2085d1a050
routines. The descriptor contains parameters which could be used within those routines (eg. ip_output() ). On passing, add IPPROTO_PGM entry to netinet/in.h
652 lines
19 KiB
C
652 lines
19 KiB
C
/*
|
|
* Copyright (c) 1998 Luigi Rizzo
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* This code implements bridging in FreeBSD. It only acts on ethernet
|
|
* type of interfaces (others are still usable for routing).
|
|
* A bridging table holds the source MAC address/dest. interface for each
|
|
* known node. The table is indexed using an hash of the source address.
|
|
*
|
|
* Input packets are tapped near the end of the input routine in each
|
|
* driver (near the call to bpf_mtap, or before the call to ether_input)
|
|
* and analysed calling bridge_in(). Depending on the result, the packet
|
|
* can be forwarded to one or more output interfaces using bdg_forward(),
|
|
* and/or sent to the upper layer (e.g. in case of multicast).
|
|
*
|
|
* Output packets are intercepted near the end of ether_output(),
|
|
* the correct destination is selected calling bdg_dst_lookup(),
|
|
* and then forwarding is done using bdg_forward().
|
|
* Bridging is controlled by the sysctl variable net.link.ether.bridge
|
|
*
|
|
* The arp code is also modified to let a machine answer to requests
|
|
* irrespective of the port the request came from.
|
|
*
|
|
* In case of loops in the bridging topology, the bridge detects this
|
|
* event and temporarily mutes output bridging on one of the ports.
|
|
* Periodically, interfaces are unmuted by bdg_timeout(). (For the
|
|
* mute flag i am temporarily using IFF_LINK2 but this has to
|
|
* change.) Muting is only implemented as a safety measure, and also as
|
|
* a mechanism to support a user-space implementation of the spanning
|
|
* tree algorithm. In the final release, unmuting will only occur
|
|
* because of explicit action of the user-level daemon.
|
|
*
|
|
* To build a bridging kernel, use the following option
|
|
* option BRIDGE
|
|
* and then at runtime set the sysctl variable to enable bridging.
|
|
*
|
|
* Only one interface is supposed to have addresses set (but
|
|
* there are no problems in practice if you set addresses for more
|
|
* than one interface).
|
|
* Bridging will act before routing, but nothing prevents a machine
|
|
* from doing both (modulo bugs in the implementation...).
|
|
*
|
|
* THINGS TO REMEMBER
|
|
* - bridging requires some (small) modifications to the interface
|
|
* driver. Currently (980911) the "ed", "de", "tx", "lnc" drivers
|
|
* have been modified and tested. "fxp", "ep", "fe" have been
|
|
* modified but not tested. See the "ed" and "de" drivers as
|
|
* examples on how to operate.
|
|
* - bridging is incompatible with multicast routing on the same
|
|
* machine. There is not an easy fix to this.
|
|
* - loop detection is still not very robust.
|
|
* - the interface of bdg_forward() could be improved.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/socket.h> /* for net/if.h */
|
|
#include <sys/kernel.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_types.h>
|
|
|
|
#include <netinet/in.h> /* for struct arpcom */
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/in_var.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/if_ether.h> /* for struct arpcom */
|
|
|
|
#include "opt_ipfw.h"
|
|
#include "opt_ipdn.h"
|
|
|
|
#if defined(IPFIREWALL)
|
|
#include <net/route.h>
|
|
#include <netinet/ip_fw.h>
|
|
#if defined(DUMMYNET)
|
|
#include <netinet/ip_dummynet.h>
|
|
#endif
|
|
#endif
|
|
|
|
#include <net/bridge.h>
|
|
|
|
/*
|
|
* For debugging, you can use the following macros.
|
|
* remember, rdtsc() only works on Pentium-class machines
|
|
|
|
quad_t ticks;
|
|
DDB(ticks = rdtsc();)
|
|
... interesting code ...
