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 * $FreeBSD$
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/kernel.h>
55 #include <sys/linker.h>
56 #include <sys/lock.h>
57 #include <sys/malloc.h>
58 #include <sys/mbuf.h>
59 #include <sys/mutex.h>
60 #include <sys/priv.h>
61 #include <sys/protosw.h>
62 #include <sys/queue.h>
63 #include <sys/socket.h>
64 #include <sys/socketvar.h>
65 #include <sys/syscallsubr.h>
66 #include <sys/sysctl.h>
67 #ifdef NOTYET
68 #include <sys/vnode.h>
69 #endif
70 #include <netgraph/ng_message.h>
71 #include <netgraph/netgraph.h>
72 #include <netgraph/ng_socketvar.h>
73 #include <netgraph/ng_socket.h>
74
75 #ifdef NG_SEPARATE_MALLOC
76 MALLOC_DEFINE(M_NETGRAPH_PATH, "netgraph_path", "netgraph path info ");
77 MALLOC_DEFINE(M_NETGRAPH_SOCK, "netgraph_sock", "netgraph socket info ");
78 #else
79 #define M_NETGRAPH_PATH M_NETGRAPH
80 #define M_NETGRAPH_SOCK M_NETGRAPH
81 #endif
82
83 /*
84 * It's Ascii-art time!
85 * +-------------+ +-------------+
86 * |socket (ctl)| |socket (data)|
87 * +-------------+ +-------------+
88 * ^ ^
89 * | |
90 * v v
91 * +-----------+ +-----------+
92 * |pcb (ctl)| |pcb (data)|
93 * +-----------+ +-----------+
94 * ^ ^
95 * | |
96 * v v
97 * +--------------------------+
98 * | Socket type private |
99 * | data |
100 * +--------------------------+
101 * ^
102 * |
103 * v
104 * +----------------+
105 * | struct ng_node |
106 * +----------------+
107 */
108
109 /* Netgraph node methods */
110 static ng_constructor_t ngs_constructor;
111 static ng_rcvmsg_t ngs_rcvmsg;
112 static ng_shutdown_t ngs_shutdown;
113 static ng_newhook_t ngs_newhook;
114 static ng_connect_t ngs_connect;
115 static ng_rcvdata_t ngs_rcvdata;
116 static ng_disconnect_t ngs_disconnect;
117
118 /* Internal methods */
119 static int ng_attach_data(struct socket *so);
120 static int ng_attach_cntl(struct socket *so);
121 static int ng_attach_common(struct socket *so, int type);
122 static void ng_detach_common(struct ngpcb *pcbp, int type);
123 static void ng_socket_free_priv(struct ngsock *priv);
124 #ifdef NOTYET
125 static int ng_internalize(struct mbuf *m, struct thread *p);
126 #endif
127 static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp);
128 static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp);
129
130 static int ngs_mod_event(module_t mod, int event, void *data);
131 static void ng_socket_item_applied(void *context, int error);
132
133 /* Netgraph type descriptor */
134 static struct ng_type typestruct = {
135 .version = NG_ABI_VERSION,
136 .name = NG_SOCKET_NODE_TYPE,
137 .mod_event = ngs_mod_event,
138 .constructor = ngs_constructor,
139 .rcvmsg = ngs_rcvmsg,
140 .shutdown = ngs_shutdown,
141 .newhook = ngs_newhook,
142 .connect = ngs_connect,
143 .rcvdata = ngs_rcvdata,
144 .disconnect = ngs_disconnect,
145 };
146 NETGRAPH_INIT_ORDERED(socket, &typestruct, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
147
148 /* Buffer space */
149 static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */
150 SYSCTL_INT(_net_graph, OID_AUTO, maxdgram, CTLFLAG_RW,
151 &ngpdg_sendspace , 0, "Maximum outgoing Netgraph datagram size");
152 static u_long ngpdg_recvspace = 20 * 1024;
153 SYSCTL_INT(_net_graph, OID_AUTO, recvspace, CTLFLAG_RW,
154 &ngpdg_recvspace , 0, "Maximum space for incoming Netgraph datagrams");
155
156 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb)
157
158 /* If getting unexplained errors returned, set this to "kdb_enter("X"); */
159 #ifndef TRAP_ERROR
160 #define TRAP_ERROR
161 #endif
162
163 /***************************************************************
164 Control sockets
165 ***************************************************************/
166
167 static int
168 ngc_attach(struct socket *so, int proto, struct thread *td)
169 {
170 struct ngpcb *const pcbp = sotongpcb(so);
171 int error;
172
