/* ARGSUSED */
void
dhcp_renew(iu_tq_t *tqp, void *arg)
{
dhcp_lease_t *dlp = arg;
dhcp_smach_t *dsmp = dlp->dl_smach;
uint32_t t2;
dhcpmsg(MSG_VERBOSE, "dhcp_renew: T1 timer expired on %s",
dsmp->dsm_name);
dlp->dl_t1.dt_id = -1;
if (dsmp->dsm_state == RENEWING || dsmp->dsm_state == REBINDING) {
dhcpmsg(MSG_DEBUG, "dhcp_renew: already renewing");
release_lease(dlp);
return;
}
/*
* Sanity check: don't send packets if we're past T2, or if we're
* extremely close.
*/
t2 = dsmp->dsm_curstart_monosec + dlp->dl_t2.dt_start;
if (monosec() + TOO_CLOSE >= t2) {
dhcpmsg(MSG_DEBUG, "dhcp_renew: %spast T2 on %s",
monosec() > t2 ? "" : "almost ", dsmp->dsm_name);
release_lease(dlp);
return;
}
/*
* If there isn't an async event pending, or if we can cancel the one
* that's there, then try to renew by sending an extension request. If
* that fails, we'll try again when the next timer fires.
*/
if (!async_cancel(dsmp) || !async_start(dsmp, DHCP_EXTEND, B_FALSE) ||
!dhcp_extending(dsmp)) {
if (monosec() + RETRY_DELAY < t2) {
/*
* Try again in RETRY_DELAY seconds; user command
* should be gone.
*/
init_timer(&dlp->dl_t1, RETRY_DELAY);
(void) set_smach_state(dsmp, BOUND);
if (!schedule_lease_timer(dlp, &dlp->dl_t1,
dhcp_renew)) {
dhcpmsg(MSG_INFO, "dhcp_renew: unable to "
"reschedule renewal around user command "
"on %s; will wait for rebind",
dsmp->dsm_name);
}
} else {
dhcpmsg(MSG_DEBUG, "dhcp_renew: user busy on %s; will "
"wait for rebind", dsmp->dsm_name);
}
}
release_lease(dlp);
}
static uint32_t
next_extend_time(monosec_t limit_monosec)
{
monosec_t current_monosec = monosec();
if (limit_monosec - current_monosec < DHCP_REBIND_MIN)
return (0);
return ((limit_monosec - current_monosec) / 2);
}
/* ARGSUSED */
static boolean_t
stop_extending(dhcp_smach_t *dsmp, unsigned int n_requests)
{
dhcp_lease_t *dlp;
/*
* If we're renewing and rebind time is soon approaching, then don't
* schedule
*/
if (dsmp->dsm_state == RENEWING) {
monosec_t t2;
t2 = 0;
for (dlp = dsmp->dsm_leases; dlp != NULL; dlp = dlp->dl_next) {
if (dlp->dl_t2.dt_start > t2)
t2 = dlp->dl_t2.dt_start;
}
t2 += dsmp->dsm_curstart_monosec;
if (monosec() + TOO_CLOSE >= t2) {
dhcpmsg(MSG_DEBUG, "stop_extending: %spast T2 on %s",
monosec() > t2 ? "" : "almost ", dsmp->dsm_name);
return (B_TRUE);
}
}
/*
* Note that returning B_TRUE cancels both this transmission and the
* one that would occur at dsm_send_timeout, and that for v4 we cut the
* time in half for each retransmission. Thus we check here against
* half of the minimum.
*/
if (!dsmp->dsm_isv6 &&
dsmp->dsm_send_timeout < DHCP_REBIND_MIN * MILLISEC / 2) {
dhcpmsg(MSG_DEBUG, "stop_extending: next retry would be in "
"%d.%03d; stopping", dsmp->dsm_send_timeout / MILLISEC,
dsmp->dsm_send_timeout % MILLISEC);
return (B_TRUE);
}
/* Otherwise, w stop only when the next timer (rebind, expire) fires */
return (B_FALSE);
}
/* ARGSUSED */
void
dhcp_renew(iu_tq_t *tqp, void *arg)
{
struct ifslist *ifsp = (struct ifslist *)arg;
uint32_t next;
ifsp->if_timer[DHCP_T1_TIMER] = -1;
if (check_ifs(ifsp) == 0) {
(void) release_ifs(ifsp);
return;
}
/*
* sanity check: don't send packets if we're past t2.
