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>
36 __FBSDID("$FreeBSD: releng/7.3/sys/dev/streams/streams.c 171744 2007-08-06 14:26:03Z rwatson $");
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>
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
67 static int svr4_soo_close(struct file *, struct thread *);
68 static int svr4_ptm_alloc(struct thread *);
69 static d_open_t streamsopen;
70
71 /*
72 * Device minor numbers
73 */
74 enum {
75 dev_ptm = 10,
76 dev_arp = 26,
77 dev_icmp = 27,
78 dev_ip = 28,
79 dev_tcp = 35,
80 dev_udp = 36,
81 dev_rawip = 37,
82 dev_unix_dgram = 38,
83 dev_unix_stream = 39,
84 dev_unix_ord_stream = 40
85 };
86
87 static struct cdev *dt_ptm, *dt_arp, *dt_icmp, *dt_ip, *dt_tcp, *dt_udp,
88 *dt_rawip, *dt_unix_dgram, *dt_unix_stream, *dt_unix_ord_stream;
89
90 static struct fileops svr4_netops = {
91 .fo_read = soo_read,
92 .fo_write = soo_write,
93 .fo_ioctl = soo_ioctl,
94 .fo_poll = soo_poll,
95 .fo_kqfilter = soo_kqfilter,
96 .fo_stat = soo_stat,
97 .fo_close = svr4_soo_close
98 };
99
100 static struct cdevsw streams_cdevsw = {
101 .d_version = D_VERSION,
102 .d_open = streamsopen,
103 .d_name = "streams",
104 };
105
106 struct streams_softc {
107 struct isa_device *dev;
108 } ;
109
110 #define UNIT(dev) minor(dev) /* assume one minor number per unit */
111
112 typedef struct streams_softc *sc_p;
113
114 static int
115 streams_modevent(module_t mod, int type, void *unused)
116 {
117 switch (type) {
118 case MOD_LOAD:
119 dt_ptm = make_dev(&streams_cdevsw, dev_ptm, 0, 0, 0666,
120 "ptm");
121 dt_arp = make_dev(&streams_cdevsw, dev_arp, 0, 0, 0666,
122 "arp");
123 dt_icmp = make_dev(&streams_cdevsw, dev_icmp, 0, 0, 0666,
124 "icmp");
125 dt_ip = make_dev(&streams_cdevsw, dev_ip, 0, 0, 0666,
126 "ip");
127 dt_tcp = make_dev(&streams_cdevsw, dev_tcp, 0, 0, 0666,
128 "tcp");
129 dt_udp = make_dev(&streams_cdevsw, dev_udp, 0, 0, 0666,
130 "udp");
131 dt_rawip = make_dev(&streams_cdevsw, dev_rawip, 0, 0, 0666,
132 "rawip");
133 dt_unix_dgram = make_dev(&streams_cdevsw, dev_unix_dgram,
134 0, 0, 0666, "ticlts");
135 dt_unix_stream = make_dev(&streams_cdevsw, dev_unix_stream,
136 0, 0, 0666, "ticots");
137 dt_unix_ord_stream = make_dev(&streams_cdevsw,
138 dev_unix_ord_stream, 0, 0, 0666, "ticotsord");
139
140 if (! (dt_ptm && dt_arp && dt_icmp && dt_ip && dt_tcp &&
141 dt_udp && dt_rawip && dt_unix_dgram &&
142 dt_unix_stream && dt_unix_ord_stream)) {
143 printf("WARNING: device config for STREAMS failed\n");
144 printf("Suggest unloading streams KLD\n");
145 }
146 return 0;
147 case MOD_UNLOAD:
148 /* XXX should check to see if it's busy first */
149 destroy_dev(dt_ptm);
150 destroy_dev(dt_arp);
151 destroy_dev(dt_icmp);
152 destroy_dev(dt_ip);
153 destroy_dev(dt_tcp);
154 destroy_dev(dt_udp);
155 destroy_dev(dt_rawip);
156 destroy_dev(dt_unix_dgram);
157 destroy_dev(dt_unix_stream);
158 destroy_dev(dt_unix_ord_stream);
159
160 return 0;
161 default:
162 return EOPNOTSUPP;
163 break;
164 }
165 return 0;
166 }
167
168 static moduledata_t streams_mod = {
169 "streams",
170 streams_modevent,
171 0
172 };
173 DECLARE_MODULE(streams, streams_mod, SI_SUB_DRIVERS, SI_ORDER_ANY);
174 MODULE_VERSION(streams, 1);
175
176 /*
177 * We only need open() and close() routines. open() calls socreate()
178 * to allocate a "real" object behind the stream and mallocs some state
179 * info for use by the svr4 emulator; close() deallocates the state
180 * information and passes the underlying object to the normal socket close
181 * routine.
