35 * $Id: if_tap.c,v 0.21 2000/07/23 21:46:02 max Exp $
36 */
37
38#include "opt_compat.h"
39#include "opt_inet.h"
40
41#include <sys/param.h>
42#include <sys/conf.h>
43#include <sys/fcntl.h>
44#include <sys/filio.h>
45#include <sys/jail.h>
46#include <sys/kernel.h>
47#include <sys/malloc.h>
48#include <sys/mbuf.h>
49#include <sys/module.h>
50#include <sys/poll.h>
51#include <sys/priv.h>
52#include <sys/proc.h>
53#include <sys/selinfo.h>
54#include <sys/signalvar.h>
55#include <sys/socket.h>
56#include <sys/sockio.h>
57#include <sys/sysctl.h>
58#include <sys/systm.h>
59#include <sys/ttycom.h>
60#include <sys/uio.h>
61#include <sys/queue.h>
62
63#include <net/bpf.h>
64#include <net/ethernet.h>
65#include <net/if.h>
66#include <net/if_var.h>
67#include <net/if_clone.h>
68#include <net/if_dl.h>
69#include <net/if_media.h>
70#include <net/if_types.h>
71#include <net/route.h>
72#include <net/vnet.h>
73
74#include <netinet/in.h>
75
76#include <net/if_tapvar.h>
77#include <net/if_tap.h>
78
79
80#define CDEV_NAME "tap"
81#define TAPDEBUG if (tapdebug) printf
82
83static const char tapname[] = "tap";
84static const char vmnetname[] = "vmnet";
85#define TAPMAXUNIT 0x7fff
86#define VMNET_DEV_MASK CLONE_FLAG0
87
88/* module */
89static int tapmodevent(module_t, int, void *);
90
91/* device */
92static void tapclone(void *, struct ucred *, char *, int,
93 struct cdev **);
94static void tapcreate(struct cdev *);
95
96/* network interface */
97static void tapifstart(struct ifnet *);
98static int tapifioctl(struct ifnet *, u_long, caddr_t);
99static void tapifinit(void *);
100
101static int tap_clone_create(struct if_clone *, int, caddr_t);
102static void tap_clone_destroy(struct ifnet *);
103static struct if_clone *tap_cloner;
104static int vmnet_clone_create(struct if_clone *, int, caddr_t);
105static void vmnet_clone_destroy(struct ifnet *);
106static struct if_clone *vmnet_cloner;
107
108/* character device */
109static d_open_t tapopen;
110static d_close_t tapclose;
111static d_read_t tapread;
112static d_write_t tapwrite;
113static d_ioctl_t tapioctl;
114static d_poll_t tappoll;
115static d_kqfilter_t tapkqfilter;
116
117/* kqueue(2) */
118static int tapkqread(struct knote *, long);
119static int tapkqwrite(struct knote *, long);
120static void tapkqdetach(struct knote *);
121
122static struct filterops tap_read_filterops = {
123 .f_isfd = 1,
124 .f_attach = NULL,
125 .f_detach = tapkqdetach,
126 .f_event = tapkqread,
127};
128
129static struct filterops tap_write_filterops = {
130 .f_isfd = 1,
131 .f_attach = NULL,
132 .f_detach = tapkqdetach,
133 .f_event = tapkqwrite,
134};
135
136static struct cdevsw tap_cdevsw = {
137 .d_version = D_VERSION,
138 .d_flags = D_NEEDMINOR,
139 .d_open = tapopen,
140 .d_close = tapclose,
141 .d_read = tapread,
142 .d_write = tapwrite,
143 .d_ioctl = tapioctl,
144 .d_poll = tappoll,
145 .d_name = CDEV_NAME,
146 .d_kqfilter = tapkqfilter,
147};
148
149/*
150 * All global variables in if_tap.c are locked with tapmtx, with the
151 * exception of tapdebug, which is accessed unlocked; tapclones is
152 * static at runtime.
153 */
154static struct mtx tapmtx;
155static int tapdebug = 0; /* debug flag */
156static int tapuopen = 0; /* allow user open() */
157static int tapuponopen = 0; /* IFF_UP on open() */
158static int tapdclone = 1; /* enable devfs cloning */
159static SLIST_HEAD(, tap_softc) taphead; /* first device */
160static struct clonedevs *tapclones;
161
162MALLOC_DECLARE(M_TAP);
163MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface");
164SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, "");
165
166SYSCTL_DECL(_net_link);
167static SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0,
168 "Ethernet tunnel software network interface");
169SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0,
170 "Allow user to open /dev/tap (based on node permissions)");
171SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0,
172 "Bring interface up when /dev/tap is opened");
173SYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tapdclone, 0,
174 "Enable legacy devfs interface creation");
175SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, "");
176
177DEV_MODULE(if_tap, tapmodevent, NULL);
| 35 * $Id: if_tap.c,v 0.21 2000/07/23 21:46:02 max Exp $
36 */
37
38#include "opt_compat.h"
39#include "opt_inet.h"
40
41#include <sys/param.h>
42#include <sys/conf.h>
43#include <sys/fcntl.h>
44#include <sys/filio.h>
45#include <sys/jail.h>
46#include <sys/kernel.h>
47#include <sys/malloc.h>
48#include <sys/mbuf.h>
49#include <sys/module.h>
50#include <sys/poll.h>
51#include <sys/priv.h>
52#include <sys/proc.h>
53#include <sys/selinfo.h>
54#include <sys/signalvar.h>
55#include <sys/socket.h>
56#include <sys/sockio.h>
57#include <sys/sysctl.h>
58#include <sys/systm.h>
59#include <sys/ttycom.h>
60#include <sys/uio.h>
61#include <sys/queue.h>
62
63#include <net/bpf.h>
64#include <net/ethernet.h>
65#include <net/if.h>
66#include <net/if_var.h>
67#include <net/if_clone.h>
68#include <net/if_dl.h>
69#include <net/if_media.h>
70#include <net/if_types.h>
71#include <net/route.h>
72#include <net/vnet.h>
73
74#include <netinet/in.h>
75
76#include <net/if_tapvar.h>
77#include <net/if_tap.h>
78
79
80#define CDEV_NAME "tap"
81#define TAPDEBUG if (tapdebug) printf
82
83static const char tapname[] = "tap";
84static const char vmnetname[] = "vmnet";
85#define TAPMAXUNIT 0x7fff
86#define VMNET_DEV_MASK CLONE_FLAG0
87
88/* module */
89static int tapmodevent(module_t, int, void *);
90
91/* device */
92static void tapclone(void *, struct ucred *, char *, int,
93 struct cdev **);
94static void tapcreate(struct cdev *);
95
96/* network interface */
97static void tapifstart(struct ifnet *);
98static int tapifioctl(struct ifnet *, u_long, caddr_t);
99static void tapifinit(void *);
100
101static int tap_clone_create(struct if_clone *, int, caddr_t);
102static void tap_clone_destroy(struct ifnet *);
103static struct if_clone *tap_cloner;
104static int vmnet_clone_create(struct if_clone *, int, caddr_t);
105static void vmnet_clone_destroy(struct ifnet *);
106static struct if_clone *vmnet_cloner;
107
108/* character device */
109static d_open_t tapopen;
110static d_close_t tapclose;
111static d_read_t tapread;
112static d_write_t tapwrite;
113static d_ioctl_t tapioctl;
114static d_poll_t tappoll;
115static d_kqfilter_t tapkqfilter;
116
117/* kqueue(2) */
118static int tapkqread(struct knote *, long);
119static int tapkqwrite(struct knote *, long);
120static void tapkqdetach(struct knote *);
121
122static struct filterops tap_read_filterops = {
123 .f_isfd = 1,
124 .f_attach = NULL,
125 .f_detach = tapkqdetach,
126 .f_event = tapkqread,
127};
128
129static struct filterops tap_write_filterops = {
130 .f_isfd = 1,
131 .f_attach = NULL,
132 .f_detach = tapkqdetach,
133 .f_event = tapkqwrite,
134};
135
136static struct cdevsw tap_cdevsw = {
137 .d_version = D_VERSION,
138 .d_flags = D_NEEDMINOR,
139 .d_open = tapopen,
140 .d_close = tapclose,
141 .d_read = tapread,
142 .d_write = tapwrite,
143 .d_ioctl = tapioctl,
144 .d_poll = tappoll,
145 .d_name = CDEV_NAME,
146 .d_kqfilter = tapkqfilter,
147};
148
149/*
150 * All global variables in if_tap.c are locked with tapmtx, with the
151 * exception of tapdebug, which is accessed unlocked; tapclones is
152 * static at runtime.
