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mstp.c
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/*
* mstp.c State machines from IEEE 802.1Q-2005
*
* 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.
*
* Authors: Vitalii Demianets <[email protected]>
*/
/* NOTE: The standard messes up Hello_Time timer management.
* The portTimes and msgTimes structures have it, while
* designatedTimes, rootTimes and BridgeTimes do not!
* And there are places, where standard says:
* "portTimes = designatedTimes" (13.32)
* "rootTimes = portTimes" (13.26.23)
* ---- Bad IEEE! ----
* For now I decide: All structures will hold Hello_Time,
* because in 802.1D they do.
* Besides, it is necessary for compatibility with old STP implementations.
*/
/* 802.1Q-2005 does not define but widely use variable name newInfoXst.
* From the 802.1s I can guess that it means:
* - "newInfo" when tree is CIST;
* - "newInfoMsti" when tree is not CIST (is MSTI).
* But that is only a guess and I could be wrong here ;)
*/
/* Important coding convention:
* All functions that have dry_run argument must follow the
* return value convention:
* They should return true if state change detected during dry run.
* Otherwise (!dry_run || !state_change) they return false.
*/
#include <string.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <linux/if_bridge.h>
#include <asm/byteorder.h>
#include "mstp.h"
#include "log.h"
#include "driver.h"
static void PTSM_tick(port_t *prt);
static bool TCSM_run(per_tree_port_t *ptp, bool dry_run);
static void BDSM_begin(port_t *prt);
static void br_state_machines_begin(bridge_t *br);
static void prt_state_machines_begin(port_t *prt);
static void tree_state_machines_begin(tree_t *tree);
static void br_state_machines_run(bridge_t *br);
static void updtbrAssuRcvdInfoWhile(port_t *prt);
#define FOREACH_PORT_IN_BRIDGE(port, bridge) \
list_for_each_entry((port), &(bridge)->ports, br_list)
#define FOREACH_TREE_IN_BRIDGE(tree, bridge) \
list_for_each_entry((tree), &(bridge)->trees, bridge_list)
#define FOREACH_PTP_IN_TREE(ptp, tree) \
list_for_each_entry((ptp), &(tree)->ports, tree_list)
#define FOREACH_PTP_IN_PORT(ptp, port) \
list_for_each_entry((ptp), &(port)->trees, port_list)
/* 17.20.11 of 802.1D */
#define rstpVersion(br) ((br)->ForceProtocolVersion >= protoRSTP)
/* Bridge assurance is operational only when NetworkPort type is configured
* and the operation status is pointToPoint and version is RSTP/MSTP
*/
#define assurancePort(prt) ((prt)->NetworkPort && (prt)->operPointToPointMAC \
&& (prt)->sendRSTP)
/*
* Recalculate configuration digest. (13.7)
*/
static void RecalcConfigDigest(bridge_t *br)
{
__be16 vid2mstid[MAX_VID + 2];
unsigned char mstp_key[] = HMAC_KEY;
int vid;
vid2mstid[0] = vid2mstid[MAX_VID + 1] = 0;
for(vid = 1; vid <= MAX_VID; ++vid)
vid2mstid[vid] = br->fid2mstid[br->vid2fid[vid]];
hmac_md5((void *)vid2mstid, sizeof(vid2mstid), mstp_key, sizeof(mstp_key),
(caddr_t)br->MstConfigId.s.configuration_digest);
}
/*
* 13.37.1 - Table 13-3
*/
static __u32 compute_pcost(int speed)
{
/* speed is in MB/s*/
if(speed > 0)
return (speed < 20000000) ? 20000000 / speed : 1;
else
return MAX_PATH_COST;
}
static void bridge_default_internal_vars(bridge_t *br)
{
br->uptime = 0;
}
static void tree_default_internal_vars(tree_t *tree)
{
/* 12.8.1.1.3.(b,c,d) */
tree->time_since_topology_change = 0;
