1/*
2 * Copyright (c) 2002 Mark Santcroos <marks@ripe.net>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * Netgraph "device" node
27 *
28 * This node presents a /dev/ngd%d device that interfaces to an other
29 * netgraph node.
30 *
31 * $FreeBSD: head/sys/netgraph/ng_device.c 110234 2003-02-02 13:30:00Z alfred $
32 *
33 */
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/kernel.h>
38#include <sys/mbuf.h>
39#include <sys/uio.h>
40#include <sys/queue.h>
41#include <sys/malloc.h>
42#include <sys/conf.h>
43#include <sys/poll.h>
44#include <sys/ioccom.h>
45
46#include <netgraph/ng_message.h>
47#include <netgraph/netgraph.h>
48
49#include "ng_device.h"
50
51/* turn this on for verbose messages */
52#define NGD_DEBUG
53
54/* Netgraph methods */
55static ng_constructor_t ng_device_cons;
56static ng_rcvmsg_t ng_device_rcvmsg;
57static ng_newhook_t ng_device_newhook;
58static ng_connect_t ng_device_connect;
59static ng_rcvdata_t ng_device_rcvdata;
60static ng_disconnect_t ng_device_disconnect;
61static int ng_device_mod_event(module_t mod, int event, void *data);
62
63static int ng_device_init(void);
64static int get_free_unit(void);
65
66/* Netgraph type */
67static struct ng_type typestruct = {
68 NG_ABI_VERSION, /* version */
69 NG_DEVICE_NODE_TYPE, /* name */
70 ng_device_mod_event, /* modevent */
71 ng_device_cons, /* constructor */
72 ng_device_rcvmsg, /* receive msg */
73 NULL, /* shutdown */
74 ng_device_newhook, /* newhook */
75 NULL, /* findhook */
76 ng_device_connect, /* connect */
77 ng_device_rcvdata, /* receive data */
78 ng_device_disconnect, /* disconnect */
79 NULL
80};
81NETGRAPH_INIT(device, &typestruct);
82
83/* per hook data */
84struct ngd_connection {
85 SLIST_ENTRY(ngd_connection) links;
86
87 dev_t ngddev;
88 struct ng_hook *active_hook;
89 char *readq;
90 int loc;
91 int unit;
92};
93
94/* global data */
95struct ngd_softc {
96 SLIST_HEAD(, ngd_connection) head;
97
98 node_p node;
99 char nodename[NG_NODELEN + 1];
100} ngd_softc;
101
102/* the per connection receiving queue maximum */
103#define NGD_QUEUE_SIZE (1024*10)
104
105/* Maximum number of NGD devices */
106#define MAX_NGD 25 /* should be more than enough for now */
107
108static d_close_t ngdclose;
109static d_open_t ngdopen;
110static d_read_t ngdread;
111static d_write_t ngdwrite;
112static d_ioctl_t ngdioctl;
113static d_poll_t ngdpoll;
114
115#define NGD_CDEV_MAJOR 20
116static struct cdevsw ngd_cdevsw = {
117 /* open */ ngdopen,
118 /* close */ ngdclose,
119 /* read */ ngdread,
120 /* write */ ngdwrite,
121 /* ioctl */ ngdioctl,
122 /* poll */ ngdpoll,
123 /* mmap */ nommap,
124 /* strategy */ nostrategy,
125 /* name */ "ngd",
126 /* maj */ NGD_CDEV_MAJOR,
127 /* dump */ nodump,
128 /* psize */ nopsize,
129 /* flags */ 0,
130};
131
132/*
133 * this holds all the stuff that should be done at load time
134 */
135static int
136ng_device_mod_event(module_t mod, int event, void *data)
137{
138 int error = 0;
139
140#ifdef NGD_DEBUG
141 printf("%s()\n",__func__);
142#endif /* NGD_DEBUG */
143
144 switch (event) {
145 case MOD_LOAD:
146
147 ng_device_init();
148 break;
149
150 case MOD_UNLOAD:
151 /* XXX do we need to do something specific ? */
152 /* ng_device_breakdown */
153 break;
154
155 default:
156 error = EOPNOTSUPP;
157 break;
158 }
159
160 return(error);
161}
162
163
164static int
165ng_device_init()
166{
167 struct ngd_softc *sc = &ngd_softc;
168
169#ifdef NGD_DEBUG
170 printf("%s()\n",__func__);
171#endif /* NGD_DEBUG */
172
173 SLIST_INIT(&sc->head);
174
175 if (ng_make_node_common(&typestruct, &sc->node) != 0) {
176 printf("%s(): ng_make_node_common failed\n",__func__);
177 return(ENXIO);
178 }
179 sprintf(sc->nodename, "%s", NG_DEVICE_NODE_TYPE);
180 if (ng_name_node(sc->node, sc->nodename)) {
181 NG_NODE_UNREF(sc->node); /* make it go away again */
182 printf("%s(): ng_name_node failed\n",__func__);
183 return(ENXIO);
184 }
185 NG_NODE_SET_PRIVATE(sc->node, sc);
186
187 return(0);
188}
189
190/*
191 * don't allow to be created, only the device can do that
192 */
193static int
194ng_device_cons(node_p node)
195{
196
197#ifdef NGD_DEBUG
198 printf("%s()\n",__func__);
199#endif /* NGD_DEBUG */
200
201 return(EINVAL);
202}
203
204/*
205 * Receive control message. We just bounce it back as a reply.
