1/* $NetBSD: if_tun.c,v 1.14 1994/06/29 06:36:25 cgd 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 it's
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 "tun.h"
18#if NTUN > 0
19
20#include "opt_devfs.h"
21#include "opt_inet.h"
22
23#include <sys/param.h>
24#include <sys/proc.h>
25#include <sys/systm.h>
26#include <sys/mbuf.h>
27#include <sys/socket.h>
28#include <sys/filio.h>
29#include <sys/sockio.h>
30#include <sys/ttycom.h>
31#include <sys/poll.h>
32#include <sys/signalvar.h>
33#include <sys/filedesc.h>
34#include <sys/kernel.h>
35#include <sys/sysctl.h>
36#ifdef DEVFS
37#include <sys/devfsext.h>
38#endif /*DEVFS*/
39#include <sys/conf.h>
40#include <sys/uio.h>
41#include <sys/vnode.h>
42
43#include <net/if.h>
44#include <net/netisr.h>
45#include <net/route.h>
46
47#ifdef INET
48#include <netinet/in.h>
49#include <netinet/in_var.h>
50#endif
51
52#ifdef NS
53#include <netns/ns.h>
54#include <netns/ns_if.h>
55#endif
56
57#include "bpfilter.h"
58#if NBPFILTER > 0
59#include <net/bpf.h>
60#endif
61
62#include <net/if_tunvar.h>
63#include <net/if_tun.h>
64
65static void tunattach __P((void *));
66PSEUDO_SET(tunattach, if_tun);
67
68#define TUNDEBUG if (tundebug) printf
69static int tundebug = 0;
70SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, "");
71
72static struct tun_softc tunctl[NTUN];
73
74static int tunoutput __P((struct ifnet *, struct mbuf *, struct sockaddr *,
75 struct rtentry *rt));
76static int tunifioctl __P((struct ifnet *, u_long, caddr_t));
77static int tuninit __P((int));
78
79static d_open_t tunopen;
80static d_close_t tunclose;
81static d_read_t tunread;
82static d_write_t tunwrite;
83static d_ioctl_t tunioctl;
84static d_poll_t tunpoll;
85
86#define CDEV_MAJOR 52
87static struct cdevsw tun_cdevsw = {
88 tunopen, tunclose, tunread, tunwrite,
89 tunioctl, nullstop, noreset, nodevtotty,
90 tunpoll, nommap, nostrategy, "tun", NULL, -1
91};
92
93
94static int tun_devsw_installed;
95#ifdef DEVFS
96static void *tun_devfs_token[NTUN];
97#endif
98
99#define minor_val(n) ((((n) & ~0xff) << 8) | ((n) & 0xff))
100#define dev_val(n) (((n) >> 8) | ((n) & 0xff))
101
102static void
103tunattach(dummy)
104 void *dummy;
105{
106 register int i;
107 struct ifnet *ifp;
108 dev_t dev;
109
110 if ( tun_devsw_installed )
111 return;
112 dev = makedev(CDEV_MAJOR, 0);
113 cdevsw_add(&dev, &tun_cdevsw, NULL);
114 tun_devsw_installed = 1;
115 for ( i = 0; i < NTUN; i++ ) {
116#ifdef DEVFS
117 tun_devfs_token[i] = devfs_add_devswf(&tun_cdevsw, minor_val(i),
118 DV_CHR, UID_UUCP,
119 GID_DIALER, 0600,
120 "tun%d", i);
121#endif
122 tunctl[i].tun_flags = TUN_INITED;
123
124 ifp = &tunctl[i].tun_if;
125 ifp->if_unit = i;
126 ifp->if_name = "tun";
127 ifp->if_mtu = TUNMTU;
128 ifp->if_ioctl = tunifioctl;
129 ifp->if_output = tunoutput;
130 ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
131 ifp->if_snd.ifq_maxlen = ifqmaxlen;
132 if_attach(ifp);
133#if NBPFILTER > 0
134 bpfattach(ifp, DLT_NULL, sizeof(u_int));
135#endif
136 }
137}
138
139/*
140 * tunnel open - must be superuser & the device must be
141 * configured in
142 */
143static int
144tunopen(dev, flag, mode, p)
145 dev_t dev;
146 int flag, mode;
147 struct proc *p;
148{
149 struct ifnet *ifp;
150 struct tun_softc *tp;
151 register int unit, error;
152
153 error = suser(p->p_ucred, &p->p_acflag);
154 if (error)
155 return (error);
156
157 if ((unit = dev_val(minor(dev))) >= NTUN)
158 return (ENXIO);
159 tp = &tunctl[unit];
160 if (tp->tun_flags & TUN_OPEN)
161 return EBUSY;
162 ifp = &tp->tun_if;
163 tp->tun_flags |= TUN_OPEN;
164 TUNDEBUG("%s%d: open\n", ifp->if_name, ifp->if_unit);
165 return (0);
166}
167
168/*
169 * tunclose - close the device - mark i/f down & delete
170 * routing info
