1995-02-26 12:18:08 +00:00
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/* $NetBSD: if_tun.c,v 1.14 1994/06/29 06:36:25 cgd Exp $ */
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1995-01-31 06:15:49 +00:00
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/*
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* Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk>
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* Nottingham University 1987.
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*
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* This source may be freely distributed, however I would be interested
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* in any changes that are made.
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*
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* This driver takes packets off the IP i/f and hands them up to a
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* user process to have it's wicked way with. This driver has it's
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* roots in a similar driver written by Phil Cockcroft (formerly) at
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* UCL. This driver is based much more on read/write/select mode of
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* operation though.
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*/
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#include "tun.h"
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#if NTUN > 0
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1995-02-26 12:18:08 +00:00
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/buf.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/errno.h>
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#include <sys/syslog.h>
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#include <sys/select.h>
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1995-01-31 06:15:49 +00:00
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#include <sys/file.h>
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1995-03-16 18:17:34 +00:00
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#include <sys/signalvar.h>
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1995-02-26 12:18:08 +00:00
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#include <sys/kernel.h>
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1995-12-09 20:47:15 +00:00
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#include <sys/sysctl.h>
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1995-12-08 11:19:42 +00:00
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#ifdef DEVFS
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#include <sys/devfsext.h>
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#endif /*DEVFS*/
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1995-04-10 20:35:45 +00:00
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#include <sys/conf.h>
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1995-01-31 06:15:49 +00:00
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#include <machine/cpu.h>
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#include <net/if.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/if_ether.h>
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#endif
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#ifdef NS
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#include <netns/ns.h>
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#include <netns/ns_if.h>
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#endif
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#include "bpfilter.h"
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#if NBPFILTER > 0
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#include <sys/time.h>
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#include <net/bpf.h>
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#endif
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#include <net/if_tun.h>
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1995-09-09 18:10:37 +00:00
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static void tunattach __P((void *));
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1995-08-30 00:33:22 +00:00
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PSEUDO_SET(tunattach, if_tun);
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1995-11-29 10:49:16 +00:00
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1995-01-31 06:15:49 +00:00
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#define TUNDEBUG if (tundebug) printf
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1995-12-09 20:47:15 +00:00
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static int tundebug = 0;
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1996-02-09 09:23:56 +00:00
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SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, "");
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1995-01-31 06:15:49 +00:00
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1995-12-09 20:47:15 +00:00
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static struct tun_softc tunctl[NTUN];
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1995-01-31 06:15:49 +00:00
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1995-12-09 20:47:15 +00:00
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static int tunoutput __P((struct ifnet *, struct mbuf *, struct sockaddr *,
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1995-02-26 12:18:08 +00:00
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struct rtentry *rt));
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1995-12-09 20:47:15 +00:00
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static int tunifioctl __P((struct ifnet *, int, caddr_t));
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1995-12-08 11:19:42 +00:00
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static int tuninit __P((int));
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1995-01-31 06:15:49 +00:00
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1995-12-08 11:19:42 +00:00
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static d_open_t tunopen;
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static d_close_t tunclose;
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static d_read_t tunread;
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static d_write_t tunwrite;
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static d_ioctl_t tunioctl;
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static d_select_t tunselect;
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#define CDEV_MAJOR 52
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static struct cdevsw tun_cdevsw = {
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1995-11-06 00:36:19 +00:00
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tunopen, tunclose, tunread, tunwrite,
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tunioctl, nullstop, noreset, nodevtotty,
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1995-12-08 11:19:42 +00:00
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tunselect, nommap, nostrategy, "tun", NULL, -1
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1995-11-06 00:36:19 +00:00
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};
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1995-04-10 20:35:45 +00:00
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1995-12-08 11:19:42 +00:00
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static tun_devsw_installed = 0;
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#ifdef DEVFS
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static void *tun_devfs_token[NTUN];
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#endif
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1995-01-31 06:15:49 +00:00
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1995-08-30 00:33:22 +00:00
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static void
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1995-11-06 00:36:19 +00:00
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tunattach(dummy)
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void *dummy;
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1995-01-31 06:15:49 +00:00
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{
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register int i;
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struct ifnet *ifp;
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1995-12-08 11:19:42 +00:00
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dev_t dev;
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1995-01-31 06:15:49 +00:00
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1995-12-08 11:19:42 +00:00
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if( tun_devsw_installed ) return;
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dev = makedev(CDEV_MAJOR, 0);
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cdevsw_add(&dev,&tun_cdevsw, NULL);
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tun_devsw_installed = 1;
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for ( i = 0; i < NTUN; i++ ) {
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#ifdef DEVFS
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1996-03-27 20:03:32 +00:00
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tun_devfs_token[i] = devfs_add_devswf(&tun_cdevsw, i, DV_CHR,
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UID_UUCP, GID_DIALER,
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0600, "tun%d", i);
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1995-12-08 11:19:42 +00:00
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#endif
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1995-01-31 06:15:49 +00:00
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tunctl[i].tun_flags = TUN_INITED;
