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 * $FreeBSD$
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/if.h>
59 #include <net/if_dl.h>
60 #include <net/if_types.h>
61 #include <net/if_arp.h>
62 #include <net/if_var.h>
63 #include <net/ethernet.h>
64 #include <net/if_bridgevar.h>
65
66 #include <netgraph/ng_message.h>
67 #include <netgraph/netgraph.h>
68 #include <netgraph/ng_parse.h>
69 #include <netgraph/ng_ether.h>
70
71 #define IFP2NG(ifp) (IFP2AC((ifp))->ac_netgraph)
72
73 /* Per-node private data */
74 struct private {
75 struct ifnet *ifp; /* associated interface */
76 hook_p upper; /* upper hook connection */
77 hook_p lower; /* lower hook connection */
78 hook_p orphan; /* orphan hook connection */
79 u_char autoSrcAddr; /* always overwrite source address */
80 u_char promisc; /* promiscuous mode enabled */
81 u_long hwassist; /* hardware checksum capabilities */
82 u_int flags; /* flags e.g. really die */
83 };
84 typedef struct private *priv_p;
85
86 /* Hook pointers used by if_ethersubr.c to callback to netgraph */
87 extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
88 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
89 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
90 extern void (*ng_ether_attach_p)(struct ifnet *ifp);
91 extern void (*ng_ether_detach_p)(struct ifnet *ifp);
92 extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
93
94 /* Functional hooks called from if_ethersubr.c */
95 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
96 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
97 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
98 static void ng_ether_attach(struct ifnet *ifp);
99 static void ng_ether_detach(struct ifnet *ifp);
100 static void ng_ether_link_state(struct ifnet *ifp, int state);
101
102 /* Other functions */
103 static int ng_ether_rcv_lower(node_p node, struct mbuf *m);
104 static int ng_ether_rcv_upper(node_p node, struct mbuf *m);
105
106 /* Netgraph node methods */
107 static ng_constructor_t ng_ether_constructor;
108 static ng_rcvmsg_t ng_ether_rcvmsg;
109 static ng_shutdown_t ng_ether_shutdown;
110 static ng_newhook_t ng_ether_newhook;
111 static ng_rcvdata_t ng_ether_rcvdata;
112 static ng_disconnect_t ng_ether_disconnect;
113 static int ng_ether_mod_event(module_t mod, int event, void *data);
114
115 /* List of commands and how to convert arguments to/from ASCII */
116 static const struct ng_cmdlist ng_ether_cmdlist[] = {
117 {
118 NGM_ETHER_COOKIE,
119 NGM_ETHER_GET_IFNAME,
120 "getifname",
121 NULL,
122 &ng_parse_string_type
123 },
124 {
125 NGM_ETHER_COOKIE,
126 NGM_ETHER_GET_IFINDEX,
127 "getifindex",
128 NULL,
129 &ng_parse_int32_type
130 },
131 {
132 NGM_ETHER_COOKIE,
133 NGM_ETHER_GET_ENADDR,
134 "getenaddr",
135 NULL,
136 &ng_parse_enaddr_type
137 },
138 {
139 NGM_ETHER_COOKIE,
140 NGM_ETHER_SET_ENADDR,
141 "setenaddr",
142 &ng_parse_enaddr_type,
143 NULL
144 },
145 {
146 NGM_ETHER_COOKIE,
147 NGM_ETHER_GET_PROMISC,
148 "getpromisc",
149 NULL,
150 &ng_parse_int32_type
151 },
152 {
153 NGM_ETHER_COOKIE,
154 NGM_ETHER_SET_PROMISC,
155 "setpromisc",
156 &ng_parse_int32_type,
157 NULL
158 },
159 {
160 NGM_ETHER_COOKIE,
161 NGM_ETHER_GET_AUTOSRC,
162 "getautosrc",
163 NULL,
164 &ng_parse_int32_type
165 },
166 {
167 NGM_ETHER_COOKIE,
168 NGM_ETHER_SET_AUTOSRC,
169 "setautosrc",
170 &ng_parse_int32_type,
171 NULL
172 },
173 {
174 NGM_ETHER_COOKIE,
175 NGM_ETHER_ADD_MULTI,
176 "addmulti",
177 &ng_parse_enaddr_type,
178 NULL
179 },
180 {
181 NGM_ETHER_COOKIE,
182 NGM_ETHER_DEL_MULTI,
183 "delmulti",
184 &ng_parse_enaddr_type,
185 NULL
186 },
187 {
188 NGM_ETHER_COOKIE,
189 NGM_ETHER_DETACH,
190 "detach",
191 NULL,
192 NULL
193 },
194 { 0 }
195 };
196
197 static struct ng_type ng_ether_typestruct = {
198 .version = NG_ABI_VERSION,
199 .name = NG_ETHER_NODE_TYPE,
200 .mod_event = ng_ether_mod_event,
201 .constructor = ng_ether_constructor,
202 .rcvmsg = ng_ether_rcvmsg,
203 .shutdown = ng_ether_shutdown,
204 .newhook = ng_ether_newhook,
205 .rcvdata = ng_ether_rcvdata,
206 .disconnect = ng_ether_disconnect,
207 .cmdlist = ng_ether_cmdlist,
208 };
209 NETGRAPH_INIT(ether, &ng_ether_typestruct);
210
211 /******************************************************************
212 ETHERNET FUNCTION HOOKS
213 ******************************************************************/
214
215 /*
216 * Handle a packet that has come in on an interface. We get to
217 * look at it here before any upper layer protocols do.
