1
2 /*
3 * ng_ether.c
4 *
5 * Copyright (c) 1996-2000 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 * Authors: Archie Cobbs <archie@freebsd.org>
38 * Julian Elischer <julian@freebsd.org>
39 *
40 * $FreeBSD: src/sys/netgraph/ng_ether.c,v 1.2.2.13 2002/07/02 20:10:25 archie Exp $
41 */
42
43 /*
44 * ng_ether(4) netgraph node type
45 */
46
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/kernel.h>
50 #include <sys/malloc.h>
51 #include <sys/mbuf.h>
52 #include <sys/errno.h>
53 #include <sys/syslog.h>
54 #include <sys/socket.h>
55 #include <sys/thread2.h>
56
57 #include <net/if.h>
58 #include <net/if_types.h>
59 #include <net/if_arp.h>
60 #include <net/if_var.h>
61 #include <net/ethernet.h>
62
63 #include <netgraph/ng_message.h>
64 #include <netgraph/netgraph.h>
65 #include <netgraph/ng_parse.h>
66 #include "ng_ether.h"
67
68 #define IFP2AC(IFP) ((struct arpcom *)IFP)
69 #define IFP2NG(ifp) (IFP2AC((ifp))->ac_netgraph)
70
71 /* Per-node private data */
72 struct private {
73 struct ifnet *ifp; /* associated interface */
74 hook_p upper; /* upper hook connection */
75 hook_p lower; /* lower OR orphan hook connection */
76 u_char lowerOrphan; /* whether lower is lower or orphan */
77 u_char autoSrcAddr; /* always overwrite source address */
78 u_char promisc; /* promiscuous mode enabled */
79 u_long hwassist; /* hardware checksum capabilities */
80 };
81 typedef struct private *priv_p;
82
83 /* Functional hooks called from if_ethersubr.c */
84 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
85 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
86 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
87 static void ng_ether_attach(struct ifnet *ifp);
88 static void ng_ether_detach(struct ifnet *ifp);
89
90 /* Other functions */
91 static void ng_ether_input2(node_p node, struct mbuf **mp);
92 static int ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
93 static int ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta);
94
95 /* Netgraph node methods */
96 static ng_constructor_t ng_ether_constructor;
97 static ng_rcvmsg_t ng_ether_rcvmsg;
98 static ng_shutdown_t ng_ether_rmnode;
99 static ng_newhook_t ng_ether_newhook;
100 static ng_rcvdata_t ng_ether_rcvdata;
101 static ng_disconnect_t ng_ether_disconnect;
102 static int ng_ether_mod_event(module_t mod, int event, void *data);
103
104 /* Parse type for an Ethernet address */
105 static ng_parse_t ng_enaddr_parse;
106 static ng_unparse_t ng_enaddr_unparse;
107 const struct ng_parse_type ng_ether_enaddr_type = {
108 NULL,
109 NULL,
110 NULL,
111 ng_enaddr_parse,
112 ng_enaddr_unparse,
113 NULL, /* no such thing as a "default" EN address */
114 0
115 };
116
117 /* List of commands and how to convert arguments to/from ASCII */
118 static const struct ng_cmdlist ng_ether_cmdlist[] = {
119 {
120 NGM_ETHER_COOKIE,
121 NGM_ETHER_GET_IFNAME,
122 "getifname",
123 NULL,
124 &ng_parse_string_type
125 },
126 {
127 NGM_ETHER_COOKIE,
128 NGM_ETHER_GET_IFINDEX,
129 "getifindex",
130 NULL,
131 &ng_parse_int32_type
132 },
133 {
134 NGM_ETHER_COOKIE,
135 NGM_ETHER_GET_ENADDR,
136 "getenaddr",
137 NULL,
138 &ng_ether_enaddr_type
139 },
140 {
141 NGM_ETHER_COOKIE,
142 NGM_ETHER_SET_ENADDR,
143 "setenaddr",
144 &ng_ether_enaddr_type,
145 NULL
146 },
147 {
148 NGM_ETHER_COOKIE,
149 NGM_ETHER_GET_PROMISC,
150 "getpromisc",
151 NULL,
152 &ng_parse_int32_type
153 },
154 {
155 NGM_ETHER_COOKIE,
156 NGM_ETHER_SET_PROMISC,
157 "setpromisc",
158 &ng_parse_int32_type,
159 NULL
160 },
161 {
162 NGM_ETHER_COOKIE,
163 NGM_ETHER_GET_AUTOSRC,
164 "getautosrc",
165 NULL,
166 &ng_parse_int32_type
167 },
168 {
169 NGM_ETHER_COOKIE,
170 NGM_ETHER_SET_AUTOSRC,
171 "setautosrc",
172 &ng_parse_int32_type,
173 NULL
174 },
175 { 0 }
176 };
177
178 static struct ng_type ng_ether_typestruct = {
179 NG_VERSION,
180 NG_ETHER_NODE_TYPE,
181 ng_ether_mod_event,
182 ng_ether_constructor,
183 ng_ether_rcvmsg,
184 ng_ether_rmnode,
185 ng_ether_newhook,
186 NULL,
187 NULL,
188 ng_ether_rcvdata,
189 ng_ether_rcvdata,
190 ng_ether_disconnect,
191 ng_ether_cmdlist,
192 };
193 NETGRAPH_INIT(ether, &ng_ether_typestruct);
194
195 /******************************************************************
196 ETHERNET FUNCTION HOOKS
197 ******************************************************************/
198
199 /*
200 * Handle a packet that has come in on an interface. We get to
201 * look at it here before any upper layer protocols do.
