if_bridge.c revision 185895
1178354Ssam/* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2186904Ssam 3178354Ssam/* 4178354Ssam * Copyright 2001 Wasabi Systems, Inc. 5178354Ssam * All rights reserved. 6178354Ssam * 7178354Ssam * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8178354Ssam * 9178354Ssam * Redistribution and use in source and binary forms, with or without 10178354Ssam * modification, are permitted provided that the following conditions 11178354Ssam * are met: 12178354Ssam * 1. Redistributions of source code must retain the above copyright 13178354Ssam * notice, this list of conditions and the following disclaimer. 14178354Ssam * 2. Redistributions in binary form must reproduce the above copyright 15178354Ssam * notice, this list of conditions and the following disclaimer in the 16178354Ssam * documentation and/or other materials provided with the distribution. 17178354Ssam * 3. All advertising materials mentioning features or use of this software 18178354Ssam * must display the following acknowledgement: 19178354Ssam * This product includes software developed for the NetBSD Project by 20178354Ssam * Wasabi Systems, Inc. 21178354Ssam * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22178354Ssam * or promote products derived from this software without specific prior 23178354Ssam * written permission. 24178354Ssam * 25178354Ssam * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26178354Ssam * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27178354Ssam * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28178354Ssam * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29178354Ssam * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30189106Sbz * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31178354Ssam * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32178354Ssam * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33178354Ssam * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34178354Ssam * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35178354Ssam * POSSIBILITY OF SUCH DAMAGE. 36178354Ssam */ 37178354Ssam 38178354Ssam/* 39178354Ssam * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 40178354Ssam * All rights reserved. 41182144Sjulian * 42178354Ssam * Redistribution and use in source and binary forms, with or without 43178354Ssam * modification, are permitted provided that the following conditions 44178354Ssam * are met: 45178354Ssam * 1. Redistributions of source code must retain the above copyright 46178354Ssam * notice, this list of conditions and the following disclaimer. 47178354Ssam * 2. Redistributions in binary form must reproduce the above copyright 48189106Sbz * notice, this list of conditions and the following disclaimer in the 49185571Sbz * documentation and/or other materials provided with the distribution. 50178354Ssam * 51178354Ssam * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 52191551Ssam * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 53191551Ssam * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 54191551Ssam * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 55178354Ssam * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 56178354Ssam * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 57183355Sthompsa * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58178354Ssam * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 59191551Ssam * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 60191551Ssam * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 61183355Sthompsa * POSSIBILITY OF SUCH DAMAGE. 62191551Ssam * 63191551Ssam * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 64183355Sthompsa */ 65178354Ssam 66178354Ssam/* 67178354Ssam * Network interface bridge support. 68178354Ssam * 69178354Ssam * TODO: 70188182Ssam * 71188182Ssam * - Currently only supports Ethernet-like interfaces (Ethernet, 72178354Ssam * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 73178354Ssam * to bridge other types of interfaces (FDDI-FDDI, and maybe 74178354Ssam * consider heterogenous bridges). 75178354Ssam */ 76178354Ssam 77178354Ssam#include <sys/cdefs.h> 78178354Ssam__FBSDID("$FreeBSD: head/sys/net/if_bridge.c 185895 2008-12-10 23:12:39Z zec $"); 79178354Ssam 80178354Ssam#include "opt_inet.h" 81178354Ssam#include "opt_inet6.h" 82178354Ssam#include "opt_carp.h" 83178354Ssam 84178354Ssam#include <sys/param.h> 85178354Ssam#include <sys/mbuf.h> 86178354Ssam#include <sys/malloc.h> 87178354Ssam#include <sys/protosw.h> 88178354Ssam#include <sys/systm.h> 89178354Ssam#include <sys/time.h> 90178354Ssam#include <sys/socket.h> /* for net/if.h */ 91188182Ssam#include <sys/sockio.h> 92188182Ssam#include <sys/ctype.h> /* string functions */ 93188182Ssam#include <sys/kernel.h> 94188182Ssam#include <sys/random.h> 95188182Ssam#include <sys/syslog.h> 96188182Ssam#include <sys/sysctl.h> 97188182Ssam#include <vm/uma.h> 98188182Ssam#include <sys/module.h> 99188182Ssam#include <sys/priv.h> 100178354Ssam#include <sys/proc.h> 101178354Ssam#include <sys/lock.h> 102178354Ssam#include <sys/mutex.h> 103178354Ssam#include <sys/rwlock.h> 104178354Ssam#include <sys/vimage.h> 105178354Ssam 106178354Ssam#include <net/bpf.h> 107178354Ssam#include <net/if.h> 108178354Ssam#include <net/if_clone.h> 109178354Ssam#include <net/if_dl.h> 110178354Ssam#include <net/if_types.h> 111178354Ssam#include <net/if_var.h> 112178354Ssam#include <net/pfil.h> 113178354Ssam 114178354Ssam#include <netinet/in.h> /* for struct arpcom */ 115178354Ssam#include <netinet/in_systm.h> 116178354Ssam#include <netinet/in_var.h> 117178354Ssam#include <netinet/ip.h> 118178354Ssam#include <netinet/ip_var.h> 119178354Ssam#include <netinet/vinet.h> 120178354Ssam#ifdef INET6 121178354Ssam#include <netinet/ip6.h> 122178354Ssam#include <netinet6/ip6_var.h> 123178354Ssam#include <netinet6/vinet6.h> 124178354Ssam#endif 125178354Ssam#ifdef DEV_CARP 126178354Ssam#include <netinet/ip_carp.h> 127178354Ssam#endif 128178354Ssam#include <machine/in_cksum.h> 129178354Ssam#include <netinet/if_ether.h> /* for struct arpcom */ 130178354Ssam#include <net/bridgestp.h> 131178354Ssam#include <net/if_bridgevar.h> 132178354Ssam#include <net/if_llc.h> 133178354Ssam#include <net/if_vlan_var.h> 134178354Ssam 135178354Ssam#include <net/route.h> 136178354Ssam#include <netinet/ip_fw.h> 137178354Ssam#include <netinet/ip_dummynet.h> 138178354Ssam 139178354Ssam/* 140178354Ssam * Size of the route hash table. Must be a power of two. 141178354Ssam */ 142178354Ssam#ifndef BRIDGE_RTHASH_SIZE 143178354Ssam#define BRIDGE_RTHASH_SIZE 1024 144178354Ssam#endif 145178354Ssam 146178354Ssam#define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 147178354Ssam 148178354Ssam/* 149178354Ssam * Maximum number of addresses to cache. 150178354Ssam */ 151183550Szec#ifndef BRIDGE_RTABLE_MAX 152178354Ssam#define BRIDGE_RTABLE_MAX 100 153178354Ssam#endif 154178354Ssam 155178354Ssam/* 156178354Ssam * Timeout (in seconds) for entries learned dynamically. 157178354Ssam */ 158178354Ssam#ifndef BRIDGE_RTABLE_TIMEOUT 159178354Ssam#define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 160178354Ssam#endif 161178354Ssam 162183550Szec/* 163183550Szec * Number of seconds between walks of the route list. 164183550Szec */ 165183550Szec#ifndef BRIDGE_RTABLE_PRUNE_PERIOD 166183550Szec#define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 167178354Ssam#endif 168183550Szec 169183550Szec/* 170183550Szec * List of capabilities to possibly mask on the member interface. 171183550Szec */ 172183550Szec#define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM) 173183550Szec 174183550Szec/* 175183550Szec * Bridge interface list entry. 176183550Szec */ 177183550Szecstruct bridge_iflist { 178183550Szec LIST_ENTRY(bridge_iflist) bif_next; 179183550Szec struct ifnet *bif_ifp; /* member if */ 180183550Szec struct bstp_port bif_stp; /* STP state */ 181178354Ssam uint32_t bif_flags; /* member if flags */ 182178354Ssam int bif_savedcaps; /* saved capabilities */ 183178354Ssam uint32_t bif_addrmax; /* max # of addresses */ 184178354Ssam uint32_t bif_addrcnt; /* cur. # of addresses */ 185178354Ssam uint32_t bif_addrexceeded;/* # of address violations */ 186191551Ssam}; 187191551Ssam 188191551Ssam/* 189191551Ssam * Bridge route node. 190191551Ssam */ 191191551Ssamstruct bridge_rtnode { 192191551Ssam LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 193191551Ssam LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 194191551Ssam struct bridge_iflist *brt_dst; /* destination if */ 195191551Ssam unsigned long brt_expire; /* expiration time */ 196178354Ssam uint8_t brt_flags; /* address flags */ 197178354Ssam uint8_t brt_addr[ETHER_ADDR_LEN]; 198178354Ssam uint16_t brt_vlan; /* vlan id */ 199178354Ssam}; 200178354Ssam#define brt_ifp brt_dst->bif_ifp 201191551Ssam 202191551Ssam/* 203178354Ssam * Software state for each bridge. 204178354Ssam */ 205178354Ssamstruct bridge_softc { 206178354Ssam struct ifnet *sc_ifp; /* make this an interface */ 207178354Ssam LIST_ENTRY(bridge_softc) sc_list; 208191551Ssam struct mtx sc_mtx; 209191551Ssam struct cv sc_cv; 210191551Ssam uint32_t sc_brtmax; /* max # of addresses */ 211191551Ssam uint32_t sc_brtcnt; /* cur. # of addresses */ 212191551Ssam uint32_t sc_brttimeout; /* rt timeout in seconds */ 213191551Ssam struct callout sc_brcallout; /* bridge callout */ 214191551Ssam uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 215178354Ssam uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 216178354Ssam LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 217178354Ssam LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 218178354Ssam LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 219178354Ssam uint32_t sc_rthash_key; /* key for hash */ 220178354Ssam LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 221178354Ssam struct bstp_state sc_stp; /* STP state */ 222178354Ssam uint32_t sc_brtexceeded; /* # of cache drops */ 223178354Ssam u_char sc_defaddr[6]; /* Default MAC address */ 224178354Ssam}; 225178354Ssam 226178354Ssamstatic struct mtx bridge_list_mtx; 227178354Ssameventhandler_tag bridge_detach_cookie = NULL; 228178354Ssam 229178354Ssamint bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 230178354Ssam 231178354Ssamuma_zone_t bridge_rtnode_zone; 232178354Ssam 233178354Ssamstatic int bridge_clone_create(struct if_clone *, int, caddr_t); 234178354Ssamstatic void bridge_clone_destroy(struct ifnet *); 235178354Ssam 236178354Ssamstatic int bridge_ioctl(struct ifnet *, u_long, caddr_t); 237178354Ssamstatic void bridge_mutecaps(struct bridge_softc *); 238178354Ssamstatic void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 239178354Ssam int); 240178354Ssamstatic void bridge_ifdetach(void *arg __unused, struct ifnet *); 241178354Ssamstatic void bridge_init(void *); 242178354Ssamstatic void bridge_dummynet(struct mbuf *, struct ifnet *); 243178354Ssamstatic void bridge_stop(struct ifnet *, int); 244178354Ssamstatic void bridge_start(struct ifnet *); 245178354Ssamstatic struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 246178354Ssamstatic int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 247178354Ssam struct rtentry *); 248188170Ssamstatic void bridge_enqueue(struct bridge_softc *, struct ifnet *, 249178354Ssam struct mbuf *); 250178354Ssamstatic void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 251178354Ssam 252178354Ssamstatic void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 253178354Ssam struct mbuf *m); 254178354Ssam 255178354Ssamstatic void bridge_timer(void *); 256178354Ssam 257178354Ssamstatic void bridge_broadcast(struct bridge_softc *, struct ifnet *, 258178354Ssam struct mbuf *, int); 259178354Ssamstatic void bridge_span(struct bridge_softc *, struct mbuf *); 260178354Ssam 261178354Ssamstatic int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 262178354Ssam uint16_t, struct bridge_iflist *, int, uint8_t); 263178354Ssamstatic struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 264178354Ssam uint16_t); 265178354Ssamstatic void bridge_rttrim(struct bridge_softc *); 266182821Ssamstatic void bridge_rtage(struct bridge_softc *); 267182821Ssamstatic void bridge_rtflush(struct bridge_softc *, int); 268178354Ssamstatic int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 269178354Ssam uint16_t); 270178354Ssam 271178354Ssamstatic int bridge_rtable_init(struct bridge_softc *); 272178354Ssamstatic void bridge_rtable_fini(struct bridge_softc *); 273178354Ssam 274191551Ssamstatic int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 275191551Ssamstatic struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 276178354Ssam const uint8_t *, uint16_t); 277178354Ssamstatic int bridge_rtnode_insert(struct bridge_softc *, 278178354Ssam struct bridge_rtnode *); 279178354Ssamstatic void bridge_rtnode_destroy(struct bridge_softc *, 280178354Ssam struct bridge_rtnode *); 281178354Ssamstatic void bridge_rtable_expire(struct ifnet *, int); 282178354Ssamstatic void bridge_state_change(struct ifnet *, int); 283191551Ssam 284178354Ssamstatic struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 285191551Ssam const char *name); 286191551Ssamstatic struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 287191551Ssam struct ifnet *ifp); 288191551Ssamstatic void bridge_delete_member(struct bridge_softc *, 289191551Ssam struct bridge_iflist *, int); 290191551Ssamstatic void bridge_delete_span(struct bridge_softc *, 291191551Ssam struct bridge_iflist *); 292191551Ssam 293191551Ssamstatic int bridge_ioctl_add(struct bridge_softc *, void *); 294191551Ssamstatic int bridge_ioctl_del(struct bridge_softc *, void *); 295191551Ssamstatic int bridge_ioctl_gifflags(struct bridge_softc *, void *); 296191551Ssamstatic int bridge_ioctl_sifflags(struct bridge_softc *, void *); 297191551Ssamstatic int bridge_ioctl_scache(struct bridge_softc *, void *); 298191551Ssamstatic int bridge_ioctl_gcache(struct bridge_softc *, void *); 299191551Ssamstatic int bridge_ioctl_gifs(struct bridge_softc *, void *); 300191551Ssamstatic int bridge_ioctl_rts(struct bridge_softc *, void *); 301191551Ssamstatic int bridge_ioctl_saddr(struct bridge_softc *, void *); 302191551Ssamstatic int bridge_ioctl_sto(struct bridge_softc *, void *); 303191551Ssamstatic int bridge_ioctl_gto(struct bridge_softc *, void *); 304191551Ssamstatic int bridge_ioctl_daddr(struct bridge_softc *, void *); 305191551Ssamstatic int bridge_ioctl_flush(struct bridge_softc *, void *); 306191551Ssamstatic int bridge_ioctl_gpri(struct bridge_softc *, void *); 307191551Ssamstatic int bridge_ioctl_spri(struct bridge_softc *, void *); 308191551Ssamstatic int bridge_ioctl_ght(struct bridge_softc *, void *); 309191551Ssamstatic int bridge_ioctl_sht(struct bridge_softc *, void *); 310191551Ssamstatic int bridge_ioctl_gfd(struct bridge_softc *, void *); 311191551Ssamstatic int bridge_ioctl_sfd(struct bridge_softc *, void *); 312178354Ssamstatic int bridge_ioctl_gma(struct bridge_softc *, void *); 313178354Ssamstatic int bridge_ioctl_sma(struct bridge_softc *, void *); 314178354Ssamstatic int bridge_ioctl_sifprio(struct bridge_softc *, void *); 315178354Ssamstatic int bridge_ioctl_sifcost(struct bridge_softc *, void *); 316178354Ssamstatic int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 317178354Ssamstatic int bridge_ioctl_addspan(struct bridge_softc *, void *); 318178354Ssamstatic int bridge_ioctl_delspan(struct bridge_softc *, void *); 319178354Ssamstatic int bridge_ioctl_gbparam(struct bridge_softc *, void *); 320178354Ssamstatic int bridge_ioctl_grte(struct bridge_softc *, void *); 321178354Ssamstatic int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 322178354Ssamstatic int bridge_ioctl_sproto(struct bridge_softc *, void *); 323178354Ssamstatic int bridge_ioctl_stxhc(struct bridge_softc *, void *); 324191551Ssamstatic int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 325178354Ssam int); 326178354Ssamstatic int bridge_ip_checkbasic(struct mbuf **mp); 327178354Ssam#ifdef INET6 328178354Ssamstatic int bridge_ip6_checkbasic(struct mbuf **mp); 329178354Ssam#endif /* INET6 */ 330178354Ssamstatic int bridge_fragment(struct ifnet *, struct mbuf *, 331178354Ssam struct ether_header *, int, struct llc *); 332178354Ssam 333178354Ssam/* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 334178354Ssam#define VLANTAGOF(_m) \ 335178354Ssam (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 336178354Ssam 337178354Ssamstatic struct bstp_cb_ops bridge_ops = { 338178354Ssam .bcb_state = bridge_state_change, 339178354Ssam .bcb_rtage = bridge_rtable_expire 340178354Ssam}; 341178354Ssam 342178354SsamSYSCTL_DECL(_net_link); 343178354SsamSYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 344178354Ssam 345178354Ssamstatic int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 346178354Ssamstatic int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 347178354Ssamstatic int pfil_member = 1; /* run pfil hooks on the member interface */ 348178354Ssamstatic int pfil_ipfw = 0; /* layer2 filter with ipfw */ 349178354Ssamstatic int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 350178354Ssamstatic int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 351178354Ssam locally destined packets */ 352178354Ssamstatic int log_stp = 0; /* log STP state changes */ 353178354Ssamstatic int bridge_inherit_mac = 0; /* share MAC with first bridge member */ 354178354SsamSYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 355178354Ssam &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 356178354SsamSYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, 357178354Ssam &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 358178354SsamSYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 359178354Ssam &pfil_bridge, 0, "Packet filter on the bridge interface"); 360178354SsamSYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 361178354Ssam &pfil_member, 0, "Packet filter on the member interface"); 362178354SsamSYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, 363178354Ssam &pfil_local_phys, 0, 364178354Ssam "Packet filter on the physical interface for locally destined packets"); 365178354SsamSYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, 366178354Ssam &log_stp, 0, "Log STP state changes"); 367178354SsamSYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW, 368178354Ssam &bridge_inherit_mac, 0, 369178354Ssam "Inherit MAC address from the first bridge member"); 370178354Ssam 371178354Ssamstruct bridge_control { 372191551Ssam int (*bc_func)(struct bridge_softc *, void *); 373191551Ssam int bc_argsize; 374178354Ssam int bc_flags; 375178354Ssam}; 376178354Ssam 377178354Ssam#define BC_F_COPYIN 0x01 /* copy arguments in */ 378178354Ssam#define BC_F_COPYOUT 0x02 /* copy arguments out */ 379178354Ssam#define BC_F_SUSER 0x04 /* do super-user check */ 380178354Ssam 381178354Ssamconst struct bridge_control bridge_control_table[] = { 382178354Ssam { bridge_ioctl_add, sizeof(struct ifbreq), 383178354Ssam BC_F_COPYIN|BC_F_SUSER }, 384178354Ssam { bridge_ioctl_del, sizeof(struct ifbreq), 385178354Ssam BC_F_COPYIN|BC_F_SUSER }, 386178354Ssam 387178354Ssam { bridge_ioctl_gifflags, sizeof(struct ifbreq), 388178354Ssam BC_F_COPYIN|BC_F_COPYOUT }, 389178354Ssam { bridge_ioctl_sifflags, sizeof(struct ifbreq), 390178354Ssam BC_F_COPYIN|BC_F_SUSER }, 391178354Ssam 392178354Ssam { bridge_ioctl_scache, sizeof(struct ifbrparam), 393178354Ssam BC_F_COPYIN|BC_F_SUSER }, 394178354Ssam { bridge_ioctl_gcache, sizeof(struct ifbrparam), 395178354Ssam BC_F_COPYOUT }, 396178354Ssam 397178354Ssam { bridge_ioctl_gifs, sizeof(struct ifbifconf), 398178354Ssam BC_F_COPYIN|BC_F_COPYOUT }, 399178354Ssam { bridge_ioctl_rts, sizeof(struct ifbaconf), 400178354Ssam BC_F_COPYIN|BC_F_COPYOUT }, 401178354Ssam 402178354Ssam { bridge_ioctl_saddr, sizeof(struct ifbareq), 403178354Ssam BC_F_COPYIN|BC_F_SUSER }, 404178354Ssam 405178354Ssam { bridge_ioctl_sto, sizeof(struct ifbrparam), 406178354Ssam BC_F_COPYIN|BC_F_SUSER }, 407178354Ssam { bridge_ioctl_gto, sizeof(struct ifbrparam), 408178354Ssam BC_F_COPYOUT }, 409178354Ssam 410178354Ssam { bridge_ioctl_daddr, sizeof(struct ifbareq), 411178354Ssam BC_F_COPYIN|BC_F_SUSER }, 412178354Ssam 413178354Ssam { bridge_ioctl_flush, sizeof(struct ifbreq), 414178354Ssam BC_F_COPYIN|BC_F_SUSER }, 415178354Ssam 416178354Ssam { bridge_ioctl_gpri, sizeof(struct ifbrparam), 417178354Ssam BC_F_COPYOUT }, 418178354Ssam { bridge_ioctl_spri, sizeof(struct ifbrparam), 419178354Ssam BC_F_COPYIN|BC_F_SUSER }, 420178354Ssam 421178354Ssam { bridge_ioctl_ght, sizeof(struct ifbrparam), 422178354Ssam BC_F_COPYOUT }, 423178354Ssam { bridge_ioctl_sht, sizeof(struct ifbrparam), 424178354Ssam BC_F_COPYIN|BC_F_SUSER }, 425178354Ssam 426178354Ssam { bridge_ioctl_gfd, sizeof(struct ifbrparam), 427178354Ssam BC_F_COPYOUT }, 428178354Ssam { bridge_ioctl_sfd, sizeof(struct ifbrparam), 429178354Ssam BC_F_COPYIN|BC_F_SUSER }, 430178354Ssam 431178354Ssam { bridge_ioctl_gma, sizeof(struct ifbrparam), 432178354Ssam BC_F_COPYOUT }, 433178354Ssam { bridge_ioctl_sma, sizeof(struct ifbrparam), 434178354Ssam BC_F_COPYIN|BC_F_SUSER }, 435178354Ssam 436178354Ssam { bridge_ioctl_sifprio, sizeof(struct ifbreq), 437178354Ssam BC_F_COPYIN|BC_F_SUSER }, 438178354Ssam 439178354Ssam { bridge_ioctl_sifcost, sizeof(struct ifbreq), 440178354Ssam BC_F_COPYIN|BC_F_SUSER }, 441178354Ssam 442178354Ssam { bridge_ioctl_addspan, sizeof(struct ifbreq), 443178354Ssam BC_F_COPYIN|BC_F_SUSER }, 444178354Ssam { bridge_ioctl_delspan, sizeof(struct ifbreq), 445178354Ssam BC_F_COPYIN|BC_F_SUSER }, 446178354Ssam 447191551Ssam { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 448178354Ssam BC_F_COPYOUT }, 449178354Ssam 450178354Ssam { bridge_ioctl_grte, sizeof(struct ifbrparam), 451178354Ssam BC_F_COPYOUT }, 452178354Ssam 453191551Ssam { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 454191551Ssam BC_F_COPYIN|BC_F_COPYOUT }, 455191551Ssam 456191551Ssam { bridge_ioctl_sproto, sizeof(struct ifbrparam), 457178354Ssam BC_F_COPYIN|BC_F_SUSER }, 458191551Ssam 459191551Ssam { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 460191551Ssam BC_F_COPYIN|BC_F_SUSER }, 461191551Ssam 462191551Ssam { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 463191551Ssam BC_F_COPYIN|BC_F_SUSER }, 464191551Ssam 465191551Ssam}; 466191551Ssamconst int bridge_control_table_size = 467191551Ssam sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 468191551Ssam 469191551SsamLIST_HEAD(, bridge_softc) bridge_list; 470191551Ssam 471191551SsamIFC_SIMPLE_DECLARE(bridge, 0); 472178354Ssam 473178354Ssamstatic int 474178354Ssambridge_modevent(module_t mod, int type, void *data) 475178354Ssam{ 476178354Ssam 477178354Ssam switch (type) { 478178354Ssam case MOD_LOAD: 479178354Ssam mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 480178354Ssam if_clone_attach(&bridge_cloner); 481178354Ssam bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 482178354Ssam sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 483178354Ssam UMA_ALIGN_PTR, 0); 484191551Ssam LIST_INIT(&bridge_list); 485178354Ssam bridge_input_p = bridge_input; 486178354Ssam bridge_output_p = bridge_output; 487178354Ssam bridge_dn_p = bridge_dummynet; 488178354Ssam bridge_detach_cookie = EVENTHANDLER_REGISTER( 489178354Ssam ifnet_departure_event, bridge_ifdetach, NULL, 490178354Ssam EVENTHANDLER_PRI_ANY); 491178354Ssam break; 492178354Ssam case MOD_UNLOAD: 493178354Ssam EVENTHANDLER_DEREGISTER(ifnet_departure_event, 494178354Ssam bridge_detach_cookie); 495178354Ssam if_clone_detach(&bridge_cloner); 496178354Ssam uma_zdestroy(bridge_rtnode_zone); 497178354Ssam bridge_input_p = NULL; 498178354Ssam bridge_output_p = NULL; 499178354Ssam bridge_dn_p = NULL; 500187797Ssam mtx_destroy(&bridge_list_mtx); 501178354Ssam break; 502178354Ssam default: 503178354Ssam return (EOPNOTSUPP); 504178354Ssam } 505178354Ssam return (0); 506178354Ssam} 507178354Ssam 508178354Ssamstatic moduledata_t bridge_mod = { 509178354Ssam "if_bridge", 510178354Ssam bridge_modevent, 511178354Ssam 0 512178354Ssam}; 513178354Ssam 514178354SsamDECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 515178354SsamMODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 516178354Ssam 517178354Ssam/* 518178354Ssam * handler for net.link.bridge.pfil_ipfw 519178354Ssam */ 520178354Ssamstatic int 521178354Ssamsysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 522178354Ssam{ 523178354Ssam int enable = pfil_ipfw; 524178354Ssam int error; 525178354Ssam 526178354Ssam error = sysctl_handle_int(oidp, &enable, 0, req); 527178354Ssam enable = (enable) ? 1 : 0; 528178354Ssam 529178354Ssam if (enable != pfil_ipfw) { 530178354Ssam pfil_ipfw = enable; 531178354Ssam 532178354Ssam /* 533178354Ssam * Disable pfil so that ipfw doesnt run twice, if the user 534178354Ssam * really wants both then they can re-enable pfil_bridge and/or 535178354Ssam * pfil_member. Also allow non-ip packets as ipfw can filter by 536178354Ssam * layer2 type. 537178354Ssam */ 538178354Ssam if (pfil_ipfw) { 539178354Ssam pfil_onlyip = 0; 540178354Ssam pfil_bridge = 0; 541186107Ssam pfil_member = 0; 542178354Ssam } 543178354Ssam } 544178354Ssam 545178354Ssam return (error); 546178354Ssam} 547178354SsamSYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 548178354Ssam &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 549178354Ssam 550178354Ssam/* 551178354Ssam * bridge_clone_create: 552178354Ssam * 553178354Ssam * Create a new bridge instance. 