diff options
Diffstat (limited to 'sys/net/bridgestp.c')
| -rw-r--r-- | sys/net/bridgestp.c | 2700 |
1 files changed, 1879 insertions, 821 deletions
diff --git a/sys/net/bridgestp.c b/sys/net/bridgestp.c index a621f86c1c4..a43f5143adc 100644 --- a/sys/net/bridgestp.c +++ b/sys/net/bridgestp.c @@ -1,7 +1,8 @@ -/* $OpenBSD: bridgestp.c,v 1.22 2006/11/24 11:50:32 reyk Exp $ */ +/* $OpenBSD: bridgestp.c,v 1.23 2006/12/03 13:41:19 reyk 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 @@ -28,10 +29,13 @@ /* * Implementation of the spanning tree protocol as defined in - * ISO/IEC Final DIS 15802-3 (IEEE P802.1D/D17), May 25, 1998. - * (In English: IEEE 802.1D, Draft 17, 1998) + * ISO/IEC 802.1D-2004, June 9, 2004. */ +#if 0 +__FBSDID("$FreeBSD: /repoman/r/ncvs/src/sys/net/bridgestp.c,v 1.25 2006/11/03 03:34:04 thompsa Exp $"); +#endif + #include "bridge.h" #if NBRIDGE > 0 @@ -47,6 +51,7 @@ #include <net/if.h> #include <net/if_types.h> +#include <net/if_dl.h> #include <net/if_llc.h> #include <net/if_media.h> #include <net/route.h> @@ -66,16 +71,116 @@ #include <net/if_bridge.h> +/* 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 */ -/* BPDU flags */ -#define BSTP_FLAG_TC 0x01 /* Topology change */ -#define BSTP_FLAG_TCA 0x80 /* Topology change ack */ +#define BSTP_INFO_RECIEVED 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(fmt, arg...) printf("bstp: " fmt, ##arg) +#else +#define DPRINTF(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 /* * Because BPDU's do not make nicely aligned structures, two different @@ -108,8 +213,12 @@ struct bstp_cbpdu { 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 */ @@ -120,283 +229,155 @@ struct bstp_tbpdu { u_int8_t tbu_bpdutype; /* message type */ } __packed; -u_int8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; - -void bstp_initialization(struct bridge_softc *); -void bstp_stop(struct bridge_softc *); -void bstp_initialize_port(struct bridge_softc *, struct bridge_iflist *); -void bstp_ifupdstatus(struct bridge_softc *, struct bridge_iflist *); -void bstp_enable_port(struct bridge_softc *, struct bridge_iflist *); -void bstp_disable_port(struct bridge_softc *, struct bridge_iflist *); -void bstp_enable_change_detection(struct bridge_iflist *); -void bstp_disable_change_detection(struct bridge_iflist *); -int bstp_root_bridge(struct bridge_softc *sc); -int bstp_supersedes_port_info(struct bridge_softc *, struct bridge_iflist *, - struct bstp_config_unit *); -int bstp_designated_port(struct bridge_softc *, struct bridge_iflist *); -int bstp_designated_for_some_port(struct bridge_softc *); -void bstp_transmit_config(struct bridge_softc *, struct bridge_iflist *); -void bstp_transmit_tcn(struct bridge_softc *); -struct mbuf *bstp_input(struct bridge_softc *, struct ifnet *, - struct ether_header *, struct mbuf *); -void bstp_received_config_bpdu(struct bridge_softc *, struct bridge_iflist *, - struct bstp_config_unit *); -void bstp_received_tcn_bpdu(struct bridge_softc *, struct bridge_iflist *, - struct bstp_tcn_unit *); -void bstp_record_config_information(struct bridge_softc *, - struct bridge_iflist *, struct bstp_config_unit *); -void bstp_record_config_timeout_values(struct bridge_softc *, - struct bstp_config_unit *); -void bstp_config_bpdu_generation(struct bridge_softc *); -void bstp_send_config_bpdu(struct bridge_iflist *, struct bstp_config_unit *); -void bstp_configuration_update(struct bridge_softc *); -void bstp_root_selection(struct bridge_softc *); -void bstp_designated_port_selection(struct bridge_softc *); -void bstp_become_designated_port(struct bridge_softc *, struct bridge_iflist *); -void bstp_port_state_selection(struct bridge_softc *); -void bstp_make_forwarding(struct bridge_softc *, struct bridge_iflist *); -void bstp_make_blocking(struct bridge_softc *, struct bridge_iflist *); -void bstp_set_port_state(struct bridge_iflist *, u_int8_t); -void bstp_set_bridge_priority(struct bridge_softc *, u_int64_t); -void bstp_set_port_priority(struct bridge_softc *, struct bridge_iflist *, - u_int16_t); -void bstp_set_path_cost(struct bridge_softc *, struct bridge_iflist *, - u_int32_t); -void bstp_topology_change_detection(struct bridge_softc *); -void bstp_topology_change_acknowledged(struct bridge_softc *); -void bstp_acknowledge_topology_change(struct bridge_softc *, - struct bridge_iflist *); - -void bstp_tick(void *); -void bstp_timer_start(struct bridge_timer *, u_int16_t); -void bstp_timer_stop(struct bridge_timer *); -int bstp_timer_expired(struct bridge_timer *, u_int16_t); - -void bstp_hold_timer_expiry(struct bridge_softc *, struct bridge_iflist *); -void bstp_message_age_timer_expiry(struct bridge_softc *, - struct bridge_iflist *); -void bstp_forward_delay_timer_expiry(struct bridge_softc *, - struct bridge_iflist *); -void bstp_topology_change_timer_expiry(struct bridge_softc *); -void bstp_tcn_timer_expiry(struct bridge_softc *); -void bstp_hello_timer_expiry(struct bridge_softc *); +const u_int8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; + +LIST_HEAD(, bstp_state) bstp_list; + +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 *); +int bstp_rerooted(struct bstp_state *, struct bstp_port *); +u_int32_t bstp_calc_path_cost(struct bstp_port *); +void bstp_notify_rtage(void *, 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_config(sc, bif) - struct bridge_softc *sc; - struct bridge_iflist *bif; +bstp_attach(int n) { - if (bif->bif_hold_timer.active) { - bif->bif_config_pending = 1; - return; - } - - bif->bif_config_bpdu.cu_message_type = BSTP_MSGTYPE_CFG; - bif->bif_config_bpdu.cu_rootid = sc->sc_designated_root; - bif->bif_config_bpdu.cu_root_path_cost = sc->sc_root_path_cost; - bif->bif_config_bpdu.cu_bridge_id = sc->sc_bridge_id; - bif->bif_config_bpdu.cu_port_id = bif->bif_port_id; - - if (bstp_root_bridge(sc)) - bif->bif_config_bpdu.cu_message_age = 0; - else - bif->bif_config_bpdu.cu_message_age = - sc->sc_root_port->bif_message_age_timer.value + - BSTP_MESSAGE_AGE_INCR; - - bif->bif_config_bpdu.cu_max_age = sc->sc_max_age; - bif->bif_config_bpdu.cu_hello_time = sc->sc_hello_time; - bif->bif_config_bpdu.cu_forward_delay = sc->sc_forward_delay; - bif->bif_config_bpdu.cu_topology_change_acknowledgment - = bif->bif_topology_change_acknowledge; - bif->bif_config_bpdu.cu_topology_change = sc->sc_topology_change; - - if (bif->bif_config_bpdu.cu_message_age < sc->sc_max_age) { - bif->bif_topology_change_acknowledge = 0; - bif->bif_config_pending = 0; - bstp_send_config_bpdu(bif, &bif->bif_config_bpdu); - bstp_timer_start(&bif->bif_hold_timer, 0); - } + LIST_INIT(&bstp_list); } void -bstp_send_config_bpdu(bif, cu) - struct bridge_iflist *bif; - struct bstp_config_unit *cu; +bstp_transmit(struct bstp_state *bs, struct bstp_port *bp) { - struct arpcom *arp; - struct ifnet *ifp; - struct mbuf *m; - struct ether_header eh; - struct bstp_cbpdu bpdu; - int s, error; - - s = splnet(); - ifp = bif->ifp; - arp = (struct arpcom *)ifp; - - if ((ifp->if_flags & IFF_RUNNING) == 0) { - splx(s); - return; - } -#ifdef ALTQ - if (!ALTQ_IS_ENABLED(&ifp->if_snd)) -#endif - if (IF_QFULL(&ifp->if_snd)) { - splx(s); + if ((bs->bs_ifflags & IFF_RUNNING) == 0 || bp == NULL) return; - } - MGETHDR(m, M_DONTWAIT, MT_DATA); - if (m == NULL) { - splx(s); + /* + * 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; } - m->m_pkthdr.rcvif = ifp; - m->m_pkthdr.len = sizeof(eh) + sizeof(bpdu); - m->m_len = m->m_pkthdr.len; - - bpdu.cbu_ssap = bpdu.cbu_dsap = LLC_8021D_LSAP; - bpdu.cbu_ctl = LLC_UI; - bpdu.cbu_protoid = htons(0); - bpdu.cbu_protover = 0; - bpdu.cbu_bpdutype = cu->cu_message_type; - bpdu.cbu_flags = (cu->cu_topology_change ? BSTP_FLAG_TC : 0) | - (cu->cu_topology_change_acknowledgment ? BSTP_FLAG_TCA : 0); - - bpdu.cbu_rootpri = htons(cu->cu_rootid >> 48); - bpdu.cbu_rootaddr[0] = cu->cu_rootid >> 40; - bpdu.cbu_rootaddr[1] = cu->cu_rootid >> 32; - bpdu.cbu_rootaddr[2] = cu->cu_rootid >> 24; - bpdu.cbu_rootaddr[3] = cu->cu_rootid >> 16; - bpdu.cbu_rootaddr[4] = cu->cu_rootid >> 8; - bpdu.cbu_rootaddr[5] = cu->cu_rootid >> 0; - - bpdu.cbu_rootpathcost = htonl(cu->cu_root_path_cost); - - bpdu.cbu_bridgepri = htons(cu->cu_bridge_id >> 48); - bpdu.cbu_bridgeaddr[0] = cu->cu_bridge_id >> 40; - bpdu.cbu_bridgeaddr[1] = cu->cu_bridge_id >> 32; - bpdu.cbu_bridgeaddr[2] = cu->cu_bridge_id >> 24; - bpdu.cbu_bridgeaddr[3] = cu->cu_bridge_id >> 16; - bpdu.cbu_bridgeaddr[4] = cu->cu_bridge_id >> 8; - bpdu.cbu_bridgeaddr[5] = cu->cu_bridge_id >> 0; - - bpdu.cbu_portid = htons(cu->cu_port_id); - bpdu.cbu_messageage = htons(cu->cu_message_age); - bpdu.cbu_maxage = htons(cu->cu_max_age); - bpdu.cbu_hellotime = htons(cu->cu_hello_time); - bpdu.cbu_forwarddelay = htons(cu->cu_forward_delay); - - bcopy(arp->ac_enaddr, eh.ether_shost, ETHER_ADDR_LEN); - bcopy(bstp_etheraddr, eh.ether_dhost, ETHER_ADDR_LEN); - eh.ether_type = htons(sizeof(bpdu)); - - bcopy(&eh, m->m_data, sizeof(eh)); - bcopy(&bpdu, m->m_data + sizeof(eh), sizeof(bpdu)); + if (bp->bp_txcount > bs->bs_txholdcount) + /* Ran out of karma */ + return; - IFQ_ENQUEUE(&ifp->if_snd, m, NULL, error); - if (error == 0 && (ifp->if_flags & IFF_OACTIVE) == 0) - (*ifp->if_start)(ifp); - splx(s); -} + 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; -int -bstp_root_bridge(sc) - struct bridge_softc *sc; -{ - return (sc->sc_designated_root == sc->sc_bridge_id); + 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; } -int -bstp_supersedes_port_info(sc, bif, cu) - struct bridge_softc *sc; - struct bridge_iflist *bif; - struct bstp_config_unit *cu; +void +bstp_transmit_bpdu(struct bstp_state *bs, struct bstp_port *bp) { - if (cu->cu_rootid < bif->bif_designated_root) - return (1); - if (cu->cu_rootid > bif->bif_designated_root) - return (0); - - if (cu->cu_root_path_cost < bif->bif_designated_cost) - return (1); - if (cu->cu_root_path_cost > bif->bif_designated_cost) - return (0); + struct bstp_cbpdu bpdu; - if (cu->cu_bridge_id < bif->bif_designated_bridge) - return (1); - if (cu->cu_bridge_id > bif->bif_designated_bridge) - return (0); + bpdu.cbu_rootpri = htons(bp->bp_desg_pv.pv_root_id >> 48); + PV2ADDR(bp->bp_desg_pv.pv_root_id, bpdu.cbu_rootaddr); - if (sc->sc_bridge_id != cu->cu_bridge_id) - return (1); - if (cu->cu_port_id <= bif->bif_designated_port) - return (1); - return (0); -} + bpdu.cbu_rootpathcost = htonl(bp->bp_desg_pv.pv_cost); -void -bstp_record_config_information(sc, bif, cu) - struct bridge_softc *sc; - struct bridge_iflist *bif; - struct bstp_config_unit *cu; -{ - bif->bif_designated_root = cu->cu_rootid; - bif->bif_designated_cost = cu->cu_root_path_cost; - bif->bif_designated_bridge = cu->cu_bridge_id; - bif->bif_designated_port = cu->cu_port_id; - bstp_timer_start(&bif->bif_message_age_timer, cu->cu_message_age); -} + bpdu.cbu_bridgepri = htons(bp->bp_desg_pv.pv_dbridge_id >> 48); + PV2ADDR(bp->bp_desg_pv.pv_dbridge_id, bpdu.cbu_bridgeaddr); -void -bstp_record_config_timeout_values(sc, config) - struct bridge_softc *sc; - struct bstp_config_unit *config; -{ - sc->sc_max_age = config->cu_max_age; - sc->sc_hello_time = config->cu_hello_time; - sc->sc_forward_delay = config->cu_forward_delay; - sc->sc_topology_change = config->cu_topology_change; -} + 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); -void -bstp_config_bpdu_generation(sc) - struct bridge_softc *sc; -{ - struct bridge_iflist *bif; + bpdu.cbu_flags = bstp_pdu_flags(bp); - LIST_FOREACH(bif, &sc->sc_iflist, next) { - if (!