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kernel - Order ipfw3 module before other ipfw3_* modules
[dragonfly.git] / sys / net / tap / if_tap.c
blob5fb75258cc1c8c01f59192160c355f6c1b292f02
1 /*
2 * Copyright (C) 1999-2000 by Maksim Yevmenkin <m_evmenkin@yahoo.com>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * BASED ON:
27 * -------------------------------------------------------------------------
28 *
29 * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk>
30 * Nottingham University 1987.
31 */
32
33 /*
34 * $FreeBSD: src/sys/net/if_tap.c,v 1.3.2.3 2002/04/14 21:41:48 luigi Exp $
35 * $Id: if_tap.c,v 0.21 2000/07/23 21:46:02 max Exp $
36 */
37
38 #include "opt_inet.h"
39 #include "use_tap.h"
40
41 #include <sys/param.h>
42 #include <sys/conf.h>
43 #include <sys/device.h>
44 #include <sys/filedesc.h>
45 #include <sys/filio.h>
46 #include <sys/kernel.h>
47 #include <sys/malloc.h>
48 #include <sys/mbuf.h>
49 #include <sys/proc.h>
50 #include <sys/priv.h>
51 #include <sys/signalvar.h>
52 #include <sys/socket.h>
53 #include <sys/sockio.h>
54 #include <sys/sysctl.h>
55 #include <sys/systm.h>
56 #include <sys/ttycom.h>
57 #include <sys/uio.h>
58 #include <sys/vnode.h>
59 #include <sys/serialize.h>
60
61 #include <sys/thread2.h>
62 #include <sys/mplock2.h>
63
64 #include <net/bpf.h>
65 #include <net/ethernet.h>
66 #include <net/if.h>
67 #include <net/ifq_var.h>
68 #include <net/if_arp.h>
69 #include <net/if_clone.h>
70 #include <net/if_media.h>
71 #include <net/route.h>
72 #include <sys/devfs.h>
73
74 #include <netinet/in.h>
75
76 #include "if_tapvar.h"
77 #include "if_tap.h"
78
79 #define TAP_IFFLAGS (IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST)
80
81 #if NTAP <= 1
82 #define TAP_PREALLOCATED_UNITS 4
83 #else
84 #define TAP_PREALLOCATED_UNITS NTAP
85 #endif
86
87 #define CDEV_NAME "tap"
88 #define TAPDEBUG if (tapdebug) if_printf
89
90 #define TAP "tap"
91 #define VMNET "vmnet"
92 #define VMNET_DEV_MASK 0x00010000
93
94 DEVFS_DEFINE_CLONE_BITMAP(tap);
95
96 /* module */
97 static int tapmodevent (module_t, int, void *);
98
99 /* device */
100 static struct tap_softc *tapcreate(int, cdev_t, int);
101 static void tapdestroy(struct tap_softc *);
102
103 /* clone */
104 static int tap_clone_create(struct if_clone *, int, caddr_t);
105 static int tap_clone_destroy(struct ifnet *);
106
107
108 /* network interface */
109 static void tapifstart (struct ifnet *,
110 struct ifaltq_subque *);
111 static int tapifioctl (struct ifnet *, u_long, caddr_t,
112 struct ucred *);
113 static void tapifinit (void *);
114 static void tapifstop(struct tap_softc *, int);
115 static void tapifflags(struct tap_softc *);
116
117
118 /* character device */
119 static d_open_t tapopen;
120 static d_clone_t tapclone;
121 static d_close_t tapclose;
122 static d_read_t tapread;
123 static d_write_t tapwrite;
124 static d_ioctl_t tapioctl;
125 static d_kqfilter_t tapkqfilter;
126
127 static struct dev_ops tap_ops = {
128 { CDEV_NAME, 0, 0 },
129 .d_open = tapopen,
130 .d_close = tapclose,
131 .d_read = tapread,
132 .d_write = tapwrite,
133 .d_ioctl = tapioctl,
134 .d_kqfilter = tapkqfilter
135 };
136
137 static int taprefcnt = 0; /* module ref. counter */
138 static int taplastunit = -1; /* max. open unit number */
139 static int tapdebug = 0; /* debug flag */
140 static int tapuopen = 0; /* all user open() */
141 static int tapuponopen = 0; /* IFF_UP */
142
143 MALLOC_DECLARE(M_TAP);
144 MALLOC_DEFINE(M_TAP, CDEV_NAME, "Ethernet tunnel interface");
145 struct if_clone tap_cloner = IF_CLONE_INITIALIZER("tap",
146 tap_clone_create, tap_clone_destroy,