202 */
203 static void
ng_ether_input(struct ifnet * ifp,struct mbuf ** mp)204 ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
205 {
206 const node_p node = IFP2NG(ifp);
207 const priv_p priv = node->private;
208
209 /* If "lower" hook not connected, let packet continue */
210 if (priv->lower == NULL || priv->lowerOrphan)
211 return;
212 ng_ether_input2(node, mp);
213 }
214
215 /*
216 * Handle a packet that has come in on an interface, and which
217 * does not match any of our known protocols (an ``orphan'').
218 */
219 static void
ng_ether_input_orphan(struct ifnet * ifp,struct mbuf * m)220 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
221 {
222 const node_p node = IFP2NG(ifp);
223 const priv_p priv = node->private;
224
225 /* If "orphan" hook not connected, let packet continue */
226 if (priv->lower == NULL || !priv->lowerOrphan) {
227 m_freem(m);
228 return;
229 }
230 ng_ether_input2(node, &m);
231 if (m != NULL)
232 m_freem(m);
233 }
234
235 /*
236 * Handle a packet that has come in on an interface.
237 * The Ethernet header has already been detached from the mbuf,
238 * so we have to put it back.
239 *
240 * NOTE: this function will get called at splimp()
241 */
242 static void
ng_ether_input2(node_p node,struct mbuf ** mp)243 ng_ether_input2(node_p node, struct mbuf **mp)
244 {
245 const priv_p priv = node->private;
246 meta_p meta = NULL;
247
248 /* Send out lower/orphan hook */
249 ng_queue_data(priv->lower, *mp, meta);
250 *mp = NULL;
251 }
252
253 /*
254 * Handle a packet that is going out on an interface.
255 * The Ethernet header is already attached to the mbuf.
256 */
257 static int
ng_ether_output(struct ifnet * ifp,struct mbuf ** mp)258 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
259 {
260 const node_p node = IFP2NG(ifp);
261 const priv_p priv = node->private;
262 meta_p meta = NULL;
263 int error = 0;
264
265 /* If "upper" hook not connected, let packet continue */
266 if (priv->upper == NULL)
267 return (0);
268
269 /* Send it out "upper" hook */
270 NG_SEND_DATA(error, priv->upper, *mp, meta);
271 *mp = NULL;
272 return (error);
273 }
274
275 /*
276 * A new Ethernet interface has been attached.
277 * Create a new node for it, etc.
278 */
279 static void
ng_ether_attach(struct ifnet * ifp)280 ng_ether_attach(struct ifnet *ifp)
281 {
282 char name[IFNAMSIZ + 1];
283 priv_p priv;
284 node_p node;
285
286 /* Create node */
287 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
288 strlcpy(name, ifp->if_xname, sizeof(name));
289 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
290 log(LOG_ERR, "%s: can't %s for %s\n",
291 __func__, "create node", name);
292 return;
293 }
294
295 /* Allocate private data */
296 priv = kmalloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
297 if (priv == NULL) {
298 log(LOG_ERR, "%s: can't %s for %s\n",
299 __func__, "allocate memory", name);
300 ng_unref(node);
301 return;
302 }
303 node->private = priv;
304 priv->ifp = ifp;
305 IFP2NG(ifp) = node;
306 priv->autoSrcAddr = 1;
307 priv->hwassist = ifp->if_hwassist;
308
309 /* Try to give the node the same name as the interface */
310 if (ng_name_node(node, name) != 0) {
311 log(LOG_WARNING, "%s: can't name node %s\n",
312 __func__, name);
313 }
314 }
315
316 /*
317 * An Ethernet interface is being detached.
