2198 lines
49 KiB
C
2198 lines
49 KiB
C
/* $NetBSD: if_bridge.c,v 1.24 2004/04/21 19:10:31 itojun Exp $ */
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/*
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* Copyright 2001 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Jason R. Thorpe for Wasabi Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Jason L. Wright
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
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*/
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/*
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* Network interface bridge support.
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*
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* TODO:
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*
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* - Currently only supports Ethernet-like interfaces (Ethernet,
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* 802.11, VLANs on Ethernet, etc.) Figure out a nice way
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* to bridge other types of interfaces (FDDI-FDDI, and maybe
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* consider heterogenous bridges).
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.24 2004/04/21 19:10:31 itojun Exp $");
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#include "opt_bridge_ipf.h"
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#include "opt_inet.h"
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#include "opt_pfil_hooks.h"
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#include "bpfilter.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/pool.h>
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#if NBPFILTER > 0
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#include <net/bpf.h>
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#endif
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <net/if_llc.h>
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#include <net/if_ether.h>
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#include <net/if_bridgevar.h>
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#ifdef BRIDGE_IPF /* Used for bridge_ip[6]_checkbasic */
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip6.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/ip6_var.h>
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#endif /* BRIDGE_IPF */
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/*
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* Size of the route hash table. Must be a power of two.
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*/
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#ifndef BRIDGE_RTHASH_SIZE
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#define BRIDGE_RTHASH_SIZE 1024
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#endif
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#define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
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/*
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* Maximum number of addresses to cache.
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*/
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#ifndef BRIDGE_RTABLE_MAX
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#define BRIDGE_RTABLE_MAX 100
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#endif
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/*
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* Spanning tree defaults.
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*/
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#define BSTP_DEFAULT_MAX_AGE (20 * 256)
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#define BSTP_DEFAULT_HELLO_TIME (2 * 256)
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#define BSTP_DEFAULT_FORWARD_DELAY (15 * 256)
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#define BSTP_DEFAULT_HOLD_TIME (1 * 256)
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#define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000
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#define BSTP_DEFAULT_PORT_PRIORITY 0x80
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#define BSTP_DEFAULT_PATH_COST 55
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/*
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* Timeout (in seconds) for entries learned dynamically.
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*/
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#ifndef BRIDGE_RTABLE_TIMEOUT
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#define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
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#endif
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/*
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* Number of seconds between walks of the route list.
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*/
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#ifndef BRIDGE_RTABLE_PRUNE_PERIOD
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#define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
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#endif
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int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
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struct pool bridge_rtnode_pool;
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void bridgeattach(int);
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int bridge_clone_create(struct if_clone *, int);
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void bridge_clone_destroy(struct ifnet *);
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int bridge_ioctl(struct ifnet *, u_long, caddr_t);
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int bridge_init(struct ifnet *);
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void bridge_stop(struct ifnet *, int);
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void bridge_start(struct ifnet *);
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void bridge_forward(struct bridge_softc *, struct mbuf *m);
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void bridge_timer(void *);
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void bridge_broadcast(struct bridge_softc *, struct ifnet *, struct mbuf *);
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int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
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struct ifnet *, int, uint8_t);
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struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *);
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void bridge_rttrim(struct bridge_softc *);
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void bridge_rtage(struct bridge_softc *);
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void bridge_rtflush(struct bridge_softc *, int);
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int bridge_rtdaddr(struct bridge_softc *, const uint8_t *);
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void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp);
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int bridge_rtable_init(struct bridge_softc *);
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void bridge_rtable_fini(struct bridge_softc *);
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struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
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const uint8_t *);
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int bridge_rtnode_insert(struct bridge_softc *, struct bridge_rtnode *);
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void bridge_rtnode_destroy(struct bridge_softc *, struct bridge_rtnode *);
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struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
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const char *name);
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struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
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struct ifnet *ifp);
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void bridge_delete_member(struct bridge_softc *, struct bridge_iflist *);
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int bridge_ioctl_add(struct bridge_softc *, void *);
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int bridge_ioctl_del(struct bridge_softc *, void *);
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int bridge_ioctl_gifflags(struct bridge_softc *, void *);
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int bridge_ioctl_sifflags(struct bridge_softc *, void *);
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int bridge_ioctl_scache(struct bridge_softc *, void *);
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int bridge_ioctl_gcache(struct bridge_softc *, void *);
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int bridge_ioctl_gifs(struct bridge_softc *, void *);
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int bridge_ioctl_rts(struct bridge_softc *, void *);
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int bridge_ioctl_saddr(struct bridge_softc *, void *);
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int bridge_ioctl_sto(struct bridge_softc *, void *);
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int bridge_ioctl_gto(struct bridge_softc *, void *);
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int bridge_ioctl_daddr(struct bridge_softc *, void *);
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int bridge_ioctl_flush(struct bridge_softc *, void *);
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int bridge_ioctl_gpri(struct bridge_softc *, void *);
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int bridge_ioctl_spri(struct bridge_softc *, void *);
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int bridge_ioctl_ght(struct bridge_softc *, void *);
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int bridge_ioctl_sht(struct bridge_softc *, void *);
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int bridge_ioctl_gfd(struct bridge_softc *, void *);
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int bridge_ioctl_sfd(struct bridge_softc *, void *);
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int bridge_ioctl_gma(struct bridge_softc *, void *);
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int bridge_ioctl_sma(struct bridge_softc *, void *);
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int bridge_ioctl_sifprio(struct bridge_softc *, void *);
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int bridge_ioctl_sifcost(struct bridge_softc *, void *);
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#ifdef BRIDGE_IPF
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int bridge_ioctl_gfilt(struct bridge_softc *, void *);
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int bridge_ioctl_sfilt(struct bridge_softc *, void *);
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static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int);
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static int bridge_ip_checkbasic(struct mbuf **mp);
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# ifdef INET6
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static int bridge_ip6_checkbasic(struct mbuf **mp);
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# endif /* INET6 */
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#endif /* BRIDGE_IPF */
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struct bridge_control {
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int (*bc_func)(struct bridge_softc *, void *);
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int bc_argsize;
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int bc_flags;
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};
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#define BC_F_COPYIN 0x01 /* copy arguments in */
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#define BC_F_COPYOUT 0x02 /* copy arguments out */
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#define BC_F_SUSER 0x04 /* do super-user check */
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const struct bridge_control bridge_control_table[] = {
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{ bridge_ioctl_add, sizeof(struct ifbreq),
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BC_F_COPYIN|BC_F_SUSER },
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{ bridge_ioctl_del, sizeof(struct ifbreq),
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BC_F_COPYIN|BC_F_SUSER },
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{ bridge_ioctl_gifflags, sizeof(struct ifbreq),
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BC_F_COPYIN|BC_F_COPYOUT },
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{ bridge_ioctl_sifflags, sizeof(struct ifbreq),
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BC_F_COPYIN|BC_F_SUSER },
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{ bridge_ioctl_scache, sizeof(struct ifbrparam),
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BC_F_COPYIN|BC_F_SUSER },
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{ bridge_ioctl_gcache, sizeof(struct ifbrparam),
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BC_F_COPYOUT },
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{ bridge_ioctl_gifs, sizeof(struct ifbifconf),
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BC_F_COPYIN|BC_F_COPYOUT },
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{ bridge_ioctl_rts, sizeof(struct ifbaconf),
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BC_F_COPYIN|BC_F_COPYOUT },
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{ bridge_ioctl_saddr, sizeof(struct ifbareq),
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BC_F_COPYIN|BC_F_SUSER },
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{ bridge_ioctl_sto, sizeof(struct ifbrparam),
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BC_F_COPYIN|BC_F_SUSER },
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{ bridge_ioctl_gto, sizeof(struct ifbrparam),
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BC_F_COPYOUT },