153 */
154static struct mtx tapmtx;
155static int tapdebug = 0; /* debug flag */
156static int tapuopen = 0; /* allow user open() */
157static int tapuponopen = 0; /* IFF_UP on open() */
158static int tapdclone = 1; /* enable devfs cloning */
159static SLIST_HEAD(, tap_softc) taphead; /* first device */
160static struct clonedevs *tapclones;
161
162MALLOC_DECLARE(M_TAP);
163MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface");
164SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, "");
165
166SYSCTL_DECL(_net_link);
167static SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0,
168 "Ethernet tunnel software network interface");
169SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0,
170 "Allow user to open /dev/tap (based on node permissions)");
171SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0,
172 "Bring interface up when /dev/tap is opened");
173SYSCTL_INT(_net_link_tap, OID_AUTO, devfs_cloning, CTLFLAG_RWTUN, &tapdclone, 0,
174 "Enable legacy devfs interface creation");
175SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, "");
176
177DEV_MODULE(if_tap, tapmodevent, NULL);
|
178
179static int
180tap_clone_create(struct if_clone *ifc, int unit, caddr_t params)
181{
182 struct cdev *dev;
183 int i;
184
185 /* Find any existing device, or allocate new unit number. */
186 i = clone_create(&tapclones, &tap_cdevsw, &unit, &dev, 0);
187 if (i) {
188 dev = make_dev(&tap_cdevsw, unit, UID_ROOT, GID_WHEEL, 0600,
189 "%s%d", tapname, unit);
190 }
191
192 tapcreate(dev);
193 return (0);
194}
195
196/* vmnet devices are tap devices in disguise */
197static int
198vmnet_clone_create(struct if_clone *ifc, int unit, caddr_t params)
199{
200 struct cdev *dev;
201 int i;
202
203 /* Find any existing device, or allocate new unit number. */
204 i = clone_create(&tapclones, &tap_cdevsw, &unit, &dev, VMNET_DEV_MASK);
205 if (i) {
206 dev = make_dev(&tap_cdevsw, unit | VMNET_DEV_MASK, UID_ROOT,
207 GID_WHEEL, 0600, "%s%d", vmnetname, unit);
208 }
209
210 tapcreate(dev);
211 return (0);
212}
213
214static void
215tap_destroy(struct tap_softc *tp)
216{
217 struct ifnet *ifp = tp->tap_ifp;
218
219 CURVNET_SET(ifp->if_vnet);
220 destroy_dev(tp->tap_dev);
221 seldrain(&tp->tap_rsel);
222 knlist_clear(&tp->tap_rsel.si_note, 0);
223 knlist_destroy(&tp->tap_rsel.si_note);
224 ether_ifdetach(ifp);
225 if_free(ifp);
226
227 mtx_destroy(&tp->tap_mtx);
228 free(tp, M_TAP);
229 CURVNET_RESTORE();
230}
231
232static void
233tap_clone_destroy(struct ifnet *ifp)
234{
235 struct tap_softc *tp = ifp->if_softc;
236
237 mtx_lock(&tapmtx);
238 SLIST_REMOVE(&taphead, tp, tap_softc, tap_next);
239 mtx_unlock(&tapmtx);
240 tap_destroy(tp);
241}
242
243/* vmnet devices are tap devices in disguise */
244static void
245vmnet_clone_destroy(struct ifnet *ifp)
246{
247 tap_clone_destroy(ifp);
248}
249
250/*
251 * tapmodevent
252 *
253 * module event handler
254 */
255static int
256tapmodevent(module_t mod, int type, void *data)
257{
258 static eventhandler_tag eh_tag = NULL;
259 struct tap_softc *tp = NULL;
260 struct ifnet *ifp = NULL;
261
262 switch (type) {
263 case MOD_LOAD:
264
265 /* intitialize device */
266
267 mtx_init(&tapmtx, "tapmtx", NULL, MTX_DEF);
268 SLIST_INIT(&taphead);
269
270 clone_setup(&tapclones);
271 eh_tag = EVENTHANDLER_REGISTER(dev_clone, tapclone, 0, 1000);
272 if (eh_tag == NULL) {
273 clone_cleanup(&tapclones);
274 mtx_destroy(&tapmtx);
275 return (ENOMEM);
276 }
277 tap_cloner = if_clone_simple(tapname, tap_clone_create,
278 tap_clone_destroy, 0);
279 vmnet_cloner = if_clone_simple(vmnetname, vmnet_clone_create,
280 vmnet_clone_destroy, 0);
281 return (0);
282
283 case MOD_UNLOAD:
284 /*
285 * The EBUSY algorithm here can't quite atomically
286 * guarantee that this is race-free since we have to
287 * release the tap mtx to deregister the clone handler.
288 */
289 mtx_lock(&tapmtx);
290 SLIST_FOREACH(tp, &taphead, tap_next) {
291 mtx_lock(&tp->tap_mtx);
292 if (tp->tap_flags & TAP_OPEN) {
293 mtx_unlock(&tp->tap_mtx);
294 mtx_unlock(&tapmtx);
295 return (EBUSY);
296 }
297 mtx_unlock(&tp->tap_mtx);
298 }
299 mtx_unlock(&tapmtx);
300
301 EVENTHANDLER_DEREGISTER(dev_clone, eh_tag);
302 if_clone_detach(tap_cloner);
303 if_clone_detach(vmnet_cloner);
304 drain_dev_clone_events();
305
306 mtx_lock(&tapmtx);
307 while ((tp = SLIST_FIRST(&taphead)) != NULL) {
308 SLIST_REMOVE_HEAD(&taphead, tap_next);
309 mtx_unlock(&tapmtx);
310
311 ifp = tp->tap_ifp;
312
313 TAPDEBUG("detaching %s\n", ifp->if_xname);
314
315 tap_destroy(tp);
316 mtx_lock(&tapmtx);
317 }
318 mtx_unlock(&tapmtx);
319 clone_cleanup(&tapclones);
320
321 mtx_destroy(&tapmtx);
322
323 break;
324
325 default:
326 return (EOPNOTSUPP);
327 }
328
329 return (0);
330} /* tapmodevent */
331
332
333/*
334 * DEVFS handler
335 *
336 * We need to support two kind of devices - tap and vmnet
337 */
338static void
339tapclone(void *arg, struct ucred *cred, char *name, int namelen, struct cdev **dev)
340{
341 char devname[SPECNAMELEN + 1];
342 int i, unit, append_unit;
343 int extra;
344
345 if (*dev != NULL)
346 return;
347
348 if (!tapdclone ||
349 (!tapuopen && priv_check_cred(cred, PRIV_NET_IFCREATE, 0) != 0))
350 return;
351
352 unit = 0;
353 append_unit = 0;
354 extra = 0;
355
356 /* We're interested in only tap/vmnet devices. */
357 if (strcmp(name, tapname) == 0) {
358 unit = -1;
359 } else if (strcmp(name, vmnetname) == 0) {
360 unit = -1;
361 extra = VMNET_DEV_MASK;
362 } else if (dev_stdclone(name, NULL, tapname, &unit) != 1) {
363 if (dev_stdclone(name, NULL, vmnetname, &unit) != 1) {
364 return;
365 } else {
366 extra = VMNET_DEV_MASK;
367 }
368 }
369
370 if (unit == -1)
371 append_unit = 1;
372
373 CURVNET_SET(CRED_TO_VNET(cred));
374 /* find any existing device, or allocate new unit number */
375 i = clone_create(&tapclones, &tap_cdevsw, &unit, dev, extra);
376 if (i) {
377 if (append_unit) {
378 /*
379 * We were passed 'tun' or 'tap', with no unit specified
380 * so we'll need to append it now.
