75ae257016
to the mbuf. Offset cannot exceed MHLEN bytes. This is currently used to fix Ethernet header alignment problem on alpha and sparc64. Also change all users of m_uiotombuf to pass proper offset. Reviewed by: jmg, sam Tested by: Sten Spans "sten AT blinkenlights DOT nl" MFC after: 1 week
887 lines
19 KiB
C
887 lines
19 KiB
C
/*-
|
|
* Copyright (C) 1999-2000 by Maksim Yevmenkin <m_evmenkin@yahoo.com>
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
|
|
*
|
|
* BASED ON:
|
|
* -------------------------------------------------------------------------
|
|
*
|
|
* Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk>
|
|
* Nottingham University 1987.
|
|
*/
|
|
|
|
/*
|
|
* $FreeBSD$
|
|
* $Id: if_tap.c,v 0.21 2000/07/23 21:46:02 max Exp $
|
|
*/
|
|
|
|
#include "opt_inet.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/filio.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/module.h>
|
|
#include <sys/poll.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/selinfo.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/sockio.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/ttycom.h>
|
|
#include <sys/uio.h>
|
|
#include <sys/queue.h>
|
|
|
|
#include <net/bpf.h>
|
|
#include <net/ethernet.h>
|
|
#include <net/if.h>
|
|
#include <net/if_arp.h>
|
|
#include <net/route.h>
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <net/if_tapvar.h>
|
|
#include <net/if_tap.h>
|
|
|
|
|
|
#define CDEV_NAME "tap"
|
|
#define TAPDEBUG if (tapdebug) printf
|
|
|
|
#define TAP "tap"
|
|
#define VMNET "vmnet"
|
|
#define TAPMAXUNIT 0x7fff
|
|
#define VMNET_DEV_MASK CLONE_FLAG0
|
|
|
|
/* module */
|
|
static int tapmodevent(module_t, int, void *);
|
|
|
|
/* device */
|
|
static void tapclone(void *, char *, int, struct cdev **);
|
|
static void tapcreate(struct cdev *);
|
|
|
|
/* network interface */
|
|
static void tapifstart(struct ifnet *);
|
|
static int tapifioctl(struct ifnet *, u_long, caddr_t);
|
|
static void tapifinit(void *);
|
|
|
|
/* character device */
|
|
static d_open_t tapopen;
|
|
static d_close_t tapclose;
|
|
static d_read_t tapread;
|
|
static d_write_t tapwrite;
|
|
static d_ioctl_t tapioctl;
|
|
static d_poll_t tappoll;
|
|
|
|
static struct cdevsw tap_cdevsw = {
|
|
.d_version = D_VERSION,
|
|
.d_flags = D_PSEUDO | D_NEEDGIANT,
|
|
.d_open = tapopen,
|
|
.d_close = tapclose,
|
|
.d_read = tapread,
|
|
.d_write = tapwrite,
|
|
.d_ioctl = tapioctl,
|
|
.d_poll = tappoll,
|
|
.d_name = CDEV_NAME,
|
|
};
|
|
|
|
/*
|
|
* All global variables in if_tap.c are locked with tapmtx, with the
|
|
* exception of tapdebug, which is accessed unlocked; tapclones is
|
|
* static at runtime.
|
|
*/
|
|
static struct mtx tapmtx;
|
|
static int tapdebug = 0; /* debug flag */
|
|
static int tapuopen = 0; /* allow user open() */
|
|
static SLIST_HEAD(, tap_softc) taphead; /* first device */
|
|
static struct clonedevs *tapclones;
|
|
|
|
MALLOC_DECLARE(M_TAP);
|
|
MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface");
|
|
SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, "");
|
|
|
|
SYSCTL_DECL(_net_link);
|
|
SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0,
|
|
"Ethernet tunnel software network interface");
|
|
SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0,
|
|
"Allow user to open /dev/tap (based on node permissions)");
|
|
SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, "");
|
|
|
|
DEV_MODULE(if_tap, tapmodevent, NULL);
|
|
|
|
/*
|
|
* tapmodevent
|
|
*
|
|
* module event handler
|
|
*/
|
|
static int
|
|
tapmodevent(mod, type, data)
|
|
module_t mod;
|
|
int type;
|
|
void *data;
|
|
{
|
|
static eventhandler_tag eh_tag = NULL;
|
|
struct tap_softc *tp = NULL;
|
|
struct ifnet *ifp = NULL;
|
|
int s;
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
|
|
/* intitialize device */
|
|
|
|
mtx_init(&tapmtx, "tapmtx", NULL, MTX_DEF);
|
|
SLIST_INIT(&taphead);
|
|
|
|
clone_setup(&tapclones);
|
|
eh_tag = EVENTHANDLER_REGISTER(dev_clone, tapclone, 0, 1000);
|
|
if (eh_tag == NULL) {
|
|
clone_cleanup(&tapclones);
|
|
mtx_destroy(&tapmtx);
|
|
return (ENOMEM);
|
|
}
|
|
return (0);
|
|
|
|
case MOD_UNLOAD:
|
|
/*
|
|
* The EBUSY algorithm here can't quite atomically
|
|
* guarantee that this is race-free since we have to
|
|
* release the tap mtx to deregister the clone handler.