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{ bridge_ioctl_daddr, sizeof(struct ifbareq),
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BC_F_COPYIN|BC_F_SUSER },
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{ bridge_ioctl_flush, sizeof(struct ifbreq),
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BC_F_COPYIN|BC_F_SUSER },
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{ bridge_ioctl_gpri, sizeof(struct ifbrparam),
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BC_F_COPYOUT },
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{ bridge_ioctl_spri, sizeof(struct ifbrparam),
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BC_F_COPYIN|BC_F_SUSER },
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{ bridge_ioctl_ght, sizeof(struct ifbrparam),
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BC_F_COPYOUT },
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{ bridge_ioctl_sht, sizeof(struct ifbrparam),
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BC_F_COPYIN|BC_F_SUSER },
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{ bridge_ioctl_gfd, sizeof(struct ifbrparam),
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BC_F_COPYOUT },
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{ bridge_ioctl_sfd, sizeof(struct ifbrparam),
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BC_F_COPYIN|BC_F_SUSER },
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{ bridge_ioctl_gma, sizeof(struct ifbrparam),
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BC_F_COPYOUT },
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{ bridge_ioctl_sma, sizeof(struct ifbrparam),
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BC_F_COPYIN|BC_F_SUSER },
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{ bridge_ioctl_sifprio, sizeof(struct ifbreq),
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BC_F_COPYIN|BC_F_SUSER },
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{ bridge_ioctl_sifcost, sizeof(struct ifbreq),
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BC_F_COPYIN|BC_F_SUSER },
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#ifdef BRIDGE_IPF
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{ bridge_ioctl_gfilt, sizeof(struct ifbrparam),
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BC_F_COPYOUT },
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{ bridge_ioctl_sfilt, sizeof(struct ifbrparam),
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BC_F_COPYIN|BC_F_SUSER },
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#endif /* BRIDGE_IPF */
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};
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const int bridge_control_table_size =
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sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
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LIST_HEAD(, bridge_softc) bridge_list;
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struct if_clone bridge_cloner =
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IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy);
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/*
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* bridgeattach:
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*
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* Pseudo-device attach routine.
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*/
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void
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bridgeattach(int n)
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{
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pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode),
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0, 0, 0, "brtpl", NULL);
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LIST_INIT(&bridge_list);
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if_clone_attach(&bridge_cloner);
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}
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/*
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* bridge_clone_create:
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*
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* Create a new bridge instance.
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*/
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int
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bridge_clone_create(struct if_clone *ifc, int unit)
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{
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struct bridge_softc *sc;
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struct ifnet *ifp;
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int s;
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sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK);
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memset(sc, 0, sizeof(*sc));
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ifp = &sc->sc_if;
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sc->sc_brtmax = BRIDGE_RTABLE_MAX;
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sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
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sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE;
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sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME;
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sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY;
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sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY;
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sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME;
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sc->sc_filter_flags = 0;
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/* Initialize our routing table. */
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bridge_rtable_init(sc);
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callout_init(&sc->sc_brcallout);
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callout_init(&sc->sc_bstpcallout);
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LIST_INIT(&sc->sc_iflist);
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snprintf(ifp->if_xname, sizeof(ifp->if_xname), "%s%d", ifc->ifc_name,
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unit);
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ifp->if_softc = sc;
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ifp->if_mtu = ETHERMTU;
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ifp->if_ioctl = bridge_ioctl;
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ifp->if_output = bridge_output;
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ifp->if_start = bridge_start;
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ifp->if_stop = bridge_stop;
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ifp->if_init = bridge_init;
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ifp->if_type = IFT_BRIDGE;
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ifp->if_addrlen = 0;
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ifp->if_dlt = DLT_EN10MB;
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ifp->if_hdrlen = ETHER_HDR_LEN;
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if_attach(ifp);
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if_alloc_sadl(ifp);
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s = splnet();
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LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
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splx(s);
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return (0);
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}
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/*
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* bridge_clone_destroy:
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*
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* Destroy a bridge instance.
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*/
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void
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bridge_clone_destroy(struct ifnet *ifp)
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{
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struct bridge_softc *sc = ifp->if_softc;
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struct bridge_iflist *bif;
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int s;
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s = splnet();
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bridge_stop(ifp, 1);
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while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
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bridge_delete_member(sc, bif);
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LIST_REMOVE(sc, sc_list);
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splx(s);
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if_detach(ifp);
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/* Tear down the routing table. */
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bridge_rtable_fini(sc);
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free(sc, M_DEVBUF);
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}
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/*
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* bridge_ioctl:
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*
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* Handle a control request from the operator.
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*/
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int
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bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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{
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struct bridge_softc *sc = ifp->if_softc;
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struct proc *p = curproc; /* XXX */
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union {
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struct ifbreq ifbreq;
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struct ifbifconf ifbifconf;
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struct ifbareq ifbareq;
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struct ifbaconf ifbaconf;
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struct ifbrparam ifbrparam;
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} args;
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struct ifdrv *ifd = (struct ifdrv *) data;
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const struct bridge_control *bc;
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int s, error = 0;
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s = splnet();
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switch (cmd) {
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case SIOCGDRVSPEC:
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case SIOCSDRVSPEC:
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if (ifd->ifd_cmd >= bridge_control_table_size) {
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error = EINVAL;
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break;
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}
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bc = &bridge_control_table[ifd->ifd_cmd];
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if (cmd == SIOCGDRVSPEC &&
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(bc->bc_flags & BC_F_COPYOUT) == 0) {
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error = EINVAL;
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break;
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}
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else if (cmd == SIOCSDRVSPEC &&
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(bc->bc_flags & BC_F_COPYOUT) != 0) {
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error = EINVAL;
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break;
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}
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if (bc->bc_flags & BC_F_SUSER) {
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error = suser(p->p_ucred, &p->p_acflag);
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if (error)
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break;
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}
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if (ifd->ifd_len != bc->bc_argsize ||
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|
ifd->ifd_len > sizeof(args)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (bc->bc_flags & BC_F_COPYIN) {
|
|
error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
|
|
if (error)
|
|
break;
|
|
}
|
|
|
|
error = (*bc->bc_func)(sc, &args);
|
|
if (error)
|
|
break;
|
|
|
|
if (bc->bc_flags & BC_F_COPYOUT)
|
|
error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
|
|
|
|
break;
|
|
|
|
case SIOCSIFFLAGS:
|
|
if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) {
|
|
/*
|
|
* If interface is marked down and it is running,
|
|
* then stop and disable it.
|
|
*/
|
|
(*ifp->if_stop)(ifp, 1);
|
|
} else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) {
|
|
/*
|
|
* If interface is marked up and it is stopped, then
|
|
* start it.
|
|
*/
|
|
error = (*ifp->if_init)(ifp);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
error = ENOTTY;
|
|
break;
|
|
}
|
|
|
|
splx(s);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* bridge_lookup_member:
|
|
*
|
|
* Lookup a bridge member interface. Must be called at splnet().
|
|
*/
|
|
struct bridge_iflist *
|
|
bridge_lookup_member(struct bridge_softc *sc, const char *name)
|
|
{
|
|
struct bridge_iflist *bif;
|
|
struct ifnet *ifp;
|
|
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
ifp = bif->bif_ifp;
|
|
if (strcmp(ifp->if_xname, name) == 0)
|
|
return (bif);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* bridge_lookup_member_if:
|
|
*
|
|
* Lookup a bridge member interface by ifnet*. Must be called at splnet().
