/* $OpenBSD: bridgestp.c,v 1.77 2021/03/10 10:21:47 jsg Exp $ */ /* * Copyright (c) 2000 Jason L. Wright (jason@thought.net) * Copyright (c) 2006 Andrew Thompson (thompsa@FreeBSD.org) * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Implementation of the spanning tree protocol as defined in * ISO/IEC 802.1D-2004, June 9, 2004. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* STP port states */ #define BSTP_IFSTATE_DISABLED 0 #define BSTP_IFSTATE_LISTENING 1 #define BSTP_IFSTATE_LEARNING 2 #define BSTP_IFSTATE_FORWARDING 3 #define BSTP_IFSTATE_BLOCKING 4 #define BSTP_IFSTATE_DISCARDING 5 #define BSTP_TCSTATE_ACTIVE 1 #define BSTP_TCSTATE_DETECTED 2 #define BSTP_TCSTATE_INACTIVE 3 #define BSTP_TCSTATE_LEARNING 4 #define BSTP_TCSTATE_PROPAG 5 #define BSTP_TCSTATE_ACK 6 #define BSTP_TCSTATE_TC 7 #define BSTP_TCSTATE_TCN 8 #define BSTP_ROLE_DISABLED 0 #define BSTP_ROLE_ROOT 1 #define BSTP_ROLE_DESIGNATED 2 #define BSTP_ROLE_ALTERNATE 3 #define BSTP_ROLE_BACKUP 4 /* STP port flags */ #define BSTP_PORT_CANMIGRATE 0x0001 #define BSTP_PORT_NEWINFO 0x0002 #define BSTP_PORT_DISPUTED 0x0004 #define BSTP_PORT_ADMCOST 0x0008 #define BSTP_PORT_AUTOEDGE 0x0010 /* BPDU priority */ #define BSTP_PDU_SUPERIOR 1 #define BSTP_PDU_REPEATED 2 #define BSTP_PDU_INFERIOR 3 #define BSTP_PDU_INFERIORALT 4 #define BSTP_PDU_OTHER 5 /* BPDU flags */ #define BSTP_PDU_PRMASK 0x0c /* Port Role */ #define BSTP_PDU_PRSHIFT 2 /* Port Role offset */ #define BSTP_PDU_F_UNKN 0x00 /* Unknown port (00) */ #define BSTP_PDU_F_ALT 0x01 /* Alt/Backup port (01) */ #define BSTP_PDU_F_ROOT 0x02 /* Root port (10) */ #define BSTP_PDU_F_DESG 0x03 /* Designated port (11) */ #define BSTP_PDU_STPMASK 0x81 /* strip unused STP flags */ #define BSTP_PDU_RSTPMASK 0x7f /* strip unused RSTP flags */ #define BSTP_PDU_F_TC 0x01 /* Topology change */ #define BSTP_PDU_F_P 0x02 /* Proposal flag */ #define BSTP_PDU_F_L 0x10 /* Learning flag */ #define BSTP_PDU_F_F 0x20 /* Forwarding flag */ #define BSTP_PDU_F_A 0x40 /* Agreement flag */ #define BSTP_PDU_F_TCA 0x80 /* Topology change ack */ /* * Spanning tree defaults. */ #define BSTP_DEFAULT_MAX_AGE (20 * 256) #define BSTP_DEFAULT_HELLO_TIME (2 * 256) #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) #define BSTP_DEFAULT_HOLD_TIME (1 * 256) #define BSTP_DEFAULT_MIGRATE_DELAY (3 * 256) #define BSTP_DEFAULT_HOLD_COUNT 6 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 #define BSTP_DEFAULT_PATH_COST 55 #define BSTP_MIN_HELLO_TIME (1 * 256) #define BSTP_MIN_MAX_AGE (6 * 256) #define BSTP_MIN_FORWARD_DELAY (4 * 256) #define BSTP_MIN_HOLD_COUNT 1 #define BSTP_MAX_HELLO_TIME (2 * 256) #define BSTP_MAX_MAX_AGE (40 * 256) #define BSTP_MAX_FORWARD_DELAY (30 * 256) #define BSTP_MAX_HOLD_COUNT 10 #define BSTP_MAX_PRIORITY 61440 #define BSTP_MAX_PORT_PRIORITY 240 #define BSTP_MAX_PATH_COST 200000000 /* BPDU message types */ #define BSTP_MSGTYPE_CFG 0x00 /* Configuration */ #define BSTP_MSGTYPE_RSTP 0x02 /* Rapid STP */ #define BSTP_MSGTYPE_TCN 0x80 /* Topology chg notification */ #define BSTP_INFO_RECEIVED 1 #define BSTP_INFO_MINE 2 #define BSTP_INFO_AGED 3 #define BSTP_INFO_DISABLED 4 #define BSTP_MESSAGE_AGE_INCR (1 * 256) /* in 256ths of a second */ #define BSTP_TICK_VAL (1 * 256) /* in 256ths of a second */ #define BSTP_LINK_TIMER (BSTP_TICK_VAL * 15) #ifdef BRIDGESTP_DEBUG #define DPRINTF(bp, fmt, arg...) \ do { \ struct ifnet *__ifp = if_get((bp)->bp_ifindex); \ printf("bstp: %s" fmt, __ifp? __ifp->if_xname : "Unknown", ##arg); \ if_put(__ifp); \ } while (0) #else #define DPRINTF(bp, fmt, arg...) #endif #define PV2ADDR(pv, eaddr) do { \ eaddr[0] = pv >> 40; \ eaddr[1] = pv >> 32; \ eaddr[2] = pv >> 24; \ eaddr[3] = pv >> 16; \ eaddr[4] = pv >> 8; \ eaddr[5] = pv >> 0; \ } while (0) #define INFO_BETTER 1 #define INFO_SAME 0 #define INFO_WORSE -1 #define BSTP_IFQ_PRIO 6 /* * Because BPDU's do not make nicely aligned structures, two different * declarations are used: bstp_?bpdu (wire representation, packed) and * bstp_*_unit (internal, nicely aligned version). */ /* configuration bridge protocol data unit */ struct bstp_cbpdu { u_int8_t cbu_dsap; /* LLC: destination sap */ u_int8_t cbu_ssap; /* LLC: source sap */ u_int8_t cbu_ctl; /* LLC: control */ u_int16_t cbu_protoid; /* protocol id */ u_int8_t cbu_protover; /* protocol version */ u_int8_t cbu_bpdutype; /* message type */ u_int8_t cbu_flags; /* flags (below) */ /* root id */ u_int16_t cbu_rootpri; /* root priority */ u_int8_t cbu_rootaddr[6]; /* root address */ u_int32_t cbu_rootpathcost; /* root path cost */ /* bridge id */ u_int16_t cbu_bridgepri; /* bridge priority */ u_int8_t cbu_bridgeaddr[6]; /* bridge address */ u_int16_t cbu_portid; /* port id */ u_int16_t cbu_messageage; /* current message age */ u_int16_t cbu_maxage; /* maximum age */ u_int16_t cbu_hellotime; /* hello time */ u_int16_t cbu_forwarddelay; /* forwarding delay */ u_int8_t cbu_versionlen; /* version 1 length */ } __packed; #define BSTP_BPDU_STP_LEN (3 + 35) /* LLC + STP pdu */ #define BSTP_BPDU_RSTP_LEN (3 + 36) /* LLC + RSTP pdu */ /* topology change notification bridge protocol data unit */ struct bstp_tbpdu { u_int8_t tbu_dsap; /* LLC: destination sap */ u_int8_t tbu_ssap; /* LLC: source sap */ u_int8_t tbu_ctl; /* LLC: control */ u_int16_t tbu_protoid; /* protocol id */ u_int8_t tbu_protover; /* protocol version */ u_int8_t tbu_bpdutype; /* message type */ } __packed; const u_int8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; void bstp_transmit(struct bstp_state *, struct bstp_port *); void bstp_transmit_bpdu(struct bstp_state *, struct bstp_port *); void bstp_transmit_tcn(struct bstp_state *, struct bstp_port *); void bstp_decode_bpdu(struct bstp_port *, struct bstp_cbpdu *, struct bstp_config_unit *); void bstp_send_bpdu(struct bstp_state *, struct bstp_port *, struct bstp_cbpdu *); int bstp_pdu_flags(struct bstp_port *); void bstp_received_stp(struct bstp_state *, struct bstp_port *, struct mbuf **, struct bstp_tbpdu *); void bstp_received_rstp(struct bstp_state *, struct bstp_port *, struct mbuf **, struct bstp_tbpdu *); void bstp_received_tcn(struct bstp_state *, struct bstp_port *, struct bstp_tcn_unit *); void bstp_received_bpdu(struct bstp_state *, struct bstp_port *, struct bstp_config_unit *); int bstp_pdu_rcvtype(struct bstp_port *, struct bstp_config_unit *); int bstp_pdu_bettersame(struct bstp_port *, int); int bstp_info_cmp(struct bstp_pri_vector *, struct bstp_pri_vector *); int bstp_info_superior(struct bstp_pri_vector *, struct bstp_pri_vector *); void bstp_assign_roles(struct