if_tun.c revision 1.63 1 1.62 darrenr /* $NetBSD: if_tun.c,v 1.63 2003/06/29 22:31:51 fvdl Exp $ */
2 1.14 cgd
3 1.1 cgd /*
4 1.8 deraadt * Copyright (c) 1988, Julian Onions <jpo (at) cs.nott.ac.uk>
5 1.8 deraadt * Nottingham University 1987.
6 1.1 cgd *
7 1.1 cgd * This source may be freely distributed, however I would be interested
8 1.1 cgd * in any changes that are made.
9 1.6 deraadt *
10 1.1 cgd * This driver takes packets off the IP i/f and hands them up to a
11 1.21 scottr * user process to have its wicked way with. This driver has its
12 1.1 cgd * roots in a similar driver written by Phil Cockcroft (formerly) at
13 1.27 mycroft * UCL. This driver is based much more on read/write/poll mode of
14 1.1 cgd * operation though.
15 1.1 cgd */
16 1.48 lukem
17 1.48 lukem #include <sys/cdefs.h>
18 1.62 darrenr __KERNEL_RCSID(0, "$NetBSD: if_tun.c,v 1.63 2003/06/29 22:31:51 fvdl Exp $");
19 1.1 cgd
20 1.8 deraadt #include "tun.h"
21 1.33 jonathan
22 1.33 jonathan #include "opt_inet.h"
23 1.34 jonathan #include "opt_ns.h"
24 1.8 deraadt
25 1.6 deraadt #include <sys/param.h>
26 1.8 deraadt #include <sys/proc.h>
27 1.6 deraadt #include <sys/systm.h>
28 1.6 deraadt #include <sys/mbuf.h>
29 1.6 deraadt #include <sys/buf.h>
30 1.6 deraadt #include <sys/protosw.h>
31 1.6 deraadt #include <sys/socket.h>
32 1.6 deraadt #include <sys/ioctl.h>
33 1.6 deraadt #include <sys/errno.h>
34 1.6 deraadt #include <sys/syslog.h>
35 1.6 deraadt #include <sys/select.h>
36 1.27 mycroft #include <sys/poll.h>
37 1.8 deraadt #include <sys/file.h>
38 1.22 christos #include <sys/signalvar.h>
39 1.23 christos #include <sys/conf.h>
40 1.9 deraadt
41 1.9 deraadt #include <machine/cpu.h>
42 1.6 deraadt
43 1.6 deraadt #include <net/if.h>
44 1.30 is #include <net/if_ether.h>
45 1.6 deraadt #include <net/netisr.h>
46 1.6 deraadt #include <net/route.h>
47 1.1 cgd
48 1.30 is
49 1.1 cgd #ifdef INET
50 1.6 deraadt #include <netinet/in.h>
51 1.6 deraadt #include <netinet/in_systm.h>
52 1.6 deraadt #include <netinet/in_var.h>
53 1.6 deraadt #include <netinet/ip.h>
54 1.30 is #include <netinet/if_inarp.h>
55 1.1 cgd #endif
56 1.1 cgd
57 1.1 cgd #ifdef NS
58 1.6 deraadt #include <netns/ns.h>
59 1.6 deraadt #include <netns/ns_if.h>
60 1.1 cgd #endif
61 1.1 cgd
62 1.8 deraadt #include "bpfilter.h"
63 1.8 deraadt #if NBPFILTER > 0
64 1.8 deraadt #include <sys/time.h>
65 1.8 deraadt #include <net/bpf.h>
66 1.8 deraadt #endif
67 1.8 deraadt
68 1.8 deraadt #include <net/if_tun.h>
69 1.8 deraadt
70 1.29 christos #define TUNDEBUG if (tundebug) printf
71 1.6 deraadt int tundebug = 0;
72 1.1 cgd
73 1.6 deraadt extern int ifqmaxlen;
74 1.22 christos void tunattach __P((int));
75 1.46 atatat LIST_HEAD(, tun_softc) tun_softc_list;
76 1.46 atatat static struct simplelock tun_softc_lock;
77 1.6 deraadt
78 1.22 christos int tun_ioctl __P((struct ifnet *, u_long, caddr_t));
79 1.22 christos int tun_output __P((struct ifnet *, struct mbuf *, struct sockaddr *,
80 1.22 christos struct rtentry *rt));
81 1.46 atatat int tun_clone_create __P((struct if_clone *, int));
82 1.46 atatat void tun_clone_destroy __P((struct ifnet *));
83 1.6 deraadt
84 1.46 atatat struct if_clone tun_cloner =
85 1.46 atatat IF_CLONE_INITIALIZER("tun", tun_clone_create, tun_clone_destroy);
86 1.46 atatat
87 1.46 atatat static void tunattach0 __P((struct tun_softc *));
88 1.26 pk static void tuninit __P((struct tun_softc *));
89 1.50 itojun #ifdef ALTQ
90 1.50 itojun static void tunstart __P((struct ifnet *));
91 1.50 itojun #endif
92 1.46 atatat static struct tun_softc *tun_find_unit __P((dev_t));
93 1.53 gehenna
94 1.53 gehenna dev_type_open(tunopen);
95 1.53 gehenna dev_type_close(tunclose);
96 1.53 gehenna dev_type_read(tunread);
97 1.53 gehenna dev_type_write(tunwrite);
98 1.53 gehenna dev_type_ioctl(tunioctl);
99 1.53 gehenna dev_type_poll(tunpoll);
100 1.56 jdolecek dev_type_kqfilter(tunkqfilter);
101 1.53 gehenna
102 1.53 gehenna const struct cdevsw tun_cdevsw = {
103 1.53 gehenna tunopen, tunclose, tunread, tunwrite, tunioctl,
104 1.56 jdolecek nostop, notty, tunpoll, nommap, tunkqfilter,
105 1.53 gehenna };
106 1.6 deraadt
107 1.8 deraadt void
108 1.8 deraadt tunattach(unused)