|
|
*/
|
|
mtx_lock(&tapmtx);
|
|
SLIST_FOREACH(tp, &taphead, tap_next) {
|
|
mtx_lock(&tp->tap_mtx);
|
|
if (tp->tap_flags & TAP_OPEN) {
|
|
mtx_unlock(&tp->tap_mtx);
|
|
mtx_unlock(&tapmtx);
|
|
return (EBUSY);
|
|
}
|
|
mtx_unlock(&tp->tap_mtx);
|
|
}
|
|
mtx_unlock(&tapmtx);
|
|
|
|
EVENTHANDLER_DEREGISTER(dev_clone, eh_tag);
|
|
|
|
mtx_lock(&tapmtx);
|
|
while ((tp = SLIST_FIRST(&taphead)) != NULL) {
|
|
SLIST_REMOVE_HEAD(&taphead, tap_next);
|
|
mtx_unlock(&tapmtx);
|
|
|
|
ifp = &tp->tap_if;
|
|
|
|
TAPDEBUG("detaching %s\n", ifp->if_xname);
|
|
|
|
/* Unlocked read. */
|
|
KASSERT(!(tp->tap_flags & TAP_OPEN),
|
|
("%s flags is out of sync", ifp->if_xname));
|
|
|
|
destroy_dev(tp->tap_dev);
|
|
s = splimp();
|
|
ether_ifdetach(ifp);
|
|
splx(s);
|
|
|
|
mtx_destroy(&tp->tap_mtx);
|
|
free(tp, M_TAP);
|
|
mtx_lock(&tapmtx);
|
|
}
|
|
mtx_unlock(&tapmtx);
|
|
clone_cleanup(&tapclones);
|
|
|
|
mtx_destroy(&tapmtx);
|
|
|
|
break;
|
|
|
|
default:
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
return (0);
|
|
} /* tapmodevent */
|
|
|
|
|
|
/*
|
|
* DEVFS handler
|
|
*
|
|
* We need to support two kind of devices - tap and vmnet
|
|
*/
|
|
static void
|
|
tapclone(arg, name, namelen, dev)
|
|
void *arg;
|
|
char *name;
|
|
int namelen;
|
|
struct cdev **dev;
|
|
{
|
|
u_int extra;
|
|
int i, unit;
|
|
char *device_name = name;
|
|
|
|
if (*dev != NULL)
|
|
return;
|
|
|
|
device_name = TAP;
|
|
extra = 0;
|
|
if (strcmp(name, TAP) == 0) {
|
|
unit = -1;
|
|
} else if (strcmp(name, VMNET) == 0) {
|
|
device_name = VMNET;
|
|
extra = VMNET_DEV_MASK;
|
|
unit = -1;
|
|
} else if (dev_stdclone(name, NULL, device_name, &unit) != 1) {
|
|
device_name = VMNET;
|
|
extra = VMNET_DEV_MASK;
|
|
if (dev_stdclone(name, NULL, device_name, &unit) != 1)
|
|
return;
|
|
}
|
|
|
|
/* find any existing device, or allocate new unit number */
|
|
i = clone_create(&tapclones, &tap_cdevsw, &unit, dev, extra);
|
|
if (i) {
|
|
*dev = make_dev(&tap_cdevsw, unit2minor(unit | extra),
|
|
UID_ROOT, GID_WHEEL, 0600, "%s%d", device_name, unit);
|
|
if (*dev != NULL) {
|
|
dev_ref(*dev);
|
|
(*dev)->si_flags |= SI_CHEAPCLONE;
|
|
}
|
|
}
|
|
} /* tapclone */
|
|
|
|
|
|
/*
|
|
* tapcreate
|
|
*
|
|
* to create interface
|
|
*/
|
|
static void
|
|
tapcreate(dev)
|
|
struct cdev *dev;
|
|
{
|
|
struct ifnet *ifp = NULL;
