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/hash.h>
55 #include <sys/kernel.h>
56 #include <sys/linker.h>
57 #include <sys/lock.h>
58 #include <sys/malloc.h>
59 #include <sys/mbuf.h>
60 #include <sys/mutex.h>
61 #include <sys/priv.h>
62 #include <sys/protosw.h>
63 #include <sys/queue.h>
64 #include <sys/socket.h>
65 #include <sys/socketvar.h>
66 #include <sys/syscallsubr.h>
67 #include <sys/sysctl.h>
68
69 #include <net/vnet.h>
70
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 static MALLOC_DEFINE(M_NETGRAPH_PATH, "netgraph_path", "netgraph path info");
78 static 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_findhook_t ngs_findhook;
117 static ng_rcvdata_t ngs_rcvdata;
118 static ng_disconnect_t ngs_disconnect;
119
120 /* Internal methods */
121 static int ng_attach_data(struct socket *so);
122 static int ng_attach_cntl(struct socket *so);
123 static int ng_attach_common(struct socket *so, int type);
124 static void ng_detach_common(struct ngpcb *pcbp, int type);
125 static void ng_socket_free_priv(struct ngsock *priv);
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 void ng_socket_item_applied(void *context, int error);
131
132 /* Netgraph type descriptor */
133 static struct ng_type typestruct = {
134 .version = NG_ABI_VERSION,
135 .name = NG_SOCKET_NODE_TYPE,
136 .mod_event = ngs_mod_event,
137 .constructor = ngs_constructor,
138 .rcvmsg = ngs_rcvmsg,
139 .shutdown = ngs_shutdown,
140 .newhook = ngs_newhook,
141 .connect = ngs_connect,
142 .findhook = ngs_findhook,
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_ULONG(_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_ULONG(_net_graph, OID_AUTO, recvspace, CTLFLAG_RW,
154 &ngpdg_recvspace , 0, "Maximum space for incoming Netgraph datagrams");
155
156 /* List of all sockets (for netstat -f netgraph) */
157 static LIST_HEAD(, ngpcb) ngsocklist;
158
159 static struct mtx ngsocketlist_mtx;
160
161 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb)
162
163 /* If getting unexplained errors returned, set this to "kdb_enter("X"); */
164 #ifndef TRAP_ERROR
165 #define TRAP_ERROR
166 #endif
167
168 /***************************************************************
169 Control sockets
170 ***************************************************************/
171
172 static int
173 ngc_attach(struct socket *so, int proto, struct thread *td)
174 {
175 struct ngpcb *const pcbp = sotongpcb(so);
176 int error;
177
178 error = priv_check(td, PRIV_NETGRAPH_CONTROL);
179 if (error)
180 return (error);
181 if (pcbp != NULL)
182 return (EISCONN);
183 return (ng_attach_cntl(so));
184 }
185
186 static void
187 ngc_detach(struct socket *so)
188 {
189 struct ngpcb *const pcbp = sotongpcb(so);
190
191 KASSERT(pcbp != NULL, ("ngc_detach: pcbp == NULL"));
192 ng_detach_common(pcbp, NG_CONTROL);
193 }
194
195 static int
196 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
197 struct mbuf *control, struct thread *td)
198 {
199 struct ngpcb *const pcbp = sotongpcb(so);
200 struct ngsock *const priv = NG_NODE_PRIVATE(pcbp->sockdata->node);
201 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
202 struct ng_mesg *msg;
203 struct mbuf *m0;
204 item_p item;
205 char *path = NULL;
206 int len, error = 0;
207 struct ng_apply_info apply;
208
209 if (control) {
210 error = EINVAL;
211 goto release;
212 }
213
214 /* Require destination as there may be >= 1 hooks on this node. */
215 if (addr == NULL) {
216 error = EDESTADDRREQ;
217 goto release;
218 }
219
220 /*
221 * Allocate an expendable buffer for the path, chop off
222 * the sockaddr header, and make sure it's NUL terminated.
223 */
224 len = sap->sg_len - 2;
225 path = malloc(len + 1, M_NETGRAPH_PATH, M_WAITOK);
226 bcopy(sap->sg_data, path, len);
227 path[len] = '\0';
228
229 /*
230 * Move the actual message out of mbufs into a linear buffer.
231 * Start by adding up the size of the data. (could use mh_len?)
