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 111815 2003-03-03 12:15:54Z phk $
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 .d_open = ngdopen,
118 .d_close = ngdclose,
119 .d_read = ngdread,
120 .d_write = ngdwrite,
121 .d_ioctl = ngdioctl,
122 .d_poll = ngdpoll,
123 .d_name = "ngd",
124 .d_maj = NGD_CDEV_MAJOR,
125};
126
127/*
128 * this holds all the stuff that should be done at load time
129 */
130static int
131ng_device_mod_event(module_t mod, int event, void *data)
132{
133 int error = 0;
134
135#ifdef NGD_DEBUG
136 printf("%s()\n",__func__);
137#endif /* NGD_DEBUG */
138
139 switch (event) {
140 case MOD_LOAD:
141
142 ng_device_init();
143 break;
144
145 case MOD_UNLOAD:
146 /* XXX do we need to do something specific ? */
147 /* ng_device_breakdown */
148 break;
149
150 default:
151 error = EOPNOTSUPP;
152 break;
153 }
154
155 return(error);
156}
157
158
159static int
160ng_device_init()
161{
162 struct ngd_softc *sc = &ngd_softc;
163
164#ifdef NGD_DEBUG
165 printf("%s()\n",__func__);
166#endif /* NGD_DEBUG */
167
168 SLIST_INIT(&sc->head);
169
170 if (ng_make_node_common(&typestruct, &sc->node) != 0) {
171 printf("%s(): ng_make_node_common failed\n",__func__);
172 return(ENXIO);
173 }
174 sprintf(sc->nodename, "%s", NG_DEVICE_NODE_TYPE);
175 if (ng_name_node(sc->node, sc->nodename)) {
176 NG_NODE_UNREF(sc->node); /* make it go away again */
177 printf("%s(): ng_name_node failed\n",__func__);
178 return(ENXIO);
179 }
180 NG_NODE_SET_PRIVATE(sc->node, sc);
181
182 return(0);
183}
184
185/*
186 * don't allow to be created, only the device can do that
187 */
188static int
189ng_device_cons(node_p node)
190{
191
192#ifdef NGD_DEBUG
193 printf("%s()\n",__func__);
194#endif /* NGD_DEBUG */
195
196 return(EINVAL);
197}
198
199/*
200 * Receive control message. We just bounce it back as a reply.
201 */
202static int
203ng_device_rcvmsg(node_p node, item_p item, hook_p lasthook)
204{
205 struct ngd_softc *sc = &ngd_softc;
206 struct ng_mesg *msg;
207 int error = 0;
208 struct ngd_connection * connection = NULL;
209 struct ngd_connection *tmp = NULL;
210
211#ifdef NGD_DEBUG
212 printf("%s()\n",__func__);
213#endif /* NGD_DEBUG */
214
215 NGI_GET_MSG(item, msg);
216
217 SLIST_FOREACH(tmp,&sc->head,links) {
218 if(tmp->active_hook == lasthook) {
219 connection = tmp;
220 }
221 }
222 if(connection == NULL) {
223 printf("%s(): connection is still NULL, no hook found\n",__func__);
224 return(-1);
225 }
226
227 return(error);
228}
229
230static int
231get_free_unit()
232{
233 struct ngd_connection *tmp = NULL;
234 struct ngd_softc *sc = &ngd_softc;
235 int n = 0;
236 int unit = -1;
237
238#ifdef NGD_DEBUG
239 printf("%s()\n",__func__);
240#endif /* NGD_DEBUG */
241
242 /* When there is no list yet, the first device unit is always 0. */
243 if SLIST_EMPTY(&sc->head) {
244 unit = 0;
245 return(unit);
246 }
247
248 /* Just do a brute force loop to find the first free unit that is
249 * smaller than MAX_NGD.
250 * Set MAX_NGD to a large value, doesn't impact performance.
