1 | /* $NetBSD: if_tun.c,v 1.133 2016/10/02 14:17:07 christos Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk> |
5 | * Nottingham University 1987. |
6 | * |
7 | * This source may be freely distributed, however I would be interested |
8 | * in any changes that are made. |
9 | * |
10 | * This driver takes packets off the IP i/f and hands them up to a |
11 | * user process to have its wicked way with. This driver has its |
12 | * roots in a similar driver written by Phil Cockcroft (formerly) at |
13 | * UCL. This driver is based much more on read/write/poll mode of |
14 | * operation though. |
15 | */ |
16 | |
17 | #include <sys/cdefs.h> |
18 | __KERNEL_RCSID(0, "$NetBSD: if_tun.c,v 1.133 2016/10/02 14:17:07 christos Exp $" ); |
19 | |
20 | #ifdef _KERNEL_OPT |
21 | #include "opt_inet.h" |
22 | #endif |
23 | |
24 | #include <sys/param.h> |
25 | #include <sys/proc.h> |
26 | #include <sys/systm.h> |
27 | #include <sys/mbuf.h> |
28 | #include <sys/buf.h> |
29 | #include <sys/protosw.h> |
30 | #include <sys/socket.h> |
31 | #include <sys/ioctl.h> |
32 | #include <sys/errno.h> |
33 | #include <sys/syslog.h> |
34 | #include <sys/select.h> |
35 | #include <sys/poll.h> |
36 | #include <sys/file.h> |
37 | #include <sys/signalvar.h> |
38 | #include <sys/conf.h> |
39 | #include <sys/kauth.h> |
40 | #include <sys/mutex.h> |
41 | #include <sys/cpu.h> |
42 | #include <sys/device.h> |
43 | #include <sys/module.h> |
44 | |
45 | #include <net/if.h> |
46 | #include <net/if_types.h> |
47 | #include <net/netisr.h> |
48 | #include <net/route.h> |
49 | |
50 | |
51 | #ifdef INET |
52 | #include <netinet/in.h> |
53 | #include <netinet/in_systm.h> |
54 | #include <netinet/in_var.h> |
55 | #include <netinet/ip.h> |
56 | #include <netinet/if_inarp.h> |
57 | #endif |
58 | |
59 | |
60 | #include <sys/time.h> |
61 | #include <net/bpf.h> |
62 | |
63 | #include <net/if_tun.h> |
64 | |
65 | #include "ioconf.h" |
66 | |
67 | #define TUNDEBUG if (tundebug) printf |
68 | int tundebug = 0; |
69 | |
70 | extern int ifqmaxlen; |
71 | |
72 | static LIST_HEAD(, tun_softc) tun_softc_list; |
73 | static LIST_HEAD(, tun_softc) tunz_softc_list; |
74 | static kmutex_t tun_softc_lock; |
75 | |
76 | static int tun_ioctl(struct ifnet *, u_long, void *); |
77 | static int tun_output(struct ifnet *, struct mbuf *, |
78 | const struct sockaddr *, const struct rtentry *rt); |
79 | static int tun_clone_create(struct if_clone *, int); |
80 | static int tun_clone_destroy(struct ifnet *); |
81 | |
82 | static struct if_clone tun_cloner = |
83 | IF_CLONE_INITIALIZER("tun" , tun_clone_create, tun_clone_destroy); |
84 | |
85 | static void tunattach0(struct tun_softc *); |
86 | static void tun_enable(struct tun_softc *, const struct ifaddr *); |
87 | static void tun_i_softintr(void *); |
88 | static void tun_o_softintr(void *); |
89 | #ifdef ALTQ |
90 | static void tunstart(struct ifnet *); |
91 | #endif |
92 | static struct tun_softc *tun_find_unit(dev_t); |
93 | static struct tun_softc *tun_find_zunit(int); |
94 | |
95 | static dev_type_open(tunopen); |
96 | static dev_type_close(tunclose); |
97 | static dev_type_read(tunread); |
98 | static dev_type_write(tunwrite); |
99 | static dev_type_ioctl(tunioctl); |
100 | static dev_type_poll(tunpoll); |
101 | static dev_type_kqfilter(tunkqfilter); |
102 | |
103 | const struct cdevsw tun_cdevsw = { |
104 | .d_open = tunopen, |
105 | .d_close = tunclose, |
106 | .d_read = tunread, |
107 | .d_write = tunwrite, |
108 | .d_ioctl = tunioctl, |
109 | .d_stop = nostop, |
110 | .d_tty = notty, |
111 | .d_poll = tunpoll, |
112 | .d_mmap = nommap, |
113 | .d_kqfilter = tunkqfilter, |
114 | .d_discard = nodiscard, |
115 | .d_flag = D_OTHER |
116 | }; |
117 | |
118 | #ifdef _MODULE |
119 | devmajor_t tun_bmajor = -1, tun_cmajor = -1; |
120 | #endif |
121 | |
122 | void |
123 | tunattach(int unused) |
124 | { |
125 | |
126 | /* |
127 | * Nothing to do here, initialization is handled by the |