bstp_state *); void bstp_update_roles(struct bstp_state *, struct bstp_port *); void bstp_update_state(struct bstp_state *, struct bstp_port *); void bstp_update_tc(struct bstp_port *); void bstp_update_info(struct bstp_port *); void bstp_set_other_tcprop(struct bstp_port *); void bstp_set_all_reroot(struct bstp_state *); void bstp_set_all_sync(struct bstp_state *); void bstp_set_port_state(struct bstp_port *, int); void bstp_set_port_role(struct bstp_port *, int); void bstp_set_port_proto(struct bstp_port *, int); void bstp_set_port_tc(struct bstp_port *, int); void bstp_set_timer_tc(struct bstp_port *); void bstp_set_timer_msgage(struct bstp_port *); void bstp_reset(struct bstp_state *); int bstp_rerooted(struct bstp_state *, struct bstp_port *); u_int32_t bstp_calc_path_cost(struct bstp_port *); void bstp_notify_rtage(struct bstp_port *, int); void bstp_ifupdstatus(struct bstp_state *, struct bstp_port *); void bstp_enable_port(struct bstp_state *, struct bstp_port *); void bstp_disable_port(struct bstp_state *, struct bstp_port *); void bstp_tick(void *); void bstp_timer_start(struct bstp_timer *, u_int16_t); void bstp_timer_stop(struct bstp_timer *); void bstp_timer_latch(struct bstp_timer *); int bstp_timer_expired(struct bstp_timer *); void bstp_hello_timer_expiry(struct bstp_state *, struct bstp_port *); void bstp_message_age_expiry(struct bstp_state *, struct bstp_port *); void bstp_migrate_delay_expiry(struct bstp_state *, struct bstp_port *); void bstp_edge_delay_expiry(struct bstp_state *, struct bstp_port *); int bstp_addr_cmp(const u_int8_t *, const u_int8_t *); int bstp_same_bridgeid(u_int64_t, u_int64_t); void bstp_transmit(struct bstp_state *bs, struct bstp_port *bp) { struct ifnet *ifp; if ((ifp = if_get(bs->bs_ifindex)) == NULL) return; if ((ifp->if_flags & IFF_RUNNING) == 0 || bp == NULL) { if_put(ifp); return; } if_put(ifp); /* * a PDU can only be sent if we have tx quota left and the * hello timer is running. */ if (bp->bp_hello_timer.active == 0) { /* Test if it needs to be reset */ bstp_hello_timer_expiry(bs, bp); return; } if (bp->bp_txcount > bs->bs_txholdcount) /* Ran out of karma */ return; if (bp->bp_protover == BSTP_PROTO_RSTP) { bstp_transmit_bpdu(bs, bp); bp->bp_tc_ack = 0; } else { /* STP */ switch (bp->bp_role) { case BSTP_ROLE_DESIGNATED: bstp_transmit_bpdu(bs, bp); bp->bp_tc_ack = 0; break; case BSTP_ROLE_ROOT: bstp_transmit_tcn(bs, bp); break; } } bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); bp->bp_flags &= ~BSTP_PORT_NEWINFO; } void bstp_transmit_bpdu(struct bstp_state *bs, struct bstp_port *bp) { struct bstp_cbpdu bpdu; bpdu.cbu_rootpri = htons(bp->bp_desg_pv.pv_root_id >> 48); PV2ADDR(bp->bp_desg_pv.pv_root_id, bpdu.cbu_rootaddr); bpdu.cbu_rootpathcost = htonl(bp->bp_desg_pv.pv_cost); bpdu.cbu_bridgepri = htons(bp->bp_desg_pv.pv_dbridge_id >> 48); PV2ADDR(bp->bp_desg_pv.pv_dbridge_id, bpdu.cbu_bridgeaddr); bpdu.cbu_portid = htons(bp->bp_port_id); bpdu.cbu_messageage = htons(bp->bp_desg_msg_age); bpdu.cbu_maxage = htons(bp->bp_desg_max_age); bpdu.cbu_hellotime = htons(bp->bp_desg_htime); bpdu.cbu_forwarddelay = htons(bp->bp_desg_fdelay); bpdu.cbu_flags = bstp_pdu_flags(bp); switch (bp->bp_protover) { case BSTP_PROTO_STP: bpdu.cbu_bpdutype = BSTP_MSGTYPE_CFG; break; case BSTP_PROTO_RSTP: bpdu.cbu_bpdutype = BSTP_MSGTYPE_RSTP; break; } bstp_send_bpdu(bs, bp, &bpdu); } void bstp_transmit_tcn(struct bstp_state *bs, struct bstp_port *bp) { struct bstp_tbpdu bpdu; struct ifnet *ifp; struct ether_header *eh; struct mbuf *m; if ((ifp = if_get(bp->bp_ifindex)) == NULL) return; if ((ifp->if_flags & IFF_RUNNING) == 0) goto rele; MGETHDR(m, M_DONTWAIT, MT_DATA); if (m == NULL) goto rele; m->m_pkthdr.ph_ifidx = ifp->if_index; m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu); m->m_pkthdr.pf.prio = BSTP_IFQ_PRIO; m->m_len = m->m_pkthdr.len; eh = mtod(m, struct ether_header *); bcopy(LLADDR(ifp->if_sadl), eh->ether_shost, ETHER_ADDR_LEN); bcopy(bstp_etheraddr, eh->ether_dhost, ETHER_ADDR_LEN); eh->ether_type = htons(sizeof(bpdu)); bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP; bpdu.tbu_ctl = LLC_UI; bpdu.tbu_protoid = 0; bpdu.tbu_protover = 0; bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN; bcopy(&bpdu, mtod(m, caddr_t) + sizeof(*eh), sizeof(bpdu)); bp->bp_txcount++; if_enqueue(ifp, m); rele: if_put(ifp); } void bstp_decode_bpdu(struct bstp_port *bp, struct bstp_cbpdu *cpdu, struct bstp_config_unit *cu) { int flags; cu->cu_pv.pv_root_id = (((u_int64_t)ntohs(cpdu->cbu_rootpri)) << 48) | (((u_int64_t)cpdu->cbu_rootaddr[0]) << 40) | (((u_int64_t)cpdu->cbu_rootaddr[1]) << 32) | (((u_int64_t)cpdu->cbu_rootaddr[2]) << 24) | (((u_int64_t)cpdu->cbu_rootaddr[3]) << 16) | (((u_int64_t)cpdu->cbu_rootaddr[4]) << 8) | (((u_int64_t)cpdu->cbu_rootaddr[5]) << 0); cu->cu_pv.pv_dbridge_id = (((u_int64_t)ntohs(cpdu->cbu_bridgepri)) << 48) | (((u_int64_t)cpdu->cbu_bridgeaddr[0]) << 40) | (((u_int64_t)cpdu->cbu_bridgeaddr[1]) << 32) | (((u_int64_t)cpdu->cbu_bridgeaddr[2]) << 24) | (((u_int64_t)cpdu->cbu_bridgeaddr[3]) << 16) | (((u_int64_t)cpdu->cbu_bridgeaddr[4]) << 8) | (((u_int64_t)cpdu->cbu_bridgeaddr[5]) << 0); cu->cu_pv.pv_cost = ntohl(cpdu->cbu_rootpathcost); cu->cu_message_age = ntohs(cpdu->cbu_messageage); cu->cu_max_age = ntohs(cpdu->cbu_maxage); cu->cu_hello_time = ntohs(cpdu->cbu_hellotime); cu->cu_forward_delay = ntohs(cpdu->cbu_forwarddelay); cu->cu_pv.pv_dport_id = ntohs(cpdu->cbu_portid); cu->cu_pv.pv_port_id = bp->bp_port_id; cu->cu_message_type = cpdu->cbu_bpdutype; /* Strip off unused flags in STP mode */ flags = cpdu->cbu_flags; switch (cpdu->cbu_protover) { case BSTP_PROTO_STP: flags &= BSTP_PDU_STPMASK; /* A STP BPDU explicitly conveys a Designated Port */ cu->cu_role = BSTP_ROLE_DESIGNATED; break; case BSTP_PROTO_RSTP: flags &= BSTP_PDU_RSTPMASK; break; } cu->cu_topology_change_ack = (flags & BSTP_PDU_F_TCA) ? 1 : 0; cu->cu_proposal = (flags & BSTP_PDU_F_P) ? 1 : 0; cu->cu_agree = (flags & BSTP_PDU_F_A) ? 1 : 0; cu->cu_learning = (flags & BSTP_PDU_F_L) ? 1 : 0; cu->cu_forwarding = (flags & BSTP_PDU_F_F) ? 1 : 0; cu->cu_topology_change = (flags & BSTP_PDU_F_TC) ? 