554178354Ssam */ 555178354Ssamstatic int 556178354Ssambridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 557178354Ssam{ 558178354Ssam struct bridge_softc *sc, *sc2; 559178354Ssam struct ifnet *bifp, *ifp; 560178354Ssam int retry; 561178354Ssam 562178354Ssam sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 563178354Ssam ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 564178354Ssam if (ifp == NULL) { 565178354Ssam free(sc, M_DEVBUF); 566178354Ssam return (ENOSPC); 567178354Ssam } 568188182Ssam 569188182Ssam BRIDGE_LOCK_INIT(sc); 570178354Ssam sc->sc_brtmax = BRIDGE_RTABLE_MAX; 571188182Ssam sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 572188182Ssam 573178354Ssam /* Initialize our routing table. */ 574178354Ssam bridge_rtable_init(sc); 575178354Ssam 576178354Ssam callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 577178354Ssam 578178354Ssam LIST_INIT(&sc->sc_iflist); 579178354Ssam LIST_INIT(&sc->sc_spanlist); 580178354Ssam 581178354Ssam ifp->if_softc = sc; 582178354Ssam if_initname(ifp, ifc->ifc_name, unit); 583178354Ssam ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 584178354Ssam ifp->if_ioctl = bridge_ioctl; 585178354Ssam ifp->if_start = bridge_start; 586178354Ssam ifp->if_init = bridge_init; 587178354Ssam ifp->if_type = IFT_BRIDGE; 588178354Ssam IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 589191551Ssam ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 590191551Ssam IFQ_SET_READY(&ifp->if_snd); 591178354Ssam 592178354Ssam /* 593178354Ssam * Generate a random ethernet address with a locally administered 594178354Ssam * address. 595191551Ssam * 596191551Ssam * Since we are using random ethernet addresses for the bridge, it is 597191551Ssam * possible that we might have address collisions, so make sure that 598191551Ssam * this hardware address isn't already in use on another bridge. 599191551Ssam */ 600191551Ssam for (retry = 1; retry != 0;) { 601191551Ssam arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 602191551Ssam sc->sc_defaddr[0] &= ~1; /* clear multicast bit */ 603191551Ssam sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 604191551Ssam retry = 0; 605191551Ssam mtx_lock(&bridge_list_mtx); 606191551Ssam LIST_FOREACH(sc2, &bridge_list, sc_list) { 607191551Ssam bifp = sc2->sc_ifp; 608191551Ssam if (memcmp(sc->sc_defaddr, 609191551Ssam IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) 610191551Ssam retry = 1; 611191551Ssam } 612191551Ssam mtx_unlock(&bridge_list_mtx); 613191551Ssam } 614191551Ssam 615191551Ssam bstp_attach(&sc->sc_stp, &bridge_ops); 616191551Ssam ether_ifattach(ifp, sc->sc_defaddr); 617191551Ssam /* Now undo some of the damage... */ 618191551Ssam ifp->if_baudrate = 0; 619178354Ssam ifp->if_type = IFT_BRIDGE; 620178354Ssam 621178354Ssam mtx_lock(&bridge_list_mtx); 622178354Ssam LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 623178354Ssam mtx_unlock(&bridge_list_mtx); 624178354Ssam 625178354Ssam return (0); 626178354Ssam} 627178354Ssam 628178354Ssam/* 629178354Ssam * bridge_clone_destroy: 630178354Ssam * 631178354Ssam * Destroy a bridge instance. 632178354Ssam */ 633178354Ssamstatic void 634178354Ssambridge_clone_destroy(struct ifnet *ifp) 635178354Ssam{ 636178354Ssam struct bridge_softc *sc = ifp->if_softc; 637188182Ssam struct bridge_iflist *bif; 638188182Ssam 639188182Ssam BRIDGE_LOCK(sc); 640188182Ssam 641188182Ssam bridge_stop(ifp, 1); 642188182Ssam ifp->if_flags &= ~IFF_UP; 643188182Ssam 644188182Ssam while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 645188182Ssam bridge_delete_member(sc, bif, 0); 646188182Ssam 647188182Ssam while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 648188182Ssam bridge_delete_span(sc, bif); 649188182Ssam } 650188182Ssam 651188182Ssam BRIDGE_UNLOCK(sc); 652188182Ssam 653188182Ssam callout_drain(&sc->sc_brcallout); 654188182Ssam 655188182Ssam mtx_lock(&bridge_list_mtx); 656188182Ssam LIST_REMOVE(sc, sc_list); 657178354Ssam mtx_unlock(&bridge_list_mtx); 658178354Ssam 659178354Ssam bstp_detach(&sc->sc_stp); 660178354Ssam ether_ifdetach(ifp); 661178354Ssam if_free_type(ifp, IFT_ETHER); 662178354Ssam 663178354Ssam /* Tear down the routing table. */ 664178354Ssam bridge_rtable_fini(sc); 665188182Ssam 666178354Ssam BRIDGE_LOCK_DESTROY(sc); 667178354Ssam free(sc, M_DEVBUF); 668178354Ssam} 669178354Ssam 670178354Ssam/* 671178354Ssam * bridge_ioctl: 672178354Ssam * 673178354Ssam * Handle a control request from the operator. 674178354Ssam */ 675178354Ssamstatic int 676178354Ssambridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 677178354Ssam{ 678178354Ssam struct bridge_softc *sc = ifp->if_softc; 679178354Ssam struct thread *td = curthread; 680178354Ssam union { 681178354Ssam struct ifbreq ifbreq; 682178354Ssam struct ifbifconf ifbifconf; 683178354Ssam struct ifbareq ifbareq; 684178354Ssam struct ifbaconf ifbaconf; 685178354Ssam struct ifbrparam ifbrparam; 686178354Ssam struct ifbropreq ifbropreq; 687178354Ssam } args; 688178354Ssam struct ifdrv *ifd = (struct ifdrv *) data; 689178354Ssam const struct bridge_control *bc; 690178354Ssam int error = 0; 691178354Ssam 692178354Ssam switch (cmd) { 693178354Ssam 694178354Ssam case SIOCADDMULTI: 695178354Ssam case SIOCDELMULTI: 696178354Ssam break; 697178354Ssam 698178354Ssam case SIOCGDRVSPEC: 699178354Ssam case SIOCSDRVSPEC: 700178354Ssam if (ifd->ifd_cmd >= bridge_control_table_size) { 701178354Ssam error = EINVAL; 702178354Ssam break; 703178354Ssam } 704178354Ssam bc = &bridge_control_table[ifd->ifd_cmd]; 705178354Ssam 706178354Ssam if (cmd == SIOCGDRVSPEC && 707178354Ssam (bc->bc_flags & BC_F_COPYOUT) == 0) { 708178354Ssam error = EINVAL; 709178354Ssam break; 710178354Ssam } 711178354Ssam else if (cmd == SIOCSDRVSPEC && 712178354Ssam (bc->bc_flags & BC_F_COPYOUT) != 0) { 713178354Ssam error = EINVAL; 714178354Ssam break; 715178354Ssam } 716178354Ssam 717178354Ssam if (bc->bc_flags & BC_F_SUSER) { 718178354Ssam error = priv_check(td, PRIV_NET_BRIDGE); 719178354Ssam if (error) 720178354Ssam break; 721178354Ssam } 722178354Ssam 723178354Ssam if (ifd->ifd_len != bc->bc_argsize || 724182822Ssam ifd->ifd_len > sizeof(args)) { 725178354Ssam error = EINVAL; 726178354Ssam break; 727178354Ssam } 728178354Ssam 729178354Ssam bzero(&args, sizeof(args)); 730178354Ssam if (bc->bc_flags & BC_F_COPYIN) { 731182822Ssam error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 732178354Ssam if (error) 733178354Ssam break; 734182822Ssam } 735178354Ssam 736178354Ssam BRIDGE_LOCK(sc); 737182822Ssam error = (*bc->bc_func)(sc, &args); 738178354Ssam BRIDGE_UNLOCK(sc); 739178354Ssam if (error) 740182822Ssam break; 741178354Ssam 742178354Ssam if (bc->bc_flags & BC_F_COPYOUT) 743182822Ssam error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 744178354Ssam 745178354Ssam break; 746178354Ssam 747182822Ssam case SIOCSIFFLAGS: 748178354Ssam if (!(ifp->if_flags & IFF_UP) && 749178354Ssam (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 750188170Ssam /* 751188170Ssam * If interface is marked down and it is running, 752178354Ssam * then stop and disable it. 753178354Ssam */ 754178354Ssam BRIDGE_LOCK(sc); 755178354Ssam bridge_stop(ifp, 1); 756178354Ssam BRIDGE_UNLOCK(sc); 757178354Ssam } else if ((ifp->if_flags & IFF_UP) && 758178354Ssam !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 759178354Ssam /* 760178354Ssam * If interface is marked up and it is stopped, then 761178354Ssam * start it. 762178354Ssam */ 763178354Ssam (*ifp->if_init)(sc); 764178354Ssam } 765188170Ssam break; 766178354Ssam 767188170Ssam case SIOCSIFMTU: 768178354Ssam /* Do not allow the MTU to be changed on the bridge */ 769178354Ssam error = EINVAL; 770178354Ssam break; 771178354Ssam 772178354Ssam default: 773178354Ssam /* 774178354Ssam * drop the lock as ether_ioctl() will call bridge_start() and 775178354Ssam * cause the lock to be recursed. 776178354Ssam */ 777178354Ssam error = ether_ioctl(ifp, cmd, data); 778178354Ssam break; 779178354Ssam } 780178354Ssam 781178354Ssam return (error); 782178354Ssam} 783178354Ssam 784178354Ssam/* 785178354Ssam * bridge_mutecaps: 786178354Ssam * 787178354Ssam * Clear or restore unwanted capabilities on the member interface 788178354Ssam */ 789178354Ssamstatic void 790178354Ssambridge_mutecaps(struct bridge_softc *sc) 791178354Ssam{ 792178354Ssam struct bridge_iflist *bif; 793178354Ssam int enabled, mask; 794178354Ssam 795178354Ssam /* Initial bitmask of capabilities to test */ 796178354Ssam mask = BRIDGE_IFCAPS_MASK; 797178354Ssam 798178354Ssam LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 799178354Ssam /* Every member must support it or its disabled */ 800178354Ssam mask &= bif->bif_savedcaps; 801178354Ssam } 802178354Ssam 803178354Ssam LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 804178354Ssam enabled = bif->bif_ifp->if_capenable; 805178354Ssam /* strip off mask bits and enable them again if allowed */ 806178354Ssam enabled &= ~BRIDGE_IFCAPS_MASK; 807178354Ssam enabled |= mask; 808178354Ssam /* 809178354Ssam * Receive offload can only be enabled if all members also 810178354Ssam * support send offload. 811178354Ssam */ 812178354Ssam if ((enabled & IFCAP_TSO) == 0) 813 enabled &= ~IFCAP_LRO; 814 815 bridge_set_ifcap(sc, bif, enabled); 816 } 817 818} 819 820static void 821bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 822{ 823 struct ifnet *ifp = bif->bif_ifp; 824 struct ifreq ifr; 825 int error; 826 827 bzero(&ifr, sizeof(ifr)); 828 ifr.ifr_reqcap = set; 829 830 if (ifp->if_capenable != set) { 831 IFF_LOCKGIANT(ifp); 832 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 833 IFF_UNLOCKGIANT(ifp); 834 if (error) 835 if_printf(sc->sc_ifp, 836 "error setting interface capabilities on %s\n", 837 ifp->if_xname); 838 } 839} 840 841/* 842 * bridge_lookup_member: 843 * 844 * Lookup a bridge member interface. 845 */ 846static struct bridge_iflist * 847bridge_lookup_member(struct bridge_softc *sc, const char *name) 848{ 849 struct bridge_iflist *bif; 850 struct ifnet *ifp; 851 852 BRIDGE_LOCK_ASSERT(sc); 853 854 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 855 ifp = bif->bif_ifp; 856 if (strcmp(ifp->if_xname, name) == 0) 857 return (bif); 858 } 859 860 return (NULL); 861} 862 863/* 864 * bridge_lookup_member_if: 865 * 866 * Lookup a bridge member interface by ifnet*. 867 */ 868static struct bridge_iflist * 869bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 870{ 871 struct bridge_iflist *bif; 872 873 BRIDGE_LOCK_ASSERT(sc); 874 875 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 876 if (bif->bif_ifp == member_ifp) 877 return (bif); 878 } 879 880 return (NULL); 881} 882 883/* 884 * bridge_delete_member: 885 * 886 * Delete the specified member interface. 887 */ 888static void 889bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 890 int gone) 891{ 892 struct ifnet *ifs = bif->bif_ifp; 893 struct ifnet *fif = NULL; 894 895 BRIDGE_LOCK_ASSERT(sc); 896 897 if (!gone) { 898 switch (ifs->if_type) { 899 case IFT_ETHER: 900 case IFT_L2VLAN: 901 /* 902 * Take the interface out of promiscuous mode. 903 */ 904 (void) ifpromisc(ifs, 0); 905 break; 906 907 case IFT_GIF: 908 break; 909 910 default: 911#ifdef DIAGNOSTIC 912 panic("bridge_delete_member: impossible"); 913#endif 914 break; 915 } 916 /* reneable any interface capabilities */ 917 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 918 } 919 920 if (bif->bif_flags & IFBIF_STP) 921 bstp_disable(&bif->bif_stp); 922 923 ifs->if_bridge = NULL; 924 BRIDGE_XLOCK(sc); 925 LIST_REMOVE(bif, bif_next); 926 BRIDGE_XDROP(sc); 927 928 /* 929 * If removing the interface that gave the bridge its mac address, set 930 * the mac address of the bridge to the address of the next member, or 931 * to its default address if no members are left. 932 */ 933 if (bridge_inherit_mac && 934 !memcmp(IF_LLADDR(sc->sc_ifp), IF_LLADDR(ifs), ETHER_ADDR_LEN)) { 935 if (LIST_EMPTY(&sc->sc_iflist)) 936 bcopy(sc->sc_defaddr, 937 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 938 else { 939 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 940 bcopy(IF_LLADDR(fif), 941 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 942 } 943 } 944 945 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 946 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 947 KASSERT(bif->bif_addrcnt == 0, 948 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 949 950 BRIDGE_UNLOCK(sc); 951 bstp_destroy(&bif->bif_stp); /* prepare to free */ 952 BRIDGE_LOCK(sc); 953 free(bif, M_DEVBUF); 954} 955 956/* 957 * bridge_delete_span: 958 * 959 * Delete the specified span interface. 