128 | * module initialization code in tuninit() below). |
129 | */ |
130 | } |
131 | |
132 | static void |
133 | tuninit(void) |
134 | { |
135 | |
136 | mutex_init(&tun_softc_lock, MUTEX_DEFAULT, IPL_NET); |
137 | LIST_INIT(&tun_softc_list); |
138 | LIST_INIT(&tunz_softc_list); |
139 | if_clone_attach(&tun_cloner); |
140 | #ifdef _MODULE |
141 | devsw_attach("tun" , NULL, &tun_bmajor, &tun_cdevsw, &tun_cmajor); |
142 | #endif |
143 | } |
144 | |
145 | static int |
146 | tundetach(void) |
147 | { |
148 | int error = 0; |
149 | |
150 | if (!LIST_EMPTY(&tun_softc_list) || !LIST_EMPTY(&tunz_softc_list)) |
151 | error = EBUSY; |
152 | |
153 | #ifdef _MODULE |
154 | if (error == 0) |
155 | error = devsw_detach(NULL, &tun_cdevsw); |
156 | #endif |
157 | if (error == 0) { |
158 | if_clone_detach(&tun_cloner); |
159 | mutex_destroy(&tun_softc_lock); |
160 | } |
161 | |
162 | return error; |
163 | } |
164 | |
165 | /* |
166 | * Find driver instance from dev_t. |
167 | * Returns with tp locked (if found). |
168 | */ |
169 | static struct tun_softc * |
170 | tun_find_unit(dev_t dev) |
171 | { |
172 | struct tun_softc *tp; |
173 | int unit = minor(dev); |
174 | |
175 | mutex_enter(&tun_softc_lock); |
176 | LIST_FOREACH(tp, &tun_softc_list, tun_list) |
177 | if (unit == tp->tun_unit) |
178 | break; |
179 | if (tp) |
180 | mutex_enter(&tp->tun_lock); |
181 | mutex_exit(&tun_softc_lock); |
182 | |
183 | return (tp); |
184 | } |
185 | |
186 | /* |
187 | * Find zombie driver instance by unit number. |
188 | * Remove tp from list and return it unlocked (if found). |
189 | */ |
190 | static struct tun_softc * |
191 | tun_find_zunit(int unit) |
192 | { |
193 | struct tun_softc *tp; |
194 | |
195 | mutex_enter(&tun_softc_lock); |
196 | LIST_FOREACH(tp, &tunz_softc_list, tun_list) |
197 | if (unit == tp->tun_unit) |
198 | break; |
199 | if (tp) |
200 | LIST_REMOVE(tp, tun_list); |
201 | mutex_exit(&tun_softc_lock); |
202 | #ifdef DIAGNOSTIC |
203 | if (tp != NULL && (tp->tun_flags & (TUN_INITED|TUN_OPEN)) != TUN_OPEN) |
204 | printf("tun%d: inconsistent flags: %x\n" , unit, tp->tun_flags); |
205 | #endif |
206 | |
207 | return (tp); |
208 | } |
209 | |
210 | static int |
211 | tun_clone_create(struct if_clone *ifc, int unit) |
212 | { |
213 | struct tun_softc *tp; |
214 | |
215 | if ((tp = tun_find_zunit(unit)) == NULL) { |
216 | /* Allocate a new instance */ |
217 | tp = malloc(sizeof(*tp), M_DEVBUF, M_WAITOK|M_ZERO); |
218 | |
219 | tp->tun_unit = unit; |
220 | mutex_init(&tp->tun_lock, MUTEX_DEFAULT, IPL_NET); |
221 | selinit(&tp->tun_rsel); |
222 | selinit(&tp->tun_wsel); |
223 | } else { |
224 | /* Revive tunnel instance; clear ifp part */ |
225 | (void)memset(&tp->tun_if, 0, sizeof(struct ifnet)); |
226 | } |
227 | |
228 | if_initname(&tp->tun_if, ifc->ifc_name, unit); |
229 | tunattach0(tp); |
230 | tp->tun_flags |= TUN_INITED; |
231 | tp->tun_osih = softint_establish(SOFTINT_CLOCK, tun_o_softintr, tp); |
232 | tp->tun_isih = softint_establish(SOFTINT_CLOCK, tun_i_softintr, tp); |
233 | |
234 | mutex_enter(&tun_softc_lock); |
235 | LIST_INSERT_HEAD(&tun_softc_list, tp, tun_list); |
236 | mutex_exit(&tun_softc_lock); |
237 | |
238 | return (0); |
239 | } |
240 | |
241 | static void |
242 | tunattach0(struct tun_softc *tp) |
243 | { |
244 | struct ifnet *ifp; |
245 | |
246 | ifp = &tp->tun_if; |
247 | ifp->if_softc = tp; |
248 | ifp->if_mtu = TUNMTU; |
249 | ifp->if_ioctl = tun_ioctl; |
250 | ifp->if_output = tun_output; |
251 | #ifdef ALTQ |
252 | ifp->if_start = tunstart; |
253 | #endif |
254 | ifp->if_flags = IFF_POINTOPOINT; |
255 | ifp->if_type = IFT_TUNNEL; |
256 | ifp->if_snd.ifq_maxlen = ifqmaxlen; |
257 | ifp->if_collisions = 0; |
258 | ifp->if_ierrors = 0; |
259 | ifp->if_oerrors = 0; |
260 | ifp->if_ipackets = 0; |
261 | ifp->if_opackets = 0; |
262 | ifp->if_ibytes = 0; |
263 | ifp->if_obytes = 0; |
264 | ifp->if_dlt = DLT_NULL; |
265 | IFQ_SET_READY(&ifp->if_snd); |