1 : 0; switch ((flags & BSTP_PDU_PRMASK) >> BSTP_PDU_PRSHIFT) { case BSTP_PDU_F_ROOT: cu->cu_role = BSTP_ROLE_ROOT; break; case BSTP_PDU_F_ALT: cu->cu_role = BSTP_ROLE_ALTERNATE; break; case BSTP_PDU_F_DESG: cu->cu_role = BSTP_ROLE_DESIGNATED; break; } } void bstp_send_bpdu(struct bstp_state *bs, struct bstp_port *bp, struct bstp_cbpdu *bpdu) { struct ifnet *ifp; struct mbuf *m; struct ether_header *eh; int s; s = splnet(); if ((ifp = if_get(bp->bp_ifindex)) == NULL) goto done; if ((ifp->if_flags & IFF_RUNNING) == 0) goto rele; MGETHDR(m, M_DONTWAIT, MT_DATA); if (m == NULL) goto rele; eh = mtod(m, struct ether_header *); bpdu->cbu_ssap = bpdu->cbu_dsap = LLC_8021D_LSAP; bpdu->cbu_ctl = LLC_UI; bpdu->cbu_protoid = htons(BSTP_PROTO_ID); memcpy(eh->ether_shost, LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); switch (bpdu->cbu_bpdutype) { case BSTP_MSGTYPE_CFG: bpdu->cbu_protover = BSTP_PROTO_STP; m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_STP_LEN; eh->ether_type = htons(BSTP_BPDU_STP_LEN); memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu, BSTP_BPDU_STP_LEN); break; case BSTP_MSGTYPE_RSTP: bpdu->cbu_protover = BSTP_PROTO_RSTP; bpdu->cbu_versionlen = htons(0); m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_RSTP_LEN; eh->ether_type = htons(BSTP_BPDU_RSTP_LEN); memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu, BSTP_BPDU_RSTP_LEN); break; default: panic("not implemented"); } m->m_pkthdr.ph_ifidx = ifp->if_index; m->m_len = m->m_pkthdr.len; m->m_pkthdr.pf.prio = BSTP_IFQ_PRIO; bp->bp_txcount++; if_enqueue(ifp, m); rele: if_put(ifp); done: splx(s); } int bstp_pdu_flags(struct bstp_port *bp) { int flags = 0; if (bp->bp_proposing && bp->bp_state != BSTP_IFSTATE_FORWARDING) flags |= BSTP_PDU_F_P; if (bp->bp_agree) flags |= BSTP_PDU_F_A; if (bp->bp_tc_timer.active) flags |= BSTP_PDU_F_TC; if (bp->bp_tc_ack) flags |= BSTP_PDU_F_TCA; switch (bp->bp_state) { case BSTP_IFSTATE_LEARNING: flags |= BSTP_PDU_F_L; break; case BSTP_IFSTATE_FORWARDING: flags |= (BSTP_PDU_F_L | BSTP_PDU_F_F); break; } switch (bp->bp_role) { case BSTP_ROLE_ROOT: flags |= (BSTP_PDU_F_ROOT << BSTP_PDU_PRSHIFT); break; case BSTP_ROLE_ALTERNATE: case BSTP_ROLE_BACKUP: flags |= (BSTP_PDU_F_ALT << BSTP_PDU_PRSHIFT); break; case BSTP_ROLE_DESIGNATED: flags |= (BSTP_PDU_F_DESG << BSTP_PDU_PRSHIFT); break; } /* Strip off unused flags in either mode */ switch (bp->bp_protover) { case BSTP_PROTO_STP: flags &= BSTP_PDU_STPMASK; break; case BSTP_PROTO_RSTP: flags &= BSTP_PDU_RSTPMASK; break; } return (flags); } struct mbuf * bstp_input(struct bstp_state *bs, struct bstp_port *bp, struct ether_header *eh, struct mbuf *m) { struct bstp_tbpdu tpdu; u_int16_t len; if (bs == NULL || bp == NULL || bp->bp_active == 0) return (m); len = ntohs(eh->ether_type); if (len < sizeof(tpdu)) goto out; m_adj(m, ETHER_HDR_LEN); if (m->m_pkthdr.len > len) m_adj(m, len - m->m_pkthdr.len); if ((m = m_pullup(m, sizeof(tpdu))) == NULL) goto out; bcopy(mtod(m, struct tpdu *), &tpdu, sizeof(tpdu)); if (tpdu.tbu_dsap != LLC_8021D_LSAP || tpdu.tbu_ssap != LLC_8021D_LSAP || tpdu.tbu_ctl != LLC_UI) goto out; if (tpdu.tbu_protoid != BSTP_PROTO_ID) goto out; /* * We can treat later versions of the PDU as the same as the maximum * version we implement. All additional parameters/flags are ignored. */ if (tpdu.tbu_protover > BSTP_PROTO_MAX) tpdu.tbu_protover = BSTP_PROTO_MAX; if (tpdu.tbu_protover != bp->bp_protover) { /* * Wait for the migration delay timer to expire before changing * protocol version to avoid flip-flops. */ if (bp->bp_flags & BSTP_PORT_CANMIGRATE) bstp_set_port_proto(bp, tpdu.tbu_protover); else goto out; } /* Clear operedge upon receiving a PDU on the port */ bp->bp_operedge = 0; bstp_timer_start(&bp->bp_edge_delay_timer, BSTP_DEFAULT_MIGRATE_DELAY); switch (tpdu.tbu_protover) { case BSTP_PROTO_STP: bstp_received_stp(bs, bp, &m, &tpdu); break; case BSTP_PROTO_RSTP: bstp_received_rstp(bs, bp, &m, &tpdu); break; } out: m_freem(m); return (NULL); } void bstp_received_stp(struct bstp_state *bs, struct bstp_port *bp, struct mbuf **mp, struct bstp_tbpdu *tpdu) { struct bstp_cbpdu cpdu; struct bstp_config_unit *cu = &bp->bp_msg_cu; struct bstp_tcn_unit tu; switch (tpdu->tbu_bpdutype) { case BSTP_MSGTYPE_TCN: tu.tu_message_type = tpdu->tbu_bpdutype; bstp_received_tcn(bs, bp, &tu); break; case BSTP_MSGTYPE_CFG: if ((*mp)->m_len < BSTP_BPDU_STP_LEN && (*mp = m_pullup(*mp, BSTP_BPDU_STP_LEN)) == NULL) return; memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_STP_LEN); bstp_decode_bpdu(bp, &cpdu, cu); bstp_received_bpdu(bs, bp, cu); break; } } void bstp_received_rstp(struct bstp_state *bs, struct bstp_port *bp, struct mbuf **mp, struct bstp_tbpdu *tpdu) { struct bstp_cbpdu cpdu; struct bstp_config_unit *cu = &bp->bp_msg_cu; if (tpdu->tbu_bpdutype != BSTP_MSGTYPE_RSTP) return; if ((*mp)->m_len < BSTP_BPDU_RSTP_LEN && (*mp = m_pullup(*mp, BSTP_BPDU_RSTP_LEN)) == NULL) return; memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_RSTP_LEN); bstp_decode_bpdu(bp, &cpdu, cu); bstp_received_bpdu(bs, bp, cu); } void bstp_received_tcn(struct bstp_state *bs, struct bstp_port *bp, struct bstp_tcn_unit *tcn) { bp->bp_rcvdtcn = 1; bstp_update_tc(bp); } void bstp_received_bpdu(struct bstp_state *bs, struct bstp_port *bp, struct bstp_config_unit *cu) { int type; /* We need to have transitioned to INFO_MINE before proceeding */ switch (bp->bp_infois) { case BSTP_INFO_DISABLED: case BSTP_INFO_AGED: return; } type = bstp_pdu_rcvtype(bp, cu); switch (type) { case BSTP_PDU_SUPERIOR: bs->bs_allsynced = 0; bp->bp_agreed = 0; bp->bp_proposing = 0; if (cu->cu_proposal && cu->cu_forwarding == 0) bp->bp_proposed = 1; if (cu->cu_topology_change) bp->bp_rcvdtc = 1; if (cu->cu_topology_change_ack) bp->bp_rcvdtca = 1; if (bp->bp_agree && !bstp_pdu_bettersame(bp, BSTP_INFO_RECEIVED)) bp->bp_agree = 0; /* copy the received priority and timers to the port */ bp->bp_port_pv = cu->cu_pv; bp->bp_port_msg_age = cu->cu_message_age; bp->bp_port_max_age = cu->cu_max_age; bp->bp_port_fdelay = cu->cu_forward_delay; bp->bp_port_htime = (cu->cu_hello_time > BSTP_MIN_HELLO_TIME ? cu->cu_hello_time : BSTP_MIN_HELLO_TIME); /* set expiry for the new info */ bstp_set_timer_msgage(bp); bp->bp_infois = BSTP_INFO_RECEIVED; bstp_assign_roles(bs); break; case BSTP_PDU_REPEATED: if (cu->cu_proposal && cu->cu_forwarding == 0) bp->bp_proposed = 1; if (cu->cu_topology_change) bp->bp_rcvdtc = 1; if (cu->cu_topology_change_ack) bp->bp_rcvdtca = 1; /* rearm the age timer */ bstp_set_timer_msgage(bp); break; case BSTP_PDU_INFERIOR: if (cu->cu_learning) { bp->bp_agreed = 1; bp->bp_proposing = 0; } break; case BSTP_PDU_INFERIORALT: /* * only point to point links are allowed fast * transitions to forwarding. */ if (cu->cu_agree && bp->bp_ptp_link) { bp->bp_agreed = 1; bp->bp_proposing = 0; } else bp->bp_agreed = 0; if (cu->cu_topology_change) bp->bp_rcvdtc = 1; if (cu->cu_topology_change_ack) bp->bp_rcvdtca = 1; break; case