960 */ 961static void 962bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 963{ 964 BRIDGE_LOCK_ASSERT(sc); 965 966 KASSERT(bif->bif_ifp->if_bridge == NULL, 967 ("%s: not a span interface", __func__)); 968 969 LIST_REMOVE(bif, bif_next); 970 free(bif, M_DEVBUF); 971} 972 973static int 974bridge_ioctl_add(struct bridge_softc *sc, void *arg) 975{ 976 struct ifbreq *req = arg; 977 struct bridge_iflist *bif = NULL; 978 struct ifnet *ifs; 979 int error = 0; 980 981 ifs = ifunit(req->ifbr_ifsname); 982 if (ifs == NULL) 983 return (ENOENT); 984 if (ifs->if_ioctl == NULL) /* must be supported */ 985 return (EINVAL); 986 987 /* If it's in the span list, it can't be a member. */ 988 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 989 if (ifs == bif->bif_ifp) 990 return (EBUSY); 991 992 /* Allow the first Ethernet member to define the MTU */ 993 if (ifs->if_type != IFT_GIF) { 994 if (LIST_EMPTY(&sc->sc_iflist)) 995 sc->sc_ifp->if_mtu = ifs->if_mtu; 996 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 997 if_printf(sc->sc_ifp, "invalid MTU for %s\n", 998 ifs->if_xname); 999 return (EINVAL); 1000 } 1001 } 1002 1003 if (ifs->if_bridge == sc) 1004 return (EEXIST); 1005 1006 if (ifs->if_bridge != NULL) 1007 return (EBUSY); 1008 1009 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1010 if (bif == NULL) 1011 return (ENOMEM); 1012 1013 bif->bif_ifp = ifs; 1014 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1015 bif->bif_savedcaps = ifs->if_capenable; 1016 1017 switch (ifs->if_type) { 1018 case IFT_ETHER: 1019 case IFT_L2VLAN: 1020 /* 1021 * Place the interface into promiscuous mode. 1022 */ 1023 error = ifpromisc(ifs, 1); 1024 if (error) 1025 goto out; 1026 break; 1027 1028 case IFT_GIF: 1029 break; 1030 1031 default: 1032 error = EINVAL; 1033 goto out; 1034 } 1035 1036 /* 1037 * Assign the interface's MAC address to the bridge if it's the first 1038 * member and the MAC address of the bridge has not been changed from 1039 * the default randomly generated one. 1040 */ 1041 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1042 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) 1043 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1044 1045 ifs->if_bridge = sc; 1046 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1047 /* 1048 * XXX: XLOCK HERE!?! 1049 * 1050 * NOTE: insert_***HEAD*** should be safe for the traversals. 1051 */ 1052 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1053 1054 /* Set interface capabilities to the intersection set of all members */ 1055 bridge_mutecaps(sc); 1056out: 1057 if (error) { 1058 if (bif != NULL) 1059 free(bif, M_DEVBUF); 1060 } 1061 return (error); 1062} 1063 1064static int 1065bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1066{ 1067 struct ifbreq *req = arg; 1068 struct bridge_iflist *bif; 1069 1070 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1071 if (bif == NULL) 1072 return (ENOENT); 1073 1074 bridge_delete_member(sc, bif, 0); 1075 1076 return (0); 1077} 1078 1079static int 1080bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1081{ 1082 struct ifbreq *req = arg; 1083 struct bridge_iflist *bif; 1084 struct bstp_port *bp; 1085 1086 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1087 if (bif == NULL) 1088 return (ENOENT); 1089 1090 bp = &bif->bif_stp; 1091 req->ifbr_ifsflags = bif->bif_flags; 1092 req->ifbr_state = bp->bp_state; 1093 req->ifbr_priority = bp->bp_priority; 1094 req->ifbr_path_cost = bp->bp_path_cost; 1095 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1096 req->ifbr_proto = bp->bp_protover; 1097 req->ifbr_role = bp->bp_role; 1098 req->ifbr_stpflags = bp->bp_flags; 1099 req->ifbr_addrcnt = bif->bif_addrcnt; 1100 req->ifbr_addrmax = bif->bif_addrmax; 1101 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1102 1103 /* Copy STP state options as flags */ 1104 if (bp->bp_operedge) 1105 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1106 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1107 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1108 if (bp->bp_ptp_link) 1109 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1110 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1111 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1112 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1113 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1114 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1115 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1116 return (0); 1117} 1118 1119static int 1120bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1121{ 1122 struct ifbreq *req = arg; 1123 struct bridge_iflist *bif; 1124 struct bstp_port *bp; 1125 int error; 1126 1127 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1128 if (bif == NULL) 1129 return (ENOENT); 1130 bp = &bif->bif_stp; 1131 1132 if (req->ifbr_ifsflags & IFBIF_SPAN) 1133 /* SPAN is readonly */ 1134 return (EINVAL); 1135 1136 if (req->ifbr_ifsflags & IFBIF_STP) { 1137 if ((bif->bif_flags & IFBIF_STP) == 0) { 1138 error = bstp_enable(&bif->bif_stp); 1139 if (error) 1140 return (error); 1141 } 1142 } else { 1143 if ((bif->bif_flags & IFBIF_STP) != 0) 1144 bstp_disable(&bif->bif_stp); 1145 } 1146 1147 /* Pass on STP flags */ 1148 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1149 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1150 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1151 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1152 1153 /* Save the bits relating to the bridge */ 1154 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1155 1156 return (0); 1157} 1158 1159static int 1160bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1161{ 1162 struct ifbrparam *param = arg; 1163 1164 sc->sc_brtmax = param->ifbrp_csize; 1165 bridge_rttrim(sc); 1166 1167 return (0); 1168} 1169 1170static int 1171bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1172{ 1173 struct ifbrparam *param = arg; 1174 1175 param->ifbrp_csize = sc->sc_brtmax; 1176 1177 return (0); 1178} 1179 1180static int 1181bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1182{ 1183 struct ifbifconf *bifc = arg; 1184 struct bridge_iflist *bif; 1185 struct ifbreq breq; 1186 char *buf, *outbuf; 1187 int count, buflen, len, error = 0; 1188 1189 count = 0; 1190 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1191 count++; 1192 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1193 count++; 1194 1195 buflen = sizeof(breq) * count; 1196 if (bifc->ifbic_len == 0) { 1197 bifc->ifbic_len = buflen; 1198 return (0); 1199 } 1200 BRIDGE_UNLOCK(sc); 1201 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1202 BRIDGE_LOCK(sc); 1203 1204 count = 0; 1205 buf = outbuf; 1206 len = min(bifc->ifbic_len, buflen); 1207 bzero(&breq, sizeof(breq)); 1208 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1209 if (len < sizeof(breq)) 1210 break; 1211 1212 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1213 sizeof(breq.ifbr_ifsname)); 1214 /* Fill in the ifbreq structure */ 1215 error = bridge_ioctl_gifflags(sc, &breq); 1216 if (error) 1217 break; 1218 memcpy(buf, &breq, sizeof(breq)); 1219 count++; 1220 buf += sizeof(breq); 1221 len -= sizeof(breq); 1222 } 1223 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1224 if (len < sizeof(breq)) 1225 break; 1226 1227 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1228 sizeof(breq.ifbr_ifsname)); 1229 breq.ifbr_ifsflags = bif->bif_flags; 1230 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1231 memcpy(buf, &breq, sizeof(breq)); 1232 count++; 1233 buf += sizeof(breq); 1234 len -= sizeof(breq); 1235 } 1236 1237 BRIDGE_UNLOCK(sc); 1238 bifc->ifbic_len = sizeof(breq) * count; 1239 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1240 BRIDGE_LOCK(sc); 1241 free(outbuf, M_TEMP); 1242 return (error); 1243} 1244 1245static int 1246bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1247{ 1248 struct ifbaconf *bac = arg; 1249 struct bridge_rtnode *brt; 1250 struct ifbareq bareq; 1251 char *buf, *outbuf; 1252 int count, buflen, len, error = 0; 1253 1254 if (bac->ifbac_len == 0) 1255 return (0); 1256 1257 count = 0; 1258 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1259 count++; 1260 buflen = sizeof(bareq) * count; 1261 1262 BRIDGE_UNLOCK(sc); 1263 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1264 BRIDGE_LOCK(sc); 1265 1266 count = 0; 1267 buf = outbuf; 1268 len = min(bac->ifbac_len, buflen); 1269 bzero(&bareq, sizeof(bareq)); 1270 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1271 if (len < sizeof(bareq)) 1272 goto out; 1273 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1274 sizeof(bareq.ifba_ifsname)); 1275 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1276 bareq.ifba_vlan = brt->brt_vlan; 1277 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1278 time_uptime < brt->brt_expire) 1279 bareq.ifba_expire = brt->brt_expire - time_uptime; 1280 else 1281 bareq.ifba_expire = 0; 1282 bareq.ifba_flags = brt->brt_flags; 1283 1284 memcpy(buf, &bareq, sizeof(bareq)); 1285 count++; 1286 buf += sizeof(bareq); 1287 len -= sizeof(bareq); 1288 } 1289out: 1290 BRIDGE_UNLOCK(sc); 1291 bac->ifbac_len = sizeof(bareq) * count; 1292 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1293 BRIDGE_LOCK(sc); 1294 free(outbuf, M_TEMP); 1295 return (error); 1296} 1297 1298static int 1299bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1300{ 1301 struct ifbareq *req = arg; 1302 struct bridge_iflist *bif; 1303 int error; 1304 1305 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1306 if (bif == NULL) 1307 return (ENOENT); 1308 1309 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1310 req->ifba_flags); 1311 1312 return (error); 1313} 1314 1315static int 1316bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1317{ 1318 struct ifbrparam *param = arg; 1319 1320 sc->sc_brttimeout = param->ifbrp_ctime; 1321 return (0); 1322} 1323 1324static int 1325bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1326{ 1327 struct ifbrparam *param = arg; 1328 1329 param->ifbrp_ctime = sc->sc_brttimeout; 1330 return (0); 1331} 1332 1333static int 1334bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1335{ 1336 struct ifbareq *req = arg; 1337 1338 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1339} 1340 1341static int 1342bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1343{ 1344 struct ifbreq *req = arg; 1345 1346 bridge_rtflush(sc, req->ifbr_ifsflags); 1347 return (0); 1348} 1349 1350static int 1351bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1352{ 1353 struct ifbrparam *param = arg; 1354 struct bstp_state *bs = &sc->sc_stp; 1355 1356 param->ifbrp_prio = bs->bs_bridge_priority; 1357 return (0); 1358} 1359 1360static int 1361bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1362{ 1363 struct ifbrparam *param = arg; 1364 1365 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1366} 1367 1368static int 1369bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1370{ 1371 struct ifbrparam *param = arg; 1372 struct bstp_state *bs = &sc->sc_stp; 1373 1374 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1375 return (0); 1376} 1377 1378static int 1379bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1380{ 1381 struct ifbrparam *param = arg; 1382 1383 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1384} 1385 1386static int 1387bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1388{ 1389 struct ifbrparam *param = arg; 1390 struct bstp_state *bs = &sc->sc_stp; 1391 1392 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1393 return (0); 1394} 1395 1396static int 1397bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1398{ 1399 struct ifbrparam *param = arg; 1400 1401 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1402} 1403 1404static int 1405bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1406{ 1407 struct ifbrparam *param = arg; 1408 struct bstp_state *bs = &sc->sc_stp; 1409 1410 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1411 return (0); 1412} 1413 1414static int 1415bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1416{ 1417 struct ifbrparam *param = arg; 1418 1419 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1420} 1421 1422static int 1423bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1424{ 1425 struct ifbreq *req = arg; 1426 struct bridge_iflist *bif; 1427 1428 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1429 if (bif == NULL) 1430 return (ENOENT); 1431 1432 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1433} 1434 1435static int 1436bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1437{ 1438 struct ifbreq *req = arg; 1439 