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: head/sys/netgraph/ng_ether.c 128376 2004-04-18 01:15:32Z luigi $
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
56#include <net/if.h>
57#include <net/if_types.h>
58#include <net/if_arp.h>
59#include <net/if_var.h>
60#include <net/ethernet.h>
61
62#include <netgraph/ng_message.h>
63#include <netgraph/netgraph.h>
64#include <netgraph/ng_parse.h>
65#include <netgraph/ng_ether.h>
66
67#define IFP2NG(ifp) ((struct ng_node *)((struct arpcom *)(ifp))->ac_netgraph)
68
69/* Per-node private data */
70struct private {
71 struct ifnet *ifp; /* associated interface */
72 hook_p upper; /* upper hook connection */
73 hook_p lower; /* lower OR orphan hook connection */
74 u_char lowerOrphan; /* whether lower is lower or orphan */
75 u_char autoSrcAddr; /* always overwrite source address */
76 u_char promisc; /* promiscuous mode enabled */
77 u_long hwassist; /* hardware checksum capabilities */
78 u_int flags; /* flags e.g. really die */
79};
80typedef struct private *priv_p;
81
82/* Hook pointers used by if_ethersubr.c to callback to netgraph */
83extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
84extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
85extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
86extern void (*ng_ether_attach_p)(struct ifnet *ifp);
87extern void (*ng_ether_detach_p)(struct ifnet *ifp);
88
89/* Functional hooks called from if_ethersubr.c */
90static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
91static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
92static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
93static void ng_ether_attach(struct ifnet *ifp);
94static void ng_ether_detach(struct ifnet *ifp);
95
96/* Other functions */
97static void ng_ether_input2(node_p node, struct mbuf **mp);
98static int ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
99static int ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta);
100
101/* Netgraph node methods */
102static ng_constructor_t ng_ether_constructor;
103static ng_rcvmsg_t ng_ether_rcvmsg;
104static ng_shutdown_t ng_ether_shutdown;
105static ng_newhook_t ng_ether_newhook;
106static ng_connect_t ng_ether_connect;
107static ng_rcvdata_t ng_ether_rcvdata;
108static ng_disconnect_t ng_ether_disconnect;
109static int ng_ether_mod_event(module_t mod, int event, void *data);
110
111/* List of commands and how to convert arguments to/from ASCII */
112static const struct ng_cmdlist ng_ether_cmdlist[] = {
113 {
114 NGM_ETHER_COOKIE,
115 NGM_ETHER_GET_IFNAME,
116 "getifname",
117 NULL,
118 &ng_parse_string_type
119 },
120 {
121 NGM_ETHER_COOKIE,
122 NGM_ETHER_GET_IFINDEX,
123 "getifindex",
124 NULL,
125 &ng_parse_int32_type
126 },
127 {
128 NGM_ETHER_COOKIE,
129 NGM_ETHER_GET_ENADDR,
130 "getenaddr",
131 NULL,
132 &ng_parse_enaddr_type
133 },
134 {
135 NGM_ETHER_COOKIE,
136 NGM_ETHER_SET_ENADDR,
137 "setenaddr",
138 &ng_parse_enaddr_type,
139 NULL
140 },
141 {
142 NGM_ETHER_COOKIE,
143 NGM_ETHER_GET_PROMISC,
144 "getpromisc",
145 NULL,
146 &ng_parse_int32_type
147 },
148 {
149 NGM_ETHER_COOKIE,
150 NGM_ETHER_SET_PROMISC,
151 "setpromisc",
152 &ng_parse_int32_type,
153 NULL
154 },
155 {
156 NGM_ETHER_COOKIE,
157 NGM_ETHER_GET_AUTOSRC,
158 "getautosrc",
159 NULL,
160 &ng_parse_int32_type
161 },
162 {
163 NGM_ETHER_COOKIE,
164 NGM_ETHER_SET_AUTOSRC,
165 "setautosrc",
166 &ng_parse_int32_type,
167 NULL
168 },
169 { 0 }
170};
171
172static struct ng_type ng_ether_typestruct = {
173 NG_ABI_VERSION,
174 NG_ETHER_NODE_TYPE,
175 ng_ether_mod_event,
176 ng_ether_constructor,
177 ng_ether_rcvmsg,
178 ng_ether_shutdown,
179 ng_ether_newhook,
180 NULL,
181 ng_ether_connect,
182 ng_ether_rcvdata,
183 ng_ether_disconnect,
184 ng_ether_cmdlist,
185};
186MODULE_VERSION(ng_ether, 1);
187NETGRAPH_INIT(ether, &ng_ether_typestruct);
188
189/******************************************************************
190 ETHERNET FUNCTION HOOKS
191******************************************************************/
192
193/*
194 * Handle a packet that has come in on an interface. We get to
195 * look at it here before any upper layer protocols do.
