1/*
2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 */
30
31#include <sys/cdefs.h>
| 1/*
2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 */
30
31#include <sys/cdefs.h>
|
33
34/*
35 * Pseudo-nulmodem driver
36 * Mighty handy for use with serial console in Vmware
37 */
38
39#include "opt_compat.h"
40#include "opt_tty.h"
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/proc.h>
45#include <sys/tty.h>
46#include <sys/conf.h>
47#include <sys/fcntl.h>
48#include <sys/poll.h>
49#include <sys/kernel.h>
50#include <sys/module.h>
51#include <sys/vnode.h>
52#include <sys/signalvar.h>
53#include <sys/malloc.h>
54#include <sys/taskqueue.h>
55
56MALLOC_DEFINE(M_NLMDM, "nullmodem", "nullmodem data structures");
57
58static void nmdmstart(struct tty *tp);
59static void nmdmstop(struct tty *tp, int rw);
60static void nmdminit(struct cdev *dev);
61
62static d_open_t nmdmopen;
63static d_close_t nmdmclose;
64
65static struct cdevsw nmdm_cdevsw = {
66 .d_version = D_VERSION,
67 .d_open = nmdmopen,
68 .d_close = nmdmclose,
69 .d_name = "nmdn",
70 .d_flags = D_TTY | D_PSEUDO | D_NEEDGIANT,
71};
72
73#define BUFSIZ 100 /* Chunk size iomoved to/from user */
74#define NMDM_MAX_NUM 128 /* Artificially limit # devices. */
75#define PF_STOPPED 0x10 /* user told stopped */
76#define BFLAG CLONE_FLAG0
77
78struct softpart {
79 struct tty *nm_tty;
80 struct cdev *dev;
81 int dcd;
82 struct task pt_task;
83 struct softpart *other;
84};
85
86struct nm_softc {
87 TAILQ_ENTRY(nm_softc) pt_list;
88 int pt_flags;
89 struct softpart part1, part2;
90 struct prison *pt_prison;
91};
92
93static struct clonedevs *nmdmclones;
94static TAILQ_HEAD(,nm_softc) nmdmhead = TAILQ_HEAD_INITIALIZER(nmdmhead);
95
96static void
97nmdm_clone(void *arg, char *name, int nameen, struct cdev **dev)
98{
99 int i, unit;
100 char *p;
101 struct cdev *d1, *d2;
102
| 33
34/*
35 * Pseudo-nulmodem driver
36 * Mighty handy for use with serial console in Vmware
37 */
38
39#include "opt_compat.h"
40#include "opt_tty.h"
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/proc.h>
45#include <sys/tty.h>
46#include <sys/conf.h>
47#include <sys/fcntl.h>
48#include <sys/poll.h>
49#include <sys/kernel.h>
50#include <sys/module.h>
51#include <sys/vnode.h>
52#include <sys/signalvar.h>
53#include <sys/malloc.h>
54#include <sys/taskqueue.h>
55
56MALLOC_DEFINE(M_NLMDM, "nullmodem", "nullmodem data structures");
57
58static void nmdmstart(struct tty *tp);
59static void nmdmstop(struct tty *tp, int rw);
60static void nmdminit(struct cdev *dev);
61
62static d_open_t nmdmopen;
63static d_close_t nmdmclose;
64
65static struct cdevsw nmdm_cdevsw = {
66 .d_version = D_VERSION,