struct bridge_iflist *bif; 1440 1441 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1442 if (bif == NULL) 1443 return (ENOENT); 1444 1445 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1446} 1447 1448static int 1449bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1450{ 1451 struct ifbreq *req = arg; 1452 struct bridge_iflist *bif; 1453 1454 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1455 if (bif == NULL) 1456 return (ENOENT); 1457 1458 bif->bif_addrmax = req->ifbr_addrmax; 1459 return (0); 1460} 1461 1462static int 1463bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1464{ 1465 struct ifbreq *req = arg; 1466 struct bridge_iflist *bif = NULL; 1467 struct ifnet *ifs; 1468 1469 ifs = ifunit(req->ifbr_ifsname); 1470 if (ifs == NULL) 1471 return (ENOENT); 1472 1473 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1474 if (ifs == bif->bif_ifp) 1475 return (EBUSY); 1476 1477 if (ifs->if_bridge != NULL) 1478 return (EBUSY); 1479 1480 switch (ifs->if_type) { 1481 case IFT_ETHER: 1482 case IFT_GIF: 1483 case IFT_L2VLAN: 1484 break; 1485 default: 1486 return (EINVAL); 1487 } 1488 1489 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1490 if (bif == NULL) 1491 return (ENOMEM); 1492 1493 bif->bif_ifp = ifs; 1494 bif->bif_flags = IFBIF_SPAN; 1495 1496 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1497 1498 return (0); 1499} 1500 1501static int 1502bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1503{ 1504 struct ifbreq *req = arg; 1505 struct bridge_iflist *bif; 1506 struct ifnet *ifs; 1507 1508 ifs = ifunit(req->ifbr_ifsname); 1509 if (ifs == NULL) 1510 return (ENOENT); 1511 1512 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1513 if (ifs == bif->bif_ifp) 1514 break; 1515 1516 if (bif == NULL) 1517 return (ENOENT); 1518 1519 bridge_delete_span(sc, bif); 1520 1521 return (0); 1522} 1523 1524static int 1525bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1526{ 1527 struct ifbropreq *req = arg; 1528 struct bstp_state *bs = &sc->sc_stp; 1529 struct bstp_port *root_port; 1530 1531 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1532 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1533 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1534 1535 root_port = bs->bs_root_port; 1536 if (root_port == NULL) 1537 req->ifbop_root_port = 0; 1538 else 1539 req->ifbop_root_port = root_port->bp_ifp->if_index; 1540 1541 req->ifbop_holdcount = bs->bs_txholdcount; 1542 req->ifbop_priority = bs->bs_bridge_priority; 1543 req->ifbop_protocol = bs->bs_protover; 1544 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1545 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1546 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1547 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1548 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1549 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1550 1551 return (0); 1552} 1553 1554static int 1555bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1556{ 1557 struct ifbrparam *param = arg; 1558 1559 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1560 return (0); 1561} 1562 1563static int 1564bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1565{ 1566 struct ifbpstpconf *bifstp = arg; 1567 struct bridge_iflist *bif; 1568 struct bstp_port *bp; 1569 struct ifbpstpreq bpreq; 1570 char *buf, *outbuf; 1571 int count, buflen, len, error = 0; 1572 1573 count = 0; 1574 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1575 if ((bif->bif_flags & IFBIF_STP) != 0) 1576 count++; 1577 } 1578 1579 buflen = sizeof(bpreq) * count; 1580 if (bifstp->ifbpstp_len == 0) { 1581 bifstp->ifbpstp_len = buflen; 1582 return (0); 1583 } 1584 1585 BRIDGE_UNLOCK(sc); 1586 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1587 BRIDGE_LOCK(sc); 1588 1589 count = 0; 1590 buf = outbuf; 1591 len = min(bifstp->ifbpstp_len, buflen); 1592 bzero(&bpreq, sizeof(bpreq)); 1593 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1594 if (len < sizeof(bpreq)) 1595 break; 1596 1597 if ((bif->bif_flags & IFBIF_STP) == 0) 1598 continue; 1599 1600 bp = &bif->bif_stp; 1601 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1602 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1603 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1604 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1605 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1606 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1607 1608 memcpy(buf, &bpreq, sizeof(bpreq)); 1609 count++; 1610 buf += sizeof(bpreq); 1611 len -= sizeof(bpreq); 1612 } 1613 1614 BRIDGE_UNLOCK(sc); 1615 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1616 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1617 BRIDGE_LOCK(sc); 1618 free(outbuf, M_TEMP); 1619 return (error); 1620} 1621 1622static int 1623bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1624{ 1625 struct ifbrparam *param = arg; 1626 1627 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1628} 1629 1630static int 1631bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1632{ 1633 struct ifbrparam *param = arg; 1634 1635 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1636} 1637 1638/* 1639 * bridge_ifdetach: 1640 * 1641 * Detach an interface from a bridge. Called when a member 1642 * interface is detaching. 1643 */ 1644static void 1645bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1646{ 1647 struct bridge_softc *sc = ifp->if_bridge; 1648 struct bridge_iflist *bif; 1649 1650 /* Check if the interface is a bridge member */ 1651 if (sc != NULL) { 1652 BRIDGE_LOCK(sc); 1653 1654 bif = bridge_lookup_member_if(sc, ifp); 1655 if (bif != NULL) 1656 bridge_delete_member(sc, bif, 1); 1657 1658 BRIDGE_UNLOCK(sc); 1659 return; 1660 } 1661 1662 /* Check if the interface is a span port */ 1663 mtx_lock(&bridge_list_mtx); 1664 LIST_FOREACH(sc, &bridge_list, sc_list) { 1665 BRIDGE_LOCK(sc); 1666 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1667 if (ifp == bif->bif_ifp) { 1668 bridge_delete_span(sc, bif); 1669 break; 1670 } 1671 1672 BRIDGE_UNLOCK(sc); 1673 } 1674 mtx_unlock(&bridge_list_mtx); 1675} 1676 1677/* 1678 * bridge_init: 1679 * 1680 * Initialize a bridge interface. 1681 */ 1682static void 1683bridge_init(void *xsc) 1684{ 1685 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1686 struct ifnet *ifp = sc->sc_ifp; 1687 1688 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1689 return; 1690 1691 BRIDGE_LOCK(sc); 1692 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1693 bridge_timer, sc); 1694 1695 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1696 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1697 1698 BRIDGE_UNLOCK(sc); 1699} 1700 1701/* 1702 * bridge_stop: 1703 * 1704 * Stop the bridge interface. 1705 */ 1706static void 1707bridge_stop(struct ifnet *ifp, int disable) 1708{ 1709 struct bridge_softc *sc = ifp->if_softc; 1710 1711 BRIDGE_LOCK_ASSERT(sc); 1712 1713 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1714 return; 1715 1716 callout_stop(&sc->sc_brcallout); 1717 bstp_stop(&sc->sc_stp); 1718 1719 bridge_rtflush(sc, IFBF_FLUSHDYN); 1720 1721 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1722} 1723 1724/* 1725 * bridge_enqueue: 1726 * 1727 * Enqueue a packet on a bridge member interface. 1728 * 1729 */ 1730static void 1731bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1732{ 1733 int len, err = 0; 1734 short mflags; 1735 struct mbuf *m0; 1736 1737 len = m->m_pkthdr.len; 1738 mflags = m->m_flags; 1739 1740 /* We may be sending a fragment so traverse the mbuf */ 1741 for (; m; m = m0) { 1742 m0 = m->m_nextpkt; 1743 m->m_nextpkt = NULL; 1744 1745 /* 1746 * If underlying interface can not do VLAN tag insertion itself 1747 * then attach a packet tag that holds it. 1748 */ 1749 if ((m->m_flags & M_VLANTAG) && 1750 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1751 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1752 if (m == NULL) { 1753 if_printf(dst_ifp, 1754 "unable to prepend VLAN header\n"); 1755 dst_ifp->if_oerrors++; 1756 continue; 1757 } 1758 m->m_flags &= ~M_VLANTAG; 1759 } 1760 1761 if (err == 0) 1762 IFQ_ENQUEUE(&dst_ifp->if_snd, m, err); 1763 } 1764 1765 if (err == 0) { 1766 1767 sc->sc_ifp->if_opackets++; 1768 sc->sc_ifp->if_obytes += len; 1769 1770 dst_ifp->if_obytes += len; 1771 1772 if (mflags & M_MCAST) { 1773 sc->sc_ifp->if_omcasts++; 1774 dst_ifp->if_omcasts++; 1775 } 1776 } 1777 1778 if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0) 1779 (*dst_ifp->if_start)(dst_ifp); 1780} 1781 1782/* 1783 * bridge_dummynet: 1784 * 1785 * Receive a queued packet from dummynet and pass it on to the output 1786 * interface. 1787 * 1788 * The mbuf has the Ethernet header already attached. 1789 */ 1790static void 1791bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1792{ 1793 struct bridge_softc *sc; 1794 1795 sc = ifp->if_bridge; 1796 1797 /* 1798 * The packet didnt originate from a member interface. This should only 1799 * ever happen if a member interface is removed while packets are 1800 * queued for it. 1801 */ 1802 if (sc == NULL) { 1803 m_freem(m); 1804 return; 1805 } 1806 1807 if (PFIL_HOOKED(&inet_pfil_hook) 1808#ifdef INET6 1809 || PFIL_HOOKED(&inet6_pfil_hook) 1810#endif 1811 ) { 1812 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1813 return; 1814 if (m == NULL) 1815 return; 1816 } 1817 1818 bridge_enqueue(sc, ifp, m); 1819} 1820 1821/* 1822 * bridge_output: 1823 * 1824 * Send output from a bridge member interface. This 1825 * performs the bridging function for locally originated 1826 * packets. 1827 * 1828 * The mbuf has the Ethernet header already attached. We must 1829 * enqueue or free the mbuf before returning. 1830 */ 1831static int 1832bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1833 struct rtentry *rt) 1834{ 1835 struct ether_header *eh; 1836 struct ifnet *dst_if; 1837 struct bridge_softc *sc; 1838 uint16_t vlan; 1839 1840 if (m->m_len < ETHER_HDR_LEN) { 1841 m = m_pullup(m, ETHER_HDR_LEN); 1842 if (m == NULL) 1843 return (0); 1844 } 1845 1846 eh = mtod(m, struct ether_header *); 1847 sc = ifp->if_bridge; 1848 vlan = VLANTAGOF(m); 1849 1850 BRIDGE_LOCK(sc); 1851 1852 /* 1853 * If bridge is down, but the original output interface is up, 1854 * go ahead and send out that interface. Otherwise, the packet 1855 * is dropped below. 1856 */ 1857 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1858 dst_if = ifp; 1859 goto sendunicast; 1860 } 1861 1862 /* 1863 * If the packet is a multicast, or we don't know a better way to 1864 * get there, send to all interfaces. 1865 */ 1866 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1867 dst_if = NULL; 1868 else 1869 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1870 if (dst_if == NULL) { 1871 struct bridge_iflist *bif; 1872 struct mbuf *mc; 1873 int error = 0, used = 0; 1874 1875 bridge_span(sc, m); 1876 1877 BRIDGE_LOCK2REF(sc, error); 1878 if (error) { 1879 m_freem(m); 1880 return (0); 1881 } 1882 1883 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1884 dst_if = bif->bif_ifp; 1885 1886 if (dst_if->if_type == IFT_GIF) 1887 continue; 1888 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1889 continue; 1890 1891 /* 1892 * If this is not the original output interface, 1893 * and the interface is participating in spanning 1894 * tree, make sure the port is in a state that 1895 * allows forwarding. 1896 */ 1897 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1898 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1899 continue; 1900 1901 if (LIST_NEXT(bif, bif_next) == NULL) { 1902 used = 1; 1903 mc = m; 1904 } else { 1905 mc = m_copypacket(m, M_DONTWAIT); 1906 if (mc == NULL) { 1907 sc->sc_ifp->if_oerrors++; 1908 continue; 1909 } 1910 } 1911 1912 bridge_enqueue(sc, dst_if, mc); 1913 } 1914 if (used == 0) 1915 m_freem(m); 1916 BRIDGE_UNREF(sc); 1917 return (0); 1918 } 1919 1920sendunicast: 1921 /* 1922 * XXX Spanning tree consideration here? 1923 */ 1924 1925 bridge_span(sc, m); 1926 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1927 m_freem(m); 1928 BRIDGE_UNLOCK(sc); 1929 return (0); 1930 } 1931 1932 BRIDGE_UNLOCK(sc); 1933 bridge_enqueue(sc, dst_if, m); 1934 return (0); 1935} 1936 1937/* 1938 * bridge_start: 1939 * 1940 * Start output on a bridge. 