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ifp = &tunctl[i].tun_if;
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ifp->if_unit = i;
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ifp->if_name = "tun";
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ifp->if_mtu = TUNMTU;
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ifp->if_ioctl = tunifioctl;
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ifp->if_output = tunoutput;
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1995-09-25 16:57:54 +00:00
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ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
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1995-01-31 06:15:49 +00:00
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ifp->if_snd.ifq_maxlen = ifqmaxlen;
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ifp->if_collisions = 0;
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ifp->if_ierrors = 0;
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ifp->if_oerrors = 0;
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ifp->if_ipackets = 0;
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ifp->if_opackets = 0;
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if_attach(ifp);
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#if NBPFILTER > 0
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1996-02-06 18:51:28 +00:00
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bpfattach(ifp, DLT_NULL, sizeof(u_int));
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1995-01-31 06:15:49 +00:00
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#endif
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}
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}
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/*
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* tunnel open - must be superuser & the device must be
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* configured in
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*/
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1995-12-08 11:19:42 +00:00
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static int
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1995-01-31 06:15:49 +00:00
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tunopen(dev, flag, mode, p)
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dev_t dev;
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int flag, mode;
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struct proc *p;
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{
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struct ifnet *ifp;
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struct tun_softc *tp;
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register int unit, error;
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1995-12-09 20:47:15 +00:00
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error = suser(p->p_ucred, &p->p_acflag);
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if (error)
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1995-01-31 06:15:49 +00:00
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return (error);
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if ((unit = minor(dev)) >= NTUN)
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return (ENXIO);
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tp = &tunctl[unit];
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if (tp->tun_flags & TUN_OPEN)
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return ENXIO;
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ifp = &tp->tun_if;
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tp->tun_flags |= TUN_OPEN;
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TUNDEBUG("%s%d: open\n", ifp->if_name, ifp->if_unit);
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return (0);
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}
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/*
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* tunclose - close the device - mark i/f down & delete
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* routing info
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*/
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1995-12-08 11:19:42 +00:00
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static int
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1995-04-10 20:35:45 +00:00
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tunclose(dev_t dev, int foo, int bar, struct proc *p)
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1995-01-31 06:15:49 +00:00
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{
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register int unit = minor(dev), s;
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struct tun_softc *tp = &tunctl[unit];
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struct ifnet *ifp = &tp->tun_if;
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struct mbuf *m;
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tp->tun_flags &= ~TUN_OPEN;
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/*
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* junk all pending output
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*/
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do {
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s = splimp();
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IF_DEQUEUE(&ifp->if_snd, m);
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splx(s);
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if (m)
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m_freem(m);
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} while (m);
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if (ifp->if_flags & IFF_UP) {
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s = splimp();
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if_down(ifp);
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if (ifp->if_flags & IFF_RUNNING) {
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1995-02-26 12:18:08 +00:00
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/* find internet addresses and delete routes */
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register struct ifaddr *ifa;
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for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) {
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if (ifa->ifa_addr->sa_family == AF_INET) {
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rtinit(ifa, (int)RTM_DELETE,
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tp->tun_flags & TUN_DSTADDR ? RTF_HOST : 0);
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}
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}
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1995-01-31 06:15:49 +00:00
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}
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splx(s);
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}
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tp->tun_pgrp = 0;
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1995-02-26 12:18:08 +00:00
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selwakeup(&tp->tun_rsel);
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1995-05-30 08:16:23 +00:00
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1995-01-31 06:15:49 +00:00
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TUNDEBUG ("%s%d: closed\n", ifp->if_name, ifp->if_unit);
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return (0);
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}
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static int
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tuninit(unit)
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int unit;
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{
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struct tun_softc *tp = &tunctl[unit];
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struct ifnet *ifp = &tp->tun_if;
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register struct ifaddr *ifa;
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TUNDEBUG("%s%d: tuninit\n", ifp->if_name, ifp->if_unit);
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ifp->if_flags |= IFF_UP | IFF_RUNNING;
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1995-02-26 12:18:08 +00:00
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for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
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if (ifa->ifa_addr->sa_family == AF_INET) {
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struct sockaddr_in *si;
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1995-01-31 06:15:49 +00:00
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1995-02-26 12:18:08 +00:00
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si = (struct sockaddr_in *)ifa->ifa_addr;
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if (si && si->sin_addr.s_addr)
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tp->tun_flags |= TUN_IASET;
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1995-01-31 06:15:49 +00:00
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1995-02-26 12:18:08 +00:00
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si = (struct sockaddr_in *)ifa->ifa_dstaddr;
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if (si && si->sin_addr.s_addr)
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tp->tun_flags |= TUN_DSTADDR;
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}
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1995-01-31 06:15:49 +00:00
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return 0;
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}
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/*
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* Process an ioctl request.