|
|
struct tap_softc *tp = NULL;
|
|
unsigned short macaddr_hi;
|
|
int unit, s;
|
|
char *name = NULL;
|
|
|
|
dev->si_flags &= ~SI_CHEAPCLONE;
|
|
|
|
/* allocate driver storage and create device */
|
|
MALLOC(tp, struct tap_softc *, sizeof(*tp), M_TAP, M_WAITOK | M_ZERO);
|
|
mtx_init(&tp->tap_mtx, "tap_mtx", NULL, MTX_DEF);
|
|
mtx_lock(&tapmtx);
|
|
SLIST_INSERT_HEAD(&taphead, tp, tap_next);
|
|
mtx_unlock(&tapmtx);
|
|
|
|
unit = dev2unit(dev);
|
|
|
|
/* select device: tap or vmnet */
|
|
if (unit & VMNET_DEV_MASK) {
|
|
name = VMNET;
|
|
tp->tap_flags |= TAP_VMNET;
|
|
} else
|
|
name = TAP;
|
|
|
|
unit &= TAPMAXUNIT;
|
|
|
|
TAPDEBUG("tapcreate(%s%d). minor = %#x\n", name, unit, minor(dev));
|
|
|
|
/* generate fake MAC address: 00 bd xx xx xx unit_no */
|
|
macaddr_hi = htons(0x00bd);
|
|
bcopy(&macaddr_hi, &tp->arpcom.ac_enaddr[0], sizeof(short));
|
|
bcopy(&ticks, &tp->arpcom.ac_enaddr[2], sizeof(long));
|
|
tp->arpcom.ac_enaddr[5] = (u_char)unit;
|
|
|
|
/* fill the rest and attach interface */
|
|
ifp = &tp->tap_if;
|
|
ifp->if_softc = tp;
|
|
if_initname(ifp, name, unit);
|
|
ifp->if_init = tapifinit;
|
|
ifp->if_start = tapifstart;
|
|
ifp->if_ioctl = tapifioctl;
|
|
ifp->if_mtu = ETHERMTU;
|
|
ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST);
|
|
ifp->if_snd.ifq_maxlen = ifqmaxlen;
|
|
|
|
dev->si_drv1 = tp;
|
|
tp->tap_dev = dev;
|
|
|
|
s = splimp();
|
|
ether_ifattach(ifp, tp->arpcom.ac_enaddr);
|
|
splx(s);
|
|
|
|
mtx_lock(&tp->tap_mtx);
|
|
tp->tap_flags |= TAP_INITED;
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
TAPDEBUG("interface %s is created. minor = %#x\n",
|
|
ifp->if_xname, minor(dev));
|
|
} /* tapcreate */
|
|
|
|
|
|
/*
|
|
* tapopen
|
|
*
|
|
* to open tunnel. must be superuser
|
|
*/
|
|
static int
|
|
tapopen(dev, flag, mode, td)
|
|
struct cdev *dev;
|
|
int flag;
|
|
int mode;
|
|
struct thread *td;
|
|
{
|
|
struct tap_softc *tp = NULL;
|
|
struct ifnet *ifp = NULL;
|
|
int s;
|
|
|
|
if (tapuopen == 0 && suser(td) != 0)
|
|
return (EPERM);
|
|
|
|
if ((dev2unit(dev) & CLONE_UNITMASK) > TAPMAXUNIT)
|
|
return (ENXIO);
|
|
|
|
/*
|
|
* XXXRW: Non-atomic test-and-set of si_drv1. Currently protected
|
|
* by Giant, but the race actually exists under memory pressure as
|
|
* well even when running with Giant, as malloc() may sleep.