318 * Destroy its node.
319 */
320 static void
ng_ether_detach(struct ifnet * ifp)321 ng_ether_detach(struct ifnet *ifp)
322 {
323 const node_p node = IFP2NG(ifp);
324 priv_p priv;
325
326 if (node == NULL) /* no node (why not?), ignore */
327 return;
328 ng_rmnode(node); /* break all links to other nodes */
329 node->flags |= NG_INVALID;
330 ng_unname(node); /* free name (and its reference) */
331 IFP2NG(ifp) = NULL; /* detach node from interface */
332 priv = node->private; /* free node private info */
333 bzero(priv, sizeof(*priv));
334 kfree(priv, M_NETGRAPH);
335 node->private = NULL;
336 ng_unref(node); /* free node itself */
337 }
338
339 /******************************************************************
340 NETGRAPH NODE METHODS
341 ******************************************************************/
342
343 /*
344 * It is not possible or allowable to create a node of this type.
345 * Nodes get created when the interface is attached (or, when
346 * this node type's KLD is loaded).
347 */
348 static int
ng_ether_constructor(node_p * nodep)349 ng_ether_constructor(node_p *nodep)
350 {
351 return (EINVAL);
352 }
353
354 /*
355 * Check for attaching a new hook.
356 */
357 static int
ng_ether_newhook(node_p node,hook_p hook,const char * name)358 ng_ether_newhook(node_p node, hook_p hook, const char *name)
359 {
360 const priv_p priv = node->private;
361 u_char orphan = priv->lowerOrphan;
362 hook_p *hookptr;
363
364 /* Divert hook is an alias for lower */
365 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
366 name = NG_ETHER_HOOK_LOWER;
367
368 /* Which hook? */
369 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
370 hookptr = &priv->upper;
371 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
372 hookptr = &priv->lower;
373 orphan = 0;
374 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
375 hookptr = &priv->lower;
376 orphan = 1;
377 } else
378 return (EINVAL);
379
380 /* Check if already connected (shouldn't be, but doesn't hurt) */
381 if (*hookptr != NULL)
382 return (EISCONN);
383
384 /* Disable hardware checksums while 'upper' hook is connected */
385 if (hookptr == &priv->upper)
386 priv->ifp->if_hwassist = 0;
387
388 /* OK */
389 *hookptr = hook;
390 priv->lowerOrphan = orphan;
391 return (0);
392 }
393
394 /*
395 * Receive an incoming control message.
396 */
397 static int
ng_ether_rcvmsg(node_p node,struct ng_mesg * msg,const char * retaddr,struct ng_mesg ** rptr)398 ng_ether_rcvmsg(node_p node, struct ng_mesg *msg,
399 const char *retaddr, struct ng_mesg **rptr)
400 {
401 const priv_p priv = node->private;
402 struct ng_mesg *resp = NULL;
403 int error = 0;
404
405 switch (msg->header.typecookie) {
406 case NGM_ETHER_COOKIE:
407 switch (msg->header.cmd) {
408 case NGM_ETHER_GET_IFNAME:
409 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
410 if (resp == NULL) {
411 error = ENOMEM;
412 break;
413 }
414 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
415 break;
416 case NGM_ETHER_GET_IFINDEX:
417 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
418 if (resp == NULL) {
419 error = ENOMEM;
420 break;
421 }
422 *((u_int32_t *)resp->data) = priv->ifp->if_index;
423 break;
424 case NGM_ETHER_GET_ENADDR:
425 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
426 if (resp == NULL) {
427 error = ENOMEM;
428 break;
429 }
430 bcopy((IFP2AC(priv->ifp))->ac_enaddr,
431 resp->data, ETHER_ADDR_LEN);
432 break;
433 case NGM_ETHER_SET_ENADDR:
434 {
435 if (msg->header.arglen != ETHER_ADDR_LEN) {
436 error = EINVAL;
437 break;
438 }
439 error = if_setlladdr(priv->ifp,
440 (u_char *)msg->data, ETHER_ADDR_LEN);
441 break;
442 }
443 case NGM_ETHER_GET_PROMISC:
444 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
445 if (resp == NULL) {
446 error = ENOMEM;
447 break;
448 }
449 *((u_int32_t *)resp->data) = priv->promisc;
450 break;
451 case NGM_ETHER_SET_PROMISC:
452 {