232 */
233 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next)
234 len += m0->m_len;
235
236 /*
237 * Move the data into a linear buffer as well.
238 * Messages are not delivered in mbufs.
239 */
240 msg = malloc(len + 1, M_NETGRAPH_MSG, M_WAITOK);
241 m_copydata(m, 0, len, (char *)msg);
242
243 if (msg->header.version != NG_VERSION) {
244 free(msg, M_NETGRAPH_MSG);
245 error = EINVAL;
246 goto release;
247 }
248
249 /*
250 * Hack alert!
251 * We look into the message and if it mkpeers a node of unknown type, we
252 * try to load it. We need to do this now, in syscall thread, because if
253 * message gets queued and applied later we will get panic.
254 */
255 if (msg->header.typecookie == NGM_GENERIC_COOKIE &&
256 msg->header.cmd == NGM_MKPEER) {
257 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data;
258
259 if (ng_findtype(mkp->type) == NULL) {
260 char filename[NG_TYPESIZ + 3];
261 int fileid;
262
263 /* Not found, try to load it as a loadable module. */
264 snprintf(filename, sizeof(filename), "ng_%s",
265 mkp->type);
266 error = kern_kldload(curthread, filename, &fileid);
267 if (error != 0) {
268 free(msg, M_NETGRAPH_MSG);
269 goto release;
270 }
271
272 /* See if type has been loaded successfully. */
273 if (ng_findtype(mkp->type) == NULL) {
274 free(msg, M_NETGRAPH_MSG);
275 (void)kern_kldunload(curthread, fileid,
276 LINKER_UNLOAD_NORMAL);
277 error = ENXIO;
278 goto release;
279 }
280 }
281 }
282
283 item = ng_package_msg(msg, M_WAITOK);
284 if ((error = ng_address_path((pcbp->sockdata->node), item, path, 0))
285 != 0) {
286 #ifdef TRACE_MESSAGES
287 printf("ng_address_path: errx=%d\n", error);
288 #endif
289 goto release;
290 }
291
292 #ifdef TRACE_MESSAGES
293 printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n",
294 item->el_dest->nd_ID,
295 msg->header.typecookie,
296 msg->header.cmd,
297 msg->header.cmdstr,
298 msg->header.flags,
299 msg->header.token,
300 item->el_dest->nd_type->name);
301 #endif
302 SAVE_LINE(item);
303 /*
304 * We do not want to return from syscall until the item
305 * is processed by destination node. We register callback
306 * on the item, which will update priv->error when item
307 * was applied.
308 * If ng_snd_item() has queued item, we sleep until
309 * callback wakes us up.
310 */
311 bzero(&apply, sizeof(apply));
312 apply.apply = ng_socket_item_applied;
313 apply.context = priv;
314 item->apply = &apply;
315 priv->error = -1;
316
317 error = ng_snd_item(item, 0);
318
319 mtx_lock(&priv->mtx);
320 if (priv->error == -1)
321 msleep(priv, &priv->mtx, 0, "ngsock", 0);
322 mtx_unlock(&priv->mtx);
323 KASSERT(priv->error != -1,
324 ("ng_socket: priv->error wasn't updated"));
325 error = priv->error;
326
327 release:
328 if (path != NULL)
329 free(path, M_NETGRAPH_PATH);
330 if (control != NULL)
331 m_freem(control);
332 if (m != NULL)
333 m_freem(m);
334 return (error);
335 }
336
337 static int
338 ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
339 {
340 struct ngpcb *const pcbp = sotongpcb(so);
341
342 if (pcbp == 0)
343 return (EINVAL);
344 return (ng_bind(nam, pcbp));
345 }
346
347 static int
348 ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
349 {
350 /*
351 * At this time refuse to do this.. it used to
352 * do something but it was undocumented and not used.