109 1.8 deraadt int unused;
110 1.8 deraadt {
111 1.46 atatat
112 1.46 atatat simple_lock_init(&tun_softc_lock);
113 1.46 atatat LIST_INIT(&tun_softc_list);
114 1.46 atatat if_clone_attach(&tun_cloner);
115 1.46 atatat }
116 1.46 atatat
117 1.46 atatat int
118 1.46 atatat tun_clone_create(ifc, unit)
119 1.46 atatat struct if_clone *ifc;
120 1.46 atatat int unit;
121 1.46 atatat {
122 1.46 atatat struct tun_softc *sc;
123 1.46 atatat
124 1.46 atatat sc = malloc(sizeof(struct tun_softc), M_DEVBUF, M_WAITOK);
125 1.46 atatat (void)memset(sc, 0, sizeof(struct tun_softc));
126 1.46 atatat
127 1.46 atatat (void)snprintf(sc->tun_if.if_xname, sizeof(sc->tun_if.if_xname),
128 1.46 atatat "%s%d", ifc->ifc_name, unit);
129 1.46 atatat sc->tun_unit = unit;
130 1.46 atatat simple_lock_init(&sc->tun_lock);
131 1.46 atatat
132 1.46 atatat tunattach0(sc);
133 1.46 atatat
134 1.46 atatat simple_lock(&tun_softc_lock);
135 1.46 atatat LIST_INSERT_HEAD(&tun_softc_list, sc, tun_list);
136 1.46 atatat simple_unlock(&tun_softc_lock);
137 1.46 atatat
138 1.46 atatat return (0);
139 1.46 atatat }
140 1.46 atatat
141 1.46 atatat void
142 1.46 atatat tunattach0(sc)
143 1.46 atatat struct tun_softc *sc;
144 1.46 atatat {
145 1.46 atatat struct ifnet *ifp = (void *)sc;
146 1.46 atatat
147 1.46 atatat sc->tun_flags = TUN_INITED;
148 1.46 atatat
149 1.46 atatat ifp = &sc->tun_if;
150 1.46 atatat ifp->if_softc = sc;
151 1.46 atatat ifp->if_mtu = TUNMTU;
152 1.46 atatat ifp->if_ioctl = tun_ioctl;
153 1.46 atatat ifp->if_output = tun_output;
154 1.50 itojun #ifdef ALTQ
155 1.50 itojun ifp->if_start = tunstart;
156 1.50 itojun #endif
157 1.46 atatat ifp->if_flags = IFF_POINTOPOINT;
158 1.46 atatat ifp->if_snd.ifq_maxlen = ifqmaxlen;
159 1.46 atatat ifp->if_collisions = 0;
160 1.46 atatat ifp->if_ierrors = 0;
161 1.46 atatat ifp->if_oerrors = 0;
162 1.46 atatat ifp->if_ipackets = 0;
163 1.46 atatat ifp->if_opackets = 0;
164 1.58 jdolecek ifp->if_ibytes = 0;
165 1.58 jdolecek ifp->if_obytes = 0;
166 1.46 atatat ifp->if_dlt = DLT_NULL;
167 1.50 itojun IFQ_SET_READY(&ifp->if_snd);
168 1.46 atatat if_attach(ifp);
169 1.46 atatat if_alloc_sadl(ifp);
170 1.46 atatat #if NBPFILTER > 0
171 1.46 atatat bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
172 1.46 atatat #endif
173 1.46 atatat }
174 1.46 atatat
175 1.46 atatat void
176 1.46 atatat tun_clone_destroy(ifp)
177 1.8 deraadt struct ifnet *ifp;
178 1.46 atatat {
179 1.46 atatat struct tun_softc *tp = (void *)ifp;
180 1.46 atatat struct proc *p;
181 1.8 deraadt
182 1.46 atatat simple_lock(&tun_softc_lock);
183 1.46 atatat simple_lock(&tp->tun_lock);
184 1.46 atatat LIST_REMOVE(tp, tun_list);
185 1.46 atatat simple_unlock(&tp->tun_lock);
186 1.46 atatat simple_unlock(&tun_softc_lock);
187 1.46 atatat
188 1.46 atatat if (tp->tun_flags & TUN_RWAIT) {
189 1.46 atatat tp->tun_flags &= ~TUN_RWAIT;
190 1.46 atatat wakeup((caddr_t)tp);
191 1.46 atatat }
192 1.46 atatat if (tp->tun_flags & TUN_ASYNC && tp->tun_pgrp) {
193 1.46 atatat if (tp->tun_pgrp > 0)
194 1.46 atatat gsignal(tp->tun_pgrp, SIGIO);
195 1.46 atatat else if ((p = pfind(-tp->tun_pgrp)) != NULL)
196 1.46 atatat psignal(p, SIGIO);
197 1.46 atatat }
198 1.46 atatat selwakeup(&tp->tun_rsel);
199 1.8 deraadt
200 1.8 deraadt #if NBPFILTER > 0
201 1.46 atatat bpfdetach(ifp);
202 1.8 deraadt #endif
203 1.46 atatat if_detach(ifp);
204 1.46 atatat
205 1.46 atatat free(tp, M_DEVBUF);
206 1.46 atatat }
207 1.46 atatat
208 1.46 atatat static struct tun_softc *
209 1.46 atatat tun_find_unit(dev)
210 1.46 atatat dev_t dev;
211 1.46 atatat {
212 1.46 atatat struct tun_softc *tp;
213 1.46 atatat int unit = minor(dev);
214 1.46 atatat
215 1.46 atatat simple_lock(&tun_softc_lock);
216 1.46 atatat LIST_FOREACH(tp, &tun_softc_list, tun_list)
217 1.46 atatat if (unit == tp->tun_unit)
218 1.46 atatat break;
219 1.46 atatat if (tp)
220 1.46 atatat simple_lock(&tp->tun_lock);
221 1.46 atatat simple_unlock(&tun_softc_lock);
222 1.46 atatat
223 1.46 atatat return (tp);
224 1.8 deraadt }
225 1.8 deraadt
226 1.6 deraadt /*
227 1.6 deraadt * tunnel open - must be superuser & the device must be
228 1.6 deraadt * configured in
229 1.6 deraadt */
230 1.6 deraadt int
