c2cd01e480
In order of importance:
+ each cluster now uses private data structures (filtering and
local address tables) so you can treat them as fully independent
switches. This part of the work was supported by:
Cisco Systems, Inc. - NSITE lab, RTP, NC.
+ cleaned up the handling of configuration, so the system will behave
much better when real or pseudo devices are dynamically attached
or detached. It should also not panic anymore on systems with large
number of devices, closing a few existings PRs on the topic.
+ while at it, add support for VLAN. This means that a FreeBSD box
can now work as a real VLAN switch, with trunk interfaces etc.
As an example:
ifconfig vlan0 vlan 3 vlandev dc0
ifconfig vlan1 vlan 4 vlandev dc0
net.link.ether.bridge_cfg="vlan0:3,dc1:3,vlan1:4,dc1:4"
uses dc0 as a trunk interface, and dc1 and dc3 as ports on vlans 3 and 4
You get the idea...
NOTA BENE: by default bridge_cfg is initialised to "" so even if
you enable bridging, no packets will be bridged until you set the
list of interfaces on which you want this to happen.
+ large restructuring of the code, moving private vars and types from
bridge.h to bridge.c.
+ added a lot of comments to the code to explain how to use it.
115 lines
4.1 KiB
C
115 lines
4.1 KiB
C
/*
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* Copyright (c) 1998-2002 Luigi Rizzo
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*
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* Work partly supported by: Cisco Systems, Inc. - NSITE lab, RTP, NC
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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extern int do_bridge;
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/*
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* We need additional per-interface info for the bridge, which is
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* stored in a struct bdg_softc. The ifp2sc[] array provides a pointer
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* to this struct using the if_index as a mapping key.
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* bdg_softc has a backpointer to the struct ifnet, the bridge
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* flags, and a cluster (bridging occurs only between port of the
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* same cluster).
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*/
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struct cluster_softc; /* opaque here, defined in bridge.c */
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struct bdg_softc {
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struct ifnet *ifp ;
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/* also ((struct arpcom *)ifp)->ac_enaddr is the eth. addr */
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int flags ;
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#define IFF_BDG_PROMISC 0x0001 /* set promisc mode on this if. */
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#define IFF_MUTE 0x0002 /* mute this if for bridging. */
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#define IFF_USED 0x0004 /* use this if for bridging. */
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struct cluster_softc *cluster;
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} ;
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extern struct bdg_softc *ifp2sc;
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#define BDG_USED(ifp) (ifp2sc[ifp->if_index].flags & IFF_USED)
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/*
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* BDG_ACTIVE(ifp) does all checks to see if bridging is enabled, loaded,
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* and used on a given interface.
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*/
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#define BDG_ACTIVE(ifp) (do_bridge && BDG_LOADED && BDG_USED(ifp))
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/*
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* The following constants are not legal ifnet pointers, and are used
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* as return values from the classifier, bridge_dst_lookup().
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* The same values are used as index in the statistics arrays,
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* with BDG_FORWARD replacing specifically forwarded packets.
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*
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* These constants are here because they are used in 'netstat'
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* to show bridge statistics.
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*/
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#define BDG_BCAST ( (struct ifnet *)1 )
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#define BDG_MCAST ( (struct ifnet *)2 )
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#define BDG_LOCAL ( (struct ifnet *)3 )
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#define BDG_DROP ( (struct ifnet *)4 )
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#define BDG_UNKNOWN ( (struct ifnet *)5 )
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#define BDG_IN ( (struct ifnet *)7 )
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#define BDG_OUT ( (struct ifnet *)8 )
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#define BDG_FORWARD ( (struct ifnet *)9 )
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/*
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* Statistics are passed up with the sysctl interface, "netstat -p bdg"
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* reads them. PF_BDG defines the 'bridge' protocol family.
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*/
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#define PF_BDG 3 /* XXX superhack */
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#define STAT_MAX (int)BDG_FORWARD
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struct bdg_port_stat {
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char name[16];
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u_long collisions;
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u_long p_in[STAT_MAX+1];
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} ;
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/* XXX this should be made dynamic */
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#define BDG_MAX_PORTS 128
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struct bdg_stats {
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struct bdg_port_stat s[BDG_MAX_PORTS];
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} ;
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#define BDG_STAT(ifp, type) bdg_stats.s[ifp->if_index].p_in[(uintptr_t)type]++
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#ifdef _KERNEL
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typedef struct ifnet *bridge_in_t(struct ifnet *, struct ether_header *);
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/* bdg_forward frees the mbuf if necessary, returning null */
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typedef struct mbuf *bdg_forward_t(struct mbuf *, struct ether_header *const,
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struct ifnet *);
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typedef void bdgtakeifaces_t(void);
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extern bridge_in_t *bridge_in_ptr;
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extern bdg_forward_t *bdg_forward_ptr;
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extern bdgtakeifaces_t *bdgtakeifaces_ptr;
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#define BDG_LOADED (bdgtakeifaces_ptr != NULL)
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#endif /* KERNEL */
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