218 *
219 * NOTE: this function will get called at splimp()
220 */
221 static void
222 ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
223 {
224 const node_p node = IFP2NG(ifp);
225 const priv_p priv = NG_NODE_PRIVATE(node);
226 int error;
227
228 /* If "lower" hook not connected, let packet continue */
229 if (priv->lower == NULL)
230 return;
231 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */
232 }
233
234 /*
235 * Handle a packet that has come in on an interface, and which
236 * does not match any of our known protocols (an ``orphan'').
237 *
238 * NOTE: this function will get called at splimp()
239 */
240 static void
241 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
242 {
243 const node_p node = IFP2NG(ifp);
244 const priv_p priv = NG_NODE_PRIVATE(node);
245 int error;
246
247 /* If "orphan" hook not connected, discard packet */
248 if (priv->orphan == NULL) {
249 m_freem(m);
250 return;
251 }
252 NG_SEND_DATA_ONLY(error, priv->orphan, m);
253 }
254
255 /*
256 * Handle a packet that is going out on an interface.
257 * The Ethernet header is already attached to the mbuf.
258 */
259 static int
260 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
261 {
262 const node_p node = IFP2NG(ifp);
263 const priv_p priv = NG_NODE_PRIVATE(node);
264 int error = 0;
265
266 /* If "upper" hook not connected, let packet continue */
267 if (priv->upper == NULL)
268 return (0);
269
270 /* Send it out "upper" hook */
271 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
272 return (error);
273 }
274
275 /*
276 * A new Ethernet interface has been attached.
277 * Create a new node for it, etc.
278 */
279 static void
280 ng_ether_attach(struct ifnet *ifp)
281 {
282 priv_p priv;
283 node_p node;
284
285 /* Create node */
286 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
287 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
288 log(LOG_ERR, "%s: can't %s for %s\n",
289 __func__, "create node", ifp->if_xname);
290 return;
291 }
292
293 /* Allocate private data */
294 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
295 if (priv == NULL) {
296 log(LOG_ERR, "%s: can't %s for %s\n",
297 __func__, "allocate memory", ifp->if_xname);
298 NG_NODE_UNREF(node);
299 return;
300 }
301 NG_NODE_SET_PRIVATE(node, priv);
302 priv->ifp = ifp;
303 IFP2NG(ifp) = node;
304 priv->hwassist = ifp->if_hwassist;
305
306 /* Try to give the node the same name as the interface */
307 if (ng_name_node(node, ifp->if_xname) != 0) {
308 log(LOG_WARNING, "%s: can't name node %s\n",
309 __func__, ifp->if_xname);
310 }
311 }
312
313 /*
314 * An Ethernet interface is being detached.
315 * REALLY Destroy its node.
316 */
317 static void
318 ng_ether_detach(struct ifnet *ifp)
319 {
320 const node_p node = IFP2NG(ifp);
321 const priv_p priv = NG_NODE_PRIVATE(node);
322
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 * Notify graph about link event.
336 * if_link_state_change() has already checked that the state has changed.