67 .d_open = nmdmopen,
68 .d_close = nmdmclose,
69 .d_name = "nmdn",
70 .d_flags = D_TTY | D_PSEUDO | D_NEEDGIANT,
71};
72
73#define BUFSIZ 100 /* Chunk size iomoved to/from user */
74#define NMDM_MAX_NUM 128 /* Artificially limit # devices. */
75#define PF_STOPPED 0x10 /* user told stopped */
76#define BFLAG CLONE_FLAG0
77
78struct softpart {
79 struct tty *nm_tty;
80 struct cdev *dev;
81 int dcd;
82 struct task pt_task;
83 struct softpart *other;
84};
85
86struct nm_softc {
87 TAILQ_ENTRY(nm_softc) pt_list;
88 int pt_flags;
89 struct softpart part1, part2;
90 struct prison *pt_prison;
91};
92
93static struct clonedevs *nmdmclones;
94static TAILQ_HEAD(,nm_softc) nmdmhead = TAILQ_HEAD_INITIALIZER(nmdmhead);
95
96static void
97nmdm_clone(void *arg, char *name, int nameen, struct cdev **dev)
98{
99 int i, unit;
100 char *p;
101 struct cdev *d1, *d2;
102
|
104 return;
105 if (strcmp(name, "nmdm") == 0) {
106 p = NULL;
107 unit = -1;
108 } else {
109 i = dev_stdclone(name, &p, "nmdm", &unit);
110 if (i == 0)
111 return;
112 if (p[0] != '\0' && p[0] != 'A' && p[0] != 'B')
113 return;
114 else if (p[0] != '\0' && p[1] != '\0')
115 return;
116 }
117 i = clone_create(&nmdmclones, &nmdm_cdevsw, &unit, &d1, 0);
118 if (i) {
119 d1 = make_dev(&nmdm_cdevsw, unit2minor(unit),
120 0, 0, 0666, "nmdm%dA", unit);
121 if (d1 == NULL)
122 return;
123 d2 = make_dev(&nmdm_cdevsw, unit2minor(unit) | BFLAG,
124 0, 0, 0666, "nmdm%dB", unit);
125 if (d2 == NULL) {
126 destroy_dev(d1);
127 return;
128 }
129 d2->si_drv2 = d1;
130 d1->si_drv2 = d2;
131 dev_depends(d1, d2);
132 dev_depends(d2, d1);
133 d1->si_flags |= SI_CHEAPCLONE;
134 d2->si_flags |= SI_CHEAPCLONE;
135 }
136 if (p != NULL && p[0] == 'B')
137 *dev = d1->si_drv2;
138 else
139 *dev = d1;
140}
141
142static void
143nmdm_task_tty(void *arg, int pending __unused)
144{
145 struct tty *tp, *otp;
146 struct softpart *sp;
147 int c;
148
149 tp = arg;
150 sp = tp->t_sc;
151 otp = sp->other->nm_tty;
152 KASSERT(otp != NULL, ("NULL otp in nmdmstart"));
153 KASSERT(otp != tp, ("NULL otp == tp nmdmstart"));
154 if (sp->other->dcd) {
155 if (!(tp->t_state & TS_ISOPEN)) {
156 sp->other->dcd = 0;
157 (void)ttyld_modem(otp, 0);
158 }
159 } else {
160 if (tp->t_state & TS_ISOPEN) {
161 sp->other->dcd = 1;
162 (void)ttyld_modem(otp, 1);
163 }
164 }
165 if (tp->t_state & TS_TTSTOP)
166 return;
167 while (tp->t_outq.c_cc != 0) {
168 if (otp->t_state & TS_TBLOCK)
169 return;
170 c = getc(&tp->t_outq);
171 if (otp->t_state & TS_ISOPEN)
172 ttyld_rint(otp, c);
173 }
174 if (tp->t_outq.c_cc == 0)
175 ttwwakeup(tp);
176}
177
178/*
179 * This function creates and initializes a pair of ttys.
