NetBSD-5.0.2/sys/net/if_hippisubr.c
/* $NetBSD: if_hippisubr.c,v 1.34 2008/02/20 17:05:53 matt Exp $ */
/*
* 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. 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_hippisubr.c,v 1.34 2008/02/20 17:05:53 matt Exp $");
#include "opt_inet.h"
#include "bpfilter.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#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/cpu.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>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include <net/if_hippi.h>
#include <netinet/in.h>
#if defined(INET) || defined(INET6)
#include <netinet/in_var.h>
#endif
#define senderr(e) { error = (e); goto bad;}
#ifndef llc_snap
#define llc_snap llc_un.type_snap
#endif
static int hippi_output(struct ifnet *, struct mbuf *,
const struct sockaddr *, struct rtentry *);
static void hippi_input(struct ifnet *, struct mbuf *);
/*
* HIPPI output routine.
* Encapsulate a packet of type family for the local net.
* I don't know anything about the mapping of AppleTalk or OSI
* protocols to HIPPI, so I don't include any code for them.
*/
static int
hippi_output(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst,
struct rtentry *rt0)
{
uint16_t htype;
uint32_t ifield = 0;
int error = 0;
struct mbuf *m = m0;
struct rtentry *rt;
struct hippi_header *hh;
uint32_t *cci;
uint32_t d2_len;
ALTQ_DECL(struct altq_pktattr pktattr;)
if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
senderr(ENETDOWN);
/* HIPPI doesn't really do broadcast or multicast right now */
if (m->m_flags & (M_BCAST | M_MCAST))
senderr(EOPNOTSUPP); /* XXX: some other error? */
if ((rt = rt0) != NULL) {
if ((rt->rt_flags & RTF_UP) == 0) {
if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) {
rt->rt_refcnt--;
if (rt->rt_ifp != ifp)
return (*rt->rt_ifp->if_output)
(ifp, m0, dst, rt);
} else
senderr(EHOSTUNREACH);
}
if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) {
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);
if ((rt = rt->rt_gwroute) == 0)
senderr(EHOSTUNREACH);
/* the "G" test below also prevents rt == rt0 */
if ((rt->rt_flags & RTF_GATEWAY) ||
(rt->rt_ifp != ifp)) {
rt->rt_refcnt--;
rt0->rt_gwroute = 0;
senderr(EHOSTUNREACH);
}
}
}
if (rt->rt_flags & RTF_REJECT)
if (rt->rt_rmx.rmx_expire == 0 || /* XXX: no ARP */
time_second < rt->rt_rmx.rmx_expire)
senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
}
/*
* If the queueing discipline needs packet classification,
* do it before prepending link headers.
*/
IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr);
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
if (rt) {
const struct sockaddr_dl *sdl =
satocsdl(rt->rt_gateway);
if (sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0)
memcpy(&ifield, CLLADDR(sdl), sizeof(ifield));
}
if (!ifield) /* XXX: bogus check, but helps us get going */
senderr(EHOSTUNREACH);
htype = htons(ETHERTYPE_IP);
break;
#endif
#ifdef INET6
case AF_INET6:
if (rt) {
const struct sockaddr_dl *sdl =
satocsdl(rt->rt_gateway);
if (sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0)
memcpy(&ifield, CLLADDR(sdl), sizeof(ifield));
}
if (!ifield) /* XXX: bogus check, but helps us get going */
senderr(EHOSTUNREACH);
htype = htons(ETHERTYPE_IPV6);
break;
#endif
default:
printf("%s: can't handle af%d\n", ifp->if_xname,
dst->sa_family);
senderr(EAFNOSUPPORT);
}
if (htype != 0) {
struct llc *l;
M_PREPEND(m, sizeof (struct llc), M_DONTWAIT);
if (m == 0)
senderr(ENOBUFS);
l = mtod(m, struct llc *);
l->llc_control = LLC_UI;
l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
l->llc_snap.org_code[0] = l->llc_snap.org_code[1] =
l->llc_snap.org_code[2] = 0;
bcopy((void *) &htype, (void *) &l->llc_snap.ether_type,
sizeof(uint16_t));
}
d2_len = m->m_pkthdr.len;
/*
* Add local net header. If no space in first mbuf,
* allocate another.
