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 124269 2004-01-09 00:41:45Z green $
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 IFP2AC(IFP) ((struct arpcom *)IFP)
68#define IFP2NG(ifp) ((struct ng_node *)((struct arpcom *)(ifp))->ac_netgraph)
69
70/* Per-node private data */
71struct private {
72 struct ifnet *ifp; /* associated interface */
73 hook_p upper; /* upper hook connection */
74 hook_p lower; /* lower OR orphan hook connection */
75 u_char lowerOrphan; /* whether lower is lower or orphan */
76 u_char autoSrcAddr; /* always overwrite source address */
77 u_char promisc; /* promiscuous mode enabled */
78 u_long hwassist; /* hardware checksum capabilities */
79 u_int flags; /* flags e.g. really die */
80};
81typedef struct private *priv_p;
82
83/* Hook pointers used by if_ethersubr.c to callback to netgraph */
84extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
85extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
86extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
87extern void (*ng_ether_attach_p)(struct ifnet *ifp);
88extern void (*ng_ether_detach_p)(struct ifnet *ifp);
89
90/* Functional hooks called from if_ethersubr.c */
91static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
92static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
93static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
94static void ng_ether_attach(struct ifnet *ifp);
95static void ng_ether_detach(struct ifnet *ifp);
96
97/* Other functions */
98static void ng_ether_input2(node_p node, struct mbuf **mp);
99static int ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
100static int ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta);
101
102/* Netgraph node methods */
103static ng_constructor_t ng_ether_constructor;
104static ng_rcvmsg_t ng_ether_rcvmsg;
105static ng_shutdown_t ng_ether_shutdown;
106static ng_newhook_t ng_ether_newhook;
107static ng_connect_t ng_ether_connect;
108static ng_rcvdata_t ng_ether_rcvdata;
109static ng_disconnect_t ng_ether_disconnect;
110static int ng_ether_mod_event(module_t mod, int event, void *data);
111
112/* List of commands and how to convert arguments to/from ASCII */
113static const struct ng_cmdlist ng_ether_cmdlist[] = {
114 {
115 NGM_ETHER_COOKIE,
116 NGM_ETHER_GET_IFNAME,
117 "getifname",
118 NULL,
119 &ng_parse_string_type
120 },
121 {
122 NGM_ETHER_COOKIE,
123 NGM_ETHER_GET_IFINDEX,
124 "getifindex",
125 NULL,
126 &ng_parse_int32_type
127 },
128 {
129 NGM_ETHER_COOKIE,
130 NGM_ETHER_GET_ENADDR,
131 "getenaddr",
132 NULL,
133 &ng_parse_enaddr_type
134 },
135 {
136 NGM_ETHER_COOKIE,
137 NGM_ETHER_SET_ENADDR,
138 "setenaddr",
139 &ng_parse_enaddr_type,
140 NULL
141 },
142 {
143 NGM_ETHER_COOKIE,
144 NGM_ETHER_GET_PROMISC,
145 "getpromisc",
146 NULL,
147 &ng_parse_int32_type
148 },
149 {
150 NGM_ETHER_COOKIE,
151 NGM_ETHER_SET_PROMISC,
152 "setpromisc",
153 &ng_parse_int32_type,
154 NULL
155 },
156 {
157 NGM_ETHER_COOKIE,
158 NGM_ETHER_GET_AUTOSRC,
159 "getautosrc",
160 NULL,
161 &ng_parse_int32_type
162 },
163 {
164 NGM_ETHER_COOKIE,
165 NGM_ETHER_SET_AUTOSRC,
166 "setautosrc",
167 &ng_parse_int32_type,
168 NULL
169 },
170 { 0 }
171};
172
173static struct ng_type ng_ether_typestruct = {
174 NG_ABI_VERSION,
175 NG_ETHER_NODE_TYPE,
176 ng_ether_mod_event,
177 ng_ether_constructor,
178 ng_ether_rcvmsg,
179 ng_ether_shutdown,
180 ng_ether_newhook,
181 NULL,
182 ng_ether_connect,
183 ng_ether_rcvdata,
184 ng_ether_disconnect,
185 ng_ether_cmdlist,
186};
187MODULE_VERSION(ng_ether, 1);
188NETGRAPH_INIT(ether, &ng_ether_typestruct);
189
190/******************************************************************
191 ETHERNET FUNCTION HOOKS
192******************************************************************/
193
194/*
195 * Handle a packet that has come in on an interface. We get to
196 * look at it here before any upper layer protocols do.
