1
2 /*
3 * ng_ether.c
4 */
5
6 /*-
7 * Copyright (c) 1996-2000 Whistle Communications, Inc.
8 * All rights reserved.
9 *
10 * Subject to the following obligations and disclaimer of warranty, use and
11 * redistribution of this software, in source or object code forms, with or
12 * without modifications are expressly permitted by Whistle Communications;
13 * provided, however, that:
14 * 1. Any and all reproductions of the source or object code must include the
15 * copyright notice above and the following disclaimer of warranties; and
16 * 2. No rights are granted, in any manner or form, to use Whistle
17 * Communications, Inc. trademarks, including the mark "WHISTLE
18 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
19 * such appears in the above copyright notice or in the software.
20 *
21 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
22 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
23 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
24 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
26 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
27 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
28 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
29 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
30 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
31 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
32 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
33 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
34 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
35 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
36 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
37 * OF SUCH DAMAGE.
38 *
39 * Authors: Archie Cobbs <archie@freebsd.org>
40 * Julian Elischer <julian@freebsd.org>
41 *
42 * $FreeBSD: releng/6.3/sys/netgraph/ng_ether.c 161879 2006-09-02 12:34:08Z glebius $
43 */
44
45 /*
46 * ng_ether(4) netgraph node type
47 */
48
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/kernel.h>
52 #include <sys/malloc.h>
53 #include <sys/mbuf.h>
54 #include <sys/errno.h>
55 #include <sys/syslog.h>
56 #include <sys/socket.h>
57
58 #include <net/bridge.h>
59 #include <net/if.h>
60 #include <net/if_dl.h>
61 #include <net/if_types.h>
62 #include <net/if_arp.h>
63 #include <net/if_var.h>
64 #include <net/ethernet.h>
65 #include <net/if_bridgevar.h>
66
67 #include <netgraph/ng_message.h>
68 #include <netgraph/netgraph.h>
69 #include <netgraph/ng_parse.h>
70 #include <netgraph/ng_ether.h>
71
72 #define IFP2NG(ifp) (IFP2AC((ifp))->ac_netgraph)
73
74 /* Per-node private data */
75 struct private {
76 struct ifnet *ifp; /* associated interface */
77 hook_p upper; /* upper hook connection */
78 hook_p lower; /* lower hook connection */
79 hook_p orphan; /* orphan hook connection */
80 u_char autoSrcAddr; /* always overwrite source address */
81 u_char promisc; /* promiscuous mode enabled */
82 u_long hwassist; /* hardware checksum capabilities */
83 u_int flags; /* flags e.g. really die */
84 };
85 typedef struct private *priv_p;
86
87 /* Hook pointers used by if_ethersubr.c to callback to netgraph */
88 extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
89 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
90 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
91 extern void (*ng_ether_attach_p)(struct ifnet *ifp);
92 extern void (*ng_ether_detach_p)(struct ifnet *ifp);
93 extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
94
95 /* Functional hooks called from if_ethersubr.c */
96 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
97 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
98 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
99 static void ng_ether_attach(struct ifnet *ifp);
100 static void ng_ether_detach(struct ifnet *ifp);