171 */
172static int
173tunclose(dev, foo, bar, p)
174 dev_t dev;
175 int foo;
176 int bar;
177 struct proc *p;
178{
179 register int unit = dev_val(minor(dev)), s;
180 struct tun_softc *tp = &tunctl[unit];
181 struct ifnet *ifp = &tp->tun_if;
182 struct mbuf *m;
183
184 tp->tun_flags &= ~TUN_OPEN;
185
186 /*
187 * junk all pending output
188 */
189 do {
190 s = splimp();
191 IF_DEQUEUE(&ifp->if_snd, m);
192 splx(s);
193 if (m)
194 m_freem(m);
195 } while (m);
196
197 if (ifp->if_flags & IFF_UP) {
198 s = splimp();
199 if_down(ifp);
200 if (ifp->if_flags & IFF_RUNNING) {
201 /* find internet addresses and delete routes */
202 register struct ifaddr *ifa;
203 for (ifa = ifp->if_addrhead.tqh_first; ifa;
204 ifa = ifa->ifa_link.tqe_next) {
205 if (ifa->ifa_addr->sa_family == AF_INET) {
206 rtinit(ifa, (int)RTM_DELETE,
207 tp->tun_flags & TUN_DSTADDR ? RTF_HOST : 0);
208 }
209 }
210 }
211 splx(s);
212 }
213 funsetown(tp->tun_sigio);
214 selwakeup(&tp->tun_rsel);
215
216 TUNDEBUG ("%s%d: closed\n", ifp->if_name, ifp->if_unit);
217 return (0);
218}
219
220static int
221tuninit(unit)
222 int unit;
223{
224 struct tun_softc *tp = &tunctl[unit];
225 struct ifnet *ifp = &tp->tun_if;
226 register struct ifaddr *ifa;
227
228 TUNDEBUG("%s%d: tuninit\n", ifp->if_name, ifp->if_unit);
229
230 ifp->if_flags |= IFF_UP | IFF_RUNNING;
231 getmicrotime(&ifp->if_lastchange);
232
233 for (ifa = ifp->if_addrhead.tqh_first; ifa;
234 ifa = ifa->ifa_link.tqe_next) {
235#ifdef INET
236 if (ifa->ifa_addr->sa_family == AF_INET) {
237 struct sockaddr_in *si;
238
239 si = (struct sockaddr_in *)ifa->ifa_addr;
240 if (si && si->sin_addr.s_addr)
241 tp->tun_flags |= TUN_IASET;
242
243 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
244 if (si && si->sin_addr.s_addr)
245 tp->tun_flags |= TUN_DSTADDR;
246 }
247#endif
248 }
249 return 0;
250}
251
252/*
253 * Process an ioctl request.
254 */
255int
256tunifioctl(ifp, cmd, data)
257 struct ifnet *ifp;
258 u_long cmd;
259 caddr_t data;
260{
261 register struct ifreq *ifr = (struct ifreq *)data;
262 int error = 0, s;
263
264 s = splimp();
265 switch(cmd) {
266 case SIOCSIFADDR:
267 tuninit(ifp->if_unit);
268 TUNDEBUG("%s%d: address set\n",
269 ifp->if_name, ifp->if_unit);
270 break;
271 case SIOCSIFDSTADDR:
272 tuninit(ifp->if_unit);
273 TUNDEBUG("%s%d: destination address set\n",
274 ifp->if_name, ifp->if_unit);
275 break;
276 case SIOCSIFMTU:
277 ifp->if_mtu = ifr->ifr_mtu;
278 TUNDEBUG("%s%d: mtu set\n",
279 ifp->if_name, ifp->if_unit);
280 break;
281 case SIOCADDMULTI:
282 case SIOCDELMULTI:
283 break;
284
285
286 default:
287 error = EINVAL;
288 }
289 splx(s);
290 return (error);
291}
292
293/*
294 * tunoutput - queue packets from higher level ready to put out.
295 */
296int
297tunoutput(ifp, m0, dst, rt)
298 struct ifnet *ifp;
299 struct mbuf *m0;
300 struct sockaddr *dst;
301 struct rtentry *rt;
302{
303 struct tun_softc *tp = &tunctl[ifp->if_unit];
304 int s;
305
306 TUNDEBUG ("%s%d: tunoutput\n", ifp->if_name, ifp->if_unit);
307
308 if ((tp->tun_flags & TUN_READY) != TUN_READY) {
309 TUNDEBUG ("%s%d: not ready 0%o\n", ifp->if_name,
310 ifp->if_unit, tp->tun_flags);
311 m_freem (m0);
312 return EHOSTDOWN;
313 }
314
315#if NBPFILTER > 0
316 /* BPF write needs to be handled specially */
317 if (dst->sa_family == AF_UNSPEC) {
318 dst->sa_family = *(mtod(m0, int *));
319 m0->m_len -= sizeof(int);
320 m0->m_pkthdr.len -= sizeof(int);
321 m0->m_data += sizeof(int);
322 }
323
324 if (ifp->if_bpf) {
325 /*
326 * We need to prepend the address family as
327 * a four byte field. Cons up a dummy header
328 * to pacify bpf. This is safe because bpf
329 * will only read from the mbuf (i.e., it won't
330 * try to free it or keep a pointer to it).
