freebsd-dev/sys/net/if_tap.c
Ed Schouten 29d4cb241b Don't enforce unique device minor number policy anymore.
Except for the case where we use the cloner library (clone_create() and
friends), there is no reason to enforce a unique device minor number
policy. There are various drivers in the source tree that allocate unr
pools and such to provide minor numbers, without using them themselves.

Because we still need to support unique device minor numbers for the
cloner library, introduce a new flag called D_NEEDMINOR. All cdevsw's
that are used in combination with the cloner library should be marked
with this flag to make the cloning work.

This means drivers can now freely use si_drv0 to store their own flags
and state, making it effectively the same as si_drv1 and si_drv2. We
still keep the minor() and dev2unit() routines around to make drivers
happy.

The NTFS code also used the minor number in its hash table. We should
not do this anymore. If the si_drv0 field would be changed, it would no
longer end up in the same list.

Approved by:	philip (mentor)
2008-06-11 18:55:19 +00:00

1105 lines
24 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_compat.h"
#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/priv.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_clone.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/if_types.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 *, struct ucred *, 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 *);
static int tap_clone_create(struct if_clone *, int, caddr_t);
static void tap_clone_destroy(struct ifnet *);
static int vmnet_clone_create(struct if_clone *, int, caddr_t);
static void vmnet_clone_destroy(struct ifnet *);
IFC_SIMPLE_DECLARE(tap, 0);
IFC_SIMPLE_DECLARE(vmnet, 0);
/* 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 d_kqfilter_t tapkqfilter;
/* kqueue(2) */
static int tapkqread(struct knote *, long);
static int tapkqwrite(struct knote *, long);
static void tapkqdetach(struct knote *);
static struct filterops tap_read_filterops = {
.f_isfd = 1,
.f_attach = NULL,
.f_detach = tapkqdetach,
.f_event = tapkqread,
};
static struct filterops tap_write_filterops = {
.f_isfd = 1,
.f_attach = NULL,
.f_detach = tapkqdetach,
.f_event = tapkqwrite,
};
static struct cdevsw tap_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_PSEUDO | D_NEEDGIANT | D_NEEDMINOR,
.d_open = tapopen,
.d_close = tapclose,
.d_read = tapread,
.d_write = tapwrite,
.d_ioctl = tapioctl,
.d_poll = tappoll,
.d_name = CDEV_NAME,
.d_kqfilter = tapkqfilter,
};
/*
* 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 int tapuponopen = 0; /* IFF_UP on open() */
static int tapdclone = 1; /* enable devfs cloning */
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, up_on_open, CTLFLAG_RW, &tapuponopen, 0,
"Bring interface up when /dev/tap is opened");
SYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RW, &tapdclone, 0,
"Enably legacy devfs interface creation");
SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, "");
TUNABLE_INT("net.link.tap.devfs_cloning", &tapdclone);
DEV_MODULE(if_tap, tapmodevent, NULL);
static int
tap_clone_create(struct if_clone *ifc, int unit, caddr_t params)
{
struct cdev *dev;
int i;
int extra;
if (strcmp(ifc->ifc_name, VMNET) == 0)
extra = VMNET_DEV_MASK;
else
extra = 0;
/* 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", ifc->ifc_name, unit);
if (dev != NULL) {
dev_ref(dev);
dev->si_flags |= SI_CHEAPCLONE;
}
}
tapcreate(dev);
return (0);
}
/* vmnet devices are tap devices in disguise */
static int
vmnet_clone_create(struct if_clone *ifc, int unit, caddr_t params)
{
return tap_clone_create(ifc, unit, params);
}
static void
tap_destroy(struct tap_softc *tp)
{
struct ifnet *ifp = tp->tap_ifp;
int s;
/* Unlocked read. */
KASSERT(!(tp->tap_flags & TAP_OPEN),
("%s flags is out of sync", ifp->if_xname));
knlist_destroy(&tp->tap_rsel.si_note);
destroy_dev(tp->tap_dev);
s = splimp();
ether_ifdetach(ifp);
if_free_type(ifp, IFT_ETHER);
splx(s);
mtx_destroy(&tp->tap_mtx);
free(tp, M_TAP);
}
static void
tap_clone_destroy(struct ifnet *ifp)
{
struct tap_softc *tp = ifp->if_softc;
mtx_lock(&tapmtx);
SLIST_REMOVE(&taphead, tp, tap_softc, tap_next);
mtx_unlock(&tapmtx);
tap_destroy(tp);
}
/* vmnet devices are tap devices in disguise */
static void
vmnet_clone_destroy(struct ifnet *ifp)
