1 /*
2 * ng_socket.c
3 *
4 * Copyright (c) 1996-1999 Whistle Communications, Inc.
5 * All rights reserved.
6 *
7 * Subject to the following obligations and disclaimer of warranty, use and
8 * redistribution of this software, in source or object code forms, with or
9 * without modifications are expressly permitted by Whistle Communications;
10 * provided, however, that:
11 * 1. Any and all reproductions of the source or object code must include the
12 * copyright notice above and the following disclaimer of warranties; and
13 * 2. No rights are granted, in any manner or form, to use Whistle
14 * Communications, Inc. trademarks, including the mark "WHISTLE
15 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
16 * such appears in the above copyright notice or in the software.
17 *
18 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
19 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
20 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
21 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
23 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
24 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
25 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
26 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
27 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
28 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
29 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
30 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
34 * OF SUCH DAMAGE.
35 *
36 * Author: Julian Elischer <julian@freebsd.org>
37 *
38 * $FreeBSD: releng/5.3/sys/netgraph/ng_socket.c 136588 2004-10-16 08:43:07Z cvs2svn $
39 * $Whistle: ng_socket.c,v 1.28 1999/11/01 09:24:52 julian Exp $
40 */
41
42 /*
43 * Netgraph socket nodes
44 *
45 * There are two types of netgraph sockets, control and data.
46 * Control sockets have a netgraph node, but data sockets are
47 * parasitic on control sockets, and have no node of their own.
48 */
49
50 #include <sys/param.h>
51 #include <sys/domain.h>
52 #include <sys/errno.h>
53 #include <sys/kdb.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/protosw.h>
61 #include <sys/queue.h>
62 #include <sys/signalvar.h>
63 #include <sys/socket.h>
64 #include <sys/socketvar.h>
65 #include <sys/sx.h>
66 #include <sys/sysctl.h>
67 #include <sys/systm.h>
68 #ifdef NOTYET
69 #include <sys/vnode.h>
70 #endif
71 #include <netgraph/ng_message.h>
72 #include <netgraph/netgraph.h>
73 #include <netgraph/ng_socketvar.h>
74 #include <netgraph/ng_socket.h>
75
76 #ifdef NG_SEPARATE_MALLOC
77 MALLOC_DEFINE(M_NETGRAPH_PATH, "netgraph_path", "netgraph path info ");
78 MALLOC_DEFINE(M_NETGRAPH_SOCK, "netgraph_sock", "netgraph socket info ");
79 #else
80 #define M_NETGRAPH_PATH M_NETGRAPH
81 #define M_NETGRAPH_SOCK M_NETGRAPH
82 #endif
83
84 /*
85 * It's Ascii-art time!
86 * +-------------+ +-------------+
87 * |socket (ctl)| |socket (data)|
88 * +-------------+ +-------------+
89 * ^ ^
90 * | |
91 * v v
92 * +-----------+ +-----------+
93 * |pcb (ctl)| |pcb (data)|
94 * +-----------+ +-----------+
95 * ^ ^
96 * | |
97 * v v
98 * +--------------------------+
99 * | Socket type private |
100 * | data |
101 * +--------------------------+
102 * ^
103 * |
104 * v
105 * +----------------+
106 * | struct ng_node |
107 * +----------------+
108 */
109
110 /* Netgraph node methods */
111 static ng_constructor_t ngs_constructor;
112 static ng_rcvmsg_t ngs_rcvmsg;
113 static ng_shutdown_t ngs_shutdown;
114 static ng_newhook_t ngs_newhook;
115 static ng_connect_t ngs_connect;
116 static ng_rcvdata_t ngs_rcvdata;
117 static ng_disconnect_t ngs_disconnect;
118
119 /* Internal methods */
120 static int ng_attach_data(struct socket *so);
121 static int ng_attach_cntl(struct socket *so);
122 static int ng_attach_common(struct socket *so, int type);
123 static void ng_detach_common(struct ngpcb *pcbp, int type);
124 /*static int ng_internalize(struct mbuf *m, struct thread *p); */
125
126 static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp);