353 */
354 printf("program tried to connect control socket to remote node\n");
355 return (EINVAL);
356 }
357
358 /***************************************************************
359 Data sockets
360 ***************************************************************/
361
362 static int
363 ngd_attach(struct socket *so, int proto, struct thread *td)
364 {
365 struct ngpcb *const pcbp = sotongpcb(so);
366
367 if (pcbp != NULL)
368 return (EISCONN);
369 return (ng_attach_data(so));
370 }
371
372 static void
373 ngd_detach(struct socket *so)
374 {
375 struct ngpcb *const pcbp = sotongpcb(so);
376
377 KASSERT(pcbp != NULL, ("ngd_detach: pcbp == NULL"));
378 ng_detach_common(pcbp, NG_DATA);
379 }
380
381 static int
382 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
383 struct mbuf *control, struct thread *td)
384 {
385 struct ngpcb *const pcbp = sotongpcb(so);
386 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
387 int len, error;
388 hook_p hook = NULL;
389 char hookname[NG_HOOKSIZ];
390
391 if ((pcbp == NULL) || (control != NULL)) {
392 error = EINVAL;
393 goto release;
394 }
395 if (pcbp->sockdata == NULL) {
396 error = ENOTCONN;
397 goto release;
398 }
399
400 if (sap == NULL)
401 len = 0; /* Make compiler happy. */
402 else
403 len = sap->sg_len - 2;
404
405 /*
406 * If the user used any of these ways to not specify an address
407 * then handle specially.
408 */
409 if ((sap == NULL) || (len <= 0) || (*sap->sg_data == '\0')) {
410 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) {
411 error = EDESTADDRREQ;
412 goto release;
413 }
414 /*
415 * If exactly one hook exists, just use it.
416 * Special case to allow write(2) to work on an ng_socket.
417 */
418 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks);
419 } else {
420 if (len >= NG_HOOKSIZ) {
421 error = EINVAL;
422 goto release;
423 }
424
425 /*
426 * chop off the sockaddr header, and make sure it's NUL
427 * terminated
428 */
429 bcopy(sap->sg_data, hookname, len);
430 hookname[len] = '\0';
431
432 /* Find the correct hook from 'hookname' */
433 hook = ng_findhook(pcbp->sockdata->node, hookname);
434 if (hook == NULL) {
435 error = EHOSTUNREACH;
436 goto release;
437 }
438 }
439
440 /* Send data. */
441 NG_SEND_DATA_FLAGS(error, hook, m, NG_WAITOK);
442
443 release:
444 if (control != NULL)
445 m_freem(control);
446 if (m != NULL)
447 m_freem(m);
448 return (error);
449 }
450
451 static int
452 ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
453 {
454 struct ngpcb *const pcbp = sotongpcb(so);
455
456 if (pcbp == 0)
457 return (EINVAL);
458 return (ng_connect_data(nam, pcbp));
459 }
460
461 /*
462 * Used for both data and control sockets
463 */
464 static int
465 ng_getsockaddr(struct socket *so, struct sockaddr **addr)
466 {
467 struct ngpcb *pcbp;
468 struct sockaddr_ng *sg;
469 int sg_len;
470 int error = 0;
471
472 pcbp = sotongpcb(so);
473 if ((pcbp == NULL) || (pcbp->sockdata == NULL))
474 /* XXXGL: can this still happen? */
475 return (EINVAL);
476
477 sg_len = sizeof(struct sockaddr_ng) + NG_NODESIZ -
478 sizeof(sg->sg_data);
479 sg = malloc(sg_len, M_SONAME, M_WAITOK | M_ZERO);
480
481 mtx_lock(&pcbp->sockdata->mtx);
482 if (pcbp->sockdata->node != NULL) {
483 node_p node = pcbp->sockdata->node;
484
485 if (NG_NODE_HAS_NAME(node))
486 bcopy(NG_NODE_NAME(node), sg->sg_data,
487 strlen(NG_NODE_NAME(node)));
488 mtx_unlock(&pcbp->sockdata->mtx);
489
490 sg->sg_len = sg_len;
491 sg->sg_family = AF_NETGRAPH;
492 *addr = (struct sockaddr *)sg;
493 } else {
494 mtx_unlock(&pcbp->sockdata->mtx);
495 free(sg, M_SONAME);
496 error = EINVAL;
497 }
498
499 return (error);
500 }
501
502 /*
503 * Attach a socket to it's protocol specific partner.
504 * For a control socket, actually create a netgraph node and attach
505 * to it as well.
506 */
507
508 static int
509 ng_attach_cntl(struct socket *so)
510 {
511 struct ngsock *priv;
512 struct ngpcb *pcbp;
513 node_p node;
514 int error;
515
516 /* Setup protocol control block */
517 if ((error = ng_attach_common(so, NG_CONTROL)) != 0)
518 return (error);
519 pcbp = sotongpcb(so);
520
521 /* Make the generic node components */
522 if ((error = ng_make_node_common(&typestruct, &node)) != 0) {
523 ng_detach_common(pcbp, NG_CONTROL);
524 return (error);
525 }
526
527 /*
528 * Allocate node private info and hash. We start
529 * with 16 hash entries, however we may grow later
530 * in ngs_newhook(). We can't predict how much hooks
531 * does this node plan to have.
