import Chuck Cranor's ATM driver

1 files changed, 822 insertions, 0 deletions

diff --git a/sys/netnatm/natm.c b/sys/netnatm/natm.c
new file mode 100644
index 0000000..f78c3cb
--- /dev/null
+++ b/sys/netnatm/natm.c
@@ -0,0 +1,822 @@
+/*	$NetBSD: natm.c,v 1.5 1996/11/09 03:26:26 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.
+ */
+
+/*
+ * natm.c: native mode ATM access (both aal0 and aal5).
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/domain.h>
+#if defined(__FreeBSD__)
+#include <sys/sockio.h>
+#else
+#include <sys/ioctl.h>
+#endif
+#include <sys/proc.h>
+#include <sys/protosw.h>
+#include <sys/mbuf.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+
+#include <net/if.h>
+#include <net/if_atm.h>
+#include <net/netisr.h>
+#include <net/radix.h>
+#include <net/route.h>
+
+#include <netinet/in.h>
+
+#include <netnatm/natm.h>
+
+u_long natm5_sendspace = 16*1024;
+u_long natm5_recvspace = 16*1024;
+
+u_long natm0_sendspace = 16*1024;
+u_long natm0_recvspace = 16*1024;
+
+/*
+ * user requests
+ */
+#ifdef FREEBSD_USRREQS
+/*
+ * FreeBSD new usrreqs supersedes pr_usrreq.
+ */
+static int natm_usr_attach __P((struct socket *, int, struct proc *));
+static int natm_usr_detach __P((struct socket *));
+static int natm_usr_connect __P((struct socket *, struct mbuf *,
+				 struct proc *));
+static int natm_usr_disconnect __P((struct socket *));
+static int natm_usr_shutdown __P((struct socket *));
+static int natm_usr_send __P((struct socket *, int, struct mbuf *,
+			      struct mbuf *, struct mbuf *, struct proc *));
+static int natm_usr_peeraddr __P((struct socket *, struct mbuf *));
+static int natm_usr_control __P((struct socket *, int, caddr_t,
+				 struct ifnet *, struct proc *));
+static int natm_usr_abort __P((struct socket *));
+static int natm_usr_bind __P((struct socket *, struct mbuf *, struct proc *));
+static int natm_usr_sockaddr __P((struct socket *, struct mbuf *));
+
+static int
+natm_usr_attach(struct socket *so, int proto, struct proc *p)
+{
+    struct natmpcb *npcb;
+    int error = 0;
+    int s = SPLSOFTNET();
+
+    npcb = (struct natmpcb *) so->so_pcb;
+
+    if (npcb) {
+	error = EISCONN;
+	goto out;
+    }
+
+    if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
+	if (proto == PROTO_NATMAAL5) 
+	    error = soreserve(so, natm5_sendspace, natm5_recvspace);
+	else
+	    error = soreserve(so, natm0_sendspace, natm0_recvspace);
+        if (error)
+          goto out;
+    }
+
+    so->so_pcb = (caddr_t) (npcb = npcb_alloc(M_WAITOK));
+    npcb->npcb_socket = so;
+ out:
+    splx(s);
+    return (error);
+}
+
+static int
+natm_usr_detach(struct socket *so)
+{
+    struct natmpcb *npcb;
+    int error = 0;
+    int s = SPLSOFTNET();
+
+    npcb = (struct natmpcb *) so->so_pcb;
+    if (npcb == NULL) {
+	error = EINVAL;
+	goto out;
+    }
+
+    /*
+     * we turn on 'drain' *before* we sofree.
