Date: Wed, 1 Nov 2006 09:26:07 GMT From: John Birrell <jb@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 108903 for review Message-ID: <200611010926.kA19Q7CJ074105@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=108903 Change 108903 by jb@jb_freebsd8 on 2006/11/01 09:25:13 IFC Affected files ... .. //depot/projects/dtrace/src/sys/net/bridgestp.c#8 integrate .. //depot/projects/dtrace/src/sys/net/bridgestp.h#4 integrate .. //depot/projects/dtrace/src/sys/net/if_bridge.c#15 integrate .. //depot/projects/dtrace/src/sys/net/if_bridgevar.h#6 integrate .. //depot/projects/dtrace/www/de/docs/books.sgml#8 integrate .. //depot/projects/dtrace/www/de/security/security.sgml#8 integrate .. //depot/projects/dtrace/www/de/share/sgml/news.xml#5 integrate .. //depot/projects/dtrace/www/de/share/sgml/press.xml#5 integrate Differences ... ==== //depot/projects/dtrace/src/sys/net/bridgestp.c#8 (text+ko) ==== @@ -2,6 +2,7 @@ /* * 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 @@ -30,12 +31,11 @@ /* * 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. */ #include <sys/cdefs.h> -__FBSDID("$FreeBSD: src/sys/net/bridgestp.c,v 1.20 2006/10/01 03:48:32 thompsa Exp $"); +__FBSDID("$FreeBSD: src/sys/net/bridgestp.c,v 1.21 2006/11/01 09:07:47 thompsa Exp $"); #include <sys/param.h> #include <sys/systm.h> @@ -62,276 +62,172 @@ #include <netinet/if_ether.h> #include <net/bridgestp.h> +#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 + const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; LIST_HEAD(, bstp_state) bstp_list; static struct mtx bstp_list_mtx; -static void bstp_initialize_port(struct bstp_state *, - struct bstp_port *); +static void bstp_transmit(struct bstp_state *, struct bstp_port *); +static void bstp_transmit_bpdu(struct bstp_state *, struct bstp_port *); +static void bstp_transmit_tcn(struct bstp_state *, struct bstp_port *); +static void bstp_decode_bpdu(struct bstp_port *, struct bstp_cbpdu *, + struct bstp_config_unit *); +static void bstp_send_bpdu(struct bstp_state *, struct bstp_port *, + struct bstp_cbpdu *); +static void bstp_enqueue(struct ifnet *, struct mbuf *); +static int bstp_pdu_flags(struct bstp_port *); +static void bstp_received_stp(struct bstp_state *, struct bstp_port *, + struct mbuf *, struct bstp_tbpdu *); +static void bstp_received_rstp(struct bstp_state *, struct bstp_port *, + struct mbuf *, struct bstp_tbpdu *); +static void bstp_received_tcn(struct bstp_state *, struct bstp_port *, + struct bstp_tcn_unit *); +static void bstp_received_bpdu(struct bstp_state *, struct bstp_port *, + struct bstp_config_unit *); +static int bstp_pdu_rcvtype(struct bstp_port *, struct bstp_config_unit *); +static int bstp_pdu_bettersame(struct bstp_port *, int); +static int bstp_info_cmp(struct bstp_pri_vector *, + struct bstp_pri_vector *); +static int bstp_info_superior(struct bstp_pri_vector *, + struct bstp_pri_vector *); +static void bstp_assign_roles(struct bstp_state *); +static void bstp_update_roles(struct bstp_state *, struct bstp_port *); +static void bstp_update_state(struct bstp_state *, struct bstp_port *); +static void bstp_update_tc(struct bstp_port *); +static void bstp_update_info(struct bstp_port *); +static void bstp_set_other_tcprop(struct bstp_port *); +static void bstp_set_all_reroot(struct bstp_state *); +static void bstp_set_all_sync(struct bstp_state *); +static void bstp_set_port_state(struct bstp_port *, int); +static void bstp_set_port_role(struct bstp_port *, int); +static void bstp_set_port_proto(struct bstp_port *, int); +static void