Once we distribute socket protocol processing requests to different
[dragonfly.git] / sys / netgraph / socket / ng_socket.c
CommitLineData
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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: src/sys/netgraph/ng_socket.c,v 1.11.2.6 2002/07/02 22:17:18 archie Exp $
e4700d00 40 * $DragonFly: src/sys/netgraph/socket/ng_socket.c,v 1.6 2004/03/05 16:57:15 hsu Exp $
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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/systm.h>
54#include <sys/proc.h>
55#include <sys/domain.h>
56#include <sys/errno.h>
57#include <sys/kernel.h>
58#include <sys/filedesc.h>
59#include <sys/malloc.h>
60#include <sys/queue.h>
61#include <sys/mbuf.h>
62#include <sys/protosw.h>
63#include <sys/socket.h>
64#include <sys/socketvar.h>
65#include <sys/sysctl.h>
66#ifdef NOTYET
67#include <sys/vnode.h>
68#endif
69#include <netgraph/ng_message.h>
70#include <netgraph/netgraph.h>
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71#include "ng_socketvar.h"
72#include "ng_socket.h"
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73
74/*
75 * It's Ascii-art time!
76 * +-------------+ +-------------+
77 * |socket (ctl)| |socket (data)|
78 * +-------------+ +-------------+
79 * ^ ^
80 * | |
81 * v v
82 * +-----------+ +-----------+
83 * |pcb (ctl)| |pcb (data)|
84 * +-----------+ +-----------+
85 * ^ ^
86 * | |
87 * v v
88 * +--------------------------+
89 * | Socket type private |
90 * | data |
91 * +--------------------------+
92 * ^
93 * |
94 * v
95 * +----------------+
96 * | struct ng_node |
97 * +----------------+
98 */
99
100/* Netgraph node methods */
101static ng_constructor_t ngs_constructor;
102static ng_rcvmsg_t ngs_rcvmsg;
103static ng_shutdown_t ngs_rmnode;
104static ng_newhook_t ngs_newhook;
105static ng_rcvdata_t ngs_rcvdata;
106static ng_disconnect_t ngs_disconnect;
107
108/* Internal methods */
109static int ng_attach_data(struct socket *so);
110static int ng_attach_cntl(struct socket *so);
111static int ng_attach_common(struct socket *so, int type);
112static void ng_detach_common(struct ngpcb *pcbp, int type);
dadab5e9 113/*static int ng_internalize(struct mbuf *m, struct thread *td); */
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114
115static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp);
116static int ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp);
117static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp);
118
119static int ngs_mod_event(module_t mod, int event, void *data);
120static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg,
121 struct sockaddr_ng *addr);
122
123/* Netgraph type descriptor */
124static struct ng_type typestruct = {
125 NG_VERSION,
126 NG_SOCKET_NODE_TYPE,
127 ngs_mod_event,
128 ngs_constructor,
129 ngs_rcvmsg,
130 ngs_rmnode,
131 ngs_newhook,
132 NULL,
133 NULL,
134 ngs_rcvdata,
135 ngs_rcvdata,
136 ngs_disconnect,
137 NULL
138};
139NETGRAPH_INIT(socket, &typestruct);
140
141/* Buffer space */
142static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */
143static u_long ngpdg_recvspace = 20 * 1024;
144
145/* List of all sockets */
146LIST_HEAD(, ngpcb) ngsocklist;
147
148#define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb)
149
150/* If getting unexplained errors returned, set this to "Debugger("X"); */
151#ifndef TRAP_ERROR
152#define TRAP_ERROR
153#endif
154
155/***************************************************************
156 Control sockets
157***************************************************************/
158
159static int
e4700d00 160ngc_attach(struct socket *so, int proto, struct pru_attach_info *ai)
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161{
162 struct ngpcb *const pcbp = sotongpcb(so);
163
e4700d00 164 if (suser_cred(ai->p_ucred, NULL_CRED_OKAY) != 0)
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165 return (EPERM);
166 if (pcbp != NULL)
167 return (EISCONN);
168 return (ng_attach_cntl(so));
169}
170
171static int
172ngc_detach(struct socket *so)
173{
174 struct ngpcb *const pcbp = sotongpcb(so);
175
176 if (pcbp == NULL)
177 return (EINVAL);
178 ng_detach_common(pcbp, NG_CONTROL);