173 error = priv_check(td, PRIV_NETGRAPH_CONTROL);
174 if (error)
175 return (error);
176 if (pcbp != NULL)
177 return (EISCONN);
178 return (ng_attach_cntl(so));
179 }
180
181 static void
182 ngc_detach(struct socket *so)
183 {
184 struct ngpcb *const pcbp = sotongpcb(so);
185
186 KASSERT(pcbp != NULL, ("ngc_detach: pcbp == NULL"));
187 ng_detach_common(pcbp, NG_CONTROL);
188 }
189
190 static int
191 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
192 struct mbuf *control, struct thread *td)
193 {
194 struct ngpcb *const pcbp = sotongpcb(so);
195 struct ngsock *const priv = NG_NODE_PRIVATE(pcbp->sockdata->node);
196 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
197 struct ng_mesg *msg;
198 struct mbuf *m0;
199 item_p item;
200 char *path = NULL;
201 int len, error = 0;
202 struct ng_apply_info apply;
203
204 #ifdef NOTYET
205 if (control && (error = ng_internalize(control, td))) {
206 if (pcbp->sockdata == NULL) {
207 error = ENOTCONN;
208 goto release;
209 }
210 }
211 #else /* NOTYET */
212 if (control) {
213 error = EINVAL;
214 goto release;
215 }
216 #endif /* NOTYET */
217
218 /* Require destination as there may be >= 1 hooks on this node. */
219 if (addr == NULL) {
220 error = EDESTADDRREQ;
221 goto release;
222 }
223
224 /*
225 * Allocate an expendable buffer for the path, chop off
226 * the sockaddr header, and make sure it's NUL terminated.
227 */
228 len = sap->sg_len - 2;
229 path = malloc(len + 1, M_NETGRAPH_PATH, M_WAITOK);
230 bcopy(sap->sg_data, path, len);
231 path[len] = '\0';
232
233 /*
234 * Move the actual message out of mbufs into a linear buffer.
235 * Start by adding up the size of the data. (could use mh_len?)
236 */
237 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next)
238 len += m0->m_len;
239
240 /*
241 * Move the data into a linear buffer as well.
242 * Messages are not delivered in mbufs.
243 */
244 msg = malloc(len + 1, M_NETGRAPH_MSG, M_WAITOK);
245 m_copydata(m, 0, len, (char *)msg);
246
247 if (msg->header.version != NG_VERSION) {
248 free(msg, M_NETGRAPH_MSG);
249 error = EINVAL;
250 goto release;
251 }
252
253 /*
254 * Hack alert!
255 * We look into the message and if it mkpeers a node of unknown type, we
256 * try to load it. We need to do this now, in syscall thread, because if
257 * message gets queued and applied later we will get panic.
258 */
259 if (msg->header.typecookie == NGM_GENERIC_COOKIE &&
260 msg->header.cmd == NGM_MKPEER) {
261 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data;
262
263 if (ng_findtype(mkp->type) == NULL) {
264 char filename[NG_TYPESIZ + 3];
265 int fileid;
266
267 /* Not found, try to load it as a loadable module. */
268 snprintf(filename, sizeof(filename), "ng_%s",
269 mkp->type);
270 error = kern_kldload(curthread, filename, &fileid);
271 if (error != 0) {
272 free(msg, M_NETGRAPH_MSG);
273 goto release;
274 }
275
276 /* See if type has been loaded successfully. */
277 if (ng_findtype(mkp->type) == NULL) {
278 free(msg, M_NETGRAPH_MSG);
279 (void)kern_kldunload(curthread, fileid,
280 LINKER_UNLOAD_NORMAL);
281 error = ENXIO;
282 goto release;
283 }
284 }
285 }
286
287 item = ng_package_msg(msg, M_WAITOK);
288 if ((error = ng_address_path((pcbp->sockdata->node), item, path, 0))
289 != 0) {
290 #ifdef TRACE_MESSAGES
291 printf("ng_address_path: errx=%d\n", error);
292 #endif
293 goto release;
294 }
295
296 #ifdef TRACE_MESSAGES
297 printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n",
298 item->el_dest->nd_ID,
299 msg->header.typecookie,
300 msg->header.cmd,
301 msg->header.cmdstr,
302 msg->header.flags,
303 msg->header.token,
304 item->el_dest->nd_type->name);
305 #endif
306 SAVE_LINE(item);
307 /*
308 * We do not want to return from syscall until the item
309 * is processed by destination node. We register callback
310 * on the item, which will update priv->error when item
311 * was applied.