197 *
198 * NOTE: this function will get called at splimp()
199 */
200static void
201ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
202{
203 const node_p node = IFP2NG(ifp);
204 const priv_p priv = NG_NODE_PRIVATE(node);
205
206 /* If "lower" hook not connected, let packet continue */
207 if (priv->lower == NULL || priv->lowerOrphan)
208 return;
209 ng_ether_input2(node, mp);
210}
211
212/*
213 * Handle a packet that has come in on an interface, and which
214 * does not match any of our known protocols (an ``orphan'').
215 *
216 * NOTE: this function will get called at splimp()
217 */
218static void
219ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
220{
221 const node_p node = IFP2NG(ifp);
222 const priv_p priv = NG_NODE_PRIVATE(node);
223
224 /* If "orphan" hook not connected, let packet continue */
225 if (priv->lower == NULL || !priv->lowerOrphan) {
226 m_freem(m);
227 return;
228 }
229 ng_ether_input2(node, &m);
230 if (m != NULL)
231 m_freem(m);
232}
233
234/*
235 * Handle a packet that has come in on an ethernet interface.
236 * The Ethernet header has already been detached from the mbuf,
237 * so we have to put it back.
238 *
239 * NOTE: this function will get called at splimp()
240 */
241static void
242ng_ether_input2(node_p node, struct mbuf **mp)
243{
244 const priv_p priv = NG_NODE_PRIVATE(node);
245 int error;
246
247 /* Send out lower/orphan hook */
248 NG_SEND_DATA_ONLY(error, priv->lower, *mp);
249 *mp = NULL;
250}
251
252/*
253 * Handle a packet that is going out on an interface.
254 * The Ethernet header is already attached to the mbuf.
255 */
256static int
257ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
258{
259 const node_p node = IFP2NG(ifp);
260 const priv_p priv = NG_NODE_PRIVATE(node);
261 int error = 0;
262
263 /* If "upper" hook not connected, let packet continue */
264 if (priv->upper == NULL)
265 return (0);
266
267 /* Send it out "upper" hook */
268 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
269 return (error);
270}
271
272/*
273 * A new Ethernet interface has been attached.
274 * Create a new node for it, etc.
275 */
276static void
277ng_ether_attach(struct ifnet *ifp)
278{
279 priv_p priv;
280 node_p node;
281
282 /* Create node */
283 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
284 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
285 log(LOG_ERR, "%s: can't %s for %s\n",
286 __func__, "create node", ifp->if_xname);
287 return;
288 }
289
290 /* Allocate private data */
291 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
292 if (priv == NULL) {
293 log(LOG_ERR, "%s: can't %s for %s\n",
294 __func__, "allocate memory", ifp->if_xname);
295 NG_NODE_UNREF(node);
296 return;
297 }
298 NG_NODE_SET_PRIVATE(node, priv);
299 priv->ifp = ifp;
300 IFP2NG(ifp) = node;
301 priv->autoSrcAddr = 1;
302 priv->hwassist = ifp->if_hwassist;
303
304 /* Try to give the node the same name as the interface */
305 if (ng_name_node(node, ifp->if_xname) != 0) {
306 log(LOG_WARNING, "%s: can't name node %s\n",
307 __func__, ifp->if_xname);
308 }
309}
310
311/*
312 * An Ethernet interface is being detached.
313 * REALLY Destroy its node.
314 */
315static void
316ng_ether_detach(struct ifnet *ifp)
317{
318 const node_p node = IFP2NG(ifp);
319 const priv_p priv = NG_NODE_PRIVATE(node);
320
321 if (node == NULL) /* no node (why not?), ignore */
322 return;
323 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
324 /*
325 * We can't assume the ifnet is still around when we run shutdown
326 * So zap it now. XXX We HOPE that anything running at this time
327 * handles it (as it should in the non netgraph case).