266 | if_attach(ifp); |
267 | if_alloc_sadl(ifp); |
268 | bpf_attach(ifp, DLT_NULL, sizeof(uint32_t)); |
269 | } |
270 | |
271 | static int |
272 | tun_clone_destroy(struct ifnet *ifp) |
273 | { |
274 | struct tun_softc *tp = (void *)ifp; |
275 | int zombie = 0; |
276 | |
277 | IF_PURGE(&ifp->if_snd); |
278 | ifp->if_flags &= ~IFF_RUNNING; |
279 | |
280 | mutex_enter(&tun_softc_lock); |
281 | mutex_enter(&tp->tun_lock); |
282 | LIST_REMOVE(tp, tun_list); |
283 | if (tp->tun_flags & TUN_OPEN) { |
284 | /* Hang on to storage until last close */ |
285 | zombie = 1; |
286 | tp->tun_flags &= ~TUN_INITED; |
287 | LIST_INSERT_HEAD(&tunz_softc_list, tp, tun_list); |
288 | } |
289 | mutex_exit(&tun_softc_lock); |
290 | |
291 | if (tp->tun_flags & TUN_RWAIT) { |
292 | tp->tun_flags &= ~TUN_RWAIT; |
293 | wakeup((void *)tp); |
294 | } |
295 | selnotify(&tp->tun_rsel, 0, 0); |
296 | |
297 | mutex_exit(&tp->tun_lock); |
298 | |
299 | if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid) |
300 | fownsignal(tp->tun_pgid, SIGIO, POLL_HUP, 0, NULL); |
301 | |
302 | bpf_detach(ifp); |
303 | if_detach(ifp); |
304 | |
305 | if (!zombie) { |
306 | seldestroy(&tp->tun_rsel); |
307 | seldestroy(&tp->tun_wsel); |
308 | softint_disestablish(tp->tun_osih); |
309 | softint_disestablish(tp->tun_isih); |
310 | mutex_destroy(&tp->tun_lock); |
311 | free(tp, M_DEVBUF); |
312 | } |
313 | |
314 | return (0); |
315 | } |
316 | |
317 | /* |
318 | * tunnel open - must be superuser & the device must be |
319 | * configured in |
320 | */ |
321 | static int |
322 | tunopen(dev_t dev, int flag, int mode, struct lwp *l) |
323 | { |
324 | struct ifnet *ifp; |
325 | struct tun_softc *tp; |
326 | int error; |
327 | |
328 | error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE_TUN, |
329 | KAUTH_REQ_NETWORK_INTERFACE_TUN_ADD, NULL, NULL, NULL); |
330 | if (error) |
331 | return (error); |
332 | |
333 | tp = tun_find_unit(dev); |
334 | |
335 | if (tp == NULL) { |
336 | (void)tun_clone_create(&tun_cloner, minor(dev)); |
337 | tp = tun_find_unit(dev); |
338 | if (tp == NULL) { |
339 | error = ENXIO; |
340 | goto out_nolock; |
341 | } |
342 | } |
343 | |
344 | if (tp->tun_flags & TUN_OPEN) { |
345 | error = EBUSY; |
346 | goto out; |
347 | } |
348 | |
349 | ifp = &tp->tun_if; |
350 | tp->tun_flags |= TUN_OPEN; |
351 | TUNDEBUG("%s: open\n" , ifp->if_xname); |
352 | out: |
353 | mutex_exit(&tp->tun_lock); |
354 | out_nolock: |
355 | return (error); |
356 | } |
357 | |
358 | /* |
359 | * tunclose - close the device - mark i/f down & delete |
360 | * routing info |
361 | */ |
362 | int |
363 | tunclose(dev_t dev, int flag, int mode, |
364 | struct lwp *l) |
365 | { |
366 | struct tun_softc *tp; |
367 | struct ifnet *ifp; |
368 | |
369 | if ((tp = tun_find_zunit(minor(dev))) != NULL) { |
370 | /* interface was "destroyed" before the close */ |
371 | seldestroy(&tp->tun_rsel); |
372 | seldestroy(&tp->tun_wsel); |
373 | softint_disestablish(tp->tun_osih); |
374 | softint_disestablish(tp->tun_isih); |
375 | mutex_destroy(&tp->tun_lock); |
376 | free(tp, M_DEVBUF); |
377 | goto out_nolock; |
378 | } |
379 | |
380 | if ((tp = tun_find_unit(dev)) == NULL) |
381 | goto out_nolock; |
382 | |
383 | ifp = &tp->tun_if; |
384 | |
385 | tp->tun_flags &= ~TUN_OPEN; |
386 | |
387 | tp->tun_pgid = 0; |
388 | selnotify(&tp->tun_rsel, 0, 0); |
389 | |
390 | TUNDEBUG ("%s: closed\n" , ifp->if_xname); |
391 | mutex_exit(&tp->tun_lock); |
392 | |
393 | /* |
394 | * junk all pending output |
395 | */ |
396 | IFQ_PURGE(&ifp->if_snd); |
397 | |
398 | if (ifp->if_flags & IFF_UP) { |
399 | if_down(ifp); |
400 | if (ifp->if_flags & IFF_RUNNING) { |
401 | /* find internet addresses and delete routes */ |
402 | struct ifaddr *ifa; |
403 | IFADDR_READER_FOREACH(ifa, ifp) { |
404 | #if defined(INET) || defined(INET6) |
405 | if (ifa->ifa_addr->sa_family == AF_INET || |
406 | ifa->ifa_addr->sa_family == AF_INET6) { |
