1
2 /*
3 * ng_socket.c
4 *
5 * Copyright (c) 1996-1999 Whistle Communications, Inc.
6 * All rights reserved.
7 *
8 * Subject to the following obligations and disclaimer of warranty, use and
9 * redistribution of this software, in source or object code forms, with or
10 * without modifications are expressly permitted by Whistle Communications;
11 * provided, however, that:
12 * 1. Any and all reproductions of the source or object code must include the
13 * copyright notice above and the following disclaimer of warranties; and
14 * 2. No rights are granted, in any manner or form, to use Whistle
15 * Communications, Inc. trademarks, including the mark "WHISTLE
16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
17 * such appears in the above copyright notice or in the software.
18 *
19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
35 * OF SUCH DAMAGE.
36 *
37 * Author: Julian Elischer <julian@freebsd.org>
38 *
39 * $FreeBSD$
40 * $Whistle: ng_socket.c,v 1.28 1999/11/01 09:24:52 julian Exp $
41 */
42
43 /*
44 * Netgraph socket nodes
45 *
46 * There are two types of netgraph sockets, control and data.
47 * Control sockets have a netgraph node, but data sockets are
48 * parasitic on control sockets, and have no node of their own.
49 */
50
51 #include <sys/param.h>
52 #include <sys/systm.h>
53 #include <sys/proc.h>
54 #include <sys/domain.h>
55 #include <sys/errno.h>
56 #include <sys/kernel.h>
57 #include <sys/filedesc.h>
58 #include <sys/malloc.h>
59 #include <sys/queue.h>
60 #include <sys/mbuf.h>
61 #include <sys/protosw.h>
62 #include <sys/socket.h>
63 #include <sys/socketvar.h>
64 #include <sys/sysctl.h>
65 #ifdef NOTYET
66 #include <sys/vnode.h>
67 #endif
68 #include <netgraph/ng_message.h>
69 #include <netgraph/netgraph.h>
70 #include <netgraph/ng_socketvar.h>
71 #include <netgraph/ng_socket.h>
72
73 /*
74 * It's Ascii-art time!
75 * +-------------+ +-------------+
76 * |socket (ctl)| |socket (data)|
77 * +-------------+ +-------------+
78 * ^ ^
79 * | |
80 * v v
81 * +-----------+ +-----------+
82 * |pcb (ctl)| |pcb (data)|
83 * +-----------+ +-----------+
84 * ^ ^
85 * | |
86 * v v
87 * +--------------------------+
88 * | Socket type private |
89 * | data |
90 * +--------------------------+
91 * ^
92 * |
93 * v
94 * +----------------+
95 * | struct ng_node |
96 * +----------------+
97 */
98
99 /* Netgraph node methods */
100 static ng_constructor_t ngs_constructor;
101 static ng_rcvmsg_t ngs_rcvmsg;
102 static ng_shutdown_t ngs_rmnode;
103 static ng_newhook_t ngs_newhook;
104 static ng_rcvdata_t ngs_rcvdata;
105 static ng_disconnect_t ngs_disconnect;
106
107 /* Internal methods */
108 static int ng_attach_data(struct socket *so);
109 static int ng_attach_cntl(struct socket *so);
110 static int ng_attach_common(struct socket *so, int type);
111 static void ng_detach_common(struct ngpcb *pcbp, int type);
112 /*static int ng_internalize(struct mbuf *m, struct proc *p); */
113
114 static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp);
115 static int ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp);
116 static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp);
117
118 static int ngs_mod_event(module_t mod, int event, void *data);
119 static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg,
120 struct sockaddr_ng *addr);
121
122 /* Netgraph type descriptor */
123 static struct ng_type typestruct = {
124 NG_VERSION,
125 NG_SOCKET_NODE_TYPE,
126 ngs_mod_event,
127 ngs_constructor,
128 ngs_rcvmsg,
129 ngs_rmnode,
130 ngs_newhook,
131 NULL,
132 NULL,
133 ngs_rcvdata,
134 ngs_rcvdata,
135 ngs_disconnect,
136 NULL
137 };
138 NETGRAPH_INIT(socket, &typestruct);
139
140 /* Buffer space */
141 static u_long ngpdg_sendspace = 2 * 1024; /* really max datagram size */
142 static u_long ngpdg_recvspace = 20 * 1024;
143
144 /* List of all sockets */
145 LIST_HEAD(, ngpcb) ngsocklist;
146
147 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb)
148
149 /* If getting unexplained errors returned, set this to "Debugger("X"); */
150 #ifndef TRAP_ERROR
151 #define TRAP_ERROR
152 #endif
153
154 /***************************************************************
155 Control sockets
156 ***************************************************************/
157
158 static int
159 ngc_attach(struct socket *so, int proto, struct proc *p)