328 */
329 IFP2NG(ifp) = NULL;
330 priv->ifp = NULL; /* XXX race if interrupted an output packet */
331 ng_rmnode_self(node); /* remove all netgraph parts */
332}
333
334/******************************************************************
335 NETGRAPH NODE METHODS
336******************************************************************/
337
338/*
339 * It is not possible or allowable to create a node of this type.
340 * Nodes get created when the interface is attached (or, when
341 * this node type's KLD is loaded).
342 */
343static int
344ng_ether_constructor(node_p node)
345{
346 return (EINVAL);
347}
348
349/*
350 * Check for attaching a new hook.
351 */
352static int
353ng_ether_newhook(node_p node, hook_p hook, const char *name)
354{
355 const priv_p priv = NG_NODE_PRIVATE(node);
356 u_char orphan = priv->lowerOrphan;
357 hook_p *hookptr;
358
359 /* Divert hook is an alias for lower */
360 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
361 name = NG_ETHER_HOOK_LOWER;
362
363 /* Which hook? */
364 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
365 hookptr = &priv->upper;
366 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
367 hookptr = &priv->lower;
368 orphan = 0;
369 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
370 hookptr = &priv->lower;
371 orphan = 1;
372 } else
373 return (EINVAL);
374
375 /* Check if already connected (shouldn't be, but doesn't hurt) */
376 if (*hookptr != NULL)
377 return (EISCONN);
378
379 /* Disable hardware checksums while 'upper' hook is connected */
380 if (hookptr == &priv->upper)
381 priv->ifp->if_hwassist = 0;
382
383 /* OK */
384 *hookptr = hook;
385 priv->lowerOrphan = orphan;
386 return (0);
387}
388
389/*
390 * Hooks are attached, adjust to force queueing.
391 * We don't really care which hook it is.
392 * they should all be queuing for outgoing data.
393 */
394static int
395ng_ether_connect(hook_p hook)
396{
397 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
398 return (0);
399}
400
401/*
402 * Receive an incoming control message.
403 */
404static int
405ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
406{
407 const priv_p priv = NG_NODE_PRIVATE(node);
408 struct ng_mesg *resp = NULL;
409 int error = 0;
410 struct ng_mesg *msg;
411
412 NGI_GET_MSG(item, msg);
413 switch (msg->header.typecookie) {
414 case NGM_ETHER_COOKIE:
415 switch (msg->header.cmd) {
416 case NGM_ETHER_GET_IFNAME:
417 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
418 if (resp == NULL) {
419 error = ENOMEM;
420 break;
421 }
422 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ + 1);
423 break;
424 case NGM_ETHER_GET_IFINDEX:
425 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
426 if (resp == NULL) {
427 error = ENOMEM;
428 break;
429 }
430 *((u_int32_t *)resp->data) = priv->ifp->if_index;
431 break;
432 case NGM_ETHER_GET_ENADDR:
433 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
434 if (resp == NULL) {
435 error = ENOMEM;
436 break;
437 }
438 bcopy((IFP2AC(priv->ifp))->ac_enaddr,
439 resp->data, ETHER_ADDR_LEN);
440 break;
441 case NGM_ETHER_SET_ENADDR:
442 {
443 if (msg->header.arglen != ETHER_ADDR_LEN) {
444 error = EINVAL;
445 break;
446 }
447 error = if_setlladdr(priv->ifp,
448 (u_char *)msg->data, ETHER_ADDR_LEN);
449 break;
450 }
451 case NGM_ETHER_GET_PROMISC:
452 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
453 if (resp == NULL) {
454 error = ENOMEM;
455 break;
456 }
457 *((u_int32_t *)resp->data) = priv->promisc;
458 break;
459 case NGM_ETHER_SET_PROMISC:
460 {
461 u_char want;
462
463 if (msg->header.arglen != sizeof(u_int32_t)) {
464 error = EINVAL;
465 break;
466 }
467 want = !!*((u_int32_t *)msg->data);
468 if (want ^ priv->promisc) {
469 if ((error = ifpromisc(priv->ifp, want)) != 0)
470 break;
471 priv->promisc = want;
472 }
473 break;
474 }
475 case NGM_ETHER_GET_AUTOSRC:
476 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
477 if (resp == NULL) {
478 error = ENOMEM;
479 break;
480 }
481 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
482 break;
483 case NGM_ETHER_SET_AUTOSRC:
484 if (msg->header.arglen != sizeof(u_int32_t)) {
485 error = EINVAL;
486 break;
487 }
488 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
489 break;
490 default:
491 error = EINVAL;
492 break;
493 }
494 break;
495 default:
496 error = EINVAL;
497 break;
498 }
499 NG_RESPOND_MSG(error, node, item, resp);
500 NG_FREE_MSG(msg);
501 return (error);
502}
503
504/*
505 * Receive data on a hook.