tree->topology_change_count = 0;
tree->topology_change = false; /* since all tcWhile are initialized to 0 */
strncpy(tree->topology_change_port, "None", IFNAMSIZ);
strncpy(tree->last_topology_change_port, "None", IFNAMSIZ);
/* The following are initialized in BEGIN state:
* - rootPortId, rootPriority, rootTimes: in Port Role Selection SM
*/
}
static void port_default_internal_vars(port_t *prt)
{
prt->infoInternal = false;
prt->rcvdInternal = false;
prt->rcvdTcAck = false;
prt->rcvdTcn = false;
assign(prt->rapidAgeingWhile, 0u);
assign(prt->brAssuRcvdInfoWhile, 0u);
prt->BaInconsistent = false;
prt->num_rx_bpdu = 0;
prt->num_rx_tcn = 0;
prt->num_tx_bpdu = 0;
prt->num_tx_tcn = 0;
prt->num_trans_fwd = 0;
prt->num_trans_blk = 0;
/* The following are initialized in BEGIN state:
* - mdelayWhile. mcheck, sendRSTP: in Port Protocol Migration SM
* - helloWhen, newInfo, newInfoMsti, txCount: in Port Transmit SM
* - edgeDelayWhile, rcvdBpdu, rcvdRSTP, rcvdSTP : in Port Receive SM
* - operEdge: in Bridge Detection SM
* - tcAck: in Topology Change SM
*/
}
static void ptp_default_internal_vars(per_tree_port_t *ptp)
{
ptp->rcvdTc = false;
ptp->tcProp = false;
ptp->updtInfo = false;
ptp->master = false; /* 13.24.5 */
ptp->disputed = false;
assign(ptp->rcvdInfo, (port_info_t)0);
ptp->mastered = false;
memset(&ptp->msgPriority, 0, sizeof(ptp->msgPriority));
memset(&ptp->msgTimes, 0, sizeof(ptp->msgTimes));
/* The following are initialized in BEGIN state:
* - rcvdMsg: in Port Receive SM
* - fdWhile, rrWhile, rbWhile, role, learn, forward,
* sync, synced, reRoot: in Port Role Transitions SM
* - tcWhile, fdbFlush: Topology Change SM
* - rcvdInfoWhile, proposed, proposing, agree, agreed,
* infoIs, reselect, selected: Port Information SM
* - forwarding, learning: Port State Transition SM
* - selectedRole, designatedPriority, designatedTimes: Port Role Selection SM
*/
}
static tree_t * create_tree(bridge_t *br, __u8 *macaddr, __be16 MSTID)
{
/* Initialize all fields except anchor */
tree_t *tree = calloc(1, sizeof(*tree));
if(!tree)
{
ERROR_BRNAME(br, "Out of memory");
return NULL;
}
tree->bridge = br;
tree->MSTID = MSTID;
INIT_LIST_HEAD(&tree->ports);
memcpy(tree->BridgeIdentifier.s.mac_address, macaddr, ETH_ALEN);
/* 0x8000 = default bridge priority (17.14 of 802.1D) */
tree->BridgeIdentifier.s.priority = __constant_cpu_to_be16(0x8000) | MSTID;
assign(tree->BridgePriority.RootID, tree->BridgeIdentifier);
assign(tree->BridgePriority.RRootID, tree->BridgeIdentifier);
assign(tree->BridgePriority.DesignatedBridgeID, tree->BridgeIdentifier);
/* 13.23.4 */
assign(tree->BridgeTimes.remainingHops, br->MaxHops);
assign(tree->BridgeTimes.Forward_Delay, br->Forward_Delay);
assign(tree->BridgeTimes.Max_Age, br->Max_Age);
assign(tree->BridgeTimes.Message_Age, (__u8)0);
assign(tree->BridgeTimes.Hello_Time, br->Hello_Time);
tree_default_internal_vars(tree);
return tree;
}
static per_tree_port_t * create_ptp(tree_t *tree, port_t *prt)
{
/* Initialize all fields except anchors */
per_tree_port_t *ptp = calloc(1, sizeof(*ptp));
if(!ptp)
{
ERROR_PRTNAME(prt->bridge, prt, "Out of memory");
return NULL;
}
ptp->port = prt;
ptp->tree = tree;
ptp->MSTID = tree->MSTID;
ptp->state = BR_STATE_DISABLED;
/* 0x80 = default port priority (17.14 of 802.1D) */
ptp->portId = __constant_cpu_to_be16(0x8000) | prt->port_number;
assign(ptp->AdminInternalPortPathCost, 0u);
