network support for ATM networks (ATM == Async Transfer Mode, not

Automatic Teller Machine).

Currently supports PVCs only (no ATM ARP either).

4 files changed, 617 insertions, 0 deletions

diff --git a/sys/net/if_atm.h b/sys/net/if_atm.h
new file mode 100644
index 00000000000..a836508e04b
--- /dev/null
+++ b/sys/net/if_atm.h
@@ -0,0 +1,88 @@
+/*      $OpenBSD: if_atm.h,v 1.1 1996/06/21 15:13:39 chuck Exp $       */
+
+/*
+ *
+ * Copyright (c) 1996 Charles D. Cranor
+ * 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 Charles D. Cranor.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * 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 AUTHOR 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.
+ */
+
+/*
+ * net/if_atm.h
+ */
+
+/*
+ * pseudo header for packet transmission
+ */
+
+struct atm_pseudohdr {
+  u_int8_t atm_ph[4];	/* flags+VPI+VCI1(msb)+VCI2(lsb) */
+};
+
+#define ATM_PH_FLAGS(X)	((X)->atm_ph[0])
+#define ATM_PH_VPI(X)	((X)->atm_ph[1])
+#define ATM_PH_VCI(X)	((((X)->atm_ph[2]) << 8) | ((X)->atm_ph[3]))
+#define ATM_PH_SETVCI(X,V) { \
+	(X)->atm_ph[2] = ((V) >> 8) & 0xff; \
+	(X)->atm_ph[3] = ((V) & 0xff); \
+}
+
+#define ATM_PH_AAL5    0x01	/* use AAL5? (0 == aal0) */
+#define ATM_PH_LLCSNAP 0x02	/* use the LLC SNAP encoding (iff aal5) */
+
+#define ATM_PH_DRIVER7  0x40	/* reserve for driver's use */
+#define ATM_PH_DRIVER8  0x80	/* reserve for driver's use */
+
+#define ATMMTU		9180	/* ATM MTU size for IP */
+				/* XXX: could be 9188 with LLC/SNAP according
+					to comer */
+
+/* pseudo ioctl */
+#define SIOCATMENA	_IOWR('a', 122, struct atm_pseudohdr) /* enable */
+#define SIOCATMDIS	_IOWR('a', 123, struct atm_pseudohdr) /* disable */
+
+/*
+ * XXX forget all the garbage in if_llc.h and do it the easy way
+ */
+
+#define ATMLLC_HDR "\252\252\3\0\0\0"
+struct atmllc {
+  u_int8_t llchdr[6];	/* aa.aa.03.00.00.00 */
+  u_int8_t type[2];	/* "ethernet" type */
+};
+
+#define ATM_LLC_TYPE(X) (((X)->type[1] << 8) | ((X)->type[0]))
+#define ATM_LLC_SETTYPE(X,V) { \
+	(X)->type[1] = ((V) >> 8) & 0xff; \
+	(X)->type[0] = ((V) & 0xff); \
+}
+
+#ifdef _KERNEL
+void atm_ifattach __P((struct ifnet *));
+int atm_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, 
+	struct rtentry *));
+#endif
diff --git a/sys/net/if_atmsubr.c b/sys/net/if_atmsubr.c
new file mode 100644
index 00000000000..e91d6cff8ad
--- /dev/null
+++ b/sys/net/if_atmsubr.c
@@ -0,0 +1,265 @@
+/*      $OpenBSD: if_atmsubr.c,v 1.1 1996/06/21 15:13:40 chuck Exp $       */
+
+/*
+ *
+ * Copyright (c) 1996 Charles D. Cranor
+ * 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 Charles D. Cranor.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * 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 AUTHOR 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_atmsubr.c
+ */
+
+#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 <machine/cpu.h>
