1 /*
2 * ng_socket.c
3 */
4
5 /*-
6 * Copyright (c) 1996-1999 Whistle Communications, Inc.
7 * All rights reserved.
8 *
9 * Subject to the following obligations and disclaimer of warranty, use and
10 * redistribution of this software, in source or object code forms, with or
11 * without modifications are expressly permitted by Whistle Communications;
12 * provided, however, that:
13 * 1. Any and all reproductions of the source or object code must include the
14 * copyright notice above and the following disclaimer of warranties; and
15 * 2. No rights are granted, in any manner or form, to use Whistle
16 * Communications, Inc. trademarks, including the mark "WHISTLE
17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
18 * such appears in the above copyright notice or in the software.
19 *
20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
36 * OF SUCH DAMAGE.
37 *
38 * Author: Julian Elischer <julian@freebsd.org>
39 *
40 * $FreeBSD: releng/6.0/sys/netgraph/ng_socket.c 150382 2005-09-20 13:42:20Z glebius $
41 * $Whistle: ng_socket.c,v 1.28 1999/11/01 09:24:52 julian Exp $
42 */
43
44 /*
45 * Netgraph socket nodes
46 *
47 * There are two types of netgraph sockets, control and data.
48 * Control sockets have a netgraph node, but data sockets are
49 * parasitic on control sockets, and have no node of their own.
50 */
51
52 #include <sys/param.h>
53 #include <sys/domain.h>
54 #include <sys/errno.h>
55 #include <sys/kdb.h>
56 #include <sys/kernel.h>
57 #include <sys/linker.h>
58 #include <sys/lock.h>
59 #include <sys/malloc.h>
60 #include <sys/mbuf.h>
61 #include <sys/mutex.h>
62 #include <sys/protosw.h>
63 #include <sys/queue.h>
64 #include <sys/signalvar.h>
65 #include <sys/socket.h>
66 #include <sys/socketvar.h>
67 #include <sys/sx.h>
68 #include <sys/sysctl.h>
69 #include <sys/systm.h>
70 #ifdef NOTYET
71 #include <sys/vnode.h>
72 #endif
73 #include <netgraph/ng_message.h>
74 #include <netgraph/netgraph.h>
75 #include <netgraph/ng_socketvar.h>
76 #include <netgraph/ng_socket.h>
77
78 #ifdef NG_SEPARATE_MALLOC
79 MALLOC_DEFINE(M_NETGRAPH_PATH, "netgraph_path", "netgraph path info ");
80 MALLOC_DEFINE(M_NETGRAPH_SOCK, "netgraph_sock", "netgraph socket info ");
81 #else
82 #define M_NETGRAPH_PATH M_NETGRAPH
83 #define M_NETGRAPH_SOCK M_NETGRAPH
84 #endif
85
86 /*
87 * It's Ascii-art time!
88 * +-------------+ +-------------+
89 * |socket (ctl)| |socket (data)|
90 * +-------------+ +-------------+
91 * ^ ^
92 * | |
93 * v v
94 * +-----------+ +-----------+
95 * |pcb (ctl)| |pcb (data)|
96 * +-----------+ +-----------+
97 * ^ ^
98 * | |
99 * v v
100 * +--------------------------+
101 * | Socket type private |
102 * | data |
103 * +--------------------------+
104 * ^
105 * |
106 * v
107 * +----------------+
108 * | struct ng_node |
109 * +----------------+
110 */
111
112 /* Netgraph node methods */
113 static ng_constructor_t ngs_constructor;
114 static ng_rcvmsg_t ngs_rcvmsg;
115 static ng_shutdown_t ngs_shutdown;
116 static ng_newhook_t ngs_newhook;
117 static ng_connect_t ngs_connect;
118 static ng_rcvdata_t ngs_rcvdata;
119 static ng_disconnect_t ngs_disconnect;
120
121 /* Internal methods */
122 static int ng_attach_data(struct socket *so);
123 static int ng_attach_cntl(struct socket *so);
124 static int ng_attach_common(struct socket *so, int type);
125 static void ng_detach_common(node_p node, hook_p hook, void *arg1, int which);
126 /*static int ng_internalize(struct mbuf *m, struct thread *p); */
127
128 static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp);
129 static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp);
130
131 static int ngs_mod_event(module_t mod, int event, void *data);
132 static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg,
133 struct sockaddr_ng *addr);
134 static void ng_socket_item_applied(void *context, int error);
135
136 /* Netgraph type descriptor */
137 static struct ng_type typestruct = {
138 .version = NG_ABI_VERSION,
139 .name = NG_SOCKET_NODE_TYPE,
140 .mod_event = ngs_mod_event,