127 static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp);
128
129 static int ngs_mod_event(module_t mod, int event, void *data);
130 static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg,
131 struct sockaddr_ng *addr);
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(socket, &typestruct);
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 /* List of all sockets */
157 static LIST_HEAD(, ngpcb) ngsocklist;
158
159 static struct mtx ngsocketlist_mtx;
160 MTX_SYSINIT(ngsocketlist, &ngsocketlist_mtx, "ng_socketlist", MTX_DEF);
161
162 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb)
163
164 /* If getting unexplained errors returned, set this to "kdb_enter("X"); */
165 #ifndef TRAP_ERROR
166 #define TRAP_ERROR
167 #endif
168
169 /***************************************************************
170 Control sockets
171 ***************************************************************/
172
173 static int
174 ngc_attach(struct socket *so, int proto, struct thread *td)
175 {
176 struct ngpcb *const pcbp = sotongpcb(so);
177
178 if (suser(td))
179 return (EPERM);
180 if (pcbp != NULL)
181 return (EISCONN);
182 return (ng_attach_cntl(so));
183 }
184
185 static int
186 ngc_detach(struct socket *so)
187 {
188 struct ngpcb *const pcbp = sotongpcb(so);
189
190 if (pcbp == NULL)
191 return (EINVAL);
192 ng_detach_common(pcbp, NG_CONTROL);
193 return (0);
194 }
195
196 static int
197 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
198 struct mbuf *control, struct thread *td)
199 {
200 struct ngpcb *const pcbp = sotongpcb(so);
201 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
202 struct ng_mesg *msg;
203 struct mbuf *m0;
204 char *path = NULL;
205 int len, error = 0;
206
207 if (pcbp == NULL) {
208 error = EINVAL;
209 goto release;
210 }
211 #ifdef NOTYET
212 if (control && (error = ng_internalize(control, td))) {
213 if (pcbp->sockdata == NULL) {
214 error = ENOTCONN;
215 goto release;
216 }
217 }
218 #else /* NOTYET */
219 if (control) {
220 error = EINVAL;
221 goto release;
222 }
223 #endif /* NOTYET */
224
225 /* Require destination as there may be >= 1 hooks on this node */
226 if (addr == NULL) {
227 error = EDESTADDRREQ;
228 goto release;
229 }
230
231 /* Allocate an expendable buffer for the path, chop off
232 * the sockaddr header, and make sure it's NUL terminated */
233 len = sap->sg_len - 2;
234 MALLOC(path, char *, len + 1, M_NETGRAPH_PATH, M_WAITOK);
235 if (path == NULL) {
236 error = ENOMEM;
237 goto release;
238 }
239 bcopy(sap->sg_data, path, len);
240 path[len] = '\0';
241
242 /* Move the actual message out of mbufs into a linear buffer.
243 * Start by adding up the size of the data. (could use mh_len?) */
244 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next)
245 len += m0->m_len;
246
247 /* Move the data into a linear buffer as well. Messages are not
248 * delivered in mbufs. */
249 MALLOC(msg, struct ng_mesg *, len + 1, M_NETGRAPH_MSG, M_WAITOK);
250 if (msg == NULL) {
251 error = ENOMEM;
252 goto release;
253 }
254 m_copydata(m, 0, len, (char *)msg);
255
256 #ifdef TRACE_MESSAGES
257 do {
258 item_p item;
259 if ((item = ng_package_msg(msg)) == NULL) {
260 (msg) = NULL;
261 (error) = ENOMEM;
262 printf("err=%d\n",error);
263 break;
264 }
265 if (((error) = ng_address_path((pcbp->sockdata->node), (item),
266 (path), (NULL))) == 0) {
267 printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n",
268 item->el_dest->nd_ID,
269 msg->header.typecookie,
270 msg->header.cmd,
271 msg->header.cmdstr,
272 msg->header.flags,
273 msg->header.token,
274 item->el_dest->nd_type->name);
275 SAVE_LINE(item);
276 (error) = ng_snd_item((item), 0);
277 }
278 else {
279 printf("errx=%d\n",error);
280 }
281 (msg) = NULL;
282 } while (0);
283
284 #else
285 /*
286 * Hack alert!
287 * We look into the message and if it mkpeers a node of unknown type, we
288 * try to load it. We need to do this now, in syscall thread, because if
289 * message gets queued and applied later we will get panic.
