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/************************************************************************
* RSTP library - Rapid Spanning Tree (802.1t, 802.1w)
* Copyright (C) 2001-2003 Optical Access
* Author: Alex Rozin
*
* This file is part of RSTP library.
*
* RSTP library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation; version 2.1
*
* RSTP library 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 Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with RSTP library; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
**********************************************************************/
/* Port Transmit state machine : 17.27 */
#include "base.h"
#include "stpm.h"
#include "stp_to.h" /* for STP_OUT_get_port_mac & STP_OUT_tx_bpdu */
#define BPDU_LEN8023_OFF 12
#define STATES { \
CHOOSE(TRANSMIT_INIT), \
CHOOSE(TRANSMIT_PERIODIC), \
CHOOSE(IDLE), \
CHOOSE(TRANSMIT_CONFIG), \
CHOOSE(TRANSMIT_TCN), \
CHOOSE(TRANSMIT_RSTP) \
}
#define GET_STATE_NAME STP_transmit_get_state_name
#include "choose.h"
#define MIN_FRAME_LENGTH 64
typedef struct tx_tcn_bpdu_t {
MAC_HEADER_T mac;
ETH_HEADER_T eth;
BPDU_HEADER_T hdr;
} TCN_BPDU_T;
typedef struct tx_stp_bpdu_t {
MAC_HEADER_T mac;
ETH_HEADER_T eth;
BPDU_HEADER_T hdr;
BPDU_BODY_T body;
} CONFIG_BPDU_T;
typedef struct tx_rstp_bpdu_t {
MAC_HEADER_T mac;
ETH_HEADER_T eth;
BPDU_HEADER_T hdr;
BPDU_BODY_T body;
unsigned char ver_1_length[2];
} RSTP_BPDU_T;
static RSTP_BPDU_T bpdu_packet = {
{/* MAC_HEADER_T */
{0x01, 0x80, 0xc2, 0x00, 0x00, 0x00}, /* dst_mac */
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00} /* src_mac */
},
{ /* ETH_HEADER_T */
{0x00, 0x00}, /* len8023 */
BPDU_L_SAP, BPDU_L_SAP, LLC_UI /* dsap, ssap, llc */
},
{/* BPDU_HEADER_T */
{0x00, 0x00}, /* protocol */
BPDU_VERSION_ID, 0x00 /* version, bpdu_type */
},
{
0x00, /* flags; */
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}, /* root_id[8]; */
{0x00,0x00,0x00,0x00}, /* root_path_cost[4]; */
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}, /* bridge_id[8]; */
{0x00,0x00}, /* port_id[2]; */
{0x00,0x00}, /* message_age[2]; */
{0x00,0x00}, /* max_age[2]; */
{0x00,0x00}, /* hello_time[2]; */
{0x00,0x00}, /* forward_delay[2]; */
},
{0x00,0x00}, /* ver_1_length[2]; */
};
static size_t
build_bpdu_header (int port_index,
unsigned char bpdu_type,
unsigned short pkt_len)
{
unsigned short len8023;
STP_OUT_get_port_mac (port_index, bpdu_packet.mac.src_mac);
bpdu_packet.hdr.bpdu_type = bpdu_type;
bpdu_packet.hdr.version = (BPDU_RSTP == bpdu_type) ?