141 .constructor = ngs_constructor,
142 .rcvmsg = ngs_rcvmsg,
143 .shutdown = ngs_shutdown,
144 .newhook = ngs_newhook,
145 .connect = ngs_connect,
146 .rcvdata = ngs_rcvdata,
147 .disconnect = ngs_disconnect,
148 };
149 NETGRAPH_INIT_ORDERED(socket, &typestruct, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
150
151 /* Buffer space */
152 static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */
153 SYSCTL_INT(_net_graph, OID_AUTO, maxdgram, CTLFLAG_RW,
154 &ngpdg_sendspace , 0, "Maximum outgoing Netgraph datagram size");
155 static u_long ngpdg_recvspace = 20 * 1024;
156 SYSCTL_INT(_net_graph, OID_AUTO, recvspace, CTLFLAG_RW,
157 &ngpdg_recvspace , 0, "Maximum space for incoming Netgraph datagrams");
158
159 /* List of all sockets */
160 static LIST_HEAD(, ngpcb) ngsocklist;
161
162 static struct mtx ngsocketlist_mtx;
163
164 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb)
165
166 /* If getting unexplained errors returned, set this to "kdb_enter("X"); */
167 #ifndef TRAP_ERROR
168 #define TRAP_ERROR
169 #endif
170
171 /***************************************************************
172 Control sockets
173 ***************************************************************/
174
175 static int
176 ngc_attach(struct socket *so, int proto, struct thread *td)
177 {
178 struct ngpcb *const pcbp = sotongpcb(so);
179
180 if (suser(td))
181 return (EPERM);
182 if (pcbp != NULL)
183 return (EISCONN);
184 return (ng_attach_cntl(so));
185 }
186
187 static int
188 ngc_detach(struct socket *so)
189 {
190 struct ngpcb *const pcbp = sotongpcb(so);
191
192 if (pcbp == NULL)
193 return (EINVAL);
194
195 /*
196 * If there is a node, then obtain netgraph locking first.
197 */
198 if (pcbp->sockdata != NULL)
199 ng_send_fn1(pcbp->sockdata->node, NULL, &ng_detach_common,
200 pcbp, NG_CONTROL, NG_WAITOK);
201 else
202 ng_detach_common(NULL, NULL, pcbp, NG_CONTROL);
203
204 return (0);
205 }
206
207 static int
208 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
209 struct mbuf *control, struct thread *td)
210 {
211 struct ngpcb *const pcbp = sotongpcb(so);
212 struct ngsock *const priv = NG_NODE_PRIVATE(pcbp->sockdata->node);
213 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
214 struct ng_mesg *msg;
215 struct mbuf *m0;
216 item_p item;
217 char *path = NULL;
218 int len, error = 0;
219
220 if (pcbp == NULL) {
221 error = EINVAL;
222 goto release;
223 }
224 #ifdef NOTYET
225 if (control && (error = ng_internalize(control, td))) {
226 if (pcbp->sockdata == NULL) {
227 error = ENOTCONN;
228 goto release;
229 }
230 }
231 #else /* NOTYET */
232 if (control) {
233 error = EINVAL;
234 goto release;
235 }
236 #endif /* NOTYET */
237
238 /* Require destination as there may be >= 1 hooks on this node */
239 if (addr == NULL) {
240 error = EDESTADDRREQ;
241 goto release;
242 }
243
244 /* Allocate an expendable buffer for the path, chop off
245 * the sockaddr header, and make sure it's NUL terminated */
246 len = sap->sg_len - 2;
247 MALLOC(path, char *, len + 1, M_NETGRAPH_PATH, M_WAITOK);
248 if (path == NULL) {
249 error = ENOMEM;
250 goto release;
251 }
252 bcopy(sap->sg_data, path, len);
253 path[len] = '\0';
254
255 /* Move the actual message out of mbufs into a linear buffer.
256 * Start by adding up the size of the data. (could use mh_len?) */
257 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next)
258 len += m0->m_len;
259
260 /* Move the data into a linear buffer as well. Messages are not
261 * delivered in mbufs. */
262 MALLOC(msg, struct ng_mesg *, len + 1, M_NETGRAPH_MSG, M_WAITOK);
263 if (msg == NULL) {
264 error = ENOMEM;
265 goto release;
266 }
267 m_copydata(m, 0, len, (char *)msg);
268
269 if (msg->header.version != NG_VERSION) {
270 error = EINVAL;
271 goto release;
272 }
273
274 /*
275 * Hack alert!
276 * We look into the message and if it mkpeers a node of unknown type, we
277 * try to load it. We need to do this now, in syscall thread, because if
278 * message gets queued and applied later we will get panic.
