/* 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
accept_v6_message(dhcp_smach_t *dsmp, PKT_LIST *plp, const char *pname,
uchar_t recv_type)
{
const dhcpv6_option_t *d6o;
uint_t olen;
const char *estr, *msg;
uint_t msglen;
int status;
/* Account for received and processed messages */
dsmp->dsm_received++;
/* We don't yet support Reconfigure at all. */
if (recv_type == DHCPV6_MSG_RECONFIGURE) {
dhcpmsg(MSG_VERBOSE, "accept_v6_message: ignored Reconfigure "
"on %s", dsmp->dsm_name);
free_pkt_entry(plp);
return;
}
/*
* All valid DHCPv6 messages must have our Client ID specified.
*/
d6o = dhcpv6_pkt_option(plp, NULL, DHCPV6_OPT_CLIENTID, &olen);
olen -= sizeof (*d6o);
if (d6o == NULL || olen != dsmp->dsm_cidlen ||
memcmp(d6o + 1, dsmp->dsm_cid, olen) != 0) {
dhcpmsg(MSG_VERBOSE,
"accept_v6_message: discarded %s on %s: %s Client ID",
pname, dsmp->dsm_name, d6o == NULL ? "no" : "wrong");
free_pkt_entry(plp);
return;
}
/*
* All valid DHCPv6 messages must have a Server ID specified.
*
* If this is a Reply and it's not in response to Solicit, Confirm,
* Rebind, or Information-Request, then it must also match the Server
* ID we're expecting.
*
* For Reply in the Solicit, Confirm, Rebind, and Information-Request
* cases, the Server ID needs to be saved. This is done inside of
* dhcp_bound().
*/
d6o = dhcpv6_pkt_option(plp, NULL, DHCPV6_OPT_SERVERID, &olen);
if (d6o == NULL) {
dhcpmsg(MSG_DEBUG,
"accept_v6_message: discarded %s on %s: no Server ID",
pname, dsmp->dsm_name);
free_pkt_entry(plp);
return;
}
if (recv_type == DHCPV6_MSG_REPLY && dsmp->dsm_state != SELECTING &&
dsmp->dsm_state != INIT_REBOOT && dsmp->dsm_state != REBINDING &&
dsmp->dsm_state != INFORM_SENT) {
olen -= sizeof (*d6o);
if (olen != dsmp->dsm_serveridlen ||
memcmp(d6o + 1, dsmp->dsm_serverid, olen) != 0) {
dhcpmsg(MSG_DEBUG, "accept_v6_message: discarded %s on "
"%s: wrong Server ID", pname, dsmp->dsm_name);
free_pkt_entry(plp);
return;
}
}
/*
* Break out of the switch if the input message needs to be discarded.
* Return from the function if the message has been enqueued or
* consumed.
*/
switch (dsmp->dsm_state) {
case SELECTING:
/* A Reply message signifies a Rapid-Commit. */
if (recv_type == DHCPV6_MSG_REPLY) {
if (dhcpv6_pkt_option(plp, NULL,
DHCPV6_OPT_RAPID_COMMIT, &olen) == NULL) {
dhcpmsg(MSG_DEBUG, "accept_v6_message: Reply "
"on %s lacks Rapid-Commit; ignoring",
dsmp->dsm_name);
break;
}
dhcpmsg(MSG_VERBOSE,
"accept_v6_message: rapid-commit Reply on %s",
dsmp->dsm_name);
cancel_offer_timer(dsmp);
goto rapid_commit;
}
/* Otherwise, we're looking for Advertisements. */
if (recv_type != DHCPV6_MSG_ADVERTISE)
break;
/*
* Special case: if this advertisement has preference 255, then
* we must stop right now and select this server.
*/
d6o = dhcpv6_pkt_option(plp, NULL, DHCPV6_OPT_PREFERENCE,
&olen);
if (d6o != NULL && olen == sizeof (*d6o) + 1 &&
*(const uchar_t *)(d6o + 1) == 255) {
pkt_smach_enqueue(dsmp, plp);
dhcpmsg(MSG_DEBUG, "accept_v6_message: preference 255;"
" immediate Request on %s", dsmp->dsm_name);
dhcp_requesting(NULL, dsmp);
} else {
pkt_smach_enqueue(dsmp, plp);
}
return;
case PRE_BOUND:
case BOUND:
/*
* Not looking for anything in these states. (If we
* implemented reconfigure, that might go here.)
*/
break;
case REQUESTING:
case INIT_REBOOT:
case RENEWING:
case REBINDING:
case INFORM_SENT:
/*
* We're looking for Reply messages.
*/
if (recv_type != DHCPV6_MSG_REPLY)
break;
dhcpmsg(MSG_VERBOSE,
"accept_v6_message: received Reply message on %s",
dsmp->dsm_name);
rapid_commit:
/*
* Extract the status code option. If one is present and the
* request failed, then try to go to another advertisement in
* the list or restart the selection machinery.