290 */
291 if (msg->header.typecookie == NGM_GENERIC_COOKIE &&
292 msg->header.cmd == NGM_MKPEER) {
293 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data;
294 struct ng_type *type;
295
296 if ((type = ng_findtype(mkp->type)) == NULL) {
297 char filename[NG_TYPESIZ + 3];
298 linker_file_t lf;
299 int error;
300
301 /* Not found, try to load it as a loadable module */
302 snprintf(filename, sizeof(filename), "ng_%s", mkp->type);
303 mtx_lock(&Giant);
304 error = linker_load_module(NULL, filename, NULL, NULL, &lf);
305 mtx_unlock(&Giant);
306 if (error != 0) {
307 FREE(msg, M_NETGRAPH_MSG);
308 goto release;
309 }
310 lf->userrefs++;
311
312 /* Try again, as now the type should have linked itself in */
313 if ((type = ng_findtype(mkp->type)) == NULL) {
314 FREE(msg, M_NETGRAPH_MSG);
315 error = ENXIO;
316 goto release;
317 }
318 }
319 }
320
321 /* The callee will free the msg when done. The path is our business. */
322 NG_SEND_MSG_PATH(error, pcbp->sockdata->node, msg, path, 0);
323 #endif
324 release:
325 if (path != NULL)
326 FREE(path, M_NETGRAPH_PATH);
327 if (control != NULL)
328 m_freem(control);
329 if (m != NULL)
330 m_freem(m);
331 return (error);
332 }
333
334 static int
335 ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
336 {
337 struct ngpcb *const pcbp = sotongpcb(so);
338
339 if (pcbp == 0)
340 return (EINVAL);
341 return (ng_bind(nam, pcbp));
342 }
343
344 static int
345 ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
346 {
347 printf(" program tried to connect control socket to remote node\n ");
348 /*
349 * At this time refuse to do this.. it used to
350 * do something but it was undocumented and not used.
351 */
352 return (EINVAL);
353 }
354
355 /***************************************************************
356 Data sockets
357 ***************************************************************/
358
359 static int
360 ngd_attach(struct socket *so, int proto, struct thread *td)
361 {
362 struct ngpcb *const pcbp = sotongpcb(so);
363
364 if (pcbp != NULL)
365 return (EISCONN);
366 return (ng_attach_data(so));
367 }
368
369 static int
370 ngd_detach(struct socket *so)
371 {
372 struct ngpcb *const pcbp = sotongpcb(so);
373
374 if (pcbp == NULL)
375 return (EINVAL);
376 ng_detach_common(pcbp, NG_DATA);
377 return (0);
378 }
379
380 static int
381 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
382 struct mbuf *control, struct thread *td)
383 {
384 struct ngpcb *const pcbp = sotongpcb(so);
385 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
386 int len, error;
387 hook_p hook = NULL;
388 char hookname[NG_HOOKSIZ];
389
390 if ((pcbp == NULL) || (control != NULL)) {
391 error = EINVAL;
392 goto release;
393 }
394 if (pcbp->sockdata == NULL) {
395 error = ENOTCONN;
396 goto release;
397 }
398 /*
399 * If the user used any of these ways to not specify an address
400 * then handle specially.
401 */
402 if ((sap == NULL)
403 || ((len = sap->sg_len - 2) <= 0)
404 || (*sap->sg_data == '\0')) {
405 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) {
406 error = EDESTADDRREQ;
407 goto release;
408 }
409 /*
410 * if exactly one hook exists, just use it.
411 * Special case to allow write(2) to work on an ng_socket.