251 */
252 for(n = 0;n<MAX_NGD && unit == -1;n++) {
253 SLIST_FOREACH(tmp,&sc->head,links) {
254
255 if(tmp->unit == n) {
256 unit = -1;
257 break;
258 }
259 unit = n;
260 }
261 }
262
263 return(unit);
264}
265
266/*
267 * incoming hook
268 */
269static int
270ng_device_newhook(node_p node, hook_p hook, const char *name)
271{
272 struct ngd_softc *sc = &ngd_softc;
273 struct ngd_connection * new_connection = NULL;
274
275#ifdef NGD_DEBUG
276 printf("%s()\n",__func__);
277#endif /* NGD_DEBUG */
278
279 new_connection = malloc(sizeof(struct ngd_connection), M_DEVBUF, M_NOWAIT);
280 if(new_connection == NULL) {
281 printf("%s(): ERROR: new_connection == NULL\n",__func__);
282 return(-1);
283 }
284
285 new_connection->unit = get_free_unit();
286 if(new_connection->unit<0) {
287 printf("%s: No free unit found by get_free_unit(), "
288 "increas MAX_NGD\n",__func__);
289 return(-1);
290 }
291 new_connection->ngddev = make_dev(&ngd_cdevsw, new_connection->unit, 0, 0,0600,"ngd%d",new_connection->unit);
292 if(new_connection->ngddev == NULL) {
293 printf("%s(): make_dev failed\n",__func__);
294 return(-1);
295 }
296
297 new_connection->readq = malloc(sizeof(char)*NGD_QUEUE_SIZE, M_DEVBUF, M_NOWAIT | M_ZERO);
298 if(new_connection->readq == NULL) {
299 printf("%s(): readq malloc failed\n",__func__);
300 return(-1);
301 }
302
303 /* point to begin of buffer */
304 new_connection->loc = 0;
305 new_connection->active_hook = hook;
306
307 SLIST_INSERT_HEAD(&sc->head, new_connection, links);
308
309 return(0);
310}
311
312/*
313 * we gave ok to a new hook
314 * now connect
315 */
316static int
317ng_device_connect(hook_p hook)
318{
319
320#ifdef NGD_DEBUG
321 printf("%s()\n",__func__);
322#endif /* NGD_DEBUG */
323
324 return(0);
325}
326
327
328/*
329 * Receive data from hook
330 */
331static int
332ng_device_rcvdata(hook_p hook, item_p item)
333{
334 struct mbuf *m;
335 struct ngd_softc *sc = &ngd_softc;
336 struct ngd_connection * connection = NULL;
337 struct ngd_connection * tmp;
338 char *buffer;
339
340#ifdef NGD_DEBUG
341 printf("%s()\n",__func__);
342#endif /* NGD_DEBUG */
343
344 SLIST_FOREACH(tmp,&sc->head,links) {
345 if(tmp->active_hook == hook) {
346 connection = tmp;
347 }
348 }
349 if(connection == NULL) {
350 printf("%s(): connection is still NULL, no hook found\n",__func__);
351 return(-1);
352 }
353
354 NGI_GET_M(item, m);
355 NG_FREE_ITEM(item);
356
357 m = m_pullup(m,m->m_len);
358 if(m == NULL) {
359 printf("%s(): ERROR: m_pullup failed\n",__func__);
360 return(-1);
361 }
362
363 buffer = malloc(sizeof(char)*m->m_len, M_DEVBUF, M_NOWAIT | M_ZERO);
364 if(buffer == NULL) {
365 printf("%s(): ERROR: buffer malloc failed\n",__func__);
366 return(-1);
367 }
368
369 buffer = mtod(m,char *);
370
371 if( (connection->loc+m->m_len) < NGD_QUEUE_SIZE) {
372 memcpy(connection->readq+connection->loc, buffer, m->m_len);
373 connection->loc += m->m_len;
374 } else
375 printf("%s(): queue full, first read out a bit\n",__func__);
376
377 free(buffer,M_DEVBUF);
378
379 return(0);
380}
381
382/*
383 * Removal of the last link destroys the node
384 */
385static int
386ng_device_disconnect(hook_p hook)
387{
388 struct ngd_softc *sc = &ngd_softc;
389 struct ngd_connection * connection = NULL;
390 struct ngd_connection * tmp;
391
392#ifdef NGD_DEBUG
393 printf("%s()\n",__func__);
394#endif /* NGD_DEBUG */
395
396 SLIST_FOREACH(tmp,&sc->head,links) {
397 if(tmp->active_hook == hook) {
398 connection = tmp;
399 }
400 }
