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ipkdb_if.c
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ipkdb_if.c
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/*
* Copyright (C) 1993-1996 Wolfgang Solfrank.
* Copyright (C) 1993-1996 TooLs GmbH.
* All rights reserved.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
*/
#include "ether.h"
#include "bpfilter.h"
#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/device.h>
#include <net/if.h>
#include <net/if_ether.h>
#include <netinet/in.h>
#include <netinet/if_inarp.h>
#include <ipkdb/ipkdb.h>
#include <machine/ipkdb.h>
int ipkdb_probe __P((struct device *, void *, void *));
void ipkdb_attach __P((struct device *, struct device *, void *));
static void ipkdbrcpy __P((struct ipkdb_if * , void *, void *, int));
static void ipkdbwcpy __P((struct ipkdb_if * , void *, void *, int));
static int ipkdbread __P((struct ipkdb_if *));
struct cfdriver ipkdbif_cd = {
NULL, "ipkdb", DV_DULL
};
/* For the config system the device doesn't exist */
int
ipkdb_probe(parent, match, aux)
struct device *parent;
void *match, *aux;
{
return 0;
}
void
ipkdb_attach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
panic("ipkdb_attach");
}
static void
ipkdbrcpy(kip, vsp, vdp, l)
struct ipkdb_if *kip;
void *vsp;
void *vdp;
int l;
{
int l1;
char *sp = vsp, *dp = vdp;
/* bounce source pointer */
while (sp >= kip->gotbuf + sizeof kip->gotbuf)
sp -= sizeof kip->gotbuf;
l1 = kip->gotbuf + sizeof kip->gotbuf - sp;
if (l >= l1) {
ipkdbcopy(sp, dp, l1);
l -= l1;
dp += l1;
sp = kip->gotbuf;
}
if (l)
ipkdbcopy(sp, dp, l);
}
static void
ipkdbwcpy(kip, vsp, vdp, l)
struct ipkdb_if *kip;
void *vsp;
void *vdp;
int l;
{
int l1;
char *sp = vsp, *dp = vdp;
/* bounce destination pointer */
while (dp >= kip->gotbuf + sizeof kip->gotbuf)
dp -= sizeof kip->gotbuf;
l1 = kip->gotbuf + sizeof kip->gotbuf - dp;
if (l >= l1) {
ipkdbcopy(sp, dp, l1);
l -= l1;
sp += l1;
dp = kip->gotbuf;
}
if (l)
ipkdbcopy(sp, dp, l);
}
static int
ipkdbread(kip)
struct ipkdb_if *kip;
{
struct ifnet *ifp = &kip->arp->ec_if;
struct ether_header *eh;
struct mbuf *m, **mp, *head = 0;
int l, len;
char *buf = kip->got;
ipkdbrcpy(kip, buf, &len, sizeof(int));
buf += sizeof(int);
kip->got += len + sizeof(int);
if (kip->got >= kip->gotbuf + sizeof kip->gotbuf)
kip->got -= sizeof kip->gotbuf;
if ((kip->gotlen -= len + sizeof(int)) < 0)
goto bad;
/* Allocate a header mbuf */
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == 0)
goto bad;
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = len;
l = MHLEN;
mp = &head;
/*
* Pull packet out of buf.
*/
while (len > 0) {
if (head) {
MGET(m, M_DONTWAIT, MT_DATA);
if (m == 0)
goto bad;
l = MLEN;
}
if (len >= MINCLSIZE) {
MCLGET(m, M_DONTWAIT);
if (m->m_flags & M_EXT)
l = MCLBYTES;
}
m->m_len = l = min(len, l);
ipkdbrcpy(kip, buf, mtod(m, caddr_t), l);
buf += l;
len -= l;
*mp = m;
mp = &m->m_next;
}
ifp->if_ipackets++;
eh = mtod(head, struct ether_header *);
#if NBPFILTER > 0
/*
* Check if there's a bp filter listening on this interface.
* If so, hand off the raw packet to bpf.