506 */
507static int
508ng_ether_rcvdata(hook_p hook, item_p item)
509{
510 const node_p node = NG_HOOK_NODE(hook);
511 const priv_p priv = NG_NODE_PRIVATE(node);
512 struct mbuf *m;
513 meta_p meta;
514
515 NGI_GET_M(item, m);
516 NGI_GET_META(item, meta);
517 NG_FREE_ITEM(item);
518 if (hook == priv->lower)
519 return ng_ether_rcv_lower(node, m, meta);
520 if (hook == priv->upper)
521 return ng_ether_rcv_upper(node, m, meta);
522 panic("%s: weird hook", __func__);
523#ifdef RESTARTABLE_PANICS /* so we don;t get an error msg in LINT */
524 return NULL;
525#endif
526}
527
528/*
529 * Handle an mbuf received on the "lower" hook.
530 */
531static int
532ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
533{
534 const priv_p priv = NG_NODE_PRIVATE(node);
535 struct ifnet *const ifp = priv->ifp;
536
537 /* Discard meta info */
538 NG_FREE_META(meta);
539
540 /* Check whether interface is ready for packets */
541 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
542 NG_FREE_M(m);
543 return (ENETDOWN);
544 }
545
546 /* Make sure header is fully pulled up */
547 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
548 NG_FREE_M(m);
549 return (EINVAL);
550 }
551 if (m->m_len < sizeof(struct ether_header)
552 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
553 return (ENOBUFS);
554
555 /* Drop in the MAC address if desired */
556 if (priv->autoSrcAddr) {
557
558 /* Make the mbuf writable if it's not already */
559 if (!M_WRITABLE(m)
560 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
561 return (ENOBUFS);
562
563 /* Overwrite source MAC address */
564 bcopy((IFP2AC(ifp))->ac_enaddr,
565 mtod(m, struct ether_header *)->ether_shost,
566 ETHER_ADDR_LEN);
567 }
568
569 /* Send it on its way */
570 return ether_output_frame(ifp, m);
571}
572
573/*
574 * Handle an mbuf received on the "upper" hook.
575 */
576static int
577ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta)
578{
579 const priv_p priv = NG_NODE_PRIVATE(node);
580
581 /* Discard meta info */
582 NG_FREE_META(meta);
583
584 m->m_pkthdr.rcvif = priv->ifp;
585
586 /* Route packet back in */
587 ether_demux(priv->ifp, m);
588 return (0);
589}
590
591/*
592 * Shutdown node. This resets the node but does not remove it
593 * unless the REALLY_DIE flag is set.
594 */
595static int
596ng_ether_shutdown(node_p node)
597{
598 const priv_p priv = NG_NODE_PRIVATE(node);
599
600 if (node->nd_flags & NG_REALLY_DIE) {
601 /*
602 * WE came here because the ethernet card is being unloaded,
603 * so stop being persistant.
604 * Actually undo all the things we did on creation.
605 * Assume the ifp has already been freed.
606 */
607 NG_NODE_SET_PRIVATE(node, NULL);
608 FREE(priv, M_NETGRAPH);
609 NG_NODE_UNREF(node); /* free node itself */
610 return (0);
611 }
612 if (priv->promisc) { /* disable promiscuous mode */
613 (void)ifpromisc(priv->ifp, 0);
614 priv->promisc = 0;
615 }
616 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
617 node->nd_flags &= ~NG_INVALID; /* Signal ng_rmnode we are persisant */
618 return (0);
619}
620
621/*
622 * Hook disconnection.