160 {
161 struct ngpcb *const pcbp = sotongpcb(so);
162
163 if (suser(p->p_ucred, &p->p_acflag))
164 return (EPERM);
165 if (pcbp != NULL)
166 return (EISCONN);
167 return (ng_attach_cntl(so));
168 }
169
170 static int
171 ngc_detach(struct socket *so)
172 {
173 struct ngpcb *const pcbp = sotongpcb(so);
174
175 if (pcbp == NULL)
176 return (EINVAL);
177 ng_detach_common(pcbp, NG_CONTROL);
178 return (0);
179 }
180
181 static int
182 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
183 struct mbuf *control, struct proc *p)
184 {
185 struct ngpcb *const pcbp = sotongpcb(so);
186 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
187 struct ng_mesg *resp;
188 struct mbuf *m0;
189 char *msg, *path = NULL;
190 int len, error = 0;
191
192 if (pcbp == NULL) {
193 error = EINVAL;
194 goto release;
195 }
196 #ifdef NOTYET
197 if (control && (error = ng_internalize(control, p))) {
198 if (pcbp->sockdata == NULL) {
199 error = ENOTCONN;
200 goto release;
201 }
202 }
203 #else /* NOTYET */
204 if (control) {
205 error = EINVAL;
206 goto release;
207 }
208 #endif /* NOTYET */
209
210 /* Require destination as there may be >= 1 hooks on this node */
211 if (addr == NULL) {
212 error = EDESTADDRREQ;
213 goto release;
214 }
215
216 /* Allocate an expendable buffer for the path, chop off
217 * the sockaddr header, and make sure it's NUL terminated */
218 len = sap->sg_len - 2;
219 MALLOC(path, char *, len + 1, M_NETGRAPH, M_WAITOK);
220 if (path == NULL) {
221 error = ENOMEM;
222 goto release;
223 }
224 bcopy(sap->sg_data, path, len);
225 path[len] = '\0';
226
227 /* Move the actual message out of mbufs into a linear buffer.
228 * Start by adding up the size of the data. (could use mh_len?) */
229 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next)
230 len += m0->m_len;
231
232 /* Move the data into a linear buffer as well. Messages are not
233 * delivered in mbufs. */
234 MALLOC(msg, char *, len + 1, M_NETGRAPH, M_WAITOK);
235 if (msg == NULL) {
236 error = ENOMEM;
237 goto release;
238 }
239 m_copydata(m, 0, len, msg);
240
241 /* The callee will free the msg when done. The addr is our business. */
242 error = ng_send_msg(pcbp->sockdata->node,
243 (struct ng_mesg *) msg, path, &resp);
244
245 /* If the callee responded with a synchronous response, then put it
246 * back on the receive side of the socket; sap is source address. */
247 if (error == 0 && resp != NULL)
248 error = ship_msg(pcbp, resp, sap);
249
250 release:
251 if (path != NULL)
252 FREE(path, M_NETGRAPH);
253 if (control != NULL)
254 m_freem(control);
255 if (m != NULL)
256 m_freem(m);
257 return (error);
258 }
259
260 static int
261 ngc_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
262 {
263 struct ngpcb *const pcbp = sotongpcb(so);
264
265 if (pcbp == 0)
266 return (EINVAL);
267 return (ng_bind(nam, pcbp));
268 }
269
270 static int
271 ngc_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
272 {
273 struct ngpcb *const pcbp = sotongpcb(so);
274
275 if (pcbp == 0)
276 return (EINVAL);
277 return (ng_connect_cntl(nam, pcbp));
278 }
279
280 /***************************************************************
281 Data sockets
282 ***************************************************************/
283
284 static int
285 ngd_attach(struct socket *so, int proto, struct proc *p)
286 {
287 struct ngpcb *const pcbp = sotongpcb(so);
288
289 if (pcbp != NULL)
290 return (EISCONN);
291 return (ng_attach_data(so));
292 }
293
294 static int
295 ngd_detach(struct socket *so)
296 {
297 struct ngpcb *const pcbp = sotongpcb(so);
298
299 if (pcbp == NULL)
300 return (EINVAL);
301 ng_detach_common(pcbp, NG_DATA);
302 return (0);
303 }
304
305 static int
306 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
307 struct mbuf *control, struct proc *p)
308 {
309 struct ngpcb *const pcbp = sotongpcb(so);
310 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
311 meta_p mp = NULL;
312 int len, error;
313 hook_p hook = NULL;
314 char hookname[NG_HOOKLEN + 1];
315
316 if ((pcbp == NULL) || (control != NULL)) {
317 error = EINVAL;
318 goto release;
319 }
320 if (pcbp->sockdata == NULL) {
321 error = ENOTCONN;
322 goto release;
323 }
324 /*
325 * If the user used any of these ways to not specify an address
326 * then handle specially.
