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);
}
void
dhcp_requesting(iu_tq_t *tqp, void *arg)
{
dhcp_smach_t *dsmp = arg;
dhcp_pkt_t *dpkt;
PKT_LIST *offer;
lease_t lease;
boolean_t isv6 = dsmp->dsm_isv6;
/*
* We assume here that if tqp is set, then this means we're being
* called back by the offer wait timer. If so, then drop our hold
* on the state machine. Otherwise, cancel the timer if it's running.
*/
if (tqp != NULL) {
dhcpmsg(MSG_VERBOSE,
"dhcp_requesting: offer wait timer on v%d %s",
isv6 ? 6 : 4, dsmp->dsm_name);
dsmp->dsm_offer_timer = -1;
if (!verify_smach(dsmp))
return;
} else {
cancel_offer_timer(dsmp);
}
/*
* select the best OFFER; all others pitched.
*/
offer = select_best(dsmp);
if (offer == NULL) {
dhcpmsg(MSG_VERBOSE,
"no OFFERs/Advertisements on %s, waiting...",
dsmp->dsm_name);
/*
* no acceptable OFFERs have come in. reschedule
* ourself for callback.
*/
if ((dsmp->dsm_offer_timer = iu_schedule_timer(tq,
dsmp->dsm_offer_wait, dhcp_requesting, dsmp)) == -1) {
/*
* ugh. the best we can do at this point is
* revert back to INIT and wait for a user to
* restart us.
*/
dhcpmsg(MSG_WARNING, "dhcp_requesting: cannot "
"reschedule callback, reverting to INIT state on "
"%s", dsmp->dsm_name);
stop_pkt_retransmission(dsmp);
(void) set_smach_state(dsmp, INIT);
dsmp->dsm_dflags |= DHCP_IF_FAILED;
ipc_action_finish(dsmp, DHCP_IPC_E_MEMORY);
} else {
hold_smach(dsmp);
}
return;
}
/*
* With IPv4, the DHCPREQUEST packet we're about to transmit implicitly
* declines all other offers we've received. We can no longer use any
* cached offers, so we must discard them now. With DHCPv6, though,
* we're permitted to hang onto the advertisements (offers) and try
* them if the preferred one doesn't pan out.
*/
if (!isv6)
free_pkt_list(&dsmp->dsm_recv_pkt_list);
/* stop collecting packets. */
stop_pkt_retransmission(dsmp);
/*
* For IPv4, check to see whether we got an OFFER or a BOOTP packet.
* If we got a BOOTP packet, go to the BOUND state now.
*/
if (!isv6 && offer->opts[CD_DHCP_TYPE] == NULL) {
free_pkt_list(&dsmp->dsm_recv_pkt_list);
if (!set_smach_state(dsmp, REQUESTING)) {
dhcp_restart(dsmp);
return;
}
if (!dhcp_bound(dsmp, offer)) {
dhcpmsg(MSG_WARNING, "dhcp_requesting: dhcp_bound "
"failed for %s", dsmp->dsm_name);
dhcp_restart(dsmp);
return;
}
return;
}
if (isv6) {
const char *estr, *msg;
const dhcpv6_option_t *d6o;
uint_t olen, msglen;
/* If there's a Status Code option, print the message */
d6o = dhcpv6_pkt_option(offer, NULL, DHCPV6_OPT_STATUS_CODE,
&olen);
(void) dhcpv6_status_code(d6o, olen, &estr, &msg, &msglen);
print_server_msg(dsmp, msg, msglen);
/* Copy in the Server ID (guaranteed to be present now) */
if (!save_server_id(dsmp, offer))
goto failure;
/*
* Determine how to send this message. If the Advertisement
* (offer) has the unicast option, then use the address
* specified in the option. Otherwise, send via multicast.
*/
server_unicast_option(dsmp, offer);
send_v6_request(dsmp);
} else {
/* if we got a message from the server, display it. */
if (offer->opts[CD_MESSAGE] != NULL) {
print_server_msg(dsmp,
(char *)offer->opts[CD_MESSAGE]->value,
offer->opts[CD_MESSAGE]->len);
}
/*
* assemble a DHCPREQUEST, with the ciaddr field set to 0,
* since we got here from the INIT state.
*/
dpkt = init_pkt(dsmp, REQUEST);
/*
* Grab the lease out of the OFFER; we know it's valid because
* select_best() already checked. The max dhcp message size
* option is set to the interface max, minus the size of the
* udp and ip headers.
