59static MALLOC_DEFINE(M_TUN, "tun", "Tunnel Interface");
60
61static void tunattach __P((void *));
62PSEUDO_SET(tunattach, if_tun);
63
64static void tuncreate __P((dev_t dev));
65
66#define TUNDEBUG if (tundebug) printf
67static int tundebug = 0;
68SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, "");
69
70static int tunoutput __P((struct ifnet *, struct mbuf *, struct sockaddr *,
71 struct rtentry *rt));
72static int tunifioctl __P((struct ifnet *, u_long, caddr_t));
73static int tuninit __P((struct ifnet *));
74
75static d_open_t tunopen;
76static d_close_t tunclose;
77static d_read_t tunread;
78static d_write_t tunwrite;
79static d_ioctl_t tunioctl;
80static d_poll_t tunpoll;
81
82#define CDEV_MAJOR 52
83static struct cdevsw tun_cdevsw = {
84 /* open */ tunopen,
85 /* close */ tunclose,
86 /* read */ tunread,
87 /* write */ tunwrite,
88 /* ioctl */ tunioctl,
89 /* poll */ tunpoll,
90 /* mmap */ nommap,
91 /* strategy */ nostrategy,
92 /* name */ "tun",
93 /* maj */ CDEV_MAJOR,
94 /* dump */ nodump,
95 /* psize */ nopsize,
96 /* flags */ 0,
97 /* bmaj */ -1
98};
99
|
134}
135
136static void
137tuncreate(dev)
138 dev_t dev;
139{
140 struct tun_softc *sc;
141 struct ifnet *ifp;
142
143 dev = make_dev(&tun_cdevsw, minor(dev),
144 UID_UUCP, GID_DIALER, 0600, "tun%d", lminor(dev));
145
146 MALLOC(sc, struct tun_softc *, sizeof(*sc), M_TUN, M_WAITOK);
147 bzero(sc, sizeof *sc);
148 sc->tun_flags = TUN_INITED;
149
150 ifp = &sc->tun_if;
151 ifp->if_unit = lminor(dev);
152 ifp->if_name = "tun";
153 ifp->if_mtu = TUNMTU;
154 ifp->if_ioctl = tunifioctl;
155 ifp->if_output = tunoutput;
156 ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
157 ifp->if_type = IFT_PPP;
158 ifp->if_snd.ifq_maxlen = ifqmaxlen;
159 ifp->if_softc = sc;
160 if_attach(ifp);
161 bpfattach(ifp, DLT_NULL, sizeof(u_int));
162 dev->si_drv1 = sc;
163}
164
165/*
166 * tunnel open - must be superuser & the device must be
167 * configured in
168 */
169static int
170tunopen(dev, flag, mode, p)
171 dev_t dev;
172 int flag, mode;
173 struct proc *p;
174{
175 struct ifnet *ifp;
176 struct tun_softc *tp;
177 register int error;
178
179 error = suser(p);
180 if (error)
181 return (error);
182
183 tp = dev->si_drv1;
184 if (!tp) {
185 tuncreate(dev);
186 tp = dev->si_drv1;
187 }
188 if (tp->tun_flags & TUN_OPEN)
189 return EBUSY;
190 tp->tun_pid = p->p_pid;
191 ifp = &tp->tun_if;
192 tp->tun_flags |= TUN_OPEN;
193 TUNDEBUG("%s%d: open\n", ifp->if_name, ifp->if_unit);
194 return (0);
195}
196
197/*
198 * tunclose - close the device - mark i/f down & delete
199 * routing info
200 */
201static int
202tunclose(dev, foo, bar, p)
203 dev_t dev;
204 int foo;
205 int bar;
206 struct proc *p;
207{
208 register int s;
209 struct tun_softc *tp;
210 struct ifnet *ifp;
211 struct mbuf *m;
212
213 tp = dev->si_drv1;
214 ifp = &tp->tun_if;
215
216 tp->tun_flags &= ~TUN_OPEN;
217 tp->tun_pid = 0;
218
219 /*
220 * junk all pending output
221 */
222 do {
223 s = splimp();
224 IF_DEQUEUE(&ifp->if_snd, m);
225 splx(s);
226 if (m)
227 m_freem(m);
228 } while (m);
229
230 if (ifp->if_flags & IFF_UP) {
231 s = splimp();
232 if_down(ifp);
233 splx(s);
234 }
235
236 if (ifp->if_flags & IFF_RUNNING) {
237 register struct ifaddr *ifa;
238
239 s = splimp();