1941 * 1942 */ 1943static void 1944bridge_start(struct ifnet *ifp) 1945{ 1946 struct bridge_softc *sc; 1947 struct mbuf *m; 1948 struct ether_header *eh; 1949 struct ifnet *dst_if; 1950 1951 sc = ifp->if_softc; 1952 1953 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 1954 for (;;) { 1955 IFQ_DEQUEUE(&ifp->if_snd, m); 1956 if (m == 0) 1957 break; 1958 ETHER_BPF_MTAP(ifp, m); 1959 1960 eh = mtod(m, struct ether_header *); 1961 dst_if = NULL; 1962 1963 BRIDGE_LOCK(sc); 1964 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1965 dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1); 1966 } 1967 1968 if (dst_if == NULL) 1969 bridge_broadcast(sc, ifp, m, 0); 1970 else { 1971 BRIDGE_UNLOCK(sc); 1972 bridge_enqueue(sc, dst_if, m); 1973 } 1974 } 1975 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1976} 1977 1978/* 1979 * bridge_forward: 1980 * 1981 * The forwarding function of the bridge. 1982 * 1983 * NOTE: Releases the lock on return. 1984 */ 1985static void 1986bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 1987 struct mbuf *m) 1988{ 1989 struct bridge_iflist *dbif; 1990 struct ifnet *src_if, *dst_if, *ifp; 1991 struct ether_header *eh; 1992 uint16_t vlan; 1993 uint8_t *dst; 1994 int error; 1995 1996 src_if = m->m_pkthdr.rcvif; 1997 ifp = sc->sc_ifp; 1998 1999 ifp->if_ipackets++; 2000 ifp->if_ibytes += m->m_pkthdr.len; 2001 vlan = VLANTAGOF(m); 2002 2003 if ((sbif->bif_flags & IFBIF_STP) && 2004 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2005 goto drop; 2006 2007 eh = mtod(m, struct ether_header *); 2008 dst = eh->ether_dhost; 2009 2010 /* If the interface is learning, record the address. */ 2011 if (sbif->bif_flags & IFBIF_LEARNING) { 2012 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2013 sbif, 0, IFBAF_DYNAMIC); 2014 /* 2015 * If the interface has addresses limits then deny any source 2016 * that is not in the cache. 2017 */ 2018 if (error && sbif->bif_addrmax) 2019 goto drop; 2020 } 2021 2022 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2023 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2024 goto drop; 2025 2026 /* 2027 * At this point, the port either doesn't participate 2028 * in spanning tree or it is in the forwarding state. 2029 */ 2030 2031 /* 2032 * If the packet is unicast, destined for someone on 2033 * "this" side of the bridge, drop it. 2034 */ 2035 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2036 dst_if = bridge_rtlookup(sc, dst, vlan); 2037 if (src_if == dst_if) 2038 goto drop; 2039 } else { 2040 /* 2041 * Check if its a reserved multicast address, any address 2042 * listed in 802.1D section 7.12.6 may not be forwarded by the 2043 * bridge. 2044 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2045 */ 2046 if (dst[0] == 0x01 && dst[1] == 0x80 && 2047 dst[2] == 0xc2 && dst[3] == 0x00 && 2048 dst[4] == 0x00 && dst[5] <= 0x0f) 2049 goto drop; 2050 2051 /* ...forward it to all interfaces. */ 2052 ifp->if_imcasts++; 2053 dst_if = NULL; 2054 } 2055 2056 /* 2057 * If we have a destination interface which is a member of our bridge, 2058 * OR this is a unicast packet, push it through the bpf(4) machinery. 2059 * For broadcast or multicast packets, don't bother because it will 2060 * be reinjected into ether_input. We do this before we pass the packets 2061 * through the pfil(9) framework, as it is possible that pfil(9) will 2062 * drop the packet, or possibly modify it, making it difficult to debug 2063 * firewall issues on the bridge. 2064 */ 2065 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2066 ETHER_BPF_MTAP(ifp, m); 2067 2068 /* run the packet filter */ 2069 if (PFIL_HOOKED(&inet_pfil_hook) 2070#ifdef INET6 2071 || PFIL_HOOKED(&inet6_pfil_hook) 2072#endif 2073 ) { 2074 BRIDGE_UNLOCK(sc); 2075 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2076 return; 2077 if (m == NULL) 2078 return; 2079 BRIDGE_LOCK(sc); 2080 } 2081 2082 if (dst_if == NULL) { 2083 bridge_broadcast(sc, src_if, m, 1); 2084 return; 2085 } 2086 2087 /* 2088 * At this point, we're dealing with a unicast frame 2089 * going to a different interface. 2090 */ 2091 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2092 goto drop; 2093 2094 dbif = bridge_lookup_member_if(sc, dst_if); 2095 if (dbif == NULL) 2096 /* Not a member of the bridge (anymore?) */ 2097 goto drop; 2098 2099 /* Private segments can not talk to each other */ 2100 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2101 goto drop; 2102 2103 if ((dbif->bif_flags & IFBIF_STP) && 2104 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2105 goto drop; 2106 2107 BRIDGE_UNLOCK(sc); 2108 2109 if (PFIL_HOOKED(&inet_pfil_hook) 2110#ifdef INET6 2111 || PFIL_HOOKED(&inet6_pfil_hook) 2112#endif 2113 ) { 2114 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2115 return; 2116 if (m == NULL) 2117 return; 2118 } 2119 2120 bridge_enqueue(sc, dst_if, m); 2121 return; 2122 2123drop: 2124 BRIDGE_UNLOCK(sc); 2125 m_freem(m); 2126} 2127 2128/* 2129 * bridge_input: 2130 * 2131 * Receive input from a member interface. Queue the packet for 2132 * bridging if it is not for us. 2133 */ 2134static struct mbuf * 2135bridge_input(struct ifnet *ifp, struct mbuf *m) 2136{ 2137 struct bridge_softc *sc = ifp->if_bridge; 2138 struct bridge_iflist *bif, *bif2; 2139 struct ifnet *bifp; 2140 struct ether_header *eh; 2141 struct mbuf *mc, *mc2; 2142 uint16_t vlan; 2143 int error; 2144 2145 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2146 return (m); 2147 2148 bifp = sc->sc_ifp; 2149 vlan = VLANTAGOF(m); 2150 2151 /* 2152 * Implement support for bridge monitoring. If this flag has been 2153 * set on this interface, discard the packet once we push it through 2154 * the bpf(4) machinery, but before we do, increment the byte and 2155 * packet counters associated with this interface. 2156 */ 2157 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2158 m->m_pkthdr.rcvif = bifp; 2159 ETHER_BPF_MTAP(bifp, m); 2160 bifp->if_ipackets++; 2161 bifp->if_ibytes += m->m_pkthdr.len; 2162 m_freem(m); 2163 return (NULL); 2164 } 2165 BRIDGE_LOCK(sc); 2166 bif = bridge_lookup_member_if(sc, ifp); 2167 if (bif == NULL) { 2168 BRIDGE_UNLOCK(sc); 2169 return (m); 2170 } 2171 2172 eh = mtod(m, struct ether_header *); 2173 2174 bridge_span(sc, m); 2175 2176 if (m->m_flags & (M_BCAST|M_MCAST)) { 2177 /* Tap off 802.1D packets; they do not get forwarded. */ 2178 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2179 ETHER_ADDR_LEN) == 0) { 2180 m = bstp_input(&bif->bif_stp, ifp, m); 2181 if (m == NULL) { 2182 BRIDGE_UNLOCK(sc); 2183 return (NULL); 2184 } 2185 } 2186 2187 if ((bif->bif_flags & IFBIF_STP) && 2188 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2189 BRIDGE_UNLOCK(sc); 2190 return (m); 2191 } 2192 2193 /* 2194 * Make a deep copy of the packet and enqueue the copy 2195 * for bridge processing; return the original packet for 2196 * local processing. 2197 */ 2198 mc = m_dup(m, M_DONTWAIT); 2199 if (mc == NULL) { 2200 BRIDGE_UNLOCK(sc); 2201 return (m); 2202 } 2203 2204 /* Perform the bridge forwarding function with the copy. */ 2205 bridge_forward(sc, bif, mc); 2206 2207 /* 2208 * Reinject the mbuf as arriving on the bridge so we have a 2209 * chance at claiming multicast packets. We can not loop back 2210 * here from ether_input as a bridge is never a member of a 2211 * bridge. 2212 */ 2213 KASSERT(bifp->if_bridge == NULL, 2214 ("loop created in bridge_input")); 2215 mc2 = m_dup(m, M_DONTWAIT); 2216 if (mc2 != NULL) { 2217 /* Keep the layer3 header aligned */ 2218 int i = min(mc2->m_pkthdr.len, max_protohdr); 2219 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2220 } 2221 if (mc2 != NULL) { 2222 mc2->m_pkthdr.rcvif = bifp; 2223 (*bifp->if_input)(bifp, mc2); 2224 } 2225 2226 /* Return the original packet for local processing. */ 2227 return (m); 2228 } 2229 2230 if ((bif->bif_flags & IFBIF_STP) && 2231 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2232 BRIDGE_UNLOCK(sc); 2233 return (m); 2234 } 2235 2236#ifdef DEV_CARP 2237# define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2238 || ((iface)->if_carp \ 2239 && carp_forus((iface)->if_carp, eh->ether_dhost)) 2240# define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2241 || ((iface)->if_carp \ 2242 && carp_forus((iface)->if_carp, eh->ether_shost)) 2243#else 2244# define OR_CARP_CHECK_WE_ARE_DST(iface) 2245# define OR_CARP_CHECK_WE_ARE_SRC(iface) 2246#endif 2247 2248#ifdef INET6 2249# define OR_PFIL_HOOKED_INET6 \ 2250 || PFIL_HOOKED(&inet6_pfil_hook) 2251#else 2252# define OR_PFIL_HOOKED_INET6 2253#endif 2254 2255#define GRAB_OUR_PACKETS(iface) \ 2256 if ((iface)->if_type == IFT_GIF) \ 2257 continue; \ 2258 /* It is destined for us. */ \ 2259 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2260 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2261 ) { \ 2262 if ((iface)->if_type == IFT_BRIDGE) { \ 2263 ETHER_BPF_MTAP(iface, m); \ 2264 iface->if_ipackets++; \ 2265 /* Filter on the physical interface. */ \ 2266 if (pfil_local_phys && \ 2267 (PFIL_HOOKED(&inet_pfil_hook) \ 2268 OR_PFIL_HOOKED_INET6)) { \ 2269 if (bridge_pfil(&m, NULL, ifp, \ 2270 PFIL_IN) != 0 || m == NULL) { \ 2271 BRIDGE_UNLOCK(sc); \ 2272 return (NULL); \ 2273 } \ 2274 } \ 2275 } \ 2276 if (bif->bif_flags & IFBIF_LEARNING) { \ 2277 error = bridge_rtupdate(sc, eh->ether_shost, \ 2278 vlan, bif, 0, IFBAF_DYNAMIC); \ 2279 if (error && bif->bif_addrmax) { \ 2280 BRIDGE_UNLOCK(sc); \ 2281 m_freem(m); \ 2282 return (NULL); \ 2283 } \ 2284 } \ 2285 m->m_pkthdr.rcvif = iface; \ 2286 BRIDGE_UNLOCK(sc); \ 2287 return (m); \ 2288 } \ 2289 \ 2290 /* We just received a packet that we sent out. */ \ 2291 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2292 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2293 ) { \ 2294 BRIDGE_UNLOCK(sc); \ 2295 m_freem(m); \ 2296 return (NULL); \ 2297 } 2298 2299 /* 2300 * Unicast. Make sure it's not for the bridge. 2301 */ 2302 do { GRAB_OUR_PACKETS(bifp) } while (0); 2303 2304 /* 2305 * Give a chance for ifp at first priority. This will help when the 2306 * packet comes through the interface like VLAN's with the same MACs 2307 * on several interfaces from the same bridge. This also will save 2308 * some CPU cycles in case the destination interface and the input 2309 * interface (eq ifp) are the same. 2310 */ 2311 do { GRAB_OUR_PACKETS(ifp) } while (0); 2312 2313 /* Now check the all bridge members. */ 2314 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2315 GRAB_OUR_PACKETS(bif2->bif_ifp) 2316 } 2317 2318#undef OR_CARP_CHECK_WE_ARE_DST 2319#undef OR_CARP_CHECK_WE_ARE_SRC 2320#undef OR_PFIL_HOOKED_INET6 2321#undef GRAB_OUR_PACKETS 2322 2323 /* Perform the bridge forwarding function. */ 2324 bridge_forward(sc, bif, m); 2325 2326 return (NULL); 2327} 2328 2329/* 2330 * bridge_broadcast: 2331 * 2332 * Send a frame to all interfaces that are members of 2333 * the bridge, except for the one on which the packet 2334 * arrived. 2335 * 2336 * NOTE: Releases the lock on return. 2337 */ 2338static void 2339bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2340 struct mbuf *m, int runfilt) 2341{ 2342 struct bridge_iflist *dbif, *sbif; 2343 struct mbuf *mc; 2344 struct ifnet *dst_if; 2345 int error = 0, used = 0, i; 2346 2347 sbif = bridge_lookup_member_if(sc, src_if); 2348 2349 BRIDGE_LOCK2REF(sc, error); 2350 if (error) { 2351 m_freem(m); 2352 return; 2353 } 2354 2355 /* Filter on the bridge interface before broadcasting */ 2356 if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) 2357#ifdef INET6 2358 || PFIL_HOOKED(&inet6_pfil_hook) 2359#endif 2360 )) { 2361 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2362 goto out; 2363 if (m == NULL) 2364 goto out; 2365 } 2366 2367 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2368 dst_if = dbif->bif_ifp; 2369 if (dst_if == src_if) 2370 continue; 2371 2372 /* Private segments can not talk to each other */ 2373 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2374 continue; 2375 2376 if ((dbif->bif_flags & IFBIF_STP) && 2377 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2378 continue; 2379 2380 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2381 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2382 continue; 2383 2384 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2385 continue; 2386 2387 if (LIST_NEXT(dbif, bif_next) == NULL) { 2388 mc = m; 2389 used = 1; 2390 } else { 2391 mc = m_dup(m, M_DONTWAIT); 2392 if (mc == NULL) { 2393 sc->sc_ifp->if_oerrors++; 2394 continue; 2395 } 2396 } 2397 2398 /* 2399 * Filter on the output interface. Pass a NULL bridge interface 2400 * pointer so we do not redundantly filter on the bridge for 2401 * each interface we broadcast on. 2402 */ 2403 if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) 2404#ifdef INET6 2405 || PFIL_HOOKED(&inet6_pfil_hook) 2406#endif 2407 )) { 2408 if (used == 0) { 2409 /* Keep the layer3 header aligned */ 2410 i = min(mc->m_pkthdr.len, max_protohdr); 2411 mc = m_copyup(mc, i, ETHER_ALIGN); 2412 if (mc == NULL) { 2413 sc->sc_ifp->if_oerrors++; 2414 continue; 2415 } 2416 } 2417 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2418 continue; 2419 if (mc == NULL) 2420 continue; 2421 } 2422 2423 bridge_enqueue(sc, dst_if, mc); 2424 } 2425 if (used == 0) 2426 m_freem(m); 2427 2428out: 2429 BRIDGE_UNREF(sc); 2430} 2431 2432/* 2433 * bridge_span: 2434 * 2435 * Duplicate a packet out one or more interfaces that are in span mode, 2436 * the original mbuf is unmodified. 