327 */
328 if ((sap == NULL)
329 || ((len = sap->sg_len) <= 2)
330 || (*sap->sg_data == '\0')) {
331 if (pcbp->sockdata->node->numhooks != 1) {
332 error = EDESTADDRREQ;
333 goto release;
334 }
335 /*
336 * if exactly one hook exists, just use it.
337 * Special case to allow write(2) to work on an ng_socket.
338 */
339 hook = LIST_FIRST(&pcbp->sockdata->node->hooks);
340 } else {
341 if (len > NG_HOOKLEN) {
342 error = EINVAL;
343 goto release;
344 }
345
346 /*
347 * chop off the sockaddr header, and make sure it's NUL
348 * terminated
349 */
350 bcopy(sap->sg_data, hookname, len);
351 hookname[len] = '\0';
352
353 /* Find the correct hook from 'hookname' */
354 LIST_FOREACH(hook, &pcbp->sockdata->node->hooks, hooks) {
355 if (strcmp(hookname, hook->name) == 0)
356 break;
357 }
358 if (hook == NULL)
359 error = EHOSTUNREACH;
360 }
361
362 /* Send data (OK if hook is NULL) */
363 NG_SEND_DATA(error, hook, m, mp); /* makes m NULL */
364
365 release:
366 if (control != NULL)
367 m_freem(control);
368 if (m != NULL)
369 m_freem(m);
370 return (error);
371 }
372
373 static int
374 ngd_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
375 {
376 struct ngpcb *const pcbp = sotongpcb(so);
377
378 if (pcbp == 0)
379 return (EINVAL);
380 return (ng_connect_data(nam, pcbp));
381 }
382
383 /*
384 * Used for both data and control sockets
385 */
386 static int
387 ng_setsockaddr(struct socket *so, struct sockaddr **addr)
388 {
389 struct ngpcb *pcbp;
390 struct sockaddr_ng *sg;
391 int sg_len, namelen, s;
392
393 /* Why isn't sg_data a `char[1]' ? :-( */
394 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1;
395
396 s = splnet();
397 pcbp = sotongpcb(so);
398 if ((pcbp == 0) || (pcbp->sockdata == NULL)) {
399 splx(s);
400 return (EINVAL);
401 }
402
403 namelen = 0; /* silence compiler ! */
404
405 if (pcbp->sockdata->node->name != NULL)
406 sg_len += namelen = strlen(pcbp->sockdata->node->name);
407
408 MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK);
409 bzero(sg, sg_len);
410
411 if (pcbp->sockdata->node->name != NULL)
412 bcopy(pcbp->sockdata->node->name, sg->sg_data, namelen);
413 splx(s);
414
415 sg->sg_len = sg_len;
416 sg->sg_family = AF_NETGRAPH;
417 *addr = (struct sockaddr *)sg;
418
419 return (0);
420 }
421
422 /*
423 * Attach a socket to it's protocol specific partner.
424 * For a control socket, actually create a netgraph node and attach
425 * to it as well.