279 */
280 if (msg->header.typecookie == NGM_GENERIC_COOKIE &&
281 msg->header.cmd == NGM_MKPEER) {
282 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data;
283 struct ng_type *type;
284
285 if ((type = ng_findtype(mkp->type)) == NULL) {
286 char filename[NG_TYPESIZ + 3];
287 linker_file_t lf;
288
289 /* Not found, try to load it as a loadable module. */
290 snprintf(filename, sizeof(filename), "ng_%s",
291 mkp->type);
292 mtx_lock(&Giant);
293 error = linker_load_module(NULL, filename, NULL, NULL,
294 &lf);
295 mtx_unlock(&Giant);
296 if (error != 0) {
297 FREE(msg, M_NETGRAPH_MSG);
298 goto release;
299 }
300 lf->userrefs++;
301
302 /* See if type has been loaded successfully. */
303 if ((type = ng_findtype(mkp->type)) == NULL) {
304 FREE(msg, M_NETGRAPH_MSG);
305 error = ENXIO;
306 goto release;
307 }
308 }
309 }
310
311 if ((item = ng_package_msg(msg, M_WAITOK)) == NULL) {
312 error = ENOMEM;
313 #ifdef TRACE_MESSAGES
314 printf("ng_package_msg: err=%d\n", error);
315 #endif
316 goto release;
317 }
318 if ((error = ng_address_path((pcbp->sockdata->node), item,
319 path, 0)) != 0) {
320 #ifdef TRACE_MESSAGES
321 printf("ng_address_path: errx=%d\n", error);
322 #endif
323 goto release;
324 }
325
326 #ifdef TRACE_MESSAGES
327 printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n",
328 item->el_dest->nd_ID,
329 msg->header.typecookie,
330 msg->header.cmd,
331 msg->header.cmdstr,
332 msg->header.flags,
333 msg->header.token,
334 item->el_dest->nd_type->name);
335 #endif
336 SAVE_LINE(item);
337 /*
338 * We do not want to return from syscall until the item
339 * is processed by destination node. We register callback
340 * on the item, which will update priv->error when item
341 * was applied.
342 * If ng_snd_item() has queued item, we sleep until
343 * callback wakes us up.
344 */
345 item->apply = ng_socket_item_applied;
346 item->context = priv;
347 priv->error = -1;
348
349 error = ng_snd_item(item, NG_PROGRESS);
350
351 if (error == EINPROGRESS) {
352 mtx_lock(&priv->mtx);
353 if (priv->error == -1)
354 msleep(priv, &priv->mtx, 0, "ngsock", 0);
355 mtx_unlock(&priv->mtx);
356 KASSERT(priv->error != -1,
357 ("ng_socket: priv->error wasn't updated"));
358 error = priv->error;
359 }
360
361 release:
362 if (path != NULL)
363 FREE(path, M_NETGRAPH_PATH);
364 if (control != NULL)
365 m_freem(control);
366 if (m != NULL)
367 m_freem(m);
368 return (error);
369 }
370
371 static int
372 ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
373 {
374 struct ngpcb *const pcbp = sotongpcb(so);
375
376 if (pcbp == 0)
377 return (EINVAL);
378 return (ng_bind(nam, pcbp));
379 }
380
381 static int
382 ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
383 {
384 printf(" program tried to connect control socket to remote node\n ");
385 /*
386 * At this time refuse to do this.. it used to
387 * do something but it was undocumented and not used.
388 */
389 return (EINVAL);
390 }
391
392 /***************************************************************
393 Data sockets
394 ***************************************************************/
395
396 static int
397 ngd_attach(struct socket *so, int proto, struct thread *td)
398 {
399 struct ngpcb *const pcbp = sotongpcb(so);
400
401 if (pcbp != NULL)
402 return (EISCONN);
403 return (ng_attach_data(so));
404 }
405
406 static int
407 ngd_detach(struct socket *so)
408 {
409 struct ngpcb *const pcbp = sotongpcb(so);
410
411 if (pcbp == NULL)
412 return (EINVAL);
413
414 /*
415 * If there is a node, then obtain netgraph locking first.
416 */
417 if (pcbp->sockdata != NULL)
418 ng_send_fn1(pcbp->sockdata->node, NULL, &ng_detach_common,
419 pcbp, NG_DATA, NG_WAITOK);
420 else
421 ng_detach_common(NULL, NULL, pcbp, NG_DATA);
422
423 return (0);
424 }
425
426 static int
427 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
428 struct mbuf *control, struct thread *td)
429 {
430 struct ngpcb *const pcbp = sotongpcb(so);
431 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
432 int len, error;
433 hook_p hook = NULL;
434 char hookname[NG_HOOKSIZ];
435
436 if ((pcbp == NULL) || (control != NULL)) {
437 error = EINVAL;
438 goto release;
439 }
440 if (pcbp->sockdata == NULL) {
441 error = ENOTCONN;
442 goto release;
443 }
444
445 if (sap == NULL)
446 len = 0; /* Make compiler happy. */
447 else
448 len = sap->sg_len - 2;
449
450 /*
451 * If the user used any of these ways to not specify an address
452 * then handle specially.