(bif->bif_flags & IFBIF_STP)) - continue; - if (bstp_designated_port(sc, bif) && - (bif->bif_state != BSTP_IFSTATE_DISABLED)) - bstp_transmit_config(sc, bif); + 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; } -} -int -bstp_designated_port(sc, bif) - struct bridge_softc *sc; - struct bridge_iflist *bif; -{ - return ((bif->bif_designated_bridge == sc->sc_bridge_id) - && (bif->bif_designated_port == bif->bif_port_id)); + bstp_send_bpdu(bs, bp, &bpdu); } void -bstp_transmit_tcn(sc) - struct bridge_softc *sc; +bstp_transmit_tcn(struct bstp_state *bs, struct bstp_port *bp) { struct bstp_tbpdu bpdu; - struct bridge_iflist *bif = sc->sc_root_port; - struct ifnet *ifp = bif->ifp; - struct arpcom *arp = (struct arpcom *)ifp; + struct ifnet *ifp = bp->bp_ifp; struct ether_header *eh; struct mbuf *m; - int s, error; + int s,error; - if ((ifp->if_flags & IFF_RUNNING) == 0) + if (ifp == NULL || (ifp->if_flags & IFF_RUNNING) == 0) return; MGETHDR(m, M_DONTWAIT, MT_DATA); @@ -407,7 +388,7 @@ bstp_transmit_tcn(sc) m->m_len = m->m_pkthdr.len; eh = mtod(m, struct ether_header *); - bcopy(arp->ac_enaddr, eh->ether_shost, ETHER_ADDR_LEN); + 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)); @@ -416,237 +397,209 @@ bstp_transmit_tcn(sc) bpdu.tbu_protoid = 0; bpdu.tbu_protover = 0; bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN; - bcopy(&bpdu, m->m_data + sizeof(*eh), sizeof(bpdu)); + bcopy(&bpdu, mtod(m, caddr_t) + sizeof(*eh), sizeof(bpdu)); s = splnet(); + bp->bp_txcount++; IFQ_ENQUEUE(&ifp->if_snd, m, NULL, error); if (error == 0 && (ifp->if_flags & IFF_OACTIVE) == 0) (*ifp->if_start)(ifp); - m = NULL; splx(s); } void -bstp_configuration_update(sc) - struct bridge_softc *sc; +bstp_decode_bpdu(struct bstp_port *bp, struct bstp_cbpdu *cpdu, + struct bstp_config_unit *cu) { - bstp_root_selection(sc); - bstp_designated_port_selection(sc); + 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_root_selection(sc) - struct bridge_softc *sc; +bstp_send_bpdu(struct bstp_state *bs, struct bstp_port *bp, + struct bstp_cbpdu *bpdu) { - struct bridge_iflist *root_port = NULL, *bif; + struct ifnet *ifp = bp->bp_ifp; + struct mbuf *m; + struct ether_header *eh; + int s, error; - LIST_FOREACH(bif, &sc->sc_iflist, next) { - if (!(bif->bif_flags & IFBIF_STP)) - continue; - if (bstp_designated_port(sc, bif)) - continue; - if (bif->bif_state == BSTP_IFSTATE_DISABLED) - continue; - if (bif->bif_designated_root >= sc->sc_bridge_id) - continue; - if (root_port == NULL) - goto set_port; + s = splnet(); + if (ifp == NULL || (ifp->if_flags & IFF_RUNNING) == 0) + goto done; - if (bif->bif_designated_root < root_port->bif_designated_root) - goto set_port; - if (bif->bif_designated_root > root_port->bif_designated_root) - continue; +#ifdef ALTQ + if (!ALTQ_IS_ENABLED(&ifp->if_snd)) +#endif + if (IF_QFULL(&ifp->if_snd)) + goto done; - if ((bif->bif_designated_cost + bif->bif_path_cost) < - (root_port->bif_designated_cost + root_port->bif_path_cost)) - goto set_port; - if ((bif->bif_designated_cost + bif->bif_path_cost) > - (root_port->bif_designated_cost + root_port->bif_path_cost)) - continue; + MGETHDR(m, M_DONTWAIT, MT_DATA); + if (m == NULL) + goto done; - if (bif->bif_designated_bridge < root_port->bif_designated_bridge) - goto set_port; - if (bif->bif_designated_bridge > root_port->bif_designated_bridge) - continue; + eh = mtod(m, struct ether_header *); - if (bif->bif_designated_port < root_port->bif_designated_port) - goto set_port; - if (bif->bif_designated_port > root_port->bif_designated_port) - continue; + bpdu->cbu_ssap = bpdu->cbu_dsap = LLC_8021D_LSAP; + bpdu->cbu_ctl = LLC_UI; + bpdu->cbu_protoid = htons(BSTP_PROTO_ID); - if (bif->bif_port_id >= root_port->bif_port_id) - continue; -set_port: - root_port = bif; - } + memcpy(eh->ether_shost, LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); + memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); - sc->sc_root_port = root_port; - if (root_port == NULL) { - sc->sc_designated_root = sc->sc_bridge_id; - sc->sc_root_path_cost = 0; - } else { - sc->sc_designated_root = root_port->bif_designated_root; - sc->sc_root_path_cost = root_port->bif_designated_cost + - root_port->bif_path_cost; + 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.rcvif = ifp; + m->m_len = m->m_pkthdr.len; + + bp->bp_txcount++; + IFQ_ENQUEUE(&ifp->if_snd, m, NULL, error); + if (error == 0 && (ifp->if_flags & IFF_OACTIVE) == 0) + (*ifp->if_start)(ifp); + done: + splx(s); } -void -bstp_designated_port_selection(sc) - struct bridge_softc *sc; +int +bstp_pdu_flags(struct bstp_port *bp) { - struct bridge_iflist *bif; - - LIST_FOREACH(bif, &sc->sc_iflist, next) { - if (!(bif->bif_flags & IFBIF_STP)) - continue; - if (bstp_designated_port(sc, bif)) - goto designated; - if (bif->bif_designated_root != sc->sc_designated_root) - goto designated; - - if (sc->sc_root_path_cost < bif->bif_designated_cost) - goto designated; - if (sc->sc_root_path_cost > bif->bif_designated_cost) - continue; - - if (sc->sc_bridge_id < bif->bif_designated_bridge) - goto designated; - if (sc->sc_bridge_id > bif->bif_designated_bridge) - continue; + int flags = 0; - if (bif->bif_port_id > bif->bif_designated_port) - continue; -designated: - bstp_become_designated_port(sc, bif); - } -} + if (bp->bp_proposing && bp->bp_state != BSTP_IFSTATE_FORWARDING) + flags |= BSTP_PDU_F_P; -void -bstp_become_designated_port(sc, bif) - struct bridge_softc *sc; - struct bridge_iflist *bif; -{ - bif->bif_designated_root = sc->sc_designated_root; - bif->bif_designated_cost = sc->sc_root_path_cost; - bif->bif_designated_bridge = sc->sc_bridge_id; - bif->bif_designated_port = bif->bif_port_id; -} + if (bp->bp_agree) + flags |= BSTP_PDU_F_A; -void -bstp_port_state_selection(sc) - struct bridge_softc *sc; -{ - struct bridge_iflist *bif; + if (bp->bp_tc_timer.active) + flags |= BSTP_PDU_F_TC; - LIST_FOREACH(bif, &sc->sc_iflist, next) { - if (!