101 static void ng_ether_link_state(struct ifnet *ifp, int state);
102
103 /* Other functions */
104 static int ng_ether_rcv_lower(node_p node, struct mbuf *m);
105 static int ng_ether_rcv_upper(node_p node, struct mbuf *m);
106
107 /* Netgraph node methods */
108 static ng_constructor_t ng_ether_constructor;
109 static ng_rcvmsg_t ng_ether_rcvmsg;
110 static ng_shutdown_t ng_ether_shutdown;
111 static ng_newhook_t ng_ether_newhook;
112 static ng_rcvdata_t ng_ether_rcvdata;
113 static ng_disconnect_t ng_ether_disconnect;
114 static int ng_ether_mod_event(module_t mod, int event, void *data);
115
116 /* List of commands and how to convert arguments to/from ASCII */
117 static const struct ng_cmdlist ng_ether_cmdlist[] = {
118 {
119 NGM_ETHER_COOKIE,
120 NGM_ETHER_GET_IFNAME,
121 "getifname",
122 NULL,
123 &ng_parse_string_type
124 },
125 {
126 NGM_ETHER_COOKIE,
127 NGM_ETHER_GET_IFINDEX,
128 "getifindex",
129 NULL,
130 &ng_parse_int32_type
131 },
132 {
133 NGM_ETHER_COOKIE,
134 NGM_ETHER_GET_ENADDR,
135 "getenaddr",
136 NULL,
137 &ng_parse_enaddr_type
138 },
139 {
140 NGM_ETHER_COOKIE,
141 NGM_ETHER_SET_ENADDR,
142 "setenaddr",
143 &ng_parse_enaddr_type,
144 NULL
145 },
146 {
147 NGM_ETHER_COOKIE,
148 NGM_ETHER_GET_PROMISC,
149 "getpromisc",
150 NULL,
151 &ng_parse_int32_type
152 },
153 {
154 NGM_ETHER_COOKIE,
155 NGM_ETHER_SET_PROMISC,
156 "setpromisc",
157 &ng_parse_int32_type,
158 NULL
159 },
160 {
161 NGM_ETHER_COOKIE,
162 NGM_ETHER_GET_AUTOSRC,
163 "getautosrc",
164 NULL,
165 &ng_parse_int32_type
166 },
167 {
168 NGM_ETHER_COOKIE,
169 NGM_ETHER_SET_AUTOSRC,
170 "setautosrc",
171 &ng_parse_int32_type,
172 NULL
173 },
174 {
175 NGM_ETHER_COOKIE,
176 NGM_ETHER_ADD_MULTI,
177 "addmulti",
178 &ng_parse_enaddr_type,
179 NULL
180 },
181 {
182 NGM_ETHER_COOKIE,
183 NGM_ETHER_DEL_MULTI,
184 "delmulti",
185 &ng_parse_enaddr_type,
186 NULL
187 },
188 {
189 NGM_ETHER_COOKIE,
190 NGM_ETHER_DETACH,
191 "detach",
192 NULL,
193 NULL
194 },
195 { 0 }
196 };
197
198 static struct ng_type ng_ether_typestruct = {
199 .version = NG_ABI_VERSION,
200 .name = NG_ETHER_NODE_TYPE,
201 .mod_event = ng_ether_mod_event,
202 .constructor = ng_ether_constructor,
203 .rcvmsg = ng_ether_rcvmsg,
204 .shutdown = ng_ether_shutdown,
205 .newhook = ng_ether_newhook,
206 .rcvdata = ng_ether_rcvdata,
207 .disconnect = ng_ether_disconnect,
208 .cmdlist = ng_ether_cmdlist,
209 };
210 NETGRAPH_INIT(ether, &ng_ether_typestruct);
211
212 /******************************************************************
213 ETHERNET FUNCTION HOOKS
214 ******************************************************************/
215
216 /*
217 * Handle a packet that has come in on an interface. We get to
218 * look at it here before any upper layer protocols do.
219 *
220 * NOTE: this function will get called at splimp()
221 */
222 static void
223 ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
224 {
225 const node_p node = IFP2NG(ifp);
226 const priv_p priv = NG_NODE_PRIVATE(node);
227 int error;
228
229 /* If "lower" hook not connected, let packet continue */
230 if (priv->lower == NULL)
231 return;
232 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */
233 }
234
235 /*
236 * Handle a packet that has come in on an interface, and which
237 * does not match any of our known protocols (an ``orphan'').
238 *
239 * NOTE: this function will get called at splimp()
240 */
241 static void
242 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
243 {
244 const node_p node = IFP2NG(ifp);
245 const priv_p priv = NG_NODE_PRIVATE(node);
246 int error;
247
248 /* If "orphan" hook not connected, discard packet */
249 if (priv->orphan == NULL) {
250 m_freem(m);
251 return;
252 }
253 NG_SEND_DATA_ONLY(error, priv->orphan, m);
254 }
255
256 /*
257 * Handle a packet that is going out on an interface.