401 if(connection == NULL) {
402 printf("%s(): connection is still NULL, no hook found\n",__func__);
403 return(-1);
404 }
405
406 free(connection->readq,M_DEVBUF);
407
408 destroy_dev(connection->ngddev);
409
410 SLIST_REMOVE(&sc->head,connection,ngd_connection,links);
411
412 return(0);
413}
414/*
415 * the device is opened
416 */
417static int
418ngdopen(dev_t dev, int flag, int mode, struct thread *td)
419{
420
421#ifdef NGD_DEBUG
422 printf("%s()\n",__func__);
423#endif /* NGD_DEBUG */
424
425 return(0);
426}
427
428/*
429 * the device is closed
430 */
431static int
432ngdclose(dev_t dev, int flag, int mode, struct thread *td)
433{
434
435#ifdef NGD_DEBUG
436 printf("%s()\n",__func__);
437#endif
438
439 return(0);
440}
441
442
443/*
444 * process ioctl
445 *
446 * they are translated into netgraph messages and passed on
447 *
448 */
449static int
450ngdioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
451{
452 struct ngd_softc *sc = &ngd_softc;
453 struct ngd_connection * connection = NULL;
454 struct ngd_connection * tmp;
455 int error = 0;
456 struct ng_mesg *msg;
457 struct ngd_param_s * datap;
458
459#ifdef NGD_DEBUG
460 printf("%s()\n",__func__);
461#endif /* NGD_DEBUG */
462
463 SLIST_FOREACH(tmp,&sc->head,links) {
464 if(tmp->ngddev == dev) {
465 connection = tmp;
466 }
467 }
468 if(connection == NULL) {
469 printf("%s(): connection is still NULL, no dev found\n",__func__);
470 return(-1);
471 }
472
473 /* NG_MKMESSAGE(msg, cookie, cmdid, len, how) */
474 NG_MKMESSAGE(msg, NGM_DEVICE_COOKIE, cmd, sizeof(struct ngd_param_s),
475 M_NOWAIT);
476 if (msg == NULL) {
477 printf("%s(): msg == NULL\n",__func__);
478 goto nomsg;
479 }
480
481 /* pass the ioctl data into the ->data area */
482 datap = (struct ngd_param_s *)msg->data;
483 datap->p = addr;
484
485 /* NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) */
486 NG_SEND_MSG_HOOK(error, sc->node, msg, connection->active_hook, NULL);
487 if(error)
488 printf("%s(): NG_SEND_MSG_HOOK error: %d\n",__func__,error);
489
490nomsg:
491
492 return(0);
493}
494
495
496/*
497 * This function is called when a read(2) is done to our device.
498 * We pass the data available in kernelspace on into userland using
499 * uiomove.
500 */
501static int
502ngdread(dev_t dev, struct uio *uio, int flag)
503{
504 int ret = 0, amnt;
505 char buffer[uio->uio_resid+1];
506 struct ngd_softc *sc = &ngd_softc;
507 struct ngd_connection * connection = NULL;
508 struct ngd_connection * tmp;
509
510#ifdef NGD_DEBUG
511 printf("%s()\n",__func__);
512#endif /* NGD_DEBUG */
513
514 SLIST_FOREACH(tmp,&sc->head,links) {
515 if(tmp->ngddev == dev) {
516 connection = tmp;
517 }
518 }
519 if(connection == NULL) {
520 printf("%s(): connection is still NULL, no dev found\n",__func__);
521 return(-1);
522 }
523
524 while ( ( uio->uio_resid > 0 ) && ( connection->loc > 0 ) ) {
525 amnt = MIN(uio->uio_resid,connection->loc);
526
527 memcpy(buffer,connection->readq, amnt);
528 memcpy(connection->readq, connection->readq+amnt,
529 connection->loc-amnt);
530 connection->loc -= amnt;
531
532 ret = uiomove((caddr_t)buffer, amnt, uio);
533 if(ret != 0)
534 goto error;
535
536 }
537 return(0);
538
539error:
540 printf("%s(): uiomove returns error %d\n",__func__,ret);
541 /* do error cleanup here */
542 return(ret);
543}
544
545
546/*
547 * This function is called when our device is written to.
548 * We read the data from userland into our local buffer and pass it on
549 * into the remote hook.