+     */
+    npcb_free(npcb, NPCB_DESTROY);	/* drain */
+    so->so_pcb = NULL;
+    sofree(so);
+ out:
+    splx(s);
+    return (error);
+}
+
+static int
+natm_usr_connect(struct socket *so, struct mbuf *nam, struct proc *p)
+{
+    struct natmpcb *npcb;
+    struct sockaddr_natm *snatm;
+    struct atm_pseudoioctl api;
+    struct atm_pseudohdr *aph;
+    struct ifnet *ifp;
+    int error = 0;
+    int s2, s = SPLSOFTNET();
+    int proto = so->so_proto->pr_protocol;
+
+    npcb = (struct natmpcb *) so->so_pcb;
+    if (npcb == NULL) {
+	error = EINVAL;
+	goto out;
+    }
+
+    /*
+     * validate nam and npcb
+     */
+
+    if (nam->m_len != sizeof(*snatm)) {
+        error = EINVAL;
+	goto out;
+    }
+    snatm = mtod(nam, struct sockaddr_natm *);
+    if (snatm->snatm_len != sizeof(*snatm) ||
+	(npcb->npcb_flags & NPCB_FREE) == 0) {
+	error = EINVAL;
+	goto out;
+    }
+    if (snatm->snatm_family != AF_NATM) {
+	error = EAFNOSUPPORT;
+	goto out;
+    }
+
+    snatm->snatm_if[IFNAMSIZ-1] = '\0';  /* XXX ensure null termination
+					    since ifunit() uses strcmp */
+
+    /*
+     * convert interface string to ifp, validate.
+     */
+
+    ifp = ifunit(snatm->snatm_if);
+    if (ifp == NULL || (ifp->if_flags & IFF_RUNNING) == 0) {
+	error = ENXIO;
+	goto out;
+    }
+    if (ifp->if_output != atm_output) {
+	error = EAFNOSUPPORT;
+	goto out;
+    }
+
+    /*
+     * register us with the NATM PCB layer
+     */
+
+    if (npcb_add(npcb, ifp, snatm->snatm_vci, snatm->snatm_vpi) != npcb) {
+        error = EADDRINUSE;
+        goto out;
+    }
+
+    /*
+     * enable rx
+     */
+
+    ATM_PH_FLAGS(&api.aph) = (proto == PROTO_NATMAAL5) ? ATM_PH_AAL5 : 0;
+    ATM_PH_VPI(&api.aph) = npcb->npcb_vpi;
+    ATM_PH_SETVCI(&api.aph, npcb->npcb_vci);
+    api.rxhand = npcb;
+    s2 = splimp();
+    if (ifp->if_ioctl == NULL || 
+	ifp->if_ioctl(ifp, SIOCATMENA, (caddr_t) &api) != 0) {
+	splx(s2);
+	npcb_free(npcb, NPCB_REMOVE);
+        error = EIO;
+	goto out;
+    }
+    splx(s2);
+
+    soisconnected(so);
+
+ out:
+    splx(s);
+    return (error);
+}
+
+static int
+natm_usr_disconnect(struct socket *so)
+{
+    struct natmpcb *npcb;
+    struct sockaddr_natm *snatm;
+    struct atm_pseudoioctl api;
+    struct atm_pseudohdr *aph;
+    struct ifnet *ifp;
+    int error = 0;
+    int s2, s = SPLSOFTNET();
+    int proto = so->so_proto->pr_protocol;
+
+    npcb = (struct natmpcb *) so->so_pcb;
+    if (npcb == NULL) {
+	error = EINVAL;
+	goto out;
+    }
+
+    if ((npcb->npcb_flags & NPCB_CONNECTED) == 0) {
+        printf("natm: disconnected check\n");
+        error = EIO;
+	goto out;
+    }
+    ifp = npcb->npcb_ifp;
+
+    /*
+     * disable rx
+     */
+
+    ATM_PH_FLAGS(&api.aph) = ATM_PH_AAL5;
+    ATM_PH_VPI(&api.aph) = npcb->npcb_vpi;
+    ATM_PH_SETVCI(&api.aph, npcb->npcb_vci);
+    api.rxhand = npcb;
+    s2 = splimp();
+    if (ifp->if_ioctl != NULL)