|
|
DDB(bdg_fw_ticks += (u_long)(rdtsc() - ticks) ; bdg_fw_count++ ;)
|
|
|
|
*
|
|
*/
|
|
|
|
#define DDB(x) x
|
|
#define DEB(x)
|
|
|
|
/*
|
|
* System initialization
|
|
*/
|
|
|
|
static void bdginit(void *);
|
|
static void flush_table(void);
|
|
|
|
SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_SECOND, bdginit, NULL)
|
|
|
|
static int bdg_ipfw = 0 ;
|
|
int do_bridge = 0;
|
|
bdg_hash_table *bdg_table = NULL ;
|
|
|
|
/*
|
|
* we need additional info for the bridge. The bdg_ifp2sc[] array
|
|
* provides a pointer to this struct using the if_index.
|
|
* bdg_softc has a backpointer to the struct ifnet, the bridge
|
|
* flags, and a group (bridging occurs only between port of the
|
|
* same group).
|
|
*/
|
|
struct bdg_softc {
|
|
struct ifnet *ifp ;
|
|
/* ((struct arpcom *)ifp)->ac_enaddr is the eth. addr */
|
|
int flags ;
|
|
int group ;
|
|
} ;
|
|
|
|
static struct bdg_softc **ifp2sc = NULL ;
|
|
|
|
#if 0 /* new code using ifp2sc */
|
|
#define SAMEGROUP(ifp,src) (src == NULL || \
|
|
ifp2sc[ifp->if_index]->group == ifp2sc[src->if_index]->group )
|
|
#define MUTED(ifp) (ifp2sc[ifp->if_index]->flags & IFF_MUTE)
|
|
#define MUTE(ifp) ifp2sc[ifp->if_index]->flags |= IFF_MUTE
|
|
#define UNMUTE(ifp) ifp2sc[ifp->if_index]->flags &= ~IFF_MUTE
|
|
#else
|
|
#define SAMEGROUP(a,b) 1
|
|
#define MUTED(ifp) (ifp->if_flags & IFF_MUTE)
|
|
#define MUTE(ifp) ifp->if_flags |= IFF_MUTE
|
|
#define UNMUTE(ifp) ifp->if_flags &= ~IFF_MUTE
|
|
#endif
|
|
|
|
static int
|
|
sysctl_bdg SYSCTL_HANDLER_ARGS
|
|
{
|
|
int error, oldval = do_bridge ;
|
|
|
|
error = sysctl_handle_int(oidp,
|
|
oidp->oid_arg1, oidp->oid_arg2, req);
|
|
printf("called sysctl for bridge name %s arg2 %d val %d->%d\n",
|
|
oidp->oid_name, oidp->oid_arg2,
|
|
oldval, do_bridge);
|
|
if (bdg_table == NULL)
|
|
do_bridge = 0 ;
|
|
if (oldval != do_bridge) {
|
|
flush_table();
|
|
}
|
|
return error ;
|
|
}
|
|
|
|
SYSCTL_DECL(_net_link_ether);
|
|
SYSCTL_PROC(_net_link_ether, OID_AUTO, bridge, CTLTYPE_INT|CTLFLAG_RW,
|
|
&do_bridge, 0, &sysctl_bdg, "I", "Bridging");
|
|
|
|
SYSCTL_INT(_net_link_ether, OID_AUTO, bridge_ipfw, CTLFLAG_RW, &bdg_ipfw,0,"");
|
|
#if 1 /* diagnostic vars */
|
|
int bdg_in_count = 0 , bdg_in_ticks = 0 , bdg_fw_count = 0, bdg_fw_ticks = 0 ;
|
|
SYSCTL_INT(_net_link_ether, OID_AUTO, bdginc, CTLFLAG_RW, &bdg_in_count,0,"");
|
|
SYSCTL_INT(_net_link_ether, OID_AUTO, bdgint, CTLFLAG_RW, &bdg_in_ticks,0,"");
|
|
SYSCTL_INT(_net_link_ether, OID_AUTO, bdgfwc, CTLFLAG_RW, &bdg_fw_count,0,"");
|
|
SYSCTL_INT(_net_link_ether, OID_AUTO, bdgfwt, CTLFLAG_RW, &bdg_fw_ticks,0,"");
|
|
#endif
|
|
static struct bdg_stats bdg_stats ;
|
|
SYSCTL_STRUCT(_net_link_ether, PF_BDG, bdgstats,
|
|
CTLFLAG_RD, &bdg_stats , bdg_stats, "bridge statistics");
|
|
|
|
static int bdg_loops ;
|
|
|
|
/*
|
|
* completely flush the bridge table.