179 return (0);
180}
181
182static int
183ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
dadab5e9 184 struct mbuf *control, struct thread *td)
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185{
186 struct ngpcb *const pcbp = sotongpcb(so);
187 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
188 struct ng_mesg *resp;
189 struct mbuf *m0;
190 char *msg, *path = NULL;
191 int len, error = 0;
192
193 if (pcbp == NULL) {
194 error = EINVAL;
195 goto release;
196 }
197#ifdef NOTYET
198 if (control && (error = ng_internalize(control, p))) {
199 if (pcbp->sockdata == NULL) {
200 error = ENOTCONN;
201 goto release;
202 }
203 }
204#else /* NOTYET */
205 if (control) {
206 error = EINVAL;
207 goto release;
208 }
209#endif /* NOTYET */
210
211 /* Require destination as there may be >= 1 hooks on this node */
212 if (addr == NULL) {
213 error = EDESTADDRREQ;
214 goto release;
215 }
216
217 /* Allocate an expendable buffer for the path, chop off
218 * the sockaddr header, and make sure it's NUL terminated */
219 len = sap->sg_len - 2;
220 MALLOC(path, char *, len + 1, M_NETGRAPH, M_WAITOK);
221 if (path == NULL) {
222 error = ENOMEM;
223 goto release;
224 }
225 bcopy(sap->sg_data, path, len);
226 path[len] = '\0';
227
228 /* Move the actual message out of mbufs into a linear buffer.
229 * Start by adding up the size of the data. (could use mh_len?) */
230 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next)
231 len += m0->m_len;
232
233 /* Move the data into a linear buffer as well. Messages are not
234 * delivered in mbufs. */
235 MALLOC(msg, char *, len + 1, M_NETGRAPH, M_WAITOK);
236 if (msg == NULL) {
237 error = ENOMEM;
238 goto release;
239 }
240 m_copydata(m, 0, len, msg);
241
242 /* The callee will free the msg when done. The addr is our business. */
243 error = ng_send_msg(pcbp->sockdata->node,
244 (struct ng_mesg *) msg, path, &resp);
245
246 /* If the callee responded with a synchronous response, then put it
247 * back on the receive side of the socket; sap is source address. */
248 if (error == 0 && resp != NULL)
249 error = ship_msg(pcbp, resp, sap);
250
251release:
252 if (path != NULL)
253 FREE(path, M_NETGRAPH);
254 if (control != NULL)
255 m_freem(control);
256 if (m != NULL)
257 m_freem(m);
258 return (error);
259}
260
261static int
dadab5e9 262ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
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263{
264 struct ngpcb *const pcbp = sotongpcb(so);
265
266 if (pcbp == 0)
267 return (EINVAL);
268 return (ng_bind(nam, pcbp));
269}
270
271static int
dadab5e9 272ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
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273{
274 struct ngpcb *const pcbp = sotongpcb(so);
275
276 if (pcbp == 0)
277 return (EINVAL);
278 return (ng_connect_cntl(nam, pcbp));
279}
280
281/***************************************************************
282 Data sockets
283***************************************************************/
284
285static int
dadab5e9 286ngd_attach(struct socket *so, int proto, struct thread *td)
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287{
288 struct ngpcb *const pcbp = sotongpcb(so);
289
290 if (pcbp != NULL)
291 return (EISCONN);
292 return (ng_attach_data(so));
293}
294
295static int
296ngd_detach(struct socket *so)
297{
298 struct ngpcb *const pcbp = sotongpcb(so);
299
300 if (pcbp == NULL)
301 return (EINVAL);
302 ng_detach_common(pcbp, NG_DATA);
303 return (0);
304}
305
306static int
307ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
dadab5e9 308 struct mbuf *control, struct thread *td)
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309{
310 struct ngpcb *const pcbp = sotongpcb(so);
311 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
312 meta_p mp = NULL;
313 int len, error;
314 hook_p hook = NULL;
315 char hookname[NG_HOOKLEN + 1];
316
317 if ((pcbp == NULL) || (control != NULL)) {
318 error = EINVAL;
319 goto release;
320 }
321 if (pcbp->sockdata == NULL) {
322 error = ENOTCONN;
323 goto release;
324 }
325 /*
326 * If the user used any of these ways to not specify an address
327 * then handle specially.