assign(ptp->InternalPortPathCost, compute_pcost(GET_PORT_SPEED(prt)));
/* 802.1Q leaves portPriority and portTimes uninitialized */
assign(ptp->portPriority, tree->BridgePriority);
assign(ptp->portTimes, tree->BridgeTimes);
ptp->calledFromFlushRoutine = false;
ptp_default_internal_vars(ptp);
return ptp;
}
/* External events */
bool MSTP_IN_bridge_create(bridge_t *br, __u8 *macaddr)
{
tree_t *cist;
if (!driver_create_bridge(br, macaddr))
return false;
/* Initialize all fields except sysdeps and anchor */
INIT_LIST_HEAD(&br->ports);
INIT_LIST_HEAD(&br->trees);
br->bridgeEnabled = false;
memset(br->vid2fid, 0, sizeof(br->vid2fid));
memset(br->fid2mstid, 0, sizeof(br->fid2mstid));
assign(br->MstConfigId.s.selector, (__u8)0);
sprintf((char *)br->MstConfigId.s.configuration_name,
"%02hhX%02hhX%02hhX%02hhX%02hhX%02hhX",
macaddr[0], macaddr[1], macaddr[2],
macaddr[3], macaddr[4], macaddr[5]);
assign(br->MstConfigId.s.revision_level, __constant_cpu_to_be16(0));
RecalcConfigDigest(br); /* set br->MstConfigId.s.configuration_digest */
br->ForceProtocolVersion = protoMSTP;
assign(br->MaxHops, (__u8)20); /* 13.37.3 */
assign(br->Forward_Delay, (__u8)15); /* 17.14 of 802.1D */
assign(br->Max_Age, (__u8)20); /* 17.14 of 802.1D */
assign(br->Transmit_Hold_Count, 6u); /* 17.14 of 802.1D */
assign(br->Migrate_Time, 3u); /* 17.14 of 802.1D */
assign(br->Ageing_Time, 300u);/* 8.8.3 Table 8-3 */
assign(br->Hello_Time, (__u8)2); /* 17.14 of 802.1D */
bridge_default_internal_vars(br);
/* Create CIST */
if(!(cist = create_tree(br, macaddr, 0)))
return false;
list_add_tail(&cist->bridge_list, &br->trees);
return true;
}
bool MSTP_IN_port_create_and_add_tail(port_t *prt, __u16 portno)
{
tree_t *tree;
per_tree_port_t *ptp, *nxt;
bridge_t *br = prt->bridge;
if (!driver_create_port(prt, portno))
return false;
/* Initialize all fields except sysdeps and bridge */
INIT_LIST_HEAD(&prt->trees);
prt->port_number = __cpu_to_be16(portno);
assign(prt->AdminExternalPortPathCost, 0u);
/* Default for operP2P is false because by default AdminP2P
* says to auto-detect p2p state, and it is derived from duplex
* and initially port is in down state and in this down state
* duplex is set to false (half) */
prt->AdminP2P = p2pAuto;
prt->operPointToPointMAC = false;
prt->portEnabled = false;
prt->restrictedRole = false; /* 13.25.14 */
prt->restrictedTcn = false; /* 13.25.15 */
assign(prt->ExternalPortPathCost, MAX_PATH_COST); /* 13.37.1 */
prt->AdminEdgePort = false; /* 13.25 */
prt->AutoEdge = true; /* 13.25 */
prt->BpduGuardPort = false;
prt->BpduGuardError = false;
prt->NetworkPort = false;
prt->dontTxmtBpdu = false;
prt->deleted = false;
port_default_internal_vars(prt);
/* Create PerTreePort structures for all existing trees */
FOREACH_TREE_IN_BRIDGE(tree, br)
{
if(!(ptp = create_ptp(tree, prt)))
{
/* Remove and free all previously created entries in port's list */
list_for_each_entry_safe(ptp, nxt, &prt->trees, port_list)
{
list_del(&ptp->port_list);
list_del(&ptp->tree_list);
free(ptp);
}
return false;
}
list_add_tail(&ptp->port_list, &prt->trees);
list_add_tail(&ptp->tree_list, &tree->ports);
}
/* Add new port to the tail of the list in the bridge */
/* NOTE: if one wants add port NOT to the tail of the list of ports,
* one should revise above loop (FOREACH_TREE_IN_BRIDGE)
* because it heavily depends on the fact that port is added to the tail.