*/
d6o = dhcpv6_pkt_option(plp, NULL, DHCPV6_OPT_STATUS_CODE,
&olen);
status = dhcpv6_status_code(d6o, olen, &estr, &msg, &msglen);
/*
* Check for the UseMulticast status code. If this is present,
* and if we were actually using unicast, then drop back and
* try again. If we weren't using unicast, then just pretend
* we never saw this message -- the peer is confused. (TAHI
* does this.)
*/
if (status == DHCPV6_STAT_USEMCAST) {
if (IN6_IS_ADDR_MULTICAST(
&dsmp->dsm_send_dest.v6.sin6_addr)) {
break;
} else {
free_pkt_entry(plp);
dsmp->dsm_send_dest.v6.sin6_addr =
ipv6_all_dhcp_relay_and_servers;
retransmit_now(dsmp);
return;
}
}
print_server_msg(dsmp, msg, msglen);
/*
* We treat NoBinding at the top level as "success." Granted,
* this doesn't make much sense, but the TAHI test suite does
* this. NoBinding really only makes sense in the context of a
* specific IA, as it refers to the GUID:IAID binding, so
* ignoring it at the top level is safe.
*/
if (status == DHCPV6_STAT_SUCCESS ||
status == DHCPV6_STAT_NOBINDING) {
if (dhcp_bound(dsmp, plp)) {
/*
* dhcp_bound will stop retransmission on
* success, if that's called for.
*/
server_unicast_option(dsmp, plp);
} else {
stop_pkt_retransmission(dsmp);
dhcpmsg(MSG_WARNING, "accept_v6_message: "
"dhcp_bound failed for %s", dsmp->dsm_name);
(void) remove_hostconf(dsmp->dsm_name,
dsmp->dsm_isv6);
dhcp_restart(dsmp);
}
} else {
dhcpmsg(MSG_WARNING, "accept_v6_message: Reply: %s",
estr);
stop_pkt_retransmission(dsmp);
free_pkt_entry(plp);
if (dsmp->dsm_state == INFORM_SENT) {
(void) set_smach_state(dsmp, INIT);
ipc_action_finish(dsmp, DHCP_IPC_E_SRVFAILED);
} else {
(void) remove_hostconf(dsmp->dsm_name,
dsmp->dsm_isv6);
request_failed(dsmp);
}
}
return;
case DECLINING:
/*
* We're looking for Reply messages.
*/
if (recv_type != DHCPV6_MSG_REPLY)
break;
stop_pkt_retransmission(dsmp);
/*
* Extract the status code option. Note that it's not a
* failure if the server reports an error.
*/
d6o = dhcpv6_pkt_option(plp, NULL, DHCPV6_OPT_STATUS_CODE,
&olen);
if (dhcpv6_status_code(d6o, olen, &estr, &msg,
&msglen) == DHCPV6_STAT_SUCCESS) {
print_server_msg(dsmp, msg, msglen);
} else {
dhcpmsg(MSG_WARNING, "accept_v6_message: Reply: %s",
estr);
}
free_pkt_entry(plp);
if (dsmp->dsm_leases == NULL) {
dhcpmsg(MSG_VERBOSE, "accept_v6_message: %s has no "
"leases left", dsmp->dsm_name);
dhcp_restart(dsmp);
} else if (dsmp->dsm_lif_wait == 0) {
(void) set_smach_state(dsmp, BOUND);
} else {
(void) set_smach_state(dsmp, PRE_BOUND);
}
return;
case RELEASING:
/*
* We're looking for Reply messages.
*/
if (recv_type != DHCPV6_MSG_REPLY)
break;
stop_pkt_retransmission(dsmp);
/*
* Extract the status code option.
*/
d6o = dhcpv6_pkt_option(plp, NULL, DHCPV6_OPT_STATUS_CODE,
&olen);
if (dhcpv6_status_code(d6o, olen, &estr, &msg,
&msglen) == DHCPV6_STAT_SUCCESS) {
print_server_msg(dsmp, msg, msglen);
} else {
dhcpmsg(MSG_WARNING, "accept_v6_message: Reply: %s",
estr);
}
free_pkt_entry(plp);
finished_smach(dsmp, DHCP_IPC_SUCCESS);
return;
}
/*
* Break from above switch means that the message must be discarded.