206 */
207static int
208ng_device_rcvmsg(node_p node, item_p item, hook_p lasthook)
209{
210 struct ngd_softc *sc = &ngd_softc;
211 struct ng_mesg *msg;
212 int error = 0;
213 struct ngd_connection * connection = NULL;
214 struct ngd_connection *tmp = NULL;
215
216#ifdef NGD_DEBUG
217 printf("%s()\n",__func__);
218#endif /* NGD_DEBUG */
219
220 NGI_GET_MSG(item, msg);
221
222 SLIST_FOREACH(tmp,&sc->head,links) {
223 if(tmp->active_hook == lasthook) {
224 connection = tmp;
225 }
226 }
227 if(connection == NULL) {
228 printf("%s(): connection is still NULL, no hook found\n",__func__);
229 return(-1);
230 }
231
232 return(error);
233}
234
235static int
236get_free_unit()
237{
238 struct ngd_connection *tmp = NULL;
239 struct ngd_softc *sc = &ngd_softc;
240 int n = 0;
241 int unit = -1;
242
243#ifdef NGD_DEBUG
244 printf("%s()\n",__func__);
245#endif /* NGD_DEBUG */
246
247 /* When there is no list yet, the first device unit is always 0. */
248 if SLIST_EMPTY(&sc->head) {
249 unit = 0;
250 return(unit);
251 }
252
253 /* Just do a brute force loop to find the first free unit that is
254 * smaller than MAX_NGD.
255 * Set MAX_NGD to a large value, doesn't impact performance.
256 */
257 for(n = 0;n<MAX_NGD && unit == -1;n++) {
258 SLIST_FOREACH(tmp,&sc->head,links) {
259
260 if(tmp->unit == n) {
261 unit = -1;
262 break;
263 }
264 unit = n;
265 }
266 }
267
268 return(unit);
269}
270
271/*
272 * incoming hook
273 */
274static int
275ng_device_newhook(node_p node, hook_p hook, const char *name)
276{
277 struct ngd_softc *sc = &ngd_softc;
278 struct ngd_connection * new_connection = NULL;
279
280#ifdef NGD_DEBUG
281 printf("%s()\n",__func__);
282#endif /* NGD_DEBUG */
283
284 new_connection = malloc(sizeof(struct ngd_connection), M_DEVBUF, M_NOWAIT);
285 if(new_connection == NULL) {
286 printf("%s(): ERROR: new_connection == NULL\n",__func__);
287 return(-1);
288 }
289
290 new_connection->unit = get_free_unit();
291 if(new_connection->unit<0) {
292 printf("%s: No free unit found by get_free_unit(), "
293 "increas MAX_NGD\n",__func__);
294 return(-1);
295 }
296 new_connection->ngddev = make_dev(&ngd_cdevsw, new_connection->unit, 0, 0,0600,"ngd%d",new_connection->unit);
297 if(new_connection->ngddev == NULL) {
298 printf("%s(): make_dev failed\n",__func__);
299 return(-1);
300 }
301
302 new_connection->readq = malloc(sizeof(char)*NGD_QUEUE_SIZE, M_DEVBUF, M_NOWAIT | M_ZERO);
303 if(new_connection->readq == NULL) {
304 printf("%s(): readq malloc failed\n",__func__);
305 return(-1);
306 }
307
308 /* point to begin of buffer */
309 new_connection->loc = 0;
310 new_connection->active_hook = hook;
311
312 SLIST_INSERT_HEAD(&sc->head, new_connection, links);
313
314 return(0);
315}
316
317/*
318 * we gave ok to a new hook
319 * now connect
320 */
321static int
322ng_device_connect(hook_p hook)
323{
324
325#ifdef NGD_DEBUG
326 printf("%s()\n",__func__);
327#endif /* NGD_DEBUG */
328
329 return(0);
330}
331
332
333/*
334 * Receive data from hook
335 */
336static int
337ng_device_rcvdata(hook_p hook, item_p item)
338{
339 struct mbuf *m;
340 struct ngd_softc *sc = &ngd_softc;
341 struct ngd_connection * connection = NULL;
342 struct ngd_connection * tmp;
343 char *buffer;
344
345#ifdef NGD_DEBUG
346 printf("%s()\n",__func__);
347#endif /* NGD_DEBUG */
348
349 SLIST_FOREACH(tmp,&sc->head,links) {
350 if(tmp->active_hook == hook) {
351 connection = tmp;