412 */
413 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks);
414 } else {
415 if (len >= NG_HOOKSIZ) {
416 error = EINVAL;
417 goto release;
418 }
419
420 /*
421 * chop off the sockaddr header, and make sure it's NUL
422 * terminated
423 */
424 bcopy(sap->sg_data, hookname, len);
425 hookname[len] = '\0';
426
427 /* Find the correct hook from 'hookname' */
428 LIST_FOREACH(hook, &pcbp->sockdata->node->nd_hooks, hk_hooks) {
429 if (strcmp(hookname, NG_HOOK_NAME(hook)) == 0) {
430 break;
431 }
432 }
433 if (hook == NULL) {
434 error = EHOSTUNREACH;
435 }
436 }
437
438 /* Send data (OK if hook is NULL) */
439 NG_SEND_DATA_ONLY(error, hook, m); /* makes m NULL */
440
441 release:
442 if (control != NULL)
443 m_freem(control);
444 if (m != NULL)
445 m_freem(m);
446 return (error);
447 }
448
449 static int
450 ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
451 {
452 struct ngpcb *const pcbp = sotongpcb(so);
453
454 if (pcbp == 0)
455 return (EINVAL);
456 return (ng_connect_data(nam, pcbp));
457 }
458
459 /*
460 * Used for both data and control sockets
461 */
462 static int
463 ng_setsockaddr(struct socket *so, struct sockaddr **addr)
464 {
465 struct ngpcb *pcbp;
466 struct sockaddr_ng *sg;
467 int sg_len, namelen, s;
468
469 /* Why isn't sg_data a `char[1]' ? :-( */
470 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1;
471
472 s = splnet();
473 pcbp = sotongpcb(so);
474 if ((pcbp == NULL) || (pcbp->sockdata == NULL)) {
475 splx(s);
476 return (EINVAL);
477 }
478
479 namelen = 0; /* silence compiler ! */
480 if ( NG_NODE_HAS_NAME(pcbp->sockdata->node))
481 sg_len += namelen = strlen(NG_NODE_NAME(pcbp->sockdata->node));
482
483 MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK | M_ZERO);
484
485 if (NG_NODE_HAS_NAME(pcbp->sockdata->node))
486 bcopy(NG_NODE_NAME(pcbp->sockdata->node), sg->sg_data, namelen);
487 splx(s);
488
489 sg->sg_len = sg_len;
490 sg->sg_family = AF_NETGRAPH;
491 *addr = (struct sockaddr *)sg;
492
493 return (0);
494 }
495
496 /*
497 * Attach a socket to it's protocol specific partner.
498 * For a control socket, actually create a netgraph node and attach
499 * to it as well.
500 */
501
502 static int
503 ng_attach_cntl(struct socket *so)
504 {
505 struct ngsock *privdata;
506 struct ngpcb *pcbp;
507 int error;
508
509 /* Setup protocol control block */
510 if ((error = ng_attach_common(so, NG_CONTROL)) != 0)
511 return (error);
512 pcbp = sotongpcb(so);
513
514 /* Allocate node private info */
515 MALLOC(privdata, struct ngsock *,
516 sizeof(*privdata), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO);
517 if (privdata == NULL) {
518 ng_detach_common(pcbp, NG_CONTROL);
519 return (ENOMEM);
520 }
521
522 /* Make the generic node components */
523 if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) {
524 FREE(privdata, M_NETGRAPH_SOCK);
525 ng_detach_common(pcbp, NG_CONTROL);
526 return (error);
527 }
528 NG_NODE_SET_PRIVATE(privdata->node, privdata);
529
530 /* Link the pcb and the node private data */
531 privdata->ctlsock = pcbp;
532 pcbp->sockdata = privdata;
533 privdata->refs++;
534 return (0);
535 }
536
537 static int
538 ng_attach_data(struct socket *so)
539 {
540 return(ng_attach_common(so, NG_DATA));
541 }
542
543 /*
544 * Set up a socket protocol control block.
545 * This code is shared between control and data sockets.
546 */
547 static int
548 ng_attach_common(struct socket *so, int type)
549 {
550 struct ngpcb *pcbp;
551 int error;
552
553 /* Standard socket setup stuff */
554 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace);
555 if (error)
556 return (error);
557
558 /* Allocate the pcb */
559 MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO);
560 if (pcbp == NULL)
561 return (ENOMEM);
562 pcbp->type = type;
563
564 /* Link the pcb and the socket */
565 so->so_pcb = (caddr_t) pcbp;
566 pcbp->ng_socket = so;
567
568 /* Add the socket to linked list */
569 mtx_lock(&ngsocketlist_mtx);
570 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks);
571 mtx_unlock(&ngsocketlist_mtx);
572 return (0);
573 }
574
575 /*
576 * Disassociate the socket from it's protocol specific
577 * partner. If it's attached to a node's private data structure,
578 * then unlink from that too. If we were the last socket attached to it,
579 * then shut down the entire node. Shared code for control and data sockets.