337 */
338 static void
339 ng_ether_link_state(struct ifnet *ifp, int state)
340 {
341 const node_p node = IFP2NG(ifp);
342 const priv_p priv = NG_NODE_PRIVATE(node);
343 struct ng_mesg *msg;
344 int cmd, dummy_error = 0;
345
346 if (priv->lower == NULL)
347 return;
348
349 if (state == LINK_STATE_UP)
350 cmd = NGM_LINK_IS_UP;
351 else if (state == LINK_STATE_DOWN)
352 cmd = NGM_LINK_IS_DOWN;
353 else
354 return;
355
356 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
357 if (msg != NULL)
358 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0);
359 }
360
361 /******************************************************************
362 NETGRAPH NODE METHODS
363 ******************************************************************/
364
365 /*
366 * It is not possible or allowable to create a node of this type.
367 * Nodes get created when the interface is attached (or, when
368 * this node type's KLD is loaded).
369 */
370 static int
371 ng_ether_constructor(node_p node)
372 {
373 return (EINVAL);
374 }
375
376 /*
377 * Check for attaching a new hook.
378 */
379 static int
380 ng_ether_newhook(node_p node, hook_p hook, const char *name)
381 {
382 const priv_p priv = NG_NODE_PRIVATE(node);
383 hook_p *hookptr;
384
385 /* Divert hook is an alias for lower */
386 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
387 name = NG_ETHER_HOOK_LOWER;
388
389 /* Which hook? */
390 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
391 hookptr = &priv->upper;
392 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0)
393 hookptr = &priv->lower;
394 else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0)
395 hookptr = &priv->orphan;
396 else
397 return (EINVAL);
398
399 /* Check if already connected (shouldn't be, but doesn't hurt) */
400 if (*hookptr != NULL)
401 return (EISCONN);
402
403 /* Disable hardware checksums while 'upper' hook is connected */
404 if (hookptr == &priv->upper)
405 priv->ifp->if_hwassist = 0;
406
407 /* OK */
408 *hookptr = hook;
409 return (0);
410 }
411
412 /*
413 * Receive an incoming control message.
414 */
415 static int
416 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
417 {
418 const priv_p priv = NG_NODE_PRIVATE(node);
419 struct ng_mesg *resp = NULL;
420 int error = 0;
421 struct ng_mesg *msg;
422
423 NGI_GET_MSG(item, msg);
424 switch (msg->header.typecookie) {
425 case NGM_ETHER_COOKIE:
426 switch (msg->header.cmd) {
427 case NGM_ETHER_GET_IFNAME:
428 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
429 if (resp == NULL) {
430 error = ENOMEM;
431 break;
432 }
433 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
434 break;
435 case NGM_ETHER_GET_IFINDEX:
436 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
437 if (resp == NULL) {
438 error = ENOMEM;
439 break;
440 }
441 *((u_int32_t *)resp->data) = priv->ifp->if_index;
442 break;
443 case NGM_ETHER_GET_ENADDR:
444 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
445 if (resp == NULL) {
446 error = ENOMEM;
447 break;
448 }
449 bcopy(IF_LLADDR(priv->ifp),
450 resp->data, ETHER_ADDR_LEN);
451 break;
452 case NGM_ETHER_SET_ENADDR:
453 {
454 if (msg->header.arglen != ETHER_ADDR_LEN) {
455 error = EINVAL;
456 break;
457 }
458 error = if_setlladdr(priv->ifp,
459 (u_char *)msg->data, ETHER_ADDR_LEN);
460 break;
461 }
462 case NGM_ETHER_GET_PROMISC:
463 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
464 if (resp == NULL) {
465 error = ENOMEM;
466 break;
467 }
468 *((u_int32_t *)resp->data) = priv->promisc;
469 break;
470 case NGM_ETHER_SET_PROMISC:
471 {
472 u_char want;
473
474 if (msg->header.arglen != sizeof(u_int32_t)) {
475 error = EINVAL;
476 break;
477 }
478 want = !!*((u_int32_t *)msg->data);
479 if (want ^ priv->promisc) {
480 if ((error = ifpromisc(priv->ifp, want)) != 0)
481 break;
482 priv->promisc = want;
483 }
484 break;
485 }
486 case NGM_ETHER_GET_AUTOSRC:
487 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
488 if (resp == NULL) {
489 error = ENOMEM;
490 break;
491 }
492 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
493 break;
494 case NGM_ETHER_SET_AUTOSRC:
495 if (msg->header.arglen != sizeof(u_int32_t)) {
496 error = EINVAL;
497 break;
498 }
499 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
500 break;
501 case NGM_ETHER_ADD_MULTI:
502 {
503 struct sockaddr_dl sa_dl;
504 struct ifmultiaddr *ifma;
505
506 if (msg->header.arglen != ETHER_ADDR_LEN) {
507 error = EINVAL;
508 break;
509 }
510 bzero(&sa_dl, sizeof(struct sockaddr_dl));
511 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
512 sa_dl.sdl_family = AF_LINK;
513 sa_dl.sdl_alen = ETHER_ADDR_LEN;
514 bcopy((void *)msg->data, LLADDR(&sa_dl),
515 ETHER_ADDR_LEN);
516 /*
517 * Netgraph is only permitted to join groups once
518 * via the if_addmulti() KPI, because it cannot hold
519 * struct ifmultiaddr * between calls. It may also
520 * lose a race while we check if the membership
521 * already exists.