331 */
332 struct mbuf m;
333 u_int af = dst->sa_family;
334
335 m.m_next = m0;
336 m.m_len = 4;
337 m.m_data = (char *)⁡
338
339 bpf_mtap(ifp, &m);
340 }
341#endif
342
343 switch(dst->sa_family) {
344#ifdef INET
345 case AF_INET:
346 s = splimp();
347 if (IF_QFULL(&ifp->if_snd)) {
348 IF_DROP(&ifp->if_snd);
349 m_freem(m0);
350 splx(s);
351 ifp->if_collisions++;
352 return (ENOBUFS);
353 }
354 ifp->if_obytes += m0->m_pkthdr.len;
355 IF_ENQUEUE(&ifp->if_snd, m0);
356 splx(s);
357 ifp->if_opackets++;
358 break;
359#endif
360 default:
361 m_freem(m0);
362 return EAFNOSUPPORT;
363 }
364
365 if (tp->tun_flags & TUN_RWAIT) {
366 tp->tun_flags &= ~TUN_RWAIT;
367 wakeup((caddr_t)tp);
368 }
369 if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio)
370 pgsigio(tp->tun_sigio, SIGIO, 0);
371 selwakeup(&tp->tun_rsel);
372 return 0;
373}
374
375/*
376 * the cdevsw interface is now pretty minimal.
377 */
378static int
379tunioctl(dev, cmd, data, flag, p)
380 dev_t dev;
381 u_long cmd;
382 caddr_t data;
383 int flag;
384 struct proc *p;
385{
386 int unit = dev_val(minor(dev)), s;
387 struct tun_softc *tp = &tunctl[unit];
388 struct tuninfo *tunp;
389
390 switch (cmd) {
391 case TUNSIFINFO:
392 tunp = (struct tuninfo *)data;
393 tp->tun_if.if_mtu = tunp->mtu;
394 tp->tun_if.if_type = tunp->type;
395 tp->tun_if.if_baudrate = tunp->baudrate;
396 break;
397 case TUNGIFINFO:
398 tunp = (struct tuninfo *)data;
399 tunp->mtu = tp->tun_if.if_mtu;
400 tunp->type = tp->tun_if.if_type;
401 tunp->baudrate = tp->tun_if.if_baudrate;
402 break;
403 case TUNSDEBUG:
404 tundebug = *(int *)data;
405 break;
406 case TUNGDEBUG:
407 *(int *)data = tundebug;
408 break;
409 case FIONBIO:
410 break;
411 case FIOASYNC:
412 if (*(int *)data)
413 tp->tun_flags |= TUN_ASYNC;
414 else
415 tp->tun_flags &= ~TUN_ASYNC;
416 break;
417 case FIONREAD:
418 s = splimp();
419 if (tp->tun_if.if_snd.ifq_head) {
420 struct mbuf *mb = tp->tun_if.if_snd.ifq_head;
421 for( *(int *)data = 0; mb != 0; mb = mb->m_next)
422 *(int *)data += mb->m_len;
423 } else
424 *(int *)data = 0;
425 splx(s);
426 break;
427 case FIOSETOWN:
428 return (fsetown(*(int *)data, &tp->tun_sigio));
429
430 case FIOGETOWN:
431 *(int *)data = fgetown(tp->tun_sigio);
432 return (0);
433
434 /* This is deprecated, FIOSETOWN should be used instead. */
435 case TIOCSPGRP:
436 return (fsetown(-(*(int *)data), &tp->tun_sigio));
437
438 /* This is deprecated, FIOGETOWN should be used instead. */
439 case TIOCGPGRP:
440 *(int *)data = -fgetown(tp->tun_sigio);
441 return (0);
442
443 default:
444 return (ENOTTY);
445 }
446 return (0);
447}
448
449/*
450 * The cdevsw read interface - reads a packet at a time, or at
451 * least as much of a packet as can be read.