|
|
*/
|
|
static void
|
|
flush_table()
|
|
{
|
|
int s,i;
|
|
|
|
if (bdg_table == NULL)
|
|
return ;
|
|
s = splimp();
|
|
for (i=0; i< HASH_SIZE; i++)
|
|
bdg_table[i].name= NULL; /* clear table */
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* called periodically to flush entries etc.
|
|
*/
|
|
static void
|
|
bdg_timeout(void *dummy)
|
|
{
|
|
struct ifnet *ifp ;
|
|
int s ;
|
|
static int slowtimer = 0 ;
|
|
|
|
if (do_bridge) {
|
|
static int age_index = 0 ; /* index of table position to age */
|
|
int l = age_index + HASH_SIZE/4 ;
|
|
/*
|
|
* age entries in the forwarding table.
|
|
*/
|
|
if (l > HASH_SIZE)
|
|
l = HASH_SIZE ;
|
|
for (; age_index < l ; age_index++)
|
|
if (bdg_table[age_index].used)
|
|
bdg_table[age_index].used = 0 ;
|
|
else if (bdg_table[age_index].name) {
|
|
/* printf("xx flushing stale entry %d\n", age_index); */
|
|
bdg_table[age_index].name = NULL ;
|
|
}
|
|
if (age_index >= HASH_SIZE)
|
|
age_index = 0 ;
|
|
|
|
if (--slowtimer <= 0 ) {
|
|
slowtimer = 5 ;
|
|
|
|
for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next) {
|
|
if (ifp->if_type != IFT_ETHER)
|
|
continue ;
|
|
if ( 0 == ( ifp->if_flags & IFF_UP) ) {
|
|
s = splimp();
|
|
if_up(ifp);
|
|
splx(s);
|
|
}
|
|
if ( 0 == ( ifp->if_flags & IFF_PROMISC) ) {
|
|
int ret ;
|
|
s = splimp();
|
|
ret = ifpromisc(ifp, 1);
|
|
splx(s);
|
|
printf(">> now %s%d flags 0x%x promisc %d\n",
|
|
ifp->if_name, ifp->if_unit,
|
|
ifp->if_flags, ret);
|
|
}
|
|
if (MUTED(ifp)) {
|
|
printf(">> unmuting %s%d\n", ifp->if_name, ifp->if_unit);
|
|
UNMUTE(ifp) ;
|
|
}
|
|
}
|
|
bdg_loops = 0 ;
|
|
}
|
|
}
|
|
timeout(bdg_timeout, (void *)0, 2*hz );
|
|
}
|
|
|
|
/*
|
|
* local MAC addresses are held in a small array. This makes comparisons
|
|
* much faster.
|
|
*/
|
|
unsigned char bdg_addresses[6*BDG_MAX_PORTS];
|
|
int bdg_ports ;
|
|
|
|
/*
|
|
* initialization of bridge code.
|
|
*
|
|
* This will have to change to support kldload.