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*/
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int
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tunifioctl(ifp, cmd, data)
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struct ifnet *ifp;
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int cmd;
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caddr_t data;
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{
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1995-09-25 16:57:54 +00:00
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register struct ifreq *ifr = (struct ifreq *)data;
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1995-01-31 06:15:49 +00:00
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int error = 0, s;
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s = splimp();
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switch(cmd) {
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case SIOCSIFADDR:
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tuninit(ifp->if_unit);
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1995-02-26 12:18:08 +00:00
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TUNDEBUG("%s%d: address set\n",
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ifp->if_name, ifp->if_unit);
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1995-01-31 06:15:49 +00:00
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break;
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case SIOCSIFDSTADDR:
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1995-02-26 12:18:08 +00:00
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tuninit(ifp->if_unit);
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TUNDEBUG("%s%d: destination address set\n",
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ifp->if_name, ifp->if_unit);
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1995-01-31 06:15:49 +00:00
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break;
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1995-09-25 16:57:54 +00:00
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case SIOCADDMULTI:
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case SIOCDELMULTI:
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if (ifr == 0) {
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error = EAFNOSUPPORT; /* XXX */
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break;
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}
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switch (ifr->ifr_addr.sa_family) {
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#ifdef INET
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case AF_INET:
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break;
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#endif
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default:
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error = EAFNOSUPPORT;
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break;
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}
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break;
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1995-01-31 06:15:49 +00:00
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default:
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error = EINVAL;
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}
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splx(s);
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return (error);
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}
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/*
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* tunoutput - queue packets from higher level ready to put out.
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*/
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int
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tunoutput(ifp, m0, dst, rt)
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struct ifnet *ifp;
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struct mbuf *m0;
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struct sockaddr *dst;
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struct rtentry *rt;
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{
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struct tun_softc *tp = &tunctl[ifp->if_unit];
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struct proc *p;
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int s;
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TUNDEBUG ("%s%d: tunoutput\n", ifp->if_name, ifp->if_unit);
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if ((tp->tun_flags & TUN_READY) != TUN_READY) {