352 }
353 }
354 if(connection == NULL) {
355 printf("%s(): connection is still NULL, no hook found\n",__func__);
356 return(-1);
357 }
358
359 NGI_GET_M(item, m);
360 NG_FREE_ITEM(item);
361
362 m = m_pullup(m,m->m_len);
363 if(m == NULL) {
364 printf("%s(): ERROR: m_pullup failed\n",__func__);
365 return(-1);
366 }
367
368 buffer = malloc(sizeof(char)*m->m_len, M_DEVBUF, M_NOWAIT | M_ZERO);
369 if(buffer == NULL) {
370 printf("%s(): ERROR: buffer malloc failed\n",__func__);
371 return(-1);
372 }
373
374 buffer = mtod(m,char *);
375
376 if( (connection->loc+m->m_len) < NGD_QUEUE_SIZE) {
377 memcpy(connection->readq+connection->loc, buffer, m->m_len);
378 connection->loc += m->m_len;
379 } else
380 printf("%s(): queue full, first read out a bit\n",__func__);
381
382 free(buffer,M_DEVBUF);
383
384 return(0);
385}
386
387/*
388 * Removal of the last link destroys the node
389 */
390static int
391ng_device_disconnect(hook_p hook)
392{
393 struct ngd_softc *sc = &ngd_softc;
394 struct ngd_connection * connection = NULL;
395 struct ngd_connection * tmp;
396
397#ifdef NGD_DEBUG
398 printf("%s()\n",__func__);
399#endif /* NGD_DEBUG */
400
401 SLIST_FOREACH(tmp,&sc->head,links) {
402 if(tmp->active_hook == hook) {
403 connection = tmp;
404 }
405 }
406 if(connection == NULL) {
407 printf("%s(): connection is still NULL, no hook found\n",__func__);
408 return(-1);
409 }
410
411 free(connection->readq,M_DEVBUF);
412
413 destroy_dev(connection->ngddev);
414
415 SLIST_REMOVE(&sc->head,connection,ngd_connection,links);
416
417 return(0);
418}
419/*
420 * the device is opened
421 */
422static int
423ngdopen(dev_t dev, int flag, int mode, struct thread *td)
424{
425
426#ifdef NGD_DEBUG
427 printf("%s()\n",__func__);
428#endif /* NGD_DEBUG */
429
430 return(0);
431}
432
433/*
434 * the device is closed
435 */
436static int
437ngdclose(dev_t dev, int flag, int mode, struct thread *td)
438{
439
440#ifdef NGD_DEBUG
441 printf("%s()\n",__func__);
442#endif
443
444 return(0);
445}
446
447
448/*
449 * process ioctl
450 *
451 * they are translated into netgraph messages and passed on
452 *
453 */
454static int
455ngdioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
456{
457 struct ngd_softc *sc = &ngd_softc;
458 struct ngd_connection * connection = NULL;
459 struct ngd_connection * tmp;
460 int error = 0;
461 struct ng_mesg *msg;
462 struct ngd_param_s * datap;
463
464#ifdef NGD_DEBUG
465 printf("%s()\n",__func__);
466#endif /* NGD_DEBUG */
467
468 SLIST_FOREACH(tmp,&sc->head,links) {
469 if(tmp->ngddev == dev) {
470 connection = tmp;
471 }
472 }
473 if(connection == NULL) {
474 printf("%s(): connection is still NULL, no dev found\n",__func__);
475 return(-1);
476 }
477
478 /* NG_MKMESSAGE(msg, cookie, cmdid, len, how) */
479 NG_MKMESSAGE(msg, NGM_DEVICE_COOKIE, cmd, sizeof(struct ngd_param_s),
480 M_NOWAIT);
481 if (msg == NULL) {
482 printf("%s(): msg == NULL\n",__func__);
483 goto nomsg;
484 }
485
486 /* pass the ioctl data into the ->data area */
487 datap = (struct ngd_param_s *)msg->data;
488 datap->p = addr;
489
490 /* NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) */
491 NG_SEND_MSG_HOOK(error, sc->node, msg, connection->active_hook, NULL);
492 if(error)
493 printf("%s(): NG_SEND_MSG_HOOK error: %d\n",__func__,error);
494
495nomsg:
496
497 return(0);
498}
499
500
501/*
502 * This function is called when a read(2) is done to our device.