328 */
329 if ((sap == NULL)
330 || ((len = sap->sg_len - 2) <= 0)
331 || (*sap->sg_data == '\0')) {
332 if (pcbp->sockdata->node->numhooks != 1) {
333 error = EDESTADDRREQ;
334 goto release;
335 }
336 /*
337 * if exactly one hook exists, just use it.
338 * Special case to allow write(2) to work on an ng_socket.
339 */
340 hook = LIST_FIRST(&pcbp->sockdata->node->hooks);
341 } else {
342 if (len > NG_HOOKLEN) {
343 error = EINVAL;
344 goto release;
345 }
346
347 /*
348 * chop off the sockaddr header, and make sure it's NUL
349 * terminated
350 */
351 bcopy(sap->sg_data, hookname, len);
352 hookname[len] = '\0';
353
354 /* Find the correct hook from 'hookname' */
355 LIST_FOREACH(hook, &pcbp->sockdata->node->hooks, hooks) {
356 if (strcmp(hookname, hook->name) == 0)
357 break;
358 }
359 if (hook == NULL)
360 error = EHOSTUNREACH;
361 }
362
363 /* Send data (OK if hook is NULL) */
364 NG_SEND_DATA(error, hook, m, mp); /* makes m NULL */
365
366release:
367 if (control != NULL)
368 m_freem(control);
369 if (m != NULL)
370 m_freem(m);
371 return (error);
372}
373
374static int
dadab5e9 375ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
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376{
377 struct ngpcb *const pcbp = sotongpcb(so);
378
379 if (pcbp == 0)
380 return (EINVAL);
381 return (ng_connect_data(nam, pcbp));
382}
383
384/*
385 * Used for both data and control sockets
386 */
387static int
388ng_setsockaddr(struct socket *so, struct sockaddr **addr)
389{
390 struct ngpcb *pcbp;
391 struct sockaddr_ng *sg;
392 int sg_len, namelen, s;
393
394 /* Why isn't sg_data a `char[1]' ? :-( */
395 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1;
396
397 s = splnet();
398 pcbp = sotongpcb(so);
399 if ((pcbp == 0) || (pcbp->sockdata == NULL)) {
400 splx(s);
401 return (EINVAL);
402 }
403
404 namelen = 0; /* silence compiler ! */
405
406 if (pcbp->sockdata->node->name != NULL)
407 sg_len += namelen = strlen(pcbp->sockdata->node->name);
408
409 MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK);
410 bzero(sg, sg_len);
411
412 if (pcbp->sockdata->node->name != NULL)
413 bcopy(pcbp->sockdata->node->name, sg->sg_data, namelen);
414 splx(s);
415
416 sg->sg_len = sg_len;
417 sg->sg_family = AF_NETGRAPH;
418 *addr = (struct sockaddr *)sg;
419
420 return (0);
421}
422
423/*
424 * Attach a socket to it's protocol specific partner.
425 * For a control socket, actually create a netgraph node and attach
426 * to it as well.
427 */
428
429static int
430ng_attach_cntl(struct socket *so)
431{
432 struct ngsock *privdata;
433 struct ngpcb *pcbp;
434 int error;
435
436 /* Setup protocol control block */
437 if ((error = ng_attach_common(so, NG_CONTROL)) != 0)
438 return (error);
439 pcbp = sotongpcb(so);
440
441 /* Allocate node private info */
442 MALLOC(privdata, struct ngsock *,
443 sizeof(*privdata), M_NETGRAPH, M_WAITOK);
444 if (privdata == NULL) {
445 ng_detach_common(pcbp, NG_CONTROL);
446 return (ENOMEM);
447 }
448 bzero(privdata, sizeof(*privdata));
449
450 /* Make the generic node components */
451 if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) {
452 FREE(privdata, M_NETGRAPH);
453 ng_detach_common(pcbp, NG_CONTROL);
454 return (error);
455 }
456 privdata->node->private = privdata;
457
458 /* Link the pcb and the node private data */
459 privdata->ctlsock = pcbp;
460 pcbp->sockdata = privdata;
461 privdata->refs++;
462 return (0);
463}
464
465static int
466ng_attach_data(struct socket *so)
467{
468 return(ng_attach_common(so, NG_DATA));
469}
470
471/*
472 * Set up a socket protocol control block.