BSTP_PDU_OTHER: return; /* do nothing */ } /* update the state machines with the new data */ bstp_update_state(bs, bp); } int bstp_pdu_rcvtype(struct bstp_port *bp, struct bstp_config_unit *cu) { int type; /* default return type */ type = BSTP_PDU_OTHER; switch (cu->cu_role) { case BSTP_ROLE_DESIGNATED: if (bstp_info_superior(&bp->bp_port_pv, &cu->cu_pv)) /* bpdu priority is superior */ type = BSTP_PDU_SUPERIOR; else if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) == INFO_SAME) { if (bp->bp_port_msg_age != cu->cu_message_age || bp->bp_port_max_age != cu->cu_max_age || bp->bp_port_fdelay != cu->cu_forward_delay || bp->bp_port_htime != cu->cu_hello_time) /* bpdu priority is equal and timers differ */ type = BSTP_PDU_SUPERIOR; else /* bpdu is equal */ type = BSTP_PDU_REPEATED; } else /* bpdu priority is worse */ type = BSTP_PDU_INFERIOR; break; case BSTP_ROLE_ROOT: case BSTP_ROLE_ALTERNATE: case BSTP_ROLE_BACKUP: if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) <= INFO_SAME) /* * not a designated port and priority is the same or * worse */ type = BSTP_PDU_INFERIORALT; break; } return (type); } int bstp_pdu_bettersame(struct bstp_port *bp, int newinfo) { if (newinfo == BSTP_INFO_RECEIVED && bp->bp_infois == BSTP_INFO_RECEIVED && bstp_info_cmp(&bp->bp_port_pv, &bp->bp_msg_cu.cu_pv) >= INFO_SAME) return (1); if (newinfo == BSTP_INFO_MINE && bp->bp_infois == BSTP_INFO_MINE && bstp_info_cmp(&bp->bp_port_pv, &bp->bp_desg_pv) >= INFO_SAME) return (1); return (0); } int bstp_info_cmp(struct bstp_pri_vector *pv, struct bstp_pri_vector *cpv) { if (cpv->pv_root_id < pv->pv_root_id) return (INFO_BETTER); if (cpv->pv_root_id > pv->pv_root_id) return (INFO_WORSE); if (cpv->pv_cost < pv->pv_cost) return (INFO_BETTER); if (cpv->pv_cost > pv->pv_cost) return (INFO_WORSE); if (cpv->pv_dbridge_id < pv->pv_dbridge_id) return (INFO_BETTER); if (cpv->pv_dbridge_id > pv->pv_dbridge_id) return (INFO_WORSE); if (cpv->pv_dport_id < pv->pv_dport_id) return (INFO_BETTER); if (cpv->pv_dport_id > pv->pv_dport_id) return (INFO_WORSE); return (INFO_SAME); } /* * This message priority vector is superior to the port priority vector and * will replace it if, and only if, the message priority vector is better than * the port priority vector, or the message has been transmitted from the same * designated bridge and designated port as the port priority vector. */ int bstp_info_superior(struct bstp_pri_vector *pv, struct bstp_pri_vector *cpv) { if (bstp_info_cmp(pv, cpv) == INFO_BETTER || (bstp_same_bridgeid(pv->pv_dbridge_id, cpv->pv_dbridge_id) && (cpv->pv_dport_id & 0xfff) == (pv->pv_dport_id & 0xfff))) return (1); return (0); } void bstp_reset(struct bstp_state *bs) { /* default to our priority vector */ bs->bs_root_pv = bs->bs_bridge_pv; bs->bs_root_msg_age = 0; bs->bs_root_max_age = bs->bs_bridge_max_age; bs->bs_root_fdelay = bs->bs_bridge_fdelay; bs->bs_root_htime = bs->bs_bridge_htime; bs->bs_root_port = NULL; } void bstp_assign_roles(struct bstp_state *bs) { struct bstp_port *bp, *rbp = NULL; struct bstp_pri_vector pv; bstp_reset(bs); /* check if any received info supersedes us */ LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { if (bp->bp_infois != BSTP_INFO_RECEIVED) continue; pv = bp->bp_port_pv; pv.pv_cost += bp->bp_path_cost; /* * The root priority vector is the best of the set comprising * the bridge priority vector plus all root path priority * vectors whose bridge address is not equal to us. */ if (bstp_same_bridgeid(pv.pv_dbridge_id, bs->bs_bridge_pv.pv_dbridge_id) == 0 && bstp_info_cmp(&bs->bs_root_pv, &pv) == INFO_BETTER) { /* the port vector replaces the root */ bs->bs_root_pv = pv; bs->bs_root_msg_age = bp->bp_port_msg_age + BSTP_MESSAGE_AGE_INCR; bs->bs_root_max_age = bp->bp_port_max_age; bs->bs_root_fdelay = bp->bp_port_fdelay; bs->bs_root_htime = bp->bp_port_htime; rbp = bp; } } LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { /* calculate the port designated vector */ bp->bp_desg_pv.pv_root_id = bs->bs_root_pv.pv_root_id; bp->bp_desg_pv.pv_cost = bs->bs_root_pv.pv_cost; bp->bp_desg_pv.pv_dbridge_id = bs->bs_bridge_pv.pv_dbridge_id; bp->bp_desg_pv.pv_dport_id = bp->bp_port_id; bp->bp_desg_pv.pv_port_id = bp->bp_port_id; /* calculate designated times */ bp->bp_desg_msg_age = bs->bs_root_msg_age; bp->bp_desg_max_age = bs->bs_root_max_age; bp->bp_desg_fdelay = bs->bs_root_fdelay; bp->bp_desg_htime = bs->bs_bridge_htime; switch (bp->bp_infois) { case BSTP_INFO_DISABLED: bstp_set_port_role(bp, BSTP_ROLE_DISABLED); break; case BSTP_INFO_AGED: bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); bstp_update_info(bp); break; case BSTP_INFO_MINE: bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); /* update the port info if stale */ if (bstp_info_cmp(&bp->bp_port_pv, &bp->bp_desg_pv) != INFO_SAME || (rbp != NULL && (bp->bp_port_msg_age != rbp->bp_port_msg_age || bp->bp_port_max_age != rbp->bp_port_max_age || bp->bp_port_fdelay != rbp->bp_port_fdelay || bp->bp_port_htime != rbp->bp_port_htime))) bstp_update_info(bp); break; case BSTP_INFO_RECEIVED: if (bp == rbp) { /* * root priority is derived from this * port, make it the root port. */ bstp_set_port_role(bp, BSTP_ROLE_ROOT); bs->bs_root_port = bp; } else if (bstp_info_cmp(&bp->bp_port_pv, &bp->bp_desg_pv) == INFO_BETTER) { /* * the port priority is lower than the root * port. */ bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED); bstp_update_info(bp); } else { if (bstp_same_bridgeid( bp->bp_port_pv.pv_dbridge_id, bs->bs_bridge_pv.pv_dbridge_id)) { /* * the designated bridge refers to * another port on this bridge. */ bstp_set_port_role(bp, BSTP_ROLE_BACKUP); } else { /* * the port is an inferior path to the * root bridge. */ bstp_set_port_role(bp, BSTP_ROLE_ALTERNATE); } } break; } } } void bstp_update_state(struct bstp_state *bs, struct bstp_port *bp) { struct bstp_port *bp2; int synced; /* check if all the ports have synchronized again */ if (!bs->bs_allsynced) { synced = 1; LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { if (!