312 * If ng_snd_item() has queued item, we sleep until
313 * callback wakes us up.
314 */
315 bzero(&apply, sizeof(apply));
316 apply.apply = ng_socket_item_applied;
317 apply.context = priv;
318 item->apply = &apply;
319 priv->error = -1;
320
321 error = ng_snd_item(item, 0);
322
323 mtx_lock(&priv->mtx);
324 if (priv->error == -1)
325 msleep(priv, &priv->mtx, 0, "ngsock", 0);
326 mtx_unlock(&priv->mtx);
327 KASSERT(priv->error != -1,
328 ("ng_socket: priv->error wasn't updated"));
329 error = priv->error;
330
331 release:
332 if (path != NULL)
333 free(path, M_NETGRAPH_PATH);
334 if (control != NULL)
335 m_freem(control);
336 if (m != NULL)
337 m_freem(m);
338 return (error);
339 }
340
341 static int
342 ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
343 {
344 struct ngpcb *const pcbp = sotongpcb(so);
345
346 if (pcbp == 0)
347 return (EINVAL);
348 return (ng_bind(nam, pcbp));
349 }
350
351 static int
352 ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
353 {
354 /*
355 * At this time refuse to do this.. it used to
356 * do something but it was undocumented and not used.
357 */
358 printf("program tried to connect control socket to remote node\n");
359 return (EINVAL);
360 }
361
362 /***************************************************************
363 Data sockets
364 ***************************************************************/
365
366 static int
367 ngd_attach(struct socket *so, int proto, struct thread *td)
368 {
369 struct ngpcb *const pcbp = sotongpcb(so);
370
371 if (pcbp != NULL)
372 return (EISCONN);
373 return (ng_attach_data(so));
374 }
375
376 static void
377 ngd_detach(struct socket *so)
378 {
379 struct ngpcb *const pcbp = sotongpcb(so);
380
381 KASSERT(pcbp != NULL, ("ngd_detach: pcbp == NULL"));
382 ng_detach_common(pcbp, NG_DATA);
383 }
384
385 static int
386 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
387 struct mbuf *control, struct thread *td)
388 {
389 struct ngpcb *const pcbp = sotongpcb(so);
390 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
391 int len, error;
392 hook_p hook = NULL;
393 char hookname[NG_HOOKSIZ];
394
395 if ((pcbp == NULL) || (control != NULL)) {
396 error = EINVAL;
397 goto release;
398 }
399 if (pcbp->sockdata == NULL) {
400 error = ENOTCONN;
401 goto release;
402 }
403
404 if (sap == NULL)
405 len = 0; /* Make compiler happy. */
406 else
407 len = sap->sg_len - 2;
408
409 /*
410 * If the user used any of these ways to not specify an address
411 * then handle specially.
412 */
413 if ((sap == NULL) || (len <= 0) || (*sap->sg_data == '\0')) {
414 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) {
415 error = EDESTADDRREQ;
416 goto release;
417 }
418 /*
419 * If exactly one hook exists, just use it.
420 * Special case to allow write(2) to work on an ng_socket.