196 *
197 * NOTE: this function will get called at splimp()
198 */
199static void
200ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
201{
202 const node_p node = IFP2NG(ifp);
203 const priv_p priv = NG_NODE_PRIVATE(node);
204
205 /* If "lower" hook not connected, let packet continue */
206 if (priv->lower == NULL || priv->lowerOrphan)
207 return;
208 ng_ether_input2(node, mp);
209}
210
211/*
212 * Handle a packet that has come in on an interface, and which
213 * does not match any of our known protocols (an ``orphan'').
214 *
215 * NOTE: this function will get called at splimp()
216 */
217static void
218ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
219{
220 const node_p node = IFP2NG(ifp);
221 const priv_p priv = NG_NODE_PRIVATE(node);
222
223 /* If "orphan" hook not connected, let packet continue */
224 if (priv->lower == NULL || !priv->lowerOrphan) {
225 m_freem(m);
226 return;
227 }
228 ng_ether_input2(node, &m);
229 if (m != NULL)
230 m_freem(m);
231}
232
233/*
234 * Handle a packet that has come in on an ethernet interface.
235 * The Ethernet header has already been detached from the mbuf,
236 * so we have to put it back.
237 *
238 * NOTE: this function will get called at splimp()
239 */
240static void
241ng_ether_input2(node_p node, struct mbuf **mp)
242{
243 const priv_p priv = NG_NODE_PRIVATE(node);
244 int error;
245
246 /* Send out lower/orphan hook */
247 NG_SEND_DATA_ONLY(error, priv->lower, *mp);
248 *mp = NULL;
249}
250
251/*
252 * Handle a packet that is going out on an interface.
253 * The Ethernet header is already attached to the mbuf.
254 */
255static int
256ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
257{
258 const node_p node = IFP2NG(ifp);
259 const priv_p priv = NG_NODE_PRIVATE(node);
260 int error = 0;
261
262 /* If "upper" hook not connected, let packet continue */
263 if (priv->upper == NULL)
264 return (0);
265
266 /* Send it out "upper" hook */
267 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
268 return (error);
269}
270
271/*
272 * A new Ethernet interface has been attached.
273 * Create a new node for it, etc.
274 */
275static void
276ng_ether_attach(struct ifnet *ifp)
277{
278 priv_p priv;
279 node_p node;
280
281 /* Create node */
282 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
283 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
284 log(LOG_ERR, "%s: can't %s for %s\n",
285 __func__, "create node", ifp->if_xname);
286 return;
287 }
288
289 /* Allocate private data */
290 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
291 if (priv == NULL) {
292 log(LOG_ERR, "%s: can't %s for %s\n",
293 __func__, "allocate memory", ifp->if_xname);
294 NG_NODE_UNREF(node);
295 return;
296 }
297 NG_NODE_SET_PRIVATE(node, priv);
298 priv->ifp = ifp;
299 IFP2NG(ifp) = node;
300 priv->autoSrcAddr = 1;
301 priv->hwassist = ifp->if_hwassist;
302
303 /* Try to give the node the same name as the interface */
304 if (ng_name_node(node, ifp->if_xname) != 0) {
305 log(LOG_WARNING, "%s: can't name node %s\n",
306 __func__, ifp->if_xname);
307 }
308}
309
310/*
311 * An Ethernet interface is being detached.
312 * REALLY Destroy its node.
313 */
314static void
315ng_ether_detach(struct ifnet *ifp)
316{
317 const node_p node = IFP2NG(ifp);
318 const priv_p priv = NG_NODE_PRIVATE(node);
319
320 if (node == NULL) /* no node (why not?), ignore */
321 return;
322 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
323 /*
324 * We can't assume the ifnet is still around when we run shutdown
325 * So zap it now. XXX We HOPE that anything running at this time
326 * handles it (as it should in the non netgraph case).
327 */
328 IFP2NG(ifp) = NULL;
329 priv->ifp = NULL; /* XXX race if interrupted an output packet */
330 ng_rmnode_self(node); /* remove all netgraph parts */
331}
332
333/******************************************************************
334 NETGRAPH NODE METHODS
335******************************************************************/
336
337/*
338 * It is not possible or allowable to create a node of this type.
339 * Nodes get created when the interface is attached (or, when
340 * this node type's KLD is loaded).
341 */
342static int
343ng_ether_constructor(node_p node)
344{
345 return (EINVAL);
346}
347
348/*
349 * Check for attaching a new hook.