*/
(void) memcpy(&lease, offer->opts[CD_LEASE_TIME]->value,
sizeof (lease_t));
(void) add_pkt_opt32(dpkt, CD_LEASE_TIME, lease);
(void) add_pkt_opt16(dpkt, CD_MAX_DHCP_SIZE,
htons(dsmp->dsm_lif->lif_max - sizeof (struct udpiphdr)));
(void) add_pkt_opt32(dpkt, CD_REQUESTED_IP_ADDR,
offer->pkt->yiaddr.s_addr);
(void) add_pkt_opt(dpkt, CD_SERVER_ID,
offer->opts[CD_SERVER_ID]->value,
offer->opts[CD_SERVER_ID]->len);
if (class_id_len != 0) {
(void) add_pkt_opt(dpkt, CD_CLASS_ID, class_id,
class_id_len);
}
(void) add_pkt_prl(dpkt, dsmp);
/*
* dsm_reqhost was set for this state machine in
* dhcp_selecting() if the DF_REQUEST_HOSTNAME option set and a
* host name was found
*/
if (dsmp->dsm_reqhost != NULL) {
(void) add_pkt_opt(dpkt, CD_HOSTNAME, dsmp->dsm_reqhost,
strlen(dsmp->dsm_reqhost));
}
(void) add_pkt_opt(dpkt, CD_END, NULL, 0);
/*
* send out the REQUEST, trying retransmissions. either a NAK
* or too many REQUEST attempts will revert us to SELECTING.
*/
if (!set_smach_state(dsmp, REQUESTING)) {
dhcpmsg(MSG_ERROR, "dhcp_requesting: cannot switch to "
"REQUESTING state; reverting to INIT on %s",
dsmp->dsm_name);
goto failure;
}
(void) send_pkt(dsmp, dpkt, htonl(INADDR_BROADCAST),
stop_requesting);
}
/* all done with the offer */
free_pkt_entry(offer);
return;
failure:
dsmp->dsm_dflags |= DHCP_IF_FAILED;
(void) set_smach_state(dsmp, INIT);
ipc_action_finish(dsmp, DHCP_IPC_E_MEMORY);
free_pkt_list(&dsmp->dsm_recv_pkt_list);
}
static void
accept_v4_acknak(dhcp_smach_t *dsmp, PKT_LIST *plp)
{
/* Account for received and processed messages */
dsmp->dsm_received++;
if (*plp->opts[CD_DHCP_TYPE]->value == ACK) {
if (dsmp->dsm_state != INFORM_SENT &&
dsmp->dsm_state != INFORMATION &&
(plp->opts[CD_LEASE_TIME] == NULL ||
plp->opts[CD_LEASE_TIME]->len != sizeof (lease_t))) {
dhcpmsg(MSG_WARNING, "accept_v4_acknak: ACK packet on "
"%s missing mandatory lease option, ignored",
dsmp->dsm_name);
dsmp->dsm_bad_offers++;
free_pkt_entry(plp);
return;
}
if ((dsmp->dsm_state == RENEWING ||
dsmp->dsm_state == REBINDING) &&
dsmp->dsm_leases->dl_lifs->lif_addr !=
plp->pkt->yiaddr.s_addr) {
dhcpmsg(MSG_WARNING, "accept_v4_acknak: renewal ACK "
"packet has a different IP address (%s), ignored",
inet_ntoa(plp->pkt->yiaddr));
dsmp->dsm_bad_offers++;
free_pkt_entry(plp);
return;
}
}
/*
* looks good; cancel the retransmission timer and unregister
* the acknak handler. ACK to BOUND, NAK back to SELECTING.
*/
stop_pkt_retransmission(dsmp);
if (*plp->opts[CD_DHCP_TYPE]->value == NAK) {
char saddr[18];
saddr[0] = '\0';
if (plp->opts[CD_SERVER_ID] != NULL &&
plp->opts[CD_SERVER_ID]->len == sizeof (struct in_addr)) {
struct in_addr t_server;
bcopy(plp->opts[CD_SERVER_ID]->value, &t_server,
plp->opts[CD_SERVER_ID]->len);
(void) strlcpy(saddr, inet_ntoa(t_server),
sizeof (saddr));
}
dhcpmsg(MSG_WARNING, "accept_v4_acknak: NAK on interface %s "
"from %s %s",
dsmp->dsm_name,
inet_ntoa(plp->pktfrom.v4.sin_addr), saddr);
dsmp->dsm_bad_offers++;
free_pkt_entry(plp);
dhcp_restart(dsmp);
/*
* remove any bogus cached configuration we might have
* around (right now would only happen if we got here
* from INIT_REBOOT).