421 */
422 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks);
423 } else {
424 if (len >= NG_HOOKSIZ) {
425 error = EINVAL;
426 goto release;
427 }
428
429 /*
430 * chop off the sockaddr header, and make sure it's NUL
431 * terminated
432 */
433 bcopy(sap->sg_data, hookname, len);
434 hookname[len] = '\0';
435
436 /* Find the correct hook from 'hookname' */
437 hook = ng_findhook(pcbp->sockdata->node, hookname);
438 if (hook == NULL) {
439 error = EHOSTUNREACH;
440 goto release;
441 }
442 }
443
444 /* Send data. */
445 NG_SEND_DATA_FLAGS(error, hook, m, NG_WAITOK);
446
447 release:
448 if (control != NULL)
449 m_freem(control);
450 if (m != NULL)
451 m_freem(m);
452 return (error);
453 }
454
455 static int
456 ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
457 {
458 struct ngpcb *const pcbp = sotongpcb(so);
459
460 if (pcbp == 0)
461 return (EINVAL);
462 return (ng_connect_data(nam, pcbp));
463 }
464
465 /*
466 * Used for both data and control sockets
467 */
468 static int
469 ng_getsockaddr(struct socket *so, struct sockaddr **addr)
470 {
471 struct ngpcb *pcbp;
472 struct sockaddr_ng *sg;
473 int sg_len;
474 int error = 0;
475
476 /* Why isn't sg_data a `char[1]' ? :-( */
477 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1;
478
479 pcbp = sotongpcb(so);
480 if ((pcbp == NULL) || (pcbp->sockdata == NULL))
481 /* XXXGL: can this still happen? */
482 return (EINVAL);
483
484 mtx_lock(&pcbp->sockdata->mtx);
485 if (pcbp->sockdata->node != NULL) {
486 node_p node = pcbp->sockdata->node;
487 int namelen = 0; /* silence compiler! */
488
489 if (NG_NODE_HAS_NAME(node))
490 sg_len += namelen = strlen(NG_NODE_NAME(node));
491
492 sg = malloc(sg_len, M_SONAME, M_WAITOK | M_ZERO);
493
494 if (NG_NODE_HAS_NAME(node))
495 bcopy(NG_NODE_NAME(node), sg->sg_data, namelen);
496
497 sg->sg_len = sg_len;
498 sg->sg_family = AF_NETGRAPH;
499 *addr = (struct sockaddr *)sg;
500 mtx_unlock(&pcbp->sockdata->mtx);
501 } else {
502 mtx_unlock(&pcbp->sockdata->mtx);
503 error = EINVAL;
504 }
505
506 return (error);
507 }
508
509 /*
510 * Attach a socket to it's protocol specific partner.
511 * For a control socket, actually create a netgraph node and attach
512 * to it as well.
513 */
514
515 static int
516 ng_attach_cntl(struct socket *so)
517 {
518 struct ngsock *priv;
519 struct ngpcb *pcbp;
520 int error;
521
522 /* Allocate node private info */
523 priv = malloc(sizeof(*priv), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO);
524
525 /* Setup protocol control block */
526 if ((error = ng_attach_common(so, NG_CONTROL)) != 0) {
527 free(priv, M_NETGRAPH_SOCK);
528 return (error);
529 }
530 pcbp = sotongpcb(so);
531
532 /* Link the pcb the private data. */
533 priv->ctlsock = pcbp;
534 pcbp->sockdata = priv;
535 priv->refs++;
536
537 /* Initialize mutex. */
538 mtx_init(&priv->mtx, "ng_socket", NULL, MTX_DEF);
539
540 /* Make the generic node components */
541 if ((error = ng_make_node_common(&typestruct, &priv->node)) != 0) {
542 free(priv, M_NETGRAPH_SOCK);
543 ng_detach_common(pcbp, NG_CONTROL);
544 return (error);
545 }
546
547 /* Link the node and the private data. */
548 NG_NODE_SET_PRIVATE(priv->node, priv);
549 NG_NODE_REF(priv->node);
550 priv->refs++;
551
552 return (0);
553 }
554
555 static int
556 ng_attach_data(struct socket *so)
557 {
558 return (ng_attach_common(so, NG_DATA));
559 }
560
561 /*
562 * Set up a socket protocol control block.
563 * This code is shared between control and data sockets.
564 */
565 static int
566 ng_attach_common(struct socket *so, int type)
567 {
568 struct ngpcb *pcbp;
569 int error;
570
571 /* Standard socket setup stuff. */
572 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace);
573 if (error)
574 return (error);
575
576 /* Allocate the pcb. */
577 pcbp = malloc(sizeof(struct ngpcb), M_PCB, M_WAITOK | M_ZERO);
578 pcbp->type = type;
579
580 /* Link the pcb and the socket. */
581 so->so_pcb = (caddr_t)pcbp;
582 pcbp->ng_socket = so;
583
584 return (0);
585 }
586
587 /*
588 * Disassociate the socket from it's protocol specific
589 * partner. If it's attached to a node's private data structure,
590 * then unlink from that too. If we were the last socket attached to it,
591 * then shut down the entire node. Shared code for control and data sockets.