453 */
454 if ((sap == NULL) || (len <= 0) || (*sap->sg_data == '\0')) {
455 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) {
456 error = EDESTADDRREQ;
457 goto release;
458 }
459 /*
460 * if exactly one hook exists, just use it.
461 * Special case to allow write(2) to work on an ng_socket.
462 */
463 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks);
464 } else {
465 if (len >= NG_HOOKSIZ) {
466 error = EINVAL;
467 goto release;
468 }
469
470 /*
471 * chop off the sockaddr header, and make sure it's NUL
472 * terminated
473 */
474 bcopy(sap->sg_data, hookname, len);
475 hookname[len] = '\0';
476
477 /* Find the correct hook from 'hookname' */
478 LIST_FOREACH(hook, &pcbp->sockdata->node->nd_hooks, hk_hooks) {
479 if (strcmp(hookname, NG_HOOK_NAME(hook)) == 0) {
480 break;
481 }
482 }
483 if (hook == NULL) {
484 error = EHOSTUNREACH;
485 }
486 }
487
488 /* Send data (OK if hook is NULL) */
489 NG_SEND_DATA_ONLY(error, hook, m); /* makes m NULL */
490
491 release:
492 if (control != NULL)
493 m_freem(control);
494 if (m != NULL)
495 m_freem(m);
496 return (error);
497 }
498
499 static int
500 ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
501 {
502 struct ngpcb *const pcbp = sotongpcb(so);
503
504 if (pcbp == 0)
505 return (EINVAL);
506 return (ng_connect_data(nam, pcbp));
507 }
508
509 /*
510 * Used for both data and control sockets
511 */
512 static int
513 ng_setsockaddr(struct socket *so, struct sockaddr **addr)
514 {
515 struct ngpcb *pcbp;
516 struct sockaddr_ng *sg;
517 int sg_len, namelen, s;
518
519 /* Why isn't sg_data a `char[1]' ? :-( */
520 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1;
521
522 s = splnet();
523 pcbp = sotongpcb(so);
524 if ((pcbp == NULL) || (pcbp->sockdata == NULL)) {
525 splx(s);
526 return (EINVAL);
527 }
528
529 namelen = 0; /* silence compiler ! */
530 if ( NG_NODE_HAS_NAME(pcbp->sockdata->node))
531 sg_len += namelen = strlen(NG_NODE_NAME(pcbp->sockdata->node));
532
533 MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK | M_ZERO);
534
535 if (NG_NODE_HAS_NAME(pcbp->sockdata->node))
536 bcopy(NG_NODE_NAME(pcbp->sockdata->node), sg->sg_data, namelen);
537 splx(s);
538
539 sg->sg_len = sg_len;
540 sg->sg_family = AF_NETGRAPH;
541 *addr = (struct sockaddr *)sg;
542
543 return (0);
544 }
545
546 /*
547 * Attach a socket to it's protocol specific partner.
548 * For a control socket, actually create a netgraph node and attach
549 * to it as well.
550 */
551
552 static int
553 ng_attach_cntl(struct socket *so)
554 {
555 struct ngsock *privdata;
556 struct ngpcb *pcbp;
557 int error;
558
559 /* Setup protocol control block */
560 if ((error = ng_attach_common(so, NG_CONTROL)) != 0)
561 return (error);
562 pcbp = sotongpcb(so);
563
564 /* Allocate node private info */
565 MALLOC(privdata, struct ngsock *,
566 sizeof(*privdata), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO);
567 if (privdata == NULL) {
568 ng_detach_common(NULL, NULL, pcbp, NG_CONTROL);
569 return (ENOMEM);
570 }
571
572 /* Make the generic node components */
573 if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) {
574 FREE(privdata, M_NETGRAPH_SOCK);
575 ng_detach_common(NULL, NULL, pcbp, NG_CONTROL);
576 return (error);
577 }
578 NG_NODE_SET_PRIVATE(privdata->node, privdata);
579
580 mtx_init(&privdata->mtx, "ng_socket", NULL, MTX_DEF);
581
582 /* Link the pcb and the node private data */
583 privdata->ctlsock = pcbp;
584 pcbp->sockdata = privdata;
585 privdata->refs++;
586 return (0);
587 }
588
589 static int
590 ng_attach_data(struct socket *so)
591 {
592 return(ng_attach_common(so, NG_DATA));
593 }
594
595 /*
596 * Set up a socket protocol control block.
597 * This code is shared between control and data sockets.