550 *
551 */
552static int
553ngdwrite(dev_t dev, struct uio *uio, int flag)
554{
555 int ret;
556 int error = 0;
557 struct mbuf *m;
558 char buffer[uio->uio_resid];
559 int len = uio->uio_resid;
560 struct ngd_softc *sc =& ngd_softc;
561 struct ngd_connection * connection = NULL;
562 struct ngd_connection * tmp;
563
564#ifdef NGD_DEBUG
565 printf("%s()\n",__func__);
566#endif /* NGD_DEBUG */
567
568 SLIST_FOREACH(tmp,&sc->head,links) {
569 if(tmp->ngddev == dev) {
570 connection = tmp;
571 }
572 }
573
574 if(connection == NULL) {
575 printf("%s(): connection is still NULL, no dev found\n",__func__);
576 return(-1);
577 }
578
579 if (len > 0) {
580 if ((ret = uiomove((caddr_t)buffer, len, uio)) != 0)
581 goto error;
582 } else
583 printf("%s(): len <= 0 : is this supposed to happen?!\n",__func__);
584
585 m = m_devget(buffer,len,0,NULL,NULL);
586
587 NG_SEND_DATA_ONLY(error,connection->active_hook,m);
588
589 return(0);
590
591error:
592 /* do error cleanup here */
593 printf("%s(): uiomove returned err: %d\n",__func__,ret);
594
595 return(ret);
596}
597
598/*
599 * we are being polled/selected
600 * check if there is data available for read
601 */
602static int
603ngdpoll(dev_t dev, int events, struct thread *td)
604{
605 int revents = 0;
606 struct ngd_softc *sc = &ngd_softc;
607 struct ngd_connection * connection = NULL;
608 struct ngd_connection * tmp;
609
610
611 if (events & (POLLIN | POLLRDNORM)) {
612 /* get the connection we have to know the loc from */
613 SLIST_FOREACH(tmp,&sc->head,links) {
614 if(tmp->ngddev == dev) {
615 connection = tmp;
616 }
617 }
618 if(connection == NULL) {
619 printf("%s(): ERROR: connection is still NULL,"
620 "no dev found\n",__func__);
621 return(-1);
622 }
623
624 if (connection->loc > 0)
625 revents |= events & (POLLIN | POLLRDNORM);
626 }
627
628 return(revents);
629}
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 111815 2003-03-03 12:15:54Z phk $
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 .d_open = ngdopen,
118 .d_close = ngdclose,
119 .d_read = ngdread,
120 .d_write = ngdwrite,
121 .d_ioctl = ngdioctl,
122 .d_poll = ngdpoll,
123 .d_name = "ngd",
124 .d_maj = NGD_CDEV_MAJOR,
125};
126
127/*
128 * this holds all the stuff that should be done at load time
129 */
130static int
131ng_device_mod_event(module_t mod, int event, void *data)
132{
133 int error = 0;
134
135#ifdef NGD_DEBUG
136 printf("%s()\n",__func__);
137#endif /* NGD_DEBUG */
138
139 switch (event) {
140 case MOD_LOAD:
141
142 ng_device_init();
143 break;
144
145 case MOD_UNLOAD:
146 /* XXX do we need to do something specific ? */
147 /* ng_device_breakdown */
148 break;
149
150 default:
151 error = EOPNOTSUPP;
152 break;
153 }
154
155 return(error);
156}
157
158
159static int
160ng_device_init()
161{
162 struct ngd_softc *sc = &ngd_softc;
163
164#ifdef NGD_DEBUG
165 printf("%s()\n",__func__);
166#endif /* NGD_DEBUG */
167
168 SLIST_INIT(&sc->head);
169
170 if (ng_make_node_common(&typestruct, &sc->node) != 0) {
171 printf("%s(): ng_make_node_common failed\n",__func__);
172 return(ENXIO);
173 }
174 sprintf(sc->nodename, "%s", NG_DEVICE_NODE_TYPE);
175 if (ng_name_node(sc->node, sc->nodename)) {
176 NG_NODE_UNREF(sc->node); /* make it go away again */
177 printf("%s(): ng_name_node failed\n",__func__);
178 return(ENXIO);
179 }
180 NG_NODE_SET_PRIVATE(sc->node, sc);
181
182 return(0);
183}
184
185/*
186 * don't allow to be created, only the device can do that
187 */
188static int
189ng_device_cons(node_p node)
190{
191
192#ifdef NGD_DEBUG
193 printf("%s()\n",__func__);
194#endif /* NGD_DEBUG */
195
196 return(EINVAL);
197}
198
199/*
200 * Receive control message. We just bounce it back as a reply.