453 u_char want;
454
455 if (msg->header.arglen != sizeof(u_int32_t)) {
456 error = EINVAL;
457 break;
458 }
459 want = !!*((u_int32_t *)msg->data);
460 if (want ^ priv->promisc) {
461 if ((error = ifpromisc(priv->ifp, want)) != 0)
462 break;
463 priv->promisc = want;
464 }
465 break;
466 }
467 case NGM_ETHER_GET_AUTOSRC:
468 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
469 if (resp == NULL) {
470 error = ENOMEM;
471 break;
472 }
473 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
474 break;
475 case NGM_ETHER_SET_AUTOSRC:
476 if (msg->header.arglen != sizeof(u_int32_t)) {
477 error = EINVAL;
478 break;
479 }
480 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
481 break;
482 default:
483 error = EINVAL;
484 break;
485 }
486 break;
487 default:
488 error = EINVAL;
489 break;
490 }
491 if (rptr)
492 *rptr = resp;
493 else if (resp != NULL)
494 kfree(resp, M_NETGRAPH);
495 kfree(msg, M_NETGRAPH);
496 return (error);
497 }
498
499 /*
500 * Receive data on a hook.
501 */
502 static int
ng_ether_rcvdata(hook_p hook,struct mbuf * m,meta_p meta)503 ng_ether_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
504 {
505 const node_p node = hook->node;
506 const priv_p priv = node->private;
507
508 if (hook == priv->lower)
509 return ng_ether_rcv_lower(node, m, meta);
510 if (hook == priv->upper)
511 return ng_ether_rcv_upper(node, m, meta);
512 panic("%s: weird hook", __func__);
513 }
514
515 /*
516 * Handle an mbuf received on the "lower" hook.
517 */
518 static int
ng_ether_rcv_lower(node_p node,struct mbuf * m,meta_p meta)519 ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
520 {
521 const priv_p priv = node->private;
522 struct ifnet *const ifp = priv->ifp;
523 int error;
524
525 /* Discard meta info */
526 NG_FREE_META(meta);
527
528 /* Check whether interface is ready for packets */
529 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
530 m_freem(m);
531 return (ENETDOWN);
532 }
533
534 /* Make sure header is fully pulled up */
535 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
536 m_freem(m);
537 return (EINVAL);
538 }
539 if (m->m_len < sizeof(struct ether_header)
540 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
541 return (ENOBUFS);
542
543 /* Drop in the MAC address if desired */
544 if (priv->autoSrcAddr) {
545
546 /* Make the mbuf writable if it's not already */
547 if (!M_WRITABLE(m)
548 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
549 return (ENOBUFS);
550
551 /* Overwrite source MAC address */
552 bcopy((IFP2AC(ifp))->ac_enaddr,
553 mtod(m, struct ether_header *)->ether_shost,
554 ETHER_ADDR_LEN);
555 }
556
557 /* Send it on its way */
558 error = ether_output_frame(ifp, m);
559 return (error);
560 }
561
562 /*
563 * Handle an mbuf received on the "upper" hook.
564 */
565 static int
ng_ether_rcv_upper(node_p node,struct mbuf * m,meta_p meta)566 ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta)
567 {
568 const priv_p priv = node->private;
569
570 /* Discard meta info */
571 NG_FREE_META(meta);
572
573 /* Check length and pull off header */
574 if (m->m_pkthdr.len < ETHER_HDR_LEN) {
575 m_freem(m);
576 return (EINVAL);
577 }
578 if (m->m_len < ETHER_HDR_LEN &&
579 (m = m_pullup(m, ETHER_HDR_LEN)) == NULL)
580 return (ENOBUFS);
581
582 m->m_pkthdr.rcvif = priv->ifp;
583
584 /* Route packet back in */
585 ether_demux(m);
586 return (0);
587 }
588
589 /*
590 * Shutdown node. This resets the node but does not remove it.
591 */
592 static int
ng_ether_rmnode(node_p node)593 ng_ether_rmnode(node_p node)
594 {
595 const priv_p priv = node->private;
596
597 ng_cutlinks(node);
598 node->flags &= ~NG_INVALID; /* bounce back to life */
599 if (priv->promisc) { /* disable promiscuous mode */
600 ifpromisc(priv->ifp, 0);
601 priv->promisc = 0;
602 }
603 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
604 return (0);
605 }
606
607 /*
608 * Hook disconnection.
