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: head/sys/netgraph/ng_socket.c 111119 2003-02-19 05:47:46Z imp $
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/domain.h>
53#include <sys/errno.h>
54#include <sys/kernel.h>
55#include <sys/lock.h>
56#include <sys/malloc.h>
57#include <sys/mbuf.h>
58#include <sys/protosw.h>
59#include <sys/queue.h>
60#include <sys/signalvar.h>
61#include <sys/socket.h>
62#include <sys/socketvar.h>
63#include <sys/sx.h>
64#include <sys/sysctl.h>
65#include <sys/systm.h>
66#ifdef NOTYET
67#include <sys/vnode.h>
68#endif
69#include <netgraph/ng_message.h>
70#include <netgraph/netgraph.h>
71#include <netgraph/ng_socketvar.h>
72#include <netgraph/ng_socket.h>
73
74#ifdef NG_SEPARATE_MALLOC
75MALLOC_DEFINE(M_NETGRAPH_PATH, "netgraph_path", "netgraph path info ");
76MALLOC_DEFINE(M_NETGRAPH_SOCK, "netgraph_sock", "netgraph socket info ");
77#else
78#define M_NETGRAPH_PATH M_NETGRAPH
79#define M_NETGRAPH_SOCK M_NETGRAPH
80#endif
81
82/*
83 * It's Ascii-art time!
84 * +-------------+ +-------------+
85 * |socket (ctl)| |socket (data)|
86 * +-------------+ +-------------+
87 * ^ ^
88 * | |
89 * v v
90 * +-----------+ +-----------+
91 * |pcb (ctl)| |pcb (data)|
92 * +-----------+ +-----------+
93 * ^ ^
94 * | |
95 * v v
96 * +--------------------------+
97 * | Socket type private |
98 * | data |
99 * +--------------------------+
100 * ^
101 * |
102 * v
103 * +----------------+
104 * | struct ng_node |
105 * +----------------+
106 */
107
108/* Netgraph node methods */
109static ng_constructor_t ngs_constructor;
110static ng_rcvmsg_t ngs_rcvmsg;
111static ng_shutdown_t ngs_shutdown;
112static ng_newhook_t ngs_newhook;
113static ng_connect_t ngs_connect;
114static ng_rcvdata_t ngs_rcvdata;
115static ng_disconnect_t ngs_disconnect;
116
117/* Internal methods */
118static int ng_attach_data(struct socket *so);
119static int ng_attach_cntl(struct socket *so);
120static int ng_attach_common(struct socket *so, int type);
121static void ng_detach_common(struct ngpcb *pcbp, int type);
122/*static int ng_internalize(struct mbuf *m, struct thread *p); */
123
124static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp);
125static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp);
126
127static int ngs_mod_event(module_t mod, int event, void *data);
128static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg,
129 struct sockaddr_ng *addr);
130
131/* Netgraph type descriptor */
132static struct ng_type typestruct = {
133 NG_ABI_VERSION,
134 NG_SOCKET_NODE_TYPE,
135 ngs_mod_event,
136 ngs_constructor,
137 ngs_rcvmsg,
138 ngs_shutdown,
139 ngs_newhook,
140 NULL,
141 ngs_connect,
142 ngs_rcvdata,
143 ngs_disconnect,
144 NULL
145};
146NETGRAPH_INIT(socket, &typestruct);
147
148/* Buffer space */
149static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */
150static u_long ngpdg_recvspace = 20 * 1024;
151
152/* List of all sockets */
153static LIST_HEAD(, ngpcb) ngsocklist;
154
155#define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb)
156
157/* If getting unexplained errors returned, set this to "Debugger("X"); */
158#ifndef TRAP_ERROR
159#define TRAP_ERROR
160#endif
161
162/***************************************************************
163 Control sockets
164***************************************************************/
165
166static int
167ngc_attach(struct socket *so, int proto, struct thread *td)
168{
169 struct ngpcb *const pcbp = sotongpcb(so);
170