|
|
*/
|
|
static void
|
|
bdginit(dummy)
|
|
void *dummy;
|
|
{
|
|
int i, s;
|
|
struct ifnet *ifp;
|
|
struct arpcom *ac ;
|
|
u_char *eth_addr ;
|
|
|
|
/*
|
|
* initialization of bridge code
|
|
*/
|
|
s = splimp(); /* XXX does this matter? */
|
|
if (bdg_table == NULL)
|
|
bdg_table = (struct hash_table *)
|
|
malloc(HASH_SIZE * sizeof(struct hash_table),
|
|
M_IFADDR, M_WAITOK);
|
|
flush_table();
|
|
|
|
ifp2sc = malloc(if_index * sizeof(struct bdg_softc *), M_IFADDR, M_WAITOK );
|
|
bzero(ifp2sc, if_index * sizeof(struct bdg_softc *) );
|
|
|
|
bzero(&bdg_stats, sizeof(bdg_stats) );
|
|
bdg_ports = 0 ;
|
|
eth_addr = bdg_addresses ;
|
|
|
|
printf("BRIDGE 981214, have %d interfaces\n", if_index);
|
|
for (i = 0 , ifp = ifnet.tqh_first ; i < if_index ;
|
|
i++, ifp = ifp->if_link.tqe_next)
|
|
if (ifp->if_type == IFT_ETHER) { /* ethernet ? */
|
|
ac = (struct arpcom *)ifp;
|
|
sprintf(bdg_stats.s[ifp->if_index].name,
|
|
"%s%d", ifp->if_name, ifp->if_unit);
|
|
printf("-- index %d %s type %d phy %d addrl %d addr %6D\n",
|
|
ifp->if_index,
|
|
bdg_stats.s[ifp->if_index].name,
|
|
(int)ifp->if_type, (int) ifp->if_physical,
|
|
(int)ifp->if_addrlen,
|
|
ac->ac_enaddr, "." );
|
|
bcopy(ac->ac_enaddr, eth_addr, 6);
|
|
eth_addr += 6 ;
|
|
|
|
ifp2sc[bdg_ports] = malloc(sizeof(struct bdg_softc),
|
|
M_IFADDR, M_WAITOK );
|
|
ifp2sc[bdg_ports]->ifp = ifp ;
|
|
ifp2sc[bdg_ports]->flags = 0 ;
|
|
ifp2sc[bdg_ports]->group = 0 ;
|
|
bdg_ports ++ ;
|
|
}
|
|
bdg_timeout(0);
|
|
do_bridge=0;
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* bridge_in() is invoked to perform bridging decision on input packets.
|
|
* On Input:
|
|
* m packet to be bridged. The mbuf need not to hold the
|
|
* whole packet, only the first 14 bytes suffice. We
|
|
* assume them to be contiguous. No alignment assumptions
|
|
* because they are not a problem on i386 class machines.
|
|
*
|
|
* On Return: destination of packet, one of
|
|
* BDG_BCAST broadcast
|
|
* BDG_MCAST multicast
|
|
* BDG_LOCAL is only for a local address (do not forward)
|
|
* BDG_DROP drop the packet
|
|
* ifp ifp of the destination interface.
|
|
*
|
|
* Forwarding is not done directly to give a chance to some drivers
|
|
* to fetch more of the packet, or simply drop it completely.
|
|
*/
|
|
|
|
|
|
struct ifnet *
|
|
bridge_in(struct mbuf *m)
|
|
{
|
|
int index;
|
|
struct ifnet *ifp = m->m_pkthdr.rcvif, *dst , *old ;
|
|
int dropit = MUTED(ifp) ;
|
|
struct ether_header *eh;
|
|
|
|
eh = mtod(m, struct ether_header *);
|
|
|
|
/*
|
|
* hash the source address
|
|
*/
|
|
index= HASH_FN(eh->ether_shost);
|
|
bdg_table[index].used = 1 ;
|
|
old = bdg_table[index].name ;
|
|
if ( old ) { /* the entry is valid. */
|
|
if (!BDG_MATCH( eh->ether_shost, bdg_table[index].etheraddr) ) {
|
|
printf("collision at %d\n", index);
|
|
bdg_table[index].name = NULL ;
|
|
} else if (old != ifp) {
|
|
/*
|
|
* found a loop. Either a machine has moved, or there
|
|
* is a misconfiguration/reconfiguration of the network.