609 */
610 static int
ng_ether_disconnect(hook_p hook)611 ng_ether_disconnect(hook_p hook)
612 {
613 const priv_p priv = hook->node->private;
614
615 if (hook == priv->upper) {
616 priv->upper = NULL;
617 priv->ifp->if_hwassist = priv->hwassist; /* restore h/w csum */
618 } else if (hook == priv->lower) {
619 priv->lower = NULL;
620 priv->lowerOrphan = 0;
621 } else
622 panic("%s: weird hook", __func__);
623 if (hook->node->numhooks == 0)
624 ng_rmnode(hook->node); /* reset node */
625 return (0);
626 }
627
628 static int
ng_enaddr_parse(const struct ng_parse_type * type,const char * s,int * const off,const u_char * const start,u_char * const buf,int * const buflen)629 ng_enaddr_parse(const struct ng_parse_type *type,
630 const char *s, int *const off, const u_char *const start,
631 u_char *const buf, int *const buflen)
632 {
633 char *eptr;
634 u_long val;
635 int i;
636
637 if (*buflen < ETHER_ADDR_LEN)
638 return (ERANGE);
639 for (i = 0; i < ETHER_ADDR_LEN; i++) {
640 val = strtoul(s + *off, &eptr, 16);
641 if (val > 0xff || eptr == s + *off)
642 return (EINVAL);
643 buf[i] = (u_char)val;
644 *off = (eptr - s);
645 if (i < ETHER_ADDR_LEN - 1) {
646 if (*eptr != ':')
647 return (EINVAL);
648 (*off)++;
649 }
650 }
651 *buflen = ETHER_ADDR_LEN;
652 return (0);
653 }
654
655 static int
ng_enaddr_unparse(const struct ng_parse_type * type,const u_char * data,int * off,char * cbuf,int cbuflen)656 ng_enaddr_unparse(const struct ng_parse_type *type,
657 const u_char *data, int *off, char *cbuf, int cbuflen)
658 {
659 int len;
660
661 len = ksnprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x",
662 data[*off], data[*off + 1], data[*off + 2],
663 data[*off + 3], data[*off + 4], data[*off + 5]);
664 if (len >= cbuflen)
665 return (ERANGE);
666 *off += ETHER_ADDR_LEN;
667 return (0);
668 }
669
670 /******************************************************************
671 INITIALIZATION
672 ******************************************************************/
673
674 /*
675 * Handle loading and unloading for this node type.
676 */
677 static int
ng_ether_mod_event(module_t mod,int event,void * data)678 ng_ether_mod_event(module_t mod, int event, void *data)
679 {
680 struct ifnet *ifp;
681 int error = 0;
682
683 crit_enter();
684 switch (event) {
685 case MOD_LOAD:
686
687 /* Register function hooks */
688 if (ng_ether_attach_p != NULL) {
689 error = EEXIST;
690 break;
691 }
692 ng_ether_attach_p = ng_ether_attach;
693 ng_ether_detach_p = ng_ether_detach;
694 ng_ether_output_p = ng_ether_output;
695 ng_ether_input_p = ng_ether_input;
696 ng_ether_input_orphan_p = ng_ether_input_orphan;
697
698 /* Create nodes for any already-existing Ethernet interfaces */
699 ifnet_lock();
700 TAILQ_FOREACH(ifp, &ifnetlist, if_link) {
701 if (ifp->if_type == IFT_ETHER ||
702 ifp->if_type == IFT_L2VLAN)
703 ng_ether_attach(ifp);
704 }
705 ifnet_unlock();
706 break;
707
708 case MOD_UNLOAD:
709
710 /*
711 * Note that the base code won't try to unload us until
712 * all nodes have been removed, and that can't happen
713 * until all Ethernet interfaces are removed. In any
714 * case, we know there are no nodes left if the action
715 * is MOD_UNLOAD, so there's no need to detach any nodes.
716 */
717
718 /* Unregister function hooks */
719 ng_ether_attach_p = NULL;
720 ng_ether_detach_p = NULL;
721 ng_ether_output_p = NULL;
722 ng_ether_input_p = NULL;
723 ng_ether_input_orphan_p = NULL;
724 break;
725
726 default:
727 error = EOPNOTSUPP;
728 break;
729 }
730 crit_exit();
731 return (error);
732 }
733
734