+
+#include <net/if.h>
+#include <net/netisr.h>
+#include <net/route.h>
+#include <net/if_dl.h>
+#include <net/if_types.h>
+#include <net/if_atm.h>
+
+#include <netinet/in.h>
+#include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
+#ifdef INET
+#include <netinet/in_var.h>
+#endif
+
+#define senderr(e) { error = (e); goto bad;}
+
+/*
+ * atm_output: ATM output routine
+ *   inputs:
+ *     "ifp" = ATM interface to output to
+ *     "m0" = the packet to output
+ *     "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI)
+ *     "rt0" = the route to use
+ *   returns: error code   [0 == ok]
+ */
+
+int
+atm_output(ifp, m0, dst, rt0)
+	register struct ifnet *ifp;
+	struct mbuf *m0;
+	struct sockaddr *dst;
+	struct rtentry *rt0;
+{
+	u_int16_t etype = 0;			/* if using LLC/SNAP */
+	int s, error = 0, sz;
+	struct atm_pseudohdr atmdst, *ad;
+	register struct mbuf *m = m0;
+	register struct rtentry *rt;
+	struct atmllc *atmllc;
+	u_int32_t atm_flags;
+
+	if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
+		senderr(ENETDOWN);
+	ifp->if_lastchange = time;
+
+	/*
+	 * check route
+	 */
+	if ((rt = rt0) != NULL) {
+
+		if ((rt->rt_flags & RTF_UP) == 0) { /* route went down! */
+			if ((rt0 = rt = rtalloc1(dst, 0)) != NULL)
+				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, 0);
+				if ((rt = rt->rt_gwroute) == 0)
+					senderr(EHOSTUNREACH);
+			}
+		}
+
+		/* XXX: put RTF_REJECT code here if doing ATMARP */
+
+	}
+	switch (dst->sa_family) {
+#ifdef INET
+	case AF_INET:
+		if (!atmresolve(rt, m, dst, &atmdst)) {
+			m = NULL; /* XXX: atmresolve already free'd it */
+			senderr(EHOSTUNREACH);
+			/* XXX: ATMARP stuff here, watch who frees m on fail */
+		}
+		etype = htons(ETHERTYPE_IP);
+		break;
+#endif
+
+	/* case AF_ATM: XXX: need raw ATM handle here? */
+
+	default:
+		printf("%s: can't handle af%d\n", ifp->if_xname, 
+			dst->sa_family);
+		senderr(EAFNOSUPPORT);
+	}
+
+	sz = sizeof(atmdst);
+	atm_flags = ATM_PH_FLAGS(&atmdst);
+	if (atm_flags & ATM_PH_LLCSNAP) sz += 8; /* sizeof snap == 8 */
+	M_PREPEND(m, sz, M_DONTWAIT);
+	if (m == 0)
+		senderr(ENOBUFS);
+	ad = mtod(m, struct atm_pseudohdr *);
+	*ad = atmdst;
+	if (atm_flags & ATM_PH_LLCSNAP) {
+		atmllc = (struct atmllc *)(ad + 1);
+		bcopy(ATMLLC_HDR, atmllc->llchdr, sizeof(atmllc->llchdr));
+		ATM_LLC_SETTYPE(atmllc, etype); /* already in network order */
+	}
+
+	/*
+	 * Queue message on interface, and start output if interface
+	 * not yet active.
+	 */
+
+	s = splimp();
+	if (IF_QFULL(&ifp->if_snd)) {
+		IF_DROP(&ifp->if_snd);
+		splx(s);
+		senderr(ENOBUFS);
+	}
+	ifp->if_obytes += m->m_pkthdr.len;
+	IF_ENQUEUE(&ifp->if_snd, m);
+	if ((ifp->if_flags & IFF_OACTIVE) == 0)
+		(*ifp->if_start)(ifp);
+	splx(s);
+	return (error);
+
+bad:
+	if (m)
+		m_freem(m);
+	return (error);
+}
+
+/*
+ * Process a received ATM packet;
+ * the packet is in the mbuf chain m.