bstp_set_port_tc(struct bstp_port *, int); +static void bstp_set_timer_tc(struct bstp_port *); +static void bstp_set_timer_msgage(struct bstp_port *); +static int bstp_rerooted(struct bstp_state *, struct bstp_port *); +static uint32_t bstp_calc_path_cost(struct bstp_port *); +static void bstp_notify_state(void *, int); +static void bstp_notify_rtage(void *, int); static void bstp_ifupdstatus(struct bstp_state *, struct bstp_port *); static void bstp_enable_port(struct bstp_state *, struct bstp_port *); -static void bstp_disable_port(struct bstp_state *, - struct bstp_port *); -#ifdef notused -static void bstp_enable_change_detection(struct bstp_port *); -static void bstp_disable_change_detection(struct bstp_port *); -#endif /* notused */ -static int bstp_root_bridge(struct bstp_state *bs); -static int bstp_supersedes_port_info(struct bstp_state *, - struct bstp_port *, struct bstp_config_unit *); -static int bstp_designated_port(struct bstp_state *, - struct bstp_port *); -static int bstp_designated_for_some_port(struct bstp_state *); -static void bstp_transmit_config(struct bstp_state *, - struct bstp_port *); -static void bstp_transmit_tcn(struct bstp_state *); -static void bstp_received_config_bpdu(struct bstp_state *, - struct bstp_port *, struct bstp_config_unit *); -static void bstp_received_tcn_bpdu(struct bstp_state *, - struct bstp_port *, struct bstp_tcn_unit *); -static void bstp_record_config_information(struct bstp_state *, - struct bstp_port *, struct bstp_config_unit *); -static void bstp_record_config_timeout_values(struct bstp_state *, - struct bstp_config_unit *); -static void bstp_config_bpdu_generation(struct bstp_state *); -static void bstp_send_config_bpdu(struct bstp_state *, - struct bstp_port *, struct bstp_config_unit *); -static void bstp_configuration_update(struct bstp_state *); -static void bstp_root_selection(struct bstp_state *); -static void bstp_designated_port_selection(struct bstp_state *); -static void bstp_become_designated_port(struct bstp_state *, - struct bstp_port *); -static void bstp_port_state_selection(struct bstp_state *); -static void bstp_make_forwarding(struct bstp_state *, - struct bstp_port *); -static void bstp_make_blocking(struct bstp_state *, - struct bstp_port *); -static void bstp_set_port_state(struct bstp_port *, uint8_t); -static void bstp_state_change(void *, int); -static void bstp_update_forward_transitions(struct bstp_port *); -#ifdef notused -static void bstp_set_bridge_priority(struct bstp_state *, uint64_t); -static void bstp_set_port_priority(struct bstp_state *, - struct bstp_port *, uint16_t); -static void bstp_set_path_cost(struct bstp_state *, - struct bstp_port *, uint32_t); -#endif /* notused */ -static void bstp_topology_change_detection(struct bstp_state *); -static void bstp_topology_change_acknowledged(struct bstp_state *); -static void bstp_acknowledge_topology_change(struct bstp_state *, - struct bstp_port *); - -static void bstp_enqueue(struct ifnet *, struct mbuf *); +static void bstp_disable_port(struct bstp_state *, struct bstp_port *); static void bstp_tick(void *); static void bstp_timer_start(struct bstp_timer *, uint16_t); static void bstp_timer_stop(struct bstp_timer *); -static int bstp_timer_expired(struct bstp_timer *, uint16_t); - -static void bstp_hold_timer_expiry(struct bstp_state *, +static void bstp_timer_latch(struct bstp_timer *); +static int bstp_timer_expired(struct bstp_timer *); +static void bstp_hello_timer_expiry(struct bstp_state *, + struct bstp_port *); +static void bstp_message_age_expiry(struct