*/
M_PREPEND(m, sizeof (struct hippi_header) + 8, M_DONTWAIT);
if (m == 0)
senderr(ENOBUFS);
cci = mtod(m, uint32_t *);
memset(cci, 0, sizeof(struct hippi_header) + 8);
cci[0] = 0;
cci[1] = ifield;
hh = (struct hippi_header *) &cci[2];
hh->hi_fp.fp_ulp = HIPPI_ULP_802;
hh->hi_fp.fp_flags = HIPPI_FP_D1_PRESENT;
hh->hi_fp.fp_offsets = htons(sizeof(struct hippi_le));
hh->hi_fp.fp_d2_len = htonl(d2_len);
/* Pad out the D2 area to end on a quadword (64-bit) boundry. */
if (d2_len % 8 != 0) {
static uint32_t buffer[2] = {0, 0};
m_copyback(m, m->m_pkthdr.len, 8 - d2_len % 8, (void *) buffer);
}
return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr));
bad:
if (m)
m_freem(m);
return (error);
}
/*
* Process a received HIPPI packet;
* the packet is in the mbuf chain m with
* the HIPPI header.
*/
static void
hippi_input(struct ifnet *ifp, struct mbuf *m)
{
struct ifqueue *inq;
struct llc *l;
uint16_t htype;
struct hippi_header *hh;
int s;
if ((ifp->if_flags & IFF_UP) == 0) {
m_freem(m);
return;
}
/* XXX: need to check flags and drop if bogus! */
hh = mtod(m, struct hippi_header *);
ifp->if_ibytes += m->m_pkthdr.len;
if (hh->hi_le.le_dest_addr[0] & 1) {
if (memcmp(etherbroadcastaddr, hh->hi_le.le_dest_addr,
sizeof(etherbroadcastaddr)) == 0)
m->m_flags |= M_BCAST;
else
m->m_flags |= M_MCAST;
}
if (m->m_flags & (M_BCAST|M_MCAST))
ifp->if_imcasts++;
/* Skip past the HIPPI header. */
m_adj(m, sizeof(struct hippi_header));
l = mtod(m, struct llc *);
if (l->llc_dsap != LLC_SNAP_LSAP) {
m_freem(m);
return;
}
htype = ntohs(l->llc_snap.ether_type);
m_adj(m, 8);
switch (htype) {
#ifdef INET
case ETHERTYPE_IP:
schednetisr(NETISR_IP);
inq = &ipintrq;
break;
#endif
#ifdef INET6
case ETHERTYPE_IPV6:
schednetisr(NETISR_IPV6);
inq = &ip6intrq;
break;
#endif
default:
m_freem(m);
return;
}
s = splnet();
if (IF_QFULL(inq)) {
IF_DROP(inq);
m_freem(m);
} else
IF_ENQUEUE(inq, m);
splx(s);
}
/*
* Handle packet from HIPPI that has no MAC header
*/
#ifdef INET
void
hippi_ip_input(struct ifnet *ifp, struct mbuf *m)
{
struct ifqueue *inq;
int s;
schednetisr(NETISR_IP);
inq = &ipintrq;
s = splnet();
if (IF_QFULL(inq)) {
IF_DROP(inq);
m_freem(m);
} else
IF_ENQUEUE(inq, m);
splx(s);
}
#endif
/*
* Perform common duties while attaching to interface list
*/
void
hippi_ifattach(struct ifnet *ifp, void *lla)
{
ifp->if_type = IFT_HIPPI;
ifp->if_hdrlen = sizeof(struct hippi_header) + 8; /* add CCI */
ifp->if_dlt = DLT_HIPPI;
ifp->if_mtu = HIPPIMTU;
ifp->if_output = hippi_output;
ifp->if_input = hippi_input;
ifp->if_baudrate = IF_Mbps(800); /* XXX double-check */
if_set_sadl(ifp, lla, 6);
#if NBPFILTER > 0
bpfattach(ifp, DLT_HIPPI, sizeof(struct hippi_header));
#endif
}