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TUNDEBUG ("%s%d: not ready 0%o\n", ifp->if_name,
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ifp->if_unit, tp->tun_flags);
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m_freem (m0);
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return EHOSTDOWN;
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}
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#if NBPFILTER > 0
|
1995-09-25 16:57:54 +00:00
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/* BPF write needs to be handled specially */
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if (dst->sa_family == AF_UNSPEC) {
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dst->sa_family = *(mtod(m0, int *));
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m0->m_len -= sizeof(int);
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m0->m_pkthdr.len -= sizeof(int);
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m0->m_data += sizeof(int);
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}
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|
1996-02-06 18:51:28 +00:00
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|
if (ifp->if_bpf) {
|
1995-01-31 06:15:49 +00:00
|
|
|
/*
|
|
|
|
* 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 m;
|
|
|
|
u_int af = dst->sa_family;
|
|
|
|
|
|
|
|
m.m_next = m0;
|
|
|
|
m.m_len = 4;
|
|
|
|
m.m_data = (char *)⁡
|
|
|
|
|
1996-02-06 18:51:28 +00:00
|
|
|
bpf_mtap(ifp, &m);
|
1995-01-31 06:15:49 +00:00
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
switch(dst->sa_family) {
|
|
|
|
#ifdef INET
|
|
|
|
case AF_INET:
|
|
|
|
s = splimp();
|
|
|
|
if (IF_QFULL(&ifp->if_snd)) {
|
|
|
|
IF_DROP(&ifp->if_snd);
|
|
|
|
m_freem(m0);
|
|
|
|
splx(s);
|
|
|
|
ifp->if_collisions++;
|
|
|
|
return (ENOBUFS);
|
|
|
|
}
|
|
|
|
IF_ENQUEUE(&ifp->if_snd, m0);
|
|
|
|
splx(s);
|
|
|
|
ifp->if_opackets++;
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
default:
|
|
|
|
m_freem(m0);
|
|
|
|
return EAFNOSUPPORT;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (tp->tun_flags & TUN_RWAIT) {
|
|
|
|
tp->tun_flags &= ~TUN_RWAIT;
|
|
|
|
wakeup((caddr_t)tp);
|
|
|
|
}
|
|
|
|
if (tp->tun_flags & TUN_ASYNC && tp->tun_pgrp) {
|
|
|
|
if (tp->tun_pgrp > 0)
|
|
|
|
gsignal(tp->tun_pgrp, SIGIO);
|
1995-12-09 20:47:15 +00:00
|
|
|
else if ((p = pfind(-tp->tun_pgrp)) != 0)
|
1995-01-31 06:15:49 +00:00
|
|
|
psignal(p, SIGIO);
|
|
|
|
}
|
1995-02-26 12:18:08 +00:00
|
|
|
selwakeup(&tp->tun_rsel);
|
1995-01-31 06:15:49 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* the cdevsw interface is now pretty minimal.
|
|
|
|
*/
|
1995-12-08 11:19:42 +00:00
|
|
|
static int
|
1995-02-26 12:18:08 +00:00
|
|
|
tunioctl(dev, cmd, data, flag, p)
|
1995-01-31 06:15:49 +00:00
|
|
|
dev_t dev;
|
|
|
|
int cmd;
|
|
|
|
caddr_t data;
|
|
|
|
int flag;
|
1995-02-26 12:18:08 +00:00
|
|
|
struct proc *p;
|
1995-01-31 06:15:49 +00:00
|
|
|
{
|
|
|
|
int unit = minor(dev), s;
|
|
|
|
struct tun_softc *tp = &tunctl[unit];
|
1995-02-26 12:18:08 +00:00
|
|
|
struct tuninfo *tunp;
|
1995-01-31 06:15:49 +00:00
|
|
|
|
|
|
|
switch (cmd) {
|
1995-02-26 12:18:08 +00:00
|
|
|
case TUNSIFINFO:
|
|
|
|
tunp = (struct tuninfo *)data;
|
|
|
|
tp->tun_if.if_mtu = tunp->mtu;
|
|
|
|
tp->tun_if.if_type = tunp->type;
|
|
|
|
tp->tun_if.if_baudrate = tunp->baudrate;
|
|
|
|
break;
|
|
|
|
case TUNGIFINFO:
|
|
|
|
tunp = (struct tuninfo *)data;
|
|
|
|
tunp->mtu = tp->tun_if.if_mtu;
|
|
|
|
tunp->type = tp->tun_if.if_type;
|
|
|
|
tunp->baudrate = tp->tun_if.if_baudrate;
|
|
|
|
break;
|
1995-01-31 06:15:49 +00:00
|
|
|
case TUNSDEBUG:
|
|
|
|
tundebug = *(int *)data;
|
|
|
|
break;
|
|
|
|
case TUNGDEBUG:
|
|
|
|
*(int *)data = tundebug;
|
|
|
|
break;
|
|
|
|
case FIONBIO:
|
|
|
|
if (*(int *)data)
|
|
|
|
tp->tun_flags |= TUN_NBIO;
|
|
|
|
else
|
|
|
|
tp->tun_flags &= ~TUN_NBIO;
|
|
|
|
break;
|
|
|
|
case FIOASYNC:
|
|
|
|
if (*(int *)data)
|
|
|
|
tp->tun_flags |= TUN_ASYNC;
|
|
|
|
else
|
|
|
|
tp->tun_flags &= ~TUN_ASYNC;
|
|
|
|
break;
|
|
|
|
case FIONREAD:
|
|
|
|
s = splimp();
|
1995-12-11 13:24:58 +00:00
|
|
|
if (tp->tun_if.if_snd.ifq_head) {
|
|
|
|
struct mbuf *mb = tp->tun_if.if_snd.ifq_head;
|
|
|
|
for( *(int *)data = 0; mb != 0; mb = mb->m_next)
|
|
|
|
*(int *)data += mb->m_len;
|
|
|
|
} else
|
1995-01-31 06:15:49 +00:00
|
|
|
*(int *)data = 0;
|
|
|
|
splx(s);
|
|
|
|
break;
|
|
|
|
case TIOCSPGRP:
|
|
|
|
tp->tun_pgrp = *(int *)data;
|
|
|
|
break;
|
|
|
|
case TIOCGPGRP:
|
|
|
|
*(int *)data = tp->tun_pgrp;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return (ENOTTY);
|
|
|
|
}
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The cdevsw read interface - reads a packet at a time, or at
|
|
|
|
* least as much of a packet as can be read.