426 */
427
428 static int
429 ng_attach_cntl(struct socket *so)
430 {
431 struct ngsock *privdata;
432 struct ngpcb *pcbp;
433 int error;
434
435 /* Setup protocol control block */
436 if ((error = ng_attach_common(so, NG_CONTROL)) != 0)
437 return (error);
438 pcbp = sotongpcb(so);
439
440 /* Allocate node private info */
441 MALLOC(privdata, struct ngsock *,
442 sizeof(*privdata), M_NETGRAPH, M_WAITOK);
443 if (privdata == NULL) {
444 ng_detach_common(pcbp, NG_CONTROL);
445 return (ENOMEM);
446 }
447 bzero(privdata, sizeof(*privdata));
448
449 /* Make the generic node components */
450 if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) {
451 FREE(privdata, M_NETGRAPH);
452 ng_detach_common(pcbp, NG_CONTROL);
453 return (error);
454 }
455 privdata->node->private = privdata;
456
457 /* Link the pcb and the node private data */
458 privdata->ctlsock = pcbp;
459 pcbp->sockdata = privdata;
460 privdata->refs++;
461 return (0);
462 }
463
464 static int
465 ng_attach_data(struct socket *so)
466 {
467 return(ng_attach_common(so, NG_DATA));
468 }
469
470 /*
471 * Set up a socket protocol control block.
472 * This code is shared between control and data sockets.
473 */
474 static int
475 ng_attach_common(struct socket *so, int type)
476 {
477 struct ngpcb *pcbp;
478 int error;
479
480 /* Standard socket setup stuff */
481 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace);
482 if (error)
483 return (error);
484
485 /* Allocate the pcb */
486 MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK);
487 if (pcbp == NULL)
488 return (ENOMEM);
489 bzero(pcbp, sizeof(*pcbp));
490 pcbp->type = type;
491
492 /* Link the pcb and the socket */
493 so->so_pcb = (caddr_t) pcbp;
494 pcbp->ng_socket = so;
495
496 /* Add the socket to linked list */
497 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks);
498 return (0);
499 }
500
501 /*
502 * Disassociate the socket from it's protocol specific
503 * partner. If it's attached to a node's private data structure,
504 * then unlink from that too. If we were the last socket attached to it,
505 * then shut down the entire node. Shared code for control and data sockets.
506 */
507 static void
508 ng_detach_common(struct ngpcb *pcbp, int which)
509 {
510 struct ngsock *sockdata;
511
512 if (pcbp->sockdata) {
513 sockdata = pcbp->sockdata;
514 pcbp->sockdata = NULL;
515 switch (which) {
516 case NG_CONTROL:
517 sockdata->ctlsock = NULL;
518 break;
519 case NG_DATA:
520 sockdata->datasock = NULL;
521 break;
522 default:
523 panic(__FUNCTION__);
524 }
525 if ((--sockdata->refs == 0) && (sockdata->node != NULL))
526 ng_rmnode(sockdata->node);
527 }
528 pcbp->ng_socket->so_pcb = NULL;
529 pcbp->ng_socket = NULL;
530 LIST_REMOVE(pcbp, socks);
531 FREE(pcbp, M_PCB);
532 }
533
534 #ifdef NOTYET
535 /*
536 * File descriptors can be passed into a AF_NETGRAPH socket.
537 * Note, that file descriptors cannot be passed OUT.
538 * Only character device descriptors are accepted.
539 * Character devices are useful to connect a graph to a device,
540 * which after all is the purpose of this whole system.
541 */
542 static int
543 ng_internalize(struct mbuf *control, struct proc *p)
544 {
545 struct filedesc *fdp = p->p_fd;
546 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
547 struct file *fp;
548 struct vnode *vn;
549 int oldfds;
550 int fd;
551
552 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET ||
553 cm->cmsg_len != control->m_len) {
554 TRAP_ERROR;
555 return (EINVAL);
556 }
557
558 /* Check there is only one FD. XXX what would more than one signify? */
559 oldfds = (cm->cmsg_len - sizeof(*cm)) / sizeof(int);
560 if (oldfds != 1) {
561 TRAP_ERROR;
562 return (EINVAL);
563 }
564
565 /* Check that the FD given is legit. and change it to a pointer to a
566 * struct file. */
567 fd = *(int *) (cm + 1);
568 if ((unsigned) fd >= fdp->fd_nfiles
569 || (fp = fdp->fd_ofiles[fd]) == NULL) {
570 return (EBADF);
571 }
572
573 /* Depending on what kind of resource it is, act differently. For
574 * devices, we treat it as a file. For a AF_NETGRAPH socket,
575 * shortcut straight to the node. */
576 switch (fp->f_type) {
577 case DTYPE_VNODE:
578 vn = (struct vnode *) fp->f_data;
579 if (vn && (vn->v_type == VCHR)) {
580 /* for a VCHR, actually reference the FILE */
581 fp->f_count++;
582 /* XXX then what :) */
583 /* how to pass on to other modules? */
584 } else {
585 TRAP_ERROR;
586 return (EINVAL);
587 }
588 break;
589 default:
590 TRAP_ERROR;
591 return (EINVAL);
592 }
593 return (0);
594 }
595 #endif /* NOTYET */
596
597 /*
598 * Connect the data socket to a named control socket node.