171 if (suser(td))
172 return (EPERM);
173 if (pcbp != NULL)
174 return (EISCONN);
175 return (ng_attach_cntl(so));
176}
177
178static int
179ngc_detach(struct socket *so)
180{
181 struct ngpcb *const pcbp = sotongpcb(so);
182
183 if (pcbp == NULL)
184 return (EINVAL);
185 ng_detach_common(pcbp, NG_CONTROL);
186 return (0);
187}
188
189static int
190ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
191 struct mbuf *control, struct thread *td)
192{
193 struct ngpcb *const pcbp = sotongpcb(so);
194 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
195 struct ng_mesg *msg;
196 struct mbuf *m0;
197 char *path = NULL;
198 int len, error = 0;
199
200 if (pcbp == NULL) {
201 error = EINVAL;
202 goto release;
203 }
204#ifdef NOTYET
205 if (control && (error = ng_internalize(control, td))) {
206 if (pcbp->sockdata == NULL) {
207 error = ENOTCONN;
208 goto release;
209 }
210 }
211#else /* NOTYET */
212 if (control) {
213 error = EINVAL;
214 goto release;
215 }
216#endif /* NOTYET */
217
218 /* Require destination as there may be >= 1 hooks on this node */
219 if (addr == NULL) {
220 error = EDESTADDRREQ;
221 goto release;
222 }
223
224 /* Allocate an expendable buffer for the path, chop off
225 * the sockaddr header, and make sure it's NUL terminated */
226 len = sap->sg_len - 2;
227 MALLOC(path, char *, len + 1, M_NETGRAPH_PATH, M_WAITOK);
228 if (path == NULL) {
229 error = ENOMEM;
230 goto release;
231 }
232 bcopy(sap->sg_data, path, len);
233 path[len] = '\0';
234
235 /* Move the actual message out of mbufs into a linear buffer.
236 * Start by adding up the size of the data. (could use mh_len?) */
237 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next)
238 len += m0->m_len;
239
240 /* Move the data into a linear buffer as well. Messages are not
241 * delivered in mbufs. */
242 MALLOC(msg, struct ng_mesg *, len + 1, M_NETGRAPH_MSG, M_WAITOK);
243 if (msg == NULL) {
244 error = ENOMEM;
245 goto release;
246 }
247 m_copydata(m, 0, len, (char *)msg);
248
249#ifdef TRACE_MESSAGES
250 do {
251 item_p item;
252 if ((item = ng_package_msg(msg)) == NULL) {
253 (msg) = NULL;
254 (error) = ENOMEM;
255printf("err=%d\n",error);
256 break;
257 }
258 if (((error) = ng_address_path((pcbp->sockdata->node), (item),
259 (path), (NULL))) == 0) {
260printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n",
261item->el_dest->nd_ID,
262msg->header.typecookie,
263msg->header.cmd,
264msg->header.cmdstr,
265msg->header.flags,
266msg->header.token,
267item->el_dest->nd_type->name);
268 SAVE_LINE(item);
269 (error) = ng_snd_item((item), 0);
270 }
271else {
272printf("errx=%d\n",error);
273}
274 (msg) = NULL;
275 } while (0);
276
277#else
278 /* The callee will free the msg when done. The path is our business. */
279 NG_SEND_MSG_PATH(error, pcbp->sockdata->node, msg, path, 0);
280#endif
281release:
282 if (path != NULL)
283 FREE(path, M_NETGRAPH_PATH);
284 if (control != NULL)
285 m_freem(control);
286 if (m != NULL)
287 m_freem(m);
288 return (error);
289}
290
291static int
292ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
293{
294 struct ngpcb *const pcbp = sotongpcb(so);
295
296 if (pcbp == 0)
297 return (EINVAL);
298 return (ng_bind(nam, pcbp));
299}
300
301static int
302ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
303{
304printf(" program tried to connect control socket to remote node\n ");
305 /*
306 * At this time refuse to do this.. it used to
307 * do something but it was undocumented and not used.