231 1.63 fvdl tunopen(dev, flag, mode, p)
232 1.6 deraadt dev_t dev;
233 1.6 deraadt int flag, mode;
234 1.63 fvdl struct proc *p;
235 1.6 deraadt {
236 1.6 deraadt struct ifnet *ifp;
237 1.8 deraadt struct tun_softc *tp;
238 1.46 atatat int error;
239 1.1 cgd
240 1.22 christos if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
241 1.5 deraadt return (error);
242 1.5 deraadt
243 1.46 atatat if (NTUN < 1)
244 1.6 deraadt return (ENXIO);
245 1.46 atatat
246 1.46 atatat tp = tun_find_unit(dev);
247 1.52 atatat
248 1.52 atatat if (!tp) {
249 1.52 atatat (void)tun_clone_create(&tun_cloner, minor(dev));
250 1.52 atatat tp = tun_find_unit(dev);
251 1.52 atatat }
252 1.46 atatat
253 1.46 atatat if (!tp)
254 1.46 atatat return (ENXIO);
255 1.46 atatat
256 1.46 atatat if (tp->tun_flags & TUN_OPEN) {
257 1.46 atatat simple_unlock(&tp->tun_lock);
258 1.46 atatat return (EBUSY);
259 1.46 atatat }
260 1.46 atatat
261 1.6 deraadt ifp = &tp->tun_if;
262 1.6 deraadt tp->tun_flags |= TUN_OPEN;
263 1.24 thorpej TUNDEBUG("%s: open\n", ifp->if_xname);
264 1.46 atatat simple_unlock(&tp->tun_lock);
265 1.6 deraadt return (0);
266 1.1 cgd }
267 1.1 cgd
268 1.6 deraadt /*
269 1.6 deraadt * tunclose - close the device - mark i/f down & delete
270 1.6 deraadt * routing info
271 1.6 deraadt */
272 1.6 deraadt int
273 1.63 fvdl tunclose(dev, flag, mode, p)
274 1.6 deraadt dev_t dev;
275 1.6 deraadt int flag;
276 1.22 christos int mode;
277 1.63 fvdl struct proc *p;
278 1.6 deraadt {
279 1.46 atatat int s;
280 1.46 atatat struct tun_softc *tp;
281 1.46 atatat struct ifnet *ifp;
282 1.6 deraadt
283 1.46 atatat tp = tun_find_unit(dev);
284 1.46 atatat
285 1.46 atatat /* interface was "destroyed" before the close */
286 1.46 atatat if (tp == NULL)
287 1.46 atatat return (0);
288 1.46 atatat
289 1.46 atatat ifp = &tp->tun_if;
290 1.46 atatat
291 1.10 andrew tp->tun_flags &= ~TUN_OPEN;
292 1.6 deraadt
293 1.6 deraadt /*
294 1.6 deraadt * junk all pending output
295 1.6 deraadt */
296 1.50 itojun s = splnet();
297 1.50 itojun IFQ_PURGE(&ifp->if_snd);
298 1.50 itojun splx(s);
299 1.6 deraadt
300 1.6 deraadt if (ifp->if_flags & IFF_UP) {
301 1.43 thorpej s = splnet();
302 1.6 deraadt if_down(ifp);
303 1.8 deraadt if (ifp->if_flags & IFF_RUNNING) {
304 1.17 mycroft /* find internet addresses and delete routes */
305 1.39 augustss struct ifaddr *ifa;
306 1.47 matt TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
307 1.38 itojun #ifdef INET
308 1.18 mycroft if (ifa->ifa_addr->sa_family == AF_INET) {
309 1.18 mycroft rtinit(ifa, (int)RTM_DELETE,
310 1.26 pk tp->tun_flags & TUN_DSTADDR
311 1.26 pk ? RTF_HOST
312 1.26 pk : 0);
313 1.18 mycroft }
314 1.38 itojun #endif
315 1.11 deraadt }
316 1.8 deraadt }
317 1.6 deraadt splx(s);
318 1.6 deraadt }
319 1.6 deraadt tp->tun_pgrp = 0;
320 1.56 jdolecek selnotify(&tp->tun_rsel, 0);
321 1.6 deraadt
322 1.24 thorpej TUNDEBUG ("%s: closed\n", ifp->if_xname);
323 1.46 atatat simple_unlock(&tp->tun_lock);
324 1.6 deraadt return (0);
325 1.1 cgd }
326 1.1 cgd
327 1.26 pk static void
328 1.24 thorpej tuninit(tp)
329 1.24 thorpej struct tun_softc *tp;
330 1.6 deraadt {
331 1.6 deraadt struct ifnet *ifp = &tp->tun_if;
332 1.46 atatat struct ifaddr *ifa;
333 1.8 deraadt
334 1.24 thorpej TUNDEBUG("%s: tuninit\n", ifp->if_xname);
335 1.6 deraadt
336 1.6 deraadt ifp->if_flags |= IFF_UP | IFF_RUNNING;
337 1.8 deraadt
338 1.26 pk tp->tun_flags &= ~(TUN_IASET|TUN_DSTADDR);
339 1.47 matt TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
340 1.38 itojun #ifdef INET
341 1.11 deraadt if (ifa->ifa_addr->sa_family == AF_INET) {
342 1.17 mycroft struct sockaddr_in *sin;
343 1.11 deraadt
344 1.17 mycroft sin = satosin(ifa->ifa_addr);
345 1.17 mycroft if (sin && sin->sin_addr.s_addr)
346 1.17 mycroft tp->tun_flags |= TUN_IASET;
347 1.17 mycroft
348 1.26 pk if (ifp->if_flags & IFF_POINTOPOINT) {
349 1.26 pk sin = satosin(ifa->ifa_dstaddr);
350 1.26 pk if (sin && sin->sin_addr.s_addr)
351 1.26 pk tp->tun_flags |= TUN_DSTADDR;
352 1.26 pk }
353 1.11 deraadt }
354 1.38 itojun #endif
355 1.18 mycroft }
356 1.8 deraadt
357 1.26 pk return;
358 1.1 cgd }
359 1.1 cgd
360 1.1 cgd /*
361 1.1 cgd * Process an ioctl request.