180 */
181static void
182nmdminit(struct cdev *dev1)
183{
184 struct cdev *dev2;
185 struct nm_softc *pt;
186
187 dev2 = dev1->si_drv2;
188
189 dev1->si_flags &= ~SI_CHEAPCLONE;
190 dev2->si_flags &= ~SI_CHEAPCLONE;
191
192 pt = malloc(sizeof(*pt), M_NLMDM, M_WAITOK | M_ZERO);
193 TAILQ_INSERT_TAIL(&nmdmhead, pt, pt_list);
194
195 dev1->si_drv1 = dev2->si_drv1 = pt;
196
197 pt->part1.dev = dev1;
198 pt->part2.dev = dev2;
199
200 pt->part1.nm_tty = ttymalloc(pt->part1.nm_tty);
201 pt->part1.nm_tty->t_oproc = nmdmstart;
202 pt->part1.nm_tty->t_stop = nmdmstop;
203 pt->part1.nm_tty->t_dev = dev1;
204 pt->part1.nm_tty->t_sc = &pt->part1;
205 TASK_INIT(&pt->part1.pt_task, 0, nmdm_task_tty, pt->part1.nm_tty);
206
207 pt->part2.nm_tty = ttymalloc(pt->part2.nm_tty);
208 pt->part2.nm_tty->t_oproc = nmdmstart;
209 pt->part2.nm_tty->t_stop = nmdmstop;
210 pt->part2.nm_tty->t_dev = dev2;
211 pt->part2.nm_tty->t_sc = &pt->part2;
212 TASK_INIT(&pt->part2.pt_task, 0, nmdm_task_tty, pt->part2.nm_tty);
213
214 pt->part1.other = &pt->part2;
215 pt->part2.other = &pt->part1;
216
217 dev1->si_tty = pt->part1.nm_tty;
218 dev1->si_drv1 = pt;
219
220 dev2->si_tty = pt->part2.nm_tty;
221 dev2->si_drv1 = pt;
222}
223
224/*
225 * Device opened from userland
226 */
227static int
228nmdmopen(struct cdev *dev, int flag, int devtype, struct thread *td)
229{
230 struct tty *tp, *tp2;
231 int error;
232 struct nm_softc *pti;
233 struct softpart *sp;
234
235 if (dev->si_drv1 == NULL)
236 nmdminit(dev);
237 pti = dev->si_drv1;
238 if (pti->pt_prison != td->td_ucred->cr_prison)
239 return (EBUSY);
240
241 tp = dev->si_tty;
242 sp = tp->t_sc;
243 tp2 = sp->other->nm_tty;
244
245 if ((tp->t_state & TS_ISOPEN) == 0) {
246 ttychars(tp); /* Set up default chars */
247 tp->t_iflag = TTYDEF_IFLAG;
248 tp->t_oflag = TTYDEF_OFLAG;
249 tp->t_lflag = TTYDEF_LFLAG;
250 tp->t_lflag = 0;
251 tp->t_cflag = TTYDEF_CFLAG;
252 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
253 ttsetwater(tp); /* XXX ? */
254 } else if (tp->t_state & TS_XCLUDE && suser(td)) {
255 return (EBUSY);
256 }
257
258 error = ttyld_open(tp, dev);
259 return (error);
260}
261
262static int
263nmdmclose(struct cdev *dev, int flag, int mode, struct thread *td)
264{
265
266 return (ttyclose(dev->si_tty));
267}
268
269static void
270nmdmstart(struct tty *tp)
271{
272 struct softpart *pt;
273
274 pt = tp->t_sc;
275 taskqueue_enqueue(taskqueue_swi_giant, &pt->pt_task);
276}
277
278static void
279nmdmstop(struct tty *tp, int flush)
280{
281 struct softpart *pt;
282
283 pt = tp->t_sc;
284 taskqueue_enqueue(taskqueue_swi_giant, &pt->pt_task);
