1/*-
2 * Copyright (c) 1998 Mark Newton
3 * Copyright (c) 1994 Christos Zoulas
4 * Copyright (c) 1997 Todd Vierling
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The names of the authors may not be used to endorse or promote products
16 * derived from this software without specific prior written permission
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * Stolen from NetBSD /sys/compat/svr4/svr4_net.c. Pseudo-device driver
30 * skeleton produced from /usr/share/examples/drivers/make_pseudo_driver.sh
31 * in 3.0-980524-SNAP then hacked a bit (but probably not enough :-).
32 *
33 */
34
35#include <sys/cdefs.h>
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36__FBSDID("$FreeBSD: head/sys/dev/streams/streams.c 139749 2005-01-06 01:43:34Z imp $");
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| 36__FBSDID("$FreeBSD: head/sys/dev/streams/streams.c 141466 2005-02-07 18:22:20Z jhb $"); |
37
38#include <sys/param.h>
39#include <sys/systm.h>
40#include <sys/kernel.h> /* SYSINIT stuff */
41#include <sys/conf.h> /* cdevsw stuff */
42#include <sys/malloc.h> /* malloc region definitions */
43#include <sys/file.h>
44#include <sys/filedesc.h>
45#include <sys/unistd.h>
46#include <sys/fcntl.h>
47#include <sys/socket.h>
48#include <sys/protosw.h>
49#include <sys/socketvar.h>
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| 50#include <sys/syscallsubr.h> |
51#include <sys/un.h>
52#include <sys/domain.h>
53#include <net/if.h>
54#include <netinet/in.h>
55#include <sys/proc.h>
56#include <sys/uio.h>
57
58#include <sys/sysproto.h>
59
60#include <compat/svr4/svr4_types.h>
61#include <compat/svr4/svr4_util.h>
62#include <compat/svr4/svr4_signal.h>
63#include <compat/svr4/svr4_ioctl.h>
64#include <compat/svr4/svr4_stropts.h>
65#include <compat/svr4/svr4_socket.h>
66
67static int svr4_soo_close(struct file *, struct thread *);
68static int svr4_ptm_alloc(struct thread *);
69static d_open_t streamsopen;
70
71struct svr4_sockcache_head svr4_head;
72
73/* Initialization flag (set/queried by svr4_mod LKM) */
74int svr4_str_initialized = 0;
75
76/*
77 * Device minor numbers
78 */
79enum {
80 dev_ptm = 10,
81 dev_arp = 26,
82 dev_icmp = 27,
83 dev_ip = 28,
84 dev_tcp = 35,
85 dev_udp = 36,
86 dev_rawip = 37,
87 dev_unix_dgram = 38,
88 dev_unix_stream = 39,
89 dev_unix_ord_stream = 40
90};
91
92static struct cdev *dt_ptm, *dt_arp, *dt_icmp, *dt_ip, *dt_tcp, *dt_udp, *dt_rawip,
93 *dt_unix_dgram, *dt_unix_stream, *dt_unix_ord_stream;
94
95static struct fileops svr4_netops = {
96 .fo_read = soo_read,
97 .fo_write = soo_write,
98 .fo_ioctl = soo_ioctl,
99 .fo_poll = soo_poll,
100 .fo_kqfilter = soo_kqfilter,
101 .fo_stat = soo_stat,
102 .fo_close = svr4_soo_close
103};
104
105static struct cdevsw streams_cdevsw = {
106 .d_version = D_VERSION,
107 .d_flags = D_NEEDGIANT,
108 .d_open = streamsopen,
109 .d_name = "streams",
110};
111
112struct streams_softc {
113 struct isa_device *dev;
114} ;
115
116#define UNIT(dev) minor(dev) /* assume one minor number per unit */
117
118typedef struct streams_softc *sc_p;
119
120static int
121streams_modevent(module_t mod, int type, void *unused)
122{
123 switch (type) {
124 case MOD_LOAD:
125 /* XXX should make sure it isn't already loaded first */
126 dt_ptm = make_dev(&streams_cdevsw, dev_ptm, 0, 0, 0666,
127 "ptm");
128 dt_arp = make_dev(&streams_cdevsw, dev_arp, 0, 0, 0666,
129 "arp");
130 dt_icmp = make_dev(&streams_cdevsw, dev_icmp, 0, 0, 0666,
131 "icmp");
132 dt_ip = make_dev(&streams_cdevsw, dev_ip, 0, 0, 0666,
133 "ip");
134 dt_tcp = make_dev(&streams_cdevsw, dev_tcp, 0, 0, 0666,
135 "tcp");
136 dt_udp = make_dev(&streams_cdevsw, dev_udp, 0, 0, 0666,
137 "udp");
138 dt_rawip = make_dev(&streams_cdevsw, dev_rawip, 0, 0, 0666,
139 "rawip");
140 dt_unix_dgram = make_dev(&streams_cdevsw, dev_unix_dgram,
141 0, 0, 0666, "ticlts");