|
|
*/
|
|
struct bridge_iflist *
|
|
bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
|
|
{
|
|
struct bridge_iflist *bif;
|
|
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
if (bif->bif_ifp == member_ifp)
|
|
return (bif);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* bridge_delete_member:
|
|
*
|
|
* Delete the specified member interface.
|
|
*/
|
|
void
|
|
bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif)
|
|
{
|
|
struct ifnet *ifs = bif->bif_ifp;
|
|
|
|
switch (ifs->if_type) {
|
|
case IFT_ETHER:
|
|
/*
|
|
* Take the interface out of promiscuous mode.
|
|
*/
|
|
(void) ifpromisc(ifs, 0);
|
|
break;
|
|
|
|
default:
|
|
#ifdef DIAGNOSTIC
|
|
panic("bridge_delete_member: impossible");
|
|
#endif
|
|
break;
|
|
}
|
|
|
|
ifs->if_bridge = NULL;
|
|
LIST_REMOVE(bif, bif_next);
|
|
|
|
bridge_rtdelete(sc, ifs);
|
|
|
|
free(bif, M_DEVBUF);
|
|
|
|
if (sc->sc_if.if_flags & IFF_RUNNING)
|
|
bstp_initialization(sc);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_add(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbreq *req = arg;
|
|
struct bridge_iflist *bif = NULL;
|
|
struct ifnet *ifs;
|
|
int error = 0;
|
|
|
|
ifs = ifunit(req->ifbr_ifsname);
|
|
if (ifs == NULL)
|
|
return (ENOENT);
|
|
|
|
if (sc->sc_if.if_mtu != ifs->if_mtu)
|
|
return (EINVAL);
|
|
|
|
if (ifs->if_bridge == sc)
|
|
return (EEXIST);
|
|
|
|
if (ifs->if_bridge != NULL)
|
|
return (EBUSY);
|
|
|
|
bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT);
|
|
if (bif == NULL)
|
|
return (ENOMEM);
|
|
|
|
switch (ifs->if_type) {
|
|
case IFT_ETHER:
|
|
/*
|
|
* Place the interface into promiscuous mode.
|
|
*/
|
|
error = ifpromisc(ifs, 1);
|
|
if (error)
|
|
goto out;
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
bif->bif_ifp = ifs;
|
|
bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
|
|
bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY;
|
|
bif->bif_path_cost = BSTP_DEFAULT_PATH_COST;
|
|
|
|
ifs->if_bridge = sc;
|
|
LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
|
|
|
|
if (sc->sc_if.if_flags & IFF_RUNNING)
|
|
bstp_initialization(sc);
|
|
else
|
|
bstp_stop(sc);
|
|
|
|
out:
|
|
if (error) {
|
|
if (bif != NULL)
|
|
free(bif, M_DEVBUF);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_del(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbreq *req = arg;
|
|
struct bridge_iflist *bif;
|
|
|
|
bif = bridge_lookup_member(sc, req->ifbr_ifsname);
|
|
if (bif == NULL)
|
|
return (ENOENT);
|
|
|
|
bridge_delete_member(sc, bif);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbreq *req = arg;
|
|
struct bridge_iflist *bif;
|
|
|
|
bif = bridge_lookup_member(sc, req->ifbr_ifsname);
|
|
if (bif == NULL)
|
|
return (ENOENT);
|
|
|
|
req->ifbr_ifsflags = bif->bif_flags;
|
|
req->ifbr_state = bif->bif_state;
|
|
req->ifbr_priority = bif->bif_priority;
|
|
req->ifbr_path_cost = bif->bif_path_cost;
|
|
req->ifbr_portno = bif->bif_ifp->if_index & 0xff;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbreq *req = arg;
|
|
struct bridge_iflist *bif;
|
|
|
|
bif = bridge_lookup_member(sc, req->ifbr_ifsname);
|
|
if (bif == NULL)
|
|
return (ENOENT);
|
|
|
|
if (req->ifbr_ifsflags & IFBIF_STP) {
|
|
switch (bif->bif_ifp->if_type) {
|
|
case IFT_ETHER:
|
|
/* These can do spanning tree. */
|
|
break;
|
|
|
|
default:
|
|
/* Nothing else can. */
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
|
|
bif->bif_flags = req->ifbr_ifsflags;
|
|
|
|
if (sc->sc_if.if_flags & IFF_RUNNING)
|
|
bstp_initialization(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbrparam *param = arg;
|
|
|
|
sc->sc_brtmax = param->ifbrp_csize;
|
|
bridge_rttrim(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbrparam *param = arg;
|
|
|
|
param->ifbrp_csize = sc->sc_brtmax;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbifconf *bifc = arg;
|
|
struct bridge_iflist *bif;
|
|
struct ifbreq breq;
|
|
int count, len, error = 0;
|
|
|
|
count = 0;
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
|
|
count++;
|
|
|
|
if (bifc->ifbic_len == 0) {
|
|
bifc->ifbic_len = sizeof(breq) * count;
|
|
return (0);
|
|
}
|
|
|
|
count = 0;
|
|
len = bifc->ifbic_len;
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
if (len < sizeof(breq))
|
|
break;
|
|
|
|
strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
|
|
sizeof(breq.ifbr_ifsname));
|
|
breq.ifbr_ifsflags = bif->bif_flags;
|
|
breq.ifbr_state = bif->bif_state;
|
|
breq.ifbr_priority = bif->bif_priority;
|
|
breq.ifbr_path_cost = bif->bif_path_cost;
|
|
breq.ifbr_portno = bif->bif_ifp->if_index & 0xff;
|
|
error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq));
|
|
if (error)
|
|
break;
|
|
count++;
|
|
len -= sizeof(breq);
|
|
}
|
|
|
|
bifc->ifbic_len = sizeof(breq) * count;
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbaconf *bac = arg;
|
|
struct bridge_rtnode *brt;
|
|
struct ifbareq bareq;
|
|
int count = 0, error = 0, len;
|
|
|
|
if (bac->ifbac_len == 0)
|
|
return (0);
|
|
|
|
len = bac->ifbac_len;
|
|
LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
|
|
if (len < sizeof(bareq))
|
|
goto out;
|
|
strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
|
|
sizeof(bareq.ifba_ifsname));
|
|
memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
|
|
if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
|
|
bareq.ifba_expire = brt->brt_expire - mono_time.tv_sec;
|
|
else
|
|
bareq.ifba_expire = 0;
|
|
bareq.ifba_flags = brt->brt_flags;
|
|
|
|
error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq));
|
|
if (error)
|
|
goto out;
|
|
count++;
|
|
len -= sizeof(bareq);
|
|
}
|
|
out:
|
|
bac->ifbac_len = sizeof(bareq) * count;
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbareq *req = arg;
|
|
struct bridge_iflist *bif;
|
|
int error;
|
|
|
|
bif = bridge_lookup_member(sc, req->ifba_ifsname);
|
|
if (bif == NULL)
|
|
return (ENOENT);
|
|
|
|
error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1,
|
|
req->ifba_flags);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbrparam *param = arg;
|
|
|
|
sc->sc_brttimeout = param->ifbrp_ctime;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbrparam *param = arg;
|
|
|
|
param->ifbrp_ctime = sc->sc_brttimeout;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbareq *req = arg;