147 0, IF_MAXUNIT);
148 static SLIST_HEAD(,tap_softc) tap_listhead =
149 SLIST_HEAD_INITIALIZER(&tap_listhead);
150
151 SYSCTL_INT(_debug, OID_AUTO, if_tap_debug, CTLFLAG_RW, &tapdebug, 0, "");
152 SYSCTL_DECL(_net_link);
153 SYSCTL_NODE(_net_link, OID_AUTO, tap, CTLFLAG_RW, 0,
154 "Ethernet tunnel software network interface");
155 SYSCTL_INT(_net_link_tap, OID_AUTO, user_open, CTLFLAG_RW, &tapuopen, 0,
156 "Allow user to open /dev/tap (based on node permissions)");
157 SYSCTL_INT(_net_link_tap, OID_AUTO, up_on_open, CTLFLAG_RW, &tapuponopen, 0,
158 "Bring interface up when /dev/tap is opened");
159 SYSCTL_INT(_net_link_tap, OID_AUTO, debug, CTLFLAG_RW, &tapdebug, 0, "");
160
161 DEV_MODULE(if_tap, tapmodevent, NULL);
162
163 /*
164 * tapmodevent
165 *
166 * module event handler
167 */
168 static int
169 tapmodevent(module_t mod, int type, void *data)
170 {
171 static int attached = 0;
172 struct tap_softc *tp, *ntp;
173 int i;
174
175 switch (type) {
176 case MOD_LOAD:
177 if (attached)
178 return (EEXIST);
179
180 make_autoclone_dev(&tap_ops, &DEVFS_CLONE_BITMAP(tap), tapclone,
181 UID_ROOT, GID_WHEEL, 0600, "tap");
182 SLIST_INIT(&tap_listhead);
183 if_clone_attach(&tap_cloner);
184
185 for (i = 0; i < TAP_PREALLOCATED_UNITS; ++i) {
186 make_dev(&tap_ops, i, UID_ROOT, GID_WHEEL,
187 0600, "tap%d", i);
188 devfs_clone_bitmap_set(&DEVFS_CLONE_BITMAP(tap), i);
189 }
190
191 attached = 1;
192 break;
193
194 case MOD_UNLOAD:
195 if (taprefcnt > 0)
196 return (EBUSY);
197
198 if_clone_detach(&tap_cloner);
199
200 /* Maintain tap ifs in a local list */
201 SLIST_FOREACH_MUTABLE(tp, &tap_listhead, tap_link, ntp)
202 tapdestroy(tp);
203
204 attached = 0;
205
206 devfs_clone_handler_del("tap");
207 dev_ops_remove_all(&tap_ops);
208 devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(tap));
209 break;
210
211 default:
212 return (EOPNOTSUPP);
213 }
214
215 return (0);
216 } /* tapmodevent */
217
218
219 /*
220 * tapcreate - create or clone an interface
221 */
222 static struct tap_softc *
223 tapcreate(int unit, cdev_t dev, int flags)
224 {
225 const char *name = TAP;
226 struct ifnet *ifp;
227 struct tap_softc *tp;
228 uint8_t ether_addr[ETHER_ADDR_LEN];
229
230 tp = kmalloc(sizeof(*tp), M_TAP, M_WAITOK | M_ZERO);
231 dev->si_drv1 = tp;
232 tp->tap_dev = dev;
233 tp->tap_unit = unit;
234 tp->tap_flags |= flags;
235
236 reference_dev(dev); /* tp association */
237
238 /* generate fake MAC address: 00 bd xx xx xx unit_no */
239 ether_addr[0] = 0x00;
240 ether_addr[1] = 0xbd;
241 bcopy(&ticks, &ether_addr[2], 3);
242 ether_addr[5] = (u_char)unit;
243
244 /* fill the rest and attach interface */
245 ifp = &tp->tap_if;
246 ifp->if_softc = tp;
247
248 if_initname(ifp, name, unit);
249 if (unit > taplastunit)
250 taplastunit = unit;
251
252 ifp->if_init = tapifinit;
253 ifp->if_start = tapifstart;
254 ifp->if_ioctl = tapifioctl;
255 ifp->if_mtu = ETHERMTU;
256 ifp->if_flags = TAP_IFFLAGS;
257 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
258 ifq_set_ready(&ifp->if_snd);
259
260 ether_ifattach(ifp, ether_addr, NULL);
261
262 tp->tap_flags |= TAP_INITED;
263 tp->tap_devq.ifq_maxlen = ifqmaxlen;
264
265 SLIST_INSERT_HEAD(&tap_listhead, tp, tap_link);
266
267 TAPDEBUG(ifp, "created. minor = %#x\n", minor(dev));
268 return (tp);
269 }
270
271 static
272 struct tap_softc *
273 tapfind(int unit)
274 {
275 struct tap_softc *tp;
276
277 SLIST_FOREACH(tp, &tap_listhead, tap_link) {
278 if (tp->tap_unit == unit)
279 return(tp);
280 }
281 return (NULL);
282 }
283
284 /*
285 * tap_clone_create:
286 *
287 * Create a new tap instance via ifconfig.