592 */
593 static void
594 ng_detach_common(struct ngpcb *pcbp, int which)
595 {
596 struct ngsock *priv = pcbp->sockdata;
597
598 if (priv != NULL) {
599 mtx_lock(&priv->mtx);
600
601 switch (which) {
602 case NG_CONTROL:
603 priv->ctlsock = NULL;
604 break;
605 case NG_DATA:
606 priv->datasock = NULL;
607 break;
608 default:
609 panic(__func__);
610 }
611 pcbp->sockdata = NULL;
612
613 ng_socket_free_priv(priv);
614 }
615
616 pcbp->ng_socket->so_pcb = NULL;
617 free(pcbp, M_PCB);
618 }
619
620 /*
621 * Remove a reference from node private data.
622 */
623 static void
624 ng_socket_free_priv(struct ngsock *priv)
625 {
626 mtx_assert(&priv->mtx, MA_OWNED);
627
628 priv->refs--;
629
630 if (priv->refs == 0) {
631 mtx_destroy(&priv->mtx);
632 free(priv, M_NETGRAPH_SOCK);
633 return;
634 }
635
636 if ((priv->refs == 1) && (priv->node != NULL)) {
637 node_p node = priv->node;
638
639 priv->node = NULL;
640 mtx_unlock(&priv->mtx);
641 NG_NODE_UNREF(node);
642 ng_rmnode_self(node);
643 } else
644 mtx_unlock(&priv->mtx);
645 }
646
647 #ifdef NOTYET
648 /*
649 * File descriptors can be passed into an AF_NETGRAPH socket.
650 * Note, that file descriptors cannot be passed OUT.
651 * Only character device descriptors are accepted.
652 * Character devices are useful to connect a graph to a device,
653 * which after all is the purpose of this whole system.
654 */
655 static int
656 ng_internalize(struct mbuf *control, struct thread *td)
657 {
658 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *);
659 struct file *fp;
660 struct vnode *vn;
661 int oldfds;
662 int fd;
663
664 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET ||
665 cm->cmsg_len != control->m_len) {
666 TRAP_ERROR;
667 return (EINVAL);
668 }
669
670 /* Check there is only one FD. XXX what would more than one signify? */
671 oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int);
672 if (oldfds != 1) {
673 TRAP_ERROR;
674 return (EINVAL);
675 }
676
677 /* Check that the FD given is legit. and change it to a pointer to a
678 * struct file. */
679 fd = CMSG_DATA(cm);
680 if ((error = fget(td, fd, &fp)) != 0)
681 return (error);
682
683 /* Depending on what kind of resource it is, act differently. For
684 * devices, we treat it as a file. For an AF_NETGRAPH socket,
685 * shortcut straight to the node. */
686 switch (fp->f_type) {
687 case DTYPE_VNODE:
688 vn = fp->f_data;
689 if (vn && (vn->v_type == VCHR)) {
690 /* for a VCHR, actually reference the FILE */
691 fp->f_count++;
692 /* XXX then what :) */
693 /* how to pass on to other modules? */
694 } else {
695 fdrop(fp, td);
696 TRAP_ERROR;
697 return (EINVAL);
698 }
699 break;
700 default:
701 fdrop(fp, td);
702 TRAP_ERROR;
703 return (EINVAL);
704 }
705 fdrop(fp, td);
706 return (0);
707 }
708 #endif /* NOTYET */
709
710 /*
711 * Connect the data socket to a named control socket node.
712 */
713 static int
714 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp)
715 {
716 struct sockaddr_ng *sap;
717 node_p farnode;
718 struct ngsock *priv;
719 int error;
720 item_p item;
721
722 /* If we are already connected, don't do it again. */
723 if (pcbp->sockdata != NULL)
724 return (EISCONN);
725
726 /*
727 * Find the target (victim) and check it doesn't already have
728 * a data socket. Also check it is a 'socket' type node.
729 * Use ng_package_data() and ng_address_path() to do this.
730 */
731
732 sap = (struct sockaddr_ng *) nam;
733 /* The item will hold the node reference. */
734 item = ng_package_data(NULL, NG_WAITOK);
735
736 if ((error = ng_address_path(NULL, item, sap->sg_data, 0)))
737 return (error); /* item is freed on failure */
738
739 /*
740 * Extract node from item and free item. Remember we now have
741 * a reference on the node. The item holds it for us.