598 */
599 static int
600 ng_attach_common(struct socket *so, int type)
601 {
602 struct ngpcb *pcbp;
603 int error;
604
605 /* Standard socket setup stuff */
606 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace);
607 if (error)
608 return (error);
609
610 /* Allocate the pcb */
611 MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO);
612 if (pcbp == NULL)
613 return (ENOMEM);
614 pcbp->type = type;
615
616 /* Link the pcb and the socket */
617 so->so_pcb = (caddr_t) pcbp;
618 pcbp->ng_socket = so;
619
620 /* Add the socket to linked list */
621 mtx_lock(&ngsocketlist_mtx);
622 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks);
623 mtx_unlock(&ngsocketlist_mtx);
624 return (0);
625 }
626
627 /*
628 * Disassociate the socket from it's protocol specific
629 * partner. If it's attached to a node's private data structure,
630 * then unlink from that too. If we were the last socket attached to it,
631 * then shut down the entire node. Shared code for control and data sockets.
632 */
633 static void
634 ng_detach_common(node_p node, hook_p hook, void *arg1, int which)
635 {
636 struct ngpcb *pcbp = arg1;
637
638 if (pcbp->sockdata) {
639 struct ngsock *priv;
640
641 priv = pcbp->sockdata;
642 pcbp->sockdata = NULL;
643 switch (which) {
644 case NG_CONTROL:
645 priv->ctlsock = NULL;
646 break;
647 case NG_DATA:
648 priv->datasock = NULL;
649 break;
650 default:
651 panic(__func__);
652 }
653 if ((--priv->refs == 0) && (priv->node != NULL))
654 ng_rmnode_self(priv->node);
655 }
656 pcbp->ng_socket->so_pcb = NULL;
657 pcbp->ng_socket = NULL;
658 mtx_lock(&ngsocketlist_mtx);
659 LIST_REMOVE(pcbp, socks);
660 mtx_unlock(&ngsocketlist_mtx);
661 FREE(pcbp, M_PCB);
662 }
663
664 #ifdef NOTYET
665 /*
666 * File descriptors can be passed into an AF_NETGRAPH socket.
667 * Note, that file descriptors cannot be passed OUT.
668 * Only character device descriptors are accepted.
669 * Character devices are useful to connect a graph to a device,
670 * which after all is the purpose of this whole system.
671 */
672 static int
673 ng_internalize(struct mbuf *control, struct thread *td)
674 {
675 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *);
676 struct file *fp;
677 struct vnode *vn;
678 int oldfds;
679 int fd;
680
681 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET ||
682 cm->cmsg_len != control->m_len) {
683 TRAP_ERROR;
684 return (EINVAL);
685 }
686
687 /* Check there is only one FD. XXX what would more than one signify? */
688 oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int);
689 if (oldfds != 1) {
690 TRAP_ERROR;
691 return (EINVAL);
692 }
693
694 /* Check that the FD given is legit. and change it to a pointer to a
695 * struct file. */
696 fd = CMSG_DATA(cm);
697 if ((error = fget(td, fd, &fp)) != 0)
698 return (error);
699
700 /* Depending on what kind of resource it is, act differently. For
701 * devices, we treat it as a file. For an AF_NETGRAPH socket,
702 * shortcut straight to the node. */
703 switch (fp->f_type) {
704 case DTYPE_VNODE:
705 vn = fp->f_data;
706 if (vn && (vn->v_type == VCHR)) {
707 /* for a VCHR, actually reference the FILE */
708 fp->f_count++;
709 /* XXX then what :) */
710 /* how to pass on to other modules? */
711 } else {
712 fdrop(fp, td);
713 TRAP_ERROR;
714 return (EINVAL);
715 }
716 break;
717 default:
718 fdrop(fp, td);
719 TRAP_ERROR;
720 return (EINVAL);
721 }
722 fdrop(fp, td);
723 return (0);
724 }
725 #endif /* NOTYET */
726
727 /*
728 * Connect the data socket to a named control socket node.
729 */
730 static int
731 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp)
732 {
733 struct sockaddr_ng *sap;
734 node_p farnode;
735 struct ngsock *priv;
736 int error;
737 item_p item;
738
739 /* If we are already connected, don't do it again */
740 if (pcbp->sockdata != NULL)
741 return (EISCONN);
742
743 /* Find the target (victim) and check it doesn't already have a data
744 * socket. Also check it is a 'socket' type node.
745 * Use ng_package_data() and address_path() to do this.
746 */
747
748 sap = (struct sockaddr_ng *) nam;
749 /* The item will hold the node reference */
750 item = ng_package_data(NULL, NG_WAITOK);
751 if (item == NULL) {
752 return (ENOMEM);
753 }
754 if ((error = ng_address_path(NULL, item, sap->sg_data, 0)))
755 return (error); /* item is freed on failure */
756
757 /*
758 * Extract node from item and free item. Remember we now have
759 * a reference on the node. The item holds it for us.
760 * when we free the item we release the reference.