258 * The Ethernet header is already attached to the mbuf.
259 */
260 static int
261 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
262 {
263 const node_p node = IFP2NG(ifp);
264 const priv_p priv = NG_NODE_PRIVATE(node);
265 int error = 0;
266
267 /* If "upper" hook not connected, let packet continue */
268 if (priv->upper == NULL)
269 return (0);
270
271 /* Send it out "upper" hook */
272 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
273 return (error);
274 }
275
276 /*
277 * A new Ethernet interface has been attached.
278 * Create a new node for it, etc.
279 */
280 static void
281 ng_ether_attach(struct ifnet *ifp)
282 {
283 priv_p priv;
284 node_p node;
285
286 /* Create node */
287 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
288 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
289 log(LOG_ERR, "%s: can't %s for %s\n",
290 __func__, "create node", ifp->if_xname);
291 return;
292 }
293
294 /* Allocate private data */
295 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
296 if (priv == NULL) {
297 log(LOG_ERR, "%s: can't %s for %s\n",
298 __func__, "allocate memory", ifp->if_xname);
299 NG_NODE_UNREF(node);
300 return;
301 }
302 NG_NODE_SET_PRIVATE(node, priv);
303 priv->ifp = ifp;
304 IFP2NG(ifp) = node;
305 priv->hwassist = ifp->if_hwassist;
306
307 /* Try to give the node the same name as the interface */
308 if (ng_name_node(node, ifp->if_xname) != 0) {
309 log(LOG_WARNING, "%s: can't name node %s\n",
310 __func__, ifp->if_xname);
311 }
312 }
313
314 /*
315 * An Ethernet interface is being detached.
316 * REALLY Destroy its node.
317 */
318 static void
319 ng_ether_detach(struct ifnet *ifp)
320 {
321 const node_p node = IFP2NG(ifp);
322 const priv_p priv = NG_NODE_PRIVATE(node);
323
324 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
325 /*
326 * We can't assume the ifnet is still around when we run shutdown
327 * So zap it now. XXX We HOPE that anything running at this time
328 * handles it (as it should in the non netgraph case).
329 */
330 IFP2NG(ifp) = NULL;
331 priv->ifp = NULL; /* XXX race if interrupted an output packet */
332 ng_rmnode_self(node); /* remove all netgraph parts */
333 }
334
335 /*
336 * Notify graph about link event.
337 * if_link_state_change() has already checked that the state has changed.
338 */
339 static void
340 ng_ether_link_state(struct ifnet *ifp, int state)
341 {
342 const node_p node = IFP2NG(ifp);
343 const priv_p priv = NG_NODE_PRIVATE(node);
344 struct ng_mesg *msg;
345 int cmd, dummy_error = 0;
346
347 if (priv->lower == NULL)
348 return;
349
350 if (state == LINK_STATE_UP)
351 cmd = NGM_LINK_IS_UP;
352 else if (state == LINK_STATE_DOWN)
353 cmd = NGM_LINK_IS_DOWN;
354 else
355 return;
356
357 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
358 if (msg != NULL)
359 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0);
360 }
361
362 /******************************************************************
363 NETGRAPH NODE METHODS
364 ******************************************************************/
365
366 /*
367 * It is not possible or allowable to create a node of this type.
368 * Nodes get created when the interface is attached (or, when
369 * this node type's KLD is loaded).
370 */
371 static int
372 ng_ether_constructor(node_p node)
373 {
374 return (EINVAL);
375 }
376
377 /*
378 * Check for attaching a new hook.