308 */
309 return (EINVAL);
310}
311
312/***************************************************************
313 Data sockets
314***************************************************************/
315
316static int
317ngd_attach(struct socket *so, int proto, struct thread *td)
318{
319 struct ngpcb *const pcbp = sotongpcb(so);
320
321 if (pcbp != NULL)
322 return (EISCONN);
323 return (ng_attach_data(so));
324}
325
326static int
327ngd_detach(struct socket *so)
328{
329 struct ngpcb *const pcbp = sotongpcb(so);
330
331 if (pcbp == NULL)
332 return (EINVAL);
333 ng_detach_common(pcbp, NG_DATA);
334 return (0);
335}
336
337static int
338ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
339 struct mbuf *control, struct thread *td)
340{
341 struct ngpcb *const pcbp = sotongpcb(so);
342 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
343 int len, error;
344 hook_p hook = NULL;
345 char hookname[NG_HOOKLEN + 1];
346
347 if ((pcbp == NULL) || (control != NULL)) {
348 error = EINVAL;
349 goto release;
350 }
351 if (pcbp->sockdata == NULL) {
352 error = ENOTCONN;
353 goto release;
354 }
355 /*
356 * If the user used any of these ways to not specify an address
357 * then handle specially.
358 */
359 if ((sap == NULL)
360 || ((len = sap->sg_len - 2) <= 0)
361 || (*sap->sg_data == '\0')) {
362 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) {
363 error = EDESTADDRREQ;
364 goto release;
365 }
366 /*
367 * if exactly one hook exists, just use it.
368 * Special case to allow write(2) to work on an ng_socket.
369 */
370 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks);
371 } else {
372 if (len > NG_HOOKLEN) {
373 error = EINVAL;
374 goto release;
375 }
376
377 /*
378 * chop off the sockaddr header, and make sure it's NUL
379 * terminated
380 */
381 bcopy(sap->sg_data, hookname, len);
382 hookname[len] = '\0';
383
384 /* Find the correct hook from 'hookname' */
385 LIST_FOREACH(hook, &pcbp->sockdata->node->nd_hooks, hk_hooks) {
386 if (strcmp(hookname, NG_HOOK_NAME(hook)) == 0) {
387 break;
388 }
389 }
390 if (hook == NULL) {
391 error = EHOSTUNREACH;
392 }
393 }
394
395 /* Send data (OK if hook is NULL) */
396 NG_SEND_DATA_ONLY(error, hook, m); /* makes m NULL */
397
398release:
399 if (control != NULL)
400 m_freem(control);
401 if (m != NULL)
402 m_freem(m);
403 return (error);
404}
405
406static int
407ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
408{
409 struct ngpcb *const pcbp = sotongpcb(so);
410
411 if (pcbp == 0)
412 return (EINVAL);
413 return (ng_connect_data(nam, pcbp));
414}
415
416/*
417 * Used for both data and control sockets
418 */
419static int
420ng_setsockaddr(struct socket *so, struct sockaddr **addr)
421{
422 struct ngpcb *pcbp;
423 struct sockaddr_ng *sg;
424 int sg_len, namelen, s;
425
426 /* Why isn't sg_data a `char[1]' ? :-( */
427 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1;
428
429 s = splnet();
430 pcbp = sotongpcb(so);
431 if ((pcbp == NULL) || (pcbp->sockdata == NULL)) {
432 splx(s);
433 return (EINVAL);
434 }
435
436 namelen = 0; /* silence compiler ! */
437 if ( NG_NODE_HAS_NAME(pcbp->sockdata->node))
438 sg_len += namelen = strlen(NG_NODE_NAME(pcbp->sockdata->node));
439
440 MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK | M_ZERO);
441
442 if (NG_NODE_HAS_NAME(pcbp->sockdata->node))
443 bcopy(NG_NODE_NAME(pcbp->sockdata->node), sg->sg_data, namelen);
444 splx(s);
445
446 sg->sg_len = sg_len;
447 sg->sg_family = AF_NETGRAPH;
448 *addr = (struct sockaddr *)sg;
449
450 return (0);
451}
452
453/*
454 * Attach a socket to it's protocol specific partner.