|
|
*/
|
|
tp = dev->si_drv1;
|
|
if (tp == NULL) {
|
|
tapcreate(dev);
|
|
tp = dev->si_drv1;
|
|
}
|
|
|
|
mtx_lock(&tp->tap_mtx);
|
|
if (tp->tap_flags & TAP_OPEN) {
|
|
mtx_unlock(&tp->tap_mtx);
|
|
return (EBUSY);
|
|
}
|
|
|
|
bcopy(tp->arpcom.ac_enaddr, tp->ether_addr, sizeof(tp->ether_addr));
|
|
tp->tap_pid = td->td_proc->p_pid;
|
|
tp->tap_flags |= TAP_OPEN;
|
|
ifp = &tp->tap_if;
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
s = splimp();
|
|
ifp->if_flags |= IFF_RUNNING;
|
|
ifp->if_flags &= ~IFF_OACTIVE;
|
|
splx(s);
|
|
|
|
TAPDEBUG("%s is open. minor = %#x\n", ifp->if_xname, minor(dev));
|
|
|
|
return (0);
|
|
} /* tapopen */
|
|
|
|
|
|
/*
|
|
* tapclose
|
|
*
|
|
* close the device - mark i/f down & delete routing info
|
|
*/
|
|
static int
|
|
tapclose(dev, foo, bar, td)
|
|
struct cdev *dev;
|
|
int foo;
|
|
int bar;
|
|
struct thread *td;
|
|
{
|
|
struct tap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = &tp->tap_if;
|
|
int s;
|
|
|
|
/* junk all pending output */
|
|
IF_DRAIN(&ifp->if_snd);
|
|
|
|
/*
|
|
* do not bring the interface down, and do not anything with
|
|
* interface, if we are in VMnet mode. just close the device.
|
|
*/
|
|
|
|
mtx_lock(&tp->tap_mtx);
|
|
if (((tp->tap_flags & TAP_VMNET) == 0) && (ifp->if_flags & IFF_UP)) {
|
|
mtx_unlock(&tp->tap_mtx);
|
|
s = splimp();
|
|
if_down(ifp);
|
|
if (ifp->if_flags & IFF_RUNNING) {
|
|
/* find internet addresses and delete routes */
|
|
struct ifaddr *ifa = NULL;
|
|
|
|
/* In desparate need of ifaddr locking. */
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
if (ifa->ifa_addr->sa_family == AF_INET) {
|
|
rtinit(ifa, (int)RTM_DELETE, 0);
|
|
|
|
/* remove address from interface */
|
|
bzero(ifa->ifa_addr,
|
|
sizeof(*(ifa->ifa_addr)));
|
|
bzero(ifa->ifa_dstaddr,
|
|
sizeof(*(ifa->ifa_dstaddr)));
|
|
bzero(ifa->ifa_netmask,
|
|
sizeof(*(ifa->ifa_netmask)));
|
|
}
|
|
}
|
|
|
|
ifp->if_flags &= ~IFF_RUNNING;
|
|
}
|
|
splx(s);
|
|
} else
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
funsetown(&tp->tap_sigio);
|
|
selwakeuppri(&tp->tap_rsel, PZERO+1);
|
|
|
|
mtx_lock(&tp->tap_mtx);
|
|
tp->tap_flags &= ~TAP_OPEN;
|
|
tp->tap_pid = 0;
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
TAPDEBUG("%s is closed. minor = %#x\n",
|
|
ifp->if_xname, minor(dev));
|
|
|
|
return (0);
|
|
} /* tapclose */
|
|
|
|
|
|
/*
|
|
* tapifinit
|
|
*
|
|
* network interface initialization function
|
|
*/
|
|
static void
|
|
tapifinit(xtp)
|
|
void *xtp;
|
|
{
|
|
struct tap_softc *tp = (struct tap_softc *)xtp;
|
|
struct ifnet *ifp = &tp->tap_if;
|
|
|
|
TAPDEBUG("initializing %s\n", ifp->if_xname);
|
|
|
|
ifp->if_flags |= IFF_RUNNING;
|
|
ifp->if_flags &= ~IFF_OACTIVE;
|
|
|
|
/* attempt to start output */
|
|
tapifstart(ifp);
|
|
} /* tapifinit */
|
|
|
|
|
|
/*
|
|
* tapifioctl
|
|
*
|
|
* Process an ioctl request on network interface
|
|
*/
|
|
static int
|
|
tapifioctl(ifp, cmd, data)
|
|