532 */
533 priv = malloc(sizeof(*priv), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO);
534 priv->hash = hashinit(16, M_NETGRAPH_SOCK, &priv->hmask);
535
536 /* Initialize mutex. */
537 mtx_init(&priv->mtx, "ng_socket", NULL, MTX_DEF);
538
539 /* Link the pcb the private data. */
540 priv->ctlsock = pcbp;
541 pcbp->sockdata = priv;
542 priv->refs++;
543 priv->node = node;
544
545 /* Store a hint for netstat(1). */
546 priv->node_id = priv->node->nd_ID;
547
548 /* Link the node and the private data. */
549 NG_NODE_SET_PRIVATE(priv->node, priv);
550 NG_NODE_REF(priv->node);
551 priv->refs++;
552
553 return (0);
554 }
555
556 static int
557 ng_attach_data(struct socket *so)
558 {
559 return (ng_attach_common(so, NG_DATA));
560 }
561
562 /*
563 * Set up a socket protocol control block.
564 * This code is shared between control and data sockets.
565 */
566 static int
567 ng_attach_common(struct socket *so, int type)
568 {
569 struct ngpcb *pcbp;
570 int error;
571
572 /* Standard socket setup stuff. */
573 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace);
574 if (error)
575 return (error);
576
577 /* Allocate the pcb. */
578 pcbp = malloc(sizeof(struct ngpcb), M_PCB, M_WAITOK | M_ZERO);
579 pcbp->type = type;
580
581 /* Link the pcb and the socket. */
582 so->so_pcb = (caddr_t)pcbp;
583 pcbp->ng_socket = so;
584
585 /* Add the socket to linked list */
586 mtx_lock(&ngsocketlist_mtx);
587 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks);
588 mtx_unlock(&ngsocketlist_mtx);
589 return (0);
590 }
591
592 /*
593 * Disassociate the socket from it's protocol specific
594 * partner. If it's attached to a node's private data structure,
595 * then unlink from that too. If we were the last socket attached to it,
596 * then shut down the entire node. Shared code for control and data sockets.
597 */
598 static void
599 ng_detach_common(struct ngpcb *pcbp, int which)
600 {
601 struct ngsock *priv = pcbp->sockdata;
602
603 if (priv != NULL) {
604 mtx_lock(&priv->mtx);
605
606 switch (which) {
607 case NG_CONTROL:
608 priv->ctlsock = NULL;
609 break;
610 case NG_DATA:
611 priv->datasock = NULL;
612 break;
613 default:
614 panic("%s", __func__);
615 }
616 pcbp->sockdata = NULL;
617
618 ng_socket_free_priv(priv);
619 }
620
621 pcbp->ng_socket->so_pcb = NULL;
622 mtx_lock(&ngsocketlist_mtx);
623 LIST_REMOVE(pcbp, socks);
624 mtx_unlock(&ngsocketlist_mtx);
625 free(pcbp, M_PCB);
626 }
627
628 /*
629 * Remove a reference from node private data.
630 */
631 static void
632 ng_socket_free_priv(struct ngsock *priv)
633 {
634 mtx_assert(&priv->mtx, MA_OWNED);
635
636 priv->refs--;
637
638 if (priv->refs == 0) {
639 mtx_destroy(&priv->mtx);
640 hashdestroy(priv->hash, M_NETGRAPH_SOCK, priv->hmask);
641 free(priv, M_NETGRAPH_SOCK);
642 return;
643 }
644
645 if ((priv->refs == 1) && (priv->node != NULL)) {
646 node_p node = priv->node;
647
648 priv->node = NULL;
649 mtx_unlock(&priv->mtx);
650 NG_NODE_UNREF(node);
651 ng_rmnode_self(node);
652 } else
653 mtx_unlock(&priv->mtx);
654 }
655
656 /*
657 * Connect the data socket to a named control socket node.