362 1.1 cgd */
363 1.1 cgd int
364 1.22 christos tun_ioctl(ifp, cmd, data)
365 1.6 deraadt struct ifnet *ifp;
366 1.25 mycroft u_long cmd;
367 1.6 deraadt caddr_t data;
368 1.6 deraadt {
369 1.6 deraadt int error = 0, s;
370 1.46 atatat struct tun_softc *tp = (struct tun_softc *)(ifp->if_softc);
371 1.46 atatat
372 1.46 atatat simple_lock(&tp->tun_lock);
373 1.6 deraadt
374 1.43 thorpej s = splnet();
375 1.61 itojun switch (cmd) {
376 1.6 deraadt case SIOCSIFADDR:
377 1.24 thorpej tuninit((struct tun_softc *)(ifp->if_softc));
378 1.24 thorpej TUNDEBUG("%s: address set\n", ifp->if_xname);
379 1.6 deraadt break;
380 1.6 deraadt case SIOCSIFDSTADDR:
381 1.24 thorpej tuninit((struct tun_softc *)(ifp->if_softc));
382 1.24 thorpej TUNDEBUG("%s: destination address set\n", ifp->if_xname);
383 1.6 deraadt break;
384 1.26 pk case SIOCSIFBRDADDR:
385 1.26 pk TUNDEBUG("%s: broadcast address set\n", ifp->if_xname);
386 1.26 pk break;
387 1.31 matt case SIOCSIFMTU: {
388 1.31 matt struct ifreq *ifr = (struct ifreq *) data;
389 1.31 matt if (ifr->ifr_mtu > TUNMTU || ifr->ifr_mtu < 576) {
390 1.31 matt error = EINVAL;
391 1.31 matt break;
392 1.31 matt }
393 1.31 matt TUNDEBUG("%s: interface mtu set\n", ifp->if_xname);
394 1.31 matt ifp->if_mtu = ifr->ifr_mtu;
395 1.32 matt break;
396 1.32 matt }
397 1.32 matt case SIOCADDMULTI:
398 1.32 matt case SIOCDELMULTI: {
399 1.32 matt struct ifreq *ifr = (struct ifreq *) data;
400 1.32 matt if (ifr == 0) {
401 1.32 matt error = EAFNOSUPPORT; /* XXX */
402 1.32 matt break;
403 1.32 matt }
404 1.32 matt switch (ifr->ifr_addr.sa_family) {
405 1.32 matt
406 1.32 matt #ifdef INET
407 1.32 matt case AF_INET:
408 1.32 matt break;
409 1.32 matt #endif
410 1.32 matt
411 1.32 matt default:
412 1.32 matt error = EAFNOSUPPORT;
413 1.32 matt break;
414 1.32 matt }
415 1.31 matt break;
416 1.31 matt }
417 1.38 itojun case SIOCSIFFLAGS:
418 1.38 itojun break;
419 1.6 deraadt default:
420 1.6 deraadt error = EINVAL;
421 1.6 deraadt }
422 1.6 deraadt splx(s);
423 1.46 atatat simple_unlock(&tp->tun_lock);
424 1.6 deraadt return (error);
425 1.1 cgd }
426 1.1 cgd
427 1.1 cgd /*
428 1.22 christos * tun_output - queue packets from higher level ready to put out.
429 1.1 cgd */
430 1.6 deraadt int
431 1.22 christos tun_output(ifp, m0, dst, rt)
432 1.6 deraadt struct ifnet *ifp;
433 1.6 deraadt struct mbuf *m0;
434 1.6 deraadt struct sockaddr *dst;
435 1.12 deraadt struct rtentry *rt;
436 1.6 deraadt {
437 1.24 thorpej struct tun_softc *tp = ifp->if_softc;
438 1.6 deraadt struct proc *p;
439 1.38 itojun #ifdef INET
440 1.6 deraadt int s;
441 1.51 itojun int error;
442 1.38 itojun #endif
443 1.58 jdolecek int mlen;
444 1.50 itojun ALTQ_DECL(struct altq_pktattr pktattr;)
445 1.6 deraadt
446 1.46 atatat simple_lock(&tp->tun_lock);
447 1.24 thorpej TUNDEBUG ("%s: tun_output\n", ifp->if_xname);
448 1.1 cgd
449 1.8 deraadt if ((tp->tun_flags & TUN_READY) != TUN_READY) {
450 1.24 thorpej TUNDEBUG ("%s: not ready 0%o\n", ifp->if_xname,
451 1.24 thorpej tp->tun_flags);
452 1.8 deraadt m_freem (m0);
453 1.46 atatat simple_unlock(&tp->tun_lock);
454 1.26 pk return (EHOSTDOWN);
455 1.8 deraadt }
456 1.8 deraadt
457 1.50 itojun /*
458 1.50 itojun * if the queueing discipline needs packet classification,
459 1.50 itojun * do it before prepending link headers.
460 1.50 itojun */
461 1.50 itojun IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr);
462 1.50 itojun
463 1.8 deraadt #if NBPFILTER > 0
464 1.40 thorpej if (ifp->if_bpf) {
465 1.8 deraadt /*
466 1.8 deraadt * We need to prepend the address family as
467 1.8 deraadt * a four byte field. Cons up a dummy header
468 1.8 deraadt * to pacify bpf. This is safe because bpf
469 1.8 deraadt * will only read from the mbuf (i.e., it won't
470 1.8 deraadt * try to free it or keep a pointer to it).