761 */
762 farnode = item->el_dest; /* shortcut */
763 if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) {
764 NG_FREE_ITEM(item); /* drop the reference to the node */
765 return (EINVAL);
766 }
767 priv = NG_NODE_PRIVATE(farnode);
768 if (priv->datasock != NULL) {
769 NG_FREE_ITEM(item); /* drop the reference to the node */
770 return (EADDRINUSE);
771 }
772
773 /*
774 * Link the PCB and the private data struct. and note the extra
775 * reference. Drop the extra reference on the node.
776 */
777 priv->datasock = pcbp;
778 pcbp->sockdata = priv;
779 priv->refs++; /* XXX possible race if it's being freed */
780 NG_FREE_ITEM(item); /* drop the reference to the node */
781 return (0);
782 }
783
784 /*
785 * Binding a socket means giving the corresponding node a name
786 */
787 static int
788 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
789 {
790 struct ngsock *const priv = pcbp->sockdata;
791 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
792
793 if (priv == NULL) {
794 TRAP_ERROR;
795 return (EINVAL);
796 }
797 if ((sap->sg_len < 4)
798 || (sap->sg_len > (NG_NODESIZ + 2))
799 || (sap->sg_data[0] == '\0')
800 || (sap->sg_data[sap->sg_len - 3] != '\0')) {
801 TRAP_ERROR;
802 return (EINVAL);
803 }
804 return (ng_name_node(priv->node, sap->sg_data));
805 }
806
807 /*
808 * Take a message and pass it up to the control socket associated
809 * with the node.
810 */
811 static int
812 ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr)
813 {
814 struct socket *const so = pcbp->ng_socket;
815 struct mbuf *mdata;
816 int msglen;
817 int error = 0;
818
819 /* Copy the message itself into an mbuf chain */
820 msglen = sizeof(struct ng_mesg) + msg->header.arglen;
821 mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL);
822
823 /* Here we free the message, as we are the end of the line.
824 * We need to do that regardless of whether we got mbufs. */
825 NG_FREE_MSG(msg);
826
827 if (mdata == NULL) {
828 TRAP_ERROR;
829 return (ENOBUFS);
830 }
831
832 /* Send it up to the socket */
833 if (sbappendaddr(&so->so_rcv,
834 (struct sockaddr *) addr, mdata, NULL) == 0) {
835 TRAP_ERROR;
836 m_freem(mdata);
837 error = so->so_error = ENOBUFS;
838 }
839 sorwakeup(so);
840 return (error);
841 }
842
843 /***************************************************************
844 Netgraph node
845 ***************************************************************/
846
847 /*
848 * You can only create new nodes from the socket end of things.
849 */
850 static int
851 ngs_constructor(node_p nodep)
852 {
853 return (EINVAL);
854 }
855
856 /*
857 * We allow any hook to be connected to the node.
858 * There is no per-hook private information though.
859 */
860 static int
861 ngs_newhook(node_p node, hook_p hook, const char *name)
862 {
863 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node));
864 return (0);
865 }
866
867 /*
868 * if only one hook, allow read(2) and write(2) to work.
869 */
870 static int
871 ngs_connect(hook_p hook)
872 {
873 node_p node = NG_HOOK_NODE(hook);
874 struct ngsock *priv = NG_NODE_PRIVATE(node);
875
876 if ((priv->datasock)
877 && (priv->datasock->ng_socket)) {
878 if (NG_NODE_NUMHOOKS(node) == 1) {
879 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
880 } else {
881 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
882 }
883 }
884 return (0);
885 }
886
887 /*
888 * Incoming messages get passed up to the control socket.
889 * Unless they are for us specifically (socket_type)
890 */
891 static int
892 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook)
893 {
894 struct ngsock *const priv = NG_NODE_PRIVATE(node);
895 struct ngpcb *const pcbp = priv->ctlsock;
896 struct sockaddr_ng *addr;
897 int addrlen;
898 int error = 0;
899 struct ng_mesg *msg;
900 ng_ID_t retaddr = NGI_RETADDR(item);
901 char retabuf[32];
902
903 NGI_GET_MSG(item, msg);
904 NG_FREE_ITEM(item); /* we have all we need */
905
906 /* Only allow mesgs to be passed if we have the control socket.