|
|
|
|
return (bridge_rtdaddr(sc, req->ifba_dst));
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbreq *req = arg;
|
|
|
|
bridge_rtflush(sc, req->ifbr_ifsflags);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbrparam *param = arg;
|
|
|
|
param->ifbrp_prio = sc->sc_bridge_priority;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbrparam *param = arg;
|
|
|
|
sc->sc_bridge_priority = param->ifbrp_prio;
|
|
|
|
if (sc->sc_if.if_flags & IFF_RUNNING)
|
|
bstp_initialization(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbrparam *param = arg;
|
|
|
|
param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbrparam *param = arg;
|
|
|
|
if (param->ifbrp_hellotime == 0)
|
|
return (EINVAL);
|
|
sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8;
|
|
|
|
if (sc->sc_if.if_flags & IFF_RUNNING)
|
|
bstp_initialization(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbrparam *param = arg;
|
|
|
|
param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbrparam *param = arg;
|
|
|
|
if (param->ifbrp_fwddelay == 0)
|
|
return (EINVAL);
|
|
sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8;
|
|
|
|
if (sc->sc_if.if_flags & IFF_RUNNING)
|
|
bstp_initialization(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbrparam *param = arg;
|
|
|
|
param->ifbrp_maxage = sc->sc_bridge_max_age >> 8;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbrparam *param = arg;
|
|
|
|
if (param->ifbrp_maxage == 0)
|
|
return (EINVAL);
|
|
sc->sc_bridge_max_age = param->ifbrp_maxage << 8;
|
|
|
|
if (sc->sc_if.if_flags & IFF_RUNNING)
|
|
bstp_initialization(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbreq *req = arg;
|
|
struct bridge_iflist *bif;
|
|
|
|
bif = bridge_lookup_member(sc, req->ifbr_ifsname);
|
|
if (bif == NULL)
|
|
return (ENOENT);
|
|
|
|
bif->bif_priority = req->ifbr_priority;
|
|
|
|
if (sc->sc_if.if_flags & IFF_RUNNING)
|
|
bstp_initialization(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
#ifdef BRIDGE_IPF
|
|
int
|
|
bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbrparam *param = arg;
|
|
|
|
param->ifbrp_filter = sc->sc_filter_flags;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbrparam *param = arg;
|
|
uint32_t nflags, oflags;
|
|
|
|
if (param->ifbrp_filter & ~IFBF_FILT_MASK)
|
|
return (EINVAL);
|
|
|
|
nflags = param->ifbrp_filter;
|
|
oflags = sc->sc_filter_flags;
|
|
|
|
if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) {
|
|
pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT,
|
|
&sc->sc_if.if_pfil);
|
|
}
|
|
if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) {
|
|
pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT,
|
|
&sc->sc_if.if_pfil);
|
|
}
|
|
|
|
sc->sc_filter_flags = nflags;
|
|
|
|
return (0);
|
|
}
|
|
#endif /* BRIDGE_IPF */
|
|
|
|
int
|
|
bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
|
|
{
|
|
struct ifbreq *req = arg;
|
|
struct bridge_iflist *bif;
|
|
|
|
bif = bridge_lookup_member(sc, req->ifbr_ifsname);
|
|
if (bif == NULL)
|
|
return (ENOENT);
|
|
|
|
bif->bif_path_cost = req->ifbr_path_cost;
|
|
|
|
if (sc->sc_if.if_flags & IFF_RUNNING)
|
|
bstp_initialization(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* bridge_ifdetach:
|
|
*
|
|
* Detach an interface from a bridge. Called when a member
|
|
* interface is detaching.
|
|
*/
|
|
void
|
|
bridge_ifdetach(struct ifnet *ifp)
|
|
{
|
|
struct bridge_softc *sc = ifp->if_bridge;
|
|
struct ifbreq breq;
|
|
|
|
memset(&breq, 0, sizeof(breq));
|
|
snprintf(breq.ifbr_ifsname, sizeof(breq.ifbr_ifsname), ifp->if_xname);
|
|
|
|
(void) bridge_ioctl_del(sc, &breq);
|
|
}
|
|
|
|
/*
|
|
* bridge_init:
|
|
*
|
|
* Initialize a bridge interface.
|
|
*/
|
|
int
|
|
bridge_init(struct ifnet *ifp)
|
|
{
|
|
struct bridge_softc *sc = ifp->if_softc;
|
|
|
|
if (ifp->if_flags & IFF_RUNNING)
|
|
return (0);
|
|
|
|
callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
|
|
bridge_timer, sc);
|
|
|
|
ifp->if_flags |= IFF_RUNNING;
|
|
bstp_initialization(sc);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* bridge_stop:
|
|
*
|
|
* Stop the bridge interface.
|
|
*/
|
|
void
|
|
bridge_stop(struct ifnet *ifp, int disable)
|
|
{
|
|
struct bridge_softc *sc = ifp->if_softc;
|
|
|
|
if ((ifp->if_flags & IFF_RUNNING) == 0)
|
|
return;
|
|
|
|
callout_stop(&sc->sc_brcallout);
|
|
bstp_stop(sc);
|
|
|
|
IF_PURGE(&ifp->if_snd);
|
|
|
|
bridge_rtflush(sc, IFBF_FLUSHDYN);
|
|
|
|
ifp->if_flags &= ~IFF_RUNNING;
|
|
}
|
|
|
|
/*
|
|
* bridge_enqueue:
|
|
*
|
|
* Enqueue a packet on a bridge member interface.
|
|
*
|
|
* NOTE: must be called at splnet().
|
|
*/
|
|
__inline void
|
|
bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m,
|
|
int runfilt)
|
|
{
|
|
ALTQ_DECL(struct altq_pktattr pktattr;)
|
|
int len, error;
|
|
short mflags;
|
|
|
|
#ifdef PFIL_HOOKS
|
|
if (runfilt) {
|
|
if (pfil_run_hooks(&sc->sc_if.if_pfil, &m,
|
|
dst_ifp, PFIL_OUT) != 0) {
|
|
if (m != NULL)
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
if (m == NULL)
|
|
return;
|
|
}
|
|
#endif /* PFIL_HOOKS */
|
|
|
|
#ifdef ALTQ
|
|
/*
|
|
* If ALTQ is enabled on the member interface, do
|
|
* classification; the queueing discipline might
|
|
* not require classification, but might require
|
|
* the address family/header pointer in the pktattr.
|
|
*/
|
|
if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) {
|
|
/* XXX IFT_ETHER */
|
|
altq_etherclassify(&dst_ifp->if_snd, m, &pktattr);
|
|
}
|
|
#endif /* ALTQ */
|
|
|
|
len = m->m_pkthdr.len;
|
|
mflags = m->m_flags;
|
|
IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error);
|
|
if (error) {
|
|
/* mbuf is already freed */
|
|
sc->sc_if.if_oerrors++;
|
|
return;
|
|
}
|
|
|
|
sc->sc_if.if_opackets++;
|
|
sc->sc_if.if_obytes += len;
|
|
|
|
dst_ifp->if_obytes += len;
|
|
|
|
if (mflags & M_MCAST) {
|
|
sc->sc_if.if_omcasts++;
|
|
dst_ifp->if_omcasts++;
|
|
}
|
|
|
|
if ((dst_ifp->if_flags & IFF_OACTIVE) == 0)
|
|
(*dst_ifp->if_start)(dst_ifp);
|
|
}
|
|
|
|
/*
|
|
* bridge_output:
|
|
*
|
|
* Send output from a bridge member interface. This
|
|
* performs the bridging function for locally originated
|
|
* packets.
|
|
*
|
|
* The mbuf has the Ethernet header already attached. We must
|
|
* enqueue or free the mbuf before returning.