bstp_state *, struct bstp_port *); -static void bstp_message_age_timer_expiry(struct bstp_state *, +static void bstp_migrate_delay_expiry(struct bstp_state *, struct bstp_port *); -static void bstp_forward_delay_timer_expiry(struct bstp_state *, +static void bstp_edge_delay_expiry(struct bstp_state *, struct bstp_port *); -static void bstp_topology_change_timer_expiry(struct bstp_state *); -static void bstp_tcn_timer_expiry(struct bstp_state *); -static void bstp_hello_timer_expiry(struct bstp_state *); static int bstp_addr_cmp(const uint8_t *, const uint8_t *); +static int bstp_same_bridgeid(uint64_t, uint64_t); +static void bstp_reinit(struct bstp_state *); +static void bstp_stop_locked(struct bstp_state *); static void -bstp_transmit_config(struct bstp_state *bs, struct bstp_port *bp) +bstp_transmit(struct bstp_state *bs, struct bstp_port *bp) { - BSTP_LOCK_ASSERT(bs); - - if (bp->bp_hold_timer.active) { - bp->bp_config_pending = 1; + /* + * 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; - bp->bp_config_bpdu.cu_message_type = BSTP_MSGTYPE_CFG; - bp->bp_config_bpdu.cu_rootid = bs->bs_designated_root; - bp->bp_config_bpdu.cu_root_path_cost = bs->bs_root_path_cost; - bp->bp_config_bpdu.cu_bridge_id = bs->bs_bridge_id; - bp->bp_config_bpdu.cu_port_id = bp->bp_port_id; + 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; - if (bstp_root_bridge(bs)) - bp->bp_config_bpdu.cu_message_age = 0; - else - bp->bp_config_bpdu.cu_message_age = - bs->bs_root_port->bp_message_age_timer.value + - BSTP_MESSAGE_AGE_INCR; - - bp->bp_config_bpdu.cu_max_age = bs->bs_max_age; - bp->bp_config_bpdu.cu_hello_time = bs->bs_hello_time; - bp->bp_config_bpdu.cu_forward_delay = bs->bs_forward_delay; - bp->bp_config_bpdu.cu_topology_change_acknowledgment - = bp->bp_topology_change_acknowledge; - bp->bp_config_bpdu.cu_topology_change = bs->bs_topology_change; - - if (bp->bp_config_bpdu.cu_message_age < bs->bs_max_age) { - bp->bp_topology_change_acknowledge = 0; - bp->bp_config_pending = 0; - bstp_send_config_bpdu(bs, bp, &bp->bp_config_bpdu); - bstp_timer_start(&bp->bp_hold_timer, 0); + 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; } static void -bstp_send_config_bpdu(struct bstp_state *bs, struct bstp_port *bp, - struct bstp_config_unit *cu) +bstp_transmit_bpdu(struct bstp_state *bs, struct bstp_port *bp) { - struct ifnet *ifp; - struct mbuf *m; - struct ether_header *eh; struct bstp_cbpdu bpdu; BSTP_LOCK_ASSERT(bs); - ifp = bp->bp_ifp; + bpdu.cbu_rootpri = htons(bp->bp_desg_pv.pv_root_id >> 48); + PV2ADDR(bp->bp_desg_pv.pv_root_id, bpdu.cbu_rootaddr); - if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) - return; + bpdu.cbu_rootpathcost = htonl(bp->bp_desg_pv.pv_cost); - MGETHDR(m, M_DONTWAIT, MT_DATA); - if (m == NULL) - return; + bpdu.cbu_bridgepri = htons(bp->bp_desg_pv.pv_dbridge_id >> 48); + PV2ADDR(bp->bp_desg_pv.pv_dbridge_id, bpdu.cbu_bridgeaddr); - eh = mtod(m, struct ether_header *); + 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); - m->m_pkthdr.rcvif = ifp; - m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu); - m->m_len = m->m_pkthdr.len; + bpdu.cbu_flags = bstp_pdu_flags(bp); - 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); + switch (bp->bp_protover) { + case BSTP_PROTO_STP: + bpdu.cbu_bpdutype = BSTP_MSGTYPE_CFG; + break; - 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); - - memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); - memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); - eh->ether_type = htons(sizeof(bpdu)); - - memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu)); - - bstp_enqueue(ifp, m); -} - -static int -bstp_root_bridge(struct bstp_state *bs) -{ - return (bs->bs_designated_root == bs->bs_bridge_id); -} - -static int -bstp_supersedes_port_info(struct bstp_state *bs, struct bstp_port *bp, - struct bstp_config_unit *cu) -{ - if (cu->cu_rootid < bp->bp_designated_root) - return (1); - if (cu->cu_rootid > bp->bp_designated_root) - return (0); - - if (cu->cu_root_path_cost < bp->bp_designated_cost) - return (1); - if (cu->cu_root_path_cost > bp->bp_designated_cost) - return (0); - - if (cu->cu_bridge_id < bp->bp_designated_bridge) - return (1); - if (cu->cu_bridge_id > bp->bp_designated_bridge) - return (0); - - if (bs->bs_bridge_id != cu->cu_bridge_id) - return (1); - if (cu->cu_port_id <= bp->bp_designated_port) - return (1); - return (0); -} - -static void -bstp_record_config_information(struct bstp_state *bs, - struct bstp_port *bp, struct bstp_config_unit *cu) -{ - BSTP_LOCK_ASSERT(bs); - - bp->bp_designated_root = cu->cu_rootid; - bp->bp_designated_cost = cu->cu_root_path_cost; - bp->bp_designated_bridge = cu->cu_bridge_id; - bp->bp_designated_port = cu->cu_port_id; - bstp_timer_start(&bp->bp_message_age_timer, cu->cu_message_age); -} - -static void -bstp_record_config_timeout_values(struct bstp_state *bs, - struct bstp_config_unit *config) -{ - BSTP_LOCK_ASSERT(bs); - - bs->bs_max_age = config->cu_max_age; - bs->bs_hello_time = config->cu_hello_time; - bs->bs_forward_delay = config->cu_forward_delay; - bs->bs_topology_change = config->cu_topology_change; -} - -static void -bstp_config_bpdu_generation(struct bstp_state *bs) -{ - struct bstp_port *bp; - - BSTP_LOCK_ASSERT(bs); - - LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { - if (bstp_designated_port(bs, bp) && - (bp->bp_state != BSTP_IFSTATE_DISABLED)) - bstp_transmit_config(bs, bp); + case BSTP_PROTO_RSTP: + bpdu.cbu_bpdutype = BSTP_MSGTYPE_RSTP; + break; } -} -static int -bstp_designated_port(struct bstp_state *bs, struct bstp_port *bp) -{ - return ((bp->bp_designated_bridge == bs->bs_bridge_id) - && (bp->bp_designated_port == bp->bp_port_id)); + bstp_send_bpdu(bs, bp, &bpdu); } static void -bstp_transmit_tcn(struct bstp_state *bs) +bstp_transmit_tcn(struct bstp_state *bs, struct bstp_port *bp) { struct bstp_tbpdu bpdu; - struct bstp_port *bp = bs->bs_root_port; struct ifnet *ifp = bp->bp_ifp; struct ether_header *eh; struct mbuf *m; - BSTP_LOCK_ASSERT(bs); + KASSERT(bp == bs->bs_root_port, ("%s: bad root port\n", __func__)); if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) return; @@ -358,234 +254,205 @@ memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu)); + bp->bp_txcount++; bstp_enqueue(ifp, m); } static void -bstp_configuration_update(struct bstp_state *bs) +bstp_decode_bpdu(struct bstp_port *bp, struct bstp_cbpdu *cpdu, + struct bstp_config_unit *cu) { - BSTP_LOCK_ASSERT(bs); + int flags; - bstp_root_selection(bs); - bstp_designated_port_selection(bs); -} + cu->cu_pv.pv_root_id = + (((uint64_t)ntohs(cpdu->cbu_rootpri)) << 48) | + (((uint64_t)cpdu->cbu_rootaddr[0]) << 40) | + (((uint64_t)cpdu->cbu_rootaddr[1]) << 32) | + (((uint64_t)cpdu->cbu_rootaddr[2]) << 24) | + (((uint64_t)cpdu->cbu_rootaddr[3]) << 16) | + (((uint64_t)cpdu->cbu_rootaddr[4]) << 8) | + (((uint64_t)cpdu->cbu_rootaddr[5]) << 0); -static void -bstp_root_selection(struct bstp_state *bs) -{ - struct bstp_port *root_port = NULL, *bp; + cu->cu_pv.pv_dbridge_id = + (((uint64_t)ntohs(cpdu->cbu_bridgepri)) << 48) | + (((uint64_t)cpdu->cbu_bridgeaddr[0]) << 