455 * For a control socket, actually create a netgraph node and attach
456 * to it as well.
457 */
458
459static int
460ng_attach_cntl(struct socket *so)
461{
462 struct ngsock *privdata;
463 struct ngpcb *pcbp;
464 int error;
465
466 /* Setup protocol control block */
467 if ((error = ng_attach_common(so, NG_CONTROL)) != 0)
468 return (error);
469 pcbp = sotongpcb(so);
470
471 /* Allocate node private info */
472 MALLOC(privdata, struct ngsock *,
473 sizeof(*privdata), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO);
474 if (privdata == NULL) {
475 ng_detach_common(pcbp, NG_CONTROL);
476 return (ENOMEM);
477 }
478
479 /* Make the generic node components */
480 if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) {
481 FREE(privdata, M_NETGRAPH_SOCK);
482 ng_detach_common(pcbp, NG_CONTROL);
483 return (error);
484 }
485 NG_NODE_SET_PRIVATE(privdata->node, privdata);
486
487 /* Link the pcb and the node private data */
488 privdata->ctlsock = pcbp;
489 pcbp->sockdata = privdata;
490 privdata->refs++;
491 return (0);
492}
493
494static int
495ng_attach_data(struct socket *so)
496{
497 return(ng_attach_common(so, NG_DATA));
498}
499
500/*
501 * Set up a socket protocol control block.
502 * This code is shared between control and data sockets.
503 */
504static int
505ng_attach_common(struct socket *so, int type)
506{
507 struct ngpcb *pcbp;
508 int error;
509
510 /* Standard socket setup stuff */
511 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace);
512 if (error)
513 return (error);
514
515 /* Allocate the pcb */
516 MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO);
517 if (pcbp == NULL)
518 return (ENOMEM);
519 pcbp->type = type;
520
521 /* Link the pcb and the socket */
522 so->so_pcb = (caddr_t) pcbp;
523 pcbp->ng_socket = so;
524
525 /* Add the socket to linked list */
526 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks);
527 return (0);
528}
529
530/*
531 * Disassociate the socket from it's protocol specific
532 * partner. If it's attached to a node's private data structure,
533 * then unlink from that too. If we were the last socket attached to it,
534 * then shut down the entire node. Shared code for control and data sockets.
535 */
536static void
537ng_detach_common(struct ngpcb *pcbp, int which)
538{
539 struct ngsock *priv;
540
541 if (pcbp->sockdata) {
542 priv = pcbp->sockdata;
543 pcbp->sockdata = NULL;
544 switch (which) {
545 case NG_CONTROL:
546 priv->ctlsock = NULL;
547 break;
548 case NG_DATA:
549 priv->datasock = NULL;
550 break;
551 default:
552 panic(__func__);
553 }
554 if ((--priv->refs == 0) && (priv->node != NULL))
555 ng_rmnode_self(priv->node);
556 }
557 pcbp->ng_socket->so_pcb = NULL;
558 pcbp->ng_socket = NULL;
559 LIST_REMOVE(pcbp, socks);
560 FREE(pcbp, M_PCB);
561}
562
563#ifdef NOTYET
564/*
565 * File descriptors can be passed into an AF_NETGRAPH socket.
566 * Note, that file descriptors cannot be passed OUT.
567 * Only character device descriptors are accepted.
568 * Character devices are useful to connect a graph to a device,
569 * which after all is the purpose of this whole system.