452 */
453static int
454tunread(dev, uio, flag)
455 dev_t dev;
456 struct uio *uio;
457 int flag;
458{
459 int unit = dev_val(minor(dev));
460 struct tun_softc *tp = &tunctl[unit];
461 struct ifnet *ifp = &tp->tun_if;
462 struct mbuf *m, *m0;
463 int error=0, len, s;
464
465 TUNDEBUG ("%s%d: read\n", ifp->if_name, ifp->if_unit);
466 if ((tp->tun_flags & TUN_READY) != TUN_READY) {
467 TUNDEBUG ("%s%d: not ready 0%o\n", ifp->if_name,
468 ifp->if_unit, tp->tun_flags);
469 return EHOSTDOWN;
470 }
471
472 tp->tun_flags &= ~TUN_RWAIT;
473
474 s = splimp();
475 do {
476 IF_DEQUEUE(&ifp->if_snd, m0);
477 if (m0 == 0) {
478 if (flag & IO_NDELAY) {
479 splx(s);
480 return EWOULDBLOCK;
481 }
482 tp->tun_flags |= TUN_RWAIT;
| 1/* $NetBSD: if_tun.c,v 1.14 1994/06/29 06:36:25 cgd 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 it's
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 "tun.h"
18#if NTUN > 0
19
20#include "opt_devfs.h"
21#include "opt_inet.h"
22
23#include <sys/param.h>
24#include <sys/proc.h>
25#include <sys/systm.h>
26#include <sys/mbuf.h>
27#include <sys/socket.h>
28#include <sys/filio.h>
29#include <sys/sockio.h>
30#include <sys/ttycom.h>
31#include <sys/poll.h>
32#include <sys/signalvar.h>
33#include <sys/filedesc.h>
34#include <sys/kernel.h>
35#include <sys/sysctl.h>
36#ifdef DEVFS
37#include <sys/devfsext.h>
38#endif /*DEVFS*/
39#include <sys/conf.h>
40#include <sys/uio.h>
41#include <sys/vnode.h>
42
43#include <net/if.h>
44#include <net/netisr.h>
45#include <net/route.h>
46
47#ifdef INET
48#include <netinet/in.h>
49#include <netinet/in_var.h>
50#endif
51
52#ifdef NS
53#include <netns/ns.h>
54#include <netns/ns_if.h>
55#endif
56
57#include "bpfilter.h"
58#if NBPFILTER > 0
59#include <net/bpf.h>
60#endif
61
62#include <net/if_tunvar.h>
63#include <net/if_tun.h>
64
65static void tunattach __P((void *));
66PSEUDO_SET(tunattach, if_tun);
67
68#define TUNDEBUG if (tundebug) printf
69static int tundebug = 0;
70SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, "");
71
72static struct tun_softc tunctl[NTUN];
73
74static int tunoutput __P((struct ifnet *, struct mbuf *, struct sockaddr *,
75 struct rtentry *rt));
76static int tunifioctl __P((struct ifnet *, u_long, caddr_t));
77static int tuninit __P((int));
78
79static d_open_t tunopen;
80static d_close_t tunclose;
81static d_read_t tunread;
82static d_write_t tunwrite;
83static d_ioctl_t tunioctl;
84static d_poll_t tunpoll;
85
86#define CDEV_MAJOR 52
87static struct cdevsw tun_cdevsw = {
88 tunopen, tunclose, tunread, tunwrite,
89 tunioctl, nullstop, noreset, nodevtotty,
90 tunpoll, nommap, nostrategy, "tun", NULL, -1
91};
92
93
94static int tun_devsw_installed;
95#ifdef DEVFS
96static void *tun_devfs_token[NTUN];
97#endif
98
99#define minor_val(n) ((((n) & ~0xff) << 8) | ((n) & 0xff))
100#define dev_val(n) (((n) >> 8) | ((n) & 0xff))
101
102static void
103tunattach(dummy)
104 void *dummy;
105{
106 register int i;
107 struct ifnet *ifp;
108 dev_t dev;
109
110 if ( tun_devsw_installed )
111 return;
112 dev = makedev(CDEV_MAJOR, 0);
113 cdevsw_add(&dev, &tun_cdevsw, NULL);
114 tun_devsw_installed = 1;
115 for ( i = 0; i < NTUN; i++ ) {
116#ifdef DEVFS
117 tun_devfs_token[i] = devfs_add_devswf(&tun_cdevsw, minor_val(i),
118 DV_CHR, UID_UUCP,
119 GID_DIALER, 0600,
120 "tun%d", i);
121#endif
122 tunctl[i].tun_flags = TUN_INITED;
123
124 ifp = &tunctl[i].tun_if;
125 ifp->if_unit = i;
126 ifp->if_name = "tun";
127 ifp->if_mtu = TUNMTU;
128 ifp->if_ioctl = tunifioctl;
129 ifp->if_output = tunoutput;
130 ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
131 ifp->if_snd.ifq_maxlen = ifqmaxlen;
132 if_attach(ifp);
133#if NBPFILTER > 0
134 bpfattach(ifp, DLT_NULL, sizeof(u_int));
135#endif
136 }
137}
138
139/*
140 * tunnel open - must be superuser & the device must be
141 * configured in
142 */
143static int
144tunopen(dev, flag, mode, p)
145 dev_t dev;
146 int flag, mode;
147 struct proc *p;
148{
149 struct ifnet *ifp;
150 struct tun_softc *tp;
151 register int unit, error;
152
153 error = suser(p->p_ucred, &p->p_acflag);
154 if (error)
155 return (error);