503 * We pass the data available in kernelspace on into userland using
504 * uiomove.
505 */
506static int
507ngdread(dev_t dev, struct uio *uio, int flag)
508{
509 int ret = 0, amnt;
510 char buffer[uio->uio_resid+1];
511 struct ngd_softc *sc = &ngd_softc;
512 struct ngd_connection * connection = NULL;
513 struct ngd_connection * tmp;
514
515#ifdef NGD_DEBUG
516 printf("%s()\n",__func__);
517#endif /* NGD_DEBUG */
518
519 SLIST_FOREACH(tmp,&sc->head,links) {
520 if(tmp->ngddev == dev) {
521 connection = tmp;
522 }
523 }
524 if(connection == NULL) {
525 printf("%s(): connection is still NULL, no dev found\n",__func__);
526 return(-1);
527 }
528
529 while ( ( uio->uio_resid > 0 ) && ( connection->loc > 0 ) ) {
530 amnt = MIN(uio->uio_resid,connection->loc);
531
532 memcpy(buffer,connection->readq, amnt);
533 memcpy(connection->readq, connection->readq+amnt,
534 connection->loc-amnt);
535 connection->loc -= amnt;
536
537 ret = uiomove((caddr_t)buffer, amnt, uio);
538 if(ret != 0)
539 goto error;
540
541 }
542 return(0);
543
544error:
545 printf("%s(): uiomove returns error %d\n",__func__,ret);
546 /* do error cleanup here */
547 return(ret);
548}
549
550
551/*
552 * This function is called when our device is written to.
553 * We read the data from userland into our local buffer and pass it on
554 * into the remote hook.
555 *
556 */
557static int
558ngdwrite(dev_t dev, struct uio *uio, int flag)
559{
560 int ret;
561 int error = 0;
562 struct mbuf *m;
563 char buffer[uio->uio_resid];
564 int len = uio->uio_resid;
565 struct ngd_softc *sc =& ngd_softc;
566 struct ngd_connection * connection = NULL;
567 struct ngd_connection * tmp;
568
569#ifdef NGD_DEBUG
570 printf("%s()\n",__func__);
571#endif /* NGD_DEBUG */
572
573 SLIST_FOREACH(tmp,&sc->head,links) {
574 if(tmp->ngddev == dev) {
575 connection = tmp;
576 }
577 }
578
579 if(connection == NULL) {
580 printf("%s(): connection is still NULL, no dev found\n",__func__);
581 return(-1);
582 }
583
584 if (len > 0) {
585 if ((ret = uiomove((caddr_t)buffer, len, uio)) != 0)
586 goto error;
587 } else
588 printf("%s(): len <= 0 : is this supposed to happen?!\n",__func__);
589
590 m = m_devget(buffer,len,0,NULL,NULL);
591
592 NG_SEND_DATA_ONLY(error,connection->active_hook,m);
593
594 return(0);
595
596error:
597 /* do error cleanup here */
598 printf("%s(): uiomove returned err: %d\n",__func__,ret);
599
600 return(ret);
601}
602
603/*
604 * we are being polled/selected
605 * check if there is data available for read
606 */
607static int
608ngdpoll(dev_t dev, int events, struct thread *td)
609{
610 int revents = 0;
611 struct ngd_softc *sc = &ngd_softc;
612 struct ngd_connection * connection = NULL;
613 struct ngd_connection * tmp;
614
615
616 if (events & (POLLIN | POLLRDNORM)) {
617 /* get the connection we have to know the loc from */
618 SLIST_FOREACH(tmp,&sc->head,links) {
619 if(tmp->ngddev == dev) {
620 connection = tmp;
621 }
622 }
623 if(connection == NULL) {
624 printf("%s(): ERROR: connection is still NULL,"
625 "no dev found\n",__func__);
626 return(-1);
627 }
628
629 if (connection->loc > 0)
630 revents |= events & (POLLIN | POLLRDNORM);
631 }
632
633 return(revents);
634}
2 * Copyright (c) 2002 Mark Santcroos <marks@ripe.net>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * Netgraph "device" node
27 *
28 * This node presents a /dev/ngd%d device that interfaces to an other
29 * netgraph node.