471 1.8 deraadt */
472 1.8 deraadt struct mbuf m;
473 1.16 cgd u_int32_t af = dst->sa_family;
474 1.8 deraadt
475 1.60 itojun m.m_flags = 0;
476 1.8 deraadt m.m_next = m0;
477 1.16 cgd m.m_len = sizeof(af);
478 1.8 deraadt m.m_data = (char *)⁡
479 1.8 deraadt
480 1.40 thorpej bpf_mtap(ifp->if_bpf, &m);
481 1.8 deraadt }
482 1.8 deraadt #endif
483 1.8 deraadt
484 1.6 deraadt switch(dst->sa_family) {
485 1.1 cgd #ifdef INET
486 1.6 deraadt case AF_INET:
487 1.26 pk if (tp->tun_flags & TUN_PREPADDR) {
488 1.26 pk /* Simple link-layer header */
489 1.26 pk M_PREPEND(m0, dst->sa_len, M_DONTWAIT);
490 1.26 pk if (m0 == NULL) {
491 1.26 pk IF_DROP(&ifp->if_snd);
492 1.46 atatat simple_unlock(&tp->tun_lock);
493 1.26 pk return (ENOBUFS);
494 1.26 pk }
495 1.26 pk bcopy(dst, mtod(m0, char *), dst->sa_len);
496 1.26 pk }
497 1.36 sommerfe /* FALLTHROUGH */
498 1.36 sommerfe case AF_UNSPEC:
499 1.43 thorpej s = splnet();
500 1.50 itojun IFQ_ENQUEUE(&ifp->if_snd, m0, &pktattr, error);
501 1.50 itojun if (error) {
502 1.6 deraadt splx(s);
503 1.6 deraadt ifp->if_collisions++;
504 1.50 itojun return (error);
505 1.6 deraadt }
506 1.58 jdolecek mlen = m0->m_pkthdr.len;
507 1.6 deraadt splx(s);
508 1.6 deraadt ifp->if_opackets++;
509 1.58 jdolecek ifp->if_obytes += mlen;
510 1.6 deraadt break;
511 1.1 cgd #endif
512 1.6 deraadt default:
513 1.6 deraadt m_freem(m0);
514 1.46 atatat simple_unlock(&tp->tun_lock);
515 1.26 pk return (EAFNOSUPPORT);
516 1.6 deraadt }
517 1.6 deraadt
518 1.6 deraadt if (tp->tun_flags & TUN_RWAIT) {
519 1.6 deraadt tp->tun_flags &= ~TUN_RWAIT;
520 1.6 deraadt wakeup((caddr_t)tp);
521 1.6 deraadt }
522 1.6 deraadt if (tp->tun_flags & TUN_ASYNC && tp->tun_pgrp) {
523 1.6 deraadt if (tp->tun_pgrp > 0)
524 1.6 deraadt gsignal(tp->tun_pgrp, SIGIO);
525 1.22 christos else if ((p = pfind(-tp->tun_pgrp)) != NULL)
526 1.6 deraadt psignal(p, SIGIO);
527 1.6 deraadt }
528 1.56 jdolecek selnotify(&tp->tun_rsel, 0);
529 1.46 atatat simple_unlock(&tp->tun_lock);
530 1.26 pk return (0);
531 1.1 cgd }
532 1.1 cgd
533 1.1 cgd /*
534 1.1 cgd * the cdevsw interface is now pretty minimal.
535 1.1 cgd */
536 1.6 deraadt int
537 1.63 fvdl tunioctl(dev, cmd, data, flag, p)
538 1.6 deraadt dev_t dev;
539 1.15 cgd u_long cmd;
540 1.6 deraadt caddr_t data;
541 1.6 deraadt int flag;
542 1.63 fvdl struct proc *p;
543 1.6 deraadt {
544 1.46 atatat int s;
545 1.46 atatat struct tun_softc *tp;
546 1.59 dsl pid_t pgid;
547 1.59 dsl int error;
548 1.46 atatat
549 1.46 atatat tp = tun_find_unit(dev);
550 1.46 atatat
551 1.46 atatat /* interface was "destroyed" already */
552 1.46 atatat if (tp == NULL)
553 1.46 atatat return (ENXIO);
554 1.6 deraadt
555 1.6 deraadt switch (cmd) {
556 1.6 deraadt case TUNSDEBUG:
557 1.6 deraadt tundebug = *(int *)data;
558 1.6 deraadt break;
559 1.26 pk
560 1.6 deraadt case TUNGDEBUG:
561 1.6 deraadt *(int *)data = tundebug;
562 1.6 deraadt break;
563 1.26 pk
564 1.26 pk case TUNSIFMODE:
565 1.31 matt switch (*(int *)data & (IFF_POINTOPOINT|IFF_BROADCAST)) {
566 1.26 pk case IFF_POINTOPOINT:
567 1.26 pk case IFF_BROADCAST:
568 1.43 thorpej s = splnet();
569 1.26 pk if (tp->tun_if.if_flags & IFF_UP) {
570 1.26 pk splx(s);
571 1.46 atatat simple_unlock(&tp->tun_lock);
572 1.26 pk return (EBUSY);
573 1.26 pk }
574 1.26 pk tp->tun_if.if_flags &=
575 1.31 matt ~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST);
576 1.26 pk tp->tun_if.if_flags |= *(int *)data;
577 1.26 pk splx(s);
578 1.26 pk break;
579 1.26 pk default:
580 1.46 atatat simple_unlock(&tp->tun_lock);
581 1.26 pk return (EINVAL);
582 1.26 pk }
583 1.26 pk break;
584 1.26 pk
585 1.26 pk case TUNSLMODE:
586 1.26 pk if (*(int *)data)
587 1.26 pk tp->tun_flags |= TUN_PREPADDR;
588 1.26 pk else
589 1.26 pk tp->tun_flags &= ~TUN_PREPADDR;
590 1.26 pk break;
591 1.26 pk
592 1.6 deraadt case FIONBIO:
593 1.6 deraadt if (*(int *)data)
594 1.6 deraadt tp->tun_flags |= TUN_NBIO;
595 1.6 deraadt else
596 1.6 deraadt tp->tun_flags &= ~TUN_NBIO;
597 1.6 deraadt break;
598 1.26 pk
599 1.6 deraadt case FIOASYNC:
600 1.6 deraadt if (*(int *)data)
601 1.6 deraadt tp->tun_flags |= TUN_ASYNC;
602 1.6 deraadt else
603 1.6 deraadt tp->tun_flags &= ~TUN_ASYNC;
604 1.6 deraadt break;
605 1.26 pk
606 1.6 deraadt case FIONREAD:
607 1.43 thorpej s = splnet();
608 1.6 deraadt if (tp->tun_if.if_snd.ifq_head)
609 1.19 pk *(int *)data = tp->tun_if.if_snd.ifq_head->m_pkthdr.len;
610 1.6 deraadt else
611 1.6 deraadt *(int *)data = 0;
612 1.6 deraadt splx(s);
613 1.6 deraadt break;
614 1.26 pk
615 1.6 deraadt case TIOCSPGRP:
616 1.59 dsl pgid = *(int *)data;
617 1.59 dsl if (pgid != 0) {
618 1.63 fvdl error = pgid_in_session(p, pgid);
619 1.59 dsl if (error != 0)
620 1.59 dsl return error;
621 1.59 dsl }
622 1.59 dsl tp->tun_pgrp = pgid;
623 1.6 deraadt break;
624 1.26 pk
625 1.6 deraadt case TIOCGPGRP:
626 1.6 deraadt *(int *)data = tp->tun_pgrp;
627 1.6 deraadt break;
628 1.26 pk
629 1.6 deraadt default:
630 1.46 atatat simple_unlock(&tp->tun_lock);
631 1.6 deraadt return (ENOTTY);
632 1.6 deraadt }
633 1.46 atatat simple_unlock(&tp->tun_lock);
634 1.6 deraadt return (0);
635 1.1 cgd }
636 1.1 cgd
637 1.1 cgd /*
638 1.6 deraadt * The cdevsw read interface - reads a packet at a time, or at
639 1.6 deraadt * least as much of a packet as can be read.