142 dt_unix_stream = make_dev(&streams_cdevsw, dev_unix_stream,
143 0, 0, 0666, "ticots");
144 dt_unix_ord_stream = make_dev(&streams_cdevsw,
145 dev_unix_ord_stream, 0, 0, 0666, "ticotsord");
146
147 if (! (dt_ptm && dt_arp && dt_icmp && dt_ip && dt_tcp &&
148 dt_udp && dt_rawip && dt_unix_dgram &&
149 dt_unix_stream && dt_unix_ord_stream)) {
150 printf("WARNING: device config for STREAMS failed\n");
151 printf("Suggest unloading streams KLD\n");
152 }
153 return 0;
154 case MOD_UNLOAD:
155 /* XXX should check to see if it's busy first */
156 destroy_dev(dt_ptm);
157 destroy_dev(dt_arp);
158 destroy_dev(dt_icmp);
159 destroy_dev(dt_ip);
160 destroy_dev(dt_tcp);
161 destroy_dev(dt_udp);
162 destroy_dev(dt_rawip);
163 destroy_dev(dt_unix_dgram);
164 destroy_dev(dt_unix_stream);
165 destroy_dev(dt_unix_ord_stream);
166
167 return 0;
168 default:
169 return EOPNOTSUPP;
170 break;
171 }
172 return 0;
173}
174
175static moduledata_t streams_mod = {
176 "streams",
177 streams_modevent,
178 0
179};
180DECLARE_MODULE(streams, streams_mod, SI_SUB_DRIVERS, SI_ORDER_ANY);
181MODULE_VERSION(streams, 1);
182
183/*
184 * We only need open() and close() routines. open() calls socreate()
185 * to allocate a "real" object behind the stream and mallocs some state
186 * info for use by the svr4 emulator; close() deallocates the state
187 * information and passes the underlying object to the normal socket close
188 * routine.
189 */
190static int
191streamsopen(struct cdev *dev, int oflags, int devtype, struct thread *td)
192{
193 int type, protocol;
194 int fd, extraref;
195 struct file *fp;
196 struct socket *so;
197 int error;
198 int family;
199 struct proc *p = td->td_proc;
200
201 PROC_LOCK(p);
202 if (td->td_dupfd >= 0) {
203 PROC_UNLOCK(p);
204 return ENODEV;
205 }
206 PROC_UNLOCK(p);
207
208 switch (minor(dev)) {
209 case dev_udp:
210 family = AF_INET;
211 type = SOCK_DGRAM;
212 protocol = IPPROTO_UDP;
213 break;
214
215 case dev_tcp:
216 family = AF_INET;
217 type = SOCK_STREAM;
218 protocol = IPPROTO_TCP;
219 break;
220
221 case dev_ip:
222 case dev_rawip:
223 family = AF_INET;
224 type = SOCK_RAW;
225 protocol = IPPROTO_IP;
226 break;
227
228 case dev_icmp:
229 family = AF_INET;
230 type = SOCK_RAW;
231 protocol = IPPROTO_ICMP;
232 break;
233
234 case dev_unix_dgram:
235 family = AF_LOCAL;
236 type = SOCK_DGRAM;
237 protocol = 0;
238 break;
239
240 case dev_unix_stream:
241 case dev_unix_ord_stream:
242 family = AF_LOCAL;
243 type = SOCK_STREAM;
244 protocol = 0;
245 break;
246
247 case dev_ptm:
248 return svr4_ptm_alloc(td);
249
250 default:
251 return EOPNOTSUPP;
252 }
253
254 if ((error = falloc(td, &fp, &fd)) != 0)
255 return error;
256 /* An extra reference on `fp' has been held for us by falloc(). */
257
258 if ((error = socreate(family, &so, type, protocol,
259 td->td_ucred, td)) != 0) {
260 FILEDESC_LOCK_FAST(p->p_fd);
261 /* Check the fd table entry hasn't changed since we made it. */
262 extraref = 0;
263 if (p->p_fd->fd_ofiles[fd] == fp) {
264 p->p_fd->fd_ofiles[fd] = NULL;
265 extraref = 1;
266 }
267 FILEDESC_UNLOCK_FAST(p->p_fd);
268 if (extraref)
269 fdrop(fp, td);
270 fdrop(fp, td);
271 return error;
272 }
273
274 FILEDESC_LOCK_FAST(p->p_fd);
275 fp->f_data = so;
276 fp->f_flag = FREAD|FWRITE;
277 fp->f_ops = &svr4_netops;
278 fp->f_type = DTYPE_SOCKET;
279 FILEDESC_UNLOCK_FAST(p->p_fd);
280
281 (void)svr4_stream_get(fp);
282 fdrop(fp, td);
283 PROC_LOCK(p);
284 td->td_dupfd = fd;
285 PROC_UNLOCK(p);
286 return ENXIO;
287}
288
289static int
290svr4_ptm_alloc(td)
291 struct thread *td;
292{
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292 struct proc *p = td->td_proc;
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293 /*
294 * XXX this is very, very ugly. But I can't find a better
295 * way that won't duplicate a big amount of code from
296 * sys_open(). Ho hum...