285}
286
287/*
288 * Module handling
289 */
290static int
291nmdm_modevent(module_t mod, int type, void *data)
292{
293 static eventhandler_tag tag;
294 struct nm_softc *pt, *tpt;
295 int error = 0;
296
297 switch(type) {
298 case MOD_LOAD:
299 clone_setup(&nmdmclones);
300 tag = EVENTHANDLER_REGISTER(dev_clone, nmdm_clone, 0, 1000);
301 if (tag == NULL)
302 return (ENOMEM);
303 break;
304
305 case MOD_SHUTDOWN:
306 /* FALLTHROUGH */
307 case MOD_UNLOAD:
308 EVENTHANDLER_DEREGISTER(dev_clone, tag);
309 TAILQ_FOREACH_SAFE(pt, &nmdmhead, pt_list, tpt) {
310 destroy_dev(pt->part1.dev);
311 TAILQ_REMOVE(&nmdmhead, pt, pt_list);
312 free(pt, M_NLMDM);
313 }
314 clone_cleanup(&nmdmclones);
315 break;
316 default:
317 error = EOPNOTSUPP;
318 }
319 return (error);
320}
321
322DEV_MODULE(nmdm, nmdm_modevent, NULL);
| 104 return;
105 if (strcmp(name, "nmdm") == 0) {
106 p = NULL;
107 unit = -1;
108 } else {
109 i = dev_stdclone(name, &p, "nmdm", &unit);
110 if (i == 0)
111 return;
112 if (p[0] != '\0' && p[0] != 'A' && p[0] != 'B')
113 return;
114 else if (p[0] != '\0' && p[1] != '\0')
115 return;
116 }
117 i = clone_create(&nmdmclones, &nmdm_cdevsw, &unit, &d1, 0);
118 if (i) {
119 d1 = make_dev(&nmdm_cdevsw, unit2minor(unit),
120 0, 0, 0666, "nmdm%dA", unit);
121 if (d1 == NULL)
122 return;
123 d2 = make_dev(&nmdm_cdevsw, unit2minor(unit) | BFLAG,
124 0, 0, 0666, "nmdm%dB", unit);
125 if (d2 == NULL) {
126 destroy_dev(d1);
127 return;
128 }
129 d2->si_drv2 = d1;
130 d1->si_drv2 = d2;
131 dev_depends(d1, d2);
132 dev_depends(d2, d1);
133 d1->si_flags |= SI_CHEAPCLONE;
134 d2->si_flags |= SI_CHEAPCLONE;
135 }
136 if (p != NULL && p[0] == 'B')
137 *dev = d1->si_drv2;
138 else
139 *dev = d1;
140}
141
142static void
143nmdm_task_tty(void *arg, int pending __unused)
144{
145 struct tty *tp, *otp;
146 struct softpart *sp;
147 int c;
148
149 tp = arg;
150 sp = tp->t_sc;
151 otp = sp->other->nm_tty;
152 KASSERT(otp != NULL, ("NULL otp in nmdmstart"));
153 KASSERT(otp != tp, ("NULL otp == tp nmdmstart"));
154 if (sp->other->dcd) {
155 if (!(tp->t_state & TS_ISOPEN)) {
156 sp->other->dcd = 0;
157 (void)ttyld_modem(otp, 0);
158 }
159 } else {
160 if (tp->t_state & TS_ISOPEN) {
161 sp->other->dcd = 1;
162 (void)ttyld_modem(otp, 1);
163 }
164 }
165 if (tp->t_state & TS_TTSTOP)
166 return;
167 while (tp->t_outq.c_cc != 0) {
168 if (otp->t_state & TS_TBLOCK)
169 return;
170 c = getc(&tp->t_outq);
171 if (otp->t_state & TS_ISOPEN)
172 ttyld_rint(otp, c);
173 }
174 if (tp->t_outq.c_cc == 0)
175 ttwwakeup(tp);
176}
177
178/*
179 * This function creates and initializes a pair of ttys.