40) | + (((uint64_t)cpdu->cbu_bridgeaddr[1]) << 32) | + (((uint64_t)cpdu->cbu_bridgeaddr[2]) << 24) | + (((uint64_t)cpdu->cbu_bridgeaddr[3]) << 16) | + (((uint64_t)cpdu->cbu_bridgeaddr[4]) << 8) | + (((uint64_t)cpdu->cbu_bridgeaddr[5]) << 0); - BSTP_LOCK_ASSERT(bs); + 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; - LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { - if (bstp_designated_port(bs, bp)) - continue; - if (bp->bp_state == BSTP_IFSTATE_DISABLED) - continue; - if (bp->bp_designated_root >= bs->bs_bridge_id) - continue; - if (root_port == NULL) - goto set_port; + /* 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; - if (bp->bp_designated_root < root_port->bp_designated_root) - goto set_port; - if (bp->bp_designated_root > root_port->bp_designated_root) - continue; + case BSTP_PROTO_RSTP: + flags &= BSTP_PDU_RSTPMASK; + break; + } - if ((bp->bp_designated_cost + bp->bp_path_cost) < - (root_port->bp_designated_cost + root_port->bp_path_cost)) - goto set_port; - if ((bp->bp_designated_cost + bp->bp_path_cost) > - (root_port->bp_designated_cost + root_port->bp_path_cost)) - continue; + 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; - if (bp->bp_designated_bridge < - root_port->bp_designated_bridge) - goto set_port; - if (bp->bp_designated_bridge > - root_port->bp_designated_bridge) - continue; - - if (bp->bp_designated_port < root_port->bp_designated_port) - goto set_port; - if (bp->bp_designated_port > root_port->bp_designated_port) - continue; - - if (bp->bp_port_id >= root_port->bp_port_id) - continue; -set_port: - root_port = bp; + 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; } - - bs->bs_root_port = root_port; - if (root_port == NULL) { - bs->bs_designated_root = bs->bs_bridge_id; - bs->bs_root_path_cost = 0; - } else { - bs->bs_designated_root = root_port->bp_designated_root; - bs->bs_root_path_cost = root_port->bp_designated_cost + - root_port->bp_path_cost; - } } static void -bstp_designated_port_selection(struct bstp_state *bs) +bstp_send_bpdu(struct bstp_state *bs, struct bstp_port *bp, + struct bstp_cbpdu *bpdu) { - struct bstp_port *bp; + struct ifnet *ifp; + struct mbuf *m; + struct ether_header *eh; BSTP_LOCK_ASSERT(bs); - LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { - if (bstp_designated_port(bs, bp)) - goto designated; - if (bp->bp_designated_root != bs->bs_designated_root) - goto designated; + ifp = bp->bp_ifp; - if (bs->bs_root_path_cost < bp->bp_designated_cost) - goto designated; - if (bs->bs_root_path_cost > bp->bp_designated_cost) - continue; + if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) + return; - if (bs->bs_bridge_id < bp->bp_designated_bridge) - goto designated; - if (bs->bs_bridge_id > bp->bp_designated_bridge) - continue; + MGETHDR(m, M_DONTWAIT, MT_DATA); + if (m == NULL) + return; - if (bp->bp_port_id > bp->bp_designated_port) - continue; -designated: - bstp_become_designated_port(bs, bp); - } -} + eh = mtod(m, struct ether_header *); -static void -bstp_become_designated_port(struct bstp_state *bs, struct bstp_port *bp) -{ - BSTP_LOCK_ASSERT(bs); + bpdu->cbu_ssap = bpdu->cbu_dsap = LLC_8021D_LSAP; + bpdu->cbu_ctl = LLC_UI; + bpdu->cbu_protoid = htons(BSTP_PROTO_ID); - bp->bp_designated_root = bs->bs_designated_root; - bp->bp_designated_cost = bs->bs_root_path_cost; - bp->bp_designated_bridge = bs->bs_bridge_id; - bp->bp_designated_port = bp->bp_port_id; -} + memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN); + memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN); -static void -bstp_port_state_selection(struct