*/
if (kip->arp->ec_if.if_bpf)
bpf_mtap(kip->arp->ec_if.if_bpf, head);
/*
* Note that the interface cannot be in promiscuous mode if
* there are no bpf listeners. And if we are in promiscuous
* mode, we have to check if this packet is really ours.
*/
if ((ifp->if_flags&IFF_PROMISC)
&& ipkdbcmp(eh->ether_dhost,
kip->arp->ac_enaddr,
sizeof eh->ether_dhost)
!= 0
&& !(eh->ether_dhost[0] & 1)) { /* !mcast && !bcast */
m_freem(head);
return 0;
}
#endif
/*
* Fix up data start offset in mbuf to point past ether header
*/
m_adj(head, sizeof(struct ether_header));
ether_input(ifp, eh, head);
return 1;
bad:
ifp->if_ierrors++;
if (head)
m_freem(head);
/* flush buffer */
kip->got = kip->gotbuf;
kip->gotlen = 0;
return -1;
}
/*
* How to handle packets arriving during debugging:
* 0 - drop 'em immediately
* 1 - deliver 'em just as they would without debugging
*/
#ifdef __notyet__ /* results in mp_map overflows XXX */
char ipkdbget = 1;
#else
char ipkdbget = 0;
#endif
/*
* Interface driver interrupt handler calls here
* to get packets buffered by IPKDB.
*/
void
ipkdbrint(kip, ifp)
struct ipkdb_if *kip;
struct ifnet *ifp;
{
if (kip && kip->arp && ifp == &kip->arp->ec_if)
while (kip->gotlen > 0)
ipkdbread(kip);
}
/*
* IPKDB hands out a packet that it doesn't want
*/
void
ipkdbgotpkt(kip, cp, len)
struct ipkdb_if *kip;
char *cp;
int len;
{
char *buf;
if (!kip->arp || !ipkdbget)
return;
if (kip->gotlen + sizeof(int) + len > sizeof kip->gotbuf)
return;
buf = kip->got + kip->gotlen;
ipkdbwcpy(kip, &len, buf, sizeof(int));
buf += sizeof(int);
ipkdbwcpy(kip, cp, buf, len);
kip->gotlen += sizeof(int) + roundup(len, sizeof(int));
}
/*
* IPKDB wants to know the IP address of its interface
*/
void
ipkdbinet(kip)
struct ipkdb_if *kip;
{
struct ifaddr *ap;
if (kip->arp) {
for (ap = kip->arp->ec_if.if_addrlist.tqh_first; ap; ap = ap->ifa_list.tqe_next) {
if (ap->ifa_addr->sa_family == AF_INET) {
ipkdbcopy(&((struct sockaddr_in *)ap->ifa_addr)->sin_addr,
kip->myinetaddr, sizeof kip->myinetaddr);
kip->flags |= IPKDB_MYIP;
return;
}
}
}
}
/*
* Initialize IPKDB Interface handling
*/
int
ipkdbifinit(kip, unit)
struct ipkdb_if *kip;
int unit;
{
struct cfdata *cfp, *pcfp;
extern struct cfdata cfdata[];
short *pp;
u_char *cp;
/* flush buffer */
kip->got = kip->gotbuf;
/* defaults: */
kip->mtu = ETHERMTU;
for (cp = kip->hisenetaddr; cp < kip->hisenetaddr + sizeof kip->hisenetaddr;)
*cp++ = -1;
for (cp = kip->hisinetaddr; cp < kip->hisinetaddr + sizeof kip->hisinetaddr;)
*cp++ = -1;
/* search for interface */
for (cfp = cfdata; cfp->cf_driver; cfp++) {
if (strcmp(cfp->cf_driver->cd_name, "ipkdb")
|| cfp->cf_unit != unit)
continue;
kip->cfp = cfp;
for (pp = cfp->cf_parents; *pp >= 0; pp++) {
pcfp = cfdata + *pp;
if (pcfp->cf_attach->ca_match((struct device *)0,
pcfp,
kip)
>= 0) {
printf("IPKDB on %s at address %x\n",
kip->name, kip->port);
if (cfp->cf_loc[0]) /* disable interface from system */
pcfp->cf_fstate = FSTATE_FOUND;
return 0;
}
}
}
return -1;
}