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- Ensure the path cost does not exceed 65535 in legacy STP mode.

Browse Source 
- If the path cost is calculated when the link is down, set a pending flag so
  it is calculated again when it comes back up.
- To not use 00:00:00:00:00:00 as the bridge id, all interfaces are scanned and
  the lowest number wins. All zeros is too low.

Approved by:	re (rwatson)
This commit is contained in:
Andrew Thompson 2007-08-04 21:09:04 +00:00
parent f5cbef3c2d
commit dd04013007
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=171724
2 changed files with 31 additions and 2 deletions
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32
sys/net/bridgestp.c
View File

@ -1331,6 +1331,9 @@ bstp_set_port_proto(struct bstp_port *bp, int proto)
bstp_timer_stop(&bp->bp_migrate_delay_timer);
/* clear unsupported features */
bp->bp_operedge = 0;
/* STP compat mode only uses 16 bits of the 32 */
if (bp->bp_path_cost > 65535)
bp->bp_path_cost = 65535;
break;
case BSTP_PROTO_RSTP:
@ -1617,6 +1620,10 @@ bstp_set_path_cost(struct bstp_port *bp, uint32_t path_cost)
if (path_cost > BSTP_MAX_PATH_COST)
return (EINVAL);
/* STP compat mode only uses 16 bits of the 32 */
if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535)
path_cost = 65535;
BSTP_LOCK(bs);
if (path_cost == 0) { /* use auto */
@ -1701,6 +1708,12 @@ bstp_calc_path_cost(struct bstp_port *bp)
if (bp->bp_flags & BSTP_PORT_ADMCOST)
return bp->bp_path_cost;
if (ifp->if_link_state == LINK_STATE_DOWN) {
/* Recalc when the link comes up again */
bp->bp_flags |= BSTP_PORT_PNDCOST;
return (BSTP_DEFAULT_PATH_COST);
}
if (ifp->if_baudrate < 1000)
return (BSTP_DEFAULT_PATH_COST);
@ -1809,6 +1822,12 @@ bstp_ifupdstatus(struct bstp_state *bs, struct bstp_port *bp)
ifmr.ifm_active & IFM_FDX ? 1 : 0;
}
/* Calc the cost if the link was down previously */
if (bp->bp_flags & BSTP_PORT_PNDCOST) {
bp->bp_path_cost = bstp_calc_path_cost(bp);
bp->bp_flags &= ~BSTP_PORT_PNDCOST;
}
if (bp->bp_role == BSTP_ROLE_DISABLED)
bstp_enable_port(bs, bp);
} else {
@ -1999,6 +2018,7 @@ bstp_reinit(struct bstp_state *bs)
struct bstp_port *bp;
struct ifnet *ifp, *mif;
u_char *e_addr;
static const u_char llzero[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */
BSTP_LOCK_ASSERT(bs);
@ -2012,14 +2032,16 @@ bstp_reinit(struct bstp_state *bs)
* Search through the Ethernet adapters and find the one with the
* lowest value. The adapter which we take the MAC address from does
* not need to be part of the bridge, it just needs to be a unique
* value. It is not possible for mif to be null, at this point we have
* at least one stp port and hence at least one NIC.
* value.
*/
IFNET_RLOCK();
TAILQ_FOREACH(ifp, &ifnet, if_link) {
if (ifp->if_type != IFT_ETHER)
continue;
if (bstp_addr_cmp(IF_LLADDR(ifp), llzero) == 0)
continue;
if (mif == NULL) {
mif = ifp;
continue;
@ -2031,6 +2053,12 @@ bstp_reinit(struct bstp_state *bs)
}
IFNET_RUNLOCK();
/* Can only happen if all interfaces have a zero MAC address */
if (mif == NULL) {
callout_stop(&bs->bs_bstpcallout);
return;
}
e_addr = IF_LLADDR(mif);
bs->bs_bridge_pv.pv_dbridge_id =
(((uint64_t)bs->bs_bridge_priority) << 48) |

1
sys/net/bridgestp.h
View File

@ -110,6 +110,7 @@
#define BSTP_PORT_AUTOEDGE 0x0010
#define BSTP_PORT_AUTOPTP 0x0020
#define BSTP_PORT_ADMEDGE 0x0040
#define BSTP_PORT_PNDCOST 0x0080
/* BPDU priority */
#define BSTP_PDU_SUPERIOR 1