580 */
581 static void
582 ng_detach_common(struct ngpcb *pcbp, int which)
583 {
584 struct ngsock *priv;
585
586 if (pcbp->sockdata) {
587 priv = pcbp->sockdata;
588 pcbp->sockdata = NULL;
589 switch (which) {
590 case NG_CONTROL:
591 priv->ctlsock = NULL;
592 break;
593 case NG_DATA:
594 priv->datasock = NULL;
595 break;
596 default:
597 panic(__func__);
598 }
599 if ((--priv->refs == 0) && (priv->node != NULL))
600 ng_rmnode_self(priv->node);
601 }
602 pcbp->ng_socket->so_pcb = NULL;
603 pcbp->ng_socket = NULL;
604 mtx_lock(&ngsocketlist_mtx);
605 LIST_REMOVE(pcbp, socks);
606 mtx_unlock(&ngsocketlist_mtx);
607 FREE(pcbp, M_PCB);
608 }
609
610 #ifdef NOTYET
611 /*
612 * File descriptors can be passed into an AF_NETGRAPH socket.
613 * Note, that file descriptors cannot be passed OUT.
614 * Only character device descriptors are accepted.
615 * Character devices are useful to connect a graph to a device,
616 * which after all is the purpose of this whole system.
617 */
618 static int
619 ng_internalize(struct mbuf *control, struct thread *td)
620 {
621 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *);
622 struct file *fp;
623 struct vnode *vn;
624 int oldfds;
625 int fd;
626
627 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET ||
628 cm->cmsg_len != control->m_len) {
629 TRAP_ERROR;
630 return (EINVAL);
631 }
632
633 /* Check there is only one FD. XXX what would more than one signify? */
634 oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int);
635 if (oldfds != 1) {
636 TRAP_ERROR;
637 return (EINVAL);
638 }
639
640 /* Check that the FD given is legit. and change it to a pointer to a
641 * struct file. */
642 fd = CMSG_DATA(cm);
643 if ((error = fget(td, fd, &fp)) != 0)
644 return (error);
645
646 /* Depending on what kind of resource it is, act differently. For
647 * devices, we treat it as a file. For an AF_NETGRAPH socket,
648 * shortcut straight to the node. */
649 switch (fp->f_type) {
650 case DTYPE_VNODE:
651 vn = fp->f_data;
652 if (vn && (vn->v_type == VCHR)) {
653 /* for a VCHR, actually reference the FILE */
654 fp->f_count++;
655 /* XXX then what :) */
656 /* how to pass on to other modules? */
657 } else {
658 fdrop(fp, td);
659 TRAP_ERROR;
660 return (EINVAL);
661 }
662 break;
663 default:
664 fdrop(fp, td);
665 TRAP_ERROR;
666 return (EINVAL);
667 }
668 fdrop(fp, td);
669 return (0);
670 }
671 #endif /* NOTYET */
672
673 /*
674 * Connect the data socket to a named control socket node.
675 */
676 static int
677 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp)
678 {
679 struct sockaddr_ng *sap;
680 node_p farnode;
681 struct ngsock *priv;
682 int error;
683 item_p item;
684
685 /* If we are already connected, don't do it again */
686 if (pcbp->sockdata != NULL)
687 return (EISCONN);
688
689 /* Find the target (victim) and check it doesn't already have a data
690 * socket. Also check it is a 'socket' type node.
691 * Use ng_package_data() and address_path() to do this.
692 */
693
694 sap = (struct sockaddr_ng *) nam;
695 /* The item will hold the node reference */
696 item = ng_package_data(NULL, NULL);
697 if (item == NULL) {
698 return (ENOMEM);
699 }
700 if ((error = ng_address_path(NULL, item, sap->sg_data, 0)))
701 return (error); /* item is freed on failure */
702
703 /*
704 * Extract node from item and free item. Remember we now have
705 * a reference on the node. The item holds it for us.
706 * when we free the item we release the reference.
707 */
708 farnode = item->el_dest; /* shortcut */
709 if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) {
710 NG_FREE_ITEM(item); /* drop the reference to the node */
711 return (EINVAL);
712 }
713 priv = NG_NODE_PRIVATE(farnode);
714 if (priv->datasock != NULL) {
715 NG_FREE_ITEM(item); /* drop the reference to the node */
716 return (EADDRINUSE);
717 }
718
719 /*
720 * Link the PCB and the private data struct. and note the extra
721 * reference. Drop the extra reference on the node.