201 */
202static int
203ng_device_rcvmsg(node_p node, item_p item, hook_p lasthook)
204{
205 struct ngd_softc *sc = &ngd_softc;
206 struct ng_mesg *msg;
207 int error = 0;
208 struct ngd_connection * connection = NULL;
209 struct ngd_connection *tmp = NULL;
210
211#ifdef NGD_DEBUG
212 printf("%s()\n",__func__);
213#endif /* NGD_DEBUG */
214
215 NGI_GET_MSG(item, msg);
216
217 SLIST_FOREACH(tmp,&sc->head,links) {
218 if(tmp->active_hook == lasthook) {
219 connection = tmp;
220 }
221 }
222 if(connection == NULL) {
223 printf("%s(): connection is still NULL, no hook found\n",__func__);
224 return(-1);
225 }
226
227 return(error);
228}
229
230static int
231get_free_unit()
232{
233 struct ngd_connection *tmp = NULL;
234 struct ngd_softc *sc = &ngd_softc;
235 int n = 0;
236 int unit = -1;
237
238#ifdef NGD_DEBUG
239 printf("%s()\n",__func__);
240#endif /* NGD_DEBUG */
241
242 /* When there is no list yet, the first device unit is always 0. */
243 if SLIST_EMPTY(&sc->head) {
244 unit = 0;
245 return(unit);
246 }
247
248 /* Just do a brute force loop to find the first free unit that is
249 * smaller than MAX_NGD.
250 * Set MAX_NGD to a large value, doesn't impact performance.
251 */
252 for(n = 0;n<MAX_NGD && unit == -1;n++) {
253 SLIST_FOREACH(tmp,&sc->head,links) {
254
255 if(tmp->unit == n) {
256 unit = -1;
257 break;
258 }
259 unit = n;
260 }
261 }
262
263 return(unit);
264}
265
266/*
267 * incoming hook
268 */
269static int
270ng_device_newhook(node_p node, hook_p hook, const char *name)
271{
272 struct ngd_softc *sc = &ngd_softc;
273 struct ngd_connection * new_connection = NULL;
274
275#ifdef NGD_DEBUG
276 printf("%s()\n",__func__);
277#endif /* NGD_DEBUG */
278
279 new_connection = malloc(sizeof(struct ngd_connection), M_DEVBUF, M_NOWAIT);
280 if(new_connection == NULL) {
281 printf("%s(): ERROR: new_connection == NULL\n",__func__);
282 return(-1);
283 }
284
285 new_connection->unit = get_free_unit();
286 if(new_connection->unit<0) {
287 printf("%s: No free unit found by get_free_unit(), "
288 "increas MAX_NGD\n",__func__);
289 return(-1);
290 }
291 new_connection->ngddev = make_dev(&ngd_cdevsw, new_connection->unit, 0, 0,0600,"ngd%d",new_connection->unit);
292 if(new_connection->ngddev == NULL) {
293 printf("%s(): make_dev failed\n",__func__);
294 return(-1);
295 }
296
297 new_connection->readq = malloc(sizeof(char)*NGD_QUEUE_SIZE, M_DEVBUF, M_NOWAIT | M_ZERO);
298 if(new_connection->readq == NULL) {
299 printf("%s(): readq malloc failed\n",__func__);
300 return(-1);
301 }
302
303 /* point to begin of buffer */
304 new_connection->loc = 0;
305 new_connection->active_hook = hook;
306
307 SLIST_INSERT_HEAD(&sc->head, new_connection, links);
308
309 return(0);
310}
311
312/*
313 * we gave ok to a new hook
314 * now connect
315 */
316static int
317ng_device_connect(hook_p hook)
318{
319
320#ifdef NGD_DEBUG
321 printf("%s()\n",__func__);
322#endif /* NGD_DEBUG */
323
324 return(0);
325}
326
327
328/*
329 * Receive data from hook
330 */
331static int
332ng_device_rcvdata(hook_p hook, item_p item)
333{
334 struct mbuf *m;
335 struct ngd_softc *sc = &ngd_softc;
336 struct ngd_connection * connection = NULL;
337 struct ngd_connection * tmp;
338 char *buffer;
339
340#ifdef NGD_DEBUG
341 printf("%s()\n",__func__);
342#endif /* NGD_DEBUG */
343
344 SLIST_FOREACH(tmp,&sc->head,links) {
345 if(tmp->active_hook == hook) {
346 connection = tmp;