297 *
298 * Fortunately for us, Solaris (at least 2.5.1) makes the
299 * /dev/ptmx open automatically just open a pty, that (after
300 * STREAMS I_PUSHes), is just a plain pty. fstat() is used
301 * to get the minor device number to map to a tty.
302 *
303 * Cycle through the names. If sys_open() returns ENOENT (or
304 * ENXIO), short circuit the cycle and exit.
305 */
306 static char ptyname[] = "/dev/ptyXX";
307 static char ttyletters[] = "pqrstuwxyzPQRST";
308 static char ttynumbers[] = "0123456789abcdef";
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309 caddr_t sg = stackgap_init();
310 char *path = stackgap_alloc(&sg, sizeof(ptyname));
311 struct open_args oa;
312 int l = 0, n = 0;
313 register_t fd = -1;
314 int error;
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309 struct proc *p;
310 register_t fd;
311 int error, l, n; |
312
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316 oa.path = path;
317 oa.flags = O_RDWR;
318 oa.mode = 0;
319
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313 fd = -1;
314 n = 0;
315 l = 0;
316 p = td->td_proc; |
317 while (fd == -1) {
318 ptyname[8] = ttyletters[l];
319 ptyname[9] = ttynumbers[n];
320
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324 if ((error = copyout(ptyname, path, sizeof(ptyname))) != 0)
325 return error;
326
327 switch (error = open(td, &oa)) {
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321 error = kern_open(td, ptyname, UIO_SYSSPACE, O_RDWR, 0);
322 switch (error) { |
323 case ENOENT:
324 case ENXIO:
325 return error;
326 case 0:
327 PROC_LOCK(p);
328 td->td_dupfd = td->td_retval[0];
329 PROC_UNLOCK(p);
330 return ENXIO;
331 default:
332 if (ttynumbers[++n] == '\0') {
333 if (ttyletters[++l] == '\0')
334 break;
335 n = 0;
336 }
337 }
338 }
339 return ENOENT;
340}
341
342
343struct svr4_strm *
344svr4_stream_get(fp)
345 struct file *fp;
346{
347 struct socket *so;
348 struct svr4_strm *st;
349
350 if (fp == NULL || fp->f_type != DTYPE_SOCKET)
351 return NULL;
352
353 so = fp->f_data;
354
355 /*
356 * mpfixme: lock socketbuffer here
357 */
358 if (so->so_emuldata) {
359 return so->so_emuldata;
360 }
361
362 /* Allocate a new one. */
363 st = malloc(sizeof(struct svr4_strm), M_TEMP, M_WAITOK);
364 st->s_family = so->so_proto->pr_domain->dom_family;
365 st->s_cmd = ~0;
366 st->s_afd = -1;
367 st->s_eventmask = 0;
368 /*
369 * avoid a race where we loose due to concurrancy issues
370 * of two threads trying to allocate the so_emuldata.
371 */
372 if (so->so_emuldata) {
373 /* lost the race, use the existing emuldata */
374 FREE(st, M_TEMP);
375 st = so->so_emuldata;
376 } else {
377 /* we won, or there was no race, use our copy */
378 so->so_emuldata = st;
379 fp->f_ops = &svr4_netops;
380 }
381
382 return st;
383}
384
385void
386svr4_delete_socket(p, fp)
387 struct proc *p;
388 struct file *fp;
389{
390 struct svr4_sockcache_entry *e;
391 void *cookie = ((struct socket *)fp->f_data)->so_emuldata;
392
393 while (svr4_str_initialized != 2) {
394 if (atomic_cmpset_acq_int(&svr4_str_initialized, 0, 1)) {
395 TAILQ_INIT(&svr4_head);
396 atomic_store_rel_int(&svr4_str_initialized, 2);
397 }
398 return;
399 }
400
401 TAILQ_FOREACH(e, &svr4_head, entries)
402 if (e->p == p && e->cookie == cookie) {
403 TAILQ_REMOVE(&svr4_head, e, entries);
404 DPRINTF(("svr4_delete_socket: %s [%p,%d,%d]\n",
405 e->sock.sun_path, p, (int)e->dev, e->ino));
406 free(e, M_TEMP);
407 return;
408 }
409}
410
411static int
412svr4_soo_close(struct file *fp, struct thread *td)
413{
414 struct socket *so = fp->f_data;
415
416 /* CHECKUNIT_DIAG(ENXIO);*/
417
418 svr4_delete_socket(td->td_proc, fp);
419 free(so->so_emuldata, M_TEMP);
420 return soo_close(fp, td);
421}
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