473 * This code is shared between control and data sockets.
474 */
475static int
476ng_attach_common(struct socket *so, int type)
477{
478 struct ngpcb *pcbp;
479 int error;
480
481 /* Standard socket setup stuff */
e4700d00 482 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace, NULL);
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483 if (error)
484 return (error);
485
486 /* Allocate the pcb */
487 MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK);
488 if (pcbp == NULL)
489 return (ENOMEM);
490 bzero(pcbp, sizeof(*pcbp));
491 pcbp->type = type;
492
493 /* Link the pcb and the socket */
494 so->so_pcb = (caddr_t) pcbp;
495 pcbp->ng_socket = so;
496
497 /* Add the socket to linked list */
498 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks);
499 return (0);
500}
501
502/*
503 * Disassociate the socket from it's protocol specific
504 * partner. If it's attached to a node's private data structure,
505 * then unlink from that too. If we were the last socket attached to it,
506 * then shut down the entire node. Shared code for control and data sockets.
507 */
508static void
509ng_detach_common(struct ngpcb *pcbp, int which)
510{
511 struct ngsock *sockdata;
512
513 if (pcbp->sockdata) {
514 sockdata = pcbp->sockdata;
515 pcbp->sockdata = NULL;
516 switch (which) {
517 case NG_CONTROL:
518 sockdata->ctlsock = NULL;
519 break;
520 case NG_DATA:
521 sockdata->datasock = NULL;
522 break;
523 default:
524 panic(__FUNCTION__);
525 }
526 if ((--sockdata->refs == 0) && (sockdata->node != NULL))
527 ng_rmnode(sockdata->node);
528 }
529 pcbp->ng_socket->so_pcb = NULL;
530 pcbp->ng_socket = NULL;
531 LIST_REMOVE(pcbp, socks);
532 FREE(pcbp, M_PCB);
533}
534
535#ifdef NOTYET
536/*
537 * File descriptors can be passed into a AF_NETGRAPH socket.
538 * Note, that file descriptors cannot be passed OUT.
539 * Only character device descriptors are accepted.
540 * Character devices are useful to connect a graph to a device,
541 * which after all is the purpose of this whole system.
542 */
543static int
dadab5e9 544ng_internalize(struct mbuf *control, struct thread *td)
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545{
546 struct filedesc *fdp = p->p_fd;
547 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *);
548 struct file *fp;
549 struct vnode *vn;
550 int oldfds;
551 int fd;
552
553 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET ||
554 cm->cmsg_len != control->m_len) {
555 TRAP_ERROR;
556 return (EINVAL);
557 }
558
559 /* Check there is only one FD. XXX what would more than one signify? */
560 oldfds = (cm->cmsg_len - sizeof(*cm)) / sizeof(int);
561 if (oldfds != 1) {
562 TRAP_ERROR;
563 return (EINVAL);
564 }
565
566 /* Check that the FD given is legit. and change it to a pointer to a
567 * struct file. */
568 fd = *(int *) (cm + 1);
569 if ((unsigned) fd >= fdp->fd_nfiles
570 || (fp = fdp->fd_ofiles[fd]) == NULL) {
571 return (EBADF);
572 }
573
574 /* Depending on what kind of resource it is, act differently. For
575 * devices, we treat it as a file. For a AF_NETGRAPH socket,
576 * shortcut straight to the node. */
577 switch (fp->f_type) {
578 case DTYPE_VNODE:
579 vn = (struct vnode *) fp->f_data;
580 if (vn && (vn->v_type == VCHR)) {
581 /* for a VCHR, actually reference the FILE */
582 fp->f_count++;
583 /* XXX then what :) */
584 /* how to pass on to other modules? */
585 } else {
586 TRAP_ERROR;
587 return (EINVAL);
588 }
589 break;
590 default:
591 TRAP_ERROR;
592 return (EINVAL);
593 }
594 return (0);
595}
596#endif /* NOTYET */
597
598/*
599 * Connect the data socket to a named control socket node.