30 *
31 * $FreeBSD: head/sys/netgraph/ng_device.c 110234 2003-02-02 13:30:00Z alfred $
32 *
33 */
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/kernel.h>
38#include <sys/mbuf.h>
39#include <sys/uio.h>
40#include <sys/queue.h>
41#include <sys/malloc.h>
42#include <sys/conf.h>
43#include <sys/poll.h>
44#include <sys/ioccom.h>
45
46#include <netgraph/ng_message.h>
47#include <netgraph/netgraph.h>
48
49#include "ng_device.h"
50
51/* turn this on for verbose messages */
52#define NGD_DEBUG
53
54/* Netgraph methods */
55static ng_constructor_t ng_device_cons;
56static ng_rcvmsg_t ng_device_rcvmsg;
57static ng_newhook_t ng_device_newhook;
58static ng_connect_t ng_device_connect;
59static ng_rcvdata_t ng_device_rcvdata;
60static ng_disconnect_t ng_device_disconnect;
61static int ng_device_mod_event(module_t mod, int event, void *data);
62
63static int ng_device_init(void);
64static int get_free_unit(void);
65
66/* Netgraph type */
67static struct ng_type typestruct = {
68 NG_ABI_VERSION, /* version */
69 NG_DEVICE_NODE_TYPE, /* name */
70 ng_device_mod_event, /* modevent */
71 ng_device_cons, /* constructor */
72 ng_device_rcvmsg, /* receive msg */
73 NULL, /* shutdown */
74 ng_device_newhook, /* newhook */
75 NULL, /* findhook */
76 ng_device_connect, /* connect */
77 ng_device_rcvdata, /* receive data */
78 ng_device_disconnect, /* disconnect */
79 NULL
80};
81NETGRAPH_INIT(device, &typestruct);
82
83/* per hook data */
84struct ngd_connection {
85 SLIST_ENTRY(ngd_connection) links;
86
87 dev_t ngddev;
88 struct ng_hook *active_hook;
89 char *readq;
90 int loc;
91 int unit;
92};
93
94/* global data */
95struct ngd_softc {
96 SLIST_HEAD(, ngd_connection) head;
97
98 node_p node;
99 char nodename[NG_NODELEN + 1];
100} ngd_softc;
101
102/* the per connection receiving queue maximum */
103#define NGD_QUEUE_SIZE (1024*10)
104
105/* Maximum number of NGD devices */
106#define MAX_NGD 25 /* should be more than enough for now */
107
108static d_close_t ngdclose;
109static d_open_t ngdopen;
110static d_read_t ngdread;
111static d_write_t ngdwrite;
112static d_ioctl_t ngdioctl;
113static d_poll_t ngdpoll;
114
115#define NGD_CDEV_MAJOR 20
116static struct cdevsw ngd_cdevsw = {
117 /* open */ ngdopen,
118 /* close */ ngdclose,
119 /* read */ ngdread,
120 /* write */ ngdwrite,
121 /* ioctl */ ngdioctl,
122 /* poll */ ngdpoll,
123 /* mmap */ nommap,
124 /* strategy */ nostrategy,
125 /* name */ "ngd",
126 /* maj */ NGD_CDEV_MAJOR,
127 /* dump */ nodump,
128 /* psize */ nopsize,
129 /* flags */ 0,
130};
131
132/*
133 * this holds all the stuff that should be done at load time
134 */
135static int
136ng_device_mod_event(module_t mod, int event, void *data)
137{
138 int error = 0;
139
140#ifdef NGD_DEBUG
141 printf("%s()\n",__func__);
142#endif /* NGD_DEBUG */
143
144 switch (event) {
145 case MOD_LOAD:
146
147 ng_device_init();
148 break;
149
150 case MOD_UNLOAD:
151 /* XXX do we need to do something specific ? */
152 /* ng_device_breakdown */
153 break;
154
155 default:
156 error = EOPNOTSUPP;
157 break;
158 }
159
160 return(error);
161}
162
163
164static int
165ng_device_init()
166{
167 struct ngd_softc *sc = &ngd_softc;
168
169#ifdef NGD_DEBUG
170 printf("%s()\n",__func__);
171#endif /* NGD_DEBUG */
172
173 SLIST_INIT(&sc->head);
174
175 if (ng_make_node_common(&typestruct, &sc->node) != 0) {
176 printf("%s(): ng_make_node_common failed\n",__func__);
177 return(ENXIO);
178 }
179 sprintf(sc->nodename, "%s", NG_DEVICE_NODE_TYPE);
180 if (ng_name_node(sc->node, sc->nodename)) {
181 NG_NODE_UNREF(sc->node); /* make it go away again */
182 printf("%s(): ng_name_node failed\n",__func__);
183 return(ENXIO);
184 }
185 NG_NODE_SET_PRIVATE(sc->node, sc);
186
187 return(0);
188}
189
190/*
191 * don't allow to be created, only the device can do that
192 */
193static int
194ng_device_cons(node_p node)
195{
196
197#ifdef NGD_DEBUG
198 printf("%s()\n",__func__);
199#endif /* NGD_DEBUG */
200
201 return(EINVAL);
202}
203
204/*
205 * Receive control message. We just bounce it back as a reply.