640 1.1 cgd */
641 1.6 deraadt int
642 1.22 christos tunread(dev, uio, ioflag)
643 1.6 deraadt dev_t dev;
644 1.6 deraadt struct uio *uio;
645 1.22 christos int ioflag;
646 1.6 deraadt {
647 1.46 atatat struct tun_softc *tp;
648 1.46 atatat struct ifnet *ifp;
649 1.6 deraadt struct mbuf *m, *m0;
650 1.46 atatat int error=0, len, s, index;
651 1.46 atatat
652 1.46 atatat tp = tun_find_unit(dev);
653 1.46 atatat
654 1.46 atatat /* interface was "destroyed" already */
655 1.46 atatat if (tp == NULL)
656 1.46 atatat return (ENXIO);
657 1.46 atatat
658 1.46 atatat index = tp->tun_if.if_index;
659 1.46 atatat ifp = &tp->tun_if;
660 1.6 deraadt
661 1.24 thorpej TUNDEBUG ("%s: read\n", ifp->if_xname);
662 1.8 deraadt if ((tp->tun_flags & TUN_READY) != TUN_READY) {
663 1.26 pk TUNDEBUG ("%s: not ready 0%o\n", ifp->if_xname, tp->tun_flags);
664 1.46 atatat simple_unlock(&tp->tun_lock);
665 1.8 deraadt return EHOSTDOWN;
666 1.8 deraadt }
667 1.8 deraadt
668 1.6 deraadt tp->tun_flags &= ~TUN_RWAIT;
669 1.6 deraadt
670 1.43 thorpej s = splnet();
671 1.6 deraadt do {
672 1.50 itojun IFQ_DEQUEUE(&ifp->if_snd, m0);
673 1.6 deraadt if (m0 == 0) {
674 1.6 deraadt if (tp->tun_flags & TUN_NBIO) {
675 1.6 deraadt splx(s);
676 1.46 atatat simple_unlock(&tp->tun_lock);
677 1.26 pk return (EWOULDBLOCK);
678 1.6 deraadt }
679 1.6 deraadt tp->tun_flags |= TUN_RWAIT;
680 1.46 atatat simple_unlock(&tp->tun_lock);
681 1.26 pk if (tsleep((caddr_t)tp, PZERO|PCATCH, "tunread", 0)) {
682 1.26 pk splx(s);
683 1.26 pk return (EINTR);
684 1.46 atatat } else {
685 1.46 atatat /*
686 1.46 atatat * Maybe the interface was destroyed while
687 1.46 atatat * we were sleeping, so let's ensure that
688 1.46 atatat * we're looking at the same (valid) tun
689 1.46 atatat * interface before looping.
690 1.46 atatat */
691 1.46 atatat tp = tun_find_unit(dev);
692 1.46 atatat if (tp == NULL ||
693 1.46 atatat tp->tun_if.if_index != index) {
694 1.46 atatat splx(s);
695 1.46 atatat if (tp)
696 1.46 atatat simple_unlock(&tp->tun_lock);
697 1.46 atatat return (ENXIO);
698 1.46 atatat }
699 1.26 pk }
700 1.6 deraadt }
701 1.6 deraadt } while (m0 == 0);
702 1.6 deraadt splx(s);
703 1.6 deraadt
704 1.6 deraadt while (m0 && uio->uio_resid > 0 && error == 0) {
705 1.13 deraadt len = min(uio->uio_resid, m0->m_len);
706 1.45 itojun if (len != 0)
707 1.45 itojun error = uiomove(mtod(m0, caddr_t), len, uio);
708 1.6 deraadt MFREE(m0, m);
709 1.6 deraadt m0 = m;
710 1.6 deraadt }
711 1.6 deraadt
712 1.6 deraadt if (m0) {
713 1.6 deraadt TUNDEBUG("Dropping mbuf\n");
714 1.6 deraadt m_freem(m0);
715 1.6 deraadt }
716 1.19 pk if (error)
717 1.19 pk ifp->if_ierrors++;
718 1.46 atatat simple_unlock(&tp->tun_lock);
719 1.26 pk return (error);
720 1.1 cgd }
721 1.1 cgd
722 1.1 cgd /*
723 1.1 cgd * the cdevsw write interface - an atomic write is a packet - or else!
724 1.1 cgd */
725 1.6 deraadt int
726 1.22 christos tunwrite(dev, uio, ioflag)
727 1.8 deraadt dev_t dev;
728 1.6 deraadt struct uio *uio;
729 1.22 christos int ioflag;
730 1.6 deraadt {
731 1.46 atatat struct tun_softc *tp;
732 1.46 atatat struct ifnet *ifp;
733 1.6 deraadt struct mbuf *top, **mp, *m;
734 1.26 pk struct ifqueue *ifq;
735 1.26 pk struct sockaddr dst;
736 1.26 pk int isr, error=0, s, tlen, mlen;
737 1.6 deraadt
738 1.46 atatat tp = tun_find_unit(dev);
739 1.46 atatat
740 1.46 atatat /* interface was "destroyed" already */
741 1.46 atatat if (tp == NULL)
742 1.46 atatat return (ENXIO);
743 1.46 atatat
744 1.46 atatat ifp = &tp->tun_if;
745 1.46 atatat
746 1.24 thorpej TUNDEBUG("%s: tunwrite\n", ifp->if_xname);
747 1.6 deraadt
748 1.26 pk if (tp->tun_flags & TUN_PREPADDR) {
749 1.46 atatat if (uio->uio_resid < sizeof(dst)) {
750 1.46 atatat simple_unlock(&tp->tun_lock);
751 1.26 pk return (EIO);
752 1.46 atatat }
753 1.26 pk error = uiomove((caddr_t)&dst, sizeof(dst), uio);
754 1.26 pk if (dst.sa_len > sizeof(dst)) {
755 1.26 pk /* Duh.. */
756 1.26 pk char discard;
757 1.26 pk int n = dst.sa_len - sizeof(dst);
758 1.26 pk while (n--)
759 1.46 atatat if ((error = uiomove(&discard, 1, uio)) != 0) {
760 1.46 atatat simple_unlock(&tp->tun_lock);
761 1.26 pk return (error);
762 1.46 atatat }
763 1.26 pk }
764 1.26 pk } else {
765 1.26 pk #ifdef INET
766 1.26 pk dst.sa_family = AF_INET;
767 1.26 pk #endif
768 1.26 pk }
769 1.26 pk
770 1.54 simonb if (uio->uio_resid > TUNMTU) {
771 1.37 mjacob TUNDEBUG("%s: len=%lu!\n", ifp->if_xname,
772 1.37 mjacob (unsigned long)uio->uio_resid);