407 | rtinit(ifa, (int)RTM_DELETE, |
408 | tp->tun_flags & TUN_DSTADDR |
409 | ? RTF_HOST |
410 | : 0); |
411 | } |
412 | #endif |
413 | } |
414 | } |
415 | } |
416 | out_nolock: |
417 | return (0); |
418 | } |
419 | |
420 | /* |
421 | * Call at splnet(). |
422 | */ |
423 | static void |
424 | tun_enable(struct tun_softc *tp, const struct ifaddr *ifa) |
425 | { |
426 | struct ifnet *ifp = &tp->tun_if; |
427 | |
428 | TUNDEBUG("%s: %s\n" , __func__, ifp->if_xname); |
429 | |
430 | mutex_enter(&tp->tun_lock); |
431 | ifp->if_flags |= IFF_UP | IFF_RUNNING; |
432 | |
433 | tp->tun_flags &= ~(TUN_IASET|TUN_DSTADDR); |
434 | |
435 | switch (ifa->ifa_addr->sa_family) { |
436 | #ifdef INET |
437 | case AF_INET: { |
438 | struct sockaddr_in *sin; |
439 | |
440 | sin = satosin(ifa->ifa_addr); |
441 | if (sin && sin->sin_addr.s_addr) |
442 | tp->tun_flags |= TUN_IASET; |
443 | |
444 | if (ifp->if_flags & IFF_POINTOPOINT) { |
445 | sin = satosin(ifa->ifa_dstaddr); |
446 | if (sin && sin->sin_addr.s_addr) |
447 | tp->tun_flags |= TUN_DSTADDR; |
448 | } |
449 | break; |
450 | } |
451 | #endif |
452 | #ifdef INET6 |
453 | case AF_INET6: { |
454 | struct sockaddr_in6 *sin; |
455 | |
456 | sin = satosin6(ifa->ifa_addr); |
457 | if (!IN6_IS_ADDR_UNSPECIFIED(&sin->sin6_addr)) |
458 | tp->tun_flags |= TUN_IASET; |
459 | |
460 | if (ifp->if_flags & IFF_POINTOPOINT) { |
461 | sin = satosin6(ifa->ifa_dstaddr); |
462 | if (sin && !IN6_IS_ADDR_UNSPECIFIED(&sin->sin6_addr)) |
463 | tp->tun_flags |= TUN_DSTADDR; |
464 | } else |
465 | tp->tun_flags &= ~TUN_DSTADDR; |
466 | break; |
467 | } |
468 | #endif /* INET6 */ |
469 | default: |
470 | break; |
471 | } |
472 | mutex_exit(&tp->tun_lock); |
473 | } |
474 | |
475 | /* |
476 | * Process an ioctl request. |
477 | */ |
478 | static int |
479 | tun_ioctl(struct ifnet *ifp, u_long cmd, void *data) |
480 | { |
481 | int error = 0, s; |
482 | struct tun_softc *tp = (struct tun_softc *)(ifp->if_softc); |
483 | struct ifreq *ifr = (struct ifreq *)data; |
484 | struct ifaddr *ifa = (struct ifaddr *)data; |
485 | |
486 | s = splnet(); |
487 | |
488 | switch (cmd) { |
489 | case SIOCINITIFADDR: |
490 | tun_enable(tp, ifa); |
491 | ifa->ifa_rtrequest = p2p_rtrequest; |
492 | TUNDEBUG("%s: address set\n" , ifp->if_xname); |
493 | break; |
494 | case SIOCSIFBRDADDR: |
495 | TUNDEBUG("%s: broadcast address set\n" , ifp->if_xname); |
496 | break; |
497 | case SIOCSIFMTU: |
498 | if (ifr->ifr_mtu > TUNMTU || ifr->ifr_mtu < 576) { |
499 | error = EINVAL; |
500 | break; |
501 | } |
502 | TUNDEBUG("%s: interface mtu set\n" , ifp->if_xname); |
503 | if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) |
504 | error = 0; |
505 | break; |
506 | case SIOCADDMULTI: |
507 | case SIOCDELMULTI: |
508 | if (ifr == NULL) { |
509 | error = EAFNOSUPPORT; /* XXX */ |
510 | break; |
511 | } |
512 | switch (ifreq_getaddr(cmd, ifr)->sa_family) { |
513 | #ifdef INET |
514 | case AF_INET: |
515 | break; |
516 | #endif |
517 | #ifdef INET6 |
518 | case AF_INET6: |
519 | break; |
520 | #endif |
521 | default: |
522 | error = EAFNOSUPPORT; |
523 | break; |
524 | } |
525 | break; |
526 | default: |
527 | error = ifioctl_common(ifp, cmd, data); |
528 | } |
529 | |
530 | splx(s); |
531 | return (error); |
532 | } |
533 | |
534 | /* |
535 | * tun_output - queue packets from higher level ready to put out. |
536 | */ |
537 | static int |
538 | tun_output(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, |
539 | const struct rtentry *rt) |
540 | { |
541 | struct tun_softc *tp = ifp->if_softc; |
542 | int s; |
543 | int error; |
544 | #if defined(INET) || defined(INET6) |
545 | int mlen; |
546 | uint32_t *af; |
547 | #endif |
548 | |
549 | s = splnet(); |
550 | mutex_enter(&tp->tun_lock); |
551 | TUNDEBUG ("%s: tun_output\n" , ifp->if_xname); |
552 | |
553 | if ((tp->tun_flags & TUN_READY) != TUN_READY) { |
554 | TUNDEBUG ("%s: not ready 0%o\n" , ifp->if_xname, |