658 */
659 static int
660 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp)
661 {
662 struct sockaddr_ng *sap;
663 node_p farnode;
664 struct ngsock *priv;
665 int error;
666 item_p item;
667
668 /* If we are already connected, don't do it again. */
669 if (pcbp->sockdata != NULL)
670 return (EISCONN);
671
672 /*
673 * Find the target (victim) and check it doesn't already have
674 * a data socket. Also check it is a 'socket' type node.
675 * Use ng_package_data() and ng_address_path() to do this.
676 */
677
678 sap = (struct sockaddr_ng *) nam;
679 /* The item will hold the node reference. */
680 item = ng_package_data(NULL, NG_WAITOK);
681
682 if ((error = ng_address_path(NULL, item, sap->sg_data, 0)))
683 return (error); /* item is freed on failure */
684
685 /*
686 * Extract node from item and free item. Remember we now have
687 * a reference on the node. The item holds it for us.
688 * when we free the item we release the reference.
689 */
690 farnode = item->el_dest; /* shortcut */
691 if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) {
692 NG_FREE_ITEM(item); /* drop the reference to the node */
693 return (EINVAL);
694 }
695 priv = NG_NODE_PRIVATE(farnode);
696 if (priv->datasock != NULL) {
697 NG_FREE_ITEM(item); /* drop the reference to the node */
698 return (EADDRINUSE);
699 }
700
701 /*
702 * Link the PCB and the private data struct. and note the extra
703 * reference. Drop the extra reference on the node.
704 */
705 mtx_lock(&priv->mtx);
706 priv->datasock = pcbp;
707 pcbp->sockdata = priv;
708 priv->refs++;
709 mtx_unlock(&priv->mtx);
710 NG_FREE_ITEM(item); /* drop the reference to the node */
711 return (0);
712 }
713
714 /*
715 * Binding a socket means giving the corresponding node a name
716 */
717 static int
718 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
719 {
720 struct ngsock *const priv = pcbp->sockdata;
721 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
722
723 if (priv == NULL) {
724 TRAP_ERROR;
725 return (EINVAL);
726 }
727 if ((sap->sg_len < 4) || (sap->sg_len > (NG_NODESIZ + 2)) ||
728 (sap->sg_data[0] == '\0') ||
729 (sap->sg_data[sap->sg_len - 3] != '\0')) {
730 TRAP_ERROR;
731 return (EINVAL);
732 }
733 return (ng_name_node(priv->node, sap->sg_data));
734 }
735
736 /***************************************************************
737 Netgraph node
738 ***************************************************************/
739
740 /*
741 * You can only create new nodes from the socket end of things.
742 */
743 static int
744 ngs_constructor(node_p nodep)
745 {
746 return (EINVAL);
747 }
748
749 static void
750 ngs_rehash(node_p node)
751 {
752 struct ngsock *priv = NG_NODE_PRIVATE(node);
753 struct ngshash *new;
754 struct hookpriv *hp;
755 hook_p hook;
756 uint32_t h;
757 u_long hmask;
758
759 new = hashinit_flags((priv->hmask + 1) * 2, M_NETGRAPH_SOCK, &hmask,
760 HASH_NOWAIT);
761 if (new == NULL)
762 return;
763
764 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
765 hp = NG_HOOK_PRIVATE(hook);
766 #ifdef INVARIANTS
767 LIST_REMOVE(hp, next);
768 #endif
769 h = hash32_str(NG_HOOK_NAME(hook), HASHINIT) & hmask;
770 LIST_INSERT_HEAD(&new[h], hp, next);
771 }
772
773 hashdestroy(priv->hash, M_NETGRAPH_SOCK, priv->hmask);
774 priv->hash = new;
775 priv->hmask = hmask;
776 }
777
778 /*
779 * We allow any hook to be connected to the node.
780 * There is no per-hook private information though.
781 */
782 static int
783 ngs_newhook(node_p node, hook_p hook, const char *name)
784 {
785 struct ngsock *const priv = NG_NODE_PRIVATE(node);
786 struct hookpriv *hp;
787 uint32_t h;
788
789 hp = malloc(sizeof(*hp), M_NETGRAPH_SOCK, M_NOWAIT);
790 if (hp == NULL)
791 return (ENOMEM);
792 if (node->nd_numhooks * 2 > priv->hmask)
793 ngs_rehash(node);
794 hp->hook = hook;
795 h = hash32_str(name, HASHINIT) & priv->hmask;
796 LIST_INSERT_HEAD(&priv->hash[h], hp, next);
797 NG_HOOK_SET_PRIVATE(hook, hp);
798
799 return (0);
800 }
801
802 /*
803 * If only one hook, allow read(2) and write(2) to work.