600 */
601static int
602ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp)
603{
604 struct sockaddr_ng *sap;
605 node_p farnode;
606 struct ngsock *sockdata;
607 int error;
608
609 /* If we are already connected, don't do it again */
610 if (pcbp->sockdata != NULL)
611 return (EISCONN);
612
613 /* Find the target (victim) and check it doesn't already have a data
614 * socket. Also check it is a 'socket' type node. */
615 sap = (struct sockaddr_ng *) nam;
616 if ((error = ng_path2node(NULL, sap->sg_data, &farnode, NULL)))
617 return (error);
618
619 if (strcmp(farnode->type->name, NG_SOCKET_NODE_TYPE) != 0)
620 return (EINVAL);
621 sockdata = farnode->private;
622 if (sockdata->datasock != NULL)
623 return (EADDRINUSE);
624
625 /* Link the PCB and the private data struct. and note the extra
626 * reference */
627 sockdata->datasock = pcbp;
628 pcbp->sockdata = sockdata;
629 sockdata->refs++;
630 return (0);
631}
632
633/*
634 * Connect the existing control socket node to a named node:hook.
635 * The hook we use on this end is the same name as the remote node name.
636 */
637static int
638ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp)
639{
640 struct ngsock *const sockdata = pcbp->sockdata;
641 struct sockaddr_ng *sap;
642 char *node, *hook;
643 node_p farnode;
644 int rtn, error;
645
646 sap = (struct sockaddr_ng *) nam;
647 rtn = ng_path_parse(sap->sg_data, &node, NULL, &hook);
648 if (rtn < 0 || node == NULL || hook == NULL) {
649 TRAP_ERROR;
650 return (EINVAL);
651 }
652 farnode = ng_findname(sockdata->node, node);
653 if (farnode == NULL) {
654 TRAP_ERROR;
655 return (EADDRNOTAVAIL);
656 }
657
658 /* Connect, using a hook name the same as the far node name. */
659 error = ng_con_nodes(sockdata->node, node, farnode, hook);
660 return error;
661}
662
663/*
664 * Binding a socket means giving the corresponding node a name
665 */
666static int
667ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
668{
669 struct ngsock *const sockdata = pcbp->sockdata;
670 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
671
672 if (sockdata == NULL) {
673 TRAP_ERROR;
674 return (EINVAL);
675 }
676 if (sap->sg_len < 3 || sap->sg_data[sap->sg_len - 3] != '\0') {
677 TRAP_ERROR;
678 return (EINVAL);
679 }
680 return (ng_name_node(sockdata->node, sap->sg_data));
681}
682
683/*
684 * Take a message and pass it up to the control socket associated
685 * with the node.
686 */
687static int
688ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr)
689{
690 struct socket *const so = pcbp->ng_socket;
691 struct mbuf *mdata;
692 int msglen;
693
694 /* Copy the message itself into an mbuf chain */
695 msglen = sizeof(struct ng_mesg) + msg->header.arglen;
696 mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL);
697
698 /* Here we free the message, as we are the end of the line.
699 * We need to do that regardless of whether we got mbufs. */
700 FREE(msg, M_NETGRAPH);
701
702 if (mdata == NULL) {
703 TRAP_ERROR;
704 return (ENOBUFS);
705 }
706
707 /* Send it up to the socket */
708 if (sbappendaddr(&so->so_rcv,
709 (struct sockaddr *) addr, mdata, NULL) == 0) {
710 TRAP_ERROR;
711 m_freem(mdata);
712 return (ENOBUFS);
713 }
714 sorwakeup(so);
715 return (0);
716}
717
718/*
719 * You can only create new nodes from the socket end of things.
720 */
721static int
722ngs_constructor(node_p *nodep)
723{
724 return (EINVAL);
725}
726
727/*
728 * We allow any hook to be connected to the node.
729 * There is no per-hook private information though.
730 */
731static int
732ngs_newhook(node_p node, hook_p hook, const char *name)
733{
734 hook->private = node->private;
735 return (0);
736}
737
738/*
739 * Incoming messages get passed up to the control socket.