156
157 if ((unit = dev_val(minor(dev))) >= NTUN)
158 return (ENXIO);
159 tp = &tunctl[unit];
160 if (tp->tun_flags & TUN_OPEN)
161 return EBUSY;
162 ifp = &tp->tun_if;
163 tp->tun_flags |= TUN_OPEN;
164 TUNDEBUG("%s%d: open\n", ifp->if_name, ifp->if_unit);
165 return (0);
166}
167
168/*
169 * tunclose - close the device - mark i/f down & delete
170 * routing info
171 */
172static int
173tunclose(dev, foo, bar, p)
174 dev_t dev;
175 int foo;
176 int bar;
177 struct proc *p;
178{
179 register int unit = dev_val(minor(dev)), s;
180 struct tun_softc *tp = &tunctl[unit];
181 struct ifnet *ifp = &tp->tun_if;
182 struct mbuf *m;
183
184 tp->tun_flags &= ~TUN_OPEN;
185
186 /*
187 * junk all pending output
188 */
189 do {
190 s = splimp();
191 IF_DEQUEUE(&ifp->if_snd, m);
192 splx(s);
193 if (m)
194 m_freem(m);
195 } while (m);
196
197 if (ifp->if_flags & IFF_UP) {
198 s = splimp();
199 if_down(ifp);
200 if (ifp->if_flags & IFF_RUNNING) {
201 /* find internet addresses and delete routes */
202 register struct ifaddr *ifa;
203 for (ifa = ifp->if_addrhead.tqh_first; ifa;
204 ifa = ifa->ifa_link.tqe_next) {
205 if (ifa->ifa_addr->sa_family == AF_INET) {
206 rtinit(ifa, (int)RTM_DELETE,
207 tp->tun_flags & TUN_DSTADDR ? RTF_HOST : 0);
208 }
209 }
210 }
211 splx(s);
212 }
213 funsetown(tp->tun_sigio);
214 selwakeup(&tp->tun_rsel);
215
216 TUNDEBUG ("%s%d: closed\n", ifp->if_name, ifp->if_unit);
217 return (0);
218}
219
220static int
221tuninit(unit)
222 int unit;
223{
224 struct tun_softc *tp = &tunctl[unit];
225 struct ifnet *ifp = &tp->tun_if;
226 register struct ifaddr *ifa;
227
228 TUNDEBUG("%s%d: tuninit\n", ifp->if_name, ifp->if_unit);
229
230 ifp->if_flags |= IFF_UP | IFF_RUNNING;
231 getmicrotime(&ifp->if_lastchange);
232
233 for (ifa = ifp->if_addrhead.tqh_first; ifa;
234 ifa = ifa->ifa_link.tqe_next) {
235#ifdef INET
236 if (ifa->ifa_addr->sa_family == AF_INET) {
237 struct sockaddr_in *si;
238
239 si = (struct sockaddr_in *)ifa->ifa_addr;
240 if (si && si->sin_addr.s_addr)
241 tp->tun_flags |= TUN_IASET;
242
243 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
244 if (si && si->sin_addr.s_addr)
245 tp->tun_flags |= TUN_DSTADDR;
246 }
247#endif
248 }
249 return 0;
250}
251
252/*
253 * Process an ioctl request.
254 */
255int
256tunifioctl(ifp, cmd, data)
257 struct ifnet *ifp;
258 u_long cmd;
259 caddr_t data;
260{
261 register struct ifreq *ifr = (struct ifreq *)data;
262 int error = 0, s;
263
264 s = splimp();
265 switch(cmd) {
266 case SIOCSIFADDR:
267 tuninit(ifp->if_unit);
268 TUNDEBUG("%s%d: address set\n",
269 ifp->if_name, ifp->if_unit);
270 break;
271 case SIOCSIFDSTADDR:
272 tuninit(ifp->if_unit);
273 TUNDEBUG("%s%d: destination address set\n",
274 ifp->if_name, ifp->if_unit);
275 break;
276 case SIOCSIFMTU:
277 ifp->if_mtu = ifr->ifr_mtu;
278 TUNDEBUG("%s%d: mtu set\n",
279 ifp->if_name, ifp->if_unit);
280 break;
281 case SIOCADDMULTI:
282 case SIOCDELMULTI:
283 break;
284
285
286 default:
287 error = EINVAL;
288 }
289 splx(s);
290 return (error);
291}
292
293/*
294 * tunoutput - queue packets from higher level ready to put out.
295 */
296int
297tunoutput(ifp, m0, dst, rt)
298 struct ifnet *ifp;
299 struct mbuf *m0;
300 struct sockaddr *dst;
301 struct rtentry *rt;
302{
303 struct tun_softc *tp = &tunctl[ifp->if_unit];
304 int s;
305
306 TUNDEBUG ("%s%d: tunoutput\n", ifp->if_name, ifp->if_unit);
307
308 if ((tp->tun_flags & TUN_READY) != TUN_READY) {
309 TUNDEBUG ("%s%d: not ready 0%o\n", ifp->if_name,
310 ifp->if_unit, tp->tun_flags);
311 m_freem (m0);
312 return EHOSTDOWN;
313 }
314
315#if NBPFILTER > 0
316 /* BPF write needs to be handled specially */
317 if (dst->sa_family == AF_UNSPEC) {
318 dst->sa_family = *(mtod(m0, int *));
319 m0->m_len -= sizeof(int);
320 m0->m_pkthdr.len -= sizeof(int);
321 m0->m_data += sizeof(int);
322 }
323
324 if (ifp->if_bpf) {
325 /*
326 * We need to prepend the address family as
327 * a four byte field. Cons up a dummy header
328 * to pacify bpf. This is safe because bpf
329 * will only read from the mbuf (i.e., it won't
330 * try to free it or keep a pointer to it).