(bp2->bp_synced || bp2->bp_role == BSTP_ROLE_ROOT)) { synced = 0; break; } } bs->bs_allsynced = synced; } bstp_update_roles(bs, bp); bstp_update_tc(bp); } void bstp_update_roles(struct bstp_state *bs, struct bstp_port *bp) { switch (bp->bp_role) { case BSTP_ROLE_DISABLED: /* Clear any flags if set */ if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { bp->bp_sync = 0; bp->bp_synced = 1; bp->bp_reroot = 0; } break; case BSTP_ROLE_ALTERNATE: case BSTP_ROLE_BACKUP: if ((bs->bs_allsynced && !bp->bp_agree) || (bp->bp_proposed && bp->bp_agree)) { bp->bp_proposed = 0; bp->bp_agree = 1; bp->bp_flags |= BSTP_PORT_NEWINFO; DPRINTF(bp, "-> ALTERNATE_AGREED\n"); } if (bp->bp_proposed && !bp->bp_agree) { bstp_set_all_sync(bs); bp->bp_proposed = 0; DPRINTF(bp, "-> ALTERNATE_PROPOSED\n"); } /* Clear any flags if set */ if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) { bp->bp_sync = 0; bp->bp_synced = 1; bp->bp_reroot = 0; DPRINTF(bp, "-> ALTERNATE_PORT\n"); } break; case BSTP_ROLE_ROOT: if (bp->bp_state != BSTP_IFSTATE_FORWARDING && !bp->bp_reroot) { bstp_set_all_reroot(bs); DPRINTF(bp, "-> ROOT_REROOT\n"); } if ((bs->bs_allsynced && !bp->bp_agree) || (bp->bp_proposed && bp->bp_agree)) { bp->bp_proposed = 0; bp->bp_sync = 0; bp->bp_agree = 1; bp->bp_flags |= BSTP_PORT_NEWINFO; DPRINTF(bp, "-> ROOT_AGREED\n"); } if (bp->bp_proposed && !bp->bp_agree) { bstp_set_all_sync(bs); bp->bp_proposed = 0; DPRINTF(bp, "-> ROOT_PROPOSED\n"); } if (bp->bp_state != BSTP_IFSTATE_FORWARDING && (bp->bp_forward_delay_timer.active == 0 || (bstp_rerooted(bs, bp) && bp->bp_recent_backup_timer.active == 0 && bp->bp_protover == BSTP_PROTO_RSTP))) { switch (bp->bp_state) { case BSTP_IFSTATE_DISCARDING: bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); break; case BSTP_IFSTATE_LEARNING: bstp_set_port_state(bp, BSTP_IFSTATE_FORWARDING); break; } } if (bp->bp_state == BSTP_IFSTATE_FORWARDING && bp->bp_reroot) { bp->bp_reroot = 0; DPRINTF(bp, "-> ROOT_REROOTED\n"); } break; case BSTP_ROLE_DESIGNATED: if (bp->bp_recent_root_timer.active == 0 && bp->bp_reroot) { bp->bp_reroot = 0; DPRINTF(bp, "-> DESIGNATED_RETIRED\n"); } if ((bp->bp_state == BSTP_IFSTATE_DISCARDING && !bp->bp_synced) || (bp->bp_agreed && !bp->bp_synced) || (bp->bp_operedge && !bp->bp_synced) || (bp->bp_sync && bp->bp_synced)) { bstp_timer_stop(&bp->bp_recent_root_timer); bp->bp_synced = 1; bp->bp_sync = 0; DPRINTF(bp, "-> DESIGNATED_SYNCED\n"); } if (bp->bp_state != BSTP_IFSTATE_FORWARDING && !bp->bp_agreed && !bp->bp_proposing && !bp->bp_operedge) { bp->bp_proposing = 1; bp->bp_flags |= BSTP_PORT_NEWINFO; bstp_timer_start(&bp->bp_edge_delay_timer, (bp->bp_ptp_link ? BSTP_DEFAULT_MIGRATE_DELAY : bp->bp_desg_max_age)); DPRINTF(bp, "-> DESIGNATED_PROPOSE\n"); } if (bp->bp_state != BSTP_IFSTATE_FORWARDING && (bp->bp_forward_delay_timer.active == 0 || bp->bp_agreed || bp->bp_operedge) && (bp->bp_recent_root_timer.active == 0 || !bp->bp_reroot) && !bp->bp_sync) { if (bp->bp_agreed) DPRINTF(bp, "-> AGREED\n"); /* * If agreed|operedge then go straight to forwarding, * otherwise follow discard -> learn -> forward. */ if (bp->bp_agreed || bp->bp_operedge || bp->bp_state == BSTP_IFSTATE_LEARNING) { bstp_set_port_state(bp, BSTP_IFSTATE_FORWARDING); bp->bp_agreed = bp->bp_protover; } else if (bp->bp_state == BSTP_IFSTATE_DISCARDING) bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING); } if (((bp->bp_sync && !bp->bp_synced) || (bp->bp_reroot && bp->bp_recent_root_timer.active) || (bp->bp_flags & BSTP_PORT_DISPUTED)) && !bp->bp_operedge && bp->bp_state != BSTP_IFSTATE_DISCARDING) { bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); bp->bp_flags &= ~BSTP_PORT_DISPUTED; bstp_timer_start(&bp->bp_forward_delay_timer, bp->bp_protover == BSTP_PROTO_RSTP ? bp->bp_desg_htime : bp->bp_desg_fdelay); DPRINTF(bp, "-> DESIGNATED_DISCARD\n"); } break; } if (bp->bp_flags & BSTP_PORT_NEWINFO) bstp_transmit(bs, bp); } void bstp_update_tc(struct bstp_port *bp) { switch (bp->bp_tcstate) { case BSTP_TCSTATE_ACTIVE: if ((bp->bp_role != BSTP_ROLE_DESIGNATED && bp->bp_role != BSTP_ROLE_ROOT) || bp->bp_operedge) bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); if (bp->bp_rcvdtcn) bstp_set_port_tc(bp, BSTP_TCSTATE_TCN); if (bp->bp_rcvdtc) bstp_set_port_tc(bp, BSTP_TCSTATE_TC); if (bp->bp_tc_prop && !bp->bp_operedge) bstp_set_port_tc(bp, BSTP_TCSTATE_PROPAG); if (bp->bp_rcvdtca) bstp_set_port_tc(bp, BSTP_TCSTATE_ACK); break; case BSTP_TCSTATE_INACTIVE: if ((bp->bp_state == BSTP_IFSTATE_LEARNING || bp->bp_state == BSTP_IFSTATE_FORWARDING) && bp->bp_fdbflush == 0) bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); break; case BSTP_TCSTATE_LEARNING: if (bp->bp_rcvdtc || bp->bp_rcvdtcn || bp->bp_rcvdtca || bp->bp_tc_prop) bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING); else if (bp->bp_role != BSTP_ROLE_DESIGNATED && bp->bp_role != BSTP_ROLE_ROOT && bp->bp_state == BSTP_IFSTATE_DISCARDING) bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); if ((bp->bp_role == BSTP_ROLE_DESIGNATED || bp->bp_role == BSTP_ROLE_ROOT) && bp->bp_state == BSTP_IFSTATE_FORWARDING && !bp->bp_operedge) bstp_set_port_tc(bp, BSTP_TCSTATE_DETECTED); break; /* these are transient states and go straight back to ACTIVE */ case BSTP_TCSTATE_DETECTED: case BSTP_TCSTATE_TCN: case BSTP_TCSTATE_TC: case BSTP_TCSTATE_PROPAG: case BSTP_TCSTATE_ACK: DPRINTF(bp, "Invalid TC state\n"); break; } } void bstp_update_info(struct bstp_port *bp) { struct bstp_state *bs = bp->bp_bs; bp->bp_proposing = 0; bp->bp_proposed = 0; if (bp->bp_agreed && !bstp_pdu_bettersame(bp, BSTP_INFO_MINE)) bp->bp_agreed = 0; if (bp->bp_synced && !bp->bp_agreed) { bp->bp_synced = 0; bs->bs_allsynced = 0; } /* copy the designated pv to the port */ bp->bp_port_pv = bp->bp_desg_pv; bp->bp_port_msg_age = bp->bp_desg_msg_age; bp->bp_port_max_age = bp->bp_desg_max_age; bp->bp_port_fdelay = bp->bp_desg_fdelay; bp->bp_port_htime = bp->bp_desg_htime; bp->bp_infois = BSTP_INFO_MINE; /* Set transmit flag but do not immediately send */ bp->bp_flags |= BSTP_PORT_NEWINFO; } /* set tcprop on every port other than the caller */ void bstp_set_other_tcprop(struct bstp_port *bp) { struct bstp_state *bs = bp->bp_bs; struct bstp_port *bp2; LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { if (bp2 == bp) continue; bp2->bp_tc_prop = 1; } } void bstp_set_all_reroot(struct bstp_state *bs) { struct bstp_port *bp; LIST_FOREACH(bp, &bs->bs_bplist, bp_next) bp->bp_reroot = 1; } void bstp_set_all_sync(struct bstp_state *bs) { struct bstp_port *bp; LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { bp->bp_sync = 1; bp->bp_synced = 0; /* Not explicit in spec */ } bs->bs_allsynced = 0; } void bstp_set_port_state(struct bstp_port *bp, int state) { if (bp->bp_state == state) return; bp->bp_state = state; switch (bp->bp_state) { case BSTP_IFSTATE_DISCARDING: DPRINTF(bp, "state changed to DISCARDING\n"); break; case BSTP_IFSTATE_LEARNING: DPRINTF(bp, "state changed to LEARNING\n"); bstp_timer_start(&bp->bp_forward_delay_timer, bp->bp_protover == BSTP_PROTO_RSTP ? bp->bp_desg_htime : bp->bp_desg_fdelay); break; case