599 */
600 static int
601 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp)
602 {
603 struct sockaddr_ng *sap;
604 node_p farnode;
605 struct ngsock *sockdata;
606 int error;
607
608 /* If we are already connected, don't do it again */
609 if (pcbp->sockdata != NULL)
610 return (EISCONN);
611
612 /* Find the target (victim) and check it doesn't already have a data
613 * socket. Also check it is a 'socket' type node. */
614 sap = (struct sockaddr_ng *) nam;
615 if ((error = ng_path2node(NULL, sap->sg_data, &farnode, NULL)))
616 return (error);
617
618 if (strcmp(farnode->type->name, NG_SOCKET_NODE_TYPE) != 0)
619 return (EINVAL);
620 sockdata = farnode->private;
621 if (sockdata->datasock != NULL)
622 return (EADDRINUSE);
623
624 /* Link the PCB and the private data struct. and note the extra
625 * reference */
626 sockdata->datasock = pcbp;
627 pcbp->sockdata = sockdata;
628 sockdata->refs++;
629 return (0);
630 }
631
632 /*
633 * Connect the existing control socket node to a named node:hook.
634 * The hook we use on this end is the same name as the remote node name.
635 */
636 static int
637 ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp)
638 {
639 struct ngsock *const sockdata = pcbp->sockdata;
640 struct sockaddr_ng *sap;
641 char *node, *hook;
642 node_p farnode;
643 int rtn, error;
644
645 sap = (struct sockaddr_ng *) nam;
646 rtn = ng_path_parse(sap->sg_data, &node, NULL, &hook);
647 if (rtn < 0 || node == NULL || hook == NULL) {
648 TRAP_ERROR;
649 return (EINVAL);
650 }
651 farnode = ng_findname(sockdata->node, node);
652 if (farnode == NULL) {
653 TRAP_ERROR;
654 return (EADDRNOTAVAIL);
655 }
656
657 /* Connect, using a hook name the same as the far node name. */
658 error = ng_con_nodes(sockdata->node, node, farnode, hook);
659 return error;
660 }
661
662 /*
663 * Binding a socket means giving the corresponding node a name
664 */
665 static int
666 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
667 {
668 struct ngsock *const sockdata = pcbp->sockdata;
669 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
670
671 if (sockdata == NULL) {
672 TRAP_ERROR;
673 return (EINVAL);
674 }
675 if (sap->sg_len < 3 || sap->sg_data[sap->sg_len - 3] != '\0') {
676 TRAP_ERROR;
677 return (EINVAL);
678 }
679 return (ng_name_node(sockdata->node, sap->sg_data));
680 }
681
682 /*
683 * Take a message and pass it up to the control socket associated
684 * with the node.
685 */
686 static int
687 ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr)
688 {
689 struct socket *const so = pcbp->ng_socket;
690 struct mbuf *mdata;
691 int msglen;
692
693 /* Copy the message itself into an mbuf chain */
694 msglen = sizeof(struct ng_mesg) + msg->header.arglen;
695 mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL);
696
697 /* Here we free the message, as we are the end of the line.
698 * We need to do that regardless of whether we got mbufs. */
699 FREE(msg, M_NETGRAPH);
700
701 if (mdata == NULL) {
702 TRAP_ERROR;
703 return (ENOBUFS);
704 }
705
706 /* Send it up to the socket */
707 if (sbappendaddr(&so->so_rcv,
708 (struct sockaddr *) addr, mdata, NULL) == 0) {
709 TRAP_ERROR;
710 m_freem(mdata);
711 return (ENOBUFS);
712 }
713 sorwakeup(so);
714 return (0);
715 }
716
717 /*
718 * You can only create new nodes from the socket end of things.
719 */
720 static int
721 ngs_constructor(node_p *nodep)
722 {
723 return (EINVAL);
724 }
725
726 /*
727 * We allow any hook to be connected to the node.
728 * There is no per-hook private information though.