BPDU_VERSION_RAPID_ID :
BPDU_VERSION_ID;
/* NOTE: I suppose, that sizeof(unsigned short)=2 ! */
len8023 = htons ((unsigned short) (pkt_len + 3));
(void) memcpy (&bpdu_packet.eth.len8023, &len8023, 2);
if (pkt_len < MIN_FRAME_LENGTH) pkt_len = MIN_FRAME_LENGTH;
return pkt_len;
}
static int
txTcn (STATE_MACH_T* this)
{ /* 17.19.17 (page 68) & 9.3.2 (page 25) */
register size_t pkt_len;
register int port_index, vlan_id;
#ifdef STP_DBG
if (this->owner.port->skip_tx > 0) {
if (1 == this->owner.port->skip_tx)
stp_trace ("port %s stop tx skipping",
this->owner.port->port_name);
this->owner.port->skip_tx--;
return STP_Nothing_To_Do;
}
#endif
if (this->owner.port->admin_non_stp) return 1;
port_index = this->owner.port->port_index;
vlan_id = this->owner.port->owner->vlan_id;
pkt_len = build_bpdu_header (port_index,
BPDU_TOPO_CHANGE_TYPE,
sizeof (BPDU_HEADER_T));
#ifdef STP_DBG
if (this->debug)
stp_trace ("port %s txTcn", this->owner.port->port_name);
#endif
return STP_OUT_tx_bpdu (port_index, vlan_id,
(unsigned char *) &bpdu_packet,
pkt_len);
}
static void
build_config_bpdu (PORT_T* port, Bool set_topo_ack_flag)
{
bpdu_packet.body.flags = 0;
if (port->tcWhile) {
#ifdef STP_DBG
if (port->topoch->debug)
stp_trace ("tcWhile=%d =>tx TOPOLOGY_CHANGE_BIT to port %s",
(int) port->tcWhile, port->port_name);
#endif
bpdu_packet.body.flags |= TOPOLOGY_CHANGE_BIT;
}
if (set_topo_ack_flag && port->tcAck) {
bpdu_packet.body.flags |= TOPOLOGY_CHANGE_ACK_BIT;
}
STP_VECT_set_vector (&port->portPrio, &bpdu_packet.body);
STP_set_times (&port->portTimes, &bpdu_packet.body);
}
static int
txConfig (STATE_MACH_T* this)
{/* 17.19.15 (page 67) & 9.3.1 (page 23) */
register size_t pkt_len;
register PORT_T* port = NULL;
register int port_index, vlan_id;
#ifdef STP_DBG
if (this->owner.port->skip_tx > 0) {
if (1 == this->owner.port->skip_tx)
stp_trace ("port %s stop tx skipping",
this->owner.port->port_name);
this->owner.port->skip_tx--;
return STP_Nothing_To_Do;
}
#endif
port = this->owner.port;
if (port->admin_non_stp) return 1;
port_index = port->port_index;
vlan_id = port->owner->vlan_id;
pkt_len = build_bpdu_header (port->port_index,
BPDU_CONFIG_TYPE,
sizeof (BPDU_HEADER_T) + sizeof (BPDU_BODY_T));
build_config_bpdu (port, True);
#ifdef STP_DBG
if (this->debug)
stp_trace ("port %s txConfig flags=0X%lx",
port->port_name,
(unsigned long) bpdu_packet.body.flags);
#endif
return STP_OUT_tx_bpdu (port_index, vlan_id,
(unsigned char *) &bpdu_packet,
pkt_len);
}
static int
txRstp (STATE_MACH_T* this)
{/* 17.19.16 (page 68) & 9.3.3 (page 25) */
register size_t pkt_len;
register PORT_T* port = NULL;
register int port_index, vlan_id;
unsigned char role;
#ifdef STP_DBG
if (this->owner.port->skip_tx > 0) {
if (1 == this->owner.port->skip_tx)
stp_trace ("port %s stop tx skipping",
this->owner.port->port_name);
else
stp_trace ("port %s skip tx %d",
this->owner.port->port_name, this->owner.port->skip_tx);
this->owner.port->skip_tx--;
return STP_Nothing_To_Do;
}
#endif
port = this->owner.port;
if (port->admin_non_stp) return 1;