(bif->bif_flags & IFBIF_STP)) - continue; - if (bif == sc->sc_root_port) { - bif->bif_config_pending = 0; - bif->bif_topology_change_acknowledge = 0; - bstp_make_forwarding(sc, bif); - } else if (bstp_designated_port(sc, bif)) { - bstp_timer_stop(&bif->bif_message_age_timer); - bstp_make_forwarding(sc, bif); - } else { - bif->bif_config_pending = 0; - bif->bif_topology_change_acknowledge = 0; - bstp_make_blocking(sc, bif); - } - } -} + if (bp->bp_tc_ack) + flags |= BSTP_PDU_F_TCA; -void -bstp_make_forwarding(sc, bif) - struct bridge_softc *sc; - struct bridge_iflist *bif; -{ - if (bif->bif_state == BSTP_IFSTATE_BLOCKING) { - bstp_set_port_state(bif, BSTP_IFSTATE_LISTENING); - bstp_timer_start(&bif->bif_forward_delay_timer, 0); + 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; } -} -void -bstp_make_blocking(sc, bif) - struct bridge_softc *sc; - struct bridge_iflist *bif; -{ - if ((bif->bif_state != BSTP_IFSTATE_DISABLED) && - (bif->bif_state != BSTP_IFSTATE_BLOCKING)) { - if ((bif->bif_state == BSTP_IFSTATE_FORWARDING) || - (bif->bif_state == BSTP_IFSTATE_LEARNING)) { - if (bif->bif_change_detection_enabled) { - bstp_topology_change_detection(sc); - } - bridge_rtdelete(sc, bif->ifp, 1); - } - bstp_set_port_state(bif, BSTP_IFSTATE_BLOCKING); - bstp_timer_stop(&bif->bif_forward_delay_timer); + 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; } -} -void -bstp_set_port_state(bif, state) - struct bridge_iflist *bif; - u_int8_t state; -{ - bif->bif_state = state; -} - -void -bstp_topology_change_detection(sc) - struct bridge_softc *sc; -{ - if (bstp_root_bridge(sc)) { - sc->sc_topology_change = 1; - bstp_timer_start(&sc->sc_topology_change_timer, 0); - } else if (!sc->sc_topology_change_detected) { - bstp_transmit_tcn(sc); - bstp_timer_start(&sc->sc_tcn_timer, 0); + /* 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; } - sc->sc_topology_change_detected = 1; -} - -void -bstp_topology_change_acknowledged(sc) - struct bridge_softc *sc; -{ - sc->sc_topology_change_detected = 0; - bstp_timer_stop(&sc->sc_tcn_timer); -} - -void -bstp_acknowledge_topology_change(sc, bif) - struct bridge_softc *sc; - struct bridge_iflist *bif; -{ - bif->bif_topology_change_acknowledge = 1; - bstp_transmit_config(sc, bif); + return (flags); } struct mbuf * -bstp_input(sc, ifp, eh, m) - struct bridge_softc *sc; - struct ifnet *ifp; - struct ether_header *eh; - struct mbuf *m; +bstp_input(struct bstp_state *bs, struct bstp_port *bp, + struct ether_header *eh, struct mbuf *m) { - struct bridge_iflist *bif = NULL; struct bstp_tbpdu tpdu; - struct bstp_cbpdu cpdu; - struct bstp_config_unit cu; - struct bstp_tcn_unit tu; u_int16_t len; - LIST_FOREACH(bif, &sc->sc_iflist, next) { - if (!(bif->bif_flags & IFBIF_STP)) - continue; - if (bif->ifp == ifp) - break; - } - if (bif == NULL) + if (bs == NULL || bp == NULL || bp->bp_active == 0) goto out; len = ntohs(eh->ether_type); @@ -662,594 +615,1699 @@ bstp_input(sc, ifp, eh, m) tpdu.tbu_ssap != LLC_8021D_LSAP || tpdu.tbu_ctl != LLC_UI) goto out; - if (tpdu.tbu_protoid != 0 || tpdu.tbu_protover != 0) + if (tpdu.tbu_protoid != BSTP_PROTO_ID) goto out; - switch (tpdu.tbu_bpdutype) { - case BSTP_MSGTYPE_TCN: - tu.tu_message_type = tpdu.tbu_bpdutype; - bstp_received_tcn_bpdu(sc, bif, &tu); - break; - case BSTP_MSGTYPE_CFG: - if ((m = m_pullup(m, sizeof(cpdu))) == NULL) + /* + * 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; - bcopy(mtod(m, struct bstp_cpdu *), &cpdu, sizeof(cpdu)); - - cu.cu_rootid = - (((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_bridge_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_root_path_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_port_id = ntohs(cpdu.cbu_portid); - cu.cu_message_type = cpdu.cbu_bpdutype; - cu.cu_topology_change_acknowledgment = - (cpdu.cbu_flags & BSTP_FLAG_TCA) ? 1 : 0; - cu.cu_topology_change = - (cpdu.cbu_flags & BSTP_FLAG_TC) ? 1 : 0; - bstp_received_config_bpdu(sc, bif, &cu); - break; - default: - goto out; } -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: if (m) m_freem(m); return (NULL); } void -bstp_received_config_bpdu(sc, bif, cu) - struct bridge_softc *sc; - struct bridge_iflist *bif; - struct bstp_config_unit *cu; +bstp_received_stp(struct bstp_state *bs, struct bstp_port *bp, + struct mbuf **mp, struct bstp_tbpdu *tpdu) { - int root; - - root = bstp_root_bridge(sc); - - if (bif->bif_state != BSTP_IFSTATE_DISABLED) { - if (bstp_supersedes_port_info(sc, bif, cu)) { - bstp_record_config_information(sc, bif, cu); - bstp_configuration_update(sc); - bstp_port_state_selection(sc); - - if ((!bstp_root_bridge(sc)) && root) { - bstp_timer_stop(&sc->sc_hello_timer); - - if (sc->sc_topology_change_detected) { - bstp_timer_stop(&sc->sc_topology_change_timer); - bstp_transmit_tcn(sc); - bstp_timer_start(&sc->sc_tcn_timer, 0); - } - } + struct bstp_cbpdu cpdu; + struct bstp_config_unit *cu = &bp->bp_msg_cu; + struct bstp_tcn_unit tu; - if (bif == sc->sc_root_port) { - bstp_record_config_timeout_values(sc, cu); - bstp_config_bpdu_generation(sc); + 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); - if (cu->cu_topology_change_acknowledgment) - bstp_topology_change_acknowledged(sc); - } - } else if (bstp_designated_port(sc, bif)) - bstp_transmit_config(sc, bif); + bstp_decode_bpdu(bp, &cpdu, cu); + bstp_received_bpdu(bs, bp, cu); + break; } } void -bstp_received_tcn_bpdu(sc, bif, tcn) - struct bridge_softc *sc; - struct bridge_iflist *bif; - struct bstp_tcn_unit *tcn; +bstp_received_rstp(struct bstp_state *bs, struct bstp_port *bp, + struct mbuf **mp, struct bstp_tbpdu *tpdu) { - if (bif->bif_state != BSTP_IFSTATE_DISABLED && - bstp_designated_port(sc, bif)) { - bstp_topology_change_detection(sc); - bstp_acknowledge_topology_change(sc, bif); - } + 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_hello_timer_expiry(sc) - struct bridge_softc *sc; +bstp_received_tcn(struct bstp_state *bs, struct bstp_port *bp, + struct bstp_tcn_unit *tcn) { - bstp_config_bpdu_generation(sc); - bstp_timer_start(&sc->sc_hello_timer, 0); + bp->bp_rcvdtcn = 1; + bstp_update_tc(bp); } void -bstp_message_age_timer_expiry(sc, bif) - struct bridge_softc *sc; - struct bridge_iflist *bif; +bstp_received_bpdu(struct bstp_state *bs, struct bstp_port *bp, + struct bstp_config_unit *cu) { - int root; - - root = bstp_root_bridge(sc); - bstp_become_designated_port(sc, bif); - bstp_configuration_update(sc); - bstp_port_state_selection(sc); - - if ((bstp_root_bridge(sc)) && (!root)) { - sc->sc_max_age = sc->sc_bridge_max_age; - sc->sc_hello_time = sc->sc_bridge_hello_time; - sc->sc_forward_delay = sc->sc_bridge_forward_delay; - - bstp_topology_change_detection(sc); - bstp_timer_stop(&sc->sc_tcn_timer); - bstp_config_bpdu_generation(sc); - bstp_timer_start(&sc->sc_hello_timer, 0); + 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_RECIEVED)) + 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_RECIEVED; + 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_p2p_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); } -void -bstp_forward_delay_timer_expiry(sc, bif) - struct bridge_softc *sc; - struct bridge_iflist *bif; +int +bstp_pdu_rcvtype(struct bstp_port *bp, struct bstp_config_unit *cu) { - if (bif->bif_state == BSTP_IFSTATE_LISTENING) { - bstp_set_port_state(bif, BSTP_IFSTATE_LEARNING); - bstp_timer_start(&bif->bif_forward_delay_timer, 0); - } else if (bif->bif_state == BSTP_IFSTATE_LEARNING) { - bstp_set_port_state(bif, BSTP_IFSTATE_FORWARDING); - if (bstp_designated_for_some_port(sc) && - bif->bif_change_detection_enabled) - bstp_topology_change_detection(sc); + 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_designated_for_some_port(sc) - struct bridge_softc *sc; +bstp_pdu_bettersame(struct bstp_port *bp, int newinfo) { + if (newinfo == BSTP_INFO_RECIEVED && + bp->bp_infois == BSTP_INFO_RECIEVED && + bstp_info_cmp(&bp->bp_port_pv, &bp->bp_msg_cu.cu_pv) >= INFO_SAME) + return (1); - struct bridge_iflist *bif; + 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); - LIST_FOREACH(bif, &sc->sc_iflist, next) { - if (!(bif->bif_flags & IFBIF_STP)) - continue; - if (bif->bif_designated_bridge == sc->sc_bridge_id) - return (1); - } return (0); } -void -bstp_tcn_timer_expiry(sc) - struct bridge_softc *sc; +int +bstp_info_cmp(struct bstp_pri_vector *pv, + struct bstp_pri_vector *cpv) { - bstp_transmit_tcn(sc); - bstp_timer_start(&sc->sc_tcn_timer, 0); + 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_topology_change_timer_expiry(sc) - struct bridge_softc *sc; +bstp_assign_roles(struct bstp_state *bs) { - sc->sc_topology_change_detected = 0; - sc->sc_topology_change = 0; + struct bstp_port *bp, *rbp = NULL; + struct bstp_pri_vector pv; + + /* 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; + + /* check if any recieved info supersedes us */ + LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { + if (bp->bp_infois != BSTP_INFO_RECIEVED) + 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_RECIEVED: + 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_hold_timer_expiry(sc, bif) - struct bridge_softc *sc; - struct bridge_iflist *bif; +bstp_update_state(struct bstp_state *bs, struct bstp_port *bp) { - if (bif->bif_config_pending) - bstp_transmit_config(sc, bif); + struct bstp_port *bp2; + int synced; + + /* check if all the ports have syncronised again */ + if (!bs->bs_allsynced) { + synced = 1; + LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) { + if (!(bp->bp_synced || + bp->bp_role == BSTP_ROLE_ROOT)) { + synced = 0; + break; + } + } + bs->bs_allsynced = synced; + } + + bstp_update_roles(bs, bp); + bstp_update_tc(bp); } void -bstp_initialization(sc) - struct bridge_softc *sc; +bstp_update_roles(struct bstp_state *bs, struct bstp_port *bp) { - struct bridge_iflist *bif, *mif; - struct arpcom *ac, *mac; + 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; - mif = NULL; mac = NULL; - LIST_FOREACH(bif, &sc->sc_iflist, next) { - if (!(bif->bif_flags & IFBIF_STP)) - continue; - if (bif->ifp->if_type != IFT_ETHER) - continue; - bif->bif_port_id = (bif->bif_priority << 8) | - (bif->ifp->if_index & 0xff); + 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("%s -> ALTERNATE_AGREED\n", + bp->bp_ifp->if_xname); + } - if (mif == NULL) { - mif = bif; - mac = (struct arpcom *)bif->ifp; - continue; + if (bp->bp_proposed && !bp->bp_agree) { + bstp_set_all_sync(bs); + bp->bp_proposed = 0; + DPRINTF("%s -> ALTERNATE_PROPOSED\n", + bp->bp_ifp->if_xname); } - ac = (struct arpcom *)bif->ifp; - if (memcmp(ac->ac_enaddr, mac->ac_enaddr, ETHER_ADDR_LEN) < 0) { - mif = bif; - mac = (struct arpcom *)bif->ifp; - continue; + + /* 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("%s -> ALTERNATE_PORT\n", bp->bp_ifp->if_xname); } - } - if (mif == NULL) { - bstp_stop(sc); - return; + break; + + case BSTP_ROLE_ROOT: + if (bp->bp_state != BSTP_IFSTATE_FORWARDING && !bp->bp_reroot) { + bstp_set_all_reroot(bs); + DPRINTF("%s -> ROOT_REROOT\n", bp->bp_ifp->if_xname); + } + + 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("%s -> ROOT_AGREED\n", bp->bp_ifp->if_xname); + } + + if (bp->bp_proposed && !bp->bp_agree) { + bstp_set_all_sync(bs); + bp->bp_proposed = 0; + DPRINTF("%s -> ROOT_PROPOSED\n", bp->bp_ifp->if_xname); + } + + 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("%s -> ROOT_REROOTED\n", bp->bp_ifp->if_xname); + } + break; + + case BSTP_ROLE_DESIGNATED: + if (bp->bp_recent_root_timer.active == 0 && bp->bp_reroot) { + bp->bp_reroot = 0; + DPRINTF("%s -> DESIGNATED_RETIRED\n", + bp->bp_ifp->if_xname); + } + + 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("%s -> DESIGNATED_SYNCED\n", + bp->bp_ifp->if_xname); + } + + 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_p2p_link ? BSTP_DEFAULT_MIGRATE_DELAY : + bp->bp_desg_max_age)); + DPRINTF("%s -> DESIGNATED_PROPOSE\n", + bp->bp_ifp->if_xname); + } + + 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("%s -> AGREED\n", bp->bp_ifp->if_xname); + /* + * 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("%s -> DESIGNATED_DISCARD\n", + bp->bp_ifp->if_xname); + } + break; } - sc->sc_bridge_id = - (((u_int64_t)sc->sc_bridge_priority) << 48) | - (((u_int64_t)mac->ac_enaddr[0]) << 40) | - (((u_int64_t)mac->ac_enaddr[1]) << 32) | - ((unsigned int)mac->ac_enaddr[2] << 24) | - ((unsigned int)mac->ac_enaddr[3] << 16) | - ((unsigned int)mac->ac_enaddr[4] << 8) | - ((unsigned int)mac->ac_enaddr[5]); - - sc->sc_designated_root = sc->sc_bridge_id; - sc->sc_root_path_cost = 0; - sc->sc_root_port = NULL; - - sc->sc_max_age = sc->sc_bridge_max_age; - sc->sc_hello_time = sc->sc_bridge_hello_time; - sc->sc_forward_delay = sc->sc_bridge_forward_delay; - sc->sc_topology_change_detected = 0; - sc->sc_topology_change = 0; - bstp_timer_stop(&sc->sc_tcn_timer); - bstp_timer_stop(&sc->sc_topology_change_timer); - - if (!timeout_initialized(&sc->sc_bstptimeout)) - timeout_set(&sc->sc_bstptimeout, bstp_tick, sc); - if (!timeout_pending(&sc->sc_bstptimeout)) - timeout_add(&sc->sc_bstptimeout, hz); - - LIST_FOREACH(bif, &sc->sc_iflist, next) { - if (bif->bif_flags & IFBIF_STP) - bstp_enable_port(sc, bif); - else - bstp_disable_port(sc, bif); + 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("Invalid TC state for %s\n", + bp->bp_ifp->if_xname); + break; } - bstp_port_state_selection(sc); - bstp_config_bpdu_generation(sc); - bstp_timer_start(&sc->sc_hello_timer, 0); } void -bstp_stop(sc) - struct bridge_softc *sc; +bstp_update_info(struct bstp_port *bp) { + struct bstp_state *bs = bp->bp_bs; - struct bridge_iflist *bif; + bp->bp_proposing = 0; + bp->bp_proposed = 0; - LIST_FOREACH(bif, &sc->sc_iflist, next) { - bstp_set_port_state(bif, BSTP_IFSTATE_DISABLED); - bstp_timer_stop(&bif->bif_hold_timer); - bstp_timer_stop(&bif->bif_message_age_timer); - bstp_timer_stop(&bif->bif_forward_delay_timer); + 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; } - if (timeout_initialized(&sc->sc_bstptimeout) && - timeout_pending(&sc->sc_bstptimeout)) - timeout_del(&sc->sc_bstptimeout); + /* 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; - bstp_timer_stop(&sc->sc_topology_change_timer); - bstp_timer_stop(&sc->sc_tcn_timer); - bstp_timer_stop(&sc->sc_hello_timer); + /* 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; + bp->bp_tc_prop = 1; + } } void -bstp_initialize_port(sc, bif) - struct bridge_softc *sc; - struct bridge_iflist *bif; +bstp_set_all_reroot(struct bstp_state *bs) { - bstp_become_designated_port(sc, bif); - bstp_set_port_state(bif, BSTP_IFSTATE_BLOCKING); - bif->bif_topology_change_acknowledge = 0; - bif->bif_config_pending = 0; - bstp_enable_change_detection(bif); - bstp_timer_stop(&bif->bif_message_age_timer); - bstp_timer_stop(&bif->bif_forward_delay_timer); - bstp_timer_stop(&bif->bif_hold_timer); + struct bstp_port *bp; + + LIST_FOREACH(bp, &bs->bs_bplist, bp_next) + bp->bp_reroot = 1; } void -bstp_enable_port(sc, bif) - struct bridge_softc *sc; - struct bridge_iflist *bif; +bstp_set_all_sync(struct bstp_state *bs) { - bstp_initialize_port(sc, bif); - bstp_port_state_selection(sc); + 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_disable_port(sc, bif) - struct bridge_softc *sc; - struct bridge_iflist *bif; +bstp_set_port_state(struct bstp_port *bp, int state) { - int root; - - root = bstp_root_bridge(sc); - bstp_become_designated_port(sc, bif); - bstp_set_port_state(bif, BSTP_IFSTATE_DISABLED); - bif->bif_topology_change_acknowledge = 0; - bif->bif_config_pending = 0; - bstp_timer_stop(&bif->bif_message_age_timer); - bstp_timer_stop(&bif->bif_forward_delay_timer); - bstp_configuration_update(sc); - bstp_port_state_selection(sc); - bridge_rtdelete(sc, bif->ifp, 1); - - if (bstp_root_bridge(sc) && (!root)) { - sc->sc_max_age = sc->sc_bridge_max_age; - sc->sc_hello_time = sc->sc_bridge_hello_time; - sc->sc_forward_delay = sc->sc_bridge_forward_delay; - - bstp_topology_change_detection(sc); - bstp_timer_stop(&sc->sc_tcn_timer); - bstp_config_bpdu_generation(sc); - bstp_timer_start(&sc->sc_hello_timer, 0); + if (bp->bp_state == state) + return; + + bp->bp_state = state; + + switch (bp->bp_state) { + case BSTP_IFSTATE_DISCARDING: + DPRINTF("state changed to DISCARDING on %s\n", + bp->bp_ifp->if_xname); + break; + + case BSTP_IFSTATE_LEARNING: + DPRINTF("state changed to LEARNING on %s\n", + bp->bp_ifp->if_xname); + + 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("state changed to FORWARDING on %s\n", + bp->bp_ifp->if_xname); + + bstp_timer_stop(&bp->bp_forward_delay_timer); + /* Record that we enabled forwarding */ + bp->bp_forward_transitions++; + break; } } void -bstp_set_bridge_priority(sc, new_bridge_id) - struct bridge_softc *sc; - u_int64_t new_bridge_id; +bstp_set_port_role(struct bstp_port *bp, int role) { - int root; - struct bridge_iflist *bif; + struct bstp_state *bs = bp->bp_bs; - root = bstp_root_bridge(sc); + if (bp->bp_role == role) + return; - LIST_FOREACH(bif, &sc->sc_iflist, next) { - if (!(bif->bif_flags & IFBIF_STP)) - continue; - if (bstp_designated_port(sc, bif)) - bif->bif_designated_bridge = new_bridge_id; + /* 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; } - sc->sc_bridge_id = new_bridge_id; + 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("%s role -> ALT/BACK/DISABLED\n", + bp->bp_ifp->if_xname); + 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("%s role -> ROOT\n", + bp->bp_ifp->if_xname); + 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("%s role -> DESIGNATED\n", + bp->bp_ifp->if_xname); + 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); +} - bstp_configuration_update(sc); - bstp_port_state_selection(sc); +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; - if (bstp_root_bridge(sc) && (!root)) { - sc->sc_max_age = sc->sc_bridge_max_age; - sc->sc_hello_time = sc->sc_bridge_hello_time; - sc->sc_forward_delay = sc->sc_bridge_forward_delay; + case BSTP_PROTO_RSTP: + bstp_timer_start(&bp->bp_migrate_delay_timer, + bs->bs_migration_delay); + break; - bstp_topology_change_detection(sc); - bstp_timer_stop(&sc->sc_tcn_timer); - bstp_config_bpdu_generation(sc); - bstp_timer_start(&sc->sc_hello_timer, 0); + default: + DPRINTF("Unsupported STP version %d\n", proto); + return; } + + bp->bp_protover = proto; + bp->bp_flags &= ~BSTP_PORT_CANMIGRATE; } void -bstp_set_port_priority(sc, bif, new_port_id) - struct bridge_softc *sc; - struct bridge_iflist *bif; - u_int16_t new_port_id; +bstp_set_port_tc(struct bstp_port *bp, int state) { - if (bstp_designated_port(sc, bif)) - bif->bif_designated_port = new_port_id; + struct bstp_state *bs = bp->bp_bs; + + bp->bp_tcstate = state; + + /* initialise the new state */ + switch (bp->bp_tcstate) { + case BSTP_TCSTATE_ACTIVE: + DPRINTF("%s -> TC_ACTIVE\n", bp->bp_ifp->if_xname); + /* 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->bp_ifp, 0); + bp->bp_tc_ack = 0; + DPRINTF("%s -> TC_INACTIVE\n", bp->bp_ifp->if_xname); + break; + + case BSTP_TCSTATE_LEARNING: + bp->bp_rcvdtc = 0; + bp->bp_rcvdtcn = 0; + bp->bp_rcvdtca = 0; + bp->bp_tc_prop = 0; + DPRINTF("%s -> TC_LEARNING\n", bp->bp_ifp->if_xname); + 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("%s -> TC_DETECTED\n", bp->bp_ifp->if_xname); + bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ + break; - bif->bif_port_id = new_port_id; + case BSTP_TCSTATE_TCN: + bstp_set_timer_tc(bp); + DPRINTF("%s -> TC_TCN\n", bp->bp_ifp->if_xname); + /* FALLTROUGH */ + 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("%s -> TC_TC\n", bp->bp_ifp->if_xname); + 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->bp_ifp, 0); + bp->bp_tc_prop = 0; + bstp_set_timer_tc(bp); + DPRINTF("%s -> TC_PROPAG\n", bp->bp_ifp->if_xname); + bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ + break; - if ((sc->sc_bridge_id == bif->bif_designated_bridge) && - (bif->bif_port_id < bif->bif_designated_port)) { - bstp_become_designated_port(sc, bif); - bstp_port_state_selection(sc); + case BSTP_TCSTATE_ACK: + bstp_timer_stop(&bp->bp_tc_timer); + bp->bp_rcvdtca = 0; + DPRINTF("%s -> TC_ACK\n", bp->bp_ifp->if_xname); + bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */ + break; } } void -bstp_set_path_cost(sc, bif, path_cost) - struct bridge_softc *sc; - struct bridge_iflist *bif; - u_int32_t path_cost; +bstp_set_timer_tc(struct bstp_port *bp) { - bif->bif_path_cost = path_cost; - bstp_configuration_update(sc); - bstp_port_state_selection(sc); + 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_enable_change_detection(bif) - struct bridge_iflist *bif; +bstp_set_timer_msgage(struct bstp_port *bp) { - bif->bif_change_detection_enabled = 1; + 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 = bp->bp_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_baudrate < 1000) + return (BSTP_DEFAULT_PATH_COST); + + /* formula from section 17.14, IEEE Std 802.1D-2004 */ + path_cost = 20000000000ULL / (ifp->if_baudrate / 1000); + + 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_disable_change_detection(bif) - struct bridge_iflist *bif; +bstp_notify_rtage(void *arg, int pending) { - bif->bif_change_detection_enabled = 0; + struct bstp_port *bp = (struct bstp_port *)arg; + int age = 0; + + splassert(IPL_NET); + + 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) + bridge_rtagenode(bp->bp_ifp, age); + + /* flush is complete */ + bp->bp_fdbflush = 0; } void -bstp_ifupdstatus(sc, bif) +bstp_ifstate(void *arg) +{ + struct ifnet *ifp = (struct ifnet *)arg; struct bridge_softc *sc; - struct bridge_iflist *bif; + struct bridge_iflist *p; + struct bstp_port *bp; + struct bstp_state *bs; + int s; + + if (ifp->if_type == IFT_BRIDGE) + return; + sc = (struct bridge_softc *)ifp->if_bridge; + + s = splnet(); + LIST_FOREACH(p, &sc->sc_iflist, next) { + if ((p->bif_flags & IFBIF_STP) == 0) + continue; + if (p->ifp == ifp) + break; + } + if (p == LIST_END(&sc->sc_iflist)) + goto done; + if ((bp = p->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 = bif->ifp; + struct ifnet *ifp = bp->bp_ifp; + + if (ifp == 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 (bif->bif_state == BSTP_IFSTATE_DISABLED) - bstp_enable_port(sc, bif); + if (bp->bp_flags & BSTP_PORT_AUTOP2P) { + /* A full-duplex link is assumed to be p2p */ + bp->bp_p2p_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 (bif->bif_state != BSTP_IFSTATE_DISABLED) - bstp_disable_port(sc, bif); + if (bp->bp_infois != BSTP_INFO_DISABLED) + bstp_disable_port(bs, bp); } } void -bstp_tick(vsc) - void *vsc; +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 bridge_softc *sc = vsc; - struct bridge_iflist *bif; + struct bstp_state *bs = (struct bstp_state *)arg; + struct bstp_port *bp; int s; s = splnet(); + if ((bs->bs_ifflags & IFF_RUNNING) == 0) { + splx(s); + return; + } - LIST_FOREACH(bif, &sc->sc_iflist, next) { - if (!(bif->bif_flags & IFBIF_STP)) - continue; - bstp_ifupdstatus(sc, bif); + /* 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); } - if (bstp_timer_expired(&sc->sc_hello_timer, sc->sc_hello_time)) - bstp_hello_timer_expiry(sc); + 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(&sc->sc_tcn_timer, sc->sc_bridge_hello_time)) - bstp_tcn_timer_expiry(sc); + if (bstp_timer_expired(&bp->bp_hello_timer)) + bstp_hello_timer_expiry(bs, bp); - if (bstp_timer_expired(&sc->sc_topology_change_timer, - sc->sc_topology_change_time)) - bstp_topology_change_timer_expiry(sc); + if (bstp_timer_expired(&bp->bp_message_age_timer)) + bstp_message_age_expiry(bs, bp); - LIST_FOREACH(bif, &sc->sc_iflist, next) { - if (!(bif->bif_flags & IFBIF_STP)) - continue; - if (bstp_timer_expired(&bif->bif_message_age_timer, - sc->sc_max_age)) - bstp_message_age_timer_expiry(sc, bif); - } + if (bstp_timer_expired(&bp->bp_migrate_delay_timer)) + bstp_migrate_delay_expiry(bs, bp); - LIST_FOREACH(bif, &sc->sc_iflist, next) { - if (!