*/
list_add_tail(&prt->br_list, &br->ports);
prt_state_machines_begin(prt);
return true;
}
void MSTP_IN_delete_port(port_t *prt)
{
per_tree_port_t *ptp, *nxt;
bridge_t *br = prt->bridge;
driver_delete_port(prt);
prt->deleted = true;
if(prt->portEnabled)
{
prt->portEnabled = false;
br_state_machines_run(br);
}
list_for_each_entry_safe(ptp, nxt, &prt->trees, port_list)
{
list_del(&ptp->port_list);
list_del(&ptp->tree_list);
free(ptp);
}
list_del(&prt->br_list);
br_state_machines_run(br);
}
void MSTP_IN_delete_bridge(bridge_t *br)
{
tree_t *tree, *nxt_tree;
port_t *prt, *nxt_prt;
driver_delete_bridge(br);
br->bridgeEnabled = false;
/* We SHOULD first delete all ports and only THEN delete all tree_t
* structures as the tree_t structure contains the head for the per-port
* list of tree data (tree_t.ports).
* If this list_head will be deleted before all the per_tree_ports
* bad things will happen ;)
*/
list_for_each_entry_safe(prt, nxt_prt, &br->ports, br_list)
{
MSTP_IN_delete_port(prt);
free(prt);
}
list_for_each_entry_safe(tree, nxt_tree, &br->trees, bridge_list)
{
list_del(&tree->bridge_list);
free(tree);
}
}
void MSTP_IN_set_bridge_address(bridge_t *br, __u8 *macaddr)
{
tree_t *tree;
bool changed = false;
FOREACH_TREE_IN_BRIDGE(tree, br)
{
if(0 == memcmp(tree->BridgeIdentifier.s.mac_address, macaddr, ETH_ALEN))
continue;
changed = true;
memcpy(tree->BridgeIdentifier.s.mac_address, macaddr, ETH_ALEN);
tree->BridgePriority.RootID = tree->BridgePriority.RRootID =
tree->BridgePriority.DesignatedBridgeID = tree->BridgeIdentifier;
}
if(changed)
br_state_machines_begin(br);
}
void MSTP_IN_set_bridge_enable(bridge_t *br, bool up)
{
port_t *prt;
per_tree_port_t *ptp;
tree_t *tree;
if(br->bridgeEnabled == up)
return;
br->bridgeEnabled = up;
/* Reset all internal states and variables,
* except those which are user-configurable */
bridge_default_internal_vars(br);
FOREACH_TREE_IN_BRIDGE(tree, br)
{
tree_default_internal_vars(tree);
}
FOREACH_PORT_IN_BRIDGE(prt, br)
{
/* NOTE: Don't check prt->deleted here, as it is imposible condition */
/* NOTE: In the port_default_internal_vars() rapidAgeingWhile will be
* reset, so we should stop rapid ageing procedure here.
*/
if(prt->rapidAgeingWhile)
{
MSTP_OUT_set_ageing_time(prt, br->Ageing_Time);
}
port_default_internal_vars(prt);
FOREACH_PTP_IN_PORT(ptp, prt)
{
if(BR_STATE_DISABLED != ptp->state)
{
MSTP_OUT_set_state(ptp, BR_STATE_DISABLED);
}
ptp_default_internal_vars(ptp);
}
}
br_state_machines_begin(br);
}
void MSTP_IN_set_port_enable(port_t *prt, bool up, int speed, int duplex)
{
__u32 computed_pcost, new_ExternalPathCost, new_InternalPathCost;
per_tree_port_t *ptp;
bool new_p2p;
bool changed = false;
if(up)
{
computed_pcost = compute_pcost(speed);
new_ExternalPathCost = (0 == prt->AdminExternalPortPathCost) ?
computed_pcost
: prt->AdminExternalPortPathCost;
if(prt->ExternalPortPathCost != new_ExternalPathCost)
{
assign(prt->ExternalPortPathCost, new_ExternalPathCost);
changed = true;
}
FOREACH_PTP_IN_PORT(ptp, prt)
{
new_InternalPathCost = (0 == ptp->AdminInternalPortPathCost) ?