331 */
332 struct mbuf m;
333 u_int af = dst->sa_family;
334
335 m.m_next = m0;
336 m.m_len = 4;
337 m.m_data = (char *)⁡
338
339 bpf_mtap(ifp, &m);
340 }
341#endif
342
343 switch(dst->sa_family) {
344#ifdef INET
345 case AF_INET:
346 s = splimp();
347 if (IF_QFULL(&ifp->if_snd)) {
348 IF_DROP(&ifp->if_snd);
349 m_freem(m0);
350 splx(s);
351 ifp->if_collisions++;
352 return (ENOBUFS);
353 }
354 ifp->if_obytes += m0->m_pkthdr.len;
355 IF_ENQUEUE(&ifp->if_snd, m0);
356 splx(s);
357 ifp->if_opackets++;
358 break;
359#endif
360 default:
361 m_freem(m0);
362 return EAFNOSUPPORT;
363 }
364
365 if (tp->tun_flags & TUN_RWAIT) {
366 tp->tun_flags &= ~TUN_RWAIT;
367 wakeup((caddr_t)tp);
368 }
369 if (tp->tun_flags & TUN_ASYNC && tp->tun_sigio)
370 pgsigio(tp->tun_sigio, SIGIO, 0);
371 selwakeup(&tp->tun_rsel);
372 return 0;
373}
374
375/*
376 * the cdevsw interface is now pretty minimal.
377 */
378static int
379tunioctl(dev, cmd, data, flag, p)
380 dev_t dev;
381 u_long cmd;
382 caddr_t data;
383 int flag;
384 struct proc *p;
385{
386 int unit = dev_val(minor(dev)), s;
387 struct tun_softc *tp = &tunctl[unit];
388 struct tuninfo *tunp;
389
390 switch (cmd) {
391 case TUNSIFINFO:
392 tunp = (struct tuninfo *)data;
393 tp->tun_if.if_mtu = tunp->mtu;
394 tp->tun_if.if_type = tunp->type;
395 tp->tun_if.if_baudrate = tunp->baudrate;
396 break;
397 case TUNGIFINFO:
398 tunp = (struct tuninfo *)data;
399 tunp->mtu = tp->tun_if.if_mtu;
400 tunp->type = tp->tun_if.if_type;
401 tunp->baudrate = tp->tun_if.if_baudrate;
402 break;
403 case TUNSDEBUG:
404 tundebug = *(int *)data;
405 break;
406 case TUNGDEBUG:
407 *(int *)data = tundebug;
408 break;
409 case FIONBIO:
410 break;
411 case FIOASYNC:
412 if (*(int *)data)
413 tp->tun_flags |= TUN_ASYNC;
414 else
415 tp->tun_flags &= ~TUN_ASYNC;
416 break;
417 case FIONREAD:
418 s = splimp();
419 if (tp->tun_if.if_snd.ifq_head) {
420 struct mbuf *mb = tp->tun_if.if_snd.ifq_head;
421 for( *(int *)data = 0; mb != 0; mb = mb->m_next)
422 *(int *)data += mb->m_len;
423 } else
424 *(int *)data = 0;
425 splx(s);
426 break;
427 case FIOSETOWN:
428 return (fsetown(*(int *)data, &tp->tun_sigio));
429
430 case FIOGETOWN:
431 *(int *)data = fgetown(tp->tun_sigio);
432 return (0);
433
434 /* This is deprecated, FIOSETOWN should be used instead. */
435 case TIOCSPGRP:
436 return (fsetown(-(*(int *)data), &tp->tun_sigio));
437
438 /* This is deprecated, FIOGETOWN should be used instead. */
439 case TIOCGPGRP:
440 *(int *)data = -fgetown(tp->tun_sigio);
441 return (0);
442
443 default:
444 return (ENOTTY);
445 }
446 return (0);
447}
448
449/*
450 * The cdevsw read interface - reads a packet at a time, or at
451 * least as much of a packet as can be read.