350 */
351static int
352ng_ether_newhook(node_p node, hook_p hook, const char *name)
353{
354 const priv_p priv = NG_NODE_PRIVATE(node);
355 u_char orphan = priv->lowerOrphan;
356 hook_p *hookptr;
357
358 /* Divert hook is an alias for lower */
359 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
360 name = NG_ETHER_HOOK_LOWER;
361
362 /* Which hook? */
363 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
364 hookptr = &priv->upper;
365 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
366 hookptr = &priv->lower;
367 orphan = 0;
368 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
369 hookptr = &priv->lower;
370 orphan = 1;
371 } else
372 return (EINVAL);
373
374 /* Check if already connected (shouldn't be, but doesn't hurt) */
375 if (*hookptr != NULL)
376 return (EISCONN);
377
378 /* Disable hardware checksums while 'upper' hook is connected */
379 if (hookptr == &priv->upper)
380 priv->ifp->if_hwassist = 0;
381
382 /* OK */
383 *hookptr = hook;
384 priv->lowerOrphan = orphan;
385 return (0);
386}
387
388/*
389 * Hooks are attached, adjust to force queueing.
390 * We don't really care which hook it is.
391 * they should all be queuing for outgoing data.
392 */
393static int
394ng_ether_connect(hook_p hook)
395{
396 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
397 return (0);
398}
399
400/*
401 * Receive an incoming control message.
402 */
403static int
404ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
405{
406 const priv_p priv = NG_NODE_PRIVATE(node);
407 struct ng_mesg *resp = NULL;
408 int error = 0;
409 struct ng_mesg *msg;
410
411 NGI_GET_MSG(item, msg);
412 switch (msg->header.typecookie) {
413 case NGM_ETHER_COOKIE:
414 switch (msg->header.cmd) {
415 case NGM_ETHER_GET_IFNAME:
416 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
417 if (resp == NULL) {
418 error = ENOMEM;
419 break;
420 }
421 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ + 1);
422 break;
423 case NGM_ETHER_GET_IFINDEX:
424 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
425 if (resp == NULL) {
426 error = ENOMEM;
427 break;
428 }
429 *((u_int32_t *)resp->data) = priv->ifp->if_index;
430 break;
431 case NGM_ETHER_GET_ENADDR:
432 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
433 if (resp == NULL) {
434 error = ENOMEM;
435 break;
436 }
437 bcopy((IFP2AC(priv->ifp))->ac_enaddr,
438 resp->data, ETHER_ADDR_LEN);
439 break;
440 case NGM_ETHER_SET_ENADDR:
441 {
442 if (msg->header.arglen != ETHER_ADDR_LEN) {
443 error = EINVAL;
444 break;
445 }
446 error = if_setlladdr(priv->ifp,
447 (u_char *)msg->data, ETHER_ADDR_LEN);
448 break;
449 }
450 case NGM_ETHER_GET_PROMISC:
451 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
452 if (resp == NULL) {
453 error = ENOMEM;
454 break;
455 }
456 *((u_int32_t *)resp->data) = priv->promisc;
457 break;
458 case NGM_ETHER_SET_PROMISC:
459 {
460 u_char want;
461
462 if (msg->header.arglen != sizeof(u_int32_t)) {
463 error = EINVAL;
464 break;
465 }
466 want = !!*((u_int32_t *)msg->data);
467 if (want ^ priv->promisc) {
468 if ((error = ifpromisc(priv->ifp, want)) != 0)
469 break;
470 priv->promisc = want;
471 }
472 break;
473 }
474 case NGM_ETHER_GET_AUTOSRC:
475 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
476 if (resp == NULL) {
477 error = ENOMEM;
478 break;
479 }
480 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
481 break;
482 case NGM_ETHER_SET_AUTOSRC:
483 if (msg->header.arglen != sizeof(u_int32_t)) {
484 error = EINVAL;
485 break;
486 }
487 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
488 break;
489 default:
490 error = EINVAL;
491 break;
492 }
493 break;
494 default:
495 error = EINVAL;
496 break;
497 }
498 NG_RESPOND_MSG(error, node, item, resp);
499 NG_FREE_MSG(msg);
500 return (error);
501}
502
503/*
504 * Receive data on a hook.
505 */
506static int
507ng_ether_rcvdata(hook_p hook, item_p item)
508{
509 const node_p node = NG_HOOK_NODE(hook);
510 const priv_p priv = NG_NODE_PRIVATE(node);
511 struct mbuf *m;
512 meta_p meta;
513
514 NGI_GET_M(item, m);
515 NGI_GET_META(item, meta);
516 NG_FREE_ITEM(item);
517 if (hook == priv->lower)
518 return ng_ether_rcv_lower(node, m, meta);
519 if (hook == priv->upper)
520 return ng_ether_rcv_upper(node, m, meta);
521 panic("%s: weird hook", __func__);
522#ifdef RESTARTABLE_PANICS /* so we don;t get an error msg in LINT */
523 return NULL;
524#endif
525}
526
527/*
528 * Handle an mbuf received on the "lower" hook.