|
|
*/
|
|
int
|
|
bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
|
|
struct rtentry *rt)
|
|
{
|
|
struct ether_header *eh;
|
|
struct ifnet *dst_if;
|
|
struct bridge_softc *sc;
|
|
int s;
|
|
|
|
if (m->m_len < ETHER_HDR_LEN) {
|
|
m = m_pullup(m, ETHER_HDR_LEN);
|
|
if (m == NULL)
|
|
return (0);
|
|
}
|
|
|
|
eh = mtod(m, struct ether_header *);
|
|
sc = ifp->if_bridge;
|
|
|
|
s = splnet();
|
|
|
|
/*
|
|
* If bridge is down, but the original output interface is up,
|
|
* go ahead and send out that interface. Otherwise, the packet
|
|
* is dropped below.
|
|
*/
|
|
if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) {
|
|
dst_if = ifp;
|
|
goto sendunicast;
|
|
}
|
|
|
|
/*
|
|
* If the packet is a multicast, or we don't know a better way to
|
|
* get there, send to all interfaces.
|
|
*/
|
|
if (ETHER_IS_MULTICAST(eh->ether_dhost))
|
|
dst_if = NULL;
|
|
else
|
|
dst_if = bridge_rtlookup(sc, eh->ether_dhost);
|
|
if (dst_if == NULL) {
|
|
struct bridge_iflist *bif;
|
|
struct mbuf *mc;
|
|
int used = 0;
|
|
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
dst_if = bif->bif_ifp;
|
|
if ((dst_if->if_flags & IFF_RUNNING) == 0)
|
|
continue;
|
|
|
|
/*
|
|
* If this is not the original output interface,
|
|
* and the interface is participating in spanning
|
|
* tree, make sure the port is in a state that
|
|
* allows forwarding.
|
|
*/
|
|
if (dst_if != ifp &&
|
|
(bif->bif_flags & IFBIF_STP) != 0) {
|
|
switch (bif->bif_state) {
|
|
case BSTP_IFSTATE_BLOCKING:
|
|
case BSTP_IFSTATE_LISTENING:
|
|
case BSTP_IFSTATE_DISABLED:
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (LIST_NEXT(bif, bif_next) == NULL) {
|
|
used = 1;
|
|
mc = m;
|
|
} else {
|
|
mc = m_copym(m, 0, M_COPYALL, M_NOWAIT);
|
|
if (mc == NULL) {
|
|
sc->sc_if.if_oerrors++;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
bridge_enqueue(sc, dst_if, mc, 0);
|
|
}
|
|
if (used == 0)
|
|
m_freem(m);
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
|
|
sendunicast:
|
|
/*
|
|
* XXX Spanning tree consideration here?
|
|
*/
|
|
|
|
if ((dst_if->if_flags & IFF_RUNNING) == 0) {
|
|
m_freem(m);
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
|
|
bridge_enqueue(sc, dst_if, m, 0);
|
|
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* bridge_start:
|
|
*
|
|
* Start output on a bridge.
|
|
*
|
|
* NOTE: This routine should never be called in this implementation.
|
|
*/
|
|
void
|
|
bridge_start(struct ifnet *ifp)
|
|
{
|
|
|
|
printf("%s: bridge_start() called\n", ifp->if_xname);
|
|
}
|
|
|
|
/*
|
|
* bridge_forward:
|
|
*
|
|
* The forwarding function of the bridge.
|
|
*/
|
|
void
|
|
bridge_forward(struct bridge_softc *sc, struct mbuf *m)
|
|
{
|
|
struct bridge_iflist *bif;
|
|
struct ifnet *src_if, *dst_if;
|
|
struct ether_header *eh;
|
|
|
|
src_if = m->m_pkthdr.rcvif;
|
|
|
|
sc->sc_if.if_ipackets++;
|
|
sc->sc_if.if_ibytes += m->m_pkthdr.len;
|
|
|
|
/*
|
|
* Look up the bridge_iflist.
|
|
*/
|
|
bif = bridge_lookup_member_if(sc, src_if);
|
|
if (bif == NULL) {
|
|
/* Interface is not a bridge member (anymore?) */
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
if (bif->bif_flags & IFBIF_STP) {
|
|
switch (bif->bif_state) {
|
|
case BSTP_IFSTATE_BLOCKING:
|
|
case BSTP_IFSTATE_LISTENING:
|
|
case BSTP_IFSTATE_DISABLED:
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
}
|
|
|
|
eh = mtod(m, struct ether_header *);
|
|
|
|
/*
|
|
* If the interface is learning, and the source
|
|
* address is valid and not multicast, record
|
|
* the address.
|
|
*/
|
|
if ((bif->bif_flags & IFBIF_LEARNING) != 0 &&
|
|
ETHER_IS_MULTICAST(eh->ether_shost) == 0 &&
|
|
(eh->ether_shost[0] == 0 &&
|
|
eh->ether_shost[1] == 0 &&
|
|
eh->ether_shost[2] == 0 &&
|
|
eh->ether_shost[3] == 0 &&
|
|
eh->ether_shost[4] == 0 &&
|
|
eh->ether_shost[5] == 0) == 0) {
|
|
(void) bridge_rtupdate(sc, eh->ether_shost,
|
|
src_if, 0, IFBAF_DYNAMIC);
|
|
}
|
|
|
|
if ((bif->bif_flags & IFBIF_STP) != 0 &&
|
|
bif->bif_state == BSTP_IFSTATE_LEARNING) {
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* At this point, the port either doesn't participate
|
|
* in spanning tree or it is in the forwarding state.
|
|
*/
|
|
|
|
/*
|
|
* If the packet is unicast, destined for someone on
|
|
* "this" side of the bridge, drop it.
|
|
*/
|
|
if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
|
|
dst_if = bridge_rtlookup(sc, eh->ether_dhost);
|
|
if (src_if == dst_if) {
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
} else {
|
|
/* ...forward it to all interfaces. */
|
|
sc->sc_if.if_imcasts++;
|
|
dst_if = NULL;
|
|
}
|
|
|
|
#ifdef PFIL_HOOKS
|
|
if (pfil_run_hooks(&sc->sc_if.if_pfil, &m,
|
|
m->m_pkthdr.rcvif, PFIL_IN) != 0) {
|
|
if (m != NULL)
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
if (m == NULL)
|
|
return;
|
|
#endif /* PFIL_HOOKS */
|
|
|
|
if (dst_if == NULL) {
|
|
bridge_broadcast(sc, src_if, m);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* At this point, we're dealing with a unicast frame
|
|
* going to a different interface.
|
|
*/
|
|
if ((dst_if->if_flags & IFF_RUNNING) == 0) {
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
bif = bridge_lookup_member_if(sc, dst_if);
|
|
if (bif == NULL) {
|
|
/* Not a member of the bridge (anymore?) */
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
if (bif->bif_flags & IFBIF_STP) {
|
|
switch (bif->bif_state) {
|
|
case BSTP_IFSTATE_DISABLED:
|
|
case BSTP_IFSTATE_BLOCKING:
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
}
|
|
|
|
bridge_enqueue(sc, dst_if, m, 1);
|
|
}
|
|
|
|
/*
|
|
* bridge_input:
|
|
*
|
|
* Receive input from a member interface. Queue the packet for
|
|
* bridging if it is not for us.