{
tap_clone_destroy(ifp);
}
/*
* tapmodevent
*
* module event handler
*/
static int
tapmodevent(module_t mod, int type, void *data)
{
static eventhandler_tag eh_tag = NULL;
struct tap_softc *tp = NULL;
struct ifnet *ifp = NULL;
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);
}
if_clone_attach(&tap_cloner);
if_clone_attach(&vmnet_cloner);
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);
if_clone_detach(&tap_cloner);
if_clone_detach(&vmnet_cloner);
mtx_lock(&tapmtx);
while ((tp = SLIST_FIRST(&taphead)) != NULL) {
SLIST_REMOVE_HEAD(&taphead, tap_next);
mtx_unlock(&tapmtx);
ifp = tp->tap_ifp;
TAPDEBUG("detaching %s\n", ifp->if_xname);
tap_destroy(tp);
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(void *arg, struct ucred *cred, char *name, int namelen, struct cdev **dev)
{
char devname[SPECNAMELEN + 1];
int i, unit, append_unit;
int extra;
if (*dev != NULL)
return;
if (!tapdclone ||
(!tapuopen && priv_check_cred(cred, PRIV_NET_IFCREATE, 0) != 0))
return;
unit = 0;
append_unit = 0;
extra = 0;
/* We're interested in only tap/vmnet devices. */
if (strcmp(name, TAP) == 0) {
unit = -1;
} else if (strcmp(name, VMNET) == 0) {
unit = -1;
extra = VMNET_DEV_MASK;
} else if (dev_stdclone(name, NULL, TAP, &unit) != 1) {
if (dev_stdclone(name, NULL, VMNET, &unit) != 1) {
return;
} else {
extra = VMNET_DEV_MASK;
}
}
if (unit == -1)
append_unit = 1;
/* find any existing device, or allocate new unit number */
i = clone_create(&tapclones, &tap_cdevsw, &unit, dev, extra);
if (i) {
if (append_unit) {
/*
* We were passed 'tun' or 'tap', with no unit specified
* so we'll need to append it now.
*/
namelen = snprintf(devname, sizeof(devname), "%s%d", name,
unit);
name = devname;
}
*dev = make_dev(&tap_cdevsw, unit2minor(unit | extra),
UID_ROOT, GID_WHEEL, 0600, "%s", name);
if (*dev != NULL) {
dev_ref(*dev);
(*dev)->si_flags |= SI_CHEAPCLONE;
}
}
if_clone_create(name, namelen, NULL);
} /* tapclone */
/*
* tapcreate
*
* to create interface
*/
static void
tapcreate(struct cdev *dev)
{
struct ifnet *ifp = NULL;
struct tap_softc *tp = NULL;
unsigned short macaddr_hi;
uint32_t macaddr_mid;
int unit, s;
char *name = NULL;
u_char eaddr[6];
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);
macaddr_mid = (uint32_t) ticks;
bcopy(&macaddr_hi, eaddr, sizeof(short));
bcopy(&macaddr_mid, &eaddr[2], sizeof(uint32_t));
eaddr[5] = (u_char)unit;
/* fill the rest and attach interface */
ifp = tp->tap_ifp = if_alloc(IFT_ETHER);
if (ifp == NULL)
panic("%s%d: can not if_alloc()", name, unit);
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, eaddr);
splx(s);
mtx_lock(&tp->tap_mtx);
tp->tap_flags |= TAP_INITED;
mtx_unlock(&tp->tap_mtx);
knlist_init(&tp->tap_rsel.si_note, NULL, NULL, NULL, NULL);
TAPDEBUG("interface %s is created. minor = %#x\n",
ifp->if_xname, minor(dev));
} /* tapcreate */
/*
* tapopen
*
* to open tunnel. must be superuser
*/
static int
tapopen(struct cdev *dev, int flag, int mode, struct thread *td)
{
struct tap_softc *tp = NULL;
struct ifnet *ifp = NULL;
int error, s;
if (tapuopen == 0) {
error = priv_check(td, PRIV_NET_TAP);
if (error)
return (error);
}
if ((dev2unit(dev) & CLONE_UNITMASK) > TAPMAXUNIT)
return (ENXIO);
tp = dev->si_drv1;
mtx_lock(&tp->tap_mtx);
if (tp->tap_flags & TAP_OPEN) {
mtx_unlock(&tp->tap_mtx);
return (EBUSY);
}
bcopy(IF_LLADDR(tp->tap_ifp), tp->ether_addr, sizeof(tp->ether_addr));
tp->tap_pid = td->td_proc->p_pid;
tp->tap_flags |= TAP_OPEN;
ifp = tp->tap_ifp;
mtx_unlock(&tp->tap_mtx);
s = splimp();
ifp->if_drv_flags |= IFF_DRV_RUNNING;
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
if (tapuponopen)
ifp->if_flags |= IFF_UP;
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(struct cdev *dev, int foo, int bar, struct thread *td)
{
struct ifaddr *ifa;
struct tap_softc *tp = dev->si_drv1;
struct ifnet *ifp = tp->tap_ifp;
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_drv_flags & IFF_DRV_RUNNING) {
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
rtinit(ifa, (int)RTM_DELETE, 0);
}
if_purgeaddrs(ifp);
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
}
splx(s);
} else
mtx_unlock(&tp->tap_mtx);
funsetown(&tp->tap_sigio);
selwakeuppri(&tp->tap_rsel, PZERO+1);
KNOTE_UNLOCKED(&tp->tap_rsel.si_note, 0);
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(void *xtp)
{
struct tap_softc *tp = (struct tap_softc *)xtp;