742 * when we free the item we release the reference.
743 */
744 farnode = item->el_dest; /* shortcut */
745 if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) {
746 NG_FREE_ITEM(item); /* drop the reference to the node */
747 return (EINVAL);
748 }
749 priv = NG_NODE_PRIVATE(farnode);
750 if (priv->datasock != NULL) {
751 NG_FREE_ITEM(item); /* drop the reference to the node */
752 return (EADDRINUSE);
753 }
754
755 /*
756 * Link the PCB and the private data struct. and note the extra
757 * reference. Drop the extra reference on the node.
758 */
759 mtx_lock(&priv->mtx);
760 priv->datasock = pcbp;
761 pcbp->sockdata = priv;
762 priv->refs++;
763 mtx_unlock(&priv->mtx);
764 NG_FREE_ITEM(item); /* drop the reference to the node */
765 return (0);
766 }
767
768 /*
769 * Binding a socket means giving the corresponding node a name
770 */
771 static int
772 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
773 {
774 struct ngsock *const priv = pcbp->sockdata;
775 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
776
777 if (priv == NULL) {
778 TRAP_ERROR;
779 return (EINVAL);
780 }
781 if ((sap->sg_len < 4) || (sap->sg_len > (NG_NODESIZ + 2)) ||
782 (sap->sg_data[0] == '\0') ||
783 (sap->sg_data[sap->sg_len - 3] != '\0')) {
784 TRAP_ERROR;
785 return (EINVAL);
786 }
787 return (ng_name_node(priv->node, sap->sg_data));
788 }
789
790 /***************************************************************
791 Netgraph node
792 ***************************************************************/
793
794 /*
795 * You can only create new nodes from the socket end of things.
796 */
797 static int
798 ngs_constructor(node_p nodep)
799 {
800 return (EINVAL);
801 }
802
803 /*
804 * We allow any hook to be connected to the node.
805 * There is no per-hook private information though.
806 */
807 static int
808 ngs_newhook(node_p node, hook_p hook, const char *name)
809 {
810 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node));
811 return (0);
812 }
813
814 /*
815 * If only one hook, allow read(2) and write(2) to work.
816 */
817 static int
818 ngs_connect(hook_p hook)
819 {
820 node_p node = NG_HOOK_NODE(hook);
821 struct ngsock *priv = NG_NODE_PRIVATE(node);
822
823 if ((priv->datasock) && (priv->datasock->ng_socket)) {
824 if (NG_NODE_NUMHOOKS(node) == 1)
825 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
826 else
827 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
828 }
829 return (0);
830 }
831
832 /*
833 * Incoming messages get passed up to the control socket.
834 * Unless they are for us specifically (socket_type)
835 */
836 static int
837 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook)
838 {
839 struct ngsock *const priv = NG_NODE_PRIVATE(node);
840 struct ngpcb *const pcbp = priv->ctlsock;
841 struct socket *so;
842 struct sockaddr_ng addr;
843 struct ng_mesg *msg;
844 struct mbuf *m;
845 ng_ID_t retaddr = NGI_RETADDR(item);
846 int addrlen;
847 int error = 0;
848
849 NGI_GET_MSG(item, msg);
850 NG_FREE_ITEM(item);
851
852 /*
853 * Only allow mesgs to be passed if we have the control socket.
854 * Data sockets can only support the generic messages.