|
|
*/
|
|
struct mbuf *
|
|
bridge_input(struct ifnet *ifp, struct mbuf *m)
|
|
{
|
|
struct bridge_softc *sc = ifp->if_bridge;
|
|
struct bridge_iflist *bif;
|
|
struct ether_header *eh;
|
|
struct mbuf *mc;
|
|
|
|
if ((sc->sc_if.if_flags & IFF_RUNNING) == 0)
|
|
return (m);
|
|
|
|
bif = bridge_lookup_member_if(sc, ifp);
|
|
if (bif == NULL)
|
|
return (m);
|
|
|
|
eh = mtod(m, struct ether_header *);
|
|
|
|
if (m->m_flags & (M_BCAST|M_MCAST)) {
|
|
/* Tap off 802.1D packets; they do not get forwarded. */
|
|
if (memcmp(eh->ether_dhost, bstp_etheraddr,
|
|
ETHER_ADDR_LEN) == 0) {
|
|
m = bstp_input(ifp, m);
|
|
if (m == NULL)
|
|
return (NULL);
|
|
}
|
|
|
|
if (bif->bif_flags & IFBIF_STP) {
|
|
switch (bif->bif_state) {
|
|
case BSTP_IFSTATE_BLOCKING:
|
|
case BSTP_IFSTATE_LISTENING:
|
|
case BSTP_IFSTATE_DISABLED:
|
|
return (m);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Make a deep copy of the packet and enqueue the copy
|
|
* for bridge processing; return the original packet for
|
|
* local processing.
|
|
*/
|
|
mc = m_dup(m, 0, M_COPYALL, M_NOWAIT);
|
|
if (mc == NULL)
|
|
return (m);
|
|
|
|
/* Perform the bridge forwarding function with the copy. */
|
|
bridge_forward(sc, mc);
|
|
|
|
/* Return the original packet for local processing. */
|
|
return (m);
|
|
}
|
|
|
|
if (bif->bif_flags & IFBIF_STP) {
|
|
switch (bif->bif_state) {
|
|
case BSTP_IFSTATE_BLOCKING:
|
|
case BSTP_IFSTATE_LISTENING:
|
|
case BSTP_IFSTATE_DISABLED:
|
|
return (m);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Unicast. Make sure it's not for us.
|
|
*/
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
/* It is destined for us. */
|
|
if (memcmp(LLADDR(bif->bif_ifp->if_sadl), eh->ether_dhost,
|
|
ETHER_ADDR_LEN) == 0) {
|
|
if (bif->bif_flags & IFBIF_LEARNING)
|
|
(void) bridge_rtupdate(sc,
|
|
eh->ether_shost, ifp, 0, IFBAF_DYNAMIC);
|
|
m->m_pkthdr.rcvif = bif->bif_ifp;
|
|
return (m);
|
|
}
|
|
|
|
/* We just received a packet that we sent out. */
|
|
if (memcmp(LLADDR(bif->bif_ifp->if_sadl), eh->ether_shost,
|
|
ETHER_ADDR_LEN) == 0) {
|
|
m_freem(m);
|
|
return (NULL);
|
|
}
|
|
}
|
|
|
|
/* Perform the bridge forwarding function. */
|
|
bridge_forward(sc, m);
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* bridge_broadcast:
|
|
*
|
|
* Send a frame to all interfaces that are members of
|
|
* the bridge, except for the one on which the packet
|
|
* arrived.
|
|
*/
|
|
void
|
|
bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
|
|
struct mbuf *m)
|
|
{
|
|
struct bridge_iflist *bif;
|
|
struct mbuf *mc;
|
|
struct ifnet *dst_if;
|
|
int used = 0;
|
|
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
dst_if = bif->bif_ifp;
|
|
if (dst_if == src_if)
|
|
continue;
|
|
|
|
if (bif->bif_flags & IFBIF_STP) {
|
|
switch (bif->bif_state) {
|
|
case BSTP_IFSTATE_BLOCKING:
|
|
case BSTP_IFSTATE_DISABLED:
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if ((bif->bif_flags & IFBIF_DISCOVER) == 0 &&
|
|
(m->m_flags & (M_BCAST|M_MCAST)) == 0)
|
|
continue;
|
|
|
|
if ((dst_if->if_flags & IFF_RUNNING) == 0)
|
|
continue;
|
|
|
|
if (LIST_NEXT(bif, bif_next) == NULL) {
|
|
mc = m;
|
|
used = 1;
|
|
} else {
|
|
mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT);
|
|
if (mc == NULL) {
|
|
sc->sc_if.if_oerrors++;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
bridge_enqueue(sc, dst_if, mc, 1);
|
|
}
|
|
if (used == 0)
|
|
m_freem(m);
|
|
}
|
|
|
|
/*
|
|
* bridge_rtupdate:
|
|
*
|
|
* Add a bridge routing entry.
|
|
*/
|
|
int
|
|
bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst,
|
|
struct ifnet *dst_if, int setflags, uint8_t flags)
|
|
{
|
|
struct bridge_rtnode *brt;
|
|
int error;
|
|
|
|
/*
|
|
* A route for this destination might already exist. If so,
|
|
* update it, otherwise create a new one.
|
|
*/
|
|
if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) {
|
|
if (sc->sc_brtcnt >= sc->sc_brtmax)
|
|
return (ENOSPC);
|
|
|
|
/*
|
|
* Allocate a new bridge forwarding node, and
|
|
* initialize the expiration time and Ethernet
|
|
* address.
|
|
*/
|
|
brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT);
|
|
if (brt == NULL)
|
|
return (ENOMEM);
|
|
|
|
memset(brt, 0, sizeof(*brt));
|
|
brt->brt_expire = mono_time.tv_sec + sc->sc_brttimeout;
|
|
brt->brt_flags = IFBAF_DYNAMIC;
|
|
memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
|
|
|
|
if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
|
|
pool_put(&bridge_rtnode_pool, brt);
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
brt->brt_ifp = dst_if;
|
|
if (setflags) {
|
|
brt->brt_flags = flags;
|
|
brt->brt_expire = (flags & IFBAF_STATIC) ? 0 :
|
|
mono_time.tv_sec + sc->sc_brttimeout;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* bridge_rtlookup:
|
|
*
|
|
* Lookup the destination interface for an address.
|
|
*/
|
|
struct ifnet *
|
|
bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr)
|
|
{
|
|
struct bridge_rtnode *brt;
|
|
|
|
if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL)
|
|
return (NULL);
|
|
|
|
return (brt->brt_ifp);
|
|
}
|
|
|
|
/*
|
|
* bridge_rttrim:
|
|
*
|
|
* Trim the routine table so that we have a number
|
|
* of routing entries less than or equal to the
|
|
* maximum number.
|
|
*/
|
|
void
|
|
bridge_rttrim(struct bridge_softc *sc)
|
|
{
|
|
struct bridge_rtnode *brt, *nbrt;
|
|
|
|
/* Make sure we actually need to do this. */
|
|
if (sc->sc_brtcnt <= sc->sc_brtmax)
|
|
return;
|
|
|
|
/* Force an aging cycle; this might trim enough addresses. */
|
|
bridge_rtage(sc);
|
|
if (sc->sc_brtcnt <= sc->sc_brtmax)
|
|
return;
|
|
|
|
for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) {
|
|
nbrt = LIST_NEXT(brt, brt_list);
|
|
if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
|
|
bridge_rtnode_destroy(sc, brt);
|
|
if (sc->sc_brtcnt <= sc->sc_brtmax)
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* bridge_timer:
|
|
*
|
|
* Aging timer for the bridge.
|
|
*/
|
|
void
|
|
bridge_timer(void *arg)
|
|
{
|
|
struct bridge_softc *sc = arg;
|
|
int s;
|
|
|
|
s = splnet();
|
|
bridge_rtage(sc);
|
|
splx(s);
|
|
|
|
if (sc->sc_if.if_flags & IFF_RUNNING)
|
|
callout_reset(&sc->sc_brcallout,
|
|
bridge_rtable_prune_period * hz, bridge_timer, sc);
|
|
}
|
|
|
|
/*
|
|
* bridge_rtage:
|
|
*
|
|
* Perform an aging cycle.