381 */
382 namelen = snprintf(devname, sizeof(devname), "%s%d", name,
383 unit);
384 name = devname;
385 }
386
387 *dev = make_dev_credf(MAKEDEV_REF, &tap_cdevsw, unit | extra,
388 cred, UID_ROOT, GID_WHEEL, 0600, "%s", name);
389 }
390
391 if_clone_create(name, namelen, NULL);
392 CURVNET_RESTORE();
393} /* tapclone */
394
395
396/*
397 * tapcreate
398 *
399 * to create interface
400 */
401static void
402tapcreate(struct cdev *dev)
403{
404 struct ifnet *ifp = NULL;
405 struct tap_softc *tp = NULL;
406 unsigned short macaddr_hi;
407 uint32_t macaddr_mid;
408 int unit;
409 const char *name = NULL;
410 u_char eaddr[6];
411
412 /* allocate driver storage and create device */
413 tp = malloc(sizeof(*tp), M_TAP, M_WAITOK | M_ZERO);
414 mtx_init(&tp->tap_mtx, "tap_mtx", NULL, MTX_DEF);
415 mtx_lock(&tapmtx);
416 SLIST_INSERT_HEAD(&taphead, tp, tap_next);
417 mtx_unlock(&tapmtx);
418
419 unit = dev2unit(dev);
420
421 /* select device: tap or vmnet */
422 if (unit & VMNET_DEV_MASK) {
423 name = vmnetname;
424 tp->tap_flags |= TAP_VMNET;
425 } else
426 name = tapname;
427
428 unit &= TAPMAXUNIT;
429
430 TAPDEBUG("tapcreate(%s%d). minor = %#x\n", name, unit, dev2unit(dev));
431
432 /* generate fake MAC address: 00 bd xx xx xx unit_no */
433 macaddr_hi = htons(0x00bd);
434 macaddr_mid = (uint32_t) ticks;
435 bcopy(&macaddr_hi, eaddr, sizeof(short));
436 bcopy(&macaddr_mid, &eaddr[2], sizeof(uint32_t));
437 eaddr[5] = (u_char)unit;
438
439 /* fill the rest and attach interface */
440 ifp = tp->tap_ifp = if_alloc(IFT_ETHER);
441 if (ifp == NULL)
442 panic("%s%d: can not if_alloc()", name, unit);
443 ifp->if_softc = tp;
444 if_initname(ifp, name, unit);
445 ifp->if_init = tapifinit;
446 ifp->if_start = tapifstart;
447 ifp->if_ioctl = tapifioctl;
448 ifp->if_mtu = ETHERMTU;
449 ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST);
450 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
451 ifp->if_capabilities |= IFCAP_LINKSTATE;
452 ifp->if_capenable |= IFCAP_LINKSTATE;
453
454 dev->si_drv1 = tp;
455 tp->tap_dev = dev;
456
457 ether_ifattach(ifp, eaddr);
458
459 mtx_lock(&tp->tap_mtx);
460 tp->tap_flags |= TAP_INITED;
461 mtx_unlock(&tp->tap_mtx);
462
463 knlist_init_mtx(&tp->tap_rsel.si_note, &tp->tap_mtx);
464
465 TAPDEBUG("interface %s is created. minor = %#x\n",
466 ifp->if_xname, dev2unit(dev));
467} /* tapcreate */
468
469
470/*
471 * tapopen
472 *
473 * to open tunnel. must be superuser
474 */
475static int
476tapopen(struct cdev *dev, int flag, int mode, struct thread *td)
477{
478 struct tap_softc *tp = NULL;
479 struct ifnet *ifp = NULL;
480 int error;
481
482 if (tapuopen == 0) {
483 error = priv_check(td, PRIV_NET_TAP);
484 if (error)
485 return (error);
486 }
487
488 if ((dev2unit(dev) & CLONE_UNITMASK) > TAPMAXUNIT)
489 return (ENXIO);
490
491 tp = dev->si_drv1;
492
493 mtx_lock(&tp->tap_mtx);
494 if (tp->tap_flags & TAP_OPEN) {
495 mtx_unlock(&tp->tap_mtx);
496 return (EBUSY);
497 }
498
499 bcopy(IF_LLADDR(tp->tap_ifp), tp->ether_addr, sizeof(tp->ether_addr));
500 tp->tap_pid = td->td_proc->p_pid;
501 tp->tap_flags |= TAP_OPEN;
502 ifp = tp->tap_ifp;
503
504 ifp->if_drv_flags |= IFF_DRV_RUNNING;
505 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
506 if (tapuponopen)
507 ifp->if_flags |= IFF_UP;
508 if_link_state_change(ifp, LINK_STATE_UP);
509 mtx_unlock(&tp->tap_mtx);
510
511 TAPDEBUG("%s is open. minor = %#x\n", ifp->if_xname, dev2unit(dev));
512
513 return (0);
514} /* tapopen */
515
516
517/*
518 * tapclose
519 *
520 * close the device - mark i/f down & delete routing info
521 */
522static int
523tapclose(struct cdev *dev, int foo, int bar, struct thread *td)
524{
525 struct ifaddr *ifa;
526 struct tap_softc *tp = dev->si_drv1;
527 struct ifnet *ifp = tp->tap_ifp;
528
529 /* junk all pending output */
530 mtx_lock(&tp->tap_mtx);
531 CURVNET_SET(ifp->if_vnet);
532 IF_DRAIN(&ifp->if_snd);
533
534 /*
535 * Do not bring the interface down, and do not anything with
536 * interface, if we are in VMnet mode. Just close the device.
537 */
538 if (((tp->tap_flags & TAP_VMNET) == 0) &&
539 (ifp->if_flags & (IFF_UP | IFF_LINK0)) == IFF_UP) {
540 mtx_unlock(&tp->tap_mtx);
541 if_down(ifp);
542 mtx_lock(&tp->tap_mtx);
543 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
544 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
545 mtx_unlock(&tp->tap_mtx);
546 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
547 rtinit(ifa, (int)RTM_DELETE, 0);
548 }
549 if_purgeaddrs(ifp);
550 mtx_lock(&tp->tap_mtx);
551 }
552 }
553
554 if_link_state_change(ifp, LINK_STATE_DOWN);
555 CURVNET_RESTORE();
556
557 funsetown(&tp->tap_sigio);
558 selwakeuppri(&tp->tap_rsel, PZERO+1);
559 KNOTE_LOCKED(&tp->tap_rsel.si_note, 0);
560
561 tp->tap_flags &= ~TAP_OPEN;
562 tp->tap_pid = 0;
563 mtx_unlock(&tp->tap_mtx);
564
565 TAPDEBUG("%s is closed. minor = %#x\n",
566 ifp->if_xname, dev2unit(dev));
567
568 return (0);
569} /* tapclose */
570
571
572/*
573 * tapifinit
574 *
575 * network interface initialization function
576 */
577static void
578tapifinit(void *xtp)
579{
580 struct tap_softc *tp = (struct tap_softc *)xtp;
581 struct ifnet *ifp = tp->tap_ifp;
582
583 TAPDEBUG("initializing %s\n", ifp->if_xname);
584
585 mtx_lock(&tp->tap_mtx);
586 ifp->if_drv_flags |= IFF_DRV_RUNNING;
587 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
588 mtx_unlock(&tp->tap_mtx);
589
590 /* attempt to start output */
591 tapifstart(ifp);
592} /* tapifinit */
593
594
595/*
596 * tapifioctl
597 *
598 * Process an ioctl request on network interface
599 */
600static int
601tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
602{
603 struct tap_softc *tp = ifp->if_softc;
604 struct ifreq *ifr = (struct ifreq *)data;
605 struct ifstat *ifs = NULL;
606 struct ifmediareq *ifmr = NULL;
607 int dummy, error = 0;
608
609 switch (cmd) {
610 case SIOCSIFFLAGS: /* XXX -- just like vmnet does */
611 case SIOCADDMULTI:
612 case SIOCDELMULTI:
613 break;
614
615 case SIOCGIFMEDIA:
616 ifmr = (struct ifmediareq *)data;
617 dummy = ifmr->ifm_count;
618 ifmr->ifm_count = 1;
619 ifmr->ifm_status = IFM_AVALID;
620 ifmr->ifm_active = IFM_ETHER;
621 if (tp->tap_flags & TAP_OPEN)
622 ifmr->ifm_status |= IFM_ACTIVE;
623 ifmr->ifm_current = ifmr->ifm_active;
624 if (dummy >= 1) {
625 int media = IFM_ETHER;
626 error = copyout(&media, ifmr->ifm_ulist,
627 sizeof(int));
628 }
629 break;
630
631 case SIOCSIFMTU:
632 ifp->if_mtu = ifr->ifr_mtu;
633 break;
634
635 case SIOCGIFSTATUS:
636 ifs = (struct ifstat *)data;
637 mtx_lock(&tp->tap_mtx);
638 if (tp->tap_pid != 0)
639 snprintf(ifs->ascii, sizeof(ifs->ascii),
640 "\tOpened by PID %d\n", tp->tap_pid);
641 else
642 ifs->ascii[0] = '\0';
643 mtx_unlock(&tp->tap_mtx);
644 break;
645
646 default:
647 error = ether_ioctl(ifp, cmd, data);
648 break;
649 }
650
651 return (error);
652} /* tapifioctl */
653
654
655/*
656 * tapifstart
657 *
658 * queue packets from higher level ready to put out
659 */
660static void
661tapifstart(struct ifnet *ifp)
662{
663 struct tap_softc *tp = ifp->if_softc;
664
665 TAPDEBUG("%s starting\n", ifp->if_xname);
666
667 /*
668 * do not junk pending output if we are in VMnet mode.
669 * XXX: can this do any harm because of queue overflow?