379 */
380 static int
381 ng_ether_newhook(node_p node, hook_p hook, const char *name)
382 {
383 const priv_p priv = NG_NODE_PRIVATE(node);
384 hook_p *hookptr;
385
386 /* Divert hook is an alias for lower */
387 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
388 name = NG_ETHER_HOOK_LOWER;
389
390 /* Which hook? */
391 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
392 hookptr = &priv->upper;
393 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0)
394 hookptr = &priv->lower;
395 else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0)
396 hookptr = &priv->orphan;
397 else
398 return (EINVAL);
399
400 /* Check if already connected (shouldn't be, but doesn't hurt) */
401 if (*hookptr != NULL)
402 return (EISCONN);
403
404 /* Disable hardware checksums while 'upper' hook is connected */
405 if (hookptr == &priv->upper)
406 priv->ifp->if_hwassist = 0;
407
408 /* OK */
409 *hookptr = hook;
410 return (0);
411 }
412
413 /*
414 * Receive an incoming control message.
415 */
416 static int
417 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
418 {
419 const priv_p priv = NG_NODE_PRIVATE(node);
420 struct ng_mesg *resp = NULL;
421 int error = 0;
422 struct ng_mesg *msg;
423
424 NGI_GET_MSG(item, msg);
425 switch (msg->header.typecookie) {
426 case NGM_ETHER_COOKIE:
427 switch (msg->header.cmd) {
428 case NGM_ETHER_GET_IFNAME:
429 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
430 if (resp == NULL) {
431 error = ENOMEM;
432 break;
433 }
434 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
435 break;
436 case NGM_ETHER_GET_IFINDEX:
437 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
438 if (resp == NULL) {
439 error = ENOMEM;
440 break;
441 }
442 *((u_int32_t *)resp->data) = priv->ifp->if_index;
443 break;
444 case NGM_ETHER_GET_ENADDR:
445 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
446 if (resp == NULL) {
447 error = ENOMEM;
448 break;
449 }
450 bcopy(IFP2ENADDR(priv->ifp),
451 resp->data, ETHER_ADDR_LEN);
452 break;
453 case NGM_ETHER_SET_ENADDR:
454 {
455 if (msg->header.arglen != ETHER_ADDR_LEN) {
456 error = EINVAL;
457 break;
458 }
459 error = if_setlladdr(priv->ifp,
460 (u_char *)msg->data, ETHER_ADDR_LEN);
461 break;
462 }
463 case NGM_ETHER_GET_PROMISC:
464 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
465 if (resp == NULL) {
466 error = ENOMEM;
467 break;
468 }
469 *((u_int32_t *)resp->data) = priv->promisc;
470 break;
471 case NGM_ETHER_SET_PROMISC:
472 {
473 u_char want;
474
475 if (msg->header.arglen != sizeof(u_int32_t)) {
476 error = EINVAL;
477 break;
478 }
479 want = !!*((u_int32_t *)msg->data);
480 if (want ^ priv->promisc) {
481 if ((error = ifpromisc(priv->ifp, want)) != 0)
482 break;
483 priv->promisc = want;
484 }
485 break;
486 }
487 case NGM_ETHER_GET_AUTOSRC:
488 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
489 if (resp == NULL) {
490 error = ENOMEM;
491 break;
492 }
493 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
494 break;
495 case NGM_ETHER_SET_AUTOSRC:
496 if (msg->header.arglen != sizeof(u_int32_t)) {
497 error = EINVAL;
498 break;
499 }
500 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
501 break;
502 case NGM_ETHER_ADD_MULTI:
503 {
504 struct sockaddr_dl sa_dl;
505 struct ifmultiaddr *ifm;
506
507 if (msg->header.arglen != ETHER_ADDR_LEN) {
508 error = EINVAL;
509 break;
510 }
511 bzero(&sa_dl, sizeof(struct sockaddr_dl));
512 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
513 sa_dl.sdl_family = AF_LINK;
514 sa_dl.sdl_alen = ETHER_ADDR_LEN;
515 bcopy((void *)msg->data, LLADDR(&sa_dl),
516 ETHER_ADDR_LEN);
517 error = if_addmulti(priv->ifp,
518 (struct sockaddr *)&sa_dl, &ifm);
519 break;
520 }
521 case NGM_ETHER_DEL_MULTI:
522 {
523 struct sockaddr_dl sa_dl;
524
525 if (msg->header.arglen != ETHER_ADDR_LEN) {
526 error = EINVAL;
527 break;
528 }
529 bzero(&sa_dl, sizeof(struct sockaddr_dl));
530 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
531 sa_dl.sdl_family = AF_LINK;
532 sa_dl.sdl_alen = ETHER_ADDR_LEN;
533 bcopy((void *)msg->data, LLADDR(&sa_dl),
534 ETHER_ADDR_LEN);
535 error = if_delmulti(priv->ifp,
536 (struct sockaddr *)&sa_dl);
537 break;
538 }
539 case NGM_ETHER_DETACH:
540 ng_ether_detach(priv->ifp);
541 break;
542 default:
543 error = EINVAL;
544 break;
545 }
546 break;
547 default:
548 error = EINVAL;
549 break;
550 }
551 NG_RESPOND_MSG(error, node, item, resp);
552 NG_FREE_MSG(msg);
553 return (error);
554 }
555
556 /*
557 * Receive data on a hook.