907 * Data sockets can only support the generic messages. */
908 if (pcbp == NULL) {
909 TRAP_ERROR;
910 return (EINVAL);
911 }
912
913 #ifdef TRACE_MESSAGES
914 printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n",
915 retaddr,
916 msg->header.typecookie,
917 msg->header.cmd,
918 msg->header.cmdstr,
919 msg->header.flags,
920 msg->header.token);
921 #endif
922
923 if (msg->header.typecookie == NGM_SOCKET_COOKIE) {
924 switch (msg->header.cmd) {
925 case NGM_SOCK_CMD_NOLINGER:
926 priv->flags |= NGS_FLAG_NOLINGER;
927 break;
928 case NGM_SOCK_CMD_LINGER:
929 priv->flags &= ~NGS_FLAG_NOLINGER;
930 break;
931 default:
932 error = EINVAL; /* unknown command */
933 }
934 /* Free the message and return */
935 NG_FREE_MSG(msg);
936 return(error);
937
938 }
939 /* Get the return address into a sockaddr */
940 sprintf(retabuf,"[%x]:", retaddr);
941 addrlen = strlen(retabuf);
942 MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH_PATH, M_NOWAIT);
943 if (addr == NULL) {
944 TRAP_ERROR;
945 return (ENOMEM);
946 }
947 addr->sg_len = addrlen + 3;
948 addr->sg_family = AF_NETGRAPH;
949 bcopy(retabuf, addr->sg_data, addrlen);
950 addr->sg_data[addrlen] = '\0';
951
952 /* Send it up */
953 error = ship_msg(pcbp, msg, addr);
954 FREE(addr, M_NETGRAPH_PATH);
955 return (error);
956 }
957
958 /*
959 * Receive data on a hook
960 */
961 static int
962 ngs_rcvdata(hook_p hook, item_p item)
963 {
964 struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
965 struct ngpcb *const pcbp = priv->datasock;
966 struct socket *so;
967 struct sockaddr_ng *addr;
968 char *addrbuf[NG_HOOKSIZ + 4];
969 int addrlen;
970 struct mbuf *m;
971
972 NGI_GET_M(item, m);
973 NG_FREE_ITEM(item);
974 /* If there is no data socket, black-hole it */
975 if (pcbp == NULL) {
976 NG_FREE_M(m);
977 return (0);
978 }
979 so = pcbp->ng_socket;
980
981 /* Get the return address into a sockaddr. */
982 addrlen = strlen(NG_HOOK_NAME(hook)); /* <= NG_HOOKSIZ - 1 */
983 addr = (struct sockaddr_ng *) addrbuf;
984 addr->sg_len = addrlen + 3;
985 addr->sg_family = AF_NETGRAPH;
986 bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen);
987 addr->sg_data[addrlen] = '\0';
988
989 /* Try to tell the socket which hook it came in on */
990 if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) {
991 m_freem(m);
992 TRAP_ERROR;
993 return (ENOBUFS);
994 }
995 sorwakeup(so);
996 return (0);
997 }
998
999 /*
1000 * Hook disconnection
1001 *
1002 * For this type, removal of the last link destroys the node
1003 * if the NOLINGER flag is set.
1004 */
1005 static int
1006 ngs_disconnect(hook_p hook)
1007 {
1008 node_p node = NG_HOOK_NODE(hook);
1009 struct ngsock *const priv = NG_NODE_PRIVATE(node);
1010
1011 if ((priv->datasock)
1012 && (priv->datasock->ng_socket)) {
1013 if (NG_NODE_NUMHOOKS(node) == 1) {
1014 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
1015 } else {
1016 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
1017 }
1018 }
1019
1020 if ((priv->flags & NGS_FLAG_NOLINGER )
1021 && (NG_NODE_NUMHOOKS(node) == 0)
1022 && (NG_NODE_IS_VALID(node))) {
1023 ng_rmnode_self(node);
1024 }
1025 return (0);
1026 }
1027
1028 /*
1029 * Do local shutdown processing.
1030 * In this case, that involves making sure the socket
1031 * knows we should be shutting down.