240 /* find internet addresses and delete routes */
241 for (ifa = ifp->if_addrhead.tqh_first; ifa;
242 ifa = ifa->ifa_link.tqe_next)
243 if (ifa->ifa_addr->sa_family == AF_INET)
244 rtinit(ifa, (int)RTM_DELETE,
245 tp->tun_flags & TUN_DSTADDR ? RTF_HOST : 0);
246 ifp->if_flags &= ~IFF_RUNNING;
247 splx(s);
248 }
249
250 funsetown(tp->tun_sigio);
251 selwakeup(&tp->tun_rsel);
252
253 TUNDEBUG ("%s%d: closed\n", ifp->if_name, ifp->if_unit);
254 return (0);
255}
256
257static int
258tuninit(ifp)
259 struct ifnet *ifp;
260{
261 struct tun_softc *tp = ifp->if_softc;
262 register struct ifaddr *ifa;
263
264 TUNDEBUG("%s%d: tuninit\n", ifp->if_name, ifp->if_unit);
265
266 ifp->if_flags |= IFF_UP | IFF_RUNNING;
267 getmicrotime(&ifp->if_lastchange);
268
269 for (ifa = ifp->if_addrhead.tqh_first; ifa;
270 ifa = ifa->ifa_link.tqe_next) {
271#ifdef INET
272 if (ifa->ifa_addr->sa_family == AF_INET) {
273 struct sockaddr_in *si;
274
275 si = (struct sockaddr_in *)ifa->ifa_addr;
276 if (si && si->sin_addr.s_addr)
277 tp->tun_flags |= TUN_IASET;
278
279 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
280 if (si && si->sin_addr.s_addr)
281 tp->tun_flags |= TUN_DSTADDR;
282 }
283#endif
284 }
285 return 0;
286}
287
288/*
289 * Process an ioctl request.
290 */
291int
292tunifioctl(ifp, cmd, data)
293 struct ifnet *ifp;
294 u_long cmd;
295 caddr_t data;
296{
297 struct ifreq *ifr = (struct ifreq *)data;
298 struct tun_softc *tp = ifp->if_softc;
299 struct ifstat *ifs;
300 int error = 0, s;
301
302 s = splimp();
303 switch(cmd) {
304 case SIOCGIFSTATUS:
305 ifs = (struct ifstat *)data;
306 if (tp->tun_pid)
307 sprintf(ifs->ascii + strlen(ifs->ascii),
308 "\tOpened by PID %d\n", tp->tun_pid);
309 return(0);
310 case SIOCSIFADDR:
311 tuninit(ifp);
312 TUNDEBUG("%s%d: address set\n",
313 ifp->if_name, ifp->if_unit);
314 break;
315 case SIOCSIFDSTADDR:
316 tuninit(ifp);
317 TUNDEBUG("%s%d: destination address set\n",
318 ifp->if_name, ifp->if_unit);
319 break;
320 case SIOCSIFMTU:
321 ifp->if_mtu = ifr->ifr_mtu;
322 TUNDEBUG("%s%d: mtu set\n",
323 ifp->if_name, ifp->if_unit);
324 break;
325 case SIOCADDMULTI:
326 case SIOCDELMULTI:
327 break;
328
329
330 default:
331 error = EINVAL;
332 }
333 splx(s);
334 return (error);
335}
336
337/*
338 * tunoutput - queue packets from higher level ready to put out.
339 */
340int
341tunoutput(ifp, m0, dst, rt)
342 struct ifnet *ifp;
343 struct mbuf *m0;
344 struct sockaddr *dst;
345 struct rtentry *rt;
346{
347 struct tun_softc *tp = ifp->if_softc;
348 int s;
349
350 TUNDEBUG ("%s%d: tunoutput\n", ifp->if_name, ifp->if_unit);
351
352 if ((tp->tun_flags & TUN_READY) != TUN_READY) {
353 TUNDEBUG ("%s%d: not ready 0%o\n", ifp->if_name,
354 ifp->if_unit, tp->tun_flags);
355 m_freem (m0);
356 return EHOSTDOWN;
357 }
358
359 /* BPF write needs to be handled specially */
360 if (dst->sa_family == AF_UNSPEC) {
361 dst->sa_family = *(mtod(m0, int *));
362 m0->m_len -= sizeof(int);
363 m0->m_pkthdr.len -= sizeof(int);
364 m0->m_data += sizeof(int);
365 }
366
367 if (ifp->if_bpf) {
368 /*
369 * We need to prepend the address family as
370 * a four byte field. Cons up a dummy header
371 * to pacify bpf. This is safe because bpf
372 * will only read from the mbuf (i.e., it won't
373 * try to free it or keep a pointer to it).