*/
if (monosec() > (ifsp->if_curstart_monosec + ifsp->if_t2))
return;
next = next_extend_time(ifsp->if_curstart_monosec + ifsp->if_t2);
/*
* if there isn't an async event pending, then try to renew.
*/
if (!async_pending(ifsp))
if (async_start(ifsp, DHCP_EXTEND, B_FALSE) != 0)
/*
* try to send extend. if we don't succeed,
* async_timeout() will clean us up.
*/
(void) dhcp_extending(ifsp);
/*
* if we're within DHCP_REBIND_MIN seconds of REBINDING, don't
* reschedule ourselves.
*/
if (next == 0)
return;
/*
* no big deal if we can't reschedule; we still have the REBIND
* state to save us.
*/
(void) schedule_ifs_timer(ifsp, DHCP_T1_TIMER, next, dhcp_renew);
}
/* ARGSUSED */
void
dhcp_rebind(iu_tq_t *tqp, void *arg)
{
dhcp_lease_t *dlp = arg;
dhcp_smach_t *dsmp = dlp->dl_smach;
int nlifs;
dhcp_lif_t *lif;
boolean_t some_valid;
uint32_t expiremax;
DHCPSTATE oldstate;
dhcpmsg(MSG_VERBOSE, "dhcp_rebind: T2 timer expired on %s",
dsmp->dsm_name);
dlp->dl_t2.dt_id = -1;
if ((oldstate = dsmp->dsm_state) == REBINDING) {
dhcpmsg(MSG_DEBUG, "dhcp_renew: already rebinding");
release_lease(dlp);
return;
}
/*
* Sanity check: don't send packets if we've already expired on all of
* the addresses. We compute the maximum expiration time here, because
* it won't matter for v4 (there's only one lease) and for v6 we need
* to know when the last lease ages away.
*/
some_valid = B_FALSE;
expiremax = monosec();
lif = dlp->dl_lifs;
for (nlifs = dlp->dl_nlifs; nlifs > 0; nlifs--, lif = lif->lif_next) {
uint32_t expire;
expire = dsmp->dsm_curstart_monosec + lif->lif_expire.dt_start;
if (expire > expiremax) {
expiremax = expire;
some_valid = B_TRUE;
}
}
if (!some_valid) {
dhcpmsg(MSG_DEBUG, "dhcp_rebind: all leases expired on %s",
dsmp->dsm_name);
release_lease(dlp);
return;
}
/*
* This is our first venture into the REBINDING state, so reset the
* server address. We know the renew timer has already been cancelled
* (or we wouldn't be here).
*/
if (dsmp->dsm_isv6) {
dsmp->dsm_server = ipv6_all_dhcp_relay_and_servers;
} else {
IN6_IPADDR_TO_V4MAPPED(htonl(INADDR_BROADCAST),
&dsmp->dsm_server);
}
/* {Bound,Renew}->rebind transitions cannot fail */
(void) set_smach_state(dsmp, REBINDING);
/*
* If there isn't an async event pending, or if we can cancel the one
* that's there, then try to rebind by sending an extension request.
* If that fails, we'll clean up when the lease expires.
*/
if (!async_cancel(dsmp) || !async_start(dsmp, DHCP_EXTEND, B_FALSE) ||
!dhcp_extending(dsmp)) {
if (monosec() + RETRY_DELAY < expiremax) {
/*
* Try again in RETRY_DELAY seconds; user command
* should be gone.