1032 */
1033 static int
1034 ngs_shutdown(node_p node)
1035 {
1036 struct ngsock *const priv = NG_NODE_PRIVATE(node);
1037 struct ngpcb *const dpcbp = priv->datasock;
1038 struct ngpcb *const pcbp = priv->ctlsock;
1039
1040 if (dpcbp != NULL) {
1041 soisdisconnected(dpcbp->ng_socket);
1042 dpcbp->sockdata = NULL;
1043 priv->datasock = NULL;
1044 priv->refs--;
1045 }
1046 if (pcbp != NULL) {
1047 soisdisconnected(pcbp->ng_socket);
1048 pcbp->sockdata = NULL;
1049 priv->ctlsock = NULL;
1050 priv->refs--;
1051 }
1052 NG_NODE_SET_PRIVATE(node, NULL);
1053 NG_NODE_UNREF(node);
1054 mtx_destroy(&priv->mtx);
1055 FREE(priv, M_NETGRAPH_SOCK);
1056 return (0);
1057 }
1058
1059 static void
1060 ng_socket_item_applied(void *context, int error)
1061 {
1062 struct ngsock *const priv = (struct ngsock *)context;
1063
1064 mtx_lock(&priv->mtx);
1065 priv->error = error;
1066 wakeup(priv);
1067 mtx_unlock(&priv->mtx);
1068
1069 }
1070
1071 static int
1072 dummy_disconnect(struct socket *so)
1073 {
1074 return (0);
1075 }
1076 /*
1077 * Control and data socket type descriptors
1078 */
1079
1080 static struct pr_usrreqs ngc_usrreqs = {
1081 .pru_abort = NULL,
1082 .pru_attach = ngc_attach,
1083 .pru_bind = ngc_bind,
1084 .pru_connect = ngc_connect,
1085 .pru_detach = ngc_detach,
1086 .pru_disconnect = dummy_disconnect,
1087 .pru_peeraddr = NULL,
1088 .pru_send = ngc_send,
1089 .pru_shutdown = NULL,
1090 .pru_sockaddr = ng_setsockaddr,
1091 };
1092
1093 static struct pr_usrreqs ngd_usrreqs = {
1094 .pru_abort = NULL,
1095 .pru_attach = ngd_attach,
1096 .pru_bind = NULL,
1097 .pru_connect = ngd_connect,
1098 .pru_detach = ngd_detach,
1099 .pru_disconnect = dummy_disconnect,
1100 .pru_peeraddr = NULL,
1101 .pru_send = ngd_send,
1102 .pru_shutdown = NULL,
1103 .pru_sockaddr = ng_setsockaddr,
1104 };
1105
1106 /*
1107 * Definitions of protocols supported in the NETGRAPH domain.
1108 */
1109
1110 extern struct domain ngdomain; /* stop compiler warnings */
1111
1112 static struct protosw ngsw[] = {
1113 {
1114 SOCK_DGRAM, /* protocol type */
1115 &ngdomain, /* backpointer to domain */
1116 NG_CONTROL,
1117 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, /* flags */
1118 0, 0, 0, 0, /* input, output, ctlinput, ctloutput */
1119 NULL, /* ousrreq */
1120 0, 0, 0, 0, /* init, fasttimeo, slowtimo, drain */
1121 &ngc_usrreqs, /* usrreq table (above) */
1122 /*{NULL}*/ /* pffh (protocol filter head?) */
1123 },
1124 {
1125 SOCK_DGRAM, /* protocol type */
1126 &ngdomain, /* backpointer to domain */
1127 NG_DATA,
1128 PR_ATOMIC | PR_ADDR, /* flags */
1129 0, 0, 0, 0, /* input, output, ctlinput, ctloutput */
1130 NULL, /* ousrreq() */
1131 0, 0, 0, 0, /* init, fasttimeo, slowtimo, drain */
1132 &ngd_usrreqs, /* usrreq table (above) */
1133 /*{NULL}*/ /* pffh (protocol filter head?) */
1134 }
1135 };
1136
1137 struct domain ngdomain = {
1138 AF_NETGRAPH,
1139 "netgraph",
1140 NULL, /* init() */
1141 NULL, /* externalise() */
1142 NULL, /* dispose() */
1143 ngsw, /* protosw entry */
1144 &ngsw[sizeof(ngsw) / sizeof(ngsw[0])], /* Number of protosw entries */
1145 NULL, /* next domain in list */
1146 NULL, /* rtattach() */
1147 0, /* arg to rtattach in bits */
1148 0 /* maxrtkey */
1149 };
1150
1151 /*
1152 * Handle loading and unloading for this node type
1153 * This is to handle auxiliary linkages (e.g protocol domain addition).
1154 */
1155 static int
1156 ngs_mod_event(module_t mod, int event, void *data)
1157 {
1158 int error = 0;
1159
1160 switch (event) {
1161 case MOD_LOAD:
1162 mtx_init(&ngsocketlist_mtx, "ng_socketlist", NULL, MTX_DEF);
1163 /* Register protocol domain */
1164 net_add_domain(&ngdomain);
1165 break;
1166 case MOD_UNLOAD:
1167 /* Insure there are no open netgraph sockets */
1168 if (!LIST_EMPTY(&ngsocklist)) {
1169 error = EBUSY;
1170 break;
1171 }
1172
1173 #ifdef NOTYET
1174 if ((LIST_EMPTY(&ngsocklist)) && (typestruct.refs == 0)) {
1175 /* Unregister protocol domain XXX can't do this yet.. */
1176 if ((error = net_rm_domain(&ngdomain)) != 0)
1177 break;
1178 mtx_destroy(&ngsocketlist_mtx);
1179 } else
1180 #endif
1181 error = EBUSY;
1182 break;
1183 default:
1184 error = EOPNOTSUPP;
1185 break;
1186 }
1187 return (error);
1188 }
1189
1190 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, "");
1191 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA");
1192 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, "");
1193 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL");
1194 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, "");
1195
Cache object: 2b491ae42c917914b2b80b27e56c1d08
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