+ */
+void
+atm_input(ifp, ah, m)
+	struct ifnet *ifp;
+	register struct atm_pseudohdr *ah;
+	struct mbuf *m;
+{
+	register struct ifqueue *inq;
+	u_int16_t etype = ETHERTYPE_IP; /* default */
+	int s;
+
+	if ((ifp->if_flags & IFF_UP) == 0) {
+		m_freem(m);
+		return;
+	}
+	ifp->if_lastchange = time;
+	ifp->if_ibytes += m->m_pkthdr.len;
+
+	/*
+	 * handle LLC/SNAP header, if present
+	 */
+	if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
+	  struct atmllc *alc;
+	  if (m->m_len < sizeof(*alc) && (m = m_pullup(m, sizeof(*alc))) == 0)
+		return; /* failed */
+	  alc = mtod(m, struct atmllc *);
+	  if (bcmp(alc, ATMLLC_HDR, 6)) {
+	    printf("%s: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
+		ifp->if_xname, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
+	    m_freem(m);
+            return;
+	  }
+	  etype = ATM_LLC_TYPE(alc);
+	  m_adj(m, sizeof(*alc));
+	}
+
+	switch (etype) {
+#ifdef INET
+	case ETHERTYPE_IP:
+		schednetisr(NETISR_IP);
+		inq = &ipintrq;
+		break;
+#endif
+	default:
+	    m_freem(m);
+	    return;
+	}
+
+	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
+atm_ifattach(ifp)
+	register struct ifnet *ifp;
+{
+	register struct ifaddr *ifa;
+	register struct sockaddr_dl *sdl;
+
+	ifp->if_type = IFT_ATM;
+	ifp->if_addrlen = 0;
+	ifp->if_hdrlen = 0;
+	ifp->if_mtu = ATMMTU;
+	ifp->if_output = atm_output;
+	for (ifa = ifp->if_addrlist.tqh_first; ifa != 0;
+	    ifa = ifa->ifa_list.tqe_next)
+		if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
+		    sdl->sdl_family == AF_LINK) {
+			sdl->sdl_type = IFT_ATM;
+			sdl->sdl_alen = ifp->if_addrlen;
+#ifdef notyet /* if using ATMARP, store hardware address using the next line */
+			bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen);
+#endif
+			break;
+		}
+}
diff --git a/sys/netinet/if_atm.c b/sys/netinet/if_atm.c
new file mode 100644
index 00000000000..eb0e52e759b
--- /dev/null
+++ b/sys/netinet/if_atm.c
@@ -0,0 +1,222 @@
+/*      $OpenBSD: if_atm.c,v 1.1 1996/06/21 15:14:35 chuck Exp $       */
+
+/*
+ *
+ * Copyright (c) 1996 Charles D. Cranor
+ * 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 Charles D. Cranor.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * 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 AUTHOR 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.
+ */
+
+/*
+ * IP <=> ATM address resolution.
+ */
+
+#ifdef INET
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/kernel.h>
+#include <sys/errno.h>
+#include <sys/ioctl.h>
+#include <sys/syslog.h>
+#include <sys/proc.h>
+
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/route.h>
+#include <net/if_atm.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/in_var.h>
+#include <netinet/ip.h>
+#include <netinet/if_atm.h>
+
+#define SDL(s) ((struct sockaddr_dl *)s)
+
+/*
+ * atm_rtrequest: handle ATM rt request (in support of generic code)
+ *   inputs: "req" = request code
+ *           "rt" = route entry
+ *           "sa" = sockaddr
+ */
+
+void
+atm_rtrequest(req, rt, sa)
+	int req;
+	register struct rtentry *rt;
+	struct sockaddr *sa;
+{
+	register struct sockaddr *gate = rt->rt_gateway;
+	static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
+
+	if (rt->rt_flags & RTF_GATEWAY)   /* link level requests only */
+		return;
+
+	switch (req) {
+
+	case RTM_RESOLVE: /* resolve: only happens when cloning */
+		printf("atm_rtrequest: RTM_RESOLVE request detected?\n");
+		break;
+
+	case RTM_ADD:
+
+		/*
+		 * route added by a command (e.g. ifconfig, route, arp...).
+		 *
+		 * first check to see if this is not a host route, in which
+		 * case we are being called via "ifconfig" to set the address.