*/
dhcpmsg(MSG_VERBOSE,
"accept_v6_message: discarded v6 %s on %s; state %s",
pname, dsmp->dsm_name, dhcp_state_to_string(dsmp->dsm_state));
free_pkt_entry(plp);
}
/* ARGSUSED */
static void
rtsock_event(iu_eh_t *ehp, int fd, short events, iu_event_id_t id, void *arg)
{
dhcp_smach_t *dsmp, *dsmnext;
union {
struct ifa_msghdr ifam;
struct if_msghdr ifm;
char buf[1024];
} msg;
uint16_t ifindex;
int msglen;
boolean_t isv6;
if ((msglen = read(fd, &msg, sizeof (msg))) <= 0)
return;
/* Note that the routing socket interface index is just 16 bits */
if (msg.ifm.ifm_type == RTM_IFINFO) {
ifindex = msg.ifm.ifm_index;
isv6 = (msg.ifm.ifm_flags & IFF_IPV6) ? B_TRUE : B_FALSE;
} else if (msg.ifam.ifam_type == RTM_DELADDR ||
msg.ifam.ifam_type == RTM_NEWADDR) {
ifindex = msg.ifam.ifam_index;
isv6 = is_rtm_v6(&msg.ifam, msglen);
} else {
return;
}
for (dsmp = lookup_smach_by_uindex(ifindex, NULL, isv6);
dsmp != NULL; dsmp = dsmnext) {
DHCPSTATE oldstate;
boolean_t lif_finished;
boolean_t lease_removed;
dhcp_lease_t *dlp, *dlnext;
/*
* Note that script_start can call dhcp_drop directly, and
* that will do release_smach.
*/
dsmnext = lookup_smach_by_uindex(ifindex, dsmp, isv6);
oldstate = dsmp->dsm_state;
/*
* Ignore state machines that are currently processing drop or
* release; there is nothing more we can do for them.
*/
if (dsmp->dsm_droprelease)
continue;
/*
* Look for link up/down notifications. These occur on a
* physical interface basis.
*/
if (msg.ifm.ifm_type == RTM_IFINFO) {
process_link_up_down(dsmp->dsm_lif->lif_pif, &msg.ifm);
continue;
}
/*
* Since we cannot trust the flags reported by the routing
* socket (they're just 32 bits -- and thus never include
* IFF_DUPLICATE), and we can't trust the ifindex (it's only 16
* bits and also doesn't reflect the alias in use), we get
* flags on all matching interfaces, and go by that.
*/
lif_finished = B_FALSE;
lease_removed = B_FALSE;
for (dlp = dsmp->dsm_leases; dlp != NULL; dlp = dlnext) {
dhcp_lif_t *lif, *lifnext;
uint_t nlifs = dlp->dl_nlifs;
dlnext = dlp->dl_next;
for (lif = dlp->dl_lifs; lif != NULL && nlifs > 0;
lif = lifnext, nlifs--) {
lifnext = lif->lif_next;
if (check_lif(lif, &msg.ifam, msglen)) {
dsmp->dsm_lif_wait--;
lif_finished = B_TRUE;
}
}
if (dlp->dl_nlifs == 0) {
remove_lease(dlp);
lease_removed = B_TRUE;
}
}
if ((isv6 && !check_main_lif(dsmp, &msg.ifam, msglen)) ||
(!isv6 && !verify_lif(dsmp->dsm_lif))) {
finished_smach(dsmp, DHCP_IPC_E_INVIF);
continue;
}
/*
* Ignore this state machine if nothing interesting has
* happened.
*/
if (!lif_finished && dsmp->dsm_lif_down == 0 &&
(dsmp->dsm_leases != NULL || !lease_removed))
continue;
/*
* If we're still waiting for DAD to complete on some of the
* configured LIFs, then don't send a response.
*/
if (dsmp->dsm_lif_wait != 0) {
dhcpmsg(MSG_VERBOSE, "rtsock_event: %s still has %d "
"LIFs waiting on DAD", dsmp->dsm_name,
dsmp->dsm_lif_wait);
continue;
}
/*
* If we have some failed LIFs, then handle them now. We'll
* remove them from the list. Any leases that become empty are
* also removed as part of the decline-generation process.
*/
if (dsmp->dsm_lif_down != 0)
send_declines(dsmp);
if (dsmp->dsm_leases == NULL) {
dsmp->dsm_bad_offers++;
/*
* For DHCPv6, we'll process the restart once we're
* done sending Decline messages, because these are
* supposed to be acknowledged. With DHCPv4, there's
* no acknowledgment for a DECLINE, so after sending
* it, we just restart right away.
*/
if (!dsmp->dsm_isv6) {
dhcpmsg(MSG_VERBOSE, "rtsock_event: %s has no "
"LIFs left", dsmp->dsm_name);
dhcp_restart(dsmp);
}
} else {
/*
* If we're now up on at least some of the leases and
* we were waiting for that, then kick off the rest of
* configuration. Lease validation and DAD are done.
*/
dhcpmsg(MSG_VERBOSE, "rtsock_event: all LIFs verified "
"on %s in %s state", dsmp->dsm_name,
dhcp_state_to_string(oldstate));
if (oldstate == PRE_BOUND ||
oldstate == ADOPTING)
dhcp_bound_complete(dsmp);
if (oldstate == ADOPTING)
dhcp_adopt_complete(dsmp);
}
}
}