BSTP_IFSTATE_FORWARDING: DPRINTF(bp, "state changed to FORWARDING\n"); bstp_timer_stop(&bp->bp_forward_delay_timer); /* Record that we enabled forwarding */ bp->bp_forward_transitions++; break; } } void bstp_set_port_role(struct bstp_port *bp, int role) { struct bstp_state *bs = bp->bp_bs; if (bp->bp_role == role) return; /* perform pre-change tasks */ switch (bp->bp_role) { case BSTP_ROLE_DISABLED: bstp_timer_start(&bp->bp_forward_delay_timer, bp->bp_desg_max_age); break; case BSTP_ROLE_BACKUP: bstp_timer_start(&bp->bp_recent_backup_timer, bp->bp_desg_htime * 2); /* FALLTHROUGH */ case BSTP_ROLE_ALTERNATE: bstp_timer_start(&bp->bp_forward_delay_timer, bp->bp_desg_fdelay); bp->bp_sync = 0; bp->bp_synced = 1; bp->bp_reroot = 0; break; case BSTP_ROLE_ROOT: bstp_timer_start(&bp->bp_recent_root_timer, BSTP_DEFAULT_FORWARD_DELAY); break; } bp->bp_role = role; /* clear values not carried between roles */ bp->bp_proposing = 0; bs->bs_allsynced = 0; /* initialise the new role */ switch (bp->bp_role) { case BSTP_ROLE_DISABLED: case BSTP_ROLE_ALTERNATE: case BSTP_ROLE_BACKUP: DPRINTF(bp, "role -> ALT/BACK/DISABLED\n"); bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); bstp_timer_stop(&bp->bp_recent_root_timer); bstp_timer_latch(&bp->bp_forward_delay_timer); bp->bp_sync = 0; bp->bp_synced = 1; bp->bp_reroot = 0; break; case BSTP_ROLE_ROOT: DPRINTF(bp, "role -> ROOT\n"); bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); bstp_timer_latch(&bp->bp_recent_root_timer); bp->bp_proposing = 0; break; case BSTP_ROLE_DESIGNATED: DPRINTF(bp, "role -> DESIGNATED\n"); bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); bp->bp_agree = 0; break; } /* let the TC state know that the role changed */ bstp_update_tc(bp); } void bstp_set_port_proto(struct bstp_port *bp, int proto) { struct bstp_state *bs = bp->bp_bs; /* supported protocol versions */ switch (proto) { case BSTP_PROTO_STP: /* we can downgrade protocols only */ bstp_timer_stop(&bp->bp_migrate_delay_timer); /* clear unsupported features */ bp->bp_operedge = 0; break; case BSTP_PROTO_RSTP: bstp_timer_start(&bp->bp_migrate_delay_timer, bs->bs_migration_delay); break; default: DPRINTF(bp, "Unsupported STP version %d\n", proto); return; } bp->bp_protover = proto; bp->bp_flags &= ~BSTP_PORT_CANMIGRATE; } void bstp_set_port_tc(struct bstp_port *bp, int state) { struct bstp_state *bs = bp->bp_bs; bp->bp_tcstate = state; /* initialise the new state */ switch (bp->bp_tcstate) { case BSTP_TCSTATE_ACTIVE: DPRINTF(bp, "-> TC_ACTIVE\n"); /* nothing to do */ break; case BSTP_TCSTATE_INACTIVE: bstp_timer_stop(&bp->bp_tc_timer); /* flush routes on the parent bridge */ bp->bp_fdbflush = 1; bstp_notify_rtage(bp, 0); bp->bp_tc_ack = 0; DPRINTF(bp, "-> TC_INACTIVE\n"); break; case BSTP_TCSTATE_LEARNING: bp->bp_rcvdtc = 0; bp->bp_rcvdtcn = 0; bp->bp_rcvdtca = 0; bp->bp_tc_prop = 0; DPRINTF(bp, "-> TC_LEARNING\n"); break; case BSTP_TCSTATE_DETECTED: bstp_set_timer_tc(bp); bstp_set_other_tcprop(bp); /* send out notification */ bp->bp_flags |= BSTP_PORT_NEWINFO; bstp_transmit(bs, bp); getmicrotime(&bs->bs_last_tc_time); DPRINTF(bp, "-> TC_DETECTED\n"); bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ break; case BSTP_TCSTATE_TCN: bstp_set_timer_tc(bp); DPRINTF(bp, "-> TC_TCN\n"); /* FALLTHROUGH */ case BSTP_TCSTATE_TC: bp->bp_rcvdtc = 0; bp->bp_rcvdtcn = 0; if (bp->bp_role == BSTP_ROLE_DESIGNATED) bp->bp_tc_ack = 1; bstp_set_other_tcprop(bp); DPRINTF(bp, "-> TC_TC\n"); bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ break; case BSTP_TCSTATE_PROPAG: /* flush routes on the parent bridge */ bp->bp_fdbflush = 1; bstp_notify_rtage(bp, 0); bp->bp_tc_prop = 0; bstp_set_timer_tc(bp); DPRINTF(bp, "-> TC_PROPAG\n"); bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ break; case BSTP_TCSTATE_ACK: bstp_timer_stop(&bp->bp_tc_timer); bp->bp_rcvdtca = 0; DPRINTF(bp, "-> TC_ACK\n"); bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ break; } } void bstp_set_timer_tc(struct bstp_port *bp) { struct bstp_state *bs = bp->bp_bs; if (bp->bp_tc_timer.active) return; switch (bp->bp_protover) { case BSTP_PROTO_RSTP: bstp_timer_start(&bp->bp_tc_timer, bp->bp_desg_htime + BSTP_TICK_VAL); bp->bp_flags |= BSTP_PORT_NEWINFO; break; case BSTP_PROTO_STP: bstp_timer_start(&bp->bp_tc_timer, bs->bs_root_max_age + bs->bs_root_fdelay); break; } } void bstp_set_timer_msgage(struct bstp_port *bp) { if (bp->bp_port_msg_age + BSTP_MESSAGE_AGE_INCR <= bp->bp_port_max_age) { bstp_timer_start(&bp->bp_message_age_timer, bp->bp_port_htime * 3); } else /* expires immediately */ bstp_timer_start(&bp->bp_message_age_timer, 0); } int bstp_rerooted(struct bstp_state *bs, struct bstp_port *bp) { struct bstp_port *bp2; int rr_set = 0; LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { if (bp2 == bp) continue; if (bp2->bp_recent_root_timer.active) { rr_set = 1; break; } } return (!rr_set); } /* * Calculate the path cost according to the link speed. */ u_int32_t bstp_calc_path_cost(struct bstp_port *bp) { struct ifnet *ifp; u_int32_t path_cost; /* If the priority has been manually set then retain the value */ if (bp->bp_flags & BSTP_PORT_ADMCOST) return bp->bp_path_cost; if ((ifp = if_get(bp->bp_ifindex)) == NULL) { return bp->bp_path_cost; } if (ifp->if_baudrate < 1000) { if_put(ifp); return (BSTP_DEFAULT_PATH_COST); } /* formula from section 17.14, IEEE Std 802.1D-2004 */ path_cost = 20000000000ULL / (ifp->if_baudrate / 1000); if_put(ifp); if (path_cost > BSTP_MAX_PATH_COST) path_cost = BSTP_MAX_PATH_COST; /* STP compat mode only uses 16 bits of the 32 */ if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535) path_cost = 65535; return (path_cost); } void bstp_notify_rtage(struct bstp_port *bp, int pending) { int age = 0; KERNEL_ASSERT_LOCKED(); switch (bp->bp_protover) { case BSTP_PROTO_STP: /* convert to seconds */ age = bp->bp_desg_fdelay / BSTP_TICK_VAL; break; case BSTP_PROTO_RSTP: age = 0; break; } if (bp->bp_active == 1) { struct ifnet *ifp; if ((ifp = if_get(bp->bp_ifindex)) != NULL) bridge_rtagenode(ifp, age); if_put(ifp); } /* flush is complete */ bp->bp_fdbflush = 0; } void bstp_ifstate(void *arg) { struct ifnet *ifp = (struct ifnet *)arg; struct bridge_iflist *bif; struct bstp_port *bp; struct bstp_state *bs; int s; if (ifp->if_type == IFT_BRIDGE) return; s = splnet(); if ((bif = bridge_getbif(ifp)) == NULL) goto done; if ((bif->bif_flags & IFBIF_STP) == 0) goto done; if ((bp = bif->bif_stp) == NULL) goto done; if ((bs = bp->bp_bs) == NULL) goto done; /* update the link state */ bstp_ifupdstatus(bs, bp); bstp_update_state(bs, bp); done: splx(s); } void bstp_ifupdstatus(struct bstp_state *bs, struct bstp_port *bp) { struct ifnet *ifp; if ((ifp = if_get(bp->bp_ifindex)) == NULL) return; bp->bp_path_cost = bstp_calc_path_cost(bp); if ((ifp->if_flags & IFF_UP) && ifp->if_link_state != LINK_STATE_DOWN) { if (bp->bp_flags & BSTP_PORT_AUTOPTP) { /* A full-duplex link is assumed to be ptp */ bp->bp_ptp_link = ifp->if_link_state == LINK_STATE_FULL_DUPLEX ? 