struct ifnet *ifp;
|
|
u_long cmd;
|
|
caddr_t data;
|
|
{
|
|
struct tap_softc *tp = (struct tap_softc *)(ifp->if_softc);
|
|
struct ifstat *ifs = NULL;
|
|
int s, dummy;
|
|
|
|
switch (cmd) {
|
|
case SIOCSIFFLAGS: /* XXX -- just like vmnet does */
|
|
case SIOCADDMULTI:
|
|
case SIOCDELMULTI:
|
|
break;
|
|
|
|
case SIOCGIFSTATUS:
|
|
s = splimp();
|
|
ifs = (struct ifstat *)data;
|
|
dummy = strlen(ifs->ascii);
|
|
mtx_lock(&tp->tap_mtx);
|
|
if (tp->tap_pid != 0 && dummy < sizeof(ifs->ascii))
|
|
snprintf(ifs->ascii + dummy,
|
|
sizeof(ifs->ascii) - dummy,
|
|
"\tOpened by PID %d\n", tp->tap_pid);
|
|
mtx_unlock(&tp->tap_mtx);
|
|
splx(s);
|
|
break;
|
|
|
|
default:
|
|
s = splimp();
|
|
dummy = ether_ioctl(ifp, cmd, data);
|
|
splx(s);
|
|
return (dummy);
|
|
}
|
|
|
|
return (0);
|
|
} /* tapifioctl */
|
|
|
|
|
|
/*
|
|
* tapifstart
|
|
*
|
|
* queue packets from higher level ready to put out
|
|
*/
|
|
static void
|
|
tapifstart(ifp)
|
|
struct ifnet *ifp;
|
|
{
|
|
struct tap_softc *tp = ifp->if_softc;
|
|
int s;
|
|
|
|
TAPDEBUG("%s starting\n", ifp->if_xname);
|
|
|
|
/*
|
|
* do not junk pending output if we are in VMnet mode.
|
|
* XXX: can this do any harm because of queue overflow?
|
|
*/
|
|
|
|
mtx_lock(&tp->tap_mtx);
|
|
if (((tp->tap_flags & TAP_VMNET) == 0) &&
|
|
((tp->tap_flags & TAP_READY) != TAP_READY)) {
|
|
struct mbuf *m = NULL;
|
|
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
/* Unlocked read. */
|
|
TAPDEBUG("%s not ready, tap_flags = 0x%x\n", ifp->if_xname,
|
|
tp->tap_flags);
|
|
|
|
s = splimp();
|
|
do {
|
|
IF_DEQUEUE(&ifp->if_snd, m);
|
|
if (m != NULL)
|
|
m_freem(m);
|
|
ifp->if_oerrors ++;
|
|
} while (m != NULL);
|
|
splx(s);
|
|
|
|
return;
|
|
}
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
s = splimp();
|
|
ifp->if_flags |= IFF_OACTIVE;
|
|
|
|
if (ifp->if_snd.ifq_len != 0) {
|
|
mtx_lock(&tp->tap_mtx);
|
|
if (tp->tap_flags & TAP_RWAIT) {
|
|
tp->tap_flags &= ~TAP_RWAIT;
|
|
wakeup(tp);
|
|
}
|
|
|
|
if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) {
|
|
mtx_unlock(&tp->tap_mtx);
|
|
pgsigio(&tp->tap_sigio, SIGIO, 0);
|
|
} else
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
selwakeuppri(&tp->tap_rsel, PZERO+1);
|
|
ifp->if_opackets ++; /* obytes are counted in ether_output */
|
|
}
|
|
|
|
ifp->if_flags &= ~IFF_OACTIVE;
|
|
splx(s);
|
|
} /* tapifstart */
|
|
|
|
|
|
/*
|
|
* tapioctl
|
|
*
|
|
* the cdevsw interface is now pretty minimal
|
|
*/
|
|
static int
|
|
tapioctl(dev, cmd, data, flag, td)
|
|
struct cdev *dev;
|
|
u_long cmd;
|
|
caddr_t data;
|
|
int flag;
|
|
struct thread *td;
|
|
{
|
|
struct tap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = &tp->tap_if;
|
|
struct tapinfo *tapp = NULL;
|
|
int s;
|
|
int f;
|
|
|
|
switch (cmd) {
|
|
case TAPSIFINFO:
|
|
s = splimp();
|
|
tapp = (struct tapinfo *)data;
|
|
ifp->if_mtu = tapp->mtu;
|
|
ifp->if_type = tapp->type;
|
|
ifp->if_baudrate = tapp->baudrate;
|
|