180 */
181static void
182nmdminit(struct cdev *dev1)
183{
184 struct cdev *dev2;
185 struct nm_softc *pt;
186
187 dev2 = dev1->si_drv2;
188
189 dev1->si_flags &= ~SI_CHEAPCLONE;
190 dev2->si_flags &= ~SI_CHEAPCLONE;
191
192 pt = malloc(sizeof(*pt), M_NLMDM, M_WAITOK | M_ZERO);
193 TAILQ_INSERT_TAIL(&nmdmhead, pt, pt_list);
194
195 dev1->si_drv1 = dev2->si_drv1 = pt;
196
197 pt->part1.dev = dev1;
198 pt->part2.dev = dev2;
199
200 pt->part1.nm_tty = ttymalloc(pt->part1.nm_tty);
201 pt->part1.nm_tty->t_oproc = nmdmstart;
202 pt->part1.nm_tty->t_stop = nmdmstop;
203 pt->part1.nm_tty->t_dev = dev1;
204 pt->part1.nm_tty->t_sc = &pt->part1;
205 TASK_INIT(&pt->part1.pt_task, 0, nmdm_task_tty, pt->part1.nm_tty);
206
207 pt->part2.nm_tty = ttymalloc(pt->part2.nm_tty);
208 pt->part2.nm_tty->t_oproc = nmdmstart;
209 pt->part2.nm_tty->t_stop = nmdmstop;
210 pt->part2.nm_tty->t_dev = dev2;
211 pt->part2.nm_tty->t_sc = &pt->part2;
212 TASK_INIT(&pt->part2.pt_task, 0, nmdm_task_tty, pt->part2.nm_tty);
213
214 pt->part1.other = &pt->part2;
215 pt->part2.other = &pt->part1;
216
217 dev1->si_tty = pt->part1.nm_tty;
218 dev1->si_drv1 = pt;
219
220 dev2->si_tty = pt->part2.nm_tty;
221 dev2->si_drv1 = pt;
222}
223
224/*
225 * Device opened from userland
226 */
227static int
228nmdmopen(struct cdev *dev, int flag, int devtype, struct thread *td)
229{
230 struct tty *tp, *tp2;
231 int error;
232 struct nm_softc *pti;
233 struct softpart *sp;
234
235 if (dev->si_drv1 == NULL)
236 nmdminit(dev);
237 pti = dev->si_drv1;
238 if (pti->pt_prison != td->td_ucred->cr_prison)
239 return (EBUSY);
240
241 tp = dev->si_tty;
242 sp = tp->t_sc;
243 tp2 = sp->other->nm_tty;
244
245 if ((tp->t_state & TS_ISOPEN) == 0) {
246 ttychars(tp); /* Set up default chars */
247 tp->t_iflag = TTYDEF_IFLAG;
248 tp->t_oflag = TTYDEF_OFLAG;
249 tp->t_lflag = TTYDEF_LFLAG;
250 tp->t_lflag = 0;
251 tp->t_cflag = TTYDEF_CFLAG;
252 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
253 ttsetwater(tp); /* XXX ? */
254 } else if (tp->t_state & TS_XCLUDE && suser(td)) {
255 return (EBUSY);
256 }
257
258 error = ttyld_open(tp, dev);
259 return (error);
260}
261
262static int
263nmdmclose(struct cdev *dev, int flag, int mode, struct thread *td)
264{
265
266 return (ttyclose(dev->si_tty));
267}
268
269static void
270nmdmstart(struct tty *tp)
271{
272 struct softpart *pt;
273
274 pt = tp->t_sc;
275 taskqueue_enqueue(taskqueue_swi_giant, &pt->pt_task);
276}
277
278static void
279nmdmstop(struct tty *tp, int flush)
280{
281 struct softpart *pt;
282
283 pt = tp->t_sc;
284 taskqueue_enqueue(taskqueue_swi_giant, &pt->pt_task);
285}
286
287/*
288 * Module handling
289 */
290static int
291nmdm_modevent(module_t mod, int type, void *data)
292{
293 static eventhandler_tag tag;
294 struct nm_softc *pt, *tpt;
295 int error = 0;
296
297 switch(type) {
298 case MOD_LOAD:
299 clone_setup(&nmdmclones);
300 tag = EVENTHANDLER_REGISTER(dev_clone, nmdm_clone, 0, 1000);
301 if (tag == NULL)
302 return (ENOMEM);
303 break;
304
305 case MOD_SHUTDOWN:
306 /* FALLTHROUGH */
307 case MOD_UNLOAD:
308 EVENTHANDLER_DEREGISTER(dev_clone, tag);
309 TAILQ_FOREACH_SAFE(pt, &nmdmhead, pt_list, tpt) {
310 destroy_dev(pt->part1.dev);
311 TAILQ_REMOVE(&nmdmhead, pt, pt_list);
312 free(pt, M_NLMDM);
313 }
314 clone_cleanup(&nmdmclones);
315 break;
316 default:
317 error = EOPNOTSUPP;
318 }
319 return (error);
320}
321
322DEV_MODULE(nmdm, nmdm_modevent, NULL);
|