computed_pcost
: ptp->AdminInternalPortPathCost;
if(ptp->InternalPortPathCost != new_InternalPathCost)
{
assign(ptp->InternalPortPathCost, new_InternalPathCost);
changed = true;
}
}
switch(prt->AdminP2P)
{
case p2pForceTrue:
new_p2p = true;
break;
case p2pForceFalse:
new_p2p = false;
break;
case p2pAuto:
default:
new_p2p = !!duplex;
break;
}
if(prt->operPointToPointMAC != new_p2p)
{
prt->operPointToPointMAC = new_p2p;
changed = true;
}
if(!prt->portEnabled)
{
prt->portEnabled = true;
prt->BpduGuardError = false;
prt->BaInconsistent = false;
prt->num_rx_bpdu = 0;
prt->num_rx_tcn = 0;
prt->num_tx_bpdu = 0;
prt->num_tx_tcn = 0;
changed = true;
/* When port is enabled, initialize bridge assurance timer,
* so that enough time is given before port is put in
* inconsistent state.
*/
updtbrAssuRcvdInfoWhile(prt);
}
}
else
{
if(prt->portEnabled)
{
prt->portEnabled = false;
changed = true;
}
}
if(changed)
br_state_machines_run(prt->bridge);
}
void MSTP_IN_one_second(bridge_t *br)
{
port_t *prt;
tree_t *tree;
++(br->uptime);
if(!br->bridgeEnabled)
return;
FOREACH_TREE_IN_BRIDGE(tree, br)
if(!(tree->topology_change))
++(tree->time_since_topology_change);
FOREACH_PORT_IN_BRIDGE(prt, br)
{
PTSM_tick(prt);
/* support for rapid ageing */
if(prt->rapidAgeingWhile)
{
if((--(prt->rapidAgeingWhile)) == 0)
{
if(!prt->deleted)
MSTP_OUT_set_ageing_time(prt, br->Ageing_Time);
}
}
}
br_state_machines_run(br);
}
void MSTP_IN_all_fids_flushed(per_tree_port_t *ptp)
{
bridge_t *br = ptp->port->bridge;
ptp->fdbFlush = false;
if(!br->bridgeEnabled)
return;
if(!ptp->calledFromFlushRoutine)
{
TCSM_run(ptp, false /* actual run */);
br_state_machines_run(br);
}
}
/* NOTE: bpdu pointer is unaligned, but it works because
* bpdu_t is packed. Don't try to cast bpdu to non-packed type ;)
*/
void MSTP_IN_rx_bpdu(port_t *prt, bpdu_t *bpdu, int size)
{
int mstis_size;
bridge_t *br = prt->bridge;
++(prt->num_rx_bpdu);
if(prt->BpduGuardPort)
{
prt->BpduGuardError = true;
ERROR_PRTNAME(br, prt,
"Received BPDU on BPDU Guarded Port - Port Down");
MSTP_OUT_shutdown_port(prt);
return;
}
if(!br->bridgeEnabled)
{
INFO_PRTNAME(br, prt, "Received BPDU while bridge is disabled");
return;
}
if(prt->rcvdBpdu)
{
ERROR_PRTNAME(br, prt, "Port hasn't processed previous BPDU");
return;
}
/* 14.4 Validation */
if((TCN_BPDU_SIZE > size) || (0 != bpdu->protocolIdentifier))
{
bpdu_validation_failed:
INFO_PRTNAME(br, prt, "BPDU validation failed");
return;
}
switch(bpdu->bpduType)
{
case bpduTypeTCN:
/* 14.4.b) */
/* Valid TCN BPDU */
bpdu->protocolVersion = protoSTP;
LOG_PRTNAME(br, prt, "received TCN BPDU");
break;
case bpduTypeConfig:
/* 14.4.a) */
if(CONFIG_BPDU_SIZE > size)
goto bpdu_validation_failed;
/* Valid Config BPDU */
bpdu->protocolVersion = protoSTP;
LOG_PRTNAME(br, prt, "received Config BPDU%s",
(bpdu->flags & (1 << offsetTc)) ? ", tcFlag" : ""
);
break;
case bpduTypeRST:
if(protoRSTP == bpdu->protocolVersion)
{ /* 14.4.c) */
if(RST_BPDU_SIZE > size)
goto bpdu_validation_failed;
/* Valid RST BPDU */
/* bpdu->protocolVersion = protoRSTP; */
LOG_PRTNAME(br, prt, "received RST BPDU%s",
(bpdu->flags & (1 << offsetTc)) ? ", tcFlag" : ""
);
break;
}
if(protoMSTP > bpdu->protocolVersion)
goto bpdu_validation_failed;
/* Yes, 802.1Q-2005 says here to check if it contains
* "35 or more octets", not 36! (see 14.4.d).1) )
* That's why I check size against CONFIG_BPDU_SIZE
* and not RST_BPDU_SIZE.