288 */
289 static int
290 tap_clone_create(struct if_clone *ifc __unused, int unit,
291 caddr_t param __unused)
292 {
293 struct tap_softc *tp;
294 cdev_t dev;
295
296 tp = tapfind(unit);
297 if (tp == NULL) {
298 if (!devfs_clone_bitmap_chk(&DEVFS_CLONE_BITMAP(tap), unit)) {
299 devfs_clone_bitmap_set(&DEVFS_CLONE_BITMAP(tap), unit);
300 dev = make_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL,
301 0600, "%s%d", TAP, unit);
302 } else {
303 dev = devfs_find_device_by_name("%s%d", TAP, unit);
304 }
305
306 KKASSERT(dev != NULL);
307 tp = tapcreate(unit, dev, TAP_MANUALMAKE);
308 }
309 tp->tap_flags |= TAP_CLONE;
310 TAPDEBUG(&tp->tap_if, "clone created. minor = %#x tap_flags = 0x%x\n",
311 minor(tp->tap_dev), tp->tap_flags);
312
313 return (0);
314 }
315
316 /*
317 * tapopen
318 *
319 * to open tunnel. must be superuser
320 */
321 static int
322 tapopen(struct dev_open_args *ap)
323 {
324 cdev_t dev = NULL;
325 struct tap_softc *tp = NULL;
326 struct ifnet *ifp = NULL;
327 int error;
328
329 if (tapuopen == 0 &&
330 (error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) != 0)
331 return (error);
332
333 get_mplock();
334 dev = ap->a_head.a_dev;
335 tp = dev->si_drv1;
336 if (tp == NULL)
337 tp = tapcreate(minor(dev), dev, TAP_MANUALMAKE);
338 if (tp->tap_flags & TAP_OPEN) {
339 rel_mplock();
340 return (EBUSY);
341 }
342 ifp = &tp->arpcom.ac_if;
343
344 if ((tp->tap_flags & TAP_CLONE) == 0) {
345 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
346
347 /* Announce the return of the interface. */
348 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
349 }
350
351 bcopy(tp->arpcom.ac_enaddr, tp->ether_addr, sizeof(tp->ether_addr));
352
353 if (curthread->td_proc)
354 fsetown(curthread->td_proc->p_pid, &tp->tap_sigtd);
355 tp->tap_flags |= TAP_OPEN;
356 taprefcnt ++;
357
358 if (tapuponopen && (ifp->if_flags & IFF_UP) == 0) {
359 crit_enter();
360 if_up(ifp);
361 crit_exit();
362
363 ifnet_serialize_all(ifp);
364 tapifflags(tp);
365 ifnet_deserialize_all(ifp);
366
367 tp->tap_flags |= TAP_CLOSEDOWN;
368 }
369
370 TAPDEBUG(ifp, "opened. minor = %#x, refcnt = %d, taplastunit = %d\n",
371 minor(tp->tap_dev), taprefcnt, taplastunit);
372
373 rel_mplock();
374 return (0);
375 }
376
377 static int
378 tapclone(struct dev_clone_args *ap)
379 {
380 int unit;
381
382 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(tap), 0);
383 ap->a_dev = make_only_dev(&tap_ops, unit, UID_ROOT, GID_WHEEL,
384 0600, "%s%d", TAP, unit);
385 tapcreate(unit, ap->a_dev, 0);
386 return (0);
387 }
388
389 /*
390 * tapclose
391 *
392 * close the device - mark i/f down & delete routing info
393 */
394 static int
395 tapclose(struct dev_close_args *ap)
396 {
397 cdev_t dev = ap->a_head.a_dev;
398 struct tap_softc *tp = dev->si_drv1;
399 struct ifnet *ifp = &tp->tap_if;
400 int clear_flags = 0;
401
402 get_mplock();
403
404 /* Junk all pending output */
405 ifq_purge_all(&ifp->if_snd);
406
407 /*
408 * Do not bring the interface down, and do not anything with
409 * interface, if we are in VMnet mode. just close the device.