+	ifp->if_ioctl(ifp, SIOCATMDIS, (caddr_t) &api);
+    splx(s2);
+
+    npcb_free(npcb, NPCB_REMOVE);
+    soisdisconnected(so);
+
+ out:
+    splx(s);
+    return (error);
+}
+
+static int
+natm_usr_shutdown(struct socket *so)
+{
+    socantsendmore(so);
+    return 0;
+}
+
+static int
+natm_usr_send(struct socket *so, int flags, struct mbuf *m, struct mbuf *nam,
+	     struct mbuf *control, struct proc *p)
+{
+    struct natmpcb *npcb;
+    struct atm_pseudohdr *aph;
+    int error = 0;
+    int s = SPLSOFTNET();
+    int proto = so->so_proto->pr_protocol;
+
+    npcb = (struct natmpcb *) so->so_pcb;
+    if (npcb == NULL) {
+	error = EINVAL;
+	goto out;
+    }
+
+    if (control && control->m_len) {
+	m_freem(control);
+	m_freem(m);
+	error = EINVAL;
+	goto out;
+    }
+
+    /*
+     * send the data.   we must put an atm_pseudohdr on first
+     */
+
+    M_PREPEND(m, sizeof(*aph), M_WAITOK);
+    if (m == NULL) {
+        error = ENOBUFS;
+	goto out;
+    }
+    aph = mtod(m, struct atm_pseudohdr *);
+    ATM_PH_VPI(aph) = npcb->npcb_vpi;
+    ATM_PH_SETVCI(aph, npcb->npcb_vci);
+    ATM_PH_FLAGS(aph) = (proto == PROTO_NATMAAL5) ? ATM_PH_AAL5 : 0;
+
+    error = atm_output(npcb->npcb_ifp, m, NULL, NULL);
+
+ out:
+    splx(s);
+    return (error);
+}
+
+static int
+natm_usr_peeraddr(struct socket *so, struct mbuf *nam)
+{
+    struct natmpcb *npcb;
+    struct sockaddr_natm *snatm;
+    int error = 0;
+    int s = SPLSOFTNET();
+
+    npcb = (struct natmpcb *) so->so_pcb;
+    if (npcb == NULL) {
+	error = EINVAL;
+	goto out;
+    }
+
+    snatm = mtod(nam, struct sockaddr_natm *);
+    bzero(snatm, sizeof(*snatm));
+    nam->m_len = snatm->snatm_len = sizeof(*snatm);
+    snatm->snatm_family = AF_NATM;
+    sprintf(snatm->snatm_if, "%s%d", npcb->npcb_ifp->if_name,
+	    npcb->npcb_ifp->if_unit);
+    snatm->snatm_vci = npcb->npcb_vci;
+    snatm->snatm_vpi = npcb->npcb_vpi;
+
+ out:
+    splx(s);
+    return (error);
+}
+
+static int
+natm_usr_control(struct socket *so, int cmd, caddr_t arg,
+		 struct ifnet *ifp, struct proc *p)
+{
+    struct natmpcb *npcb;
+    struct atm_rawioctl ario;
+    int error = 0;
+    int s = SPLSOFTNET();
+
+    npcb = (struct natmpcb *) so->so_pcb;
+    if (npcb == NULL) {
+	error = EINVAL;
+	goto out;
+    }
+
+    /*
+     * raw atm ioctl.   comes in as a SIOCRAWATM.   we convert it to
+     * SIOCXRAWATM and pass it to the driver.
+     */
+    if (cmd == SIOCRAWATM) {
+        if (npcb->npcb_ifp == NULL) {
+	    error = ENOTCONN;
+	    goto out;
+        }
+        ario.npcb = npcb;
+        ario.rawvalue = *((int *)arg);
+        error = npcb->npcb_ifp->if_ioctl(npcb->npcb_ifp, 
+					 SIOCXRAWATM, (caddr_t) &ario);
+	if (!error) {
+	    if (ario.rawvalue) 
+		npcb->npcb_flags |= NPCB_RAW;
+	    else
+		npcb->npcb_flags &= ~(NPCB_RAW);
+	}
+    }
+    else
+	error = EOPNOTSUPP;
+
+ out:
+    splx(s);