(bif->bif_flags & IFBIF_STP)) - continue; - if (bstp_timer_expired(&bif->bif_forward_delay_timer, - sc->sc_forward_delay)) - bstp_forward_delay_timer_expiry(sc, bif); + 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 (bstp_timer_expired(&bif->bif_hold_timer, - sc->sc_hold_time)) - bstp_hold_timer_expiry(sc, bif); + if (bp->bp_txcount > 0) + bp->bp_txcount--; } - if (sc->sc_if.if_flags & IFF_RUNNING) - timeout_add(&sc->sc_bstptimeout, hz); + if (bs->bs_ifp->if_flags & IFF_RUNNING) + timeout_add(&bs->bs_bstptimeout, hz); splx(s); } void -bstp_timer_start(t, v) - struct bridge_timer *t; - u_int16_t v; +bstp_timer_start(struct bstp_timer *t, u_int16_t v) { t->value = v; t->active = 1; + t->latched = 0; } void -bstp_timer_stop(t) - struct bridge_timer *t; +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(t, v) - struct bridge_timer *t; - u_int16_t v; +bstp_timer_expired(struct bstp_timer *t) { - if (!t->active) + if (t->active == 0 || t->latched) return (0); - t->value += BSTP_TICK_VAL; - if (t->value >= v) { + 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_RECIEVED) { + bp->bp_infois = BSTP_INFO_AGED; + bstp_assign_roles(bs); + DPRINTF("aged info on %s\n", bp->bp_ifp->if_xname); + } +} + +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 *ifp, *mif; + u_char *e_addr; + + if (LIST_EMPTY(&bs->bs_bplist)) { + bstp_stop(bs); + return; + } + + mif = NULL; + /* + * Search through the Ethernet interfaces 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. + */ + TAILQ_FOREACH(ifp, &ifnet, if_list) { + if (ifp->if_type != IFT_ETHER) + continue; + if (mif == NULL) { + mif = ifp; + continue; + } + if (bstp_addr_cmp(LLADDR(ifp->if_sadl), + LLADDR(mif->if_sadl)) < 0) { + mif = ifp; + continue; + } + } + + e_addr = LLADDR(mif->if_sadl); + 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 (bs->bs_ifflags & IFF_RUNNING && + !timeout_pending(&bs->bs_bstptimeout)) + timeout_add(&bs->bs_bstptimeout, hz); + + LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { + bp->bp_port_id = (bp->bp_priority << 8) | + (bp->bp_ifp->if_index & 0xfff); + bstp_ifupdstatus(bs, bp); + } + + bstp_assign_roles(bs); + bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER); +} + +struct bstp_state * +bstp_create(struct ifnet *ifp) +{ + struct bstp_state *bs; + int s; + + s = splnet(); + bs = (struct bstp_state *)malloc(sizeof(*bs), M_DEVBUF, M_WAITOK); + bzero(bs, sizeof(*bs)); + LIST_INIT(&bs->bs_bplist); + + bs->bs_ifp = ifp; + 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); + + LIST_INSERT_HEAD(&bstp_list, bs, bs_list); + splx(s); + + return (bs); +} + +void +bstp_destroy(struct bstp_state *bs) +{ + int s; + + if (bs == NULL) + return; + + if (!LIST_EMPTY(&bs->bs_bplist)) + panic("bstp still active"); + + s = splnet(); + LIST_REMOVE(bs, bs_list); + free(bs, M_DEVBUF); + splx(s); +} + +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_pending(&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 = (struct bstp_port *)malloc(sizeof(*bp), M_DEVBUF, M_NOWAIT); + if (bp == NULL) + return (NULL); + bzero(bp, sizeof(*bp)); + + bp->bp_ifp = ifp; + 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_AUTOP2P; + 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 */ + if (ifp->if_linkstatehooks != NULL) + bp->bp_lhcookie = hook_establish(ifp->if_linkstatehooks, 1, + bstp_ifstate, ifp); + + return (bp); +} +void +bstp_delete(struct bstp_port *bp) +{ + struct bstp_state *bs = bp->bp_bs; + struct ifnet *ifp = bp->bp_ifp; + + if (!bp->bp_active) + panic("not a bstp member"); + + if (ifp != NULL && ifp->if_linkstatehooks != NULL) + hook_disestablish(ifp->if_linkstatehooks, bp->bp_lhcookie); + + LIST_REMOVE(bp, bp_next); + bp->bp_bs = NULL; + bp->bp_active = 0; + free(bp, M_DEVBUF); + 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_AUTOP2P) { + if ((bp->bp_flags & BSTP_PORT_AUTOP2P) == 0) { + bp->bp_flags |= BSTP_PORT_AUTOP2P; + + bstp_ifupdstatus(bs, bp); + } + } else + bp->bp_flags &= ~BSTP_PORT_AUTOP2P; + + if (flags & IFBIF_BSTP_P2P) + bp->bp_p2p_link = 1; + else + bp->bp_p2p_link = 0; } int -bstp_ioctl(ifp, cmd, data) - struct ifnet *ifp; - u_long cmd; - caddr_t data; +bstp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) { struct bridge_softc *sc = (struct bridge_softc *)ifp; - struct ifbrparam *bp = (struct ifbrparam *)data; - int r = 0, err = 0; + struct bstp_state *bs = sc->sc_stp; + struct ifbrparam *ifbp = (struct ifbrparam *)data; + struct ifbreq *ifbr = (struct ifbreq *)data; + struct bridge_iflist *p; + struct ifnet *ifs; + struct bstp_port *bp; + int r = 0, err = 0, val; switch (cmd) { - case SIOCBRDGGPRI: - bp->ifbrp_prio = sc->sc_bridge_priority; - break; - case SIOCBRDGGMA: - bp->ifbrp_maxage = sc->sc_bridge_max_age >> 8; + case SIOCBRDGSIFPRIO: + case SIOCBRDGSIFCOST: + ifs = ifunit(ifbr->ifbr_ifsname); + if (ifs == NULL) { + err = ENOENT; + break; + } + if ((caddr_t)sc != ifs->if_bridge) { + err = ESRCH; + break; + } + LIST_FOREACH(p, &sc->sc_iflist, next) { + if (p->ifp == ifs) + break; + } + if (p == LIST_END(&sc->sc_iflist)) { + err = ESRCH; + break; + } + if ((p->bif_flags & IFBIF_STP) == 0) { + err = EINVAL; + break; + } + bp = p->bif_stp; break; - case SIOCBRDGGHT: - bp->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; + default: break; - case SIOCBRDGGFD: - bp->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; + } + if (err) + return (err); + + switch (cmd) { + case SIOCBRDGGPRI: + ifbp->ifbrp_prio = bs->bs_bridge_priority; break; case SIOCBRDGSPRI: - sc->sc_bridge_priority = bp->ifbrp_prio; + 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: - if (bp->ifbrp_maxage == 0) { + 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; } - sc->sc_bridge_max_age = bp->ifbrp_maxage << 8; + bs->bs_bridge_max_age = val; r = 1; break; + case SIOCBRDGGHT: + ifbp->ifbrp_hellotime = bs->bs_bridge_htime >> 8; + break; case SIOCBRDGSHT: - if (bp->ifbrp_hellotime == 0) { + val = ifbp->ifbrp_hellotime; + + /* convert seconds to ticks */ + val *= BSTP_TICK_VAL; + + /* value can only be changed in leagacy 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; } - sc->sc_bridge_hello_time = bp->ifbrp_hellotime << 8; + bs->bs_bridge_htime = val; r = 1; break; + case SIOCBRDGGFD: + ifbp->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; + break; case SIOCBRDGSFD: - if (bp->ifbrp_fwddelay == 0) { + 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; } - sc->sc_bridge_forward_delay = bp->ifbrp_fwddelay << 8; + bs->bs_bridge_fdelay = val; r = 1; break; - case SIOCBRDGADD: - case SIOCBRDGDEL: - case SIOCBRDGSIFFLGS: + 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(sc); + bstp_initialization(bs); return (err); } - #endif /* NBRIDGE */ |