529 */
530static int
531ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
532{
533 const priv_p priv = NG_NODE_PRIVATE(node);
534 struct ifnet *const ifp = priv->ifp;
535
536 /* Discard meta info */
537 NG_FREE_META(meta);
538
539 /* Check whether interface is ready for packets */
540 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
541 NG_FREE_M(m);
542 return (ENETDOWN);
543 }
544
545 /* Make sure header is fully pulled up */
546 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
547 NG_FREE_M(m);
548 return (EINVAL);
549 }
550 if (m->m_len < sizeof(struct ether_header)
551 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
552 return (ENOBUFS);
553
554 /* Drop in the MAC address if desired */
555 if (priv->autoSrcAddr) {
556
557 /* Make the mbuf writable if it's not already */
558 if (!M_WRITABLE(m)
559 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
560 return (ENOBUFS);
561
562 /* Overwrite source MAC address */
563 bcopy((IFP2AC(ifp))->ac_enaddr,
564 mtod(m, struct ether_header *)->ether_shost,
565 ETHER_ADDR_LEN);
566 }
567
568 /* Send it on its way */
569 return ether_output_frame(ifp, m);
570}
571
572/*
573 * Handle an mbuf received on the "upper" hook.
574 */
575static int
576ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta)
577{
578 const priv_p priv = NG_NODE_PRIVATE(node);
579
580 /* Discard meta info */
581 NG_FREE_META(meta);
582
583 m->m_pkthdr.rcvif = priv->ifp;
584
585 /* Route packet back in */
586 ether_demux(priv->ifp, m);
587 return (0);
588}
589
590/*
591 * Shutdown node. This resets the node but does not remove it
592 * unless the REALLY_DIE flag is set.
593 */
594static int
595ng_ether_shutdown(node_p node)
596{
597 const priv_p priv = NG_NODE_PRIVATE(node);
598
599 if (node->nd_flags & NG_REALLY_DIE) {
600 /*
601 * WE came here because the ethernet card is being unloaded,
602 * so stop being persistant.
603 * Actually undo all the things we did on creation.
604 * Assume the ifp has already been freed.
605 */
606 NG_NODE_SET_PRIVATE(node, NULL);
607 FREE(priv, M_NETGRAPH);
608 NG_NODE_UNREF(node); /* free node itself */
609 return (0);
610 }
611 if (priv->promisc) { /* disable promiscuous mode */
612 (void)ifpromisc(priv->ifp, 0);
613 priv->promisc = 0;
614 }
615 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
616 node->nd_flags &= ~NG_INVALID; /* Signal ng_rmnode we are persisant */
617 return (0);
618}
619
620/*
621 * Hook disconnection.
622 */
623static int
624ng_ether_disconnect(hook_p hook)
625{
626 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
627
628 if (hook == priv->upper) {
629 priv->upper = NULL;
630 if (priv->ifp != NULL) /* restore h/w csum */
631 priv->ifp->if_hwassist = priv->hwassist;
632 } else if (hook == priv->lower) {
633 priv->lower = NULL;
634 priv->lowerOrphan = 0;
635 } else
636 panic("%s: weird hook", __func__);
637 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
638 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
639 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
640 return (0);
641}
642
643/******************************************************************
644 INITIALIZATION
645******************************************************************/
646
647/*
648 * Handle loading and unloading for this node type.
649 */
650static int
651ng_ether_mod_event(module_t mod, int event, void *data)
652{
653 struct ifnet *ifp;
654 int error = 0;
655 int s;
656
657 s = splnet();
658 switch (event) {
659 case MOD_LOAD:
660
661 /* Register function hooks */
662 if (ng_ether_attach_p != NULL) {
663 error = EEXIST;
664 break;
665 }
666 ng_ether_attach_p = ng_ether_attach;
667 ng_ether_detach_p = ng_ether_detach;
668 ng_ether_output_p = ng_ether_output;
669 ng_ether_input_p = ng_ether_input;
670 ng_ether_input_orphan_p = ng_ether_input_orphan;
671
672 /* Create nodes for any already-existing Ethernet interfaces */
673 IFNET_RLOCK();
674 TAILQ_FOREACH(ifp, &ifnet, if_link) {
675 if (ifp->if_type == IFT_ETHER
676 || ifp->if_type == IFT_L2VLAN)
677 ng_ether_attach(ifp);
678 }
679 IFNET_RUNLOCK();
680 break;
681
682 case MOD_UNLOAD:
683
684 /*
685 * Note that the base code won't try to unload us until
686 * all nodes have been removed, and that can't happen
687 * until all Ethernet interfaces are removed. In any
688 * case, we know there are no nodes left if the action
689 * is MOD_UNLOAD, so there's no need to detach any nodes.