182 */
183 static int
184 streamsopen(struct cdev *dev, int oflags, int devtype, struct thread *td)
185 {
186 struct filedesc *fdp;
187 struct svr4_strm *st;
188 struct socket *so;
189 struct file *fp;
190 int family, type, protocol;
191 int error, fd;
192
193 if (td->td_dupfd >= 0)
194 return ENODEV;
195
196 switch (minor(dev)) {
197 case dev_udp:
198 family = AF_INET;
199 type = SOCK_DGRAM;
200 protocol = IPPROTO_UDP;
201 break;
202
203 case dev_tcp:
204 family = AF_INET;
205 type = SOCK_STREAM;
206 protocol = IPPROTO_TCP;
207 break;
208
209 case dev_ip:
210 case dev_rawip:
211 family = AF_INET;
212 type = SOCK_RAW;
213 protocol = IPPROTO_IP;
214 break;
215
216 case dev_icmp:
217 family = AF_INET;
218 type = SOCK_RAW;
219 protocol = IPPROTO_ICMP;
220 break;
221
222 case dev_unix_dgram:
223 family = AF_LOCAL;
224 type = SOCK_DGRAM;
225 protocol = 0;
226 break;
227
228 case dev_unix_stream:
229 case dev_unix_ord_stream:
230 family = AF_LOCAL;
231 type = SOCK_STREAM;
232 protocol = 0;
233 break;
234
235 case dev_ptm:
236 return svr4_ptm_alloc(td);
237
238 default:
239 return EOPNOTSUPP;
240 }
241
242 fdp = td->td_proc->p_fd;
243 if ((error = falloc(td, &fp, &fd)) != 0)
244 return error;
245 /* An extra reference on `fp' has been held for us by falloc(). */
246
247 error = socreate(family, &so, type, protocol, td->td_ucred, td);
248 if (error) {
249 fdclose(fdp, fp, fd, td);
250 fdrop(fp, td);
251 return error;
252 }
253
254 FILE_LOCK(fp);
255 fp->f_data = so;
256 fp->f_flag = FREAD|FWRITE;
257 fp->f_ops = &svr4_netops;
258 fp->f_type = DTYPE_SOCKET;
259 FILE_UNLOCK(fp);
260
261 /*
262 * Allocate a stream structure and attach it to this socket.
263 * We don't bother locking so_emuldata for SVR4 stream sockets as
264 * its value is constant for the lifetime of the stream once it
265 * is initialized here.
266 */
267 st = malloc(sizeof(struct svr4_strm), M_TEMP, M_WAITOK);
268 st->s_family = so->so_proto->pr_domain->dom_family;
269 st->s_cmd = ~0;
270 st->s_afd = -1;
271 st->s_eventmask = 0;
272 so->so_emuldata = st;
273
274 fdrop(fp, td);
275 td->td_dupfd = fd;
276 return ENXIO;
277 }
278
279 static int
280 svr4_ptm_alloc(td)
281 struct thread *td;
282 {
283 /*
284 * XXX this is very, very ugly. But I can't find a better
285 * way that won't duplicate a big amount of code from
286 * sys_open(). Ho hum...
287 *
288 * Fortunately for us, Solaris (at least 2.5.1) makes the
289 * /dev/ptmx open automatically just open a pty, that (after
290 * STREAMS I_PUSHes), is just a plain pty. fstat() is used
291 * to get the minor device number to map to a tty.
292 *
293 * Cycle through the names. If sys_open() returns ENOENT (or
294 * ENXIO), short circuit the cycle and exit.
295 */
296 static char ptyname[] = "/dev/ptyXX";
297 static char ttyletters[] = "pqrstuwxyzPQRST";
298 static char ttynumbers[] = "0123456789abcdef";
299 struct proc *p;
300 register_t fd;
301 int error, l, n;
302
303 fd = -1;
304 n = 0;
305 l = 0;
306 p = td->td_proc;
307 while (fd == -1) {
308 ptyname[8] = ttyletters[l];
309 ptyname[9] = ttynumbers[n];
310
311 error = kern_open(td, ptyname, UIO_SYSSPACE, O_RDWR, 0);
312 switch (error) {
313 case ENOENT:
314 case ENXIO:
315 return error;
316 case 0:
317 td->td_dupfd = td->td_retval[0];
318 return ENXIO;
319 default:
320 if (ttynumbers[++n] == '\0') {
321 if (ttyletters[++l] == '\0')
322 break;
323 n = 0;
324 }
325 }
326 }
327 return ENOENT;
328 }
329
330
331 struct svr4_strm *
332 svr4_stream_get(fp)
333 struct file *fp;
334 {
335 struct socket *so;
336
337 if (fp == NULL || fp->f_type != DTYPE_SOCKET)
338 return NULL;
339
340 so = fp->f_data;
341 return so->so_emuldata;
342 }
343
344 static int
345 svr4_soo_close(struct file *fp, struct thread *td)
346 {
347 struct socket *so = fp->f_data;
348
349 /* CHECKUNIT_DIAG(ENXIO);*/
350
351 svr4_delete_socket(td->td_proc, fp);
352 free(so->so_emuldata, M_TEMP);
353 return soo_close(fp, td);
354 }
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