bstp_state *bs) -{ - struct bstp_port *bp; + 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; - BSTP_LOCK_ASSERT(bs); + 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; - LIST_FOREACH(bp, &bs->bs_bplist, bp_next) { - if (bp == bs->bs_root_port) { - bp->bp_config_pending = 0; - bp->bp_topology_change_acknowledge = 0; - bstp_make_forwarding(bs, bp); - } else if (bstp_designated_port(bs, bp)) { - bstp_timer_stop(&bp->bp_message_age_timer); - bstp_make_forwarding(bs, bp); - } else { - bp->bp_config_pending = 0; - bp->bp_topology_change_acknowledge = 0; - bstp_make_blocking(bs, bp); - } + default: + panic("not implemented"); } + m->m_pkthdr.rcvif = ifp; + m->m_len = m->m_pkthdr.len; + + bp->bp_txcount++; + bstp_enqueue(ifp, m); } static void -bstp_make_forwarding(struct bstp_state *bs, struct bstp_port *bp) +bstp_enqueue(struct ifnet *dst_ifp, struct mbuf *m) { - BSTP_LOCK_ASSERT(bs); + int err = 0; - if (bp->bp_state == BSTP_IFSTATE_BLOCKING) { - bstp_set_port_state(bp, BSTP_IFSTATE_LISTENING); - bstp_timer_start(&bp->bp_forward_delay_timer, 0); - } -} + IFQ_ENQUEUE(&dst_ifp->if_snd, m, err); -static void -bstp_make_blocking(struct bstp_state *bs, struct bstp_port *bp) -{ - BSTP_LOCK_ASSERT(bs); - - if ((bp->bp_state != BSTP_IFSTATE_DISABLED) && - (bp->bp_state != BSTP_IFSTATE_BLOCKING)) { - if ((bp->bp_state == BSTP_IFSTATE_FORWARDING) || - (bp->bp_state == BSTP_IFSTATE_LEARNING)) { - if (bp->bp_change_detection_enabled) { - bstp_topology_change_detection(bs); - } - } - bstp_set_port_state(bp, BSTP_IFSTATE_BLOCKING); - bstp_timer_stop(&bp->bp_forward_delay_timer); - } + if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0) + (*dst_ifp->if_start)(dst_ifp); } -static void -bstp_set_port_state(struct bstp_port *bp, uint8_t state) +static int +bstp_pdu_flags(struct bstp_port *bp) { - struct bstp_state *bs = bp->bp_bs; + int flags = 0; - bp->bp_state = state; + if (bp->bp_proposing && bp->bp_state != BSTP_IFSTATE_FORWARDING) + flags |= BSTP_PDU_F_P; - /* notify the parent bridge */ - if (bs->bs_state_cb != NULL) - taskqueue_enqueue(taskqueue_swi, &bp->bp_statetask); -} + if (bp->bp_agree) + flags |= BSTP_PDU_F_A; -/* - * Notify the bridge that a port state has changed, we need to do this from a - * taskqueue to avoid a LOR. - */ -static void -bstp_state_change(void *arg, int pending) -{ - struct bstp_port *bp = (struct bstp_port *)arg; - struct bstp_state *bs = bp->bp_bs; + if (bp->bp_tc_timer.active) + flags |= BSTP_PDU_F_TC; - if (bp->bp_active == 1) - (*bs->bs_state_cb)(bp->bp_ifp, bp->bp_state); -} + if (bp->bp_tc_ack) + flags |= BSTP_PDU_F_TCA; -static void -bstp_update_forward_transitions(struct bstp_port *bp) -{ - bp->bp_forward_transitions++; -} + switch (bp->bp_state) { + case BSTP_IFSTATE_LEARNING: + flags |= BSTP_PDU_F_L; + break; -static void -bstp_topology_change_detection(struct bstp_state *bs) -{ - BSTP_LOCK_ASSERT(bs); - - if (bstp_root_bridge(bs)) { - bs->bs_topology_change = 1; - bstp_timer_start(&bs->bs_topology_change_timer, 0); - } else if (!bs->bs_topology_change_detected) { - bstp_transmit_tcn(bs); - bstp_timer_start(&bs->bs_tcn_timer, 0); + case BSTP_IFSTATE_FORWARDING: + flags |= (BSTP_PDU_F_L | BSTP_PDU_F_F); + break; } - bs->bs_topology_change_detected = 1; - getmicrotime(&bs->bs_last_tc_time); -} -static void -bstp_topology_change_acknowledged(struct bstp_state *bs) -{ - BSTP_LOCK_ASSERT(bs); + switch (bp->bp_role) { + case BSTP_ROLE_ROOT: + flags |= + (BSTP_PDU_F_ROOT << BSTP_PDU_PRSHIFT); + break; - bs->bs_topology_change_detected = 