855 */
856 if (pcbp == NULL) {
857 TRAP_ERROR;
858 NG_FREE_MSG(msg);
859 return (EINVAL);
860 }
861 so = pcbp->ng_socket;
862
863 #ifdef TRACE_MESSAGES
864 printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n",
865 retaddr,
866 msg->header.typecookie,
867 msg->header.cmd,
868 msg->header.cmdstr,
869 msg->header.flags,
870 msg->header.token);
871 #endif
872
873 if (msg->header.typecookie == NGM_SOCKET_COOKIE) {
874 switch (msg->header.cmd) {
875 case NGM_SOCK_CMD_NOLINGER:
876 priv->flags |= NGS_FLAG_NOLINGER;
877 break;
878 case NGM_SOCK_CMD_LINGER:
879 priv->flags &= ~NGS_FLAG_NOLINGER;
880 break;
881 default:
882 error = EINVAL; /* unknown command */
883 }
884 /* Free the message and return. */
885 NG_FREE_MSG(msg);
886 return (error);
887 }
888
889 /* Get the return address into a sockaddr. */
890 bzero(&addr, sizeof(addr));
891 addr.sg_len = sizeof(addr);
892 addr.sg_family = AF_NETGRAPH;
893 addrlen = snprintf((char *)&addr.sg_data, sizeof(addr.sg_data),
894 "[%x]:", retaddr);
895 if (addrlen < 0 || addrlen > sizeof(addr.sg_data)) {
896 printf("%s: snprintf([%x]) failed - %d\n", __func__, retaddr,
897 addrlen);
898 NG_FREE_MSG(msg);
899 return (EINVAL);
900 }
901
902 /* Copy the message itself into an mbuf chain. */
903 m = m_devget((caddr_t)msg, sizeof(struct ng_mesg) + msg->header.arglen,
904 0, NULL, NULL);
905
906 /*
907 * Here we free the message. We need to do that
908 * regardless of whether we got mbufs.
909 */
910 NG_FREE_MSG(msg);
911
912 if (m == NULL) {
913 TRAP_ERROR;
914 return (ENOBUFS);
915 }
916
917 /* Send it up to the socket. */
918 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)&addr, m, NULL) == 0) {
919 TRAP_ERROR;
920 m_freem(m);
921 return (ENOBUFS);
922 }
923 sorwakeup(so);
924
925 return (error);
926 }
927
928 /*
929 * Receive data on a hook
930 */
931 static int
932 ngs_rcvdata(hook_p hook, item_p item)
933 {
934 struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
935 struct ngpcb *const pcbp = priv->datasock;
936 struct socket *so;
937 struct sockaddr_ng *addr;
938 char *addrbuf[NG_HOOKSIZ + 4];
939 int addrlen;
940 struct mbuf *m;
941
942 NGI_GET_M(item, m);
943 NG_FREE_ITEM(item);
944
945 /* If there is no data socket, black-hole it. */
946 if (pcbp == NULL) {
947 NG_FREE_M(m);
948 return (0);
949 }
950 so = pcbp->ng_socket;
951
952 /* Get the return address into a sockaddr. */
953 addrlen = strlen(NG_HOOK_NAME(hook)); /* <= NG_HOOKSIZ - 1 */
954 addr = (struct sockaddr_ng *) addrbuf;
955 addr->sg_len = addrlen + 3;
956 addr->sg_family = AF_NETGRAPH;
957 bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen);
958 addr->sg_data[addrlen] = '\0';
959
960 /* Try to tell the socket which hook it came in on. */
961 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)addr, m, NULL) == 0) {
962 m_freem(m);
963 TRAP_ERROR;
964 return (ENOBUFS);
965 }
966 sorwakeup(so);
967 return (0);
968 }
969
970 /*
971 * Hook disconnection
972 *
973 * For this type, removal of the last link destroys the node
974 * if the NOLINGER flag is set.
975 */
976 static int
977 ngs_disconnect(hook_p hook)
978 {
979 node_p node = NG_HOOK_NODE(hook);
980 struct ngsock *const priv = NG_NODE_PRIVATE(node);
981
982 if ((priv->datasock) && (priv->datasock->ng_socket)) {
983 if (NG_NODE_NUMHOOKS(node) == 1)
984 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
985 else
986 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
987 }
988
989 if ((priv->flags & NGS_FLAG_NOLINGER) &&
990 (NG_NODE_NUMHOOKS(node) == 0) && (NG_NODE_IS_VALID(node)))
991 ng_rmnode_self(node);
992
993 return (0);
994 }
995
996 /*
997 * Do local shutdown processing.
998 * In this case, that involves making sure the socket
999 * knows we should be shutting down.