|
|
* First, do not forward this packet!
|
|
* Record the relocation anyways; then, if loops persist,
|
|
* suspect a reconfiguration and disable forwarding
|
|
* from the old interface.
|
|
*/
|
|
bdg_table[index].name = ifp ; /* relocate address */
|
|
printf("-- loop (%d) %6D to %s%d from %s%d (%s)\n",
|
|
bdg_loops, eh->ether_shost, ".",
|
|
ifp->if_name, ifp->if_unit,
|
|
old->if_name, old->if_unit,
|
|
old->if_flags & IFF_MUTE ? "muted":"ignore");
|
|
dropit = 1 ;
|
|
if ( !MUTED(old) ) {
|
|
if (++bdg_loops > 10)
|
|
MUTE(old) ;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* now write the source address into the table
|
|
*/
|
|
if (bdg_table[index].name == NULL) {
|
|
DEB(printf("new addr %6D at %d for %s%d\n",
|
|
eh->ether_shost, ".", index, ifp->if_name, ifp->if_unit);)
|
|
bcopy(eh->ether_shost, bdg_table[index].etheraddr, 6);
|
|
bdg_table[index].name = ifp ;
|
|
}
|
|
dst = bridge_dst_lookup(m);
|
|
/* Return values:
|
|
* BDG_BCAST, BDG_MCAST, BDG_LOCAL, BDG_UNKNOWN, BDG_DROP, ifp.
|
|
* For muted interfaces, the first 3 are changed in BDG_LOCAL,
|
|
* and others to BDG_DROP. Also, for incoming packets, ifp is changed
|
|
* to BDG_DROP in case ifp == src . These mods are not necessary
|
|
* for outgoing packets from ether_output().
|
|
*/
|
|
BDG_STAT(ifp, BDG_IN);
|
|
switch ((int)dst) {
|
|
case (int)BDG_BCAST:
|
|
case (int)BDG_MCAST:
|
|
case (int)BDG_LOCAL:
|
|
case (int)BDG_UNKNOWN:
|
|
case (int)BDG_DROP:
|
|
BDG_STAT(ifp, dst);
|
|
break ;
|
|
default :
|
|
if (dst == ifp || dropit )
|
|
BDG_STAT(ifp, BDG_DROP);
|
|
else
|
|
BDG_STAT(ifp, BDG_FORWARD);
|
|
break ;
|
|
}
|
|
|
|
if ( dropit ) {
|
|
if (dst == BDG_BCAST || dst == BDG_MCAST || dst == BDG_LOCAL)
|
|
return BDG_LOCAL ;
|
|
else
|
|
return BDG_DROP ;
|
|
} else {
|
|
return (dst == ifp ? BDG_DROP : dst ) ;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Forward to dst, excluding src port and (if not a single interface)
|
|
* muted interfaces. The packet is freed if marked as such
|
|
* and not for a local destination.
|
|
* A cleaner implementation would be to make bdg_forward()
|
|
* always consume the packet, leaving to the caller the task
|
|
* to make a copy if it needs it. As it is now, bdg_forward()
|
|
* can keep a copy alive in some cases.