570 */
571static int
572ng_internalize(struct mbuf *control, struct thread *td)
573{
574 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *);
575 struct file *fp;
576 struct vnode *vn;
577 int oldfds;
578 int fd;
579
580 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET ||
581 cm->cmsg_len != control->m_len) {
582 TRAP_ERROR;
583 return (EINVAL);
584 }
585
586 /* Check there is only one FD. XXX what would more than one signify? */
587 oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int);
588 if (oldfds != 1) {
589 TRAP_ERROR;
590 return (EINVAL);
591 }
592
593 /* Check that the FD given is legit. and change it to a pointer to a
594 * struct file. */
595 fd = CMSG_DATA(cm);
596 if ((error = fget(td, fd, &fp)) != 0)
597 return (error);
598
599 /* Depending on what kind of resource it is, act differently. For
600 * devices, we treat it as a file. For an AF_NETGRAPH socket,
601 * shortcut straight to the node. */
602 switch (fp->f_type) {
603 case DTYPE_VNODE:
604 vn = fp->f_data;
605 if (vn && (vn->v_type == VCHR)) {
606 /* for a VCHR, actually reference the FILE */
607 fp->f_count++;
608 /* XXX then what :) */
609 /* how to pass on to other modules? */
610 } else {
611 fdrop(fp, td);
612 TRAP_ERROR;
613 return (EINVAL);
614 }
615 break;
616 default:
617 fdrop(fp, td);
618 TRAP_ERROR;
619 return (EINVAL);
620 }
621 fdrop(fp, td);
622 return (0);
623}
624#endif /* NOTYET */
625
626/*
627 * Connect the data socket to a named control socket node.
628 */
629static int
630ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp)
631{
632 struct sockaddr_ng *sap;
633 node_p farnode;
634 struct ngsock *priv;
635 int error;
636 item_p item;
637
638 /* If we are already connected, don't do it again */
639 if (pcbp->sockdata != NULL)
640 return (EISCONN);
641
642 /* Find the target (victim) and check it doesn't already have a data
643 * socket. Also check it is a 'socket' type node.
644 * Use ng_package_data() and address_path() to do this.
645 */
646
647 sap = (struct sockaddr_ng *) nam;
648 /* The item will hold the node reference */
649 item = ng_package_data(NULL, NULL);
650 if (item == NULL) {
651 return (ENOMEM);
652 }
653 if ((error = ng_address_path(NULL, item, sap->sg_data, 0)))
654 return (error); /* item is freed on failure */
655
656 /*
657 * Extract node from item and free item. Remember we now have
658 * a reference on the node. The item holds it for us.
659 * when we free the item we release the reference.
660 */
661 farnode = item->el_dest; /* shortcut */
662 if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) {
663 NG_FREE_ITEM(item); /* drop the reference to the node */
664 return (EINVAL);
665 }
666 priv = NG_NODE_PRIVATE(farnode);
667 if (priv->datasock != NULL) {
668 NG_FREE_ITEM(item); /* drop the reference to the node */
669 return (EADDRINUSE);
670 }
671
672 /*
673 * Link the PCB and the private data struct. and note the extra
674 * reference. Drop the extra reference on the node.
675 */
676 priv->datasock = pcbp;
677 pcbp->sockdata = priv;
678 priv->refs++; /* XXX possible race if it's being freed */
679 NG_FREE_ITEM(item); /* drop the reference to the node */
680 return (0);
681}
682
683/*
684 * Binding a socket means giving the corresponding node a name
685 */
686static int
687ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
688{
689 struct ngsock *const priv = pcbp->sockdata;
690 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
691
692 if (priv == NULL) {
693 TRAP_ERROR;
694 return (EINVAL);
695 }
696 if ((sap->sg_len < 4)
697 || (sap->sg_len > (NG_NODELEN + 3))
698 || (sap->sg_data[0] == '\0')
699 || (sap->sg_data[sap->sg_len - 3] != '\0')) {
700 TRAP_ERROR;
701 return (EINVAL);
702 }
703 return (ng_name_node(priv->node, sap->sg_data));
704}
705
706/*
707 * Take a message and pass it up to the control socket associated
708 * with the node.
709 */
710static int
711ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr)
712{
713 struct socket *const so = pcbp->ng_socket;
714 struct mbuf *mdata;
715 int msglen;
716
717 /* Copy the message itself into an mbuf chain */
718 msglen = sizeof(struct ng_mesg) + msg->header.arglen;
719 mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL);
720
721 /* Here we free the message, as we are the end of the line.