729 */
730 static int
731 ngs_newhook(node_p node, hook_p hook, const char *name)
732 {
733 hook->private = node->private;
734 return (0);
735 }
736
737 /*
738 * Incoming messages get passed up to the control socket.
739 * Unless they are for us specifically (socket_type)
740 */
741 static int
742 ngs_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr,
743 struct ng_mesg **resp)
744 {
745 struct ngsock *const sockdata = node->private;
746 struct ngpcb *const pcbp = sockdata->ctlsock;
747 struct sockaddr_ng *addr;
748 int addrlen;
749 int error = 0;
750
751 /* Only allow mesgs to be passed if we have the control socket.
752 * Data sockets can only support the generic messages. */
753 if (pcbp == NULL) {
754 TRAP_ERROR;
755 return (EINVAL);
756 }
757
758 if (msg->header.typecookie == NGM_SOCKET_COOKIE) {
759 switch (msg->header.cmd) {
760 case NGM_SOCK_CMD_NOLINGER:
761 sockdata->flags |= NGS_FLAG_NOLINGER;
762 break;
763 case NGM_SOCK_CMD_LINGER:
764 sockdata->flags &= ~NGS_FLAG_NOLINGER;
765 break;
766 default:
767 error = EINVAL; /* unknown command */
768 }
769 /* Free the message and return */
770 FREE(msg, M_NETGRAPH);
771 return(error);
772
773 }
774 /* Get the return address into a sockaddr */
775 if ((retaddr == NULL) || (*retaddr == '\0'))
776 retaddr = "";
777 addrlen = strlen(retaddr);
778 MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH, M_NOWAIT);
779 if (addr == NULL) {
780 TRAP_ERROR;
781 return (ENOMEM);
782 }
783 addr->sg_len = addrlen + 3;
784 addr->sg_family = AF_NETGRAPH;
785 bcopy(retaddr, addr->sg_data, addrlen);
786 addr->sg_data[addrlen] = '\0';
787
788 /* Send it up */
789 error = ship_msg(pcbp, msg, addr);
790 FREE(addr, M_NETGRAPH);
791 return (error);
792 }
793
794 /*
795 * Receive data on a hook
796 */
797 static int
798 ngs_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
799 {
800 struct ngsock *const sockdata = hook->node->private;
801 struct ngpcb *const pcbp = sockdata->datasock;
802 struct socket *so;
803 struct sockaddr_ng *addr;
804 char *addrbuf[NG_HOOKLEN + 1 + 4];
805 int addrlen;
806
807 /* If there is no data socket, black-hole it */
808 if (pcbp == NULL) {
809 NG_FREE_DATA(m, meta);
810 return (0);
811 }
812 so = pcbp->ng_socket;
813
814 /* Get the return address into a sockaddr. */
815 addrlen = strlen(hook->name); /* <= NG_HOOKLEN */
816 addr = (struct sockaddr_ng *) addrbuf;
817 addr->sg_len = addrlen + 3;
818 addr->sg_family = AF_NETGRAPH;
819 bcopy(hook->name, addr->sg_data, addrlen);
820 addr->sg_data[addrlen] = '\0';
821
822 /* We have no use for the meta data, free/clear it now. */
823 NG_FREE_META(meta);
824
825 /* Try to tell the socket which hook it came in on */
826 if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) {
827 m_freem(m);
828 TRAP_ERROR;
829 return (ENOBUFS);
830 }
831 sorwakeup(so);
832 return (0);
833 }
834
835 /*
836 * Hook disconnection
837 *
838 * For this type, removal of the last link destroys the node
839 * if the NOLINGER flag is set.
840 */
841 static int
842 ngs_disconnect(hook_p hook)
843 {
844 struct ngsock *const sockdata = hook->node->private;
845
846 if ((sockdata->flags & NGS_FLAG_NOLINGER )
847 && (hook->node->numhooks == 0)) {
848 ng_rmnode(hook->node);
849 }
850 return (0);
851 }
852
853 /*
854 * Do local shutdown processing.
855 * In this case, that involves making sure the socket
856 * knows we should be shutting down.
