import Chuck Cranor's ATM driver

1 files changed, 410 insertions, 0 deletions

diff --git a/sys/net/if_atmsubr.c b/sys/net/if_atmsubr.c
new file mode 100644
index 0000000..ee2b1c1
--- /dev/null
+++ b/sys/net/if_atmsubr.c
@@ -0,0 +1,410 @@
+/*      $NetBSD: if_atmsubr.c,v 1.10 1997/03/11 23:19:51 chuck Exp $       */
+
+/*
+ *
+ * Copyright (c) 1996 Charles D. Cranor and Washington University.
+ * 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 and 
+ *	Washington University.
+ * 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>
+#if defined(__FreeBSD__)
+#include <sys/sockio.h>
+#else
+#include <sys/ioctl.h>
+#endif
+#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_atm.h>
+#include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
+#ifdef INET
+#include <netinet/in_var.h>
+#endif
+#ifdef NATM
+#include <netnatm/natm.h>
+#endif
+
+#include "bpfilter.h"
+#if NBPFILTER > 0
+/*
+ * bpf support.
+ * the code is derived from if_loop.c.
+ * bpf support should belong to the driver but it's easier to implement
+ * it here since we can call bpf_mtap before atm_output adds a pseudo
+ * header to the mbuf.
+ *			--kjc
+ */
+#include <sys/time.h>
+#include <net/bpf.h>
+#endif /* NBPFILTER > 0 */
+
+#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]
+ *
+ *   note: special semantic: if (dst == NULL) then we assume "m" already
+ *		has an atm_pseudohdr on it and just send it directly.
+ *		[for native mode ATM output]   if dst is null, then
+ *		rt0 must also be NULL.
+ */
+
+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 */
+
+	}
+
+	/*
+	 * check for non-native ATM traffic   (dst != NULL)
+	 */
+	if (dst) {
+		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: put ATMARP stuff here */
+				/* XXX: watch who frees m on failure */
+			}
+			etype = htons(ETHERTYPE_IP);
+			break;
+#endif
+
+		default:
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+			printf("%s: can't handle af%d\n", ifp->if_xname, 
+			    dst->sa_family);
+#elif defined(__FreeBSD__) || defined(__bsdi__)
+			printf("%s%d: can't handle af%d\n", ifp->if_name, 
+			    ifp->if_unit, dst->sa_family);
+#endif
+			senderr(EAFNOSUPPORT);
+		}
+
+#if NBPFILTER > 0
+		/* BPF write needs to be handled specially */
+		if (dst && dst->sa_family == AF_UNSPEC) {
+		    dst->sa_family = *(mtod(m, int *));
+		    m->m_len -= sizeof(int);
+		    m->m_pkthdr.len -= sizeof(int);
+		    m->m_data += sizeof(int);
+		}
+
+		if (ifp->if_bpf) {
+		    /*
+		     * We need to prepend the address family as
+		     * a four byte field.  Cons up a dummy header
+		     * to pacify bpf.  This is safe because bpf
+		     * will only read from the mbuf (i.e., it won't
+		     * try to free it or keep a pointer a to it).
+		     */
+		    struct mbuf m1;
+		    u_int af = dst->sa_family;
+
+		    m1.m_next = m;
+		    m1.m_len = 4;
+		    m1.m_data = (char *)&af;
+
+		    s = splimp();
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+		bpf_mtap(&ifp->if_bpf, &m0);
+#elif defined(__FreeBSD__)
+		    bpf_mtap(ifp, &m1);
+#endif
+		    splx(s);
+		}
+#endif /* NBPFILTER > 0 */
+
+		/*
+		 * must add atm_pseudohdr to data
+		 */
+		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); 
+					/* note: 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, rxhand)
+	struct ifnet *ifp;
+	register struct atm_pseudohdr *ah;
+	struct mbuf *m;
+	void *rxhand;
+{
+	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;
+
+#if NBPFILTER > 0
+	if (ifp->if_bpf) {
+		/*
+		 * We need to prepend the address family as
+		 * a four byte field.  Cons up a dummy header
+		 * to pacify bpf.  This is safe because bpf
+		 * will only read from the mbuf (i.e., it won't
+		 * try to free it or keep a pointer to it).
+		 */
+		struct mbuf m0;
+		u_int af = AF_INET;
+
+		m0.m_next = m;
+		m0.m_len = 4;
+		m0.m_data = (char *)&af;
+
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+		bpf_mtap(&ifp->if_bpf, &m0);
+#elif defined(__FreeBSD__)
+		bpf_mtap(ifp, &m0);
+#endif
+	}
+#endif /* NBPFILTER > 0 */
+
+	if (rxhand) {
+#ifdef NATM
+	  struct natmpcb *npcb = rxhand;
+	  s = splimp();			/* in case 2 atm cards @ diff lvls */
+	  npcb->npcb_inq++;			/* count # in queue */
+	  splx(s);
+	  schednetisr(NETISR_NATM);
+	  inq = &natmintrq;
+	  m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
+#else
+	  printf("atm_input: NATM detected but not configured in kernel\n");
+	  m_freem(m);
+	  return;
+#endif
+	} else {
+	  /*
+	   * 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)) {
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+	      printf("%s: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
+		  ifp->if_xname, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
+#elif defined(__FreeBSD__) || defined(__bsdi__)
+	      printf("%s%d: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
+		  ifp->if_name, ifp->if_unit, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
+#endif
+	      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;
+
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+	for (ifa = ifp->if_addrlist.tqh_first; ifa != 0;
+	    ifa = ifa->ifa_list.tqe_next)
+#elif defined(__FreeBSD__) && ((__FreeBSD__ > 2) || defined(_NET_IF_VAR_H_))
+/*
+ * for FreeBSD-3.0.  3.0-SNAP-970124 still sets -D__FreeBSD__=2!
+ * XXX -- for now, use newly-introduced "net/if_var.h" as an identifier.
+ * need a better way to identify 3.0.  -- kjc
+ */
+	for (ifa = ifp->if_addrhead.tqh_first; ifa; 
+	    ifa = ifa->ifa_link.tqe_next)
+#elif defined(__FreeBSD__) || defined(__bsdi__)
+	for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 
+#endif
+
+		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;
+		}
+#if NBPFILTER > 0 
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+	bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int));
+#elif defined(__FreeBSD__)
+	bpfattach(ifp, DLT_NULL, sizeof(u_int));
+#endif
+#endif /* NBPFILTER > 0 */
+}