410 *
411 * If the interface is not cloned, we always bring it down.
412 *
413 * If the interface is cloned, then we bring it down during
414 * closing only if it was brought up during opening.
415 */
416 if ((tp->tap_flags & TAP_VMNET) == 0 &&
417 ((tp->tap_flags & TAP_CLONE) == 0 ||
418 (tp->tap_flags & TAP_CLOSEDOWN))) {
419 if (ifp->if_flags & IFF_UP)
420 if_down(ifp);
421 clear_flags = 1;
422 }
423 ifnet_serialize_all(ifp);
424 tapifstop(tp, clear_flags);
425 ifnet_deserialize_all(ifp);
426
427 if ((tp->tap_flags & TAP_CLONE) == 0) {
428 if_purgeaddrs_nolink(ifp);
429
430 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
431
432 /* Announce the departure of the interface. */
433 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
434 }
435
436 funsetown(&tp->tap_sigio);
437 tp->tap_sigio = NULL;
438 KNOTE(&tp->tap_rkq.ki_note, 0);
439
440 tp->tap_flags &= ~TAP_OPEN;
441 funsetown(&tp->tap_sigtd);
442 tp->tap_sigtd = NULL;
443
444 taprefcnt --;
445 if (taprefcnt < 0) {
446 taprefcnt = 0;
447 if_printf(ifp, "minor = %#x, refcnt = %d is out of sync. "
448 "set refcnt to 0\n", minor(tp->tap_dev), taprefcnt);
449 }
450
451 TAPDEBUG(ifp, "closed. minor = %#x, refcnt = %d, taplastunit = %d\n",
452 minor(tp->tap_dev), taprefcnt, taplastunit);
453
454 /*
455 * Only auto-destroy if the interface was not manually
456 * created.
457 */
458 if ((tp->tap_flags & TAP_MANUALMAKE) == 0 &&
459 tp->tap_unit >= TAP_PREALLOCATED_UNITS) {
460 tapdestroy(tp);
461 }
462
463 rel_mplock();
464 return (0);
465 }
466
467 /*
468 * tapdestroy:
469 *
470 * Destroy a tap instance.
471 */
472 static void
473 tapdestroy(struct tap_softc *tp)
474 {
475 struct ifnet *ifp = &tp->arpcom.ac_if;
476 cdev_t dev;
477
478 TAPDEBUG(ifp, "destroyed. minor = %#x, refcnt = %d, taplastunit = %d\n",
479 minor(tp->tap_dev), taprefcnt, taplastunit);
480
481 ifnet_serialize_all(ifp);
482 tapifstop(tp, 1);
483 ifnet_deserialize_all(ifp);
484
485 ether_ifdetach(ifp);
486 SLIST_REMOVE(&tap_listhead, tp, tap_softc, tap_link);
487
488 dev = tp->tap_dev;
489 tp->tap_dev = NULL;
490 dev->si_drv1 = NULL;
491
492 release_dev(dev); /* tp association */
493
494 /*
495 * Also destroy the cloned device
496 */
497 if (tp->tap_unit >= TAP_PREALLOCATED_UNITS) {
498 destroy_dev(dev);
499 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(tap), tp->tap_unit);
500 }
501
502 kfree(tp, M_TAP);
503
504 taplastunit--;
505 }
506
507 /*
508 * tap_clone_destroy:
509 *
510 * Destroy a tap instance.
511 */
512 static int
513 tap_clone_destroy(struct ifnet *ifp)
514 {
515 struct tap_softc *tp = ifp->if_softc;
516
517 if ((tp->tap_flags & TAP_CLONE) == 0)
518 return ENXIO;
519
520 TAPDEBUG(&tp->tap_if, "clone destroyed. minor = %#x tap_flags = 0x%x\n",
521 minor(tp->tap_dev), tp->tap_flags);
522 tapdestroy(tp);
523
524 return 0;
525 }
526
527 /*
528 * tapifinit
529 *
530 * Network interface initialization function (called with if serializer held)
531 *
532 * MPSAFE
533 */
534 static void
535 tapifinit(void *xtp)
536 {
537 struct tap_softc *tp = xtp;
538 struct ifnet *ifp = &tp->tap_if;
539 struct ifaltq_subque *ifsq = ifq_get_subq_default(&ifp->if_snd);
540
541 TAPDEBUG(ifp, "initializing, minor = %#x tap_flags = 0x%x\n",
542 minor(tp->tap_dev), tp->tap_flags);
543
544 ASSERT_IFNET_SERIALIZED_ALL(ifp);
545
546 tapifstop(tp, 1);
547
548 ifp->if_flags |= IFF_RUNNING;
549 ifsq_clr_oactive(ifsq);
550
551 /* attempt to start output */
552 tapifstart(ifp, ifsq);
553 }
554
555
556 /*
557 * tapifioctl
558 *
559 * Process an ioctl request on network interface (called with if serializer
560 * held).