2437 */ 2438static void 2439bridge_span(struct bridge_softc *sc, struct mbuf *m) 2440{ 2441 struct bridge_iflist *bif; 2442 struct ifnet *dst_if; 2443 struct mbuf *mc; 2444 2445 if (LIST_EMPTY(&sc->sc_spanlist)) 2446 return; 2447 2448 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2449 dst_if = bif->bif_ifp; 2450 2451 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2452 continue; 2453 2454 mc = m_copypacket(m, M_DONTWAIT); 2455 if (mc == NULL) { 2456 sc->sc_ifp->if_oerrors++; 2457 continue; 2458 } 2459 2460 bridge_enqueue(sc, dst_if, mc); 2461 } 2462} 2463 2464/* 2465 * bridge_rtupdate: 2466 * 2467 * Add a bridge routing entry. 2468 */ 2469static int 2470bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2471 struct bridge_iflist *bif, int setflags, uint8_t flags) 2472{ 2473 struct bridge_rtnode *brt; 2474 int error; 2475 2476 BRIDGE_LOCK_ASSERT(sc); 2477 2478 /* Check the source address is valid and not multicast. */ 2479 if (ETHER_IS_MULTICAST(dst) || 2480 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2481 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2482 return (EINVAL); 2483 2484 /* 802.1p frames map to vlan 1 */ 2485 if (vlan == 0) 2486 vlan = 1; 2487 2488 /* 2489 * A route for this destination might already exist. If so, 2490 * update it, otherwise create a new one. 2491 */ 2492 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2493 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2494 sc->sc_brtexceeded++; 2495 return (ENOSPC); 2496 } 2497 /* Check per interface address limits (if enabled) */ 2498 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2499 bif->bif_addrexceeded++; 2500 return (ENOSPC); 2501 } 2502 2503 /* 2504 * Allocate a new bridge forwarding node, and 2505 * initialize the expiration time and Ethernet 2506 * address. 2507 */ 2508 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2509 if (brt == NULL) 2510 return (ENOMEM); 2511 2512 if (bif->bif_flags & IFBIF_STICKY) 2513 brt->brt_flags = IFBAF_STICKY; 2514 else 2515 brt->brt_flags = IFBAF_DYNAMIC; 2516 2517 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2518 brt->brt_vlan = vlan; 2519 2520 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2521 uma_zfree(bridge_rtnode_zone, brt); 2522 return (error); 2523 } 2524 brt->brt_dst = bif; 2525 bif->bif_addrcnt++; 2526 } 2527 2528 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2529 brt->brt_dst != bif) { 2530 brt->brt_dst->bif_addrcnt--; 2531 brt->brt_dst = bif; 2532 brt->brt_dst->bif_addrcnt++; 2533 } 2534 2535 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2536 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2537 if (setflags) 2538 brt->brt_flags = flags; 2539 2540 return (0); 2541} 2542 2543/* 2544 * bridge_rtlookup: 2545 * 2546 * Lookup the destination interface for an address. 2547 */ 2548static struct ifnet * 2549bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2550{ 2551 struct bridge_rtnode *brt; 2552 2553 BRIDGE_LOCK_ASSERT(sc); 2554 2555 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2556 return (NULL); 2557 2558 return (brt->brt_ifp); 2559} 2560 2561/* 2562 * bridge_rttrim: 2563 * 2564 * Trim the routine table so that we have a number 2565 * of routing entries less than or equal to the 2566 * maximum number. 2567 */ 2568static void 2569bridge_rttrim(struct bridge_softc *sc) 2570{ 2571 struct bridge_rtnode *brt, *nbrt; 2572 2573 BRIDGE_LOCK_ASSERT(sc); 2574 2575 /* Make sure we actually need to do this. */ 2576 if (sc->sc_brtcnt <= sc->sc_brtmax) 2577 return; 2578 2579 /* Force an aging cycle; this might trim enough addresses. */ 2580 bridge_rtage(sc); 2581 if (sc->sc_brtcnt <= sc->sc_brtmax) 2582 return; 2583 2584 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2585 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2586 bridge_rtnode_destroy(sc, brt); 2587 if (sc->sc_brtcnt <= sc->sc_brtmax) 2588 return; 2589 } 2590 } 2591} 2592 2593/* 2594 * bridge_timer: 2595 * 2596 * Aging timer for the bridge. 2597 */ 2598static void 2599bridge_timer(void *arg) 2600{ 2601 struct bridge_softc *sc = arg; 2602 2603 BRIDGE_LOCK_ASSERT(sc); 2604 2605 bridge_rtage(sc); 2606 2607 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2608 callout_reset(&sc->sc_brcallout, 2609 bridge_rtable_prune_period * hz, bridge_timer, sc); 2610} 2611 2612/* 2613 * bridge_rtage: 2614 * 2615 * Perform an aging cycle. 2616 */ 2617static void 2618bridge_rtage(struct bridge_softc *sc) 2619{ 2620 struct bridge_rtnode *brt, *nbrt; 2621 2622 BRIDGE_LOCK_ASSERT(sc); 2623 2624 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2625 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2626 if (time_uptime >= brt->brt_expire) 2627 bridge_rtnode_destroy(sc, brt); 2628 } 2629 } 2630} 2631 2632/* 2633 * bridge_rtflush: 2634 * 2635 * Remove all dynamic addresses from the bridge. 2636 */ 2637static void 2638bridge_rtflush(struct bridge_softc *sc, int full) 2639{ 2640 struct bridge_rtnode *brt, *nbrt; 2641 2642 BRIDGE_LOCK_ASSERT(sc); 2643 2644 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2645 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2646 bridge_rtnode_destroy(sc, brt); 2647 } 2648} 2649 2650/* 2651 * bridge_rtdaddr: 2652 * 2653 * Remove an address from the table. 2654 */ 2655static int 2656bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2657{ 2658 struct bridge_rtnode *brt; 2659 int found = 0; 2660 2661 BRIDGE_LOCK_ASSERT(sc); 2662 2663 /* 2664 * If vlan is zero then we want to delete for all vlans so the lookup 2665 * may return more than one. 2666 */ 2667 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2668 bridge_rtnode_destroy(sc, brt); 2669 found = 1; 2670 } 2671 2672 return (found ? 0 : ENOENT); 2673} 2674 2675/* 2676 * bridge_rtdelete: 2677 * 2678 * Delete routes to a speicifc member interface. 2679 */ 2680static void 2681bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2682{ 2683 struct bridge_rtnode *brt, *nbrt; 2684 2685 BRIDGE_LOCK_ASSERT(sc); 2686 2687 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2688 if (brt->brt_ifp == ifp && (full || 2689 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2690 bridge_rtnode_destroy(sc, brt); 2691 } 2692} 2693 2694/* 2695 * bridge_rtable_init: 2696 * 2697 * Initialize the route table for this bridge. 2698 */ 2699static int 2700bridge_rtable_init(struct bridge_softc *sc) 2701{ 2702 int i; 2703 2704 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2705 M_DEVBUF, M_NOWAIT); 2706 if (sc->sc_rthash == NULL) 2707 return (ENOMEM); 2708 2709 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2710 LIST_INIT(&sc->sc_rthash[i]); 2711 2712 sc->sc_rthash_key = arc4random(); 2713 2714 LIST_INIT(&sc->sc_rtlist); 2715 2716 return (0); 2717} 2718 2719/* 2720 * bridge_rtable_fini: 2721 * 2722 * Deconstruct the route table for this bridge. 2723 */ 2724static void 2725bridge_rtable_fini(struct bridge_softc *sc) 2726{ 2727 2728 KASSERT(sc->sc_brtcnt == 0, 2729 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2730 free(sc->sc_rthash, M_DEVBUF); 2731} 2732 2733/* 2734 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2735 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2736 */ 2737#define mix(a, b, c) \ 2738do { \ 2739 a -= b; a -= c; a ^= (c >> 13); \ 2740 b -= c; b -= a; b ^= (a << 8); \ 2741 c -= a; c -= b; c ^= (b >> 13); \ 2742 a -= b; a -= c; a ^= (c >> 12); \ 2743 b -= c; b -= a; b ^= (a << 16); \ 2744 c -= a; c -= b; c ^= (b >> 5); \ 2745 a -= b; a -= c; a ^= (c >> 3); \ 2746 b -= c; b -= a; b ^= (a << 10); \ 2747 c -= a; c -= b; c ^= (b >> 15); \ 2748} while (/*CONSTCOND*/0) 2749 2750static __inline uint32_t 2751bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2752{ 2753 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2754 2755 b += addr[5] << 8; 2756 b += addr[4]; 2757 a += addr[3] << 24; 2758 a += addr[2] << 16; 2759 a += addr[1] << 8; 2760 a += addr[0]; 2761 2762 mix(a, b, c); 2763 2764 return (c & BRIDGE_RTHASH_MASK); 2765} 2766 2767#undef mix 2768 2769static int 2770bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2771{ 2772 int i, d; 2773 2774 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2775 d = ((int)a[i]) - ((int)b[i]); 2776 } 2777 2778 return (d); 2779} 2780 2781/* 2782 * bridge_rtnode_lookup: 2783 * 2784 * Look up a bridge route node for the specified destination. Compare the 2785 * vlan id or if zero then just return the first match. 2786 */ 2787static struct bridge_rtnode * 2788bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2789{ 2790 struct bridge_rtnode *brt; 2791 uint32_t hash; 2792 int dir; 2793 2794 BRIDGE_LOCK_ASSERT(sc); 2795 2796 hash = bridge_rthash(sc, addr); 2797 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2798 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2799 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2800 return (brt); 2801 if (dir > 0) 2802 return (NULL); 2803 } 2804 2805 return (NULL); 2806} 2807 2808/* 2809 * bridge_rtnode_insert: 2810 * 2811 * Insert the specified bridge node into the route table. We 2812 * assume the entry is not already in the table. 2813 */ 2814static int 2815bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2816{ 2817 struct bridge_rtnode *lbrt; 2818 uint32_t hash; 2819 int dir; 2820 2821 BRIDGE_LOCK_ASSERT(sc); 2822 2823 hash = bridge_rthash(sc, brt->brt_addr); 2824 2825 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2826 if (lbrt == NULL) { 2827 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2828 goto out; 2829 } 2830 2831 do { 2832 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2833 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2834 return (EEXIST); 2835 if (dir > 0) { 2836 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2837 goto out; 2838 } 2839 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2840 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2841 goto out; 2842 } 2843 lbrt = LIST_NEXT(lbrt, brt_hash); 2844 } while (lbrt != NULL); 2845 2846#ifdef DIAGNOSTIC 2847 panic("bridge_rtnode_insert: impossible"); 2848#endif 2849 2850out: 2851 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2852 sc->sc_brtcnt++; 2853 2854 return (0); 2855} 2856 2857/* 2858 * bridge_rtnode_destroy: 2859 * 2860 * Destroy a bridge rtnode. 2861 */ 2862static void 2863bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2864{ 2865 BRIDGE_LOCK_ASSERT(sc); 2866 2867 LIST_REMOVE(brt, brt_hash); 2868 2869 LIST_REMOVE(brt, brt_list); 2870 sc->sc_brtcnt--; 2871 brt->brt_dst->bif_addrcnt--; 2872 uma_zfree(bridge_rtnode_zone, brt); 2873} 2874 2875/* 2876 * bridge_rtable_expire: 2877 * 2878 * Set the expiry time for all routes on an interface. 2879 */ 2880static void 2881bridge_rtable_expire(struct ifnet *ifp, int age) 2882{ 2883 struct bridge_softc *sc = ifp->if_bridge; 2884 struct bridge_rtnode *brt; 2885 2886 BRIDGE_LOCK(sc); 2887 2888 /* 2889 * If the age is zero then flush, otherwise set all the expiry times to 2890 * age for the interface 2891 */ 2892 if (age == 0) 2893 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2894 else { 2895 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2896 /* Cap the expiry time to 'age' */ 2897 if (brt->brt_ifp == ifp && 2898 brt->brt_expire > time_uptime + age && 2899 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2900 brt->brt_expire = time_uptime + age; 2901 } 2902 } 2903 BRIDGE_UNLOCK(sc); 2904} 2905 2906/* 2907 * bridge_state_change: 2908 * 2909 * Callback from the bridgestp code when a port changes states. 2910 */ 2911static void 2912bridge_state_change(struct ifnet *ifp, int state) 2913{ 2914 struct bridge_softc *sc = ifp->if_bridge; 2915 static const char *stpstates[] = { 2916 "disabled", 2917 "listening", 2918 "learning", 2919 "forwarding", 2920 "blocking", 2921 "discarding" 2922 }; 2923 2924 if (log_stp) 2925 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 2926 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 2927} 2928 2929/* 2930 * Send bridge packets through pfil if they are one of the types pfil can deal 2931 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2932 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2933 * that interface. 