linuxptp/port_signaling.c

115 lines
3.1 KiB
C

/**
* @file port_signaling.c
* @brief Implements signaling messages
* @note Copyright (C) 2018 Richard Cochran <richardcochran@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA.
*/
#include "port_private.h"
#include "unicast_client.h"
#include "unicast_service.h"
static struct PortIdentity wildcard = {
.clockIdentity = {
{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}
},
.portNumber = 0xffff,
};
struct ptp_message *port_signaling_construct(struct port *p,
struct address *address,
struct PortIdentity *tpid)
{
struct ptp_message *msg;
msg = msg_allocate();
if (!msg) {
return NULL;
}
msg->hwts.type = p->timestamping;
msg->header.tsmt = SIGNALING | p->transportSpecific;
msg->header.ver = PTP_VERSION;
msg->header.messageLength = sizeof(struct signaling_msg);
msg->header.domainNumber = clock_domain_number(p->clock);
msg->header.sourcePortIdentity = p->portIdentity;
msg->header.sequenceId = p->seqnum.signaling++;
msg->header.control = CTL_OTHER;
msg->header.logMessageInterval = 0x7F;
msg->signaling.targetPortIdentity = *tpid;
msg->header.flagField[0] |= UNICAST;
msg->address = *address;
return msg;
}
int process_signaling(struct port *p, struct ptp_message *m)
{
struct tlv_extra *extra;
int err = 0, result;
switch (p->state) {
case PS_INITIALIZING:
case PS_FAULTY:
case PS_DISABLED:
return 0;
case PS_LISTENING:
case PS_PRE_MASTER:
case PS_MASTER:
case PS_GRAND_MASTER:
case PS_PASSIVE:
case PS_UNCALIBRATED:
case PS_SLAVE:
break;
}
/* Ignore signaling messages not addressed to this port. */
if (!pid_eq(&m->signaling.targetPortIdentity, &p->portIdentity) &&
!pid_eq(&m->signaling.targetPortIdentity, &wildcard)) {
return 0;
}
TAILQ_FOREACH(extra, &m->tlv_list, list) {
switch (extra->tlv->type) {
case TLV_REQUEST_UNICAST_TRANSMISSION:
result = unicast_service_add(p, m, extra);
switch (result) {
case SERVICE_GRANTED:
err = unicast_service_grant(p, m, extra);
break;
case SERVICE_DENIED:
err = unicast_service_deny(p, m, extra);
break;
case SERVICE_DISABLED:
default:
break;
}
break;
case TLV_GRANT_UNICAST_TRANSMISSION:
unicast_client_grant(p, m, extra);
break;
case TLV_CANCEL_UNICAST_TRANSMISSION:
err = unicast_client_cancel(p, m, extra);
unicast_service_remove(p, m, extra);
break;
case TLV_ACKNOWLEDGE_CANCEL_UNICAST_TRANSMISSION:
break;
}
}
return err;
}