722 * We need to do that regardless of whether we got mbufs. */
723 NG_FREE_MSG(msg);
724
725 if (mdata == NULL) {
726 TRAP_ERROR;
727 return (ENOBUFS);
728 }
729
730 /* Send it up to the socket */
731 if (sbappendaddr(&so->so_rcv,
732 (struct sockaddr *) addr, mdata, NULL) == 0) {
733 TRAP_ERROR;
734 m_freem(mdata);
735 return (ENOBUFS);
736 }
737 sorwakeup(so);
738 return (0);
739}
740
741/*
742 * You can only create new nodes from the socket end of things.
743 */
744static int
745ngs_constructor(node_p nodep)
746{
747 return (EINVAL);
748}
749
750/*
751 * We allow any hook to be connected to the node.
752 * There is no per-hook private information though.
753 */
754static int
755ngs_newhook(node_p node, hook_p hook, const char *name)
756{
757 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node));
758 return (0);
759}
760
761/*
762 * if only one hook, allow read(2) and write(2) to work.
763 */
764static int
765ngs_connect(hook_p hook)
766{
767 node_p node = NG_HOOK_NODE(hook);
768 struct ngsock *priv = NG_NODE_PRIVATE(node);
769
770 if ((priv->datasock)
771 && (priv->datasock->ng_socket)) {
772 if (NG_NODE_NUMHOOKS(node) == 1) {
773 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
774 } else {
775 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
776 }
777 }
778 return (0);
779}
780
781/*
782 * Incoming messages get passed up to the control socket.
783 * Unless they are for us specifically (socket_type)
784 */
785static int
786ngs_rcvmsg(node_p node, item_p item, hook_p lasthook)
787{
788 struct ngsock *const priv = NG_NODE_PRIVATE(node);
789 struct ngpcb *const pcbp = priv->ctlsock;
790 struct sockaddr_ng *addr;
791 int addrlen;
792 int error = 0;
793 struct ng_mesg *msg;
794 ng_ID_t retaddr = NGI_RETADDR(item);
795 char retabuf[32];
796
797 NGI_GET_MSG(item, msg);
798 NG_FREE_ITEM(item); /* we have all we need */
799
800 /* Only allow mesgs to be passed if we have the control socket.
801 * Data sockets can only support the generic messages. */
802 if (pcbp == NULL) {
803 TRAP_ERROR;
804 return (EINVAL);
805 }
806#ifdef TRACE_MESSAGES
807printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n",
808retaddr,
809msg->header.typecookie,
810msg->header.cmd,
811msg->header.cmdstr,
812msg->header.flags,
813msg->header.token);
814
815#endif
816
817 if (msg->header.typecookie == NGM_SOCKET_COOKIE) {
818 switch (msg->header.cmd) {
819 case NGM_SOCK_CMD_NOLINGER:
820 priv->flags |= NGS_FLAG_NOLINGER;
821 break;
822 case NGM_SOCK_CMD_LINGER:
823 priv->flags &= ~NGS_FLAG_NOLINGER;
824 break;
825 default:
826 error = EINVAL; /* unknown command */
827 }
828 /* Free the message and return */
829 NG_FREE_MSG(msg);
830 return(error);
831
832 }
833 /* Get the return address into a sockaddr */
834 sprintf(retabuf,"[%x]:", retaddr);
835 addrlen = strlen(retabuf);
836 MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH_PATH, M_NOWAIT);
837 if (addr == NULL) {
838 TRAP_ERROR;
839 return (ENOMEM);
840 }
841 addr->sg_len = addrlen + 3;
842 addr->sg_family = AF_NETGRAPH;
843 bcopy(retabuf, addr->sg_data, addrlen);
844 addr->sg_data[addrlen] = '\0';
845
846 /* Send it up */
847 error = ship_msg(pcbp, msg, addr);
848 FREE(addr, M_NETGRAPH_PATH);
849 return (error);
850}
851
852/*
853 * Receive data on a hook
854 */
855static int
856ngs_rcvdata(hook_p hook, item_p item)
857{
858 struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
859 struct ngpcb *const pcbp = priv->datasock;
860 struct socket *so;