|
|
*/
|
|
void
|
|
bridge_rtage(struct bridge_softc *sc)
|
|
{
|
|
struct bridge_rtnode *brt, *nbrt;
|
|
|
|
for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) {
|
|
nbrt = LIST_NEXT(brt, brt_list);
|
|
if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
|
|
if (mono_time.tv_sec >= brt->brt_expire)
|
|
bridge_rtnode_destroy(sc, brt);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* bridge_rtflush:
|
|
*
|
|
* Remove all dynamic addresses from the bridge.
|
|
*/
|
|
void
|
|
bridge_rtflush(struct bridge_softc *sc, int full)
|
|
{
|
|
struct bridge_rtnode *brt, *nbrt;
|
|
|
|
for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) {
|
|
nbrt = LIST_NEXT(brt, brt_list);
|
|
if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
|
|
bridge_rtnode_destroy(sc, brt);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* bridge_rtdaddr:
|
|
*
|
|
* Remove an address from the table.
|
|
*/
|
|
int
|
|
bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr)
|
|
{
|
|
struct bridge_rtnode *brt;
|
|
|
|
if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL)
|
|
return (ENOENT);
|
|
|
|
bridge_rtnode_destroy(sc, brt);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* bridge_rtdelete:
|
|
*
|
|
* Delete routes to a speicifc member interface.
|
|
*/
|
|
void
|
|
bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp)
|
|
{
|
|
struct bridge_rtnode *brt, *nbrt;
|
|
|
|
for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) {
|
|
nbrt = LIST_NEXT(brt, brt_list);
|
|
if (brt->brt_ifp == ifp)
|
|
bridge_rtnode_destroy(sc, brt);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* bridge_rtable_init:
|
|
*
|
|
* Initialize the route table for this bridge.
|
|
*/
|
|
int
|
|
bridge_rtable_init(struct bridge_softc *sc)
|
|
{
|
|
int i;
|
|
|
|
sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
|
|
M_DEVBUF, M_NOWAIT);
|
|
if (sc->sc_rthash == NULL)
|
|
return (ENOMEM);
|
|
|
|
for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
|
|
LIST_INIT(&sc->sc_rthash[i]);
|
|
|
|
sc->sc_rthash_key = arc4random();
|
|
|
|
LIST_INIT(&sc->sc_rtlist);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* bridge_rtable_fini:
|
|
*
|
|
* Deconstruct the route table for this bridge.
|
|
*/
|
|
void
|
|
bridge_rtable_fini(struct bridge_softc *sc)
|
|
{
|
|
|
|
free(sc->sc_rthash, M_DEVBUF);
|
|
}
|
|
|
|
/*
|
|
* The following hash function is adapted from "Hash Functions" by Bob Jenkins
|
|
* ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
|
|
*/
|
|
#define mix(a, b, c) \
|
|
do { \
|
|
a -= b; a -= c; a ^= (c >> 13); \
|
|
b -= c; b -= a; b ^= (a << 8); \
|
|
c -= a; c -= b; c ^= (b >> 13); \
|
|
a -= b; a -= c; a ^= (c >> 12); \
|
|
b -= c; b -= a; b ^= (a << 16); \
|
|
c -= a; c -= b; c ^= (b >> 5); \
|
|
a -= b; a -= c; a ^= (c >> 3); \
|
|
b -= c; b -= a; b ^= (a << 10); \
|
|
c -= a; c -= b; c ^= (b >> 15); \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
static __inline uint32_t
|
|
bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
|
|
{
|
|
uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
|
|
|
|
b += addr[5] << 8;
|
|
b += addr[4];
|
|
a += addr[3] << 24;
|
|
a += addr[2] << 16;
|
|
a += addr[1] << 8;
|
|
a += addr[0];
|
|
|
|
mix(a, b, c);
|
|
|
|
return (c & BRIDGE_RTHASH_MASK);
|
|
}
|
|
|
|
#undef mix
|
|
|
|
/*
|
|
* bridge_rtnode_lookup:
|
|
*
|
|
* Look up a bridge route node for the specified destination.
|
|
*/
|
|
struct bridge_rtnode *
|
|
bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr)
|
|
{
|
|
struct bridge_rtnode *brt;
|
|
uint32_t hash;
|
|
int dir;
|
|
|
|
hash = bridge_rthash(sc, addr);
|
|
LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
|
|
dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN);
|
|
if (dir == 0)
|
|
return (brt);
|
|
if (dir > 0)
|
|
return (NULL);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* bridge_rtnode_insert:
|
|
*
|
|
* Insert the specified bridge node into the route table. We
|
|
* assume the entry is not already in the table.
|
|
*/
|
|
int
|
|
bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
|
|
{
|
|
struct bridge_rtnode *lbrt;
|
|
uint32_t hash;
|
|
int dir;
|
|
|
|
hash = bridge_rthash(sc, brt->brt_addr);
|
|
|
|
lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
|
|
if (lbrt == NULL) {
|
|
LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
|
|
goto out;
|
|
}
|
|
|
|
do {
|
|
dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN);
|
|
if (dir == 0)
|
|
return (EEXIST);
|
|
if (dir > 0) {
|
|
LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
|
|
goto out;
|
|
}
|
|
if (LIST_NEXT(lbrt, brt_hash) == NULL) {
|
|
LIST_INSERT_AFTER(lbrt, brt, brt_hash);
|
|
goto out;
|
|
}
|
|
lbrt = LIST_NEXT(lbrt, brt_hash);
|
|
} while (lbrt != NULL);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
panic("bridge_rtnode_insert: impossible");
|
|
#endif
|
|
|
|
out:
|
|
LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
|
|
sc->sc_brtcnt++;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* bridge_rtnode_destroy:
|
|
*
|
|
* Destroy a bridge rtnode.
|
|
*/
|
|
void
|
|
bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
|
|
{
|
|
|
|
LIST_REMOVE(brt, brt_hash);
|
|
|
|
LIST_REMOVE(brt, brt_list);
|
|
sc->sc_brtcnt--;
|
|
pool_put(&bridge_rtnode_pool, brt);
|
|
}
|
|
|
|
#ifdef BRIDGE_IPF
|
|
extern struct pfil_head inet_pfil_hook; /* XXX */
|
|
extern struct pfil_head inet6_pfil_hook; /* XXX */
|
|
|
|
/*
|
|
* Send bridge packets through IPF if they are one of the types IPF can deal
|
|
* with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without
|
|
* question.)
|
|
*/
|
|
static int bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir)
|
|
{
|
|
int snap, error;
|
|
struct ether_header *eh1, eh2;
|
|
struct llc llc;
|
|
u_int16_t ether_type;
|
|
|
|
snap = 0;
|
|
error = -1; /* Default error if not error == 0 */
|
|
eh1 = mtod(*mp, struct ether_header *);
|
|
ether_type = ntohs(eh1->ether_type);
|
|
|
|
/*
|
|
* Check for SNAP/LLC.
|
|
*/
|
|
if (ether_type < ETHERMTU) {
|
|
struct llc *llc = (struct llc *)(eh1 + 1);
|
|
|
|
if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
|
|
llc->llc_dsap == LLC_SNAP_LSAP &&
|
|
llc->llc_ssap == LLC_SNAP_LSAP &&
|
|
llc->llc_control == LLC_UI) {
|
|
ether_type = htons(llc->llc_un.type_snap.ether_type);
|
|
snap = 1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we're trying to filter bridge traffic, don't look at anything
|
|
* other than IP and ARP traffic. If the filter doesn't understand
|
|
* IPv6, don't allow IPv6 through the bridge either. This is lame
|
|
* since if we really wanted, say, an AppleTalk filter, we are hosed,
|
|
* but of course we don't have an AppleTalk filter to begin with.