623 */
624static int
625ng_ether_disconnect(hook_p hook)
626{
627 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
628
629 if (hook == priv->upper) {
630 priv->upper = NULL;
631 priv->ifp->if_hwassist = priv->hwassist; /* restore h/w csum */
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 124269 2004-01-09 00:41:45Z green $
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 IFP2AC(IFP) ((struct arpcom *)IFP)
68#define IFP2NG(ifp) ((struct ng_node *)((struct arpcom *)(ifp))->ac_netgraph)
69
70/* Per-node private data */
71struct private {
72 struct ifnet *ifp; /* associated interface */
73 hook_p upper; /* upper hook connection */
74 hook_p lower; /* lower OR orphan hook connection */
75 u_char lowerOrphan; /* whether lower is lower or orphan */
76 u_char autoSrcAddr; /* always overwrite source address */
77 u_char promisc; /* promiscuous mode enabled */
78 u_long hwassist; /* hardware checksum capabilities */
79 u_int flags; /* flags e.g. really die */
80};
81typedef struct private *priv_p;
82
83/* Hook pointers used by if_ethersubr.c to callback to netgraph */
84extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
85extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
86extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
87extern void (*ng_ether_attach_p)(struct ifnet *ifp);
88extern void (*ng_ether_detach_p)(struct ifnet *ifp);
89
90/* Functional hooks called from if_ethersubr.c */
91static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
92static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
93static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
94static void ng_ether_attach(struct ifnet *ifp);
95static void ng_ether_detach(struct ifnet *ifp);
96
97/* Other functions */
98static void ng_ether_input2(node_p node, struct mbuf **mp);
99static int ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
100static int ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta);
101
102/* Netgraph node methods */
103static ng_constructor_t ng_ether_constructor;
104static ng_rcvmsg_t ng_ether_rcvmsg;
105static ng_shutdown_t ng_ether_shutdown;
106static ng_newhook_t ng_ether_newhook;
107static ng_connect_t ng_ether_connect;
108static ng_rcvdata_t ng_ether_rcvdata;
109static ng_disconnect_t ng_ether_disconnect;
110static int ng_ether_mod_event(module_t mod, int event, void *data);
111
112/* List of commands and how to convert arguments to/from ASCII */
113static const struct ng_cmdlist ng_ether_cmdlist[] = {
114 {
115 NGM_ETHER_COOKIE,
116 NGM_ETHER_GET_IFNAME,
117 "getifname",
118 NULL,
119 &ng_parse_string_type
120 },
121 {
122 NGM_ETHER_COOKIE,
123 NGM_ETHER_GET_IFINDEX,
124 "getifindex",
125 NULL,
126 &ng_parse_int32_type
127 },
128 {
129 NGM_ETHER_COOKIE,
130 NGM_ETHER_GET_ENADDR,
131 "getenaddr",
132 NULL,
133 &ng_parse_enaddr_type
134 },
135 {
136 NGM_ETHER_COOKIE,
137 NGM_ETHER_SET_ENADDR,
138 "setenaddr",
139 &ng_parse_enaddr_type,
140 NULL
141 },
142 {
143 NGM_ETHER_COOKIE,
144 NGM_ETHER_GET_PROMISC,
145 "getpromisc",
146 NULL,
147 &ng_parse_int32_type
148 },
149 {
150 NGM_ETHER_COOKIE,
151 NGM_ETHER_SET_PROMISC,
152 "setpromisc",
153 &ng_parse_int32_type,
154 NULL
155 },
156 {
157 NGM_ETHER_COOKIE,
158 NGM_ETHER_GET_AUTOSRC,
159 "getautosrc",
160 NULL,
161 &ng_parse_int32_type
162 },
163 {
164 NGM_ETHER_COOKIE,
165 NGM_ETHER_SET_AUTOSRC,
166 "setautosrc",
167 &ng_parse_int32_type,
168 NULL
169 },
170 { 0 }
171};
172
173static struct ng_type ng_ether_typestruct = {
174 NG_ABI_VERSION,
175 NG_ETHER_NODE_TYPE,
176 ng_ether_mod_event,
177 ng_ether_constructor,
178 ng_ether_rcvmsg,
179 ng_ether_shutdown,
180 ng_ether_newhook,
181 NULL,
182 ng_ether_connect,
183 ng_ether_rcvdata,
184 ng_ether_disconnect,
185 ng_ether_cmdlist,
186};
187MODULE_VERSION(ng_ether, 1);
188NETGRAPH_INIT(ether, &ng_ether_typestruct);
189
190/******************************************************************
191 ETHERNET FUNCTION HOOKS
192******************************************************************/
193
194/*
195 * Handle a packet that has come in on an interface. We get to
196 * look at it here before any upper layer protocols do.