804 */
805 static int
806 ngs_connect(hook_p hook)
807 {
808 node_p node = NG_HOOK_NODE(hook);
809 struct ngsock *priv = NG_NODE_PRIVATE(node);
810
811 if ((priv->datasock) && (priv->datasock->ng_socket)) {
812 if (NG_NODE_NUMHOOKS(node) == 1)
813 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
814 else
815 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
816 }
817 return (0);
818 }
819
820 /* Look up hook by name */
821 static hook_p
822 ngs_findhook(node_p node, const char *name)
823 {
824 struct ngsock *priv = NG_NODE_PRIVATE(node);
825 struct hookpriv *hp;
826 uint32_t h;
827
828 /*
829 * Microoptimisation for an ng_socket with
830 * a single hook, which is a common case.
831 */
832 if (node->nd_numhooks == 1) {
833 hook_p hook;
834
835 hook = LIST_FIRST(&node->nd_hooks);
836
837 if (strcmp(NG_HOOK_NAME(hook), name) == 0)
838 return (hook);
839 else
840 return (NULL);
841 }
842
843 h = hash32_str(name, HASHINIT) & priv->hmask;
844
845 LIST_FOREACH(hp, &priv->hash[h], next)
846 if (strcmp(NG_HOOK_NAME(hp->hook), name) == 0)
847 return (hp->hook);
848
849 return (NULL);
850 }
851
852 /*
853 * Incoming messages get passed up to the control socket.
854 * Unless they are for us specifically (socket_type)
855 */
856 static int
857 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook)
858 {
859 struct ngsock *const priv = NG_NODE_PRIVATE(node);
860 struct ngpcb *pcbp;
861 struct socket *so;
862 struct sockaddr_ng addr;
863 struct ng_mesg *msg;
864 struct mbuf *m;
865 ng_ID_t retaddr = NGI_RETADDR(item);
866 int addrlen;
867 int error = 0;
868
869 NGI_GET_MSG(item, msg);
870 NG_FREE_ITEM(item);
871
872 /*
873 * Grab priv->mtx here to prevent destroying of control socket
874 * after checking that priv->ctlsock is not NULL.
875 */
876 mtx_lock(&priv->mtx);
877 pcbp = priv->ctlsock;
878
879 /*
880 * Only allow mesgs to be passed if we have the control socket.
881 * Data sockets can only support the generic messages.
882 */
883 if (pcbp == NULL) {
884 mtx_unlock(&priv->mtx);
885 TRAP_ERROR;
886 NG_FREE_MSG(msg);
887 return (EINVAL);
888 }
889 so = pcbp->ng_socket;
890 SOCKBUF_LOCK(&so->so_rcv);
891
892 /* As long as the race is handled, priv->mtx may be unlocked now. */
893 mtx_unlock(&priv->mtx);
894
895 #ifdef TRACE_MESSAGES
896 printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n",
897 retaddr,
898 msg->header.typecookie,
899 msg->header.cmd,
900 msg->header.cmdstr,
901 msg->header.flags,
902 msg->header.token);
903 #endif
904
905 if (msg->header.typecookie == NGM_SOCKET_COOKIE) {
906 switch (msg->header.cmd) {
907 case NGM_SOCK_CMD_NOLINGER:
908 priv->flags |= NGS_FLAG_NOLINGER;
909 break;
910 case NGM_SOCK_CMD_LINGER:
911 priv->flags &= ~NGS_FLAG_NOLINGER;
912 break;
913 default:
914 error = EINVAL; /* unknown command */
915 }
916 SOCKBUF_UNLOCK(&so->so_rcv);
917
918 /* Free the message and return. */
919 NG_FREE_MSG(msg);
920 return (error);
921 }
922
923 /* Get the return address into a sockaddr. */
924 bzero(&addr, sizeof(addr));
925 addr.sg_len = sizeof(addr);
926 addr.sg_family = AF_NETGRAPH;
927 addrlen = snprintf((char *)&addr.sg_data, sizeof(addr.sg_data),
928 "[%x]:", retaddr);
929 if (addrlen < 0 || addrlen > sizeof(addr.sg_data)) {
930 SOCKBUF_UNLOCK(&so->so_rcv);
931 printf("%s: snprintf([%x]) failed - %d\n", __func__, retaddr,
932 addrlen);
933 NG_FREE_MSG(msg);
934 return (EINVAL);
935 }
936
937 /* Copy the message itself into an mbuf chain. */
938 m = m_devget((caddr_t)msg, sizeof(struct ng_mesg) + msg->header.arglen,
939 0, NULL, NULL);
940
941 /*
942 * Here we free the message. We need to do that
943 * regardless of whether we got mbufs.