|
|
*/
|
|
int
|
|
bdg_forward (struct mbuf **m0, struct ifnet *dst)
|
|
{
|
|
struct ifnet *src = (*m0)->m_pkthdr.rcvif; /* could be NULL in output */
|
|
struct ifnet *ifp ;
|
|
struct ip *ip;
|
|
int error=0, s ;
|
|
int once = 0; /* execute the loop only once */
|
|
int canfree = 1 ; /* can free the buf at the end */
|
|
struct mbuf *m ;
|
|
|
|
struct ether_header *eh = mtod(*m0, struct ether_header *); /* XXX */
|
|
|
|
if (dst == BDG_DROP) { /* this should not happen */
|
|
printf("xx bdg_forward for BDG_DROP)\n");
|
|
m_freem(*m0) ;
|
|
*m0 = NULL ;
|
|
return 0;
|
|
}
|
|
if (dst == BDG_LOCAL) { /* this should not happen as well */
|
|
printf("xx ouch, bdg_forward for local pkt\n");
|
|
return 0;
|
|
}
|
|
if (dst == BDG_BCAST || dst == BDG_MCAST || dst == BDG_UNKNOWN) {
|
|
ifp = ifnet.tqh_first ;
|
|
once = 0 ;
|
|
if (dst != BDG_UNKNOWN)
|
|
canfree = 0 ;
|
|
} else {
|
|
ifp = dst ;
|
|
once = 1 ; /* and also canfree */
|
|
}
|
|
#ifdef IPFIREWALL
|
|
/*
|
|
* do filtering in a very similar way to what is done
|
|
* in ip_output. Only for IP packets, and only pass/fail/dummynet
|
|
* is supported. The tricky thing is to make sure that enough of
|
|
* the packet (basically, Eth+IP+TCP/UDP headers) is contiguous
|
|
* so that calls to m_pullup in ip_fw_chk will not kill the
|
|
* ethernet header.
|
|
*/
|
|
if (ip_fw_chk_ptr) {
|
|
u_int16_t dummy ;
|
|
struct ip_fw_chain *rule;
|
|
int off;
|
|
|
|
m = *m0 ;
|
|
if (m->m_type == MT_DUMMYNET) {
|
|
/*
|
|
* the packet was already tagged, so part of the
|
|
* processing was already done, and we need to go down.
|
|
*/
|
|
rule = (struct ip_fw_chain *)(m->m_data) ;
|
|
(*m0) = m = m->m_next ;
|
|
|
|
src = m->m_pkthdr.rcvif; /* could be NULL in output */
|
|
eh = mtod(m, struct ether_header *); /* XXX */
|
|
canfree = 1 ; /* for sure, a copy is not needed later. */
|
|
goto forward; /* HACK! */
|
|
} else
|
|
rule = NULL ;
|
|
if (bdg_ipfw == 0)
|
|
goto forward ;
|
|
if (src == NULL)
|
|
goto forward ; /* do not apply to packets from ether_output */
|
|
if (canfree == 0 ) /* need to make a copy */
|
|
m = m_copypacket(*m0, M_DONTWAIT);
|
|
if (m == NULL) {
|
|
/* fail... */
|
|
return 0 ;
|
|
}
|
|
|
|
dummy = 0 ;
|
|
/*
|
|
* before calling the firewall, swap fields the same as IP does.
|
|
* here we assume the pkt is an IP one and the header is contiguous
|
|
*/
|
|
eh = mtod(m, struct ether_header *);
|
|
ip = (struct ip *)(eh + 1 ) ;
|
|
NTOHS(ip->ip_len);
|
|
NTOHS(ip->ip_id);
|
|
NTOHS(ip->ip_off);
|
|
|
|
/*
|
|
* The third parameter to the firewall code is the dst. interface.
|
|
* Since we apply checks only on input pkts we use NULL.
|
|
*/
|
|
off = (*ip_fw_chk_ptr)(NULL, 0, NULL, &dummy, &m, &rule, NULL) ;
|
|
if (m == NULL) { /* pkt discarded by firewall */
|
|
if (canfree)
|
|
*m0 = NULL ;
|
|
return 0 ;
|
|
}
|
|
/*
|
|
* on return, the mbuf pointer might have changed. Restore
|
|
* *m0 (if it was the same as m), eh, ip and then
|
|
* restore original ordering.