2934 */ 2935static int 2936bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2937{ 2938 int snap, error, i, hlen; 2939 struct ether_header *eh1, eh2; 2940 struct ip_fw_args args; 2941 struct ip *ip; 2942 struct llc llc1; 2943 u_int16_t ether_type; 2944 2945 snap = 0; 2946 error = -1; /* Default error if not error == 0 */ 2947 2948#if 0 2949 /* we may return with the IP fields swapped, ensure its not shared */ 2950 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 2951#endif 2952 2953 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2954 return (0); /* filtering is disabled */ 2955 2956 i = min((*mp)->m_pkthdr.len, max_protohdr); 2957 if ((*mp)->m_len < i) { 2958 *mp = m_pullup(*mp, i); 2959 if (*mp == NULL) { 2960 printf("%s: m_pullup failed\n", __func__); 2961 return (-1); 2962 } 2963 } 2964 2965 eh1 = mtod(*mp, struct ether_header *); 2966 ether_type = ntohs(eh1->ether_type); 2967 2968 /* 2969 * Check for SNAP/LLC. 2970 */ 2971 if (ether_type < ETHERMTU) { 2972 struct llc *llc2 = (struct llc *)(eh1 + 1); 2973 2974 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2975 llc2->llc_dsap == LLC_SNAP_LSAP && 2976 llc2->llc_ssap == LLC_SNAP_LSAP && 2977 llc2->llc_control == LLC_UI) { 2978 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2979 snap = 1; 2980 } 2981 } 2982 2983 /* 2984 * If we're trying to filter bridge traffic, don't look at anything 2985 * other than IP and ARP traffic. If the filter doesn't understand 2986 * IPv6, don't allow IPv6 through the bridge either. This is lame 2987 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2988 * but of course we don't have an AppleTalk filter to begin with. 2989 * (Note that since pfil doesn't understand ARP it will pass *ALL* 2990 * ARP traffic.) 2991 */ 2992 switch (ether_type) { 2993 case ETHERTYPE_ARP: 2994 case ETHERTYPE_REVARP: 2995 if (pfil_ipfw_arp == 0) 2996 return (0); /* Automatically pass */ 2997 break; 2998 2999 case ETHERTYPE_IP: 3000#ifdef INET6 3001 case ETHERTYPE_IPV6: 3002#endif /* INET6 */ 3003 break; 3004 default: 3005 /* 3006 * Check to see if the user wants to pass non-ip 3007 * packets, these will not be checked by pfil(9) and 3008 * passed unconditionally so the default is to drop. 3009 */ 3010 if (pfil_onlyip) 3011 goto bad; 3012 } 3013 3014 /* Strip off the Ethernet header and keep a copy. */ 3015 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3016 m_adj(*mp, ETHER_HDR_LEN); 3017 3018 /* Strip off snap header, if present */ 3019 if (snap) { 3020 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3021 m_adj(*mp, sizeof(struct llc)); 3022 } 3023 3024 /* 3025 * Check the IP header for alignment and errors 3026 */ 3027 if (dir == PFIL_IN) { 3028 switch (ether_type) { 3029 case ETHERTYPE_IP: 3030 error = bridge_ip_checkbasic(mp); 3031 break; 3032#ifdef INET6 3033 case ETHERTYPE_IPV6: 3034 error = bridge_ip6_checkbasic(mp); 3035 break; 3036#endif /* INET6 */ 3037 default: 3038 error = 0; 3039 } 3040 if (error) 3041 goto bad; 3042 } 3043 3044 if (IPFW_LOADED && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) { 3045 INIT_VNET_INET(curvnet); 3046 3047 error = -1; 3048 args.rule = ip_dn_claim_rule(*mp); 3049 if (args.rule != NULL && V_fw_one_pass) 3050 goto ipfwpass; /* packet already partially processed */ 3051 3052 args.m = *mp; 3053 args.oif = ifp; 3054 args.next_hop = NULL; 3055 args.eh = &eh2; 3056 args.inp = NULL; /* used by ipfw uid/gid/jail rules */ 3057 i = ip_fw_chk_ptr(&args); 3058 *mp = args.m; 3059 3060 if (*mp == NULL) 3061 return (error); 3062 3063 if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) { 3064 3065 /* put the Ethernet header back on */ 3066 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3067 if (*mp == NULL) 3068 return (error); 3069 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3070 3071 /* 3072 * Pass the pkt to dummynet, which consumes it. The 3073 * packet will return to us via bridge_dummynet(). 3074 */ 3075 args.oif = ifp; 3076 ip_dn_io_ptr(mp, DN_TO_IFB_FWD, &args); 3077 return (error); 3078 } 3079 3080 if (i != IP_FW_PASS) /* drop */ 3081 goto bad; 3082 } 3083 3084ipfwpass: 3085 error = 0; 3086 3087 /* 3088 * Run the packet through pfil 3089 */ 3090 switch (ether_type) { 3091 case ETHERTYPE_IP: 3092 /* 3093 * before calling the firewall, swap fields the same as 3094 * IP does. here we assume the header is contiguous 3095 */ 3096 ip = mtod(*mp, struct ip *); 3097 3098 ip->ip_len = ntohs(ip->ip_len); 3099 ip->ip_off = ntohs(ip->ip_off); 3100 3101 /* 3102 * Run pfil on the member interface and the bridge, both can 3103 * be skipped by clearing pfil_member or pfil_bridge. 3104 * 3105 * Keep the order: 3106 * in_if -> bridge_if -> out_if 3107 */ 3108 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3109 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 3110 dir, NULL); 3111 3112 if (*mp == NULL || error != 0) /* filter may consume */ 3113 break; 3114 3115 if (pfil_member && ifp != NULL) 3116 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, 3117 dir, NULL); 3118 3119 if (*mp == NULL || error != 0) /* filter may consume */ 3120 break; 3121 3122 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3123 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 3124 dir, NULL); 3125 3126 if (*mp == NULL || error != 0) /* filter may consume */ 3127 break; 3128 3129 /* check if we need to fragment the packet */ 3130 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3131 i = (*mp)->m_pkthdr.len; 3132 if (i > ifp->if_mtu) { 3133 error = bridge_fragment(ifp, *mp, &eh2, snap, 3134 &llc1); 3135 return (error); 3136 } 3137 } 3138 3139 /* Recalculate the ip checksum and restore byte ordering */ 3140 ip = mtod(*mp, struct ip *); 3141 hlen = ip->ip_hl << 2; 3142 if (hlen < sizeof(struct ip)) 3143 goto bad; 3144 if (hlen > (*mp)->m_len) { 3145 if ((*mp = m_pullup(*mp, hlen)) == 0) 3146 goto bad; 3147 ip = mtod(*mp, struct ip *); 3148 if (ip == NULL) 3149 goto bad; 3150 } 3151 ip->ip_len = htons(ip->ip_len); 3152 ip->ip_off = htons(ip->ip_off); 3153 ip->ip_sum = 0; 3154 if (hlen == sizeof(struct ip)) 3155 ip->ip_sum = in_cksum_hdr(ip); 3156 else 3157 ip->ip_sum = in_cksum(*mp, hlen); 3158 3159 break; 3160#ifdef INET6 3161 case ETHERTYPE_IPV6: 3162 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3163 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 3164 dir, NULL); 3165 3166 if (*mp == NULL || error != 0) /* filter may consume */ 3167 break; 3168 3169 if (pfil_member && ifp != NULL) 3170 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, 3171 dir, NULL); 3172 3173 if (*mp == NULL || error != 0) /* filter may consume */ 3174 break; 3175 3176 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3177 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 3178 dir, NULL); 3179 break; 3180#endif 3181 default: 3182 error = 0; 3183 break; 3184 } 3185 3186 if (*mp == NULL) 3187 return (error); 3188 if (error != 0) 3189 goto bad; 3190 3191 error = -1; 3192 3193 /* 3194 * Finally, put everything back the way it was and return 3195 */ 3196 if (snap) { 3197 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 3198 if (*mp == NULL) 3199 return (error); 3200 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3201 } 3202 3203 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3204 if (*mp == NULL) 3205 return (error); 3206 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3207 3208 return (0); 3209 3210bad: 3211 m_freem(*mp); 3212 *mp = NULL; 3213 return (error); 3214} 3215 3216/* 3217 * Perform basic checks on header size since 3218 * pfil assumes ip_input has already processed 3219 * it for it. Cut-and-pasted from ip_input.c. 3220 * Given how simple the IPv6 version is, 3221 * does the IPv4 version really need to be 3222 * this complicated? 3223 * 3224 * XXX Should we update ipstat here, or not? 3225 * XXX Right now we update ipstat but not 3226 * XXX csum_counter. 3227 */ 3228static int 3229bridge_ip_checkbasic(struct mbuf **mp) 3230{ 3231 INIT_VNET_INET(curvnet); 3232 struct mbuf *m = *mp; 3233 struct ip *ip; 3234 int len, hlen; 3235 u_short sum; 3236 3237 if (*mp == NULL) 3238 return (-1); 3239 3240 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3241 if ((m = m_copyup(m, sizeof(struct ip), 3242 (max_linkhdr + 3) & ~3)) == NULL) { 3243 /* XXXJRT new stat, please */ 3244 V_ipstat.ips_toosmall++; 3245 goto bad; 3246 } 3247 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3248 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3249 V_ipstat.ips_toosmall++; 3250 goto bad; 3251 } 3252 } 3253 ip = mtod(m, struct ip *); 3254 if (ip == NULL) goto bad; 3255 3256 if (ip->ip_v != IPVERSION) { 3257 V_ipstat.ips_badvers++; 3258 goto bad; 3259 } 3260 hlen = ip->ip_hl << 2; 3261 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3262 V_ipstat.ips_badhlen++; 3263 goto bad; 3264 } 3265 if (hlen > m->m_len) { 3266 if ((m = m_pullup(m, hlen)) == 0) { 3267 V_ipstat.ips_badhlen++; 3268 goto bad; 3269 } 3270 ip = mtod(m, struct ip *); 3271 if (ip == NULL) goto bad; 3272 } 3273 3274 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3275 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3276 } else { 3277 if (hlen == sizeof(struct ip)) { 3278 sum = in_cksum_hdr(ip); 3279 } else { 3280 sum = in_cksum(m, hlen); 3281 } 3282 } 3283 if (sum) { 3284 V_ipstat.ips_badsum++; 3285 goto bad; 3286 } 3287 3288 /* Retrieve the packet length. */ 3289 len = ntohs(ip->ip_len); 3290 3291 /* 3292 * Check for additional length bogosity 3293 */ 3294 if (len < hlen) { 3295 V_ipstat.ips_badlen++; 3296 goto bad; 3297 } 3298 3299 /* 3300 * Check that the amount of data in the buffers 3301 * is as at least much as the IP header would have us expect. 3302 * Drop packet if shorter than we expect. 3303 */ 3304 if (m->m_pkthdr.len < len) { 3305 V_ipstat.ips_tooshort++; 3306 goto bad; 3307 } 3308 3309 /* Checks out, proceed */ 3310 *mp = m; 3311 return (0); 3312 3313bad: 3314 *mp = m; 3315 return (-1); 3316} 3317 3318#ifdef INET6 3319/* 3320 * Same as above, but for IPv6. 3321 * Cut-and-pasted from ip6_input.c. 3322 * XXX Should we update ip6stat, or not? 3323 */ 3324static int 3325bridge_ip6_checkbasic(struct mbuf **mp) 3326{ 3327 INIT_VNET_INET6(curvnet); 3328 struct mbuf *m = *mp; 3329 struct ip6_hdr *ip6; 3330 3331 /* 3332 * If the IPv6 header is not aligned, slurp it up into a new 3333 * mbuf with space for link headers, in the event we forward 3334 * it. Otherwise, if it is aligned, make sure the entire base 3335 * IPv6 header is in the first mbuf of the chain. 3336 */ 3337 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3338 struct ifnet *inifp = m->m_pkthdr.rcvif; 3339 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3340 (max_linkhdr + 3) & ~3)) == NULL) { 3341 /* XXXJRT new stat, please */ 3342 V_ip6stat.ip6s_toosmall++; 3343 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3344 goto bad; 3345 } 3346 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3347 struct ifnet *inifp = m->m_pkthdr.rcvif; 3348 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3349 V_ip6stat.ip6s_toosmall++; 3350 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3351 goto bad; 3352 } 3353 } 3354 3355 ip6 = mtod(m, struct ip6_hdr *); 3356 3357 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3358 V_ip6stat.ip6s_badvers++; 3359 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3360 goto bad; 3361 } 3362 3363 /* Checks out, proceed */ 3364 *mp = m; 3365 return (0); 3366 3367bad: 3368 *mp = m; 3369 return (-1); 3370} 3371#endif /* INET6 */ 3372 3373/* 3374 * bridge_fragment: 3375 * 3376 * Return a fragmented mbuf chain. 3377 */ 3378static int 3379bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3380 int snap, struct llc *llc) 3381{ 3382 INIT_VNET_INET(curvnet); 3383 struct mbuf *m0; 3384 struct ip *ip; 3385 int error = -1; 3386 3387 if (m->m_len < sizeof(struct ip) && 3388 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3389 goto out; 3390 ip = mtod(m, struct ip *); 3391 3392 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, 3393 CSUM_DELAY_IP); 3394 if (error) 3395 goto out; 3396 3397 /* walk the chain and re-add the Ethernet header */ 3398 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3399 if (error == 0) { 3400 if (snap) { 3401 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT); 3402 if (m0 == NULL) { 3403 error = ENOBUFS; 3404 continue; 3405 } 3406 bcopy(llc, mtod(m0, caddr_t), 3407 sizeof(struct llc)); 3408 } 3409 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT); 3410 if (m0 == NULL) { 3411 error = ENOBUFS; 3412 continue; 3413 } 3414 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3415 } else 3416 m_freem(m); 3417 } 3418 3419 if (error == 0) 3420 V_ipstat.ips_fragmented++; 3421 3422 return (error); 3423 3424out: 3425 if (m != NULL) 3426 m_freem(m); 3427 return (error); 3428} 3429