*/
if(CONFIG_BPDU_SIZE > size)
goto bpdu_validation_failed;
mstis_size = __be16_to_cpu(bpdu->version3_len)
- MST_BPDU_VER3LEN_WO_MSTI_MSGS;
if((MST_BPDU_SIZE_WO_MSTI_MSGS > size) || (0 != bpdu->version1_len)
|| (0 > mstis_size)
|| ((MAX_STANDARD_MSTIS * sizeof(msti_configuration_message_t))
< mstis_size)
|| (0 != (mstis_size % sizeof(msti_configuration_message_t)))
)
{ /* 14.4.d) */
/* Valid RST BPDU */
bpdu->protocolVersion = protoRSTP;
LOG_PRTNAME(br, prt, "received RST BPDU");
break;
}
/* 14.4.e) */
/* Valid MST BPDU */
bpdu->protocolVersion = protoMSTP;
prt->rcvdBpduNumOfMstis = mstis_size
/ sizeof(msti_configuration_message_t);
LOG_PRTNAME(br, prt, "received MST BPDU%s with %d MSTIs",
(bpdu->flags & (1 << offsetTc)) ? ", tcFlag" : "",
prt->rcvdBpduNumOfMstis
);
break;
default:
goto bpdu_validation_failed;
}
if((protoSTP == bpdu->protocolVersion) && (bpduTypeTCN == bpdu->bpduType))
{
++(prt->num_rx_tcn);
}
else
{
if(bpdu->flags & (1 << offsetTc))
++(prt->num_rx_tcn);
}
assign(prt->rcvdBpduData, *bpdu);
prt->rcvdBpdu = true;
/* Reset bridge assurance on receipt of valid BPDU */
if(prt->BaInconsistent)
{
prt->BaInconsistent = false;
INFO_PRTNAME(br, prt, "Clear Bridge assurance inconsistency");
}
updtbrAssuRcvdInfoWhile(prt);
br_state_machines_run(br);
}
/* 12.8.1.1 Read CIST Bridge Protocol Parameters */
void MSTP_IN_get_cist_bridge_status(bridge_t *br, CIST_BridgeStatus *status)
{
tree_t *cist = GET_CIST_TREE(br);
assign(status->bridge_id, cist->BridgeIdentifier);
assign(status->time_since_topology_change,
cist->time_since_topology_change);
assign(status->topology_change_count, cist->topology_change_count);
status->topology_change = cist->topology_change;
strncpy(status->topology_change_port, cist->topology_change_port,
IFNAMSIZ);
strncpy(status->last_topology_change_port, cist->last_topology_change_port,
IFNAMSIZ);
assign(status->designated_root, cist->rootPriority.RootID);
assign(status->root_path_cost,
__be32_to_cpu(cist->rootPriority.ExtRootPathCost));
assign(status->regional_root, cist->rootPriority.RRootID);
assign(status->internal_path_cost,
__be32_to_cpu(cist->rootPriority.IntRootPathCost));
assign(status->root_port_id, cist->rootPortId);
assign(status->root_max_age, cist->rootTimes.Max_Age);
assign(status->root_forward_delay, cist->rootTimes.Forward_Delay);
assign(status->bridge_max_age, br->Max_Age);
assign(status->bridge_forward_delay, br->Forward_Delay);
assign(status->max_hops, br->MaxHops);
assign(status->tx_hold_count, br->Transmit_Hold_Count);
status->protocol_version = br->ForceProtocolVersion;
status->enabled = br->bridgeEnabled;
assign(status->bridge_hello_time, br->Hello_Time);
assign(status->Ageing_Time, br->Ageing_Time);
}
/* 12.8.1.2 Read MSTI Bridge Protocol Parameters */
void MSTP_IN_get_msti_bridge_status(tree_t *tree, MSTI_BridgeStatus *status)
{
assign(status->bridge_id, tree->BridgeIdentifier);
assign(status->time_since_topology_change,
tree->time_since_topology_change);
assign(status->topology_change_count, tree->topology_change_count);
status->topology_change = tree->topology_change;