740 * Unless they are for us specifically (socket_type)
741 */
742static int
743ngs_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr,
744 struct ng_mesg **resp)
745{
746 struct ngsock *const sockdata = node->private;
747 struct ngpcb *const pcbp = sockdata->ctlsock;
748 struct sockaddr_ng *addr;
749 int addrlen;
750 int error = 0;
751
752 /* Only allow mesgs to be passed if we have the control socket.
753 * Data sockets can only support the generic messages. */
754 if (pcbp == NULL) {
755 TRAP_ERROR;
756 return (EINVAL);
757 }
758
759 if (msg->header.typecookie == NGM_SOCKET_COOKIE) {
760 switch (msg->header.cmd) {
761 case NGM_SOCK_CMD_NOLINGER:
762 sockdata->flags |= NGS_FLAG_NOLINGER;
763 break;
764 case NGM_SOCK_CMD_LINGER:
765 sockdata->flags &= ~NGS_FLAG_NOLINGER;
766 break;
767 default:
768 error = EINVAL; /* unknown command */
769 }
770 /* Free the message and return */
771 FREE(msg, M_NETGRAPH);
772 return(error);
773
774 }
775 /* Get the return address into a sockaddr */
776 if ((retaddr == NULL) || (*retaddr == '\0'))
777 retaddr = "";
778 addrlen = strlen(retaddr);
779 MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH, M_NOWAIT);
780 if (addr == NULL) {
781 TRAP_ERROR;
782 return (ENOMEM);
783 }
784 addr->sg_len = addrlen + 3;
785 addr->sg_family = AF_NETGRAPH;
786 bcopy(retaddr, addr->sg_data, addrlen);
787 addr->sg_data[addrlen] = '\0';
788
789 /* Send it up */
790 error = ship_msg(pcbp, msg, addr);
791 FREE(addr, M_NETGRAPH);
792 return (error);
793}
794
795/*
796 * Receive data on a hook
797 */
798static int
799ngs_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
800{
801 struct ngsock *const sockdata = hook->node->private;
802 struct ngpcb *const pcbp = sockdata->datasock;
803 struct socket *so;
804 struct sockaddr_ng *addr;
805 char *addrbuf[NG_HOOKLEN + 1 + 4];
806 int addrlen;
807
808 /* If there is no data socket, black-hole it */
809 if (pcbp == NULL) {
810 NG_FREE_DATA(m, meta);
811 return (0);
812 }
813 so = pcbp->ng_socket;
814
815 /* Get the return address into a sockaddr. */
816 addrlen = strlen(hook->name); /* <= NG_HOOKLEN */
817 addr = (struct sockaddr_ng *) addrbuf;
818 addr->sg_len = addrlen + 3;
819 addr->sg_family = AF_NETGRAPH;
820 bcopy(hook->name, addr->sg_data, addrlen);
821 addr->sg_data[addrlen] = '\0';
822
823 /* We have no use for the meta data, free/clear it now. */
824 NG_FREE_META(meta);
825
826 /* Try to tell the socket which hook it came in on */
827 if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) {
828 m_freem(m);
829 TRAP_ERROR;
830 return (ENOBUFS);
831 }
832 sorwakeup(so);
833 return (0);
834}
835
836/*
837 * Hook disconnection
838 *
839 * For this type, removal of the last link destroys the node
840 * if the NOLINGER flag is set.
841 */
842static int
843ngs_disconnect(hook_p hook)
844{
845 struct ngsock *const sockdata = hook->node->private;
846
847 if ((sockdata->flags & NGS_FLAG_NOLINGER )
848 && (hook->node->numhooks == 0)) {
849 ng_rmnode(hook->node);
850 }
851 return (0);
852}
853
854/*
855 * Do local shutdown processing.
856 * In this case, that involves making sure the socket
857 * knows we should be shutting down.