555 | tp->tun_flags); |
556 | error = EHOSTDOWN; |
557 | goto out; |
558 | } |
559 | |
560 | /* |
561 | * if the queueing discipline needs packet classification, |
562 | * do it before prepending link headers. |
563 | */ |
564 | IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family); |
565 | |
566 | bpf_mtap_af(ifp, dst->sa_family, m0); |
567 | |
568 | switch(dst->sa_family) { |
569 | #ifdef INET6 |
570 | case AF_INET6: |
571 | #endif |
572 | #ifdef INET |
573 | case AF_INET: |
574 | #endif |
575 | #if defined(INET) || defined(INET6) |
576 | if (tp->tun_flags & TUN_PREPADDR) { |
577 | /* Simple link-layer header */ |
578 | M_PREPEND(m0, dst->sa_len, M_DONTWAIT); |
579 | if (m0 == NULL) { |
580 | IF_DROP(&ifp->if_snd); |
581 | error = ENOBUFS; |
582 | goto out; |
583 | } |
584 | bcopy(dst, mtod(m0, char *), dst->sa_len); |
585 | } |
586 | |
587 | if (tp->tun_flags & TUN_IFHEAD) { |
588 | /* Prepend the address family */ |
589 | M_PREPEND(m0, sizeof(*af), M_DONTWAIT); |
590 | if (m0 == NULL) { |
591 | IF_DROP(&ifp->if_snd); |
592 | error = ENOBUFS; |
593 | goto out; |
594 | } |
595 | af = mtod(m0,uint32_t *); |
596 | *af = htonl(dst->sa_family); |
597 | } else { |
598 | #ifdef INET |
599 | if (dst->sa_family != AF_INET) |
600 | #endif |
601 | { |
602 | error = EAFNOSUPPORT; |
603 | goto out; |
604 | } |
605 | } |
606 | /* FALLTHROUGH */ |
607 | case AF_UNSPEC: |
608 | IFQ_ENQUEUE(&ifp->if_snd, m0, error); |
609 | if (error) { |
610 | ifp->if_collisions++; |
611 | error = EAFNOSUPPORT; |
612 | m0 = NULL; |
613 | goto out; |
614 | } |
615 | mlen = m0->m_pkthdr.len; |
616 | ifp->if_opackets++; |
617 | ifp->if_obytes += mlen; |
618 | break; |
619 | #endif |
620 | default: |
621 | error = EAFNOSUPPORT; |
622 | goto out; |
623 | } |
624 | |
625 | if (tp->tun_flags & TUN_RWAIT) { |
626 | tp->tun_flags &= ~TUN_RWAIT; |
627 | wakeup((void *)tp); |
628 | } |
629 | if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid) |
630 | softint_schedule(tp->tun_isih); |
631 | |
632 | selnotify(&tp->tun_rsel, 0, 0); |
633 | out: |
634 | mutex_exit(&tp->tun_lock); |
635 | splx(s); |
636 | |
637 | if (error && m0) { |
638 | m_freem(m0); |
639 | } |
640 | return 0; |
641 | } |
642 | |
643 | static void |
644 | tun_i_softintr(void *cookie) |
645 | { |
646 | struct tun_softc *tp = cookie; |
647 | |
648 | if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid) |
649 | fownsignal(tp->tun_pgid, SIGIO, POLL_IN, POLLIN|POLLRDNORM, |
650 | NULL); |
651 | } |
652 | |
653 | static void |
654 | tun_o_softintr(void *cookie) |
655 | { |
656 | struct tun_softc *tp = cookie; |
657 | |
658 | if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid) |
659 | fownsignal(tp->tun_pgid, SIGIO, POLL_OUT, POLLOUT|POLLWRNORM, |
660 | NULL); |
661 | } |
662 | |
663 | /* |
664 | * the cdevsw interface is now pretty minimal. |
665 | */ |
666 | int |
667 | tunioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) |
668 | { |
669 | struct tun_softc *tp; |
670 | int s, error = 0; |
671 | |
672 | s = splnet(); |
673 | tp = tun_find_unit(dev); |
674 | |
675 | /* interface was "destroyed" already */ |
676 | if (tp == NULL) { |
677 | error = ENXIO; |
678 | goto out_nolock; |
679 | } |
680 | |
681 | switch (cmd) { |
682 | case TUNSDEBUG: |
683 | tundebug = *(int *)data; |
684 | break; |
685 | |
686 | case TUNGDEBUG: |
687 | *(int *)data = tundebug; |
688 | break; |
689 | |
690 | case TUNSIFMODE: |
691 | switch (*(int *)data & (IFF_POINTOPOINT|IFF_BROADCAST)) { |
692 | case IFF_POINTOPOINT: |
693 | case IFF_BROADCAST: |
694 | if (tp->tun_if.if_flags & IFF_UP) { |
695 | error = EBUSY; |
696 | goto out; |
697 | } |
698 | tp->tun_if.if_flags &= |
699 | ~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST); |
700 | tp->tun_if.if_flags |= *(int *)data; |
701 | break; |
702 | default: |
703 | error = EINVAL; |
704 | goto out; |
705 | } |
706 | break; |
707 | |
708 | case TUNSLMODE: |
709 | if (*(int *)data) { |