+    return (error);
+}
+
+static int
+natm_usr_abort(struct socket *so)
+{
+    return natm_usr_shutdown(so);
+}
+
+static int
+natm_usr_bind(struct socket *so, struct mbuf *nam, struct proc *p)
+{
+    return EOPNOTSUPP;
+}
+
+static int
+natm_usr_sockaddr(struct socket *so, struct mbuf *nam)
+{
+    return EOPNOTSUPP;
+}
+
+/* xxx - should be const */
+struct pr_usrreqs natm_usrreqs = {
+	natm_usr_abort, pru_accept_notsupp, natm_usr_attach, natm_usr_bind,
+	natm_usr_connect, pru_connect2_notsupp, natm_usr_control,
+	natm_usr_detach, natm_usr_disconnect, pru_listen_notsupp,
+	natm_usr_peeraddr, pru_rcvd_notsupp, pru_rcvoob_notsupp,
+	natm_usr_send, pru_sense_null, natm_usr_shutdown,
+	natm_usr_sockaddr, sosend, soreceive, soselect
+};
+
+#else  /* !FREEBSD_USRREQS */
+
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+int natm_usrreq(so, req, m, nam, control, p)
+#elif defined(__FreeBSD__)
+int natm_usrreq(so, req, m, nam, control)
+#endif
+
+struct socket *so;
+int req;
+struct mbuf *m, *nam, *control;
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+struct proc *p;
+#endif
+
+{
+  int error = 0, s, s2;
+  struct natmpcb *npcb;
+  struct sockaddr_natm *snatm;
+  struct atm_pseudoioctl api;
+  struct atm_pseudohdr *aph;
+  struct atm_rawioctl ario;
+  struct ifnet *ifp;
+  int proto = so->so_proto->pr_protocol;
+
+  s = SPLSOFTNET();
+
+  npcb = (struct natmpcb *) so->so_pcb;
+
+  if (npcb == NULL && req != PRU_ATTACH) {
+    error = EINVAL;
+    goto done;
+  }
+    
+
+  switch (req) {
+    case PRU_ATTACH:			/* attach protocol to up */
+
+      if (npcb) {
+	error = EISCONN;
+	break;
+      }
+
+      if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
+	if (proto == PROTO_NATMAAL5) 
+          error = soreserve(so, natm5_sendspace, natm5_recvspace);
+	else
+          error = soreserve(so, natm0_sendspace, natm0_recvspace);
+        if (error)
+          break;
+      }
+
+      so->so_pcb = (caddr_t) (npcb = npcb_alloc(M_WAITOK));
+      npcb->npcb_socket = so;
+
+      break;
+
+    case PRU_DETACH:			/* detach protocol from up */
+
+      /*
+       * we turn on 'drain' *before* we sofree.
+       */
+
+      npcb_free(npcb, NPCB_DESTROY);	/* drain */
+      so->so_pcb = NULL;
+      sofree(so);
+
+      break;
+
+    case PRU_CONNECT:			/* establish connection to peer */
+
+      /*
+       * validate nam and npcb
+       */
+
+      if (nam->m_len != sizeof(*snatm)) {
+        error = EINVAL;
+	break;
+      }
+      snatm = mtod(nam, struct sockaddr_natm *);
+      if (snatm->snatm_len != sizeof(*snatm) ||
+		(npcb->npcb_flags & NPCB_FREE) == 0) {
+	error = EINVAL;
+	break;
+      }
+      if (snatm->snatm_family != AF_NATM) {
+	error = EAFNOSUPPORT;
+	break;
+      }
+
+      snatm->snatm_if[IFNAMSIZ-1] = '\0';  /* XXX ensure null termination
+						since ifunit() uses strcmp */
+
+      /*
+       * convert interface string to ifp, validate.