splx(s);
|
|
break;
|
|
|
|
case TAPGIFINFO:
|
|
tapp = (struct tapinfo *)data;
|
|
tapp->mtu = ifp->if_mtu;
|
|
tapp->type = ifp->if_type;
|
|
tapp->baudrate = ifp->if_baudrate;
|
|
break;
|
|
|
|
case TAPSDEBUG:
|
|
tapdebug = *(int *)data;
|
|
break;
|
|
|
|
case TAPGDEBUG:
|
|
*(int *)data = tapdebug;
|
|
break;
|
|
|
|
case FIONBIO:
|
|
break;
|
|
|
|
case FIOASYNC:
|
|
s = splimp();
|
|
mtx_lock(&tp->tap_mtx);
|
|
if (*(int *)data)
|
|
tp->tap_flags |= TAP_ASYNC;
|
|
else
|
|
tp->tap_flags &= ~TAP_ASYNC;
|
|
mtx_unlock(&tp->tap_mtx);
|
|
splx(s);
|
|
break;
|
|
|
|
case FIONREAD:
|
|
s = splimp();
|
|
if (ifp->if_snd.ifq_head) {
|
|
struct mbuf *mb = ifp->if_snd.ifq_head;
|
|
|
|
for(*(int *)data = 0;mb != NULL;mb = mb->m_next)
|
|
*(int *)data += mb->m_len;
|
|
} else
|
|
*(int *)data = 0;
|
|
splx(s);
|
|
break;
|
|
|
|
case FIOSETOWN:
|
|
return (fsetown(*(int *)data, &tp->tap_sigio));
|
|
|
|
case FIOGETOWN:
|
|
*(int *)data = fgetown(&tp->tap_sigio);
|
|
return (0);
|
|
|
|
/* this is deprecated, FIOSETOWN should be used instead */
|
|
case TIOCSPGRP:
|
|
return (fsetown(-(*(int *)data), &tp->tap_sigio));
|
|
|
|
/* this is deprecated, FIOGETOWN should be used instead */
|
|
case TIOCGPGRP:
|
|
*(int *)data = -fgetown(&tp->tap_sigio);
|
|
return (0);
|
|
|
|
/* VMware/VMnet port ioctl's */
|
|
|
|
case SIOCGIFFLAGS: /* get ifnet flags */
|
|
bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags));
|
|
break;
|
|
|
|
case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */
|
|
f = *(int *)data;
|
|
f &= 0x0fff;
|
|
f &= ~IFF_CANTCHANGE;
|
|
f |= IFF_UP;
|
|
|
|
s = splimp();
|
|
ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE);
|
|
splx(s);
|
|
break;
|
|
|
|
case OSIOCGIFADDR: /* get MAC address of the remote side */
|
|
case SIOCGIFADDR:
|
|
mtx_lock(&tp->tap_mtx);
|
|
bcopy(tp->ether_addr, data, sizeof(tp->ether_addr));
|
|
mtx_unlock(&tp->tap_mtx);
|
|
break;
|
|
|
|
case SIOCSIFADDR: /* set MAC address of the remote side */
|
|
mtx_lock(&tp->tap_mtx);
|
|
bcopy(data, tp->ether_addr, sizeof(tp->ether_addr));
|
|
mtx_unlock(&tp->tap_mtx);
|
|
break;
|
|
|
|
default:
|
|
return (ENOTTY);
|
|
}
|
|
return (0);
|
|
} /* tapioctl */
|
|
|
|
|
|
/*
|
|
* tapread
|
|
*
|
|
* the cdevsw read interface - reads a packet at a time, or at
|
|
* least as much of a packet as can be read
|
|
*/
|
|
static int
|
|
tapread(dev, uio, flag)
|
|
struct cdev *dev;
|
|
struct uio *uio;
|
|
int flag;
|
|
{
|
|
struct tap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = &tp->tap_if;
|
|
struct mbuf *m = NULL;
|
|
int error = 0, len, s;
|
|
|
|
TAPDEBUG("%s reading, minor = %#x\n", ifp->if_xname, minor(dev));
|
|
|
|
mtx_lock(&tp->tap_mtx);
|
|
if ((tp->tap_flags & TAP_READY) != TAP_READY) {
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
/* Unlocked read. */
|
|
TAPDEBUG("%s not ready. minor = %#x, tap_flags = 0x%x\n",
|
|
ifp->if_xname, minor(dev), tp->tap_flags);
|
|
|
|
return (EHOSTDOWN);