710 | tp->tun_flags |= TUN_PREPADDR; |
711 | tp->tun_flags &= ~TUN_IFHEAD; |
712 | } else |
713 | tp->tun_flags &= ~TUN_PREPADDR; |
714 | break; |
715 | |
716 | case TUNSIFHEAD: |
717 | if (*(int *)data) { |
718 | tp->tun_flags |= TUN_IFHEAD; |
719 | tp->tun_flags &= ~TUN_PREPADDR; |
720 | } else |
721 | tp->tun_flags &= ~TUN_IFHEAD; |
722 | break; |
723 | |
724 | case TUNGIFHEAD: |
725 | *(int *)data = (tp->tun_flags & TUN_IFHEAD); |
726 | break; |
727 | |
728 | case FIONBIO: |
729 | if (*(int *)data) |
730 | tp->tun_flags |= TUN_NBIO; |
731 | else |
732 | tp->tun_flags &= ~TUN_NBIO; |
733 | break; |
734 | |
735 | case FIOASYNC: |
736 | if (*(int *)data) |
737 | tp->tun_flags |= TUN_ASYNC; |
738 | else |
739 | tp->tun_flags &= ~TUN_ASYNC; |
740 | break; |
741 | |
742 | case FIONREAD: |
743 | if (tp->tun_if.if_snd.ifq_head) |
744 | *(int *)data = tp->tun_if.if_snd.ifq_head->m_pkthdr.len; |
745 | else |
746 | *(int *)data = 0; |
747 | break; |
748 | |
749 | case TIOCSPGRP: |
750 | case FIOSETOWN: |
751 | error = fsetown(&tp->tun_pgid, cmd, data); |
752 | break; |
753 | |
754 | case TIOCGPGRP: |
755 | case FIOGETOWN: |
756 | error = fgetown(tp->tun_pgid, cmd, data); |
757 | break; |
758 | |
759 | default: |
760 | error = ENOTTY; |
761 | } |
762 | |
763 | out: |
764 | mutex_exit(&tp->tun_lock); |
765 | out_nolock: |
766 | splx(s); |
767 | return (error); |
768 | } |
769 | |
770 | /* |
771 | * The cdevsw read interface - reads a packet at a time, or at |
772 | * least as much of a packet as can be read. |
773 | */ |
774 | int |
775 | tunread(dev_t dev, struct uio *uio, int ioflag) |
776 | { |
777 | struct tun_softc *tp; |
778 | struct ifnet *ifp; |
779 | struct mbuf *m, *m0; |
780 | int error = 0, len, s, index; |
781 | |
782 | s = splnet(); |
783 | tp = tun_find_unit(dev); |
784 | |
785 | /* interface was "destroyed" already */ |
786 | if (tp == NULL) { |
787 | error = ENXIO; |
788 | goto out_nolock; |
789 | } |
790 | |
791 | index = tp->tun_if.if_index; |
792 | ifp = &tp->tun_if; |
793 | |
794 | TUNDEBUG ("%s: read\n" , ifp->if_xname); |
795 | if ((tp->tun_flags & TUN_READY) != TUN_READY) { |
796 | TUNDEBUG ("%s: not ready 0%o\n" , ifp->if_xname, tp->tun_flags); |
797 | error = EHOSTDOWN; |
798 | goto out; |
799 | } |
800 | |
801 | tp->tun_flags &= ~TUN_RWAIT; |
802 | |
803 | do { |
804 | IFQ_DEQUEUE(&ifp->if_snd, m0); |
805 | if (m0 == 0) { |
806 | if (tp->tun_flags & TUN_NBIO) { |
807 | error = EWOULDBLOCK; |
808 | goto out; |
809 | } |
810 | tp->tun_flags |= TUN_RWAIT; |
811 | if (mtsleep((void *)tp, PZERO|PCATCH|PNORELOCK, |
812 | "tunread" , 0, &tp->tun_lock) != 0) { |
813 | error = EINTR; |
814 | goto out_nolock; |
815 | } else { |
816 | /* |
817 | * Maybe the interface was destroyed while |
818 | * we were sleeping, so let's ensure that |
819 | * we're looking at the same (valid) tun |
820 | * interface before looping. |
821 | */ |
822 | tp = tun_find_unit(dev); |
823 | if (tp == NULL) { |
824 | error = ENXIO; |
825 | goto out_nolock; |
826 | } |
827 | if (tp->tun_if.if_index != index) { |
828 | error = ENXIO; |
829 | goto out; |
830 | } |
831 | } |
832 | } |
833 | } while (m0 == 0); |
834 | |
835 | mutex_exit(&tp->tun_lock); |
836 | splx(s); |
837 | |
838 | /* Copy the mbuf chain */ |
839 | while (m0 && uio->uio_resid > 0 && error == 0) { |
840 | len = min(uio->uio_resid, m0->m_len); |
841 | if (len != 0) |
842 | error = uiomove(mtod(m0, void *), len, uio); |
843 | m0 = m = m_free(m0); |
844 | } |
845 | |
846 | if (m0) { |
847 | TUNDEBUG("Dropping mbuf\n" ); |
848 | m_freem(m0); |
849 | } |
850 | if (error) |
851 | ifp->if_ierrors++; |
852 | |
853 | return (error); |
854 | |
855 | out: |
856 | mutex_exit(&tp->tun_lock); |
857 | out_nolock: |
858 | splx(s); |
859 | return (error); |
860 | } |
861 | |
862 | /* |
863 | * the cdevsw write interface - an atomic write is a packet - or else! |
864 | */ |
865 | int |
866 | tunwrite(dev_t dev, struct uio *uio, int ioflag) |