561 *
562 * MPSAFE
563 */
564 static int
565 tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
566 {
567 struct tap_softc *tp = (struct tap_softc *)(ifp->if_softc);
568 struct ifstat *ifs = NULL;
569 struct ifmediareq *ifmr = NULL;
570 int error = 0;
571 int dummy;
572
573 switch (cmd) {
574 case SIOCSIFADDR:
575 case SIOCGIFADDR:
576 case SIOCSIFMTU:
577 error = ether_ioctl(ifp, cmd, data);
578 break;
579
580 case SIOCSIFFLAGS:
581 tapifflags(tp);
582 break;
583
584 case SIOCADDMULTI: /* XXX -- just like vmnet does */
585 case SIOCDELMULTI:
586 break;
587
588 case SIOCGIFMEDIA:
589 /*
590 * The bridge code needs this when running the
591 * spanning tree protocol.
592 */
593 ifmr = (struct ifmediareq *)data;
594 dummy = ifmr->ifm_count;
595 ifmr->ifm_count = 1;
596 ifmr->ifm_status = IFM_AVALID;
597 ifmr->ifm_active = IFM_ETHER;
598 if (tp->tap_flags & TAP_OPEN)
599 ifmr->ifm_status |= IFM_ACTIVE;
600 ifmr->ifm_current = ifmr->ifm_active;
601 if (dummy >= 1) {
602 int media = IFM_ETHER;
603 error = copyout(&media,
604 ifmr->ifm_ulist,
605 sizeof(int));
606 }
607 break;
608
609 case SIOCGIFSTATUS:
610 ifs = (struct ifstat *)data;
611 dummy = strlen(ifs->ascii);
612 if ((tp->tap_flags & TAP_OPEN) &&
613 dummy < sizeof(ifs->ascii)) {
614 if (tp->tap_sigtd && tp->tap_sigtd->sio_proc) {
615 ksnprintf(ifs->ascii + dummy,
616 sizeof(ifs->ascii) - dummy,
617 "\tOpened by pid %d\n",
618 (int)tp->tap_sigtd->sio_proc->p_pid);
619 } else {
620 ksnprintf(ifs->ascii + dummy,
621 sizeof(ifs->ascii) - dummy,
622 "\tOpened by <unknown>\n");
623 }
624 }
625 break;
626
627 default:
628 error = EINVAL;
629 break;
630 }
631
632 return (error);
633 }
634
635
636 /*
637 * tapifstart
638 *
639 * Queue packets from higher level ready to put out (called with if serializer
640 * held)
641 *
642 * MPSAFE
643 */
644 static void
645 tapifstart(struct ifnet *ifp, struct ifaltq_subque *ifsq)
646 {
647 struct tap_softc *tp = ifp->if_softc;
648 struct ifqueue *ifq;
649 struct mbuf *m;
650 int has_data = 0;
651
652 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq);
653 TAPDEBUG(ifp, "starting, minor = %#x\n", minor(tp->tap_dev));
654
655 /*
656 * do not junk pending output if we are in VMnet mode.
657 * XXX: can this do any harm because of queue overflow?