452 */
453static int
454tunread(dev, uio, flag)
455 dev_t dev;
456 struct uio *uio;
457 int flag;
458{
459 int unit = dev_val(minor(dev));
460 struct tun_softc *tp = &tunctl[unit];
461 struct ifnet *ifp = &tp->tun_if;
462 struct mbuf *m, *m0;
463 int error=0, len, s;
464
465 TUNDEBUG ("%s%d: read\n", ifp->if_name, ifp->if_unit);
466 if ((tp->tun_flags & TUN_READY) != TUN_READY) {
467 TUNDEBUG ("%s%d: not ready 0%o\n", ifp->if_name,
468 ifp->if_unit, tp->tun_flags);
469 return EHOSTDOWN;
470 }
471
472 tp->tun_flags &= ~TUN_RWAIT;
473
474 s = splimp();
475 do {
476 IF_DEQUEUE(&ifp->if_snd, m0);
477 if (m0 == 0) {
478 if (flag & IO_NDELAY) {
479 splx(s);
480 return EWOULDBLOCK;
481 }
482 tp->tun_flags |= TUN_RWAIT;
|
485 splx(s);
486 return error;
487 }
488 }
489 } while (m0 == 0);
490 splx(s);
491
492 while (m0 && uio->uio_resid > 0 && error == 0) {
493 len = min(uio->uio_resid, m0->m_len);
494 if (len == 0)
495 break;
496 error = uiomove(mtod(m0, caddr_t), len, uio);
497 MFREE(m0, m);
498 m0 = m;
499 }
500
501 if (m0) {
502 TUNDEBUG("Dropping mbuf\n");
503 m_freem(m0);
504 }
505 return error;
506}
507
508/*
509 * the cdevsw write interface - an atomic write is a packet - or else!
510 */
511static int
512tunwrite(dev, uio, flag)
513 dev_t dev;
514 struct uio *uio;
515 int flag;
516{
517 int unit = dev_val(minor(dev));
518 struct ifnet *ifp = &tunctl[unit].tun_if;
519 struct mbuf *top, **mp, *m;
520 int error=0, s, tlen, mlen;
521
522 TUNDEBUG("%s%d: tunwrite\n", ifp->if_name, ifp->if_unit);
523
524 if (uio->uio_resid < 0 || uio->uio_resid > TUNMRU) {
525 TUNDEBUG("%s%d: len=%d!\n", ifp->if_name, ifp->if_unit,
526 uio->uio_resid);
527 return EIO;
528 }
529 tlen = uio->uio_resid;
530
531 /* get a header mbuf */
532 MGETHDR(m, M_DONTWAIT, MT_DATA);
533 if (m == NULL)
534 return ENOBUFS;
535 mlen = MHLEN;
536
537 top = 0;
538 mp = ⊤
539 while (error == 0 && uio->uio_resid > 0) {
540 m->m_len = min(mlen, uio->uio_resid);
541 error = uiomove(mtod (m, caddr_t), m->m_len, uio);
542 *mp = m;
543 mp = &m->m_next;
544 if (uio->uio_resid > 0) {
545 MGET (m, M_DONTWAIT, MT_DATA);
546 if (m == 0) {
547 error = ENOBUFS;
548 break;
549 }
550 mlen = MLEN;
551 }
552 }
553 if (error) {
554 if (top)
555 m_freem (top);
556 return error;
557 }
558
559 top->m_pkthdr.len = tlen;
560 top->m_pkthdr.rcvif = ifp;
561
562#if NBPFILTER > 0
563 if (ifp->if_bpf) {
564 /*
565 * We need to prepend the address family as
566 * a four byte field. Cons up a dummy header
567 * to pacify bpf. This is safe because bpf
568 * will only read from the mbuf (i.e., it won't
569 * try to free it or keep a pointer to it).
570 */
571 struct mbuf m;
572 u_int af = AF_INET;
573
574 m.m_next = top;
575 m.m_len = 4;
576 m.m_data = (char *)⁡
577
578 bpf_mtap(ifp, &m);
579 }
580#endif
581
582#ifdef INET
583 s = splimp();
584 if (IF_QFULL (&ipintrq)) {
585 IF_DROP(&ipintrq);
586 splx(s);
587 ifp->if_collisions++;
588 m_freem(top);
589 return ENOBUFS;
590 }
591 IF_ENQUEUE(&ipintrq, top);
592 splx(s);
593 ifp->if_ibytes += tlen;
594 ifp->if_ipackets++;
595 schednetisr(NETISR_IP);
596#endif
597 return error;
598}
599
600/*
601 * tunpoll - the poll interface, this is only useful on reads
602 * really. The write detect always returns true, write never blocks
603 * anyway, it either accepts the packet or drops it.
604 */
605static int
606tunpoll(dev, events, p)
607 dev_t dev;
608 int events;
609 struct proc *p;
610{
611 int unit = dev_val(minor(dev)), s;
612 struct tun_softc *tp = &tunctl[unit];
613 struct ifnet *ifp = &tp->tun_if;
614 int revents = 0;
615
616 s = splimp();
617 TUNDEBUG("%s%d: tunpoll\n", ifp->if_name, ifp->if_unit);
618
619 if (events & (POLLIN | POLLRDNORM))
620 if (ifp->if_snd.ifq_len > 0) {
621 TUNDEBUG("%s%d: tunpoll q=%d\n", ifp->if_name,
622 ifp->if_unit, ifp->if_snd.ifq_len);
623 revents |= events & (POLLIN | POLLRDNORM);
624 } else {
625 TUNDEBUG("%s%d: tunpoll waiting\n", ifp->if_name,
626 ifp->if_unit);
627 selrecord(p, &tp->tun_rsel);
628 }
629
630 if (events & (POLLOUT | POLLWRNORM))
631 revents |= events & (POLLOUT | POLLWRNORM);
632
633 splx(s);
634 return (revents);
635}
636
637
638#endif /* NTUN */
| 485 splx(s);
486 return error;
487 }
488 }
489 } while (m0 == 0);
490 splx(s);
491
492 while (m0 && uio->uio_resid > 0 && error == 0) {
493 len = min(uio->uio_resid, m0->m_len);
494 if (len == 0)
495 break;
496 error = uiomove(mtod(m0, caddr_t), len, uio);
497 MFREE(m0, m);
498 m0 = m;
499 }
500
501 if (m0) {
502 TUNDEBUG("Dropping mbuf\n");
503 m_freem(m0);
504 }
505 return error;
506}
507
508/*
509 * the cdevsw write interface - an atomic write is a packet - or else!