|
|
}
|
|
|
|
tp->tap_flags &= ~TAP_RWAIT;
|
|
mtx_unlock(&tp->tap_mtx);
|
|
|
|
/* sleep until we get a packet */
|
|
do {
|
|
s = splimp();
|
|
IF_DEQUEUE(&ifp->if_snd, m);
|
|
splx(s);
|
|
|
|
if (m == NULL) {
|
|
if (flag & O_NONBLOCK)
|
|
return (EWOULDBLOCK);
|
|
|
|
mtx_lock(&tp->tap_mtx);
|
|
tp->tap_flags |= TAP_RWAIT;
|
|
mtx_unlock(&tp->tap_mtx);
|
|
error = tsleep(tp,PCATCH|(PZERO+1),"taprd",0);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
} while (m == NULL);
|
|
|
|
/* feed packet to bpf */
|
|
BPF_MTAP(ifp, m);
|
|
|
|
/* xfer packet to user space */
|
|
while ((m != NULL) && (uio->uio_resid > 0) && (error == 0)) {
|
|
len = min(uio->uio_resid, m->m_len);
|
|
if (len == 0)
|
|
break;
|
|
|
|
error = uiomove(mtod(m, void *), len, uio);
|
|
m = m_free(m);
|
|
}
|
|
|
|
if (m != NULL) {
|
|
TAPDEBUG("%s dropping mbuf, minor = %#x\n", ifp->if_xname,
|
|
minor(dev));
|
|
m_freem(m);
|
|
}
|
|
|
|
return (error);
|
|
} /* tapread */
|
|
|
|
|
|
/*
|
|
* tapwrite
|
|
*
|
|
* the cdevsw write interface - an atomic write is a packet - or else!
|
|
*/
|
|
static int
|
|
tapwrite(dev, uio, flag)
|
|
struct cdev *dev;
|
|
struct uio *uio;
|
|
int flag;
|
|
{
|
|
struct tap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = &tp->tap_if;
|
|
struct mbuf *m;
|
|
int error = 0;
|
|
|
|
TAPDEBUG("%s writting, minor = %#x\n",
|
|
ifp->if_xname, minor(dev));
|
|
|
|
if (uio->uio_resid == 0)
|
|
return (0);
|
|
|
|
if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) {
|
|
TAPDEBUG("%s invalid packet len = %d, minor = %#x\n",
|
|
ifp->if_xname, uio->uio_resid, minor(dev));
|
|
|
|
return (EIO);
|
|
}
|
|
|
|
if ((m = m_uiotombuf(uio, M_DONTWAIT, 0, ETHER_ALIGN)) == NULL) {
|
|
ifp->if_ierrors ++;
|
|
return (error);
|
|
}
|
|
|
|
m->m_pkthdr.rcvif = ifp;
|
|
|
|
/* Pass packet up to parent. */
|
|
(*ifp->if_input)(ifp, m);
|
|
ifp->if_ipackets ++; /* ibytes are counted in parent */
|
|
|
|
return (0);
|
|
} /* tapwrite */
|
|
|
|
|
|
/*
|
|
* tappoll
|
|
*
|
|
* the poll 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
|
|
*/
|
|
static int
|
|
tappoll(dev, events, td)
|
|
struct cdev *dev;
|
|
int events;
|
|
struct thread *td;
|
|
{
|
|
struct tap_softc *tp = dev->si_drv1;
|
|
struct ifnet *ifp = &tp->tap_if;
|
|
int s, revents = 0;
|
|
|
|
TAPDEBUG("%s polling, minor = %#x\n",
|
|
ifp->if_xname, minor(dev));
|
|
|
|
s = splimp();
|
|
if (events & (POLLIN | POLLRDNORM)) {
|
|
if (ifp->if_snd.ifq_len > 0) {
|
|
TAPDEBUG("%s have data in queue. len = %d, " \
|
|
"minor = %#x\n", ifp->if_xname,
|
|
ifp->if_snd.ifq_len, minor(dev));
|
|
|
|
revents |= (events & (POLLIN | POLLRDNORM));
|
|
} else {
|
|
TAPDEBUG("%s waiting for data, minor = %#x\n",
|
|
ifp->if_xname, minor(dev));
|
|
|
|
selrecord(td, &tp->tap_rsel);
|
|
}
|
|
}
|
|
|
|
if (events & (POLLOUT | POLLWRNORM))
|
|
revents |= (events & (POLLOUT | POLLWRNORM));
|
|
|
|
splx(s);
|
|
return (revents);
|
|
} /* tappoll */
|