658 */
659
660 if (((tp->tap_flags & TAP_VMNET) == 0) &&
661 ((tp->tap_flags & TAP_READY) != TAP_READY)) {
662 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
663 minor(tp->tap_dev), tp->tap_flags);
664 ifsq_purge(ifsq);
665 return;
666 }
667
668 ifsq_set_oactive(ifsq);
669
670 ifq = &tp->tap_devq;
671 while ((m = ifsq_dequeue(ifsq)) != NULL) {
672 if (IF_QFULL(ifq)) {
673 IF_DROP(ifq);
674 IFNET_STAT_INC(ifp, oerrors, 1);
675 m_freem(m);
676 } else {
677 IF_ENQUEUE(ifq, m);
678 IFNET_STAT_INC(ifp, opackets, 1);
679 has_data = 1;
680 }
681 }
682
683 if (has_data) {
684 if (tp->tap_flags & TAP_RWAIT) {
685 tp->tap_flags &= ~TAP_RWAIT;
686 wakeup((caddr_t)tp);
687 }
688
689 KNOTE(&tp->tap_rkq.ki_note, 0);
690
691 if ((tp->tap_flags & TAP_ASYNC) && (tp->tap_sigio != NULL)) {
692 get_mplock();
693 pgsigio(tp->tap_sigio, SIGIO, 0);
694 rel_mplock();
695 }
696 }
697
698 ifsq_clr_oactive(ifsq);
699 }
700
701
702 /*
703 * tapioctl
704 *
705 * The ops interface is now pretty minimal. Called via fileops with nothing
706 * held.
707 *
708 * MPSAFE
709 */
710 static int
711 tapioctl(struct dev_ioctl_args *ap)
712 {
713 cdev_t dev = ap->a_head.a_dev;
714 caddr_t data = ap->a_data;
715 struct tap_softc *tp = dev->si_drv1;
716 struct ifnet *ifp = &tp->tap_if;
717 struct tapinfo *tapp = NULL;
718 struct mbuf *mb;
719 short f;
720 int error;
721
722 ifnet_serialize_all(ifp);
723 error = 0;
724
725 switch (ap->a_cmd) {
726 case TAPSIFINFO:
727 tapp = (struct tapinfo *)data;
728 ifp->if_mtu = tapp->mtu;
729 ifp->if_type = tapp->type;
730 ifp->if_baudrate = tapp->baudrate;
731 break;
732
733 case TAPGIFINFO:
734 tapp = (struct tapinfo *)data;
735 tapp->mtu = ifp->if_mtu;
736 tapp->type = ifp->if_type;
737 tapp->baudrate = ifp->if_baudrate;
738 break;
739
740 case TAPSDEBUG:
741 tapdebug = *(int *)data;
742 break;
743
744 case TAPGDEBUG:
745 *(int *)data = tapdebug;
746 break;
747
748 case FIOASYNC:
749 if (*(int *)data)
750 tp->tap_flags |= TAP_ASYNC;
751 else
752 tp->tap_flags &= ~TAP_ASYNC;
753 break;
754
755 case FIONREAD:
756 /* Take a look at devq first */
757 IF_POLL(&tp->tap_devq, mb);
758 if (mb != NULL) {
759 *(int *)data = 0;
760 for(; mb != NULL; mb = mb->m_next)
761 *(int *)data += mb->m_len;
762 } else {
763 *(int *)data = ifsq_poll_pktlen(
764 ifq_get_subq_default(&ifp->if_snd));
765 }
766 break;
767
768 case FIOSETOWN:
769 error = fsetown(*(int *)data, &tp->tap_sigio);
770 break;
771
772 case FIOGETOWN:
773 *(int *)data = fgetown(&tp->tap_sigio);
774 break;
775
776 /* this is deprecated, FIOSETOWN should be used instead */
777 case TIOCSPGRP:
778 error = fsetown(-(*(int *)data), &tp->tap_sigio);
779 break;
780
781 /* this is deprecated, FIOGETOWN should be used instead */
782 case TIOCGPGRP:
783 *(int *)data = -fgetown(&tp->tap_sigio);
784 break;
785
786 /* VMware/VMnet port ioctl's */
787
788 case SIOCGIFFLAGS: /* get ifnet flags */
789 bcopy(&ifp->if_flags, data, sizeof(ifp->if_flags));
790 break;
791
792 case VMIO_SIOCSIFFLAGS: /* VMware/VMnet SIOCSIFFLAGS */
793 f = *(short *)data;
794 f &= 0x0fff;
795 f &= ~IFF_CANTCHANGE;
796 f |= IFF_UP;
797 ifp->if_flags = f | (ifp->if_flags & IFF_CANTCHANGE);
798 break;
799
800 case OSIOCGIFADDR: /* get MAC address of the remote side */
801 case SIOCGIFADDR:
802 bcopy(tp->ether_addr, data, sizeof(tp->ether_addr));
803 break;
804
805 case SIOCSIFADDR: /* set MAC address of the remote side */
806 bcopy(data, tp->ether_addr, sizeof(tp->ether_addr));
807 break;
808
809 default:
810 error = ENOTTY;
811 break;
812 }
813 ifnet_deserialize_all(ifp);
814 return (error);
815 }
816
817
818 /*
819 * tapread
820 *
821 * The ops read interface - reads a packet at a time, or at
822 * least as much of a packet as can be read.