510 */
511static int
512tunwrite(dev, uio, flag)
513 dev_t dev;
514 struct uio *uio;
515 int flag;
516{
517 int unit = dev_val(minor(dev));
518 struct ifnet *ifp = &tunctl[unit].tun_if;
519 struct mbuf *top, **mp, *m;
520 int error=0, s, tlen, mlen;
521
522 TUNDEBUG("%s%d: tunwrite\n", ifp->if_name, ifp->if_unit);
523
524 if (uio->uio_resid < 0 || uio->uio_resid > TUNMRU) {
525 TUNDEBUG("%s%d: len=%d!\n", ifp->if_name, ifp->if_unit,
526 uio->uio_resid);
527 return EIO;
528 }
529 tlen = uio->uio_resid;
530
531 /* get a header mbuf */
532 MGETHDR(m, M_DONTWAIT, MT_DATA);
533 if (m == NULL)
534 return ENOBUFS;
535 mlen = MHLEN;
536
537 top = 0;
538 mp = ⊤
539 while (error == 0 && uio->uio_resid > 0) {
540 m->m_len = min(mlen, uio->uio_resid);
541 error = uiomove(mtod (m, caddr_t), m->m_len, uio);
542 *mp = m;
543 mp = &m->m_next;
544 if (uio->uio_resid > 0) {
545 MGET (m, M_DONTWAIT, MT_DATA);
546 if (m == 0) {
547 error = ENOBUFS;
548 break;
549 }
550 mlen = MLEN;
551 }
552 }
553 if (error) {
554 if (top)
555 m_freem (top);
556 return error;
557 }
558
559 top->m_pkthdr.len = tlen;
560 top->m_pkthdr.rcvif = ifp;
561
562#if NBPFILTER > 0
563 if (ifp->if_bpf) {
564 /*
565 * We need to prepend the address family as
566 * a four byte field. Cons up a dummy header
567 * to pacify bpf. This is safe because bpf
568 * will only read from the mbuf (i.e., it won't
569 * try to free it or keep a pointer to it).
570 */
571 struct mbuf m;
572 u_int af = AF_INET;
573
574 m.m_next = top;
575 m.m_len = 4;
576 m.m_data = (char *)⁡
577
578 bpf_mtap(ifp, &m);
579 }
580#endif
581
582#ifdef INET
583 s = splimp();
584 if (IF_QFULL (&ipintrq)) {
585 IF_DROP(&ipintrq);
586 splx(s);
587 ifp->if_collisions++;
588 m_freem(top);
589 return ENOBUFS;
590 }
591 IF_ENQUEUE(&ipintrq, top);
592 splx(s);
593 ifp->if_ibytes += tlen;
594 ifp->if_ipackets++;
595 schednetisr(NETISR_IP);
596#endif
597 return error;
598}
599
600/*
601 * tunpoll - the poll interface, this is only useful on reads
602 * really. The write detect always returns true, write never blocks
603 * anyway, it either accepts the packet or drops it.
604 */
605static int
606tunpoll(dev, events, p)
607 dev_t dev;
608 int events;
609 struct proc *p;
610{
611 int unit = dev_val(minor(dev)), s;
612 struct tun_softc *tp = &tunctl[unit];
613 struct ifnet *ifp = &tp->tun_if;
614 int revents = 0;
615
616 s = splimp();
617 TUNDEBUG("%s%d: tunpoll\n", ifp->if_name, ifp->if_unit);
618
619 if (events & (POLLIN | POLLRDNORM))
620 if (ifp->if_snd.ifq_len > 0) {
621 TUNDEBUG("%s%d: tunpoll q=%d\n", ifp->if_name,
622 ifp->if_unit, ifp->if_snd.ifq_len);
623 revents |= events & (POLLIN | POLLRDNORM);
624 } else {
625 TUNDEBUG("%s%d: tunpoll waiting\n", ifp->if_name,
626 ifp->if_unit);
627 selrecord(p, &tp->tun_rsel);
628 }
629
630 if (events & (POLLOUT | POLLWRNORM))
631 revents |= events & (POLLOUT | POLLWRNORM);
632
633 splx(s);
634 return (revents);
635}
636
637
638#endif /* NTUN */
|