861 struct sockaddr_ng *addr;
862 char *addrbuf[NG_HOOKLEN + 1 + 4];
863 int addrlen;
864 struct mbuf *m;
865
866 NGI_GET_M(item, m);
867 NG_FREE_ITEM(item);
868 /* If there is no data socket, black-hole it */
869 if (pcbp == NULL) {
870 NG_FREE_M(m);
871 return (0);
872 }
873 so = pcbp->ng_socket;
874
875 /* Get the return address into a sockaddr. */
876 addrlen = strlen(NG_HOOK_NAME(hook)); /* <= NG_HOOKLEN */
877 addr = (struct sockaddr_ng *) addrbuf;
878 addr->sg_len = addrlen + 3;
879 addr->sg_family = AF_NETGRAPH;
880 bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen);
881 addr->sg_data[addrlen] = '\0';
882
883 /* Try to tell the socket which hook it came in on */
884 if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) {
885 m_freem(m);
886 TRAP_ERROR;
887 return (ENOBUFS);
888 }
889 sorwakeup(so);
890 return (0);
891}
892
893/*
894 * Hook disconnection
895 *
896 * For this type, removal of the last link destroys the node
897 * if the NOLINGER flag is set.
898 */
899static int
900ngs_disconnect(hook_p hook)
901{
902 node_p node = NG_HOOK_NODE(hook);
903 struct ngsock *const priv = NG_NODE_PRIVATE(node);
904
905 if ((priv->datasock)
906 && (priv->datasock->ng_socket)) {
907 if (NG_NODE_NUMHOOKS(node) == 1) {
908 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
909 } else {
910 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
911 }
912 }
913
914 if ((priv->flags & NGS_FLAG_NOLINGER )
915 && (NG_NODE_NUMHOOKS(node) == 0)
916 && (NG_NODE_IS_VALID(node))) {
917 ng_rmnode_self(node);
918 }
919 return (0);
920}
921
922/*
923 * Do local shutdown processing.
924 * In this case, that involves making sure the socket
925 * knows we should be shutting down.
926 */
927static int
928ngs_shutdown(node_p node)
929{
930 struct ngsock *const priv = NG_NODE_PRIVATE(node);
931 struct ngpcb *const dpcbp = priv->datasock;
932 struct ngpcb *const pcbp = priv->ctlsock;
933
934 if (dpcbp != NULL) {
935 soisdisconnected(dpcbp->ng_socket);
936 dpcbp->sockdata = NULL;
937 priv->datasock = NULL;
938 priv->refs--;
939 }
940 if (pcbp != NULL) {
941 soisdisconnected(pcbp->ng_socket);
942 pcbp->sockdata = NULL;
943 priv->ctlsock = NULL;
944 priv->refs--;
945 }
946 NG_NODE_SET_PRIVATE(node, NULL);
947 NG_NODE_UNREF(node);
948 FREE(priv, M_NETGRAPH_SOCK);
949 return (0);
950}
951
952static int
953dummy_disconnect(struct socket *so)
954{
955 return (0);
956}
957/*
958 * Control and data socket type descriptors
959 */
960
961static struct pr_usrreqs ngc_usrreqs = {
962 NULL, /* abort */
963 pru_accept_notsupp,
964 ngc_attach,
965 ngc_bind,
966 ngc_connect,
967 pru_connect2_notsupp,
968 pru_control_notsupp,
969 ngc_detach,
970 dummy_disconnect, /* disconnect */
971 pru_listen_notsupp,
972 NULL, /* setpeeraddr */
973 pru_rcvd_notsupp,
974 pru_rcvoob_notsupp,
975 ngc_send,
976 pru_sense_null,
977 NULL, /* shutdown */
978 ng_setsockaddr,
979 sosend,
980 soreceive,
981 sopoll
982};
983
984static struct pr_usrreqs ngd_usrreqs = {
985 NULL, /* abort */
986 pru_accept_notsupp,
987 ngd_attach,
988 NULL, /* bind */
989 ngd_connect,
990 pru_connect2_notsupp,
991 pru_control_notsupp,
992 ngd_detach,
993 dummy_disconnect, /* disconnect */
994 pru_listen_notsupp,
995 NULL, /* setpeeraddr */
996 pru_rcvd_notsupp,
997 pru_rcvoob_notsupp,
998 ngd_send,
999 pru_sense_null,
1000 NULL, /* shutdown */
1001 ng_setsockaddr,
1002 sosend,
1003 soreceive,
1004 sopoll
1005};
1006
1007/*
1008 * Definitions of protocols supported in the NETGRAPH domain.