+       */
+
+      ifp = ifunit(snatm->snatm_if);
+      if (ifp == NULL || (ifp->if_flags & IFF_RUNNING) == 0) {
+	error = ENXIO;
+	break;
+      }
+      if (ifp->if_output != atm_output) {
+	error = EAFNOSUPPORT;
+	break;
+      }
+
+
+      /*
+       * register us with the NATM PCB layer
+       */
+
+      if (npcb_add(npcb, ifp, snatm->snatm_vci, snatm->snatm_vpi) != npcb) {
+        error = EADDRINUSE;
+        break;
+      }
+
+      /*
+       * enable rx
+       */
+
+      ATM_PH_FLAGS(&api.aph) = (proto == PROTO_NATMAAL5) ? ATM_PH_AAL5 : 0;
+      ATM_PH_VPI(&api.aph) = npcb->npcb_vpi;
+      ATM_PH_SETVCI(&api.aph, npcb->npcb_vci);
+      api.rxhand = npcb;
+      s2 = splimp();
+      if (ifp->if_ioctl == NULL || 
+	  ifp->if_ioctl(ifp, SIOCATMENA, (caddr_t) &api) != 0) {
+	splx(s2);
+	npcb_free(npcb, NPCB_REMOVE);
+        error = EIO;
+	break;
+      }
+      splx(s2);
+
+      soisconnected(so);
+
+      break;
+
+    case PRU_DISCONNECT:		/* disconnect from peer */
+
+      if ((npcb->npcb_flags & NPCB_CONNECTED) == 0) {
+        printf("natm: disconnected check\n");
+        error = EIO;
+	break;
+      }
+      ifp = npcb->npcb_ifp;
+
+      /*
+       * disable rx
+       */
+
+      ATM_PH_FLAGS(&api.aph) = ATM_PH_AAL5;
+      ATM_PH_VPI(&api.aph) = npcb->npcb_vpi;
+      ATM_PH_SETVCI(&api.aph, npcb->npcb_vci);
+      api.rxhand = npcb;
+      s2 = splimp();
+      if (ifp->if_ioctl != NULL)
+	  ifp->if_ioctl(ifp, SIOCATMDIS, (caddr_t) &api);
+      splx(s2);
+
+      npcb_free(npcb, NPCB_REMOVE);
+      soisdisconnected(so);
+
+      break;
+
+    case PRU_SHUTDOWN:			/* won't send any more data */
+      socantsendmore(so);
+      break;
+
+    case PRU_SEND:			/* send this data */
+      if (control && control->m_len) {
+	m_freem(control);
+	m_freem(m);
+	error = EINVAL;
+	break;
+      }
+
+      /*
+       * send the data.   we must put an atm_pseudohdr on first
+       */
+
+      M_PREPEND(m, sizeof(*aph), M_WAITOK);
+      if (m == NULL) {
+        error = ENOBUFS;
+	break;
+      }
+      aph = mtod(m, struct atm_pseudohdr *);
+      ATM_PH_VPI(aph) = npcb->npcb_vpi;
+      ATM_PH_SETVCI(aph, npcb->npcb_vci);
+      ATM_PH_FLAGS(aph) = (proto == PROTO_NATMAAL5) ? ATM_PH_AAL5 : 0;
+
+      error = atm_output(npcb->npcb_ifp, m, NULL, NULL);
+
+      break;
+
+    case PRU_SENSE:			/* return status into m */
+      /* return zero? */
+      break;
+
+    case PRU_PEERADDR:			/* fetch peer's address */
+      snatm = mtod(nam, struct sockaddr_natm *);
+      bzero(snatm, sizeof(*snatm));
+      nam->m_len = snatm->snatm_len = sizeof(*snatm);
+      snatm->snatm_family = AF_NATM;
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+      bcopy(npcb->npcb_ifp->if_xname, snatm->snatm_if, sizeof(snatm->snatm_if));
+#elif defined(__FreeBSD__)
+      sprintf(snatm->snatm_if, "%s%d", npcb->npcb_ifp->if_name,
+	npcb->npcb_ifp->if_unit);
+#endif
+      snatm->snatm_vci = npcb->npcb_vci;
+      snatm->snatm_vpi = npcb->npcb_vpi;
+      break;
+
+    case PRU_CONTROL:			/* control operations on protocol */
+      /*
+       * raw atm ioctl.   comes in as a SIOCRAWATM.   we convert it to
+       * SIOCXRAWATM and pass it to the driver.