1 : 0; } if (bp->bp_infois == BSTP_INFO_DISABLED) bstp_enable_port(bs, bp); } else { if (bp->bp_infois != BSTP_INFO_DISABLED) bstp_disable_port(bs, bp); } if_put(ifp); } void bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp) { bp->bp_infois = BSTP_INFO_AGED; bstp_assign_roles(bs); } void bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp) { bp->bp_infois = BSTP_INFO_DISABLED; bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); bstp_assign_roles(bs); } void bstp_tick(void *arg) { struct bstp_state *bs = (struct bstp_state *)arg; struct ifnet *ifp; struct bstp_port *bp; int s; if ((ifp = if_get(bs->bs_ifindex)) == NULL) return; s = splnet(); if ((ifp->if_flags & IFF_RUNNING) == 0) { splx(s); if_put(ifp); return; } /* slow timer to catch missed link events */ if (bstp_timer_expired(&bs->bs_link_timer)) { LIST_FOREACH(bp, &bs->bs_bplist, bp_next) bstp_ifupdstatus(bs, bp); bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); } LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { /* no events need to happen for these */ bstp_timer_expired(&bp->bp_tc_timer); bstp_timer_expired(&bp->bp_recent_root_timer); bstp_timer_expired(&bp->bp_forward_delay_timer); bstp_timer_expired(&bp->bp_recent_backup_timer); if (bstp_timer_expired(&bp->bp_hello_timer)) bstp_hello_timer_expiry(bs, bp); if (bstp_timer_expired(&bp->bp_message_age_timer)) bstp_message_age_expiry(bs, bp); if (bstp_timer_expired(&bp->bp_migrate_delay_timer)) bstp_migrate_delay_expiry(bs, bp); if (bstp_timer_expired(&bp->bp_edge_delay_timer)) bstp_edge_delay_expiry(bs, bp); /* update the various state machines for the port */ bstp_update_state(bs, bp); if (bp->bp_txcount > 0) bp->bp_txcount--; } if (ifp->if_flags & IFF_RUNNING) timeout_add_sec(&bs->bs_bstptimeout, 1); splx(s); if_put(ifp); } void bstp_timer_start(struct bstp_timer *t, u_int16_t v) { t->value = v; t->active = 1; t->latched = 0; } void bstp_timer_stop(struct bstp_timer *t) { t->value = 0; t->active = 0; t->latched = 0; } void bstp_timer_latch(struct bstp_timer *t) { t->latched = 1; t->active = 1; } int bstp_timer_expired(struct bstp_timer *t) { if (t->active == 0 || t->latched) return (0); t->value -= BSTP_TICK_VAL; if (t->value <= 0) { bstp_timer_stop(t); return (1); } return (0); } void bstp_hello_timer_expiry(struct bstp_state *bs, struct bstp_port *bp) { if ((bp->bp_flags & BSTP_PORT_NEWINFO) || bp->bp_role == BSTP_ROLE_DESIGNATED || (bp->bp_role == BSTP_ROLE_ROOT && bp->bp_tc_timer.active == 1)) { bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime); bp->bp_flags |= BSTP_PORT_NEWINFO; bstp_transmit(bs, bp); } } void bstp_message_age_expiry(struct bstp_state *bs, struct bstp_port *bp) { if (bp->bp_infois == BSTP_INFO_RECEIVED) { bp->bp_infois = BSTP_INFO_AGED; bstp_assign_roles(bs); DPRINTF(bp, "aged info\n"); } } void bstp_migrate_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) { bp->bp_flags |= BSTP_PORT_CANMIGRATE; } void bstp_edge_delay_expiry(struct bstp_state *bs, struct bstp_port *bp) { if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) && bp->bp_protover == BSTP_PROTO_RSTP && bp->bp_proposing && bp->bp_role == BSTP_ROLE_DESIGNATED) bp->bp_operedge = 1; } int bstp_addr_cmp(const u_int8_t *a, const u_int8_t *b) { int i, d; for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { d = ((int)a[i]) - ((int)b[i]); } return (d); } /* * compare the bridge address component of the bridgeid */ int bstp_same_bridgeid(u_int64_t id1, u_int64_t id2) { u_char addr1[ETHER_ADDR_LEN]; u_char addr2[ETHER_ADDR_LEN]; PV2ADDR(id1, addr1); PV2ADDR(id2, addr2); if (bstp_addr_cmp(addr1, addr2) == 0) return (1); return (0); } void bstp_initialization(struct bstp_state *bs) { struct bstp_port *bp; struct ifnet *mif = NULL; u_char *e_addr; /* * Search through the Ethernet interfaces and find the one * with the lowest value. * Make sure we take the address from an interface that is * part of the bridge to make sure two bridges on the system * will not use the same one. 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. */ LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { struct ifnet *ifp; if (mif == NULL) { mif = if_get(bp->bp_ifindex); continue; } if ((ifp = if_get(bp->bp_ifindex)) == NULL) continue; if (bstp_addr_cmp(LLADDR(ifp->if_sadl), LLADDR(mif->if_sadl)) < 0) { if_put(mif); mif = ifp; continue; } if_put(ifp); } if (mif == NULL) { bstp_stop(bs); bstp_reset(bs); return; } e_addr = LLADDR(mif->if_sadl); if_put(mif); bs->bs_bridge_pv.pv_dbridge_id = (((u_int64_t)bs->bs_bridge_priority) << 48) | (((u_int64_t)e_addr[0]) << 40) | (((u_int64_t)e_addr[1]) << 32) | (((u_int64_t)e_addr[2]) << 24) | (((u_int64_t)e_addr[3]) << 16) | (((u_int64_t)e_addr[4]) << 8) | (((u_int64_t)e_addr[5])); bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id; bs->bs_bridge_pv.pv_cost = 0; bs->bs_bridge_pv.pv_dport_id = 0; bs->bs_bridge_pv.pv_port_id = 0; if (!timeout_initialized(&bs->bs_bstptimeout)) timeout_set(&bs->bs_bstptimeout, bstp_tick, bs); if (!timeout_pending(&bs->bs_bstptimeout)) timeout_add_sec(&bs->bs_bstptimeout, 1); LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { bp->bp_port_id = (bp->bp_priority << 8) | (bp->bp_ifindex & 0xfff); bstp_ifupdstatus(bs, bp); } bstp_assign_roles(bs); bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); } struct bstp_state * bstp_create(void) { struct bstp_state *bs; bs = malloc(sizeof(*bs), M_DEVBUF, M_WAITOK|M_ZERO); LIST_INIT(&bs->bs_bplist); bs->bs_bridge_max_age = BSTP_DEFAULT_MAX_AGE; bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; bs->bs_bridge_fdelay = BSTP_DEFAULT_FORWARD_DELAY; bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; bs->bs_hold_time = BSTP_DEFAULT_HOLD_TIME; bs->bs_migration_delay = BSTP_DEFAULT_MIGRATE_DELAY; bs->bs_txholdcount = BSTP_DEFAULT_HOLD_COUNT; bs->bs_protover = BSTP_PROTO_RSTP; /* STP instead of RSTP? */ getmicrotime(&bs->bs_last_tc_time); return (bs); } void bstp_destroy(struct bstp_state *bs) { if (bs == NULL) return; if (!LIST_EMPTY(&bs->bs_bplist)) panic("bstp still active"); free(bs, M_DEVBUF, sizeof *bs); } void bstp_enable(struct bstp_state *bs, unsigned int ifindex) { bs->bs_ifindex = ifindex; bstp_initialization(bs); } void bstp_disable(struct bstp_state *bs) { if (timeout_initialized(&bs->bs_bstptimeout)) timeout_del(&bs->bs_bstptimeout); bs->bs_ifindex = 0; } void bstp_stop(struct bstp_state *bs) { struct bstp_port *bp; LIST_FOREACH(bp, &bs->bs_bplist, bp_next) bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); if (timeout_initialized(&bs->bs_bstptimeout)) timeout_del(&bs->bs_bstptimeout); } struct bstp_port * bstp_add(struct bstp_state *bs, struct ifnet *ifp) { struct bstp_port *bp; switch (ifp->if_type) { case IFT_ETHER: /* These can do spanning tree. */ break; default: /* Nothing else can. */ return (NULL); } bp = malloc(sizeof(*bp), M_DEVBUF, M_NOWAIT|M_ZERO); if (bp == NULL) return (NULL); bp->bp_ifindex = ifp->if_index; bp->bp_bs = bs; bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY; bp->bp_txcount = 0; /* Init state */ bp->bp_infois = BSTP_INFO_DISABLED; bp->bp_flags = BSTP_PORT_AUTOEDGE | BSTP_PORT_AUTOPTP; bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING); bstp_set_port_proto(bp, bs->bs_protover); bstp_set_port_role(bp, BSTP_ROLE_DISABLED); bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); bp->bp_path_cost = bstp_calc_path_cost(bp); LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next); bp->bp_active = 1; bp->bp_flags |= BSTP_PORT_NEWINFO; bstp_initialization(bs); bstp_update_roles(bs, bp); /* Register callback for physical link state changes */ task_set(&bp->bp_ltask, bstp_ifstate, ifp); if_linkstatehook_add(ifp, &bp->bp_ltask); return (bp); } void bstp_delete(struct bstp_port *bp) { struct bstp_state *bs = bp->bp_bs; struct ifnet *ifp; if (!bp->bp_active) panic("not a bstp member"); if ((ifp = if_get(bp->bp_ifindex)) != NULL) if_linkstatehook_del(ifp, &bp->bp_ltask); if_put(ifp); LIST_REMOVE(bp, bp_next); free(bp, M_DEVBUF, sizeof *bp); bstp_initialization(bs); } u_int8_t bstp_getstate(struct bstp_state *bs, struct bstp_port *bp) { u_int8_t state = bp->bp_state; if (bs->bs_protover != BSTP_PROTO_STP) return (state); /* * Translate RSTP roles and states to STP port states * (IEEE Std 802.1D-2004 Table 17-1). */ if (bp->bp_role == BSTP_ROLE_DISABLED) state = BSTP_IFSTATE_DISABLED; else if (bp->bp_role == BSTP_ROLE_ALTERNATE || bp->bp_role == BSTP_ROLE_BACKUP) state = BSTP_IFSTATE_BLOCKING; else if (state == BSTP_IFSTATE_DISCARDING) state = BSTP_IFSTATE_LISTENING; return (state); } void bstp_ifsflags(struct bstp_port *bp, u_int flags) { struct bstp_state *bs; if ((flags & IFBIF_STP) == 0) return; bs = bp->bp_bs; /* * Set edge status */ if (flags & IFBIF_BSTP_AUTOEDGE) { if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) == 0) { bp->bp_flags |= BSTP_PORT_AUTOEDGE; /* we may be able to transition straight to edge */ if (bp->bp_edge_delay_timer.active == 0) bstp_edge_delay_expiry(bs, bp); } } else bp->bp_flags &= ~BSTP_PORT_AUTOEDGE; if (flags & IFBIF_BSTP_EDGE) bp->bp_operedge = 1; else bp->bp_operedge = 0; /* * Set point to point status */ if (flags & IFBIF_BSTP_AUTOPTP) { if ((bp->bp_flags & BSTP_PORT_AUTOPTP) == 0) { bp->bp_flags |= BSTP_PORT_AUTOPTP; bstp_ifupdstatus(bs, bp); } } else bp->bp_flags &= ~BSTP_PORT_AUTOPTP; if (flags & IFBIF_BSTP_PTP) bp->bp_ptp_link = 1; else bp->bp_ptp_link = 0; } int bstp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) { struct bridge_softc *sc = (struct bridge_softc *)ifp->if_softc; struct bstp_state *bs = sc->sc_stp; struct ifbrparam *ifbp = (struct ifbrparam *)data; struct ifbreq *ifbr = (struct ifbreq *)data; struct bridge_iflist *bif; struct bstp_port *bp; int r = 0, err = 0, val; switch (cmd) { case SIOCBRDGSIFPRIO: case SIOCBRDGSIFCOST: err = bridge_findbif(sc, ifbr->ifbr_ifsname, &bif); if (err != 0) break; if ((bif->bif_flags & IFBIF_STP) == 0) { err = EINVAL; break; } bp = bif->bif_stp; break; default: break; } if (err) return (err); switch (cmd) { case SIOCBRDGGPRI: ifbp->ifbrp_prio = bs->bs_bridge_priority; break; case SIOCBRDGSPRI: val = ifbp->ifbrp_prio; if (val < 0 || val > BSTP_MAX_PRIORITY) { err = EINVAL; break; } /* Limit to steps of 4096 */ val -= val % 4096; bs->bs_bridge_priority = val; r = 1; break; case SIOCBRDGGMA: ifbp->ifbrp_maxage = bs->bs_bridge_max_age >> 8; break; case SIOCBRDGSMA: val = ifbp->ifbrp_maxage; /* convert seconds to ticks */ val *= BSTP_TICK_VAL; if (val < BSTP_MIN_MAX_AGE || val > BSTP_MAX_MAX_AGE) { err = EINVAL; break; } bs->bs_bridge_max_age = val; r = 1; break; case SIOCBRDGGHT: ifbp->ifbrp_hellotime = bs->bs_bridge_htime >> 8; break; case SIOCBRDGSHT: val = ifbp->ifbrp_hellotime; /* convert seconds to ticks */ val *= BSTP_TICK_VAL; /* value can only be changed in legacy stp mode */ if (bs->bs_protover != BSTP_PROTO_STP) { err = EPERM; break; } if (val < BSTP_MIN_HELLO_TIME || val > BSTP_MAX_HELLO_TIME) { err = EINVAL; break; } bs->bs_bridge_htime = val; r = 1; break; case SIOCBRDGGFD: ifbp->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; break; case SIOCBRDGSFD: val = ifbp->ifbrp_fwddelay; /* convert seconds to ticks */ val *= BSTP_TICK_VAL; if (val < BSTP_MIN_FORWARD_DELAY || val > BSTP_MAX_FORWARD_DELAY) { err = EINVAL; break; } bs->bs_bridge_fdelay = val; r = 1; break; case SIOCBRDGSTXHC: val = ifbp->ifbrp_txhc; if (val < BSTP_MIN_HOLD_COUNT || val > BSTP_MAX_HOLD_COUNT) { err = EINVAL; break; } bs->bs_txholdcount = val; LIST_FOREACH(bp, &bs->bs_bplist, bp_next) bp->bp_txcount = 0; break; case SIOCBRDGSIFPRIO: val = ifbr->ifbr_priority; if (val < 0 || val > BSTP_MAX_PORT_PRIORITY) return (EINVAL); /* Limit to steps of 16 */ val -= val % 16; bp->bp_priority = val; r = 1; break; case SIOCBRDGSIFCOST: val = ifbr->ifbr_path_cost; if (val > BSTP_MAX_PATH_COST) { err = EINVAL; break; } if (val == 0) { /* use auto */ bp->bp_flags &= ~BSTP_PORT_ADMCOST; bp->bp_path_cost = bstp_calc_path_cost(bp); } else { bp->bp_path_cost = val; bp->bp_flags |= BSTP_PORT_ADMCOST; } r = 1; break; case SIOCBRDGSPROTO: val = ifbp->ifbrp_proto; /* Supported protocol versions */ switch (val) { case BSTP_PROTO_STP: case BSTP_PROTO_RSTP: bs->bs_protover = val; bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME; LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { /* reinit state */ bp->bp_infois = BSTP_INFO_DISABLED; bp->bp_txcount = 0; bstp_set_port_proto(bp, bs->bs_protover); bstp_set_port_role(bp, BSTP_ROLE_DISABLED); bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE); bstp_timer_stop(&bp->bp_recent_backup_timer); } r = 1; break; default: err = EINVAL; } break; default: break; } if (r) bstp_initialization(bs); return (err); }