867 | { |
868 | struct tun_softc *tp; |
869 | struct ifnet *ifp; |
870 | struct mbuf *top, **mp, *m; |
871 | pktqueue_t *pktq; |
872 | struct sockaddr dst; |
873 | int error = 0, s, tlen, mlen; |
874 | uint32_t family; |
875 | |
876 | s = splnet(); |
877 | tp = tun_find_unit(dev); |
878 | |
879 | /* interface was "destroyed" already */ |
880 | if (tp == NULL) { |
881 | error = ENXIO; |
882 | goto out_nolock; |
883 | } |
884 | |
885 | /* Unlock until we've got the data */ |
886 | mutex_exit(&tp->tun_lock); |
887 | splx(s); |
888 | |
889 | ifp = &tp->tun_if; |
890 | |
891 | TUNDEBUG("%s: tunwrite\n" , ifp->if_xname); |
892 | |
893 | if (tp->tun_flags & TUN_PREPADDR) { |
894 | if (uio->uio_resid < sizeof(dst)) { |
895 | error = EIO; |
896 | goto out0; |
897 | } |
898 | error = uiomove((void *)&dst, sizeof(dst), uio); |
899 | if (dst.sa_len > sizeof(dst)) { |
900 | /* Duh.. */ |
901 | char discard; |
902 | int n = dst.sa_len - sizeof(dst); |
903 | while (n--) |
904 | if ((error = uiomove(&discard, 1, uio)) != 0) { |
905 | goto out0; |
906 | } |
907 | } |
908 | } else if (tp->tun_flags & TUN_IFHEAD) { |
909 | if (uio->uio_resid < sizeof(family)){ |
910 | error = EIO; |
911 | goto out0; |
912 | } |
913 | error = uiomove((void *)&family, sizeof(family), uio); |
914 | dst.sa_family = ntohl(family); |
915 | } else { |
916 | #ifdef INET |
917 | dst.sa_family = AF_INET; |
918 | #endif |
919 | } |
920 | |
921 | if (uio->uio_resid > TUNMTU) { |
922 | TUNDEBUG("%s: len=%lu!\n" , ifp->if_xname, |
923 | (unsigned long)uio->uio_resid); |
924 | error = EIO; |
925 | goto out0; |
926 | } |
927 | |
928 | switch (dst.sa_family) { |
929 | #ifdef INET |
930 | case AF_INET: |
931 | pktq = ip_pktq; |
932 | break; |
933 | #endif |
934 | #ifdef INET6 |
935 | case AF_INET6: |
936 | pktq = ip6_pktq; |
937 | break; |
938 | #endif |
939 | default: |
940 | error = EAFNOSUPPORT; |
941 | goto out0; |
942 | } |
943 | |
944 | tlen = uio->uio_resid; |
945 | |
946 | /* get a header mbuf */ |
947 | MGETHDR(m, M_DONTWAIT, MT_DATA); |
948 | if (m == NULL) { |
949 | error = ENOBUFS; |
950 | goto out0; |
951 | } |
952 | mlen = MHLEN; |
953 | |
954 | top = NULL; |
955 | mp = ⊤ |
956 | while (error == 0 && uio->uio_resid > 0) { |
957 | m->m_len = min(mlen, uio->uio_resid); |
958 | error = uiomove(mtod(m, void *), m->m_len, uio); |
959 | *mp = m; |
960 | mp = &m->m_next; |
961 | if (error == 0 && uio->uio_resid > 0) { |
962 | MGET(m, M_DONTWAIT, MT_DATA); |
963 | if (m == NULL) { |
964 | error = ENOBUFS; |
965 | break; |
966 | } |
967 | mlen = MLEN; |
968 | } |
969 | } |
970 | if (error) { |
971 | if (top != NULL) |
972 | m_freem (top); |
973 | ifp->if_ierrors++; |
974 | goto out0; |
975 | } |
976 | |
977 | top->m_pkthdr.len = tlen; |
978 | m_set_rcvif(top, ifp); |
979 | |
980 | bpf_mtap_af(ifp, dst.sa_family, top); |
981 | |
982 | s = splnet(); |
983 | mutex_enter(&tp->tun_lock); |
984 | if ((tp->tun_flags & TUN_INITED) == 0) { |
985 | /* Interface was destroyed */ |
986 | error = ENXIO; |
987 | goto out; |
988 | } |
989 | if (__predict_false(!pktq_enqueue(pktq, top, 0))) { |
990 | ifp->if_collisions++; |
991 | mutex_exit(&tp->tun_lock); |
992 | error = ENOBUFS; |
993 | m_freem(top); |
994 | goto out_nolock; |
995 | } |
996 | ifp->if_ipackets++; |
997 | ifp->if_ibytes += tlen; |
998 | out: |
999 | mutex_exit(&tp->tun_lock); |
1000 | out_nolock: |
1001 | splx(s); |
1002 | out0: |
1003 | return (error); |
1004 | } |
1005 | |
1006 | #ifdef ALTQ |
1007 | /* |
1008 | * Start packet transmission on the interface. |
1009 | * when the interface queue is rate-limited by ALTQ or TBR, |
1010 | * if_start is needed to drain packets from the queue in order |
1011 | * to notify readers when outgoing packets become ready. |
1012 | * |
1013 | * Should be called at splnet. |
1014 | */ |
1015 | static void |
1016 | tunstart(struct ifnet *ifp) |
1017 | { |
1018 | struct tun_softc *tp = ifp->if_softc; |
1019 | |