port_index = port->port_index;
vlan_id = port->owner->vlan_id;
pkt_len = build_bpdu_header (port->port_index,
BPDU_RSTP,
sizeof (BPDU_HEADER_T) + sizeof (BPDU_BODY_T) + 2);
build_config_bpdu (port, False);
switch (port->selectedRole) {
default:
case DisabledPort:
role = RSTP_PORT_ROLE_UNKN;
break;
case AlternatePort:
role = RSTP_PORT_ROLE_ALTBACK;
break;
case BackupPort:
role = RSTP_PORT_ROLE_ALTBACK;
break;
case RootPort:
role = RSTP_PORT_ROLE_ROOT;
break;
case DesignatedPort:
role = RSTP_PORT_ROLE_DESGN;
break;
}
bpdu_packet.body.flags |= (role << PORT_ROLE_OFFS);
if (port->synced) {
#if 0 /* def STP_DBG */
if (port->roletrns->debug)
stp_trace ("tx AGREEMENT_BIT to port %s", port->port_name);
#endif
bpdu_packet.body.flags |= AGREEMENT_BIT;
}
if (port->proposing) {
#if 0 /* def STP_DBG */
if (port->roletrns->debug)
stp_trace ("tx PROPOSAL_BIT to port %s", port->port_name);
#endif
bpdu_packet.body.flags |= PROPOSAL_BIT;
}
#ifdef STP_DBG
if (this->debug)
stp_trace ("port %s txRstp flags=0X%lx",
port->port_name,
(unsigned long) bpdu_packet.body.flags);
#endif
return STP_OUT_tx_bpdu (port_index, vlan_id,
(unsigned char *) &bpdu_packet,
pkt_len);
}
void
STP_transmit_enter_state (STATE_MACH_T* this)
{
register PORT_T* port = this->owner.port;
switch (this->State) {
case BEGIN:
case TRANSMIT_INIT:
port->newInfo = False;
port->helloWhen = 0;
port->txCount = 0;
break;
case TRANSMIT_PERIODIC:
port->newInfo = port->newInfo ||
((port->role == DesignatedPort) ||
((port->role == RootPort) && port->tcWhile));
port->helloWhen = port->owner->rootTimes.HelloTime;
break;
case IDLE:
break;
case TRANSMIT_CONFIG:
port->newInfo = False;
(void) txConfig (this);
port->txCount++;
port->tcAck = False;
break;
case TRANSMIT_TCN:
port->newInfo = False;
(void) txTcn (this);
port->txCount++;
break;
case TRANSMIT_RSTP:
port->newInfo = False;
(void) txRstp (this);
port->txCount++;
port->tcAck = False;
break;
};
}
Bool
STP_transmit_check_conditions (STATE_MACH_T* this)
{
register PORT_T* port = this->owner.port;
switch (this->State) {
case BEGIN:
return STP_hop_2_state (this, TRANSMIT_INIT);
case TRANSMIT_INIT:
return STP_hop_2_state (this, IDLE);
case TRANSMIT_PERIODIC:
return STP_hop_2_state (this, IDLE);
case IDLE:
if (!port->helloWhen) return STP_hop_2_state (this, TRANSMIT_PERIODIC);
if (!port->sendRSTP && port->newInfo &&
(port->txCount < TxHoldCount) &&
(port->role == DesignatedPort) &&
port->helloWhen)
return STP_hop_2_state (this, TRANSMIT_CONFIG);
if (!port->sendRSTP && port->newInfo &&
(port->txCount < TxHoldCount) &&
(port->role == RootPort) &&
port->helloWhen)
return STP_hop_2_state (this, TRANSMIT_TCN);
if (port->sendRSTP && port->newInfo &&
(port->txCount < TxHoldCount) &&
((port->role == RootPort) ||
(port->role == DesignatedPort)))
return STP_hop_2_state (this, TRANSMIT_RSTP);
break;
case TRANSMIT_CONFIG:
return STP_hop_2_state (this, IDLE);
case TRANSMIT_TCN:
return STP_hop_2_state (this, IDLE);
case TRANSMIT_RSTP:
return STP_hop_2_state (this, IDLE);
};
return False;
}
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