197 *
198 * NOTE: this function will get called at splimp()
199 */
200static void
201ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
202{
203 const node_p node = IFP2NG(ifp);
204 const priv_p priv = NG_NODE_PRIVATE(node);
205
206 /* If "lower" hook not connected, let packet continue */
207 if (priv->lower == NULL || priv->lowerOrphan)
208 return;
209 ng_ether_input2(node, mp);
210}
211
212/*
213 * Handle a packet that has come in on an interface, and which
214 * does not match any of our known protocols (an ``orphan'').
215 *
216 * NOTE: this function will get called at splimp()
217 */
218static void
219ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
220{
221 const node_p node = IFP2NG(ifp);
222 const priv_p priv = NG_NODE_PRIVATE(node);
223
224 /* If "orphan" hook not connected, let packet continue */
225 if (priv->lower == NULL || !priv->lowerOrphan) {
226 m_freem(m);
227 return;
228 }
229 ng_ether_input2(node, &m);
230 if (m != NULL)
231 m_freem(m);
232}
233
234/*
235 * Handle a packet that has come in on an ethernet interface.
236 * The Ethernet header has already been detached from the mbuf,
237 * so we have to put it back.
238 *
239 * NOTE: this function will get called at splimp()
240 */
241static void
242ng_ether_input2(node_p node, struct mbuf **mp)
243{
244 const priv_p priv = NG_NODE_PRIVATE(node);
245 int error;
246
247 /* Send out lower/orphan hook */
248 NG_SEND_DATA_ONLY(error, priv->lower, *mp);
249 *mp = NULL;
250}
251
252/*
253 * Handle a packet that is going out on an interface.
254 * The Ethernet header is already attached to the mbuf.
255 */
256static int
257ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
258{
259 const node_p node = IFP2NG(ifp);
260 const priv_p priv = NG_NODE_PRIVATE(node);
261 int error = 0;
262
263 /* If "upper" hook not connected, let packet continue */
264 if (priv->upper == NULL)
265 return (0);
266
267 /* Send it out "upper" hook */
268 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
269 return (error);
270}
271
272/*
273 * A new Ethernet interface has been attached.
274 * Create a new node for it, etc.
275 */
276static void
277ng_ether_attach(struct ifnet *ifp)
278{
279 priv_p priv;
280 node_p node;
281
282 /* Create node */
283 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
284 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
285 log(LOG_ERR, "%s: can't %s for %s\n",
286 __func__, "create node", ifp->if_xname);
287 return;
288 }
289
290 /* Allocate private data */
291 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
292 if (priv == NULL) {
293 log(LOG_ERR, "%s: can't %s for %s\n",
294 __func__, "allocate memory", ifp->if_xname);
295 NG_NODE_UNREF(node);
296 return;
297 }
298 NG_NODE_SET_PRIVATE(node, priv);
299 priv->ifp = ifp;
300 IFP2NG(ifp) = node;
301 priv->autoSrcAddr = 1;
302 priv->hwassist = ifp->if_hwassist;
303
304 /* Try to give the node the same name as the interface */
305 if (ng_name_node(node, ifp->if_xname) != 0) {
306 log(LOG_WARNING, "%s: can't name node %s\n",
307 __func__, ifp->if_xname);
308 }
309}
310
311/*
312 * An Ethernet interface is being detached.
313 * REALLY Destroy its node.
314 */
315static void
316ng_ether_detach(struct ifnet *ifp)
317{
318 const node_p node = IFP2NG(ifp);
319 const priv_p priv = NG_NODE_PRIVATE(node);
320
321 if (node == NULL) /* no node (why not?), ignore */
322 return;
323 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
324 /*
325 * We can't assume the ifnet is still around when we run shutdown
326 * So zap it now. XXX We HOPE that anything running at this time
327 * handles it (as it should in the non netgraph case).