+       */
+      if ((u_long)m == SIOCRAWATM) {
+        if (npcb->npcb_ifp == NULL) {
+          error = ENOTCONN;
+          break;
+        }
+        ario.npcb = npcb;
+        ario.rawvalue = *((int *)nam);
+        error = npcb->npcb_ifp->if_ioctl(npcb->npcb_ifp, 
+				SIOCXRAWATM, (caddr_t) &ario);
+	if (!error) {
+          if (ario.rawvalue) 
+	    npcb->npcb_flags |= NPCB_RAW;
+	  else
+	    npcb->npcb_flags &= ~(NPCB_RAW);
+	}
+
+        break;
+      }
+
+      error = EOPNOTSUPP;
+      break;
+
+    case PRU_BIND:			/* bind socket to address */
+    case PRU_LISTEN:			/* listen for connection */
+    case PRU_ACCEPT:			/* accept connection from peer */
+    case PRU_CONNECT2:			/* connect two sockets */
+    case PRU_ABORT:			/* abort (fast DISCONNECT, DETATCH) */
+					/* (only happens if LISTEN socket) */
+    case PRU_RCVD:			/* have taken data; more room now */
+    case PRU_FASTTIMO:			/* 200ms timeout */
+    case PRU_SLOWTIMO:			/* 500ms timeout */
+    case PRU_RCVOOB:			/* retrieve out of band data */
+    case PRU_SENDOOB:			/* send out of band data */
+    case PRU_PROTORCV:			/* receive from below */
+    case PRU_PROTOSEND:			/* send to below */
+    case PRU_SOCKADDR:			/* fetch socket's address */
+#ifdef DIAGNOSTIC
+      printf("natm: PRU #%d unsupported\n", req);
+#endif
+      error = EOPNOTSUPP;
+      break;
+   
+    default: panic("natm usrreq");
+  }
+
+done:
+  splx(s);
+  return(error);
+}
+
+#endif  /* !FREEBSD_USRREQS */
+
+/*
+ * natmintr: splsoftnet interrupt
+ *
+ * note: we expect a socket pointer in rcvif rather than an interface
+ * pointer.    we can get the interface pointer from the so's PCB if
+ * we really need it.
+ */
+
+void
+natmintr()
+
+{
+  int s;
+  struct mbuf *m;
+  struct socket *so;
+  struct natmpcb *npcb;
+
+next:
+  s = splimp();
+  IF_DEQUEUE(&natmintrq, m);
+  splx(s);
+  if (m == NULL)
+    return;
+
+#ifdef DIAGNOSTIC
+  if ((m->m_flags & M_PKTHDR) == 0)
+    panic("natmintr no HDR");
+#endif
+
+  npcb = (struct natmpcb *) m->m_pkthdr.rcvif; /* XXX: overloaded */
+  so = npcb->npcb_socket;
+
+  s = splimp();			/* could have atm devs @ different levels */
+  npcb->npcb_inq--;
+  splx(s);
+
+  if (npcb->npcb_flags & NPCB_DRAIN) {
+    m_freem(m);
+    if (npcb->npcb_inq == 0)
+      FREE(npcb, M_PCB);			/* done! */
+    goto next;
+  }
+
+  if (npcb->npcb_flags & NPCB_FREE) {
+    m_freem(m);					/* drop */
+    goto next;
+  }
+
+#ifdef NEED_TO_RESTORE_IFP
+  m->m_pkthdr.rcvif = npcb->npcb_ifp;
+#else
+#ifdef DIAGNOSTIC
+m->m_pkthdr.rcvif = NULL;	/* null it out to be safe */
+#endif
+#endif
+
+  if (sbspace(&so->so_rcv) > m->m_pkthdr.len ||
+     ((npcb->npcb_flags & NPCB_RAW) != 0 && so->so_rcv.sb_cc < NPCB_RAWCC) ) {
+#ifdef NATM_STAT
+    natm_sookcnt++;
+    natm_sookbytes += m->m_pkthdr.len;
+#endif
+    sbappendrecord(&so->so_rcv, m);
+    sorwakeup(so);
+  } else {
+#ifdef NATM_STAT
+    natm_sodropcnt++;
+    natm_sodropbytes += m->m_pkthdr.len;
+#endif
+    m_freem(m);
+  }
+
+  goto next;
+}
+
+#if defined(__FreeBSD__)
+NETISR_SET(NETISR_NATM, natmintr);
+#endif
+
+
+/* 
+ * natm0_sysctl: not used, but here in case we want to add something
+ * later...
+ */
+
+int natm0_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
+
+int *name;
+u_int namelen;
+void *oldp;
+size_t *oldlenp;
+void *newp;
+size_t newlen;
+
+{
+  /* All sysctl names at this level are terminal. */
+  if (namelen != 1)
+    return (ENOTDIR);
+  return (ENOPROTOOPT);
+}
+
+/* 
+ * natm5_sysctl: not used, but here in case we want to add something
+ * later...
+ */
+
+int natm5_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
+
+int *name;
+u_int namelen;
+void *oldp;
+size_t *oldlenp;
+void *newp;
+size_t newlen;
+
+{
+  /* All sysctl names at this level are terminal. */
+  if (namelen != 1)
+    return (ENOTDIR);
+  return (ENOPROTOOPT);
+}