670 */
671
672 mtx_lock(&tp->tap_mtx);
673 if (((tp->tap_flags & TAP_VMNET) == 0) &&
674 ((tp->tap_flags & TAP_READY) != TAP_READY)) {
675 struct mbuf *m;
676
677 /* Unlocked read. */
678 TAPDEBUG("%s not ready, tap_flags = 0x%x\n", ifp->if_xname,
679 tp->tap_flags);
680
681 for (;;) {
682 IF_DEQUEUE(&ifp->if_snd, m);
683 if (m != NULL) {
684 m_freem(m);
685 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
686 } else
687 break;
688 }
689 mtx_unlock(&tp->tap_mtx);
690
691 return;
692 }
693
694 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
695
696 if (!IFQ_IS_EMPTY(&ifp->if_snd)) {
697 if (tp->tap_flags & TAP_RWAIT) {
698 tp->tap_flags &= ~TAP_RWAIT;
699 wakeup(tp);
700 }
701
702 if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) {
703 mtx_unlock(&tp->tap_mtx);
704 pgsigio(&tp->tap_sigio, SIGIO, 0);
705 mtx_lock(&tp->tap_mtx);
706 }
707
708 selwakeuppri(&tp->tap_rsel, PZERO+1);
709 KNOTE_LOCKED(&tp->tap_rsel.si_note, 0);
710 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); /* obytes are counted in ether_output */
711 }
712
713 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
714 mtx_unlock(&tp->tap_mtx);
715} /* tapifstart */
716
717
718/*
719 * tapioctl
720 *
721 * the cdevsw interface is now pretty minimal
722 */
723static int
724tapioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
725{
726 struct ifreq ifr;
727 struct tap_softc *tp = dev->si_drv1;
728 struct ifnet *ifp = tp->tap_ifp;
729 struct tapinfo *tapp = NULL;
730 int f;
731 int error;
732#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
733 defined(COMPAT_FREEBSD4)
734 int ival;
735#endif
736
737 switch (cmd) {
738 case TAPSIFINFO:
739 tapp = (struct tapinfo *)data;
740 if (ifp->if_type != tapp->type)
741 return (EPROTOTYPE);
742 mtx_lock(&tp->tap_mtx);
743 if (ifp->if_mtu != tapp->mtu) {
744 strncpy(ifr.ifr_name, if_name(ifp), IFNAMSIZ);
745 ifr.ifr_mtu = tapp->mtu;
746 CURVNET_SET(ifp->if_vnet);
747 error = ifhwioctl(SIOCSIFMTU, ifp,
748 (caddr_t)&ifr, td);
749 CURVNET_RESTORE();
750 if (error) {
751 mtx_unlock(&tp->tap_mtx);
752 return (error);
753 }
754 }
755 ifp->if_baudrate = tapp->baudrate;
756 mtx_unlock(&tp->tap_mtx);
757 break;
758
759 case TAPGIFINFO:
760 tapp = (struct tapinfo *)data;
761 mtx_lock(&tp->tap_mtx);
762 tapp->mtu = ifp->if_mtu;
763 tapp->type = ifp->if_type;
764 tapp->baudrate = ifp->if_baudrate;
765 mtx_unlock(&tp->tap_mtx);
766 break;
767
768 case TAPSDEBUG:
769 tapdebug = *(int *)data;
770 break;
771
772 case TAPGDEBUG:
773 *(int *)data = tapdebug;
774 break;
775
776 case TAPGIFNAME: {
777 struct ifreq *ifr = (struct ifreq *) data;
778
779 strlcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ);
780 } break;
781
782 case FIONBIO:
783 break;
784
785 case FIOASYNC:
786 mtx_lock(&tp->tap_mtx);
787 if (*(int *)data)
788 tp->tap_flags |= TAP_ASYNC;
789 else
790 tp->tap_flags &= ~TAP_ASYNC;
791 mtx_unlock(&tp->tap_mtx);
792 break;
793
794 case FIONREAD:
795 if (!IFQ_IS_EMPTY(&ifp->if_snd)) {
796 struct mbuf *mb;
797
798 IFQ_LOCK(&ifp->if_snd);
799 IFQ_POLL_NOLOCK(&ifp->if_snd, mb);
800 for (*(int *)data = 0; mb != NULL;
801 mb = mb->m_next)
802 *(int *)data += mb->m_len;
803 IFQ_UNLOCK(&ifp->if_snd);
804 } else
805 *(int *)data = 0;
806 break;
807
808 case FIOSETOWN:
809 return (fsetown(*(int *)data, &tp->tap_sigio));
810
811 case FIOGETOWN:
812 *(int *)data = fgetown(&tp->tap_sigio);
813 return (0);
814
815 /* this is deprecated, FIOSETOWN should be used instead */
816 case TIOCSPGRP:
817 return (fsetown(-(*(int *)data), &tp->tap_sigio));
818
819 /* this is deprecated, FIOGETOWN should be used instead */
820 case TIOCGPGRP:
821 *(int *)data = -fgetown(&tp->tap_sigio);
822 return (0);
823
824 /* VMware/VMnet port ioctl's */
825
826#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
827 defined(COMPAT_FREEBSD4)
828 case _IO('V', 0):
829 ival = IOCPARM_IVAL(data);
830 data = (caddr_t)&ival;
831 /* FALLTHROUGH */
832#endif
833 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */
834 f = *(int *)data;
835 f &= 0x0fff;
836 f &= ~IFF_CANTCHANGE;
837 f |= IFF_UP;
838
839 mtx_lock(&tp->tap_mtx);
840 ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE);
841 mtx_unlock(&tp->tap_mtx);
842 break;
843
844 case SIOCGIFADDR: /* get MAC address of the remote side */
845 mtx_lock(&tp->tap_mtx);
846 bcopy(tp->ether_addr, data, sizeof(tp->ether_addr));
847 mtx_unlock(&tp->tap_mtx);
848 break;
849
850 case SIOCSIFADDR: /* set MAC address of the remote side */
851 mtx_lock(&tp->tap_mtx);
852 bcopy(data, tp->ether_addr, sizeof(tp->ether_addr));
853 mtx_unlock(&tp->tap_mtx);
854 break;
855
856 default:
857 return (ENOTTY);
858 }
859 return (0);
860} /* tapioctl */
861
862
863/*
864 * tapread
865 *
866 * the cdevsw read interface - reads a packet at a time, or at
867 * least as much of a packet as can be read
868 */
869static int
870tapread(struct cdev *dev, struct uio *uio, int flag)
871{
872 struct tap_softc *tp = dev->si_drv1;
873 struct ifnet *ifp = tp->tap_ifp;
874 struct mbuf *m = NULL;
875 int error = 0, len;
876
877 TAPDEBUG("%s reading, minor = %#x\n", ifp->if_xname, dev2unit(dev));
878
879 mtx_lock(&tp->tap_mtx);
880 if ((tp->tap_flags & TAP_READY) != TAP_READY) {
881 mtx_unlock(&tp->tap_mtx);
882
883 /* Unlocked read. */
884 TAPDEBUG("%s not ready. minor = %#x, tap_flags = 0x%x\n",
885 ifp->if_xname, dev2unit(dev), tp->tap_flags);
886
887 return (EHOSTDOWN);
888 }
889
890 tp->tap_flags &= ~TAP_RWAIT;
891
892 /* sleep until we get a packet */
893 do {
894 IF_DEQUEUE(&ifp->if_snd, m);
895
896 if (m == NULL) {
897 if (flag & O_NONBLOCK) {
898 mtx_unlock(&tp->tap_mtx);
899 return (EWOULDBLOCK);
900 }
901
902 tp->tap_flags |= TAP_RWAIT;
903 error = mtx_sleep(tp, &tp->tap_mtx, PCATCH | (PZERO + 1),
904 "taprd", 0);
905 if (error) {
906 mtx_unlock(&tp->tap_mtx);
907 return (error);
908 }
909 }
910 } while (m == NULL);
911 mtx_unlock(&tp->tap_mtx);
912
913 /* feed packet to bpf */
914 BPF_MTAP(ifp, m);
915
916 /* xfer packet to user space */
917 while ((m != NULL) && (uio->uio_resid > 0) && (error == 0)) {
918 len = min(uio->uio_resid, m->m_len);
919 if (len == 0)
920 break;
921
922 error = uiomove(mtod(m, void *), len, uio);
923 m = m_free(m);
924 }
925
926 if (m != NULL) {
927 TAPDEBUG("%s dropping mbuf, minor = %#x\n", ifp->if_xname,
928 dev2unit(dev));
929 m_freem(m);
930 }
931
932 return (error);
933} /* tapread */
934
935
936/*
937 * tapwrite
938 *
939 * the cdevsw write interface - an atomic write is a packet - or else!
940 */
941static int
942tapwrite(struct cdev *dev, struct uio *uio, int flag)
943{
944 struct ether_header *eh;
945 struct tap_softc *tp = dev->si_drv1;
946 struct ifnet *ifp = tp->tap_ifp;
947 struct mbuf *m;
948
949 TAPDEBUG("%s writing, minor = %#x\n",
950 ifp->if_xname, dev2unit(dev));
951
952 if (uio->uio_resid == 0)
953 return (0);
954
955 if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) {
956 TAPDEBUG("%s invalid packet len = %zd, minor = %#x\n",
957 ifp->if_xname, uio->uio_resid, dev2unit(dev));
958
959 return (EIO);
960 }
961
962 if ((m = m_uiotombuf(uio, M_NOWAIT, 0, ETHER_ALIGN,
963 M_PKTHDR)) == NULL) {
964 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
965 return (ENOBUFS);
966 }
967
968 m->m_pkthdr.rcvif = ifp;
969
970 /*
971 * Only pass a unicast frame to ether_input(), if it would actually
972 * have been received by non-virtual hardware.