|
|
|
|
*/
|
1995-12-08 11:19:42 +00:00
|
|
|
static int
|
1995-04-10 20:35:45 +00:00
|
|
|
tunread(dev_t dev, struct uio *uio, int flag)
|
1995-01-31 06:15:49 +00:00
|
|
|
{
|
|
|
|
int unit = minor(dev);
|
|
|
|
struct tun_softc *tp = &tunctl[unit];
|
|
|
|
struct ifnet *ifp = &tp->tun_if;
|
|
|
|
struct mbuf *m, *m0;
|
|
|
|
int error=0, len, s;
|
|
|
|
|
|
|
|
TUNDEBUG ("%s%d: read\n", ifp->if_name, ifp->if_unit);
|
|
|
|
if ((tp->tun_flags & TUN_READY) != TUN_READY) {
|
|
|
|
TUNDEBUG ("%s%d: not ready 0%o\n", ifp->if_name,
|
|
|
|
ifp->if_unit, tp->tun_flags);
|
|
|
|
return EHOSTDOWN;
|
|
|
|
}
|
|
|
|
|
|
|
|
tp->tun_flags &= ~TUN_RWAIT;
|
|
|
|
|
|
|
|
s = splimp();
|
|
|
|
do {
|
|
|
|
IF_DEQUEUE(&ifp->if_snd, m0);
|
|
|
|
if (m0 == 0) {
|
|
|
|
if (tp->tun_flags & TUN_NBIO) {
|
|
|
|
splx(s);
|
|
|
|
return EWOULDBLOCK;
|
|
|
|
}
|
|
|
|
tp->tun_flags |= TUN_RWAIT;
|
|
|
|
tsleep((caddr_t)tp, PZERO + 1, "tunread", 0);
|
|
|
|
}
|
|
|
|
} while (m0 == 0);
|
|
|
|
splx(s);
|
|
|
|
|
|
|
|
while (m0 && uio->uio_resid > 0 && error == 0) {
|
1995-02-26 12:18:08 +00:00
|
|
|
len = min(uio->uio_resid, m0->m_len);
|
1995-01-31 06:15:49 +00:00
|
|
|
if (len == 0)
|
|
|
|
break;
|
|
|
|
error = uiomove(mtod(m0, caddr_t), len, uio);
|
|
|
|
MFREE(m0, m);
|
|
|
|
m0 = m;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (m0) {
|
|
|
|
TUNDEBUG("Dropping mbuf\n");
|
|
|
|
m_freem(m0);
|
|
|
|
}
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* the cdevsw write interface - an atomic write is a packet - or else!