struct ifnet *ifp = tp->tap_ifp;
TAPDEBUG("initializing %s\n", ifp->if_xname);
ifp->if_drv_flags |= IFF_DRV_RUNNING;
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
/* attempt to start output */
tapifstart(ifp);
} /* tapifinit */
/*
* tapifioctl
*
* Process an ioctl request on network interface
*/
static int
tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct tap_softc *tp = 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);
/* NOT REACHED */
}
return (0);
} /* tapifioctl */
/*
* tapifstart
*
* queue packets from higher level ready to put out
*/
static void
tapifstart(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_drv_flags |= IFF_DRV_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);
KNOTE_UNLOCKED(&tp->tap_rsel.si_note, 0);
ifp->if_opackets ++; /* obytes are counted in ether_output */
}
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
splx(s);
} /* tapifstart */
/*
* tapioctl
*
* the cdevsw interface is now pretty minimal
*/
static int
tapioctl(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_ifp;
struct tapinfo *tapp = NULL;
int s;
int f;
#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
defined(COMPAT_FREEBSD4)
int ival;
#endif
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;
#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
defined(COMPAT_FREEBSD4)
case _IO('V', 0):
ival = IOCPARM_IVAL(data);
data = (caddr_t)&ival;
/* FALLTHROUGH */
#endif
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(struct cdev *dev, struct uio *uio, int flag)
{
struct tap_softc *tp = dev->si_drv1;
struct ifnet *ifp = tp->tap_ifp;
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(struct cdev *dev, struct uio *uio, int flag)
{
struct ether_header *eh;
struct tap_softc *tp = dev->si_drv1;
struct ifnet *ifp = tp->tap_ifp;
struct mbuf *m;
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,
M_PKTHDR)) == NULL) {
ifp->if_ierrors ++;
return (ENOBUFS);
}
m->m_pkthdr.rcvif = ifp;
/*
* Only pass a unicast frame to ether_input(), if it would actually
* have been received by non-virtual hardware.
*/
if (m->m_len < sizeof(struct ether_header)) {
m_freem(m);
return (0);
}
eh = mtod(m, struct ether_header *);
if (eh && (ifp->if_flags & IFF_PROMISC) == 0 &&
!ETHER_IS_MULTICAST(eh->ether_dhost) &&
bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) {
m_freem(m);
return (0);
}
/* 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(struct cdev *dev, int events, struct thread *td)
{
struct tap_softc *tp = dev->si_drv1;
struct ifnet *ifp = tp->tap_ifp;
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 */
/*
* tap_kqfilter
*
* support for kevent() system call
*/
static int
tapkqfilter(struct cdev *dev, struct knote *kn)
{
int s;
struct tap_softc *tp = dev->si_drv1;
struct ifnet *ifp = tp->tap_ifp;
s = splimp();
switch (kn->kn_filter) {
case EVFILT_READ:
TAPDEBUG("%s kqfilter: EVFILT_READ, minor = %#x\n",
ifp->if_xname, minor(dev));
kn->kn_fop = &tap_read_filterops;
break;
case EVFILT_WRITE:
TAPDEBUG("%s kqfilter: EVFILT_WRITE, minor = %#x\n",
ifp->if_xname, minor(dev));
kn->kn_fop = &tap_write_filterops;
break;
default:
TAPDEBUG("%s kqfilter: invalid filter, minor = %#x\n",
ifp->if_xname, minor(dev));
splx(s);
return (EINVAL);
/* NOT REACHED */
}
splx(s);
kn->kn_hook = (caddr_t) dev;
knlist_add(&tp->tap_rsel.si_note, kn, 0);
return (0);
} /* tapkqfilter */
/*
* tap_kqread
*
* Return true if there is data in the interface queue
*/
static int
tapkqread(struct knote *kn, long hint)
{
int ret, s;
struct cdev *dev = (struct cdev *)(kn->kn_hook);
struct tap_softc *tp = dev->si_drv1;
struct ifnet *ifp = tp->tap_ifp;
s = splimp();
if ((kn->kn_data = 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));
ret = 1;
} else {
TAPDEBUG("%s waiting for data, minor = %#x\n",
ifp->if_xname, minor(dev));
ret = 0;
}
splx(s);
return (ret);
} /* tapkqread */
/*
* tap_kqwrite
*
* Always can write. Return the MTU in kn->data
*/
static int
tapkqwrite(struct knote *kn, long hint)
{
int s;
struct tap_softc *tp = ((struct cdev *) kn->kn_hook)->si_drv1;
struct ifnet *ifp = tp->tap_ifp;
s = splimp();
kn->kn_data = ifp->if_mtu;
splx(s);
return (1);
} /* tapkqwrite */
static void
tapkqdetach(struct knote *kn)
{
struct tap_softc *tp = ((struct cdev *) kn->kn_hook)->si_drv1;
knlist_remove(&tp->tap_rsel.si_note, kn, 0);
} /* tapkqdetach */