374 */
375 struct mbuf m;
376 u_int af = dst->sa_family;
377
378 m.m_next = m0;
379 m.m_len = 4;
380 m.m_data = (char *)⁡
381
382 bpf_mtap(ifp, &m);
383 }
384
385 /* prepend sockaddr? this may abort if the mbuf allocation fails */
386 if (tp->tun_flags & TUN_LMODE) {
387 /* allocate space for sockaddr */
388 M_PREPEND(m0, dst->sa_len, M_DONTWAIT);
389
390 /* if allocation failed drop packet */
391 if (m0 == NULL){
392 s = splimp(); /* spl on queue manipulation */
393 IF_DROP(&ifp->if_snd);
394 splx(s);
395 ifp->if_oerrors++;
396 return (ENOBUFS);
397 } else {
398 bcopy(dst, m0->m_data, dst->sa_len);
399 }
400 }
401
402 if (tp->tun_flags & TUN_IFHEAD) {
403 /* Prepend the address family */
404 M_PREPEND(m0, 4, M_DONTWAIT);
405
406 /* if allocation failed drop packet */
407 if (m0 == NULL){
408 s = splimp(); /* spl on queue manipulation */
409 IF_DROP(&ifp->if_snd);
410 splx(s);
411 ifp->if_oerrors++;
412 return ENOBUFS;
413 } else
414 *(u_int32_t *)m0->m_data = htonl(dst->sa_family);
415 } else {
416#ifdef INET
417 if (dst->sa_family != AF_INET)
418#endif
419 {
420 m_freem(m0);
421 return EAFNOSUPPORT;
422 }
423 }
424
425 s = splimp();
426 if (IF_QFULL(&ifp->if_snd)) {
427 IF_DROP(&ifp->if_snd);
428 m_freem(m0);
429 splx(s);
430 ifp->if_collisions++;
431 return ENOBUFS;
432 }
433 ifp->if_obytes += m0->m_pkthdr.len;
434 IF_ENQUEUE(&ifp->if_snd, m0);
435 splx(s);
436 ifp->if_opackets++;
437
438 if (tp->tun_flags & TUN_RWAIT) {
439 tp->tun_flags &= ~TUN_RWAIT;
440 wakeup((caddr_t)tp);
441 }
442 if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio)
443 pgsigio(tp->tun_sigio, SIGIO, 0);
444 selwakeup(&tp->tun_rsel);
445 return 0;
446}
447
448/*
449 * the cdevsw interface is now pretty minimal.
450 */
451static int
452tunioctl(dev, cmd, data, flag, p)
453 dev_t dev;
454 u_long cmd;
455 caddr_t data;
456 int flag;
457 struct proc *p;
458{
459 int s;
460 struct tun_softc *tp = dev->si_drv1;
461 struct tuninfo *tunp;
462
463 switch (cmd) {
464 case TUNSIFINFO:
465 tunp = (struct tuninfo *)data;
466 if (tunp->mtu < IF_MINMTU)
467 return (EINVAL);
468 tp->tun_if.if_mtu = tunp->mtu;
469 tp->tun_if.if_type = tunp->type;
470 tp->tun_if.if_baudrate = tunp->baudrate;
471 break;
472 case TUNGIFINFO:
473 tunp = (struct tuninfo *)data;
474 tunp->mtu = tp->tun_if.if_mtu;
475 tunp->type = tp->tun_if.if_type;
476 tunp->baudrate = tp->tun_if.if_baudrate;
477 break;
478 case TUNSDEBUG:
479 tundebug = *(int *)data;
480 break;
481 case TUNGDEBUG:
482 *(int *)data = tundebug;
483 break;
484 case TUNSLMODE:
485 if (*(int *)data) {
486 tp->tun_flags |= TUN_LMODE;
487 tp->tun_flags &= ~TUN_IFHEAD;
488 } else
489 tp->tun_flags &= ~TUN_LMODE;
490 break;
491 case TUNSIFHEAD:
492 if (*(int *)data) {
493 tp->tun_flags |= TUN_IFHEAD;
494 tp->tun_flags &= ~TUN_LMODE;
495 } else
496 tp->tun_flags &= ~TUN_IFHEAD;
497 break;
498 case TUNGIFHEAD:
499 *(int *)data = (tp->tun_flags & TUN_IFHEAD) ? 1 : 0;
500 break;
501 case TUNSIFMODE:
502 /* deny this if UP */
503 if (tp->tun_if.if_flags & IFF_UP)
504 return(EBUSY);
505
506 switch (*(int *)data) {
507 case IFF_POINTOPOINT:
508 tp->tun_if.if_flags |= IFF_POINTOPOINT;
509 tp->tun_if.if_flags &= ~IFF_BROADCAST;
510 break;
511 case IFF_BROADCAST:
512 tp->tun_if.if_flags &= ~IFF_POINTOPOINT;
513 tp->tun_if.if_flags |= IFF_BROADCAST;
514 break;
515 default:
516 return(EINVAL);
517 }
518 break;
519 case TUNSIFPID:
520 tp->tun_pid = curproc->p_pid;
521 break;
522 case FIONBIO:
523 break;
524 case FIOASYNC:
525 if (*(int *)data)
526 tp->tun_flags |= TUN_ASYNC;
527 else
528 tp->tun_flags &= ~TUN_ASYNC;
529 break;
530 case FIONREAD:
531 s = splimp();
532 if (tp->tun_if.if_snd.ifq_head) {
533 struct mbuf *mb = tp->tun_if.if_snd.ifq_head;
534 for( *(int *)data = 0; mb != 0; mb = mb->m_next)
535 *(int *)data += mb->m_len;
536 } else
537 *(int *)data = 0;
538 splx(s);
539 break;
540 case FIOSETOWN:
541 return (fsetown(*(int *)data, &tp->tun_sigio));
542
543 case FIOGETOWN:
544 *(int *)data = fgetown(tp->tun_sigio);
545 return (0);
546
547 /* This is deprecated, FIOSETOWN should be used instead. */
548 case TIOCSPGRP:
549 return (fsetown(-(*(int *)data), &tp->tun_sigio));
550
551 /* This is deprecated, FIOGETOWN should be used instead. */
552 case TIOCGPGRP:
553 *(int *)data = -fgetown(tp->tun_sigio);
554 return (0);
555
556 default:
557 return (ENOTTY);
558 }
559 return (0);
560}
561
562/*
563 * The cdevsw read interface - reads a packet at a time, or at
564 * least as much of a packet as can be read.
565 */
566static int
567tunread(dev, uio, flag)
568 dev_t dev;
569 struct uio *uio;
570 int flag;
571{
572 struct tun_softc *tp = dev->si_drv1;
573 struct ifnet *ifp = &tp->tun_if;
574 struct mbuf *m, *m0;
575 int error=0, len, s;
576
577 TUNDEBUG ("%s%d: read\n", ifp->if_name, ifp->if_unit);
578 if ((tp->tun_flags & TUN_READY) != TUN_READY) {
579 TUNDEBUG ("%s%d: not ready 0%o\n", ifp->if_name,
580 ifp->if_unit, tp->tun_flags);
581 return EHOSTDOWN;
582 }
583
584 tp->tun_flags &= ~TUN_RWAIT;
585
586 s = splimp();
587 do {
588 IF_DEQUEUE(&ifp->if_snd, m0);
589 if (m0 == 0) {
590 if (flag & IO_NDELAY) {
591 splx(s);
592 return EWOULDBLOCK;
593 }
594 tp->tun_flags |= TUN_RWAIT;
595 if((error = tsleep((caddr_t)tp, PCATCH | (PZERO + 1),
596 "tunread", 0)) != 0) {
597 splx(s);
598 return error;
599 }
600 }
601 } while (m0 == 0);
602 splx(s);
603
604 while (m0 && uio->uio_resid > 0 && error == 0) {
605 len = min(uio->uio_resid, m0->m_len);
606 if (len == 0)
607 break;
608 error = uiomove(mtod(m0, caddr_t), len, uio);
609 MFREE(m0, m);
610 m0 = m;
611 }
612
613 if (m0) {
614 TUNDEBUG("Dropping mbuf\n");
615 m_freem(m0);
616 }
617 return error;
618}
619
620/*
621 * the cdevsw write interface - an atomic write is a packet - or else!