1000 */
1001 static int
1002 ngs_shutdown(node_p node)
1003 {
1004 struct ngsock *const priv = NG_NODE_PRIVATE(node);
1005 struct ngpcb *const dpcbp = priv->datasock;
1006 struct ngpcb *const pcbp = priv->ctlsock;
1007
1008 if (dpcbp != NULL)
1009 soisdisconnected(dpcbp->ng_socket);
1010
1011 if (pcbp != NULL)
1012 soisdisconnected(pcbp->ng_socket);
1013
1014 mtx_lock(&priv->mtx);
1015 priv->node = NULL;
1016 NG_NODE_SET_PRIVATE(node, NULL);
1017 ng_socket_free_priv(priv);
1018
1019 NG_NODE_UNREF(node);
1020 return (0);
1021 }
1022
1023 static void
1024 ng_socket_item_applied(void *context, int error)
1025 {
1026 struct ngsock *const priv = (struct ngsock *)context;
1027
1028 mtx_lock(&priv->mtx);
1029 priv->error = error;
1030 wakeup(priv);
1031 mtx_unlock(&priv->mtx);
1032
1033 }
1034
1035 static int
1036 dummy_disconnect(struct socket *so)
1037 {
1038 return (0);
1039 }
1040 /*
1041 * Control and data socket type descriptors
1042 *
1043 * XXXRW: Perhaps _close should do something?
1044 */
1045
1046 static struct pr_usrreqs ngc_usrreqs = {
1047 .pru_abort = NULL,
1048 .pru_attach = ngc_attach,
1049 .pru_bind = ngc_bind,
1050 .pru_connect = ngc_connect,
1051 .pru_detach = ngc_detach,
1052 .pru_disconnect = dummy_disconnect,
1053 .pru_peeraddr = NULL,
1054 .pru_send = ngc_send,
1055 .pru_shutdown = NULL,
1056 .pru_sockaddr = ng_getsockaddr,
1057 .pru_close = NULL,
1058 };
1059
1060 static struct pr_usrreqs ngd_usrreqs = {
1061 .pru_abort = NULL,
1062 .pru_attach = ngd_attach,
1063 .pru_bind = NULL,
1064 .pru_connect = ngd_connect,
1065 .pru_detach = ngd_detach,
1066 .pru_disconnect = dummy_disconnect,
1067 .pru_peeraddr = NULL,
1068 .pru_send = ngd_send,
1069 .pru_shutdown = NULL,
1070 .pru_sockaddr = ng_getsockaddr,
1071 .pru_close = NULL,
1072 };
1073
1074 /*
1075 * Definitions of protocols supported in the NETGRAPH domain.
1076 */
1077
1078 extern struct domain ngdomain; /* stop compiler warnings */
1079
1080 static struct protosw ngsw[] = {
1081 {
1082 .pr_type = SOCK_DGRAM,
1083 .pr_domain = &ngdomain,
1084 .pr_protocol = NG_CONTROL,
1085 .pr_flags = PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */,
1086 .pr_usrreqs = &ngc_usrreqs
1087 },
1088 {
1089 .pr_type = SOCK_DGRAM,
1090 .pr_domain = &ngdomain,
1091 .pr_protocol = NG_DATA,
1092 .pr_flags = PR_ATOMIC | PR_ADDR,
1093 .pr_usrreqs = &ngd_usrreqs
1094 }
1095 };
1096
1097 struct domain ngdomain = {
1098 .dom_family = AF_NETGRAPH,
1099 .dom_name = "netgraph",
1100 .dom_protosw = ngsw,
1101 .dom_protoswNPROTOSW = &ngsw[sizeof(ngsw) / sizeof(ngsw[0])]
1102 };
1103
1104 /*
1105 * Handle loading and unloading for this node type.
1106 * This is to handle auxiliary linkages (e.g protocol domain addition).
1107 */
1108 static int
1109 ngs_mod_event(module_t mod, int event, void *data)
1110 {
1111 int error = 0;
1112
1113 switch (event) {
1114 case MOD_LOAD:
1115 /* Register protocol domain. */
1116 net_add_domain(&ngdomain);
1117 break;
1118 case MOD_UNLOAD:
1119 #ifdef NOTYET
1120 /* Unregister protocol domain XXX can't do this yet.. */
1121 if ((error = net_rm_domain(&ngdomain)) != 0)
1122 break;
1123 else
1124 #endif
1125 error = EBUSY;
1126 break;
1127 default:
1128 error = EOPNOTSUPP;
1129 break;
1130 }
1131 return (error);
1132 }
1133
1134 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, "");
1135 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA");
1136 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, "");
1137 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL");
1138 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, "");
1139
Cache object: e22c6c77b20ddea18400ea7356bca3e6
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