973 */
974 if (m->m_len < sizeof(struct ether_header)) {
975 m_freem(m);
976 return (0);
977 }
978 eh = mtod(m, struct ether_header *);
979
980 if (eh && (ifp->if_flags & IFF_PROMISC) == 0 &&
981 !ETHER_IS_MULTICAST(eh->ether_dhost) &&
982 bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) {
983 m_freem(m);
984 return (0);
985 }
986
987 /* Pass packet up to parent. */
988 CURVNET_SET(ifp->if_vnet);
989 (*ifp->if_input)(ifp, m);
990 CURVNET_RESTORE();
991 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); /* ibytes are counted in parent */
992
993 return (0);
994} /* tapwrite */
995
996
997/*
998 * tappoll
999 *
1000 * the poll interface, this is only useful on reads
1001 * really. the write detect always returns true, write never blocks
1002 * anyway, it either accepts the packet or drops it
1003 */
1004static int
1005tappoll(struct cdev *dev, int events, struct thread *td)
1006{
1007 struct tap_softc *tp = dev->si_drv1;
1008 struct ifnet *ifp = tp->tap_ifp;
1009 int revents = 0;
1010
1011 TAPDEBUG("%s polling, minor = %#x\n",
1012 ifp->if_xname, dev2unit(dev));
1013
1014 if (events & (POLLIN | POLLRDNORM)) {
1015 IFQ_LOCK(&ifp->if_snd);
1016 if (!IFQ_IS_EMPTY(&ifp->if_snd)) {
1017 TAPDEBUG("%s have data in queue. len = %d, " \
1018 "minor = %#x\n", ifp->if_xname,
1019 ifp->if_snd.ifq_len, dev2unit(dev));
1020
1021 revents |= (events & (POLLIN | POLLRDNORM));
1022 } else {
1023 TAPDEBUG("%s waiting for data, minor = %#x\n",
1024 ifp->if_xname, dev2unit(dev));
1025
1026 selrecord(td, &tp->tap_rsel);
1027 }
1028 IFQ_UNLOCK(&ifp->if_snd);
1029 }
1030
1031 if (events & (POLLOUT | POLLWRNORM))
1032 revents |= (events & (POLLOUT | POLLWRNORM));
1033
1034 return (revents);
1035} /* tappoll */
1036
1037
1038/*
1039 * tap_kqfilter
1040 *
1041 * support for kevent() system call
1042 */
1043static int
1044tapkqfilter(struct cdev *dev, struct knote *kn)
1045{
1046 struct tap_softc *tp = dev->si_drv1;
1047 struct ifnet *ifp = tp->tap_ifp;
1048
1049 switch (kn->kn_filter) {
1050 case EVFILT_READ:
1051 TAPDEBUG("%s kqfilter: EVFILT_READ, minor = %#x\n",
1052 ifp->if_xname, dev2unit(dev));
1053 kn->kn_fop = &tap_read_filterops;
1054 break;
1055
1056 case EVFILT_WRITE:
1057 TAPDEBUG("%s kqfilter: EVFILT_WRITE, minor = %#x\n",
1058 ifp->if_xname, dev2unit(dev));
1059 kn->kn_fop = &tap_write_filterops;
1060 break;
1061
1062 default:
1063 TAPDEBUG("%s kqfilter: invalid filter, minor = %#x\n",
1064 ifp->if_xname, dev2unit(dev));
1065 return (EINVAL);
1066 /* NOT REACHED */
1067 }
1068
1069 kn->kn_hook = tp;
1070 knlist_add(&tp->tap_rsel.si_note, kn, 0);
1071
1072 return (0);
1073} /* tapkqfilter */
1074
1075
1076/*
1077 * tap_kqread
1078 *
1079 * Return true if there is data in the interface queue
1080 */
1081static int
1082tapkqread(struct knote *kn, long hint)
1083{
1084 int ret;
1085 struct tap_softc *tp = kn->kn_hook;
1086 struct cdev *dev = tp->tap_dev;
1087 struct ifnet *ifp = tp->tap_ifp;
1088
1089 if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) {
1090 TAPDEBUG("%s have data in queue. len = %d, minor = %#x\n",
1091 ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev));
1092 ret = 1;
1093 } else {
1094 TAPDEBUG("%s waiting for data, minor = %#x\n",
1095 ifp->if_xname, dev2unit(dev));
1096 ret = 0;
1097 }
1098
1099 return (ret);
1100} /* tapkqread */
1101
1102
1103/*
1104 * tap_kqwrite
1105 *
1106 * Always can write. Return the MTU in kn->data
1107 */
1108static int
1109tapkqwrite(struct knote *kn, long hint)
1110{
1111 struct tap_softc *tp = kn->kn_hook;
1112 struct ifnet *ifp = tp->tap_ifp;
1113
1114 kn->kn_data = ifp->if_mtu;
1115
1116 return (1);
1117} /* tapkqwrite */
1118
1119
1120static void
1121tapkqdetach(struct knote *kn)
1122{
1123 struct tap_softc *tp = kn->kn_hook;
1124
1125 knlist_remove(&tp->tap_rsel.si_note, kn, 0);
1126} /* tapkqdetach */
1127
| 179
180static int
181tap_clone_create(struct if_clone *ifc, int unit, caddr_t params)
182{
183 struct cdev *dev;
184 int i;
185
186 /* Find any existing device, or allocate new unit number. */
187 i = clone_create(&tapclones, &tap_cdevsw, &unit, &dev, 0);
188 if (i) {
189 dev = make_dev(&tap_cdevsw, unit, UID_ROOT, GID_WHEEL, 0600,
190 "%s%d", tapname, unit);
191 }
192
193 tapcreate(dev);
194 return (0);
195}
196
197/* vmnet devices are tap devices in disguise */
198static int
199vmnet_clone_create(struct if_clone *ifc, int unit, caddr_t params)
200{
201 struct cdev *dev;
202 int i;
203
204 /* Find any existing device, or allocate new unit number. */
205 i = clone_create(&tapclones, &tap_cdevsw, &unit, &dev, VMNET_DEV_MASK);
206 if (i) {
207 dev = make_dev(&tap_cdevsw, unit | VMNET_DEV_MASK, UID_ROOT,
208 GID_WHEEL, 0600, "%s%d", vmnetname, unit);
209 }
210
211 tapcreate(dev);
212 return (0);
213}
214
215static void
216tap_destroy(struct tap_softc *tp)
217{
218 struct ifnet *ifp = tp->tap_ifp;
219
220 CURVNET_SET(ifp->if_vnet);
221 destroy_dev(tp->tap_dev);
222 seldrain(&tp->tap_rsel);
223 knlist_clear(&tp->tap_rsel.si_note, 0);
224 knlist_destroy(&tp->tap_rsel.si_note);
225 ether_ifdetach(ifp);
226 if_free(ifp);
227
228 mtx_destroy(&tp->tap_mtx);
229 free(tp, M_TAP);
230 CURVNET_RESTORE();
231}
232
233static void
234tap_clone_destroy(struct ifnet *ifp)
235{
236 struct tap_softc *tp = ifp->if_softc;
237
238 mtx_lock(&tapmtx);
239 SLIST_REMOVE(&taphead, tp, tap_softc, tap_next);
240 mtx_unlock(&tapmtx);
241 tap_destroy(tp);
242}
243
244/* vmnet devices are tap devices in disguise */
245static void
246vmnet_clone_destroy(struct ifnet *ifp)
247{
248 tap_clone_destroy(ifp);
249}
250
251/*
252 * tapmodevent
253 *
254 * module event handler
255 */
256static int
257tapmodevent(module_t mod, int type, void *data)
258{
259 static eventhandler_tag eh_tag = NULL;
260 struct tap_softc *tp = NULL;
261 struct ifnet *ifp = NULL;
262
263 switch (type) {
264 case MOD_LOAD:
265
266 /* intitialize device */
267
268 mtx_init(&tapmtx, "tapmtx", NULL, MTX_DEF);
269 SLIST_INIT(&taphead);
270
271 clone_setup(&tapclones);
272 eh_tag = EVENTHANDLER_REGISTER(dev_clone, tapclone, 0, 1000);
273 if (eh_tag == NULL) {
274 clone_cleanup(&tapclones);
275 mtx_destroy(&tapmtx);
276 return (ENOMEM);
277 }
278 tap_cloner = if_clone_simple(tapname, tap_clone_create,
279 tap_clone_destroy, 0);
280 vmnet_cloner = if_clone_simple(vmnetname, vmnet_clone_create,
281 vmnet_clone_destroy, 0);
282 return (0);
283
284 case MOD_UNLOAD:
285 /*
286 * The EBUSY algorithm here can't quite atomically
287 * guarantee that this is race-free since we have to
288 * release the tap mtx to deregister the clone handler.