944 */
945 NG_FREE_MSG(msg);
946
947 if (m == NULL) {
948 SOCKBUF_UNLOCK(&so->so_rcv);
949 TRAP_ERROR;
950 return (ENOBUFS);
951 }
952
953 /* Send it up to the socket. */
954 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&addr, m,
955 NULL) == 0) {
956 SOCKBUF_UNLOCK(&so->so_rcv);
957 TRAP_ERROR;
958 m_freem(m);
959 return (ENOBUFS);
960 }
961 sorwakeup_locked(so);
962
963 return (error);
964 }
965
966 /*
967 * Receive data on a hook
968 */
969 static int
970 ngs_rcvdata(hook_p hook, item_p item)
971 {
972 struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
973 struct ngpcb *const pcbp = priv->datasock;
974 struct socket *so;
975 struct sockaddr_ng *addr;
976 char *addrbuf[NG_HOOKSIZ + 4];
977 int addrlen;
978 struct mbuf *m;
979
980 NGI_GET_M(item, m);
981 NG_FREE_ITEM(item);
982
983 /* If there is no data socket, black-hole it. */
984 if (pcbp == NULL) {
985 NG_FREE_M(m);
986 return (0);
987 }
988 so = pcbp->ng_socket;
989
990 /* Get the return address into a sockaddr. */
991 addrlen = strlen(NG_HOOK_NAME(hook)); /* <= NG_HOOKSIZ - 1 */
992 addr = (struct sockaddr_ng *) addrbuf;
993 addr->sg_len = addrlen + 3;
994 addr->sg_family = AF_NETGRAPH;
995 bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen);
996 addr->sg_data[addrlen] = '\0';
997
998 /* Try to tell the socket which hook it came in on. */
999 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)addr, m, NULL) == 0) {
1000 m_freem(m);
1001 TRAP_ERROR;
1002 return (ENOBUFS);
1003 }
1004 sorwakeup(so);
1005 return (0);
1006 }
1007
1008 /*
1009 * Hook disconnection
1010 *
1011 * For this type, removal of the last link destroys the node
1012 * if the NOLINGER flag is set.
1013 */
1014 static int
1015 ngs_disconnect(hook_p hook)
1016 {
1017 node_p node = NG_HOOK_NODE(hook);
1018 struct ngsock *const priv = NG_NODE_PRIVATE(node);
1019 struct hookpriv *hp = NG_HOOK_PRIVATE(hook);
1020
1021 LIST_REMOVE(hp, next);
1022 free(hp, M_NETGRAPH_SOCK);
1023
1024 if ((priv->datasock) && (priv->datasock->ng_socket)) {
1025 if (NG_NODE_NUMHOOKS(node) == 1)
1026 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
1027 else
1028 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
1029 }
1030
1031 if ((priv->flags & NGS_FLAG_NOLINGER) &&
1032 (NG_NODE_NUMHOOKS(node) == 0) && (NG_NODE_IS_VALID(node)))
1033 ng_rmnode_self(node);
1034
1035 return (0);
1036 }
1037
1038 /*
1039 * Do local shutdown processing.
1040 * In this case, that involves making sure the socket
1041 * knows we should be shutting down.
1042 */
1043 static int
1044 ngs_shutdown(node_p node)
1045 {
1046 struct ngsock *const priv = NG_NODE_PRIVATE(node);
1047 struct ngpcb *dpcbp, *pcbp;
1048
1049 mtx_lock(&priv->mtx);
1050 dpcbp = priv->datasock;
1051 pcbp = priv->ctlsock;
1052
1053 if (dpcbp != NULL)
1054 soisdisconnected(dpcbp->ng_socket);
1055
1056 if (pcbp != NULL)
1057 soisdisconnected(pcbp->ng_socket);
1058
1059 priv->node = NULL;
1060 NG_NODE_SET_PRIVATE(node, NULL);
1061 ng_socket_free_priv(priv);
1062
1063 NG_NODE_UNREF(node);
1064 return (0);
1065 }
1066
1067 static void
1068 ng_socket_item_applied(void *context, int error)
1069 {
1070 struct ngsock *const priv = (struct ngsock *)context;
1071
1072 mtx_lock(&priv->mtx);
1073 priv->error = error;
1074 wakeup(priv);
1075 mtx_unlock(&priv->mtx);
1076
1077 }
1078
1079 static int
1080 dummy_disconnect(struct socket *so)
1081 {
1082 return (0);
1083 }
1084 /*
1085 * Control and data socket type descriptors
1086 *
1087 * XXXRW: Perhaps _close should do something?