|
|
*/
|
|
eh = mtod(m, struct ether_header *);
|
|
ip = (struct ip *)(eh + 1 ) ;
|
|
if (canfree) /* m was a reference to *m0, so update *m0 */
|
|
*m0 = m ;
|
|
HTONS(ip->ip_len);
|
|
HTONS(ip->ip_id);
|
|
HTONS(ip->ip_off);
|
|
if (off == 0) {
|
|
if (canfree == 0)
|
|
m_freem(m);
|
|
goto forward ;
|
|
}
|
|
#ifdef DUMMYNET
|
|
if (off & 0x10000) {
|
|
/*
|
|
* pass the pkt to dummynet. Need to include m, dst, rule.
|
|
* Dummynet consumes the packet in all cases.
|
|
*/
|
|
dummynet_io((off & 0xffff), DN_TO_BDG_FWD, m, dst, NULL, 0, rule);
|
|
if (canfree) /* dummynet has consumed the original one */
|
|
*m0 = NULL ;
|
|
return 0 ;
|
|
}
|
|
#endif
|
|
/* if none of the above matches, we have to drop the pkt */
|
|
if (m)
|
|
m_freem(m);
|
|
if (canfree && m != *m0) {
|
|
m_freem(*m0);
|
|
*m0 = NULL ;
|
|
}
|
|
return 0 ;
|
|
}
|
|
forward:
|
|
#endif /* IPFIREWALL */
|
|
if (canfree && once)
|
|
m = *m0 ;
|
|
else
|
|
m = NULL ;
|
|
|
|
for ( ; ifp ; ifp = ifp->if_link.tqe_next ) {
|
|
if (ifp != src && ifp->if_type == IFT_ETHER &&
|
|
(ifp->if_flags & (IFF_UP|IFF_RUNNING)) == (IFF_UP|IFF_RUNNING) &&
|
|
SAMEGROUP(ifp, src) && !MUTED(ifp) ) {
|
|
if (m == NULL) { /* do i need to make a copy ? */
|
|
if (canfree && ifp->if_link.tqe_next == NULL) /* last one! */
|
|
m = *m0 ;
|
|
else /* on a P5-90, m_packetcopy takes 540 ticks */
|
|
m = m_copypacket(*m0, M_DONTWAIT);
|
|
if (m == NULL) {
|
|
printf("bdg_forward: sorry, m_copy failed!\n");
|
|
return ENOBUFS ;
|
|
}
|
|
}
|
|
/*
|
|
* execute last part of ether_output.
|
|
*/
|
|
s = splimp();
|
|
/*
|
|
* Queue message on interface, and start output if interface
|
|
* not yet active.
|
|
*/
|
|
if (IF_QFULL(&ifp->if_snd)) {
|
|
IF_DROP(&ifp->if_snd);
|
|
MUTE(ifp); /* good measure... */
|
|
splx(s);
|
|
error = ENOBUFS ;
|
|
} else {
|
|
ifp->if_obytes += m->m_pkthdr.len ;
|
|
if (m->m_flags & M_MCAST)
|
|
ifp->if_omcasts++;
|
|
IF_ENQUEUE(&ifp->if_snd, m);
|
|
if ((ifp->if_flags & IFF_OACTIVE) == 0)
|
|
(*ifp->if_start)(ifp);
|
|
splx(s);
|
|
if (m == *m0)
|
|
*m0 = NULL ; /* the packet is gone... */
|
|
m = NULL ;
|
|
}
|
|
BDG_STAT(ifp, BDG_OUT);
|
|
}
|
|
if (once)
|
|
break ;
|
|
}
|
|
|
|
/* cleanup any mbuf leftover. */
|
|
if (m)
|
|
m_freem(m);
|
|
if (m == *m0)
|
|
*m0 = NULL ;
|
|
if (canfree && *m0) {
|
|
m_freem(*m0);
|
|
*m0 = NULL ;
|
|
}
|
|
return error ;
|
|
}
|