206 */
207static int
208ng_device_rcvmsg(node_p node, item_p item, hook_p lasthook)
209{
210 struct ngd_softc *sc = &ngd_softc;
211 struct ng_mesg *msg;
212 int error = 0;
213 struct ngd_connection * connection = NULL;
214 struct ngd_connection *tmp = NULL;
215
216#ifdef NGD_DEBUG
217 printf("%s()\n",__func__);
218#endif /* NGD_DEBUG */
219
220 NGI_GET_MSG(item, msg);
221
222 SLIST_FOREACH(tmp,&sc->head,links) {
223 if(tmp->active_hook == lasthook) {
224 connection = tmp;
225 }
226 }
227 if(connection == NULL) {
228 printf("%s(): connection is still NULL, no hook found\n",__func__);
229 return(-1);
230 }
231
232 return(error);
233}
234
235static int
236get_free_unit()
237{
238 struct ngd_connection *tmp = NULL;
239 struct ngd_softc *sc = &ngd_softc;
240 int n = 0;
241 int unit = -1;
242
243#ifdef NGD_DEBUG
244 printf("%s()\n",__func__);
245#endif /* NGD_DEBUG */
246
247 /* When there is no list yet, the first device unit is always 0. */
248 if SLIST_EMPTY(&sc->head) {
249 unit = 0;
250 return(unit);
251 }
252
253 /* Just do a brute force loop to find the first free unit that is
254 * smaller than MAX_NGD.
255 * Set MAX_NGD to a large value, doesn't impact performance.
256 */
257 for(n = 0;n<MAX_NGD && unit == -1;n++) {
258 SLIST_FOREACH(tmp,&sc->head,links) {
259
260 if(tmp->unit == n) {
261 unit = -1;
262 break;
263 }
264 unit = n;
265 }
266 }
267
268 return(unit);
269}
270
271/*
272 * incoming hook
273 */
274static int
275ng_device_newhook(node_p node, hook_p hook, const char *name)
276{
277 struct ngd_softc *sc = &ngd_softc;
278 struct ngd_connection * new_connection = NULL;
279
280#ifdef NGD_DEBUG
281 printf("%s()\n",__func__);
282#endif /* NGD_DEBUG */
283
284 new_connection = malloc(sizeof(struct ngd_connection), M_DEVBUF, M_NOWAIT);
285 if(new_connection == NULL) {
286 printf("%s(): ERROR: new_connection == NULL\n",__func__);
287 return(-1);
288 }
289
290 new_connection->unit = get_free_unit();
291 if(new_connection->unit<0) {
292 printf("%s: No free unit found by get_free_unit(), "
293 "increas MAX_NGD\n",__func__);
294 return(-1);
295 }
296 new_connection->ngddev = make_dev(&ngd_cdevsw, new_connection->unit, 0, 0,0600,"ngd%d",new_connection->unit);
297 if(new_connection->ngddev == NULL) {
298 printf("%s(): make_dev failed\n",__func__);
299 return(-1);
300 }
301
302 new_connection->readq = malloc(sizeof(char)*NGD_QUEUE_SIZE, M_DEVBUF, M_NOWAIT | M_ZERO);
303 if(new_connection->readq == NULL) {
304 printf("%s(): readq malloc failed\n",__func__);
305 return(-1);
306 }
307
308 /* point to begin of buffer */
309 new_connection->loc = 0;
310 new_connection->active_hook = hook;
311
312 SLIST_INSERT_HEAD(&sc->head, new_connection, links);
313
314 return(0);
315}
316
317/*
318 * we gave ok to a new hook
319 * now connect
320 */
321static int
322ng_device_connect(hook_p hook)
323{
324
325#ifdef NGD_DEBUG
326 printf("%s()\n",__func__);
327#endif /* NGD_DEBUG */
328
329 return(0);
330}
331
332
333/*
334 * Receive data from hook
335 */
336static int
337ng_device_rcvdata(hook_p hook, item_p item)
338{
339 struct mbuf *m;
340 struct ngd_softc *sc = &ngd_softc;
341 struct ngd_connection * connection = NULL;
342 struct ngd_connection * tmp;
343 char *buffer;
344
345#ifdef NGD_DEBUG
346 printf("%s()\n",__func__);
347#endif /* NGD_DEBUG */
348
349 SLIST_FOREACH(tmp,&sc->head,links) {
350 if(tmp->active_hook == hook) {
351 connection = tmp;