690 */
691
692 /* Unregister function hooks */
693 ng_ether_attach_p = NULL;
694 ng_ether_detach_p = NULL;
695 ng_ether_output_p = NULL;
696 ng_ether_input_p = NULL;
697 ng_ether_input_orphan_p = NULL;
698 break;
699
700 default:
701 error = EOPNOTSUPP;
702 break;
703 }
704 splx(s);
705 return (error);
706}
707
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: head/sys/netgraph/ng_ether.c 128376 2004-04-18 01:15:32Z luigi $
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
56#include <net/if.h>
57#include <net/if_types.h>
58#include <net/if_arp.h>
59#include <net/if_var.h>
60#include <net/ethernet.h>
61
62#include <netgraph/ng_message.h>
63#include <netgraph/netgraph.h>
64#include <netgraph/ng_parse.h>
65#include <netgraph/ng_ether.h>
66
67#define IFP2NG(ifp) ((struct ng_node *)((struct arpcom *)(ifp))->ac_netgraph)
68
69/* Per-node private data */
70struct private {
71 struct ifnet *ifp; /* associated interface */
72 hook_p upper; /* upper hook connection */
73 hook_p lower; /* lower OR orphan hook connection */
74 u_char lowerOrphan; /* whether lower is lower or orphan */
75 u_char autoSrcAddr; /* always overwrite source address */
76 u_char promisc; /* promiscuous mode enabled */
77 u_long hwassist; /* hardware checksum capabilities */
78 u_int flags; /* flags e.g. really die */
79};
80typedef struct private *priv_p;
81
82/* Hook pointers used by if_ethersubr.c to callback to netgraph */
83extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
84extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
85extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
86extern void (*ng_ether_attach_p)(struct ifnet *ifp);
87extern void (*ng_ether_detach_p)(struct ifnet *ifp);
88
89/* Functional hooks called from if_ethersubr.c */
90static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
91static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
92static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
93static void ng_ether_attach(struct ifnet *ifp);
94static void ng_ether_detach(struct ifnet *ifp);
95
96/* Other functions */
97static void ng_ether_input2(node_p node, struct mbuf **mp);
98static int ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
99static int ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta);
100
101/* Netgraph node methods */
102static ng_constructor_t ng_ether_constructor;
103static ng_rcvmsg_t ng_ether_rcvmsg;
104static ng_shutdown_t ng_ether_shutdown;
105static ng_newhook_t ng_ether_newhook;
106static ng_connect_t ng_ether_connect;
107static ng_rcvdata_t ng_ether_rcvdata;
108static ng_disconnect_t ng_ether_disconnect;
109static int ng_ether_mod_event(module_t mod, int event, void *data);
110
111/* List of commands and how to convert arguments to/from ASCII */
112static const struct ng_cmdlist ng_ether_cmdlist[] = {
113 {
114 NGM_ETHER_COOKIE,
115 NGM_ETHER_GET_IFNAME,
116 "getifname",
117 NULL,
118 &ng_parse_string_type
119 },
120 {
121 NGM_ETHER_COOKIE,
122 NGM_ETHER_GET_IFINDEX,
123 "getifindex",
124 NULL,
125 &ng_parse_int32_type
126 },
127 {
128 NGM_ETHER_COOKIE,
129 NGM_ETHER_GET_ENADDR,
130 "getenaddr",
131 NULL,
132 &ng_parse_enaddr_type
133 },
134 {
135 NGM_ETHER_COOKIE,
136 NGM_ETHER_SET_ENADDR,
137 "setenaddr",
138 &ng_parse_enaddr_type,
139 NULL
140 },
141 {
142 NGM_ETHER_COOKIE,
143 NGM_ETHER_GET_PROMISC,
144 "getpromisc",
145 NULL,
146 &ng_parse_int32_type
147 },
148 {
149 NGM_ETHER_COOKIE,
150 NGM_ETHER_SET_PROMISC,
151 "setpromisc",
152 &ng_parse_int32_type,
153 NULL
154 },
155 {
156 NGM_ETHER_COOKIE,
157 NGM_ETHER_GET_AUTOSRC,
158 "getautosrc",
159 NULL,
160 &ng_parse_int32_type
161 },
162 {
163 NGM_ETHER_COOKIE,
164 NGM_ETHER_SET_AUTOSRC,
165 "setautosrc",
166 &ng_parse_int32_type,
167 NULL
168 },
169 { 0 }
170};
171
172static struct ng_type ng_ether_typestruct = {
173 NG_ABI_VERSION,
174 NG_ETHER_NODE_TYPE,
175 ng_ether_mod_event,
176 ng_ether_constructor,
177 ng_ether_rcvmsg,
178 ng_ether_shutdown,
179 ng_ether_newhook,
180 NULL,
181 ng_ether_connect,
182 ng_ether_rcvdata,
183 ng_ether_disconnect,
184 ng_ether_cmdlist,
185};
186MODULE_VERSION(ng_ether, 1);
187NETGRAPH_INIT(ether, &ng_ether_typestruct);
188
189/******************************************************************
190 ETHERNET FUNCTION HOOKS
191******************************************************************/
192
193/*
194 * Handle a packet that has come in on an interface. We get to
195 * look at it here before any upper layer protocols do.