328 */
329 IFP2NG(ifp) = NULL;
330 priv->ifp = NULL; /* XXX race if interrupted an output packet */
331 ng_rmnode_self(node); /* remove all netgraph parts */
332}
333
334/******************************************************************
335 NETGRAPH NODE METHODS
336******************************************************************/
337
338/*
339 * It is not possible or allowable to create a node of this type.
340 * Nodes get created when the interface is attached (or, when
341 * this node type's KLD is loaded).
342 */
343static int
344ng_ether_constructor(node_p node)
345{
346 return (EINVAL);
347}
348
349/*
350 * Check for attaching a new hook.
351 */
352static int
353ng_ether_newhook(node_p node, hook_p hook, const char *name)
354{
355 const priv_p priv = NG_NODE_PRIVATE(node);
356 u_char orphan = priv->lowerOrphan;
357 hook_p *hookptr;
358
359 /* Divert hook is an alias for lower */
360 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
361 name = NG_ETHER_HOOK_LOWER;
362
363 /* Which hook? */
364 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
365 hookptr = &priv->upper;
366 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
367 hookptr = &priv->lower;
368 orphan = 0;
369 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
370 hookptr = &priv->lower;
371 orphan = 1;
372 } else
373 return (EINVAL);
374
375 /* Check if already connected (shouldn't be, but doesn't hurt) */
376 if (*hookptr != NULL)
377 return (EISCONN);
378
379 /* Disable hardware checksums while 'upper' hook is connected */
380 if (hookptr == &priv->upper)
381 priv->ifp->if_hwassist = 0;
382
383 /* OK */
384 *hookptr = hook;
385 priv->lowerOrphan = orphan;
386 return (0);
387}
388
389/*
390 * Hooks are attached, adjust to force queueing.
391 * We don't really care which hook it is.
392 * they should all be queuing for outgoing data.
393 */
394static int
395ng_ether_connect(hook_p hook)
396{
397 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
398 return (0);
399}
400
401/*
402 * Receive an incoming control message.
403 */
404static int
405ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
406{
407 const priv_p priv = NG_NODE_PRIVATE(node);
408 struct ng_mesg *resp = NULL;
409 int error = 0;
410 struct ng_mesg *msg;
411
412 NGI_GET_MSG(item, msg);
413 switch (msg->header.typecookie) {
414 case NGM_ETHER_COOKIE:
415 switch (msg->header.cmd) {
416 case NGM_ETHER_GET_IFNAME:
417 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
418 if (resp == NULL) {
419 error = ENOMEM;
420 break;
421 }
422 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ + 1);
423 break;
424 case NGM_ETHER_GET_IFINDEX:
425 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
426 if (resp == NULL) {
427 error = ENOMEM;
428 break;
429 }
430 *((u_int32_t *)resp->data) = priv->ifp->if_index;
431 break;
432 case NGM_ETHER_GET_ENADDR:
433 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
434 if (resp == NULL) {
435 error = ENOMEM;
436 break;
437 }
438 bcopy((IFP2AC(priv->ifp))->ac_enaddr,
439 resp->data, ETHER_ADDR_LEN);
440 break;
441 case NGM_ETHER_SET_ENADDR:
442 {
443 if (msg->header.arglen != ETHER_ADDR_LEN) {
444 error = EINVAL;
445 break;
446 }
447 error = if_setlladdr(priv->ifp,
448 (u_char *)msg->data, ETHER_ADDR_LEN);
449 break;
450 }
451 case NGM_ETHER_GET_PROMISC:
452 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
453 if (resp == NULL) {
454 error = ENOMEM;
455 break;
456 }
457 *((u_int32_t *)resp->data) = priv->promisc;
458 break;
459 case NGM_ETHER_SET_PROMISC:
460 {
461 u_char want;
462
463 if (msg->header.arglen != sizeof(u_int32_t)) {
464 error = EINVAL;
465 break;
466 }
467 want = !!*((u_int32_t *)msg->data);
468 if (want ^ priv->promisc) {
469 if ((error = ifpromisc(priv->ifp, want)) != 0)
470 break;
471 priv->promisc = want;
472 }
473 break;
474 }
475 case NGM_ETHER_GET_AUTOSRC:
476 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
477 if (resp == NULL) {
478 error = ENOMEM;
479 break;
480 }
481 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
482 break;
483 case NGM_ETHER_SET_AUTOSRC:
484 if (msg->header.arglen != sizeof(u_int32_t)) {
485 error = EINVAL;
486 break;
487 }
488 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
489 break;
490 default:
491 error = EINVAL;
492 break;
493 }
494 break;
495 default:
496 error = EINVAL;
497 break;
498 }
499 NG_RESPOND_MSG(error, node, item, resp);
500 NG_FREE_MSG(msg);
501 return (error);
502}
503
504/*
505 * Receive data on a hook.