347 }
348 }
349 if(connection == NULL) {
350 printf("%s(): connection is still NULL, no hook found\n",__func__);
351 return(-1);
352 }
353
354 NGI_GET_M(item, m);
355 NG_FREE_ITEM(item);
356
357 m = m_pullup(m,m->m_len);
358 if(m == NULL) {
359 printf("%s(): ERROR: m_pullup failed\n",__func__);
360 return(-1);
361 }
362
363 buffer = malloc(sizeof(char)*m->m_len, M_DEVBUF, M_NOWAIT | M_ZERO);
364 if(buffer == NULL) {
365 printf("%s(): ERROR: buffer malloc failed\n",__func__);
366 return(-1);
367 }
368
369 buffer = mtod(m,char *);
370
371 if( (connection->loc+m->m_len) < NGD_QUEUE_SIZE) {
372 memcpy(connection->readq+connection->loc, buffer, m->m_len);
373 connection->loc += m->m_len;
374 } else
375 printf("%s(): queue full, first read out a bit\n",__func__);
376
377 free(buffer,M_DEVBUF);
378
379 return(0);
380}
381
382/*
383 * Removal of the last link destroys the node
384 */
385static int
386ng_device_disconnect(hook_p hook)
387{
388 struct ngd_softc *sc = &ngd_softc;
389 struct ngd_connection * connection = NULL;
390 struct ngd_connection * tmp;
391
392#ifdef NGD_DEBUG
393 printf("%s()\n",__func__);
394#endif /* NGD_DEBUG */
395
396 SLIST_FOREACH(tmp,&sc->head,links) {
397 if(tmp->active_hook == hook) {
398 connection = tmp;
399 }
400 }
401 if(connection == NULL) {
402 printf("%s(): connection is still NULL, no hook found\n",__func__);
403 return(-1);
404 }
405
406 free(connection->readq,M_DEVBUF);
407
408 destroy_dev(connection->ngddev);
409
410 SLIST_REMOVE(&sc->head,connection,ngd_connection,links);
411
412 return(0);
413}
414/*
415 * the device is opened
416 */
417static int
418ngdopen(dev_t dev, int flag, int mode, struct thread *td)
419{
420
421#ifdef NGD_DEBUG
422 printf("%s()\n",__func__);
423#endif /* NGD_DEBUG */
424
425 return(0);
426}
427
428/*
429 * the device is closed
430 */
431static int
432ngdclose(dev_t dev, int flag, int mode, struct thread *td)
433{
434
435#ifdef NGD_DEBUG
436 printf("%s()\n",__func__);
437#endif
438
439 return(0);
440}
441
442
443/*
444 * process ioctl
445 *
446 * they are translated into netgraph messages and passed on
447 *
448 */
449static int
450ngdioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
451{
452 struct ngd_softc *sc = &ngd_softc;
453 struct ngd_connection * connection = NULL;
454 struct ngd_connection * tmp;
455 int error = 0;
456 struct ng_mesg *msg;
457 struct ngd_param_s * datap;
458
459#ifdef NGD_DEBUG
460 printf("%s()\n",__func__);
461#endif /* NGD_DEBUG */
462
463 SLIST_FOREACH(tmp,&sc->head,links) {
464 if(tmp->ngddev == dev) {
465 connection = tmp;
466 }
467 }
468 if(connection == NULL) {
469 printf("%s(): connection is still NULL, no dev found\n",__func__);
470 return(-1);
471 }
472
473 /* NG_MKMESSAGE(msg, cookie, cmdid, len, how) */
474 NG_MKMESSAGE(msg, NGM_DEVICE_COOKIE, cmd, sizeof(struct ngd_param_s),
475 M_NOWAIT);
476 if (msg == NULL) {
477 printf("%s(): msg == NULL\n",__func__);
478 goto nomsg;
479 }
480
481 /* pass the ioctl data into the ->data area */
482 datap = (struct ngd_param_s *)msg->data;
483 datap->p = addr;
484
485 /* NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) */
486 NG_SEND_MSG_HOOK(error, sc->node, msg, connection->active_hook, NULL);
487 if(error)
488 printf("%s(): NG_SEND_MSG_HOOK error: %d\n",__func__,error);
489
490nomsg:
491
492 return(0);
493}
494
495
496/*
497 * This function is called when a read(2) is done to our device.