522 */
523 IF_ADDR_LOCK(priv->ifp);
524 ifma = if_findmulti(priv->ifp,
525 (struct sockaddr *)&sa_dl);
526 IF_ADDR_UNLOCK(priv->ifp);
527 if (ifma != NULL) {
528 error = EADDRINUSE;
529 } else {
530 error = if_addmulti(priv->ifp,
531 (struct sockaddr *)&sa_dl, &ifma);
532 }
533 break;
534 }
535 case NGM_ETHER_DEL_MULTI:
536 {
537 struct sockaddr_dl sa_dl;
538
539 if (msg->header.arglen != ETHER_ADDR_LEN) {
540 error = EINVAL;
541 break;
542 }
543 bzero(&sa_dl, sizeof(struct sockaddr_dl));
544 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
545 sa_dl.sdl_family = AF_LINK;
546 sa_dl.sdl_alen = ETHER_ADDR_LEN;
547 bcopy((void *)msg->data, LLADDR(&sa_dl),
548 ETHER_ADDR_LEN);
549 error = if_delmulti(priv->ifp,
550 (struct sockaddr *)&sa_dl);
551 break;
552 }
553 case NGM_ETHER_DETACH:
554 ng_ether_detach(priv->ifp);
555 break;
556 default:
557 error = EINVAL;
558 break;
559 }
560 break;
561 default:
562 error = EINVAL;
563 break;
564 }
565 NG_RESPOND_MSG(error, node, item, resp);
566 NG_FREE_MSG(msg);
567 return (error);
568 }
569
570 /*
571 * Receive data on a hook.
572 */
573 static int
574 ng_ether_rcvdata(hook_p hook, item_p item)
575 {
576 const node_p node = NG_HOOK_NODE(hook);
577 const priv_p priv = NG_NODE_PRIVATE(node);
578 struct mbuf *m;
579
580 NGI_GET_M(item, m);
581 NG_FREE_ITEM(item);
582
583 if (hook == priv->lower || hook == priv->orphan)
584 return ng_ether_rcv_lower(node, m);
585 if (hook == priv->upper)
586 return ng_ether_rcv_upper(node, m);
587 panic("%s: weird hook", __func__);
588 #ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */
589 return (0);
590 #endif
591 }
592
593 /*
594 * Handle an mbuf received on the "lower" or "orphan" hook.
595 */
596 static int
597 ng_ether_rcv_lower(node_p node, struct mbuf *m)
598 {
599 const priv_p priv = NG_NODE_PRIVATE(node);
600 struct ifnet *const ifp = priv->ifp;
601
602 /* Check whether interface is ready for packets */
603 if (!((ifp->if_flags & IFF_UP) &&
604 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
605 NG_FREE_M(m);
606 return (ENETDOWN);
607 }
608
609 /* Make sure header is fully pulled up */
610 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
611 NG_FREE_M(m);
612 return (EINVAL);
613 }
614 if (m->m_len < sizeof(struct ether_header)
615 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
616 return (ENOBUFS);
617
618 /* Drop in the MAC address if desired */
619 if (priv->autoSrcAddr) {
620
621 /* Make the mbuf writable if it's not already */
622 if (!M_WRITABLE(m)
623 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
624 return (ENOBUFS);
625
626 /* Overwrite source MAC address */
627 bcopy(IF_LLADDR(ifp),
628 mtod(m, struct ether_header *)->ether_shost,
629 ETHER_ADDR_LEN);
630 }
631
632 /* Send it on its way */
633 return ether_output_frame(ifp, m);
634 }
635
636 /*
637 * Handle an mbuf received on the "upper" hook.