196 *
197 * NOTE: this function will get called at splimp()
198 */
199static void
200ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
201{
202 const node_p node = IFP2NG(ifp);
203 const priv_p priv = NG_NODE_PRIVATE(node);
204
205 /* If "lower" hook not connected, let packet continue */
206 if (priv->lower == NULL || priv->lowerOrphan)
207 return;
208 ng_ether_input2(node, mp);
209}
210
211/*
212 * Handle a packet that has come in on an interface, and which
213 * does not match any of our known protocols (an ``orphan'').
214 *
215 * NOTE: this function will get called at splimp()
216 */
217static void
218ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
219{
220 const node_p node = IFP2NG(ifp);
221 const priv_p priv = NG_NODE_PRIVATE(node);
222
223 /* If "orphan" hook not connected, let packet continue */
224 if (priv->lower == NULL || !priv->lowerOrphan) {
225 m_freem(m);
226 return;
227 }
228 ng_ether_input2(node, &m);
229 if (m != NULL)
230 m_freem(m);
231}
232
233/*
234 * Handle a packet that has come in on an ethernet interface.
235 * The Ethernet header has already been detached from the mbuf,
236 * so we have to put it back.
237 *
238 * NOTE: this function will get called at splimp()
239 */
240static void
241ng_ether_input2(node_p node, struct mbuf **mp)
242{
243 const priv_p priv = NG_NODE_PRIVATE(node);
244 int error;
245
246 /* Send out lower/orphan hook */
247 NG_SEND_DATA_ONLY(error, priv->lower, *mp);
248 *mp = NULL;
249}
250
251/*
252 * Handle a packet that is going out on an interface.
253 * The Ethernet header is already attached to the mbuf.
254 */
255static int
256ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
257{
258 const node_p node = IFP2NG(ifp);
259 const priv_p priv = NG_NODE_PRIVATE(node);
260 int error = 0;
261
262 /* If "upper" hook not connected, let packet continue */
263 if (priv->upper == NULL)
264 return (0);
265
266 /* Send it out "upper" hook */
267 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
268 return (error);
269}
270
271/*
272 * A new Ethernet interface has been attached.
273 * Create a new node for it, etc.
274 */
275static void
276ng_ether_attach(struct ifnet *ifp)
277{
278 priv_p priv;
279 node_p node;
280
281 /* Create node */
282 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
283 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
284 log(LOG_ERR, "%s: can't %s for %s\n",
285 __func__, "create node", ifp->if_xname);
286 return;
287 }
288
289 /* Allocate private data */
290 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
291 if (priv == NULL) {
292 log(LOG_ERR, "%s: can't %s for %s\n",
293 __func__, "allocate memory", ifp->if_xname);
294 NG_NODE_UNREF(node);
295 return;
296 }
297 NG_NODE_SET_PRIVATE(node, priv);
298 priv->ifp = ifp;
299 IFP2NG(ifp) = node;
300 priv->autoSrcAddr = 1;
301 priv->hwassist = ifp->if_hwassist;
302
303 /* Try to give the node the same name as the interface */
304 if (ng_name_node(node, ifp->if_xname) != 0) {
305 log(LOG_WARNING, "%s: can't name node %s\n",
306 __func__, ifp->if_xname);
307 }
308}
309
310/*
311 * An Ethernet interface is being detached.
312 * REALLY Destroy its node.
313 */
314static void
315ng_ether_detach(struct ifnet *ifp)
316{
317 const node_p node = IFP2NG(ifp);
318 const priv_p priv = NG_NODE_PRIVATE(node);
319
320 if (node == NULL) /* no node (why not?), ignore */
321 return;
322 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
323 /*
324 * We can't assume the ifnet is still around when we run shutdown
325 * So zap it now. XXX We HOPE that anything running at this time
326 * handles it (as it should in the non netgraph case).
327 */
328 IFP2NG(ifp) = NULL;
329 priv->ifp = NULL; /* XXX race if interrupted an output packet */
330 ng_rmnode_self(node); /* remove all netgraph parts */
331}
332
333/******************************************************************
334 NETGRAPH NODE METHODS
335******************************************************************/
336
337/*
338 * It is not possible or allowable to create a node of this type.
339 * Nodes get created when the interface is attached (or, when
340 * this node type's KLD is loaded).
341 */
342static int
343ng_ether_constructor(node_p node)
344{
345 return (EINVAL);
346}
347
348/*
349 * Check for attaching a new hook.