289 */
290 mtx_lock(&tapmtx);
291 SLIST_FOREACH(tp, &taphead, tap_next) {
292 mtx_lock(&tp->tap_mtx);
293 if (tp->tap_flags & TAP_OPEN) {
294 mtx_unlock(&tp->tap_mtx);
295 mtx_unlock(&tapmtx);
296 return (EBUSY);
297 }
298 mtx_unlock(&tp->tap_mtx);
299 }
300 mtx_unlock(&tapmtx);
301
302 EVENTHANDLER_DEREGISTER(dev_clone, eh_tag);
303 if_clone_detach(tap_cloner);
304 if_clone_detach(vmnet_cloner);
305 drain_dev_clone_events();
306
307 mtx_lock(&tapmtx);
308 while ((tp = SLIST_FIRST(&taphead)) != NULL) {
309 SLIST_REMOVE_HEAD(&taphead, tap_next);
310 mtx_unlock(&tapmtx);
311
312 ifp = tp->tap_ifp;
313
314 TAPDEBUG("detaching %s\n", ifp->if_xname);
315
316 tap_destroy(tp);
317 mtx_lock(&tapmtx);
318 }
319 mtx_unlock(&tapmtx);
320 clone_cleanup(&tapclones);
321
322 mtx_destroy(&tapmtx);
323
324 break;
325
326 default:
327 return (EOPNOTSUPP);
328 }
329
330 return (0);
331} /* tapmodevent */
332
333
334/*
335 * DEVFS handler
336 *
337 * We need to support two kind of devices - tap and vmnet
338 */
339static void
340tapclone(void *arg, struct ucred *cred, char *name, int namelen, struct cdev **dev)
341{
342 char devname[SPECNAMELEN + 1];
343 int i, unit, append_unit;
344 int extra;
345
346 if (*dev != NULL)
347 return;
348
349 if (!tapdclone ||
350 (!tapuopen && priv_check_cred(cred, PRIV_NET_IFCREATE, 0) != 0))
351 return;
352
353 unit = 0;
354 append_unit = 0;
355 extra = 0;
356
357 /* We're interested in only tap/vmnet devices. */
358 if (strcmp(name, tapname) == 0) {
359 unit = -1;
360 } else if (strcmp(name, vmnetname) == 0) {
361 unit = -1;
362 extra = VMNET_DEV_MASK;
363 } else if (dev_stdclone(name, NULL, tapname, &unit) != 1) {
364 if (dev_stdclone(name, NULL, vmnetname, &unit) != 1) {
365 return;
366 } else {
367 extra = VMNET_DEV_MASK;
368 }
369 }
370
371 if (unit == -1)
372 append_unit = 1;
373
374 CURVNET_SET(CRED_TO_VNET(cred));
375 /* find any existing device, or allocate new unit number */
376 i = clone_create(&tapclones, &tap_cdevsw, &unit, dev, extra);
377 if (i) {
378 if (append_unit) {
379 /*
380 * We were passed 'tun' or 'tap', with no unit specified
381 * so we'll need to append it now.
382 */
383 namelen = snprintf(devname, sizeof(devname), "%s%d", name,
384 unit);
385 name = devname;
386 }
387
388 *dev = make_dev_credf(MAKEDEV_REF, &tap_cdevsw, unit | extra,
389 cred, UID_ROOT, GID_WHEEL, 0600, "%s", name);
390 }
391
392 if_clone_create(name, namelen, NULL);
393 CURVNET_RESTORE();
394} /* tapclone */
395
396
397/*
398 * tapcreate
399 *
400 * to create interface
401 */
402static void
403tapcreate(struct cdev *dev)
404{
405 struct ifnet *ifp = NULL;
406 struct tap_softc *tp = NULL;
407 unsigned short macaddr_hi;
408 uint32_t macaddr_mid;
409 int unit;
410 const char *name = NULL;
411 u_char eaddr[6];
412
413 /* allocate driver storage and create device */
414 tp = malloc(sizeof(*tp), M_TAP, M_WAITOK | M_ZERO);
415 mtx_init(&tp->tap_mtx, "tap_mtx", NULL, MTX_DEF);
416 mtx_lock(&tapmtx);
417 SLIST_INSERT_HEAD(&taphead, tp, tap_next);
418 mtx_unlock(&tapmtx);
419
420 unit = dev2unit(dev);
421
422 /* select device: tap or vmnet */
423 if (unit & VMNET_DEV_MASK) {
424 name = vmnetname;
425 tp->tap_flags |= TAP_VMNET;
426 } else
427 name = tapname;
428
429 unit &= TAPMAXUNIT;
430
431 TAPDEBUG("tapcreate(%s%d). minor = %#x\n", name, unit, dev2unit(dev));
432
433 /* generate fake MAC address: 00 bd xx xx xx unit_no */
434 macaddr_hi = htons(0x00bd);
435 macaddr_mid = (uint32_t) ticks;
436 bcopy(&macaddr_hi, eaddr, sizeof(short));
437 bcopy(&macaddr_mid, &eaddr[2], sizeof(uint32_t));
438 eaddr[5] = (u_char)unit;
439
440 /* fill the rest and attach interface */
441 ifp = tp->tap_ifp = if_alloc(IFT_ETHER);
442 if (ifp == NULL)
443 panic("%s%d: can not if_alloc()", name, unit);
444 ifp->if_softc = tp;
445 if_initname(ifp, name, unit);
446 ifp->if_init = tapifinit;
447 ifp->if_start = tapifstart;
448 ifp->if_ioctl = tapifioctl;
449 ifp->if_mtu = ETHERMTU;
450 ifp->if_flags = (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST);
451 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
452 ifp->if_capabilities |= IFCAP_LINKSTATE;
453 ifp->if_capenable |= IFCAP_LINKSTATE;
454
455 dev->si_drv1 = tp;
456 tp->tap_dev = dev;
457
458 ether_ifattach(ifp, eaddr);
459
460 mtx_lock(&tp->tap_mtx);
461 tp->tap_flags |= TAP_INITED;
462 mtx_unlock(&tp->tap_mtx);
463
464 knlist_init_mtx(&tp->tap_rsel.si_note, &tp->tap_mtx);
465
466 TAPDEBUG("interface %s is created. minor = %#x\n",
467 ifp->if_xname, dev2unit(dev));
468} /* tapcreate */
469
470
471/*
472 * tapopen
473 *
474 * to open tunnel. must be superuser
475 */
476static int
477tapopen(struct cdev *dev, int flag, int mode, struct thread *td)
478{
479 struct tap_softc *tp = NULL;
480 struct ifnet *ifp = NULL;
481 int error;
482
483 if (tapuopen == 0) {
484 error = priv_check(td, PRIV_NET_TAP);
485 if (error)
486 return (error);
487 }
488
489 if ((dev2unit(dev) & CLONE_UNITMASK) > TAPMAXUNIT)
490 return (ENXIO);
491
492 tp = dev->si_drv1;
493
494 mtx_lock(&tp->tap_mtx);
495 if (tp->tap_flags & TAP_OPEN) {
496 mtx_unlock(&tp->tap_mtx);
497 return (EBUSY);
498 }
499
500 bcopy(IF_LLADDR(tp->tap_ifp), tp->ether_addr, sizeof(tp->ether_addr));
501 tp->tap_pid = td->td_proc->p_pid;
502 tp->tap_flags |= TAP_OPEN;
503 ifp = tp->tap_ifp;
504
505 ifp->if_drv_flags |= IFF_DRV_RUNNING;
506 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
507 if (tapuponopen)
508 ifp->if_flags |= IFF_UP;
509 if_link_state_change(ifp, LINK_STATE_UP);
510 mtx_unlock(&tp->tap_mtx);
511
512 TAPDEBUG("%s is open. minor = %#x\n", ifp->if_xname, dev2unit(dev));
513
514 return (0);
515} /* tapopen */
516
517
518/*
519 * tapclose
520 *
521 * close the device - mark i/f down & delete routing info
522 */
523static int
524tapclose(struct cdev *dev, int foo, int bar, struct thread *td)
525{
526 struct ifaddr *ifa;
527 struct tap_softc *tp = dev->si_drv1;
528 struct ifnet *ifp = tp->tap_ifp;
529
530 /* junk all pending output */
531 mtx_lock(&tp->tap_mtx);
532 CURVNET_SET(ifp->if_vnet);
533 IF_DRAIN(&ifp->if_snd);
534
535 /*
536 * Do not bring the interface down, and do not anything with
537 * interface, if we are in VMnet mode. Just close the device.
