/*
* Created from if_ethersubr.c by Andy Dachs <a.dachs@sstl.co.uk>
* Surrey Satellite Technology Limited (SSTL), 2001
* Modified (hacked) to support IP frames transmitted over HDLC. This
* all needs tidying up in future but it does actually work for point
* to point communications. I have an SDL WANic400 synchronous
* communications card that comes with Windows NT drivers. The drivers
* support a mode that they call "Ethernet Emulation". That simply
* puts the IP frame in an HDLC frame without any ethernet header. i.e.
* <HDLC Flag><IpFrame><CRC><HDLC Flag>. There is no addressing beyond
* the IP header information so is only suitable for point to point links
* with a single protocol. "At some point" I will add a Frame Relay header
* but at the moment I have difficulties getting the WANic card driver's
* Frame Relay driver to work.
*
* Copyright (c) 1982, 1989, 1993
* The Regents of the University of California. 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 the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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.
*
* @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
* $Id$
*/
#include <sys/param.h>
/*#include <sys/systm.h>
#include <sys/kernel.h> */
#define KERNEL
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/if_llc.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/ethernet.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#include <stdio.h>
#include "if_hdlcsubr.h"
/*
u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
*/
#define senderr(e) { error = (e); goto bad;}
/*
* HDLC output routine.
* Just transmit the packet (hardware adds flags and CRC)
*/
int
hdlc_output(ifp, m0, dst, rt0)
register struct ifnet *ifp;
struct mbuf *m0;
struct sockaddr *dst;
struct rtentry *rt0;
{
short type;
int s, error = 0;
#if 0
u_char edst[6];
#endif
register struct mbuf *m = m0;
register struct rtentry *rt;
struct mbuf *mcopy = (struct mbuf *)0;
/* register struct ether_header *eh; */
int off, len = m->m_pkthdr.len;
/* printk( "hdlc output" ); */
/* struct arpcom *ac = (struct arpcom *)ifp; */
if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
senderr(ENETDOWN);
rt = rt0;
if (rt) {
if ((rt->rt_flags & RTF_UP) == 0) {
rt0 = rt = rtalloc1(dst, 1, 0UL);
if (rt0)
rt->rt_refcnt--;
else
senderr(EHOSTUNREACH);
}
if (rt->rt_flags & RTF_GATEWAY) {
if (rt->rt_gwroute == 0)
goto lookup;
if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
rtfree(rt); rt = rt0;
lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1,
0UL);
if ((rt = rt->rt_gwroute) == 0)
senderr(EHOSTUNREACH);
}
}
if (rt->rt_flags & RTF_REJECT)
if (rt->rt_rmx.rmx_expire == 0 ||
rtems_bsdnet_seconds_since_boot() < rt->rt_rmx.rmx_expire)
senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
}
switch (dst->sa_family) {
case AF_INET:
#if 0
if (!arpresolve(ac, rt, m, dst, edst, rt0))
return (0); /* if not yet resolved */
#endif
/* If broadcasting on a simplex interface, loopback a copy */
if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
mcopy = m_copy(m, 0, (int)M_COPYALL);
off = m->m_pkthdr.len - m->m_len;
type = htons(ETHERTYPE_IP);
break;
#if 0
case AF_UNSPEC:
eh = (struct ether_header *)dst->sa_data;
(void)memcpy(edst, eh->ether_dhost, sizeof (edst));
type = eh->ether_type;
break;
#endif
default:
printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
dst->sa_family);
senderr(EAFNOSUPPORT);
}
if (mcopy)
(void) looutput(ifp, mcopy, dst, rt);
#if 0
/*
* Add local net header. If no space in first mbuf,
* allocate another.
*/
M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT);
#endif
if (m == 0)
senderr(ENOBUFS);
#if 0
eh = mtod(m, struct ether_header *);
(void)memcpy(&eh->ether_type, &type,
sizeof(eh->ether_type));
(void)memcpy(eh->ether_dhost, edst, sizeof (edst));
(void)memcpy(eh->ether_shost, ac->ac_enaddr,
sizeof(eh->ether_shost));
#endif
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);
splx(s);
senderr(ENOBUFS);
}
IF_ENQUEUE(&ifp->if_snd, m);
if ((ifp->if_flags & IFF_OACTIVE) == 0)
(*ifp->if_start)(ifp);
splx(s);
ifp->if_obytes += len /*+ sizeof (struct ether_header)*/;
if (m->m_flags & M_MCAST)
ifp->if_omcasts++;
return (error);
bad:
if (m)
m_freem(m);
return (error);
}
/*
* Process a received Ethernet packet;
* the packet is in the mbuf chain m without
* the ether header, which is provided separately.
*/
void
hdlc_input(ifp, m)
struct ifnet *ifp;
struct mbuf *m;
{
register struct ifqueue *inq;
int s;
struct ether_header eh;
if ((ifp->if_flags & IFF_UP) == 0) {
m_freem(m);
return;
}
ifp->if_ibytes += m->m_pkthdr.len;
/*
if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
sizeof(etherbroadcastaddr)) == 0)
m->m_flags |= M_BCAST;
else if (eh->ether_dhost[0] & 1)
m->m_flags |= M_MCAST;
*/
if (m->m_flags & (M_BCAST|M_MCAST))
ifp->if_imcasts++;
/*
* RTEMS addition -- allow application to `tap into'
* the incoming packet stream.
*/
if (ifp->if_tap && (*ifp->if_tap)(ifp, &eh, m)) {
m_freem(m);
return;
}
schednetisr(NETISR_IP);
inq = &ipintrq;
s = splimp();
if (IF_QFULL(inq)) {
IF_DROP(inq);
m_freem(m);
} else
IF_ENQUEUE(inq, m);
splx(s);
}
/*
* Perform common duties while attaching to interface list
*/
void
hdlc_ifattach(ifp)
register struct ifnet *ifp;
{
register struct ifaddr *ifa;
register struct sockaddr_dl *sdl;
ifp->if_type = IFT_ETHER;
ifp->if_addrlen = 0;
ifp->if_hdrlen = 0;
ifp->if_mtu = 2048;
if (ifp->if_baudrate == 0)
ifp->if_baudrate = 8000000;
for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
sdl->sdl_family == AF_LINK) {
sdl->sdl_type = IFT_ETHER;
sdl->sdl_alen = ifp->if_addrlen;
/*
bcopy((caddr_t)((struct arpcom *)ifp)->ac_enaddr,
LLADDR(sdl), ifp->if_addrlen);
*/
break;
}
}
/* SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); */
int
hdlc_ioctl(struct ifnet *ifp, int command, caddr_t data)
{
struct ifaddr *ifa = (struct ifaddr *) data;
struct ifreq *ifr = (struct ifreq *) data;
int error = 0;
switch (command) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
switch (ifa->ifa_addr->sa_family) {
#if 0
#ifdef INET
case AF_INET:
ifp->if_init(ifp->if_softc); /* before arpwhohas */
arp_ifinit((struct arpcom *)ifp, ifa);
break;
#endif
#endif
default:
ifp->if_init(ifp->if_softc);
break;
}
break;
case SIOCGIFADDR:
{
struct sockaddr *sa;
sa = (struct sockaddr *) & ifr->ifr_data;
/*
bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr,
(caddr_t) sa->sa_data, ETHER_ADDR_LEN);
*/
}
break;
case SIOCSIFMTU:
/*
* Set the interface MTU.
*/
if (ifr->ifr_mtu > ETHERMTU) {
error = EINVAL;
} else {
ifp->if_mtu = ifr->ifr_mtu;
}
break;
}
return (error);
}