strncpy(status->topology_change_port, tree->topology_change_port,
IFNAMSIZ);
strncpy(status->last_topology_change_port, tree->last_topology_change_port,
IFNAMSIZ);
assign(status->regional_root, tree->rootPriority.RRootID);
assign(status->internal_path_cost,
__be32_to_cpu(tree->rootPriority.IntRootPathCost));
assign(status->root_port_id, tree->rootPortId);
}
/* 12.8.1.3 Set CIST Bridge Protocol Parameters */
int MSTP_IN_set_cist_bridge_config(bridge_t *br, CIST_BridgeConfig *cfg)
{
bool changed, changedBridgeTimes, init;
int r = 0;
__u8 new_forward_delay, new_max_age;
tree_t *tree;
port_t *prt;
per_tree_port_t *ptp;
/* Firstly, validation */
if(cfg->set_bridge_max_age)
{
new_max_age = cfg->bridge_max_age;
if((6 > new_max_age) || (40 < new_max_age))
{
ERROR_BRNAME(br,
"Bridge Max Age must be between 6 and 40 seconds");
r = -1;
}
}
else
new_max_age = br->Max_Age;
if(cfg->set_bridge_forward_delay)
{
new_forward_delay = cfg->bridge_forward_delay;
if((4 > new_forward_delay) || (30 < new_forward_delay))
{
ERROR_BRNAME(br,
"Bridge Forward Delay must be between 4 and 30 seconds");
r = -1;
}
}
else
new_forward_delay = br->Forward_Delay;
if(cfg->set_bridge_max_age || cfg->set_bridge_forward_delay)
{
if((2 * (new_forward_delay - 1)) < new_max_age)
{
ERROR_BRNAME(br, "Configured Bridge Times don't meet "
"2 * (Bridge Foward Delay - 1 second) >= Bridge Max Age");
r = -1;
}
}
if(cfg->set_protocol_version)
{
switch(cfg->protocol_version)
{
case protoSTP:
case protoRSTP:
case protoMSTP:
break;
default:
ERROR_BRNAME(br, "Bad protocol version (%d)",
cfg->protocol_version);
r = -1;
}
}
if(cfg->set_tx_hold_count)
{
if((1 > cfg->tx_hold_count) || (10 < cfg->tx_hold_count))
{
ERROR_BRNAME(br,
"Transmit Hold Count must be between 1 and 10 seconds");
r = -1;
}
}
if(cfg->set_max_hops)
{
if((6 > cfg->max_hops) || (40 < cfg->max_hops))
{
ERROR_BRNAME(br, "Bridge Max Hops must be between 6 and 40");
r = -1;
}
}
if(cfg->set_bridge_hello_time)
{
if((1 > cfg->bridge_hello_time) || (10 < cfg->bridge_hello_time))
{
ERROR_BRNAME(br, "Bridge Hello Time must be between 1 and 10");
r = -1;
}
}
if(cfg->set_bridge_ageing_time)
{
if((10 > cfg->bridge_ageing_time)||(1000000 < cfg->bridge_ageing_time))
{
ERROR_BRNAME(br,
"Bridge Ageing Time must be between 10 and 1000000 seconds");
r = -1;
}
}
if(r)
return r;
/* Secondly, do set */
changed = changedBridgeTimes = init = false;
if(cfg->set_bridge_max_age || cfg->set_bridge_forward_delay)
{
if(cmp(new_max_age, !=, br->Max_Age)
|| cmp(new_forward_delay, !=, br->Forward_Delay)
)
{
assign(br->Max_Age, new_max_age);
assign(br->Forward_Delay, new_forward_delay);
changed = changedBridgeTimes = true;
}
}
if((cfg->set_protocol_version)
&& (cfg->protocol_version != br->ForceProtocolVersion)
)
{
br->ForceProtocolVersion = cfg->protocol_version;
changed = init = true;
}
if(cfg->set_tx_hold_count)
{
if(cfg->tx_hold_count != br->Transmit_Hold_Count)
{
assign(br->Transmit_Hold_Count, cfg->tx_hold_count);
FOREACH_PORT_IN_BRIDGE(prt, br)
assign(prt->txCount, 0u);
changed = true;
}
}
if(cfg->set_max_hops)
{
if(cfg->max_hops != br->MaxHops)
{