*/
(void) remove_hostconf(dsmp->dsm_name, dsmp->dsm_isv6);
return;
}
if (plp->opts[CD_SERVER_ID] == NULL ||
plp->opts[CD_SERVER_ID]->len != sizeof (ipaddr_t)) {
dhcpmsg(MSG_ERROR, "accept_v4_acknak: ACK with no valid "
"server id on %s", dsmp->dsm_name);
dsmp->dsm_bad_offers++;
free_pkt_entry(plp);
dhcp_restart(dsmp);
return;
}
if (plp->opts[CD_MESSAGE] != NULL) {
print_server_msg(dsmp, (char *)plp->opts[CD_MESSAGE]->value,
plp->opts[CD_MESSAGE]->len);
}
dhcpmsg(MSG_VERBOSE, "accept_v4_acknak: ACK on %s", dsmp->dsm_name);
if (!dhcp_bound(dsmp, plp)) {
dhcpmsg(MSG_WARNING, "accept_v4_acknak: dhcp_bound failed "
"for %s", dsmp->dsm_name);
dhcp_restart(dsmp);
}
}
boolean_t
dhcp_extending(dhcp_smach_t *dsmp)
{
dhcp_pkt_t *dpkt;
stop_pkt_retransmission(dsmp);
/*
* We change state here because this function is also called when
* adopting a lease and on demand by the user.
*/
if (dsmp->dsm_state == BOUND) {
dsmp->dsm_neg_hrtime = gethrtime();
dsmp->dsm_bad_offers = 0;
dsmp->dsm_sent = 0;
dsmp->dsm_received = 0;
/* Bound->renew can't fail */
(void) set_smach_state(dsmp, RENEWING);
}
dhcpmsg(MSG_DEBUG, "dhcp_extending: sending request on %s",
dsmp->dsm_name);
if (dsmp->dsm_isv6) {
dhcp_lease_t *dlp;
dhcp_lif_t *lif;
uint_t nlifs;
uint_t irt, mrt;
/*
* Start constructing the Renew/Rebind message. Only Renew has
* a server ID, as we still think our server might be
* reachable.
*/
if (dsmp->dsm_state == RENEWING) {
dpkt = init_pkt(dsmp, DHCPV6_MSG_RENEW);
(void) add_pkt_opt(dpkt, DHCPV6_OPT_SERVERID,
dsmp->dsm_serverid, dsmp->dsm_serveridlen);
irt = DHCPV6_REN_TIMEOUT;
mrt = DHCPV6_REN_MAX_RT;
} else {
dpkt = init_pkt(dsmp, DHCPV6_MSG_REBIND);
irt = DHCPV6_REB_TIMEOUT;
mrt = DHCPV6_REB_MAX_RT;
}
/*
* Loop over the leases, and add an IA_NA for each and an
* IAADDR for each address.
*/
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);
}
}
/* Add required Option Request option */
(void) add_pkt_prl(dpkt, dsmp);
return (send_pkt_v6(dsmp, dpkt, dsmp->dsm_server,
stop_extending, irt, mrt));
} else {
dhcp_lif_t *lif = dsmp->dsm_lif;
ipaddr_t server;
/* assemble the DHCPREQUEST message. */
dpkt = init_pkt(dsmp, REQUEST);
dpkt->pkt->ciaddr.s_addr = lif->lif_addr;
/*
* The max dhcp message size option is set to the interface
* max, minus the size of the udp and ip headers.
*/
(void) add_pkt_opt16(dpkt, CD_MAX_DHCP_SIZE,
htons(lif->lif_max - sizeof (struct udpiphdr)));
(void) add_pkt_opt32(dpkt, CD_LEASE_TIME, htonl(DHCP_PERM));
if (class_id_len != 0) {
(void) add_pkt_opt(dpkt, CD_CLASS_ID, class_id,
class_id_len);
}
(void) add_pkt_prl(dpkt, dsmp);
/*
* dsm_reqhost was set for this state machine in
* dhcp_selecting() if the REQUEST_HOSTNAME option was set and
* a host name was found.
*/
if (!dhcp_add_fqdn_opt(dpkt, dsmp) &&
dsmp->dsm_reqhost != NULL) {
(void) add_pkt_opt(dpkt, CD_HOSTNAME, dsmp->dsm_reqhost,
strlen(dsmp->dsm_reqhost));
}
(void) add_pkt_opt(dpkt, CD_END, NULL, 0);
IN6_V4MAPPED_TO_IPADDR(&dsmp->dsm_server, server);
return (send_pkt(dsmp, dpkt, server, stop_extending));
}
}