1020 | if (!ALTQ_IS_ENABLED(&ifp->if_snd) && !TBR_IS_ENABLED(&ifp->if_snd)) |
1021 | return; |
1022 | |
1023 | mutex_enter(&tp->tun_lock); |
1024 | if (!IF_IS_EMPTY(&ifp->if_snd)) { |
1025 | if (tp->tun_flags & TUN_RWAIT) { |
1026 | tp->tun_flags &= ~TUN_RWAIT; |
1027 | wakeup((void *)tp); |
1028 | } |
1029 | if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid) |
1030 | softint_schedule(tp->tun_osih); |
1031 | |
1032 | selnotify(&tp->tun_rsel, 0, 0); |
1033 | } |
1034 | mutex_exit(&tp->tun_lock); |
1035 | } |
1036 | #endif /* ALTQ */ |
1037 | /* |
1038 | * tunpoll - the poll interface, this is only useful on reads |
1039 | * really. The write detect always returns true, write never blocks |
1040 | * anyway, it either accepts the packet or drops it. |
1041 | */ |
1042 | int |
1043 | tunpoll(dev_t dev, int events, struct lwp *l) |
1044 | { |
1045 | struct tun_softc *tp; |
1046 | struct ifnet *ifp; |
1047 | int s, revents = 0; |
1048 | |
1049 | s = splnet(); |
1050 | tp = tun_find_unit(dev); |
1051 | |
1052 | /* interface was "destroyed" already */ |
1053 | if (tp == NULL) |
1054 | goto out_nolock; |
1055 | |
1056 | ifp = &tp->tun_if; |
1057 | |
1058 | TUNDEBUG("%s: tunpoll\n" , ifp->if_xname); |
1059 | |
1060 | if (events & (POLLIN | POLLRDNORM)) { |
1061 | if (!IFQ_IS_EMPTY(&ifp->if_snd)) { |
1062 | TUNDEBUG("%s: tunpoll q=%d\n" , ifp->if_xname, |
1063 | ifp->if_snd.ifq_len); |
1064 | revents |= events & (POLLIN | POLLRDNORM); |
1065 | } else { |
1066 | TUNDEBUG("%s: tunpoll waiting\n" , ifp->if_xname); |
1067 | selrecord(l, &tp->tun_rsel); |
1068 | } |
1069 | } |
1070 | |
1071 | if (events & (POLLOUT | POLLWRNORM)) |
1072 | revents |= events & (POLLOUT | POLLWRNORM); |
1073 | |
1074 | mutex_exit(&tp->tun_lock); |
1075 | out_nolock: |
1076 | splx(s); |
1077 | return (revents); |
1078 | } |
1079 | |
1080 | static void |
1081 | filt_tunrdetach(struct knote *kn) |
1082 | { |
1083 | struct tun_softc *tp = kn->kn_hook; |
1084 | int s; |
1085 | |
1086 | s = splnet(); |
1087 | SLIST_REMOVE(&tp->tun_rsel.sel_klist, kn, knote, kn_selnext); |
1088 | splx(s); |
1089 | } |
1090 | |
1091 | static int |
1092 | filt_tunread(struct knote *kn, long hint) |
1093 | { |
1094 | struct tun_softc *tp = kn->kn_hook; |
1095 | struct ifnet *ifp = &tp->tun_if; |
1096 | struct mbuf *m; |
1097 | int s; |
1098 | |
1099 | s = splnet(); |
1100 | IF_POLL(&ifp->if_snd, m); |
1101 | if (m == NULL) { |
1102 | splx(s); |
1103 | return (0); |
1104 | } |
1105 | |
1106 | for (kn->kn_data = 0; m != NULL; m = m->m_next) |
1107 | kn->kn_data += m->m_len; |
1108 | |
1109 | splx(s); |
1110 | return (1); |
1111 | } |
1112 | |
1113 | static const struct filterops tunread_filtops = |
1114 | { 1, NULL, filt_tunrdetach, filt_tunread }; |
1115 | |
1116 | static const struct filterops tun_seltrue_filtops = |
1117 | { 1, NULL, filt_tunrdetach, filt_seltrue }; |
1118 | |
1119 | int |
1120 | tunkqfilter(dev_t dev, struct knote *kn) |
1121 | { |
1122 | struct tun_softc *tp; |
1123 | struct klist *klist; |
1124 | int rv = 0, s; |
1125 | |
1126 | s = splnet(); |
1127 | tp = tun_find_unit(dev); |
1128 | if (tp == NULL) |
1129 | goto out_nolock; |
1130 | |
1131 | switch (kn->kn_filter) { |
1132 | case EVFILT_READ: |
1133 | klist = &tp->tun_rsel.sel_klist; |
1134 | kn->kn_fop = &tunread_filtops; |
1135 | break; |
1136 | |
1137 | case EVFILT_WRITE: |
1138 | klist = &tp->tun_rsel.sel_klist; |
1139 | kn->kn_fop = &tun_seltrue_filtops; |
1140 | break; |
1141 | |
1142 | default: |
1143 | rv = EINVAL; |
1144 | goto out; |
1145 | } |
1146 | |
1147 | kn->kn_hook = tp; |
1148 | |
1149 | SLIST_INSERT_HEAD(klist, kn, kn_selnext); |
1150 | |
1151 | out: |
1152 | mutex_exit(&tp->tun_lock); |
1153 | out_nolock: |
1154 | splx(s); |
1155 | return (rv); |
1156 | } |
1157 | |
1158 | /* |
1159 | * Module infrastructure |
1160 | */ |
1161 | #include "if_module.h" |
1162 | |
1163 | IF_MODULE(MODULE_CLASS_DRIVER, tun, "" ) |
1164 | |