558 */
559 static int
560 ng_ether_rcvdata(hook_p hook, item_p item)
561 {
562 const node_p node = NG_HOOK_NODE(hook);
563 const priv_p priv = NG_NODE_PRIVATE(node);
564 struct mbuf *m;
565
566 NGI_GET_M(item, m);
567 NG_FREE_ITEM(item);
568
569 if (hook == priv->lower || hook == priv->orphan)
570 return ng_ether_rcv_lower(node, m);
571 if (hook == priv->upper)
572 return ng_ether_rcv_upper(node, m);
573 panic("%s: weird hook", __func__);
574 #ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */
575 return (0);
576 #endif
577 }
578
579 /*
580 * Handle an mbuf received on the "lower" or "orphan" hook.
581 */
582 static int
583 ng_ether_rcv_lower(node_p node, struct mbuf *m)
584 {
585 const priv_p priv = NG_NODE_PRIVATE(node);
586 struct ifnet *const ifp = priv->ifp;
587
588 /* Check whether interface is ready for packets */
589 if (!((ifp->if_flags & IFF_UP) &&
590 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
591 NG_FREE_M(m);
592 return (ENETDOWN);
593 }
594
595 /* Make sure header is fully pulled up */
596 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
597 NG_FREE_M(m);
598 return (EINVAL);
599 }
600 if (m->m_len < sizeof(struct ether_header)
601 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
602 return (ENOBUFS);
603
604 /* Drop in the MAC address if desired */
605 if (priv->autoSrcAddr) {
606
607 /* Make the mbuf writable if it's not already */
608 if (!M_WRITABLE(m)
609 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
610 return (ENOBUFS);
611
612 /* Overwrite source MAC address */
613 bcopy(IFP2ENADDR(ifp),
614 mtod(m, struct ether_header *)->ether_shost,
615 ETHER_ADDR_LEN);
616 }
617
618 /* Send it on its way */
619 return ether_output_frame(ifp, m);
620 }
621
622 /*
623 * Handle an mbuf received on the "upper" hook.
624 */
625 static int
626 ng_ether_rcv_upper(node_p node, struct mbuf *m)
627 {
628 const priv_p priv = NG_NODE_PRIVATE(node);
629 struct ifnet *ifp = priv->ifp;
630
631 /* Check length and pull off header */
632 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
633 NG_FREE_M(m);
634 return (EINVAL);
635 }
636 if (m->m_len < sizeof(struct ether_header) &&
637 (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
638 return (ENOBUFS);
639
640 m->m_pkthdr.rcvif = ifp;
641
642 if (BDG_ACTIVE(priv->ifp) )
643 if ((m = bridge_in_ptr(priv->ifp, m)) == NULL)
644 return (0);
645
646 /* Pass the packet to the bridge, it may come back to us */
647 if (ifp->if_bridge) {
648 BRIDGE_INPUT(ifp, m);
649 if (m == NULL)
650 return (0);
651 }
652
653 /* Route packet back in */
654 ether_demux(ifp, m);
655 return (0);
656 }
657
658 /*
659 * Shutdown node. This resets the node but does not remove it
660 * unless the REALLY_DIE flag is set.