722 */
723 priv->datasock = pcbp;
724 pcbp->sockdata = priv;
725 priv->refs++; /* XXX possible race if it's being freed */
726 NG_FREE_ITEM(item); /* drop the reference to the node */
727 return (0);
728 }
729
730 /*
731 * Binding a socket means giving the corresponding node a name
732 */
733 static int
734 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
735 {
736 struct ngsock *const priv = pcbp->sockdata;
737 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
738
739 if (priv == NULL) {
740 TRAP_ERROR;
741 return (EINVAL);
742 }
743 if ((sap->sg_len < 4)
744 || (sap->sg_len > (NG_NODESIZ + 2))
745 || (sap->sg_data[0] == '\0')
746 || (sap->sg_data[sap->sg_len - 3] != '\0')) {
747 TRAP_ERROR;
748 return (EINVAL);
749 }
750 return (ng_name_node(priv->node, sap->sg_data));
751 }
752
753 /*
754 * Take a message and pass it up to the control socket associated
755 * with the node.
756 */
757 static int
758 ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr)
759 {
760 struct socket *const so = pcbp->ng_socket;
761 struct mbuf *mdata;
762 int msglen;
763
764 /* Copy the message itself into an mbuf chain */
765 msglen = sizeof(struct ng_mesg) + msg->header.arglen;
766 mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL);
767
768 /* Here we free the message, as we are the end of the line.
769 * We need to do that regardless of whether we got mbufs. */
770 NG_FREE_MSG(msg);
771
772 if (mdata == NULL) {
773 TRAP_ERROR;
774 return (ENOBUFS);
775 }
776
777 /* Send it up to the socket */
778 if (sbappendaddr(&so->so_rcv,
779 (struct sockaddr *) addr, mdata, NULL) == 0) {
780 TRAP_ERROR;
781 m_freem(mdata);
782 return (ENOBUFS);
783 }
784 sorwakeup(so);
785 return (0);
786 }
787
788 /*
789 * You can only create new nodes from the socket end of things.
790 */
791 static int
792 ngs_constructor(node_p nodep)
793 {
794 return (EINVAL);
795 }
796
797 /*
798 * We allow any hook to be connected to the node.
799 * There is no per-hook private information though.
800 */
801 static int
802 ngs_newhook(node_p node, hook_p hook, const char *name)
803 {
804 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node));
805 return (0);
806 }
807
808 /*
809 * if only one hook, allow read(2) and write(2) to work.
810 */
811 static int
812 ngs_connect(hook_p hook)
813 {
814 node_p node = NG_HOOK_NODE(hook);
815 struct ngsock *priv = NG_NODE_PRIVATE(node);
816
817 if ((priv->datasock)
818 && (priv->datasock->ng_socket)) {
819 if (NG_NODE_NUMHOOKS(node) == 1) {
820 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
821 } else {
822 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
823 }
824 }
825 return (0);
826 }
827
828 /*
829 * Incoming messages get passed up to the control socket.
830 * Unless they are for us specifically (socket_type)
831 */
832 static int
833 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook)
834 {
835 struct ngsock *const priv = NG_NODE_PRIVATE(node);
836 struct ngpcb *const pcbp = priv->ctlsock;
837 struct sockaddr_ng *addr;
838 int addrlen;
839 int error = 0;
840 struct ng_mesg *msg;
841 ng_ID_t retaddr = NGI_RETADDR(item);
842 char retabuf[32];
843
844 NGI_GET_MSG(item, msg);
845 NG_FREE_ITEM(item); /* we have all we need */
846
847 /* Only allow mesgs to be passed if we have the control socket.