638 */
639 static int
640 ng_ether_rcv_upper(node_p node, struct mbuf *m)
641 {
642 const priv_p priv = NG_NODE_PRIVATE(node);
643 struct ifnet *ifp = priv->ifp;
644
645 /* Check length and pull off header */
646 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
647 NG_FREE_M(m);
648 return (EINVAL);
649 }
650 if (m->m_len < sizeof(struct ether_header) &&
651 (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
652 return (ENOBUFS);
653
654 m->m_pkthdr.rcvif = ifp;
655
656 /* Pass the packet to the bridge, it may come back to us */
657 if (ifp->if_bridge) {
658 BRIDGE_INPUT(ifp, m);
659 if (m == NULL)
660 return (0);
661 }
662
663 /* Route packet back in */
664 ether_demux(ifp, m);
665 return (0);
666 }
667
668 /*
669 * Shutdown node. This resets the node but does not remove it
670 * unless the REALLY_DIE flag is set.
671 */
672 static int
673 ng_ether_shutdown(node_p node)
674 {
675 const priv_p priv = NG_NODE_PRIVATE(node);
676
677 if (node->nd_flags & NGF_REALLY_DIE) {
678 /*
679 * WE came here because the ethernet card is being unloaded,
680 * so stop being persistant.
681 * Actually undo all the things we did on creation.
682 * Assume the ifp has already been freed.
683 */
684 NG_NODE_SET_PRIVATE(node, NULL);
685 FREE(priv, M_NETGRAPH);
686 NG_NODE_UNREF(node); /* free node itself */
687 return (0);
688 }
689 if (priv->promisc) { /* disable promiscuous mode */
690 (void)ifpromisc(priv->ifp, 0);
691 priv->promisc = 0;
692 }
693 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
694 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */
695
696 return (0);
697 }
698
699 /*
700 * Hook disconnection.
701 */
702 static int
703 ng_ether_disconnect(hook_p hook)
704 {
705 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
706
707 if (hook == priv->upper) {
708 priv->upper = NULL;
709 if (priv->ifp != NULL) /* restore h/w csum */
710 priv->ifp->if_hwassist = priv->hwassist;
711 } else if (hook == priv->lower)
712 priv->lower = NULL;
713 else if (hook == priv->orphan)
714 priv->orphan = NULL;
715 else
716 panic("%s: weird hook", __func__);
717 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
718 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
719 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
720 return (0);
721 }
722
723 /******************************************************************
724 INITIALIZATION
725 ******************************************************************/
726
727 /*
728 * Handle loading and unloading for this node type.
729 */
730 static int
731 ng_ether_mod_event(module_t mod, int event, void *data)
732 {
733 struct ifnet *ifp;
734 int error = 0;
735 int s;
736
737 s = splnet();
738 switch (event) {
739 case MOD_LOAD:
740
741 /* Register function hooks */
742 if (ng_ether_attach_p != NULL) {
743 error = EEXIST;
744 break;
745 }
746 ng_ether_attach_p = ng_ether_attach;
747 ng_ether_detach_p = ng_ether_detach;
748 ng_ether_output_p = ng_ether_output;
749 ng_ether_input_p = ng_ether_input;
750 ng_ether_input_orphan_p = ng_ether_input_orphan;
751 ng_ether_link_state_p = ng_ether_link_state;
752
753 /* Create nodes for any already-existing Ethernet interfaces */
754 IFNET_RLOCK();
755 TAILQ_FOREACH(ifp, &ifnet, if_link) {
756 if (ifp->if_type == IFT_ETHER
757 || ifp->if_type == IFT_L2VLAN)
758 ng_ether_attach(ifp);
759 }
760 IFNET_RUNLOCK();
761 break;
762
763 case MOD_UNLOAD:
764
765 /*
766 * Note that the base code won't try to unload us until
767 * all nodes have been removed, and that can't happen
768 * until all Ethernet interfaces are removed. In any
769 * case, we know there are no nodes left if the action
770 * is MOD_UNLOAD, so there's no need to detach any nodes.
771 */
772
773 /* Unregister function hooks */
774 ng_ether_attach_p = NULL;
775 ng_ether_detach_p = NULL;
776 ng_ether_output_p = NULL;
777 ng_ether_input_p = NULL;
778 ng_ether_input_orphan_p = NULL;
779 ng_ether_link_state_p = NULL;
780 break;
781
782 default:
783 error = EOPNOTSUPP;
784 break;
785 }
786 splx(s);
787 return (error);
788 }
789
Cache object: 6534594aa5f0e2824f2a8c443adbb0fc
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