858 */
859static int
860ngs_rmnode(node_p node)
861{
862 struct ngsock *const sockdata = node->private;
863 struct ngpcb *const dpcbp = sockdata->datasock;
864 struct ngpcb *const pcbp = sockdata->ctlsock;
865
866 ng_cutlinks(node);
867 ng_unname(node);
868
869 if (dpcbp != NULL) {
870 soisdisconnected(dpcbp->ng_socket);
871 dpcbp->sockdata = NULL;
872 sockdata->datasock = NULL;
873 sockdata->refs--;
874 }
875 if (pcbp != NULL) {
876 soisdisconnected(pcbp->ng_socket);
877 pcbp->sockdata = NULL;
878 sockdata->ctlsock = NULL;
879 sockdata->refs--;
880 }
881 node->private = NULL;
882 ng_unref(node);
883 FREE(sockdata, M_NETGRAPH);
884 return (0);
885}
886
887/*
888 * Control and data socket type descriptors
889 */
890
891static struct pr_usrreqs ngc_usrreqs = {
892 NULL, /* abort */
893 pru_accept_notsupp,
894 ngc_attach,
895 ngc_bind,
896 ngc_connect,
897 pru_connect2_notsupp,
898 pru_control_notsupp,
899 ngc_detach,
900 NULL, /* disconnect */
901 pru_listen_notsupp,
902 NULL, /* setpeeraddr */
903 pru_rcvd_notsupp,
904 pru_rcvoob_notsupp,
905 ngc_send,
906 pru_sense_null,
907 NULL, /* shutdown */
908 ng_setsockaddr,
909 sosend,
910 soreceive,
911 sopoll
912};
913
914static struct pr_usrreqs ngd_usrreqs = {
915 NULL, /* abort */
916 pru_accept_notsupp,
917 ngd_attach,
918 NULL, /* bind */
919 ngd_connect,
920 pru_connect2_notsupp,
921 pru_control_notsupp,
922 ngd_detach,
923 NULL, /* disconnect */
924 pru_listen_notsupp,
925 NULL, /* setpeeraddr */
926 pru_rcvd_notsupp,
927 pru_rcvoob_notsupp,
928 ngd_send,
929 pru_sense_null,
930 NULL, /* shutdown */
931 ng_setsockaddr,
932 sosend,
933 soreceive,
934 sopoll
935};
936
937/*
938 * Definitions of protocols supported in the NETGRAPH domain.
939 */
940
941extern struct domain ngdomain; /* stop compiler warnings */
942
943static struct protosw ngsw[] = {
944 {
945 SOCK_DGRAM,
946 &ngdomain,
947 NG_CONTROL,
948 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */,
949 0, 0, 0, 0,
950 NULL,
951 0, 0, 0, 0,
952 &ngc_usrreqs
953 },
954 {
955 SOCK_DGRAM,
956 &ngdomain,
957 NG_DATA,
958 PR_ATOMIC | PR_ADDR,
959 0, 0, 0, 0,
960 NULL,
961 0, 0, 0, 0,
962 &ngd_usrreqs
963 }
964};
965
966struct domain ngdomain = {
967 AF_NETGRAPH,
968 "netgraph",
969 0,
970 NULL,
971 NULL,
972 ngsw,
973 &ngsw[sizeof(ngsw) / sizeof(ngsw[0])],
974 0,
975 NULL,
976 0,
977 0
978};
979
980/*
981 * Handle loading and unloading for this node type
982 * This is to handle auxiliary linkages (e.g protocol domain addition).
983 */
984static int
985ngs_mod_event(module_t mod, int event, void *data)
986{
987 int error = 0;
988
989 switch (event) {
990 case MOD_LOAD:
991 /* Register protocol domain */
992 net_add_domain(&ngdomain);
993 break;
994 case MOD_UNLOAD:
995 /* Insure there are no open netgraph sockets */
996 if (!LIST_EMPTY(&ngsocklist)) {
997 error = EBUSY;
998 break;
999 }
1000
1001#ifdef NOTYET
1002 /* Unregister protocol domain XXX can't do this yet.. */
1003 if ((error = net_rm_domain(&ngdomain)) != 0)
1004 break;
1005#else
1006 error = EBUSY;
1007#endif
1008 break;
1009 default:
1010 error = EOPNOTSUPP;
1011 break;
1012 }
1013 return (error);
1014}
1015
1016SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, "");
1017SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA");
1018SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, "");
1019SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL");
1020SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, "");
1021