assign(br->MaxHops, cfg->max_hops);
changed = changedBridgeTimes = true;
}
}
if(cfg->set_bridge_hello_time)
{
if(cfg->bridge_hello_time != br->Hello_Time)
{
INFO_BRNAME(br, "bridge hello_time new=%hhu, old=%hhu",
cfg->bridge_hello_time, br->Hello_Time);
assign(br->Hello_Time, cfg->bridge_hello_time);
changed = changedBridgeTimes = true;
}
}
if(cfg->set_bridge_ageing_time)
{
if(cfg->bridge_ageing_time != br->Ageing_Time)
{
INFO_BRNAME(br, "bridge ageing_time new=%u, old=%u",
cfg->bridge_ageing_time, br->Ageing_Time);
assign(br->Ageing_Time, cfg->bridge_ageing_time);
}
}
/* Thirdly, finalize changes */
if(changedBridgeTimes)
{
FOREACH_TREE_IN_BRIDGE(tree, br)
{
assign(tree->BridgeTimes.remainingHops, br->MaxHops);
assign(tree->BridgeTimes.Forward_Delay, br->Forward_Delay);
assign(tree->BridgeTimes.Max_Age, br->Max_Age);
assign(tree->BridgeTimes.Hello_Time, br->Hello_Time);
/* Comment found in rstpd by Srinivas Aji:
* Do this for any change in BridgeTimes.
* Otherwise we fail UNH rstp.op_D test 3.2 since when administratively
* setting BridgeForwardDelay, etc, the values don't propagate from
* rootTimes to designatedTimes immediately without this change.
*/
FOREACH_PTP_IN_TREE(ptp, tree)
{
ptp->selected = false;
ptp->reselect = true;
/* TODO: change this when Hello_Time will be configurable
* per-port. For now, copy Bridge's Hello_Time
* to the port's Hello_Time.
*/
assign(ptp->portTimes.Hello_Time, br->Hello_Time);
}
}
}
if(changed && br->bridgeEnabled)
{
if(init)
br_state_machines_begin(br);
else
br_state_machines_run(br);
}
return 0;
}
/* 12.8.1.4 Set MSTI Bridge Protocol Parameters */
int MSTP_IN_set_msti_bridge_config(tree_t *tree, __u8 bridge_priority)
{
per_tree_port_t *ptp;
__u8 valuePri;
if(15 < bridge_priority)
{
ERROR_BRNAME(tree->bridge,
"MSTI %hu: Bridge Priority must be between 0 and 15",
__be16_to_cpu(tree->MSTID));
return -1;
}
valuePri = bridge_priority << 4;
if(GET_PRIORITY_FROM_IDENTIFIER(tree->BridgeIdentifier) == valuePri)
return 0;
SET_PRIORITY_IN_IDENTIFIER(valuePri, tree->BridgeIdentifier);
tree->BridgePriority.RootID = tree->BridgePriority.RRootID =
tree->BridgePriority.DesignatedBridgeID = tree->BridgeIdentifier;
/* 12.8.1.4.4 do not require reselect, but I think it is needed,
* because 12.8.1.3.4.c) requires it */
FOREACH_PTP_IN_TREE(ptp, tree)
{
ptp->selected = false;
ptp->reselect = true;
}
return 0;
}
/* 12.8.2.1 Read CIST Port Parameters */
void MSTP_IN_get_cist_port_status(port_t *prt, CIST_PortStatus *status)
{
per_tree_port_t *cist = GET_CIST_PTP_FROM_PORT(prt);
/* 12.8.2.2.3 b) */
status->uptime = (signed int)((prt->bridge)->uptime)
- (signed int)(cist->start_time);
status->state = cist->state;
assign(status->port_id, cist->portId);
assign(status->admin_external_port_path_cost,
prt->AdminExternalPortPathCost);
assign(status->external_port_path_cost, prt->ExternalPortPathCost);
assign(status->designated_root, cist->portPriority.RootID);
assign(status->designated_external_cost,
__be32_to_cpu(cist->portPriority.ExtRootPathCost));
assign(status->designated_bridge, cist->portPriority.DesignatedBridgeID);