352 }
353 }
354 if(connection == NULL) {
355 printf("%s(): connection is still NULL, no hook found\n",__func__);
356 return(-1);
357 }
358
359 NGI_GET_M(item, m);
360 NG_FREE_ITEM(item);
361
362 m = m_pullup(m,m->m_len);
363 if(m == NULL) {
364 printf("%s(): ERROR: m_pullup failed\n",__func__);
365 return(-1);
366 }
367
368 buffer = malloc(sizeof(char)*m->m_len, M_DEVBUF, M_NOWAIT | M_ZERO);
369 if(buffer == NULL) {
370 printf("%s(): ERROR: buffer malloc failed\n",__func__);
371 return(-1);
372 }
373
374 buffer = mtod(m,char *);
375
376 if( (connection->loc+m->m_len) < NGD_QUEUE_SIZE) {
377 memcpy(connection->readq+connection->loc, buffer, m->m_len);
378 connection->loc += m->m_len;
379 } else
380 printf("%s(): queue full, first read out a bit\n",__func__);
381
382 free(buffer,M_DEVBUF);
383
384 return(0);
385}
386
387/*
388 * Removal of the last link destroys the node
389 */
390static int
391ng_device_disconnect(hook_p hook)
392{
393 struct ngd_softc *sc = &ngd_softc;
394 struct ngd_connection * connection = NULL;
395 struct ngd_connection * tmp;
396
397#ifdef NGD_DEBUG
398 printf("%s()\n",__func__);
399#endif /* NGD_DEBUG */
400
401 SLIST_FOREACH(tmp,&sc->head,links) {
402 if(tmp->active_hook == hook) {
403 connection = tmp;
404 }
405 }
406 if(connection == NULL) {
407 printf("%s(): connection is still NULL, no hook found\n",__func__);
408 return(-1);
409 }
410
411 free(connection->readq,M_DEVBUF);
412
413 destroy_dev(connection->ngddev);
414
415 SLIST_REMOVE(&sc->head,connection,ngd_connection,links);
416
417 return(0);
418}
419/*
420 * the device is opened
421 */
422static int
423ngdopen(dev_t dev, int flag, int mode, struct thread *td)
424{
425
426#ifdef NGD_DEBUG
427 printf("%s()\n",__func__);
428#endif /* NGD_DEBUG */
429
430 return(0);
431}
432
433/*
434 * the device is closed
435 */
436static int
437ngdclose(dev_t dev, int flag, int mode, struct thread *td)
438{
439
440#ifdef NGD_DEBUG
441 printf("%s()\n",__func__);
442#endif
443
444 return(0);
445}
446
447
448/*
449 * process ioctl
450 *
451 * they are translated into netgraph messages and passed on
452 *
453 */
454static int
455ngdioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
456{
457 struct ngd_softc *sc = &ngd_softc;
458 struct ngd_connection * connection = NULL;
459 struct ngd_connection * tmp;
460 int error = 0;
461 struct ng_mesg *msg;
462 struct ngd_param_s * datap;
463
464#ifdef NGD_DEBUG
465 printf("%s()\n",__func__);
466#endif /* NGD_DEBUG */
467
468 SLIST_FOREACH(tmp,&sc->head,links) {
469 if(tmp->ngddev == dev) {
470 connection = tmp;
471 }
472 }
473 if(connection == NULL) {
474 printf("%s(): connection is still NULL, no dev found\n",__func__);
475 return(-1);
476 }
477
478 /* NG_MKMESSAGE(msg, cookie, cmdid, len, how) */
479 NG_MKMESSAGE(msg, NGM_DEVICE_COOKIE, cmd, sizeof(struct ngd_param_s),
480 M_NOWAIT);
481 if (msg == NULL) {
482 printf("%s(): msg == NULL\n",__func__);
483 goto nomsg;
484 }
485
486 /* pass the ioctl data into the ->data area */
487 datap = (struct ngd_param_s *)msg->data;
488 datap->p = addr;
489
490 /* NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) */
491 NG_SEND_MSG_HOOK(error, sc->node, msg, connection->active_hook, NULL);
492 if(error)
493 printf("%s(): NG_SEND_MSG_HOOK error: %d\n",__func__,error);
494
495nomsg:
496
497 return(0);
498}
499
500
501/*
502 * This function is called when a read(2) is done to our device.