661 */
662 static int
663 ng_ether_shutdown(node_p node)
664 {
665 const priv_p priv = NG_NODE_PRIVATE(node);
666
667 if (node->nd_flags & NGF_REALLY_DIE) {
668 /*
669 * WE came here because the ethernet card is being unloaded,
670 * so stop being persistant.
671 * Actually undo all the things we did on creation.
672 * Assume the ifp has already been freed.
673 */
674 NG_NODE_SET_PRIVATE(node, NULL);
675 FREE(priv, M_NETGRAPH);
676 NG_NODE_UNREF(node); /* free node itself */
677 return (0);
678 }
679 if (priv->promisc) { /* disable promiscuous mode */
680 (void)ifpromisc(priv->ifp, 0);
681 priv->promisc = 0;
682 }
683 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
684 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */
685
686 return (0);
687 }
688
689 /*
690 * Hook disconnection.
691 */
692 static int
693 ng_ether_disconnect(hook_p hook)
694 {
695 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
696
697 if (hook == priv->upper) {
698 priv->upper = NULL;
699 if (priv->ifp != NULL) /* restore h/w csum */
700 priv->ifp->if_hwassist = priv->hwassist;
701 } else if (hook == priv->lower)
702 priv->lower = NULL;
703 else if (hook == priv->orphan)
704 priv->orphan = NULL;
705 else
706 panic("%s: weird hook", __func__);
707 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
708 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
709 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
710 return (0);
711 }
712
713 /******************************************************************
714 INITIALIZATION
715 ******************************************************************/
716
717 /*
718 * Handle loading and unloading for this node type.
719 */
720 static int
721 ng_ether_mod_event(module_t mod, int event, void *data)
722 {
723 struct ifnet *ifp;
724 int error = 0;
725 int s;
726
727 s = splnet();
728 switch (event) {
729 case MOD_LOAD:
730
731 /* Register function hooks */
732 if (ng_ether_attach_p != NULL) {
733 error = EEXIST;
734 break;
735 }
736 ng_ether_attach_p = ng_ether_attach;
737 ng_ether_detach_p = ng_ether_detach;
738 ng_ether_output_p = ng_ether_output;
739 ng_ether_input_p = ng_ether_input;
740 ng_ether_input_orphan_p = ng_ether_input_orphan;
741 ng_ether_link_state_p = ng_ether_link_state;
742
743 /* Create nodes for any already-existing Ethernet interfaces */
744 IFNET_RLOCK();
745 TAILQ_FOREACH(ifp, &ifnet, if_link) {
746 if (ifp->if_type == IFT_ETHER
747 || ifp->if_type == IFT_L2VLAN)
748 ng_ether_attach(ifp);
749 }
750 IFNET_RUNLOCK();
751 break;
752
753 case MOD_UNLOAD:
754
755 /*
756 * Note that the base code won't try to unload us until
757 * all nodes have been removed, and that can't happen
758 * until all Ethernet interfaces are removed. In any
759 * case, we know there are no nodes left if the action
760 * is MOD_UNLOAD, so there's no need to detach any nodes.
761 */
762
763 /* Unregister function hooks */
764 ng_ether_attach_p = NULL;
765 ng_ether_detach_p = NULL;
766 ng_ether_output_p = NULL;
767 ng_ether_input_p = NULL;
768 ng_ether_input_orphan_p = NULL;
769 ng_ether_link_state_p = NULL;
770 break;
771
772 default:
773 error = EOPNOTSUPP;
774 break;
775 }
776 splx(s);
777 return (error);
778 }
779
Cache object: 4cd394a11e9e84384e49c7445bf7709d
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