506 */
507static int
508ng_ether_rcvdata(hook_p hook, item_p item)
509{
510 const node_p node = NG_HOOK_NODE(hook);
511 const priv_p priv = NG_NODE_PRIVATE(node);
512 struct mbuf *m;
513 meta_p meta;
514
515 NGI_GET_M(item, m);
516 NGI_GET_META(item, meta);
517 NG_FREE_ITEM(item);
518 if (hook == priv->lower)
519 return ng_ether_rcv_lower(node, m, meta);
520 if (hook == priv->upper)
521 return ng_ether_rcv_upper(node, m, meta);
522 panic("%s: weird hook", __func__);
523#ifdef RESTARTABLE_PANICS /* so we don;t get an error msg in LINT */
524 return NULL;
525#endif
526}
527
528/*
529 * Handle an mbuf received on the "lower" hook.
530 */
531static int
532ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
533{
534 const priv_p priv = NG_NODE_PRIVATE(node);
535 struct ifnet *const ifp = priv->ifp;
536
537 /* Discard meta info */
538 NG_FREE_META(meta);
539
540 /* Check whether interface is ready for packets */
541 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
542 NG_FREE_M(m);
543 return (ENETDOWN);
544 }
545
546 /* Make sure header is fully pulled up */
547 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
548 NG_FREE_M(m);
549 return (EINVAL);
550 }
551 if (m->m_len < sizeof(struct ether_header)
552 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
553 return (ENOBUFS);
554
555 /* Drop in the MAC address if desired */
556 if (priv->autoSrcAddr) {
557
558 /* Make the mbuf writable if it's not already */
559 if (!M_WRITABLE(m)
560 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
561 return (ENOBUFS);
562
563 /* Overwrite source MAC address */
564 bcopy((IFP2AC(ifp))->ac_enaddr,
565 mtod(m, struct ether_header *)->ether_shost,
566 ETHER_ADDR_LEN);
567 }
568
569 /* Send it on its way */
570 return ether_output_frame(ifp, m);
571}
572
573/*
574 * Handle an mbuf received on the "upper" hook.
575 */
576static int
577ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta)
578{
579 const priv_p priv = NG_NODE_PRIVATE(node);
580
581 /* Discard meta info */
582 NG_FREE_META(meta);
583
584 m->m_pkthdr.rcvif = priv->ifp;
585
586 /* Route packet back in */
587 ether_demux(priv->ifp, m);
588 return (0);
589}
590
591/*
592 * Shutdown node. This resets the node but does not remove it
593 * unless the REALLY_DIE flag is set.
594 */
595static int
596ng_ether_shutdown(node_p node)
597{
598 const priv_p priv = NG_NODE_PRIVATE(node);
599
600 if (node->nd_flags & NG_REALLY_DIE) {
601 /*
602 * WE came here because the ethernet card is being unloaded,
603 * so stop being persistant.
604 * Actually undo all the things we did on creation.
605 * Assume the ifp has already been freed.
606 */
607 NG_NODE_SET_PRIVATE(node, NULL);
608 FREE(priv, M_NETGRAPH);
609 NG_NODE_UNREF(node); /* free node itself */
610 return (0);
611 }
612 if (priv->promisc) { /* disable promiscuous mode */
613 (void)ifpromisc(priv->ifp, 0);
614 priv->promisc = 0;
615 }
616 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
617 node->nd_flags &= ~NG_INVALID; /* Signal ng_rmnode we are persisant */
618 return (0);
619}
620
621/*
622 * Hook disconnection.
623 */
624static int
625ng_ether_disconnect(hook_p hook)
626{
627 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
628
629 if (hook == priv->upper) {
630 priv->upper = NULL;
631 priv->ifp->if_hwassist = priv->hwassist; /* restore h/w csum */
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