503 * We pass the data available in kernelspace on into userland using
504 * uiomove.
505 */
506static int
507ngdread(dev_t dev, struct uio *uio, int flag)
508{
509 int ret = 0, amnt;
510 char buffer[uio->uio_resid+1];
511 struct ngd_softc *sc = &ngd_softc;
512 struct ngd_connection * connection = NULL;
513 struct ngd_connection * tmp;
514
515#ifdef NGD_DEBUG
516 printf("%s()\n",__func__);
517#endif /* NGD_DEBUG */
518
519 SLIST_FOREACH(tmp,&sc->head,links) {
520 if(tmp->ngddev == dev) {
521 connection = tmp;
522 }
523 }
524 if(connection == NULL) {
525 printf("%s(): connection is still NULL, no dev found\n",__func__);
526 return(-1);
527 }
528
529 while ( ( uio->uio_resid > 0 ) && ( connection->loc > 0 ) ) {
530 amnt = MIN(uio->uio_resid,connection->loc);
531
532 memcpy(buffer,connection->readq, amnt);
533 memcpy(connection->readq, connection->readq+amnt,
534 connection->loc-amnt);
535 connection->loc -= amnt;
536
537 ret = uiomove((caddr_t)buffer, amnt, uio);
538 if(ret != 0)
539 goto error;
540
541 }
542 return(0);
543
544error:
545 printf("%s(): uiomove returns error %d\n",__func__,ret);
546 /* do error cleanup here */
547 return(ret);
548}
549
550
551/*
552 * This function is called when our device is written to.
553 * We read the data from userland into our local buffer and pass it on
554 * into the remote hook.
555 *
556 */
557static int
558ngdwrite(dev_t dev, struct uio *uio, int flag)
559{
560 int ret;
561 int error = 0;
562 struct mbuf *m;
563 char buffer[uio->uio_resid];
564 int len = uio->uio_resid;
565 struct ngd_softc *sc =& ngd_softc;
566 struct ngd_connection * connection = NULL;
567 struct ngd_connection * tmp;
568
569#ifdef NGD_DEBUG
570 printf("%s()\n",__func__);
571#endif /* NGD_DEBUG */
572
573 SLIST_FOREACH(tmp,&sc->head,links) {
574 if(tmp->ngddev == dev) {
575 connection = tmp;
576 }
577 }
578
579 if(connection == NULL) {
580 printf("%s(): connection is still NULL, no dev found\n",__func__);
581 return(-1);
582 }
583
584 if (len > 0) {
585 if ((ret = uiomove((caddr_t)buffer, len, uio)) != 0)
586 goto error;
587 } else
588 printf("%s(): len <= 0 : is this supposed to happen?!\n",__func__);
589
590 m = m_devget(buffer,len,0,NULL,NULL);
591
592 NG_SEND_DATA_ONLY(error,connection->active_hook,m);
593
594 return(0);
595
596error:
597 /* do error cleanup here */
598 printf("%s(): uiomove returned err: %d\n",__func__,ret);
599
600 return(ret);
601}
602
603/*
604 * we are being polled/selected
605 * check if there is data available for read
606 */
607static int
608ngdpoll(dev_t dev, int events, struct thread *td)
609{
610 int revents = 0;
611 struct ngd_softc *sc = &ngd_softc;
612 struct ngd_connection * connection = NULL;
613 struct ngd_connection * tmp;
614
615
616 if (events & (POLLIN | POLLRDNORM)) {
617 /* get the connection we have to know the loc from */
618 SLIST_FOREACH(tmp,&sc->head,links) {
619 if(tmp->ngddev == dev) {
620 connection = tmp;
621 }
622 }
623 if(connection == NULL) {
624 printf("%s(): ERROR: connection is still NULL,"
625 "no dev found\n",__func__);
626 return(-1);
627 }
628
629 if (connection->loc > 0)
630 revents |= events & (POLLIN | POLLRDNORM);
631 }
632
633 return(revents);
634}