+		 */
+
+		if ((rt->rt_flags & RTF_HOST) == 0) { 
+			rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl);
+			gate = rt->rt_gateway;
+			SDL(gate)->sdl_type = rt->rt_ifp->if_type;
+			SDL(gate)->sdl_index = rt->rt_ifp->if_index;
+			break;
+		}
+
+		if ((rt->rt_flags & RTF_CLONING) != 0) {
+			printf("atm_rtrequest: cloning route detected?\n");
+			break;
+		}
+		if (gate->sa_family != AF_LINK ||
+		    gate->sa_len < sizeof(null_sdl)) {
+			log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
+			break;
+		}
+
+#ifdef DIAGNOSTIC
+		if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl");
+#endif
+
+		/*
+		 * let the lower level know this circuit is active
+		 */
+		if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMENA, 
+				LLADDR(SDL(gate))) != 0) {
+			printf("atm: couldn't add VC\n");
+			/* XXX: do we need to do anything else to recover? */
+			break;
+		}
+
+		SDL(gate)->sdl_type = rt->rt_ifp->if_type;
+		SDL(gate)->sdl_index = rt->rt_ifp->if_index;
+
+		break;
+
+	case RTM_DELETE:
+
+		/*
+		 * tell the lower layer to disable this circuit
+		 */
+		(void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMDIS,
+				LLADDR(SDL(gate)));
+
+		break;
+	}
+}
+
+/*
+ * atmresolve:
+ *   inputs:
+ *     [1] "rt" = the link level route to use (or null if need to look one up)
+ *     [2] "m" = mbuf containing the data to be sent
+ *     [3] "dst" = sockaddr_in (IP) address of dest.
+ *   output:
+ *     [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
+ *   return: 
+ *     0 == resolve FAILED; note that "m" gets m_freem'd in this case
+ *     1 == resolve OK; desten contains result
+ *
+ *   XXX: will need more work if we wish to support ATMARP in the kernel,
+ *   but this is enough for PVCs entered via the "route" command.
+ */
+
+int
+atmresolve(rt, m, dst, desten)
+
+register struct rtentry *rt;
+struct mbuf *m;
+register struct sockaddr *dst;
+register struct atm_pseudohdr *desten;	/* OUT */
+
+{
+	struct sockaddr_dl *sdl;
+
+	if (m->m_flags & (M_BCAST|M_MCAST)) {
+		log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped");
+		goto bad;
+	}
+
+	if (rt == NULL) {
+		rt = rtalloc1(dst, 0);
+		if (rt == NULL) goto bad; /* failed */
+		rt->rt_refcnt--;	/* don't keep LL references */
+		if ((rt->rt_flags & RTF_GATEWAY) != 0 || 
+			(rt->rt_flags & RTF_LLINFO) == 0 ||
+			/* XXX: are we using LLINFO? */
+			rt->rt_gateway->sa_family != AF_LINK) {
+				goto bad;
+		}
+	}
+
+	/*
+	 * note that rt_gateway is a sockaddr_dl which contains the 
+	 * atm_pseudohdr data structure for this route.   we currently
+	 * don't need any rt_llinfo info (but will if we want to support
+	 * ATM ARP [c.f. if_ether.c]).
+	 */
+
+	sdl = SDL(rt->rt_gateway);
+
+	/*
+	 * Check the address family and length is valid, the address
+	 * is resolved; otherwise, try to resolve.
+	 */
+
+
+	if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == sizeof(*desten)) {
+		bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
+		return(1);	/* ok, go for it! */
+	}
+
+	/*
+	 * we got an entry, but it doesn't have valid link address
+	 * info in it (it is prob. the interface route, which has
+	 * sdl_alen == 0).    dump packet.  (fall through to "bad").
+	 */
+
+bad:
+	m_freem(m);
+	return(0);
+}
+#endif /* INET */
diff --git a/sys/netinet/if_atm.h b/sys/netinet/if_atm.h
new file mode 100644
index 00000000000..054cd1a2e99
--- /dev/null
+++ b/sys/netinet/if_atm.h
@@ -0,0 +1,42 @@
+/*      $OpenBSD: if_atm.h,v 1.1 1996/06/21 15:14:35 chuck Exp $       */
+
+/*
+ *
+ * Copyright (c) 1996 Charles D. Cranor
+ * 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 Charles D. Cranor.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * 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 AUTHOR 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_atm.h
+ */
+
+#ifdef _KERNEL
+void atm_rtrequest __P((int, struct rtentry *, struct sockaddr *));
+int atmresolve __P((struct rtentry *, struct mbuf *, struct sockaddr *, 
+		struct atm_pseudohdr *));
+#endif /* _KERNEL */