823 *
824 * Called from the fileops interface with nothing held.
825 *
826 * MPSAFE
827 */
828 static int
829 tapread(struct dev_read_args *ap)
830 {
831 cdev_t dev = ap->a_head.a_dev;
832 struct uio *uio = ap->a_uio;
833 struct tap_softc *tp = dev->si_drv1;
834 struct ifnet *ifp = &tp->tap_if;
835 struct mbuf *m0 = NULL;
836 int error = 0, len;
837
838 TAPDEBUG(ifp, "reading, minor = %#x\n", minor(tp->tap_dev));
839
840 if ((tp->tap_flags & TAP_READY) != TAP_READY) {
841 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
842 minor(tp->tap_dev), tp->tap_flags);
843
844 return (EHOSTDOWN);
845 }
846
847 tp->tap_flags &= ~TAP_RWAIT;
848
849 /* sleep until we get a packet */
850 do {
851 ifnet_serialize_all(ifp);
852 IF_DEQUEUE(&tp->tap_devq, m0);
853 if (m0 == NULL) {
854 if (ap->a_ioflag & IO_NDELAY) {
855 ifnet_deserialize_all(ifp);
856 return (EWOULDBLOCK);
857 }
858 tp->tap_flags |= TAP_RWAIT;
859 tsleep_interlock(tp, PCATCH);
860 ifnet_deserialize_all(ifp);
861 error = tsleep(tp, PCATCH | PINTERLOCKED, "taprd", 0);
862 if (error)
863 return (error);
864 } else {
865 ifnet_deserialize_all(ifp);
866 }
867 } while (m0 == NULL);
868
869 BPF_MTAP(ifp, m0);
870
871 /* xfer packet to user space */
872 while ((m0 != NULL) && (uio->uio_resid > 0) && (error == 0)) {
873 len = (int)szmin(uio->uio_resid, m0->m_len);
874 if (len == 0)
875 break;
876
877 error = uiomove(mtod(m0, caddr_t), (size_t)len, uio);
878 m0 = m_free(m0);
879 }
880
881 if (m0 != NULL) {
882 TAPDEBUG(ifp, "dropping mbuf, minor = %#x\n",
883 minor(tp->tap_dev));
884 m_freem(m0);
885 }
886
887 return (error);
888 }
889
890 /*
891 * tapwrite
892 *
893 * The ops write interface - an atomic write is a packet - or else!
894 *
895 * Called from the fileops interface with nothing held.
896 *
897 * MPSAFE
898 */
899 static int
900 tapwrite(struct dev_write_args *ap)
901 {
902 cdev_t dev = ap->a_head.a_dev;
903 struct uio *uio = ap->a_uio;
904 struct tap_softc *tp = dev->si_drv1;
905 struct ifnet *ifp = &tp->tap_if;
906 struct mbuf *top = NULL, **mp = NULL, *m = NULL;
907 int error;
908 size_t tlen, mlen;
909
910 TAPDEBUG(ifp, "writing, minor = %#x\n", minor(tp->tap_dev));
911
912 if ((tp->tap_flags & TAP_READY) != TAP_READY) {
913 TAPDEBUG(ifp, "not ready. minor = %#x, tap_flags = 0x%x\n",
914 minor(tp->tap_dev), tp->tap_flags);
915 return (EHOSTDOWN);
916 }
917
918 if (uio->uio_resid == 0)
919 return (0);
920
921 if (uio->uio_resid > TAPMRU) {
922 TAPDEBUG(ifp, "invalid packet len = %zu, minor = %#x\n",
923 uio->uio_resid, minor(tp->tap_dev));
924
925 return (EIO);
926 }
927 tlen = uio->uio_resid;
928
929 /* get a header mbuf */
930 MGETHDR(m, M_WAITOK, MT_DATA);
931 if (m == NULL)
932 return (ENOBUFS);
933 mlen = MHLEN;
934
935 top = NULL;
936 mp = &top;
937 error = 0;
938
939 while (error == 0 && uio->uio_resid > 0) {
940 m->m_len = (int)szmin(mlen, uio->uio_resid);
941 error = uiomove(mtod(m, caddr_t), (size_t)m->m_len, uio);
942 *mp = m;
943 mp = &m->m_next;
944 if (uio->uio_resid > 0) {
945 MGET(m, M_WAITOK, MT_DATA);
946 if (m == NULL) {