350 */
351static int
352ng_ether_newhook(node_p node, hook_p hook, const char *name)
353{
354 const priv_p priv = NG_NODE_PRIVATE(node);
355 u_char orphan = priv->lowerOrphan;
356 hook_p *hookptr;
357
358 /* Divert hook is an alias for lower */
359 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
360 name = NG_ETHER_HOOK_LOWER;
361
362 /* Which hook? */
363 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
364 hookptr = &priv->upper;
365 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
366 hookptr = &priv->lower;
367 orphan = 0;
368 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
369 hookptr = &priv->lower;
370 orphan = 1;
371 } else
372 return (EINVAL);
373
374 /* Check if already connected (shouldn't be, but doesn't hurt) */
375 if (*hookptr != NULL)
376 return (EISCONN);
377
378 /* Disable hardware checksums while 'upper' hook is connected */
379 if (hookptr == &priv->upper)
380 priv->ifp->if_hwassist = 0;
381
382 /* OK */
383 *hookptr = hook;
384 priv->lowerOrphan = orphan;
385 return (0);
386}
387
388/*
389 * Hooks are attached, adjust to force queueing.
390 * We don't really care which hook it is.
391 * they should all be queuing for outgoing data.
392 */
393static int
394ng_ether_connect(hook_p hook)
395{
396 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
397 return (0);
398}
399
400/*
401 * Receive an incoming control message.
402 */
403static int
404ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
405{
406 const priv_p priv = NG_NODE_PRIVATE(node);
407 struct ng_mesg *resp = NULL;
408 int error = 0;
409 struct ng_mesg *msg;
410
411 NGI_GET_MSG(item, msg);
412 switch (msg->header.typecookie) {
413 case NGM_ETHER_COOKIE:
414 switch (msg->header.cmd) {
415 case NGM_ETHER_GET_IFNAME:
416 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
417 if (resp == NULL) {
418 error = ENOMEM;
419 break;
420 }
421 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ + 1);
422 break;
423 case NGM_ETHER_GET_IFINDEX:
424 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
425 if (resp == NULL) {
426 error = ENOMEM;
427 break;
428 }
429 *((u_int32_t *)resp->data) = priv->ifp->if_index;
430 break;
431 case NGM_ETHER_GET_ENADDR:
432 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
433 if (resp == NULL) {
434 error = ENOMEM;
435 break;
436 }
437 bcopy((IFP2AC(priv->ifp))->ac_enaddr,
438 resp->data, ETHER_ADDR_LEN);
439 break;
440 case NGM_ETHER_SET_ENADDR:
441 {
442 if (msg->header.arglen != ETHER_ADDR_LEN) {
443 error = EINVAL;
444 break;
445 }
446 error = if_setlladdr(priv->ifp,
447 (u_char *)msg->data, ETHER_ADDR_LEN);
448 break;
449 }
450 case NGM_ETHER_GET_PROMISC:
451 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
452 if (resp == NULL) {
453 error = ENOMEM;
454 break;
455 }
456 *((u_int32_t *)resp->data) = priv->promisc;
457 break;
458 case NGM_ETHER_SET_PROMISC:
459 {
460 u_char want;
461
462 if (msg->header.arglen != sizeof(u_int32_t)) {
463 error = EINVAL;
464 break;
465 }
466 want = !!*((u_int32_t *)msg->data);
467 if (want ^ priv->promisc) {
468 if ((error = ifpromisc(priv->ifp, want)) != 0)
469 break;
470 priv->promisc = want;
471 }
472 break;
473 }
474 case NGM_ETHER_GET_AUTOSRC:
475 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
476 if (resp == NULL) {
477 error = ENOMEM;
478 break;
479 }
480 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
481 break;
482 case NGM_ETHER_SET_AUTOSRC:
483 if (msg->header.arglen != sizeof(u_int32_t)) {
484 error = EINVAL;
485 break;
486 }
487 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
488 break;
489 default:
490 error = EINVAL;
491 break;
492 }
493 break;
494 default:
495 error = EINVAL;
496 break;
497 }
498 NG_RESPOND_MSG(error, node, item, resp);
499 NG_FREE_MSG(msg);
500 return (error);
501}
502
503/*
504 * Receive data on a hook.
505 */
506static int
507ng_ether_rcvdata(hook_p hook, item_p item)
508{
509 const node_p node = NG_HOOK_NODE(hook);
510 const priv_p priv = NG_NODE_PRIVATE(node);
511 struct mbuf *m;
512 meta_p meta;
513
514 NGI_GET_M(item, m);
515 NGI_GET_META(item, meta);
516 NG_FREE_ITEM(item);
517 if (hook == priv->lower)
518 return ng_ether_rcv_lower(node, m, meta);
519 if (hook == priv->upper)
520 return ng_ether_rcv_upper(node, m, meta);
521 panic("%s: weird hook", __func__);
522#ifdef RESTARTABLE_PANICS /* so we don;t get an error msg in LINT */
523 return NULL;
524#endif
525}
526
527/*
528 * Handle an mbuf received on the "lower" hook.