538 */
539 if (((tp->tap_flags & TAP_VMNET) == 0) &&
540 (ifp->if_flags & (IFF_UP | IFF_LINK0)) == IFF_UP) {
541 mtx_unlock(&tp->tap_mtx);
542 if_down(ifp);
543 mtx_lock(&tp->tap_mtx);
544 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
545 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
546 mtx_unlock(&tp->tap_mtx);
547 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
548 rtinit(ifa, (int)RTM_DELETE, 0);
549 }
550 if_purgeaddrs(ifp);
551 mtx_lock(&tp->tap_mtx);
552 }
553 }
554
555 if_link_state_change(ifp, LINK_STATE_DOWN);
556 CURVNET_RESTORE();
557
558 funsetown(&tp->tap_sigio);
559 selwakeuppri(&tp->tap_rsel, PZERO+1);
560 KNOTE_LOCKED(&tp->tap_rsel.si_note, 0);
561
562 tp->tap_flags &= ~TAP_OPEN;
563 tp->tap_pid = 0;
564 mtx_unlock(&tp->tap_mtx);
565
566 TAPDEBUG("%s is closed. minor = %#x\n",
567 ifp->if_xname, dev2unit(dev));
568
569 return (0);
570} /* tapclose */
571
572
573/*
574 * tapifinit
575 *
576 * network interface initialization function
577 */
578static void
579tapifinit(void *xtp)
580{
581 struct tap_softc *tp = (struct tap_softc *)xtp;
582 struct ifnet *ifp = tp->tap_ifp;
583
584 TAPDEBUG("initializing %s\n", ifp->if_xname);
585
586 mtx_lock(&tp->tap_mtx);
587 ifp->if_drv_flags |= IFF_DRV_RUNNING;
588 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
589 mtx_unlock(&tp->tap_mtx);
590
591 /* attempt to start output */
592 tapifstart(ifp);
593} /* tapifinit */
594
595
596/*
597 * tapifioctl
598 *
599 * Process an ioctl request on network interface
600 */
601static int
602tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
603{
604 struct tap_softc *tp = ifp->if_softc;
605 struct ifreq *ifr = (struct ifreq *)data;
606 struct ifstat *ifs = NULL;
607 struct ifmediareq *ifmr = NULL;
608 int dummy, error = 0;
609
610 switch (cmd) {
611 case SIOCSIFFLAGS: /* XXX -- just like vmnet does */
612 case SIOCADDMULTI:
613 case SIOCDELMULTI:
614 break;
615
616 case SIOCGIFMEDIA:
617 ifmr = (struct ifmediareq *)data;
618 dummy = ifmr->ifm_count;
619 ifmr->ifm_count = 1;
620 ifmr->ifm_status = IFM_AVALID;
621 ifmr->ifm_active = IFM_ETHER;
622 if (tp->tap_flags & TAP_OPEN)
623 ifmr->ifm_status |= IFM_ACTIVE;
624 ifmr->ifm_current = ifmr->ifm_active;
625 if (dummy >= 1) {
626 int media = IFM_ETHER;
627 error = copyout(&media, ifmr->ifm_ulist,
628 sizeof(int));
629 }
630 break;
631
632 case SIOCSIFMTU:
633 ifp->if_mtu = ifr->ifr_mtu;
634 break;
635
636 case SIOCGIFSTATUS:
637 ifs = (struct ifstat *)data;
638 mtx_lock(&tp->tap_mtx);
639 if (tp->tap_pid != 0)
640 snprintf(ifs->ascii, sizeof(ifs->ascii),
641 "\tOpened by PID %d\n", tp->tap_pid);
642 else
643 ifs->ascii[0] = '\0';
644 mtx_unlock(&tp->tap_mtx);
645 break;
646
647 default:
648 error = ether_ioctl(ifp, cmd, data);
649 break;
650 }
651
652 return (error);
653} /* tapifioctl */
654
655
656/*
657 * tapifstart
658 *
659 * queue packets from higher level ready to put out
660 */
661static void
662tapifstart(struct ifnet *ifp)
663{
664 struct tap_softc *tp = ifp->if_softc;
665
666 TAPDEBUG("%s starting\n", ifp->if_xname);
667
668 /*
669 * do not junk pending output if we are in VMnet mode.
670 * XXX: can this do any harm because of queue overflow?
671 */
672
673 mtx_lock(&tp->tap_mtx);
674 if (((tp->tap_flags & TAP_VMNET) == 0) &&
675 ((tp->tap_flags & TAP_READY) != TAP_READY)) {
676 struct mbuf *m;
677
678 /* Unlocked read. */
679 TAPDEBUG("%s not ready, tap_flags = 0x%x\n", ifp->if_xname,
680 tp->tap_flags);
681
682 for (;;) {
683 IF_DEQUEUE(&ifp->if_snd, m);
684 if (m != NULL) {
685 m_freem(m);
686 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
687 } else
688 break;
689 }
690 mtx_unlock(&tp->tap_mtx);
691
692 return;
693 }
694
695 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
696
697 if (!IFQ_IS_EMPTY(&ifp->if_snd)) {
698 if (tp->tap_flags & TAP_RWAIT) {
699 tp->tap_flags &= ~TAP_RWAIT;
700 wakeup(tp);
701 }
702
703 if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) {
704 mtx_unlock(&tp->tap_mtx);
705 pgsigio(&tp->tap_sigio, SIGIO, 0);
706 mtx_lock(&tp->tap_mtx);
707 }
708
709 selwakeuppri(&tp->tap_rsel, PZERO+1);
710 KNOTE_LOCKED(&tp->tap_rsel.si_note, 0);
711 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); /* obytes are counted in ether_output */
712 }
713
714 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
715 mtx_unlock(&tp->tap_mtx);
716} /* tapifstart */
717
718
719/*
720 * tapioctl
721 *
722 * the cdevsw interface is now pretty minimal
723 */
724static int
725tapioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
726{
727 struct ifreq ifr;
728 struct tap_softc *tp = dev->si_drv1;
729 struct ifnet *ifp = tp->tap_ifp;
730 struct tapinfo *tapp = NULL;
731 int f;
732 int error;
733#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
734 defined(COMPAT_FREEBSD4)
735 int ival;
736#endif
737
738 switch (cmd) {
739 case TAPSIFINFO:
740 tapp = (struct tapinfo *)data;
741 if (ifp->if_type != tapp->type)
742 return (EPROTOTYPE);
743 mtx_lock(&tp->tap_mtx);
744 if (ifp->if_mtu != tapp->mtu) {
745 strncpy(ifr.ifr_name, if_name(ifp), IFNAMSIZ);
746 ifr.ifr_mtu = tapp->mtu;
747 CURVNET_SET(ifp->if_vnet);
748 error = ifhwioctl(SIOCSIFMTU, ifp,
749 (caddr_t)&ifr, td);
750 CURVNET_RESTORE();
751 if (error) {
752 mtx_unlock(&tp->tap_mtx);
753 return (error);
754 }
755 }
756 ifp->if_baudrate = tapp->baudrate;
757 mtx_unlock(&tp->tap_mtx);
758 break;
759
760 case TAPGIFINFO:
761 tapp = (struct tapinfo *)data;
762 mtx_lock(&tp->tap_mtx);
763 tapp->mtu = ifp->if_mtu;
764 tapp->type = ifp->if_type;
765 tapp->baudrate = ifp->if_baudrate;
766 mtx_unlock(&tp->tap_mtx);
767 break;
768
769 case TAPSDEBUG:
770 tapdebug = *(int *)data;
771 break;
772
773 case TAPGDEBUG:
774 *(int *)data = tapdebug;
775 break;
776
777 case TAPGIFNAME: {
778 struct ifreq *ifr = (struct ifreq *) data;
779
780 strlcpy(ifr->ifr_name, ifp->if_xname, IFNAMSIZ);
781 } break;
782
783 case FIONBIO:
784 break;
785
786 case FIOASYNC:
787 mtx_lock(&tp->tap_mtx);
788 if (*(int *)data)
789 tp->tap_flags |= TAP_ASYNC;
790 else
791 tp->tap_flags &= ~TAP_ASYNC;
792 mtx_unlock(&tp->tap_mtx);
793 break;
794
795 case FIONREAD:
796 if (!IFQ_IS_EMPTY(&ifp->if_snd)) {
797 struct mbuf *mb;
798
799 IFQ_LOCK(&ifp->if_snd);
800 IFQ_POLL_NOLOCK(&ifp->if_snd, mb);
801 for (*(int *)data = 0; mb != NULL;
802 mb = mb->m_next)
803 *(int *)data += mb->m_len;
804 IFQ_UNLOCK(&ifp->if_snd);
805 } else
806 *(int *)data = 0;
807 break;
808
809 case FIOSETOWN:
810 return (fsetown(*(int *)data, &tp->tap_sigio));
811
812 case FIOGETOWN:
813 *(int *)data = fgetown(&tp->tap_sigio);
814 return (0);
815
816 /* this is deprecated, FIOSETOWN should be used instead */
817 case TIOCSPGRP:
818 return (fsetown(-(*(int *)data), &tp->tap_sigio));
819
820 /* this is deprecated, FIOGETOWN should be used instead */
821 case TIOCGPGRP:
822 *(int *)data = -fgetown(&tp->tap_sigio);
823 return (0);
824
825 /* VMware/VMnet port ioctl's */
826
827#if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
828 defined(COMPAT_FREEBSD4)
829 case _IO('V', 0):
830 ival = IOCPARM_IVAL(data);
831 data = (caddr_t)&ival;
832 /* FALLTHROUGH */
833#endif
834 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */
835 f = *(int *)data;
836 f &= 0x0fff;
837 f &= ~IFF_CANTCHANGE;
838 f |= IFF_UP;
839
840 mtx_lock(&tp->tap_mtx);
841 ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE);
842 mtx_unlock(&tp->tap_mtx);
843 break;
844
845 case SIOCGIFADDR: /* get MAC address of the remote side */
846 mtx_lock(&tp->tap_mtx);
847 bcopy(tp->ether_addr, data, sizeof(tp->ether_addr));
848 mtx_unlock(&tp->tap_mtx);
849 break;
850
851 case SIOCSIFADDR: /* set MAC address of the remote side */
852 mtx_lock(&tp->tap_mtx);
853 bcopy(data, tp->ether_addr, sizeof(tp->ether_addr));
854 mtx_unlock(&tp->tap_mtx);
855 break;
856
857 default:
858 return (ENOTTY);
859 }
860 return (0);
861} /* tapioctl */
862
863
864/*
865 * tapread
866 *
867 * the cdevsw read interface - reads a packet at a time, or at
868 * least as much of a packet as can be read
869 */
870static int
871tapread(struct cdev *dev, struct uio *uio, int flag)
872{
873 struct tap_softc *tp = dev->si_drv1;
874 struct ifnet *ifp = tp->tap_ifp;
875 struct mbuf *m = NULL;
876 int error = 0, len;
877
878 TAPDEBUG("%s reading, minor = %#x\n", ifp->if_xname, dev2unit(dev));
879
880 mtx_lock(&tp->tap_mtx);
881 if ((tp->tap_flags & TAP_READY) != TAP_READY) {
882 mtx_unlock(&tp->tap_mtx);
883
884 /* Unlocked read. */
885 TAPDEBUG("%s not ready. minor = %#x, tap_flags = 0x%x\n",
886 ifp->if_xname, dev2unit(dev), tp->tap_flags);
887
888 return (EHOSTDOWN);
889 }
890
891 tp->tap_flags &= ~TAP_RWAIT;
892
893 /* sleep until we get a packet */
894 do {
895 IF_DEQUEUE(&ifp->if_snd, m);
896
897 if (m == NULL) {
898 if (flag & O_NONBLOCK) {
899 mtx_unlock(&tp->tap_mtx);
900 return (EWOULDBLOCK);
901 }
902
903 tp->tap_flags |= TAP_RWAIT;
904 error = mtx_sleep(tp, &tp->tap_mtx, PCATCH | (PZERO + 1),
905 "taprd", 0);
906 if (error) {
907 mtx_unlock(&tp->tap_mtx);
908 return (error);
909 }
910 }
911 } while (m == NULL);
912 mtx_unlock(&tp->tap_mtx);
913
914 /* feed packet to bpf */
915 BPF_MTAP(ifp, m);
916
917 /* xfer packet to user space */
918 while ((m != NULL) && (uio->uio_resid > 0) && (error == 0)) {
919 len = min(uio->uio_resid, m->m_len);
920 if (len == 0)
921 break;
922
923 error = uiomove(mtod(m, void *), len, uio);
924 m = m_free(m);
925 }
926
927 if (m != NULL) {
928 TAPDEBUG("%s dropping mbuf, minor = %#x\n", ifp->if_xname,
929 dev2unit(dev));
930 m_freem(m);
931 }
932
933 return (error);
934} /* tapread */
935
936
937/*
938 * tapwrite
939 *
940 * the cdevsw write interface - an atomic write is a packet - or else!