947 error = ENOBUFS;
948 break;
949 }
950 mlen = MLEN;
951 }
952 }
953 if (error) {
954 IFNET_STAT_INC(ifp, ierrors, 1);
955 if (top)
956 m_freem(top);
957 return (error);
958 }
959
960 top->m_pkthdr.len = (int)tlen;
961 top->m_pkthdr.rcvif = ifp;
962
963 /*
964 * Ethernet bridge and bpf are handled in ether_input
965 *
966 * adjust mbuf and give packet to the ether_input
967 */
968 ifnet_serialize_all(ifp);
969 ifp->if_input(ifp, top, NULL, -1);
970 IFNET_STAT_INC(ifp, ipackets, 1);/* ibytes are counted in ether_input */
971 ifnet_deserialize_all(ifp);
972
973 return (0);
974 }
975
976 /*
977 * tapkqfilter - called from the fileops interface with nothing held
978 *
979 * MPSAFE
980 */
981 static int filt_tapread(struct knote *kn, long hint);
982 static int filt_tapwrite(struct knote *kn, long hint);
983 static void filt_tapdetach(struct knote *kn);
984 static struct filterops tapread_filtops =
985 { FILTEROP_ISFD, NULL, filt_tapdetach, filt_tapread };
986 static struct filterops tapwrite_filtops =
987 { FILTEROP_ISFD, NULL, filt_tapdetach, filt_tapwrite };
988
989 static int
990 tapkqfilter(struct dev_kqfilter_args *ap)
991 {
992 cdev_t dev = ap->a_head.a_dev;
993 struct knote *kn = ap->a_kn;
994 struct tap_softc *tp;
995 struct klist *list;
996
997 tp = dev->si_drv1;
998 list = &tp->tap_rkq.ki_note;
999 ap->a_result =0;
1000
1001 switch(kn->kn_filter) {
1002 case EVFILT_READ:
1003 kn->kn_fop = &tapread_filtops;
1004 kn->kn_hook = (void *)tp;
1005 break;
1006 case EVFILT_WRITE:
1007 kn->kn_fop = &tapwrite_filtops;
1008 kn->kn_hook = (void *)tp;
1009 break;
1010 default:
1011 ap->a_result = EOPNOTSUPP;
1012 return(0);
1013 }
1014
1015 knote_insert(list, kn);
1016 return(0);
1017 }
1018
1019 static int
1020 filt_tapread(struct knote *kn, long hint)
1021 {
1022 struct tap_softc *tp = (void *)kn->kn_hook;
1023
1024 if (IF_QEMPTY(&tp->tap_devq) == 0) /* XXX serializer */
1025 return(1);
1026 else
1027 return(0);
1028 }
1029
1030 static int
1031 filt_tapwrite(struct knote *kn, long hint)
1032 {
1033 /* Always ready for a write */
1034 return (1);
1035 }
1036
1037 static void
1038 filt_tapdetach(struct knote *kn)
1039 {
1040 struct tap_softc *tp = (void *)kn->kn_hook;
1041
1042 knote_remove(&tp->tap_rkq.ki_note, kn);
1043 }
1044
1045 static void
1046 tapifstop(struct tap_softc *tp, int clear_flags)
1047 {
1048 struct ifnet *ifp = &tp->tap_if;
1049
1050 ASSERT_IFNET_SERIALIZED_ALL(ifp);
1051 IF_DRAIN(&tp->tap_devq);
1052 tp->tap_flags &= ~TAP_CLOSEDOWN;
1053 if (clear_flags) {
1054 ifp->if_flags &= ~IFF_RUNNING;
1055 ifsq_clr_oactive(ifq_get_subq_default(&ifp->if_snd));
1056 }
1057 }
1058
1059 static void
1060 tapifflags(struct tap_softc *tp)
1061 {
1062 struct ifnet *ifp = &tp->arpcom.ac_if;
1063
1064 ASSERT_IFNET_SERIALIZED_ALL(ifp);
1065 if ((tp->tap_flags & TAP_VMNET) == 0) {
1066 /*
1067 * Only for non-vmnet tap(4)
1068 */
1069 if (ifp->if_flags & IFF_UP) {
1070 if ((ifp->if_flags & IFF_RUNNING) == 0)
1071 tapifinit(tp);
1072 } else {
1073 tapifstop(tp, 1);
1074 }
1075 } else {
1076 /* XXX */
1077 }
1078 }
DragonFly BSD