1009 */
1010
1011extern struct domain ngdomain; /* stop compiler warnings */
1012
1013static struct protosw ngsw[] = {
1014 {
1015 SOCK_DGRAM, /* protocol type */
1016 &ngdomain, /* backpointer to domain */
1017 NG_CONTROL,
1018 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, /* flags */
1019 0, 0, 0, 0, /* input, output, ctlinput, ctloutput */
1020 NULL, /* ousrreq */
1021 0, 0, 0, 0, /* init, fasttimeo, slowtimo, drain */
1022 &ngc_usrreqs, /* usrreq table (above) */
1023 /*{NULL}*/ /* pffh (protocol filter head?) */
1024 },
1025 {
1026 SOCK_DGRAM, /* protocol type */
1027 &ngdomain, /* backpointer to domain */
1028 NG_DATA,
1029 PR_ATOMIC | PR_ADDR, /* flags */
1030 0, 0, 0, 0, /* input, output, ctlinput, ctloutput */
1031 NULL, /* ousrreq() */
1032 0, 0, 0, 0, /* init, fasttimeo, slowtimo, drain */
1033 &ngd_usrreqs, /* usrreq table (above) */
1034 /*{NULL}*/ /* pffh (protocol filter head?) */
1035 }
1036};
1037
1038struct domain ngdomain = {
1039 AF_NETGRAPH,
1040 "netgraph",
1041 NULL, /* init() */
1042 NULL, /* externalise() */
1043 NULL, /* dispose() */
1044 ngsw, /* protosw entry */
1045 &ngsw[sizeof(ngsw) / sizeof(ngsw[0])], /* Number of protosw entries */
1046 NULL, /* next domain in list */
1047 NULL, /* rtattach() */
1048 0, /* arg to rtattach in bits */
1049 0 /* maxrtkey */
1050};
1051
1052/*
1053 * Handle loading and unloading for this node type
1054 * This is to handle auxiliary linkages (e.g protocol domain addition).
1055 */
1056static int
1057ngs_mod_event(module_t mod, int event, void *data)
1058{
1059 int error = 0;
1060
1061 switch (event) {
1062 case MOD_LOAD:
1063 /* Register protocol domain */
1064 net_add_domain(&ngdomain);
1065 break;
1066 case MOD_UNLOAD:
1067 /* Insure there are no open netgraph sockets */
1068 if (!LIST_EMPTY(&ngsocklist)) {
1069 error = EBUSY;
1070 break;
1071 }
1072
1073#ifdef NOTYET
1074 if ((LIST_EMPTY(&ngsocklist)) && (typestruct.refs == 0)) {
1075 /* Unregister protocol domain XXX can't do this yet.. */
1076 if ((error = net_rm_domain(&ngdomain)) != 0)
1077 break;
1078 } else
1079#endif
1080 error = EBUSY;
1081 break;
1082 default:
1083 error = EOPNOTSUPP;
1084 break;
1085 }
1086 return (error);
1087}
1088
1089SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, "");
1090SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA");
1091SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, "");
1092SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL");
1093SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, "");
1094