857 */
858 static int
859 ngs_rmnode(node_p node)
860 {
861 struct ngsock *const sockdata = node->private;
862 struct ngpcb *const dpcbp = sockdata->datasock;
863 struct ngpcb *const pcbp = sockdata->ctlsock;
864
865 ng_cutlinks(node);
866 ng_unname(node);
867
868 if (dpcbp != NULL) {
869 soisdisconnected(dpcbp->ng_socket);
870 dpcbp->sockdata = NULL;
871 sockdata->datasock = NULL;
872 sockdata->refs--;
873 }
874 if (pcbp != NULL) {
875 soisdisconnected(pcbp->ng_socket);
876 pcbp->sockdata = NULL;
877 sockdata->ctlsock = NULL;
878 sockdata->refs--;
879 }
880 node->private = NULL;
881 ng_unref(node);
882 FREE(sockdata, M_NETGRAPH);
883 return (0);
884 }
885
886 /*
887 * Control and data socket type descriptors
888 */
889
890 static struct pr_usrreqs ngc_usrreqs = {
891 NULL, /* abort */
892 pru_accept_notsupp,
893 ngc_attach,
894 ngc_bind,
895 ngc_connect,
896 pru_connect2_notsupp,
897 pru_control_notsupp,
898 ngc_detach,
899 NULL, /* disconnect */
900 pru_listen_notsupp,
901 NULL, /* setpeeraddr */
902 pru_rcvd_notsupp,
903 pru_rcvoob_notsupp,
904 ngc_send,
905 pru_sense_null,
906 NULL, /* shutdown */
907 ng_setsockaddr,
908 sosend,
909 soreceive,
910 sopoll
911 };
912
913 static struct pr_usrreqs ngd_usrreqs = {
914 NULL, /* abort */
915 pru_accept_notsupp,
916 ngd_attach,
917 NULL, /* bind */
918 ngd_connect,
919 pru_connect2_notsupp,
920 pru_control_notsupp,
921 ngd_detach,
922 NULL, /* disconnect */
923 pru_listen_notsupp,
924 NULL, /* setpeeraddr */
925 pru_rcvd_notsupp,
926 pru_rcvoob_notsupp,
927 ngd_send,
928 pru_sense_null,
929 NULL, /* shutdown */
930 ng_setsockaddr,
931 sosend,
932 soreceive,
933 sopoll
934 };
935
936 /*
937 * Definitions of protocols supported in the NETGRAPH domain.
938 */
939
940 extern struct domain ngdomain; /* stop compiler warnings */
941
942 static struct protosw ngsw[] = {
943 {
944 SOCK_DGRAM,
945 &ngdomain,
946 NG_CONTROL,
947 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */,
948 0, 0, 0, 0,
949 NULL,
950 0, 0, 0, 0,
951 &ngc_usrreqs
952 },
953 {
954 SOCK_DGRAM,
955 &ngdomain,
956 NG_DATA,
957 PR_ATOMIC | PR_ADDR,
958 0, 0, 0, 0,
959 NULL,
960 0, 0, 0, 0,
961 &ngd_usrreqs
962 }
963 };
964
965 struct domain ngdomain = {
966 AF_NETGRAPH,
967 "netgraph",
968 0,
969 NULL,
970 NULL,
971 ngsw,
972 &ngsw[sizeof(ngsw) / sizeof(ngsw[0])],
973 0,
974 NULL,
975 0,
976 0
977 };
978
979 /*
980 * Handle loading and unloading for this node type
981 * This is to handle auxiliary linkages (e.g protocol domain addition).
982 */
983 static int
984 ngs_mod_event(module_t mod, int event, void *data)
985 {
986 int error = 0;
987
988 switch (event) {
989 case MOD_LOAD:
990 /* Register protocol domain */
991 error = net_add_domain(&ngdomain);
992 break;
993 case MOD_UNLOAD:
994 /* Insure there are no open netgraph sockets */
995 if (!LIST_EMPTY(&ngsocklist)) {
996 error = EBUSY;
997 break;
998 }
999
1000 #ifdef NOTYET
1001 /* Unregister protocol domain XXX can't do this yet.. */
1002 if ((error = net_rm_domain(&ngdomain)) != 0)
1003 break;
1004 #else
1005 error = EBUSY;
1006 #endif
1007 break;
1008 default:
1009 error = EOPNOTSUPP;
1010 break;
1011 }
1012 return (error);
1013 }
1014
1015 SYSCTL_NODE(_net, AF_NETGRAPH, graph, CTLFLAG_RW, 0, "netgraph Family");
1016 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, "");
1017 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA");
1018 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, "");
1019 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL");
1020 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, "");
1021
Cache object: f602a4923462290a91127ee05c7df124
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