848 * Data sockets can only support the generic messages. */
849 if (pcbp == NULL) {
850 TRAP_ERROR;
851 return (EINVAL);
852 }
853 #ifdef TRACE_MESSAGES
854 printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n",
855 retaddr,
856 msg->header.typecookie,
857 msg->header.cmd,
858 msg->header.cmdstr,
859 msg->header.flags,
860 msg->header.token);
861
862 #endif
863
864 if (msg->header.typecookie == NGM_SOCKET_COOKIE) {
865 switch (msg->header.cmd) {
866 case NGM_SOCK_CMD_NOLINGER:
867 priv->flags |= NGS_FLAG_NOLINGER;
868 break;
869 case NGM_SOCK_CMD_LINGER:
870 priv->flags &= ~NGS_FLAG_NOLINGER;
871 break;
872 default:
873 error = EINVAL; /* unknown command */
874 }
875 /* Free the message and return */
876 NG_FREE_MSG(msg);
877 return(error);
878
879 }
880 /* Get the return address into a sockaddr */
881 sprintf(retabuf,"[%x]:", retaddr);
882 addrlen = strlen(retabuf);
883 MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH_PATH, M_NOWAIT);
884 if (addr == NULL) {
885 TRAP_ERROR;
886 return (ENOMEM);
887 }
888 addr->sg_len = addrlen + 3;
889 addr->sg_family = AF_NETGRAPH;
890 bcopy(retabuf, addr->sg_data, addrlen);
891 addr->sg_data[addrlen] = '\0';
892
893 /* Send it up */
894 error = ship_msg(pcbp, msg, addr);
895 FREE(addr, M_NETGRAPH_PATH);
896 return (error);
897 }
898
899 /*
900 * Receive data on a hook
901 */
902 static int
903 ngs_rcvdata(hook_p hook, item_p item)
904 {
905 struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
906 struct ngpcb *const pcbp = priv->datasock;
907 struct socket *so;
908 struct sockaddr_ng *addr;
909 char *addrbuf[NG_HOOKSIZ + 4];
910 int addrlen;
911 struct mbuf *m;
912
913 NGI_GET_M(item, m);
914 NG_FREE_ITEM(item);
915 /* If there is no data socket, black-hole it */
916 if (pcbp == NULL) {
917 NG_FREE_M(m);
918 return (0);
919 }
920 so = pcbp->ng_socket;
921
922 /* Get the return address into a sockaddr. */
923 addrlen = strlen(NG_HOOK_NAME(hook)); /* <= NG_HOOKSIZ - 1 */
924 addr = (struct sockaddr_ng *) addrbuf;
925 addr->sg_len = addrlen + 3;
926 addr->sg_family = AF_NETGRAPH;
927 bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen);
928 addr->sg_data[addrlen] = '\0';
929
930 /* Try to tell the socket which hook it came in on */
931 if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) {
932 m_freem(m);
933 TRAP_ERROR;
934 return (ENOBUFS);
935 }
936 sorwakeup(so);
937 return (0);
938 }
939
940 /*
941 * Hook disconnection
942 *
943 * For this type, removal of the last link destroys the node
944 * if the NOLINGER flag is set.
945 */
946 static int
947 ngs_disconnect(hook_p hook)
948 {
949 node_p node = NG_HOOK_NODE(hook);
950 struct ngsock *const priv = NG_NODE_PRIVATE(node);
951
952 if ((priv->datasock)
953 && (priv->datasock->ng_socket)) {
954 if (NG_NODE_NUMHOOKS(node) == 1) {
955 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
956 } else {
957 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
958 }
959 }
960
961 if ((priv->flags & NGS_FLAG_NOLINGER )
962 && (NG_NODE_NUMHOOKS(node) == 0)
963 && (NG_NODE_IS_VALID(node))) {
964 ng_rmnode_self(node);
965 }
966 return (0);
967 }
968
969 /*
970 * Do local shutdown processing.
971 * In this case, that involves making sure the socket
972 * knows we should be shutting down.
973 */
974 static int
975 ngs_shutdown(node_p node)
976 {
977 struct ngsock *const priv = NG_NODE_PRIVATE(node);
978 struct ngpcb *const dpcbp = priv->datasock;
979 struct ngpcb *const pcbp = priv->ctlsock;
980
981 if (dpcbp != NULL) {
982 soisdisconnected(dpcbp->ng_socket);
983 dpcbp->sockdata = NULL;
984 priv->datasock = NULL;
985 priv->refs--;
986 }
987 if (pcbp != NULL) {
988 soisdisconnected(pcbp->ng_socket);
989 pcbp->sockdata = NULL;
990 priv->ctlsock = NULL;
991 priv->refs--;
992 }
993 NG_NODE_SET_PRIVATE(node, NULL);
994 NG_NODE_UNREF(node);
995 FREE(priv, M_NETGRAPH_SOCK);
996 return (0);
997 }
998
999 static int
1000 dummy_disconnect(struct socket *so)
1001 {
1002 return (0);
1003 }
1004 /*
1005 * Control and data socket type descriptors
1006 */
1007
1008 static struct pr_usrreqs ngc_usrreqs = {
1009 NULL, /* abort */
1010 pru_accept_notsupp,
1011 ngc_attach,
1012 ngc_bind,
1013 ngc_connect,
1014 pru_connect2_notsupp,
1015 pru_control_notsupp,
1016 ngc_detach,
1017 dummy_disconnect, /* disconnect */
1018 pru_listen_notsupp,
1019 NULL, /* setpeeraddr */
1020 pru_rcvd_notsupp,
1021 pru_rcvoob_notsupp,
1022 ngc_send,
1023 pru_sense_null,
1024 NULL, /* shutdown */
1025 ng_setsockaddr,
1026 sosend,
1027 soreceive,
1028 sopoll,
1029 pru_sosetlabel_null
1030 };
1031
1032 static struct pr_usrreqs ngd_usrreqs = {
1033 NULL, /* abort */
1034 pru_accept_notsupp,
1035 ngd_attach,
1036 NULL, /* bind */
1037 ngd_connect,
1038 pru_connect2_notsupp,
1039 pru_control_notsupp,
1040 ngd_detach,
1041 dummy_disconnect, /* disconnect */
1042 pru_listen_notsupp,
1043 NULL, /* setpeeraddr */
1044 pru_rcvd_notsupp,
1045 pru_rcvoob_notsupp,
1046 ngd_send,
1047 pru_sense_null,
1048 NULL, /* shutdown */
1049 ng_setsockaddr,
1050 sosend,
1051 soreceive,
1052 sopoll,
1053 pru_sosetlabel_null
1054 };
1055
1056 /*
1057 * Definitions of protocols supported in the NETGRAPH domain.