1088 */
1089
1090 static struct pr_usrreqs ngc_usrreqs = {
1091 .pru_abort = NULL,
1092 .pru_attach = ngc_attach,
1093 .pru_bind = ngc_bind,
1094 .pru_connect = ngc_connect,
1095 .pru_detach = ngc_detach,
1096 .pru_disconnect = dummy_disconnect,
1097 .pru_peeraddr = NULL,
1098 .pru_send = ngc_send,
1099 .pru_shutdown = NULL,
1100 .pru_sockaddr = ng_getsockaddr,
1101 .pru_close = NULL,
1102 };
1103
1104 static struct pr_usrreqs ngd_usrreqs = {
1105 .pru_abort = NULL,
1106 .pru_attach = ngd_attach,
1107 .pru_bind = NULL,
1108 .pru_connect = ngd_connect,
1109 .pru_detach = ngd_detach,
1110 .pru_disconnect = dummy_disconnect,
1111 .pru_peeraddr = NULL,
1112 .pru_send = ngd_send,
1113 .pru_shutdown = NULL,
1114 .pru_sockaddr = ng_getsockaddr,
1115 .pru_close = NULL,
1116 };
1117
1118 /*
1119 * Definitions of protocols supported in the NETGRAPH domain.
1120 */
1121
1122 extern struct domain ngdomain; /* stop compiler warnings */
1123
1124 static struct protosw ngsw[] = {
1125 {
1126 .pr_type = SOCK_DGRAM,
1127 .pr_domain = &ngdomain,
1128 .pr_protocol = NG_CONTROL,
1129 .pr_flags = PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */,
1130 .pr_usrreqs = &ngc_usrreqs
1131 },
1132 {
1133 .pr_type = SOCK_DGRAM,
1134 .pr_domain = &ngdomain,
1135 .pr_protocol = NG_DATA,
1136 .pr_flags = PR_ATOMIC | PR_ADDR,
1137 .pr_usrreqs = &ngd_usrreqs
1138 }
1139 };
1140
1141 struct domain ngdomain = {
1142 .dom_family = AF_NETGRAPH,
1143 .dom_name = "netgraph",
1144 .dom_protosw = ngsw,
1145 .dom_protoswNPROTOSW = &ngsw[sizeof(ngsw) / sizeof(ngsw[0])]
1146 };
1147
1148 /*
1149 * Handle loading and unloading for this node type.
1150 * This is to handle auxiliary linkages (e.g protocol domain addition).
1151 */
1152 static int
1153 ngs_mod_event(module_t mod, int event, void *data)
1154 {
1155 int error = 0;
1156
1157 switch (event) {
1158 case MOD_LOAD:
1159 mtx_init(&ngsocketlist_mtx, "ng_socketlist", NULL, MTX_DEF);
1160 break;
1161 case MOD_UNLOAD:
1162 /* Ensure there are no open netgraph sockets. */
1163 if (!LIST_EMPTY(&ngsocklist)) {
1164 error = EBUSY;
1165 break;
1166 }
1167 #ifdef NOTYET
1168 /* Unregister protocol domain XXX can't do this yet.. */
1169 #endif
1170 error = EBUSY;
1171 break;
1172 default:
1173 error = EOPNOTSUPP;
1174 break;
1175 }
1176 return (error);
1177 }
1178
1179 VNET_DOMAIN_SET(ng);
1180
1181 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, SYSCTL_NULL_INT_PTR, AF_NETGRAPH, "");
1182 static SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA");
1183 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, SYSCTL_NULL_INT_PTR, NG_DATA, "");
1184 static SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL");
1185 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, SYSCTL_NULL_INT_PTR, NG_CONTROL, "");
1186
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