did_alloc);
}
break;
case DSYM_VENDOR:
if (isv6) {
dhcpv6_option_t *d6o;
uint32_t ent;
/*
* Look through vendor options to find our
* enterprise number.
*/
d6o = NULL;
for (;;) {
d6o = dhcpv6_pkt_option(ack, d6o,
DHCPV6_OPT_VENDOR_OPT, &optlen);
if (d6o == NULL)
break;
optlen -= sizeof (*d6o);
if (optlen < sizeof (ent))
continue;
(void) memcpy(&ent, d6o + 1,
sizeof (ent));
if (ntohl(ent) != DHCPV6_SUN_ENT)
continue;
break;
}
if (d6o != NULL) {
/*
* Now find the requested vendor option
* within the vendor options block.
*/
opt = dhcpv6_find_option(
(char *)(d6o + 1) + sizeof (ent),
optlen - sizeof (ent), NULL,
optnum.code, NULL);
}
} else {
/*
* the test against VS_OPTION_START is broken
* up into two tests to avoid compiler warnings
* under intel.
*/
if ((optnum.code > VS_OPTION_START ||
optnum.code == VS_OPTION_START) &&
optnum.code <= VS_OPTION_END)
opt = ack->vs[optnum.code];
}
break;
case DSYM_FIELD:
if (isv6) {
dhcpv6_message_t *d6m =
(dhcpv6_message_t *)ack->pkt;
dhcpv6_option_t *d6o;
/* Validate the packet field the user wants */
optlen = optnum.code + optnum.size;
if (d6m->d6m_msg_type ==
DHCPV6_MSG_RELAY_FORW ||
d6m->d6m_msg_type ==
DHCPV6_MSG_RELAY_REPL) {
if (optlen > sizeof (dhcpv6_relay_t))
break;
} else {
if (optlen > sizeof (*d6m))
break;
}
opt = malloc(sizeof (*d6o) + optnum.size);
if (opt != NULL) {
d6o = opt;
d6o->d6o_code = htons(optnum.code);
d6o->d6o_len = htons(optnum.size);
(void) memcpy(d6o + 1, (caddr_t)d6m +
optnum.code, optnum.size);
}
} else {
if (optnum.code + optnum.size > sizeof (PKT))
break;
opt = malloc(optnum.size + DHCP_OPT_META_LEN);
if (opt != NULL) {
DHCP_OPT *v4opt = opt;
v4opt->len = optnum.size;
v4opt->code = optnum.code;
(void) memcpy(v4opt->value,
(caddr_t)ack->pkt + optnum.code,
optnum.size);
}
}
if (opt == NULL) {
send_error_reply(iap, DHCP_IPC_E_MEMORY);
return;
}
did_alloc = B_TRUE;
break;
default:
send_error_reply(iap, DHCP_IPC_E_PROTO);
return;
}
/*
* return the option payload, if there was one.
*/
if (opt != NULL) {
if (isv6) {
dhcpv6_option_t d6ov;
(void) memcpy(&d6ov, opt, sizeof (d6ov));
optlen = ntohs(d6ov.d6o_len) + sizeof (d6ov);
} else {
optlen = ((DHCP_OPT *)opt)->len +
DHCP_OPT_META_LEN;
}
send_data_reply(iap, 0, DHCP_TYPE_OPTION, opt, optlen);
if (did_alloc)
free(opt);
break;
} else if (ack != dsmp->dsm_orig_ack) {
/*
* There wasn't any definition for the option in the
* current ack, so now retry with the original ack if
* the original ack is not the current ack.
*/
ack = dsmp->dsm_orig_ack;
goto load_option;
}
/*
* note that an "okay" response is returned either in
* the case of an unknown option or a known option
* with no payload. this is okay (for now) since
* dhcpinfo checks whether an option is valid before
* ever performing ipc with the agent.
*/
send_ok_reply(iap);
break;
}
case DHCP_INFORM:
dhcp_inform(dsmp);
/* next destination: dhcp_acknak() */
break; /* not an immediate function */
case DHCP_PING:
if (dsmp->dsm_dflags & DHCP_IF_FAILED)
send_error_reply(iap, DHCP_IPC_E_FAILEDIF);
else
send_ok_reply(iap);
break;
case DHCP_RELEASE:
if (dsmp->dsm_droprelease)
break;
dsmp->dsm_droprelease = B_TRUE;
cancel_smach_timers(dsmp); /* see comment in DHCP_DROP above */
(void) script_start(dsmp, isv6 ? EVENT_RELEASE6 :
EVENT_RELEASE, dhcp_release, "Finished with lease.", NULL);
break; /* not an immediate function */
case DHCP_START: {
PKT_LIST *ack, *oack;
PKT_LIST *plp[2];
deprecate_leases(dsmp);
dhcp_smach_set_msg_reqhost(dsmp, iap);
/*
* if we have a valid hostconf lying around, then jump
* into INIT_REBOOT. if it fails, we'll end up going
* through the whole selecting() procedure again.
*/
error = read_hostconf(dsmp->dsm_name, plp, 2, dsmp->dsm_isv6);
ack = error > 0 ? plp[0] : NULL;
oack = error > 1 ? plp[1] : NULL;
/*
* If the allocation of the old ack fails, that's fine;
* continue without it.
*/
if (oack == NULL)
oack = ack;
/*
* As long as we've allocated something, start using it.
*/
if (ack != NULL) {
dsmp->dsm_orig_ack = oack;
dsmp->dsm_ack = ack;
dhcp_init_reboot(dsmp);
/* next destination: dhcp_acknak() */
break;
}
/*
* if not debugging, wait for a few seconds before
* going into SELECTING.
*/
if (debug_level != 0 || !set_start_timer(dsmp)) {
dhcp_selecting(dsmp);
/* next destination: dhcp_requesting() */
}
/* else next destination: dhcp_start() */
}
break;
case DHCP_STATUS: {
dhcp_status_t status;
dhcp_lease_t *dlp;
status.if_began = monosec_to_time(dsmp->dsm_curstart_monosec);
/*
* We return information on just the first lease as being
* representative of the lot. A better status mechanism is
* needed.
*/
dlp = dsmp->dsm_leases;
if (dlp == NULL ||
dlp->dl_lifs->lif_expire.dt_start == DHCP_PERM) {
status.if_t1 = DHCP_PERM;
status.if_t2 = DHCP_PERM;
status.if_lease = DHCP_PERM;
} else {
status.if_t1 = status.if_began +
dlp->dl_t1.dt_start;
status.if_t2 = status.if_began +
dlp->dl_t2.dt_start;
status.if_lease = status.if_began +
dlp->dl_lifs->lif_expire.dt_start;
}
status.version = DHCP_STATUS_VER;
status.if_state = dsmp->dsm_state;
status.if_dflags = dsmp->dsm_dflags;
status.if_sent = dsmp->dsm_sent;
status.if_recv = dsmp->dsm_received;
status.if_bad_offers = dsmp->dsm_bad_offers;
(void) strlcpy(status.if_name, dsmp->dsm_name, LIFNAMSIZ);
send_data_reply(iap, 0, DHCP_TYPE_STATUS, &status,
sizeof (dhcp_status_t));
break;
}
}
}
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);
}