|
|
|
|
*/
|
1995-12-08 11:19:42 +00:00
|
|
|
static int
|
1995-04-10 20:35:45 +00:00
|
|
|
tunwrite(dev_t dev, struct uio *uio, int flag)
|
1995-01-31 06:15:49 +00:00
|
|
|
{
|
|
|
|
int unit = minor (dev);
|
|
|
|
struct ifnet *ifp = &tunctl[unit].tun_if;
|
|
|
|
struct mbuf *top, **mp, *m;
|
|
|
|
int error=0, s, tlen, mlen;
|
|
|
|
|
|
|
|
TUNDEBUG("%s%d: tunwrite\n", ifp->if_name, ifp->if_unit);
|
|
|
|
|
|
|
|
if (uio->uio_resid < 0 || uio->uio_resid > TUNMTU) {
|
|
|
|
TUNDEBUG("%s%d: len=%d!\n", ifp->if_name, ifp->if_unit,
|
|
|
|
uio->uio_resid);
|
|
|
|
return EIO;
|
|
|
|
}
|
|
|
|
tlen = uio->uio_resid;
|
|
|
|
|
|
|
|
/* get a header mbuf */
|
|
|
|
MGETHDR(m, M_DONTWAIT, MT_DATA);
|
|
|
|
if (m == NULL)
|
|
|
|
return ENOBUFS;
|
|
|
|
mlen = MHLEN;
|
|
|
|
|
|
|
|
top = 0;
|
|
|
|
mp = ⊤
|
|
|
|
while (error == 0 && uio->uio_resid > 0) {
|
1995-02-26 12:18:08 +00:00
|
|
|
m->m_len = min(mlen, uio->uio_resid);
|
1995-01-31 06:15:49 +00:00
|
|
|
error = uiomove(mtod (m, caddr_t), m->m_len, uio);
|
|
|
|
*mp = m;
|
|
|
|
mp = &m->m_next;
|
|
|
|
if (uio->uio_resid > 0) {
|
|
|
|
MGET (m, M_DONTWAIT, MT_DATA);
|
|
|
|
if (m == 0) {
|
|
|
|
error = ENOBUFS;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
mlen = MLEN;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (error) {
|
|
|
|
if (top)
|
|
|
|
m_freem (top);
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
top->m_pkthdr.len = tlen;
|
|
|
|
top->m_pkthdr.rcvif = ifp;
|
|
|
|
|
|
|
|
#if NBPFILTER > 0
|
1996-02-06 18:51:28 +00:00
|
|
|
if (ifp->if_bpf) {
|
1995-01-31 06:15:49 +00:00
|
|
|
/*
|
|
|
|
* 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 m;
|
|
|
|
u_int af = AF_INET;
|
|
|
|
|
|
|
|
m.m_next = top;
|
|
|
|
m.m_len = 4;
|
|
|
|
m.m_data = (char *)⁡
|
|
|
|
|
1996-02-06 18:51:28 +00:00
|
|
|
bpf_mtap(ifp, &m);
|
1995-01-31 06:15:49 +00:00
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
s = splimp();
|
|
|
|
if (IF_QFULL (&ipintrq)) {
|
|
|
|
IF_DROP(&ipintrq);
|
|
|
|
splx(s);
|
|
|
|
ifp->if_collisions++;
|
|
|
|
m_freem(top);
|
|
|
|
return ENOBUFS;
|
|
|
|
}
|
|
|
|
IF_ENQUEUE(&ipintrq, top);
|
|
|
|
splx(s);
|
|
|
|
ifp->if_ipackets++;
|
|
|
|
schednetisr(NETISR_IP);
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* tunselect - the select interface, this is only useful on reads
|
|
|
|
* really. The write detect always returns true, write never blocks
|
|
|
|
* anyway, it either accepts the packet or drops it.
|
|
|
|
*/
|
1995-12-08 11:19:42 +00:00
|
|
|
static int
|
1995-04-10 20:35:45 +00:00
|
|
|
tunselect(dev_t dev, int rw, struct proc *p)
|
1995-01-31 06:15:49 +00:00
|
|
|
{
|
|
|
|
int unit = minor(dev), s;
|
|
|
|
struct tun_softc *tp = &tunctl[unit];
|
|
|
|
struct ifnet *ifp = &tp->tun_if;
|
|
|
|
|
|
|
|
s = splimp();
|
|
|
|
TUNDEBUG("%s%d: tunselect\n", ifp->if_name, ifp->if_unit);
|
1995-02-26 12:18:08 +00:00
|
|
|
|
1995-01-31 06:15:49 +00:00
|
|
|
switch (rw) {
|
|
|
|
case FREAD:
|
|
|
|
if (ifp->if_snd.ifq_len > 0) {
|
|
|
|
splx(s);
|
|
|
|
TUNDEBUG("%s%d: tunselect q=%d\n", ifp->if_name,
|
|
|
|
ifp->if_unit, ifp->if_snd.ifq_len);
|
|
|
|
return 1;
|
|
|
|
}
|
1995-04-10 20:35:45 +00:00
|
|
|
selrecord(p, &tp->tun_rsel);
|
1995-01-31 06:15:49 +00:00
|
|
|
break;
|
|
|
|
case FWRITE:
|
|
|
|
splx(s);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
splx(s);
|
|
|
|
TUNDEBUG("%s%d: tunselect waiting\n", ifp->if_name, ifp->if_unit);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
1995-11-29 10:49:16 +00:00
|
|
|
|
1995-01-31 06:15:49 +00:00
|
|
|
#endif /* NTUN */
|