*/
init_timer(&dlp->dl_t2, RETRY_DELAY);
(void) set_smach_state(dsmp, oldstate);
if (!schedule_lease_timer(dlp, &dlp->dl_t2,
dhcp_rebind)) {
dhcpmsg(MSG_INFO, "dhcp_rebind: unable to "
"reschedule rebind around user command on "
"%s; lease may expire", dsmp->dsm_name);
}
} else {
dhcpmsg(MSG_WARNING, "dhcp_rebind: user busy on %s; "
"will expire", dsmp->dsm_name);
}
}
release_lease(dlp);
}
time_t
monosec_to_time(monosec_t abs_monosec)
{
return (abs_monosec - monosec()) + time(NULL);
}
int
dhcp_extending(struct ifslist *ifsp)
{
dhcp_pkt_t *dpkt;
if (ifsp->if_state == BOUND) {
ifsp->if_neg_monosec = monosec();
ifsp->if_state = RENEWING;
ifsp->if_bad_offers = 0;
ifsp->if_sent = 0;
ifsp->if_received = 0;
}
dhcpmsg(MSG_DEBUG, "dhcp_extending: registering dhcp_acknak on %s",
ifsp->if_name);
if (register_acknak(ifsp) == 0) {
ipc_action_finish(ifsp, DHCP_IPC_E_MEMORY);
async_finish(ifsp);
dhcpmsg(MSG_WARNING, "dhcp_extending: cannot register "
"dhcp_acknak for %s, not sending renew request",
ifsp->if_name);
return (0);
}
/*
* 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(ifsp, REQUEST);
dpkt->pkt->ciaddr.s_addr = ifsp->if_addr.s_addr;
add_pkt_opt16(dpkt, CD_MAX_DHCP_SIZE, htons(ifsp->if_max -
sizeof (struct udpiphdr)));
add_pkt_opt32(dpkt, CD_LEASE_TIME, htonl(DHCP_PERM));
add_pkt_opt(dpkt, CD_CLASS_ID, class_id, class_id_len);
add_pkt_opt(dpkt, CD_REQUEST_LIST, ifsp->if_prl, ifsp->if_prllen);
/*
* if_reqhost was set for this interface in dhcp_selecting()
* if the REQUEST_HOSTNAME option was set and a host name was
* found.
*/
if (ifsp->if_reqhost != NULL) {
add_pkt_opt(dpkt, CD_HOSTNAME, ifsp->if_reqhost,
strlen(ifsp->if_reqhost));
}
add_pkt_opt(dpkt, CD_END, NULL, 0);
/*
* if we can't send the packet, leave the event handler registered
* anyway, since we're not expecting to get any other types of
* packets in other than ACKs/NAKs anyway.
*/
return (send_pkt(ifsp, dpkt, ifsp->if_server.s_addr, NULL));
}
/* ARGSUSED */
void
dhcp_rebind(iu_tq_t *tqp, void *arg)
{
struct ifslist *ifsp = (struct ifslist *)arg;
uint32_t next;
ifsp->if_timer[DHCP_T2_TIMER] = -1;
if (check_ifs(ifsp) == 0) {
(void) release_ifs(ifsp);
return;
}
/*
* sanity check: don't send packets if we've already expired.
*/
if (monosec() > (ifsp->if_curstart_monosec + ifsp->if_lease))
return;
next = next_extend_time(ifsp->if_curstart_monosec + ifsp->if_lease);
/*
* if this is our first venture into the REBINDING state, then
* reset the server address. we know the renew timer has
* already been cancelled (or we wouldn't be here).
*/
if (ifsp->if_state == RENEWING) {
ifsp->if_state = REBINDING;
ifsp->if_server.s_addr = htonl(INADDR_BROADCAST);
}
/*
* if there isn't an async event pending, then try to rebind.
*/
if (!async_pending(ifsp))
if (async_start(ifsp, DHCP_EXTEND, B_FALSE) != 0)
/*
* try to send extend. if we don't succeed,
* async_timeout() will clean us up.
*/
(void) dhcp_extending(ifsp);
/*
* if we're within DHCP_REBIND_MIN seconds of EXPIRE, don't
* reschedule ourselves.
*/
if (next == 0) {
dhcpmsg(MSG_WARNING, "dhcp_rebind: lease on %s expires in less "
"than %i seconds!", ifsp->if_name, DHCP_REBIND_MIN);
return;
}
if (schedule_ifs_timer(ifsp, DHCP_T2_TIMER, next, dhcp_rebind) == 0)
/*
* we'll just end up in dhcp_expire(), but it sure sucks.
*/
dhcpmsg(MSG_CRIT, "dhcp_rebind: cannot reschedule another "
"rebind attempt; lease may expire for %s", ifsp->if_name);
}