941 */
942static int
943tapwrite(struct cdev *dev, struct uio *uio, int flag)
944{
945 struct ether_header *eh;
946 struct tap_softc *tp = dev->si_drv1;
947 struct ifnet *ifp = tp->tap_ifp;
948 struct mbuf *m;
949
950 TAPDEBUG("%s writing, minor = %#x\n",
951 ifp->if_xname, dev2unit(dev));
952
953 if (uio->uio_resid == 0)
954 return (0);
955
956 if ((uio->uio_resid < 0) || (uio->uio_resid > TAPMRU)) {
957 TAPDEBUG("%s invalid packet len = %zd, minor = %#x\n",
958 ifp->if_xname, uio->uio_resid, dev2unit(dev));
959
960 return (EIO);
961 }
962
963 if ((m = m_uiotombuf(uio, M_NOWAIT, 0, ETHER_ALIGN,
964 M_PKTHDR)) == NULL) {
965 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
966 return (ENOBUFS);
967 }
968
969 m->m_pkthdr.rcvif = ifp;
970
971 /*
972 * Only pass a unicast frame to ether_input(), if it would actually
973 * have been received by non-virtual hardware.
974 */
975 if (m->m_len < sizeof(struct ether_header)) {
976 m_freem(m);
977 return (0);
978 }
979 eh = mtod(m, struct ether_header *);
980
981 if (eh && (ifp->if_flags & IFF_PROMISC) == 0 &&
982 !ETHER_IS_MULTICAST(eh->ether_dhost) &&
983 bcmp(eh->ether_dhost, IF_LLADDR(ifp), ETHER_ADDR_LEN) != 0) {
984 m_freem(m);
985 return (0);
986 }
987
988 /* Pass packet up to parent. */
989 CURVNET_SET(ifp->if_vnet);
990 (*ifp->if_input)(ifp, m);
991 CURVNET_RESTORE();
992 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); /* ibytes are counted in parent */
993
994 return (0);
995} /* tapwrite */
996
997
998/*
999 * tappoll
1000 *
1001 * the poll interface, this is only useful on reads
1002 * really. the write detect always returns true, write never blocks
1003 * anyway, it either accepts the packet or drops it
1004 */
1005static int
1006tappoll(struct cdev *dev, int events, struct thread *td)
1007{
1008 struct tap_softc *tp = dev->si_drv1;
1009 struct ifnet *ifp = tp->tap_ifp;
1010 int revents = 0;
1011
1012 TAPDEBUG("%s polling, minor = %#x\n",
1013 ifp->if_xname, dev2unit(dev));
1014
1015 if (events & (POLLIN | POLLRDNORM)) {
1016 IFQ_LOCK(&ifp->if_snd);
1017 if (!IFQ_IS_EMPTY(&ifp->if_snd)) {
1018 TAPDEBUG("%s have data in queue. len = %d, " \
1019 "minor = %#x\n", ifp->if_xname,
1020 ifp->if_snd.ifq_len, dev2unit(dev));
1021
1022 revents |= (events & (POLLIN | POLLRDNORM));
1023 } else {
1024 TAPDEBUG("%s waiting for data, minor = %#x\n",
1025 ifp->if_xname, dev2unit(dev));
1026
1027 selrecord(td, &tp->tap_rsel);
1028 }
1029 IFQ_UNLOCK(&ifp->if_snd);
1030 }
1031
1032 if (events & (POLLOUT | POLLWRNORM))
1033 revents |= (events & (POLLOUT | POLLWRNORM));
1034
1035 return (revents);
1036} /* tappoll */
1037
1038
1039/*
1040 * tap_kqfilter
1041 *
1042 * support for kevent() system call
1043 */
1044static int
1045tapkqfilter(struct cdev *dev, struct knote *kn)
1046{
1047 struct tap_softc *tp = dev->si_drv1;
1048 struct ifnet *ifp = tp->tap_ifp;
1049
1050 switch (kn->kn_filter) {
1051 case EVFILT_READ:
1052 TAPDEBUG("%s kqfilter: EVFILT_READ, minor = %#x\n",
1053 ifp->if_xname, dev2unit(dev));
1054 kn->kn_fop = &tap_read_filterops;
1055 break;
1056
1057 case EVFILT_WRITE:
1058 TAPDEBUG("%s kqfilter: EVFILT_WRITE, minor = %#x\n",
1059 ifp->if_xname, dev2unit(dev));
1060 kn->kn_fop = &tap_write_filterops;
1061 break;
1062
1063 default:
1064 TAPDEBUG("%s kqfilter: invalid filter, minor = %#x\n",
1065 ifp->if_xname, dev2unit(dev));
1066 return (EINVAL);
1067 /* NOT REACHED */
1068 }
1069
1070 kn->kn_hook = tp;
1071 knlist_add(&tp->tap_rsel.si_note, kn, 0);
1072
1073 return (0);
1074} /* tapkqfilter */
1075
1076
1077/*
1078 * tap_kqread
1079 *
1080 * Return true if there is data in the interface queue
1081 */
1082static int
1083tapkqread(struct knote *kn, long hint)
1084{
1085 int ret;
1086 struct tap_softc *tp = kn->kn_hook;
1087 struct cdev *dev = tp->tap_dev;
1088 struct ifnet *ifp = tp->tap_ifp;
1089
1090 if ((kn->kn_data = ifp->if_snd.ifq_len) > 0) {
1091 TAPDEBUG("%s have data in queue. len = %d, minor = %#x\n",
1092 ifp->if_xname, ifp->if_snd.ifq_len, dev2unit(dev));
1093 ret = 1;
1094 } else {
1095 TAPDEBUG("%s waiting for data, minor = %#x\n",
1096 ifp->if_xname, dev2unit(dev));
1097 ret = 0;
1098 }
1099
1100 return (ret);
1101} /* tapkqread */
1102
1103
1104/*
1105 * tap_kqwrite
1106 *
1107 * Always can write. Return the MTU in kn->data
1108 */
1109static int
1110tapkqwrite(struct knote *kn, long hint)
1111{
1112 struct tap_softc *tp = kn->kn_hook;
1113 struct ifnet *ifp = tp->tap_ifp;
1114
1115 kn->kn_data = ifp->if_mtu;
1116
1117 return (1);
1118} /* tapkqwrite */
1119
1120
1121static void
1122tapkqdetach(struct knote *kn)
1123{
1124 struct tap_softc *tp = kn->kn_hook;
1125
1126 knlist_remove(&tp->tap_rsel.si_note, kn, 0);
1127} /* tapkqdetach */
1128
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