529 */
530static int
531ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
532{
533 const priv_p priv = NG_NODE_PRIVATE(node);
534 struct ifnet *const ifp = priv->ifp;
535
536 /* Discard meta info */
537 NG_FREE_META(meta);
538
539 /* Check whether interface is ready for packets */
540 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
541 NG_FREE_M(m);
542 return (ENETDOWN);
543 }
544
545 /* Make sure header is fully pulled up */
546 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
547 NG_FREE_M(m);
548 return (EINVAL);
549 }
550 if (m->m_len < sizeof(struct ether_header)
551 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
552 return (ENOBUFS);
553
554 /* Drop in the MAC address if desired */
555 if (priv->autoSrcAddr) {
556
557 /* Make the mbuf writable if it's not already */
558 if (!M_WRITABLE(m)
559 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
560 return (ENOBUFS);
561
562 /* Overwrite source MAC address */
563 bcopy((IFP2AC(ifp))->ac_enaddr,
564 mtod(m, struct ether_header *)->ether_shost,
565 ETHER_ADDR_LEN);
566 }
567
568 /* Send it on its way */
569 return ether_output_frame(ifp, m);
570}
571
572/*
573 * Handle an mbuf received on the "upper" hook.
574 */
575static int
576ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta)
577{
578 const priv_p priv = NG_NODE_PRIVATE(node);
579
580 /* Discard meta info */
581 NG_FREE_META(meta);
582
583 m->m_pkthdr.rcvif = priv->ifp;
584
585 /* Route packet back in */
586 ether_demux(priv->ifp, m);
587 return (0);
588}
589
590/*
591 * Shutdown node. This resets the node but does not remove it
592 * unless the REALLY_DIE flag is set.
593 */
594static int
595ng_ether_shutdown(node_p node)
596{
597 const priv_p priv = NG_NODE_PRIVATE(node);
598
599 if (node->nd_flags & NG_REALLY_DIE) {
600 /*
601 * WE came here because the ethernet card is being unloaded,
602 * so stop being persistant.
603 * Actually undo all the things we did on creation.
604 * Assume the ifp has already been freed.
605 */
606 NG_NODE_SET_PRIVATE(node, NULL);
607 FREE(priv, M_NETGRAPH);
608 NG_NODE_UNREF(node); /* free node itself */
609 return (0);
610 }
611 if (priv->promisc) { /* disable promiscuous mode */
612 (void)ifpromisc(priv->ifp, 0);
613 priv->promisc = 0;
614 }
615 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
616 node->nd_flags &= ~NG_INVALID; /* Signal ng_rmnode we are persisant */
617 return (0);
618}
619
620/*
621 * Hook disconnection.
622 */
623static int
624ng_ether_disconnect(hook_p hook)
625{
626 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
627
628 if (hook == priv->upper) {
629 priv->upper = NULL;
630 if (priv->ifp != NULL) /* restore h/w csum */
631 priv->ifp->if_hwassist = priv->hwassist;
632 } else if (hook == priv->lower) {
633 priv->lower = NULL;
634 priv->lowerOrphan = 0;
635 } else
636 panic("%s: weird hook", __func__);
637 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
638 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
639 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
640 return (0);
641}
642
643/******************************************************************
644 INITIALIZATION
645******************************************************************/
646
647/*
648 * Handle loading and unloading for this node type.
649 */
650static int
651ng_ether_mod_event(module_t mod, int event, void *data)
652{
653 struct ifnet *ifp;
654 int error = 0;
655 int s;
656
657 s = splnet();
658 switch (event) {
659 case MOD_LOAD:
660
661 /* Register function hooks */
662 if (ng_ether_attach_p != NULL) {
663 error = EEXIST;
664 break;
665 }
666 ng_ether_attach_p = ng_ether_attach;
667 ng_ether_detach_p = ng_ether_detach;
668 ng_ether_output_p = ng_ether_output;
669 ng_ether_input_p = ng_ether_input;
670 ng_ether_input_orphan_p = ng_ether_input_orphan;
671
672 /* Create nodes for any already-existing Ethernet interfaces */
673 IFNET_RLOCK();
674 TAILQ_FOREACH(ifp, &ifnet, if_link) {
675 if (ifp->if_type == IFT_ETHER
676 || ifp->if_type == IFT_L2VLAN)
677 ng_ether_attach(ifp);
678 }
679 IFNET_RUNLOCK();
680 break;
681
682 case MOD_UNLOAD:
683
684 /*
685 * Note that the base code won't try to unload us until
686 * all nodes have been removed, and that can't happen
687 * until all Ethernet interfaces are removed. In any
688 * case, we know there are no nodes left if the action
689 * is MOD_UNLOAD, so there's no need to detach any nodes.
690 */
691
692 /* Unregister function hooks */
693 ng_ether_attach_p = NULL;
694 ng_ether_detach_p = NULL;
695 ng_ether_output_p = NULL;
696 ng_ether_input_p = NULL;
697 ng_ether_input_orphan_p = NULL;
698 break;
699
700 default:
701 error = EOPNOTSUPP;
702 break;
703 }
704 splx(s);
705 return (error);
706}
707