773 1.46 atatat simple_unlock(&tp->tun_lock);
774 1.26 pk return (EIO);
775 1.6 deraadt }
776 1.26 pk
777 1.26 pk switch (dst.sa_family) {
778 1.26 pk #ifdef INET
779 1.26 pk case AF_INET:
780 1.26 pk ifq = &ipintrq;
781 1.26 pk isr = NETISR_IP;
782 1.26 pk break;
783 1.26 pk #endif
784 1.26 pk default:
785 1.46 atatat simple_unlock(&tp->tun_lock);
786 1.26 pk return (EAFNOSUPPORT);
787 1.26 pk }
788 1.26 pk
789 1.8 deraadt tlen = uio->uio_resid;
790 1.8 deraadt
791 1.8 deraadt /* get a header mbuf */
792 1.8 deraadt MGETHDR(m, M_DONTWAIT, MT_DATA);
793 1.46 atatat if (m == NULL) {
794 1.46 atatat simple_unlock(&tp->tun_lock);
795 1.26 pk return (ENOBUFS);
796 1.46 atatat }
797 1.8 deraadt mlen = MHLEN;
798 1.8 deraadt
799 1.6 deraadt top = 0;
800 1.6 deraadt mp = ⊤
801 1.6 deraadt while (error == 0 && uio->uio_resid > 0) {
802 1.13 deraadt m->m_len = min(mlen, uio->uio_resid);
803 1.8 deraadt error = uiomove(mtod (m, caddr_t), m->m_len, uio);
804 1.6 deraadt *mp = m;
805 1.6 deraadt mp = &m->m_next;
806 1.8 deraadt if (uio->uio_resid > 0) {
807 1.8 deraadt MGET (m, M_DONTWAIT, MT_DATA);
808 1.8 deraadt if (m == 0) {
809 1.8 deraadt error = ENOBUFS;
810 1.8 deraadt break;
811 1.8 deraadt }
812 1.8 deraadt mlen = MLEN;
813 1.8 deraadt }
814 1.6 deraadt }
815 1.6 deraadt if (error) {
816 1.6 deraadt if (top)
817 1.8 deraadt m_freem (top);
818 1.19 pk ifp->if_ierrors++;
819 1.46 atatat simple_unlock(&tp->tun_lock);
820 1.26 pk return (error);
821 1.6 deraadt }
822 1.6 deraadt
823 1.8 deraadt top->m_pkthdr.len = tlen;
824 1.8 deraadt top->m_pkthdr.rcvif = ifp;
825 1.8 deraadt
826 1.8 deraadt #if NBPFILTER > 0
827 1.40 thorpej if (ifp->if_bpf) {
828 1.8 deraadt /*
829 1.8 deraadt * We need to prepend the address family as
830 1.8 deraadt * a four byte field. Cons up a dummy header
831 1.8 deraadt * to pacify bpf. This is safe because bpf
832 1.8 deraadt * will only read from the mbuf (i.e., it won't
833 1.8 deraadt * try to free it or keep a pointer to it).
834 1.8 deraadt */
835 1.8 deraadt struct mbuf m;
836 1.16 cgd u_int32_t af = AF_INET;
837 1.8 deraadt
838 1.60 itojun m.m_flags = 0;
839 1.8 deraadt m.m_next = top;
840 1.16 cgd m.m_len = sizeof(af);
841 1.8 deraadt m.m_data = (char *)⁡
842 1.8 deraadt
843 1.40 thorpej bpf_mtap(ifp->if_bpf, &m);
844 1.6 deraadt }
845 1.8 deraadt #endif
846 1.6 deraadt
847 1.43 thorpej s = splnet();
848 1.26 pk if (IF_QFULL(ifq)) {
849 1.26 pk IF_DROP(ifq);
850 1.6 deraadt splx(s);
851 1.6 deraadt ifp->if_collisions++;
852 1.6 deraadt m_freem(top);
853 1.46 atatat simple_unlock(&tp->tun_lock);
854 1.26 pk return (ENOBUFS);
855 1.6 deraadt }
856 1.26 pk IF_ENQUEUE(ifq, top);
857 1.6 deraadt splx(s);
858 1.6 deraadt ifp->if_ipackets++;
859 1.58 jdolecek ifp->if_ibytes += tlen;
860 1.26 pk schednetisr(isr);
861 1.46 atatat simple_unlock(&tp->tun_lock);
862 1.26 pk return (error);
863 1.1 cgd }
864 1.1 cgd
865 1.50 itojun #ifdef ALTQ
866 1.50 itojun /*
867 1.50 itojun * Start packet transmission on the interface.
868 1.50 itojun * when the interface queue is rate-limited by ALTQ or TBR,
869 1.50 itojun * if_start is needed to drain packets from the queue in order
870 1.50 itojun * to notify readers when outgoing packets become ready.
871 1.50 itojun */
872 1.50 itojun static void
873 1.50 itojun tunstart(ifp)
874 1.50 itojun struct ifnet *ifp;
875 1.50 itojun {
876 1.50 itojun struct tun_softc *tp = ifp->if_softc;
877 1.50 itojun struct mbuf *m;
878 1.50 itojun struct proc *p;
879 1.50 itojun
880 1.50 itojun if (!ALTQ_IS_ENABLED(&ifp->if_snd) && !TBR_IS_ENABLED(&ifp->if_snd))
881 1.50 itojun return;
882 1.50 itojun
883 1.50 itojun IFQ_POLL(&ifp->if_snd, m);
884 1.50 itojun if (m != NULL) {
885 1.50 itojun if (tp->tun_flags & TUN_RWAIT) {
886 1.50 itojun tp->tun_flags &= ~TUN_RWAIT;
887 1.50 itojun wakeup((caddr_t)tp);
888 1.50 itojun }
889 1.50 itojun if (tp->tun_flags & TUN_ASYNC && tp->tun_pgrp) {
890 1.50 itojun if (tp->tun_pgrp > 0)
891 1.50 itojun gsignal(tp->tun_pgrp, SIGIO);
892 1.50 itojun else if ((p = pfind(-tp->tun_pgrp)) != NULL)
893 1.50 itojun psignal(p, SIGIO);
894 1.50 itojun }
895 1.50 itojun selwakeup(&tp->tun_rsel);
896 1.50 itojun }
897 1.50 itojun }
898 1.50 itojun #endif /* ALTQ */
899 1.1 cgd /*
900 1.27 mycroft * tunpoll - the poll interface, this is only useful on reads
901 1.6 deraadt * really. The write detect always returns true, write never blocks
902 1.6 deraadt * anyway, it either accepts the packet or drops it.