622 */
623static int
624tunwrite(dev, uio, flag)
625 dev_t dev;
626 struct uio *uio;
627 int flag;
628{
629 struct tun_softc *tp = dev->si_drv1;
630 struct ifnet *ifp = &tp->tun_if;
631 struct mbuf *top, **mp, *m;
632 int error=0, tlen, mlen;
633 u_int32_t family;
634
635 TUNDEBUG("%s%d: tunwrite\n", ifp->if_name, ifp->if_unit);
636
637 if (uio->uio_resid == 0)
638 return 0;
639
640 if (uio->uio_resid < 0 || uio->uio_resid > TUNMRU) {
641 TUNDEBUG("%s%d: len=%d!\n", ifp->if_name, ifp->if_unit,
642 uio->uio_resid);
643 return EIO;
644 }
645 tlen = uio->uio_resid;
646
647 /* get a header mbuf */
648 MGETHDR(m, M_DONTWAIT, MT_DATA);
649 if (m == NULL)
650 return ENOBUFS;
651 mlen = MHLEN;
652
653 top = 0;
654 mp = ⊤
655 while (error == 0 && uio->uio_resid > 0) {
656 m->m_len = min(mlen, uio->uio_resid);
657 error = uiomove(mtod (m, caddr_t), m->m_len, uio);
658 *mp = m;
659 mp = &m->m_next;
660 if (uio->uio_resid > 0) {
661 MGET (m, M_DONTWAIT, MT_DATA);
662 if (m == 0) {
663 error = ENOBUFS;
664 break;
665 }
666 mlen = MLEN;
667 }
668 }
669 if (error) {
670 if (top)
671 m_freem (top);
672 ifp->if_ierrors++;
673 return error;
674 }
675
676 top->m_pkthdr.len = tlen;
677 top->m_pkthdr.rcvif = ifp;
678
679 if (ifp->if_bpf) {
680 if (tp->tun_flags & TUN_IFHEAD)
681 /*
682 * Conveniently, we already have a 4-byte address
683 * family prepended to our packet !
684 */
685 bpf_mtap(ifp, top);
686 else {
687 /*
688 * We need to prepend the address family as
689 * a four byte field. Cons up a dummy header
690 * to pacify bpf. This is safe because bpf
691 * will only read from the mbuf (i.e., it won't
692 * try to free it or keep a pointer to it).
693 */
694 struct mbuf m;
695 u_int af = AF_INET;
696
697 m.m_next = top;
698 m.m_len = 4;
699 m.m_data = (char *)⁡
700
701 bpf_mtap(ifp, &m);
702 }
703 }
704
705 if (tp->tun_flags & TUN_IFHEAD) {
706 if (top->m_len < sizeof(family) &&
707 (top = m_pullup(top, sizeof(family))) == NULL)
708 return ENOBUFS;
709 family = ntohl(*mtod(top, u_int32_t *));
710 m_adj(top, sizeof(family));
711 } else
712 family = AF_INET;
713
714 ifp->if_ibytes += top->m_pkthdr.len;
715 ifp->if_ipackets++;
716
717 return family_enqueue(family, top);
718}
719
720/*
721 * tunpoll - the poll interface, this is only useful on reads
722 * really. The write detect always returns true, write never blocks
723 * anyway, it either accepts the packet or drops it.
724 */
725static int
726tunpoll(dev, events, p)
727 dev_t dev;
728 int events;
729 struct proc *p;
730{
731 int s;
732 struct tun_softc *tp = dev->si_drv1;
733 struct ifnet *ifp = &tp->tun_if;
734 int revents = 0;
735
736 s = splimp();
737 TUNDEBUG("%s%d: tunpoll\n", ifp->if_name, ifp->if_unit);
738
739 if (events & (POLLIN | POLLRDNORM)) {
740 if (ifp->if_snd.ifq_len > 0) {
741 TUNDEBUG("%s%d: tunpoll q=%d\n", ifp->if_name,
742 ifp->if_unit, ifp->if_snd.ifq_len);
743 revents |= events & (POLLIN | POLLRDNORM);
744 } else {
745 TUNDEBUG("%s%d: tunpoll waiting\n", ifp->if_name,
746 ifp->if_unit);
747 selrecord(p, &tp->tun_rsel);
748 }
749 }
750 if (events & (POLLOUT | POLLWRNORM))
751 revents |= events & (POLLOUT | POLLWRNORM);
752
753 splx(s);
754 return (revents);
755}
|