0; - bstp_timer_stop(&bs->bs_tcn_timer); -} + case BSTP_ROLE_ALTERNATE: + case BSTP_ROLE_BACKUP: /* fall through */ + flags |= + (BSTP_PDU_F_ALT << BSTP_PDU_PRSHIFT); + break; -static void -bstp_acknowledge_topology_change(struct bstp_state *bs, - struct bstp_port *bp) -{ - BSTP_LOCK_ASSERT(bs); + case BSTP_ROLE_DESIGNATED: + flags |= + (BSTP_PDU_F_DESG << BSTP_PDU_PRSHIFT); + break; + } - bp->bp_topology_change_acknowledge = 1; - bstp_transmit_config(bs, bp); + /* 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 * @@ -594,9 +461,6 @@ struct bstp_state *bs = bp->bp_bs; struct ether_header *eh; struct bstp_tbpdu tpdu; - struct bstp_cbpdu cpdu; - struct bstp_config_unit cu; - struct bstp_tcn_unit tu; uint16_t len; if (bp->bp_active == 0) { @@ -622,59 +486,46 @@ memcpy(&tpdu, mtod(m, caddr_t), sizeof(tpdu)); + /* basic packet checks */ if (tpdu.tbu_dsap != LLC_8021D_LSAP || 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(bs, bp, &tu); - break; - case BSTP_MSGTYPE_CFG: - if (m->m_len < sizeof(cpdu) && - (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; - memcpy(&cpdu, mtod(m, caddr_t), sizeof(cpdu)); + } - cu.cu_rootid = - (((uint64_t)ntohs(cpdu.cbu_rootpri)) << 48) | - (((uint64_t)cpdu.cbu_rootaddr[0]) << 40) | - (((uint64_t)cpdu.cbu_rootaddr[1]) << 32) | - (((uint64_t)cpdu.cbu_rootaddr[2]) << 24) | - (((uint64_t)cpdu.cbu_rootaddr[3]) << 16) | - (((uint64_t)cpdu.cbu_rootaddr[4]) << 8) | - (((uint64_t)cpdu.cbu_rootaddr[5]) << 0); + /* 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); - cu.cu_bridge_id = - (((uint64_t)ntohs(cpdu.cbu_bridgepri)) << 48) | - (((uint64_t)cpdu.cbu_bridgeaddr[0]) << 40) | - (((uint64_t)cpdu.cbu_bridgeaddr[1]) << 32) | - (((uint64_t)cpdu.cbu_bridgeaddr[2]) << 24) | - (((uint64_t)cpdu.cbu_bridgeaddr[3]) << 16) | - (((uint64_t)cpdu.cbu_bridgeaddr[4]) << 8) | - (((uint64_t)cpdu.cbu_bridgeaddr[5]) << 0); + switch (tpdu.tbu_protover) { + case BSTP_PROTO_STP: + bstp_received_stp(bs, bp, m, &tpdu); + break; - 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(bs, bp, &cu); - break; - default: - goto out; + case BSTP_PROTO_RSTP: + bstp_received_rstp(bs, bp, m, &tpdu); + break; } - out: BSTP_UNLOCK(bs); if (m) @@ -683,441 +534,1199 @@ } static void -bstp_received_config_bpdu(struct bstp_state *bs, struct bstp_port *bp, +bstp_received_stp(struct bstp_state *bs, struct bstp_port *bp, + struct mbuf *m, 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 (m->m_len < BSTP_BPDU_STP_LEN && + (m = m_pullup(m, BSTP_BPDU_STP_LEN)) == NULL) + return; + memcpy(&cpdu, mtod(m, caddr_t), BSTP_BPDU_STP_LEN); + + bstp_decode_bpdu(bp, &cpdu, cu); + bstp_received_bpdu(bs, bp, cu); + break; + } +} + +static void +bstp_received_rstp(struct bstp_state *bs, struct bstp_port *bp, + struct mbuf *m, struct bstp_tbpdu *tpdu) +{ + struct bstp_cbpdu cpdu; + struct bstp_config_unit *cu = &bp->bp_msg_cu; + + if (tpdu->tbu_bpdutype != BSTP_MSGTYPE_RSTP) { + m_freem(m); + return; + } + + if (m->m_len < BSTP_BPDU_RSTP_LEN && + (m = m_pullup(m, BSTP_BPDU_RSTP_LEN)) == NULL) + return; + memcpy(&cpdu, mtod(m, caddr_t), BSTP_BPDU_RSTP_LEN); + + bstp_decode_bpdu(bp, &cpdu, cu); + bstp_received_bpdu(bs, bp, cu); +} + +static 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); +} + +static void +bstp_received_bpdu(struct bstp_state *bs, struct bstp_port *bp, struct bstp_config_unit *cu) { - int root; + int type; BSTP_LOCK_ASSERT(bs); - root = bstp_root_bridge(bs); + /* 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) { >>> TRUNCATED FOR MAIL (1000 lines) <<<
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