498 * We pass the data available in kernelspace on into userland using
499 * uiomove.
500 */
501static int
502ngdread(dev_t dev, struct uio *uio, int flag)
503{
504 int ret = 0, amnt;
505 char buffer[uio->uio_resid+1];
506 struct ngd_softc *sc = &ngd_softc;
507 struct ngd_connection * connection = NULL;
508 struct ngd_connection * tmp;
509
510#ifdef NGD_DEBUG
511 printf("%s()\n",__func__);
512#endif /* NGD_DEBUG */
513
514 SLIST_FOREACH(tmp,&sc->head,links) {
515 if(tmp->ngddev == dev) {
516 connection = tmp;
517 }
518 }
519 if(connection == NULL) {
520 printf("%s(): connection is still NULL, no dev found\n",__func__);
521 return(-1);
522 }
523
524 while ( ( uio->uio_resid > 0 ) && ( connection->loc > 0 ) ) {
525 amnt = MIN(uio->uio_resid,connection->loc);
526
527 memcpy(buffer,connection->readq, amnt);
528 memcpy(connection->readq, connection->readq+amnt,
529 connection->loc-amnt);
530 connection->loc -= amnt;
531
532 ret = uiomove((caddr_t)buffer, amnt, uio);
533 if(ret != 0)
534 goto error;
535
536 }
537 return(0);
538
539error:
540 printf("%s(): uiomove returns error %d\n",__func__,ret);
541 /* do error cleanup here */
542 return(ret);
543}
544
545
546/*
547 * This function is called when our device is written to.
548 * We read the data from userland into our local buffer and pass it on
549 * into the remote hook.
550 *
551 */
552static int
553ngdwrite(dev_t dev, struct uio *uio, int flag)
554{
555 int ret;
556 int error = 0;
557 struct mbuf *m;
558 char buffer[uio->uio_resid];
559 int len = uio->uio_resid;
560 struct ngd_softc *sc =& ngd_softc;
561 struct ngd_connection * connection = NULL;
562 struct ngd_connection * tmp;
563
564#ifdef NGD_DEBUG
565 printf("%s()\n",__func__);
566#endif /* NGD_DEBUG */
567
568 SLIST_FOREACH(tmp,&sc->head,links) {
569 if(tmp->ngddev == dev) {
570 connection = tmp;
571 }
572 }
573
574 if(connection == NULL) {
575 printf("%s(): connection is still NULL, no dev found\n",__func__);
576 return(-1);
577 }
578
579 if (len > 0) {
580 if ((ret = uiomove((caddr_t)buffer, len, uio)) != 0)
581 goto error;
582 } else
583 printf("%s(): len <= 0 : is this supposed to happen?!\n",__func__);
584
585 m = m_devget(buffer,len,0,NULL,NULL);
586
587 NG_SEND_DATA_ONLY(error,connection->active_hook,m);
588
589 return(0);
590
591error:
592 /* do error cleanup here */
593 printf("%s(): uiomove returned err: %d\n",__func__,ret);
594
595 return(ret);
596}
597
598/*
599 * we are being polled/selected
600 * check if there is data available for read
601 */
602static int
603ngdpoll(dev_t dev, int events, struct thread *td)
604{
605 int revents = 0;
606 struct ngd_softc *sc = &ngd_softc;
607 struct ngd_connection * connection = NULL;
608 struct ngd_connection * tmp;
609
610
611 if (events & (POLLIN | POLLRDNORM)) {
612 /* get the connection we have to know the loc from */
613 SLIST_FOREACH(tmp,&sc->head,links) {
614 if(tmp->ngddev == dev) {
615 connection = tmp;
616 }
617 }
618 if(connection == NULL) {
619 printf("%s(): ERROR: connection is still NULL,"
620 "no dev found\n",__func__);
621 return(-1);
622 }
623
624 if (connection->loc > 0)
625 revents |= events & (POLLIN | POLLRDNORM);
626 }
627
628 return(revents);
629}