903 1.6 deraadt */
904 1.6 deraadt int
905 1.63 fvdl tunpoll(dev, events, p)
906 1.6 deraadt dev_t dev;
907 1.27 mycroft int events;
908 1.63 fvdl struct proc *p;
909 1.6 deraadt {
910 1.46 atatat struct tun_softc *tp;
911 1.46 atatat struct ifnet *ifp;
912 1.46 atatat int s, revents = 0;
913 1.46 atatat
914 1.46 atatat tp = tun_find_unit(dev);
915 1.46 atatat
916 1.46 atatat /* interface was "destroyed" already */
917 1.46 atatat if (tp == NULL)
918 1.46 atatat return (0);
919 1.46 atatat
920 1.46 atatat ifp = &tp->tun_if;
921 1.6 deraadt
922 1.43 thorpej s = splnet();
923 1.27 mycroft TUNDEBUG("%s: tunpoll\n", ifp->if_xname);
924 1.6 deraadt
925 1.35 veego if (events & (POLLIN | POLLRDNORM)) {
926 1.50 itojun if (IFQ_IS_EMPTY(&ifp->if_snd) == 0) {
927 1.27 mycroft TUNDEBUG("%s: tunpoll q=%d\n", ifp->if_xname,
928 1.24 thorpej ifp->if_snd.ifq_len);
929 1.27 mycroft revents |= events & (POLLIN | POLLRDNORM);
930 1.27 mycroft } else {
931 1.27 mycroft TUNDEBUG("%s: tunpoll waiting\n", ifp->if_xname);
932 1.63 fvdl selrecord(p, &tp->tun_rsel);
933 1.6 deraadt }
934 1.35 veego }
935 1.27 mycroft
936 1.27 mycroft if (events & (POLLOUT | POLLWRNORM))
937 1.27 mycroft revents |= events & (POLLOUT | POLLWRNORM);
938 1.27 mycroft
939 1.6 deraadt splx(s);
940 1.46 atatat simple_unlock(&tp->tun_lock);
941 1.27 mycroft return (revents);
942 1.56 jdolecek }
943 1.56 jdolecek
944 1.56 jdolecek static void
945 1.56 jdolecek filt_tunrdetach(struct knote *kn)
946 1.56 jdolecek {
947 1.56 jdolecek struct tun_softc *tp = kn->kn_hook;
948 1.56 jdolecek int s;
949 1.56 jdolecek
950 1.56 jdolecek s = splnet();
951 1.57 christos SLIST_REMOVE(&tp->tun_rsel.sel_klist, kn, knote, kn_selnext);
952 1.56 jdolecek splx(s);
953 1.56 jdolecek }
954 1.56 jdolecek
955 1.56 jdolecek static int
956 1.56 jdolecek filt_tunread(struct knote *kn, long hint)
957 1.56 jdolecek {
958 1.56 jdolecek struct tun_softc *tp = kn->kn_hook;
959 1.56 jdolecek struct ifnet *ifp = &tp->tun_if;
960 1.56 jdolecek struct mbuf *m;
961 1.56 jdolecek int s;
962 1.56 jdolecek
963 1.56 jdolecek s = splnet();
964 1.56 jdolecek IF_POLL(&ifp->if_snd, m);
965 1.56 jdolecek if (m == NULL) {
966 1.56 jdolecek splx(s);
967 1.56 jdolecek return (0);
968 1.56 jdolecek }
969 1.56 jdolecek
970 1.56 jdolecek for (kn->kn_data = 0; m != NULL; m = m->m_next)
971 1.56 jdolecek kn->kn_data += m->m_len;
972 1.56 jdolecek
973 1.56 jdolecek splx(s);
974 1.56 jdolecek return (1);
975 1.56 jdolecek }
976 1.56 jdolecek
977 1.56 jdolecek static const struct filterops tunread_filtops =
978 1.56 jdolecek { 1, NULL, filt_tunrdetach, filt_tunread };
979 1.56 jdolecek
980 1.56 jdolecek static const struct filterops tun_seltrue_filtops =
981 1.56 jdolecek { 1, NULL, filt_tunrdetach, filt_seltrue };
982 1.56 jdolecek
983 1.56 jdolecek int
984 1.56 jdolecek tunkqfilter(dev_t dev, struct knote *kn)
985 1.56 jdolecek {
986 1.56 jdolecek struct tun_softc *tp = tun_find_unit(dev);
987 1.56 jdolecek struct klist *klist;
988 1.56 jdolecek int s;
989 1.56 jdolecek
990 1.56 jdolecek switch (kn->kn_filter) {
991 1.56 jdolecek case EVFILT_READ:
992 1.57 christos klist = &tp->tun_rsel.sel_klist;
993 1.56 jdolecek kn->kn_fop = &tunread_filtops;
994 1.56 jdolecek break;
995 1.56 jdolecek
996 1.56 jdolecek case EVFILT_WRITE:
997 1.57 christos klist = &tp->tun_rsel.sel_klist;
998 1.56 jdolecek kn->kn_fop = &tun_seltrue_filtops;
999 1.56 jdolecek break;
1000 1.56 jdolecek
1001 1.56 jdolecek default:
1002 1.56 jdolecek return (1);
1003 1.56 jdolecek }
1004 1.56 jdolecek
1005 1.56 jdolecek kn->kn_hook = tp;
1006 1.56 jdolecek
1007 1.56 jdolecek s = splnet();
1008 1.56 jdolecek SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1009 1.56 jdolecek splx(s);
1010 1.56 jdolecek
1011 1.56 jdolecek return (0);
1012 1.1 cgd }
1013