|
|
* (Note that since IPF doesn't understand ARP it will pass *ALL*
|
|
* ARP traffic.)
|
|
*/
|
|
switch (ether_type) {
|
|
case ETHERTYPE_ARP:
|
|
case ETHERTYPE_REVARP:
|
|
return 0; /* Automatically pass */
|
|
case ETHERTYPE_IP:
|
|
# ifdef INET6
|
|
case ETHERTYPE_IPV6:
|
|
# endif /* INET6 */
|
|
break;
|
|
default:
|
|
goto bad;
|
|
}
|
|
|
|
/* Strip off the Ethernet header and keep a copy. */
|
|
m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
|
|
m_adj(*mp, ETHER_HDR_LEN);
|
|
|
|
/* Strip off snap header, if present */
|
|
if (snap) {
|
|
m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc);
|
|
m_adj(*mp, sizeof(struct llc));
|
|
}
|
|
|
|
/*
|
|
* Check basic packet sanity and run IPF through pfil.
|
|
*/
|
|
switch (ether_type)
|
|
{
|
|
case ETHERTYPE_IP :
|
|
error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0;
|
|
if (error == 0)
|
|
error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, dir);
|
|
break;
|
|
# ifdef INET6
|
|
case ETHERTYPE_IPV6 :
|
|
error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0;
|
|
if (error == 0)
|
|
error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, dir);
|
|
break;
|
|
# endif
|
|
default :
|
|
error = 0;
|
|
break;
|
|
}
|
|
|
|
if (*mp == NULL)
|
|
return error;
|
|
if (error != 0)
|
|
goto bad;
|
|
|
|
error = -1;
|
|
|
|
/*
|
|
* Finally, put everything back the way it was and return
|
|
*/
|
|
if (snap) {
|
|
M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT);
|
|
if (*mp == NULL)
|
|
return error;
|
|
bcopy(&llc, mtod(*mp, caddr_t), sizeof(struct llc));
|
|
}
|
|
|
|
M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
|
|
if (*mp == NULL)
|
|
return error;
|
|
bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
|
|
|
|
return 0;
|
|
|
|
bad:
|
|
m_freem(*mp);
|
|
*mp = NULL;
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Perform basic checks on header size since
|
|
* IPF assumes ip_input has already processed
|
|
* it for it. Cut-and-pasted from ip_input.c.
|
|
* Given how simple the IPv6 version is,
|
|
* does the IPv4 version really need to be
|
|
* this complicated?
|
|
*
|
|
* XXX Should we update ipstat here, or not?
|
|
* XXX Right now we update ipstat but not
|
|
* XXX csum_counter.
|
|
*/
|
|
static int
|
|
bridge_ip_checkbasic(struct mbuf **mp)
|
|
{
|
|
struct mbuf *m = *mp;
|
|
struct ip *ip;
|
|
int len, hlen;
|
|
|
|
if (*mp == NULL)
|
|
return -1;
|
|
|
|
if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
|
|
if ((m = m_copyup(m, sizeof(struct ip),
|
|
(max_linkhdr + 3) & ~3)) == NULL) {
|
|
/* XXXJRT new stat, please */
|
|
ipstat.ips_toosmall++;
|
|
goto bad;
|
|
}
|
|
} else if (__predict_false(m->m_len < sizeof (struct ip))) {
|
|
if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
|
|
ipstat.ips_toosmall++;
|
|
goto bad;
|
|
}
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
if (ip == NULL) goto bad;
|
|
|
|
if (ip->ip_v != IPVERSION) {
|
|
ipstat.ips_badvers++;
|
|
goto bad;
|
|
}
|
|
hlen = ip->ip_hl << 2;
|
|
if (hlen < sizeof(struct ip)) { /* minimum header length */
|
|
ipstat.ips_badhlen++;
|
|
goto bad;
|
|
}
|
|
if (hlen > m->m_len) {
|
|
if ((m = m_pullup(m, hlen)) == 0) {
|
|
ipstat.ips_badhlen++;
|
|
goto bad;
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
if (ip == NULL) goto bad;
|
|
}
|
|
|
|
switch (m->m_pkthdr.csum_flags &
|
|
((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
|
|
M_CSUM_IPv4_BAD)) {
|
|
case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
|
|
/* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */
|
|
goto bad;
|
|
|
|
case M_CSUM_IPv4:
|
|
/* Checksum was okay. */
|
|
/* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */
|
|
break;
|
|
|
|
default:
|
|
/* Must compute it ourselves. */
|
|
/* INET_CSUM_COUNTER_INCR(&ip_swcsum); */
|
|
if (in_cksum(m, hlen) != 0)
|
|
goto bad;
|
|
break;
|
|
}
|
|
|
|
/* Retrieve the packet length. */
|
|
len = ntohs(ip->ip_len);
|
|
|
|
/*
|
|
* Check for additional length bogosity
|
|
*/
|
|
if (len < hlen) {
|
|
ipstat.ips_badlen++;
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* Check that the amount of data in the buffers
|
|
* is as at least much as the IP header would have us expect.
|
|
* Drop packet if shorter than we expect.
|
|
*/
|
|
if (m->m_pkthdr.len < len) {
|
|
ipstat.ips_tooshort++;
|
|
goto bad;
|
|
}
|
|
|
|
/* Checks out, proceed */
|
|
*mp = m;
|
|
return 0;
|
|
|
|
bad:
|
|
*mp = m;
|
|
return -1;
|
|
}
|
|
|
|
# ifdef INET6
|
|
/*
|
|
* Same as above, but for IPv6.
|
|
* Cut-and-pasted from ip6_input.c.
|
|
* XXX Should we update ip6stat, or not?
|
|
*/
|
|
static int
|
|
bridge_ip6_checkbasic(struct mbuf **mp)
|
|
{
|
|
struct mbuf *m = *mp;
|
|
struct ip6_hdr *ip6;
|
|
|
|
/*
|
|
* If the IPv6 header is not aligned, slurp it up into a new
|
|
* mbuf with space for link headers, in the event we forward
|
|
* it. Otherwise, if it is aligned, make sure the entire base
|
|
* IPv6 header is in the first mbuf of the chain.
|
|
*/
|
|
if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
|
|
struct ifnet *inifp = m->m_pkthdr.rcvif;
|
|
if ((m = m_copyup(m, sizeof(struct ip6_hdr),
|
|
(max_linkhdr + 3) & ~3)) == NULL) {
|
|
/* XXXJRT new stat, please */
|
|
ip6stat.ip6s_toosmall++;
|
|
in6_ifstat_inc(inifp, ifs6_in_hdrerr);
|
|
goto bad;
|
|
}
|
|
} else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
|
|
struct ifnet *inifp = m->m_pkthdr.rcvif;
|
|
if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
|
|
ip6stat.ip6s_toosmall++;
|
|
in6_ifstat_inc(inifp, ifs6_in_hdrerr);
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
|
|
ip6stat.ip6s_badvers++;
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
|
|
goto bad;
|
|
}
|
|
|
|
/* Checks out, proceed */
|
|
*mp = m;
|
|
return 0;
|
|
|
|
bad:
|
|
*mp = m;
|
|
return -1;
|
|
}
|
|
# endif /* INET6 */
|
|
#endif /* BRIDGE_IPF */
|