1058 */
1059
1060 extern struct domain ngdomain; /* stop compiler warnings */
1061
1062 static struct protosw ngsw[] = {
1063 {
1064 SOCK_DGRAM, /* protocol type */
1065 &ngdomain, /* backpointer to domain */
1066 NG_CONTROL,
1067 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, /* flags */
1068 0, 0, 0, 0, /* input, output, ctlinput, ctloutput */
1069 NULL, /* ousrreq */
1070 0, 0, 0, 0, /* init, fasttimeo, slowtimo, drain */
1071 &ngc_usrreqs, /* usrreq table (above) */
1072 /*{NULL}*/ /* pffh (protocol filter head?) */
1073 },
1074 {
1075 SOCK_DGRAM, /* protocol type */
1076 &ngdomain, /* backpointer to domain */
1077 NG_DATA,
1078 PR_ATOMIC | PR_ADDR, /* flags */
1079 0, 0, 0, 0, /* input, output, ctlinput, ctloutput */
1080 NULL, /* ousrreq() */
1081 0, 0, 0, 0, /* init, fasttimeo, slowtimo, drain */
1082 &ngd_usrreqs, /* usrreq table (above) */
1083 /*{NULL}*/ /* pffh (protocol filter head?) */
1084 }
1085 };
1086
1087 struct domain ngdomain = {
1088 AF_NETGRAPH,
1089 "netgraph",
1090 NULL, /* init() */
1091 NULL, /* externalise() */
1092 NULL, /* dispose() */
1093 ngsw, /* protosw entry */
1094 &ngsw[sizeof(ngsw) / sizeof(ngsw[0])], /* Number of protosw entries */
1095 NULL, /* next domain in list */
1096 NULL, /* rtattach() */
1097 0, /* arg to rtattach in bits */
1098 0 /* maxrtkey */
1099 };
1100
1101 /*
1102 * Handle loading and unloading for this node type
1103 * This is to handle auxiliary linkages (e.g protocol domain addition).
1104 */
1105 static int
1106 ngs_mod_event(module_t mod, int event, void *data)
1107 {
1108 int error = 0;
1109
1110 switch (event) {
1111 case MOD_LOAD:
1112 /* Register protocol domain */
1113 net_add_domain(&ngdomain);
1114 break;
1115 case MOD_UNLOAD:
1116 /* Insure there are no open netgraph sockets */
1117 if (!LIST_EMPTY(&ngsocklist)) {
1118 error = EBUSY;
1119 break;
1120 }
1121
1122 #ifdef NOTYET
1123 if ((LIST_EMPTY(&ngsocklist)) && (typestruct.refs == 0)) {
1124 /* Unregister protocol domain XXX can't do this yet.. */
1125 if ((error = net_rm_domain(&ngdomain)) != 0)
1126 break;
1127 } else
1128 #endif
1129 error = EBUSY;
1130 break;
1131 default:
1132 error = EOPNOTSUPP;
1133 break;
1134 }
1135 return (error);
1136 }
1137
1138 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, "");
1139 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA");
1140 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, "");
1141 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL");
1142 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, "");
1143
Cache object: 7cc582912f8fbc628d096c7fb80c9525
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